SU1699657A1 - Vibratory sieve - Google Patents

Abstract

Mob's invention has been used for sifting loose materials in various sectors of the industry and improves the efficiency of sifting material. The vibrating screen consists of a base 10, a screening surface, for example, in the form of a grid (C) 5E attached to the case (K) 1, to which the exciter is attached. 12, mounted with the possibility of oscillation at an angle to the plate 6; Installed to K 1 on the base by means of shock absorbers 11. Under C 5 to K 1, a support plate (P) 6 is attached, on which an infinite flexible web is mounted about 7 whist PAMI-1 8, envelope plate 6, and the deflection elements 9. The web 7 may be performed with continuous or otver- STI E, its protrusions mb placed either with the possibility of contact with C 5 or with a gap. Over the lower branch of the blade 7 m0b. An optional plate is mounted. On both ends of the plates 6 and an additional m. free-rotating rollers, or plate ends m, b. made smoothly curved 9, zp fg-ly, 11 ill. Material S tsszsa Steppes

Description

The invention relates to devices for sifting bulk materials and can be used in various industries,

The purpose of the present invention is to reduce the energy intensity of the vibrating screen „

Fig „1 shows vibrating screen, general view; Figs 2-11 are variations of the various versions of the vibrating screen.

The vibrating screen (fig „1) consists of body 1 with discharge 2 and 3 and loading 4 holes. A screening surface is fixed inside the body, for example, in the form of a grid 5, under which the support plate 6 is fixed to the body 1.

Between the screening surface — the grid 5 and the plate 6 — there is an infinite flexible canvas 7 with a recess 8, enveloping the support plate 6, and pivoting elements 9 placed at opposite ends of the plate 6, which can be made in the form of smoothly bent opposite ends of the plate 6.

An endless canvas 7, which can be made solid, is mounted with the possibility of translational movement and interaction with the grid 5 by means of the projections 8. The housing is mounted on the base or the frame 10 by means of elastic supports 11. The vibrator 12 is fixed on the housing 1 and is installed with the possibility of direction oscillations at an acute angle to the plate 6. The protrusions 8 of the blade 7 can be located with a gap relative to the grid 5

The peculiarity of the vibrating screen (Figs. 2 and 3) is that in a flexible endless body 7 with protrusions 8- there are holes 13S and in plate 6 there are holes 14 through which the screened material falls into the cavity of the body 1 "Projections 8 of flexible endless The organ 7 can be in contact with the net 5, which forms the slacks 15, c. which material 16 accumulates (Fig. 4). The bypass elements are made in the form of freely rotating rollers 17 (Fig. 5). Such a vibrating screen device helps to reduce the resistance to movement of a flexible infinite body 7, i.e. increase the speed of its movement, which provides an increase in the frequency of the impact of protrusions on certain parts of the grid and corresponding

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about

five

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improvement of the quality of the cleaning of the grid cell.

Above the lower branch of the continuous, infinite flexible web 7, an additional plate 18 is installed completely curved so that they are adjacent to each other (Fig. 06). The angle between the horizontal and any of the branches of the additional plate 18 is smaller than the angle between the horizontal and the direction of vibration. The additional plate 18 is fastened with the plate 6 and with the housing 1 by means of screw jacks 19. Due to the intersection of the lower branch of the endless flexible web 7 and the movable plate 18, it is possible to reduce the loss of speed of the endless flexible body by using the transporting effect of the bottom surface of the plate 18.

A characteristic feature of the vibrating screen (Figs. 7 and 8) is that a plate 18 with holes 20 is installed above the bottom branch of an endless flexible body 7 with holes 13 so that they adjoin each other. The angle between the horizontal and any of the branches of the plate 18 is smaller than the angle between the horizontal and the direction of vibration. The plate 18 is attached to the device 21 for moving it, for example, of a rack type. Due to the mutual adherence of the lower branch of the endless flexible body 7 and the movable plate 18, it is possible to reduce the loss of speed of the endless flexible body by using the transporting effect of the bottom surface of the plate 18. At both ends of the continuous curved plate 18, free-rotating rollers 22 are mounted. The curved plate 18 is adjacent to the lower branch of an infinite flexible body 7, while the angle between the horizontal and any of the branches of the plate 17 is less than the angle between the horizontal and the direction iem vibration plate 18 is fastened to the housing by means of hydraulic (pneumatic) additional jack 23. The curved plate 18 is provided with apertures 20 (Figures 10 and 11)

Vibrating screen works as follows.

When the shafts rotate, the vibration exciter is of directional action 9

Su 1 communicates directional vibrations, contributing to the movement of material along the grid 5 from the loading opening 4 to the discharge opening 3. At the same time, the fine fraction of the material falls through the holes of the grid onto the flexible endless web for 7 seconds; the protrusions 8, which also move along the plate 6 due to the vibration effect on it. The material that has passed through the mesh 5 is transferred by the flexible endless web 7 to the side of the discharge opening 2 and is showered with it when the flexible endless body comes off the plate.

At the same time, under the influence of the vibration of the apex of the protrusions 8, they interact with the grid 5, shaking it while ejecting particles of material stuck in them from the cells. At the same time, due to the high vibration frequency of the vibrating screen body (15-50 Hz), the relatively small area of the grid 5 without gaps is exposed to a relatively small amplitude (1-10 mm) comparable to the thickness, L of the protrusion 8. The presence of a gap between the grid 5 and the protrusions 8. Allows you to affect the grid only by jerks, which is especially important when working with material containing elongated particles that can get stuck in the grid cells. They are knocked out of the cells from below by strikes of the protrusions, thereby increasing the efficiency of sieving material.

If the flexible endless web 7 is made solid, the material that has passed through the mesh remains on the flexible endless organ and, acting on it with its weight, increases its kinetic energy, which contributes to an increase in the speed of the flexible organ and more effective cleaning of the mesh by increasing the frequencies of the action of the protrusions 8 on separate parts of the grid. When making the web 7 and the plate 6 with the holes 14, the area of the flexible organ on which the material could adhere from its outer side decreases. The material adhering to the web from the inside (when requested through holes 13 and 14) is cut off when the 6 edges of the holes 14 pass through the plate. Such a sieve is preferably used when sieving material prone to sticking. In sagging 15 grids

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15

20

25

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thirty

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five

Rollers of material 16 are cast. under the influence of the moving Bc-bluffs 8 and, accordingly, the displacement of the slack 15 moves in the direction of unloading.

In this case, the roller 16 has a somewhat greater height on the side of the advancing protrusion 8 and a smaller one on the opposite side, where the protrusion retreats. Therefore, there is a constant pouring of material in the roller on the grid, as a result of which particles in contact with the grid rise to the upper layers, and other particles are fed to the grid. Such an exchange of particles on the surface of the grid promotes a better exchange of material and 1 faster removal of large particles to the upper layers, providing higher screening efficiency.

In the event of a gap between the plate and an endless flexible body, screw jacks 19 move the auxiliary plate 18 in a vertical direction until it touches the endless flexible body 7, and when a gap occurs between the plate 6 and the endless flexible blade 7, the rack and pinion mechanism 21 or jack 22 the plate 18 is moved in the vertical direction until it touches the endless flexible web 7,

Claims (10)

Invention Formula 1 Vibrating screen, including a base, a body mounted on the base with a vibrator fixed on whom, a screening surface placed in the body, a supporting plate located at the bottom, rotatable elements from opposite ends of the supporting plate, envelopes of the supporting plate and turning elements, a flexible endless web with protrusions installed with the possibility of translational movement and interaction with the screening surface by means of protrusions, characterized in that, in order to reduce the energy intensity of the vibrating screen, The bed plate is fixed to the body, and the vibrator is positioned for oscillation at an acute angle to the plate. 2, Vibrating screen according to claim 1, characterized in that the flexible endless web is continuous. 71699657 3. Vibrating screen according to claim 1, characterized in that the flexible endless web and support plate are made with holes, 4. Vibrating screens in nil, l and often because the protrusions of the flexible endless web are located with a gap relative to the sifting surface. 5. Vibrating screen according to claim 1, characterized in that it is provided with an additional plate adjacent to the inner surface of the lower branch of the endless web, mounted with the possibility of vertical movement and connected to the supporting plate 20 6. Vibrating screen according to claims 1, 3 and 5, characterized in that eight 0 an additional plate is made with holes. 7. Vibrating screen according to claim 1, characterized in that the bypass. the elements are designed as free-rotating rollers. 8. Vibrating screen according to claim 1, about t l and often because the bypass elements are made in the form of gently curved opposite ends of the support plate. 9. Vibrating screen according to Clause 1, characterized in that the body is mounted on the base by means of elastic supports. 10. The vibrating screen according to claim 1, characterized in that, in order to increase the efficiency of sieving, the screening surface is made in the form of a flexible grid. Fig T I h t | GTTP g IT i i i i i i i i i fesfessfe l sixteen Schig.5 / J FIG. 6  ii / -it shrishiimuzh m dn t tkt pegutm fa and / st / ha ate / PS 78 but tl t HER Fg / e7 2J, 5 I i 5 7 AT -Ch / 3 P B-8 YAEDVBYAi. F 77l Jsi Fie.11