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The elimination of common faults of jaw crusher

Date:2019-08-15 17:54     writer:cement editor     Views:

Jaw crusher commonly known as jaw broken, also known as tiger mouth.The crusher is composed of two jaw plates, the moving jaw and the static jaw.

Common faults in the use of jaw crusher:


1. After the sharp splitting sound, the movable jaw stops swinging, the flywheel continues to turn, and the spring of the tie rod relaxes.

Cause: the thrust plate is damaged by the material that cannot be broken or other reasons entering into the crushing cavity.

Elimination method: open the pull rod nut, remove the spring of the pull rod, suspend the movable jaw, and replace the new thrust plate.


2. The broken plate shakes and produces a crash sound.

Cause: the fixing bolt of the broken plate is loose.Broken plate fixing bolt.

Elimination method: tighten the fixing bolt of the broken plate, replace it if the spring is not elastic enough.Replace bolts.


3. The flywheel turns, the crushing stops, and the thrust plate disengages from the support.

Cause: pull rod spring or pull rod fracture.

Elimination method: replace damaged parts.


4. Impact sound or other abnormal sound is produced in the thrust plate support.

Cause: spring tightness is not enough or broken.Thrust plate support worn or loose.Thrust plate elbow is badly worn.The adjustment of the discharge orifice is not uniform, resulting in inconsistent thrust plate left and right.

Rule out: tighten the spring or replace the spring.Replace thrust plate support.Replace the thrust plate.Reset the outlet adjustment device.

jaw crusher

5. Loose flywheel.

Causes: too loose key fit, key and keyway wear seriously.Shaft end locking device is loose.

Rule out: tighten the key, or reopen the keyway to replace the key.Tighten the shaft end locking device.


6. Increase the particle size of broken products.

Cause: the bottom of the jaw plate is badly worn.

Elimination method: adjust the adjusting device of discharge port to narrow the discharge port. If not, replace or replace the upper and lower jaw plate.


7. The crushing cavity is blocked, and the current of the main motor is higher than the normal operating current.

Why this happens: large rocks go into the top of the crushing chamber, but do not break up and cause blockages.Under the crusher belt machine failure, discharge port is blocked.Too much material is fed into sticky materials and other sundries to block the discharge port.

Elimination method: after parking, use steel wire rope to tie the big stone and then use crane to lift the big stone out of the crusher.Stop feeding, eliminate the belt machine fault, at this time as far as possible without the crusher.Stop feeding, dredge the outlet, at this point as far as possible without the crusher.Slow down the speed of the feeder to reduce the feeding quantity.


8. Bearing heating (exceeding permissible temperature).

Cause: the oil pipe is blocked and the oil flow is not smooth.Oil pump leak, insufficient oil supply pressure.The grease is too dirty and mixed with sundries.The clearance between the bush and the shaft is too small.Improper choice of lubricating oil, viscosity is too big or too small.The oil heater is not turned on before starting in winter. The oil is too sticky.In the summer, the oil from the pump does not pass through the oil cooler, or the oil cooler failure, such as water pipe blockage, poor flow, water break.Failure of the cooling water unit of the bearing circulation, such as blockage, etc.The discharge port is adjusted too small (the thrust plate is too long), which makes the eccentric shaft too stressed.Transmission belt is too tight, bearing force is too big.

Elimination method: dredge and clean the oil pipe.Repair oil pumps.Clean the bearing tiles and replace the lubricating oil.Open the bearing, rescrape the tile to add tile pad, adjust the gap.Change the proper lubricating oil.Turn on the oil heater.Eliminate the oil cooling fault, make the oil pass through the cooler.Troubleshoot the cooling water system of bearing circulation.Properly relax the discharge port.Loosen the belt so it is not too tight.


9. Bearing oil leakage (mainly occurs in the bearing structure, and the oil penetrates into both sides through the clearance between bearing bush and rocker).

Causes: the use of medium bearing bush deformation or processing is not accurate, resulting in loose coordination between the bearing bush and rocker.The small clearance between the shaft and the bearing bush increases the oil pressure between the two bearings.

Elimination method: replace the bearing shell.Adjust the gap, it is better to make the gap at both ends slightly larger than the gap in the middle.


10. Adjustment wedge top seat fails

Cause: wedge-shaped crown moves horizontally too far forward.

Rule out: pull the wedge back.


11.Eccentric shaft broken.

Cause of occurrence: bear large sudden load (eg fall into iron).

Elimination method: control large load, strengthen iron removal measures.


12. Broken movable jaw.

Cause of occurrence: bear big load.Poor material.Improper design or defective casting.

Elimination method: prevent excessive load (control particle size, prevent iron from entering).Improved materials.Improve design, improve manufacturing quality.


13.Oil pressure drop in oil feeding system.

Cause: there is something wrong with the oil pump.Oil is too cold.The oil supply valve failed.

Elimination method: repair oil pump.Heat the oil.Repair or replace the oil supply valve.


14. Oil pressure rises and oil temperature rises correspondingly in the oil supply system.

Cause: the oil pipe is blocked or the oil groove in the part is blocked.

Elimination method: clean the oil pipe, oil groove, or replace the filter screen.

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