An automatic take-up device

Abstract

The application relates to an automatic take-up device and relates to the technical field of wire conveying, which comprises a take-up mechanism, the take-up mechanism comprises a take-up frame, a fixed guide roller, a wire groove, a first sliding groove, a sliding frame, a sliding guide roller, an elastic member, a guide rod and a sliding hole; the sliding guide roller and the elastic member are matched to facilitate the maintenance of the stability of the wire when the wire is broken, the tension of the wire is balanced with the spring force when the wire normally works, and the wire stably operates; when the wire is broken, the tension between the fixed guide roller and the sliding guide roller is reduced, at this time, the sliding guide roller moves away from the fixed guide roller under the action of the elastic force of the elastic member, so that the wire still maintains a certain tension, maintenance time is provided for the technical personnel, the wire does not need to be stopped when being broken, the continuity of the tension in the wire conveying process is ensured, and a certain tension can avoid the disorderly falling of the wire, reduces the risk of collision, winding and other injuries to surrounding personnel.

Description

Technical Field

[0001] This application relates to the field of wire transmission technology, and in particular to an automatic wire take-up device. Background Technology

[0002] In the field of wire conveying equipment, maintaining stable wire tension is a key factor in ensuring production efficiency and product quality. Traditional wire conveying systems typically employ fixed guide rollers or manual tension adjustment. However, these methods cannot respond promptly to wire breakage, leading to production line downtime or decreased product quality. In recent years, with the development of automation technology, some automatic tension control systems have been introduced. However, these systems are usually complex and costly, making them difficult to implement in small and medium-sized enterprises. Therefore, developing a simple, efficient, and low-cost automatic take-up device has become an urgent need in the industry.

[0003] In existing automatic wire reeling devices, the wires are prone to become uncontrollable and scattered disorderly when the wire breaks due to the sudden loss of tension. This not only causes the wires to become tangled and knotted, increasing the difficulty of subsequent processing and requiring the machine to be stopped for processing, thus reducing the production efficiency of the device, but may also cause the wires to collide and scratch with surrounding equipment, resulting in equipment damage. Therefore, an automatic wire reeling device is proposed. Summary of the Invention

[0004] The purpose of this application is to provide an automatic wire take-up device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic take-up device, comprising a main body mechanism, and further comprising: A take-up mechanism, located above the main body mechanism; The take-up mechanism includes a take-up frame, a fixed guide roller, a wire groove, a first slide groove, a sliding frame, a sliding guide roller, an elastic element, a guide rod, and a sliding hole. The fixed guide roller is rotatably connected to the side of the take-up frame. Several wire grooves are evenly distributed on the fixed guide roller. The first slide groove is provided on the side of the take-up frame near the fixed guide roller. The sliding frame is slidably connected inside the first slide groove. The sliding guide roller is rotatably connected to the side of the sliding frame. An elastic element is provided inside the first slide groove. A guide rod is fixedly connected inside the first slide groove. The sliding frame has a sliding hole.

[0006] Preferably, the dimensions of the fixed guide roller are adapted to the dimensions of the sliding guide roller, the dimensions of the sliding frame are adapted to the dimensions of the first slide groove, the dimensions of the sliding hole are adapted to the dimensions of the guide rod, the guide rod passes through the sliding hole, the guide rod is located inside the elastic element, a plurality of wire grooves are evenly provided on the sliding guide roller, the sliding frame is slidably connected to the guide rod through the sliding hole, the sliding guide roller extends through the inner wall of the first slide groove to the side of the take-up frame near the fixed guide roller, and the side of the sliding frame near the fixed guide roller is elastically connected to the inner wall of the first slide groove through the elastic element.

[0007] By adopting the above technical solution, technicians are given time to maintain the wires. The machine does not need to be stopped when the wire breaks, ensuring the continuity of tension during the wire transmission process. At the same time, maintaining a certain tension can prevent the wires from falling out of order, reducing the risk of collisions, entanglement and other injuries to surrounding personnel, and ensuring the safety of maintenance personnel and other on-site personnel.

[0008] Preferably, the take-up mechanism has a wire guide mechanism inside, which includes two connecting plates. Wire guide plates are fixedly connected to the sides of both connecting plates. A rotating plate is rotatably connected to the wire guide plate. A gear is fixedly connected to the side of the rotating plate. Two second sliding grooves are formed inside the take-up frame.

[0009] Preferably, the connecting plate is L-shaped, the upper and lower ends of the sliding frame are fixedly connected to the two connecting plates respectively, the guide plate is located between the sliding guide roller and the fixed guide roller, the rotating plate is located on the side of the guide plate near the sliding guide roller, the gear is located between the connecting plate and the guide plate, the size of the gear is larger than the size of the rotating shaft on the rotating plate, and the two rotating plates are respectively rotated 90° away from each other on the two guide plates.

[0010] Preferably, the guide plate extends through the inner wall of the second slide groove to the side of the take-up frame, and a plurality of guide grooves are evenly provided on the side of the two guide plates that are close to each other. The second slide groove is connected to the first slide groove, and the connecting plate is slidably connected to the second slide groove.

[0011] Preferably, the main body includes a base, the top of which is provided with a water-cooled shaping groove, and the top of which is rotatably connected with guide wheels.

[0012] Preferably, the guide wheel is located on the side of the water-cooled shaping groove, the guide wheel is located below the fixed guide roller, the bottom of the take-up frame is fixedly connected to the top of the base, the sliding guide roller is located directly above the water-cooled shaping groove, and the guide wheel is provided with a wire groove.

[0013] By adopting the above technical solutions, the conductors are constrained and guided, making it easier for technicians to quickly locate the break and preventing the conductors from continuing to deteriorate in a disordered state. This avoids the conductors becoming difficult to handle due to excessive disorder, creating favorable conditions for subsequent maintenance and restoration work. At the same time, it further reduces the probability of the conductors colliding with the equipment and reduces the degree of wear on the conductors.

[0014] Preferably, the take-up mechanism is internally provided with an air guiding mechanism located inside the lead wire mechanism. The air guiding mechanism includes a first airbag, an air guiding groove is provided inside the take-up frame, air guiding pipes are provided inside the two second sliding grooves, a limit plate is fixedly connected to the side of each of the two connecting plates that are far apart from each other, a second airbag is fixedly connected to the side of the limit plate, and a rack is fixedly connected to the side of the second airbag that is far away from the limit plate.

[0015] Preferably, the first airbag is fixedly connected to the inner wall of the first slide groove, the first airbag is located on the side of the sliding frame away from the elastic element, the side of the first airbag near the sliding frame is fixedly connected to the side of the sliding frame, the interior of the first airbag is connected to the interior of two air guide tubes through an air guide groove, and the end of the air guide tube away from the air guide groove is fixedly connected to the side of the limiting plate away from the second airbag.

[0016] Preferably, the interior of the air duct is connected to the interior of the limiting plate and the interior of the second airbag. The two racks are slidably connected to the two connecting plates on opposite sides. The two racks are located on opposite sides of the two gears. The racks are engaged with the gears on the side closer to the gears. The limiting plate and the racks are directly slidably connected to the inner wall of the second slide groove.

[0017] By adopting the above technical solutions, the conductors are constrained and guided, making it easier for technicians to quickly locate the break and preventing the conductors from continuing to deteriorate in a disordered state. This avoids the conductors becoming difficult to handle due to excessive disorder, creating favorable conditions for subsequent maintenance and restoration work. At the same time, it further reduces the probability of the conductors colliding with the equipment and reduces the degree of wear on the conductors.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, through the combination of a sliding guide roller and an elastic element, facilitates the maintenance of conductor stability in the event of a break. When the conductor is operating normally, the tension of the conductor and the spring force are balanced, ensuring stable conductor operation. When a break occurs, the tension between the fixed guide roller and the sliding guide roller decreases. At this time, the sliding guide roller moves away from the fixed guide roller under the action of the elastic element, maintaining a certain tension in the conductor. This provides technicians with maintenance time, eliminating the need to stop the machine during a break and ensuring the continuity of tension during conductor transmission. Maintaining a certain tension also prevents the conductor from scattering disorderly, reducing the risk of collisions, entanglement, and other injuries to surrounding personnel, thus ensuring the safety of maintenance personnel and other on-site personnel. 2. This invention facilitates the combing of wires by setting up a wire guide plate and wire grooves. During the movement of the sliding guide roller, the connecting plate also drives the wire guide plate to move, so that it combs the wires between the fixed guide roller and the sliding guide roller through the wire grooves. This constrains and guides the wires, making it easier for technicians to quickly find the break and preventing the wires from continuing to deteriorate in a disordered state. It also avoids the wires becoming difficult to handle due to excessive disorder, creating favorable conditions for subsequent maintenance and restoration work. At the same time, it further reduces the probability of the wires colliding with the equipment and reduces the degree of wear on the wires. 3. By setting up a rack and gear structure, pressure can be easily applied to the broken wire end. During the wire combing process, the sliding frame compresses the first airbag, allowing the gas inside to enter the second airbag through the air guide groove and air guide pipe. This causes the airbag to expand and push the rack, which in turn drives the two rotating plates to rotate towards each other. This applies pressure to the broken wire, causing it to move closer to the two rotating plates. Combined with the wire combing process, this further prevents the broken wire end from flying around, forming a more stable wire combing structure and improving the stability and reliability of the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the cross-sectional structure of the take-up mechanism; Figure 3 A schematic diagram showing the structural relationship and fit between the air guide tube and the second slide. Figure 4 This is a schematic diagram showing the structural relationship between the second slide and the limiting groove; Figure 5 This is a schematic diagram of the cross-sectional structure of the air guide groove; Figure 6 This is a schematic diagram of the three-dimensional structure of the conductor mechanism; Figure 7 This is a schematic diagram showing the structural relationship and fit between a rack and a gear.

[0020] Explanation of reference numerals in the attached drawings: 1. Take-up mechanism; 101. Take-up frame; 102. Fixed guide roller; 103. Guide wire groove; 104. First slide groove; 105. Sliding frame; 106. Sliding guide roller; 107. Elastic element; 108. Guide rod; 109. Sliding hole; 2. Guide wire mechanism; 201. Connecting plate; 202. Guide wire plate; 203. Rotating plate; 204. Gear; 205. Second slide groove; 3. Main body mechanism; 301. Base; 302. Water-cooled shaping groove; 303. Guide wheel; 4. Air guiding mechanism; 401. First airbag; 402. Air guiding groove; 403. Air guiding pipe; 404. Limiting plate; 405. Second airbag; 406. Rack. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 This application will be described in further detail below.

[0022] An automatic reel-in device includes a main body mechanism 3, and further includes: The take-up mechanism 1 is located above the main body mechanism 3; The take-up mechanism 1 includes a take-up frame 101, a fixed guide roller 102, a wire guide groove 103, a first slide groove 104, a sliding frame 105, a sliding guide roller 106, an elastic element 107, a guide rod 108, and a sliding hole 109. The fixed guide roller 102 is rotatably connected to the side of the take-up frame 101. Several wire guide grooves 103 are evenly opened on the fixed guide roller 102. The first slide groove 104 is opened on the side of the take-up frame 101 near the fixed guide roller 102. The sliding frame 105 is slidably connected inside the first slide groove 104. The sliding guide roller 106 is rotatably connected to the side of the sliding frame 105. An elastic element 107 is provided inside the first slide groove 104. The guide rod 108 is fixedly connected inside the first slide groove 104. The sliding hole 109 is opened on the sliding frame 105.

[0023] The dimensions of the fixed guide roller 102 are adapted to the dimensions of the sliding guide roller 106, the dimensions of the sliding frame 105 are adapted to the dimensions of the first groove 104, the dimensions of the sliding hole 109 are adapted to the dimensions of the guide rod 108, the guide rod 108 passes through the sliding hole 109, and the guide rod 108 is located inside the elastic member 107. Several wire grooves 103 are evenly provided on the sliding guide roller 106. The sliding frame 105 is slidably connected to the guide rod 108 through the sliding hole 109. The sliding guide roller 106 extends through the inner wall of the first groove 104 to the side of the take-up frame 101 near the fixed guide roller 102. The side of the sliding frame 105 near the fixed guide roller 102 is elastically connected to the inner wall of the first groove 104 through the elastic member 107.

[0024] The take-up mechanism 1 has a wire guide mechanism 2 inside. The wire guide mechanism 2 includes two connecting plates 201. Wire guide plates 202 are fixedly connected to the sides of both connecting plates 201. A rotating plate 203 is rotatably connected to the wire guide plate 202. A gear 204 is fixedly connected to the side of the rotating plate 203. Two second sliding grooves 205 are opened inside the take-up frame 101.

[0025] The above solution, through the cooperation of structures such as the sliding guide roller 106 and the elastic element 107, facilitates the maintenance of conductor stability when the wire breaks. When the conductor is working normally, the tension of the conductor and the spring force are balanced, and the conductor runs stably. When a wire breaks, the tension between the fixed guide roller 102 and the sliding guide roller 106 decreases. At this time, the sliding guide roller 106 will move away from the fixed guide roller 102 under the action of the elastic element 107, so that the conductor still maintains a certain tension, providing technicians with maintenance time. There is no need to stop the machine when the wire breaks, ensuring the continuity of tension during the conductor transmission process. Maintaining a certain tension can also prevent the conductor from falling out of order, reducing the risk of collision, entanglement and other injuries to surrounding personnel, and ensuring the safety of maintenance personnel and other on-site personnel. By combining the wire guide plate 202 and the wire guide groove 103, the wire is easily combed. During the movement of the sliding guide roller 106, the connecting plate 201 also drives the wire guide plate 202 to move, so that it combs the wire between the fixed guide roller 102 and the sliding guide roller 106 through the wire guide groove 103. This constrains and guides the wire, making it easier for technicians to quickly find the break and prevent the wire from continuing to deteriorate in a disordered state. It also avoids the wire from becoming too messy to handle, creating favorable conditions for subsequent maintenance and restoration work. At the same time, it further reduces the probability of the wire colliding with the equipment and reduces the degree of wear on the wire.

[0026] like Figures 4 to 7 As shown, the connecting plate 201 is L-shaped. The upper and lower ends of the sliding frame 105 are fixedly connected to the two connecting plates 201 respectively. The guide plate 202 is located between the sliding guide roller 106 and the fixed guide roller 102. The rotating plate 203 is located on the side of the guide plate 202 close to the sliding guide roller 106. The gear 204 is located between the connecting plate 201 and the guide plate 202. The size of the gear 204 is larger than the size of the rotating shaft on the rotating plate 203. The two rotating plates 203 are respectively rotated 90° on the two guide plates 202 in a direction away from each other.

[0027] The wire guide plate 202 extends through the inner wall of the second slide groove 205 to the side of the take-up frame 101. Several wire grooves 103 are evenly opened on the side of the two wire guide plates 202 that are close to each other. The second slide groove 205 is connected to the first slide groove 104. The connecting plate 201 is slidably connected to the second slide groove 205. The main body mechanism 3 includes a base 301. A water-cooled shaping groove 302 is provided on the top of the base 301. A guide wheel 303 is rotatably connected to the top of the base 301.

[0028] The guide wheel 303 is located on the side of the water-cooled shaping tank 302 and below the fixed guide roller 102. The bottom of the take-up frame 101 is fixedly connected to the top of the base 301. The sliding guide roller 106 is located directly above the water-cooled shaping tank 302. The guide wheel 303 is provided with a wire groove 103.

[0029] The take-up mechanism 1 is equipped with an air guiding mechanism 4, which is located inside the wire guide mechanism 2. The air guiding mechanism 4 includes a first airbag 401, an air guiding groove 402 is opened inside the take-up frame 101, and air guiding pipes 403 are provided inside the two second sliding grooves 205. A limit plate 404 is fixedly connected to the side of the two connecting plates 201 that is far away from each other. A second airbag 405 is fixedly connected to the side of the limit plate 404, and a rack 406 is fixedly connected to the side of the second airbag 405 that is far away from the limit plate 404.

[0030] The first airbag 401 is fixedly connected to the inner wall of the first slide groove 104. The first airbag 401 is located on the side of the sliding frame 105 away from the elastic element 107. The side of the first airbag 401 near the sliding frame 105 is fixedly connected to the side of the sliding frame 105. The interior of the first airbag 401 is connected to the interior of the two air pipes 403 through the air guide groove 402. The end of the air pipe 403 away from the air guide groove 402 is fixedly connected to the side of the limiting plate 404 away from the second airbag 405. The interior of the air pipe 403 passes through the limiting plate 404 and is connected to the interior of the second airbag 405. The two racks 406 are slidably connected to the sides of the two connecting plates 201 away from each other. The two racks 406 are located on the sides of the two gears 204 away from each other. The side of the rack 406 near the gear 204 meshes with the gear 204. The limiting plate 404 and the racks 406 are directly slidably connected to the inner wall of the second slide groove 205.

[0031] The above solution facilitates the application of pressure to the broken wire end by setting up a structure such as rack 406 and gear 204. During the wire combing process, the sliding frame 105 compresses the first airbag 401, allowing the gas inside to enter the second airbag 405 through the air guide groove 402 and air guide pipe 403, causing it to expand and push the rack 406. This causes the gear 204, which meshes with the rack, to drive the two rotating plates 203 to rotate towards each other, applying pressure to the broken wire and causing it to move closer to the two rotating plates 203. Combined with the combing of the wire plate 202, this further prevents the broken wire end from flying around randomly, forming a more stable wire combing structure and improving the stability and reliability of the system.

[0032] The working principle and usage process of this invention are as follows: First, the wire, after being water-cooled and shaped in the water-cooled shaping groove 302, is repeatedly wound around the wire groove 103 and the sliding guide roller 106 via the guide roller 303, allowing it to pass through the wire groove 103, the sliding guide roller 106, and the wire groove 103 on the wire plate 202. During the winding process, the wire is tightened, and the stress drives the sliding guide roller 106 to move closer to the fixed guide roller 102, squeezing the elastic element 107 and pulling the first airbag 401, and causing the connecting plate 201 to slide inside the second sliding groove 205. The air duct 403 is contracted, and the first airbag 401 is expanded. The air duct 402 and the air duct 403 draw away the gas in the second airbag 405. This causes the rack 406 to move closer to the limiting plate 404, which in turn drives the gear 204 to rotate the two rotating plates 203 away from each other. Finally, the wound wire is connected to the external take-up roller, and the take-up roller is rotated by the external power source to take up the wire. At this time, the tension of the wire is balanced with the elastic force of the elastic element 107, and the wire runs stably. When a wire breakage occurs, the tension between the fixed guide roller 102 and the sliding guide roller 106 decreases. At this time, the sliding guide roller 106 will move away from the fixed guide roller 102 under the action of the elastic force of the elastic element 107, so that the wire still maintains a certain tension, providing technicians with maintenance time. Simultaneously, during the movement of the sliding guide roller 106, the connecting plate 201 will also drive the guide plate 202 to move, so that it can comb the wire between the fixed guide roller 102 and the sliding guide roller 106 through the guide groove 103, thereby constraining and guiding the wire. During the combing process of the guide plate 202, the sliding frame 105 will compress the first airbag 401, so that the gas inside it can enter the second airbag 405 through the air guide groove 402 and the air guide pipe 403, causing it to expand and push the rack 406, so that the gear 204 meshing with it can drive the two rotating plates 203 to rotate in a direction closer to each other, applying pressure to the broken wire and causing it to move closer to the two rotating plates 203, which is in conjunction with the combing of the guide plate 202.

[0033] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic take-up device, comprising a main body mechanism (3), characterized in that: Also includes: The take-up mechanism (1) is located above the main body mechanism (3); The take-up mechanism (1) includes a take-up frame (101), a fixed guide roller (102), a wire groove (103), a first slide groove (104), a sliding frame (105), a sliding guide roller (106), an elastic element (107), a guide rod (108), and a sliding hole (109). The side of the take-up frame (101) is rotatably connected to the fixed guide roller (102). Several wire grooves (103) are evenly opened on the fixed guide roller (102). The side of the take-up frame (101) near the fixed guide roller (102) is provided with a first slide groove (104). The sliding frame (105) is slidably connected inside the first slide groove (104). The side of the sliding frame (105) is rotatably connected to the sliding guide roller (106). An elastic element (107) is provided inside the first slide groove (104). A guide rod (108) is fixedly connected inside the first slide groove (104). A sliding hole (109) is opened on the sliding frame (105). The take-up mechanism (1) is equipped with a wire guide mechanism (2) inside. The wire guide mechanism (2) includes two connecting plates (201). The sides of the two connecting plates (201) are fixedly connected to wire guide plates (202). A rotating plate (203) is rotatably connected to the wire guide plate (202). A gear (204) is fixedly connected to the side of the rotating plate (203). The take-up frame (101) has two second sliding grooves (205) inside. The connecting plate (201) is L-shaped. The upper and lower ends of the sliding frame (105) are fixedly connected to the two connecting plates (201) respectively. The guide plate (202) is located between the sliding guide roller (106) and the fixed guide roller (102). The rotating plate (203) is located on the side of the guide plate (202) close to the sliding guide roller (106). The gear (204) is located between the connecting plate (201) and the guide plate (202). The size of the gear (204) is larger than the size of the rotating shaft on the rotating plate (203). The two rotating plates (203) rotate 90° away from each other on the two guide plates (202). The wire guide plate (202) extends through the inner wall of the second slide groove (205) to the side of the take-up frame (101). Several wire grooves (103) are evenly opened on the side of the two wire guide plates (202) that are close to each other. The second slide groove (205) is connected to the first slide groove (104). The connecting plate (201) is slidably connected to the second slide groove (205). The main structure (3) includes a base (301), a water-cooled shaping groove (302) is provided on the top of the base (301), and a guide wheel (303) is rotatably connected to the top of the base (301). The guide wheel (303) is located on the side of the water-cooled shaping groove (302), and the guide wheel (303) is located below the fixed guide roller (102). The bottom of the take-up frame (101) is fixedly connected to the top of the base (301). The sliding guide roller (106) is located directly above the water-cooled shaping groove (302). The guide wheel (303) is provided with a wire groove (103).

2. The automatic take-up device according to claim 1, characterized in that: The dimensions of the fixed guide roller (102) are adapted to the dimensions of the sliding guide roller (106), the dimensions of the sliding frame (105) are adapted to the dimensions of the first slide groove (104), the dimensions of the sliding hole (109) are adapted to the dimensions of the guide rod (108), the guide rod (108) passes through the sliding hole (109), the guide rod (108) is located inside the elastic member (107), a plurality of wire grooves (103) are evenly provided on the sliding guide roller (106), the sliding frame (105) is slidably connected to the guide rod (108) through the sliding hole (109), the sliding guide roller (106) extends through the inner wall of the first slide groove (104) to the side of the take-up frame (101) near the fixed guide roller (102), the side of the sliding frame (105) near the fixed guide roller (102) is elastically connected to the inner wall of the first slide groove (104) through the elastic member (107).

3. The automatic take-up device according to claim 1, characterized in that: The take-up mechanism (1) is provided with an air guiding mechanism (4) inside. The air guiding mechanism (4) is located inside the wire guide mechanism (2). The air guiding mechanism (4) includes a first airbag (401). The take-up frame (101) is provided with an air guiding groove (402). The two second slide grooves (205) are each provided with an air guiding pipe (403). The two connecting plates (201) are fixedly connected to a limiting plate (404) on the side away from each other. The side of the limiting plate (404) is fixedly connected to a second airbag (405). The side of the second airbag (405) away from the limiting plate (404) is fixedly connected to a rack (406).

4. The automatic take-up device according to claim 3, characterized in that: The first airbag (401) is fixedly connected to the inner wall of the first slide groove (104). The first airbag (401) is located on the side of the sliding frame (105) away from the elastic member (107). The side of the first airbag (401) close to the sliding frame (105) is fixedly connected to the side of the sliding frame (105). The interior of the first airbag (401) is connected to the interior of two air guide tubes (403) through the air guide groove (402). The end of the air guide tube (403) away from the air guide groove (402) is fixedly connected to the side of the limiting plate (404) away from the second airbag (405).

5. The automatic take-up device according to claim 3, characterized in that: The interior of the air duct (403) is connected to the interior of the limiting plate (404) and the interior of the second airbag (405). The two racks (406) are slidably connected to the two connecting plates (201) on opposite sides. The two racks (406) are located on opposite sides of the two gears (204). The side of the rack (406) closest to the gear (204) meshes with the gear (204). The limiting plate (404) and the racks (406) are both directly slidably connected to the inner wall of the second groove (205).

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