Negative pressure flow-aiding full-automatic series powder demagnetization system

Abstract

The utility model provides a kind of negative pressure flow-aiding full-automatic series connection type powder demagnetization system, including demagnetizer and negative pressure drainage device, demagnetizer has the demagnetization pipeline for material to go in and out, electromagnetic module is equipped in demagnetization pipeline, electromagnetic module is used to adsorb magnetic impurities, the number of demagnetizer is at least two, each demagnetizer is sequentially connected together along material conveying direction, and the outlet of the demagnetization pipeline of previous demagnetizer and the inlet of the demagnetization pipeline of subsequent demagnetizer are communicated in material conveying direction;Negative pressure drainage device is set on last demagnetizer in material conveying direction, and one end of negative pressure drainage device is communicated at the position after passing through electromagnetic module adsorbing magnetic impurities in demagnetization pipeline, and negative pressure drainage device is used to provide negative pressure for demagnetization pipeline.The negative pressure flow-aiding full-automatic series connection type powder demagnetization system of the utility model can remove impurities with different magnetic strength in material, and can eliminate the problem of missing caused by poor material flow.

Description

Technical Field

[0001] This utility model relates to the field of material demagnetization technology, and in particular to a negative pressure-assisted flow fully automatic series-type powder demagnetization system. Background Technology

[0002] In the production process of negative electrode materials for electric vehicle batteries, material demagnetization is a key step to ensure product purity. However, current traditional demagnetization processes have many technical limitations. First, single-stage demagnetization is difficult to achieve efficient removal of both strong and weak magnetic impurities. Traditional solutions often employ a single-stage demagnetization design using a single set of electromagnetic coils or permanent magnets. While a strong magnetic field can effectively adsorb weak magnetic impurities, excessive magnetic force can lead to the adsorption of too much powder, causing equipment blockage. This problem arises primarily from the special characteristics of the materials: small particle size and strong electrostatic adsorption, resulting in poor demagnetization throughput. Conversely, a weak magnetic field cannot generate sufficient adsorption force for weak magnetic impurities, leaving these impurities behind and failing to meet the production requirements for high-purity materials. Secondly, manual cleaning methods are prone to secondary contamination from impurities. This problem is particularly prominent in small and medium-sized production lines: when manually cleaning adsorbed impurities, if the operation is not timely or if omissions occur during the cleaning process, the impurities can easily fall back into the powder, causing secondary contamination and directly affecting the stability of product quality. Furthermore, the demagnetization effect lacks real-time monitoring methods. Traditional processes rely on offline sampling and testing to determine the demagnetization effect, which has a significant lag. By the time the test detects excessive impurities, a certain amount of defective products have already been produced, increasing production losses. In addition, manual operation leads to poor parameter stability, affecting the consistency of demagnetization. When manually adjusting the magnetic field strength or material flow rate, process parameters are prone to fluctuation due to operational differences, making it difficult to guarantee a stable demagnetization effect. This, in turn, affects the uniformity of batch product quality and also increases the labor intensity of operators.

[0003] Therefore, it is necessary to provide at least one negative pressure-assisted flow fully automatic series powder demagnetization system to remove impurities of different magnetic intensities from the material and eliminate the problem of leakage caused by poor material flow. Utility Model Content

[0004] The purpose of this invention is to provide a negative pressure-assisted flow fully automatic series powder demagnetization system to remove impurities of different magnetic intensities from materials and eliminate the problem of leakage caused by poor material flow.

[0005] To achieve the above objectives, this utility model provides a negative pressure-assisted fully automatic series-connected powder demagnetization system, including a demagnetizer and a negative pressure diversion device. The demagnetizer has a demagnetization pipe for material inlet and outlet, and an electromagnetic module is installed inside the demagnetization pipe. The electromagnetic module is used to adsorb magnetic impurities. There are at least two demagnetizers, which are connected in series along the material conveying direction. The outlet of the demagnetization pipe of the preceding demagnetizer is connected to the inlet of the demagnetization pipe of the following demagnetizer in the material conveying direction. The negative pressure diversion device is installed on the last demagnetizer in the material conveying direction, and one end of the negative pressure diversion device is connected to the position in the demagnetization pipe after the magnetic impurities have been adsorbed by the electromagnetic module. The negative pressure diversion device is used to provide negative pressure to the demagnetization pipe.

[0006] Preferably, the negative pressure-assisted flow fully automatic series powder demagnetization system further includes a discharge airlock and a discharge pipe. One end of the discharge airlock is connected to the outlet of the demagnetization pipe of the last demagnetizer located in the material conveying direction, and the other end of the discharge airlock is connected to one end of the discharge pipe. The discharge airlock is used to open or close the outlet of the demagnetization pipe, so that the outlet of the demagnetization pipe is connected to or disconnected from the discharge pipe. Preferably, the negative pressure drainage device includes a negative pressure source and a first negative pressure connecting pipe. One end of the first negative pressure connecting pipe is connected to the position in the demagnetizing pipe after the electromagnetic module adsorbs magnetic impurities, and the other end of the first negative pressure connecting pipe is connected to the inlet of the negative pressure drainage device. Preferably, the negative pressure drainage device further includes a negative pressure shut-off fan and a second negative pressure connecting pipe. One end of the negative pressure shut-off fan is connected to the outlet of the negative pressure source, and the other end of the negative pressure shut-off fan is connected to one end of the second negative pressure connecting pipe. The negative pressure shut-off fan is used to open or close the outlet of the negative pressure source, so that the outlet of the negative pressure source is connected to or disconnected from the second negative pressure connecting pipe. The other end of the second negative pressure connecting pipe is connected at a position between the two ends of the discharge pipe. Preferably, the negative pressure-assisted flow fully automatic series-type powder demagnetization system further includes a storage tank, a packaging connection pipe module, and a packaging machine. The storage inlet of the storage tank is connected to the other end of the discharge pipe. The packaging connection pipe module is connected to the storage outlet of the storage tank and the packaging machine. The storage tank is used to store the material after impurity removal. The packaging connection pipe module is used to discharge the material in the storage tank to the packaging machine. The packaging machine is used to package the material. Preferably, the negative pressure-assisted fully automatic series-type powder demagnetization system further includes a vibration removal device and an impurity discharge pipe. The vibration removal device is disposed on the demagnetization pipe and is located in the demagnetization pipe at a position corresponding to the electromagnetic module. The impurity discharge pipe is connected to the demagnetization pipe at an incline, and the inclined upper end of the impurity discharge pipe is connected to the demagnetization pipe. The vibration removal device drives the demagnetization pipe to vibrate, causing the magnetic impurities adsorbed by the electromagnetic module to fall into the impurity discharge pipe.

[0007] Preferably, the negative pressure-assisted fully automatic series-type powder demagnetization system further includes a magnetic sensor, a camera, and an electronic control device. The magnetic sensor, the camera, the electromagnetic module, and the negative pressure drainage device are electrically connected to the electronic control device. The magnetic sensor is disposed in the area where the electromagnetic module is arranged within the demagnetization pipe. The magnetic sensor is used to detect the magnetic field strength generated by the electromagnetic module and to feed the detection signal back to the electronic control device. The camera is used to identify magnetic impurities adsorbed by the electromagnetic module. The electronic control device is used to control the negative pressure of the negative pressure drainage device and the magnetic field strength of the electromagnetic module. Preferably, the negative pressure-assisted flow fully automatic series powder demagnetization system further includes a screening machine and a screening pipe connection module. The screening machine is used to screen materials and has a screening outlet for screening out the target material. One end of the screening pipe connection module is connected to the screening outlet, and the other end of the screening pipe connection module is connected to the inlet of the demagnetization pipe of the first demagnetizer located in the material conveying direction. The screening pipe connection module includes a first screening pipe, a jacketed air supply device, and a second screening pipe connected in sequence. The first screening pipe is connected between the screening outlet and the internal channel of the jacketed air supply device, and the second screening pipe is connected between the internal channel of the jacketed air supply device and the inlet of the demagnetization pipe. The jacketed air supply device is also provided with an air guide port that connects its internal channel to the outside. Preferably, the jacketed air supply device is equipped with a filter for filtering impurities at the location of the air inlet. Preferably, the jacketed air supply device is provided with a vent cap or a one-way valve at the location of the air inlet to allow external airflow to enter the internal channel of the jacketed air supply device in one direction. Compared with existing technologies, the negative pressure-assisted flow fully automatic series-connected powder demagnetization system of this utility model, through the design of at least two demagnetizers connected in series, can differentiate the electromagnetic modules of each demagnetizer according to the differences in the magnetic properties of impurities. For example, the front-stage demagnetizer uses a magnetic field strength adapted to strong magnetic impurities, while the rear-stage demagnetizer uses a magnetic field strength adapted to weak magnetic impurities, forming a gradient demagnetization process. This graded processing mode can specifically capture strong and weak magnetic impurities, effectively solving the contradiction of "either blockage or residue" in traditional single-stage demagnetization, significantly reducing the residual amount of magnetic impurities in materials, and meeting the production requirements of high-purity materials (such as negative electrode materials for electric vehicle batteries). Meanwhile, this utility model's negative pressure-assisted fully automatic series-connected powder demagnetizing system, by setting up a negative pressure diversion device, uses negative pressure adsorption force to force the material to flow evenly and continuously within the demagnetizing pipes of each demagnetizer. This ensures that every particle of powder can fully pass through the magnetic field area of ​​each series-connected demagnetizer, completely eliminating the risk of "leakage" caused by material retention and accumulation. Furthermore, the negative pressure effect reduces electrostatic adsorption and agglomeration between the material and the inner wall of the pipe, avoiding pipe blockage problems caused by over-adsorption in traditional processes, ensuring stable operation of the production process, and improving equipment utilization. Therefore, this utility model's negative pressure-assisted fully automatic series-connected powder demagnetizing system can remove impurities of varying magnetic strengths from materials and eliminate the leakage problem caused by poor material flow. Attached Figure Description

[0008] Figure 1 This is a structural diagram of the negative pressure-assisted flow fully automatic series-type powder demagnetization system of this utility model.

[0009] Figure 2 This is a structural diagram of the negative pressure-assisted flow fully automatic series-type powder demagnetizing system of this utility model at the position of the last demagnetizer located in the material conveying direction.

[0010] Figure 3 This is a structural diagram of the demagnetizer of the negative pressure-assisted flow fully automatic series powder demagnetization system of this utility model from another angle.

[0011] Figure 4 yes Figure 1 Enlarged view of point A in the middle. Detailed Implementation

[0012] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0013] Please see Figure 1 and Figure 2The present invention discloses a fully automatic series-type powder demagnetizing system 100 with negative pressure flow assistance, comprising a demagnetizer 1 and a negative pressure diversion device 2. The demagnetizer 1 has a demagnetizing pipe 11 for material inlet and outlet, and an electromagnetic module 12 is provided inside the demagnetizing pipe 11. The electromagnetic module 12 is used to adsorb magnetic impurities. There are at least two demagnetizers 1, which are connected in series along the material conveying direction. The outlet 112 of the demagnetizing pipe 11 of the previous demagnetizer 1 is connected to the inlet 111 of the demagnetizing pipe 11 of the next demagnetizer 1 in the material conveying direction. The negative pressure diversion device 2 is set on the last demagnetizer 1 in the material conveying direction, and one end of the negative pressure diversion device 2 is connected to the position in the demagnetizing pipe 11 after the magnetic impurities are adsorbed by the electromagnetic module 12. The negative pressure diversion device 2 is used to provide negative pressure to the demagnetizing pipe 11. Specifically, each demagnetizer 1 is connected in series by a series pipe 13, and the series pipe 13 is connected between the outlet 112 of the demagnetizing pipe 11 of the previous demagnetizer 1 and the inlet 111 of the demagnetizing pipe 11 of the next demagnetizer 1.

[0014] In this system, at least two demagnetizers 1 are connected in series along the material conveying direction. In this direction, after the first demagnetizer 1 uses its electromagnetic module 12 to generate a magnetic field that adsorbs and removes magnetic impurities from the material, the material enters the next demagnetizer 1 through the series pipe 13, where it continues to be adsorbed and removed by the electromagnetic module 12. The electromagnetic modules 12 of each demagnetizer 1 can be differentiated according to the magnetic differences of the impurities. For example, the preceding demagnetizer 1 can use a magnetic field strength suitable for strongly magnetic impurities, while the subsequent demagnetizer 1 can use a magnetic field strength suitable for weakly magnetic impurities, thus specifically removing impurities of different magnetic strengths and improving the purity of the material. Simultaneously, the negative pressure adsorption force of the negative pressure diversion device 2 forces the material to flow evenly and continuously within the demagnetizing pipes 11 of each demagnetizer 1, ensuring that each particle of material can fully interact with the magnetic field area of ​​each series-connected demagnetizer 1, eliminating the problem of missed removal caused by poor material flow.

[0015] Specifically, in this embodiment, the number of demagnetizers 1 is two, but it is not limited to this.

[0016] Please see Figure 1 and Figure 2In one embodiment, the negative pressure-assisted fully automatic series-type powder demagnetization system 100 of this utility model further includes a discharge airlock fan 3 and a discharge pipe 31. One end of the discharge airlock fan 3 is connected to the outlet 112 of the demagnetization pipe 11 of the last demagnetizer 1 located in the material conveying direction, and the other end of the discharge airlock fan 3 is connected to one end of the discharge pipe 31. The discharge airlock fan 3 is used to open or close the outlet 112 of the demagnetization pipe 11, so that the outlet 112 of the demagnetization pipe 11 is connected to or disconnected from the discharge pipe 31. When it is necessary to demagnetize the material, the outlet 112 of the demagnetization pipe 11 is closed by the discharge airlock fan 3 to achieve the effect of airlock, ensuring that when the negative pressure diversion device 2 provides negative pressure adsorption force to the demagnetization pipe 11, the material on one side of the discharge pipe 31 will not enter the demagnetization pipe 11 in reverse. When it is necessary to discharge materials, the outlet 112 of the demagnetizing pipe 11 is opened by the discharge airlock 3, and the negative pressure diversion device 2 can stop providing negative pressure adsorption force to the demagnetizing pipe 11, so that the demagnetized materials can be discharged through the outlet 112 of the demagnetizing pipe 11 of the last demagnetizer 1 in the material conveying direction, and then enter the discharge pipe 31 for discharge.

[0017] Specifically, in one embodiment, the negative pressure drainage device 2 includes a negative pressure source 21 and a first negative pressure connecting pipe 22. One end of the first negative pressure connecting pipe 22 is connected to the position in the demagnetizing pipe 11 after the electromagnetic module 12 has adsorbed magnetic impurities, ensuring that each particle of material can fully interact with the magnetic field area of ​​each series demagnetizer 1. The other end of the first negative pressure connecting pipe 22 is connected to the inlet of the negative pressure drainage device 2. The negative pressure source 21 provides negative pressure adsorption force to the demagnetizing pipe 11 through the first negative pressure connecting pipe 22.

[0018] Furthermore, the negative pressure drainage device 2 also includes a negative pressure shut-off fan 23 and a second negative pressure connecting pipe 24. One end of the negative pressure shut-off fan 23 is connected to the outlet of the negative pressure source 21, and the other end of the negative pressure shut-off fan 23 is connected to one end of the second negative pressure connecting pipe 24. The negative pressure shut-off fan 23 is used to open or close the outlet of the negative pressure source 21, so that the outlet of the negative pressure source 21 is connected to or disconnected from the second negative pressure connecting pipe 24. The other end of the second negative pressure connecting pipe 24 is connected to the position between the two ends of the discharge pipe 31. When the negative pressure source 21 provides negative pressure adsorption force to the demagnetizing pipe 11 through the first negative pressure connecting pipe 22, it may also adsorb a small amount of material particles into its interior. Therefore, by setting the negative pressure shut-off fan 23 and the second negative pressure connecting pipe 24, the outlet of the negative pressure source 21 can be opened by the negative pressure shut-off fan 23, so that the outlet of the negative pressure source 21 is connected to the second negative pressure connecting pipe 24, thereby discharging the material particles adsorbed into the interior of the negative pressure source 21 back into the discharge pipe 31 through the second negative pressure connecting pipe 24.

[0019] Furthermore, a control valve may be installed on the first negative pressure connection pipe 22 to control its opening or closing, but this is not a limitation.

[0020] Specifically, in one embodiment, the demagnetizing pipe 11 of the last demagnetizer 1 located in the material conveying direction includes a first demagnetizing pipe body 113, a jacketed three-way negative pressure guide 114 and a second demagnetizing pipe body 115 arranged sequentially along the material conveying direction. The first end of the jacketed three-way negative pressure guide 114 is connected to one end of the first demagnetizing pipe body 113, the second end of the jacketed three-way negative pressure guide 114 is connected to the second demagnetizing pipe body 115, and the third end of the jacketed three-way negative pressure guide 114 is connected to the first negative pressure connecting pipe 22. The interior of the jacketed three-way negative pressure guide 114 has a Venturi nozzle structure.

[0021] Please see Figure 1 and Figure 2 In one embodiment, the negative pressure-assisted flow fully automatic series-type powder demagnetization system 100 of this utility model further includes a storage tank 4, a packaging connection pipe module 41, and a packaging machine 42. The storage inlet of the storage tank 4 is connected to the other end of the discharge pipe 31. The packaging connection pipe module 41 is connected to the storage outlet of the storage tank 4 and the packaging machine 42. The storage tank 4 is used to store the demagnetized material, and the packaging connection pipe module 41 is used to discharge the material in the storage tank 4 to the packaging machine 42, which is used to package the material. Specifically, the discharge pipe 31 can discharge the demagnetized material to the storage tank 4, thereby storing the demagnetized material in the storage tank 4. When it is necessary to package the material, the packaging connection pipe module 41 is opened, allowing the material in the storage tank 4 to enter the packaging machine 42 through the packaging connection pipe module 41, thereby packaging the material using the packaging machine 42. The packaging connection pipe module 41 can also adopt a structure in which the airlock and the pipe are connected. By connecting the airlock between the storage outlet of the storage tank 4 and the pipe, and connecting the pipe between the airlock and the storage tank 4, the airlock can be used to open or close the storage outlet of the storage tank 4, thereby connecting or disconnecting the airlock and the pipe, but this is not a limitation.

[0022] Please see Figures 1 to 3 In one embodiment, the negative pressure-assisted flow fully automatic series-type powder demagnetization system 100 of this utility model further includes a vibration removal device 5 and an impurity discharge pipe 6. The vibration removal device 5 is disposed on the demagnetization pipe 11 and is located in the demagnetization pipe 11 at a position corresponding to the electromagnetic module 12. The impurity discharge pipe 6 is connected to the demagnetization pipe 11 at an incline, and the inclined upper end of the impurity discharge pipe 6 is connected to the demagnetization pipe 11. The vibration removal device 5 drives the demagnetization pipe 11 to vibrate, causing the magnetic impurities adsorbed by the electromagnetic module 12 to fall into the impurity discharge pipe 6. The vibration removal device 5 can adopt an existing vibration motor structure, but is not limited thereto.

[0023] In one embodiment, a T-junction can be installed inside the demagnetizing pipe 11 to facilitate communication between the impurity discharge pipe 6 and the demagnetizing pipe 11. This allows for easy disconnection of the connection between the impurity discharge pipe 6 and the demagnetizing pipe 11 during material removal, and facilitates control of the connection between the impurity discharge pipe 6 and the demagnetizing pipe 11 when impurities need to be discharged, thereby closing the vertical connection of the demagnetizing pipe 11 and allowing impurities to be discharged through the impurity discharge pipe 6. However, this is not a limitation.

[0024] In one embodiment, the negative pressure-assisted fully automatic series-type powder demagnetizing system 100 of this utility model further includes a magnetic sensor (not shown), a camera (not shown), and an electronic control device (not shown). The magnetic sensor, camera, electromagnetic module 12, and negative pressure diversion device 2 are electrically connected to the electronic control device. The magnetic sensor is disposed in the area where the electromagnetic module 12 is arranged within the demagnetizing pipe 11. The magnetic sensor is used to detect the magnetic field strength generated by the electromagnetic module 12 and to feed the detection signal back to the electronic control device. The camera is used to identify magnetic impurities adsorbed by the electromagnetic module 12. The electronic control device is used to control the negative pressure of the negative pressure diversion device 2 and the magnetic field strength of the electromagnetic module 12. By setting up the magnetic sensor, camera, and electronic control device, the demagnetizing effect on the material can be monitored and fed back in real time. The negative pressure of the negative pressure diversion device 2, the magnetic field strength of the electromagnetic module 12 of each demagnetizer 1, or the operating parameters of the series stage can be automatically adjusted according to the demagnetizing effect (e.g., when there are too many impurities in the demagnetizing pipe 11 of a certain stage demagnetizer 1, the magnetic field of that stage is automatically strengthened).

[0025] Please see Figure 1 and Figure 4 In one embodiment, the negative pressure-assisted flow fully automatic series powder demagnetizing system 100 of this utility model further includes a screening machine 7 and a screening pipe connection module 8. The screening machine 7 is used to screen materials and has a screening outlet 71 for screening out target materials. One end of the screening pipe connection module 8 is connected to the screening outlet 71, and the other end of the screening pipe connection module 8 is connected to the inlet 111 of the demagnetizing pipe 11 of the first demagnetizer 1 located in the material conveying direction. The screening pipe connection module 8 includes a first screening pipe 81, a jacketed air supply device 82, and a second screening pipe 83 connected in sequence. The first screening pipe 81 is connected between the screening outlet 71 and the internal channel of the jacketed air supply device 82. The second screening pipe 83 is connected between the internal channel of the jacketed air supply device 82 and the inlet 111 of the demagnetizing pipe 11. The jacketed air supply device 82 is also provided with an air guide 821 that connects its internal channel to the outside. The air guide 821 is used to guide air so that the airflow can enter the internal channel of the jacketed air supply device 82 and then enter the demagnetizing pipe 11 of each demagnetizer 1 along the second screening pipe 83. This allows the material to enter the demagnetizing pipe 11 of each series demagnetizer 1 in sequence under the negative pressure adsorption force of the negative pressure diversion device 2, without relying solely on gravity.

[0026] Specifically, in one embodiment, the diameter of the first screening pipe 81 is smaller than that of the second screening pipe 83, and the internal channel of the jacketed air supply device 82 has a Venturi nozzle structure.

[0027] Furthermore, in one embodiment, the jacketed air supply device 82 is provided with a filter device 822 for filtering impurities at the location of the air guide 821. The filter device 822 filters impurities in the external airflow entering the air guide 821, thus avoiding any impact on the purity of the material.

[0028] Furthermore, in one embodiment, the jacketed air supply device 82 is provided with a vent cap (not shown) or a one-way valve (not shown) at the location of the air inlet 821 to allow external airflow to enter the internal channel of the jacketed air supply device 82 in one direction, thereby preventing material from overflowing when the air pressure fluctuates.

[0029] Combination Figures 1 to 4 The specific working principle of the negative pressure-assisted flow fully automatic series powder demagnetization system 100 of this utility model is as follows: In the production process of negative electrode materials for electric vehicle batteries, the powder to be demagnetized first enters the screening machine 7. The screening machine 7 screens the powder to separate the target material that meets the production requirements. The target material is discharged from the screening outlet 71 of the screening machine 7 and enters the screening pipeline connection module 8. In the screening pipeline connection module 8, the first screening pipeline 81 transports the target material from the screening outlet 71 to the internal channel of the jacket air supply device 82. The air inlet 821 of the jacket air supply device 82 introduces outside air to supplement the airflow in the pipeline, balance the air pressure, and prevent the material from accumulating due to unstable airflow during the transportation process. The filter device 822 at the air inlet 821 filters the incoming outside air to prevent external impurities from mixing into the material. After the airflow is balanced, the material is transported through the second screening pipeline 83 to the inlet of the demagnetization pipeline 11 of the first demagnetizer 1. After the material enters the demagnetization pipe 11 of the first demagnetizer 1, the electromagnetic module 12 inside the demagnetization pipe 11 generates a magnetic field to adsorb strongly magnetic impurities in the material. Simultaneously, a magnetic sensor detects the magnetic field strength of the electromagnetic module 12 in real time and transmits the detection signal to the electronic control device. The electronic control device determines whether the magnetic field strength meets the requirements based on preset parameters. If there is a deviation, it adjusts the magnetic field strength of the electromagnetic module 12 in a timely manner to ensure the adsorption effect of strongly magnetic impurities. A camera captures images of the surface of the electromagnetic module 12 in real time, identifying the quantity and distribution of adsorbed strongly magnetic impurities, and feeds the image information back to the electronic control device. The material that has completed the adsorption of strongly magnetic impurities is transported along the demagnetization pipe 11 to the inlet of the demagnetization pipe 11 of the next demagnetizer 1. The electromagnetic module 12 of the second demagnetizer 1 is set to a suitable magnetic field strength to adsorb residual weakly magnetic impurities in the material. Similarly, a magnetic sensor and a camera monitor the magnetic field strength and identify impurities to ensure effective removal of weakly magnetic impurities.

[0030] During the material conveying process, the negative pressure diversion device 2 located on the last demagnetizer 1 continues to work: the negative pressure source 21 provides negative pressure to the area in the demagnetizing pipe 11 after being adsorbed by the electromagnetic module 12 through the first negative pressure connecting pipe 22, promotes the flow of material in the demagnetizing pipe 11 of each demagnetizer 1, avoids the accumulation of material in the demagnetizing pipe 11 due to magnetic field adsorption, and prevents pipe blockage.

[0031] When the amount of magnetic impurities adsorbed by the electromagnetic module 12 reaches a certain level, the electronic control device controls the vibration removal device 5 to start based on the image information fed back by the camera. The vibration removal device 5 drives the demagnetizing pipe 11 to vibrate, causing the magnetic impurities adsorbed on the surface of the electromagnetic module 12 to fall off. The fallen impurities fall into the inclined impurity discharge pipe 6 and are discharged from the system along the impurity discharge pipe 6, completing the automatic cleaning of impurities without manual intervention and avoiding secondary pollution by impurities. After demagnetization, the material enters the outlet of the demagnetization pipe 11 of the last demagnetizer 1. The discharge airlock 3 opens according to the instruction of the electronic control device, conveying the material to the discharge pipe 31. The discharge pipe 31 conveys the material to the storage tank 4, where the storage tank 4 temporarily stores the demagnetized material. When the material in the storage tank 4 reaches the preset storage amount, the packaging connection pipe module 41 conveys the material in the storage tank 4 to the packaging machine 42. The packaging machine 42 packages the material in a quantitative manner, completing the entire demagnetization and subsequent processing process.

[0032] Throughout the entire system operation, the electronic control device continuously receives feedback signals from the magnetic sensor and camera, monitors the magnetic field strength, impurity adsorption, and material conveying status in real time, and dynamically adjusts the magnetic field strength of the electromagnetic module 12, the negative pressure of the negative pressure diversion device 2, and the on / off status of the discharge airlock 3 and the negative pressure airlock 23 to ensure stable system operation and guarantee the consistency and reliability of the demagnetization effect. In summary, the negative pressure-assisted flow fully automatic series-connected powder demagnetization system 100 of this utility model, through the design of at least two demagnetizers 1 connected in series, can differentiate the electromagnetic modules 12 of each demagnetizer 1 according to the differences in the magnetic properties of impurities. For example, the front-stage demagnetizer 1 adopts a magnetic field strength adapted to strong magnetic impurities, while the rear-stage demagnetizer 1 adopts a magnetic field strength adapted to weak magnetic impurities, forming a gradient demagnetization process. This graded processing mode can specifically capture strong magnetic impurities and weak magnetic impurities, effectively solving the contradiction of "either blockage or residue" in traditional single-stage demagnetization, significantly reducing the residual amount of magnetic impurities in materials, and meeting the production requirements of high-purity materials (such as negative electrode materials for electric vehicle batteries). Meanwhile, the negative pressure-assisted flow fully automatic series-type powder demagnetizing system 100 of this utility model, by setting a negative pressure diversion device 2, uses negative pressure adsorption force to force the material to flow evenly and continuously in the demagnetizing pipe 11 of each demagnetizer 1, ensuring that each particle of powder can fully pass through the magnetic field area of ​​each series-connected demagnetizer 1, completely eliminating the risk of "leakage" caused by material retention and accumulation. Moreover, the negative pressure effect can reduce the electrostatic adsorption and agglomeration of materials with the inner wall of the pipe, avoiding the pipe blockage problem caused by over-adsorption in traditional processes, ensuring the stable operation of the production process, and improving equipment utilization.

[0033] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A negative pressure-assisted flow fully automatic series-type powder demagnetization system, characterized in that, include: A demagnetizer has a demagnetizing pipe for material inlet and outlet. An electromagnetic module is installed inside the demagnetizing pipe. The electromagnetic module is used to adsorb magnetic impurities. The number of demagnetizers is at least two. Each demagnetizer is connected in series along the material conveying direction. The outlet of the demagnetizing pipe of the previous demagnetizer is connected to the inlet of the demagnetizing pipe of the next demagnetizer in the material conveying direction. A negative pressure diversion device is provided, which is installed on the last demagnetizer in the material conveying direction, and one end of the negative pressure diversion device is connected to the position in the demagnetizing pipeline after the electromagnetic module adsorbs magnetic impurities. The negative pressure diversion device is used to provide negative pressure to the demagnetizing pipeline.

2. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 1, characterized in that, It also includes a discharge airlock and a discharge pipe. One end of the discharge airlock is connected to the outlet of the demagnetizing pipe of the last demagnetizer located in the material conveying direction, and the other end of the discharge airlock is connected to one end of the discharge pipe. The discharge airlock is used to open or close the outlet of the demagnetizing pipe, so that the outlet of the demagnetizing pipe is connected to or disconnected from the discharge pipe.

3. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 2, characterized in that, The negative pressure drainage device includes a negative pressure source and a first negative pressure connecting pipe. One end of the first negative pressure connecting pipe is connected to the position in the demagnetizing pipe after the electromagnetic module adsorbs magnetic impurities. The other end of the first negative pressure connecting pipe is connected to the inlet of the negative pressure drainage device.

4. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 3, characterized in that, The negative pressure drainage device further includes a negative pressure shut-off fan and a second negative pressure connecting pipe. One end of the negative pressure shut-off fan is connected to the outlet of the negative pressure source, and the other end of the negative pressure shut-off fan is connected to one end of the second negative pressure connecting pipe. The negative pressure shut-off fan is used to open or close the outlet of the negative pressure source, so that the outlet of the negative pressure source is connected to or disconnected from the second negative pressure connecting pipe. The other end of the second negative pressure connecting pipe is connected to the position between the two ends of the discharge pipe.

5. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 2, characterized in that, It also includes a storage tank, a packaging connection pipe module, and a packaging machine. The storage inlet of the storage tank is connected to the other end of the discharge pipe. The packaging connection pipe module is connected to the storage outlet of the storage tank and the packaging machine. The storage tank is used to store the material after impurity removal. The packaging connection pipe module is used to discharge the material in the storage tank to the packaging machine. The packaging machine is used to package the material.

6. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 1, characterized in that, It also includes a vibration removal device and a discharge pipe. The vibration removal device is installed on the demagnetizing pipe and is located in the demagnetizing pipe at a position corresponding to the electromagnetic module. The discharge pipe is connected to the demagnetizing pipe at an incline, and the upper end of the discharge pipe is connected to the demagnetizing pipe. The vibration removal device drives the demagnetizing pipe to vibrate, so that the magnetic impurities adsorbed by the electromagnetic module fall into the discharge pipe.

7. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 1, characterized in that, It also includes a magnetic sensor, a camera, and an electronic control device. The magnetic sensor, the camera, the electromagnetic module, and the negative pressure drainage device are electrically connected to the electronic control device. The magnetic sensor is disposed in the area where the electromagnetic module is arranged within the demagnetizing pipe. The magnetic sensor is used to detect the magnetic field strength generated by the electromagnetic module and to feed the detection signal back to the electronic control device. The camera is used to identify magnetic impurities adsorbed by the electromagnetic module. The electronic control device is used to control the negative pressure of the negative pressure drainage device and the magnetic field strength of the electromagnetic module.

8. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 1, characterized in that, It also includes a screening machine and a screening pipe connection module. The screening machine is used to screen materials and has a screening outlet for screening out the target material. One end of the screening pipe connection module is connected to the screening outlet, and the other end of the screening pipe connection module is connected to the inlet of the demagnetizing pipe of the first demagnetizer located in the material conveying direction. The screening pipe connection module includes a first screening pipe, a jacketed air supply device, and a second screening pipe connected in sequence. The first screening pipe is connected between the screening outlet and the internal channel of the jacketed air supply device. The second screening pipe is connected between the internal channel of the jacketed air supply device and the inlet of the demagnetizing pipe. The jacketed air supply device is also provided with an air guide port that connects its internal channel to the outside.

9. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 8, characterized in that, The jacketed air supply device is equipped with a filter for filtering impurities at the location of the air inlet.

10. The negative pressure-assisted flow fully automatic series-type powder demagnetization system according to claim 8, characterized in that, The jacketed air supply device is equipped with a vent cap or a one-way valve at the air inlet to allow external airflow to enter the internal channel of the jacketed air supply device in one direction.

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