Disassembling and assembling tool for hydraulic oil cylinder of inner arm of unloading arm for LNG (Liquefied Natural Gas) ship

Abstract

The utility model discloses an LNG (liquefied natural gas) ship unloading arm inner arm hydraulic oil cylinder dismounting tool which comprises a supporting seat, a slewing bearing, a slewing platform and a hoisting mechanism, the slewing bearing is arranged in the middle of the upper surface of the supporting seat, the slewing platform is arranged above the slewing bearing, and the hoisting mechanism is arranged on the slewing platform. The rotary platform drives the hoisting mechanism to rotate in the horizontal plane, the hoisting mechanism can hoist the inner arm hydraulic oil cylinder, the inner arm hydraulic oil cylinder can be detached independently, and the occupied space is small; the use of a crane ship and a transport ship is avoided, the occupation of a berthing water area of the LNG ship is avoided, the disassembly of the whole unloading arm is avoided, the workload, the working hours and the maintenance cost are effectively reduced, and the unloading arm is safe, reliable and economical.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder disassembly technology for LNG ship unloading arm, and in particular to a tooling for disassembling and assembling the hydraulic cylinder of the inner arm of an LNG ship unloading arm. Background Technology

[0002] The LNG carrier unloading boom is installed at the LNG receiving terminal's dock, its function being to transfer LNG from the LNG carrier to storage tanks at the land-based LNG receiving terminal. The boom's movement is primarily driven by a hydraulic system, with the inner boom drive hydraulic cylinder playing a crucial role. When the hydraulic cylinder experiences hydraulic oil leakage or reaches the end of its service life, it needs to be disassembled and repaired. The inner boom drive hydraulic cylinder is mounted on a column and bolted to the boom's steel structure. It is approximately 20 meters high and weighs about 1.1 tons. Due to limited dock space and the limited load-bearing capacity of the trestle, conventional truck cranes cannot access the site, making disassembly and repair difficult.

[0003] The traditional method for overhauling the inner boom drive hydraulic cylinder involves erecting full-span scaffolding at the unloading boom, dismantling all hydraulic pipelines and control cables related to the unloading boom, and then securing the fixing points of the outer and inner booms with bolts. The crane vessel and transport vessel are then guided into the berthing area of ​​the dock for positioning and adjustment. Workers climb the scaffolding to install lifting wire ropes at each lifting point of the unloading boom, attaching the other end of the wire rope to the crane vessel's hook. The scaffolding is then dismantled to avoid interfering with the lifting operation. After dismantling, the anchor bolts of the unloading boom columns and the flange bolts of the unloading pipes are removed. The entire unloading boom is then lifted out by the crane vessel, placed on a transport vessel, and transported to the manufacturer's specialized maintenance workshop for disassembly and repair. This disassembly / reassembly, disassembly and repair, and round-trip transportation process takes approximately several tens of days. The aforementioned traditional maintenance methods require the use of crane vessels and transport ships to operate in the berthing waters. The entire dismantling and reloading process occupies the LNG carrier's berthing waters for approximately six days. During this period, the LNG carrier cannot enter the berthing terminal, and all unloading arms cannot unload. For LNG receiving terminals, the inability to unload can lead to insufficient tank storage and production shutdowns, affecting the continuous supply of natural gas downstream. Furthermore, these traditional maintenance methods require leasing crane vessels and transport ships, and the entire unloading arm must be returned to the factory for maintenance, incurring high costs for vessel leasing, transportation, and return-to-factory repair services. Therefore, traditional maintenance methods are unacceptable both economically and in terms of production efficiency. Utility Model Content

[0004] The purpose of this application is to provide a tooling for disassembling and assembling the hydraulic cylinder of the inner arm of an LNG ship unloading arm, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A tooling for disassembling and assembling the hydraulic cylinder of the inner arm of an LNG ship unloading arm includes a support base, a slewing bearing, a slewing platform, and a lifting mechanism. The slewing bearing is located in the middle of the upper surface of the support base, the slewing platform is located above the slewing bearing, and the lifting mechanism is located on the slewing platform.

[0007] Optionally, the lifting mechanism includes a boom, a winch, and a lifting cylinder. The lower end of the boom is hinged to the slewing platform, and the upper end of the boom is provided with a pulley block. The winch is located on one side of the boom on the slewing platform, and a traction rope is wound on the winch. The traction rope passes around the pulley block and is connected to the hook. The lifting cylinder is located on the side of the boom away from the winch. The fixed end of the lifting cylinder is hinged to the slewing platform, and the moving end of the lifting cylinder is hinged to the boom.

[0008] Optionally, the pulley block includes a first pulley, a second pulley, a third pulley, and a fourth pulley. The first pulley is located on the side of the boom near the winch, the second pulley is located on the top surface of the boom, the third pulley and the fourth pulley are respectively located on the side of the boom away from the winch, and the fourth pulley is located below the third pulley. The traction rope passes around the outside of the first pulley, the second pulley, and the third pulley, then passes through the upper end of the hook, and from the side of the fourth pulley near the winch, it winds around to the other side of the fourth pulley and connects downwards to the hook.

[0009] Optionally, the support base includes a base and legs. The upper surface edge of the base is connected to the lower ends of the four legs. The upper ends of the legs are provided with mounting rods extending inward. The mounting rods are provided with mounting platforms for mounting the slewing bearing.

[0010] Optionally, the support base further includes a reinforcing rod, which is inclinedly disposed on the inner side of the support leg, and the two ends of the reinforcing rod are respectively connected to the support leg and the mounting rod.

[0011] Optionally, the base is circular.

[0012] In summary, the technical effects and advantages of this utility model are as follows: The rotating platform of this utility model drives the lifting mechanism to rotate in the horizontal plane. The lifting mechanism can lift the inner arm hydraulic cylinder and can realize the individual disassembly of the inner arm hydraulic cylinder, which occupies little space; it avoids the use of crane ships and transport ships, avoids occupying the berthing water of LNG ships, and avoids the disassembly of the entire unloading arm, effectively reducing workload, working hours and maintenance costs, and is safe, reliable and economical. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the disassembly and assembly tooling for the hydraulic cylinder of the inner arm of the LNG ship unloading arm in one embodiment of the present invention.

[0015] Figure 2 This is a top view of the support base in one embodiment of the present invention;

[0016] Figure 3 This is a right view of the support base in one embodiment of the present invention.

[0017] The components are as follows: 01. Inner boom hydraulic cylinder; 1. Slewing bearing; 2. Slewing platform; 3. Boom; 4. Winch; 5. Lifting cylinder; 6. Traction rope; 7. Hook; 8. First pulley; 9. Second pulley; 10. Third pulley; 11. Fourth pulley; 12. Base; 13. Outrigger; 14. Mounting rod; 15. Mounting platform; 16. Reinforcing rod. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] The main purpose of this embodiment is to solve the problem of long maintenance cycles, high maintenance costs, and disruption to normal production operations caused by the difficulty of disassembling the hydraulic cylinder of the inner arm of the unloading arm separately. This embodiment proposes a disassembly and assembly tooling for the hydraulic cylinder of the inner arm of the LNG ship unloading arm, which adopts a split assembly design, such as... Figures 1-3 As shown, the fixture includes a support base, a slewing bearing 1, a slewing platform 2, and a lifting mechanism. The slewing bearing 1 is located in the middle of the upper surface of the support base, and the slewing platform 2 is located above the slewing bearing 1. The lifting mechanism is mounted on the slewing platform 2. The slewing platform 2 and the lifting mechanism can rotate in the horizontal plane relative to the support base, facilitating the movement of the inner arm hydraulic cylinder 01 onto the dock. The fixture has a small overall footprint, solving the problem of limited dock space.

[0021] Optionally, the lifting mechanism includes a boom 3, a winch 4, and a lifting cylinder 5. The lower end of the boom 3 is hinged to the rotary platform 2, and the upper end of the boom 3 is provided with a pulley block. The winch 4 is located on one side of the boom 3 on the rotary platform 2, and a traction rope 6 is wound on the winch 4. The traction rope 6 passes around the pulley block and is connected to a hook 7. The lifting cylinder 5 is located on the side of the boom 3 away from the winch 4. The fixed end of the lifting cylinder 5 is hinged to the rotary platform 2, and the moving end of the lifting cylinder 5 is hinged to the boom 3. In this embodiment, the traction rope 6 is a steel wire rope.

[0022] Optionally, the pulley block includes a first pulley 8, a second pulley 9, a third pulley 10, and a fourth pulley 11. The first pulley 8 is located on the side of the boom 3 near the winch 4. The second pulley 9 is located on the top surface of the boom 3. The third pulley 10 and the fourth pulley 11 are respectively located on the side of the boom 3 away from the winch 4. The fourth pulley 11 is located below the third pulley 10. The traction rope 6 passes around the outside of the first pulley 8, the second pulley 9, and the third pulley 10, then passes through the upper end of the hook 7, and from the side of the fourth pulley 11 near the winch 4, it winds down to the other side of the fourth pulley 11 and connects to the hook 7. The winch 4 can be a manual winch or an electric winch; in this embodiment, the winch 4 is a manual winch. The winch 4 drives the hook 7 to move up and down via the traction rope 6. The hook 7 is connected to the inner boom hydraulic cylinder via a sling. The lifting cylinder 5 drives the boom 3 to rotate, adjusting the position of the boom 3.

[0023] Optionally, the support includes a base 12 and legs 13. The upper surface edge of the base 12 is connected to the lower ends of the four legs 13. The upper ends of the legs 13 are provided with inwardly extending mounting rods 14. Mounting platforms 15 are provided on the mounting rods 14 for mounting the slewing bearing 1. The legs 13 and mounting rods 14 form a frame structure, effectively reducing weight while ensuring overall strength. The mounting platforms 15 are connected to the slewing bearing 1 by bolts. Optionally, the base 12 is circular.

[0024] Optionally, the support base further includes a reinforcing rod 16, which is inclinedly disposed on the inner side of the support leg 13. The two ends of the reinforcing rod 16 are respectively connected to the support leg 13 and the mounting rod 14. The reinforcing rod 16, the support leg 13, and the mounting rod 14 form a triangular structure, which increases the overall structural strength.

[0025] The working process of this embodiment:

[0026] 1. First, remove the fixing bolts at the bottom of the inner arm hydraulic cylinder.

[0027] 2. Use the pulley block hook 7 to connect it to the inner arm hydraulic cylinder 01 via the sling.

[0028] 3. With the help of the pulley block, the manual winch 4 only requires a force of about 3.7KN to lift a hydraulic cylinder weighing about 1.1 tons.

[0029] 4. The hydraulic cylinder is rotated 180° by the rotating platform 2.

[0030] In summary, this embodiment enables the individual disassembly of the inner arm hydraulic cylinder. No crane vessels or transport ships are used during the entire overhaul period, avoiding the occupation of the LNG carrier's berthing area and ensuring the normal operation of other unloading arms. This allows for timely replenishment of tank storage, guaranteeing continuous and stable production. Furthermore, it avoids the disassembly of the entire unloading arm, effectively reducing workload, time, and maintenance costs. This embodiment can be used for the overhaul of the inner arm hydraulic cylinder of an LNG carrier unloading arm, or for the overhaul of the inner arm hydraulic cylinder of a similar unloading arm.

[0031] For ease of explanation, spatial relative terms such as "upper," "lower," "outer," and "inner" are used in the embodiments to describe the relationship of one element or feature relative to another element or feature shown in the figures. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device during use or operation. Therefore, the exemplary term "lower" can encompass both upper and lower orientations.

[0032] Moreover, relational terms such as “3” and “4” are merely used to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0033] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not limiting. Those skilled in the art can make many specific modifications under the guidance of the present invention without departing from the spirit and scope of the claims, and these modifications all fall within the scope of protection of the present invention.

Claims

1. An LNG ship unloading arm inner arm hydraulic oil cylinder disassembly and assembly tool, characterized in that, Including support seat, slewing bearing, slewing platform and hoisting mechanism, the upper surface of the support seat is provided with the slewing bearing in the middle, the slewing bearing is provided with the slewing platform above, and the hoisting mechanism is arranged on the slewing platform.

2. The LNG ship unloading arm inner arm hydraulic oil cylinder dismounting tool according to claim 1, characterized in that, The hoisting mechanism includes a boom, a winch and a lifting oil cylinder, the lower end of the boom is hinged to the slewing platform, the upper end of the boom is provided with a pulley block, the slewing platform is provided with the winch on one side of the boom, the winch is wound with a traction rope, the traction rope is connected with a hook after passing through the pulley block, the lifting oil cylinder is arranged on the side of the boom away from the winch, the fixed end of the lifting oil cylinder is hinged to the slewing platform, and the moving end of the lifting oil cylinder is hinged to the boom.

3. The LNG ship unloading arm inner arm hydraulic oil cylinder dismounting tool according to claim 2, characterized in that, The pulley block includes a first pulley, a second pulley, a third pulley and a fourth pulley, the first pulley is arranged on the side of the boom close to the winch, the second pulley is arranged on the top end surface of the boom, the third pulley and the fourth pulley are arranged on the side of the boom away from the winch respectively, the fourth pulley is below the third pulley, the traction rope passes through the outer side of the first pulley, the second pulley and the third pulley, then passes through the upper end of the hook, and is connected with the hook downward from the other side of the fourth pulley close to the winch to the side of the fourth pulley away from the winch.

4. The LNG ship unloading arm inner arm hydraulic oil cylinder dismounting tool according to claim 1, characterized in that, The support seat includes a base and a support leg, the upper surface edge of the base is connected with the lower end of the four support legs, the upper end of the support leg is provided with an inwardly extending mounting rod, and the mounting platform is arranged on the mounting rod.

5. The LNG ship unloading arm inner arm hydraulic oil cylinder dismounting tool according to claim 4, characterized in that, The support seat further includes a reinforcing rod, the reinforcing rod is arranged on the inner side of the support leg, and the two ends of the reinforcing rod are connected with the support leg and the mounting rod respectively.

6. The LNG ship unloading arm inner arm hydraulic oil cylinder dismounting tool according to claim 4, characterized in that, The base is circular.

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