Eccentric sleeve riveting and pressing assembly machine

Abstract

The utility model discloses an eccentric wheel sleeve riveting pressure assembly machine, specifically relates to eccentric wheel riveting technical field, including control box, the upper end of control box is installed with workbench board, is provided with the frame body mechanism on workbench board, is provided with servo electric jar mechanism on frame body mechanism, and the frame height end of frame body mechanism is connected with servo electric jar mechanism, is provided with the riveting head on servo electric jar mechanism, and the output of servo electric jar mechanism is connected with riveting head, and the outside of riveting head is provided with the chamfer surface, and the lower end of riveting head is installed with the positioning cylinder, is provided with the positioning mechanism on workbench board, and the lower end of control box is installed with the support foot in rectangle. The utility model discloses through the accurate cooperation of positioning structure and riveting head realizes workpiece fast alignment, and servo closed loop structure accurately controls the riveting depth and pressure, and the problem of bearing jamming and part loosening is radically solved, and integrated automation process and stable frame body, and the production efficiency and assembly quality are greatly improved, and the efficient and stable production of precision eccentric wheel sleeve is realized.

Description

Technical Field

[0001] This utility model relates to the field of eccentric wheel riveting technology, and more specifically, to an eccentric wheel sleeve riveting assembly machine. Background Technology

[0002] With the rapid development of textile machinery, the demand for products is surging, and there is also a greater need for improvement in other aspects. In terms of product manufacturing processes, independent innovation needs to be further enhanced in order to improve the assembly efficiency of yarn feeders and reduce labor costs.

[0003] Common eccentric wheel and sleeve riveting assembly machines can only connect eccentric wheels and sleeves by pressing down. However, in actual production, due to the uncertainty of manual labor and the high demand for basic parts, the eccentric wheels and sleeves may be pressed too deeply during the connection process, causing the bearing to jam and not rotate, or too shallowly, causing the bearing to loosen and fall off. Furthermore, every step from loading to positioning to unloading requires manual operation, ultimately resulting in increased labor intensity, reduced production efficiency, and reduced product quality.

[0004] In summary, in order to overcome the uncertainties of manual labor and the high demand for basic components, it is necessary to solve the problems of reduced production efficiency and quality, thereby significantly improving labor productivity. With each workstation operating at the same time, workers can be freed from conventional manual labor, improving production efficiency and reducing labor intensity. Furthermore, the use of various high-precision guiding, positioning, feeding, adjustment, detection, and vision systems or components can ensure high precision in product assembly and production. Utility Model Content

[0005] The present invention provides an eccentric wheel sleeve riveting assembly machine, which aims to solve the following problems: the uncertainty of manual operation and the high demand for parts lead to the problem of excessive or shallow pressing when assembling eccentric wheels and eccentric sleeves, and each process needs to be completed manually, resulting in high labor intensity, low efficiency and poor quality.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an eccentric wheel sleeve riveting assembly machine, comprising a control box, a worktable mounted on the upper end of the control box, a frame mechanism mounted on the worktable, a servo electric cylinder mechanism mounted on the frame mechanism, the upper end of the frame mechanism connected to the servo electric cylinder mechanism, a riveting head mounted on the servo electric cylinder mechanism, the output end of the servo electric cylinder mechanism connected to the riveting head, a chamfered surface on the outer side of the riveting head, a positioning cylinder mounted on the lower end of the riveting head, a positioning mechanism mounted on the worktable, a rectangular support foot mounted on the lower end of the control box, multiple inlet holes of different sizes on the surface of the control box, and a protective door mounted on the surface of the control box.

[0007] In a preferred embodiment, the frame mechanism is used to mount the servo cylinder mechanism at a high position. The frame mechanism includes a stabilizing component and a raising component. The connecting end of the stabilizing component is connected to the raising component, and the stabilizing component is used to support the raising component. The mounting end of the raising component is connected to the servo cylinder mechanism, and the raising component is used to increase the height of the servo cylinder mechanism.

[0008] In a preferred embodiment, the stabilizing component includes two support base plates mounted on the upper part of the workbench and a reinforcing plate mounted on the upper part of the support base plates.

[0009] In a preferred embodiment, the escalator assembly includes an escalator plate mounted on the upper end of a support base plate and an mounting plate mounted on the upper end of the escalator plate, with a reinforcing plate fixedly connected to the escalator plate.

[0010] In a preferred embodiment, a servo electric cylinder mechanism is used to control the lifting and lowering movement of the riveting head. The servo electric cylinder mechanism includes a lifting component and a power component. The output end of the lifting component is connected to the riveting head, and the lifting component is used to control the lifting and lowering movement of the riveting head. The output end of the power component is connected to the lifting component, and the power component is used to provide lifting and lowering power to the lifting component.

[0011] In a preferred embodiment, the lifting assembly includes an electric cylinder housing mounted on the upper end of a mounting plate, a lifting cylinder mounted inside the electric cylinder housing, and a threaded rod mounted inside the electric cylinder housing. The threaded rod is threadedly connected to the lifting cylinder, the lifting cylinder is slidably connected to the electric cylinder housing, and the lower end of the lifting cylinder is connected to a riveting head.

[0012] In a preferred embodiment, the power assembly includes a linkage box mounted on the upper end of the electric cylinder housing, a top cover mounted on the upper end of the linkage box, a motor mounted on the lower end of the linkage box, and a belt disposed inside the linkage box, the belt being sleeved on the outside of the motor output end and the threaded rod input end.

[0013] In a preferred embodiment, the positioning mechanism is used to limit the processing position of the workpiece. The positioning mechanism includes a plug-in component and a workpiece component. The limiting end of the plug-in component is connected to the workpiece component. The plug-in component is used to limit the processing position of the workpiece component. The workpiece component is used to be pressurized and joined into a whole.

[0014] In a preferred embodiment, the plug-in assembly includes a positioning seat mounted on the upper end of the workbench, a positioning disk mounted on the upper end of the positioning seat, and a positioning block mounted on the upper end of the positioning disk.

[0015] In a preferred embodiment, the workpiece assembly includes an eccentric kit disposed on the upper end of the positioning plate, a bearing disposed on the outside of the eccentric kit, and an eccentric wheel disposed on the outside of the bearing, with the positioning block inserted into the interior of the eccentric kit.

[0016] The beneficial effects of this utility model are as follows: This invention utilizes a precise positioning cylinder at the lower end of the riveting head and a chamfered surface for outer guidance, along with a precise positioning mechanism consisting of a positioning plate and positioning blocks on the worktable, to ensure that eccentric components, bearings, and eccentric wheels can be automatically, quickly, and accurately positioned before riveting, achieving a tight alignment and greatly reducing placement errors and wasted time.

[0017] This invention provides precise and controllable downward pressure and displacement through a closed-loop control structure consisting of a motor, belt, threaded rod, and lifting cylinder inside the servo electric cylinder mechanism. This ensures that the depth and force of the riveting head are just right each time it is pressed down, preventing the bearing from jamming due to excessive pressure or the parts from loosening and falling off due to insufficient pressure. This completely solves the problem of difficulty in controlling the force and depth during manual operation, significantly reducing the defect rate and ensuring stable and reliable assembly quality for every product.

[0018] This utility model integrates positioning and riveting actions into an automated process. With a stable frame mechanism and efficient transmission design, it achieves a rapid cycle from loading and riveting to resetting and unloading. This frees workers from conventional manual labor, allowing them to engage in more creative work, significantly reducing labor intensity, improving production efficiency, and making the production of such precision eccentric wheel kits easy and efficient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the frame mechanism of this utility model.

[0021] Figure 3 This is an exploded view of the servo electric cylinder mechanism of this utility model.

[0022] Figure 4 This is a schematic diagram of the press-fit structure of this utility model.

[0023] Figure 5 This is an exploded view of the positioning mechanism of this utility model.

[0024] The attached diagram is labeled as follows: 1. Control box; 11. Workbench; 12. Riveting head; 13. Chamfered surface; 14. Positioning cylinder; 15. Support leg; 16. Cable inlet; 17. Protective door; 211. Support base plate; 212. Reinforcing plate; 221. Elevating plate; 222. Mounting plate; 311. Electric cylinder housing; 312. Lifting cylinder; 313. Threaded rod; 321. Linkage box; 322. Top cover; 323. Motor; 324. Belt; 411. Positioning seat; 412. Positioning disc; 413. Positioning block; 421. Eccentric assembly; 422. Bearing; 423. Eccentric wheel. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Refer to the instruction manual appendix Figures 1 to 5 An eccentric wheel sleeve riveting assembly machine includes a control box 1, a workbench 11 mounted on the upper end of the control box 1, a frame mechanism mounted on the workbench 11, a servo electric cylinder mechanism mounted on the frame mechanism, the upper end of the frame mechanism connected to the servo electric cylinder mechanism, a riveting head 12 mounted on the servo electric cylinder mechanism, the output end of the servo electric cylinder mechanism connected to the riveting head 12, a chamfered surface 13 on the outer side of the riveting head 12, a positioning cylinder 14 mounted on the lower end of the riveting head 12, a positioning mechanism mounted on the workbench 11, a rectangular support foot 15 mounted on the lower end of the control box 1, multiple inlet holes 16 of different sizes on the surface of the control box 1, and a protective door 17 mounted on the surface of the control box 1.

[0027] It should be noted that the control box 1 is the core control unit of the entire equipment, which houses the electrical control system, such as PLC and servo drive. Intermediate relays, AC contactors, circuit breakers, routers, and sensors in the circuit output or input different signals to the PLC. The workbench 11 serves as the installation base, supporting all actuators. The support feet 15 provide stable support to ensure smooth operation of the equipment. Its rectangular distribution enhances the overall rigidity. The cable entry holes 16 of different sizes facilitate the introduction of cables of different specifications, such as power cables, control cables, and signal cables. The protective door 17 facilitates debugging, inspection, and maintenance of the inside of the control box 1. The positioning cylinder 14 at the end of the riveting head 12 is used to precisely guide the riveting head 12 to align with the center hole of the eccentric kit 421 to be assembled.

[0028] It is worth noting that the chamfered surface 13 on the outer side of the press head 12 is very critical. During the press riveting process, it guides the bearing 422 and the eccentric wheel 423 to smoothly fit into the eccentric kit 421 and participates in the riveting process on the eccentric wheel 423 to form a firm connection.

[0029] Refer to the instruction manual appendix Figures 1 to 2 The frame mechanism is used to mount the servo electric cylinder mechanism at a high position. The frame mechanism includes a stabilizing component and a raising component. The connecting end of the stabilizing component is connected to the raising component, and the stabilizing component is used to support the raising component. The mounting end of the raising component is connected to the servo electric cylinder mechanism, and the raising component is used to increase the height of the servo electric cylinder mechanism.

[0030] It should be noted that the main function of the frame mechanism is to provide a high and stable mounting platform for the servo electric cylinder mechanism, ensuring that its output shaft can act vertically on the positioning mechanism on the worktable 11. The stabilizing component is responsible for resisting the downward pressure and possible vibration generated during the riveting process, while the lifting component raises the servo electric cylinder mechanism to a suitable working height according to process requirements.

[0031] Refer to the instruction manual appendix Figure 2 The stabilizing components include two support base plates 211 mounted on the upper end of the workbench 11 and a reinforcing plate 212 mounted on the upper end of the support base plates 211.

[0032] It should be noted that the support base plate 211 is firmly installed on the workbench plate 11 by bolts and other fasteners, providing the main load-bearing foundation. The reinforcing plate 212 is welded to the upper end face of the support base plate 211, and its function is to significantly increase the ability of the support base plate 211 to resist bending moment and lateral force, and prevent it from deforming or shaking under the impact of riveting.

[0033] Refer to the instruction manual appendix Figure 2 The raised platform assembly includes a raised platform 221 installed on the upper end of the support base plate 211 and a mounting plate 222 installed on the upper end of the raised platform 221. The reinforcing plate 212 is fixedly connected to the raised platform 221.

[0034] It should be noted that the raised plate 221 is the main vertical support component. Its lower end is fixed to the support base plate 211, and its upper end supports the mounting plate 222. The mounting plate 222 provides a flat surface for mounting and fixing the servo electric cylinder mechanism. The fixed connection between the reinforcing plate 212 and the raised plate 221 enables the raised plate 221 to obtain lateral support from the reinforcing plate 212, which greatly improves the longitudinal stability and bending resistance of the raised plate 221.

[0035] Refer to the instruction manual appendix Figures 1 to 3 The servo electric cylinder mechanism is used to control the lifting and lowering movement of the riveting head 12. The servo electric cylinder mechanism includes a lifting component and a power component. The output end of the lifting component is connected to the riveting head 12 and is used to control the lifting and lowering movement of the riveting head 12. The output end of the power component is connected to the lifting component and is used to provide lifting and lowering power to the lifting component.

[0036] It should be noted that the core function of the servo electric cylinder mechanism is to provide precise and controllable linear motion and pressure output. The lifting component converts the rotational motion of the power component into linear motion and directly drives the riveting head 12 to perform precise lifting. The power component provides a controllable power source and drives the lifting component through the transmission mechanism.

[0037] It is worth noting that the key advantage of using a servo electric cylinder lies in its closed-loop control capability. The control system can accurately set the displacement and riveting force of the riveting head 12. This is the core technology to solve the problems of jamming due to excessive pressure or loosening due to excessive pressure in traditional manual or pneumatic riveting. Its accuracy is far higher than that of ordinary pneumatic or hydraulic cylinders.

[0038] Refer to the instruction manual appendix Figure 3 The lifting assembly includes an electric cylinder housing 311 mounted on the upper end of the mounting plate 222, a lifting cylinder 312 mounted inside the electric cylinder housing 311, and a threaded rod 313 mounted inside the electric cylinder housing 311. The threaded rod 313 is threadedly connected to the lifting cylinder 312, and the lifting cylinder 312 is slidably connected to the electric cylinder housing 311. The lower end of the lifting cylinder 312 is connected to the riveting head 12.

[0039] It should be noted that the electric cylinder housing 311 is the supporting and guiding housing of the entire lifting assembly. The threaded rod 313 is driven to rotate by the power assembly. The lifting cylinder 312 has an internal thread that matches the threaded rod 313. At the same time, its outer wall is linearly slidingly connected to the inner cavity of the electric cylinder housing 311, ensuring that the lifting cylinder 312 can only move linearly along the axial direction and cannot rotate. The rotation of the threaded rod 313 is converted into the linear lifting of the lifting cylinder 312 through the threaded pair.

[0040] Refer to the instruction manual appendix Figure 3 The power assembly includes a linkage box 321 mounted on the upper end of the electric cylinder housing 311, a top cover 322 mounted on the upper end of the linkage box 321, a motor 323 mounted on the lower end of the linkage box 321, and a belt 324 disposed inside the linkage box 321. The belt 324 is sleeved on the outside of the output end of the motor 323 and the input end of the threaded rod 313.

[0041] It should be noted that the linkage box 321 connects the motor 323 and the electric cylinder housing 311 and houses the belt 324 transmission mechanism. The top cover 322 is removable, which facilitates the installation, maintenance or replacement of the belt 324. The motor 323 provides rotational power, and its output shaft drives the threaded rod 313 to rotate through the belt 324 to achieve transmission.

[0042] Refer to the instruction manual appendix Figures 1 to 5 The positioning mechanism is used to limit the processing position of the workpiece. The positioning mechanism includes a plug-in component and a workpiece component. The limiting end of the plug-in component is connected to the workpiece component. The plug-in component is used to limit the processing position of the workpiece component. The workpiece component is used to be pressed together into a whole.

[0043] It should be noted that the core task of the positioning mechanism is to ensure that the workpieces to be assembled maintain a precise relative position before and during the riveting process. The insertion assembly provides physical positioning reference and constraints. Under the pressure of the riveting head 12, the workpiece assembly is riveted together into a whole component.

[0044] It is worth noting that the accuracy of the positioning mechanism directly determines the quality of the final assembly. The insertion component must reliably limit the workpiece assembly and facilitate the placement and removal of the workpiece to improve efficiency.

[0045] Refer to the instruction manual appendix Figure 5 The plug-in assembly includes a positioning seat 411 mounted on the upper end of the workbench 11, a positioning disk 412 mounted on the upper end of the positioning seat 411, and a positioning block 413 mounted on the upper end of the positioning disk 412.

[0046] It should be noted that the positioning seat 411 is fixedly installed on the worktable 11, providing a stable foundation. The positioning disk 412 is installed on the positioning seat 411, and its top surface is used to place and support the workpiece assembly. The positioning block 413 is fixed at the upper center of the positioning disk 412, and its shape is precisely matched with the inner hole of the eccentric kit 421 to ensure that the eccentric kit 421 is accurately positioned at the center position directly below the riveting head 12.

[0047] Refer to the instruction manual appendix Figure 5 The workpiece assembly includes an eccentric kit 421 disposed on the upper end of the positioning plate 412, a bearing 422 disposed on the outside of the eccentric kit 421, and an eccentric wheel 423 disposed on the outside of the bearing 422. The positioning block 413 is inserted into the interior of the eccentric kit 421.

[0048] It should be noted that during assembly, the eccentric kit 421 is first fitted onto the positioning block 413, with its inner hole matching the positioning block 413 for precise positioning. Then, the bearing 422 is fitted onto the outside of the eccentric kit 421, and finally, the eccentric wheel 423 is fitted onto the outside of the bearing 422. When the rivet head 12 presses down, its positioning cylinder 14 first inserts into the center hole at the top of the eccentric kit 421 for final guidance. Then, the chamfered surface 13 of the rivet head 12 contacts and presses against the upper end face of the eccentric wheel 423, pressing it downwards so that the bearing 422 is pressed into and fixed in the groove or space formed between the eccentric wheel 423 and the eccentric kit 421. At the same time, the upper end hole of the eccentric wheel 423 is riveted along the chamfered surface 13 of the rivet head 12, forming the final solid assembly.

[0049] Working principle: First, the eccentric assembly 421, bearing 422, and eccentric wheel 423 to be assembled are conveyed to the positioning mechanism via an external feeding device. At this time, the eccentric assembly 421 is placed on the upper end of the positioning plate 412, and its inner hole is precisely fitted onto the positioning block 413 to achieve radial positioning. Subsequently, the bearing 422 is fitted onto the outside of the eccentric assembly 421, and the eccentric wheel 423 is fitted onto the outside of the bearing 422. In this way, the workpiece assembly is in the position to be riveted. After the riveting program is started, the power component of the servo electric cylinder mechanism is driven to work, and the motor 323 rotates. The threaded rod 313 is rotated by the belt 324 inside the linkage box 321. Since the threaded rod 313 is threadedly connected to the lifting cylinder 312 and the lifting cylinder 312 is slidably connected to the electric cylinder housing 311, the rotational motion of the threaded rod 313 is converted into the precise linear downward motion of the lifting cylinder 312. The lifting cylinder 312 drives the rivet head 12 at its lower end to move downward. The rivet head 12 first inserts into the center hole at the top of the eccentric kit 421 through the positioning cylinder 14 at its lower end for final centering guidance. As the rivet head 12 continues to move downward, the outer side of its inverted... The chamfered surface 13 contacts and presses against the upper end face of the eccentric wheel 423. Under the precise and controllable downward pressure provided by the servo electric cylinder mechanism, the eccentric wheel 423 is pushed downward, pressing the bearing 422 into and tightly fixing it within the designed gap formed between the eccentric wheel 423 and the eccentric assembly 421. At the same time, the chamfered surface 13 of the riveting head 12 acts on the upper end hole edge of the eccentric wheel 423, causing it to rivet, thereby firmly combining the eccentric wheel 423, the bearing 422, and the eccentric assembly 421 into a single integral component. The servo control system ensures the downward pressure... The precision of force and displacement prevents the bearing 422 from jamming due to excessive pressing or loosening and falling off due to insufficient pressing. After the riveting is completed, the servo electric cylinder mechanism reverses, and the motor 323 drives the threaded rod 313 to reverse, which drives the lifting cylinder 312 and the riveting head 12 to rise and reset. Then, the assembled parts are removed from the positioning block 413 and the positioning plate 412 by external unloading equipment, completing one work cycle. The whole process realizes the automation, high precision and high efficiency of the eccentric wheel sleeve assembly, which significantly improves production efficiency and product quality and reduces labor intensity.

[0050] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An eccentric sleeve press-fitting machine characterized by comprising: The control box (1) is equipped with a workbench (11) on its upper end. A frame mechanism is provided on the workbench (11). A servo electric cylinder mechanism is provided on the frame mechanism. The upper end of the frame mechanism is connected to the servo electric cylinder mechanism. A riveting head (12) is provided on the servo electric cylinder mechanism. The output end of the servo electric cylinder mechanism is connected to the riveting head (12). A chamfered surface (13) is provided on the outer side of the riveting head (12). A positioning cylinder (14) is provided on the lower end of the riveting head (12). A positioning mechanism is provided on the workbench (11). A support foot (15) is installed in a rectangular shape at the lower end of the control box (1). Multiple inlet holes (16) of different sizes are provided on the surface of the control box (1). A protective door (17) is installed on the surface of the control box (1).

2. The eccentric wheel sleeve riveting assembly machine according to claim 1, characterized in that: The frame mechanism is used to mount the servo electric cylinder mechanism at a high position. The frame mechanism includes a stabilizing component and a raising component. The connecting end of the stabilizing component is connected to the raising component, and the stabilizing component is used to support the raising component. The mounting end of the raising component is connected to the servo electric cylinder mechanism, and the raising component is used to increase the height of the servo electric cylinder mechanism.

3. The eccentric wheel sleeve riveting assembly machine according to claim 2, characterized in that: The stabilizing components include two support base plates (211) mounted on the upper end of the workbench (11) and a reinforcing plate (212) mounted on the upper end of the support base plates (211).

4. The eccentric wheel sleeve riveting assembly machine according to claim 3, characterized in that: The raised assembly includes a raised plate (221) installed on the upper end of the supporting base plate (211) and a mounting plate (222) installed on the upper end of the raised plate (221), with a reinforcing plate (212) fixedly connected to the raised plate (221).

5. The eccentric wheel sleeve riveting assembly machine according to claim 4, characterized in that: The servo electric cylinder mechanism is used to control the lifting and lowering movement of the riveting head (12). The servo electric cylinder mechanism includes a lifting component and a power component. The output end of the lifting component is connected to the riveting head (12). The lifting component is used to control the lifting and lowering movement of the riveting head (12). The output end of the power component is connected to the lifting component. The power component is used to provide lifting and lowering power to the lifting component.

6. The eccentric sleeve press assembly machine of claim 5, wherein: The lifting assembly includes an electric cylinder housing (311) mounted on the upper end of the mounting plate (222), a lifting cylinder (312) mounted inside the electric cylinder housing (311), and a threaded rod (313) mounted inside the electric cylinder housing (311). The threaded rod (313) is threadedly connected to the lifting cylinder (312), the lifting cylinder (312) is slidably connected to the electric cylinder housing (311), and the lower end of the lifting cylinder (312) is connected to the riveting head (12).

7. The eccentric wheel sleeve riveting assembly machine according to claim 6, characterized in that: The power assembly includes a linkage box (321) mounted on the upper end of the electric cylinder housing (311), a top cover (322) mounted on the upper end of the linkage box (321), a motor (323) mounted on the lower end of the linkage box (321), and a belt (324) disposed inside the linkage box (321). The belt (324) is sleeved on the outside of the output end of the motor (323) and the input end of the threaded rod (313).

8. The eccentric sleeve press assembly machine of claim 7, wherein: The positioning mechanism is used to limit the processing position of the workpiece. The positioning mechanism includes a plug-in component and a workpiece component. The limiting end of the plug-in component is connected to the workpiece component. The plug-in component is used to limit the processing position of the workpiece component. The workpiece component is used to be pressed together into a whole.

9. The eccentric wheel sleeve riveting assembly machine according to claim 8, characterized in that: The plug-in assembly includes a positioning seat (411) mounted on the upper end of the worktable (11), a positioning plate (412) mounted on the upper end of the positioning seat (411), and a positioning block (413) mounted on the upper end of the positioning plate (412).

10. The eccentric sleeve press assembly machine of claim 9, wherein: The workpiece assembly includes an eccentric kit (421) disposed on the upper end of the positioning plate (412), a bearing (422) disposed on the outside of the eccentric kit (421), and an eccentric wheel (423) disposed on the outside of the bearing (422). The positioning block (413) is inserted into the interior of the eccentric kit (421).

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