RU177686U1 - MILLER HAMMER TANGENTIAL - Google Patents

Abstract

The utility model relates to devices for grinding materials and can be used in the construction, mining and other industries. The mill contains a housing 1, a nozzle for loading the feedstock, one branch 24. Inside the housing 1 is a rotor 3 with beater. The inner surface of the housing 1 is lined with lining plates of wear-resistant material, made, for example, of steel 30HGSA with hardness HB = 156 ... 217. The blades are installed with a gap relative to the lining plates. The gap value is determined from the ratio: δ / D = 0.015 ... 0.03, where: δ is the gap between the beater and the lining plates, D is the inner diameter of the cylindrical part of the body. In the utility model, the inner surface of the mill is protected from wear. 6 ill.

Description

MILLER HAMMER TANGENTIAL

The utility model relates to devices for grinding materials and can be used in the construction, mining and other industries.

Known hammer mill according to A. St. USSR No. 408652, IPC V02C 13/02, publ. 11/30/1973

This mill contains a housing, inside of which there is a rotor with beats, an input device for supplying raw fuel, a device for returning ground dust, a supply duct and a dust extraction nozzle, while the dust extraction nozzle is located tangentially to the rotor along its rotation, behind which the input fuel input device is mounted, directed towards the rotation of the rotor, and the return device is mounted in the hot air duct.

The disadvantage of this mill is the low efficiency of the grinding process.

Known hammer mill according to A. St. USSR No. 1034767, IPC V02C 13/02, publ. 11/30/1973

The tangential hammer mill contains a cylindrical body, inside of which there is a rotor with beater, a feed pipe for the feedstock and a dust extraction pipe.

The disadvantages of this mill are low productivity and increased wear on the inner surface of the cylindrical body.

Known hammer mill according to A. St. USSR No. 641988, IPC V02C 13/06, publ. 01/15/1979

The tangential hammer mill comprises a housing having a cylindrical part, inside which a rotor with beater is located, a feedstock loading pipe and a branch, while the inner surface of the housing is lined with lining plates made of wear-resistant material.

The disadvantages of this mill are low productivity and increased wear on the inner surface of the cylindrical body.

The tasks of creating a utility model: increasing productivity and reducing wear on the inner surface of a cylindrical body.

Effect: protecting the inner surface of the mill from wear.

The solution of these problems was achieved in a tangential hammer mill, containing a housing having a cylindrical part, inside which there is a rotor with beats, a feed pipe and an outlet, while the inner surface of the housing is lined with lining plates made of wear-resistant material, so that the lining plates are made of steel ZOKHGSA with hardness HB = 156 ... 217, the beats are installed with a gap relative to the lining plates, the value of which is determined from the ratio:

δ / D = 0.015 ... 0.03,

where: δ is the gap between the beats and the lining plates,

D is the inner diameter of the cylindrical part of the housing.

The tangential hammer mill (Fig. 1 ... 6) contains a housing 1 having a cylindrical part 2, a rotor 3 containing a shaft 4. The housing 1 is sealed from the ends by seals 5 and 6.

The shaft 4 is mounted on bearings 7 and 8. The support 7 is made with a thrust bearing 9 (Fig. 3), and the support 8 is with a thrust bearing 10 (Fig. 4).

On the part of the shaft 4 mounted inside the housing 1, the disks 11 are fixed (Fig. 5). On the disks 11, with the help of the fingers 12, beater holders 13 are attached, on which beats 14 are fixed (Figs. 2 and 5).

On the inner surface of the housing 1, including the cylindrical surface 2, the lining plates 15 are fixed. The lining plates 15 are made of wear-resistant material. The lining plates 15 are fastened with bolts and studs. Lining plates 15 can be made of steel 30HGSA GOST 11269-76 with hardness HB = 156 ... 217.

The minimum hardness of the lining plates is limited by the maximum hardness of the material being processed, and the maximum by the fragility of the lining plates 15.

Bills 14 are installed with a gap relative to the lining plates 15, mounted on the cylindrical part 2 of the housing 1 (Fig. 5), the value of which is determined from the ratio:

δ / D = 0.015 ... 0.030,

where: δ is the gap between the beater and the lining plates on the inner surface of the cylindrical part of the housing,

D is the diameter of the inner surface of the cylindrical part 2 of the housing 1.

The optimal value of the gap δ is determined as a result of experimental studies, the results of which are given in table. one.

The shaft 4 is connected through a clutch 16 with an electric motor 17. The electric motor 17 is mounted on the foundation 19 with the help of anchors 18 (Fig. 1).

The housing 1 is connected tangentially to the feed pipe 20, the coolant supply pipe 21, the separator 22, the dust divider 23, at least one outlet 24 and the safety valves 25 (Fig. 2).

The saw holders 13 are mounted on the disks 11 in a checkerboard pattern (Fig. 6). This increases mill productivity, reduces energy consumption and improves grinding quality. In addition, it facilitates the repair work (replacement of ticket holders 13 and beat 14).

Device operation

Tangential hammer mill works as follows (Fig. 1 and 2).

The electric motor 17 is turned on, and through the clutch 16 it drives the shaft 4 of the rotor 3 with the disks 11, on which the bearers 13 and beats 14 are fixed. Then, raw materials in the form of pieces up to 25 mm are fed through the feed pipe 20.

Since the maximum size of the pieces of raw materials is in the range of optimal gaps δ, they are effectively crushed and there is no unreasonable increase in the load on the electric motor 17.

Then, heated air is supplied through the coolant supply pipe 21, which drains the raw materials. The resulting dust enters the separator 22, then to the dust divider 23 and taps 24.

Application of the utility model allowed:

- to reduce the wear of the lining and increase the productivity of the mill due to the optimal gap between the beater and the lining on the inner surface of the cylindrical part of the housing,

- to improve the quality of grinding of raw materials due to the optimal size of the gap between the beater and the lining on the inner surface of the cylindrical part of the housing,

- reduce wear on the inner surface of the cylindrical part of the housing due to the use of the lining.

- to facilitate the repair of the mill (replacing bearers and beaters) due to their checkerboard arrangement in the disks,

expand the product range.

Claims (4)

Tangential hammer mill, containing a housing having a cylindrical part, inside of which there is a rotor with chisels, a feed pipe, one branch, characterized in that the inner surface of the housing is lined with wear plates made of wear-resistant material, lining plates are made of 30KhGSA steel with hardness HB = 156 ... 217, beats are installed with a gap relative to the lining plates, the value of which is determined from the ratio δ / D = 0.015 ... 0.03, where: δ is the gap between the beats and the lining plates, D is the inner diameter of the cylindrical part of the housing.

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