Adjusting mechanism and adjustable support

Abstract

According to the adjusting mechanism, a lifting module is arranged in a shell and comprises a moving unit capable of moving relative to the shell in the length direction of the shell and a mooring rope connected with the moving unit, and the mooring rope penetrates out of the shell to be connected with an external device to be lifted; the elastic module comprises at least one gas spring and at least one mechanical tension spring; in the length direction of the shell, the ends, facing the moving unit, of the gas spring and the mechanical tension spring are fixedly connected with the moving unit, and the ends, deviating from the moving unit, of the gas spring and the mechanical tension spring are connected with the shell. The moving unit at least has a first position and a second position, and a gas spring and a mechanical tension spring of the elastic module at least have a first state and a second state; when the gas spring and the mechanical tension spring are in a first state, the moving unit is located at a first position, and the to-be-lifted device is located at a to-be-lifted position; and when the gas spring and the mechanical tension spring are in the second state, the moving unit is located at the second position, and the to-be-lifted device is located at the to-be-descended position.

Description

Technical Field

[0001] The utility model relates to the technical field of brackets, in particular to an adjustment mechanism and an adjustable bracket. Background Art

[0002] Adjustable stands are widely used in modern office, home entertainment and commercial environments. For example, monitors, interactive machines, whiteboards and other devices can be adjusted using them. They provide users with flexibility, allowing users to adjust the height, angle and position of monitors, interactive machines, whiteboards and other devices as needed to improve viewing comfort and work efficiency.

[0003] Among them, the application of spring and damping mechanism in the adjustable bracket is mainly used to achieve smooth and stable angle adjustment, and to improve the user experience of using the adjustable bracket by providing auxiliary force. Mainly, the spring provides tension through elastic deformation to balance the weight of the display device.

[0004] However, the adjustment mechanism using a spring will produce metal fatigue during long-term use and frequent adjustment, gradually losing elasticity and restoring force. Spring fatigue causes the supporting capacity of the bracket to decrease, and the weight of the equipment placed on the bracket cannot be effectively balanced, the adjustment difficulty increases, and the service life is shortened. On the other hand, the existing adjustment mechanism using a spring does not provide gentle feedback to the user's force when in use. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the main purpose of the present invention is to provide an adjustment mechanism and an adjustable bracket to solve one or more of the above-mentioned existing problems.

[0006] The utility model provides an adjustment mechanism, comprising:

[0007] case;

[0008] A lifting module, the lifting module is arranged in the shell, the lifting module comprises a moving unit that can move relative to the shell along the length direction of the shell and a cable connected to the moving unit, the cable passes through the shell to connect to an external device to be lifted;

[0009] An elastic module, the elastic module comprising at least one gas spring and at least one mechanical tension spring; in the length direction of the shell, the ends of the gas spring and the mechanical tension spring facing the mobile unit are fixedly connected to the mobile unit, and the ends of the gas spring and the mechanical tension spring facing away from the mobile unit are connected to the shell; wherein,

[0010] The movable unit has at least a first position and a second position, and the gas spring and the mechanical tension spring included in the elastic module have at least a first state and a second state; when the gas spring and the mechanical tension spring are in the first state, the movable unit is located in the first position, and the device to be lifted is in the position to be lifted; when the gas spring and the mechanical tension spring are in the second state, the movable unit is located in the second position, and the device to be lifted is in the position to be lowered.

[0011] By means of the above structure, the utility model realizes precise adjustment of the external device to be lifted and lowered through the coordinated action of the lifting module and the elastic module in the adjustment mechanism. Specifically, when the gas spring and the mechanical tension spring are in the first state, the moving unit is in the first position, and the device to be lifted and lowered is in the state to be lifted and lowered; when the gas spring and the mechanical tension spring are in the second state, the moving unit is in the second position, and the device to be lifted and lowered is in the position to be lowered and lowered. The gas spring and the mechanical tension spring cooperate with each other, the gas spring provides supporting force, and the mechanical tension spring provides reverse tightening force, providing a linear weakening force for the gas spring, thereby making the force feedback softer and more uniform.

[0012] Furthermore, the side wall of the shell along its length direction is provided with a first rolling part, and the end surface of the mobile unit facing the side wall of the shell is provided with a second rolling part, and the first rolling part and the second rolling part are rolling-matched. The rolling match reduces the friction resistance, can be used for guiding and low-resistance positioning, and makes the system run more smoothly.

[0013] Furthermore, the elastic module also includes a guide rod extending along the length direction of the shell and an adjustment block sleeved on the guide rod; wherein,

[0014] One end of the mechanical tension spring away from the moving unit is connected to the adjustment block;

[0015] One end of the guide rod facing away from the adjustment block is connected to the shell; the guide rod can drive the adjustment block to adjust relative to the shell along the length direction of the shell.

[0016] Furthermore, the adjustment block includes a main body and a hanging part arranged on the main body, the mechanical tension spring is sleeved on the hanging part of the adjustment block, and a bolt is also installed between the hanging part port of the adjustment block and the main body;

[0017] A through groove is provided on the front wall or the rear wall of the shell along the thickness direction thereof, and the through groove extends along the length direction of the shell;

[0018] The bolt is accommodated in the through slot, and one end of the bolt facing away from the adjusting block does not protrude from the through slot.

[0019] Furthermore, the adjustment mechanism also includes a fixed pulley set arranged on the inner wall of the shell, and a movable pulley set connected to the mobile unit; the fixed pulley set includes at least one fixed pulley, and the movable pulley set includes at least one movable pulley, one end of the cable is connected to the external device to be lifted, and the other end of the cable is connected to the device to be lifted outside the shell after alternately passing through the fixed pulley and the movable pulley. The fixed pulley set is arranged on the inner wall of the shell, and the movable pulley set is arranged on the mobile unit to form an efficient pulley system. By utilizing the mechanical advantage of the pulley, not only the force required to pull the device to be lifted is significantly reduced, the operating efficiency is improved, but also the stability and durability of the system are increased, ensuring that the adjustment mechanism can achieve efficient, stable and labor-saving lifting operations in various application scenarios.

[0020] Furthermore, the fixed pulley assembly includes at least one first fixed pulley disposed on the side wall of the housing and at least one second fixed pulley disposed on the rear wall or the front wall of the housing, and the other end of the cable passes around the first fixed pulley, the movable pulley and the second fixed pulley. The reasonable layout of the pulley system makes the system structure more compact, and enhances the overall stability and reliability. The cables staggeredly pass through the first fixed pulley, the movable pulley and the second fixed pulley, and by optimizing the path of the cables passing through the pulley system, the cable wear and force loss are reduced, and the system efficiency is improved.

[0021] The utility model also provides an adjustable bracket, comprising the above-mentioned adjustment mechanism and a device to be lifted, wherein one end of the device to be lifted is connected to a cable passing through the housing of the adjustment mechanism, and the other end of the device to be lifted is rotatably connected to the housing of the adjustment mechanism. The adjustment mechanism controls the cable to pull the device to be lifted to achieve the lifting or lowering of the device to be lifted.

[0022] Furthermore, the device to be lifted includes a connecting arm and a bracket, wherein the two ends of the connecting arm are rotatably connected to the housing of the adjustment mechanism and the bracket, respectively. The rotatable connection of the connecting arm enables the entire adjustable bracket to have higher flexibility during operation and can better adapt to various lifting angles and directions.

[0023] Furthermore, one end of the bracket connected to the connecting arm is fixedly connected to the cable; or one end of the connecting arm connected to the bracket is fixedly connected to the cable. There are many ways to connect the cable to the device to be lifted.

[0024] Furthermore, it also includes a plurality of winding posts arranged on the connecting arm, and a pressure plate sleeved on the winding posts; the plurality of winding posts are used to wind the cable, and the end surfaces of the pressure plate and the connecting arm opposite to each other are used to clamp the cable. The pressure plate is used to press the rope head, the pressing force is uniform, the rope head has no extra retraction space, and the rope head pressing is safer and more reliable.

[0025] The beneficial effects of the utility model are:

[0026] (1) The combination of mechanical tension spring and gas spring makes the force feedback softer and more uniform, and enables the load within the preset range to hover at any position;

[0027] (2) The position of the adjustment block can be adjusted according to the load of the whole machine, thereby adjusting the prestress of the mechanical tension spring;

[0028] (3) The rolling cooperation between the first rolling part and the second rolling part can be used for guiding and low-resistance positioning, thereby reducing the friction of the system and making the system run more smoothly. The use of the movable pulley group achieves the effect of driving a larger load force with a smaller spring force, reduces the rigidity and strength requirements of the gas spring, and improves the durability of the system;

[0029] (4) The pressing plate is used to press the snake-shaped rope head. The pressing force is uniform and there is no extra retraction space for the rope head. The rope head pressing is safer and more reliable. The number of snake-shaped bends can be determined according to actual needs and can be flexibly changed according to system needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes and are used to help understand the present invention. They do not specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of the adjustable bracket of the utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the adjustment mechanism in the embodiment of the utility model;

[0033] Figure 3 This is a schematic diagram of the structure of the elastic module in the embodiment of the utility model;

[0034] Figure 4 It is a schematic diagram of the structure of the rolling cooperation between the first rolling part and the second rolling part in the embodiment of the utility model;

[0035] Figure 5 It is a schematic diagram of the connection between the adjustment block and the mechanical tension spring in the embodiment of the utility model;

[0036] Figure 6 It is a structural schematic diagram of a fixed pulley block and a fixed pulley block in an embodiment of the utility model;

[0037] Figure 7This is a schematic diagram of the structure in which the cable is fixedly connected to the connecting arm (excluding the pressure plate) in the embodiment of the utility model;

[0038] Figure 8 It is a schematic diagram of the structure of the fixed connection between the cable and the connecting arm (including the pressure plate) in the embodiment of the utility model.

[0039] In the figure: 1. shell; 11. first rolling part; 12. through groove; 2. lifting module; 21. moving unit; 211. second rolling part; 22. cable; 3. elastic module; 31. gas spring; 32. mechanical tension spring; 33. guide rod; 34. adjustment block; 341. bolt; 342. main body; 343. hanging part; 41. first fixed pulley; 42. second fixed pulley; 5. movable pulley block; 6. device to be lifted; 61. connecting arm; 611. winding column; 612. pressure plate; 62. bracket. DETAILED DESCRIPTION

[0040] The following will be combined with the attached embodiment of the utility model Figure 1-8 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.

[0041] In the description of the present utility model, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0042] See also Figures 1 to 8The present embodiment provides an adjustment mechanism, which includes a shell 1, a lifting module 2 and an elastic module 3. The lifting module 2 is installed inside the shell 1. The lifting module 2 includes a moving unit 21 that can move relative to the shell 1 along the length direction of the shell 1 and a cable 22 connected to the moving unit 21, and the cable 22 passes through the shell 1 and is connected to a to-be-lifted device 6 outside the shell 1; the elastic module 3 includes at least one gas spring 31 and at least one mechanical tension spring 32, the gas spring 31 and the mechanical tension spring 32 are both arranged in parallel along the length direction of the shell 1, one end of the gas spring 31 and the mechanical tension spring 32 is fixedly connected to the moving unit 21, and the other end of the gas spring 31 and the mechanical tension spring 32 away from the moving unit 21 is fixedly connected to the shell 1. The movable unit 21 has at least a first position and a second position, and the gas spring 31 and the mechanical tension spring 32 included in the elastic module 3 have at least a first state and a second state; when the gas spring 31 and the mechanical tension spring 32 are in the first state, the movable unit 21 is located in the first position, and the device to be lifted 6 is in the position to be lifted; when the gas spring 31 and the mechanical tension spring 32 are in the second state, the movable unit 21 is located in the second position, and the device to be lifted 6 is in the position to be lowered.

[0043] By means of the above structure, the lifting device 6 can be used to install objects such as display devices (hereinafter, the installation of display devices is taken as an example). The lifting device 6 is connected to a cable 22, and the cable 22 is also connected to the adjustment mechanism. Specifically, the cable 22 is connected to the mobile unit 21. When adjusting the position of the display device, the cable 22 pulls the mobile unit 21, and the mobile unit 21 moves along the length direction of the shell 1 inside the shell 1 of the adjustment mechanism. The gas spring 31 in the elastic module 3 applies a force opposite to the direction of its movement to the mobile unit 21 to prevent the mobile unit 21 from moving, and finally keeps the entire adjustment system balanced; the elastic module 3 also includes at least one mechanical tension spring 32, and the two ends of the mechanical tension spring 32 are respectively connected to the shell 1 and the mobile unit 21. Since the elastic force of the mechanical tension spring 32 is variable, when the mechanical tension spring 32 is in a stretched state, it can provide a linear weakening force for the gas spring 31, thereby giving the user a softer and more uniform force feedback.

[0044] Furthermore, when the gas spring 31 and the mechanical tension spring 32 are both in the first state, the moving unit 21 is in the first position, and the device to be lifted 6 is in the position to be lifted; when the gas spring 31 and the mechanical tension spring 32 are both in the second state, the moving unit 21 is in the second position, and the device to be lifted 6 is in the position to be lowered. It should be understood that the first state and the second state are actually two limit states of the adjustment mechanism. Under the action of the elastic module 3, the device to be lifted 6 can hover at any position between the first position and the second position to achieve a state of force balance; if the user needs to adjust the position of the device to be lifted 6 again, it is only necessary to apply external force to break the force balance.

[0045] Specifically, in this embodiment, the first position and the second position are defined as two extreme positions of the mobile unit 21, and the first state and the second state are positioned as two extreme states of the gas spring 31 and the mechanical tension spring 32, and the first position of the mobile unit 21 is higher than the second position. Therefore, when the gas spring 31 and the mechanical tension spring 32 are both in the first state, that is, the gas spring 31 and the mechanical tension spring 32 are both in the limit state of not being stretched (it should be understood that the mechanical tension spring 32 has prestress when in this state), they can be stretched, thereby driving the mobile unit 21 to move from the first position to the second position, so that the device to be lifted 6 rises accordingly; when the gas spring 31 and the mechanical tension spring 32 are both in the second state, that is, the gas spring 31 and the mechanical tension spring 32 are both in the limit state of stretching, thereby driving the mobile unit 21 to move from the second position to the first position, so that the device to be lifted 6 descends accordingly.

[0046] See also Figure 4 Specifically, in this embodiment, the side wall of the shell 1 is further provided with a first rolling part 11, and the second rolling parts 211 are installed on both sides of the mobile unit 21 facing the side wall of the shell 1. In the prior art, the mobile unit 21 and the shell are usually static friction sliding, which causes great loss to the machine itself. Specifically, in this embodiment, for example, the first rolling part 11 is a guide rail, which is installed on the side wall of the shell 1, and the second rolling part 211 is a roller, which is installed on both sides of the mobile unit 21. The rolling cooperation between the first rolling part 11 and the second rolling part 211 can achieve the purpose of guiding and low-resistance positioning, reduce the friction of the system, and make the system run more smoothly.

[0047] See also Figures 2 to 5 Specifically, in the present embodiment, the elastic module 3 further comprises a guide rod 33 arranged along the length direction of the shell 1 and an adjustment block 34 sleeved on the guide rod 33 and threadedly connected thereto. The end of the mechanical tension spring 32 away from the moving unit 21 is connected to the adjustment block 34, and the end of the guide rod 33 away from the adjustment block 34 is connected to the shell 1. Therefore, rotating the guide rod 33 can control the adjustment of the adjustment block 34 along the length direction of the shell 1, and then the prestress of the mechanical tension spring 32 can be synchronously adjusted: when the prestress of the mechanical tension spring 32 needs to be increased, the guide rod 33 is rotated to make the adjustment block 34 approach the upper end of the shell 1; when the prestress of the mechanical tension spring 32 needs to be reduced, the guide rod 33 is rotated in the opposite direction to make the adjustment block 34 relatively away from the upper end of the shell 1 by a preset distance.

[0048] Specifically, in the present embodiment, the adjustment block 34 includes a main body portion 342 and a hanging portion 343. The main body portion 342 is sleeved and fixed on the guide rod 33. The end of the mechanical tension spring 32 away from the movable unit 21 is in a ring shape and is directly sleeved on the hook-shaped hanging portion 343 of the adjustment block 34. A bolt 341 is also provided between the end of the hanging portion 343 and the main body portion 342. The bolt 341 passes through the hanging portion 343 and is connected to the main body portion 342, thereby effectively preventing the end of the mechanical tension spring 32 connected to the adjustment block 34 from escaping from the hanging portion 343. At the same time, the front wall of the housing 1 is also provided with a through slot 12 along its length direction, and the through slot 12 extends along the length direction of the housing 1, so that the bolt 341 can move inside, and the end of the bolt 341 away from the adjustment block 34 does not protrude from the through slot 12, which effectively prevents the protruding bolt 341 from supporting the device to be lifted 6 when the device to be lifted 6 overlaps with the adjustment mechanism, and causing damage to the surface of the device to be lifted 6 or interfering with other components outside the housing 1. Preferably, scale marks are set on one or both sides of the through slot 12 along the length direction of the housing 1, and the bolt 341 is equivalent to a scale mark pointer, which can facilitate users to clearly and real-time understand the prestressing size of the mechanical tension spring 32 indirectly adjusted through the guide rod 33.

[0049] See also Figure 2 and Figure 6 Specifically, in this embodiment, a fixed pulley block and a movable pulley block 5 are further provided inside the adjustment mechanism, the fixed pulley block includes at least one fixed pulley, the movable pulley block 5 includes at least one movable pulley, the fixed pulley block is divided into a first fixed pulley 41 and a second fixed pulley 42, the first fixed pulley 41 is mounted on the side wall of the housing 1, the second fixed pulley 42 is mounted on the rear wall of the housing 1, the movable pulley block 5 is mounted on the mobile unit 21, one end of the cable 22 is connected to the device to be lifted 6, and the other end passes through the first fixed pulley 41, the movable pulley block 5, the second fixed pulley 42, the first fixed pulley 41 in sequence, and finally connected back to the device to be lifted 6. The movable pulley block 5 and the second fixed pulley 42 are arranged alternately. Among them, the first fixed pulley 41 is used to change the direction of the cable 22, and the second fixed pulley 42 cooperates with the movable pulley group 5 to lift the mobile unit 21. At the same time, the pulling efficiency of the cable 22 is optimized, reducing the force required to lift the device to be lifted 6, which can significantly reduce energy consumption and operating costs. The reasonable layout and design of the fixed pulley group and the movable pulley group 5 enhance the overall structural stability of the adjustment mechanism and ensure reliable operation under various working conditions.

[0050] See also Figures 1 to 8Specifically, the present embodiment further provides an adjustable bracket, comprising the adjusting mechanism and the device to be lifted as described above, wherein one end of the device to be lifted 6 is connected to a cable 22 passing through the shell 1 of the adjusting mechanism, and the other end of the device to be lifted 6 is rotatably connected to the shell 1. When the cable 22 pulls the device to be lifted 6, the device to be lifted 6 can rotate around the connection between it and the shell 1.

[0051] See also Figure 1 Specifically, in this embodiment, the device to be lifted 6 includes a connecting arm 61 and a bracket 62, wherein both ends of the connecting arm 61 are rotatably connected to the housing 1 of the adjustment mechanism and the bracket 62, respectively. The cable 22 is connected to one end of the connecting arm 61 and the bracket 62 that are rotatably connected. Of course, in other embodiments, the cable 22 may also be connected to one end of the bracket 62 and the connecting arm 61 that are rotatably connected.

[0052] See also Figure 7 and Figure 8 Specifically, in this embodiment, the connecting arm 61 is provided with 2 groups of 6 winding posts 611 perpendicular to itself, and a pressure plate 612 that can be set on the winding posts 611. The two rope ends of the cable 22 passing through the housing are respectively wound on the two groups of winding posts 611 after passing from the upper side of the connecting arm to the lower side. The end surface of the connecting arm 61 opposite to the pressure plate 612 and the winding posts 611 is used to press the cable 22. The compressed rope end part of the cable 22 is bent like a snake. Finally, the pressure plate 612 is fixed by using a nut and the winding posts 611. Of course, in other embodiments, the winding posts 611 can also be set to other numbers, but the effectiveness of winding should be guaranteed. Generally, there are not less than 2 in one group. In the prior art, the method of fixing the cable 22 is to suppress it by using an aluminum buckle ring or the like. Compared with the prior art, this embodiment adopts a new rope head pressing method. By winding the cable 22 and providing a uniform pressing force by the pressure plate 612, the rope head has no additional retraction space, which improves the safety and reliability of rope head pressing.

[0053] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An adjustment mechanism, characterized in that: include: case; A lifting module, the lifting module is arranged in the shell, the lifting module comprises a moving unit that can move relative to the shell along the length direction of the shell and a cable connected to the moving unit, the cable passes through the shell to connect to an external device to be lifted; An elastic module, the elastic module comprising at least one gas spring and at least one mechanical tension spring; in the length direction of the shell, the ends of the gas spring and the mechanical tension spring facing the mobile unit are fixedly connected to the mobile unit, and the ends of the gas spring and the mechanical tension spring facing away from the mobile unit are connected to the shell; wherein, The movable unit has at least a first position and a second position, and the gas spring and the mechanical tension spring included in the elastic module have at least a first state and a second state; when the gas spring and the mechanical tension spring are in the first state, the movable unit is located in the first position, and the device to be lifted is in the position to be lifted; when the gas spring and the mechanical tension spring are in the second state, the movable unit is located in the second position, and the device to be lifted is in the position to be lowered.

2. The adjustment mechanism according to claim 1, characterized in that: The side wall of the shell along the length direction is provided with a first rolling part, and the end surface of the moving unit facing the side wall of the shell is provided with a second rolling part, and the first rolling part and the second rolling part are in rolling cooperation.

3. The adjustment mechanism according to claim 1, characterized in that: The elastic module also includes a guide rod extending along the length direction of the housing and an adjustment block sleeved on the guide rod; wherein, One end of the mechanical tension spring away from the moving unit is connected to the adjustment block; One end of the guide rod facing away from the adjustment block is connected to the shell; the guide rod can drive the adjustment block to adjust relative to the shell along the length direction of the shell.

4. The adjustment mechanism according to claim 3, characterized in that: The adjusting block comprises a main body and a hanging part arranged on the main body, the mechanical tension spring is sleeved on the hanging part of the adjusting block, and a bolt is also installed between the hanging part port of the adjusting block and the main body; A through groove is provided on the front wall or the rear wall of the shell along the thickness direction thereof, and the through groove extends along the length direction of the shell; The bolt is accommodated in the through slot, and one end of the bolt facing away from the adjusting block does not protrude from the through slot.

5. The adjustment mechanism according to claim 1, characterized in that: The adjustment mechanism further includes a fixed pulley set arranged on the inner wall of the housing, and a movable pulley set connected to the moving unit; The fixed pulley block includes at least one fixed pulley, the movable pulley block includes at least one movable pulley, one end of the cable is connected to an external device to be lifted, and the other end of the cable is connected to the device to be lifted outside the shell after alternately passing through the fixed pulley and the movable pulley.

6. The adjustment mechanism according to claim 5, characterized in that: The fixed pulley assembly includes at least one first fixed pulley arranged on the side wall of the shell and at least one second fixed pulley arranged on the rear wall or the front wall of the shell, and the other end of the cable passes around the first fixed pulley, the movable pulley and the second fixed pulley.

7. An adjustable bracket, characterized in that: It comprises the adjusting mechanism as claimed in any one of claims 1 to 6 and a device to be lifted, wherein one end of the device to be lifted is connected to a cable passing through a shell of the adjusting mechanism, and the other end of the device to be lifted is rotatably connected to the shell of the adjusting mechanism.

8. The adjustable bracket according to claim 7, characterized in that: The device to be lifted comprises a connecting arm and a hanging bracket, wherein two ends of the connecting arm are rotatably connected to the housing of the adjusting mechanism and the hanging bracket respectively.

9. The adjustable bracket according to claim 8, characterized in that: One end of the hanger connected to the connecting arm is fixedly connected to the cable; or, One end of the connecting arm connected to the hanger is fixedly connected to the cable.

10. The adjustable bracket according to claim 9, characterized in that: It also includes a plurality of winding posts arranged on the connecting arm, and a pressing plate sleeved on the winding posts; The plurality of winding posts are used for winding the cables, and the opposite end surfaces of the pressure plate and the connecting arm are used for clamping the cables.

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