SU356144A1 - DEVICE FOR FRACTIONING OF LOOSE MIXTURES - Google Patents

Description

The proposed device relates to machines for the separation of raw mixtures and can be used for separation of fractions, iairimer, grinding products of the fepol-formaldehyde resin of the resolute type.

Product 1 grinding fiolform. Depot resins are currently used for the manufacture of artificial materials based on vegetal fibers. The size of the fraction used to transfer plant seabuck plants to the production of raw materials is 0.35-1.5 mm.

The upper limit of the particle size of the working fraction of particles - 1.5 mm is limited by the requirements of GOST. The lower limit of the particle size of GOST allows up to 0.20 mm. However, the selection of particles smaller than 0.35 is difficult in existing maschina due to a sharp deterioration in the permeability of the small fraction, as the sieve holes are clogged. Consequently, the smallest particle size of the working fraction — 0.35 mm — is limited by the capabilities of existing machines.

A device is known for the fractionation of bulk mixtures, for example, products of MOJia with a feiol-formaldehyde smoll of a resol of type, comprising a round sieve case mounted on a frame by

a series of helical springs, a drive made in a forward vibrator with a vertical axis of rising of the unbalances and serving for the sieve of a spatial case of spatial oscillations, feeding device and receivers of separation products. In this device, two sieves are installed to obtain the working fraction — the upper one for the separation of the coarse and the nanotechnology, and the Kie for the separation of the small fraction.

The disadvantage of this device is unsatisfied | ) 11) isolation of the fine fraction from the mixture, a significant amount of which is contained in the grinding product. By reducing the size of the openings of the lower sieve of less than 0.35 mm, the penetration of the fine fraction deteriorates sharply due to clogging of the openings of the sieve, as a result of which the lower sieve may turn out to be inoperable. As the experience of these machines has shown, when fractionating the products of grinding phenol formaldehyde resin, reducing the size of the openings of the lower sieve to less than 0.35 mm makes it possible. And, therefore, a particle with a size of 0.20-0.35 mm, which is allowed by the requirements of GOST for the target working fraction, is completely wasted.

vibrations per minute) and the small size of the sieve holes (approximately 0.35 mm) is not very effective.

The proposed device differs from the known ones in that in the sieve case, instead of the lower sieve, which serves to separate the fine fraction, a friction surface is installed in the shape of a truncated cone. The truncated cone is placed with the bottom base up, and the outer side surface of the cone serves as the working surface. Under the action of spatial oscillations, the mixture, which is placed on a conical surface and contains particles of target and fine fractions, is separated. The small fraction will move up the conic and surface, and the granular working fraction will move down. By changing the parameters and dynamic factors of the device, it is possible to create conditions under which particles of various sizes will not move up along the conical surface that performs spatial oscillations. This creates the opportunity to separate parts from the mixture. The small fraction of the required size.

To ensure the normal operation of the receiver of the fine fraction, which is an inclined chute, it is necessary to attach it to the stationary part of the machine, since when it is attached to the oscillating part, it is possible to move the fine fraction up the oscillating plane of the receiver.

Installing a friction conical surface instead of a bottom sieve can significantly improve the separation efficiency of the mixture, and thereby reduces the “waste fraction of the target fraction. In addition, there is no need for very powerful devices (which simplifies the design of the machine), and also reduces the need for expensive screens.

The drawing shows the proposed device.

The sieve body, with a sieve 2 fixed in it and a friction conical surface 3, is mounted on the vibrating table 4. The vibrating table is mounted on springs 5 installed at equal distances around the circumference and the base plate 6 of the bed 7. a vibrator 8 with a vertical axis of rotation of the unbalance 9. The vibrator is driven to rotate from the electric motor 10. To supply the source material there is a supply device / V, which is located above the sieve, and for receiving the product parameter separated receivers are 12-14. To ensure the "normal operation"

The receiver of the fines fraction 14 is attached to the fixed part of the device.

The mixture is supplied to the separation using guide cones 15 and 16.

The raw material of the filler 11 is fed to the sieve 2. The coarse fraction comes off the sieve and through the receivers 12 is removed from the device, and the mixture passing through the sieve is passed through the cones to the middle part of the conical surface in the form of a ring. Under the action of space vibrations, the fine fraction of the mixture moves up along the conical surface and into the receiver 14, while the granular target fraction rolls down.

down and through receivers 13 is output from the apparatus.

Subject invention

Claims (2)

1. An apparatus for fractionating bulk mixtures comprising a round body with a perforated sheet surface material placed on the frame by means of coil springs, the drive of the body, made in the form of a vibrator with a vertical axis of rotation of the unbalances, loading and receiving devices, characterized in that In order to increase the efficiency of the separation of the fine fraction from the mixture, a separating element in the form of a truncated cone, with the smaller base facing up, is installed in the body under the sieve. 2. An apparatus according to claim 1, characterized in that guide trays are provided between the sieve and the separating element for feeding material into the middle portion of the cone. Melna franci