CN115153245A

CN115153245A - Automatic pressure-following balancing device and sofa

Info

Publication number: CN115153245A
Application number: CN202210708689.8A
Authority: CN
Inventors: 熊锋
Original assignee: Foshan Shunde Meiyaxin Furniture Industrial Co ltd
Current assignee: Foshan Shunde Meiyaxin Furniture Industrial Co ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-10-11
Anticipated expiration: 2042-06-21
Also published as: CN115153245B

Abstract

The invention discloses a pressure following automatic balancing device and a sofa, wherein the pressure following automatic balancing device comprises a support seat part arranged at the lower end of the seat part, a communicating pipe filled with flowing liquid is arranged in the support seat part, a vertically arranged plunger pipe is arranged at the end of the communicating pipe, pistons matched with the communicating pipe are movably arranged in the plunger pipe up and down, the upper end surface of each piston is fixedly connected with a push rod, and the push rod is connected with a pressure driving assembly.

Description

Automatic pressure-following balancing device and sofa

Technical Field

The invention relates to the field of chairs, in particular to an automatic pressure-following balancing device and a sofa.

Background

With the continuous improvement of living standard of people, various intelligent furniture gradually enters the life of people, and the chair also appears as a new type of essential furniture such as a massage chair and the like.

In the using process of the chair, especially a bench or a sitting sofa, because the number of users is multiple, when a single person uses the chair, the single side is stressed frequently, so that the stability of the chair is affected, and certain using potential safety hazards exist if one end of the chair upwarps and is easy to turn on one side; in addition, in the household life, the lower part of the chair is difficult to clean, and the dust is seriously accumulated; in view of the above two points, an automatic balancing device and a sofa with pressure are needed.

Disclosure of Invention

The invention aims to provide an automatic pressure-following balancing device and a sofa chair, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a along with pressure automatic balancing device, is including setting up the support portion at seat portion lower extreme, be equipped with on the support portion with seat portion landing leg assorted connecting seat, seat portion is fixed to be set up on the support portion, be equipped with the communicating pipe of filling mobile liquid in the support portion, the end of communicating pipe is equipped with the plunger pipe of vertical setting, and the piston rather than matcing is installed to the activity from top to bottom in the plunger pipe, the up end fixed connection push rod of piston, pressure drive assembly is connected to the push rod, still be equipped with along with the mobile clean drive assembly of liquid in the communicating pipe, clean drive assembly still connects clean dust removal subassembly.

As a further scheme of the invention: the support part is provided with a liquid outlet and a liquid inlet which are communicated with the communicating pipe.

As a still further scheme of the invention: the communicating pipe is one or a combination of a linear pipe, an annular pipe and a cross pipe.

As a still further scheme of the invention: the driving assembly that the push rod is connected is the electric drive assembly, the electric drive assembly includes pressure sensing device, automatically controlled pressure jar spare and controller subassembly, the relative support portion lower end of plunger pipe all is equipped with the base, all install pressure sensing device in the base, the output that the automatically controlled pressure jar spare was pressed in the push rod connection, the vertical setting of automatically controlled pressure jar spare and output set up downwards, the equal electric connection controller subassembly of automatically controlled pressure jar spare and pressure sensing device.

As a still further scheme of the invention: the driving assembly connected with the push rod is an elastic driving assembly, the elastic driving assembly comprises a bearing seat plate, a sleeve, a limiting plate, a spring and a press rod, the bearing seat plate is installed on the bearing end face of the chair, the lower end of the bearing seat plate is fixedly connected with the vertically arranged press rod, the press rod is installed in the sleeve in a vertically movable mode, the sleeve is fixedly connected onto the support portion, the lower end of the press rod is further connected with the push rod, the limiting plate is fixedly arranged on the press rod, and the spring is sleeved on the press rod between the limiting plate and the bottom face of the sleeve.

As a still further scheme of the invention: the cleaning driving assembly comprises an impeller and a rotating shaft, the rotating shaft perpendicular to the flowing direction of the liquid is installed on the communicating pipe, and the impeller is installed on the rotating shaft.

As a still further scheme of the invention: the cleaning and dust removing component is a blowing and dust removing component which comprises a driving wheel, a driving wheel and a fan blade component, the driving wheel is arranged on a rotating shaft outside the communicating pipe, the driving wheel is connected with the driving wheel through a driving belt, and the driving wheel is connected with a rotating shaft center of the fan blade component.

As a still further scheme of the invention: the utility model discloses a cleaning assembly, including the cleaning assembly, the cleaning assembly is cleaned for rotating, the rotation assembly is cleaned including helical gear, no. two helical gears, rolling disc and cleaning head, helical gear installs in the axis of rotation outside the intercommunication pipe, be equipped with in the intercommunication pipe with helical gear mesh and level set up No. two helical gears, no. two helical gears are installed on the transmission shaft, the rotation center of rolling disc is connected to the transmission shaft, and the eccentricity is provided with the drive block on the rolling disc, the one end of swing arm is rotated and is set up, be equipped with on the swing arm with drive block assorted sliding tray, the lower extreme of drive block is equipped with the portion of cleaning, and the end of drive block still is equipped with the cleaning head that is used for cleaning.

Another object of the present application is to provide a sofa chair using the above automatic balancing device with pressure.

Compared with the prior art, the invention has the beneficial effects that:

when the device is added with a counterweight base and filled with liquid to ensure the weight of the base, the pressure of an internal liquid pipeline is changed by an electric drive assembly or an elastic drive assembly when bearing pressure, so that the timely compensation of unbalanced pressure is realized, the unbalanced degree of stress of the chair is reduced to the maximum extent, and the safety and the stability of the chair in use are ensured;

on the basis of realizing pressure compensation, internal liquid flow is also used as power, dust accumulation below the chair is effectively avoided by relying on the blowing dust removal assembly or the rotating cleaning assembly, and great convenience is provided for cleaning the chair and the house;

the invention has simple structure, strong practicability and easy use and popularization.

Drawings

Fig. 1 is a schematic structural view of an automatic pressure-dependent balancing apparatus.

Fig. 2 is a schematic structural view of a seat portion in the automatic pressure-following balancing apparatus.

Fig. 3 is a schematic structural view of a communicating pipe in the automatic pressure-following balancing apparatus.

Fig. 4 is a schematic diagram of the structure of an electric driving assembly in the automatic pressure-dependent balancing device.

Fig. 5 is a schematic structural diagram of an elastic driving assembly in the automatic pressure-dependent balancing device.

Fig. 6 is a schematic structural diagram of an impeller in the automatic pressure-dependent balancing device.

Fig. 7 is a schematic structural view of a driving wheel in the automatic pressure-dependent balancing apparatus.

FIG. 8 is a schematic view of a fan blade of the automatic balancing device with pressure.

Fig. 9 is a schematic structural diagram of a first bevel gear and a second bevel gear in the automatic pressure-dependent balancing device.

Fig. 10 is a schematic structural view of a swing arm in the automatic pressure-dependent balancing apparatus.

Wherein: 1. a seat portion; 2. a stand section; 3. a communicating pipe; 301. an annular tube; 302. a cross-shaped pipe; 4. a plunger tube; 5. a piston; 6. a push rod; 7. a base; 8. a liquid discharge port; 9. a liquid inlet; 10. a pressure sensing device; 11. an electrically controlled pressure cylinder; 12. a load bearing seat plate; 13. a sleeve; 14. a limiting plate; 15. a spring; 16. a pressure lever; 17. an impeller; 18. a rotating shaft; 19. a drive wheel; 20. a driving wheel; 21. a transmission belt; 22. a fan blade member; 23. a first bevel gear; 24. a second bevel gear; 25. a drive shaft; 26. rotating the disc; 27. a swing arm; 28. a drive block; 29. a cleaning head.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1 to 4, in the embodiment of the present invention, an automatic pressure balancing apparatus includes a support portion 2 disposed at a lower end of a seat portion 1, a connection seat matched with a support leg of the seat portion 1 is disposed on the support portion 2, the seat portion 1 is fixedly disposed on the support portion 2, a communication pipe 3 filled with flowing liquid is disposed in the support portion 2, a plunger pipe 4 vertically disposed is disposed at an end of the communication pipe 3, a piston 5 matched with the plunger pipe 4 is movably mounted in the plunger pipe 4 up and down, an upper end surface of the piston 5 is fixedly connected with a push rod 6, the push rod 6 is connected with a pressure driving assembly, and the plunger pipe 4 and the support leg of the seat portion 1 are disposed in one-to-one correspondence;

the support part 2 is provided with a liquid outlet 8 and a liquid inlet 9 which are communicated with the communicating pipe 3, and the flowing liquid filled in the support part 2 is injected or discharged into or out of the support part 2 through the liquid outlet 8 and the liquid inlet 9;

the communication pipe 3 is one or a combination of a linear pipe, an annular pipe 301 and a cross pipe 302, so that a smooth liquid channel is realized in the lower end of the seat part 1, and the smooth and rapid flow adjustment of liquid is facilitated when pressure is received;

the electric driving assembly comprises a pressure sensing device 10, an electric control pressure cylinder 11 and a controller assembly, wherein the base 7 is arranged at the lower end of the support part 2 opposite to the plunger tube 4, the pressure sensing device 10 is installed in the base 7, the push rod 6 is connected with the output end of the electric control pressure cylinder 11, the electric control pressure cylinder 11 is vertically arranged, the output end of the electric control pressure cylinder 11 is arranged downwards, the electric control pressure cylinder 11 and the pressure sensing device 10 are electrically connected with the controller assembly, the controller assembly is preferably a common PLC (programmable logic controller), and the PLC receives information transmitted by the pressure sensing device 10 and controls the electric control pressure cylinder 11 to act, so that the piston 5 is driven to be compressed inside along the plunger tube 4, and liquid is driven to flow, so that the whole bearing of the chair is adjusted.

When the chair is used, the chair is stressed in a balanced manner in an initial state, and all the electric drive assemblies are in a standby state; when the weight difference of people on one side or two sides of the chair is large, the pressure at each support leg is detected and obtained through the pressure sensing device 10 in the base 7, the electric control pressure cylinder 11 at the position with large pressure is started to drive the piston 5 at the position to move downwards along the plunger tube 4, the flowing liquid filled in the pressure sensing device 10 is driven to flow towards the direction with small pressure through the change of local pressure, and the electric control pressure cylinder 11 stops or the piston 5 stops after reaching the limit stroke when the pressure detected by the pressure sensing device 10 tends to be equal in the movement process of the piston 5, so that the unbalanced pressure borne by the chair is compensated; the device is when adding counter weight base and filling liquid and guaranteeing base weight, still through when bearing pressure, changes inside liquid pipeline pressure through electric drive subassembly, realizes the timely compensation to unbalanced pressure, and furthest's the unbalanced degree that reduces the chair atress has guaranteed security and stability of chair when using.

Example 2:

referring to fig. 5, the difference between the present embodiment and embodiment 1 is that the driving component connected to the push rod 6 is an elastic driving component, the elastic driving component includes a bearing seat plate 12, a sleeve 13, a limiting plate 14, a spring 15 and a press rod 16, the bearing seat plate 12 is installed on a bearing end surface of the chair, and specifically can be installed in or below an elastic cushion of the sofa, when a person sits on the sofa, the bearing seat plate 12 is pressed downward by self-weight, the lower end of the bearing seat plate 12 is fixedly connected to the vertically arranged press rod 16, the press rod 16 is movably installed in the sleeve 13 up and down, the sleeve 13 is fixedly connected to the support part 2, the lower end of the press rod 16 is also connected to the push rod 6, the press rod 16 is fixedly provided with the limiting plate 14, and the spring 15 is sleeved on the press rod 16 between the limiting plate 14 and the bottom surface of the sleeve 13;

when a person sits on the sofa, the weight drives the bearing seat plate 12 to move downwards, the compression bar 16 connected with the lower end of the bearing seat plate 12 slides downwards in the sleeve 13, on one hand, the piston 5 connected with the push rod 6 is driven to move downwards along the plunger tube 4 to drive the liquid in the internal pipeline to flow, on the other hand, the compression spring 15 is also pressed through the limiting plate 14 until the bearing seat plate 12 reaches the upper end face of the sleeve 13 or the piston 5 reaches the limit stroke, after the person leaves the chair, the seat is reset under the action of the internal pressure and the elastic force of the spring 15, the stable driving effect on the internal liquid is also achieved, and the unbalanced pressure borne by the chair is quickly and automatically compensated.

Example 3:

referring to fig. 6 to 8, in the embodiment of the present invention, on the basis of the embodiments 1 and 2, the problem of cleaning under the chair is mainly solved, so as to avoid the occurrence of dust deposition.

The communicating pipe 3 is also internally provided with a cleaning driving component flowing along with liquid, the cleaning driving component comprises an impeller 17 and a rotating shaft 18, the rotating shaft 18 vertical to the flowing direction of the liquid is installed on the communicating pipe 3, the impeller 17 is installed on the rotating shaft 18, and when the liquid is driven to flow by the internal balanced pressure, the impeller 17 is driven to rotate, so that the rotating shaft 18 rotates along with the liquid;

the cleaning driving assembly is connected with the blowing and dust removing assembly, the blowing and dust removing assembly comprises a driving wheel 19, a driving wheel 20 and a fan blade part 22, the driving wheel 19 is installed on a rotating shaft 18 outside the communicating pipe 3 and rotates along with the rotating shaft 18, the driving wheel 19 is connected with the driving wheel 20 through a driving belt 21, the driving wheel 20 is connected with the rotating shaft center of the fan blade part 22, when the internal liquid flows to drive the impeller 17 and the rotating shaft 18 to rotate, the driving wheel 19 at the end of the rotating shaft 18 rotates along with the rotating shaft, the rotation of the driving wheel 19 is transmitted to the driving wheel 20 through the driving belt 21, so that the driving wheel 20 drives the fan blade part 22 to work, the blowing effect is performed below the chair, the intermittent blowing is performed along with the sitting of a person, the dust accumulation below the chair is effectively avoided, and great convenience is provided for the cleaning of the chair and the house.

Example 4:

referring to fig. 9 to 10, the embodiment of the present invention is different from embodiment 3 in that the cleaning assembly for chair cleaning is a rotary cleaning assembly, the rotary cleaning assembly includes a first helical gear 23, a second helical gear 24, a rotary disc 26 and a cleaning head 29, the first helical gear 23 is mounted on a rotary shaft 18 outside a communicating pipe 3 and rotates along with the rotary shaft 18, the communicating pipe 3 is provided with the second helical gear 24 engaged with the first helical gear 23 and horizontally disposed, the second helical gear 24 is mounted on a transmission shaft 25, the transmission shaft 25 is connected with a rotation center of the rotary disc 26, the rotary disc 26 is eccentrically provided with a driving block 28, one end of the swing arm 27 is rotatably disposed, the swing arm 27 is provided with a sliding groove matched with the driving block 28, the lower end of the driving block 28 is provided with a cleaning part, and the end of the driving block 28 is further provided with the cleaning head 29 for cleaning;

when inside liquid equilibrium pressure flows, drive impeller 17 and axis of rotation 18 and rotate, utilize the meshing transmission of a helical gear 23 and No. two helical gears 24, drive transmission shaft 25 and rotate, thereby make transmission shaft 25 connect the transmission of rolling disc 26, rolling disc 26 utilizes the motion of drive block 28 in the sliding tray of swing arm 27, it carries out reciprocating swing to drive swing arm 27, the cleaning cloth of drive block 28 lower extreme cleans the region of its process, the cleaning head 29 of cooperation end, it is clean to carry out good cover in the chair below, the effectual deposition that avoids the chair below, the cleanness for chair and house provides very big facility.

Example 5:

the present embodiment provides a sofa using the above automatic pressure balancing apparatus based on

embodiments

1, 2, 3 and 4, and the sofa further compensates the unbalanced pressure in time on the basis of increasing the liquid balance weight, so as to reduce the unbalanced degree of the stress on the chair to the maximum, ensure the safety and stability of the chair during use, and simultaneously consider the cleaning of the lower portion of the chair, thereby avoiding the occurrence of the dust accumulation phenomenon.

The working principle of the invention is as follows:

when the device is added with a counterweight base and filled with liquid to ensure the weight of the base, the pressure of an internal liquid pipeline is changed through an electric drive assembly when bearing pressure, so that the unbalanced pressure is compensated in time, the stress of a chair is balanced in an initial state, and each electric drive assembly is in a standby state; when the weight difference between people on one side or two sides of the chair is large, the pressure at each support leg is detected and obtained through the pressure sensing device 10 in the base 7, the electric control pressure cylinder 11 at the position with large pressure is started to drive the piston 5 at the position to move downwards along the plunger tube 4, flowing liquid filled in the pressure sensing device 10 is driven to flow towards the direction with small pressure through the change of local pressure, and the electric control pressure cylinder 11 stops when the pressure detected by the pressure sensing device 10 tends to be equal in the movement process of the piston 5 or the piston 5 stops after reaching the limit stroke;

in addition, an elastic driving assembly can be used as a driving force for flowing of internal liquid, when a person sits on the sofa, the load bearing seat plate 12 is driven by the dead weight to move downwards, a pressure rod 16 connected to the lower end of the load bearing seat plate 12 slides downwards in a sleeve 13, on one hand, a piston 5 connected with a push rod 6 is driven to move downwards along a plunger tube 4 to drive the internal pipeline liquid to flow, on the other hand, a spring 15 is pressed through a limiting plate 14 until the load bearing seat plate 12 reaches the upper end face of the sleeve 13 or the piston 5 reaches a limit stroke, and after the person leaves the chair, the internal pressure and the elastic force of the spring 15 reset, so that the stable driving effect on the internal liquid is also achieved, and the compensation on the unbalanced pressure born by the chair is rapidly and automatically achieved;

on the basis, when the internal liquid flows to drive the impeller 17 and the rotating shaft 18 to rotate, the driving wheel 19 at the end of the rotating shaft 18 rotates along with the rotation, the rotation of the driving wheel 19 is transmitted to the driving wheel 20 through the transmission belt 21, so that the driving wheel 20 drives the fan blade pieces 22 to work, the air blowing effect is performed below the chair, the air blowing effect is performed along with the high-frequency intermittent air blowing when a person sits away, and the air blowing and dust removing effects are achieved;

or utilize to rotate and clean the subassembly and remove dust, when the balanced pressure of internal liquid flows, drive impeller 17 and axis of rotation 18 and rotate, utilize the meshing transmission of helical gear 23 and helical gear 24 No. two, drive transmission shaft 25 rotates, thereby make transmission shaft 25 connect the transmission of rolling disc 26, rolling disc 26 utilizes the motion of drive block 28 in the sliding tray of swing arm 27, drive swing arm 27 and carry out reciprocating swing, the cleaning cloth of drive block 28 lower extreme cleans the region that it passed through, the cleaning head 29 of cooperation end, carry out good cover cleanness to the chair below, the deposition of effectual chair below of avoiding, the deposition of chair below is effectively avoided to the cleanness of chair and house provides very big facility effectual avoiding, the cleanness of chair and house provides very big facility.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, in the description of the present invention, "a plurality" means two or more unless otherwise specified. A feature defined as "first," "second," etc. may explicitly or implicitly include one or more of the feature.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The automatic pressure-following balancing device is characterized by comprising a support part (2) arranged at the lower end of a seat part (1), wherein a connecting seat matched with a support leg of the seat part (1) is arranged on the support part (2), the seat part (1) is fixedly arranged on the support part (2), a communicating pipe (3) filled with flowing liquid is arranged in the support part (2), a vertically arranged plunger pipe (4) is arranged at the end of the communicating pipe (3), a piston (5) matched with the plunger pipe is movably arranged in the plunger pipe (4) up and down, a push rod (6) is fixedly connected to the upper end surface of the piston (5), and the push rod (6) is connected with a pressure driving assembly;

and a cleaning driving assembly flowing along with the liquid is further arranged in the communicating pipe (3), and the cleaning driving assembly is further connected with a cleaning and dust removing assembly.

2. The automatic pressure-dependent balancing device according to claim 1, wherein the supporting seat (2) is provided with a liquid outlet (8) and a liquid inlet (9) which are communicated with the communicating pipe (3).

3. The automatic pressure-following balancing device according to claim 1, characterized in that the communicating pipe (3) is one or more of a combination of a linear pipe, an annular pipe (301) and a cross-type pipe (302).

4. The automatic pressure-following balancing device according to claim 1, characterized in that the driving assembly connected to the push rod (6) is an electric driving assembly, the electric driving assembly includes a pressure sensing device (10), an electric control pressure cylinder (11) and a controller assembly, the lower ends of the support portions (2) opposite to the plunger tube (4) are provided with bases (7), the bases (7) are provided with the pressure sensing device (10), the push rod (6) is connected to the output end of the electric control pressure cylinder (11), the electric control pressure cylinder (11) is vertically arranged with the output end downward, and both the electric control pressure cylinder (11) and the pressure sensing device (10) are electrically connected to the controller assembly.

5. The automatic pressure-dependent balance device according to claim 1, wherein the driving component connected with the push rod (6) is an elastic driving component, the elastic driving component comprises a bearing seat plate (12), a sleeve (13), a limiting plate (14), a spring (15) and a pressure lever (16), the bearing seat plate (12) is installed on the bearing end face of the chair, the lower end of the bearing seat plate (12) is fixedly connected with the vertically arranged pressure lever (16), the pressure lever (16) is installed in the sleeve (13) in a vertically movable manner, the sleeve (13) is fixedly connected on the support part (2), the lower end of the pressure lever (16) is further connected with the push rod (6), the limiting plate (14) is fixedly arranged on the pressure lever (16), and the spring (15) is sleeved on the pressure lever (16) between the limiting plate (14) and the bottom face of the sleeve (13).

6. The automatic pressure-following balancing device according to claim 1, characterized in that the cleaning driving assembly comprises an impeller (17) and a rotating shaft (18), the communicating pipe (3) is provided with the rotating shaft (18) perpendicular to the flow direction of the liquid, and the impeller (17) is mounted on the rotating shaft (18).

7. The automatic pressure-dependent balancing device according to claim 1, wherein the cleaning and dust-removing assembly is a blowing and dust-removing assembly, the blowing and dust-removing assembly comprises a driving wheel (19), a transmission wheel (20) and a fan blade member (22), the driving wheel (19) is mounted on a rotating shaft (18) outside the communicating pipe (3), the driving wheel (19) is connected with the transmission wheel (20) through a transmission belt (21), and the transmission wheel (20) is connected with a rotating shaft center of the fan blade member (22).

8. The automatic pressure-following balancing device according to claim 1, wherein the cleaning and dust removing assembly is a rotary cleaning assembly, the rotary cleaning assembly comprises a first helical gear (23), a second helical gear (24), a rotary disc (26) and a cleaning head (29), the first helical gear (23) is mounted on a rotary shaft (18) outside a communicating pipe (3), the communicating pipe (3) is provided with the second helical gear (24) which is meshed with the first helical gear (23) and horizontally arranged, the second helical gear (24) is mounted on a transmission shaft (25), the transmission shaft (25) is connected with a rotation center of the rotary disc (26), the rotary disc (26) is eccentrically provided with a driving block (28), one end of the swing arm (27) is rotatably arranged, the swing arm (27) is provided with a sliding groove matched with the driving block (28), the lower end of the driving block (28) is provided with a cleaning part, and the end of the driving block (28) is further provided with the cleaning head (29) for cleaning.

9. A sofa chair comprising the automatic pressure-dependent balancing apparatus of any one of claims 1 to 8.