SU1806015A3 - Crushing device - Google Patents

Description

The device relates to the technique of grinding. production, mainly sublimation products, and can be used to obtain fine powder from raw materials of plant origin.

The purpose of the invention is to improve the grinding quality of sublimation products.

The purpose of the invention is achieved in that the device is equipped with a nozzle for supplying a cryoagent mounted on the housing cover. and a fan fixed in front of the dismembrator on its shaft, the fan blades being located at the base of the nozzle for supplying the cryoagent.

The introduction of a fan into the device, the blades of which are located at the base of the cryoagent supply pipe, makes it possible to pump gaseous cryoagent into the grinding zone, grinding the sublimation product in a cryogenic medium allows solving the problem of the maximum preservation of the properties of the initial product in the finished product, because heat generated during grinding, leading to overheating and deterioration of the product quality, is selected by a cryoagent.

1806 015 AZ

In addition, the fan creates a top-down flow of a gaseous cryoagent, which not only cools the product, but also creates excess pressure, which crushes the crushed product into the grinding zone and compacts it. This allows you to reduce the time of destruction of the product, which plays an important role in grinding.

The drawing shows a diagram of a device for grinding.

The device comprises a heat-insulating housing 1. in which the grinding part is located, consisting of two sequentially located dismembrator and cone crusher for preliminary and final grinding, respectively.

The dismembrator consists of a conical body 2 with three inserts evenly spaced around with fixed knives 3 and a shaft 4 with a rotor 5, on which three groups of movable knives are fixed 6. Knives 3 and 6 are mounted perpendicular to the cone forming body 2 with a variable pitch, and during rotation shaft knives 6 are included in the gap between the knives 3.

A fan 7 is located in front of the dismembrator on its shaft 4. Its blades are located at the base of the loading nozzle 20 for supplying the cryoagent.

In the upper part of the insulated housing 1 is a loading hopper 8 with a hinged lid 9.

Cone crusher contains fixed 10 and movable 11 cones. The fixed cone 10 is attached to the housing 12, and the movable cone 11 is attached to the shaft 13 through the rolling bearings 14. Mounting in a spherical bearing 15 allows the shaft 13 to deviate from the vertical axis by an angle sufficient to run the movable cone 11 around the stationary 10. Oscillations of the movable cone are created by an unbalanced type vibrator 16, consisting of two identical unbalances, one of which is fixed on the lower end of the shaft 13 and through the flexible elements transmits rotation to the lower unbalance installed through the bearings on the shaft 17 of the lower casing 18. not interfering with the oscillation of the shaft.

This design of the vibrator allows to a large extent with the lower unbalance to compensate for the vibration of the cone mill caused by the upper unbalance. The magnitude of the crushing force can be adjusted by changing the mass of the vibrator 16, changing the number of cylindrical liners 19 and changing the frequency of rotation of the shaft. The cryoagent is supplied through the pipe 20 in the grinder cover 21. ,

The shafts of the dismounter and the cone grinder are located on the same vertical axis, are mounted in rolling bearings and are interconnected by a cardan shaft 22. The vibratory cone mill is mounted on three posts 23 through rubber shock absorbers 24, and the demister is installed on three posts 25 through heat-insulating fluoroplastic bushings 26.

At the bottom of the device there is an outlet 27..

Product temperature control is carried out by a resistance thermometer mounted on the cone chopper body.

During the operation of the grinder, the product enters the loading hopper 8. located in the upper part of the grinder, then into the disassembler, consisting of fixed 3 and movable 6 knives, where preliminary grinding is performed. It is known that the degree of grinding. _Rmaks ymaks Omake wherein diameter ^_ maximum piece for grinding;

ymax - the diameter of the maximum piece after grinding.

Sublimation product powders require a high degree of grinding. For example, to obtain dry drinks, a powder with a particle size of not more than 20-50 microns is needed. With receipts on. the input of the product with a diameter of 20 mm, the degree of grinding should be

Obtaining high dispersion at one degree of grinding is almost impossible. Due to their design features, the shredders work effectively with limited degrees of grinding, and therefore it is advisable to grind the material from the original size to the required in several sequentially operating devices.

When grinding sublimation products to obtain dispersion

0.02 ... 0.05 mm, it is advisable to have the original product with a particle size of not more than 2 mm.

Then the degree of grinding:

Therefore, for pre-grinding in the proposed device for the economic and effective use of the 'electric drive, a dismembrator is used. The particle size at the output of the dismembrane is 5 RA 1-2 mm. The dismembrator grinds and evenly distributes the product along the receiving annular gap of the cone crusher formed by the stationary 10 and the movable 11 cones. When the de-balancing vibrator 16 is rotated, a centrifugal force is created, forcing the movable cone to run on the stationary 10 without a gap, if there is no crushed product, or through the product layer in the working mill. The grinding of the product occurs continuously, because at any position of the movable cone 11, there is always a contact point between the cones 10 and 11 at which grinding occurs. 20 The impeller of the fan 7 creates a top-down stream of cryoagent vapor entering through the pipe 20 located in the upper part of the heat-insulated casing 1. This stream is combined with the action of gravity and ensures the product moves from cool the product to embrittlement, which allows to maintain the quality of the crushed product and reduce energy costs

The implementation of the device in accordance with the claims allows to increase the efficiency of crushing by improving the quality of the finished product and reducing the consumption of cryoagent and energy, due to the compaction of the crushed product and cooling it with a downward flow of cryoagent vapor.

Claims (1)

Claim A grinding device comprising a housing with a lid and an outlet, a pre-chopper in the form of a dismembrator and a final chopper, a feed hopper and a drive, mounted on the same vertical axis, characterized in that, in order to improve the quality of grinding of sublimation products, the device is equipped with a feed pipe for feeding cryoagent installed in the housing cover and a fan mounted in front of the dismembrator on its shaft, and VNIIIPI of the State Committee for Inventions and from to the premises under the State Committee for Science and Technology of the USSR 113035. Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhhorod, 101 Gagarin St.