Remote control accessory and transmission device thereof

Abstract

The embodiment of the utility model provides a remote control accessory and a transmission device thereof. The transmission device comprises a first transmission wheel, a first tooth set is arranged on a partial area of the peripheral wall of the first transmission wheel, avoiding parts are formed on the two sides of the first tooth set respectively, and the first transmission wheel can rotate in the first direction and the second direction opposite to the first direction; the first transmission wheel can be positioned in at least one preset position; at least partial area of the peripheral wall of the second transmission wheel is provided with a second tooth group, the second transmission wheel can rotate to a first position or a second position through meshing matching of the second tooth group and the first tooth group, and when the first transmission wheel is positioned at the preset position, the second transmission wheel can rotate to a second position or a third position through meshing matching of the second tooth group and the first tooth group. The receding part is located on the rotating path of the second tooth set, and the first tooth set leaves the rotating path of the second tooth set.

Description

Technical Field

[0001] Embodiments of this disclosure relate to the field of electrical equipment, and more specifically to a remote control accessory and its transmission mechanism. Background Technology

[0002] Remote control attachments (RCAs) can be used with switching devices (such as circuit breakers) to enable remote control of the switching devices.

[0003] A typical RCA (Regulatory Control Unit) includes a motor, a gear transmission mechanism, and an operating handle. The gear transmission mechanism includes a first gear and a second gear arranged coaxially, and a third gear meshing with the second gear. The first gear is coupled to the motor to rotate under its drive. A protrusion is provided on the side of the first gear facing the second gear, and an arc-shaped groove is provided on the side of the second gear facing the first gear. The protrusion of the first gear extends into and slides into the groove. The third gear meshes with the second gear and is coaxially coupled to the RCA's operating handle. When either the third gear or the operating handle is subjected to a driving force, it will cause the other to rotate. The operating handle is used to couple with the switch handle of a switching device, so that the RCA and the switching device are synchronously in the open or closed state.

[0004] Upon receiving a remote control signal (more specifically, a trip / close signal), the RCA motor drives the first gear to rotate in one direction. The protrusion of the first gear slides within the groove of the second gear until it abuts against the end wall of the groove. As the first gear continues to rotate, the second gear also rotates. Through the meshing of the second and third gears, the third gear also rotates, causing the RCA's operating handle to rotate the circuit breaker's operating handle to switch to the trip or close position. Subsequently, the motor drives the first gear to rotate in the opposite direction, causing the protrusion of the first gear to move in the opposite direction within the groove of the second gear, disengaging from the aforementioned end wall of the groove. This method does not affect the trip or close status of the RCA and circuit breaker, and also avoids the need for manual control of the RCA's operating handle and the switch's operating handle, allowing for manual changes to the trip or close status of the RCA and the switch. However, because the motor needs to drive the first gear to rotate continuously in two opposite directions each time the RCA receives a trip / close signal, this results in significant motor wear. Utility Model Content

[0005] The purpose of this disclosure is to provide a remote control accessory and its transmission mechanism to at least partially solve the above-mentioned problems.

[0006] In a first aspect of this disclosure, a transmission device for a remote control accessory is provided, comprising: a first transmission wheel for coupling with a motor of the remote control accessory, wherein a portion of the outer peripheral wall of the first transmission wheel is provided with at least one first set of teeth, and each first set of teeth has a clearance portion formed on both sides; the first transmission wheel is rotatable in a first direction and a second direction opposite to the first direction under the drive of the motor, and the first transmission wheel is rotatable at at least one predetermined position; and a second transmission wheel for coupling with an operating handle of the remote control accessory, wherein at least a portion of the outer peripheral wall of the second transmission wheel is provided with a second set of teeth, and when the first transmission wheel rotates in the first direction or the second direction, the second transmission wheel is rotatable to a first position or a second position by meshing the second set of teeth with the first set of teeth; and when the first transmission wheel is rotatable at the predetermined position, the clearance portion is located on the rotation path of the second set of teeth and the first set of teeth leaves the rotation path of the second set of teeth, so as to allow the second transmission wheel to rotate between the first position and the second position under the drive of the operating handle.

[0007] In some embodiments, at least two first tooth sets are provided on the outer peripheral wall of the first transmission wheel, and the at least two first tooth sets are evenly spaced apart in the circumferential direction of the first transmission wheel.

[0008] In some embodiments, two sets of the first gear are symmetrically arranged on the outer peripheral wall of the first drive wheel.

[0009] In some embodiments, the transmission device further includes a transmission mechanism coupled between the motor and the first transmission wheel for transmitting the torque output by the motor to the first transmission wheel.

[0010] In some embodiments, the transmission mechanism includes a transmission gear that is coaxially coupled to the first transmission wheel and is used to drive the first transmission wheel to rotate.

[0011] In some embodiments, one of the two opposing sides of the first drive wheel and the drive gear is provided with a protrusion and the other is provided with a recess, the protrusion engaging with the recess.

[0012] In a second aspect of this disclosure, a remote control accessory is provided, comprising: a housing; a motor disposed on the housing; an operating handle disposed on the housing and rotatable between an open position and an closed position; and a transmission device according to a first aspect of this disclosure disposed on the housing.

[0013] In some embodiments, the remote control accessory further includes: a controller electrically connected to the motor; and at least one position sensor electrically connected to the controller, wherein the position sensor is used to detect the position of the first drive wheel and send a control signal to the controller when the first drive wheel rotates to the predetermined position, and the controller controls the motor to stop rotating according to the control signal.

[0014] In some embodiments, the operating handle is coaxially coupled to the second drive wheel, and the operating handle is used to couple with the switch handle of the switching device.

[0015] In some embodiments, a fixing sleeve is provided on the operating handle, and the fixing sleeve is used to couple with the switch handle.

[0016] In some embodiments, the operating handle includes a first link and two parallel second links extending from the first link, and the fixing sleeve is disposed on the first link, and the second drive wheel is located between the two second links and coaxially coupled to the two second links.

[0017] In embodiments according to this disclosure, after the motor rotates in one direction to drive the operating handle to switch between the open and closed positions, the motor can continue to rotate in the original direction to a predetermined position, so that the first transmission wheel rotates to a position where its clearance portion is located on the rotation path of the second gear set of the second transmission wheel, and the first gear set of the first transmission wheel leaves the rotation path of the second gear set. Thus, when the position of the operating handle is manually switched, the second transmission wheel can rotate with the operating handle without being interfered with by the first gear set. That is, after the operating handle changes position once via the motor, it is not necessary for the motor to rotate in two consecutive opposite directions, allowing for manual switching of the operating handle position. This significantly reduces motor wear and simplifies the motor operation procedure.

[0018] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0019] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0020] Figure 1 A schematic diagram of a portion of the structure of a remote control accessory according to an embodiment of the present disclosure is shown;

[0021] Figure 2 Schematic illustration Figure 1 A simplified structural diagram of the first transmission wheel, the second transmission wheel, and the transmission gear in the transmission device of the remote control accessory shown;

[0022] Figure 3 It shows Figure 1 A three-dimensional view of the first transmission wheel in the diagram; and

[0023] Figures 4 to 7 It shows Figure 1 The process shown illustrates the switching between the closed and open states of the remote control accessory. Detailed Implementation

[0024] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0025] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0026] As described above, in conventional remote control accessories (RCAs), due to the structural limitations of the gear transmission mechanism that transmits power between the motor and the operating handle, the motor needs to rotate in two consecutive opposite directions every time the operating handle is moved, allowing manual switching of the operating handle's position. This results in significant motor wear. Embodiments of this disclosure provide a remote control accessory and its transmission device. Using this transmission device, the operating handle of the remote control accessory can be manually switched without the motor needing to rotate in two consecutive opposite directions after being moved once, thereby significantly reducing motor wear and simplifying the motor operation procedure. In the following sections, [further details will be provided]. Figures 1 to 7 The principles of this disclosure are described.

[0027] Figure 1 A schematic diagram of a portion of the structure of a remote control accessory 100 according to an embodiment of the present disclosure is shown. Figure 2 Schematic illustration Figure 1A simplified structural diagram of the first transmission wheel 11, the second transmission wheel 12, the transmission gear 13, and the transmission gear 14 in the transmission device of the remote control accessory 100 shown. Figure 3 It shows Figure 1 A perspective view of the first transmission wheel 11 in the middle.

[0028] Figures 6 to 7 It shows Figure 1 The switching process of the remote control accessory's operating handle 30 is shown.

[0029] See Figure 1 and Figure 2 The remote control accessory 100 may include a housing 50, a motor 20, an operating handle 30, a controller, and a transmission device according to embodiments of the present disclosure. The motor 20, transmission device, and controller may be mounted on the housing 50, and more specifically, may be fixedly mounted inside the housing 50. The operating handle 30 is mounted on the housing 50 and can rotate between an open position and a closed position. The transmission device may include a first transmission wheel 11, a second transmission wheel 12, and a transmission mechanism 10. The first transmission wheel 11 is indirectly coupled to the motor 20, for example, through the transmission mechanism 10. The second transmission wheel 12 may be directly or indirectly coupled to the operating handle 30. The controller is electrically connected to the motor 20 and is used to control the starting and stopping of the motor 20.

[0030] The remote control accessory 100 can be used with a switching device (not shown in the figure) to remotely control the opening and closing operations of the switching device. The switching device can be, for example, but is not limited to, a circuit breaker.

[0031] Specifically, when the controller of the remote control accessory 100 receives a remote control signal (more specifically, a tripping or closing signal issued by the system), the control motor 20 is energized and rotates. The torque output by the motor 20 is transmitted to the first transmission wheel 11 via the transmission mechanism 10, causing the first transmission wheel 11 to rotate. The rotation of the first transmission wheel 11 drives the second transmission wheel 12 to rotate, which in turn drives the operating handle 30 coupled to the second transmission wheel 12 to rotate, thus switching the operating handle 30 to the tripping or closing position. The rotation of the operating handle 30 drives the switch handle of the switching device (not shown in the figure) coupled to the operating handle 30 to rotate, thus switching the switch handle to the tripping or closing position.

[0032] It is understood that when the operating handle 30 is in the closed position, the remote control accessory 100 is in the closed state, and correspondingly, when the switch handle is in the closed position, the switching device is in the closed state. When the operating handle 30 is in the open position, the remote control accessory 100 is in the open state, and correspondingly, when the switch handle is in the open position, the switching device is in the open state.

[0033] The following is combined Figure 1 and Figure 2 To illustrate the connection relationship between components such as the transmission mechanism 10 and the motor 20, for ease of understanding, Figure 1 Only a portion of the structure of the housing 50 is shown. In some embodiments, the transmission mechanism 10 may include a worm gear mechanism, a transmission gear 13, and a transmission gear 14. The worm in the worm gear mechanism may be coaxially coupled to the output shaft of the motor 20, for example, and the worm wheel may be coaxially coupled to a gear (not labeled) that may directly or indirectly mesh with the first gear portion 141 of the transmission gear 14. The transmission gear 14 may also include a second gear portion 142 coaxially coupled to the first gear portion 141, which may mesh with the transmission gear 13. In some embodiments, the first gear portion 141 and the second gear portion 142 of the transmission gear 14 may be integrally formed. The transmission gear 13 is coaxially coupled to the first transmission wheel 11. When the motor 20 rotates in the forward or reverse direction, the first transmission wheel 11 may rotate in the forward or reverse direction. Figure 5 The first direction T1 shown rotates or moves along Figure 7 The second direction T2 is shown. The first direction T1 and the second direction T2 are opposite. Of course, the implementation of the transmission mechanism 10 is not limited to the above example, as long as it can transmit torque between the motor 20 and the first transmission wheel 11.

[0034] See Figure 3 At least one first tooth set 111 is provided on a portion of the outer peripheral wall of the first transmission wheel 11. When there are two or more first tooth sets 111, the two or more first tooth sets 111 are evenly spaced apart in the circumferential direction of the first transmission wheel 11. Each first tooth set 111 includes multiple teeth. Alternating clearance portions are formed on both sides of each first tooth set 111, and the two clearance portions located on both sides of the same first tooth set 111 can be clearance portion 112 and clearance portion 113. In this embodiment, two first tooth sets 111 are symmetrically arranged on the outer peripheral wall of the first transmission wheel 11.

[0035] At least a portion of the outer peripheral wall of the second transmission wheel 12 is provided with a second tooth set 121, which includes multiple teeth. When the first transmission wheel 11 is driven by the motor 20 to rotate in the first direction T1 or the second direction T2, the second transmission wheel 12 can rotate to the first position or the second position through the meshing of the second tooth set 121 with the first tooth set 111, thereby driving the operating handle 30 to switch to the open position or the closed position.

[0036] The motor 20 can stop driving the first transmission wheel 11 to continue rotating in the original direction by a predetermined angle, thus positioning the first transmission wheel 11 in a predetermined position. When the first transmission wheel 11 is positioned in the predetermined position, the avoidance part 112 or the avoidance part 113 is located on the rotation path of the second gear set 121, and the first gear set 111 is away from the rotation path of the second gear set 121. In this way, when the position of the operating handle 30 is manually switched, the second transmission wheel 12 can rotate with the operating handle 30 between the first position and the second position without being interfered with by the first gear set 111. That is, after the operating handle 30 changes position once by the motor 20, the motor 20 does not need to rotate in two opposite directions continuously, thus allowing manual switching of the position of the operating handle 30. This can significantly reduce the wear of the motor 20 and simplify the operation procedure of the motor 20.

[0037] See Figure 2 and Figure 3 In some embodiments, one of the two opposing sides of the first drive wheel 11 and the drive gear 13 is provided with a protrusion 131, and the other is provided with a recess 110. The protrusion 131 and the recess 110 cooperate to coaxially couple the first drive wheel 11 and the drive gear 13, with the first drive wheel 11 being driven by the drive gear 13. In this embodiment, the recess 110 is provided on the first drive wheel 11 and extends generally in an arc shape. The protrusion 131 is provided on the drive gear 13, and the inner circumferential contour of the recess 110 matches the outer circumferential contour of the protrusion 131. Of course, in some alternative embodiments, there are many other ways to achieve coaxial coupling between the first drive wheel 11 and the drive gear 13, and it is not limited to the examples above.

[0038] In some embodiments, the remote control accessory may further include at least one position sensor (not shown), which is electrically connected to the controller. The position sensor detects the position of the first drive wheel 11 and sends a control signal to the controller when the first drive wheel 11 rotates to a predetermined position. The controller then controls the motor 20 to stop rotating based on the control signal. The position sensor can be any type of sensor, as long as it can send a control signal to the controller when the first drive wheel 11 rotates to the predetermined position.

[0039] See Figure 1 and Figure 4The embodiments of this disclosure also provide an exemplary structure for the operating handle 30. Specifically, the operating handle 30 may include a first link 31 and two parallel second links 32 extending from the first link 31. A second transmission wheel 12 is located between the two second links 32 and coaxially coupled to the two second links 32, such that the operating handle 30 is coaxially coupled to the second transmission wheel 12 so that they can rotate together. A fixing sleeve 40 may be provided on the first link 31, and the fixing sleeve 40 may be detachably coupled to the switch handle of a switching device, for example. More specifically, the fixing sleeve 40 includes, for example, an opening slot 41 through which the switch handle of the switching device can be engaged with the fixing sleeve 40. Of course, in other embodiments, the operating handle 30 and the fixing sleeve 40 may have other implementations and are not limited to the examples described above.

[0040] The following is combined Figures 4 to 7 This will illustrate the process of switching between the closed and open states of the remote control accessory 100 provided in the embodiments of this disclosure.

[0041] See Figure 4 The second transmission wheel 12 is in the first position, at which time the operating handle 30 is in the open or closed position. For ease of explanation, it is assumed that the operating handle 30 is in the open position at this time. Correspondingly, the remote control accessory 100 is in the open state, the switching device matched with the remote control accessory 100 is in the open state, and the switch handle of the switching device is in the open position.

[0042] Figure 4 In this configuration, the first transmission wheel 11 is in a predetermined position, and the avoidance part 112 is located on the rotation path of the second gear set 121. Either of the first gear sets 111 is positioned away from the rotation path of the second gear set 121 to avoid interfering with its rotation. At this time, the user can manually move the operating handle 30 to the desired position (e.g., to switch the switching device to the closed state). Figure 4 Turn to the right so that the operating handle 30 is rotated to the closed position.

[0043] When it is necessary to remotely control the operating handle 30 from Figure 4 When the state shown moves to the closed position, the system sends a remote control signal (more specifically, a closing signal) to the controller of the remote control accessory 100. The controller controls the motor 20 to be energized and drives the first transmission wheel 11 to rotate in the first direction T1 through the transmission mechanism 10.

[0044] See Figure 5 During the rotation of the first transmission wheel 11 in the first direction T1, its first tooth set 111 meshes with the second tooth set 121 of the second transmission wheel 12, and the second transmission wheel 12 rotates from the first position to the second position. The operating handle 30 rotates towards the closed position as the second transmission wheel 12 rotates.

[0045] See Figure 6 , when the first driving wheel 11 rotates in the first direction T1 to a position where the first tooth group 111 disengages from the second tooth group 121, the second driving wheel 12 moves to the second position. Correspondingly, the remote control accessory 100 is in the closing state, the switching device paired with the remote control accessory 100 is in the closing state, and the switch handle of the switching device is in the closing position.

[0046] After the first tooth group 111 and the second tooth group 121 disengage from each other, the motor 20 drives the first driving wheel 11 to continue rotating in the first direction T1 by a predetermined angle (the magnitude of this predetermined rotation angle can be set according to actual conditions), so that the first driving wheel 11 reaches another predetermined position, such as Figure 7 As shown, at this time, the avoidance portion 113 is located on the rotation path of the second tooth group 121. After the position sensor detects that the first driving wheel 11 rotates to this another predetermined position, it sends a control signal to the controller, and the controller then controls the motor 20 to stop rotating. At this time, any one of the first tooth groups 111 leaves the rotation path of the second tooth group 121 without interfering with the rotation of the second driving wheel 12. After that, the user can manually turn the operating handle 30 Figure 7 to the left in

[0047] to rotate the operating handle 30 to the opening position. Figure 7 When it is necessary to rotate the operating handle 30 from the state shown in Figure 4 to the opening position by remote control, the controller controls the motor 20 to drive the first driving wheel 11 to rotate in the second direction T2 until the first driving wheel 11 rotates to the Figure 4 shown predetermined position. Then, the controller controls the motor 20 to stop rotating according to the control signal sent by the corresponding position sensor. At this time, the remote control accessory 100 returns to the

[0048] shown opening state. Figure 4 Of course, in some alternative embodiments, after manually rotating the operating handle 30 shown in Figure 7 to the closing position, the motor 20 can drive the first driving wheel 11 to rotate in the second direction T2 opposite to the first direction T1 to the corresponding predetermined position, so as to automatically rotate the operating handle 30 to the opening position. Similarly, after manually rotating the operating handle 30 shown in

[0049] to the opening position, the motor 20 can drive the first driving wheel 11 to rotate in the first direction T1 opposite to the second direction T2 to the corresponding predetermined position, so as to automatically rotate the operating handle 30 to the closing position.In the embodiments according to this disclosure, after the motor 20 rotates in one direction to drive the operating handle 30 to switch between the open and closed positions, the motor 20 can continue to rotate in the original direction to a predetermined position, so that the first transmission wheel 11 rotates to the position where its clearance part 112 or clearance part 113 is located on the rotation path of the second gear set 121 of the second transmission wheel 12, and the first gear set 111 of the first transmission wheel 11 leaves the rotation path of the second gear set 121. Thus, when the position of the operating handle 30 is manually switched, the second transmission wheel 12 can rotate with the operating handle 30 without being interfered with by the first gear set 111. That is, after the operating handle 30 changes position once via the motor 20, the motor 20 does not need to rotate in two consecutive opposite directions to allow manual switching of the position of the operating handle 30, thereby significantly reducing the wear of the motor 20 and simplifying the operation procedure of the motor 20. Using the remote control accessory 100 of the embodiments of this disclosure can also reduce the number of position sensors used, thereby reducing costs.

[0050] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A transmission device for a remote control accessory, characterized in that, include: A first transmission wheel (11) is used to couple with the motor (20) of the remote control accessory (100). A portion of the outer peripheral wall of the first transmission wheel (11) is provided with at least one first tooth set (111). Each first tooth set (111) has a clearance portion formed on both sides. The first transmission wheel (11) can rotate in a first direction (T1) and a second direction (T2) opposite to the first direction (T1) under the drive of the motor (20). The first transmission wheel (11) can be positioned at at least one predetermined position. as well as The second transmission wheel (12) is coupled to the operating handle (30) of the remote control accessory (100). At least a portion of the outer peripheral wall of the second transmission wheel (12) is provided with a second set of teeth (121). When the first transmission wheel (11) rotates in the first direction (T1) or the second direction (T2), the second transmission wheel (12) can rotate to the first position or the second position through the meshing of the second gear set (121) and the first gear set (111). When the first transmission wheel (11) is positioned in the predetermined position, the clearance part is located on the rotation path of the second gear set (121) and the first gear set (111) leaves the rotation path of the second gear set (121) to allow the second transmission wheel (12) to rotate between the first position and the second position under the drive of the operating handle (30).

2. The transmission device according to claim 1, characterized in that, At least two first tooth sets (111) are provided on the outer peripheral wall of the first transmission wheel (11), and the at least two first tooth sets (111) are evenly spaced in the circumferential direction of the first transmission wheel (11).

3. The transmission device according to claim 2, characterized in that, Two sets of the first gear (111) are symmetrically arranged on the outer peripheral wall of the first transmission wheel (11).

4. The transmission device according to any one of claims 1 to 3, characterized in that, It also includes a transmission mechanism (10) coupled between the motor (20) and the first transmission wheel (11) for transmitting the torque output by the motor (20) to the first transmission wheel (11).

5. The transmission device according to claim 4, characterized in that, The transmission mechanism (10) includes a transmission gear (13), which is coaxially coupled to the first transmission wheel (11) and is used to drive the first transmission wheel (11) to rotate.

6. The transmission device according to claim 5, characterized in that, One of the two opposing sides of the first transmission wheel (11) and the transmission gear (13) is provided with a protrusion (131) and the other is provided with a recess (110), and the protrusion (131) and the recess (110) cooperate with each other.

7. A remote control accessory (100), characterized in that, include: Casing (50); The motor (20) is mounted on the housing (50); The operating handle (30) is disposed on the housing (50) and can rotate between the open position and the closed position; as well as The transmission device according to any one of claims 1 to 6 is disposed on the housing (50).

8. The remote control accessory (100) according to claim 7, characterized in that, Also includes: The controller is electrically connected to the motor (20); At least one position sensor is electrically connected to the controller, wherein the position sensor is used to detect the position of the first drive wheel (11) and send a control signal to the controller when the first drive wheel (11) rotates to the predetermined position, and the controller controls the motor (20) to stop rotating according to the control signal.

9. The remote control accessory (100) according to claim 7 or 8, characterized in that, The operating handle (30) is coaxially coupled to the second transmission wheel (12), and the operating handle (30) is used to couple with the switch handle of the switching device.

10. The remote control accessory (100) according to claim 9, characterized in that, A fixing sleeve (40) is provided on the operating handle (30), and the fixing sleeve (40) is used to couple with the switch handle.

11. The remote control accessory (100) according to claim 10, characterized in that, The operating handle (30) includes a first link (31) and two parallel second links (32) extending from the first link (31). The fixed sleeve (40) is disposed on the first connecting rod (31), and the second transmission wheel (12) is located between the two second connecting rods (32) and is coaxially coupled to the two second connecting rods (32).

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