UA126307C2 - Vibrating screen - Google Patents

Abstract

The invention relates to equipment for separation of bulk materials and can be used in mining, construction, metallurgical, chemical and other industries. The vibrating screen comprises a box with a conveying surface, supporting elastic elements, and a vibrating exciter. According to the invention, the working surface has zigzagly arranged discharge windows, above each of which there are profile elements made in the form of a trough, while each of the adjacent profile elements is fixed on opposite longitudinal walls of the box with the formation of a gap between the free end of the profile element and the closer longitudinal wall and the possibility of sinusoidal transportation of the material. The proposed design of the vibrating screen provides the nature of the interaction of the material with the working surface of the sieve, which leads to the rotation of the flow of the sifted material, an increase in the transportation path, a periodic change in the direction of rotation and a sinusoidal direction of movement of the material flow along the entire transportation path, while improving the quality of separation regardless of the properties of the material and, thereby, increasing the efficiency of material separation and screen performance, reducing energy consumption.

Description

The invention belongs to equipment for separation of loose materials and can be used in mining, construction, metallurgical, chemical and other industries.

There is a well-known vibrating screen, which includes a box, elastic elements, a sieve, the surface of which is made in the form of wavy grooves. (ША 20009 0, В0О7В 1/00, 15.01.2007, Bul. Mo 1)

The disadvantage of this solution is that the material has practically no mixing during transportation along the working surface of the screen.

The closest technical solution is a vibrating screen, which contains a box resting on a frame through elastic elements, a single vibrating exciter, a sieve with a working surface in the form of longitudinal grooves along the inner surfaces of the tops of which elastic elements are placed (patent OA 106274 C2, ВО7В1/40, ВО7В1 /46, 11.08.2014. Bul. Mo 15).

The disadvantage of such a solution is the need to locate the shaft of the single vibration exciter in the center of mass of the moving elements, which complicates the design. The need to create circular oscillations of the chute in the transverse plane determines the complexity of adjustment and the stability of the regime.

The design of the sieve does not allow changing the speed of transportation. In the event of a local gust, the mesh must be replaced with a new one over the entire sieving surface. The direction of rotation of the material flow does not change throughout the transportation path, which reduces screening efficiency.

The basis of the invention is the task of improving the vibrating screen, in which the introduction of new structural elements and their interconnection achieves a different nature of the interaction of the material with the working surface of the sieve, which ensures the rotation of the flow of the sifted material, the increase of the transportation path, the periodic change in the direction of rotation and sinusoidal the direction of movement of the flow of material along the entire transportation path, while improving the quality of separation regardless of the properties of the material and, due to this, increasing the efficiency of separation of material and screen productivity, reducing energy consumption.

The problem is solved by the fact that in the known design of the vibrating screen, which contains a box with a working surface that transports, supporting elastic elements, a vibrating exciter, which is distinguished by the fact that the working surface has zigzag unloading windows, above each of which are installed, made in the form of a chute profile elements, while each of the adjacent profile elements is fixed on the opposite longitudinal walls of the box with the formation

From the gap between the free end of the profile element and the nearest longitudinal wall and the possibility of sinusoidal material transportation.

In fig. 1 shows a vibrating screen (general view), in fig. 2 vibrating screen sieve, in fig. With the working surface of the sieve, in fig. 4 profile element of the screen (section A - A in Fig. 2).

The vibrating screen (Fig. 1) contains a box 1 located on supporting elastic elements 2, a loading device C and unloading devices for the product above the grate 4 and below the grate 5. The box is equipped with a vibration exciter b (for example - a two-shaft inertial one) and is divided by a variable sieve 7 into two parts. The sieve can consist of one or more identical sections (the number is not limited). The working surface 8 of the sieve (sieve) is divided by longitudinal walls 9 (Fig. 2) and it has unloading windows 10 (Fig. 3), located at an angle to the longitudinal walls 9. In addition, the working surface can be made perforated with holes 11, corresponding to the required grain size of the material. Profile elements 12 are fixed above the unloading windows (Fig. 2). At the same time, one end 13 of the profile elements is rigidly connected in turn to the opposite longitudinal walls 9, and the other end 14 forms gaps with them for the passage of material. The profile element (Fig. 4) is made in the form of a box-shaped trough and contains a convex-concave perforated front wall 15, a solid rear wall 16 and end surfaces 17.

The vibrating screen works like this.

The material to be separated is fed to the working surface of the screen 7 through the loading device C (Fig. 1). Under the action of vibrations directed along the longitudinal axis of symmetry of the screen, which are created by the vibrator 6, the material begins to be transported along the working surface, forming a uniform filling of the chutes. The flow of material moves in a straight line to the moment of contact with the perforated front wall 15 (Fig. 4) of the profile element 12 (Fig. 2), which is located at an angle to the direction of movement of the material.

In the future, the movement of the material follows a helical trajectory - along the front wall 15, with simultaneous rotation due to its concave profile.

A distinctive feature of this movement is that it is obtained, with the longitudinally directed disturbing force of drive 6, due to the new design of the screen elements.

The material entering the perforated front wall of the profile element 12 moves up under the action of inertial forces. From the layer of material adjacent to the perforation through the holes

11 is separated into the lattice fraction. The remaining material reaches the break-off point, descends to the lower position, mixes with the main mass and the cycle repeats.

Such interaction of the material with the working surface of the sieve 8 ensures its intensive mixing, which significantly increases the efficiency of separation, and also increases the path of movement of the material along the sieving surface.

Having passed one profile element 12, the material enters the gap, where the rotational movement ends and the material moves forward along the wall of the box 9, receiving another mixing process.

Leaving the gap, the material falls on the next profile element 12, where the concave perforated front wall 15 is located opposite to the correspondingly adjacent profile elements, which ensures that the material is twisted in the other direction and increases the effect of its mixing and screening.

Having successively passed through all the profile elements 15, changing the direction of rotation in each of them, the under-sieve product is unloaded through the unloading device 5, and the over-sieve product through the unloading device 4.

The proposed location of the profile elements ensures the sinusoidal nature of the movement of the material along the working surface of the screen (the trajectory is shown in Fig. 2), which significantly increases the path of separation of the material at a constant length of the screen. At the same time, the total length of the separation consists of the length of the sinusoid and part of the helical line of movement of the material along the concave front wall of the profile element.

Thus, the proposed design of the vibrating screen allows you to evenly distribute the material along the width of the box along the entire transportation path, increase the transportation path, and ensure intensive mixing of the material during the transportation process.

The result of this is a significant increase in the efficiency of material screening.

Claims (1)

FORMULA OF THE INVENTION A vibrating screen containing a box with a working surface that transports, supporting elastic elements, a vibrating exciter, which is characterized by the fact that the working surface has zigzag-shaped unloading windows, above each of which profile elements made in the form of a trough are installed, while each of the adjacent profile elements is fixed on the opposite longitudinal walls of the box with the formation of a gap between the free end of the profile element and the nearest longitudinal wall and the possibility of sinusoidal transportation of the material. soshkoumi Brooch how I 7 ay sec sk What Fig. 1 p g. o. . OZ U OH OO s s Z More I Penn More: Fig. 2 di Ko : i Ki ssh ee, Fig. Z ek i: y she she is g! shen sh Fig. 4