High-precision sleeve forming device

Abstract

The application relates to the technical field of forming equipment, and relates to a high-precision shaft sleeve forming equipment which comprises a base plate and a forming mechanism, the forming mechanism is located at the front center of the base plate, the feeding end of the forming mechanism is provided with a feeding guide groove, a plurality of groups of forming rods are arranged in the circumferential array around the forming mechanism, and the forming rods are driven through a driving mechanism; the forming mechanism comprises a bottom plate and a cover plate, the center of the bottom plate is provided with a forming cavity, a core rod is slidably arranged in the center of the forming cavity along the thickness direction of the base plate, a first forming groove is arranged on the surface of the bottom plate around the forming cavity, and a plurality of groups of cooling water interfaces are arranged around the forming cavity; the cover plate is coveringly arranged on the bottom plate, a discharging port is arranged in the center of the cover plate, a second forming groove for allowing the forming rods to slide is arranged on the side face of the cover plate, a gantry shaping sleeve is arranged outside the discharging port, and an inclined discharging groove body is arranged outside the gantry shaping sleeve. The application can improve the shaft sleeve precision, shorten the processing cycle, improve the production efficiency, and meet the integrated processing demand of the high-precision shaft sleeve.

Description

Technical Field

[0001] This application relates to the field of molding equipment technology, and in particular to a high-precision bushing molding equipment. Background Technology

[0002] In the fields of machinery manufacturing, automotive parts, and precision instruments, high-precision bushings serve as key transmission and support components. Their forming accuracy, dimensional consistency, and production efficiency directly affect the operational stability and service life of the entire machine. Currently, most mainstream bushing forming equipment on the market employs single-mold stamping or step-by-step processing techniques, which presents the following technical problems:

[0003] First, the insufficient precision of the coordinated control between the mandrel and the forming rod during the forming process can easily lead to poor smoothness and uneven wall thickness of the bushing inner wall. This is especially true for bushings with specific curvature or multi-segment structures, making it difficult to achieve precise forming in one go.

[0004] Secondly, the existing equipment lacks an efficient cooling system. The thermal deformation of the material caused by high temperature during the molding process will further reduce the product precision, and untimely cooling will also prolong the processing cycle and affect production efficiency.

[0005] Third, the drive mechanism mostly uses a single motor for direct drive, which has poor transmission stability and the sliding trajectory of the forming rod is prone to deviation. At the same time, the forming components of some equipment lack reliable limiting structures, which leads to increased wear of parts after long-term use and further shortens the service life of the equipment.

[0006] Fourth, the forming process of bushings often requires secondary processing after forming, which not only increases the production process and cost, but may also cause positioning errors due to secondary clamping, failing to meet the integrated processing requirements of high-precision bushings.

[0007] Therefore, developing a bushing forming equipment that can achieve high-precision integrated molding, has efficient cooling function and stable transmission has become the key to solving the current technical bottleneck in the industry. Utility Model Content

[0008] In order to overcome the technical problems existing in the prior art, this application provides a high-precision bushing forming equipment.

[0009] The high-precision bushing forming equipment provided in this application adopts the following technical solution:

[0010] A high-precision bushing forming device includes a substrate and a forming mechanism. The forming mechanism is located at the center of the front side of the substrate. The feeding end of the forming mechanism is provided with a feeding guide groove. A plurality of forming rods are arranged in a circular array around the forming mechanism, and the forming rods are driven by a driving mechanism. The forming mechanism includes a base plate and a cover plate. A forming cavity is formed in the center of the base plate. A mandrel is slidably mounted in the center of the forming cavity along the thickness direction of the substrate. A plurality of first forming grooves for the forming rods to slide are formed on the surface of the base plate around the forming cavity. A plurality of cooling water inlets are provided around the forming cavity. The cover plate is mounted on the base plate. A discharge port is formed in the center of the cover plate. A second forming groove for the forming rods to slide is formed on the side of the cover plate. A gantry forming sleeve is installed outside the discharge port. An inclined discharge trough is provided outside the gantry forming sleeve.

[0011] Furthermore, the mandrel includes a forming rod and auxiliary rods on both sides, and the forming rod and auxiliary rods are each driven by a separate power mechanism. The output end of the forming rod includes a forming part and a shaping part inside the forming part. The outer diameter of the forming part is smaller than that of the shaping part, and the difference between their radii is equal to the thickness of the bushing. The bottom of the auxiliary rod is horizontal with the forming rod, wherein the forming rod is a cylinder, and the bottom of the auxiliary rod on the side away from the forming rod has an arc surface with the same curvature as the outer surface of the forming rod.

[0012] Furthermore, the forming rod includes a first rod, a second rod, a third rod, a fourth rod, and a fifth rod distributed in a clockwise direction around the forming mechanism. The first rod, the second rod, the third rod, and the fifth rod are slidably installed in the first forming groove around the base plate, and the fourth rod is slidably installed in the second forming groove on the cover plate.

[0013] Furthermore, a sixth rod is slidably installed on the second rod along its length, and the sixth rod is driven by a power mechanism. The output ends of the second and fifth rods are provided with grooves that fit the upper and lower semicircles of the forming rod. The output ends of the first and third rods are provided with arc-shaped grooves that fit the bottom arc surface of the auxiliary rod. The output end of the fourth rod is provided with a groove that fits the left semicircle of the forming rod, and rectangular extension blocks are integrally formed at the two free ends of the groove.

[0014] Furthermore, the width of the forming part is the same as the width of the bushing. The thickness of the bottom plate, cover plate and gantry forming sleeve in the forming mechanism is the same as the width of the bushing. The forming part of the forming rod can pass through the discharge port in the center of the cover plate and the through hole formed by the output end of the fourth rod.

[0015] Furthermore, the second forming groove on the cover plate has two sets of horizontally distributed grooves, wherein the fourth rod adopts a frame structure, and the middle end of the fourth rod is slidably installed in the two sets of grooves of the second forming groove. A limiting plate for limiting the fourth rod is also provided outside the cover plate.

[0016] Furthermore, the drive mechanism includes a base and a drive plate slidably mounted on the base. An eccentric wheel is rotatably mounted on the base. A first fixed block and a second fixed block adapted to the eccentric wheel are mounted on the top of the drive plate. The eccentric wheel is driven by planetary gears in the base plate, and the planetary gears are driven by a sun gear. The drive shaft of the eccentric wheel passes through a strip-shaped perforation on the drive plate. The eccentric wheel is in contact with the outer surface of the first fixed block around its perimeter. An action block capable of driving the second fixed block to move is also mounted on the bottom edge of the eccentric wheel.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. This application designs the mandrel of the molding mechanism to include a molding rod and two auxiliary rods on both sides, each driven by a separate power mechanism. This enables precise control of the coordinated movement of the mandrel and the molding rod, thereby improving the smoothness of the inner wall of the bushing and ensuring uniform wall thickness. Even for bushings with specific curvature or multi-segment structures, precise molding can be achieved in one go.

[0019] 2. The several sets of cooling water interfaces arranged around the molding cavity in the molding mechanism of this application can form a high-efficiency cooling system, which can effectively reduce the thermal deformation of the material caused by high temperature during the molding process, improve product accuracy, shorten the processing cycle, and improve production efficiency.

[0020] 3. The drive mechanism in this application adopts a transmission system composed of planetary gears, sun gears and eccentric gears. Compared with direct drive by a single motor, the transmission stability is higher, which can make the sliding trajectory of the forming rod more precise. In addition, the second forming groove on the cover plate is provided with two sets of grooves, and the fourth rod adopts a frame structure and is used in conjunction with a limiting plate to form a reliable limiting structure, which can effectively reduce component wear and extend the service life of the equipment.

[0021] 4. This application includes a forming part and a shaping part at the output end of the forming rod, and a gantry shaping sleeve is installed on the outside of the cover plate outlet. The shaping process can be completed simultaneously during the forming process without secondary processing. This reduces production processes and costs, avoids positioning errors caused by secondary clamping, and meets the integrated processing requirements of high-precision bushings.

[0022] 5. In this application, when the buckles at both ends of the bushing metal raw material are initially formed, an upper and lower buckle type is used for forming and pressing connection. Compared with the straight insertion forming method, the connection structure is more stable and less likely to spring open or deform when subjected to external force, which is more conducive to the subsequent extrusion forming of the bushing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a high-precision bushing forming equipment;

[0024] Figure 2 yes Figure 1 Enlarged view of the forming mechanism;

[0025] Figure 3 yes Figure 1 Enlarged view of the drive mechanism;

[0026] Figure 4 This is the front view of a high-precision bushing forming equipment;

[0027] Figure 5 This is an exploded view of the gantry forming sleeve and the discharge trough in a high-precision bushing forming equipment;

[0028] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0029] Figure 7 This is an exploded view of the cover plate, gantry forming sleeve, and discharge trough in a high-precision bushing forming equipment.

[0030] Figure 8 yes Figure 7 Enlarged view at point B in the middle;

[0031] Figure 9 This is a schematic diagram of the metal raw material structure of the bushing.

[0032] Explanation of reference numerals in the attached drawings: 1. Substrate; 2. Molding mechanism; 3. Molding rod; 31. First rod; 32. Second rod; 33. Third rod; 34. Fourth rod; 35. Fifth rod; 36. Sixth rod; 4. Drive mechanism; 41. Base; 411. Eccentric wheel; 412. Actuating block; 42. Drive plate; 421. First fixing block; 422. Second fixing block; 5. Base plate; 51. Molding cavity; 511. First molding groove; 512. Cooling water interface; 6. Cover plate; 61. Discharge port; 62. Second molding groove; 63. Limiting plate; 7. Core rod; 71. Molding rod; 711. Molding part; 712. Shaping part; 72. Auxiliary rod; 8. Gantry shaping sleeve; 9. Discharge groove; 10. Feed guide groove. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0034] This application discloses a high-precision bushing forming equipment.

[0035] Reference Figures 1 to 9A high-precision bushing forming device includes a substrate 1 and a forming mechanism 2. The forming mechanism 2 is located at the center of the front side of the substrate 1. The feeding end of the forming mechanism 2 is provided with a feeding guide groove 10. A plurality of forming rods 3 are arranged in a circular array around the forming mechanism 2, and the forming rods 3 are driven by a driving mechanism 4. The forming mechanism 2 includes a base plate 5 and a cover plate 6. A forming cavity 51 is opened in the center of the base plate 5. A mandrel 7 is slidably installed in the center of the forming cavity 51 along the thickness direction of the substrate 1. A plurality of first forming grooves 511 for the forming rods 3 to slide are opened on the surface of the base plate 5 around the forming cavity 51. A plurality of cooling water inlets 512 are provided around the forming cavity 51. The cover plate 6 is installed on the base plate 5. A discharge port 61 is opened in the center of the cover plate 6. A second forming groove 62 for the forming rods 3 to slide is opened on the side of the cover plate 6. A gantry forming sleeve 8 is installed outside the discharge port 61. An inclined discharge groove 9 is provided outside the gantry forming sleeve 8. After the high-precision bushing forming equipment is started, the metal raw material that has been fed and stamped is first accurately conveyed to the forming cavity 51 in the center of the base plate 5 through the feeding guide groove 10 at the feeding end of the forming mechanism 2. At this time, the mandrel 7, which is slidably installed in the center of the forming cavity 51 along the thickness direction of the substrate 1, is in the initial low position, providing support and positioning for the raw material. Meanwhile, the cooling water interface 512 around the forming cavity 51 is connected to the external cooling system and is ready to be used. Subsequently, the drive mechanism 4 is activated, causing the forming rods 3 arranged in a circular array around the forming mechanism 2 to slide along their corresponding paths. The forming rods 3 on the surface of the base plate 5 move along the first forming groove 511 towards the center of the forming cavity 51. Multiple forming rods 3 work together from different directions to extrude the raw material, gradually pressing it into a preliminary bushing blank with the help of a pre-set end-fitting forming structure. The mandrel 7 maintains stable support to ensure uniform blank wall thickness. When the blank approaches the preset shape, the cooling water interface 512 sprays cooling medium into the forming area to quickly remove the heat generated by extrusion, preventing thermal deformation of the material and lubricating the forming rods 3 and mandrel 7. After preliminary forming is complete, the mandrel 7 slides forward, pushing the blank towards the discharge port 61 at the center of the cover plate 6, and slides along the second forming groove 62. The forming rod 3 assists in adjusting the posture of the blank so that it can smoothly enter the discharge port 61. At the same time, the forming rod 3 on the side of the cover plate 6 moves towards the center along the second forming groove 62, and cooperates with the discharge port 61 to further precisely form the blank of the bushing. After the blank passes through the discharge port 61, it accurately enters the outer gantry forming sleeve 8. After secondary correction on the inner wall of the forming sleeve to eliminate defects and ensure dimensional accuracy, when the next set of bushings enters the gantry forming sleeve 8, it passes through the gantry forming sleeve 8 and falls into the inclined discharge groove 9. It slides down the groove to the storage device. Then the drive mechanism 4 drives the forming rod 3 to reset, the mandrel 7 slides down to the initial low position, the cooling water interface 512 stops spraying, the equipment completes one forming cycle and enters the next cycle, realizing continuous high-precision production of bushings.

[0036] Reference Figures 1 to 9The core rod 7 includes a forming rod 71 and auxiliary rods 72 on both sides. The forming rod 71 and auxiliary rods 72 are each driven by a separate power mechanism. The output end of the forming rod 71 includes a forming part 711 and a shaping part 712 inside the forming part 711. The outer diameter of the forming part 711 is smaller than that of the shaping part 712, and the difference in their radii is equal to the thickness of the bushing. The bottom of the auxiliary rod 72 is horizontal with the forming rod 71. The forming rod 71 is cylindrical, and the bottom of the auxiliary rod 72 on the side away from the forming rod 71 has an arc surface with the same curvature as the outer surface of the forming rod 71. During bushing forming, the forming rod 71 and auxiliary rod 72 are first combined to fix the bottom of the bushing and pre-bend both ends. Then, the auxiliary rod 72 is retracted into the substrate 1, and the bushing is formed by the forming rod 71. After molding, the bushing is fitted into the molding part 711 of the molding rod 71. As the molding rod 71 is driven forward by the power mechanism, the shaping part 712 can support the back of the bushing and transfer it stably to the discharge port 61 of the cover plate 6 and the gantry shaping sleeve 8 in sequence.

[0037] Reference Figures 1 to 9The forming rod 3 includes a first rod 31, a second rod 32, a third rod 33, a fourth rod 34, and a fifth rod 35 distributed clockwise around the forming mechanism 2. The first rod 31, the second rod 32, the third rod 33, and the fifth rod 35 are slidably installed in the first forming groove 511 around the base plate 5, and the fourth rod 34 is slidably installed in the second forming groove 62 on the cover plate 6. A sixth rod 36 is slidably installed on the second rod 32 along its length and is driven by a power mechanism. The output ends of the second rod 32 and the fifth rod 35 are provided with grooves that fit the upper and lower semicircles of the forming rod 71. The output ends of the first rod 31 and the third rod 33 are provided with arc-shaped grooves that fit the bottom arc surface of the auxiliary rod 72. The output end of the fourth rod 34 is provided with a groove that fits the left semicircle of the forming rod 71, and rectangular extension blocks are integrally formed at the two free ends of the grooves. After the metal raw material is fully inserted into the forming cavity 51, the sixth rod 36 presses the metal raw material against the bottom of the forming rod 71 under the action of the power mechanism. Then the drive mechanism 4 starts to work. The first rod 31 and the third rod 33 bend the two ends of the metal raw material through the arc groove that matches the bottom arc surface of the auxiliary rod 72. Then the auxiliary rod 72 retracts into the substrate 1. The second rod 32 and the fifth rod 35 successively form the metal raw material on the forming rod 71 through the groove that matches the upper and lower semicircles of the forming rod 71. At this time, the initial forming of the bushing blank is completed. The power mechanism continues to drive the forming rod 71 to move towards the front of the substrate 1. The power mechanism is driven by a hydraulic cylinder or a pneumatic cylinder. When the forming rod 71 drives the bushing blank fitted on its forming part 711 past the cover plate 6, the fourth rod 34 extrudes and forms the bushing blank through the groove and rectangular extension block that are adapted to the left semicircle of the forming rod 71, further improving the forming accuracy of the bushing blank. The bushing blank, after being acted upon by the fourth rod 34, continues to move towards the front of the base until the bushing blank is transferred to the gantry forming sleeve 8.

[0038] Reference Figures 1 to 9 The width of the forming part 711 is the same as the width of the bushing. The thickness of the base plate 5, cover plate 6, and gantry forming sleeve 8 in the forming mechanism 2 is the same as the width of the bushing. The forming part 712 of the forming rod 71 can pass through the discharge port 61 at the center of the cover plate 6 and the through hole formed at the output end of the fourth rod 34. The second forming groove 62 on the cover plate 6 has two horizontally distributed sets of grooves. The fourth rod 34 adopts a frame structure, and its middle end is slidably installed in the two sets of grooves in the second forming groove 62. A limiting plate 63 is also provided outside the cover plate 6 to limit the movement of the fourth rod 34. The forming part 711 and the forming part 712 on the forming rod 71 work together to sequentially pass the bushing blank through the equally wide base plate 5, cover plate 6, and gantry forming sleeve 8, realizing continuous operation of the three steps of pre-forming, straightening, and shaping, and achieving integrated operation of bushing forming and shaping.

[0039] Reference Figures 1 to 9 The drive mechanism 4 includes a base 41 and a drive plate 42 slidably mounted on the base 41. An eccentric wheel 411 is rotatably mounted on the base 41. A first fixing block 421 and a second fixing block 422 adapted to the eccentric wheel 411 are mounted on the top of the drive plate 42. The eccentric wheel 411 is driven by planetary gears in the base plate 1, and the planetary gears are driven by a sun gear. The drive shaft of the eccentric wheel 411 passes through a strip-shaped perforation on the drive plate 42. The eccentric wheel 411 is in contact with the outer surface of the first fixing block 421 around its perimeter. An action block 412 capable of driving the second fixing block 422 to move is also mounted on the bottom edge of the eccentric wheel 411.

[0040] Working principle: The metal raw material after feeding and stamping enters the forming cavity 51 of the forming mechanism 2 through the feeding guide groove 10. The forming rod 71 of the mandrel 7 and the auxiliary rods 72 on both sides are kept extending out of the surface of the substrate 1 by a distance of one bushing width under the drive of their respective power mechanisms. Next, the drive mechanism 4 starts working. The sun gear in the substrate 1 drives the planetary gears, which in turn drive the eccentric wheel 411 to rotate. The drive shaft of the eccentric wheel 411 passes through the strip-shaped perforation of the drive plate 42. Its periphery is in contact with the outer surface of the first fixing block 421. The bottom edge action block 412 drives the second fixing block 422 to move, causing the drive plate 42 to slide, thereby driving the forming rod 3 to slide along the first forming groove 511 and the second forming groove 62. Specifically, after the metal raw material is completely entered into the forming cavity 51, the sixth rod 36 presses the metal raw material against the bottom of the forming rod 71 under the action of the power mechanism. Then the drive mechanism 4 starts working. The first rod 31 and the third rod 33 bend the two ends of the metal raw material through the arc groove that matches the bottom arc surface of the auxiliary rod 72. Then the auxiliary rod 72 retracts into the substrate 1. The second rod 32 and the fifth rod 35 successively form the metal raw material on the forming rod 71 through the groove that matches the upper and lower semicircles of the forming rod 71. At this time, the initial forming of the bushing blank is completed. The power mechanism continues to drive the forming rod 71 to move towards the front of the substrate 1. As the forming rod 71 carries the bushing blank fitted on its forming part 711 past the cover plate 6, the fourth rod 34, through the groove and rectangular extension block adapted to the left semicircle of the forming rod 71, extrudes and shapes the bushing blank, further improving the forming accuracy of the bushing blank. After being acted upon by the fourth rod 34, the bushing blank continues to move towards the front of the base until it is transferred into the gantry forming sleeve 8. This process is repeated until the next set of bushings is ejected when it enters the gantry forming sleeve 8 and is guided and collected by the discharge trough 9. During this process, the cooling water interface 512 around the forming cavity 51 is connected to the cooling system to efficiently cool the forming process and prevent the material from undergoing thermal deformation due to high temperature.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision bushing forming equipment, characterized in that: The system includes a substrate (1) and a molding mechanism (2), wherein the molding mechanism (2) is located at the center of the front side of the substrate (1), the feeding end of the molding mechanism (2) is provided with a feeding guide groove (10), and a plurality of molding rods (3) are arranged in a circular array around the molding mechanism (2), and the molding rods (3) are driven by a driving mechanism (4); the molding mechanism (2) includes a base plate (5) and a cover plate (6), wherein a molding cavity (51) is provided in the center of the base plate (5), and a mandrel (7) is provided in the center of the molding cavity (51) and slidably mounted along the thickness direction of the substrate (1), wherein the molding... The bottom plate (5) around the cavity (51) has several sets of first forming grooves (511) for the forming rod (3) to slide, and several sets of cooling water inlets (512) are provided around the cavity (51); the cover plate (6) is installed on the bottom plate (5), wherein the center of the cover plate (6) has a discharge port (61), the side of the cover plate (6) has a second forming groove (62) for the forming rod (3) to slide, and a gantry shaping sleeve (8) is installed outside the discharge port (61), and an inclined discharge groove body (9) is provided outside the gantry shaping sleeve (8).

2. The high-precision bushing forming equipment according to claim 1, characterized in that: The core rod (7) includes a forming rod (71) and auxiliary rods (72) on both sides, and the forming rod (71) and the auxiliary rods (72) are each driven by a separate power mechanism. The output end of the forming rod (71) includes a forming part (711) and a shaping part (712) inside the forming part (711). The outer diameter of the forming part (711) is smaller than that of the shaping part (712), and the difference between their radii is the thickness of the bushing.

3. The high-precision bushing forming equipment according to claim 2, characterized in that: The bottom of the auxiliary rod (72) is horizontal with the forming rod (71), wherein the forming rod (71) is a cylinder, and the bottom of the auxiliary rod (72) on the side away from the forming rod (71) is provided with an arc surface with the same curvature as the outer surface of the forming rod (71).

4. The high-precision bushing forming equipment according to claim 3, characterized in that: The forming rod (3) includes a first rod (31), a second rod (32), a third rod (33), a fourth rod (34), and a fifth rod (35) distributed in a clockwise direction around the forming mechanism (2). The first rod (31), the second rod (32), the third rod (33), and the fifth rod (35) are slidably installed in the first forming groove (511) around the base plate (5), and the fourth rod (34) is slidably installed in the second forming groove (62) on the cover plate (6).

5. The high-precision bushing forming equipment according to claim 4, characterized in that: The second rod (32) is slidably mounted with a sixth rod (36) along its length direction, and the sixth rod (36) is driven by a power mechanism. The output ends of the second rod (32) and the fifth rod (35) are provided with grooves that fit the upper and lower semicircles of the forming rod (71). The output ends of the first rod (31) and the third rod (33) are provided with arc-shaped grooves that fit the bottom arc surface of the auxiliary rod (72). The output end of the fourth rod (34) is provided with a groove that fits the left semicircle of the forming rod (71), and the two free ends of the groove are integrally formed with rectangular extension blocks.

6. The high-precision bushing forming equipment according to claim 5, characterized in that: The width of the forming part (711) is the same as the width of the bushing. The thickness of the bottom plate (5), cover plate (6) and gantry forming sleeve (8) in the forming mechanism (2) is the same as the width of the bushing. The forming part (712) of the forming rod (71) can penetrate the discharge port (61) in the center of the cover plate (6) and the through hole formed by the output end of the fourth rod (34).

7. The high-precision bushing forming equipment according to claim 6, characterized in that: The second forming groove (62) on the cover plate (6) is provided with two sets of grooves distributed horizontally. The fourth rod (34) adopts a frame structure, and the middle end of the fourth rod (34) is slidably installed in the two sets of grooves of the second forming groove (62). The cover plate (6) is also provided with a limiting plate (63) for limiting the fourth rod (34).

8. The high-precision bushing forming equipment according to claim 1, characterized in that: The drive mechanism (4) includes a base (41) and a drive plate (42) slidably mounted on the base (41). An eccentric wheel (411) is rotatably mounted on the base (41). A first fixing block (421) and a second fixing block (422) adapted to the eccentric wheel (411) are mounted on the top of the drive plate (42). The eccentric wheel (411) is driven by planetary gears in the base plate (1), and the planetary gears are driven by a sun gear. The drive shaft of the eccentric wheel (411) passes through a strip-shaped perforation on the drive plate (42). The eccentric wheel (411) is in contact with the outer surface of the first fixing block (421) around its perimeter. An action block (412) capable of driving the second fixing block (422) to move is also mounted on the bottom edge of the eccentric wheel (411).

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