Sea surface supply displacement measuring device

Abstract

The sea surface supply displacement measuring device comprises a base arranged on a supply ship deck, a rotating structure arranged on the base, a suspension arm arranged on the rotating structure, a steering structure arranged at the front end of the suspension arm, a measuring winch, a supply winch and a control system, wherein the measuring winch and the supply winch are arranged on the suspension arm; the rotating structure realizes rotation of the suspension arm relative to the base, the suspension arm is rotatably connected with the rotating structure, a variable-amplitude structure is further connected between the suspension arm and the rotating structure, and the variable-amplitude structure realizes rotation of the suspension arm relative to the rotating structure; a rope of the measuring winch penetrates through the steering structure and then is connected with the measuring weight, and a rope of the supply winch penetrates through the steering structure and then is connected with the supply object. The control system controls the rotating structure and the variable amplitude structure to adjust the state of the suspension arm and the ascending and descending of the measuring winch and the supply winch so as to realize the transfer of the measuring weight and the supply object between the supply ship and the ship to be supplied. According to the invention, wave influence is effectively offset while accurate displacement measurement is realized in ship-to-ship supply operation.

Description

Technical Field

[0001] The invention belongs to the field of marine replenishment, and in particular relates to a sea surface replenishment displacement measuring device. Background Art

[0002] Ship-to-ship replenishment at sea refers to the process of providing fuel, food, water or other supplies from one ship to another ship, whether it is sailing or stationary, at sea. This operation usually takes place in waters far from land and is essential to keep ships running for a long time. However, when conducting such replenishment, there are many challenges, the most notable of which is the constant change in the relative position between the two ships due to waves.

[0003] In actual operations, wind and wave forces make it difficult for the ships involved in the replenishment to maintain stability, especially when two ships try to get close to facilitate the transfer of goods. This instability not only increases the safety risks during the replenishment process, but also directly affects the efficiency and accuracy of material transfer.

[0004] Most cranes currently used for offshore replenishment operations do not have heave compensation capabilities, which means they cannot effectively cope with the swaying of the ship caused by changing sea conditions. In addition, many traditional models lack accurate displacement measurement capabilities, further limiting their application in complex marine environments.

[0005] Some of the lifting equipment currently on the market that combines wave compensation technology and displacement monitoring systems often require the measurement winch to be fixed to a specific position on the ship to be supplied (such as the eye plate on the deck), which not only increases the workload before installation, but also means that only ships that have prepared the corresponding facilities in advance can use this function. The posture is difficult to control, and even under ideal conditions, it is extremely challenging to ensure that the compensation crane can be accurately positioned directly above the target ship. Once a deviation occurs, even a small angular error may cause the measuring hook to be tilted, which in turn affects the accuracy of the final data. Operations under harsh conditions are extremely difficult, especially when performing tasks in high sea conditions. Operators responsible for mounting the measuring device face great challenges. They not only need to overcome physical discomfort, but also risk their lives to complete their work. Summary of the invention

[0006] The purpose of the present invention is to provide a sea surface replenishment displacement measurement device to solve the technical problem of how to complete ship-to-ship replenishment at sea safely and efficiently.

[0007] To achieve the above-mentioned purpose, the specific technical scheme of a sea surface replenishment displacement measurement device of the present invention is as follows:

[0008] A sea surface replenishment displacement measuring device comprises a base arranged on a supply ship deck, a rotating structure arranged on the base, a boom arranged on the rotating structure, a steering structure arranged at the front end of the boom, a measuring winch and a replenishment winch arranged on the boom, and a control system;

[0009] The rotating structure enables the boom to rotate relative to the base, the boom is rotatably connected to the rotating structure, and a variable amplitude structure is further connected between the boom and the rotating structure, and the variable amplitude structure enables the boom to rotate relative to the rotating structure;

[0010] The rope of the measuring winch passes through the steering structure and is connected to the measuring weight, and the rope of the supply winch passes through the steering structure and is connected to the supply object;

[0011] The control system adjusts the state of the boom and the lifting and lowering of the measuring winch and the supply winch by controlling the rotating structure and the luffing structure, thereby realizing the transfer of the measuring weights and the supplies between the supply ship and the ship to be supplied.

[0012] As a further improvement of the present invention, the measuring winch includes a measuring motor, a measuring valve group controlling the measuring motor, a measuring reel rotating under the drive of the measuring motor, and a measuring encoder monitoring the measuring winch in real time and feeding back information to the control system.

[0013] As a further improvement of the present invention, the control system controls the lifting and lowering of the supply winch according to information fed back by the measuring encoder.

[0014] As a further improvement of the present invention, the measuring winch turns on and off a wave compensation function through the control system, and the wave compensation function realizes a constant tension of the measuring winch.

[0015] As a further improvement of the present invention, the measuring valve group includes a throttle valve for adjusting the oil intake of the measuring motor, a balancing valve for maintaining the load, an overflow valve for adjusting the constant tension of the measuring winch, and a solenoid valve for controlling the opening and closing of the overflow valve; the control system realizes the opening and closing of the wave compensation function of the measuring winch by controlling the opening and closing of the solenoid valve.

[0016] As a further improvement of the present invention, the set pressure of the overflow valve is less than the weight of the measuring weight.

[0017] As a further improvement of the present invention, the rotating structure includes a rotating base rotatably connected to the upper end surface of the base and a rotating drive device, the boom can be rotatably connected to the upper end surface of the rotating base, and the rotating drive device drives the rotating base to rotate relative to the base to achieve horizontal rotation of the boom.

[0018] As a further improvement of the present invention, the amplitude-changing structure is a hydraulic cylinder structure, including an amplitude-changing cylinder and a piston rod. The amplitude-changing cylinder is fixedly connected to the rotating base, and the extended end of the piston rod is connected to the boom. The piston rod is telescopic relative to the amplitude-changing cylinder to realize the lifting and lowering of the boom.

[0019] As a further improvement of the present invention, the steering structure includes a plurality of steering wheels, and the ropes of the measuring winch and the supply winch are respectively connected to the measuring weight and the supply after being turned by the steering wheels.

[0020] Beneficial effects:

[0021] The present invention provides a displacement measurement device with wave compensation function, which is particularly suitable for ship-to-ship replenishment operations at sea. By integrating advanced rotation, amplitude change and control systems, the device can achieve efficient and safe material transfer in complex and changeable sea conditions.

[0022] The use of precise displacement measurement and real-time feedback mechanism, combined with wave compensation technology, can significantly reduce the risk of accidents caused by ship shaking. Especially in severe weather conditions, it ensures stability during the lifting process, reduces the risk of injury, quickly and accurately locates the target, and automatically adjusts to the best working state, greatly shortening the preparation time and the entire replenishment cycle.

[0023] By monitoring the status of the measuring winch in real time and dynamically adjusting the speed of the supply winch accordingly, the supply remains stable throughout the entire transfer process. This not only improves operational accuracy, but also reduces cargo damage caused by speed mismatch. When the measuring winch detects displacement changes caused by waves, the control system can respond immediately and adjust the working parameters of the supply winch, thereby effectively offsetting external interference and maintaining the stability and reliability of the system. Since the supply winch can smoothly accelerate or decelerate according to actual needs, the impact force on the hoisted items can be greatly reduced, which is especially important for protecting fragile or valuable goods.

[0024] Unlike some existing solutions, the device can operate normally without the need for the supply vessel to pre-install specific eye plates or other auxiliary facilities. This means that almost all types of boats can benefit from it, greatly improving the versatility and flexibility of the system.

[0025] By implementing constant tension management on the measuring winch, the rope of the measuring winch is always in a tensioned state regardless of the heave speed of the measured ship, thereby transmitting the accurate displacement signal of the measured ship to the control system.

[0026] In summary, the present invention combines the displacement measurement technology with the wave compensation function, introduces a supply winch speed adjustment mechanism based on measuring winch feedback information, and provides a safer, more efficient and reliable solution for offshore ship-to-ship supply operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a sea surface replenishment displacement measurement device of the present invention;

[0028] Figure 2 Schematic diagram of the measurement winch structure;

[0029] Figure 3 This is a schematic diagram of the measuring valve group;

[0030] Explanation of marks in the figure: 100, supply ship; 200, ship to be supplied; 300, base; 400, rotating structure; 500, boom; 600, variable amplitude structure; 700, steering structure; 800, measuring winch; 810, measuring motor; 820, measuring valve group; 821, throttle valve; 822, balancing valve; 823, overflow valve; 824, solenoid valve; 830, measuring reel; 840, measuring encoder; 850, wall frame; 900, supply winch; 1000, measuring weights; 1100, supplies. DETAILED DESCRIPTION

[0031] In order to better understand the purpose, structure and function of the present invention, a sea surface replenishment displacement measuring device of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0032] Implementation example:

[0033] like Figure 1As shown, a sea surface replenishment displacement measurement device is used for ship-to-ship replenishment on the sea surface. A base 300 is fixed on the deck of a replenishment ship 100 as a support for the entire device. A rotating structure 400 is arranged on the upper end surface of the base 300. The upper end of the rotating structure 400 is connected to a boom 500 and a luffing structure 600. The rotating structure 400 and the luffing structure 600 adjust the position of the boom 500 in both horizontal and vertical directions. A replenishment winch 900 and a measuring winch 800 are arranged on the boom. A steering structure 700 is arranged on the top of the boom 500. The ropes attached to the replenishment winch 900 and the measuring winch 800 are connected to the replenishment object 1100 and the measuring weight 1000 respectively after passing through the steering structure 700 along the boom 500. After the measuring weight 1000 is first released to the deck of the ship to be replenished 200, the replenishment winch 900 adjusts the rotation speed according to the feedback data of the measuring winch 800, and smoothly transfers the replenishment object 1100 to the ship to be replenished 100. The device of the present invention provides electrical control and hydraulic power through a control system to control the rotating structure 400 and the luffing structure 600, while monitoring the operation of the measuring winch 800 and the supply winch 900 in real time.

[0034] The rotating structure 400 includes a rotating base and a rotating driving device. The rotating driving device is located on the upper end surface of the rotating base and drives the rotating base to rotate relative to the base 300 in the horizontal range, and drives the boom 500 located on the upper end surface of the rotating base to rotate and adjust the direction. The variable amplitude structure 600 is a hydraulic structure. The variable amplitude cylinder is connected to the rotating base. The piston rod extends from the variable amplitude cylinder and is connected to the boom 500. The height adjustment of the boom 500 in the vertical direction is achieved by the piston rod extending relative to the variable amplitude cylinder. The steering structure 700 includes a plurality of steering wheels for the winch rope to pass through. The rope passes through the steering wheel and is connected to the object to be connected.

[0035] like Figure 2 As shown, the measuring winch 800 is fixed on the boom 500 through the wall frame 850, the rope is wound on the measuring drum 830 and extends along the boom 500 to the steering structure 700, and the measuring drum 830 is arranged in the hollow wall frame 850, one end of which is connected to the measuring motor 810 and the measuring valve group 820, and the other end is connected to the measuring encoder 840. The measuring motor 810 rotates under the control of the measuring valve group 820, and the forward and reverse rotations realize the measuring drum 830 to reel in and unreel the rope.

[0036] The measuring motor 810 is the power output element of the measuring winch 800, which controls the retraction and extension of the rope of the measuring winch 800. When the supply ship 1100 is lowered by the waves, the measuring motor 810 is in a passive reverse towing state. When the supply ship 1100 is raised by the waves, the measuring motor 810 is supplied with oil by the hydraulic system and is in an active lifting state. Figure 3As shown, in the measuring valve group 820, the throttle valve 821 is used to adjust the oil intake of the measuring motor 810, so as to control the lifting speed of the measuring winch 800; the balance valve 822 is used to lock the hook position of the measuring winch 800 to prevent the hook from slipping when it stops in the air; the solenoid valve 824 is responsible for opening and closing the overflow valve 823 under the control of the control system; the overflow valve 823 is used to set the overflow pressure, that is, the constant tension of the measuring winch 800. When the wave compensation function is activated, the overflow valve is in an open state, and the measuring winch 800 is in a constant tension working mode. The overflow valve 823 is used to adjust the size of the constant tension and maintain the constant tension.

[0037] When using, Figure 1 As shown, when the ship-to-ship supply operation is carried out at sea, the device of the present invention installed on the supply ship 100 transfers the supply 1100 from the deck of the supply ship 100 to the deck of the ship to be supplied 200 through the rotation of the boom 500. At this time, the operator controls the measuring winch 800 through the control system to transfer the measuring weight on the hook to the deck of the ship to be supplied 200, and starts the wave compensation function of the measuring winch 800. The solenoid valve 824 in the measuring valve group 820 is energized, and the overflow valve 823 is opened. Since the set pressure value of the overflow valve 823 is much lower than the pressure for lifting the measuring weight 1000, the measuring motor 810 is reversed, and the measuring weight 1000 falls directly on the deck. At the same time, the energized measuring winch 800 is always in the lifting state, so that the measuring winch rope is always in the tension state during wave compensation, and it automatically rises and sinks with the ship to be supplied 200 under the action of waves with a constant tension. When the measuring winch rope moves with the waves, the measuring encoder 840 transmits the vertical displacement data of the waves to the control system in real time. The control system transmits the control signal to the motor electric proportional valve of the supply winch 900 after program processing and calculation by the CPU, and controls the landing speed of the supply 1100 relative to the deck, thereby achieving the purpose of wave compensation. When the supply operation is completed, the wave compensation function is canceled, the solenoid valve 824 is powered off, the overflow valve 823 is closed, and the measuring winch 800 is operated to hoist the measuring weight back to the supply ship.

[0038] In the device of the present invention, the supply winch 900 is used to collect and release cargo during the supply operation, and the measuring winch 800 is used to measure the relative displacement of the supply ship 100 and the ship to be supplied 200 during the compensation operation. When the existing ship is docked for supply operation, the crane arm is usually rotated to the top of the ship to be supplied, and then the operator of the ship to be supplied hangs the measuring winch hook on the eye plate of the ship to be supplied. Since the ship is affected by the waves, the posture of the two ships is difficult to control accurately, which makes it difficult to ensure that the measuring hook of the compensation crane can be directly above the compensated ship in the preparation stage. Therefore, the measuring hook will produce oblique pull during operation, resulting in a large displacement deviation, which affects the compensation accuracy. At the same time, the supply operation is usually carried out under severe sea conditions. When the operator of the ship to be supplied hangs the measuring hook, it is very difficult to operate and there is a certain risk. The ship to be supplied must reserve an eye plate on the deck for hanging the measuring hook. For a crane without an eye plate, it is impossible to carry out supply operations, and the applicability is poor. The device of the present invention uses a measuring weight to replace the original measuring hook, and vertically lands on the deck of the supply ship by its own weight, reducing the inclined pull and improving the measurement accuracy. No personnel are required to hook, simplifying the operation process, and the deck of the supply ship does not need to pre-install the eye plate for hanging the measuring hook, which has strong applicability.

[0039] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A sea surface replenishment displacement measurement device, characterized in that: It includes a base arranged on the deck of the supply ship, a rotating structure arranged on the base, a boom arranged on the rotating structure, a steering structure arranged at the front end of the boom, a measuring winch and a supply winch arranged on the boom, and a control system; The rotating structure enables the boom to rotate relative to the base, the boom is rotatably connected to the rotating structure, and a variable amplitude structure is further connected between the boom and the rotating structure, and the variable amplitude structure enables the boom to rotate relative to the rotating structure; The rope of the measuring winch passes through the steering structure and is connected to the measuring weight, and the rope of the supply winch passes through the steering structure and is connected to the supply object; The control system adjusts the state of the boom and the lifting and lowering of the measuring winch and the supply winch by controlling the rotating structure and the luffing structure, thereby realizing the transfer of the measuring weights and the supplies between the supply ship and the ship to be supplied.

2. The sea surface replenishment displacement measuring device according to claim 1, characterized in that: The measuring winch comprises a measuring motor, a measuring valve group for controlling the measuring motor, a measuring drum driven to rotate by the measuring motor, and a measuring encoder for monitoring the measuring winch in real time and feeding back information to the control system.

3. The sea surface replenishment displacement measuring device according to claim 2, characterized in that: The control system controls the lifting and lowering of the supply winch according to the information fed back by the measuring encoder.

4. The sea surface replenishment displacement measuring device according to claim 2, characterized in that: The measuring winch turns on and off a wave compensation function through the control system, and the wave compensation function realizes a constant tension of the measuring winch.

5. The sea surface replenishment displacement measuring device according to claim 4, characterized in that: The measuring valve group includes a throttle valve for adjusting the oil intake of the measuring motor, a balance valve for maintaining the load, a relief valve for adjusting the constant tension of the measuring winch, and a solenoid valve for controlling the opening and closing of the relief valve; The control system realizes the opening and closing of the wave compensation function of the measuring winch by controlling the opening and closing of the electromagnetic valve.

6. The sea surface replenishment displacement measuring device according to claim 5, characterized in that: The set pressure of the relief valve is less than the weight of the measuring weight.

7. The sea surface replenishment displacement measuring device according to claim 1, characterized in that: The rotating structure includes a rotating base rotatably connected to the upper end surface of the base and a rotating drive device, the boom is rotatably connected to the upper end surface of the rotating base, and the rotating drive device drives the rotating base to rotate relative to the base to achieve horizontal rotation of the boom.

8. The sea surface replenishment displacement measuring device according to claim 7, characterized in that: The luffing structure is a hydraulic cylinder structure, including a luffing cylinder and a piston rod. The luffing cylinder is fixedly connected to the rotating base, the extended end of the piston rod is connected to the boom, and the piston rod is retracted relative to the luffing cylinder to realize the lifting and lowering of the boom.

9. The sea surface replenishment displacement measuring device according to claim 1, characterized in that: The steering structure comprises a plurality of steering wheels, and the ropes of the measuring winch and the supply winch are respectively connected to the measuring weight and the supply after being steered by the steering wheels.

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