CN1073890C - Magnetic screening machine - Google Patents

Abstract

The invention relates to a magnetic screening machine which is suitable for screening and magnetic separation of fine-grain magnetic materials, in particular to preparation of ultrapure magnetite powder. The invention comprises the following steps: alternating magnetic system, axle, select board, feed box, non-magnetic material box, unload the roller, its characterized in that: a screen is arranged on the outer side of the cylinder type selecting plate and is arranged in an alternating moving magnetic field acting area; a gap is reserved between the cylinder type selecting plate and the alternating moving magnetic system, and the cylinder type selecting plate and the alternating moving magnetic system mutually move relatively. Compared with the prior art, the magnetic material screening and magnetic separation device can realize the simultaneous screening and magnetic separation of magnetic materials by one machine, and has the characteristics of high screening and magnetic separation efficiency and long service life of a screen.

Description

A magnetic screening machine

The invention relates to a magnetic screening machine, which is suitable for screening and magnetic separation of fine-grained magnetic materials, and is especially suitable for the preparation of ultra-pure magnetite powder.

Traditional screening operations generally use mechanical force to generate vibration, rotation or shaking to loosen the material layer. The material particles use their own weight to pass through the screen holes to achieve the purpose of screening. The screen wears seriously and the screen is easy to block. The efficiency is low. In the traditional magnetic separation operation, due to the low magnetic tumbling efficiency of the material, it is difficult to destroy the magnetic agglomeration of the material, so that the selected minerals are mixed with some non-magnetic materials, especially the minerals that are associated with non-magnetic materials are more difficult to separate. .

The purpose of the present invention is to overcome the shortcoming of above-mentioned technology, propose a kind of magnetic screening machine that carries out screening and magnetic separation of material simultaneously by means of the effect of alternating magnetic field.

A magnetic screening machine, comprising:

- Alternating magnetic system, the alternating magnetic system is fixed on the shaft and placed inside the selection plate, and the magnetic poles of the alternating magnetic system are arranged alternately along the circumferential direction N and S;

- Shaft, the shaft is fixed and supports the alternating magnetic system, the two ends of the shaft are fixed on the bracket by means of bearings and bearing seats, and the shaft is driven by the motor;

- selection board, the selection board is a cylindrical selection board, which is fixed on the outside of the alternating magnetic system, and the axis of the cylindrical selection board is the same as that of the alternating magnetic system;

- a feed box arranged in the upper part of the screen;

- non-magnetic material gold, the material box is arranged under the selection board;

- a magnetic material box, the material box is arranged on the side of the non-magnetic material box;

- discharge roller, the discharge roller is arranged in the ore discharge area;

It is characterized by:

a. There is a screen on the outside of the cylindrical selection plate, and the screen is placed in the alternating magnetic field action area;

b. There is a gap between the drum type selection plate and the alternating magnetic system, and the two interact with each other to move relative to each other.

The alternating magnetic system can also adopt the alternating magnetic system composed of a grooved iron core embedded with three-phase AC windings.

The alternating magnetic system can also be made into a planar magnetic system.

Due to the adoption of the above-mentioned technical scheme, compared with the prior art, the present invention can realize the screening and magnetic separation of materials at the same time in one machine, and has the characteristics of high screening and magnetic separation efficiency and long service life of the screen.

Figure 1 is a schematic diagram of a magnetic screening machine.

Fig. 2 is a schematic diagram of a three-phase AC alternating magnetic system.

Figure 3 is a planar magnetic screening machine diagram.

The present invention is further described as follows in conjunction with accompanying drawings.

The present invention integrates the screening device and the magnetic separator to realize the simultaneous screening and magnetic separation of materials in one machine.

A magnetic screening machine, comprising: an alternating magnetic system 4, the alternating magnetic system is fixed on the shaft 8 and placed in the selection plate 3, and the magnetic poles of the alternating magnetic system are arranged alternately along the circumferential direction N and S; the shaft 8 , the shaft is fixed and supports the alternating magnetic system, the two ends of the shaft are fixed on the bracket by means of bearings and bearing seats, and the drive wheel 7 fixed on the shaft is driven by the motor 10 according to the arrow in Figure 1 Rotate in direction A; selection board 3, the selection board is a cylindrical selection board, arranged on the outside of the alternating magnetic system, with a gap between the alternating magnetic system, the axis of the selection board is the same as the alternating magnetic system axis, The selection board is driven by the motor 11 and interacts with the alternating magnetic system to move relatively; the feeding box 6 is arranged on the upper part of the screen 1; the non-magnetic material box 14 is arranged under the selection board Magnetic material box 13, the material box is arranged on the side of the non-magnetic material box; Unloading roller 9, the surface of the unloading roller is processed with tooth grooves to ensure that the surface of the unloading roller has a strong magnetic induction, which is beneficial to remove the magnetic on the surface of the selection board For materials, the unloading roller is placed in the mine discharge area and is driven by the motor 12; the characteristics are as follows: a. There is a screen 1 on the outside of the drum selection plate, which is fixed on the screen bracket 2 and placed in the action area of the alternating magnetic field; b. There is a gap between the drum type selection plate and the alternating magnetic system, and the two interact with each other to move relative to each other.

When the magnetic material 5 is fed to the screen from the feeding box 6, the particles of the magnetic material are subjected to the magnetic force of the alternating magnetic system, and while they are turned along the screen, the particles with suitable particle size are attracted by the magnetic force and the gravity of the material itself. The effect is to pass through the sieve hole and fall onto the surface of the selection board. Particles with a particle size larger than the sieve enter the mixing box 15 . The material under the screen continues to roll magnetically in the direction of arrow B in Figure 1 on the surface of the selection board, constantly destroying the magnetic agglomeration effect, throwing away the mixed non-magnetic material, and falling into the non-magnetic material box 14, and the magnetic particles roll to When the discharge roller is at 9, it is attracted by the induction magnetic force of the discharge roller, and the magnetic material is discharged into the magnetic material box 13 by means of the centrifugal force of the discharge roller.

The alternating magnetic system can also be made of a three-phase AC winding embedded in a grooved iron core, as shown in Figure 2. The alternating magnetic system consists of laminated silicon steel sheets with grooves around them to form an iron core 17, and a three-phase AC winding 16 is embedded in the grooves. When the winding is supplied with three-phase alternating current, a rotating magnetic field is generated around the iron core, and its function is the same as that of the above-mentioned permanent magnet alternating magnetic system.

The alternating magnetic system can also be made into a planar magnetic system 4a, as shown in FIG. 3 . A groove is opened on one side of the iron core 17a, and a three-phase AC winding 16a is embedded in the groove. When the three-phase power supply is turned on, a parallel moving electromagnetic field is generated on one side of the iron core winding, and a plate-type selection plate 3a and a planar screen 1a are arranged above the planar magnetic system, and the screen is fixed on the screen support 2a , placed in the action area of the planar magnetic system. When the magnetic material 5 is fed from the feeding box 6a to the flat screen 1a, part of the mixed non-magnetic material directly falls into the non-magnetic material box 14a, and the magnetic material moves along the plane due to the effect of the parallel moving magnetic field generated by the planar magnetic system. Shaped sieve moves upwards, and meanwhile, the material with suitable particle size passes through the sieve hole and falls on the plate type selection plate 3a, and the coarse material on the flat sieve is collected in the magnetic material box 13a. The fine-grained material on the plate type selection board moves to the magnetic material box 13b according to the direction of arrow B in Fig. 3, while the nonmagnetic material slides into the nonmagnetic material box 14b along the slope of the plate type selection plate due to gravity.

Claims (1)

1. A magnetic screening machine, comprising: - Alternating magnetic system, the alternating magnetic system is fixed on the shaft and placed inside the selection plate, and the magnetic poles of the alternating magnetic system are arranged alternately along the circumferential direction N and S; - Shaft, the shaft is fixed and supports the alternating magnetic system, the two ends of the shaft are fixed on the bracket by means of bearings and bearing seats, and the shaft is driven by the motor; - selection board, the selection board is a cylindrical selection board, which is fixed on the outside of the alternating magnetic system, and the axis of the cylindrical selection board is the same as that of the alternating magnetic system; - a feed box arranged in the upper part of the screen; - non-magnetic material box, the material box is arranged under the drum type selection plate; - a magnetic material box, the material box is arranged on the side of the non-magnetic material box; - discharge roller, the discharge roller is arranged in the ore discharge area; It is characterized by: a. There is a screen on the outside of the cylindrical selection plate, and the screen is placed in the alternating magnetic field action area; b. There is a gap between the drum type selection plate and the alternating magnetic system, and the two interact with each other to move relative to each other.

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