Permanent magnet air gap pulse dry type separation roller and magnetic separator

Abstract

The invention discloses a permanent magnet air gap pulsating dry-type separation roller and a magnetic separator, and belongs to the technical field of ore dry-type separation, the permanent magnet air gap pulsating dry-type separation roller comprises a magnetic conductive layer, and the magnetic conductive layer is composed of a plurality of circumferentially distributed magnetic group strips; the polarities of the outer sides of the magnetic group strips are alternately arranged in the circumferential direction in the form of 'NN, SS, NN, SS...' poles, or 'NNN, SSS, NNN, SSS...' poles; an included angle is formed between the adjacent magnetic group strips with the same polarity, and the included angle is smaller than 60 degrees. According to the structure, the magnetic penetration depth of the magnetic system can be changed, the recovery rate of magnetic minerals can be increased, and the screening of concentrate grade can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dry separation of ores, and is mostly used for dry pre-selection and waste rejection after the coarse and fine crushing of ores. Specifically, it relates to a permanent magnet air-gap pulsating dry separation drum and a magnetic separator. Background Art

[0002] The dry separation belt conveyor for ores after coarse and fine crushing is a widely used ore dressing equipment. The specific working principle is as follows: When the crushed materials are transported to the magnetic drum through the conveyor belt, the non-magnetic substances mixed in the materials are automatically unloaded at the front end of the magnetic drum. However, the materials with a higher iron grade are attracted by the strong magnetic field and continue to move forward along the conveyor belt. After leaving the magnetic field, they automatically fall to another conveying device by inertia, thus realizing the separation of magnetic substances and non-magnetic substances.

[0003] Currently, the polarities of the magnetic group bars distributed circumferentially in the separation drum are mostly arranged alternately as "N, S, N, S...", and the magnetic field intensity does not change much, so it is often less adaptable to the magnetic separation of different magnetic materials.

[0004] Although the public patent CN207056764U discloses the technical feature of the arrangement of "NN, SS, NN, SS..." poles alternately in the magnet device and the magnetic separator, the same-polar and adjacent magnetic group bars are closely attached together, and only an included angle is provided between the non-same-polar and adjacent magnetic group bars. The magnetic penetration depth between the same-polar magnetic resistance bars is insufficient and is not suitable for the screening of concentrate grade.

[0005] In view of the above problems, the present invention designs and manufactures a permanent magnet air-gap pulsating dry separation drum and a magnetic separator to overcome the above defects. Summary of the Invention

[0006] Regarding the problems existing in the prior art, a permanent magnet air-gap pulsating dry separation drum and a magnetic separator provided by the present invention can change the magnetic penetration depth of the magnetic system, improve the recovery rate of magnetic minerals, and can greatly improve the screening of concentrate grade.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: A permanent magnet air-gap pulsating dry separation drum includes a magnetic conductive layer, and the magnetic conductive layer is composed of a plurality of circumferentially distributed magnetic group bars; The outer polarities of the magnetic group bars are arranged alternately as "NN, SS, NN, SS..." or "NNN, SSS, NNN, SSS..." along the circumferential direction; An included angle is provided between adjacent and same-polar magnetic group bars, and the included angle is less than 60°.

[0008] Preferably, the magnetic group bars are rectangular strips.

[0009] Preferably, the magnetic group strip is composed of a plurality of magnetic blocks.

[0010] Preferably, the outside of the magnetic group strip can be encapsulated by a packaging box made of non-magnetic conductive material.

[0011] Preferably, a main shaft is provided at the center of the magnetic conductive layer, and two magnetic yoke discs are provided on the main shaft; A plurality of magnetic group bottom plates are connected to the outer side walls of the two magnetic yoke discs; The magnetic group strip is connected to the magnetic group bottom plate.

[0012] Preferably, the magnetic system included angle of the magnetic conductive layer is greater than 0 degree and less than or equal to 360 degrees.

[0013] Preferably, the magnetic yoke disc includes two semi-circular arc plates, and shaft clamping seats are fixed on the side walls of the two semi-circular arc plates in the same direction at the inner arc position. After the two shaft clamping seats are connected, they can hold the main shaft tightly.

[0014] Preferably, it further includes a cylinder skin, end covers are connected to both ends of the cylinder skin, and the centers of the two end covers are connected to the main shaft through bearings.

[0015] A magnetic separator includes the above-mentioned permanent magnet air-gap pulsating dry sorting drum.

[0016] The beneficial effects of this invention are as follows: 1. In this invention, an included angle is set between adjacent magnetic group strips with the same polarity, combining the conventional structural shape of the magnetic group strip (the rectangular strip can just form an included angle when arranged on the circumference), and no additional processing of the included angle is required.

[0017] 2. Due to the existence of the included angle between magnetic group strips with the same polarity, compared with the existing structure without an included angle between magnetic group strips with the same polarity, the overall outer arc surface area increases. Therefore, the magnetic penetration depth of the magnetic system is increased, and at the same time, the recovery rate of magnetic minerals during ore dressing is improved.

[0018] 3. The gap caused by this included angle will significantly reduce the magnetic field strength on the surface of the cylinder skin corresponding to this area compared with other areas. This will increase the gradient of the magnetic field strength between the included angle areas adjacent to the magnetic group strips with different polarities. When minerals are sorted and pass through the adjacent included angle areas with the same polarity, due to the greatly reduced magnetic adsorption force, the minerals become extremely loose. Combining with the centrifugal force generated by the rotation of the drum during the magnetic separation tumbling process, it is beneficial to the peeling of weakly magnetic minerals or gangue minerals, and finally the concentrate grade will be greatly improved.

[0019] 4. Most of the cylinder skins are made of stainless steel. Due to the influence of magnetic eddy current, heat will be generated inside the cylinder. In the existing structure where there is no angle between the same-polarity magnetic group bars, due to the lack of sufficient heat dissipation space, the heat of the magnetic blocks is not dissipated sufficiently, and it is easy to demagnetize due to heat. The existence of the angular gap between the same-polarity magnetic group bars in the present invention increases the heat dissipation area of the magnetic blocks inside the magnetic group bars, reduces the heat accumulation between the magnetic blocks, and reduces the risk of demagnetization due to heat of the magnetic blocks under long-term high temperature.

[0020] 5. The present invention adjusts the magnetic system included angle in combination with the packaging position of the packaging box, which can meet the requirements of particle size sorting indexes for different materials. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the polarity of the magnetic group bars in the present invention arranged alternately as "NN, SS, NN, SS..." poles; Figure 2 It is a schematic diagram of the partial structure of the present invention; Figure 3 It is a schematic diagram of the polarity of the magnetic group bars arranged alternately as "NN, SS, NN, SS..." poles when the magnetic system included angle of the present invention is at a certain angle; Figure 4 It is a schematic diagram of the partial structure when the magnetic system included angle of the present invention is at a certain angle; Figure 5 It is a schematic diagram of the magnetic blocks fixed on the magnetic group bottom plate of the present invention; Figure 6 It is a schematic diagram of the packaging box of the present invention; Figure 7 It is a magnetic field curve diagram when there is an angle between adjacent and same-polarity magnetic group bars; Figure 8 It is a magnetic field curve diagram when there is no angle between adjacent and same-polarity magnetic group bars.

[0022] In the figure: 1, magnetic group bar; 2, yoke disc; 3, shaft seat; 4, main shaft; 5, magnetic group bottom plate; 6, packaging box; 7, magnetic block. Detailed Embodiment

[0023] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0024] As Figures 1 to 6 shown, a permanent magnet air-gap pulsating dry separation drum includes a magnetic conductive layer, and the magnetic conductive layer is composed of a plurality of circumferentially distributed magnetic group bars 1, and the magnetic group bars 1 are preferably rectangular bars; The outer polarities of the magnetic group bars 1 are arranged alternately as "NN, SS, NN, SS..." poles or "NNN, SSS, NNN, SSS..." poles along the circumferential direction; An angle α is provided between adjacent magnetic group bars 1 with the same polarity, and the angle α is less than 60°. Of course, the previous angle β is still reserved between adjacent magnetic group bars 1 with opposite polarities.

[0025] By combining the conventional structural shape of the magnetic group bar 1 (the rectangular strip can just form an angle when arranged on the circumference), no additional processing of the angle is required.

[0026] Specifically, as shown in Figure 7 、 Figure 8 and Table 1 below, a comparison is made between having an angle α between adjacent magnetic group bars 1 with the same polarity and not having an angle between adjacent magnetic group bars 1 with the same polarity:

[0027] Table 1 is the comparison of the magnetic field values at the 0 position

[0028] Due to the existence of the angle α between the magnetic group bars 1 with the same polarity, compared with the existing structure without an angle between the magnetic group bars 1 with the same polarity, the overall outer arc surface area increases. As can be seen from the above table, when the distance from the surface of the magnetic system is farther, specifically, the simulation data at the 90 - 100 mm position shows that when there is an angle "α", the magnetic field data is significantly higher, indicating that this arrangement is beneficial to improving the magnetic penetration depth of the magnetic system and is conducive to controlling the tailing index during the separation process while improving the concentrate index.

[0029] In addition, the gap caused by the angle α will significantly reduce the magnetic field intensity on the surface of the cylinder skin corresponding to this area compared with other areas. Specifically, the magnetic field in this area is significantly reduced compared with when there is no angle, which will increase the gradient of the magnetic field intensity in the area of the angle β between the magnetic group bars 1 with opposite polarities (it can be seen from Figure 7 、 Figure 8 that the magnetic field value in the area of the angle β is higher than that in the area of the angle α near the surface of the magnetic system). When the minerals are separated and pass through the area of the adjacent angle α between the magnetic group bars with the same polarity, due to the greatly reduced magnetic adsorption force, the minerals become extremely loose. Combining with the centrifugal force of the roller rotation during the magnetic separation tumbling process, it is beneficial to the separation of weakly magnetic minerals or gangue minerals, and finally will greatly improve the concentrate grade.

[0030] In addition, most of the cylinder skins are made of stainless steel. Due to the influence of magnetic eddy currents, heat will be generated inside the cylinder. In the existing structure without an angle between the magnetic group bars 1 with the same polarity, due to the lack of sufficient heat dissipation space, the heat of the magnetic block 7 cannot be dissipated sufficiently, and it is easy to demagnetize thermally. The existence of the angle gap between the magnetic group bars 1 with the same polarity in the present invention increases the heat dissipation area of the magnetic block 7 inside the magnetic group bar 1, reduces the heat accumulation between the magnetic blocks 7, and reduces the risk of thermal demagnetization of the magnetic block 7 under long-term high temperature.

[0031] The magnetic group strip 1 of the present invention is composed of a number of magnetic blocks 7. The outside of the magnetic group strip 1 can be encapsulated by an encapsulation box 6 made of non-magnetic conductive material. The magnetic system included angle is adjusted by combining the encapsulation position of the encapsulation box 6. Specifically, the magnetic system included angle of the magnetic conductive layer ranges from greater than 0 degree to less than or equal to 360 degrees, which can meet the requirements of particle size separation indexes of different materials.

[0032] A main shaft 4 is provided at the center of the magnetic conductive layer of the present invention. Two magnetic yoke discs 2 are provided on the main shaft 4. A number of magnetic group base plates 5 are connected to the outer side walls of the two magnetic yoke discs 2. The magnetic group strip 1 is connected to the magnetic group base plates 5.

[0033] The magnetic yoke disc 2 specifically includes two semi-circular arc plates. Shaft clamping seats 3 are fixed on the side walls of the two semi-circular arc plates at the same direction of the inner arc position. After the two shaft clamping seats 3 are connected, they can hold the main shaft 4 tightly.

[0034] It further includes a cylinder skin (not shown in the figure). End covers are connected to both ends of the cylinder skin. The centers of the two end covers are connected to the main shaft 4 through bearings.

[0035] The present invention also provides a magnetic separator, which includes the above-mentioned permanent magnet air-gap pulsating dry separation drum.

[0036] It should be understood that the use of these embodiments is only for explaining the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or variations to the present invention, and all these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A permanent magnet air-gap pulsation dry separation drum, characterized in that, It includes a magnetic conductive layer which is composed of several magnetic group bars (1) distributed in a circumferential manner; The outer polarities of the magnetic group bars (1) are arranged alternately in the circumferential direction as "NN, SS, NN, SS... " poles, or, "NNN, SSS, NNN, SSS... " poles; There is an included angle between adjacent and like-polar magnetic group bars (1), and the included angle is less than 60°.

2. The permanent magnet air-gap pulsating dry separation drum according to claim 1, characterized in that, The magnetic group bars (1) are rectangular strips.

3. A permanent magnet air-gap pulsating dry separation drum according to claim 1, characterized in that, The magnetic group bars (1) are composed of several magnetic blocks (7).

4. A permanent magnet air-gap pulsating dry sorting drum according to claim 1, characterized in that, The outside of the magnetic group bars (1) can be encapsulated by an encapsulation box (6) made of non-magnetic conductive material.

5. A permanent magnet air-gap pulsating dry separation drum according to claim 1, wherein, A main shaft (4) is provided at the center of the magnetic conductive layer, and two magnetic yoke discs (2) are provided on the main shaft (4); A number of magnetic group bottom plates (5) are connected to the outer side walls of the two magnetic yoke discs (2); The magnetic group bars (1) are connected to the magnetic group bottom plates (5).

6. The permanent magnet air-gap pulsating dry sorting drum according to claim 1, characterized in that, The magnetic system included angle of the magnetic conductive layer is greater than 0 degree and less than or equal to 360 degrees.

7. A permanent magnet air-gap pulsating dry separation drum according to claim 5, characterized in that, The magnetic yoke disc (2) includes two semi-circular arc plates, and shaft clamping seats (3) are fixed on the side walls of the two semi-circular arc plates at the same direction of the inner arc position. After the two shaft clamping seats (3) are connected, they can tightly hold the main shaft (4).

8. A permanent magnet air-gap pulsating dry separation drum according to claim 5, characterized in that, It further includes a cylinder skin, end covers are connected to both ends of the cylinder skin, and the centers of the two end covers are connected to the main shaft (4) through bearings.

9. A magnetic separator, characterized in that, It includes the permanent magnet air-gap pulsating dry sorting drum according to any one of claims 1 to 8.

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