SU1660763A1 - Screen sieve - Google Patents

Abstract

The invention relates to mining technology and is intended for the classification of bulk and lump materials and slurries in mining, metallurgical and other sectors of the national household. The purpose of the invention is to improve the separation accuracy by improving the conditions for the passage of particles of material through the sieve holes. The walls A and B of the openings 2 of the screening surface 1 are formed by longitudinal 4 and transverse 3 bridges (P) and cone-shaped grooves (CV) 5 and 5b located on the opposite side of the working surface of the sieve. Base KV 5 and 5b are adjacent to the side of the hole 2. About one hole 2 sieves m. At least two KVs 5 and 5 are made, and the openings 2 adjacent to the two machines. The tops of the KVs 5 and 5 of the adjacent apertures 2 face each other. At the same time, KV 5.5 m. located on P 3 or 4, or on P 3 and 4, or alternating on P 3 and 4 on adjacent areas of the screening surface 1. Due to the location of KV 5.5 b on P 3 and 4, pairwise particles of the material fall into hole 2 s during classification constant diameter and length. Not less than two short walls B of the opening 2 oscillate with an amplitude exceeding the amplitude of oscillations of the long walls A and the entire screen. This ensures that additional pulses are transmitted to the material particles passing through the openings 2. 4 hp f-ly, 9 ill.

Description

ABOUT

S

what about

The invention relates to mining equipment, in particular to rubber surfaces of vibrating screens, and can be used to classify bulk and lump materials, as well as pulp in the mining, metallurgical and other sectors of the national economy.

The aim of the invention is to improve the separation accuracy by improving the conditions for the passage of particles of material through a calibration channel in a sieve cloth.

FIG. 1 shows a screen sieve, top view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a section bB in FIG. -1; in fig. 4 - screen sieve, top view; in fig. 5 shows a section B-B in FIG. four; in fig. 6 - section G-Y in FIG. five; in fig. 7 and 8 are versions of a screen screen, top view; in fig. 9 - vibrating screen, longitudinal section.

The screen of the screen (Fig. 1) consists of a screening surface (web) 1 with thickness S with holes 2 of size D, the walls of which a and b are formed by transverse 3 and longitudinal 4 bridges. On the underside, opposite the working surface of the AI sieves, there are cone-shaped notches 5, 5 with bases d and apex C. At least one hole 2 of the screening surface 1 has at least two cone-shaped notches 5 and 51 adjacent to the bases not less than the two walls of the hole 2. The tops of the C-shaped grooves 5 and 5 of the adjacent holes 2 on the same jumper facing one another.

Depending on the screening conditions, the depth h and the width B of the groove are taken from the ratios

h (0.3-0.6) S;

B (0.5-0.9) D, where h is the depth of the notch;

S is the thickness of the screening surface;

B - width of the notch;

D - the size of the hole on the working surface of the sieve.

The two walls and the holes have a size equal to the thickness S of the sieve, and the other two b, which are adjacent to the grooves, are size hi, and hi S. At the same time, there is a calibration channel with a constant size D on the length hi, and half of the bridge 3 forming a short wall b is a console with a section I decreasing in length I.

Holes 2 can be made round or other shapes in a known manner.

The notches 5 and 51 (Figs. 1-3) can be located on the transverse webs 3. At the same time, sections OiOi, including tops from the notches, the screening surface are divided into sections of the same thickness S, shaped like tapes 6, oriented across the longitudinal axis OX of the sieve Adjacent ribbons 6 include opposite sides of a and 2 holes and

0, the OiOi lines are bonded to a lower vertical stiffness than the stiffness of the tape 6 itself.

The notches 5 and 51 (Fig. 4) can be located on the longitudinal bridges 4. In

In this case, the belts 7 are connected with a lower vertical stiffness along the OiOi line and are oriented along the OX axis.

The notches 5 and 51 (Fig. 7) can be located on the longitudinal and transverse crossings, while the line connecting the tops from the notches forms a closed contour p, and the area of the sieve inside this contour is in the form of a map 8.

The notches 5 and 51 (Fig. 8) on adjacent parts of the sieve surface can be arranged alternately on transverse 3 and longitudinal 4 jumpers. In this case, the belts 6 and 7, which are movably mounted relative to

0 each other and attachment points, can be located in various places on the screen area depending on screening conditions.

The sieve is fixed in the supports 9 of the box 10.

5 screen (Fig. 9), which is equipped with a vibration exciter 11 and is installed on anti-vibration supports 12.

The sieve works as follows. The source material is supplied to the surface of the AI sieve and, under the action of gravity and inertial forces excited by the vibration exciter 11, moves along it to the loading end, divided into openings 2 into fractions by a known method. Due to the location of the grooves 5 and 51 on the bridges, pairs of material particles in the classification fall into the calibration channel with a constant size D of length hi. He less than two short walls of the channel b adjacent to the surface AL, in contrast to the prototype, oscillate with an amplitude exceeding the amplitude of oscillations of the long walls a and the entire sieve. This ensures the transfer of parts of the material passing through the holes, additional pulses that contribute to pushing them in a channel with a constant size D., which leads to an increase in the accuracy of separation. In addition, the presence on the same level of two short

walls b increases the likelihood of a particle being pinched between walls of different lengths, which also facilitates the passage of particles through a channel with a constant size D.

Due to the separation of belts 6 and 7 (cards 8) due to lesser vertical stiffness than the vertical stiffness of the tapes themselves, due to the pairwise arrangement of the grooves, the sieve sections with vibrations of the box supports 9 can move relative to each other, which further increases the inertial force acting on the particles of the material, thereby improving the conditions for the passage of particles in the calibration channel. In addition, the intensity of loosening of the starting material and, accordingly, the release of fine fractions into the undersize product is increased. At the same time, the relative movement of the strips 6 and 7 (cards 8) perpendicular to the screening surface does not distort the size, D, i.e. the ribbons do not diverge in the plane of the Ap.

Thus, no less than two walls of the sieve are installed with the possibility of additional movement, which contributes to the self-cleaning of the sieve, loosening of the starting material and, accordingly, increasing the effective screening area and separation accuracy.

Claims (5)

1. Screen, including screening surface with holes, the walls of which are formed by longitudinal and transverse bridges and cone-shaped grooves located on the opposite side of the working surface of the sieve and adjacent to the side of the hole, characterized in that, in order to improve the accuracy of material separation due to Improving the conditions for the passage of particles of material through the sieve holes; at least two conical grooves are made near one hole of the screening surface; openings to the walls, with the tops of the cone-shaped grooves of adjacent holes facing one another. 2. A screen according to claim 1, characterized in that the recesses are located on the transverse bridges. 3. A screen according to claim 1, characterized in that the recesses are located on longitudinal bridges. 4. A screen according to claim 1, characterized in that in the area of the screening surface, the recesses are arranged in a closed contour at longitudinal and transverse bridges. 5. A screen according to claim 1, characterized in that the notches in the adjacent areas of the screening surface are alternated on longitudinal and transverse bridges. AA J 82 and 8 -1 1 Schi 1 6-6 Figz Rig.Z 7 i f V Rig. 6 eight eight 8 Fig.7 / h n z. / h 9 2 t T Ltd QQO nenofe,