RU2541351C1 - Grading device - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: grading device comprises grading sections located one under another, which consist of parallel infinite closed traction and bearing elements, driving and driven pulleys with guiding chutes designed with decreasing of distance between the traction and bearing elements from the upper grading section to the lower one, receiving bins and conveyor for undersize under the lower grading section. All grading sections are designed with the different areas both by length, and by width in decreasing order, from above downwards and are levelled along the vertical line under the feeding bin. The grading sections are installed on supports expanding upwards by grading width. The longitudinal projection of supports under the feeding bin, is designed vertical, and the longitudinal projection of supports near receiving bins is tilted towards them. Grading sections are installed on supports with a possibility of adjustment of distance between them, feeding bin and conveyor for small pieces.

EFFECT: improving the efficiency of grading.

3 cl, 2 dwg

Description

The invention relates to techniques for screening and separating bulk materials by size, mainly coal.

A sieve is known, including a screening surface in the form of longitudinal rods inclined on the frame, a hopper-feeder and receivers of separation products, the screening surface being multi-tiered, while the rods of the upper tier are fixed cantilever, and the lower ends of the lower tiers located through one rod are made bent in a vertical planes, and the receivers of the separation products are made in the form of vertically mounted one after another dividers, to the upper ends of which, except the first and last second, fixed lower edges of lower layers of rods, wherein the fold line of each tier is placed over rods divider forming oversize product separation receiver of this stage [A. USSR No. 1699654 IPC B07B 1/12, 1991].

A disadvantage of the known device is that all screening surfaces of multi-tier sorting are made with the same dimensions in width, increasing the volume and weight of the product.

Closest to the proposed invention is a sorting installation, including sieving sections arranged one below the other, consisting of parallel endless closed traction-bearing elements and drive and driven pulleys with guide grooves, made with a decrease in the distance between the traction-bearing elements from the upper screening section to the lower , receiving devices and a conveyor for spilling under the lower screening section, each screening section is made separately with endless substitutes with curved traction-bearing elements and is located with a shift towards the receiving device, while the distance between all the guide chutes is equal to the minimum normalized size of the final product, and the distance between the traction-bearing elements in each screening section is a multiple of the distance between the guide chutes [RF Patent No. 2043170 IPC B07B 1/10, 1995].

The disadvantage of this design is also expressed in the fact that the areas of all screening sections are equal and are installed with a shift towards the corresponding receiving device. Such a design is also characterized by large dimensions and, accordingly, sorting mass.

The present invention solves the problem of reducing the geometric volume and reducing the sorting mass by reducing the area of each lower screening section.

This is achieved by the fact that the device for sorting, including sieving sections located one below the other, consisting of parallel endless closed traction-bearing elements, drive and driven pulleys with guide grooves, is made with a decrease in the distance between the traction-bearing elements from the upper screening section to the lower , receiving hoppers and conveyor for the under-sieve material under the lower screening section, while all screening sections are made with different areas both in length and in width in pore decrease, from top to bottom and vertically aligned below the hopper-feeder, and the screening sections themselves are mounted on supports that extend to the top of the sorting width, and the longitudinal projection of the supports located under the feeder-hopper is vertical, and the longitudinal projection of the supports at the receiving hoppers is tilted in their direction.

The screening sections are mounted on supports with the possibility of adjusting the distance between themselves, the feed hopper and the conveyor for small items.

The ends between the screening sections on the side of the hopper of the feeder are closed by a vertically mounted casing, and the longitudinal ones are inclined toward the screening sections with an angle exceeding the angle of repose of the sorted product.

The implementation of screening sections with different work surfaces and setting them in the order when the largest screening section is designed for the selection of the largest pieces of product is the largest in length and width, and below it other, smaller in length and width sections in decreasing order, reduces the geometric volume and weight reduction sorting.

Thus, there is a causal relationship between the hallmarks and the task at hand.

The invention is illustrated by drawings.

Figure 1 shows a side view of a sorting with a moving rope field; figure 2 is a section aa of figure 1.

Sorting with a rope moving field contains a hopper-feeder 1, screening sections 2. Screening sections consist of leading 3 and driven 4 drums with guide grooves (not shown in the drawing), on which traction-bearing elements (ropes) 5 are wound, forming working surfaces . The screening sections are mounted under each other so that the beginning of the working surface of each screening section is aligned vertically 6 under the hopper-feeder 1. All screening sections are made with different work surfaces, i.e. have different lengths l and widths b and are installed in the order when the largest screening section with length l ₁ and width b _{1 is} used to select the largest pieces of the product, and others that are smaller and smaller in length and width in descending order are selected for the selection of the largest pieces of the product. The screening sections are mounted on supports 7 expanding upward in the sorting width (FIG. 2), and the longitudinal projection of the supports (FIG. 1) located under the feeder hopper is made vertical, and the longitudinal projection of the supports at the receiving hoppers is tilted towards them. The screening sections are mounted on supports with the possibility of adjusting the height h between themselves by a shoe 8. The end of the working surfaces of each screening section interacts with the receiving hopper 9 of the corresponding particle size distribution. In the lower part of the sorting, a conveyor 10 for the under-sieve material is mounted. The end space between the screening sections on the side of the hopper of the feeder is closed by a vertically mounted casing 11, and the longitudinal ones are inclined 12, towards the screening sections with an angle α exceeding the angle of repose of the sorted product.

Sorting with a rope moving field works as follows.

In accordance with the properties and granulometric composition of the sorted rock mass, sieving sections 2 are installed using shoes 8 on the slanting supports 7. For a more complete use of the working areas of the sieving sections, they are oriented and set under each other so that the beginning of the working surface of each sieving section is aligned on the vertical plane 6 under the feed hopper. Moreover, the height h ₁ from the lower edge of the hopper-feeder 1 to the working surface of the upper largest area of the screening section should not be less than the height of the maximum piece of sorted rock mass. The heights h ₂ and h ₃ are set based on the distance between the ropes 5 of the overlying section. The height h ₄ is set based on the volume of fines in the sorted material and the speed of the conveyor 10.

To sort the rock mass, a drive is rotated, leading the drum 3, which rotates the driven drum 4 by means of traction-bearing elements (ropes) 4. The sorted rock from the hopper-feeder 1 passes through the screening sections 2, on which the specified particle size remains discharged at the end of the working surface into the corresponding receiving hopper 9. Or you can write:

M = m ₁ -m ₂ -m ₃ -m ₄ ,

where M is the rock mass coming from the hopper-feeder, t; m ₁ - rock mass of large particle size distribution, remaining on the upper screening section and discharged into the corresponding receiving hopper; m ₂ - rock mass of average particle size distribution, remaining on the middle screening section and discharged into the corresponding receiving hopper; m ₃ - rock mass of fine particle size remaining on the lower screening section and discharged into the corresponding receiving hopper; m ₄ - sublattice material falling on the conveyor 10.

It follows from the formula that less rock mass falls on each subsequent screening section and it is therefore justifiable to reduce their area both in length l and width b. To avoid spillage and dusting of the sorting during operation, as well as the direction of the sorted material to the lower, smaller screening sections, the space between the screening sections on the side of the feeder hopper is closed by a vertically mounted casing 11, and the longitudinal ones are inclined 12, towards the screening sections with an angle α exceeding the angle of repose of the sorted product.

The use of sorting with a rope moving field equipped with screening sections made with different work surfaces, i.e. having different lengths l and widths b, and setting in such a way that the largest screening section length l ₁ and width b _{1 is} intended to select the largest pieces of the product, and others below it, smaller in length and width sections in descending order, will allow reduce the geometric volume and mass of the product. This in turn will allow them to be installed on a mobile chassis, as well as, for example, on continuous excavators (rotary, milling).

Claims (3)

1. A device for sorting, including sieving sections located one below the other, consisting of parallel endless closed traction-bearing elements, drive and driven pulleys with guide grooves, made with a decrease in the distance between the traction-bearing elements from the upper screening section to the lower, receiving hoppers and a conveyor for the under-sieve material under the lower screening section, characterized in that all screening sections are made with different areas both in length and in width in descending order it is from top to bottom and vertically aligned below the hopper-feeder, and the screening sections themselves are mounted on supports that extend to the top, and the longitudinal projection of the supports located under the hopper-feeder is vertical, and the longitudinal projection of the supports at the receiving hoppers is inclined in their side. 2. The device according to claim 1, characterized in that the screening sections are arranged to adjust the distance between each other, the feed hopper and the conveyor for the little things. 3. The device according to claim 1, characterized in that the ends between the screening sections on the side of the hopper of the feeder are closed by a vertical casing, and the longitudinal ones are inclined towards the screening sections with an angle exceeding the angle of repose of the sorted product.

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