Fluid handling arm automatic swivel joint device

Abstract

The utility model relates to the technical field of fluid loading and unloading equipment discloses fluid loading and unloading arm automatic rotating joint device, including the rotating joint flange cover, rotating outer joint, connecting seat, worm shaft, drive mechanism for the pipeline welding connection with the swab, the rotating outer joint is equipped with worm wheel, the outer wall of rotating outer joint is provided with the connecting ring of worm wheel placement, worm wheel is connected with the connecting ring through bolt, drive mechanism passes through worm shaft and worm wheel transmission connection, rotating outer joint is equipped in double raceway inner pipe, the bottom welding of double raceway inner pipe has the upper neck butt joint flange, the bottom of upper neck butt joint flan is connected with lower neck butt joint flange through bolt, the whole structure is connected with the welding combination mode through bolt, and the connecting strength and assembly flexibility are taken into account, and the high pressure, vibration working condition of adapting fluid loading and unloading scene is promoted, and the whole stability of device is improved, the problem that rotating joint exists transmission precision low, torque deficiency, rotation is not smooth is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of fluid loading and unloading equipment, and more specifically, to an automatic rotary joint device for fluid loading and unloading arms. Background Technology

[0002] In fluid loading and unloading operations, the rotary joint is the core component of the fluid loading and unloading arm, used to realize the relative rotation between the pipeline and the loading and unloading equipment, ensuring the continuity of fluid transportation.

[0003] Existing fluid loading and unloading arm rotary joints have many shortcomings: First, the transmission structure design is unreasonable, and most of them use direct gear transmission or manual drive, which has problems such as low transmission accuracy, insufficient torque, and uneven rotation, making it difficult to adapt to the needs of automated loading and unloading operations; Second, the connection structure has poor stability, and the positioning accuracy between pipes and joints, and between various components of joints is low. Long-term use can easily lead to loosening and deformation, affecting the service life of the equipment. Utility Model Content

[0004] The purpose of this invention is to provide an automatic rotary joint device for fluid loading and unloading arms, which aims to solve the problems of low transmission accuracy, insufficient torque, and uneven rotation of rotary joints in the prior art.

[0005] This utility model is an automatic rotary joint device for fluid loading and unloading arms, comprising a rotary joint flange cover for pipe welding connection with the loading arm, a rotary outer joint, a connecting seat, a worm shaft, and a drive mechanism. The rotary joint flange cover is bolted to the top of the rotary outer joint. A worm wheel is sleeved on the rotary outer joint. A connecting ring for placing the worm wheel is protruding on the outer wall of the rotary outer joint. The worm wheel and the connecting ring are bolted together. The drive mechanism and the worm shaft are respectively mounted on the connecting seat. The drive mechanism is connected to the worm wheel through the worm shaft. The rotary outer joint is sleeved on the double-race inner tube. The top of the double-race inner tube is connected to the rotary joint flange cover. The bottom of the double-race inner tube is welded with an upper necked welding flange. The upper necked welding flange is connected to the connecting seat by bolts. The bottom of the upper necked welding flange is connected to a lower necked welding flange by bolts.

[0006] Furthermore, the drive mechanism includes an explosion-proof servo motor and a planetary reducer. The explosion-proof servo motor is connected to the planetary reducer, and the planetary reducer is connected to the worm gear drive via a worm shaft.

[0007] Furthermore, the connecting seat includes a bearing mounting plate and a support. The bearing mounting plate is provided with two symmetrically arranged bearing seats, which are connected by a worm gear shaft. One end of the support is bolted to a bearing seat, and the other end of the support is connected to the planetary reducer.

[0008] Furthermore, the bearing mounting plate has a semi-circular notch, and the bearing mounting plate is connected to the upper and lower necked welding flanges by multiple bolts along the edge of the semi-circular notch. The inner wall of the semi-circular notch is spaced apart from the upper part of the upper necked welding flange.

[0009] Furthermore, the outer wall of the double raceway inner tube has two inwardly recessed inner raceway grooves, which are arranged alternately along the axial direction of the double raceway inner tube. The inner wall of the rotary outer joint has an outer raceway groove corresponding to the inner raceway grooves, and the outer raceway groove of the rotary outer joint is rotatably engaged with the inner raceway groove through rolling balls.

[0010] Furthermore, two sealing grooves are formed inwardly recessed on the outer wall of the double raceway inner tube, and a secondary sealing ring is provided in the sealing groove. The secondary sealing ring is located between the rotary outer joint and the double raceway inner tube. A rolling area is formed between the two sealing grooves, and the two inner raceway grooves are located in the rolling area.

[0011] Furthermore, the rotary joint flange cover has an internal cavity that extends vertically. The bottom of the rotary joint flange cover is recessed to form an annular stepped groove, which is located at the bottom of the internal cavity. The top of the double-race inner tube is located in the annular stepped groove, and a main sealing ring is provided at the top of the double-race inner tube. The double-race inner tube abuts against the top of the annular stepped groove through the main sealing ring. The inner wall of the main sealing ring is recessed inward to form a deformation groove, which is arranged around the circumference of the main sealing ring.

[0012] Furthermore, the top of the rotary joint flange cover is provided with an upward-protruding abutment ring step for connecting the bottom of the pipe. The abutment ring step is arranged in an inclined manner. The top of the abutment ring step is provided with an upward-protruding limiting ring for insertion into the pipe. The inner wall of the limiting ring is provided with a plurality of vertically arranged reinforcing plates. The reinforcing plates are vertically fixed on the inner wall of the limiting ring. The plurality of reinforcing plates are arranged at intervals around the inner circumference of the limiting ring. The end of the reinforcing plate facing the center of the inner cavity is arranged in an arc shape. The upper part of the reinforcing plate is exposed above the limiting ring, forming a limiting plate. The lower part of the reinforcing plate extends to the bottom of the internal cavity and is exposed on the inner side of the annular stepped groove, forming a stop plate.

[0013] Furthermore, a transition area is formed between adjacent limiting plates, and a sidewall sealing plate is provided in the transition area. Adjacent limiting plates are connected by the sidewall sealing plate. The bottom of the sidewall sealing plate extends downward toward the transition area. The tops of multiple sidewall sealing plates are connected by a transition strip. The transition strip and the sidewall sealing plate are integrally formed.

[0014] Furthermore, the bottom of the transition strip is engaged with the top of the limiting plate, and the top of the transition strip is arranged in an arc shape.

[0015] Compared with existing technologies, the automatic rotary joint device for fluid loading and unloading arms provided by this utility model has a rotary joint flange cover welded to the loading arm pipe, which is then bolted to the rotary outer joint. This ensures both a strong connection and ease of assembly and disassembly, while also achieving a sealed connection between the pipe and the rotating component. The worm gear is fixed to the connecting ring bolt of the rotary outer joint, and the drive mechanism drives the worm gear to rotate through the worm shaft. The transmission structure is compact and the power transmission is precise, enabling stable automatic rotation of the rotary outer joint and meeting the angle adjustment requirements of the fluid loading and unloading arm. The double-race inner tube is fixed to the connecting seat through upper and lower necked butt-welded flanges, forming a stable fixed support structure. This, combined with the sleeved arrangement of the rotary outer joint, ensures reliable isolation between the rotating and fixed components, guaranteeing independent and smooth rotation. The overall structure combines bolted and welded connections, balancing connection strength and assembly flexibility, adapting to high-pressure and vibration conditions in fluid loading and unloading scenarios, and improving the overall stability of the device. This solves the problems of low transmission accuracy, insufficient torque, and uneven rotation inherent in rotary joints. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the automatic rotary joint device for fluid loading and unloading arm provided by this utility model; Figure 2 This is a cross-sectional perspective view of the automatic rotary joint device for fluid loading and unloading arm provided by this utility model; Figure 3 This is an exploded perspective view of the automatic rotary joint device for fluid loading and unloading arm provided by this utility model; Figure 4 This is a cross-sectional structural diagram of the connection between the rotary joint flange cover and the pipeline provided by this utility model; Figure 5 This is a top view of the rotary joint flange cover provided by this utility model.

[0017] In the diagram: 10 rotary joint flange cover, 20 rotary external joint, 30 connecting seat, 40 worm shaft, 50 worm wheel, 60 drive mechanism, 70 double raceway inner tube, 80 upper necked welding flange, 90 lower necked welding flange, 11 pipe, 12 annular stepped groove, 13 abutment ring step, 14 limiting ring, 15 reinforcing plate, 16 limiting plate, 17 stop plate, 18 side wall sealing plate, 19 transition strip, 21 connecting ring, 31 bearing mounting plate, 32 support, 33 bearing seat, 34 semi-circular notch, 61 explosion-proof servo motor, 62 planetary reducer, 71 rolling ball, 72 secondary sealing ring, 73 main sealing ring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0020] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] Reference Figure 1-5 The image shown is a preferred embodiment of the present invention.

[0022] The automatic rotary joint device for fluid loading and unloading arm includes a rotary joint flange cover 10, a rotary outer joint 20, a connecting seat 30, a worm shaft 40, and a drive mechanism 60 for welding connection with the pipe 11 of the loading arm. The rotary joint flange cover 10 is bolted to the top of the rotary outer joint 20. A worm wheel 50 is sleeved on the rotary outer joint 20. A connecting ring 21 for placing the worm wheel 50 is protruding on the outer wall of the rotary outer joint 20. The worm wheel 50 and the connecting ring 21 are bolted together. The drive mechanism 60 and the worm shaft 40 are respectively mounted on the connecting seat 30. The drive mechanism 60 is connected to the worm wheel 50 through the worm shaft 40. The rotary external joint 20 is fitted onto the double raceway inner tube 70. The top of the double raceway inner tube 70 is connected to the rotary joint flange cover 10. The bottom of the double raceway inner tube 70 is welded with an upper necked welding flange 80. The upper necked welding flange 80 is connected to the connecting seat 30 by bolts. The bottom of the upper necked welding flange 80 is connected to a lower necked welding flange 90 by bolts.

[0023] The aforementioned automatic rotary joint device for fluid loading and unloading arms features a rotary joint flange cover 10 welded to the loading arm pipe 11, which is then bolted to the rotary outer joint 20. This ensures a secure connection while facilitating assembly and disassembly, and simultaneously achieves a sealed connection between the pipe 11 and the rotating component. The worm gear 50 is bolted to the connecting ring 21 of the rotary outer joint 20. The drive mechanism 60 drives the worm gear 50 to rotate via the worm shaft 40. This compact transmission structure ensures precise power transmission, enabling stable automatic rotation of the rotary outer joint 20 and meeting the angle adjustment requirements of the fluid loading and unloading arm. The double-race inner tube 70 is fixed to the connecting seat 30 via upper and lower necked butt-welded flanges 90, forming a stable fixed support structure. This structure, in conjunction with the rotary outer joint 20, ensures reliable isolation between the rotating and fixed components, guaranteeing independent and smooth rotation. The overall structure, combining bolted and welded connections, balances connection strength and assembly flexibility, adapting to high-pressure and vibration conditions in fluid loading and unloading scenarios and improving the overall stability of the device. This solves the problems of low transmission accuracy, insufficient torque, and uneven rotation inherent in rotary joints.

[0024] In this embodiment, the drive mechanism 60 includes an explosion-proof servo motor 61 and a planetary reducer 62. The explosion-proof servo motor 61 is connected to the planetary reducer 62, and the planetary reducer 62 is connected to the worm wheel 50 through the worm shaft 40.

[0025] The explosion-proof servo motor 61, in conjunction with the planetary reducer 62, can precisely control the rotation speed and rotation angle, enabling fine-tuning of the rotational motion and adapting to the position alignment requirements of different loading and unloading conditions. The planetary reducer 62 can amplify the output torque and reduce the output speed, ensuring sufficient power and smooth operation of the worm gear 50 worm drive, avoiding rotational jamming due to excessive load, and improving the reliability of the device operation.

[0026] In this embodiment, the connecting seat 30 includes a bearing mounting plate 31 and a support 32. The bearing mounting plate 31 is provided with two symmetrically arranged bearing seats 33, which are connected by a worm shaft 40. One end of the support 32 is bolted to a bearing seat 33, and the other end of the support 32 is connected to the planetary reducer 62.

[0027] Two symmetrical bearing seats 33 provide stable rotational support for the worm shaft 40, reducing radial runout during rotation, ensuring the accuracy of worm gear 50 meshing with the worm, and reducing transmission wear. The support 32 connects the bearing seats 33 and the planetary reducer 62 with bolts to form an integrated drive mounting structure, making the connection between the drive mechanism 60 and the worm shaft 40 more secure, the force transmission more balanced, and preventing structural loosening during operation. The overall connecting seat 30 has a compact structure and rationally allocates the installation space between the drive mechanism 60 and the transmission components, thereby improving the overall structural integrity of the device and extending the service life of the transmission system.

[0028] In this embodiment, a semi-circular notch 34 is provided on the bearing mounting plate 31. The bearing mounting plate 31 is connected to the upper neck welding flange 80 and the lower neck welding flange 90 by multiple bolts along the edge of the semi-circular notch 34. The inner wall of the semi-circular notch 34 is spaced apart from the upper part of the upper neck welding flange 80.

[0029] The semi-circular notch 34 of the bearing mounting plate 31 allows for direct side-mounted installation with the upper and lower necked welding flanges 90, greatly simplifying the assembly and maintenance process and improving maintenance efficiency; it also prevents interference between the bearing mounting plate 31 and rotating components, ensuring smooth rotation of the rotating external joint 20 and the worm gear 50, and eliminating potential mechanical friction hazards.

[0030] Multiple bolts are distributed and connected along the edge of the semi-circular notch 34, so that the connection between the bearing mounting plate 31 and the flange is evenly stressed, the fixation is more secure, and the connection stability between the connecting seat 30 and the fixed component is enhanced.

[0031] In this embodiment, two inner raceway grooves are formed inwardly recessed on the outer wall of the double raceway inner tube 70. The two inner raceway grooves are arranged sequentially at intervals along the axial direction of the double raceway inner tube 70. An outer raceway groove corresponding to the inner raceway groove is formed in the inner wall of the rotary outer connector 20. The outer raceway groove of the rotary outer connector 20 is rotatably engaged with the inner raceway groove through the rolling ball 71.

[0032] The two inner raceway grooves of the double raceway inner tube 70 cooperate with the outer raceway groove of the rotary outer joint 20 to achieve rolling friction transmission through the rolling balls 71. Compared with sliding friction, this greatly reduces rotational resistance, makes the rotational action smoother, and reduces energy loss.

[0033] The double raceway structure increases the rolling contact area, enhances the radial load-bearing capacity of the device, can withstand pressure shocks and vibrations during fluid loading and unloading, prevents rotating parts from shifting, and ensures operational stability.

[0034] In this embodiment, two sealing grooves are formed inwardly recessed on the outer wall of the double raceway inner tube 70. A secondary sealing ring 72 is provided in the sealing groove and is located between the rotary outer joint 20 and the double raceway inner tube 70. A rolling area is formed between the two sealing grooves, and the two inner raceway grooves are located in the rolling area.

[0035] A secondary sealing ring 72 is installed in the sealing groove of the double raceway inner tube 70 to achieve dynamic sealing between the rotary outer joint 20 and the double raceway inner tube 70, effectively preventing fluid leakage, improving the sealing reliability of the device, and protecting the surrounding environment and equipment.

[0036] Two sealing grooves are located on both sides of the rolling area, forming a sealed protection for the rolling ball 71, preventing fluid from entering the rolling area and causing the rolling ball 71 to rust or get stuck, thus extending the service life of the rolling structure.

[0037] In this embodiment, the rotary joint flange cover 10 has an internal cavity that extends vertically. The bottom of the rotary joint flange cover 10 is recessed to form an annular stepped groove 12, which is located at the bottom of the internal cavity. The top of the double raceway inner tube 70 is located in the annular stepped groove 12. The top of the double raceway inner tube 70 is provided with a main sealing ring 73. The double raceway inner tube 70 abuts against the top of the annular stepped groove 12 through the main sealing ring 73. The inner sidewall of the main sealing ring 73 is recessed inward to form a deformation groove, which is arranged around the circumference of the main sealing ring 73.

[0038] The annular stepped groove 12 of the rotary joint flange cover 10 provides precise positioning for the top of the double-race inner tube 70, making the connection between the inner tube and the flange cover more closely fit, laying a good foundation for the sealing structure; the main sealing ring 73 abuts against the top of the annular stepped groove 12 to achieve static sealing between the double-race inner tube 70 and the rotary joint flange cover 10. With the deformation groove design, the main sealing ring 73 can undergo moderate deformation under fluid pressure to fill the sealing gap, improve the sealing effect, and adapt to the sealing requirements of different pressure conditions.

[0039] The circumferential deformation groove design of the main sealing ring 73 ensures that the sealing ring is subjected to uniform force, avoids local compression damage, extends the service life of the seal, and reduces the frequency of seal maintenance.

[0040] In this embodiment, the top of the rotary joint flange cover 10 is provided with an upward-protruding abutment ring step 13 for connecting the bottom of the pipe 11. The abutment ring step 13 is arranged in an inclined manner. The top of the abutment ring step 13 is provided with an upward-protruding limiting ring 14 for inserting into the pipe 11. The inner wall of the limiting ring 14 is provided with a plurality of vertically arranged reinforcing plates 15. The reinforcing plates 15 are vertically fixed on the inner wall of the limiting ring 14. The plurality of reinforcing plates 15 are arranged at intervals around the inner circumference of the limiting ring 14. The end of the reinforcing plate 15 facing the middle of the inner cavity is arranged in an arc shape. The upper part of the reinforcing plate 15 is exposed above the limiting ring 14, forming a limiting plate 16. The lower part of the reinforcing plate 15 extends to the bottom of the internal cavity and is exposed on the inner side of the annular stepped groove 12, forming a stop plate 17.

[0041] The inclined abutment ring step 13 provides a welding positioning reference for the loading arm pipe 11, making the welding of pipe 11 and flange cover more precise and close, improving the sealing and firmness of the welded connection, and avoiding fluid leakage caused by welding gaps; the limiting ring 14 is inserted into the pipe 11 to form double positioning inside and outside, enhancing the connection strength between pipe 11 and flange cover, and preventing pipe 11 from shifting or falling off due to vibration or pressure during loading and unloading.

[0042] The reinforcing plate 15 enhances the structural rigidity of the limiting ring 14, preventing deformation of the limiting ring 14. The arc design prevents scratching the inner wall of the pipe 11 or obstructing fluid flow. The limiting plate 16 further limits the position of the pipe 11, enhancing the stability of the pipe 11 and the rotary joint flange cover 10 during installation or welding. The stop plate 17 prevents the main sealing ring 73 from shifting. The multiple structures work together to improve the connection stability and sealing reliability of the device.

[0043] In this embodiment, a transition area is formed between adjacent limiting plates 16, and a sidewall sealing plate 18 is provided in the transition area. Adjacent limiting plates 16 are connected by the sidewall sealing plate 18. The bottom of the sidewall sealing plate 18 extends downward toward the transition area. The tops of multiple sidewall sealing plates 18 are connected by a transition strip 19. The transition strip 19 and the sidewall sealing plate 18 are integrally formed.

[0044] The side wall sealing plate 18 fills the gap between adjacent limiting plates 16, achieving a complete seal between the pipe 11 and the inner wall of the limiting ring 14, preventing fluid leakage from the gap, and further improving the overall sealing effect; the transition strip 19 connects multiple side wall sealing plates 18 to form an integrated sealing structure, improving the integrity and structural strength of the sealing components, and preventing individual sealing plates from shifting or being damaged.

[0045] The integrally molded transition strip 19 and side wall sealing plate 18 reduce assembly steps, reduce assembly errors, ensure the consistency of the sealing structure, and improve the ease of disassembly of sealing components, making maintenance and replacement easier.

[0046] In this embodiment, the bottom of the transition strip 19 is engaged with the top of the limiting plate 16, and the top of the transition strip 19 is arranged in an arc shape.

[0047] The bottom of the transition strip 19 is snapped onto the top of the limiting plate 16, making installation and disassembly convenient and facilitating the maintenance and replacement of sealing components, thus reducing maintenance costs. The arc-shaped design at the top of the transition strip 19 avoids damage to the inner wall of the pipe 11 caused by sharp edges, while guiding fluid to pass smoothly through the internal cavity, reducing fluid flow resistance and improving loading and unloading efficiency.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic rotary joint device for fluid loading and unloading arms, characterized in that, The device includes a rotary joint flange cover, a rotary outer joint, a connecting seat, a worm shaft, and a drive mechanism for welding connections with pipes connected to loading arms. The rotary joint flange cover is bolted to the top of the rotary outer joint. A worm wheel is fitted on the rotary outer joint. A connecting ring for placing the worm wheel is protruding on the outer wall of the rotary outer joint. The worm wheel and the connecting ring are bolted together. The drive mechanism and the worm shaft are respectively mounted on the connecting seat. The drive mechanism is connected to the worm wheel via the worm shaft. The rotary outer joint is sleeved on the double-race inner tube. The top of the double-race inner tube is connected to the rotary joint flange cover. The bottom of the double-race inner tube is welded with an upper necked welding flange. The upper necked welding flange is connected to the connecting seat by bolts. The bottom of the upper necked welding flange is connected to a lower necked welding flange by bolts.

2. The automatic rotary joint device for fluid loading and unloading arm as described in claim 1, characterized in that, The drive mechanism includes an explosion-proof servo motor and a planetary reducer. The explosion-proof servo motor is connected to the planetary reducer, and the planetary reducer is connected to the worm gear drive via a worm shaft.

3. The automatic rotary joint device for fluid loading and unloading arm as described in claim 2, characterized in that, The connecting seat includes a bearing mounting plate and a support. The bearing mounting plate is provided with two symmetrically arranged bearing seats, which are connected by a worm gear shaft. One end of the support is bolted to a bearing seat, and the other end of the support is connected to the planetary reducer.

4. The automatic rotary joint device for fluid loading and unloading arm as described in claim 3, characterized in that, The bearing mounting plate has a semi-circular notch. The bearing mounting plate is connected to the upper and lower necked welding flanges by multiple bolts along the edge of the semi-circular notch. The inner wall of the semi-circular notch is spaced apart from the upper part of the upper necked welding flange.

5. The automatic rotary joint device for fluid loading and unloading arm as described in any one of claims 1 to 4, characterized in that, The outer wall of the double raceway inner tube has two inwardly recessed inner raceway grooves, which are arranged alternately along the axial direction of the double raceway inner tube. The inner wall of the rotary outer joint has an outer raceway groove corresponding to the inner raceway grooves. The outer raceway groove of the rotary outer joint is rotatably engaged with the inner raceway groove through rolling balls.

6. The automatic rotary joint device for fluid loading and unloading arm as described in claim 5, characterized in that, The outer wall of the double raceway inner tube has two inwardly recessed sealing grooves, and a secondary sealing ring is provided in the sealing groove. The secondary sealing ring is located between the rotary outer joint and the double raceway inner tube. A rolling area is formed between the two sealing grooves, and the two inner raceway grooves are located in the rolling area.

7. The automatic rotary joint device for fluid loading and unloading arm as described in any one of claims 1 to 4, characterized in that, The rotary joint flange cover has an internal cavity that extends vertically. The bottom of the rotary joint flange cover is recessed to form an annular stepped groove, which is located at the bottom of the internal cavity. The top of the double-race inner tube is located in the annular stepped groove. The top of the double-race inner tube is provided with a main sealing ring. The double-race inner tube abuts against the top of the annular stepped groove through the main sealing ring. The inner sidewall of the main sealing ring is recessed inward to form a deformation groove, which is arranged around the circumference of the main sealing ring.

8. The automatic rotary joint device for fluid loading and unloading arm as described in claim 7, characterized in that, The top of the rotary joint flange cover is provided with an upward-protruding abutment ring step for connecting the bottom of the pipe. The abutment ring step is arranged at an inclination. The top of the abutment ring step is provided with a limiting ring for insertion into the pipe. The inner wall of the limiting ring is provided with a plurality of vertically arranged reinforcing plates. The reinforcing plates are vertically fixed on the inner wall of the limiting ring. The plurality of reinforcing plates are arranged at intervals around the inner circumference of the limiting ring. The end of the reinforcing plate facing the center of the inner cavity is arranged in an arc shape. The upper part of the reinforcing plate is exposed above the limiting ring, forming a limiting plate. The lower part of the reinforcing plate extends to the bottom of the internal cavity and is exposed on the inner side of the annular stepped groove, forming a stop plate.

9. The automatic rotary joint device for fluid loading and unloading arm as described in claim 8, characterized in that, A transition area is formed between adjacent limiting plates, and a sidewall sealing plate is provided in the transition area. The adjacent limiting plates are connected by the sidewall sealing plate. The bottom of the sidewall sealing plate extends downward toward the transition area. The tops of multiple sidewall sealing plates are connected by a transition strip. The transition strip and the sidewall sealing plate are integrally formed.

10. The automatic rotary joint device for fluid loading and unloading arm as described in claim 9, characterized in that, The bottom of the transition strip is engaged with the top of the limiting plate, and the top of the transition strip is arranged in an arc shape.

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