Sealing device for hydraulic burst test of fiber composite circular tube

Abstract

The invention discloses a sealing device used for a hydraulic bursting test of a fiber composite round pipe. The sealing device comprises a water injection piston mounted at the upper part of a test piece inner chamber using a mounting guide ring and a sealing piston mounted at the lower part of the test piece inner chamber using the mounting guide ring, wherein the a sealing gasket, an O-shaped sealing ring, a sealing part are arranged on the outer peripheral wall of the water injection piston from the top to the bottom in sequence; a water injection spout is connected to the interior of a step screw hole in the middle of the water injection piston; a sealing part, an O-shaped sealing ring, a sealing gasket are arranged on the outer peripheral wall of the sealing piston from the top to the bottom in sequence; during assembly, the test piece is placed in an anti-explosion cylinder; a heel block is arranged at the lower part of the sealing piston; an upper cover is screwed into the upper part of the inner chamber of the anti-explosion cylinder, so that the water injection spout penetrates through the center hole in the upper cover; a lower cover is screwed into the lower part of the inner chamber of the anti-explosion cylinder; a through hole for leading a data line out is formed in the outer peripheral wall of the anti-explosion cylinder. According to the invention, a piston-type design without a pull rod is adopted, so that the sealing device is simple in structure, good in sealing effect, safe, reliable and reduced in test cost, and can be used for test pieces with different lengths.

Description

technical field [0001] The invention belongs to a sealing device for a blasting test, in particular to a sealing device for a circular tube of fiber composite material for a hydraulic blasting test. Background technique [0002] At present, fiber-reinforced composite materials (such as carbon fiber and glass fiber) are more and more widely used in industrial and civil fields, and have replaced the status of traditional steel and iron to a certain extent. The superiority of the mechanical properties of fiber-reinforced composite materials, The reason is that the mechanical properties in the fiber direction are excellent. For circular tubular fiber composite products, the most effective method to obtain the real data of the mechanical properties in the hoop direction is the internal pressure test method. [0003] The commonly used medium in the internal pressure test method is water. During the hydraulic test, the sealing performance of the test piece is the key problem to be ...

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Problems solved by technology

[0003] The commonly used medium in the internal pressure test method is water. During the hydraulic test, the sealing performance of the test piece is the key problem to be solved. Since the fiber composite material is a high-strength material, the maximum inner diameter of many industrial fiber composite material circular tubes is The pressure value is relatively large, and sometimes the internal pressure value even exceeds 100MPa; while most of the existing fiber composite material circular tube sealing devices adopt the restraint end sealing method with internal tie rods or core rods, and most ultra-high pressure sealing devices are equipped with rigid The outer casing is used to limit the deformation of the round tube, so it is difficult to achieve a sufficient interference fit between the sealing ring and the test piece, which not only leads to poor sealing effect, but also needs to install explosion-proof safety devices, which has complex structure, cumbersome assembly, Disadvantages of time and effort

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