SU804005A1 - Hydraulic screen - Google Patents

Description

The invention relates to devices for the separation of materials by size in the aquatic environment and can be applied in the beneficiation, chemical, electrical engineering industry, in the construction of building materials. A vibrating screen for separating fine-grained materials is known, consisting of a bath, a vibrating screen, the working surface of which is partially immersed in a liquid and resting on several bond beams that are also in the liquid. The rolls of communication have an elongated cross section and are located under or above the sieve and have on the side facing the surface of the sieve two or more cam-shaped protrusions in such a way that there is 1 length between the beam and the sieve. The production of the lower classified product at the screen is carried out with 1J water. The disadvantages of this vibrating screen include insufficient separation efficiency and low productivity. Vibro-wet for wet screening is known, which contains a sieve rigidly connected to the box and immersed in a water bath, an eccentric drive and a device for cleaning the sieve 2. With good separation quality of the material by size, said screen has low productivity, depending in particular on the speed of transporting the positive product under a layer of liquid, which is lower compared to the speed of transporting in air. To increase productivity at the screen, the flow rate of fine particles under the sieve should also be increased. The aim of the invention is to improve the performance of the screen. This is achieved by the fact that elastic plates with inverted V-shaped elastic valves attached to them with a certain gap each relative to each other, which is chosen from the condition of opening the valves and forming a solid broken sheet over the sieve, are mounted on the screen perpendicular to the vibrating surface of the sieve. during their antiphase movement with respect to the sieve / and with the elastic plates attached to a common spring-loaded base / tuned to the frequency of the dynamic damper oscillations . As a result, in the zone formed by the internal surfaces of the valves and the surface of the sieve, there is a cyclic (for each oscillation period) increase in the hydrodynamic pressure, which increases the throughput of the sieve and thereby the productivity of the screen.

Figure 1 shows the roar, a general view, in section 5 in figure 2 - the same, side view; on fig.Z - valve mounting.

The screen consists of a bath 1 filled with water, a sieve 2 immersed in it, rigidly connected to box 3, which in turn is suspended from springs 4 and rests on springs 5. To unload the positive product, sieve 2 is rigidly attached to the sieve 2. The self-balancing vibrators 7 transmit the vibrations to the duct 3 with a sieve 2. Elastic plates 8 with fastened at their ends, for example by means of J. -shaped plates 9, are fitted with elastic valves 10 of an inverted V-shaped formula mounted on a bottom spring of 5th base 11. The structure, which is suspended on the springs 12 to the beams, connecting them is m 13 of box 3.

Gidrogrokot works as follows.

Under the action of self-balancing vibrators 7, the sieve 2 and the box 3 perform harmonic oscillations. These vibrations create a directional movement of the material along the surface of the screen 2 from under the water layer. When this occurs, the separation of the material into a positive product, directed to the discharge tray b, and negative, going to the drain. The elastic valves 10 transport the energy of the oscillating flow to a dynamic head in the direction of the sieve 2. In this case, one part of the energy of the oscillating flow is transferred in the direction of transport of the positive product under a layer of water along the surface of the sieve 2 / a

the other in the direction of passage of the particles through the slots of the sieve 2.

The mechanics of the process of oscillations of an elastic valve can be explained as follows. In the direction of movement of the positive product, the oscillating sieve also carries some mass of water, which, in its movement, imparts potential energy to the elastic plate and valve. The valve in turn, open, transmits

0 additional energy to the driving pulp flow in the direction of the discharge chute 6. Similarly, an increase in the flow rate of the pulp through the slits of the sieve occurs, which is carried out by

5 impact systems i elastic valves inverted V-shaped. The advantages of using the proposed screen are achieved by placing a valve system intensively working on the pulp over the surface of the sieve, namely: catching productivity, increasing the yield of the main product of classification and increasing the efficiency of a fine wet screening.

Claims (2)

1. A hydraulic screen, including a frame, a box with tie beams and a system installed in it, a bath with water and a vibration drive, characterized in that, in order to increase the performance of the screen, resilient plates with attached plates are installed perpendicular to the screen. to them elastic valves inverted V-shaped. 2. A hydraulic screening apparatus according to claim 1, characterized in that the elastic plates are fixed on a common base of scientific research institutes, which is associated with the coupling springs. Sources of information taken into account in the examination 1. The patent of Germany ff 1020501, J cl. 1 a 13, pub. 1958. 2. Authors certificate of the USSR M 485783, cl. B 07 B 1/00, 1973.