SU1680371A1 - Screening device - Google Patents

Description

The invention relates to the separation of bulk materials by size and can be used in the mining, metallurgical and other industries. The purpose of the invention is to increase the performance and ease of maintenance of the device by adjusting the size of the screening holes without changing the area of the living section of the screening surface. To do this, each of the successively installed screens contains elastic elements (EE) 7 with double-sided protrusions 8 placed on the side surface of each EE 7. Projections 8 of each EE 7 m. B. shifted relative to each other by half a step or by the thickness of the protrusion. EE installed parallel to each other with the formation of sieve screening holes. Every second EE 7 is installed with the possibility of rotation around its axis through 180 ° and fixation. The source material is fed sequentially to one end of the vibrating sieves and advanced under the action of vibration and tilt to the other end. At the exit end of each sieve, an appropriate size class is formed. 2 h. item f-ly, 6 ill.

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The invention relates to devices for the separation of bulk materials by size and can be used for the classification by size of various raw materials in the mining, metallurgical, chemical industry, as well as the building materials industry,

The aim of the invention is to improve the performance and ease of maintenance of the device by adjusting the size of the sieve holes without changing the area of the living section of the sieve.

FIG. 1 and 2 are schematic diagrams of a screening device; in fig. 3 and 4 - two sieves of the device from elements with offset of bilateral projections on the thickness of the protrusion in fig. 5 and 6 - two sieves of elements with offset bilateral protrusions by half a step.

A device for screening bulk materials into three size classes (along two boundaries of screening) consists of successively installed sieves 1 and 2, mounted in two single-conductor vibration boxes 3 and 4 (Fig. 1a), or in one vibrating two-box duct 5 (Fig. 16 ). Each of the sieves 1 and 2 is made up of identical elements 7 installed in a frame 6 that are identical and equipped with periodic projections 8 on both sides, placed on the side surface of the element and offset relative to each other by the thickness of the protrusion (Fig. 3). Every second element 7 of the sieve 1 is installed with the possibility of rotation and fixation 180 °. The protrusions of each element 7 can be located against the protrusions of the neighboring with the formation of larger gage cells 9. The elements 7 of the sieve 2 are installed in the same position, the protrusions of each element are located against the intervals between the protrusions of the neighboring elements and form with them calibrating cells 10 smaller in size than the cells 9 of the sieve 1. The distance between the elements of the 7 sieve 2 'is smaller than the distance between the elements of 7 sieve 1. The setting of the distances between the screen elements is determined by the screening boundary.

Another example of the design of sieve devices is sieves 1 and 2, shown in FIG. 5 and 6. These sieves are also made up of identical elements 7, similarly located on sieves 1 and 2, to form larger and smaller cells. The difference from the example described is in the form of elements 7, the protrusions 8 located on both sides of which are displaced relative to each other by a half step between them.

The screening device operates ¹ , as follows.

The source material is fed to one end of the vibrating sieve 1 and is advanced under the action of vibration and tilt to its other end (Fig. 1). At the same time, particles smaller than the sieve cells pass through the cells and enter the sieve 2. Particles that do not pass through the sieve 1 are large class I removed from sieve 1. Similarly, screening takes place on sieve 2, at the end of which an intermediate class II, and a fine class III material is collected under screen 2.

Claims (3)

Claim 1. Device for screening, including parallel elements installed with each other to form screening holes, elastic elements with double-sided protrusions placed on the side surface of each element displaced relative to each other, characterized in that, in order to improve the performance and ease of maintenance of the device by adjusting the size of the screening holes without changing the cross-sectional area of the sieve, each second elastic element is installed with the possibility of rotation around its axis by 1 80 ° and fixation. 2. Device pop. 1, differing in that the protrusions of each elastic element are displaced relative to each other by the thickness of the protrusion. 3. The device according to claim 1, of which is that the protrusions of each elastic element are shifted relative to each other by half a step. 1680371 1680371 5 Π-ΐ p and π ο π ο π υ {TSHSTShtNNU gTTPTPGGT-Ggyi