SU1286298A1 - Hydraulic screen - Google Patents

Abstract

The invention relates to the field of mineral processing in the process of washing, classification and dewatering and is intended for the separation of materials by. size in the aquatic environment. The purpose of the invention is to increase the productivity of the screen and to improve the quality of separation into fractions by ensuring the cleaning of the sieve. For this, the floating bodies (PT) 8, connected between themselves and the walls of the water-filled bath 1 through flexible connections, are placed under the submerged section of the inclined CSi sieve 2. Under the action of a perturbing sy-

Description

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The ly generated by the vibrators 7, the sieve 2 rigidly fixed in the box 3, makes harmonic oscillations. Since the PT 8 system has no connection with duct 3 and the oscillation frequency of the PT 8 is different from the oscillation frequency of the sieve 2, the impact of the sieve 2 on the PT 8 occurs. As a result of the impact, the elastic deformation occurs in the grate 2 of the sieve 2. As a result, the buoyant force acting on the particle being stuck, is

The invention relates to devices for the separation of materials by size in an aqueous medium and can be used in the enrichment of minerals in technological processes of washing, classification and dewatering.

The purpose of the invention is to increase the performance of the screen and improve the quality of separation into fractions by ensuring the cleaning of the sieve.

Fig L schematically shows the hydro, the section; figure 2 - section aa in figure 1; figure 3 - section bb in figure 1; FIG. 4 shows a floating body, an incision; figure 5 - mount a floating body.

The hydro sounding screen consists of a bath 1 filled with water, a sieve 2 partially immersed in an aquatic environment of the bath and rigidly connected to the duct 3, which is suspended on springs 4 and rests on springs 5. To unload the above-resolute product, the discharge tray 6 is attached to the duct 3 A self-balancing vibrators 7 are rigidly fixed on the box 3. A system of floating bodies 8 made, for example, of hollow metal, plastic or wooden balls, is placed under the flooded area of the screen 2. To change the buoyancy of the floating bodies 8, a check valve is mounted in each of them in the lower part, which is a rod 9 with a spring 10 resting on the bracket 11 attached to the ball body. A non-return valve allows the internal cavity 12 of the floating body to be filled with water. Floating body 8

It is not the strength of the peace training, but the lesser magnitude of the rolling force. The stable position of the PTB is provided by displacing the center of mass of them in the direction opposite to the point of contact of the PT 8 with the sieve 2. To change the buoyancy of the PT S, each of them is hollow and equipped with a check valve to communicate the external cavity with the external environment. 1 hp f-ly 5 Il.

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They are located under the sieve 2 in the P1Ahmat order so that the cleaning zone 13 of each body overlaps the adjacent ones. The floating bodies 8 are connected to the walls of the bath 1 and to each other through flexible connections 14. In the static position of the floating body 8, they are pressed with a lifting force to the bottom surface of the sieve 2. A branch pipe 15 is located in order to unload the undersize product.

Hydro roar works as follows.

Under the action of the disturbing force created by the vibrators 7, the sieve 2, rigidly fixed in the box 3, makes harmonic oscillations. The material entering the sieve 2 is subjected to active mixing and loosening in the vibrocall mode, which contributes to effective separation and intensive flow through the sieve of the fines fraction, which falls into bath 1 and then is unloaded through the stratum tube 15. The large fraction is transported through the system into the side of the discharge chute 6. Since the floating body system 8 has no connection with the duct 3 and the frequency of their oscillations differs from the oscillation frequency of the sieve 2, the sieve 2 strikes the floating body 8. Due to the impact in the grates elastic deformations occur.

As a result of the summation of the inertial forces and the deformation of the grid bars of the screen, the pushing force acting on the particle stuck between the grid bars overcomes not the frictional force of rest, which takes place with undeformed grid bars, but a much smaller force of rolling the fixed particles, t .e, cleaning the sieve is effective.

The energy of impact of a floating body, which is indestructible on a sieve, depends on the “rank of the buoyancy of the floating body, and

also amplitudes and frequencies of disturbing oscillations. Adjusting the optimal operating mode of the shock system is done by changing the buoyancy of the floating bodies 8 by filling their internal cavity 12 with water through a check valve.

Dp to ensure a stable position of the floating body 8 and to avoid impact of the stem 9 of the check valve on the sieve 2, the center of gravity of the floating body is shifted to the side opposite to the point of contact of the body with the sieve due to the valve weight.

The attachment of the floating body system 8 is carried out by means of flexible connections 14 to the bath of screen 1, which makes it possible to eliminate the negative impact of

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outside the oscillating mass of the shock system on the dynamic mode of operation of the hydro screen.

Claims (2)

1. A hydraulic screening machine comprising a vibratory drive, a bath filled with water, a box with a fixed inclined sieve partially immersed in the bath, and a system of floating bodies connected between themselves and the walls of the bath by means of flexible connections, characterized in that In order to improve screening performance and improve the quality of separation into fractions by ensuring the cleaning of the sieve, the floating bodies are placed under the submerged portion of the sieve, while the center of mass of the floating bodies is shifted to the side opposite to the point of contact of the bodies with the sieve. 2. The hydraulic screening apparatus of claim 1, wherein the floating bodies are made hollow and equipped with non-return valves for communicating the internal cavity with the external environment. five 0 five Iff -fig 2 Bv fi (.3 T / " (. five 72