Demagnetizing machine with drying system

Abstract

The utility model discloses a demagnetizing machine with a drying system, which comprises a sealing shell (13) and a plurality of coils (7) arranged in the sealing shell, a material channel (2) is arranged in the middle of the sealing shell, a screen (1) is arranged in the material channel, an oil inlet (10) and an oil outlet (11) are arranged on the sealing shell, and the oil inlet (10) is communicated with the oil outlet (11). A cooling channel (14) filled with heat conduction oil is arranged between the sealing shell and the coil, a flow guide channel is arranged between the cooling channel and the material channel, the oil inlet, the cooling channel, the flow guide channel and the oil outlet are sequentially communicated, and the oil inlet is communicated with a conveying oil pump (F101) through a first oil guide pipe (G301). The material drying system is integrated, and waste heat generated by the demagnetizer system can be effectively utilized to dry materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to a demagnetizer, in particular to a demagnetizer with drying system. BACKGROUND

[0002] The processing and preparation of negative electrode materials is an important link in the lithium battery industry, and the quality of finished negative electrode materials has a significant impact on the performance, service life and safety stability of lithium battery products. Compared with other factors, the content of magnetic impurities in negative electrode materials has a more prominent impact on the performance, service life and safety stability of lithium battery products. Because the magnetic impurity particles in the negative electrode material may pierce the battery separator during the charging and discharging process of the lithium ion battery, causing internal short circuit of the battery, thus triggering rapid self-discharge, affecting the safety performance of the battery, and seriously reducing the service life of the battery. Therefore, the demagnetization process for reducing the magnetic impurities in the negative electrode material is an essential step in the processing of negative electrode materials.

[0003] The key equipment used in the demagnetization process is a demagnetizer, which intermittently generates a magnetic field in the screen through the principle of electrically generated magnetism, to separate the target components and magnetic impurities in the negative electrode material, thereby improving the purity and quality of the negative electrode material. The degree of material agglomeration has a decisive influence on the demagnetization capacity of the demagnetizer, and the moisture content of the material is one of the key factors affecting the degree of material agglomeration. Therefore, it is necessary to reduce the moisture content of the material to improve the demagnetization effect of the negative electrode material.

[0004] Traditional demagnetizers, such as Chinese patent CN117920572A, include an electromagnetic body, a cylinder, a material channel, a screen, a separation valve in the form of a three-way component, and a rack. The material enters the demagnetizer through the feed end of the material channel, separates the magnetic impurities and non-magnetic materials through the screen, and then exits the demagnetization system through the discharge end of the material channel. Obviously, this demagnetizer does not have a material drying system. When in use, since the material itself contains a certain amount of moisture, combined with the presence of a large number of non-drying surfaces and areas in the demagnetizer, these surfaces and areas contain a high amount of moisture, which further increases the moisture content of the material entering the demagnetizer. Excessive moisture content of the material can cause the target components and magnetic impurities to agglomerate and adhere to the screen structure when the material passes through the screen, resulting in a reduction in the flow area of the screen, and thus a reduction in the material flow rate, system demagnetization capacity and yield, greatly affecting the demagnetization performance.

[0005] At present, some magnetic removal machines also use an independent drying system to dry the material, that is, an independent drying device is added in front of or above the magnetic removal machine, and the material is dried by the drying device before entering the magnetic removal machine. However, in this case, the material channel, screen and separation valve of the magnetic removal machine are still non-drying surfaces and areas, and the moisture on these surfaces and areas will increase the water content of the material entering the magnetic removal machine. Moreover, the independent drying system often occupies a large space, which increases the space resource load of the production line platform. In addition, the independent drying system cannot utilize the waste heat generated by the magnetic removal machine, but only realizes the function by consuming other energy, which increases the energy cost. Moreover, the increase of the equipment leads to the increase of the system complexity, the increase of the failure rate and the increase of the maintenance cost. In addition, the material retained due to van der Waals force or electrostatic force will also increase, which will reduce the yield.

[0006] In addition, the independent drying system cannot utilize the waste heat generated by the magnetic removal machine, but only realizes the function by consuming other energy, which increases the energy cost. Moreover, the increase of the equipment leads to the increase of the system complexity, the increase of the failure rate and the increase of the maintenance cost. In addition, the material retained due to van der Waals force or electrostatic force will also increase, which will reduce the yield. The utility model discloses to solve the technical problems that the prior art cannot dry the material sufficiently, and provides a magnetic removal machine capable of drying the material by utilizing waste heat of the magnetic removal machine and a control method thereof.

[0007] The utility model discloses to solve the technical problems that the prior art cannot dry the material sufficiently, and provides a magnetic removal machine capable of drying the material by utilizing waste heat of the magnetic removal machine and a control method thereof.

[0008] To solve the above technical problems, the utility model adopts the following technical scheme:

[0009] A magnetic removal machine with a drying system, comprising a sealed shell and a plurality of coils installed in the sealed shell, a material channel is arranged in the middle of the sealed shell, a screen is installed in the material channel, an oil inlet and an oil outlet are arranged on the sealed shell, a cooling channel filled with heat-conducting oil is arranged between the sealed shell and the coils, a flow guide channel is arranged between the cooling channel and the material channel, the oil inlet, the cooling channel, the flow guide channel and the oil outlet are sequentially communicated, and the oil inlet is communicated with a conveying oil pump through a first oil guide pipe.

[0010] In this way, the utility model integrates a drying system in the sealed shell of the magnetic removal machine, and converts the waste heat generated by the coils of the magnetic removal machine into a heat source of the drying system. Specifically, the utility model utilizes the collected coil waste heat to form a high-temperature oil flow through the flow guide channel outside the material channel, directly transfers the waste heat to the material channel, and then heats the screen and the material, so as to realize the drying of the material. This design not only saves space resources, reduces energy costs, simplifies the system, reduces maintenance costs, but also improves the magnetic removal effect.

[0011] Preferably, a heat supplement module is installed in the flow guide channel, the heat supplement module comprises an auxiliary heating coil connected with a periodically changing current and generating a changing magnetic field, and the auxiliary heating coil generates a magnetic field in the same direction as the magnetic field generated by the coil. In this way, the utility model can also directly heat the structures in contact with the material, such as the material channel, the screen mesh and the screen mesh shaft, by using the induction heat supplement module, so as to reduce the non-drying surface and area in the material channel, further reduce the moisture of the material, and enhance the dispersibility of the material; meanwhile, the heat supplement module can generate an oscillating magnetic field in the same direction as the magnetic field of the coil, so as to further strengthen the central magnetic field intensity, improve the adsorption capacity of the magnetic impurities, and further improve the demagnetization effect.

[0012] Preferably, the flow guide channel comprises a first flow guide channel and a second flow guide channel, the cooling channel, the first flow guide channel, the second flow guide channel and the oil outlet are sequentially communicated, and the auxiliary heating coil is installed in the second flow guide channel.

[0013] Preferably, a first sensor for detecting the temperature of the auxiliary heating module is installed in the second flow guide channel.

[0014] Preferably, a second sensor for detecting the temperature of the material channel is installed in the material channel.

[0015] Preferably, the oil outlet is communicated with the heat medium inlet of the heat exchanger through a second oil guide pipe, and the conveying oil pump is communicated with the cold medium outlet of the heat exchanger, so as to fully utilize the waste heat.

[0016] Preferably, an oil inlet is further arranged on the sealing shell, so as to fill the heat conducting oil in the sealing shell before the demagnetizer is started.

[0017] Based on the same inventive concept, the utility model also provides a control method of the demagnetizer, which comprises the following steps:

[0018] The conveying oil pump is started, and the heat conducting oil continuously enters the oil inlet, the cooling channel, the heat conducting channel and the material channel in sequence through the conveying oil pump, and then flows out from the oil outlet, and at the same time, the coil is powered on to generate a background magnetic field at the screen mesh;

[0019] When the temperature of the material channel meets the preset standard, the material channel is started to feed the material, otherwise the heat supplement module is started until the temperature of the material channel reaches the preset standard and then the material is fed;

[0020] The material continuously enters the screen mesh from the feeding end of the material channel, is dried by the waste heat collected by the heat conducting oil and / or the induction heat generated by the auxiliary heating coil after being powered on, and is demagnetized by the magnetic field generated in the screen mesh, so as to finally complete the drying and demagnetization of the material and then discharge the material from the discharging end of the material channel.

[0021] Preferably, the preset standard of the material passage temperature is 100-150 DEG C.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] 1) The utility model discloses a drying system that utilizes waste heat and induction heating screen in the demagnetization system, which is used to heat the material passage and the screen and other structures that mainly contact with the material, reduces the non-drying surface and area in the material passage, reduces the degree of material agglomeration due to high moisture, reduces the moisture content in the material, enhances the dispersibility of the material, and improves the flow effect and demagnetization effect of the demagnetization system.

[0024] 2) The utility model discloses a drying system that utilizes waste heat and induction heating screen in the demagnetization system, which is used to heat the material passage and the screen and other structures that mainly contact with the material, reduces the non-drying surface and area in the material passage, reduces the degree of material agglomeration due to high moisture, reduces the moisture content in the material, enhances the dispersibility of the material, and improves the flow effect and demagnetization effect of the demagnetization system.

[0025] 3) The utility model discloses a drying system that utilizes waste heat and induction heating screen in the demagnetization system, which is used to heat the material passage and the screen and other structures that mainly contact with the material, reduces the non-drying surface and area in the material passage, reduces the degree of material agglomeration due to high moisture, reduces the moisture content in the material, enhances the dispersibility of the material, and improves the flow effect and demagnetization effect of the demagnetization system.

[0026] 4) The utility model discloses a drying system that utilizes waste heat and induction heating screen in the demagnetization system, which is used to heat the material passage and the screen and other structures that mainly contact with the material, reduces the non-drying surface and area in the material passage, reduces the degree of material agglomeration due to high moisture, reduces the moisture content in the material, enhances the dispersibility of the material, and improves the flow effect and demagnetization effect of the demagnetization system. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 It is the structural section schematic view of the utility model.

[0029] Figure 2 The working flow chart of the utility model.

[0030] In the figure: 1-screen, 2-material channel, 201-feeding end, 202-discharge end, 3-screen shaft, 4-first flow guide channel, 5-auxiliary heating coil, 6-second flow guide channel, 7-coil, 8-first sensor, 9-second sensor, 10-oil inlet, 11-oil outlet, 12-oil injection port, 13-sealing shell; 14-cooling channel; F101-conveying oil pump, F102-heat exchanger, G301-first oil guide pipe, G302-second oil guide pipe. DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with specific preferred embodiments, but it is not limited to the protection scope of the utility model.

[0032] In the description of the utility model, it should be pointed out that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. The device or element indicated or implied must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the utility model, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] Please refer to Figure 1 The utility model has a drying system demagnetizer one embodiment mainly by drying demagnetization system and pumping cooling system, wherein, drying demagnetization system mainly by screen 1, material channel 2, feeding end 201, discharge end 202, screen shaft 3, auxiliary heating coil 5, oil separation channel 1, first flow guide channel 4, second flow guide channel 6, coil 7, first sensor 8, second sensor 9, oil inlet 10, oil outlet 11, oil injection port 12, sealing shell 13 etc. constitute; pumping cooling system mainly by demagnetization machine internal heat conduction oil circuit, conveying oil pump F101, heat exchanger F102, first flow guide pipe G301 and second flow guide pipe G302 constitute.

[0035] A plurality of coils 7 are installed in the sealed housing 13, and cooling channels 14 filled with heat-conducting oil are arranged between the coils 7 and between the coils and the sealed housing 13. A material channel 2 is arranged in the middle of the sealed housing 13, and the upper end of the material channel 2 is arranged as a feeding end 201, and the lower end is arranged as a discharging end 202. A screen 1 for adsorbing magnetic substances and a screen shaft 3 are installed in the material channel 2.

[0036] An oil inlet 10, an oil outlet 11 and an oil injection port 12 are arranged on the sealed housing 13, a flow guide channel is arranged between the cooling channel 14 and the material channel 2, the flow guide channel includes a first flow guide channel 4 and a second flow guide channel 6 arranged from the outside to the inside in sequence, the oil inlet 10, the cooling channel 14, the first flow guide channel 4, the second flow guide channel 6 and the oil outlet 11 are sequentially communicated, a heat supplement module is installed in the second flow guide channel 6, the heat supplement module includes an auxiliary heating coil 5, the auxiliary heating coil 5 is connected with a periodically changing current and generates a changing magnetic field, and the direction of the magnetic field generated by the auxiliary heating coil 5 is the same as the direction of the magnetic field generated by the coil 7, the oil inlet 10 is communicated with a conveying oil pump F101 through a first oil guide pipe G301, the oil outlet 11 is communicated with a heat medium inlet of a heat exchanger F102 through a second oil guide pipe G302, and the conveying oil pump F101 is communicated with a cold medium outlet of the heat exchanger F102.

[0037] In order to facilitate temperature monitoring, a first sensor 8 for detecting auxiliary heating temperature is installed in the second flow guide channel 6, and a second sensor 9 for detecting material channel temperature is installed in the material channel 2.

[0038] The utility model discloses a working principle: the utility model discloses on the basis of the demagnetization technology of traditional demagnetizer, set up the cooling channel 14 full of heat conducting oil between sealed casing 13 and coil 7 and between adjacent coil, and set up first flow channel 4, second flow channel 6 from outside to inside in turn on the outer periphery of material channel 2, cooling channel 14, first flow channel 4, second flow channel 6 are communicated in turn, so that the heat conducting oil road system in the demagnetization system and material channel 2 are combined, not only design oil circuit between material channel 2 and coil 7 to be the oil outlet oil circuit of high temperature oil, make material channel 2 be heated to 60~100 DEG C under the action of high temperature oil simultaneously, material channel 2 passes heat to screen 1 and material again, thereby play the role of material preheating, simultaneously, because the heat conducting oil temperature of initial feeding demagnetization stage is lower, the material drying effect is unstable at this time, therefore design a group of heat supplement module between material channel 2 and coil 7, the auxiliary heating coil of heat supplement module is connected with periodical change current and produces change magnetic field, and the direction of the magnetic field produced by auxiliary heating coil is same with the magnetic field produced by coil, make the total magnetic field in material channel 2 change periodically, and then produce induced current in screen 1, and make it heat, namely the heating effect produced by heat supplement module directly acts on screen 1, make the final working temperature of material channel 2 and screen 1 be 100~150 DEG C, realize the drying heating function of material and screen 1.

[0039] As Figure 2As shown, the process flow of the utility model for patent starts from the opening of the oil inlet 12, so that the external heat conduction oil flows into the magnetic oil removal system (cooling channel 14). After the oil reaches the standard, the oil inlet 12 is closed, and the pumping cooling system is started, and the heat conduction oil enters the delivery oil pump F101. Subsequently, the heat conduction oil continuously flows under the action of the delivery oil pump F101, enters the cooling channel 14 in the sealed shell 13 through the first oil pipe G301. In the cooling channel 14, the heat conduction oil absorbs the heat generated by the coil 7 due to the resistance, and sequentially flows through the first flow channel 4 and the second flow channel 6. At this time, the high-temperature heat conduction oil contacts the material channel 2 and transmits heat to the material channel 2 to play a heating role. When the cooling oil flows through the second flow channel 6 and is full, it enters the second oil pipe G302 through the oil outlet 11. Then, the high-temperature oil enters the heat exchanger F102 for cooling to generate low-temperature cooling oil. At the same time, the coil 7 is electrified to generate a background magnetic field at the screen 1, and the coil 7 generates resistance heat. The heat absorption of the heat conduction oil heats the material channel 2, and the material channel 2 transmits heat to the screen 1. If the second sensor 9 monitors that the temperature meets the preset standard, the feeding of the material channel 2 is started; otherwise, the heating supplement module is started, that is, the auxiliary coil 5 is connected to the oscillating current in the same direction as the coil 7. The auxiliary coil 5 generates a positive change magnetic field in the same direction as the coil 7 in the screen 1, and the screen 1 generates an induced current and generates an induced heat under the action of the positive change magnetic field, until the material channel temperature reaches the preset standard, and the feeding is started. The material continuously enters from the feeding end 201 of the material channel 2, and after the drying and magnetic removal of the material, the material is discharged from the discharging end 202.

[0040] The above is only a specific implementation of the utility model for patent, but the protection scope of the utility model for patent is not limited thereto. Any person skilled in the art can make many possible changes and modifications to the technical solution of the utility model for patent or modify it into equivalent embodiments with equivalent changes without departing from the technical solution of the utility model for patent. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model for patent should fall within the protection scope of the technical solution of the utility model for patent.

Claims

1. A demagnetizer with a drying system, comprising a sealed housing (13) and a plurality of coils (7) installed in the sealed housing, a material passage (2) is arranged in the middle of the sealed housing, a screen (1) is installed in the material passage, characterized in that, The sealing shell is provided with an oil inlet (10) and an oil outlet (11), a cooling channel (14) filled with heat-conducting oil is arranged between the sealing shell and the coil, a flow guide channel is arranged between the cooling channel and the material channel, the oil inlet, the cooling channel, the flow guide channel and the oil outlet are sequentially communicated, and the oil inlet is communicated with a delivery oil pump (F101) through a first oil guide pipe (G301).

2. The demagnetizer having a drying system according to claim 1, wherein, A heat supplement module is installed in the flow guide channel, the heat supplement module comprises an auxiliary heating coil (5), the auxiliary heating coil is connected with a periodically changing current and generates a changing magnetic field, and the direction of the magnetic field generated by the auxiliary heating coil is the same as the direction of the magnetic field generated by the coil.

3. The demagnetizer having a drying system according to claim 2, wherein, The flow guide channel comprises a first flow guide channel (4) and a second flow guide channel (6), the cooling channel, the first flow guide channel, the second flow guide channel and the oil outlet are sequentially communicated, and the auxiliary heating coil is installed in the second flow guide channel.

4. The demagnetizer having a drying system according to claim 3, wherein A first sensor (8) for detecting the temperature of the auxiliary heating coil is installed in the second flow guide channel.

5. The demagnetizer having a drying system according to claim 3, wherein A second sensor (9) for detecting the temperature of the material channel is installed in the material channel.

6. The demagnetizer having a drying system according to claim 1, wherein, The oil outlet is communicated with a heat medium inlet of a heat exchanger (F102) through a second oil guide pipe (G302), and the delivery oil pump is communicated with a cold medium outlet of the heat exchanger.

7. The demagnetizer having a drying system according to claim 1, wherein An oil injection port (12) is further arranged on the sealing shell.

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