Clamp special for combined tension test of gate valve closing member

Abstract

The invention discloses a clamp special for a combined tension test of a gate valve closing member. The clamp comprises a clamp base, wherein a concave bayonet is formed in each of the left side and the right side of the upper part of the clamp base, a cutting board is arranged at the inner side of each concave bayonet, the inner side of each cutting board is clung to a pressing piece, a top plate capable of moving up and down is arranged below the clamp base, the top plate is capable of pushing the pressing piece to move upwards, a surface at the inner side of each cutting board and matched with the pressing piece is an inclined surface, the pressing piece supports against the inclined surface and is capable of aslant sliding along the inclined surface, the inclined surfaces at the inner sides of the two cutting boards form a splayed sliding surface, the two pressing pieces are capable of aslant sliding up and down along the splayed sliding surface, fixing boards are arranged at the front side and the rear side of each concave bayonet, the two fixing boards located on the same concave bayonet are used for clamping the front side and the rear side of the pressing piece, the mutually opposite inner side surfaces of the two pressing pieces are reversed inclined surfaces, the two reversed inclined surfaces are of an inverted splayed structure, and convex anti-skidding bosses are arranged on the upper parts of the reversed inclined surfaces of the pressing pieces.

Description

technical field [0001] The invention relates to a fixture specially used for combined tensile test of gate valve closing parts. Background technique [0002] In the prior art, the combined tensile test of the gate valve closing part to detect the strength of the gate valve is to connect the gate valve and the bolt rod connected with the gate valve, and use a tensile machine to test whether the connection part of the gate valve and the bolt rod meets the qualified standard. process until it breaks, and the broken part occurs on the bolt rod body, the strength of the gate valve is up to the standard. If the broken part is on the connection part of the gate valve and the bolt rod, the strength of the gate valve is not enough. Most of the current gate valves are in the shape of a trapezoid with a wide top and a narrow bottom instead of a rectangle, that is, the two sides of the gate valve are not parallel. Therefore, when the gate valve is fixed on one end of the tension machine...

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Problems solved by technology

[0002] In the prior art, the combined tensile test of the gate valve closing part to detect the strength of the gate valve is to connect the gate valve and the bolt rod connected with the gate valve, and use a tensile machine to test whether the connection part of the gate valve and the bolt rod meets the qualified standard. process until it breaks, and the broken part occurs on the bolt rod body, the strength of the gate valve is up to the standard. If the broken part is on the connection part of the gate valve and the bolt rod, the strength of the gate valve is not enough

Most of the current gate valves are in the shape of a trapezoid with a wide top and a narrow bottom instead of a rectangle, that is, the two sides of the gate valve are not parallel. Therefore, when the gate valve is fixed on one end of the tension machine, it is not easy to fix it stably. Generally, there are several fixing methods. , one is if Figure 5 As shown, cut the two sides of the gate valve flat and then fix them; the second is as shown Image 6 As shown, weld a stick on the gate valve for fixing; the third is as shown Figure 7 The above three common ways to fix the gate valve on the tensile machine all have defects. Cutting the gate valve flat or piercing the middle of the gate valve will directly destroy the stress structure of the gate valve. It affects the strength of the gate valve, so that it affects the final test results of the gate valve, and welding a rod to fix it. During the welding process, due to the high temperature, it will also cause chemical changes to the material of the gate valve itself, which will eventually affect the gate valve. The test results

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