Power-assisted forward feeding device

Abstract

The invention discloses a power-assisted forward conveying device which comprises a main body frame, a battery bin, supporting legs and expansion frames, the battery bin is of a cuboid structure, one end of the battery bin is fixedly connected with the main body frame, and the other three ends of the battery bin are provided with the expansion frames capable of being unfolded or folded so that the bearing area of the battery bin can be enlarged when needed; the supporting legs are connected with one end, far away from the main body frame, of the battery compartment, can be unfolded relative to the battery compartment to support one end, far away from the main body frame, of the battery compartment or folded at the bottom of the battery compartment, and support the battery compartment together with the main body frame in an unfolded state so that the bearing surface of the battery compartment can be in a horizontal placement state; through the design, the bearing area of the battery compartment is expanded, so that the problem that articles are easy to incline and fall off due to small bearing area is solved, the bearing surface of the battery compartment can be kept balanced through the design of the supporting legs, and the problem that loading and unloading are inconvenient due to inclination caused by the fact that the bearing surface of an existing battery compartment is only supported by one end of the main body frame is solved.

Description

Technical Field

[0001] The invention relates to the technical field of power-assisted transportation, and in particular to a power-assisted forward delivery device. Background Art

[0002] With the development of science and technology, in order to save physical strength in some situations where it is impossible to transport items with the help of vehicles or other tools and a single person is required to transport items (such as some earthquake rescue sites, areas with complex terrain, and areas with damaged road conditions), a single-person power-assisted forward delivery device has been developed. The traction of the power-assisted forward delivery device itself is used to cooperate with the walking of a single person, and the items are placed on the power-assisted forward delivery device to transport the items to the designated location.

[0003] However, the existing single-person power-assisted forward delivery device has a limited carrying area for the battery compartment, which results in the problem of being easily tilted and falling when transporting some large-sized items due to the small carrying area, thereby affecting the forward speed, that is, the transportation speed of the items. In addition, since the existing single-person power-assisted forward delivery device has only two side-by-side wheels, the carrying surface of the battery compartment is in a tilted state when parked. When loading or unloading some items that require the carrying surface of the battery compartment to remain horizontal, another person is required to assist, which is inflexible to use.

[0004] Therefore, a new power-assisted forward delivery device is urgently needed to solve the above-mentioned technical problems. Summary of the invention

[0005] The present invention aims to solve the above-mentioned technical problems, that is, to solve the following problems: first, the bearing area of ​​the battery compartment in the existing single-person power-assisted forward delivery device is limited, which leads to the problem that some larger items are easily tilted and fallen due to the small bearing area when transporting, thereby affecting the forward speed, that is, affecting the transportation speed of the items; second, since the existing single-person power-assisted forward delivery device has only two side-by-side wheels, the bearing surface of the battery compartment is in a tilted state when parked. For some loading or unloading of items that require the bearing surface of the battery compartment to remain horizontal, another person is required to assist, which is inflexible to use.

[0006] To this end, the present invention provides a power-assisted forward delivery device, including a main frame, a battery compartment and an expansion rack. The battery compartment is a rectangular structure, one end of the battery compartment is fixedly connected to the main frame, and the other three ends of the battery compartment are provided with expansion racks that can be unfolded or retracted to expand the load-bearing area of ​​the battery compartment when needed.

[0007] In the specific embodiment of the above-mentioned power-assisted front feeding device, the extension frame provided at one end of the battery compartment opposite to the main body frame is the first extension frame. Connecting frames are respectively fixed on the other two opposite side walls of the battery compartment. The first extension frame is connected to the two connecting frames and can perform telescopic movement relative to the battery compartment to realize the expansion or retraction of the first extension frame. The extension frames provided at the other two opposite ends of the battery compartment are both second extension frames. The second extension frame is connected to the adjacent connecting frame and can be folded to the bottom of the battery compartment or expanded to extend the bearing surface of the battery compartment.

[0008] In the specific embodiment of the above-mentioned power-assisted front feeding device, the first extension frame is in a U shape. The two side rods of the first extension frame are respectively inserted into different connecting frames and can move horizontally relative to them to realize the expansion or retraction of the first extension frame relative to the battery compartment. A locking component is fixed at one end of each connecting frame away from the main body frame. The locking component is set to be able to lock the expanded state or retracted state of the first extension frame so as not to move.

[0009] In the specific embodiment of the above-mentioned power-assisted front feeding device, the locking component includes a first fixed seat, a limit pin and an operating rod. The first fixed seat is fixedly connected to the corresponding connecting frame. A groove is opened at the bottom end of the first fixed seat. The side wall of the groove away from the connecting frame is an open structure. The operating rod includes a driving block and an operating handle. The driving block is located in the groove and is rotatably connected to the first fixed seat. The bottom end of the operating handle is inserted into the groove from the opening part and is fixedly connected to the driving block. The limit pin is located in the groove and a spring is sleeved on it. The bottom end of the limit pin cooperates with the driving block so that the limit pin can move up and down under the combined action of the spring and the driving block to penetrate the first fixed seat and insert into the first extension frame or be pulled out of the first extension frame during the rotation of the driving block driven by the operating handle.

[0010] In the specific embodiment of the above-mentioned power-assisted front feeding device, a transition groove capable of inserting the limit pin is provided on the top surface of the driving block. Slide openings communicating with the transition groove are provided on the front and rear walls of the driving block. The top surface inside the slide opening is an arc-shaped slideway surface and the distance from the rotation fulcrum of the driving block gradually increases in the clockwise direction. A sliding column is fixed at the bottom end of the limit pin. The sliding column is located in the transition groove and its two ends are respectively inserted into the corresponding slide openings and are in a fitting state with the slideway surface under the action of the spring, so that the sliding column drives the limit pin to move up and down under the action of the slideway surface track during the rotation of the driving block.

[0011] In the specific implementation manner of the above-mentioned power-assisted forward feeding device, the second extension frame is in a U shape. Two end portions of the second extension frame are respectively connected to the connecting frame through a 90° folding locking member. The 90° folding locking member includes a U-shaped second fixing seat, a flipping block, and a first positioning pin. The second fixing seat is fixed on the connecting frame. The flipping block is located inside the second fixing seat, one end of which is rotatably connected to the second fixing seat, and the other end is fixedly connected to an end portion of a side rod of the second extension frame. The second extension frame can be folded at the bottom of the battery compartment or unfolded to expand the bearing surface of the battery compartment with the flipping movement of the flipping block, and is locked on the second fixing seat through the first positioning pin.

[0012] In the specific implementation manner of the above-mentioned power-assisted forward feeding device, the power-assisted forward feeding device further includes a support foot, which is connected to an end of the battery compartment away from the main body frame. The support foot is arranged to be able to unfold relative to the battery compartment to support the end of the battery compartment away from the main body frame or fold at the bottom of the battery compartment, and jointly support the battery compartment with the main body frame in the unfolded state so that its bearing surface can be in a horizontal placement state.

[0013] In the specific implementation manner of the above-mentioned power-assisted forward feeding device, in the unfolded state, the included angle between the support foot and the bottom wall surface of the battery compartment is greater than or equal to 120°.

[0014] In the specific implementation manner of the above-mentioned power-assisted forward feeding device, two third fixing seats distributed in parallel are fixed on the side wall of the battery compartment away from the main body frame. A rotating block is rotatably connected to each third fixing seat. The support foot is in a U shape. Two side rod end portions of the support foot are respectively fixedly connected to the rotating blocks on one third fixing seat. The rotating blocks are perpendicular to the side rods of the support foot. A limiting block is integrally formed on the rotating block. When the limiting block rotates and abuts against the third fixing seat driven by the rotating block, the support foot is in the unfolded state. When the support foot is folded at the bottom of the battery compartment, it is locked on the third fixing seat through a second positioning pin.

[0015] In the specific implementation manner of the above-mentioned power-assisted forward feeding device, the power-assisted forward feeding device further includes a control handle and a control system. The control system is installed on the main body frame. The control handle is used to send a movement instruction of the power-assisted forward feeding device to the control system. The control handle includes a handle shell, a speed control operation end, a downhill assistance operation end, a forward and backward switching end, and a power display lamp. The speed control operation end is installed at the top end of the handle shell. The downhill assistance operation end, the forward and backward switching end, and the power display lamp are sequentially installed in the handle shell from top to bottom and extend to the outside from the side wall of the mobile phone case.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The first extension rack and the second extension rack are designed at the edge of the battery compartment. The first extension rack and the second extension rack can be unfolded or retracted. In this way, when it is necessary to expand the bearing area of the battery compartment, only need to open the extension rack, and when it is not needed, fold it back. Through this design, the bearing area of the battery compartment is expanded, thus solving the problem that some larger-sized items are prone to tilt and fall due to the small bearing area during transportation, and improving the transportation speed of the items.

[0017] 2. By setting a support foot that can be unfolded and folded at one end of the battery compartment far from the main frame, the support foot can support the other end of the battery compartment after being unfolded, which can keep the bearing surface of the battery compartment balanced, and solves the problem that the bearing surface of the existing battery compartment is only supported at one end of the main frame, resulting in tilt and inconvenient loading and unloading. The support foot designed in the present invention makes the entire power-assisted forward feeding device more flexible and convenient to use.

[0018] 3. The speed control operation end is set at the top of the control handle, so that the speed can be controlled by the thumb, making the operation more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings: Figure 1 is a schematic structural diagram of the power-assisted forward feeding device provided by the present invention; Figure 2 is Figure 1 an enlarged structural view of the connection between the battery compartment and the extension rack in; Figure 3 is Figure 1 an enlarged structural view of the connection between the battery compartment and the extension rack from another angle in; Figure 4 is Figure 3 a schematic structural diagram of the locking component in; Figure 5 is a schematic structural diagram of the control handle; Figure 6 is Figure 5 a schematic structural view of the inside of the handle housing in; Figure 7 is a schematic structural diagram of the extension rack and the support foot of the present invention in the unfolded state.

[0020] LIST OF REFERENCE NUMERALS 1. Main frame; 101. Upper connecting frame; 102. Folding and rotating joint; 103. Lower connecting frame; 104. Connecting piece; 105. Shock-absorbing shaft; 2. Battery compartment; 3. First extension frame; 4. Second extension frame; 5. Support leg; 6. Second fixing seat; 7. First positioning pin; 8. Fourth jack; 9. Third jack; 10. Operating handle; 11. First fixing seat; 12. Third fixing seat; 13. Second positioning pin; 14. Flipping block; 15. Rotating block; 16. Limiting block; 17. Limiting pin; 18. Spring; 19. Driving block; 20. Slideway opening; 21. Sliding column; 22. Disc; 23. Transition groove; 24. Control handle; 241. Handle shell; 242. Speed control operating end; 243. Downhill assist operating end; 244. Forward and backward switching end; 245. Battery level indicator light. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In addition, the use of the terms "first", "second", etc. to limit the components is only for the convenience of distinguishing the above components. Without further statement, the above terms have no special meanings and cannot be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "set", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] The present invention relates to the technical field of assisted transportation, and particularly to an assisted forward delivery device. The purpose is to solve the following problems: First, in the existing single-person assisted forward delivery device, the area borne by the battery compartment is limited, resulting in the problem that when transporting some large-sized items, it is easy to tilt and fall due to the small bearing area, thus affecting the forward speed, that is, affecting the transportation speed of the items; Second, since the existing single-person assisted forward delivery device only has two side-by-side wheels, when parked, the bearing surface of the battery compartment is in an inclined state. For some items that require the bearing surface of the battery compartment to be kept horizontal for loading or unloading, another person is needed to assist, which is not flexible to use. For this purpose, the assisted forward delivery device provided by the present invention includes a main body frame, a battery compartment, an extension frame, and support feet. The battery compartment is a cuboid structure. One end of the battery compartment is fixedly connected to the main body frame, and the other three ends of the battery compartment are all provided with extension frames that can be unfolded or retracted to expand the bearing area of the battery compartment when needed. The support feet are connected to the end of the battery compartment away from the main body frame, and the support feet are arranged to be able to expand relative to the battery compartment to support the end of the battery compartment away from the main body frame or fold at the bottom of the battery compartment. The present invention expands the bearing area of the battery compartment by providing an extension frame on the battery compartment, solving the problem that when transporting some large-sized items, it is easy to tilt and fall due to the small bearing area; through the design of the support feet, when unfolded, it can support the battery compartment to keep the bearing surface balanced, making it more convenient to use.

[0025] Next, the assisted forward delivery device provided by the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0026] Refer to Figures 1-3 , the present invention provides an assisted forward delivery device, including a main body frame 1, a battery compartment 2, and an extension frame. The battery compartment 2 is a cuboid structure. One end of the battery compartment 2 is fixedly connected to the main body frame 1, and the other three ends of the battery compartment 2 are all provided with extension frames that can be unfolded or retracted to expand the bearing area of the battery compartment 2 when needed.

[0027] In the above embodiment, preferably, refer to Figures 2-3 , the extension frame provided at the end of the battery compartment 2 opposite to the main body frame 1 is the first extension frame 3. Connecting frames are respectively fixed on the other two opposite side walls of the battery compartment 2. The first extension frame 3 is connected to the two connecting frames and can move telescopically relative to the battery compartment 2 to realize the unfolding or retracting of the first extension frame 3. The extension frames provided at the other two opposite ends of the battery compartment 2 are both the second extension frames 4. The second extension frames 4 are connected to the adjacent connecting frames and can be folded to the bottom of the battery compartment 2 or unfolded to expand the bearing surface of the battery compartment.

[0028] In a specific embodiment, refer to Figures 3-4 and Figure 7, the first extension frame 3 is U-shaped, and the interior of the connecting frame is a hollow structure. The two side rods of the first extension frame 3 are respectively inserted into different connecting frames and can move horizontally relative to them to realize the expansion or retraction of the first extension frame 3 relative to the battery compartment 2. A locking component is fixed at one end of each connecting frame away from the main frame 1, and the locking component is set to be able to lock the expanded state or retracted state of the first extension frame 3 so as not to move.

[0029] In the above embodiment, preferably, the locking component includes a first fixed seat 11, a limit pin 17 and an operating rod. The first fixed seat 11 is fixedly connected to the corresponding connecting frame. A groove is formed at the bottom end of the first fixed seat 11, and the side wall of the groove away from the connecting frame is an open structure. The operating rod includes a driving block 19 and an operating handle 10. The driving block 19 is located in the groove and is rotatably connected to the first fixed seat 11. The bottom end of the operating handle 10 is inserted into the groove from the opening part and is fixedly connected to the driving block 19. The limit pin 17 is located in the groove and a spring 18 is sleeved on it. The bottom end of the limit pin 17 cooperates with the driving block 19 so that the limit pin 17 can move up and down under the combined action of the spring 18 and the driving block 19 to insert into the first extension frame 3 or be pulled out of the first extension frame 3 through the first fixed seat 11.

[0030] Specifically, refer to Figure 4 , the driving block 19 and the operating handle 10 are of an integral structure. A transition groove 23 for inserting the limit pin 17 is provided on the top surface of the driving block 19. Slide openings 20 communicating with the transition groove 23 are provided on the front and rear walls of the driving block 19. The top surface inside the slide openings 20 is an arc-shaped slide surface, and the distance between the slide surface and the rotation fulcrum of the driving block 19 gradually increases in the clockwise direction. A sliding column 21 is fixed to the bottom end of the limit pin 17. The sliding column 21 is located in the transition groove 23 and its two ends are respectively inserted into the corresponding slide openings 20 and are in a fitting state with the slide surface under the action of the spring 18, so that the sliding column 21 drives the limit pin 17 to move up and down under the action of the slide surface track during the rotation of the driving block 19.

[0031] More specifically, first jacks corresponding to the limit pin 17 are provided at the bottom of the first extension frame 3 in the expanded and retracted states respectively. The top end of the limit pin 17 is inserted into different first jacks for locking at different positions. When the limit pin 17 is pulled out of the first jack, the first extension frame 3 can move along the battery compartment 2. The top surface of the driving block 19 is an arc-shaped surface, and the distance between the arc-shaped surface and the rotation fulcrum of the driving block 19 also gradually increases in the clockwise direction.

[0032] Refer to Figure 4, two springs 18 are provided and arranged along the axial direction of the limit pin 17. A disc 22 is fixed on the limit pin 17. A first spring 18 is sleeved on the limit pin 17 between the disc 22 and the top of the groove, and a second spring 18 is sleeved on the limit pin 17 between the disc 22 and the top of the driving block 19. The second spring 18 is in a compressed state. The top of the first spring 18 is fixedly connected to the top of the groove, the bottom of the first spring 18 is fixedly connected to the disc 22, and the first spring 18 is in a stretched state.

[0033] As Figure 4 shown, an external force in the clockwise direction is applied to the operating handle 10, the driving block 19 rotates clockwise, and during the rotation, the limit pin 17 is gradually pulled down, so that the limit pin 17 is pulled out from the first jack of the first extension frame 3, so that the first extension frame 3 can move horizontally. At this time, the first spring 18 is stretched and the compression force of the second spring 18 is reduced. When it moves to the corresponding position, the operating handle 10 is rotated in the reverse direction, the second spring 18 is compressed, and the first spring 18 returns to its original position, both driving the limit pin 17 to move upward to insert into the corresponding first jack to achieve locking.

[0034] In one embodiment, referring to Figure 3 and Figure 7 , the second extension frame 4 is in a U shape. The two ends of the second extension frame 4 are respectively connected to the connecting frame through a 90° folding locking member. The 90° folding locking member includes a U-shaped second fixed seat 6, a flipping block 14 and a first positioning pin 7. The second fixed seat 6 is fixed on the connecting frame. The flipping block 14 is located inside the second fixed seat 6 and one end thereof is rotatably connected to the second fixed seat 6, and the other end is fixedly connected to the end of a side rod of the second extension frame 4. The second extension frame can reach the bottom of the battery compartment to be folded or unfolded to expand the bearing surface of the battery compartment with the flipping movement of the flipping block, and is locked on the second fixed seat through the first positioning pin. That is, the second extension frame 4 is locked at different positions on the second fixed seat 6 to achieve being kept folded at the bottom of the battery compartment 2 and unfolded to expand the bearing surface of the battery compartment 2. Regarding the angle between the flipping block 14 and the side rod of the second extension frame 4, without departing from the basic principle of the present invention, the present application does not make specific limitations. Exemplarily, it can be 90°, that is, the flipping block is perpendicular to the side rod of the second extension frame 4, as Figure 7 shown.

[0035] Specifically, a second jack is provided at the top end of the side wall of the second fixing seat 6, a third jack 9 is provided at the bottom end of the side wall of the second fixing seat 6, and a fourth jack 8 is provided on the turning block 14. The first positioning pin 7 is passed through the second jack and the fourth jack 8 to lock the position of the turning block 14. At this time, the second extension frame 4 is in the unfolded state. The first positioning pin 7 is passed through the third jack 9 and the fourth jack 8 to lock the position of the turning block 14. At this time, the second extension frame 4 is located at the bottom of the battery compartment 2, that is, in the folded and retracted state.

[0036] In this application, a first extension frame 3 and a second extension frame 4 are designed at the edge part of the battery compartment 2. The first extension frame 3 and the second extension frame 4 can be unfolded or retracted. In this way, when it is necessary to expand the bearing area of the battery compartment 2, only need to open the extension frame, and when it is not needed, fold it back. Through this design, the bearing area of the battery compartment 2 is expanded, thus solving the problem that some larger-sized items are prone to tilt and fall due to the small bearing area during transportation, and improving the transportation speed of the items.

[0037] In one embodiment, referring to Figures 2-3 , the assisting front feeding device further includes a supporting foot 5. The supporting foot 5 is connected to the end of the battery compartment 2 away from the main body frame 1. The supporting foot 5 is arranged to be able to expand relative to the battery compartment 2 to support the end of the battery compartment 2 away from the main body frame 1 or fold at the bottom of the battery compartment 2, and in the unfolded state, jointly support the battery compartment with the main body frame so that its bearing surface can be in a horizontal placement state.

[0038] Specifically, two third fixing seats 12 distributed side by side are fixed on the side wall of the battery compartment 2 away from the main body frame 1. A rotating block 15 is rotatably connected to each third fixing seat 12. The supporting foot 5 is in a U-shaped shape. The two side rod ends of the supporting foot 5 are respectively fixed to the rotating blocks 15 on a third fixing seat 12. The rotating block 15 is perpendicular to the side rod of the supporting foot 5. A limiting block 16 is integrally formed on the rotating block 15. When the rotating block 15 drives the limiting block 16 to rotate and abut against the third fixing seat 12, the supporting foot 5 is in the unfolded state. When the supporting foot 5 is folded at the bottom of the battery compartment 2, it is locked to the third fixing seat 12 by a second positioning pin 13.

[0039] Specifically, a fifth jack is provided at the bottom of the side wall of the third fixing seat 12, and a sixth jack is provided on the rotating block 15. When the supporting foot 5 is folded at the bottom of the battery compartment 2, the second positioning pin 13 passes through the fifth jack and the sixth jack to achieve position locking.

[0040] In the above embodiment, preferably, in the unfolded state, the included angle between the supporting foot 5 and the bottom wall surface of the battery compartment 2 is greater than or equal to 120°. As Figure 7 shown, a schematic structural diagram when the first extension frame 3, the second extension frame 4 and the supporting foot 5 are all in the unfolded state.

[0041] In the present application, a support leg 5 that can be unfolded and folded is provided at one end of the battery compartment 2 away from the main body frame 1. When the support leg 5 is unfolded to support the battery compartment 2, the bearing surface of the battery compartment 2 can be kept balanced, solving the problem that the bearing surface of the existing battery compartment 2 is only supported at one end of the main body frame 1, resulting in inclination and inconvenient loading and unloading. The support leg 5 designed in the present invention makes the whole power-assisted forward feeding device more flexible and convenient to use.

[0042] In one embodiment, referring to Figures 5-6 , the power-assisted forward feeding device further includes a control handle 24 and a control system. The control system is installed on the main body frame. The control handle 24 is used to send a motion instruction of the power-assisted forward feeding device to the control system. The control handle 24 includes a handle shell 241, a speed control operation end 242, a downhill assistance operation end 243, a forward and backward switching end 244, and a power display lamp 245. The speed control operation end 242 is installed at the top end of the handle shell 241. The downhill assistance operation end 243, the forward and backward switching end 244, and the power display lamp 245 are sequentially installed in the handle shell 241 from top to bottom and extend to the outside from the side wall of the mobile phone case. The control handle and the control system can be connected wirelessly or wiredly to realize sending various motion instructions for the power-assisted forward feeding device to move through the control handle. A battery is placed in the battery compartment 2 to provide power to each electrical component, such as the control system.

[0043] In the above embodiment, the speed control operation end 242 is arranged at the top end of the control handle 24, so that the speed can be controlled by the thumb, making the operation more stable.

[0044] Referring to Figure 1 , the main body frame 1 includes an upper connection frame 101, a folding rotary joint 102, a connecting member 104, a lower connection frame 103, and a shock-absorbing shaft 105. The upper connection frame 101 is connected to the connecting member 104 through the folding rotary joint 102. The connecting member 104 is fixedly connected to the lower connection frame 103. The control system is arranged on the connecting member. The lower connection frame 103 is fixedly connected to the battery compartment 2 through the shock-absorbing shaft 105. Hub motors are connected to both sides of the shock-absorbing shaft 105. The hub motors are connected to the control system. The folding rotary joint 102 is used to enable the upper connection frame 101 to rotate and fold relative to the lower connection frame 103. A cavity is provided inside the connecting member, and the control system can be installed inside the connecting member. When the control handle 242 is a wired handle, an interface for connecting the connecting line of the control handle 242 is also provided at the connecting member 104.

[0045] It should be noted that the structures of the folding rotary joint 102 and the shock-absorbing shaft 105 are prior art to those skilled in the art. Therefore, they will not be described in detail here.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power-assisted forward delivery device, characterized in that: It includes a main frame, a battery compartment and an expansion rack. The battery compartment is a rectangular structure. One end of the battery compartment is fixedly connected to the main frame, and the other three ends of the battery compartment are provided with expansion racks that can be unfolded or retracted to expand the bearing area of ​​the battery compartment when needed.

2. The power-assisted forward delivery device according to claim 1, characterized in that: The expansion rack arranged on the end of the battery compartment opposite to the main frame is a first expansion rack, and connecting racks are respectively fixed on the other two opposite side walls of the battery compartment, the first expansion rack is connected to the two connecting racks and can perform telescopic movement relative to the battery compartment to realize the expansion or retraction of the first expansion rack, and the expansion racks arranged at the other two opposite ends of the battery compartment are both second expansion racks, the second expansion racks are connected to adjacent connecting racks and can be folded to the bottom of the battery compartment or unfolded to expand the bearing surface of the battery compartment.

3. The power-assisted forward delivery device according to claim 2, characterized in that: The first expansion rack is U-shaped, and the two side rods of the first expansion rack are respectively inserted into different connecting racks and can be horizontally moved relative to each other to realize the expansion or retraction of the first expansion rack relative to the battery compartment. A locking component is fixed at one end of each connecting rack away from the main rack, and the locking component is configured to lock the expanded state or retracted state of the first expansion rack so that it does not move.

4. The power-assisted forward delivery device according to claim 3, characterized in that: The locking assembly includes a first fixed seat, a limit pin and an operating rod, the first fixed seat is fixedly connected to the corresponding connecting frame, a groove is opened at the bottom end of the first fixed seat, and the groove is an open structure away from the side wall of the connecting frame, the operating rod includes a driving block and an operating handle, the driving block is located in the groove and is rotatably connected to the first fixed seat, the bottom end of the operating handle is inserted into the groove from the opening and is fixedly connected to the driving block, the limit pin is located in the groove and is sleeved with a spring, the bottom end of the limit pin cooperates with the driving block so that during the process of the operating handle driving the driving block to rotate, the limit pin can move up and down under the joint action of the spring and the driving block to pass through the first fixed seat and be inserted into the first extension frame or be pulled out of the first extension frame.

5. The power-assisted forward delivery device according to claim 4, characterized in that: The top surface of the driving block is provided with a transition groove for inserting the limit pin, and the front and rear walls of the driving block are provided with slide openings connected to the transition groove. The top surface in the slide opening is an arc-shaped slide surface and the distance between the top surface and the rotation fulcrum of the driving block gradually increases in the clockwise direction. A sliding column is fixed to the bottom end of the limit pin, and the sliding column is located in the transition groove and its two ends are respectively inserted into the corresponding slide openings and are in a fit state with the slide surface under the action of the spring, so that the sliding column drives the limit pin to move up and down under the action of the slide surface trajectory during the rotation of the driving block.

6. The power-assisted forward delivery device according to claim 2, characterized in that: The second expansion frame is U-shaped, and the two ends of the second expansion frame are respectively connected to the connecting frame by a 90° folding locking piece, and the 90° folding locking piece includes a U-shaped second fixing seat, a flip block and a first positioning pin, the second fixing seat is fixed to the connecting frame, the flip block is located on the inner side of the second fixing seat and one end thereof is rotatably connected to the second fixing seat, and the other end is fixedly connected to an end of a side rod of the second expansion frame, and the second expansion frame can be folded at the bottom of the battery compartment or unfolded to expand the bearing surface of the battery compartment with the flipping movement of the flip block, and is locked to the second fixing seat by the first positioning pin.

7. The power-assisted forward delivery device according to claim 1, characterized in that: The power-assisted forward delivery device also includes a supporting foot, which is connected to one end of the battery compartment away from the main frame. The supporting foot is configured to be able to be unfolded relative to the battery compartment to support the end of the battery compartment away from the main frame or to be folded at the bottom of the battery compartment, and in the unfolded state, it supports the battery compartment together with the main frame so that its bearing surface can be in a horizontal placement state.

8. The power-assisted forward delivery device according to claim 7, characterized in that: In the unfolded state, the angle between the support leg and the bottom wall of the battery compartment is greater than or equal to 120°.

9. The power-assisted forward delivery device according to claim 7, characterized in that: Two third fixing seats distributed in parallel are fixed on the side wall of the battery compartment away from the main frame, and each of the third fixing seats is rotatably connected to a rotating block, and the supporting foot is in a U-shape, and the two side rod ends of the supporting foot are respectively fixedly connected to a rotating block on the third fixing seat, and the rotating block and the side rod of the supporting foot are in a vertical state, and a limiting block is integrally formed on the rotating block. When the limiting block rotates driven by the rotating block to abut against the third fixing seat, the supporting foot is in an unfolded state, and when the supporting foot is folded at the bottom of the battery compartment, it is locked to the third fixing seat by a second positioning pin.

10. The power-assisted forward delivery device according to claim 1, characterized in that: The power-assisted forward delivery device also includes a control handle and a control system, wherein the control system is installed on the main frame, and the control handle is used to send movement instructions of the power-assisted forward delivery device to the control system. The control handle includes a handle shell, a speed control operating end, a downhill auxiliary operating end, a forward and backward switching end, and a power display light. The speed control operating end is installed on the top of the handle shell, and the downhill auxiliary operating end, the forward and backward switching end, and the power display light are installed in the handle shell in sequence from top to bottom and extend from the side wall of the mobile phone shell to the outside.

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