Lumbar vertebra and cervical vertebra traction rehabilitation body builder
By designing a horizontal lumbar and cervical traction rehabilitation fitness device, and utilizing support structures such as a hip seat and leg rest, as well as servo motor adjustment, precise traction of the lumbar and cervical spine is achieved. This solves the problem of the limited functionality of existing equipment and improves the traction effect and ease of use.
Patent Information
- Application Number
- CN202511146026.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2025-11-25
AI Technical Summary
Existing lumbar and cervical traction rehabilitation devices are designed to be upright, which is inconvenient to use, has poor traction effect, cannot provide integrated rehabilitation for the lumbar and cervical spine at the same time, and lacks massage function.
A lumbar and cervical traction rehabilitation fitness device was designed, which includes a base and traction components. Patients can undergo traction in a supine position. Through the support structure such as the buttock seat, leg support, and bracket, combined with the adjustment of servo motor and electric push rod, precise traction of the lumbar and cervical spine can be achieved, adapting to the physiological structure and rehabilitation stage needs of different patients.
It improves the accuracy and recovery effect of lumbar and cervical traction, reduces fatigue when standing, achieves simultaneous traction of lumbar and cervical spine, adapts to the needs of different body types and rehabilitation stages, and has integrated rehabilitation functions.
Smart Images

Figure CN121003516A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical assistive device technology, and more specifically, to a traction rehabilitation and fitness device for the lumbar and cervical spine. Background Technology
[0002] Lumbar and cervical spondylosis are common conditions. Traction therapy applies external force to a part of the body or joint, causing some separation and appropriate stretching of surrounding soft tissues, thereby achieving a therapeutic goal. Spinal traction therapy usually refers to using external force to pull the lumbar spine and pelvis to achieve a therapeutic purpose, hence the name lumbar traction. Traction is also an effective method for treating cervical spondylosis, as it can separate the cervical vertebrae, reduce the pressure of intervertebral discs on other tissues, and increase the stability of the cervical spine.
[0003] Existing lumbar and cervical traction rehabilitation devices are all upright, requiring users to stand while using them. Their traction effect is poor, and the recovery effect is also poor. They also do not have the effect of massage rehabilitation, making them inconvenient to use. Furthermore, the traction devices are usually standalone and cannot achieve simultaneous traction of the lumbar and cervical spine. Therefore, a lumbar and cervical traction rehabilitation device is provided. Summary of the Invention
[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a lumbar and cervical traction rehabilitation fitness device, which aims to solve the problems mentioned in the background art.
[0005] The present invention provides the following technical solution: a lumbar and cervical traction rehabilitation fitness device, including a base, on which a traction component is provided; The traction assembly includes a protective cover disposed on the top of the base, a bracket disposed in the middle of the protective cover, and a mounting plate disposed in the middle of the bracket; An arc seat is rotatably connected to the middle of the mounting plate, and a gear plate is rotatably connected inside the arc seat. A first hinge rod is provided at both ends of the gear plate, and a vertical plate is provided at one end of each of the first hinge rods. A tripod is provided at the top of each of the two vertical plates, and two traction wheels are rotatably connected to each tripod. A rotating shaft is provided on one side of the gear disk. The rotating shaft is rotatably connected to the arc seat. Connecting seats are fixedly provided at both ends of the rotating shaft, and a second hinge rod is hinged to one end of each connecting seat. One end of the second hinge rod extends to the vertical plate and is hinged to the vertical plate.
[0006] Optionally, in a possible implementation, one end of the bracket is hinged to a hip seat, the end of the hip seat away from the bracket is hinged to a leg rest, the bottom of the hip seat is hinged to a gear ring, the output end of the second electric push rod is provided with an adjusting rod, the bottom end of the adjusting rod is rotatably connected to the leg rest, the adjusting rod is hinged to the hip seat, the outer side of the hip seat is covered with a first support frame, the first support frame is installed in the protective cover by bolts, the outer side of the bracket is hinged to a third support frame, the bottom end of the third support frame is hinged to a second support frame, the second support frame is located at the top of the base and is slidably connected to the base, and the bottom of the first support frame is provided with a first electric push rod for driving the displacement of the second support frame; Optionally, in a possible implementation, a third electric push rod is provided at the bottom end of the arc seat, and the output end of the third electric push rod extends to the bottom of the gear plate and meshes with the gear plate; Optionally, in a possible implementation, a motor is provided on one side of the bottom of the mounting plate, and pulleys are respectively provided on the output end and the rotating shaft of the motor, and the two pulleys are connected by belt drive. Optionally, in a possible implementation, a first servo motor is provided at one end of the mounting plate, and a gear rod is provided at the output end of the first servo motor. The gear rod is rotatably connected to the mounting plate, and the gear rod is located at one end of the arc seat and meshes with the arc seat. Optionally, in a possible implementation, the mounting plate is rotatably connected to two limit wheels at both ends, each limit wheel is provided with a rack at both ends, both racks are embedded in the middle of the bracket, and one of the limit wheels is provided with a gear ring at both ends, the gear ring meshes with the rack, and a second servo motor for driving the limit wheel to rotate is provided on one side of the bottom of the gear ring.
[0007] The technical effects and advantages of this invention are as follows: 1. This invention, by setting up support structures such as a buttock seat, leg support, and bracket, allows patients to adopt a supine posture for traction, making the body more relaxed and the force stable. It can effectively improve the accuracy and recovery effect of lumbar and cervical traction, while reducing the fatigue of standing. 2. This invention allows the traction wheel to be precisely aligned with the lumbar or cervical spine by moving the mounting plate horizontally along the rack; combined with the angle adjustment of the arc seat and the posture control of the traction wheel, it can simultaneously apply appropriate traction force to the lumbar and cervical spine, achieving integrated rehabilitation and solving the problem of the single function of existing equipment.
[0008] 3. This invention enables leg and waist posture adjustment. The leg support angle is adjusted by the second electric push rod, and the angle between the support and the buttock seat is adjusted by the first electric push rod, which can adapt to the leg curvature and lumbar physiological curve of different patients. Traction angle and force control: The arc seat angle is adjusted by the first servo motor, and the angle and spacing of the traction wheel are adjusted in conjunction with the gear plate and various hinge rods, which can adapt to the physiological structure of cervical lordosis and lumbar kyphosis, and meet the traction needs of different body types and rehabilitation stages. In summary, through the coordinated use of various structures, patients can undergo traction in a supine position, resulting in greater relaxation and stable force application. This effectively improves the accuracy and recovery effect of lumbar and cervical traction while reducing fatigue from standing. It can adapt to different patients' leg curvature and lumbar physiological curves. Traction angle and force adjustment: The angle of the arc seat is adjusted by the first servo motor, and the angle and spacing of the traction wheels are adjusted in conjunction with the gear plate and various articulated rods. This adapts to the physiological structures of cervical lordosis and lumbar kyphosis, meeting the traction needs of different body types and rehabilitation stages. It can simultaneously apply appropriate traction force to the lumbar and cervical spine, achieving integrated rehabilitation and solving the problem of the single function of existing equipment. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.
[0010] Figure 1 This is a front view of the overall structure of the present invention.
[0011] Figure 2 This is a side view of the overall structure of the present invention.
[0012] Figure 3 This is a schematic diagram of the bracket, mounting plate, rack, and traction wheel of the present invention.
[0013] Figure 4 This is a schematic diagram of the bracket and rack of the present invention.
[0014] Figure 5 This is a schematic diagram of the mounting plate, arc seat, upright plate, tripod, and traction wheel of the present invention.
[0015] Figure 6 This is a schematic diagram of the mounting plate, the second servo motor, the gear ring, and the limit wheel of the present invention.
[0016] Figure 7This is a schematic diagram of the motor, gear plate, first hinge rod, second hinge rod, upright plate, tripod, and traction wheel of the present invention.
[0017] Figure 8 This is a schematic diagram of the arc seat, the first servo motor, the gear rod, and the third electric push rod of the present invention.
[0018] The attached diagram is labeled as follows: 1. Base; 2. Protective cover; 3. Bracket; 4. Mounting plate; 5. Arc seat; 6. Gear plate; 7. First hinge rod; 8. Vertical plate; 9. Triangle frame; 10. Traction wheel; 11. Rotating shaft; 12. Connecting seat; 13. Second hinge rod; 14. First support frame; 15. Second support frame; 16. Third support frame; 17. First electric push rod; 18. Second electric push rod; 19. Adjusting rod; 20. Leg rest; 21. Pulley; 22. Hip seat; 23. Third electric push rod; 24. Motor; 25. Pulley; 26. First servo motor; 27. Gear rod; 28. Gear ring; 29. Limit wheel; 30. Second servo motor; 31. Rack. Detailed Implementation
[0019] 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.
[0020] As attached Figure 1 - Figure 8 The lumbar and cervical traction rehabilitation and fitness device shown allows patients to undergo traction in a supine position via the traction components on the base 1. This provides greater relaxation and stable force application, effectively improving the accuracy and recovery effect of lumbar and cervical traction while reducing fatigue from standing. It can adapt to different patients' leg curvature and lumbar physiological curves. Traction angle and force adjustment: The angle of the arc seat 5 is adjusted by the first servo motor 26, and the angle and spacing of the traction wheels 10 are adjusted in conjunction with the gear plate 6 and various hinge rods. This adapts to the physiological structures of cervical lordosis and lumbar kyphosis, meeting the traction needs of different body types and rehabilitation stages. It can simultaneously apply appropriate traction force to the lumbar and cervical spine, achieving integrated rehabilitation and solving the problem of the single function of existing equipment. The specific structural settings of the components are as follows. The traction assembly includes a protective cover 2 mounted on top of the base 1, a bracket 3 located in the middle of the protective cover 2, and a mounting plate 4 located in the middle of the bracket 3, as shown in the attached diagram. Figure 3As shown, the mounting plate 4 is positioned in the middle of the protective cover 2 via a bracket 3 for traction of the patient's cervical or lumbar spine. An arc seat 5 is rotatably connected to the middle of the mounting plate 4, and a gear disc 6 is rotatably connected within the arc seat 5. First hinge rods 7 are respectively installed at both ends of the gear disc 6, and a vertical plate 8 is installed at one end of each of the first hinge rods 7. Tripods 9 are respectively installed at the top of the two vertical plates 8, and two traction wheels 10 are rotatably connected to each tripod 9. (See attached diagram.) Figure 7 As shown, the rotation of the gear disc 6 drives the first hinge rod 7 to rotate. When the first hinge rod 7 rotates, it adjusts the angles of the upright plate 8, the tripod 9, and the traction wheel 10, allowing the traction wheel 10 to contact the patient's cervical or lumbar spine for traction. A rotating shaft 11 is provided on one side of the gear disc 6, rotatably connected to the arc seat 5. Connecting seats 12 are fixedly provided at both ends of the rotating shaft 11, and a second hinge rod 13 is hinged to one end of each connecting seat 12. One end of the second hinge rod 13 extends to the upright plate 8 and is hinged to the upright plate 8, as shown in the attached diagram. Figure 7 As shown, the rotation of the pivot 11 drives the connecting seat 12 to rotate, thereby adjusting the angle of the second hinge rod 13. The second hinge rod 13 pulls the upright plate 8 through the first hinge rod 7 to adjust the angle on the side of the gear plate 6, thereby realizing the function of adjusting the angle of the upright plate 8, the tripod 9 and the traction wheel 10. It can also adjust the distance between the two upright plates 8 so that when the upright plate 8 is located at the patient's cervical or lumbar spine, the traction wheel 10 can be adjusted to abut against the patient to perform expansion traction.
[0021] One end of the bracket 3 is hinged to a hip seat 22, the end of the hip seat 22 away from the bracket 3 is hinged to a leg rest 20, and the bottom of the hip seat 22 is hinged to a gear ring 28, as shown in the attached figure. Figure 1 and 2 As shown, by adjusting the angles of the buttock seat 22 and the leg support 20, the leg support 20 can support the patient's legs when the patient lies on the support 3, allowing the patient's buttocks and waist to bend for traction; the output end of the second electric push rod 18 is equipped with an adjusting rod 19, the bottom end of which is rotatably connected to the leg support 20. The adjusting rod 19 is hinged to the buttock seat 22, as shown in the attached figure. Figure 2 As shown, the adjusting rod 19 is deflected by the second electric push rod 18, and the pulley 21 can abut against one side of the leg support 20, thereby allowing the angle of the leg support 20 to be adjusted; the outer side of the buttock seat 22 is covered with a first support frame 14, which is bolted to the protective cover 2; the outer side of the bracket 3 is hinged with a third support frame 16, and the bottom end of the third support frame 16 is hinged with a second support frame 15. The second support frame 15 is located at the top of the base 1 and is slidably connected to the base 1; and the bottom of the first support frame 14 is provided with a first electric push rod 17 for driving the displacement of the second support frame 15, as shown in the attached figure. Figure 2As shown, the second support frame 15 is displaced by the first electric push rod 17. When the second support frame 15 is displaced, the support point of the third support frame 16 is changed, thereby realizing the function of adjusting the angle between the third support frame 16 and the bracket 3, so as to adjust the bending angle between the bracket 3 and the buttock seat 22, so that the lumbar spine can present different bending shapes when the patient lies on the bracket 3.
[0022] A motor 24 is installed on one side of the bottom of the mounting plate 4. A pulley 25 is installed on the output end of the motor 24 and on the rotating shaft 11, and the two pulleys 25 are connected by a belt drive, as shown in the attached diagram. Figure 7 As shown, the motor 24 serves as the power source, and the corresponding use of the pulley 25 and belt drives the rotating shaft 11 to rotate, so that the bottom connecting seat 12 and the second hinge rod 13 can rotate when the rotating shaft 11 rotates, so that the angle of the upright plate 8 and the first hinge rod 7 can be adjusted when the second hinge rod 13 rotates.
[0023] A first servo motor 26 is provided at one end of the mounting plate 4. A gear rod 27 is provided at the output end of the first servo motor 26. The gear rod 27 is rotatably connected to the mounting plate 4. The gear rod 27 is located at one end of the arc seat 5 and meshes with the arc seat 5, as shown in the attached figure. Figure 8 As shown, the gear rod 27 is driven to rotate by the first servo motor 26. When the gear rod 27 rotates, it meshes with the arc seat 5, thereby driving the various structures on the arc seat 5 to adjust their positions so that the tripod 9 and the traction wheel 10 can contact the patient for traction.
[0024] The mounting plate 4 has two rotatably connected limit wheels 29 at its two ends. Each limit wheel 29 has a rack 31 at both ends, and both racks 31 are embedded in the middle of the bracket 3. One of the limit wheels 29 has a gear ring 28 at both ends, which meshes with the rack 31. A second servo motor 30 for driving the limit wheel 29 to rotate is provided on one side of the bottom of the gear ring 28. (See attached figure) Figure 4 and 6 As shown, the limiting wheel 29, which is equipped with a gear ring 28, is driven to rotate by the second servo motor 30. The gear ring 28 meshes with the rack 31, thereby realizing the function of adjusting the position of the mounting plate 4 on the bracket 3, so as to facilitate traction of the patient's lumbar or cervical spine.
[0025] The specific working principle is as follows: when the patient's leg is placed on the leg rest 20, the second electric push rod 18... Figure 2As shown, the output end of the lever 19 acts as a power source, driving the adjusting rod 19. Since one end of the adjusting rod 19 is hinged to the buttock seat 22 and the other end contacts the leg support 20, the extension and retraction of the adjusting rod 19 causes the leg support 20 to rotate around the hinge point of the buttock seat 22, thereby changing the angle between the leg support 20 and the buttock seat 22. The angle can be adapted to the patient's height, such as 0°-90°. During this process, the buttock seat 22 is fixed inside the protective cover 2 by the first support frame 14. Figure 2 As shown, this ensures the stability of the leg support during adjustment, preventing swaying that could affect traction accuracy.
[0026] The support bracket 3 is the main support component for the patient's lower back. It is hinged to the buttock seat 22, and its bottom is connected to the second support bracket 15 via the third support bracket 16. Figure 2 As shown, when the first electric push rod 17 drives the second support frame 15 to slide horizontally along the base 1, the bottom end of the third support frame 16 moves with the second support frame 15, and the top end pushes the bracket 3 to rotate around the hinge point with the hip seat 22, thereby changing the angle between the bracket 3 and the hip seat 22, such as 120°-180°. This adjustment allows the patient's lumbar spine to be in a natural curved or moderately stretched state, providing a basic posture that conforms to the body curve for subsequent traction.
[0027] The first support frame 14, which covers the outer side of the buttock seat 22, is fixed inside the protective cover 2 by bolts. Figure 2 As shown, this ensures rigid support for the patient's buttocks when placed; simultaneously, the gear ring 28 hinged to the bottom of the buttock seat 22, as... Figure 6 As shown, it can be used in conjunction with other transmission components to assist in fine-tuning the horizontal angle of the buttock seat 22, preventing the patient from tilting to the side and further improving support stability.
[0028] Mounting plate 4 supports core components such as traction wheel 10. Its position must be precisely aligned with the traction area, such as the cervical or lumbar spine, which is achieved through the following transmission: Second servo motor 30 Figure 6 The drive output gear ring 28 is shown to rotate, and the gear ring 28 meshes with the rack 31 embedded in the middle of the bracket 3 as shown. Figure 4 As shown, this drives the mounting plate 4 to move along the rack 31. Simultaneously, the limiting wheels 29 at both ends of the mounting plate 4... Figure 6 As shown, the rollers roll along the rack 31, which not only limits the vertical offset of the mounting plate 4 but also reduces the moving friction, ensuring the moving accuracy of the mounting plate 4 and making the traction wheel 10 accurately aligned with the cervical or lumbar spine. The first servo motor 26 Figure 8 The drive gear 27 rotates as shown, meshing with the teeth on the arc seat 5, causing the arc seat 5 to rotate around the center of the mounting plate 4. This adjustment can change the overall tilt direction of the traction wheel 10, making the traction wheel 10 conform to the physiological curve of the cervical spine lordosis or lumbar spine kyphosis, avoiding additional pressure on the bones during traction.
[0029] Motor 24 Figure 7 As shown, the output pulley 25 and the pulley 25 on the rotating shaft 11 form a belt drive, driving the rotating shaft 11 to rotate; at the same time, the third electric push rod 23... Figure 8 The output end shown is a rack and pinion structure that meshes with the gear disc 6, driving the gear disc 6 to rotate within the arc seat 5. When the gear disc 6 rotates, the first hinge rods 7 at both ends swing synchronously, causing the upright plate 8 to rotate around the edge of the gear disc 6. Simultaneously, the rotating shaft 11 rotates, causing the connecting seats 12 at both ends to rotate, causing the second hinge rod 13 to pull the upright plate 8. The hinge point between the second hinge rod 13 and the upright plate 8 is offset from the connection point of the first hinge rod 7. The synergistic effect of the two sets of forces allows the triangular frame 9 at the top of the upright plate 8 and the traction wheel 10 to achieve multi-angle adjustment, such as forward tilting, backward tilting, and side tilting, ensuring uniform contact area between the traction wheel 10 and the skin. By controlling the rotation difference between the gear disc 6 and the rotating shaft 11, the distance between the two upright plates 8 can be changed. When the distance increases, the traction wheel 10 applies an outward pulling force to both sides of the cervical or lumbar spine, achieving expansion traction; when the distance decreases, an inward converging force can be applied to adapt to the bone width of different patients.
[0030] When simultaneous traction of the lumbar and cervical spine is required: Adjust the angle between the bracket 3 and the buttock seat 22 to 120°-150° via the first electric push rod 17, so that the patient's lumbar spine is in a natural stretched state; The control mounting plate 4 moves along the rack 31, so that a set of traction wheels 10 are aligned with both sides of the lumbar spine. The gear plate 6 is adjusted by the third electric push rod 23 to apply lumbar traction force. Simultaneously, the first servo motor 26 drives the arc seat 5 to rotate upward, aligning the traction wheel 10 with both sides of the cervical spine. The rotating shaft 11 is adjusted by the motor 24 to apply cervical traction force. Differential traction for the lumbar and cervical spine can also be achieved by controlling the output power of the motor 24 and the third electric push rod 23.
[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. Lumbar and cervical vertebrae traction rehabilitation fitness equipment, comprising a base (1), characterized in that: The base (1) is provided with a traction assembly; The traction assembly comprises a protective cover (2) provided on the top of the base (1), a bracket (3) is provided on the middle of the protective cover (2), and an installation plate (4) is provided on the middle of the bracket (3); An arc seat (5) is rotationally connected to the middle of the installation plate (4), a gear disc (6) is rotationally connected to the arc seat (5), first hinged rods (7) are respectively provided on the two ends of the gear disc (6), a vertical plate (8) is provided on one end of each of the first hinged rods (7), a tripod (9) is provided on the top of each of the two vertical plates (8), and two traction wheels (10) are respectively rotationally connected to each of the tripods (9); A rotating shaft (11) is provided on one side of the gear disc (6), the rotating shaft (11) is rotationally connected to the arc seat (5), connecting seats (12) are fixedly provided on the two ends of the rotating shaft (11), second hinged rods (13) are hingedly connected to one end of each of the connecting seats (12), and one end of each of the second hinged rods (13) extends to and is hingedly connected to the vertical plate (8).
2. The lumbar and cervical spine traction rehabilitation exercise apparatus as claimed in claim 1, wherein: One end of the bracket (3) is hingedly connected to a hip seat (22), one end of the hip seat (22) away from the bracket (3) is hingedly connected to a leg support (20), and the bottom of the hip seat (22) is hingedly connected to a gear ring (28).
3. The lumbar and cervical spine traction rehabilitation exercise apparatus as claimed in claim 2, wherein: The output end of the second electric push rod (18) is provided with an adjusting rod (19), the bottom end of the adjusting rod (19) is rotationally connected to the leg support (20), and the adjusting rod (19) is hingedly connected to the hip seat (22).
4. The lumbar and cervical spine traction rehabilitation exercise apparatus as claimed in claim 2, wherein: The outer side of the hip seat (22) is covered with a first support frame (14), the first support frame (14) is installed in the protective cover (2) through bolts, the outer side of the bracket (3) is hingedly connected to a third support frame (16), the bottom end of the third support frame (16) is hingedly connected to a second support frame (15), the second support frame (15) is located on the top of the base (1) and is slidingly connected to the base (1), and the bottom of the first support frame (14) is provided with a first electric push rod (17) for driving the displacement of the second support frame (15).
5. The lumbar and cervical spine traction rehabilitation exercise machine as claimed in claim 1 wherein: The bottom end of the arc seat (5) is provided with a third electric push rod (23), the output end of the third electric push rod (23) extends to the bottom of the gear disc (6) and is engaged with the gear disc (6).
6. The lumbar and cervical spine traction rehabilitation exercise machine as claimed in claim 1 wherein: The bottom side of the installation plate (4) is provided with a motor (24), belt pulleys (25) are respectively provided on the output end of the motor (24) and the rotating shaft (11), and the two belt pulleys (25) are drivingly connected through a belt.
7. The lumbar and cervical spine traction rehabilitation exercise machine as claimed in claim 1 wherein: One end of the installation plate (4) is provided with a first servo motor (26), the output end of the first servo motor (26) is provided with a gear rod (27), the gear rod (27) is rotationally connected to the installation plate (4), and the gear rod (27) is located at one end of the arc seat (5) and is engaged with the arc seat (5).
8. The lumbar and cervical spine traction rehabilitation exercise machine as claimed in claim 1 wherein: Both ends of the mounting plate (4) are rotationally connected with a limiting wheel (29), both ends of each limiting wheel (29) are provided with a rack (31), both racks (31) are embedded in the middle of the bracket (3), and both ends of one limiting wheel (29) are provided with a gear ring (28), the gear ring (28) is engaged with the rack (31), and the bottom side of the gear ring (28) is provided with a second servo motor (30) for driving the limiting wheel (29) to rotate.
Citation Information
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