Walking type electric tractor

Abstract

The invention relates to the technical field of tractors, and particularly discloses a walking type electric tractor which comprises a tractor frame body, a driving assembly, a traction assembly and a clamping assembly, the traction assembly comprises a traction arm with one end rotatably connected with the tractor frame body, and the clamping assembly comprises a clamp fixed to the other end of the traction arm; the traction arm is rotationally connected with the frame body, steering is facilitated, the traction arm can rotate to avoid a battery bin opening located in the top of the frame body, loading and unloading of a battery are facilitated, meanwhile, after the traction arm laterally moves by a certain distance, the traction arm can be locked through the locking piece, and the situation that the traction arm automatically resets and hits people or other objects is avoided; and in addition, the clamp can be suitable for trolley transverse rods of different heights, and the application performance of the tractor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tractors, in particular to a walking electric tractor. Background Art

[0002] With the development of society and the improvement of people's living standards, various logistics handling places such as factories, airports, railway stations, etc. often need to use trolleys to carry luggage or goods. However, it is more laborious for users to use manual trolleys to push full of items in these occasions, especially in the case of long-distance transportation or slopes, so electric tractors have appeared on the market to solve this problem.

[0003] However, existing electric tractors often use ropes or fixed traction arms to drive the carts to move, but they have the following disadvantages: First, using ropes for traction can easily cause the ropes to be entangled in the wheels, which is more dangerous; second, the fixed traction arm is more rigid in turning, and because the traction arm is usually located on the top of the cart, its battery compartment can only be set on the side of the frame, which is inconvenient to install and easy to get wet; third, the model of the traction arm can usually only be applicable to one model of cart, and the applicability is poor. Summary of the invention

[0004] The present invention is made in consideration of the above-mentioned problems. The purpose of the invention is to provide a walking electric tractor, which can avoid the battery compartment opening by rotating the traction arm, making it easy to load and unload the battery, and the traction arm can be locked after being moved sideways, so it has high safety performance.

[0005] To achieve the above-mentioned object, the present invention provides a walking electric tractor for towing a cart, the tractor comprising a frame body, a driving assembly, a traction assembly and a clamping assembly, the frame body being provided with a battery compartment with an opening at the top thereof, the driving assembly comprising a driving wheel at the bottom of the frame body and a battery in the battery compartment, the battery being electrically connected to the driving wheel, the traction assembly comprising a traction arm rotatably connected to the top of the frame body at one end, the clamping assembly comprising a clamp for clamping the cart, the clamp being mounted on an end of the traction arm away from the frame body;

[0006] The traction assembly also includes an elastic member and a locking member connected to the traction arm. The traction arm has a first centered position and a second lateral position. The traction arm can be rotated to the second position to avoid the opening of the battery compartment. The elastic member is used to drive the traction arm to remain in the first position. When the traction arm is located at the second position, the locking member can be connected to the top of the frame body to lock the traction arm.

[0007] According to the above-mentioned walking electric tractor, the traction assembly further includes a first mounting seat, a rotating shaft and a positioning frame, the first mounting seat is detachably fixed to the top of the frame body by screws, the positioning frame is fixed to one end of the traction arm and is rotatably connected to the first mounting seat by the rotating shaft;

[0008] The elastic member is configured as a torsion spring, and the torsion spring is sleeved on the outer side of the rotating shaft.

[0009] According to the above-mentioned walking electric tractor, the locking member is provided with a spring latch, the positioning frame is provided with a first positioning hole, and the first mounting seat is provided with a second positioning hole. When the traction arm is rotated to the second position, the first positioning hole is connected with the second positioning hole, and the spring latch can be inserted into the connecting hole between the first positioning hole and the second positioning hole.

[0010] According to the above-mentioned walking electric tractor, the spring latch comprises a base and an elastic plug connector, the elastic plug connector is inserted into the base and can rotate around the base, the top of the base is provided with a first card slot and a second card slot arranged crosswise, the depth of the first card slot is greater than the depth of the second card slot, and a limiting portion is provided on one side of the elastic plug connector, and the limiting portion can be clamped in the first card slot or the second card slot;

[0011] When the limiting portion is located in the first slot, the lower end of the elastic plug connector extends out from below the base, and when the limiting portion is located in the second slot, the lower end of the elastic plug connector is retracted in the base.

[0012] According to the above-mentioned walking electric tractor, a limiting column is provided on the first mounting seat, and when the torsion spring drives the traction arm to rotate to the first position, one end of the torsion spring abuts against the limiting column to limit the traction arm from continuing to rotate.

[0013] According to the above-mentioned walking electric tractor, the clamp includes a positioning plate, a clamp and a first limiting plate, the clamp is fixed on the positioning plate, and the clamp and the first limiting plate together form a clamping space for clamping the cart cross bar.

[0014] According to the above-mentioned walking electric tractor, the clamping assembly also includes a second mounting seat, a motor, a connecting rod and a piston rod. The second mounting seat is fixed to the end of the traction arm away from the frame body in a liftable manner. The positioning plate is swingably connected to the second mounting seat through a connecting rod. The motor is fixed to the second mounting seat and is connected to the connecting rod through the piston rod.

[0015] According to the above-mentioned pedestrian electric tractor, a second limiting plate, a guide column and a male connector are provided at the bottom of the battery compartment, and a plurality of the second limiting plates together form a guide area for inserting the bottom end of the battery. A handle is provided at the top of the battery, and a third positioning hole and a female connector are provided at the bottom of the battery. The guide column can be inserted into the third positioning hole, and the male connector can be inserted into the female connector.

[0016] According to the above-mentioned walking electric tractor, a charging port is provided on one side of the frame body, and the charging port is electrically connected to the battery.

[0017] According to the above-mentioned walking electric tractor, the driving assembly further includes a first universal wheel and an operating handle, the driving wheel is located at the front end of the bottom of the frame body, the first universal wheel is located at the tail end of the bottom of the frame body, the operating handle is used to control the driving wheel, and the frame body is rotatably arranged on the driving wheel;

[0018] When the clamping assembly is connected to the cart, the first universal wheel is in a suspended state; when the clamping assembly is separated from the cart, the first universal wheel can be connected to the ground.

[0019] The present invention has the following beneficial effects:

[0020] 1. The traction arm can be rotatably connected to the frame body, which is conducive to steering. The rotation of the traction arm can avoid the battery compartment opening on the top of the frame body, which is convenient for loading and unloading the battery. At the same time, after the traction arm moves sideways for a certain distance, the traction arm can be locked by the locking piece to prevent the traction arm from automatically resetting and hitting people or other objects, thereby improving safety performance;

[0021] 2. When the traction arm moves to the second position, the elastic plug connector can be rotated to make its limiting part engage with the first slot. Then, under the action of its own elastic force, it can automatically extend downward into the connecting hole between the first positioning hole and the second positioning hole, and quickly position. When the traction arm is not in the second position, the elastic plug connector can be rotated to make its limiting part engage with the second slot. At this time, since the lower end of the elastic plug connector is contracted in the base, it can be avoided that it interferes with the rotation of the traction arm.

[0022] 3. Since the second mounting seat is fixed on the end of the traction arm away from the frame body in a liftable manner, the overall height of the clamping assembly can be adjusted to clamp the cart cross bars of different heights, and the applicability is good;

[0023] 4. Multiple second limit plates can be used to guide the insertion of the battery, and the battery can be quickly installed through the guide column and the male connector;

[0024] 5. When the tractor is towing the cart, the towing arm is connected to the cart through the clamping assembly, which increases the height of the rear end of the frame body, thereby increasing the height of the first universal wheel, making it suspended in the air and improving its passability. When the tractor is unloaded, the rear end of the frame body drops, at which time the first universal wheel is connected to the ground to play a supporting role, and the turning radius is very small. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the assembly of a tractor and a cart of an embodiment;

[0026] Figure 2 is a structural schematic diagram of the tractor of the embodiment in an unloaded state;

[0027] Figure 3 is a schematic structural diagram of a traction assembly of an embodiment;

[0028] Figure 4 2. It is a schematic diagram of the spring latch structure of an embodiment;

[0029] Figure 5 is a schematic structural diagram of a clamping assembly of an embodiment;

[0030] Figure 6 is a schematic diagram of the battery and the bottom structure of the battery compartment of the embodiment;

[0031] Figure 7 Schematic diagram of the bottom structure of the battery in the embodiment.

[0032] In the figure:

[0033] 1. Frame body; 11. Battery compartment; 111. Second limit plate; 112. Guide column; 113. Male connector; 12. Charging port;

[0034] 2. driving assembly; 21. driving wheel; 22. battery; 221. third positioning hole; 222. female connector; 223. handle; 23. first universal wheel; 24. operating handle;

[0035] 3. traction assembly; 31. traction arm; 32. torsion spring; 33. spring latch; 331. base; 331a. first slot; 331b. second slot; 332. elastic plug connector; 332a. limiter; 34. first mounting seat; 341. second positioning hole; 342. limiter column; 35. rotating shaft; 36. positioning frame;

[0036] 4. Clamping assembly; 41. Positioning plate; 42. Clamp; 43. First stop plate; 44. Second mounting seat; 45. Motor; 46. Connecting rod; 47. Piston rod;

[0037] 5. Push the cart. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0039] like Figure 1-7 As shown, a walking electric tractor, which is used for towing a cart 5, includes a frame body 1, a driving assembly 2, a traction assembly 3 and a clamping assembly 4.

[0040] Specifically, a battery compartment 11 with an opening at the top is provided on the frame body 1, and the opening of the battery compartment 11 is located at the position of the frame body 1. During the installation of the battery 22, it is only necessary to vertically lower the battery 22 along the opening. The driving assembly 2 includes a driving wheel 21 located at the bottom of the frame body 1 and a battery 22 located in the battery compartment 11. The battery 22 is electrically connected to the driving wheel 21 and is used to provide power for the driving wheel 21. The traction assembly 3 includes a traction arm 31 rotatably connected to the top of the frame body 1 at a first end. The clamping assembly 4 includes a clamp for clamping the cart 5. The clamp is installed on one end of the traction arm 31 away from the frame body 1. After the clamp clamps the cart 5, it can be driven to move by the driving wheel 21, thereby driving the cart to move together. During the steering process of the driving wheel 21, since the traction arm 31 can rotate relative to the frame body 1, it is easier to turn.

[0041] In this embodiment, a universal wheel is provided at the front end of the bottom of the cart 5, and a fixed wheel is provided at the rear end of the bottom of the cart. When the driving wheel 21 drives the frame body 1 to turn, the traction arm 31 and the frame body 1 rotate, and then the traction arm 31 drives the cart to turn.

[0042] Specifically, the traction assembly 3 also includes an elastic member and a locking member connected to the traction arm 31. The traction arm 31 has a first position centered and a second position shifted to the side. The traction arm 31 can be rotated to the second position to avoid the opening of the battery compartment 11. The elastic member is used to drive the traction arm 31 to remain in the first position. When the traction arm 31 is in the second position, the locking member can be connected to the top of the frame body 1 to lock the traction arm 31. In the process of the traction arm 31 pulling the cart straight, it mainly remains in the first position. When the traction arm 31 is not needed, the traction arm 31 can be manually driven to the second position and then locked by the locking member to prevent it from automatically resetting due to the elastic member, thereby preventing it from automatically resetting and hitting people or other objects.

[0043] Among them, the first position in which the traction arm 31 is centered refers to the middle of the rear end of the frame body 1. The elastic member provides elastic force to keep the traction arm 31 in the first position, and the second position is the position after the traction arm 31 is rotated to the left or right by a preset angle. Of course, a third position can also be set, and the third position and the second position are symmetrically arranged on both sides of the first position.

[0044] Specifically, the traction assembly 3 also includes a first mounting seat 34, a rotating shaft 35 and a positioning frame 36. The first mounting seat 34 is detachably fixed to the top of the frame body 1 by screws. The positioning frame 36 is fixed to one end of the traction arm 31 and is rotatably connected to the first mounting seat 34 through the rotating shaft 35. That is, the traction arm 31 is rotatably connected to the first mounting seat 34 through the positioning frame 36 and the rotating shaft 35. The first mounting seat 34 can be quickly connected to the frame body 1. The elastic member is set as a torsion spring 32. The torsion spring 32 is sleeved on the outside of the rotating shaft 35. The torsion spring 32 can apply an elastic force to the rotating shaft 35, and the traction arm 31 is driven to rotate to the first position through the rotating shaft 35.

[0045] Among them, a limiting column 342 is provided on the first mounting seat 34. When the torsion spring 32 drives the traction arm 31 to rotate to the first position, one end of the torsion spring 32 abuts against the limiting column 342 to limit the traction arm 31 from continuing to rotate. That is, after the locking member unlocks the traction arm 31, the torsion spring 32 can exert a reset force on the traction arm 31 and drive the traction arm 31 to rotate to the first position. After its reset, the torsion spring 32 generally still has elastic force, which limits the torsion spring 32 from continuing to output elastic force on the traction arm 31 through the limiting column 342 to ensure accurate reset.

[0046] Specifically, the locking member is provided with a spring latch 33, a first positioning hole is provided on the positioning frame 36, and a second positioning hole 341 is provided on the first mounting seat 34. When the traction arm 31 rotates to the second position, the first positioning hole is connected to the second positioning hole 341, and the spring latch 33 can be inserted into the connecting hole between the first positioning hole and the second positioning hole 341, that is, the spring latch 33 has a spring inside, which can drive the spring latch 33 to move downward. When the traction arm 31 rotates to the second position, the spring inside the spring latch 33 drives it to be inserted downward into the first positioning hole and the second positioning hole 341, thereby locking the traction arm 31. The locking is convenient and fast.

[0047] In order to prevent the spring latch 33 from automatically inserting downward and interfering with the steering of the traction arm 31, the spring latch 33 includes a base 331 and an elastic plug joint 332. The elastic plug joint 332 is inserted into the base 331 and can rotate around the base 331. The top of the base 331 is provided with a first card slot 331a and a second card slot 331b arranged crosswise. The depth of the first card slot 331a is greater than the depth of the second card slot 331b, and a limiting portion 332a is provided on one side of the elastic plug joint 332. The limiting portion 332a can be clamped in the first card slot 331a and the second card slot 331b. Since the depth of the first card slot 331a is relatively deep, when the limiting portion 332a is located in the first card slot 331a, the limiting portion 332a can be clamped in the first card slot 331a and the second card slot 331b. When the traction arm 31 is in normal use, the elastic plug joint 332 is rotated so that the limiting portion 332a remains in the second slot 331b. When the traction arm 31 is not in use, the traction arm 31 is rotated to the second position, and then the elastic plug joint 332 is rotated so that the limiting portion 332a remains in the first slot 331a.

[0048] In order to adapt to different models of carts, the clamp includes a positioning plate 41, a clamp 42 and a first limiting plate 43. The clamp 42 is fixed on the positioning plate 41, and the clamp 42 and the first limiting plate 43 together form a clamping space for clamping the cross bar of the cart 5. The clamp 42 and the first limiting plate 43 can cooperate to clamp the cross bar of the cart 5.

[0049] Specifically, the clamping assembly also includes a second mounting seat 44, a motor 45, a connecting rod 46 and a piston rod 47. The second mounting seat 44 can be raised and lowered and fixed on the end of the traction arm 31 away from the frame body 1, and then the overall height of the clamping assembly can be adjusted through the second mounting seat 44, which is suitable for cart cross bars of different heights. The positioning plate 41 can be swung and connected to the second mounting seat 44 through the connecting rod 46. The motor 45 is fixed on the second mounting seat 44 and connected to the connecting rod 46 through the piston rod 47. The motor 45 drives the connecting rod 46 to swing through the piston rod 47, and then drives the positioning plate 41 to swing together, moving toward or away from the first limit plate 43 to achieve clamping and releasing of the goods. In this embodiment, the connecting rod 46 and the positioning plate 41 are surrounded to form a parallelogram. Therefore, when it drives the positioning plate 41 to swing, the positioning plate 41 can still remain parallel to the first limit plate 43 to prevent scratching the cart cross bar.

[0050] In order to achieve height adjustment of the second mounting seat 44, a mounting plate is provided on one end of the traction arm 31, and the mounting plate is provided with multiple mounting holes arranged in the vertical direction. The height adjustment of the second mounting seat 44 is achieved through the mounting holes at different heights.

[0051] In order to realize the rapid assembly of the battery 22, a second limiting plate 111, a guide column 112 and a connector male head 113 are provided at the bottom of the battery compartment 11. The multiple second limiting plates 111 together form a guiding area for the bottom end of the battery 22 to be inserted. After the bottom end of the battery 22 contacts the multiple second limiting plates 111, it will be restricted from lateral movement by the multiple second limiting plates 111. A handle 223 is provided on the top of the battery 22, and the handle 223 is used for holding. A third positioning hole 221 and a connector female head 222 are provided at the bottom of the battery 22. The guide column 112 can be inserted into the third positioning hole 221, and the connector male head 113 can be inserted into the connector female head 222. When it is directly lowered, the guide column 112 is automatically assembled into the third positioning hole 221, and the connector male head 113 is automatically inserted into the connector female head 222, so as to realize rapid and accurate positioning and installation.

[0052] In this embodiment, a charging port 12 is provided on one side of the frame body 1, and the charging port 12 is electrically connected to the battery 22, that is, the battery 22 can be charged on the outside of the frame body 1. Similarly, the battery 22 can also be taken out for charging.

[0053] Specifically, the driving assembly 2 also includes a first universal wheel 23 and an operating handle 24. The driving wheel 21 is located at the front end of the bottom of the frame body 1, and the first universal wheel 23 is located at the tail end of the bottom of the frame body 1. The operating handle 24 is used to manipulate the driving wheel 21, and is used to control the forward direction of the driving wheel 21. The frame body 1 is rotatably arranged on the driving wheel 21. When the clamping assembly 4 is connected to the cart, the traction arm 31 can increase the height of the tail end of the frame body 1, and the first universal wheel 23 is in a suspended state. At this time, the overall passability of the vehicle can be improved. When the clamping assembly 4 is separated from the cart, the first universal wheel 23 can be connected to the ground, thereby providing support for the frame body 1, and its turning radius is relatively small.

[0054] The technical solution of the present invention is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the concept of the present invention. The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art of the invention may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

[0055] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A walking electric tractor for towing a cart, characterized in that: The tractor comprises a frame body, a driving assembly, a traction assembly and a clamping assembly, the frame body is provided with a battery compartment with an opening at the top thereof, the driving assembly comprises a driving wheel located at the bottom of the frame body and a battery located in the battery compartment, the battery is electrically connected to the driving wheel, the traction assembly comprises a traction arm with one end rotatably connected to the top of the frame body, the clamping assembly comprises a clamp for clamping the cart, the clamp is installed on one end of the traction arm away from the frame body; The traction assembly also includes an elastic member and a locking member connected to the traction arm. The traction arm has a first centered position and a second lateral position. The traction arm can be rotated to the second position to avoid the opening of the battery compartment. The elastic member is used to drive the traction arm to remain in the first position. When the traction arm is located at the second position, the locking member can be connected to the top of the frame body to lock the traction arm.

2. A walking electric tractor according to claim 1, characterized in that: The traction assembly further includes a first mounting seat, a rotating shaft and a positioning frame, wherein the first mounting seat is detachably fixed to the top of the frame body by screws, and the positioning frame is fixed to one end of the traction arm and is rotatably connected to the first mounting seat by the rotating shaft; The elastic member is configured as a torsion spring, and the torsion spring is sleeved on the outer side of the rotating shaft.

3. A walking electric tractor according to claim 2, characterized in that: The locking member is provided with a spring latch, the positioning frame is provided with a first positioning hole, and the first mounting seat is provided with a second positioning hole. When the traction arm rotates to the second position, the first positioning hole is connected with the second positioning hole, and the spring latch can be inserted into the connecting hole between the first positioning hole and the second positioning hole.

4. A walking electric tractor according to claim 3, characterized in that: The spring latch comprises a base and an elastic plug connector, the elastic plug connector is inserted into the base and can rotate around the base, a first card slot and a second card slot arranged crosswise are provided on the top of the base, the depth of the first card slot is greater than the depth of the second card slot, and a limiting portion is provided on one side of the elastic plug connector, and the limiting portion can be clamped in the first card slot or the second card slot; When the limiting portion is located in the first slot, the lower end of the elastic plug connector extends out from below the base, and when the limiting portion is located in the second slot, the lower end of the elastic plug connector is retracted in the base.

5. A walking electric tractor according to claim 2, characterized in that: A limiting column is provided on the first mounting seat. When the torsion spring drives the traction arm to rotate to the first position, one end of the torsion spring abuts against the limiting column to limit the traction arm from further rotating.

6. A walking electric tractor according to claim 1, characterized in that: The clamp comprises a positioning plate, a clamp and a first limiting plate. The clamp is fixed on the positioning plate, and the clamp and the first limiting plate together form a clamping space for clamping the cart cross bar.

7. A walking electric tractor according to claim 6, characterized in that: The clamping assembly also includes a second mounting seat, a motor, a connecting rod and a piston rod. The second mounting seat can be raised and lowered and fixed on an end of the traction arm away from the frame body. The positioning plate can be swingably connected to the second mounting seat through a connecting rod. The motor is fixed on the second mounting seat and connected to the connecting rod through the piston rod.

8. A walking electric tractor according to claim 1, characterized in that: A second limiting plate, a guide column and a male connector are provided at the bottom of the battery compartment, and a plurality of the second limiting plates together form a guide area for inserting the bottom end of the battery. A handle is provided at the top of the battery, and a third positioning hole and a female connector are provided at the bottom of the battery. The guide column can be inserted into the third positioning hole, and the male connector can be inserted into the female connector.

9. A walking electric tractor according to claim 8, characterized in that: A charging port is provided on one side of the frame body, and the charging port is electrically connected to the battery.

10. The pedestrian electric tractor according to claim 1, characterized in that: The driving assembly further includes a first universal wheel and an operating handle, wherein the driving wheel is located at the front end of the bottom of the frame body, the first universal wheel is located at the rear end of the bottom of the frame body, the operating handle is used to control the driving wheel, and the frame body is rotatably arranged on the driving wheel; When the clamping assembly is connected to the cart, the first universal wheel is in a suspended state; when the clamping assembly is separated from the cart, the first universal wheel can be connected to the ground.

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