Fatigue experiment device based on engineering mechanics

Abstract

The invention provides a fatigue experiment device based on engineering mechanics. The fatigue experiment device includes a disc body. A cam is arranged in the middle of the disc body. The cam is connected with a motor shaft. A T-type chute is arranged in the ridge of the cam. Multiple sliders are connected in a sliding manner to the T-type chute. Each slider is connected with a spring fatigue experiment connecting mechanism. Each spring fatigue experiment connecting mechanism includes a movable connecting body and an adjustable-length fixed connecting body. A tested spring is connected between each fixed connecting body and the corresponding movable connecting body. Each movable connecting body is connected with the corresponding slider. The middle of each fixed connecting body is correspondingly connected with a tension and pressure sensor. The tension and pressure sensors are in signal connection with an industrial personal computer through a microprocessor. Fatigue experiment can be carried out on a plurality of springs or springs of a variety of specifications simultaneously, and the test efficiency of spring fatigue experiment is greatly improved. Moreover, the force condition of a detected spring in experiment can be fed back in real time, and automatic operation of the whole test process can be realized.

Description

technical field [0001] The invention relates to the field of fatigue resistance experiments of mechanical parts, in particular to a fatigue resistance experiment device of engineering mechanics. Background technique [0002] Spring plays a pivotal role in engineering mechanics. It is a mechanical part that uses elasticity to work. Parts made of elastic materials are deformed under the action of external force and return to their original shape after removing the external force. When the spring is working, the force it receives It changes frequently. Under the action of alternating stress, although the stress it bears is lower than the yield point of the material, the phenomenon of cracks or sudden complete fracture after a long period of work is called metal fatigue, even if the spring It is not broken, but due to the long-term stress, the expansion and contraction of the spring cannot be completely reset, and some work cannot be completed, resulting in equipment failure. Th...

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Problems solved by technology

[0002] Spring plays a pivotal role in engineering mechanics. It is a mechanical part that uses elasticity to work. Parts made of elastic materials are deformed under the action of external force and return to their original shape after removing the external force. When the spring is working, the force it receives It changes frequently. Under the action of alternating stress, although the stress it bears is lower than the yield point of the material, the phenomenon of cracks or sudden complete fracture after a long period of work is called metal fatigue, even if the spring It is not broken, but due to long-term stress, the expansion and contraction of the spring cannot be completely reset, and some work cannot be completed, resulting in equipment failure, so fatigue tests are required for different batches of springs

[0003] The spring fatigue testing machine is a kind of testing equipment used to evaluate the service life of springs. The existing spring fatigue testing equipment has a wide variety of testing methods, such as the linear reciprocating compression spring, the frequency is relatively low, the test time is long, and it is difficult to To achieve the purpose of quickly detecting the service life of the spring; in addition, the existing testing equipment for the service life of the spring is also difficult to perform fatigue tests on multiple springs and springs of various specifications and series at the same time, thus greatly reducing the efficiency of the spring fatigue test ; In addition, it is also difficult for general spring service life testing equipment to provide real-time feedback and detection of the test force of the spring and to realize the automatic operation of the entire testing process

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