CN210904917U - Roller skating device - Google Patents

Abstract

The utility model provides a skidding device, include: a wheel carrier; the pulley assembly is arranged on the wheel carrier and comprises a plurality of pulleys, and at least one pulley is an electric pulley; the detection mechanism is arranged on the wheel carrier and used for detecting whether the electric pulley is in contact with the ground or not; and when the detection mechanism detects that the electric pulley is not in contact with the ground, the detection mechanism transmits a detection signal to the control mechanism so as to control the motor of the electric pulley to stop driving through the control mechanism. Through the technical scheme provided by the utility model, can solve the relatively poor technical problem of the wheel skidding device duration among the prior art.

Description

Roller skating device

Technical Field

The utility model relates to a skidding device technical field particularly, relates to a skidding device.

Background

At present, the roller skate can be used as an entertainment and sports tool to play the interest of the roller skate; meanwhile, the walking aid can be used as a walking aid, and the practicability is realized. In the prior art, the roller skates require a user to use two feet to alternately pedal backwards to obtain forward power, which requires the user to consume more physical strength, so that various electric roller skates appear in the market to help the user to save labor.

However, the hub motor of the electric roller skate in the prior art can continue to rotate when not contacting with the ground, which wastes unnecessary electric energy and causes the endurance to be very limited.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a roller skating device to solve the relatively poor technical problem of endurance of the roller skating device in the prior art.

In order to achieve the above object, the present invention provides a roller skate apparatus, including: a wheel carrier; the pulley assembly is arranged on the wheel carrier and comprises a plurality of pulleys, and at least one pulley is an electric pulley; the detection mechanism is arranged on the wheel carrier and used for detecting whether the electric pulley is in contact with the ground or not; and when the detection mechanism detects that the electric pulley is not in contact with the ground, the detection mechanism transmits a detection signal to the control mechanism so as to control the motor of the electric pulley to stop driving through the control mechanism.

Further, the roller device further includes: the bracket is movably arranged on the wheel carrier, the electric pulley is arranged on the bracket, the bracket is provided with an initial position and a grounding position, and when the bracket is at the initial position, the electric pulley is arranged to protrude out of the pulley; when the bracket is in a ground contact position, the electric pulley is in contact with the ground; the detection mechanism is used for detecting the position of the support to judge whether the electric pulley is in contact with the ground or not.

Further, the roller device further includes: and the resetting piece is arranged between the bracket and the wheel carrier so as to push the bracket to be restored to the initial position through the resetting piece when the electric pulley is separated from the ground.

Further, the stand is rotatably provided on the wheel frame to detect that the stand is in the initial position or the ground contact position by the detection mechanism.

Further, the support includes first support body, second support body and link plate group, and first support body and second support body interval set up, and link plate group sets up between first support body and second support body, and at least part of electric pulley sets up the clearance department between first support body and second support body, and electric pulley's motor shaft wears to establish on first support body and second support body, and detection mechanism sets up on at least part of link plate group.

Furthermore, the first frame body and the second frame body respectively comprise a first support arm and a second support arm, one end of the first support arm is rotatably arranged on the wheel carrier, the other end of the first support arm is connected with a motor shaft of the electric pulley, and the first support arm and the second support arm are connected and arranged in a first preset angle; the connecting plate set comprises a first connecting plate and a second connecting plate, the first connecting plate is arranged between the two first supporting arms, the second connecting plate is arranged between the two second supporting arms, the second connecting plate is located above the first connecting plate, and the detection mechanism is arranged on the second connecting plate.

Further, the roller device further includes: the swing shaft is arranged on the wheel frame, and the bracket is arranged on the swing shaft in a penetrating way so as to enable the bracket to swing around the swing shaft.

Further, the roller device further includes: the reset torsion spring is sleeved on the swinging shaft, one end of the reset torsion spring is connected with the wheel carrier, and the other end of the reset torsion spring is connected with the first connecting plate so as to reset the electric pulley through the action of the reset torsion spring on the support.

Furthermore, the support can be rotationally arranged on the wheel carrier, the electric pulleys are multiple, the support comprises multiple support arms, the support arms are connected and arranged, the electric pulleys and the support arms are arranged in a one-to-one correspondence mode, and the electric pulleys are arranged on the corresponding support arms.

Further, the stand is slidably provided on the wheel frame to detect that the stand is at the initial position or the ground contact position by a detection mechanism.

Furthermore, the roller skating device further comprises a return spring, one end of the return spring is connected with the support, and the other end of the return spring is connected with the wheel carrier, so that the return spring resets the electric pulley through the support.

Further, the detection mechanism is a distance measuring sensor to detect whether the electric pulley is in contact with the ground through the distance measuring sensor.

Use the technical scheme of the utility model, through set up detection mechanism on the wheel carrier, when detection mechanism detected electric pulley not with the ground contact, detection mechanism transmitted the signal that detects to control mechanism to through the motor stall of control mechanism control electric pulley, thereby avoided extravagant unnecessary electric energy, increased the duration of skidding device. Therefore, through the utility model provides a technical scheme can solve the relatively poor technical problem of skidding device duration among the prior art.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a roller skating device according to a first embodiment of the present invention;

fig. 2 shows a front view of a roller skate according to a first embodiment of the present invention;

fig. 3 shows a rear view of a roller skate according to a first embodiment of the present invention;

fig. 4 shows a schematic structural diagram of a wheel carrier, a bracket and a pulley assembly of the roller skating device according to the first embodiment of the present invention;

FIG. 5 shows a view from the direction A-A in FIG. 4;

fig. 6 is an exploded view of a partial structure of a roller skate according to a first embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a wheel frame, a bracket and a pulley assembly of the roller skating device according to the second embodiment of the present invention;

fig. 8 shows a front view of fig. 7.

Wherein the figures include the following reference numerals:

10. a wheel carrier; 20. a sheave assembly; 21. a pulley; 22. an electric pulley; 30. a detection mechanism; 40. a support; 41. a first support arm; 42. a second support arm; 43. a first connecting plate; 44. a second connecting plate; 50. a reset member; 60. a shoe body; 70. a swing shaft.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 6, a first embodiment of the present invention provides a roller skating device, which includes a wheel frame 10, a pulley assembly 20 and a control mechanism. The pulley assembly 20 is disposed on the wheel frame 10, the pulley assembly 20 includes a plurality of pulleys 21, and at least one pulley 21 is an electric pulley 22. The detection mechanism 30 is provided on the wheel frame 10 to detect whether the motorized pulley 22 is in contact with the ground by the detection mechanism 30. The detection mechanism 30 is connected with the control mechanism, and when the detection mechanism 30 detects that the electric pulley 22 is not in contact with the ground, the detection mechanism 30 transmits a detection signal to the control mechanism so as to control the motor of the electric pulley 22 to stop driving through the control mechanism.

By adopting the roller skating device provided by the embodiment, when the detection mechanism 30 detects that the electric pulley 22 is not in contact with the ground, the control mechanism controls the motor of the electric pulley 22 to stop rotating, so that the condition that the electric pulley 22 still rotates when a user lifts the foot is avoided, and unnecessary electric energy waste is avoided. Under the limited volume, the electric power-assisted roller skating device is realized, and the cruising ability of the roller skating device is increased. Therefore, through the technical scheme that this embodiment provided, can solve the relatively poor technical problem of endurance of the skidding device among the prior art.

In order to better detect whether the electric pulley 22 in the roller skating device is separated from the ground, the roller skating device in this embodiment further includes a bracket 40, the bracket 40 is movably disposed on the wheel frame 10, and the electric pulley 22 is disposed on the bracket 40. Specifically, the bracket 40 in this embodiment has an initial position and a ground contact position, and when the bracket 40 is in the initial position, the electric pulley 22 is disposed to protrude from the pulley 21, and at this time, the electric pulley 22 is not in contact with the ground. When the stand 40 is in the ground contacting position, the motorized pulley 22 is in contact with the ground. The detecting mechanism 30 may be a position detecting sensor (depending on the movement of the stand 40 on the wheel frame 10, the position detecting sensor may be a sensor for detecting the rotation angle or a displacement sensor, etc.), and the detecting mechanism 30 is used for detecting the position of the stand 40 to determine whether the electric pulley 22 is in contact with the ground. By adopting the structure, whether the electric pulley 22 is in contact with the ground or not can be obtained by detecting the position of the bracket 40, and the position of the bracket 40 can be changed, so that the detection can be convenient, the position of the electric pulley 22 can be judged more accurately, and the working condition of the electric pulley 22 can be controlled better.

In this embodiment, the roller skate apparatus further includes a restoring member 50, and the restoring member 50 is disposed between the stand 40 and the wheel frame 10 to push the stand 40 to be restored to the original position by the restoring member 50 when the power pulley 22 is disengaged from the ground. With such an arrangement, when a user lifts his foot, the electric pulley 22 is separated from the ground, the reset piece 50 pushes the bracket 40 to be restored to the initial position, the detection mechanism 30 detects the position of the bracket 40 and then transmits a signal to the control mechanism, and the control mechanism controls the electric pulley 22 to stop rotating (specifically, the control mechanism can control to stop providing a power source for the electric pulley 22), so that the waste of electric energy is avoided, and the cruising ability of the roller skating device is increased.

Specifically, the stand 40 may be rotatably provided on the wheel frame 10 to detect the rotational position of the stand 40 by the detection mechanism 30 to determine whether the motorized pulley 22 is in contact with the ground, specifically, the detection mechanism 30 is used to detect that the stand 40 is in the initial position or the ground contact position. With the arrangement, the detection mechanism 30 can conveniently detect the position of the electric pulley 22, so as to accurately judge the position of the electric pulley 22 and further accurately control the working condition of the motor of the electric pulley 22, so as to provide a power source for the motor of the electric pulley 22 when the electric pulley 22 contacts the ground; when the motor-driven pulley 22 is not in contact with the ground, the supply of the power source to the motor of the motor-driven pulley 22 is stopped to stop the rotation of the motor-driven pulley 22.

In this embodiment, the support includes first support body, second support body and connection plate group, and first support body and second support body interval set up, first support body and second support body parallel arrangement, and connection plate group sets up between first support body and second support body. At least part of the electric pulley 22 is arranged at the gap between the first frame body and the second frame body, and a motor shaft of the electric pulley 22 is arranged on the first frame body and the second frame body in a penetrating way, so that the electric pulley 22 is stably arranged on the bracket 40, and the arrangement stability of the electric pulley 22 is improved. In the present embodiment, the detection mechanism 30 is disposed on at least a portion of the connection plate group, so as to improve the stability of the arrangement of the detection mechanism 30, so that the detection mechanism 30 can accurately detect the position of the bracket 40. With such an arrangement, the first frame body and the second frame body can be stably connected together through the connecting plate group, so that the connection stability of the first frame body and the second frame body is improved, and the overall strength of the support 40 is enhanced. Specifically, the first frame, the second frame and the connecting plate in this embodiment form a bracket 40 having a U-shaped structure.

Specifically, the first frame body and the second frame body may have the same structure or different structures. In this embodiment, the first frame body and the second frame body each include a first arm 41 and a second arm 42, one end of the first arm 41 is rotatably disposed on the wheel frame 10, the other end of the first arm 41 is connected to the motor shaft of the electric pulley 22, and the first arm 41 and the second arm 42 are connected to each other at a first predetermined angle. The connection plate set includes a first connection plate 43 and a second connection plate 44, the first connection plate 43 is disposed between the two first arms 41, the second connection plate 44 is disposed between the two second arms 42, the second connection plate 44 is located at one end of the second arm 42 far from the first arm 41, the second connection plate 44 is located above the first connection plate 43, and the detection mechanism 30 is disposed on the second connection plate 44. The strength of the whole bracket 40 can be better enhanced through the first connecting plate 43 and the second connecting plate 44, and the reinforcing effect is achieved. With the roller-skating device of the present embodiment, when the electric pulley 22 is not in contact with the ground, the electric pulley 22 is protruded from the other pulleys 21 of the pulley assembly 20, and when the user operates the roller-skating device to move to the ground, the electric pulley 22 preferentially contacts with the ground, and finally the electric pulley 22 moves to the ground contact position, at which time, the other pulleys 21 of the pulley assembly 20 all contact with the ground. After the detection mechanism 30 on the second arm 42 detects that the motorized pulley 22 is in the contact position, a power source is provided to the motorized pulley 22 through the control mechanism so as to rotate the motorized pulley 22.

Specifically, the detecting mechanism 30 in this embodiment may be a contact switch, and when the roller device contacts the ground, the power-driven roller 22 rotates to a position where the contact switch contacts with the bottom of the shoe body 60, so that the contact switch is turned on; when the roller device is lifted off the ground, the power-driven pulley 22 is rotated to a position where the contact switch is separated from the bottom of the shoe body 60, so that the contact switch is turned off. The position of the pulley device can be detected by switching on and off the contact switch, so that the control mechanism can control the working state of the motor of the electric pulley 22.

In the present embodiment, the roller device further includes a swing shaft 70, the swing shaft 70 is disposed on the wheel frame 10, and the bracket 40 is inserted on the swing shaft 70 to swing the bracket 40 around the swing shaft 70. With this arrangement, by adding the swing shaft 70, the swing of the stand 40 can be facilitated to increase the flexibility of the movement of the stand 40.

Specifically, the roller skate further includes a return torsion spring, and the return torsion spring in this embodiment is a return element 50. The reset torsion spring is sleeved on the swing shaft 70, one end of the reset torsion spring is connected with the wheel carrier 10, the other end of the reset torsion spring is connected with the bracket 40, and specifically, the other end of the reset torsion spring is connected with the first connecting plate 43 so as to reset the electric pulley 22 through the action of the reset torsion spring on the bracket 40. With the arrangement, the electric pulley 22 can be better reset, so that the electric pulley 22 can be timely reset to the initial position when lifting the foot, and the detection mechanism 30 can detect the position of the electric pulley 22 to control the working condition of the electric pulley 22.

Specifically, the pulley assembly 20 in this embodiment includes four pulleys 21, one of the four pulleys 21 is a power pulley 22, the four pulleys 21 are arranged in a row, and the power pulley 22 is located at the second or third position. The electric pulley 22 is driven by a driving mode of the in-wheel motor, and for convenience of control, the in-wheel motor is started by a pedaling starting mode in the embodiment, a user pedals with small force, and the in-wheel motor is in an auxiliary mode, so that labor is saved and electric energy is saved. During the pedaling process, a user can lift the foot, when the user lifts the foot, the electric pulley 22 rotates under the action of the reset torsion spring, the detection mechanism 30 (the detection mechanism 30 can be a sensor, and specifically can be a contact switch, an infrared switch and other structures) senses and sends a signal to the control mechanism (the control mechanism can be a control panel), the control panel enables the hub motor not to work, and the electric energy is saved when the user's foot falls to the ground to pedal the foot.

As shown in fig. 7 and 8, a second embodiment of the present invention provides a roller skate apparatus, and the difference between the second embodiment and the first embodiment lies in the difference of the structure of the bracket 40. In this embodiment, the supporting frame 40 is rotatably disposed on the wheel frame 10, the electric pulleys 22 are plural, the supporting frame 40 includes plural supporting arms, the plural supporting arms are connected to each other, the plural electric pulleys 22 are disposed in one-to-one correspondence with the plural supporting arms, and each electric pulley 22 is disposed on the corresponding supporting arm. Specifically, the plurality of pulleys 21 may form a single row structure of the pulley assembly 20; alternatively, the plurality of pulleys 21 may form the pulley assembly 20 in a multi-row structure, which can facilitate improving the operation stability of the roller device; or, the plurality of pulleys 21 may be arranged in an arrangement form of one front wheel and two rear wheels, which can also facilitate to improve the operation stability of the roller skating device; alternatively, the plurality of pulleys 21 may be arranged in an arrangement of two front wheels and one rear wheel, which also facilitates to improve the operation stability of the roller skate apparatus.

Specifically, the number of the electric pulleys 22 in this embodiment may be two, and the support 40 includes two support arms, the two support arms are connected at a second predetermined angle, and the connection ends of the two support arms are rotatably disposed on the wheel frame 10. Specifically, the two support arms may be in a V-shaped structure, and the two electric pulleys 22 are respectively disposed on two legs of the V-shaped structure, rotate with the tip angle on the head as a rotation axis, and reset by a reset torsion spring. When the pulley is not touching the ground, the motorized pulley 22 on one arm will be located above the other pulley 21 of the pulley assembly 20 and the motorized pulley 22 on the other arm will be located below the other pulley 21 of the pulley assembly 20. When the skate is touching the ground, the bracket 40 rotates so that both motorized pulleys 22 are in contact with the ground.

Specifically, the detection mechanism 30 in this embodiment may be a contact switch, and when the user lifts his foot, the electric pulley 22 is pushed to rotate under the action of the return torsion spring, so as to open and close the contact switch. The contact switch in this embodiment is arranged on the wheel carrier 10, when the roller device is not contacted with the ground, one of the electric pulleys 22 is contacted with the contact switch to make the contact switch connected; when the pulley is in contact with the ground, the motorized pulley 22 disengages the contact switch to cause the contact switch to open. With the roller skating device provided by this embodiment, when lifting the foot, the electric pulley 22 is pushed to rotate to a position where the electric pulley 22 contacts with the contact switch under the action of the reset torsion spring, the contact switch transmits the signal to the control mechanism, and the control mechanism controls the motor (here, the motor is mainly a hub motor) of the electric pulley 22 to stop working.

The third embodiment of the present invention provides a roller skating device, and the difference between the third embodiment and the second embodiment lies in the difference of the moving mode of the bracket 40, the difference of the structure of the bracket 40 and the difference of the reset piece 50. In the present embodiment, the stand 40 is slidably disposed on the wheel frame 10 to detect the moving position of the stand 40 by the detecting mechanism 30 to determine whether the motorized pulley 22 is in contact with the ground, and specifically, the detecting mechanism 30 is used to detect that the stand 40 is in the initial position or the ground contact position.

In this embodiment, the roller device further includes a return spring, one end of the return spring is connected to the bracket 40, and the other end of the return spring is connected to the wheel carrier 10, so that the return spring returns the electric pulley 22 through the bracket 40, and the return spring may be a compression spring. Specifically, an elongated hole may be formed in the wheel carrier 10, and a return spring is disposed in the elongated hole, so that the electric pulley 22 can move up and down by a compression spring, and the position of the electric pulley 22 is detected by the detection mechanism 30. Specifically, the detection mechanism 30 in this embodiment may also be a contact switch, and the electric pulley 22 is moved up and down by a pressure spring, so that the contact switch is opened and closed.

The embodiment of the utility model provides a fourth provides a skidding device, and this skidding device includes wheel carrier 10, loose pulley assembly 20, control mechanism and detection mechanism 30. The pulley assembly 20 in this embodiment is disposed on the wheel frame 10, and the pulley assembly 20 includes a plurality of pulleys 21, and at least one pulley 21 is a power pulley 22. The detection mechanism 30 is provided on the wheel frame 10 to detect whether the motorized pulley 22 is in contact with the ground by the detection mechanism 30. The detection mechanism 30 is connected with the control mechanism, and when the detection mechanism 30 detects that the electric pulley 22 is not in contact with the ground, the detection mechanism 30 transmits a detection signal to the control mechanism so as to control the electric pulley 22 to stop rotating through the control mechanism. Specifically, the detection mechanism 30 in the present embodiment is a distance measuring sensor to detect whether the electric pulley 22 is in contact with the ground surface. Specifically, the distance measuring sensor in this embodiment may be a sensor such as an infrared sensor, a laser sensor, or an ultrasonic sensor, and detects whether the electric pulley 22 is lifted off the ground or not through the distance measuring sensor, and when the distance measuring sensor detects that the electric pulley 22 is lifted off the ground, the distance measuring sensor transmits a signal to the controller, so as to control the hub motor of the electric pulley 22 to stop working through the controller.

The embodiment of the utility model provides a fifth provides a skidding device, this skidding device's wheel carrier 10 is whole rotationally sets up, can use the preceding fulcrum of wheel carrier 10 as the rotation point, when lifting the foot, promotes wheel carrier 10 through the torsional spring and rotates to realize opening and shutting of contact switch.

The embodiment of the utility model provides a sixth provides a skidding device, this skidding device's wheel carrier 10 is whole rotationally to be set up, when lifting the foot, promotes wheel carrier 10 through the pressure spring and reciprocates to realize opening and shutting of contact switch.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the user only needs to pedal with small force, and the electric pulley assists in driving, so that labor can be saved; meanwhile, when a user lifts the foot, the control mechanism can control the motor of the electric pulley to stop working, so that the electric energy is saved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A roller skate apparatus, comprising:

a wheel carrier (10);

the pulley assembly (20) is arranged on the wheel carrier (10), the pulley assembly (20) comprises a plurality of pulleys (21), and at least one pulley (21) is an electric pulley (22);

a detection mechanism (30) arranged on the wheel carrier (10) to detect whether the electric pulley (22) is in contact with the ground or not through the detection mechanism (30);

and the detection mechanism (30) is connected with the control mechanism, and when the detection mechanism (30) detects that the electric pulley (22) is not in contact with the ground, the detection mechanism (30) transmits a detection signal to the control mechanism so as to control the motor of the electric pulley (22) to stop driving through the control mechanism.

2. A roller skate as defined in claim 1 further comprising:

the bracket (40) is movably arranged on the wheel carrier (10), the electric pulley (22) is arranged on the bracket (40), the bracket (40) has an initial position and a ground contact position, and when the bracket (40) is at the initial position, the electric pulley (22) is arranged to protrude out of the pulley (21); when the stand (40) is in the ground-contacting position, the motorized pulley (22) is in contact with the ground; the detection mechanism (30) is used for detecting the position of the bracket (40) to judge whether the electric pulley (22) is in contact with the ground or not.

3. A roller skate as defined in claim 2 further comprising:

a restoring member (50) disposed between the stand (40) and the wheel frame (10) to push the stand (40) to restore to an initial position by the restoring member (50) when the power pulley (22) is disengaged from the ground.

4. A pulley device according to claim 2, characterized in that said yoke (40) is rotatably provided on said wheel carrier (10) to detect that said yoke (40) is in said initial position or said ground contact position by said detecting means (30).

5. A pulley device according to claim 2, characterized in that the support (40) comprises a first support body, a second support body and a connecting plate group, the first support body and the second support body are arranged at intervals, the connecting plate group is arranged between the first support body and the second support body, at least part of the electric pulley (22) is arranged at a gap between the first support body and the second support body, a motor shaft of the electric pulley (22) is arranged on the first support body and the second support body in a penetrating manner, and the detecting mechanism (30) is arranged on at least part of the connecting plate group.

6. A roller skating device as claimed in claim 5, wherein the first frame body and the second frame body each include a first arm (41) and a second arm (42), one end of the first arm is rotatably provided on the wheel frame (10), the other end of the first arm is connected with a motor shaft of the electric pulley (22), and the first arm (41) and the second arm (42) are connected at a first preset angle; the connecting plate set comprises a first connecting plate (43) and a second connecting plate (44), the first connecting plate (43) is arranged between the two first support arms (41), the second connecting plate (44) is arranged between the two second support arms (42), the second connecting plate (44) is located above the first connecting plate (43), and the detection mechanism (30) is arranged on the second connecting plate (44).

7. A pulley device according to claim 6, characterized in that the pulley device further comprises:

the swinging shaft (70) is arranged on the wheel carrier (10), and the bracket (40) is arranged on the swinging shaft (70) in a penetrating way so as to enable the bracket (40) to swing around the swinging shaft (70).

8. A pulley device according to claim 7, characterized in that the pulley device further comprises:

the reset torsion spring is sleeved on the swinging shaft (70), one end of the reset torsion spring is connected with the wheel carrier (10), and the other end of the reset torsion spring is connected with the first connecting plate (43) so as to enable the electric pulley (22) to reset through the effect of the support (40).

9. A roller device according to claim 2, wherein said supporting frame (40) is rotatably provided on said wheel frame (10), said electric pulleys (22) are plural, said supporting frame (40) comprises a plurality of supporting arms, said plurality of supporting arms are connected, said plurality of electric pulleys (22) and said plurality of supporting arms are provided in one-to-one correspondence, and each of said electric pulleys (22) is provided on the corresponding supporting arm.

10. A pulley device according to claim 2, characterized in that said yoke (40) is slidably provided on said wheel frame (10) to detect that said yoke (40) is in said initial position or said ground contact position by said detecting mechanism (30).

11. A pulley device according to claim 10, characterized in that it further comprises a return spring, one end of which is connected to the stand (40) and the other end of which is connected to the wheel carrier (10), so that the return spring returns the motorized pulley (22) through the stand (40).

12. A pulley device according to claim 1, characterized in that said detection means (30) is a distance measuring sensor to detect whether said motorized pulley (22) is in contact with the ground surface or not by means of said distance measuring sensor.

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