SU1077656A1 - Screen - Google Patents

Abstract

The roar, including the case, the screening surface in the form of parallel-mounted rolls formed by the strings, the loading and unloading devices, characterized in that, in order to increase the efficiency of the screening process by self-cleaning of the strings, the screen is fingerprinted with the external screen rolls in the direction of rotation of the latter, and the working surface of each Pszc is removed from the center of the roll for a distance less than ICS roll.

Description

The invention relates to a technique for the separation of bulk materials by size, namely, screening, and can be used in the coal, mining, chemical industries, as well as in the construction materials industry to isolate in dry form small fractions from difficult-to-wet moist materials.

Roller screens are known, the screening surface of which is formed by rolls arranged transversely with respect to the movement of the material, parallel to each other, with a certain gap 1.

The disadvantage of such screens is a small living, section of the working surface.

The closest to the invention in terms of technical efficiency and the effect achieved is a screen comprising a body, a screening surface in the form of installed parallel rotating rolls formed by strings, loading and unloading devices L 2.

The disadvantage of this screen is the low efficiency of the screening process.

The aim of the invention is to increase the efficiency of the screening process by self-cleaning the screening surface as a result of periodic vibration of the strings.

This goal is achieved by the fact that the crash, the enclosures, the projection surface in the form of installed parallel rotating altars formed by the strings, the loading and unloading devices are provided with fingers mounted on the outer side of the rolls in the direction of rotation of the latter, and the working surface of each finger is removed from roll center at a distance smaller than the roll radius.

Figure 1 shows the roar, a longitudinal section (without the near side of the case); figure 2 - view And figure 1.

The screen contains a frame 1 in which a fixed case 2 with a loading device (chute) is fixed. 3. The sowing surface of the ipoxoTa is formed by cylindrical rollers 4 installed across the flow of crushing material one next to the other with a gap and fixed to frame 1 by means of bearings 5.

Each roll 4 consists of a shaft 6, on the ends of which the disks 7 are mounted. The edges of the disks 7 are interconnected by strings 8 of an elastic deformable material, for example of rubber. The strings 8 are fastened next to each other with a gap, the value of which is determined by the required boundary grain size. Under each of the rolls 4 on the case, the fingers 9 are mounted; The crissons of which are in engagement with the strings 8, and the wiper fingers 9 are inclined in the direction of rotation of the rolls 4. The inclination of the wiper fingers ensures a smooth entry of the rotor strings into engagement.

In the roll 4 (Fig. 2), one of the strings in is in engagement with a stationary elastic finger with a cleaner, the string 8 is deformed, with the result that one of the lower slots is enlarged.

The operation of the screen is as follows.

The source material from chute 3 enters the upper surface of the rolls 4 and under the action of gravity and rotation of the rolls 4 moves along the screened surface to the discharge device (chute) of the shear product.

When the rattling material is moved, it is intensively loosened, while small classes through the gaps between the strings 8 fall inside the rolls 4 and further into the discharge device (groove) of the undersize product. Pieces of material that are close to the separation marginal size that have passed through the gaps inside the roll 4 and stayed in it, after a certain number of attempts, pass through the enlarged slot S near the deformed string 8 and fall into the unloading accessory (counter) of the undersize product. Pieces of material that are close to the large-scale separation boundary that has passed through the slots inside roll 4 and are retained there after a certain number of attempts pass through the enlarged slot S near the deformed string and fall into the discharge device (chute) of the undersize product. The cleaning of the strings and the slits by means of them occurs as a result of the vibration that the string undergoes when it leaves the mesh with the finger-cleaner.

Thus, supplying the screen with the fingers mounted from the outer side of the rolls in the direction of rotation of the latter, and also because the working surface of each finger is less than the roll radius from the center of the roll, makes the screening process more efficient.

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FIG. 2

Claims (1)

SCREEN, comprising a housing / ”screening surface in the form of parallel rotating rolls formed by strings, loading and unloading devices, characterized in that, in order to increase the efficiency of the screening process by self-cleaning the screening surface as a result of periodic vibration of the strings, the screen is equipped with fingers installed with the outer side of the rolls in the direction of rotation of the latter, and the working surface of each finger is removed from the center of the roll by a distance less than the radius lka.