UA9580U - Screen sieve - Google Patents

Abstract

The screen sieve contains elastic cards with slit-shaped openings, which are consecutively fixed with preliminary tension in the supports located along the direction of motion of the screened material and attached to each other by ends. The slit-shaped openings are executed in the form of annular sectors.

Description

Description of the invention

The useful model refers to the technique of separation of loose materials and can be used in 2 mining, metallurgical and other industries.

In the currently existing level of technology, there is a well-known analogue - a screen sieve from the book |(Nadut!y V.P.,

Zolotareva V.P. Polymer sieving surfaces of vibrating screens. - M., Nedra, 1993", p. 122, fig. 12 d.|. This sieve contains elastic cards with holes, which are fixed in supports located along the direction of movement of the crushed material and docked to each other at the ends. These signs of an analogue coincide with the essential features of the useful model 70. In this sieve, the holes are made square. The disadvantage of the analogue is that the square shape of the sieve holes leads to a decrease in the total area of the holes per unit of the sieve area, that is, its useful area.

Prerequisites for reducing this drawback have a prototype - screen sieve according to the patent of Ukraine Mob7З355,

VO781/46 dated September 3, 2003. This screen contains elastic cards with slit-like holes, which are fixed with 72 pretension in supports located along the direction of movement of the screened material and docked to each other at the ends. These features of a prototype are shared with essential features of a utility model. In this sieve, the holes are made in the form of rectangles.

The disadvantage of the screen that is a prototype is also that the rectangular shape of the holes contributes to the fact that particles of the screened material with a larger spread of sizes fall into the space under the screen during screening, which reduces the quality of screening.

The useful model is based on the task of improving the quality of screening while maintaining a high useful area of the screening screen by reducing the dispersion of the sizes of the particles of screened material that fall into the space under the sieve.

The task is solved by the fact that in the screen sieve, which contains elastic cards with 22 slit-like holes, which are fixed with pre-tension in supports located along the direction of movement of the sieved material and docked to each other at the ends, in contrast to the prototype - virgin holes made in the form of ring sectors.

To reduce the concentration of loads at the ends of the ring sectors, these ends can be made rounded. at

For an easier passage of the screened material into the sub-sieve space, ring sectors can be formed with sections of conical surfaces that diverge relative to each other from the sifting surface by the thickness of the elastic cards. at

In order to make it easier for the coarse fraction of the sifted material to pass along the sieving surface of the sieve - d ring sectors can be turned to the side by their convexity; which is opposite to the direction of movement of the resounding 3o material.

To exclude the dead zone in the places of the butt ends of the elastic cards - in the area where the ends of the elastic cards are docked - pairs of internal generating surfaces of the ring sectors are located on two elastic cards. "

In order to increase the useful area of the sieve while maintaining the rigidity of the sieve, ring sectors 8 can be arranged in rows along the direction of movement of the sifted material with a relative displacement of 50 half steps between the ring sectors of adjacent rows. c For a faster entry of the fine fraction of the screened material into the space under the sieve as it

From" movement along the sieving surface - the near ends of the ring sectors can be located on a common tangent in the direction of movement of the sifted material or located with overlapping rows in the direction of movement of the sifted material.

The causal relationship between the set of features of a useful model and the technical result that can be achieved is as follows. 4! In contrast to the prototype - the execution of slit-like holes of elastic cards in the form of ring sectors - reduces the dispersion of the sizes of particles of crushed material that fall into the space under the sieve. This is due to the fact that the particles of the reaming material do not pass into this shape of holes, which pass into the rectangular holes of the prototype by 20 along the larger side of the rectangle. At the same time, a high useful surface area of the sieve is preserved. All this increases the quality of the screening.

Fig. 1 shows the general view of the section of the sieve screen from the side of the sieving surface, Fig. 2 shows a cross-section of the opening on an enlarged scale, Fig. 3 shows a variant of the cross-section along A-A of Fig. 1 on an enlarged scale, on

Fig. 4 shows a version of the joining of the ends of the sieve screen.

Co» The screen sieve contains elastic cards 1 with slit-like openings in the form of ring sectors 2.

The elastic cards are fixed with pre-tension in supports Z, which are located along the direction of movement of the vibrating material and are connected to each other by the ends 4. The annular sectors 2 at the ends are rounded. Annular sectors 2 are formed by sections of conical surfaces 5 and b, which diverge relative to each other from the sieving surface 7 by the thickness of elastic cards 1 (see Fig. 2). Annular sectors 2 by their convexity are turned in the direction that 60 is opposite to the direction of movement of the rattling material (see Fig. 1). In the area of docking of elastic cards 1 with ends 4 (see Fig. 4) - pairs of internal generating surfaces of ring sectors 2 can be located on two elastic cards 1. Ring sectors 2 can be arranged in rows along the direction of movement of the reaming material (see Fig. 1 ) with a relative displacement of half a step between the ring sectors of adjacent rows. At the same time, the near ends of the end sectors for adjacent rows are on a common tangent in the direction of movement of the crushed material or are located with rows overlapping in the direction of movement of the crushed material.

During the operation of the sieve screen, the material to be screened is moved along the elastic cards 1 along the sieving surface 7 along the supports 3. A small fraction of the screened material falls through the holes in the form of ring sectors 2 into the space under the screen.

At the same time, the sections of the conical surfaces 5 and 6 contribute to the easier passage of the crushed material through the ring sectors 2. If on the abutting ends of the 4 elastic cards 1, pairs of internal generating surfaces of the ring sectors 2 are located on two elastic cards 1 (see Fig.

Fig. 4) - in these places, a small fraction of the sifted material also falls into the under-sieve space, which increases the usable area of the sieve.

When a large fraction of the screened material passes along the elastic maps 1, the bulges of the ring sectors 2, facing the direction opposite to the direction of movement of the screened material, contribute to an easier

/about the movement of the coarse fraction along the sieving surface 7. The rounding at the ends of the ring sectors 2 increases the reliability of the sieve, as the contact loads in these places are reduced.

If the ring sectors are arranged in rows along the direction of movement of the screened material with a relative displacement of half a step between the ring sectors of adjacent rows, the useful area of the sieve increases while maintaining the stiffness of the sieve.

At the same time, the effect of increasing the useful area of the sieve when moving the sifted material

7/5 along the sieving surface 7 increases even more if the near ends of the ring sectors for adjacent rows are on a common tangent in the direction of movement of the screened material or are located with overlapping rows in the direction of movement of the screened material.

The shape of the sieve holes in the form of ring sectors reduces the variation in the sizes of particles of sifted material that fall into the space under the sieve.

This increases the quality of the collection.

Claims (7)

The formula of the invention 1. Screening screen, which contains elastic cards with slit-like holes, which are sequentially fixed with pre-tension in supports located along the direction of movement of the screened material and connected to each other at the ends, which is distinguished by the fact that the slit-like holes are made in the form of ring sectors. 2. Screen sieve according to claim 1, which differs in that the ring sectors at the ends are rounded. - C. Screen sieve according to claim 1, which differs in that the ring sectors are formed by sections of conical surfaces that diverge relative to each other from the sieving surface by the thickness of the elastic cards. 4. Screen sieve according to claim 1, which differs in that the annular sectors are directed to the side by their convexity, opposite to the direction of movement of the screened material. 5. Screen sieve according to claim 1, which differs in that in the zone of docking of elastic cards, the ends of pairs of internal forming surfaces of ring sectors are located on two elastic cards. yu 6. Screen sieve according to claim 1, which is characterized by the fact that the ring sectors are arranged in rows along the direction of movement of the screened material with a relative displacement of half a step between the ring sectors of adjacent rows. (is) 7. Screening sieve according to point b, which differs in that the near ends of the ring sectors for adjacent rows are on a common tangent in the direction of movement of the screened material or are located with overlapping rows in the direction of movement of the screened material. " . and? se) 1 (ee) (42) So 60 b5