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New process for detaching coupling key through liquid nitrogen

A coupling and new process technology, applied in metal processing, manufacturing tools, metal processing equipment, etc., can solve the problems of difficult disassembly of keys and key grooves, scratches on the inner wall of key grooves, etc., and achieve the advantages of convenient operation, labor saving, and reduced scratches The effect of the probability of occurrence

Active Publication Date: 2019-12-06
成都中车四方轨道车辆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the key and keyway of the gearbox coupling in the prior art are difficult to disassemble and the inner wall of the keyway is easily scratched during the disassembly process, the present invention provides a new process for disassembling the coupling key with liquid nitrogen, the purpose of which is to : After the coupling key is corroded, the key can be disassembled without damaging the keyway and key, improving the qualified rate of operation

Method used

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  • New process for detaching coupling key through liquid nitrogen
  • New process for detaching coupling key through liquid nitrogen
  • New process for detaching coupling key through liquid nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] [1] Separate the small shaft of the gearbox from the coupling, and leave the key in the keyway on the side of the coupling;

[0030] [2] The fence made of non-drying putty is used to seal at both ends of the coupling. The fence is as follows image 3 As shown, they are respectively located at both ends of the through hole of the main body of the coupling, and the enclosure part blocks the through hole, so that the inner wall of the through hole and the enclosure form a frame-shaped space together; on the circumference of the edge of the through hole, the key and keyway It should be located within the range blocked by the enclosure so that the key and keyway are located in the box-shaped space;

[0031] [3] Pour liquid nitrogen into the frame-shaped space through the unblocked part of the through hole to soak the key and keyway. The preferred time for soaking the key and keyway in liquid nitrogen is 20-40S. If liqu...

Embodiment 2

[0033] This embodiment includes the following steps:

[0034] [1] Separate the small shaft of the gearbox from the coupling, and leave the key in the keyway on the side of the small shaft of the gearbox;

[0035] [2] Use non-drying putty to make a fence on the shaft extension end of the small shaft of the gearbox, so that the non-drying putty and the gearbox together form a frame-shaped space with an opening upward, so that the key and keyway are located in the frame-shaped space , for example, the frame-shaped space can be made into shapes such as strips, ellipses, or cuboids;

[0036] [3] Pour liquid nitrogen into the frame-shaped space through the upper opening of the frame-shaped space to soak the key and keyway. The preferred time for soaking the key and keyway in liquid nitrogen is 20-40S. If the liquid nitrogen evaporates or leaks within this time If it is reduced, liquid nitrogen should be replenished in time to keep the key and keyway in liquid nitrogen; after soakin...

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Abstract

The invention belongs to the technical field of rail transportation devices, and relates to subway vehicle inspection and maintenance, in particular to a new process for detaching a coupling key through liquid nitrogen. For the problem that in the prior art, detachment is difficult after a key and a key groove of a gear case coupling are rusted and corroded and the inner wall of the key groove islikely to be scratched in the detachment process, the technical scheme is adopted. According to the technical scheme, by means of non-drying putty, a frame shape is defined at the shaft extension endof a gear case small shaft or blocking is conducted at the two ends of the coupling, and therefore a frame-shaped space is formed; and after the liquid nitrogen is poured into the frame-shaped space,by prolonging the soaking time of the key and the key groove, according to the inherent thermal expansion and cold shrinkage principle of metal, the key and the key groove can generate tiny gaps, andtherefore the key is detached. By means of the scheme, it can be effectively avoided that the key and the key groove are scratched, and the operation percent of pass is increased.

Description

technical field [0001] The invention belongs to the technical field of rail transit equipment, and relates to the maintenance of subway vehicles, in particular to a new process for dismantling coupling keys with liquid nitrogen. Background technique [0002] In the urban rail vehicle maintenance industry, the gearbox coupling adopts a key and keyway structure. When disassembling, most of them use direct knocking to disassemble and remove the key. This process is widely used. [0003] Since the coupling of the subway vehicle needs to be disassembled during the overhaul of the frame, the coupling keys are corroded, painted, and the keys are stuck due to force, which makes it difficult to remove the key from the keyway. The knocking method is used for disassembly It is easy to cause scratches on the inner wall of the keyway. If the scratches are serious, the shaft head and the key must be replaced. In view of the corrosion of the key and the keyway, there is a problem that the...

Claims

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Application Information

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IPC IPC(8): B23P11/02
CPCB23P11/02B23P11/025
Inventor 翟好璟张仕华康小雪彭华
Owner 成都中车四方轨道车辆有限公司
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