Magnetic separator and control method thereof

Abstract

The invention provides a magnetic separator and a control method thereof. The magnetic separator comprises a magnetic conductive shell, coils and a plurality of coil boxes stacked in the magnetic conductive shell in the height direction, a vertically-through material pipeline is arranged in the middle of the magnetic conductive shell, each coil box is internally provided with one coil, the upper surface and the lower surface of each coil are each provided with a plurality of partition strips, and the partition strips are arranged in the middle of the magnetic conductive shell. A first channel filled with insulating oil is arranged among the plurality of division bars, one end of the coil box is provided with an oil inlet, the other end of the coil box is provided with an oil outlet, and the oil inlet, the first channel and the oil outlet are communicated; and a magnetic gathering roller is arranged in the material pipeline. A plurality of independent coil boxes are designed in the magnetic separator, and each excitation coil is independently placed in one coil box, so that the coils are ensured to be in an independent and clean working environment, the pollution of the outside to the coils is reduced, the stability of a magnetic field of the magnetic separator is ensured, the service life of the coils is prolonged, and the operation stability of the magnetic separator is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery processing, and in particular to a magnetic separator and a control method thereof. Background Art

[0002] As an important direction of green and low-carbon development, the new energy industry is booming at an unprecedented speed. As an efficient and rechargeable energy storage device, lithium batteries are widely used in new energy vehicles, consumer electronics and energy storage systems. With the rapid growth of lithium battery demand, the production quality and efficiency of lithium battery materials have become the focus of attention in the industry. Lithium battery materials include positive electrode materials (such as lithium iron phosphate, lithium nickel cobalt manganese oxide), negative electrode materials (such as graphite, silicon-based materials) and lithium salts in the electrolyte. Their purity and uniformity directly affect the performance and life of the battery.

[0003] During the production process of lithium battery materials, a certain amount of ferromagnetic impurities may be mixed into the raw materials. If these impurities cannot be effectively removed, they will seriously affect the conductivity of the lithium battery, reduce the cycle life of the battery, and even in extreme cases, may cause battery short circuits and safety problems.

[0004] Magnetic separation technology has gradually become the mainstream method for removing impurities from lithium battery materials due to its high efficiency and precision. Magnetic separators can generate strong magnetic fields to absorb and separate ferromagnetic impurities in materials, thereby ensuring the purity of lithium battery materials. The service life of the sensor coil, as the core component of the magnetic separator, affects the life of the entire magnetic separator. At present, there are several problems with magnetic separators: (1) The magnetic separator excitation coil is directly placed in the magnetic casing, which is filled with insulating oil. Impurities in the casing can easily contaminate the insulating oil, reduce the insulation of the coil, and reduce the service life of the coil. At the same time, if one coil is contaminated in the magnetic casing, the other coils will also be contaminated and damaged, resulting in greater losses and increased maintenance costs. (ii) The magnetic separator excitation coil is cooled by immersing the coil directly in insulating oil. The insulating oil exchanges heat with external cooling water, which has only a single heat exchange path, resulting in low coil cooling efficiency. In addition, the magnetic shell is large in size, which easily creates dead corners for the insulating oil flow, causing the temperature in the local area to be too high, causing the coil insulation layer to burn out, resulting in a short circuit between the coil turns and the coil burning out. (3) The water pressure and temperature of the insulating oil and cooling water of the magnetic separator are passively controlled. When the heat generated by the coil is too high, the flow rate and temperature of the insulating oil and cooling water cannot be adjusted autonomously. When the temperature is too high, the insulation layer of the coil is easily burned, shortening the service life of the coil. Summary of the invention

[0005] The object of the present invention is to provide a magnetic separator and a control method thereof, which can increase the service life of the coil.

[0006] The technical solution of the present invention is: a magnetic separator, comprising a magnetic shell, a coil and a plurality of coil boxes stacked in the height direction of the magnetic shell, a material pipeline penetrating up and down is provided in the middle of the magnetic shell, each of the coil boxes is provided with a coil, a plurality of partitions are provided on the upper and lower surfaces of the coil, a first channel filled with insulating oil is provided between the plurality of partitions, an oil inlet is provided at one end of the coil box, an oil outlet is provided at the other end, the oil inlet, the first channel and the oil outlet are connected; a magnetic focusing roller is provided in the material pipeline.

[0007] In the above scheme, multiple independent coil boxes are designed in the magnetic separator, and each excitation coil is placed separately in a coil box to ensure that the coil is in an independent and clean working environment, ensure the stability of the magnetic field of the magnetic separator, and increase the service life of the coil.

[0008] Preferably, the oil inlet is installed with a first pressure gauge to monitor the oil inlet pressure in a single coil box in real time; the oil outlet is installed with a first thermometer to monitor the oil outlet temperature in a single coil box in real time; so as to actively adjust the flow rate of the insulating oil in the coil box and then adjust the temperature of the insulating oil.

[0009] Preferably, a second channel filled with cooling water is formed between the plurality of coil boxes and the magnetic shell, a water inlet is provided at one end of the magnetic shell, a water outlet is provided at the other end, and the water inlet, the second channel and the water outlet are connected.

[0010] Preferably, the water inlet is installed with a second pressure gauge to monitor the inlet pressure of the cooling water in the second channel in real time; the water outlet is installed with a second thermometer to monitor the outlet temperature of the cooling water in the second channel in real time, so as to actively adjust the flow rate of the cooling water and then adjust the temperature of the cooling water.

[0011] The present invention also provides a control method for the magnetic separator, comprising: Step 1: Set the oil outlet temperature and oil inlet pressure of a single coil box; Step 2: Start the magnetic separator, and the raw material passes through the material pipeline. Under the action of the magnetic roller and the coil, the impurities in the raw material are adsorbed on the magnetic roller, and the filtered raw material is discharged from the material pipeline; Step 3: Insulating oil is introduced into the oil inlet of each coil box until the oil inlet pressure reaches a preset value, and the insulating oil passes through the first channels on the upper surface and the lower surface of the coil and is discharged from the oil outlet; Step 4: monitor the oil outlet temperature of the oil outlet in real time and compare it with the set temperature value. If it exceeds the preset value, increase the oil inlet flow rate of the oil inlet until the oil outlet temperature of the oil outlet reaches the set temperature value; if it is lower than the preset value, reduce the oil inlet flow rate of the oil inlet until the oil outlet temperature of the oil outlet reaches the set temperature value; The above steps 2, 3 and 4 are performed simultaneously.

[0012] Preferably, step one further comprises setting the water outlet temperature and water inlet pressure of the magnetically conductive housing; In step three, cooling water is charged into the second channel from the water inlet until the water inlet pressure reaches a preset value, and the cooling water flows around the outer surfaces of the multiple coil boxes and is discharged from the water outlet; In step 4, the outlet water temperature is monitored in real time and compared with the set outlet water temperature value; if the outlet water temperature exceeds the preset value, the water inlet flow rate is increased or the inlet water temperature is reduced until the outlet water temperature reaches the set temperature value.

[0013] Compared with the related art, the present invention has the following beneficial effects: 1. The present invention designs a plurality of independent coil boxes in the magnetic separator, and each excitation coil is placed in a coil box separately, so as to ensure that the coil is in an independent and clean working environment, reduce external pollution to the coil, ensure the stability of the magnetic field of the magnetic separator, and improve the service life of the coil and the stability of the operation of the magnetic separator; Second, each coil box is provided with an insulating oil cooling channel (first channel), and a cooling water channel (second channel) is provided in the magnetic shell, forming an independent double interactive cooling structure, which greatly improves the coil cooling efficiency; 3. Each coil box is provided with an insulating oil cooling channel (first channel). Compared with providing insulating oil in the magnetic conductive shell, since the volume of the coil box is smaller than that of the magnetic conductive shell, the probability of insulating oil generating dead corners is reduced, thereby increasing the coil cooling range, improving the coil cooling efficiency and extending the coil service life; 4. Monitor the inlet (oil) pressure and outlet (oil) temperature through the pressure gauge and thermometer to achieve autonomous regulation of insulating oil and cooling water, and regulate the flow and temperature of insulating oil and cooling water online, so that each coil of the demagnetizer works at a relatively uniform and stable temperature, effectively avoiding the phenomenon of burning the insulation layer of the coil due to excessive temperature, extending the service life of the coil, improving the stability of the equipment and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A structural schematic diagram of a magnetic separator provided by the present invention from a first viewing angle; Figure 2 A schematic structural diagram of a second viewing angle of the magnetic separator provided by the present invention; Figure 3 It is a schematic diagram of the internal structure of a single coil box; Figure 4 for Figure 3 A top view of Figure 5The schematic diagram of the connection structure of the magnetic separator, cooling circulation system and host computer (I); Figure 6 Schematic diagram of the connection structure of the magnetic separator, cooling circulation system and host computer (II) Figure 7 This is a flow chart of the magnetic separator control method.

[0015] In the attached drawings: 1. host computer; 2. cooling circulation system; 3. magnetic conductive shell; 4. coil box; 5. magnetic roller; 6. material pipeline; 7. partition bar; 8. water inlet; 9. second pressure gauge; 10. water outlet; 11. second thermometer; 12. coil; 13. first channel; 14. second channel; 15. oil inlet; 16. oil outlet; 17. first pressure gauge; 18. first thermometer. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0017] like Figure 1 , Figure 2 As shown, a magnetic separator provided in this embodiment includes a magnetic conductive shell 3, a coil box 4, a magnetic focusing roller 5, a material pipeline 6, a spacer 7, a water inlet 8, a second pressure gauge 9, a water outlet 10, a second thermometer 11, a coil 12, a first channel 13, a second channel 14, an oil inlet 15, an oil outlet 16, a first pressure gauge 17 and a first thermometer 18.

[0018] The magnetic housing 3 is a cylindrical structure with a cylindrical hole inside. A material pipeline 6 is installed in the cylindrical hole. Both ends of the material pipeline 6 are connected to transport raw materials. A plurality of coil boxes 4 are stacked in the height direction inside the magnetic housing 3. A spacer is set between two adjacent coil boxes 4. Figure 2 As shown, each coil box 4 is provided with a coil 12, so that the coil 12 has an independent working environment. The structure of a single coil box 4 and a coil 12 is as shown in FIG. Figure 3 As shown, the coil box 4 has an oil inlet 15 at one end and an oil outlet 16 at the other end. Figure 3 , Figure 4As shown, a plurality of spacers 7 are provided on the upper and lower surfaces of the coil 12. The plurality of spacers 7 are plate-like structures in the long direction, and are evenly spaced on the circular surface of the coil 12. The spacers 7 have a certain thickness, and are in contact with the top inner wall or the bottom inner wall of the coil box 4 and the coil 12, respectively, so that a gap is formed between the coil 12 and the coil box 4, and the gap is the first channel 13 for the insulating oil to pass through. The oil inlet 15, the first channel 13 and the oil outlet 16 are connected. The insulating oil is used for insulation and cooling of the coil 12. The arrangement and structure of the spacers 7 can ensure that the insulating oil reaches every corner of the coil 12, so that the coil 12 has no cooling dead corners. The insulating oil in each coil box 4 circulates independently, reducing the probability of all coils 12 being contaminated at the same time. If one or some coils 12 are damaged by contamination, only the broken coil 12 needs to be repaired and replaced, reducing the replacement cost.

[0019] The oil inlet 15 is equipped with a first pressure gauge 17 to monitor the oil inlet pressure in a single coil box 4 in real time; the oil outlet 16 is equipped with a first thermometer 18 to monitor the oil outlet temperature in a single coil box 4 in real time; so as to actively adjust the flow rate of the insulating oil in the coil box 4, and then adjust the temperature of the insulating oil to ensure that the coil 12 operates within a safe temperature range.

[0020] The magnetic conductive shell 3 can be made of magnetic conductive material to make the magnetic field generated by the coil 12 smooth and reduce the magnetic field loss. The material pipeline 6 is provided with a magnetic collecting roller 5, and the material pipeline 6 can be made of stainless steel to prevent the material (raw material) from being contaminated when passing through. When the material passes through the material pipeline 6, the magnetic collecting roller 5 absorbs the magnetic impurities in the material, and the non-magnetic material flows out through the material pipeline 6, thereby realizing the separation of magnetic material and non-magnetic material.

[0021] The material of the magnetic focusing roller 5 is a high magnetic flux density magnetic conductive material with high magnetic saturation, which can have a strong adsorption ability for magnetic substances and has good corrosion resistance and rust resistance after surface treatment.

[0022] The coil box 4 and the magnetic conductive shell 3 are made of the same material, so that the effective magnetic path between each coil 12 is the longest, the magnetic field loss is reduced, the magnetic field on the magnetic roller 5 is stronger, and the adsorption capacity of the magnetic roller 5 to magnetic materials is improved.

[0023] like Figure 1 As shown, a second channel 14 filled with cooling water is formed between the plurality of coil boxes 4 and the magnetic shell 3. A water inlet 8 is provided at one end of the magnetic shell 3, and a water outlet 10 is provided at the other end. The water inlet 8, the second channel 14 and the water outlet 10 are connected.

[0024] The water inlet 8 is installed with a second pressure gauge 9 to monitor the water inlet pressure of the cooling water in the second channel 14 in real time; the water outlet 10 is installed with a second thermometer 11 to monitor the water outlet temperature of the cooling water in the second channel 14 in real time to actively adjust the flow rate of the cooling water and then adjust the temperature of the cooling water.

[0025] The first pressure gauge 17 and the second pressure gauge 9 monitor the pressure so that the host computer 1 can obtain the flow value.

[0026] like Figure 5 , Figure 6 As shown, the water inlet 8, the water outlet 10, the oil inlet 15 and the oil outlet 16 of the magnetic separator are respectively connected to the cooling circulation system 2, and the circulation of insulating oil and cooling water is realized through the cooling circulation system 2. The cooling circulation system 2 is controlled by the host computer 1, and the first pressure gauge 17, the second pressure gauge 9, the first temperature gauge 18 and the second temperature gauge 11 communicate with the host computer 1.

[0027] like Figure 7 As shown, the present invention also provides a control method for an upper magnetic separator, comprising: Step 1: Set the oil outlet temperature and oil inlet pressure of the single coil box 4; set the water outlet temperature and water inlet pressure of the magnetic housing 3; Step 2: Start the magnetic separator through the host computer 1 and pass current through the magnetic separator. The raw material passes through the material pipeline 6. Under the action of the magnetic roller 5 and the coil 12, impurities in the raw material are adsorbed on the magnetic roller 5, and the filtered raw material is discharged from the material pipeline 6.

[0028] Step 3: The cooling circulation system 2 respectively introduces insulating oil from the oil inlet 15 on each of the coil boxes 4 and reaches the preset oil inlet pressure value, and the insulating oil passes through the first channels 13 on the upper and lower surfaces of the coil 12 and is discharged from the oil outlet 16; the cooling circulation system 2 fills cooling water from the water inlet 8 into the second channel 14 and reaches the preset water inlet pressure value, and the cooling water circulates around the outer surfaces of multiple coil boxes 4 and is discharged from the water outlet 10; Step 4, monitor the oil outlet temperature of the oil outlet 16 in real time, and send the monitored oil outlet temperature value to the host computer 1; monitor the water outlet temperature of the water outlet 10 in real time, and send the monitored water outlet temperature value to the host computer 1. The host computer 1 compares the received oil outlet temperature value with the preset value of the oil outlet temperature, and compares the received water outlet temperature value with the preset value of the water outlet temperature. If the oil outlet temperature value exceeds the preset value of the oil outlet temperature, at this time, if the water outlet temperature value is lower than the preset value of the water outlet temperature, the oil inlet flow rate of the oil inlet 15 is increased until the oil outlet temperature of the oil outlet 16 reaches the set temperature value. If the oil outlet temperature value exceeds the preset value of the oil outlet temperature, at this time, if the water outlet temperature value exceeds the preset value of the water outlet temperature, in addition to performing the above steps to adjust the flow rate of the insulating oil, it is also necessary to increase the water inlet flow rate of the water inlet 8 or reduce the water inlet temperature of the water inlet 8 until the water outlet temperature of the water outlet 10 reaches the set temperature value. If the oil outlet temperature value is lower than the preset oil outlet temperature value, at this time, if the water outlet temperature value exceeds the preset water outlet temperature value, the flow rate of the water inlet 8 is adjusted according to the above steps. If the water outlet temperature value is lower than the preset water outlet temperature value, no adjustment is required. In the above adjustment process, the first pressure gauge 9 and the second pressure gauge 17 sense the flow rate and send it to the host computer 1.

[0029] The above steps 2, 3 and 4 are performed simultaneously.

[0030] If the temperature of the oil outlet 16 of one or more coil boxes 4 exceeds the preset value, only the oil inlet flow rate of the coil box 4 that exceeds the preset value is adjusted to achieve rapid cooling of the insulating oil and ensure that the coil 12 operates within a safe temperature range.

[0031] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A magnetic separator, comprising a magnetic casing (3) and a coil (12), wherein a material pipeline (6) is provided in the middle of the magnetic casing (3) and passes through the material pipeline (6) vertically, wherein: It also includes a plurality of coil boxes (4) stacked in the height direction within the magnetic conductive housing (3), each of the coil boxes (4) being provided with a coil (12), the upper surface and the lower surface of the coil (12) being provided with a plurality of spacers (7), a first channel (13) filled with insulating oil being provided between the plurality of spacers (7), an oil inlet (15) being provided at one end of the coil box (4), and an oil outlet (16) being provided at the other end, the oil inlet (15), the first channel (13) and the oil outlet (16) being connected; and a magnetic focusing roller (5) being provided in the material pipeline (6).

2. The magnetic separator according to claim 1, characterized in that: The oil inlet (15) is equipped with a first pressure gauge (17) to monitor the oil inlet pressure in the single coil box (4) in real time; the oil outlet (16) is equipped with a first temperature gauge (18) to monitor the oil outlet temperature in the single coil box (4) in real time; and the flow rate of the insulating oil in the coil box (4) is actively adjusted, thereby adjusting the temperature of the insulating oil.

3. The magnetic separator according to claim 1, characterized in that: A second channel (14) filled with cooling water is formed between the plurality of coil boxes (4) and the magnetic housing (3); a water inlet (8) is provided at one end of the magnetic housing (3) and a water outlet (10) is provided at the other end; the water inlet (8), the second channel (14) and the water outlet (10) are in communication.

4. The magnetic separator according to claim 3, characterized in that: The water inlet (8) is equipped with a second pressure gauge (9) to monitor the water inlet pressure of the cooling water in the second channel (14) in real time; the water outlet (10) is equipped with a second temperature gauge (11) to monitor the water outlet temperature of the cooling water in the second channel (14) in real time, so as to actively adjust the flow rate of the cooling water and thereby adjust the temperature of the cooling water.

5. A control method for a magnetic separator according to any one of claims 1 to 4, characterized in that: include: Step 1, setting the oil outlet temperature and oil inlet pressure of a single coil box (4); Step 2: start the magnetic separator, and the raw material passes through the material pipeline (6). Under the action of the magnetic roller (5) and the coil (12), impurities in the raw material are adsorbed onto the magnetic roller (5), and the filtered raw material is discharged from the material pipeline (6); Step three, insulating oil is introduced into the oil inlet (15) on each coil box (4) until the oil inlet pressure reaches a preset value, and the insulating oil passes through the first channels (13) on the upper and lower surfaces of the coil (12) and is then discharged from the oil outlet (16); Step 4: monitor the oil outlet temperature of the oil outlet (16) in real time and compare it with a set temperature value. If it exceeds the set value, increase the oil inlet flow rate of the oil inlet (15) until the oil outlet temperature of the oil outlet (16) reaches the set temperature value; if it is lower than the set value, reduce the oil inlet flow rate of the oil inlet (15) until the oil outlet temperature of the oil outlet (16) reaches the set temperature value; The above steps 2, 3 and 4 are performed simultaneously.

6. The control method according to claim 5, characterized in that: Step one also includes setting the water outlet temperature and water inlet pressure of the magnetic conductive housing (3); In step three, cooling water is charged into the second channel (14) from the water inlet (8) until the water inlet pressure reaches a preset value, and the cooling water circulates around the outer surfaces of the plurality of coil boxes (4) and is discharged from the water outlet (10); In step 4, the outlet water temperature of the water outlet (10) is monitored in real time and compared with a set outlet water temperature value; if the outlet water temperature exceeds the preset value, the water inlet flow rate of the water inlet (8) is increased or the water inlet temperature of the water inlet (8) is reduced until the outlet water temperature of the water outlet (10) reaches the set temperature value.

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