Combined type power-assisted forward feeding device

Abstract

The combined type power-assisted forward conveying device comprises a main body frame, a battery bin, an extension frame and an auxiliary unit, the battery bin is of a cuboid structure, a battery is placed in the battery bin, one end of the battery bin is fixedly connected with the main body frame, and the auxiliary unit comprises an auxiliary bearing body, universal wheels and a connecting body; two universal wheels distributed at intervals are fixed to one end of the auxiliary bearing body, the end, away from the universal wheels, of the auxiliary bearing body is spliced with the battery bin through a connecting body and used for expanding the bearing area of the battery bin in the X-axis direction, and the other two opposite ends of the battery bin are each provided with an expanding frame capable of being unfolded or folded; the auxiliary units designed by the invention can be spliced with the battery compartment, so that a double-wheel single vehicle can be spliced into a four-wheel double vehicle as required, the expansion frame can be folded or unfolded, and the bearing area of the battery compartment is expanded, so that the problem that some articles with larger sizes are easy to incline and fall off due to small bearing area during transportation is solved, and the transportation speed of the articles is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of assisted transportation, and particularly to a combined assisted forward delivery device. Background Art

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

[0003] 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 larger-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.

[0004] Therefore, there is an urgent need for a combined assisted forward delivery device to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that the area borne by the battery compartment in the existing single-person assisted forward delivery device is limited, resulting in the problem that when transporting some larger-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.

[0006] For this purpose, the present invention provides a combined assisted forward delivery device, including a main frame, a battery compartment, an extension frame and an auxiliary unit. The battery compartment is of a cuboid structure and a battery is placed inside it. One end of the battery compartment is fixedly connected to the main frame. The auxiliary unit includes an auxiliary carrier, universal wheels and a connecting body. Two spaced-apart universal wheels are fixed at one end of the auxiliary carrier. The end of the auxiliary carrier away from the universal wheels is spliced with the battery compartment through the connecting body to expand the bearing area of the battery compartment along the X-axis direction. The other two opposite end portions of the battery compartment are respectively provided with expandable or foldable extension frames to be able to expand the bearing area of the battery compartment along the Y-axis direction when needed.

[0007] In the specific implementation manner of the above combined assisted forward delivery device, connecting frames are respectively fixed on the other two opposite side walls of the battery compartment. The inside of the connecting frame is of a hollow structure to form a slot. Two spaced-apart connecting bodies are respectively fixed at the end of the auxiliary carrier away from the universal wheels. The connecting bodies correspond to the slots one by one and can be inserted into the corresponding slots. When the connecting bodies are inserted into the slots, they are connected and locked with the connecting frames through a locking assembly.

[0008] In the specific implementation manner of the above-mentioned combined power-assisted front feeding device, at least two spaced-apart limiting holes are provided on the connecting body, and at least two spaced-apart jacks are provided on the outer side wall of the connecting frame. When the connecting body is inserted into the slot, the jacks correspond to the limiting holes one by one. The locking assembly includes a fixing plate, a fixing block, and a limiting block. The fixing block is fixed on the outer side wall of the connecting frame. The fixing plate is detachably and fixedly connected to the fixing block. The limiting blocks, which are the same in number as and correspond to the jacks one by one, are fixed on the side wall of the fixing plate facing the connecting frame. The limiting blocks can pass through the jacks and be inserted into the corresponding limiting holes to connect and lock the connecting body and the connecting frame.

[0009] In the specific implementation manner of the above-mentioned combined power-assisted front feeding device, the auxiliary carrier includes a top plate, a connecting plate, and two side plates. The connecting plate is in a U shape. One ends of the two side plates are respectively inserted into the inside of the connecting plate and fixedly connected. The top plate is fixed at the top of the area formed by the connecting plate and the side plates. The top plate and the side plates are fixedly connected by a plurality of reinforcing ribs. The connecting body is fixedly connected to the side plates.

[0010] In the specific implementation manner of the above-mentioned combined power-assisted front feeding device, the combined power-assisted front feeding device further includes support feet. The support feet are arranged at the bottom of the battery compartment. The support feet are arranged to be able to unfold relative to the battery compartment to support one end of the battery compartment away from the main frame or fold at the bottom of the battery compartment. When in the unfolded state, the support feet and the main frame jointly support the battery compartment so that its bearing surface can be in a horizontal placement state.

[0011] In the specific implementation manner of the above-mentioned combined power-assisted front feeding device, the support feet are in a U shape. Two spaced-apart first connection seats are fixed on the outer wall of the bottom of the battery compartment. The first connection seats are connected to the side rods on the support feet so that the support feet can unfold or fold.

[0012] In the specific implementation manner of the above-mentioned combined power-assisted front feeding device, strip-shaped holes are respectively provided on the side walls of the two side rods of the support feet. A notch penetrating the bottom wall is provided on one side wall of the first connection seat. An insertion opening that can communicate with the notch and into which the side rod of the support foot can be inserted is provided on the side wall of the first connection seat opposite to the notch. A connecting shaft is fixed in the notch. The strip-shaped holes on the side rods are sleeved on the corresponding connecting shafts. The support feet can move relative to the connecting shafts along the trajectories of the strip-shaped holes. During the movement, the end portions of the side rods are inserted into the insertion openings to reach the folded state or pulled out of the insertion openings to reach the unfolded state. The connecting line between the center point of the insertion opening and the center point of the connecting shaft is a downward diagonal line, so that the support feet reach the folded state in an upward inclined manner.

[0013] In the specific embodiment of the above-mentioned combined power-assisted front feeding device, the extension frame is in a U shape. The two side rods of the extension frame are respectively connected to the outer side wall of the connection frame through a second connection seat. The extension frame cooperates with the second connection seat to be able to fold on the top of the battery compartment or unfold to one side of the battery compartment.

[0014] In the specific embodiment of the above-mentioned combined power-assisted front feeding device, the second connection seat includes a seat body and a connection head. The seat body is fixed on the outer side wall of the connection frame. The connection head is in a U shape. The connection head is sleeved on the seat body and its top end is rotatably connected to the seat body. The end of the side rod of the extension frame is fixedly connected to the outer wall of the connection head away from the seat body. The extension frame is flipped to the top of the battery compartment through the connection head to reach the folded state. When the extension frame is in the unfolded state, the connection head abuts against the side wall of the seat body away from the battery compartment.

[0015] In the specific embodiment of the above-mentioned combined power-assisted front feeding device, the extension frame is in an upwardly inclined state relative to the battery compartment when unfolded.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The auxiliary unit designed in the present invention can be spliced with the battery compartment, enabling the two-wheeled bicycle to be spliced into a four-wheeled bicycle when needed. This not only expands the bearing area of the battery compartment, making it more convenient to use, but also changes the two wheels to four wheels, making the whole of the present invention more stable, flexible and convenient when transporting goods; the extension frame can be folded or unfolded. Thus, when it is necessary to expand the bearing area of the battery compartment in the Y-axis direction, only need to open the extension frame, and fold it back when not needed. 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, and improving the transportation speed of the items.

[0017] 2. By providing a support foot at the bottom of the battery compartment that can be unfolded and folded, the support foot can support the other end of the battery compartment after being unfolded. When the present invention is used as a single bicycle, the bearing surface of the battery compartment can be kept balanced, solving 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 whole power-assisted front feeding device more flexible and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following describes the preferred embodiments of the present invention with reference to the drawings, in which: Figure 1 is the overall structural schematic diagram of the combined power-assisted front feeding device provided by the present invention; Figure 2 is Figure 1Enlarged view of the structure of the middle battery compartment connected to the auxiliary unit; Figure 3 is Figure 1 Enlarged view of the structure of the middle battery compartment connected to the extension frame and the support feet; Figure 4 Schematic diagram of the structure of the auxiliary unit; Figure 5 Schematic diagram of the structure of the locking assembly; Figure 6 Schematic diagram of the structure of the auxiliary carrier; Figure 7 is Figure 3 Schematic diagram of the structure of the first connecting seat in the middle; Figure 8 is Figure 7 Enlarged view of the structure of the first connecting seat in the middle; Figure 9 Schematic diagram of the structure of the support feet.

[0019] List of reference numerals: 1, main frame; 2, battery compartment; 3, extension frame; 4, auxiliary carrier; 401, top plate; 402, side plate; 403, connecting plate; 5, support feet; 501, strip hole; 6, universal wheel; 7, first connecting seat; 701, socket; 702, notch; 8, locking assembly; 801, fixing plate; 802, fixing block; 803, limiting block; 9, connecting frame; 901, slot; 10, connecting body; 11, limiting hole; 12, second connecting seat; 1201, connecting head; 1202, seat body; 13, jack; 14, hub motor; 15, reinforcing rib. Detailed implementation manners

[0020] 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.

[0021] 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 accompanying 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 therefore should not be construed as a limitation of 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 meaning and should not be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "setting", and "connection" 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 components. 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.

[0023] The present invention relates to the technical field of assisted transportation, and particularly relates to a combined assisted forward delivery device. The purpose is to solve the problem that the area borne by the battery compartment in the existing single-person assisted forward delivery device is limited, resulting in easy tilting and dropping when transporting some larger-sized items due to the small bearing area, thus affecting the forward speed, that is, affecting the transportation speed of the items. For this purpose, the present invention provides a main frame, a battery compartment, an extension frame, and an auxiliary unit. The battery compartment is a cuboid structure for placing batteries. One end of the battery compartment is fixedly connected to the main frame. The auxiliary unit includes an auxiliary carrier, universal wheels, and a connecting body. Two spaced universal wheels are fixed at one end of the auxiliary carrier. The end of the auxiliary carrier away from the universal wheels is spliced with the battery compartment through the connecting body to expand the bearing area of the battery compartment along the X-axis direction. The other two opposite ends of the battery compartment are respectively provided with expandable or foldable extension frames to expand the bearing area of the battery compartment along the Y-axis direction when needed. The designed auxiliary unit of the present invention can be spliced with the battery compartment, so that the two-wheel bicycle can be spliced into a four-wheel double vehicle when needed. This not only expands the bearing area of the battery compartment and makes it more convenient to use, but also changes the two wheels to four wheels, making the whole of the present invention more stable when transporting goods.

[0024] Next, a detailed description of the combined assisted forward delivery device provided by the embodiments of the present invention will be given with reference to the accompanying drawings.

[0025] Refer to Figure 1-2 , the present invention provides a combined assisted forward delivery device, including a main frame 1, a battery compartment 2, an extension frame 3, and an auxiliary unit. The battery compartment 2 is a cuboid structure and a battery is placed inside it. One end of the battery compartment 2 is fixedly connected to the main frame 1. The auxiliary unit includes an auxiliary carrier 4, universal wheels 6, and a connecting body 10. Two spaced universal wheels 6 are fixed at one end of the auxiliary carrier 4. The end of the auxiliary carrier 4 away from the universal wheels 6 is spliced with the battery compartment 2 through the connecting body 10 to expand the bearing area of the battery compartment 2 along the X-axis direction. The other two opposite ends of the battery compartment 2 are respectively provided with expandable or foldable extension frames 3 to expand the bearing area of the battery compartment 2 along the Y-axis direction when needed.

[0026] Specifically, referring to Figure 4 and Figure 6 , the auxiliary carrier 4 includes a top plate 401, a connecting plate 403 and two side plates 402. The connecting plate 403 is U-shaped. One end of each of the two side plates 402 is inserted into the inner side of the connecting plate 403 and fixedly connected. The top plate 401 is fixed at the top of the area formed by the connecting plate 403 and the side plates 402. The top plate 401 and the side plates 402 are fixedly connected by a plurality of reinforcing ribs 15. The connecting body 10 is fixedly connected to the side plate 402, and the universal wheels 6 are fixed on the side plate 402. Through the support of the universal wheels 6 and the battery compartment 2 for the auxiliary carrier 4, the auxiliary carrier 4 can achieve a common balance with the battery compartment 2. In the state where the auxiliary unit is spliced with the battery compartment 2, the top surface of the auxiliary carrier 4 and the top surface of the battery compartment 2 together form a bearing surface.

[0027] Referring to Figure 1 , the main frame 1 includes an upper connecting frame 101, a folding and rotating joint 102, a connecting member 104, a lower connecting frame 103 and a shock-absorbing shaft 105. The upper connecting frame 101 is connected to the connecting member 104 through the folding and rotating joint 102. The connecting member 104 is fixedly connected to the lower connecting frame 103. The lower connecting frame 103 is fixedly connected to the battery compartment 2 through the shock-absorbing shaft 105. Both sides of the shock-absorbing shaft are connected to the hub motors 14. The folding and rotating joint 102 is used to enable the upper connecting frame 101 to rotate and fold relative to the lower connecting frame 103.

[0028] It should be noted that the structures of the folding and rotating 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 herein.

[0029] In one embodiment, referring to Figure 3-4 , connection frames 9 are respectively fixed on the other two opposite side walls of the battery compartment 2. The inside of the connection frame 9 is a hollow structure to form a slot 901. Two spaced-apart connecting bodies 10 are fixed at one end of the auxiliary carrier 4 away from the universal wheels 6. The connecting bodies 10 correspond to the slots 901 one by one and can be inserted into the corresponding slots 901. When the connecting bodies 10 are inserted into the slots 901, they are connected and locked with the connection frames 9 through the locking assembly 8.

[0030] In the above embodiment, preferably, referring to Figure 3-5, at least two limiting holes 11 are arranged at intervals on the connecting body 10, at least two inserting holes 13 are arranged at intervals on the outer side wall of the connecting frame 9, when the connecting body 10 is inserted into the inserting slot 901, the inserting holes 13 and the limiting holes 11 correspond to each other one by one, the locking assembly 8 includes a fixing plate 801, a fixing block 802 and a limiting block 803, the fixing block 802 is fixed on the outer side wall of the connecting frame 9, the fixing plate 801 is detachably and fixedly connected with the fixing block 802, the limiting blocks 803 with the same number as and corresponding to the inserting holes 13 one by one are fixed on the side wall of the fixing plate 801 facing the connecting frame 9, and the limiting blocks 803 can pass through the inserting holes 13 and be inserted into the corresponding limiting holes 11 to connect and lock the connecting body 10 and the connecting frame 9.

[0031] In the above embodiment, the number of the limiting holes 11 and the limiting blocks 803 is flexibly set according to the actual design situation, and the present application does not make specific limitations. After the connecting body 10 is inserted into the inserting slot 901, the limiting blocks 803 pass through the corresponding inserting holes 13 and are inserted into the limiting holes 11, and then the fixing plate 801 and the fixing block 802 are fixed. In this way, the connecting body 10 cannot be pulled out of the inserting slot 901 under the action of the limiting blocks 803, realizing the detachable connection between the connecting body 10 and the connecting frame 9. That is, the splicing function of the auxiliary unit and the battery compartment 2 is realized.

[0032] Regarding the connection structure between the fixing plate and the fixing block, the present application does not make specific limitations. Exemplarily, the fixing plate and the fixing block are detachably and fixedly connected by bolts, and an elastic sheet is arranged between the bolt head of the bolt and the fixing plate, which is beneficial to the stability of the bolt.

[0033] The auxiliary unit designed by the present invention can be spliced with the battery compartment 2, so that the two-wheel bicycle can be spliced into a four-wheel double bicycle when needed. In this way, not only the bearing area of the battery compartment 2 is expanded, making it more convenient to use, but also the two wheels are changed to four wheels, making the whole of the present invention more stable, flexible and convenient when transporting goods.

[0034] In one embodiment, refer to Figure 1 and Figure 7 , the combined power-assisted front feeding device further includes a support foot 5, the support foot 5 is arranged at the bottom of the battery compartment 2, the support foot 5 is arranged to be able to be unfolded relative to the battery compartment 2 to support one end of the battery compartment 2 away from the main body frame 1 or folded at the bottom of the battery compartment 2, and when the support foot 5 is in the unfolded state, it jointly supports the battery compartment 2 with the main body frame 1 so that its bearing surface can be in a horizontal placement state.

[0035] In the above embodiment, preferably, refer to Figure 7 and Figure 8 , the support foot 5 is in a U shape, two first connection seats 7 arranged at intervals are fixed on the outer wall of the bottom of the battery compartment 2, and the first connection seats 7 are connected with the side rods on the support foot 5 so that the support foot 5 can be unfolded or folded.

[0036] Specifically, see Figure 7-9 , the side walls of the two side rods of the support foot 5 are respectively provided with strip holes 501, a notch 702 penetrating the bottom wall is provided on one side wall of the first connection seat 7, a socket 701 which can be connected with the notch 702 and allows the side rod of the support foot 5 to be inserted is provided on the side wall of the first connection seat 7 opposite to the notch 702, a connecting shaft is fixed in the notch 702, the strip holes 501 on the side rod are sleeved on the corresponding connecting shaft, the support foot 5 can move along the track of the strip holes 501 relative to the connecting shaft, so that the end of the side rod is inserted into the socket 701 to reach the folded state or pulled out from the socket 701 to reach the unfolded state during the movement, and the line between the center point of the socket 701 and the center point of the connecting shaft is a downward oblique line, so that the support foot 5 reaches the folded state in an upward tilted manner. When the support foot 5 is in the unfolded state, the angle between the bottom surface of the battery compartment 2 is greater than 120°, so that the support is more stable.

[0037] like Figure 7 As shown, the support foot 5 is in a folded state. At this time, the support foot 5 is tilted upward relative to the X-axis line. At this time, the connecting shaft is located at the left end of the strip hole 501. When the support foot 5 needs to be unfolded, first pull the support foot 5 in an oblique upward direction to pull the side rod end of the support foot 5 out of the socket 701, and then the support foot 5 can be rotated along the connecting shaft until the support foot 5 cannot rotate. At this time, the support foot 5 is in an unfolded state and can support the battery compartment 2. In the present application, when the support foot 5 reaches the folded state, the support foot 5 tilts upward, so that the support foot 5 will not be detached from the socket 701 due to bumps and vibrations during transportation. It has the purpose of simple structure and convenient use.

[0038] By providing an unfoldable and foldable support foot 5 at the bottom of the battery compartment 2, the support foot 5 can support the other end of the battery compartment 2 after being unfolded. When the present invention is used as a bicycle, the bearing surface of the battery compartment 2 can be kept balanced, which solves the problem that the bearing surface of the existing battery compartment 2 is supported by only one end of the main frame 1, causing inconvenience in loading and unloading. The support foot 5 designed in the present invention makes the entire power-assisted forward delivery device more flexible and convenient to use.

[0039] In one embodiment, see Figure 3 The expansion rack 3 is U-shaped, and the two side rods of the expansion rack 3 are respectively connected to the outer wall of the connecting rack 9 through a second connecting seat 12. The expansion rack 3 cooperates with the second connecting seat 12 to be able to be folded at the top of the battery compartment 2 or unfolded to one side of the battery compartment 2.

[0040] In the above embodiment, preferably, the second connecting seat 12 includes a seat body 1202 and a connecting head 1201. The seat body 1202 is fixed on the outer side wall of the connecting frame 9. The connecting head 1201 is in a U-shaped form. The connecting head 1201 is sleeved on the seat body 1202 and its top end is rotatably connected to the seat body 1202, so that the connecting head 1201 can be turned outward relative to the seat body 1202. The end of the side rod of the extension frame 3 is fixedly connected to the outer wall of the connecting head 1201 away from the seat body 1202. The extension frame 3 is turned to the top of the battery compartment 2 through the connecting head 1201 to reach the folded state. When the extension frame 3 is in the unfolded state, the connecting head 1201 abuts against the side wall of the seat body 1202 away from the battery compartment 2.

[0041] In the above embodiment, preferably, the extension frame is in an upward inclined state relative to the battery compartment when unfolded. In this way, the two extension frames can play a certain role in wrapping the items placed on them when unfolded, which helps the items to be placed more firmly. The extension frame designed by the present invention has the advantages of simple overall structure, convenient use and low manufacturing cost.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than 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 make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A combined power-assisted forward delivery device, characterized in that: The utility model comprises a main frame, a battery compartment, an extension frame and an auxiliary unit. The battery compartment is a rectangular structure and a battery is placed inside the battery compartment. One end of the battery compartment is fixedly connected to the main frame. The auxiliary unit comprises an auxiliary carrier, a universal wheel and a connector. Two universal wheels distributed at intervals are fixed to one end of the auxiliary carrier. The end of the auxiliary carrier away from the universal wheel is spliced ​​with the battery compartment through a connector to expand the bearing area of ​​the battery compartment along the X-axis direction. The other two opposite ends of the battery compartment are respectively provided with expansion frames that can be unfolded or folded so as to expand the bearing area of ​​the battery compartment along the Y-axis direction when needed.

2. The combined power-assisted forward delivery device according to claim 1, characterized in that: A connecting frame is fixed on the other two opposite side walls of the battery compartment, and the interior of the connecting frame is a hollow structure to form a slot. Two spaced-apart connecting bodies are fixed on the end of the auxiliary carrier away from the universal wheel, and the connecting bodies correspond to the slots one by one and can be inserted into the corresponding slots. When the connecting bodies are inserted into the slots, they are connected and locked to the connecting frame through a locking assembly.

3. The combined power-assisted forward delivery device according to claim 2, characterized in that: The connector is provided with at least two spaced-apart limiting holes, and the outer side wall of the connecting frame is provided with at least two spaced-apart insertion holes. When the connector is inserted into the slot, the insertion holes correspond one-to-one with the limiting holes. The locking assembly comprises a fixing plate, a fixing block and a limiting block. The fixing block is fixed to the outer side wall of the connecting frame, and the fixing plate and the fixing block are detachably fixedly connected. The fixing plate is fixed with limiting blocks having the same number as the insertion holes and corresponding one-to-one on the side wall of the connecting frame facing the connecting frame. The limiting blocks can be inserted into the corresponding limiting holes through the insertion holes to lock the connector and the connecting frame.

4. The combined power-assisted forward delivery device according to claim 1, characterized in that: The auxiliary carrier includes a top plate, a connecting plate and two side plates, the connecting plate is U-shaped, one end of the two side plates are respectively inserted into the inner side of the connecting plate and fixedly connected, the top plate is fixed to the top of the area formed by the connecting plate and the side plates, the top plate and the side plates are fixedly connected by multiple reinforcing ribs, and the connector is fixedly connected to the side plates.

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

6. The combined power-assisted forward delivery device according to claim 5, characterized in that: The support foot is in a U-shape, and two first connection seats distributed at intervals are fixed on the bottom outer wall of the battery compartment. The first connection seats are connected to the side rods on the support foot so that the support foot can be unfolded or folded.

7. The combined power-assisted forward delivery device according to claim 6, characterized in that: The side walls of the two side rods of the supporting foot are respectively provided with strip holes, a side wall of the first connecting seat is provided with a notch that penetrates the bottom wall, and the side wall of the first connecting seat opposite to the notch is provided with a socket that can be connected with the notch and allows the side rod of the supporting foot to be inserted, a connecting shaft is fixed in the notch, the strip holes on the side rods are sleeved on the corresponding connecting shaft, and the supporting foot can move along the trajectory of the strip holes relative to the connecting shaft, so that the end of the side rod can be inserted into the socket to reach a folded state or pulled out of the socket to reach an unfolded state during the movement, and the line connecting the center point of the socket and the center point of the connecting shaft is a downward oblique line, so that the supporting foot can reach a folded state in an upward tilted manner.

8. The combined power-assisted forward delivery device according to claim 1, characterized in that: The expansion rack is U-shaped, and the two side rods of the expansion rack are respectively connected to the outer side wall of the connecting rack through a second connecting seat. The expansion rack cooperates with the second connecting seat so that it can be folded at the top of the battery compartment or unfolded to one side of the battery compartment.

9. The combined power-assisted forward delivery device according to claim 8, characterized in that: The second connecting seat includes a seat body and a connecting head, the seat body is fixed on the outer side wall of the connecting frame, the connecting head is U-shaped, the connecting head is sleeved on the seat body and the top end of the connecting head is rotatably connected to the seat body, the end of the side rod of the extension frame is fixedly connected to the outer wall of the seat body away from the connecting head, the extension frame is flipped to the top of the battery compartment through the connecting head to achieve a folded state, and when the extension frame is in the unfolded state, the connecting head is against the side wall of the seat body away from the battery compartment.

10. The combined power-assisted forward delivery device according to claim 1, characterized in that: When the expansion rack is unfolded, it is in an upwardly tilted state relative to the battery compartment.

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