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Maintenance And Repair Of Large Cranes

Jun 13, 2017

The slewing bearing of a large crane (crane) is an important "joint" of a large crane, so its maintenance is very important. So how to maintain the slewing support of large cranes?

In the implementation of maintenance work, the first to be aware of the risk of being dragged into the rotating pinion, Big Crane Claw Machine the risk of crushing and shearing.

When performing the following tasks, make sure that any maintenance staff is not in the danger zone between the main arm, the car and the roll, or between the exit and the roll, except in the driver's room, when the engine is activated to perform the necessary slewing and luffing actions.

1, large cranes before each work or at least once a week, visually check the slewing bearing bolts;

2, slewing support for the first time after 100 working hours, should check whether the bolts loose, the No. 300 work hour to check again; Every 500 working hours will be inspected once; the bad working condition should shorten the inspection interval. Check if the bolt is found loose, Big Crane Claw Machine please stop the construction work, and immediately contact the local after-sales service department, by the factory or professional and technical personnel to check the decision, whether the demolition, Big Crane Claw Machine inspection and treatment;

3. The slewing bearing is filled with lithium base grease before installation;

4, the replacement of bolts, the bolt wipe clean, coated with thread fastening after tightening; According to the Operation manual and Crane performance table requirements of the use of large cranes, or according to the requirements of regular inspection of fastening bolts, Big Crane Claw Machine you can avoid the risk of fatigue damage of bolts;

General inspection of slewing bearings

1, periodically check the flexibility of rotation, such as the detection of noise, impact, should be immediately shut down to check, troubleshooting, when necessary to remove;

2, periodically check whether the rotary gear ring has cracks or broken, Big Crane Claw Machine meshing tooth surface has no occlusal, gnawing, tooth surface peeling phenomenon;

3, regular inspection of the integrity of the seal, if found that the seal belt breakage should be replaced in a timely manner, such as the discovery of shedding should be timely reset.

Lubrication Rotary support tooth surface

Slewing Ring Ring in the factory has been coated antirust oil, this rust-proof period generally 3-6 months, more than the validity period, should be timely coated with anti-rust oil.

In addition, in use, to prevent the Rotary branch to withstand direct sunlight exposure. It is forbidden to rinse the slewing ring directly with water, in case of entering the raceway, Big Crane Claw Machine to prevent the hard foreign body from approaching or entering the tooth meshing area.

The raceway must be lubricated regularly in accordance with the working environment. After working for the first time 50 hours should be filled with lubrication grease, 300 working hours per job and then injected a times. The slewing support must be filled with grease before and after prolonged placement. If you use a steam jet cleaner or a stationary sprinkler to clean a large crane, you must be careful to ensure that the water does not penetrate the slewing bearing connection, and then the slewing bearing connection must be lubricated. Special working environment, such as tropical, humidity, dust, temperature change and continuous work, should shorten the lubrication cycle.

The grease should be carried out in the case of slow rotation of the slewing ring, when the grease is spilled from the seal to indicate that the filling is complete, Big Crane Claw Machine and the spilled Grease will form a film, sealing effect.