An LNG unloading arm structure

Abstract

The present invention discloses an LNG unloading arm structure, belonging to the technical field of LNG unloading. It includes a riser pipe, a connecting seat is provided at the upper end of the riser pipe, and a first rotating frame is installed on the connecting seat. The end of the first rotating frame is connected to a second rotating frame. An articulated unloading pipe is provided on the first rotating frame and the second rotating frame, and a buffer structure is installed on the riser pipe. The buffer structure can play a buffering role when the unloading arm is retracted, avoiding direct impact between the second rotating frame and the riser pipe. It is installed and used in cooperation with the fixing plate, which can not only be positioned during installation but also ensure the stability after installation. The buffer contact member conducts the first buffering at the moment of contact, and in cooperation with structures such as springs, the buffering effect is improved. The pushing structure can assist in pushing when the unloading arm is unfolded, ensuring that the unloading arm can be quickly extended. Through the provided pushing frame, the rotating sleeve rolls during the process of pushing the unloading arm, ensuring the pushing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of LNG unloading, and particularly relates to a structure of an LNG unloading arm. Background Art

[0002] An LNG unloading arm refers to a structure for liquefied natural gas unloading and transportation, which is an articulated pipeline system installed on a wharf (or floating terminal) for unloading. When an LNG carrier arrives at the dedicated wharf of the receiving station, through the liquid-phase unloading arm and the unloading pipeline, the LNG is sent into the storage tank of the receiving station by using the cryogenic pump on the ship. At the same time, the BOG gas in the storage tank returns to the LNG carrier through the return gas pipeline and the gaseous return gas arm. The LNG unloading arm mainly consists of a riser, a rotating arm, a conveying pipe, a rotary joint, a balance wheel, and a counterweight block. Among them, the conveying pipe is installed on the rotating arm and is a structure for LNG transportation.

[0003] When the existing LNG unloading arm is in use, the conveying pipe can rotate together with the rotating arm. After the unloading is completed, the rotating arm and other structures will be stored in a vertical state. During this process, the outermost rotating arm may touch the riser, resulting in impact collision with the riser, and damage may occur, affecting the integrity of the entire unloading arm structure. At the same time, when the unloading arm is unfolded for use, it is driven by a driving structure for unfolding, without the assistance of other structures, which is time-consuming and laborious, and the use effect is average. Summary of the Invention

[0004] The main purpose of the present invention is to provide a structure of an LNG unloading arm, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] An LNG unloading arm structure includes a riser. A connecting seat is provided at the upper end of the riser, and a first rotating frame is installed on the connecting seat. The end of the first rotating frame is connected to a second rotating frame. An articulated unloading pipe is provided on the first rotating frame and the second rotating frame. A buffer structure is installed on the riser, and the buffer structure includes a fixing plate, a mounting frame, a movable rod, a spring, and a buffer contact member. The fixing plate is fixed on the riser. The mounting frame is sleeved on the riser and is installed on the fixing plate. The movable rod is connected to the mounting frame. The spring is sleeved on the movable rod. The buffer contact member is fixedly connected to the end of the movable rod. A pushing structure is installed on the riser, and the pushing structure includes a support plate, an electric push rod, a telescopic shaft, and a pushing frame. The support plate is fixed on the riser. The electric push rod is installed on the support plate. The end of the telescopic shaft is connected to the pushing frame, and the telescopic shaft is arranged on the electric push rod.

[0007] Preferably, a bottom plate is fixedly installed at the lower end of the riser pipe, and a reinforcing plate is provided between the bottom plate and the riser pipe. The connection mode between the bottom plate and the riser pipe is welding, and through holes are formed in the bottom plate.

[0008] Preferably, a balance wheel is provided on the first rotating frame, and a balance steel cable is provided between the balance wheels. A rotary joint is arranged at the end of the discharge pipe.

[0009] Preferably, the pushing structure is located above the buffer structure, and a counterweight is arranged on the first rotating frame.

[0010] Preferably, the buffer structure further includes a limiting block. The fixing plate is welded to the riser pipe, the mounting frame is fixedly connected to the fixing plate, the limiting block is fixed at the end of the movable rod, and the ends of the springs are respectively in contact with the mounting frame and the buffer contact member.

[0011] Preferably, the mounting frame includes a first connecting sleeve, a second connecting sleeve, a first connecting plate, a positioning hole, a second connecting plate, a positioning column, a through hole and a mounting bolt. The first connecting plate is fixed at the end of the first connecting sleeve, the positioning hole is formed in the first connecting plate, the second connecting plate is fixedly connected to the positioning column, and the second connecting plate is arranged at the end of the second connecting sleeve. The positioning column passes through the positioning hole in the first connecting plate. The through hole is formed in the first connecting plate and the second connecting plate. The mounting bolt is arranged on the first connecting sleeve and the second connecting sleeve, and the first connecting sleeve and the second connecting sleeve are sleeved on the riser pipe. The end of the mounting bolt is threadedly connected to the fixing plate, and the first connecting sleeve and the second connecting sleeve are fixed to the fixing plate through the mounting bolt.

[0012] Preferably, the buffer contact member includes an assembly plate, a spring piece, a round block, a threaded hole and a rubber pad. The assembly plate is fixedly connected to the spring piece. The threaded hole is formed in the round block, and the round block is fixedly installed on the assembly plate. The round block is arranged at the corner position of the assembly plate, and the round block is fixedly connected to the end of the movable rod through the threaded hole. The rubber pad is fixedly installed on the assembly plate.

[0013] Preferably, the pushing structure further includes a support seat and a driving motor. The support seat is fixedly installed on the support plate, and the support plate is welded to the riser pipe. The electric push rod is installed on the support seat, the driving motor is arranged at the end of the electric push rod, and the pushing frame is fixed at the end of the telescopic shaft.

[0014] Preferably, the pushing frame includes a fixed seat, a round rod and a rotating sleeve. The round rod is installed between the fixed seats, and the fixed seats are connected to the telescopic shaft. The rotating sleeve is installed on the round rod, and the rotating sleeve is rotatably connected to the round rod.

[0015] Preferably, maintenance windows for maintenance are provided on the riser pipe, and the number of the maintenance windows is two. Tempered glass that can be detached is provided in the maintenance windows.

[0016] Compared with the prior art, the present invention has the following beneficial effects: for the LNG unloading arm structure, 1. Through the provided buffer structure, when the unloading arm is retracted, it can play a buffering role to avoid direct impact between the second rotating frame and the riser pipe;

[0017] 2. By adopting the mounting frame and cooperating with the fixing plate for use, it can not only be positioned during installation but also ensure the stability after installation. The structure is simple and the use effect is good;

[0018] 3. Through the provided buffer contact member, the first buffer is carried out at the moment of contact. Cooperating with structures such as springs for use, the buffering effect is improved. At the same time, the buffer contact member can be detached, which is convenient for disassembly and replacement;

[0019] 4. By adopting the pushing structure, when the unloading arm unfolds for work, it can assist in pushing to ensure that the unloading arm can be quickly extended;

[0020] 5. Through the provided pushing frame, the rotating sleeve rolls during the process of pushing the unloading arm, ensuring that no large frictional force is generated during the pushing process and guaranteeing the pushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an LNG unloading arm structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure at the connection seat of an LNG unloading arm structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure at the riser pipe of an LNG unloading arm structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the buffer structure of an LNG unloading arm structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the mounting frame of an LNG unloading arm structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the buffer contact member of an LNG unloading arm structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the pushing structure of an LNG unloading arm structure of the present invention;

[0028] Figure 8 It is a schematic diagram of the pushing frame of an LNG unloading arm structure of the present invention.

[0029] In the figure: 1, riser pipe; 2, connecting seat; 3, first rotating frame; 4, second rotating frame; 5, discharge pipe; 6, buffer structure; 601, fixing plate; 602, mounting frame; 6021, first connecting sleeve; 6022, second connecting sleeve; 6023, first connecting plate; 6024, positioning hole; 6025, second connecting plate; 6026, positioning post; 6027, through hole; 6028, mounting bolt; 603, movable rod; 604, limiting block; 605, spring; 606, buffer contact member; 6061, assembly plate; 6062, elastic sheet; 6063, round block; 6064, threaded hole; 6065, rubber pad; 7, pushing structure; 701, support plate; 702, support seat; 703, electric push rod; 704, telescopic shaft; 705, driving motor; 706, pushing frame; 7061, fixing seat; 7062, round rod; 7063, rotating sleeve; 8, bottom plate; 9, inspection window; 10, balance wheel; 11, rotary joint; 12, counterweight. Detailed implementation manners

[0030] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0031] As Figures 1 - 8 shown, an LNG unloading arm structure includes a riser pipe 1. A connecting seat 2 is provided at the upper end of the riser pipe 1, and a first rotating frame 3 is installed on the connecting seat 2. The end of the first rotating frame 3 is connected to a second rotating frame 4. An articulated discharge pipe 5 is provided on the first rotating frame 3 and the second rotating frame 4. A buffer structure 6 is installed on the riser pipe 1. A pushing structure 7 is installed on the riser pipe 1. The lower end of the riser pipe 1 is fixedly installed with a bottom plate 8, and a reinforcing plate is provided between the bottom plate 8 and the riser pipe 1. The connection manner between the bottom plate 8 and the riser pipe 1 is welding, and a through hole is opened on the bottom plate 8. Balance wheels 10 are provided on the first rotating frame 3, and balance steel cables are provided between the balance wheels 10. A rotary joint 11 is provided at the end of the discharge pipe 5. The pushing structure 7 is located above the buffer structure 6. A counterweight 12 is provided on the first rotating frame 3. An inspection window 9 for maintenance is provided on the riser pipe 1, and the number of the inspection windows 9 is two. Removable tempered glass is provided in the inspection window 9.

[0032] Before using the unloading arm, assemble and fix the unloading arm. The riser 1 is placed on the ground at a suitable position through the bottom plate 8. Pass the mounting piece through the through hole on the bottom plate 8 to fix the bottom plate 8 to the ground. At this time, under the action of the reinforcing plate, the riser 1 is stably arranged on the bottom plate 8. Install the connecting seat 2 at the upper end of the riser 1. The first rotating frame 3 and the second rotating frame 4 are connected to the connecting seat 2. At the same time, a driving structure is provided at the end position of the rotating frame. Install the articulated unloading pipe 5 on the first rotating frame 3 and the second rotating frame 4. Install the rotary joint 11 at the end of the unloading pipe 5. At the same time, the other end of the unloading pipe 5 is connected to the corresponding conveying pipeline. Then install the buffer structure 6 and the pushing structure 7 on the riser 1 respectively. In this way, the assembly and fixing work of the entire unloading arm is completed. In the initial stage, the unloading arm is in a retracted state. At this time, the first rotating frame 3 and the second rotating frame 4 are in a vertical state. At the same time, the lower end of the second rotating frame 4 contacts the buffer structure 6. When the LNG carrier arrives at the special terminal of the receiving station, start the unloading arm. The driving structure runs to drive the first rotating frame 3 and the second rotating frame 4 to rotate, so as to drive the corresponding articulated unloading pipe 5 to run until the rotary joint 11 at the end of the unloading pipe 5 approaches the carrier at the terminal. During this process, the balance cable moves on the balance wheel 10 and cooperates with the counterweight 12 to ensure the balance and stability of the entire unloading arm. At the same time, during the unfolding process of the unloading arm, the pushing structure 7 plays an auxiliary pushing role, enabling the unloading arm to unfold quickly. The structure is simple and the use effect is excellent. After the unloading arm is unfolded, connect the rotary joint 11 to the pipeline transported on the carrier. After starting the cryogenic pump on the carrier, LNG enters the unloading pipe 5 from the storage device on the carrier. Then LNG flows along the unloading pipe 5 and finally is unloaded into the storage tank in the receiving station through the conveying pipe. In this way, the unloading work of LNG is realized. After the unloading work is completed, disassemble the pipeline from the rotary joint 11, and then start the driving structure to retract the first rotating frame 3 and the second rotating frame 4. During this process, when the second rotating frame 4 is retracted to a nearly vertical state, the end of the second rotating frame 4 will contact the buffer structure 6. The buffer structure 6 plays a buffering role for the second rotating frame 4 during the retraction process, which can prevent the second rotating frame 4 from directly hitting the riser 1, thereby avoiding damage to the second rotating frame 4 and the riser 1 and ensuring the integrity of the entire unloading arm. When needed, the inside of the riser 1 can be repaired through the inspection window 9 to ensure the use effect of the entire unloading arm.

[0033] Through the above embodiments, the buffer structure 6 includes a fixing plate 601, a mounting bracket 602, a movable rod 603, a spring 605, and a buffer contact member 606. The fixing plate 601 is fixed on the riser pipe 1. The mounting bracket 602 is sleeved on the riser pipe 1 and is mounted on the fixing plate 601. The movable rod 603 is connected to the mounting bracket 602. The spring 605 is sleeved on the movable rod 603. The buffer contact member 606 is fixedly connected to the end of the movable rod 603. The buffer structure 6 further includes a limit block 604. The fixing plate 601 is welded to the riser pipe 1. The mounting bracket 602 is fixedly connected to the fixing plate 601. The limit block 604 is fixed at the end of the movable rod 603. The end portions of the spring 605 are respectively in contact with the mounting bracket 602 and the buffer contact member 606. The mounting bracket 602 includes a first connecting sleeve 6021, a second connecting sleeve 6022, a first connecting plate 6023, a positioning hole 6024, a second connecting plate 6025, a positioning post 6026, a through hole 6027, and a mounting bolt 6028. The first connecting plate 6023 is fixed at the end of the first connecting sleeve 6021. The positioning hole 6024 is opened on the first connecting plate 6023. The second connecting plate 6025 is fixedly connected to the positioning post 6026 and is arranged at the end of the second connecting sleeve 6022. The positioning post 6026 passes through the positioning hole 6024 on the first connecting plate 6023. The through hole 6027 is opened on the first connecting plate 6023 and the second connecting plate 6025. The mounting bolt 6028 is arranged on the first connecting sleeve 6021 and the second connecting sleeve 6022. The first connecting sleeve 6021 and the second connecting sleeve 6022 are sleeved on the riser pipe 1. The end of the mounting bolt 6028 is threadedly connected to the fixing plate 601. The first connecting sleeve 6021 and the second connecting sleeve 6022 are fixed on the fixing plate 601 through the mounting bolt 6028. The buffer contact member 606 includes an assembly plate 6061, a spring piece 6062, a round block 6063, a threaded hole 6064, and a rubber pad 6065. The assembly plate 6061 is fixedly connected to the spring piece 6062. The threaded hole 6064 is opened on the round block 6063, and the round block 6063 is fixedly installed on the assembly plate 6061. The round block 6063 is arranged at the corner position of the assembly plate 6061 and is fixedly connected to the end of the movable rod 603 through the threaded hole 6064. The rubber pad 6065 is fixedly installed on the assembly plate 6061. By providing the buffer structure 6, when the unloading arm is retracted, it can play a buffering role to avoid direct impact between the second rotating frame 4 and the riser pipe 1. By using the mounting bracket 602 in cooperation with the fixing plate 601, it can not only be positioned during installation but also ensure the stability after installation. The structure is simple and the use effect is good. By providing the buffer contact member 606, the first buffering is performed at the moment of contact. In cooperation with structures such as the spring 605, the buffering effect is improved. At the same time, the buffer contact member 606 can be disassembled, which is convenient for disassembly and replacement.

[0034] When installing the buffer structure 6, the first connecting sleeve 6021 and the second connecting sleeve 6022 in the mounting bracket 602 are sleeved on the riser 1, so that the first connecting sleeve 6021 and the second connecting sleeve 6022 are placed on the fixing plate 601. At this time, the first connecting plate 6023 and the second connecting plate 6025 at the ends of the two connecting sleeves are in contact with each other. At the same time, the positioning post 6026 on the second connecting plate 6025 is inserted into the positioning hole 6024 on the first connecting plate 6023. Under the combined action of the positioning post 6026 and the positioning hole 6024, the two connecting sleeves can be accurately matched. After the connecting sleeves are fitted together, adjust the relative positions of the connecting sleeves so that the holes on the connecting sleeves are aligned with the connecting screw holes on the fixing plate 601. Install the mounting bolts 6028 in the holes on the first connecting sleeve 6021 and the second connecting sleeve 6022, and screw the ends of the mounting bolts 6028 into the connecting screw holes, thereby fixing the first connecting sleeve 6021 and the second connecting sleeve 6022 to the fixing plate 601. In this way, the installation and fixation of the mounting bracket 602 are completed. At this time, the through holes 6027 on the first connecting plate 6023 and the second connecting plate 6025 are aligned. Subsequently, the installation of the movable rod 603 and the buffer contact member 606 is started. One end of the movable rod 603 passes through the through holes 6027 on the first connecting plate 6023 and the second connecting plate 6025. A spring 605 is sleeved on the end of the movable rod 603 away from the limit block 604. Then, the buffer contact member 606 is brought close to the end of the movable rod 603, and the end of the movable rod 603 is screwed into the threaded hole 6064 on the round block 6063, thereby completing the installation of the current movable rod 603 and the buffer contact member 606. According to the above process, the installation and connection of other movable rods 603 are carried out until all the movable rods 603 pass through the mounting bracket 602 and the movable rod 603 is connected to the buffer contact member 606, thereby realizing the installation of the movable rod 603 and the buffer contact member 606. At this time, the rubber pad 6065 on the assembly plate 6061 faces the riser 1. After the entire buffer structure 6 is installed, it starts to be used. During the use of the buffer structure 6, when the second rotating frame 4 is retracted to a nearly vertical state, the end of the second rotating frame 4 contacts the elastic piece 6062, and the elastic piece 6062 deforms elastically under the force, thereby forming the first buffer. At the same time, the elastic piece 6062 transmits the acting force to the assembly plate 6061, and the assembly plate 6061 moves in the direction of the riser 1 through the movable rod 603. During this process, the distance between the buffer contact member 606 and the mounting bracket 602 becomes smaller, and the spring 605 is compressed to form the second buffer. Under the action of the two buffers, the second rotating frame 4 is effectively buffered, and the second rotating frame 4 can be prevented from directly hitting the riser 1, ensuring the integrity of the second rotating frame 4 and the riser 1. During the process of the buffer contact member 606 moving in the direction of the riser 1 for the second buffer, if the buffer spring 605 is damaged and cannot buffer normally, at this time, the damaged spring 605 still plays a partial buffering effect.After the rubber pad 6065 on the mounting plate 6061 comes into contact with the riser pipe 1, it is restricted by the riser pipe 1 and no longer moves. During this process, the rubber pad 6065 plays a protective role and can protect the riser pipe 1 and the buffer contact member 606, ensuring the integrity of the buffer structure 6. When the unloading arm is deployed, the buffer structure 6 can also play a pushing role. The buffer contact member 606 is reset under the action of the spring 605 and continues to buffer during the next storage. When the spring 605 needs to be replaced, the corresponding movable rod 603 is removed, and then the spring 605 is replaced and the movable rod 603 is reinstalled. The structure is simple and the operation is convenient and fast.

[0035] Through the above embodiments, the pushing structure 7 includes a support plate 701, an electric push rod 703, a telescopic shaft 704 and a pushing frame 706. The support plate 701 is fixed on the riser pipe 1. The electric push rod 703 is installed on the support plate 701. The end of the telescopic shaft 704 is connected to the pushing frame 706, and the telescopic shaft 704 is arranged on the electric push rod 703. The pushing structure 7 further includes a support seat 702 and a driving motor 705. The support seat 702 is fixedly installed on the support plate 701, and the support plate 701 is welded to the riser pipe 1. The electric push rod 703 is installed on the support seat 702. The driving motor 705 is arranged at the end of the electric push rod 703. The pushing frame 706 is fixed at the end of the telescopic shaft 704. The pushing frame 706 includes a fixed seat 7061, a round rod 7062 and a rotating sleeve 7063. The round rod 7062 is installed between the fixed seats 7061, and the fixed seat 7061 is connected to the telescopic shaft 704. The rotating sleeve 7063 is installed on the round rod 7062, and the rotating sleeve 7063 is rotatably connected to the round rod 7062. By adopting the pushing structure 7, during the deployment of the unloading arm, it can assist in pushing to ensure that the unloading arm can be quickly extended. Through the arranged pushing frame 706, the rotating sleeve 7063 rolls during the process of pushing the unloading arm, ensuring that no large friction force is generated during the pushing process and guaranteeing the pushing effect.

[0036] When installing the pushing-out structure 7, the support base 702 is installed on the support plate 701, the electric push rod 703 penetrates through the support base 702, the positions of the two electric push rods 703 are adjusted so that the ends of the electric push rods 703 are aligned, and the electric push rods 703 are fixed with screws. In this way, the electric push rods 703 are fixed on the support plate 701 through the support base 702. The pushing-out frame 706 is installed at the end of the telescopic shaft 704, and the fixing seat 7061 in the pushing-out frame 706 is fixed at the end of the telescopic shaft 704. In this way, the installation of the entire pushing-out structure 7 is completed. When using the pushing-out structure 7, when the unloading arm is unfolded, the pushing-out structure 7 is started, the driving motor 705 runs to drive the telescopic shaft 704 on the electric push rod 703 to extend. The telescopic shaft 704 then drives the pushing-out frame 706 to move, so as to use the pushing-out frame 706 to assist in pushing the second rotating frame 4, ensuring that the entire unloading arm can be quickly unfolded. During the pushing process, as the second rotating frame 4 rotates, the relative position between the pushing-out frame 706 and the second rotating frame 4 changes. During this process, the rotating sleeve 7063 rotates on the round rod 7062, thereby reducing the friction force when the second rotating frame 4 and the pushing-out frame 706 move relatively, ensuring the pushing effect. The structure is simple and the use effect is excellent. After the unloading arm is unfolded, the electric push rod 703 runs to drive the telescopic shaft 704 to contract, and the pushing-out frame 706 returns to its original position.

[0037] The above content describes the usage principle, features and beneficial effects of the present invention. Those skilled in the art can understand from the above content that the above content does not limit the present invention. The above embodiments and descriptions in the specification describe the basic principles and features of the present invention. On the premise of conforming to the concept of the present invention, the present invention can also be variously changed and improved, and these improvements should fall within the scope of protection required by the present invention.

Claims

1. An LNG unloading arm structure, comprising a riser pipe (1), a connecting seat (2) is provided at the upper end of the riser pipe (1), and a first rotating frame (3) is installed on the connecting seat (2), the end of the first rotating frame (3) is connected to a second rotating frame (4), and an articulated unloading pipe (5) is provided on the first rotating frame (3) and the second rotating frame (4), characterized in that: A buffer structure (6) is installed on the riser pipe (1), and the buffer structure (6) includes a fixed plate (601), a mounting bracket (602), a movable rod (603), a spring (605) and a buffer contact member (606). The fixed plate (601) is fixed on the riser pipe (1). The mounting bracket (602) is sleeved on the riser pipe (1), and the mounting bracket (602) is installed on the fixed plate (601). The movable rod (603) is connected to the mounting bracket (602). The spring (605) is sleeved on the movable rod (603). The buffer contact member (606) is fixedly connected to the end of the movable rod (603). A pushing structure (7) is installed on the riser pipe (1), and the pushing structure (7) includes a support plate (701), an electric push rod (703), a telescopic shaft (704) and a pushing bracket (706). The support plate (701) is fixed on the riser pipe (1). The electric push rod (703) is installed on the support plate (701). The end of the telescopic shaft (704) is connected to the pushing bracket (706), and the telescopic shaft (704) is arranged on the electric push rod (703).

2. The structure of an LNG unloading arm according to claim 1, wherein: A bottom plate (8) is fixedly installed at the lower end of the riser pipe (1), and a reinforcing plate is provided between the bottom plate (8) and the riser pipe (1). The connection manner between the bottom plate (8) and the riser pipe (1) is welding, and a through hole is formed in the bottom plate (8).

3. The structure of an LNG unloading arm according to claim 2, characterized in that: A balance wheel (10) is provided on the first rotating bracket (3), and a balance steel cable is provided between the balance wheels (10). A rotary joint (11) is arranged at the end of the discharge pipe (5).

4. A structure of an LNG unloading arm according to claim 3, characterized in that: The pushing structure (7) is located above the buffer structure (6), and a counterweight (12) is arranged on the first rotating bracket (3).

5. A structure of an LNG unloading arm according to claim 4, characterized in that: The buffer structure (6) further includes a limit block (604). The fixed plate (601) is welded to the riser pipe (1). The mounting bracket (602) is fixedly connected to the fixed plate (601). The limit block (604) is fixed to the end of the movable rod (603) away from the buffer contact member (606). The ends of the spring (605) are respectively in contact with the mounting bracket (602) and the buffer contact member (606).

6. The structure of an LNG unloading arm according to claim 5, characterized in that: The mounting bracket (602) includes a first connecting sleeve (6021), a second connecting sleeve (6022), a first connecting plate (6023), a positioning hole (6024), a second connecting plate (6025), a positioning post (6026), a through hole (6027) and a mounting bolt (6028). The first connecting plate (6023) is fixed to the end of the first connecting sleeve (6021). The positioning hole (6024) is formed in the first connecting plate (6023). A fixed connection is provided between the second connecting plate (6025) and the positioning post (6026), and the second connecting plate (6025) is arranged at the end of the second connecting sleeve (6022). The positioning post (6026) passes through the positioning hole (6024) in the first connecting plate (6023). The through hole (6027) is formed in the first connecting plate (6023) and the second connecting plate (6025). The mounting bolt (6028) is arranged on the first connecting sleeve (6021) and the second connecting sleeve (6022), and the first connecting sleeve (6021) and the second connecting sleeve (6022) are sleeved on the riser pipe (1). The end of the mounting bolt (6028) is threadedly connected to the fixing plate (601). The first connecting sleeve (6021) and the second connecting sleeve (6022) are fixed to the fixing plate (601) by the mounting bolt (6028).

7. A structure of an LNG unloading arm according to claim 6, characterized in that: The buffer contact member (606) includes an assembly plate (6061), a spring piece (6062), a round block (6063), a threaded hole (6064) and a rubber pad (6065). A fixed connection is provided between the assembly plate (6061) and the spring piece (6062). The threaded hole (6064) is formed in the round block (6063), and the round block (6063) is fixedly installed on the assembly plate (6061). The round block (6063) is arranged at the corner position of the assembly plate (6061), and the round block (6063) is fixedly connected to the end of the movable rod (603) through the threaded hole (6064). The rubber pad (6065) is fixedly installed on the assembly plate (6061).

8. A structure of an LNG unloading arm according to claim 7, characterized in that: The pushing structure (7) further includes a support base (702) and a driving motor (705). The support base (702) is fixedly installed on the support plate (701), and the support plate (701) is welded to the riser pipe (1). The electric push rod (703) is installed on the support base (702). The driving motor (705) is arranged at the end of the electric push rod (703). The pushing frame (706) is fixed to the end of the telescopic shaft (704).

9. The structure of an LNG unloading arm according to claim 8, characterized in that: The pushing frame (706) includes a fixed seat (7061), a round rod (7062) and a rotating sleeve (7063). The round rod (7062) is installed between the fixed seats (7061), and the fixed seats (7061) are connected to the telescopic shaft (704). The rotating sleeve (7063) is installed on the round rod (7062), and a rotational connection is provided between the rotating sleeve (7063) and the round rod (7062).

10. A structure of an LNG unloading arm according to claim 9, characterized in that: An inspection window (9) for maintenance is provided on the riser pipe (1), and the number of the inspection windows (9) is two. A detachable toughened glass is provided in the inspection window (9).

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