Impact force detection mechanism

Abstract

The invention provides an impact force detection mechanism based on Galfenol alloy. The impact force detection mechanism comprises a base, a detachable module arranged on the base and a Galfenol beam connected to the base through a thread. The Galfenol beam is the main body of the detection mechanism. The tail part of the Galfenol beam is closely attached to a permanent magnet. A signal extraction coil is arranged in the middle part of the Galfenol beam. The end part of the Galfenol beam is closely connected with a force transmission rod. A force applying module is connected to the force transmission rod. A limiting boss arranged on the base is arranged at the bottom of the force transmission rod. The exterior of the permanent magnet is wrapped in a damping layer. The permanent magnet is arranged in a cavity between the base and the detachable module. The detection mechanism is simple in structure, easy to install and capable of achieving measurement impact load. In addition, the Galfenol beam as the detection main body is of a cantilever structure, so flexibility of the detection mechanism can be effectively improved.

Description

technical field [0001] The invention relates to an impact force detection mechanism based on Galfenol alloy (Fe-Ga alloy). The main body of the detection mechanism adopts a cantilever beam structure to improve the sensitivity of the detection mechanism. Realize the detection of external impact force. Background technique [0002] Impact force is the force that occurs when objects collide with each other. In the process of collision or impact, the force between objects that suddenly increases and then disappears rapidly is also called impulsive force or collision force. The impact force is a transient phenomenon, which is characterized by a very short acting time, but the magnitude value can reach a large value. The shock vibration generated by the impact force has a crucial impact on the reliability, stability and life of the mechanical parts. The detection of the transient response process of the impact force is an important topic in modern industrial production and advan...

AI Technical Summary

Problems solved by technology

There are two traditional force detection methods, namely strain force detection and piezoelectric force detection. The former uses the change of resistance value caused by stress to detect, but this method requires high assembly accuracy of strain gauges and the linear working range is small. , the dynamic response is poor; the latter uses the piezoelectric effect of the material for force detection, but the piezoelectric material is brittle and cannot measure large stresses, and the value of the impact force is generally large, which greatly limits the piezoelectric material. Application in impact testing

Magnetostrictive force sensing technology is a relatively new type of force detection technology, a typical representative of which is based on giant magnetostrictive materials (GMM, brand Terfenol-D), but like piezoelectric materials, Terfenol-D is also relatively brittle , unable to withstand large loads, and is not suitable for testing the impact force

[0004] The above detection methods all limit their application in impact testing due to the brittleness of the material or the problem of its own strength.

Due to the high brittleness of the above materials, the impact force cannot be directly applied to these materials, but the size of the impact force is measured by indirect detection. During the measurement process, a special protection mechanism needs to be designed for supporting work, so that the sensor The structure is complicated

Images