The Maintenance of Jib Crane

The Maintenance of Jib Crane

In order to extend the weight of the crane, improve the utilization rate of the equipment and ensure safe production, the daily maintenance and planned maintenance of the lifting equipment must be done well. Users are advised to perform maintenance in accordance with the following specifications.

(一)Daily maintenance:

Correctly performing crane maintenance during the inspection interval is the basis for ensuring normal and continuous operation of the crane. The maintenance of the crane during the inspection interval is divided into: Inspection on duty. Including maintenance, external inspection, cleaning, lubrication and tightening.

1)First level maintenance:ao

 It is a regular maintenance work, which is under the responsibility of crane operators, mainly including inspection, lubrication, fastening and adjustment of wire ropes, drums, pulleys, bearings, couplings, reducers, brakes, etc.

2)Secondary maintenance:

It is a regular maintenance work, which is responsible for the maintenance workers, including the maintenance and maintenance of the entire mechanism and equipment of the crane.

 

1. Establish equipment inspection system

In order to ensure the safe operation of the crane, the first task is to do a good job of crane inspection.

1) Daily inspection

The related shift operation system of crane operators is carried out in combination, and the major shifts of the crane's electromechanical components are mainly carried out by crane operators, such as hooks, wire ropes, brakes of various institutions, controllers, limiters of various institutions and various Check whether the safety switch is sensitive and reliable.

The specific inspection items are as follows: Check whether the main power switch of the protection box has been cut off, and re-energize and check. 

Whether the wire rope is broken, whether the winding of the drum and the pulley is normal, whether there is grooving, knotting, twisting, etc., and whether the pressure plate bolts at the end of the rope are tightened.

Whether the hook is cracked, whether the anti-loosening device of the hook nut is complete, and whether the spreader is complete and reliable.

Whether the brake shoe of each mechanism's brake is close to the brake wheel, how is the wear of the brake shoe lining and the brake wheel, whether the opening plate is complete, whether the magnet meets the requirements, and whether the rod is stuck.

Whether the connecting bolts of the rotating parts of each mechanism and the fixing bolts of each component are fastened.

Whether the wiring of various electrical equipment is normal, and whether the contact between the conductive slider and the sliding wire is good.

The crane checks whether the action of the end limit switch is flexible and normal, the movement of the safety protection switch is flexible, and the work is normal.

Whether the crane's various parts rotate normally, and whether there is any abnormal noise.

And clean the equipment 15 minutes before work to maintain a good sanitary environment.

2) Weekly inspection

Several operators who operate the crane jointly conduct a comprehensive inspection of the crane every weekend.

The weekly inspection includes: 

Contactor, controller contact and corrosion.

Wear of brake pads.

The connection of the key on the interlock and the tightening of the screw.

Wear of the wire rope for more than half a year.

Double brake lifting mechanism, each brake brakes the size of the inverter.

Whether each electrical limit switch is sensitive and reliable.

3) Monthly inspection

Crane operators and maintenance personnel (electricity, fitter) inspect the crane together. In addition to the weekly inspection, the monthly inspection also includes the following:

The tightening of the base screws of the motor, reducer, bearing support, angular bearing box and the wear of the motor brush.

The tightening of the wire rope pressure plate screw, the wear and lubrication of the wire rope for more than 3 months.

Wear of the wire insulation at the nozzle.

Lubrication of each limit switch shaft.

The amount of lubricant in the reducer.

Wear of the rope at the balance wheel.

Lubrication of open gear rotation.

4) Semi-annual inspection

In addition to the weekly and monthly inspections, the contents of the semi-annual inspection should also include the following: it can be carried out in conjunction with the first-level maintenance of the crane, and the operator and the repairer jointly carry out.

Control panel, protective box, controller, resistor, and each terminal block, the tightening of the terminal screws.

Tightening of end beam screws.

Lubrication of brake solenoid cylinder, oil quantity and oil quality of hydraulic brake solenoid.

Insulation of all electrical equipment.

Deformation of the metal structure and the presence of open welding.

The wheel was martyred.

5) Annual inspection

It can be combined with the secondary maintenance of the crane. In addition to the full content of the half-year inspection, it should also check whether the metal components are cracked and the welds are rusted; the wear and tear of the large and small wheels; the measurement of the large vehicle span and the large vehicle track span; Measure the static deflection of the main beam and perform static and dynamic load test runs; fully lubricate the crane.

(二)Precautions for use of cantilever crane

The use of cantilever cranes should follow the following rules:

1.The operator must be familiar with the structure and performance of the cantilever crane. After passing the training and assessment, he can operate the crane independently, and should comply with the safety regulations.

2. Every time you use it, check whether the transmission mechanism is normal, and the safety switches are sensitive and reliable.

3. There should be no abnormal vibration and noise when the cantilever crane is running.

4. Cancel the use of cantilever cranes beyond the norm, and must abide by the "No Ten Cranes" regulations in crane safety management regulations.

5. When the cantilever or hoist runs to the end point, reduce the speed and cancel the use of the end point limit as a parking tool.

6. Problems that electric equipment should pay attention to during operation of cantilever crane:

a. Whether the motor is overloaded, abnormal vibration and noise;

b. Whether there is abnormal noise in the starter of the control box;

c. Whether the lead wire is loose and rubbing;

d. If a fault occurs, such as overheating of the motor, abnormal noise, smoke from the line and distribution box, etc., the machine should be stopped immediately and the power should be cut off for maintenance.

The operator must strictly abide by the safety technical operation regulations. The crane must be operated by itself to fully understand its performance, structure, working principle and operation method. It must also be checked frequently, maintained in time, and the problem will be solved immediately if it is found. Problems should be reported to the maintenance department immediately.