SU1748886A1 - Sieve - Google Patents

Abstract

The invention relates to mining equipment; particular to screening screens, and can be used for separating various materials. It makes it possible to improve the quality of the 1 S I H separation products and the durability of the sieve by ensuring uniform wear of the tapes (L) along the length. This one is made in the form of elastic L 1 with protrusions (B) 2 on the lateral surface, which are clamped with tension in the supports 3. The additional B 6 in the form of elastic rods 4 are placed on the working surface L 1 between the main В 2 at least least in areas adjacent to the supports 3. The height of the additional 6 is less than the longitudinal size of the screening cell formed by two adjacent L. and their transverse size does not exceed the transverse size of the cell. Cross-section B 6 and the thickness of the elastic bands may increase as they approach the supports. 2 з.п f-ly, 10 ill. with C 2 00 00 00

Description

The invention relates to mining technology, in particular to screening screens, and can be used to size various materials.

The aim of the invention is to improve the quality of the separation products and the durability of the sieve by ensuring uniform tape wear along the length.

Fig, 1 shows a fragment of a sieve, top view; in fig. 2 is a view A of FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 is a sieve, an example of execution; in fig. 5 shows a section B-B in FIG. one; in fig. 6 — sieve, embodiment; fig 7 is the same; in fig. 8 and 9 are diagrams for the distribution of flows of rushing material; in fig. 10 shows a section of YYY in FIG. eight.

The sieve contains a set of elastic bands 1 with periodically located on the side surface and main protrusions 2. The belts are fixed with tension in rigid supports 3 by means of stops 4. When mounted in supports, several bands 1 are arranged with a step t along the length I of the projections 2 adjoin with a gap d to the smooth side surface b of the adjacent tape and form through screening cells (slits) 5, while the walls of the cells belong to the adjacent tapes. Unlike the prototype, the tapes 1 are provided with additional projections b made in the form of elastic rods, for example, of round shape with a d-head placed on the working surface of the AI tapes between the main projections 2. The transverse dimension d of the protrusion is smaller than the transverse size D of the cell 5, and the height h is not more than the longitudinal dimension dip, i.e. d D; h dtp. These ratios ensure free fall of particles of small fractions into cells B. From the condition of increasing the amplitude AO of the oscillations of the projections 6 relative to the belt 1, the cross-sectional area of the protrusion Fe is smaller than the cross-sectional area of the FI tape and F2 of the main protrusion, i.e. Fe Fi and Fe Fa.

The protrusions 6 can be located along the entire length of I l & or only on the areas adjacent to the end 3 and intermediate support 7 (Fig. 4, 5),

In order to ensure uniform wear of the belt 1 of length I, additional protrusions 6-6 (FIG. 2) can be made in cross section with a dimension d increasing from the middle of the belt span to supports 3 and 7. i.e.

di d2 ds.

In the proposed sieve elastic tape 1 (Fig. 6) and G (Fig, 7) can be performed

with a thickness S, gradually increasing towards the supports 3 and 7, which additionally reduces the abrasive wear of the slow-moving sections of the tape 1 at the supports.

Supports 3 and 7 are attached to the coupling beams of a vibrating screen box or similar device (not shown).

The sieve works as follows.

During oscillations of the screen, the supports 3 and 7 rigidly attached to its box move with the amplitude Ak, and the tapes 1 of elastic material oscillate with the amplitude Az relative to the supports 3 and

7, moreover, the oscillation mode of the ribbons 1 has the form of a sinusoid a with a maximum deflection of Amaks in the middle between the supports. The screened material transported along the working surface AI of the sieve is divided into

classes in cells 5 and due to their highly abrasive properties wear tape 1 by the value of D, the distribution of which along the length I of the tape is due to the different area: sparing tracks Ft and FII.

By making tapes with additional protrusions 6 placed on the working surface AI in the interval between the main protrusions, firstly, the weakened intervals between

protrusions 2, which are most susceptible to abrasive wear, and, secondly, there is a redistribution of flows of rattling material between the tracks (longitudinal. bands) I and II (Fig. 8 and 9),

The protrusions 6, which are located directly on the working surface, function as dividers (or distributors) of the flow, directing a part of the transported material from tracks I, having a minimum area FI of the working surface, to track II. It is the redistribution of flows that reduces the abrasive wear of the D sections of the belts 1 between the protrusions and leads to uniform wear of the belt along

length I. This contributes to a longer life of the tape with a constant length and, accordingly, stabilizes the dimensions of all the cells 5 along the length I, which ensures an increase in the quality of the separation products.

In addition, when the particles of the transported material collide with the protrusions 6, their flexural vibrations AC are amplified, which are primarily caused by the vibrations of the ribbons themselves and the area ratio Fi,

F2 and Fe. This contributes to the intensive vibro-processing of 6 layers of material flowing around the protrusions, which further reduces the local wear of the belts, since the material is in a vibro-weighted state and the coefficient of friction significantly decreases.

Claims (2)

3, due to a change in the amplitude Az over the screen width, an increase in the size d of the protrusions (Fig 2) and the thickness of the tapes S (Figs 6 and 7) to the supports further aligns the wear of the tapes along the length due to the reinforcement of low subframe (Amin) sections of the tapes on the supports. Claim 1. Sieve, including elastic tapes with protrusions on the side surface, fixed with tension in supports, characterized in that, in order to improve the quality of separation products and the durability of the sieve by ensuring uniform wear of the tapes along the length, they are provided with additional protrusions. 0 five elastic rods placed on the working surface between the main projections at least in the areas adjacent to the supports, the height of the additional protrusions is less than the longitudinal size of the screening cell formed by two adjacent ribbons, and their transverse size does not exceed the transverse size of the cell. 2. A sieve of pop, 1, characterized in that the additional protrusions in cross section are made with a size increasing to the supports. 3, Pop sieve 1, characterized in that the elastic bands are made with a thickness that gradually increases towards the supports. Viva s .nAJ5 Wosh R I u H & SH5 1/70 / I hash§ 1748886 FIG JO