Supersonic spray welding process for hard alloy on sealing surface of butterfly valve

Abstract

The invention discloses a hard alloy supersonic spray welding process for a butterfly valve sealing surface. The hard alloy supersonic spray welding process comprises the following steps that firstly, the surface of a valve body is cleaned through a sand blasting machine; secondly, the valve body is conveyed to a heavy rotary table through a transfer mechanism; thirdly, spray welding treatment is conducted on the sealing face of the valve body; the transfer mechanism comprises a base, a rotating rod rotationally arranged on the base, an extension plate and a valve clamping and releasing assembly, the valve clamping and releasing assembly comprises an outer barrel, a sliding column, a clamp, a free rod, a tension spring and a telescopic cylinder, a barrel groove is formed in the outer barrel, a rotating area is arranged in the middle of the sliding column, the clamp is rotationally arranged in the rotating area, and a ball groove is formed in the end face of a handle. And a guide groove is formed in the position, located at the top of the barrel groove, of the outer barrel, and the inner wall of the top of the guide groove is provided with an inclined face allowing the clamps to abut against each other and driving the tops of the two clamps to rotate towards the sides close to each other, spray welding treatment on the sealing face of the valve body is efficiently and safely achieved, and the spray welding coating quality of the sealing face of the valve body is improved.

Description

technical field [0001] The invention relates to the field of valve spray welding, in particular to a hard alloy supersonic spray welding process for a sealing surface of a butterfly valve. Background technique [0002] The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media, among which there are quite a variety of varieties and specifications; the butterfly valve opening and closing part is a disc-shaped The disc plate rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjustment. The surface of the disc plate increases the surface hardness of the spray welding layer. The spray welding technology is a kind of oxyacetylene flame as the heat source. After spraying the alloy powder on the treated working surface, heating the coating to melt and wet the machined surface, and through the mutual dissolution and diffusion ...

AI Technical Summary

Problems solved by technology

[0002] The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media, among which there are quite a variety of varieties and specifications; the opening and closing part of the butterfly valve is a disc-shaped The disc plate rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjustment. The surface of the butterfly plate improves the surface hardness of the spray welding layer. The spray welding technology is a kind of oxyacetylene flame as the heat source. After the alloy powder is sprayed onto the treated working surface, the coating is heated to melt and wet the processed surface, and through the mutual dissolution and diffusion of the liquid alloy and the solid surface of the workpiece, the metallurgical combination is realized and a dense spray welding layer is formed. ; Plasma spray welding is a method of melting and depositing alloys using alloy powder as filler metal. It is widely used in the fields of valve manufacturing and repair. At present, various eccentric valves still use the traditional manual surfacing process, which is time-consuming. , laborious and unable to guarantee the quality of surfacing welding, manual operation will cause great harm to the human body, and at the same time increase the corresponding production costs or losses of the enterprise, and before the surfacing welding process, the valve needs to be sandblasted by a sandblasting machine to treat the sealing surface. After processing, manually remove the valve body from the discharge port platform of the sand blasting machine and transfer it to the rotary table for clamping. This process requires manual contact with the valve body, which will cause pollution on the sealing surface of the valve body and affect the stacking capacity. Adhesion effect between coating film and sealing surface during welding

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