Small hydraulic shock absorber impact test method and device

Abstract

The invention discloses a small hydraulic shock absorber impact test method and device, which are characterized by the following steps: firstly, the hydraulic shock absorber is vertically and fixedly arranged, and its buffer rod is vertically upward; On the line, set the impact load at the set height above the hydraulic buffer; then impact the impact load on the hydraulic buffer in a free fall manner as a drop weight; use a high-speed camera to obtain the amount of the hydraulic buffer during the buffering process. Finally, for the obtained images, the dichotomy method is used to analyze and count the number of pictures taken during the buffering process, and the buffer time of the hydraulic buffer is obtained by dividing the number of pictures by the shooting frame rate of the high-speed camera. The invention further obtains the actuation time of the mechanical system by measuring the buffering time of the small hydraulic buffer, thereby judging the buffering performance of the hydraulic buffer. The method is simple and the test result is accurate.

Description

technical field [0001] The invention relates to a test method and device for buffer performance of a hydraulic buffer, in particular to a drop-weight impact test method and device for measuring the buffer time of small hydraulic buffers such as RB0604, RJ0805 and other series. Background technique [0002] In mechanical transmission and fluid transmission, impact phenomenon often occurs. For example, the high-speed reciprocating cylinder piston rod will have a great impact on the cylinder head at the end of the stroke. When the buffer capacity inside the cylinder is insufficient, a hydraulic buffer needs to be installed outside to avoid the reduction of the service life of the cylinder. For an excellent hydraulic buffer, its buffer performance needs to be matched with the external mechanical system to minimize the impact of the mechanical system, so as to improve the smooth operation and service life of the mechanical system. For this reason, it is necessary to develop a te...

AI Technical Summary

Problems solved by technology

Velocity, acceleration and force are relatively abstract data, the difficulty factor of the test is high, it is difficult to be accurate, and various mathematical models and simulation software are used, the test process is complicated

Displacement is relatively easy to measure and accurate, but it is still not intuitive enough to reflect the cushioning performance of the buffer

[0004] In addition, in the hydraulic buffer performance test device in the prior art, the lifting device of the hydraulic buffer adopts a servo motor plus a screw drive when lifting, and uses an electromagnetic chuck to control when releasing. During the test, when the piston rod of the hydraulic buffer reaches the end of the stroke, the impact load hits the limiter part of the buffer, resulting in deviations in the detection results during the repeat test, which affects the service life of the buffer

The measurement and control part of the test device takes the industrial control computer as the core, and sets various sensor devices such as force sensors, optical fiber sensors, and laser displacement sensors for testing, and cooperates with various circuit modules to realize the conversion of input and output signals. Such a measurement and control method The process is complicated and the accuracy is difficult to guarantee

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