CN106499285B

CN106499285B - High sealed door pneumatic self-positioning and self-closing hinge

Info

Publication number: CN106499285B
Application number: CN201510631441.6A
Authority: CN
Inventors: 吴裕龙
Original assignee: Tongguan (xiamen) Electronic Technology Co ltd
Current assignee: Tongguan (xiamen) Electronic Technology Co ltd
Priority date: 2015-08-31
Filing date: 2015-09-29
Publication date: 2024-04-09
Anticipated expiration: 2035-09-29
Also published as: CN106499285A

Abstract

The invention discloses a high-sealing door pneumatic self-positioning and self-closing hinge which comprises a hinge, a fixed seat, a fixed rod, a threaded sleeve, a plug and a center sleeve. The hinge is provided with a shaft sleeve and a blade, and the fixed seat is provided with the shaft sleeve. The center is sleeved with a first row of air inlets; the central sleeve is sleeved in the shaft sleeve of the hinge and the shaft sleeve of the fixed seat; a fixed rod, a center seat, two springs and a one-way valve are arranged between the screw sleeve and the plug in the center sleeve; the screw rod of the fixed rod is in threaded connection with the screw sleeve, the fixed rod is provided with an exhaust piston, and the exhaust piston is in sealed sliding connection in the center sleeve; the first spring is propped between the fixed rod and the center seat, the positioning spring is propped between the center seat and the one-way valve, the one-way valve is arranged in the center sleeve in a sealing way, and an air pressure chamber is formed between the exhaust piston and the one-way valve. The exhaust piston moves towards the one-way valve, air in the air pressure chamber is discharged outwards through the first row of air inlet holes and the one-way valve, and after the exhaust piston slides through the first row of air inlet holes, the air in the air pressure chamber is discharged outwards through the one-way valve. The hinge can be self-positioned in a preset positioning angle, and can be self-closed below the positioning angle which is withdrawn from the preset positioning angle.

Description

High sealed door pneumatic self-positioning and self-closing hinge

Technical Field

The utility model relates to a high-sealing door pneumatic self-positioning and self-closing hinge.

Background

The Chinese patent database announces the utility model with the name of lifting hinge device and the patent number of 2013208356551. The device comprises an upper hinge, a lower hinge, a transmission seat and a transmission rod. The upper hinge comprises an upper shaft sleeve and an upper closing blade fixedly connected with the upper shaft sleeve; the lower hinge comprises a lower shaft sleeve and a lower closing blade fixedly connected with the lower shaft sleeve; the transmission seat is fixedly connected with the upper shaft sleeve, the bottom end surface of the transmission seat is concavely provided with a transmission cavity, and the inner rotating surface of the transmission cavity is provided with a first spiral part. The transmission pole rigid coupling lower axle sleeve, the external swivel surface of this transmission pole is equipped with the second spiral part, and this transmission pole connects the transmission chamber, and this first spiral part and second spiral part adaptation meshing, wherein: the upper hinge is pushed to rotate relative to the lower hinge, and the upper hinge can be lifted through the cooperation of the first spiral part and the second spiral part; the upper hinge is lowered under the action of gravity by releasing pushing, and the upper hinge can be automatically reset and closed by matching the first spiral part and the second spiral part. The lifting hinge device directly utilizes the cooperation of the upper shaft sleeve and the lower shaft sleeve to realize the switching, but cannot be divided into self-closing and self-positioning.

Disclosure of Invention

The invention provides a high-sealing door pneumatic self-positioning and self-closing hinge, which overcomes the defects of a lifting hinge device in the background technology.

One of the technical schemes adopted for solving the technical problems is as follows:

the high sealing door pneumatic self-positioning and self-closing hinge comprises a hinge, a fixed seat, a fixed rod and a screw sleeve, wherein the hinge is provided with a shaft sleeve and a blade connected outside the shaft sleeve, the fixed seat is provided with another shaft sleeve, the hinge can rotate relative to the fixed seat and the convex seat, and the fixed rod is provided with a screw; the device also comprises a plug and a central sleeve, wherein the central sleeve and the shaft sleeve are respectively provided with a first row of air inlets penetrating inside and outside along the axial line, the axial direction and the circumferential space dimension position; the center sleeve is sleeved in the shaft sleeve of the hinge and the shaft sleeve of the fixed seat; the screw sleeve is rotatably arranged in the center sleeve and fixedly connected with a shaft sleeve, the plug is arranged in the center sleeve and fixedly connected with another shaft sleeve, the screw sleeve is spaced from the plug, and a fixed rod, a first spring, a center seat, a positioning spring and a one-way valve are arranged between the screw sleeve and the plug in the center sleeve; the screw rod of the fixed rod is in threaded connection with the screw sleeve, the fixed rod is provided with an exhaust piston, and the exhaust piston is in sealed sliding connection in the center sleeve; the first spring is propped between the fixed rod and the center seat, the positioning spring is propped between the center seat and the one-way valve, the one-way valve is arranged in the center sleeve in a sealing way, and a pneumatic chamber is formed between the exhaust piston and the one-way valve; wherein: the exhaust piston moves towards the one-way valve, air in the air pressure chamber is discharged outwards through the first row of air inlet holes and the one-way valve, and after the exhaust piston slides through the first row of air inlet holes, the air in the air pressure chamber is discharged outwards through the one-way valve.

In one embodiment: the check valve comprises a positioning piston which can slide and seal the air pressure chamber, an air leakage plug and a third spring, wherein the center of the positioning piston is provided with a second air exhaust hole, the air leakage plug comprises a gasket and a plug column which is convexly arranged at the center of the gasket, the plug column is adapted to extend into the second air exhaust hole, one end of the third spring is propped against the gasket, and the other end of the third spring is propped against the plug relatively.

In one embodiment: the center seat is an exhaust bolt.

In one embodiment: the cup body is adjustably arranged in the center sleeve along the center sleeve; the one-way valve is arranged in the cup body, and the center seat is fixedly connected with the cup body.

In one embodiment: the cup body is adjustably arranged in the center sleeve along the center sleeve, and the adjusting seat penetrates through the plug to be connected with the cup body so as to adjust the axial position of the cup body relative to the center sleeve.

In one embodiment: the cup body is provided with a step for limiting the movement of the positioning piston in a direction approaching to a third spring, and the third spring is propped against the bottom of the cup body and the gasket.

In one embodiment: and a sealing ring is sleeved outside the fixed rod, and the sealing ring forms the exhaust piston.

In one embodiment: the device also comprises a spiral ring which can be fixedly arranged in the central sleeve, the spiral ring is positioned between the spiral sleeve and the exhaust piston, and the screw rod of the fixed rod is in threaded connection with the spiral ring and then in threaded connection with the spiral sleeve.

The second technical scheme adopted by the invention for solving the technical problems is as follows:

the high sealing door pneumatic self-positioning and self-closing hinge comprises a hinge, a fixed seat, a fixed rod and a screw sleeve, wherein the hinge is provided with a shaft sleeve and a blade connected outside the shaft sleeve, the screw sleeve is provided with a thin rod for forming the blade, the screw sleeve is arranged in the fixed seat, the thin rod of the screw sleeve can rotate relative to the fixed rod, and the fixed rod is provided with a screw rod; the cup body and the shaft sleeve are arranged at the interval size positions along the axis and the axial direction and the circumferential direction, and are respectively provided with an inner-outer penetrating row of air inlets; the screw sleeve is fixedly connected in one end of the center sleeve, the plug is fixedly connected in the other end of the center sleeve, and the screw sleeve is spaced from the plug; a fixed rod, a first spring, a center seat, a positioning spring and a positioning piston are arranged between the screw sleeve and the plug in the center sleeve; the screw rod of the fixed rod is in threaded connection with the screw sleeve, the fixed rod is provided with an exhaust piston, and the exhaust piston is in sealed sliding connection in the center sleeve; the first spring is propped between the fixed rod and the center seat, the positioning spring is propped between the center seat and the positioning piston, the positioning piston is arranged in the center sleeve in a sealing way, and a pneumatic chamber is formed between the exhaust piston and the positioning piston; wherein: the exhaust piston moves towards the positioning piston, air in the air pressure chamber is discharged outwards through the first row of air inlets, the cup body and the air outlet holes of the shaft sleeve, and after the exhaust piston slides through the first row of air inlets, the air in the air pressure chamber is discharged outwards through the cup body and the air outlet holes of the shaft sleeve.

In one embodiment: the center seat is an exhaust bolt.

Compared with the background technology, the technical proposal has the following advantages:

the hinge can rotate relative to the axes of the fixed seat and the convex seat after being opened, so that an exhaust piston arranged on a fixed rod in the center sleeve can move downwards towards the one-way valve relative to the spiral sleeve in a spiral manner, gas in the air pressure chamber is discharged outwards through the first row of air inlets, the one-way valve is discharged outwards, and at the moment, the first spring compresses and stores energy; the exhaust piston in the air pressure chamber is outwards discharged through the one-way valve, so that the exhaust piston in the center sleeve can correspond to the one-way valve, the positioning spring, the leakage plug and the first row of air inlets, the air pressure chamber can be formed, the elasticity of the first spring, the self gravity of the first spring and the air pressure (suction force) in the air pressure chamber borne by the fixed rod are balanced in the process, the exhaust piston in the air pressure chamber can correspond to the one-way valve and the positioning spring, the exhaust piston in the air pressure chamber can generate the balance between the atmospheric pressure and the suction force, and the hinge can realize self positioning in the process. The hinge is closed to enable the fixed rod to move upwards spirally relative to the screw sleeve, so that the exhaust piston in the air pressure chamber does not slide out (withdraw) from the first row of air inlet holes from bottom to top in the air pressure chamber, the exhaust piston in the air pressure chamber can correspond to the one-way valve and the positioning spring, in the process, the elastic force, self gravity, air pressure and suction force of the first spring born by the exhaust piston in the air pressure chamber are balanced, the positioning piston can be relatively driven by the suction force of the exhaust piston to generate atmospheric pressure, and is driven from bottom to top and slides from bottom to top until the hinge stops at a preset positioning angle to self-position, meanwhile, the compression energy storage elastic force of the positioning spring changes, one end of the positioning spring can prop against the center seat, and the other end of the positioning spring can prop against the positioning piston to a step propped by the positioning piston, at the same time, when the positioning piston is drawn from bottom to top and slides from bottom to top by the atmospheric pressure generated by the suction force of the exhaust piston, at the same time, the compression energy storage elasticity of the third spring changes, so that one end of the third spring can prop against the cup bottom of the cup body, the other end of the third spring is opposite to the surface peripheral wall of the positioning piston so as to prop against the leakage air and block the leakage air to the surface peripheral wall of the positioning piston, thereby isolating and preventing the outside air from entering the air pressure chamber of the central sleeve from the second exhaust hole, so that the exhaust piston can be self-positioned in the air pressure chamber, the movement can be self-positioned by matching with the hinge in the air pressure chamber at a preset positioning angle before the exhaust piston does not slide from bottom to top through (slide into) the first row of air inlet holes, after the exhaust piston slides out (exits) of the first row of air inlet holes, in the middle of the size, the outside air of the center sleeve enters the air pressure chamber from the first row of air inlets, and meanwhile, the energy storage of the first spring is released to drive the fixing rod to move upwards, and the hinge can realize self-closing. The first row of air inlets are arranged at positions along the axes and the axial direction and the circumferential direction of the central sleeve and the shaft sleeve at intervals, and correspond to the self-positioning of the hinge at the starting point of the positioning angle of a preset positioning angle and the self-closing boundary point below the preset positioning angle, so that the air exhaust piston can correspond to the check valve, the positioning spring, the leakage blocking and the first row of air inlets when the hinge rotates to the starting point of the positioning angle of the preset positioning angle and the self-closing boundary point below the preset positioning angle, and can form an air pressure chamber, so that the hinge can self-position at the starting point of the positioning angle of the preset positioning angle and can self-close below the preset positioning angle, and meanwhile, the air pressure chamber can correspond to and cooperate with the hinge to self-position in the positioning angle of the preset positioning angle, so that the hinge can freely self-position in the positioning angle of the preset positioning angle and can self-close below the preset angle, and correspondingly so that the hinge can freely set the positioning angle.

The adjusting seat can adjust the axial position of the cup body relative to the center sleeve so as to adjust the compression energy storage elasticity of the first spring, the pre-tightening force of the spring and the size of the cavity of the air pressure chamber, and at least the self-closing force and the self-closing speed are adjusted.

Drawings

The invention is further described below with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a hinge according to a first embodiment.

Fig. 2 shows one of the structural schematic diagrams of the hinge according to the first embodiment.

Fig. 3 shows a second schematic structural view of the hinge according to the first embodiment.

Fig. 4 is a schematic structural diagram of a fixing base according to the first embodiment.

Fig. 5 is a schematic diagram showing an assembly structure of a center housing according to the first embodiment.

Fig. 6 is a schematic perspective view of a center sleeve according to the first embodiment.

Fig. 7 is a schematic structural view of a center housing according to the first embodiment.

Fig. 8 is a schematic perspective view of a first bearing according to the first embodiment.

Fig. 9 is a perspective view showing a screw sleeve according to the first embodiment.

Fig. 10 is a schematic structural view of a screw sleeve according to the first embodiment.

Fig. 11 is a perspective view of a spiro ring according to the first embodiment.

Fig. 12 is a schematic structural view of a spiral ring according to the first embodiment.

Fig. 13 is a schematic structural diagram of a fastening screw according to the first embodiment.

Fig. 14 is a schematic perspective view of a fixing rod according to the first embodiment.

Fig. 15 is a schematic structural view of a fixing rod according to the first embodiment.

Fig. 16 is a schematic perspective view of an exhaust plug according to the first embodiment.

Fig. 17 is a schematic diagram showing a structure of an exhaust plug according to the first embodiment.

Fig. 18 is a schematic diagram showing the structure of a positioning piston according to the first embodiment.

Fig. 19 is a schematic perspective view of a positioning piston according to the first embodiment.

Fig. 20 is a schematic perspective view of a leakage blocking in the first embodiment.

Fig. 21 is a schematic view showing the structure of a cup according to the first embodiment.

Fig. 22 is a schematic perspective view of a cup according to the first embodiment.

Fig. 23 is a schematic perspective view of a plug according to the first embodiment.

Fig. 24 is a schematic structural diagram of a plug according to the first embodiment.

Fig. 25 is a schematic structural diagram of an adjusting seat according to the first embodiment.

Fig. 26 is a schematic perspective view of an adjusting seat according to the first embodiment.

Fig. 27 is a schematic structural view of a hinge according to the second embodiment.

Fig. 28 shows a schematic structural view of a blade according to the second embodiment.

Fig. 29 is a schematic structural diagram of a fixing base of the second embodiment.

Fig. 30 is a schematic structural view showing a hinge according to the third embodiment.

Fig. 31 is a schematic structural diagram of a fixing base of the third embodiment.

Fig. 32 shows a schematic structural diagram of a spiro ring according to the third embodiment.

Fig. 33 is a schematic diagram showing the structure of an exhaust plug according to the third embodiment.

Fig. 34 is a schematic view showing the structure of a positioning piston according to the third embodiment.

Fig. 35 is a schematic view showing the structure of a cup according to the third embodiment.

Detailed Description

Example 1

The high sealing door pneumatic self-positioning and self-closing hinge can self-position the hinge by self-closing and any preset angle from 80 degrees preset angle to 180 degrees preset angle when the hinge is opened from 0 degrees to 80 degrees, such as any high sealing flat door hinge and any high sealing convex door hinge which can be suitable for being installed on a refrigerator, a freezer, an oven experiment equipment door, an experiment box door, a simulated environment experiment equipment door, a mechanical equipment door, a drying equipment door, a sound insulation door, a special door, a fresh-keeping warehouse door, a tea warehouse door, a civil warehouse door, any ship and the like.

The hinge, please refer to fig. 1 to 26, includes a hinge 10, a fixing base 20, a fixing rod 30, a threaded sleeve 40, a center sleeve 50, a plug 60 and an adjusting base 70. The central sleeve 50 and the shaft sleeve 11 are respectively provided with a first row of air inlet holes 55 penetrating inside and outside along the axial line and the axial direction at the same circumferential interval size position; the sleeve 11 is provided with a first row of air inlets 55 penetrating inside and outside, which is the first row of air inlets 55 of the auxiliary center sleeve 50 (of course, the sleeve 11 may be provided with no first row of air inlets 55), and the first row of air inlets 55 are arranged at identical positions along the axial and circumferential spacing dimensions of the center sleeve 50 and the sleeve 11.

The hinge 10 comprises a shaft sleeve 11 and blades 12 fixedly connected with the shaft sleeve 11, the fixed seat 20 comprises a fixed plate 25, a vertical bottom plate 22 and a convex seat 23 fixedly connected with the vertical bottom plate 22, and the end face of the vertical bottom plate 22 of the convex seat 23 is concavely provided with a shaft sleeve 21. The center housing 50 is connected to the housing 11 and the housing interior 21, the housing 11 and the housing 21 being disposed side by side such that the hinge is rotatable relative to the housing 21 of the fixed and projecting housing 23 such that the hinge is capable of forming any high seal door pneumatic self-positioning and self-closing flat door structural hinge and any high seal door pneumatic self-positioning and self-closing projecting door structural hinge.

The threaded sleeve 40 is rotatably and non-slidably connected within the central sleeve 50, and the sleeve 11 of the hinge 10 is fixedly connected to the portion of the threaded sleeve 40 extending outside the central sleeve 50, for example: a rotating ring 41 is further disposed, a thin rod 42 is protruding from the upper portion of the threaded sleeve 40, the thin rod 42 can rotate through the rotating ring 41, the rotating ring 41 is adapted to be located on the upper portion of the shaft sleeve 11, a fixing screw 98 is disposed to pass through the shaft sleeve 11 and is fixedly connected into the rotating ring 41 to fixedly connect the rotating ring 41 and the shaft sleeve 11, so as to fixedly connect the shaft sleeve 11 and the thin rod 42 of the threaded sleeve 40 relatively, the rotating ring 41 and the shaft sleeve 11 of the hinge can also limit the axial movement of the threaded sleeve 40, so that the axial and circumferential dimension spacing positions of the rotating and sliding of the threaded sleeve/fixing rod along the axis can be located, and the blade 12 of the matched hinge 10 can be self-located at a preset locating angle relatively. The plug 60 is connected in the center housing 50, and the sleeve 21 of the fixing base and the portion of the plug 60 extending out of the center housing 50 are fixedly connected, for example, by a fixedly connected screw penetrating through the sleeve 21 and fixedly connected into the plug.

The screw sleeve 40 is spaced from the plug 60, and a fixing rod 30, a first spring 81, a center seat 82, a positioning spring 83 and a check valve 90 are arranged between the screw sleeve 40 and the plug 60 in the center sleeve 50. The center housing 50 also has a cup 56 disposed therein, the cup 56 being disposed within the center housing 50 along the axis of the center housing 50 and having an opening at the bottom of the cup. The center seat 82 is an exhaust plug 82. Preferably: the first flange 51 is arranged on the center sleeve 50, the spiral ring 43 is fixedly connected in a non-sliding manner in the center sleeve 50 through the first flange 51, the spiral ring 43 is positioned under the spiral sleeve, the screw rod 31 is screwed through the spiral ring 43 and then is screwed with the spiral sleeve 40, so that the spiral ring 43 can limit and control the screw rod 31 to rotate, slide and move relative to the spiral sleeve 40, and the generated space dimension coefficient is the axial and circumferential dimension space position capable of positioning the spiral sleeve/fixing rod to rotate and slide along the axis, and is the required positioning angle self-positioning relative to ensure the positioning angle of the blade 12 of the matched hinge 10 at the preset setting.

The screw 31 of the fixed rod 30 is in threaded connection with the threaded sleeve 40, and the fixed rod 30 is provided with a vent piston 33, and the vent piston 33 is in sealed sliding connection in the central sleeve 50. The center seat 82 is fixedly connected to the opening of the cup 51 and seals the gap between the cup opening and the center sleeve. The one-way valve 90 is disposed within the cup 56. The first row of air intake holes 55 are located in the moving track of the air exhaust piston along the center sleeve 50, the first row of air intake holes 55 are located at positions spaced along the axial direction and the circumferential direction of the center sleeve and the shaft sleeve 11, and correspond to the self-positioning of the hinge at the starting point of the 90-degree positioning angle of the preset positioning angle and the self-closing boundary point below the 90-degree positioning angle, namely, the hinge rotates to the self-positioning of the starting point of the 90-degree positioning angle of the preset positioning angle, and when the hinge is located at the self-closing boundary point below the 90-degree positioning angle, the air exhaust piston 33 corresponds to the check valve 90, the positioning spring 83, the air leakage plug 92 and the first row of air intake holes, so that an air pressure chamber can be formed, and meanwhile, the air pressure chamber can correspond to and cooperate with the hinge to be self-positioned in the preset positioning angle, so that the hinge can be freely self-positioned in the preset positioning angle of 90-degree positioning angle to 180-degree positioning angle, and can be self-closed below the starting point of the preset positioning angle.

The first exhaust port 55 is disposed along the axial and circumferential dimension spacing between the center housing 50 and the sleeve 11, and the fixed screw rod 42 is screwed into and through the sleeve 11 through the fixed screw 98 after being screwed into the swivel 41, so that the sleeve, swivel and rod are fixedly connected together, the swivel 41 can cooperate with the rotation of the hinge 10 and sleeve 11 to limit the axial movement of the screw housing 40, the screw rod 31 and the screw housing 40 are screwed into and out of the center housing 50 through the fixed screw rod 98 in the sleeve 11 of the hinge 10 to be capable of relative rotational sliding, the screw rod 43 is screwed into and through the center housing 50, the screw rod 31 is screwed into and through the screw rod 43, so that the screw rod 43 can limit and control the rotational sliding and movement of the screw rod 31 relative to the sleeve 40, the generated spacing coefficient can be positioned relative to the axial and circumferential dimension spacing between the fixed screw rod and the screw housing, the screw rod 31 can be rotated and slid along the axis, the second exhaust port 33 can be positioned towards the outside the air inlet port 33 through the air inlet port 90 and the air outlet hole 90, the second exhaust port 33 is positioned through the second exhaust port 90, the second exhaust port 33 is positioned to be capable of one-way valve 33 and the air inlet port 90, the air outlet 90 is positioned towards the air inlet hole 33 is positioned through the corresponding to the air outlet 90, the second exhaust port 33 is arranged at the axial and the air outlet 90, the exhaust piston in the air pressure chamber can generate air pressure and (suction force) balance, and the positioning angle position of the hinge 10 blade 12 can be freely preset by the hinge blade 12.

The first spring 81 of the inner core 50 is propped between the fixed rod 30 and the center seat 82, the positioning spring 83 is propped between the center seat 82 and the one-way valve 90, the one-way valve 90 is arranged in the cup 56 in a sealing way and is propped against the cup 56, and the air pressure chamber can be formed by the air discharge piston 33, the one-way valve 90, the positioning spring 83 and the first row of air inlet holes 55. Wherein the check valve 90 is the positioning piston 91. Wherein: the exhaust piston 33 of the fixed rod 30 moves towards the one-way valve 90, and at the same time, the air in the air pressure chamber is discharged outwards through the first exhaust hole 55 and is discharged outwards through the exhaust bolt and the second exhaust hole 911 of the one-way valve, and at the moment, the first spring compresses and stores energy; the hinge 10 continues to rotate relative to the shaft sleeve 21 of the fixed seat and the boss 23 through opening, so that the exhaust piston 33 of the fixed rod 30 in the shaft sleeve 11 can continuously slide downwards in a spiral manner relative to the screw sleeve, at the same time, after the exhaust piston 33 slides over the first exhaust hole 55, air in the air pressure chamber is exhausted outwards through the exhaust bolt and the second exhaust hole 911 of the check valve 90, so that the exhaust piston 33 in the center sleeve can correspond to the check valve 90, the air leakage block 92, the positioning spring 83 and the first exhaust hole 55, and can form an air pressure chamber, during the process, the elastic force and the self gravity of the first spring 81 borne by the fixed rod, and the exhaust piston 33 in the air pressure chamber can be matched with the positioning piston 91 and the positioning spring 83, so that the exhaust piston 33 in the air pressure chamber can generate balance between the air pressure and (suction force), and the hinge 10 can realize self-positioning, so that the exhaust piston 33 can be matched with the positioning piston 91 and the positioning spring 83, suction force and the atmospheric pressure can be generated in the air pressure chamber, and the hinge 33 can be self-positioned at a preset positioning angle relative to the blade 12 of the air pressure chamber mobility in the air pressure chamber. The blade 12 of the hinge 10 is closed by external force, so that the screw rod in the shaft sleeve and the screw sleeve are matched to relatively rotate, the exhaust piston 33 generates suction force and atmospheric pressure as long as the exhaust piston 33 is from bottom to top before passing through the first row of air inlet holes 55, the positioning piston 91 is relatively driven from bottom to top by the atmospheric pressure generated by the suction force of the exhaust piston 33, the blade 12 of the hinge 10 stops at a preset positioning angle for self positioning, at the same time, the compression energy storage elastic force of the positioning spring 83 changes, one end can prop against the center seat 82, the other end can prop against the positioning piston 91 to the step 561 propped against the positioning piston 91, at the same time, the compression energy storage elastic force of the third spring 93 changes, so that one end of the third spring can prop against the cup bottom of the cup body, the other end can prop against the plug 92 and the gasket 921 and the plug 922 to reset to the surface of the positioning piston 91 (one-way valve) 90, and the air is prevented from entering the second peripheral wall from inside the chamber, so that the air can be positioned at the preset air pressure inside the air outlet hole of the hinge 33. The more the energy storage elastic force and the spring pretightening force of the positioning spring 83 are stronger, the stronger the elastic force of the positioning piston 91 propped against the opposite end is relatively, the other end of the positioning spring is propped against the center seat, so that before the exhaust piston 33 does not slide (exit) from the bottom to the top through the first row of air inlets 55, the strength of the air pressure and the suction force born by the air pressure chamber is relatively stronger, the stronger the positioning force of the self-positioning of the blade 12 of the hinge 10 in a preset positioning angle is relatively stronger, after the exhaust piston 91 slides (exits) from the bottom to the top through the first row of air inlets 55, the air outside the center sleeve 50 and the sleeve enters the air pressure chamber from the first row of air inlets 55, the air pressure and the suction force are relatively lost in the air pressure chamber, so that the blade of the hinge loses the self-positioning function, meanwhile, the energy storage of the first spring 81 is released, so that the fixed rod 30 is driven to move upwards, and the hinge can realize self-closing. In the condition that the first spring 81 is not arranged in the central sleeve of the hinge, the hinge can still preset the positioning angle for self-positioning.

One specific structure is as follows: the check valve 90 includes a positioning piston 91 slidably connected to and sealing the wall of the cup 56 of the air pressure chamber, an air leakage block 92 and a third spring 93, the positioning piston 91 has a second air outlet hole 911 at the center, the air leakage block 92 includes a gasket 921 and a block column 922 protruding from the center of the gasket, the block column 922 is adapted to extend into the second air outlet hole 911, one end of the third spring 93 abuts against the gasket 921, and the other end abuts against the bottom of the cup 56. The cup 56 is provided with a step 561 against which the positioning piston 91 is supported for restricting the positioning piston 91 from moving closer to the third spring 93. The check valve 90 is a positioning piston 91. The end surface of the second exhaust hole 911 is concavely arranged in a taper hole from large to small relative to the direction of the gasket 921, and in order to ensure sealing performance, preferably, an annular mounting groove 913 is concavely arranged on the outer rotating surface of the positioning piston, a leak-proof sealing ring 912 is arranged in the mounting groove, and the leak-proof sealing ring 912 also extends out of the mounting groove 913, so that the sealing ring 912 is in sliding sealing contact with the cup wall of the cup 56, thereby isolating and preventing outside air from entering the air pressure chamber of the center sleeve from the cup wall of the cup 56. When the vent piston 33 slides spirally downwards, the gas in the air pressure chamber presses the peripheral wall of the second vent hole 911, so that a gap is generated between the peripheral wall of the second vent hole 911 and the blocking column 922, the gas is discharged through the gap between the peripheral wall of the second vent hole 911 and the blocking column 922, the gasket 921 and the blocking column 922 are pushed back by the discharged gas, so that a gap is generated between the gasket 921 and the bottom wall of the positioning piston 91, the gas is discharged through the gap between the gasket 921 and the bottom wall of the positioning piston 91, and after the gas is discharged, one end of the third spring can be propped against the bottom of the cup body under the action of the energy storage elasticity and self elasticity of the third spring 93, and the other end of the third spring is opposite to be propped against the gasket 921 and the blocking column 922 to be reset to the surface peripheral wall of the positioning piston, so that external air is isolated and prevented from penetrating into the air pressure chamber from the second vent hole 911. The check valve 90 is a positioning piston 91.

The fixing rod 30 further comprises a convex ring 32 fixedly connected to the end of the screw 31, the convex ring 32 is concavely provided with an annular mounting groove 321, a leakage-proof sealing ring is sleeved in the annular mounting groove 321, the leakage-proof sealing ring 322 also extends out of the mounting groove 321 to be in sealing sliding connection with the center sleeve so as to isolate and prevent external air from penetrating into the air pressure chamber in the center sleeve, so that the air pressure chamber can be formed, and the leakage-proof sealing ring forms the exhaust piston 33. The rod may also be held against a slide (e.g., directly against or pivotally connected to the slide via a pivot) as desired, the slide being configured as a vent piston.

The adjusting seat 70 penetrates through the plug to be connected with the cup body so as to adjust the axial position of the cup body relative to the central sleeve, so as to adjust the energy storage elasticity and pretightening force of the first spring and the size of the cavity of the air pressure chamber, and realize the adjustment of the self-closing strength and the self-closing speed. The adjusting seat 70 is a screw rod, the screw rod passes through the plug in a threaded manner and is connected with the cup bottom of the cup body, if the screw rod is provided with a step surface, the step surface abuts against the bottom surface of the cup bottom of the cup body, the screw rod can pass through the opening of the cup bottom in a rotating manner, and a nut is additionally arranged to be fixedly connected with the tail end of the screw rod in a threaded manner and abut against the top surface of the cup bottom of the cup body.

According to the requirement, the screw rod fixing device can further comprise a spiral ring 43 fixedly arranged in the center sleeve, the spiral ring 43 is positioned between the exhaust pistons of the screw sleeves, the spiral ring is abutted under the screw sleeves, and the screw rod of the fixing rod is in threaded connection with the screw sleeve after penetrating through the spiral ring. (of course, the spiral ring 43 may not be provided in the center cover or the spiral ring 43 may be provided).

In this embodiment: a first flange 51 is provided on the center housing 50, and the spiral ring 43 is connected and fixed in a non-rotatable and slidable manner in the center housing 50 by the first flange 51; a first bearing 44 is arranged between the screw sleeve 40 and the center sleeve 50 (the first bearing 44 is axially limited and fixedly connected by a third flange 53 sleeved on the center; a second bearing 84 is provided between the bottom end surface of the fixed rod 30 and the first spring 81 (of course, the second bearing 84 may not be provided or may be provided); the center housing 50 is provided with a second flange 52, and the plug is connected and fixedly connected in the center housing by the second flange 52 in a manner of being unable to rotate and slide relative to each other. The exhaust bolt 82 comprises a base 821, a third exhaust hole 822 is formed in the base 821, a horn 823 is fixedly arranged below the base 821, the base 821 is supported on the periphery of a cup mouth of the cup body, the horn 823 is positioned in the cup body, the third exhaust hole 822 is communicated with an inner hole of the horn 823, and the third exhaust hole 822 is concavely formed in a taper shape from large to small at one end of the base facing the horn body; the base 821 is sealed against the center housing, and preferably, an annular mounting groove 811 is recessed in the peripheral surface of the base 821, a leak-proof seal 824 is mounted in the mounting groove 811, and the seal 824 extends out of the mounting groove 811 to be sealed against the center housing 50 to isolate and prevent outside air from penetrating into the air pressure chamber of the center housing. 322. 824, 912, 562 are made of elastic material, or elastic material. An annular mounting groove 560 is concavely arranged on the peripheral surface of the outer rotary surface of the cup wall of the cup body 56, a leak-proof sealing ring 562 is sleeved on the mounting groove 560, and the leak-proof sealing ring 562 also extends out of the mounting groove 560 so as to isolate and prevent outside air from entering the air pressure chamber of the center sleeve.

Wherein: the blade 12 of the hinge 10 can be opened by external force to rotate relative to the shaft sleeve 21 of the fixed seat 20 and the convex seat 23, so that the exhaust piston 33 of the fixed rod 30 moves downwards in a spiral way towards the one-way valve 90, gas in the air pressure chamber is discharged outwards through the first row of air inlet holes 55 and is discharged outwards through the second row of air outlet holes 911 of the one-way valve, and at the moment, the first spring compresses and stores energy; the blades 12 of the hinge 10 continue to rotate relative to the shaft sleeve 21 provided on the fixed seat 20 and the convex seat 23 through opening, so that the exhaust piston provided on the fixed rod 30 in the shaft sleeve 11 slides downwards to slide through the first row of air inlets 55, and at the same time, the air in the air pressure chamber is discharged outwards through the second air outlet 911 of the one-way valve, so that the exhaust piston in the center sleeve 50 can correspond to the one-way valve, the positioning spring, the air leakage plug 92 and the first row of air inlets, so that the air pressure chamber can be formed, the elasticity of the first spring, the self gravity of the fixed rod and the air pressure (suction force) of the air pressure chamber are balanced, and the exhaust piston in the air pressure chamber can correspond to the positioning piston, the positioning spring, the air leakage plug and the first row of air inlets 55, so that the air pressure and the air leakage plug in the air pressure chamber generate the air pressure balance, and the air suction force are balanced, and the hinge realizes self positioning in the process. Before the hinge is closed and rotated relative to the shaft sleeve axis of the boss of the fixed seat by external force, so that the exhaust piston 33 of the fixed rod in the shaft sleeve 11 does not slide out (withdraw) from the first exhaust hole from bottom to top in the air pressure chamber, the exhaust piston in the air pressure chamber can correspond to the positioning piston and the positioning spring, in the process, the elasticity, self gravity, air pressure and (suction force) of the first spring acted by the exhaust piston of the fixed rod in the air pressure chamber are balanced, the positioning piston is relatively driven from bottom to top and slides from bottom to top by the atmospheric pressure generated by the suction force of the exhaust piston, the compression energy storage elastic force of the positioning spring changes after the hinge blade stops being positioned at a preset angle, one end can prop against the central seat, the other end can prop against the step propped against the positioning piston (one-way valve) by the positioning piston, and the third spring can change when the positioning piston is driven from bottom to top and slides up from bottom by the atmospheric pressure generated by the exhaust piston (suction force), so that the third spring can prop up from bottom to top to bottom, and the air cylinder can be prevented from being blocked by the piston from being matched with the air pressure cylinder piston to bottom when the other end is pushed out of the air pressure chamber, and the air cylinder is blocked by the air cylinder is stopped from the air cylinder is stopped at one end, and the air cylinder is prevented from being matched with the air cylinder bottom to the air cylinder is opposite to the air cylinder is positioned at the air cylinder. The more the energy storage elasticity of the positioning spring in the air pressure chamber and the intensity of the pre-tightening force of the spring are strong, the stronger the propping elastic force of the positioning piston propped against the opposite end is, the opposite end of the positioning spring is propped against the center seat, so that the positioning piston in the air pressure chamber is pumped up by the exhaust piston from bottom to top and slides from bottom to top, the stronger the intensity of the atmospheric pressure generated by the suction force of the exhaust piston in the air pressure chamber is, and the stronger the positioning force of the hinge blade in the preset angle is. The hinge can rotate relative to the fixed seat through external force closing, the exhaust piston can realize self-positioning before sliding from bottom to top through the exhaust air inlet, after the exhaust piston slides out (exits) of the first row of air inlet, the outside air of the center sleeve enters the air pressure chamber from the first row of air inlet in the middle of the dimension, the air pressure and the suction force are relatively lost in the air pressure chamber, so that the hinge loses the self-positioning function, meanwhile, the energy storage of the first spring is released, so that the fixed rod can be driven to move upwards, and the hinge can realize self-closing.

Wherein: when the hinge blade is required to be positioned at a preset positioning angle, the shaft sleeve, the swivel and the thin rod are fixedly connected together through the screw when the hinge blade is opened, the swivel 41 can limit the axial movement of the screw sleeve 40 so as to position the axial and circumferential dimension positions of the screw sleeve/fixed rod along the axis to rotate and slide, the screw rod in the shaft sleeve of the hinge and the screw sleeve are matched in a threaded manner to rotate relatively, the first row of air inlet holes are arranged at the axial and circumferential spacing dimension positions on the central sleeve and the shaft sleeve, and the exhaust piston in the central sleeve can correspond to the check valve and the positioning spring to form an air pressure chamber so that the air pressure and (suction force) generated by the exhaust piston in the air pressure chamber are balanced, the air pressure generated by the suction force of the exhaust piston relatively causes the positioning piston to be pumped up from bottom to top, and the positioning angle of the hinge blade can be ensured to be freely preset, and the hinge blade can be self-positioned at the preset positioning angle. The more powerful the compression energy storage elastic force of the positioning spring and the strength of the spring pretightening force are, the stronger the propping elastic force of the positioning piston 91 propped against the opposite end must be, and the other end of the positioning spring is propped against the center seat, so that the positioning force of the hinge blade at a preset angle for self-positioning must be stronger relatively. The compression energy storage elastic force and the spring pre-tightening force strength of the positioning spring are ensured to be larger than those of the first spring and the third spring, so that the hinge blade can realize self-positioning at any positioning angle from 80 degrees to 180 degrees in preset settings.

Wherein: the central sleeve of the hinge can form an air pressure chamber, and the necessary conditions for freely and predefining the positioning angle are the following circulation movement flow details, when the hinge blade is opened, the hinge blade is screwed into the fixed thin rod 42 penetrating through the shaft sleeve 11 and then screwed through the rotating ring 41 through the fixed screw 98, so that the rotating ring 41 can be matched with the rotation of the hinge 10 and the shaft sleeve 11 to limit the axial movement of the screw sleeve 40, the axial and circumferential dimension positions relatively capable of positioning the screw sleeve/the fixed rod to rotate and slide along the axis, the screw rod in the shaft sleeve of the hinge and the screw sleeve are matched through the screw joint of the screw rod and the screw sleeve to enable the screw rod to rotate relative to the screw sleeve, the fixed rod in the shaft sleeve can also rotate and slide relative to the axis when rotating relative to the screw sleeve, the first spring 81 in the central sleeve is propped between the bottom end face of the fixed rod 30 and the central seat 82, and the positioning spring 83 is propped between the central seat 82 and the one-way valve 90, and is sealingly disposed in the cup 56 and is abutted against the cup 56 by the check valve 90, and is provided with a first flange 51 by the center sleeve 50, and is fixedly connected with the spiral ring 43 by the first flange 51 in the center sleeve 50 in a non-sliding manner, and is provided with a position by the first row of air intake holes 55 along the axial and circumferential dimension of the center sleeve, and is sleeved with a leak-proof sealing ring by the outer rotary surface of the cup wall of the cup, and is sleeved with a sealing ring by the fixing rod, the sealing ring forms the exhaust piston, and is fixedly connected with the opening of the cup 51 by the center seat 82 and seals the gap between the opening of the cup and the center sleeve, and is fixedly connected with the center sleeve by the second flange 52 in a non-sliding manner by the second flange 52, and the boss 23 has a shaft sleeve 21 and a part of the plug 60 extending out of the center sleeve 50 are connected, and one end of the third spring is propped against the gasket and the air leakage plug 92, and the other end of the third spring can be propped against the bottom of the cup body, so that the hinge blade can rotate relative to the shaft sleeve arranged on the boss of the fixed seat when being opened, the exhaust piston arranged on the fixed rod can move downwards towards the one-way valve 90 relative to the spiral sleeve, meanwhile, the air in the air pressure chamber is discharged outwards through the first row of air inlet holes, the first spring compresses and stores energy, the hinge continues to rotate relative to the shaft sleeve arranged on the fixed seat and the boss in the axial direction, and after the exhaust piston slides through the position of the first row of air inlet holes, the air in the air pressure chamber is discharged outwards through the second air outlet holes of the one-way valve, so that the air pressure chamber can be formed. Wherein: the central sleeve and the shaft sleeve are provided with a first row of air inlets which penetrate through the central sleeve and the shaft sleeve along the axial line, the axial direction and the circumferential direction at the size interval positions, so that the exhaust piston can correspond to the one-way valve and the air leakage blocking and positioning spring and the first row of air inlets to form an air pressure chamber; the first row of air inlets are arranged at intervals along the axial direction and the circumferential direction of the central sleeve and the shaft sleeve, the corresponding hinge is self-positioned at a 90-degree positioning angle starting point of a preset positioning angle, and a limiting point capable of self-closing under the 90-degree positioning angle, namely, the hinge rotates to the 90-degree positioning angle starting point of the preset positioning angle to self-position, and when the hinge is self-closing under the 90-degree positioning angle, the air outlet piston can correspond to the check valve, the positioning spring and the air leakage plug and the first row of air inlets to form an air pressure chamber, and meanwhile, the air pressure chamber can correspond to and cooperate with the hinge to self-position in the preset positioning angle, so that the hinge can be freely positioned in the preset positioning angle of 90-180 degrees, and can self-close under the preset positioning angle of 90-degree, and the hinge can freely preset positioning angle.

Example two

It differs from the embodiment in that: fig. 27 to 29 show a hinge 10, a fixing base 20, a fixing rod 30, a screw sleeve 40, a center sleeve 50, a plug 60 and an adjusting base 70. The fixing base 20 has a vertical bottom plate 22 of a fixing plate 25 provided with a boss 23, and a boss 21 is concavely provided on an end surface of the boss 23, the boss 23 occupies about half of the fixing plate 25, and the boss 11 of the hinge 10 is located above the boss 23. The central sleeve 50 and the shaft sleeve 11 are respectively provided with a first row of air inlet holes 55 which penetrate through the inside and outside along the axial line, the axial direction and the circumferential space dimension position; the sleeve 11 is provided with a first row of air intake holes 55 penetrating inside and outside, which is the first row of air intake holes 55 of the auxiliary center sleeve 50 (of course, the sleeve 11 may be provided without the first row of air intake holes 55), and the first row of air intake holes 55 are arranged at identical positions along the axes and the axial and circumferential dimension intervals of the center sleeve 50 and the sleeve 11. The hinge 10 comprises a shaft sleeve 11 and a blade 12 fixedly connected with the shaft sleeve 11, the fixed seat 20 comprises a vertical bottom plate 22 and a convex seat 23 fixedly connected with the vertical bottom plate 22, and the end face of the vertical bottom plate 22 of the convex seat 23 is concavely provided with a shaft sleeve 21. The center housing 50 is connected to the housing 11 and the housing interior 21, and the housing 11 and the housing 21 are disposed side by side such that the hinge 10 and the blade 12 can rotate relative to the housing 21 of the fixed base 20 and the boss 23, such that the hinge can form any high-tightness door pneumatic self-positioning and self-closing flat door structural hinge, and any high-tightness door pneumatic self-positioning and self-closing boss door structural hinge.

The threaded sleeve 40 is rotatably and non-slidably connected within the central sleeve 50, and the sleeve 11 of the hinge 10 is fixedly connected to the portion of the threaded sleeve 40 extending outside the central sleeve 50, for example: a rotating ring 41 is further disposed, a thin rod 42 is protruding from the upper portion of the threaded sleeve 40, the thin rod 42 can rotate through the rotating ring 41, the rotating ring 41 is adapted to be positioned on the upper portion of the shaft sleeve 11, a fixing screw 98 is disposed to pass through the shaft sleeve 11 and is fixedly connected into the rotating ring 41 to fixedly connect the rotating ring 41 and the shaft sleeve 11, so as to fixedly connect the shaft sleeve 11 and the thin rod 42 of the threaded sleeve 40 relatively, the rotating ring 41 and the shaft sleeve 11 can also limit the axial movement of the threaded sleeve 40, so that the axial and circumferential dimension spacing positions of the threaded sleeve/fixing rod along the axial rotation and sliding can be positioned relatively to ensure the required positioning angle positioning of the blade 12 of the matched hinge 10 at the preset positioning angle. The plug 60 is connected and fastened in the central sleeve 50 by means of the second flange 52 such that the plug cannot slide relative to one another, the sleeve 21 of the fastening seat being fastened to the portion of the plug 60 extending outside the central sleeve 50, for example by means of fastening screws which pass through the sleeve 21 and are fastened into the plug 60.

The screw sleeve 40 is spaced from the plug 60, and a fixing rod 30, a first spring 81, a center seat 82, a positioning spring 83 and a check valve 90 are arranged between the screw sleeve 40 and the plug 60 in the center sleeve 50. The center housing 50 also has a cup 56 disposed therein, the cup 56 being disposed within the center housing 50 along the axis of the center housing 50 and having an opening at the bottom of the cup. The center seat 82 is an exhaust plug 82. Preferably: the first flange 51 is arranged on the center sleeve 50, the spiral ring 43 is fixedly connected in a non-sliding manner in the center sleeve 50 through the first flange 51, (the spiral ring 43 is not required to be arranged in the center sleeve), the spiral ring 43 is positioned under the spiral sleeve, the screw 31 is screwed through the spiral ring 43 and then is screwed with the spiral sleeve 40, so that the spiral ring 43 can limit and control the screw 31 to rotationally slide and move relative to the spiral sleeve 40, and the generated interval dimension coefficient can position the spiral sleeve/fixed rod along the axis rotation axis and the sliding direction and circumferential dimension interval position, and can relatively ensure that the blades 12 of the matched hinge 10 can be self-positioned at a preset positioning angle. In the condition that the first spring 81 is not arranged in the central sleeve of the hinge, the hinge can still preset the positioning angle for self-positioning.

Wherein: the first row of air inlet holes 55 are arranged along the axial and circumferential dimension spacing positions of the central sleeve 50 and the shaft sleeve 11, and the fixed thin rod 42 is screwed into the shaft sleeve 11 through the fixed screw 98 and then screwed through the swivel 41, so that the shaft sleeve, the swivel and the thin rod are fixedly connected together, the swivel 41 can be matched with the rotation of the hinge 10 and the shaft sleeve 11 to limit the axial movement of the screw sleeve 40, the axial and circumferential dimension spacing positions of the screw sleeve/the fixed rod which can rotate and slide along the axial line are matched with the screw 31 in the shaft sleeve 11 of the hinge 10 and the screw sleeve 40 to be matched with each other in a relative rotation sliding manner, the spiral ring 43 is fixedly connected in the central sleeve 50 through the first flange 51 in a non-sliding manner, the spiral ring 43 is positioned under the screw sleeve, the screw rod 31 is screwed through the spiral ring 43 and then screwed into the screw sleeve 40, so that the spiral ring 43 can limit and control the rotation, sliding and moving of the screw 31 relative to the screw sleeve 40, the generated space size coefficient can position the axial and circumferential size space positions of the screw sleeve/fixed rod along the axis rotation and sliding, so that the exhaust piston 33 of the fixed rod 30 in the center sleeve 50 can rotate relative to the screw sleeve 40, so that the exhaust piston 33 of the fixed rod generates fixed axial and circumferential size space spiral downwards to the one-way valve 90, at the same time, the gas in the air pressure chamber is discharged outwards through the first exhaust hole 55, the second exhaust hole 911 of the one-way valve 90 is discharged outwards, the exhaust piston of the fixed rod in the shaft sleeve of the hinge continues to slide downwards relative to the screw sleeve axis spiral, at the position of sliding through the first exhaust hole 55, at the same time, the gas in the air pressure chamber is discharged outwards through the second exhaust hole 911 of the one-way valve 90, so that the exhaust piston 33 in the center sleeve can correspond to the check valve 90, the positioning spring 83, the air leakage plug 92 and the first row of air inlets 55 to form an air pressure chamber, and the exhaust piston in the air pressure chamber can generate air pressure and balance (suction force), thereby ensuring that the hinge blade 12 can freely preset the positioning angle position of the hinge 10 blade 12.

The screw 31 of the fixed rod 30 is in threaded connection with the threaded sleeve 40, and the fixed rod 30 is provided with a vent piston 33, and the vent piston 33 is in sealed sliding connection in the central sleeve 50. The center seat 82 is fixedly connected to the opening of the cup 51 and seals the gap between the cup opening and the center sleeve. The one-way valve 90 is disposed within the cup 56. The first row of air inlets 55 are arranged at intervals along the axial direction and the circumferential direction of the center sleeve and the shaft sleeve, are positioned in the movable track of the air exhaust piston along the center sleeve, the first row of air inlets 55 are arranged at intervals along the axial direction and the circumferential direction of the center sleeve and the shaft sleeve, the corresponding hinge is self-positioned at the starting point of the 90-degree positioning angle of the preset positioning angle, and the self-closing boundary point below the 90-degree positioning angle, namely, when the hinge rotates to the boundary point of the 90-degree positioning angle of the preset positioning angle and the self-closing boundary point below the 90-degree positioning angle, the air exhaust piston can correspond to the check valve 90, the air leakage plug 92 and the positioning spring 83 to form an air pressure chamber, and meanwhile, the air pressure chamber can correspond to and cooperate with the hinge to be positioned in the preset positioning angle, so that the hinge can be positioned freely in the preset positioning angle of 90-180 degrees and can be self-closed below the 90-degree positioning angle, and the hinge can be positioned freely at the preset positioning angle.

One specific structure is as follows: the check valve 90 includes a positioning piston 91 slidably connected to and sealing the wall of the cup 56 of the air pressure chamber, an air leakage block 92 and a third spring 93, the positioning piston 91 has a second air outlet hole 911 at the center, the air leakage block 92 includes a gasket 921 and a block column 922 protruding from the center of the gasket, the block column 922 is adapted to extend into the second air outlet hole 911, one end of the third spring 93 abuts against the gasket 921, and the other end abuts against the bottom of the cup 56. The cup 56 is provided with a step 561 against which the positioning piston 91 is supported for restricting the positioning piston 91 from moving closer to the third spring 93. The check valve 90 is a positioning piston 91. The end surface of the second exhaust hole 911 is concavely provided with a taper hole from large to small relative to the direction of the gasket 921, and in order to ensure sealing performance, preferably, the outer rotary surface of the positioning piston is concavely provided with an annular mounting groove 913, a leak-proof sealing ring 912 is arranged in the mounting groove, and the leak-proof sealing ring 912 also extends out of the mounting groove 913, so that the sealing ring 912 is in sliding sealing contact with the wall of the cup 56. When the exhaust piston 33 rotates downwards, the gas in the air pressure chamber presses the peripheral wall of the second exhaust hole 911, so that a gap is generated between the peripheral wall of the second exhaust hole 911 and the blocking column 922, the gas is discharged through the gap between the peripheral wall of the second exhaust hole 911 and the blocking column 922, the gasket 921 and the blocking column 922 are pushed back by the discharged gas, so that a gap is generated between the gasket 921 and the bottom wall of the positioning piston 91, the gas is discharged through the gap between the gasket 921 and the bottom wall of the positioning piston 91, and after the gas is discharged, one end of the third spring can prop against the cup bottom of the cup body under the action of the energy storage elasticity and self elasticity of the third spring 93, and the other end of the third spring can prop against the gasket 921 and the blocking column 922 to return to the surface peripheral wall of the positioning piston, so that external air is isolated and prevented from penetrating into the air pressure chamber from the second exhaust hole. The one-way valve is a positioning piston.

The fixing rod 30 further comprises a convex ring 32 fixedly connected to the end of the screw 31, the convex ring 32 is concavely provided with an annular mounting groove 321, a leak-proof sealing ring is sleeved in the annular mounting groove 321, the leak-proof sealing ring 322 also extends out of the mounting groove 321 to be in sealing sliding connection with the central sleeve 50, and the leak-proof sealing ring forms the exhaust piston 33. The rod may also be held against a slide (e.g., directly against or pivotally connected to the slide via a pivot) as desired, the slide being configured as a vent piston.

The adjusting seat 70 penetrates through the plug to be connected with the cup body, so that the axial position of the cup body relative to the center sleeve can be adjusted, the energy storage elasticity and the pretightening force of the first spring and the size of the cavity of the air pressure chamber can be correspondingly adjusted, and the self-closing force and the self-closing speed can be adjusted. The adjusting seat 70 is a screw rod, the screw rod passes through the plug in a threaded manner and is connected with the cup bottom of the cup body, if the screw rod is provided with a step surface, the step surface abuts against the bottom surface of the cup bottom of the cup body, the screw rod can pass through the opening of the cup bottom in a rotating manner, and a nut is additionally arranged to be fixedly connected with the tail end of the screw rod in a threaded manner and abut against the top surface of the cup bottom of the cup body.

In this embodiment: a first flange 51 is provided on the center housing 50, and the spiral ring 43 is connected and fixedly connected in a non-sliding manner in the center housing 50 through the first flange 51; a first bearing 44 is arranged between the screw sleeve 40 and the center sleeve 50 (the first bearing 44 is axially limited and fixedly connected by a third flange 53 sleeved on the center; a second bearing 84 is provided between the bottom end surface of the fixed rod 30 and the first spring 81 (of course, the second bearing 84 may not be provided); the center housing 50 is provided with a second flange 52, and the plug is connected and fixed in the center housing by the second flange 52 so as not to relatively slide. The exhaust bolt 82 comprises a base 821, a third exhaust hole 822 is formed in the base 821, a horn 823 is fixedly arranged below the base 821, the base 821 is supported on the periphery of a cup mouth of the cup body, the horn 823 is positioned in the cup body, the third exhaust hole 822 is communicated with an inner hole of the horn 823, and the third exhaust hole is concavely formed from one end of the base to the horn body in a taper shape from large to small; the base 821 is sealed against the center housing, and preferably, an annular mounting groove 811 is recessed in the peripheral surface of the base 821, a leak-proof seal 824 is mounted in the mounting groove 811, and the seal 824 extends out of the mounting groove 811 to be sealed against the center housing 50. The center seat 82 and cup 56 are coupled together by a set screw 98. 322. 824, 912, 562 are made of elastic material, or elastic material. An annular mounting groove 560 is concavely arranged on the peripheral surface of the outer rotary surface of the cup wall of the cup body 56, a leak-proof sealing ring 562 is sleeved on the mounting groove 560, and the leak-proof sealing ring 562 also extends out of the mounting groove 560 so as to isolate and prevent outside air from entering the air pressure chamber of the center sleeve.

The hinge can rotate relative to the shaft sleeve 21 of the fixed seat 20 and the convex seat 23 after being opened, so that the fixed rod in the center sleeve can move downwards towards the one-way valve 90 relative to the spiral sleeve in a spiral manner, and meanwhile, the gas in the air pressure chamber is discharged outwards through the first row of air inlet holes, the second air outlet hole 911 of the one-way valve is discharged outwards, and at the moment, the first spring compresses and stores energy; the hinge fixing rod continuously rotates and slides downwards in a spiral manner relative to the axis of the screw sleeve, so that the exhaust piston in the air pressure chamber slides through the first row of air inlet holes, and meanwhile, air in the air pressure chamber is exhausted outwards through the second air outlet hole 911 of the one-way valve, so that the exhaust piston in the center sleeve can correspond to the one-way valve, the positioning spring, the air leakage plug 92 and the first row of air inlet holes 55, the air pressure chamber can be formed, the elasticity of the first spring, the self gravity of the first spring, the air pressure (suction force) in the air pressure chamber borne by the fixing rod are balanced in the process, and the exhaust piston in the air pressure chamber can correspond to the one-way valve, the air leakage plug 92 and the positioning spring, so that the exhaust piston in the air pressure chamber can generate balance between atmospheric pressure and suction force, and the hinge can realize self positioning in the process. The hinge is closed to enable the fixed rod to move upwards relative to the screw sleeve in a spiral way, so that before the exhaust piston does not slide out (withdraw) of the first row of air inlet holes from bottom to top in the air pressure chamber, the exhaust piston in the air pressure chamber corresponds to the one-way valve, the positioning spring, the air leakage blockage and the first row of air inlet holes, in the process, the elastic force, self gravity, air pressure and (suction force) of the first spring borne by the exhaust piston in the fixed rod in the air pressure chamber balance, the positioning piston can be relatively driven by the air pressure generated by the air suction force of the exhaust piston, and is driven from bottom to top and slides upwards, until the hinge stops at a preset positioning angle, meanwhile, the compression energy storage elastic force of the positioning spring changes, one end can prop against the center seat, the other end can prop against the positioning piston to the step propped by the positioning piston, and the third spring changes in the compression energy storage elastic force of the third spring when the positioning piston is driven from bottom to top and slides upwards, one end can prop the cup bottom of the other end to top of the cup body, the other end can prop the positioning piston to the air leakage piston is matched with the air inlet hole (921) from bottom to the air inlet hole in the air pressure chamber, and the air pressure chamber is positioned at the preset positioning angle, and the air pressure chamber is closed, and the air leakage piston can be matched with the air pressure chamber to the air leakage piston can be positioned outside the air inlet hole. The stronger the energy storage elasticity and the pretightening force of the positioning spring in the air pressure chamber are, the stronger the propping elastic strength of the positioning piston propped against by the opposite end is, the opposite end of the positioning spring is propped against the center seat, so that the positioning piston in the air pressure chamber is pumped up by the exhaust piston from bottom to top and slides from bottom to top, the stronger the strength of the atmospheric pressure generated by the suction force of the exhaust piston in the air pressure chamber is, and the stronger the strength of the hinge blade is. Before the exhaust piston does not pass through the first row of air inlets from bottom to top, the hinge can realize self-positioning, after the exhaust piston slides out (exits) of the first row of air inlets, outside air of the center sleeve enters the air pressure chamber from the first row of air inlets in the middle of the dimension, the air pressure chamber loses the air pressure and the suction force relatively, so that the blades 12 of the hinge 10 lose the self-positioning function, meanwhile, the energy storage of the first spring is released to drive the fixed rod to move upwards, and the hinge can realize self-closing.

The adjusting seat can adjust the axial position of the cup body relative to the central sleeve, so that the compression energy storage elastic force of the first spring, the pre-tightening force of the spring and the size of the cavity of the air pressure chamber can be adjusted, and at least the self-closing force and the self-closing speed are adjusted.

Wherein: the central sleeve of the hinge can form an air pressure chamber, and the necessary conditions for freely and predefining the positioning angle are the following circulation movement flow details, when the hinge blade is opened, the fixing screw 98 is screwed into the through sleeve 11 and then is screwed through the swivel 41 to lock the fixing thin rod 42, so that the swivel 41 can be matched with the rotation of the hinge 10 and the sleeve 11 to limit the axial movement of the screw sleeve 40, the first flange 51 is arranged through the central sleeve 50, the screw 43 is fixedly connected in the central sleeve 50 and can not slide through the screw joint cooperation of the screw rod in the sleeve of the hinge and the screw sleeve, so that the screw rod can rotate relative to the screw sleeve, the fixing rod in the sleeve can rotate relative to the screw sleeve and can also slide relative to the rotation of the axis, and the first spring 81 in the center sleeve is propped between the bottom end face of the fixed rod 30 and the center seat 82, the positioning spring 83 is propped between the center seat 82 and the positioning piston 91, the positioning piston 91 is arranged in the cup body 56 and is propped in the cup body 56 in a sealing way, the first row of air inlets 55 are arranged at intervals along the axial and circumferential dimensions of the center sleeve, a leakage-proof sealing ring is sleeved on the outer rotary face of the cup wall of the cup body, the sealing ring is sleeved on the outer rotary face of the fixed rod, the sealing ring forms the exhaust piston, the center seat 82 is fixedly connected at the opening of the cup body 51 and seals the gap between the opening of the cup body and the center sleeve, the second flange 52 is arranged in the center sleeve 50, the plug is connected and fixedly connected in a non-sliding way in the center sleeve through the second flange 52, the shaft sleeve 21 and the plug 60 of the convex seat 23 are connected with the part of the plug 60 extending out of the center sleeve 50, and one end of the third spring is propped against the gasket and the air leakage plug 92, and the other end of the third spring can be propped against the bottom of the cup body, so that the hinge blade can rotate relative to the shaft sleeve of the boss when being opened, the air exhaust piston in the air pressure chamber can move downwards towards the one-way valve 90 relative to the screw sleeve in a spiral manner, meanwhile, air in the air pressure chamber is discharged outwards through the first row of air inlet holes, the first spring compresses and stores energy, and the hinge continues to rotate axially relative to the shaft sleeve of the boss, so that the air exhaust piston in the air pressure chamber is discharged outwards through the second air outlet holes of the one-way valve after sliding the air exhaust piston in the air pressure chamber past the first row of air inlet holes, and thus the air pressure chamber can be formed. Wherein: the central sleeve and the shaft sleeve are provided with a first row of air inlets which penetrate through the central sleeve and the shaft sleeve along the axial line, the axial direction and the circumferential direction at the size interval positions, so that the exhaust piston can correspond to the one-way valve and the air leakage blocking and positioning spring and the first row of air inlets to form an air pressure chamber; the first row of air inlets are arranged at intervals along the axis and the axial direction and the circumferential direction of the central sleeve and the shaft sleeve, the corresponding hinge is self-positioned at a 90-degree positioning angle starting point of a preset positioning angle, and a boundary point which can be self-closed below the 90-degree positioning angle, namely, when the hinge rotates to the 90-degree positioning angle starting point of the preset positioning angle and the boundary point which can be self-closed below the 90-degree positioning angle, the exhaust piston can correspond to the check valve, the positioning piston and the air leakage plug and the first row of air inlets, so that an air pressure chamber can be formed, and meanwhile, the air pressure chamber can correspond to and cooperate with the hinge to be self-positioned at the preset positioning angle, so that the hinge can be freely self-positioned at the preset positioning angle of 90-180 degrees, and can be self-closed below the 90-degree positioning angle, and the hinge can be freely preset at the preset positioning angle.

Example III

It differs from the embodiment in that: referring to fig. 30 and 35, the sleeve 11 of the hinge 10 is disposed in the fixed seat 20, and the thin rod 42 of the threaded sleeve 40 can rotate relative to the fixed rod 30 and the fixed seat 20; the thin rod 42 constitutes the vane 12, since the thin rod 42 is fixedly connected to the door leaf of the high sealing door by the fixing screw 98. The shaft sleeve 11 forms a central sleeve 50, the central sleeve 50 is provided with a first row of air inlets 55 which penetrate inside and outside, the cup 56 and the shaft sleeve 11 are respectively provided with a row of air inlets 95 which penetrate inside and outside along the axial line, the axial line and the circumferential direction, and the cup 56 and the shaft sleeve 11 can also be provided with no row of air inlets 95; the positioning piston 91 is provided with no second exhaust hole 911 instead of the air leakage block 92, (the positioning piston 91 may be provided with the second exhaust hole 911 and the air leakage block 92; the row of air inlets 95 are arranged in positions which are positioned in the up-down movement track of the positioning piston 91 (one-way valve) along the axial direction and the circumferential direction of the cup wall of the cup body 56, and the row of air inlets 95 are consistent along the axial direction and the circumferential direction interval dimension of the center sleeve 50 and the cup body 56, (of course, the cup body 56 and the shaft sleeve 11 do not need to be provided with the row of air inlets 95); the first row of air inlets 55 are positioned along the axis and the axial and circumferential dimensions of the center sleeve at intervals, and correspond to the hinge to be self-positioned at a 90-degree positioning angle starting point of a preset positioning angle, and at a limiting point below the 90-degree positioning angle capable of self-closing, the hinge is rotated to be self-positioned at the 90-degree positioning angle starting point of the preset positioning angle, and at a limiting point below the 90-degree positioning angle capable of self-closing, so that the air outlet piston 33 can correspond to the positioning piston 91, the positioning spring 83, the row of air inlets 95 and the first row of air inlets 55 to form an air pressure chamber, and meanwhile, the air pressure chamber can correspond to and cooperate with the hinge to be self-positioned in the preset positioning angle, so that the hinge can be freely self-positioned in the preset positioning angle of 90-180 degrees, and can be self-closed below the 90-degree positioning angle, and the hinge can be freely preset in the preset positioning angle. The plug is fixedly connected in the other end of the center sleeve (shaft sleeve) through a fixedly connected screw 98, the screw sleeve is fixedly connected in the other end of the center sleeve (shaft sleeve), and the screw sleeve is spaced from the plug; a fixed rod, a first spring, a center seat, a positioning spring, a positioning piston (one-way valve) and a third spring are arranged between the screw sleeve and the plug in the center sleeve; the screw rod of the fixed rod is in threaded connection with the screw sleeve, the fixed rod is provided with an exhaust piston, and the exhaust piston is in sealed sliding connection in the center sleeve; the first spring is propped between the fixed rod and the center seat, the positioning spring is propped between the center seat and the positioning piston (one-way valve), the positioning piston (one-way valve) is arranged in the center sleeve in a sealing way, and an air pressure chamber is formed between the exhaust piston and the positioning piston (one-way valve); (the positioning piston is a one-way valve); wherein: the exhaust piston moves towards the positioning piston (one-way valve), air in the air pressure chamber is discharged outwards through the first row of air inlet holes, the cup body and the central sleeve of the air pressure chamber are discharged outwards through the first row of air inlet holes, and meanwhile, the air in the air pressure chamber is discharged outwards through the cup body and the central sleeve of the air pressure chamber after the exhaust piston slides through the first row of air inlet holes. The spiral ring 43 is screwed into the lock-connection fixed spiral ring 43 through the center sleeve by the fixed screw 98, so that the spiral ring 43 can not be connected and fixed in the shaft sleeve 11 (center sleeve) (of course, the spiral ring 43 can be omitted in the center sleeve), the spiral ring 43 is positioned under the screw sleeve, the spiral rod is screwed through the spiral ring 43 and then is screwed into the screw sleeve, so that the spiral ring 43 can limit and control the rotation, sliding and moving of the spiral rod relative to the screw sleeve, and the generated interval dimension coefficient can position the axial and circumferential dimension positions of the rotation and sliding of the screw sleeve/fixed rod along the axis, so that the positioning angle can be freely preset relative to the blade of the matched hinge; the sleeve is fixedly connected in one end of the center sleeve, the plug 60 is fixedly connected in the other end of the center sleeve through a fixedly connected screw, and the sleeve is spaced from the plug. And the second bearing may be omitted.

The first row of air inlet holes 55 are arranged at intervals along the axial and circumferential dimensions of the center sleeve 50, the thin rod 42 is fixedly connected to the door leaf of the high-sealing door through the fixedly connected screw 98 so as to position the axial and circumferential dimension interval positions of the screw sleeve/fixed rod rotating and sliding along the axis, the screw rod 31 in the shaft sleeve 11 of the hinge 10 is matched with the screw sleeve 40 in a screwing way so as to be capable of relatively rotating, the screw rod 43 is fixedly connected in the center sleeve 50 in a screwing way through the center sleeve 50 through the fixedly connected screw 98 in a screwing way, the screw rod 43 is positioned under the screw sleeve, the screw rod 31 is screwed through the screw rod 43 and then screwed with the screw sleeve 40, the generated interval dimension coefficient can limit and control the rotational sliding and moving of the screw rod 31 relative to the screw sleeve 40 so as to position the axial and circumferential dimension interval positions of the screw sleeve/fixed rod rotating and sliding along the axis, so that the fixing rod 30 in the center sleeve 50 can rotate and slide downwards towards the positioning piston 91 at fixed axial and circumferential size intervals, at the same time, the air in the air pressure chamber is discharged outwards through the first row of air inlets 55, the cup 56 and the air outlet of the center sleeve, the air outlet piston 33 slides through the first row of air inlets 55, at the same time, the air in the air pressure chamber is discharged outwards through the cup and the air outlet of the center sleeve, so that the air outlet piston 33 in the center sleeve can correspond to the positioning piston, the positioning spring 83 and the first row of air inlets 55 to generate the air pressure chamber, the air outlet piston in the air pressure chamber can generate balance of air pressure and (suction force), and the hinge blade 12 can be ensured to be freely positioned at a preset positioning angle.

Wherein: the hinge can rotate relative to the fixed seat after being opened, so that the fixed rod in the center sleeve can move downwards towards the positioning piston 91 relative to the screw sleeve in a spiral way, meanwhile, the air in the air pressure chamber is discharged outwards through the first row of air inlets, the cup body and the row of air inlets of the center sleeve are discharged outwards, and at the moment, the first spring compresses and stores energy; the hinge fixing rod continuously slides downwards spirally relative to the screw sleeve, the exhaust piston slides through the first row of air inlets, and meanwhile, air in the air pressure chamber is discharged outwards through the cup body and the air outlet holes of the center sleeve, so that the exhaust piston in the center sleeve can correspond to the positioning piston (one-way valve) and the first row of air inlets 55 to form the air pressure chamber, the elastic force of the first spring, the self gravity of the fixing rod and the exhaust piston in the air pressure chamber can correspond to the positioning piston (one-way valve) in the process, the exhaust piston in the air pressure chamber can generate balance between air pressure and suction force, and the hinge can realize self positioning in the process. The hinge is closed to enable the fixed rod to slide upwards relative to the screw sleeve in a spiral way, before the exhaust piston slides out (exits) from the first row of air inlet holes from bottom to top in the air pressure chamber, the exhaust piston in the air pressure chamber can correspond to the positioning piston (one-way valve) and the positioning spring, in the process, the elastic force, self gravity, air pressure and suction force of the first spring born by the exhaust piston in the air pressure chamber are balanced, the positioning piston (one-way valve) can be relatively driven by the air pressure generated by the suction force of the exhaust piston, and is driven from bottom to top and slides upwards along the cup wall in the cup body from bottom to top, when the hinge stops at a preset angle to self-position or slides from bottom to top to enter the position of the air inlet holes, so that outside air enters the air pressure chamber from the shaft sleeve (center sleeve) and the row of the cup body, after the hinge stops at a preset angle and self-positions, the compression energy storage elastic force of the positioning spring is changed at the same time, so that one end of the positioning spring can prop against the center seat, the other end of the positioning spring can prop against the positioning piston, the compression energy storage elastic force of the third spring is changed at the same time, one end of the third spring can prop against the cup bottom of the cup body, the other end of the third spring can prop against the positioning piston, so that the third spring and the positioning spring are mutually matched, the positioning piston (one-way valve) can be mutually propped against to reset, or the third spring and the positioning spring are mutually matched, the positioning piston (one-way valve) can be mutually propped against to reset, so that outside air can be isolated from entering the air pressure chamber from the air exhaust hole of the cup body, and the positioning piston (one-way valve) is balanced by the suction force of the air exhaust piston at the same time, so that the exhaust piston in the center sleeve can be correspondingly positioned with the piston (one-way valve), and the exhaust piston can be self-positioned in the air pressure chamber, and the exhaust piston can be automatically positioned in the air pressure chamber by matching with the hinge at a preset angle as long as the exhaust piston does not slide out (withdraw from) the first row of air inlets. The more the energy storage elasticity and the spring pretightening force intensity of the positioning spring in the air pressure chamber are strong, the stronger the propping elasticity intensity of the positioning piston propped against by the opposite end is, the opposite end of the positioning spring is propped against the center seat, so that the positioning piston in the air pressure chamber is pumped up by the exhaust piston from bottom to top and slides from bottom to top, the stronger the intensity of the atmospheric pressure generated by the suction force of the exhaust piston in the air pressure chamber is, and the stronger the positioning force of the hinge blade in a preset angle is. Before the exhaust piston does not slide from bottom to top through (withdraw) the first row of air inlet holes, the hinge can realize self-positioning, after the exhaust piston slides out of (withdraws from) the first row of air inlet holes, in order to make the outside air of center cover get into the pneumatic chamber from the first row of air inlet holes among the square, relatively make the pneumatic chamber lose barometric pressure and suction force, so that the hinge loses self-positioning function, simultaneously the energy storage of first spring is released, so as to drive the dead lever to move upwards, the hinge can realize self-closing.

Wherein: the central sleeve of the hinge can form an air pressure chamber, and the necessary conditions for freely and predefining the positioning angle are the following circulation movement flow details, when the hinge blade is opened, the thin rod 42 is fixedly connected with the door leaf of the high sealing door through the fixedly connected screw 98, the axial movement of the screw sleeve 40 can be relatively limited, so that the axial and circumferential dimension positions of the screw sleeve/fixed rod along the axis can be positioned, the screw rod in the shaft sleeve of the hinge and the screw sleeve can be matched through the screw connection of the screw rod in the shaft sleeve of the hinge and the screw sleeve so that the screw rod can rotate relative to the screw sleeve, so that the fixed rod in the shaft sleeve can rotate relative to the axis when rotating, and the screw ring 43 can be connected and fixed in the central sleeve 50 in a non-sliding way through the fixedly connected screw ring 11 through the fixedly connected screw rod 98, and the first spring 81 in the central sleeve is propped between the bottom end surface of the fixed rod 30 and the central seat 82, and is held against between the center seat 82 and the check valve 90 by the positioning spring 83, and is sealed in the cup 56 and is held against the inside of the cup 56 by the check valve 90, and is positioned by the first row of air inlet holes 55 along the axial and circumferential dimension intervals of the center sleeve, and is sleeved with a leak-proof sealing ring by the outer rotary surface of the cup wall of the cup, and is sealed in and held against the inside of the cup 56 by the positioning piston, and is held against the outside of the cup by the fixing rod, the sealing ring forms the exhaust piston, and is fixedly connected at the opening of the cup 51 by the center seat 82 and seals the gap between the opening of the cup and the center sleeve, and is screwed into the lock plug 60 through the center sleeve 50 by the fixing screw 98, so that the plug 60 is fixedly connected in the center sleeve 50, and the other end is held against the positioning piston by the third spring, the hinge can rotate relative to the shaft sleeve of the fixed seat when being opened, so that the exhaust piston in the fixed rod can move downwards towards the positioning piston 91 relative to the swivel nut, gas in the air pressure chamber is discharged outwards through the first row of air inlets, the cup body and the air inlets of the central sleeve are compressed and stored, the first spring compresses and stores energy, the hinge continues to axially rotate and slide relative to the shaft sleeve of the fixed seat, and after the exhaust piston slides over the first row of air inlets, gas in the air pressure chamber is discharged outwards through the air inlets of the cup body and the central sleeve, so that the air pressure chamber can be formed. Wherein: the central sleeve and the shaft sleeve are provided with a first row of air inlets which penetrate through the inner part and the outer part along the axial line, the axial direction and the circumferential direction at the size interval positions, so that the air exhaust piston can correspondingly position the piston and the positioning spring, and the air exhaust hole 95 and the first row of air inlets 55 so as to form an air pressure chamber; the first row of air inlets 55 are arranged at intervals along the axial direction and the circumferential direction of the center sleeve, the corresponding hinge is self-positioned at a 90-degree positioning angle starting point of a preset positioning angle, and a boundary point capable of self-closing under the 90-degree positioning angle, namely, the hinge rotates to the 90-degree positioning angle starting point of the preset positioning angle to self-position, and when the hinge is self-closing under the 90-degree positioning angle, the air outlet piston can correspond to the positioning piston, the positioning spring and the first row of air inlets 55 to form an air pressure chamber, and meanwhile, the air pressure chamber can correspond to and cooperate with the hinge to self-position at the preset positioning angle, so that the hinge can freely self-position in the preset positioning angle of 90-180 degrees, and can self-close under the 90-degree positioning angle, and the hinge can freely preset positioning angle.

The foregoing description is only illustrative of the preferred embodiments of the present invention, and therefore should not be taken as limiting the scope of the invention, for all changes and modifications that come within the meaning and range of equivalency of the claims and specification are therefore intended to be embraced therein.

Claims

1. The high sealing door pneumatic self-positioning and self-closing hinge comprises a hinge, a fixed seat, a fixed rod and a screw sleeve, wherein the hinge is provided with a shaft sleeve and a blade fixedly connected outside the shaft sleeve, the fixed seat is provided with another shaft sleeve, the hinge can rotate relative to the fixed seat and the convex seat, and the fixed rod is provided with a screw; the method is characterized in that: the device also comprises a plug and a central sleeve, wherein the central sleeve and the shaft sleeve are respectively provided with a first row of air inlets penetrating inside and outside along the axial line, the axial direction and the circumferential space dimension position; the center sleeve is sleeved in the shaft sleeve of the hinge and the shaft sleeve of the fixed seat; the screw sleeve can be rotatably arranged in the center sleeve and fixedly connected with a shaft sleeve, the plug is arranged in the center sleeve and fixedly connected with another shaft sleeve, the screw sleeve is spaced from the plug, and a fixed rod, a first spring, a center seat, a positioning spring and a one-way valve are arranged between the screw sleeve and the plug in the center sleeve; the screw rod of the fixed rod is in threaded connection with the screw sleeve, the fixed rod is provided with an exhaust piston, and the exhaust piston is in sealed sliding connection in the center sleeve; the first spring is propped between the fixed rod and the center seat, the positioning spring is propped between the center seat and the one-way valve, the one-way valve is arranged in the center sleeve in a sealing way, and a pneumatic chamber is formed between the exhaust piston and the one-way valve; wherein: the exhaust piston moves towards the one-way valve, air in the air pressure chamber is discharged outwards through the first row of air inlet holes and the one-way valve, and after the exhaust piston slides through the first row of air inlet holes, the air in the air pressure chamber can be discharged outwards through the one-way valve.

2. The high sealing door pneumatic self-positioning and self-closing hinge comprises a hinge, a fixed seat, a fixed rod and a screw sleeve, wherein the hinge is provided with a shaft sleeve which is arranged in the fixed seat, a thin rod arranged on the screw sleeve can rotate relative to the fixed rod, and the fixed rod is provided with a screw rod; the method is characterized in that: the plug is also included, the shaft sleeve forms a central sleeve, and the central sleeve is provided with a first row of air inlets which penetrate inside and outside; the cup body is adjustably arranged in the center sleeve along the center sleeve; the cup body and the shaft sleeve are respectively provided with an inner and an outer penetrating air inlet row along the axial line, the axial direction and the circumferential dimension interval position; the screw sleeve is fixedly connected in one end of the center sleeve, the plug is fixedly connected in the other end of the center sleeve, and the screw sleeve is spaced from the plug; a fixed rod, a first spring, a center seat, a positioning spring and a positioning piston are arranged between the screw sleeve and the plug in the center sleeve; the screw rod of the fixed rod is in threaded connection with the screw sleeve, the fixed rod is provided with an exhaust piston, and the exhaust piston is in sealed sliding connection in the center sleeve; the first spring is propped between the fixed rod and the center seat, the positioning spring is propped between the center seat and the positioning piston, the positioning piston is arranged in the center sleeve in a sealing way, and a pneumatic chamber is formed between the exhaust piston and the positioning piston; wherein: the exhaust piston moves towards the positioning piston, air in the air pressure chamber is discharged outwards through the first row of air inlets, the cup body and the central sleeve, and after the exhaust piston slides through the first row of air inlets, the air in the air pressure chamber is discharged outwards through the cup body and the central sleeve.

3. The high-tightness door pneumatic self-positioning and self-closing hinge according to claim 1 or 2, characterized in that: the check valve comprises a positioning piston which can slide and seal the air pressure chamber, an air leakage plug and a third spring, wherein the center of the positioning piston is provided with a second air exhaust hole, the air leakage plug comprises a gasket and a plug column which is convexly arranged at the center of the gasket, the plug column is adapted to extend into the second air exhaust hole, one end of the third spring is propped against the gasket, and the other end of the third spring is propped against the plug relatively.

4. The high seal door pneumatic self-positioning and self-closing hinge as claimed in claim 3, wherein: the center seat is an exhaust bolt.

5. The high seal door pneumatic self-positioning and self-closing hinge as claimed in claim 4, wherein: the one-way valve is arranged in the cup body, and the center seat is fixedly connected with the cup body.

6. The high seal door pneumatic self-positioning and self-closing hinge as claimed in claim 5, wherein: the cup body is adjustably arranged in the center sleeve along the center sleeve, and the adjusting seat penetrates through the plug to be connected with the cup body so as to adjust the axial position of the cup body relative to the center sleeve.

7. The high seal door pneumatic self-positioning and self-closing hinge as recited in claim 6, wherein: the cup body is provided with a step for limiting the movement of the positioning piston in a direction approaching to a third spring, and the third spring is propped against the bottom of the cup body and the gasket.

8. A highly sealed door pneumatic self-positioning and self-closing hinge as claimed in any one of claims 1 to 3, wherein: and a sealing ring is sleeved outside the fixed rod, and the sealing ring forms the exhaust piston.

9. A highly sealed door pneumatic self-positioning and self-closing hinge as claimed in any one of claims 1 to 3, wherein: the device also comprises a spiral ring which can be fixedly arranged in the central sleeve, the spiral ring is positioned between the spiral sleeve and the exhaust piston, and the screw rod of the fixed rod is in threaded connection with the spiral ring and then in threaded connection with the spiral sleeve.