SU1680362A1 - Screen - Google Patents

Description

The invention relates to mining equipment, in particular to stationary screens with a steeply inclined screening surface for thin-layer screening, and m. used in the mining, metallurgical and other industries. Target 2

increase in production and screening efficiency and reduction of power consumption. In the fixed box 1 of the screen, there is a screening surface 2 in the form of elastic elements (E) 3, stretched across the box 1 and fixed on its side walls. Cleaning E 3 from stuck pieces of material is carried out periodically by exciting their vibrations with the help of the bar 7 and the vibration exciter 9 connected to it. Plank 7. located along the duct under E 3 with a ferment relative to them, oscillates in a plane parallel to the plane of the screening surface. When vibrations of the strap 7 stops, located on it, interact with O 3 at least one. 2 hp f-ly, 11 ill.

The invention relates to mining equipment, in particular to stationary screens with a steeply inclined screening surface for thin layer screening, and can be applied in mining, metallurgical and other sectors of the national economy.

The aim of the invention is to improve the performance and efficiency of screening.

Figure 1 shows the rumble, longitudinal section: figure 2 - section aa in figure 1; fig.Z - node 1 in figure 1; figure 4 - node 1 in figure 1 (example of execution); Fig.5 deformation of the elastic elements of the screening surface when the excitation of their vibrations; figure 6 is a section aa in figure 1 (example of execution); in Fig. 7 is a view along arrow B in Fig. 6: in Fig. 8, section A-A in Fig. 1 (an example of execution): in Fig. 9, an elastic element made with a protrusion, a transverse section; in fig. 10 - bar, an example of execution; in fig. 11 - section aa in figure 1 (example of execution).

The screen contains a fixed box 1, in which at a angle of 45-55 ° there is a screening surface 2, made in the form of elastic elements 3, fixed across the box with a preliminary tension on its side walls

1680362 A1

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end supports 4. Under the elastic elements, with a gap relative to them, is installed in the guides 5 and 6, the strap 7 with stops

8, located along the duct 1. Plank 7 is connected to the vibration exciter

9. The distance between the stops 8 along the rod is taken, depending on the design of the elastic element, equal to double step ΐ (Fig. 3) or one step (figure 4) of the location of the elastic elements 3. Along the width of the box 1, the stops 8 can be spaced by In (Fig.6), determined by the ratio

B = (0-25-0,33) (

where ί is the working length of the elastic element

3

The stops 8 (Fig.8) can be installed with the opportunity to interact with the protrusions 10 located on the lower base of the elastic elements 3 (Fig.9). The protrusions 10 can be installed in the middle of the elastic element or placed along its length, and the adjacent protrusions and the cooperating lugs can be shifted in opposite directions relative to the longitudinal axis OX by величинуι = c / 2 (figure 10).

In the upper part of the box 1 there is a loading nozzle 11, and in the lower part of the nozzle 12 and 13 for the removal of separated products,

The roar works as follows.

The source material in the form of a mixture or pulp containing particles of various sizes from the inlet pipe 11 enters a steeply inclined screening surface 2. Under the action of the longitudinal component of gravity and flow pressure, the material in such a layer moves along the fixed box. size on the undersize product, which is removed through the pipe 12, and the above-sieve, removed through the pipe 13. With the blows of large pieces of rattling material, elastic elements 3 they bend by the gap size at the extreme lower position come in contact with the bar 7, which allows increasing the carrying capacity of the screening surface. Due to the installation of elastic elements 3 in the fixed end supports 4, their vibrations caused by the irregular blows of large pieces do not provide cleaning of the holes. Therefore, when the device is operated, the vibration exciter 9 is periodically turned on, and the duration and frequency of switching on are determined depending on the screening conditions, mainly clogging of the holes with particles of material. When moving the strap 7 in the direction parallel to the screening surface, the elastic elements 3 perform more intense oscillations in the HOU plane. Due to this, there is a minimum lateral deviation of the working surface of the elements 3, which prevents separation of the pulp flow from the screening surface and additionally contributes to the improvement of the quality of the separation products.

When installing the stops 8 on the rod with an offset in (FIG. 7), the zone of intensive shaking (shaded area), in which the elastic elements have the maximum amount of movement, additionally increases.

When the stop 8 interacts with the protrusions 10, the elastic elements are additionally subjected to rotary oscillations around their central axis, which enhances their shaking and, accordingly, the effect of cleaning the holes.

The intensity of hole cleaning will additionally increase with the longitudinal shaking of the elastic elements 3. which is realized when the stops of the rotating bar act on the projections 10 (FIG. 11). With this effect, the element 3 is drawn out and, accordingly, the transverse size of the holes increases, which contributes to the release of the stuck particle.

The location of the strap 7 under elastic elements with a gap increases the area of the living section of the screening surface and increases the possibility of relative displacements of the elements when exposed to the process load.

Installing the strap 7 with the ability to interact with the elastic elements at least through one reduces the required tractive force on the vibration exciter 9 and thereby reduces the energy consumed for cleaning the rumble.

Claims (1)

Claim 1, the Screen, including the duct, the screening surface in the form of elastic elements, stretched across the box and fixed on its side walls, the bar installed along the box with the ability to move and interact with the elastic elements, and the vibration exciter of the plate in a plane parallel to the screening surface, exe icha5 1680362 6 In order to improve the performance and efficiency of screening, the bar is located under elastic elements with a gap relative to them, made with stops for interaction with elastic elements and is mounted so that it can be moved along the box. 2. The screen according to claim 1, characterized in that, in order to reduce consumed power, the bar is installed with the ability to interact with elastic elements at least one. 3. The screen according to claim 1, characterized in that the elastic elements are made with projections eccentric with respect to their central longitudinal axes, and the bar is installed with the possibility of interaction with these protrusions. ten A-A 2 1680362 Fig.% ΓΖ / Δ /I '<2222 ( h \ / .to Ζ / X X 'h H / ς one * h _% 3 5 16803.62 Yu 9 41 g to in ^{- l} /....... y - -Ц2 - ' FIG. YU 1680362 FIG. eleven