Upper door axis with self-closing and self-positioning function

Abstract

The present invention discloses an upper door shaft with self-closing and self-positioning functions, including a positioning adjustment component, wherein the positioning adjustment component, the rotating working component and the connecting section are all provided with cavities and are interconnected to form an integral cavity, and a self-positioning mechanism is provided in the integral cavity, and the self-positioning mechanism includes a floating positioning head and a positioning cam rotatably provided in the rotating working component, and a plurality of positioning grooves are provided on the positioning cam, and the positioning head always keeps in contact with the outer side of the positioning cam, and a hydraulic circulation structure for controlling the self-closing speed is provided in the integral cavity, and a revolving door self-closing structure is provided in the limited space inside the upper door shaft of the revolving door, which saves installation space while realizing the self-closing function and greatly improves the aesthetics, and utilizes the circulation channel of the hydraulic oil in the upper door shaft structure to control the self-closing speed of the revolving door, and the opening and closing speed of the revolving door is easy to adjust and is stable and smooth, which greatly improves the user experience.

Description

Technical Field

[0001] The invention relates to the field of revolving door installation, in particular to an upper door shaft with self-closing and self-positioning functions. Background Art

[0002] Existing revolving doors require continuous external force to close, especially when closing. While some have a self-closing function, their structure is awkward and unsightly. Furthermore, the closing speed is difficult to adjust, and the door opening and closing action is not stable and smooth, resulting in a poor user experience. Therefore, we developed a door hinge with self-closing and self-positioning functions. Summary of the Invention

[0003] The purpose of the present invention is to provide an upper door shaft with self-closing and self-positioning functions.

[0004] The technical problems solved by the present invention are:

[0005] (1) How to set a revolving door self-closing structure within the limited space inside the upper door shaft of the revolving door to achieve the self-closing function while saving installation space and improving aesthetics;

[0006] (2) How to use the circulation channel of hydraulic oil in the upper door shaft structure to control the self-closing speed of the revolving door, so as to solve the problems of inconvenient adjustment of the self-closing speed and poor stability and smoothness of door opening and closing;

[0007] (3) How to set the leakage structure to compensate the volume of the hydraulic oil chamber in real time and solve the problem of hydraulic oil leakage during the self-positioning force adjustment of the positioning spring.

[0008] The present invention can be implemented through the following technical solution: an upper door shaft with self-closing and self-positioning functions, including a positioning adjustment component and a rotating working component and a connecting section that fixedly connects the two, the positioning adjustment component, the rotating working component and the connecting section are all provided with cavities and are interconnected to form an overall cavity, a self-positioning mechanism is provided in the overall cavity, the self-positioning mechanism includes a floating positioning head and a positioning cam rotatably provided in the rotating working component, a plurality of positioning grooves are provided on the positioning cam, the positioning head always maintains contact with the outer side of the positioning cam, and a hydraulic circulation structure for controlling the self-closing speed is provided in the overall cavity.

[0009] A further technical improvement of the present invention is that when the revolving door is fully opened, the positioning ball rollingly arranged at the end of the positioning head cooperates with the positioning groove on the long side of the positioning cam to position the revolving door.

[0010] A further technical improvement of the present invention is that a positioning spring is provided on one side of the positioning head. During the closing process of the rotary door, the positioning ball at the end of the positioning head is transferred from the long side of the positioning cam to the short side under the action of the positioning spring to contact the positioning cam.

[0011] A further technical improvement of the present invention is that the hydraulic circulation structure includes two hydraulic circulation channels and a first hydraulic oil chamber and a second hydraulic oil chamber separated by a positioning head. During operation, the first hydraulic oil chamber and the second hydraulic oil chamber are connected or closed through the two hydraulic circulation channels.

[0012] A further technical improvement of the present invention is that: one of the hydraulic circulation channels includes a throttling threaded hole, an oil channel and a hydraulic oil flow hole opened on the rotating working housing in the rotating working assembly, the throttling threaded hole connects the second hydraulic oil chamber and the oil channel, the hydraulic oil flow hole connects the first hydraulic oil chamber and the oil channel, when the rotating door is opened, the hydraulic oil flows from the first hydraulic oil chamber through the hydraulic oil flow hole, the oil channel and the throttling threaded hole into the second hydraulic oil chamber, when the rotating door is closed, the hydraulic oil flows in the opposite direction.

[0013] A further technical improvement of the present invention is that: the other hydraulic circulation channel includes a channel connecting sleeve threadedly connected to one side of the positioning head, a floating sleeve is slidingly arranged inside the positioning head, a rubber sealing sheet is fixedly arranged at one end of the floating sleeve, and a thrust spring is arranged at the other end of the floating sleeve. In a static state, the rubber sealing sheet abuts against the end of the channel connecting sleeve under the action of the thrust spring. When the revolving door is opened, the hydraulic oil pushes away the rubber sealing sheet that blocks the internal channel of the channel connecting sleeve, and the hydraulic oil enters the second hydraulic oil chamber from the first hydraulic oil chamber through the channel connecting sleeve. When the revolving door is closed, the rubber sealing sheet always blocks the channel connecting sleeve.

[0014] A further technical improvement of the present invention is that a notch is provided in the throttling threaded hole, and an adjusting screw is provided in the throttling threaded hole to change the size of the notch and control the flow rate of the hydraulic oil.

[0015] A further technical improvement of the present invention is that a threaded adjustment sleeve for adjusting the elastic force of the positioning spring is provided in the positioning adjustment assembly, and a sealing piston head is floatingly provided in the inner cavity of the other end of the threaded adjustment sleeve.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The positioning spring applies force to the positioning head, and the positioning ball applies force to the arc-shaped side wall of the positioning cam, so that the positioning cam continues to rotate without the help of external force. As a result, the revolving door can automatically close with the help of this force when the external force is lost. The entire structure is set inside the upper door shaft, making full use of the installation space, the overall structure is beautiful, and the user experience is improved.

[0018] 2. When closing the door, the positioning spring is used to move the positioning head toward the positioning cam. The hydraulic oil in the second hydraulic oil chamber is squeezed and flows through the throttling threaded hole, the oil channel, and the hydraulic oil flow hole to the first hydraulic oil chamber. An adjusting screw is provided in the throttling threaded hole to adjust the size of the damaged gap in the throttling threaded hole, thereby controlling the speed at which the hydraulic oil is transferred from the first hydraulic oil chamber to the second hydraulic oil chamber, and further controlling the self-closing speed of the revolving door, thereby improving the safety factor and making the entire closing process more stable and smooth.

[0019] 3. When the door is opened, the positioning head squeezes the positioning spring and moves away from the positioning cam. After the hydraulic oil in the first hydraulic oil chamber is squeezed, it enters the second hydraulic oil chamber through the channel formed by the oil flow hole, oil channel and throttling threaded hole. On the other hand, it enters the second hydraulic oil chamber through the internal channel of the channel connecting sleeve, realizing a dual-channel oil circuit circulation, which greatly accelerates the flow speed of the hydraulic oil, thereby greatly reducing the resistance encountered during the opening process of the revolving door and enhancing the user experience.

[0020] 4. When adjusting the self-positioning force of the positioning spring, the space of the first hydraulic oil chamber will change. By setting the sealing piston head in a floating manner, the pressure generated by the hydraulic oil will push the sealing piston head to move and cause the discharge spring to elastically deform, thereby compensating for the volume of the first hydraulic oil chamber and avoiding the problem of being unable to adjust the self-positioning force due to the presence of hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the external overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 A-direction cross-sectional diagram in FIG;

[0025] Figure 4 This is a schematic diagram of the internal structure connection of the positioning head of the present invention;

[0026] Figure 5 This is a connection diagram of the self-positioning state of the present invention;

[0027] Figure 6 This is a schematic diagram of the hydraulic oil flow cavity structure of the present invention;

[0028] Figure 7 This is an exploded schematic diagram of the rotary working assembly structure of the present invention;

[0029] Figure 8 It is a schematic diagram of the connection structure of the mounting sleeve and the complete gear sleeve of the present invention.

[0030] In the figure: 1. Positioning and adjustment assembly; 2. Connecting section; 3. Rotating working assembly; 100. Positioning and adjustment housing; 200. Connecting housing; 300. Rotating working housing; 101. Threaded rotating member; 102. Threaded adjustment sleeve; 103. Limiting ring; 104. Positioning spring; 105. Positioning head; 106. Channel connecting sleeve; 107. Adjusting bevel gear member; 1051. Floating sleeve; 1052. Rubber sealing sheet; 1053. Thrust spring; 1054. Positioning ball bearing; 1055. First mounting cavity; 1021. Spring washer; 1022. Second mounting cavity; 1023. Discharge spring; 1024. Sealing piston head; 201. Connecting inner cavity; 301. Mounting cover; 302. Linking rod; 303. Telescopic pin; 304. Return spring; 305. Mounting sleeve; 306. Threaded sleeve; 307. Adjusting bolt; 308. Complete gear sleeve; 309. Positioning cam; 310. Gear; 312. Mounting cavity; 313. Telescopic adjustment cavity; 314. Semicircular limiting groove; 315. Positioning movable cavity; 316. Throttling threaded hole; 317. Hydraulic oil circulation hole; 3051. Spring limiting protrusion; 3091. Positioning groove. DETAILED DESCRIPTION

[0031] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0032] See also Figures 1-8As shown, the upper door shaft with self-closing and self-positioning functions includes a positioning adjustment component 1 and a rotating working component 3. A connecting section 2 is provided between the positioning adjustment component 1 and the rotating working component 3 and is fixedly connected through the connecting section 2. Specifically, the positioning adjustment component 1 is connected to the connecting section 2 by bolts, and the connecting section 2 is connected to the rotating working component 3 by bolts. An inner cavity is provided in the positioning adjustment component 1, the connecting section 2 and the rotating working component 3, and the three are interconnected. The connecting section 2 is specifically a connecting shell 200, and the inner cavity provided in the connecting shell 200 is marked as a connecting inner cavity 201, and the inner cavity provided in the rotating working component 3 is marked as a positioning activity cavity 315;

[0033] The positioning adjustment assembly 1 includes a positioning adjustment housing 100, a threaded rotating member 101 is rotatably provided in the cavity of the positioning adjustment housing 100, one end of the threaded rotating member 101 is provided with a first conical tooth surface, and the other end is provided with an external thread, and an adjusting conical tooth member 107 is rotatably installed at a position corresponding to the first conical tooth surface of the threaded rotating member 101, the top of the adjusting conical tooth member 107 is provided with a second conical tooth surface, the second conical tooth surface of the adjusting conical tooth member 107 is meshed and connected with the first conical tooth surface of the threaded rotating member 101, and the end of the adjusting conical tooth member 107 away from the second conical tooth surface passes through the positioning adjustment housing 100 and the end is provided with an inner hexagonal shape, which is convenient for adjustment using a wrench;

[0034] A threaded adjustment sleeve 102 is sleeved on the outer side of one end of the threaded rotating member 101 with an external thread, and an internal thread is provided at one end of the threaded adjustment sleeve 102, so the threaded rotating member 101 and the threaded adjustment sleeve 102 are connected through internal and external threads, and a second installation inner cavity 1022 is provided at the other end of the threaded adjustment sleeve 102, and a spring washer 1021 is provided at the end of the second installation inner cavity 1022 close to the internal thread, and a retaining spring is fixedly provided at the end of the second installation inner cavity 1022 away from the internal thread, and a sealing piston head 1024 is slidingly provided in the second installation inner cavity 1022, and the retaining spring plays a limiting role on the sealing piston head 1024, and a drain is provided between the spring washer 1021 and the sealing piston head 1024. Spring 1023, the two ends of the discharge spring 1023 are respectively in contact with the spring washer 1021 and the sealing piston head 1024, and a limit ring 103 is provided on the outside of the threaded adjusting sleeve 102. A flat surface is symmetrically provided on the outer surface of one end of the threaded adjusting sleeve 102, and a flat surface is also symmetrically provided on the corresponding position of the inner side of the limit ring 103. The corresponding planes of the two are in contact with each other, thereby limiting the rotation of the threaded adjusting sleeve 102. When threaded transmission occurs with the threaded rotating member 101, only translation occurs in the axial direction. It should be noted that a sealing ring is provided between the threaded adjusting sleeve 102 and the connecting inner cavity 201 for sealing, and a sealing ring is also provided between the sealing piston head 1024 and the second installation inner cavity 1022 for sealing;

[0035] The rotating working assembly 3 includes a rotating working shell 300. A positioning movable cavity 315 is opened on the side of the rotating working shell 300 close to the connecting section 2. A positioning head 105 is slidably arranged in the positioning movable cavity 315. A positioning spring 104 is sleeved on the outer side of the threaded adjusting sleeve 102. The two ends of the positioning spring 104 are respectively in contact with the step surface of the threaded adjusting sleeve 102 and the positioning head 105. A plurality of sealing rings are sleeved on the outer side of the positioning head 105. Under the separation effect of the threaded adjusting sleeve 102 and the positioning head 105, the connected connecting cavity 201 and the positioning movable cavity 315 are separated into two hydraulic oil chambers. The space where the positioning spring 104 is located is marked as the first hydraulic oil chamber, and the space between the positioning head 105 and the inner wall of the positioning movable cavity 315 is marked as the second hydraulic oil chamber. A throttling threaded hole 316 and a hydraulic oil circulation hole 317 are provided on the side wall of the positioning movable cavity 315. An oil channel is provided between the throttling threaded hole 316 and the hydraulic oil circulation hole 317 and the oil channel is connected through the oil channel. The throttling threaded hole 316 is a damaged threaded hole, and the second hydraulic oil chamber and the oil channel are connected through its damaged gap, and the first hydraulic oil chamber and the oil channel are connected through the hydraulic oil circulation hole 317. The first hydraulic oil chamber, the second hydraulic oil chamber and the oil channel are filled with hydraulic oil.

[0036] The bottom of the rotating working shell 300 is provided with a mounting cavity 312, and a telescopic adjustment cavity 313 is provided on one side of the mounting cavity 312. The mounting cavity 312 is connected to the positioning movable cavity 315. A positioning cam 309 is rotatably provided in the mounting cavity 312, and a positioning groove 3091 is provided at equal angles on the side of the positioning cam 309. The angle between two adjacent positioning grooves 3091 is 90 degrees, and the arc of each positioning groove 3091 is 30 degrees. The bottom of the positioning cam 309 is fixedly connected to the coaxial center with a gear 310. A mounting sleeve 305 is provided on one side of the positioning cam 309, and a spring limiting protrusion 3051 is fixedly provided on one side of the inner wall of the mounting sleeve 305. The spring limiting protrusion 3051 is fixedly provided on the inner wall of the mounting sleeve 305. 051 is a semi-cylindrical structure with a first reset groove on the top. A telescopic pin 303 is slidably arranged in the mounting sleeve 305. One side of the telescopic pin 303 is set as a plane, and the plane is in contact with the lateral plane of the spring limiting protrusion 3051. A second reset groove is provided on the inner side of the top of the mounting sleeve 305. A reset spring 304 is provided between the first reset groove and the second reset groove. The two ends of the reset spring 304 are respectively in contact with the bottom of the first reset groove and the second reset groove. A complete tooth sleeve 308 is sleeved on the outer side of the mounting sleeve 305. The complete tooth sleeve 308 is fixedly connected to the mounting sleeve 305, and the gear tooth part of the complete tooth sleeve 308 is meshed with the gear 310.

[0037] The telescopic adjustment cavity 313 is provided with a linkage rod 302, and semicircular limiting grooves 314 are symmetrically provided on both sides of the installation cavity 312. The top of the rotating working shell 300 is fixedly connected to the installation cover 301 by screws, and a corresponding semicircular groove is provided at the corresponding position of the bottom of the installation cover 301. The semicircular groove at the bottom of the installation cover 301 and the corresponding semicircular limiting groove 314 form a circular limiting space. The cylindrical protrusions on both sides of the linkage rod 302 are provided in the circular limiting space as the rotation axis of the linkage rod 302, so the linkage rod 302 is rotatably connected to the rotating working shell 300, and the linkage rod A ball bearing is provided at one end of 302, and the linkage rod 302 abuts against the top of the telescopic pin 303 through the ball bearing. A threaded sleeve 306 is provided at the bottom of the end of the linkage rod 302 away from the telescopic pin 303. One side of the threaded sleeve 306 is set as a plane, and the side wall of the corresponding installation part on the rotating working shell 300 is also set as a plane. The corresponding planes of the two fit together to limit their rotation. The threaded sleeve 306 is slidably connected to the rotating working shell 300 in the vertical direction. An adjusting bolt 307 is connected to the internal thread of the threaded sleeve 306, and the adjusting bolt 307 is rotatably connected to the rotating working shell 300.

[0038] One end of the positioning head 105 is provided with a placement cavity, and the other end of the positioning head 105 is provided with a positioning ball 1054 that is rolled. Under the elastic force of the positioning spring 104, the positioning ball 1054 always keeps in contact with the outer side of the positioning cam 309. A floating sleeve 1051 is provided for sliding inside the placement cavity. A rubber sealing piece 1052 is fixedly provided at one end of the floating sleeve 1051. A first installation inner cavity 1055 is provided at the other end of the floating sleeve 1051. A thrust spring 1053 is provided in the first installation inner cavity 1055. The two ends of the force spring 1053 abut against the positioning head 105 and the floating sleeve 1051, respectively. Four first through-holes are formed at equal angles on the outer side of the positioning head 105, and four second through-holes are formed at equal angles on the outer side of the floating sleeve 1051. The end of the positioning head 105 away from the positioning ball 1054 is threadedly connected to the channel connecting sleeve 106. In the static state, the rubber sealing piece 1052 abuts against the end of the channel connecting sleeve 106 under the action of the thrust spring 1053, thereby blocking the internal channel of the channel connecting sleeve 106.

[0039] When the locking nut 306 is unlocked, the locking nut 306 is unlocked, and the locking nut 306 is unlocked, so that the locking nut 306 is unlocked.

[0040] During use after installation, when the revolving door is opened or closed, the telescopic pin 303 rotates along with the revolving door. The telescopic pin 303 transmits power through its lateral surface and the lateral surface of the spring stop protrusion 3051, driving the installation sleeve 305 to rotate. The complete gear sleeve 308 then rotates accordingly. The complete gear sleeve 308 drives the gear 310 to rotate through the gear meshing transmission, and the positioning cam 309 fixed to it rotates synchronously.

[0041] As can be seen, during the opening process of the revolving door, the positioning cam 309 rotates. When the revolving door rotates to an angle of seventy-five degrees with the door frame, the positioning ball 1054 contacts point A or point A' on the positioning cam 309. Point A or point A' is marked as the dead point. Therefore, when the revolving door is opened to seventy-five degrees, the positioning ball 1054 contacts the dead point position. The revolving door continues to open, and the positioning ball 1054 enters the concave arc surface through the dead point position. At this time, the revolving door is fully opened and is ninety degrees with the door frame. During the closing process of the revolving door, the positioning cam 309 rotates in the opposite direction, so that the positioning ball 1054 4 rolls relative to the positioning cam 309. After the positioning ball 1054 passes the dead point, the self-positioning of the revolving door in the open state is released. Under the action of the positioning spring 104, the positioning ball 1054 exerts a force on the arc-shaped side wall of the positioning cam 309, so that the positioning cam 309 continues to rotate without the help of external force. In addition, the revolving door can automatically close with the help of this force when the external force is lost. It should be noted that, regardless of whether the revolving door is opening or closing, the positioning ball 1054 always maintains contact with the positioning cam 309 under the action of the positioning spring 104.

[0042] During use, the self-positioning force can be adjusted according to the different needs of the user, specifically: by twisting the adjusting bevel gear member 107 with a wrench, the adjusting bevel gear member 107 engages with one end of the threaded rotating member 101 to drive the threaded rotating member 101 to rotate. Since the threaded rotating member 101 and the threaded adjusting sleeve 102 rotate relative to each other and the two are threadedly connected, the threaded adjusting sleeve 102 moves horizontally relative to the limit ring 103, thereby squeezing or relaxing one end of the positioning spring 104, thereby changing the elastic force of the positioning spring 104, and then changing the squeezing force of the positioning ball 1054 on the positioning groove 3091, and finally completing the adjustment of the self-positioning force. During the adjustment process, the movement of the threaded adjusting sleeve 102 will cause the total volume of the first hydraulic oil chamber and the second hydraulic oil chamber to change, while the volume of the hydraulic oil remains unchanged. The pressure generated at this time will push the sealing piston head 1024 to move and cause the discharge spring 1023 to undergo elastic deformation, thereby compensating for the volume of the first hydraulic oil chamber, avoiding the problem of being unable to adjust the self-positioning force due to the presence of hydraulic oil;

[0043] The above-mentioned revolving door is automatically closed without the aid of external force, and it is necessary to control the speed of the automatic closing of the revolving door. During the closing process of the revolving door, the contact point of the positioning ball 1054 on the positioning cam 309 is transferred from the long side of the positioning cam 309 to the short side, so that the positioning head 105 moves in the direction close to the positioning cam 309 under the action of the positioning spring 104, and the hydraulic oil in the second hydraulic oil chamber is squeezed and flows through the throttling threaded hole 316, the oil channel and the hydraulic oil flow hole 317 to the first hydraulic oil chamber. An adjusting screw is provided in the throttling threaded hole 316 to adjust the size of the damaged gap of the throttling threaded hole 316, thereby controlling the speed of the hydraulic oil transferring from the first hydraulic oil chamber to the second hydraulic oil chamber, and further controlling the self-closing speed of the revolving door, thereby improving the safety factor. Here, the adjusting screw and the throttling threaded hole 316 cooperate with each other to play the role of a throttle valve;

[0044] Due to the presence of hydraulic oil, the resistance during the opening process of the revolving door may be too large. When the revolving door is opened, the contact point of the positioning ball 1054 on the positioning cam 309 is transferred from the short side to the long side of the positioning cam 309, and the positioning head 105 squeezes the positioning spring 104 and moves away from the positioning cam 309. After the hydraulic oil in the first hydraulic oil chamber is squeezed, on the one hand, the hydraulic oil enters the second hydraulic oil chamber through the hydraulic oil circulation hole 317, the oil channel and the throttling threaded hole 316. On the other hand, under the action of pressure, the hydraulic oil pushes the floating sleeve 1051 through the internal channel of the channel connecting sleeve 106 to squeeze the thrust spring 1053, thereby releasing the blockage of the channel connecting sleeve 106 by the rubber sealing sheet 1052, forming a dual channel for the hydraulic oil to transfer from the first hydraulic oil chamber to the second hydraulic oil chamber. The existence of the dual channel greatly accelerates the flow speed of the hydraulic oil, thereby greatly reducing the resistance encountered during the opening process of the revolving door and enhancing the user experience.

[0045] It should be noted that during the closing process of the revolving door, the dual channel does not exist, the pressure of the hydraulic oil in the second hydraulic oil chamber is greater than the pressure of the hydraulic oil in the first hydraulic oil chamber, and the rubber sealing sheet 1052 tightly blocks the internal channel of the channel connecting sleeve 106 under the dual action of the thrust spring 1053 and the oil pressure. Here, the floating sleeve 1051 and the thrust spring 1053 cooperate with each other to play the role of a one-way valve.

[0046] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An upper door shaft with self-closing and self-positioning functions, comprising a positioning adjustment component (1) and a rotating working component (3) and a connecting section (2) for fixedly connecting the two, wherein the positioning adjustment component (1), the rotating working component (3) and the connecting section (2) are all provided with cavities and are interconnected to form an integral cavity, characterized in that: A self-positioning mechanism is provided in the integral cavity, the self-positioning mechanism comprising a floating positioning head (105) and a positioning cam (309) rotatably provided in the rotating working assembly (3), a plurality of positioning grooves (3091) being provided on the positioning cam (309), the positioning head (105) always being in contact with the outer side of the positioning cam (309), and a hydraulic circulation structure for controlling the self-closing speed being provided in the integral cavity; The hydraulic circulation structure comprises two hydraulic circulation channels and a first hydraulic oil chamber and a second hydraulic oil chamber separated by a positioning head (105); during operation, the first hydraulic oil chamber and the second hydraulic oil chamber are connected or closed via the two hydraulic circulation channels; A hydraulic circulation channel includes a throttling threaded hole (316), an oil passage, and a hydraulic oil circulation hole (317) provided on a rotating working housing (300) in the rotating working assembly (3). The throttling threaded hole (316) communicates with the second hydraulic oil chamber and the oil passage, and the hydraulic oil circulation hole (317) communicates with the first hydraulic oil chamber and the oil passage. When the rotating door is opened, the hydraulic oil flows from the first hydraulic oil chamber through the hydraulic oil circulation hole (317), the oil passage, and the throttling threaded hole (316) into the second hydraulic oil chamber. When the rotating door is closed, the hydraulic oil flows in the opposite direction. The other hydraulic circulation channel includes a channel connecting sleeve (106) threadedly connected to one side of the positioning head (105), a floating sleeve (1051) is slidably arranged in the positioning head (105), a rubber sealing sheet (1052) is fixedly arranged at one end of the floating sleeve (1051), and a thrust spring (1053) is arranged at the other end of the floating sleeve (1051). In a static state, the rubber sealing sheet (1052) abuts against the end of the channel connecting sleeve (106) under the action of the thrust spring (1053). When the revolving door is opened, the hydraulic oil pushes away the rubber sealing sheet (1052) that blocks the internal channel of the channel connecting sleeve (106), and the hydraulic oil enters the second hydraulic oil chamber from the first hydraulic oil chamber through the channel connecting sleeve (106). When the revolving door is closed, the rubber sealing sheet (1052) always blocks the channel connecting sleeve (106).

2. The door hinge with self-closing and self-positioning functions according to claim 1, characterized in that: When the revolving door is fully opened, the positioning ball (1054) rollingly arranged at the end of the positioning head (105) cooperates with the positioning groove (3091) on the long side of the positioning cam (309) to position the revolving door.

3. The door hinge with self-closing and self-positioning functions according to claim 1, characterized in that: A positioning spring (104) is provided on one side of the positioning head (105). During the closing process of the revolving door, the positioning ball (1054) at the end of the positioning head (105) is moved from the long side to the short side of the positioning cam (309) under the action of the positioning spring (104) to contact the positioning cam (309).

4. The door hinge with self-closing and self-positioning functions according to claim 1, characterized in that: A notch is provided in the throttling threaded hole (316), and an adjusting screw is provided in the throttling threaded hole (316) for changing the size of the notch and controlling the flow rate of the hydraulic oil.

5. The door hinge with self-closing and self-positioning functions according to claim 1, characterized in that: The positioning adjustment component (1) is provided with a threaded adjustment sleeve (102) for adjusting the elastic force of the positioning spring (104), and a sealing piston head (1024) is floatingly provided in an inner cavity at one end of the threaded adjustment sleeve (102).

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