A device for trimming plastic parts after molding

Abstract

The present invention discloses a post-molding trimming device for plastic accessories, which relates to the technical field of plastic accessories processing, and comprises a base, a fixed frame is fixedly connected to the top of the base, a driven gear table of the plastic accessories is arranged inside the fixed frame, a moving plate is arranged on one side of the fixed frame, and a trimming assembly for trimming the plastic accessories is arranged on the moving plate. The post-molding trimming device for plastic accessories, driven by a cylinder, drives a scraper to accurately align and fit the edge of the plastic accessory through the moving plate, and utilizes the synchronous rotation function of the servo motor, so that the scraper can efficiently and accurately cut off the residual edge ring of the plastic accessory, greatly reducing the error and time consumption of manual operation, improving the automation level of the production line and product quality, and realizing flexible adjustment of the scraper cutting angle by driving the rectangular frame and the scraper through the rotating motor, meeting the processing requirements of plastic accessories of different shapes and sizes, and enhancing the adaptability and flexibility of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of plastic parts processing, in particular to a device for trimming plastic parts after molding. Background Art

[0002] In the plastic processing industry, the molding and trimming of plastic parts are key links in the production process. Existing plastic parts trimming devices after molding mostly use mold injection molding or compression molding technology. Through the precise design and control of the mold, the molten plastic material is injected into the mold cavity, and the required plastic parts are formed after cooling and solidification. However, although these technologies meet the production needs to a certain extent, there are still some significant defects and shortcomings.

[0003] First, the existing trimming devices for plastic parts after molding often fail to ensure the flatness and precision of the edges of the parts during the molding process. Due to the influence of various factors such as mold design, injection pressure, and temperature control, the edges of the molded plastic parts often have burrs and residual rings, which not only affects the appearance quality of the product, but also may cause inconvenience to subsequent assembly and use.

[0004] Secondly, the automation level of existing technologies is relatively low, especially in the trimming process, which often relies on manual operation or simple mechanical devices to remove excess edges. This method is not only inefficient, but also easily introduces human errors, resulting in unstable product quality. At the same time, manual operation also poses safety hazards, increasing the risks in the production process. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a device for trimming plastic accessories after molding, which solves the technical problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for trimming plastic parts after molding, comprising a base, a fixing frame fixedly connected to the top of the base, a driven gear stage of the plastic parts arranged inside the fixing frame, a moving plate arranged on one side of the fixing frame, and a trimming assembly for trimming the plastic parts arranged on the moving plate;

[0007] The trimming assembly includes a control rod installed on a fixed frame for transverse sliding, a rectangular frame is provided at the inner end of the control rod, the inner end of the rectangular frame is rotatably connected to a fourth gear, the upper and lower ends of the fourth gear are meshingly connected to a second gear rod, a driving motor is provided on one side of the fourth gear, a connecting rod is hinged at the inner end of the second gear rod, a scraper is hinged at the other end of the connecting rod, a positioning rod is hinged at the outer end of the scraper, and the positioning rod is fixedly installed on the rectangular frame.

[0008] As a further preferred embodiment of the present technical solution, a rotating motor is fixedly mounted on the inner end of the control rod, the output end of the rotating motor is fixedly connected to the rectangular frame, a guide rod is fixedly connected to the outer end of the control rod, the guide rod is slidably mounted on the movable plate, and a third damping spring is provided between the control rod and the movable plate and is sleeved on the guide rod.

[0009] As a further preferred embodiment of the present technical solution, a cross bar slidably mounted on a fixed frame is fixedly mounted on the inner end of the movable plate, a guide wheel is provided on the inner end of the cross bar, a first gear rod is fixedly connected on both sides of the movable plate, a gear plate is slidably connected on the fixed frame, a second gear is meshedly connected on one side of the gear plate, the second gear is rotatably mounted on the fixed frame via a rotating shaft, and a third gear meshedly connected to the first gear rod is fixedly connected at both ends of the rotating shaft.

[0010] As a further preferred embodiment of the present technical solution, the inner end of the tooth plate is fixedly connected to a fixed rod, the inner end of the fixed rod is a sliding movable rod, the bottom of the movable rod is rotatably connected to a pressure plate, and a second damping spring is arranged between the pressure plate and the fixed rod and is sleeved on the movable rod.

[0011] As a further preferred embodiment of the present technical solution, a cylinder is fixedly mounted on the fixed frame, and an output end of the cylinder is fixedly connected to the movable plate.

[0012] As a further preferred embodiment of the present technical solution, a servo motor is fixedly mounted on the top of the fixed frame, a driving rod is fixedly connected to the output end of the servo motor, and a first gear meshing with the driven gear stage is fixedly connected to the driving rod.

[0013] As a further preferred embodiment of the present technical solution, a vertical groove is provided on the fixing frame, and the tooth plate is slidably installed in the vertical groove, a support plate is fixedly connected to the inner wall of the fixing frame, and the driven gear stage is fixedly installed on the support plate.

[0014] As a further optimization of the present technical solution, a placing table is fixedly installed on the driven gear table, a number of sliding rods are slidably connected to the placing table, a buffer block is fixedly connected to the top of the sliding rod, a first damping spring sleeved on the sliding rod is arranged between the buffer block and the placing table, the bottom of the sliding rod passes through the placing table and is fixedly connected to a ring, and the position of the guide wheel corresponds to the position where the sliding rod drives the ring to move downward.

[0015] Compared with the prior art, it has the following beneficial effects:

[0016] Driven by the cylinder, the moving plate drives the scraper to accurately align and fit the edge of the plastic accessory. Utilizing the synchronous rotation function of the servo motor, the scraper can efficiently and accurately cut off the residual ring of the plastic accessory, greatly reducing the error and time consumption of manual operation, and improving the automation level and product quality of the production line; by driving the rotation of the rectangular frame and the scraper through the rotating motor, combined with the precise meshing transmission of the fourth gear and the second gear rod, the scraper cutting angle can be flexibly adjusted to meet the processing requirements of plastic accessories of different shapes and sizes, and enhance the adaptability and flexibility of the equipment; through the third damping spring and the second damping spring, they provide necessary buffering effects during the movement of the scraper and the descent of the pressure plate, respectively, effectively reducing the impact and wear between mechanical parts, extending the service life of the equipment, and also protecting the plastic accessories from unnecessary damage.

[0017] Driven by the servo motor, the synchronous rotation of the accessories and the driven gear table is achieved, laying a solid foundation for the subsequent trimming operation. At the same time, the cylinder-driven pressure plate system can intelligently sense and adapt to the position of the plastic accessories. Through gear transmission and the pressure plate pressing mechanism, it ensures that the plastic accessories are always in a stable and precise positioning state during the trimming process, effectively avoiding processing errors caused by offset or shaking; the close cooperation between the servo motor and the first gear ensures the synchronous rotation of the driven gear table and the plastic accessories. This design not only simplifies the transmission structure, but also improves the transmission efficiency. The trimming assembly makes full use of this synchronous rotation characteristic to perform efficient and precise trimming of plastic accessories, making the edges smoother and neater. The device is clean and meets the requirements of high-quality production. The introduction of the buffer block provides stable support and protection for the plastic accessories during movement, effectively preventing the accessories from being damaged by impact or vibration. At the same time, the damping mechanism integrated in the pressure plate system, such as the second damping spring, plays a good buffering role during the downward pressing process of the pressure plate, further protecting the plastic accessories and the equipment itself, and extending the service life of the equipment. As the plastic accessories move downward, the coordinated work of the slide bar, the ring and the guide wheel ensures the smooth progress of the trimming process. The close fit and sliding of the guide wheel and the outer wall of the ring not only improves the positioning accuracy of the plastic accessories, but also ensures the continuity and stability of the trimming operation, making the entire trimming process smoother and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the fixing frame in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the driven gear stage in the present invention;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 It is a schematic diagram of the structure of the guide wheel and the ring in the present invention;

[0023] Figure 6 It is a structural schematic diagram of the fixed frame and the movable plate, the first gear rod, the gear plate, the second gear, the third gear, and the pressure plate in the present invention;

[0024] Figure 7 It is a structural schematic diagram of the trimming assembly in the present invention;

[0025] Figure 8 It is a schematic diagram of the structure of the tooth plate, the fixing rod and the pressing plate in the present invention.

[0026] In the figure: 1, base; 2, fixed frame; 3, driven gear table; 4, moving plate; 5, trimming assembly; 21, servo motor; 22, driving rod; 23, first gear; 24, vertical groove; 25, support plate; 31, placement table; 32, slide rod; 33, buffer block; 34, first damping spring; 35, circular ring; 41, cross bar; 42, guide wheel; 43, first gear rod; 44, gear plate; 45, second gear; 46, third gear; 47, fixed rod; 48, moving rod; 49, pressure plate; 410, second damping spring; 411, cylinder; 51, control rod; 52, rectangular frame; 53, fourth gear; 54, second gear rod; 55, driving motor; 56, connecting rod; 57, scraper; 58, positioning rod; 59, rotating motor; 510, guide rod; 511, third damping spring. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] Embodiment 1: Combination Figure 1-Figure 8 As shown, the present invention provides a technical solution: a device for trimming plastic parts after molding. The mechanical device of the present design is mainly composed of a base 1. A fixing frame 2 is firmly connected to the top of the base 1. A driven gear stage 3 for plastic parts is installed on the inner side of the fixing frame 2 to facilitate the smooth operation of the plastic parts. In addition, a moving plate 4 is designed on one side of the fixing frame 2. A trimming component 5 for trimming the plastic parts is provided on the moving plate 4, which greatly improves the processing accuracy of the plastic parts.

[0029] The trimming assembly 5 includes a control rod 51 which is laterally slidably mounted on the fixed frame 2, and a rectangular frame 52 is provided at the inner end thereof. The inner end of the rectangular frame 52 is connected to a fourth gear 53 by rotation. The upper and lower ends of the fourth gear 53 are respectively meshed with the second gear rod 54. A driving motor 55 is also provided on one side thereof for driving the movement of the entire trimming assembly 5. A connecting rod 56 is hingedly connected to the inner end of the second gear rod 54, and a scraper 57 is hingedly connected to the other end of the connecting rod 56. A positioning rod 58 is hingedly connected to the outer end of the scraper 57, and the positioning rod 58 is fixedly mounted on the rectangular frame 52 to ensure the accurate positioning of the scraper 57.

[0030] A rotating motor 59 is fixedly mounted on the inner end of the control rod 51, and the output end of the rotating motor 59 is fixedly connected to the rectangular frame 52 to drive the rectangular frame 52 to rotate. A guide rod 510 is fixedly connected to the outer end of the control rod 51, and the guide rod 510 is slidably mounted on the moving plate 4. A third damping spring 511 sleeved on the guide rod 510 is arranged between the control rod 51 and the moving plate 4 to achieve smooth movement and positioning.

[0031] A cross bar 41 slidably mounted on the fixed frame 2 is fixedly mounted on the inner end of the moving plate 4, and a guide wheel 42 is provided on the inner end of the cross bar 41 for guiding the sliding of the moving plate 4 on the fixed frame 2. First gear rods 43 are fixedly connected to both sides of the moving plate 4, and a gear plate 44 is slidably connected to the fixed frame 2. A second gear 45 is meshedly connected to one side of the gear plate 44. The second gear 45 is rotatably mounted on the fixed frame 2 via a rotating shaft, and third gears 46 meshedly connected to the first gear rod 43 are fixedly connected to both ends of the rotating shaft, forming a complex gear transmission system to achieve precise motion control.

[0032] The inner end of the tooth plate 44 is fixedly connected with a fixed rod 47, the inner end of the fixed rod 47 slides with a moving rod 48, the bottom of the moving rod 48 is rotatably connected with a pressing plate 49, and a second damping spring 410 sleeved on the moving rod 48 is provided between the pressing plate 49 and the fixed rod 47 to achieve flexible control of the pressing plate 49, so as to better adapt to different working environments;

[0033] A cylinder 411 is fixedly mounted on the fixed frame 2, and an output end of the cylinder 411 is fixedly connected to the moving plate 4 for providing power to the moving plate 4 to achieve precise positioning thereof during operation.

[0034] In the embodiment of the present invention, when the actuator cylinder 411 drives the movable plate 4 to move inward, the elastic force provided by the third damping spring 511 can be used to synchronously push the control rod 51, the rectangular frame 52 and the scraper 57 inward. This process enables the scraper 57 to accurately correspond to the plastic accessory provided on the buffer block 33. Subsequently, driven by the servo motor 21, the driven gear stage 3 and the plastic accessory rotate synchronously, and the scraper 57 can perform the operation of cutting off the residual edge of the plastic accessory.

[0035] In response to the need to adjust the cutting angle of the scraper 57, the operator can start the rotating motor 59 to drive the rectangular frame 52 to rotate synchronously. Through the cooperation of the positioning rod 58 of the rectangular frame 52, the scraper 57 can perform a rotation operation, thereby achieving precise adjustment of the cutting angle of the scraper 57. In addition, by activating the driving motor 55, the fourth gear 53 can be rotated in the forward or reverse direction. The fourth gear 53 will then drive the second gear rod 54 meshing up and down to move on the rectangular frame 52. Such an operation can make the second gear rod 54 cooperate with the linkage rod 56 to further achieve the adjustment of the cutting angle of the scraper 57.

[0036] After the plastic accessories are installed, the operator can drive the movable plate 4 to move toward the side of the fixed frame 2 by starting the cylinder 411. The movement of the movable plate 4 will cause the cross bar 41 to slide on the fixed frame 2. The sliding of the cross bar 41 further drives the guide wheel 42, so that the guide wheel 42 can slide in contact with the outer wall of the bottom ring 35. While performing this series of movements, the movable plate 4 can also drive the first gear rod 43 to move synchronously. The movement of the first gear rod 43 will cause it to drive the meshing third gear 46 and the second gear 45 to rotate synchronously, so that the second gear 45 can drive the meshing tooth plate 44 to move downward during the rotation process. The downward movement of the tooth plate 44 will cause the fixed rod 47, the movable rod 48, the pressure plate 49 and the second damping spring 410 to move downward synchronously, wherein the second damping spring 410 plays a buffering role. This process enables the pressure plate 49 to position and fix the plastic accessories set on the buffer block 33.

[0037] Embodiment 2: Combination Figure 2 , Figure 3 , Figure 5 As shown, on the basis of the first embodiment, a servo motor 21 is fixedly installed on the top of the fixing frame 2. After being precisely positioned, the output end of the servo motor 21 forms a stable and firm fixed connection with the driving rod 22. The design of the driving rod 22 is very delicate, and a first gear 23 is cleverly fixedly connected to the upper end thereof. The first gear 23 forms a tight meshing connection with the driven gear stage 3, effectively transmitting power and motion.

[0038] The structure of the fixed frame 2 is also carefully designed, and a vertical groove 24 is cleverly opened on it. The tooth plate 44 is smoothly slid and installed in the vertical groove 24, providing additional stability and flexibility for the entire mechanism. A support plate 25 is fixedly connected to the inner wall of the fixed frame 2. This support plate 25 provides a solid installation plane for the driven gear stage 3. The driven gear stage 3 is fixedly installed on the support plate 25 through a precise installation process.

[0039] In an embodiment of the present invention, first, the plastic accessory is accurately installed on the driven gear platform 3. This step requires delicate operation to ensure that the accessory can be correctly fixed on the driven gear platform 3. Subsequently, the servo motor 21 is started, and it transmits power through the drive rod 22. The drive rod 22 starts to rotate synchronously. This synchronous rotation is further transmitted through the first gear 23, and the first gear 23 also starts to rotate synchronously. At the same time, the driven gear platform 3 is meshed with the first gear 23, so the driven gear platform 3 also starts to rotate synchronously. In this process, the rotation of the driven gear platform 3 not only drives itself, but also drives the plastic accessories installed thereon, so that the plastic accessories also start to rotate synchronously. Finally, the trimming component 5 uses this synchronous rotation to trim the plastic accessories to ensure that the edges of the plastic accessories are smooth and tidy.

[0040] Example 3: Combination Figure 3 , Figure 4 , Figure 5 As shown, on the basis of the second embodiment, a placing platform 31 is firmly installed on the driven gear platform 3, and a plurality of slide bars 32 can be slidably connected to the placing platform 31. These slide bars 32 are fixedly connected with buffer blocks 33 at their top positions. These buffer blocks 33 are structurally located between the placing platform 31 and the slide bars 32, and are provided with a first damping spring 34 to be sleeved on the slide bars 32, so as to play a role of buffering and shock absorption. At the bottom of the slide bars 32, they pass through the placing platform 31 and are fixedly connected with a ring 35. In addition, the slide bar 32 can drive the ring 35 to move downward, and the position of the guide wheel 42 is precisely aligned and corresponds to the position where the slide bar 32 drives the ring 35 to move downward.

[0041] In the embodiment of the present invention, during the operation of the trimming machine, the plastic part to be trimmed needs to be accurately placed on the top of the buffer block 33. The buffer block 33 is a key component of the trimming machine. Its function is to provide a stable support during the movement of the plastic part to prevent the part from being damaged during the movement.

[0042] After the plastic parts are placed, the next step is to drive the pressing plate 49 to move downward through a series of mechanical structures, which involves the operation of the cylinder 411 to push the moving plate 4. The moving plate 4 is an important connecting component, which transmits the force of the cylinder 411 to the first gear rod 43;

[0043] The first gear rod 43 meshes with the third gear 46 and the second gear 45 to form a gear transmission system. When the first gear rod 43 rotates, it drives the third gear 46 and the second gear 45 to rotate through meshing, and the second gear 45 drives the gear plate 44 to move downward. The gear plate 44 is connected to the pressure plate 49 through the fixed rod 47 and the moving rod 48. When the gear plate 44 moves downward, the gear plate 44 rotates accordingly, and the pressure plate 49 is driven to move downward through the guidance of the fixed rod 47 and the moving rod 48;

[0044] In this process, the downward movement of the pressing plate 49 is not only achieved by mechanical force, but also by the movement of the plastic parts. Due to the movement of the pressing plate 49, the plastic parts on the buffer block 33 are also subjected to downward movement force, which can ensure that the plastic parts maintain stable movement during the entire trimming process.

[0045] When the buffer block 33 moves downward with the plastic accessory, it will drive the slide bar 32 and the ring 35 to move together. When the ring 35 moves to the bottom, it will be at the same horizontal position as the guide wheel 42. At this time, the further inward movement of the cross bar 41 will make the guide wheel 42 fit and slide against the outer wall of the ring 35 at the bottom. This process ensures the precise positioning of the plastic accessory in the trimming machine and also ensures the smooth progress of the trimming process.

[0046] Working principle of a trimming device for plastic parts after molding:

[0047] Step 1, after placing the plastic accessory to be trimmed on the buffer block 33, the cylinder 411 is turned on to drive the movable plate 4 to move toward one side of the fixed frame 2, and the movable plate 4 drives the cross bar 41 to slide on the fixed frame 2, so that the cross bar 41 drives the guide wheel 42, so that the guide wheel 42 slides in contact with the outer wall of the circular ring 35 at the bottom, and the movable plate 4 moves toward one side of the fixed frame 2, and can drive the first gear rod 43 to move synchronously, so that the first gear rod 43 drives the meshing third gear 46 and the second gear 45 to rotate synchronously, so that when the second gear 45 rotates, it drives the meshing toothed plate 44 to move downward, so that when the toothed plate 44 moves downward, it drives the fixed rod 47, the movable rod 48, the pressure plate 49, and the second damping spring 410 to move downward synchronously, so that the pressure plate 49 positions and fixes the plastic accessory located on the buffer block 33;

[0048] Step 2: The circular ring 35 moved to the bottom is at the same horizontal position as the guide wheel 42, that is, when the cross bar 41 moves inward, it can drive the guide wheel 42 to slide against the outer wall of the circular ring 35 at the bottom;

[0049] Step three, when the movable plate 4 is driven to move inward by the cylinder 411, the control rod 51, the rectangular frame 52 and the scraper 57 are pushed inward under the elastic force of the third damping spring 511, so that the scraper 57 corresponds to the plastic accessory on the buffer block 33, and the driven gear table 3 and the plastic accessory rotate synchronously under the drive of the servo motor 21, so that the scraper 57 can cut off the remaining edge of the plastic accessory.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for trimming plastic parts after molding, comprising a base (1), characterized in that: A fixing frame (2) is fixedly connected to the top of the base (1), a driven gear stage (3) of the plastic accessory is arranged inside the fixing frame (2), a moving plate (4) is arranged on one side of the fixing frame (2), and a trimming assembly (5) for trimming the plastic accessory is arranged on the moving plate (4); The trimming assembly (5) comprises a control rod (51) which is laterally slidably mounted on a fixed frame (2); a rectangular frame (52) is arranged at the inner end of the control rod (51); a fourth gear (53) is rotatably connected to the inner end of the rectangular frame (52); the upper and lower ends of the fourth gear (53) are meshingly connected to a second gear rod (54); a driving motor (55) is arranged on one side of the fourth gear (53); a connecting rod (56) is hingedly connected to the inner end of the second gear rod (54); a scraper (57) is hingedly connected to the other end of the connecting rod (56); a positioning rod (58) is hingedly connected to the outer end of the scraper (57); and the positioning rod (58) is fixedly mounted on the rectangular frame (52); A rotating motor (59) is fixedly mounted on the inner end of the control rod (51); the output end of the rotating motor (59) is fixedly connected to the rectangular frame (52); a guide rod (510) is fixedly connected to the outer end of the control rod (51); the guide rod (510) is slidably mounted on the moving plate (4); and a third damping spring (511) sleeved on the guide rod (510) is provided between the control rod (51) and the moving plate (4); A cross bar (41) slidably mounted on the fixed frame (2) is fixedly mounted on the inner end of the movable plate (4), a guide wheel (42) is provided on the inner end of the cross bar (41), first gear rods (43) are fixedly connected to both sides of the movable plate (4), a gear plate (44) is slidably connected to the fixed frame (2), one side of the gear plate (44) is meshingly connected to a second gear (45), the second gear (45) is rotatably mounted on the fixed frame (2) via a rotating shaft, and third gears (46) meshingly connected to the first gear rod (43) are fixedly connected to both ends of the rotating shaft; The inner end of the tooth plate (44) is fixedly connected to a fixed rod (47), the inner end of the fixed rod (47) is slidably connected to a movable rod (48), the bottom of the movable rod (48) is rotatably connected to a pressing plate (49), and a second damping spring (410) sleeved on the movable rod (48) is provided between the pressing plate (49) and the fixed rod (47); A cylinder (411) is fixedly mounted on the fixed frame (2), and an output end of the cylinder (411) is fixedly connected to the movable plate (4).

2. A post-molding trimming device for plastic parts according to claim 1, characterized in that: A servo motor (21) is fixedly mounted on the top of the fixed frame (2); a driving rod (22) is fixedly connected to the output end of the servo motor (21); and a first gear (23) meshingly connected to the driven gear platform (3) is fixedly connected to the driving rod (22).

3. A post-molding trimming device for plastic parts according to claim 1, characterized in that: A vertical groove (24) is formed on the fixed frame (2), and the tooth plate (44) is slidably mounted in the vertical groove (24). A support plate (25) is fixedly connected to the inner wall of the fixed frame (2), and the driven gear platform (3) is fixedly mounted on the support plate (25).

4. The device for trimming plastic parts after molding according to claim 1, characterized in that: A placement platform (31) is fixedly mounted on the driven gear platform (3), a plurality of slide bars (32) are slidably connected to the placement platform (31), a buffer block (33) is fixedly connected to the top of the slide bar (32), a first damping spring (34) sleeved on the slide bar (32) is arranged between the buffer block (33) and the placement platform (31), the bottom of the slide bar (32) passes through the placement platform (31) and is fixedly connected to a circular ring (35), and the position of the guide wheel (42) corresponds to the position of the circular ring (35) driven by the slide bar (32) to move downward.

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