SU1373433A1 - Centrifugal mill - Google Patents

Abstract

The invention relates to the field of agricultural engineering, namely to the design of devices for grinding brittle materials, and reduces the energy intensity of the grinding process and ensures the stability of the centrifugal mill. The mill contains grinding chamber 1 and regrinding chamber 2 with accelerating disks 5 and 6, decks 7 and 8, a common sieve 14 for grinding and regrinding chambers installed in the outlet pipe 13 and connected to the discharge connections 10 and 11 and the discharge device 12 in the form cumulative capacitance with level sensors 17 and 18. The acceleration disks of the grinding and regrinding chambers are mounted on vertical shafts 3 and 4 and have an independent drive. 1 il. with

Description

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The invention relates to equipment for crushing and grinding materials, namely centrifugal crushers for grain and other brittle materials, and can be used in production lines of feed mills, feed processing plants, in the preparation of mineral fertilizers from metallurgical slags.

The purpose of the invention is to reduce the energy intensity of the grinding process and ensure the stability of the mill.

The drawing shows a centrifugal mill, a general view.

The centrifugal mill contains a grinding chamber 1 and a chamber 2 to

but on the vertical shafts 3 and 4 there are fastening disks 5 and 6 of the fan wheel type, surrounded by the fender decks 7 and 8. In the lower part of the grinding chamber 1, there is an annular trap 9 heavy impurities. The discharge pipe 10 of the grinding chamber, the discharge pipe 1 1 of the regrinding chamber and the loading device 12 are combined and

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Rui begin to flow evenly large particles. They acquire greater speed than in the grinding chamber due to the greater frequency of rotation of the accelerating disk 6, hit the deck 8, collapse and reload the sieve 14 on the discharge nozzle 11.

The grinding process is repeated until the particles reach a predetermined size determined by the diameter of the sieve holes 14. When the number of large particles decreases to the level of the lower sensor 18, the accelerating disk of the grinding chamber is turned off until the large particles again accumulate top sensor level.

Separating the drives of the accelerating disks of the grinding and regrinding chambers allows regulating their circumferential speeds in order to perform the working process more efficiently in a centrifugal mill, since the optimal impact speeds in the grinding and regrinding chambers depend on the physical properties of the materials being crushed. Opti Criterion

communicated with the outflow pipe 1330, the specific flow rate through the flat sieve 14, opposite to which the movable guide valve 15 is installed. The grinding chamber has a loading nozzle in the form of a hopper 16, and the loading device is.

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Station 12 is a regrinding chamber in the form of a storage tank with the upper 17 and lower 18 level sensors.

Centrifugal mill works as follows.

The source material from the hopper 16 enters the acceleration disk 5 of the grinding chamber, acquires speed, hits the deck 7 and collapses. Severe impurities fall and accumulate in the B ring catcher 9. Destroyed particles are directed by air from the grinding chamber to the unloading pipe 10, slide into the guide flap 15 and fall onto the sieve 14. The particles that have passed 50 through the sieve (finished product) are transported along the discharge pipe 13, and large particles are sent to the storage capacity of the loading device 12, 55 are accumulated therein to the upper level sensor 17. Thereafter, the acceleration is turned on ;; the claim 6 of the regrind chamber, in which energy.

With the proposed design of the mill, there is no need to manufacture accelerating disks of different diameters. The installation of the storage tank above the regrinding chamber ensures the stability of the centrifugal mill operation in case of a large fraction of the coarse fraction on the regrinding. In addition, it becomes possible to determine the amount of the steep fraction entering the secondary grinding, and on this basis, establish the desired centrifugal mill performance by changing the feed of the starting material into the grinding chamber.

The installation of level sensors ensures that the acceleration disk of the regrind chamber as regards the need for regrind is put into operation. This is especially useful when the fragile material is crushed and its particles reach a predetermined size in the grinding chamber. In this case, the accelerating disk of the regrinding chamber turns off from work, no energy is consumed at idle, which is proportional to the specific flow rate

energy.

With the proposed implementation of the mill, there is no need to manufacture accelerating disks of different diameters. The installation of the storage tank above the regrinding chamber ensures the stability of the centrifugal mill operation in the event of an uneven arrival of the coarse fraction on the regrinding. In addition, it becomes possible to determine the amount of coarse fraction entering the additional grinding, and on this basis to establish the desired performance of the centrifugal mill by changing the feed of the starting material into the grinding chamber.

The installation of level sensors ensures that the accelerating disk of the regrind chamber is turned on as the regrind is necessary. This is especially useful when the fragile material is crushed and its particles reach a predetermined size in the grinding chamber. In this case, the accelerating disk of the regrinding chamber is switched off from work, energy is not consumed for idling, which is proportional to the peripheral speed in the cube of the accelerating disk.

Thus, an independent drive of the accelerating disks of the grinding and regrinding chambers and the installation of a storage tank with level sensors reduce the specific energy consumption and ensure the stability of the centrifugal mill operation.

Claims (1)

Invention Formula Centrifugal mill containing grinding and regrinding chambers with horizontal acceleration discs and with fender decks, the loading device and the discharge nipple of the regrinding chamber are connected to the discharge nipple of the grinding chamber and communicated with the discharge pipe through a flat sieve, in order to reduce the energy intensity of the grinding process and ensure the stability of its operation, The re-grinding chamber boot device is complete in the form of a storage tank with level sensors, and the grinding disks of the grinding and re-grinding chambers have an irresistible drive.