Supporting device and AGV with same

Abstract

The utility model provides a supporting device and an AGV with the supporting device, the supporting device comprises a supporting bedplate, a first supporting seat and a sliding assembly, the supporting bedplate, the sliding assembly and the first supporting seat are connected in sequence, and the sliding assembly extends in the length direction of the supporting bedplate; the number of the first supporting seats is at least two, and the two first supporting seats are slidably connected with the supporting platen through the sliding assemblies. The two first supporting seats can get close to each other or get away from each other when sliding. According to the supporting device provided by the utility model, the sliding assembly is arranged on the supporting bedplate, so that a worker can conveniently and quickly adjust the supporting position, and compared with the prior art that the supporting seat needs to be detached to readjust the supporting position when different types of workpieces are met, the supporting position can be adjusted by adopting a sliding connection mode between the first supporting seat and the supporting bedplate; and when different workpiece types are faced, the first supporting base does not need to be disassembled repeatedly, and the assembling efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of AGV vehicles, in particular to a support device and an AGV vehicle with the same. Background Art

[0002] AGV (Automated Guided Vehicle, also known as an automated guided transport vehicle) refers to a transport vehicle equipped with an automatic guidance device such as electromagnetic or optical. It can travel along a specified guidance path and has safety protection and various transfer functions. AGV is currently widely used in related industries such as warehousing, manufacturing, and logistics transportation. Its efficient and convenient characteristics have improved the degree of production automation and the working efficiency of related operations.

[0003] In the assembly lines of some large workpieces, due to different vehicle models, the workpieces are naturally different, so the support conditions for the workpieces during the assembly process are different. Most of the previous AGV vehicles use fixed support devices. For example Figure 1 As shown, the adjustment method of the support device of the AGV vehicle in the prior art for the support seat is very single. The support seat is connected to the bottom plate through adjustment holes. When the vehicle model is different and the position of the support seat needs to be adjusted, only the fixing bolts in the adjustment holes can be manually screwed out, and then the support seat is removed from the bottom plate. After determining the installation position, bolts are reinserted to fix the support seat. This operation method is not conducive to improving the assembly efficiency of the assembly line on the one hand, and on the other hand, the adjustment method is too single, and the distance between the left and right support seats is always subject to certain adjustment limitations, and it cannot better meet the needs of different workpieces. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a support device with a more convenient adjustment method and higher assembly efficiency, and an AGV vehicle with the same.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a support device, including a support platform plate, a first support seat, and a sliding component. The support platform plate, the sliding component, and the first support seat are sequentially connected. The sliding component extends along the length direction of the support platform plate; there are at least two first support seats, and both of the two first support seats are slidably connected to the support platform plate through the sliding component; when the two first support seats slide, they can approach or move away from each other.

[0006] Preferably, the first support base includes a base and a seat body. The seat body is hinged to the base, and the bottom of the base is connected to the sliding assembly. The support device further includes a first driving member, and the output end of the first driving member is connected to the seat body. The first driving member can drive the seat body to swing relative to the base.

[0007] Preferably, hinge seats are respectively arranged on both sides of the base. One end of each hinge seat is connected to the base, and the other end protrudes upward relative to the base. A hinge hole is formed in the hinge seat and penetrates along the thickness direction of the hinge seat. Hinge shafts are respectively arranged on both sides of the seat body. One end of each hinge shaft is connected to the seat body, and the other end extends outward relative to the seat body. The hinge shaft can extend into the hinge hole.

[0008] Preferably, the sliding assembly includes a sliding rail and a slider connected to each other. The sliding rail extends along the length direction of the support platen. The first support base includes a base and a seat body arranged on the base. The base can be slidably connected to the sliding rail through the slider. An adjusting assembly is arranged on the support platen. The adjusting assembly can lock or loosen the base. When the adjusting assembly locks the base, the base is fixed to the support platen. When the adjusting assembly loosens the base, the base can reciprocate relative to the support platen.

[0009] Preferably, the adjusting assembly includes a lock seat and a plug pin. The lock seats are arranged at intervals on both sides of the sliding rail. One end of each lock seat is fixed to the support platen, and the other end extends upward relative to the support platen. An adjusting hole is formed in the lock seat and extends along the thickness direction of the lock seat. Lock holes are formed on both sides of the base and penetrate along the thickness direction of the base. One end of the plug pin can pass through the lock hole and be inserted into the adjusting hole to fix the base to the support platen.

[0010] Preferably, there are a plurality of adjusting holes, and the plurality of adjusting holes are arranged at intervals along the length direction of the lock seat.

[0011] Preferably, connecting plates are arranged on both sides of the support platen. One end of each connecting plate is connected to the support platen, and the other end extends outward relative to the support platen. A second support base is arranged on the connecting plate, and the second support base is arranged at an interval from the first support base.

[0012] An AGV vehicle includes a vehicle body and a lifting device, and further includes the supporting device described in any one of the above preferred embodiments; both the lifting device and the supporting device are arranged inside the vehicle body. The lifting device includes a fixing plate and a jacking mechanism arranged on the fixing plate. The jacking mechanism is located between the fixing plate and the supporting platform plate, and the jacking mechanism can drive the supporting device to perform lifting motion.

[0013] Preferably, the jacking mechanism includes a second driving member and a scissor arm connected to each other. The scissor arm is connected to the supporting platform plate. The second driving member can drive the scissor arm to extend or contract; when the scissor arm extends, it can drive the supporting platform plate to rise, and when the scissor arm contracts, it can drive the supporting platform plate to descend.

[0014] Preferably, the scissor arm includes a first connecting rod and a second connecting rod which are movably connected. Both the first connecting rod and the second connecting rod include a fixed end and a movable end. The fixed end and the movable end of the first connecting rod are respectively connected to the supporting platform plate and the fixing plate, and the fixed end and the movable end of the second connecting rod are respectively connected to the fixing plate and the supporting platform plate; guiding grooves are arranged at the top of the fixing plate and the bottom of the supporting platform plate, and movable wheels are respectively arranged at the movable ends of the first connecting rod and the second connecting rod. The second driving member is connected to the movable end of the first connecting rod. When the second driving member drives the movable end of the first connecting rod to move, the movable wheels can slide along the guiding grooves.

[0015] The beneficial effects of the present utility model are mainly reflected in:

[0016] 1. For the supporting device provided by the present utility model and the AGV vehicle having the same, by arranging a sliding assembly on the supporting platform plate, it is convenient for workers to quickly adjust the supporting position of the first supporting seat. Compared with the previous situation where the supporting seat needs to be disassembled and the supporting position needs to be readjusted when encountering different workpiece types, in this embodiment, by adopting this sliding method, when facing different workpiece types, it is not necessary to repeatedly disassemble the first supporting seat, further improving the work efficiency;

[0017] 2. By changing the connection relationship between the base and the seat body of the first supporting seat, the seat body can swing relative to the base, further reducing the assembly difficulty of the workpiece for workers; compared with the previous situation where the first supporting seat is fixed and the angle cannot be adjusted, the supporting device provided by the present utility model further improves the assembly effect. Description of the Drawings

[0018] The present utility model will become clearer with reference to the preferred embodiments shown in the accompanying drawings. The above and other objects, features, and advantages of the present utility model will become more apparent. In all the drawings, the same reference numerals indicate the same parts, and the drawings are not deliberately drawn to scale in actual size, with the emphasis on showing the gist of the present utility model.

[0019] Figure 1 It is a schematic structural diagram of a support device in an AGV vehicle in the prior art;

[0020] Figure 2 It is an exploded structural diagram of the support device in the present utility model;

[0021] Figure 3 It is a schematic overall structural diagram of the AGV vehicle in the present utility model;

[0022] Figure 4 It is a schematic structural diagram of the first perspective of the connection between the support device and the lifting device in the present utility model;

[0023] Figure 5 It is a schematic structural diagram of the second perspective of the connection between the support device and the lifting device in the present utility model;

[0024] Figure 6 It is a schematic diagram of the swinging direction of the seat body in the present utility model;

[0025] In the figure: support device 1, support base plate 10, first support seat 11, base 110, seat body 111, sliding assembly 12, slide rail 120, slider 121, first driving member 13, electric cylinder 130, pull rod 131, hinge seat 14, hinge hole 140, hinge shaft 15, lock seat 16, adjustment hole 160, pin 17, lock hole 18, connecting plate 19, second support seat 190; vehicle body 2, lifting device 3, fixing plate 30, guide groove 301, jacking mechanism 4, second driving member 41, motor 410, lead screw 411, scissor arm 42, first connecting rod 420, second connecting rod 421, fixed end 422, movable end 423, movable wheel 424. Detailed implementation manners

[0026] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively with reference to the relevant accompanying drawings.

[0027] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated with it, or there may be an intermediate element at the same time. The terms "installation", "one end", "the other end" and similar expressions used herein are only for the purpose of illustration.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this technology belongs. The terms used in the description herein are for the purpose of describing specific embodiments only and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] Reference Figures 1-6 , the present utility model provides a support device 1, including a support base plate 10, a first support seat 11 and a sliding assembly 12. The sliding assembly 12 can drive the first support seat 11 to slide on the support base plate 10, so as to adjust the support position of the workpiece. When in use, the workpiece is placed on the first support seat 11. Therefore, the first support seat 11 mainly plays a supporting role; the support base plate 10, the sliding assembly 12 and the first support seat 11 are sequentially connected, and the sliding assembly 12 extends along the length direction of the support base plate 10; there are at least two first support seats 11, and both of the two first support seats 11 are slidably connected to the support base plate 10 through the sliding assembly 12; in this embodiment, the two first support seats 11 are arranged oppositely. The so-called opposite arrangement means that the two first support seats 11 are symmetrically arranged with each other. When the two first support seats 11 slide, they can approach or move away from each other, so as to adjust the support positions of the two first support seats 11 according to different sizes of the workpiece, which is more convenient. The support device 1 is applicable to the assembly and handling operations of a single AGV vehicle, and is also applicable to the operations of AGV vehicles with multi-vehicle linkage.

[0030] The specific working process is as follows: Adjust the distance between the two first support seats 11 according to the size of the workpiece, that is, by sliding the two first support seats 11 to make the two first support seats 11 approach or move away from each other. After determining the sliding position, place the workpiece on the first support seat 11 for assembly or handling; in this embodiment, the two first support seats 11 can support the same workpiece or support different workpieces respectively, and can be freely adjusted according to actual needs. In this embodiment, the way to drive the first support seat 11 to slide can be to directly slide the first support seat 11 manually by hand, or to push the first support seat 11 to slide on the sliding assembly 12 through an electric cylinder 130 or a cylinder.

[0031] The support device 1 provided by the present utility model has the following beneficial effects:

[0032] By providing the sliding assembly 12 on the support base plate 10, it is convenient for workers to quickly adjust the support position of the first support seat 11. Compared with the past, when encountering different workpiece types, it is necessary to disassemble the support seat and re-adjust the support position (such as Figure 1) For this embodiment, by adopting this sliding method, when facing different workpiece types, there is no need to repeatedly disassemble the first support base 11, further improving the work efficiency.

[0033] Refer to Figure 2 and 6 , in a preferred embodiment, the first support base 11 includes a base 110 and a seat body 111. The seat body 111 is hinged to the base 110, and the bottom of the base 110 is connected to the sliding assembly 12. That is, the seat body 111 is hinged to the base 110, and the bottom of the base 110 is connected to the sliding assembly 12. Through the cooperation between the base 110 and the sliding assembly 12, the seat body 111 can be driven to reciprocate on the support plate 10; the support device 1 further includes a first driving member 13. The output end of the first driving member 13 is connected to the seat body 111, and the first driving member 13 can drive the seat body 111 to swing relative to the base 110. In this embodiment, the first driving member 13 includes an electric cylinder 130 and a pull rod 131. The electric cylinder 130 is fixed to the support plate 10, one end of the pull rod 131 is connected to the output end of the electric cylinder 130, and the other end is connected to the seat body 111. The electric cylinder 130 drives the seat body 111 to swing through the pull rod 131. Specifically, the electric cylinder 130 can drive the pull rod 131 to move up and down (i.e., Figure 6 the up and down in Figure 6 ). When the electric cylinder 130 drives the pull rod 131 to move upward, it can be regarded as the pull rod 131 generating an upward thrust on the seat body 111; when the electric cylinder 130 drives the pull rod 131 to move downward, it is equivalent to the pull rod 131 generating a downward pulling force on the seat body 111, thereby realizing the adjustment of different angles of the seat body 111 (i.e., the seat body 111 can swing relative to the base 110). Regarding the swinging direction of the seat body 111, refer to Figure 6 the movement direction indicated by the arrow in

[0034] In the actual use process, there will be one of the following situations: that is, two first support seats 11 respectively support two workpieces, and then it is necessary to assemble the two workpieces on the AGV vehicle; then when the two first support seats 11 support the two workpieces, since the two workpieces are separated at this time, it is necessary to connect the two workpieces through an assembly connecting piece (for example, two long strip-shaped workpieces are respectively placed on two seat bodies 111, and an assembly connecting piece is often required between the two long strip-shaped workpieces to connect the two workpieces, such as a workpiece in the shape of a ladder). In this case, it will be necessary to adjust the angle of the workpiece to facilitate the assembly by the worker. Therefore, by setting the first driving member 13 to drive the seat body 111 to swing, the adjustment of the placement angle of the workpiece can be realized, and thus the subsequent assembly work of the worker is facilitated.

[0035] Reference Figures 2-6 , in a further preferred embodiment, hinge seats 14 are respectively arranged on both sides of the base 110. One end of the hinge seat 14 is connected to the base 110, and the other end protrudes upward relative to the base 110. In this embodiment, the hinge seat 14 and the base 110 are integrally arranged, which can improve its overall strength. A hinge hole 140 is formed in the hinge seat 14, and the hinge hole 140 runs through the hinge seat 14 in the thickness direction; the so-called running through in the thickness direction means that Figure 2 from the perspective in Figure 5 , the hinge hole 140 runs through the hinge seat 14 in the width direction; hinge shafts 15 are respectively arranged on both sides of the seat body 111. One end of the hinge shaft 15 is connected to the seat body 111, and the other end extends outward relative to the seat body 111; the hinge shaft 15 can extend into the hinge hole 140. During installation, the hinge shafts 15 at both ends of the seat body 111 are inserted into the hinge hole 140, that is, the assembly between the seat body 111 and the base 110 is realized. At the same time, the hinge shaft 15 can rotate relative to the hinge hole 140, so the hinge between the seat body 111 and the base 110 is also realized. In this embodiment, taking

[0036] Reference Figures 2-6, in a preferred embodiment, the sliding assembly 12 includes a sliding rail 120 and a slider 121 connected to each other. The sliding rail 120 extends along the length direction of the support platen 10; there is at least one sliding rail 120, preferably two. In this embodiment, there are two sliding rails 120, and the two sliding rails 120 are arranged at intervals. The first support base 11 includes a base 110 and a seat body 111 provided on the base 110. The base 110 can be slidably connected to the sliding rail 120 through the slider 121; an adjusting assembly is provided on the support platen 10, and the adjusting assembly can lock or loosen the base 110. When the adjusting assembly locks the base 110, the base 110 is fixed to the support platen 10, thereby preventing the first support base 11 from shaking during transportation; when the adjusting assembly loosens the base 110, the base 110 can reciprocate relative to the support platen 10, thereby facilitating the position adjustment of the first support base 11.

[0037] Reference Figures 2-6 , in a preferred embodiment, the adjusting assembly includes a lock seat 16 and a plug pin 17. The lock seats 16 are arranged at intervals on both sides of the sliding rail 120, that is, the lock seats 16 are arranged outside the support platen 10, and the sliding rail 120 is arranged between the lock seats 16. One end of the lock seat 16 is fixed to the support platen 10, and the other end extends upward relative to the support platen 10; an adjusting hole 160 is formed in the lock seat 16, and the adjusting hole 160 extends along the thickness direction of the lock seat 16 (that is, Figure 2 the height direction of the lock seat 16 in the figure); locking holes 18 are formed on both sides of the base 110, and the locking holes 18 penetrate through the base 110 along the thickness direction. One end of the plug pin 17 can pass through the locking hole 18 and be inserted into the adjusting hole 160 to fix the base 110 to the support platen 10; when the position of the first support base 11 needs to be adjusted, only the plug pin 17 needs to be pulled out of the locking hole 18. In another embodiment, the plug pin 17 can also be replaced by a bolt, and by providing a threaded structure in the adjusting hole 160 and connecting the bolt to the lock seat 16 by thread, the function of locking or loosening the base 110 can also be achieved.

[0038] Reference Figures 2-6 , in a preferred embodiment, there are multiple adjusting holes 160, and the multiple adjusting holes 160 are arranged at intervals along the length direction of the lock seat 16. By providing multiple adjusting holes 160, the position adjustment of the first support base 11 is further facilitated to meet the support position requirements of workpieces of different sizes.

[0039] Reference Figure 3, in a preferred embodiment, connecting plates 19 are provided on both sides of the support platen 10. One end of each connecting plate 19 is connected to the support platen 10, and the other end extends outward relative to the support platen 10. Second support seats 190 are provided on the connecting plates 19, and the second support seats 190 are spaced apart from the first support seats 11. In this embodiment, the support platen 10 and the connecting plates 19 can be integrally provided, which can also improve the overall strength. The second support seats 190 mainly play an auxiliary support role. By providing the second support seats 190 respectively in front of and behind the first support seats 11, the contact area between the support seats and the workpiece can be increased, thereby playing a better supporting role for the workpiece and also improving the stability of the AGV vehicle during the handling of the workpiece. In this embodiment, the support surfaces of the second support seats 190 and the first support seats 11 are at the same horizontal height. That is to say, when the workpiece is placed on the first support seats 11 and the second support seats 190, the workpiece is in a balanced state as a whole rather than in a tilted state.

[0040] Reference Figures 3-5 , an AGV vehicle includes a vehicle body 2 and a lifting device 3, and further includes the support device 1 as described in any one of the above preferred embodiments; both the lifting device 3 and the support device 1 are provided inside the vehicle body 2. The lifting device 3 includes a fixing plate 30 and a jacking mechanism 4 provided on the fixing plate 30. The jacking mechanism 4 is located between the fixing plate 30 and the support platen 10, and the jacking mechanism 4 can drive the support device 1 to perform lifting movements so as to meet the assembly requirements of different workpieces.

[0041] Reference Figure 4 and 5 , in a preferred embodiment, the jacking mechanism 4 includes a second driving member 41 and a scissor arm 42 connected to each other. The scissor arm 42 is connected to the support platen 10, and the second driving member 41 can drive the scissor arm 42 to extend or contract; when the scissor arm 42 extends, it can drive the support platen 10 to rise, and when the scissor arm 42 contracts, it can drive the support platen 10 to descend. In this embodiment, the second driving member 41 includes a motor 410 and a lead screw 411 provided on the fixing plate 30. One end of the lead screw 411 is connected to the output end of the motor 410, and the other end is connected to the scissor arm 42. The motor 410 drives the scissor arm 42 to move through the lead screw 411. Specifically, the motor 410 drives the lead screw 411 to perform a circumferential movement. At the same time, the lead screw 411 converts the circumferential movement into a linear movement, thereby driving the scissor arm 42 to perform a reciprocating movement along the length direction of the fixing plate 30 to extend or contract.

[0042] Reference Figure 4 and 5, in a preferred embodiment, the scissors arm 42 includes a first connecting rod 420 and a second connecting rod 421 that are movably connected (such as hinged). Both the first connecting rod 420 and the second connecting rod 421 include a fixed end 422 and a movable end 423. The fixed end 422 and the movable end 423 of the first connecting rod 420 are respectively connected to the support platen 10 and the fixed plate 30, and the fixed end 422 and the movable end 423 of the second connecting rod 421 are respectively connected to the fixed plate 30 and the support platen 10. Guide grooves 301 are provided at the top of the fixed plate 30 and the bottom of the support platen 10. In this embodiment, the guide grooves 301 extend along the length direction of the fixed plate 30. Movable wheels 424 are respectively provided on the movable ends 423 of the first connecting rod 420 and the second connecting rod 421, and the movable wheels 424 are embedded in the guide grooves 301. When the second driving member 41 drives the movable end 423 of the first connecting rod 420 to move, the movable wheels 424 can slide along the guide grooves 301. The working principle of the scissors arm 42 is prior art (reference can be made to Chinese patent document CN218145657U), and will not be elaborated here.

[0043] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A support device, characterized in that: It includes a support platen, a first support seat, and a sliding assembly. The support platen, the sliding assembly, and the first support seat are connected in sequence. The sliding assembly extends along the length direction of the support platen. There are at least two first support seats, and both of the two first support seats are slidably connected to the support platen through the sliding assembly. When the two first support seats slide, they can approach each other or move away from each other.

2. The support device according to claim 1, characterized in that, The first support seat includes a base and a seat body. The seat body is hinged to the base, and the bottom of the base is connected to the sliding assembly. The support device further includes a first driving member. The output end of the first driving member is connected to the seat body, and the first driving member can drive the seat body to swing relative to the base.

3. The support device according to claim 2, wherein Hinge seats are respectively arranged on both sides of the base. One end of the hinge seat is connected to the base, and the other end protrudes upward relative to the base. A hinge hole is provided in the hinge seat, and the hinge hole penetrates along the thickness direction of the hinge seat. Hinge shafts are respectively arranged on both sides of the seat body. One end of the hinge shaft is connected to the seat body, and the other end extends outward relative to the seat body. The hinge shaft can extend into the hinge hole.

4. The support device according to claim 1, wherein The sliding assembly includes a sliding rail and a slider which are connected. The sliding rail extends along the length direction of the support platen. The first support seat includes a base and a seat body arranged on the base. The base can be slidably connected to the sliding rail through the slider. An adjusting assembly is provided on the support platen. The adjusting assembly can lock or loosen the base. When the adjusting assembly locks the base, the base is fixed to the support platen. When the adjusting assembly loosens the base, the base can reciprocate relative to the support platen.

5. The support device according to claim 4, characterized in that The adjusting assembly includes a lock seat and a pin. The lock seats are arranged at intervals on both sides of the sliding rail. One end of the lock seat is fixed to the support platen, and the other end extends upward relative to the support platen. An adjusting hole is provided in the lock seat, and the adjusting hole extends along the thickness direction of the lock seat. Lock holes are provided on both sides of the base, and the lock holes penetrate along the thickness direction of the base. One end of the pin can pass through the lock hole and insert into the adjusting hole to fix the base to the support platen.

6. The support device according to claim 5, characterized in that There are multiple adjusting holes, and the multiple adjusting holes are arranged at intervals along the length direction of the lock seat.

7. The support device according to claim 1, characterized in that, Connection plates are arranged on both sides of the support platen. One end of the connection plate is connected to the support platen, and the other end extends outward relative to the support platen. A second support seat is provided on the connection plate, and the second support seat is arranged at an interval from the first support seat.

8. An AGV vehicle, characterized in that, It includes a vehicle body and a lifting device, and further includes the support device according to any one of the above claims 1-7. The lifting device and the support device are both arranged in the vehicle body. The lifting device includes a fixing plate and a jacking mechanism arranged on the fixing plate. The jacking mechanism is located between the fixing plate and the support platen, and the jacking mechanism can drive the support device to perform lifting movement.

9. The AGV vehicle according to claim 8, wherein The jacking mechanism includes a second driving member and a scissors arm which are connected to each other. The scissors arm is connected to the support platen. The second driving member can drive the scissors arm to extend or contract. When the scissors arm extends, it can drive the support platen to rise. When the scissors arm contracts, it can drive the support platen to descend.

10. The AGV vehicle according to claim 9, characterized in that, The scissors arm includes a first connecting rod and a second connecting rod which are movably connected. Both the first connecting rod and the second connecting rod include a fixed end and a movable end. The fixed end and the movable end of the first connecting rod are respectively connected to the support platen and the fixed plate. The fixed end and the movable end of the second connecting rod are respectively connected to the fixed plate and the support platen. Guide grooves are provided at the top of the fixed plate and the bottom of the support platen. Movable wheels are respectively provided at the movable ends of the first connecting rod and the second connecting rod. The second driving member is connected to the movable end of the first connecting rod. When the second driving member drives the movable end of the first connecting rod to move, the movable wheels can slide along the guide grooves.

Images