CN210948164U

CN210948164U - Buffering hinge for closing door

Info

Publication number: CN210948164U
Application number: CN201921362916.6U
Authority: CN
Inventors: 陈玉山
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2020-07-07
Anticipated expiration: 2029-08-21

Abstract

The utility model relates to a buffering hinge of closing door, it includes first page or leaf board and second page or leaf board, first page or leaf board is equipped with first sleeve, second page or leaf board is equipped with the second sleeve, still include rotatory buffering module, this module includes the sleeve pipe, damping device and pivot are transmission each other, and set up in the sleeve pipe, the outer end of pivot is stretched out the sleeve pipe and is connected with first sleeve pipe transmission outside the tube, the sleeve pipe periphery is equipped with the equipartition and has the transmission plane more than two, the second sleeve pipe inner wall is equipped with the transmission trepanning with transmission plane looks adaptation, the sleeve pipe is equipped with at least that the planar position of transmission inserts in the second sleeve pipe, transmission plane and transmission trepanning clearance fit, and transmission fit. The sleeve of the rotary buffering module of the door closing buffering hinge is in clearance fit with the sleeve of one of the leaf plates through the transmission plane and is in transmission connection with the transmission sleeve hole, the assembly is convenient (the installation is not required to be carried out by adopting a pressure device like interference fit), and the transmission is reliable.

Description

Buffering hinge for closing door

Technical Field

The utility model relates to a hinge, especially a buffering hinge closes door.

Background

Chinese patent No. CN201820424583.4 discloses an adjustable hydraulic door hinge in 2018, 11/2/2018, which comprises a force adjusting screw, a dust cap, a spring force adjusting thimble, a meson, a spiral stator, and a push rod, wherein the force adjusting screw is disposed inside a rotating shaft, the dust cap is disposed outside the rotating shaft, a needle roller bearing is disposed outside the rotating shaft, and a thrust bearing is disposed outside the rotating shaft, the spring force adjusting thimble is disposed above the spring, the spring is disposed below the rotating shaft, a first hinge is disposed below the rotating shaft, and the first hinge and a second hinge are disposed in parallel, the meson is disposed outside the spiral rotor, the meson is disposed below the spring, the meson is disposed above the second hinge, the spiral stator is disposed outside the spiral rotor, the push rod is disposed below the rotating shaft, and an independent adjustable hydraulic damper is disposed below the push rod, the lower part of the independent adjustable-speed hydraulic damper is connected with a door closing speed adjusting valve, and a thrust ring is arranged above the thrust bearing. The outer sleeve is arranged outside the rotating shaft of the structure, transmission is realized by interference fit of the outer sleeve and the sleeve of the hinge, and after the hinge is used for a long time, the outer sleeve and the sleeve of the hinge are easy to wear and slip. And, need pressure device (press) during interference fit with two parts pressfitting, the installation degree of difficulty is big.

Disclosure of Invention

An object of the utility model is to provide a simple structure is reasonable, simple to operate, transmission are reliable, rotate smooth and easy buffering hinge of closing door.

The purpose of the utility model is realized like this:

the utility model provides a buffering hinge of closing door, including first page or leaf board and second page or leaf board, first page or leaf board is equipped with first sleeve, second page or leaf board is equipped with the second sleeve, a serial communication port, still include rotatory buffering module, this module includes the sleeve pipe, damping device and pivot are transmission each other, and set up in the sleeve pipe, the outer end of pivot is stretched out the sleeve pipe and is connected with first sleeve pipe transmission outside the sleeve pipe, the sleeve pipe periphery is equipped with the equipartition and has the transmission plane more than two, second sleeve pipe inner wall is equipped with the transmission trepanning with transmission plane looks adaptation, the sleeve pipe is equipped with the planar position of transmission at least and inserts in the second sleeve pipe, transmission plane and transmission trepanning clearance fit, and.

The purpose of the utility model can also adopt the following technical measures to solve:

as a more specific scheme, the periphery of the sleeve is provided with an outer octagonal surface which protrudes out of the periphery of the sleeve, and each plane of the outer octagonal surface is the transmission plane; the transmission trepanning of second sleeve is interior eight corner holes, interior eight corner holes and outer eight corner face clearance fit to form the transmission relation of connection.

As a further scheme, the first sleeve is composed of two sections, the two sections of the first sleeve are respectively a first sleeve section and a second sleeve section, the first sleeve section and the second sleeve section are respectively positioned at two ends of the same edge of the first panel, a yielding groove is formed between the first sleeve section and the second sleeve section, the second sleeve section is arranged in the yielding groove, and a first gasket and a second gasket are respectively arranged between the second sleeve section and the first sleeve section and between the second sleeve section and the first sleeve section; the inner holes of the first section of the first sleeve, the second section of the first sleeve, the first gasket and the second gasket are octagonal holes matched with the outer octagonal surface.

As a further scheme, the outer end cover of pivot is equipped with the plug bush, and the plug bush is with pivot transmission fit, and at least a part of plug bush inserts in one section first sleeve and through eight faceted pebble transmission fit with first sleeve inner wall, one section first sleeve is equipped with the holding screw outward, and the holding screw passes one section first telescopic wall and plug bush outer wall press fit. The sleeve defines the end of the rotational damping module where the rotational damping module cannot be withdrawn.

As a further scheme, the rotating shaft is in transmission connection with a piston rod of a damping device through a lead screw transmission pair, the damping device comprises an outer cylinder body, an inner cylinder body, a piston rod, a door closing speed regulating valve, a piston, an end cover and a return spring, one end of the outer cylinder body is fixedly connected with the sleeve, an inner cavity is formed in the outer cylinder body, hydraulic oil is filled in the inner cavity, the other end of the outer cylinder body extends out of the sleeve and extends into the two sections of first sleeves, and a second needle bearing is arranged between the other end of the outer cylinder body and the two sections of first sleeves; the door closing speed regulating valve is in threaded connection with the other end of the outer cylinder body, one end of the outer cylinder body is provided with an opening communicated with the inner cavity, the inner cylinder body is placed into the inner cavity through the opening, an oil passing channel is arranged between the outer wall of the inner cylinder body and the inner wall of the outer cylinder body, the piston is arranged in the inner cylinder body, the piston divides the inner cylinder body into an upper cavity and a lower cavity, the piston is provided with a one-way valve, the upper cavity and the lower cavity are communicated in one way through the one-way valve, one end of the piston rod is positioned in the inner cylinder body and connected with; an end cover is arranged in the opening, the piston rod penetrates through the end cover, the upper end of the oil passing channel is communicated with the upper cavity, an oil passing adjusting hole is formed in the bottom of the inner cylinder body, and the oil passing channel is communicated with the lower cavity through the oil passing adjusting hole; the return spring is arranged in the inner cylinder body and is in compression joint with the bottom of the piston and the bottom of the lower cavity; the valve needle is arranged on the door closing speed regulating valve corresponding to the oil passing regulating hole, and the flow of the oil passing regulating hole is regulated by rotating the door closing speed regulating valve so as to realize the regulation of the door closing speed. The second needle bearing plays a role in supporting the other end of the rotation buffering module, so that the rotation buffering module cannot be loosened towards the mounting end of the second needle bearing, and the rotation buffering module is reliably positioned in the sleeves of the two page plates.

As a further scheme, the screw rod transmission pair comprises a spiral rotor, a pin shaft and a wear-resistant sleeve, the spiral rotor is rotationally and linearly arranged in the sleeve in a sliding manner, and the spiral rotor is in transmission connection with the rotating shaft and is linearly matched with the rotating shaft in a sliding manner; the outer peripheral surface of the spiral rotor is provided with a spiral groove, the pin shaft is transversely arranged in the sleeve, the wear-resistant sleeve is sleeved outside the pin shaft, and the outer surface of the wear-resistant sleeve is in sliding fit with the spiral groove.

As a further scheme, a transverse pin is arranged outside the rotating shaft, a compression spring is arranged between the transverse pin and the spiral rotor, and the compression spring is sleeved outside the rotating shaft.

As a further scheme, a guide groove penetrating through the peripheral surface of the rotating shaft is formed in the rotating shaft, the transverse pin is arranged in the guide groove and slides along the direction of the central axis of the rotating shaft, an opening is formed in the center of the rotating shaft, one end of the opening is led into the guide groove, the other end of the opening is led into the outer end of the rotating shaft, a door opening force adjusting screw is arranged in the opening, and the door opening force adjusting screw is in threaded connection with the opening. Through adjusting the dynamics adjusting screw that opens the door, can change the distance between horizontal round pin and the screw rotor, changed compression spring's initial compression volume promptly to the dynamics that need overcome when changing the door.

As a further scheme, a ball bearing is arranged between the rotating shaft and the sleeve, one end of the ball bearing extends out of the lantern ring, and a first needle bearing is arranged between the lantern ring and the rotating shaft. The ball bearing can overcome the axial thrust of pivot during operation, and the centripetal thrust of pivot can be overcome to first bearing, consequently, the combination of two kinds of bearings for the pivot can smoothly rotate, also avoids the pivot pine to take off.

As a further scheme, the spiral rotor is provided with a guide hole, the inner wall of the guide hole is provided with an inner guide insection, and the inner guide insection extends along the axial direction of the spiral rotor; the inner end of the rotating shaft is provided with an outer guide insection, the outer guide insection extends along the axis direction of the rotating shaft, the inner end of the rotating shaft is inserted into the guide hole, and the inner guide insection is meshed with the outer guide insection and is in linear sliding fit with the outer guide insection.

The utility model has the advantages as follows:

(1) the sleeve of the rotary buffering module of the door closing buffering hinge is in clearance fit with the sleeve of one of the leaf plates through the transmission plane and is in transmission connection with the transmission sleeve hole, the assembly is convenient (the installation is not required to be carried out by adopting a pressure device like interference fit), and the transmission is reliable.

Drawings

Fig. 1 is an exploded schematic view of an embodiment of the present invention.

Fig. 2 is the utility model discloses well rotatory buffering module decomposes the structure sketch map.

Fig. 3 is a schematic view of the assembled (connecting hole is drilled on the page plate) structure of the present invention.

FIG. 4 is a schematic sectional view A-A of FIG. 3.

Fig. 5 is an enlarged structural schematic diagram of the damping device in fig. 4.

Fig. 6 is an enlarged schematic view of B in fig. 5.

Fig. 7 is a schematic view of the bottom structure of the end cap of the middle damping device of the present invention.

Fig. 8 is a schematic sectional structure view of F-F of fig. 7.

Fig. 9 is a schematic view of the bottom structure of the piston of the damping device of the present invention.

Fig. 10 is a schematic sectional structure view of G-G of fig. 9.

Fig. 11 is a schematic view of the inner cylinder of the middle damping device of the present invention.

Fig. 12 is a bottom view of fig. 11.

Fig. 13 is a structural schematic diagram of the damping device in fig. 5 in another working state.

Fig. 14 is an enlarged view of the structure at J in fig. 13.

Fig. 15 is a schematic perspective view of the present invention.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

referring to fig. 1-4 and 15, a door closing buffering hinge comprises a first leaf 10 and a second leaf 20, wherein the first leaf 10 is provided with a first sleeve, the second leaf 20 is provided with a second sleeve 201, the door closing buffering hinge further comprises a rotary buffering module 70, the module comprises a sleeve 2, a damping device 3 and a rotating shaft 1, the damping device 3 and the rotating shaft 1 are mutually driven and arranged in the sleeve 2, the outer end of the rotating shaft 1 extends out of the sleeve 2 and is in transmission connection with the first sleeve, more than two transmission planes are uniformly distributed on the periphery of the sleeve 2, a transmission trepan boring matched with the transmission planes is arranged on the inner wall of the second sleeve 2, at least the part of the sleeve 2 provided with the transmission planes is inserted into the second sleeve 2, and the transmission planes are in clearance fit with the transmission trepan boring and are in transmission fit.

An outer octagonal surface 21 is arranged on the periphery of the sleeve 2, the outer octagonal surface 21 protrudes out of the periphery of the sleeve 2, and each plane of the outer octagonal surface 21 is the transmission plane; the transmission trepanning of the second sleeve 201 is an inner octagonal hole 202, and the inner octagonal hole 202 is in clearance fit with the outer octagonal surface 21 to form a transmission connection relation.

The first sleeve is composed of two sections, the two sections of the first sleeve are respectively a first section of sleeve 101 and a second section of sleeve 104, the first section of sleeve 101 and the second section of sleeve 104 are respectively positioned at two ends of the same edge of the first panel 10, a yielding groove 103 is formed between the first section of sleeve 101 and the second section of sleeve 104, the second sleeve 201 is arranged in the yielding groove 103, and a first gasket 30 and a second gasket 40 are respectively arranged between the second sleeve 201 and the first section of sleeve 101 and between the second section of sleeve 104; the inner holes of the first sleeve 101, the second sleeve 104, the first gasket 30 and the second gasket 40 are all octagonal holes matched with the outer octagonal face 21.

The outer pot head of pivot 1 is equipped with plug bush 60,

plug bush

60 and 1 transmission coordination of pivot, and plug bush 60 at least some inserts in one section first sleeve 101 and through eight faceted pebble transmission coordination with one section first sleeve 101 inner wall, one section first sleeve 101 is equipped with holding screw 102 outward, and holding screw 102 passes the wall and the plug bush 60 outer wall clearance fit of one section first sleeve 101.

Referring to fig. 5 to 12, the rotating shaft 1 is in transmission connection with a piston rod 31 of a damping device 3 through a lead screw transmission pair, the damping device 3 includes an outer cylinder 33, an inner cylinder 38, a piston rod 31, a door closing speed adjusting valve 32, a piston 35, an end cover 34 and a return spring 37, one end of the outer cylinder 33 is fixedly connected with the sleeve 2, an inner cavity is arranged in the outer cylinder 33, hydraulic oil is filled in the inner cavity, the other end of the outer cylinder 33 extends out of the sleeve 2 and into a second section of first sleeve 104, and a second needle bearing 50 is arranged between the other end of the outer cylinder 33 and the second section of first sleeve 104; the door closing speed regulating valve 32 is in threaded connection with the other end of the outer cylinder body 33, one end of the outer cylinder body 33 is provided with an opening communicated with the inner cavity, the inner cylinder body 38 is placed into the inner cavity through the opening, an oil passing channel is arranged between the outer wall of the inner cylinder body 38 and the inner wall of the outer cylinder body 33, the piston 35 is arranged in the inner cylinder body 38, the inner cylinder body 38 is divided into an upper cavity 381 and a lower cavity 382 by the piston 35, the piston 35 is provided with a one-way valve, the upper cavity 381 and the lower cavity 382 are communicated in a one-way mode by the one-way valve, one end of the piston rod 31 is positioned in the inner cylinder body 38 and connected with the piston 35; an end cover 34 is arranged in the opening, the piston rod 31 penetrates through the end cover 34, the upper end of the oil passing channel is communicated with the upper cavity 381, an oil passing adjusting hole 383 is arranged at the bottom of the inner cylinder body 38, and the oil passing channel is communicated with the lower cavity 382 through the oil passing adjusting hole 383; the return spring 37 is arranged in the inner cylinder body 38 and is pressed at the bottom of the piston 35 and the bottom of the lower cavity 382; the door closing speed regulating valve 32 is provided with a valve needle 321 corresponding to the oil passing regulating hole 383, and the flow rate of the oil passing regulating hole 383 is regulated by rotating the door closing speed regulating valve 32, so that the door closing speed is regulated. The valve pin 321 is tapered with a narrow upper end and a wide lower end.

The bottom of the inner cylinder body 38 is provided with a convex ring 385, the bottom of the inner cylinder body 38 and the inner cavity of the outer cylinder body 33 are raised by the convex ring 385 for a certain distance, a groove 386 is radially arranged on the convex ring 385, and the outer wall of the inner cylinder body 38 is provided with a tangent plane 384 along the axial direction; the bottom surface of the end cover 34 is provided with a radial groove 342, the end cover 34 is provided with a central hole 341 corresponding to the piston rod 31, the inner wall of the central hole 341 is provided with a first positioning groove 343, the periphery of the end cover 34 is provided with a second positioning groove 344, and the first positioning groove 343 and the second positioning groove 344 are respectively used for placing sealing rings. The cut 384 and the inner cavity wall of the outer cylinder 33, the gap 331 between the bottom of the inner cylinder 38 and the bottom of the outer cylinder 33, the slot 386 and the radial slot 342 together form the oil passage.

An annular groove 352 is formed in the periphery of the piston 35, a plurality of oil passing holes 351 are axially formed in the bottom of the piston 35, and the oil passing holes 351 are communicated with the annular groove 352; the annular groove 352 is internally sleeved with a sealing ring 36, the periphery of the sealing ring 36 is in sealing fit with the inner wall of the inner cylinder body 38, the center of the sealing ring 36 is provided with a center oil passing hole 361, the center oil passing hole 361 is in clearance fit with the annular groove 352, the sealing ring 36 is in up-and-down movable fit with the annular groove 352, and the sealing ring 36 is matched with the oil passing hole 351, the center oil passing hole 361 and the annular groove 362 to form the one-way valve.

The screw rod transmission pair comprises a spiral rotor 8, a pin shaft 83 and a wear-resistant sleeve 84, the spiral rotor 8 is rotatably and linearly slidably arranged in the sleeve 2, and the spiral rotor 8 is in transmission connection and linear sliding fit with the rotating shaft 1; the peripheral surface of the spiral rotor 8 is provided with a spiral groove 82, a pin shaft 83 is transversely arranged in the sleeve 2, a wear-resistant sleeve 84 is sleeved outside the pin shaft 83, and the outer surface of the wear-resistant sleeve 84 is in sliding fit with the spiral groove 82.

The other end of the piston rod 31 is connected with the spiral rotor 8 through a second transverse pin 85, and the second transverse pin 85 penetrates through the piston rod 31 and the spiral rotor 8 respectively.

A transverse pin 6 is arranged outside the rotating shaft 1, a compression spring 7 is arranged between the transverse pin 6 and the spiral rotor 8, and the compression spring 7 is sleeved outside the rotating shaft 1.

The utility model discloses a door opening force adjusting mechanism, including pivot 1, horizontal pin 6, trompil 14, guide way 12, horizontal pin 6, trompil 14, door opening force adjusting screw 8 and trompil 14 threaded connection, the pivot is equipped with on 1 and runs through its global guide way 12, horizontal pin sets up in guide way 12 and slides along the central axis direction of pivot 1, and the center of pivot 1 is equipped with trompil 14, and the one end of trompil 14 is.

A ball bearing 5 is arranged between the rotating shaft 1 and the sleeve 2, one end of the ball bearing 5 extends out of the lantern ring, and a first needle bearing 4 is arranged between the lantern ring and the rotating shaft 1.

The spiral rotor 8 is provided with a guide hole 81, the inner wall of the guide hole 81 is provided with an inner guide insection, and the inner guide insection extends along the axial direction of the spiral rotor 8; the inner of pivot 1 is equipped with outer direction insection 13, and outer direction insection 13 extends along the axis direction of pivot 1, and in the inner insertion guiding hole 81 of pivot 1, interior direction insection and outer direction insection 13 meshing and sharp sliding fit.

The working principle is as follows: first page board 10 and second page board 20 are connected with door frame and door respectively, and when opening the door, pivot 1 and sleeve pipe 2 rotate relatively, and pivot 1 drives screw rotor 8 rotatory, and screw rotor 8 is linear motion toward 6 directions of horizontal pin in step in the rotatory process, and compression spring 7 is compressed to the stored energy, and simultaneously, damping device 3's piston rod 31 is stretched out up under reset spring 37 effect. The acting force for opening the door is removed, the compression spring 7 releases the energy, the spiral rotor 8 moves linearly towards the damping device 3, the spiral rotor 8 rotates reversely, the rotating shaft 1 and the sleeve 2 rotate reversely relatively, the door body is automatically closed, the door body is closed, the piston rod 31 retracts towards the inside of the damping device 3 and does damping motion, and therefore the door body is slowly closed.

Referring to fig. 5 and 6, when the piston rod 31 retracts into the damping device 3 (see arrow C in fig. 5 and 6), the piston rod 31 drives the piston 35 to move toward the lower cavity 382 of the inner cylinder 38, the upper surface of the annular groove 352 of the piston 35 pushes the sealing ring 36 to move toward the lower cavity 382 (i.e. the contact position of the top surface of the sealing ring 36 and the upper surface of the annular groove 352 is sealed, see arrow E in fig. 6), the volume of the lower cavity 382 decreases, and the hydraulic oil in the lower cavity 382 slowly enters the upper cavity 381 after passing through the oil adjusting hole 383, the slot 386, the gap 331 between the bottom of the inner cylinder 38 and the bottom of the outer cylinder 33, the gap between the tangent plane 384 and the inner cavity wall of the outer cylinder 33, and the radial groove 342 in sequence, thereby generating a buffering effect. If the door closing speed needs to be adjusted, the length of the valve needle 321 extending into the oil passing adjusting hole 383 is adjusted by adjusting the door closing speed adjusting valve 32, so that the size of the gap between the valve needle 321 and the oil passing adjusting hole 383 is adjusted, the smaller the gap is, the slower the door closing speed is, and vice versa.

Referring to fig. 13 and 14, when the piston rod 31 extends upward along the arrow H in fig. 13 and 14, the return spring 37 deforms and moves, the piston 35 drives the piston rod 31 to extend upward, the piston 35 moves toward the upper chamber 381 of the inner cylinder 38, the lower surface of the annular groove 352 of the piston 35 pushes the sealing ring 36 to move toward the upper chamber 381 (i.e. the top surface of the sealing ring 36 is separated from the upper surface of the annular groove 352 by a certain oil passing gap K, the oil passing gap is communicated with the central oil passing hole 361 and the oil passing hole 351, a part of hydraulic oil in the upper chamber 381 enters the lower chamber 382 from the oil passing gap K, the oil passing hole 361 and the central oil passing hole 361, and another part of hydraulic oil enters the lower chamber 382 through the radial groove 342, the gap between the tangent plane 384 and the inner chamber wall of the outer cylinder 33, the gap 331 between the bottom of the inner cylinder 38 and the bottom of the outer cylinder 33, the slot 386 and the, therefore, when the piston rod 31 of the damping device 3 is extended outwards and reset, the hydraulic oil of the damping device rapidly enters the lower cavity 382 from the upper cavity 381, so that the damping device is reset rapidly, and a buffering effect is provided for the next door closing.

Claims

1. The utility model provides a buffering hinge of closing door, including first page or leaf board and second page or leaf board, first page or leaf board is equipped with first sleeve, second page or leaf board is equipped with the second sleeve, a serial communication port, still include rotatory buffering module, this module includes the sleeve pipe, damping device and pivot are transmission each other, and set up in the sleeve pipe, the outer end of pivot is stretched out the sleeve pipe and is connected with first sleeve pipe transmission outside the sleeve pipe, the sleeve pipe periphery is equipped with the equipartition and has the transmission plane more than two, second sleeve pipe inner wall is equipped with the transmission trepanning with transmission plane looks adaptation, the sleeve pipe is equipped with the planar position of transmission at least and inserts in the second sleeve pipe, transmission plane and transmission trepanning clearance fit, and.

2. The door closing buffering hinge according to claim 1, wherein the outer circumference of the sleeve is provided with an outer octagonal surface protruding out of the outer circumference of the sleeve, and each plane of the outer octagonal surface is the transmission plane; the transmission trepanning of second sleeve is interior eight corner holes, interior eight corner holes and outer eight corner face clearance fit to form the transmission relation of connection.

3. The door closing buffering hinge according to claim 2, wherein the first sleeve is composed of two sections, the two sections of the first sleeve are respectively a first sleeve section and a second sleeve section, the first sleeve section and the second sleeve section are respectively located at two ends of the same edge of the first panel, a abdicating groove is formed between the first sleeve section and the second sleeve section, the second sleeve is arranged in the abdicating groove, and a first gasket and a second gasket are respectively arranged between the second sleeve and the first sleeve section and between the second sleeve section and the first sleeve section; the inner holes of the first section of the first sleeve, the second section of the first sleeve, the first gasket and the second gasket are octagonal holes matched with the outer octagonal surface.

4. The door closing buffering hinge according to claim 3, wherein the outer end of the rotating shaft is sleeved with a plug sleeve, the plug sleeve is in transmission fit with the rotating shaft, at least a part of the plug sleeve is inserted into the first sleeve and is in transmission fit with the inner wall of the first sleeve through an octagonal surface, a fastening screw is arranged outside the first sleeve, and the fastening screw penetrates through the wall surface of the first sleeve and is in compression fit with the outer wall of the plug sleeve.

5. The door closing buffering hinge according to claim 3, wherein the rotating shaft is in transmission connection with a piston rod of a damping device through a lead screw transmission pair, the damping device comprises an outer cylinder body, an inner cylinder body, a piston rod, a door closing speed adjusting valve, a piston, an end cover and a return spring, one end of the outer cylinder body is fixedly connected with the sleeve, an inner cavity is formed in the outer cylinder body, hydraulic oil is filled in the inner cavity, the other end of the outer cylinder body extends out of the sleeve and into the two sections of first sleeves, and a second needle bearing is arranged between the other end of the outer cylinder body and the two sections of first sleeves; the door closing speed regulating valve is in threaded connection with the other end of the outer cylinder body, one end of the outer cylinder body is provided with an opening communicated with the inner cavity, the inner cylinder body is placed into the inner cavity through the opening, an oil passing channel is arranged between the outer wall of the inner cylinder body and the inner wall of the outer cylinder body, the piston is arranged in the inner cylinder body, the piston divides the inner cylinder body into an upper cavity and a lower cavity, the piston is provided with a one-way valve, the upper cavity and the lower cavity are communicated in one way through the one-way valve, one end of the piston rod is positioned in the inner cylinder body and connected with; an end cover is arranged in the opening, the piston rod penetrates through the end cover, the upper end of the oil passing channel is communicated with the upper cavity, an oil passing adjusting hole is formed in the bottom of the inner cylinder body, and the oil passing channel is communicated with the lower cavity through the oil passing adjusting hole; the return spring is arranged in the inner cylinder body and is in compression joint with the bottom of the piston and the bottom of the lower cavity; the valve needle is arranged on the door closing speed regulating valve corresponding to the oil passing regulating hole, and the flow of the oil passing regulating hole is regulated by rotating the door closing speed regulating valve so as to realize the regulation of the door closing speed.

6. The door closing buffering hinge according to claim 5, wherein the screw transmission pair comprises a screw rotor, a pin shaft and a wear-resistant sleeve, the screw rotor is rotatably and linearly slidably arranged in the sleeve, and the screw rotor is in transmission connection with and linearly slidably engaged with the rotating shaft; the outer peripheral surface of the spiral rotor is provided with a spiral groove, the pin shaft is transversely arranged in the sleeve, the wear-resistant sleeve is sleeved outside the pin shaft, and the outer surface of the wear-resistant sleeve is in sliding fit with the spiral groove.

7. The door closing buffering hinge according to claim 6, wherein a transverse pin is provided outside the rotating shaft, a compression spring is provided between the transverse pin and the screw rotor, and the compression spring is sleeved outside the rotating shaft.

8. The door closing buffering hinge according to claim 7, wherein the hinge shaft is provided with a guide groove penetrating through an outer peripheral surface thereof, the cross pin is disposed in the guide groove and slides along a central axis direction of the hinge shaft, a hole is disposed in a center of the hinge shaft, one end of the hole opens into the guide groove, the other end of the hole opens into an outer end of the hinge shaft, a door opening force adjusting screw is disposed in the hole, and the door opening force adjusting screw is in threaded connection with the hole.

9. The door closing buffering hinge according to claim 1, wherein a ball bearing is disposed between the shaft and the sleeve, one end of the ball bearing extends out of the collar, and a first needle bearing is disposed between the collar and the shaft.

10. The door closing buffering hinge according to claim 5, wherein the screw rotor is provided with a guide hole, and an inner wall of the guide hole is provided with an inner guide insection extending along an axial direction of the screw rotor; the inner end of the rotating shaft is provided with an outer guide insection, the outer guide insection extends along the axis direction of the rotating shaft, the inner end of the rotating shaft is inserted into the guide hole, and the inner guide insection is meshed with the outer guide insection and is in linear sliding fit with the outer guide insection.