SU715137A1 - Planetary centrifugal mill - Google Patents

Description

The invention relates to the technique of fine grinding of various materials and can be used in ceramic chemical, metallurgical and drugi. X industries where it is necessary to obtain highly dispersed powders from materials of high hardness.

Planetary mills are known that contain grinding drums driven in circular rotation by the planet carrier and in rotational movement due to frictional engagement with the inner surface of the housing ij.

However, such mills have a low grinding efficiency in that the grinding process from the initial to the final particle size is carried out under the same grinding conditions by the molar bodies of the same size.

Closest to the proposed technical essence and the achieved effect is a planetary centrifugal mill, containing the situation)

cylindrical housing, inside of which axis is located drove with disks, bearing cylindrical drums with freely located grinding bodies and satellite shtostorni, epicyclic wheel fixedly mounted on the housing, feeder with loading nozzles and drive bSj. However, such a mill has an increased energy consumption for material grinding due to the same conditions of grinding of large and small particles.

The aim of the image is to increase the grinding efficiency.

Claims (2)

This is achieved by the fact that in a planetary centrifugal mill containing a stationary cylindrical body within which the carrier is axially located with disks bearing cylindrical drums with freely arranged grinding bodies and satellite gears on bearings, an epicyclic wheel fixedly mounted on the body loading springs and a drive, the drums are combined into blocks consisting of two located on the same axis and interconnected drums, the drums of the first (along the Container material) grinding stage loaded with grinding bodies larger than drums second milling step. In addition, to implement various mechanical modes of operation of the melting bodies in the first and second stage drums, a stationary centrifugal wheel is mounted in the housing, which is in engagement with the sateplitic gears of the drums of the first grinding stage, and in the second stage of the grinding meshed with an epicyclic wheel. The drawing schematically shows the proposed mill. The mill contains a feeder 1 with loading nozzles 2, cylindrical drums 3 and 4 located in the bearings of the disks 5 of the carrier 6, which together with the feeder 1 is connected to the drive 7. The gears 8 of the drums 3 of the first grinding stage are in engagement with the stationary centrifugal gear wheel 9, and the satellites 1O of the drums 4 of the second grinding stage are engaged with an epicyclic gear 11 fixed on the inner surface of the housing 12. The mill operates as follows. When the carrier 6 rotates from the drive 7, the satellite gears 8 of the drums 3, rolling on the stationary centrifugal wheel 9, force the drums 3 of the first grinding stage; rotate in the same direction as the carrier 6. At the same time, the satellite gears are wrapped around the stationary ring wheel 11, as a result of which the bar 4 of the second grinding stage rotates in the direction opposite to the direction of rotation of the carrier 6. The source material from the feeder 1 through the nozzles 2 enter the drums 3 of the first grinding stage, where they are crushed as a result of the intense impact of large grinding mills, and due to the coincidence and direction of rotation of the drums and drove the resulting force of the grinding medium amplified material as a result of adding the centrifugal forces transmitted by the planet carrier and the wall of the drum. The pre-ground material from the drums 3 passes through the discharge grill into the drums 4 of the second grinding stage. In drums 4, this relatively fine material is intensively crushed due to the use of small grinding media and the implementation of the abrasion mode, which is achieved due to the opposite direction of rotation of the drums 4 and the carrier 6. Thus, the proposed mill allows separating the grinding process into stages and optimizing the flow of each of the stages due to the selection of the work of the grinding bodies and the granular composition of the latter individually for each of the stages, which allows to improve the performance of Nitsa while reducing the specific energy consumption. Claim 1. Planetary centrifugal mill containing a stationary cylindrical body within which the carrier is axially arranged with disks carrying cylinders on cylinders and free-flowing grinding bodies and satellite gears, an epicyclic wheel fixedly mounted on the body, a feeder with loading gear nozzles and a drive, characterized in that, in order to increase the grinding efficiency, the drums are combined into blocks consisting of two axially aligned and interconnected Between the drums, the drums of the first (in the course of the material movement) stage of grinding are loaded with larger grinding bodies than the drums of the second stage of grinding. 2, a mill according to claim 1, in which the stationary centrifugal wheel is mounted in the housing, in engagement with which are the satellite gears of the drums of the first grinding stage, and the drums of the second grinding stage are engaged with epicyclic wheel. Sources of information taken into account in the examination, 1. The author's certificate of the USSR M 137758, cl. O2 C 17 / O8, 1958. 2. USSR author's certificate N9 6Q4578, cl. In О2 С 17/08, 1976. Itc odHMU material л1 vi / l l 4 /