High magnetic field constant temperature vertical ring magnetic separator

Abstract

This invention relates to the field of mineral sorting equipment technology, specifically a high-magnetic-field constant-temperature vertical ring magnetic separator, which includes a frame, an upper yoke, an excitation winding, and a lower yoke. A cooling box is fitted around the lower yoke, and the excitation winding is completely immersed in the cooling medium within the cooling box. The excitation winding is composed of multiple coils stacked axially, connected in series, parallel, or a combination of series and parallel. The coils are secured together as a whole by multiple sets of circumferentially distributed binding components. Each coil includes multiple sets of nested coil packages, with each coil package within the same set connected in series. Spacer components are provided between adjacent coil packages. Silicon steel plates and other spacer components provide a fixed gap between adjacent coil packages, forming a flow channel for the cooling medium. The cooling medium can flow through the gap, directly carrying away the heat generated on the surface of the coil packages and preventing heat accumulation inside the coil packages.

Description

Technical Field

[0001] This invention relates to the field of mineral sorting equipment technology, specifically a high magnetic field constant temperature vertical ring magnetic separator. Background Technology

[0002] The vertical ring high gradient magnetic separator is one of the core equipment for wet separation of weakly magnetic ores and purification of non-metallic ores. Its working principle is as follows: a strong magnetic field is generated by the excitation winding, which forms a closed magnetic circuit through the upper and lower iron yokes. Magnetic medium is filled in the rotating ring between the magnetic yoke and the winding. The lower part of the rotating ring is immersed in the slurry. The magnetized magnetic medium adsorbs magnetic mineral particles. After rotating to the upper part with the rotating ring, the mineral particles are washed down to the collection box by high-pressure flushing water, thus completing the separation operation.

[0003] In actual industrial production, vertical ring magnetic separators typically employ high magnetic field designs to improve sorting efficiency and accuracy. Currently, the magnetic field strength of high-gradient vertical ring magnetic separators is mostly below 18,000 GS. If it is further increased to 20,000 GS or higher, the current heating effect will cause heat to accumulate rapidly inside the windings, which can easily lead to coil burnout.

[0004] To avoid the aforementioned problems, existing vertical ring magnetic separators often employ a periodic shutdown and cooling method, restarting the equipment only after the excitation winding temperature has dropped to a safe range. However, this intermittent operation mode disrupts the continuous production process, significantly reduces production efficiency, and makes it difficult to meet the requirements of industrial production for continuity and stability. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes a high magnetic field constant temperature vertical ring magnetic separator, which aims to achieve efficient constant temperature heat dissipation throughout the excitation winding, avoid frequent shutdowns due to overheating, and ensure continuous and stable operation under high magnetic field conditions.

[0006] To address the aforementioned technical problems, a high-magnetic-field constant-temperature vertical ring magnetic separator is provided, comprising a frame, an upper yoke, an excitation winding, and a lower yoke. A rotating ring is positioned at the top of the frame, with the upper and lower yokes respectively located on the inner and outer sides of the rotating ring. A cooling box is fitted around the lower yoke, and the excitation winding is completely immersed in the cooling medium within the cooling box. A medium inlet is located on one side of the bottom of the cooling box, and a medium outlet is located on one side of the top of the cooling box. The medium outlet and the medium inlet are connected to a circulating cooling system. The excitation winding is composed of multiple coils stacked sequentially along the axial direction. The multiple coils are connected in series, parallel, or a combination of series and parallel connections, and are secured together as a whole by multiple sets of circumferentially distributed binding components. Each coil includes multiple sets of nested coil bundles, with each coil bundle within the same set connected in series. A silicon steel spacer is provided between adjacent coil bundles.

[0007] Preferably, the binding assembly includes a pressure plate and a base plate. The pressure plate is attached to the upper end face of the uppermost wire disc, and the base plate is attached to the lower end face of the lowermost wire disc. The base plate is fixedly connected to the pressure plate by two sets of double-headed studs.

[0008] Preferably, the spacer assembly is a split design, comprising multiple sets of silicon steel plates corresponding one-to-one with the binding assembly. The silicon steel plates are disposed between each adjacent coil bundle, and the two ends of the silicon steel plates are respectively inserted into the pressure plate and the base plate.

[0009] Preferably, the silicon steel plate at the bend of the coil is arc-shaped.

[0010] Preferably, the spacer assembly is an integral design, including an annular base, with multiple sets of spaced vertical plates integrally arranged on the upper surface of the base along the length and width directions, and an arc-shaped plate integrally arranged on the upper surface of the base at the bend. Both the vertical plates and the arc-shaped plate are inserted into the pressure plate, and the base is inserted into the bottom plate.

[0011] Preferably, the lower end face of the base plate is provided with multiple sets of flow channels.

[0012] Preferably, an insulating spacer is provided between adjacent coils.

[0013] Preferably, the insulating spacer includes a first spacer and a second spacer; the first spacer is provided in multiple sets, and the multiple sets of the first spacer are arranged at both ends in the length direction of the coil; the second spacer is provided in multiple sets, and the multiple sets of the second spacer are arranged on both sides in the width direction of the coil.

[0014] Preferably, the multiple sets of the second partition bars are arranged obliquely, and the angle α between the second partition bar and the mainstream direction of the cooling medium is 45°-60°.

[0015] After adopting the above technical solution, the beneficial effects of the present invention are:

[0016] The silicon steel plate and other spacer components provide a fixed gap between adjacent coils. This gap forms a flow channel for the cooling medium, which can flow in the gap and directly carry away the heat generated on the surface of the coil, thus preventing heat accumulation inside the coil. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of a high-magnetic-field constant-temperature vertical ring magnetic separator.

[0019] Figure 2 This is a schematic diagram of the cooling box structure;

[0020] Figure 3 This is a schematic diagram of the excitation winding structure;

[0021] Figure 4 This is a structural diagram of the bundling assembly;

[0022] Figure 5 This is a schematic diagram of the excitation winding.

[0023] Figure 6 This is a schematic diagram of the spacer component.

[0024] Figure 7 This is a schematic diagram showing the flow direction of the cooling medium.

[0025] Reference numerals: 1-Frame, 2-Medium inlet, 3-Cooling box, 4-Feed hopper, 5-Rotating ring, 6-Flushing pipe, 7-Receiving box, 8-Upper yoke, 9-Oil conservator, 10-Medium outlet, 11-Excitation winding, 12-Lower yoke, 13-Binding assembly, 14-Wire disc, 15-Coil coil, 16-Pressure plate, 17-Double-ended stud, 18-Base plate, 19-Flow channel, 20-Silicon steel plate, 21-First latch, 22-Slot, 23-Base, 24-Vertical plate, 25-Arc plate, 26-Second latch, 27-First spacer, 28-Second spacer. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Those skilled in the art will recognize that the invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of it.

[0027] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the invention. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] like Figure 1As shown, the high magnetic field constant temperature vertical ring magnetic separator includes a frame 1, a feed hopper 4, a flushing pipe 6, a receiving box 7, an upper yoke 8, an excitation winding 11, and a lower yoke 12.

[0029] The rotating ring 5 is mounted on the frame 1 and is connected to the drive mechanism mounted on the frame 1. The drive mechanism drives the rotating ring 5 to rotate, realizing continuous sorting operation. The upper yoke 8 and the lower yoke 12 are respectively located on the inner and outer sides of the rotating ring 5, that is, the upper yoke 8 is located inside the rotating ring 5, and the lower yoke 12 is partially covered by the outside of the rotating ring 5.

[0030] The feed hopper 4 is positioned above the upper yoke 8. The slurry is fed into the high magnetic field constant temperature vertical ring magnetic separator through the feed hopper 4. Under the action of the strong magnetic field generated by the excitation winding 11, the magnetic medium on the rotating ring 5 is magnetized, and the magnetic particles in the slurry are adsorbed onto the surface of the magnetic medium, thus completing the capture of magnetic minerals.

[0031] The flushing pipe 6 is installed above the rotating ring 5, and the receiving box 7 is located inside the rotating ring 5 and above the upper yoke 8. As the rotating ring 5 continues to rotate, the adsorbed magnetic particles are carried to the top non-magnetic field area. The high-pressure flushing water sprayed from the flushing pipe 6 washes the magnetic particles off the surface of the magnetic medium and causes them to fall into the receiving box 7, thus completing the collection of magnetic minerals.

[0032] like Figure 1 and Figure 2 As shown, to solve the heat dissipation problem of the excitation winding 11, a cooling box 3 is fitted outside the lower yoke 12, and the excitation winding 11 is completely immersed in the cooling medium inside the cooling box 3. The top of the cooling box 3 is provided with a communicating oil conservator 9, which serves as a cooling medium replenishment interface or a thermal expansion buffer container for the cooling medium.

[0033] A medium inlet 2 is provided on one side of the bottom of the cooling box 3, and a medium outlet 10 is provided on one side of the top of the cooling box 3. The medium outlet 10 and the medium inlet 2 are connected to the circulating cooling system. The cooling medium enters the bottom of the cooling box 3 from the medium inlet 2, flows from bottom to top through the excitation winding 11, absorbs the heat generated by the winding, and then flows out from the medium outlet 10. It enters the external circulating cooling system for heat dissipation and is then recycled, thereby achieving continuous constant temperature cooling of the excitation winding 11.

[0034] like Figure 3 As shown, the excitation winding 11 is formed by stacking multiple coils 14 sequentially along the axial direction. Depending on the excitation conditions, the coils 14 can be connected in series, in parallel, or in a mixed series-parallel configuration to flexibly adjust the total winding inductance and excitation current distribution, adapting to different magnetic field strengths and power supply voltage conditions.

[0035] When connected in series, multiple coils 14 are connected end to end in sequence, and the current flows through each coil 14 in sequence, forming a single current path, which is suitable for high magnetic field, small current and high voltage power supply.

[0036] When connected in parallel, the first ends of the wire discs 14 are connected to the positive terminal of the power supply, and the last ends are connected to the negative terminal of the power supply. Each wire disc 14 forms an independent parallel branch, which is suitable for low voltage and high current power supply scenarios.

[0037] When using a series-parallel hybrid connection, first connect several wire discs 14 in series or in parallel to form a group, and then connect multiple groups of series or parallel units in parallel or series with each other to form a series-parallel hybrid structure that is first connected in series and then in parallel or first in parallel and then in series, which is suitable for comprehensive power supply scenarios with high magnetic field, medium voltage, and medium current.

[0038] To prevent the coils 14 from loosening and deforming, multiple sets of binding components 13 are arranged circumferentially along the annular winding direction of the excitation winding 11. Through the coordinated fastening effect of the multiple sets of binding components 13, all the coils 14 are firmly locked into a whole, effectively resisting the influence of electromagnetic vibration and equipment operation impact on the winding structure during excitation.

[0039] like Figure 4 As shown, the bundling assembly 13 includes a pressure plate 16 and a base plate 18. The pressure plate 16 is attached to the upper end face of the uppermost coil 14, and the base plate 18 is attached to the lower end face of the lowermost coil 14. The base plate 18 is connected to the pressure plate 16 by two double-ended studs 17. By tightening the nuts on the double-ended studs 17, axial compression of the entire excitation winding 11 is achieved.

[0040] The excitation winding 11 is completely immersed in the cooling medium within the cooling chamber 3. If the lower end surface of the base plate 18 is a flat surface, the cooling medium will form a dead zone due to the obstruction of the base plate 18. Therefore, multiple sets of flow channels 19 are provided on the lower end surface of the base plate 18 to optimize the flow distribution of the cooling medium, ensuring that the entire bottom area of ​​the excitation winding 11 can receive effective cooling medium flushing, eliminating cooling dead zones, and improving cooling uniformity.

[0041] like Figure 7 As shown, insulating strips are provided between adjacent coils 14. These insulating strips provide a fixed interlayer gap between adjacent coils 14, ensuring that the cooling medium can completely envelop the coils 14, carrying away the heat generated during operation and further enhancing the uniform heat transfer effect. This, combined with the circulating cooling system, helps maintain a constant winding temperature. The insulating strips also effectively isolate adjacent coils 14, preventing electrical breakdown due to contact or excessive distance, thus ensuring safe winding operation.

[0042] The insulating spacers include multiple sets of first spacers 27 and second spacers 28. The first spacers 27 are arranged at both ends along the length of the coil 14 and mainly serve a supporting function. The second spacers 28 are arranged at an angle α of 45°-60° with the mainstream direction of the cooling medium and are arranged on both sides along the width of the coil 14. In addition to providing support and positioning, they can also optimize the flow of the cooling medium.

[0043] After the cooling medium comes into contact with the second spacer 28, a local turbulent region is formed between adjacent second spacers 28. This turbulent flow thins the thermal boundary layer on the surface of the coil 14, enabling rapid convection transfer of heat and increasing the heat exchange rate between the cooling medium and the surface of the coil 14.

[0044] The coil 14 includes multiple sets of interlocking coil coils 15. The coil coils 15 within the same set of coil 14 are connected in series, so that the current flows through each coil coil 15 in sequence, effectively superimposing the number of coil turns, increasing the magnetomotive force under the same excitation current, and thus enhancing the magnetic field strength of the excitation winding 11.

[0045] A spacer assembly made of silicon steel is provided between adjacent coil coils 15, and the adjacent coil coils 15 corresponding to each coil coil 14 share the same set of spacer assemblies to form interlayer cooling channels and optimize magnetic field distribution.

[0046] The spacer assembly can be either a split structure or an integrated structure. For large-size excitation windings 11, a split structure can be used, while for small-size excitation windings 11, an integrated structure can be used.

[0047] The silicon steel spacer has sufficient mechanical strength and can be used as a structural spacer to fill the gap in the coil package 15. It supports and positions the coil package 15, prevents the coil package 15 from shifting or deforming during vibration and operation, ensures that the gap size of the coil package 15 is constant, and thus maintains the stability of the magnetic circuit structure and avoids the magnetic field distribution from being disordered due to the displacement of the coil package 15.

[0048] The spacer components are made of silicon steel, which has a high silicon content and a resistivity much higher than ordinary steel, significantly suppressing eddy current losses generated during excitation winding operation. Simultaneously, its hysteresis loop is narrow, resulting in extremely low hysteresis losses. This reduction in both types of losses directly reduces heat generation in the yoke structure, preventing coil coil 15 from aging due to high temperatures, and also reduces reactive power losses, making the excitation system more energy-efficient and more stable in operation.

[0049] Silicon steel possesses extremely high magnetic permeability and stability, making it resistant to demagnetization and magnetic property decay even under long-term operation in constant / alternating magnetic fields. This ensures that the magnetic field strength and consistency of the magnetic separator do not decrease during long-term operation, and that the separation accuracy and effect do not deteriorate over time. Furthermore, silicon steel has a low magnetostriction coefficient, resulting in minimal expansion and contraction deformation when the magnetic field excitation and flux change. This reduces magnetic circuit vibration, lowers electromagnetic noise during equipment operation, and improves the quietness and structural stability of the magnetic separator.

[0050] like Figure 4 and Figure 5 As shown, the split-type spacer assembly includes multiple sets of silicon steel plates 20 corresponding one-to-one with the binding assembly 13. Each set of silicon steel plates 20 is independently arranged between each adjacent coil bundle 15. The silicon steel plates 20 at the bends of the coil bundle 15 are arc-shaped to cooperate with the coil bundle 15 and avoid sharp contact points.

[0051] Both ends of the silicon steel plate 20 are provided with a first latch 21, and both the pressure plate 16 and the base plate 18 are provided with slots 22 that are adapted to the first latch 21. The first latch 21 at both ends of the silicon steel plate 20 are respectively inserted into the slots 22 of the corresponding pressure plate 16 and base plate 18.

[0052] like Figure 6 As shown, the integrated spacer assembly includes an annular base 23. Multiple sets of spaced vertical plates 24 are arranged on the upper surface of the base 23 along its length and width directions. An arc-shaped plate 25 is provided on the upper surface of the base 23 at its bends. Both the pressure plate 16 and the base plate 18 have slots 22. Second latches 26, which are adapted to the slots 22, are provided on the top of the vertical plates 24, the top of the arc-shaped plates 25, and the bottom of the base 23.

[0053] The thickness of the silicon steel plate 20 and its spacer components ensures a fixed gap between adjacent coil coils 15, allowing the cooling medium to flow within this gap for interlayer cooling. The presence of gaps increases the magnetic reluctance of the coil coils 14 and the entire excitation winding 11, leading to a decrease in magnetic flux and a weakening of the magnetic field strength. However, by using silicon steel spacers to partially fill the gaps between the coil coils 15, the total magnetic reluctance of the magnetic circuit is significantly reduced. This allows the magnetic flux to pass more smoothly through the area between the coil coils 15, resulting in a substantial increase in magnetic flux under the same magnetomotive force. Consequently, the magnetic induction intensity is significantly enhanced, ensuring that the excitation winding 11 can stably output a high magnetic field, meeting the requirements for high magnetic field sorting.

[0054] The spacer assembly provides a low-resistance path for magnetic flux, effectively confining the magnetic lines of force generated by the coil 15 within the working area of ​​the excitation winding 11. It guides the magnetic lines of force along the closed magnetic circuit formed by the pre-set upper yoke 8 and lower yoke 12, preventing them from diverging into the gap area of ​​the coil 15 and reducing leakage flux loss. This reduction in leakage flux concentrates more magnetic field energy in the sorting area, improving the effective utilization rate of the main magnetic field. This not only enhances the magnetization effect of the magnetic medium but also reduces the wasteful consumption of magnetic field energy, improving the energy utilization efficiency of the excitation winding 11 and indirectly reducing energy consumption.

[0055] The high permeability of silicon steel allows magnetic lines of force to be evenly distributed in the spacer assembly, thereby guiding the magnetic field distribution of the entire coil 14 and even the excitation winding 11 to be more uniform. This avoids excessively high or low local magnetic field strength caused by air in the gap of the coil 15, prevents the occurrence of local magnetic saturation, ensures the consistency of the magnetic field in all parts of the rotating ring, and improves the stability of magnetic separation accuracy and sorting effect.

[0056] The embodiments described above are not exhaustive and do not limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A high magnetic field constant temperature vertical ring magnetic separator, comprising a rack (1), an upper yoke (8), an excitation winding (11) and a lower yoke (12), the top of the rack (1) is provided with a rotating ring (5), and the upper yoke (8) and the lower yoke (12) are arranged on the inner and outer sides of the rotating ring (5) respectively; characterized in that: The lower yoke (12) is fitted with a cooling box (3), and the excitation winding (11) is completely immersed in the cooling medium inside the cooling box (3). A medium inlet (2) is provided on one side of the bottom of the cooling box (3), and a medium outlet (10) is provided on one side of the top of the cooling box (3). The medium outlet (10) and the medium inlet (2) are connected to the circulating cooling system. The excitation winding (11) is formed by stacking multiple coils (14) along the axial direction. The multiple coils (14) are connected in series, in parallel or in a series-parallel combination. The multiple coils (14) are fastened into a whole by multiple sets of circumferentially distributed binding components (13). The coil (14) includes multiple sets of coil bundles (15) nested together. The coil bundles (15) in the same set of coils (14) are connected in series. A silicon steel spacer is provided between adjacent coil bundles (15) to form an interlayer cooling channel and optimize the magnetic field distribution.

2. The high magnetic field constant temperature vertical ring magnetic separator according to claim 1, characterized in that: The binding assembly (13) includes a pressure plate (16) and a base plate (18). The pressure plate (16) is attached to the upper end face of the uppermost wire disc (14), and the base plate (18) is attached to the lower end face of the lowermost wire disc (14). The base plate (18) is fixedly connected to the pressure plate (16) by two sets of double-headed studs (17).

3. The high magnetic field constant temperature vertical ring magnetic separator according to claim 2, characterized in that: The spacer assembly is a split design, including multiple sets of silicon steel plates (20) corresponding one-to-one with the binding assembly (13). The silicon steel plates (20) are arranged between each adjacent coil bundle (15), and the two ends of the silicon steel plates (20) are respectively inserted into the pressure plate (16) and the base plate (18).

4. The high magnetic field constant temperature vertical ring magnetic separator according to claim 3, characterized in that: The silicon steel plate (20) at the bend of the coil (15) is arc-shaped.

5. The high magnetic field constant temperature vertical ring magnetic separator according to claim 2, characterized in that: The spacer assembly is an integral design, including an annular base (23). The upper surface of the base (23) along the length and width directions is integrally provided with multiple sets of spaced vertical plates (24). The upper surface of the base (23) at the bend is integrally provided with an arc plate (25). The vertical plates (24) and the arc plate (25) are both inserted into the pressure plate (16). The base (23) is inserted into the bottom plate (18).

6. The high magnetic field constant temperature vertical ring magnetic separator according to claim 2, characterized in that: The bottom surface of the base plate (18) is provided with multiple sets of flow channels (19).

7. The high magnetic field constant temperature vertical ring magnetic separator according to claim 1, characterized in that: Insulating strips are provided between adjacent wire discs (14).

8. The high magnetic field constant temperature vertical ring magnetic separator according to claim 7, characterized in that: The insulating spacer includes a first spacer (27) and a second spacer (28); the first spacer (27) is provided in multiple sets, and the multiple sets of the first spacer (27) are arranged at both ends of the length direction of the wire disc (14); the second spacer (28) is provided in multiple sets, and the multiple sets of the second spacer (28) are arranged on both sides of the width direction of the wire disc (14).

9. The high magnetic field constant temperature vertical ring magnetic separator according to claim 8, characterized in that: Multiple sets of the second partition bar (28) are arranged obliquely, and the angle α between the second partition bar (28) and the mainstream direction of the cooling medium is 45°-60°.

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