SU1523194A1 - Apparatus for sieving loose materials - Google Patents

Abstract

The invention relates to a technique for sifting bulk materials and can be used to separate fine particulate materials with enhanced adhesion, for example, in manufacturing processes for preparing powdered plant protection products. The purpose of the invention is to improve the performance of the device. Along the axis of the drum sieve (BS) 4, a drive shaft 2 with a helical coil (BC) 3 mounted on it is placed and connected to the BS 4 via flexible couplings. At the same time, BS 4 has a frame made in the form of two coaxial rings 5 and 6, interconnected by longitudinal ribs 7, fastened together on the inner surface of the BC 8. The pitch of the BC 8 is equal to the pitch of the BC 3. By means of roller supports 11 from BS 4 connected to the vibrator 13. In the upper part of the device case 1 parallel to the generatrix of the BS 4, brushes are fixed to clean the BS 4 cells during operation. The screening material inside the BS 4 simultaneously with its movement along its axis by means of the sun 8 is constantly and vigorously shaken due to the vibration of the BS 4, excited by the vibrator 13 through the roller bearings. The brushes continuously rotate as the BS rotates by engaging the bristle with its cells and the elastic force of the bristles to clean the cells. 2 Il.

Description

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The invention relates to a technique for sifting bulk materials and can be used in various folk industries to separate fine particulate materials with enhanced adhesion, for example, in manufacturing processes for preparing powdered plant protection products.

The purpose of the invention is to improve the performance of the device.

FIG. G shows the device, longitudinal section; in fig. 2 is a sectional view in FIG. one.

The device comprises a housing 1, inside of which a drive shaft 2 is mounted on supports with a spiral helix 3 mounted on it. Shaft 2 is placed along the axis of the drum sieve 4, which has a frame consisting of two rings 5 and 6 connected by longitudinal ribs 7, fastened together by the inner surface of the helical guide spiral 8, having a pitch equal to the pitch of the spiral spiral 3, and connected to it by flexible couplings 9, evenly spaced around the circumference and the length of the drum sieve 4. On the frame of the drum sieve 4 is outside reinforced cylinder - Riches cue screening element 10. Rings 5 and 6 drum sieves 4 have ring shelves placed with a small gap between the pairs of rollers of four roller supports 11, on which frame 12 with a vibrator 13 is mounted. Frame 12 is connected to case 1 by flexible suspensions 14, which balance the weight frames with a vibrator, which reduce the radial loads on the drum sieve 4. In the upper part of the body 1 parallel to the drum sieve 4, two cylindrical rods 16 are hinged on the brackets 15, whose pads are in engagement with the cells the screening element 10, freely rotating on its axis, together with the rollers 17, resting on the annular shelves of the rings 5 and 6 and limiting the depth of the bristles in the cells of the screening element 10. In the lower part of the housing 1 under the drum sieve 4 there is a casing 18 for sprinkling the fine fraction bulk material, and under the output section of the drum sieve - casing 19 for pouring coarse fraction. At the end of the housing 1, a nozzle 20 is mounted inclined to dump the screened material into the lower part of the internal cavity of the drum sieve 4. To prevent spillage of the screened material from the inlet end of the drum screen, a cone-shaped reflector 21 is mounted on the ring 5.

The device operates as follows. The vibrator 13 is turned on and the drum sieve 4 is driven into the electrical system. The material being sifted through the nozzle 20 continuously flows into the lower part of the internal cavity of the drum sieve 4, is caught by the spiral guide coil 8 and, sieved, moves along the axis of the drum sieve wherein the layer of the screened material is equalized due to the vibration of the drum screen 4 in the vertical plane and the working surface of the screening element 10 is used as much as possible for the screening. A portion of the screened material during the rotation of the drum sieve 4 by the longitudinal ribs 7 rises from the bottom of the drum sieve 4 and then drops down from them, improving the mixing. At the same time, the screened material inside the drum sieve 4 simultaneously with its movement along its axis is constantly and vigorously shaken due to the vibration of the drum sieve 4, excited by the vibrator 13 through the roller supports 11 and the frame 12. The cylindrical brushes 16 rotate continuously as the drum sieve 4 rotates the engagement of the bristles with the cells of the cylindrical screening element 10 and the elastic force of the bristles clean the cells, which allows maintaining the performance of the device during its operation at a high level. During operation of the device, the detached fine fraction of the bulk material is continuously poured into the casing 18, and the coarse fraction from the output slice of the drum sieve 4 is poured into the casing 19.

Claims (1)

Invention Formula A device for sifting bulk materials, including a drum screen on a frame installed between two coaxial rings, flexible connections and a drive shaft, characterized in that, in order to increase the performance of the device, it is equipped with a vibrator connected by roller bearings to a drum a sieve, a helical coil placed on the drive shaft, and brushes to clean the cells of the drum sieve during operation, while the frame of the drum sieve is made in the form of longitudinal ribs connecting the rings an inner surface of the helical guideway helix, which is schag step helix screw drive shaft, wherein the drive shaft is placed on the sieve drum axis and connected thereto by flexible bonds. 15