A waste lithium battery processing device

Abstract

The present invention relates to the field of battery processing technology, and specifically to a waste lithium battery processing device, comprising a housing, a metal extraction mechanism, a driving mechanism, a metal storage mechanism, and a pressurizing mechanism, wherein the bottom outer wall of the housing is fixedly connected to a collection tank, the bottom outer wall of the collection tank is fixedly connected to a driving motor, the outer wall of a connecting plate is fixedly connected to a filter frame, and the outer walls of both sides of the filter frame are slidably connected to symmetrically distributed side plates. The present invention promotes electrolyte separation through a pressurizing mechanism, and the electromagnetic frame moves upward along the limit frame through linkage with the ratchet assembly through the pressure plate. The electromagnetic frame moves upward and disperses the fragments, adsorbing metal. When the electromagnetic frame moves horizontally at the top of the limit frame, the side plates gather the adsorbed metal to the end, and the receiving plate opens to receive the metal material, and the metal material falls into the storage box. The periodic movement of the electromagnetic frame enhances the metal collection effect while promoting the separation of the electrolyte, avoiding the adsorption dead corner caused by the accumulation of debris, and realizing the efficient separation and recovery of the electrolyte and metal in the battery fragments.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing, and in particular to a waste lithium battery processing device. Background Art

[0002] Lithium battery recycling refers to the collection, processing, and resource reuse of discarded lithium-ion batteries (including those found in mobile phones, laptops, electric vehicles, and energy storage systems). With the surge in global demand for lithium batteries, recycling not only reduces environmental pollution but also alleviates the supply pressure of raw materials (such as lithium, cobalt, and nickel) and promotes the development of a circular economy. Lithium batteries contain heavy metals (cobalt and nickel) and toxic electrolytes. Improper disposal can contaminate soil and water sources, and the organic solvents in the electrolyte can cause fires or release harmful gases.

[0003] The patent with authorization announcement number: CN114899518B discloses an efficient processing and recovery device for the electrolyte of lead-acid batteries of electric vehicles, including an inclined tube, a battery crushing device is provided inside the upper end of the inclined tube, a plurality of first filter holes are opened on the lower side wall of the inclined tube, an electrolyte collection box is installed on the lower side of the inclined tube, all the first filter holes are connected to the electrolyte collection box, and an exhaust assembly and a spray assembly are installed in sequence from top to bottom on the inner upper side wall of the inclined tube. The exhaust assembly is located on the upper side of the first filter hole, and the spray assembly is staggered with the first filter hole. The lower end pipe mouth of the inclined tube is connected and connected to a cleaning box, and a cleaning assembly is installed in the cleaning box.

[0004] However, the above invention still has some shortcomings in actual use: 1. The electrolyte in the battery fragments relies on gravity to flow into the electrolyte collection box through the first filter hole, and the battery fragments generated after crushing slide downward along the inclined tube. During the sliding process, the residual electrolyte on the battery also enters the electrolyte collection box. In this way, only gravity is relied upon to naturally infiltrate the electrolyte through the filter hole. The battery fragments move slowly along the inclined slide. During the movement, only inertia can be relied upon to separate the electrolyte attached to the surface. The collection efficiency is low and the residual amount is large, resulting in incomplete separation; 2. There are some metals that can be reused remaining in the battery fragments. The above patent only separates the electrolyte from the battery fragments, and cannot simultaneously separate the effective metals during the separation process, resulting in waste of resources. The metals require additional steps to be extracted, which increases the processing cost. Therefore, a waste lithium battery processing device is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a waste lithium battery processing device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A waste lithium battery processing device includes a housing, a collection tank is fixedly connected to the bottom outer wall of the housing, a drive motor is fixedly connected to the bottom outer wall of the collection tank, an output shaft of the drive motor is fixedly connected to a mounting column, the mounting column is rotatably connected to the collection tank, the outer wall of the mounting column is fixedly connected to a central connecting frame, the outer wall of the central connecting frame is fixedly connected to the mounting frame, the end of the mounting frame is hingedly connected to a connecting plate 1 via a hinge shaft, the outer wall of the connecting plate 1 is fixedly connected to a filter frame, and the outer walls of both sides of the filter frame are slidably connected to symmetrically distributed side plates, and further includes:

[0008] The metal extraction mechanism includes an electromagnetic frame, which is slidably connected to the side plate. The outer wall of the electromagnetic frame is fixedly connected to a connecting shaft rod. The outer wall of the connecting shaft rod is rotatably connected to a connecting slide. The outer wall of the connecting slide is slidably connected to an external connecting plate. The inner wall of the external connecting plate is fixedly connected to a first shaft rod. Both ends of the first shaft rod are rotatably connected to a limit frame. Both limit frames are fixedly connected to the filter frame via double-sided connecting rods.

[0009] One end of the first shaft is fixedly connected to a driving mechanism, including a ratchet assembly and a first gear, the ratchet assembly is fixedly connected to the end of the first shaft, and the first gear is rotatably connected to the ratchet assembly through the shaft;

[0010] The inner walls of the side panels are each provided with a metal storage mechanism, including a receiving plate, the receiving plate being rotatably connected to the side panel via a second shaft, and an opening and closing gear being fixed to the end of the second shaft;

[0011] and three pressurizing mechanisms, which are fixedly connected to the inner wall of the shell.

[0012] Preferably, a limiting groove is provided on the outer wall of the collection tank, the end of the hinged shaft is fixedly connected to a transmission gear, the outer wall of the transmission gear is meshed with a rack plate, the rack plate is slidably connected to the mounting frame, the outer wall of the rack plate is fixedly connected to a sliding shaft rod, and the sliding shaft rod is slidably connected to the collection tank through the limiting groove.

[0013] Preferably, the pressurizing mechanism includes a hydraulic cylinder and a pressure plate, the hydraulic cylinder is fixedly connected to the inner wall of the shell, and the pressure plate is fixedly connected to the end of the hydraulic cylinder.

[0014] Preferably, the outer wall of the pressure plate is fixedly connected to a connecting frame 1, and both sides of the connecting frame 1 are fixedly connected to symmetrically distributed first rack rods, and the first rack rods are meshed with the outer wall of the first gear.

[0015] Preferably, two evenly distributed springs are fixedly connected between the outer connecting plate and the connecting slide plate.

[0016] Preferably, a storage box is fixedly connected to the outer wall of the side plate, and the storage box is at the same height as the receiving plate. The outer walls on both sides of the filter frame are fixedly connected to a gear block group.

[0017] Preferably, an interference rod is fixedly connected to the outer wall of the filter frame.

[0018] Preferably, the outer wall of the central connecting frame is provided with four mounting frames, which are distributed in a circular array. Metal extraction mechanisms are provided on both sides of each filter frame, and every two adjacent electromagnetic frames are staggered.

[0019] Compared with the existing technology, the present invention has the following beneficial effects:

[0020] The present invention promotes electrolyte separation through a pressurizing mechanism, and the electromagnetic frame moves upward along the limit frame through the linkage of the pressure plate and the ratchet assembly. The electromagnetic frame moves upward and scatters the fragments and adsorbs the metal. When the electromagnetic frame moves laterally on the top of the limit frame, the side plate gathers the adsorbed metal to the end, and the receiving plate opens to receive the metal material, and the metal material falls into the storage box. The periodic movement of the electromagnetic frame enhances the metal collection effect while promoting the separation of the electrolyte, avoiding the adsorption dead corner caused by the accumulation of debris, and realizing the efficient separation and recovery of the electrolyte and metal in the battery fragments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the present invention after removing part of the outer shell;

[0023] Figure 3 This invention Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0024] Figure 4 This invention Figure 2 A schematic diagram of the partially enlarged structure at point B in the middle;

[0025] Figure 5 It is a structural diagram of the filter frame of the present invention;

[0026] Figure 6 This invention Figure 5 A schematic diagram of the partially enlarged structure at point C in the middle;

[0027] Figure 7 This is a schematic diagram of the internal structure of the external connection plate of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the sliding shaft of the present invention;

[0029] Figure 9 This invention Figure 8 The schematic diagram of the local enlarged structure at D in the middle;

[0030] Figure 10 This invention Figure 8 Schematic diagram of the local enlarged structure at E in the middle;

[0031] Figure 11 It is a structural schematic diagram of the positional relationship between the side panels and the receiving panels of the present invention.

[0032] In the figure: 1, housing; 2, collecting tank; 3, driving motor; 4, mounting column; 5, filter frame; 6, center connecting frame; 7, side plate; 8, pressure plate; 9, hydraulic cylinder; 10, limit slide; 11, connecting frame 1; 12, first rack rod; 13, interference rod; 14, gear block assembly; 15, electromagnetic frame; 16, connecting slide; 17, storage box; 18, outer connecting plate; 19, first shaft rod; 20, limit frame; 21, First gear; 22. Ratchet assembly; 23. Spring; 24. Connecting shaft; 25. Mounting frame; 26. Articulated shaft; 27. Connecting plate 1; 28. Sliding shaft; 29. ​​Rack plate; 30. Transmission gear; 31. Attachment plate; 32. Double-sided connecting rod; 33. Opening and closing gear; 34. Second shaft; 101. Pressurizing mechanism; 202. Metal extraction mechanism; 303. Driving mechanism; 404. Metal storage mechanism. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] Reference Figures 1-11 A waste lithium battery processing device includes a housing 1, a collection tank 2 is fixedly connected to the bottom outer wall of the housing 1, a drive motor 3 is fixedly connected to the bottom outer wall of the collection tank 2, an output shaft of the drive motor 3 is fixedly connected to a mounting column 4, the mounting column 4 is rotatably connected to the collection tank 2, an outer wall of the mounting column 4 is fixedly connected to a central connecting frame 6, an outer wall of the central connecting frame 6 is fixedly connected to a mounting frame 25, an end of the mounting frame 25 is hingedly connected to a connecting plate 27 via a hinge shaft 26, an outer wall of the connecting plate 27 is fixedly connected to a filter frame 5, and the outer walls of both sides of the filter frame 5 are slidably connected to symmetrically distributed side panels 7, and further includes:

[0036] The metal extraction mechanism 202 includes an electromagnetic frame 15, which is slidably connected to the side plate 7. The outer wall of the electromagnetic frame 15 is fixedly connected to a connecting shaft 24. The outer wall of the connecting shaft 24 is rotatably connected to a connecting slide 16. The outer wall of the connecting slide 16 is slidably connected to an outer connecting plate 18. The inner wall of the outer connecting plate 18 is fixedly connected to a first shaft 19. Both ends of the first shaft 19 are rotatably connected to limit frames 20. Both limit frames 20 are fixedly connected to the filter frame 5 via bilateral connecting rods 32.

[0037] One end of the first shaft 19 is fixedly connected to a driving mechanism 303, which includes a ratchet assembly 22 and a first gear 21. The ratchet assembly 22 is fixedly connected to the end of the first shaft 19, and the first gear 21 is rotatably connected to the ratchet assembly 22 through the shaft;

[0038] The inner wall of each side plate 7 is provided with a metal storage mechanism 404, including a receiving plate 31, the receiving plate 31 is rotatably connected to the side plate 7 via a second shaft 34, and the end of the second shaft 34 is fixedly connected to an opening and closing gear 33;

[0039] And three pressurizing mechanisms 101, the pressurizing mechanisms 101 are fixedly connected to the inner wall of the shell 1.

[0040] In this embodiment, when in use, the drive motor 3 is set to intermittent unidirectional rotation, stopping every ninety degrees, and the crushed battery fragments are placed in batches into the filter frame 5 exposed on the outside of the outer shell 1. In the default state, the two electromagnetic frames 15 are staggered at the bottom of the filter frame 5. At this time, the metal in the fragments will be adsorbed by the electromagnetic frame 15.

[0041] Among them, a limiting slide groove 10 is opened on the outer wall of the collection pool 2, and the end of the hinge shaft 26 is fixedly connected to the transmission gear 30. The outer wall of the transmission gear 30 is meshed with a rack plate 29, and the rack plate 29 is slidingly connected to the mounting frame 25. The outer wall of the rack plate 29 is fixedly connected to the sliding shaft 28, and the sliding shaft 28 is slidingly connected to the collection pool 2 through the limiting slide groove 10.

[0042] The pressurizing mechanism 101 includes a hydraulic cylinder 9 and a pressing plate 8 . The hydraulic cylinder 9 is fixedly connected to the inner wall of the housing 1 , and the pressing plate 8 is fixedly connected to the end of the hydraulic cylinder 9 .

[0043] The outer wall of the pressure plate 8 is fixedly connected to a connecting frame 11 , and both sides of the connecting frame 11 are fixedly connected to symmetrically distributed first rack rods 12 , which are engaged with the outer wall of the first gear 21 .

[0044] The outer wall of the side plate 7 is fixedly connected with a storage box 17 , and the storage box 17 is at the same height as the receiving plate 31 . The outer walls on both sides of the filter frame 5 are fixedly connected with the tooth block group 14 .

[0045] In this embodiment, the three hydraulic cylinders 9 will drive the pressure plate 8 to move downward, fully squeeze the battery fragments in the filter frame 5 and promote the falling of the electrolyte. Due to the action of the ratchet assembly 22, the first rack rod 12 on the connecting frame 11 will not drive the ratchet assembly 22 to rotate when the pressure plate 8 moves downward. It is set that when the pressure plate 8 moves upward, the first rack rod 12 will drive the first gear 21 to rotate, and at the same time drive the ratchet assembly 22 to rotate one circle, so that the ratchet assembly 22 drives the first shaft rod 19 and the outer connecting plate 18 and the connecting slide 16 to rotate one circle. The connecting slide 16 will adaptively retract into the outer connecting plate 18 due to resistance. The two ends of the electromagnetic frame 15 will move upward along the rectangular limit frame 20 first, driving the side plates 7 to move upward synchronously. The electromagnetic frame 15 moves upward to disperse the squeezed battery fragments, while continuously adsorbing the metal substances inside it. Then the electromagnetic frame 15 moves backward along the top of the limit frame 20, so that the side plates 7 gather the metal substances adsorbed on the outer wall of the electromagnetic frame 15 to the end of the electromagnetic frame 15.

[0046] Two evenly distributed springs 23 are fixedly connected between the outer connecting plate 18 and the connecting slide plate 16 .

[0047] The outer wall of the filter frame 5 is fixedly connected with a resisting rod 13 .

[0048] Among them, four mounting frames 25 are set on the outer wall of the central connecting frame 6, and the four mounting frames 25 are distributed in a circular array. Metal extraction mechanisms 202 are set on both sides of each filter frame 5, and every two adjacent electromagnetic frames 15 are staggered.

[0049] In this embodiment, when the second shaft 34 is engaged with the tooth block group 14, the receiving plate 31 is controlled to open a certain angle. At this time, the receiving plate 31 is located below the end of the electromagnetic frame 15. When the electromagnetic frame 15 moves until the end is flush with the side plate 7, the magnetic force of the electromagnetic frame 15 is turned off, and all the metal materials fall into the receiving plate 31, the side plate 7 and the storage box 17 and are collected by the storage box 17. After the electromagnetic frame 15 moves down along the outside of the limit frame 20, the second shaft 34 is engaged with the tooth block group 14 again, thereby closing the channel, and the electromagnetic frame 15 is reinserted into the side plate 7 and the battery fragments from the bottom of the limit frame 20. The magnetic force of the electromagnetic frame 15 is turned on to continue collecting metal materials in the battery fragments.

[0050] The electrolyte falls into the collection tank 2 through the bottom of the filter frame 5. After being squeezed by the hydraulic cylinder 9 and the pressure plate 8 three times, the sliding shaft 28 moves to Figure 3 As shown, when the limiting slide groove 10 is within the concave range, the sliding shaft 28 moves toward the filter frame 5, driving the transmission gear 30 to rotate through the rack plate 29, thereby driving the entire filter frame 5 to turn upside down and dump out the battery fragments.

[0051] The specific working principle and usage method of the present invention are explained in detail below: When in use, the drive motor 3 is set to intermittent unidirectional rotation, stopping every ninety degrees of rotation, and the crushed battery fragments are placed in batches into the filter frame 5 exposed on the outside of the shell 1. The three hydraulic cylinders 9 will drive the pressure plate 8 to move downward, fully squeezing the battery fragments in the filter frame 5 to promote the falling of the electrolyte. In the default state, the two electromagnetic frames 15 are staggered at the bottom of the filter frame 5. At this time, the metal in the fragments will be adsorbed by the electromagnetic frames 15.

[0052] Due to the action of the ratchet assembly 22, when the pressure plate 8 moves downward, the first rack rod 12 on the connecting frame 11 will not drive the ratchet assembly 22 to rotate. It is set that when the pressure plate 8 moves upward, the first rack rod 12 will drive the first gear 21 to rotate, and at the same time drive the ratchet assembly 22 to rotate one circle, so that the ratchet assembly 22 drives the first shaft rod 19, the outer connecting plate 18 and the connecting slide 16 to rotate one circle. The connecting slide 16 will adaptively retract into the outer connecting plate 18 due to resistance. The two ends of the electromagnetic frame 15 will move up first along the rectangular limit frame 20, driving the side plate 7 to move up synchronously. The upward movement of the electromagnetic frame 15 will disperse the squeezed battery fragments and continue to absorb the metal substances inside it. Then the electromagnetic frame 15 moves backward along the top of the limit frame 20, so that the side plate 7 will gather the metal substances adsorbed on the outer wall of the electromagnetic frame 15 to the end of the electromagnetic frame 15.

[0053] At the same time, when the second shaft 34 is engaged with the tooth block group 14, the receiving plate 31 is controlled to open a certain angle. At this time, the receiving plate 31 is located below the end of the electromagnetic frame 15. When the electromagnetic frame 15 moves until the end is flush with the side plate 7, the magnetic force of the electromagnetic frame 15 is turned off, and all the metal materials fall into the receiving plate 31, the side plate 7 and the storage box 17 and are collected by the storage box 17. After the electromagnetic frame 15 moves down along the outside of the limit frame 20, the second shaft 34 is engaged with the tooth block group 14 again, thereby closing the channel. The electromagnetic frame 15 is reinserted into the side plate 7 and the battery fragments from the bottom of the limit frame 20. The magnetic force of the electromagnetic frame 15 is turned on to continue collecting metal materials in the battery fragments.

[0054] The electrolyte falls into the collection tank 2 through the bottom of the filter frame 5. After being squeezed by the hydraulic cylinder 9 and the pressure plate 8 three times, the sliding shaft 28 moves to Figure 3 As shown, when the limiting slide groove 10 is within the concave range, the sliding shaft 28 moves toward the filter frame 5, driving the transmission gear 30 to rotate through the rack plate 29, thereby driving the entire filter frame 5 to turn upside down and dump out the battery fragments.

[0055] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are common means well known to those skilled in the art.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A waste lithium battery processing device, comprising a housing (1), a collecting tank (2) fixedly connected to the bottom outer wall of the housing (1), a driving motor (3) fixedly connected to the bottom outer wall of the collecting tank (2), an output shaft of the driving motor (3) fixedly connected to a mounting column (4), the mounting column (4) and the collecting tank (2) are rotatably connected, an outer wall of the mounting column (4) fixedly connected to a central connecting frame (6), an outer wall of the central connecting frame (6) fixedly connected to a mounting frame (25), an end of the mounting frame (25) is hingedly connected to a connecting plate (27) through a hinge shaft (26), an outer wall of the connecting plate (27) fixedly connected to a filter frame (5), and both side outer walls of the filter frame (5) are slidably connected to symmetrically distributed side plates (7), characterized in that Also includes: The metal extraction mechanism (202) includes an electromagnetic frame (15), the electromagnetic frame (15) is slidably connected to the side plate (7), the outer wall of the electromagnetic frame (15) is fixedly connected to a connecting shaft (24), the outer wall of the connecting shaft (24) is rotatably connected to a connecting slide (16), the outer wall of the connecting slide (16) is slidably connected to an outer connecting plate (18), the inner wall of the outer connecting plate (18) is fixedly connected to a first shaft (19), both ends of the first shaft (19) are rotatably connected to a limit frame (20), and both limit frames (20) are fixedly connected to the filter frame (5) through a double-sided connecting rod (32); One end of the first shaft (19) is fixedly connected to a driving mechanism (303), comprising a ratchet assembly (22) and a first gear (21), the ratchet assembly (22) being fixedly connected to the end of the first shaft (19), and the first gear (21) being rotationally connected to the shaft and the ratchet assembly (22); The inner walls of the side plates (7) are each provided with a metal storage mechanism (404), comprising a receiving plate (31), the receiving plate (31) being rotatably connected to the side plates (7) via a second shaft (34), and an opening and closing gear (33) being fixed to the end of the second shaft (34); and three pressurizing mechanisms (101), wherein the pressurizing mechanisms (101) are fixedly connected to the inner wall of the housing (1); The pressurizing mechanism (101) includes a pressing plate (8), the outer wall of the pressing plate (8) is fixedly connected to a connecting frame (11), both sides of the connecting frame (11) are fixedly connected to first rack rods (12) that are symmetrically distributed, and the first rack rods (12) are meshed with the outer wall of the first gear (21); When the pressure plate (8) moves upward, the first rack rod (12) drives the first gear (21) to rotate, and the two ends of the electromagnetic frame (15) move upward along the limit frame (20) first, driving the side plate (7) to move upward synchronously, thereby breaking up the squeezed battery fragments. The electromagnetic frame (15) moves backward along the top of the limit frame (20), and after the electromagnetic frame (15) moves downward along the outer side of the limit frame (20), the electromagnetic frame (15) is reinserted into the side plate (7) and the battery fragments from the bottom of the limit frame (20).

2. The waste lithium battery processing device according to claim 1, characterized in that: The outer wall of the collection tank (2) is provided with a limiting chute (10), the end of the hinge shaft (26) is fixedly connected to a transmission gear (30), the outer wall of the transmission gear (30) is meshed with a rack plate (29), the rack plate (29) is slidably connected to the mounting frame (25), the outer wall of the rack plate (29) is fixedly connected to a sliding shaft (28), and the sliding shaft (28) is slidably connected to the collection tank (2) through the limiting chute (10).

3. The waste lithium battery processing device according to claim 1, characterized in that: The pressurizing mechanism (101) further comprises a hydraulic cylinder (9), wherein the hydraulic cylinder (9) is fixedly connected to the inner wall of the housing (1), and the pressure plate (8) is fixedly connected to the end of the hydraulic cylinder (9).

4. The waste lithium battery processing device according to claim 1, characterized in that: Two evenly distributed springs (23) are fixedly connected between the outer connecting plate (18) and the connecting slide plate (16).

5. The waste lithium battery processing device according to claim 1, characterized in that: The outer wall of the side plate (7) is fixedly connected to a storage box (17), and the storage box (17) is at the same height as the receiving plate (31). The outer walls on both sides of the filter frame (5) are fixedly connected to a tooth block group (14).

6. The waste lithium battery processing device according to claim 1, characterized in that: The outer wall of the filter frame (5) is fixedly connected with a resisting rod (13).

7. The waste lithium battery processing device according to claim 1, characterized in that: Four mounting frames (25) are provided on the outer wall of the central connecting frame (6), and the four mounting frames (25) are distributed in a circular array. Metal extraction mechanisms (202) are provided on both sides of each filter frame (5), and every two adjacent electromagnetic frames (15) are staggered.

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