Automatic rotating joint

Abstract

The invention relates to the technical field of crane pipe joints, in particular to an automatic rotating joint which comprises a rotating flange, a pipe flange is connected to one end of the rotating flange, a first sealing face is formed between the pipe flange and the rotating flange, a butt flange is arranged at the other end of the rotating flange, and a second sealing face is formed between the butt flange and the rotating flange. The equipment is safe and reliable. The driving motor and the pinion rotate synchronously, the pinion and the bull gear rotate in a meshed mode, and the bull gear drives the outer ring of the rotating flange to rotate relative to the inner ring; the driving motor drives the small gear and the large gear to mesh and rotate, driving force is continuous and stable, and starting and stopping are controllable. The angle sensor is stably fixed to the gear ring face of the side, away from the second sealing face, of the large gear, starting and stopping of the driving motor are detected and adjusted in real time through the angle sensor and the controller, finally the rotating angle of the rotating flange is driven, the system can accurately control the rotating angle so that the rotating flange can rotate to the preset position, operation deviation of loading cooperation cannot be caused, and the working efficiency is improved. The automation degree is high.

Description

Technical Field

[0001] The invention relates to the technical field of crane pipe joints, in particular to an automatic rotating joint. Background Art

[0002] In the petroleum, chemical, and natural gas industries, the loading and unloading of liquids and gases involves the transmission of dangerous goods, which requires precise and safe connection equipment. Pipe fittings must cope with extreme environmental conditions such as pressure, temperature fluctuations, and chemical corrosion of liquids or gases. Many fluids are volatile or flammable, requiring pipe fittings to have good sealing properties to prevent leakage and explosion during transportation.

[0003] As one of the key components in the crane pipe system, the crane pipe swivel joint is mainly used for efficient and safe transportation of liquids or gases, especially in situations where flexible connections are required. The swivel joint enables the crane pipe to rotate, retract or change direction as needed during loading and unloading, providing greater flexibility and adaptability. This type of joint is widely used in many fields such as petrochemicals, natural gas, liquefied petroleum gas (LPG), liquefied natural gas (LNG), ship refueling, port loading and unloading, etc. The swivel joint is suitable for the transportation of ordinary fluids, and can also meet the transportation needs of high temperature, high pressure and corrosive fluids.

[0004] However, in the prior art, during the transportation process, the swivel joint is manually operated to rotate, which takes up a lot of operation time. At the same time, it is difficult to accurately control the rotation angle and direction. The crane pipe often cannot be rotated to the predetermined position due to operation errors. When the swivel joint is connected to the drop pipe, the drop pipe cannot be accurately rotated to the insertion position specified by the tank truck, which inevitably causes liquid overflow and leakage due to misalignment. The safe and rapid transfer of the medium in the crane pipe cannot be guaranteed. During the medium transfer process, medium leakage caused by sealing failure is prone to occur. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an automatic rotating joint which can automatically rotate, accurately control the rotation angle, accurately position and has high sealing performance in view of the deficiencies in the prior art.

[0006] The technical problem to be solved by the present invention is achieved through the following technical scheme: an automatic rotating joint, including a rotating flange, the rotating flange including an outer ring and an inner ring that can rotate relative to each other, the outer ring is sleeved on the inner ring, one end of the rotating flange is connected to a pipe flange, a first sealing surface is formed between the pipe flange and the rotating flange, a docking flange is provided at the other end of the rotating flange, a second sealing surface is formed between the docking flange and the rotating flange, the pipe flange, the inner ring and the docking flange are coaxially connected, a rotating drive device is provided between the outer ring of the rotating flange and the docking flange, the rotating drive device includes a driving motor and a small gear and a large gear that are meshed with each other, the driving motor is fixedly connected to the outer ring of the rotating flange through a motor seat, the driving motor shaft is fixedly connected to the small gear, and the large gear is sleeved on the outer ring of the docking flange; the first sealing surface and the second sealing surface effectively prevent medium leakage, and the equipment is safe and reliable.

[0007] The driving motor rotates synchronously with the pinion gear, the pinion gear meshes and rotates with the large gear, and the large gear drives the outer ring of the rotating flange to rotate relative to the inner ring; the driving motor drives the pinion gear to mesh and rotate with the large gear, the driving force is continuous and stable, and the start and stop are controllable.

[0008] An angle sensor is provided on the gear ring surface on the side of the large gear away from the second sealing surface. A controller is provided on the angle sensor. The angle sensor rotates synchronously with the large gear. The angle sensor detects the angle displacement in real time and transmits it to the controller. The controller is connected to the drive motor for communication. The controller controls the start and stop of the drive motor to realize the rotation of the docking flange relative to the pipe flange. The angle sensor and the controller detect and adjust the start and stop of the drive motor in real time, and finally drive the rotation angle of the rotating flange. The system can accurately control the rotation angle to rotate to the preset position, which will not cause operational deviation in loading coordination and has a high degree of automation.

[0009] As a further solution of the present invention, the large gear includes a first clamping ring and a second clamping ring divided into two semicircles, the ring bodies of the first clamping ring and the second clamping ring include an inner ring and an outer ring, radially arranged reinforcing ribs are arranged between the inner ring and the outer ring, bolt holes are correspondingly arranged on the reinforcing ribs where the first clamping ring and the second clamping ring are connected to each other, bolts are arranged in the bolt holes for fastening, a connecting ring surface is arranged on one side surface of the inner ring to match with the docking flange, bolt holes are arranged on the connecting ring surface to match with the bolt holes on the inner ring of the docking flange, the back of the docking flange is connected to the convex surface of the connecting ring surface, and connected by bolts. The first clamping ring and the second clamping ring are connected by bolts, and are clamped on the outside of the docking flange, which is convenient for installation and disassembly, reducing maintenance time and cost; the connecting ring surface is closely matched with the docking flange to limit the axial displacement of the docking flange; and the radially arranged reinforcing ribs improve the strength and deformation resistance of the overall structure, so that the gear is evenly stressed and overload and material fatigue are avoided.

[0010] As a further solution of the present invention, a clamping base for fixing the angle sensor is provided on the gear ring surface of the large gear, the clamping base includes a positioning groove, two clamping plates arranged opposite to each other are provided in the positioning groove, and a clamping spring is provided between each clamping plate and the positioning groove;

[0011] The angle sensor is provided with a base at the bottom, and a circle of locking ridges is provided on the base. The base is clamped between two clamping plates, and the locking ridges and the bottom surface of the stiffening plate are self-locking. The angle sensor is firmly fixed on the large gear through the clamping base. During operation, there will be no relative displacement, and the angle measurement is accurate.

[0012] As a further solution of the present invention, the pinion is sleeved on the drive motor shaft, the drive motor shaft is provided with a flat key, the pinion includes a central axial hole, a keyway is provided in the axial hole, and the flat key cooperates with the keyway. The pinion cooperates with the drive motor shaft through the keyway, so that the pinion and the drive motor shaft rotate synchronously without slipping or speed difference.

[0013] As a further solution of the present invention, the large gear and the small gear are wrapped with an outer cover, holes are opened on both sides of the outer cover, the diameter of the outer cover hole is consistent with the diameter of the inner ring, and the lateral width of the outer cover is greater than the overlapping width of the docking flange, the large gear and the angle sensor. The outer cover provides a physical barrier to prevent external substances such as dust, dirt, metal chips, etc. from entering the gear system, reducing damage and failures caused by pollution. In particular, the protection of the angle sensor to prevent the angle sensor from being directly exposed to harsh environments helps to improve measurement accuracy and reliability.

[0014] As a further solution of the present invention, the motor seat includes a bracket and an annular base, the annular base is provided with a base hole, the outer wall of the outer ring is provided with a positioning hole corresponding to the base hole, and the base hole and the positioning hole are fastened by screws. The accurate docking of the motor seat and the bracket avoids deviation or looseness during installation or use. The installation accuracy of the motor assembly is improved, and the stability and reliability of the motor operation are improved.

[0015] As a further solution of the present invention, a raceway is coupled between the outer wall of the inner ring of the rotating flange and the inner wall of the outer ring, a plurality of rolling bodies are arranged in the raceway, a sealing groove is arranged on the outer wall of the inner ring, a sealing ring is arranged in the sealing groove, and an injection hole connected to the raceway is arranged along the radial direction of the outer ring, and a screw plug is matched on the injection hole. The raceway, rolling bodies and injection holes are matched between the inner ring and the outer ring, which greatly reduces friction and wear, effectively dissipates heat during the relative sliding process, and prolongs the service life of the rotating flange.

[0016] As a further solution of the present invention, the raceways are two and are arranged parallel to each other along the circumferential direction, the raceways include an upper groove provided on the inner wall of the outer ring and a lower groove provided on the outer wall of the inner ring, the rolling body is arranged between the upper groove and the lower groove, the rolling body is a steel ball, the injection holes are arranged one by one with the raceways, and the two injection holes are located in the same position of the outer ring. The steel ball has high hardness and strength, bears a large load during the rolling process and effectively shares the external pressure, and slides smoothly and stably.

[0017] As a further solution of the present invention, the second sealing surface is provided with a sealing groove, a nitrogen sealing ring is provided in the sealing groove, nitrogen is filled in the sealing groove, the nitrogen pressure is greater than the medium pressure passing through the rotary joint, and the nitrogen sealing ring is in close contact with the sealing groove for dynamic sealing. As an inert gas, nitrogen is not easy to react with other substances, effectively preventing leakage of the medium during the rotary motion, and ensuring the sealing performance during the dynamic sealing process.

[0018] The beneficial effects of the present invention are:

[0019] An automatic rotating joint provided by the present invention comprises a rotating flange, which comprises an outer ring and an inner ring that can rotate relative to each other, the outer ring is sleeved on the inner ring, one end of the rotating flange is connected to a pipe flange, a first sealing surface is formed between the pipe flange and the rotating flange, and a docking flange is provided at the other end of the rotating flange, a second sealing surface is formed between the docking flange and the rotating flange, the first sealing surface and the second sealing surface effectively prevent leakage of the medium, and the equipment is safe and reliable.

[0020] The driving motor rotates synchronously with the pinion gear, the pinion gear meshes and rotates with the large gear, and the large gear drives the outer ring of the rotating flange to rotate relative to the inner ring; the driving motor drives the pinion gear to mesh and rotate with the large gear, the driving force is continuous and stable, and the start and stop are controllable.

[0021] The angle sensor is firmly fixed on the gear ring surface on the side of the large gear away from the second sealing surface. The angle sensor and controller detect and adjust the start and stop of the drive motor in real time, and finally drive the rotation angle of the rotating flange. The system can accurately control the rotation angle to rotate to the preset position without causing operational deviation in loading and unloading, and has a high degree of automation.

[0022] The first retaining ring and the second retaining ring of the large gear are connected by bolts and clamped on the outside of the docking flange, which is convenient for installation and disassembly, reducing maintenance time and cost; the connecting ring surface is closely matched with the docking flange to limit the axial displacement of the docking flange; and the radially arranged reinforcing ribs improve the strength and deformation resistance of the overall structure, so that the gears are evenly stressed and avoid overload and material fatigue.

[0023] The outer cover of the large gear and small gear provides a physical barrier to prevent foreign substances such as dust, dirt, metal chips, etc. from entering the gear system, reducing damage and failures caused by contamination. In particular, the protection of the angle sensor to prevent the angle sensor from being directly exposed to harsh environments helps improve measurement accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall front view of the present invention;

[0025] Figure 2 It is an overall assembly view of the present invention;

[0026] Figure 3 A bottom view of the present invention;

[0027] Figure 4 A top view of the present invention;

[0028] Figure 5 It is a schematic diagram of the AA direction of the present invention;

[0029] Figure 6 This is a schematic diagram of the installation of the angle sensor of the present invention;

[0030] Figure 7 It is a schematic diagram of the large gear structure of the present invention.

[0031] Wherein: 1-rotation drive device, 101-drive motor, 102-motor seat, 103-small gear, 104-large gear, 141-first retaining ring, 142-second retaining ring, 143-reinforcement rib, 144-connecting ring surface, 145-bolt, 2-angle sensor, 201-controller, 202-card holder, 221-locking convex ridge, 203-clamping base, 232-clamping spring, 231-clamping plate, 233-positioning groove, 3-jointing flange, 4-second sealing surface, 5-rotating flange, 501-outer ring, 502-inner ring, 503-raceway, 531-rolling element, 504-sealing groove, 505-injection hole, 506-screw plug, 6-pipe flange, 7-first sealing surface, 8-outer cover. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] like Figure 1-Figure 7 As shown, an automatic rotary joint includes a rotary flange 5, which includes an outer ring 501 and an inner ring 502 that can rotate relatively, the outer ring is sleeved on the inner ring, a raceway 503 is coupled between the outer wall of the inner ring of the rotary flange and the inner wall of the outer ring, a plurality of rolling bodies 531 are arranged in the raceway, a sealing groove 504 is arranged on the outer wall of the inner ring, a sealing ring is arranged in the sealing groove, an injection hole 505 connected to the raceway is arranged in the radial direction of the outer ring, and a screw plug 506 is matched on the injection hole. The two screw plugs on the outer ring are screwed open respectively, and steel balls are placed in the two raceways from the injection holes respectively, and finally the injection holes are covered with the screw plugs.

[0036] The raceways 503 are two and are arranged parallel to each other along the circumferential direction. The raceways include an upper groove provided on the inner wall of the outer ring and a lower groove provided on the outer wall of the inner ring. The rolling body is arranged between the upper groove and the lower groove. The rolling body is a steel ball. The injection holes are arranged one-to-one with the raceways, and the two injection holes are located in the same position of the outer ring. When the outer ring rotates along the circumference of the inner ring, a string of steel balls moves in the raceway, converting the rotational friction of the outer ring along the inner ring into rolling friction. The outer ring rotates more smoothly, ensuring uniform rotational motion.

[0037] One end of the rotating flange 5 is connected to the pipe flange 6, and a first sealing surface 7 is formed between the pipe flange and the rotating flange. The other end of the rotating flange is provided with a docking flange 3, and a second sealing surface 4 is formed between the docking flange and the rotating flange. The second sealing surface is provided with a sealing groove, and a nitrogen sealing ring is provided in the sealing groove. Nitrogen is filled in the sealing groove, and the nitrogen pressure is greater than the medium pressure passing through the rotating joint. The nitrogen sealing ring is in close contact with the sealing groove for dynamic sealing. The first sealing surface and the second sealing surface seal the gap between the inner ring and the outer ring to prevent the leakage of the medium due to the failure of the main sealing surface to prevent dust.

[0038] The pipe flange 6, the inner ring 502 and the docking flange 3 are coaxially connected. A rotating drive device 1 is provided between the outer ring of the rotating flange and the docking flange. The rotating drive device includes a driving motor 101 and a small gear 103 and a large gear 104 that are meshed with each other.

[0039] The driving motor 101 is fixedly connected to the outer ring of the rotating flange through the motor base 102. The motor base 102 includes a bracket and an annular base. The annular base is provided with a base hole, and the outer wall of the outer ring is provided with a positioning hole corresponding to the base hole. The base hole and the positioning hole are fastened together by screws.

[0040] The drive motor shaft is fixedly connected to the pinion 103, which is sleeved on the drive motor shaft. The drive motor shaft is provided with a flat key. The pinion 103 includes a central axial hole, in which a keyway is provided, and the flat key cooperates with the keyway.

[0041] The large gear 104 is sleeved on the outer ring 501 of the docking flange; the driving motor rotates synchronously with the pinion, the pinion rotates in meshing with the large gear, and the large gear drives the outer ring of the rotating flange to rotate relative to the inner ring; the large gear includes a first clamping ring 141 and a second clamping ring 142 which are divided into two semicircles, the ring bodies of the first clamping ring and the second clamping ring include an inner ring and an outer ring, radially arranged reinforcing ribs 143 are arranged between the inner ring and the outer ring, bolt holes are correspondingly arranged on the reinforcing ribs where the first clamping ring and the second clamping ring are docked with each other, bolts 145 are fastened in the bolt holes, a connecting ring surface 144 matching with the docking flange is provided on one side surface of the inner ring, bolt holes corresponding to the bolt holes on the inner ring of the docking flange are provided on the connecting ring surface, the back of the docking flange is docked with the convex surface of the connecting ring surface, and are connected by bolts.

[0042] The driving motor 101 rotates forward, driving the small gear to rotate synchronously, the small gear 103 rotates to drive the large gear 104 to rotate, and finally the docking flange drives the inner ring 502 to rotate forward synchronously. The driving motor 101 rotates reversely, driving the small gear to rotate synchronously, the small gear 103 rotates to drive the large gear 104 to rotate, and finally the docking flange drives the inner ring to rotate in the opposite direction synchronously.

[0043] An angle sensor 2 is provided on the gear ring surface on the side of the large gear away from the second sealing surface 4. A clamping base 203 for fixing the angle sensor is provided on the gear ring surface of the large gear. The clamping base includes a positioning groove 233. Two clamping plates 231 are arranged opposite to each other in the positioning groove. A clamping spring 232 is arranged between each clamping plate and the positioning groove. A clamping seat 202 is provided at the bottom of the angle sensor. A circle of locking ridges 221 is provided on the clamping seat. The clamping seat is clamped between the two clamping plates, and the locking ridges are self-locking with the bottom surface of the stiffening plate.

[0044] The card seat extends into the clamping base, and the top and bottom of the clamping plate are provided with wedge-shaped inverted slopes. When sliding along the wedge-shaped inverted slope toward the clamping plate, the spring is in a compressed state. When the card seat slides down to the bottom of the clamping plate, the locking ridge and the bottom edge of the clamping plate are self-locking. When the card seat is removed, the angle sensor is pressed down together with the card seat to form a buffer force, the locking ridge is separated from the clamping plate, and the angle sensor is separated from the large gear.

[0045] The angle sensor 2 is provided with a controller 201, which rotates synchronously with the large gear. The angle sensor detects the angle displacement in real time and transmits it to the controller 201. The controller is connected to the drive motor 101 for communication. The controller controls the start and stop of the drive motor to realize the rotation of the docking flange relative to the pipe flange.

[0046] When the docking flange 3 rotates synchronously with the large gear, the angle sensor 2 senses the rotation angle of the large gear and the docking flange in real time, and transmits the angle position signal to the controller. When the rotation angle reaches the preset position, the controller transmits the stop signal to the drive motor, the drive motor stops, and the docking flange and the relative pipe flange rotate to the set position. When the relative rotation angle of the docking flange and the pipe flange needs to be further adjusted on site, the controller controls the drive motor to start again, driving the docking flange to rotate forward or reverse to reach the new set position.

[0047] The large gear 104 and the small gear 103 are wrapped with an outer cover 8, with holes on both sides of the outer cover, the diameter of the outer cover hole is consistent with the diameter of the inner ring, and the lateral width of the outer cover is greater than the overlapping width of the docking flange, the large gear and the angle sensor. The outer cover protects the large gear, the small gear and the angle sensor, and the entire rotation action is isolated from the external environment, realizing a stable automatic rotation environment.

[0048] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An automatic rotary joint, characterized in that: The invention comprises a rotating flange (5), wherein the rotating flange comprises an outer ring (501) and an inner ring (502) which can rotate relative to each other, wherein the outer ring is sleeved on the inner ring, wherein one end of the rotating flange is connected to a pipe flange (6), wherein a first sealing surface (7) is formed between the pipe flange and the rotating flange, wherein a docking flange (3) is provided at the other end of the rotating flange, wherein a second sealing surface (4) is formed between the docking flange and the rotating flange, wherein the pipe flange, the inner ring and the docking flange are coaxially connected, wherein a rotating driving device (1) is provided between the outer ring of the rotating flange and the docking flange, wherein the rotating driving device comprises a driving motor (101) and a small gear (103) and a large gear (104) which are meshed with each other, wherein the driving motor is fixedly connected to the outer ring of the rotating flange via a motor seat, wherein the driving motor shaft is fixedly connected to the small gear, and wherein the large gear is sleeved on the outer ring of the docking flange; The driving motor rotates synchronously with the pinion gear, the pinion gear (103) meshes with the large gear (104) and rotates, and the large gear drives the outer ring (501) of the rotating flange to rotate relative to the inner ring (502); An angle sensor (2) is provided on the gear ring surface on the side of the large gear away from the second sealing surface. A controller (201) is provided on the angle sensor. The angle sensor rotates synchronously with the large gear. The angle sensor detects the angle displacement in real time and transmits it to the controller. The controller is connected to the drive motor for communication. The controller controls the start and stop of the drive motor to realize the rotation of the docking flange relative to the pipe flange.

2. The automatic rotating joint according to claim 1, characterized in that: The large gear (104) comprises a first clamping ring (141) and a second clamping ring (142) which are divided into two semicircles. The ring bodies of the first clamping ring and the second clamping ring comprise an inner ring and an outer ring. Radial reinforcing ribs (143) are arranged between the inner ring and the outer ring. Bolt holes are correspondingly arranged on the reinforcing ribs where the first clamping ring and the second clamping ring are connected to each other. Bolts (145) are arranged in the bolt holes for fastening. A connecting ring surface (144) which matches with a connecting flange is arranged on one side surface of the inner ring. Bolt holes which match with the bolt holes on the inner ring of the connecting flange are arranged on the connecting ring surface. The back side of the connecting flange is connected to the protruding surface of the connecting ring surface and are connected by bolts.

3. The automatic rotating joint according to claim 2, characterized in that: A clamping base (203) for fixing the angle sensor is provided on the gear ring surface of the large gear (104), the clamping base comprises a positioning groove (233), two clamping plates (231) arranged opposite to each other are provided in the positioning groove, and a clamping spring (232) is provided between each clamping plate and the positioning groove; A clamping seat (202) is provided at the bottom of the angle sensor, and a circle of locking convex ridges (221) is provided on the clamping seat. The clamping seat is clamped between two clamping plates, and the locking convex ridges are clamped with the bottom surface of the stiffening plate for self-locking.

4. The automatic rotating joint according to claim 2, characterized in that: The pinion (103) is sleeved on the drive motor shaft, a flat key is provided on the drive motor shaft, the pinion comprises a central axial hole, a keyway is provided in the axial hole, and the flat key cooperates with the keyway.

5. The automatic rotating joint according to claim 4, characterized in that: The large gear (104) and the small gear (103) are wrapped with an outer cover (8) on the outside. The outer cover has holes on both sides. The diameter of the outer cover hole is consistent with the diameter of the inner ring. The transverse width of the outer cover is greater than the overlapping width of the docking flange, the large gear and the angle sensor.

6. The automatic rotating joint according to claim 5, characterized in that: The motor base (102) comprises a bracket and an annular base, the annular base is provided with a base hole, the outer wall of the outer ring is provided with a positioning hole corresponding to the base hole, and the base hole and the positioning hole are fastened and matched by screws.

7. The automatic rotating joint according to claim 1, characterized in that: A raceway (503) is coupled between the outer wall of the inner ring of the rotating flange and the inner wall of the outer ring, a plurality of rolling bodies (531) are arranged in the raceway, a sealing groove (504) is arranged on the outer wall of the inner ring, a sealing ring is arranged in the sealing groove, an injection hole (505) connected with the raceway is arranged along the radial direction of the outer ring, and a screw plug (506) is matched on the injection hole.

8. The automatic rotating joint according to claim 7, characterized in that: There are two raceways which are arranged parallel to each other along the circumferential direction. The raceways include an upper groove provided on the inner wall of the outer ring and a lower groove provided on the outer wall of the inner ring. The rolling body is arranged between the upper groove and the lower groove. The rolling body (531) is a steel ball. The injection holes are arranged one by one with the raceways, and the two injection holes are located at the same position of the outer ring.

9. The automatic rotating joint according to claim 6, characterized in that: The second sealing surface (4) is provided with a sealing groove, in which a nitrogen sealing ring is provided. The sealing groove is filled with nitrogen, the nitrogen pressure is greater than the pressure of the medium passing through the rotary joint, and the nitrogen sealing ring is in close contact with the sealing groove for dynamic sealing.

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