How to maintain the bridge crane

1. Appearance of the bridge crane: clean the appearance, so that there is no dust accumulation and no yellow robes. Check for cracks and open welding.

2. Carts and trolleys: ① Check and fasten whether the transmission shaft seat, gearbox, coupling, shaft and key are loose. ②Check and adjust the brake wheel clearance to make it uniform, sensitive and reliable.

3. Check the bridge crane reducer mainly to see if it leaks oil. If there is abnormal noise in the box during operation, it is necessary to open the box cover to check. Generally, it is caused by bearing damage, excessive gear meshing backlash, and serious tooth surface wear.

4. Lifting winch: ① Check whether the wire rope, hook and pulley are safe and reliable, and should be replaced if the wear exceeds the specified value. ②Check and adjust the brake to make it safe, sensitive and reliable.

5. Inspection of wire ropes of bridge cranes. The inspection of the wire rope should focus on observing broken wires, wear, kinks, rust, etc. For some positions with serious wear and broken wires but not exceeding the standard, marks should be made for follow-up and re-inspection. Pay attention to check whether the safety limiter of the wire rope in the drum is effective, whether the wire rope pressure plate on the drum is pressed tightly and whether the number of pressure plates is appropriate.

6. Lubrication: Check the oil quality and quantity of all parts, and add or replace lubricating oil as required.

7. Inspection of overhead crane pulleys. Whether the wear at the bottom of the groove exceeds the standard and whether there are cracks in the cast iron pulley. For the balance wheel of the pulley block of the pitching mechanism, it is easy to be ignored because it does not move under normal circumstances. Therefore, it is necessary to check the flexibility of its rotation before installation. Otherwise, the length and tension of the left and right wire ropes in the installation cannot be automatically adjusted by the balance wheel, which increases the difficulty and danger of adjusting the pitching rope at high altitudes.

8. Electrical: 1. Check whether the limit switches are sensitive and reliable; 2. Check whether the actions of the electrical appliances in the electrical box are sensitive and reliable; 3. Check whether the motor, bell, and wires are safe and reliable; 4. Check whether the signal lights are in good condition.

 9. Check whether the couplings of the overhead crane are loose or even "roll keys". Focus on checking whether the elastic rubber ring of the elastic pin coupling is abnormally worn, and pay special attention to the wear of the gear ring of the toothed coupling. Due to poor installation accuracy, when there is a large offset between the two shafts, the entire ring gear will quickly wear out in a short period of time. If such a situation occurs in the hoisting mechanism, serious accidents are likely to occur.