Airborne self-sealing device for a swivel

Abstract

The utility model discloses a kind of crane pipe pneumatic self-sealing devices, belong to fluid loading and unloading equipment technical field.The device includes pneumatic control system, sealing cap assembly, spherical sealing assembly and adjusting structure.Pneumatic control system is driven sealing cap assembly lifting by air cylinder, handle type pneumatic reversing valve controls gas source on-off;Sealing cap assembly is constituted by sealing cap rubber, fireproof sponge and multiple sealing structure, is nested in the recess in sealing cap cover plate bottom, is fixed by pressing ring compression;The spherical seat of spherical sealing assembly is clamped between upper cover plate and lower cover plate, supports dynamic deflection, self-adapting filling port inclination;The grab hook of adjusting structure is grabbed filling port by hinged support.The device is realized one-key sealing and separation by pneumatic automation, convenient operation;Spherical seat deflection compensation, fireproof sponge filling and multistage sealing structure cooperatively solve leakage problem, can be adapted to multiple different shapes of train filling port.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas filling technology, specifically to a pneumatic self-sealing device for loading arms. Background Technology

[0002] In train filling operations, the performance of the sealing device directly affects the safety and efficiency of the filling process. Traditional sealing devices mostly use mechanical seals, which are complex to operate and prone to leaks due to human error. Furthermore, because train filling ports vary in shape, traditional sealing devices are often ill-suited to these variations, increasing the risk of leakage.

[0003] Chinese Patent CN222099551U discloses a hydraulic sealing device for loading train loading arms, belonging to the field of oil and gas recovery. It solves the problems of poor sealing performance and difficulty in fitting pipe openings inherent in traditional sealing structures. It includes a sealing cover, a container assembly slidably connected to the outer wall of the loading arm's vertical pipe, a swing ball assembly connected to the end of the container assembly near the tank car opening, a sealing rubber plate disposed at the end of the swing ball assembly near the tank car opening, a sealing cover fixing clamp connected to the outer wall of the container assembly, and a sealing cover gas phase pipe communicating with the container assembly; a lifting guide rod, one end of which is connected to the sealing cover fixing clamp; a guide rod fixing clamp, the other end of which is slidably connected to the guide rod fixing clamp; a liquid level alarm and hydraulic cylinders, at least two of which are evenly distributed around the circumference of the loading arm's vertical pipe, with the fixed end of each hydraulic cylinder connected to a cylinder fixing hinge, which is connected to the loading arm. It is mainly used for oil and gas recovery. However, the above device cannot adapt to different shapes of train loading openings, limiting its applicability. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned prior art and expand the applicability of the device.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A pneumatic self-sealing device for loading arms, comprising:

[0007] A pneumatic control system, wherein the cylinder body of the pneumatic control system is vertically fixed to the upper surface of the sealing cap plate;

[0008] The piston rod end of the cylinder is connected to a pneumatic connecting pipe;

[0009] A handle-type pneumatic directional valve is installed on the side of the sealing cap and connected in series with a pneumatic connecting pipe;

[0010] The pneumatic silencer is connected to the top of the exhaust port of the handle-type pneumatic directional valve;

[0011] The second external thread quick connector is connected to the first external thread quick connector via an air supply hose;

[0012] A sealing cap assembly, wherein an aluminum tube is welded to the bottom of the sealing cap cover plate and a sealing external thread is welded to the top;

[0013] The sealing cap colloid is nested in the bottom groove of the sealing cap cover plate and is fixed by a pressure ring;

[0014] The sealing gasket and sealing packing are sequentially fitted onto the outer wall of the sealing welded external thread and fixed by the sealing nut from top to bottom;

[0015] Fire-retardant sponge is evenly filled inside the sealing cap colloid;

[0016] A spherical sealing assembly, wherein the spherical seat of the spherical sealing assembly is centrally sandwiched between the upper cover plate and the lower cover plate of the spherical seat;

[0017] An O-ring is fitted into the contact surface between the sealing cap and the cylinder;

[0018] The O-ring is fitted into the contact groove between the spherical seat and the upper cover plate of the spherical seat and the lower cover plate of the spherical seat;

[0019] The self-aligning seat retaining ring is welded to the top of the aluminum alloy vertical tube, and the self-aligning seat outer retaining ring is sleeved on the outside of the aluminum alloy vertical tube;

[0020] The adjustment structure is symmetrically fixed to the outer edge of the pressure ring by bolts.

[0021] The grab hook is hinged to the end of the bracket via a connecting shaft;

[0022] The claw part of the hook has an inwardly concave arc surface that fits the outer wall of the filling port.

[0023] By adopting the above technical solution, the cylinder body is vertically fixed to the sealing cap cover plate, and the piston rod is connected to the pneumatic connecting pipe to achieve precise transmission of pneumatic power; the sealing cap colloid is nested in the groove of the cover plate and pressed by the pressure ring, combined with fireproof sponge filling, to form an adaptive sealing structure; the spherical seat is clamped between the upper and lower cover plates, and is fitted with an O-ring to ensure dynamic sealing reliability; the bracket is fixed to the outer edge of the pressure ring, and the grab hook is hinged to the end of the bracket, its concave claw surface adaptively grabbing the filling port. The overall structure is compact, improving sealing performance and ease of operation.

[0024] Furthermore, the pneumatic connecting pipe passes through the sealing cap and connects to the cylinder piston rod;

[0025] The spherical seat is adapted to the spherical surfaces of the upper cover plate and the lower cover plate of the spherical seat.

[0026] By adopting the above technical solution, the pneumatic connecting pipe passes through the sealing cap plate and connects to the cylinder piston rod, shortening the air transmission distance and reducing pressure loss; the spherical fit design of the spherical seat and the upper and lower cover plates allows the sealing components to maintain a tight fit when deflected, enhancing the adaptability to the filling port angle deviation and further reducing the risk of leakage.

[0027] Furthermore, the aluminum alloy vertical tube is connected to the sealing cap assembly via flange one;

[0028] The U-shaped base plate of the handle is fixed to the sealing cap plate.

[0029] By adopting the above technical solution, the aluminum alloy vertical tube is connected to the sealing cap assembly through a flange, enabling modular disassembly and assembly, which facilitates maintenance; the U-shaped base plate of the handle is fixed to the sealing cap cover plate, providing a stable gripping point, simplifying the movement and positioning process of the device, and improving operating efficiency.

[0030] Furthermore, the gas source hose is made of composite hose material.

[0031] By adopting the above technical solution, the gas source hose is made of composite hose material, which takes into account both flexibility and pressure resistance. It avoids pipe bending and breakage when the device angle is compensated, ensures a stable gas supply, and reduces downtime maintenance caused by hose failure.

[0032] The aluminum tube is further pressed and welded with two flanges to form the main channel for fluid transmission.

[0033] By adopting the above technical solution, a second flange is welded to the end of the pressed aluminum tube to form an integrated main fluid transmission channel, eliminating connection gaps; the structure of the second flange enhances the pressure-bearing capacity of the pipeline, prevents fluid leakage, and ensures the efficiency and safety of the filling process.

[0034] Furthermore, the flange is a rotary joint flange;

[0035] The rotary joint flange is welded with an elbow for changing the direction of fluid transmission;

[0036] The external threaded fitting is installed in the threaded connection hole of the cylinder body.

[0037] By adopting the above technical solutions, the flange connection to the rotary joint flange enables flexible reversal of the fluid channel; the elbow is welded to the rotary joint flange to precisely change the fluid flow direction; and the external threaded fitting is installed on the cylinder body to ensure the air source interface is sealed. These three elements work together to optimize the fluid and air path layout, improving the overall system coordination.

[0038] This utility model has the following beneficial effects:

[0039] 1. This utility model uses a cylinder body that is vertically fixed to a sealing cap plate, a piston rod connected to a pneumatic connecting pipe, and a handle-type pneumatic reversing valve connected in series with the air circuit. This assembly relationship enables one-button pneumatic drive, replacing the traditional manual pressing operation, and significantly reducing the complexity of operation and the risk of human error.

[0040] 2. This utility model features a sealing cap that is nested within a groove in the cover plate and tightened by a pressure ring. The interior is filled with fire-retardant sponge. A sealing gasket and packing are fitted onto the welded external threads and secured by a screw-on nut. This multi-level nesting and screw-on locking design forms an adaptive sealing layer, effectively compensating for deformation of the filling nozzle, preventing leakage caused by the aging of traditional seals, and expanding the applicability of the device.

[0041] 3. This utility model forms a spherical cavity by clamping a spherical seat between the upper and lower cover plates, embedding an O-ring in the contact groove, and welding a self-aligning seat retaining ring to the top of the vertical pipe. This structure supports dynamic deflection compensation, adapts to the angle deviation of the train filling port, and solves the leakage problem caused by the mismatch of the pipe opening in traditional sealing.

[0042] 4. This utility model uses a bracket to be symmetrically fixed to the outer edge of the pressure ring by bolts, and the grab hook is hinged to the end of the bracket. Its concave claw surface is adapted to the outer wall of the filling port. This modular hinge design allows for quick disassembly and replacement of worn parts, avoids scrapping the entire device, and greatly reduces maintenance costs. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0044] Figure 2 This is a cross-sectional view of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of the cylinder of this utility model;

[0046] Figure 4 This is a schematic diagram of the sealing cap of this utility model;

[0047] Figure 5 This is a schematic diagram of the sealing assembly of this utility model.

[0048] Among them, 1-external threaded ferrule fitting; 2-external threaded quick-connect fitting; 3-elbow; 4-rotary joint flange; 5-O-ring; 6-O-ring; 7-O-ring; 8-O-ring; 9-Hexagon socket head cap screw pair; 10-Hexagon socket head cap screw pair; 11-Hexagon socket head cap screw pair; 12-Hexagon socket head cap screw pair; 13-Hexagon socket head cap screw pair; 14-ferrule four-way fitting; 15-ferrule fitting; 16-pressed aluminum tube; 17-pressure ring; 18-pressure ring; 19-external threaded quick-connect fitting; 20-sealing cap cover plate; 21-fireproof sponge; 22-sealing cap colloid; 23-sealing gasket; 24-sealing gasket. 25-Sealing gasket; 26-Sealing welded external thread; 27-Sealing nut; 28-Metal spiral wound gasket with inner ring; 29-Handle-type pneumatic directional valve; 30-Handle; 31-Hook; 32-Connecting shaft; 33-Bracket; 34-Bracket; 35-Pneumatic connecting pipe; 36-Pneumatic connecting pipe; 37-Pneumatic silencer; 38-Type I connector; 39-Cylinder; 40-Flange 1; 41-Flange 2; 43-Spherical seat; 44-Spherical seat upper cover plate; 45-Spherical seat lower cover plate; 46-Self-aligning seat outer retaining ring; 47-Self-aligning seat retaining ring; 48-Conical end internal hexagonal set screw; 49-Aluminum alloy vertical tube; 50-Air source hose. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0050] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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 component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0051] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As can be seen, this utility model discloses a pneumatic self-sealing device for loading arms. The cylinder body of the pneumatic control system cylinder 39 is vertically fixed to the center of the upper surface of the sealing cap cover plate 20 by multiple hexagonal screw pairs. The piston rod end is coaxially connected to the pneumatic connecting pipe 36 through an I-type connector 38. The handle-type pneumatic reversing valve 29 is bolted to the side of the sealing cap cover plate 20 and connected to the pneumatic connecting pipe 35 and the pneumatic connecting pipe 36 in series through a compression fitting four-way connector 14. The pneumatic silencer 37 is threaded to the top of the exhaust port of the reversing valve 29. The external thread quick connector 2 19 is inserted into the 90° external thread quick connector 1 2 through the air source hose 50 and is arranged along the side wall of the device. The sealing cap cover plate 20 of the sealing cap assembly is welded with a pressed aluminum tube 16 at the bottom and a sealing welded external thread 26 at the top. The sealing cap colloid 22 is nested in the annular groove at the bottom of the cover plate 20 and is secured by a pressure ring 17. The pressure ring 18 is circumferentially pressed and fixed, and its interior is filled with fireproof sponge 21; sealing gaskets 23, 24, and 25 are sequentially fitted onto the outer wall of the sealing welded external thread 26 and fixed by screwing on the sealing nut 27; the spherical seat 43 of the spherical sealing assembly is centrally sandwiched between the upper cover plate 44 and the lower cover plate 45 of the spherical seat, and the three are assembled with gaps to form a spherical sealing cavity; O-ring 5 is embedded in the contact surface between the sealing cap cover plate 20 and the cylinder 39; O-ring 6, O-ring 7... O-ring 8 is embedded in the annular sealing groove of spherical seat 43, upper cover plate 44 of spherical seat, and lower cover plate 45 of spherical seat; self-aligning seat retaining ring 47 is welded to the top of aluminum alloy vertical tube 49, and self-aligning seat outer retaining ring 46 is sleeved on the outside of retaining ring 47 and radially locked by tapered end set screw 48; adjustment structure, bracket 33, bracket 34 are symmetrically fixed to both sides of the outer edge of pressure ring 17 by bolts; grab hook 31 is hinged to the end of bracket through connecting shaft 32, the claw part is a concave arc surface adapted to the outer wall contour of filling port, flange 2 41 is welded to the end of pressed aluminum tube 16, flange 2 41 is bolted to rotary joint flange 4, 90° elbow 3 is welded to rotary joint flange 4; 90° external threaded fitting 1 is threaded to cylinder body air source interface of cylinder 39; handle 30 U-shaped base plate is bolted to the side of sealing cap cover plate 20.

[0052] Among them, the cylinder 39 is located at the center of the upper surface of the sealing cap cover plate 20, the pneumatic connecting pipe 36 passes through the sealing cap cover plate 20 and connects to the piston rod cavity, the ball seat 43 is clamped between the upper and lower cover plates and located at the top of the vertical pipe 49, the grab hooks 31 are symmetrically distributed on both sides of the outer edge of the pressure ring 17, and the fireproof sponge 21 fills the internal cavity of the sealing cap colloid 22.

[0053] In one embodiment, adaptive sealing is achieved through the following structural design to solve the leakage problem caused by differences in the shape of the filling port in traditional devices. The gripper 31 is hinged to the ends of the brackets 33 and 34 via a connecting shaft 32, forming a freely swinging robotic arm. The concave arc-shaped surface of the gripper 31's claw tightly conforms to the outer contour of the filling port, adaptively covering any shape, whether the filling port is round, elliptical, or irregular. The spherical seat 43 is sandwiched between the upper spherical seat 44 and the lower spherical seat cover 45, and the three are assembled with gaps to form a spherical sealing cavity, supporting 8° dynamic deflection limited by the outer retaining ring 46 of the self-aligning seat, automatically compensating for train tilting or filling port angle deviation. Fireproof sponge 21 is evenly filled inside the sealing cap colloid 22, elastically deforming under pressure to fill the tiny gaps between the filling port and the colloid. Under the circumferential compression of the pressure rings 17 and 18, the outer wall of the composite rubber colloid 22 tightly conforms to the surface of the filling port, adapting to uneven contact surfaces. The cylinder 39... The pneumatic connection pipe 36 receives air pressure signals, which push the sealing cap assembly to rise and fall vertically. The operator controls the pressing force with one button through the handle-type pneumatic reversing valve 29 to ensure that filling ports of different sizes receive uniform sealing pressure. When in use, the operator moves the device above the filling port, and the arc-shaped claw surface of the grab hook 31 automatically engages with the outer edge of the filling port. The pneumatic valve is activated, and the cylinder 39 pushes the sealing cap assembly down. The fireproof sponge 21 and the colloid 22 deform to fill the gap, and the spherical seat 43 deflects with the angle of the filling port to maintain tight contact of the spherical sealing cavity. After filling is completed, the cylinder retracts.

[0054] In one embodiment, the operator holds the handle 30 and moves the device directly above the filling port of the train, pressing it to make the sealing cap colloid 22 initially contact the filling port. The concave arc-shaped claw surface of the hook 31 automatically engages and positions itself on the outer edge of the filling port. The pneumatic reversing valve 29 is activated to connect the air source. The air source drives the piston rod of the cylinder 39 to extend through the air source hose 50, the external thread quick connector 2 19 and the external thread quick connector 1 2, and the pneumatic connecting pipe 36, pushing the sealing cap assembly upward so that the hook 31 tightly fits the lower part of the filling port. The spherical seat 43 deflects 8° between the upper spherical seat 44 and the lower cover plate spherical seat 45, and the self-aligning seat outer retaining ring 46 limits and compensates for the angle. To minimize deviation, the fireproof sponge 21 is filled with colloid 22 under pressure, and the gap between the filling port and the filling port is filled. The sealing gaskets 23 and 24 and the sealing packing 25 form multiple sealing layers under the pressure of the sealing nut 27, ensuring zero leakage. The fluid enters the filling port through the pressed aluminum tube 16, flange 2 41, rotary joint flange 4, and elbow 3. The spherical sealing cavity adapts to vibration and maintains constant air pressure. The reverse-shifting valve 29 cuts off the air source, and the piston rod of the cylinder 39 retracts, causing the device to separate. The handle 30 and the grab hook 31 achieve rapid alignment. Pneumatic drive reduces labor intensity. The spherical seat deflection, fireproof sponge filling, and multiple sealing structures work together to adapt to shape differences.

[0055] Working principle: The operator turns on the pneumatic reversing valve 29 to connect to the external air source. The air source drives the cylinder 39 through the air source hose 50, the external thread quick connector 2 19 and the external thread quick connector 1 2, and the pneumatic connecting pipe 36. This pushes the piston rod to extend and causes the sealing cap assembly to rise vertically, so that the grab hook 31 tightly fits against the lower part of the filling port to form the initial sealing pressure. The spherical seat 43 is assembled between the upper cover plate 44 and the lower cover plate 45 of the spherical seat through a gap to form a spherical sealing cavity, realizing the dynamic deflection of the self-aligning seat outer retaining ring 46 for limiting and adapting to the tilt angle of the filling port. The fireproof sponge 21 inside the sealing cap colloid 22 The pressure-elastic deformation fills the uneven gaps on the surface of the filling port. The composite rubber colloid conforms to the contour under the circumferential compression of the pressure rings 17 and 18. At the same time, the sealing gaskets 23 and 24 and the flexible graphite sealing packing 25 are spun onto the sealing welded external thread 26 through the sealing nut 27 to form a triple leak-proof barrier. The filling fluid enters the filling port through the pressed aluminum tube 16, flange 2 41, rotary joint flange 4, and 90° elbow 3. The spherical sealing cavity is finely adjusted with vibration to maintain tight contact. The pneumatic system maintains constant pressure to prevent seal failure. After the reverse-shifting reversing valve 29 cuts off the air source, the cylinder piston rod retracts, driving the device to automatically separate.

[0056] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A pneumatic self-sealing device for loading arms, characterized in that, include: A pneumatic control system, wherein the cylinder body of the cylinder (39) of the pneumatic control system is vertically fixed to the upper surface of the sealing cap plate (20); The piston rod end of the cylinder (39) is connected to the pneumatic connecting pipe (36). A handle-type pneumatic directional valve (29) is installed on the side of the sealing cap (20) and connected in series with a pneumatic connecting pipe; The pneumatic silencer (37) is connected to the top of the exhaust port of the handle-type pneumatic directional valve (29); The second external thread quick connector (19) is connected to the first external thread quick connector (2) through the air supply hose (50); A sealing cap assembly, wherein an aluminum tube (16) is welded to the bottom of the sealing cap cover plate (20) of the sealing cap assembly, and a sealing welding external thread (26) is welded to the top. The sealing cap colloid (22) is nested in the bottom groove of the sealing cap cover plate (20) and is fixed by a ring pressure ring; The sealing gasket and sealing packing (25) are sequentially fitted onto the outer wall of the sealing welded outer thread (26) and fixed by the sealing nut (27) from top to bottom; Fireproof sponge (21) is evenly filled inside the sealing cap colloid (22); A spherical sealing assembly, wherein the spherical seat (43) of the spherical sealing assembly is centrally sandwiched between the upper cover plate (44) and the lower cover plate (45) of the spherical seat; O-rings are fitted into the contact surfaces of the sealing cap (20) and the cylinder (39); The O-ring is fitted into the contact groove between the spherical seat (43) and the upper cover plate (44) and the lower cover plate (45) of the spherical seat; The self-aligning seat retaining ring (47) is welded to the top of the aluminum alloy vertical tube (49), and the self-aligning seat outer retaining ring (46) is sleeved on the outside of the aluminum alloy vertical tube (49); The adjustment structure is symmetrically fixed to the outer edge of the pressure ring (17) by bolts. The hook (31) is hinged to the end of the bracket via the connecting shaft (32); The claw of the hook (31) is an inwardly concave arc surface that fits the outer wall of the filling port.

2. The pneumatic self-sealing device for loading arms according to claim 1, characterized in that: The pneumatic connecting pipe (36) passes through the sealing cap plate (20) and connects to the piston rod of the cylinder (39); The spherical seat (43) is adapted to the spherical surfaces of the upper cover plate (44) and the lower cover plate (45) of the spherical seat.

3. The pneumatic self-sealing device for loading arms according to claim 1, characterized in that: The aluminum alloy vertical tube (49) is connected to the sealing cap assembly via flange one (40); The U-shaped base plate of the handle (30) is fixed to the sealing cap plate (20).

4. The pneumatic self-sealing device for loading arms according to claim 1, characterized in that: The gas source hose (50) is made of composite hose material.

5. The pneumatic self-sealing device for loading arms according to claim 1, characterized in that: Flange 2 (41) is welded onto the pressed aluminum tube (16) to form the main channel for fluid transmission.

6. The pneumatic self-sealing device for loading arms according to claim 5, characterized in that: The second flange (41) is connected to the rotary joint flange (4). An elbow (3) is welded onto the rotary joint flange (4) to change the direction of fluid transmission; The external threaded fitting (1) is installed in the threaded connection hole of the cylinder body (39).

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