RU2001700C1 - Screening device - Google Patents

Description

The invention relates to the enrichment of minerals, namely to the separation by size of crushed materials, and can find application in the metallurgical, coal, construction and other industries.

The aim of the invention is to improve the quality of the separation products by uniformly distributing the thickness of the material layer on the screening surface.

Figure 1 shows a screening device, side view; in Fig. 2, section A A in Fig. 1 (transverse section of a unit for connecting several cards); in Fig.3 section B B in Fig.1; figure 4 map, top view; figure 5 section B In figure 4; Fig.6 scan on the plane of a closed screening surface, typed in the form of cards; 7 a diagram of the installation of cards in the supports of the housing; Fig. 8 is a diagram of the oscillations of the protoigit maps with the formation of a gap.

The screening device (Fig. 1) comprises a drum 1 rotatably mounted about axis 00, a continuous along the perimeter of the drum, a sifting surface in the form of a set of elastic cards 2 of width G with holes 3 and a helical spiral located on the inner surface of the drum. Cards 2 of length And between the end stop thickenings 4 with a preliminary tension corresponding to an elongation of A 5 10% are fixed in supports 5, which are made in the form of end flanges located at a distance L and rigidly connected by longitudinal connections 6. On the longitudinal in connection there are ribs 7, which are intermediate supports of the cards 2. In contrast to the prototype, the helical spiral is formed by protrusions 8, continuous in width Г, on the working surface, which are mounted perpendicularly (90 ° to FIG. 5) to the working surface and are oriented underangle a to the longitudinal axis of the OiOi map. The protrusions 8 are placed along the length And periodically with a constant pitch t and the same angle of inclination a. The ends K of the protrusions 8 on one side b of the card are located in the middle between the protrusions Kj on the opposite side bi, and the extreme protrusions K are located at the same distance a from the end of the card.

When installing drum 1, all the odd cards (1 ... 7, Fig. 6) are turned one hundred

with a b in the direction of movement of the material to the discharge end of the device, and an odd side b in the opposite direction. As a result of this, the ends of the protrusions of adjacent cards are aligned, and the protrusions themselves are located one after the other, forming a continuous spiral spiral on the working surface that separates the transport tracks I V.

The device operates as follows.

The source material from the mill enters the loading area sieving surface. When the drum 1 rotates, the material is transported by a helical spiral formed by the protrusions 8 along the tracks IV to the discharge end, divided in the holes 3 of the cards 2 in a known manner. Uneven loading and impacts of large pieces cause additional movements of elastic cards with amplitude f, which help to clear the holes of the 3 cards from particles stuck in them. Due to the design of the card 2 in the form of a monolith with the protrusions 8 forming a continuous spiral on the working surface, the card is moved along with the portion of the screw spiral, as a result of which there is no gap between the card and the screw spiral (screw). Therefore, the fine fractions of the material move strictly between the protrusions 8 along the helical tracks IV, without pouring from one track to another. It is the movement of the material in isolated flows along helical (spiral) paths that ensures, firstly, a uniform distribution of the thickness h of the material on the screening surface and, secondly, increases the length of the path (L of FIG. 6) of the movement of small particles on the screening surface, which contributes to more complete separation of fine fractions. In addition, the implementation of a helical spiral made of an elastic material, such as rubber, reduces the wear of the spiral, ensuring uniform wear of the sieve cloth cards and transporting spirals. At the same time, additional movements of the cards and stops increases the loosening of the material over a larger thickness of the layer, which accelerates the penetration of small particles directly to the holes.

(56) Copyright certificate of the USSR No. 1113184. cl. B 07 B 1/22 1983.

Claims (1)

The claims DEVICE FOR DRAWING, including a rotatable sifting drum of elastic cards, a helical spiral located on the inner surface of the drum, characterized in that, for the purpose of To improve the quality of the screening products, a helical spiral is formed by protrusions made on each card, arranged with a constant step perpendicular to the card surfaces and adjacent opposite ends to the protrusions of adjacent cards. } -. Fie.Z s & e. % g l .and V OOp oOj 2 / j a Figure 1 5th AT 5 S N4, is imthyu csch ff - / v // yo 040 0 in about Iw4 B f WVI m     l .6 42 c ./c, Ј F / i 7 7  U- e Nshtg Y P .. / 3G O O O O O O O S -8 B AND , / tL j kjflja & / tajsha And Ј3 .2, 6 FIG. 7 B