Differential lead screw rigid-flexible coupling electric telescopic rod and application thereof

Abstract

The invention relates to the technical field of telescopic rods, in particular to a differential screw rigid-flexible coupling electric telescopic rod and application thereof. In order to solve the problems that an existing posture adjusting platform is complex in control, rod piece stretching and retracting control depends on material heating, heat influences are generated on other structures, and the stability and accuracy of a system are interfered, the following technical scheme is provided: the posture adjusting platform comprises a mounting seat which is arranged in a square shape; the driving mechanism is mounted in the mounting seat; the two sets of synchronous plates are arranged on the two sides of the mounting base correspondingly, and a moving frame is jointly mounted on the two sets of synchronous plates; the positioning plate is arranged on one side of the mounting seat; and the adjusting assembly is connected with the synchronous plate and the positioning plate and is used for finely adjusting the distance between the synchronous plate and the positioning plate. According to the invention, high-precision adjustment of the attitude is realized, the control difficulty is simplified, the stability and accuracy of system operation are improved, and the application range of related technologies in practical engineering is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of telescopic rods, and in particular to a differential screw rigid-flexible coupling electric telescopic rod and applications thereof. Background Art

[0002] In many engineering fields today, achieving high-precision posture adjustment has always been a critical and challenging task. The prior art (patent number: 202311041983.9) proposes a coarse-fine two-stage drive six-degree-of-freedom parallel adjustment platform. This solution is innovative in that it improves the accuracy of the six-degree-of-freedom parallel mechanism to a certain extent by adding a lower-level flexible hinge fine adjustment mechanism.

[0003] However, after an in-depth analysis of the topological relationship of the scheme, it is not difficult to find that the lower mechanism is installed in an inclined manner, thereby forming a 12-degree-of-freedom platform, which undoubtedly greatly increases the complexity and difficulty of control. In addition, the expansion and contraction of the platform rod is controlled by heating the positive and negative expansion materials. This control method will inevitably have a thermal impact on other structures, which may interfere with the stability and accuracy of the entire system, bringing many limitations to practical applications. In view of this, the present invention proposes a differential screw rigid-flexible coupling electric telescopic rod and its application. Summary of the invention

[0004] The purpose of the present invention is to propose a differential screw rigid-flexible coupling electric telescopic rod and its application in view of the problems in the background technology that the existing attitude adjustment platform is complex to control and the extension and retraction of the rod is controlled by material heating, which will have thermal effects on other structures and interfere with the stability and accuracy of the system.

[0005] On the one hand, the present invention proposes a differential screw rigid-flexibly coupled electric telescopic rod, comprising a mounting seat with a hollow structure, the mounting seat being arranged in a "mouth" shape; a driving mechanism installed in the mounting seat; two groups of synchronization plates, the two groups of synchronization plates being respectively arranged on the upper and lower sides of the mounting seat, and a moving frame being commonly installed on the two groups of synchronization plates; a positioning plate arranged on one side of the mounting seat; an adjustment component connected to the synchronization plate and the positioning plate, the adjustment component being used to fine-tune the distance between the synchronization plate and the positioning plate, the moving end of the driving mechanism being connected to the positioning plate, and the driving mechanism being used to drive the synchronization plate and the positioning plate to move synchronously.

[0006] Optionally, the synchronization plate includes a mounting frame, a plurality of first flexible sheets are fixedly connected to the inner side of the mounting frame, the mounting frame is connected to a mounting platform via the first flexible sheets, second flexible sheets are arranged on both sides of the mounting platform, a first pressure block is arranged on the side of the second flexible sheet away from the mounting platform, the first pressure block is fixed to the mounting platform via bolts, a second pressure block is also arranged on the side of the second flexible sheet close to the mounting platform, the second pressure block is fixed to the mounting frame via bolts.

[0007] Optionally, first sliders are installed on both the installation frame and the positioning plate close to the installation seat side. A first slide rail is slidably connected among multiple groups of the first sliders on the same side, and multiple groups of the first slide rails are fixedly connected to the installation seat.

[0008] Optionally, the driving mechanism includes a fixing plate fixedly connected to the inner side of the installation seat. A first servo motor is installed on one side of the fixing plate. The output end of the first servo motor is fixedly connected to a first threaded rod. The first threaded rod is rotatably connected to the inner side of the installation seat. A first threaded sleeve is threadedly connected to the first threaded rod. A moving block is fixedly connected to the first threaded sleeve. The moving block is fixedly connected to the positioning plate.

[0009] Optionally, the adjustment assembly includes a second threaded sleeve installed in the moving block. A second threaded rod is threadedly connected to the second threaded sleeve. A third threaded sleeve is threadedly connected to the second threaded rod. A synchronization block is fixedly connected to the third threaded sleeve. The synchronization block is fixedly connected between two installation platforms. The adjustment assembly further includes a second servo motor. An installation plate is arranged outside the second servo motor. The second servo motor is installed on the installation plate. The output end of the second servo motor penetrates through the installation plate and is fixedly connected to the second threaded rod. The installation plate is connected to the bottom of the positioning plate.

[0010] Optionally, a matching mechanism is arranged between the installation plate and the moving frame. The installation plate and the moving frame are connected through the matching mechanism. The matching mechanism includes a second slide rail fixedly connected to the top of the installation plate. A second slider is slidably connected to the second slide rail. The second slider is fixedly connected to the moving frame.

[0011] Optionally, the internal thread pitch of the second threaded sleeve is greater than the internal thread pitch of the third threaded sleeve, and the thread pitches at both ends of the second threaded rod are different.

[0012] Optionally, the moving frame is arranged in a "U" shape. A second fixing seat is installed on the side of the moving frame away from the installation seat. One end of the installation seat away from the second fixing seat is fixedly connected to a first fixing seat.

[0013] On the other hand, the present invention proposes a posture rough and fine composite adjustment platform, including two adjustment plates, and more than six groups of the differential screw rigid-flexible coupling electric telescopic rods are arranged between the two adjustment plates.

[0014] Optionally, the ends of the first fixed seat and the second fixed seat away from each other are connected to a connecting assembly, the differential screw rigid-flexibly coupled electric telescopic rod is fixedly connected to the adjustment plate via the connecting assembly, the connecting assembly includes a first connecting seat fixedly connected to the first fixed seat or the second fixed seat, a transition block is rotatably connected to the first connecting seat, the transition block is rotatably connected to the second connecting seat, and the second connecting seat is fixedly connected to the adjustment plate.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] The present invention realizes the coarse adjustment and fine adjustment of the length of the telescopic rod through the unique design of the driving mechanism and the adjustment component. The first servo motor drives the first threaded rod to rotate, and the approximate length adjustment can be performed. The adjustment component driven by the second servo motor can make a slight adjustment to the position of the mounting platform by utilizing the difference in thread pitch, thereby improving the positioning accuracy. At the same time, the cooperation between the first slider and the first slide rail, the second slide rail and the second slider, and the buffering of the friction force by the first flexible sheet and the second flexible sheet ensure the stable movement of each component, greatly improve the stability and reliability of the overall operation, and reduce shaking and deviation.

[0017] Furthermore, the angle deviation caused by length adjustment can be adapted through the equipped connection components. In the attitude coarse-fine compound adjustment platform, the position and attitude of the adjustment plate can be flexibly adjusted by adjusting the length of the telescopic rod. In addition, the driving mechanism can also use a linear motor to achieve long-stroke movement, which expands the scope of use. Whether in work scenarios with extremely high precision requirements or in long-stroke working environments, it can play a good role and has broad application prospects.

[0018] In summary, the present invention is conducive to achieving high-precision adjustment of posture, simplifying the control difficulty, improving the stability and accuracy of system operation, and expanding the application scope of related technologies in practical engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a differential screw rigid-flexible coupling electric telescopic rod;

[0020] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of;

[0021] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0022] Figure 4 It is a structural diagram of a posture coarse and fine compound adjustment platform.

[0023] Reference numerals:

[0024] 1. Mounting seat; 11. First fixing seat; 12. First sliding block; 13. First sliding rail;

[0025] 2. driving mechanism; 21. fixing plate; 22. first servo motor; 23. first threaded rod; 24. first threaded sleeve; 25. moving block;

[0026] 3. Synchronous plate; 31. Mounting frame; 32. First flexible sheet; 33. Mounting platform; 34. Second flexible sheet; 35. First pressing block; 36. Second pressing block;

[0027] 4. Moving frame; 41. Second fixing seat;

[0028] 5. Positioning plate;

[0029] 6. Adjustment assembly; 61. Second threaded sleeve; 62. Second threaded rod; 63. Third threaded sleeve; 64. Synchronous block; 65. Second servo motor; 66. Mounting plate;

[0030] 7. Matching mechanism; 71. Second slide rail; 72. Second slide block;

[0031] 8. Connecting assembly; 81. First connecting seat; 82. Transition block; 83. Second connecting seat;

[0032] 9. Adjustment plate. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Example

[0039] like Figure 1 As shown, the differential screw rigid-flexible coupling electric telescopic rod proposed by the present invention includes a mounting seat 1, which is arranged in a "mouth" shape and is formed by welding multiple steel plates or assembling them with threads. This structural form enables the mounting seat 1 to have high structural strength and stability, and can reliably carry and fix various components installed subsequently, providing a solid foundation for the stable operation of the entire electric telescopic rod.

[0040] For further information, see Figure 2 The telescopic rod comprises a driving mechanism 2 installed in the mounting seat 1, and the moving end of the driving mechanism 2 is connected to the positioning plate 5, and the driving mechanism 2 is used to drive the synchronous plate 3 to move synchronously with the positioning plate 5. The driving mechanism 2 comprises a fixed plate 21 fixedly connected to the inner side of the mounting seat 1, and a first servo motor 22 is installed on one side of the fixed plate 21. The output end of the first servo motor 22 is fixedly connected to the first threaded rod 23, and the first servo motor 22 drives the first threaded rod 23 to rotate after starting. The first threaded rod 23 is rotatably connected to the inner side of the mounting seat 1, so that the first threaded rod 23 keeps rotating in place. The first threaded rod 23 is threadedly connected with a first threaded sleeve 24, and the first threaded sleeve 24 is fixedly connected with a moving block 25, and the moving block 25 is fixedly connected with the positioning plate 5. When the first servo motor 22 rotates, it drives the first threaded sleeve 24 to move, and drives the positioning plate 5 to move through the moving block 25. The design of the driving mechanism 2 realizes efficient transmission of power, can accurately control the movement of the positioning plate 5, and provides a stable power source for subsequent synchronous movement and overall adjustment.

[0041] The driving mechanism 2 can also adopt a linear motor. The moving end of the linear motor is connected to the positioning plate 5 to achieve long-stroke movement. The application of the linear motor enables the electric telescopic rod to operate quickly and smoothly in long-stroke working scenarios, effectively expanding its scope of use.

[0042] Furthermore, as Figure 1 and Figure 3 shown, the above-mentioned telescopic rod further includes two groups of synchronous plates 3, which are respectively arranged on both sides of the mounting seat 1. The synchronous plate 3 includes a mounting frame 31, and a plurality of groups of first flexible sheets 32 are fixedly connected to the inner side of the mounting frame 31. The mounting frame 31 is connected to a mounting table 33 through the first flexible sheets 32. The mounting table 33 is connected to the mounting frame 31 through the first flexible sheets 32 to eliminate the influence brought by the friction between the first slider 12 and the first slide rail 13. The setting of the first flexible sheets 32 effectively buffers the vibration and displacement deviation generated by the friction, greatly improving the smoothness and accuracy of the movement of the mounting table 33. Second flexible sheets 34 are arranged on both sides of the mounting table 33. A first pressing block 35 is arranged on the side of the second flexible sheet 34 away from the mounting table 33. The first pressing block 35 is fixed to the mounting table 33 by bolts. A second pressing block 36 is also arranged on the side of the second flexible sheet 34 close to the mounting table 33. The second pressing block 36 is fixed to the mounting frame 31 by bolts. The setting of the first pressing block 35 and the second pressing block 36 makes the second flexible sheet 34 firmly fixed to the mounting frame 31 and the mounting table 33. The connection stability between the mounting table 33 and the mounting frame 31 is further improved through the second flexible sheets 34, and at the same time, the influence of friction is eliminated. The second flexible sheets 34 further enhance the anti-interference ability of the overall structure, ensuring that the mounting table 33 can still work stably under complex working conditions.

[0043] A moving frame 4 is commonly installed on the two groups of synchronous plates 3. The moving frame 4 is arranged in a "U" shape. A second fixed seat 41 is installed on the side of the moving frame 4 away from the mounting seat 1. One end of the mounting seat 1 away from the second fixed seat 41 is fixedly connected to a first fixed seat 11. The settings of the moving frame 4, the first fixed seat 11, and the second fixed seat 41 provide connection and installation interfaces for the entire electric telescopic rod, facilitating combination and application with other devices.

[0044] Specifically, the above-mentioned telescopic rod includes a positioning plate 5 arranged on one side of the mounting seat 1. The positioning plate 5 is arranged on the side of the synchronous plate 3 close to the fixed plate 21. The positioning plate 5 plays a key role in positioning and connection, ensuring the relative position accuracy between components and the coordinated operation of the entire system.

[0045] Specifically, the first slider 12 is installed on the side of the installation frame 31 and the positioning plate 5 close to the installation seat 1, and the first slide rail 13 is slidably connected to the multiple groups of first sliders 12 on the same side, and the multiple groups of first slide rails 13 are fixedly connected to the installation seat 1. The installation frame 31, the positioning plate 5 and the moving frame 4 are stably moved by the arrangement of the first slider 12 and the first slide rail 13. The cooperation of the first slider 12 and the first slide rail 13 effectively constrains the movement trajectory of the components, improves the stability and reliability of the movement, and reduces shaking and deviation.

[0046] Furthermore, the telescopic rod further comprises an adjustment assembly 6 connected to the synchronous plate 3 and the positioning plate 5, and the adjustment assembly 6 is used to fine-tune the distance between the synchronous plate 3 and the positioning plate 5. The adjustment assembly 6 comprises a second threaded sleeve 61 installed in the moving block 25, and the position of the second threaded sleeve 61 remains fixed after the first servo motor 22 stops. A second threaded rod 62 is threadedly connected in the second threaded sleeve 61, and the second threaded rod 62 moves along its own length direction when rotating. A third threaded sleeve 63 is threadedly connected to the second threaded rod 62, and the second threaded rod 62 drives the third threaded sleeve 63 to move along its length direction when rotating. A synchronization block 64 is fixedly connected to the third threaded sleeve 63, and the synchronization block 64 is fixedly connected between the two groups of mounting platforms 33. When the third threaded sleeve 63 moves, it drives the two groups of mounting platforms 33 to move through the synchronization block 64. The adjustment assembly 6 also includes a second servo motor 65, a mounting plate 66 is provided outside the second servo motor 65, the second servo motor 65 is installed on the mounting plate 66, the output end of the second servo motor 65 passes through the mounting plate 66 and is fixedly connected to the second threaded rod 62 through a coupling, the mounting plate 66 is connected to the bottom of the positioning plate 5, and the second servo motor 65 drives the second threaded rod 62 to rotate after starting. When the second threaded rod 62 rotates, its moving direction is opposite to the moving direction of the third threaded sleeve 63. Since the internal thread pitch of the second threaded sleeve 61 is greater than the internal thread pitch of the third threaded sleeve 63, the thread pitches at both ends of the second threaded rod 62 are different, and the moving distance of the third threaded sleeve 63 is less than the moving distance of the second threaded rod 62, thereby reducing the displacement of the third threaded sleeve 63 and improving the accuracy of positioning the mounting platform 33. This unique design of the adjustment assembly 6 realizes high-precision fine-tuning of the position of the mounting platform 33, and meets the use requirements in some work scenarios with extremely high precision requirements.

[0047] A matching mechanism 7 is provided between the mounting plate 66 and the positioning plate 5, and the matching mechanism 7 includes a second slide rail 71 fixedly connected to the top of the mounting plate 66, a second slider 72 is slidably connected to the second slide rail 71, and the second slider 72 is fixedly connected to the positioning plate 5. The second slide rail 71 and the second slider 72 are provided to enable the mounting plate 66 to slide on the bottom of the positioning plate 5. The matching mechanism 7 further optimizes the coordinated movement between the components, reduces the friction and interference between the components, and improves the overall operation efficiency.

[0048] See also Figure 4 This embodiment is applied to a posture coarse and fine composite adjustment platform, including two groups of adjustment plates 9, and six groups of the above-mentioned differential screw rigid-flexible coupling electric telescopic rods are arranged between the two groups of adjustment plates 9. The ends of the first fixed seat 11 and the second fixed seat 41 that are away from each other are connected to a connecting component 8, and the differential screw rigid-flexible coupling electric telescopic rod is fixedly connected to the adjustment plate 9 through the connecting component 8. The connecting component 8 includes a first connecting seat 81 fixedly connected to the first fixed seat 11 or the second fixed seat 41, and a transition block 82 is rotatably connected to the first connecting seat 81, and a second connecting seat 83 is rotatably connected to the transition block 82. The second connecting seat 83 is fixedly connected to the adjustment plate 9. Through the setting of the connecting component 8, the angle deviation caused by the adjustment of the length of the above-mentioned differential screw rigid-flexible coupling electric telescopic rod is adapted. After one group of adjustment plates 9 is fixed, the position and posture of the other group of adjustment plates 9 are adjusted by adjusting the length of the above-mentioned differential screw rigid-flexible coupling electric telescopic rod. The design of the connecting component 8 enables the electric telescopic rod to flexibly adapt to angle changes during the adjustment process, thereby ensuring the stability and reliability of the entire adjustment platform.

[0049] In this embodiment, when adjusting the posture of a movable set of adjustment plates 9, firstly, when adjusting the approximate length of the telescopic rod, the first servo motor 22 is started to drive the first threaded rod 23 to rotate, and the first threaded rod 23 drives the first threaded sleeve 24 to move when rotating, and the first threaded sleeve 24 drives the positioning plate 5 to move through the moving block 25, and the positioning plate 5 moves smoothly under the limiting action of the first slider 12 and the first slide rail 13. At this time, since the synchronous plate 3 and the positioning plate 5 are connected together through the adjustment component 6, the synchronous plate 3 moves synchronously when the positioning plate 5 moves, thereby driving the moving frame 4 to move, adjusting the distance between the first fixed seat 11 and the second fixed seat 41, and adjusting the length of the telescopic rod. When fine-tuning the length of the telescopic rod, the second servo motor 65 is started, and the second servo motor 65 drives the second threaded rod 62 to rotate. When the second threaded rod 62 rotates, since the position of the second threaded sleeve 61 is fixed, the second threaded rod 62 moves along its own length direction, and drives the third threaded sleeve 63 to move at the same time. The second threaded rod 62 moves while driving the second servo motor 65 and the mounting plate 66 to move. The mounting plate 66 slides under the moving frame 4 due to the arrangement of the second slide rail 71 and the second slider 72. At the same time, when the second threaded rod 62 rotates, the third threaded sleeve 63 is also driven to move, and the moving direction of the third threaded sleeve 63 is opposite to the moving direction of the second threaded rod 62. Since the internal thread pitch of the second threaded sleeve 61 is greater than the internal thread pitch of the third threaded sleeve 63, the displacement of the third threaded sleeve 63 when the second threaded rod 62 rotates one circle is small, which is convenient for making slight adjustments to the position of the mounting platform 33, so that the positioning of the mounting platform 33 is accurate, and the accuracy of adjusting the length of the telescopic rod is improved. At the same time, through the arrangement of the first flexible sheet 32 ​​and the second flexible sheet 34, the friction between the first slider 12 and the first slide rail 13 can be effectively prevented from affecting the mounting platform 33.

[0050] The above specific embodiment is only an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.

Claims

1. A differential screw rigid-flexible coupling electric telescopic rod, characterized in that: include: A mounting seat (1) with a hollow structure; A driving mechanism (2) installed in the mounting seat (1); Two groups of synchronization plates (3), the two groups of synchronization plates (3) are respectively arranged on the upper and lower sides of the mounting seat (1), and a moving frame (4) is commonly installed on the two groups of synchronization plates (3); A positioning plate (5) arranged on one side of the mounting seat (1); An adjustment component (6) connected to the synchronization plate (3) and the positioning plate (5), the adjustment component (6) being used to fine-tune the distance between the synchronization plate (3) and the positioning plate (5), the moving end of the driving mechanism (2) being connected to the positioning plate (5), the driving mechanism (2) being used to drive the synchronization plate (3) and the positioning plate (5) to move synchronously.

2. The differential screw rigid-flexible coupling electric telescopic rod according to claim 1, characterized in that: The synchronization plate (3) comprises a mounting frame (31), a plurality of first flexible sheets (32) are fixedly connected to the inner side of the mounting frame (31), the mounting frame (31) is connected to a mounting platform (33) via the first flexible sheets (32), second flexible sheets (34) are arranged on both sides of the mounting platform (33), a first pressing block (35) is arranged on the side of the second flexible sheet (34) away from the mounting platform (33), the first pressing block (35) is fixed to the mounting platform (33) by bolts, and a second pressing block (36) is also arranged on the side of the second flexible sheet (34) close to the mounting platform (33), the second pressing block (36) is fixed to the mounting frame (31) by bolts.

3. The differential screw rigid-flexible coupling electric telescopic rod according to claim 2, characterized in that: The installation frame (31) and the positioning plate (5) are both installed with a first sliding block (12) on one side close to the installation seat (1); multiple groups of the first sliding blocks (12) on the same side are slidably connected to a first sliding rail (13); and the multiple groups of the first sliding rails (13) are fixedly connected to the installation seat (1).

4. The differential screw rigid-flexible coupling electric telescopic rod according to claim 3, characterized in that: The driving mechanism (2) comprises a fixing plate (21) fixedly connected to the inner side of the mounting seat (1); a first servo motor (22) is installed on one side of the fixing plate (21); an output end of the first servo motor (22) is fixedly connected to a first threaded rod (23); the first threaded rod (23) is rotatably connected to the inner side of the mounting seat (1); a first threaded sleeve (24) is threadedly connected to the first threaded rod (23); a moving block (25) is fixedly connected to the first threaded sleeve (24); and the moving block (25) is fixedly connected to the positioning plate (5).

5. The differential screw rigid-flexible coupling electric telescopic rod according to claim 4, characterized in that: The adjustment assembly (6) includes a second threaded sleeve (61) installed in the moving block (25). A second threaded rod (62) is threadedly connected in the second threaded sleeve (61). A third threaded sleeve (63) is threadedly connected to the second threaded rod (62). A synchronization block (64) is fixedly connected to the third threaded sleeve (63). The synchronization block (64) is fixedly connected between two mounting platforms (33). The adjustment assembly (6) further includes a second servo motor (65). An installation plate (66) is arranged outside the second servo motor (65). The second servo motor (65) is installed on the installation plate (66). The output end of the second servo motor (65) penetrates through the installation plate (66) and is fixedly connected to the second threaded rod (62). The installation plate (66) is connected to the bottom of the positioning plate (5).

6. The differential screw rigid-flexible coupling electric telescopic rod according to claim 5, characterized in that: A matching mechanism (7) is arranged between the installation plate (66) and the moving frame (4). The installation plate (66) and the moving frame (4) are connected through the matching mechanism (7). The matching mechanism (7) includes a second slide rail (71) fixedly connected to the top of the installation plate (66). A second slider (72) is slidably connected to the second slide rail (71). The second slider (72) is fixedly connected to the moving frame (4).

7. The differential screw rigid-flexible coupling electric telescopic rod according to claim 6, characterized in that: The internal thread pitch of the second threaded sleeve (61) is greater than the internal thread pitch of the third threaded sleeve (63). The thread pitches at both ends of the second threaded rod (62) are different.

8. The differential screw rigid-flexible coupling electric telescopic rod according to claim 7, characterized in that: The moving frame (4) is arranged in a "U" shape. A second fixed seat (41) is installed on one side of the moving frame (4) away from the mounting seat (1). One end of the mounting seat (1) away from the second fixed seat (41) is fixedly connected to a first fixed seat (11).

9. A posture coarse and fine compound adjustment platform, characterized in that: It includes two adjustment plates (9). Six differential screw rigid-flexible coupling electric telescopic rods as described in any one of claims 8 are arranged between the two adjustment plates (9).

10. The posture coarse and fine compound adjustment platform according to claim 9, characterized in that: One end of the first fixed seat (11) and the second fixed seat (41) away from each other are both connected with a connection assembly (8). The differential screw rigid-flexible coupling electric telescopic rod is fixedly connected to the adjustment plate (9) through the connection assembly (8). The connection assembly (8) includes a first connection seat (81) fixedly connected to the first fixed seat (11) or the second fixed seat (41). A transition block (82) is rotatably connected to the first connection seat (81). A second connection seat (83) is rotatably connected to the transition block (82). The second connection seat (83) is fixedly connected to the adjustment plate (9).

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