Demagnetizing device for lithium iron phosphate production

Abstract

The utility model discloses a demagnetizing device for lithium iron phosphate production, which comprises a shell, a demagnetizing component and a scraping component, the demagnetizing component comprises at least one magnetic bar group, the magnetic bar group comprises a plurality of permanent magnetic bars, the plurality of permanent magnetic bars are sequentially arranged at intervals along the horizontal direction and are all connected to the shell in a sliding manner, and the scraping component is arranged on the shell. The material scraping assembly comprises a containing shell and a plurality of scraping parts, the containing shell is arranged on the permanent magnet bars in a sleeving mode and connected to the shell, the permanent magnet bars are sleeved with the scraping parts, the scraping parts are connected to the inner wall of the containing shell, and the scraping parts can abut against the circumferential outer walls of the permanent magnet bars so as to scrape magnetic materials on the surfaces of the permanent magnet bars. The utility model can solve the problems that the time and the labor are wasted and the production efficiency is influenced because magnetic materials attached to the surface of a replaced magnetic bar need to be manually cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of demagnetization equipment, in particular to a demagnetization device for lithium iron phosphate production. Background Art

[0002] In material production, iron removers are usually used to remove magnetic materials mixed in the materials.

[0003] For example, the Chinese utility model patent with application number: CN201820576635.X is named: A de-ironing machine, including a machine body, a feed port, a discharge part, a permanent magnet rod, a mounting frame, a driving cylinder and a three-way valve. The feed port is arranged at the top of the machine body, the discharge part is arranged at the bottom of the machine body, the mounting frame is arranged at the side of the machine body, one end of the permanent magnet rod is arranged on the mounting frame, and the other end is penetrated on the machine body. The permanent magnet rod is arranged horizontally, the length of the permanent magnet rod is greater than the width of the machine body, and multiple permanent magnet rods are arranged in parallel. The driving cylinder is fixed on the machine body, the telescopic end of the driving cylinder is connected to the mounting frame, and the three-way valve is connected to the discharge part. The three-way valve includes a first outlet and a second outlet. The device can facilitate the adjustment of the position of the permanent magnet rod; at the same time, it can make the magnetic material and the material discharged from different outlets, thereby improving production efficiency. However, the magnetic rods that are usually replaced need to manually clean the magnetic materials attached to the surface, which is not only time-consuming and labor-intensive, but also affects production efficiency.

[0004] Therefore, there is an urgent need for a demagnetization device for lithium iron phosphate production to solve the problem in the prior art that the magnetic material attached to the surface of the replaced magnetic rod needs to be manually cleaned, which is time-consuming and labor-intensive and affects production efficiency. Utility Model Content

[0005] In view of this, it is necessary to provide a demagnetization device for lithium iron phosphate production to solve the technical problem in the prior art that the magnetic material attached to the surface of the replaced magnetic rod needs to be manually cleaned, which is time-consuming and labor-intensive and affects production efficiency.

[0006] In order to achieve the above technical purpose, the technical solution of the utility model provides a demagnetization device for lithium iron phosphate production, comprising:

[0007] case;

[0008] A demagnetization assembly, comprising at least one magnetic bar group, wherein the magnetic bar group comprises a plurality of permanent magnetic bars, wherein the plurality of permanent magnetic bars are sequentially spaced apart in a horizontal direction and are all slidably connected to the housing; and

[0009] The scraper assembly includes a containing shell and a plurality of scraping members. The containing shell is sleeved on the plurality of permanent magnetic rods and connected to the shell body. The scraping members are sleeved on the permanent magnetic rods and connected to the inner wall of the containing shell. The scraping members can abut against the circumferential outer wall of the permanent magnetic rods to scrape off the magnetic material on the surface of the permanent magnetic rods.

[0010] Furthermore, a plurality of first through holes are formed on the side wall of the shell, the first through holes are connected to the interior of the shell, the accommodating shell is provided with a second through hole relative to the first through hole, the second through hole passes through the accommodating shell, the permanent magnetic rods are arranged in one-to-one correspondence with the first through holes, and one end of the permanent magnetic rods passes through the first through hole and the second through hole in sequence and is built into the shell, the scraping member is provided with a scraping channel relative to the second through hole, and the scraping member is sleeved on the permanent magnetic rod through the scraping channel and connected to the accommodating shell.

[0011] Furthermore, the scraper member includes a scraper ring, a plurality of scraper parts and an elastic part. The scraper channel is formed at the center of the scraper ring. The plurality of scraper parts are arranged at intervals along the circumferential direction of the scraper channel, and one end of the scraper part is hinged to the scraper ring, and the other end can abut against the circumferential outer wall of the permanent magnetic rod. The elastic part is connected to the plurality of scraper parts to provide an elastic restoring force that drives the other ends of the plurality of scraper parts to abut against the permanent magnetic rod.

[0012] Furthermore, the scraper ring is provided with a plurality of rotating grooves, and the rotating grooves are arranged one-to-one corresponding to the scraper part. The scraper part includes a scraper block, a rotating block and two rotating shafts. The scraper block is arranged relative to the circumferential outer wall of the permanent magnetic rod, and the rotating block is rotatably inserted in the rotating groove. The two rotating shafts are respectively arranged on both sides of the rotating block, and one end of the rotating shaft is connected to the rotating block, and the other end is rotatably connected to the inner wall of the rotating groove.

[0013] Furthermore, the cross-sectional area of ​​the scraper block gradually decreases in a direction approaching the permanent magnetic bar.

[0014] Furthermore, the scraper block is also provided with a clamping groove, the elastic portion is annular, and the elastic portion is clamped in a plurality of the clamping grooves.

[0015] Furthermore, the scraper assembly also includes a connecting plate, which is built into the accommodating shell, and a third through hole is opened on the connecting plate relative to the second through hole, and the connecting plate is sleeved on the permanent magnetic rod through the third through hole, the scraping ring corresponds to the third through hole one by one and is coaxially arranged with the third through hole, and a plurality of scraping rings are connected to the connecting plate.

[0016] Furthermore, there are multiple magnetic bar groups in the demagnetization component, and the multiple magnetic bar groups are arranged in sequence and at intervals along the vertical direction, and are staggered between two adjacent permanent magnetic bars from top to bottom.

[0017] Furthermore, the demagnetization assembly also includes multiple connectors and multiple driving members, the connectors are arranged one-to-one corresponding to the magnetic bar groups, and the other ends of the multiple permanent magnetic bars are connected to the connectors, the driving members have a fixed end and an extended end, the fixed end of the driving member is connected to the shell, and the extended end is connected to the connector, which is used to drive the permanent magnetic bars to slide relative to the shell.

[0018] Furthermore, a feed port is provided at the top of the shell, and a first discharge port and a second discharge port are provided at the bottom thereof; the feed port and the first discharge port are both arranged relative to the magnetic rod group and are connected, and the second discharge port is connected to the interior of the containing shell.

[0019] Compared with the prior art, the beneficial effects of the utility model include: after the material enters the shell, the material is separated from the magnetic material under the action of the magnetic adsorption force generated by the permanent magnetic rod, and the permanent magnetic rod is slid relative to the shell to facilitate the replacement of the permanent magnetic rod, and at the same time, the containing shell is sleeved on the permanent magnetic rod and connected to the shell, and the scraping piece is sleeved on the permanent magnetic rod and connected to the containing shell, and the scraping piece can abut against the circumferential outer wall of the permanent magnetic rod to scrape off the magnetic material. Compared with the prior art, by sleeved on the permanent magnetic rod, and making the scraping piece abut against the circumferential outer wall of the permanent magnetic rod, the scraping piece can scrape off the magnetic material attached to the circumferential outer wall of the permanent magnetic rod while driving the permanent magnetic rod to slide relative to the shell, avoiding manual cleaning of the replaced magnetic rod, and convenient operation, which can solve the technical problem in the prior art that the replaced magnetic rod needs to manually clean the magnetic material attached to the surface, which is time-consuming and labor-intensive and affects production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a demagnetization device for lithium iron phosphate production provided by an embodiment of the utility model;

[0021] Figure 2 It is a three-dimensional structural schematic diagram of another state of a demagnetization device for lithium iron phosphate production provided by an embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of a three-dimensional structure in which a containing shell, a connecting plate, a scraping member and a permanent magnetic rod are connected to each other provided in an embodiment of the utility model;

[0023] Figure 4 yes Figure 3 A local enlarged schematic diagram of the middle A;

[0024] Figure 5 It is a cross-sectional structural schematic diagram of the scraping ring provided by the embodiment of the utility model, which is connected with the rotating block, the scraping block and the rotating shaft;

[0025] Figure 6 It is a cross-sectional structural schematic diagram of the connection between the rotating block, the scraping block and the rotating shaft provided in the embodiment of the utility model.

[0026] Description of reference numerals:

[0027] Shell 1;

[0028] Feed inlet 11;

[0029] A first discharge port 12;

[0030] A second discharge port 13;

[0031] Demagnetization component 2;

[0032] Magnetic bar set 21;

[0033] Permanent magnetic bar 211;

[0034] Scraper assembly 3;

[0035] A housing 31;

[0036] Scraping member 32;

[0037] Scraping ring 321;

[0038] Scraping part 322;

[0039] Scraper block 3221;

[0040] Rotating block 3222;

[0041] and two rotating shafts 3223;

[0042] Elastic part 323;

[0043] Connecting plate 33;

[0044] Connector 34;

[0045] Driving member 35. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0047] See also Figures 1 to 3The utility model provides a demagnetization device for lithium iron phosphate production, including a shell 1, a demagnetization component 2 and a scraper component 3. The demagnetization component 2 includes at least one magnetic bar group 21, and the magnetic bar group 21 includes a plurality of permanent magnetic bars 211. The plurality of permanent magnetic bars 211 are arranged in sequence and spaced apart in the horizontal direction and are all slidably connected to the shell 1. The scraper component 3 includes a accommodating shell 31 and a plurality of scraping members 32. The accommodating shell 31 is sleeved on the plurality of permanent magnetic bars 211 and connected to the shell 1. The scraping members 32 are sleeved on the permanent magnetic bars 211 and connected to the inner wall of the accommodating shell 31, and the scraping members 32 can abut against the circumferential outer wall of the permanent magnetic bars 211 to scrape off the magnetic material on the surface of the permanent magnetic bars 211.

[0048] In this device, after the material enters the shell 1, the material is separated from the magnetic material under the action of the magnetic adsorption force generated by the permanent magnetic rod 211. The permanent magnetic rod 211 slides relative to the shell 1, which facilitates the replacement of the permanent magnetic rod 211. At the same time, the containing shell 31 is sleeved on the permanent magnetic rod 211 and connected to the shell 1. The scraping member 32 is sleeved on the permanent magnetic rod 211 and connected to the containing shell 1. The scraping member 32 can abut against the circumferential outer wall of the permanent magnetic rod 211 to scrape off the magnetic material.

[0049] Compared with the prior art, by sleeved the scraper 32 on the permanent magnetic rod 211 and enabling the scraper 32 to abut against the circumferential outer wall of the permanent magnetic rod 211, the scraper 32 can scrape off the magnetic material attached to the circumferential outer wall of the permanent magnetic rod 211 while driving the permanent magnetic rod 211 to slide relative to the shell 1, thereby avoiding manual cleaning of the replaced magnetic rod. The operation is convenient and can solve the technical problem in the prior art that the replaced magnetic rod needs to be manually cleaned of the magnetic material attached to the surface, which is time-consuming and labor-intensive and affects production efficiency.

[0050] Specifically, after the material in the device enters the shell 1, it needs to pass through the magnetic rod group 21. The magnetic material is adsorbed by the permanent magnetic rod 211, and the non-magnetic material is separated and collected. The working principle of the demagnetization device here belongs to the conventional setting known to technical personnel in this field and will not be elaborated on.

[0051] like Figures 1 to 3 As shown, a plurality of first through holes are formed on the side wall of the shell 1, and the first through holes are connected with the interior of the shell 1; a second through hole is formed on the accommodating shell 31 relative to the first through hole, and the second through hole penetrates the accommodating shell 31; the permanent magnetic rod 211 is arranged in one-to-one correspondence with the first through hole, and one end of the permanent magnetic rod 211 passes through the first through hole and the second through hole in sequence, and is built into the shell 1; a scraping member 32 is formed with a scraping channel relative to the second through hole, and the scraping member 32 is sleeved on the permanent magnetic rod 211 through the scraping channel, and is connected to the accommodating shell 31.

[0052] The permanent magnetic bar 211 is slidably connected to the housing 1 and the accommodating shell 31 through the first through hole and the second through hole respectively, and the permanent magnetic bar 211 is slidably connected to the scraping member 32 through the scraping channel.

[0053] Furthermore, the containing shell 31 supports and connects the permanent magnetic rod 211 .

[0054] like Figures 4 to 6 As shown, the scraper 32 includes a scraper ring 321 , a plurality of scraper portions 322 and an elastic portion 323 . The scraper portion 322 includes a scraper block 3221 , a rotating block 3222 and two rotating shafts 3223 .

[0055] A scraping channel is formed at the center of the scraping ring 321, and a plurality of scraping portions 322 are arranged at intervals along the circumferential direction of the scraping channel. One end of the scraping portion 322 is hinged to the scraping ring 321, and the other end can abut against the circumferential outer wall of the permanent magnetic rod 211. The elastic portion 323 is connected to the plurality of scraping portions 322 to provide an elastic restoring force that drives the other ends of the plurality of scraping portions 322 to abut against the permanent magnetic rod 211.

[0056] The elastic force generated by the elastic portion 323 enables the scraper portion 322 to rotate relative to the scraper ring 321 , and enables the rotated scraper portion 322 to abut against the circumferential outer wall of the permanent magnetic rod 211 to scrape off the magnetic material.

[0057] As an implementation method, Figures 4 to 6 As shown, the scraper ring 321 is provided with a plurality of rotating grooves, and the rotating grooves are arranged one by one corresponding to the scraper part 322. The scraper block 3221 is arranged relative to the circumferential outer wall of the permanent magnetic rod 211, and the rotating block 3222 is rotatably inserted in the rotating groove. Two rotating shafts 3223 are respectively arranged on both sides of the rotating block 3222, and one end of the rotating shaft 3223 is connected to the rotating block 3222, and the other end is rotatably connected to the inner wall of the rotating groove.

[0058] The rotating block 3222 and the two rotating shafts 3223 play a supporting and connecting role for the connection between the scraping block 3221 and the scraping ring 321 .

[0059] As a preferred implementation method, Figure 6 As shown, the cross-sectional area of ​​the scraper block 3221 gradually decreases in the direction approaching the permanent magnet bar 211 .

[0060] The change in the cross-sectional area of ​​the scraping block 3221 is beneficial to improving the scraping effect.

[0061] As an implementation method, Figure 4 As shown, the scraper block 3221 is further provided with a clamping groove, the elastic portion 323 is annular, and the elastic portion 323 is clamped in a plurality of the clamping grooves.

[0062] The elastic portion 323 is engaged with the plurality of scraper blocks 3221 through the engaging grooves.

[0063] Specifically, the elastic part 323 in the present device is an elastic clamp that is common and easy to purchase on the market. The elastic clamp here is a conventional setting well known to those skilled in the art and will not be described in detail.

[0064] like Figure 1 , Figure 2 As shown, the scraper assembly 3 further includes a connecting plate 33 , a plurality of connecting bodies 34 and a plurality of driving members 35 .

[0065] Among them, the connecting plate 33 is built into the accommodating shell 31, and a third through hole is opened in the connecting plate 33 relative to the second through hole, and the connecting plate 33 is sleeved on the permanent magnetic rod 211 through the third through hole, the scraping ring 321 corresponds to the third through hole one by one and is coaxially arranged with the third through hole, and multiple scraping rings 321 are connected to the connecting plate 33.

[0066] The connecting plate 33 is used to connect and install a plurality of scraper rings 321 .

[0067] As an implementation method, Figure 1 , Figure 2 As shown, a plurality of magnetic bar groups 21 are arranged in sequence and at intervals along the vertical direction, and two adjacent permanent magnetic bar groups 211 from top to bottom are arranged in an alternating manner.

[0068] The staggered arrangement of the permanent magnetic bars 211 can enhance the demagnetization effect.

[0069] As another implementation method, Figure 1 , Figure 2 As shown, the connector 34 is arranged one-to-one with the magnetic rod group 21, and the other ends of the multiple permanent magnetic rods 211 are all connected to the connector 34. The driving member 35 has a fixed end and an extended end. The fixed end of the driving member 35 is connected to the shell 1, and the extended end is connected to the connector 34, which is used to drive the permanent magnetic rods 211 to slide relative to the shell 1.

[0070] By driving the driving member 35 , a plurality of permanent magnetic rods 211 located at the same height can be driven to slide relative to the housing 1 , thereby improving production efficiency.

[0071] Furthermore, the driving component 35 here is a linear driving structure such as a cylinder, a hydraulic cylinder, and a push rod motor that is common and easy to purchase on the market. The linear driving structures such as the cylinder, the hydraulic cylinder, and the push rod motor here are conventional settings well known to technical personnel in this field and will not be described in detail.

[0072] As another implementation method, Figure 1 , Figure 2As shown, a feed port 11 is provided at the top of the shell 1, and a first discharge port 12 and a second discharge port 13 are provided at the bottom. The feed port 11 and the first discharge port 12 are both arranged relative to the magnetic rod group 21 and are connected. The second discharge port 13 is connected to the interior of the containing shell 31.

[0073] The first discharge port 12 is used to collect the separated materials, and the second discharge port 13 is used to collect the cleaned and scraped magnetic materials.

[0074] The specific working process of the utility model is that after the material enters the shell 1, the material is separated from the magnetic material under the action of the magnetic adsorption force generated by the permanent magnetic rod 211, and the permanent magnetic rod 211 slides relative to the shell 1, so that the permanent magnetic rod 211 can be easily replaced. At the same time, the accommodating shell 31 is sleeved on the permanent magnetic rod 211 and connected to the shell 1, and the scraping member 32 is sleeved on the permanent magnetic rod 211 and connected to the accommodating shell 31. The scraping member 32 can abut against the circumferential outer wall of the permanent magnetic rod 211 to scrape off the magnetic material. Compared with the prior art, by sleeved on the permanent magnetic rod 211 by the scraping member 32, and making the scraping member 32 abut against the circumferential outer wall of the permanent magnetic rod 211, the scraping member 32 can scrape off the magnetic material attached to the circumferential outer wall of the permanent magnetic rod 211 while driving the permanent magnetic rod 211 to slide relative to the shell 1, so as to avoid manual cleaning of the replaced magnetic rod, and the operation is convenient.

[0075] When in use, the user sequentially puts the materials into the feed port 11 of the shell 1, and the magnetic materials are adsorbed by the permanent magnetic rod 211, and the separated materials fall from the first discharge port 12 and are collected. When the magnetic rod needs to be cleaned, the extended end of the driving member 35 is first driven to extend, driving the permanent magnetic rod 211 to slide relative to the shell 1, wherein the scraper block 3221 is always in contact with the circumferential outer wall of the permanent magnetic rod 211 under the elastic force generated by the elastic part 323, and as the permanent magnetic rod 211 is continuously drawn out of the shell 1, the magnetic flow attached to the surface of the permanent magnetic rod 211 is scraped off and collected in the containing shell 31, and finally discharged from the second discharge port 13.

[0076] Furthermore, when the cleaning is completed, the driving member 35 drives the permanent magnet rod 211 to be inserted into the shell 1. The permanent magnet rod 211 can overcome the elastic force generated by the elastic part 323 and continuously push the scraper block 3221 away, so that the scraper block 3221 has a tendency to continuously move away from the permanent magnet rod 211, thereby not affecting the insertion of the permanent magnet rod 211 into the shell 1.

[0077] The device, through the above structure, can solve the technical problem in the prior art that the magnetic material attached to the surface of the replaced magnetic rod needs to be manually cleaned, which is time-consuming and labor-intensive and affects production efficiency.

[0078] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A demagnetization device for lithium iron phosphate production, characterized in that: include: case; The demagnetization assembly includes at least one magnetic bar group, wherein the magnetic bar group includes a plurality of permanent magnetic bars, and the plurality of permanent magnetic bars are arranged in sequence and spaced apart in a horizontal direction and are all slidably connected to the housing; as well as The scraper assembly includes a containing shell and a plurality of scraping members. The containing shell is sleeved on the plurality of permanent magnetic rods and connected to the shell body. The scraping members are sleeved on the permanent magnetic rods and connected to the inner wall of the containing shell. The scraping members can abut against the circumferential outer wall of the permanent magnetic rods to scrape off the magnetic material on the surface of the permanent magnetic rods.

2. The demagnetization device for lithium iron phosphate production according to claim 1, characterized in that: A plurality of first through holes are formed on the side wall of the shell, and the first through holes are connected with the interior of the shell. A second through hole is formed on the accommodating shell relative to the first through hole, and the second through hole penetrates the accommodating shell. The permanent magnetic rods are arranged in one-to-one correspondence with the first through holes, and one end of the permanent magnetic rods passes through the first through hole and the second through hole in sequence and is built into the shell. A scraping channel is formed on the scraping member relative to the second through hole, and the scraping member is sleeved on the permanent magnetic rod through the scraping channel and connected to the accommodating shell.

3. The demagnetization device for lithium iron phosphate production according to claim 2, characterized in that: The scraper member includes a scraper ring, a plurality of scraper parts and an elastic part. The scraper channel is formed at the center of the scraper ring. The plurality of scraper parts are arranged at intervals along the circumferential direction of the scraper channel, and one end of the scraper part is hinged to the scraper ring, and the other end can abut against the circumferential outer wall of the permanent magnetic rod. The elastic part is connected to the plurality of scraper parts to provide an elastic restoring force that drives the other ends of the plurality of scraper parts to abut against the permanent magnetic rod.

4. The demagnetization device for lithium iron phosphate production according to claim 3, characterized in that: The scraper ring is provided with a plurality of rotating grooves, and the rotating grooves are arranged in one-to-one correspondence with the scraper part. The scraper part includes a scraper block, a rotating block and two rotating shafts. The scraper block is arranged relative to the circumferential outer wall of the permanent magnetic rod, and the rotating block is rotatably inserted in the rotating groove. The two rotating shafts are respectively arranged on both sides of the rotating block, and one end of the rotating shaft is connected to the rotating block, and the other end is rotatably connected to the inner wall of the rotating groove.

5. The demagnetization device for lithium iron phosphate production according to claim 4, characterized in that: The cross-sectional area of ​​the scraper block gradually decreases along a direction approaching the permanent magnetic bar.

6. The demagnetization device for lithium iron phosphate production according to claim 4, characterized in that: The scraper block is further provided with a clamping groove, the elastic part is annular, and the elastic part is clamped in a plurality of the clamping grooves.

7. The demagnetization device for lithium iron phosphate production according to claim 4, characterized in that: The scraper assembly also includes a connecting plate, which is built into the accommodating shell, and a third through hole is opened on the connecting plate opposite to the second through hole, and the connecting plate is sleeved on the permanent magnetic rod through the third through hole, the scraping ring corresponds to the third through hole one by one and is coaxially arranged with the third through hole, and a plurality of scraping rings are connected to the connecting plate.

8. The demagnetization device for lithium iron phosphate production according to claim 7, characterized in that: There are multiple magnetic bar groups in the demagnetization component. The multiple magnetic bar groups are arranged in sequence and at intervals along the vertical direction, and are staggered between two adjacent permanent magnetic bars from top to bottom.

9. The demagnetization device for lithium iron phosphate production according to claim 8, characterized in that: The demagnetization assembly also includes multiple connectors and multiple driving members, the connectors are arranged in a one-to-one correspondence with the magnetic bar groups, and the other ends of the multiple permanent magnetic bars are connected to the connectors, the driving members have a fixed end and an extended end, the fixed end of the driving member is connected to the shell, and the extended end is connected to the connector, for driving the permanent magnetic bars to slide relative to the shell.

10. The demagnetization device for lithium iron phosphate production according to claim 1, characterized in that: The shell has a feed port at the top and a first discharge port and a second discharge port at the bottom. The feed port and the first discharge port are arranged relative to the magnetic bar group and are connected. The second discharge port is connected to the interior of the containing shell.

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