CN112302446A

CN112302446A - Buffering hinge

Info

Publication number: CN112302446A
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: 2021-02-02
Anticipated expiration: 2040-11-05
Also published as: CN112302446B

Abstract

The invention relates to a buffering hinge which comprises a first hinge sheet and a second hinge sheet which can coaxially and relatively rotate, wherein a first sleeve is arranged on one side of the first hinge sheet, a second sleeve is arranged on one side of the second hinge sheet, the first sleeve and the second sleeve are coaxially sleeved on a mandrel, the mandrel comprises a first fixing sleeve and a second fixing sleeve which are coaxially arranged, the second fixing 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 fixing sleeve from the lower port of the first fixing sleeve, and the driving sleeve is accommodated in the first fixing sleeve; a clutch sleeve and a reset torsion spring are sleeved on the driving shaft between the first fixing sleeve and the second fixing 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 fixing 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

Buffering hinge

Technical Field

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

Background

The hinge is swing joint between mainly used door and window and door frame or the window frame, and traditional hinge is formed on the axle center by door frame hinge and door leaf hinge, only has the function of rotatory activity, adopts the tradition to close the face owing to there is not damping effect, can not prevent wind and close too fast simultaneously and can strike the door frame, also has the potential safety hazard simultaneously.

The buffering hinge is designed for people, for example, the publication No. CN 06837042B discloses a hydraulic buffering hinge, which comprises a shaft sleeve, a door frame leaf hinged with the shaft sleeve and a shaft core arranged in the shaft sleeve, wherein the shaft sleeve is externally sleeved with the door leaf 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 clamped with the guide part; an 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; two sides of the piston are provided with mutually symmetrical lead grooves; a rolling sleeve pin is erected in the shaft sleeve and penetrates through the lead grooves on the two sides of the piston, and a rolling sleeve matched with the lead grooves is sleeved outside the rolling sleeve pin; the lead groove is spiral; the upper part of the lead groove is an opening and closing groove, the middle part of the lead groove is a door stopping groove, and the lower part of the lead groove is a buffer groove; positioning notches matched with the rolling sleeves are formed in the two sides of the middle of the lead groove; an adjusting seat is fixed at the lower end port 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 a 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; hydraulic oil is filled in a cavity formed between the shaft sleeve and the piston; the oil needle sleeve is provided with an auxiliary oil groove which is in a half-cake shape; the damping hole is positioned in the middle of the auxiliary oil groove and communicated with the auxiliary oil groove.

The left and right hinge plates of the hinge need to be opened when the hinge is installed, and the hinge plate is difficult to open due to the elasticity of the energy storage spring which is arranged in the structure; in addition, the damping mechanism in the structure can not freely adjust the opening and closing speed, and can not well meet the requirements of consumers.

Disclosure of Invention

The invention aims to provide a buffering hinge, wherein a clutch mechanism is arranged between a left leaf and a right leaf of the buffering hinge, when the clutch mechanism is in a separated state, the hinge has no buffering and automatic resetting functions compared with a common hinge, meanwhile, the structure in the hinge is improved, a damping mechanism can realize free flow regulation, the opening and closing speed is convenient to regulate, and the buffering hinge has the characteristics of compact structure, convenience in regulation and multiple functions.

The following technical scheme is adopted for achieving the purpose:

the utility model provides a buffering hinge, includes first hinge piece and the second hinge piece that can coaxial relative rotation, first hinge piece one side be equipped with first sleeve pipe, 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 fixing sleeve and a second fixing sleeve which are coaxially arranged, the second fixing 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 fixing sleeve from the lower port of the first fixing sleeve, and the driving sleeve is accommodated in the first fixing sleeve; the driving shaft between the first fixing sleeve and the second fixing sleeve is sleeved with a clutch sleeve and a reset torsion spring, 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 of the first fixing 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, and is characterized in that an axial movable groove is formed in the position of the clutch sleeve, the driving shaft corresponds to 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 acting force far 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 is screwed in the axial clutch hole.

A damping mechanism is arranged between the driving sleeve and the first fixed sleeve; the damping mechanism comprises an axial cavity which is arranged on the top surface of the driving sleeve downwards, the lower part of a piston rod is contained 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 vertical to the axial direction of the axial cavity; 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 fixed sleeve; be provided with the piston head at the piston rod top, the piston head outer fringe matches with first fixed cover inner wall, and the epicoele and cavity of resorption are separated with the inner chamber of first fixed cover to the piston head, have seted up the damping chamber on the piston head, are provided with the damping control valve in the damping chamber, and the epicoele passes through the damping chamber intercommunication with the cavity of resorption, and the damping control valve passes through damping chamber break-make and flow path size, first fixed cover inner chamber be full of hydraulic oil, set up adjust knob at first fixed upper port, adjust knob is connected with the damping control valve through adjusting the pole.

The damping control valve comprises a fixed valve block, a rotating valve block and a rotating shaft, wherein the top of a piston rod is provided with a containing cavity communicated with the damping cavity, the lower part of the rotating shaft is contained in the containing cavity, the centers of the fixed valve block and the rotating valve block are provided with center holes, a convex ring is arranged at the position of the rotating shaft close to the top, the fixed valve block and the rotating valve block are sleeved on the rotating shaft, the bottom of the rotating valve block is abutted against the convex ring, a fastening nut is screwed on the rotating shaft to fasten the rotating valve block on the rotating shaft, the fixed valve block is sleeved on the periphery of the fastening nut, the fixed valve block is mutually attached to the rotating valve block below, the fixed valve block and the rotating valve block are further provided with flow regulating holes, the rotating valve block rotates relative to the fixed valve block to regulate the overlapping caliber.

The bottom of the damping cavity is provided with a flow passage hole, the flow passage hole is communicated with the damping cavity and the lower cavity, the upper port of the damping cavity is communicated with the upper cavity, a limiting convex rib is arranged inside the damping cavity, the outer edge part of the rotating valve plate is provided with a limiting groove matched with the limiting convex rib, the upper port of the damping cavity is provided with a first annular groove, the outer diameter of the fixed valve plate is matched with the inner diameter of the first annular groove, the inner wall of the first annular groove is provided with a positioning groove, and the outer edge of the fixed valve plate is provided with a positioning convex rib matched with the positioning groove; 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 inner part of the sealing ring, and the upper end of the damping cavity is provided with a clamping ring to limit the fixed valve plate in the damping cavity; and a spring is arranged between the rotating valve plate and the bottom of the damping cavity and pushes the rotating valve plate against the fixed valve plate so that the rotating valve plate and the fixed valve plate are attached to each other.

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

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

the outer wall of the second fixing sleeve is also provided with a rotation stopping convex rib matched with 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.

The upper end part of the spiral groove is provided with an anti-drop groove.

The hinge is equivalent to a common hinge when the clutch mechanism is in a separated state, the buffer and automatic reset functions are not provided, the hinge is convenient to open when the hinge is installed, and the buffer and automatic reset functions can be recovered by rotating the clutch screw to push the clutch pin to the clutch groove after the hinge is installed.

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 fixed sleeve, and only the driving shafts and the adjusting rods with different sizes need to be replaced aiming at the hinges with different sizes, so that the parts have good universality, the cost can be greatly saved, and the cost performance of the product is improved.

Drawings

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

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

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

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

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

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

FIG. 7 is a schematic structural view of a mandrel of the present invention;

FIG. 8 is a schematic structural view of the mandrel of the present invention (II);

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

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

FIG. 11 is a schematic view of a portion of a mandrel in accordance with the present invention;

FIG. 12 is a schematic view 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 a schematic 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 to 15, a buffering hinge includes a first hinge piece 81 and a second hinge piece 82 which are coaxially and relatively rotatable, a first sleeve 83 is disposed on one side of the first hinge piece, a second sleeve 84 is disposed on one side of the second hinge piece 82, the first sleeve 83 and the second sleeve 84 are coaxially sleeved on a core shaft, a plane bearing 85 is disposed between the first sleeve 83 and the second sleeve 84, the core shaft includes a first fixing sleeve 1 and a second fixing sleeve 2 which are coaxially disposed, the second fixing sleeve is fixed 2 on a driving shaft 31, a rotation stop plane 35 is disposed on the driving shaft 31, and a shaft hole of the second fixing sleeve 2 is provided with a rotation stop portion which is matched with the rotation stop 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 fixing sleeve 1 from the lower port of the first fixing sleeve 1, and the driving sleeve 32 is accommodated in the first fixing sleeve 1; the clutch sleeve 5 and the reset torsion spring 4 are sleeved on the driving shaft 31 between the first fixing sleeve 1 and the second fixing 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 of the first fixing sleeve 1, and the other end of the reset torsion spring 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 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 arranged on the top surface of the driving sleeve 32 downwards, the lower part of a piston rod 41 is contained 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 vertical to the axial direction of the axial cavity 33; the two ends of the driving pin 42 are received in the guide groove 13 of the inner wall of the first fixing sleeve 1 through the spiral groove 34; 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 fixing sleeve 1, the piston head 43 separates the inner cavity of the first fixing sleeve into an upper cavity 14 and a lower cavity 15, the piston head 43 is provided with a damping cavity 44, 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 switched on and off through the damping cavity 44 and has a flow path, the inner cavity of the first fixing sleeve 2 is filled with hydraulic oil, an adjusting knob 712 is arranged at the upper port of the first fixing 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 inner wall of the lower port of the driving shaft 31 and the first.

The damping control valve includes a fixed valve plate 61, the rotary valve plate 62 and the rotary shaft 63, the top of the piston rod 41 is provided with an accommodating cavity 45 communicated with the damping cavity, the lower part of the rotary shaft 63 is accommodated in the accommodating cavity 45, the centers of the fixed valve plate 61 and the rotary valve plate 62 are provided with center holes, the position of the rotary shaft 63 close to the top is provided with a convex ring 64, the fixed valve plate 61 and the rotary valve plate 62 are sleeved on the rotary shaft 63, the bottom of the rotary valve plate 62 is abutted against the convex ring 64, a fastening nut 65 is screwed on the rotary shaft 63 to fasten the rotary valve plate 62 on the rotary shaft 63, the fixed valve plate 61 is sleeved on the periphery of the fastening nut 65, the fixed valve plate 61 is mutually attached to the rotary valve plate 62 below, the fixed valve plate 61 and the rotary valve plate 62 are also provided with flow regulating holes 66, the rotary valve plate 62 rotates relative to the fixed valve plate 61 to regulate the overlapping caliber.

The bottom of the damping cavity 44 is provided with a flow passage hole 46, the flow passage 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 inside the damping cavity 44, the outer edge of the rotating valve plate 62 is provided with a limiting groove 67 matched with the limiting convex rib 47, 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 snap 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 rotating valve plate 62 and the bottom of the damping cavity 44, and the spring 60 enables the rotating valve plate 62 to be abutted against the fixed valve plate 61, so that the rotating valve plate 62 is attached to the fixed valve plate 61.

The invention adds a clutch mechanism on the driving shaft 31, the clutch mechanism determines separation or combination by the axial position of the clutch pin 52 in the axial movable groove 5, the position of the clutch pin 52 is determined by the cooperation of the clutch spring 54 and the clutch screw 55, the clutch spring 54 always applies thrust force to the clutch pin 52 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 the axial clutch hole and finally determines the position of the clutch pin 52 by rotating, the clutch screw 55 is propped into the clutch groove 53 by compressing the clutch spring 54, the driving shaft 31 is combined with the clutch sleeve 5, the reset torsion spring 4 is involved to work, and restoring force is provided for the combined 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 freely rotate relative to the driving shaft 31, the hinge is equivalent to a common hinge, the face closing sheet can freely rotate without restoring force, and the hinge is convenient to mount in the state.

When acting force is applied to enable the first hinge piece and the second hinge piece to rotate relatively in the working process, 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, two sides of the driving pin 42 are accommodated in the guide groove 13, the driving pin 42 can only move upwards in the axial direction of the first fixed sleeve along the guide groove 13, the driving pin 42 upwards drives the piston rod 41 and the piston head 43 to move upwards 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, when the size of the overlapped caliber of the flow adjusting hole 66 determines the lifting speed of the piston head 43, the speed adjusting purpose is achieved, and the damping mechanism is matched with the reset torsion spring to play a.

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

In the invention, the lower end part of the driving shaft 31 is also provided with a connecting sleeve 9 below the second fixing sleeve 2, 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 rotation stopping convex ribs matched with the inner wall of the first sleeve 83; the outer wall of the second fixing sleeve 2 is also provided with a rotation stopping convex rib matched with the inner wall of the second sleeve 84; aiming at hinges with different sizes, the hinge fixing device only needs to extend or shorten the driving shaft, when the driving shaft 31 is longer, the connecting sleeve 9 is 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 the product is improved.

Claims

1. The utility model provides a buffering hinge, includes first hinge piece and the second hinge piece that can coaxial relative rotation, first hinge piece one side be equipped with first sleeve pipe, 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 fixing sleeve and a second fixing sleeve which are coaxially arranged, the second fixing 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 fixing sleeve from the lower port of the first fixing sleeve, and the driving sleeve is accommodated in the first fixing sleeve; the driving shaft between the first fixing sleeve and the second fixing sleeve is sleeved with a clutch sleeve and a reset torsion spring, 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 of the first fixing sleeve, and the other end of the reset torsion spring is clamped in a clamping groove of the clutch sleeve.

2. The buffering hinge as claimed in claim 1, wherein: the clutch mechanism comprises a clutch sleeve corresponding to the driving shaft, and is characterized in that an axial movable groove is formed in the position of the clutch sleeve, the driving shaft corresponds to 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 acting force far 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 is screwed in the axial clutch hole.

3. The buffering hinge as claimed in claim 1, wherein: a damping mechanism is arranged between the driving sleeve and the first fixed sleeve; the damping mechanism comprises an axial cavity which is arranged on the top surface of the driving sleeve downwards, the lower part of a piston rod is contained 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 vertical to the axial direction of the axial cavity; 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 fixed sleeve; be provided with the piston head at the piston rod top, the piston head outer fringe matches with first fixed cover inner wall, and the epicoele and cavity of resorption are separated with the inner chamber of first fixed cover to the piston head, have seted up the damping chamber on the piston head, are provided with the damping control valve in the damping chamber, and the epicoele passes through the damping chamber intercommunication with the cavity of resorption, and the damping control valve passes through damping chamber break-make and flow path size, first fixed cover inner chamber be full of hydraulic oil, set up adjust knob at first fixed upper port, adjust knob is connected with the damping control valve through adjusting the pole.

4. The buffering hinge as claimed in claim 3, wherein: the damping control valve comprises a fixed valve block, a rotating valve block and a rotating shaft, wherein the top of a piston rod is provided with a containing cavity communicated with the damping cavity, the lower part of the rotating shaft is contained in the containing cavity, the centers of the fixed valve block and the rotating valve block are provided with center holes, a convex ring is arranged at the position of the rotating shaft close to the top, the fixed valve block and the rotating valve block are sleeved on the rotating shaft, the bottom of the rotating valve block is abutted against the convex ring, a fastening nut is screwed on the rotating shaft to fasten the rotating valve block on the rotating shaft, the fixed valve block is sleeved on the periphery of the fastening nut, the fixed valve block is mutually attached to the rotating valve block below, the fixed valve block and the rotating valve block are further provided with flow regulating holes, the rotating valve block rotates relative to the fixed valve block to regulate the overlapping caliber.

5. The buffering hinge as claimed in claim 4, wherein: the bottom of the damping cavity is provided with a flow passage hole, the flow passage hole is communicated with the damping cavity and the lower cavity, the upper port of the damping cavity is communicated with the upper cavity, a limiting convex rib is arranged inside the damping cavity, the outer edge part of the rotating valve plate is provided with a limiting groove matched with the limiting convex rib, the upper port of the damping cavity is provided with a first annular groove, the outer diameter of the fixed valve plate is matched with the inner diameter of the first annular groove, the inner wall of the first annular groove is provided with a positioning groove, and the outer edge of the fixed valve plate is provided with a positioning convex rib matched with the positioning groove; 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 inner part of the sealing ring, and the upper end of the damping cavity is provided with a clamping ring to limit the fixed valve plate in the damping cavity; and a spring is arranged between the rotating valve plate and the bottom of the damping cavity and pushes the rotating valve plate against the fixed valve plate so that the rotating valve plate and the fixed valve plate are attached to each other.

6. The buffering hinge as claimed in claim 3, wherein: an oil seal is arranged between the driving shaft and the inner wall of the lower port of the first fixing sleeve, and an oil seal is arranged between the adjusting knob and the upper port of the first fixing sleeve.

7. The buffering hinge as claimed in claim 1, wherein: a connecting sleeve is also arranged at the lower end part of the driving shaft and below the second fixing 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 rotation stopping convex ribs matched with the inner wall of the first sleeve, and the outer wall of the second fixing sleeve is also provided with rotation stopping convex ribs matched with the inner wall of the second sleeve.

8. The buffering hinge as claimed in claim 1, wherein: a plane bearing is arranged between the first sleeve and the second sleeve.

9. The buffering hinge as claimed in 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.

10. The buffering hinge as claimed in claim 3, wherein: the upper end part of the spiral groove is provided with an anti-drop groove.