Cylinder external pressure resistance testing device

Abstract

The invention discloses a cylinder external pressure resistance testing device which comprises a body, a testing cavity is formed in the middle of the body, an inner cavity is formed in the wall of the body, an inner lining and an outer lining are arranged on the two sides of the inner cavity respectively, the inner lining is arranged between the inner cavity and the testing cavity, a liquid inlet and a liquid outlet are formed in the outer wall of the body, and the liquid inlet and the liquid outlet are both communicated with the inner cavity. A liquid medium is adopted for pressurization, safety is achieved, the pressure loading range is large, and the device meets the 1-30 MPa pressure test requirement; the elastic deformation of the device wall is large during pressurization, the applicable outer diameter range of a cylinder test piece is wider, and time and labor are saved during installation; the outer lining and the inner lining ensure the safety and firmness of the device wall, so that the device wall is prevented from being damaged in advance during testing, and the use frequency and time of the device are improved; the device walls at the two axial ends of the device are thicker, so that the possibility that the device is damaged from the two ends in advance when the pressure load is larger is reduced, and the test accuracy and success rate are improved.

Description

technical field [0001] The invention belongs to the field of material testing, and in particular relates to a cylinder external pressure resistance testing device. Background technique [0002] In recent years, pressure vessels have been more and more widely used in aerospace, medical, rail transportation, machinery and other fields, especially pressure vessels based on composite or metal cylinders have developed rapidly. Among them, the two ends of the cylinder are heads with flat end faces opening or hemispherical, semi-ellipsoidal and other forms. During the subsequent molding process or service work, the cylinder will be subjected to different degrees of external pressure loads, and may lose its original geometric shape instantaneously, buckling failure occurs, and cause serious damage. Therefore, testing the external pressure resistance of the cylinder is extremely important to prevent buckling failure. [0003] Chinese patent CN 204085868 U discloses an airbag for ex...

AI Technical Summary

Problems solved by technology

However, the device and method still have the following problems: (1) Theoretically, the gas can be compressed infinitely, and there is a safety risk in using gas to suppress it; (2) The deformation of wear-resistant materials such as PVC is small after pressurization, and the applicable cylindrical test piece The outer diameter range is small; (3) When the hoops and ribs are combined with the air bag for the pressure test, the air bag is easy to be destroyed in advance from the mesh formed by the hoops and ribs, resulting in test failure; (4) When the air is pressurized, Compared with other parts, the axial ends of the airbag are more likely to inflate, which may cause the airbag to fail in advance, resulting in test failure

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