Clutch diaphragm spring parameter test system based on virtual instrument

Application of VI in Parameter Testing of Clutch Diaphragm Sprin g

LIU Cunxiang1, LIU Xuejun2

(1.Guangxi Communication Vocational&Technical Institute, Nanning 5300 23, China;
2.Jinan Shidai Shijin Instrument Co,Ltd. Jinan 250022, China)

Abstract: The article introduces the basic theory and composing of the diaphragm spring parameter test system based on VI. And at the same time, the author also explains how the system's hardware and software designs and wo rks.
Keywords: virtual instrument; diaphragm spring; parameter testing

1 System hardware design
The overall structure of the test system is a portal structure. A hydraulic system is installed on the workbench to achieve automatic control (Figure 1). The test system hardware mainly consists of a workbench, a crossbeam and a column to form its loading frame. The loading frame is supported on the box assembly. The loading cylinder is fixed in the box under the workbench, and its piston rod passes through the workbench. The lower pressure head is fixed on the piston rod of the loading cylinder, and its range of motion is adjusted by the travel switch. The upper oil cylinder is fixed on the adjustment screw, and the adjustment screw is fixed on the crossbeam by two nuts. The upper pressure head is connected to the adjustment screw through the oil cylinder and the force sensor. The adjustment screw can be adjusted up and down according to the space required by different types of springs. The displacement sensor A fixed on the lower part of the oil cylinder is used to measure the overall deformation of the spring when it is axially stressed. The three displacement sensors B1~B3 on the workbench are used to measure the deformation of the large end of the spring. The force sensor is used to measure the load applied to the diaphragm spring. The five sensor signals are transmitted to the data acquisition card after being processed by the signal conditioning circuit. After being processed by Labview (virtual instrument software), two important characteristic curves of the diaphragm spring are obtained: the load characteristic curve and the separation characteristic curve. According to actual needs, the characteristic points of the clutch cover assembly parameters are given on the system operation interface so that engineering and technical personnel can judge the working performance of the clutch.

(1) The principle of load characteristic measurement is to place the spring on a workbench, and the workbench is supported on the large end face of the spring. At this time, the piston of the upper oil cylinder is at the top dead center, and the loading cylinder moves upward. The upper pressure head presses on the upper support ring of the spring, and the loading cylinder continues to move upward. At this time, the displacement λ1 (displacement sensor A) and pressure P1 (force sensor) of the large end of the spring are measured, and the load characteristic curve (P1-λ1 curve) can be obtained.