RU1817007C - Method of determining friction coefficient of disperse materials - Google Patents

Abstract

The invention relates to a testing technique for determining the frictional properties of dispersed materials. The purpose of the invention is to increase the accuracy of determining the friction coefficient depending on vibration parameters. Initially, as needed, the invention relates to a testing technique, namely, methods for determining the frictional properties of dispersed materials. The purpose of the invention is to determine friction coefficient depending on vibration parameters. Figure 1 is a diagram of an apparatus for implementing the method; in Fig. 2 - of the tested power of the electric motor that rotates the counter-sample mounted on its shaft, the moment of resistance of the counter-sample is determined for given fixed vibration parameters applied to the container with the electric motor fixed on it without dispersed material. Then dispersed material is placed in a container with a counter sample and the moment of resistance to rotation of the counter sample is determined for the same fixed vibration parameters, and the friction coefficient value is calculated by the formula i-a.) (M | - Mj) / S, where fi is the friction coefficient value at 1 values of vibration parameters; a) is the rotation speed of the counter-sample, Mi is the moment of resistance to rotation of the counter-sample without dispersed material at 1 values of vibration parameters; M | - the moment of resistance to rotation of the counter sample in the dispersed material, at 1 values of vibration parameters; S is the area of the counter sample located in the dispersed material. 2 ill. Ate the friction coefficient versus vibration frequency. The diagram shows a cylindrical counter-sample 1, the disperse material 2 being studied, an electric motor 3, a measurement unit 4 ,. container 5, vibrator 6. The method is as follows. 00 § 0 xj

Description

A container 5 with an electric motor, on the shaft of which counter sample 1 is mounted, is attached to the stage of the vibrator 6. The electric motor is turned on and the moment Mo of resistance to rotation of the counter sample is determined using the measurement unit for the vibration parameters equal to zero, then the vibrator is turned on and The moments Mi, ..., Mn of the resistance to rotation of the counter-sample at given fixed parameters of vibration are observed. The vibrator is turned off, the disperse material under investigation is poured into the container and the moment M0 of resistance to rotation of the counter-sample is determined, then the vibrator is turned on and the moments Mv ..., Mn, resistance to rotation of the counter-sample are determined for the same given fixed vibration parameters at which the moment Mi was determined. ,. ,, Mn, resistance to rotation of the counter sample without dispersed material. The coefficient of friction of the disperse material on the counter sample without vibration and for given fixed vibration parameters is calculated using the above formula.

Example. A container with an electric motor, on the shaft of which a counter-sample made of steel of the HVG brand is fixed, was attached to the vibrator table of the VEDS-10A vibration stand. The electric motor was turned on and the moment of resistance to rotation of the counter-sample was determined using the unit for measuring power consumption. Then the vibration stand was turned on and the moment of resistance to rotation of the counter sample was determined depending on the vibration frequency at a constant acceleration of 10 m / s. Then the vibrostand was turned off and a bronze powder of grade ОF 10-1 was poured into the container with the counterbrasp and the moment of resistance to rotation of the counterblock in metal powder was determined. After that, the vibration stand was turned on and the moment of resistance to rotation of the counter sample in the metal powder was determined depending on the same values of the vibration frequency at

acceleration 10 m / s2. Coefficient of fr

depending on the parameters of the vibration of the races, read according to the above formula.

Studies have shown

Claims (1)

that the proposed method allows to determine the coefficient of friction between the dispersed material and the counter-sample, depending on the parameters of vibration, Formula of the invention Method for determining the coefficient training of dispersed materials, which consists in rotating the counter-sample at a constant speed in the dispersed material and determining the moment of resistance to rotation of the counter-sample, taking into account which determine the coefficient of friction of the dispersed material, characterized in that, in order to improve the accuracy of determining the coefficient of friction depending on the vibration parameters, pre-rotate the counter-sample with fixed vibration parameters without dispersed material and determine the moments M of resistance to rotation of the counter-sample at 1 parameter values vibration, rotation the counter sample in the dispersed material and the determination of the MG moment are carried out at the same vibration parameters, and the fr coefficient of friction coefficient is determined from the ratio  in ft u) (M j -MQ S ... where I-1.2.3 ...; "Y is the rotation speed of the counter sample; S is the area of the counter sample located in the particulate material. O 50 100 150 200 250 300 350 350 400 450 GHz Figure 2,.: