Central control screen multi-degree-of-freedom movement mechanism

Abstract

The utility model discloses a kind of central control screen multi-degree-of-freedom motion mechanism, including central control screen, still include: support frame, the support frame is located at the rear of the central control screen;First push rod, the first push rod is set in the support frame and one end of first push rod is stretched out from one end of the support frame;Second push rod, the second push rod is set in the support frame and one end of second push rod is stretched out from one end of the support frame, the first push rod and second push rod are left and right interval arrangement;First drive component, the first drive component is used to drive the first push rod move back and forth;Second drive component, the second drive component is used to drive the second push rod move back and forth;Support structure;First connecting structure;Second connecting structure.The utility model can realize the left and right angle and up and down angle of central control screen are adjusted, it is convenient for different height driver to watch the content on central control screen, improve the user experience of user.

Description

Technical Field

[0001] This utility model relates to the field of automotive central control screen technology, specifically to a multi-degree-of-freedom motion mechanism for a central control screen. Background Technology

[0002] With the rapid development of the automotive industry, in order to meet drivers' needs for route navigation while driving, display devices are usually installed on the dashboard, using the central control screen of the display device to display routes for drivers to navigate. However, the central control screen of existing display devices is fixed to the dashboard, and the horizontal and vertical angles of the central control screen cannot be adjusted, making it inconvenient for drivers of different heights to view the content on the central control screen, thus reducing the user experience. Utility Model Content

[0003] To overcome the shortcomings of the existing technology, this utility model provides a multi-degree-of-freedom motion mechanism for the central control screen, which can adjust the left and right angles and the up and down angles of the central control screen, making it easier for drivers of different heights to view the content on the central control screen and improving the user experience.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A multi-degree-of-freedom motion mechanism for a central control screen includes a central control screen and further includes: a support frame located behind the central control screen; a first push rod disposed within the support frame with one end extending from one end of the support frame; a second push rod disposed within the support frame with one end extending from one end of the support frame, the first and second push rods being spaced apart laterally; a first drive assembly for driving the first push rod to move back and forth; a second drive assembly for driving the second push rod to move back and forth; and a support structure located above the first and second push rods, one end of the support structure being disposed at one end of the support frame, and the other end of the support structure being connected to the back of the central control screen, the central control screen being movable left and right relative to the support frame via the support structure. The support structure can rotate and rotate up and down, or one end of the support structure is hinged to one end of the support frame, and the other end of the support structure is omnidirectionally connected to the back of the central control screen, allowing the support structure to rotate up and down relative to the support frame; a first connecting structure, one end of the first connecting structure is omnidirectionally connected to one end of the first push rod, and the other end of the first connecting structure is omnidirectionally connected to the back of the central control screen, or the other end of the first connecting structure is hinged to the back of the central control screen, allowing the central control screen to rotate left and right relative to the first connecting structure; a second connecting structure, one end of the second connecting structure is omnidirectionally connected to one end of the second push rod, and the other end of the second connecting structure is omnidirectionally connected to the back of the central control screen, or the other end of the second connecting structure is hinged to the back of the central control screen, allowing the central control screen to rotate left and right relative to the second connecting structure.

[0006] As a preferred technical solution, the support structure includes a first hinge component and a second hinge component. One end of the first hinge component is disposed at one end of the support frame, and the first hinge component and the support frame are relatively fixed. The other end of the first hinge component is hinged to one end of the second hinge component through a first support hinge shaft. The second hinge component can rotate left and right relative to the first hinge component. The other end of the second hinge component is hinged to the back of the central control screen through a second support hinge shaft. The central control screen can rotate up and down relative to the second hinge component.

[0007] As a preferred technical solution, the first connection structure includes a first connector, a first push rod ball joint, and a first connecting ball joint. One end of the first connector is rotatably connected to one end of the first push rod through the first push rod ball joint, and the other end of the first connector is rotatably connected to the back of the central control screen through the first connecting ball joint.

[0008] As a preferred technical solution, the second connection structure includes a second connector, a second push rod ball joint, and a second connecting ball joint. One end of the second connector is rotatably connected to one end of the second push rod via the second push rod ball joint, and the other end of the second connector is rotatably connected to the back of the central control screen via the second connecting ball joint.

[0009] As a preferred technical solution, the support structure includes a support member and a support ball joint. One end of the support member is hinged to one end of the support frame via a third support hinge shaft. The support member can rotate up and down relative to the support frame. The other end of the support member is omnidirectionally connected to the back of the central control screen via the support ball joint.

[0010] As a preferred technical solution, the first connection structure includes a first connector and a first push rod ball joint. One end of the first connector is omnidirectionally connected to one end of the first push rod through the first push rod ball joint. The other end of the first connector is hinged to the back of the central control screen through a first connecting hinge shaft. The central control screen can rotate left and right relative to the first connector.

[0011] As a preferred technical solution, the second connection structure includes a second connector and a second push rod ball joint. One end of the second connector is omnidirectionally connected to one end of the second push rod via the second push rod ball joint. The other end of the second connector is hinged to the back of the central control screen via a second connecting hinge shaft. The central control screen can rotate left and right relative to the second connector.

[0012] As a preferred technical solution, the multi-degree-of-freedom motion mechanism of the central control screen further includes a control board, and the first drive component and the second drive component are both electrically connected to the control board.

[0013] As a preferred technical solution, the first drive assembly includes a first drive motor, a first gear structure, and a first lead screw structure. The first drive motor is disposed within the support frame and electrically connected to the control board. The other end of the support frame is provided with a gearbox. The output end of the first drive motor extends into the gearbox and is connected to the first gear structure. The first lead screw structure includes a first lead screw and a first nut. The first lead screw passes through the gearbox and is rotatably connected to the gearbox. One end of the first lead screw is located outside the gearbox, and the other end of the first lead screw extends into the support frame. The first lead screw is connected to the first gear structure. A first push rod is arranged around the outer periphery of the first lead screw. The first nut is threadedly engaged with the first lead screw and fixedly sleeved within the first push rod. The first drive motor is used to drive the first lead screw to rotate through the first gear structure, thereby driving the first nut to move back and forth, and further driving the first push rod to move back and forth.

[0014] As a preferred technical solution, the second drive assembly includes a second drive motor, a second gear structure, and a second lead screw structure. The second drive motor is disposed within the support frame and electrically connected to the control board. The output end of the second drive motor extends into the gearbox and is connected to the second gear structure. The second lead screw structure includes a second lead screw and a second nut. The second lead screw passes through the gearbox and is rotatably connected to the gearbox. One end of the second lead screw is located outside the gearbox, and the other end extends into the support frame. The second lead screw is connected to the second gear structure. The second push rod is arranged around the outer periphery of the second lead screw. The second nut is threadedly engaged with the second lead screw and fixedly sleeved within the second push rod. The second drive motor drives the second lead screw to rotate through the second gear structure, thereby driving the second nut to move back and forth, and further driving the second push rod to move back and forth.

[0015] As a preferred technical solution, the gearbox body has a mounting shell at the end away from the support frame, the mounting shell has an opening at the end near the gearbox body, the control board is disposed inside the mounting shell, and one end of the first lead screw and one end of the second lead screw both pass through the opening of the mounting shell and are located inside the mounting shell.

[0016] As a preferred technical solution, both the first gear structure and the second gear structure include a motor gear, a first double gear, a second double gear, a third double gear, and a drive gear disposed within the gearbox body. The motor gear of the first gear structure is sleeved on the outer periphery of the output end of the first drive motor, and the motor gear of the second gear structure is sleeved on the outer periphery of the output end of the second drive motor. The large gear of the first double gear meshes with the motor gear, the small gear of the first double gear meshes with the large gear of the second double gear, the small gear of the second double gear meshes with the large gear of the third double gear, and the drive gear meshes with the large gear of the third double gear. The drive gear of the first gear structure is sleeved on the outer periphery of the first lead screw, and the drive gear of the second gear structure is sleeved on the outer periphery of the second lead screw.

[0017] As a preferred technical solution, both the first gear structure and the second gear structure include a first signal gear and a second signal gear. The first signal gear is a double gear and is disposed in the gearbox. The large gear of the first signal gear meshes with the small gear of the third double gear. The end of the gearbox away from the support frame is provided with a mounting groove corresponding to the second signal gear. The mounting groove communicates with the interior of the gearbox. The second signal gear is disposed in the mounting groove and meshes with the small gear of the first signal gear. The second signal gear is provided with a magnet. The magnet is located in the opening at the top of the mounting shell and is opposite to the magnetic encoder on the control board.

[0018] As a preferred technical solution, the support frame is provided with a first inner cavity and a second inner cavity, which are arranged left and right at intervals. One end of the support frame is provided with a first through hole communicating with the first inner cavity and a second through hole communicating with the second inner cavity. The other end of the support frame is provided with a third through hole communicating with the first inner cavity and a fourth through hole communicating with the second inner cavity. The other end of the first lead screw extends into the first inner cavity through the third through hole, and the other end of the second lead screw extends into the second inner cavity through the fourth through hole. The first push rod is disposed in the first inner cavity, with one end of the first push rod extending out of the first through hole. A first flexible ring is provided on the outer periphery of the first push rod, and the first flexible ring abuts against the inner wall of the first inner cavity. The second push rod is disposed in the second inner cavity, with one end of the second push rod extending out of the second through hole. A second flexible ring is provided on the outer periphery of the second push rod, and the second flexible ring abuts against the inner wall of the second inner cavity.

[0019] The beneficial effects of this utility model are as follows: Through the set support frame, first push rod, second push rod, first drive component, second drive component, support structure, first connecting structure and second connecting structure, this utility model can drive the central control screen to rotate left, right, up and down, thereby realizing the adjustment of the left and right angle and the up and down angle of the central control screen, making it easier for drivers of different heights to view the content on the central control screen and improving the user experience. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the first angle of a multi-degree-of-freedom motion mechanism for a central control screen provided in the first embodiment of this utility model;

[0022] Figure 2 yes Figure 1 The diagram shows the second angle of the multi-degree-of-freedom motion mechanism of the central control screen.

[0023] Figure 3 yes Figure 1 The left-side view of the multi-degree-of-freedom motion mechanism of the central control screen is shown.

[0024] Figure 4 yes Figure 1 The diagram shows the structure of the multi-degree-of-freedom motion mechanism of the central control screen at the first angle after removing the central control screen.

[0025] Figure 5 yes Figure 1 The diagram shows the second angle of the multi-degree-of-freedom motion mechanism of the central control screen after the central control screen is removed.

[0026] Figure 6 yes Figure 1 A cross-sectional view of the multi-degree-of-freedom motion mechanism of the central control screen after the central control screen has been removed.

[0027] Figure 7 yes Figure 6 A magnified view of a portion of point A shown;

[0028] Figure 8 yes Figure 1 The diagram shows the structural design of the support frame, support structure, and hinge seat of the multi-degree-of-freedom motion mechanism of the central control screen.

[0029] Figure 9 yes Figure 1 The diagram shows the structure of the first push rod, second push rod, first drive assembly, second drive assembly, control board, gearbox, and mounting shell of the multi-degree-of-freedom motion mechanism of the central control screen.

[0030] Figure 10 yes Figure 1 The diagram shows the structure of the first push rod, second push rod, first drive assembly, second drive assembly, control board, and mounting shell of the multi-degree-of-freedom motion mechanism of the central control screen.

[0031] Figure 11 yes Figure 1 A schematic diagram of the structure of the first push rod, the second push rod, the first drive assembly, and the second drive assembly of the multi-degree-of-freedom motion mechanism of the central control screen shown;

[0032] Figure 12 yes Figure 1 The diagram shows the structure of the first push rod part, the second push rod part, the first drive assembly, and the second drive assembly of the multi-degree-of-freedom motion mechanism of the central control screen.

[0033] Figure 13 yes Figure 1 The diagram shows the structure of the first gear structure of the first drive component and the second gear structure of the second drive component of the multi-degree-of-freedom motion mechanism of the central control screen.

[0034] Figure 14 yes Figure 1 The diagram shows a cross-sectional view of the support frame, first drive assembly, second drive assembly, and gearbox of the multi-degree-of-freedom motion mechanism of the central control screen.

[0035] Figure 15 yes Figure 1 The diagram shows the structure of the support frame, first drive assembly, second drive assembly, and gearbox of the multi-degree-of-freedom motion mechanism of the central control screen.

[0036] Figure 16 This is a schematic diagram of the first angle of a multi-degree-of-freedom motion mechanism for a central control screen provided in the second embodiment of this utility model;

[0037] Figure 17 yes Figure 16 The diagram shows the second angle of the multi-degree-of-freedom motion mechanism of the central control screen.

[0038] Figure 18 yes Figure 16 The diagram shows the structure of the multi-degree-of-freedom motion mechanism of the central control screen after removing the central control screen and the connecting seat.

[0039] Figure 19 yes Figure 16 The diagram shows the support frame and support structure of the multi-degree-of-freedom motion mechanism of the central control screen after removing the support ball joint.

[0040] Figure label:

[0041] 10. Central control screen; 11. Connecting bracket; 12. Support bracket; 13. First mounting bracket; 14. Second mounting bracket; 15. Base; 16. First hinge bracket; 17. Second hinge bracket;

[0042] 20. Support frame; 21. Support structure; 211. First hinge component; 212. Second hinge component; 213. Support member; 2141. Support ball head; 2142. Support ball head seat; 22. First inner cavity; 23. Second inner cavity; 24. First mounting cavity; 25. Second mounting cavity; 26. Support hinge part;

[0043] 30. First push rod; 31. First connecting structure; 311. First connector; 3121. First push rod ball head; 3122. First push rod ball head seat; 3131. First connecting ball head; 3132. First connecting ball head seat; 32. First nut; 33. First flexible ring;

[0044] 40. Second push rod; 41. Second connecting structure; 411. Second connector; 4121. Second push rod ball head; 4122. Second push rod ball head seat; 4131. Second connecting ball head; 4132. Second connecting ball head seat; 42. Second nut; 43. Second flexible ring;

[0045] 50. First drive assembly; 51. First drive motor; 52. First gear structure; 521. Motor gear; 522. First double gear; 5221. Gear shaft of the first double gear; 523. Second double gear; 5231. Gear shaft of the second double gear; 524. Third double gear; 5241. Gear shaft of the third double gear; 525. Drive gear; 526. First signal gear; 5261. Gear shaft of the first signal gear; 527. Second signal gear; 5271. Gear shaft of the second signal gear; 5272. Magnet; 528. Gear mounting plate; 531. First lead screw; 5311. First bushing; 5312. First bearing; 532. Second nut;

[0046] 60. Second drive assembly; 61. Second drive motor; 62. Second gear structure; 631. Second lead screw; 6311. Second bushing; 6312. Second bearing; 632. Second nut;

[0047] 70. Control panel; 71. First clearance hole; 72. Second clearance hole;

[0048] 80. Gearbox housing; 81. Mounting slot;

[0049] 90. Install the casing. Detailed Implementation

[0050] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0051] First Embodiment

[0052] Please refer to Figures 1 to 6The first embodiment of this utility model provides a multi-degree-of-freedom motion mechanism for a central control screen, including a central control screen 10, a support frame 20, a first push rod 30, a second push rod 40, a first drive assembly 50, a second drive assembly 60, a support structure 21, a first connecting structure 31, and a second connecting structure 41.

[0053] The support frame 20 is located behind the central control screen 10. In practical applications, the support frame 20 is mounted on the vehicle body. The first push rod 30 and the second push rod 40 are spaced apart along the length of the central control screen 10 and are respectively housed within the support frame 20. One end of the first push rod 30 and one end of the second push rod 40 extend from one end of the support frame 20. The first drive assembly 50 drives the first push rod 30 to move back and forth, and the second drive assembly 60 drives the second push rod 40 to move back and forth. The support structure 21 is located above the first push rod 30 and the second push rod 40. One end of the support structure 21 is attached to one end of the support frame 20, and the other end is connected to the back of the central control screen 10. The central control screen 10 can rotate left and right and up and down relative to the support frame 20 via the support structure 21. One end of the first connecting structure 31 is omnidirectionally connected to one end of the first push rod 30, and the other end of the first connecting structure 31 is omnidirectionally connected to the back of the central control screen 10, thus providing the central control screen 10 with multiple degrees of freedom of rotation. One end of the second connecting structure 41 is omnidirectionally connected to one end of the second push rod 40, and the other end of the second connecting structure 41 is omnidirectionally connected to the back of the central control screen 10, thus providing the central control screen 10 with multiple degrees of freedom of rotation. When the first push rod 30 moves forward and the second push rod 40 moves backward, the central control screen 10 can be rotated to the right relative to the support frame 20 through the first connecting structure 31 and the second connecting structure 41. When the first push rod 30 moves backward and the second push rod 40 moves forward, the central control screen 10 can be rotated to the left relative to the support frame 20 through the first connecting structure 31 and the second connecting structure 41. When the first push rod 30 moves forward and the second push rod 40 moves forward, the central control screen 10 can be rotated upward relative to the support frame 20 through the first connecting structure 31 and the second connecting structure 41. When the first push rod 30 moves backward and the second push rod 40 moves backward, the central control screen 10 can be rotated downward relative to the support frame 20 through the first connecting structure 31 and the second connecting structure 41. The support frame 20 and support structure 21 can provide support for the central control screen 10, allowing the central control screen 10 to be suspended at the current angle and preventing the central control screen 10 from shaking.

[0054] Specifically, in combination Figures 7 to 9As shown, the support structure 21 includes a first hinge component 211 and a second hinge component 212. One end of the first hinge component 211 is disposed at one end of the support frame 20. The first hinge component 211 and the support frame 20 are fixed relative to each other. The other end of the first hinge component 211 is hinged to one end of the second hinge component 212 through a first support hinge shaft. The second hinge component 212 can rotate left and right relative to the first hinge component 211. The other end of the second hinge component 212 is hinged to the back of the central control screen 10 through a second support hinge shaft. The central control screen 10 can rotate up and down relative to the second hinge component 212.

[0055] The first connecting structure 31 includes a first connecting member 311, a first push rod ball joint, and a first connecting ball joint. One end of the first connecting member 311 is rotatably connected to one end of the first push rod 30 via the first push rod ball joint, and the other end of the first connecting member 311 is rotatably connected to the back of the central control screen 10 via the first connecting ball joint. The second connecting structure 41 includes a second connecting member 411, a second push rod ball joint, and a second connecting ball joint. One end of the second connecting member 411 is rotatably connected to one end of the second push rod 40 via the second push rod ball joint, and the other end of the second connecting member 411 is rotatably connected to the back of the central control screen 10 via the second connecting ball joint.

[0056] In this embodiment, a connecting seat 11 is provided on the back of the central control screen 10, and a support seat 12 is provided on the connecting seat 11. The other end of the second hinge component 212 is hinged to the support seat 12 through the second support hinge shaft.

[0057] The connecting seat 11 is provided with a first mounting seat 13 and a second mounting seat 14. The first mounting seat 13 and the second mounting seat 14 are arranged at left and right intervals along the length direction of the connecting seat 11. The other end of the first connecting member 311 is rotatably connected to the first mounting seat 13 through a first connecting ball joint. The other end of the second connecting member 411 is rotatably connected to the second mounting seat 14 through a second connecting ball joint.

[0058] In this embodiment, the first push rod ball joint includes a first push rod ball head 3121 and a first push rod ball head seat 3122. One end of the first push rod 30 is threadedly connected to a first nut 32. The first push rod ball head 3121 is housed within the first nut 32. The first push rod ball head seat 3122 is fixed within the first nut 32 and surrounds the periphery of the first push rod ball head 3121. The first push rod ball head 3121 can rotate omnidirectionally relative to the first push rod ball head seat 3122. One end of the first connecting member 311 extends into the first nut 32 and connects to the first push rod ball head 3121. The first nut 32 provides mounting support for the first push rod ball head seat 3122.

[0059] The first connecting ball joint includes a first connecting ball head 3131 and a first connecting ball head seat 3132. A first groove is provided at the end of the first mounting base 13 away from the connecting base 11. The first connecting ball head 3131 is housed within the first groove. The first connecting ball head seat 3132 is fixed within the first groove and surrounds the first connecting ball head 3131. The first connecting ball head 3131 can rotate omnidirectionally relative to the first connecting ball head seat 3132. The other end of the first connecting member 311 is connected to the first connecting ball head 3131. The first mounting base 13 provides mounting support for the first connecting ball head seat 3132.

[0060] The second push rod ball joint includes a second push rod ball head 4121 and a second push rod ball head seat 4122. One end of the second push rod 40 is threadedly connected to a second nut 42. The second push rod ball head 4121 is housed within the second nut 42. The second push rod ball head seat 4122 is fixed within the second nut 42 and surrounds the second push rod ball head 4121. The second push rod ball head 4121 can rotate omnidirectionally relative to the second push rod ball head seat 4122. One end of the second connecting member 411 extends into the second nut 42 and connects to the second push rod ball head 4121. The second nut 42 provides mounting support for the second push rod ball head seat 4122.

[0061] The second connecting ball joint includes a second connecting ball head 4131 and a second connecting ball head seat 4132. The two ends of the second mounting base 14 furthest from the connecting base 11 are provided with second grooves. The second connecting ball head 4131 is accommodated within the second grooves. The second connecting ball head seat 4132 is fixed within the second grooves and surrounds the second connecting ball head 4131. The second connecting ball head 4131 can rotate omnidirectionally relative to the second connecting ball head seat 4132. The other end of the second connecting member 411 is connected to the second connecting ball head 4131. The second mounting base 14 provides mounting support for the second connecting ball head seat 4132.

[0062] With the above structure, when it is necessary to adjust the left and right angles of the central control screen 10, the first drive assembly 50 drives the first push rod 30 to move forward and the second drive assembly 60 drives the second push rod 40 to move backward, or the first drive assembly 50 drives the first push rod 30 to move backward and the second drive assembly 60 drives the second push rod 40 to move forward. Thus, the first connecting structure 31 and the second connecting structure 41 can drive the central control screen 10 and the second hinge component 212 to rotate to the right or left relative to the first hinge component 211 and the support frame 20, thereby realizing the adjustment of the left and right angles of the central control screen 10.

[0063] When it is necessary to adjust the vertical angle of the central control screen 10, the first drive assembly 50 drives the first push rod 30 to move forward and the second drive assembly 60 drives the second push rod 40 to move forward, or the first drive assembly 50 drives the first push rod 30 to move backward and the second drive assembly 60 drives the second push rod 40 to move backward. Thus, the first connecting structure 31 and the second connecting structure 41 can drive the central control screen 10 to rotate upward or downward relative to the first hinge component 211, the second hinge component 212 and the support frame 20, thereby realizing the adjustment of the vertical angle of the central control screen 10.

[0064] This utility model, through the provided support frame 20, first push rod 30, second push rod 40, first drive assembly 50, second drive assembly 60, support structure 21, first connecting structure 31 and second connecting structure 41, can drive the central control screen 10 to rotate left, right, up and down, thereby enabling adjustment of the left-right angle and up-down angle of the central control screen 10, making it easier for drivers of different heights to view the content on the central control screen 10 and improving the user experience.

[0065] Combination Figures 9 to 15 As shown, the multi-degree-of-freedom motion mechanism of the central control screen also includes a control board 70, i.e., a PCBA board. The first drive assembly 50 and the second drive assembly 60 are both electrically connected to the control board 70. The control board 70 is used to control the operation of the first drive assembly 50 and the second drive assembly 60.

[0066] The first drive assembly 50 includes a first drive motor 51, a first gear structure 52, and a first lead screw structure. The first gear structure 52 serves to reduce speed. The first drive motor 51 is housed within the support frame 20 and electrically connected to the control board 70, which controls the operation of the first drive motor 51. A gearbox 80 is located at the other end of the support frame 20. The output end of the first drive motor 51 extends into the gearbox 80 and is connected to the first gear structure 52. The first lead screw structure includes a first lead screw 531 and a T-shaped first nut 532. The first lead screw 531 passes through the gearbox 80 and is rotatably connected to it. One end of the first lead screw 531 is located outside the gearbox 80, and the other end extends into the support frame 20. The first lead screw 531 is connected to the first gear structure 52. The first push rod 30 is encircled on the outer periphery of the first lead screw 531. The first nut 532 is threadedly engaged with the first lead screw 531 and fixedly sleeved inside the first push rod 30, with a portion of the first nut 532 protruding from the other end of the first push rod 30. The first drive motor 51 drives the first lead screw 531 to rotate via the first gear structure 52, thereby causing the first nut 532 to move back and forth, and consequently, the first push rod 30 to move back and forth. The first drive motor 51 is controlled to rotate via the control board 70, thus driving the first lead screw 531 to rotate via the first gear structure 52. The first drive motor 51 is also controlled to stop rotating via the control board 70, thus stopping the first lead screw 531 from rotating via the first gear structure 52.

[0067] The second drive assembly 60 includes a second drive motor 61, a second gear structure 62, and a second lead screw structure. The second gear structure 62 serves to reduce speed. The second drive motor 61 is housed within the support frame 20 and electrically connected to the control board 70, which controls the operation of the second drive motor 61. The output end of the second drive motor 61 extends into the gearbox 80 and is connected to the second gear structure 62. The second lead screw structure includes a second lead screw 631 and a T-shaped second nut 632. The second lead screw 631 passes through the gearbox 80 and is rotatably connected to it. The first lead screw 531 and the second lead screw 631 are spaced apart. One end of the second lead screw 631 is located outside the gearbox 80, and the other end extends into the support frame 20. The second lead screw 631 is connected to the second gear structure 62. A second push rod 40 is arranged around the outer periphery of the second lead screw 631. The second nut 632 is threadedly engaged with the second lead screw 631 and fixedly sleeved inside the second push rod 40, with a portion of the second nut 632 protruding from the other end of the second push rod 40. The second drive motor 61 drives the second lead screw 631 to rotate via the second gear structure 62, thereby causing the second nut 632 to move back and forth, and consequently, the second push rod 40 to move back and forth. The control board 70 controls the rotation of the second drive motor 61, thus driving the second lead screw 631 to rotate via the second gear structure 62. The control board 70 also controls the second drive motor 61 to stop rotating, thus stopping the second lead screw 631 from rotating via the second gear structure 62.

[0068] The first drive assembly 50 adopts a first gear structure 52 and a first lead screw structure, and the second drive assembly 60 adopts a second gear structure 62 and a second lead screw structure, which can realize stepless adjustment of the angle of the central control screen 10, so that the central control screen 10 can be suspended at any position with high precision, thereby enabling precise adjustment of the angle of the central control screen 10.

[0069] In this embodiment, the support frame 20 is provided with a first mounting cavity 24 and a second mounting cavity 25, such as Figure 5 As shown, the first mounting cavity 24 and the second mounting cavity 25 are arranged at left and right intervals. The other end of the support frame 20 is provided with a first hole communicating with the first mounting cavity 24 and a second hole communicating with the second mounting cavity 25. The end of the gearbox 80 near the support frame 20 is provided with a third hole and a fourth hole communicating with the interior of the gearbox 80. The output end of the first drive motor 51 extends into the gearbox 80 through the first hole and the third hole, and the output end of the second drive motor 61 extends into the gearbox 80 through the second hole and the fourth hole.

[0070] Both the first drive motor 51 and the second drive motor 61 are brushless motors, i.e., brushless motors. Brushless motors can achieve higher speeds and greater torque, further improving transmission speed and load torque. Furthermore, brushless motors have a long service life, reducing the frequency of replacement and maintenance, and lowering operating costs. It is understandable that the first drive motor 51 and the second drive motor 61 could also be, for example, brushed motors.

[0071] In this embodiment, the gearbox 80 has a first through hole and a second through hole communicating with the interior of the gearbox 80 at one end near the support frame 20 and the other end away from the support frame 20, respectively. The first lead screw 531 passes through the first through hole, the interior of the gearbox 80, and the second through hole, and is rotatably connected to the first and second through holes. Specifically, a T-shaped first bushing 5311 is provided in the first through hole, and the first bushing 5311 is sleeved on the outer periphery of the first lead screw 531. A first bearing 5312 is provided in the second through hole, and the first bearing 5312 is sleeved on the outer periphery of the first lead screw 531.

[0072] The gearbox 80 has a third through hole and a fourth through hole at one end near the support frame 20 and the other end away from the support frame 20, respectively, which communicate with the interior of the gearbox 80. The second lead screw 631 passes through the third through hole, the interior of the gearbox 80, and the fourth through hole, and is rotatably connected to the third and fourth through holes. Specifically, a T-shaped second bushing 6311 is provided in the third through hole, and the second bushing 6311 is fitted around the outer periphery of the second lead screw 631. A second bearing 6312 is provided in the fourth through hole, and the second bearing 6312 is fitted around the outer periphery of the second lead screw 631.

[0073] A mounting shell 90 is provided at the end of the gearbox 80 away from the support frame 20. In practical applications, the mounting shell 90 is mounted on the vehicle body. The end of the mounting shell 90 closest to the gearbox 80 is open, and the control board 70 is housed inside the mounting shell 90. One end of the first lead screw 531 and one end of the second lead screw 631 both pass through the opening of the mounting shell 90 and are located inside the mounting shell 90. The control board 70 has a first clearance hole 71 for accommodating one end of the first lead screw 531 and a second clearance hole 72 for accommodating one end of the second lead screw 631. The mounting shell 90 provides mounting support for the control board 70 and also protects it.

[0074] The support frame 20 has a first inner cavity 22 and a second inner cavity 23, which are spaced apart from each other. One end of the support frame 20 has a first through hole communicating with the first inner cavity 22 and a second through hole communicating with the second inner cavity 23. The other end of the support frame 20 has a third through hole communicating with the first inner cavity 22 and a fourth through hole communicating with the second inner cavity 23. The other end of the first lead screw 531 extends into the first inner cavity 22 through the third through hole, and the other end of the second lead screw 631 extends into the second inner cavity 23 through the fourth through hole. The first push rod 30 is disposed in the first inner cavity 22, and one end of the first push rod 30 extends out of the first through hole. A first flexible ring 33 is provided on the outer periphery of the first push rod 30, and the first flexible ring 33 abuts against the inner wall of the first inner cavity 22. The second push rod 40 is disposed within the second inner cavity 23, with one end extending from the second through hole. A second flexible ring 43 is provided around the outer periphery of the second push rod 40, abutting against the inner wall of the second inner cavity 23. The first flexible ring 33 increases the friction between the first push rod 30 and the inner wall of the first inner cavity 23, thereby providing a certain holding force for the first push rod 30, allowing it to remain in its current position. The second flexible ring 43 also increases the friction between the second push rod 40 and the inner wall of the second inner cavity 23, thus providing a certain holding force for the second push rod 40, allowing it to remain in its current position.

[0075] In this embodiment, the outer circumferential surface of the first push rod 30 is provided with a first annular groove, and the first flexible ring 33 is disposed in the first annular groove. The outer circumferential surface of the second push rod 40 is provided with a second annular groove, and the second flexible ring 43 is disposed in the second annular groove. Both the first flexible ring 33 and the second flexible ring 43 are rubber rings or silicone rings.

[0076] The first flexible ring 33 can be one or more, for example, four. When there are multiple first flexible rings 33, they are spaced apart along the length direction of the first push rod 30. The second flexible ring 43 can be one or more, for example, four. When there are multiple second flexible rings 43, they are spaced apart along the length direction of the second push rod 40. The number of first annular grooves corresponds to the number of first flexible rings 33, and the number of second annular grooves corresponds to the number of second flexible rings 43. Understandably, the number of first flexible rings 33 and second flexible rings 43 can be set according to actual conditions.

[0077] Both the first gear structure 52 and the second gear structure 62 include a motor gear 521, a first double gear 522, a second double gear 523, a third double gear 524, and a drive gear 525, all disposed within the gearbox 80. The motor gear 521 of the first gear structure 52 is fitted around the output end of the first drive motor 51, and the motor gear 521 of the second gear structure 62 is fitted around the output end of the second drive motor 61. The large gear of the first double gear 522 meshes with the motor gear 521, the small gear of the first double gear 522 meshes with the large gear of the second double gear 523, the small gear of the second double gear 523 meshes with the large gear of the third double gear 524, and the drive gear 525 meshes with the large gear of the third double gear 524. The drive gear 525 of the first gear structure 52 is fitted around the outer periphery of the first lead screw 531, and the drive gear 525 of the second gear structure 62 is fitted around the outer periphery of the second lead screw 631.

[0078] One end of the gear shaft 5221 of the first double gear 522 is rotatably disposed in a first shaft hole at the top of the gearbox 80, and the other end of the gear shaft 5221 is rotatably disposed in a second shaft hole at the bottom of the gearbox 80. One end of the gear shaft 5231 of the second double gear 523 is rotatably disposed in a third shaft hole at the top of the gearbox 80, and the other end of the gear shaft 5231 is rotatably disposed in a fourth shaft hole at the bottom of the gearbox 80. One end of the gear shaft 5241 of the third double gear 524 is rotatably disposed in a fifth shaft hole at the top of the gearbox 80, and the other end of the gear shaft 5241 is rotatably disposed in a sixth shaft hole at the bottom of the gearbox 80.

[0079] The first drive motor 51 drives the motor gear 521 of the first gear structure 52 to rotate, thereby driving the first double gear 522 of the first gear structure 52 to rotate, which in turn drives the second double gear 523 of the first gear structure 52 to rotate. The rotation of the second double gear 523 of the first gear structure 52 drives the third double gear 524 of the first gear structure 52 to rotate, which in turn drives the drive gear 525 of the first gear structure 52 to rotate, and thus drives the first lead screw 531 to rotate. The second drive motor 61 drives the motor gear 521 of the second gear structure 62 to rotate, thereby driving the first double gear 522 of the second gear structure 62 to rotate, which in turn drives the second double gear 523 of the second gear structure 62 to rotate. The rotation of the second double gear 523 of the second gear structure 62 drives the third double gear 524 of the second gear structure 62 to rotate, which in turn drives the drive gear 525 of the second gear structure 62 to rotate, and thus drives the second lead screw 631 to rotate. The motor gear 521, the first double gear 522, the second double gear 523, the third double gear 524 and the drive gear 525 form a multi-stage gear transmission, which can achieve greater power and a higher transmission ratio, and has high efficiency.

[0080] Furthermore, both the first gear structure 52 and the second gear structure 62 include a first signal gear 526 and a second signal gear 527. The first signal gear 526 is a double gear and is disposed within the gearbox 80. The larger gear of the first signal gear 526 meshes with the smaller gear of the third double gear 524. The end of the gearbox 80 furthest from the support frame 20 is provided with a mounting groove 81 corresponding to the second signal gear 527, such as... Figure 15 As shown, the mounting slot 81 communicates with the interior of the gearbox 80. The second signal gear 527 is located in the mounting slot 81 and meshes with the pinion of the first signal gear 526. The second signal gear 527 is equipped with a magnet 5272, which is located in the opening at the top of the mounting housing 90 and faces the magnetic encoder on the control board 70. The magnetic encoder is an absolute magnetic encoder. The rotation of the third double gear 524 can drive the first signal gear 526 to rotate, which in turn drives the second signal gear 527 to rotate, and in turn drives the magnet 5272 to rotate. The magnetic encoder and the magnet 5272 can form a magnetic field. After the magnet 5272 rotates to a predetermined position, the magnetic encoder can obtain an angle value by detecting the change in magnetic field strength. After the angle value is output to the control board 70, the control board 70 compares the angle value with the predetermined maximum angle value and minimum angle value to obtain the rotation angle of the central control screen 10. This enables monitoring of the rotation angle of the central control screen 10 and improves the user experience.

[0081] One end of the gear shaft 5261 of the first signal gear 526 is rotatably disposed in the seventh shaft hole at the top of the gearbox 80, and the other end of the gear shaft 5261 is rotatably disposed in the eighth shaft hole at the bottom of the gearbox 80. One end of the gear shaft 5271 of the second signal gear 527 is rotatably disposed in the ninth shaft hole at the bottom of the mounting groove 81. The other ends of the gear shaft 5271 of the second signal gear 527 of the first gear structure 52 and the second signal gear 527 of the second gear structure 62 are respectively rotatably disposed in the two tenth shaft holes of the gear mounting plate 528. The gear mounting plate 528 is disposed at the end of the gearbox 80 away from the support frame 20 by fasteners such as screws, and the gear mounting plate 528 is located in the opening at the top of the mounting housing 90. The gear mounting plate 528 can provide support for the second signal gear 527 of the first gear structure 52 and the second signal gear 527 of the second gear structure 62. Magnet 5272 is located at the other end of gear shaft 5271 of second signal gear 527.

[0082] This embodiment Figure 6 , Figure 10 , Figure 11 , Figure 13 , Figure 14 , Figure 15 The center position displays the teeth of motor gear 521, first double gear 522, second double gear 523, third double gear 524, drive gear 525, first signal gear 526, and second signal gear 527.

[0083] Second Embodiment

[0084] Please refer to Figures 16 to 19 The parts that are the same as in the first embodiment will not be described again. The difference between this embodiment and the first embodiment is that the support structure 21 includes a support member 213 and a support ball joint. One end of the support member 213 is hinged to one end of the support frame 20 through a third support hinge shaft. The support member 213 can rotate up and down relative to the support frame 20. The other end of the support member 213 is omnidirectionally connected to the back of the central control screen 10 through the support ball joint. The first connection structure 31 includes a first connector 311 and a first push rod ball joint. One end of the first connector 311 is omnidirectionally connected to one end of the first push rod 30 through the first push rod ball joint. The other end of the first connector 311 is hinged to the back of the central control screen 10 through the first connection hinge shaft. The central control screen 10 can rotate left and right relative to the first connector 311. The second connection structure 41 includes a second connector 411 and a second push rod ball joint. One end of the second connector 411 is rotatably connected to one end of the second push rod 40 via the second push rod ball joint. The other end of the second connector 411 is hinged to the back of the central control screen 10 via the second connection hinge shaft. The central control screen 10 can rotate left and right relative to the second connector 411.

[0085] In this embodiment, one end of the support frame 20 is provided with a support hinge portion 26 consisting of two hinge plates spaced apart to the left and right. One end of the support member 213 is hinged to the support hinge portion 26 via a third support hinge shaft. The back of the central control screen 10 is provided with a connecting seat 11, and a base 15 is provided on the connecting seat 11. The support ball joint includes a support ball head 2141 and a support ball head seat 2142. The end of the base 15 away from the connecting seat 11 is provided with a base groove. The support ball head 2141 is accommodated in the base groove, and the support ball head seat 2142 is fixed in the base groove and surrounds the support ball head 2141. The support ball head 2141 can rotate omnidirectionally relative to the support ball head seat 2142. The other end of the support member 213 is connected to the support ball head 2141. The base 15 provides mounting support for the support ball head seat 2142.

[0086] The structures of the first pusher ball joint and the second pusher ball joint are the same as those in the first embodiment, and will not be described again here. The connecting seat 11 is provided with a first hinge seat 16 and a second hinge seat 17. The other end of the first connecting member 311 is hinged to the first hinge seat 16 through a first connecting hinge shaft, and the other end of the second connecting member 411 is hinged to the second hinge seat 17 through a second connecting hinge shaft.

[0087] When it is necessary to adjust the left and right angles of the central control screen 10, the first drive assembly 50 drives the first push rod 30 to move forward and the second drive assembly 60 drives the second push rod 40 to move backward, or the first drive assembly 50 drives the first push rod 30 to move backward and the second drive assembly 60 drives the second push rod 40 to move forward. Thus, the first connecting structure 31 and the second connecting structure 41 can drive the central control screen 10 to rotate to the right or left relative to the support structure 21 and the support frame 20, thereby achieving the adjustment of the left and right angles of the central control screen 10.

[0088] When it is necessary to adjust the vertical angle of the central control screen 10, the first drive assembly 50 drives the first push rod 30 to move forward and the second drive assembly 60 drives the second push rod 40 to move forward, or the first drive assembly 50 drives the first push rod 30 to move backward and the second drive assembly 60 drives the second push rod 40 to move backward. Thus, the first connecting structure 31 and the second connecting structure 41 can drive the central control screen 10 to rotate upward or downward relative to the support structure 21 and the support frame 20, thereby realizing the adjustment of the vertical angle of the central control screen 10.

[0089] This embodiment can achieve the same technical effect as the first embodiment.

[0090] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A multi-degree-of-freedom motion mechanism for a central control screen, comprising a central control screen, characterized in that, Also includes: A support frame, located behind the central control screen; A first push rod is disposed within the support frame and one end of the first push rod extends out from one end of the support frame; The second push rod is disposed inside the support frame and one end of the second push rod extends from one end of the support frame. The first push rod and the second push rod are arranged at left and right intervals. A first drive assembly is used to drive the first push rod to move back and forth. A second drive assembly is used to drive the second push rod to move back and forth. A support structure is located above the first push rod and the second push rod. One end of the support structure is disposed at one end of the support frame, and the other end of the support structure is connected to the back of the central control screen. The central control screen can rotate left and right and up and down relative to the support frame through the support structure. Alternatively, one end of the support structure is hinged to one end of the support frame, and the other end of the support structure is omnidirectionally connected to the back of the central control screen, allowing the support structure to rotate up and down relative to the support frame. The first connecting structure has one end rotatably connected to one end of the first push rod, and the other end rotatably connected to the back of the central control screen. Alternatively, the other end of the first connecting structure is hinged to the back of the central control screen, and the central control screen can rotate left and right relative to the first connecting structure. The second connecting structure has one end rotatably connected to one end of the second push rod, and the other end rotatably connected to the back of the central control screen. Alternatively, the other end of the second connecting structure is hinged to the back of the central control screen, and the central control screen can rotate left and right relative to the second connecting structure.

2. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 1, characterized in that, The support structure includes a first hinge component and a second hinge component. One end of the first hinge component is disposed at one end of the support frame, and the first hinge component and the support frame are fixed relative to each other. The other end of the first hinge component is hinged to one end of the second hinge component through a first support hinge shaft. The second hinge component can rotate left and right relative to the first hinge component. The other end of the second hinge component is hinged to the back of the central control screen through a second support hinge shaft. The central control screen can rotate up and down relative to the second hinge component.

3. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 2, characterized in that, The first connection structure includes a first connector, a first push rod ball joint, and a first connecting ball joint. One end of the first connector is rotatably connected to one end of the first push rod via the first push rod ball joint, and the other end of the first connector is rotatably connected to the back of the central control screen via the first connecting ball joint.

4. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 2, characterized in that, The second connection structure includes a second connector, a second push rod ball joint, and a second connecting ball joint. One end of the second connector is rotatably connected to one end of the second push rod via the second push rod ball joint, and the other end of the second connector is rotatably connected to the back of the central control screen via the second connecting ball joint.

5. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 1, characterized in that, The support structure includes a support member and a support ball joint. One end of the support member is hinged to one end of the support frame via a third support hinge shaft. The support member can rotate up and down relative to the support frame. The other end of the support member is omnidirectionally connected to the back of the central control screen via the support ball joint.

6. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 5, characterized in that, The first connection structure includes a first connector and a first push rod ball joint. One end of the first connector is omnidirectionally connected to one end of the first push rod via the first push rod ball joint. The other end of the first connector is hinged to the back of the central control screen via a first connecting hinge shaft. The central control screen can rotate left and right relative to the first connector.

7. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 5, characterized in that, The second connection structure includes a second connector and a second push rod ball joint. One end of the second connector is rotatably connected to one end of the second push rod via the second push rod ball joint. The other end of the second connector is hinged to the back of the central control screen via a second connecting hinge shaft. The central control screen can rotate left and right relative to the second connector.

8. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 1, characterized in that, The multi-degree-of-freedom motion mechanism of the central control screen also includes a control board, and the first drive component and the second drive component are both electrically connected to the control board.

9. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 8, characterized in that, The first drive assembly includes a first drive motor, a first gear structure, and a first lead screw structure. The first drive motor is disposed within the support frame and electrically connected to the control board. A gearbox is provided at the other end of the support frame. The output end of the first drive motor extends into the gearbox and is connected to the first gear structure. The first lead screw structure includes a first lead screw and a first nut. The first lead screw passes through the gearbox and is rotatably connected to the gearbox. One end of the first lead screw is located outside the gearbox, and the other end extends into the support frame. The first lead screw is connected to the first gear structure. A first push rod is arranged around the outer periphery of the first lead screw. The first nut is threadedly engaged with the first lead screw and fixedly sleeved within the first push rod. The first drive motor is used to drive the first lead screw to rotate through the first gear structure, thereby driving the first nut to move back and forth, and further driving the first push rod to move back and forth.

10. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 9, characterized in that, The second drive assembly includes a second drive motor, a second gear structure, and a second lead screw structure. The second drive motor is disposed within the support frame and electrically connected to the control board. The output end of the second drive motor extends into the gearbox and is connected to the second gear structure. The second lead screw structure includes a second lead screw and a second nut. The second lead screw passes through the gearbox and is rotatably connected to the gearbox. One end of the second lead screw is located outside the gearbox, and the other end extends into the support frame. The second lead screw is connected to the second gear structure. A second push rod is arranged around the outer circumference of the second lead screw. The second nut is threadedly engaged with the second lead screw and fixedly sleeved within the second push rod. The second drive motor drives the second lead screw to rotate through the second gear structure, thereby driving the second nut to move back and forth, and further driving the second push rod to move back and forth.

11. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 10, characterized in that, The gearbox body has a mounting shell at the end away from the support frame. The end of the mounting shell near the gearbox body is open. The control board is disposed inside the mounting shell. One end of the first lead screw and one end of the second lead screw both pass through the opening of the mounting shell and are located inside the mounting shell.

12. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 11, characterized in that, Both the first gear structure and the second gear structure include a motor gear, a first double gear, a second double gear, a third double gear, and a drive gear disposed within the gearbox body. The motor gear of the first gear structure is sleeved on the outer periphery of the output end of the first drive motor, and the motor gear of the second gear structure is sleeved on the outer periphery of the output end of the second drive motor. The large gear of the first double gear meshes with the motor gear, the small gear of the first double gear meshes with the large gear of the second double gear, the small gear of the second double gear meshes with the large gear of the third double gear, and the drive gear meshes with the large gear of the third double gear. The drive gear of the first gear structure is sleeved on the outer periphery of the first lead screw, and the drive gear of the second gear structure is sleeved on the outer periphery of the second lead screw.

13. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 12, characterized in that, Both the first gear structure and the second gear structure include a first signal gear and a second signal gear. The first signal gear is a double gear and is disposed in the gearbox. The large gear of the first signal gear meshes with the small gear of the third double gear. The end of the gearbox away from the support frame is provided with a mounting groove corresponding to the second signal gear. The mounting groove communicates with the interior of the gearbox. The second signal gear is disposed in the mounting groove and meshes with the small gear of the first signal gear. The second signal gear is provided with a magnet. The magnet is located in the opening at the top of the mounting shell and is opposite to the magnetic encoder on the control board.

14. The multi-degree-of-freedom motion mechanism for the central control screen according to claim 10, characterized in that, The support frame has a first inner cavity and a second inner cavity, which are spaced apart from each other on the left and right. One end of the support frame has a first through hole communicating with the first inner cavity and a second through hole communicating with the second inner cavity. The other end of the support frame has a third through hole communicating with the first inner cavity and a fourth through hole communicating with the second inner cavity. The other end of the first lead screw extends into the first inner cavity through the third through hole, and the other end of the second lead screw extends into the second inner cavity through the fourth through hole. The first push rod is disposed in the first inner cavity, and one end of the first push rod extends out from the first through hole. A first flexible ring is provided on the outer periphery of the first push rod, and the first flexible ring abuts against the inner wall of the first inner cavity. The second push rod is disposed in the second inner cavity, and one end of the second push rod extends out from the second through hole. A second flexible ring is provided on the outer periphery of the second push rod, and the second flexible ring abuts against the inner wall of the second inner cavity.

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