Quick connecting device for LNG loading flange

Abstract

The invention discloses an LNG loading flange quick connecting device which comprises a clamp base, a push rod air cylinder, a pull rod air cylinder, a spring seat, a spring, an air cylinder connector, a push rod, a clamping jaw, a pull rod and a flange plate. Compared with an existing quick flange connecting device, the quick flange connecting device has the advantages that a cylinder and spring combined mechanism is adopted to compress a flange plate, the situation that the flange plate is loosened due to sudden failure of the cylinder is effectively avoided, and the safety of LNG (liquefied natural gas) filling operation is improved; and by adopting a hoop type connection mode, the device is convenient to disassemble and assemble and simple to operate.

Description

Technical Field

[0001] This invention patent belongs to the field of cryogenic quick connection devices, and relates to a new structure LNG loading quick connection device. Background Art

[0002] Liquefied natural gas is the form in which natural gas is compressed into a liquid, abbreviated as LNG. LNG is generally stored in large LNG storage tanks, transported through pipelines to LNG filling stations, and filled into tank trucks by the filling arms of the filling stations for transportation to various regions. During the LNG filling process, LNG liquid is filled into the tank truck through the filling arm pipeline, and the end of the filling arm is connected to the filling port of the tank truck through a bolted flange. Before and after the filling work, it is necessary to manually disassemble and assemble the bolts repeatedly. The disassembly and assembly time is long, the disassembly torque varies greatly, the degree of automation is low, the labor intensity is high, and with the excessive number of repeated disassembly times, the threads of the bolts are severely worn, and its failure time is not easy to evaluate, there is a possibility of sudden fracture, the replacement cycle is not easy to predict, and there are potential accident risks. Therefore, a quick connection device for LNG filling is needed to eliminate the process of workers disassembling and assembling bolts. The method of using a cylinder and a claw to clamp the flange can be adopted to replace the bolt connection, improve the automation level of the filling operation, and improve the filling operation efficiency. Summary of the Invention

[0003] This invention patent relates to an LNG loading flange quick connection device, including:

[0004] A clamp base, fixed to the outer surface of the filling arm joint through circumferentially distributed bolts;

[0005] A push rod cylinder group, composed of at least three push rod cylinders evenly arranged along the circumference of the clamp base and fixed to the front end of the clamp base through screws;

[0006] A flange plate, rigidly connected to the top of the piston rod of each push rod cylinder through countersunk head screws;

[0007] A spring mechanism, including a spring coaxially arranged with the push rod cylinder, the bottom of the spring is embedded in the spring seat at the top of the push rod cylinder, and the top is axially limited through the spring seat of the push rod;

[0008] A claw mechanism, including a plurality of claws hinged to the front end of the clamp base through pin shafts, and a boss with a double-ear structure is provided on the back of each claw;

[0009] A driving mechanism, including a pull rod cylinder and a pull rod hinged to its piston rod, and the pull rod forms a linkage with the boss of the claw through a pin shaft.

[0010] The top of the piston rod of the push rod cylinder is provided with a cylinder joint connected by threads, the cylinder joint forms a rotatable connection with the push rod through a pin shaft, and an axial guiding structure is provided between the push rod and the flange plate.

[0011] The axial guiding structure includes a guiding hole on the flange plate and a guiding protrusion provided on the surface of the push rod. The guiding protrusion is in clearance fit with the guiding hole, and the tolerance range is 0.05 - 0.1 mm.

[0012] The spring seat is fixed to the top of the piston rod of the push rod cylinder by screws. An annular groove is provided in its inner cavity for fitting the positioning ring at the bottom end of the spring. The pre-tightening force of the spring is 10% - 15% of the rated thrust of the push rod cylinder.

[0013] The boss of the claw is of a double-ear type structure. The distance between the ear pieces matches the U-shaped joint at the end of the pull rod, and two-way force-bearing hinging is achieved through a shaft pin.

[0014] The pull rod cylinder is installed on the side wall of the clamp base through a hinged support. An adjustable threaded joint is provided at the end of its piston rod for adjusting the effective length of the pull rod, and the adjustment range is ±5 mm.

[0015] The inner working surface of the claw is provided with anti-slip lines. The depth of the lines is 0.5 - 1 mm, and the angle of the lines is 30° - 45°.

[0016] This application includes a clamp base, a push rod cylinder, a pull rod cylinder, a spring seat, a spring, a cylinder joint, a push rod, a claw, a pull rod, and a flange plate. The clamp base is provided with screw holes. Four push rod cylinders are symmetrically installed on the clamp base along the circumferential direction. The clamp base is installed on the filling arm joint through bolts. The spring seat is installed on the top of the push rod cylinder, the spring is installed in the spring seat, and the push rod is connected to the spring. The push rod cylinder joint is installed on the piston rod of the cylinder through threaded connection, and the cylinder joint is connected to the push rod through a shaft pin. The flange plate is provided with countersunk screw holes, and the flange plate is connected to the push rod through countersunk screws. There are two pull rod cylinders, which are symmetrically installed on the clamp base along the circumferential direction through shaft pins. The claw is connected to the clamp base through a shaft pin. The claw is provided with a boss, the boss is connected to the pull rod through a shaft pin, and the pull rod is connected to the cylinder joint through a shaft pin. Compared with the existing flange quick connection device, this invention patent uses a combined mechanism of a cylinder and a spring to realize the clamping of the flange plate, effectively avoiding the loosening of the flange plate caused by the sudden failure of the cylinder, and improving the safety of LNG filling operations; it uses a clamp-type connection method, which is convenient for disassembly and installation and simple to operate.

[0017] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0018] (1) By using the method of driving the claw by a cylinder to clamp the flange, the rapid connection between the LNG filling arm and the tanker flange is realized, eliminating the manual work of disassembling and installing bolts, and significantly improving the LNG filling efficiency.

[0019] (2) The combination structure of the cylinder and the spring is adopted to make the quick connection device have a self-locking function, effectively avoiding the loosening of the flange plate caused by the sudden failure of the cylinder, and improving the safety of LNG filling operations.

[0020] (3) The device adopts a clamp connection method. Two clamps are fixed on the filling arm joint through bolts, and it can be directly installed on the original flange joint of the filling arm, with good adaptability, and is convenient for disassembly and assembly, and the operation is simple. Brief Description of the Drawings

[0021] Figure 1 It is an overall schematic diagram of a quick connection device for LNG loading flange;

[0022] Figure 2 It is a lateral overall schematic diagram of a quick connection device for LNG loading flange;

[0023] Figure 3 It is a partial structural schematic diagram of a quick connection device for LNG loading flange;

[0024] Figure 4 It is a partial cross-sectional view of a quick connection device for LNG loading flange;

[0025] Figure 5 It is an overall cross-sectional view of a quick connection device for LNG loading flange;

[0026] Figure 6 It is a schematic diagram of the clamp base of a quick connection device for LNG loading flange;

[0027] Figure 7 It is a schematic diagram of the claw of a quick connection device for LNG loading flange;

[0028] Figure 8 It is a schematic diagram of the push rod of a quick connection device for LNG loading flange.

[0029] Among them, 1. Clamp base, 2. Push rod cylinder, 3. Claw, 4. Pull rod cylinder, 5. Tank truck joint flange, 6. Flange plate, 7. Push rod, 8. Cylinder joint, 9. Spring, 10. Tank truck joint, 11. Pull rod, 12. Spring seat, 13. Filling arm joint, 101. Bolt hole, 102. Screw hole, 103. Pin shaft hole, 104. Clamp, 301. Boss, 302. Pin shaft hole, 701. Spring seat, 702. Pin shaft hole, 703. Countersunk head screw hole. Detailed Description of the Specific Embodiment

[0030] The following is a detailed description of the specific embodiment of the present invention. It should be understood that the specific embodiment described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] Example 1:

[0032] A quick connection device for LNG loading, comprising:

[0033] A clamp base, which is fixed on the outer surface of the filling arm joint by bolts distributed circumferentially;

[0034] A push rod cylinder group, which consists of at least three push rod cylinders evenly arranged along the circumference of the clamp base and is fixed on the front end of the clamp base by screws;

[0035] A flange plate, which is rigidly connected to the top of the piston rod of each push rod cylinder by countersunk head screws;

[0036] A spring mechanism, which includes a spring coaxially arranged with the push rod cylinder. The bottom of the spring is embedded in the spring seat at the top of the push rod cylinder, and the top is axially limited by the spring seat of the push rod;

[0037] A claw mechanism, which includes a plurality of claws hinged to the front end of the clamp base by pin shafts. A boss with a double-ear structure is provided on the back of each claw;

[0038] A driving mechanism, which includes a pull rod cylinder and a pull rod hinged to its piston rod. The pull rod forms a linkage with the boss of the claw through a pin shaft.

[0039] A cylinder joint connected by thread is provided at the top of the piston rod of the push rod cylinder. The cylinder joint is rotatably connected to the push rod through a pin shaft, and an axial guiding structure is provided between the push rod and the flange plate.

[0040] The axial guiding structure includes a guiding hole on the flange plate and a guiding protrusion arranged on the surface of the push rod. The guiding protrusion is in clearance fit with the guiding hole, and the tolerance range is 0.05 - 0.1 mm.

[0041] The spring seat is fixed on the top of the piston rod of the push rod cylinder by screws. An annular groove is provided in its inner cavity for fitting the positioning ring at the bottom end of the spring. The pre-tightening force of the spring is 10% - 15% of the rated thrust of the push rod cylinder.

[0042] The boss of the claw is of a double-ear structure. The distance between the ear pieces is matched with the U-shaped joint at the end of the pull rod, and the two-way force-bearing hinge is realized through a pin shaft.

[0043] The pull rod cylinder is installed on the side wall of the clamp base through a hinge support. An adjustable thread joint is provided at the end of its piston rod for adjusting the effective length of the pull rod, and the adjustment range is ±5 mm.

[0044] Anti-slip lines are provided on the inner working surface of the claw. The depth of the lines is 0.5 - 1 mm, and the angle of the lines is 30° - 45°.

[0045] Example 2:

[0046] A quick connection device for LNG loading, comprising a clamp base 1, a push rod cylinder 2, a claw 3, a pull rod cylinder 4, a flange plate 6, a push rod 7, a cylinder joint 8, a spring 9, a pull rod 11 and a spring seat 12. The clamp base 1 is provided with screw holes 102, and a plurality of push rod cylinders 2 are symmetrically installed on the clamp base 1 along the circumferential direction. The clamp base 1 is installed on the filling arm joint 13 through a clamp 104 and locked by bolts. The spring seat 12 is installed on the top of the push rod cylinder 2, the spring 9 is installed in the spring seat 12, and the push rod 7 is connected to the spring 9. The push rod cylinder joint 8 is installed on the cylinder piston rod by threaded connection, and the cylinder joint 8 is connected to the push rod 7 through a shaft pin. The flange plate 6 is provided with countersunk screw holes, and the flange plate 6 is connected to the push rod 7 through countersunk screws. There are two pull rod cylinders 4, which are symmetrically installed on the clamp base 1 along the circumferential direction through shaft pins. The claw 3 is connected to the clamp base 1 through a shaft pin, the claw 3 is provided with a boss 301, the boss 301 is connected to the pull rod 11 through a shaft pin, and the pull rod 11 is installed on the pull rod cylinder 4 through a shaft pin.

[0047] When the present invention patent is in use, it is fixed on the filling arm joint 13 through two clamp bases 1. Before the LNG liquid filling operation, the filling arm joint 13 is first aligned with the tank truck joint 10. Then the push rod cylinder 2 pushes the flange plate 6 to press against the flange of the tank truck joint 5. After the two flanges are pressed together, the pull rod cylinder 4 pushes the claw 3 to clamp the flange of the tank truck joint 5, completing the quick connection between the filling arm joint 13 and the tank truck joint 10. After the LNG liquid filling operation is completed, the push rod cylinder 2 pushes the spring 9 to further contract, so that the flange plate 6 is separated from the flange of the tank truck joint 5. The pull rod cylinder 4 pulls the claw 3, and the claw 3 is separated from the flange of the tank truck joint 5, completing the separation between the filling arm joint 13 and the tank truck joint 10.

Claims

1. A LNG loading flange quick connection device, characterized in that: include: The clamp base is fixed to the outer surface of the filling arm joint by circumferentially distributed bolts; The push rod cylinder group consists of at least three push rod cylinders evenly arranged along the circumference of the clamp base and fixed to the front end of the clamp base by screws; The flange plate is rigidly connected to the top of the piston rod of each push rod cylinder through countersunk screws; The spring mechanism comprises a spring coaxially arranged with the push rod cylinder, the bottom of the spring is embedded in the spring seat at the top of the push rod cylinder, and the top is axially limited by the spring seat of the push rod; The claw mechanism comprises a plurality of claws hinged to the front end of the clamp base through an axle pin, and a boss with a double-ear structure is provided on the back of each claw; The driving mechanism comprises a pull rod cylinder and a pull rod hinged to the piston rod thereof, wherein the pull rod is linked with the boss of the clamping claw through an axle pin.

2. The LNG loading flange quick connection device according to claim 1 is characterized in that: A cylinder joint connected by a thread is provided at the top end of the piston rod of the push rod cylinder. The cylinder joint is rotatably connected to the push rod through an axle pin, and an axial guide structure is provided between the push rod and the flange plate.

3. The LNG loading flange quick connection device according to claim 2 is characterized in that: The axial guide structure includes a guide hole on the flange plate and a guide protrusion arranged on the surface of the push rod. The guide protrusion and the guide hole are clearance-matched, and the tolerance range is 0.05-0.1mm.

4. The LNG loading flange quick connection device according to claim 1 is characterized in that: The spring seat is fixed to the top of the piston rod of the push rod cylinder by screws, and its inner cavity is provided with an annular groove for engaging the positioning ring at the bottom end of the spring. The preload force of the spring is 10%-15% of the rated thrust of the push rod cylinder.

5. The LNG loading flange quick connection device according to claim 1 is characterized in that: The boss of the clamping claw is a double-ear structure, the ear spacing matches the U-shaped joint at the end of the pull rod, and a two-way force-bearing hinge is achieved through an axle pin.

6. The LNG loading flange quick connection device according to claim 1 is characterized in that: The pull rod cylinder is installed on the side wall of the clamp base through a hinged support, and an adjustable threaded joint is provided at the end of the piston rod to adjust the effective length of the pull rod, and the adjustment range is ±5mm.

7. The LNG loading flange quick connection device according to any one of claims 1 to 6, characterized in that: The inner working surface of the clamping claw is provided with anti-slip grooves, the groove depth is 0.5-1mm, and the groove angle is 30°-45°.

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