SU1373457A1 - Arrangement for separating loose materials - Google Patents

Abstract

The invention relates to a device for separating a light, poorly flowing material into fractions, preferably dry, crushed bark, and may. applied in the sawmill, pulp and paper and woodworking industry. The purpose of the invention is to increase the efficiency of separation of materials due to the intensification of the process of removal of small fractions. In the case 1 with the loading nozzle (П) 2 and the unloading П 3 of a large product, a rotating screw (Ш) 4 is installed with a shaft 5 made hollow with the open ends 5. Part of the case 1 and shaft 5 covered by the separation chamber (K) 6 is made with perforation 10. At the same time, K 6 is connected to the suction II of the fan and has a gate. The step of winding W 4 is made variable and in K 6 it is larger than outside it. The crust enters P 2 in the volume completely filling the cross section of W 4. In the K 6 zone with an increased step of winding, the particles of the crust are drawn into rotational motion and blown away mi air. The particles of the fines fraction acquire the speed of the winding, move to the perforation 10, are blown out by air into the K 6 and sucked in by the fan. Particles of the coarse fraction move Ш 4 from the separation zone to П 3. 3 Cp f-ly, 2 ill. l -ij 00 N CA C7I -g | fig1

Description

one

The invention relates to a device for separating a lung with a poor flow of material into fractions, preferably dry, crushed bark, and can be used in the sawmill, pulp and paper and woodworking industries.

The purpose of the invention is to increase the efficiency of separation of sensible materials by intensifying the process of removing fines.

FIG. 1 shows schematically the proposed device, the longitudinal section; in fig. 2 shows section A-A in FIG. one.

A device for separating bulk materials includes a housing 1 having a loading nozzle 2 and a discharge nozzle 3 of a large product, a screw 4, the shaft 5 of which is hollow with open ends, a separation chamber 6 connected to the fan 7 and the nozzle 8 and having a gate 9. In the area of the chamber 6, the housing 1 and the shaft 5 are made with perforations 10 located along the entire cylindrical surface of the shaft and the housing. The screw 4 has three working zones. The first zone transporting the material from the filling nozzle 2 to the separation chamber 6 is coiled in steps of S | 0,8D. The second zone is in the middle of the length of the screw 4, on the length of the separation chamber 6 and has a winding pitch Sj 1,1D. The third zone is unloading, has a winding pitch S, 0,6D (D is a screw diameter 4). All three zones of winding smoothly transition from one to another using turns with intermediate steps, for example S

The device works as follows.

The dry ground bark enters the filling nozzle 2 in the volume completely filling the auger section. Blades 4 augers push the bark into the separation zone, i.e. in the zone of the chamber 6. In the separation zone, the step of winding is increased and, consequently, the filling of the screw 4 is reduced, the particles of the material acquire greater freedom of mutual movement. As the pitch increases, the area of the passive area of the screw 4 increases, a part of the material is involved in the rotational movement and transferred through the shaft 5 of the screw. This circumstance also contributes to the movement of particles.

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from the center to the periphery of the screw and, consequently, to the perforated part of the housing 1. The fan 7, creating a vacuum inside the chamber 6, draws air into the hollow shaft 5 of the screw 4. Air entering through the perforation of the shaft 5 into the housing 1 additionally loosens material. In this way, the influence of three factors: an increase in the screw winding pitch, loosening by rotation, and blowing air into the volume of the bark conveyed by the screw creates favorable conditions for the particles to become suspended.

Covering the gate 9 increases the vacuum in the chamber 6, and consequently, the purging of the mass of material in the azo-20 does not separate. The fine particles acquire the speed of turning, move to the holes 10 of the perforations of the housing 1 and are carried by a jet of air into the separation chamber 6, then

25 are sucked in by the fan 7 and released into the pneumatic conveying system (not shown). Large particles can not penetrate through the holes 10 with a diameter of 5-6 mm in the housing 1 and

30 advance the blades 4 screws from the separation zone to the discharge zone. In the discharge zone, the remaining material is re-compacted due to decreasing pitch Sj of the screw 4 and

3g forms a kind of plug that prevents air from breaking out from the discharge pipe 3 into the separation zone, and thereby improves the working conditions of the separation chamber 6.

40 The vacuum and the degree of purification from the fines is regulated by the position of the gate 9. The sorted coarse fraction is discharged from the discharge port 3.

45 The use of the proposed device makes it possible to increase the efficiency of separation of bulk materials by more complete removal of the fines.

50

Claims (2)

1. A device for separating bulk materials, comprising a housing 55 with loading and unloading nozzles and a screw auger with a shaft mounted therein for rotation, made in variable pitch, characterized in that Due to the efficiency of separation of bulk materials due to the intensification of the process of removal of fine fractions, the device is equipped with a separation chamber covering a part of the body, with parts of the body and the auger shaft located in the separation chamber perforated into the separation chamber. the suction nozzle of the fan, and the screw shaft is hollow with open ends. 2. A device according to claim 2, characterized in that the step of winding the screw in the separation chamber is greater than outside the chamber. fig.g