Electric trolley

Abstract

The utility model discloses an electric trolley which comprises a frame and an operating rod connected with the frame, the frame comprises a front support, a rear support, two side supports and a bottom support, the two side supports and the bottom support are arranged between the front support and the rear support, and driven wheel sets are arranged on the two sides of the bottom of the front support respectively. Driving wheel sets are arranged on the two sides of the bottom of the rear support respectively, the driving wheel sets are suitable for independently rotating to drive the electric trolley, and the rear support is further provided with an anti-torsion piece used for preventing the driving wheel sets from asynchronously rotating to cause torsion of the frame. The anti-torsion pieces can resist shearing force generated by asynchronous rotation of the driving wheel sets, deformation and even breakage of the frame are avoided, the overall stability of the frame is improved, the anti-torsion pieces can increase external force needed for folding the bottom support, the frame is kept in an unfolded state in the using process, and the service life of the frame is prolonged. And the frame is prevented from being folded due to external force generated when the electric trolley is used on a bumpy road surface.

Description

Technical Field

[0001] The present application relates to the technical field of trolleys, and in particular to an electric trolley. Background Art

[0002] A trolley is a transport tool that is pushed and pulled by manpower. It is widely used in various places in life to transport items within a short distance because of its low cost, simple maintenance, easy operation, light weight, and ability to work in places where motor vehicles are inconvenient to use. As people's needs further increase, electric trolleys are gradually derived. The electric trolley includes a body, a drive unit, and a power supply unit for supplying power to the drive unit. In the process of using the electric trolley, the trolley is driven by the drive unit, and the user only needs to control the forward or backward direction of the trolley, saving time and effort.

[0003] Existing electric trolleys can be divided into single-motor driven and multi-motor driven. Since multi-motor driven electric trolleys do not need to set a transmission shaft between the two driving wheels, the supporting poles and folding components on the body frame can be folded together into a column shape, which occupies less space after folding. As a result, more and more users choose multi-motor driven electric trolleys. However, the driving wheels of multi-motor driven electric trolleys are independently driven by hub motors. When multiple hub motors are driven, they will rotate asynchronously, which will cause the two driving wheels set in pairs to deflect inward, causing the body frame to deform or even break. Summary of the invention

[0004] One purpose of the present application is to provide an electric trolley to improve the stability of the vehicle frame structure and avoid deformation or even breakage of the frame caused by asynchronous rotation of the driving wheels.

[0005] To achieve the above objectives, the technical solution adopted in the present application is: an electric folding trolley, comprising a frame and an operating rod connected to the frame, the frame comprising a front bracket, a rear bracket, and two side brackets and a bottom bracket arranged between the front bracket and the rear bracket, driven wheel groups are respectively arranged on both sides of the bottom of the front bracket, and driving wheel groups are respectively arranged on both sides of the bottom of the rear bracket, each of the driving wheel groups is suitable for independent rotation to drive the electric trolley, and the rear bracket is also provided with an anti-torsion member for preventing the driving wheel groups from rotating asynchronously and causing the frame to twist.

[0006] Preferably, the rear support comprises two vertical pipes arranged in parallel and a folding assembly connecting the two vertical pipes, an upper fixing seat and a lower fixing seat are respectively installed at the upper end and the lower end of the vertical pipe, the driving wheel group is arranged at the bottom of the lower fixing seat, both ends of the anti-torsion member are respectively connected to the corresponding lower fixing seat, and the anti-torsion member is located at the front side of the rear support.

[0007] As another preferred embodiment, the bottom bracket includes a front folding frame connected to the front bracket and a rear folding frame connected to the rear bracket, one end of the rear folding frame is connected to the front folding frame, and the other end of the rear folding frame is connected to the lower fixed seat on the rear bracket, and then the anti-torsion member is connected to the rear folding frame and the vertical pipe at the same time through the lower fixed seat.

[0008] Further preferably, the rear folding frame includes a center seat, two front support rods and two rear support rods, the two front support rods and the two rear support rods are symmetrically hinged on the center seat, the other ends of the two front support rods are hinged to the front folding frame, and the other ends of the two rear support rods are respectively hinged to the corresponding lower fixed seats, and then the two ends of the anti-torsion member are respectively connected to the end parts of the two rear support rods through the lower fixed seats, so that the anti-torsion member and the two rear support rods form a triangular structure.

[0009] Furthermore, a projection of the anti-torsion member on the horizontal plane does not overlap with a projection of the rear bracket on the horizontal plane.

[0010] Furthermore, the anti-twist component is configured to be foldable, and the anti-twist component includes a support seat and two supporting short tubes, one end of the two supporting short tubes is respectively hinged to the two ends of the support seat, and the other end of the two supporting short tubes is respectively hinged to the two lower fixed seats.

[0011] Further, the folding assembly includes two sliding seats and a cross tube assembly, the sliding seat is slidably mounted on the vertical tube, the cross tube assembly includes at least one folding assembly, the cross tube assembly includes two folding assemblies, the folding assembly includes a first movable tube and a second movable tube pivotally connected to each other, and two of the first movable tubes in adjacent folding assemblies are hinged, two of the second movable tubes are hinged, the first movable tube in the folding assembly close to the vertical tube is hinged to the upper fixed seat, and the second movable tube is hinged to the sliding seat; or the first movable tube in the folding assembly close to the vertical tube is hinged to the sliding seat, and the second movable tube is hinged to the upper fixed seat.

[0012] Furthermore, the operating rod is a retractable structure, and the operating rod has a handle end, and a control switch connected to the driving wheel group is provided on the handle end. The user can press or release the control switch to make the driving wheel group drive the electric trolley to move or stop.

[0013] Furthermore, the driving wheel set includes a roller and a hub motor arranged on the roller.

[0014] Furthermore, the driven wheel set is a universal wheel.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] In the electric trolley involved in the present application, an anti-torsion member is provided on the rear bracket provided with a driving wheel group. The anti-torsion member can resist the shear force generated by the asynchronous rotation of the driving wheel group, avoid deformation or even breakage of the frame, and improve the overall stability of the frame; in addition, the anti-torsion member is connected to the ends of the two rear support rods of the rear folding frame through the lower fixed seat at the same time, so that the anti-torsion member and the two rear support rods form a triangular structure with better stability. The anti-torsion member can increase the external force required to fold the bottom bracket, so that the frame remains in an expanded state during use, and avoid the external force generated when the electric trolley is used on bumpy roads causing the frame to fold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the electric trolley of this application;

[0018] Figure 2 A schematic diagram of the three-dimensional structure of the electric trolley of the present application from another perspective;

[0019] Figure 3 A front view of the electric trolley for this application;

[0020] Figure 4 A top view of the electric trolley of the present application.

[0021] In the figure: 100, frame; 110, front bracket; 120, rear bracket; 130, bottom bracket; 131, front folding frame; 132, rear folding frame; 140, side bracket; 141, middle support tube; 142, limit seat; 143, sliding connection; 200, operating rod; 210, handle end; 300, power supply unit; 400, wheel group; 410, driving wheel group; 420, driven wheel group; 500, vertical tube; 510, upper fixed seat; 520, lower fixed seat; 530, sliding seat; 600, folding assembly; 610, cross tube assembly; 611, first movable tube; 612, second movable tube; 700, center seat; 710, front support rod; 720, rear support rod; 800, anti-torsion member; 810, support seat; 820, supporting short tube. DETAILED DESCRIPTION

[0022] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0023] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0025] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0026] The present application is further described below with reference to the accompanying drawings:

[0027] like Figure 1-4 As shown, the present application provides an electric trolley, including a body and a power supply unit 300, the power supply unit 300 is used to supply power to a driving wheel set 410, so that the electric trolley can move forward or backward with the help of the driving wheel set 410. The electric trolley changes the traditional trolley that relies on human pulling into an electric drive. When using it, the user only needs to control the forward direction of the trolley, which saves time and effort, and can more conveniently transport long distances and heavy objects. It can pass through the bottom surface of different slopes and can easily cope with uphill slopes with large angles, which improves the convenience of use and applicable scenarios of the trolley.

[0028] The vehicle body includes a frame 100, a wheel set 400 and an operating rod 200. The frame 100 has a storage space for accommodating objects. The wheel set 400 includes a driven wheel set 420 and a driving wheel set 410 arranged at the bottom of the frame 100. The operating rod 200 is arranged at one end of the frame 100. When using the electric trolley, the user places the object inside the frame 100, pulls the operating rod 200 to make the driving wheel set 410 drive the frame 100 to move, so as to achieve the purpose of transporting the object. It is worth mentioning that the vehicle body can also include a fabric layer (not shown in the figure) arranged on the frame 100. The storage space of the vehicle body is limited by the frame 100 and the fabric layer. The fabric layer is arranged to reduce the weight of the vehicle body and improve the storage capacity of the vehicle body. Objects placed in the fabric layer are not easy to pass through the frame 100 and fall outside the vehicle body.

[0029] Specifically, the frame 100 includes a bottom bracket 130, side brackets 140 located on both sides of the bottom bracket 130, and a front bracket 110 and a rear bracket 120 connected to the bottom bracket 130 and the side bracket 140. The bottom bracket 130 includes a front folding frame 131 and a rear folding frame 132. The front folding frame 131 is hinged to the front bracket 110, and the rear folding frame 132 is hinged to the rear bracket 120. The two side brackets 140 are arranged on both sides of the bottom bracket 130 and the two ends are respectively connected to the front bracket 110 and the rear bracket 120. The front bracket 110, the rear bracket 120, the bottom bracket 130 and the side bracket 140 cooperate to form a storage space for accommodating objects. The front bracket 110, the rear bracket 120, the bottom bracket 130 and the side bracket 140 are all configured to be foldable.

[0030] The rear support 120 includes two vertically parallel vertical tubes 500 and a folding assembly 600. Each vertical tube 500 is provided with an upper fixing seat 510, a lower fixing seat 520, and a sliding seat 530. The sliding seat 530 is sleeved on the vertical tube 500 and can slide up and down. The upper fixing seat 510 is provided at the upper end of the vertical tube 500, and the lower fixing seat 520 is provided at the lower end of the vertical tube 500. The driving wheel group 410 is installed at the bottom of the lower fixing seat 520. The folding assembly 600 connecting the two vertical tubes 500 includes at least two cross tube assemblies 610. Figure 1In the illustrated embodiment, the folding assembly 600 includes two cross-tube assemblies 610, each cross-tube assembly 610 includes a first movable tube 611 and a second movable tube 612 pivotally connected to each other, and the two first movable tubes 611 in adjacent cross-tube assemblies 610 are hinged, and the two second movable tubes 612 are hinged, the first movable tube 611 in the cross-tube assembly 610 close to the riser 500 is hinged to the upper fixed seat 510 of the riser 500, and the second movable tube 612 is hinged to the sliding seat 530 on the riser 500; or the second movable tube 612 in the cross-tube assembly 610 close to the riser 500 is hinged to the upper fixed seat 510 of the riser 500, and the first movable tube 611 is hinged to the sliding seat 530 on the riser 500. The rear bracket 120 adopts a cross-tube folding method, and when folded, the first movable tube 611 and the second movable tube 612 in the cross-tube assembly 610 rotate, so that the two risers 500 are close to each other.

[0031] The structure of the front bracket 110 is basically the same as that of the rear bracket 120, and also includes two vertically parallel vertical tubes 500 and a folding assembly 600. The upper end and lower end of each vertical tube 500 are respectively installed with an upper fixed seat 510 and a lower fixed seat 520. The sliding seat 530 is sleeved on the vertical tube 500 and can slide up and down. The bottom of the lower fixed seat 520 of the vertical tube 500 is provided with a driven wheel group 420. The driven wheel group 420 is a universal wheel suitable for guiding. The user can control the direction of the driven wheel group 420 by operating the lever 200 to control the forward direction of the electric trolley.

[0032] One end of the side bracket 140 is connected to the front bracket 110, and the other end is connected to the rear bracket 120. The side bracket 140 includes three cross tube assemblies 610 and a center support tube 141. After the three cross tube assemblies 610 are hinged to each other, the first movable tube 611 of the cross tube assembly 610 close to the vertical tube 500 is hinged to the upper fixed seat 510 of the vertical tube 500, and the second movable tube 612 is hinged to the sliding seat 530. The upper end of the center support tube 141 is connected to the hinge point of the first movable tube 611 and the second movable tube 612 of the middle cross tube assembly 610. The lower end of the center support tube 141 is installed with a limiting seat 142. A sliding connector 143 is slidably provided on the center support tube 141. The limiting seat 142 is suitable for preventing the sliding connector 143 from falling off from the center support tube 141.

[0033] The bottom bracket 130 includes a front folding frame 131 and a rear folding frame 132. The rear folding frame 132 includes a center seat 700, two front support rods 710 and two rear support rods 720. One end of the two front support rods 710 and the two rear support rods 720 are symmetrically hinged on the center seat 700, and the other ends of the two front support rods 710 are respectively hinged to the sliding connectors 143 on the middle support tubes 141 on both sides. The other ends of the two rear support rods 720 are respectively hinged to the sliding connectors 143 on the two vertical tubes 500 of the rear bracket 120. The lower fixed seat 520 is hinged; the structure of the front folding frame 131 is basically the same as that of the rear folding frame 132, and also includes a central seat 700 and two front support rods 710 and two rear support rods 720 arranged on the central seat 700. The other ends of the two front support rods 710 in the front folding frame 131 are respectively hinged to the lower fixed seats 520 on the two vertical pipes 500 of the front bracket 110, and the other ends of the two rear support rods 720 are respectively hinged to the sliding connectors 143 on the two side brackets 140. The central seat 700 of the front folding frame 131 and the rear folding frame 132 is specifically shaped as an X-shaped structure, and the four corners of the X-shaped structure correspond to four U-shaped grooves with lower openings. Then, when the frame 100 is folded, the central seat 700 moves upward, the front support rods 710 and the rear support rods 720 are folded downward, and the vertical pipes 500 on the front bracket 110 and the vertical pipes 500 on the rear bracket 120 are moved closer to the center direction.

[0034] It is worth noting that the specific number of the cross tube assembly 610 in the front bracket 110, the rear bracket 120 and the side bracket 140 is only for reference. Figure 1 Specific description of the illustrated embodiment, in different embodiments, according to the requirements of the use scenario of the electric trolley and different size specifications, the number of cross tube assemblies 610 included in the front bracket 110, the rear bracket 120 and the side bracket 140 can be adjusted accordingly during production.

[0035] The driving wheel set 410 includes a roller and a hub motor disposed on the roller, and the two driving wheel sets 410 are suitable for independent rotation without affecting each other. However, the two independently rotating hub motors may rotate asynchronously, so that the two driving wheel sets 410 tend to deflect inward, forming a shear force on the frame 100, causing the folding assembly 600 on the rear bracket 120 and the side bracket 140 to be twisted, deformed, or even broken. In order to improve the structural stability of the frame 100 and prevent the frame 100 from breaking, an anti-torsion member 800 is provided on the rear bracket 120, and the two ends of the anti-torsion member 800 are respectively connected to the two vertical pipes 500 on the rear bracket 120, and the anti-torsion member 800 is provided on the front side of the lower ends of the two vertical pipes 500, and the projection of the anti-torsion member 800 on the horizontal plane does not overlap with the projection of the rear bracket 120 on the horizontal plane, so that the two vertical pipes 500 and the anti-torsion member 800 form an isosceles trapezoidal structure, and the force generated by the asynchronous rotation of the driving wheel group 410 is transmitted to the anti-torsion member 800, and the structural strength of the anti-torsion member 800 is higher than that of the folding assembly 600, so that the folding assembly 600 on the vertical pipe 500 can be prevented from being deformed. The anti-torsion member 800 is provided on the front side of the lower ends of the two vertical pipes 500 instead of being directly provided between the two vertical pipes 500, so as to further improve the supporting effect of the anti-torsion member 800.

[0036] The anti-torsion member 800 is configured to be foldable, and includes a support seat 810 and two support short tubes 820. One ends of the two support short tubes 820 are respectively hinged to the two ends of the support seat 810, and the other ends of the two support short tubes 820 are respectively hinged to the vertical pipe 500. The support seat 810 adopts a U-shaped member with a lower opening. When the frame 100 is folded, the support seat 810 moves upward, and the two support short tubes 820 are folded and moved closer to each other.

[0037] In other embodiments, the two ends of the anti-torsion member 800 are respectively hinged to the lower fixed seat 520 of the rear bracket 120, and the rear support rod 720 of the rear folding frame 132 is also hinged to the lower fixed seat 520, so that the anti-torsion member 800 is connected to the rear support rod 720 of the rear folding frame 132 and the vertical pipe 500 of the rear bracket 120 through the lower fixed seat 520 of the rear bracket 120. The anti-torsion member 800 is arranged on the end of the rear support rod 720, so that the anti-torsion member 800 and the two rear support rods 720 form a triangular structure. The anti-torsion member 800 and the two rear support rods 720 in a triangular structure have better structural stability and can provide better structural strength to prevent the frame 100 from torsional deformation. At the same time, the anti-torsion member 800 can increase the folding resistance of the bottom bracket 130 to increase the force required to fold the bottom bracket 130, so that the frame 100 can remain in an unfolded state during use, thereby preventing the electric trolley from generating external force when used on a bumpy road surface and causing the frame 100 to fold.

[0038] The operating rod 200 is a retractable structure. The operating rod 200 can be set at the front end of the frame 100 or at the rear end of the frame 100. The position where the operating rod 200 is set is generally opposite to the position where the driving wheel set 410 is set, that is, when the driving wheel set 410 is set at the bottom of the rear bracket 120, the operating rod 200 is set at the front end of the frame 100; when the driving wheel set 410 is set at the bottom of the front bracket 110, the operating rod 200 is set at the rear end of the frame 100. Of course, the operating rod 200 and the driving wheel set 410 can also be set on the same side. Figure 1 In the illustrated embodiment, the operating rod 200 is disposed at the front end of the frame 100, and the operating rod 200 is hinged to the front bracket 110 so that the operating rod 200 can rotate between its initial position and the push-pull position. The operating rod 200 is provided with a handle end 210, and the user can hold the handle end 210 to push and pull the vehicle body. The handle end 210 is a ring structure, which allows the user's fingers to pass through the handle end 210 to hold, thereby improving the operating feel and reducing the difficulty of pushing and pulling. The handle end 210 of the operating rod 200 is also provided with a control switch, which is connected to the driving wheel group 410 and the power supply unit 300, so that the user presses or releases the control switch while holding the handle end 210, so that the driving wheel group 410 drives the electric trolley to move or stop.

[0039] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An electric trolley, characterized in that: The electric trolley comprises a frame and an operating rod connected to the frame, wherein the frame comprises a front bracket, a rear bracket, and two side brackets and a bottom bracket arranged between the front bracket and the rear bracket, driven wheel groups are respectively arranged on both sides of the bottom of the front bracket, and driving wheel groups are respectively arranged on both sides of the bottom of the rear bracket, each driving wheel group is suitable for rotating independently to drive the electric trolley, and an anti-torsion member is also arranged on the rear bracket for preventing the driving wheel group from rotating asynchronously and causing the frame to twist.

2. The electric trolley according to claim 1, characterized in that: The rear bracket includes two vertical pipes arranged in parallel and a folding assembly connecting the two vertical pipes, an upper fixing seat and a lower fixing seat are respectively installed at the upper end and the lower end of the vertical pipe, the driving wheel group is arranged at the bottom of the lower fixing seat, the two ends of the anti-torsion member are respectively connected to the corresponding lower fixing seat, and the anti-torsion member is located at the front side of the rear bracket.

3. The electric trolley according to claim 2, characterized in that: The bottom bracket includes a front folding frame connected to the front bracket and a rear folding frame connected to the rear bracket, one end of the rear folding frame is connected to the front folding frame, and the other end of the rear folding frame is connected to the lower fixing seat on the rear bracket, and then the anti-torsion member is connected to the rear folding frame and the vertical pipe at the same time through the lower fixing seat.

4. The electric trolley according to claim 3, characterized in that: The rear folding frame includes a center seat, two front support rods and two rear support rods, the two front support rods and the two rear support rods are symmetrically hinged on the center seat, the other ends of the two front support rods are hinged to the front folding frame, and the other ends of the two rear support rods are respectively hinged to the corresponding lower fixed seats, and then the two ends of the anti-torsion member are respectively connected to the end parts of the two rear support rods through the lower fixed seats, so that the anti-torsion member and the two rear support rods form a triangular structure.

5. The electric trolley according to any one of claims 2 to 4, characterized in that: The projection of the anti-torsion member on the horizontal plane does not overlap with the projection of the rear bracket on the horizontal plane.

6. The electric trolley according to claim 5, characterized in that: The anti-twist component is configured to be foldable, and includes a support seat and two short support tubes, one end of the two short support tubes are respectively hinged to the two ends of the support seat, and the other end of the two short support tubes are respectively hinged to the two lower fixed seats.

7. The electric trolley according to claim 2, characterized in that: The folding assembly includes two sliding seats and at least two cross-tube assemblies, the sliding seats are slidably mounted on the riser, the cross-tube assembly includes a first movable tube and a second movable tube pivotally connected to each other, and two of the first movable tubes in adjacent cross-tube assemblies are hinged, two of the second movable tubes are hinged, the first movable tube in the cross-tube assembly close to the riser is hinged to the upper fixed seat, and the second movable tube is hinged to the sliding seat; or the first movable tube in the cross-tube assembly close to the riser is hinged to the sliding seat, and the second movable tube is hinged to the upper fixed seat.

8. The electric trolley according to claim 1, characterized in that: The operating rod is a retractable structure, and the operating rod has a handle end. The handle end is provided with a control switch connected to the driving wheel group. The user can press or release the control switch to make the driving wheel group drive the electric trolley to move or stop.

9. The electric trolley according to claim 8, characterized in that: The driving wheel set comprises a roller and a hub motor arranged on the roller.

10. The electric trolley according to claim 9, characterized in that: The driven wheel set is a universal wheel.

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