Double-connecting-rod driving structure

Abstract

The utility model discloses a double-connecting-rod driving structure which comprises a support, two connecting rods, an eccentric shaft and a driving wheel, an installation space is formed in the support, the two connecting rods and the driving wheel are installed in the installation space, the two ends of the eccentric shaft penetrate through the two opposite side walls of the support respectively, and the eccentric shaft can rotate relative to the support. The eccentric shaft is sleeved with the driving wheel structure, the two connecting rods are oppositely arranged on the two sides of the driving wheel, one end of each connecting rod is rotationally connected with the support, and the other end of each connecting rod is rotationally connected with the corresponding side of the driving wheel; when the eccentric shaft drives the driving wheel to reciprocate in the first direction, the connecting rod floats in the second direction so as to provide corresponding pulling force or pushing force for reciprocating motion of the driving wheel. The connecting rod is connected with the support in a rotating mode, the connecting rod can freely float to eliminate plane friction when the eccentric shaft moves up and down, and the problem that stroke precision is reduced after abrasion can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting rod driving structures, in particular to a double connecting rod driving structure. Background Art

[0002] Traditional reciprocating motion systems usually use a cam-connecting rod mechanism to achieve power conversion and transmission. The core components of this mechanism include a cam and a connecting rod, in which the cam converts rotary motion into linear reciprocating motion by driving the connecting rod. However, when the cam moves up and down, it will generate friction in the same direction between it and the front and rear planes of the fixed bracket. In long-term operation, this friction will cause the front and rear planes of the bracket to wear, and the plane size will gradually increase, which will affect the stroke accuracy of the linear reciprocating motion, resulting in unstable motion and inaccurate positioning. Utility Model Content

[0003] The technical problem to be solved by the utility model is that when the cam of the existing cam-link mechanism moves up and down, frictional forces in the same direction are generated between it and the front and rear planes of the fixed bracket, resulting in wear of the front and rear planes of the bracket, thereby affecting the stroke accuracy of the linear reciprocating motion.

[0004] In order to solve the above technical problems, the utility model provides a double-link driving structure, including a bracket, two connecting rods, an eccentric shaft and a driving wheel, wherein an installation space is formed in the bracket, the two connecting rods and the driving wheel are installed in the installation space, the two ends of the eccentric shaft are respectively passed through the two opposite side walls of the bracket, and the eccentric shaft can rotate relative to the bracket, the driving wheel structure is sleeved on the eccentric shaft, the two connecting rods are relatively arranged on both sides of the driving wheel, one end of the connecting rod is rotatably connected to the bracket, and the other end of the connecting rod is rotatably connected to the corresponding side of the driving wheel;

[0005] When the eccentric shaft drives the driving wheel to reciprocate along the first direction, the connecting rod floats along the second direction to provide corresponding pulling force or pushing force for the reciprocating motion of the driving wheel.

[0006] In some embodiments, the driving wheel includes an eccentric sleeve and a bearing, the bearing is sleeved on the circumferential side of the eccentric shaft, the eccentric sleeve is sleeved on the circumferential side of the bearing, and the other end of the connecting rod is rotatably connected to the corresponding side of the eccentric sleeve.

[0007] In some embodiments, the eccentric sleeve includes a main body and two first connecting parts, the two first connecting parts are integrally formed with the main body, and the two first connecting parts are centrally symmetrically distributed about the center of the main body, the other end of the connecting rod is rotatably connected to the corresponding first connecting part, and the main body is sleeved on the circumferential side of the bearing.

[0008] In some embodiments, the eccentric shaft includes a first shaft segment, a second shaft segment, and a third shaft segment connected in sequence, the axis of the second shaft segment is spaced a first distance from the axis of the first shaft segment, the axis of the second shaft segment is spaced a second distance from the axis of the third shaft segment, and the axis of the first shaft segment is collinear with the axis of the third shaft segment.

[0009] In some embodiments, the connecting rod includes a rotating shaft portion and two second connecting portions, the two second connecting portions are relatively arranged at two ends of the rotating shaft portion, and the second connecting portion and the rotating shaft portion are integrally formed, the rotating shaft portion is rotatably connected to the bracket, and the second connecting portion is rotatably connected to the driving wheel.

[0010] In some embodiments, the bracket includes a first side wall, a second side wall, a third side wall and a fourth side wall connected in sequence, the first side wall, the second side wall, the third side wall and the fourth side wall enclose the installation space, and the first side wall is arranged opposite to the third side wall, the second side wall is arranged opposite to the fourth side wall, one end of the two connecting rods is rotatably connected to the first side wall and the third side wall respectively, and the second side wall and the fourth side wall are both provided with a first through hole for the eccentric shaft to pass through.

[0011] In some embodiments, the first side wall is provided with a first notch for installing one of the connecting rods, the third side wall is provided with a second notch for installing another of the connecting rods, the first notch and the second notch are centrally symmetrically arranged, the second side wall and the fourth side wall are both provided with a first mounting hole corresponding to the first notch and a second mounting hole corresponding to the second notch, one of the connecting rods is rotatably connected to the second side wall and the fourth side wall through the first mounting hole, and the other of the connecting rods is rotatably connected to the second side wall and the fourth side wall through the second mounting hole.

[0012] In some embodiments, a gasket is arranged between the bracket and the connecting rod, and the gasket is provided with a second through hole, a third mounting hole and a fourth mounting hole, the second through hole is arranged corresponding to the first through hole, the third mounting hole is arranged corresponding to the first mounting hole, and the fourth mounting hole is arranged corresponding to the second mounting hole.

[0013] In some embodiments, a push rod and a limiting portion are further included, the first side wall is provided with a limiting hole, the third side wall is provided with a third through hole, the limiting portion extends into the limiting hole, and the limiting portion is movably connected to the limiting hole, and the push rod is connected to the third side wall via the third through hole.

[0014] In some embodiments, a shell is further included, and the bracket is disposed in the shell.

[0015] Compared with the prior art, the double-connecting rod driving structure of the utility model has the following beneficial effects:

[0016] The connecting rods of the embodiment of the utility model serve to connect the bracket and the driving wheel. They are respectively located on both sides of the driving wheel, and one end of each connecting rod is rotatably connected to the bracket, and the other end is rotatably connected to the driving wheel to allow the connecting rod to swing freely within a certain range. When the eccentric shaft rotates, the driving wheel will make a linear reciprocating motion along a first direction. At the same time, the two connecting rods will float along a second direction (a swinging direction perpendicular to the first direction) according to the position change of the driving wheel, that is, the connecting rod will automatically adjust the angle according to the position of the driving wheel to ensure that the connecting rod can always provide the required pulling force or thrust to the driving wheel to help it achieve smooth linear reciprocating motion.

[0017] Based on the above structure, the connecting rod and the bracket of this embodiment are connected, and the connection point adopts a rotational connection. When the eccentric shaft moves up and down, the connecting rod will float freely to eliminate plane friction, thereby avoiding the problem of reduced stroke accuracy after wear. In addition, when the eccentric shaft moves up and down, the connecting rod will float freely, which will not interfere with the linear reciprocating trajectory and reduce the lateral force during linear reciprocating motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a double-link driving structure provided by an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the double-link driving structure provided by the embodiment of the utility model without the housing;

[0020] Figure 3 It is a schematic diagram of the structure of the driving wheel provided in an embodiment of the utility model;

[0021] Figure 4 It is a structural schematic diagram of an eccentric shaft provided by an embodiment of the utility model;

[0022] Figure 5 It is a structural schematic diagram of a connecting rod provided in an embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the structure of the bracket provided by the embodiment of the utility model;

[0024] Figure 7 It is a structural schematic diagram of a gasket provided in an embodiment of the utility model;

[0025] In the figure, 1, bracket; 11, installation space; 12, first side wall; 121, first notch; 122, limiting hole; 13, second side wall; 14, third side wall; 141, second notch; 15, fourth side wall; 16, first through hole; 17, first mounting hole; 18, second mounting hole; 2, connecting rod; 21, rotating shaft; 22, second connecting part; 3, eccentric shaft; 31, first shaft section; 32, second shaft section; 33, third shaft section; 4, driving wheel; 41, eccentric sleeve; 411, main body; 412, first connecting part; 42, bearing; 5, gasket; 51, second through hole; 52, third mounting hole; 53, fourth mounting hole; 6, push rod; 7, limiting part; 8, outer shell. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] like Figure 1 and Figure 2 As shown, the utility model provides a double-link driving structure, including a bracket 1, two connecting rods 2, an eccentric shaft 3 and a driving wheel 4. An installation space 11 is formed in the bracket 1, and the two connecting rods 2 and the driving wheel 4 are installed in the installation space 11. The two ends of the eccentric shaft 3 are respectively passed through two opposite side walls of the bracket 1, and the eccentric shaft 3 can rotate relative to the bracket 1. The driving wheel 4 structure is sleeved on the eccentric shaft 3, and the two connecting rods 2 are relatively arranged on both sides of the driving wheel 4. One end of the connecting rod 2 is rotatably connected to the bracket 1, and the other end of the connecting rod 2 is rotatably connected to the corresponding side of the driving wheel 4; when the eccentric shaft 3 drives the driving wheel 4 to reciprocate along the first direction, the connecting rod 2 floats along the second direction to provide corresponding pulling force or thrust for the reciprocating motion of the driving wheel 4.

[0028] The connecting rods 2 of this embodiment serve to connect the bracket 1 and the driving wheel 4. They are respectively located on both sides of the driving wheel 4, and one end of each connecting rod 2 is rotatably connected to the bracket 1, and the other end is rotatably connected to the driving wheel 4, so as to allow the connecting rod 2 to swing freely within a certain range. When the eccentric shaft 3 rotates, the driving wheel 4 will make a linear reciprocating motion along the first direction. At the same time, the two connecting rods 2 will float along the second direction (the swinging direction perpendicular to the first direction) according to the position change of the driving wheel 4, that is, the connecting rod 2 will automatically adjust the angle according to the position of the driving wheel 4 to ensure that the connecting rod 2 can always provide the required pulling force or thrust to the driving wheel 4, so as to help it achieve smooth linear reciprocating motion.

[0029] Based on the above structure, the connecting rod 2 and the bracket 1 of this embodiment are connected, and the connection point adopts a rotational connection. When the eccentric shaft 3 moves up and down, the connecting rod 2 will float freely to eliminate plane friction, thereby avoiding the problem of reduced stroke accuracy after wear. In addition, when the eccentric shaft 3 moves up and down, the connecting rod 2 will float freely, which will not interfere with the linear reciprocating trajectory and reduce the lateral force during linear reciprocating motion.

[0030] like Figure 3 As shown, the driving wheel 4 includes an eccentric sleeve 41 and a bearing 42. The eccentric sleeve 41 is sleeved on the circumferential side of the bearing 42, and the bearing 42 is sleeved on the circumferential side of the eccentric shaft 3 to reduce the friction between the eccentric sleeve 41 and the eccentric shaft 3, so that the eccentric shaft 3 and the eccentric sleeve 41 can rotate relatively smoothly, and at the same time withstand the radial force from the eccentric sleeve 41 to ensure the stable operation of the driving wheel 4, and the other end of the connecting rod 2 is rotatably connected to the corresponding side of the eccentric sleeve 41, so that the connecting rod 2 can swing freely around the connection point with the eccentric sleeve 41, ensuring that the connecting rod 2 can adapt to the position change of the eccentric sleeve 41 during reciprocating motion, and at the same time provide the eccentric sleeve 41 with necessary thrust or pulling force to push it to move along a predetermined straight path.

[0031] In some embodiments, the eccentric sleeve 41 includes a main body 411 and two first connecting parts 412. The two first connecting parts 412 are integrally formed with the main body 411 to ensure the strength and rigidity between the connecting parts and the main body 411, and the two first connecting parts 412 are centrally symmetrically distributed about the center of the main body 411 to balance the force and reduce vibration and instability during movement. The other end of the connecting rod 2 is rotatably connected to the corresponding first connecting part 412 to ensure that the connecting rod 2 can swing freely around the connection point with the first connecting part 412, and at the same time enable the connecting rod 2 to adapt to the position change of the eccentric sleeve 41 during the reciprocating motion, and at the same time ensure that the connecting rod 2 can effectively transmit thrust or tension. The main body 411 is sleeved on the peripheral side of the bearing 42 to reduce the friction between the eccentric sleeve 41 and the eccentric shaft 3, to ensure that the eccentric sleeve 41 can smoothly follow the rotation of the eccentric shaft 3, and at the same time withstand the radial force generated by the eccentric sleeve 41 during the movement.

[0032] In this embodiment, the eccentric sleeve 41 is connected to the connecting rod 2 through the two first connecting parts 412, and can effectively convert the rotational motion into linear reciprocating motion, while ensuring the smooth transmission of force, avoiding structural damage that may be caused by single-point force. At the same time, the use of the bearing 42 greatly reduces the friction between the eccentric sleeve 41 and the eccentric shaft 3, extending the service life of the components and improving the efficiency of the system.

[0033] like Figure 4As shown, the eccentric shaft 3 includes a first shaft section 31, a second shaft section 32 and a third shaft section 33 which are connected in sequence. The first shaft section 31 serves as the main shaft section of the eccentric shaft 3 and is connected to a driving source (such as a motor). Its axis is also the reference axis of the eccentric shaft 3. The second shaft section 32 is the eccentric part of the eccentric shaft 3. The distance between its axis and the axis of the first shaft section 31 is a first distance. The distance between the axis of the second shaft section 32 and the axis of the third shaft section 33 is a second distance. The axis of the first shaft section 31 and the axis of the third shaft section 33 are collinear to ensure the structural balance of the eccentric shaft 3.

[0034] Based on the above structure, when the eccentric shaft 3 rotates, the drive wheel 4 connected thereto will experience a non-circular motion trajectory, thereby generating an asymmetric linear reciprocating motion. It should be noted that the third shaft section 33 of this embodiment can also be used as the main shaft section of the eccentric shaft 3.

[0035] like Figure 5 As shown, the connecting rod 2 includes a rotating shaft portion 21 and two second connecting portions 22. The rotating shaft portion 21 is the main body of the connecting rod 2 and is in the shape of a straight rod. It is used to connect the two second connecting portions 22 and bear the main force transmission task. The two second connecting portions 22 are relatively arranged at the two ends of the rotating shaft portion 21, and the second connecting portions 22 and the rotating shaft portion 21 are integrally formed. The rotating shaft portion 21 is rotatably connected to the bracket 1 so that the connecting rod 2 can rotate freely on the bracket 1 to adapt to the change in the position of the driving wheel 4 caused by the movement of the eccentric shaft 3. The second connecting portion 22 is rotatably connected to the driving wheel 4 to ensure that the connecting rod 2 can change its angle accordingly with the reciprocating motion of the driving wheel 4, while providing the necessary thrust or pulling force for the driving wheel 4.

[0036] like Figure 6 As shown, the bracket 1 includes a first side wall 12, a second side wall 13, a third side wall 14 and a fourth side wall 15 connected in sequence, the first side wall 12, the second side wall 13, the third side wall 14 and the fourth side wall 15 enclose a mounting space 11, and the first side wall 12 is arranged opposite to the third side wall 14, the second side wall 13 is arranged opposite to the fourth side wall 15, one end of the two connecting rods 2 is rotatably connected to the first side wall 12 and the third side wall 14 respectively, and the second side wall 13 and the fourth side wall 15 are both provided with a first through hole 16 for the eccentric shaft 3 to pass through. Based on the above structure, the connecting rod 2 of this embodiment can swing freely within a certain range to adapt to the change of the position of the driving wheel 4, and provide the required thrust or pulling force for the driving wheel 4 at the same time.

[0037] In some embodiments, the first side wall 12 is provided with a first notch 121 for installing a connecting rod 2, the third side wall 14 is provided with a second notch 141 for installing another connecting rod 2, the first notch 121 and the second notch 141 are centrally symmetrically arranged, the second side wall 13 and the fourth side wall 15 are both provided with a first mounting hole 17 corresponding to the first notch 121 and a second mounting hole 18 corresponding to the second notch 141, one connecting rod 2 is rotatably connected to the second side wall 13 and the fourth side wall 15 through the first mounting hole 17, and the other connecting rod 2 is rotatably connected to the second side wall 13 and the fourth side wall 15 through the second mounting hole 18.

[0038] The symmetrical design of the first notch 121 and the second notch 141 of the present embodiment ensures that the two connecting rods 2 can be evenly distributed on both sides of the bracket 1. Such an arrangement helps to distribute the balancing force and reduce unbalanced vibration during movement. In addition, through the first mounting hole 17 and the second mounting hole 18, the connecting rod 2 can be rotatably connected with the second side wall 13 and the fourth side wall 15, ensuring that the connecting rod 2 can swing freely during movement to adapt to changes in the position of the driving wheel 4, while providing the required thrust or pulling force for the driving wheel 4.

[0039] like Figure 7 As shown, a gasket 5 is arranged between the bracket 1 and the connecting rod 2, and the gasket 5 is provided with a second through hole 51, a third mounting hole 52 and a fourth mounting hole 53. The second through hole 51 is arranged corresponding to the first through hole 16. When the gasket 5 is placed between the bracket 1 and the connecting rod 2, the eccentric shaft 3 can pass through the second through hole 51, ensuring that the gasket 5 does not hinder the normal rotation of the eccentric shaft 3. The third mounting hole 52 is arranged corresponding to the first mounting hole 17, and the fourth mounting hole 53 is arranged corresponding to the second mounting hole 18, which is used to rotatably connect one end of the connecting rod 2 to the bracket 1 through a pin shaft or other connecting parts, ensuring the accurate installation position of the connecting rod 2, while allowing the connecting rod 2 to swing freely within a certain range.

[0040] Based on the above structure, the use of the gasket 5 can reduce the direct contact between the connecting rod 2 and the bracket 1, avoid the hard friction between metals, thereby reducing wear and tear and extending the service life of the components.

[0041] In some embodiments, it also includes a push rod 6 and a limiting portion 7. The first side wall 12 is provided with a limiting hole 122, and the third side wall 14 is provided with a third through hole. The limiting portion 7 extends into the limiting hole, and the limiting portion 7 is movably connected to the limiting hole. The push rod 6 is connected to the third side wall 14 through the third through hole.

[0042] Based on the above structure, the travel of the driving wheel 4 is adjusted by dynamically adjusting the motion range of the connecting rod 2, and the extension or retraction of the push rod 6 is controlled to achieve the pushing or pulling action of the structure connected to the push rod 6. The limiter 7 can prevent the eccentric sleeve 41 from moving beyond the safe range, avoiding structural damage or system failure caused by excessive travel.

[0043] In some embodiments, a housing 8 is also included, and the bracket 1 is arranged in the housing 8 to prevent external pollutants such as dust, moisture, and impurities from entering the interior, protect precision mechanical and electrical components from damage, and extend the service life of the system. At the same time, the housing 8 can serve as a physical barrier to prevent operators from accidentally contacting high-speed rotating or moving parts when the machine is running, thereby reducing the risk of work-related accidents.

[0044] In summary, the embodiment of the utility model provides a double-link driving structure, wherein the connecting rod 2 serves to connect the bracket 1 and the driving wheel 4, which are respectively located on both sides of the driving wheel 4, and one end of each connecting rod 2 is rotationally connected to the bracket 1, and the other end is rotationally connected to the driving wheel 4, so as to allow the connecting rod 2 to swing freely within a certain range. When the eccentric shaft 3 rotates, the driving wheel 4 will make a linear reciprocating motion along the first direction. At the same time, the two connecting rods 2 will float along the second direction (the swinging direction perpendicular to the first direction) according to the position change of the driving wheel 4, that is, the connecting rod 2 will automatically adjust the angle according to the position of the driving wheel 4 to ensure that the connecting rod 2 can always provide the required pulling force or thrust to the driving wheel 4, and help it to achieve smooth linear reciprocating motion. Based on the above structure, the connecting rod 2 and the bracket 1 of this embodiment are connected, and the connection point adopts a rotational connection. When the eccentric shaft 3 moves up and down, the connecting rod 2 will float freely to eliminate plane friction, thereby avoiding the problem of reduced stroke accuracy after wear. In addition, when the eccentric shaft 3 moves up and down, the connecting rod 2 will float freely, which will not interfere with the linear reciprocating trajectory and reduce the lateral force during linear reciprocating motion.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A double-link driving structure, characterized in that: It comprises a bracket, two connecting rods, an eccentric shaft and a driving wheel, wherein an installation space is formed in the bracket, the two connecting rods and the driving wheel are installed in the installation space, the two ends of the eccentric shaft are respectively arranged through two opposite side walls of the bracket, and the eccentric shaft can rotate relative to the bracket, the driving wheel structure is sleeved on the eccentric shaft, the two connecting rods are relatively arranged on both sides of the driving wheel, one end of the connecting rod is rotatably connected to the bracket, and the other end of the connecting rod is rotatably connected to the corresponding side of the driving wheel; When the eccentric shaft drives the driving wheel to reciprocate along the first direction, the connecting rod floats along the second direction to provide corresponding pulling force or pushing force for the reciprocating motion of the driving wheel.

2. The double-link driving structure according to claim 1, characterized in that: The driving wheel includes an eccentric sleeve and a bearing. The bearing is sleeved on the circumferential side of the eccentric shaft, the eccentric sleeve is sleeved on the circumferential side of the bearing, and the other end of the connecting rod is rotatably connected to the corresponding side of the eccentric sleeve.

3. The double-link driving structure according to claim 2, characterized in that: The eccentric sleeve includes a main body and two first connecting parts, the two first connecting parts are integrally formed with the main body, and the two first connecting parts are centrally symmetrically distributed about the center of the main body, the other end of the connecting rod is rotatably connected to the corresponding first connecting part, and the main body is sleeved on the circumferential side of the bearing.

4. The double-link driving structure according to claim 1, characterized in that: The eccentric shaft includes a first shaft segment, a second shaft segment and a third shaft segment connected in sequence, the axis of the second shaft segment is at a first distance from the axis of the first shaft segment, the axis of the second shaft segment is at a second distance from the axis of the third shaft segment, and the axis of the first shaft segment is collinear with the axis of the third shaft segment.

5. The double-link driving structure according to claim 1, characterized in that: The connecting rod includes a rotating shaft portion and two second connecting portions, the two second connecting portions are relatively arranged at two ends of the rotating shaft portion, and the second connecting portion and the rotating shaft portion are integrally formed, the rotating shaft portion is rotatably connected to the bracket, and the second connecting portion is rotatably connected to the driving wheel.

6. The double-link driving structure according to claim 1, characterized in that: The bracket includes a first side wall, a second side wall, a third side wall and a fourth side wall which are connected in sequence, the first side wall, the second side wall, the third side wall and the fourth side wall enclose the installation space, and the first side wall is arranged opposite to the third side wall, the second side wall is arranged opposite to the fourth side wall, one end of the two connecting rods are rotatably connected to the first side wall and the third side wall respectively, and the second side wall and the fourth side wall are both provided with a first through hole for the eccentric shaft to pass through.

7. The double-link driving structure according to claim 6, characterized in that: The first side wall is provided with a first notch for installing one of the connecting rods, the third side wall is provided with a second notch for installing another of the connecting rods, the first notch and the second notch are centrally symmetrically arranged, the second side wall and the fourth side wall are both provided with a first mounting hole corresponding to the first notch and a second mounting hole corresponding to the second notch, one of the connecting rods is rotatably connected to the second side wall and the fourth side wall through the first mounting hole, and the other of the connecting rods is rotatably connected to the second side wall and the fourth side wall through the second mounting hole.

8. The double-link driving structure according to claim 7, characterized in that: A gasket is arranged between the bracket and the connecting rod, and the gasket is provided with a second through hole, a third mounting hole and a fourth mounting hole. The second through hole is arranged corresponding to the first through hole, the third mounting hole is arranged corresponding to the first mounting hole, and the fourth mounting hole is arranged corresponding to the second mounting hole.

9. The double-link driving structure according to claim 7, characterized in that: It also includes a push rod and a limiting portion, the first side wall is provided with a limiting hole, the third side wall is provided with a third through hole, the limiting portion extends into the limiting hole, and the limiting portion is movably connected to the limiting hole, and the push rod is connected to the third side wall via the third through hole.

10. The double-link driving structure according to claim 1, characterized in that: It also includes a shell, and the bracket is arranged in the shell.

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