Waste recycling equipment for silicone adhesive packaging film production

Abstract

The invention discloses waste reutilization equipment for silicone adhesive packaging film production, and relates to the technical field of plastic waste recovery treatment, the waste reutilization equipment comprises a melting tank and a heating module mounted on the melting tank, and further comprises a partition plate; the stirring mechanism comprises a main shaft and a plurality of material mixing assemblies, and each material mixing assembly comprises a plurality of stirring blades; the material control mechanism comprises a material guide plate mounted outside the plurality of stirring blades, a plurality of through grooves formed in the material guide plate, two scraping plates mounted in the through grooves, two cutting assemblies mounted in the through grooves and a linkage assembly used for driving the scraping plates to rotate; the scraping plate is driven to move towards the edge direction of the partition plate along with the material guide plate, packaging film waste materials with different melting degrees on the surfaces of the stirring blades are scraped away, and the packaging film waste materials which are not completely molten are easily attached to the outer portions of the stirring blades, so that the waste materials are easily carried to move towards the heating module; and the part of waste enters a high-temperature area close to the heating module, and melting of the part of waste is accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic waste recycling and treatment, and in particular to waste recycling equipment for silicone adhesive packaging film production. Background Art

[0002] During the production of silicone packaging film, a lot of waste will be cut off and needs to be recycled and reused. The waste must first be broken up and then melted.

[0003] The internal stirring structure of the existing melting equipment has a relatively simple function, making it difficult to achieve uniform heating and melting of waste in each area, and difficult to directionally transport unmelted waste to the high-temperature area, thereby affecting the melting efficiency of the waste. Summary of the Invention

[0004] The purpose of the present invention is to provide a waste recycling device for the production of silicone adhesive packaging film to solve the above-mentioned shortcomings in the prior art.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a waste recycling device for silicone adhesive packaging film production, comprising a melting tank and a heating module installed on the melting tank, and further comprising: a baffle rotatably connected to the interior of the melting tank; A stirring mechanism includes a main shaft rotatably connected to the interior of the melting tank and a plurality of mixing components mounted on the exterior of the main shaft. The plurality of mixing components are arranged in a circular array with the main shaft as the center. The mixing components include a plurality of stirring blades fixed to the outer wall of the main shaft along its length direction, and a partition fixedly sleeved on the exterior of the main shaft. The material control mechanism includes a material guide plate installed outside the plurality of stirring blades in the same mixing assembly, a plurality of through slots provided inside the material guide plate, two scrapers installed inside the through slots, two dividing assemblies installed inside the through slots, and a linkage assembly for driving the scrapers to rotate; The adjusting mechanism is installed on the partition plate and is used to drive the material guide plate to move.

[0006] Furthermore, a feeding cylinder is installed on the outer wall of one side of the melting tank, a sealing cover is installed on the top of the feeding cylinder, an air pipe is installed on the outer wall of the other side of the melting tank, a discharge pipe is installed at the bottom of the melting tank, and control valves are installed on both the air pipe and the discharge pipe.

[0007] Furthermore, a first motor is installed on the top of the melting tank, and an output end of the first motor is fixedly connected to the top end of the main shaft.

[0008] Furthermore, the adjustment mechanism includes a plurality of chute openings inside the partition, a reciprocating screw rotatably connected to the inside of the chute, and a drive assembly for driving the reciprocating screw to rotate; The material guide plate is slidably connected to the inside of the slide groove and is threadedly connected to the outside of the reciprocating screw.

[0009] Furthermore, the driving assembly includes a bracket mounted on the top of the partition, a sleeve shaft rotatably connected to the inside of the bracket, and a second motor mounted on the top of the bracket. The second motor is a high-temperature resistant motor, and a heat-insulating cover can be provided on the outside of the second motor. The outer portion of the second motor output shaft and the outer portion of the sleeve shaft are both fixedly sleeved with a first gear, and the two first gears are meshed with each other; The sleeve is sleeved on the outside of the main shaft, and the outside of the sleeve is fixedly sleeved with a first bevel gear. The opposite ends of the multiple reciprocating screws are fixedly sleeved with a second bevel gear, and the multiple second bevel gears are all engaged with the first bevel gear. A structural groove is opened at the top center position of the partition, and the first bevel gear and the second bevel gear are both located inside the structural groove.

[0010] Furthermore, the dividing assembly includes a plurality of fixing rods fixed to the inner wall of the through slot along the height direction thereof, and the spacing between the fixing rods on the inner wall of both sides of the through slot is the same as the thickness of the stirring blade; The distance between the two scrapers inside the through groove when they are in the same straight line is the same as the thickness of the stirring blade.

[0011] Furthermore, the linkage assembly is provided in plurality, and the linkage assembly is used to drive a plurality of scrapers on the same vertical line to rotate within a range of 90°; The linkage assembly includes a transmission shaft rotatably connected to the inside of the guide plate, a second gear mounted on the outside of the transmission shaft, and a third gear disposed below the second gear, the third gear also being mounted on the outside of the transmission shaft, the second gear and the third gear being both one-way gears; A plurality of scrapers on the same vertical line are all fixedly sleeved on the outside of the transmission shaft.

[0012] Furthermore, the linkage assembly also includes a first rack and a second rack fixedly connected to the top of the partition, the first rack is located at the edge of the top of the partition, the second rack is located on one side of the main shaft, the second gear and the first rack are located at the same horizontal height, and when the second gear moves toward the edge of the partition until it engages with the first rack, the drive shaft is driven to rotate, the third gear and the second rack are located at the same horizontal height, and when the third gear moves toward the main shaft until it engages with the second rack, the drive shaft is driven to rotate.

[0013] Compared with the prior art, the waste recycling equipment for silicone adhesive packaging film production provided by the present invention has the following beneficial effects: 1. By driving the scraper to follow the guide plate to move toward the edge of the partition, the packaging film waste with different degrees of melting on the surface of the stirring blade is scraped off to prevent the packaging film waste from adhering to the surface of the stirring blade and affecting the stirring effect. Moreover, since the packaging film waste that is not completely melted is easy to adhere to the outside of the stirring blade, when the scraper scrapes the waste on the outer wall of the stirring blade, it is easy to carry the waste toward the heating module, so that this part of the waste enters the high-temperature area close to the heating module, achieving the effect of directional conveying of the unmelted waste and accelerating the melting of this part of the waste. When the outer wall of the guide plate abuts the inner wall of the melting tank, as the stirring blade and the partition rotate, the guide plate is driven to scrape off the molten waste on the inner wall of the melting tank to prevent the molten waste from being in the high-temperature area for a long time. 2. By driving the fixed rod to follow the guide plate to move toward the main axis, the packaging film waste adhering to the outer wall of the stirring blade is separated, so that the unmelted waste in the packaging film waste is exposed, so as to accelerate the melting of the unmelted waste and further improve the efficiency of the melting treatment of the packaging film waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction to the drawings required for use in the embodiments will be given below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the melting tank of the present invention; Figure 3 This is a schematic diagram of the top structure of the partition of the present invention; Figure 4 It is a schematic diagram of the partial structure of the adjustment mechanism of the present invention; Figure 5 This is a schematic diagram of the external structure of the material guide plate of the present invention from a first perspective; Figure 6 This is a schematic diagram of the structure of the guide plate from a second perspective on the outside of the present invention; Figure 7 This is a schematic diagram of the structure distribution of the fixed rod and scraper of the present invention; Figure 8 It is a schematic diagram of the main shaft and sleeve shaft structure of the present invention.

[0016] Description of reference numerals: 1. Melting tank; 2. Heating module; 3. Partition; 4. Main shaft; 5. Stirring blade; 6. Guide plate; 7. Through trough; 8. Scraper; 9. Feeding barrel; 10. Air pipe; 11. Discharge pipe; 12. First motor; 13. Slide; 14. Reciprocating screw; 15. Bracket; 16. Sleeve; 17. Second motor; 18. First gear; 19. First bevel gear; 20. Second bevel gear; 21. Fixed rod; 22. Transmission shaft; 23. Second gear; 24. Third gear; 25. First rack; 26. Second rack. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] Example: See Figures 1-8 A waste recycling device for the production of silicone adhesive packaging film includes a melting tank 1 and a heating module 2 installed on the melting tank 1. The packaging film waste inside the melting tank 1 is melted by the heating module 2. A feeding cylinder 9 is installed on the outer wall of one side of the melting tank 1, and a sealing cover is installed on the top of the feeding cylinder 9. After the packaging film waste is crushed, it is fed into the melting tank 1 through the feeding cylinder 9. An air pipe 10 is installed on the outer wall of the other side of the melting tank 1, and a discharge pipe 11 is installed at the bottom of the melting tank 1. Control valves are installed on both the air pipe 10 and the discharge pipe 11.

[0019] Also includes: a partition 3 rotatably connected to the interior of the melting tank 1; A stirring mechanism includes a main shaft 4 rotatably connected to the inside of the melting tank 1 and a plurality of mixing components mounted on the outside of the main shaft 4. The plurality of mixing components are distributed in a circular array with the main shaft 4 as the center. In this embodiment, there are four mixing components. The mixing components include a plurality of stirring blades 5 fixed to the outer wall of the main shaft 4 along its length direction. The partition 3 is fixedly sleeved on the outside of the main shaft 4. A first motor 12 is installed on the top of the melting tank 1, and the output end of the first motor 12 is fixedly connected to the top end of the main shaft 4. By controlling the first motor 12 to drive the main shaft 4 to rotate, the stirring blades 5 outside the main shaft 4 rotate accordingly, stirring the packaging film fragments inside the melting tank 1.

[0020] The material control mechanism includes a guide plate 6 installed on the outside of multiple stirring blades 5 in the same mixing component, a plurality of through grooves 7 opened inside the guide plate 6, two scrapers 8 installed inside the through grooves 7, two dividing assemblies installed inside the through grooves 7 and a linkage assembly for driving the scraper 8 to rotate, wherein the guide plate 6 can also play a stirring role. During the reciprocating movement of the guide plate 6, the stirring effect on the waste is mentioned. Limit blocks are provided on both sides of the scraper 8, and the limit blocks are installed on the inner wall of the through groove 7. The angle between the two limit blocks is 90°, which is used to limit the rotation angle of the scraper 8 and control the scraper 8 to rotate only within a range of 90°. The dividing assembly includes a plurality of fixed rods 21 fixed to the inner wall of the through groove 7 along the height direction of the through groove 7. The fixed rod 21 is located on the side of the scraper 8 close to the main shaft 4. The spacing between the fixed rods 21 on the inner wall of the through groove 7 on both sides is the same as the thickness of the stirring blade 5; the spacing between the two scrapers 8 inside the through groove 7 when they are in the same straight line state is the same as the thickness of the stirring blade 5. The linkage assembly is provided with multiple, and the linkage assembly is used to drive The plurality of scrapers 8 on the same vertical line rotate within a range of 90°; the linkage assembly includes a transmission shaft 22 rotatably connected to the inside of the guide plate 6, a second gear 23 installed on the outside of the transmission shaft 22, and a third gear 24 arranged below the second gear 23, and the third gear 24 is also installed on the outside of the transmission shaft 22. The second gear 23 and the third gear 24 are both one-way gears. The plurality of scrapers 8 on the same vertical line are fixedly sleeved on the outside of the transmission shaft 22. The linkage assembly also includes a first rack 25 and a second rack 26 fixedly connected to the top of the partition 3. The first rack 25 is located at the edge of the top of the partition 3, and the second rack 26 is located on one side of the main shaft 4. The second gear 23 and the first rack 25 are at the same horizontal height, and when the second gear 23 moves toward the edge of the partition 3 until it meshes with the first rack 25, the transmission shaft 22 is driven to rotate. The third gear 24 and the second rack 26 are at the same horizontal height, and when the third gear 24 moves toward the main shaft 4 until it meshes with the second rack 26, the transmission shaft 22 is driven to rotate; During the stirring process of the packaging film waste, the guide plate 6 is driven to move back and forth along the length direction of the stirring blade 5. When the guide plate 6 moves toward the edge of the partition 3, the two scrapers 8 inside the through groove 7 are in the same straight line (as shown in FIG. Figure 6 and Figure 7As shown in FIG, one end of the two scrapers 8 is in contact with the outer wall of the stirring blade 5. When the two scrapers 8 follow the guide plate 6 to move toward the edge of the partition 3, the packaging film waste with different degrees of melting on the surface of the stirring blade 5 is scraped off to prevent the packaging film waste from adhering to the surface of the stirring blade 5 and affecting the stirring effect. At the same time, when the guide plate 6 moves, it can drive the waste in the middle of the melting tank 1 toward the heating module 2, so that the packaging film waste is heated evenly, thereby improving the uniformity of the melting treatment of the packaging film waste. When the second gear 23 moves to mesh with the first rack 25, the scraper 8 is driven to transmit The shaft 22 rotates 90 degrees as the center, and the scraper 8 rotates in the direction away from the fixed rod 21, so that the two scrapers 8 are set parallel to each other. Subsequently, the guide plate 6 is driven to move in the direction of the main shaft 4. At this time, the second gear 23 is also engaged with the first rack 25. Since the second gear 23 is a one-way gear, the transmission shaft 22 does not rotate accordingly. Therefore, the two scrapers 8 remain parallel, and the ends of each fixed rod 21 abut against the outer wall of the stirring blade 5. When the fixed rod 21 follows the guide plate 6 to move in the direction of the main shaft 4, the packaging film waste adhering to the outer wall of the stirring blade 5 is separated. , so that the unmelted waste in the packaging film waste is exposed, so as to accelerate the melting of the unmelted waste, and further improve the efficiency of the melting treatment of the packaging film waste. When the third gear 24 outside the transmission shaft 22 is engaged with the second rack 26, the scraper 8 is driven to rotate 90 degrees, so that the two scrapers 8 inside the through groove 7 are in the same straight line. Then, when the guide plate 6 moves toward the edge of the partition 3 again, the two scrapers 8 scrape the packaging film waste on the outer wall of the stirring blade 5, and when the third gear 24 moves toward the partition 3, it will also mesh with the second rack 26. However, since the third gear 24 is One-way gear, so the transmission shaft 22 does not rotate at this time. Since the packaging film waste that is not completely melted is more likely to adhere to the outside of the stirring blade 5, when the scraper 8 scrapes the waste on the outer wall of the stirring blade 5, it is easy to carry the waste toward the heating module 2, so that this part of the waste enters the high-temperature area close to the heating module 2, and accelerates the melting of this part of the waste. When the outer wall of the guide plate 6 abuts the inner wall of the melting tank 1, as the stirring blade 5 and the partition 3 rotate, the guide plate 6 is driven to scrape the molten waste on the inner wall of the melting tank 1 to prevent the molten waste from being in the high-temperature area for a long time.

[0021] The adjusting mechanism is installed on the partition 3 and is used to drive the guide plate 6 to move. The adjusting mechanism includes a plurality of slide grooves 13 opened inside the partition 3, a reciprocating screw 14 rotatably connected to the inside of the slide groove 13, and a driving assembly for driving the reciprocating screw 14 to rotate; the reciprocating screw 14 is a prior art. The reciprocating screw 14 is a screw that can make the guide plate 6 reciprocate without changing its rotation direction. The guide plate 6 is slidably connected to the inside of the slide groove 13 and is threadedly connected to the outside of the reciprocating screw 14. The driving assembly includes a bracket 15 installed on the top of the partition 3, a sleeve shaft 16 rotatably connected to the inside of the bracket 15, and a drive assembly installed on the bracket 15. The second motor 17 at the top adopts a high-temperature resistant motor, and a heat-insulating cover can be provided on the outside of the second motor 17; the outside of the output shaft of the second motor 17 and the outside of the sleeve shaft 16 are fixedly sleeved with a first gear 18, and the two first gears 18 are meshed with each other; the sleeve shaft 16 is sleeved on the outside of the main shaft 4, and the outside of the sleeve shaft 16 is fixedly sleeved with a first bevel gear 19, and the opposite ends of the multiple reciprocating screws 14 are fixedly sleeved with second bevel gears 20, and the multiple second bevel gears 20 are all meshed with the first bevel gear 19. A structural groove is opened at the center position of the top of the partition 3, and the first bevel gear 19 and the second bevel gear 20 are both located inside the structural groove; By controlling the second motor 17 to drive the first gear 18 outside its output shaft to rotate, the two first gears 18 are engaged with each other, which drives the sleeve shaft 16 to rotate, and the first bevel gear 19 rotates accordingly. The first bevel gear 19 is engaged with multiple second bevel gears 20 respectively, which drives each reciprocating screw 14 to rotate, and then drives the guide plate 6 to reciprocate along the inside of the slide 13.

[0022] Working principle: When in use, the main shaft 4 is driven to rotate by controlling the first motor 12, and the stirring blades 5 outside the main shaft 4 rotate accordingly, stirring the packaging film fragments inside the melting tank 1. In this process, the guide plate 6 is driven by the adjustment mechanism to move back and forth along the length direction of the stirring blade 5. When the guide plate 6 moves toward the edge of the partition 3, the two scrapers 8 inside the through groove 7 are in the same straight line state, and the opposite ends of the two scrapers 8 are in contact with the outer wall of the stirring blade 5. When the two scrapers 8 follow the guide plate 6 to move toward the edge of the partition 3, the packaging film waste with different degrees of melting on the surface of the stirring blade 5 is scraped off to prevent the packaging film waste from adhering to the surface of the stirring blade 5 and affecting the stirring effect. At the same time, when the guide plate 6 moves, it can drive the waste in the middle of the melting tank 1 toward the heating module 2, so that the packaging film waste is heated evenly, thereby improving the uniformity of the melting treatment of the packaging film waste. When the second gear 23 moves to engage with the first rack 25, the scraper 8 is driven to rotate 90° around the transmission shaft 22, and the direction of rotation of the scraper 8 is away from the fixed rod 21, so that the two scrapers 8 are arranged parallel to each other. Subsequently, the guide plate 6 is driven to move toward the direction of the main shaft 4. At this time, the second gear 23 is also engaged with the first rack 25. Since the second gear 23 is a one-way gear, the transmission shaft 22 does not rotate accordingly. Therefore, the two scrapers 8 still remain parallel. When the third gear 24 on the outside of the transmission shaft 22 is meshed with the second rack 26, the scraper 8 is driven to rotate 90 degrees, so that the two scrapers 8 inside the through groove 7 are in the same straight line. Then, when the guide plate 6 moves toward the edge of the partition plate 3 again, the two scrapers 8 scrape off the packaging film waste on the outer wall of the stirring blade 5, and the third gear 24 is engaged with the second rack 26. When it is easy to move toward the partition 3, it will also engage with the second rack 26, but since the third gear 24 is a one-way gear, the drive shaft 22 does not rotate with it at this time. Among them, since the packaging film waste that has not been completely melted is more likely to adhere to the outside of the stirring blade 5, when the scraper 8 scrapes the waste on the outer wall of the stirring blade 5, it is easy to carry the waste toward the heating module 2, so that this part of the waste enters the high-temperature area close to the heating module 2, and accelerates the melting of this part of the waste. When the outer wall of the guide plate 6 abuts the inner wall of the melting tank 1, as the stirring blade 5 and the partition 3 rotate, the guide plate 6 is driven to scrape off the molten waste on the inner wall of the melting tank 1, preventing the molten waste from being in the high-temperature area for a long time.

[0023] It should be noted that the device structure and drawings of the present invention mainly describe the principles of the present invention. In terms of the technology of this design principle, the settings of the device's power mechanism, power supply system, and control system are not fully described. However, those skilled in the art can clearly understand the details of its power mechanism, power supply system, and control system on the premise that they understand the principles of the above invention. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be implemented by simple programming by those skilled in the art. The above only describes certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present invention.

Claims

1. A waste recycling device for silicone adhesive packaging film production, comprising a melting tank (1) and a heating module (2) installed on the melting tank (1), characterized in that: Also includes: a partition (3) rotatably connected to the interior of the melting tank (1); A stirring mechanism comprising a main shaft (4) rotatably connected to the inside of the melting tank (1) and a plurality of mixing components mounted on the outside of the main shaft (4), wherein the plurality of mixing components are distributed in a ring array with the main shaft (4) as the center, the mixing components comprising a plurality of stirring blades (5) fixedly connected to the outer wall of the main shaft (4) along the length direction thereof, and a partition (3) fixedly sleeved on the outside of the main shaft (4); A material control mechanism, comprising a material guide plate (6) installed outside a plurality of stirring blades (5) in the same material mixing assembly, a plurality of through slots (7) provided inside the material guide plate (6), two scrapers (8) installed inside the through slots (7), two dividing assemblies installed inside the through slots (7), and a linkage assembly for driving the scrapers (8) to rotate; An adjusting mechanism is mounted on the partition plate (3) and is used to drive the guide plate (6) to move.

2. The waste recycling equipment for silicone adhesive packaging film production according to claim 1, characterized in that: A feeding cylinder (9) is installed on the outer wall of one side of the melting tank (1), an air pipe (10) is installed on the outer wall of the other side of the melting tank (1), and a discharge pipe (11) is installed at the bottom of the melting tank (1).

3. The waste recycling equipment for silicone adhesive packaging film production according to claim 2, characterized in that: A first motor (12) is installed on the top of the melting tank (1), and an output end of the first motor (12) is fixedly connected to the top end of the main shaft (4).

4. The waste recycling equipment for silicone adhesive packaging film production according to claim 3, characterized in that: The regulating mechanism comprises a plurality of chute grooves (13) provided inside the partition (3), a reciprocating screw (14) rotatably connected inside the chute grooves (13), and a driving assembly for driving the reciprocating screw (14) to rotate; The guide plate (6) is slidably connected to the inside of the slide groove (13) and is threadedly connected to the outside of the reciprocating screw (14).

5. The waste recycling equipment for silicone adhesive packaging film production according to claim 4, characterized in that: The driving assembly includes a bracket (15) mounted on the top of the partition (3), a sleeve shaft (16) rotatably connected to the inside of the bracket (15), and a second motor (17) mounted on the top of the bracket (15); The outside of the output shaft of the second motor (17) and the outside of the sleeve shaft (16) are both fixedly sleeved with a first gear (18), and the two first gears (18) are meshed with each other; The sleeve shaft (16) is sleeved on the outside of the main shaft (4), and a first bevel gear (19) is fixedly sleeved on the outside of the sleeve shaft (16). The opposite ends of the plurality of reciprocating screws (14) are all fixedly sleeved on the second bevel gear (20), and the plurality of second bevel gears (20) are all meshed with the first bevel gear (19).

6. The waste recycling equipment for silicone adhesive packaging film production according to claim 5, characterized in that: The splitting assembly comprises a plurality of fixing rods (21) fixed to the inner wall of the through slot (7) along its height direction, and the spacing between the fixing rods (21) on the inner walls of both sides of the through slot (7) is the same as the thickness of the stirring blade (5); The distance between the two scrapers (8) inside the through groove (7) when they are in the same straight line is the same as the thickness of the stirring blade (5).

7. The waste recycling equipment for silicone adhesive packaging film production according to claim 6, characterized in that: The linkage assembly is provided with a plurality of linkage assemblies, and the linkage assemblies are used to drive a plurality of scrapers (8) on the same vertical line to rotate within a range of 90 degrees; The linkage assembly includes a transmission shaft (22) rotatably connected to the inside of the guide plate (6), a second gear (23) mounted on the outside of the transmission shaft (22), and a third gear (24) arranged below the second gear (23), the third gear (24) also being mounted on the outside of the transmission shaft (22), and the second gear (23) and the third gear (24) are both one-way gears; The plurality of scrapers (8) on the same vertical line are all fixedly sleeved on the outside of the transmission shaft (22).

8. The waste recycling equipment for silicone adhesive packaging film production according to claim 7, characterized in that: The linkage assembly further includes a first rack (25) and a second rack (26) fixed to the top of the partition (3), wherein the first rack (25) is located at the edge of the top of the partition (3), and the second rack (26) is located on one side of the main shaft (4). The second gear (23) and the first rack (25) are located at the same horizontal height, and when the second gear (23) moves toward the edge of the partition (3) to engage with the first rack (25), the drive shaft (22) is driven to rotate. The third gear (24) and the second rack (26) are located at the same horizontal height, and when the third gear (24) moves toward the main shaft (4) to engage with the second rack (26), the drive shaft (22) is driven to rotate.

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