Device for checking welded joint of plunger

Abstract

The invention relates to a welded joint checking device for a vertical column, a plunger and similar products of a welding coal mine hydraulic bracket, and in particular relates to a device for checking a welded joint of the plunger. Sealing rings are arranged on a plugging piece; the outer part of the plugging piece is positioned by a sleeve; and the sleeve is fixed by screws. Three screw holes which are in threaded connection with the screws are formed in the sleeve; a clamping slot is formed in the plugging piece; O-shaped rubber rings are used as the rubber rings; and after a liquid feeding orifice in a piston end is provided with a sealing device, the conventional connector and a test pipeline are arranged at a liquid feeding orifice in the other end. The device has the advantages that after a welding working procedure, the welded joint in the plunger with liquid can be checked; before assembling, a product can be checked; the device is simple in structure and low in cost and is suitable for implementation; and the problem that bit cuttings in a drilled hole are difficult to clean after welding is performed is solved.

Description

technical field [0001] The invention relates to a weld seam inspection device used for welding coal mine hydraulic support columns, live columns and similar products, in particular to a live column weld seam inspection device. Background technique [0002] The hydraulic support for coal mine is a fully mechanized mining equipment that uses hydraulic pressure as the power to realize movements such as lifting and moving forward, and supports the roof of the coal mine. The hydraulic cylinder that is arranged nearly vertically to make the support generate support is called a column. The column is connected with the top beam and the base to provide the initial support force for the roof, and bear the load and dynamic pressure of the roof at the same time. It is the main support and hydraulic actuator part of the hydraulic support. It requires sufficient strength, reliable operation and long service life. The internal liquid movable column is generally used on the double telescop...

AI Technical Summary

Problems solved by technology

The pressure-bearing weld test can be carried out on the assembled hydraulic cylinder, but if the test object is unqualified, the high temperature of electric welding during rework may cause damage to the finished part, such as bending deformation, coating damage, etc.

However, in order to control the quality of the manufacturing process and repair problems in time, it is necessary to test the weld as soon as possible after the welding process and before finishing, which cannot be directly realized

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