Displacement measuring structure for offshore hoisting device

Abstract

A displacement measuring structure for an offshore hoisting device comprises a measuring winch, a supply winch and a control system, wherein the measuring winch and the supply winch are arranged on the hoisting device of a supply ship; a rope of the measuring winch is connected with the measuring weight, and a rope of the supply winch is connected with supply goods; the measuring winch comprises a measuring motor, a measuring valve group for controlling the measuring motor, a measuring winding drum driven by the measuring motor to rotate, and a measuring encoder for monitoring the measuring winch in real time and feeding back information to the control system; the control system controls lifting of the supply winch according to information fed back by the measurement encoder. Through combination of a fluctuation compensation mechanism and relative displacement monitoring, safe and effective ship-to-ship supply under high sea conditions is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sea replenishment, especially relate to a displacement measurement structure for offshore hoisting device. BACKGROUND

[0002] Ship-to-ship replenishment at sea is a process in which one ship provides fuel, food, water or other supplies to another ship while sailing. This replenishment method is particularly important for ocean-going ships, as it allows ships to complete replenishment operations without entering a port, thereby saving time and cost and improving operational flexibility. However, due to the complexity of the marine environment, especially when replenishment is carried out in high sea conditions, this process faces many challenges.

[0003] When performing ship-to-ship replenishment tasks at sea, the influence of wind and waves cannot be ignored. Strong winds can cause the relative position between the two ships to change, while large waves can cause severe up-and-down or lateral movement, which greatly increases the difficulty and risk of replenishment operations. In particular, in adverse weather conditions, traditional methods are difficult to ensure safe and effective completion of replenishment tasks.

[0004] Most existing replenishment systems do not fully consider the vertical displacement effect caused by sea waves, which makes it difficult to maintain stability during the transfer of goods in unstable sea conditions. In order to accurately control the distance change between the two ships and the goods transfer path, it is necessary to have the ability to monitor and feedback the relative position information between the ships in real time. It is difficult to control the attitude, even in ideal conditions, to ensure that the compensation crane can accurately position the target ship directly above. Some replenishment ships equipped with measuring winches and other equipment still need to fix these devices to designated points (such as deck eye plates) on the ship to be replenished in actual operation. This approach not only takes a long time, but also is more dangerous to implement in extreme environments. Especially in the face of adverse weather, personnel responsible for installing and maintaining the measurement system must be exposed to open sea, posing a significant personal safety threat. SUMMARY

[0005] The utility model aims at providing a displacement measurement structure for offshore hoisting device, to solve the technical problem of accurately and efficiently completing ship-to-ship replenishment in complex sea conditions.

[0006] To achieve the above-mentioned purpose, the specific technical solution of the displacement measurement structure for offshore hoisting device of the utility model is as follows:

[0007] The application discloses a displacement measuring structure for a marine hoisting device, which comprises a measuring winch and a supply winch arranged on a hoisting device of a supply ship, and a control system; the measuring winch is connected with a measuring weight through a rope, and the supply winch is connected with supply goods through a rope; the measuring winch comprises a measuring motor, a measuring valve group for controlling the measuring motor, a measuring drum driven by the measuring motor, and a measuring encoder for monitoring the measuring winch in real time and feeding back information to the control system; the control system controls the lifting of the supply winch according to the information fed back by the measuring encoder.

[0008] As a further improvement of the application, the measuring valve group comprises a throttle valve for adjusting the oil intake of the measuring motor, a balance valve for keeping 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.

[0009] As a further improvement of the application, the constant tension adjustment of the measuring winch is realized by setting the overflow pressure 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.

[0010] As a further improvement of the application, the set overflow pressure of the overflow valve is less than the weight of the measuring weight.

[0011] As a further improvement of the application, the hoisting device comprises a base arranged on the deck of the supply ship, a rotating structure arranged on the base, a boom arranged on the rotating structure, and a steering structure arranged at the front end of the boom; the measuring winch and the supply winch are arranged on the boom, the rope of the measuring winch is connected with the measuring weight after passing through the steering structure, and the rope of the supply winch is connected with the supply goods after passing through the steering structure; the control system adjusts the state of the boom by controlling the rotating structure and the luffing structure.

[0012] As a further improvement of the application, the rotating structure realizes the rotation of the boom relative to the base, and the boom is rotatably connected with the rotating structure; the rotating structure comprises a rotating base rotatably connected with the upper end face of the base and a rotating driving device, the boom is rotatably connected with the upper end face of the rotating base, and the rotating driving device drives the rotating base to rotate relative to the base, so that the horizontal rotation of the boom is realized.

[0013] As a further improvement of the present application, the boom and the rotating structure are further connected with a luffing structure, the luffing structure realizes the rotation of the boom relative to the rotating base; the luffing structure is a hydraulic cylinder structure, comprising a luffing cylinder and a piston rod, the luffing cylinder is fixedly connected to the rotating base, the piston rod is connected with the boom at the extending end, the piston rod is telescopic relative to the luffing cylinder, realizing the lifting of the boom.

[0014] As a further improvement of the present application, the steering structure comprises a plurality of steering wheels, the ropes of the measuring winch and the supply winch are connected with the measuring weight and the supply cargo respectively after being diverted by the steering wheels.

[0015] Beneficial effects:

[0016] The utility model provides a kind of displacement measurement structure for offshore hoisting device, to solve the many problems existing in the process of ship-to-ship replenishment in prior art, especially in high sea condition. By introducing advanced displacement monitoring and control mechanism, the utility model can significantly improve the safety and efficiency of replenishment operation.

[0017] By setting special measuring winch and its control system, the relative position change between two ships can be monitored and fed back in real time and accurately, so that the safety hazard caused by irregular motion due to sea waves is effectively avoided. Especially in high sea condition, this instant response capability is crucial to protect the operating personnel from injury.

[0018] The utility model adopts constant tension adjusting system (consisting of overflow valve etc.), ensure that even in fluctuating ocean environment, stable tension on rope can be maintained, and then make the cargo transfer process more stable and reliable. In addition, by accurately regulating and controlling the action of supply winch to match the state of measuring winch, the anti-interference performance of the whole system is further improved.

[0019] Compared with the traditional method of fixing measuring equipment to specific points, the utility model can complete displacement monitoring task without additional installation of complex connecting pieces, greatly simplifying preparation work and reducing operation time. This not only improves work efficiency, but also reduces labor cost.

[0020] Considering that different types of ships may have different structural characteristics, the utility model designs a flexible and adjustable hoisting device frame, including rotating mechanism and luffing mechanism components, so that it can easily adapt to the needs of various application scenarios. Whether it is horizontal or vertical position adjustment can be well supported.

[0021] With the aid of advanced encoder technology and intelligent control system, the utility model realizes the highly automatic from data acquisition, analysis processing to the whole process of action. This means that even in extreme weather conditions, it can rely on the system to automatically complete most of the key steps, greatly reducing the need for human intervention.

[0022] In summary, the displacement measurement structure for offshore hoisting device provided by the utility model not only overcomes the deficiencies in the prior art, but also provides strong technical support for realizing more efficient, safe and reliable offshore ship-to-ship replenishment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A displacement measurement structure for offshore hoisting device of the utility model schematic view;

[0024] Figure 2 A measurement winch structure schematic view;

[0025] Figure 3 A measurement valve group schematic view;

[0026] Marked in the figure: 100, hoisting device;110, base;120, rotating structure;130, boom;140, luffing structure;150, steering structure;200, measurement winch;210, measurement motor;220, measurement valve group;221, throttle;222, balance valve;223, overflow valve;224, solenoid valve;230, measurement drum;240, measurement encoder;250, wall frame;300, replenishment winch;400, measurement weight;500, replenishment goods;600, replenishment ship;700, to be replenished ship. DETAILED DESCRIPTION

[0027] In order to deepen the understanding of the utility model, the utility model will be further described below in combination with examples and drawings, and the examples are only used to explain the utility model and do not constitute a limitation on the protection scope of the utility model.

[0028] Implementation example:

[0029] As Figure 1As shown, a displacement measurement structure for a marine lifting device is used in the lifting device 100 of a supply ship 600. A base 110 is fixed to the deck of the supply ship 600 as a support for the entire device. A rotating structure 120 is provided on the upper surface of the base 110. A boom 130 and a luffing structure 140 are connected to the upper end of the rotating structure 120. The rotating structure 120 and the luffing structure 140 adjust the position of the boom 130 in both horizontal and vertical directions. A supply winch 300 is installed on the boom. The device includes a measuring winch 200 and a steering structure 150 at the top of the boom 130. Ropes attached to the supply winch 300 and the measuring winch 200 travel along the boom 130 through the steering structure 150 and are connected to the supply cargo 500 and the measuring weight 400, respectively. After the measuring weight 400 is first released onto the deck of the ship to be supplied 200, the supply winch 300 adjusts its rotation speed based on feedback data from the measuring winch 200, smoothly transferring the supply cargo 500 to the ship to be supplied 600. The device utilizes a control system that provides electrical and hydraulic power to control the rotating structure 120 and the luffing structure 140, while simultaneously monitoring the operation of the measuring winch 200 and the supply winch 300 in real time.

[0030] The rotating structure 120 includes a rotating base and a rotating drive device. The rotating drive device, located on the upper surface of the rotating base, drives the rotating base to rotate relative to the base 110 in a horizontal range, thereby driving the boom 130, located on the upper surface of the rotating base, to rotate and adjust its orientation. The luffing structure 140 is a hydraulic structure. The luffing cylinder is connected to the rotating base, and a piston rod extends from the luffing cylinder and connects to the boom 130. The height of the boom 130 in the vertical direction is adjusted by extending and retracting the piston rod relative to the luffing cylinder. The steering structure 150 includes multiple steering pulleys through which the winch rope passes. After passing through the steering pulleys, the rope is connected to the object to be connected.

[0031] like Figure 2 As shown, the measuring winch 200 is fixed to the boom 130 via the wall frame 250. The rope is wound around the measuring drum 230 and extends along the boom 130 toward the steering structure 150. The measuring drum 230 is housed inside the hollow wall frame 250, with one end connected to the measuring motor 210 and the measuring valve group 220, and the other end connected to the measuring encoder 240. The measuring motor 210 rotates under the control of the measuring valve group 220, and forward and reverse rotation enables the measuring drum 230 to take in and release the rope.

[0032] The measuring motor 210 is the power output element of the measuring winch 200, controlling the raising and lowering of the measuring winch 200's rope. When the supply vessel 700 descends with the waves, the measuring motor 210 is in a passive towing state; when the supply vessel 700 rises with the waves, the measuring motor 210 is supplied with oil by the hydraulic system and is in an active lifting state. Figure 3As shown, in the measuring valve group 220, the throttle valve 221 is used to adjust the oil supply of the measuring motor 210, thereby controlling the lifting speed of the measuring winch 200; the balance valve 222 is used to lock the position of the hook of the measuring winch 200 to prevent the hook from slipping when it is suspended in the air; the solenoid valve 224 is responsible for opening and closing the overflow valve 223 under the control of the control system; the overflow valve 223 is used to set the overflow pressure, i.e. the constant tension of the measuring winch 200. When the wave compensation function is activated, the overflow valve is in the open state, and the measuring winch 200 is in the constant tension working mode. The overflow valve 223 is used to adjust the magnitude of the constant tension and maintain the constant tension.

[0033] When using, such as Figure 1 As shown, during ship-to-ship replenishment operations at sea, the device of this invention, installed on the replenishment vessel 600, lifts and transfers the replenishment cargo 500 from the deck of the replenishment vessel 600 to directly above the deck of the vessel to be replenished 200 via the rotation of the boom 130. At this time, the operator controls the measuring winch 200 via the control system to transfer the measuring weight on the hook to directly above the deck of the vessel to be replenished 200. The wave compensation function of the measuring winch 200 is activated, energizing the solenoid valve 224 in the measuring valve group 220, opening the overflow valve 223. Since the set pressure value of the overflow valve 223 is much lower than the pressure required to lift the measuring weight 400, the measuring motor 210 reverses, and the measuring weight 400 falls directly onto the deck. Simultaneously, the energized measuring winch 200 remains in the lifting state, ensuring that the measuring winch rope is always taut during wave compensation and automatically rises and falls with the vessel to be replenished 200 under the influence of waves with a constant tension. As the measuring winch rope moves with the waves, the measuring encoder 240 transmits the vertical displacement data of the waves to the control system in real time. The control system, after program processing and calculation by the CPU, sends a control signal to the motor proportional valve of the supply winch 300 to control the landing speed of the supply cargo 500 relative to the deck, thereby achieving wave compensation. When the supply operation is completed, the wave compensation function is canceled, the solenoid valve 224 is de-energized, the overflow valve 223 is closed, and the measuring winch 200 is operated to hoist the measuring weight back to the supply ship.

[0034] The device of this invention includes a supply winch 300 for loading and unloading cargo during supply operations, and a measuring winch 200 for measuring the relative displacement between the supply vessel 600 and the vessel to be supplied 200 during compensation operations. In existing ship-to-ship supply operations, the crane boom is typically rotated to be directly above the vessel to be supplied, and then the operators on the vessel to be supplied attach the measuring winch hook to the eyeplate of the vessel. Due to the influence of waves, the attitudes of the two vessels are difficult to control precisely, making it difficult to ensure that the measuring hook of the compensation crane is directly above the vessel being compensated during the preparation phase. Therefore, the measuring hook experiences oblique pull during operation, resulting in a large deviation in the measured displacement and affecting the compensation accuracy. Furthermore, supply operations are usually carried out in rough sea conditions, making it very difficult and dangerous for the operators on the vessel to be supplied to attach the measuring hook. The vessel to be supplied must have an eyeplate on its deck for attaching the measuring hook; cranes without eyeplates cannot perform supply operations, resulting in poor applicability. This invention uses measuring weights instead of the original measuring hooks, which are lowered vertically onto the deck of the supply vessel by their own weight, reducing the need for oblique pulling and improving measurement accuracy. It eliminates the need for personnel to hook the hooks, simplifying the operation process, and the supply vessel's deck does not require pre-installed eyeplates for attaching measuring hooks, making it highly versatile.

[0035] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A displacement measuring arrangement for a marine hoisting device, characterized in that, The application relates to a measurement winch and a supply winch arranged on a hoisting device of a supply ship and a control system. The measurement winch is connected with a measurement weight through a rope, and the supply winch is connected with supply goods through a rope. The measurement winch comprises a measurement motor, a measurement valve group for controlling the measurement motor, a measurement reel driven by the measurement motor, and a measurement encoder for monitoring the measurement winch in real time and feeding back information to the control system. The control system controls the lifting of the supply winch according to the information fed back by the measurement encoder.

2. Displacement measuring arrangement for a marine hoisting device according to claim 1, characterized in that, The measurement valve group comprises a throttle valve for adjusting the oil intake of the measurement motor, a balance valve for keeping load, an overflow valve for adjusting the constant tension of the measurement winch, and a solenoid valve for controlling the opening and closing of the overflow valve.

3. Displacement measuring arrangement for a marine hoisting device according to claim 2, characterized in that, The constant tension adjustment of the measurement winch is realized by setting the overflow pressure of the overflow valve. The control system realizes the opening and closing of the wave compensation function of the measurement winch by controlling the opening and closing of the solenoid valve.

4. Displacement measuring arrangement for a marine hoisting device according to claim 3, characterized in that, The set overflow pressure of the overflow valve is smaller than the weight of the measurement weight.

5. Displacement measuring arrangement for a marine hoisting device according to claim 1, characterized in that, The hoisting device comprises a base arranged on the deck of the supply ship, a rotating structure arranged on the base, a boom arranged on the rotating structure, and a steering structure arranged at the front end of the boom. The measurement winch and the supply winch are arranged on the boom, the rope of the measurement winch is connected with the measurement weight after passing through the steering structure, and the rope of the supply winch is connected with the supply goods after passing through the steering structure. The boom and the rotating structure are further connected with a luffing structure, and the luffing structure realizes the rotation of the boom relative to the rotating structure. The control system adjusts the state of the boom by controlling the rotating structure and the luffing structure.

6. Displacement measuring arrangement for a marine hoisting device according to claim 5, characterized in that, The rotating structure realizes the rotation of the boom relative to the base, and the boom is rotatably connected with the rotating structure. The rotating structure comprises a rotating base rotatably connected with the upper end face of the base and a rotating driving device, the boom is rotatably connected with the upper end face of the rotating base, and the rotating driving device drives the rotating base to rotate relative to the base, thereby realizing the horizontal rotation of the boom.

7. Displacement measuring arrangement for a marine hoisting device according to claim 6, characterized in that, The luffing structure is a hydraulic cylinder structure comprising a luffing cylinder and a piston rod, the luffing cylinder is fixedly connected with the rotating base, the extending end of the piston rod is connected with the boom, and the piston rod is telescopic relative to the luffing cylinder, thereby realizing the lifting of the boom.

8. Displacement measuring arrangement for a marine hoisting device according to claim 5, characterized in that, The steering structure comprises a plurality of steering wheels, and the ropes of the measurement winch and the supply winch are connected with the measurement weight and the supply goods respectively after being turned by the steering wheels.

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