Method for manufacturing jack cylinder of hydraulic support frame

Abstract

The invention discloses a method for manufacturing a jack cylinder of a hydraulic support frame, comprising the following steps: (1) processing a seamless steel tube into the jack cylinder and processing a liquid through hole on the jack cylinder; (2) processing the seamless steel tube into a straight tube according to the size of the a liquid through tube, conducting curved arc treatment on one end of the straight tube, thus leading the size and the shape of the port of the liquid through tube to be consistent with those of the liquid through hole on the jack cylinder; (3) adopting CO2 for gas shielded welding, using ER50-6 solder wires with the diameter of 1.2mm, selecting 200A welding currents, and directly welding the liquid through tube on the jack cylinder at an flat position of welding; and (4) according to the conventional working procedures, conducting processing for sealing the hole, and accomplishing the follow-up processing of the jack cylinder (1). As a joint seat arranged between the liquid through tube and a cylinder body is omitted when in manufacturing, and the liquid through tube is directly welded on the cylinder body, the joint seat can be saved, a welding line is reduced, the production efficiency is improved, and the probability of liquid leakage from the welding line is reduced simultaneously.

Description

technical field [0001] The invention relates to the processing of jack oil cylinders, in particular to a welding method for hydraulic support jack oil cylinders. Background technique [0002] The jack cylinder of the hydraulic support used in underground coal mines and the upper and lower cavity liquid pipes need to be connected through the joint seat, that is, the joint seat is welded to the cylinder body before the cylinder is machined, and then the cylinder body is machined. The liquid pipe of the straight pipe structure is welded on the joint seat. This manufacturing method needs to weld two weld seams, which is not only cumbersome to weld, but also increases the possibility of liquid leakage in the two weld seams. Contents of the invention [0003] The object of the present invention is to provide a method for manufacturing a hydraulic support jack cylinder with few parts and low weld seam leakage rate. [0004] To achieve the above object, the present invention can ...

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Problems solved by technology

[0002] The jack cylinder of the hydraulic support used in underground coal mines and the upper and lower cavity liquid pipes need to be connected as a whole through the joint seat, that is, the joint seat is welded to the cylinder body before the cylinder is machined, and then the cylinder body is machined. The liquid pipe of the straight pipe structure is welded on the joint seat. This manufacturing method requires two weld seams to be welded. Not only is the welding cumbersome, but the possibility of liquid leakage from the two weld seams increases

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