Foreign matter filtering equipment

Abstract

The utility model provides foreign matter filtering equipment. The foreign matter filtering equipment comprises a feeding device; the foreign matter filtering device is connected with the feeding device, the foreign matter filtering device comprises a first frame body and a first filtering assembly, a containing cavity is formed in the first frame body, the containing cavity is connected with the feeding device, and the first filtering assembly is arranged in the containing cavity; the vacuum suction device is connected with the foreign matter filtering device; and the discharging device is connected with the vacuum suction device.

Description

Technical Field

[0001] The utility model relates to the field of foreign matter filtering, in particular to a foreign matter filtering device suitable for the field of lithium ion batteries. Background Art

[0002] As a new type of secondary battery with high energy density, good cycle performance and long service life, lithium-ion batteries are currently widely used in mobile power supplies, electric vehicles, home appliances, smart wearable devices, 3C products and other fields, and have gradually become the main power source for new energy vehicles and energy storage, attracting widespread attention from all walks of life in recent years. Among them, artificial graphite is one of the key materials for lithium-ion batteries. It has attracted much attention due to its advantages in cycle performance and rate performance, and is also the mainstream negative electrode material currently commercialized.

[0003] The raw materials of artificial graphite are mainly petroleum coke / needle coke, which is obtained through carbonization and graphitization. Among them, graphitization accounts for more than 50% of the manufacturing cost of artificial graphite.

[0004] During the graphitization process, graphite felt is laid on the top layer of the graphitization furnace. After the graphitization process, the raw materials usually contain graphite felt fluff. If these fluffs are not cleaned up, the safety performance of the battery will be affected.

[0005] At present, there is no supporting device for filtering foreign matter such as lint in the field of negative electrode materials for lithium-ion batteries. Usually, multiple production line screening processes are used to reduce the amount of lint, but it is still impossible to achieve the foreign matter standard of less than 30 lints per batch, and it is impossible to filter out lint below 200μm, resulting in high production costs and low yield of negative electrode materials.

[0006] Therefore, it is necessary to provide a foreign matter filtering device that can effectively reduce the amount of floccules, reduce production costs, and improve product yield. Utility Model Content

[0007] In view of this, the utility model provides a foreign matter filtering device, which can effectively reduce the amount of floccules, reduce production costs, and improve product yield.

[0008] In order to solve the above problems, the utility model provides a foreign matter filtering device, which comprises: a feeding device; a foreign matter filtering device, which is connected to the feeding device, the foreign matter filtering device comprises a first frame and a first filter component, a receiving cavity is formed in the first frame, the receiving cavity is connected to the feeding device, and the first filter component is arranged in the receiving cavity; a vacuum suction device, which is connected to the foreign matter filtering device; and a discharge device, which is connected to the vacuum suction device.

[0009] The foreign matter filtering device provided in this embodiment can remove foreign matter such as fluff in the raw material through the first filtering component when passing through the foreign matter filtering device, which can effectively reduce the amount of fluff, reduce production costs, and improve product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings exemplarily illustrate the embodiments and constitute a part of the specification, and together with the text description of the specification, are used to explain the exemplary implementation of the embodiments. Obviously, the drawings described below are only some embodiments of the utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In all drawings, the same reference numerals refer to similar but not necessarily identical elements.

[0011] Figure 1 This is a structural diagram of a foreign matter filtering device according to one embodiment of the present utility model.

[0012] Figure 2 for Figure 2 The three-dimensional structural diagram of the foreign matter filtering device of the foreign matter filtering equipment shown.

[0013] Figure 3 for Figure 2 Schematic diagram of the exploded view of the foreign matter filtering device shown.

[0014] Figure 4 for Figure 2 The lint removal device is shown in a cross-sectional view along line IV-IV.

[0015] Figure 5 for Figure 1 An exploded view of the second filter assembly of the foreign matter filtering device is shown.

[0016] Figure 6 The exploded view of the second filter assembly of the modified example. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described in detail below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0018] Hereinafter, the embodiments of the present invention will be described in detail. However, the present invention can be embodied in many different forms and should not be construed as being limited to the exemplary embodiments illustrated herein. Rather, these exemplary embodiments are provided so that the present invention is thoroughly and in detail communicated to those skilled in the art.

[0019] Please refer to Figures 1 to 5 , a foreign matter filtering device 100 according to an embodiment of the present invention is described.

[0020] The foreign matter filtering device 100 includes a feeding device 10, a foreign matter filtering device 20, a vacuum suction device 30, a discharge device 40, a first pipeline 50 and a second pipeline 60 which are sequentially arranged. The first pipeline 50 is arranged between the feeding device 10 and the foreign matter filtering device 20, and the second pipeline 60 is arranged between the foreign matter filtering device 20 and the vacuum suction device 30, so that the raw material can sequentially enter the foreign matter filtering device 20 and the vacuum suction device 30 from the feeding device 10, and finally enter the discharge device 40 for discharge. In this embodiment, the raw material may be, but is not limited to, graphite particles.

[0021] The feeding device 10 is used for feeding raw materials and conveying the raw materials to the foreign matter filtering device 20. In this embodiment, the feeding device 10 is funnel-shaped so that the raw materials can enter the first pipeline 50.

[0022] Please refer to Figures 2 to 4 The foreign matter filtering device 20 is used to remove foreign matter such as lint in the raw material. Specifically, the foreign matter filtering device 20 includes a first frame 21, a first filter assembly 22, a cover plate 23, a seal 24, a fixing assembly 25, a first valve group 26, a second valve group 27 and an air supply part 28.

[0023] The first frame body 21 includes a receiving cavity 211 for receiving the first filter assembly 22 so that the raw material can pass through the first filter assembly 22 .

[0024] In the present embodiment, the first frame body 21 is substantially in the shape of a rectangular parallelepiped. In other embodiments, the first frame body 21 may also be in other shapes, such as a cylindrical shape, etc., which is not limited here.

[0025] In addition, the first frame 21 includes a first side wall 212, a second side wall 213, a third side wall 214 and a fourth side wall 215. The first side wall 212 and the second side wall 213 are arranged oppositely, the third side wall 214 and the fourth side wall 215 are arranged oppositely, and the third side wall 214 and the fourth side wall 215 are arranged on different sides between the first side wall 212 and the second side wall 213. The first side wall 212, the second side wall 213, the third side wall 214 and the fourth side wall 215 jointly form the above-mentioned receiving chamber 211. In this embodiment, the first side wall 212 of the first frame 21 is provided with an opening 216, and the opening 216 is convenient for putting in and taking out the first filter assembly 22. The cover plate 23 is covered on the opening 216 to close the receiving chamber 211. In this embodiment, the cover plate 23 is detachably fixed on the first frame 21 by a fixing assembly 25.

[0026] Specifically, the fixing assembly 25 includes a plurality of fixing seats 251 and a plurality of fasteners 252. The fixing seats 251 are fixedly arranged on the third side wall 214 and the fourth side wall 215 of the first frame body 21 on one side close to the first side wall 212, one end of the fastener 252 is rotatably arranged on the fixing seat 251, and the other end of the fastener 252 includes a supporting portion 2521, and the supporting portion 2521 is detachably engaged with the cover plate 23. When the fastener 252 is rotated to a position substantially perpendicular to the first side wall 212, the supporting portion 2521 can be supported on the cover plate 23, so that the cover plate 23 is fixedly arranged on the first frame body 21, thereby covering the opening 216.

[0027] In this embodiment, the fixing seat 251 includes a capstan seat 2511 and a bolt 2512. The capstan seat 2511 protrudes and extends from the third side wall 214 and the fourth side wall 215 of the first frame body 21, and the bolt 2512 passes through the capstan seat 2511 and is fixed on the capstan seat 2511. The fastener 252 is a butterfly bolt, one end of which is rotatably sleeved on the bolt 2512, and the abutment portion 2521 of the other end is engaged with the cover plate 23. Of course, in other embodiments, the fixing seat 251 and the fastener 252 can also be other structures, which are not limited here.

[0028] Furthermore, the seal 24 is sandwiched between the inner side of the cover plate 23 and the first side wall 212 of the first frame body 21 to improve the sealing performance. In this embodiment, the seal 24 is arranged at a position along the cover plate 23 that contacts the edge of the opening 216 of the first frame body 21, so that the receiving cavity 211 becomes a sealed cavity.

[0029] The first filter assembly 22 is received in the receiving chamber 211 and filters the raw material passing through the first frame 21 to filter foreign matter such as lint in the raw material. In this embodiment, the first filter assembly 22 includes two stacked plain filter boxes 221 and a corrugated filter box 222. The corrugated filter box 222 is sandwiched between two adjacent plain filter boxes 221. The screen density of the corrugated filter box 222 is greater than the screen density of the plain filter box 221.

[0030] It can be understood that the wire mesh of the plain filter box 221 is plain weaving, and the wire mesh density is small, which can roughly filter foreign matter such as lint, and the wire mesh of the corrugated filter box 222 is corrugated weaving, and the wire mesh density is large, which can precisely filter foreign matter such as lint, so that the corrugated filter box 222 and the plain filter box 221 are used in combination, which can effectively filter foreign matter such as lint in the raw material and greatly reduce the amount of lint in the raw material. In addition, the plain filter box 221 can also buffer the raw material and change the direction of the raw material, thereby facilitating the raw material to smoothly reach the corrugated filter box 222 with a large wire mesh density and filter foreign matter.

[0031] In the present embodiment, the first filter component 22 is illustrated to include two plain filter boxes 221 and one corrugated filter box 222, and the corrugated filter box 222 is sandwiched between the two plain filter boxes 221. Of course, in other embodiments, multiple plain filter boxes 221 and multiple corrugated filter boxes 222 may be stacked, and each plain filter box 221 and each corrugated filter box 222 may be alternately and repeatedly arranged in the stacking direction, so that the corrugated filter box 222 is between two adjacent plain filter boxes 221 in the stacking direction, which is not limited here.

[0032] In this embodiment, the plain filter box 221 and the corrugated filter box 222 are both in the shape of a cuboid. Of course, in other embodiments, they can also be in other shapes, which are not limited here.

[0033] Further, the first frame 21 is also provided with a support assembly 29, which is arranged on the inner wall of the first frame 21 and is used to support the first filter assembly 22. Specifically, the support assembly 29 includes a plurality of first support portions 291 extending from the inner wall of the third side wall 214 and arranged at intervals, and a plurality of second support portions 292 extending from the inner wall of the fourth side wall 215 and arranged at intervals. The first support portion 291 and the second support portion 292 are arranged opposite to each other, and the distance between two adjacent first support portions 291 is slightly greater than the height of the plain filter box 221 or the corrugated filter box 222. Similarly, the distance between two adjacent second support portions 292 is also slightly greater than the height of the plain filter box 221 or the corrugated filter box 222. In this way, the plain filter box 221 or the corrugated filter box 222 can be supported and positioned at the same time to prevent the plain filter box 221 or the corrugated filter box 222 from shifting during the operation of the foreign matter filtering device 100.

[0034] In this embodiment, the plurality of first supporting parts 291 and the plurality of second supporting parts 292 are plate-like structures extending from the inner walls of the third side wall 214 and the fourth side wall 215, respectively, and are arranged correspondingly and form intervals so that foreign matter can smoothly pass through the first filter assembly 22. In addition, two adjacent first supporting parts 291 and their corresponding second supporting parts 292 form a substantially rectangular receiving space to receive the corresponding plain filter box 221 or corrugated filter box 222, so that the plain filter box 221 and the corrugated filter box 222 can be supported more stably, and the plain filter box 221 or the corrugated filter box 222 can be prevented from shifting during the operation of the foreign matter filtering device 100, thereby achieving a better positioning effect.

[0035] In this embodiment, the foreign matter filtering device 20 further includes a feed connector 201 and a discharge connector 202, which are respectively arranged on opposite sides of the first frame 21, and the feed connector 201 is used to supply raw materials into the first frame 21, and the discharge connector 202 is used to discharge the raw materials from the first frame 21. In this embodiment, the feed connector 201 and the discharge connector 202 are formed as one body with the first frame 21.

[0036] In this embodiment, the feed connector 201 is arranged on the lower side of the first frame body 21, wherein the inner diameter of the end of the feed connector 201 close to the first frame body 21 is larger than the inner diameter of the end of the feed connector 201 away from the first frame body 21, so that the feed connector 201 is a reducer. Therefore, after the raw material enters from the pipeline through the feed port 2011 described later, under the action of the vacuum suction device 30, the raw material can quickly expand to the range corresponding to the coverage of the first filter component 22.

[0037] Furthermore, a feed port 2011 is provided on a side of the feed connector 201 away from the first frame 21, and a first valve group 26 is provided at the feed port 2011, and the first valve group 26 is used to control the raw materials to enter the foreign matter filtering device 20. In addition, a slag discharge port 2012 is also provided near the feed port 2011, which is used to discharge foreign matter falling off the first filtering component 22.

[0038] In this embodiment, the first valve group 26 may be, but is not limited to, a flap valve group. The discharge joint 202 is disposed on the upper side of the first frame 21, and is used to discharge the raw materials filtered by the first filter assembly 22 from the first frame 21. In this embodiment, the inner diameter of the end of the discharge joint 202 close to the first frame 21 is greater than the inner diameter of the end of the discharge joint 202 away from the first frame 21, so that the discharge joint 202 is a reducer, which helps the raw materials filtered by the first filter assembly 22 to enter the second pipeline 60.

[0039] Furthermore, a discharge port 2021 is provided on a side of the discharge joint 202 away from the first frame body 21 , so that the raw materials can be discharged from the first frame body 21 .

[0040] Furthermore, an air supply unit 28 and a second valve group 27 are also provided on one side of the discharge joint 202. The air supply unit 28 is connected to the second valve group 27 and is provided at one end of the discharge joint 202 near the discharge port 2021. The air supply unit 28 is used to provide gas to backflush the first filter assembly 22, so that the foreign matter filtered by the first filter assembly 22 falls off from the first filter assembly 22 and is discharged and collected from the slag discharge port 2012. The second valve group 27 is used to control the entry of gas. The gas may be filtered air to avoid bringing in foreign matter. In this embodiment, the second valve group 27 may be, but is not limited to, a pulse backflush valve group.

[0041] When the first valve group 26 is opened, the raw material enters the foreign matter filtering device 20 through the feed port 2011 and is discharged from the discharge port 2021 after passing through the first filter component 22. When the raw material passes through the foreign matter filtering device 20, foreign matter in the raw material is filtered by the first filter component 22.

[0042] When the first valve group 26 is closed, the second valve group 27 is opened with a delay, that is, after a predetermined time has passed since the first valve group 26 is closed, the gas of the air supply part 28 enters the receiving chamber 211 and supplies air in the direction opposite to the conveying direction of the raw material to perform a back-blowing operation, and the foreign matter filtered by the first filter component 22 is purged by positive pressure, so that the lint and other foreign matter on the first filter component 22 falls off, and the fallen foreign matter is discharged from the slag discharge port 2012. After the back-blowing operation is completed, the second valve group 27 is automatically closed, and the first valve group 26 is reopened, and the above-mentioned foreign matter filtering operation is repeated.

[0043] It is understandable that when the first valve group 26 is closed, the raw materials entering the feeding device 10 are filtered, but at this time, some raw materials still remain in the receiving chamber 211, so the second valve group 27 is opened after a predetermined time from the closing of the first valve group 26, so that the raw materials remaining in the first receiving chamber 211 can be as small as possible, and discharged and collected together with the fallen foreign matter from the slag discharge port 2012. Among them, the predetermined time can be set according to needs and is not limited here.

[0044] The vacuum suction device 30 is used to generate negative pressure when the foreign matter filtering device is in operation, so as to suck the raw material from the feeding device 10 into the foreign matter filtering device 20 by the negative pressure, so that the raw material enters the vacuum suction device 30 and finally flows into the discharge device 40. In this embodiment, the vacuum suction device 30 can be, but is not limited to, a vacuum suction tank, as long as it can generate negative pressure, and is not limited here.

[0045] The discharge device 40 is used to discharge the raw material after the foreign matter is filtered by the foreign matter filtering device 20 and to filter the foreign matter in the raw material for a second time. Specifically, the discharge device 40 includes a discharge member 41, a plurality of third valve groups 42, a plurality of second frames 43 and a plurality of second filter components 44.

[0046] The discharge member 41 is connected to the vacuum suction device 30 and is used to store and discharge the raw material after the foreign matter is filtered by the foreign matter filtering device 20. The bottom of the discharge member 41 is provided with a plurality of discharge portions 411 so that the raw material is discharged from the plurality of discharge portions 411.

[0047] The plurality of third valve groups 42 are disposed between the second filter assembly 44 and the corresponding discharge portion 411 , and are used to control the raw materials to enter the corresponding second frame 43 .

[0048] The plurality of second frames 43 are respectively used to accommodate corresponding second filter components 44 .

[0049] Please refer to Figure 5 , multiple second filter components 44 are used to perform secondary filtration on foreign matter in the raw material. Each second filter component 44 includes a vibration motor 441 and a second filter 442, wherein the vibration motor 441 functions as a vibration source. The second filter 442 includes multiple screens, at least two of which are staggered. In this embodiment, the second filter 44 includes an upper screen 4421, a middle screen 4422, and a lower screen 4423, the upper screen 4421 and the lower screen 4423 are arranged in parallel, and the middle screen 4422 is staggered with the upper screen 4421 and the lower screen 4423.

[0050] Specifically, each screen includes a plurality of parallel transverse mesh wires and a plurality of parallel longitudinal mesh wires, and the transverse mesh wires 4422x of the middle screen 4422 and the transverse mesh wires 4421x of the upper screen 4421 and the transverse mesh wires 4423x of the lower screen 4423 form an angle, and the transverse mesh wires 4421x of the upper screen 4421 and the transverse mesh wires 4423x of the lower screen 4423 are arranged in parallel. The longitudinal mesh lines 4422y of the middle layer screen 4422 form an angle with the longitudinal mesh lines 4421y of the upper layer screen 4421 and the longitudinal mesh lines 4423y of the lower layer screen 4423. The longitudinal mesh lines 4421y of the upper layer screen 4421 and the longitudinal mesh lines 4423y of the lower layer screen 4423 are arranged in parallel. The range of the above angle is 30°-60°, for example 30°, 45°, 60° or any value therebetween.

[0051] Among them, the upper screen 4421, the middle screen 4422, and the lower screen 4423 are all made of extremely fine stainless steel wires that are woven horizontally and vertically. Furthermore, the upper screen 4421 and the lower screen 4423 are 200-mesh screens, and the middle screen 4422 is a 100-mesh screen. By staggering them, the gaps created by the staggered arrangement can further filter the lint and foreign matter on the second filter 442, which can not only reduce the number of lint and other foreign matter below 200μm in the raw materials, but also increase the screening pass rate, thereby increasing the yield of the negative electrode material.

[0052] Of course, the upper screen 4421, the middle screen 4422, and the lower screen 4423 may also be made of screens of other specifications, which are not limited here.

[0053] In this embodiment, although the upper screen 4421, the middle screen 4422, and the lower screen 4423 are shown, in other embodiments, only one upper screen 4421 and one middle screen may be used in combination, or multiple screens of different specifications may be alternately arranged, which is not limited here. In this embodiment, the upper screen 4421, the middle screen 4422, and the lower screen 4423 are fixed to the second frame 43 by bonding.

[0054] It can be understood that after the raw materials are filtered by the foreign matter filtering device 20, the raw materials are sucked into the vacuum suction device 30, and enter the second filter assembly 44 after passing through the second valve group 27, and freely fall to the second filter screen 442. The vibration motor is used as a vibration source to cause the vibration of the second filter screen 442. In this way, the raw material particles that meet the conditions for passing through the second filter screen 442 can smoothly pass through the second filter screen 442, and when the particles with fluff pass through the second filter screen 442, the foreign matter will be changed in shape by the middle layer screen 4422 after passing through the upper screen 4421, resulting in the fluff and other foreign matter not being easy to pass through the second filter screen 442. In this way, the fluff and other foreign matter in the raw material can be filtered for the second time to further remove the fluff and other foreign matter in the raw material. In addition, the second filter screen 442 that filters foreign matter such as fluff will be manually dismantled and replaced with a new filter screen on a regular basis.

[0055] When the foreign matter filtering device 100 provided in this embodiment passes through the foreign matter filtering device 20, foreign matters such as fluff in the raw material can be removed through the first filtering component 22, which can effectively reduce the amount of fluff, reduce production costs, and improve product yield. In addition, when discharging the material, the foreign matters in the raw material can be filtered for a second time through the second filtering component 44, which can further reduce the amount of fluff in the raw material.

[0056] Modifications

[0057] See also Figure 6 In this variation, the difference from the foreign matter filtering device 100 of the above embodiment is that the structure of the second filter 442A is different from the second filter 442, and the other structures are the same as those of the above embodiment and are not limited here.

[0058] The second filter screen 442A includes a plurality of screens, each of which includes a plurality of parallel transverse mesh wires and a plurality of parallel longitudinal mesh wires that are cross-arranged, and adjacent screens are staggered.

[0059] In this embodiment, the second filter 442A includes an upper screen 4421A, a middle screen 4422A and a lower screen 4423A arranged in sequence, and an angle is formed between the transverse mesh wire 4422Ax of the middle screen 4422A and the transverse mesh wire 4421Ax of the upper screen 4421A, an angle is formed between the transverse mesh wire 4422Ax of the middle screen 4422A and the transverse mesh wire 4423Ax of the lower screen 4423A, and the transverse mesh wire 4421Ax of the upper screen 4421A and the transverse mesh wire 4423Ax of the lower screen 4423A. An angle is formed between them, an angle is formed between the longitudinal mesh lines 4422Ay of the middle layer screen 4422A and the longitudinal mesh lines 4421Ay of the upper layer screen 4421A, an angle is formed between the longitudinal mesh lines 4422Ay of the middle layer screen 4422A and the longitudinal mesh lines 4423Ay of the lower layer screen 4423A, and an angle is formed between the longitudinal mesh lines 4421Ay of the upper layer screen 4421A and the longitudinal mesh lines 4423Ay of the lower layer screen 4423A, and the above angles range from 30° to 60°, for example 30°, 45°, 60° or any value therebetween.

[0060] It can be understood that the above-mentioned multiple angles can be the same value or different values, which is not limited here.

[0061] In this embodiment, the upper screen 4421A, the middle screen 4422A and the lower screen 4423A are arranged alternately in pairs, so that the gap formed by the second filter 442A is smaller, which can further reduce the amount of fluff in the raw material and improve the product yield.

[0062] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A foreign matter filtering device, characterized in that: It has: Feeding device; A foreign matter filtering device connected to the feeding device, the foreign matter filtering device comprising a first frame and a first filter assembly, a receiving cavity is formed in the first frame, the receiving cavity is connected to the feeding device, and the first filter assembly is arranged in the receiving cavity; a vacuum suction device connected to the foreign matter filtering device; and A material discharging device is connected to the vacuum material suction device.

2. The foreign matter filtering device according to claim 1, characterized in that: The first filter assembly includes at least two stacked plain filter boxes and at least one corrugated filter box, and the plain filter boxes and the corrugated filter boxes are alternately arranged in the stacking direction.

3. The foreign matter filtering device according to claim 2, characterized in that: The wire mesh density of the at least one corrugated filter box is greater than the wire mesh density of the at least two plain filter boxes.

4. The foreign matter filtering device according to claim 1, characterized in that: A feed port and a discharge port are respectively arranged on both sides of the first frame, and the foreign matter filtering device further comprises a first valve group, which is arranged at one end of the first frame close to the feed port. When the first valve group is opened, the vacuum suction device generates negative pressure so that the raw materials enter the foreign matter filtering device from the feeding device through the feeding port and are then discharged from the discharging port to the vacuum suction device.

5. The foreign matter filtering device according to claim 4, characterized in that: A slag discharge port is also provided at one end of the feed port of the first frame, and the foreign matter filtering device further comprises a second valve group and an air supply part, wherein the second valve group is connected to the air supply part, and the second valve group and the air supply part are provided at one end of the foreign matter filtering device close to the feed discharge port, When the first valve group is closed, the second valve group is opened after a predetermined time from the closing of the first valve group, so as to back-blow the first filter component through the gas from the air supply part, so that the foreign matter filtered by the first filter component falls off from the first filter component and is discharged from the slag discharge port.

6. The foreign matter filtering device according to claim 1, characterized in that: The first frame body comprises a first side wall and a second side wall which are arranged opposite to each other, the first side wall is provided with an opening, and the opening is used for taking in and placing the first filter assembly; The foreign matter filtering device further comprises a cover plate and a fixing assembly. The cover plate is arranged to cover the opening and is fixed to the first frame body through the fixing assembly.

7. The foreign matter filtering device according to claim 6, characterized in that: The foreign matter filtering device further includes a sealing member, and the sealing member is sandwiched between the inner side of the cover plate and the first side wall of the first frame body.

8. The foreign matter filtering device according to claim 6, characterized in that: The first frame includes a third side wall and a fourth side wall which are arranged opposite to each other, and the third side wall and the fourth side wall are arranged on different sides between the first side wall and the second side wall, respectively. The foreign matter filtering device further includes a supporting assembly, which is disposed on the third side wall and the fourth side wall of the first frame body and is used to support the first filtering assembly.

9. The foreign matter filtering device according to claim 1, characterized in that: The discharging device further includes a second frame and a second filter assembly, wherein the second filter assembly is accommodated in the second frame.

10. The foreign matter filtering device according to claim 9, characterized in that: The second filter assembly includes a vibration motor and a second filter screen, and the second filter screen includes a plurality of screens, at least two of which are staggered.

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