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Calculation method for pulling-out force of shaft seizure bearing bush and pulling-out method

A calculation method and pull-out force technology, applied in the calculation field of bearing bush pull-out force, can solve the problems of prolonging emergency repair time, difficult work, and increasing enterprise cost, so as to avoid underestimation, shorten emergency repair time, and reduce enterprise cost Effect

Active Publication Date: 2021-07-27
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of a calculation method for the pull-out force system of the shaft-seized bearing bush, the current maintenance personnel are very blind in selecting jacks and welding temporary pull-out tools when performing pull-out operations. Insufficient carrying capacity of the extraction tool results in repeated operations, which prolongs the repair time and increases the cost of the enterprise
However, it is difficult to directly use large-tonnage jacks and welding temporary pull-out tools, and it also consumes a lot of working time and wastes manpower and material resources.

Method used

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  • Calculation method for pulling-out force of shaft seizure bearing bush and pulling-out method
  • Calculation method for pulling-out force of shaft seizure bearing bush and pulling-out method
  • Calculation method for pulling-out force of shaft seizure bearing bush and pulling-out method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] A cold shear in a factory caused the bearing bush to burn out and the main shaft to die due to lack of oil. The bearing bush is made of ZCuAl 9 Fe 4 Ni 4 Mn 2 , The bearing bush and the bearing pad seat are designed as a transition fit, and the interference is -0.04 ~ 0.063mm. The circular pin with a diameter of 12 × 20mm is used on the end face of the bearing pad seat to realize the circumferential direction of the bearing pad to prevent the bearing pad from rotating. When the accident occurs, the bearing bush and the main shaft are seized and there is no relative rotation, and the bearing bush and the bearing pad seat rotate relative to each other. The specific structure is as follows: figure 1 shown.

[0101] In the above embodiment, the positioning in the circumferential direction of the bearing bush is realized with the positioning round pin, and the calculation method and the extraction method are as follows:

[0102] Step 1: Calculate the resistance Fs caused...

Embodiment 2

[0114] In a factory, the cutting arm of the flying shear was burnt out and the shaft was bitten due to lack of oil. The material of the bearing pad is ZQAL7-1.5-1.5, the transition fit between the bearing pad and the bearing pad seat is designed, and the interference is -0.04~0.033mm. The bearing pad is positioned in the circumferential direction through two hook keys to prevent the bearing pad from rotating. When the accident occurred, the bearing bush and the shaft were seized and there was no relative rotation, and there was no relative rotation between the bearing bush and the bearing pad seat.

[0115] In the above embodiment, the bearing bush circumferential direction positioning is realized with two hook keys, and the calculation process is as follows:

[0116] Step 1: Calculate the resistance Fs caused by the tearing off of the outer surface of the bearing bush;

[0117] Resistance Fs=λδA / 9800,

[0118] Analyzing the positioning method of the bearing bush, one side (...

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Abstract

The invention discloses a calculation method and a pull-out method for pull-out force of a shaft seizure bearing bush, and belongs to the field of rotary machine maintenance. The pullout force F of the bearing bush is the sum of the extrusion force Pxc and the resistance Fs, when the bearing bush positioning device adopts a round pin, the resistance Fs1=delta x (Lxdx + 3.14 dx2 / 4) / 1531.25 or Fs2 =delta ddxb / (306.25 de), and the larger one of theresistance Fs1 and the resistance Fs2 is taken. According to the method, by calculating the pull-out force, a basis is provided for maintenance workers to select a jack and a welding temporary pull-out tool, the operation time is shortened, the maintenance cost is reduced, and the economic loss is reduced.

Description

technical field [0001] The present application relates to the field of maintenance of rotating machinery, in particular, it relates to the calculation of the pull-out force of the bearing bush when the shaft is seized. Background technique [0002] The bearing pad refers to the part of the semi-cylindrical surface in the shape of a tile at the contact part of the sliding bearing and the journal. Its main function is to bear the force exerted by the journal, so that the bearing can work smoothly and reduce the friction loss of the bearing. The joint use of shafts and bearing pads is a common structure of rotating machinery equipment. The shafts and bearing pads are under high temperature, high speed and high load working conditions for a long time, resulting in serious abnormal wear. In severe cases, the surface of the bearing pad and the shaft will be adhered, and eventually the bearing pad will burn out and the shaft will be seized. [0003] In order to replace a burned ou...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/20G06F119/14
CPCG06F30/17G06F30/20G06F2119/14
Inventor 陈烨戴文笠曹勇姜海军赵磊张雪飞蔡海彬陈小星詹高潮洪云辉巫献华
Owner SGIS SONGSHAN CO LTD
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