CN112302446B

CN112302446B - Buffer hinge

Info

Publication number: CN112302446B
Application number: CN202011227669.6A
Authority: CN
Inventors: 陈云
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2024-08-06
Anticipated expiration: 2040-11-05
Also published as: CN112302446A

Abstract

The invention relates to a buffer hinge, which comprises a first hinge piece and a second hinge piece which can coaxially and relatively rotate, wherein a first sleeve is arranged on one side of the first hinge piece, a second sleeve is arranged on one side of the second hinge piece, the first sleeve and the second sleeve are coaxially sleeved on a mandrel, the mandrel comprises a first fixed sleeve and a second fixed sleeve which are coaxially arranged, the second fixed sleeve is fixed on a driving shaft, a driving sleeve is arranged at the upper end of the driving shaft, the upper part of the driving shaft extends into the first fixed sleeve from the lower port of the first fixed sleeve, and the driving sleeve is accommodated in the first fixed sleeve; a clutch sleeve and a reset torsion spring are sleeved on the driving shaft between the first fixed sleeve and the second fixed sleeve, a clutch mechanism is arranged between the clutch sleeve and the driving shaft, one end of the reset torsion spring is clamped in a clamping groove at the lower end part of the first fixed sleeve, and the other end of the reset torsion spring is clamped in a clamping groove of the clutch sleeve; the invention realizes the functions of buffering, automatic resetting and clutching, and has the characteristics of compact structure, convenient adjustment and multiple functions.

Description

Buffer hinge

Technical Field

The invention relates to a hinge, in particular to a buffer hinge.

Background

The hinge is mainly used in movable connection between door and window and door frame or window frame, and traditional hinge is formed by hinge of door frame and hinge of door leaf on the axle core, only has the function of rotary motion, adopts traditional face that closes because there is not the damping effect, can not prevent wind and close too soon can strike the door frame simultaneously, also has the potential safety hazard simultaneously.

For this purpose, a buffering hinge is designed, for example, publication number CN 06837042B discloses a hydraulic buffering hinge, which comprises a shaft sleeve, a door frame page hinged with the shaft sleeve, and a shaft core arranged in the shaft sleeve, wherein the shaft sleeve is sleeved with a door leaf page connected with the shaft core, and one end of the shaft core is provided with a guide part; the guide part is sleeved with a piston which is clamped with the guide part; the energy storage spring is sleeved outside the shaft core; one end of the energy storage spring is abutted against the upper end of the shaft core, and the other end of the energy storage spring is abutted against the piston; lead grooves which are symmetrical with each other are formed in two sides of the piston; a rolling pin is arranged in the shaft sleeve in a erected mode, penetrates through lead grooves on two sides of the piston, and a rolling sleeve matched with the lead grooves is sleeved outside the rolling pin; the lead groove is spiral; the upper part of the lead groove is provided with an opening and closing groove, the middle part of the lead groove is provided with a door stopping groove, and the lower part of the lead groove is provided with a buffer groove; positioning notches matched with the rollers are formed in two sides of the middle of the lead groove; an adjusting seat is fixed at the port of the lower end of the shaft sleeve; an adjusting screw is screwed on the adjusting seat; the adjusting screw is connected with an oil needle; an oil needle sleeve is fixed at the bottom of the piston; the oil needle sleeve is provided with a damping hole matched with the oil needle; a damping channel is formed by the gap between the damping hole and the oil needle; the oil needle comprises an upper needle body and a lower needle body, the diameter of the upper needle body is larger than that of the lower needle body, and a step is formed between the upper needle body and the lower needle body; the oil needle sleeve is provided with a one-way valve; the cavity formed between the shaft sleeve and the piston is filled with hydraulic oil; an auxiliary oil groove is formed in the oil needle sleeve, and the auxiliary oil groove is semi-cake-shaped; the damping hole is positioned in the middle of the auxiliary oil groove and is communicated with the auxiliary oil groove.

When the hinge is installed, the left and right hinge plates of the hinge are required to be opened, and the energy storage spring is arranged in the structure, so that the hinge plates are difficult to open due to the elasticity of the energy storage spring; in addition, the damping mechanism in the structure cannot freely adjust the opening and closing speed, and cannot well meet the requirements of consumers.

Disclosure of Invention

The invention aims to provide a buffer hinge, a clutch mechanism is arranged between left and right leaves of the buffer hinge, when the clutch mechanism is in a separation state, the hinge has no buffer and automatic reset functions compared with a common hinge, meanwhile, the structure in the hinge is improved, the damping mechanism can realize free flow adjustment, and the opening and closing speed is convenient to adjust.

The following technical scheme is adopted for realizing the purposes:

The utility model provides a buffering hinge, but including coaxial relative pivoted first hinge piece and second hinge piece, be equipped with first sleeve pipe on one side of first hinge piece, one side of second hinge piece is equipped with second sleeve pipe, its characterized in that: the first sleeve and the second sleeve are coaxially sleeved on the mandrel, the mandrel comprises a first fixed sleeve and a second fixed sleeve which are coaxially arranged, the second fixed sleeve is fixed on a driving shaft, a driving sleeve is arranged at the upper end of the driving shaft, the upper part of the driving shaft extends into the first fixed sleeve from the lower port of the first fixed sleeve, and the driving sleeve is accommodated in the first fixed sleeve; the clutch sleeve and the reset torsion spring are sleeved on the driving shaft between the first fixed sleeve and the second fixed sleeve, a clutch mechanism is arranged between the clutch sleeve and the driving shaft, one end of the reset torsion spring is clamped in the clamping groove at the lower end part of the first fixed sleeve, and the other end of the reset torsion spring is clamped in the clamping groove of the clutch sleeve.

The clutch mechanism comprises a clutch sleeve corresponding to the driving shaft, an axial movable groove is formed in the position of the clutch sleeve, a clutch pin penetrates through the axial movable groove, the clutch pin is accommodated in the clutch sleeve, a clutch groove is formed in the clutch sleeve, a clutch spring is arranged between the clutch pin and the clutch sleeve, and the clutch spring applies an acting force away from the clutch groove to the clutch pin; an axial clutch hole is formed from the lower end of the driving shaft to the axial movable groove, and a clutch screw rod is connected in the axial clutch hole in a rotating way.

A damping mechanism is arranged between the driving sleeve and the first fixed sleeve; the damping mechanism comprises an axial cavity which is downwards arranged on the top surface of the driving sleeve, the lower part of a piston rod is accommodated in the axial cavity, a spiral groove is arranged on the side wall of the axial cavity, a driving pin is arranged on the piston rod, and the axial direction of the driving pin is perpendicular to the axial direction of the axial cavity; the two ends of the driving pin penetrate through the spiral groove and are accommodated in the guide groove on the inner wall of the first fixing sleeve; the piston rod is characterized in that a piston head is arranged at the top of the piston rod, the outer edge of the piston head is matched with the inner wall of a first fixed sleeve, the piston head separates an inner cavity of the first fixed sleeve into an upper cavity and a lower cavity, a damping cavity is formed in the piston head, a damping control valve is arranged in the damping cavity, the upper cavity is communicated with the lower cavity through the damping cavity, the damping control valve is opened and closed through the damping cavity and the flow path is large and small, the inner cavity of the first fixed sleeve is filled with hydraulic oil, an adjusting knob is arranged at an upper port of the first fixed sleeve, and the adjusting knob is connected with the damping control valve through an adjusting rod.

The damping control valve comprises a fixed valve block, a rotary valve block and a rotary shaft, wherein an accommodating cavity communicated with the damping cavity is formed in the top of a piston rod, a central hole is formed in the center of the fixed valve block and the center of the rotary valve block, a convex ring is arranged at the position, close to the top, of the rotary shaft, the fixed valve block and the rotary valve block are sleeved on the rotary shaft, the bottom of the rotary valve block is propped against the convex ring, a fastening nut is screwed on the rotary shaft to fasten the rotary valve block on the rotary shaft, the fixed valve block is sleeved on the periphery of the fastening nut, the fixed valve block is mutually attached to the rotary valve block below, a flow adjusting hole is formed in the fixed valve block and the rotary valve block, the flow adjusting hole is overlapped with the rotary valve block in a rotary mode, and the flow path size of the damping cavity is changed.

The damping device is characterized in that a flow passage hole is formed in the bottom of the damping cavity, the flow passage hole is communicated with the damping cavity and the lower cavity, an upper port of the damping cavity is communicated with the upper cavity, a limiting convex rib is arranged in the damping cavity, a limiting groove matched with the limiting convex rib is formed in the outer edge of the rotary valve plate, a first annular groove is formed in the upper port of the damping cavity, the outer diameter of the fixed valve plate is matched with the inner diameter of the first annular groove, a positioning groove is formed in the inner wall of the first annular groove, and a positioning convex rib matched with the positioning groove is arranged at the outer edge of the fixed valve plate; a sealing ring is arranged between the fixed valve plate and the bottom surface of the annular groove; the flow regulating hole is positioned in the sealing ring, and a clamping ring is arranged at the upper end of the damping cavity to limit the fixed valve plate in the damping cavity; a spring is arranged between the rotary valve plate and the bottom of the damping cavity, and the spring pushes the rotary valve plate to the fixed valve plate so that the rotary valve plate and the fixed valve plate are mutually attached.

An oil seal is arranged between the driving shaft and the inner wall of the lower port of the first fixed sleeve, and an oil seal is arranged between the adjusting knob and the upper port of the first fixed sleeve.

A connecting sleeve is further arranged at the lower end part of the driving shaft and positioned below the second fixed sleeve, and the connecting sleeve is sleeved on the driving shaft through a bearing; the outer walls of the first fixing sleeve and the connecting sleeve are provided with anti-rotation convex ribs matched with the inner wall of the first sleeve,

And the outer wall of the second fixing sleeve is also matched with the anti-rotation convex rib of the inner wall of the second sleeve.

A plane bearing is arranged between the first sleeve and the second sleeve.

The driving shaft is provided with a rotation stopping plane, and the shaft hole of the second fixing sleeve is provided with a rotation stopping part matched with the rotation stopping plane.

An anti-falling groove is arranged at the upper end part of the spiral groove.

The clutch mechanism is additionally arranged, the clutch mechanism controls the combination and separation between the driving shaft and the first fixed sleeve, when the clutch mechanism is in a separation state, the hinge is equivalent to a common hinge, the buffer and automatic reset functions are not provided, the clutch mechanism is convenient for opening the hinge when the hinge is installed, and after the installation is finished, the buffer and automatic reset functions can be recovered by rotating the clutch screw rod to push the clutch pin to the clutch groove.

In addition, the damping mechanism can freely adjust the size of the flow path, and realize stepless adjustment of the opening speed so as to meet the requirements of different occasions; the driving mechanism, the buffer mechanism and the clutch mechanism are all arranged in the upper fixing sleeve, and only the driving shafts and the adjusting rods with different sizes are required to be replaced aiming at hinges with different sizes, so that the universality of the components is good, the cost can be greatly saved, and the cost performance of the product is improved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic diagram of the structure of the present invention (II);

FIG. 3 is a schematic diagram of the front structure of the present invention;

FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 3 in accordance with the present invention;

FIG. 5 is a schematic side view of the present invention;

FIG. 6 is a cross-sectional view taken along line B-B in FIG. 5 in accordance with the present invention;

FIG. 7 is a schematic view (I) of a mandrel according to the present invention;

FIG. 8 is a schematic diagram of a mandrel according to the present invention;

FIG. 9 is a schematic view (I) of the internal structure of the mandrel according to the present invention;

FIG. 10 is a schematic view (II) of the internal structure of the mandrel according to the present invention;

FIG. 11 is a schematic view of a portion of a mandrel according to the present invention;

FIG. 12 is a schematic view of the structure of the drive shaft and damping mechanism of the present invention;

FIG. 13 is an exploded view of the damping mechanism of the present invention;

FIG. 14 is an exploded view of the damping mechanism of the present invention;

fig. 15 is a schematic structural view of the clutch sleeve of the present invention.

Detailed Description

As shown in fig. 1-15, a buffer hinge comprises a first hinge piece 81 and a second hinge piece 82 which can coaxially and relatively rotate, wherein a first sleeve 83 is arranged on one side of the first hinge piece, a second sleeve 84 is arranged on one side of the second hinge piece 82, the first sleeve 83 and the second sleeve 84 are coaxially sleeved on a mandrel, a plane bearing 85 is arranged between the first sleeve 83 and the second sleeve 84, the mandrel comprises a first fixed sleeve 1 and a second fixed sleeve 2 which are coaxially arranged, the second fixed sleeve 2 is fixed on a driving shaft 31, a rotation stopping plane 35 is arranged on the driving shaft 31, and a shaft hole of the second fixed sleeve 2 is provided with a rotation stopping part matched with the rotation stopping plane 35; the upper end of the driving shaft 31 is provided with a driving sleeve 32, the upper part of the driving shaft 31 extends into the first fixed sleeve 1 from the lower port of the first fixed sleeve 1, and the driving sleeve 32 is accommodated in the first fixed sleeve 1; the clutch sleeve 5 and the reset torsion spring 4 are sleeved on the driving shaft 31 between the first fixed sleeve 1 and the second fixed sleeve 2, a clutch mechanism is arranged between the clutch sleeve 5 and the driving shaft 31, one end of the reset torsion spring 4 is clamped in the upper clamping groove 11 at the lower end part of the first fixed sleeve 1, and the other end is clamped in the lower clamping groove 12 of the clutch sleeve 5.

The clutch mechanism comprises a clutch sleeve corresponding to the driving shaft 31, an axial movable groove 51 is formed in the position of the clutch sleeve, a clutch pin 52 penetrates through the axial movable groove 51, the clutch pin 52 is accommodated in the clutch sleeve 5, a clutch groove 53 is formed in the clutch sleeve 5, a clutch spring 54 is arranged between the clutch pin 52 and the clutch sleeve 5, and the clutch spring 54 applies an acting force far away from the clutch groove 53 to the clutch pin 52; an axial clutch hole is formed from the lower end of the driving shaft 31 to the axial movable groove 51, and a clutch screw 55 is screwed in the axial clutch hole.

A damping mechanism is arranged between the driving sleeve 32 and the first fixed sleeve 1; the damping mechanism comprises an axial cavity 33 which is downwards arranged on the top surface of a driving sleeve 32, a lower part of a piston rod 41 is accommodated in the axial cavity 33, a spiral groove 34 is arranged on the side wall of the axial cavity 33, a driving pin 42 is arranged on the piston rod 41, and the axial direction of the driving pin 42 is perpendicular to the axial direction of the axial cavity 33; the two ends of the driving pin 42 penetrate through the spiral groove 34 and are accommodated in the guide groove 13 on the inner wall of the first fixed sleeve 1; the top of the piston rod 41 is provided with a piston head 43, the outer edge of the piston head 43 is matched with the inner wall of the first fixed sleeve 1, the piston head 43 separates the inner cavity of the first fixed sleeve into an upper cavity 14 and a lower cavity 15, a damping cavity 44 is formed in the piston head 43, a damping control valve is arranged in the damping cavity 44, the upper cavity 14 is communicated with the lower cavity 15 through the damping cavity 44, the damping control valve is opened and closed through the damping cavity 44 and has a flow path size, the inner cavity of the first fixed sleeve 2 is filled with hydraulic oil, an adjusting knob 712 is arranged at the upper port of the first fixed sleeve 2, the adjusting knob 71 is connected with the damping control valve through an adjusting rod 72, an oil seal is arranged between the driving shaft 31 and the inner wall of the lower port of the first fixed sleeve 1, and an oil seal is arranged between the adjusting knob 71 and the upper port of the first fixed sleeve 1.

The damping control valve comprises a fixed valve block 61, a rotary valve block 62 and a rotary shaft 63, wherein an accommodating cavity 45 communicated with a damping cavity is formed in the top of a piston rod 41, an accommodating cavity 45 is formed in the lower portion of the rotary shaft 63, central holes are formed in the centers of the fixed valve block 61 and the rotary valve block 62, a convex ring 64 is arranged at the position, close to the top, of the rotary shaft 63, the fixed valve block 61 and the rotary valve block 62 are sleeved on the rotary shaft 63, the bottom of the rotary valve block 62 is abutted against the convex ring 64, a fastening nut 65 is screwed on the rotary shaft 63 to fasten the rotary valve block 62 on the rotary shaft 63, the fixed valve block 61 is sleeved on the periphery of the fastening nut 65, the fixed valve block 61 and the rotary valve block 62 below are mutually attached, a flow adjusting hole 66 is formed in the positions of the fixed valve block 61 and the rotary valve block 62, and the flow adjusting hole 66 is adjusted in a rotating mode relative to the fixed valve block 61, and the flow path size of the damping cavity 44 is changed.

The bottom of the damping cavity 44 is provided with a runner hole 46, the runner hole 46 is communicated with the damping cavity 44 and the lower cavity 15, the upper port of the damping cavity 44 is communicated with the upper cavity 14, a limiting convex rib 47 is arranged in the damping cavity 44, a limiting groove 67 matched with the limiting convex rib 47 is formed in the outer edge part of the rotary valve plate 62, the upper port of the damping cavity 44 is provided with a first annular groove 48, the outer diameter of the fixed valve plate 61 is matched with the inner diameter of the first annular groove 48, the inner wall of the first annular groove 48 is provided with a positioning groove 49, and the outer edge of the fixed valve plate 61 is provided with a positioning convex rib 68 matched with the positioning groove 49; a sealing ring 69 is arranged between the fixed valve plate 61 and the bottom surface of the annular groove 48; the flow regulating hole 66 is positioned in the sealing ring 69, and a clamping ring is arranged at the upper end of the damping cavity 44 to limit the fixed valve plate 61 in the damping cavity 44; a spring 60 is arranged between the rotary valve plate 62 and the bottom of the damping cavity 44, and the spring 60 pushes the rotary valve plate 62 against the fixed valve plate 61 so that the rotary valve plate 62 and the fixed valve plate 61 are mutually attached.

The clutch mechanism is additionally arranged on the driving shaft 31, the clutch mechanism comprises a clutch pin 52 which is axially positioned in an axial movable groove 5 to determine separation or combination, the position of the clutch pin 52 is determined by matching a clutch spring 54 and a clutch screw 55, the clutch spring 54 always applies thrust to the clutch pin 52 in a direction away from the clutch groove, the end part of the clutch screw 55 is propped against the clutch pin 52, the clutch screw 55 is screwed in an axial clutch hole to finally determine the position of the clutch pin 52 through rotation, the clutch screw 55 is propped up to compress the clutch spring 54 to prop the clutch pin 52 into the clutch groove 53, at the moment, the driving shaft 31 is combined with the clutch sleeve 5, and the reset torsion spring 4 is inserted to work to provide restoring force for a combining surface.

When the clutch screw 55 is withdrawn, the clutch pin 52 is separated from the clutch sleeve 5 under the action of the clutch spring 54, the clutch sleeve 5 can rotate freely relative to the driving shaft 31, the hinge is equivalent to a common hinge, the hinge can rotate freely without restoring force, and the hinge is convenient to install in the state.

When the first hinge piece and the second hinge piece are relatively rotated by acting force in the working process of the invention, the driving shaft 31 and the driving sleeve 32 rotate together, the driving sleeve 32 rotates to enable the driving pin 42 to move along the spiral groove 34, the driving pin 42 can only move upwards along the axial direction of the guiding groove 13 in the first fixed sleeve as the two sides of the driving pin 42 are accommodated in the guiding groove 13, the driving pin 42 drives the piston rod 41 and the piston head 43 upwards to move together, the piston head 43 moves upwards to enable the space of the upper cavity 14 and the lower cavity 15 to be changed, at the moment, hydraulic pressure does not need to flow downwards through the damping cavity 44, the flow path is controlled by the damping mechanism, the lifting speed of the piston head 43 is determined when the flow adjusting hole 66 overlaps the caliber, and therefore the purpose of adjusting the speed is achieved, and the damping mechanism and the reset torsion spring are matched to play a role of buffering.

The invention is provided with an anti-falling groove 36 at the upper end part of the spiral groove 34; when the hinge is opened at the maximum angle, the driving pin 42 enters the anti-falling groove 36, and the acting force for opening the door is released at this time, so that the reset torsion spring 4 cannot overcome the fact that the driving pin 42 is separated from the anti-falling groove 36, and the locking function is achieved.

The invention is also provided with a connecting sleeve 9 below the second fixed sleeve 2 at the lower end part of the driving shaft 31, and the connecting sleeve 9 is sleeved on the driving shaft 31 through a bearing 91; the outer walls of the first fixed sleeve 1 and the connecting sleeve 9 are provided with anti-rotation convex ribs matched with the inner wall of the first sleeve 83; a rotation stopping convex rib which is also matched with the inner wall of the second sleeve 84 on the outer wall of the second fixed sleeve 2; according to the hinge with different sizes, only the driving shaft is required to be lengthened or shortened, when the driving shaft 31 is longer, the connecting sleeve 9 is further arranged below the second fixing sleeve 2 at the lower end part of the driving shaft 31, the connecting sleeve 9 is sleeved on the driving shaft 31 through the bearing 91, and other parts are completely universal, so that the cost can be greatly saved, and the cost performance of a product is improved.

Claims

1. The utility model provides a buffering hinge, but including coaxial relative pivoted first hinge piece and second hinge piece, be equipped with first sleeve pipe on one side of first hinge piece, one side of second hinge piece is equipped with second sleeve pipe, its characterized in that: the first sleeve and the second sleeve are coaxially sleeved on the mandrel, the mandrel comprises a first fixed sleeve and a second fixed sleeve which are coaxially arranged, the second fixed sleeve is fixed on a driving shaft, a driving sleeve is arranged at the upper end of the driving shaft, the upper part of the driving shaft extends into the first fixed sleeve from the lower port of the first fixed sleeve, and the driving sleeve is accommodated in the first fixed sleeve; a clutch sleeve and a reset torsion spring are sleeved on the driving shaft between the first fixed sleeve and the second fixed sleeve, a clutch mechanism is arranged between the clutch sleeve and the driving shaft, one end of the reset torsion spring is clamped in a clamping groove at the lower end part of the first fixed sleeve, and the other end of the reset torsion spring is clamped in a clamping groove of the clutch sleeve; the clutch mechanism comprises a clutch sleeve corresponding to the driving shaft, an axial movable groove is formed in the position of the clutch sleeve, a clutch pin penetrates through the axial movable groove, the clutch pin is accommodated in the clutch sleeve, a clutch groove is formed in the clutch sleeve, a clutch spring is arranged between the clutch pin and the clutch sleeve, and the clutch spring applies an acting force away from the clutch groove to the clutch pin; an axial clutch hole is formed from the lower end of the driving shaft to the axial movable groove, and a clutch screw rod is connected in the axial clutch hole in an internal rotation way; a damping mechanism is arranged between the driving sleeve and the first fixing sleeve.

2. The cushioned hinge of claim 1, wherein: the damping mechanism comprises an axial cavity which is downwards arranged on the top surface of the driving sleeve, the lower part of a piston rod is accommodated in the axial cavity, a spiral groove is arranged on the side wall of the axial cavity, a driving pin is arranged on the piston rod, and the axial direction of the driving pin is perpendicular to the axial direction of the axial cavity; the two ends of the driving pin penetrate through the spiral groove and are accommodated in the guide groove on the inner wall of the first fixing sleeve; the piston rod is characterized in that a piston head is arranged at the top of the piston rod, the outer edge of the piston head is matched with the inner wall of a first fixed sleeve, the piston head separates an inner cavity of the first fixed sleeve into an upper cavity and a lower cavity, a damping cavity is formed in the piston head, a damping control valve is arranged in the damping cavity, the upper cavity is communicated with the lower cavity through the damping cavity, the damping control valve is opened and closed through the damping cavity and the flow path is large and small, the inner cavity of the first fixed sleeve is filled with hydraulic oil, an adjusting knob is arranged at an upper port of the first fixed sleeve, and the adjusting knob is connected with the damping control valve through an adjusting rod.

3. A cushioned hinge as claimed in claim 2 wherein: the damping control valve comprises a fixed valve block, a rotary valve block and a rotary shaft, wherein an accommodating cavity communicated with the damping cavity is formed in the top of a piston rod, a central hole is formed in the center of the fixed valve block and the center of the rotary valve block, a convex ring is arranged at the position, close to the top, of the rotary shaft, the fixed valve block and the rotary valve block are sleeved on the rotary shaft, the bottom of the rotary valve block is propped against the convex ring, a fastening nut is screwed on the rotary shaft to fasten the rotary valve block on the rotary shaft, the fixed valve block is sleeved on the periphery of the fastening nut, the fixed valve block is mutually attached to the rotary valve block below, a flow adjusting hole is formed in the fixed valve block and the rotary valve block, the flow adjusting hole is overlapped with the rotary valve block in a rotary mode, and the flow path size of the damping cavity is changed.

4. A cushioned hinge as claimed in claim 3 wherein: the damping device is characterized in that a flow passage hole is formed in the bottom of the damping cavity, the flow passage hole is communicated with the damping cavity and the lower cavity, an upper port of the damping cavity is communicated with the upper cavity, a limiting convex rib is arranged in the damping cavity, a limiting groove matched with the limiting convex rib is formed in the outer edge of the rotary valve plate, a first annular groove is formed in the upper port of the damping cavity, the outer diameter of the fixed valve plate is matched with the inner diameter of the first annular groove, a positioning groove is formed in the inner wall of the first annular groove, and a positioning convex rib matched with the positioning groove is arranged at the outer edge of the fixed valve plate; a sealing ring is arranged between the fixed valve plate and the bottom surface of the annular groove; the flow regulating hole is positioned in the sealing ring, and a clamping ring is arranged at the upper end of the damping cavity to limit the fixed valve plate in the damping cavity; a spring is arranged between the rotary valve plate and the bottom of the damping cavity, and the spring pushes the rotary valve plate to the fixed valve plate so that the rotary valve plate and the fixed valve plate are mutually attached.

5. A cushioned hinge as claimed in claim 2 wherein: an oil seal is arranged between the driving shaft and the inner wall of the lower port of the first fixed sleeve, and an oil seal is arranged between the adjusting knob and the upper port of the first fixed sleeve.

6. The cushioned hinge of claim 1, wherein: a connecting sleeve is further arranged at the lower end part of the driving shaft and positioned below the second fixed sleeve, and the connecting sleeve is sleeved on the driving shaft through a bearing; the outer walls of the first fixing sleeve and the connecting sleeve are provided with anti-rotation convex ribs matched with the inner wall of the first sleeve, and the outer wall of the second fixing sleeve is also provided with anti-rotation convex ribs matched with the inner wall of the second sleeve.

7. The cushioned hinge of claim 1, wherein: a plane bearing is arranged between the first sleeve and the second sleeve.

8. The cushioned hinge of claim 1, wherein: the driving shaft is provided with a rotation stopping plane, and the shaft hole of the second fixing sleeve is provided with a rotation stopping part matched with the rotation stopping plane.

9. A cushioned hinge as claimed in claim 2 wherein: an anti-falling groove is arranged at the upper end part of the spiral groove.