High-temperature performance testing device for polyimide bushing with special-shaped end face

Abstract

The invention provides a detection device for the high-temperature performance of the tube wall of a polyimide liner. The detection device comprises a pressure base, a compression test table and a pressure head, wherein the compression test table and the pressure head are fixed to the pressure base. A supporting pressure rod is connected with the compression test table, the compression test table with a transverse adjusting rod is fixed into a rectangular cavity of the pressure base, one side of the compression test table is provided with a pressing baffle and a baffle fixed below the pressing baffle and used for clamping a sample, and two independent U-shaped pieces in bilateral symmetry are adopted in the baffle and fixed to the two sides of the compression test table respectively through retaining nuts. The transverse adjusting rod penetrates through a center hole of the compression test table to be connected with a tightening nut, the two sides of the transverse adjusting rod are sleeved with pre-tightening springs and two parallel guide rods for adjusting the positions of the pressing baffle and the compression test table, transverse and longitudinal adjustment is conducted on a test article through a center scale mark on the compression test table and parallel displacement of a dovetail guide groove of a rectangular cube, coaxiality is guaranteed, the pressure head presses the middle of a tube body, and therefore the special-shaped end face of the polyimide liner is prevented from being stressed. The detection device is suitable for samples with special-shaped end faces and in any shape.

Description

technical field [0001] The invention relates to a high-temperature performance detection device for a polyimide bushing wall, in particular to a high-temperature compression test device for a polyimide bushing wall with a special-shaped end face. Background technique [0002] At present, polyimide bushings formed directly by injection molding or machined on injection molded blanks are widely used in aviation, aerospace and most high-temperature conditions to avoid direct shaft and seat hole grinding and reduce shaft alignment. damage and protect the shaft. Usually used in the prior art image 3 , Figure 4 As shown in the polyimide bushing tube body failure stress test device, Chinese patent announcement number CN204241311U also discloses a "polyimide molded part tube body failure stress test device". The pipe failure stress test device includes a connecting rod (1), a pressing rod (2) and a pressing seat (3) placed on the electronic tensile machine, and the pressing rod (...

AI Technical Summary

Problems solved by technology

The device provided by this patent application can be used to test the high-temperature performance of the polyimide bushing wall, which belongs to the characterization test for the actual performance of the product, and can be used to test the high-temperature performance of the polyimide bushing wall to a certain extent. But the disadvantages are: 1. There are many specifications of polyimide bushings, including different pipe diameters and inner wall thicknesses, especially the large differences in end face size, and even special-shaped end faces.

The versatility of using the above-mentioned test device is poor, and it cannot be tested for polyimide bushings with special-shaped end faces

2. The device uses a fixed limiter to limit the rolling of the bushing during the test, but the limit effect is limited, and it is still difficult to ensure the coaxiality of the pipe body under force

[0003] exist Figure 4 In the shown existing polyimide bushing pipe failure stress test device, the polyimide bushing with special-shaped end face is placed on the pressure seat, and the special-shaped end face of the polyimide bushing with special-shaped end face is close to the press seat. On the side, press the pressure bar on the polyimide bushing with special-shaped end face to apply pressure directly. Since the special-shaped end face of the polyimide bush with special-shaped end face is not fixed, and the body of the polyimide bushing with special-shaped end face is round, The pipe will roll on the pressure seat, and it is easy to cause misalignment when installing the pressure rod, which affects the accuracy of the test results

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