Lifting arm

Abstract

The invention belongs to the technical field of medical instruments, and particularly provides a lifting arm which comprises a first connecting base, a second connecting base, an upper supporting assembly, a lower supporting assembly, a connecting rod assembly and a spring. The two ends of the lower supporting assembly are rotationally connected with the first connecting base and the second connecting base correspondingly, the lower supporting assembly is located below the upper supporting assembly, and the first connecting base, the upper supporting assembly, the second connecting base and the lower supporting assembly form a parallelogram structure; one end of the connecting rod assembly is slidably connected with the upper supporting assembly, the other end of the connecting rod assembly is rotationally connected with the first connecting base, and the rotating axis position of the connecting rod assembly and the first connecting base is adjustable. The two ends of the spring abut against the connecting rod assembly and the upper supporting assembly respectively, and the position of the abutting point of the spring and the upper supporting assembly is adjustable. The lifting arm can be matched with different loads for use and is high in universality.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, and more specifically, relates to a lifting arm. Background Art

[0002] Among various medical devices, display devices, imaging devices, and lighting devices are often used. These devices generally include a support system and a display screen, a camera, or a shadowless lamp. In the support system, an arbitrary hovering system such as a lifting arm is often used to adjust the position of these devices and achieve hovering at any position. The lifting arm is a balancing device that enables the display screen, camera, or shadowless lamp to hover at different heights. Traditional lifting arms use gas springs to achieve balance, but gas springs have a risk of air leakage, and the lifting arm may lose balance due to air leakage of the gas spring, affecting the reliability of the lifting arm. Currently, there are also some lifting arms that use mechanical springs to achieve balance, but these lifting arms have poor applicability to different loads and low versatility. Summary of the Invention

[0003] The purpose of this application is to provide a lifting arm to solve the technical problem in the prior art that the lifting arm has poor applicability to different loads and low versatility.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] Provide a lifting arm, which includes:

[0006] A first connection seat for connecting an external base;

[0007] A second connection seat for connecting an external interaction device;

[0008] An upper support assembly, one end of the upper support assembly is rotatably connected to the first connection seat, and the other end of the upper support assembly is rotatably connected to the second connection seat;

[0009] A lower support assembly, one end of the lower support assembly is rotatably connected to the first connection seat, the other end of the lower support assembly is rotatably connected to the second connection seat, and the lower support assembly is located below the upper support assembly. The first connection seat, the upper support assembly, the second connection seat, and the lower support assembly form a parallelogram structure;

[0010] A connecting rod assembly, one end of the connecting rod assembly is slidably connected to the upper support assembly, the other end of the connecting rod assembly is rotatably connected to the first connection seat, and the rotation axis position of the connecting rod assembly with respect to the first connection seat is adjustable;

[0011] A spring, one end of the spring abuts against the connecting rod assembly, the other end of the spring abuts against one end of the upper support assembly close to the second connecting seat, and the position of the abutting point between the spring and the upper support assembly is adjustable.

[0012] On the one hand, by designing the first connecting seat, the upper support assembly, the second connecting seat and the lower support assembly into a parallelogram structure, when the first connecting seat is fixed, the height of the second connecting seat is variable, thereby realizing the lifting function of the lifting arm, and thus realizing the height adjustment of the interaction device; on the other hand, by arranging the connecting rod assembly and the spring, the second connecting seat of the lifting arm can be hovered. Further, the position of the rotation axis of the connecting rod assembly and the first connecting seat is designed to be adjustable. First, the original included angle between the length direction of the connecting rod assembly and the upper support assembly is adjustable. The larger the original included angle is, the stronger the bearing capacity of the second connecting seat during hovering is, and the smaller the original included angle is, the weaker the bearing capacity of the second connecting seat during hovering is; secondly, the original compression amount of the spring is adjustable. The larger the original compression amount is, the stronger the original rigidity of the spring is, and the stronger the bearing capacity of the second connecting seat during hovering is. The smaller the original compression amount is, the weaker the original rigidity of the spring is, and the weaker the bearing capacity of the second connecting seat during hovering is. Therefore, the design that the position of the rotation axis of the connecting rod assembly and the first connecting seat is adjustable enables the lifting arm to adapt to the use requirements of more different loads, enables the lifting arm to be used in matching with different loads, and effectively improves the versatility of the lifting arm.

[0013] As an implementation manner, the upper support assembly includes a support main body and a stiffness adjustment structure arranged at one end of the support main body close to the second connecting seat. The stiffness adjustment structure includes a stiffness adjustment lead screw and a stiffness adjustment slider. The stiffness adjustment lead screw is rotatably connected to the support main body, the stiffness adjustment slider is slidably connected to the support main body, the stiffness adjustment lead screw can drive the stiffness adjustment slider to slide along the length direction of the support main body, and one end of the spring away from the first connecting seat abuts against the stiffness adjustment slider.

[0014] By arranging the transmission-matched stiffness adjustment lead screw and the stiffness adjustment slider, and abutting the spring against the stiffness adjustment slider, the stiffness adjustment slider can slide relative to the support main body, thereby realizing the adjustment of the position of the abutting point between the spring and the upper support assembly, that is, the original compression amount of the spring is adjustable, and thus realizing the adjustment of the original rigidity and bearing capacity of the spring.

[0015] As an embodiment, the support body includes a guide tube, the stiffness adjustment structure is arranged in the guide tube, the spring is movably arranged in the guide tube, and one end of the connecting rod assembly is inserted into the guide tube and slidably connected to the guide tube.

[0016] By providing a hollow guide tube and arranging the stiffness adjustment structure, the spring and a part of the connecting rod assembly in the guide tube, on the one hand, the strength of the upper support assembly can be improved to adapt to the use scenario of a larger load, and on the other hand, the internal space of the support body can be fully utilized to make the overall structure of the upper support assembly more compact, which is conducive to the miniaturization of the lifting arm.

[0017] As an implementation manner, a transmission connecting piece is provided at one end of the stiffness adjustment screw rod close to the second connecting seat, and a first clearance hole is opened at the second connecting seat corresponding to the axis of the transmission connecting piece.

[0018] By providing the first clearance hole that can expose the transmission connection member, the user can pass an external jig through the first clearance hole and connect it to the transmission connection member, thereby driving the stiffness adjustment screw rod to adjust the original compression amount of the spring and change the original stiffness of the spring.

[0019] As an embodiment, the upper support assembly further comprises a first connecting plate, one end of the first connecting plate is fixedly connected to one end of the support body close to the first connecting seat, the other end of the first connecting plate is rotatably connected to the first connecting seat, and a first gap is provided between the support body and the first connecting seat;

[0020] The upper support assembly also includes a second connecting plate, one end of which is fixedly connected to one end of the support body close to the second connecting seat, the other end of the second connecting plate is rotatably connected to the second connecting seat, and a second gap is set between the support body and the second connecting seat.

[0021] By setting the first connecting plate and the second connecting plate, the first gap and the second gap are formed between the supporting body and the first connecting seat and the second connecting seat respectively, so that the first connecting seat and the second connecting seat can be provided with sufficient movement during the lifting process, avoiding interference between the first connecting seat, the second connecting seat and the supporting body, which is conducive to the lifting arm to achieve a larger lifting range.

[0022] As an implementation manner, the lifting arm further includes a housing disposed on the outer periphery of the upper support assembly and the lower support assembly. The first connecting seat includes a first seat body, a first slit shielding plate, and a first slit shielding block. The first slit shielding block is disposed at the upper end of the first seat body. One end of the first slit shielding plate is rotatably connected to the first seat body, and the other end of the first slit shielding plate is inserted between the housing and the lower support assembly.

[0023] The second connecting seat includes a second seat body, a second slit shielding plate, and a second slit shielding block. The second slit shielding block is disposed at the lower end of the second seat body. One end of the second slit shielding plate is rotatably connected to the second seat body, and the other end of the second slit shielding plate is inserted between the housing and the support main body.

[0024] By providing the first slit shielding plate, the first slit shielding block, the second slit shielding plate, and the second slit shielding block, the first gap and the second gap can be shielded, reducing the exposure of the first gap and the second gap, and improving the use safety and aesthetics of the lifting arm.

[0025] As an implementation manner, the lifting arm further includes a first rotating shaft, a second rotating shaft, a third rotating shaft, and a fourth rotating shaft. The upper support assembly is connected to the first connecting seat through two of the first rotating shafts, and the two first rotating shafts are spaced apart in the axial direction. The lower support assembly is connected to the first connecting seat through two of the second rotating shafts, and the two second rotating shafts are spaced apart in the axial direction. The interior of the first connecting seat forms a first assembly space. The upper support assembly is connected to the second connecting seat through two of the third rotating shafts, and the two third rotating shafts are spaced apart in the axial direction. The lower support assembly is connected to the second connecting seat through two of the fourth rotating shafts, and the two fourth rotating shafts are spaced apart in the axial direction. The interior of the second connecting seat forms a second assembly space.

[0026] Connecting with two axially spaced rotating shafts can prevent the rotating shafts from passing through the interiors of the first connecting seat and the second connecting seat, so that the first assembly space and the second assembly space have more sufficient space, which is beneficial to the layout of other structures and the improvement of structural compactness. In particular, it is beneficial to layout the rotational connection structure between the link assembly and the first connecting seat, thus facilitating the overall miniaturization of the lifting arm.

[0027] As an implementation manner, the rotation axis of the upper support assembly and the first connecting seat and the center line of the spring are in the same plane, or the rotation axis of the upper support assembly and the first connecting seat is above the center line of the spring.

[0028] When the rotation axis of the upper support assembly and the first connection seat and the center line of the spring are in the same plane, the acting force of the spring on the upper support assembly and the supporting force provided by the rotation axis to the upper support assembly are on the same straight line; when the rotation axis of the upper support assembly and the first connection seat is above the center line of the spring, an upward torque is formed between the acting force of the spring on the upper support assembly and the rotation axis. From one perspective, it is beneficial to improve the load-bearing capacity of the second connection seat during hovering. From another perspective, when the load remains unchanged, it is beneficial to reduce the stress of the spring during use, and thus beneficial to extend the service life of the spring.

[0029] As an implementation manner, the lifting arm further includes an angle adjustment structure disposed inside the first connection seat. The angle adjustment structure includes an angle adjustment screw rod and an angle adjustment slider. The angle adjustment screw rod is rotatably connected to the first connection seat, the angle adjustment slider is slidably connected to the first connection seat, the angle adjustment screw rod can drive the angle adjustment slider to slide inside the first connection seat, and the link assembly is rotatably connected to the angle adjustment slider.

[0030] By providing the transmission-matched angle adjustment screw rod and angle adjustment slider, and rotatably connecting the link assembly to the angle adjustment slider, the angle adjustment slider can slide relative to the first connection seat, thereby realizing the position adjustment of the rotation axis of the link assembly and the first connection seat, and thus realizing the adjustment of the original included angle and load-bearing capacity.

[0031] As an implementation manner, the angle adjustment slider slides relative to the first connection seat in the vertical direction or the horizontal direction.

[0032] When the angle adjustment slider slides downward in the vertical direction, the original included angle between the length direction of the link assembly and the upper support assembly becomes larger, and the load-bearing capacity of the second connection seat during hovering becomes stronger; when the angle adjustment slider slides upward in the vertical direction, the original included angle between the length direction of the link assembly and the upper support assembly becomes smaller, and the load-bearing capacity of the second connection seat during hovering becomes weaker. When the angle adjustment slider slides horizontally toward the side close to the second connection seat, the original included angle between the length direction of the link assembly and the upper support assembly becomes larger, and the load-bearing capacity of the second connection seat during hovering becomes stronger; when the angle adjustment slider slides horizontally away from the second connection seat, the original included angle between the length direction of the link assembly and the upper support assembly becomes smaller, and the load-bearing capacity of the second connection seat during hovering becomes weaker.

[0033] As an implementation manner, the link assembly includes a connecting rod, a connecting block, and a damping member. One end of the connecting rod is rotatably connected to the first connecting seat, the other end of the connecting rod is rotatably connected to the connecting block, the connecting block is slidably connected to the upper support assembly, the damping member is disposed on the periphery of the connecting block and is in frictional contact with the upper support assembly, and the spring abuts against the connecting block.

[0034] On the one hand, by providing the rotatably connected connecting rod and the connecting block, the connecting rod and the upper support assembly can achieve a combined connection of rotation and sliding, thereby avoiding interference between the link assembly and the upper support assembly during the movement of the parallelogram structure and ensuring the reliable execution of the lifting movement. On the other hand, by providing the damping member, the sliding friction force between the connecting block and the upper support assembly can be increased, thereby enhancing the bearing capacity of the second connecting seat when hovering to a certain extent.

[0035] As an implementation manner, the lower support assembly includes a lower support plate and a wire fixing clip. One end of the lower support plate is rotatably connected to the first connecting seat, the other end of the lower support plate is rotatably connected to the second connecting seat, the wire fixing clip is disposed on a side of the lower support plate away from the upper support assembly, and the wire fixing clip is used for fixing a cable.

[0036] By providing the wire fixing clip below the lower support plate, a wire routing channel is formed below the lower support plate, and the wire routing channel is located outside the parallelogram structure formed by the first connecting seat, the upper support assembly, the second connecting seat, and the lower support assembly. Therefore, the cable can be effectively isolated from the upper support assembly, making the routing of the cable easy and the layout regular, and at the same time, the cable can be prevented from being exposed outside the lifting arm, and overall, the risk of the cable being worn during lifting can be greatly reduced.

[0037] As an implementation manner, the link assembly is located inside the parallelogram structure formed by the first connecting seat, the upper support assembly, the second connecting seat, and the lower support assembly.

[0038] By disposing the link assembly inside the parallelogram, the internal space of the parallelogram can be fully utilized, thereby improving the compactness of the overall structure of the lifting arm and facilitating the miniaturization of the lifting arm.

[0039] As an implementation manner, the upper support assembly includes a support main body. The lifting arm further includes a first rotating shaft, a second rotating shaft, a third rotating shaft, and a fourth rotating shaft. The upper support assembly is connected to the first connecting seat through two of the first rotating shafts, and the two first rotating shafts are spaced apart in the axial direction. The lower support assembly is connected to the first connecting seat through two of the second rotating shafts, and the two second rotating shafts are spaced apart in the axial direction. The interior of the first connecting seat forms a first assembly space;

[0040] One end of the connecting rod assembly is inserted into the support main body, and the other end of the connecting rod assembly is connected to the first connecting seat through a hinge shaft, and the hinge shaft is located in the first assembly space.

[0041] By respectively arranging the two ends of the connecting rod assembly in the support main body and the first assembly space, on the one hand, the compactness of the lifting arm can be improved, which is beneficial to the miniaturization of the lifting arm. On the other hand, the connecting rod assembly can be located at the center position in the horizontal direction, thereby avoiding the formation of torque in the horizontal direction between the connecting rod assembly and the first connecting seat and the upper support assembly, thus improving the working balance and stability of the lifting arm.

[0042] The beneficial effects of the lifting arm provided by this application are as follows:

[0043] On the one hand, by designing the first connecting seat, the upper support assembly, the second connecting seat, and the lower support assembly into a parallelogram structure, when the first connecting seat is fixed, the height of the second connecting seat can be changed, thereby realizing the lifting function of the lifting arm and further realizing the height adjustment of the interaction device. On the other hand, by arranging the connecting rod assembly and the spring, the second connecting seat of the lifting arm can achieve hovering. Further, the position of the rotation axis of the connecting rod assembly and the first connecting seat is designed to be adjustable. First, the original included angle between the length direction of the connecting rod assembly and the upper support assembly is adjustable. The larger the original included angle, the stronger the bearing capacity of the second connecting seat when hovering, and the smaller the original included angle, the weaker the bearing capacity of the second connecting seat when hovering. Secondly, the original compression amount of the spring is adjustable. The larger the original compression amount, the stronger the original rigidity of the spring, and the stronger the bearing capacity of the second connecting seat when hovering. The smaller the original compression amount, the weaker the original rigidity of the spring, and the weaker the bearing capacity of the second connecting seat when hovering. Therefore, the design of the adjustable position of the rotation axis of the connecting rod assembly and the first connecting seat enables the lifting arm to adapt to the use requirements of more different loads, enables the lifting arm to be used in combination with different loads, and effectively improves the versatility of the lifting arm. Description of the Drawings

[0044] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0045] Figure 1 Schematic diagram of the lifting arm provided by the embodiment of the present application;

[0046] Figure 2 Cross-sectional view of the lifting arm provided by the embodiment of the present application;

[0047] Figure 3 Schematic diagram of the lifting arm provided by the embodiment of the present application (the housing is not shown);

[0048] Figure 4 Cross-sectional view of the lifting arm in the first state provided by the embodiment of the present application;

[0049] Figure 5 For Figure 4 Partial enlarged view of the position A shown;

[0050] Figure 6 For Figure 4 Partial enlarged view of the position B shown;

[0051] Figure 7 Cross-sectional view of the lifting arm in the second state provided by the embodiment of the present application;

[0052] Figure 8 For Figure 7 Partial enlarged view of the position C shown;

[0053] Figure 9 For Figure 7 Partial enlarged view of the position D shown;

[0054] Figure 10 Schematic diagram of the second slot-blocking piece provided by the embodiment of the present application;

[0055] Figure 11 Force-bearing schematic diagram of the upper support assembly provided by the embodiment of the present application.

[0056] Among them, the reference numerals in the figure:

[0057] 1. First connection seat; 11. First seat body; 12. First slot-blocking plate; 13. First slot-blocking piece; 14. First assembly space; 15. Second relief hole;

[0058] 2. Second connecting seat; 21. Second seat body; 22. Second slot-sealing plate; 23. Second slot-sealing block; 231. First wire routing hole; 232. Second wire routing hole; 24. Second assembly space; 25. First relief hole;

[0059] 3. Upper support assembly; 31. Support main body; 32. Stiffness adjustment structure; 321. Stiffness adjustment screw rod; 322. Stiffness adjustment slider; 323. Stiffness adjustment support; 324. Transmission connecting piece; 33. First connecting plate; 34. Second connecting plate;

[0060] 4. Lower support assembly; 41. Lower support plate; 42. Wire fixing clip;

[0061] 5. Link assembly; 51. Connecting rod; 52. Connecting block; 53. Damping member;

[0062] 6. Spring;

[0063] 7. Outer shell;

[0064] 81. First rotating shaft; 82. Second rotating shaft; 83. Third rotating shaft; 84. Fourth rotating shaft;

[0065] 9. Angle adjustment structure; 91. Angle adjustment screw rod; 92. Angle adjustment slider; 93. Hinge shaft;

[0066] 100. Cable. Detailed implementation manners

[0067] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0068] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0069] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application 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 should not be construed as a limitation to the present application.

[0070] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0071] An embodiment of this application provides a lifting arm, as Figures 1 to 3 shown. The lifting arm includes a first connecting seat 1, a second connecting seat 2, an upper support assembly 3, a lower support assembly 4, a connecting rod assembly 5, and a spring 6. The first connecting seat 1 is used to connect an external base, and the second connecting seat 2 is used to connect an external interaction device. One end of the upper support assembly 3 is rotatably connected to the first connecting seat 1, and the other end of the upper support assembly 3 is rotatably connected to the second connecting seat 2; one end of the lower support assembly 4 is rotatably connected to the first connecting seat 1, and the other end of the lower support assembly 4 is rotatably connected to the second connecting seat 2, and the lower support assembly 4 is located below the upper support assembly 3. The first connecting seat 1, the upper support assembly 3, the second connecting seat 2, and the lower support assembly 4 form a parallelogram structure; one end of the connecting rod assembly 5 is slidably connected to the upper support assembly 3, and the other end of the connecting rod assembly 5 is rotatably connected to the first connecting seat 1, and the position of the rotation axis of the connecting rod assembly 5 and the first connecting seat 1 is adjustable; one end of the spring 6 abuts against the connecting rod assembly 5, and the other end of the spring 6 abuts against one end of the upper support assembly 3 close to the second connecting seat 2, and the abutting point position of the spring 6 and the upper support assembly 3 is adjustable.

[0072] On the one hand, by designing the first connecting seat 1, the upper support assembly 3, the second connecting seat 2, and the lower support assembly 4 into a parallelogram structure, when the first connecting seat 1 is fixed, the height of the second connecting seat 2 can be changed, thereby realizing the lifting function of the lifting arm and further realizing the height adjustment of the interaction device; on the other hand, by arranging the connecting rod assembly 5 and the spring 6, the second connecting seat 2 of the lifting arm can achieve hovering. Further, the position of the rotation axis of the connecting rod assembly 5 and the first connecting seat 1 is designed to be adjustable. First, the original included angle between the connecting rod assembly 5 and the length direction of the upper support assembly 3 is adjustable. The larger the original included angle, the stronger the bearing capacity of the second connecting seat 2 during hovering, and the smaller the original included angle, the weaker the bearing capacity of the second connecting seat 2 during hovering; second, the original compression amount of the spring 6 is adjustable. The larger the original compression amount, the stronger the original rigidity of the spring 6, and the stronger the bearing capacity of the second connecting seat 2 during hovering, and the smaller the original compression amount, the weaker the original rigidity of the spring 6, and the weaker the bearing capacity of the second connecting seat 2 during hovering. Therefore, the above design of the adjustable position of the rotation axis of the connecting rod assembly 5 and the first connecting seat 1 enables the lifting arm to adapt to the usage requirements of more different loads, enables the lifting arm to be used in matching with different loads, and effectively improves the versatility of the lifting arm.

[0073] During actual use, such as Figure 4 shown, it can be defined that when the upper support component 3 is in a horizontal state, the angle Y between the length direction of the connecting rod component 5 and the upper support component 3 is the original angle, and the compression amount X of the spring 6 is the original compression amount. Of course, it can also be defined that the angles and compression amounts in other states are the original angles and original compression amounts.

[0074] Such as Figure 11 shown, taking the upper support component 3 as the object of force analysis, the upper support component 3 is subjected to the acting force G of the external load, the supporting force F1 of the connecting rod component 5, and the supporting force F2 of the first connecting seat 1. In the hovering state, that is, in the state of static equilibrium, M(G) = M(F1) + M(F2). Since there is the supporting force F2 of the first connecting seat 1 along the length direction of the upper support component 3, and the supporting force F2 of the first connecting seat 1 can be large enough, therefore, the magnitude of the component force F12 of the supporting force F1 of the connecting rod component 5 along the length direction of the upper support component 3 has little influence on the bearing capacity of the second connecting seat 2. On the contrary, the magnitude of the component force F11 of the supporting force F1 of the connecting rod component 5 perpendicular to the length direction of the upper support component 3 plays an important role in the bearing capacity of the second connecting seat 2. That is, the larger the component force F11 of the supporting force F1 of the connecting rod component 5 perpendicular to the length direction of the upper support component 3, the greater the bearing capacity of the second connecting seat 2. Further, when the supporting force F1 of the connecting rod component 5 remains unchanged, the larger the original angle, the larger the component force F11 of the supporting force F1 of the connecting rod component 5 perpendicular to the length direction of the upper support component 3. Therefore, by adjusting the original angle, the bearing capacity of the first connecting seat 1 can be adjusted, and the larger the original angle, the stronger the bearing capacity of the second connecting seat 2 when hovering, and the smaller the original angle, the weaker the bearing capacity of the second connecting seat 2 when hovering.

[0075] In the specific implementation process, the interaction device can be any one or more of a display screen, a camera, an optical navigation system, a structured light camera, a shadowless lamp, etc.

[0076] Specifically, during the process of adjusting the height of the second connecting seat 2, the angle between the length direction of the connecting rod component 5 and the upper support component 3 will change. If the original angle is adjusted larger, then at any height position, the angle between the length direction of the connecting rod component 5 and the upper support component 3 will be larger. If the original angle is adjusted smaller, then at any height position, the angle between the length direction of the connecting rod component 5 and the upper support component 3 will be smaller. Therefore, adjusting the original angle can enable the lifting arm to match different load requirements.

[0077] Specifically, during the process of adjusting the height of the second connecting seat 2, the compression amount of the spring 6 will change. If the original compression amount is increased, then at any height position, the compression amount of the spring 6 will be greater and the rigidity will also be stronger. If the original compression amount is decreased, then at any height position, the compression amount of the spring 6 will be smaller and the rigidity will also be weaker. Therefore, adjusting the original compression amount can enable the lifting arm to match different load requirements.

[0078] In one embodiment, as Figure 2 and Figure 3 shown, the upper support assembly 3 includes a support main body 31 and a stiffness adjustment structure 32 provided at one end of the support main body 31 close to the second connecting seat 2. The stiffness adjustment structure 32 includes a stiffness adjustment screw rod 321 and a stiffness adjustment slider 322. The stiffness adjustment screw rod 321 is rotatably connected to the support main body 31, and the stiffness adjustment slider 322 is slidably connected to the support main body 31. The stiffness adjustment screw rod 321 can drive the stiffness adjustment slider 322 to slide along the length direction of the support main body 31. One end of the spring 6 away from the first connecting seat 1 abuts against the stiffness adjustment slider 322.

[0079] By providing the transmission - cooperating stiffness adjustment screw rod 321 and stiffness adjustment slider 322, and abutting the spring 6 against the stiffness adjustment slider 322, the stiffness adjustment slider 322 can slide relative to the support main body 31, thereby realizing the adjustment of the abutting point position between the spring 6 and the upper support assembly 3, that is, the original compression amount of the spring 6 is adjustable, so as to realize the adjustment of the original rigidity and bearing capacity of the spring 6.

[0080] In the specific implementation process, the stiffness adjustment screw rod 321 extends along the length direction of the support main body 31, and the stiffness adjustment slider 322 is slidably connected to the support main body 31 along the length direction of the support main body 31. The stiffness adjustment screw rod 321 is in threaded transmission connection with the stiffness adjustment slider 322. The spring 6 abuts against one end of the stiffness adjustment slider 322 away from the second connecting seat 2.

[0081] In the specific implementation process, the upper support assembly 3 further includes a stiffness adjustment support 323. The stiffness adjustment support 323 is arranged inside the support main body 31, and the stiffness adjustment screw rod 321 is rotatably arranged on the stiffness adjustment support 323.

[0082] In one embodiment, as Figure 2 and Figure 3 shown, the support main body 31 includes a guide tube. The stiffness adjustment structure 32 is arranged inside the guide tube. The spring 6 is movably arranged inside the guide tube. One end of the link assembly 5 is inserted into the guide tube and is slidably connected to the guide tube.

[0083] By setting a hollow guide tube and arranging the stiffness adjustment structure 32, the spring 6 and the local link assembly 5 inside the guide tube, on the one hand, the strength of the upper support assembly 3 can be improved to adapt to the usage scenarios with larger loads, and on the other hand, the internal space of the support main body 31 can be fully utilized, making the overall structure of the upper support assembly 3 more compact, and thus facilitating the miniaturization of the lifting arm.

[0084] In the specific implementation process, the stiffness adjustment support 323 is arranged inside the guide tube, the stiffness adjustment slider 322 is slidably connected to the inner wall of the guide tube, the connecting block 52 is slidably connected to the inner wall of the guide tube, the axis of the stiffness adjustment screw rod 321 overlaps with the axis of the guide tube, and the central axis of the spring 6 overlaps with the axis of the guide tube.

[0085] Certainly, in other embodiments, the support main body 31 can also be a guide rod, the stiffness adjustment structure 32 is arranged at the end of the guide rod, the spring 6 is movably sleeved on the periphery of the guide rod, and one end of the link assembly 5 is sleeved on the periphery of the guide rod and is slidably connected to the guide rod. This design can fully utilize the internal space of the spring 6, making the overall structure of the upper support assembly 3 more compact, and thus facilitating the miniaturization of the lifting arm.

[0086] In one embodiment, as Figure 4 、 Figure 5 、 Figure 7 and Figure 8 shown, a transmission connecting piece 324 is arranged at one end of the stiffness adjustment screw rod 321 close to the second connecting seat 2, and a first relief hole 25 is opened at the axis corresponding to the transmission connecting piece 324 on the second connecting seat 2, and the first relief hole 25 can expose the transmission connecting piece 324. By setting the first relief hole 25 that can expose the transmission connecting piece 324, the user can penetrate an external jig through the first relief hole 25 and be in transmission connection with the transmission connecting piece 324, and then can drive the stiffness adjustment screw rod 321, so as to adjust the original compression amount of the spring 6. In the specific implementation process, the transmission connecting piece 324 is a hole or a shaft.

[0087] In one embodiment, as Figure 3 shown, the upper support assembly 3 further includes a first connecting plate 33. One end of the first connecting plate 33 is fixedly connected to one end of the support main body 31 close to the first connecting seat 1, the other end of the first connecting plate 33 is rotatably connected to the first connecting seat 1, and a first gap is arranged between the support main body 31 and the first connecting seat 1; the upper support assembly 3 further includes a second connecting plate 34. One end of the second connecting plate 34 is fixedly connected to one end of the support main body 31 close to the second connecting seat 2, the other end of the second connecting plate 34 is rotatably connected to the second connecting seat 2, and a second gap is arranged between the support main body 31 and the second connecting seat 2.

[0088] By providing the first connecting plate 33 and the second connecting plate 34, a first gap and a second gap are formed between the supporting body 31 and the first connecting seat 1 and the second connecting seat 2 respectively, so that sufficient movement can be provided to the first connecting seat 1 and the second connecting seat 2 during the lifting process, avoiding interference between the first connecting seat 1 and the second connecting seat 2 and the supporting body 31, thereby facilitating the lifting arm to achieve a larger lifting range.

[0089] In the specific implementation process, the number of first connecting plates 33 is two, one ends of the two first connecting plates 33 are respectively fixedly connected to the opposite sides of one end of the support body 31 close to the first connecting seat 1, and the other ends of the two first connecting plates 33 are respectively rotatably connected to the first connecting seat 1; the number of second connecting plates 34 is two, one ends of the two second connecting plates 34 are respectively fixedly connected to the opposite sides of one end of the support body 31 close to the second connecting seat 2, and the other ends of the two second connecting plates 34 are respectively rotatably connected to the second connecting seat 2.

[0090] In one embodiment, if Figures 4 to 9 As shown, the lifting arm also includes a shell 7, which is arranged on the periphery of the upper support assembly 3 and the lower support assembly 4, the first connecting seat 1 includes a first seat body 11, a first slit-covering plate 12 and a first slit-covering block 13, the first slit-covering block 13 is arranged at the upper end of the first seat body 11, one end of the first slit-covering plate 12 is rotatably connected to the first seat body 11, and the other end of the first slit-covering plate 12 is inserted between the shell 7 and the lower support assembly 4; the second connecting seat 2 includes a second seat body 21, a second slit-covering plate 22 and a second slit-covering block 23, the second slit-covering block 23 is arranged at the lower end of the second seat body 21, one end of the second slit-covering plate 22 is rotatably connected to the second seat body 21, and the other end of the second slit-covering plate 22 is inserted between the shell 7 and the support body 31.

[0091] By providing the first gap-shielding plate 12, the first gap-shielding block 13, the second gap-shielding plate 22 and the second gap-shielding block 23, the first gap and the second gap can be shielded, so that the first gap and the second gap are less exposed, and the safety and aesthetics of the lifting arm can be improved.

[0092] In the specific implementation process, the first slit shielding plate 12 and the second slit shielding plate 22 are elastic plates. The first slit shielding plate 12 is slidably connected to the housing 7 at one end away from the first connection seat 1, and the second slit shielding plate 22 is slidably connected to the housing 7 at one end away from the second connection seat 2.

[0093] In one embodiment, if Figure 3 , Figure 5 , Figure 6 , Figure 8 and Figure 9As shown in the figure, the lifting arm further includes a first rotating shaft 81, a second rotating shaft 82, a third rotating shaft 83, and a fourth rotating shaft 84. The upper support assembly 3 is connected to the first connecting seat 1 through two first rotating shafts 81, and the two first rotating shafts 81 are spaced apart in the axial direction. The lower support assembly 4 is connected to the first connecting seat 1 through two second rotating shafts 82, and the two second rotating shafts 82 are spaced apart in the axial direction. The interior of the first connecting seat 1 forms a first assembly space 14. The upper support assembly 3 is connected to the second connecting seat 2 through two third rotating shafts 83, and the two third rotating shafts 83 are spaced apart in the axial direction. The lower support assembly 4 is connected to the second connecting seat 2 through two fourth rotating shafts 84, and the two fourth rotating shafts 84 are spaced apart in the axial direction. The interior of the second connecting seat 2 forms a second assembly space 24.

[0094] Connecting with two axially spaced rotating shafts can prevent the rotating shafts from passing through the interiors of the first connecting seat 1 and the second connecting seat 2, thereby enabling the first assembly space 14 and the second assembly space 24 to have more sufficient space, which is beneficial to the layout of other structures and the improvement of structural compactness. In particular, it is beneficial to the layout of the rotational connection structure between the link assembly 5 and the first connecting seat 1, thus facilitating the overall miniaturization of the lifting arm.

[0095] In one embodiment, as Figure 2 shown, the link assembly 5 is located inside the parallelogram structure formed by the first connecting seat 1, the upper support assembly 3, the second connecting seat 2, and the lower support assembly 4. By arranging the link assembly 5 inside the parallelogram, the internal space of the parallelogram can be fully utilized, thereby improving the overall structural compactness of the lifting arm and facilitating the miniaturization of the lifting arm.

[0096] In the specific implementation process, as Figure 2 、 Figure 6 and Figure 9 shown, the upper support assembly 3 includes a support main body 31. The lifting arm further includes a first rotating shaft 81, a second rotating shaft 82, a third rotating shaft 83, and a fourth rotating shaft 84. The upper support assembly 3 is connected to the first connecting seat 1 through two first rotating shafts 81, and the two first rotating shafts 81 are spaced apart in the axial direction. The lower support assembly 4 is connected to the first connecting seat 1 through two second rotating shafts 82, and the two second rotating shafts 82 are spaced apart in the axial direction. The interior of the first connecting seat 1 forms a first assembly space 14. One end of the link assembly 5 is inserted into the support main body 31, and the other end of the link assembly 5 is connected to the first connecting seat 1 through a hinge shaft 93, and the hinge shaft 93 is located in the first assembly space 14.

[0097] By respectively arranging the two ends of the connecting rod assembly 5 in the supporting body 31 and the first assembly space 14, on the one hand, the compactness of the lifting arm can be improved, which is conducive to the miniaturization of the lifting arm. On the other hand, the connecting rod assembly 5 can be located in a centered position in the horizontal direction, thereby avoiding the formation of torque in the horizontal direction between the connecting rod assembly 5 and the first connecting seat 1 and the upper support assembly 3, thereby improving the working balance and stability of the lifting arm.

[0098] In one embodiment, if Figure 3 , Figure 6 and Figure 9 As shown, the first connection seat 1 is provided with a second clearance hole 15, and the second clearance hole 15 is connected to the first assembly space 14. The cable 100 changes its routing direction in the first assembly space 14. During the process of threading the cable 100, the cable 100 is prone to get stuck in the first assembly space 14. By providing the second clearance hole 15 connected to the first assembly space 14, the user can move the cable 100 through the second clearance hole 15 when necessary during the assembly process to assist the cable 100 in changing its routing direction, thereby improving the efficiency of threading the cable 100.

[0099] In one embodiment, the rotation axis of the upper support assembly 3 and the first connection seat 1 and the center line of the spring 6 are located in the same plane, or the rotation axis of the upper support assembly 3 and the first connection seat 1 are located above the center line of the spring 6. When the rotation axis of the upper support assembly 3 and the first connection seat 1 and the center line of the spring 6 are located in the same plane, the force of the spring 6 acting on the upper support assembly 3 and the supporting force provided by the rotation axis to the upper support assembly 3 are in the same straight line; when the rotation axis of the upper support assembly 3 and the first connection seat 1 are located above the center line of the spring 6, an upward torque is formed between the force of the spring 6 acting on the upper support assembly 3 and the rotation axis. From one perspective, it is beneficial to improve the load-bearing capacity of the second connection seat 2 when it is suspended. From another perspective, it is beneficial to reduce the stress of the spring 6 during use when the load remains unchanged, thereby helping to extend the service life of the spring 6.

[0100] In one embodiment, if Figure 6 and Figure 9 As shown, the lifting arm also includes an angle adjustment structure 9 arranged inside the first connecting seat 1, and the angle adjustment structure 9 includes an angle adjustment screw rod 91 and an angle adjustment slider 92. The angle adjustment screw rod is rotatably connected to the first connecting seat 1, and the angle adjustment slider 92 is slidably connected to the first connecting seat 1. The angle adjustment screw rod 91 can drive the angle adjustment slider 92 to slide in the first connecting seat 1, and the connecting rod assembly 5 is rotatably connected to the angle adjustment slider 92.

[0101] By setting the angle-adjusting lead screw 91 and the angle-adjusting slider 92 in transmission cooperation, and rotatably connecting the link assembly 5 to the angle-adjusting slider 92, the angle-adjusting slider 92 can slide relative to the first connecting seat 1, thereby realizing the adjustment of the position of the rotation axis of the link assembly 5 and the first connecting seat 1, and thus realizing the adjustment of the original included angle and the bearing capacity.

[0102] In the specific implementation process, the angle-adjusting structure 9 is arranged in the first assembly space 14. The angle-adjusting lead screw 91 is in threaded transmission connection with the angle-adjusting slider 92, and the link assembly 5 is connected to one end of the angle-adjusting slider 92 away from the angle-adjusting lead screw 91.

[0103] In one embodiment, as Figure 4 、 Figure 6 、 Figure 7 and Figure 9 shown, the angle-adjusting slider 92 slides relative to the first connecting seat 1 in the vertical direction or the horizontal direction. When the angle-adjusting slider 92 slides downward in the vertical direction, the original included angle between the link assembly 5 and the length direction of the upper support assembly 3 becomes larger, and the bearing capacity when the second connecting seat 2 hovers becomes stronger; when the angle-adjusting slider 92 slides upward in the vertical direction, the original included angle between the link assembly 5 and the length direction of the upper support assembly 3 becomes smaller, and the bearing capacity when the second connecting seat 2 hovers becomes weaker. When the angle-adjusting slider 92 slides horizontally toward the side close to the second connecting seat 2, the original included angle between the link assembly 5 and the length direction of the upper support assembly 3 becomes larger, and the bearing capacity when the second connecting seat 2 hovers becomes stronger; when the angle-adjusting slider 92 slides horizontally away from the second connecting seat 2, the original included angle between the link assembly 5 and the length direction of the upper support assembly 3 becomes smaller, and the bearing capacity when the second connecting seat 2 hovers becomes weaker.

[0104] In the specific implementation process, as Figure 6 and Figure 9 shown, the angle-adjusting lead screw 91 extends in the vertical direction, the angle-adjusting slider 92 is slidably connected to the first connecting seat 1 in the vertical direction, and the angle-adjusting slider 92 is sleeved on the circumference of the angle-adjusting lead screw 91. Of course, in other embodiments, it can also be designed that the angle-adjusting lead screw 91 extends in the horizontal direction perpendicular to the rotation axis of the link assembly 5 and the first connecting seat 1, the angle-adjusting slider 92 is slidably connected to the first connecting seat 1 in the horizontal direction, and the angle-adjusting slider 92 is sleeved on the circumference of the angle-adjusting lead screw 91.

[0105] In one embodiment, as Figure 2As shown, the connecting rod assembly 5 includes a connecting rod 51, a connecting block 52, and a damping member 53. One end of the connecting rod 51 is rotatably connected to the first connecting seat 1, the other end of the connecting rod 51 is rotatably connected to the connecting block 52, the connecting block 52 is slidably connected to the upper support assembly 3, the damping member 53 is disposed on the periphery of the connecting block 52 and is in frictional contact with the upper support assembly 3, and the spring 6 abuts against the connecting block 52.

[0106] On the one hand, by providing the rotatably connected connecting rod 51 and connecting block 52, the connecting rod 51 and the upper support assembly 3 can achieve a combined connection of rotation and sliding, thereby avoiding interference between the connecting rod assembly 5 and the upper support assembly 3 during the movement of the parallelogram structure and ensuring the reliable execution of the lifting movement. On the other hand, by providing the damping member 53, the sliding friction force between the connecting block 52 and the upper support assembly 3 can be increased, and thus the bearing capacity when the second connecting seat 2 hovers can be enhanced to a certain extent.

[0107] Furthermore, as Figure 11 shown, when the second connecting seat 2 rises dynamically in balance, define the user's operating force as F3, define the friction force between the connecting block 52 and the upper support assembly 3 as f, then M(F3) = M(G) + M(f) - M(F1) - M(F2); when the second connecting seat 2 descends dynamically in balance, define the user's operating force as F4, define the friction force between the connecting block 52 and the upper support assembly 3 as f, then M(F4) = M(f) + M(F1) + M(F2) - M(G). Theoretically, although as long as the friction force between the connecting block 52 and the upper support assembly 3 is large enough, the second connecting seat 2 can have a large bearing capacity when hovering, but since the friction force will affect the operating force required by the user to adjust the height position of the second connecting seat 2, specifically, according to the above analysis, the larger the friction force f between the connecting block 52 and the upper support assembly 3, the greater the user's operating force. Therefore, if the friction force is too large, the operating force required by the user to adjust the height position of the second connecting seat 2 will be large. Especially when adjusting the height position of the second connecting seat 2 upward, the user needs to overcome the gravity of the load and the friction force at the same time, which will make it difficult to operate the height adjustment of the lifting arm and affect the user's experience of adjusting the height of the lifting arm. Therefore, in this application, the friction force is controlled within a certain range, and the spring 6 is used to make up for the lack of bearing capacity caused by insufficient friction force, so that the lifting arm has a large bearing capacity when hovering, and at the same time, the operating force required by the user to adjust the height position of the second connecting seat 2 can be reduced, making the user's operation easier and greatly improving the user's operation experience.

[0108] In a specific implementation process, the damping member 53 is a sealing ring, and the spring 6 abuts against one end of the connecting block 52 away from the connecting rod 51.

[0109] In one embodiment, as Figure 3As shown in the figure, the lower support assembly 4 includes a lower support plate 41 and a wire fixing clip 42. One end of the lower support plate 41 is rotatably connected to the first connecting seat 1, and the other end of the lower support plate 41 is rotatably connected to the second connecting seat 2. The wire fixing clip 42 is arranged on the side of the lower support plate 41 away from the upper support assembly 3, and the wire fixing clip 42 is used to fix the cable 100. By arranging the wire fixing clip 42 below the lower support plate 41, a wire routing channel is formed below the lower support plate 41, and this wire routing channel is located outside the parallelogram structure formed by the first connecting seat 1, the upper support assembly 3, the second connecting seat 2, and the lower support assembly 4. Thus, it can not only effectively isolate the cable 100 from the upper support assembly 3, making the routing of the cable 100 easy and the layout regular, but also avoid the cable 100 being exposed outside the lifting arm. Overall, it can greatly reduce the risk of the cable 100 being worn during the lifting process.

[0110] In the specific implementation process, as Figure 5 , Figure 8 and Figure 10 shown, the second seam-blocking piece 23 is provided with a first wire routing hole 231 and a second wire routing hole 232. The first wire routing hole 231 and the second wire routing hole 232 are communicated, and the first wire routing hole 231 is communicated with the wire routing channel. The cable 100 in the wire routing channel can pass through the first wire routing hole 231 and the second wire routing hole 232. This design enables the cable 100 to conveniently extend out of the wire routing channel and be electrically connected to the external structure.

[0111] The embodiment also provides an interaction device, which includes a base, an interaction device, and the above-mentioned lifting arm. The lifting arm is installed on the base, and the interaction device is installed at one end of the lifting arm away from the base. The lifting arm enables the interaction device to hover at different heights, and no locking operation is required during the height adjustment process, effectively improving the convenience of height adjustment of the interaction device.

[0112] In the specific implementation process, the interaction device can be any one or more of a display screen, a camera, a shadowless lamp, etc. The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lifting arm, characterized in that, Comprising: A first connecting seat (1) for connecting an external base; A second connecting seat (2) for connecting an external interaction device; An upper support assembly (3), one end of the upper support assembly (3) is rotatably connected to the first connecting seat (1), and the other end of the upper support assembly (3) is rotatably connected to the second connecting seat (2); A lower support assembly (4), one end of the lower support assembly (4) is rotatably connected to the first connecting seat (1), and the other end of the lower support assembly (4) is rotatably connected to the second connecting seat (2), and the lower support assembly (4) is located below the upper support assembly (3), and the first connecting seat (1), the upper support assembly (3), the second connecting seat (2) and the lower support assembly (4) form a parallelogram structure; A link assembly (5), one end of the link assembly (5) is slidably connected to the upper support assembly (3), and the other end of the link assembly (5) is rotatably connected to the first connecting seat (1), and the rotational axis position of the link assembly (5) and the first connecting seat (1) is adjustable; A spring (6), one end of the spring (6) abuts against the link assembly (5), and the other end of the spring (6) abuts against one end of the upper support assembly (3) close to the second connecting seat (2), and the abutting point position of the spring (6) and the upper support assembly (3) is adjustable.

2. The lifting arm according to claim 1, wherein The upper support assembly (3) includes a support body (31) and a stiffness adjustment structure (32) provided at one end of the support body (31) close to the second connecting seat (2). The stiffness adjustment structure (32) includes a stiffness adjustment screw rod (321) and a stiffness adjustment slider (322). The stiffness adjustment screw rod (321) is rotatably connected to the support body (31), and the stiffness adjustment slider (322) is slidably connected to the support body (31). The stiffness adjustment screw rod (321) can drive the stiffness adjustment slider (322) to slide along the length direction of the support body (31), and one end of the spring (6) away from the first connecting seat (1) abuts against the stiffness adjustment slider (322).

3. The lifting arm according to claim 2, characterized in that, The support body (31) includes a guide tube, the stiffness adjustment structure (32) is arranged in the guide tube, the spring (6) is movably arranged in the guide tube, and one end of the link assembly (5) is inserted into the guide tube and is slidably connected to the guide tube.

4. The lifting arm according to claim 2, wherein A transmission connecting piece (324) is arranged at one end of the stiffness adjustment screw rod (321) close to the second connecting seat (2), and a first relief hole (25) is opened at the axis of the second connecting seat (2) corresponding to the transmission connecting piece (324).

5. The lifting arm according to claim 2, characterized in that, The upper support assembly (3) further includes a first connecting plate (33). One end of the first connecting plate (33) is fixedly connected to one end of the support body (31) close to the first connecting seat (1), and the other end of the first connecting plate (33) is rotatably connected to the first connecting seat (1). A first gap is provided between the support body (31) and the first connecting seat (1). The upper support assembly (3) further includes a second connecting plate (34). One end of the second connecting plate (34) is fixedly connected to one end of the support body (31) close to the second connecting seat (2), and the other end of the second connecting plate (34) is rotatably connected to the second connecting seat (2). A second gap is provided between the support body (31) and the second connecting seat (2).

6. The lifting arm according to claim 5, wherein The lifting arm further includes a housing (7). The housing (7) is arranged on the outer periphery of the upper support assembly (3) and the lower support assembly (4). The first connecting seat (1) includes a first seat body (11), a first slot-sealing plate (12) and a first slot-sealing block (13). The first slot-sealing block (13) is arranged at the upper end of the first seat body (11). One end of the first slot-sealing plate (12) is rotatably connected to the first seat body (11), and the other end of the first slot-sealing plate (12) is inserted between the housing (7) and the lower support assembly (4). The second connecting seat (2) includes a second seat body (21), a second slot-sealing plate (22) and a second slot-sealing block (23). The second slot-sealing block (23) is arranged at the lower end of the second seat body (21). One end of the second slot-sealing plate (22) is rotatably connected to the second seat body (21), and the other end of the second slot-sealing plate (22) is inserted between the housing (7) and the support body (31).

7. The lifting arm according to claim 1, characterized in that, The lifting arm further includes a first rotating shaft (81), a second rotating shaft (82), a third rotating shaft (83) and a fourth rotating shaft (84). The upper support assembly (3) is connected to the first connecting seat (1) through two of the first rotating shafts (81), and the two first rotating shafts (81) are arranged at intervals in the axial direction. The lower support assembly (4) is connected to the first connecting seat (1) through two of the second rotating shafts (82), and the two second rotating shafts (82) are arranged at intervals in the axial direction. The interior of the first connecting seat (1) forms a first assembly space (14). The upper support assembly (3) is connected to the second connecting seat (2) through two of the third rotating shafts (83), and the two third rotating shafts (83) are arranged at intervals in the axial direction. The lower support assembly (4) is connected to the second connecting seat (2) through two of the fourth rotating shafts (84), and the two fourth rotating shafts (84) are arranged at intervals in the axial direction. The interior of the second connecting seat (2) forms a second assembly space (24).

8. The lifting arm according to claim 1, wherein The rotation axis of the upper support assembly (3) and the first connection seat (1) and the center line of the spring (6) are located in the same plane, or the rotation axis of the upper support assembly (3) and the first connection seat (1) is located above the center line of the spring (6).

9. The lifting arm according to any one of claims 1 to 8, characterized in that, The lifting arm further includes an angle adjustment structure (9) disposed inside the first connection seat (1). The angle adjustment structure (9) includes an angle adjustment lead screw (91) and an angle adjustment slider (92). The angle adjustment lead screw (91) is rotatably connected to the first connection seat (1), the angle adjustment slider (92) is slidably connected to the first connection seat (1), the angle adjustment lead screw (91) can drive the angle adjustment slider (92) to slide inside the first connection seat (1), and the link assembly (5) is rotatably connected to the angle adjustment slider (92).

10. The lifting arm according to claim 9, characterized in that, The angle adjustment slider (92) slides relative to the first connection seat (1) in the vertical direction or the horizontal direction.

11. The lifting arm according to claim 1, characterized in that, The link assembly (5) includes a connecting rod (51), a connecting block (52), and a damping member (53). One end of the connecting rod (51) is rotatably connected to the first connection seat (1), the other end of the connecting rod (51) is rotatably connected to the connecting block (52), the connecting block (52) is slidably connected to the upper support assembly (3), the damping member (53) is disposed on the periphery of the connecting block (52) and is in frictional contact with the upper support assembly (3), and the spring (6) abuts against the connecting block (52).

12. The lifting arm according to claim 1, characterized in that, The lower support assembly (4) includes a lower support plate (41) and a wire fixing clip (42). One end of the lower support plate (41) is rotatably connected to the first connection seat (1), the other end of the lower support plate (41) is rotatably connected to the second connection seat (2), the wire fixing clip (42) is disposed on the side of the lower support plate (41) away from the upper support assembly (3), and the wire fixing clip (42) is used for fixing a cable (100).

13. The lifting arm according to claim 1, characterized in that, The link assembly (5) is located inside the parallelogram structure formed by the first connection seat (1), the upper support assembly (3), the second connection seat (2), and the lower support assembly (4).

14. The lifting arm according to claim 13, characterized in that, The upper support assembly (3) includes a support body (31). The lifting arm further includes a first rotating shaft (81), a second rotating shaft (82), a third rotating shaft (83), and a fourth rotating shaft (84). The upper support assembly (3) is connected to the first connection seat (1) through two of the first rotating shafts (81), and the two first rotating shafts (81) are spaced apart in the axial direction. The lower support assembly (4) is connected to the first connection seat (1) through two of the second rotating shafts (82), and the two second rotating shafts (82) are spaced apart in the axial direction. The inside of the first connection seat (1) forms a first assembly space (14). One end of the connecting rod assembly (5) is inserted into the support body (31), and the other end of the connecting rod assembly (5) is connected to the first connecting seat (1) through a hinge shaft (93), and the hinge shaft (93) is located in the first assembly space (14).

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