SU1192856A1 - Method of excitation of oscillations of dividing liquid in the jigging machine - Google Patents

Abstract

METHOD oscillation drive isolation ZHVDKOSTI in jigs, based on the excitation of low frequency and high frequency components of the vibrations by means of a periodic admission and vshuska compressed air, characterized in that, in order to reduce: energozat- rat for the excitation of oscillations of the separation fluid inlet and a compressed air outlet control pulses are formed with independently varying pulse frequency in the packs and the pulse repetition rate, while the pulse frequency of the pulse bursts is It tunes the low-frequency component of the oscillations, and the frequency of the pulses in the packet - the high-frequency component of the intake and exhaust oscillations. compressed air and oscillations are stripped (Pillow fluid. ifflK pg

Description

The invention relates to the beneficiation of minerals by the method of jigging and can be used at the beneficiation plants of coal and mining ttpp.

The purpose of the invention is to reduce energy consumption for the excitation of vibrations of the separation fluid.

The drawing shows an example of a device for carrying out the proposed method.

The jigging machine 1 has an air chamber 2 connected by air with a pulsator 3. The pulsator includes inlet valve 4 and outlet valve 15 inlet valve 5, Mechanisms 6 and 7 of movement of valves 4 and 5 are actuated by switching devices 8 and 9 controlled by the generator 10 signals of forced oscillations. 20

The method is carried out as follows.

Enrich coal slime with a particle size of up to 3 mm. The source material is fed to the jigging machine 1 sieve. Assigned parameters of the air mode are the main (low) oscillation frequency 40 count / min, cycle 55-45, where 55 is the intake time tgj, as a percentage relative to the cycle time tц, 45-time tzo as a percentage relative to t.

Additional frequency (high) at the inlet col / min, at the outset col / min.

. The generator 10. signals of forced oscillations produces a stack of four pulses, each with duration t on the switching-on inlet device 8, which with the help of mechanism 6 moves so many times the intake valve 4 withdraws and closes the number of pulses in the packet. Thus, the compressed air enters the air cavity 2 during the intake time tgf, a separating fluid, for example water, is displaced in portions and portions of chamber 2 in portions 2. The displaced water forms an upward flow at a rate varying in accordance with the number of 50 impulses of pulses in the packet. As a result, the material on the sieve is loosened, separated in density and size, and a four-fold change in the flow velocity reduces the forces 55 of the mechanical interaction of the particles. one to the other, which improves the efficiency of the separation process.

Then, the generator 10 of the signals of forced vibrations entails a stack of three pulses per switching device 9 of the exhaust valve 5, which respectively opens and closes three times during the time t,. In this case, the air from the air chamber 2 is exhausted in three portions; a downward flow of water is formed at a rate varying in accordance with the number of pulses in the packet. The material goes into a compacted state, and a recurring change in the flow velocity reduces the forces of the mechanical interaction of the particles with each other.

The cycles are repeated and, under the influence of vibrations, the enrichment of coal is divided into layers of different densities.

Bench testing of coal sludge enrichment with the indicated parameters of the depositing mode proved an increase in the code of concentrate by 0.2% from the initial one due to the reduction of its losses with the enrichment waste compared to the deposition modes without excitation of modulated oscillations.

Different materials of different sizes have their own optimal modes, characterized by the frequency of the main and additional vibrations (low and high frequency) and cycle, which are determined by the number of pulses in the packet and the duration of each pulse. The number of pulses in packs for air inlet and outlet, their duration and duty cycle can be obtained either as a symmetric or asymmetrical cycle of movement of the separation fluid in the jigging machine. The frequency of the pulses following the physical properties of the enriched material can vary from 30 up to 300 count / min (0.5-5 Hz), while the period of the following bursts of pulses will be 1 20, 2 s,

and the duty cycle of pulse bursts

t4 tu.

- 1.43-3.33

9 tan (0.3-0.7tc)

taking into account that the intake time in the commonly used modes is 1 "(0.3-0.7) Hz. The maximum possible number of pulses in a burst is determined by the speed of the air distribution system, and the optimal number of pulses at the inlet and at the peak is determined by 31928564

It is done experimentally, according to the techno- logy, with less energy and logical indicators of the operation of the machine. relative constructive simplicity. Using the invention allows, by stabilizing the cycle of the pret cycle, to provide a wide range of variations in the efficiency of the separation of the mapping of the operating modes of the jigging material in the machine.

Claims (1)

METHOD FOR EXCITING SEPARATING LIQUID VIBRATIONS IN A DEPOSITION MACHINE, based on the excitation of low-frequency and high-frequency components of vibrations using periodic inlet and outlet of compressed air, characterized in that, in order to reduce the energy consumption for excitation of vibrations of the separation liquid, the inlet and outlet of compressed air is formed by control pulses independently changing the pulse frequency in the packets and the pulse train repetition rate, while the pulse repetition rate generates neither -frequency component of the oscillation, and the pulse frequency in a pack - high frequency component of oscillations admission and release of compressed air and liquid separating oscillations. _na SU _nu 1192856>