Device for measuring dynamic change of friction static electricity and friction property of insulating material

Abstract

The invention discloses a device for measuring dynamic change of friction static electricity and friction property of an insulating material. An electrostatic potential sensing head (1) of a vibration capacitance type electrometer (4) is horizontally placed on a friction abrasion test machine (27) which rotates horizontally, so as to monitor the dynamic change of the friction electrostatic potential of a working surface of a sample (18) to be tested, and lay a signal into a computer; a friction sensor (12) is connected in the tangential direction of a loading sleeve rod (11), and is used for inputting an obtained friction signal of the sample (18) to be tested into the computer through a friction transmission line (13); the temperature change of the working surface of the sample (18) to be tested can be monitored; a glass sealing shade (37) is installed on a base disc (35) through a sealing groove (36); and the sealing groove (36) ensures that the good air tightness between the glass shade (37) and the base disc (35) is achieved. A test platform for accurate measurement is provided for revealing the principle of electrification by friction and analyzing the influencing factor of the friction electrostatic potential of the insulating material.

Description

technical field [0001] The present invention relates to different friction forms or contact forms of the friction pair (such as sliding friction or rolling friction; point contact, surface contact or line contact), different PV values ​​(P is the applied load, V is the speed), different humidity It is a device for measuring the friction electrostatic potential, friction coefficient and friction surface temperature of insulating materials changing dynamically with time under various complex coupling conditions such as different temperature atmospheres and different environmental media (atmosphere, vacuum, oxygen, inert gas, etc.), especially involving It is a device that can measure the dynamic changes of frictional static electricity and frictional performance parameters of insulating materials under various complex conditions. Background technique [0002] When two materials are in contact, rubbed and separated again, each material will have an excess positive (or negative)...

AI Technical Summary

Problems solved by technology

Although GB / T 12703-91 can preliminarily investigate the maximum frictional static voltage and electrostatic charge of textile fabrics, it also has the disadvantage that the voltage sensing electrode can only sense intermittent frictional static voltage. This alternating induction seriously affects the frictional static voltage. Accuracy of measurement; In addition, due to the simplicity of the device, it is impossible to realize the cross research of the friction pair contact form, PV value and environmental medium

Therefore, it is obviously difficult to use this device to study the tribostatic mechanism of materials.

Other standards such as SJ / T 10694-1996 and FZ / T 01061-1999 not only have the same shortcomings as the above-mentioned equipment, but also SJ / T 10694-1996 uses manual one-way friction and manual reading, which makes it impossible to accurately obtain friction The purpose of static voltage

Zhang Guozhen and others designed a friction and wear tester for ball-disk contact (invention patent No. 200720104137.7) and a friction and wear tester for vacuum and low temperature environments (invention patent No. 200720149289.9), but the equipment did not The function of measuring tribostatic voltage or static charge is only a single friction motion mode of steel ball-disc sliding friction, and there is no function of measuring dynamic changes in friction surface temperature

As we all know, the friction coefficient and wear rate of rolling friction are extremely low, and compared with sliding friction, rolling friction has its particularity, but there is no equipment at home and abroad that can measure the dynamic change of tribostatic potential of materials under rolling friction No relevant research literature reports were found

And whether it is rolling friction or sliding friction, changes in speed and load (PV value), humidity and temperature atmosphere, and environmental media (atmosphere, vacuum, oxygen, inert gas, etc.) will definitely affect the chemical structure, physical and chemical properties and electronic escape of materials. This will also be reflected in the changes in the tribostatic potential and tribological properties of the material. However, there is no equipment at home and abroad that can measure the dynamic change of the tribostatic potential of insulating materials under different PV values ​​and environmental media. , and the tribostatic potential of the material is closely related to its tribological properties. Therefore, when studying the triboelectric mechanism of materials, it must be analyzed in relation to its tribological properties, which puts forward higher requirements for the multifunctionality of the equipment.

In addition, the conventional friction testing machines currently available on the market are not only unable to realize the conversion experiments of ball-disc contact sliding friction, pin-disc surface contact sliding friction, and rolling friction, but more importantly, they do not have the function of measuring tribostatic voltage or electrostatic charge, and cannot There is no function to measure the dynamic change of friction surface temperature

Images