Magnetic sheet pasting device

By designing hydraulic push rods, cylindrical blocks, magnetic rings and alignment components in the magnetic chip patch device, the problem that traditional devices cannot effectively form magnetic steel in one piece is solved, and the alignment of the lower end of the magnetic chip and the efficient assembly of the magnetic steel is achieved.

CN222582240UActive Publication Date: 2025-03-07NANTONG GEMMA MOTOR CO LTD
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Patent Information

Application Number
CN202421211864.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-30
Publication Date
2025-03-07
Estimated Expiration
2034-05-30

AI Technical Summary

Technical Problem

Traditional magnetic chip patch devices cannot effectively patch the magnetic steel formed in one piece, resulting in the inability to align the lower end of the magnetic chip, affecting the assembly effect and production efficiency.

Method used

A magnetic chip patch device is designed, using hydraulic push rods, cylindrical blocks, magnetic rings and alignment components. Through the design of the alignment components, including a fixing seat, telescopic clips, pulley sets, drive motors, screws, positioning blocks, drive shafts, ring gears and reversing gears, the alignment and patching of the magnetic chips are achieved.

Benefits of technology

The device ensures the lower end of the magnetic sheet to be aligned by the use of the alignment components, improves the assembly efficiency of the magnetic steel and is suitable for the integrated magnetic steel use.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of magnetic steel production equipment, and discloses a magnetic sheet pasting device which comprises a machine body, a hydraulic push rod is arranged on the machine body, a cylindrical block is fixedly installed on the end portion of an output shaft of the hydraulic push rod, and a magnetic conductive ring in contact with a magnetic sheet is arranged on the cylindrical block. The diameter of the magnetic conductive ring is smaller than that of the cylindrical block, a limiting disc is arranged on the machine body, magnetic steel is arranged on the limiting disc, a cover is arranged on one side of the magnetic steel, and an opening is formed in the other side of the magnetic steel. According to the magnetic sheet pasting device, the alignment assembly is arranged below the cylindrical block used for adsorbing the magnetic sheet and the magnetic conductive ring, and in the descending process of the cylindrical block adsorbing the magnetic sheet, a pause action is added to the cylindrical block to make contact with the alignment assembly, so that the lower end of the magnetic sheet is aligned; therefore, the flatness after the magnetic sheet and the magnetic steel are attached meets the actual assembly requirement, the method is further suitable for the integrated magnetic steel, and the assembly efficiency of the whole magnetic steel is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of magnetic steel production equipment, in particular to a magnetic sheet pasting device. Background Art

[0002] The motor used in electric bicycles is generally composed of coils, magnetic steel, magnetic sheets, flywheels, bearings, cover plates, etc. Among them, magnetic sheets are attached inside the magnetic steel to generate a magnetic field.

[0003] Traditional magnets need to be covered on both sides. In order to improve the production efficiency of magnets, the cover on one side of the magnet is formed integrally with the main body, and only one side cover needs to be processed later. The existing magnetic sheet patch device is provided with structures for aligning the magnetic sheets in two areas corresponding to the upper and lower areas of the magnet. However, the integrally formed magnet cannot contact the alignment structure below it. Therefore, when the traditional magnetic sheet patch device is used to patch the magnet, it is easy to cause the lower end of the magnetic sheet to be unable to align, and it needs to be processed again, which affects the subsequent assembly effect and production efficiency of the magnet. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a magnetic sheet patch device to solve the problems mentioned in the above background.

[0005] The utility model provides the following technical solutions: a magnetic sheet pasting device, comprising: a machine body, a hydraulic push rod is arranged on the machine body, a columnar block is fixedly installed on the end of the output shaft of the hydraulic push rod, a magnetic ring in contact with the magnetic sheet is arranged on the columnar block, the diameter of the magnetic ring is smaller than the diameter of the columnar block, a limit plate is arranged on the machine body, a magnetic steel is arranged on the limit plate, a cover is arranged on one side of the magnetic steel, and the other side of the magnetic steel is an opening; an alignment component, the alignment component is arranged on the machine body, and the alignment component is used to align the magnetic sheet adsorbed on the magnetic ring, and in an initial state, the alignment component is located between the magnetic ring and the magnetic steel.

[0006] Preferably, the alignment assembly includes a fixed seat, a telescopic clamp, a pulley group, a driving motor, a screw rod, a positioning block, a transmission shaft, a ring gear, a reversing gear and a connecting plate, the fixed seat is fixedly mounted on the machine body, the telescopic clamp is slidably arranged on the fixed seat, the pulley group is movably arranged on the machine body, the driving motor is arranged on the fixed seat, the screw rod is rotatably arranged on the fixed seat and fixedly connected to the output shaft of the driving motor, the positioning block is fixedly mounted on the telescopic clamp, the transmission shaft is rotatably arranged inside the machine body, and the transmission shaft and the screw rod are transmission-connected through the pulley group, the screw rod is threadedly connected to the telescopic clamp, the ring gear is fixedly mounted on the transmission shaft, the reversing gear is rotatably arranged on the connecting plate and meshes with the ring gear, and the connecting plate is fixedly mounted on the side wall of the inner cavity of the machine body.

[0007] Preferably, two telescopic clamps are provided, the two telescopic clamps are symmetrically arranged on both sides of the magnetic conductive ring, and the two telescopic clamps are movably connected via a positioning block.

[0008] Preferably, the number of the ring gears and the number of the reversing gears are each two, the two reversing gears are meshed with each other, and a single ring gear is only meshed with a single reversing gear.

[0009] Preferably, the drive motor has forward and reverse rotation functions, and the drive motor is only connected to one of the lead screws.

[0010] Preferably, the columnar block is made of stainless steel.

[0011] Preferably, the attraction between the magnetic conductive ring and the magnetic sheet is smaller than the attraction between the magnetic steel and the magnetic sheet, and the size of the opening on the magnetic steel is larger than the size of the magnetic conductive ring and the magnetic sheet.

[0012] Preferably, the machine body is also provided with a magnetic sheet arrangement and feeding structure, a magnetic sheet clamp structure and a gluing module, the magnetic sheet clamp structure is in contact with the magnetic conductive ring, the gluing module is arranged on the side of the limiting disk, and the magnetic sheet can be adsorbed on the magnetic conductive ring through the magnetic sheet arrangement and feeding structure and the magnetic sheet clamp structure in turn.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The magnetic sheet pasting device sets an alignment component below the columnar block and the magnetic conductive ring for adsorbing the magnetic sheet, and then adds a pause action to the columnar block during the descending process of the columnar block adsorbing the magnetic sheet, so as to contact the alignment component to align the lower end of the magnetic sheet, so that the flatness of the magnetic sheet and the magnetic steel after bonding reaches the actual assembly requirement, and then the overall device can be suitable for use with integrated magnetic steel to improve the assembly efficiency of the entire magnetic steel.

[0015] 2. The magnetic sheet patch device cooperates with the reversing gear by setting a ring gear, so that the two screw rods included in the alignment component can rotate in opposite directions, thereby allowing the two telescopic clamps to slide toward each other, ensuring that the entire alignment component can align the lower end of the magnetic sheet after contacting the columnar block, thereby ensuring the rationality of the overall device to meet actual use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of another viewing angle of the overall structure of the utility model;

[0018] Figure 3 It is a partial structural cutaway diagram of the machine body of the utility model;

[0019] Figure 4 This is a schematic diagram of the reversing gear structure of the utility model;

[0020] Figure 5 This is a first schematic diagram of a magnetic sheet arrangement feeding structure in another embodiment of the utility model;

[0021] Figure 6 This is a second schematic diagram of a magnetic sheet arrangement feeding structure in another embodiment of the utility model;

[0022] Figure 7 This is a third schematic diagram of a magnetic sheet arrangement feeding structure in another embodiment of the present utility model;

[0023] Figure 8 This is a fourth schematic diagram of a magnetic sheet arrangement feeding structure in another embodiment of the present utility model;

[0024] Fig. 9 This is a schematic diagram of the magnetic sheet clamp structure in another embodiment of the utility model.

[0025] In the figure: 1. Machine body; 2. Magnetic sheet arrangement and feeding structure; 3. Magnetic sheet clamp structure; 4. Hydraulic push rod; 5. Column block; 6. Magnetic guide ring; 7. Alignment assembly; 71. Fixed seat; 72. Telescopic clamp; 73. Pulley assembly; 74. Driving motor; 75. Screw; 76. Positioning block; 77. Transmission shaft; 78. Ring gear; 79. Reversing gear; 710. Connecting plate; 8. Magnetic steel; 9. Limiting plate; 10. Gluing module. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-4A magnetic sheet patch device comprises: a body 1, a hydraulic push rod 4 is arranged on the body 1, a columnar block 5 is fixedly installed on the end of the output shaft of the hydraulic push rod 4, a magnetic ring 6 in contact with the magnetic sheet is arranged on the columnar block 5, and the diameter of the magnetic ring 6 is smaller than the diameter of the columnar block 5, a limit plate 9 is arranged on the body 1, a magnetic steel 8 is placed on the limit plate 9, a cover is arranged on one side of the magnetic steel 8, and the other side of the magnetic steel 8 is an opening; the body 1 is also provided with a magnetic sheet arrangement feeding structure 2, a magnetic sheet clamp structure 3 and a glue mold Block 10, the magnetic sheet clamp structure 3 is in contact with the magnetic ring 6, the gluing module 10 is arranged on the side of the limit plate 9, and the magnetic sheet can be adsorbed on the magnetic ring 6 through the magnetic sheet arrangement feeding structure 2 and the magnetic sheet clamp structure 3 in turn, the attraction between the magnetic ring 6 and the magnetic sheet is smaller than the attraction between the magnetic steel 8 and the magnetic sheet, and the size of the opening on the magnetic steel 8 is larger than the size of the magnetic ring 6 and the magnetic sheet, the columnar block 5 is made of stainless steel to ensure that the overall device can be used for magnetic sheet pasting of the magnetic steel 8 to meet actual use requirements.

[0028] Alignment component 7, alignment component 7 is arranged on the machine body 1, and alignment component 7 is used to align the magnetic sheet adsorbed on the magnetic ring 6. In the initial state, alignment component 7 is located between the magnetic ring 6 and the magnetic steel 8. Alignment component 7 includes a fixed seat 71, a telescopic clamp 72, a pulley group 73, a driving motor 74, a screw rod 75, a positioning block 76, a transmission shaft 77, a ring gear 78, a reversing gear 79 and a connecting plate 710. The fixed seat 71 is fixedly installed on the machine body 1, the telescopic clamp 72 is slidably arranged on the fixed seat 71, the pulley group 73 is movably arranged on the machine body 1, the driving motor 74 is arranged on the fixed seat 71, the screw rod 75 is rotatably arranged on the fixed seat 71 and fixedly connected to the output shaft of the driving motor 74, the positioning block 76 is fixedly installed on the telescopic clamp 72, the transmission shaft 77 is rotatably arranged inside the machine body 1, and the transmission shaft 77 and the screw rod 75 are transmission-connected through the pulley group 73, the screw rod 75 is threadedly connected to the telescopic clamp 72, and the ring gear 78 is threadedly connected to the telescopic clamp 72. The drive motor 74 is provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72. The plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72. The plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72. The plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72. The plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72. The plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72. The plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72. The plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72, and the plurality of retractable clamps 72 are provided with a plurality of retractable clamps 72.

[0029] Working principle: the machine body 1 is respectively provided with a magnetic sheet arrangement and feeding structure 2, a magnetic sheet clamp structure 3, a hydraulic push rod 4, a columnar block 5, a magnetic conductive ring 6 fixed to the columnar block 5, a limit plate 9 for limiting the magnetic steel 8, and a gluing module 10 for improving the tightness of the connection between the magnetic sheet and the magnetic steel 8. When performing patching, the magnetic sheet arrangement and feeding structure 2 cooperates with the magnetic sheet clamp structure 3 to adsorb the magnetic sheet on the magnetic conductive ring 6, and then the hydraulic push rod 4 is started to push the columnar block 5 to push the magnetic conductive ring 6 into the magnetic steel 8. The attraction between the magnetic steel 8 and the magnetic sheet is greater than the attraction between the magnetic conductive ring 6 and the magnetic sheet, and the magnetic sheet will be adsorbed on the inner wall of the magnetic steel 8. Then the gluing module 10 is started to apply glue to complete the bonding between the magnetic sheet and the magnetic steel 8.

[0030] During the adsorption process between the magnetic sheet and the magnetic ring 6, a step is provided between the columnar block 5 and the magnetic ring 6 to limit the top position of the magnetic sheet, and the columnar block 5 is made of stainless steel which is not magnetic. Therefore, when the magnetic sheet is adsorbed on the magnetic ring 6, the upper end of the magnetic sheet will be restricted on the magnetic ring 6. Before the magnetic ring 6 descends with the magnetic sheet, the driving motor 74 on the fixing seat 71 is started, and the screw rod 75 rotates accordingly. Figure 2 and Figure 3 The telescopic clamp 72 on the left side of the magnetic ring 6 slides on the fixed seat 71 and is also threadedly connected to the screw rod 75. Therefore, after the screw rod 75 rotates, the telescopic clamp 72 on the left side of the magnetic ring 6 slides to the right side, and the transmission shaft 77 starts to rotate under the transmission of the pulley group 73. Figure 4 The two transmission shafts 77 pass through two pairs of mutually meshing ring gears 78 and reversing gears 79, wherein the ring gear 78 is fixed on the transmission shaft 77, and the reversing gears 79 are meshed with each other. Therefore, when one of the transmission shafts 77 rotates, under the action of the ring gear 78 and the reversing gear 79, the other transmission shaft 77 rotates in the opposite direction, thereby driving the screw rod 75 on the right side of the magnetic ring 6 to rotate in the opposite direction, causing the telescopic clamp 72 on the right side of the magnetic ring 6 to slide toward the left until the two sides of the magnetic ring 6 are The telescopic clamp 72 on the left side of the magnetic ring 6 contacts to form a circular ring with an inner diameter smaller than the magnetic ring 6. At this time, the magnetic ring 6 descends and contacts the surface of the circular ring, squeezing the magnetic sheet on the magnetic ring 6 to align the lower end of the magnetic sheet, and then driving the driving motor 74 to drive the screw rod 75 to rotate in the opposite direction, so that the telescopic clamp 72 on the left side of the magnetic ring 6 slides to the left, and the telescopic clamp 72 on the right side slides to the right, so that the magnetic ring 6 passes through the telescopic clamp 72 and contacts the magnetic steel 8 below, and the magnetic sheet with the upper and lower ends of the magnetic ring 6 aligned is adsorbed and fitted on the magnetic steel 8.

[0031] The magnetic sheet arrangement and feeding structure 2, magnetic sheet clamp structure 3 and gluing module 10 mentioned in the above paragraphs can all adopt existing technical structures.

[0032] In another embodiment of the utility model, the gluing module 10 is connected by a glue spraying port, a pump, and a glue bucket through a hose, and is responsible for the gluing and fixing work after the magnetic sheet is adsorbed on the magnetic steel 8.

[0033] The magnetic sheet arrangement feeding structure 2 and the magnetic sheet clamp structure 3 are specially designed as follows:

[0034] See also Figures 5 to 8 The magnetic sheet arrangement feeding structure 2 arranges the magnetic sheets neatly on the feeding belt 205, and the feeding belt 205 can transport the magnetic sheets into the first base 201 through the opening on the first base 201. When the magnetic sheets in the front row enter the first base 201, the first electric push rod 204 in the first base 201 is started to push the partition 203 to slide downward, and the partition 203 will be inserted into the gap between the magnetic sheets in the front row and the magnetic sheets in the back row, cutting off the magnetic connection between the two, so that the magnetic sheets in the front row are located between the electric slide 202 and the partition 203, and the electric slide 202 is located in the first base 20 1, and the electric slide 202 itself carries a power device that can drive itself to slide on the first base 201. The power device adopts the existing technology, for example, an electric power pulley is adopted. By turning on and off the power, the electric slide 202 can be driven to slide on the first base 201. At this time, the electric slide 202 and the second electric push rod 207 are started again, and the electric slide 202 slides toward the outside of the first base 201, and the second electric push rod 207 pushes the feed track 208 on the guide rail 206 to slide toward the electric slide 202, and the electric slide 202 and the feed track 208 can form a temporary limit for limiting the direction of travel of the magnetic sheet. The electric slide 202 is in the process of sliding, and the driving gear 2011 is meshed with the rack 2012 fixed on the first base 201, so the driving gear 2011 will start to rotate itself as the electric slide 202 slides, and the driving gear 2011 and the transmission gear 2014 are driven by the differential gear set 2013 that moves inside the first base 201, and the transmission gear 2014 synchronously drives the worm 2015 to rotate together, and the worm 2015 is threadedly connected with the worm wheel 2016 fixed on the screw rod 209, and the screw rod 209 rotates synchronously, so that the worm 2015 that moves on the electric slide 202 and is connected with the screw rod 209 09 The push plate 2010 threadedly connected slides toward the outside of the first base 201 to push the magnetic sheet between the electric slide 202 and the partition 203, and enters into the working range of the placement machine through the temporary track formed between the electric slide 202 and the second electric push rod 207, and then performs magnetic steel placement. After the feeding is completed, the electric slide 202 slides back, causing the driving gear 2011 to rotate in the opposite direction, and under the action of the differential gear set 2013, the transmission gear 2014, the worm 2015, the worm wheel 2016 and the lead screw 209, the push plate 2010 is prompted to return to the initial position to facilitate the next feeding.

[0035] See also Fig. 9 The magnetic sheet clamp structure 3 uses the first hydraulic slide 302 to push the clamp body 306 fixed thereon to slide on the second base 301, so that the ends of the two clamp bodies 306 are in contact. At this time, the arc structure at the end of the clamp body 306 can clamp the magnetic ring 307, and the magnetic sheet being pushed to feed enters along the preset sliding direction on the clamp body 306. After the magnetic sheet feeding is completed, the second hydraulic slide 304 is started to slide toward the magnetic ring 307, wherein the push rod 303 moves on the second hydraulic slide 304 using the connecting shaft 309, and the two ends of the telescopic bar 305 are fixedly connected to the push rod 303 and the clamp body 306 respectively, and at the same time, the end of the push rod 303 away from the telescopic bar 305 is connected to the second hydraulic slide 304 using an auxiliary spring 308. Therefore, when the second hydraulic slide 304 slides, the end of the push rod 303 connected to the telescopic strip 305 slides obliquely under the restriction of the telescopic strip 305 and the connecting shaft 309, and the telescopic strip 305 will push the magnetic sheet located on the non-arc surface of the clamp body 306 to the magnetic ring 307, so that a number of magnetic sheets are surrounded and adsorbed on the magnetic ring 307. At this time, the magnetic ring 307 is contacted with the magnetic steel through other structures of the magnetic steel magnetic sheet bonding machine, so that the magnetic sheets on the magnetic ring 307 can be adsorbed inside the magnetic steel, completing the magnetic steel magnetic sheet bonding. When the first hydraulic slide 302 and the second hydraulic slide 304 restore the entire device to the initial state, under the action of the auxiliary spring 308, the push rod 303 is synchronously restored to the horizontal state to facilitate the subsequent magnetic sheet loading.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic sheet patch device, characterized in that: include: A machine body (1), wherein a hydraulic push rod (4) is arranged on the machine body (1), a columnar block (5) is fixedly mounted on the end of the output shaft of the hydraulic push rod (4), a magnetic conductive ring (6) in contact with the magnetic sheet is arranged on the columnar block (5), the diameter of the magnetic conductive ring (6) is smaller than the diameter of the columnar block (5), a limit plate (9) is arranged on the machine body (1), a magnetic steel (8) is placed on the limit plate (9), a cover is arranged on one side of the magnetic steel (8), and the other side of the magnetic steel (8) is an opening; An alignment component (7) is arranged on the machine body (1), and the alignment component (7) is used to align the magnetic sheet adsorbed on the magnetic conductive ring (6). In an initial state, the alignment component (7) is located between the magnetic conductive ring (6) and the magnetic steel (8).

2. A magnetic sheet patch device according to claim 1, characterized in that: The alignment assembly (7) comprises a fixed seat (71), a telescopic clamp (72), a pulley group (73), a driving motor (74), a screw rod (75), a positioning block (76), a transmission shaft (77), a ring gear (78), a reversing gear (79) and a connecting plate (710), wherein the fixed seat (71) is fixedly mounted on the machine body (1), the telescopic clamp (72) is slidably arranged on the fixed seat (71), the pulley group (73) is movably arranged on the machine body (1), the driving motor (74) is arranged on the fixed seat (71), and the screw rod (75) is rotatably arranged on the fixed seat (71). The drive shaft (77) is rotatably mounted inside the machine body (1), and the drive shaft (77) is connected to the lead screw (75) by a pulley group (73). The lead screw (75) is threadedly connected to the lead screw (72). The ring gear (78) is fixedly mounted on the drive shaft (77). The reversing gear (79) is rotatably mounted on the connecting plate (710) and meshes with the ring gear (78). The connecting plate (710) is fixedly mounted on the side wall of the inner cavity of the machine body (1).

3. A magnetic sheet patch device according to claim 2, characterized in that: Two telescopic clamps (72) are provided in total. The two telescopic clamps (72) are symmetrically arranged on both sides of the magnetic conductive ring (6), and the two telescopic clamps (72) are movably connected via a positioning block (76).

4. A magnetic sheet patch device according to claim 2, characterized in that: The number of the ring gears (78) and the number of the reversing gears (79) are respectively two, the two reversing gears (79) are meshed with each other, and a single ring gear (78) is only meshed with a single reversing gear (79).

5. A magnetic sheet patch device according to claim 3, characterized in that: The drive motor (74) has forward and reverse rotation functions, and the drive motor (74) is only connected to one of the lead screws (75).

6. A magnetic sheet patch device according to claim 1, characterized in that: The columnar block (5) is made of stainless steel.

7. A magnetic sheet patch device according to claim 1, characterized in that: The attraction force between the magnetic conductive ring (6) and the magnetic sheet is smaller than the attraction force between the magnetic steel (8) and the magnetic sheet, and the size of the opening on the magnetic steel (8) is larger than the size of the magnetic conductive ring (6) and the magnetic sheet.

8. A magnetic sheet patch device according to claim 1, characterized in that: The body (1) is also provided with a magnetic sheet arrangement feeding structure (2), a magnetic sheet clamp structure (3) and a gluing module (10); the magnetic sheet clamp structure (3) is in contact with the magnetic conductive ring (6); the gluing module (10) is arranged on the side of the limiting plate (9); and the magnetic sheets can be adsorbed on the magnetic conductive ring (6) in turn through the magnetic sheet arrangement feeding structure (2) and the magnetic sheet clamp structure (3).