SU1510952A1 - Separator for granular materials - Google Patents

Abstract

The invention relates to a technique for separating fine-grained materials on sieves and can be used in the milling, grain elevator and animal feed industries, agriculture and other fields. The purpose of the invention is to improve the quality of sifting due to a more uniform distribution of the height of the material on the sieve (C). The screening apparatus of the separator consists of screen bags / SP / 1, rigidly attached along the radius to the distribution cylinder / RC / 2 with a feeder 3. Inside each SP1 there is a vertical flat radial C6, the lower and upper edges of which are inclined, as well as guide plates 7 , uniformly spaced along the height of the cross section of the joint venture 1. The guide plates 7 are set at an angle equal to the angle of inclination of the upper and lower edges C6. The screening apparatus with RC 2 is rigidly mounted on a vertical drive shaft 17. The angle of inclination of the plates 7, the upper and lower edges of C 6 depends on the design and operating parameters of the separator and is 15-45 °. The material is fed into the feeder 3 and through the RC 2 enters the joint venture 1. Under the action of centrifugal inertia force, the material layer moves along the surface C6 progressively, and under the action of the Coriolis inertia force, the material particles are sieved through the holes C6. When the material strength of the material is balanced by the force of rubbing it with C6, a thin uniform layer of material is formed on the surface of C6, which contributes to its better screening. 4 il.

Description

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The height of the cross section of the joint venture 1, the guide plates 7 are set at an angle equal to the angle of inclination of the upper and lower edges of C 6, the sieve apparatus with the RC 2 is rigidly fixed on the vertical drive of the plate 17. The angle of inclination of the plates 7 depends on the design and operating parameters, sep-rator and is 15-45. The material is fed to the feeder 3 and through the RC 2

enters the SP 1. Under the action of the centrifugal force of inertia, the layer of material moves along the surface of the C 6 flow. According to the Coriolis force of inertia, the particles of the material are sifted through the holes of the C 6. When the force of the material is balanced by the force of rubbing it with C 6, a thin uniform layer of material is formed on the C 6 surface, which contributes to its better screening, 4 Il.

. The invention relates to the separation of fine-grained bulk materials on sieves and can be used in the milling, elevator and feed mill industries, in agriculture and other areas.

The purpose of the invention is to improve the quality of sifting due to a more uniform distribution of the height of the material on the sieve.

Figure 1 shows the separator, a vertical section; by plane

rotation through its axis;

figure 2 - separator, top view;

on fig.Z - the scheme of forces acting

on a layer of material with it tilted

movement on the sieve; figure 4 - scheme

force on a layer of material when

balancing strength of body and friction

The separator consists of sieve bags 1 rigidly attached along the radius to the distribution cylinder 2 with a feeder 3. Each sieve bag 1 is made of vertical sidewalls 4, upper and lower bottoms 5, inclined at an angle b to the horizon of 6 s the upper edges of which are inclined at an angle of E to the horizon. To guide the material along the working surface of the sieves and to evenly distribute it over the height of the sieves, the sieve plates 7, also installed at an angle of 0, are evenly distributed along the height of their cross section.

Each sieve bag for feeding

the material on the sieve has a suction inlet 8 with a flange for fastening to the distribution cylinder, and to exit the separated fractions of the material

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Outlet pipes 9 and 10 serve. The feeder consists of distributing channels 11 and a conical surface 12 inclined to the horizon at an angle of 9. Windows 13 are cut in the distribution cylinder to exit the material to the sieve surfaces. Moreover, the window 13 coincide with the inlet pipes of sieve bags. Packages are made - detachable. The sidewall, through which the fine fraction is moved, is opened by means of a hinge 14 and a latch 15.

The distribution cylinder is rigidly plugged at the bottom of the bottom 16, and the latter is rigidly fitted by means of a flange onto the vertical drive shaft 17. Bins 18 and 19 are used to remove the separated fractions.

The elementary layer of the material is affected by the forces G, N, Pc, F, and F (Fig. 3). N Fy 2mcaVpCos6 - normal force

equal to Coriolis inertia:

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Fy pzo r is the centrifugal force of inertia, where r is the distance of the elementary layer of material from the axis of the whelping.

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2fmQVpCOS0 is the sliding friction force acting on the material layer from the sieve surface.

Forces G and equilibrium TC if

G F pSinS; G fNsinS, from here we get

(oV sin6cos0; sin29.

arcsin

five

g

f UVn

where, 81 is the acceleration of the free fall of bodies in a vacuum onto the surface of the Earth} CO is the angular velocity

rotation of the sieve; V yi is the relative speed of movement of the material layer over the surface of the sieve;

f is the coefficient of friction sliding of the layer of material over the sieve surface.

Depending on the ratio of f, CO and Vf, the angle 0 can take values from 15 to 45.

The separator works as follows.

The screening apparatus of the separator rotates on the drive shaft 17. The material is fed from top to bottom into the feeder 3, in which it is distributed through the dispensing channels 11 (according to the number of screen bags), goes beyond the window 13 of the distribution cylinder 2 and enters the receiving ports 8 sieve bags 1. Under the action of centrifugal inertial force, a layer of material moves along the surface of the sieves 6 progressively, and under the action of the Coriolis inertia force, the layer is pressed against this surface in the normal direction, and the particles of material are sieved through the holes. sieve 6. Sifted particles slid along sidewall 4 under sieve 6 and out through pipe 9 into receiving hopper 19. Large (not sifted in) particles move along the surface of sieve and out of sieve

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packages through pipe 10, into the bunker 18.

If we exclude the force of gravity G, only the normal pressing force N will act on the layer of material on the sieve. In this case, the layer of material on the sieve surface is arranged in a thin uniform layer. A diagram of the effect of forces on a layer of material is shown in Fig. 4, where we can clearly see the balancing of the force of gravity G by the projection of the force of friction F sinG on the vertical

G sin6.

You can vary the operating modes of the separators by changing the angular velocity of rotation of the screening apparatus around the vertical axis and the feed rate of the material to the feeder.

Claims (1)

Invention Formula Separator for grain materials, including a central distribution cylinder with a feeder, rigidly attached along the radius to the distribution cylinder sieve bags with internal installed. vertical flat radial sieves and guide plates evenly spaced across the height of the cross section of the sieve bags, characterized in that, in order to improve the quality of separation due to a more uniform distribution of the material along the sieve, the upper and lower edges of the vertical sieves are inclined and The plates are set at an angle equal to the angle of inclination of the upper and lower edges of the vertical screens and are 15 to 45. Frpslne Rtrzgpv