CN106499284B - Pneumatic self-positioning and self-closing hinge - Google Patents

Abstract

The invention discloses an air pressure type self-positioning and self-closing hinge which comprises two hinges, a fixed rod, a threaded sleeve, a plug and a center sleeve. The hinge is provided with a shaft sleeve and a blade. The center is sleeved with a first row of air intake holes; the center sleeve is sleeved in the two shaft sleeves of the hinge; 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hinge can be self-positioned in a preset positioning angle, and can be self-closed below the positioning angle which is withdrawn from the preset positioning angle.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

Pneumatic self-positioning and self-closing hinge

Technical Field

The invention relates to a 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 utility model provides a 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 pneumatic self-positioning and self-closing hinge comprises two hinges, a fixed rod and a threaded sleeve, wherein each hinge is provided with a shaft sleeve and a blade fixedly connected outside the shaft sleeve, the two hinges can rotate relatively, 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 sleeves of the two hinges; 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 check valve is hermetically arranged in the center sleeve, and an air pressure chamber is formed between the exhaust piston and the check 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 air pressure type self-positioning and self-closing hinge comprises a first hinge, a second hinge, a fixed rod and a threaded sleeve, wherein the first hinge is provided with a first blade and two first shaft sleeves fixedly connected with the first blade at intervals, the second hinge comprises a second blade and a second shaft sleeve fixedly connected with the second blade, the second shaft sleeve is adaptively matched between the two first shaft sleeves, the first hinge and the second hinge can rotate relatively, and the fixed rod is provided with a screw; the cup body and the shaft sleeve are respectively provided with an inner-outer penetrating row of air inlets along the axial line, the axial direction and the circumferential dimension interval position; the plug is fixedly connected in the other end of the center sleeve, and the screw sleeve is spaced from the plug; a fixing rod is arranged between the screw sleeve and the plug in the center sleeve a first spring a center seat, a positioning spring and a positioning piston (one-way valve); 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.

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 plug.

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.

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

the hinge can rotate relative to the axis of the shaft sleeve 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 and is discharged outwards through the one-way valve, and at the moment, the first spring compresses and stores energy; the exhaust piston in the air pressure chamber can be correspondingly positioned with the piston 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 spirally relative to the screw sleeve, the exhaust piston is arranged in the air pressure chamber from bottom to top before sliding out (withdrawing) of the first exhaust hole, so that the exhaust piston in the air pressure chamber can correspond to the positioning piston and the positioning spring, in the process, the elastic force, self gravity, air pressure and (suction force) of the first spring borne by the exhaust piston in the air pressure chamber are balanced, the positioning piston can be relatively enabled to be driven by the air pressure generated by the air pressure of the exhaust piston, and is driven upwards from bottom to top and slides upwards from bottom to top until the hinge stops at a preset positioning angle, at the same time, the compression energy storage elastic force of the positioning spring is changed, 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 to the step propped by the positioning piston, and at the same time, the air storage elastic force of the third spring is changed when the positioning piston is driven upwards from bottom to top and slides upwards from bottom, so that one end of the third spring can prop against the bottom of the peripheral wall of the exhaust piston, the other end of the third spring can prop against the air pressure piston to top when the air pressure piston is not matched with the first exhaust hole, and the air pressure is not matched with the first exhaust hole, so that the air is arranged in the air pressure chamber, and the air is not to slide out of the first exhaust hole, and is matched with the air inlet hole from top to the air hole, and the air pressure is prevented from sliding out of the air pressure chamber, 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, so that the hinge can realize self-closing. 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 positioning angle starting point of a preset positioning angle, and at a boundary point which can be self-closed below the preset angle, the hinge is rotated to a preset positioning angle starting point for self-positioning, and when the positioning angle starting point is below the preset angle and the air exhaust piston can be self-closed, so that the air exhaust piston can correspond to the one-way valve, the positioning spring, the air leakage plug and the first row of air inlet holes, the air pressure chamber can be formed, so that the hinge can be self-positioned at a preset positioning angle and can be self-closed below the preset positioning angle, and meanwhile, the air pressure chamber can be corresponding to and matched 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 and can be self-closed below the preset angle, and the positioning angle can be freely set relative to the hinge.

The adjusting seat can adjust the axial position of the cup body relative to the central sleeve so as to correspondingly adjust the compression energy storage elasticity and the pretightening force of the first spring and the size of the air pressure chamber cavity, at least the self-closing force can be adjusted, and the self-closing speed is high and low.

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

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

Fig. 4 is a schematic diagram showing an assembly structure of a center housing according to the first embodiment.

Fig. 5 is a schematic perspective view of a center sleeve according to the first embodiment.

FIG. 6 shows a first embodiment the structure of the center sleeve is schematically shown.

Fig. 7 is a schematic perspective view of a first bearing according to the first embodiment.

Fig. 8 is a perspective view showing a screw sleeve according to the first embodiment.

Fig. 9 is a schematic view showing the structure of a screw sleeve according to the first embodiment.

Fig. 10 is a perspective view of a spiro ring according to the first embodiment.

Fig. 11 is a schematic structural view of a spiral ring according to the first embodiment.

FIG. 12 is a schematic view showing a structure of a fastening screw according to the first embodiment

Fig. 13 is a schematic perspective view of a fixing rod according to the first embodiment.

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

FIG. 15 shows a first embodiment a perspective view of the vent plug.

Fig. 16 is a schematic diagram showing a structure of an exhaust plug according to the first embodiment.

Fig. 17 is a schematic structural diagram of a positioning piston according to the first embodiment.

Fig. 18 is a schematic perspective view of a positioning piston according to the first embodiment.

Fig. 19 is a schematic perspective view of a leak blocking in the first embodiment.

Fig. 20 is a schematic view showing the structure of a cup according to the first embodiment.

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

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

Fig. 23 is a schematic structural diagram of a plug according to the first embodiment.

Fig. 24 is a schematic structural diagram of an adjusting seat according to the first embodiment.

Fig. 25 is a schematic perspective view of an adjusting seat according to the first embodiment.

Fig. 26 is a schematic structural view of a hinge according to the second embodiment.

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

Fig. 28 is a schematic structural view of a first hinge according to a second embodiment.

FIG. 29 is a schematic view showing a structure of an exhaust plug according to the second embodiment

Fig. 30 is a schematic view showing a positioning piston structure according to the second embodiment

FIG. 31 shows a second embodiment is a schematic view of the structure of the cup body

Fig. 32 is a schematic structural view showing a hinge according to the third embodiment

FIG. 33 is a schematic view showing a structure of a second blade according to the third embodiment

FIG. 34 shows a third embodiment schematic structural view of first blade

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

Fig. 36 is a schematic view showing the structure of a first spring according to the third embodiment.

Fig. 37 is a schematic structural view of a third spring according to the third embodiment.

Fig. 38 shows a schematic structural diagram of a spiro ring according to the third embodiment.

Detailed Description

Example 1

The pneumatic self-positioning and self-closing hinge can self-position at any one of the preset angle of 80 degrees to the preset angle of 180 degrees when the hinge is opened at the angle of 0 degrees to 80 degrees, the hinge leaf shaft sleeve can be arranged in any shape, such as butterfly hinges, H-shaped hinges, primary-secondary hinges, flag hinges, door hinges, automobile hinge hinges, any special hinge leaf shaft sleeve and the like, and is suitable for being arranged in any door leaf, any door window, any door carriage door and the like.

The hinge, please refer to fig. 1 to 25, includes a first hinge 10, a second hinge 20, a fixing rod 30, a threaded sleeve 40, a central sleeve 50, a plug 60 and an adjusting seat 70. The first hinge 10 is provided with a first blade 12 and a first shaft sleeve 11 fixedly connected with the first blade 12, and the second hinge 20 comprises a second blade 22 and a second shaft sleeve 21 fixedly connected with the second blade 22. The center housing 50 is connected within the first and second housings 11, 21, and the first and second housings 11, 21 are disposed side-by-side along the center housing such that the two hinges are rotatable relative to one another. The central hub 50 and the first hub 11 are each provided with a first row of air intake holes 55 extending therethrough along the axis and along the axial and circumferential dimensions. The first sleeve 11 is provided with a first row of air intake holes 55 penetrating inside and outside, and is the first row of air intake holes 55 of the auxiliary center sleeve 50 (of course, the first sleeve may not be provided with the first row of air intake holes 55).

The screw sleeve 40 is rotatably and non-slidably connected in the central sleeve 50, and the first sleeve 11 of the first hinge 10 is fixedly connected to a portion of the screw sleeve 40 extending out of the central sleeve 50, for example: a rotating ring 41 is further arranged, a thin rod 42 is convexly arranged at the upper part of the threaded sleeve 40, the thin rod 42 can rotatably penetrate through the rotating ring 41, the rotating ring 41 is adapted to be matched with the upper part of the first shaft sleeve 11, the thin rod 42 is fixedly connected with the rotating ring 41 by being locked into the rotating ring 41 through the first shaft sleeve 11 by arranging a fixedly connecting screw 98, so that the first shaft sleeve 11, the rotating ring 41 and the thin rod 42 are fixedly connected together, the rotating ring 41 and the first shaft sleeve 11 can also limit the axial movement of the threaded sleeve 40, and the axial and circumferential dimension spacing positions of the rotating and sliding of the threaded sleeve/fixed rod along the axis can be relatively ensured to be matched with the blade 12 of the hinge 10 to be self-positioned at a preset positioning angle. The plug 60 is connected in the center housing 50, and the second housing 21 of the second hinge 20 is fixedly connected to a portion of the plug 60 extending out of the center housing 50, for example, by a fixing screw 98, which is locked through the second housing 21 and is fixedly connected 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 adjustably disposed within the center housing 50 along the axis of the center housing 50, the cup 56 having a bottom opening. 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 screw sleeve, the screw rod 31 is screwed through the spiral ring 43 and then is screwed with the screw sleeve 40, so that the spiral ring 43 can limit and control the screw rod 31 to rotationally slide and move relative to the screw sleeve 40, and the generated space dimension coefficient is the axial and circumferential dimension space position capable of positioning the screw sleeve/fixing rod to rotate and slide along the axis, so that the blade 12 of the matched hinge 10 can be relatively ensured to be self-positioned in a preset positioning angle. The check valve 90 is a positioning piston 91. 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.

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 56 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 inlet holes 55 are arranged in the movable track of the air exhaust piston 33 along the center sleeve; the first row of air intake holes 55 are positioned along the axial and circumferential dimensions of the center housing 50 and the shaft housing at a distance corresponding to the hinge being self-positionable at a 90 degree positioning angle starting point of a predetermined set positioning angle and at a boundary point below the 90 degree positioning angle capable of self-closing, i.e., the hinge is rotated to a 90 degree positioning angle starting point of a predetermined set positioning angle and self-positionable, and at a boundary point below the 90 degree positioning angle capable of self-closing, the air exhaust piston 33 corresponds to the check valve 90 and the positioning spring and the air leakage plug 92 and the first row of air intake holes 55 to form an air pressure chamber, and at the same time the air pressure chamber can correspond to and cooperate with the hinge to self-position in the predetermined set positioning angle so that the hinge can be free self-positioned in the predetermined set positioning angle of 90 degrees to 180 degrees, so that the hinge can be free of the predetermined set positioning angle.

Through the first row of air intake holes 55, are arranged along the axial and circumferential dimension spacing positions of the central sleeve 50 and the shaft sleeve 11, and through the fixed screw 98 are screwed into the shaft sleeve 11 to pass through the swivel 41 in a screwed connection mode to lock and fix the thin rod 42, the shaft sleeve, the swivel and the thin rod are fixedly connected together, so that the swivel 41 can be matched with the rotation of the hinge 10 and the shaft sleeve 11, the swivel 41 and the hinge 10 can limit the axial movement of the screw sleeve 40, the axial and circumferential dimension spacing positions which can relatively position the screw sleeve/the fixed rod to rotate and slide along the axis are matched with the screw 31 in the hinge 10 and the shaft sleeve 11 and the screw sleeve 40 in a screwed connection mode to relatively rotate and slide in the central sleeve 50 through the first flange 51, the screw 43 is positioned below the screw sleeve and the screw 31 is screwed through the screw 43 to be screwed with 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 nut 40, the generated space size coefficient can position the axial and circumferential size space positions of the rotation and sliding of the nut/fixed rod along the axis, so that the fixed rod 30 in the center sleeve 50 can rotate and slide relative to the nut 40, the fixed axial and circumferential size space spiral downwards moves towards the check valve 90 by the exhaust piston 33 arranged on the fixed rod 30, at the same time, the gas in the air pressure chamber is discharged outwards through the first exhaust hole 55 and the second exhaust hole 911 of the check valve 90, at the same time, the exhaust piston 33 slides downwards through the first exhaust hole 55 again, at the same time, the gas in the air pressure chamber is discharged outwards through 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 plug 92, the positioning spring 83 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 blades can be freely preset to set the positioning angle positions.

The first spring 81 in the center sleeve is propped between the bottom end surface of 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 in the cup 56, and the exhaust piston 33, the one-way valve 90 and the positioning spring 83 form an air pressure chamber. The check valve 90 is a positioning piston 91. Wherein: the fixing rod 30 has the exhaust piston 33 moving downward toward the check valve 90, while the air in the air pressure chamber is exhausted outward through the first row of air intake holes 55, the air is discharged outwards through the air exhaust bolt and the second air exhaust hole 911 of the one-way valve, and the first spring compresses and stores energy at the moment; the first hinge 10 is further opened to rotate relative to the axis of the second hinge 20, so that the vent piston 33 of the fixed rod 30 in the first shaft sleeve 11 can continuously slide downwards in a spiral manner relative to the screw sleeve, at the same time, after the vent piston 33 slides over the first row of air inlet holes, air in the air pressure chamber is discharged outwards through the vent bolt 82 and the second air outlet hole 911 of the check valve 90, so that the vent 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 inlet holes 55, an air pressure chamber can be formed, the elastic force and self gravity of the first spring 81 borne by the fixed rod in the process, and the vent piston 33 in the air pressure chamber can correspond to the positioning piston 91 and the positioning spring 83, so that the vent piston 33 in the air pressure chamber can generate air pressure and (suction force) balance, and the blade 12 of the hinge 10 can realize self-positioning, so that the vent piston 33 can cooperate with the positioning piston 91 and the positioning spring 83 to generate (suction force) and atmospheric pressure in the air pressure chamber, and the blade 12 can be correspondingly positioned in the air pressure chamber, and the air pressure chamber, the flexible hinge 10 can be set at a preset angle. The blade 12 of the hinge 10 is closed by an external force so that the vent piston 33 provided in the fixing rod 30 in the first boss 11 can be moved spirally upward relative to the boss so that the vent piston 33 is before sliding from bottom to top through the first vent hole 55, and at the same time, the air pressure and the suction force are generated as long as the vent piston 33 is from bottom to top, the positioning piston 91 is relatively moved from bottom to top by the air pressure of the vent piston 33, the blade 12 stops at a predetermined angle and self-positioning is performed by being moved from bottom to top by the positioning piston 33, and at the same time, the compression energy storage elastic force of the positioning spring 83 is changed so that one end of the positioning spring 83 can be supported against the center seat, the other end can be supported against the step 561 supported by the positioning piston 91, and at the same time, the compression energy storage elastic force of the third spring 93 is changed so that one end of the third spring can be supported against the cup bottom of the cup, and the other end is relatively moved against the spacer 921 and the stopper 922 of the stopper 92 to the peripheral wall of the positioning piston 91, so that the air pressure is prevented from entering the air pressure chamber 10 from the second vent hole 12, and the air pressure is relatively positioned from the outside the chamber, and the air pressure is relatively positioned from the air pressure chamber 10. The more the energy storage elastic force and the spring pretightening force intensity of the positioning spring 83 are stronger, so that the elastic force intensity of the positioning piston 91 propped against one end of the positioning spring 83 is relatively stronger, the other end of the positioning spring props against the center seat, so that the air pressure and the intensity of the suction force born by the air pressure chamber are relatively stronger before the air release piston 33 slides out (exits) from the bottom to the top of the first row of air inlets 55, the positioning force of the self-positioning of the blade of the hinge in the preset positioning angle is relatively stronger, and the air release piston 91 slides out (exits) from the bottom to the top of the first row of air inlets 55, so that the air outside the center sleeve 50 enters the air pressure chamber from the first row of air inlets, and the air pressure and the suction force are relatively lost in the air pressure chamber, so that the blade 12 of the hinge 10 loses the self-positioning function, and at the same time, the energy storage of the first spring 81 is released, so that the fixing rod 30 is driven to move upwards, and the hinge can realize self-closing.

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 921, 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 abuts for restricting the movement of the positioning piston 91 in a direction approaching the third spring 93. The end face of the second exhaust hole 911 is concavely arranged in a taper hole from large to small relative to the gasket direction, 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 91, 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 leak-proof sealing ring 912 is in sliding sealing contact with the cup wall of the cup body, thereby isolating and preventing outside air from entering the air pressure chamber of the center sleeve from the cup wall of the cup body 56. When the exhaust piston spirally slides downwards, gas in the air pressure chamber extrudes the peripheral wall of the second exhaust hole, so that a gap is generated between the peripheral wall of the second exhaust hole and the blocking column 922, the gas is discharged through the gap between the peripheral wall of the second exhaust hole and the blocking column 922, the gasket 921 and the blocking column 922 are retreated by extruding the gasket and the blocking column through the discharged gas, so that a gap is generated between the gasket and the bottom wall of the positioning piston, the gas is discharged through the gap between the gasket and the bottom wall of the positioning piston, and after being discharged, one end of the third spring can prop against the bottom of the cup body under the action of the energy storage elasticity and self elasticity of the third spring, and the other end of the third spring can prop against the gasket 921 and the blocking column 922 to be reset to the peripheral wall of the surface of the positioning piston, so that external air is isolated and prevented from penetrating into the air pressure chamber from the second exhaust hole 911.

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 322 is sleeved in the annular mounting groove 321, the leak-proof sealing ring 322 also extends out of the annular 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 leak-proof sealing ring forms the exhaust piston. 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 that 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 adjusted, and the self-closing strength and the self-closing speed are adjusted. The adjusting seat 70 is, for example, a screw rod, which is screwed through the plug and is connected with the bottom of the cup body, for example, the screw rod is provided with a step surface, the step surface is propped against the bottom surface of the bottom of the cup body, the screw rod can rotate through the opening of the bottom of the cup body, and a nut is further arranged to be screwed on the tail end of the screw rod and is propped against the top surface of the bottom of the cup body.

Optionally, a spiral ring 43 fixedly arranged in the center sleeve can be further included, the spiral ring 43 is positioned between the screw sleeve and the exhaust piston, the spiral ring is connected under the screw sleeve in a abutting mode, and the screw rod of the fixing rod passes through the spiral ring in a threaded mode and is then connected with the screw sleeve in a threaded mode.

In this embodiment: a first flange 51 is arranged on the center sleeve 50, and the spiral ring 43 is connected and fixedly connected in a non-rotatable and slidable manner in the center sleeve 50 through the first flange 51; a first part is arranged between the screw sleeve 40 and the center sleeve 50 the bearing 44 (by centrally nesting a third flange 53, to enable axial limited connection and securement of the first bearing 44); 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 by which the plug 60 is connected and secured in the center housing in a rotationally fixed and slidable manner. 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 leak-proof seal 824 also 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. The center seat 82 and the cup 56 pass through the set screws 98 are connected together. 322. 824, 912, 562 are all resilient. The peripheral surface of the outer rotary surface of the cup wall of the cup body is concavely provided with an annular mounting groove 560, the mounting groove 560 is sleeved with a leakage-proof sealing ring 562, and the leakage-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 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.

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).

The first blade 12 of the first hinge 10 can rotate relative to the axis of the second hinge 20 after being opened by external force, so that the exhaust piston 33 of the fixed rod 30 in the first shaft sleeve 11 can move downwards towards the one-way valve 90 relative to the spiral sleeve in a spiral manner, and at the same time, the gas in the air pressure chamber is discharged outwards through the first row of air inlets and is discharged outwards through the one-way valve, and at the moment, the first spring compresses and stores energy; the first hinge 10 can rotate relative to the axis of the second hinge 20 after being opened, so that the exhaust piston 33 of the fixed rod 30 in the first shaft sleeve 11 can continuously slide downwards in a spiral manner relative to the screw sleeve and slide through the first row of air inlets 55, meanwhile, the air in the air pressure chamber is discharged outwards through the one-way valve, so that the exhaust piston 33 in the center sleeve can correspond to the one-way valve 90, the air leakage plug 92, the positioning spring 83 and the first row of air inlets 55, the air pressure chamber can be formed, the elastic force of the first spring, the self gravity of the fixed rod and the air pressure (suction force) of the air pressure chamber are balanced in the process, so that the exhaust piston in the air pressure chamber can correspond to the positioning piston, the positioning spring and the first row of air inlets 55, the air pressure and the suction force generated by the exhaust piston in the air pressure chamber are balanced, and the hinge can realize self positioning in the process. Before the hinge is closed by an external force to enable the hinge to rotate relative to the hinge axis in a closing manner, so that the vent piston 33 in the first shaft sleeve 11 can move upwards relative to the spiral sleeve spiral, the vent piston in the air pressure chamber is not slid out (withdrawn) from the bottom to the top in the first row of air inlet holes, so that the vent piston in the air pressure chamber can correspond to the positioning piston and the positioning spring, in the process, the elasticity, self gravity, the air pressure and the (suction force) of the first spring exerted by the vent piston in the air pressure chamber are balanced, the vent piston is relatively enabled to be driven by the suction force of the vent piston, and is driven from bottom to top and slid from bottom to top until the hinge blade stops at a preset angle, the compressed energy storage elasticity of the positioning spring changes, so that one end of the positioning spring can prop against the center seat, the other end of the positioning piston (one-way valve) can prop against the step against which the positioning piston (one-way valve) props against, and at the same time, when the air piston is driven from bottom to top and is driven from top to bottom and slides up against the bottom in the second row of air inlet holes (one end of the positioning piston) can block the air inlet hole, the third piston can be blocked up from bottom to the air inlet hole (one end of the air inlet hole is blocked by the piston 922) can be prevented from sliding from top to bottom to outside the other end of the air inlet hole, the hinge blade can be automatically positioned at a preset positioning angle in the air pressure chamber in a mobility matching manner, so that the hinge can be automatically positioned in the process. The more the strength of the energy storage elasticity and the pretightening force of the positioning spring in the air pressure chamber is strong, the stronger the propping elastic strength 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 strength of the atmospheric pressure generated by the suction force of the exhaust piston in the air pressure chamber is, and the stronger the positioning strength of the hinge blade in the preset angle is. The hinge can rotate relative to the axis of the hinge through external force closure, the exhaust piston can realize self-positioning before going up from bottom to top through the exhaust air inlet hole, after the exhaust piston slides across the first row of air inlet holes, outside air enters the air pressure chamber from the first row of air inlet holes in the middle of the dimension, and the air pressure and the suction force are lost in the air pressure chamber relatively, so that the first blade of the first hinge loses the self-positioning function, and meanwhile, the energy storage of the first spring is released, so that the fixing rod can be driven to move upwards, and the hinge can realize self-closing.

When the hinge blade needs to be positioned at a preset positioning angle, the fixing screw 98 is screwed into the shaft sleeve 11 to pass through the swivel 41 and then lock the fixing thin rod 42 after being screwed into the swivel so as to fix the shaft sleeve, the swivel and the thin rod together, the swivel 41 and the hinge 10 can also limit the axial movement of the screw sleeve 40, so that the axial and circumferential size spacing positions of the screw sleeve/the fixing rod along the axis can rotate and slide, the screw rod in the shaft sleeve of the hinge is matched with the screw sleeve to rotate relatively, the axial and circumferential spacing size positions of the screw sleeve in the shaft sleeve of the hinge can be arranged through the first row of air inlets, and the air discharging piston in the central sleeve can correspond to the positioning piston and the positioning spring to form an air pressure chamber, so that the air discharging piston in the air pressure chamber generates air pressure and (suction force) balance, the air pressure generated by the suction force of the air discharging piston can be relatively pumped up from bottom to top, and the positioning angle of the hinge can be relatively ensured. The more powerful the energy storage elasticity and the spring pre-tightening force intensity of the positioning spring are, the stronger the propping elastic intensity of the positioning piston 91 propped against the opposite end must be, the other end of the positioning spring is propped against the center seat, so that before the exhaust piston does not slide out (exit) of the first row of air inlets from bottom to top, the intensity of the air pressure and the intensity of the suction force born in the air pressure chamber are relatively stronger, the compression energy storage elasticity and the spring pre-tightening force intensity of the positioning spring must be ensured to be larger than the compression energy storage elasticity and the spring pre-tightening force intensity of the first spring plus the compression energy storage elasticity and the spring pre-tightening force intensity of the third spring, and the hinge blade can be self-positioned in a preset 80-degree positioning angle to 180-degree positioning angle.

Wherein the method comprises the steps of the method comprises the following steps: 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 sleeve 11 through the sleeve 41 and then locks the fixing thin rod 42, so that the sleeve, the rotating ring and the thin rod are fixedly connected together, the rotating ring 41 can be matched with the rotation of the hinge 10 and the sleeve 11, the rotating ring 41 and the hinge 10 can also limit the axial movement of the sleeve 40, so that the axial and circumferential dimension spacing positions of the screw sleeve/fixing rod which can rotate and slide along the axis can be positioned, the first flange 51 is arranged through the central sleeve 50, the spiral ring 43 is connected and fixed in the central sleeve 50 in a non-sliding manner through the first flange 51, and the screw rod in the sleeve of the hinge and the screw sleeve are matched with the screw sleeve in a screwed mode so as to rotate relatively, so that the fixed rod in the shaft sleeve can rotate relative to the screw sleeve and can also move relative to the axis when rotating, the fixed rod is propped between the bottom end face of the fixed rod 30 and the center seat 82 through the first spring 81 in the center sleeve, the fixed 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 in the cup 56, the first row of air inlets 55 are arranged at intervals along the axis and the axial and circumferential dimensions of the center sleeve, the outer rotating face of the cup wall is sleeved with a leakage-proof sealing ring, the fixed rod is sleeved with a sealing ring, the sealing ring forms the exhaust piston, the gap between the opening of the cup and the center sleeve is fixedly connected at the opening of the cup 56 through the center seat 82, the second flange 52 is arranged on the center sleeve 50, the plug 60 is connected and fixedly connected in the center sleeve 50 in a relatively non-sliding manner through the second flange 52, the second sleeve 21 of the second hinge 20 is connected with the part of the plug 60 extending out of the center sleeve 50, one end of the third spring is propped against the gasket and the air leakage plug 92, the other end of the third spring is propped against the bottom of the cup body, so that when the hinge blade is opened, the hinge blade can rotate relative to the sleeve axis of the hinge, the air discharging piston in the air pressure chamber can move towards the one-way valve 90 in a spiral downward sliding manner relative to the screw sleeve, air in the air pressure chamber is discharged outwards through the first row of air inlets and outwards through the one-way valve, meanwhile, the first spring compresses and stores energy, the hinge continues to rotate relative to the hinge axis, so that after the air discharging piston in the air pressure chamber can slide downwards relative to the screw sleeve, the air discharging piston in the air pressure chamber outwards through the second air outlet 911 of the one-way valve, and the air pressure chamber can be formed relatively in the center sleeve of the hinge. Wherein the method comprises the steps of the method comprises the following steps: the center housing 50 is provided with a first row of air intake holes extending therethrough along the axis and axially and circumferentially, the exhaust piston can correspond to the one-way valve, the leakage blocking and positioning spring and the first row of air inlets so as to form an air pressure chamber; the first row of air inlets are arranged at intervals along the axial line, 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 with a preset positioning angle and a boundary point which can be self-closed under the 90-degree positioning angle, namely, the hinge rotates to the 90-degree positioning angle starting point with the preset positioning angle to self-position, and when the hinge is self-closed under the 90-degree positioning angle, the exhaust piston corresponds to the one-way valve, the positioning spring, 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 be capable of self-positioning in a 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 to set the positioning angle.

Example two

It differs from the embodiment in that: referring to fig. 26 to 31, the hinge is a butterfly hinge assembly, the first hinge 10 is provided with a first blade 12 and two first bushings 11 fixedly connected to the first blade at intervals, and the second hinge 20 comprises a second blade 22 and a second bushing 21 fixedly connected to the second blade. The wheelbase of the second sleeve 21 is adapted to the distance between the two first sleeves 11, and the second sleeve 21 is adapted to fit between the two first sleeves 11. The screw sleeve 40 is fixedly connected in a first shaft sleeve 11 through a fixedly connected screw 98 and is rotatably connected in one end of a second shaft sleeve 21; the plug 60 is fixedly connected in one end of the second shaft sleeve 21 by a fixing screw 98, and the part extending out of the central sleeve 50 is connected in the other first shaft sleeve 11, so that the first hinge and the second hinge can rotate relatively. The second sleeve 21 forms a central sleeve 50, the central sleeve 50 is provided with a first row of air inlet holes 55 penetrating inside and outside, the cup 56 and the second sleeve 21 are positioned at the same circumferential direction along the axis and the axial direction, each of which is provided with a row of air inlets 95 penetrating inside and outside, (the cup 56 and the second sleeve 21 can be provided with no row of air inlets 95); the positioning piston 91 (check valve) 90 is instead provided without the second exhaust hole 911, instead of the blow-by gas plug 92, (the positioning piston 91 may of course also be provided with the second exhaust hole 911 and the blow-by gas plug 92). The cup 56 and the row of air intake holes 95 of the center housing 50 are positioned in the axial and circumferential up-and-down movement tracks of the positioning piston 91 (check valve) 90 along the cup wall of the cup 56, the center housing 50 and the cup 56 are respectively provided with a row of air intake holes 95 in the axial and circumferential space dimension positions, (of course, the cup 56 and the second housing 21 can be provided without arranging the row of air intake holes 95), the first row of air intake holes 55 are positioned in the axial and circumferential space dimension positions along the center housing, the corresponding hinge is self-positioned at the starting point of the 90-degree positioning angle of the preset positioning angle, and the self-positioning is performed at the starting point of the 90-degree positioning angle of the hinge, namely, the hinge rotates to the starting point of the 90-degree positioning angle of the preset positioning angle, and the air intake holes 33 are self-positioned at the starting point of the 90-degree positioning angle of the preset positioning angle, and the self-closing is performed at the self-positioning angle of the air intake holes of the preset positioning angle of the hinge, namely, the air intake holes 33 are self-positioning piston 91 (check valve) and the positioning spring 83 and the first row 55 are correspondingly arranged at the air intake holes of the hinge at the preset positioning angle. The positioning piston 91 is a one-way valve 90. 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, 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); 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 second sleeve row of air inlet holes, 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 cup body and the second sleeve row of air inlet holes (the center sleeve). The bearing arranged between the first spring and the fixed rod is changed into a gasket, and the bearing can be used. The spiral ring 43 is fixedly connected in the second shaft sleeve 21 (the center sleeve) in a non-sliding manner by fixedly connecting the screw 98 (of course, the spiral ring 43 is not required to be arranged in the center sleeve), the spiral ring 43 is positioned under the screw sleeve 40, the screw 31 is screwed through the spiral ring 43 and then is screwed with the screw sleeve 40, so that the spiral ring 43 can limit and control the screw 31 to rotationally slide and move relative to the screw sleeve 40, and the generated space dimension coefficient is the axial and circumferential dimension space position capable of positioning the screw sleeve/fixing rod to rotate and slide along the axis, so that the blade matched with the hinge can be set at a positioning angle in a free preset manner relatively. The threaded sleeve is fixedly connected in the other first shaft sleeve 11 through a fixedly connected screw 98 and is rotationally connected in one end of the second shaft sleeve 21, and the plug 60 is fixedly connected in the second shaft sleeve 21 through the fixedly connected screw 98 and is connected in one end of the other first shaft sleeve 11 of the first shaft sleeve 11, so that the first hinge and the second hinge can rotate relatively.

The sleeve 40 is rotatably and non-slidably coupled within the center sleeve 50, the other first bush 11 of the first hinge 10 is fixedly connected to a portion of the threaded sleeve 40 extending beyond the central sleeve 50, for example: the fixed screw 98 is screwed into the fixed screw sleeve 40 after penetrating through the first shaft sleeve 11, so that the first shaft sleeve 11 and the screw sleeve 40 are fixedly connected together, the first hinge and the first shaft sleeve can also limit the axial movement of the screw sleeve 40, and the axial and circumferential dimension spacing positions of the positioning screw sleeve/fixing rod capable of rotating and sliding along the axis are relatively ensured to be self-positioned at a preset positioning angle of the blade 12 of the matched hinge 10. The plug 60 is screwed into the central sleeve 50 through the fixing screw 98 to lock and fix the plug 60, so that the plug 60 is fixedly connected in the central sleeve 50, and the other first shaft sleeve 11 of the first hinge 10 is connected with the part of the plug 60 extending out of the central sleeve 50.

The hinge can rotate relative to the shaft sleeve axis of the hinge after being opened, so that the exhaust piston arranged on the fixed rod in the center sleeve can move downwards towards the positioning piston 91 relative to the screw sleeve in a spiral way, and meanwhile, the gas in the air pressure chamber is discharged outwards through the first row of air inlets, the cup body and the second shaft sleeve (center sleeve) row of air inlets are discharged outwards, and at the moment, the first spring compresses and stores energy; the exhaust piston in the shaft sleeve of the hinge continuously slides downwards spirally relative to the axis of the screw sleeve, so that after the exhaust piston slides downwards to pass through the first row of air inlet holes, air in the air pressure chamber is discharged outwards through the cup body and the second shaft sleeve (the central sleeve) row of air inlet holes, so that the exhaust piston in the central sleeve can correspond to the positioning piston (the one-way valve) and the positioning spring and the first row of air inlet holes, an air pressure chamber can be formed, the elastic force of the first spring, the self gravity of the first spring and the exhaust piston in the air pressure chamber can correspond to the positioning piston and the positioning spring, so that the exhaust piston in the air pressure chamber can generate air pressure and suction force to balance, 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, the exhaust piston in the air pressure chamber does not slide out (exit) from the first row of air inlet holes from bottom to top in the air pressure chamber, so that the exhaust piston in the air pressure chamber can correspond to the positioning piston (the one-way valve) and the positioning spring, in the process, the elasticity, self gravity, air pressure and suction force of the first spring borne by the exhaust piston in the air pressure chamber are balanced, the positioning piston (the one-way valve) and the positioning spring can be relatively driven by the air pressure generated by the suction force of the exhaust piston, the exhaust piston is driven from bottom to top and slides upwards along the cup wall in the cup body, after the hinge stops self-positioning at a preset angle 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 second sleeve (the center sleeve) and the air inlet holes of the cup body, after the hinge stops at a preset positioning angle and self-positions, the compression energy storage elastic force of the positioning spring changes, 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 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 can prop against the positioning piston, so that the third spring is matched with the positioning spring, the positioning piston (one-way valve) can prop against each other to reset, or the third spring is matched with the positioning spring, the positioning piston (one-way valve) can prop against each other to reset, so that outside air can be isolated from entering the air pressure chamber from the center sleeve and the air outlet hole of the cup body, and the positioning piston is balanced by the atmospheric pressure generated by the suction force of the air outlet piston, so that the exhaust piston in the center sleeve can correspond to the positioning piston (one-way valve) and the positioning spring, and the exhaust piston can be self-positioned in the air pressure chamber, as long as the exhaust piston does not slide out (withdraw) from the first row of air inlets, the air pressure chamber can be automatically positioned by matching with the hinge at a preset positioning angle. The more the strength of the energy storage elasticity and the pretightening force of the positioning spring in the air pressure chamber are strong, the stronger the propping elastic strength 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 strength of the atmospheric pressure generated by the suction force of the exhaust piston in the air pressure chamber is, and the stronger the positioning strength of the blade of the hinge at the preset angle is. Before the exhaust piston slides from bottom to top and does not slide out of (withdraw from) the first row of air inlet holes, the hinge can realize self-positioning, after the exhaust piston slides over (withdraw from) the first row of air inlet holes, the outside air of the center sleeve enters the air pressure chamber from the first row of air inlet holes in the middle of the dimension, and 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 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 be self-positioned in a preset positioning angle of 80-180 degrees.

Wherein: the central sleeve of the hinge can form an air pressure chamber, and the following circulation movement flow details are required for freely preset setting the positioning angle, when the hinge blade is opened, the hinge blade is rotatably and non-slidably connected in the central sleeve 50 through the threaded sleeve 40, the first shaft sleeve 11 of the first hinge 10 is fixedly connected with the part of the threaded sleeve 40 extending out of the central sleeve 50, and the fixedly connection is as follows: the fixed screw 98 is threaded through the first sleeve 11 to lock the fixed screw 40, the first hinge and the upper end of the first sleeve can limit the axial movement of the sleeve 40 to position the axial and circumferential size spacing positions of the screw sleeve/rod rotating and sliding along the axis, the screw rod in the sleeve of the hinge and the screw sleeve are matched to rotate relatively, so that the rod in the sleeve can slide relatively to the axis when rotating relatively to the screw sleeve, the first spring 81 in the center sleeve is propped between the bottom end surface of the 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 56 and is propped in the cup 56 in a sealing way, the air inlet hole 55 is arranged in the axial and circumferential size spacing positions of the center sleeve, and a leak-proof sealing ring is sleeved on the outer rotary surface of the cup wall of the cup body, and the screw rod 43 is screwed in through the second sleeve 21 by a fixed screw 98 to lock the screw ring 43, so that the screw ring 43 can not be connected and fixed in the center sleeve 50 in a sliding way, the screw ring 43 is positioned under the screw sleeve 40, the screw rod 31 is screwed through the screw ring 43 and then is screwed with the screw sleeve 40, so that the screw ring 43 can limit and control the screw rod 31 to rotate, slide and move relative to the screw sleeve 40, the generated space size coefficient is used for positioning the axial and circumferential size space positions of the screw sleeve/fixed rod which can rotate and slide along the axis, the sealing ring is sleeved outside the fixed rod, the sealing ring forms the exhaust piston, the gap between the opening of the cup body 56 and the sealing cup body through the center seat 82, the first shaft sleeve 11 of the first hinge 10 is connected with the part of the plug 60 extending out of the central sleeve 50 through the plug 60 which is screwed into the locking plug 60 through the central sleeve 50 by the fixing screw 98, so that the plug 60 is fixedly connected in the central sleeve 50, one end of the third spring is propped against the positioning piston, 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 axis of the hinge when being opened, the exhaust piston of the fixing rod can slide downwards and move towards the positioning piston 91 relative to the screw sleeve, gas in the air pressure chamber is discharged outwards through the first row of air inlets and outwards through the air outlets of the cup body and the central sleeve, meanwhile, the first spring compresses and stores energy, the hinge continues to rotate relative to the other hinge axis, so that the gas in the air pressure chamber is discharged outwards through the air outlets of the cup body and the central sleeve after the exhaust piston slides through the first row of air inlets, and the air inlets can form the air pressure chamber relatively in the central sleeve of the hinge. Wherein: the central sleeve 50 is provided with a first row of air inlet holes penetrating inside and outside along the axis and the axial direction and the circumferential direction, so that the exhaust piston can correspond to the one-way valve, the positioning spring and the first row of air inlet holes 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, the corresponding hinge is self-positioned at the starting point of a 90-degree positioning angle of a preset positioning angle, and a boundary point which can be self-closed under the 90-degree positioning angle, namely, when the hinge rotates to a starting point of the 90-degree positioning angle with a preset setting positioning angle to self-position, and the boundary point which can be self-closed under the 90-degree positioning angle, the vent piston corresponds 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 enable the hinge to be self-positioned in a 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 positioning angle of 90 degrees, and the hinge can be freely preset to set the positioning angle.

Example III

It is similar to embodiment II the difference is that: referring to fig. 32 to 38, the hinge is a primary-secondary hinge assembly, the first hinge 10 is provided with a first blade 12 and two first bushings 11 fixedly connected to the first blade 12 at intervals, and the second hinge 20 comprises a second blade 22 and a second bushing 21 fixedly connected to the second blade 22. The first shaft sleeve 11 of the first hinge 10 is fixedly connected to the upper end and the lower end of the first blade 12, the second shaft sleeve 21 is fixedly connected to the middle of the second blade 22, a notch is formed in the middle of the first blade 12, and the second blade 22 is matched with the notch. The wheelbase of the second sleeve 21 is adapted to the distance between the two first sleeves 11, and the second sleeve 21 is adapted to fit between the two first sleeves 11. The screw sleeve 40 is fixedly connected in the first shaft sleeve 11 through a fixedly connected screw 98 and is rotatably connected in one end of the second shaft sleeve 21; the plug 60 is fixedly connected to the second sleeve 21 by a fixing screw 98 and the portion extending out of the central sleeve 50 is connected to the other first sleeve 11, so that the first hinge and the second hinge can rotate relatively. The second sleeve 21 forms a central sleeve 50, and the central sleeve 50 is provided with a first row of air inlet holes penetrating inside and outside along the axial direction and the circumferential direction, so that the exhaust piston can correspond to the one-way valve, the positioning spring, the air leakage plug and the first row of air inlet holes 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 axis of the center sleeve and the axis of 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 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 boundary point is under the 90-degree positioning angle and capable of self-closing, the air exhaust piston corresponds to the one-way valve, the positioning spring and the first row of air inlets so as 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 freely self-position in the preset positioning angle of 90-180 degrees. The spiral ring 43 is fixedly connected in the second shaft sleeve 21 (the central sleeve) in a non-sliding way by fixedly connecting a screw 98, wherein the spiral ring 43 is positioned below the threaded sleeve 40, the screw 31 is screwed through the spiral ring 43 and then is screwed with the threaded sleeve 40, so that the spiral ring 43 can limit and control the screw 31 to rotationally slide and move relative to the threaded sleeve 40, and the generated space dimension coefficient is the axial and circumferential dimension space position capable of positioning the threaded sleeve/fixed rod to rotate and slide along the axis, and is self-positioning relative to the positioning angle capable of ensuring the free preset arrangement of the blades 12 of the matched hinge 10. The threaded sleeve is fixedly connected in the other first shaft sleeve 11 through a fixedly connected screw 98 and is rotationally connected in one end of the second shaft sleeve 21, and the plug 60 is fixedly connected in the second shaft sleeve 21 through the fixedly connected screw 98 and is connected in the other first shaft sleeve 11 of the first shaft sleeve 11, so that the first hinge and the second hinge can rotate relatively. The plug 60 is fixedly connected in the second shaft sleeve 21 through a fixedly connected screw 98 and is connected in one end of the other first shaft sleeve of the first shaft sleeve 11, the threaded sleeve 40 is fixedly connected in the other first shaft sleeve 11 through the fixedly connected screw 98 and is rotatably connected in one end of the second shaft sleeve 21, and the threaded sleeve is spaced from the plug; a fixed rod, a first spring, a center seat, a positioning spring, a 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 one-way valve, the one-way valve is arranged in the center sleeve in a sealing way, and the air pressure chamber is formed by the air exhaust piston, the one-way valve, the positioning spring, the air leakage plug 92 and the first row of air inlets.

The screw sleeve 40 is rotatably and non-slidably connected to the inside of the center sleeve 50, and a portion of the screw sleeve 40 extending outside of the center sleeve 50 is fixedly connected to the first sleeve 11, for example: the fixedly-connected screw 98 is arranged to be screwed into the locking screw sleeve 40 through the first shaft sleeve 11, so that the first shaft sleeve 11 and the screw sleeve 40 are fixedly connected together, the first hinge and the first shaft sleeve can also limit the axial movement of the screw sleeve 40, and the axial and circumferential size spacing positions of the screw sleeve/fixing rod which rotate and slide along the axis can be positioned, so that the hinge can be self-positioned and self-closed. The plug 60 is screwed into the central sleeve 50 through the fixing screw 98 to lock the plug 60 into the central sleeve 50, so that the plug 60 is fixed in the central sleeve 50, and the other first shaft sleeve 11 of the first hinge 10 is connected with the part of the plug 60 extending out of the central sleeve 50.

Through the first row of air intake holes 55, disposed at spaced positions along the axial and circumferential dimensions of the center sleeve 50 and the sleeve 11, and rotatably and non-slidably connected within the center sleeve 50 through the sleeve 40, the first sleeve 11 of the first hinge 10 and the portion of the sleeve 40 extending beyond the center sleeve 50 are fixedly secured, for example: the first hinge and the first sleeve can also limit the axial movement of the threaded sleeve 40 by arranging a fixing screw 98 to be screwed into the locking and fixing threaded sleeve 40 through the first sleeve 11, so as to position the axial and circumferential size spacing positions of the threaded sleeve/fixing rod rotating and sliding along the axis, and to enable relative rotating sliding by the screw 31 in the hinge 10 and the sleeve 11 and the threaded sleeve 40 in a screw connection fit, and to be locked into the threaded ring 43 by the fixing screw 98 to be screwed into the threaded ring 43 through the second sleeve 21, so that the threaded ring 43 is fixedly connected in the central sleeve 50 in a non-sliding manner, the threaded ring 43 is positioned under the threaded sleeve, the threaded rod 31 is screwed into the threaded ring 43 and then screwed into the threaded sleeve 40, so that the threaded ring 43 can limit and control the rotating sliding and moving of the threaded rod 31 relative to the threaded sleeve 40, the generated spacing size coefficient, the axial and circumferential dimension spacing positions which can rotate and slide the positioning screw sleeve/fixing rod along the axis are adopted, so that the fixing rod 30 in the center sleeve 50 can rotate and slide relative to the screw sleeve 40, so that fixed axial and circumferential dimension spacing spiral downwards moves towards the one-way valve 90, simultaneously, the air in the air pressure chamber is outwards discharged through the first row of air inlets 55 and the second air outlet 911 of the one-way valve 90, the air outlet piston 33 slides downwards through the first row of air inlets 55, simultaneously, the air in the air pressure chamber is outwards discharged through the second air outlet 911 of the one-way valve 90, so that the air outlet piston 33 in the center sleeve can correspond to the one-way valve 90, the air leakage plug 92, the positioning spring 83 and the first row of air inlets 55, so that an air pressure chamber can be formed, the air outlet piston in the air pressure chamber can generate air pressure and (suction force) balance, so that the hinge can realize self-closing.

The screw 31 of the fixing rod 30 is screwed with the screw sleeve 40 and the fixing rod 30 is provided with the exhaust piston 33, the vent piston 33 is sealingly slidably received within the center housing 50. The center seat 82 is fixedly connected to the opening of the cup 56 and seals the gap between the cup opening and the center sleeve.

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 abuts against the gasket, and the other end abuts against the bottom of the cup, (the check valve 90 is the positioning piston 91). The cup 56 is provided with a step 561 against which the positioning piston abuts for limiting the movement of the positioning piston in a direction approaching the third spring. The end face of the second exhaust hole 911 is concavely arranged in a taper hole from large to small relative to the gasket direction, 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 leak-proof sealing ring 912 is in sliding sealing contact with the wall of the cup body. When the exhaust piston rotates downwards in a spiral way, gas in the air pressure chamber extrudes the peripheral wall of the second exhaust hole, so that a gap is formed between the peripheral wall of the second exhaust hole and the blocking column 922, the gas is discharged through the gap between the peripheral wall of the second exhaust hole and the blocking column 922, the gasket 921 and the blocking column 922 are retreated through the extrusion of the exhaust gas, a gap is formed between the gasket and the bottom wall of the positioning piston, the gap between the gasket and the bottom wall of the positioning piston is discharged, and after the discharge, one end of the third spring can prop against the bottom of the cup body under the action of the energy storage elasticity and self elasticity of the third spring, and the other end of the third spring can prop against the gasket 921 and the blocking column 922 to be reset to the peripheral wall of the surface of the positioning piston, so that external air is isolated and prevented from penetrating into the air pressure chamber from the second exhaust hole 911.

The fixed 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, the annular mounting groove 321 is sleeved with a leakage-proof sealing ring 322, the leakage-proof sealing ring 322 also extends out of the annular mounting groove 321 to be in sealing sliding connection with the center sleeve, and forms the exhaust piston. 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, correspondingly 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 force and the self-closing speed. The adjusting seat 70 is, for example, a screw rod, which is screwed through the plug and is connected with the bottom of the cup body, for example, the screw rod is provided with a step surface, the step surface is propped against the bottom surface of the bottom of the cup body, the screw rod can rotate through the opening of the bottom of the cup body, and a nut is further arranged to be screwed on the tail end of the screw rod and is propped against the top surface of the bottom of the cup body.

In this embodiment: the screw ring 43 is fixedly locked in the central sleeve 50 by screwing a fixedly-connected screw 98 into the second sleeve 21, so that the screw ring 43 is fixedly connected in a non-sliding manner, the screw ring 43 is positioned below the screw sleeve 40, the screw rod 31 is screwed through the screw ring 43 and then is screwed with the screw sleeve 40, so that the screw ring 43 can limit and control the screw rod 31 to rotationally slide and move relative to the screw sleeve 40, and the generated interval size coefficient can position the axial and circumferential size interval positions of the rotation and sliding of the screw sleeve/fixed rod; 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 by which the plug 60 is connected and secured in the center housing in a rotationally fixed and slidable manner. 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 leak-proof seal 824 also 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. The center seat 82 and cup 56 are coupled together by a set screw 98. 322. 824, 912, 562 are all resilient and may also be made of resilient materials. The peripheral surface of the outer rotary surface of the cup wall of the cup body is concavely provided with an annular mounting groove 560, the mounting groove 560 is sleeved with a leakage-proof sealing ring 562, and the leakage-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 first blade 12 of the first hinge 10 of the hinge can rotate relative to the axis of the second hinge 20 after being opened by external force, so that the exhaust piston 33 of the fixed rod 30 in the second sleeve 21 can slide downwards relative to the screw sleeve in a spiral manner to move towards the one-way valve 90, and at the same time, the air in the air pressure chamber is discharged outwards through the first row of air inlets and is discharged outwards through the second air outlet 911 of the one-way valve, and at the moment, the first spring compresses and stores energy; the first hinge 10 can continue to rotate relative to the axis of the second hinge 20 after being opened, so that the exhaust piston 33 of the fixed rod 30 in the second sleeve 21 can continuously slide downwards in a spiral manner relative to the threaded sleeve and slide through the first row of air inlets 55, at the moment, air in the air pressure chamber is discharged outwards through the one-way valve, so that the exhaust piston can correspond to the one-way valve, the positioning spring, the leakage blocking 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 fixed rod and the air pressure (suction force) of the air pressure chamber are balanced, and the exhaust piston in the air pressure chamber is matched with the positioning piston and the positioning spring, so that the exhaust piston in the air pressure chamber generates air pressure and (suction force), and the hinge can realize self positioning in the process. Before the hinge is closed by external force to enable the hinge to rotate relative to the hinge axis, the exhaust piston in the air pressure chamber does not slide out (withdraw) from the air pressure chamber to the air inlet hole, so that the exhaust piston in the air pressure chamber can correspond to the positioning piston and the positioning spring, in the process, the elastic force, self gravity, air pressure and (suction force) of the first spring borne by the exhaust piston of the fixed rod in the air pressure chamber are relatively changed, so that one end of the third spring can prop against the bottom of the cup body, the other end of the third spring is relatively pushed up and slides up from the bottom, after the hinge blade stops at a preset positioning angle, the compression energy storage elastic force of the positioning spring is changed, so that the top center seat can prop against the positioning piston (one-way valve) to the step propped by the positioning piston (one-way valve), and the air pressure is changed by the suction force of the exhaust piston, and when the third spring is pushed up from the bottom and slides up from the bottom, one end of the third spring can prop against the bottom of the cup body, the other end of the third spring can relatively plug up, the other end of the third spring can slide up from the air inlet hole is opposite to the air inlet hole, and the air cylinder can be reset to the air outlet hole (one-way valve) can be matched with the air inlet hole, and the air cylinder can be closed, and the air pressure can be matched with the air outlet hole can be positioned up from the air inlet hole, and can be closed up at the air outlet hole, and the air cylinder can be closed at the air outlet hole, and the air outlet hole can be closed, and the air can be closed up, and the air pressure can be closed and the air pressure can and air can be closed up and air easily and air, and air can and air. The more the energy storage elasticity and the pretightening force intensity of the positioning spring in the air pressure chamber are strong, the stronger the propping elastic 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 blade of the hinge at a preset positioning angle is. 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 be self-positioned in a preset positioning angle of 80-180 degrees.

### The central sleeve of the hinge can form an air pressure chamber, and the necessary conditions of the free preset setting positioning angle are the following circulation movement process details, when the hinge blade is opened, the hinge blade is screwed into the lock-in sleeve through the first sleeve by the fixed screw, so that the sleeve is fixedly connected and connected in the second sleeve in the first sleeve, the upper end of the first sleeve of the first hinge can limit the axial movement of the sleeve 40, the axial and circumferential size spacing positions of the rotation and sliding of the screw sleeve/the fixed rod can be positioned, the screw joint of the screw rod in the sleeve of the hinge and the screw sleeve can be matched to rotate relatively, the fixed rod in the sleeve can rotate relatively to the screw sleeve, the fixed rod in the sleeve can also rotate relatively to the axis, 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, the positioning spring 83 is propped between the central seat 82 and the one-way valve 90, the positioning piston 91 is arranged in the cup 56 and is propped in the cup 56 by the positioning piston, the axial and axial spacing position of the first row 55 along the central sleeve and the axial spacing position of the sleeve, the sealing plug 60 is arranged by the axial and the axial spacing position of the first row 55 along the central sleeve, the sealing plug is arranged by the sealing plug 60, the sealing plug 60 is formed by the sealing plug 60 and the sealing plug 60 is connected to the end of the sealing plug 60 through the sealing plug 60 and the central sleeve 60, the sealing plug 60 is formed by the sealing plug 60 and the sealing plug 60, the sealing plug 60 is connected to the sealing plug 60 through the sealing plug 60 and the sealing plug 60, the other end can prop against the cup bottom of the cup body, so that the hinge blade can rotate relative to the shaft sleeve axis of the hinge when being opened, the exhaust piston arranged on the fixed rod can slide downwards relative to the screw sleeve in a spiral manner, the exhaust piston moves downwards towards the one-way valve 90, meanwhile, gas in the air pressure chamber is discharged outwards through the first exhaust hole and is discharged outwards through the second exhaust hole 911 of the one-way valve 90, meanwhile, the first spring compresses and stores energy, the hinge continues to rotate relative to the hinge axis, and after the exhaust piston passes through the first exhaust hole, 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 air pressure chamber can be formed. Wherein: the central sleeve 50 is provided with a first row of air inlet holes which penetrate inside and outside along the axis and the axial direction and the circumferential direction, so that the exhaust piston can correspond to the one-way valve, the positioning spring, the leakage blocking and the first row of air inlet holes 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 which can be self-closed below 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 limiting point is below the 90-degree positioning angle and can self-close, the air exhaust piston can correspond to the check valve, the positioning piston, 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 freely self-position in the preset positioning angle of 90-180 degrees, and the hinge can self-close relatively to freely preset positioning angle below the 90-degree 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 (7)

1. The pneumatic type self-positioning and self-closing hinge, comprises two hinges, a fixed rod and a threaded sleeve, each hinge is provided with a shaft sleeve and a blade fixedly connected outside the shaft sleeve, the two hinges can rotate relatively, and the fixed rod is provided with a screw rod; it is characterized in that the method comprises the following steps: 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 dimension spacing position; the center sleeve is sleeved in the shaft sleeves of the two hinges; 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 check valve is hermetically arranged in the center sleeve, and an air pressure chamber is formed between the exhaust piston and the check valve; wherein: the exhaust piston moves towards the one-way valve, air in the air chamber is discharged outwards through the first row of air inlets and the one-way valve, and after the exhaust piston slides through the first row of air inlets, the air in the air chamber is discharged outwards through the one-way valve;

A sealing ring is sleeved outside the fixed rod, and the sealing ring forms the exhaust piston;

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.

2. The pneumatic self-positioning and self-closing hinge as claimed in claim 1, wherein: 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.

3. The pneumatic self-positioning and self-closing hinge as claimed in claim 2, wherein: the center seat is an exhaust bolt.

4. The pneumatic self-positioning and self-closing hinge as claimed in claim 3, wherein: 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.

5. The pneumatic self-positioning and self-closing hinge as claimed in claim 4, 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.

6. The pneumatic self-positioning and self-closing hinge as claimed in claim 5, 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.

7. The air pressure type self-positioning and self-closing hinge comprises a first hinge, a second hinge, a fixed rod and a threaded sleeve, wherein the first hinge is provided with a first blade and two first shaft sleeves fixedly connected with the first blade at intervals, the second hinge comprises a second blade and a second shaft sleeve fixedly connected with the second blade, the second shaft sleeve is adaptively matched between the two first shaft sleeves, the first hinge and the second hinge can rotate relatively, and the fixed rod is provided with a screw; the method is characterized in that: the plug is fixedly connected in a first shaft sleeve and is rotationally connected in one end of a second shaft sleeve, the plug is fixedly connected in the second shaft sleeve and is connected in one end of another first shaft sleeve, the second shaft sleeve forms a central sleeve, the central sleeve is provided with a first row of air inlets which penetrate inside and outside, and the cup body and the shaft sleeve are respectively provided with a row of air inlets which penetrate inside and outside along the dimension interval positions of the axis, the axial direction and the circumferential direction; the plug is fixedly connected in the other end of the center sleeve, 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 inlet holes, the cup body and the central sleeve row of air inlet holes, 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 cup body and the central sleeve row of air inlet holes.