Sealing testing machine

Abstract

The invention discloses a sealing testing machine and aims to provide the sealing testing machine which is convenient to operate, high in test result accuracy and capable of preventing two tube ends of a ball valve from being damaged by clamping. The sealing testing comprises an air feed pump, an air pressure sensor, a main frame, two push plate cylinders, two lateral frames, a main end cover and an auxiliary end cover. The two push plate cylinders are respectively arranged on the two lateral frames, wherein a piston rod of one push plate cylinder is connected with the main end cover, and a piston rod of the other push plate cylinder is connected with the auxiliary end cover. The main end cover is provided with a main elastic sealing ring pad. The auxiliary end cover is provided with an auxiliary elastic sealing ring plate. The main end cover is provided with a main cover air hole. The sealing testing has the advantages that the ball valve is positioned and clamped in position, the sealing performance is ensured, and the ball valve is prevented from being damaged by clamping; a sealing structure with a self-adaptive adjustment function is provided, and the sealing effect in a high pressure detection process is strengthened; in addition, an auxiliary positioning structure is provided, the end covers are prevented from returning, the push plate cylinders are protected, the sealing effect is improved, and the stability of the detection process is maintained.

Description

technical field [0001] The invention belongs to the technical field of airtightness testing of ball valves, and in particular relates to an airtightness testing machine. Background technique [0002] Ball valves are commonly used opening and closing parts for gas or liquid circulation. They are used in different occasions and have different sealing requirements. Therefore, they need to be tested for sealing before leaving the factory, otherwise there will be greater safety hazards. [0003] In the prior art, when testing a ball valve, a gasket or a sealing ring is usually placed on the outside of both ends of the ball valve, and at the same time, a force-applying device such as a jack or a hydraulic cylinder is used to clamp the two ends of the ball valve, so that the gasket or sealing ring and the ball valve are two The end is sealed, and the whole sealed ball valve is immersed in water, and then compressed gas is passed into the ball valve to test its sealing performance. ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned test method has the following disadvantages: 1. The operation process is complicated, and the weight of the frame is relatively heavy. It is necessary to immerse the frame in water with the help of external equipment, and the installation of the ball valve is also relatively troublesome; 2. The ball valve is sealed by pressing down the plate with a jack And when the sealing ring is placed outside the two ends of the ball valve and clamped on both ends of the ball valve by a hydraulic cylinder for sealing, the strength of both is difficult to control. The seal of the part is not reliable, which will affect the accuracy of the test and cause misjudgment of quality. If the force of pressing down or clamping is excessive, the ball valve will be deformed, causing the end surface (pipe end) of the ball valve to be uneven, thus making the ball valve It cannot form a seal with the pressure plate, which will lead to misjudgment of quality. In addition, if the force of pressing down or clamping is excessive, the ball valve may be directly damaged

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