SU1213376A1 - Method of inspecting compaction of loose material - Google Patents

Abstract

The method of controlling the compaction of bulk material can be applied in powder metallurgy and in the technology of building materials. The method consists in exciting oscillations of the vessel with the bulk material placed in it. The vessel is set on an elastic suspension, the vibration is reported to it at a resonant frequency, and the excitation amplitude is monotonously increased. The ratio of the amplitude of the oscillations of the vessel to the amplitude of the excitation is measured, and the compaction is determined by the magnitude of the critical amplitude of the excitation corresponding to a sharp decrease in this ratio. 1 il. i (L 00 O)

Description

Pf 1breeing refers to methods for determining the density of bulk materials and can be used in powder metallurgy, in building materials technology.

The purpose of the invention is to improve the measurement accuracy.

The drawing shows a device that implements the proposed method.

The device consists of a vessel 1 with a bulk material mounted on an elastic suspension 2 connected to a vibrating table 3, which is driven by a drive 4. The sensors measuring the accelerations of the vessel 5 and the vibrating table 6 are connected to the gain determination unit 7.

The proposed method is carried out as follows.

The test vessel 1 is set using an elastic suspension 2 on the vibrating table 3; The amplitude of the vibrating table is set to the minimum value. Change the frequency of vibration adjust the system to resonance. Smoothly increase the amplitude of excitation: at the same time, the amplification factor is measured:

K - with l - -. ,

Ag,

where AC is the amplitude of oscillations of the vessel A 5 is the amplitude of oscillations of the vibrating table.

At a certain amplitude A, there is a sharp decrease in the gain. This amplitude value, hereinafter referred to as critical, is compared with the reference one and the density of the bulk material is determined by its value. The greater the density of the material, the higher the value of the critical amplitude.

The sharp drop in the coefficient of gain is associated with the destruction of the internal

3376

her structure of compacted bulk material, provided:

F ,,

tr

but

Where

Mi

- inertial force acting on a particle of material; and GDP - according to force

friction and adhesion, keeping the particle in a stationary state relative to other particles.

As a result of the destruction of the structure, the energy loss of the oscillations in the vessel increases due to the occurrence of significant movement of particles and an increase in internal friction in the material, which reduces the gain.

The application of the proposed method will significantly improve the accuracy of measurements of the density of compacted material (degree of compaction) by using the resonant mode of vessel excitation.

Claims (1)

Invention Formula A method for controlling the compaction of a bulk material, which consists in exciting oscillations of a vessel with a bulk material placed in it, about t - l and h with the fact that, in order to improve the accuracy of measurements, the vessel is mounted on an elastic suspension, vibration impact with a resonant frequency and monotonously increase the amplitude of the excitation, measure the ratio of the amplitude of oscillations of the vessel to the amplitude of excitation, and compaction is determined by the magnitude of the critical amplitude of excitation corresponding to a sharp decrease indicated CSO relations. /////////////////// 7777/7777