RU2687666C1 - Roller screen - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: invention relates to general machine building, and more specifically to design of mobile roller screen, and can be used for preliminary sorting of mining and sedimentary rocks, coal, metallurgical slag and cleaning of scrap from contaminating inclusions. Roller screen includes at least two sections of parallel rollers installed on support frame with possibility of rotation, each of rolls is equipped with row of fixed along its axis and alternating round disks and shaped discs. Shaped discs are made in the form of curvilinear triangle, each side of which has radius equal to 2/3 of diameter of circumscribed circle of curvilinear triangle, and sides of curvilinear triangle are conjugated by curves with radii equal to 1/5 of circumscribed circle diameter. In one section shaped disks are fixed on each roll with sequential turn of curvilinear triangle vertices by 90 degrees relative to adjacent shaped disk clockwise and shaped disks on each roll are fixed in the same sequence. In the next section, the shaped disks are fixed on each roll with successive turn of the curvilinear triangle vertices by 90 degrees relative to the adjacent shaped disk counter clockwise and the shaped disks on each roll are fixed in the same sequence. Under each rolls on the support frame a scraper manifold is installed, which serves to clean shaped and round disks from sticking material.EFFECT: higher efficiency of the screen, higher degree of sorting of materials with high humidity and contaminated with plastic inclusions.3 cl, 6 dwg

Description

The invention relates to the General engineering, and more specifically to the design of a mobile roller screen, and can be used for pre-screening of rock and sedimentary rocks, coal, metallurgical slag and scrap cleaning from polluting inclusions.

A mobile crushing and screening complex is known, including a frame on which a feeder, a crusher and a conveyor are installed, characterized in that the conveyor is made in the form of a scraper classifier with working and idler branches spaced in a vertical plane from each other, while in the bottom of the scraper classifier-conveyor in certain areas, trapezoidal slits are made at an angle to the direction of movement of the conveyor scraper chain, whose scrapers are made in cross-section t rappeidny form, and under each slit-like classification area installed estrus to divert the flow of sorted bulk material, such as coal (RU 2082507, publ. 27.06.1997).

The disadvantage of this complex is its lack of efficiency associated with the low intensity of the process of separation of the large fraction from the fine and from pollution.

The famous mobile roller screen (PM No. 128522, published on May 27, 2013) contains a frame mounted on a crawler chassis on which the means of processing rock material are mounted, made with the possibility of its separation into fractions and sending the overhead product to the conveyor for feeding to the dump and move the podsitnogo product placed under the means of classification of the conveyor for feeding to another dump. Also, the roll screen is equipped with a power plant for powering the drives of the working equipment and the tracked chassis.

The frame is made of frame. On the frame in its upper part from one of its ends is placed a bunker for filling the rock material supplied to the means of processing rock material, made in the form of at least one two-stage roller screen, made in the form of two sections with rollers located obliquely in the downward direction. Sections are placed between the inclined side walls with wear-resistant lining and made in the form of a set of disc-shaped eccentrics. The tops of the disc-shaped eccentrics on each roll are exhibited along a helical line to move the suprate product toward the side walls and move this product toward the conveyor to discharge the cleaned material into the dump. At the same time, the conveyor located under the two-stage roller screen is communicated with a side extension conveyor for delivering the sub-product to another dump.

The power plant for powering the drives of the working equipment and the crawler chassis is located on the frame frame next to the bunker and is made with the possibility of manual control, housed in a separate cabinet, or remote control.

This utility model allows to increase operational efficiency by providing autonomous mode of operation, the possibility of remote control of the complex and its modes.

However, the main disadvantage of the utility model is the low degree of sorting (screening) of the source material from impurities, including plastic inclusions, such as clay, for example.

The technical result of the proposed invention is to increase the efficiency of the screen by increasing the degree of sorting material with high humidity and contaminated with plastic inclusions, intended for further processing.

The problem is solved in that the roll screen, consists of at least two sections of parallel rolls. The rolls are mounted on the base frame with the possibility of rotation. Each of the rolls is provided with a series of alternating round discs and figured discs fixed along its axis.

At the same time, figured disks are made in the shape of a curvilinear triangle, each side of which has a radius equal to 2/3 of the diameter of the circumscribed circle of a curvilinear triangle. The sides of a curvilinear triangle are conjugate to curves with radii equal to 1/5 of the diameter of the circumcircle.

In one section, figured disks are fixed on each roll with a successive reversal of the vertices of a curved triangle 90 degrees relative to the adjacent figured disk in a clockwise direction. Figured discs on each roll are fixed in the same sequence. In the next section, figured disks are fixed on each roll with a successive reversal of the vertices of a curved triangle 90 degrees in relation to the adjacent figured disk in a counterclockwise direction. Figured discs are also fixed on each roll in the same sequence.

Under each roll, a scraper comb is installed on the support frame, which serves to clean the figured disks and round disks from sticking material.

In the particular case of the parallel roll sections are installed in series in the same plane.

In the particular case of the section of the parallel rolls are installed one below the other in different planes.

The proposed design of the roller screen allows for improved screening efficiency of the source material from contaminants, including plastic, for example, clay inclusions.

The invention proposes a special form of disks in the form of a curved triangle and the resulting spiral arrangement of the protrusions of these disks on the roll allows you to set the direction of movement of the material on the rumble with a certain deviation from the longitudinal, depending on the direction of the spiral. The distance between the face surfaces of the disks on all the rolls due to the curved surface of the triangle and the rotation of the peaks on the roll remains constant, which ensures the constancy of the size of the sorted material passing through the roar.

The use of several sections with opposite spiral arrangement of the protrusions of the disks on the rolls allows you to create a zigzag movement of the material along the screen. This increases the total length of the path of the material on the screen and the duration of exposure to the rolls, which increases the efficiency of screening.

Also, when such a material moves along the screen, not only is it shaken, but the disks are scraped off the stuck dirt from pieces of the material being processed, and the scraper comb installed under the rollers cleans the disks, improving their work efficiency. Taken together, the proposed invention can significantly improve the sorting of the material.

The invention is further illustrated by a detailed description of a specific, but not limiting the present solution, an example of its implementation and the accompanying drawings, in which:

FIG. 1 is a schematic view of the screen from above;

FIG. 2 - a section of the screen;

FIG. 3 - a disk in the shape of a curvilinear triangle;

FIG. 4 - installation diagram of figured disks on the rolls of the screen;

FIG. 5 - examples of the possible placement of sections of the screen;

FIG. 6 - drawings explaining the operation of the screen.

The roll screen according to the invention and shown in FIG. 1 and FIG. 2 consists of rolls 1, mounted on the support frame 2 for rotation. Rolls 1 are axis 3 fixed on frame 2 with figured disks 5 and round disks 6 fixed on it. Axis has a kinematic connection with engine 4. In the specific case the kinematic connection is made in the form of a chain transmission, not shown in the drawings. Axis 3, in the present embodiment of a specific design solution, has a square cross section.

Figured disc 5, a drawing of which is shown in FIG. 3, is made in the form of a curvilinear triangle, each side of which has a radius equal to 2/3 of the diameter of the circumscribed circle of a curvilinear triangle. The sides of a curvilinear triangle are conjugate to curves with radii equal to 1/5 of the diameter of the circumcircle. Each figured disk 5 on the same axis 3 is installed in series with a rotation of 90 ° relative to the adjacent figured disk 5 in one direction, for example clockwise or counterclockwise, as shown in FIG. 4. The placement of figured disks 5 of the stated dimensions and according to the proposed scheme makes it possible to quickly and easily create spirals from the projections of 10 figured disks 5 on the rolls (Fig. 6). The specified ratio for the sides of the discs and the interfacing of the sides of the discs allows to obtain a smooth spiral line, while the material being processed is less beaten and moves more in contact with the surface of the rolls, which improves the cleaning of the material from plastic inclusions.

On adjacent axes 3, the figured disks 5 are located opposite each other, creating cells 7 bounded by the end surfaces of the figured disks 5 and the external surfaces of the circular disks 6, as shown in FIG. 6. By changing the distances between these surfaces, you can change the size of cells 7, thereby adjusting the size of the sorted material. Resizing is possible, for example, by changing the size of the circular discs 6, in particular their outer diameter or thickness of the discs.

Placing in one section 8 several rolls 1 with unidirectional spirals sequentially allows you to create a movement of the processed material in a diagonal direction, as shown in FIG. 4. The next section with rollers 1 with spirals directed in the opposite direction allows creating the movement of the processed material in the opposite diagonal direction. Thus, it is possible to create a zigzag movement of the material being processed, which increases the length of the material along the screen, improves the quality of its sorting even for materials with high humidity.

The optimal number of rolls 1 in one section 8 is from three to six. The next section may be at the same level or be located a level below, as shown in FIG. 5, which simplifies the separation of sorted material and moving it to the dump.

Under the rollers 1, a scraper comb 9 is fixed, as shown in FIG. 2. Installation of the scraper comb 9 allows cleaning of the working surfaces of figured disks 5 and round disks 6 in the process of rattling. This increases the sorting efficiency of the material and the efficiency of the screen as a whole, since there is no need to stop the screen for cleaning off adhering dirt.

The work of the screen is as follows. The material is fed to the surface of the rolls 1 at the beginning of the screen and then moves along this surface. Part of the material, smaller than cells 7, formed by figured disks 5 and round disks 6 of rolls 1, wakes up between rolls 1, the rest continues to move along the upper part until the end of the rumble. Thus, sorting occurs.

The speed of movement of the material is somewhat lower than the peripheral speed of the figured disks 5 and round disks 6 of the rolls 1.

The interaction of the material and the rolls 1, forcing the material to move non-linearly and parallel to the longitudinal axis of the screen, is shown in FIG. 6 and FIG. 7

The protrusion 10 of the shaped disk 5 of the roll 1 by pressing while rotating one edge of a piece of material 11 displaces it not only forward, but also to the side due to the speed difference between the material and the figured disk 5. Accordingly, the next figured disk 5 with the protrusion 10 makes 11 pieces of material 11 however, as a result, the material moves not parallel to the longitudinal axis of the screen, but at a certain angle to it. The direction of lateral displacement is determined by the direction of the helix of the projections of 10 figured disks 5. Obviously, some pieces of material 11 can move parallel to the axis, but most will move with lateral mixing.

In this case, the dirt removed from the material is cleaned with a scraper comb 9.

The proposed design of the screen with a spiral arrangement of the projections of 10 figured disks 5 on the rolls 1 and the presence of a scraper comb 9 significantly increases the efficiency of the screen, allows a high degree of sorting of material with high humidity and contaminated with sticky inclusions, intended for further processing.

Claims (3)

1. A roll screen comprising at least two sections of parallel rolls mounted on a supporting frame so that they can be rotated, each of the rolls is provided with a series of fixed along its axis and alternating round discs and figured discs, characterized in that the figured discs are made in the shape of a curved triangle , each side of which has a radius equal to 2/3 of the diameter of the circumscribed circle of a curvilinear triangle, and the sides of a curvilinear triangle are conjugated with curves with radii equal to 1/5 of the diameter of the circumscribed circle , while in one section the figured disks are fixed on each roll with a successive reversal of the vertices of a curved triangle 90 degrees in relation to the adjacent figured disk clockwise and the figured disks on each roll are fixed in the same sequence, and in the next section the figured disks are fixed on each rolls with successive reversal of the vertices of a curved triangle 90 degrees with respect to the adjacent figure disk in a counterclockwise direction and figured disks on each roll are fixed in one Nakova sequences, wherein beneath each of the rollers mounted on the support frame stripping comb, which serves for cleaning curved and round discs from adhering material. 2. Roller screen according to claim. 1, characterized in that the sections of parallel rolls are installed in series in the same plane. 3. Roller screen according to claim. 1, characterized in that the sections of parallel rolls are installed in different planes one below the other.

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