A self-storage device and method for mooring constant tension

Abstract

The present invention relates to the technical field of ship mooring system, and discloses a self-storage device and method for mooring constant tension, comprising a hydraulic cylinder; a piston pull rod of the hydraulic cylinder is connected to one end of a cable; an energy storage module; the energy storage module comprises a No. 1 accumulator and a No. 2 accumulator, the volume of the No. 2 accumulator is greater than the volume of the No. 1 accumulator, and the maximum pressure of the No. 1 accumulator is set to be greater than the maximum pressure of the No. 2 accumulator; the No. 1 accumulator and the No. 2 accumulator are respectively connected to the oil chamber of the hydraulic cylinder through a hydraulic pipeline; the No. 1 accumulator and the No. 2 accumulator are connected through a hydraulic pipeline; the pressure in the hydraulic cylinder is adjusted by adjusting the amount of hydraulic oil in the hydraulic cylinder through the No. 1 accumulator and the No. 2 accumulator, so that the tension in the cable is constant within a preset value during operation. The present invention solves the problem of additional energy consumption for providing constant tension for ship mooring, insufficient cable tension and elongation by storing the self-generated energy of the ship's movement.

Description

Technical Field

[0001] The present invention relates to the technical field of ship mooring systems, and in particular to a self-energy storage device and method for constant tension mooring. Background Art

[0002] With the increasing size of ships, the safety of ship mooring has become one of the important factors that constitute ship accidents and risks. Ship mooring mainly relies on the configuration and control of cables, cable winches, mooring piles, cable holes, guide rollers and other equipment. After the ship becomes larger, the power required to control these devices is very large, and different control methods and capabilities have very different adjustment ranges for these forces. Reasonable equipment and mooring solutions can more reasonably control these forces and reduce the risks and accidents of ships during mooring.

[0003] The equipment used by ships to control the force on cables is mainly mooring winches and bollards.

[0004] Among them, the force on the cable controlled by the mooring winch can be divided into three types: "manual", that is, the cable crane brake pads are used to brake the cable, and the force generated is hereinafter referred to as "brake force"; "automatic", that is, the oil pump constant tension is used to control the cable to maintain a certain tension, and the force generated is hereinafter referred to as "constant tension"; and the force generated during the manual adjustment of the cable is called "cable car winch force".

[0005] Compared with the other three, the size of "constant tension" is determined by the oil pump and can be adjusted by adjusting the output power of the oil pump; the characteristics of "constant tension" are: when the ship is stationary, constant tension is provided to the cable, and when the ship moves forward and backward and outward, the cable length is adjusted to keep the ship stable.

[0006] The existing methods for providing constant tension to cables are mostly to provide energy externally, that is, to use a hydraulic pump station. This method requires additional consumption of fuel or electricity. At the same time, the hydraulic pump station will also generate noise and vibration when working, which will affect the environment.

[0007] In addition, since the existing constant tension system is designed with a certain adjustment range, and the response speed is insufficient due to the lag effect of the hydraulic system's controller and sensor, when the ship's movement or external force changes exceed this range, the system may not be able to adjust the cable tension and length in a timely and effective manner.

[0008] Therefore, it is necessary to design a method and equipment that can automatically store and utilize ship energy, so that the cable can have a large elongation (2-3 meters) and maintain stable tension when subjected to a large force (30-50 tons), while also reducing energy consumption. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a self-energy storage device and method for constant tension in mooring, which solves the problems of additional energy consumption, insufficient cable tension and elongation in providing constant tension for ship mooring by storing the energy generated by the movement of the ship.

[0010] In a first aspect, the first object of the present invention is to provide a self-energy storage device for mooring constant tension, comprising:

[0011] A hydraulic cylinder; a piston pull rod of the hydraulic cylinder is connected to one end of the cable;

[0012] Energy storage module; the energy storage module includes a No. 1 accumulator and a No. 2 accumulator, the volume of the No. 2 accumulator is greater than the volume of the No. 1 accumulator, and the maximum pressure of the No. 1 accumulator is set to be greater than the maximum pressure of the No. 2 accumulator;

[0013] The first accumulator and the second accumulator are connected to the oil chamber of the hydraulic cylinder through hydraulic pipelines respectively; the first accumulator and the second accumulator are connected to each other through hydraulic pipelines;

[0014] The pressure in the hydraulic cylinder is adjusted by adjusting the amount of hydraulic oil in the hydraulic cylinder through the No. 1 accumulator and the No. 2 accumulator, so that the tension in the cable is constant within a preset value during operation.

[0015] Furthermore, the energy storage module further includes:

[0016] A No. 1 one-way valve is arranged between the No. 1 accumulator and the hydraulic cylinder, and is used to control whether the hydraulic oil in the oil chamber is transmitted to the No. 1 accumulator;

[0017] A No. 2 check valve, disposed between the No. 2 accumulator and the hydraulic cylinder, for controlling whether the hydraulic oil in the No. 2 accumulator is transmitted to the oil chamber;

[0018] A No. 1 relief valve is provided on the hydraulic pipeline between the No. 1 accumulator and the No. 2 accumulator and is used to control the maximum pressure in the No. 1 accumulator;

[0019] A No. 2 relief valve, connected to the No. 2 accumulator through a hydraulic pipeline, for controlling the maximum pressure in the No. 2 accumulator;

[0020] The oil tank is connected to the No. 2 relief valve and is used to store the hydraulic oil from the No. 2 accumulator.

[0021] Furthermore, it also includes:

[0022] A No. 3 one-way valve is arranged on the hydraulic pipeline between the oil tank and the oil chamber, and the No. 3 one-way valve is used to control whether the hydraulic oil in the oil tank is transmitted to the oil chamber.

[0023] Furthermore, a No. 3 overflow valve is provided on the hydraulic pipeline between the No. 2 accumulator and the oil chamber, and the No. 3 overflow valve is used to stabilize the pressure at the outlet of the No. 2 accumulator.

[0024] Furthermore, the No. 1 relief valve is a pilot-operated relief valve, and the No. 2 relief valve is a direct-acting relief valve.

[0025] Furthermore, the device is fixed on the ship by bolts.

[0026] In a second aspect, a second object of the present invention is to provide a self-energy storage method for mooring constant tension, comprising:

[0027] S1. Connect the hydraulic cylinder and the cable and install the device on a ship;

[0028] S2. When the cable is stretched, the piston rod moves outward, and the hydraulic oil enters the No. 1 accumulator from the oil chamber;

[0029] S3. If the cable does not continue to stretch, proceed to S4; if the cable continues to stretch, when the pressure in accumulator No. 1 reaches the set maximum pressure, the hydraulic oil enters accumulator No. 2 from accumulator No. 1 for storage, and the cable tension is the first preset value; if the pressure in accumulator No. 2 reaches the set maximum pressure, the hydraulic oil enters the oil tank from accumulator No. 2.

[0030] S4, when the cable contracts, the piston rod moves inward, and the hydraulic oil enters the oil chamber from the No. 2 accumulator;

[0031] S5. If the cable does not continue to retract, directly proceed to S6; if the cable continues to retract, when there is no hydraulic oil in the No. 2 accumulator, the hydraulic oil in the oil chamber enters the oil tank;

[0032] S6. Repeat the process of S2-S5 in a loop.

[0033] Furthermore, the S3 further includes:

[0034] If the pressure in the No. 2 accumulator reaches the set maximum pressure, the hydraulic oil flows from the No. 2 accumulator into the oil tank.

[0035] The embodiments of the present invention have the following technical effects:

[0036] The present application sets the No. 1 accumulator as a high-pressure accumulator, sets the No. 2 accumulator as a low-pressure accumulator, and sets a one-way valve, a relief valve, etc. to facilitate the energy interaction between the hydraulic cylinder and the two accumulators, so as to store the energy generated by the movement of the berthed ship itself; and the maximum tension of the cable when stretched can be determined by setting the maximum pressure value in the No. 1 accumulator, and the maximum tension of the cable when retracted can be determined by setting the maximum pressure value in the No. 2 accumulator, so as to better meet the actual needs;

[0037] When the cable is subjected to a large force, the No. 1 accumulator can maintain a stable small change in tension, and the cable will also have a large extension, making the ship more stable when moored; and when the cable is loosened, the No. 2 accumulator will provide a tension to the cable to prevent unstable shaking caused by instantaneous complete relaxation;

[0038] Using the ship's own energy to supply energy reduces the energy loss of the hydraulic system when transmitting and converting energy, improves the overall energy efficiency, and can achieve more environmentally friendly and sustainable energy utilization. It does not require external energy such as hydraulic pump stations, reduces the maintenance requirements of hydraulic pump stations, reduces environmental pollution, and does not cause noise and vibration when hydraulic pump stations are working;

[0039] In addition, in some special environments (such as remote areas and polar regions), it may be difficult to obtain external energy. This application can enhance the adaptability of ships when moored in these environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a structural schematic diagram of a self-energy storage device for mooring constant tension provided by an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of the structure of a No. 1, No. 2 or No. 3 one-way valve provided in an embodiment of the present invention;

[0043] Figure 3 A schematic structural diagram of a pilot-operated relief valve provided in an embodiment of the present invention;

[0044] Figure 4 A schematic structural diagram of a direct-acting relief valve provided in an embodiment of the present invention;

[0045] Figure 5 A schematic diagram of the structure of a hydraulic cylinder provided in an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of the structure of a No. 1 accumulator or a No. 2 accumulator provided in an embodiment of the present invention;

[0047] Figure 7 A schematic diagram of the change in tension of a cable provided by an embodiment of the present invention as it fluctuates with waves;

[0048] In the figure, 101 is accumulator No. 1; 102 is accumulator No. 2; 201 is check valve No. 1; 202 is check valve No. 2; 203 is check valve No. 3; 301 is overflow valve No. 1; 302 is overflow valve No. 2; 4 is oil chamber; 5 is piston rod; 6 is oil tank. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0050] Example 1

[0051] First, explain the following:

[0052] See also Figure 5 The hydraulic cylinder is an actuator in the hydraulic system that can convert hydraulic energy into mechanical energy. It includes a sealed oil chamber formed by a steel cylinder and a cylinder head, a piston rod displaced in the oil chamber, and an exhaust device.

[0053] See also Figure 3 The pilot-operated relief valve consists of two parts: the main valve and the pilot valve. The main valve is a valve that is opened and closed by the medium pressure, while the pilot valve controls the opening and closing of the main valve by the pressure change in the pilot oil circuit. The pilot oil circuit consists of two control ports and a pilot chamber, and the structure is relatively complex. When the medium pressure is lower than the set valve pressure, the valve is closed and the medium cannot flow through the valve; when the medium pressure reaches the set valve pressure, the pilot valve opens first, and the opening of the main valve is controlled by the pressure change in the pilot oil circuit, and the medium can flow through. When the medium pressure decreases, the pressure in the pilot oil circuit also decreases, and the main valve closes. This working principle makes the pilot-operated relief valve have the characteristics of fast response and stable performance.

[0054] See also Figure 4 The direct-acting relief valve is mainly composed of a valve body and a valve core. There is an adjustment hole and an adjustment screw inside the valve body. The pressure of the pressure regulating spring is changed by adjusting the screw, and then the displacement of the valve core is adjusted to control the flow rate. The overflow volume is controlled by adjusting the displacement of the valve core. When the pressure oil enters the valve body, the pressure acts on the valve core. When the pressure exceeds the force applied by the adjusting screw, the valve core opens and the oil flows out of the overflow hole to achieve pressure regulation. When the pressure decreases, the spring on the adjusting screw closes the valve core.

[0055] See also Figure 6The main function of the accumulator is to convert the energy in the system into compression energy or potential energy and store it at the appropriate time. When the system needs it, the energy will be released in the form of hydraulic pressure or pneumatic pressure to replenish the system energy.

[0056] Figure 1 The present invention provides a self-storage device for mooring constant tension. Figure 1 , the device of the present application comprises:

[0057] Hydraulic cylinder; the piston rod 5 of the hydraulic cylinder is connected to one end of the cable, and as the tension in the cable changes, the piston rod 5 is stretched or retracted accordingly; it should be noted that the piston rod 5 in the hydraulic cylinder has the function of automatic return.

[0058] Energy storage module; the energy storage module includes an accumulator No. 101 and an accumulator No. 2 102, the volume of the accumulator No. 2 102 is greater than the volume of the accumulator No. 1 101, and the maximum pressure of the accumulator No. 1 101 is set to be greater than the maximum pressure of the accumulator No. 2 102; relatively speaking, the accumulator No. 1 101 can be regarded as a high-pressure accumulator, and the accumulator No. 2 102 can be regarded as a low-pressure accumulator.

[0059] The accumulator No. 101 and the accumulator No. 2 102 are connected to the oil chamber 4 of the hydraulic cylinder through hydraulic pipelines respectively; the accumulator No. 101 and the accumulator No. 2 102 are connected through hydraulic pipelines; the pressure in the hydraulic cylinder is adjusted by adjusting the amount of hydraulic oil in the hydraulic cylinder through the accumulator No. 101 and the accumulator No. 2 102, so that the tension in the cable is constant within a preset value during operation.

[0060] When the ship is moored, the shaking of the ship causes the cable to stretch and contract repeatedly, and this cycle is relatively short, so the capacity of the No. 1 accumulator 101 is smaller, so that when the cable is stretched, the tension can quickly reach the maximum, and energy can be repeatedly transmitted to the No. 2 accumulator 102; the volume of the No. 2 accumulator 102 is larger, so its ability to smooth pressure fluctuations is stronger, which can slowly reduce the tension of the cable and avoid drastic fluctuations in the pressure in the oil chamber 4.

[0061] In this application, tension is calculated using the following formula:

[0062] ,

[0063] Among them, P represents the pressure in the oil chamber, and S represents the piston surface area of ​​the piston rod. S is a constant value. Obviously, as long as P is kept constant, the tension will be constant.

[0064] Based on the above principle, when the self-storage device is working, see Figure 7The cable stretches or retracts with the fluctuations of the waves, thereby driving the piston rod 5 to repeatedly stretch and retract. The maximum pressure of the No. 1 accumulator 101 is relatively large, and it mainly receives the hydraulic oil from the oil chamber 4 when the cable is stretched, reduces the pressure in the oil chamber 4 and stabilizes it near the maximum pressure of the No. 1 accumulator 101, so that the tension in the cable is maintained near the first preset value F1; while the maximum pressure of the No. 2 accumulator 102 is relatively small, and it mainly outputs hydraulic oil when the cable contracts, increases the pressure in the oil chamber 4 and stabilizes it near the maximum pressure of the No. 2 accumulator 102, so that the tension in the cable is maintained near the second preset value F2; the device as a whole can play the role of storing energy, thereby achieving the purpose of self-power supply.

[0065] It should be noted that the maximum pressures of accumulator No. 101 and accumulator No. 2 102 can be set according to actual needs, so the maximum tension when the cable is stretched is maintained at the tension corresponding to the pressure set in accumulator No. 101, that is, near the first preset value F1. Similarly, the maximum tension when the cable is contracted is maintained at the tension corresponding to the pressure set in accumulator No. 2 102, that is, near the second preset value F2.

[0066] When the piston rod 5 is continuously retracted, that is, when the cable is not working, the tension will gradually decrease from F2 to 0. Figure 7 On the basis of the above, the tension has stable small changes during the stretching or retraction process, which is caused by the structural limitations of the accumulator, valve, etc., but the range of change is small and does not affect the overall tension change trend.

[0067] Example 2

[0068] Based on the device in Example 1, a self-energy storage method for mooring constant tension is provided, comprising the following steps:

[0069] S1. Connect the hydraulic cylinder and the cable and install the device on a ship;

[0070] S2, when the cable is stretched, the piston rod 5 moves outward, and the hydraulic oil enters the No. 1 accumulator 101 from the oil chamber 4;

[0071] S3. If the cable does not continue to stretch, proceed to S4; if the cable continues to stretch, when the pressure in accumulator No. 101 reaches the set maximum pressure, the hydraulic oil enters accumulator No. 2 102 from accumulator No. 101 for storage, and the cable tension is a first preset value; if the pressure in accumulator No. 2 102 reaches the set maximum pressure, the hydraulic oil enters the oil tank from accumulator No. 2 102.

[0072] S4, when the cable contracts, the piston rod 5 moves inward, and the hydraulic oil enters the oil chamber 4 from the No. 2 accumulator 102;

[0073] S5. If the cable does not continue to shrink, directly proceed to S6; if the cable continues to shrink, when there is no hydraulic oil in the No. 2 accumulator 102, the hydraulic oil in the oil chamber 4 enters the oil tank 6;

[0074] S6. Repeat the process of S2-S5 in a loop.

[0075] Example 3

[0076] Based on the content of embodiment 1, the energy storage module further includes:

[0077] The first check valve 201 is arranged between the first accumulator 101 and the hydraulic cylinder, and is used to control whether the hydraulic oil in the oil chamber 4 is transmitted to the first accumulator 101; see Figure 2 When the pressure in the oil chamber 4 is greater than the pressure in the No. 1 accumulator 101, the No. 1 check valve 201 is turned on and acts.

[0078] The No. 2 one-way valve 202 is arranged between the No. 2 accumulator 102 and the hydraulic cylinder, and is used to control whether the hydraulic oil in the No. 2 accumulator 102 is transmitted to the oil chamber 4; when the pressure in the oil chamber 4 is lower than the pressure in the No. 2 accumulator 102, the No. 2 one-way valve 202 is turned on and acts.

[0079] The No. 1 relief valve 301 is arranged on the hydraulic pipeline between the No. 1 accumulator 101 and the No. 2 accumulator 102, and is used to control the maximum pressure P1 in the No. 1 accumulator 101; the No. 1 relief valve is selected as a pilot relief valve according to the effect of the No. 1 relief valve, and the pressure of the pilot relief valve is first set by adjusting the nut. When the pressure received by the pilot relief valve at one end of the No. 1 accumulator 101 is greater than the set pressure, the pilot relief valve is turned on; the No. 1 relief valve can be set according to actual needs.

[0080] The No. 2 relief valve 302 is connected to the No. 2 accumulator 102 through a hydraulic pipeline, and is used to control the maximum pressure in the No. 2 accumulator 102; the No. 2 relief valve can be a direct-acting relief valve, which is more suitable for low-pressure and small-flow situations and has higher sensitivity; the No. 2 relief valve can be set according to actual needs.

[0081] The oil tank 6 is connected to the No. 2 overflow valve 302 and is used to store the hydraulic oil from the No. 2 accumulator 102. By setting up an external oil tank, hydraulic oil is provided to the oil chamber 4 to be replenished when the pressure of the No. 2 accumulator 102 and the oil chamber 4 is unbalanced.

[0082] A No. 3 one-way valve 203 is provided on the hydraulic pipeline between the oil tank 6 and the oil chamber 4 . The No. 3 one-way valve 203 is used to control whether the hydraulic oil in the oil tank 6 is transmitted to the oil chamber 4 .

[0083] A No. 3 overflow valve is provided on the hydraulic pipeline between the No. 2 accumulator 102 and the oil chamber 4. The No. 3 overflow valve is used to stabilize the pressure at the outlet of the No. 2 accumulator 102. When the tension in the cable is less than a certain value, the No. 3 check valve 203 opens and the No. 2 check valve is closed, which can make the energy storage effect of the No. 2 accumulator 102 more obvious.

[0084] The present application sets two accumulators connected to the hydraulic cylinder, and the accumulators store energy through the hydraulic principle. The two accumulators are set with different volumes and different maximum pressures through the overflow valve to store the energy generated by the movement of the ship, and ensure that the tension in the cable remains constant during the extension and retraction process without external energy supply.

[0085] Based on the above device structure, the actual use process includes the following steps:

[0086] (1) Connecting the hydraulic cylinder to the cable and installing the device on a ship;

[0087] (2) When the cable is stretched, the piston rod moves outward, the oil pressure on the oil chamber side of the No. 1 check valve 201 is greater than the oil pressure on the No. 1 accumulator side, the No. 1 check valve 201 is turned on, and the hydraulic oil enters the No. 1 accumulator 101;

[0088] The cable continues to stretch, the pulling force gradually increases, the tension gradually increases, and the hydraulic oil in the No. 1 accumulator 101 increases to the set maximum pressure P1. At this time, the cable continues to stretch, and the hydraulic oil continues to be transmitted from the oil chamber 4 to the No. 1 accumulator 101; the No. 1 relief valve 301 is turned on, and the hydraulic oil in the No. 1 accumulator 101 enters the No. 2 accumulator 102. At this time, the total amount of hydraulic oil in the No. 1 accumulator 101 remains unchanged, and the tension in the cable is F1.

[0089] The cable continues to be stretched, and can be stretched to the maximum until the hydraulic oil fills the No. 2 accumulator 102, so that the No. 2 accumulator 102 reaches the set maximum pressure P2; if the pressure in the No. 2 accumulator 102 exceeds the set maximum pressure, the No. 2 relief valve 302 is turned on, and the hydraulic oil enters the oil tank 6, so that the total amount of hydraulic oil in the No. 2 accumulator 102 remains unchanged. At this time, the tension in the cable is still F1.

[0090] (3) When the cable begins to contract, the piston rod 5 automatically moves inward. At this time, the oil pressure on the oil chamber side of the No. 1 check valve 201 is less than the oil pressure on the No. 1 accumulator side, and the No. 1 check valve 201 is closed. At this time, the oil pressure in the No. 1 accumulator 101 is constant at around P1, and the No. 1 relief valve 301 is closed. Similarly, the No. 2 relief valve 302 is closed; while the oil pressure on the oil chamber side of the No. 2 check valve 202 is less than the oil pressure on the No. 2 accumulator 102 side, the No. 2 check valve 202 is turned on, and the hydraulic oil enters the oil chamber 4 from the No. 2 accumulator 102;

[0091] At this time, the tension is F2, and the hydraulic oil in the oil tank 6 will not enter the oil chamber 4, because the pressure in the second accumulator 102 is greater than the pressure in the oil tank 6. The tension is F2 at this time; the pressure in the oil tank 6 is the air pressure. The amount of hydraulic oil in the oil tank 6 is greater than the amount of hydraulic oil required for the piston rod 5 to be fully retracted in the oil chamber 4, and the basic oil level in the oil tank must be met, which can be approximately 2 to 3 times the amount of hydraulic oil required for the piston rod 5 to be fully retracted.

[0092] The cable continues to contract, the oil pressure in the No. 2 accumulator 102 decreases, and the tension in the cable gradually becomes less than F2, until the hydraulic pressure in the No. 2 accumulator 102 is less than or equal to the hydraulic pressure in the oil chamber 4, then the No. 2 check valve 202 is closed, and the hydraulic oil in the oil tank 6 continues to flow into the oil chamber to compensate for the negative pressure generated in the oil chamber; or the cable is directly stretched to enter the next step (4).

[0093] It should be noted that when a No. 3 overflow valve is provided, when the tension in the cable is less than a set value, the No. 2 check valve 202 is in a closed state, and the No. 3 check valve 203 is in an open state. When the tension in the cable is greater than the set value, the No. 3 overflow valve and the No. 2 check valve 202 are opened, allowing the hydraulic oil in the No. 2 accumulator 102 to enter the oil chamber 4.

[0094] (4) When the cable is stretched again, the piston rod moves outward, and the oil pressure in the oil chamber 4 decreases.

[0095] The oil pressure on the oil chamber side of the No. 1 one-way valve 201 is greater than the oil pressure on the No. 1 accumulator side, the No. 1 one-way valve 201 is turned on, and the hydraulic oil enters the No. 1 accumulator 101. At this time, the hydraulic pressure in the No. 1 accumulator 101 is close to F1, so the No. 1 relief valve 301 is turned on, and the hydraulic oil enters the No. 2 accumulator 102 from the No. 1 accumulator 101; if the hydraulic pressure in the No. 2 accumulator 102 is close to F2, the No. 2 relief valve 302 is turned on, and the hydraulic oil enters the oil tank 6. At this time, the tension in the cable is F1.

[0096] (5) When the cable retracts again, enter (2).

[0097] Based on the above technical solution, the present application solves the problems of additional energy consumption for providing constant tension for ship mooring and insufficient cable tension and elongation by storing the energy generated by the ship's movement.

[0098] It should be noted that the terms used in the present invention are only for describing specific embodiments, rather than limiting the scope of the present application. As shown in the present specification, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0099] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A self-storage device for constant tension mooring, characterized in that: include: A hydraulic cylinder; a piston pull rod (5) of the hydraulic cylinder is connected to one end of the cable; An energy storage module; the energy storage module comprises a No. 1 energy storage device (101) and a No. 2 energy storage device (102); the volume of the No. 2 energy storage device (102) is greater than the volume of the No. 1 energy storage device (101); and the maximum pressure of the No. 1 energy storage device (101) is set to be greater than the maximum pressure of the No. 2 energy storage device (102); The first accumulator (101) and the second accumulator (102) are respectively connected to the oil chamber (4) of the hydraulic cylinder via a hydraulic pipeline; the first accumulator (101) and the second accumulator (102) are connected via a hydraulic pipeline; The pressure in the hydraulic cylinder is adjusted by adjusting the amount of hydraulic oil in the hydraulic cylinder through the first accumulator (101) and the second accumulator (102), so that the tension in the cable is constant near a preset value during operation; Wherein, the energy storage module further includes: A No. 1 one-way valve (201), arranged between the No. 1 accumulator (101) and the hydraulic cylinder, and used to control whether the hydraulic oil in the oil chamber (4) is transmitted to the No. 1 accumulator (101); A second one-way valve (202) is disposed between the second accumulator (102) and the hydraulic cylinder and is used to control whether the hydraulic oil in the second accumulator (102) is transmitted to the oil chamber (4); A No. 1 overflow valve (301), arranged on a hydraulic pipeline between the No. 1 accumulator (101) and the No. 2 accumulator (102), for controlling the maximum pressure in the No. 1 accumulator (101); A No. 2 overflow valve (302), connected to the No. 2 accumulator (102) via a hydraulic pipeline, and used for controlling the maximum pressure in the No. 2 accumulator (102); The oil tank (6) is connected to the No. 2 overflow valve (302) and is used to store the hydraulic oil from the No. 2 accumulator (102).

2. A self-storage device for constant tension in mooring according to claim 1, characterized in that: Also includes: A No. 3 one-way valve (203) is arranged on the hydraulic pipeline between the oil tank (6) and the oil chamber (4), and the No. 3 one-way valve (203) is used to control whether the hydraulic oil in the oil tank (6) is transmitted to the oil chamber (4).

3. A self-storage device for constant tension in mooring according to claim 1, characterized in that: A No. 3 overflow valve is provided on the hydraulic pipeline between the No. 2 accumulator (102) and the oil chamber (4), and the No. 3 overflow valve is used to stabilize the pressure at the outlet of the No. 2 accumulator (102).

4. A self-storage device for constant tension in mooring according to claim 1, characterized in that: The No. 1 relief valve (301) is a pilot-operated relief valve, and the No. 2 relief valve (302) is a direct-acting relief valve.

5. A self-storage device for constant tension in mooring according to claim 1, characterized in that: The device is fixed on the vessel by bolts.

6. A self-storage method for mooring constant tension, implemented based on the device according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1. Connect the hydraulic cylinder and the cable and install the device on a ship; S2. When the cable is stretched, the piston rod (5) moves outward, and the hydraulic oil enters the No. 1 accumulator (101) from the oil chamber (4); S3, if the cable does not continue to stretch, proceed to S4; if the cable continues to stretch, when the pressure in the No. 1 accumulator (101) reaches the set maximum pressure, the hydraulic oil flows from the No. 1 accumulator (101) into the No. 2 accumulator (102) for storage, and the cable tension is a first preset value; if the pressure in the No. 2 accumulator (102) reaches the set maximum pressure, the hydraulic oil flows from the No. 2 accumulator (102) into the oil tank; S4, when the cable is retracted, the piston rod (5) moves inward, and the hydraulic oil enters the oil chamber (4) from the No. 2 accumulator (102); S5. If the cable does not continue to retract, proceed directly to S6. If the cable continues to retract, when there is no hydraulic oil in the No. 2 accumulator (102), the hydraulic oil in the oil chamber (4) enters the oil tank (6). S6. Repeat the process of S2-S5 in a loop.

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