A gate valve leak detection chuck controlled by a single hydraulic cylinder for pressing multiple jaws

Abstract

The invention relates to a gate valve sealing detection chuck using a single hydraulic cylinder to control multiple claws for compaction. The gate valve sealing detection chuck comprises an overturn portion and a clamping portion. The overturn portion comprises bearing substrates. The upper ends of the bearing substrates are hinged to a test table, overturn hydraulic cylinders are arranged between the bearing substrates and the test table, the central portion of the test table is provided with a through hole, and bar-shaped holes are arranged around the through hole; and the clamping portion comprises the test table, an auxiliary substrate is fixedly connected below the test table, a clamping hydraulic cylinder is fixed at the central portion of the auxiliary substrate, the shaft of the clamping hydraulic cylinder passes through the through hole to be connected with a pressure plate, the pressure plate is provided with an air outlet, the edge of the auxiliary substrate is provided with recesses, the two side surfaces of each recess are each provided with a slideway, the bottom portions of the recesses are provided with circular grooves, the circular grooves are internally provided with springs, and a limiting hoop is arranged below the auxiliary substrate. According to the invention, multiple pressure arms are simultaneously controlled by use of an ejection hydraulic cylinder, and accordingly, the compaction motion of multiple pressure blocks is controlled at the same time, such that the synchronization is better. Besides, the limiting hoop is internally provided with a U-shaped clamp, such that the motion stability of the pressure arms is ensured, and the compaction precision of the pressure arms is improved.

Description

technical field [0001] The invention relates to the technical field of a valve sealing performance detection device, in particular to a gate valve sealing performance detection chuck which is controlled by a single hydraulic cylinder and pressed by multiple claws. Background technique [0002] In the gate valve manufacturing enterprises, the air tightness test must be carried out after the gate valve is offline and before it is sold. The conventional test method is: first close the gate valve, and then press a flange of the gate valve on the test bench. There is an air outlet. When a sealed environment is formed between the gate valve and the test bench, fill water into the cavity on the other side of the gate valve, and open the air outlet on the test bench at the same time to see if there are bubbles coming out of the water on the other side of the gate valve. To determine whether the gate valve sealing is good. In order to ensure the airtightness between the gate valve a...

AI Technical Summary

Problems solved by technology

In order to ensure the airtightness between the gate valve and the test bench and prevent the gas in the sealing chamber from leaking from between the gate valve and the test bench, which will affect the test effect, the test bench is usually provided with a briquetting block for pressing the gate valve body. In the prior art The briquetting blocks are usually controlled separately, the movement coordination between the briquetting blocks is poor, it is difficult to precisely clamp the gate valve at the same time, and the mechanism for controlling the movement and rotation of the briquetting blocks is complicated, resulting in the overall bulky and inactive gate valve air tightness testing device. Flexible, slow clamping speed, low clamping accuracy

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