A four-link rotating shaft linkage structure

Abstract

The present invention discloses a four-link shaft linkage structure, comprising a bottom support frame, a U-shaped plate, two upper shaft mechanisms, two lower shaft mechanisms and two connecting rod mechanisms, wherein the two upper shaft mechanisms are respectively arranged on both sides of the U-shaped plate, and the two lower shaft mechanisms are respectively arranged on both sides of the bottom support frame, and the upper shaft mechanisms and the lower shaft mechanisms located on the same side are respectively connected by a connecting rod mechanism, wherein the upper shaft mechanism of the U-shaped plate is an axis-centered movable rotation, and the lower shaft mechanism at the bottom of the connecting rod mechanism is an axis-centered movable rotation, and the connecting rod mechanism can synchronously transmit the rotation of the lower shaft mechanism to the upper shaft mechanism. The U-shaped plate of the present invention can rotate around the upper shaft mechanism, and the display can be rotated and adjusted separately at an angle; the lower shaft mechanism is fixedly connected to the bottom support frame, and is linked to the upper shaft mechanism through a connecting rod mechanism, and when the lower shaft mechanism moves, the upper shaft can be driven to realize synchronous rotation, so that the display and the desktop can maintain a certain angle of rotation.

Description

Technical Field

[0001] The invention relates to the field of rotating shafts, and in particular to a four-link rotating shaft linkage structure. Background Art

[0002] In the prior art, a shaft, as the name implies, is a shaft that must be used to connect the main parts of a product and is used to withstand both bending and torque during rotation. Common shafts include mobile phone shafts (flip or rotating screen mobile phones), laptop shafts, portable DVD shafts, LED desk lamp shafts, LCD display shafts, GPS and other vehicle bracket shafts, etc.

[0003] The hinge used to connect the computer monitor generally adopts a flip-type hinge structure, which can make the display screen rotate around the hinge to a certain angle and support the display screen to adjust the angle of the computer monitor. However, the computer monitors on the market are generally installed on the base through a single hinge, and the display can only be adjusted by flipping. The range of the display angle adjustment is narrow, and the display cannot be freely rotated and adjusted, which is difficult to meet the needs of users who need to rotate the display at multiple angles for adjustment.

[0004] Therefore, the prior art has defects and needs to be improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a four-link shaft linkage structure which is easy to operate, compact in structure, has double shaft linkage and the upper shaft can rotate freely.

[0006] The technical solution of the present invention is as follows: a four-linkage shaft linkage structure, comprising a bottom support frame, a U-shaped plate, two upper shaft mechanisms, two lower shaft mechanisms and two connecting rod mechanisms, the U-shaped plate is arranged above the bottom support frame, the two upper shaft mechanisms are respectively arranged on both sides of the U-shaped plate, the two lower shaft mechanisms are respectively arranged on both sides of the bottom support frame, the upper shaft mechanism and the lower shaft mechanism located on the same side are respectively connected by a connecting rod mechanism, the upper shaft mechanism of the U-shaped plate is axially movable and rotating, the lower shaft mechanism at the bottom of the connecting rod mechanism is axially movable and rotating, the upper shaft mechanism at the top of the connecting rod mechanism is axially movable and rotating, the lower shaft mechanism is fixed on the bottom support frame, and the connecting rod mechanism can synchronously transmit the rotation of the lower shaft mechanism to the upper shaft mechanism.

[0007] By adopting the above-mentioned technical scheme, in the four-link shaft linkage structure, each of the upper shaft mechanisms includes an upper shaft, a first torsion spring, a first nut, an upper support, a spring clamp and a plurality of first spring washers. The top of the upper support is connected to the bottom surface of the U-shaped plate, the first end of the upper shaft is movably connected to the top of the connecting rod mechanism, and the second end of the upper shaft passes through the side of the U-shaped plate, the spring clamp, the first torsion spring, the bottom of the upper support in sequence and is connected to the first nut; a first bayonet is provided on the outer edge of the spring clamp, and a second bayonet is provided on the side edge of the U-shaped plate, one end of the first torsion spring is connected to the upper support, and the other end of the first torsion spring is respectively against the first bayonet and the second bayonet, and a plurality of first spring washers are respectively provided on both sides of the bottom of the upper support.

[0008] By adopting the above-mentioned technical solutions, in the four-link shaft linkage structure, each of the lower shaft mechanisms includes a lower shaft, a second torsion spring, a second nut, a first lower support member and a second lower support member, the bottoms of the first lower support member and the second lower support member are respectively fixedly connected to the bottom support frame, the first end of the lower shaft is movably connected to the connecting rod mechanism, the second end of the lower shaft passes through the first lower support member and the second lower support member in sequence and is connected to the second nut, the lower shaft is fixed to the first lower support member and the second lower support member, one end of the second torsion spring is connected to the second lower support member, and the other end of the second torsion spring is connected to the connecting rod mechanism.

[0009] By adopting the above-mentioned technical solutions, in the four-link shaft linkage structure, each of the connecting rod mechanisms includes a connecting bracket, two connecting rods and two discs, the top and bottom of the connecting bracket are respectively provided with movable grooves, the movable grooves are provided with discs, the upper rotating shaft and the lower rotating shaft are respectively clamped with the discs, each of the discs is symmetrically provided with two pins along the circumferential direction, the two connecting rods are arranged parallel to each other in the connecting bracket, and the top end of the connecting rod is movably connected to the pin of the upper disc, the bottom end of the connecting rod is movably connected to the pin of the lower disc, and the bottom of the connecting bracket is connected to the second torsion spring.

[0010] By adopting the above-mentioned technical solutions, in the four-bar connecting shaft linkage structure, the upper rotating shaft mechanism also includes a first limit block, the first limit block is sleeved on the upper rotating shaft, the first limit block is provided with an upper sliding block, the two sides of the U-shaped plate are respectively provided with first limit arc grooves, and the upper sliding block is arranged in the first limit arc grooves.

[0011] By adopting the above-mentioned technical solutions, in the four-bar connecting shaft linkage structure, the lower rotating shaft mechanism also includes a second limit block, the second limit block is sleeved on the lower rotating shaft, the second limit block is provided with a lower sliding block, and a second limit arc groove is provided on the side of the bottom of the connecting bracket close to the second torsion spring, and the lower sliding block is arranged in the second limit arc groove.

[0012] By adopting the above-mentioned technical solutions, in the four-bar connecting shaft linkage structure, the upper rotating shaft mechanism also includes a first sleeve, the first sleeve is sleeved between the upper rotating shaft and the first torsion spring, and the length of the first sleeve is greater than the length of the first torsion spring.

[0013] By adopting the above-mentioned technical solutions, in the four-bar connecting shaft linkage structure, the lower rotating shaft mechanism also includes a second sleeve, the second sleeve is sleeved between the lower rotating shaft and the second torsion spring, and the length of the second sleeve is greater than the length of the second torsion spring.

[0014] By adopting the above-mentioned technical solutions, in the four-bar connecting shaft linkage structure, the lower rotating shaft mechanism also includes a flat gasket and a second spring gasket, and the flat gasket and the second spring gasket are respectively sleeved on the lower rotating shaft, the flat gasket abuts against the second spring gasket, and the second spring gasket abuts against the second nut.

[0015] By adopting the above-mentioned technical solutions, in the four-link shaft linkage structure, the upper shaft and the lower shaft have the same structure, the upper and lower surfaces of the upper shaft and the lower shaft are flattened, and the upper shaft and the lower shaft are respectively connected to the center of the disc.

[0016] By adopting the above-mentioned technical solutions, the U-shaped plate of the present invention can rotate around the upper shaft mechanism, and the display connected to the U-shaped plate can be rotated and adjusted at an angle individually; the lower shaft mechanism is fixedly connected to the bottom support frame, and is linked to the upper shaft mechanism through a connecting rod mechanism. When the lower shaft mechanism moves, it can drive the upper shaft to rotate synchronously, so that the lower shaft mechanism and the upper shaft mechanism can rotate at the same angle, so that a certain angle of rotation is maintained between the display and the desktop; the overall structure is compact, the operation method is simple and convenient, and the adjustment angle range is wide, which meets the user's needs for rotating and adjusting the display at multiple angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the upper rotating shaft mechanism of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the lower rotating shaft mechanism of the present invention;

[0019] Figure 3 It is a schematic diagram of the connecting rod mechanism structure of the present invention;

[0020] Figure 4 It is a schematic diagram of the assembly of the connecting rod structure and the upper rotating shaft structure of the present invention;

[0021] Figure 5 It is a partial structural schematic diagram of the upper rotating shaft mechanism of the present invention;

[0022] Figure 6 It is a schematic diagram of the disc structure of the present invention;

[0023] Figure 7 It is a schematic diagram of the connecting bracket structure of the present invention. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 7 As shown, a four-linkage shaft linkage structure comprises a bottom support frame 1, a U-shaped plate 2, two upper shaft mechanisms 3, two lower shaft mechanisms 4 and two connecting rod mechanisms 5, wherein the U-shaped plate 2 is arranged above the bottom support frame 1, the two upper shaft mechanisms 3 are arranged on both sides of the U-shaped plate 2, and the two lower shaft mechanisms 4 are arranged on both sides of the bottom support frame 1, and the upper shaft mechanisms 3 and the lower shaft mechanisms 4 located on the same side are connected by a connecting rod mechanism 5, respectively, the upper shaft mechanism 3 of the U-shaped plate 2 is axially movable and rotated, the bottom of the connecting rod mechanism 5 is axially movable and rotated, the top of the connecting rod mechanism 5 is axially movable and rotated, and the lower shaft mechanism 4 is fixed on the bottom support frame 1, and the connecting rod mechanism 5 can synchronously transmit the rotation of the lower shaft mechanism 4 to the upper shaft mechanism 3. The bottom support frame 1 can be connected to a base connected to a display, and the U-shaped plate 2 can be installed and connected to the display. The U-shaped plate 2 can rotate around the upper rotating shaft mechanism 3, that is, the display can rotate around the upper rotating shaft mechanism 3 to adjust the angle. The lower rotating shaft mechanism 4 is connected to the upper rotating shaft mechanism 3 through the connecting rod mechanism 5, so that when the lower rotating shaft mechanism 4 rotates, it can also drive the upper rotating shaft mechanism 3 to rotate synchronously, that is, when the lower rotating shaft mechanism 4 moves, the display and the desktop always maintain a certain angle for rotation.

[0026] like Figure 1 , Figure 4 and Figure 5As shown, each of the upper rotating shaft mechanisms 3 includes an upper rotating shaft 31, a first torsion spring 32, a first nut 33, an upper support member 34, a spring clamp 35 and a plurality of first spring washers 36. The top of the upper support member 34 is connected to the bottom surface of the U-shaped plate 2. The first end of the upper rotating shaft 31 is movably connected to the top of the connecting rod mechanism 5. The second end of the upper rotating shaft 31 passes through the side of the U-shaped plate 2, the spring clamp 35, the first torsion spring 32, the bottom of the upper support member 34 and is connected to the first nut 33 in sequence. A first bayonet 351 is provided on the outer edge of the spring clamp 35, and a second bayonet 21 is provided on the side edge of the U-shaped plate 2. One end of the first torsion spring 32 is connected to the upper support member 34, and the other end of the first torsion spring 32 is respectively against the first bayonet 351 and the second bayonet 21. A plurality of first spring washers 36 are respectively provided on both sides of the bottom of the upper support member 34. In this way, the upper rotating shaft mechanism 3 can be rotated independently, so that the display can be rotated around the upper rotating shaft mechanism 3 to adjust the angle. Specifically, when the U-shaped plate 2 is rotated, since the U-shaped plate 2 is connected to one end of the first torsion spring 32 through the upper support member 34, and the other end of the first torsion spring 32 is respectively abutted against the first snap hole 351 of the spring snap plate 35 and the second snap buckle 21 of the U-shaped plate 2, the U-shaped plate 2 can drive the second torsion spring 32 to rotate around the upper rotating shaft 31 when rotating. At the same time, since a plurality of first spring washers 36 are respectively arranged on both sides of the bottom of the upper supporting rod 34, by adjusting the locking force of the first nut 33, the first spring washers 36 squeeze both sides of the upper supporting rod 34, thereby generating a damping force, so that the upper rotating shaft 31 can stay stably after the rotation is completed, and has a certain resistance, and is not easy to shake.

[0027] like Figure 2 As shown, preferably, each of the lower rotating shaft mechanisms 4 includes a lower rotating shaft 41, a second torsion spring 42, a second nut 43, a first lower support member 44 and a second lower support member 45, the bottoms of the first lower support member 44 and the second lower support member 45 are respectively fixedly connected to the bottom support frame 1, the first end of the lower rotating shaft 41 is movably connected to the connecting rod mechanism 5, the second end of the lower rotating shaft 41 passes through the first lower support member 44 and the second lower support member 45 in sequence and is connected to the second nut 43, the lower rotating shaft 41 is fixed on the first lower support member 44 and the second lower support member 45, one end of the second torsion spring 42 is connected to the second lower support member 45, and the other end of the second torsion spring 42 is connected to the connecting rod mechanism 5. Since the connecting rod mechanism 5 is connected to the lower rotating shaft 41 through the second torsion spring 42, and the lower rotating shaft 41 is fixedly connected to the bottom support frame 1, when the bottom support frame 1 is rotated, the lower rotating shaft 41 can rotate therewith. The provision of the second torsion spring 42 can increase the resistance between the lower rotating shaft mechanism 4 and the connecting rod mechanism 5, thereby achieving the effect of damping positioning and stopping.

[0028] like Figure 2As shown, further, in order to enhance the damping effect of the lower rotating shaft mechanism 4, the lower rotating shaft mechanism 4 further includes a flat gasket 47 and a second spring gasket 48, which are respectively sleeved on the lower rotating shaft 41, the flat gasket 47 abuts against the second spring gasket 48, and the second spring gasket 48 abuts against the second nut 33. By adjusting the squeezing friction between the second nut 43 and the flat gasket 47 and the second spring gasket 48, the lower rotating shaft mechanism 4 can automatically stay stable when rotating to a certain angle, thereby improving the damping rotation effect of the lower rotating shaft mechanism 4.

[0029] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, as preferred, each of the connecting rod mechanisms 5 comprises a connecting bracket 51, two connecting rods 52 and two discs 53, the connecting bracket 51 is provided with a movable groove 511 at the top and bottom, the movable groove 511 is provided with a disc 53, the upper rotating shaft 31 and the lower rotating shaft 41 are respectively engaged with the disc 53, each of the discs 53 is symmetrically provided with two pins 531 along the circumferential direction, the two connecting rods 52 are arranged in parallel in the connecting bracket 51, and the top of the connecting rod 52 is movably connected with the pin 531 of the upper disc 53, the bottom of the connecting rod 52 is movably connected with the pin 531 of the lower disc 53, and the bottom of the connecting bracket 51 is connected with the second torsion spring 42. When the lower rotating shaft mechanism 4 rotates together with the bottom support frame 1, the upper rotating shaft mechanism 3 can be driven to rotate synchronously through the transmission effect of the connecting rod mechanism 5. Specifically, since the lower rotating shaft 41 and the upper rotating shaft 31 are respectively engaged with the disc 53, when the lower rotating shaft 4 rotates, the disc 53 at the bottom of the connecting bracket 51 can be driven to rotate, and the discs 53 at both ends of the connecting bracket 51 are connected by the connecting rod 52, so that the rotation of the disc 53 at the bottom of the connecting bracket 51 drives the top disc 53 to rotate through the connecting rod 52, and since the disc 53 at the top of the connecting bracket 51 is engaged with the upper rotating shaft 31, the upper rotating shaft 31 is driven to rotate, and the upper rotating shaft 31 is connected to the U-shaped plate 2 through the upper support block 34, thereby driving the display connected to the U-shaped plate 2 to rotate. The bottom of the connecting bracket 51 is connected to the second torsion spring 42, so that the lower rotating shaft 41 has an elastic resistance when rotating, thereby enhancing the damping effect between the lower rotating shaft mechanism 4 and the connecting rod mechanism 5. It should be noted that in this embodiment, when the lower shaft 41 rotates 1 degree, the upper shaft 31 also rotates 1 degree, that is, when the lower shaft 41 rotates, the upper shaft 31 can rotate at the same angle, ensuring that the display and the desktop always maintain a certain angle rotation.

[0030] like Figure 4As shown, further, the upper rotating shaft mechanism 3 also includes a first limit block 38, the first limit block 38 is sleeved on the upper rotating shaft 31, the first limit block 38 is provided with an upper slider 381, the two sides of the U-shaped plate 2 are respectively provided with first limit arc grooves 22, and the upper slider 381 is arranged in the first limit arc grooves 22. When the upper rotating shaft 31 rotates driven by the connecting rod mechanism 5, since the first limit block 38 is sleeved on the upper rotating shaft 31, the upper slider 381 of the first limit block 38 can slide and abut against each other in the first limit arc groove 22 of the U-shaped plate 2, thereby driving the U-shaped plate 2 to rotate stably.

[0031] like Figure 2 and Figure 7 As shown, further, the lower rotating shaft mechanism 4 also includes a second limit block 49, the second limit block 49 is sleeved on the lower rotating shaft 41, the second limit block 49 is provided with a lower slider 491, the bottom of the connecting bracket 51 is provided with a second limit arc groove 512 on one side close to the second torsion spring 42, and the lower slider 491 is arranged in the second limit arc groove 512. The second limit block 49 can limit the fixed rotation angle of the lower rotating shaft 41 to avoid the angle between the lower rotating shaft mechanism 4 and the connecting rod mechanism 5 being adjusted too small or too large to cause structural damage.

[0032] like Figure 3 As shown, further, in order to simplify the stable structure, the upper rotating shaft 31 and the lower rotating shaft 41 have the same structure, and the upper and lower surfaces of the upper rotating shaft 31 and the lower rotating shaft 41 are flattened, and the upper rotating shaft 31 and the lower rotating shaft 41 are respectively connected to the center of the disc 53. The upper rotating shaft 31 and the lower rotating shaft 41 are respectively arranged at the center of the disc 53, which can improve the motion transmission effect between the lower rotating shaft 41 and the upper rotating shaft 31 and avoid shaking.

[0033] like Figure 1 As shown, further, in order to improve the service life of the upper rotating shaft mechanism 3, the upper rotating shaft mechanism 3 also includes a first sleeve 37, the first sleeve 37 is sleeved between the upper rotating shaft 31 and the first torsion spring 32, and the length of the first sleeve 37 is greater than the length of the first torsion spring 32. The provision of the first sleeve 37 can effectively prevent the first torsion spring 32 from twisting in the radial direction, and can also effectively prevent the first torsion spring 32 from being damaged due to excessive compression deformation.

[0034] like Figure 2 As shown, further, in order to improve the service life of the lower rotating shaft mechanism 4, the lower rotating shaft mechanism 4 also includes a second sleeve 46, the second sleeve 46 is sleeved between the lower rotating shaft 41 and the second torsion spring 42, and the length of the second sleeve 46 is greater than the length of the second torsion spring 42. The provision of the second sleeve 46 can effectively prevent the second torsion spring 42 from twisting in the radial direction, and can also effectively prevent the second torsion spring 42 from being damaged due to excessive compression deformation.

[0035] By adopting the above-mentioned technical solutions, the U-shaped plate of the present invention can rotate around the upper shaft mechanism, and the display connected to the U-shaped plate can be rotated and adjusted at an angle individually; the lower shaft mechanism is fixedly connected to the bottom support frame, and is linked to the upper shaft mechanism through a connecting rod mechanism. When the lower shaft mechanism moves, it can drive the upper shaft to rotate synchronously, so that the lower shaft mechanism and the upper shaft mechanism can rotate at the same angle, so that a certain angle of rotation is maintained between the display and the desktop; the overall structure is compact, the operation method is simple and convenient, and the adjustment angle range is wide, which meets the user's needs for rotating and adjusting the display at multiple angles.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A four-link shaft linkage structure, characterized in that: It includes a bottom support frame, a U-shaped plate, two upper rotating shaft mechanisms, two lower rotating shaft mechanisms and two connecting rod mechanisms, the U-shaped plate is arranged above the bottom support frame, the two upper rotating shaft mechanisms are respectively arranged on both sides of the U-shaped plate, the two lower rotating shaft mechanisms are respectively arranged on both sides of the bottom support frame, the upper rotating shaft mechanism and the lower rotating shaft mechanism located on the same side are respectively connected by a connecting rod mechanism, the upper rotating shaft mechanism of the U-shaped plate is axially movable and rotated, the lower rotating shaft mechanism at the bottom of the connecting rod mechanism is axially movable and rotated, the upper rotating shaft mechanism at the top of the connecting rod mechanism is axially movable and rotated, the lower rotating shaft mechanism is fixed on the bottom support frame, and the connecting rod mechanism can synchronously transmit the rotation of the lower rotating shaft mechanism to the upper rotating shaft mechanism; Each of the upper rotating shaft mechanisms includes an upper rotating shaft, a first torsion spring, a first nut, an upper support member, a spring clamp and a plurality of first spring washers. The top of the upper support member is connected to the bottom surface of the U-shaped plate, the first end of the upper rotating shaft is movably connected to the top of the connecting rod mechanism, and the second end of the upper rotating shaft passes through the side of the U-shaped plate, the spring clamp, the first torsion spring, the bottom of the upper support member in sequence and is connected to the first nut; a first bayonet is provided on the outer edge of the spring clamp, and a second bayonet is provided on the side edge of the U-shaped plate. One end of the first torsion spring is connected to the upper support member, and the other end of the first torsion spring is respectively abutted against the first bayonet and the second bayonet, and a plurality of first spring washers are respectively provided on both sides of the bottom of the upper support member.

2. The four-link shaft linkage structure according to claim 1, characterized in that: Each of the lower rotating shaft mechanisms includes a lower rotating shaft, a second torsion spring, a second nut, a first lower support member and a second lower support member, the bottoms of the first lower support member and the second lower support member are respectively fixedly connected to the bottom support frame, the first end of the lower rotating shaft is movably connected to the connecting rod mechanism, the second end of the lower rotating shaft passes through the first lower support member and the second lower support member in sequence and is connected to the second nut, the lower rotating shaft is fixed to the first lower support member and the second lower support member, one end of the second torsion spring is connected to the second lower support member, and the other end of the second torsion spring is connected to the connecting rod mechanism.

3. The four-link shaft linkage structure according to claim 2, characterized in that: Each of the connecting rod mechanisms includes a connecting bracket, two connecting rods and two discs. The top and bottom of the connecting bracket are respectively provided with movable grooves, and discs are provided in the movable grooves. The upper rotating shaft and the lower rotating shaft are respectively clamped with the discs. Each of the discs is symmetrically provided with two pins along the circumferential direction. The two connecting rods are arranged in parallel in the connecting bracket, and the top end of the connecting rod is movably connected to the pin of the upper disc, and the bottom end of the connecting rod is movably connected to the pin of the lower disc. The bottom of the connecting bracket is connected to the second torsion spring.

4. The four-link shaft linkage structure according to claim 1, characterized in that: The upper rotating shaft mechanism also includes a first limit block, which is sleeved on the upper rotating shaft. The first limit block is provided with an upper sliding block. The two sides of the U-shaped plate are respectively provided with first limit arc grooves, and the upper sliding block is arranged in the first limit arc grooves.

5. The four-link shaft linkage structure according to claim 3, characterized in that: The lower rotating shaft mechanism also includes a second limit block, which is sleeved on the lower rotating shaft. The second limit block is provided with a lower sliding block. A second limit arc groove is provided on the side of the bottom of the connecting bracket close to the second torsion spring, and the lower sliding block is arranged in the second limit arc groove.

6. The four-link shaft linkage structure according to claim 1, characterized in that: The upper rotating shaft mechanism also includes a first sleeve, which is sleeved between the upper rotating shaft and the first torsion spring, and the length of the first sleeve is greater than the length of the first torsion spring.

7. The four-link rotating shaft linkage structure according to claim 2, characterized in that: The lower rotating shaft mechanism also includes a second sleeve, which is sleeved between the lower rotating shaft and the second torsion spring, and the length of the second sleeve is greater than the length of the second torsion spring.

8. The four-link shaft linkage structure according to claim 2, characterized in that: The lower rotating shaft mechanism also includes a flat washer and a second spring washer, which are respectively sleeved on the lower rotating shaft, the flat washer abuts against the second spring washer, and the second spring washer abuts against the second nut.

9. The four-link shaft linkage structure according to claim 3, characterized in that: The upper rotating shaft and the lower rotating shaft have the same structure. The upper and lower surfaces of the upper rotating shaft and the lower rotating shaft are flattened. The upper rotating shaft and the lower rotating shaft are respectively connected to the center of the disc.

Images