Bridge crane and gantry crane are our main product, and the overhaul of oil leakage of reducer of gantry crane and bridge crane is very important. Check measures to prevent oil spills of bridge crane and gantry crane. And some other answers to frequently asked questions about bridge and door cranes.

Overhaul of Oil Leakage of Reducer of Gantry Crane and Bridge Crane

Maintenance of oil leakage

① The oil leakage of the reducer usually occurs in the following places:

a. The joint surface of the reducer box is especially serious for the vertical reducer.

b. The shaft end cover of each shaft of the reducer, especially the shaft hole of the through cover.

c. The flat cover of the observation hole.

②Analysis of the causes of oil leakage:

a. The joint surface of the box body is processed rough, and the joint is not tight.

b. The box is deformed, and the joint surface and the bearing hole change accordingly, forming a gap.

c. The gap between the bearing cover and the bearing hole is too large, the oil return channel in the through cover is blocked, and the sealing ring of the shaft and the through cover is aging and deformed, and the seal is not tight.

d. Too much oil (the oil level should not exceed the scale line on the oil needle). The joint surface at the observation hole is uneven, the gasket is damaged or short, and the seal is not tight.

Measures to prevent oil spills of bridge crane and gantry crane

a. Scrape and grind the joint surface of the reducer to make them in close contact with each other and meet the technical standards.

b. Open the oil return groove on the joint surface of the base, and the overflowed oil can return to the oil tank along the oil return groove.

c. Apply liquid nylon sealant (or other sealant) on the oil leakage parts such as the joint surface of the box body, the hole of the bearing end cover and the oil sight cover.

d. For surfaces with relative rotation, such as shafts and through-cover holes, rubber sealing rings are used.

e. With seasonal temperature changes, choose suitable lubricating oil according to regulations.

f. The reducer running at low speed uses molybdenum disulfide as lubricant, which can eliminate oil leakage. The above is also suitable for the maintenance of the oil leakage of the reducer of the gantry crane.

Causes of burning motors of gantry cranes and bridge cranes

The possible reasons for burning the motor first are: the load of the crane is too heavy, the motor bearing is damaged, and the brake may not work, whether it is disengaged during operation or the electromagnetic coil is in poor contact, resulting in power failure and locking the brake drum.

Secondly, there are important reasons for the lack of phase, the reasons for the lack of phase:

1. The contacts of the contactor are frequently activated and ablated quickly, and the contact springs and the plastic at the contacts are burned and deformed, which will make the contact position insufficient and cause phase loss.
2. The fuse is too small to cause heating, blown out and phase loss.
3. Poor power contact causes phase loss.
4. The incoming wire of the motor is in poor contact.
5. Install a highly sensitive automatic circuit breaker and thermal over current protector, and install a phase loss controller to effectively prevent it. The above are the reasons why the motors of gantry cranes and bridge cranes burn out.

Brief Analysis of Bridge Crane and Gantry Crane Derusting and Maintenance Problems

If the bridge crane and gantry crane are left unused for a long time, it will rust. For some cranes that have been out of use for a long time, rust removal is important. The following is Henan Dejun’s list of bridge crane and gantry crane rust removal.

1. When the equipment needs to be shut down for maintenance, it is necessary to check the surface of the whole equipment in detail to ensure that the paint film on the surface of each part has not fallen off or damaged.
2. In the process of rust prevention, it is crucial not to ignore the moving parts of the crane. For these parts, you can use -10 or -20 diesel oil for brushing, which can not only remove the substances that are easy to corrode the equipment, but also form an oil film on the metal surface to resist low temperature.
3. If the paint film of the metal structure is found to be damaged in some places during the inspection, these damaged places should be cleaned, and then coated with antirust paint and other antirust paint for these places. Protect it from rain or snow, the metal surface will not be corroded due to weather problems.
4. In addition to cleaning and lubricating with diesel oil, apply a layer of lubricating oil. It is best to choose calcium-based or lithium-based grease, because they have a good effect on maintaining the performance of all aspects of the machine, and when the equipment is used again, these greases will be easier to remove.

Bridge cranes and gantry cranes are our mainly product, if you have need about them, please contact me freely, and we will provide you professional overhead crane and gantry crane solutions according to your working conditions and requirements.Welcome to consult us!