High Precistion Shield Machine Bearings

Shield machine bearing maintenance and repair

The maintenance and repair of shield machine bearings and the remanufacturing of key components can be seen at a glance. It is mainly reflected in the following three aspects.

The first is the main material of the shield machine bearing, which must meet the large load, impact load and large torque, and must be stable, reliable and safe. Second, the inspection, maintenance, repair and imitation of rolling elements, surveying and manufacturing of shield machine bearings must meet the original design of shield machine bearings and the safety factor of subsequent excavation.

Third, the overall cage and segmented cage of shield machine bearings are made of complex materials, including all-copper cage, engineering plastic cage and steel cage surfacing copper process.

The remanufacturing of the fourth shield machine bearing, such as replacing the outer gear ring, replacing the inner gear ring, replacing all the rolling elements, and replacing the cage, is essentially the imitation and new manufacturing of the shield machine bearing, and the reliability is fully satisfied. Excavation needs.

The competition between the large bearing of the ladle and the bearing of the shield machine and the large bearing of the floating crane bearing and the wind power transport ship is mainly about heavy load, reliability and life, followed by reliability and stability.

The large bearing of the ladle mainly requires high reliability.

Shield machine bearing requirements are heavy load and stability must be met.

Floating crane bearings and large bearings of wind power transport ships are large in diameter, ranging from 5 meters to 10 meters.

 

In general, it is low speed, heavy load and high stiffness, and the reliability and life should be unified, which can be above the overall life of the equipment design.

Judgment According to the technical problems such as the use and current situation of the main bearing of the shield machine and its repair, the basic state of the bearing must be investigated first. Generally, the Luoyang bearing manufacturer will send someone to inspect the actual bearing.

The relevant technical requirements and other matters of the shield machine were fully discussed and inquired about the bearing’s putting into use, operating status, running time and mileage. Based on the following standards, the following shield machine main bearing maintenance, repair, repair and replacement options One of the technical solutions.

1. The general design life of shield machine bearings will not exceed 10,000 hours, which is limited by the harsh working conditions and complex stress methods of shield machine bearings.

2. The bearing of the shield machine is also determined by the mileage of the excavation, generally 6-8 kilometers forcibly scrapped

3. Maintenance is generally 3-5 kilometers, and the rock layer is generally 1-2 kilometers for maintenance.

4. The hardness layer determines the evaluation of the life computational domain, especially the tooth surface hardness and the channel hardness.

5. The life evaluation is generally the calculation of 60%-80% of maintenance; maintenance is generally 40%-60% of the expected life.

6. Material selection, GJG.

The safety, stability and reliability of the shield machine bearing are improved by 90% after the repair of the shield machine bearing. The main principle is that the grinding amount of the groove after grinding is about 0.5- 1mm, the effective hardness depth layer is greater than 5.5mm, the rolling body is sorted and used, the grinding amount is about 0.05-0.20mm, and the deformation of the cage is corrected at the same time, and the lubrication channel is cleared.

Technical service and support Yuan Gaogong I5B–965B–OI9O. Secondly, in the key remanufacturing field, it is very important to replace all the rolling elements, the main thrust balls, the auxiliary thrust balls and the radial balls. Secondly, the action of replacing the inner gear ring is the most critical, which is almost equivalent to replacing the entire set of large bearings, which can be used as new bearings.

The surveying and mapping imitation is treated. In principle, the service life of the repaired shield machine bearing is greater than 5000 hours, or 3-5 axioms as the expected life.