SU1411060A1 - Arrangement for screening - Google Patents

Abstract

The invention relates to mining technology and m. B. used in coal mining, metallurgical, chemical, and others. The purpose of the invention is to improve the quality of screening by providing oscillations of elastic grates (K) with a limited amplitude and reliability of the device by increasing the carrying capacity of the sieve (C). In the supports of the fixed box 1 with loading and unloading nozzles at an angle to the horizon, set C as a set oriented along the longitudinal axis K 5 of elastic material and K 6 of more rigid material placed alternately across the width C. Working surface K 6 is located below the working surface K 5 is less than the height of K 5. Stops in the form of clamping strips are arranged on the working surface of K 6; they are located periodically along the length C perpendicular to the longitudinal axis C. The walls of the stops facing the loading end Are inclined to its working surface at an acute angle. Pieces of the undersize product (P) fed to the raw material material C pass between K 5 and 6 and are discharged into the discharge port. Pieces of the naked P hit about K 5 and make a jerky movement, moving toward the discharge end of C. Under the action of the blows of K 5, they oscillate in a vertical plane, facilitating the passage of the pieces into the undersize P. 2 z.p. f-ly. c (g (L

Description

O5

F1 / G.2

The invention relates to mining technology, in particular to devices for screening, and can be used in the coal, mining and metallurgical, chemical and other sectors of the national economy.

The purpose of the invention is to improve the quality of screening by providing oscillations of elastic grates with limited amplitude and reliability in the operation of the device by increasing the carrying capacity of the sieve.

FIG. I shows a device for grooving | longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 — device, embodiment, longitudinal section; in fig. 4 - section B - B in FIG. 3; in fig. 5 — device, embodiment, longitudinal section; in fig. 6 is a sectional view BB in FIG. five; in fig. 7 is a fragmentary top view of a screening device; in fig. 8 - section G-Y in FIG. 7 {scheme of action of forces applied to the lice in the gap of a particle of material).

The device consists of a fixed jpo6a with loading net pipe 2 and discharge pipes 3 and 4, respectively, for supersize and undersize products. In a box I with an inclination at an angle a to the horizon, a sieve is installed; it contains a set of grates 5 made of I elastic material oriented along the OX axis of the sieve, fixed with precalculation tension, and are connected with them at least one of the grates 6 of the more rigid. material. For example, elastic grate 5 can be made of rubber grade 2959 TU 38.105.1082-76, and grate 6 - made of steel 65 G GOST 1050-74. Moreover, the height h | E. Particle grate 5 exceeds the height ha of the grate 6, the working surface E of which is located below the working surface D of the elastic heading 5 on the ground; lesser heights hi, 1 e.;.:; hi.

The grate 6 of a more rigid material is made with stops 7, located periodically with a clamp t on the working surface E of the grate. The walls of the stop are inclined to the working surface E at different angles: the wall a to the loading end of the sieve wall a is inclined at an acute angle p, and the wall b facing the expansion T-end is directed by the angle.

The stop (l 7 can be made in the form of sieves distributed along the length with a step ti of pressure n. IaiiOK 8, arranged perpendicular to the longitudinal axis of the sieve and attached to the grates 5 and 6 by the pressure plate 9 and the bolt joint 10. Depending on conditions 1 rotations and end-product requirements, stops 7 can be fixed in increments of up to

five

0

chivayuyun imz from the loading end of a sieve to unloading. This makes it possible to provide a different frequency of oscillation of elastic grates along the length} of the sieve.

The device works as follows.

The source material (I.M.), containing pieces of the undersize product (PP) and large pieces 11 of the overstep product (NP), flows from loading nozzle 2 to the sieve and moves along it with speed V The pieces of the undersize product are transported over the surface E and pass through the gaps d between the grate bars, fall into the discharge port 4. The pieces of the pre-bottom product, while jumping on the sieve, hit the grate 5 and due to the large kinetic energy cause them to deflect, moving at a certain length on the plane E. Under the action of these strikes, the grate 5 oscillates in a vertical plane.

The hard particles 12 (Fig. 8) of the material, which cross the transverse component of the gravitational force P, are affected by an additional turning point of the friction force EI, which facilitates the passage of particles into the undersize product and improves the quality of screening. Due to the installation below the elastic grates 5 steel grates 6, the amplitude of oscillations of the grates 5 does not exceed the value of the grate displacement in the vertical plane, i.e., their deflection is limited and does not depend on the load (layer thickness or oversize pieces) of the rattling material, which allows to increase the specific load on the sieve. The fixed grate-limited devices with a fixed duct, limited by the vertical vibration amplitude 5, improve the conditions for the passage of particles through the slits of the sieve and, due to the presence of rigid grates 6, have a higher carrying capacity.

five

0

0

five

0

five

In addition, alternating with the width arrangement of the sieves of elastic and rigid grates limits the maximum gap size in the screen plane to 2d (Fig. 7) due to the fact that the horizontal deflection f of the elastic grate 5 does not exceed d, i.e. the maximum the size of the gap depends only on the horizontal deflection of one grate 5, in contrast to the known device, where the total deflection in the sieve plane of several adjacent grates leads to a larger value of the gap size, resulting in possible wedging between the edges snik.mi oversized large pieces, which significantly reduces the quality of screening.

When executing grates 6 (Fig. 3) with stops 7 pieces during transportation, meet with the front inclined wall

It is characterized by a PL, which, in order to improve the quality of screening due to the provision of, fluctuations | elastic grates with limited amplitude and reliability in the operation of the device by increasing the carrying capacity of the sieve, the working surface of the grates made of more rigid material is placed below the working surface of the elastic grates by an amount less than the height of the elastic grates,

a, they are accelerated on it and thrown to a greater height, which provides a greater impact force in the fall and more intense "shaking of the grate 5, which enhances the positive properties of the proposed design.

When the stops 7 (Fig. 5) are made in the form of clamping strips 8, it is possible to change the ujar placement of the stops along the sieve length and thereby control the number of encounters (oscillation frequency) and the grate bars from the more rigid material of the elongated pieces with the elastic grate bars. with stops on the working surface. This feature allows additionally arranged periodically to adjust the vibration parameters of the elastic-length of the sieve, with the stop walls facing the immersion grates installed in the subjunctive end of the sieve, depending on the conditions on the working surface of the sieve under the screen - screening, eye angle.

2. Ustrystvo under item 1, characterized in that the stops are made in the form of clamping plates placed perpendicularly

1. Device for screening, including the longitudinal axis of the sieve.

secondary inclined sieve, made in the form of 20 3. The device according to claims. 1 and 2, fixed along the longitudinal axis of the sieve, so that the stops are placed in the supports of the duct of elastic grates along the length of the sieve with a pitch that increases and the grates of a more rigid material, from the loading horse to the sieve placed alternately across the width of the sieve , unloading.

Invention Formula

 D 7.

It is characterized by a PL, which, in order to improve the quality of screening due to the provision of, fluctuations | elastic grates with limited amplitude and reliability in the operation of the device by increasing the carrying capacity of the sieve, the working surface of the grates made of more rigid material is placed below the working surface of the elastic grates by an amount less than the height of the elastic grates,

grates of more rigid material are made with stops on the working surface, arranged periodically along the length of the sieve, and the wall of the stops facing the loading end of the sieve is inclined to the working surface of the sieve at an acute angle.

1

5-6

FIG.

but

3

(71

/ / / / / /

X

/ / / / /

FIG. five

in-in

FIG. 6

paxig .7

Claims (3)

Claim 1. The device for screening, including an inclined screen, made in the form of 20 fixed along the longitudinal axis of the sieve in the supports of the duct elastic grates and grates of more rigid material, placed alternately across the width of the sieve, characterized in that, in order to improve the quality of screening due to the provision oscillations of elastic grates with limited amplitude and reliability in the operation of the device by increasing the load-bearing capacity of the sieve, the working surface of the grates of more rigid material is placed below the working surface the number of elastic grid-irons by an amount / less than the height of the elastic grid-irons, while the grid-irons of more rigid material are made with stops on the working surface located periodically along the length of the sieve, and the wall of the stops facing the loading end of the sieve is inclined to the working surface of the sieve at an acute angle. 2. The device according to π. 1, characterized in that the stops are made in the form of clamping strips placed perpendicular to the longitudinal axis of the sieve. 3. The device according to paragraphs. 1 and 2, characterized in that the stops are placed along the length of the sieve in increments increasing from the loading end of the sieve to the unloading. 5-5 FIG. A FIG. B yr