Common malfunction inspection and maintenance method for semi gantry cranes

- May 15, 2018 -

Common malfunction inspection and maintenance method for semi gantry cranes


There are many kinds of failures of semi gantry cranes, including circuit faults, power supply system failures and brake failures.


Common malfunction and maintenance method of half door crane

The maintenance and maintenance of the door type lifting device is the basis for ensuring the good operation and safe operation of the machinery. The following principles should be followed when maintenance is carried out. The maintenance link is simple and operational; it can ensure that the mechanical technology is good, the maintenance cost is not high, and the disassembly and disassembly process is reduced as soon as possible; With advanced maintenance technology and management method, the working intensity of maintenance can be reduced to the maximum.


1 main girder problems and maintenance methods


The main faults of the half gantry crane are the main girder sinking and the horizontal bending of the main girder.

(1) the main beam sank. The main cause of the main beam sinking is: the main girder structure is overstress, the rigidity is not enough, the joint clearance is too large; overloading use; the use of more years; thermal effect or heat radiation effect; stringed bar or abdominal rod deformation; storage, transportation, and hoisting use is not correct. For the main girder subsidence, the maintenance methods are mainly as follows: using flame and prestress to repair two ways; strengthening the part.

(2) horizontal bending of the main beam. The main reasons for the horizontal bending of the main girder are: improper welding process during manufacture, improper storage and transportation. The main way to maintain the horizontal bending of the main girder is to use the flame straightening method and correct the use of the puller and the top gear.


2 track Problems and maintenance methods

The common faults in the track of the semi-gantry crane: looseness and defect of the track pressure bolt, the open welding or deformation of the press plate; excessive gauge, loose track, crack and scar on the rail surface; heavy rail surface wear, too large joint clearance or error.

Position. The main maintenance methods for the above failures are to replace or tighten the pressure plate bolts, to re weld the press plate, to adjust the gauge and joint clearance to the specified value, and to replace the track.


3 pulley Problems and maintenance methods

The common malfunction of semi-goliath crane pulley is: excessive wear of the pulley rope groove, or uneven wear, the slide flange crack, the wire rope easy to fall off the slots, the failure of the pulley installation, the excessive wear of the pulley shaft, and the increase of the wear of the wire rope. The main maintenance methods for the above failures are: replacing the pulley rope slot, using the positioning parts, repairing the wire rope hopping, adjusting the position of the pulley, and replacing the new pulley.


4 wire rope Problems and maintenance methods

The common faults in the wire rope of the semi gantry crane are that the surface oil of the wire rope is not enough, there are bending, breaking, squash, twisted, and the cord core is exposed; the reduction of the diameter of the wire rope exceeds the standard, and the number of broken wire in the distance of a twist is more than 7. Maintenance methods are as follows: add lubricating oil on the surface of the wire rope, stop using the wire rope that knotted and break the strand, and replace the new wire rope.


5 Reels Problems and maintenance methods

The common failure of the reel of the half door type crane is that there is a crack on the cylinder, and the shaft and key of the reel are badly worn, the shaft is cut off, the reel rope groove is worn, the wire rope hopping or the rope is confused, and the wear is too large. Maintenance methods are mainly: welding repair; stop use, repair and replace parts for shaft, key and other components; replace the new drum.


6. Brake Problems and maintenance methods 

The common malfunction of the half door type crane brake is that the brake can not be opened because of the destruction of the electromagnetic coil, the insufficient suction of the electromagnet, the adhesive of the electromagnetic brake on the fouling brake wheel, the clamping of the movable joint, the failure of the hydraulic push rod brake and so on; the brake belt is quickly worn; the brake can not be brake effectively; the brake is not effective. The device is easy to remove the adjustment position. The main maintenance methods aimed at the above failures are: replacing the battery coil, repairing the low voltage cause, cleaning the brake wheel and brake belt with kerosene, eliminating the clamping phenomenon, adjusting the spring pressure, adjusting the brake or replacing the new brake wheel, tightening the nut, repairing nut or screw thread buckle.


7. Reducer: Problems and maintenance methods

The common failures of the half door crane reducer are: periodic gear trembling, intense metal friction sound, uneven percussion sound in gear meshing, overheated box, gear breakage, oil leakage. The main maintenance methods for the above failures are as follows: repair or replace the gear; adjust the clearance of the transmission parts; replace the bearings, replace and fill the lubricants; replace the seal ring.

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