Maintenance of bridge crane
摘要：1). The appearance of the bridge crane: sweep the appearance completely, so that there is no dust and no yellow robe. Check for cracks and open welding. 2) Large carts and small carts: ①Check and tighten the transmission shaft seat, gearbox, coupling, shaft and key for looseness; 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, open the box cover to check. Generally due to bearing damage or gear meshing backlash
1). The appearance of the bridge crane: sweep the appearance completely, so that there is no dust and no yellow robe. Check for cracks and open welding.
2) Large carts and small carts: ①Check and tighten the transmission shaft seat, gear box, coupling, shaft and key for looseness; 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, 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 the wear exceeds the specified value and should be replaced. ②Check and adjust the brake to make it safe, sensitive and reliable.
5) Inspection of wire rope of bridge crane. Check the wire rope should focus on observation of broken wires, wear, kinks, rust, etc., for some places where the wear and broken wires are more serious but have not exceeded the standard, make a mark to focus on tracking and re-inspection. Attention should be paid to check whether the safety limiter of the steel wire rope in the drum is effective, whether the steel wire rope pressing plate on the drum is pressed tightly and whether the number of pressing plates is appropriate.
6) Lubrication: Check the oil quality and quantity of all parts, and add or replace lubricating oil as required.
7) Check the pulley of bridge crane. The focus is on whether the amount of wear at the bottom of the groove exceeds the standard and whether there are cracks in the cast iron pulley. As for the balance wheel of the pulley block of the luffing mechanism, it is easy to be overlooked because it does not work under normal circumstances. Therefore, be sure to check the flexibility of its rotation before installation, otherwise, the length and tension of the pitching left and right wire ropes cannot be automatically adjusted by the balance wheel during installation, which increases the difficulty of adjusting the pitching rope at high altitude and the degree of risk of operation.
8) Electrical: ①Check whether the limit switches are sensitive and reliable; ③Check whether the actions of the electrical appliances in the electrical box are sensitive and reliable; ③Check whether the motor, electric bell, and wires are safe and reliable; ④Check whether the signal lights are good.
9) Check whether the couplings of the bridge crane are loose or even "rolling 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 time. If such a situation occurs in the lifting mechanism, serious accidents are prone to occur.
2) Large carts and small carts: ①Check and tighten the transmission shaft seat, gear box, coupling, shaft and key for looseness; 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, 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 the wear exceeds the specified value and should be replaced. ②Check and adjust the brake to make it safe, sensitive and reliable.
5) Inspection of wire rope of bridge crane. Check the wire rope should focus on observation of broken wires, wear, kinks, rust, etc., for some places where the wear and broken wires are more serious but have not exceeded the standard, make a mark to focus on tracking and re-inspection. Attention should be paid to check whether the safety limiter of the steel wire rope in the drum is effective, whether the steel wire rope pressing plate on the drum is pressed tightly and whether the number of pressing plates is appropriate.
6) Lubrication: Check the oil quality and quantity of all parts, and add or replace lubricating oil as required.
7) Check the pulley of bridge crane. The focus is on whether the amount of wear at the bottom of the groove exceeds the standard and whether there are cracks in the cast iron pulley. As for the balance wheel of the pulley block of the luffing mechanism, it is easy to be overlooked because it does not work under normal circumstances. Therefore, be sure to check the flexibility of its rotation before installation, otherwise, the length and tension of the pitching left and right wire ropes cannot be automatically adjusted by the balance wheel during installation, which increases the difficulty of adjusting the pitching rope at high altitude and the degree of risk of operation.
8) Electrical: ①Check whether the limit switches are sensitive and reliable; ③Check whether the actions of the electrical appliances in the electrical box are sensitive and reliable; ③Check whether the motor, electric bell, and wires are safe and reliable; ④Check whether the signal lights are good.
9) Check whether the couplings of the bridge crane are loose or even "rolling 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 time. If such a situation occurs in the lifting mechanism, serious accidents are prone to occur.
