Electric power-assisted wheelbarrow

Abstract

The invention discloses an electric power monocycle. The electric power monocycle comprises a frame, an electric connection assembly and a positioning assembly. A power supply box is arranged on the frame, the electric connection assembly is composed of a first electric connection terminal, a second electric connection terminal and a connecting piece used for connecting the first electric connection terminal and the second electric connection terminal, and a movable pawl, a positioning piece and a sliding piece are arranged in the positioning assembly. According to the electric power-assisted monocycle, the storage battery is arranged in the power supply box, so that the storage battery can be protected through the power supply box, and the storage battery cannot be directly impacted and damaged. And a pressing type structure is adopted for installation and unlocking, other auxiliary tools are not needed, the replacement efficiency can be improved, the replacement time is shortened, the replacement operation process is reduced, the electric single-wheel trolley can be put into use quickly, and the operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to electric vehicle technology, in particular to an electric power-assisted unicycle. Background Art

[0002] A wheelbarrow is a common means of transportation. Compared with ordinary multi-wheeled carts, wheelbarrows have a simple structure and a small size, so they are widely used in production and life, such as the warehousing industry, the construction industry, etc. Traditional wheelbarrows rely on manpower to pull or push, which has high labor intensity and low work efficiency. As a result, electric wheelbarrows came into being, which are powered by a drive motor.

[0003] In the current electric wheelbarrow, since the electric wheelbarrow needs to be used for a long time, it is impossible to have only one battery, and multiple batteries need to be charged and used in turn, so the battery needs to be removed and replaced with a new one. However, if a structure that requires tools such as bolts is used for installation, the time for replacing the battery will be greatly increased and the replacement efficiency will be reduced. Not only is it a waste of time, but the operation is also cumbersome. Long-term use of bolts will cause the bolts to slip, resulting in unstable battery fixation, which will cause the battery to become unstable and affect the use of the electric wheelbarrow. Summary of the invention

[0004] In order to solve the defects of the prior art mentioned above, the present invention provides an electric power-assisted unicycle.

[0005] The technical solution of the present invention is achieved in this way:

[0006] An electric power-assisted unicycle, characterized by comprising:

[0007] A vehicle frame, wherein a power supply box is provided on the vehicle frame, wherein the power supply box is composed of a box body, a cover body and a cover plate, wherein the cover body is arranged on the box body, wherein the cover plate is hinged to one end of the box body by a hinge, wherein an installation area is formed inside the box body, wherein a partition is arranged within the installation area, wherein the partition separates the installation area into a first area and a second area, wherein an electrical connection assembly is provided on the partition, wherein the electrical connection assembly is composed of a first electrical connection terminal, a second electrical connection terminal and a connector for connecting the first electrical connection terminal and the second electrical connection terminal, wherein the connector is arranged on the partition, wherein a first conductive member and a second conductive member are provided inside the connector,

[0008] A controller is provided in the first area, and the first electrical connection terminal is mounted on the controller.

[0009] and a storage battery arranged in the second area, the second electrical connection terminal being mounted on the storage battery, the battery being pushed into the first area, the second electrical connection terminal being kept electrically connected to the first electrical connection terminal through the first conductive member and the second conductive member in the connector,

[0010] Installation grooves are provided on both sides of the battery, and positioning components are provided in the installation grooves. The positioning components are composed of a movable pawl, a positioning member and a sliding member. The sliding member is installed on the positioning member, and the positioning member is arranged on the inner wall of the installation area. The positioning member is provided with multiple positioning teeth to push the battery and keep the battery driving the movable pawl to pass the sliding member and limit it at the positioning teeth on the positioning member.

[0011] In the present invention, a mounting portion is provided on the connector, and the connector is installed on the partition through the mounting portion. A movable hole is formed in the middle of the connector. A fixing member is provided on one end of the connector facing the first electrical connection terminal, and a through hole is formed in the middle of the fixing member. The first conductive member and the second conductive member are installed in the movable hole.

[0012] In the present invention, the fixing member is provided with a plurality of through holes, balls are provided in the through holes, a first sliding hole and an accommodating hole for accommodating the balls are provided in the middle of the first electrical connection terminal, a first blocking portion is provided on the first conductive member, a first spring is sleeved on the first conductive member, one end of the first spring is in contact with the first blocking portion, and the other end is in contact with the fixing member.

[0013] In the present invention, a second blocking portion is provided on the second conductive member, a second spring is sleeved on the second conductive member, one end of the second spring contacts the first blocking portion, and the other end contacts the second blocking portion, a second sliding hole is provided in the middle of the first conductive member, one end of the second conductive member is placed in the second sliding hole, a third sliding hole is provided on the connecting member, a fourth sliding hole is provided in the middle of the second electrical connection terminal, and the other end of the second conductive member passes through the third sliding hole and is placed in the fourth sliding hole of the second electrical connection terminal.

[0014] In the present invention, the elastic force of the first spring is smaller than the elastic force of the second spring.

[0015] In the present invention, the sliding member is provided with symmetrically arranged protruding blocks, the protruding blocks are provided with sliding parts, the positioning member is provided with sliding grooves matched with the sliding parts, and sliding areas are formed between the protruding blocks.

[0016] In the present invention, a fixing hole is provided on the sliding member, a third spring is provided in the fixing hole, one end of the third spring is placed in the fixing hole, and the other end contacts the inner wall of the installation area. An extension portion is provided on the sliding member, and the extension portion is used to block the movable pawl and keep the movable pawl rotating.

[0017] In the present invention, strip grooves communicating with the mounting grooves are further provided on both sides of the battery, and the strip grooves keep the positioning piece from sliding into the mounting grooves.

[0018] In the present invention, a first rod body and a second rod body are provided in the installation groove, the second rod body is located at the upper end of the first rod body, a fourth spring is sleeved on the first rod body, a rotating hole matching with the second rod body is provided on the movable pawl, the movable pawl is installed on the second rod body through the rotating hole, and the fourth spring lifts the movable pawl to keep it outside the second rod body.

[0019] In the present invention, a pushing block is provided on the inner wall of the rotating hole, and a first limiting body and a second limiting body are provided on the second rod body. One side of the first limiting body and the second limiting body forms a mounting groove, and the other side forms a rotation area. The pushing block is in the rotation area. An elastic member is provided on the second rod body, and the elastic member consists of a first elastic arm, a second elastic arm and an arc arm for connecting the first elastic arm and the second elastic arm. The first elastic arm is arranged in the mounting groove, and the second elastic arm is arranged in the rotation area and keeps in contact with the pushing block.

[0020] The electric power-assisted unicycle of the present invention has the following beneficial effects: the electric power-assisted unicycle can not only protect the battery by placing it in the power supply box, but also prevent it from being damaged by direct impact. Moreover, the installation and unlocking of the electric power-assisted unicycle adopts a push-type structure, which not only does not require the use of other auxiliary tools, but also improves the replacement efficiency, shortens the replacement time, and reduces the replacement operation process, which is conducive to the rapid use of the electric unicycle and improves the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the electric power-assisted unicycle of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0023] Figure 3 for Figure 1 Schematic diagram of the power supply box structure;

[0024] Figure 4 for Figure 3 Schematic diagram of the internal structure;

[0025] Figure 5 for Figure 4 Schematic diagram of the controller and battery structure in FIG.

[0026] Figure 6 for Figure 5 A top-down perspective view of

[0027] Figure 7 for Figure 6 A local enlarged view of point A in FIG.

[0028] Figure 8 for Figure 6 A local enlarged view of point B in FIG.

[0029] Fig. 9 It is a schematic diagram of the structure of the positioning component in the present invention;

[0030] Fig.10 for Fig. 9 Schematic diagram of the sliding member structure in FIG.

[0031] Fig.11 for Fig. 9 Schematic diagram of the movable pawl structure in FIG.

[0032] Fig.12 for Fig.11 A local enlarged view of point C in FIG.

[0033] Fig.13 It is a schematic diagram of the structure of the electrical connection terminal in the present invention;

[0034] Fig.14 for Fig.13 A top view of

[0035] Fig.15 for Fig.14 The cross-sectional view at DD in ;

[0036] Fig.16 for Fig.15 A partial enlarged view of point E in the figure.

[0037] In the figure: frame 1, controller 2, battery 3, hub motor 4, hopper 5, wheel 6, adjustment handle 7, power supply box 8, box body 9, cover body 10, cover plate 11, hinge 12, bottom plate 13, notch 14, installation area 15, partition 16, first area 17, second area 18, electrical connection assembly 19, first electrical connection terminal 20, second electrical connection terminal 21, connector 22, first conductive member 23, second conductive member 24, installation part 25, movable hole 26, fixing member 27, through hole 28, pushing end 29, tapered surface 30, ball 31, limit end 32, through hole 33, first sliding hole 34, accommodating hole 35, first blocking part 36, first spring 37, second blocking part 38 , second spring 39, second sliding hole 40, third sliding hole 41, fourth sliding hole 42, compression area 43, mounting groove 44, positioning assembly 45, movable pawl 46, positioning member 47, sliding member 48, positioning tooth 49, protruding block 50, sliding portion 51, sliding groove 52, sliding area 53, fixing hole 54, third spring 55, extension portion 56, second rod body 57, pushing block 58, second elastic arm 59, second limiting body 60, strip groove 61, first rod body 62, fourth spring 63, rotating hole 64, tooth end 65, first limiting body 66, rotating area 67, elastic member 68, first elastic arm 69, arc arm 70, arc mouth 71, arc area 72, tooth groove 73. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] like Figures 1 to 16 As shown, the electric power-assisted unicycle of the present invention comprises a frame 1, a controller 2 and a battery 3. The controller 2 is used to control and adjust the battery 3 and the hub motor 4. A hopper 5 is provided on the frame 1, a wheel 6 is provided at the front end of the frame 1, a hub motor 4 is provided in the middle of the wheel 6, and the battery 3 is connected to the hub motor 4 through the controller 2. An adjustment handle 7 is provided at the rear end of the frame 1 for controlling the hub motor 4.

[0040] The frame 1 is provided with a power supply box 8, which is composed of a box body 9, a cover body 10 and a cover plate 11. The cover body 10 is arranged on the box body 9, and the cover plate 11 is hinged to one end of the box body 9 through a hinge 12. A bottom plate 13 is arranged inside the box body 9, and a notch 14 for accommodating the hinge 12 is arranged on the bottom plate 13. The bottom plate 13 is arranged at the lower end of the battery 3.

[0041] An installation area 15 is formed inside the box 9, and a partition 16 is provided inside the installation area 15, and the partition 16 divides the installation area 15 into a first area 17 and a second area 18. An electrical connection assembly 19 is provided on the partition 16, and the electrical connection assembly 19 is composed of a first electrical connection terminal 20, a second electrical connection terminal 21, and a connector 22 for connecting the first electrical connection terminal 20 and the second electrical connection terminal 21. The connector 22 is installed on the partition 16, and a first conductive member 23 and a second conductive member 24 are provided inside the connector 22. The controller 2 is arranged in the first area 17, and the first electrical connection terminal 20 is installed on the controller 2.

[0042] The connector 22 is provided with a mounting portion 25, and the connector 22 is mounted on the partition 16 through the mounting portion 25. A movable hole 26 is formed in the middle of the connector 22, and a fixing member 27 is installed in the movable hole 26 by means of a thread. A fixing member 27 is provided at one end of the connector 22 facing the first electrical connection terminal 20, and a through hole 28 is formed in the middle of the fixing member 27, and a push end 29 of the first conductive member 23 is placed in the through hole 28. The first conductive member 23 and the second conductive member 24 are installed in the movable hole 26.

[0043] The first conductive member 23 has a push end 29 at one end close to the first electrical connection terminal 20 , and a conical surface 30 is provided on the push end 29 for pushing the ball 31 . A limit end 32 is provided on the push end 29 for limiting the position of the ball 31 .

[0044] The fixing member 27 is provided with a plurality of through holes 33, in which balls 31 are arranged, and the middle of the first electrical connection terminal 20 is provided with a first sliding hole 34 and a receiving hole 35 for receiving the balls 31. When the balls 31 are pushed by the tapered surface 30, the balls 31 enter the receiving hole 35 from the through holes 33. However, a part of the balls 31 is still in the through hole 28, and not all of them are in the receiving hole 35 and the through hole 33, so as to limit the position of the first conductive member 23.

[0045] A first blocking portion 36 is disposed on the first conductive member 23 . A first spring 37 is sleeved on the first conductive member 23 . One end of the first spring 37 contacts the first blocking portion 36 , and the other end contacts the fixing member 27 .

[0046] The second conductive member 24 is provided with a second blocking portion 38, and a second spring 39 is sleeved on the second conductive member 24. One end of the second spring 39 contacts the first blocking portion 36, and the other end contacts the second blocking portion 38. The elastic force of the first spring 37 is smaller than the elastic force of the second spring 39. When the second conductive member 24 is pushed by the second electrical connection terminal 21 on the storage battery 3, the first spring 37 is first kept compressed. When the storage battery 3 needs to be taken out, the storage battery 3 can be pushed again. At this time, the first spring 37 is compressed to the limit, so the storage battery 3 compresses the second spring 39, and the second spring 39 is kept compressed, and the second conductive member 24 slides in the second sliding hole 40.

[0047] A second sliding hole 40 is provided in the middle of the first conductive member 23, and one end of the second conductive member 24 is placed in the second sliding hole 40. A third sliding hole 41 is provided on the connecting member 22, and a fourth sliding hole 42 is provided in the middle of the second electrical connection terminal 21, and the other end of the second conductive member 24 passes through the third sliding hole 41 and is placed in the fourth sliding hole 42 of the second electrical connection terminal 21.

[0048] A compression region 43 is formed between the second electrical connection terminal 21 and the connection member 22 . The length of the compression region 43 is greater than the compression length of the first spring 37 plus the second spring 39 .

[0049] The battery 3 is arranged in the second area 18 , and the second electrical connection terminal 21 is installed on the battery 3 . The battery is pushed into the first area 17 , and the second electrical connection terminal 21 is kept electrically connected to the first electrical connection terminal 20 through the first conductive member 23 and the second conductive member 24 in the connector 22 .

[0050] The battery 3 is provided with mounting grooves 44 on both sides, and a positioning assembly 45 is provided in the mounting groove 44. The positioning assembly 45 is provided with a movable pawl 46, a positioning member 47 and a sliding member 48. The sliding member 48 is installed on the positioning member 47, and the positioning member 47 is arranged on the inner wall of the mounting area 15. The positioning member 47 is provided with a plurality of positioning teeth 49, which push the battery 3 and keep the battery 3 driving the movable pawl 46 to pass over the positioning teeth 49 on the positioning member 47 to limit the sliding member 48.

[0051] The sliding member 48 is provided with symmetrically arranged protruding blocks 50 , the protruding blocks 50 are provided with sliding parts 51 , the positioning member 47 is provided with sliding grooves 52 matched with the sliding parts 51 , and sliding areas 53 are formed between the protruding blocks 50 .

[0052] The sliding member 48 is provided with a fixing hole 54, and a third spring 55 is provided in the fixing hole 54. One end of the third spring 55 is placed in the fixing hole 54, and the other end is in contact with the inner wall of the mounting area 15. When the sliding member 48 can be taken out of the battery 3, it is pushed by the movable pawl 46 to slide in the sliding groove 52 and compress the third spring 55, so that the movable pawl 46 passes over the sliding member 48, thereby taking out the battery 3.

[0053] An extension 56 is provided on the sliding member 48, and the extension 56 is used to block the movable pawl 46 and keep the movable pawl 46 from rotating. When the battery 3 drives the movable pawl 46 to be installed, the movable pawl 46 will be blocked, so that the extension 56 restricts the movable pawl 46 from entering together with the battery 3. At this time, the movable pawl 46 is blocked, so it rotates around the second rod 57, and the push block 58 pushes the second elastic arm 59 to deform, so that the second elastic arm 59 approaches the second limiter 60.

[0054] Strip grooves 61 communicating with the mounting grooves 44 are further provided on both sides of the battery 3 , and the strip grooves 61 keep the positioning member 47 sliding into the mounting grooves 44 .

[0055] The first rod 62 and the second rod 57 are arranged in the installation groove 44. The second rod 57 is located at the upper end of the first rod 62. The first rod 62 is sleeved with a fourth spring 63. The fourth spring 63 lifts the movable pawl 46 to keep it outside the second rod 57. The distance between the first rod 62 and the second rod 57 is greater than the thickness of the movable pawl 46, which facilitates the installation of the movable pawl 46. During installation, the fourth spring 63 is compressed so that the upper end of the fourth spring 63 is lower than the highest point of the first rod 62, and then the movable pawl 46 is placed on the second rod 57, and the pressure on the fourth spring 63 is canceled to keep the fourth spring 63 against the movable pawl 46.

[0056] The movable pawl 46 is provided with a rotation hole 64 that matches with the second rod body 57, and the movable pawl 46 is installed on the second rod body 57 through the rotation hole 64. The movable pawl 46 is provided with a tooth end 65.

[0057] A pushing block 58 is provided on the inner wall of the rotating hole 64, and a first limiting body 66 and a second limiting body 60 are provided on the second rod body 57. One side of the first limiting body 66 and the second limiting body 60 forms an installation groove 44, and the other side forms a rotating area 67, and the pushing block 58 is located in the rotating area 67.

[0058] An elastic member 68 is provided on the second rod body 57, and the elastic member 68 consists of a first elastic arm 69, a second elastic arm 59 and an arc arm 70 for connecting the first elastic arm 69 and the second elastic arm 59. The first elastic arm 69 is arranged in the mounting groove 44, and the second elastic arm 59 is arranged in the rotating area 67 and maintains contact with the pushing block 58.

[0059] The first limiting body 66 is provided with an arc-shaped opening 71, and the arc-shaped arm 70 is installed in the arc-shaped opening 71. An arc-shaped area 72 is provided in the middle of the arc-shaped arm 70 to facilitate the rotation of the second elastic arm 59.

[0060] like Figure 8 As shown, the battery 3 is just in the installed state at this time, and the movable pawl 46 is kept in contact with the sliding member 48. When the battery 3 is pushed continuously, the extension portion 56 of the sliding member 48 is kept blocking the movable pawl 46, so that the battery 3 can be pushed, and the movable pawl 46 is kept rotating around the second rod 57, so that the pushing block 58 pushes the second elastic arm 59 to approach the second limiting body 60, so that it can pass over the sliding member 48. After passing over the sliding member 48, it is reset under the elastic force of the second elastic arm 59, so that the tooth end 65 of the movable pawl 46 enters the tooth groove 73 between the positioning teeth 49 and the positioning teeth 49 for limiting.

[0061] A first scale line (not shown in the figure) and a second scale line (not shown in the figure) are set on the inner wall of the installation area 15, and the distance between the first scale line and the cover plate 11 is smaller than the distance between the second scale line and the cover plate 11. The first scale line is used to push the first position of the battery 3, keep the second conductive member 24 in the fourth sliding hole 42, and achieve electrical connection. Then, the battery 3 is retracted under the elastic force of the first spring 37, so that the outer wall of the battery 3 contacts the cover plate 11 and is just flush. At this time, the first spring 37 pushes the battery 3 to move in the direction of the cover plate 11, but just makes the movable pawl 46 limit the position of the battery 3, and the movable pawl 46 cannot rotate, so that the battery 3 cannot be ejected.

[0062] If the battery 3 needs to be removed, the battery 3 can be pushed again. At this time, the battery 3 needs to be pushed to the position of the second scale line, so that the second spring 39 is compressed, thereby allowing the battery 3 to drive the movable pawl 46 to move forward, so that the movable pawl 46 passes the position of the positioning tooth 49, and the second elastic arm 59 is kept pushing the pushing block 58 close to the first limiting body 66, so that the battery 3 can be ejected under the elastic force of the second spring 39 and the first spring 37, and the movable pawl 46 passes the sliding member 48.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric power-assisted unicycle, characterized in that: include: A vehicle frame, wherein a power supply box is provided on the vehicle frame, wherein the power supply box is composed of a box body, a cover body and a cover plate, wherein the cover body is arranged on the box body, wherein the cover plate is hinged to one end of the box body by a hinge, wherein an installation area is formed inside the box body, wherein a partition is arranged within the installation area, wherein the partition separates the installation area into a first area and a second area, wherein an electrical connection assembly is provided on the partition, wherein the electrical connection assembly is composed of a first electrical connection terminal, a second electrical connection terminal and a connector for connecting the first electrical connection terminal and the second electrical connection terminal, wherein the connector is arranged on the partition, wherein a first conductive member and a second conductive member are provided inside the connector, A controller is provided in the first area, and the first electrical connection terminal is mounted on the controller. and a storage battery arranged in the second area, the second electrical connection terminal being mounted on the storage battery, the battery being pushed into the first area, the second electrical connection terminal being kept electrically connected to the first electrical connection terminal through the first conductive member and the second conductive member in the connector, Installation grooves are provided on both sides of the battery, and positioning components are provided in the installation grooves. The positioning components are composed of a movable pawl, a positioning member and a sliding member. The sliding member is installed on the positioning member, and the positioning member is arranged on the inner wall of the installation area. The positioning member is provided with multiple positioning teeth to push the battery and keep the battery driving the movable pawl to pass the sliding member and limit it at the positioning teeth on the positioning member.

2. The electric power-assisted unicycle according to claim 1, characterized in that: The connector is provided with a mounting portion, and the connector is mounted on the partition through the mounting portion. A movable hole is formed in the middle of the connector. A fixing piece is provided on one end of the connector facing the first electrical connection terminal, and a through hole is formed in the middle of the fixing piece. The first conductive piece and the second conductive piece are installed in the movable hole.

3. The electric power-assisted unicycle according to claim 2, characterized in that: The fixing member is provided with a plurality of through holes, in which balls are arranged, a first sliding hole and an accommodating hole for accommodating the balls are arranged in the middle of the first electrical connection terminal, a first blocking portion is provided on the first conductive member, a first spring is sleeved on the first conductive member, one end of the first spring is in contact with the first blocking portion, and the other end is in contact with the fixing member.

4. The electric power-assisted unicycle according to claim 3, characterized in that: A second blocking portion is provided on the second conductive member, a second spring is sleeved on the second conductive member, one end of the second spring contacts the first blocking portion, and the other end contacts the second blocking portion, a second sliding hole is provided in the middle of the first conductive member, one end of the second conductive member is placed in the second sliding hole, a third sliding hole is provided on the connecting member, a fourth sliding hole is provided in the middle of the second electrical connection terminal, and the other end of the second conductive member passes through the third sliding hole and is placed in the fourth sliding hole of the second electrical connection terminal.

5. The electric power-assisted unicycle according to claim 4, characterized in that: The elastic force of the first spring is smaller than the elastic force of the second spring.

6. The electric power-assisted unicycle according to claim 1, characterized in that: The sliding member is provided with symmetrically arranged protruding blocks, the protruding blocks are provided with a sliding portion, the positioning member is provided with a sliding groove matched with the sliding portion, and a sliding area is formed between the protruding blocks.

7. The electric power-assisted unicycle according to claim 6, characterized in that: The sliding member is provided with a fixing hole, in which a third spring is provided, one end of the third spring is placed in the fixing hole, and the other end contacts the inner wall of the installation area, and the sliding member is provided with an extension portion, which is used to block the movable pawl and keep the movable pawl rotating.

8. The electric power-assisted unicycle according to claim 1, characterized in that: The two sides of the battery are also provided with strip grooves connected with the mounting grooves, and the strip grooves keep the positioning piece from sliding into the mounting grooves.

9. The electric power-assisted unicycle according to claim 1, characterized in that: A first rod body and a second rod body are provided in the mounting groove, the second rod body is located at the upper end of the first rod body, a fourth spring is sleeved on the first rod body, a rotating hole matching the second rod body is provided on the movable pawl, the movable pawl is installed on the second rod body through the rotating hole, and the fourth spring lifts the movable pawl to keep it outside the second rod body.

10. The electric power-assisted unicycle according to claim 9, characterized in that: A pushing block is provided on the inner wall of the rotating hole, and a first limiting body and a second limiting body are provided on the second rod body. One side of the first limiting body and the second limiting body forms a mounting groove, and the other side forms a rotation area. The pushing block is in the rotation area. An elastic member is provided on the second rod body, and the elastic member consists of a first elastic arm, a second elastic arm and an arc arm for connecting the first elastic arm and the second elastic arm. The first elastic arm is arranged in the mounting groove, and the second elastic arm is arranged in the rotation area and keeps in contact with the pushing block.

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