Integrated full-automatic production equipment for clamps

Abstract

This invention relates to the field of clamp manufacturing technology, and in particular to an integrated fully automatic clamp production equipment, comprising: a product conveying system for conveying steel bars to be bent; a feeding and pressing mechanism, the feeding and pressing mechanism including a first clamp and a second clamp, the feeding and pressing mechanism being used to press the corners of the steel bars conveyed by the product conveying system and feed them through the first clamp; a bending device located below the feeding and pressing mechanism, the bending device being used to bend both ends of the steel bar; and a straightening device for compressing and straightening the steel bars after bending at both ends, so that the steel bars are deformed under force; the feeding and pressing mechanism places the steel bars inside the bending device, the bending work is carried out on both sides of the steel bars, and then the feeding and pressing mechanism moves the bent steel bars into the straightening device for compression and straightening work, thereby achieving a fully automatic processing operation of forming steel bars into clamps, replacing manual operation and increasing the quality and efficiency of processing.

Description

Technical Field

[0001] This invention relates to the field of clamp manufacturing technology, and in particular to an integrated fully automated clamp manufacturing equipment. Background Technology

[0002] A clamp is a connecting device used to connect grooved pipe fittings, valves, and pipeline accessories. It is used to tighten quick-connect fittings. These fittings typically include gaskets made of rubber, silicone, or PTFE. They offer good performance, high sealing, and easy installation.

[0003] Existing clamp manufacturing processes involve cutting steel bars into sections and then bending and shaping them. However, these processes still require manual handling of the clamps at different stages, which is time-consuming, labor-intensive, and has a high error rate, thus reducing production efficiency. A search of application CN202110934803.4, which describes a method, equipment, and clamp for manufacturing pipe clamps, reveals that the solution is still based on clamp processing. It lacks the ability to handle loading and unloading after clamp processing. Furthermore, this device can only process one clamp at a time, completing only one clamp shaping process per cycle. The loading and unloading operations still require manual intervention, resulting in a high error rate and reduced production efficiency. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, an integrated fully automated clamp production equipment is provided.

[0005] The specific technical solution is as follows:

[0006] Design an integrated, fully automated clamp production equipment, including:

[0007] The product conveying system is used to transport steel bars to be processed and bent;

[0008] A feeding and corner-pressing mechanism is used to feed and press the corners of the steel bars conveyed by the product conveying system; a bending device is located below the feeding and corner-pressing mechanism and is used to bend both ends of the steel bars.

[0009] A straightening device is used to compress and straighten a steel strip after both ends are bent, so that the steel strip is deformed under force;

[0010] The feeding device is located on one side of the orthopedic device and is used to clamp and feed the orthopedic clamp.

[0011] Preferably, the feeding and corner-pressing mechanism includes:

[0012] A tripod, wherein the two base corners of the tripod are respectively connected to the first clamping block and the second clamping block;

[0013] The top of the tripod is movably connected to a rotating shaft, and the end of the rotating shaft away from the tripod is movably connected to a rotary motor. The rotary motor is located at the bottom of the feeding and pressing angle mechanism.

[0014] The first feeding cylinder is movably connected to the first clamping block, and the first feeding cylinder is used to provide clamping power for the first clamping block;

[0015] The first cylinder is fixedly connected to the tripod, and the bottom of the first cylinder is movably connected to the first feeding cylinder. The first cylinder is used to linearly push the first feeding cylinder.

[0016] The second feeding cylinder is movably connected to the second clamping block, and the second feeding cylinder is used to provide clamping power for the second clamping block;

[0017] The second cylinder is fixedly connected to the end of the tripod away from the second cylinder, and the second cylinder is used to directly push the second feeding cylinder.

[0018] Preferably, the orthopedic device has a rotating wheel on its exterior, a squeezing roller above the rotating wheel, a third cylinder movably connected to the top of the squeezing roller, a drive motor fixedly connected to the back of the orthopedic device, the drive motor movably connected to the rotating wheel, a fourth cylinder below the drive motor, and a limiting plate movably connected to the fourth cylinder, the limiting plate being located below the rotating wheel.

[0019] Preferably, the bending device has a turntable at the top, a shaft is fixedly connected to the top of the turntable, an extrusion block is provided on the back of the shaft, the extrusion block is fixedly connected to the turntable, a baffle is provided on the back of the turntable, the baffle is fixedly connected to the bending device, and a second motor is provided at the bottom of the bending device, the second motor is movably connected to the turntable through the bending device.

[0020] Preferably, the external part of the feeding device is movably connected to a rotary cylinder, one end of the feeding device is provided with a conveying motor, the conveying motor is movably connected to the rotary cylinder, the conveying motor is used to drive the conveying motor to move laterally, the end of the rotary motor away from the feeding device is movably connected to a first motor, the first motor is movably connected to a third clamping block, the third clamping block is used to clamp the formed clamp.

[0021] Preferably, the product conveying system includes a first slide rail, a third motor is provided at the top of the first slide rail, and an extrusion roller is movably connected to the bottom of the third motor.

[0022] Preferably, the product conveying system has a base at its bottom, the base is fixedly connected to the frame, the product conveying system, the feeding and pressing mechanism, the straightening device and the unloading device are located inside the frame, and a control computer is located outside the frame.

[0023] Preferably, the bottom of the feeding device is provided with a fifth cylinder, the fifth cylinder is movably connected to a push plate, the outside of the push plate is provided with a storage rack, the storage rack is located inside the frame, and the two ends of the storage rack are provided with diagonal bars.

[0024] Preferably, the base is fixedly connected to the support frame, the top of the support frame is fixedly connected to the second slide rail, the second slide rail is movably connected to the feeding and pressing mechanism, the first slide rail is located on the back of the second slide rail, and the feeding and pressing mechanism is located in the middle section of the distance between the first slide rail and the orthopedic device.

[0025] Preferably, one end of the orthopedic device is fixedly connected to a fourth slide rail, the outside of the fourth slide rail is movably connected to a telescopic motor, the top of the telescopic motor is movably connected to a limiting roller, and the two ends of the limiting roller are provided with pulleys.

[0026] The above technical solution has the following advantages or beneficial effects:

[0027] 1. A product conveying system is used to transport steel bars to be bent. The feeding and corner-pressing mechanism includes a first clamp and a second clamp. The feeding and corner-pressing mechanism is used to press the corners of the steel bars conveyed by the product conveying system and feed them through the first clamp. The bending device is located below the feeding and corner-pressing mechanism and is used to bend both ends of the steel bars. The straightening device is used to compress and straighten the steel bars after bending both ends so that the steel bars are deformed under force. This device not only integrates the functions of feeding and unloading components for conveying, straightening and unloading steel bars, but also places the steel bars inside the bending device through the feeding and corner-pressing mechanism, bends both sides of the steel bars, and then moves the bent steel bars to the straightening device through the feeding and corner-pressing mechanism for compression and straightening. Then, the unloading device on one side of the straightening device can unload the shaped steel bars. This device uses an integrated computer to issue instructions to each device, thereby achieving a fully automatic processing operation of forming steel bars into clamps, replacing manual operation and increasing the quality and efficiency of processing.

[0028] 2. The feeding and pressing mechanism is equipped with a tripod and two bottom corners connected to a first clamping block and a second clamping block, respectively. The top of the tripod is movably connected to a rotating shaft, and the end of the rotating shaft away from the tripod is movably connected to a rotary motor. During operation, the tripod rotates around the rotating shaft, moving the first clamping block to the pressing block to clamp the steel strip. The second clamping block is positioned above the bending device to clamp the bent steel strip. When the rotating motor rotates the tripod, the first clamping block and the clamped steel strip move above the bending device, and the second clamping block and the clamped steel strip move to the outside of the straightening device for straightening. This cycle repeats, allowing the feeding and pressing mechanism to transport both unprocessed and processed semi-finished products simultaneously, increasing feeding efficiency and improving the device's production capacity. Attached Figure Description

[0029] Embodiments of the invention will be described more fully with reference to the accompanying drawings. However, the drawings are for illustration and explanation only and do not constitute a limitation on the scope of the invention.

[0030] Figure 1 This is a schematic diagram of the structure of an integrated fully automated clamp production equipment proposed in this invention;

[0031] Figure 2 This is a schematic diagram of the internal structure of an integrated fully automated clamp production equipment proposed in this invention;

[0032] Figure 3 This is a schematic diagram of the structure of the second sliding and feeding angle pressing mechanism of the integrated fully automatic clamp production equipment proposed in this invention;

[0033] Figure 4 This is a schematic diagram of the feeding and pressing mechanism of an integrated fully automatic clamp production equipment proposed in this invention;

[0034] Figure 5 This is a schematic diagram of the structure of an integrated fully automated clamp production equipment orthopedic device proposed in this invention;

[0035] Figure 6 This is a schematic diagram of the back structure of the orthopedic device in an integrated fully automated production equipment for clamps proposed in this invention;

[0036] Figure 7 This is a schematic diagram of the material feeding device for an integrated fully automatic clamp production equipment proposed in this invention;

[0037] Figure 8 This is a schematic diagram of the bending device of an integrated fully automatic clamp production equipment proposed in this invention;

[0038] Figure 9 This invention proposes an integrated, fully automated production equipment for clamps. Figure 7 Enlarged schematic diagram of Part A.

[0039] The above reference numerals indicate: 1. Frame; 2. Base; 3. First slide rail; 4. Feeding and pressing angle mechanism; 41. Tripod; 42. Rotary motor; 43. First cylinder; 44. First feeding cylinder; 45. First clamping block; 46. Second feeding cylinder; 47. Second clamping block; 48. Rotating shaft; 49. Straightening device; 5. Third cylinder; 51. Extrusion roller; 52. Rotary wheel; 53. Drive motor; 54. Fourth cylinder; 55. Limiting plate; 56. Unloading device; 6. Conveying motor. 1. Rotary cylinder 62. First motor 63. Third clamping block 64. Fifth cylinder 65. Push plate 66. Bending device 7. Turntable 71. Second motor 72. Shaft 73. Extrusion block 74. Baffle 75. Storage rack 8. Support frame 9. Second slide rail 10. Control computer 11. Third motor 12. Extrusion wheel 13. Fourth motor 14. Third slide rail 15. Telescopic motor 16. Pulley 17. Limiting roller 18. Inclined bar 19. Fourth slide rail 20. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0043] Reference Figure 1-9An integrated fully automatic clamp production equipment includes: a product conveying system for conveying steel bars to be bent; a feeding and corner-pressing mechanism 4 for feeding and corner-pressing the steel bars conveyed by the product conveying system through a first clamping block 45; a bending device 7 located below the feeding and corner-pressing mechanism 4 for bending both ends of the steel bars; a straightening device 5 for compressing and straightening the bent steel bars to cause them to deform under stress; and a discharging device 6 located on one side of the straightening device 5 for clamping and discharging the straightened clamps. This device integrates loading and unloading components for conveying, straightening, and unloading steel bars. The loading and pressing mechanism 4 places the steel bar inside the bending device 7, bending both sides of the bar. Then, the bent steel bar is moved by the loading and pressing mechanism 4 to the straightening device 5 for compression straightening. Finally, the unloading device 6 on one side of the straightening device 5 unloads the shaped steel bar. This device uses an integrated computer to issue unified instructions to all components, achieving fully automated processing of steel bars into clamps, replacing manual operation and increasing processing quality and efficiency.

[0044] Furthermore, the feeding and pressing mechanism 4 includes: a tripod 41, with its two base corners connected to a first clamping block 45 and a second clamping block 48 respectively; a rotating shaft 49 movably connected to the top of the tripod 41; a rotary motor 42 movably connected to the end of the rotating shaft 49 away from the tripod 41; the rotary motor 42 being located at the bottom of the feeding and pressing mechanism 4; a first feeding cylinder 44 movably connected to the first clamping block 45, which provides clamping power to the first clamping block 45; a first cylinder 43 fixedly connected to the tripod 41, with its bottom movably connected to the first feeding cylinder 44, which linearly pushes the first feeding cylinder 44; and a second feeding cylinder 47 movably connected to the second clamping block 48, which provides clamping power to the second clamping block 48. Cylinder 46 is fixedly connected to the end of tripod 41 away from the second cylinder 46. The second cylinder 46 is used to directly push the second feeding cylinder 47. During the operation of this device, tripod 41 will rotate around the pivot 49 to move the first clamping block 45 to the extrusion block 74 to clamp the steel strip. During this process, the second clamping block 48 is located above the bending device 7 and can clamp the bent steel strip. When the tripod 41 is rotated by the rotary motor 42, the first clamping block 45 and the clamped steel strip move to the top of the bending device 7, and then the second clamping block 48 and the clamped steel strip move to the outside of the straightening device 5 for straightening. This cycle repeats, so that the feeding and pressing mechanism 4 can transport unprocessed and processed semi-finished products at the same time, increasing the feeding efficiency and improving the production capacity of this device.

[0045] Furthermore, the straightening device 5 has a rotating wheel 53 on its outside, and a pressing roller 52 on top of the rotating wheel 53. The top of the pressing roller 52 is movably connected to a third cylinder 51. The back of the straightening device 5 is fixedly connected to a drive motor 54, which is movably connected to the rotating wheel 53. Below the drive motor 54 is a fourth cylinder 55, which is movably connected to a limiting plate 56. The limiting plate 56 is located below the rotating wheel 53. The drive motor 54 drives the rotating wheel 53 to rotate. During the rotation of the rotating wheel 53, the steel strip at the top of the rotating wheel 53 is subjected to force and rotates with the rotating wheel 53. It is limited by the pressing roller 52 at the top, so that the straight steel strip forms a circular cavity during the rotation, allowing the bent part to contact, thus completing the straightening process.

[0046] Furthermore, the bending device 7 has a turntable 71 at the top, a shaft 73 is fixedly connected to the top of the turntable 71, an extrusion block 74 is provided on the back of the shaft 73, the extrusion block 74 is fixedly connected to the turntable 71, a baffle 75 is provided on the back of the turntable 71, the baffle 75 is fixedly connected to the bending device 7, and a second motor 72 is provided at the bottom of the bending device 7. The second motor 72 passes through the bending device 7 and is movably connected to the turntable 71. When the steel bar is located between the shaft 73 and the baffle 75, the extrusion block 74 at the top of the bending device 7 rotates to extrude the steel bar, and the shaft 73 limits one end of the steel bar at the center, so that the end of the steel bar is bent by force. Two or more bending devices 7 can be set to simultaneously bend both ends of the steel bar.

[0047] Furthermore, the external part of the feeding device 6 is movably connected to the rotary cylinder 62. One end of the feeding device 6 is provided with a conveying motor 61, which is movably connected to the rotary cylinder 62. The conveying motor 61 is used to drive the conveying motor 62 to move laterally. The end of the rotary motor 42 away from the feeding device 6 is movably connected to the first motor 63. The first motor 63 is movably connected to the third clamping block 64, which is used to clamp the formed clamp. The third clamping block 64 outside the feeding device 6 is moved to the outside of the straightening device 5 by the drive of the conveying motor 61 to clamp the formed clamp. The third clamping block 64 holding the clamp is then moved to one side of the storage rack 8 by the conveying motor 61.

[0048] Furthermore, the product conveying system includes a first slide rail 3, a third motor 12 is provided on the top of the first slide rail 3, and a pressing wheel is movably connected to the bottom of the third motor 12. The pressing wheel is used to press the moving steel bar and limit its movement to prevent the steel bar from leaving the track during the movement.

[0049] Furthermore, the bottom of the product conveying system is provided with a base 2, which is fixedly connected to the frame 1. The product conveying system, the feeding and pressing mechanism 4, the straightening device 5 and the unloading device 6 are located inside the frame 1. The outside of the frame 1 is provided with a control computer 11, which includes multiple control modules to perform fixed-point control on the cylinder and motor structures of each device.

[0050] Furthermore, the bottom of the feeding device 6 is equipped with a fifth cylinder 65, which is movably connected to a push plate 66. The outside of the push plate 66 is equipped with a storage rack 8, which is located inside the frame 1. The storage rack 8 is equipped with diagonal bars 19 at both ends. The diagonal bars 19 at both ends of the storage rack 8 can provide placement points for the processed clamps. The bottom of the storage rack 8 is equipped with casters, which can move the storage rack 8 for subsequent operations when it is full of clamps.

[0051] Furthermore, the base 2 is fixedly connected to the support frame 9, the top of the support frame 9 is fixedly connected to the second slide rail 10, the second slide rail 10 is movably connected to the feeding and pressing mechanism 4, the first slide rail 3 is located on the back of the second slide rail 10, and the feeding and pressing mechanism 4 is located in the middle section of the distance between the first slide rail 3 and the straightening device 5. The feeding and pressing mechanism 4 can be driven by a motor set at one end of the second slide rail 10 to move laterally outside the second slide rail 10, thereby adjusting the angle at which the feeding and pressing mechanism 4 clamps the steel strip.

[0052] Furthermore, one end of the straightening device 5 is fixedly connected to the fourth slide rail 20, the outside of the fourth slide rail 20 is movably connected to the telescopic motor 16, the top of the telescopic motor 16 is movably connected to the limiting roller 18, and the two ends of the limiting roller 18 are provided with pulleys 17. The limiting roller 18 at the top of the fourth slide rail 20 can squeeze and limit the steel bar located inside the straightening device 5, so as to maintain the stability of the steel bar's movement during the rotational deformation process.

[0053] Working principle: During operation, the steel bar is first conveyed to the area below the extrusion roller by an external steel bar conveyor. The third motor 12 controls the contact force between the extrusion roller and the steel bar to limit its movement. The control computer 11 issues a working command to activate the rotary motor 42, which drives the tripod 41 to rotate via the shaft 49. Rotating the first clamping block 45 moves it to the outside of the extrusion block 74, and the second clamping block 48 moves it to the top of the bending device 7. The first cylinder 43 is opened, pushing the first feeding cylinder 44 and the clamping blocks to the outside of the steel strip. Then, the first feeding cylinder 44 controls the symmetrical first clamping blocks 45 to tighten inwards, squeezing and clamping the steel strip. The rotating motor 42 drives the tripod 41 to rotate, causing the first clamping block 45 to move to the top of the bending device 7. The first cylinder 43 and the first feeding cylinder 44 then place the steel strip between the shaft 73 and the baffle 75. The second motor 72 is opened, driving the turntable 71 and the extrusion block 74 to rotate, bending both ends of the steel strip. Then, the second cylinder 46 drives the second feeding cylinder 47 and the second clamping block 48 to clamp the bent steel strip, and the tripod 41 is rotated, causing the second clamping block 48 to move the steel strip to the rotating wheel 53 and the extrusion roller 52. In between, upon receiving the instruction, the third cylinder 51 pushes the extrusion roller 52 into close contact with the steel strip, and then the drive motor 54 is turned on to drive the rotating wheel 53 to rotate. During the rotation of the rotating wheel 53, the steel strip at the top is subjected to force and rotates with the rotating wheel 53. It is limited by the extrusion roller 52 at the top, so that the straight steel strip forms a circular cavity during the rotation, so that the bent part contacts, thus completing the straightening process. Then, the third clamping block 64 outside the unloading device 6 is moved to the outside of the straightening device 5 by the drive of the conveying motor 61 to clamp the formed clamp. The conveying motor 61 moves the third clamping block 64 holding the clamp to one side of the storage rack 8. The fifth cylinder 65 pushes the clamp held by the third clamping block 64 to the outside of the inclined bar 19 through the push plate 66 to hang it up, thus completing the processing.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated, fully automated clamp production equipment, characterized in that: include: The product conveying system is used to transport steel bars to be processed and bent; The feeding and corner pressing mechanism (4) is used to feed and press the corners of the steel bars conveyed by the product conveying system; The bending device (7) is located below the feeding and pressing mechanism (4) and is used to bend both ends of the steel strip. The straightening device (5) is used to compress and straighten the steel strip after bending at both ends so that the steel strip is deformed under force. The feeding device (6) is located on one side of the straightening device (5). The feeding device (6) is used to clamp and feed the straightened clamp. The feeding and pressing mechanism (4) includes: a first clamping block (45) and a second clamping block (48); Tripod (41), the two bottom corners of the tripod (41) are respectively connected to the first clamp (45) and the second clamp (48); The top of the tripod (41) is movably connected to a rotating shaft (49), and the end of the rotating shaft (49) away from the tripod (41) is movably connected to a rotary motor (42). The rotary motor (42) is located at the bottom of the feeding and pressing angle mechanism (4). The first feeding cylinder (44) is movably connected to the first clamping block (45), and the first feeding cylinder (44) is used to provide clamping power for the first clamping block (45); The first cylinder (43) is fixedly connected to the tripod (41), and the bottom of the first cylinder (43) is movably connected to the first feeding cylinder (44). The first cylinder (43) is used to linearly push the first feeding cylinder (44). The second feeding cylinder (47) is movably connected to the second clamping block (48), and the second feeding cylinder (47) is used to provide clamping power for the second clamping block (48); The second cylinder (46) is fixedly connected to the end of the tripod (41) away from the second cylinder (46), and the second cylinder (46) is used to directly push the second feeding cylinder (47). The external of the feeding device (6) is movably connected to a rotary cylinder (62). One end of the feeding device (6) is provided with a conveying motor (61). The conveying motor (61) is movably connected to the rotary cylinder (62). The conveying motor (61) is used to drive the conveying motor (61) to move laterally. The end of the rotary motor (42) away from the feeding device (6) is movably connected to a first motor (63). The first motor (63) is movably connected to a third clamping block (64). The third clamping block (64) is used to clamp the formed clamp. The product conveying system is provided with a base (2) at the bottom, the base (2) is fixedly connected to the frame (1), the bottom of the unloading device (6) is provided with a fifth cylinder (65), the fifth cylinder (65) is movably connected to the push plate (66), the outside of the push plate (66) is provided with a storage rack (8), the storage rack (8) is located inside the frame (1), and the two ends of the storage rack (8) are provided with diagonal rods (19).

2. The fully automatic clamp production equipment according to claim 1, characterized in that: The orthopedic device (5) has a rotating wheel (53) on its outside. A squeezing roller (52) is provided above the rotating wheel (53). A third cylinder (51) is movably connected to the top of the squeezing roller (52). A drive motor (54) is fixedly connected to the back of the orthopedic device (5). The drive motor (54) is movably connected to the rotating wheel (53). A fourth cylinder (55) is provided below the drive motor (54). The fourth cylinder (55) is movably connected to a limiting plate (56). The limiting plate (56) is located below the rotating wheel (53).

3. The fully automatic clamp production equipment according to claim 1, characterized in that: The bending device (7) has a turntable (71) at the top, a shaft (73) is fixedly connected to the top of the turntable (71), an extrusion block (74) is provided on the back of the shaft (73), the extrusion block (74) is fixedly connected to the turntable (71), a baffle (75) is provided on the back of the turntable (71), the baffle (75) is fixedly connected to the bending device (7), and a second motor (72) is provided at the bottom of the bending device (7), the second motor (72) passes through the bending device (7) and is movably connected to the turntable (71).

4. The fully automatic clamp production equipment according to claim 1, characterized in that: The product conveying system includes a first slide rail (3), a third motor (12) is provided on the top of the first slide rail (3), and an extrusion block (74) is movably connected to the bottom of the third motor (12).

5. The fully automatic clamp production equipment according to claim 4, characterized in that: The product conveying system, the feeding and pressing mechanism (4), the straightening device (5) and the unloading device (6) are located inside the frame (1), and a control computer (11) is provided outside the frame (1).

6. The fully automatic clamp production equipment according to claim 5, characterized in that: The base (2) is fixedly connected to the support frame (9), and the top of the support frame (9) is fixedly connected to the second slide rail (10). The second slide rail (10) is movably connected to the feeding and pressing mechanism (4). The first slide rail (3) is located on the back of the second slide rail (10), and the feeding and pressing mechanism (4) is located in the middle section of the distance between the first slide rail (3) and the orthopedic device (5).

7. The fully automatic clamp production equipment according to claim 1, characterized in that: One end of the orthopedic device (5) is fixedly connected to the fourth slide rail (20), the fourth slide rail (20) is movably connected to the telescopic motor (16), the top of the telescopic motor (16) is movably connected to the limiting roller (18), and the two ends of the limiting roller (18) are provided with pulleys (17).

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