Fatigue test device for compression spring

Abstract

The invention relates to a fatigue test device for a compression spring. A spring sleeve is arranged in the center of a base of the device; two threaded rods and two limiting screws are uniformly distributed on the periphery of the base; the heights of the limiting screws are less than those of the threaded rods; the upper part of the spring sleeve is sleeved with a loading support; a pretightening compression rod is arranged in the spring sleeve in a threaded connection manner; the lower part of the pretightening compression rod is in movable fit with the bore of the spring sleeve; the upper part of the pretightening compression rod extends out of the loading support; the outwards extending part is sleeved with a loading weight; the tops of the two limiting screws correspond to the bottom face of a seat plate of the loading support; the pretightening compression rod is adjusted to allow the loading support to move downwards; and when the bottom face of the seat plate of the loading support is contacted with the tops of the two limiting screws, the loading support stops moving downwards. With the adoption of the fatigue test device, a fatigue test cycle of the compression spring is shortened greatly; when a vibrating overweight loading mode is adopted for test, the set frequency is 20Hz, namely 20 times per second; and the tests only cost 27.8h when 2 million tests are conducted as required.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a fatigue test device for a compression spring. Background technique [0002] At present, most compression spring fatigue tests are driven by cylinders, that is, when the piston rod of the cylinder is stretched out, the spring is compressed, and when the piston rod is retracted, the spring rebounds and resets. One cycle of piston rod expansion and contraction is counted as one compression spring test. This test method has the following defects: 1. The cylinder action response is relatively slow. At present, the action frequency of the test is generally 30 times / min. For the required test of 2 million times, the test only takes 1111.1h without considering the disassembly and inspection, that is, 46.3 Days, the test period is too long. 2. The manufacturability and economy of the test are poor. Contents of the invention [0003] In order to solve the...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of long fatigue test period of the compression spring, the present invention does not use the cylinder driving mode, and provides a fatigue test device for the compression spring with good economy and manufacturability

Images