Fatigue testing machine

Abstract

The invention relates to a fatigue testing machine which comprises a machine base, a valve sheet fixing mechanism, a punching mechanism, a punch driving mechanism and a driving mechanism regulating device, wherein the valve sheet fixing mechanism is arranged on the machine base and is used for fixing a valve sheet; the punching mechanism comprises a punch which has elasticity recovery and is used for exerting pressure on the tongue of the valve sheet by the bottom end; the number of the punch corresponds to the number of the tongue on the valve sheet which is arranged on the valve sheet fixing mechanism; the punch driving mechanism comprises a power device, a driving shaft and a driving wheel; the driving shaft is driven to rotate by the power device; the driving wheel is fixedly connected at the bottom end of the driving shaft; a plurality of cams are arranged on the bottom end of the driving wheel; and the bottom ends of the cams are lower than the top end of the punch. The fatigue testing machine disclosed by the invention has the advantages that the fatigue test on the service lives of the air suction and exhaust valve sheets of a refrigeration compressor is simple and convenient, the test duration is greatly shortened, experiment cost is reduced, and meanwhile development cycle of a new product is shortened and power consumption is reduced.

Description

technical field [0001] The invention relates to a testing machine, in particular to a fatigue testing machine applied to the fatigue testing of valve plates. Background technique [0002] The service life of mechanical parts is one of the main performance requirements of mechanical equipment, especially the life test of a single part, sometimes it takes too long, and some use the accelerated life test method, but the test equipment itself has some new mechanical properties Requirements, such as increasing the speed of the test machine or increasing the force of the test, which is not good for the test equipment itself, but also increases the power consumption of the operation and increases the cost of the test. The suction and exhaust of the refrigeration compressor In the valve life fatigue test, since the service life of the compressor is required to be more than 10 years, for this requirement, the general cam mechanism cannot be used in the fatigue test. For the test of t...

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Problems solved by technology

[0002] The service life of mechanical parts is one of the main performance requirements of mechanical equipment, especially the life test of a single part, sometimes it takes too long, and some use the accelerated life test method, but the test equipment itself has some new mechanical properties Requirements, such as increasing the speed of the test machine or increasing the force of the test, which is not good for the test equipment itself, but also increases the power consumption of the operation and increases the cost of the test. The suction and exhaust of the refrigeration compressor In the valve life fatigue test, since the service life of the compressor is required to be more than 10 years, for this requirement, the general cam mechanism cannot be used in the fatigue test. For the test of the suction valve used in the multi-cylinder compressor, the The life fatigue test is even more difficult to realize. When using the accelerated test, it is difficult for the test equipment to reach the ideal operating speed. Even if its amplitude or frequency is increased, the test result is also different from the actual operation of the refrigeration compressor due to the difference from the actual operation. Large discrepancy

[0003] There is no special test equipment for the service life fatigue test of the suction and discharge valves of the existing refrigeration compressors. Instead, the vibration or single cam structure is used to make the valves move up and down (back and forth), and some are directly installed on the refrigeration compressor to make the compression No matter which method is used, the test cost will increase, and there are some gaps between the test results and the actual operation of the refrigeration compressor.

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