Remanufacturing method for main bearing of shield tunneling machine

Abstract

The invention provides a remanufacturing method for a main bearing of a shield tunneling machine. The remanufacturing for the main bearing is capable of further prolonging the working life of the mainbearing, lowering the life cycle cost, shortening the purchasing cycle, and lowering the purchasing cost. In addition, use and maintenance departments can further analyze problems existing in the original equipment according to the analysis report of the damage condition of the main bearing, carry out technical transformation and update, and improve the application working condition of the equipment, so that the reliability of the equipment is further improved, and the running cost is lowered.

Description

Technical field: [0001] The present application relates to the technical field of shield machines, in particular to a method for remanufacturing main bearings of shield machines. Background technique: [0002] With the intensification of the aging phenomenon of shield machines in service in China, the scrapping and replacement of main bearings has become a common problem in engineering construction. Focusing on the efficient recycling of resources, it has become a positive trend to actively carry out research on key technologies such as alternative technologies, reduction technologies, reuse technologies, resource technologies, and systematization technologies. [0003] As the key load-bearing part of the shield machine, the main bearing of the shield machine undertakes the task of slewing support between the shield cutter head system and the power system, which greatly affects the reliable work of the entire shield machine. The main bearing of the shield machine is general...

AI Technical Summary

Problems solved by technology

The main bearing of the shield machine is generally a three-row cylindrical roller bearing, and the three rows of rollers are evenly distributed along the circumference. The axial force and overturning moment are borne by the main thrust rolling element and the auxiliary thrust rolling element, and the radial force is borne by the radial rolling element. , the outer ring is connected to the shield body through bolts, and the inner gear ring is connected to the cutter head through bolts. Its working characteristics are: low speed, large load, and complicated loading conditions. In actual work, the main bearing of the shield will be subjected to axial force, The effect of radial force, overturning moment and abrupt load is likely to cause large deformation and cause damage to related parts, which seriously affects the normal operation and service life of the shield, thus affecting the construction safety of shield machinery and engineering

The main bearing of the shield machine is a low-speed and heavy-duty slewing bearing. Its structural characteristics and working conditions determine that its failure mode is generally manifested as fatigue fracture and surface wear. During operation, many factors can damage the bearing, such as improper installation, Poor lubrication, intrusion of moisture and dust, etc. can cause premature damage to the bearing

Images