CN117685496A - LNG marine arm of unloading - Google Patents

LNG marine arm of unloading Download PDF

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Publication number
CN117685496A
CN117685496A CN202311752141.4A CN202311752141A CN117685496A CN 117685496 A CN117685496 A CN 117685496A CN 202311752141 A CN202311752141 A CN 202311752141A CN 117685496 A CN117685496 A CN 117685496A
Authority
CN
China
Prior art keywords
arm
support
main frame
outer arm
inner arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311752141.4A
Other languages
Chinese (zh)
Inventor
孟凡皓
沈阳
胡旭杰
苗增
于波
李同旺
顾杰岩
刘聪
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Jari Automation Co ltd China
Original Assignee
Jari Automation Co ltd China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jari Automation Co ltd China filed Critical Jari Automation Co ltd China
Priority to CN202311752141.4A priority Critical patent/CN117685496A/en
Publication of CN117685496A publication Critical patent/CN117685496A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/086—Pipe-line systems for liquids or viscous products for explosives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Abstract

The invention discloses a discharging arm for an LNG ship, which is characterized in that a pipeline system is connected with a main pipeline for conveying LNG on the ship through a rotary joint, and is supported on an inner arm parallelogram support driving system and an outer arm parallelogram support driving system, and an integral rotation driving device is used for connecting a mounting base with a discharging arm main body of the LNG ship through a rotation support and driving the main body to rotate through a hydraulic motor. The inner arm parallelogram support driving system and the outer arm parallelogram support driving system are driven to rotate through the splayed oil cylinder group and drive the pipeline system to synchronously move; the LNG ship unloading arm is operated by a remote controller or an operation table, and is logically controlled by a PLC. The invention obviously reduces the height of the mounting upright post of the unloading arm for the LNG ship, meets the loading and unloading requirements of the low-water-level small ship, reduces the overall structural size and weight of the LNG unloading arm, reduces the load on the ship body, and improves the running stability of the ship body.

Description

LNG marine arm of unloading
Technical Field
The invention belongs to the technical field of LNG conveying and transferring devices, and particularly relates to an LNG ship unloading arm between offshore ships and between offshore platforms and ships.
Background
At present, an offshore liquefied natural gas (LiquefiedNatural Gas, LNG) conveying device mainly comprises an LNG unloading arm and a low-temperature hose, wherein the LNG unloading arm has the advantages of large conveying flow, long service life, low conveying flow resistance and the like, and is widely applied to the offshore large-flow conveying field. The mainstream LNG unloading arm adopts rotary balance formula structure more, for preventing to take place to interfere in the rotary motion process, the stand size of LNG unloading arm is higher, for meeting and connect the boat (take over lower requirement of water level), need further increase LNG unloading arm overall structure size, increased hull load like this, be unfavorable for the hull stable.
Disclosure of Invention
The invention aims to solve the problems in the background art and provides the LNG ship unloading arm, which is used for remarkably reducing the height of an installation upright post of the LNG ship unloading arm, meeting the loading and unloading requirements of a low-water-level boat, reducing the overall structural size and weight of the LNG unloading arm, reducing the load on a ship body and improving the running stability of the ship body.
In order to achieve the aim, the invention discloses an LNG ship unloading arm, which comprises a mounting base, an integral rotation driving device and an LNG ship unloading arm main body, wherein the mounting base is provided with a plurality of guide rails; the LNG ship unloading arm main body is arranged above the mounting base through the integral rotation driving device; the LNG ship unloading arm main body comprises an inner arm parallelogram support driving system, an outer arm parallelogram support driving system and a pipeline system; the inner arm parallelogram support driving system drives rotation through the inner arm splayed oil cylinder group to drive a pipeline supported on the inner arm to synchronously move; the outer arm parallelogram support driving system drives the pipelines supported on the outer arm to synchronously move through the outer arm splayed oil cylinder group; the unloading arm for the LNG ship is remotely controlled through the remote controller or the operation table, so that the inner arm parallelogram support driving system and the outer arm parallelogram support driving system move to drive the tail end butt joint device of the pipeline system to move to the butt joint flange position of the LNG injection ship, and a conveying passage is established.
Further, the integral slewing drive device comprises an external tooth-shaped slewing bearing and a hydraulic motor; the installation base is connected with the LNG ship unloading arm main body through the external tooth-shaped slewing bearing, and the LNG ship unloading arm main body is driven to rotate through the hydraulic motor.
Further, the inner arm parallelogram support driving system comprises an inner arm main frame, an inner arm connecting rod and an inner arm counterweight bracket; the inner arm main frame is hinged with a rotation mounting support on the integral rotary driving device, one end of an inner arm connecting rod is hinged with a support welded on the inner arm main frame, the other end of the inner arm connecting rod is hinged with a support welded on the front end of an inner arm counterweight support, the middle part of the inner arm counterweight support is hinged with an upper support column hinged support on the integral rotary driving device through a rotary support, the four hinge points form four vertexes of a parallelogram, the inner arm main frame and the inner arm counterweight support keep the same rotation angle, and counterweight balance of the inner arm main frame at each movement position is realized by adjusting the configuration weight of the inner arm counterweight support.
Further, an inner arm splayed oil cylinder group is arranged on the inner arm main frame, the inner arm splayed oil cylinder group consists of two oil cylinders, the front end of each oil cylinder is connected with a steel wire rope, and the steel wire ropes are connected to an inner arm driving rope wheel through buckles; the two cylinders of the splayed cylinder group of the inner arm keep opposite movement directions and have the same stroke, and the inner arm main frame is driven to rotate through the telescopic coordination movement of the two cylinders.
Further, the outer arm parallelogram support driving system comprises an outer arm main frame, an outer arm connecting rod and an outer arm counterweight bracket; the middle part of the outer arm main frame is hinged with the inner arm main frame through a slewing bearing, one end of an outer arm connecting rod is hinged with a support welded on the outer arm main frame, the other end of the outer arm connecting rod is hinged with a support welded at the front end of an outer arm counterweight support, the tail end of the outer arm counterweight support is hinged with the tail end of the inner arm main frame through a slewing bearing, the four hinging points form four vertexes of a parallelogram, the outer arm main frame and the outer arm counterweight support keep the same rotation angle, and counterweight balance of the outer arm main frame at all movement positions is realized by adjusting the counterweight weight of the outer arm counterweight support.
Further, the outer arm splayed oil cylinder group is installed on the outer arm counterweight support, the outer arm splayed oil cylinder group consists of two oil cylinders, the front end of each oil cylinder is connected with a steel wire rope, the steel wire ropes are connected to an outer arm driving rope wheel through buckles, the two oil cylinders of the outer arm splayed oil cylinder group keep opposite movement directions and have the same stroke, the outer arm counterweight support is driven to rotate through telescopic cooperation movement of the two oil cylinders, and the outer arm main frame is driven to rotate through the parallelogram mechanism.
Further, the pipeline system comprises an inner arm pipeline, an outer arm pipeline and a rotary joint; the inner arm pipeline is supported on the inner arm main frame through a bracket, and a rotary joint on the inner arm pipeline and a slewing bearing for connecting the inner arm main frame with the rotary mounting support are coaxially arranged; the rear end of the inner wall pipeline is connected with a liquid tank pipeline below the mounting base, and the liquid tank pipeline is connected with a liquid tank; the front end of the inner arm pipeline is hinged with the rear end of the outer arm pipeline through a rotary joint, and the rotary joint is positioned in a slewing bearing for connecting the inner arm main frame and the outer arm main frame; the front end of the outer arm pipeline is connected to the outer arm main frame through a connecting bracket and a slewing bearing; the front end of the outer arm pipeline is provided with three rotary joints with mutually perpendicular axes, so that the front end pipeline body rotates around the three axes; the front end part of the outer arm pipeline is used for being connected with a butt flange of the LNG injection ship; the front end part of the outer arm pipeline is provided with an emergency release device and a quick connection device.
Further, the LNG ship unloading arm is provided with a hydraulic power unit and a PLC control unit, the hydraulic power unit is connected with a hydraulic actuator on the LNG ship unloading arm main body through a hydraulic pipeline, and the PLC control unit is installed in a remote control room; and a control instruction is sent to the PLC through the remote controller or the operation desk, and the PLC controls the hydraulic power unit to provide hydraulic power for the hydraulic actuating mechanism on the LNG ship unloading arm main body so as to drive the LNG ship unloading arm to move.
Compared with the prior art, the invention has the remarkable progress that: the utility model provides a two four connecting rods drive form LNG marine unloading arm has reduced LNG marine unloading arm installation stand height by a wide margin, satisfies low water level boat loading and unloading demand, has reduced LNG unloading arm overall structure size and weight, has alleviateed the hull load, has improved hull operating stability.
In order to more clearly describe the functional characteristics and structural parameters of the present invention, the following description is made with reference to the accompanying drawings and detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a front view of an LNG ship's discharge arm assembly;
FIG. 2 is a rear view of the LNG ship unloading arm assembly;
FIG. 3 is a schematic diagram of the inner arm parallelogram support drive system assembly;
FIG. 4 is a schematic diagram of the outer arm parallelogram support drive system assembly;
FIG. 5 is a schematic diagram of piping system components;
fig. 6 is a schematic diagram of a control system principle.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, the LNG ship unloading arm is composed of a mounting base 1, a rotary mounting support 4, an upper support column 5, an inner arm parallelogram support driving system 7, an outer arm parallelogram support driving system 9, a pipeline system 8, and the like. The LNG ship is unloaded arm main part and is connected with installation base 1 through first slewing bearing 2, and first slewing bearing 2 adopts the external tooth formula, drives the gear motion through hydraulic motor 3 and drives whole gyration. The two hinge points of the inner arm parallelogram support driving system 7 are respectively connected with the rotation mounting support 4 and the upper support column hinge support 11 through the second slewing bearing 6 and the third slewing bearing 12, and the two hinge points of the outer arm parallelogram support driving system 7 are respectively connected with the front end of the inner arm main frame 7-1 and the tail end of the inner arm main frame 7-1 through the fourth slewing bearing 10 and the fifth slewing bearing 13. The pipe system 8 is supported on the inner arm parallelogram support driving system 7 and the outer arm parallelogram support driving system 9 by responsive brackets.
As shown in fig. 3, the inner arm parallelogram support driving system is composed of an inner arm main frame 7-1, an inner arm connecting rod 7-2, an inner arm counterweight bracket 7-3, an inner arm splayed oil cylinder group 7-7 and the like. One end of the inner arm connecting rod 7-2 is hinged with the first support 7-5 welded on the inner arm main frame 7-1, the other end of the inner arm connecting rod 7-2 is hinged with the second support 7-5 welded on the front end of the inner arm counterweight support 7-3, the middle part of the inner arm counterweight support 7-3 is hinged with the upper support upright post hinged support 11 through the third slewing bearing 12, the inner arm main frame 7-1 is hinged with the rotation mounting support 4, the four hinging points form four vertexes of a parallelogram (the parallelogram is shown as thick black connecting lines 7-10 in the figure), the movement principle of the parallelogram is available, the inner arm main frame 7-1 and the inner arm counterweight support 7-3 keep the same rotation angle, and the counterweight balance of the inner arm main frame 7-1 at each movement position is realized by adjusting the weight of the counterweight 7-4.
As shown in fig. 3, an inner arm splayed oil cylinder group 7-7 is mounted on an inner arm main frame 7-1, and is composed of two oil cylinders, the front end of each oil cylinder is connected with a steel wire rope 7-8, the steel wire rope 7-8 is connected to an inner arm driving rope wheel 4-1 through a buckle 7-9 (the inner arm driving rope wheel 4-1 is welded on a rotation mounting support 4), and the inner arm main frame 7-1 is driven to rotate around the axis of the inner arm driving rope wheel 4-1 through the inner arm splayed oil cylinder group 7-7, wherein the specific principle is that: when the left (same as the drawing direction, the lower part) oil cylinder is contracted, one end of the left side of the steel wire rope 7-8 connected with the oil cylinder is tensioned, the steel wire rope is fixedly connected to the inner arm driving rope wheel 4-1 (the steel wire rope cannot slide on the rope wheel) according to the fastening 7-9 on the steel wire rope, the inner arm driving rope wheel 4-1 rotates anticlockwise around the axis of the steel wire rope under the action of the left side pulling force of the steel wire rope 7-8, at the moment, the right side of the steel wire rope 7-8 is synchronously tensioned, the right side oil cylinder synchronously extends (the extending distance of the right side oil cylinder is the same as the retracting distance of the left side oil cylinder), the steel wire rope pulling force is maintained, and the same can rotate clockwise around the axis of the right side oil cylinder when the left side oil cylinder extends, namely, the two oil cylinder parts of the inner arm splayed oil cylinder group 7-7 move anticlockwise (one retracts, one extends) and the same stroke, and the rotation of the inner arm main frame 7-1 can be realized.
As shown in fig. 4, the outer arm parallelogram support driving system is composed of an outer arm main frame 9-1, an outer arm counterweight bracket 9-2, an outer arm connecting rod 9-3, an outer arm splayed oil cylinder group 9-7 and the like. The middle part of the outer arm main frame 9-1 is hinged with the inner arm main frame 7-1 through a fourth slewing bearing 10, one end of the outer arm connecting rod 9-3 is hinged with a third support 9-4 welded on the outer arm main frame 9-1, the other end of the outer arm connecting rod 9-3 is hinged with a support welded on the front end of the outer arm counterweight support 9-2, the tail end of the outer arm counterweight support 9-2 is hinged with the tail end of the inner arm main frame 7-1 through a fifth slewing bearing 13, the four hinging points form four vertexes of a parallelogram (the parallelogram is shown as a thick black connecting line 9-10 in the figure), the same rotation angle of the outer arm main frame 9-1 and the outer arm counterweight support 9-2 is kept by the parallelogram motion principle, and the counterweight balance of the outer arm main frame 9-1 at all motion positions is realized by adjusting the weight of the counterweight 9-6.
As shown in fig. 4, an outer arm splayed oil cylinder group 9-7 is installed on an outer arm counterweight bracket 9-2, and is composed of two oil cylinders, the front end of each oil cylinder is connected with a steel wire rope 9-8, the steel wire rope 9-8 is connected to an outer arm driving rope pulley 4-2 through a buckle 9-9 (the outer arm driving rope pulley 4-2 is welded on a rotation installation support 4), and the outer arm counterweight bracket 9-2 is driven to rotate around the axis of the outer arm driving rope pulley 4-2 through an inner arm splayed oil cylinder group 9-7, and the specific principle is that: when the left (the same direction as shown in fig. 4, the lower part is the same) cylinder is contracted, one end of the left side of the steel wire rope 9-8 connected with the cylinder is tensioned, the steel wire rope is fixedly connected to the outer arm driving rope wheel 4-2 (the steel wire rope cannot slide on the rope wheel) according to the clamping buckle 9-9 on the steel wire rope, the outer arm driving rope wheel 4-2 rotates anticlockwise around the axis under the action of the left side pulling force of the steel wire rope 9-8, at the moment, the right side of the steel wire rope 9-8 is synchronously tensioned, the right cylinder synchronously extends (the extending distance of the right cylinder is the same as the retracting distance of the left cylinder) to keep the pulling force of the steel wire rope, and in the same way, when the right cylinder is contracted, the left cylinder extends, the outer arm driving rope wheel 4-2 rotates clockwise around the axis, namely, through the reverse (one retracting and one extending) movement of two cylinder parts of the outer arm splayed cylinder group 9-7 with the same stroke, and the rotation of the outer arm counterweight bracket 9-2 can be realized.
As shown in fig. 5, the pipeline system 8 is composed of pipeline components such as a multi-stage pipeline, a rotary joint, an emergency release device, a quick connection device and the like. Wherein, the tail end of the inner arm pipeline 8-1 is supported on the inner arm main frame 7-1 through a bracket 8-4, and a first rotary joint 8-3 on the inner arm pipeline 8-1 and a second rotary support 6 (used for connecting the inner arm main frame 7-1 with the rotary mounting support 4) are coaxially arranged; the front end of the inner arm pipeline 8-1 is hinged with the rear end of the outer arm pipeline 8-2 through a second rotary joint 8-5, and the second rotary joint 8-5 is positioned inside a fourth slewing bearing 10 (used for connecting the inner arm main frame 7-1 with the outer arm main frame 9-1); the front end of the outer arm pipeline 8-2 is connected to the outer arm main frame 9-1 through a connecting bracket 8-7 and a slewing bearing 8-6. The pipeline system 8 realizes rotary support through two fulcrums of the bracket 8-4 and the connecting bracket 8-7 and can realize synchronous movement along with the inner arm main frame 7-1 and the outer arm main frame 9-1. The front end of the pipeline system 8 is provided with a third rotary joint 8-8, a fourth rotary joint 8-9 and a fifth rotary joint 8-11, so that the rotation of the pipeline at the front end in the directions of x, y and z three axes can be realized. An emergency release device 8-10 is arranged to cut off and separate the pipeline in emergency, and a quick connection device 8-12 is arranged to realize quick connection with the butt flange.
Specifically, in this embodiment, one end of the third rotary joint 8-8 is connected to the front end of the outer arm pipeline 8-2 through a flange, the other end of the third rotary joint 8-8 is connected to the upper end of the fourth rotary joint 8-9 through a bent pipe section, and the lower end of the fourth rotary joint 8-9 is connected to the emergency release device 8-10 through a flange. One end of the fifth rotary joint 8-11 is connected with the lower part of the emergency release device 8-10 through a bent pipe section, and the other end is connected with the quick connection device 8-12 through a flange.
As shown in fig. 6, the LNG ship unloading arm is equipped with a hydraulic power unit 01 and a PLC control unit 02, and a control command is sent to the PLC controller 04 through a remote controller 03 or an operation table 04, and the PLC controller 02 controls the hydraulic power unit 01 to provide hydraulic power for a hydraulic actuator on the LNG ship unloading arm, so as to drive the LNG ship unloading arm to move. The hydraulic power unit is arranged near the LNG ship unloading arm and is connected with a hydraulic actuating mechanism on the LNG ship unloading arm through a hydraulic pipeline; the PLC control unit is installed in the remote control room. The hydraulic actuating mechanism comprises a hydraulic motor 3, an inner arm splayed oil cylinder group 7-7 and an outer arm splayed oil cylinder group 9-7.
The LNG marine unloading arm comprises the following working procedures: after the LNG is injected into the ship and the marine LNG external transportation terminal to finish berthing operation, the unloading arm for the LNG ship is remotely controlled to extend to the butt flange position of the LNG injected ship through the remote controller 03 or the operating platform 04, and the connection is finished through the front end quick connecting device 8-12, so that a transportation path is established. The motion principle of the LNG ship unloading arm is as follows: the hydraulic motor 3 drives the integral rotation of the LNG ship unloading arm main body part; the rotation of the inner arm main frame 7-1 around the inner arm driving rope wheel 4-1 is realized through the inner arm splayed oil cylinder group 7-7, and the balance weight in the rotation process of the inner arm main frame 7-1 is kept through the inner arm parallelogram supporting driving system; the rotation of the outer arm main frame 9-1 around the outer arm driving rope wheel 5-1 is realized through the outer arm splayed oil cylinder group 9-7, and the balance weight in the rotation process of the outer arm main frame 9-1 is kept through the outer arm parallelogram supporting driving system; the front end of the pipeline system 8 is provided with a third rotary joint 8-8, a fourth rotary joint 8-9 and a fifth rotary joint 8-11, so that the rotation of the pipeline at the front end in the directions of x, y and z three axes can be realized. In summary, the quick connecting device 8-12 at the front end of the LNG ship unloading arm pipeline can realize space six-degree-of-freedom motion, and meets the ship receiving requirement.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present 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 therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The LNG marine unloading arm is characterized by comprising a mounting base, an integral rotation driving device and an LNG marine unloading arm main body; the LNG ship unloading arm main body is arranged above the mounting base through the integral rotation driving device; the LNG ship unloading arm main body comprises an inner arm parallelogram support driving system, an outer arm parallelogram support driving system and a pipeline system; the inner arm parallelogram support driving system drives the pipelines supported on the inner arm to synchronously move through the inner arm splayed oil cylinder group; the outer arm parallelogram support driving system drives the pipelines supported on the outer arm to synchronously move through the outer arm splayed oil cylinder group; the unloading arm for the LNG ship is remotely controlled through the remote controller or the operation table, so that the inner arm parallelogram support driving system and the outer arm parallelogram support driving system move to drive the tail end butt joint device of the pipeline system to move to the butt joint flange position of the LNG injection ship, and a conveying passage is established.
2. The LNG ship unloading arm of claim 1, wherein the integral swing drive comprises an externally toothed swing bearing and a hydraulic motor; the installation base is connected with the LNG ship unloading arm main body through the external tooth-shaped slewing bearing, and the LNG ship unloading arm main body is driven to rotate through the hydraulic motor.
3. The LNG ship unloading arm of claim 1, wherein the inner arm parallelogram support drive system comprises an inner arm main frame, an inner arm link, an inner arm counterweight support; the inner arm main frame is hinged with a rotation mounting support on the integral rotary driving device, one end of an inner arm connecting rod is hinged with a support welded on the inner arm main frame, the other end of the inner arm connecting rod is hinged with a support welded on the front end of an inner arm counterweight support, the middle part of the inner arm counterweight support is hinged with an upper support column hinged support on the integral rotary driving device through a rotary support, the four hinge points form four vertexes of a parallelogram, the inner arm main frame and the inner arm counterweight support keep the same rotation angle, and counterweight balance of the inner arm main frame at all movement positions is realized by adjusting the configuration weight of the inner arm counterweight support.
4. A LNG ship unloading arm according to claim 3, wherein the inner arm splayed cylinder group is mounted on the inner arm main frame, the inner arm splayed cylinder group is composed of two cylinders, the front end of the cylinders is connected with a steel wire rope, and the steel wire rope is connected to the inner arm driving rope wheel through a buckle; the two cylinders of the splayed cylinder group of the inner arm keep opposite movement directions and have the same stroke, and the inner arm main frame is driven to rotate through the telescopic coordination movement of the two cylinders.
5. A LNG ship unloading arm according to claim 3, wherein the outer arm parallelogram support driving system comprises an outer arm main frame, an outer arm link, an outer arm counterweight support; the middle part of the outer arm main frame is hinged with the inner arm main frame through a slewing bearing, one end of the outer arm connecting rod is hinged with a support welded on the outer arm main frame, the other end of the outer arm connecting rod is hinged with a support welded at the front end of the outer arm counterweight support, the tail end of the outer arm counterweight support is hinged with the tail end of the inner arm main frame through a slewing bearing, the four hinging points form four vertexes of a parallelogram, the outer arm main frame and the outer arm counterweight support keep the same rotation angle, and the counterweight balance of the outer arm main frame at each movement position is realized by adjusting the counterweight weight of the outer arm counterweight support.
6. The LNG ship unloading arm according to claim 4, wherein the outer arm splayed cylinder group is mounted on an outer arm counterweight support, the outer arm splayed cylinder group is composed of two cylinders, the front ends of the cylinders are connected with steel wire ropes, the steel wire ropes are connected to an outer arm driving rope sheave through buckles, the two cylinders of the outer arm splayed cylinder group keep opposite movement directions and have the same travel, the outer arm counterweight support is driven to rotate through telescopic cooperation movement of the two cylinders, and the outer arm main frame is driven to rotate through a parallelogram mechanism.
7. The LNG ship unloading arm of claim 5, wherein the piping system comprises an inner arm line, an outer arm line, a swivel joint; the inner arm pipeline is supported on the inner arm main frame through a bracket, and a rotary joint on the inner arm pipeline and a slewing bearing for connecting the inner arm main frame with the rotary mounting support are coaxially mounted; the rear end of the inner wall pipeline is connected with a liquid tank pipeline below the mounting base, and the liquid tank pipeline is connected with a liquid tank; the front end of the inner arm pipeline is hinged with the rear end of the outer arm pipeline through a rotary joint, and the rotary joint is positioned in a slewing bearing for connecting the inner arm main frame and the outer arm main frame; the front end of the outer arm pipeline is connected to the outer arm main frame through a connecting bracket and a slewing bearing; the front end of the outer arm pipeline is provided with three rotary joints with mutually perpendicular axes, so that the front end pipeline body rotates around the three axes; the front end part of the outer arm pipeline is used for being connected with a butt flange of the LNG injection ship; the front end part of the outer arm pipeline is provided with an emergency release device and a quick connection device.
8. The LNG ship unloading arm according to claim 1, wherein the LNG ship unloading arm is equipped with a hydraulic power unit and a PLC control unit, the hydraulic power unit is connected with a hydraulic actuator on the LNG ship unloading arm main body through a hydraulic pipeline, and the PLC control unit is installed in a remote control room; and a control instruction is sent to the PLC through the remote controller or the operation desk, and the PLC controls the hydraulic power unit to provide hydraulic power for the hydraulic actuating mechanism on the LNG ship unloading arm main body so as to drive the LNG ship unloading arm to move.
CN202311752141.4A 2023-12-19 2023-12-19 LNG marine arm of unloading Pending CN117685496A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311752141.4A CN117685496A (en) 2023-12-19 2023-12-19 LNG marine arm of unloading

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Application Number Priority Date Filing Date Title
CN202311752141.4A CN117685496A (en) 2023-12-19 2023-12-19 LNG marine arm of unloading

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Publication Number Publication Date
CN117685496A true CN117685496A (en) 2024-03-12

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CN202311752141.4A Pending CN117685496A (en) 2023-12-19 2023-12-19 LNG marine arm of unloading

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