Multifunctional folding tricycle

Abstract

The utility model discloses a multifunctional folding tricycle, which relates to the field of folding tricycles and comprises a front wheel part, a tricycle body, a seat frame part and a goods shelf part. The front wheel part at least comprises a hand-operated driving mechanism and a front bull wheel, and a transmission chain group is arranged between the hand-operated driving mechanism and the front bull wheel; the front wheel part is rotationally connected with the front end of the vehicle body and locked through a fastener. The seat frame part is rotationally connected with the middle position of the vehicle body and locked through the supporting and adjusting mechanism. The goods shelf part is assembled at the rear end of the vehicle body. The rear end of the vehicle body is rotationally connected with a rear wheel. An electric driving mechanism is assembled on the bicycle body, and a transmission device is arranged between the electric driving mechanism and the rear wheels. The tricycle has a manual driving mode and an electric driving mode and can be folded.

Description

Technical Field

[0001] This utility model relates to a folding tricycle, and more particularly to a multi-functional folding tricycle. Background Technology

[0002] As a means of transportation, tricycles have unique advantages compared to other modes of transport; especially when people go out shopping, small cars are not allowed in many places.

[0003] Currently, tricycles are mainly divided into two types: human-powered tricycles and electric tricycles. Human-powered tricycles are labor-intensive and slow; electric tricycles are fast but pose a higher risk in crowded places. Furthermore, both human-powered and electric tricycles cannot be folded, making them inconvenient to transport. Tricycles can only be used in a specific area and cannot be used across regions or cities.

[0004] In conclusion, given the limited functionality of traditional tricycles, there is an urgent need in this field to develop a multifunctional folding tricycle. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-functional folding tricycle that has both manual and electric drive modes and can be folded, in order to address the problems mentioned above.

[0006] The technical solution adopted by this utility model is as follows: A multi-functional folding tricycle includes a front wheel section, a vehicle body, a seat frame section, and a rack section; the front wheel section includes at least a hand-cranked drive mechanism and a large front wheel, and a transmission chain is provided between the hand-cranked drive mechanism and the large front wheel; the front wheel section is rotatably connected to the front end of the vehicle body and locked by fasteners; the seat frame section is rotatably connected to the middle position of the vehicle body and locked by a support adjustment mechanism; the rack section is assembled at the rear end of the vehicle body; a rear wheel is rotatably connected to the rear end of the vehicle body; an electric drive mechanism is assembled on the vehicle body, and a transmission device is provided between the electric drive mechanism and the rear wheel.

[0007] Furthermore, the front wheel section also includes a central shaft cylinder hinged to the front end of the vehicle body. The hinge position of the central shaft cylinder to the front end of the vehicle body is close to the lower part of the vehicle body, allowing the front wheel section to rotate and fold downwards towards the vehicle body. A front wheel fork is coaxially rotatably mounted inside the central shaft cylinder, and the large front wheel is rotatably mounted at the bottom of the front wheel fork. A connecting seat is provided on the top of the front wheel fork, and a support block is mounted between the connecting seat and the hand-cranked drive mechanism, supporting the hand-cranked drive mechanism. A transition gear is rotatably mounted on the connecting seat, a first transmission chain is provided between the hand-cranked drive mechanism and the transition gear, and a second transmission chain is provided between the transition gear and the large front wheel. The first and second transmission chains together constitute a transmission chain group.

[0008] Furthermore, the connecting seat is provided with a folding slide, and the support block is slidably connected to the folding slide, so that the support block can be folded to the position of the large forward wheel; the support block is locked to the connecting seat by a locking member.

[0009] Furthermore, the hand-cranked drive mechanism includes a hand crank and a drive gear arranged coaxially. Both the hand crank and the drive gear are rotatably connected to the support member, and the axis of rotation is the axis of the hand crank. The first transmission chain is connected between the drive gear and the intermediate gear.

[0010] Furthermore, the vehicle body includes a main body and a telescopic part, the telescopic part being slidably connected to the main body to achieve length adjustment of the vehicle body; the front wheel part is hinged to the front end of the telescopic part.

[0011] Furthermore, a placement groove is provided on the lower end face of the main body for placing the front wheel part.

[0012] Furthermore, the seat frame is hinged to the main body, and a support adjustment mechanism is disposed between the main body and the seat frame; the support adjustment mechanism includes a support adjustment member and a positioning pin disposed on the main body, one end of the support adjustment member is hinged to the seat frame, and the support adjustment member has a plurality of positioning holes along the length direction, and the positioning pin can engage with one of the positioning holes.

[0013] Furthermore, the seat frame includes a guide tube, a support rod is slidably connected inside the guide tube, one end of the support rod is located inside the guide tube and an elastic element is provided between it and the bottom of the guide tube, and the other end of the support rod is rotatably connected to a strip seat plate, and a seat plate fixing bolt is provided at the rotatable connection position between the strip seat plate and the support rod; the strip seat plate is a telescopic plate.

[0014] Furthermore, the shelf portion includes a storage rack hinged to the vehicle body, and the storage rack can be fixed to the vehicle body.

[0015] The vehicle body is equipped with a support frame, which can be positioned and abutted against the storage rack.

[0016] Or / and a support rod is provided between the support frame and the shelf, one end of the support rod is hinged to the shelf, and the other end of the support rod can be positioned and abutted against the support frame;

[0017] Or / and a leg is rotatably connected to the support rod, one end of the leg can be positioned and abutted against the support frame, and the other end of the leg can abut against the ground or be suspended on the shelf.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0019] 1. This utility model achieves the folding of the tricycle by folding the front wheel and seat frame towards the main body of the vehicle, thereby reducing the space occupied by the tricycle and facilitating its transportation.

[0020] 2. This utility model can drive the front wheel with a hand-cranked drive mechanism and drive the rear wheel with an electric drive mechanism. The two drive methods do not interfere with each other and can be switched at any time, making it convenient for the tricycle to change the drive method at any time according to the applicable scenario.

[0021] 3. The seat frame of this utility model can be adjusted in angle through the support adjustment mechanism, thereby adjusting the distance between the seat frame and the front wheel, making it convenient for people with different arm lengths to use;

[0022] 4. This utility model can be used as a reclining chair when the tricycle is not being ridden. The seat frame serves as the backrest, and the support adjustment mechanism can adjust the angle of the seat frame relative to the main body of the vehicle, thereby adjusting the tilt of the reclining chair backrest to meet comfort requirements. Attached Figure Description

[0023] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a side view of the folded structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the front view of the folded structure of this utility model;

[0027] Markings in the diagram: 1-Hand crank; 2-Drive gear; 3-First drive chain; 4-Support block; 5-Transition gear; 6-Second drive chain; 7-Front wheel fork; 8-Front wheel; 9-Main body; 10-Telescopic part; 11-Support adjustment component; 12-Seat plate; 13-Support rod; 14-Guide tube; 15-Elastic component; 16-Shelf; 17-Foot support rod; 18-Foot bracket; 19-Support frame; 20-Rear wheel; 21-Folding slide; 22-Connecting seat. Detailed Implementation

[0028] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0029] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is merely one example of a series of equivalent or similar features.

[0030] Example 1

[0031] like Figure 1 - Figure 3 As shown, a multi-functional folding tricycle includes a front wheel section, a body body, a seat frame section, and a shelf section; the front wheel section includes at least a hand-cranked drive mechanism and a front large wheel 8, and a transmission chain is provided between the hand-cranked drive mechanism and the front large wheel 8. The transmission chain transmits the rotational power generated by the hand-cranked drive mechanism to the front large wheel 8, so that the front large wheel 8 can drive the tricycle as a whole to move forward.

[0032] The front wheel section is rotatably connected to the front end of the vehicle body via a hinge and is locked by fasteners. When it is necessary to fold the front wheel section, the fasteners can be opened to allow the front wheel section to rotate relative to the vehicle body, and the front wheel section rotates downwards towards the vehicle body to achieve folding of the front wheel section.

[0033] In this embodiment, the fastener can be a latching fastener, with two parts of the latching fastener respectively installed on the front wheel and the vehicle body.

[0034] The seat frame is rotatably connected to the middle position of the vehicle body, with the rotatable connection position on the upper surface of the vehicle body. The seat frame can be rotated towards the front end of the vehicle body to achieve folding. The seat frame and the vehicle body are locked together by a support adjustment mechanism. That is, the seat frame, the vehicle body, and the support adjustment mechanism together form a triangular stable structure, which can stably support the seat frame.

[0035] In this embodiment, the support adjustment mechanism can adjust the angle between the seat frame and the main body of the vehicle. When the tricycle is used for riding, the angle of the seat frame can be adjusted by the support adjustment mechanism, thereby adjusting the distance between the seat frame and the front wheel, making it convenient for people with different arm lengths to use. When the tricycle is not being ridden, it can be used as a reclining chair, with the seat frame serving as the backrest. The support adjustment mechanism can adjust the angle of the seat frame relative to the main body of the vehicle, thereby adjusting the tilt of the reclining chair backrest to meet comfort requirements.

[0036] The rack section is assembled at the rear of the vehicle body and is used for loading goods. It can be folded slightly towards the vehicle body.

[0037] The rear end of the vehicle body is rotatably connected to a rear wheel 20; an electric drive mechanism is mounted on the vehicle body, and a transmission device is provided between the electric drive mechanism and the rear wheel 20. The electric drive mechanism drives the rear wheel 20 through the transmission device, and the entire tricycle can be pushed by the rear wheel 20.

[0038] In this embodiment, the tricycle can drive the front wheel 8 by a hand-cranked drive mechanism and the rear wheel 20 by an electric drive mechanism. The two drive methods do not interfere with each other and can be switched at any time, making it convenient for the tricycle to change the drive method according to the applicable scenario.

[0039] Furthermore, the electric drive mechanism includes an energy storage battery and a drive motor. The energy storage battery supplies power to the drive motor, and the drive motor is connected to a reduction gearbox. The reduction gearbox is a commonly used reduction device in the art and will not be described in detail in this embodiment. The reduction gearbox and the rear wheel 20 can be connected by gears or by a transmission chain to realize motion transmission, thereby enabling the electric drive tricycle to move forward.

[0040] In this embodiment, the tricycle is folded by folding the front wheel and seat frame towards the main body of the vehicle, thereby reducing the space occupied by the tricycle and making it easier to transport.

[0041] Example 2

[0042] Based on Example 1, further feasible implementation methods are proposed.

[0043] In one feasible embodiment, the front wheel portion further includes a central shaft cylinder hinged to the front end of the vehicle body. The central shaft cylinder provides support and bears the force arm between the front large wheel 8 and the vehicle body. The hinge position of the central shaft cylinder to the front end of the vehicle body is close to the lower part of the vehicle body, allowing the front wheel portion to rotate and fold downwards towards the vehicle body. A front wheel fork 7 is coaxially rotatably mounted inside the central shaft cylinder. The front wheel fork 7 is Y-shaped, and a bearing is provided between the central shaft cylinder and the front wheel fork 7 to ensure stable rotation of the front wheel fork 7. The front large wheel 8 is rotatably mounted at the bottom of the front wheel fork 7, and the front large wheel 8 can move freely relative to the front wheel fork 7. When rotated, the front fork 7 only changes the deflection direction of the front large wheel 8; a connecting seat 22 is provided on the top of the front fork 7, and a support block 4 is assembled between the connecting seat 22 and the hand-cranked drive mechanism. The support block 4 supports the hand-cranked drive mechanism and provides the installation position for the hand-cranked drive mechanism. The hand-cranked drive mechanism and the support block 4 are rotatably connected; a transition gear is rotatably provided on the connecting seat 22, a first transmission chain 3 is provided between the hand-cranked drive mechanism and the transition gear, and a second transmission chain 6 is provided between the transition gear and the front large wheel 8. The first transmission chain 3 and the second transmission chain 6 together constitute a transmission chain group.

[0044] In this embodiment, the hand-cranked drive mechanism transmits power to the transition gear through the first transmission chain 3, and then the transition gear transmits power to the front wheel 8 through the second transmission chain 6. The front wheel 8 is equipped with a driven gear, and the second transmission chain 6 is connected to the driven gear, so that the hand-cranked drive mechanism drives the front wheel 8 to rotate, thereby moving the tricycle forward as a whole.

[0045] In this embodiment, the user can apply a deflection force to the hand-cranked drive mechanism while riding. This deflection force will cause the support block 4, connecting seat 22 and front wheel fork 7 to deflect relative to the central shaft, and in turn cause the front wheel 8 to deflect relative to the main body of the vehicle, so that the tricycle can turn while moving forward.

[0046] In one feasible specific implementation, the connecting seat 22 is provided with a folding slide 21, the support block 4 is slidably connected to the folding slide 21, the folding slide 21 is arc-shaped, and the support block 4 can slide along the folding slide 21, so that the support block 4 can fold at the position of the forward large wheel 8; the support block 4 is locked to the connecting seat 22 by a locking member, which can be a locking screw or a bolt.

[0047] In this embodiment, when the front wheel needs to be folded, the locking device can be opened, and the support block 4 can slide freely. The support block 4, along with the hand-cranked drive mechanism, slides along the folding slide 21, realizing the folding of the support block 4 and the hand-cranked drive mechanism towards the front large wheel 8. Then, the position of the support block 4 is locked by the locking device. After that, the front wheel fork 7 is rotated, causing the front large wheel 8 to deflect at an angle until the hub end face of the front large wheel 8 is parallel to the body body. Then, the fastener is opened, the central shaft cylinder moves, and can generate rotation, thereby realizing the rotation of the front wheel part towards the lower part of the body body, completing the folding of the front wheel part.

[0048] In this embodiment, the wheel hub end face of the front large wheel 8 is rotated to be parallel to the main body of the vehicle before folding, which minimizes the space occupied after folding.

[0049] In one feasible specific implementation, the hand-cranked drive mechanism includes a hand crank 1 and a drive gear 2 coaxially arranged. Both the hand crank 1 and the drive gear 2 are rotatably connected to the support member, and the axis of rotation is the axis of the hand crank 1. The user drives the drive gear 2 to rotate by rotating the hand crank 1, and its structure is similar to the pedal drive structure of a bicycle. The first transmission chain 3 is connected between the drive gear 2 and the intermediate gear 5.

[0050] Example 3

[0051] Based on any one of the implementation methods in Examples 1-2, further feasible implementation methods are proposed.

[0052] In one feasible specific implementation, the vehicle body includes a main body 9 and a telescopic part 10. The telescopic part 10 is slidably connected to the main body 9. The length of the vehicle body is adjusted by adjusting the extension length of the telescopic part 10. The front end of the vehicle body is the front end of the telescopic part 10. The front wheel part is hinged to the front end of the telescopic part 10.

[0053] In one feasible specific implementation, a placement groove is provided on the lower end face of the main body 9. When the front wheel part is folded, the front wheel part can be folded into the placement groove, further reducing the space occupied by the tricycle after folding.

[0054] Example 4

[0055] Based on any one of the implementation methods in Examples 1-2, further feasible implementation methods are proposed.

[0056] In one feasible embodiment, the seat frame includes a guide tube 14, within which a support rod 13 is slidably connected. Adjusting the length of the support rod 13 extending beyond the guide tube 14 adjusts the overall height of the strip seat 12. The position of the support rod 13 relative to the guide tube 14 can be locked using a locking mechanism. This locking mechanism is a commonly used structure in the art and can be analogous to the locking mechanism used for adjusting the height of a bicycle seat. In this embodiment, there are two guide tubes 14, respectively mounted on both sides of the vehicle body. Each guide tube 14 has a support rod 13 slidably connected within it, and the two support rods 13 can be welded together. A crossbeam is provided to enhance the support strength of the support rod 13. The other end of the support rod 13 is rotatably connected to a strip seat 12, which is installed between the two support rods 13. The two support rods 13 are rotatably connected to both ends of the strip seat 12. A seat 12 fixing bolt is provided at the rotatable connection position between the strip seat 12 and the support rod 13. The seat 12 fixing bolt locks the angle of the strip seat 12. Specifically, the seat 12 fixing bolt can be a wing bolt. Support seats are provided at both ends of the strip seat 12 and below the strip seat 12. The wing bolt passes through the support seats and the support rod 13 to achieve locking.

[0057] It should be noted that adjusting and fixing the angle of the strip seat 12 has at least the following effects.

[0058] First, after the angle of the seat frame is adjusted by the support adjustment mechanism, the angle of the strip seat 12 can be adjusted to keep the seat 12 in a horizontal state, thereby improving the user's comfort when riding.

[0059] Secondly, when the seat frame is used as the backrest of a recliner, the strip seat 12 can be adjusted to be collinear with the axis of the support rod 13 to improve the comfort of the user's backrest.

[0060] It should be noted that adjusting the height of the support rod 13 to adjust the height of the strip seat 12 is mainly used when the seat frame is used as the backrest of a recliner.

[0061] In one feasible embodiment, one end of the support rod 13 is located inside the guide tube 14 and an elastic element 15 is provided between the support rod 13 and the bottom of the guide tube 14. The elastic element 15 has a shock absorption function, which can reduce the vibration experienced by the user during riding and improve riding comfort.

[0062] In one feasible embodiment, a handle is slidably connected to the strip seat 12, and the handle can be limited by the strip seat 12 so that the handle will not detach from the strip seat 12; after the seat frame is rotated and folded onto the vehicle body, the tricycle can be used as a towing tool, and the handle serves as the force-bearing component of the towing tool.

[0063] Furthermore, the guide tube 14 of the seat frame is hinged to the main body 9, and a support adjustment mechanism is disposed between the main body 9 and the guide tube 14 of the seat frame. The support adjustment mechanism includes a support adjustment member 11 and a positioning pin disposed on the main body 9. One end of the support adjustment member 11 is hinged to the seat frame, and a plurality of positioning holes are provided on the support adjustment member 11 along the length direction. The positioning pin can engage with one of the positioning holes. By engaging different positioning holes with the positioning pin, the angle of the guide tube 14 relative to the vehicle body is adjusted, thereby realizing the adjustment of the angle of the seat frame relative to the vehicle body.

[0064] Example 5

[0065] Based on any one of the implementation methods in Examples 1-4, further feasible specific implementation methods are proposed.

[0066] In one feasible implementation, the shelf portion includes a storage rack 16 hinged to the vehicle body. The storage rack 16 can be fixed to the vehicle body, and the hinge allows the storage rack 16 to rotate relative to the vehicle body, thereby allowing the storage rack 16 to fold towards the rear wheel 20, further reducing the space occupied by the tricycle after folding. Of course, fixing the storage rack 16 can be achieved by using a hook and loop fastener, which is a commonly used locking part in the art and will not be described in detail in this specification; or / and other methods can be used for positioning.

[0067] Example 6

[0068] Based on Example 5, a method for positioning the shelf 16 is further proposed.

[0069] In the first embodiment, a support frame 19 is provided on the vehicle body, and the support frame 19 can be positioned and abutted against the shelf 16, with the shelf 16 being supported and positioned by the support frame 19.

[0070] Specifically, the shelf 16 is provided with several positioning slots, and one end of the support frame 19 can be supported in the positioning slots; one end of the shelf 16 is hinged to the main body of the vehicle body, and the positioning slots are located at the other end of the shelf 16, thereby realizing the support and positioning of the shelf 16 by the support frame 19.

[0071] The second embodiment can coexist with the first embodiment. A support rod 17 is provided between the support frame 19 and the shelf 16. One end of the support rod 17 is hinged to the shelf 16, and the other end of the support rod 17 can be positioned and abutted against the support frame 19. A positioning groove is provided on the support rod 17, and the shelf 16 is supported by the support rod 17 in conjunction with the support frame 19.

[0072] The third implementation method can coexist with the second implementation method; a leg 18 is rotatably connected to the support rod 17, one end of the leg 18 can be positioned and abutted against the support frame 19, and the other end of the leg 18 can abut against the ground or be suspended on the shelf 16. The support rod 17 is supported by the leg 18, thereby achieving the positioning and support of the shelf 16.

[0073] It should be noted that the above three methods can be applied to different occasions. For example, if the shelf 16 is used as a resting stool after the tricycle is folded, the third method can be adopted to support the shelf 16.

[0074] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A multi-functional folding tricycle, characterized in that: The vehicle includes a front wheel section, a body body, a seat frame section, and a rack section. The front wheel section includes at least a hand-cranked drive mechanism and a large front wheel (8), and a transmission chain is provided between the hand-cranked drive mechanism and the large front wheel (8). The front wheel section is rotatably connected to the front end of the body body and locked by fasteners. The seat frame section is rotatably connected to the middle position of the body body and locked by a support adjustment mechanism. The rack section is mounted on the rear end of the body body. The rear end of the body body is rotatably connected to a rear wheel (20). An electric drive mechanism is mounted on the body body, and a transmission device is provided between the electric drive mechanism and the rear wheel (20).

2. The multi-functional folding tricycle according to claim 1, characterized in that: The front wheel section also includes a central shaft cylinder hinged to the front end of the vehicle body. The hinge position of the central shaft cylinder to the front end of the vehicle body is close to the lower part of the vehicle body, so that the front wheel section can be rotated and folded downwards towards the vehicle body. A front wheel fork (7) is mounted coaxially inside the central shaft cylinder, and the front large wheel (8) is rotatably mounted at the bottom of the front wheel fork (7). A connecting seat (22) is provided on the top of the front wheel fork (7). A support block (4) is mounted between the connecting seat (22) and the hand-cranked drive mechanism, and the support block (4) supports the hand-cranked drive mechanism. A transition gear is rotatably provided on the connecting seat (22). A first transmission chain (3) is provided between the hand-cranked drive mechanism and the transition gear. A second transmission chain (6) is provided between the transition gear and the front large wheel (8). The first transmission chain (3) and the second transmission chain (6) together constitute a transmission chain group.

3. The multi-functional folding tricycle according to claim 2, characterized in that: The connecting seat (22) is provided with a folding slide (21), and the support block (4) is slidably connected to the folding slide (21), so that the support block (4) can be folded to the position of the forward large wheel (8); the support block (4) is locked to the connecting seat (22) by a locking member.

4. The multi-functional folding tricycle according to claim 2, characterized in that: The hand-cranked drive mechanism includes a hand crank (1) and a drive gear (2) arranged coaxially. The hand crank (1) and the drive gear (2) are rotatably connected to the support member, and the axis of rotation is the axis of the hand crank (1). The first transmission chain (3) is connected between the drive gear (2) and the transition gear (5).

5. The multi-functional folding tricycle according to any one of claims 1-4, characterized in that: The vehicle body includes a main body (9) and a telescopic part (10). The telescopic part (10) is slidably connected to the main body (9) to realize the length adjustment of the vehicle body. The front wheel part is hinged to the front end of the telescopic part (10).

6. The multi-functional folding tricycle according to claim 5, characterized in that: The lower end face of the main body (9) is provided with a placement groove for placing the front wheel part.

7. The multi-functional folding tricycle according to claim 5, characterized in that: The seat frame includes a guide tube (14), a support rod (13) is slidably connected inside the guide tube (14), one end of the support rod (13) is located inside the guide tube (14) and an elastic element (15) is provided between the support rod (13) and the bottom of the guide tube (14), the other end of the support rod (13) is rotatably connected to a strip seat plate (12), and a strip seat plate (12) fixing bolt is provided at the rotatable connection position between the strip seat plate (12) and the support rod (13); a handle is slidably connected to the strip seat plate (12).

8. The multi-functional folding tricycle according to claim 7, characterized in that: The seat frame is hinged to the main body (9), and the support adjustment mechanism is located between the main body (9) and the seat frame. The support adjustment mechanism includes a support adjustment member (11) and a positioning pin on the main body (9). One end of the support adjustment member (11) is hinged to the seat frame. The support adjustment member (11) has a plurality of positioning holes along its length, and the positioning pin can engage with one of the positioning holes.

9. The multi-functional folding tricycle according to claim 1, characterized in that: The shelf section includes a storage rack (16) that is hinged to the vehicle body, and the storage rack (16) can be fixed to the vehicle body.

10. The multi-functional folding tricycle according to claim 9, characterized in that: The vehicle body is provided with a support frame (19), which can be positioned and abutted against the shelf (16); A support rod (17) is provided between the support frame (19) and the shelf (16), one end of the support rod (17) is hinged to the shelf (16), and the other end of the support rod (17) can be positioned and abutted against the support frame (19); Or / and a leg (18) is rotatably connected to the support rod (17), one end of the leg (18) can be positioned and abutted against the support frame (19), and the other end of the leg (18) can abut against the ground or be suspended on the shelf (16).

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