SU586933A1 - Apparatus for air-jet screening of disintegrated materials - Google Patents

Description

(54) DEVICE FOR AIRBREAKING OF CRUSHED MATERIALS

a distribution nozzle 10 is connected to supply compressed air to the internal cavity of the drum. A purge nozzle 11 installed below the screen and used to purge the screen, as well as additional purge nozzles 12 and 13 located above the screen to separate particles of the analyzed material from each other during the screening . An outer casing 14 inside casing 15 interconnected by spacers 16 and forming a cavity, which is connected to an inducer rod 17, designed to remove air with a fine fraction passing through the sieve from under the sieve surface, is attached to the lower part of the body. A filter 18 is installed in front of the booster to separate the material that is fractionated from the air.

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The device operates as follows. The analyzed {material in a uniform layer is laid on the surface of the sieve 4, after which the lid 3 of the upper sifting chamber 2 is hermetically sealed. Then include; the booster rod 17 and the motor that drives the drum 7 in rotation and start sieving. During the rotation of the drum 7 with nozzles, the initially upward directed air jet from the nozzle 11 under the action of dynamic pressure penetrates through and brings some of the material into a sound state. Then, the analyzed material suspended in air as a result of rotation of the drum 7 enters the zone of interaction of air jets emanating from additional nozzles 12 and 13, where material particles are separated from each other. Then, the particles of the material are directed by air jets onto the surface of the sieve, preliminarily cleared of the material by means of the nozzle 11, and sifted through the surface of the sieve in a stream of air leaving into the iodite space and entraining the particles of the sieved fine fraction.

Thus, when the drum 7 is rotated in the proposed device, the layer of particles of the analyzed material is purged periodically on the entire surface of the sieve, sequentially separating all the material particles from each other and further sifting them through the sieve surface free of material. The air leaving into the sub-space with particles of the small fraction is sucked out of the dispersing agent with an inducer of ty 17 through filter 1, B.

The sifted material is collected in filter 18, and the result of sieving is obtained by weighing the residue on sieve 4. Dispersion of the analyzed material is determined, passing identical samples of material alternately, or one of the samples sequentially through sieves with different sizes & ramie 0cheek, starting with the thinnest,.

The number of additional nozzles is set depending on the type, COCTOSH and the degree of aggregation of the material being analyzed, pressure of compressed air, speed of rotation of the drum and other conditions. At. fractionation of fluff pulp after the dry fracture and flocculent pulp after aerofont drying is quite sufficient to install one under the other two additional nozzles. In addition, in the proposed device, several sieves can be installed one below the other with a decreasing cell size from the coarsest to the thinnest, each of which is provided with a set of nozzles ensuring that all the above operations are performed to sift the material through the surface of each sieve. The dispersion composition in this Case is determined in one pass of the analyzed material through the apparatus by sampling and weighing the residue on each sieve.

The proposed device, in contrast to the known, allows sifting the crushed materials that are prone to the formation of aggregates, for example, fluff pulp and flaky pulp in a dry state, effectively and quickly. These advantages of the proposed device allow using it, both for determining the dispersed composition of crushed materials under borator conditions, and as a rapid method for controlling the degree of grinding of various materials directly in the production process.

Claims (1)

Invention Formula A device for 1 air sifting of crushed materials, including a sifting chamber, inside which a sieve is installed, and means for supplying air with a distribution nozzle-i and a blowing nozzle, characterized in that, in order to enable effective sifting of aggregating materials, such as fused the cellulose, the sieve is made in the form of a ring, the air supplying means is installed inside the sieve and is a drum with additional blowing nozzles, with dub Shubarab on in cent56 Re-connectors Distributors Paty-Sources of information, trintied in the nose, and to its side surface blowdown during examination: nye soppo, located under the sieve, and -1 each. P. Kouzov. C) again the analysis of the polar explosive blowing nozzles, the location of the composition of industrial dust and grinding of chewing materials, 5 materials. L., Himi, 1971, p. 102 58693v3 FIG I