Solar light following device

Abstract

The invention discloses a solar light following device, which belongs to the technical field of solar devices, and comprises a bracket assembly, a light tracking assembly, a light tracking assembly, a light tracking assembly and a light tracking assembly, the photovoltaic module comprises a solar panel group in transmission connection with the power transmission part, and the power transmission part is used for driving the solar panel group to follow light; the locking assembly comprises a transmission part rotationally mounted on the supporting part, a locking part elastically mounted on the supporting part, and a switch part rotationally mounted on the power transmission part; the transmission part is in transmission connection with the solar panel set, the switch part is in transmission connection with the locking part, and the switch part can rotate by a fixed radian relative to the power transmission part. Through the arrangement of the locking assembly, when the solar panel group does not carry out light following rotation, the locking assembly limits rotation of the solar panel group, and when the solar panel group carries out light following, the solar panel group can be automatically locked, so that the solar panel group is prevented from rotating due to wind interference.

Description

Technical Field

[0001] The present invention relates to the technical field of solar energy devices, in particular to a solar light chasing device. Background Art

[0002] Photovoltaic power generation is a key link in the field of renewable energy. It converts solar energy into electrical energy in a unique way. In this system, in order to maximize the energy output of photovoltaic cell modules, the application of photovoltaic tracking brackets is becoming increasingly popular. This bracket can intelligently follow the movement of the sun and automatically adjust the tilt angle and orientation of the photovoltaic module to ensure that the sun's brilliance can be captured in the best state at any time, thereby maximizing energy utilization.

[0003] Existing photovoltaic tracking brackets usually install a single or multiple solar panels. When multiple solar panels are installed, they are usually arranged in n rows and m columns in the horizontal and vertical directions. The advantage of this arrangement is that the number of solar panels installed on a single photovoltaic tracking bracket is maximized, but the disadvantage is that it occupies a large area and is suitable for open ground. In certain scenarios, such as the edge of the site, the arrangement needs to be adjusted. Multiple solar panels can only be arranged in 1 row and m columns. This arrangement will cause the length of the entire solar panel group to be longer, which is more susceptible to wind and causes shaking during light energy conversion. Summary of the invention

[0004] In view of the above problems existing in the existing solar tracking devices, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is how to solve the problem that the solar panel group is easily disturbed by wind.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a solar light-chasing device, comprising: a bracket assembly, including a mounting member, a support member arranged on the mounting member, and a power transmission member rotatably mounted on the mounting member; a photovoltaic assembly, including a solar panel group transmission-connected to the power transmission member, and the power transmission member is used to drive the solar panel group to chase light; a locking assembly, including a transmission member rotatably mounted on the support member, a locking member elastically mounted on the support member, and a switch member rotatably mounted on the power transmission member; the transmission member is transmission-connected to the solar panel group, the switch member is transmission-connected to the locking member, the switch member can rotate a fixed arc relative to the power transmission member, and the locking member is used to lock the transmission member.

[0007] As a preferred solution of the solar chasing device described in the present invention, wherein: the mounting member includes a base, and a mounting column arranged on the base, and the top of the mounting column is recessed downward to form a cavity; the support member is inserted into the cavity, and the support member is detachably connected to the mounting column.

[0008] As a preferred solution of the solar chasing device described in the present invention, wherein: the solar panel group includes a photovoltaic panel and a connecting rod, the photovoltaic panels are provided in plurality, the connecting rod is used to connect the plurality of photovoltaic panels, and the plurality of photovoltaic panels are arranged in rows and columns; a mounting groove is provided on the top of the support member, and the connecting rod is rotatably installed on the support member; the transmission member includes a first gear, the first gear is rotatably installed in the mounting groove, and a first gear tooth portion is provided at the bottom of the photovoltaic panel, and the first gear is meshed with the first gear tooth portion.

[0009] As a preferred solution of the solar chasing device described in the present invention, the power transmission component includes a driving shaft and a driven shaft, the driving shaft and the driven shaft are both rotatably mounted on the mounting column, and the driving shaft and the driven shaft are arranged parallel to each other.

[0010] As a preferred solution of the solar chasing device described in the present invention, wherein: the solar panel group also includes an arc frame, the arc frame is arranged at the bottom of the photovoltaic panel, the inner arc surface of the arc frame is provided with a second gear portion, the driving shaft is provided with a second gear, and the second gear is meshed with the second gear portion; the outer arc surface of the arc frame is provided with a roller groove, the driven shaft is provided with a roller, and the roller is in conflict with the roller groove.

[0011] As a preferred solution of the solar chasing device described in the present invention, wherein: the switch component includes a first rotating ring, the first rotating ring is coaxially arranged with the driving shaft, a first arc groove is opened on the circumferential surface of the driving shaft, a spring is arranged in the first arc groove, and a paddle is arranged on the inner circumferential surface of the first rotating ring, and the paddle is in conflict with the spring.

[0012] As a preferred solution of the solar tracking device described in the present invention, wherein: a first ratchet groove and a second ratchet groove are respectively opened on the two end faces of the first gear, the locking member includes a first ratchet ring and a second ratchet ring elastically installed in the installation groove, the first ratchet ring can be engaged with the first ratchet groove, the second ratchet ring can be engaged with the second ratchet groove, and the direction in which the first ratchet ring limits the rotation of the first gear is opposite to the direction in which the second ratchet ring limits the rotation of the first gear.

[0013] As a preferred solution of the solar chasing device described in the present invention, wherein: an installation cavity is provided at the bottom of the support member, a sleeve is elastically installed in the installation cavity, a gap avoidance groove is opened on the circumferential wall of the sleeve, and the driving shaft and the driven shaft are suitable for passing through the gap avoidance groove.

[0014] As a preferred solution of the solar chasing device described in the present invention, the sleeve is connected to the first ratchet ring and the second ratchet ring through a pull rope, and the sleeve is used to drive the first ratchet ring and the first ratchet groove, and the second ratchet ring and the second ratchet groove to separate respectively.

[0015] As a preferred solution of the solar chasing device described in the present invention, wherein: the switch component also includes a second rotating ring, the second rotating ring is sleeved on the active shaft, a second arc-shaped groove is opened on the inner circumferential wall of the second rotating ring, a protrusion is provided on the outer circumferential wall of the first rotating ring, and the protrusion is slidably matched with the second arc-shaped groove; a wedge-shaped pressure block is provided on the inner circumferential wall of the sleeve, and the second rotating ring can interfere with the wedge-shaped pressure block.

[0016] The beneficial effect of the present invention is as follows: by setting a locking component, when the solar panel group is not rotating for chasing light, the locking component limits the rotation of the solar panel group to prevent the solar panel group from rotating due to wind interference; when the solar panel group is chasing light, the lock will be automatically released. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without any creative work.

[0018] Figure 1 This is a structural diagram of a solar tracking device.

[0019] Figure 2 This is an upward structural diagram of the solar tracking device.

[0020] Figure 3 This is a structural diagram of the solar tracking device after removing the solar panel group.

[0021] Figure 4 It is a plan cross-sectional view of a solar tracking device.

[0022] Figure 5 It is a three-dimensional cross-sectional view of a solar tracking device.

[0023] Figure 6 for Figure 5 Magnified view of area A.

[0024] Figure 7 for Figure 5 Magnified view of area B.

[0025] Figure 8 This is a structural diagram of the sleeve, the first gear and the locking member of the solar light chasing device.

[0026] Fig. 9 This is a diagram of the transmission parts of the solar tracking device.

[0027] Fig.10 This is a front view of the first rotating ring of the solar tracking device.

[0028] In the figure: 100, bracket assembly; 101, mounting member; 101a, base; 101b, mounting column; 101b-1, cavity; 102, support member; 102a, mounting groove; 102d, mounting cavity; 102e, sleeve; 102e-1, air avoidance groove; 102e-2, wedge-shaped pressure block; 103, power transmission member; 103a, driving shaft; 103a-1, second gear; 103a-2, first arc groove; 103a-3, spring; 103b, driven shaft; 103b-1, roller; 200, photovoltaic module; 201, solar panel group; 201a , photovoltaic panel; 201a-1, first gear portion; 201b, connecting rod; 201c, arc frame; 201c-1, second gear portion; 201c-2, roller groove; 300, locking assembly; 301, transmission member; 301a, first gear; 301a-1, first ratchet groove; 301a-2, second ratchet groove; 302, locking member; 302a, first ratchet ring; 302b, second ratchet ring; 303, switch member; 303a, first rotating ring; 303a-1, paddle; 303a-2, protrusion; 303b, second rotating ring; 303b-1, second arc groove. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1, reference Figures 1 to 10 , which is the first embodiment of the present invention, and provides a solar light-chasing device. The solar light-chasing device includes a bracket assembly 100, a photovoltaic assembly 200, and a locking assembly 300, wherein the bracket assembly 100 is used to install the photovoltaic assembly 200 and the locking assembly 300, the photovoltaic assembly 200 is used to convert light energy into electrical energy, and the locking assembly 300 is used to lock the photovoltaic assembly 200 to prevent the photovoltaic assembly 200 from rotating due to wind interference.

[0033] Specifically, the bracket assembly 100 includes a mounting member 101, a support member 102 and a power transmission member 103; wherein the support member 102 is arranged on the mounting member 101, and the power transmission member 103 is rotatably mounted on the mounting member 101; when in use, the mounting member 101 is set on the ground.

[0034] Preferably, the photovoltaic assembly 200 includes a solar panel group 201; wherein the solar panel group 201 is transmission-connected to a power transmission member 103, and the power transmission member 103 can drive the solar panel group 201 to rotate and chase light; the solar panel group 201 is used to convert light energy into electrical energy.

[0035] Preferably, the locking assembly 300 includes a transmission member 301, a locking member 302 and a switch member 303; wherein the transmission member 301 is rotatably mounted on the support member 102, the locking member 302 is elastically mounted on the support member 102, and the switch member 303 is rotatably mounted on the power transmission member 103; the transmission member 301 is transmission-connected to the solar panel group 201, the switch member 303 is transmission-connected to the locking member 302, the switch member 303 can rotate a fixed arc relative to the power transmission member 103, and the locking member 302 is used to lock the transmission member 301.

[0036] When the solar panel group 201 of the present invention is stationary, the locking member 302 locks with the transmission member 301 so that the solar panel group 201 cannot rotate, that is, the solar panel group 201 remains stationary to prevent the solar panel group 201 from rotating due to the influence of wind. When the solar panel group 201 needs to be adjusted for chasing light, the power transmission member 103 is restricted to remain in a fixed state first, and the switch member 303 first rotates a fixed arc relative to the power transmission member 103. During this process, the locking member 302 and the transmission member 301 are disengaged from the locked state, and then the power transmission member 103 drives the solar panel group 201 to rotate and chase light.

[0037] Example 2, reference Figures 1 to 10 , which is the second embodiment of the present invention, and this embodiment is based on embodiment 1.

[0038] Specifically, the mounting member 101 includes a base 101a and a mounting column 101b; wherein, the base 101a is set on the ground, and the mounting column 101b is set on the base 101a. The mounting column 101b of this embodiment is integrally formed with the base 101a; the top of the mounting column 101b is recessed downward to form a cavity 101b-1, and the support member 102 is inserted into the cavity 101b-1, and the support member 102 and the mounting column 101b are connected by bolts.

[0039] Preferably, the solar panel group 201 includes a photovoltaic panel 201a and a connecting rod 201b. There are multiple photovoltaic panels 201a. In this embodiment, there are four photovoltaic panels 201a. The connecting rod 201b is used to connect the four photovoltaic panels 201a. The four photovoltaic panels 201a are arranged in 1 row and 4 columns. The top of the support member 102 is provided with a mounting groove 102a. The connecting rod 201b is rotatably mounted on the support member 102 and the connecting rod 201b passes through the mounting groove 102a. The transmission member 301 includes a first gear 301a. The first gear 301a is also rotatably installed in the installation groove 102a, and a first gear tooth portion 201a-1 is provided at the bottom of the photovoltaic panel 201a. The first gear 301a is meshed with the first gear tooth portion 201a-1. When the first gear 301a does not rotate, the first gear tooth portion 201a-1 does not rotate either, and the solar panel group 201 is stationary; when the solar panel group 201 is chasing light, the first gear 301a is meshed with the first gear tooth portion 201a-1 to assist the rotation of the solar panel group 201.

[0040] Preferably, the power transmission member 103 includes a driving shaft 103a and a driven shaft 103b, and the driving shaft 103a and the driven shaft 103b are both horizontally and rotatably mounted on the mounting column 101b, and the driving shaft 103a and the driven shaft 103b are arranged parallel to each other.

[0041] Preferably, the solar panel group 201 further includes an arc frame 201c, which is semicircular in shape and is arranged at the bottom of the photovoltaic panel 201a. In this embodiment, two arc frames 201c are provided, and the two arc frames 201c are arranged parallel to each other. The center of the arc frame 201c is located on the central axis of the connecting rod 201b; a second gear portion 201c-1 is provided on the inner arc surface of the arc frame 201c, and a second gear 103a-1 is provided on the driving shaft 103a. The second gear 103a-1 and the driving shaft 103a are connected to each other. The second gear tooth portion 201c-1 is meshed with each other. When the driving shaft 103a rotates, the arc frame 201c also rotates, thereby driving the solar panel group 201 to rotate around the central axis of the connecting rod 201b; a roller groove 201c-2 is provided on the outer arc surface of the arc frame 201c, and a roller 103b-1 is provided on the driven shaft 103b. The roller 103b-1 conflicts with the roller groove 201c-2. When the arc frame 201c rotates, the roller 103b-1 assists the arc frame 201c to rotate, making its rotation more stable.

[0042] Preferably, the switch member 303 includes a first rotating ring 303a, which is sleeved on the driving shaft 103a, and the first rotating ring 303a is coaxially arranged with the driving shaft 103a, and a motor (not shown in the figure) is arranged in the cavity 101b-1, and the motor and the first rotating ring 303a are connected by a belt; a first arc groove 103a-2 is opened on the circumferential surface of the driving shaft 103a, and the center of the first arc groove 103a-2 is located on the central axis of the driving shaft 103a, a spring 103a-3 is arranged in the first arc groove 103a-2, and a paddle 303a-1 is arranged on the inner circumferential surface of the first rotating ring 303a, and the paddle 303a-1 conflicts with the spring 103a-3; the first rotating ring 303a can first rotate a fixed angle relative to the driving shaft 103a, and then the first rotating ring 303a drives the driving shaft 103a to rotate synchronously.

[0043] Preferably, a first ratchet groove 301a-1 and a second ratchet groove 301a-2 are respectively provided on the two end surfaces of the first gear 301a, and the locking member 302 includes a first ratchet ring 302a and a second ratchet ring 302b elastically installed in the installation groove 102a. In the initial state, that is, when the solar light chasing device does not need to chase light, the first ratchet ring 302a can be engaged with the first ratchet groove 301a-1, and the second ratchet ring 302b can be engaged with the second ratchet groove 301a-2. The direction in which the first ratchet ring 302a limits the rotation of the first gear 301a is opposite to the direction in which the second ratchet ring 302b limits the rotation of the first gear 301a, thereby limiting the rotation of the first gear 301a, and further limiting the rotation of the solar panel group 201, thereby preventing the solar panel group 201 from rotating due to wind interference.

[0044] Preferably, an installation cavity 102d is provided at the bottom of the support member 102, and a sleeve 102e is elastically installed in the installation cavity 102d. The sleeve 102e is coaxially arranged with the support member 102, and an air avoidance groove 102e-1 is opened on the circumferential wall of the sleeve 102e. The active shaft 103a and the driven shaft 103b can pass through the air avoidance groove 102e-1 to avoid interference between the sleeve 102e and the active shaft 103a and the driven shaft 103b when the sleeve 102e moves up and down.

[0045] Preferably, the sleeve 102e is connected to the first ratchet ring 302a and the second ratchet ring 302b by a pull rope. When the sleeve 102e moves downward, the sleeve 102e can pull the first ratchet ring 302a and the first ratchet groove 301a-1, and the second ratchet ring 302b and the second ratchet groove 301a-2 apart through the pull rope; so that the first gear 301a is released from the restriction on circumferential rotation, so that the solar panel group 201 can rotate to chase light.

[0046] Furthermore, the switch member 303 further includes a second rotating ring 303b, which is sleeved on the driving shaft 103a, and the second rotating ring 303b is coaxially arranged with the driving shaft 103a. A second arc groove 303b-1 is provided on the inner peripheral wall of the second rotating ring 303b, and a convex block 303a-2 is provided on the outer peripheral wall of the first rotating ring 303a. The convex block 303a-2 is slidably matched with the second arc groove 303b-1. When the first rotating ring 303a rotates relative to the driving shaft 103a, the convex block 303a-2 and the second arc groove 303b-1 are slidably matched. With the cooperation of the groove 303b-1, the second rotating ring 303b moves axially relative to the active shaft 103a; a wedge-shaped pressure block 102e-2 is provided on the inner wall of the sleeve 102e, and the second rotating ring 303b can interfere with the wedge-shaped pressure block 102e-2. When the second rotating ring 303b moves axially relative to the active shaft 103a, the sleeve 102e gradually descends, and the sleeve 102e pulls the first ratchet ring 302a and the first ratchet groove 301a-1, and the second ratchet ring 302b and the second ratchet groove 301a-2 are separated respectively through the pull rope.

[0047] In order to facilitate understanding of the technical solution of the present invention, a brief description of its working process is given below:

[0048] Only when the motor is working, it first drives the first rotating ring 303a to rotate a fixed angle relative to the driving shaft 103a. During this process, under the cooperation of the protrusion 303a-2 and the second arc groove 303b-1, the second rotating ring 303b moves axially relative to the driving shaft 103a, and the sleeve 102e gradually descends. The sleeve 102e pulls the first ratchet ring 302a and the first ratchet groove 301a-1, and the second ratchet ring 302b and the second ratchet groove 301a-2 respectively through the pull rope, and the first gear 301a releases the restriction on circumferential rotation, and then continues to drive the first rotating ring 303a to drive the driving shaft 103a to rotate synchronously, so that the solar panel group 201 can rotate to chase light;

[0049] After the light tracking adjustment is completed, the first ratchet ring 302a and the first ratchet groove 301a-1, and the second ratchet ring 302b and the second ratchet groove 301a-2 are re-engaged, thereby restricting the rotation of the first gear 301a and the solar panel group 201 again, preventing the solar panel group 201 from rotating due to wind interference.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A solar light chasing device, characterized in that: include, A support assembly (100) comprises a mounting member (101), a support member (102) arranged on the mounting member (101), and a power transmission member (103) rotatably mounted on the mounting member (101); A photovoltaic assembly (200), comprising a solar panel group (201) transmission-connected to the power transmission member (103), wherein the power transmission member (103) is used to drive the solar panel group (201) to chase light; A locking assembly (300) comprising a transmission member (301) rotatably mounted on the support member (102), a locking member (302) elastically mounted on the support member (102), and a switch member (303) rotatably mounted on the power transmission member (103); The transmission member (301) is transmission-connected to the solar panel group (201), the switch member (303) is transmission-connected to the locking member (302), the switch member (303) is capable of rotating at a fixed arc relative to the power transmission member (103), and the locking member (302) is used to lock the transmission member (301).

2. The solar light chasing device according to claim 1, characterized in that: The mounting member (101) comprises a base (101a) and a mounting column (101b) arranged on the base (101a), wherein the top of the mounting column (101b) is recessed downward to form a cavity (101b-1); the support member (102) is inserted into the cavity (101b-1), and the support member (102) is detachably connected to the mounting column (101b).

3. The solar light chasing device according to claim 2, characterized in that: The solar panel group (201) comprises a photovoltaic panel (201a) and a connecting rod (201b), wherein a plurality of photovoltaic panels (201a) are provided, and the connecting rod (201b) is used to connect the plurality of photovoltaic panels (201a), wherein the plurality of photovoltaic panels (201a) are arranged in 1 row and n columns; a mounting groove (102a) is provided at the top of the support member (102), and the connecting rod (201b) is rotatably mounted on the support member (102); the transmission member (301) comprises a first gear (301a), wherein the first gear (301a) is rotatably mounted in the mounting groove (102a), and a first gear tooth portion (201a-1) is provided at the bottom of the photovoltaic panel (201a), and the first gear (301a) is meshed with the first gear tooth portion (201a-1).

4. The solar light chasing device according to claim 3, characterized in that: The power transmission component (103) comprises a driving shaft (103a) and a driven shaft (103b), wherein the driving shaft (103a) and the driven shaft (103b) are both rotatably mounted on the mounting column (101b), and the driving shaft (103a) and the driven shaft (103b) are arranged parallel to each other.

5. The solar light chasing device according to claim 4, characterized in that: The solar panel group (201) further comprises an arc frame (201c), wherein the arc frame (201c) is arranged at the bottom of the photovoltaic panel (201a), a second gear portion (201c-1) is provided on the inner arc surface of the arc frame (201c), a second gear (103a-1) is provided on the driving shaft (103a), and the second gear (103a-1) is meshed with the second gear portion (201c-1); a roller groove (201c-2) is provided on the outer arc surface of the arc frame (201c), a roller (103b-1) is provided on the driven shaft (103b), and the roller (103b-1) is in conflict with the roller groove (201c-2).

6. The solar light chasing device according to claim 5, characterized in that: The switch element (303) comprises a first rotating ring (303a), the first rotating ring (303a) being coaxially arranged with the driving shaft (103a), a first arc-shaped groove (103a-2) being provided on the circumferential surface of the driving shaft (103a), a spring (103a-3) being provided in the first arc-shaped groove (103a-2), a paddle (303a-1) being provided on the inner circumferential surface of the first rotating ring (303a), and the paddle (303a-1) being in conflict with the spring (103a-3).

7. The solar light-chasing device according to claim 6, characterized in that: A first ratchet groove (301a-1) and a second ratchet groove (301a-2) are respectively provided on the two end surfaces of the first gear (301a), and the locking member (302) comprises a first ratchet ring (302a) and a second ratchet ring (302b) elastically installed in the installation groove (102a), the first ratchet ring (302a) can be engaged with the first ratchet groove (301a-1), and the second ratchet ring (302b) can be engaged with the second ratchet groove (301a-2), and the direction in which the first ratchet ring (302a) limits the rotation of the first gear (301a) is opposite to the direction in which the second ratchet ring (302b) limits the rotation of the first gear (301a).

8. The solar light chasing device according to claim 7, characterized in that: The bottom of the support member (102) is provided with an installation cavity (102d), a sleeve (102e) is elastically installed in the installation cavity (102d), a clearance groove (102e-1) is opened on the circumferential wall of the sleeve (102e), and the driving shaft (103a) and the driven shaft (103b) are suitable for passing through the clearance groove (102e-1).

9. The solar light-chasing device according to claim 8, characterized in that: The sleeve (102e) is connected to the first ratchet ring (302a) and the second ratchet ring (302b) via a pull rope, and the sleeve (102e) is used to drive the first ratchet ring (302a) and the first ratchet groove (301a-1), and the second ratchet ring (302b) and the second ratchet groove (301a-2) to separate respectively.

10. The solar light chasing device according to claim 8 or 9, characterized in that: The switch element (303) further comprises a second rotating ring (303b), the second rotating ring (303b) being sleeved on the driving shaft (103a), a second arc-shaped groove (303b-1) being provided on the inner peripheral wall of the second rotating ring (303b), a convex block (303a-2) being provided on the outer peripheral wall of the first rotating ring (303a), the convex block (303a-2) being slidably matched with the second arc-shaped groove (303b-1); a wedge-shaped pressure block (102e-2) being provided on the inner peripheral wall of the sleeve (102e), the second rotating ring (303b) being able to abut against the wedge-shaped pressure block (102e-2).

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