RU2345847C1 - Screen - Google Patents

Abstract

FIELD: mechanics, mining.

SUBSTANCE: screen comprises a case with a vibration drive mounted onto the support via flexible shock-absorbers, a screen and a pan furnished with strikers intended for cleaning the screen representing the hinged plates arranged in rows perpendicular to the case boards under the screen. Note that the centers of gravity of the said plates are, in turns, shifted by equal amount to opposite sides of the suspension axes.

EFFECT: higher efficiency of screening and screen cleaning.

3 dwg

Description

The invention relates to devices for classifying granular material by size, and more specifically to screens, which can be most widely used in the mining and construction industries.

Screening efficiency depends on the frequency, amplitude and shape of the vibrations. However, the sieve cells are still clogged with difficult grains. To reduce this drawback, shock elements are used in the form of balls, tubes, strings, which, due to their inertia force, striking the sieve, knock out difficult grains from the cells. However, each series of strokes occurs once in one cycle of the oscillation of the screen, in particular, at the moment when the movement of the screen is directed downward.

The GTS multi-sieve vibrating screen is known (L.A. Vaysberg et al. “Screening of the surface of screens”, VSEGEI, St. Petersburg, 2005, p.114 and 116, fig. 2.81 a and 2.82), containing decks installed on the frame, equipped with sieves and pallets on which polyurethane balls are freely placed. The screen frame is equipped with self-synchronizing vibrators, and when it moves up, the sieve moves down, and the balls move up, hitting the sieve from below and providing partial cleaning of its cells.

The disadvantage of this screen is the wear of the balls and their getting into the product, as well as damage to the sieve due to local blows to it by balls.

Known adopted for the prototype screen Cleaner Clip Clean (L.A. Vaysberg et al. "Screening surfaces of screens", VSEGEI, St. Petersburg, 2005, p.127, Fig.2.90), containing mounted on a support through elastic shock absorbers box with a vibration drive, a sieve and a pallet on which shock elements for sieve cleaning are placed, made in the form of polyurethane balls suspended on polyurethane threads fixed to the box. Balls and threads are made in the mold as a whole and are an elastic system. As in the previous analogue, balls hit the sieve only once during the period of rocking of the screen and at the same time always at a certain place in the sieve, which retains the disadvantages of the analogue.

The objective of the present invention is the creation of a screen with a screening efficiency of up to 90% by increasing the intensity of cleaning the sieve cells.

Another objective is the creation of cleaning elements that do not damage the sieve and provide twice as many hits on the sieve for one period from each element.

The tasks are solved in a screen containing a box mounted on a support through elastic shock absorbers with a vibrating drive, a sieve and a pallet, on which the shock elements for cleaning the sieve are suspended, in which, in accordance with the present invention, the shock elements are made in the form of plates arranged in rows suspended pivotally on the axes fixed to the sides of the box under the sieve, while the centers of gravity of the plates are alternately shifted in each row by the same amount in different directions relative to the suspension axes.

Figure 1 shows the inventive screen in a longitudinal section, figure 2 is a top view without a sieve, and figure 3 (a, b, c) shows the different phases of the position of the shock plate for one cycle of screen vibrations.

The screen (FIGS. 1 and 2) contains a box 3 mounted on a support 1 through elastic shock absorbers 2, having a drive vibrator 4, a sieve 5, a pallet 6 and shock plates 7 suspended from the axles 8, fixed to the box 3 perpendicular to its sides 9. Plates 7 are suspended in rows from axes 8 in such a way that their centers of gravity 10 do not coincide with axes 8. Moreover, the plates 7 are placed on axes 8 so that their centers of gravity 10 are displaced relative to the axes in different directions alternately in each row and by the same amount .

The roar works as follows. When the drive vibrator 4 rotates, the box 3 receives circular vibrations. Together with it, the sieve 5 and all other parts fixed on the box receive the same movement. The source material enters the sieve 5 and moves along its inclined plane to discharge. The oversize product is unloaded from the sieve 5, and the under-sieve product passing through the sieve is unloaded from the pallet. “Hard grains” of material can get stuck in sieve cells and reduce screening efficiency. The shock plates 7 during circular vibrations of the screen receive the movement shown in figa, b, and C. Fig. 3a shows the neutral position of the plate 7, Fig. 3c shows the position of the plate when the screen moves upward, if its center of gravity is located to the left of axis 8, and Fig. 3c shows the position of the plates when the screen moves down. Thus, in one period, one plate inflicts two blows on sieve 5 in different places. Since the centers of gravity of the plates 7 in each row are successively shifted in different directions from the axes, the shocks create wave-like oscillations of the sieve, which additionally positively affects the efficiency of cleaning it.

The proposed constructive solution allows to increase the screening efficiency of more than 90%.

Claims (1)

A screen containing a box mounted on a support through elastic shock absorbers with a vibrating drive, a sieve and a pallet, on which shock elements for cleaning the sieve are suspended, characterized in that the shock elements are made in the form of plates placed in rows, hinged pivotally on axes fixed perpendicular to the sides box under the sieve, while the centers of gravity of the plates alternately in each row are shifted by the same amount in different directions relative to the axes of the suspension.

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