Electric traction device

Abstract

The utility model discloses an electric traction device. The electric traction device comprises a winding drum; the first speed reducing mechanism is located in the winding drum, and the first speed reducing mechanism is provided with a first input part, a first output part and a first speed reducing assembly; at least part of the driving part is located in the winding drum, and the driving part is connected to the first input part; the second speed reducing mechanism is located at one end of the winding drum, the second speed reducing mechanism is provided with a second input part, a second output part and a second speed reducing assembly, the second output part is located between the second input part and the winding drum and connected to the winding drum, and the second output part and the winding drum rotate synchronously; and a transmission shaft passing through the second speed reduction mechanism for transmitting the rotational driving force of the first output portion to the second input portion. The portable electronic cigarette is compact in structure, small in size, good in portability and good in use safety.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to an electric traction device. Background Art

[0002] The electric traction device usually includes a drive motor and a winch drum. The traction rope is hung on the object to be towed. The drive motor drives the winch drum to rotate after deceleration through a multi-stage reduction mechanism, thereby driving the traction rope to be wound around the winch drum, so that the object to be towed moves with the traction rope.

[0003] In current electric traction devices, the driving motor and the multi-stage reduction mechanism are generally arranged at both ends of the hoisting drum, which makes the overall volume of the electric traction device relatively large. Utility Model Content

[0004] The present application provides an electric traction device, which has a compact structure, a small size and good portability.

[0005] The electric traction device provided by the present application comprises:

[0006] winch;

[0007] A first reduction mechanism is located in the hoisting drum, the first reduction mechanism has a first input part, a first output part and a first reduction assembly, the first reduction assembly reduces the rotation speed of the rotation driving force input to the first input part to a specified speed and then outputs it from the first output part;

[0008] a driving component, at least partially disposed within the hoisting drum, the driving component being connected to the first input portion and configured to generate a rotational driving force for rotating the first input portion;

[0009] a second reduction mechanism, located at one end of the hoisting drum, the second reduction mechanism having a second input portion, a second output portion, and a second reduction assembly, the second output portion being located between the second input portion and the hoisting drum, the second output portion being connected to the hoisting drum, the second output portion rotating synchronously with the hoisting drum, the second reduction assembly reducing the rotational speed of the rotational driving force input to the second input portion to a specified speed and then outputting it from the second output portion;

[0010] The transmission shaft passes through the second reduction mechanism and is used to transmit the rotational driving force of the first output part to the second input part.

[0011] Preferably, a cylindrical component is arranged in the hoisting drum, and the first reduction mechanism is arranged in the cylindrical component, the first reduction mechanism includes a first planetary gear, the first planetary gear has a first sun gear, a first fixed gear ring and a first planetary carrier, the first input part is the first sun gear, the first output part is the first planetary carrier, and the first fixed gear ring is arranged on the inner wall of the cylindrical component.

[0012] Preferably, an end cover is fixedly provided at one end of the hoisting drum, the second reduction mechanism is arranged in the end cover, the second reduction mechanism comprises a second planetary gear and a third planetary gear, the second planetary gear comprises a second sun gear, a second fixed gear ring and a second planet carrier, the second input part is the second sun gear, and the second fixed gear ring is arranged on the inner wall of the end cover;

[0013] The third planetary gear comprises a third sun gear, a third planetary gear, a third fixed gear ring, a third planet carrier and a movable gear ring. The second planet carrier is connected to the third sun gear. The third fixed gear ring is arranged on the inner wall of the end cover. The movable gear ring is rotatably arranged in the end cover. The third planetary gear is meshed with the third fixed gear ring and the movable gear ring at the same time. The movable gear ring drives the winch drum to rotate. The second output part is the movable gear ring.

[0014] Preferably, the third fixed gear ring is clamped and fixed on the inner wall of the end cover to limit the rotation of the third fixed gear ring relative to the end cover.

[0015] Preferably, a gear portion is provided at one end of the hoisting drum, and the movable gear ring is coaxially arranged with the gear portion and meshes with each other.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0017] The electric traction device of the present application arranges the first reduction mechanism in the hoisting drum, the driving component is at least partially located in the hoisting drum, and in the second reduction mechanism, the second output part is located between the second input part and the hoisting drum, and the second output part is connected to the hoisting drum. That is to say, the second reduction mechanism is transmitted in the direction close to the hoisting drum, so that the end of the hoisting drum can be connected to the second output part without being lengthened. In this way, the electric traction device of the present application makes the electric traction device compact in structure by designing the arrangement positions of the driving component, the first reduction mechanism, and the second reduction mechanism and the transmission direction of the second reduction mechanism, thereby achieving a reduction in the overall volume of the electric traction device and improving the portability of the electric traction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a schematic structural diagram of an electric traction device of an embodiment;

[0020] Figure 2 An exploded view of an electric traction device according to an embodiment;

[0021] Figure 3 is a cross-sectional view of the electric traction device of the embodiment (with the housing removed);

[0022] Figure 4 An exploded view of the electric traction device of the embodiment (with the housing removed);

[0023] Figure 5 An exploded view of the driving component and the first reduction mechanism of the embodiment;

[0024] Figure 6 is an exploded view of the second reduction mechanism of the embodiment;

[0025] Figure 7 It is a three-dimensional cross-sectional view of the hoisting drum, the first speed reduction mechanism and the second speed reduction mechanism of the embodiment;

[0026] Figure 8 It is a schematic structural diagram of the working part of the electric traction device of the embodiment. DETAILED DESCRIPTION

[0027] The present application provides an electric traction device, which is used to solve the technical problems in the prior art that the electric traction device is not compact enough and has a large volume.

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products, or devices.

[0030] like Figures 1 to 8 As shown, the electric traction device of this embodiment includes a housing 10, wherein the housing 10 includes a first housing 11 and a second housing 12 which are arranged in a matched manner. The first housing 11 and the second housing 12 can be connected to or separated from each other.

[0031] A working part is disposed in the housing 10 , and the working part includes a hoisting drum 20 , a first reduction mechanism 30 , a driving component, a second reduction mechanism 50 and a transmission shaft 60 .

[0032] The hoisting drum 20 is rotatably arranged in the shell 10. Specifically, a first load-bearing plate 13 and a second load-bearing plate 14 are arranged in the shell 10. The first load-bearing plate 13 and the second load-bearing plate 14 are connected to each other through a plurality of connecting shafts. The hoisting drum 20 is located between the first load-bearing plate 13 and the second load-bearing plate 14. Both ends of the hoisting drum 20 are rotatably connected to the first load-bearing plate 13 and the second load-bearing plate 14 respectively.

[0033] The first hook 15 is connected to the first load-bearing plate 13 and the second load-bearing plate 14 . The first hook 15 extends out of the housing 10 . The first hook 15 is used to be hooked on a fixed object to suspend the electric traction device.

[0034] A traction rope 16 is wound around the hoisting drum 20, one end of the traction rope 16 is fixed on the hoisting drum 20, and the other end of the traction rope 16 is a free end. The free end of the traction rope 16 is connected to a second hook 17, and the second hook 17 is used to hook the object to be towed, so that when the hoisting drum 20 drives the traction rope 16 to be wound around the hoisting drum 20, the object to be towed can move with the traction rope 16.

[0035] A cylindrical component 21 is provided in the hoisting drum 20, and the first reduction mechanism 30 is located in the hoisting drum 20. More precisely, the first reduction mechanism 30 is located in the cylindrical component 21. The first reduction mechanism 30 has a first input part, a first output part and a first reduction assembly. The first reduction assembly reduces the rotational speed of the rotational driving force input to the first input part to a specified speed and then outputs it from the first output part.

[0036] The first reduction mechanism 30 includes a first planetary gear, which has a first sun gear 31, a first fixed gear ring 32, a first planet carrier 33 and a first planetary gear 34. The first input part is the first sun gear 31, and the first output part is the first planet carrier 33. The first fixed gear ring 32 is integrally formed on the inner wall of the tubular part 21. The first sun gear 31 is meshed with the first planetary gear 34, and the first planetary gear 34 is meshed with the first fixed gear ring 32. The first planetary gear 34 is installed on the first planet carrier 33, and the first planet carrier 33 is rotatable. When the first sun gear 31 drives the first planetary gear 34 to rotate, the first planetary gear 34 moves circumferentially along the first fixed gear ring 32, thereby driving the first planet carrier 33 to rotate. The rotation speed of the first planet carrier 33 is lower than that of the first sun gear 31.

[0037] The first reduction mechanism 30 is doubly surrounded by the tubular component 21 and the hoisting drum 20 to isolate the noise generated when the first reduction mechanism 30 is working.

[0038] The driving component is a motor 40, which is a DC permanent magnet motor, a brushless motor or a series-excited motor.

[0039] The motor 40 is located in the winch drum 20. The motor 40 is installed on the second load-bearing plate 14. The second load-bearing plate 14 is provided with a second opening 141. The motor 40 passes through the second opening 141 and enters into the winch drum 20. The drive shaft 41 of the motor 40 is connected to the first sun gear 31. The drive shaft 41 drives the first sun gear 31 to rotate. The drive shaft 41 rotates synchronously with the first sun gear 31.

[0040] The motor 40 is located inside the hoisting drum 20 to isolate the noise generated when the motor 40 is working.

[0041] Moreover, the motor 40 and the first reduction mechanism 30 are located inside the hoisting drum 20, thereby fully utilizing the space inside the hoisting drum 20, so that the motor 40 and the first reduction mechanism 30 will not increase the overall volume of the electric traction device.

[0042] An end cover 22 is fixedly provided at one end of the hoisting drum 20, that is, one end of the hoisting drum 20 is fixed on the first load-bearing plate 13, and the end cover 22 is installed on the first load-bearing plate 13, so that the end cover 22 is located at one end of the hoisting drum 20, and the second reduction mechanism 50 is arranged in the end cover 22, and a first opening 131 is arranged on the first load-bearing plate 13, and the opening of the end cover 22 is opposite to the first opening 131, and the second reduction mechanism 50 has a second input part, a second output part and a second reduction assembly, and the second output part is located between the second input part and the hoisting drum 20, and the second output part is connected to the hoisting drum 20, and the second output part rotates synchronously with the hoisting drum 20, and the second reduction assembly reduces the rotational speed of the rotational driving force input to the second input part to a specified speed and then outputs it from the second output part.

[0043] The second reduction mechanism 50 includes a second planetary gear 51 and a third planetary gear 52. The second planetary gear 51 has a second sun gear 511, a second fixed gear ring 512, a second planet carrier 513 and a second planetary gear 514. The second input part is the second sun gear 511. The second fixed gear ring is integrally formed on the inner wall of the end cover 22. The second sun gear 511 is meshed with the second planetary gear 514. The second planetary gear 514 is meshed with the second fixed gear ring 512. The second planetary gear 514 is installed on the second planet carrier 513. The second planet carrier 513 is rotatable. When the second sun gear 511 drives the second planetary gear 514 to rotate, the second planetary gear 514 moves circumferentially along the second fixed gear ring 512, thereby driving the second planet carrier 513 to rotate. The rotation speed of the second planet carrier 513 is lower than that of the second sun gear 513.

[0044] The third planetary gear 52 comprises a third sun gear 521, a third planetary gear 524, a third fixed gear ring 522, a third planet carrier 523 and a movable gear ring 525. The second planet carrier 513 is connected to the third sun gear 521 so that the second planet carrier 513 and the third sun gear 521 rotate synchronously. The third sun gear 521 is meshed with the third planetary gear 524. The third planetary gear 524 is mounted on the third planet carrier 523. The third planet carrier 523 is rotatable. The third fixed gear ring 522 is integrally formed on the inner wall of the end cover 22. The movable gear ring 525 is rotatably arranged in the end cover 22. The movable gear ring 525 is rotatably arranged with the third planetary gear 524. The inner wall of the end cover 22 is in sliding contact, and the third planetary gear 524 is meshed with the third fixed gear ring 522 and the movable gear ring 525 at the same time. When the third sun gear 521 drives the third planetary gear 524 to rotate, the third planetary gear 524 moves circumferentially along the third fixed gear ring 522, thereby driving the third planet carrier 523 to rotate. At the same time, since the third planetary gear 524 is also meshed with the movable gear ring 525, the rotation of the third planetary gear 524 will also drive the movable gear ring 525 to rotate, and the movable gear ring 525 can drive the winch drum 20 to rotate. The rotation speed of the movable gear ring 525 is lower than that of the third sun gear 521, and the second output part is the movable gear ring 525.

[0045] Since the movable gear ring 525 is in sliding contact with the inner wall of the end cover 22 , the movable gear ring 525 drives the hoisting drum 20 to rotate more smoothly. Even if the hoisting drum 20 is subjected to a large pulling force from the object to be towed, the movable gear ring 525 will not be deformed to affect its rotation.

[0046] The transmission shaft 60 passes through the second reduction mechanism 50, one end of the transmission shaft 60 is connected to the first planetary carrier 33, the other end of the transmission shaft 60 is rotatably connected to the inner wall of the end cover 22 through a bearing 221, and the transmission shaft 60 is connected to the second sun gear 511. The transmission shaft 60 is used to transmit the rotational driving force of the first planetary carrier 33 to the second sun gear 511, so that the first planetary carrier 33 and the second sun gear 511 rotate synchronously.

[0047] The third fixed gear ring 522 is clamped and fixed on the inner wall of the end cover 22 to limit the rotation of the third fixed gear ring 522 relative to the end cover 22. A plurality of circumferentially spaced clamping grooves 5221 are provided on the outer peripheral wall of the third fixed gear ring 522, and a plurality of clamping blocks are provided on the inner wall of the end cover 22. The clamping blocks are clamped in the clamping grooves 5221 one by one, so that the third fixed gear ring 522 and the end cover 22 are circumferentially limited. The third fixed gear ring 522 in this embodiment is an independent component. After the third fixed gear ring 522 is processed, it is assembled into the end cover 22, so that the product quality and performance of the third fixed gear ring 522 can be better guaranteed.

[0048] A gear portion 23 is fixedly provided at one end of the hoisting drum 20, and a movable gear ring 525 is sleeved on the gear portion 23. The movable gear ring 525 and the gear portion 23 are coaxially arranged and mesh with each other, so that the movable gear ring 525 can drive the hoisting drum 20 to rotate synchronously through the gear portion 23, which simplifies the connection structure between the movable gear ring 525 and the hoisting drum 20.

[0049] The second reduction mechanism 50 of the electric traction device of the present embodiment is transmitted in the direction close to the hoisting drum 20, so that the movable gear ring 525 can be directly connected to the hoisting drum 20, and the end of the hoisting drum 20 does not need to be lengthened, and the first reduction mechanism 30 and the motor 40 are arranged in the hoisting drum 20, making full use of the internal space of the hoisting drum 20, so that the first reduction mechanism 30 and the motor 40 will not increase the overall volume of the electric traction device. In this way, the electric traction device of the present embodiment has a compact structure and a small volume.

[0050] A positioning sleeve 163, a first spring 161 and a pressure plate 162 are installed at the part of the traction rope 16 close to the second hook 20. The first spring 161 is located between the pressure plate 162 and the positioning sleeve 163. The positioning sleeve 163 is fixedly connected to the traction rope 16. The positioning sleeve 163 is closest to the second hook 20. The pressure plate 162 and the traction rope 16 can slide relative to each other. One end of the first spring 161 is against the positioning sleeve 163, and the other end of the first spring 161 is against the first surface of the pressure plate 162. The winch drum 20 is arranged in the shell 10, and a mounting plate 18 is arranged on the outer side of the shell 10. A first switch 181 is arranged on the mounting plate 18.

[0051] When the winch drum 20 rotates to reel all the traction rope 16 onto the winch drum 20, the positioning sleeve 163 applies force to the pressure plate 162 through the first spring 161 so that the second surface of the pressure plate 162 contacts the first switch 181, and the first switch 181 is triggered. The first switch 181 sends a signal to stop the motor 40 from rotating in the current direction. At this time, the motor 40 can only be operated by controlling the motor 40 to rotate in the reverse direction, which makes it possible for the motor 40 to stop working in time after the traction rope 16 is completely reeled onto the winch drum 20.

[0052] One end of the rod 164 is pivotally connected to the second load-bearing plate 14, and the other end of the rod 164 is movably arranged on the first load-bearing plate 13. The first load-bearing plate 13 is provided with a second spring 166 and a second switch 165. The second spring 166 is connected to the rod 164. The second spring 166 applies a force to the rod 164 to separate the rod 164 from the second switch 165, and the traction rope 16 passes under the rod 164.

[0053] When the hoisting drum 20 rotates to release the traction rope 16 from the hoisting drum 20, if the traction rope 16 is reversely wound onto the hoisting drum 20, the traction rope 16 lifts the rod 164 upward so that the rod 164 triggers the second switch 165, and the second switch 165 sends a signal to stop the motor 40 from rotating in the current direction. At this time, the motor 40 can only work by controlling the motor 40 to rotate in the reverse direction, which can prevent the traction rope 16 from being reversely wound onto the hoisting drum 20.

[0054] The power source of the motor 40 is a lithium battery pack, alternating current, a direct current battery or a supercapacitor battery.

[0055] The electric traction device also includes a display screen, which is used to display the load of the traction rope, the rope-releasing state of the winch drum, the rope-retracting state of the winch drum or a fault code.

[0056] The electric traction device is provided with a controller, and the electric traction device is controlled by the controller, or the electric traction device adopts wired remote control or wireless remote control.

[0057] The electric traction device also has functions such as rectification, overcurrent protection, overheat protection, short circuit protection, fuse current protection, and electromagnetic braking, which greatly improves the safety of the electric traction device.

[0058] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0060] This specification and drawings are merely exemplary illustrations of the present application and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application intends to include these modifications and variations.

Claims

1. An electric traction device, characterized in that: include: winch; A first reduction mechanism is located in the hoisting drum, the first reduction mechanism has a first input part, a first output part and a first reduction assembly, the first reduction assembly reduces the rotation speed of the rotation driving force input to the first input part to a specified speed and then outputs it from the first output part; a driving component, at least partially disposed within the hoisting drum, the driving component being connected to the first input portion and configured to generate a rotational driving force for rotating the first input portion; a second reduction mechanism, located at one end of the hoisting drum, the second reduction mechanism having a second input portion, a second output portion, and a second reduction assembly, the second output portion being located between the second input portion and the hoisting drum, the second output portion being connected to the hoisting drum, the second output portion rotating synchronously with the hoisting drum, the second reduction assembly reducing the rotational speed of the rotational driving force input to the second input portion to a specified speed and then outputting it from the second output portion; The transmission shaft passes through the second reduction mechanism and is used to transmit the rotational driving force of the first output part to the second input part.

2. The electric traction device according to claim 1, characterized in that: A cylindrical component is arranged in the hoisting cylinder, and a first reduction mechanism is arranged in the cylindrical component. The first reduction mechanism includes a first planetary gear, and the first planetary gear has a first sun gear, a first fixed gear ring and a first planet carrier. The first input part is the first sun gear, the first output part is the first planet carrier, and the first fixed gear ring is arranged on the inner wall of the cylindrical component.

3. The electric traction device according to claim 1, characterized in that: An end cover is fixedly provided at one end of the hoisting drum, and a second reduction mechanism is provided in the end cover. The second reduction mechanism comprises a second planetary gear and a third planetary gear. The second planetary gear comprises a second sun gear, a second fixed gear ring and a second planet carrier. The second input part is the second sun gear, and the second fixed gear ring is provided on the inner wall of the end cover. The third planetary gear comprises a third sun gear, a third planetary gear, a third fixed gear ring, a third planet carrier and a movable gear ring. The second planet carrier is connected to the third sun gear. The third fixed gear ring is arranged on the inner wall of the end cover. The movable gear ring is rotatably arranged in the end cover. The third planetary gear is meshed with the third fixed gear ring and the movable gear ring at the same time. The movable gear ring drives the winch drum to rotate. The second output part is the movable gear ring.

4. The electric traction device according to claim 3, characterized in that: The third fixed gear ring is clamped and fixed on the inner wall of the end cover to limit the rotation of the third fixed gear ring relative to the end cover.

5. The electric traction device according to claim 3, characterized in that: A gear portion is arranged at one end of the hoisting drum, and the movable gear ring is coaxially arranged with the gear portion and meshes with each other.

6. The electric traction device according to claim 1, characterized in that: A traction rope is wound on the hoisting drum, one end of the traction rope is fixed on the hoisting drum, the other end of the traction rope is a free end, the free end of the traction rope is connected to a second hook, the second hook is used to hook the object to be towed, a positioning sleeve, a first spring and a pressure plate are sleeved on the part of the traction rope close to the second hook, the first spring is located between the pressure plate and the positioning sleeve, the positioning sleeve is fixedly connected to the traction rope and is closest to the second hook, the pressure plate and the traction rope can slide relatively, one end of the first spring is against the positioning sleeve, the other end of the first spring is against the first surface of the pressure plate, the hoisting drum is arranged in the shell, and a first switch is arranged on the outer side of the shell; When the hoisting drum rotates to reel all the traction ropes onto the hoisting drum, the positioning sleeve applies force to the pressure plate through the first spring so that the second surface of the pressure plate contacts the first switch, and the first switch sends a signal to stop the driving component from working.

7. The electric traction device according to claim 6, characterized in that: The housing is provided with a first load-bearing plate and a second load-bearing plate, the first load-bearing plate and the second load-bearing plate are connected to each other through a plurality of connecting shafts, the winch drum is located between the first load-bearing plate and the second load-bearing plate, the two ends of the winch drum are respectively rotatably connected to the first load-bearing plate and the second load-bearing plate, one end of a rod is pivotally connected to the second load-bearing plate, the other end of the rod is movably arranged on the first load-bearing plate, the first load-bearing plate is provided with a second spring and a second switch, the second spring is connected to the rod to separate the rod from the second switch, and the traction rope passes under the rod; When the hoisting drum rotates to release the traction rope from the hoisting drum, if the traction rope is reversely wound onto the hoisting drum, the traction rope lifts the rod upward so that the rod triggers the second switch, and the second switch sends a signal to stop the driving component.

8. The electric traction device according to claim 1, characterized in that: The power source of the driving component adopts a lithium battery pack, alternating current, a direct current battery or a supercapacitor battery.

9. The electric traction device according to claim 1, characterized in that: The electric traction device also includes a display screen, which is used to display the load of the traction rope, the rope-releasing state of the winch drum, the rope-retracting state of the winch drum or a fault code.

10. The electric traction device according to claim 1, characterized in that: The electric traction device is provided with a controller, and the electric traction device is controlled by the controller, or the electric traction device adopts wired remote control or wireless remote control.

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