Tension adjusting device for steel plate embossing

Abstract

The invention discloses a tension adjusting device for steel plate embossing, which belongs to the technical field of strip steel embossing and comprises an embossing machine, a tension roller frame is arranged on one side of the inlet end of the embossing machine, a swing rod support is arranged on one side, away from the embossing machine, of the tension roller frame, and a tension push rod is arranged between the swing rod support and the tension roller frame. A supporting roller frame is installed at the telescopic end of the tension push rod, a lower tension roller is rotationally installed on the supporting roller frame, an upper tension roller is rotationally installed at the upper end of the tension roller frame, and a servo tension roller is rotationally installed on the side, close to the graining machine, of the tension roller frame. A swing rod guide roller is rotationally installed at the upper end of the tension swing rod, a weight frame and an adjusting weight are installed at the lower end of the tension swing rod, torque closed-loop finishing is conducted on a wound steel plate through the servo tension roller, surface tension is stably improved through the upper tension roller and the lower tension roller, and the tension swing rod forms a mechanical integrator. And the impact of large disturbance is borne.

Description

Technical Field

[0001] This invention relates to the field of strip embossing technology, specifically a tension adjustment device for steel plate embossing. Background Technology

[0002] Embossing machines are important printing equipment for surface finishing processes. They are widely used for embossing steel plates, packaging decoration, product advertising, book covers, color box face paper, invitations and other special products. Embossing can enhance the aesthetics and decorative art effect of products and improve their grade.

[0003] During the operation of the embossing machine, the surface tension of the steel plate is the tensile force per unit width along the longitudinal direction (travel direction) at the inlet section of the embossing roller, measured in N / mm or MPa. It must exceed 10 MPa and the absolute value of the fluctuation must be less than 0.01 MPa to ensure uniform pattern depth and no cracks. The term "surface" is used because embossing deformation first occurs in the outermost fiber layer, and in engineering, "surface tension" is commonly used to refer to the tensile stress at this section.

[0004] Application document CN117696623B discloses a metal strip rolling mill and its control method, including a feeding mechanism and a rolling mill group. The rolling mill group includes a lower rolling mill and an upper rolling mill. The rolling mill also includes: a tension adjustment mechanism, including a magnetic powder clutch disposed in the feeding mechanism. Each rolling mill group is provided with a tension controller near the strip feeding direction, and the tension controller is equipped with a tension sensor; a thickness control component, which is disposed at the last rolling mill group. The lower rolling mill and the upper rolling mill are both disposed in a fixed frame with a central slot. The thickness control component includes an adjusting component rotatably mounted to the inner side wall of the fixed frame. The end of the adjusting component is connected to a wedge block with an inclined surface. The wedge block is clamped between the lower rolling mill and the upper rolling mill. The top of the upper rolling mill abuts against a limiting frame.

[0005] Based on the aforementioned patents and existing technologies, it can be concluded that existing technologies often simply use a pulling mechanism to pull and move some of the rotating rollers to adjust the tension. This often leads to problems such as untimely adjustment and excessive adjustment range. Furthermore, existing technologies often overlook the fact that the heat generated by the rotating rollers during the rotation of the strip cannot be dissipated, resulting in severe heat accumulation. This, in turn, leads to problems such as uncontrolled tension adjustment and uncontrolled embossing process. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems and deficiencies by providing a tension adjustment device for steel plate embossing, thereby improving overall work efficiency.

[0007] This invention solves at least one of the following technical problems: (1) In the prior art, a simple pulling mechanism is often used to pull and move some of the rotating rollers to adjust the tension, which often leads to problems such as untimely adjustment and excessive adjustment range; (2) Existing technologies often overlook the fact that the heat generated by the rollers during the rotation of the strip cannot be dissipated, resulting in severe heat accumulation, which in turn leads to problems such as uncontrolled tension adjustment and uncontrolled embossing process.

[0008] The objective of this invention can be achieved through the following technical solution: a tension adjusting device for steel plate embossing, comprising an embossing machine, a tension roller frame on one side of the inlet end of the embossing machine, a swing arm bracket on the side of the tension roller frame away from the embossing machine, a tension push rod between the swing arm bracket and the tension roller frame, a support roller frame installed on the telescopic end of the tension push rod, a lower tension roller rotatably installed on the support roller frame, an upper tension roller rotatably installed on the upper end of the tension roller frame, a servo tension roller rotatably installed on the side of the tension roller frame closer to the embossing machine, a tension swing arm hinged to the upper end of the swing arm bracket, a swing arm guide roller rotatably installed on the upper end of the tension swing arm, and a weight frame and adjusting weights installed on the lower end of the tension swing arm.

[0009] Preferably, an adjustment groove is provided in the lower middle part of the tension swing rod, and a swing rod slider is slidably installed in the adjustment groove. Positioning bolts are provided on both sides of the swing rod slider, and the swing rod slider is hinged to the weight frame through a hinge shaft.

[0010] Preferably, the embossing machine is equipped with support frames on both the inlet and outlet sides, and each support frame is equipped with a power roller and a driven roller.

[0011] Preferably, the support frame rises and falls with the embossing roller located on the lower side of the embossing machine. A horizontal slide is installed on the support frame, and a mounting frame is installed on the sliding end of the horizontal slide. The power roller is rotatably installed on the lower part of the support frame, and transmission pressure blocks are rotatably installed at both ends of the driven roller. The transmission pressure blocks and the mounting frame are slidably connected. An adjusting push rod is installed on the top of the mounting frame, and the telescopic end of the adjusting push rod is connected to the transmission pressure block through a transmission spring.

[0012] Preferably, the lower tension roller, upper tension roller, servo tension roller, and swing rod guide roller are all hollow structures, and each has heat-conducting fins evenly distributed in a ring array in the middle of its inner circumference.

[0013] Preferably, the inner sides of both ends of the tension lower roller, tension upper roller, servo tension roller, and rocker guide roller are provided with guide impellers with the same guiding direction.

[0014] Preferably, a transmission drum is fixedly inserted on both end faces of the tension lower roller, tension upper roller, servo tension roller, and swing rod guide roller, and a coaxial transmission shaft is provided at the axis of the transmission drum.

[0015] Preferably, a second gear is fixedly sleeved in the middle of the transmission shaft, and a number of first gears are evenly distributed in a ring array on the outer periphery of the second gear. The second gear and the first gear mesh and drive each other. The first gears are mounted on the inner periphery of the transmission cylinder through a gear bracket.

[0016] Preferably, the drive shaft is coaxial with and fixedly connected to the guide impeller, a third gear is fixedly sleeved at one end of the drive shaft outside the drive cylinder, and a fourth gear is fixedly sleeved at the end of the drive cylinder near the third gear.

[0017] Preferably, a drive motor is provided on one side of the drive drum, a support sleeve is installed at the end of the drive shaft of the drive motor, a drive rod is installed on one side of the support sleeve, a drive support shaft is installed at the end of the drive rod, the drive support shaft is parallel to the drive drum, a drive sleeve is rotatably sleeved on the drive support shaft, an internal drive gear is fixedly sleeved at one end of the drive sleeve near the fourth gear, and an external drive gear is fixedly sleeved at the other end of the drive sleeve, the internal drive gear and the fourth gear mesh with each other, and the external drive gear and the third gear mesh with each other.

[0018] The beneficial effects of this invention are: (1) During operation, the tension adjustment assembly consisting of the tension lower roller, tension upper roller, servo tension roller, and swing rod guide roller adjusts the tension of the steel plate during the embossing process, thereby reducing the fluctuation rate of the surface tension of the steel plate during the embossing process. The servo tension roller near the inlet of the embossing machine promptly acquires and adjusts the torque of the changes generated and received during the embossing process. The servo tension roller itself performs torque closed-loop fine adjustment on the wound steel plate, thereby minimizing the fluctuation of the surface tension of the steel plate at the inlet of the embossing machine, ensuring that the surface tension of the steel plate does not change during the embossing process, so that the embossing machine can emboss stably and further improve the depth of the embossed pattern and the flatness of the groove edge. The S-roll structure composed of the tension upper roller and tension lower roller controls the surface tension of the steel plate during the transportation process after uncoiling. A stable lifting process is implemented to increase the surface tension of the steel plate from the 5MPa required for straight transport to over 10MPa, meeting the operating requirements of the embossing machine. This ensures uniform depth of the embossing dots, overcomes the reverse resistance of the embossing roller dots, and prevents "slippage-shallow lines." The position of the lower tension roller is adjusted in a timely manner via a tension push rod to control the maximum surface tension of the steel plate to no more than 25MPa, suppressing micro-cracks at the edges of the embossing and resulting in accurate and neat embossing on the product. The swing guide roller bears and transmits the frictional tension generated during steel plate transport. A weight frame and adjusting weights exert an opposing force on the tension swing rod, making it a mechanical integrator that absorbs high-frequency disturbances within the displacement, stabilizing the tension input value borne by the lower tension roller within a fixed range, absorbing more than 0.1 MPa. The machine withstands the impact of MPa tension changes, absorbs high-frequency disturbances as angular displacements, and corrects long-term drift. Through the cooperation of the above processes, the tension at the inlet side of the embossing machine is improved, stabilized, and corrected in a timely manner, so that the embossing machine can emboss patterns with consistent depth and no defects. (2) During operation, the drive motor swings the drive rod, causing the internal drive gear and the fourth gear to mesh, and the external drive gear and the third gear to mesh. The internal drive gear rotates with the rotation of the fourth gear. Then the drive sleeve transmits the rotational torque and rotates the external drive gear. The third gear and the drive shaft continue to rotate, causing the guide impeller to rotate continuously, guiding the external airflow into each roller, absorbing the heat on the heat-conducting fins, and discharging the heat from the other end with the airflow, thereby controlling the temperature of each roller. The heat conduction process continues with the rotation of each roller, without the need for external power. Air is used as the refrigerant, which does not affect the rotational inertia and rotational torque of each roller. The working process is simple, reliable, and efficient. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a front view of the overall structure of the present invention; Figure 2 This is a side view of the internal structure of the tension roller of the present invention; Figure 3 This is a partial side view of the tension roller structure of the present invention; Figure 4 This is a schematic diagram of the connection structure between the internal transmission gear and the external transmission gear of the present invention; In the diagram: 101, Embossing machine; 102, Support frame; 103, Horizontal slide table; 104, Mounting frame; 105, Power roller; 106, Driven roller; 107, Transmission pressure block; 108, Adjusting push rod; 109, Transmission spring; 201, Tension roller frame; 202, Tension push rod; 203, Support roller frame; 204, Lower tension roller; 205, Upper tension roller; 206, Servo tension roller; 207, Swing rod bracket; 208, Tension swing rod; 209, Swing rod guide roller; 210, Swing rod slider; 211, Positioning bolt; 212. Hinge shaft; 213. Weight holder; 214. Adjusting weight; 215. Adjusting slide; 301. Transmission drum; 302. First gear; 303. Gear support; 304. Second gear; 305. Transmission shaft; 306. Guide impeller; 307. Third gear; 308. Fourth gear; 309. Heat-conducting fins; 310. Transmission motor; 311. Support sleeve; 312. Transmission rod; 313. Transmission support shaft; 314. Transmission sleeve; 315. Internal transmission gear; 316. External transmission gear. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0022] Please see Figure 1-4 As shown: A tension adjusting device for steel plate embossing includes an embossing machine 101. A tension roller frame 201 is provided on one side of the inlet end of the embossing machine 101. A swing rod bracket 207 is provided on the side of the tension roller frame 201 away from the embossing machine 101. A tension push rod 202 is provided between the swing rod bracket 207 and the tension roller frame 201. A support roller frame 203 is installed on the telescopic end of the tension push rod 202. A lower tension roller 204 is rotatably installed on the support roller frame 203. An upper tension roller 205 is rotatably installed on the upper end of the tension roller frame 201. A servo tension roller 206 is rotatably mounted on the side of the tension roller frame 201 near the embossing machine 101. A tension swing rod 208 is hinged to the upper end of the swing rod bracket 207. A swing rod guide roller 209 is rotatably mounted on the upper end of the tension swing rod 208. An adjustment groove 215 is provided in the middle of the lower side of the tension swing rod 208. A swing rod slider 210 is slidably mounted in the adjustment groove 215. Positioning bolts 211 are provided on both sides of the swing rod slider 210. The swing rod slider 210 is hinged to the weight frame 213 through the hinge shaft 212. In this embodiment, the surface tension fluctuation of the steel plate during embossing is reduced by the lower tension roller 204, upper tension roller 205, servo tension roller 206, and swing rod guide roller 209. The servo tension roller 206 performs torque closed-loop fine-tuning on the wound steel plate, minimizing the surface tension fluctuation at the inlet of the embossing machine 101 and ensuring that the surface tension of the steel plate remains unchanged during embossing. The upper tension roller 205 and lower tension roller 204 form an S-roll structure, which stably increases the surface tension of the steel plate during transport after uncoiling, thus ensuring the stability of the embossing machine 101. 01 The protrusion depth is uniform, overcoming the reverse resistance of the protrusion on the embossing roller. The position of the tension lower roller 204 is adjusted in time by the tension push rod 202 to suppress micro-cracks at the edge of the embossing, so that the embossing on the product is accurate and neat. The swing rod guide roller 209 bears and transmits the frictional pull generated on the swing rod guide roller 209 during the transportation of the steel plate. The weight frame 213 and the adjusting weight 214 generate opposite forces on the tension swing rod 208, so that the tension swing rod 208 forms a mechanical integrator, absorbing high-frequency disturbances in the displacement and stabilizing the tension input value borne by the tension lower roller 204 within a fixed range.

[0023] The embossing machine 101 has support frames 102 on both the inlet and outlet sides. Each support frame 102 is equipped with a power roller 105 and a driven roller 106. The support frame 102 rises and falls with the embossing roller located on the lower side of the embossing machine 101. A horizontal slide table 103 is installed on the support frame 102. A mounting frame 104 is installed on the sliding end of the horizontal slide table 103. The power roller 105 is rotatably installed on the lower part of the support frame 102. Transmission pressure blocks 107 are rotatably installed at both ends of the driven roller 106. The transmission pressure blocks 107 and the mounting frame 104 are slidably connected. An adjusting push rod 108 is installed on the top of the mounting frame 104. The telescopic end of the adjusting push rod 108 is connected to the transmission pressure block 107 through a transmission spring 109. In this embodiment, the support frame 102 causes the power roller 105 to rise and fall with the embossing roller located on the lower side of the embossing machine 101, maintaining its responsiveness. The horizontal slide table 103 is adjusted to limit the swaying changes of the steel plate during transportation, preventing the steel plate from deviating from the center line during movement. The adjustment push rods 108 on both sides press down the transmission spring 109 in a targeted manner, so that the two ends of the driven roller 106 are subjected to targeted pressure changes, preventing the steel plate from producing sickle patterns on the side during embossing, and ensuring the orderly and smooth embossing process of the steel plate.

[0024] The lower tension roller 204, upper tension roller 205, servo tension roller 206, and swing rod guide roller 209 are all hollow structures, and each has heat-conducting fins 309 evenly distributed in a ring array in the center of its inner circumference. A transmission drum 301 is fixedly inserted through both end faces of the lower tension roller 204, upper tension roller 205, servo tension roller 206, and swing rod guide roller 209. A coaxial transmission shaft 305 is provided at the axis of the transmission drum 301, and the middle of the transmission shaft 305 is fixed... A second gear 304 is fixedly fitted onto the outer circumference of the second gear 304. Several first gears 302 are evenly distributed in a circular array around the outer circumference of the second gear 304. The second gear 304 and the first gears 302 mesh and drive each other. The first gears 302 are mounted on the inner circumference of the transmission drum 301 via a gear bracket 303. Both ends of the tension lower roller 204, tension upper roller 205, servo tension roller 206, and swing rod guide roller 209 are equipped with guide impellers 306 with the same guiding direction on their inner sides. The transmission shaft 3... 05 is coaxial with and fixedly connected to the guide impeller 306. The end of the transmission shaft 305 located outside the transmission drum 301 is fixedly sleeved with a third gear 307. The end of the transmission drum 301 near the third gear 307 is fixedly sleeved with a fourth gear 308. A transmission motor 310 is provided on one side of the transmission drum 301. A support sleeve 311 is installed at the end of the drive shaft of the transmission motor 310. A transmission rod 312 is installed on one side of the support sleeve 311. A transmission support shaft 313 is installed at the end of the transmission rod 312. The transmission support shaft 313 is parallel to the transmission shaft 305. A transmission sleeve 314 is rotatably sleeved on the transmission support shaft 313. An internal transmission gear 315 is fixedly sleeved at the end of the transmission sleeve 314 near the fourth gear 308. An external transmission gear 316 is fixedly sleeved at the other end of the transmission sleeve 314. The internal transmission gear 315 and the fourth gear 308 mesh with each other. The external transmission gear 316 and the third gear 307 mesh with each other. In this embodiment, the drive motor 310 swings the drive rod 312, causing the internal drive gear 315 and the fourth gear 308 to mesh, and the external drive gear 316 and the third gear 307 to mesh. The internal drive gear 315 rotates as the fourth gear 308 rotates. Then, the drive sleeve 314 transmits the rotational torque and rotates the external drive gear 316, and continues to rotate the third gear 307 and the drive shaft 305, causing the guide impeller 306 to rotate continuously, guiding the external airflow into each roller, absorbing the heat on the heat-conducting fins 309, and discharging the heat with the airflow.

[0025] In summary, during operation, the tension adjustment assembly, consisting of the lower tension roller 204, upper tension roller 205, servo tension roller 206, and swing rod guide roller 209, regulates the tension of the steel plate during the embossing process of the embossing machine 101. This reduces the fluctuation rate of the surface tension of the steel plate during embossing. The servo tension roller 206, located near the inlet of the embossing machine 101, promptly acquires and adjusts the torque of the fluctuations generated and received during the embossing process. The servo tension roller 206 itself performs torque closed-loop fine-tuning on the wound steel plate, thereby minimizing the fluctuation of the surface tension of the steel plate at the inlet of the embossing machine 101. This ensures that the surface tension of the steel plate does not change during embossing by the embossing machine 101, allowing the embossing machine 101 to emboss stably and further improve the depth of the embossed pattern and the flatness of the groove edges. The S-roll structure formed by the upper tension roller 205 and lower tension roller 204 helps to control the surface tension fluctuations of the steel plate during transportation after uncoiling. The surface tension is steadily increased, raising it from the 5MPa required for straight transport to over 10MPa, meeting the working requirements of the embossing machine 101. This ensures uniform depth of the embossing points, overcomes the reverse resistance of the embossing rollers, and prevents slippage and shallow lines. The tension push rod 202 adjusts the position of the lower tension roller 204 in a timely manner, controlling the maximum surface tension of the steel plate to not exceed 25MPa, suppressing micro-cracks at the edges of the embossing, and ensuring accurate and neat embossing on the product. The swing guide roller 209 bears and transmits the frictional pull generated during steel plate transport. The weight frame 213 and adjusting weights 214 generate opposing forces on the tension swing rod 208, making the tension swing rod 208 a mechanical integrator that absorbs high-frequency disturbances into the displacement, stabilizing the tension input value borne by the lower tension roller 204 within a fixed range, absorbing more than 0.1 MPa. The machine withstands the impact of MPa tension changes, absorbs high-frequency disturbances as angular displacements, and corrects long-term drift. Through the cooperation of the above processes, the tension at the inlet side of the embossing machine 101 is improved, stabilized, and corrected in a timely manner, so that the embossing machine 101 can emboss patterns with consistent depth and no defects. During operation, the drive motor 310 swings the drive rod 312, causing the internal drive gear 315 and the fourth gear 308 to mesh, and the external drive gear 316 and the third gear 307 to mesh. The internal drive gear 315 rotates along with the rotation of the fourth gear 308. Subsequently, the drive sleeve 314 transmits the torque and rotates the external drive gear 316, which in turn rotates the third gear 307 and the drive shaft 305, causing the guide impeller 306 to rotate continuously. This guides the external airflow into each roller, absorbing the heat from the heat-conducting fins 309, and discharging the heat from the other end with the airflow. This controls the temperature of each roller. The heat conduction process continues as each roller rotates, requiring no external power. Using air as the refrigerant, it does not affect the rotational inertia or torque of each roller. The operation is simple, reliable, and efficient.

[0026] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A tension adjusting device for embossing steel plates, characterized in that, The device includes an embossing machine (101), with a tension roller frame (201) on one side of the inlet end of the embossing machine (101), a swing arm bracket (207) on the side of the tension roller frame (201) away from the embossing machine (101), a tension push rod (202) between the swing arm bracket (207) and the tension roller frame (201), a support roller frame (203) mounted on the telescopic end of the tension push rod (202), and a tension lower roller (204) rotatably mounted on the support roller frame (203). The upper end of the tension roller frame (201) is rotatably mounted with a tension upper roller (205), and the side of the tension roller frame (201) near the embossing machine (101) is rotatably mounted with a servo tension roller (206). The upper end of the swing arm bracket (207) is hinged with a tension swing arm (208), and the upper end of the tension swing arm (208) is rotatably mounted with a swing arm guide roller (209). The lower end of the tension swing arm (208) is mounted with a weight frame (213) and an adjusting weight (214).

2. The tension adjusting device for steel plate embossing according to claim 1, characterized in that, The tension swing rod (208) has an adjustment groove (215) in the middle of its lower side. The swing rod slider (210) is slidably installed in the adjustment groove (215). Positioning bolts (211) are provided on both sides of the swing rod slider (210). The swing rod slider (210) is hinged to the weight rack (213) through the hinge shaft (212).

3. The tension adjusting device for steel plate embossing according to claim 1, characterized in that, The embossing machine (101) is provided with support frames (102) on both the inlet and outlet sides, and each support frame (102) is provided with a power roller (105) and a driven roller (106).

4. The tension adjusting device for steel plate embossing according to claim 3, characterized in that, The support frame (102) rises and falls with the embossing roller located on the lower side of the embossing machine (101). A horizontal slide (103) is installed on the support frame (102). A mounting frame (104) is installed on the sliding end of the horizontal slide (103). A power roller (105) is rotatably installed on the lower part of the support frame (102). A transmission pressure block (107) is rotatably installed on both ends of the driven roller (106). The transmission pressure block (107) and the mounting frame (104) are slidably connected. An adjusting push rod (108) is installed on the top of the mounting frame (104). The telescopic end of the adjusting push rod (108) is connected to the transmission pressure block (107) through a transmission spring (109).

5. The tension adjusting device for steel plate embossing according to claim 1, characterized in that, The tension lower roller (204), tension upper roller (205), servo tension roller (206) and swing rod guide roller (209) are all hollow structures, and each has heat-conducting fins (309) evenly distributed in a ring array in the middle of its inner circumference.

6. The tension adjusting device for steel plate embossing according to claim 5, characterized in that, The tension lower roller (204), tension upper roller (205), servo tension roller (206), and swing rod guide roller (209) are all provided with guide impellers (306) with the same guiding direction on the inner side of both ends.

7. The tension adjusting device for steel plate embossing according to claim 6, characterized in that, The tension lower roller (204), tension upper roller (205), servo tension roller (206) and swing rod guide roller (209) are all fixedly fitted with a transmission drum (301) on both end faces, and a coaxial transmission shaft (305) is provided at the axis of the transmission drum (301).

8. The tension adjusting device for steel plate embossing according to claim 7, characterized in that, The transmission shaft (305) is fixedly sleeved with a second gear (304) in the middle. The outer circumference of the second gear (304) is provided with a number of first gears (302) evenly distributed in a ring array. The second gear (304) and the first gear (302) mesh and drive each other. The first gear (302) is installed on the inner circumference of the transmission drum (301) through a gear bracket (303).

9. A tension adjusting device for embossing steel plates according to claim 7, characterized in that, The transmission shaft (305) is coaxial with and fixedly connected to the guide impeller (306). A third gear (307) is fixedly sleeved at one end of the transmission shaft (305) outside the transmission drum (301), and a fourth gear (308) is fixedly sleeved at one end of the transmission drum (301) near the third gear (307).

10. A tension adjusting device for embossing steel plates according to claim 9, characterized in that, A drive motor (310) is provided on one side of the drive drum (301). A support sleeve (311) is installed at the end of the drive shaft of the drive motor (310). A drive rod (312) is installed on one side of the support sleeve (311). A drive support shaft (313) is installed at the end of the drive rod (312). The drive support shaft (313) and the drive shaft (305) are parallel. A drive sleeve (314) is rotatably sleeved on the drive support shaft (313). A drive internal gear (315) is fixedly sleeved at one end of the drive sleeve (314) near the fourth gear (308). A drive external gear (316) is fixedly sleeved at the other end of the drive sleeve (314). The drive internal gear (315) and the fourth gear (308) mesh with each other. The drive external gear (316) and the third gear (307) mesh with each other.

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