High-low temperature testing clamp
A test fixture, high and low temperature technology, applied in the direction of manufacturing tools, workpiece clamping devices, etc., can solve problems such as changes in mechanical properties, failure of suction cup sealing performance, hardening of suction cup materials, etc., and achieve the effect of easy use
Active Publication Date: 2019-06-07
WUHAN AVIATION INSTR
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Problems solved by technology
In order to facilitate the operation, the vacuum suction cup is selected as the test fixture, but the vacuum suction cup on the market can only provide negative pressure, and the suction cup material will harden under low temperature conditions, resulting in changes in its mechanical properties, making the sealing performance of the suction cup invalid. Meet the test requirements
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[0028] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0029] Such as figure 1 As shown, after the test fixture is fixed on a plane, the first space 3 is isolated from the second space 1 by the first sealing ring 4 , and the second space 1 is isolated from the atmosphere by the second sealing ring 2 . One end of the first sealing ring 4 has a groove that matches the inner ring protrusion of the housing 7, and the other end is a slope, and the direction of the slope is inward (that is, concave and convex); the top of the slope forms an angle of 20° with the horizontal plane ; One end of the second sealing ring 2 has a groove that matches the outer ring protrusion of the housing 7, and the other end is a slope, and the direction of the slope is outward (that is, convex and concave); the top of the slope is 20° from the horizontal plane horn.
[0030] Such as figure 2 and image 3 As shown, the test fixture is ...
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The invention belongs to the technical field of pressure sensors, and relates to a high-low temperature testing clamp. Two independent sealing spaces are designed in the clamp, one sealing space is continuously added with negative pressure through a vacuumizing device to fix the clamp on the test hole position, the other sealing space applies the required positive and negative pressure to the testhole through the pressure controller. According to the high-low temperature testing clamp, the material used by the clamp sealing ring is low phenyl silicone rubber, the sealing performance of the clamp under high and low temperature conditions is ensured, when the clamp is used, positive pressure and negative pressure can be applied to the pressure test hole position, the test clamp does not need to be replaced, and the clamp is convenient to use.
Description
technical field [0001] The invention belongs to the technical field of pressure sensors and relates to a high and low temperature test fixture. Background technique [0002] In the development process of aviation products, it is necessary to apply positive and negative pressure to the test hole of the product under high and low temperature conditions. In order to facilitate the operation, the vacuum suction cup is selected as the test fixture, but the vacuum suction cup on the market can only provide negative pressure, and the suction cup material will harden under low temperature conditions, resulting in changes in its mechanical properties, making the sealing performance of the suction cup invalid. Meet the test requirements. Contents of the invention [0003] The purpose of the present invention is to provide a high and low temperature test fixture, which can apply positive and negative pressure to the test hole in order to meet the requirement of pressurizing the test...
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IPC IPC(8): B25B11/00
Inventor 赵贵新
Owner WUHAN AVIATION INSTR