Maintenance method and device for slewing bearing part of gantry crane

Abstract

The invention provides a maintenance method and device for a slewing bearing part of a gantry crane. The maintenance device comprises jacking supports (5) fixed to a cylinder (2) and jacks (4) arranged between the jacking supports (5) and a rotary table (1). In the maintenance process, a connecting bolt between a slewing bearing (3) and the cylinder (2) is detached. The jacks (4) are operated to jack the rotary table (1) upwards, and then the portion above the slewing bearing (3) of the gantry crane is jacked upwards. When the slewing bearing (3) is separated from the slewing bearing face of the cylinder (2) at a certain gap, the connecting bolt between the slewing bearing (3) and the rotary table (1) is detached. The damaged slewing bearing (3) is pulled out from the jacked space gap. A complete slewing bearing is fed to an original installation position. The slewing bearing is connected to the lower portion of the rotary table (1) through a bolt. The jacks (4) are adjusted, the slewing bearing (3) falls to make contact with the slewing bearing face of the cylinder (2), connecting fastening is conducted through a bolt, and maintenance work is finished.

Description

technical field [0001] The invention relates to the technical field of maintenance of portal cranes, in particular to a maintenance method and device for a slewing bearing part of a portal crane. Background technique [0002] Portal crane is a boom-type crane whose bridge frame is supported on the ground track or foundation through the outriggers on both sides. It is widely used in loading and unloading operations in ports, berths close to ports, and hydropower stations. The operation lasts for a long time and the load is heavy. During the process, the glideway of the slewing bearing is often damaged. Damage to the glideway of the slewing bearing will cause the upper part of the slewing bearing to overturn and cause a major accident. Therefore, the slewing bearing must be repaired in time. [0003] The whole machine of portal crane includes turntable, cylindrical body, slewing bearing and other components. The turntable is equipped with slewing mechanism and hoisting mechani...

AI Technical Summary

Problems solved by technology

The existing technology has the following disadvantages: during the maintenance process, the cylinder body, slewing bearing, turntable and the above parts (including wires and cables, pipes) must be disassembled and installed once, the maintenance time is long, the workload is heavy, and the assembly of the equipment must be achieved. Accuracy requirements, high technical quality requirements for personnel; various types of cranes must be occupied when parts are disassembled and installed, and due to the long maintenance time, the number of shifts used is large, which greatly increases the maintenance cost; the cylindrical body Maintenance and processing requires large-scale equipment or special-purpose equipment. Due to its large diameter and length, it is difficult to find suitable equipment for processing in some areas, which indirectly increases processing costs and prolongs the maintenance cycle; Parts need to occupy the surrounding space, affecting on-site production, and easily lost or damaged

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