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Crane failure and troubleshooting (components)

Update time : 2020-09-12 Publisher:Dotrum

Rolling bearing failure and cause status:

1. The temperature is too high. 2. Abnormal sound (continue to mute) 3. Metal grinding sound. 4. Filing or impact sound
Causes of failure: 1. Lubricating oil is dirty, completely lack of oil or too much oil 2. Bearings are dirty 3. Lack of oil 4. Cage and rolling elements are damaged.
Remedy: 1. Remove dirt, replace bearings, and check the quantity of lubricant. 2. Remove dirt. 3. Come on. 4. Replace the bearing.
Brake failure and cause status:
1. The brake wheel cannot be braked (the heavy object slides down)
The cause of the failure: (1) The hinge of the lever is stuck. (2) There is oil stain on the brake wheel and friction plate. (3) The electromagnet core does not have enough stroke. (4) The brake wheel or friction plate is severely worn. (5) The main spring is loose and damaged. (6) The lock nut is loose and the tie rod is loose. (7) The impeller of the hydraulic push brake does not rotate well.
Remedy: (1) Clear the jamming fault (2) Clean the oil (3) Adjust the brake (4) Replace the friction plate (5) Replace the friction plate (6) Tighten the lock nut (7) Overhaul the mechanism and electrical parts of the pusher
2. The brake is not released
Reasons for the failure: (1) The solenoid coil is burned out (2) The wire leading to the solenoid is disconnected (3) The friction plate is stuck on the brake wheel (4) The living hinge is stuck (5) The main spring is too strong or equipped The weight is too large (6) The brake ejector rod is bent and the electromagnet cannot be pushed (on the hydraulic push rod brake) (7) The oil is used improperly (8) The impeller is stuck (9) The voltage is lower than 85% of the rated voltage, the electromagnet Insufficient suction
Remedy: (1) Replace (2) Connect the cable (3) Clean with kerosene (4) Eliminate jamming and lubricate (5) Adjust the main spring force (6) Straighten the ejector rod or replace the ejector rod (7) Press Working environment temperature Change the oil (8) Adjust the push rod mechanism and check the electrical part (9) Find out the cause of the voltage drop and troubleshoot
3. The brake heats up, the friction plate emits a burnt smell and wears quickly
The cause of the failure: (1) After the brake shoe is released, it is not evenly disengaged from the brake wheel, resulting in friction. (2) The gap between the two brake shoes and the brake wheel is uneven, or the gap is too small. (3) The auxiliary spring of the short-stroke brake is damaged or bent. (4) The working surface of the brake wheel is rough.
Remedy: (1) Adjust the gap (2) Adjust the gap (3) Replace or repair the auxiliary spring (4) Turn the brake wheel surface as required
4. The brake is easy to leave the adjustment position, and the braking torque is not stable enough
Reasons for failure: (1) The adjusting nut and back nut are not tightened (2) The thread is damaged
Remedy: (1) Tighten the nut (2) Replace
5. The electromagnet generates heat or makes noise
Reasons for the failure: (1) The main spring force is too large (2) The lever system is jammed (3) The armature and the iron core are in incorrect position
Remedy: (1) Adjust to a suitable size (2) Eliminate the cause of jamming and lubricate (3) Scrape the bonding surface
Reducer failure and cause status:
1. There is periodic gear flutter, especially the driven wheel
The cause of the failure: the pitch error is too large, the tooth side clearance is too bad
Remedy: repair, reinstall
2. Vigorous metal friction, vibration of the reducer, clinking of the casing
Reasons for failure: (1) Transmission gear backlash is too small, the two gear shafts are not parallel, and the tooth tip has sharp edges (2) The gear working surface is not flat
Remedy: (1), (2) Repair, reinstall
3. When the gears are engaged, there is uneven knocking sound and the casing vibrates
Cause of failure: oil defect on tooth surface, gear is not in contact along the entire tooth surface, but in a corner
Solution: Replace the gear
4. The housing, especially the place where the bearing is installed heats up
Reasons for failure: (1) Broken bearing (2) The journal is stuck (3) Gear is worn (4) Lack of lubricating oil
Cause of failure: (1), (2) Replace the bearing
5. Oil leakage on split surface
Reasons for failure: (1) Seal failure. (2) The box body is deformed. (3) The split surface is not flat. (4) The connecting bolts are loose.
Remedy: (1) Replace the seal. (2) Check and repair the split surface of the box, and replace it if it is deformed seriously. (3) Shovel the split surface. (4) Clean the oil return tank and tighten the bolts.
6. The reducer vibrates on the base
Reasons for failure: (1) The anchor bolts are loose. (2) It is not concentric with the connecting axis of each component. (3) The base has poor rigidity.
Remedy: (1) Adjust the anchor bolts (2) Adjust the alignment (3) Reinforce the base to increase rigidity
7. The reducer heats up as a whole
Cause of failure: too much lubricant
Remedy: adjust the amount of oil
Sliding bearing failure and cause status:
Excessive fever
Causes of failure: (1) Bearing deflection or over-tightening (2) Improper clearance (3) Insufficient lubricant (4) Unqualified lubricant
Remedy: (1) Eliminate the deflection and tighten reasonably (2) Adjust the gap (3) Add lubricating oil (4) Change to qualified oil
The operating mechanism of the crane cart failure and its cause status:
The bridge runs skewedly and gnaws the track
Reasons for failure: (1) The diameter error of the two active wheels is too large. (2) Not all active wheels are in contact with the track. (3) The axis of the driving wheel is not correct. (4) The metal structure is deformed. (5) The track installation quality is poor. (6) There is oil or frost on the top of the rail.
Remedy: (1) Measure, process, and replace the output wheel. (2) Drive the full-load trolley to the end where the trolley is behind. If the trolley goes straight, it means that the driving wheel at this end is not in full contact with the track and the wheel pressure is small. You can increase the diameter of the driving wheel at this end. (3) Check and eliminate axis deflection. (4) Correction. (5) Adjust the track to make the track meet the installation technical conditions. (6) Eliminate oil stains and frost.
Troubles and causes of the trolley operating mechanism:
1. skidding
Reasons for failure: (1) Oil stains on the top of the rail, etc. (2) Uneven wheel pressure (3) Elevation of two rails in the same section
The difference is too big (4) The starting brake is too violent
Elimination methods: (1) Make clear (2) Adjust the pressure roller (3) Adjust the track to meet the technical conditions (4) Improve the method of starting the motor, select a wound motor
2. The trolley runs on three legs
Reasons for the failure: (1) The wheel diameter deviation is too large (2) The installation is not reasonable (3) The trolley frame is deformed
Remedy: (1) Process according to the requirements of the drawings (2) Readjust and install according to the technical conditions (3) Frame correction
3. The body twists when starting
Reasons for failure: (1) Uneven pressure on the small wheels or a suspended active wheel (2) Gnawing the rail
Remedy: (1) Adjust the three-leg phenomenon of the trolley (2) Solve the gnawing track
Wire rope pulley system failure and cause status:
1. The wire rope wears quickly or frequently breaks down
Reasons for failure: (1) The diameter of the pulley and the drum is too small (2) The rope groove size on the drum does not match the rope diameter, too small (3) There is stolen goods, lack of lubrication (4) The lifting limit baffle is not installed Correctly grind the rope frequently (5) The bottom of the rope groove or the wheel flange is not smooth and defective
Remedy: (1) Replace a wire rope with better flexibility, or increase the diameter of the pulley or drum (2) Replace a wire rope with the same lifting capacity but a smaller diameter, or replace the pulley and drum (3) Clear and lubricate ( 4) Adjustment.
2. Individual pulleys do not rotate
Cause of failure: lack of oil, dirt and corrosion in the bearing
Remedy: lubricate and clean.
The failure of the rail clamp and its cause: the braking torque is small and the rail cannot be clamped
The cause of the failure: (1) The living hinge is stuck and the lubrication is poor. (2) The brake band is worn (jaw wear) and the braking torque is significantly reduced.
Remedy: (1) cleaning and lubricating (2) replacing the wearing parts
It should be replaced and used for restoration by other institutions. 5. Replace worn parts.
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