Permanent-magnetic air-gap pulsating dry-type sorting drum and magnetic separator

Abstract

The application discloses a permanent-magnetic air-gap pulsation dry-type sorting drum and a magnetic separator, and belongs to the technical field of ore dry-type sorting, which comprises a magnetic guide layer, wherein the magnetic guide layer is composed of a plurality of circumferentially distributed magnetic group strips; the polarity of the outer side of the magnetic group strips is arranged in an alternating manner along the circumferential direction as "NN, SS, NN, SS... " or "NNN, SSS, NNN, SSS... "; an included angle is arranged between adjacent magnetic group strips with the same polarity, and the included angle is less than 60 DEG. The structure can change the magnetic permeability depth of the magnetic system, can improve the recovery rate of the magnetic mineral, and can greatly improve the screening of the concentrate grade.

Description

Technical Field

[0001] The present invention relates to the technical field of dry ore sorting, and is mostly used for dry pre-selection and discarding of ore after coarse and fine crushing. In particular, it relates to a permanent magnetic air gap pulsating dry sorting drum and a magnetic separator. Background Art

[0002] The dry sorting belt conveyor for ore coarse and fine crushing is a widely used mineral processing equipment. The specific working principle is:

[0003] When the crushed material is transported to the magnetic drum via the conveyor belt, the non-magnetic substances mixed in the material are automatically unloaded at the front end of the magnetic drum, while the material with a higher iron content is attracted by the strong magnetic field and continues to move forward with the conveyor belt. After being separated from the magnetic field, it automatically falls to another conveying device by inertia, thereby realizing the separation of magnetic and non-magnetic materials.

[0004] Currently, the polarity of the magnetic strips distributed circumferentially in the sorting drum is mostly "N, S, N, S..." arranged alternately, and the magnetic field strength does not change much. It often has poor adaptability to the magnetic separation of different magnetic materials.

[0005] Although the patent CN207056764U discloses the technical feature of alternating pole arrangement of "NN, SS, NN, SS...", the adjacent magnetic strips of the same polarity are tightly attached to each other, and only the adjacent magnetic strips of non-same polarity are set with an angle. The magnetic penetration depth between the magnetic resistance strips of the same polarity is insufficient, making it unsuitable for screening of concentrate grade.

[0006] In view of the above problems, the present invention designs and manufactures a permanent magnetic air gap pulsating dry sorting drum and a magnetic separator to overcome the above defects. Summary of the Invention

[0007] In order to solve the problems existing in the prior art, the present invention provides a permanent magnetic air gap pulsating dry sorting drum and magnetic separator, which can change the magnetic penetration depth of the magnetic system, improve the recovery rate of magnetic minerals, and greatly improve the screening of concentrate grade.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows: a permanent magnetic air gap pulsating dry sorting drum, comprising a magnetic conductive layer, wherein the magnetic conductive layer is composed of a plurality of circumferentially distributed magnetic strips;

[0009] The outer polarities of the magnetic strips are arranged alternately along the circumferential direction as "NN, SS, NN, SS..." or "NNN, SSS, NNN, SSS...";

[0010] An included angle is set between adjacent magnetic strips of the same polarity, and the included angle is less than 60°.

[0011] Preferably, the magnetic strips are rectangular strips.

[0012] Preferably, the magnetic strip is composed of several magnetic blocks.

[0013] Preferably, the outside of the magnetic strips can be encapsulated by an encapsulation box made of non-magnetic material.

[0014] Preferably, a main shaft is provided at the center of the magnetic conductive layer, and two magnetic yoke disks are provided on the main shaft;

[0015] A plurality of magnetic group bottom plates are connected to the outer side walls of the two magnetic yoke disks;

[0016] The magnetic group strip is connected to the magnetic group bottom plate.

[0017] Preferably, the magnetic system wrap angle of the magnetic conductive layer is greater than 0 degree and less than or equal to 360 degrees.

[0018] Preferably, the yoke disk includes two semicircular arc plates, and shaft holders are fixed on the side walls of the two semicircular arc plates in the same direction at the inner arc position. The two shaft holders can hold the main shaft tightly after being connected.

[0019] Preferably, it further comprises a tube skin, both ends of the tube skin are connected with end covers, and the centers of the two end covers are connected to the main shaft through bearings.

[0020] A magnetic separator comprises the above-mentioned permanent magnetic air gap pulsating dry-type sorting drum.

[0021] The benefits of this invention are:

[0022] 1. The present invention sets an angle between adjacent magnetic strips of the same polarity, combining the conventional structural shape of the magnetic strips (rectangular strips arranged on the circumference can just form an angle), and does not require additional processing of the angle.

[0023] 2. Due to the existence of the angle between the magnetic strips of the same polarity, the overall outer arc surface area is increased compared to the existing structure with no angle between the magnetic strips of the same polarity, thereby increasing the magnetic penetration depth of the magnetic system and improving the recovery rate of magnetic minerals during mineral processing.

[0024] 3. The gaps caused by the angle will significantly reduce the magnetic field intensity on the drum surface in this area compared to other areas, which will increase the gradient of the magnetic field intensity in the angle area between adjacent magnetic strips of non-same polarity. When the minerals pass through the adjacent same polarity angle area during separation, the magnetic field adsorption force is greatly reduced, making the minerals abnormally loose. In the process of magnetic separation tumbling, combined with the centrifugal force of the drum rotation, it is conducive to the stripping of weakly magnetic minerals or gangue minerals, and ultimately will greatly improve the concentrate grade.

[0025] 4. The cylinder skin is mostly made of stainless steel. Due to the influence of magnetic eddy currents, heat will be generated inside the cylinder. In the existing structure where there is no angle between the magnetic strips of the same polarity, there is no sufficient heat dissipation space, and the heat dissipation of the magnetic blocks is insufficient, which is prone to thermal demagnetization. The existence of the angle gap between the magnetic strips of the same polarity in the present invention increases the heat dissipation area of ​​the magnetic blocks inside the magnetic strips, reduces the heat accumulation between the magnetic blocks, and reduces the risk of thermal demagnetization of the magnetic blocks under long-term high temperature.

[0026] 5. The present invention adjusts the magnetic system wrap angle in combination with the packaging position of the packaging box to meet the particle size sorting index requirements of different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the magnetic strips of the present invention with polarity of "NN, SS, NN, SS..." arranged alternately;

[0028] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the polarity of the magnetic strips being arranged alternately as "NN, SS, NN, SS..." when the magnetic system wrap angle of the present invention is a certain angle;

[0030] Figure 4 It is a schematic diagram of the local structure of the magnetic system of the present invention with a certain angle;

[0031] Figure 5 A schematic diagram of the magnetic block of the present invention being fixed to the bottom plate of the magnetic assembly;

[0032] Figure 6 is a schematic diagram of a packaging box of the present invention;

[0033] Figure 7 The magnetic field curve diagram when adjacent magnetic strips with the same polarity have an angle;

[0034] Figure 8 This is the magnetic field curve when there is no angle between adjacent magnetic strips of the same polarity.

[0035] In the figure: 1. Magnetic strip; 2. Yoke disk; 3. Shaft holder; 4. Spindle; 5. Magnetic base plate; 6. Packaging box; 7. Magnetic block. DETAILED DESCRIPTION

[0036] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0037] like Figures 1 to 6 As shown, a permanent magnetic air gap pulsating dry sorting drum includes a magnetic conductive layer, which is composed of a plurality of circumferentially distributed magnetic strips 1, and the magnetic strips 1 are preferably rectangular strips;

[0038] The outer polarities of the magnetic strips 1 are arranged alternately along the circumferential direction as "NN, SS, NN, SS..." or "NNN, SSS, NNN, SSS...";

[0039] An angle a is set between adjacent magnetic strips 1 of the same polarity, and the angle a is less than 60°. Of course, the angle b is also retained between adjacent magnetic strips 1 of non-polarity.

[0040] By combining the conventional structural shape of the magnetic strip 1 (rectangular strips arranged on the circumference can just form an angle), no additional processing of the angle is required.

[0041] Specific as Figure 7 、 Figure 8 As shown in Table 1 below, a comparison is made between the adjacent magnetic strips 1 of the same polarity with an angle a set therebetween and the adjacent magnetic strips 1 of the same polarity with no angle set therebetween:

[0042] Table 1 is the comparison of magnetic field values ​​at position 0

[0043]

[0044] Due to the existence of the angle a between the magnetic strips 1 of the same polarity, the overall outer arc surface area is increased compared with the existing structure with no angle between the magnetic strips 1 of the same polarity. Combined with the above table, it can be seen that when the distance from the magnetic system surface is farther, the simulation data at the specific position of 90-100mm shows that when there is an angle "a", the magnetic field data is significantly higher, indicating that this arrangement is conducive to improving the magnetic penetration depth of the magnetic system, while improving the concentrate index, it is beneficial to control the tailings index in the sorting process.

[0045] In addition, the gap caused by the angle a will significantly reduce the magnetic field intensity of the corresponding area on the surface of the tube skin compared to other areas. Specifically, the magnetic field in this area is significantly reduced compared to when there is no angle. This will increase the gradient of the magnetic field intensity in the area with the angle b between the adjacent magnetic strips 1 with non-same polarity (given by Figure 7 、 Figure 8 It can be seen that the magnetic field value in the angle b area is higher than that in the angle a area near the magnetic system surface). When the minerals pass through the adjacent angle a area with the same polarity during separation, the magnetic field adsorption force is greatly reduced, making the minerals become abnormally loose. During the magnetic separation tumbling process, combined with the centrifugal force of the drum rotation, it is conducive to the stripping of weakly magnetic minerals or gangue minerals, which will ultimately greatly improve the concentrate grade.

[0046] In addition, the cylinder skin is mostly made of stainless steel. Due to the influence of magnetic eddy currents, heat will be generated in the cylinder. The existing structure has no angle between the magnetic strips 1 of the same polarity. Due to the lack of sufficient heat dissipation space, the heat dissipation of the magnetic block 7 is insufficient and it is easy to demagnetize by heat. The existence of the angle gap between the magnetic strips 1 of the same polarity of the present invention increases the heat dissipation area of ​​the magnetic block 7 inside the magnetic strip 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.

[0047] The magnetic strip 1 of the present invention is composed of a plurality of magnetic blocks 7. The outside of the magnetic strip 1 can be encapsulated by an encapsulation box 6 made of non-magnetic material. The magnetic system wrap angle is adjusted by combining the encapsulation position of the encapsulation box 6. Specifically, the magnetic system wrap angle range of the magnetic conductive layer is greater than 0 degrees and less than or equal to 360 degrees, which can meet the particle size sorting index requirements of different materials.

[0048] The center of the magnetic conductive layer of the present invention is provided with a main shaft 4, on which two magnetic yoke disks 2 are provided. The outer walls of the two magnetic yoke disks 2 are connected to a plurality of magnetic group bottom plates 5, and the magnetic group strips 1 are connected to the magnetic group bottom plates 5.

[0049] The yoke disk 2 specifically includes two semicircular arc plates, and the shaft clamping seats 3 are fixed on the side walls of the two semicircular arc plates in the same direction at the inner arc position. The two shaft clamping seats 3 can hold the main shaft 4 tightly after being connected.

[0050] It also includes a cylinder skin (not shown in the figure), both ends of which are connected to end covers, and the centers of the two end covers are connected to the main shaft 4 through bearings.

[0051] The present invention also provides a magnetic separator, which includes the above-mentioned permanent magnetic air gap pulsating dry separation drum.

[0052] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the scope of protection 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 may make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the scope of protection defined by the claims appended hereto.

Claims

1. A permanent magnetic air gap pulsating dry sorting drum, characterized in that: It comprises a magnetic conductive layer, wherein the magnetic conductive layer is composed of a plurality of circumferentially distributed magnetic strips (1); The outer polarities of the magnetic strips (1) are arranged alternately along the circumferential direction in the order of "NN, SS, NN, SS" or "NNN, SSS, NNN, SSS"; An angle capable of increasing the magnetic penetration depth of the magnetic system is provided between adjacent magnetic strips (1) of the same polarity, and the angle is less than 60°.

2. The permanent magnetic air gap pulsating dry sorting drum according to claim 1, characterized in that: The magnetic strip (1) is in the shape of a rectangular strip.

3. The permanent magnetic air gap pulsating dry sorting drum according to claim 1, characterized in that: The magnetic strip (1) is composed of a plurality of magnetic blocks (7).

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

5. The permanent magnetic air gap pulsating dry sorting drum according to claim 1, characterized in that: A main shaft (4) is provided at the center of the magnetic conductive layer, and two magnetic yoke disks (2) are provided on the main shaft (4); A plurality of magnetic assembly bottom plates (5) are connected to the outer side walls of the two magnetic yoke disks (2); The magnetic group strip (1) is connected to the magnetic group bottom plate (5).

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

7. The permanent magnetic air gap pulsating dry sorting drum according to claim 5, characterized in that: The yoke disc (2) comprises two semicircular arc plates, and a shaft clamping seat (3) is fixed on the side walls of the two semicircular arc plates in the same direction at the inner arc position. The two shaft clamping seats (3) can hold the main shaft (4) tightly after being connected.

8. The permanent magnetic air gap pulsating dry sorting drum according to claim 5, characterized in that: It also includes a tube skin, with end covers connected to both ends of the tube 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 comprises the permanent magnetic air gap pulsating dry sorting drum as described in any one of claims 1 to 8.

Images