Airflow screening and demagnetization device for electrode sheet powder processing and screening and demagnetization method thereof

Abstract

The invention relates to the technical field of demagnetization devices, and specifically to an airflow screening demagnetization device for electrode sheet powder processing and a screening demagnetization method thereof. The device comprises a screening cylinder, a top cover is installed at the top of the screening cylinder, and a feed port is arranged on the top cover, an electromagnetic coil is fixedly installed in the screening cylinder, and a switch is arranged on the electromagnetic coil, an inner tube is fixedly installed in the electromagnetic coil, and a magnetic conductive net is movably installed in the inner tube, and a telescopic pipe structure is connected to the feed port; a demagnetization air pipe and a recovery air pipe with a control valve are arranged on the top cover, and the demagnetization air pipe and the recovery air pipe are connected between a transfer pipe and a transition box, a closed slide is connected to the middle of the transition box through a slide groove, and a semi-shield is connected to the closed slide, a ventilation groove is arranged on the transition box, and a ventilation pipe is connected to the ventilation groove, a limiting structure is arranged on the closed slide, and an airflow-driven downward pressure structure is arranged on the electromagnetic coil; the purpose of simplifying the control of the demagnetization machine and efficiently completing the screening and recovery work can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of demagnetization devices, in particular to an airflow screening demagnetization device for electrode sheet powder processing and a screening demagnetization method thereof. Background Art

[0002] my country's new energy vehicle industry is in a stage of rapid development, which has led to a rapid increase in the number of lithium battery recycling. The recycling of highly environmentally friendly and energy-saving lithium materials has become an urgent need for the industry. After the electric vehicles on the consumer side are scrapped, the retired power batteries can be disassembled and sorted, and the waste materials can be recycled and repaired to manufacture new batteries. At present, the positive electrode material of lithium iron phosphate scraps is usually adhered to the aluminum sheet. The positive electrode material powder is generally recycled through the following process: first disassemble the battery, discharge the battery, then saw the battery in the middle, push the battery cell to get the bare battery cell, cut the film on the battery cell with a knife, rewind the material, first take the positive electrode sheet and then the negative electrode sheet; after the above operation, the electrolyte is obtained, and the electrolyte is passed through a low-temperature rotary kiln to obtain a dry electrode sheet. The dry sheet material can be obtained by first obtaining powder or degumming to obtain the positive electrode powder material, and air flow separation is performed to remove aluminum. The powder material after aluminum removal needs to be demagnetized to remove the magnetic powder therein, and then the demagnetized powder material is sent to the rotary kiln for calcination, and then the powder material is subjected to the processes of homogenization, mixing and granulation to form a block material; the obtained block material is calcined in a roller kiln, and then the particle size is controlled by coarse crushing, demagnetization and air flow grinding.

[0003] In the recycling process, demagnetization is one of the important steps, which can reduce the content of metal impurities in the material and effectively improve the performance and safety of the final lithium battery. At present, demagnetization is carried out in an electric demagnetizer. The ferromagnetic particles in the powder are first adsorbed by magnetism to complete the screening work, and then the magnetism is eliminated to recover the ferromagnetic particles. Demagnetizers generally improve the screening efficiency by vibration, so that ferromagnetic particles can be separated from the powder raw materials more quickly. However, due to the existence of dead corners on the screen structure, simple vibration cannot effectively complete the recovery of ferromagnetic particles. At the same time, the simultaneous existence of the screen vibration structure and the electromagnetic structure makes the control system of the demagnetizer more complicated. Summary of the invention

[0004] The purpose of the present invention is to provide an airflow screening and demagnetization device for electrode sheet powder processing and a screening and demagnetization method thereof, so as to simplify the control of the demagnetizer and efficiently complete the screening and recovery work, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an airflow screening and demagnetization device for electrode sheet powder processing, comprising a screening cylinder, the screening cylinder is vertically installed on the device bracket, and the bottom end of the screening cylinder is connected to a double-port material distribution outlet, a top cover is installed on the top of the screening cylinder, and a feed port is arranged on the top cover, an electromagnetic coil is fixedly installed in the screening cylinder, and a push-type switch is arranged on the electromagnetic coil, an inner tube is fixedly installed in the electromagnetic coil, and a magnetic conductive net is movably installed in the inner tube, a telescopic pipe structure is connected to the feed port, and the telescopic pipe structure is composed of an upper pipe, a telescopic joint and a lower pipe, the lower pipe extends into the inner pipe, and the magnetic conductive net is connected to the lower pipe, the upper pipe is connected to the feed port, and an outer ring is arranged on the lower pipe, and the outer ring is connected to the electromagnetic coil through an elastic member; a demagnetization air pipe and a recovery air pipe with a control valve are arranged on the top cover, and the demagnetization air pipe and the recovery air pipe are The air collecting pipe is connected between the transfer pipe and the transition box, the transfer pipe is connected to the air supply device through the air inlet pipe, the middle part of the transition box is connected with a closed slide through a slide groove, and the closed slide is connected with a half shield, the transition box is provided with a ventilation groove, and the ventilation groove is connected with a ventilation pipe, the ventilation pipe is connected to the side of the upper connecting pipe, the connection parts of the demagnetization air pipe and the recovery air pipe with the transition box are respectively located on both sides of the half shield, and the half shield can cover half of the ventilation groove, and the half shield and the closed slide can be moved when air is introduced through the demagnetization air pipe and the recovery air pipe, and a limiting structure is provided on the closed slide, and the on-off state of the switch and the extension limit of the telescopic tube structure can be changed by moving the limiting structure, and an airflow-driven downward pressure structure is provided on the electromagnetic coil, and the downward pressure structure can drive the telescopic tube structure to continuously extend and retract through the airflow in the ventilation pipe, so as to achieve the effect of vibration of the magnetic conductive net.

[0006] Preferably, when air is introduced through the demagnetization air pipe, the closed slide slides to the side of the recovery air pipe, the switch can be opened through the limit structure, and the telescopic tube structure is limited to a state where it can only be extended halfway. When air is introduced through the recovery air pipe, the closed slide slides to the side of the demagnetization air pipe, the limit structure is disengaged from the switch, and the telescopic tube structure is in a state where it can be fully extended.

[0007] Preferably, an outlet control structure is provided in the material distribution outlet to select the material outlet, the feed port and the upper connecting pipe are respectively installed on the upper and lower sides of the top cover, and the expansion joint is connected between the upper connecting pipe and the lower connecting pipe.

[0008] Preferably, the switch is arranged on the top surface of the electromagnetic coil, and the inner tube is located in the inner ring of the electromagnetic coil, an inner bracket is arranged on the top of the magnetic conductive net, and the inner bracket is fixedly installed in the lower pipe, and the elastic member is connected between the outer ring and the top surface of the electromagnetic coil.

[0009] Preferably, the demagnetization air pipe and the recovery air pipe are both arranged through the top cover, and the transfer pipe is located at the top end of the demagnetization air pipe and the recovery air pipe, the transition box is located at the bottom end of the demagnetization air pipe and the recovery air pipe, the slide groove is arranged on the bottom surface of the transition box, and the slide groove can be closed when the closed slide seat slides.

[0010] Preferably, the semi-shield is arranged to completely fit the inner wall of the transition box, dividing the inner cavity of the transition box into two parts which are respectively connected to the demagnetization air pipe and the recovery air pipe, and the ventilation groove is arranged at the center of the transition box.

[0011] Preferably, the limiting structure includes a sliding rod installed at the bottom of the closed sliding seat, and a high pad block and a low pad block are arranged side by side on the sliding rod, the sliding rod is located on the side of the switch, a pressure plate is arranged on the outer ring, and the high pad block and the low pad block are located below the pressure plate, and a limiting block is installed on the bottom surface of the pressure plate, and the high pad block or the low pad block can be adjusted to contact the limiting block when the closed sliding seat moves.

[0012] Preferably, a lower wheel groove is provided in the middle of the ventilation pipe, a rotating shaft is installed in the lower wheel groove, an impeller is provided on the rotating shaft, and the edge of the impeller is located on the air flow channel of the ventilation pipe, and rotating circles are connected to both ends of the rotating shaft.

[0013] Preferably, an arc block is provided in the rotating circle, and a support is fixedly mounted on the electromagnetic coil, a pressure rod is rotatably mounted on the support, and the pressure rod adopts a lever structure, and one end of the long arm of the pressure rod is located in the rotating circle and contacts the arc block, a side plate is installed on the outer ring, and one end of the short arm of the pressure rod contacts the side plate, and balls are arranged on the side plate.

[0014] The screening and demagnetization method for electrode sheet powder processing is applied to an airflow screening and demagnetization device for electrode sheet powder processing. The method comprises the following steps:

[0015] Step S1, powder demagnetization, firstly, air is supplied to the transition box through the demagnetization air pipe, so that the semi-shroud and the closed slide are moved to the side close to the recovery air pipe under the action of air pressure, the limit structure opens the switch of the electromagnetic coil and limits the telescopic degree of the telescopic tube structure, the airflow enters the telescopic tube structure from the ventilation pipe, and the downward pressure structure is used to drive the telescopic tube structure to continuously extend and retract, so that the magnetic conductive net vibrates slightly along with the lower pipe, and the magnetic field formed by the electromagnetic coil makes the magnetic conductive net generate strong magnetism, and the electrode sheet powder is fed into the telescopic tube structure from the feed port, and then enters the inner tube from the telescopic tube structure, and the ferromagnetic particles are separated by the magnetic conductive net, and the screening is assisted by airflow and vibration, and the powder without ferromagnetic particles is collected from one of the outlets of the material distribution outlet;

[0016] Step S2, ferromagnetic particles are recovered. Air is supplied to the transition box through the recovery air pipe, so that the closed slide moves to the side close to the demagnetization air pipe under the action of air pressure, the limit structure is disengaged from the switch, the electromagnetic coil is powered off, and at the same time, the limit structure no longer limits the telescopic degree of the telescopic tube structure. The airflow enters the telescopic tube structure from the ventilation pipe, and the downward pressure structure drives the telescopic tube structure to continuously expand and contract. The magnetic conductive net vibrates greatly along with the lower connecting pipe. The airflow and vibration cause the ferromagnetic particles on the magnetic conductive net to fall off and are recovered from the other outlet of the material distribution outlet.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The demagnetization device of the present invention can first screen out the ferromagnetic particles in the electrode sheet powder material, and then recover the ferromagnetic particles. Different degrees of vibration and air pressure are used to assist in the screening and recovery process, and the entire demagnetization work is completed efficiently. In addition, the vibration time and amplitude of the magnetic conductive net are synchronously controlled by the airflow screening structure, making the control system of the demagnetization device simpler.

[0019] 2. In addition to vibrating the magnetic conductive net to improve screening efficiency, the demagnetization device of the present invention also performs auxiliary screening through airflow. Through the action of airflow, the powder separation efficiency can be improved during screening, and the particle recovery efficiency can be improved during recovery. The airflow supply structure has a control function and a driving function. By adjusting the direction and pressure of the air supply, it can control whether a magnetic field is formed in the device and change the vibration amplitude of the magnetic conductive net. The overall control of the demagnetization device can be completed through air supply control.

[0020] 3. The present invention uses the air pressure generated by the air flow as a driving force to drive the telescopic tube structure to expand and contract and the magnetic conductive net to vibrate. When the air flow passes through the ventilation pipe, the force is amplified by the downward pressure structure, and the pressure is transmitted to the outer ring and the lower connecting pipe. The telescopic tube structure is continuously expanded and contracted, and the magnetic conductive net vibrates to help complete the separation and screening work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the screening and demagnetization device of the present invention.

[0023] Figure 3 It is a schematic diagram of the screening cylinder structure of the present invention.

[0024] Figure 4 It is a schematic diagram of the telescopic tube and catheter structure of the present invention.

[0025] Figure 5 It is a schematic diagram of the magnetic conductive network structure of the present invention.

[0026] Figure 6 It is a schematic diagram of the top cover and the structure thereon of the present invention.

[0027] Figure 7 It is a schematic diagram of the position of the electromagnetic coil and the pressing structure of the present invention.

[0028] Figure 8 It is a schematic diagram of the pressing structure of the present invention.

[0029] Fig. 9 It is an internal schematic diagram of the transition box structure of the present invention.

[0030] Fig.10 It is a first schematic diagram of the pressure plate and its downward pressing structure of the present invention.

[0031] Fig.11 This is a second schematic diagram of the pressure plate and its downward pressing structure of the present invention.

[0032] In the figure: 1. device bracket; 2. screening cylinder; 3. material distribution outlet; 4. top cover; 5. material feed port; 6. electromagnetic coil; 7. switch; 8. inner tube; 9. inner bracket; 10. magnetic conductive net; 11. upper connecting pipe; 12. expansion joint; 13. lower connecting pipe; 14. outer ring; 15. elastic part; 16. demagnetization air pipe; 17. recovery air pipe; 18. transfer pipe; 19. air inlet pipe; 20. transition box; 21. closed slide seat; 22. half shield; 23. ventilation groove; 24. ventilation pipe; 25. slide bar; 26. high pad; 27. low pad; 28. pressure plate; 29. ​​limit block; 30. lower wheel groove; 31. rotating shaft; 32. impeller; 33. rotating circle; 34. arc block; 35. support; 36. pressure rod; 37. side plate; 38. ball bearing. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 11The present invention provides a technical solution: an airflow screening and demagnetizing device for electrode sheet powder processing, comprising a screening cylinder 2, the screening cylinder 2 is vertically mounted on a device bracket 1, and the bottom end of the screening cylinder 2 is connected to a double-port material distribution outlet 3, the top of the screening cylinder 2 is mounted with a top cover 4, and the top cover 4 is provided with a feed port 5, an electromagnetic coil 6 is fixedly mounted in the screening cylinder 2, and a push-type switch 7 is provided on the electromagnetic coil 6, an inner tube 8 is fixedly mounted in the electromagnetic coil 6, and a magnetic conductive material is movably mounted in the inner tube 8 The net 10 is connected to the feed port 5 with a telescopic pipe structure, and the telescopic pipe structure is composed of an upper pipe 11, a telescopic joint 12 and a lower pipe 13, the lower pipe 13 extends into the inner tube 8, and the magnetic conductive net 10 is connected to the lower pipe 13, the upper pipe 11 is connected to the feed port 5, and the lower pipe 13 is provided with an outer ring 14, and the outer ring 14 is connected to the electromagnetic coil 6 through an elastic member 15; the top cover 4 is provided with a demagnetization air pipe 16 with a control valve and a recovery air pipe 17, and the demagnetization air pipe 16 and the recovery air pipe 17 are connected Between the transfer pipe 18 and the transition box 20, the transfer pipe 18 is externally connected to the air supply device through the air inlet pipe 19, the middle of the transition box 20 is connected to a closed slide seat 21 through a slide groove, and the closed slide seat 21 is connected to a semi-shield 22, the transition box 20 is provided with a ventilation groove 23, and the ventilation groove 23 is connected to a ventilation pipe 24, the ventilation pipe 24 is connected to the side of the upper pipe 11, except that the connection between the magnetic air pipe 16 and the recovery air pipe 17 and the transition box 20 is respectively located on both sides of the semi-shield 22, and the semi-shield 22 It can block half of the ventilation groove 23, and when air is introduced through the demagnetization air pipe 16 and the recovery air pipe 17, the half shield 22 and the closed slide 21 can be moved. A limit structure is arranged on the closed slide 21, and the movement of the limit structure can adjust the on-off state of the switch 7 and change the extension limit of the telescopic tube structure. The electromagnetic coil 6 is provided with an airflow-driven downward pressure structure, and the downward pressure structure can drive the telescopic tube structure to continuously extend and retract through the airflow in the ventilation pipe 24, so as to achieve the effect of vibration of the magnetic conductive net 10. When air is introduced through the demagnetization air pipe 16, the closed slide 21 slides to the side of the recovery air pipe 17, and the switch 7 can be opened through the limit structure, and the telescopic tube structure can be limited to a state where it can only be extended by half. When air is introduced through the recovery air pipe 17, the closed slide 21 slides to the side of the demagnetization air pipe 16, and the limit structure is separated from the switch 7, and the telescopic tube structure is in a state where it can be fully extended.

[0035] The demagnetization device of the present invention can first screen out the ferromagnetic particles in the electrode sheet powder material, and then recover the ferromagnetic particles. Different degrees of vibration and air pressure are used to assist in the screening and recovery process, and the entire demagnetization work is completed efficiently. In addition, the vibration time and amplitude of the magnetic conductive net 10 are synchronously controlled by the airflow screening structure, making the control system of the demagnetization device simpler.

[0036] like Figure 1-Figure 4As shown, an outlet control structure is provided in the material distribution outlet 3, which can select the material outlet, the feed port 5 and the upper connecting pipe 11 are respectively installed on the upper and lower sides of the top cover 4, and the expansion joint 12 is connected between the upper connecting pipe 11 and the lower connecting pipe 13.

[0037] The positive electrode sheet powder material is added into the device from the feed port 5 of the top cover 4, then enters the telescopic tube structure and the inner tube 8, passes through the magnetic conductive net 10 located in the inner tube 8, and then flows out of the device from the distribution outlet 3. The distribution outlet 3 has two outlets, which can be opened separately to discharge the demagnetized powder material and the ferromagnetic particles. At the same time, the telescopic tube structure is a structure with a fixed upper end and a movable lower end. When the lower end moves up and down, it can drive the magnetic conductive net 10 thereon to vibrate. When the amplitude is small, it is used to improve the screening efficiency of the powder material, and when the amplitude is large, it is used to increase the separation speed of the ferromagnetic particles.

[0038] like Figure 4 , Figure 5 As shown, the switch 7 is arranged on the top surface of the electromagnetic coil 6, and the inner tube 8 is located in the inner ring of the electromagnetic coil 6, an inner bracket 9 is arranged on the top of the magnetic conductive net 10, and the inner bracket 9 is fixedly installed in the lower pipe 13, and the elastic member 15 is connected between the outer ring 14 and the top surface of the electromagnetic coil 6.

[0039] The lower connecting pipe 13 of the telescopic tube structure is connected to the electromagnetic coil 6 through the elastic member 15, which limits the vibration of the lower connecting pipe 13, so that the magnetic conductive net 10 can stably vibrate up and down in the inner tube 8. If the electromagnetic coil 6 is energized to generate a magnetic field, the magnetic field forms a high-density magnetic field in the magnetic cavity through the magnetic conductive circuit, and the magnetic conductive net 10 will be magnetized to adsorb ferromagnetic particles, so that the electrode sheet powder falls and is separated. When the electromagnetic coil 6 is powered off, the magnetism of the magnetic conductive net 10 disappears, and the ferromagnetic particles adsorbed thereon can fall for recovery.

[0040] like Figure 6-Figure 9 As shown, the demagnetization air pipe 16 and the recovery air pipe 17 are both arranged through the top cover 4, and the transfer pipe 18 is located at the top of the demagnetization air pipe 16 and the recovery air pipe 17, the transition box 20 is located at the bottom of the demagnetization air pipe 16 and the recovery air pipe 17, the slide groove is arranged on the bottom surface of the transition box 20, and the closing slide seat 21 can close the slide groove when sliding. The semi-shroud 22 is arranged to completely fit the inner wall of the transition box 20, and the inner cavity of the transition box 20 is divided into two parts, which are respectively connected to the demagnetization air pipe 16 and the recovery air pipe 17, and the ventilation groove 23 is arranged at the center of the transition box 20.

[0041] In addition to vibrating the magnetic conductive net 10 to improve the screening efficiency, the demagnetization device of the present invention also performs auxiliary screening through airflow. Through the action of the airflow, the powder separation efficiency can be improved during screening, and the particle recovery efficiency can be improved during recovery. In addition, the airflow supply structure of the present invention has a control function and a driving function. By adjusting the direction and pressure of the air supply, it can control whether a magnetic field is formed in the device and change the vibration amplitude of the magnetic conductive net 10. That is, the overall control of the demagnetization device can be completed through air supply control.

[0042] When demagnetization is performed, the airflow enters from the demagnetization air pipe 16, which can push the half shield 22 and the closed slide 21 in the transition box 20 to the other side, and then the airflow enters the air pipe 24 from the half of the ventilation groove 23 close to the demagnetization air pipe 16, and finally enters the telescopic tube structure to guide the electrode sheet powder material to fall and separate. Conversely, when the ferromagnetic particles are recovered, the airflow enters from the recovery air pipe 17, pushing the half shield 22 and the closed slide 21 in the opposite direction, so that the airflow enters the air pipe 24 and the telescopic tube structure from the other half of the ventilation groove 23 to guide the ferromagnetic particles downward.

[0043] like Fig. 9 As shown, the limiting structure includes a slide bar 25 installed at the bottom of the closed slide 21, and a high pad 26 and a low pad 27 are arranged side by side on the slide bar 25, the slide bar 25 is located on the side of the switch 7, a pressure plate 28 is arranged on the outer ring 14, and the high pad 26 and the low pad 27 are located below the pressure plate 28, and a limiting block 29 is installed on the bottom surface of the pressure plate 28, and when the closed slide 21 moves, the high pad 26 or the low pad 27 can be adjusted to contact the limiting block 29.

[0044] The movement of the closed slide 21 can determine whether the electromagnetic coil 6 is energized, and can also determine the vibration amplitude of the magnetic conductive net 10. When air is introduced through the demagnetizing air pipe 16, the slide bar 25 moves with the closed slide 21, and the slide bar 25 can press the switch 7 to keep it in the open state. At this time, the electromagnetic coil 6 can generate a magnetic field. At the same time, the high pad 26 is moved to the bottom of the limit block 29. Therefore, the descending height of the pressure plate 28 and the outer ring 14 is limited by the high pad 26, and the elongation of the telescopic tube structure is limited to half the height. The magnetic conductive net 10 can only vibrate slightly, which prevents ferromagnetic particles from mixing into the powder material under severe vibration. When air is introduced through the recovery air pipe 17, the slide bar 25 is disengaged from the switch 7, and the electromagnetic coil 6 is de-energized. At the same time, the low pad 27 on the slide bar 25 moves to the bottom of the limit block 29. The descending height of the pressure plate 28 and the outer ring 14 is limited by the low pad 27. The magnetic conductive net 10 can vibrate more significantly, accelerating the recovery of ferromagnetic particles thereon.

[0045] like Figure 10-11As shown, a lower wheel groove 30 is provided in the middle of the vent pipe 24, and a rotating shaft 31 is installed in the lower wheel groove 30, and an impeller 32 is provided on the rotating shaft 31, and the edge of the impeller 32 is located on the air flow channel of the vent pipe 24, and a rotating circle 33 is connected to both ends of the rotating shaft 31. An arc block 34 is provided in the rotating circle 33, and a support 35 is fixedly installed on the electromagnetic coil 6, and a pressure rod 36 is rotatably installed on the support 35, and the pressure rod 36 adopts a lever structure, and one end of the long arm of the pressure rod 36 is located in the rotating circle 33 and contacts the arc block 34, and a side plate 37 is installed on the outer ring 14, and one end of the short arm of the pressure rod 36 contacts the side plate 37, and balls 38 are arranged on the side plate 37.

[0046] The present invention also uses the air pressure generated by the air flow as a driving force to drive the telescopic tube structure to expand and contract and the magnetic conductive net 10 to vibrate. When the air flow passes through the ventilation pipe 24, it can act on the impeller 32, so that the rotating shaft 31 drives the rotating circle 33 to rotate continuously. The rotating circle 33 is provided with an arc block 34 with an arc surface to push the pressure rod 36 continuously. Since the pressure rod 36 is in the form of a lever, it can amplify the pressure and intermittently press down the side plate 37, so that the pressure is transmitted to the outer ring 14 and the lower connecting pipe 13. The telescopic tube structure is continuously expanded and contracted, and the magnetic conductive net 10 vibrates. The ball 38 provided on the side plate 37 can reduce the pressure loss caused by friction.

[0047] The screening and demagnetization method for electrode sheet powder processing is applied to an airflow screening and demagnetization device for electrode sheet powder processing. The method comprises the following steps:

[0048] Step S1, powder demagnetization, firstly, air is supplied to the transition box 20 through the demagnetization air pipe 16, so that the semi-shroud 22 and the closed slide 21 move to the side close to the recovery air pipe 17 under the action of air pressure, and the limit structure opens the switch 7 of the electromagnetic coil 6 and limits the telescopic degree of the telescopic tube structure. The airflow enters the telescopic tube structure from the ventilation pipe 24, and the telescopic tube structure is driven to continuously expand and contract by the downward pressure structure, so that the magnetic conductive net 10 vibrates slightly with the lower connecting pipe 13. The magnetic field formed by the electromagnetic coil 6 makes the magnetic conductive net 10 generate strong magnetism, and the electrode sheet powder is sent into the telescopic tube structure from the feed port 5, and then enters the inner tube 8 from the telescopic tube structure, and the ferromagnetic particles are separated by the magnetic conductive net 10, and the airflow passes through the inner tube 8. The powder with the assistance of vibration is screened, and the powder with the ferromagnetic particles removed is collected from one of the outlets of the material distribution outlet 3; step S2, the ferromagnetic particles are recovered, and air is supplied to the transition box 20 through the recovery air pipe 17, so that the closed slide 21 moves to the side close to the demagnetization air pipe 16 under the action of air pressure, and the limit structure is disengaged from the switch 7, the electromagnetic coil 6 is powered off, and at the same time, the limit structure no longer limits the telescopic degree of the telescopic tube structure, and the airflow enters the telescopic tube structure from the ventilation pipe 24. The downward pressure structure drives the telescopic tube structure to continuously expand and contract, and the magnetic conductive net 10 vibrates greatly with the lower connecting pipe 13. The airflow and vibration cause the ferromagnetic particles on the magnetic conductive net 10 to fall off and be recovered from the other outlet of the material distribution outlet 3.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An airflow screening and demagnetizing device for electrode sheet powder processing, comprising a screening cylinder (2), characterized in that: The screening cylinder (2) is vertically mounted on the device support (1), and the bottom end of the screening cylinder (2) is connected to a double-opening material distribution outlet (3), the top end of the screening cylinder (2) is mounted with a top cover (4), and the top cover (4) is provided with a feed inlet (5), an electromagnetic coil (6) is fixedly mounted inside the screening cylinder (2), and a push-type switch (7) is provided on the electromagnetic coil (6), an inner tube (8) is fixedly mounted inside the electromagnetic coil (6), and a movably mounted inner tube (8) is provided. A magnetic conductive net (10), wherein the feed port (5) is connected to a telescopic tube structure, and the telescopic tube structure is composed of an upper tube (11), a telescopic joint (12) and a lower tube (13), wherein the lower tube (13) extends into the inner tube (8), and the magnetic conductive net (10) is connected to the lower tube (13), wherein the upper tube (11) is connected to the feed port (5), and an outer ring (14) is provided on the lower tube (13), and the outer ring (14) is connected to the electromagnetic coil (6) via an elastic member (15); The top cover (4) is provided with a demagnetization air pipe (16) and a recovery air pipe (17) with a control valve, and the demagnetization air pipe (16) and the recovery air pipe (17) are connected between the transfer pipe (18) and the transition box (20), the transfer pipe (18) is externally connected to the air supply device through the air inlet pipe (19), the middle of the transition box (20) is connected to a closed slide seat (21) through a slide groove, and the closed slide seat (21) is connected to a semi-shield (22), the transition box (20) is provided with a ventilation groove (23), and the ventilation groove (23) is connected to a ventilation pipe (24), the ventilation pipe (24) is connected to the side of the upper pipe (11), the demagnetization air pipe (16) and the recovery air pipe The connection points between (17) and the transition box (20) are respectively located on both sides of the semi-shield (22), and the semi-shield (22) can cover half of the ventilation groove (23). When air is taken in through the demagnetization air pipe (16) and the recovery air pipe (17), the semi-shield (22) and the closed slide (21) can move. A limit structure is arranged on the closed slide (21). The on-off state of the switch (7) and the extension limit of the telescopic tube structure can be adjusted by moving the limit structure. The electromagnetic coil (6) is provided with an airflow-driven downward pressure structure, and the downward pressure structure can drive the telescopic tube structure to continuously extend and retract through the airflow in the ventilation pipe (24), thereby achieving the effect of vibrating the magnetic conductive net (10).

2. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 1, characterized in that: When air is introduced through the demagnetization air pipe (16), the closed slide seat (21) slides toward the side of the recovery air pipe (17), the switch (7) can be opened through the limiting structure, and the telescopic tube structure is limited to a state where it can only be extended halfway. When air is introduced through the recovery air pipe (17), the closed slide seat (21) slides toward the side of the demagnetization air pipe (16), the limiting structure is separated from the switch (7), and the telescopic tube structure is in a state where it can be fully extended.

3. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 1, characterized in that: The material distribution outlet (3) is provided with an outlet control structure capable of selecting a material outlet, the feed inlet (5) and the upper pipe (11) are respectively mounted on the upper and lower sides of the top cover (4), and the expansion joint (12) is connected between the upper pipe (11) and the lower pipe (13).

4. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 1, characterized in that: The switch (7) is arranged on the top surface of the electromagnetic coil (6), and the inner tube (8) is located in the inner ring of the electromagnetic coil (6). An inner bracket (9) is arranged on the top of the magnetic conductive net (10), and the inner bracket (9) is fixedly installed in the lower pipe (13). The elastic member (15) is connected between the outer ring (14) and the top surface of the electromagnetic coil (6).

5. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 1, characterized in that: The demagnetization air pipe (16) and the recovery air pipe (17) are both arranged to penetrate the top cover (4), and the transfer pipe (18) is located at the top of the demagnetization air pipe (16) and the recovery air pipe (17). The transition box (20) is located at the bottom of the demagnetization air pipe (16) and the recovery air pipe (17). The slide groove is arranged on the bottom surface of the transition box (20), and the closing slide seat (21) can close the slide groove when sliding.

6. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 1, characterized in that: The semi-shield (22) is arranged to completely fit the inner wall of the transition box (20), dividing the inner cavity of the transition box (20) into two parts, which are respectively connected to the demagnetization air pipe (16) and the recovery air pipe (17), and the ventilation groove (23) is arranged at the center of the transition box (20).

7. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 1, characterized in that: The limiting structure comprises a slide bar (25) mounted at the bottom of the closed slide seat (21), and a high pad (26) and a low pad (27) are arranged side by side on the slide bar (25), the slide bar (25) is located on the side of the switch (7), a pressure plate (28) is arranged on the outer ring (14), and the high pad (26) and the low pad (27) are located below the pressure plate (28), and a limiting block (29) is installed on the bottom surface of the pressure plate (28), and when the closed slide seat (21) moves, the high pad (26) or the low pad (27) can be adjusted to contact the limiting block (29).

8. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 1, characterized in that: A lower wheel groove (30) is provided in the middle of the ventilation pipe (24), a rotating shaft (31) is installed in the lower wheel groove (30), an impeller (32) is provided on the rotating shaft (31), and the edge of the impeller (32) is located on the air flow channel of the ventilation pipe (24), and both ends of the rotating shaft (31) are connected to rotating circles (33).

9. The airflow screening and demagnetization device for electrode sheet powder processing according to claim 8, characterized in that: An arc surface block (34) is arranged in the rotating circle (33), and a support (35) is fixedly mounted on the electromagnetic coil (6). A pressure rod (36) is rotatably mounted on the support (35), and the pressure rod (36) adopts a lever structure, and one end of the long arm of the pressure rod (36) is located in the rotating circle (33) and contacts the arc surface block (34). A side plate (37) is installed on the outer ring (14), and one end of the short arm of the pressure rod (36) contacts the side plate (37), and balls (38) are arranged on the side plate (37).

10. A screening and demagnetizing method for electrode sheet powder processing, applied to the airflow screening and demagnetizing device for electrode sheet powder processing as claimed in claim 1, characterized in that: The method comprises the following steps: Step S1, powder demagnetization, firstly, air is supplied to the transition box (20) through the demagnetization air pipe (16), so that the semi-shroud (22) and the closed slide seat (21) move to the side close to the recovery air pipe (17) under the action of air pressure, the limit structure opens the switch (7) of the electromagnetic coil (6) and limits the telescopic degree of the telescopic tube structure, the airflow enters the telescopic tube structure from the ventilation pipe (24), and the telescopic tube structure is driven to continuously telescope by the downward pressure structure, so that the magnetic conductive net (10) vibrates slightly along with the lower pipe (13), and the magnetic field formed by the electromagnetic coil (6) causes the magnetic conductive net (10) to generate strong magnetism, so that the electrode sheet powder is fed into the telescopic tube structure from the feed port (5), and then enters the inner tube (8) from the telescopic tube structure, and the ferromagnetic particles are separated by the magnetic conductive net (10), and the powder is screened by airflow and vibration assistance, and the powder with the ferromagnetic particles removed is collected from one of the outlets of the material distribution outlet (3); Step S2, ferromagnetic particles are recovered. Air is supplied to the transition box (20) through the recovery air pipe (17), so that the closed slide (21) moves to the side close to the demagnetization air pipe (16) under the action of air pressure, the limit structure is disengaged from the switch (7), the electromagnetic coil (6) is powered off, and at the same time, the limit structure no longer limits the telescopic degree of the telescopic tube structure. The airflow enters the telescopic tube structure from the ventilation pipe (24), and the downward pressure structure drives the telescopic tube structure to continuously expand and contract. The magnetic conductive net (10) vibrates greatly along with the lower connecting pipe (13). The airflow and vibration cause the ferromagnetic particles on the magnetic conductive net (10) to fall off and be recovered from another outlet of the material distribution outlet (3).

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