Zero-gravity seat linkage framework

Abstract

The invention relates to the field of seats, and particularly discloses a zero-gravity seat linkage framework which comprises a driving assembly, a linkage structure, a cushion structure, a leg supporting structure and a back supporting frame, the cushion structure comprises a movable base and a fixed base, and the driving assembly drives the movable base to slide on the fixed base in a limited mode; the back supporting frame is rotationally connected with the movable base through a back mounting rod, and the linkage structure can achieve overturning of the leg supporting structure and rotation of the back supporting frame in the moving process of the movable base. By arranging the linkage structure, the single driving assembly can drive the leg supporting structure to be unfolded or folded and drive the back supporting piece to be turned over, so that switching between a normal sitting posture and a zero-gravity sitting posture is achieved, the comfort is better, and due to the fact that the leg supporting structure and the back supporting piece act separately, the sitting posture is more comfortable. Therefore, the stretched leg support structure can be matched with backrests with various angles, a more flexible and personalized lying posture is further obtained, the manufacturing cost and the assembling difficulty are remarkably reduced through the overall structure, and the adaptability is high.

Description

Technical Field

[0001] The present invention relates to the field of seats, and particularly to an automobile seat frame. Background Art

[0002] Currently, with the continuous improvement of living standards, people have higher and higher requirements for the riding comfort of automobile seats. A zero-gravity posture seat can enable passengers to obtain a relatively comfortable experience within a limited area of the automobile. For the switching between the zero-gravity posture and the conventional sitting posture of existing automobile seats, one structure is completed through the respective adjustments of the seat backrest and the leg rest, which requires two sets of driving components and two adjustment operations, but can obtain a more personalized seat posture; the other is through the linkage adjustment of the seat backrest and the leg rest. Due to the linkage between the leg rest and the seat backrest, the operation is convenient and the seat structure cost is reduced. However, due to the cooperation between the extension amount of the leg rest and the angle of the seat backrest, in order to achieve the optimal extension amount of the leg rest, the seat backrest must be adjusted to the lowest angle, and the seat backrest cannot be adjusted individually.

[0003] The technical problem to be solved by this application is: how to obtain a low-cost and relatively flexible zero-gravity posture seat. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a linkage frame for a zero-gravity seat.

[0005] The technical solution adopted by the present invention is: a linkage frame for a zero-gravity seat, including a driving component, a linkage structure, a seat cushion structure, a leg rest structure, and a back support rod. The seat cushion structure includes a movable base and a fixed base. The driving component drives the movable base to slide in a limited manner on the fixed base. The back support rod is rotationally connected to the movable base through a back mounting rod. The linkage structure includes a first linkage rod, a second linkage rod, a third linkage rod, a fourth linkage rod, and a linkage fixing member. The linkage fixing member is fixedly connected to the movable base. One end of the first linkage rod is rotationally limited on the fixed base. The first linkage rod, the back mounting rod, and the third linkage rod are respectively rotationally connected to different ends of the second linkage rod. A back connecting rod is connected between the second linkage rod and the back support rod. A track groove and a track roller are provided between the third linkage rod and the linkage fixing member. The track groove includes a first track segment and a second track segment. The third linkage rod is connected to the leg rest structure through the fourth linkage rod. When the track roller moves in the first track segment, the leg rest structure is driven by the fourth linkage member to flip. When the track roller moves in the first track segment, the back support rod is driven by the second linkage member to rotate.

[0006] The driving component drives the movable base to slide in a limited manner on the fixed base. During the sliding process of the movable base, the back support rod and the leg rest structure move along with the movable base. Since different ends of the second linkage rod are respectively rotatably connected to the first linkage rod, the back mounting rod, and the third linkage rod, and the back support rod is rotatably connected to the movable base through the back mounting rod, the second linkage rod also moves along with the movable base. The first linkage rod and the third linkage rod move due to the movement of the second linkage rod. The first linkage rod pushes the second linkage rod, thereby applying a thrust force to the third linkage rod. However, since one end of the third linkage rod is restricted by the track groove, the third linkage rod moves along the track groove after receiving the thrust force. During the movement, the fourth linkage rod moves due to the thrust force from the third linkage rod, thereby driving the leg rest structure to unfold. After the leg rest structure is fully unfolded, the third linkage rod still receives the thrust force and moves in the track groove. However, due to the continuous movement of the second linkage member and the setting of the back connecting rod, the second linkage rod pulls the back support rod towards the fixed base direction, thereby driving the back support rod to rotate.

[0007] In some embodiments, the leg rest structure includes a leg rest mounting frame, a first link rod, a second link rod, a first support rod, a second support rod, and a leg rest support member. The leg rest mounting frame is fixedly connected to the movable base. One end of the first link rod is rotatably limited in the leg rest mounting frame, and the other end is rotatably connected to one end of the first support rod. One end of the second link rod is rotatably limited in the leg rest mounting frame, and the other end is rotatably connected to one end of the second support rod. The other end of the first support rod is rotatably limited in the leg rest support member, and the other end of the second support rod is rotatably limited in the leg rest support member. One end of the fourth linkage member is rotatably connected to the second link rod, and the other end is rotatably connected to the third linkage rod.

[0008] In some embodiments, the length of the first link rod is longer than the length of the second link rod, and the length of the first support rod is shorter than the length of the second support rod.

[0009] In some embodiments, the second linkage rod is shaped like a "Y" with three ends, namely Y1, Y2, and Y3. The Y1 end of the second linkage rod is the end far from the movable base, and the Y2 end and the Y3 end of the second linkage rod are both the ends close to the movable base. The Y1 end of the second linkage rod is rotatably connected to the first linkage rod, the Y2 end is rotatably connected to the back mounting rod, and the Y3 end is rotatably connected to one end of the third linkage rod.

[0010] In some embodiments, the first track segment is inclined upward, the second track segment is inclined downward, and the inclination angle of the second track segment is greater than the inclination angle of the second track segment.

[0011] In some embodiments, it includes a back support frame. One end of the back support rod is fixedly connected to the back support frame, and the other end is rotatably connected to the back mounting rod. The back mounting rod is fixedly connected to the movable base.

[0012] In some embodiments, a trajectory fixing member is fixedly provided on the third linkage rod. The trajectory fixing member is fixedly riveted to the third linkage member, and the trajectory roller rotates in a limited manner on the trajectory fixing member.

[0013] In some embodiments, a limiting chute and a limiting pulley are provided between the fixed base and the movable base. The limiting pulley rotates in a limited manner within the limiting chute, and the movable base is limited to move on the fixed base through the limiting chute and the limiting pulley.

[0014] In some embodiments, the limiting chute is provided on the fixed base. The limiting pulley is connected to the movable base through a base connecting member. The movable base is fixedly connected to the base connecting member, and the limiting pulley rotates in a limited manner at one end of the base connecting member.

[0015] In some embodiments, the driving assembly includes a driving element, a driving connection seat, and a driving track. The axial direction of the driving track is consistent with the axial direction of the limiting chute. The driving track is provided below the movable base. The driving element drives the driving connection seat to move along the driving track, and the driving moving seat is fixedly connected to the movable base.

[0016] The beneficial effects of the present invention are as follows:

[0017] Through the setting of the linkage structure, in the same movement space, the linkage structure of this zero-gravity seat linkage skeleton can drive the leg rest structure to unfold or fold, and can also drive the back support to flip, so as to realize the switching between the normal sitting position and the zero-gravity sitting position, with better comfort, and the backrest does not occupy the space at the rear of the seat. Moreover, since the leg rest structure and the back support move separately, the extended leg rest structure can cooperate with the back support at various angles, and thus a more flexible and personalized lying flat posture can be obtained. The structure of the present invention is simple, the process requirements are low, and the cost advantage is obvious. Moreover, it is realized through a single driving assembly, which significantly reduces the manufacturing cost and assembly difficulty, has strong adaptability, can match the existing automobile seat structure, and does not require large-scale modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of the structure of the overall skeleton;

[0020] Figure 3 is a schematic diagram of the structure in the normal sitting position;

[0021] Figure 4 is a schematic diagram of the structure of the linkage structure in the normal sitting position;

[0022] Figure 5 is a schematic diagram of the structure after the leg rest structure is fully extended;

[0023] Figure 6Schematic diagram of the linkage structure after the leg rest structure is fully extended;

[0024] Figure 7 Schematic diagram of the structure when the back support member is fully flipped;

[0025] Figure 8 Schematic diagram of the linkage structure when the back support member is fully flipped;

[0026] The reference numerals in the figure correspond to the names as follows: 1, drive assembly; 2, linkage structure; 3, seat cushion structure; 4, leg rest structure; 5, back support structure; 11, drive element; 12, drive connection seat; 13, drive track; 21, first linkage rod; 22, second linkage rod; 23, third linkage rod; 24, fourth linkage rod; 25, linkage fixing member; 26, track groove; 27, track roller; 28, track fixing member; 261, first track segment; 262, second track segment; 31, movable base; 32, fixed base; 33, limit chute; 34, limit pulley; 35, base connecting member; 41, leg rest mounting bracket; 42, first connecting rod; 43, second connecting rod; 44, first support rod; 45, second support rod; 46, leg rest support member; 47, leg rest support tray; 51, back support frame; 52, back support rod; 53, back mounting rod; 54, back connecting rod. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1 - Figure 2 , the present invention provides a technical solution: a zero-gravity seat linkage skeleton, including a drive assembly 1, a linkage structure 2, a seat cushion structure 3, a leg rest structure 4, and a back support structure 5. The back support structure 5 rotates on the seat cushion structure 3.

[0029] Please refer to Figure 1 - Figure 2, the seat cushion structure 3 includes a movable base 31 and a fixed base 32, and the movable base 31 is limited to slide on the fixed base 32. The length direction of the movable base 31 is always parallel to that of the fixed base 32. The movable base 31 slides above the fixed base 32, and a limit chute 33 and a limit pulley 34 are provided between the fixed base 32 and the movable base 31. The limit pulley 34 is limited to rotate in the limit chute 33, and the movable base 31 is limited to move on the fixed base 32 through the limit chute 33 and the limit pulley 34. In this embodiment, the limit chute 33 is provided on the fixed base 32, the limit pulley 34 is connected to the movable base 31 through a base connecting member 35, the movable base 31 is fixedly connected to the base connecting member 35, and the limit pulley 34 is limited to rotate at one end of the base connecting member 35. In actual situations, a foam body for supporting passengers is provided on the movable base 31, and the passengers sit on the movable base 31 and move along the axial direction of the limit chute 33.

[0030] Please refer to Figure 1 - Figure 2 , the leg rest structure 4 includes a leg rest mounting bracket 41, a first connecting rod 42, a second connecting rod 43, a first support rod 44, a second support rod 45 and a leg rest support 46. The leg rest mounting bracket 41 is fixedly connected to the movable base 31 and is provided at one end of the movable base 31 close to the leg rest structure 4. One end of the first connecting rod 42 is limited to rotate on the leg rest mounting bracket 41 and the other end is rotatably connected to one end of the first support rod 44. One end of the second connecting rod 43 is limited to rotate on the leg rest mounting bracket 41 and the other end is rotatably connected to one end of the second support rod 45. The other end of the first support rod 44 is limited to rotate on the leg rest support 46, and the other end of the second support rod 45 is limited to rotate on the leg rest support 46. The length of the first connecting rod 42 is longer than that of the second connecting rod 43, and the length of the first support rod 44 is shorter than that of the second support rod 45. The leg rest support 46 is fixedly provided with a leg rest support tray 47, and the leg rest support tray 47 is used to support the legs of passengers in actual applications. Rotating the first connecting rod 42 or the second connecting rod 43 generates a linkage effect among the first connecting rod 42, the second connecting rod 43, the first support rod 44, the second support rod 45 and the leg rest support 46, so as to realize the flipping of the leg rest structure 4 and finally realize the extension and folding of the leg rest support 46.

[0031] Please refer to Figure 2, the driving component 1 is arranged below the seat cushion structure 3. The driving component 1 drives the movable base 31 to achieve linear motion, and realizes the flipping of the leg rest structure 4 and the rotation of the back support structure 5 through the linkage structure 2. The driving component 1 includes a driving element 11, a driving connection seat 12 and a driving track 13. The driving element 11 is an electric cylinder with a linear motion at the output end. The axial direction of the driving track 13 is the same as that of the limiting sliding groove 33. The driving track 13 is arranged below the movable base 31. The driving element 11 drives the driving connection seat 12 to move along the driving track 13. The driving moving seat is fixedly connected to the movable base 31. The driving connection seat 12 and the movable base 31 move synchronously and in the same direction. In order to leave enough space for the leg rest structure 4 to be hidden at one end of the fixed base 32 when folded, the driving moving seat is fixedly connected to the end of the movable base 31 away from the leg rest structure 4.

[0032] Please refer to Figure 1 - Figure 2 , the back support structure 5 includes a back support frame 51, a back support rod 52 and a back mounting rod 53. One end of the back support rod 52 is fixedly connected to the back support frame 51, and the other end is rotatably connected to the back mounting rod 53. The back mounting rod 53 is fixedly connected to the movable base 31. When the movable base 31 moves, the back support rod 52 moves with the movable base 31, so that the back support frame 51 moves with the movement of the back support rod 52.

[0033] Please refer to Figure 1 - Figure 2 , the linkage structure 2 includes a first linkage rod 21, a second linkage rod 22, a third linkage rod 23, a fourth linkage rod 24 and a linkage fixing part 25. The linkage fixing part 25 is fixedly connected to the movable base 31. A leg rest connecting rod is fixedly arranged between the leg rest mounting brackets 41. Both ends of the leg rest connecting rod are fixedly connected to the corresponding leg rest mounting brackets 41. The linkage fixing part 25 is welded to the leg rest connecting rod and the end of the movable base 31 close to the leg rest structure 4.

[0034] The first linkage rod 21 is arranged on the side of the back support frame 51 away from the movable base 31. One end of the first linkage rod 21 is rotationally limited on the fixed base 32, and the other end is rotatably connected to the second linkage rod 22. The connection point of the first linkage rod 21 and the second linkage rod 22 is higher than the movable base 31. The first linkage rod 21 is used to accelerate the moving distance of the second linkage rod 22 and the third linkage rod 23, so as to form a displacement difference between the third linkage rod 23 and the linkage fixing member 25. The second linkage rod 22 is shaped like a "Y" and has three ends, which are Y1, Y2, and Y3 respectively. Among them, the Y1 end of the second linkage rod 22 is the end away from the movable base 31, and the Y2 end and the Y3 end of the second linkage rod 22 are both the ends close to the movable base 31. The Y1 end of the second linkage rod 22 is rotatably connected to the first linkage rod 21, the Y2 end is rotatably connected to the back mounting rod 53, and the Y3 end is rotatably connected to one end of the third linkage rod 23. A back connecting rod 54 is provided between the second linkage rod 22 and the back support rod 52. The two ends of the back connecting rod 54 are respectively rotatably connected to the second linkage rod 22 or the back support rod 52. The back connecting rod 54 limits the moving range of the second linkage rod 22, and at the same time, the second linkage rod 22 drives the back support rod 52 and the back support frame 51 through the back connecting rod 54.

[0035] One end of the third linkage rod 23 is rotatably connected to the Y3 end of the second linkage rod 22. One end of the fourth linkage member is rotatably connected to the second link 43 on the leg rest structure 4, and the other end is rotatably connected to the third linkage rod 23. The overall shape of the third linkage rod 23 is similar to a "J". A track groove 26 and a track roller 27 are provided between the third linkage rod 23 and the linkage fixing member 25. The track groove 26 includes a first track segment 261 and a second track segment 262, and the first track segment 261 and the second track segment 262 are connected. The track roller 27 is limited to move within the track groove 26. The first track segment 261 is inclined upward, and the second track segment 262 is inclined downward. The inclination angle of the second track segment 262 is greater than the inclination angle of the second track segment 262. In this embodiment, specifically, the track groove 26 is provided on the linkage fixing member 25, and the track roller 27 is rotationally limited on the third linkage rod 23. In order to reduce the assembly gap between the track groove 26 and the track roller 27, a track fixing member 28 is fixedly provided on the third linkage rod 23. The track fixing member 28 is fixedly riveted to the third linkage member, and the track roller 27 is rotationally limited on the track fixing member 28.

[0036] Please refer to Figure 3 - Figure 8, during the movement of the movable base 31, the linkage fixing member 25 and the second linkage rod 22 move synchronously with the movable base 31. One end of the first linkage rod 21 is pulled by the second linkage rod 22 and moves towards the movable base 31 and rotates towards the fixed base 32. At the same time, the second linkage rod 22 receives the reaction force from the first linkage rod 21. At this time, the second linkage rod 22 acts like a lever. The Y1 end of the second linkage rod 22 is pressed towards the fixed base 32, the Y2 end of the second linkage rod 22 is the fulcrum, and the Y3 end of the second linkage rod 22 is pushed forward. The third linkage member is pushed by the second linkage member, and a displacement difference is generated between the third linkage member and the track fixing member 28, thereby pushing the track roller 27 to move only along the first track groove 26, causing the fourth linkage member to move, and finally causing the second link 43 to flip; when the track roller 27 moves along the first track groove 26 to between the first track groove 26 and the second track groove 26, at this time, the second link 43 flips to the limit. The movable base 31 continues to move. One end of the first linkage rod 21 is pulled by the second linkage rod 22 and moves towards the movable base 31 and continues to rotate towards the fixed base 32. The second linkage rod 22 receives the reaction force from the first linkage rod 21, and the Y3 end of the second linkage rod 22 continues to be pushed forward. The third linkage member is pushed by the second linkage member, and a displacement difference is generated between the third linkage member and the track fixing member 28, thereby pushing the track roller 27 to continue to move only along the second track groove 26. At this time, the Y1 end of the second linkage member continues to move downward. Due to the setting of the back connecting rod 54, the back support rod 52 is pulled towards the fixed base 32, thereby causing the back support frame 51 to rotate around the back mounting rod 53. When the movable base 31 is reset, each component resets according to the original track.

[0037] Working principle and usage process of the present invention: In the original sitting posture state, the driving component 1 drives the movable base 31 to move on the fixed base 32. The track roller 27 moves with limited displacement in the first track segment 261, and the leg rest structure 4 flips and extends. The backrest support frame moves with the movable base 31 but does not flip. When the track roller 27 reaches the connection position between the first track segment 261 and the second track segment 262, the leg rest structure 4 is fully extended. The driving component 1 continues to drive the movable base 31 to move on the fixed base 32. The track roller 27 moves with limited displacement in the second track segment 262, and the backrest support frame flips as the movable base 31 moves. When the movable base 31 reaches the limit position, the backrest support frame is fully flipped, and the leg rest structure 4 is fully extended, thereby achieving the zero-gravity sitting posture state.

[0038] In the above process, using one driving component 1 can achieve the flipping of the leg rest structure 4 and the flipping of the backrest support frame, and the flipping process of the leg rest structure 4 and the flipping of the backrest support frame are carried out separately. Therefore, the dumping angle of the backrest support frame can be flexibly adjusted according to individual needs.

[0039] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A zero-gravity seat linkage skeleton, comprising a drive assembly (1), a linkage structure (2), a seat cushion structure (3), a leg rest structure (4), and a back support rod (52), characterized in that, The seat cushion structure (3) includes a movable base (31) and a fixed base (32). The driving assembly (1) drives the movable base (31) to slide in a limited manner on the fixed base (32). The back support rod (52) is rotatably connected to the movable base (31) through a back mounting rod (53). The linkage structure (2) includes a first linkage rod (21), a second linkage rod (22), a third linkage rod (23), a fourth linkage rod (24), and a linkage fixing member (25). The linkage fixing member (25) is fixedly connected to the movable base (31). One end of the first linkage rod (21) is rotatably limited on the fixed base (32). Different ends of the second linkage rod (22) are respectively rotatably connected to the first linkage rod (21), the back mounting rod (53), and the third linkage rod (23). A back connecting rod (54) is provided between the second linkage rod (22) and the back support rod (52). A track groove (26) and a track roller (27) are provided between the third linkage rod (23) and the linkage fixing member (25). The track groove (26) includes a first track segment (261) and a second track segment (262). The third linkage rod (23) is connected to the leg rest structure (4) through the fourth linkage rod (24). When the track roller (27) moves on the first track segment (261), the leg rest structure (4) is driven by the fourth linkage member to flip. When the track roller (27) moves on the first track segment (261), the back support rod (52) is driven by the second linkage member to rotate.

2. The linkage framework of a zero-gravity seat according to claim 1, wherein The leg rest structure (4) includes a leg rest mounting frame (41), a first connecting rod (42), a second connecting rod (43), a first support rod (44), a second support rod (45), and a leg rest support member (46). The leg rest mounting frame (41) is fixedly connected to the movable base (31). One end of the first connecting rod (42) is rotatably limited on the leg rest mounting frame (41), and the other end is rotatably connected to one end of the first support rod (44). One end of the second connecting rod (43) is rotatably limited on the leg rest mounting frame (41), and the other end is rotatably connected to one end of the second support rod (45). The other end of the first support rod (44) is rotatably limited on the leg rest support member (46). The other end of the second support rod (45) is rotatably limited on the leg rest support member (46). One end of the fourth linkage member is rotatably connected to the second connecting rod (43), and the other end is rotatably connected to the third linkage rod (23).

3. The linkage skeleton of a zero-gravity seat according to claim 1, characterized in that, The length of the first connecting rod (42) is longer than the length of the second connecting rod (43). The length of the first support rod (44) is shorter than the length of the second support rod (45).

4. A zero-gravity seat linkage skeleton according to claim 1, wherein, The second linkage rod (22) is shaped like a "Y" and has three ends, namely Y1, Y2, and Y3. The Y1 end of the second linkage rod (22) is the end far from the movable base (31). The Y2 end and the Y3 end of the second linkage rod (22) are both the ends close to the movable base (31). The Y1 end of the second linkage rod (22) is rotatably connected to the first linkage rod (21), the Y2 end is rotatably connected to the back mounting rod (53), and the Y3 end is rotatably connected to one end of the third linkage rod (23).

5. The linkage skeleton of a zero-gravity seat according to claim 1, characterized in that, The first track segment (261) is inclined upward, and the second track segment (262) is inclined downward. The inclination angle of the second track segment (262) is greater than that of the second track segment (262).

6. The linkage framework of a zero-gravity seat according to claim 1, characterized in that It includes a back support frame (51). One end of the back support rod (52) is fixedly connected to the back support frame (51), and the other end is rotatably connected to the back mounting rod (53). The back mounting rod (53) is fixedly connected to the movable base (31).

7. The linkage skeleton of a zero-gravity seat according to claim 1, characterized in that, The third linkage rod (23) is fixedly provided with a track fixing member (28). The track fixing member (28) is fixedly riveted to the third linkage member, and the track roller (27) is limited to rotate on the track fixing member (28).

8. The linkage skeleton of a zero-gravity seat according to claim 1, characterized in that, A limiting chute (33) and a limiting pulley (34) are provided between the fixed base (32) and the movable base (31). The limiting pulley (34) is limited to rotate in the limiting chute (33), and the movable base (31) is limited to move on the fixed base (32) through the limiting chute (33) and the limiting pulley (34).

9. The linkage skeleton of a zero-gravity seat according to claim 8, characterized in that, The limiting chute (33) is provided on the fixed base (32). The limiting pulley (34) is connected to the movable base (31) through a base connecting member (35). The movable base (31) is fixedly connected to the base connecting member (35), and the limiting pulley (34) is limited to rotate at one end of the base connecting member (35).

10. A zero-gravity seat linkage skeleton according to claim 8, characterized in that, The driving assembly (1) includes a driving element (11), a driving connection seat (12), and a driving track (13). The axial direction of the driving track (13) is the same as the axial direction of the limiting chute (33). The driving track (13) is arranged below the movable base (31). The driving element (11) drives the driving connection seat (12) to move along the driving track (13), and the driving moving seat is fixedly connected to the movable base (31).

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