SU1724369A1 - Mill - Google Patents

Abstract

Usage: in the process of fine grinding of the material. The mill includes a loading device 1, a housing 2c with end caps 3 and 4, a grinding chamber 5 with supports 6 and 7 and a loading device 8 of a drive 9 of a neutralizer 10 made of wear-resistant material and located inside the cover 3. The mill also includes an atomizer of crushed particles made as a conductive sleeve 11 mounted on the insulator 12 and connected to the positive electrode 13, as well as to the insulated central negative electrode 14, which are connected to the corresponding terminals of the rectifier voltages with a voltage multiplier. The magnetic accelerator is made in the form of a pipe 15 from a non-magnetic material. The vortex chamber 16 is made of an insulating material in the form of a torus with internal annular recesses 17, a series of electromagnets 18, 19, 20, 21 are located around pipe 15, each of which is connected in parallel to a direct current source through fully controlled thyristors 22,23 24.25. 4 hp f-ly. 3 il. ate with

Description

The invention relates to processes for grinding a material, in particular to mills for fine and ultrafine grinding.

The purpose of the invention is to increase the fineness of grinding,

Figure 1 shows the mill, a longitudinal section; figure 2 - section aa in figure 1; Fig. 3 shows a section BB in Fig. 1.

The mill includes a loading device 1, a housing 2 with end caps 3 and 4, a grinding chamber 5 with supports 6 and 7 and an unloading device 8, a drive 9 of the neutralizer 10 made of wear-resistant material and located inside the bottom cover 3. The mill also includes an ionizer of comminuted particles made in the form of a conductive sleeve 11 mounted on the insulator 12 and connected to the positive electrode 13, as well as to the insulated central negative electrode 14, which are connected to the corresponding terminals ate voltage with a uum voltage multiplier. The magnetic accelerator is made in the form of a pipe 15 from a non-magnetic material, the vortex chamber 16 is made of an insulating material in the form of a torus with internal annular recesses 17 and is installed under the pipe 15. The magnetic accelerator of charged comminuted particles also includes a series of electromagnets 18-21, each of which are connected in parallel to a direct current source (IPT) through fully controlled thyristors 22-25 with their own control systems. Each series of electromagnets can be made of two pairs of poles P1 and P2, covering the pipe 15, with series-connected windings. Neutralizer 10 of charged particles is made in the form of a conductive fan wheel connected via housing 2 and motor 9 to ground 26.

The mill works as follows.

The material to be further crushed, for example cement, is loaded through the loading device 1, the actuator 9 is switched on and the voltage is applied to the electrodes 13 and 14 from the AML. Electromagnets 18–21 with fully controlled thyristors 22–25 with their control systems SU, tune the control systems of the control system for sequential connection of rows of electromagnets, starting from the top row 21 and ending at about 18, thereby create a traveling electromagnetic field in the pipe 15. The current-conducting fan wheel drives the dust-air mixture in the space between the housing 2 and the grinding chamber 5 from the bottom cover 3 through the holes in supports 6 and 7 to the top cover 4, and from there to the ionizer. Cement particles, entering the ionizer, are split into

ions during the operation of VUM under the action of a discharge between the electrode 14 and the current lead by the sleeve 11 connected to the electrode 13.

The ions are then captured by the electromagnetic field of the accelerator; those. magnetic

field p yes 21,20,19,18. At the same time, it is possible to achieve the speeds of movement of charged cement particles at the exit of the grinding chamber of 15 to 2-5 km / s. The uniformity of the magnetic field strength in each series depends on the number of pole pairs of the electromagnet. Particles moving at high speed, catch the neutral particles, collide with them and grind. Neutral dusty mixture,

passage through the vortex chamber 16 and its annular recesses 17, changes the character and trajectory of movement, which increases the likelihood of collision of accelerated ionized particles with neutral

turbulent motion through the vortex chamber 16.

Then, the ionized particles fall on the front part of the current-conducting fan wheel, where they are neutralized.

and regressed on stress with it. The wheel again throws them out of the cover 3 through the holes in the support 6 into the cavity between the housing 2 and the grinding chamber 5 and further from the cover 4 into the ionizer. Then the cycle is repeated.

Discharge of the crushed material is carried out through the device 8. The mill can operate in cyclic and continuous modes, which is determined

setting up the work of boot 1 and unloading 8 devices. The fineness of grinding can be increased several times depending on the rate of acceleration of ionized particles, which can be adjusted within wide limits by the control system of the CS electromagnets 18-21 by switching them. In addition, a wet grinding method is possible.

Formula and inventions

Claims (3)

1. A mill containing a housing with lids, inside of which there is a grinding chamber mounted on supports, electromagnets with a control system, a direct current source, as well as loading and unloading devices, t and h, which is In order to increase the fineness of grinding, it is equipped with an ionizer of dust-like particles, a magnetic ion accelerator and their neutralizer. 2. Mill according to claim 1, characterized in that the ionizer of dust particles is made in the form of an insulator with a current-carrying sleeve connected to the positive electrode and located in the center of the sleeve of the negative electrode connected to the corresponding terminals of the voltage rectifier with a multiplier voltage wives 3. The mill according to claims 1 and 2, characterized in that the magnetic ion accelerator is made in the form of a tube of magnetic material located inside the grinding chamber, around which electromagnets are arranged in several rows, each row being connected in parallel through the control system to the direct current source, and the electromagnets inside the row are connected in series. 4, The mill of claims 1-3, in which the converter is designed as a conductive fan wheel with a drive, the shaft of which is grounded through the housing. 0 5. A mill according to claims 1-4, characterized in that it is provided with a vortex chamber made in the form of a torus of insulating material with annular undercuts on its inner part and placed 5 between a pipe of non-magnetic material and a fan wheel.