Sealing device for internal pressure test of multi-caliber plastic pipe

Abstract

The invention discloses a sealing device for internal pressure test of a multi-caliber plastic pipe. The sealing device comprises a frame, a screw driving device and a sealing unit. The screw drivingdevice comprises a power mechanism arranged in the top of a frame and a screw driven by the power mechanism, and the screw extends towards the bottom of the frame; the sealing device comprises a bottom head fixed to the bottom of the frame and an upper head arranged over the bottom head, a pull bar is connected and arranged between the upper head and the lower head, and the upper portion of the upper head is connected to the tail end of the screw, and is provided with an exhaust hole and a water injection hole; the upper head and the lower head are provided with compressing flanges that can sleeve the plastic pipe respectively, and are also provided with flange holes matching the compressing flanges. Compared with the prior art, the sealing performance during test is high, the cost can beeffectively reduced, labor and time are saved, and it is ensured that the sealing device is not disengaged from the pipe in the pressurizing process.

Description

technical field [0001] The invention relates to the technical field of plastic pipe pressure test detection, in particular to a sealing device for multi-diameter plastic pipe internal pressure test. Background technique [0002] At present, plastic pipes are widely used, and the most common ones are water pipes and drain pipes. Among the various physical and chemical indicators of plastic pipes, the internal pressure resistance test is one of the most important indicators, and it is also the most important must-do item in the inspection indicators of plastic pipes. According to the requirements of "Test Method for Internal Pressure Resistance of Thermoplastic Pipes for Fluid Conveyance" (GB / T 6111-2003), before doing the internal pressure resistance test, both ends of the sample should be sealed first, and then pressurized. Usually, when doing the internal pressure test, plugs are generally used for sealing. Plugs with a diameter of less than 300mm are provided randomly by ...

AI Technical Summary

Problems solved by technology

In practice, we found that plugs with a diameter larger than 300mm have two major defects: 1. The price is expensive. A pair of plugs with a diameter of 400mm costs more than 10,000 yuan, and a pair of plugs with a diameter of 800mm reaches more than 80,000 yuan; 2. The workload is heavy. To install a multi-caliber plug, two inspectors need to work for one to two hours; 3. The sealing performance is poor. After the multi-caliber plug is connected to the plastic pipe, failure often occurs during the pressurization process. Under high internal pressure, resulting in tube detachment, eventually leading to test failure

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