Modularized offshore oil containment boom oil receiving system capable of being quickly assembled

Abstract

The invention discloses a modularized quickly-assembled offshore oil containment boom oil collecting system which comprises a bag body, a floating strip is fixedly arranged at the top in the bag body, a balance weight rod is fixedly connected to the bottom end of the bag body, buckling rings are fixedly connected to the two ends of the balance weight rod correspondingly, and a collecting shell is fixedly connected to one side of the top of the bag body; the bottom wall in the collecting shell is fixedly connected with a plurality of oil-water separation pipes, the bottom ends of the oil-water separation pipes are coaxially and fixedly connected with oil inlet pipes respectively, the oil inlet pipes are fixedly arranged at the bottom outside the collecting shell, the bottoms of the two ends of the collecting shell are fixedly connected with oil discharge connectors respectively, and the middle of the top end of the collecting shell is fixedly connected with an exhaust pipe; the two ends of the bag body are fixedly connected with fixing plates respectively, a plurality of round holes are formed in the fixing plates and the bag body, a connecting mechanism is fixedly connected in the round hole in one fixing plate, a supporting pipe is fixedly connected in the round hole in the other fixing plate in a sleeved mode, and the connecting mechanism is matched with the supporting pipe in an inserted mode.

Description

Technical Field

[0001] This invention relates to the field of marine oil boom technology, specifically a modular and rapidly assembleable marine oil boom oil recovery system. Background Technology

[0002] In an era of increasingly frequent global oil extraction and transportation, marine oil spills are becoming more frequent. Oil spills damage the ecological environment of the surrounding waters, potentially causing devastating harm. Oil booms are effective means of containing spilled oil at sea. An oil boom is a device that floats stably on the water's surface to prevent the spread of oil spills, reduce the spill area, remove oil and floating debris, and protect the aquatic environment. There are many types and forms of oil booms, but their basic structure consists of a float, skirt, tension bands, counterweights, and joints.

[0003] Existing oil booms are all manufactured in rolls, typically 200 meters per roll. Once a section of the boom breaks, the entire roll becomes unusable. The use, maintenance, and replacement costs of offshore oil booms are high. Furthermore, in emergency oil spills, deploying roll-mounted booms is time-consuming, making it difficult to quickly form an effective containment area, increasing the risk of oil spill spread. Simultaneously, traditional oil booms have limited functionality, primarily focusing on containment. For contained oil spills, additional oil recovery equipment is required, resulting in low overall operational efficiency and failing to meet the demands for rapid response and efficient handling. Moreover, the complex and variable sea conditions in different areas mean that the fixed structure of traditional oil booms makes it difficult to flexibly adjust the containment range according to the actual spill area, current speed, and other factors, resulting in poor adaptability. Therefore, we propose a modular, rapidly assembleable offshore oil boom oil recovery system to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide a modular, rapidly assembleable offshore oil boom system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a modular and rapidly assembleable offshore oil boom recovery system, comprising a bag body, a float fixedly disposed at the top of the bag body, a counterweight rod fixedly connected to the bottom of the bag body, fastening rings fixedly connected to both ends of the counterweight rod, a collection shell fixedly connected to one side of the top of the bag body, a plurality of oil-water separation pipes fixedly connected to the bottom wall of the collection shell, an oil inlet pipe fixedly connected to the bottom of each oil-water separation pipe, the oil inlet pipes being fixedly disposed at the bottom outside the collection shell, an oil drain connector fixedly connected to the bottom of both ends of the collection shell, and an exhaust pipe fixedly connected to the middle of the top of the collection shell; The two ends of the bag are fixedly connected to a fixing plate. Both the fixing plate and the bag have multiple round holes. A connecting mechanism is fixedly connected in one of the round holes on the fixing plate, and a support tube is fixedly sleeved in the round hole on the other fixing plate. The connecting mechanism and the support tube are inserted into each other.

[0006] Preferably, the end of the exhaust pipe furthest from the collection housing faces downward and is connected to the atmosphere.

[0007] Preferably, the fixing plate has a U-shaped structure.

[0008] Preferably, the oil inlet pipe has multiple through holes on its circumference, and the through holes are evenly distributed around the circumference.

[0009] Preferably, the height of the oil-water separation pipe is less than the depth of the collection shell, and the oil-water separation pipe is evenly distributed along the length of the collection shell.

[0010] Preferably, the connecting mechanism includes a plug rod, a conical groove, a metal ball, a positioning post, a connecting rod, a return spring, an operating cap, and an adjusting assembly. The plug rod is fixedly installed in a circular hole in a fixed plate. An adjusting assembly is fixedly sleeved on one outer wall of the plug rod. Multiple conical grooves are provided on the other side of the plug rod. Metal balls are slidably arranged in the conical grooves. The metal balls slidably abut against the positioning post. The positioning post is slidably sleeved in the plug rod. One end of the positioning post is coaxially fixedly connected to one end of the connecting rod. The other end of the connecting rod is coaxially fixedly connected to the operating cap. The operating cap is slidably sleeved on the end of the plug rod away from the conical groove. A return spring is movably sleeved on the outside of the connecting rod. The return spring is movably arranged in the plug rod and one end is fixedly connected to the operating cap.

[0011] Preferably, one end of the plug rod is hollow and has a cylindrical cavity, the positioning pin is slidably sleeved in the cylindrical cavity, the other end of the plug rod has a movable groove, the return spring is movably disposed in the movable groove and the end of the return spring away from the operating cap is fixedly connected to the inner wall of the movable groove, one end of the movable groove is slidably engaged with the operating cap, a central chamber is formed between the cylindrical cavity and the movable groove, and the connecting rod is slidably sleeved in the central chamber.

[0012] Preferably, the outer wall of the middle part of the positioning post is recessed with an annular groove, and the annular groove is fitted into the metal ball.

[0013] Preferably, the adjusting assembly includes an external threaded tube, an adjusting nut, and an adjusting ring. The external threaded tube is fixedly sleeved on the outer wall of the end of the plug rod away from the tapered groove. An adjusting nut is sleeved on one side of the external threaded tube through a threaded structure, and an adjusting ring is sleeved on the other side of the external threaded tube through a threaded structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The modular design of this invention allows each bag to function as an independent functional unit, and the number of bags that can be assembled can be flexibly selected according to the actual oil spill area, sea conditions and other requirements, so as to achieve precise adjustment of the containment range; when a module is damaged, only the corresponding bag needs to be replaced, without the need for the whole bag to be scrapped, which greatly reduces the cost of use, maintenance and replacement. 2. In the event of an emergency oil spill, each module can be quickly transported to the site. Through the connection mechanism and the plug-in cooperation with the support pipe, it can be quickly assembled and put into use, effectively shortening the time for the containment area to form and significantly reducing the risk of oil spill spread. 3. During the oil containment operation, oil and seawater in the seawater enter the oil-water separator pipe together through the oil inlet pipe. The oil, which has a lower density, is at the top of the oil-water separator pipe, while the water, which has a higher density, is at the bottom. According to the principle of communicating vessels, the internal and external pressures are the same. However, due to the oil layer, the internal height is slightly higher than the external sea surface. After the oil accumulates to the top, it flows out from the top of the oil-water separator pipe and is stored in the collection shell. The water at the bottom, which is lower than the height of the oil-water separator pipe, is retained in the oil-water separator pipe, thus achieving the purpose of oil-water separation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Rear structure diagram; Figure 3 For the present invention Figure 1 Schematic diagram of the structure from an upward perspective; Figure 4 This is a partial cross-sectional view of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram of the combined structure of the oil containment boom of the present invention.

[0016] In the diagram: 1. Bag body; 2. Float bar; 3. Collection shell; 4. Oil inlet pipe; 41. Through hole; 5. Oil drain connector; 6. Exhaust pipe; 7. Fixing plate; 8. Connecting mechanism; 81. Insert rod; 81. Central chamber; 811. Cylindrical cavity; 812. Movable groove; 813. Conical groove; 82. Metal ball; 83. Positioning post; 84. Annular groove; 841. Connecting rod; 85. Return spring; 86. Operating cap; 87. Adjustment assembly; 88. External threaded pipe; 881. Adjusting nut; 882. Adjusting ring; 883. Support pipe; 9. Counterweight rod; 10. Fastening ring; 11. Oil-water separator pipe; 12. Round hole; 13. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 Reference Figure 1 , 2 This is the first embodiment of the present invention. This embodiment provides a modular and quick-assembly marine oil boom collection system, including a bag body 1. A float 2 is fixedly installed at the top of the bag body 1. A counterweight rod 10 is fixedly connected to the bottom of the bag body 1. Fastening rings 11 are fixedly connected to both ends of the counterweight rod 10. A collection shell 3 is fixedly connected to one side of the top of the bag body 1. Multiple oil-water separation pipes 12 are fixedly connected to the bottom wall inside the collection shell 3. An oil inlet pipe 4 is fixedly connected to the bottom of the oil-water separation pipes 12 on the same axis. The oil inlet pipe 4 is fixedly installed at the bottom outside the collection shell 3. An oil drain connector 5 is fixedly connected to the bottom of both ends of the collection shell 3. An exhaust pipe 6 is fixedly connected to the middle of the top of the collection shell 3. Fixed plates 7 are fixedly connected to both ends of the bag body 1. Multiple round holes 13 are provided on both the fixed plates 7 and the bag body 1. A connecting mechanism 8 is fixedly connected in the round hole 13 on one fixed plate 7, and a support tube 9 is fixedly sleeved in the round hole 13 on the other fixed plate 7. The connecting mechanism 8 and the support tube 9 are inserted and matched.

[0019] Example 2 Reference Figure 1-6 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment. Specifically, the end of the exhaust pipe 6 away from the collection shell 3 is oriented downward and connected to the atmosphere. The exhaust pipe 6 is used to release excess gas inside the collection shell 3 to achieve a balance between internal and external pressures and avoid the oil collection effect being affected by excessive internal air pressure. At the same time, the downward-oriented design of the pipe opening can effectively prevent seawater backflow.

[0020] Specifically, the fixing plate 7 has a U-shaped structure. This structural design ensures connection stability while reducing the overall weight of the fixing plate 7 and facilitates fixed connection with the end of the bag body 1, forming a stable connection base.

[0021] Specifically, the oil inlet pipe 4 has multiple through holes 41 on its periphery. The through holes 41 are evenly distributed around the circumference. The multiple circumferentially distributed through holes 41 can increase the oil inlet area, so that the surrounding spilled oil and seawater mixture can enter the oil inlet pipe 4 more evenly and efficiently, thereby improving the efficiency of oil and water collection.

[0022] Specifically, the height of the oil-water separation pipe 12 is less than the depth of the collection shell 3. The oil-water separation pipe 12 is evenly distributed along the length of the collection shell 3. This design allows the oil flowing out from the top of the oil-water separation pipe 12 to enter the collection shell 3 smoothly for collection without overflowing. The oil-water separation pipe 12, which is evenly distributed along the length, can ensure that the oil spillage within the coverage area of ​​the collection shell 3 is treated comprehensively and evenly.

[0023] Specifically, the connecting mechanism 8 includes a plug rod 81, a conical groove 82, a metal ball 83, a positioning post 84, a connecting rod 85, a return spring 86, an operating cap 87, and an adjusting assembly 88. The plug rod 81 is fixedly installed in a circular hole 13 in a fixed plate 7. The adjusting assembly 88 is fixedly sleeved on one side of the outer wall of the plug rod 81. Multiple conical grooves 82 are opened on the other side of the plug rod 81. Metal balls 83 are slidably arranged in the conical grooves 82. The metal balls 83 slidably abut against the positioning post 84. The positioning post 84 is slidably sleeved in the plug rod 81. One end of the positioning post 84 is coaxially fixedly connected to one end of the connecting rod 85. The other end of the connecting rod 85 is coaxially fixedly connected to the operating cap 87. The operating cap 87 is slidably sleeved on the end of the plug rod 81 away from the conical groove 82. A return spring 86 is movably sleeved on the outside of the connecting rod 85. The return spring 86 is movably arranged in the plug rod 81 and one end is fixedly connected to the operating cap 87.

[0024] When connecting two modules, manually push the operating cap 87. The operating cap 87 drives the connecting rod 85 to slide into the insertion rod 81. The connecting rod 85 then drives the positioning post 84 to slide within the cylindrical cavity 812. At this time, the return spring 86 is compressed, and the annular groove 841 on the positioning post 84 moves accordingly, causing the metal ball 83 to lose its clamping force and retract into the annular groove 841, releasing the restriction on the metal ball 83. Align the insertion rod 81 of one module with the support tube 9 of the other module, and push the insertion rod 81 into the support tube 9. When the insertion... After rod 81 is inserted into place, the positioning post 84 moves back under the reset action of return spring 86. The metal ball 83 protrudes from the conical groove 82 under the abutment of positioning post 84 and is stuck into the outer wall of one end of support tube 9, thus achieving a stable connection between the insertion rod 81 and support tube 9. When disassembly is required, pull the operating cap 87, which drives the positioning post 84 to move through connecting rod 85, so that the positioning post 84 no longer presses against the metal ball 83. The metal ball 83 can retract into the conical groove 82 into the annular groove 841, and the insertion rod 81 can be pulled out from the support tube 9. The operation is convenient and quick.

[0025] Furthermore, one end of the plug-in rod 81 is hollow and has a cylindrical cavity 812. The positioning post 84 is slidably sleeved in the cylindrical cavity 812, providing a stable guide for the sliding of the positioning post 84 and ensuring its accurate movement trajectory. The other end of the plug-in rod 81 has a movable groove 813. The return spring 86 is movably disposed in the movable groove 813, and the end of the return spring 86 away from the operating cap 87 is fixedly connected to the inner wall of the movable groove 813. The movable groove 813 provides installation space and extension space for the return spring 86. This ensures that the return spring 86 can stably perform its reset function. One end of the movable groove 813 is slidably engaged with the operating cap 87 to prevent the operating cap 87 from falling off the plug rod 81, while not affecting the sliding operation of the operating cap 87. A central chamber 811 is provided between the cylindrical cavity 812 and the movable groove 813. The connecting rod 85 is slidably sleeved in the central chamber 811. The central chamber 811 guides and limits the movement of the connecting rod 85, ensuring that the connecting rod 85 can drive the positioning column 84 to move smoothly.

[0026] Furthermore, the outer wall of the positioning post 84 is recessed in the middle and has an annular groove 841. The annular groove 841 and the metal ball 83 are fitted together, and at least two metal balls 83 are evenly distributed around the circumference. When the positioning post 84 moves to a specific position, the metal ball 83 can be partially embedded in the annular groove 841. At this time, the metal ball 83 is retracted into the conical groove 82, which facilitates the insertion of the connector rod 81 into or out of the support tube 9, and avoids the metal ball 83 affecting the insertion of the connector rod 81. When the positioning post 84 moves back under the action of the return spring 86, the annular groove 841 disengages from the metal ball 83, and the outer wall of the positioning post 84 presses against the metal ball 83, so that the metal ball 83 protrudes from the conical groove 82 to achieve fixation. This structural design further improves the reliability and convenience of connection and disassembly.

[0027] Furthermore, the adjusting assembly 88 includes an externally threaded tube 881, an adjusting nut 882, and an adjusting ring 883. The externally threaded tube 881 is fixedly sleeved on the outer wall of the end of the insertion rod 81 away from the tapered groove 82. The adjusting nut 882 is threaded onto one side of the externally threaded tube 881, and the adjusting ring 883 is threaded onto the other side of the externally threaded tube 881. By rotating the adjusting nut 882 and the adjusting ring 883, their positions on both sides of the fixing plate 7 can be adjusted, thereby firmly clamping the insertion rod 81 in the circular hole 13 of the fixing plate 7, preventing the insertion rod 81 from loosening or shifting during use, ensuring the overall stability of the connecting mechanism 8, and also facilitating adaptive fine-tuning according to the different thicknesses of the fixing plate 7.

[0028] The working principle and process are as follows: In use, multiple bags 1 are first transported to the oil spill site. The required number of bags 1 is determined based on the spill area. Then, the modules are assembled. During assembly, the connecting mechanism 8 on the end fixing plate 7 of one bag 1 is aligned with the support tube 9 on the end fixing plate 7 of another bag 1. The operating cap 87 is manually pushed, causing the connecting rod 85 to slide into the insertion rod 81. The connecting rod 85 then drives the positioning post 84 to slide within the cylindrical cavity 812. At this time, the return spring 86 is compressed, and the annular groove 841 on the positioning post 84 moves accordingly, causing the metal ball 83 to lose its clamping force and retract into the annular groove 841, releasing the restriction on the metal ball 83. Then, the insertion rod 81 is inserted into the support tube 9. Inside, the operating cap 87 is released. Under the reset action of the return spring 86, the operating cap 87 drives the connecting rod 85 and the positioning post 84 to slide in opposite directions. The outer wall of the positioning post 84 pushes the metal ball 83 to move outward along the conical groove 82 until the metal ball 83 partially protrudes from the outer wall of the insertion rod 81 and abuts against the end edge of the support tube 9, thus achieving the initial connection of the two bag bodies 1. Subsequently, the tightness of the connection is adjusted by adjusting the pitch assembly 88. The adjusting nut 882 and adjusting ring 883 are manually rotated to move on the external threaded tube 881 until the adjusting nut 882 abuts against the outer wall of the fixing plate 7, while the adjusting ring 883 limits the adjusting nut 882, thus achieving fine adjustment of the connection tightness and ensuring a stable connection between the connecting mechanism 8 and the support tube 9. To prevent loosening under the influence of ocean currents, after multiple bags 1 are assembled in sequence using the above method, the buckle rings 11 at both ends of the bottom counterweight rod 10 of each bag 1 are fastened together, so that the oil boom system floats stably on the sea surface. The bags 1 unfold under the buoyancy of the floats 2, forming a containment area for the oil spill. After the oil spill is contained, under the action of seawater flow and pressure, the oily seawater enters the oil inlet pipe 4 through the through holes 41 on the periphery of the oil inlet pipe 4, and then flows into the oil-water separator 12. In the oil-water separator 12, the oil density is lower at the top and the water density is higher at the bottom. According to the principle of communicating vessels, the internal and external pressures are the same, but due to the oil layer, the internal height is slightly higher than the external sea surface. After the oil accumulates to the top, it flows out from the top of the oil-water separator 12 and is stored in the... In the collection shell 3, the water level at the bottom is less than the height of the oil-water separation pipe 12 and will remain at the bottom of the oil-water separation pipe 12, thereby achieving the purpose of oil-water separation. Each collection shell 3 can be connected in series or parallel with the pipeline through the oil drain connector 5. Finally, the pipeline is connected to the external oil transportation equipment to recover the oil in the collection shell 3. The gas in the collection shell 3 is discharged through the exhaust pipe 6 to make the internal and external pressure equal. The exhaust pipe 6 is set with the pipe opening facing downwards to effectively prevent seawater backflow. When a section of the bag 1 is damaged, it is only necessary to operate the connecting mechanism 8 again to separate the connecting mechanism 8 at both ends of the damaged bag 1 from the support pipe 9 of the adjacent bag 1. After replacing the new bag 1, it can be reassembled without replacing the whole bag, which greatly reduces maintenance costs and operation time.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular, rapidly assembleable offshore oil boom system, comprising a bag body (1), characterized in that: A floating strip (2) is fixedly arranged at the top inside the bag body (1). The bottom end of the bag body (1) is fixedly connected with a counterweight rod (10). Both ends of the counterweight rod (10) are respectively fixedly connected with a buckling ring (11). One side of the top of the bag body (1) is fixedly connected with a collection housing (3). A plurality of oil-water separation tubes (12) are fixedly connected to the bottom wall inside the collection housing (3). The bottom ends of the oil-water separation tubes (12) are respectively coaxially fixedly connected with an oil inlet pipe (4). The oil inlet pipe (4) is fixedly arranged at the bottom outside the collection housing (3). Oil drain connectors (5) are respectively fixedly connected to the bottom parts at both ends of the collection housing (3). An exhaust pipe (6) is fixedly connected to the middle part of the top end of the collection housing (3). Fixing plates (7) are respectively fixedly connected to both ends of the bag body (1). A plurality of round holes (13) are formed in both the fixing plates (7) and the bag body (1). A connecting mechanism (8) is fixedly connected to a round hole (13) in one of the fixing plates (7). A support tube (9) is fixedly sleeved in a round hole (13) in the other fixing plate (7). The connecting mechanism (8) and the support tube (9) are in plug-in fit with each other.

2. The modular, rapidly assembleable offshore oil boom recovery system according to claim 1, characterized in that: One end of the exhaust pipe (6) away from the collection housing (3) has its pipe orifice facing downward and is connected to the atmosphere.

3. The modular, rapidly assembleable offshore oil boom recovery system according to claim 1, characterized in that: The fixing plate (7) is of a U-shaped structure.

4. The modular, rapidly assembleable offshore oil boom recovery system according to claim 1, characterized in that: A plurality of through holes (41) are formed in the circumferential side of the oil inlet pipe (4), and the through holes (41) are arranged in a circumferentially uniform manner.

5. A modular, rapidly assembleable offshore oil boom recovery system according to claim 1, characterized in that: The height of the oil-water separation tube (12) is less than the depth of the collection housing (3), and the oil-water separation tubes (12) are arranged in a uniform manner along the length direction of the collection housing (3).

6. A modular, rapidly assembleable offshore oil boom recovery system according to claim 1, characterized in that: The connecting mechanism (8) includes a plugging rod (81), a tapered groove (82), a metal sphere (83), a positioning column (84), a connecting rod (85), a return spring (86), an operation cap (87), and an adjustable distance component (88). The plugging rod (8) is fixedly installed in a round hole (13) formed in one of the fixing plates (7). An adjustable distance component (88) is fixedly sleeved on the outer wall of one side of the plugging rod (81). A plurality of tapered grooves (82) are formed in the other side of the plugging rod (81). Metal spheres (83) are respectively arranged to slide in the tapered grooves (82). The metal spheres (83) are in sliding contact with a positioning column (84). The positioning column (84) is slidably sleeved in the plugging rod (81). One end of the positioning column (84) is coaxially fixedly connected to one end of the connecting rod (85). The other end of the connecting rod (85) is coaxially fixedly connected to the operation cap (87). The operation cap (87) is slidably sleeved on the end of the plugging rod (81) away from the tapered groove (82). A return spring (86) is movably sleeved on the connecting rod (85), and the return spring (86) is movably arranged in the plugging rod (81) and one end of it is fixedly connected to the operation cap (87).

7. A modular, rapidly assembleable offshore oil boom recovery system according to claim 6, characterized in that: One end of the plug rod (81) is hollow and has a cylindrical cavity (812). The positioning post (84) is slidably sleeved in the cylindrical cavity (812). The other end of the plug rod (81) has a movable groove (813). The return spring (86) is movably disposed in the movable groove (813), and the end of the return spring (86) away from the operating cap (87) is fixedly connected to the inner wall of the movable groove (813). One end of the movable groove (813) is slidably engaged with the operating cap (87). A central chamber (811) is provided between the cylindrical cavity (812) and the movable groove (813). The connecting rod (85) is slidably sleeved in the central chamber (811).

8. A modular, rapidly assembleable offshore oil boom recovery system according to claim 6, characterized in that: The positioning post (84) has an annular groove (841) recessed in the outer wall of its middle part, and the annular groove (841) and the metal ball (83) are fitted together.

9. A modular, rapidly assembleable offshore oil boom recovery system according to claim 6, characterized in that: The adjusting assembly (88) includes an external threaded tube (881), an adjusting nut (882), and an adjusting ring (883). The external threaded tube (881) is fixedly sleeved on the outer wall of the end of the plug rod (81) away from the tapered groove (82). The adjusting nut (882) is sleeved on one side of the external threaded tube (881) through a threaded structure, and the adjusting ring (883) is sleeved on the other side of the external threaded tube (881) through a threaded structure.

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