Work fixture for measuring rigidity of metal corrugated pipe expansion joint and assembly structure of metal corrugated pipe expansion joint

Abstract

The invention discloses a set of work fixture for measuring rigidity of a metal corrugated pipe expansion joint and an assembly structure thereof, and relates to the technical field of fixtures. Comprising a fixed end clamp and a movable end clamp. Wherein the movable end clamp comprises a clamp main body, a connecting column, an air tap elbow and a fixed clamping plate. The clamp body is provided with a first workpiece flange connecting hole. The connecting column is provided with a first connecting hole, and two sides are provided with first planes. And the exposed end of the air tap elbow is provided with an internal thread. The middle section of the fixing clamping plate in the thickness direction and the middle section of the clamp body in the thickness direction are in the same plane. The fixed end clamp comprises a clamp body and a connecting column. And a second workpiece flange connecting hole is formed in the clamp main body. Second connecting holes are formed in the connecting columns, and second planes are arranged on the two sides of the connecting columns. According to the invention, only one set of work fixture is used, the rigidity measurement test conditions of the metal corrugated pipe expansion joint and the assembly structure thereof with or without pressure in the axial direction and the transverse direction are simultaneously met, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of fixtures, and in particular relates to a tooling fixture used for a universal testing machine to measure the axial and transverse rigidity of a metal bellows expansion joint and its assembled structure with or without pressure. Background technique [0002] The axial and transverse stiffness measurement experiment of metal bellows expansion joint and its assembly structure with or without pressure is to measure the axial tension / compression stiffness of the metal bellows expansion joint and its assembly structure under specific internal pressure conditions , and lateral stiffness. It is required to maintain a specific air pressure in the workpiece during the measurement process, and at the same time perform axial tension, compression or lateral movement, and measure the load-displacement curve. [0003] The definition of the axial stiffness K of the metal bellows expansion joint and its assembly structur...

AI Technical Summary

Problems solved by technology

[0012] 1. Conventional fixtures for tensile tests are often used to clamp general metal standard size bars, pipes, and plates, such as Φ10mm*55mm round bars, and the size range (such as diameter, thickness, etc.) of the workpiece to be clamped is usually At 0-14mm, the metal bellows expansion joint and its assembly structure sample can be approximately regarded as a hollow cylinder, and the diameter is usually above 30mm, which cannot be clamped by general fixtures

[0013] 2. Conventional fixtures used for tension / compression experiments do not have air intake holes and sealing designs, so they cannot inflate and pressurize the inside of the workpiece, and cannot measure the axial and transverse belts of metal bellows expansion joints and their assembly structures. Compressive stiffness

[0014] 3. There is no suitable fixture to use the universal testing machine to measure the lateral stiffness of the metal bellows expansion joint and its assembled structure

[0015] 4. Due to the high precision of the connection between the universal testing machine and the fixture, the assembly is relatively tight. The existing commonly used fixture connecting columns are designed to be complete and uniform cylinders. The processing accuracy of the mating surface is high, and the assembly is often not smooth. Phenomenon

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