A multifunctional treadmill

Abstract

The present invention discloses a multifunctional treadmill, comprising a mounting base, a runway structure, a transmission component, a counterweight component, and a leg trainer. The mounting base comprises a bottom plate and side panels, with the side panels fixedly connected to both sides of the bottom plate. The runway structure is disposed between the side panels. One end of the mounting base is fixedly connected to a front frame, and one end of the runway structure is provided with a counterweight component. The counterweight component and its relative connection with the runway structure are both slidably connected within the front frame. A leg trainer is disposed on one side of the front frame. A transmission component is disposed between the bottom plate and the runway structure, and one end of the transmission component is in transmission connection with the leg trainer. The present invention aims to provide a multifunctional treadmill that can achieve runway angle adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of exercise equipment, in particular to a multifunctional treadmill. Background Art

[0002] Treadmills are common fitness equipment in homes and gyms. They are the simplest type of home fitness equipment today and the best choice for home fitness equipment. With the improvement of material living standards, people are also looking for a variety of fitness methods when exercising. However, some traditional treadmills on the market have relatively single fitness functions and lack other sports and fitness functions, which are difficult to meet people's growing fitness needs. In response to this, we have designed a multifunctional treadmill that can achieve running exercises and knee bending exercises. The inclination angle of the runway structure can be adjusted through knee bending exercises to meet specific running exercise needs. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide a multifunctional treadmill capable of adjusting the runway angle.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a multifunctional treadmill, including an installation base, a runway structure, a transmission component, a counterweight component, and a leg trainer, the installation base including a bottom plate and side plates, the side plates being fixedly connected to the bottom plate on both sides, a runway structure being arranged between the side plates, and the runway structure being used for running exercise, one end of the installation base is fixedly connected to a front vertical frame, the front vertical frame being used to limit the movement of the counterweight component, one end of the runway structure being provided with a counterweight component, and the counterweight component being used to adjust the movement force of the leg trainer, the counterweight component and the relative connection with the runway structure are both slidably connected in the front vertical frame, a leg trainer is arranged on one side of the front vertical frame, and the leg trainer is used for leg flexion and extension exercise, a transmission component is arranged between the bottom plate and the runway structure, the transmission component is used to link the transmission between the runway structure, one end of the counterweight component and the leg trainer, and one end of the transmission component is transmission-connected to the leg trainer.

[0005] In some embodiments, sliding grooves are respectively provided on opposite sides of the side panels, and rollers are rotatably connected to both sides of the end portions of the runway structure, and the rollers are respectively rollingly connected in the sliding grooves.

[0006] In some embodiments, the front frame includes side panels, a back panel, a top panel, and a control panel. The side panels are respectively fixedly connected to one end of the side panels, and a sliding guide groove is provided on the opposite side of the side panels. The counterweight components are slidably connected in the sliding guide groove. The back panel is fixedly connected between one side of the side panels, and the leg trainer is fixedly connected to one side of the back panel. The upper ends of the two side panels are fixedly connected to the top panel, and the top panel is inclined toward the side of the runway structure. The control panel is fixedly connected to the top panel.

[0007] In some embodiments, a runway handrail is fixedly connected between the side vertical panels and the side edge panels.

[0008] In some embodiments, the counterweight component includes a hinge, a weighing plate, a connecting piece, a sliding guide block, a side baffle, a counterweight plate, a sliding guide column, and a fastening nut. Two groups of hinge grooves are respectively provided on one edge of the runway structure, and hinges are rotatably connected in the hinge grooves. One end of the hinge is fixedly connected to the weighing plate, and the two sides of the lower end of the weighing plate are fixedly connected to the connecting piece. One side of the connecting piece is rotatably connected to the runway structure, and the connecting piece is slidably connected in the sliding guide groove. The two sides of the upper end of the weighing plate are respectively fixedly connected to the side baffles, and the outer sides of the side baffles are respectively fixedly connected to the sliding guide blocks, and the sliding guide blocks are slidably connected in the sliding guide grooves. Several counterweight plates are stacked on the weighing plate between the side baffles, and two groups of through holes are provided on the counterweight plate, and sliding guide columns are inserted into the through holes. The lower end of the sliding guide column is fixedly connected to the weighing plate, and the upper end of the sliding guide column is threadedly connected to the fastening nut.

[0009] In some embodiments, the transmission components include a linkage shaft, a transmission gear, a transmission sprocket, a synchronous chain belt, a sliding rail, a sliding block, a support arm, a tensioning spring, a fixed block, and a transmission rod. A linkage shaft is rotatably connected between the two side plates close to the front frame. A transmission gear is fixedly connected to the middle of the linkage shaft. A transmission rod is slidably connected to the bottom plate opposite to the transmission gear. A plurality of gear teeth are provided on the upper end of the transmission rod. The transmission gear is meshed with the gear teeth. Symmetrical transmission sprockets are fixedly connected to the linkage shafts on both sides of the transmission gear. The transmission sprocket is connected to a synchronous chain belt, one end of the synchronous chain belt is fixedly connected to a tensioning spring, the other end of the tensioning spring is fixedly connected to a fixed block, the fixed block is fixedly connected to the bottom of the lower end of the runway structure, the other end of the synchronous chain belt is fixedly connected to a sliding block, the sliding block is slidably connected to a sliding rail, the sliding rail is fixedly connected to the base plate, one side of the sliding block is rotatably connected to a support arm, the other end of the support arm is hingedly connected to the bottom surface of the lower end of the runway structure, and one end of the transmission rod passes through the front frame and is transmission-connected to the leg trainer.

[0010] In some embodiments, the upper end of the base plate is fixedly connected to a limiting block, the limiting block is penetrated by a sliding sleeve hole, and the transmission rod sliding sleeve is connected in the sliding sleeve hole.

[0011] In some embodiments, the leg trainer includes a seat, a guide rail, a footrest structure, a strap, and a locking device. One side of the back panel is fixedly connected to the seat, one end of the seat is fixedly connected to the guide rail, the upper end of the guide rail is slidably connected to the footrest structure, the footrest structure is provided with a footrest surface facing the seat side, and symmetrical straps are fixedly connected to the footrest surface. One end of the transmission rod passes through the front frame and the rear of the seat in sequence and is fixedly connected to the lower end of the footrest structure. A locking device is provided between the seat and the transmission rod.

[0012] In some embodiments, the locking device includes a lock body, a locking screw, a locking block, and a handwheel. One end of the lock body is fixedly connected to one side of the seat, and one end of the transmission rod passes through the seat and is connected to the lock body. A screw hole is provided at the upper end of the lock body, and a movable groove is provided at the lower end of the screw hole. A locking block is slidably connected in the movable groove. Several locking grooves are provided on the transmission rod opposite to the locking block. The upper end of the locking block is rotatably connected to a locking screw, and the locking screw is threadedly connected in the screw hole. The upper end of the locking screw passes through the screw hole and is fixedly connected to the handwheel.

[0013] The beneficial effects of the present invention are as follows: a leg trainer is provided on one side of the front stand of the device, which adds a knee flexion exercise function. At the same time, the leg trainer is linked with the runway structure through a transmission component, which can realize the inclination adjustment of the runway structure and meet the function of running angle adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the A1 part;

[0016] Figure 3 Schematic diagram of the connection structure between the runway structure and the counterweight component of the present invention;

[0017] Figure 4 This is a schematic diagram of the connection structure of the leg training device of the present invention;

[0018] Figure 5 Schematic diagram of the cross-sectional structure of the locking device of the present invention;

[0019] Figure 6 It is a schematic diagram of the connection structure of the transmission components of the present invention.

[0020] In the figure: 1 runway structure, 2 bottom plate, 3 side plate, 4 sliding groove, 5 roller, 6 side vertical plate, 7 back plate, 8 top plate, 9 control panel, 10 runway handrail, 11 hinge, 12 weighing plate, 13 connecting part, 14 sliding guide block, 15 side baffle, 16 counterweight plate, 17 sliding guide column, 18 fastening nut, 19 linkage shaft, 20 transmission gear, 21 transmission sprocket, 22 synchronous chain belt, 23 sliding rail, 24 sliding block, 25 support arm, 26 tensioning spring, 27 fixing block, 28 transmission rod, 29 limit block, 30 seat, 31 guide rail, 32 footrest structure, 33 strap, 34 locking device, 35 lock body, 36 locking screw, 37 locking block, 38 handwheel, 39 guide groove. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-6 A multifunctional treadmill includes an installation base, a runway structure 1, a transmission component, a counterweight component, and a leg trainer. The installation base includes a bottom plate 2 and side plates 3. The bottom plate 2 is fixedly connected to the side plates 3 on both sides, and a runway structure 1 is arranged between the side plates 3. The runway structure 1 is used for running exercise. One end of the installation base is fixedly connected to a front vertical frame, and the front vertical frame is used to limit the movement of the counterweight component. A counterweight component is arranged at one end of the runway structure 1, and the counterweight component is used to adjust the movement strength of the leg trainer. The counterweight component and the relative connection with the runway structure 1 are slidably connected in the front vertical frame. A leg trainer is arranged on one side of the front vertical frame, and the leg trainer is used for leg flexion and extension exercises. A transmission component is arranged between the bottom plate 2 and the runway structure 1, and the transmission component is used to link the runway structure 1, one end of the counterweight component and the leg trainer. One end of the transmission component is transmission connected to the leg trainer.

[0023] In some embodiments, a sliding groove 4 is respectively opened on the opposite side of the side panel 3, and rollers 5 are rotatably connected to both sides of the end of the runway structure 1, and the rollers 5 are respectively rollingly connected in the sliding groove 4; the front frame includes a side panel 6, a back panel 7, a top panel 8, and a control panel 9, and the side panels 6 are respectively fixedly connected to one end of the side panel 3, and a sliding guide groove 39 is respectively opened on the opposite side of the side panel 6, and the counterweight component is slidably connected in the sliding guide groove 39, and the back panel 7 is fixedly connected between one side of the side panel 6, and the leg trainer is fixedly connected to one side of the back panel 7, and the upper ends of the panels 6 on both sides are fixedly connected to the top panel. 8, the top plate 8 is tilted toward one side of the runway structure 1, and a control panel 9 is fixedly connected to the top plate 8; the counterweight component includes a hinge 11, a weighing plate 12, a connector 13, a sliding guide block 14, a side baffle 15, a counterweight plate 16, a sliding guide column 17, and a fastening nut 18. Two sets of hinge grooves are respectively opened on the edge of one side of the runway structure 1, and the hinge grooves are respectively rotatably connected with the hinge 11, one end of the hinge 11 is fixedly connected to the weighing plate 12, and the two sides of the lower end of the weighing plate 12 are fixedly connected to the connector 13, one side of the connector 13 is rotatably connected to the runway structure 1, and the connector 13 is slidably connected to the runway structure 1. In the guide groove 39, the upper ends of the weighing plates 12 are fixedly connected to the side baffles 15 on both sides, and the outer sides of the side baffles 15 are fixedly connected to the guide blocks 14. The guide blocks 14 are slidably connected in the guide groove 39. A plurality of counterweight plates 16 are stacked on the weighing plates 12 between the side baffles 15. The counterweight plates 16 are provided with two groups of through holes, and the through holes are connected with guide posts 17. The lower ends of the guide posts 17 are fixedly connected to the weighing plates 12, and the upper ends of the guide posts 17 are threadedly connected with fastening nuts 18. When in use, the transmission components in the structure of the device can drive one end of the runway structure 1 to flip and tilt upward. At this time, the other end of the runway structure 1 drives the roller 5 to slide relatively along the sliding groove 4, and the upward-turned running structure also drives the counterweight structure to move upward. The upper end of the weighing plate 12 in the counterweight structure is used to place the counterweight plate 16. The exercise intensity of the leg trainer can be adjusted by the number of counterweight plates 16 placed (the specific principle will be explained later in this description). The side baffle 15 and the sliding guide column 17 can relatively limit the position of the counterweight plate 16, and the fastening nut 18 at the upper end of the sliding guide column 17 can relatively fix the counterweight plate 16 to prevent the counterweight plate 16 from jumping during training.

[0024] In some embodiments, a runway handrail 10 is fixedly connected between the side upright plate 6 and the side edge plate 3 , and the runway handrail 10 can play a supporting role when doing running training on the runway structure 1 .

[0025] In some embodiments, the transmission components include a linkage shaft 19, a transmission gear 20, a transmission sprocket 21, a synchronous chain belt 22, a sliding rail 23, a sliding block 24, a support arm 25, a tensioning spring 26, a fixing block 27, and a transmission rod 28. The linkage shaft 19 is rotatably connected between the two side plates 3 near the front frame, the middle of the linkage shaft 19 is fixedly connected to the transmission gear 20, and the transmission rod 28 is slidably connected to the bottom plate 2 opposite to the transmission gear 20. The upper end of the bottom plate 2 is fixedly connected to a limiting block 29, and a sliding sleeve hole is passed through the limiting block 29. One end of the transmission rod 28 is slidingly connected to the sliding sleeve hole. The transmission direction of the transmission rod 28 can be relatively restricted by the limiting block 29. A plurality of gear grooves are provided on the upper end of the transmission rod 28. 0 is meshed with the gear groove, and the linkage shafts 19 on both sides of the transmission gear 20 are respectively fixedly connected with relatively symmetrical transmission sprockets 21, and the transmission sprocket 21 is transmission-connected with a synchronous chain belt 22, one end of the synchronous chain belt 22 is fixedly connected with a tensioning spring 26, and the other end of the tensioning spring 26 is fixedly connected with a fixed block 27, and the fixed block 27 is fixedly connected to the bottom of the lower end of the runway structure 1, and the other end of the synchronous chain belt 22 is fixedly connected with a sliding block 24, and the sliding block 24 is slidably connected to the sliding rail 23, and the sliding rail 23 is fixedly connected to the base plate 2, and one side of the sliding block 24 is rotatably connected to a support arm 25, and the other end of the support arm 25 is hingedly connected to the bottom surface of the lower end of the runway structure 1, and one end of the transmission rod 28 passes through the front frame and is transmission-connected to the leg trainer;The leg trainer includes a seat 30, a guide rail 31, a footrest structure 32, a strap 33, and a locking device 34. One side of the backboard 7 is fixedly connected to the seat 30, one end of the seat 30 is fixedly connected to the guide rail 31, the upper end of the guide rail 31 is slidably connected to the footrest structure 32, the footrest structure 32 is provided with a footrest surface facing the side of the seat 30, and a symmetrical strap 33 is fixedly connected to the footrest surface. One end of the transmission rod 28 passes through the front frame and the seat 30 in sequence and is fixedly connected to the lower end of the footrest structure 32. A locking device 34 is provided between the seat 30 and the transmission rod 28. Specifically, when in use, the user You can sit on the seat 30, then bend your knees, place your feet on the footrest surface of the footrest structure 32, and fix your feet with the straps 33. During training, stretch your legs outward, and use the power of your legs to drive the footrest structure 32 to move outward, and the footrest structure 32 drives the transmission rod 28 to move outward, and the gear groove at the upper end of the transmission rod 28 drives the transmission gear 20 to rotate, and the transmission gear 20 drives the linkage shaft 19 to rotate, and the linkage shaft 19 drives the transmission sprockets 21 at both ends to rotate, and the transmission sprocket 21 drives the sliding block 24 to slide and move through the synchronous chain belt 22, and the tension at the other end of the synchronous chain belt 22 is The tightening spring 26 can make the synchronous chain belt 22 always mesh with the transmission sprocket 21. During the movement of the sliding block 24, the support arm 25 is driven to flip and move. The other end of the support arm 25 lifts up one end of the runway structure 1, causing the runway structure 1 to flip and tilt. At this time, the position of the transmission rod 28 is relatively fixed by the locking device 34, so that the runway structure 1 can be kept in an inclined state to meet the adjustment of the runway inclination angle during running training. When the locking device 34 is in the released state, since the counterweight structure is set at one end of the runway structure 1, the counterweight structure presses the runway structure downward under the action of gravity. The top end of the track structure 1 flips over, restoring the track structure 1 to its initial horizontal state. During the restoration process, the track structure 1 pushes the sliding block 24 back to its original position via the support arm 25. The sliding block 24 pulls the synchronous chain belt 22, which drives the transmission sprocket 21 to rotate. The transmission sprocket 21 drives the linkage shaft 19 to rotate, which drives the transmission gear 20 to rotate. The transmission gear 20 drives the transmission rod 28 to retract inward. The other end of the transmission rod 28 drives the footrest structure 32 to move forward. At this time, the user slowly bends their knees. Repeating this process allows the user to continuously perform knee bending exercises.

[0026] In some embodiments, the locking device 34 includes a lock body 35, a locking screw 36, a locking block 37, and a handwheel 38. One end of the lock body 35 is fixedly connected to one side of the seat 30, and one end of the transmission rod 28 passes through the seat 30 and is connected to the lock body 35. A screw hole is provided at the upper end of the lock body 35, and a movable groove is provided at the lower end of the screw hole. A locking block 37 is slidably connected in the movable groove. A plurality of locking grooves are provided on the transmission rod 28 opposite to the locking block 37. The upper end of the locking block 37 is rotatably connected to the locking screw 36, and the locking screw 36 is threadedly connected in the screw hole. The upper end of the locking screw 36 passes through the screw hole. After coming out of the screw hole, it is fixedly connected to the handwheel 38. When you need to run and exercise on the runway structure 1, first sit on the seat 30, put your feet on the footrest structure 32, stretch your legs, and tilt the runway structure 1 to a certain angle. Then turn the handwheel 38, and the handwheel 38 drives the locking screw 36 to rotate. The locking screw 36 moves downward under the action of the thread, and the lower end of the locking screw 36 drives the locking block 37 to move downward. The locking block 37 engages with the locking groove downward, thereby relatively fixing the transmission rod 28, so that the runway structure 1 remains in an inclined state, and finally you can run on the runway structure 1.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A multifunctional treadmill comprising a mounting base, a track structure (1), a transmission component, a counterweight component, and a leg trainer, characterized in that: The mounting base comprises a bottom plate (2) and side plates (3), the bottom plate (2) is fixedly connected to the side plates (3) on both sides, a runway structure (1) is provided between the side plates (3), one end of the mounting base is fixedly connected to the front frame, one end of the runway structure (1) is provided with a counterweight component, the counterweight component and the relative connection with the runway structure (1) are slidably connected in the front frame, a leg trainer is provided on one side of the front frame, a transmission component is provided between the bottom plate (2) and the runway structure (1), and one end of the transmission component is transmission-connected to the leg trainer; The transmission components include a linkage shaft (19), a transmission gear (20), a transmission sprocket (21), a synchronous chain belt (22), a sliding rail (23), a sliding block (24), a support arm (25), a tensioning spring (26), a fixing block (27), and a transmission rod (28). A linkage shaft (19) is rotatably connected between the two side plates (3) close to the front stand. A transmission gear (20) is fixedly connected to the middle of the linkage shaft (19). A transmission rod (28) is slidably connected to the bottom plate (2) opposite to the transmission gear (20). A plurality of gear teeth are provided on the upper end of the transmission rod (28). The transmission gear (20) is meshed with the gear teeth. A symmetrical transmission sprocket (21) is fixedly connected to the linkage shaft (19) on both sides of the transmission gear (20). ), the transmission sprocket (21) is connected to a synchronous chain belt (22), one end of the synchronous chain belt (22) is fixedly connected to a tensioning spring (26), the other end of the tensioning spring (26) is fixedly connected to a fixed block (27), the fixed block (27) is fixedly connected to the bottom of the lower end of the runway structure (1), the other end of the synchronous chain belt (22) is fixedly connected to a sliding block (24), the sliding block (24) is slidably connected to a sliding rail (23), the sliding rail (23) is fixedly connected to the base plate (2), one side of the sliding block (24) is rotatably connected to a support arm (25), the other end of the support arm (25) is hingedly connected to the bottom surface of the lower end of the runway structure (1), and one end of the transmission rod (28) passes through the front stand and is transmission-connected to the leg trainer.

2. A multifunctional treadmill according to claim 1, characterized in that: Sliding grooves (4) are respectively provided on opposite sides of the side panels (3), and rollers (5) are rotatably connected to both sides of the end of the runway structure (1), and the rollers (5) are respectively rollingly connected in the sliding grooves (4).

3. The multifunctional treadmill according to claim 1, characterized in that: The front stand comprises side panels (6), a back panel (7), a top panel (8), and a control panel (9); the side panels (6) are respectively fixedly connected to one end of the side panels (3); a sliding guide groove (39) is respectively provided on the opposite side of the side panels (6); the counterweight component is slidably connected in the sliding guide groove (39); the back panel (7) is fixedly connected between one side of the side panels (6); the leg trainer is fixedly connected to one side of the back panel (7); the upper ends of the two side panels (6) are fixedly connected to the top panel (8); and the control panel (9) is fixedly connected to the top panel (8).

4. The multifunctional treadmill according to claim 3, characterized in that: A runway handrail (10) is fixedly connected between the side vertical plate (6) and the side edge plate (3).

5. The multifunctional treadmill according to claim 1, characterized in that: The counterweight component comprises a hinge (11), a weighing plate (12), a connecting member (13), a sliding guide block (14), a side baffle (15), a counterweight plate (16), a sliding guide column (17), and a fastening nut (18). Two sets of hinge grooves are respectively provided on one side edge of the runway structure (1), and hinges (11) are rotatably connected in the hinge grooves. One end of the hinge (11) is fixedly connected to the weighing plate (12), and both sides of the lower end of the weighing plate (12) are fixedly connected to connecting members (13). One side of the connecting member (13) is rotatably connected to the runway structure (1), and the connecting member (13) is slidably connected to the runway structure (1). In the sliding guide groove (39), the upper ends of the weighing plate (12) are fixedly connected with side baffles (15) on both sides, and the outer sides of the side baffles (15) are fixedly connected with sliding guide blocks (14). The sliding guide blocks (14) are slidably connected in the sliding guide groove (39). A plurality of counterweight plates (16) are stacked on the weighing plate (12) between the side baffles (15). The counterweight plates (16) are provided with two groups of through holes. The through holes are connected with sliding guide columns (17). The lower ends of the sliding guide columns (17) are fixedly connected to the weighing plate (12). The upper ends of the sliding guide columns (17) are threadedly connected with fastening nuts (18).

6. The multifunctional treadmill according to claim 1, characterized in that: The upper end of the bottom plate (2) is fixedly connected to a limit block (29), a sliding hole is passed through the limit block (29), and the transmission rod (28) is slidingly connected in the sliding hole.

7. The multifunctional treadmill according to claim 4, characterized in that: The leg trainer comprises a seat (30), a guide rail (31), a footrest structure (32), a strap (33), and a locking device (34). One side of the backboard (7) is fixedly connected to the seat (30), one end of the seat (30) is fixedly connected to the guide rail (31), the upper end of the guide rail (31) is slidably connected to the footrest structure (32), the footrest structure (32) is provided with a footrest surface facing the side of the seat (30), and symmetrical straps (33) are fixedly connected to the footrest surface. One end of the transmission rod (28) passes through the front frame and the seat (30) in sequence and is fixedly connected to the lower end of the footrest structure (32). A locking device (34) is provided between the seat (30) and the transmission rod (28).

8. The multifunctional treadmill according to claim 7, characterized in that: The locking device (34) comprises a lock body (35), a locking screw (36), a locking block (37), and a hand wheel (38). One end of the lock body (35) is fixedly connected to one side of the seat (30). One end of the transmission rod (28) passes through the seat (30) and is connected to the lock body (35). A screw hole is provided at the upper end of the lock body (35). A movable groove is provided at the lower end of the screw hole. A locking block (37) is slidably connected in the movable groove. A plurality of locking grooves are provided on the transmission rod (28) opposite to the locking block (37). The upper end of the locking block (37) is rotatably connected to the locking screw (36). The locking screw (36) is threadedly connected in the screw hole. The upper end of the locking screw (36) passes through the screw hole and is fixedly connected to the hand wheel (38).

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