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Influence of impurity on the work of jaw crusher

Product introduction :https://www.lvssn.com/crusher/Jaw-crusher.html

Jiangsu LVSSN company core cement epc

For the jaw crusher, although the impurity is small, but the result is large, not only will affect the quality of the finished product, but also cause the failure of the jaw crusher, so should reduce the impurities into the internal equipment, influence of impurity on the work of jaw crusher

1. Impurities will cause equipment failure

If impurities into the jaw crusher, there are a lot of comparison in hydraulic system because of its internal small aperture, if these impurities mixed with which, short time won't have what problem, but after a long period of time, the increase in the number of impurities, will cause some production problems, such as blocking oil duct, a precise accidentally strain, etc., these failures will cause the service life of equipment, and the decline in performance;

2. Impurities will cause the quality of finished products to decline

If enter the impurities in the jaw crusher, then these impurities may be blended into finished products, make product quality to drop, such as the cement mixed with impurities, so its as raw materials for the concrete production, is bound to cause the loss of the performance of concrete, at this time of the product sales price will drop, and then affects the production of comprehensive income;

3. How to prevent impurities from entering the jaw crusher

If you want to prevent impurities from entering the equipment, it is actually very easy, that is, when feeding, the first screening, the impurities can be removed, in addition, jaw crusher in use, regularly clean its hydraulic system, can also reduce the impurities caused by equipment failure; The main impact of impurities is on the quality of finished products and on equipment failure. Only by ensuring that the jaw crusher is not affected by impurities, can we bring more benefits. If you have other problems, please contact us online.

The page source: https://www.lvssn.com/Product/Influence-of-impurity-on-the-work-of-jaw-crusher.html

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What are the wear forms of jaw crusher

Product introduction :https://www.cementepc.net/crusher/Jaw-crusher.html

Jiangsu LVSSN company core cement epc

In the production process of jaw crusher, wear phenomenon is mainly due to wear and material or unreasonable operation caused by different reasons caused by different forms of wear, jaw crusher has what form of wear

1. Abrasion type wear

The wear form is mainly due to the jaw crusher and processing, the hardness of the larger the relative sliding between the material and equipment, but the acting force between them is small, hardness larger material doesn't happen broken, just slightly sliding friction pair surface, produce tiny scratches, material in the form of wear debris is a small amount of metal loss;

2. Fragmentation wear

This form of wear is mainly due to the hardness of the material in the jaw crusher by the great stress of friction, this effect exceeds the ultimate strength of the material, make it broken, at the same time make the friction pair surface pull, plastic deformation, fatigue damage or fracture, peeling caused by wear;

3. Chisel wear

The causes of the wear form of jaw crusher is mainly are broken material with larger ultimate strength, and have sharp edges, plus the friction pair of its strong stress, causing friction pair material surface under high contact stress and impact, make the material surface tear out large jaw or debris, forming deep furrows or pit; Jaw crusher wear form mainly has three kinds, respectively is abrade wear, wear and chisel cut type wear fracture type, the main wear form and material is between the impact extrusion etc, makes the equipment under complex surface contact stress, in reaction to the phenomenon, at the time of the machine use, need to be repair, maintenance, in order to improve its service life.

The page source: https://www.cementepc.net/productknowledge/What-are-the-wear-forms-of-jaw-crusher.html

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The causes and solutions of cylinder fracture of rotary kiln in operation

Product introduction:https://www.cementepc.net/burning/Rotary-kiln.html

Jiangsu LVSSN company core cement epc

In normal operation of rotary kiln, the overall strength of cement rotary kiln is low, which is easy to cause the fracture of rotary kiln barrel,the causes and solutions of cylinder fracture of rotary kiln in operation

1. Fracture reason of rotary kiln barrel

1.1 high temperature condition

In the high temperature condition of the rotary kiln, some materials may age, thus forming the cylinder of the rotary kiln to appear fracture.

1.2 human factors

It may be the man-made factors, mainly the unscientific maintenance leads to the fracture of the rotary kiln barrel.

1.3 transportation problems

Another possibility is that in the process of transportation and installation of rotary kiln equipment, the cylinder of rotary kiln presents potential cracks due to collision and other reasons. Then, with the increase of load in operation, the potential cracks on the cylinder will expand, leading to the appearance of cracks.

2. Fracture solution of rotary kiln barrel

1.1 transfer to rotary kiln belt

Move the belt of rotary kiln, remove the local firebrick, then polish the crack welding, and then restore the original position in turn.

1.2 withdrawal of refractory bricks from rotary kiln

The refractory bricks of rotary kiln are removed, welded solid by argon arc welding from the inside, and then polished from the inside. Even if the rotary kiln barrel is fractured during operation, only when we have mastered the correct treatment methods can we quickly solve the problems in production and ensure the safety of production and personnel by understanding the causes of various fractures.

The page source:https://www.cementepc.net/company/The-causes-and-solutions-of-cylinder-fracture-of-rotary-kiln-in-operation.html

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Cooperative treatment of solid waste plays an important role in cement kiln

Product introduction:https://www.cementepc.net/productknowledge/Cooperative-treatment-of-solid-waste-plays-an-important-role-in-cement-kiln.html

Cement system design and system development is closely related to the use of various raw materials, fuel properties, because the cement system is containing "three against" the thermal system, so whether the thermal system of single equipment such as various preheater design scheme is determined, or "tube, pipe, kiln and furnace," such as the determination of the whole design scheme of firing system, all need according to the using conditions of the original fuel targeted design.Cooperative treatment of solid waste plays an important role in cement kiln

1. Design of different cement kilns

Therefore, for each project, the process design of cement kiln is not invariable and needs to be personalized according to different raw fuel conditions, especially for collaborative disposal of solid waste by cement kiln, and targeted optimization design must be carried out according to specific characteristics of collaborative disposal of solid waste by cement kiln

2. Transformation of cement kiln

For a new cement kiln production line for collaborative solid waste disposal project, optimization design can make the project meet the requirements of collaborative solid waste disposal of cement kiln after construction, meet the standards and reach production as soon as possible, and achieve the expected results.To the original cement kiln production line for the use of solid waste for coordination of projects, optimization design is based on the analysis of the original system of cement kiln of diagnosis put forward technical transformation of the original cement kiln system design scheme, and organize the implementation, make regular cement kiln can be adapted to the requirements of cement kiln for coordination to achieve the expected purpose.

Therefore, process optimization design is very important for both new construction projects and technical transformation with the original cement kilns, which is the premise for the smooth implementation of collaborative disposal of cement kilns.Especially for the collaborative disposal of solid waste with the original cement kiln, the process optimization design and technical transformation are complementary and closely unified.

The page source:https://www.cementepc.net/productknowledge/Cooperative-treatment-of-solid-waste-plays-an-important-role-in-cement-kiln.html

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Key points of rotary kiln maintenance

Product introduction:https://www.cementepc.net/burning/Rotary-kiln.html

Safe operation during daily operation of rotary kiln can greatly reduce the occurrence of equipment fault accidents, extend the service life and safe operation cycle of rotary kiln, slow down the damage of refractory materials, reduce the consumption of power and auxiliary materials.

Safe operation of rotary kiln includes correct execution of operating procedures, regular maintenance and repair.Therefore, high attention should be paid to the operation and maintenance of rotary kiln, and its safety operation matters needing attention are as follows:

1. Strictly abide by the technical operation rules of rotary kiln and strictly control the technological parameters of rotary kiln. 2. Hang the high temperature warning board to remind you not to touch the high temperature parts to prevent scalding. 3. When working around the rotary kiln, you must wear labor protection products (work clothes, hard hat, dust cap, mask, goggles, gloves, labor protection shoes, safety belt, etc.).Short-sleeved shirts and chemical-fiber work clothes are prohibited. Work clothes should be tightly wound to prevent rotating parts of the machine from strangling corners and sleeves and causing accidents. 4. When passing through the observation hole of rotary kiln, wear the fireproof mask and leather gloves. Direct viewing is not allowed.When the observation hole is not used, the observation hole should be closed.Non - workers should leave the kiln head platform to prevent the high temperature smoke ejecting injury.

5. During operation, do not touch the bearing, reducer or the interior of the big gear housing with hands or other things. Wear safety protection equipment when carrying out maintenance inspection or cleaning. 6. Check whether the contact and wear between the roller and the supporting wheel and the retaining wheel are even, whether there is uneven force or pitting phenomenon.Every 4 hours, check the reducer for abnormal sound and noise. 7. Check the outlet gas and discharge temperature frequently, so as to avoid overheating of the cylinder body and avoid the phenomenon of local burning of the cylinder body. 8. The operation of the feeding machine should be delicate and steady to prevent the shaking of large movements. 9. The kiln speed of rotary kiln should be controlled and stable. Stable feed and kiln speed are very important.The initial feed quantity and kiln speed of the new kiln should be controlled at about 35% of the design value.The speed of kiln increases with the increase of feeding amount.When the system is running normally, the kiln speed should be controlled at 3.0r/min.

10. It is strictly prohibited to stop kiln baking to avoid serious collapse accidents caused by "hot bending" caused by temperature difference between upper and lower parts of the cylinder. Before stopping the kiln, stop the hot air supply first, and then stop feeding.Only when the exhaust gas temperature is below 50℃ and the sludge in the rotary kiln is cleaned can the kiln be stopped. If the rotary kiln is suddenly cut off due to other reasons, the rotary kiln must be turned by winch or manually rotating cylinder every 15 minutes for 1/4 turn, and the interval time can be increased appropriately after 3 hours.The hot air supply should be stopped when the kiln is stopped to avoid bending the cylinder body. 11. Repair work shall be carried out after listening to the kiln, and a "do not start" sign shall be hung on the motor switch. 12. Do not tie the cloth to the hand or wipe the appearance of the machine with your fingers near the rotating parts. Be careful not to wrap the material around the rotating parts, especially on the supporting wheels.

The page source:https://www.cementepc.net/Industry/Key-points-of-rotary-kiln-maintenance.html

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How to choose the proper equipment for calcining active lime?

Product introduction:https://www.lvssn.com/bruning/Lime-rotary-kiln.html

Active lime with high activity and added value is widely used and has a broad market prospect.In recent years, the exploitation of limestone resources, as the raw material of active lime, has been greatly tightened. Limestone resources will officially enter the era of scarcity.How to choose the proper equipment for calcining active lime?

1. Limestone calcination equipment

Calcination is a key process in the production of active lime, the choice of calcination equipment is very important, the choice of limestone rotary kiln has an important impact on the full use of limestone resources.Generally, 0-30mm fine grain limestone accounts for 30-40% of the total output of mine products. If not fully utilized, limestone resources will be seriously wasted.

2. Calcining in rotary kiln

At present, different calcination equipment of active lime USES different limestone particle size.The rotary kiln can calcine 10-50mm fine grain limestone directly, so that most of the limestone below 40mm can be utilized, and a large amount of mining costs can be saved every year, and the mining life of the mine can be extended.Therefore, calcining active lime in rotary kiln has a good advantage and a good prospect in making full use of limestone resources and energy.

3. Rotary kiln production process

The main characteristics of the rotary kiln production process are that the rotary kiln calcined limestone with the vertical preheater and the vertical cooler to meet the production requirements of energy saving, environmental protection and good activity. We can only choose the right limestone rotary kiln to increase the output and bring the maximum benefit. If you don't know how to choose the rotary kiln, you can contact our online customer service.

The page source:https://www.lvssn.com/Industry/How-to-choose-the-proper-equipment-for-calcining-active-lime.html

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Jaw crusher hydraulic cylinder piston rod frequent fracture solution

Product introduction:https://www.cementepc.net/crusher/Jaw-crusher.html

Jaw crusher is an important coarse breaking equipment in cement, mining, metallurgy and other industries.Jaw crusher mainly has eccentric shaft, belt wheel, frame, flywheel and reset spring, bracket, fixed jaw plate and movable jaw plate and other important parts.The working environment is bad and various faults often occur during the operation. In order to ensure the stable operation of the equipment and improve the performance of the equipment, it is very important to do a good job in daily maintenance.Piston rod fracture occurs in the process of jaw breaking. Through the analysis of the causes of this problem, The solution of frequent fracture of piston rod of hydraulic cylinder of jaw crusher is presented.

1. Analysis of existing problems and causes

The main function of this hydraulic cylinder is to connect the moving jaw and the frame, so as to ensure the contact between the bracket and the moving jaw and the frame during the operation of the jaw crusher, and control the backstroke position of the moving jaw to prevent the dropping of the bracket. When the piston rod is hinged at both ends of the hydraulic cylinder, the diameter of the piston rod is 63mm and the working pressure is 13 ~ 16MPa, the actual tensile stress of the piston rod of this type of hydraulic cylinder is less than the allowable tensile stress, which indicates that there is no problem in the selection of materials, piston rod diameter and other aspects in the design.Combined with the analysis of the phenomenon of the fracture end face on site, the fracture face is neat and there is no shrinkage along the axial section, which also indicates that the main cause of the piston rod fracture is not caused by tensile stress. The next step is to verify the existence of design defects from the structural aspect.Observation shows that the two faults are almost the same.The piston rod and earring were originally designed to be structurally separated, and the two parts were connected with a threaded structure.The thread size is M56 and the piston rod diameter is 63mm. The thread is located at one end of the piston rod.At the joint of the round rod and thread, there is a section step, and the diameter is reduced from 63mm to 56mm.This point is extremely close to the movable jaw hinge, which is a dangerous point where all kinds of stresses cross converge. At the same time, the original design to increase the wear resistance of the hydraulic cylinder, technical requirements only on the piston rod hardness requirements, and the strength of no provisions, resulting in the piston rod hardness increased, the corresponding strength may be affected, so that the piston rod brittleness increases, can not resist shear stress and other aspects of interference.These two factors lead to the use of the piston rod in this part of the fracture.

2. Structure improvement of jaw crusher

(1) improved the design concept, forged piston rod and earring into one, combined with a large round corner transition, cancel the screw connection, reduce the stress concentration. (2) increase the diameter of piston rod to increase the resistance to comprehensive stress. (3) at the same time, change the heat treatment requirements, increase the strength requirements, so that the piston rod hardness and strength to achieve consistency.

3. Improved effect

By improving the structure of piston rod fracture, the performance is stable, the hydraulic cylinder has no problems within one year after the transformation, and the production efficiency has been improved. We also need to overhaul the improved jaw crusher according to the requirements. Minor repairs shall be made within half a month to a month according to the overall operation of the machine. Minor repairs shall be made once a year according to the overall wear of the machine.Good maintenance work to ensure the normal operation of equipment.

The page source:https://www.cementepc.net/Industry/Jaw-crusher-hydraulic-cylinder-piston-rod-frequent-fracture-solution.html

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What solution does cone crusher have too often iron?

Product introduction:https://www.lvssn.com/crusher/Cone-crusher.html

Cone crusher is mainly used for crushing various high hardness materials, suitable for medium and fine crushing operations.Because of excessive iron in the process of use, the cone crusher suffers different degrees of damage to key spare parts such as the frame, spindle and eccentric copper sleeve, which brings great difficulties to production and increases the labor intensity of maintenance workers.What solution does cone crusher have too often iron?

1. The harm of over iron to crusher

Due to the different sizes of iron pieces, the parameters of the cone crusher change accordingly. When the parameters are abnormal, damage will be caused to different parts of the crusher body and other weak links. The harm of iron overpass to the cone crusher mainly includes the following aspects:

(1) changes of parameters of the cone crusher after iron feeding

When the cone crusher into the iron, the iron is hard, unable to break, stuck between moving, fixed cone lining plate, in the attempt to break the instantaneous pressure instantaneous rise, power is also increased, oil temperature rise high;The crusher detected an iron entry into the crusher.Then the crusher will reduce the pressure, reduce the spindle, increase the ore outlet, iron discharge, to prevent the damage of the cone crusher expansion.But in this process the damage to the crusher is very large.

(2) damage of all kinds of bushing

When the crushing chamber enters the iron, the hydraulic oil pressure that holds the spindle rises instantaneously and then decreases, and the spindle tilts at the same time when it falls, resulting in the heat burn of the thrust bearing.Moreover, when the spindle tilts, the oil film between the spindle and the eccentric copper sheath will be damaged, resulting in burns, check the metal chips of the oil filter, and even cause deformation and failure of the eccentric bush, the bush of the lower frame and other spare parts, causing the cone crusher to stop and disassemble for maintenance.

(3) excessive wear of wearing parts

When crushing cavity into the iron piece, if iron size is greater than the crusher row ore mouth, get stuck between the dynamic and fixed cone plate, into the iron makes the moving cone plate and fixed cone plate form rigid collision, lead to loose lining board or cracking, moving and fixed cone plate and arm bushing parts, such as excessive wear, seriously affect the normal use of parts, cycle, at the same time due to the fall in the spindle tore his arm in the process of oil seal, caused by the leakage of lubricating grease.

(4) the safety coupling shaft is locked

The safety coupling includes a hydraulic torque setting system.By adjusting the hydraulic pressure to release the torque, the required limit can be set.When the pre-set torque is exceeded, the safety coupling is released and the top of the shear tube is cut off by the shear ring, releasing the oil pressure in the coupling and allowing the coupling to rotate freely on the shaft.For design reasons, the safety coupling has a limited capacity to absorb other types of loads.For example, yield torque and radial torque, for this reason, the safety coupling cannot absorb the adjustment defect.When the cone crusher cavity suddenly appear hard objects (especially large iron), the coupling will bear the torque will exceed its limit, resulting in the coupling locked.

(5) excessive iron for a long time frequently causes spindle fracture and frame cracking

When the cone crusher chamber into the iron, uneven due to the impact force and the hydraulic oil pressure changes are in the next frame body and the spindle, and due to frequent a iron frame, main shaft fatigue, eventually make the crack of frame body return chute place, should be returned to the factory repair, repair many times lead to failure of scrapped, main shaft rupture scrap.

2. Solutions to prevent over-iron

To prevent the cone crusher from too much iron, mainly from the following three aspects:

(1) strengthen the spot inspection of wear of the belt funnel lining plate, and replace it in time if any problem is found, so as to prevent it from falling off and entering into the cone crusher. (2) install a metal detector on the feeding belt of the cone crusher and pick up the iron parts of the belt system into the crusher to avoid damage. (3) install an electronic pressure relief valve on the cone crusher. When the iron pieces enter the crusher and the pressure increases, immediately open the pressure relief valve to drain oil, lower the spindle and discharge the iron pieces. When the cone crusher occurs due to over-iron or other fault, should be timely analysis and judgment of the fault, accurately find out the cause of the fault, and take effective measures to ensure the continuous and stable operation of the equipment, ensure the orderly production.

The page source:https://www.lvssn.com/Industry/What-solution-does-cone-crusher-have-too-often-iron.html

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What are the common faults of roll crusher?

Product introduction:https://www.cementepc.net/crusher/Roll-crusher.html

Roll crusher used for coarse, intermediate crushing of materials, to ensure the output, first to ensure the normal operation of the roll crusher, do you know what are the common faults of roll crusher?

1. Poor discharge particle size

We all know to roll crusher is by extrusion between two rollers to the broken material, so in the case of uneven in discharging granularity, the first thing we should check whether the roller leather wear, like skin uneven wear and tear, and found that roll to roll for surfacing welding on flat, if wear is extremely serious, recommend replacing roll leather.

2. Abnormal sound or abnormal equipment vibration occurs in the crushing chamber

If the roller crusher in the work of abnormal vibration, may be the feed size is too large, or feeding uneven, should control the size of the feed does not exceed the specified value, and ensure uniform feed.It is also necessary to check whether the roller broken bolts are loose, especially the anchor bolts and bearing bolts should be tightened. If found at work for roller broken broken cavity internal sound, first of all should be ruled out is not broken material into the crushing chamber internal, should stop to crushing cavity clean, if found no abnormal gouge, there may be a crushing cavity internal component damage fracture, the corresponding damaged parts for replacement.

3. The bearing temperature is too high in the working process

Bearing is an important part to drive a roll breaking work, so we should pay attention to the bearing temperature during the work. If the bearing temperature is too high during the work, it may be the usual lubrication work is not in place, or the quality of the lubricating oil used is not guaranteed.If the bearing is damaged due to long-term use, it should be replaced in time, otherwise it will cause more serious consequences.

4.The machine works but the rolls don't roll

If after starting up the roller crusher, it is found that the transmission part is working but the roller is not moving,check whether the triangle belt is too loose and slipping, adjust the tension of the triangle belt, check whether the bearing is damaged, if so, replace it in time.Or if there is any damage to the long-tooth gear, if it is found to be the reason for the gear, stop the machine to replace the gear.

5. Boring machine

The biggest cause of roller crushing machine is to feed too much, which leads to the crusher overload caused by, should immediately stop feeding, empty the crushing cavity, find out the reason for the correct treatment. Only when we understand the common faults of roller crushing, can we timely eliminate unexpected accidents in production and ensure the efficiency and profit of production.

The page source:https://www.cementepc.net/company/What-are-the-common-faults-of-roll-crusher.html

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How should ball mill gear wear and tear be handled?

Product introduction:https://www.lvssn.com/mill/Cement-ball-mill.html

Ball mill is a very important equipment selection plant, but also the entire selection plant investment accounted for a large proportion of equipment, in the use of the process to ensure the service life of the ball mill, first to ensure the life of the gear, because the gear is to achieve the ball mill transmission operation and power of the mechanical components.Once the gear is damaged, waiting for the ball mill is closed for repair.How should ball mill gear wear and tear be handled?

1. Features of gear transmission of ball mill

1.1, structure,

Ball mill gear drive is a half-open gear drive, small gear in the left or right lower part of the big gear, through the transmission shaft support in the transmission seat.The mounting Angle of the gear pair (the Angle between the center line of the gear and the horizontal line) is generally about 20°.Big gear has a whole and two open structure, gear tooth arrangement has straight teeth, oblique teeth and herringbone teeth 3 kinds.In order to prevent dust and lubricating oil spatter, the gear pair is equipped with a relatively complete protective cover.

1.2,Working condition of ,

Ball mill gear transmission has the disadvantages of high transmission power, low speed, heavy load starting, impact load and easy to enter dust or even pulp.

2. Causes and treatment of gear wear

2.1 improper selection and use of lubricating oil cause wear of ball mill gears

The choice of lubricating oil and lubrication mode is an important means to ensure the normal operation of the ball mill gear, but also a necessary condition to reduce noise and wear. In the concentrator, the technical personnel choose the ball mill gear lubrication at will, and do not choose to use it according to the different characteristics and effects of different lubricants, and do not choose the correct lubricants according to the actual use situation on the site.This will lead to the ball mill gear in the process of operation of insufficient viscosity of lubricating oil, can not effectively form a protective oil film, resulting in wear ball mill gear.In addition, there are a few factories in the use of lubricating oil in the process of shoddy, with abandoned diesel as lubricating oil, not only can not play a role in lubrication, but also accelerate the wear of the ball mill.

Solution to wear of ball mill gear caused by lubricating oil:

When choosing lubricating oil, two aspects need to be paid attention to.On the one hand is lubricating oil viscosity, on the other hand is lubricating oil. When selecting the lubrication method, it is necessary to ensure that the lubrication method is reasonable and comprehensive.At present, the common lubrication methods of ball mill gear include manual lubrication, oil pool lubrication, drip lubrication and spray lubrication.Compared with other lubrication methods, spray lubrication system has better lubrication efficiency and can form a stable oil film.

2.2 poor sealing performance of transmission gear section

The size of the transmission gear of the ball mill is generally large, so the sealing device is needed to ensure the sealing performance between the gears of the ball mill.

But in the existing processing technology, a lot of ball mill in the cross section of the gear processing technology is facing pressure method, the process to produce the gear used in prophase effect is very good, sealed performance is good, but after running for a period of time, face felt by extrusion can lead to elastic felt lost its potency, and sealing performance of the gear failure. Failure of the sealing device will let more dust and impurities into the gear, long-term operation, and serious wear gear surface, not only service life will be greatly reduced, but also affect the subsequent maintenance and installation operations.

Solution to wear caused by sealing of gear section:

In order to ensure the sealing property of the ball mill gear, the precision and hardness of the gear can only be enhanced in the production and processing of the ball mill gear.The tooth surface roughness is 3.2 microns, which is difficult to meet the long-term work accuracy and roughness, so daily inspection, regular maintenance, or the use of more accurate ball mill gear. The above is only caused the ball mill gear wear part of the reason, in fact, to effectively reduce the wear of the ball mill gear is not difficult, as long as remember the three points: a strict accordance with the provisions and ball mill use instructions, two daily maintenance maintenance can not be less, three ball mill choice to be correct.

The page source:https://www.lvssn.com/company/How-should-ball-mill-gear-wear-and-tear-be-handled.html

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What are the details of cleaning the crusher?

Product introduction:https://www.cementepc.net/crusher/crusher.html

As a commonly used crushing equipment, many customers do not pay much attention to the cleaning of the crusher when using it. However, if the crusher is not cleaned for a long time, it will affect the operation of the equipment. Therefore, cleaning is also an important part of the maintenance of the crusher.what details need to pay attention to clean the crusher?

1. Clean the crusher belt

Check the belt and pulley for oil stains, and if so, wipe the belt and pulley with a clean cloth without leaving any stains or dust.

2. Clean the inlet and outlet of the crusher

Check the inlet and outlet to see if there is any residual material of the crusher during the last operation. If there is, it should be processed in time to ensure the cleanliness and cleanliness of the outlet and inlet, otherwise it may affect the quality of finished products.

3. Clean the inside of the crushing chamber

Check if there are any other debris in the crushing chamber of the crusher. Please note that the power should be disconnected before cleaning.When opening the inside of the crushing chamber, first clean the surrounding residual materials, and then clean the residual materials on the hammer head;Because the lining board is arranged in the crushing chamber, when selecting the rotary cutter disc, the metal material will wear off some paint on the lining board, so we also need to check whether there are impurities and paint on the inner wall of the crushing chamber;When cleaning, we need to use towel, brush and other cleaning tools to clean. After cleaning the materials in the equipment, wipe and clean with 75% ethanol, and then close the crushing chamber.The cleaning of crushing chamber should be carried out before starting up the equipment to reduce the load during starting up.

4. Clean the outside of the crusher

For the outside of the crusher cleaning, mainly the shell surface cleaning and the surface cleaning.Sand machine cleaning work is mainly to prevent the emergence of crusher block material and other problems, to ensure the normal operation of the crusher.

5. Clean the bearing of the crusher

In addition to the above parts, but also on the equipment to clean up the bearing, bearing on if there are any attachments will make bearing heat affected, the cooling effect of variation leads to bearing temperature rise, will affect the life of equipment and performance, serious word will cause equipment accident and safety problems, so if you find there are attachments on bearing should be clear in time, sand attached objects of a class is the same, to ensure that the bearing can be smooth and stable running. Crusher cleaning work needs to have a person to be responsible for the cleaning of the equipment for an arrangement, there are planning and step-by-step implementation.Crusher maintenance must carry out the principle of "maintenance and repair, prevention first", do regular maintenance, mandatory, correct handling of the use, maintenance and repair of the relationship.

The page source:https://www.cementepc.net/company/What-are-the-details-of-cleaning-the-crusher.html

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Conical crushing oil high temperature treatment measures

Product introduction:https://www.lvssn.com/crusher/Cone-crusher.html

During the fine crushing production of cone crusher, the problem of high lubricating oil temperature occurred. Even when the fan cooler was running, the oil temperature was still higher than 50℃ (the operating temperature was better kept within the range of 38-46℃), and the pressure was lower than 140kPa. What were the reasons for the excessive lubricating oil temperature of cone crusher?Conical crushing oil high temperature treatment measures.

1. The lubricating oil in the oil tank is dirty and the service time is too long.

The replacement cycle of lubricating oil is 2000h, if it exceeds 2000h, the viscosity of lubricating oil and other indicators will be seriously reduced, too many impurities in the oil will cause a decline in the quality of lubrication, will also cause wear on the inside of the crusher, resulting in the crusher overheating, lubricating oil return oil temperature is too high. Solution to lubricating oil contamination: In this regard, lubricating oil and lubricating oil filter core should be replaced immediately, and the oil tank should be cleaned. The service life of lubricating oil should be determined (should not exceed 2000h), and the lubricating oil should be replaced at the same time when 6 sets of liner are replaced (the service life of liner is about 300h).In addition, it is also necessary to check and clean the impurities on the filter screen in the lubricating oil box, and decide whether to carry out further maintenance according to the filter screen impurities.

2. The blower is not operating normally and the air filter is not replaced in time.

The role of the blower is to introduce air into the crusher, so that the crusher internal pressure, reduce dust into the crusher internal bearing and lubricating oil.The blower of the user's cone crusher is started at the same time as the lubricating oil pump, that is, when the lubricating pump is started, the blower will start automatically. If the blower is not started, relevant technical personnel should be immediately arranged to deal with it. Solution to abnormal blower operation: When the blower starts, the corresponding computer operation interface shows green, and when it stops, it shows red. The operator can determine the operation of the blower according to this, so as to timely arrange maintenance.In addition, the air filter element should be replaced in time according to the underground air quality, usually once every 2 months.

3. The counterweight protection plate is severely worn.

The wear of ore particles will cause wear to the U - shaped oil seal and the T - shaped oil seal of the crusher.The damage of the two oil seals will first lead to the leakage of lubricating oil, and then cause the ore powder particles into the lubrication system, making the lubricating oil dirty, a long time will cause the wear of the internal parts of the crusher, resulting in abnormal temperature rise of the crusher. Solution to serious wear of counterweight protection plate: Every time, replace the liner should check dynamic cone T oil seal, found, should be replaced in a timely manner, every month should arrange related technical personnel to enter into cone crusher lower guard plate of balancing check, if it is found that weight heavily damaged guard board, should be tapered, changing the counterweight plate, U should check the host at the same time frame abrasion of oil seal, when it is necessary to replace oil seal.

4. Irregular contact surface and serious wear of components.

The contact surface between the moving cone and the spherical tile, the upper and lower bushings of the moving cone, and the eccentric shaft bushings are badly worn.In addition, the upper and lower bushings of the moving cone are respectively matched with the bowl bearing bracket and the eccentric shaft bush, and the eccentric shaft bush is matched with the spindle. If there is point contact and the contact surface is irregular, serious wear and other phenomena, it is easy to cause the crusher overheating, resulting in high oil temperature rise, serious copper sleeve burning or even spindle wear accidents.Therefore, when the upper and lower bushings of moving cone or eccentric shaft bushings appear the above phenomenon, it is necessary to conduct grinding treatment, if the wear is serious, the corresponding bushings should be replaced in a timely manner. The common reasons for the high temperature of lubricating oil of cone crusher mainly include the above points: the lubricating oil in the oil tank is dirty, the use time is too long;The blower is not working normally and the air filter element is not replaced in time.The counterweight protection plate is worn seriously, so as to effectively control the oil temperature by taking targeted measures to ensure the safe and stable operation of the equipment.

The page source:https://www.lvssn.com/company/Conical-crushing-oil-high-temperature-treatment-measures.html

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What should be done when rotary kiln occurs red kiln and refractory brick falls?

Product introduction:https://www.cementepc.net/burning/Rotary-kiln.html

The rotary kiln may break down due to various reasons in operation, among which the most common fault is the red kiln and firebrick falling off. What should be done when the red kiln and firebrick falling off the rotary kiln?

1. Red kiln treatment measures

1.1 red kiln is more harmful adhere to the principle of red kiln must stop, strictly prohibit pressing.

The erythema of the

rotary kiln

barrel body is dark red and appears in the area with the kiln skin, which is generally caused by the exposure of the kiln skin caving refractories.This kind of situation, need not stop kiln, but must make some adjustments, such as change the shape of the flame, avoid high temperature area is located in the red kiln, appropriate to speed up the kiln speed, position and aim the cooling fan is concentrated red kiln, the kiln kiln shell temperature decrease as soon as possible, such as the temperature is higher, should also be appropriate to reduce kiln head feed coal, reduce the calcination temperature.In a word, all necessary measures should be taken to repair and hang the kiln skin, so as to eliminate the erythema of the kiln barrel.

Lupus is bright red, or erythema appear in the absence of kiln area, this red kiln is commonly caused by kiln lining falls off, this must stop kiln, kiln method is to reduce coal pause to burn, and let the kiln owners drive slow turning a certain time, at the same time the kiln cylinder cooling fan position, focus on red kiln kiln shell temperature drop as soon as possible, for lupus from light red to dark red, by the auxiliary transmission turning kiln, and make red kiln location markers, to be prepared for the kiln maintenance.

Red kiln can be observed through infrared scanning temperature curve and its position can be accurately judged. The specific degree of red kiln needs to be observed and implemented on site.Generally speaking, when the peak value of the infrared scanning temperature and position curve of the rotary kiln barrel is greater than 350℃, more attention should be paid to control the temperature of the rotary kiln barrel as far as possible below 350℃.

1.2 there are two types of red kiln: brick kiln and brick kiln. Special attention should be paid to the red kiln at the belt.

There are brick red kiln, it is to point to the brick is thinner kiln skin and off, high surface temperature of refractory brick leads to high temperature of rotary kiln cylinder.When this phenomenon occurs, the kiln skin can be repaired only when the clinker quality is qualified by cooling with a fan in time to stabilize the kiln skin, because only when the clinker reaches a certain temperature can the appropriate liquid phase be available, which is conducive to the repair and hanging of the kiln skin.When high temperature occurs in the cylinder of rotary kiln, the laboratory should prepare the ingredients well to ensure the stability of the components. The clinker KH and SM should not be too high. The liquid phase of clinker should be controlled 26-27% and kh0.89-0.90 sm2.4-2.45.

2. Firebrick drop treatment measures

Drop brick red kiln, because firebrick falls, the cylinder body bright red hair white, the temperature reaches 500℃ above or even higher.When this situation occurs, immediately stop the fire of the material kiln head, stop the pressure grate cooler of 506 fan, the kiln speed drops to 0.4 RPM, and slowly cool down. When the temperature of the rotary kiln cylinder drops and no red is seen, stop the main transfer, hanging and auxiliary transfer to the kiln slowly, and gradually cool the kiln for maintenance and replacement of firebrick.In the process of operation, pay attention to the monitoring of the red kiln area, there should be no large area of refractory brick collapse phenomenon, there should be no positive pressure when the wind pressure.

The page source:https://www.cementepc.net/company/What-should-be-done-when-rotary-kiln-occurs-red-kiln-and-refractory-brick-falls.html

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How to crack the flywheel of jaw crusher?

Product introduction:https://www.lvssn.com/crusher/Jaw-crusher.html

The flywheel and groove wheel of jaw crusher are respectively installed on both sides of the eccentric shaft. The main function of flywheel is to balance the weight of the groove wheel, and the second function is to store energy.How to crack the flywheel of jaw crusher?

1. There are three main reasons for crack of jaw crusher

(1) material problem

The flywheel and belt wheel of jaw crusher are generally made of grey cast iron because of its low cost and easy processing.But the shortcoming of gray cast iron is brittleness is bigger, mechanical property is poor, suffer external force to produce crack easily.

(2) operating conditions

Affected by the mining process, into the crusher ore block is larger, easy to occur jaw crusher or ore boring machine phenomenon, sometimes have to deal with explosives, which is inevitable to jaw crusher or even flywheel impact, a long time will appear crack.

(3) design and manufacturing process

The crack is at the transition point of the round corner of casting, the wall thickness gap is large, and the round corner of the transition is small.The selection of casting round corner is not suitable, which results in shrinkage cavity and crack and stress concentration.All of the above problems will gradually appear during the operation due to the stress problem and cracks will appear.

2. Measures to deal with cracks in the flywheel of jaw crusher

If production is tight and there is no spare flywheel on site, it can only be temporarily handled to gain casting time and meet production needs.For two different kinds of flywheel: spokes and spokes, different treatment measures are taken, and the service life after treatment is also different.

21. Spoke flywheel crack

For the cracks of spoke flywheel, repair welding is generally adopted, which has the advantage of gaining casting time for spare parts and temporarily maintaining production.Defect is due to the poor welding performance of gray cast iron, due to insufficient on-site insulation measures, and affected by the level of welding, often appear in the welding process cracking, even after the welding, the service life is still not long, generally in 3-6 months after the jaw crusher flywheel will crack again.

2.2 spoke flywheel

For spoke - plate flywheel, welding repair is also used in the initial stage to maintain production temporarily.If the crack is longer than the circumference of the length of 1/2, and has been cracked, must first groove, and then repair welding.However, stress deformation may occur to the flywheel after repair welding, resulting in uneven operation of the flywheel and affecting the normal operation of the equipment. Due to the bad working environment and medium conditions, there will be some problems in the use of jaw crusher.Flywheel cracks are often treated by welding repair method. Although the performance of flywheel cannot be completely restored, it can be restored to production in a short time.However, if the crack appears again, it will be discarded, which is also a point that users need to pay attention to.

The page source:https://www.lvssn.com/Product/How-to-crack-the-flywheel-of-jaw-crusher.html

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Belt conveyor conveyor belt slip how to do?

Product introduction:https://www.cementepc.net/parts/Belt-conveyor-roller.html

Skidding is one of the common faults of the belt conveyor. Once the skidding fault occurs, it is easy to cause the material scattering, the clogging of the feeding pipe, the wear and tear of the conveyor belt, and the belt breaking, leading to the failure of the belt conveyor to operate normally.Today with you to understand the belt conveyor conveyor belt slip how to do?

1. Insufficient tension of conveyor belt

When the conveyor belt does not have enough tension, there will not be enough friction driving force between the driving wheel and the conveyor belt, so that the conveyor belt and the load cannot be pulled.The stroke of screw or hydraulic tensioning device is not enough or is not adjusted properly, the weight of heavy hammer tensioning and truck tensioning device is not enough, and the mechanism is jammed, which will cause insufficient tension of the belt conveyor and cause slipping.

Solution:

(1) the belt conveyor with screw or hydraulic tension structure can increase the tension force by adjusting the tension stroke. (2) the belt conveyor with heavy hammer tensioning and trolley tensioning structure can be processed by increasing the counterweight weight or eliminating the mechanism jam.When increasing the configuration of the tensioning device, add to the conveyor belt without slipping, should not add too much, so as not to make the conveyor belt bear unnecessary excessive tension and reduce the service life.

2. The driving drum has serious adhesive wear

After the belt conveyor runs for a long time, the rubber surface of the driving drum and its groove will be seriously worn, resulting in the reduction of friction coefficient on the surface of the driving drum and the decrease of friction force, causing the conveyor belt to slip.

Solution:

Should take the method of re-packaging or replace the drum, daily attention should be paid to the driving drum packaging inspection.

3. The conveyor belt has attachments on the non-working surface

Due to the change of natural environment, field ground washing, equipment maintenance and other reasons, the attachments that have a certain lubrication effect on the non-working face of the conveyor belt will accumulate on the surface of the driving roller during operation, causing the friction between the roller and the conveyor belt to be significantly reduced, causing hydroplane slip.

Solution:

The source of the fixtures should be determined and the source cut off.If the source cannot be cut off, sprinkle some rosin powder on the drum (blow in with the air blowing device).

4. Overload of belt conveyor

Due to improper operation or heavy load shutdown, the belt conveyor carries too much load during operation, causing the conveyor belt to slip.

Solution:

(1) observe the current of the belt conveyor and the electronic conveyor belt scale, control the amount of materials, and avoid overloading operation. (2) try to avoid overload shutdown and overload.

5. The envelop Angle or friction coefficient between the driving wheel and the conveyor belt is too small

Normally, the envelop Angle between the driving wheel and the conveyor belt should be no less than 120°, which is too small to cause slipping.If the friction coefficient between the driving wheel and the conveyor belt is too small, the conveyor belt will slip.

Solution:

When the enveloping Angle between the driving wheel and the conveyor belt is low and the position of the adjusting tension wheel is still effectively increased, the design should be modified.If the friction coefficient is too small, carefully observe whether the surface of the driving wheel of the conveyor is too smooth, or use knurling structure or inlay a layer of rubber before the test. Skidding is one of the common faults of the belt conveyor, we need to standardize the operation, carefully check and maintain to avoid the occurrence of skidding, so as to ensure the safe and stable operation of the belt conveyor system.

The page source:https://www.cementepc.net/company/Belt-conveyor-conveyor-belt-slip-how-to-do.html

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How can the service life of jaw crusher be prolonged

Product introduction:https://www.lvssn.com/crusher/Jaw-crusher.html

In the daily use of jaw crusher, wear and tear is inevitable, reduce the wear and tear, not only can improve production efficiency, but also improve economic benefits, how to prolong the service life of jaw crusher?

1. Working principle of jaw crusher

Jaw crusher works for dynamic JiYaXing, its working principle is: motor drive belt and pulley, make through eccentric shaft dynamic jaw movement up and down, when moving jaw rises between the bracket and fixed jaw Angle, so as to promote dynamic jaw plate to the fixed jaw close, rather than the material being crushed or broken at the same time, achieve the purpose of broken;When the moving jaw goes down, the Angle between the bracket plate and the moving jaw becomes smaller. Under the action of the pull rod and spring, the moving jaw plate leaves the fixed jaw plate, and at this time, the broken materials are discharged from the lower mouth of the crushing cavity.With the continuous rotation of the motor, the crushing motor jaw is used for periodic movement to crush and discharge materials, so as to realize mass production.

2. The shaft of jaw crusher is worn

If there is little wear on the shaft, simply to repair its geometry, the shaft neck can be turned on the lathe to achieve the correct geometry, and then the bearing bore diameter can be reduced accordingly.However, after several times of such treatment, if the size of the shaft neck is 5% smaller than the original, it is no longer allowed to turn, and should be replaced with a new shaft.If there is little wear on the shaft, simply to repair its geometry, the shaft neck can be turned on the lathe to achieve the correct geometry, and then the bearing bore diameter can be reduced accordingly.However, after several times of such treatment, if the size of the shaft neck is 5% smaller than the original, it is no longer allowed to turn, and should be replaced with a new shaft.

3. Eccentric shaft and bearing bush

Jaw crusher is working under the impact load, the bushing on the babbitt alloy lining, working period of about two years or so, beyond the time limit, then need to recast.If the eccentric shaft and the bearing bush, the spindle and the bearing bush are worn, and the top clearance is 1.5 times larger than the original assembly clearance, the pad should be added to adjust or replace;The trench should be reopened and adjusted if 1.5mm is worn.When the gap between the cover of connecting rod head and eccentric shaft is worn to more than 1.5 times of the assembly gap, it also needs to be adjusted with padding or replaced with a new one.When the babbitt alloy on the bearing shell has a deep peeling or a large scratch, should be recast.For the quality of the processed bearing bush has the following requirements: the color of the surface of babbitt alloy should be uniform, matt, silver white;There should be no slag, crack, sand hole, shrinkage hole and peeling phenomenon in the surface layer of babbitt alloy.

The page source:https://www.lvssn.com/Industry/How-can-the-service-life-of-jaw-crusher-be-prolonged.html

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Causes of jaw plate damage of jaw crusher and maintenance methods

Product introduction:https://www.cementepc.net/crusher/Jaw-crusher.html

The jaw plate is the core of the jaw crusher working directly with the material contact.In the crushing material, crushing teeth by the material's extrusion, grinding, impact, bear a huge load, the direct result is that the jaw plate is easy to wear.After the crushing teeth wear out, the power consumption of the crushing station will increase. In serious cases, the equipment will be shut down. Frequent replacement of jaw plate will also affect the benefits.Therefore, we must learn the causes of jaw damage and maintenance methods of jaw crusher.

1. Causes of jaw wear and maintenance methods

The main reason of jaw plate wear of jaw crusher is that the material moves relative to the jaw plate in short distance, the cutting metal causes abrasive chips, and the jaw plate repeatedly squeezes the material to cause the jaw plate material to deform for many times, resulting in fatigue chip and wear of the metal material.

1.1 causes of jaw wear

(1) when the machine is running, the material enters the crushing chamber, and the movable jaw is driven by the eccentric shaft to be close to the movable jaw. The two jaws slide with the material relatively short distance, and the material cuts the jaw to form abrasive chips. (2) moving jaw plate and fixed jaw plate are sometimes close to, sometimes away from, the material is repeatedly squeezed to chisel the two jaw plates, and micro-cracks are formed on the surface of the jaw plate, or at the root of the protruding part of the extrusion metal, and the micro-cracks are continuously extended to connect, causing the metal material on the surface of the jaw plate to fall off and form abrasive chips. (3) the metal material of the jaw plate is locally fractured or raised due to long-term repeated extrusion of the material by the two jaw plates, and the broken or raised part falls off with the material hit by extrusion, forming abrasive debris.

1.2 maintenance method of jaw wear

(1) the material selection of jaw crusher should be high toughness, friction resistance and extrusion resistance of high-performance materials; (2) the jaw crusher avoids other hard debris entering the crushing chamber during feeding, and cleans the crushing chamber timely after each use. (3) the machine must be operated in accordance with the specified operation time during use, and the machine cannot be operated continuously for a long time without rest.

2. Causes of jaw fracture and maintenance methods

2.1 causes of jaw fracture

(1) the casting process of the jaw plate is not perfect, and there are some serious defects such as intensive porosity inside. (2) the movable jaw moves in the frame, and one end of the bottom of the frame hits the edge guard plate. (3) the tension of the pull rod spring fails to be replaced in time. (4) the discharge port is smaller than the specified range, the feeding position is wrong, and the Angle of the feeding hopper is too steep to make the material directly hit the moving jaw head. (5) the equipment USES unqualified bracket and bracket pad, so that when the jaw crusher is subjected to strong impact, the bracket does not have self-breaking protection.

2.2 maintenance method of jaw fracture

The internal structure of the two jaw plates is tight due to the excellent casting process.Adjust the size of the feeding port according to the specifications and parameters, continuously and evenly feed the material, and ensure the feeding position in the middle;Replace the rod spring, bracket, bracket pad and other damaged accessories, adjust the Angle of the hopper.

The page source:https://www.cementepc.net/productknowledge/Causes-of-jaw-plate-damage-of-jaw-crusher-and-maintenance-methods.html