Removing device for magnetic foreign matters on tobacco shred conveying line

By designing an electromagnet adsorption device on the tobacco conveyor line and combining it with an air jet from a blower box, the problem of removing magnetic foreign objects has been solved, thereby improving the purity of the tobacco and the stability of the production line.

CN223669387UActive Publication Date: 2025-12-16HONGTA TOBACCO (GROUP) CO LTD
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Patent Information

Application Number
CN202423137391.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-12-16
Estimated Expiration
2034-12-19

AI Technical Summary

Technical Problem

On tobacco processing production lines, magnetic foreign objects such as ferrites and iron alloys are difficult to remove effectively, affecting the purity of tobacco and the stability of downstream equipment.

Method used

Design a device for removing magnetic foreign objects on a tobacco conveyor line. The device uses an electromagnet to attract the magnetic foreign objects and uses a blower box to spray compressed air to bring the tobacco closer to the electromagnet, thereby improving the adsorption effect.

Benefits of technology

It effectively removes small magnetic foreign objects, improves the purity of tobacco, reduces the risk of equipment failure, enhances the stability of the production line, and facilitates the cleaning and maintenance of electromagnets.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a removing device for magnetic foreign matters on a cut tobacco conveying line. The removing device comprises an input belt, a conveyor, a hopper, a cover plate, a cavity, an electromagnet, an air box, a mounting plate, an output belt and the like. A hopper is arranged at a cut tobacco blanking part of the input belt, a cavity is arranged below the hopper, an air box is arranged at the front part in the cavity, an electromagnet is arranged at the rear part, and cut tobacco falls onto the output belt at the middle part; the cavity is connected with a conveyor rack on the output belt through a mounting plate; the electric wire tube of the electromagnet is electrified to excite magnetism to adsorb magnetic foreign matters in the tobacco shreds, compressed air is jetted to the falling tobacco shreds through the air holes in the air box, so that tobacco shred materials are closer to the electromagnet during falling, and the adsorption effect of the electromagnet on the magnetic foreign matters is improved. The magnetic foreign matter removing device is used on a cut tobacco production line, removes magnetic foreign matter such as ferrite and iron element alloy in materials such as cut tobacco, can also be used on a redrying line in tobacco processing, and has the advantages of being simple in structure, remarkable in removing effect and the like.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to the tobacco field relates to cigarette production technology, specifically relates to a kind of magnetic foreign matter's rejection device on cut tobacco conveying line. BACKGROUND

[0002] In tobacco processing industry, tobacco foreign matter rejection process is very important.For example, in the leaf threshing and redrying process, in tobacco sorting and leaf threshing and redrying assembly line, for tobacco foreign matter such as hemp, polystyrene film, metal, feather and wool, stone, paper scraps, straw and other non-smoking sundries, strict process and scientific and technological means are adopted to complete its rejection;Similarly, redried tobacco leaves in the silk-making process still need to take scientific instruments such as foreign matter rejection machine to complete tobacco foreign matter rejection, so as to ensure that cut tobacco has high purity and quality, even so, research on tobacco foreign matter rejection still does not stop.

[0003] For example, on the silk-making production line, due to equipment maintenance and maintenance, parts such as small screws and nuts, even miniature tools, etc. may occasionally occur in the equipment or on the production line;Or due to the wear of equipment, iron filings on some parts fall on the silk-making line and mix with cut tobacco;Or due to sudden failure of equipment, parts debris falls into cut tobacco, etc.Said cut tobacco is often found to contain iron-containing metal tobacco foreign matter, or all have magnetic properties.

[0004] Although such magnetic foreign matter is extremely rare on this silk-making production line, as far as improving cigarette quality and ensuring the stability of downstream equipment operation is concerned, it cannot be ignored, and it is still necessary to further study its rejection method.Analysis shows that the magnetic foreign matter is mainly composed of ferrite, iron element alloy, etc.

[0005] To solve the above problems, the utility model is proposed. CONTENT OF UTILITY MODEL

[0006] To address at least one of the aforementioned problems, this invention provides a device and method for removing magnetic foreign objects from a tobacco conveyor line. The removal device includes an input belt, a conveyor, a hopper, a cover plate, a cavity, an electromagnet, an air box, a mounting plate, and an output belt. A hopper is located at the tobacco feeding section of the input belt, and a cavity is located below the hopper. An air box is located at the front of the cavity, an electromagnet at the rear, and a middle section for the tobacco to fall onto the output belt. The cavity is connected to the conveyor frame on the output belt via the mounting plate. When the electromagnet's wiring is energized, it magnetically attracts magnetic foreign objects from the tobacco. Compressed air is sprayed onto the falling tobacco through vents in the air box, bringing the tobacco closer to the electromagnet during its descent and enhancing the electromagnet's attraction for magnetic foreign objects. This invention can be used in tobacco processing production lines to remove magnetic foreign objects such as ferrites and iron alloys from tobacco and other materials. It can also be used in re-drying lines in tobacco processing, featuring a simple structure and significant removal effect.

[0007] The first aspect of this utility model provides a device for removing magnetic foreign objects on a tobacco conveyor line, which includes: an input belt 1, an arc strip 2, a hopper 3, a cover plate 4, a cavity 5, an electromagnet 6, an output belt 7, a wind box 8, and a mounting plate 9.

[0008] The input belt 1 for inputting tobacco is located on the input conveyor 1-1, and the output belt 7 for outputting tobacco is located on the output conveyor 7-1;

[0009] The hopper 3 is provided downstream of the input belt 1, the cavity 5 is provided below the hopper 3, the wind box 8 is provided downstream of the cavity 5, the hollow part in the middle of the cavity 5 is used for the tobacco to fall onto the output belt 7, and the electromagnet 6 is provided on the side of the cavity 5 opposite to the wind box 8.

[0010] The electromagnet 6 is connected to a conduit 6-1;

[0011] The air box 8 has an air hole 8-2, and the air box 8 is connected to the air pipe 8-1;

[0012] The cover plate 4 is connected to the hopper 3 and the cavity 5 respectively, and the arc strip 2 is welded to the bottom of the hopper 3;

[0013] The cavity 5 is connected to the frame of the output conveyor 7-1 via the mounting plate 9.

[0014] Preferably, the cavity 5 is designed with an electromagnet slot 5-1 and a fan box slot 5-4, and the cavity 5 is specifically provided with an electromagnet threaded hole 5-2, a cover plate threaded hole 5-3, a fan box threaded hole 5-5, and a mounting plate threaded hole 5-6.

[0015] The electromagnet 6 is installed in the electromagnet slot 5-1 through the electromagnet threaded hole 5-2;

[0016] The air box 8 is installed in the air box groove 5-4 through the air box threaded hole 5-5;

[0017] The cover plate 4 has a first mounting hole 4-2, and the cover plate 4 and the cavity 5 are connected through the first mounting hole 4-2 and the cover plate threaded hole 5-3 by a first mounting screw 4-1;

[0018] The mounting plate threaded hole 5-6 is designed outside the cavity 5, and the mounting plate 9 is connected with the cavity 5 through the mounting plate threaded hole 5-6 by a second mounting screw 9-1.

[0019] The cavity 5 is made of aluminum alloy.

[0020] Preferably, the air box 8 is a hollow cuboid, and the size of the air box groove 5-4 matches the size of the cavity 5;

[0021] The air box 8 is uniformly distributed with air holes 8-2 on the side surface, and the air pipe 8-1 is installed at one end of the air box 8 for compressed air injection;

[0022] The air box 8 has a third mounting hole 8-3, and the third mounting hole 8-3 and the air box threaded hole 5-5 are matched, and the air box 8 is installed in the air box groove 5-4 through the third mounting hole 8-3 and the air box threaded hole 5-5.

[0023] Preferably, the size of the electromagnet 6 matches the size of the electromagnet groove 5-1 of the cavity 5;

[0024] The power switch is turned on through the wire tube 6-1 of the electromagnet 6 to control the magnetism of the electromagnet 6;

[0025] The electromagnet 6 has a second mounting hole 6-2, and the second mounting hole 6-2 and the electromagnet threaded hole 5-2 are matched, and the electromagnet 6 is installed in the electromagnet groove 5-1 through the second mounting hole 6-2 and the electromagnet threaded hole 5-2.

[0026] Preferably, the mounting plate 9 has a fourth mounting hole 9-2 and a fifth mounting hole 9-3;

[0027] The fourth mounting hole 9-2 and the mounting plate threaded hole 5-6 are matched, and the mounting plate 9 is connected with the cavity 5 through the fourth mounting hole 9-2 and the mounting plate threaded hole 5-6;

[0028] The fifth mounting hole 9-3 is matched with the conveyor frame 7-1.

[0029] Preferably, the cover plate 4 and the hopper 3 are connected by welding.

[0030] Preferably, the arc strip 2 is welded below the hopper 3, and the arc radius of the arc strip 2 is R10mm, so that the falling tobacco does not rub the electromagnet 6.

[0031] The second aspect of the utility model provides a kind of magnetic foreign matter rejection method on tobacco conveying line, using the magnetic foreign matter rejection device on tobacco conveying line described in the first aspect of the utility model, it includes: unprocessed tobacco is input by the input belt 1, when the tobacco enters hopper 3 by input belt 1, magnetic foreign matter in tobacco is excited by the power cord tube 6-1 of electromagnet 6 and is magnetically adsorbed;Opening air pipe 8-1 is sprayed compressed air to the falling tobacco by the air hole 8-2 on air box 8, so that tobacco material is closer to electromagnet 6 in the process of falling, to improve the magnetic foreign matter adsorption effect;Tobacco after magnetic foreign matter rejection is output by the output belt 7.

[0032] Compared with prior art, the utility model has the following beneficial effects:

[0033] 1, on the tobacco production line, due to equipment maintenance and maintenance, equipment wear and tear and sudden failure, etc., small parts such as screws and nuts are missed in the equipment or on the production line, or some parts of the iron filings are dropped on the tobacco line and mixed with tobacco, which is extremely difficult to detect or remove, and the utility model can effectively solve the problem.

[0034] 2, since the tobacco of the utility model enters trapezoidal hopper by input belt, and the hollow part of the cavity is directly below the trapezoidal hopper, therefore, the tobacco material falls smoothly onto the output belt, and the air hole on the air box sprays compressed air to the falling tobacco, so that there is almost no risk of tobacco material jamming and other faults, and the stability of the production line is improved.

[0035] 3, since arc strip is welded at the outlet part below the hopper, such as arc radius R10mm, the tobacco has a certain distance from the electromagnet during falling, which avoids direct friction on the electromagnet, and also avoids that the foreign matter adsorbed on the electromagnet is taken away by the falling tobacco material, and improves the adsorption effect of the electromagnet.

[0036] 4, since the magnetism of electromagnet is generated by electric current, it can be controlled by the switch of power cord, and the magnetic material adsorbed on the electromagnet is easy to fall or clean when power off, so that maintenance is convenient;Further, since air box is installed in the cavity, air tube can be used to spray compressed air to the air hole on the air box to the falling tobacco, so that the tobacco material is closer to the electromagnet during falling, and the airflow is controllable, which improves the adsorption effect of magnetic foreign matter.

[0037] 5. According to the principle of physics, any substance with magnetism will be attracted by the electromagnet, of course, the magnetic material also includes the substance that can produce magnetism by magnetic field, or the foreign matter with static electricity in the tobacco material, including the dust which is difficult to be seen by naked eyes, etc., can be attracted by the electromagnet, therefore, the device and method for removing the magnetic foreign matter on the tobacco conveying line has important significance for improving the quality of tobacco and cigarettes. BRIEF DESCRIPTION OF DRAWINGS

[0038] For better understanding of the above and other objects, features, advantages and functions of the present application, reference can be made to the embodiments illustrated in the drawings. The same reference numerals in the drawings designate the same components. It should be understood by those skilled in the art that the drawings are intended to illustrate the preferred embodiments of the present application schematically, and have no limiting effect on the scope of the present application, and the components in the drawings are not drawn according to the scale.

[0039] In the drawings:

[0040] Figure 1 is a schematic diagram of the principle of the device for removing the magnetic foreign matter on the tobacco conveying line according to the embodiment of the present application;

[0041] Figure 2 is a schematic diagram of the installation of the device for removing the magnetic foreign matter on the rack of the conveyor according to the embodiment of the present application;

[0042] Figure 3 is a schematic diagram of the design of the hopper according to the embodiment of the present application;

[0043] Figure 4 is a schematic diagram of the design of the cover plate according to the embodiment of the present application;

[0044] Figure 5 is a schematic diagram of the welding of the cover plate and the hopper according to the embodiment of the present application;

[0045] Figure 6 is a schematic diagram of the design of the air box according to the embodiment of the present application;

[0046] Figure 7 is a schematic diagram of the design of the electromagnet according to the embodiment of the present application;

[0047] Figure 8 is a schematic diagram of the design of the mounting plate according to the embodiment of the present application;

[0048] Figure 9 is a schematic diagram of the design of the cavity according to the embodiment of the present application.

[0049] Corresponding names of the reference signs in the drawings are: 1, input belt; 1-1, input conveyor; 2, arc strip; 3, hopper; 4, cover plate; 4-1, first mounting screw; 4-2, first mounting hole; 5, cavity; 5-1, electromagnet slot; 5-2, electromagnet threaded hole; 5-3, cover plate threaded hole; 5-4, wind box sub-slot; 5-5, wind box sub-threaded hole; 5-6, mounting plate threaded hole; 6, electromagnet; 6-1, wire tube; 6-2, second mounting hole; 7, output belt; 7-1, output conveyor; 8, wind box sub; 8-1, air pipe; 8-2, air hole; 8-3, third mounting hole; 9, mounting plate; 9-1, second mounting screw; 9-2, fourth mounting hole; 9-3, fifth mounting hole. DETAILED DESCRIPTION

[0050] The utility model will be described in further detail below in combination with examples.

[0051] Those skilled in the art will understand that the following examples are only for illustrating the utility model and should not be regarded as limiting the scope of the utility model. If the specific technology or condition is not specified in the examples, it is carried out according to the technology or condition described in the literature in the field or according to the product manual. If the manufacturer of the material or equipment is not specified, it is a conventional product that can be obtained by purchase.

[0052] The above and other technical features and advantages of the utility model will be described in further detail below in combination with the drawings. In the description of the utility model, it should be understood that the terms 'first' and'second' are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by 'first' and'second' can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of 'a plurality of' is at least two, unless otherwise specifically limited.

[0053] In the utility model, unless otherwise specifically specified and limited, the terms'mounting', 'connection', 'connecting', 'fixing' and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0054] In the present utility model, unless otherwise expressly provided and limited, the first feature is "on" or "under" the second feature, which can be direct contact of the first and second features, or indirect contact of the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0055] Those skilled in the art can understand that, unless otherwise defined, all terms including technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as such.

[0056] Embodiments

[0057] Referring to the drawings.

[0058] In order to solve the problem of removing magnetic foreign matters on the cut tobacco production line, the present utility model provides a device and method for removing magnetic foreign matters on a cut tobacco conveying line. The device for removing magnetic foreign matters on a cut tobacco conveying line comprises an input belt 1, an input conveyor 1-1, an arc strip 2, a hopper 3, a cover plate 4, a cavity 5, an electromagnet slot 5-1, a wind box slot 5-4, an electromagnet 6, a wire tube 6-1, an output belt 7, an output conveyor 7-1, a wind box 8, an air pipe 8-1, an air hole 8-2, a mounting plate 9, etc.

[0059] The hopper 3 is arranged in front of the blanking position of the input belt 1 for conveying cut tobacco, the cavity 5 is arranged below the hopper 3, the wind box 8 is arranged in the front position of the cavity 5, the hollow middle position is used for the cut tobacco to fall onto the output belt 7, and the electromagnet 6 is arranged in the rear position.

[0060] When the cut tobacco enters the hopper 3 through the input belt 1, the wire tube 6-1 of the electromagnet 6 is electrified to attract the magnetic foreign matters in the cut tobacco; the air pipe 8-1 is opened to spray compressed air through the air hole 8-2 of the wind box 8 to make the cut tobacco material fall closer to the electromagnet 6, so as to improve the magnetic foreign matter adsorption effect.

[0061] The cover plate 4 and the hopper 3 are connected by welding, the arc strip 2 is welded below the hopper 3, the arc radius is R10mm, so as to make the falling cut tobacco not rub against the electromagnet 6; the cover plate 4 is connected through the first mounting hole 4-2 and the cover plate threaded hole 5-3 of the cavity 5.

[0062] Examples of implementation are Figure 1 , 2 , 3.

[0063] The width of the input belt 1 on the input conveyor 1-1 is 1000 mm, and the tobacco flow is 10 t / h. The hopper is designed in a trapezoidal structure, the upper and lower bases are 1100 mm and 800 mm in length, and the upper and lower bases are 230 mm and 150 mm in width, and the trapezoidal structure is 100 mm high. Obviously, the size of the discharge opening at the lower part of the trapezoidal hopper is 800x150 (mm). In order to prevent the tobacco from rubbing against the electromagnet 6 or to keep a certain distance, such as 10 mm, between the falling tobacco and the electromagnet 6, an arc strip 2 is designed or welded at the tobacco outlet, and the arc radius is R10 mm. Figure 3

[0064] As Figure 4 , the cover plate 4 is designed to connect the hopper 3 and the cavity 5. The first mounting hole 4-2 on the cover plate 4 and the cover plate threaded hole 5-3 on the cavity 5 are made in pairs and are installed with the first mounting screw 4-1, and the screw used is M6. The cover plate 4 and the hopper 3 are connected by welding. Figure 5

[0065] The cavity 5 is connected to the output conveyor 7-1 frame of the output belt 7 through the mounting plate 9.

[0066] As Figure 8 described, the mounting plate 9 is designed. The fourth mounting hole 9-2 and the mounting plate threaded hole 5-6 on the cavity 5 are paired, the fifth mounting hole 9-3 and the conveyor frame 7-1 are made, and the second mounting screw 9-1 is used for installation, and the connecting screw uses M6.

[0067] The cavity 5 is designed with an electromagnet slot 5-1 and an electromagnet threaded hole 5-2 for installing the electromagnet 6; the cavity 5 is designed with a wind box slot 5-4 and a wind box threaded hole 5-5 for installing the wind box 8; the outside of the cavity 5 is designed with a mounting plate threaded hole 5-6 for connecting the mounting plate 9; and the cavity is made of aluminum alloy.

[0068] As Figure 9 , the cavity 5 is designed with an aluminum alloy. The central part of the cavity 5 is designed with a through hole paired with the discharge opening of the trapezoidal hopper, and the size of the through hole is 800x150 (mm) for tobacco falling, and the two sides of the through hole are designed with a wind box slot 5-4 and an electromagnet slot 5-1; the cavity 5 is designed with a wind box slot 5-4 and a wind box threaded hole 5-5 for installing the wind box 8, and the size of the wind box slot 5-4 is paired with the wind box 8, and the wind box threaded hole 5-5 is made with the mounting through hole 8-3 on the wind box 8.

[0069] ​​The electromagnet 6 is installed in the electromagnet slot 5-1 and the electromagnet threaded hole 5-2. The electromagnet slot 5-1 is sized to match the electromagnet 6. The electromagnet threaded hole 5-2 is sized to match the second mounting hole 6-2 on the electromagnet 6.

[0070] The air box 8 is a hollow cuboid, and the size of the air box slot 5-4 matches the cavity 5. The air holes 8-2 are evenly distributed on the side of the air box 8, and the air pipe 8-1 is installed at one end for injecting compressed air.

[0071] As Figure 6 , the air box 8 is made of 2mm thick non-perishable steel plate, welded into a cuboid, and multiple evenly distributed air holes 8-2 with a diameter of 2mm are designed on the side of the cuboid, Figure 6 The number of air holes 8-2 is 7x59, and the spacing is 6-10mm. A through hole is designed on one end of the air box 8 and the air pipe 8-1 is welded, and the third mounting hole 8-3 is designed for the air box 8 to be installed in the air box slot 5-4 of the cavity 5.

[0072] The electromagnet 6 is sized to match the electromagnet slot 5-1 of the cavity 5, and the wire tube 6-1 of the electromagnet 6 is connected to the power switch to control the magnetism of the electromagnet 6.

[0073] Figure 7 As

[0074] As mentioned above, in the above embodiment, the air pipe 8-1 is connected to the compressed gas pipeline used in the workshop, and the air injected into the air hole 8-2 will make the falling tobacco closer to the side of the electromagnet 6; the wire tube 6-1 on the electromagnet 6 is connected to the electronic switch, so that the electromagnet 6 has magnetism to adsorb magnetic foreign matter on the tobacco conveying line. After a certain period of time, the power supply on the wire tube 6-1 is turned off, and the magnetic foreign matter on the electromagnet 6 will be removed or will be beneficial to cleaning, etc.

[0075] The method for removing magnetic foreign matter on the tobacco conveying line includes: untreated tobacco is input through the input belt 1, and when the tobacco passes through the input belt 1 into the hopper 3, the wire tube 6-1 of the electromagnet 6 is energized to excite the magnetic foreign matter in the tobacco; the air pipe 8-1 is opened to inject compressed air through the air holes 8-2 on the air box 8 to make the falling tobacco closer to the electromagnet 6 during the falling process, so as to improve the adsorption effect of the magnetic foreign matter; the tobacco after the magnetic foreign matter is removed is output through the output belt 7.

[0076] The above merely describes preferred embodiments of the present application, which are merely illustrative but not restrictive. The structure and connection mode of each component in the present application can be changed, and any equivalent transformation and improvement based on the technical scheme of the present application should not be excluded from the protection scope of the present application.

Claims

1. A device for rejecting magnetic foreign objects on a tobacco conveying line, characterized in that, It includes: input Band (1), arc strip (2), hopper (3), cover plate (4), cavity (5), electromagnet (6), output belt (7), wind box (8), mounting plate (9); The input band (1) of the input tobacco is located on the input conveyor (1-1), and the output band (7) of the output tobacco is located on the output conveyor (7-1); The downstream part of the input band (1) is provided with the hopper (3), the cavity (5) is arranged below the hopper (3), the wind box (8) is arranged in the downstream part of the cavity (5), the hollow part in the middle of the cavity (5) is used for tobacco falling on the output band (7), and the electromagnet (6) is arranged on the side of the cavity (5) away from the wind box (8); The electromagnet (6) is connected with the wire tube (6-1); The wind box (8) has air holes (8-2) on it, and the wind box (8) communicates with the air pipe (8-1); The cover plate (4) is connected with the hopper (3) and the cavity (5) respectively, and the arc strip (2) is welded below the hopper (3); The cavity (5) is connected with the rack of the output conveyor (7-1) through the mounting plate (9).

2. A device for the magnetic removal of foreign bodies in a tobacco conveying line according to claim 1, characterized in that, The cavity (5) is designed with electromagnet groove (5-1) and wind box groove (5-4), and the cavity (5) is provided with electromagnet threaded hole (5-2), cover plate threaded hole (5-3), wind box threaded hole (5-5) and mounting plate threaded hole (5-6); The electromagnet (6) is installed in the electromagnet groove (5-1) through the electromagnet threaded hole (5-2); The wind box (8) is installed in the wind box groove (5-4) through the wind box threaded hole (5-5); The cover plate (4) has a first mounting hole (4-2), and the cover plate (4) and the cavity (5) are connected through the first mounting hole (4-2) and the cover plate threaded hole (5-3) by a first mounting screw (4-1); The mounting plate threaded hole (5-6) is designed on the outside of the cavity (5), and the mounting plate (9) is connected with the cavity (5) by a second mounting screw (9-1) through the mounting plate threaded hole (5-6); The cavity (5) is made of aluminum alloy.

3. A device for the magnetic removal of foreign bodies in a tobacco conveying line according to claim 2, characterised in that, The wind box (8) is a hollow cuboid, and the size of the wind box groove (5-4) of the cavity (5) is matched; The air holes (8-2) are uniformly distributed on the side surface of the wind box (8), and the air pipe (8-1) is installed at one end of the wind box (8) for injecting compressed air; The wind box (8) has a third mounting hole (8-3), which is matched with the wind box threaded hole (5-5), and the wind box (8) is installed in the wind box groove (5-4) through the third mounting hole (8-3) and the wind box threaded hole (5-5).

4. The apparatus of claim 2, wherein, The size of the electromagnet (6) matches the size of the electromagnet groove (5-1) of the cavity (5); The wire tube (6-1) of the electromagnet (6) is connected with the power switch to control the magnetism of the electromagnet (6). The electromagnet (6) has a second mounting hole (6-2) on it, which is matched with the electromagnet threaded hole (5-2), and the electromagnet (6) is mounted in the electromagnet slot (5-1) through the second mounting hole (6-2) and the electromagnet threaded hole (5-2).

5. The apparatus of claim 2, wherein, The mounting plate (9) has a fourth mounting hole (9-2) and a fifth mounting hole (9-3) on it; The fourth mounting hole (9-2) is matched with the mounting plate threaded hole (5-6), and the mounting plate (9) is connected with the cavity (5) through the fourth mounting hole (9-2) and the mounting plate threaded hole (5-6); The fifth mounting hole (9-3) is matched with the output conveyor (7-1).

6. The apparatus of claim 1, wherein, The cover plate (4) and the hopper (3) are connected by welding.

7. The apparatus of claim 1, wherein, The arc strip (2) is welded below the hopper (3), and the arc radius of the arc strip (2) is R10mm, so that the falling tobacco does not rub the electromagnet (6).