An air tightness testing machine for making nylon rods for valve stems

Abstract

The invention discloses an airtightness testing machine for manufacturing a nylon rod applied to a valve stem. The airtightness testing machine comprises a frame. A test area is arranged on the frame.A number of test stations are arranged in the test area. A support frame, a fixed sealing end cover and a movable sealing end cover are arranged in the test stations. The central axis of the fixed sealing end cover and the central axis of the movable sealing end cover coincide with the central axis of a nylon rod to be tested on the support frame. The fixed sealing end cover is fixedly arranged on the frame. The movable sealing end cover is driven by a power mechanism to move toward the fixed sealing end cover. The fixed sealing end cover and one end of the nylon rod to be tested form a double-sealing structure. The movable sealing end cover and the other end of the nylon rod to be tested also form a double-sealing structure. Vent holes are arranged in the center of the fixed sealing endcover and the movable sealing end cover respectively. One end of each vent hole leads to the radial end surface of the nylon rod to be tested, and the other end of the vent hole is connected with an external air source. The airtightness testing machine provided by the invention has the advantages of simple operation, labor and time saving and accurate detection.

Description

technical field [0001] The invention belongs to the technical field of air tightness testing of valves, in particular to a testing machine for testing the air tightness of nylon rods used for making valve stems. Background technique [0002] The PE valve is the main control component in the gas pipeline, which can be used to adjust the gas flow. At present, the common PE valves on the market adopt the floating ball switch mode. In order to control the rotation of the spool ball, a valve stem made of nylon rod needs to be inserted into the valve to connect the sphere and external control accessories. Since this section of the valve stem needs to extend into the valve body, it is required that the corresponding nylon bar must be solid and airtight. However, in the production process of the nylon rod, due to the relationship of the manufacturing process, it is possible to form a hollow thin tube invisible to the naked eye. Since nylon rods are drawn into the desired shape aft...

AI Technical Summary

Problems solved by technology

[0003] The airtightness test equipment for nylon bars is still in a blank state at present. Since the airtightness of the entire section of bars does not represent the airtightness after interception, the hollow tubes in the bars may have Some places don't have it, so it should be tested mainly on the nylon bar stock that has been cut and used to make the valve stem

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