End face seal pressure test head device of hydraulic pressure testing machine

Abstract

The invention relates to an end face seal pressure test head device of a hydraulic pressure testing machine, comprising a connection plate. The connection plate is fixedly provided with an outer sleeve which is provided with a first flange on the outer side at one end contacted with the connection plate; the outer sleeve is internally provided with an inner sleeve; the inner sleeve and the outer sleeve are sealed through a radial sealing ring; a second flange is arranged on the outer side of the inner sleeve away from one end of the connection plate; a guide sleeve is fastened on the second flange; step holes are arranged on the opposite end surfaces of both the guide sleeve and the inner sleeve; end face sealing rings are arranged in the two step holes; a spring preloading device is arranged between the first flange and the second flange and comprises a spring bolt; the first flange is in thread connection with the spring bolt which passes through a hole of the second flange; and a preloading spring is sleeved in the middle part of the spring bolt. The invention has the advantage that the device is suitable for steel pipes with larger tolerance and automatically complements contraction of the steel pipe during a test, thereby the test range of a hydraulic press is enlarged.

Description

technical field [0001] The invention belongs to the technical field of welded steel pipe detection, and in particular relates to an end face sealing pressure test head device of a hydraulic testing machine. Background technique [0002] At present, the output of welded steel pipes occupies a relatively large proportion in the domestic steel pipe industry, but most welded pipes can only be used for general water gas transmission and structural steel pipes because they have not been tested for medium and high pressure hydraulic pressure (7-32MPa). Only a small number of high-quality welded steel pipes that have passed medium and high pressure hydraulic tests can be applied to important industries such as oil, natural gas, automobiles, and chemicals. Therefore, the development of steel pipe hydraulic testing machine technology has played a vital role in the continuous expansion of welded pipe application fields. [0003] The pressure test head in the welded steel pipe hydrauli...

AI Technical Summary

Problems solved by technology

The end face seal is divided into fixed end face seal, oil-water balance follow-up end face seal and differential pressure cylinder follow-up end face seal; The degree of shortening, taking the steel pipe of φ610X12000mm as an example, during the high-pressure hydraulic test (greater than 20MPa), the steel pipe is shortened by about 10mm, and the fixed end face seal test head is only suitable for low-pressure and medium-pressure water because it has no follow-up tracking function. Pressure test (less than 15 MPa), and the fixed end face seal pressure test head has strict requirements on the tolerance of steel pipe length (tolerance is 0 ~ 6mm), the steel pipe is too long to cut off the sealing ring, and the steel pipe is too short to maintain pressure

Although the oil-water balance follow-up end face seal and the differential pressure cylinder follow-up end face seal are suitable for medium and high pressure (7-25 MPa), the oil-water balance follow-up end face seal and the differential pressure cylinder follow-up end face seal involve In the fields of mechanics, electricity and hydraulics, the structure is complex and difficult to maintain

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