A performance testing device for plastic pipe processing

Abstract

The present invention discloses a performance testing device for plastic pipe processing, which relates to the field of plastic pipe processing, and comprises a base and an operating table fixedly installed on the upper end of the base, a support frame and a support member fixedly installed on the upper end of the operating table, and the support member is located on the left side of the support frame, a drive motor fixedly installed on the left side of the operating table, and the drive motor fixedly installed on the left side of the operating table, two groups of moving plates are threadedly installed on the outer side of the threaded rod, and a moving cylinder is slidably installed on the upper end of the moving plate. The performance testing device for plastic pipe processing, by slidingly installing a limiting slider inside a limiting member and a clamping member, can make the limiting slider automatically separate from the plastic pipe while supporting the plastic pipe, thereby ensuring the stability of the unloading work of the device, and through the limiting member and the clamping member, the movement of the limiting member and the clamping member can complete the automatic loading and unloading process of the plastic pipe, thereby improving the convenience of using the device.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe processing, in particular to a performance detection device for plastic pipe processing. Background Art

[0002] Plastic pipes are generally made of synthetic resin, that is, polyester as raw material, with stabilizers, lubricants, plasticizers, etc. added, and are extruded in a pipe making machine by the "plastic" method. Plastic pipes can be made into pipes of different sizes according to different usage requirements. Before using plastic pipes, their performance needs to be tested to determine whether the plastic pipes meet the usage requirements. Performance testing equipment will be used in the process of performance testing of plastic pipes, but the existing performance testing equipment still has certain usage defects during use, such as:

[0003] Patent application publication number CN217717571U discloses a plastic pipe thermal performance testing device, wherein a lifting assembly is provided to drive a lifting plate to drive two fixed cylinders at the bottom of a mounting frame to move up and down to cooperate with a supporting cylinder to clamp the plastic pipe, thereby improving the stability of the plastic pipe during the testing process; the spacing between the two supporting cylinders and the two fixed cylinders can be adjusted, so that plastic pipes of different sizes can be better clamped; the reinforcement plate and reinforcement rod are provided to make the device as a whole more stable during use;

[0004] In the above-mentioned document, before the detection device detects the plastic tube, it is necessary to move the fixing plate downward so that the fixing tube cooperates with the supporting tube to limit and clamp the plastic tube. In this process, the plastic tube needs to be placed on the upper end of the two sets of supporting tubes, and this process needs to be completed manually. After the performance test of the plastic tube is completed, it also needs to be removed manually. In addition, there are too many human factors in the process of placing and removing the plastic tube, and the accuracy of the placement of the plastic tube cannot be determined. At the same time, the speed of taking and placing is also affected by human factors, which easily leads to inconvenience in the process of loading and unloading the device.

[0005] For example, the patent application announcement number CN220932845U discloses a plastic pipe thermal performance detection device. When in use, the limiter includes a limit ring, a fixed block, a limit frame, a transmission gear, a threaded column, a limiter block, a rotating ring and a wrench. The structure is simple. When in use, you only need to place the plastic pipe inside the limit ring and then turn the wrench. No complicated operation is required. The limiter can center the plastic pipe inside the limit ring, and the rotating ring drives the transmission gear to rotate. When the transmission gear rotates, the first threaded hole inside drives the threaded column to rotate, and the threaded column drives the limiter block to move, so that the limiter block clamps the plastic pipe, so that the plastic pipe is better clamped and fixed, thereby improving the accuracy of the detection. The limiter can be adjusted to make it suitable for plastic pipes of different specifications. Since the rotating ring is meshed with multiple transmission gears, the rotation speed of the transmission gear can be changed by adjusting the position of the rotating ring, thereby meeting the detection needs of plastic pipes of different specifications.

[0006] In the above document, during the use of the device, the plastic tube will be clamped by the limit block, so that the plastic tube can be centered inside the limit ring for detection. In the process of centering the plastic tube, it is necessary to manually hold the plastic tube and perform limit adjustment on the plastic tube. In the process of limit adjustment of the plastic tube, the holding condition of the plastic tube determines whether the device is convenient for the plastic tube limiting process, and the process of limiting and removing the plastic tube needs to be done manually, resulting in a large impact of human factors during the use of the device, which is easy to bring many inconveniences to the normal use of the device.

[0007] In view of the above problems, it is urgent to carry out innovative design based on the original equipment structure. Summary of the invention

[0008] The purpose of the present invention is to provide a performance testing device for plastic pipe processing to solve the problem proposed in the above background technology that the plastic pipe also needs to be manually removed after the performance test is completed, and there are too many human factors influencing the placement and removal of the plastic pipe, and the accuracy of the placement of the plastic pipe cannot be determined. At the same time, the speed of placement is also affected by human factors, which can easily lead to inconvenience in the process of loading and unloading the device, and the holding condition of the plastic pipe determines whether the device is convenient for the plastic pipe limiting process, and the process of limiting and removing the plastic pipe needs to be completed manually, resulting in a large impact of human factors during the use of the device, which can easily bring many inconveniences to the normal use of the device.

[0009] To achieve the above object, the present invention provides the following technical solution: a performance testing device for plastic pipe processing, comprising a base and an operating table fixedly installed on the upper end of the base;

[0010] A support frame and a support member are fixedly installed on the upper end of the operating table, and the support member is located on the left side of the support frame.

[0011] Preferably, a feeding structure is provided inside the operating table, and the feeding structure can achieve the effect of automatic loading and unloading of the equipment;

[0012] A driving motor is arranged inside the feeding structure, and the driving motor is fixedly installed on the left side of the operating table, and a threaded rod is fixedly installed on the output end of the driving motor, and the threaded rod is rotatably connected to the operating table.

[0013] Preferably, two sets of moving plates are installed on the outer thread of the threaded rod, and a moving cylinder is slidably installed on the upper end of the moving plate, and a limiting member and a clamping member are fixedly installed on the upper end of the moving cylinder, and the clamping member is located on the right side of the limiting member. A moving groove is opened at the upper end of the operating table, and the clamping member and the limiting member are slidably connected to the operating table through the moving groove.

[0014] Preferably, a limiting slider is slidably installed inside the upper ends of the clamping member and the limiting member, and a limiting spring is fixedly installed on one end of the limiting slider close to the clamping member and the limiting member, and the limiting spring is fixedly connected to the clamping member and the limiting member.

[0015] Preferably, a pushing structure is provided at the upper end of the operating table, and the pushing structure can achieve the effect of stable material unloading of the equipment;

[0016] A pushing block and an auxiliary airbag are arranged inside the pushing structure. The pushing block is slidably mounted on the upper end of the clamping member, and the auxiliary airbag is bonded to one end of the pushing block close to the clamping member, and the auxiliary airbag is located inside the clamping member.

[0017] Preferably, a fixing cylinder is fixedly installed on the side of the right moving plate away from the supporting frame, and a supporting spring is sleeved on the outer side of the fixing cylinder, and an extrusion piece is slidably installed inside the fixing cylinder, and a main airbag is bonded to the side of the extrusion piece close to the fixing cylinder, the interior of the main airbag is connected with the interior of the auxiliary airbag, and the volume of the main airbag is larger than that of the auxiliary airbag, and a discharge plate is fixedly installed on the upper right end of the operating table.

[0018] Preferably, an extrusion groove is opened inside the right side of the operating table, and the center line of the extrusion groove and the fixed cylinder are in the same straight line, and two groups of extrusion grooves and fixed cylinders are correspondingly arranged.

[0019] Preferably, a limiting structure is provided inside the support frame, and the limiting structure can achieve an effect of efficient clamping of the device;

[0020] A driving motor is arranged inside the limiting structure, and an output shaft is fixedly installed on the output end of the driving motor, and the output shaft is rotatably connected to the support frame, and two sets of driving gears are fixedly installed on the outer side of the output shaft.

[0021] Preferably, a rotating gear ring is provided inside the limiting structure, and the rotating gear ring is rotatably installed inside the support frame, and the outer side of the rotating gear ring is meshed and connected with the driving gear, a rotating shaft is rotatably installed inside the driving gear, and a driven gear and a connecting gear are fixedly installed on the outer side of the rotating shaft, and the driven gear is meshed and connected with the inside of the rotating gear ring, a moving gear plate is slidably installed inside the support frame, and the moving gear plate is meshed and connected with the connecting gear, and a fixed block is fixedly installed on one end of the moving gear plate away from the rotating gear ring, and a limiting roller is fixedly installed on the side of the fixed block away from the rotating gear ring, and four groups of limiting rollers, moving gear plates and rotating shafts are arranged at equal angles about the midpoint of the rotating gear ring.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By arranging the limiter and the clamping member at the upper end of the two sets of moving plates, the movement of the limiter and the clamping member can complete the automatic loading and unloading process of the plastic pipe, thereby improving the convenience of using the equipment;

[0024] 2. By slidingly installing a limit slider inside the limit piece and the clamping piece, the limit slider can support the plastic pipe and automatically separate from the plastic pipe;

[0025] 3. By controlling the gas exchange between the main airbag and the auxiliary airbag, the push block can be moved and squeezed at both ends of the plastic tube, ensuring the stability of the separation of the plastic tube and the limit slider, avoiding the tilting and falling of the plastic tube, and ensuring the stability of the unloading work of the equipment;

[0026] 4. The driving motor drives the rotating gear ring to rotate, so that the four sets of limiting rollers can move synchronously, and the four sets of limiting rollers can approach or separate the plastic pipe at the same time, effectively improving the efficiency of the equipment in limiting and clamping the plastic pipe;

[0027] 5. Through the inclined setting of the upper end surface of the discharging plate, the plastic pipe on the upper end of the discharging plate can automatically roll down from the upper end of the discharging plate and the operating table, ensuring the convenience of unloading of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of the limiting member of the present invention;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the sports board of the present invention;

[0031] Figure 4It is a schematic diagram of the three-dimensional structure of the limit spring of the present invention;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the clamping member of the present invention;

[0033] Figure 6 This is a schematic diagram of the three-dimensional structure of the push block of the present invention;

[0034] Figure 7 It is a schematic diagram of a cutaway three-dimensional structure of an extruded part of the present invention;

[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the rotating gear ring of the present invention;

[0036] Fig. 9 It is a schematic diagram of the three-dimensional structure of the connecting gears of the present invention.

[0037] In the figure: 1. base; 2. operating table; 3. support frame; 4. support member; 5. drive motor; 6. threaded rod; 7. moving plate; 8. moving cylinder; 9. limit member; 10. clamping member; 11. limit slider; 12. limit spring; 13. push block; 14. auxiliary airbag; 15. fixed cylinder; 16. support spring; 17. extrusion member; 18. main airbag; 19. extrusion groove; 20. moving groove; 21. drive motor; 22. output shaft; 23. drive gear; 24. rotating ring gear; 25. rotating shaft; 26. driven gear; 27. connecting gear; 28. moving gear plate; 29. ​​fixed block; 30. limit roller; 31. discharge plate. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0039] Embodiment 1: This embodiment Figure 1-Figure 5 As shown, in order to solve the problem that the existing equipment cannot automatically load and unload materials, the process of feeding and unloading materials inside the equipment is disclosed, and the effect that the equipment can automatically load and unload materials is achieved. The specific contents are as follows:

[0040] A base 1 and an operating table 2 fixedly mounted on the upper end of the base 1;

[0041] A support frame 3 and a support member 4 are fixedly mounted on the upper end of the operating table 2, and the support member 4 is located on the left side of the support frame 3;

[0042] A driving motor 5 is fixedly installed on the left side of the operating table 2, and a threaded rod 6 is fixedly installed on the output end of the driving motor 5, and the threaded rod 6 is rotatably connected to the operating table 2;

[0043] Two sets of moving plates 7 are threadedly installed on the outer side of the threaded rod 6, and a moving cylinder 8 is slidably installed on the upper end of the moving plate 7, and a limiter 9 and a clamping member 10 are fixedly installed on the upper end of the moving cylinder 8, and the clamping member 10 is located on the right side of the limiter 9. A moving groove 20 is opened on the upper end of the operating table 2, and the clamping member 10 and the limiter 9 are slidably connected with the operating table 2 through the moving groove 20;

[0044] A limiting slider 11 is slidably installed inside the upper ends of the clamping member 10 and the limiting member 9, and a limiting spring 12 is fixedly installed on one end of the limiting slider 11 close to the clamping member 10 and the limiting member 9, and the limiting spring 12 is fixedly connected to the clamping member 10 and the limiting member 9.

[0045] When using the performance testing equipment for plastic pipe processing, first place the equipment at the position where it needs to work, and then the equipment can be used to perform performance testing on the plastic pipe. At this time, the plastic pipe to be tested needs to be placed on the upper end of the support 4. After the plastic pipe is placed, the drive motor 5 can be operated and drive the threaded rod 6 to rotate. During the rotation of the threaded rod 6, the two sets of moving plates 7 will slide inside the operating table 2, and during the movement of the left moving plate 7, the moving cylinder 8 will drive the limit member 9 to move, and the limit member 9 will slide inside the moving groove 20 at this time, and during the tilting movement of the limit member 9 inside the moving groove 20, the limit slider 11 inside the limit member 9 will tilt and move to the inside of the plastic pipe. At this time, the plastic pipe can be supported by the two sets of limit sliders 11 and the plastic pipe can be separated from the support 4. After the plastic tube is separated from the support frame 3, the limiting member 9 will drive the plastic tube to continue to move into the support frame 3 through the limiting slider 11, and then the plastic tube can be moved into the support frame 3. At this time, the plastic tube can be limited in the support frame 3 by the limiting roller 30, and then the limiting member 9 will drive the limiting slider 11 to move in the opposite direction. At this time, the limiting slider 11 will be squeezed by the plastic tube and move into the limiting member 9, and then the limiting slider 11 can be separated from the plastic tube. At this time, the performance of the plastic tube can be tested. The performance testing structure is mostly an electronic component structure, and the electronic component structure is arranged in the support frame 3. For example, components such as pressure sensors are needed to detect the compressive effect, and temperature sensors are needed to detect the high temperature resistance of the plastic tube. The specific testing structure can be set according to the specific usage scenario. At this point, the automatic feeding process of the equipment for the plastic tube is completed, which effectively improves the convenience of using the equipment.

[0046] After the performance test of the plastic tube is completed, the plastic tube needs to be removed from the inside of the support frame 3. At this time, the driving motor 5 needs to continue to drive the threaded rod 6 to rotate and drive the moving plate 7 on the right to move toward the support frame 3. At this time, the clamping member 10 and the limit slider 11 will move with the moving plate 7, and the limit slider 11 will contact with the two ends of the plastic tube during the movement and be squeezed by the two ends of the plastic tube. At this time, the limit slider 11 will move toward the inside of the clamping member 10 and squeeze the limit spring 12. When the limit member 9 and the upper limit slider 11 are separated from the plastic tube, the limit slider 11 will also squeeze the limit spring 12. The plastic tube is squeezed, and after the limit slider 11 at the upper end of the clamping member 10 completes the movement, the limit slider 11 at the upper end of the clamping member 10 will support the plastic tube, and the limit roller 30 can be separated from the plastic tube. Then the drive motor 5 can drive the threaded rod 6 to rotate and make the moving plate 7 on the right move to the right. The clamping member 10 will move away from each other during the movement and separate the limit slider 11 from the plastic tube, so that the plastic tube can fall on the upper end of the discharge plate 31 and roll down along the discharge plate 31. At this point, the automatic loading and unloading process of the equipment is completed, which effectively improves the convenience of using the equipment.

[0047] Embodiment 2: This embodiment is as follows Figure 1-Figure 7 As shown, in order to solve the problem that the existing equipment is difficult to stably discharge materials, the working process of the internal pushing structure of the equipment is disclosed, and the effect that the equipment can stably discharge materials is achieved. The specific contents are as follows:

[0048] A pushing structure is provided at the upper end of the operating table 2, and the pushing structure can achieve the effect of stable material unloading of the equipment;

[0049] A push block 13 and a secondary air bag 14 are arranged inside the push structure. The push block 13 is slidably mounted on the upper end of the clamp 10, and the secondary air bag 14 is bonded to one end of the push block 13 close to the clamp 10, and the secondary air bag 14 is located inside the clamp 10;

[0050] A fixed cylinder 15 is fixedly installed on the side of the right moving plate 7 away from the support frame 3, and a support spring 16 is sleeved on the outer side of the fixed cylinder 15, and an extrusion piece 17 is slidably installed inside the fixed cylinder 15, and a main airbag 18 is bonded to the side of the extrusion piece 17 close to the fixed cylinder 15, and the interior of the main airbag 18 is connected with the interior of the auxiliary airbag 14, and the volume of the main airbag 18 is larger than that of the auxiliary airbag 14, and a discharge plate 31 is fixedly installed on the upper right end of the operating table 2;

[0051] An extrusion groove 19 is provided inside the right side of the operating table 2 , and the center line of the extrusion groove 19 and the fixing cylinder 15 are in the same straight line, and two groups of the extrusion groove 19 and the fixing cylinder 15 are provided correspondingly.

[0052] When the device is used for unloading, the moving plate 7 on the right side will move to the right, and the moving plate 7 will drive the two groups of fixed cylinders 15 to move to the right during the movement of the moving plate 7 to the right. The extrusion member 17 will engage with the extrusion groove 19 during the movement of the fixed cylinder 15, and the extrusion groove 19 will cause the extrusion member 17 to slide into the inside of the fixed cylinder 15. During the movement of the extrusion member 17, the main airbag 18 will be squeezed and the main airbag 18 will shrink. At this time, the main airbag 18 will transport gas to the inside of the auxiliary airbag 14 during the shrinkage process, and the auxiliary airbag 14 will expand. The pushing block 13 is pushed to slide outward from the inside of the clamping piece 10, and the two groups of pushing blocks 13 will squeeze the two ends of the plastic tube during the movement. The two ends of the moving groove 20 will move away from each other, which will increase the distance between the clamping pieces 10 and move away from the plastic tube. The pushing block 13 will squeeze the two ends of the plastic tube, thereby separating the plastic tube from the clamping piece 10. At this time, the plastic tube can fall, and in this process the plastic tube will fall smoothly from between the two groups of clamping pieces 10, avoiding the situation where one end of the plastic tube rests on the upper end of the limit slider 11 during the falling process, thereby ensuring the stability of the material unloading of the equipment.

[0053] Embodiment 3: This embodiment is as follows Figure 1 and Figure 8-Figure 9 As shown, in order to solve the problem of low efficiency of the existing equipment in limiting the plastic pipe, the working process of the internal limiting structure of the equipment is disclosed, and the effect of the equipment on efficient limiting and clamping of the plastic pipe is achieved. The specific contents are as follows:

[0054] A limiting structure is provided inside the support frame 3, and the limiting structure can achieve the effect of efficient clamping of the equipment;

[0055] A driving motor 21 is disposed inside the limiting structure, and an output shaft 22 is fixedly mounted on the output end of the driving motor 21, and the output shaft 22 is rotatably connected to the support frame 3, and two sets of driving gears 23 are fixedly mounted on the outer side of the output shaft 22;

[0056] A rotating ring gear 24 is provided inside the limiting structure, and the rotating ring gear 24 is rotatably installed inside the support frame 3, and the outer side of the rotating ring gear 24 is meshed and connected with the driving gear 23, a rotating shaft 25 is rotatably installed inside the driving gear 23, and a driven gear 26 and a connecting gear 27 are fixedly installed on the outer side of the rotating shaft 25, and the driven gear 26 is meshed and connected with the inside of the rotating ring gear 24, a moving tooth plate 28 is slidably installed inside the support frame 3, and the moving tooth plate 28 is meshed and connected with the connecting gear 27, and a fixed block 29 is fixedly installed on one end of the moving tooth plate 28 away from the rotating ring gear 24, and a limiting roller 30 is fixedly installed on the side of the fixed block 29 away from the rotating ring gear 24, and four groups of the limiting roller 30, the moving tooth plate 28 and the rotating shaft 25 are arranged at equal angles about the midpoint of the rotating ring gear 24.

[0057] When the performance testing equipment for plastic pipe processing is used, in the process of the equipment limiting and clamping the plastic pipe, the driving motor 21 needs to be operated, and the driving motor 21 will drive the two sets of driving gears 23 to rotate through the output shaft 22, and the rotating ring gear 24 meshing with it will rotate during the rotation of the driving gear 23. At this time, the rotating ring gear 24 will drive the rotating shaft 25 to rotate through the driven gear 26 meshing with it, and the rotating shaft 25 will drive the connecting gear 27 to rotate during the rotation. At this time, the connecting gear 27 will make the moving tooth plate 28 slide inside the support frame 3, and the moving tooth plate 28 will drive the limiting roller 30 to move through the fixed block 29 during the movement of the moving tooth plate 28 and limit the plastic pipe. In the process of clamping and releasing the plastic pipe, the limiting roller 30 will not contact the limiting member 9 and the clamping member 10. The simultaneous movement of the four sets of limiting rollers 30 effectively improves the efficiency of the equipment in clamping and limiting the plastic pipe, further improves the convenience of using the equipment, and increases the overall practicality.

[0058] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0059] 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 performance testing device for plastic pipe processing, comprising a base (1) and an operating table (2) fixedly mounted on the upper end of the base (1); Features: The operating table (2) further comprises a support frame (3) and a support member (4) fixedly mounted on the upper end thereof, and the support member (4) is located on the left side of the support frame (3); A driving motor (5) is fixedly mounted on the left side of the operating table (2), and a threaded rod (6) is fixedly mounted on the output end of the driving motor (5), and the threaded rod (6) is rotatably connected to the operating table (2), two groups of moving plates (7) are threadedly mounted on the outer side of the threaded rod (6), and a moving cylinder (8) is slidably mounted on the upper end of the moving plate (7), and a limiting member (9) and a clamping member (10) are fixedly mounted on the upper end of the moving cylinder (8), and the clamping member (10) is located on the right side of the limiting member (9); A movement groove (20) is provided at the upper end of the operating table (2), and the clamping member (10) and the limiting member (9) are slidably connected to the operating table (2) via the movement groove (20); A limiting slider (11) is slidably mounted inside the upper ends of the clamping member (10) and the limiting member (9), and a limiting spring (12) is fixedly mounted on one end of the limiting slider (11) close to the clamping member (10) and the limiting member (9), and the limiting spring (12) is fixedly connected to the clamping member (10) and the limiting member (9); A pushing structure is provided at the upper end of the operating table (2), a pushing block (13) and a secondary air bag (14) are provided inside the pushing structure, the pushing block (13) is slidably mounted on the upper end of the clamping member (10), and the secondary air bag (14) is bonded to one end of the pushing block (13) close to the clamping member (10), and the secondary air bag (14) is located inside the clamping member (10); A fixing cylinder (15) is fixedly mounted on a side of the right moving plate (7) away from the supporting frame (3), a supporting spring (16) is sleeved on the outside of the fixing cylinder (15), and an extrusion piece (17) is slidably mounted inside the fixing cylinder (15); A main airbag (18) is bonded to one side of the extrusion member (17) close to the fixing cylinder (15); the interior of the main airbag (18) is connected to the interior of the auxiliary airbag (14); the volume of the main airbag (18) is greater than that of the auxiliary airbag (14); and a discharge plate (31) is fixedly mounted on the upper right side of the operating table (2); An extrusion groove (19) is provided inside the right side of the operating table (2), and the center line of the extrusion groove (19) and the fixed cylinder (15) are in the same straight line, and two groups of the extrusion groove (19) and the fixed cylinder (15) are provided correspondingly; A limiting structure is arranged inside the support frame (3), a driving motor (21) is arranged inside the limiting structure, an output shaft (22) is fixedly mounted on the output end of the driving motor (21), and the output shaft (22) is rotationally connected to the support frame (3), and two sets of driving gears (23) are fixedly mounted on the outer side of the output shaft (22); A rotating gear ring (24) is arranged inside the limiting structure, and the rotating gear ring (24) is rotatably mounted inside the support frame (3), and the outer side of the rotating gear ring (24) is meshedly connected with the driving gear (23), a rotating shaft (25) is rotatably mounted inside the driving gear (23), and a driven gear (26) and a connecting gear (27) are fixedly mounted outside the rotating shaft (25), and the driven gear (26) is meshedly connected with the inside of the rotating gear ring (24), a moving toothed plate (28) is slidably mounted inside the support frame (3), and the moving toothed plate (28) is meshedly connected with the connecting gear (27), and a fixed block (29) is fixedly mounted on one end of the moving toothed plate (28) away from the rotating gear ring (24), and a limiting roller (30) is fixedly mounted on one side of the fixed block (29) away from the rotating gear ring (24), and four groups of the limiting roller (30), the moving toothed plate (28) and the rotating shaft (25) are arranged at equal angles with respect to the midpoint of the rotating gear ring (24).

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