RU2568460C1 - String screen - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to screening and classification of loose materials, mainly, rock heaps. Claimed device comprises feed hopper and sieving surfaces arranged one above the other in tiers. Every tier is coupled with intake hopper. Note here that said feed hopper and every sieving tier can displace in side guides of the screen front wall located at the preset angle to horizontal line. Every sieving tier of the screen bottom part can displace over lateral edges of horizontal guides articulated to interact with intake hoppers. Said side walls of intake hoppers are composed by two halves overlapped and provided with the insert of resilient material. Side edges of every sieving tier, apart from the lower one, are provided with angle-pieces to displace there over. Transverse strings are secured at said angle-pieces and located above the lengthwise strings. Transverse strings accommodate agitators to run them unobstructed. The uppermost sieving surface features the maximum width between the strings. Every other sieving surface features the width between the strings. Screen front wall location angle exceeds the classified material natural slope angle.

EFFECT: higher efficiency of classification.

3 cl, 5 dwg

Description

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

A known screen containing a grate and installed in the guides with the ability to move the comb with teeth located at an angle to the plane of the grate to clean the slots between the grates, the grate is installed obliquely to the horizontal plane, and the comb is suspended from the sheave, the movable block of which is connected to the rod hydraulic cylinder [A.S. USSR No. 325045 IPC V07V 1/12, 1972].

A disadvantage of the known device is that, solving the problem of separating large stones from a quarry mixture, it does not divide the sifted rock mass into other classes by size. In addition, with such a design, it is difficult to organize additional screening grate and receiving hoppers, which also increase the size of the screen.

Closest to the proposed invention is a sieve (screen) containing a screening surface in the form of longitudinal rods obliquely mounted 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 located through one of the rods of the lower tiers is made bent in a vertical plane, and the receivers of the separation products are made in the form of vertically installed one after another divides leu, the upper ends of which, except the first and last are fixed the bottom edges of the lower tiers of the rods, wherein the fold line of each tier is placed over rods divider forming the receiver oversize product of this separation stage [A. USSR No. 1699654 IPC V07V 1/12, 1991].

The disadvantage of this design is also expressed in the fact that for effective sorting it is necessary to keep the screened material for some time on the working surfaces of the sieve. This leads to the need to increase the size of the receiving hopper for the smallest class, which leads to an increase in the overall dimensions of the screen.

The present invention solves the problem of effectively dividing rock of different composition into classes by size with a minimum of weight and size parameters of the device.

This is achieved by the fact that the string screen contains a hopper feeder, sieving surfaces mounted on top of each other in many tiers, each tier of which is interfaced with receiving hoppers, while the hopper feeder and each sifting tier are arranged to move along the side guides of the front wall of the screen installed at an angle β to the horizontal, and in the lower part of the screen, each screening tier is made with the possibility of moving along the lateral edges of horizontal guides articulating with the receiving bunkers, and the side walls of the receiving bunkers themselves are made of two movable halves overlapped with an insert of elastic material, and the side edges of each sifting tier, except for the lower one, are equipped with corners with the ability to move along them, and transverse strings located under the corners are fixed longitudinal strings, and on the transverse strings themselves freely rotating agitators are installed, while the uppermost screening surface has the greatest width between the strings, on each screening surface guide width between the strings is reduced and the setting angle β of the front wall screen exceeds the angle of repose of the material being sorted. The upper part of the front wall of the screen to the screening surfaces serves as the wall of the hopper. The agitators are equipped with blades located at a distance l above the longitudinal strings, and the length of the blades, their number and value l depends on the properties of the sorted mass.

The installation of screening surfaces with the ability to move on an inclined front wall with the possibility of adjusting the angle of their inclination allows more efficient separation of the rock mass by size and reduce the overall dimensions of the screen.

The problem in which the front inclined wall is the wall of the hopper-feeder also serves to reduce the overall dimensions of the screen.

For effective separation of the rock mass, it is proposed to use agitators in the device, which allow turning over and turning the rock mass on sieving tiers.

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

The invention is illustrated by drawings.

In FIG. 1 shows a string screen, side view; in FIG. 2 is a view A of FIG. 1 to the screening surface; in FIG. 3 - an element for moving and fixing the upper and lower parts of the frames of the screening surfaces, the hopper of the feeder and the corners with transverse strings along the side edges of the frame of the screening surfaces; Fig. 4 is a view B of a receiving hopper; in FIG. 5 - agitator.

The string screen contains screening surfaces in the form of longitudinal strings 2 inclined on the frame 1. Screening surfaces are installed so that the uppermost has the largest width between the strings, and on each subsequent screening surface the width between the strings decreases. The angle α of the string installation exceeds the angle of repose of the sorted material. The front wall 3, installed at an angle β, also exceeding the angle of repose of the sorted material with guides located along the side faces 4. In the upper part of the front wall there is a hopper-feeder 5 with a slide gate 6, one of the walls of which is a continuation of the front wall 3. Hopper - the feeder is mounted with the possibility of moving and fixing 7 on the side guides 4 of the front wall. In the lower part of the frame of the screening surfaces are equipped with receiving hoppers 8 mounted on the hinge 9 and interact with the possibility of moving and fixing along the lateral edges of the horizontal guides 10. The side walls of the receiving hoppers 8 are made of two movable halves 11 and 12, overlapped, with an insert 13 of elastic material, such as rubber. The lateral edges 14 of the frame of each screening surface, except the lowest one, are equipped with the ability to move along them with angles 15 with transverse strings 16 stretched over them under the longitudinal strings 2, on which freely rotating agitators 17 are mounted, the blades 18 of which protrude a distance l above the longitudinal strings sifting tiers. Tedders are located between the longitudinal strings 2 (Fig. 2).

The string screen for sorting the rock mass works as follows.

Depending on the properties of the sorted rock mass, we set the hopper-feeder 5 to a certain height, shifting it along the side guides 4 of the front wall 3, having an angle β greater than the angle of repose of the sorted material, and fix it with a latch 7 (Fig. 3). In the same way, depending on the properties of the sorted rock mass, we set the angle α of the screening surfaces consisting of a frame 1 (Fig. 2) and longitudinally stretched strings 2. At the same time, the upper part of the frame 1 moves along the guides 4 of the front wall 3 and is fixed with a lock 7 like the hopper-feeder, and the lower part of the frame 1 with a receiving hopper 8 mounted on it by a hinge 9 moves along the lateral edges of the horizontal guides 10 and is fixed by a latch. The locking element is similar to that shown in FIG. 3. With an increase in the installation angle α, the screening surfaces will be shifted to the front wall 3, while the horizontal position of the receiving hoppers 8 will be ensured by a hinge 9. Moving the lower part of the frame of the screening surfaces will expand or narrow the receiving hoppers, except for the hopper for the largest material . This is achieved by moving the two movable halves 11 and 12, installed overlap, with the insert 13 of an elastic material, such as rubber, ensuring the tightness of the joint.

Open the slide gate 6 of the hopper-feeder 5. The rock mass under the action of gravity falls on the front wall 3 and the upper screening surface. Large pieces of rock linger on the screening surface. The agitators 17 rotate freely on the transverse strings 16, fixed, in turn, at the corners 15 of the lateral edge 14. The agitator blades 18, interacting with the sorted material, cause the agitator to rotate, while the oncoming blade helps to turn over the pieces of the sorted material. At the same time, large pieces of rock mass turn over, shaking off a small fraction of the rock mass. Large pieces after passing along the screening surface fall into the receiving hopper 8. In the same way, the screening process takes place on other underlying screening surfaces, which delay their size class, sending it to the corresponding receiving hopper.

The string screen is covered by a casing (not shown in the drawing), which prevents dusting when sorting the rock mass.

The use of the proposed string sieve allows us to solve the problem of efficiently dividing rock mass of various composition into size classes, and also to quickly reconfigure it to another particle size distribution, with a minimum of mass and size parameters of the device.

Claims (3)

1. String screen containing a hopper feeder, sifting surfaces mounted on top of each other in many tiers, each tier of which is paired with receiving hoppers, characterized in that the hopper feeder and each sifting tier are arranged to move along the side guides of the front wall of the screen installed at an angle β to the horizontal, and in the lower part of the screen, each screening tier is made with the possibility of moving along the lateral edges of horizontal guides articulating with the receiving hopper si, and the side walls of the receiving bunkers themselves are made of two movable halves mounted with an insert of elastic material, and the side edges of each sifting tier, except for the lower one, are equipped with corners with the ability to move along them, and transverse strings located under the corners are fixed longitudinal strings, and on the transverse strings themselves mounted agitators with the possibility of free rotation, while the uppermost screening surface has the largest width between the strings, on each of the subsequent screening surface, the width between the strings decreases, and the angle of installation of the front wall of the screen β exceeds the angle of repose of the sorted material. 2. The string screen according to claim 1, characterized in that the upper part of the front wall of the screen to the screening surfaces serves as the wall of the hopper. 3. The string screen according to claim 1, characterized in that the agitators are equipped with blades located at a distance l above the longitudinal strings, the length of the blades, their number and value l depending on the properties of the sorted mass.

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