Cart walking mechanism

Abstract

The utility model discloses a cart walking mechanism which comprises a walking frame and horizontal walking rails arranged below the walking frame, pulley devices are arranged between the four corners of the lower end face of the walking frame and the corresponding walking rails, the upper end of each pulley device is connected with the walking frame, and the lower end of each pulley device is connected with the corresponding walking rail. The left and right ends of each group of balance beams are connected with two groups of rollers, each group of rollers are circumferentially provided with annular grooves, and the upper parts of the walking rails are matched with the corresponding annular grooves; damping parts are arranged on the front sides and the rear sides of the idler wheels and used for relieving impact of the side walls of the annular grooves on the walking rails when the idler wheels move on the arc-shaped walking rails, and a driving mechanism is further arranged on the outer side of each pulley device and used for driving the corresponding idler wheel to rotate. When the cart traveling mechanism moves along the bent traveling track, the impact of the side wall of the roller ring groove on the traveling track is relieved, the service life of the rollers and the traveling track is prolonged, and meanwhile vibration of the cart traveling mechanism in the traveling process is relieved.

Description

Technical Field

[0001] This utility model relates to the field of lifting equipment technology, and in particular to a trolley traveling mechanism. Background Technology

[0002] Typically, the trolley traveling mechanism is a crucial component of a bridge crane, consisting of multiple parts including a motor, drive shaft, reducer, rollers, and brakes. Because bridge cranes are often installed above doors, warehouses, docks, or freight yards, and sometimes even in open-air environments, they have a high center of gravity and are exposed to wind and rain. Therefore, the trolley traveling mechanism, located beneath the bridge crane, bears enormous loads and mechanical impacts during frequent starting, braking, and reversing while driving the crane. Particularly vulnerable components such as rollers and brakes require regular replacement and maintenance.

[0003] The applicant's known wheelset assembly, traveling mechanism, and bridge crane (CN 217756556 U) relate to the field of lifting equipment technology. The wheelset assembly includes a wheelset bracket and a wheelset structure. The wheelset structure includes rollers and axles. The axles are mounted on the wheelset bracket, and two rollers are respectively fitted onto the axles and located on opposite sides of the wheelset bracket. Each roller includes a roller body and an inclined tread. The circumferential surface of the roller body is inclined from the side where the two rollers are close to each other to the side where they are far apart, forming the inclined tread. In this utility model, the traveling mechanism of the bridge crane continuously adjusts the position of the contact point with the rail through the inclined treads of the two rollers in the wheelset structure during travel, generating a serpentine wave-like motion. This avoids rail wear during travel, improving the safety and reliability of the bridge crane.

[0004] However, the above application has the following technical problems:

[0005] 1. During the turning process of the roller, the roller generates a rigid impact with the direction perpendicular to the track, which accelerates the wear of the roller and the track, and at the same time aggravates the vibration of the traveling mechanism when turning.

[0006] 2. When braking, the above device needs to brake each set of rollers separately to achieve a good braking effect. This braking method increases the pressure on the braking mechanism in the above device, which is not conducive to the long-term operation of the braking mechanism and accelerates the aging of the braking mechanism. Utility Model Content

[0007] The purpose of this utility model is to provide a trolley traveling mechanism that can reduce the impact of the roller annular groove sidewall on the traveling track when the trolley traveling mechanism moves along the curved traveling track, thereby extending the service life of the rollers and the traveling track, and reducing the vibration of the trolley traveling mechanism during travel.

[0008] The present invention adopts the following technical solution:

[0009] A trolley traveling mechanism includes a traveling frame and a horizontally positioned traveling track below the traveling frame. Pulley devices are installed at the four corners of the lower end face of the traveling frame and between the trolley and the corresponding traveling track. Each set of pulley devices is connected to the traveling frame at its upper end and to the traveling track at its lower end. Each pulley device includes hinged seats at the four corners of the lower end of the traveling frame. A horizontally positioned balance beam is hinged to the lower end of each hinged seat. Two sets of rollers are connected to both ends of each balance beam. Each set of rollers has a circumferential groove, and the upper part of the traveling track is adapted to the corresponding groove. Damping parts are provided on both the front and rear sides of the rollers to reduce the impact of the groove sidewalls on the traveling track when the rollers move along the curved traveling track. A drive mechanism is also provided on the outer side of each set of pulley devices to drive the corresponding rollers to rotate.

[0010] Furthermore, the lower part of the hinge seat is provided with a first receiving groove along the left-right horizontal direction, and a balance beam is provided in the first receiving groove. A first hinge shaft is provided between the front and rear side walls at the lower opening of the first receiving groove, and the front and rear ends of the first hinge shaft are respectively fixed to the front and rear side walls of the first receiving groove. The balance beam passes through the middle of the first hinge shaft and is rotatably connected to the balance beam. A set distance is provided between the top surface of the first receiving groove and the upper end surface of the balance beam. The lower part of the hinge seat is rotatably connected to the balance beam through the first hinge shaft.

[0011] Furthermore, the balance beam includes a cross brace located at the lower opening of the first receiving groove. Both ends of the cross brace have protrusions. The lower end face of each set of protrusions has a horizontally arranged second receiving groove. A second hinge shaft is provided between the front and rear side walls at the lower opening of the second receiving groove. A roller box passes through the middle of the second hinge shaft and is rotatably connected to the roller box. A set distance is provided between the top surface of the second receiving groove and the upper end face of the roller box. The protrusions of the cross brace are rotatably connected to the roller box through the second hinge shaft.

[0012] Furthermore, each set of roller boxes has a horizontal through groove on its lower end face, and two sets of parallel roller shafts are arranged between the front and rear side walls at the lower end opening of the horizontal through groove. A roller passes through the middle of each set of roller shafts and is rotatably connected to the roller.

[0013] Furthermore, the damping part includes a front damping spring disposed between the front end face of each set of roller boxes and the front side wall of the second receiving groove at the lower end of the corresponding cross brace. The front damping spring is coaxially disposed with the front part of the corresponding second hinge shaft, and the front and rear ends of the front damping spring are respectively fixed to the front side wall of the second receiving groove and the front end face of the corresponding roller box.

[0014] Furthermore, the damping part also includes a rear damping spring disposed between the rear end face of each set of roller boxes and the rear side wall of the second receiving groove at the lower end of the corresponding cross brace. The rear damping spring is coaxially disposed with the rear part of the corresponding second hinge shaft, and the front and rear ends of the rear damping spring are respectively fixed to the rear end face of the roller box and the rear side wall of the corresponding second receiving groove.

[0015] Furthermore, a double braking structure is provided between the two sets of rollers at the lower end of each set of balance beams. The double braking structure includes a braking part disposed between the two sets of rollers. The braking part has a left-right symmetrical structure, and a lifting part is provided at the upper part along the symmetrical center line of the braking part. The lifting part is used to drive the braking part to move up and down.

[0016] Furthermore, the braking part is made of friction material and is disc-shaped. The disc has a set diameter and its axis is forward-oriented, with the axis located below the roller shaft axis. The lifting part includes an eccentric shaft passing through the braking part at an eccentric position along its axial direction and rectangular through slots respectively opened in the middle of the front and rear side walls of the roller box. Each set of rectangular through slots is provided with a slider adapted to the rectangular through slot. An eccentric shaft is fixedly installed between the front and rear sets of sliders. The braking part passes through the middle of the eccentric shaft at an eccentric position along the axial direction of the braking part and is rotatably connected to the braking part. A vertical threaded hole is opened in the middle of the slider on the front side of the braking part. A screw is coaxially threaded in the threaded hole. The upper and lower ends of the screw are rotatably connected to the top and bottom walls of the front rectangular through slot, respectively. A vertical sliding through hole is opened in the middle of the slider on the rear side of the braking part. A sliding rod is coaxially slidably connected in the sliding through hole. The upper and lower ends of the screw are fixedly connected to the top and bottom walls of the rear rectangular through slot, respectively.

[0017] Furthermore, the diameter of the braking part is greater than the minimum distance between the corresponding left and right rollers, and the radius of the braking part is less than the minimum distance from the center of the braking part to the upper surface of the running track.

[0018] Furthermore, the drive mechanism includes a motor, with the fixed end of the motor fixedly mounted on the outer side of the upper surface of the corresponding roller box, and the output end of the motor connected to a gearbox. The input end of the gearbox is coaxially fixed to the output shaft of the motor, and the output end of the gearbox is coaxially fixed to the roller shaft.

[0019] This utility model achieves braking control of the trolley traveling mechanism by setting a drive mechanism, and at the same time uses a gearbox to amplify the torque at the output end of the motor, further improving the load capacity of the trolley traveling mechanism.

[0020] This utility model achieves simultaneous braking of two sets of rollers by setting a dual braking structure. Moreover, the dual braking structure only works under heavy load when one side of the roller has a rotational tendency, which greatly reduces the braking pressure of the dual braking structure and improves the overall safety of the trolley traveling mechanism.

[0021] This invention reduces the impact of the roller ring groove sidewall on the travel track when the trolley travel mechanism moves along the curved travel track by setting a damping part, thereby extending the service life of the roller and the travel track, and reducing the vibration of the trolley travel mechanism during travel. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the traveling frame in this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the running track in this utility model;

[0024] Figure 3 This is a schematic diagram of the gearbox structure in this utility model;

[0025] Figure 4 This is a schematic diagram of the drive gear in this utility model;

[0026] Figure 5 This is a schematic diagram of the hinge seat in this utility model;

[0027] Figure 6 This is a schematic diagram of the roller box in this utility model;

[0028] Figure 7 This is a schematic diagram of the damping spring in this utility model;

[0029] Figure 8 This is a schematic diagram of the slider structure in this utility model;

[0030] Figure 9 This is a schematic diagram of the braking part in this utility model.

[0031] In the diagram, 1. Traveling frame; 2. Traveling track; 3. Pulley device; 4. Hinge seat; 5. Balance beam; 6. Roller; 7. Annular groove; 8. Drive mechanism; 9. First receiving groove; 10. First hinge shaft; 11. Cross brace; 12. Second receiving groove; 13. Second hinge shaft; 14. Roller box; 15. Horizontal through groove; 16. Braking unit; 17. Screw; 18. Slider; 19. Shock-absorbing spring; 20. Motor; 21. Gearbox; 22. Roller shaft; 23. Driving gear; 24. Driven gear; 25. First input shaft; 26. Second input shaft; 27. Damping spring; 28. Slide rod. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0033] like Figures 1 to 9As shown, the trolley traveling mechanism of this utility model includes a traveling frame 1 and a horizontally arranged traveling track 2 below the traveling frame 1. Pulley devices 3 are installed between the four corners of the lower end face of the traveling frame 1 and the corresponding traveling track 2. The upper end of each set of pulley devices 3 is connected to the traveling frame 1, and the lower end is connected to the traveling track 2. Each pulley device 3 includes a hinge seat 4 located at the four corners of the lower end of the traveling frame 1. A horizontally arranged balance beam 5 is hinged to the lower end of each set of hinge seats 4. Two sets of rollers 6 are connected to both ends of each set of balance beams 5. Each set of rollers 6 has a circumferential groove. 7. The upper part of the running track 2 is adapted to the corresponding annular groove 7. When the running track 2 is arc-shaped, as the roller 6 moves along the arc of the running track 2, the front and rear end faces of the running track 2 press against the sidewall of the annular groove 7 of the corresponding roller 6. The reaction force of the sidewall of the annular groove 7 on the roller 6 forces the roller 6 to move forward or backward in the vertical direction of the running track 2. In order to reduce the impact of the roller 6 on the running track 2, damping parts are provided on both the front and rear sides of the roller 6. The damping parts are used to reduce the impact of the sidewall of the annular groove 7 on the running track 2 when the roller 6 moves on the arc-shaped running track 2. A drive mechanism 8 is also provided on the outside of each set of pulley devices 3. The drive mechanism 8 is used to drive the corresponding roller 6 to rotate.

[0034] During operation, the drive mechanism 8 is activated, and the four sets of drive mechanisms 8 located below the traveling frame 1 drive the corresponding drive mechanism 8. While the roller 6 rotates, it moves along the traveling track 2. The traveling frame 1 connected to the roller 6 moves along the traveling track 2 to adjust the working position.

[0035] In this utility model, a first receiving groove 9 is provided at the lower part of the hinge seat 4 along the left and right horizontal direction. A balance beam 5 is provided in the first receiving groove 9. A first hinge shaft 10 is provided between the front and rear side walls at the lower opening of the first receiving groove 9. The front and rear ends of the first hinge shaft 10 are respectively fixed to the front and rear side walls of the first receiving groove 9. The balance beam 5 passes through the middle of the first hinge shaft 10 and is rotatably connected to the balance beam 5. A set distance is provided between the top surface of the first receiving groove 9 and the upper end surface of the balance beam 5. The lower part of the hinge seat 4 is rotatably connected to the balance beam 5 through the first hinge shaft 10.

[0036] In this utility model, the balance beam 5 includes a cross brace 11 disposed at the lower opening of the first receiving groove 9. Both ends of the cross brace 11 are provided with protrusions. The lower end face of each set of protrusions is provided with a horizontally disposed second receiving groove 12. A second hinge shaft 13 is disposed between the front and rear side walls at the lower opening of the second receiving groove 12. A roller box 14 is passed through the middle of the second hinge shaft 13 and is rotatably connected to the roller box 14. A set distance is provided between the top surface of the second receiving groove 12 and the upper end face of the roller box 14. The protrusions of the cross brace 11 are rotatably connected to the roller box 14 through the second hinge shaft 13.

[0037] In this utility model, a horizontal through groove 15 is provided on the lower end face of each set of roller boxes 14. Two sets of parallel roller shafts 22 are provided between the front and rear side walls at the lower end opening of the horizontal through groove 15. A roller 6 passes through the middle of each set of roller shafts 22 and is rotatably connected to the roller 6.

[0038] When the trolley traveling mechanism turns, when the trolley traveling mechanism turns forward, the front end of each set of traveling rails 2 presses against the inner front wall of the corresponding roller 6; the roller box 14 connected to the roller 6 has a tendency to move forward. When the trolley traveling mechanism turns backward, the rear end of each set of traveling rails 2 presses against the inner rear wall of the corresponding roller 6; the roller box 14 connected to the roller 6 has a tendency to move backward and forward. In order to prevent the roller box 14 from moving back and forth and colliding with the protrusion of the cross brace 11;

[0039] In this embodiment, the damping part includes a front damping spring 27 disposed between the front end face of each set of roller boxes 14 and the front side wall of the second receiving groove 12 at the lower end of the corresponding cross brace 11. The front damping spring 27 is coaxially disposed with the front part of the corresponding second hinge shaft 13 and the front and rear ends of the front damping spring 27 are respectively fixed to the front side wall of the second receiving groove 12 and the front end face of the corresponding roller box 14.

[0040] The damping part also includes a rear damping spring 27 disposed between the rear end face of each set of roller boxes 14 and the rear side wall of the second receiving groove 12 at the lower end of the corresponding cross brace 11. The rear damping spring 27 is coaxially disposed with the rear part of the corresponding second hinge shaft 13 and the front and rear ends of the rear damping spring 27 are respectively fixed to the rear end face of the roller box 14 and the rear side wall of the corresponding second receiving groove 12.

[0041] When the drive mechanism 8 stops working, the traveling frame 1 is stationary. However, since the traveling frame 1 is usually quite tall and the lifting equipment is usually fixed at the top of the traveling frame 1, the center of gravity of the traveling frame 1 is high. When the center of gravity of the traveling frame 1 swings or shifts, it brings greater braking pressure to the roller 6. In order for the roller 6 to brake better.

[0042] In this utility model, a double braking structure is provided between the two sets of rollers 6 at the lower end of each set of balance beams 5. The double braking structure includes a braking part 16 disposed between the two sets of rollers 6. The braking part 16 has a left-right symmetrical structure. A lifting part is provided at the upper part of the symmetrical center line of the braking part 16. The lifting part is used to drive the braking part 16 to move up and down. By setting a single set of double braking structure, the two sets of rollers 6 are braked at the same time.

[0043] When the dual braking structure is working, in order to realize the interaction force between the two sets of rollers 6 at the lower end of each set of balance beams 5, the two sets of rollers 6 are used to achieve mutual braking between them. In this embodiment, the braking part 16 is made of friction material (e.g., ceramic) and the braking part 16 is disc-shaped. The disc has a set diameter and the disc axis is arranged forward and the axis is below the axis of the roller shaft 22. The lifting part includes an eccentric shaft passing through the braking part 16 at an eccentric position along the axial direction and rectangular through slots opened in the middle of the front and rear side walls of the roller box 14 respectively. Each set of rectangular through slots is provided with a slider 18 adapted to the rectangular through slot. An eccentric shaft is fixedly arranged between the front and rear sets of sliders 18. The braking part 16 passes through the middle of the eccentric shaft at an eccentric position along the axial direction of the braking part 16 and is rotatably connected to the braking part 16.

[0044] When the dual braking structure is working, that is, when the braking part 16 is in contact with and squeezed by both the left roller 6 and the right roller 6;

[0045] When the left roller 6 has a rolling tendency and moves to the left, the left roller 6 drives the brake part 16, and the brake part 16 has a tendency to rotate eccentrically, which increases the pressure and friction between the brake part 16 and the right roller 6; thereby restricting the rolling of the right roller 6.

[0046] When the left roller 6 has a rolling tendency and moves to the right, the left roller 6 drives the brake part 16, and the brake part 16 has a tendency to rotate eccentrically, which increases the pressure between the brake part 16 and the left roller 6 and increases the friction; thereby restricting the rolling of the left roller 6.

[0047] Similarly, when the right roller 6 has a rolling tendency and moves to the left, the right roller 6 drives the brake part 16, and the brake part 16 has a tendency to rotate eccentrically, which increases the pressure between the brake part 16 and the left roller 6 and increases the friction; thereby restricting the rolling of the left roller 6.

[0048] When the right roller 6 has a rolling tendency and moves to the right, the right roller 6 drives the brake part 16, and the brake part 16 has a tendency to rotate eccentrically, which increases the pressure between the brake part 16 and the right roller 6 and increases the friction; thereby restricting the rolling of the right roller 6.

[0049] The mutual braking between the left roller 6 and the right roller 6 improves braking efficiency;

[0050] In order to drive the brake unit 16 to simultaneously squeeze the left roller 6 and the right roller 6, in this embodiment, a vertical threaded hole is provided in the middle of the slider 18 located on the front side of the brake unit 16, and a screw 17 is coaxially threaded in the threaded hole. The upper and lower ends of the screw 17 are respectively rotatably connected to the top wall and bottom wall of the front rectangular through groove.

[0051] A vertical sliding through hole is provided in the middle of the slider 18 located on the rear side of the brake part 16. A slide rod 28 is slidably connected coaxially in the sliding through hole. The upper and lower ends of the screw 17 are respectively fixedly connected to the top wall and bottom wall of the rectangular through groove on the rear side.

[0052] In this embodiment, the diameter of the braking part 16 is greater than the minimum distance between the corresponding left and right rollers 6, and the radius of the braking part 16 is less than the minimum distance from the axis of the braking part 16 to the upper surface of the running track 2.

[0053] In order to prevent the threaded connection between the threaded hole of the slider 18 and the screw 17 in the lifting part from loosening, in this embodiment, a shock-absorbing spring 19 is provided on the upper end face of each group of sliders 18. The upper and lower ends of the shock-absorbing spring 19 are respectively fixed to the top wall of the corresponding rectangular through groove and the upper end face of the slider 18, and the shock-absorbing spring 19 is always in a compressed state.

[0054] In this utility model, the drive mechanism 8 includes a motor 20. The fixed end of the motor 20 is fixedly disposed on the outer side of the upper surface of the corresponding roller box 14. The output end of the motor 20 is connected to a gearbox 21. The input end of the gearbox 21 is coaxially fixed to the output shaft of the motor 20, and the output end of the gearbox 21 is coaxially fixed to the roller shaft 22.

[0055] In this embodiment, the gearbox 21 has a driving gear 23 and a driven gear 24 meshing with each other in its upper and lower parts. The driving gear 23 is coaxially fixed with a first input shaft 25, which passes through the front and rear side walls of the upper part of the gearbox 21, and both ends of the first input shaft 25 are rotatably connected to the front and rear side walls of the gearbox 21. The driven gear 24 is coaxially fixed with a second input shaft 26, which passes through the front and rear side walls of the lower part of the gearbox 21, and both ends of the second input shaft 26 are rotatably connected to the front and rear side walls of the gearbox 21. The rear ends of the first input shaft 25 and the second input shaft 26 are coaxially fixed with the output shaft of the motor 20 and the corresponding roller shaft 22, respectively.

Claims

1. A cart track, characterized by: Includes a traveling frame (1) and a horizontal traveling track (2) located below the traveling frame (1). Pulley devices (3) are installed between the four corners of the lower end face of the traveling frame (1) and the corresponding traveling track (2). The upper end of each pulley device (3) is connected to the traveling frame (1), and the lower end is connected to the traveling track (2). The pulley device (3) includes hinge seats (4) located at the four corners of the lower end of the traveling frame (1). Each hinge seat (4) has a horizontally mounted balance beam (5) hinged to its lower end. Each balance beam (5)... 5) Two sets of rollers (6) are connected to both the left and right ends. Each set of rollers (6) has a circumferential groove (7). The upper part of the running track (2) is adapted to the corresponding circumferential groove (7). Damping parts are provided on both the front and rear sides of the rollers (6). The damping parts are used to reduce the impact of the side wall of the circumferential groove (7) on the running track (2) when the rollers (6) move on the arc-shaped running track (2). A drive mechanism (8) is also provided on the outside of each set of pulley devices (3). The drive mechanism (8) is used to drive the corresponding rollers (6) to rotate.

2. The cart track of claim 1, wherein: The lower part of the hinge seat (4) is provided with a first receiving groove (9) in the horizontal direction. A balance beam (5) is provided in the first receiving groove (9). A first hinge shaft (10) is provided between the front and rear side walls at the lower opening of the first receiving groove (9). The front and rear ends of the first hinge shaft (10) are respectively fixed to the front and rear side walls of the first receiving groove (9). The balance beam (5) passes through the middle of the first hinge shaft (10) and is rotatably connected to the balance beam (5). A set distance is provided between the top surface of the first receiving groove (9) and the upper end surface of the balance beam (5). The lower part of the hinge seat (4) is rotatably connected to the balance beam (5) through the first hinge shaft (10).

3. The cart track of claim 2, wherein: The balance beam (5) includes a cross brace (11) set at the lower opening of the first receiving groove (9). Both ends of the cross brace (11) are provided with protrusions. The lower end face of each set of protrusions is provided with a horizontally arranged second receiving groove (12). A second hinge shaft (13) is provided between the front and rear side walls at the lower opening of the second receiving groove (12). A roller box (14) is passed through the middle of the second hinge shaft (13) and is rotatably connected to the roller box (14). A set distance is provided between the top surface of the second receiving groove (12) and the upper end face of the roller box (14). The protrusion of the cross brace (11) is rotatably connected to the roller box (14) through the second hinge shaft (13).

4. The cart track of claim 3, wherein: Each set of roller boxes (14) has a horizontal through groove (15) on its lower end face. Two sets of parallel roller shafts (22) are set between the front and rear side walls at the lower end opening of the horizontal through groove (15). A roller (6) is inserted through the middle of each set of roller shafts (22) and is rotatably connected to the roller (6).

5. The gantry of claim 1, wherein: The damping part includes a front damping spring (27) provided between the front end face of each set of roller boxes (14) and the front side wall of the second receiving groove (12) at the lower end of the corresponding cross brace (11). The front damping spring (27) is coaxially provided with the front part of the corresponding second hinge shaft (13), and the front and rear ends of the front damping spring (27) are respectively fixed to the front side wall of the second receiving groove (12) and the front end face of the corresponding roller box (14).

6. The cart track of claim 5, wherein: The damping part also includes a rear damping spring (27) disposed between the rear end face of each set of roller boxes (14) and the rear side wall of the second receiving groove (12) at the lower end of the corresponding cross brace (11). The rear damping spring (27) is coaxially disposed with the rear part of the corresponding second hinge shaft (13), and the rear ends of the rear damping spring (27) are respectively fixed to the rear end face of the roller box (14) and the rear side wall of the corresponding second receiving groove (12).

7. The cart track of claim 3, wherein: A double braking structure is provided between the two sets of rollers (6) at the lower end of each set of balance beams (5). The double braking structure includes a braking part (16) provided between the two sets of rollers (6). The braking part (16) has a left-right symmetrical structure. A lifting part is provided at the upper part of the symmetrical center line of the braking part (16). The lifting part is used to drive the braking part (16) to move up and down.

8. The cart track of claim 7, wherein: The braking part (16) is made of friction material and is disc-shaped. The disc has a set diameter and its axis is forward-facing and located below the axis of the roller shaft (22). The lifting part includes an eccentric shaft passing through the braking part (16) at an eccentric position along the axial direction and rectangular through slots opened at the middle of the front and rear side walls of the roller box (14). Each set of rectangular through slots is provided with a slider (18) that matches the rectangular through slot. An eccentric shaft is fixedly provided between the front and rear sets of sliders (18). The middle of the eccentric shaft is eccentrically positioned along the axial direction of the braking part (16). A braking part (16) is inserted through the device and is rotatably connected to the braking part (16). A vertical threaded hole is opened in the middle of the slider (18) on the front side of the braking part (16). A screw (17) is coaxially threaded in the threaded hole. The upper and lower ends of the screw (17) are rotatably connected to the top and bottom walls of the front rectangular through groove, respectively. A vertical sliding through hole is opened in the middle of the slider (18) on the rear side of the braking part (16). A sliding rod (28) is coaxially slidably connected in the sliding through hole. The upper and lower ends of the screw (17) are fixedly connected to the top and bottom walls of the rear rectangular through groove, respectively.

9. The cart track of claim 8, wherein: The diameter of the braking part (16) is greater than the minimum distance between the corresponding left and right rollers (6), and the radius of the braking part (16) is less than the minimum distance from the center of the braking part (16) to the upper surface of the running track (2).

10. The cart track of claim 9, wherein: The drive mechanism (8) includes a motor (20), the fixed end of the motor (20) is fixedly disposed on the outer side of the upper surface of the corresponding roller box (14), the output end of the motor (20) is connected to a gearbox (21), the input end of the gearbox (21) is coaxially fixed to the output shaft of the motor (20), and the output end of the gearbox (21) is coaxially fixed to the roller shaft (22).

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