Free-fall impact fatigue testing machine

Abstract

The invention discloses a free-fall impact fatigue testing machine which comprises a supporting mechanism and a punch hammer mechanism. The punch hammer mechanism is fixed to a ball screw of the supporting mechanism and comprises a round wheel assembly and a punch hammer assembly. According to the testing machine, the round wheel in the round wheel assembly is in periodic contact fit with the L-shaped plate during rotation to drive the punch hammer assembly to ascend and descend freely, and impact fatigue is achieved; by adjusting the mass of weights in the punch hammer assembly and setting the lifting height of the punch hammer mechanism, accurate impact energy quantitative characterization of the free falling body kinetic energy of the punch hammer is achieved. By adjusting the weight mass and the impact stroke, the setting of any impact energy value within the range of hundreds of J is realized, and the precision can reach 0.1 J; and through round wheel driving, the impact frequencyreaches 1 Hz or above. Therefore, the testing machine disclosed by the invention can meet parameter requirements required by various impact fatigue experiments, is high in precision, convenient to adjust different impact energy, compact in structure and simple and convenient to operate.

Description

technical field [0001] The invention relates to impact fatigue test equipment, in particular to a free-fall impact fatigue test machine. Background technique [0002] Existing impact fatigue testing machines usually adopt: (1) the cam-link structure realizes multiple impacts, such as the Chinese patent whose publication number is CN202748210U. This structure drives the cam to rotate through the motor, and then the cam drives the linkage mechanism to move up and down to realize multi-stroke; the linkage mechanism is affected by the cam during the downward movement, and the impact process is not a complete free fall movement. To calculate the impact energy, the measurement is inaccurate and the experimental error is relatively large; at the same time, the impact energy in this way can only be preset in certain gears, and the impact load cannot be flexibly adjusted according to actual needs. (2) Multiple impacts are achieved by pneumatic lifting and electromagnet attraction an...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of accurate measurement of impact energy, flexible adjustment of impact load, and high impact frequency in the prior art, the present invention designs a free-fall impact fatigue testing machine, which adopts the matching design of a round wheel and an L-shaped plate , when the round wheel rotates, the lifting block on the round wheel will periodically contact and disengage from the L-shaped plate on the hammer assembly, and so on and on. With the periodic rotation of the round wheel, the lifting block will drive the hammer assembly to lift periodically and then Free fall to complete the impact fatigue test on the sample

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