Anchor gear and cargo hold cover hydraulic merging system

Abstract

The invention discloses a hydraulic merging system for an anchor gear and a cargo hold cover, and relates to the technical field of ships. The hydraulic merging system comprises the following steps: S1, arranging a pipeline between a hydraulic pump station and the anchor gear; s2, arranging a pipeline between the hydraulic pump station and the cargo hold cover; s3, the hydraulic pump station works; s4, arranging a pressure sensor; s5, performing real-time leakage detection and leakage position calculation; and S6, estimating the leakage degree. According to the hydraulic combination system for the anchor gear and the cargo hold cover, the anchor gear and the cargo hold cover can be controlled by adopting the same hydraulic system to be equipped with corresponding pressure reduction accessories, so that the ship building and operating cost is saved, the arrangement space is saved, and fire-fighting and alarm systems corresponding to a mechanical place are reduced; and the leakage condition of the pipeline can be detected in real time through the pressure sensor, and the leakage position and the leakage degree can be calculated at the first time, so that workers are timely notified to make preparation work for pre-maintenance according to the leakage position and the leakage degree.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, in particular to a hydraulic combined system of an anchor windlass and a cargo hatch cover. Background Art

[0002] In ships, anchor windlasses are not only tools for raising and lowering anchors, but also the core guarantee of ship safety. They integrate power, control and safety systems to adapt to diverse navigation needs and ensure the stability and safety of ships during mooring and emergency situations. Marine cargo hatch covers are not only the "guardians" of cargo safety, but also the key to efficient ship operations. However, since the operating parameters of the hydraulic drive system used by anchor windlasses are much higher than those of cargo hatch covers, anchor windlasses and cargo hatch covers are each equipped with a hydraulic drive system, which increases costs and greatly occupies the internal space of the ship. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a hydraulic combined system of an anchor winch and a cargo hatch cover, which solves the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a windlass and cargo hatch cover hydraulic integration system, the windlass and cargo hatch cover hydraulic integration system comprising the following steps:

[0005] S1. Pipeline layout between hydraulic pump station and anchor winch;

[0006] S2. Pipeline layout between the hydraulic pump station and the cargo hatch cover;

[0007] S3, hydraulic pump station operation;

[0008] S4, pressure sensor layout;

[0009] S5, real-time leak detection and leak location calculation;

[0010] S6. Estimation of leakage extent.

[0011] Furthermore, in step S1, the pipeline layout between the hydraulic pump station and the anchor windlass:

[0012] The oil inlet of the hydraulic pump station is connected to the oil inlet of the anchor windlass through a pressure pipe and a pipeline stop valve, while the oil return port of the hydraulic pump station is connected to the oil return port of the anchor windlass through a return oil pipe and a return oil pipe check valve.

[0013] Furthermore, in step S2, the pipeline layout between the hydraulic pump station and the cargo hatch cover is as follows:

[0014] The pressure pipe connected to the oil inlet of the hydraulic pump station is connected to the oil inlet of each cargo hatch cover through a pipeline stop valve on its branch away from the anchor windlass, and the oil return port of the hydraulic pump station is connected to the oil return port of each cargo hatch cover through a return pipe stop valve on its branch away from the anchor windlass;

[0015] S3, Hydraulic pump station operation:

[0016] By starting the hydraulic pump station and switching the corresponding valve on the pressure pipe, the hydraulic oil flows along the pressure pipe into the windlass or the corresponding cargo hatch cover, thereby opening the cargo hatch cover or starting the windlass. By switching the corresponding valve on the return oil pipe, the hydraulic oil returns to the hydraulic pump station along the return oil pipe, thereby closing the corresponding windlass or cargo hatch cover.

[0017] Furthermore, in step S2, the return oil pipe arranged between the oil return port of the hydraulic pump station and the oil return ports of each cargo hatch cover and the pressure pipe arranged between the oil inlet of the hydraulic pump station and the oil inlet of each cargo hatch cover are connected through a bypass high-pressure shut-off valve.

[0018] Furthermore, in step S4, the pressure sensor is arranged:

[0019] Pressure sensors are installed at both ends of each section of the pressure pipe and the oil return pipe, that is, at the connection between the pipes.

[0020] Furthermore, in step S4, each pressure sensor has a unique number, and two pressure sensors adjacently distributed along the pipeline correspond to the pipeline therebetween.

[0021] Furthermore, the step S5, real-time leakage detection and leakage position calculation:

[0022] If a pipeline leaks, a pressure transient wave will be generated. This wave propagates to both ends of the pipeline at the speed of sound c. The location of the leak point can be calculated by recording the time difference Δt between the upstream and downstream pressure sensors detecting the pressure mutation:

[0023]

[0024] Furthermore, in step S5, L represents the length of the pipeline between the two pressure sensors on the pipeline;

[0025] The time difference is calculated as:

[0026] Δt=t1-t2

[0027] The pressure signal is monitored in real time, and the pressure mutation moments t1 and t2 are identified through signal processing algorithms such as wavelet transform and Fourier transform. t1 is the time when the upstream pressure sensor senses the pressure transient wave, and t2 is the time when the downstream pressure sensor senses the pressure transient wave.

[0028] The pressure wave propagation velocity c in the pipeline is pre-calibrated based on the pipeline material and fluid properties. Therefore, by substituting the above known parameters into the formula for calculating the leak point, the distance x from the leak point to the upstream sensor can be calculated.

[0029] Furthermore, in step S6, leakage degree estimation:

[0030] When a pipeline leak is detected, the overall pressure will drop due to the pipeline leak. Before the pressure reaches a new balance, the pressure decay rate per unit time is monitored. Combining the pipe volume and fluid compressibility, estimate the leakage:

[0031]

[0032] Where V is the volume of the fluid in the pipe, β is the bulk elastic modulus of the fluid, and g is the acceleration due to gravity.

[0033] Furthermore, in step S6, the volume of the fluid in the pipeline can be directly calculated based on the pipeline inner diameter d and length L because the pipeline is a regular cylindrical tube. The specific formula is as follows:

[0034]

[0035] Since hydraulic oil is a common fluid, the bulk elastic modulus of the hydraulic oil can be directly obtained by looking up the table. The specific bulk elastic modulus of the hydraulic oil is (1.4-2.0)×10 9 Pa.

[0036] The present invention provides a hydraulic combined system of an anchor winch and a cargo hatch cover, which has the following beneficial effects:

[0037] The combined hydraulic system for the windlass and cargo hatch cover uses the same hydraulic system equipped with corresponding pressure reducing accessories to control both the windlass and cargo hatch cover, thereby saving ship construction and operating costs, saving layout space, and eliminating the need for corresponding fire protection and alarm systems in a machinery space. Furthermore, pressure sensors at both ends of each pipe section can be used to detect pipe leaks in real time, and the leak location and extent can be calculated immediately in the event of a leak, so that timely response can be taken and staff can be notified to make advance repair preparations based on the leak location and extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the layout of a hydraulic combined system of an anchor windlass and a cargo hatch cover according to the present invention;

[0039] Figure 2 The invention provides a hydraulic combined system of an anchor windlass and a cargo hatch cover. Figure 1 The logo in the middle indicates an enlarged schematic diagram;

[0040] Figure 3 The present invention is a schematic flow chart of a hydraulic combined system of an anchor windlass and a cargo hatch cover. DETAILED DESCRIPTION

[0041] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0042] like Figure 1-Figure 3 As shown, the present invention provides a technical solution: a windlass and cargo hatch cover hydraulic integration system, the windlass and cargo hatch cover hydraulic integration system comprising the following steps:

[0043] S1. Pipeline layout between hydraulic pump station and anchor winch:

[0044] The oil inlet of the hydraulic pump station is connected to the oil inlet of the anchor windlass through a pressure pipe and a pipeline stop valve, while the oil return port of the hydraulic pump station is connected to the oil return port of the anchor windlass through a return pipe and a return pipe check valve;

[0045] S2. Pipeline layout between the hydraulic pump station and the cargo hatch cover:

[0046] The pressure pipe connected to the oil inlet of the hydraulic pump station is connected to the oil inlet of each cargo hatch cover through a pipeline stop valve on its branch away from the anchor windlass, and the oil return port of the hydraulic pump station is connected to the oil return port of each cargo hatch cover through a return pipe stop valve on its branch away from the anchor windlass;

[0047] The oil return pipe arranged between the oil return port of the hydraulic pump station and the oil return port of each cargo hatch cover and the pressure pipe arranged between the oil inlet of the hydraulic pump station and the oil inlet of each cargo hatch cover are connected through a bypass high-pressure shut-off valve;

[0048] S3, Hydraulic pump station operation:

[0049] By starting the hydraulic pump station and opening and closing the corresponding valve on the pressure pipe, the hydraulic oil flows along the pressure pipe into the windlass or the corresponding cargo hatch cover, thereby opening the cargo hatch cover or starting the windlass. By opening and closing the corresponding valve on the return oil pipe, the hydraulic oil flows back to the hydraulic pump station along the return oil pipe, thereby closing the corresponding windlass or cargo hatch cover.

[0050] S4. Pressure sensor layout:

[0051] Pressure sensors are installed at both ends of each section of the pressure pipe and the return oil pipe, i.e. at the connection between the pipes;

[0052] Each pressure sensor has a unique number, and two pressure sensors adjacent to each other along the pipeline correspond to the pipeline between them;

[0053] S5. Real-time leak detection and leak location calculation:

[0054] If a pipeline leaks, a pressure transient wave will be generated. This wave propagates to both ends of the pipeline at the speed of sound c. The location of the leak point can be calculated by recording the time difference Δt between the upstream and downstream pressure sensors detecting the pressure mutation:

[0055]

[0056] Where L represents the length of the pipeline between the two pressure sensors;

[0057] The time difference is calculated as:

[0058] Δt=t1-t2

[0059] The pressure signal is monitored in real time, and the pressure mutation moments t1 and t2 are identified through signal processing algorithms such as wavelet transform and Fourier transform. t1 is the time when the upstream pressure sensor senses the pressure transient wave, and t2 is the time when the downstream pressure sensor senses the pressure transient wave.

[0060] The pressure wave propagation velocity c in the pipeline is pre-calibrated by the pipeline material and fluid properties. Therefore, by substituting the above known parameters into the formula for calculating the leak point, the distance x from the leak point to the upstream sensor can be calculated.

[0061] S6. Estimation of leakage degree:

[0062] When a pipeline leak is detected, the overall pressure will drop due to the pipeline leak. Before the pressure reaches a new balance, the pressure decay rate per unit time is monitored. Combining the pipe volume and fluid compressibility, estimate the leakage:

[0063]

[0064] Where V is the volume of the fluid in the pipe, β is the bulk elastic modulus of the fluid, and g is the acceleration due to gravity.

[0065] Among them, the volume of the fluid in the pipeline can be directly calculated based on the pipeline inner diameter d and length L because the pipeline is a regular cylindrical tube. The specific formula is as follows:

[0066]

[0067] Since hydraulic oil is a common fluid, the bulk elastic modulus of the hydraulic oil can be directly obtained by looking up the table. The specific bulk elastic modulus of the hydraulic oil is (1.4-2.0)×10 9 Pa.

[0068] Example:

[0069] Windlass connection:

[0070] The oil inlet of the hydraulic pump station is connected through a pressure pipe (DN50, 20 meters long), a pipeline stop valve and the oil inlet of the anchor winch;

[0071] The oil return port of the hydraulic pump station is connected to the oil return port through the oil return pipe (DN65, 20 meters long), the oil return pipe check valve and the anchor windlass oil return port;

[0072] Cargo hatch cover connection (taking cargo hatch cover No. 1 as an example):

[0073] Pressure pipe branch: The end of the main pressure pipe away from the windlass is connected to the oil inlet of No. 1 cargo hatch cover through the pipeline stop valve, pressure pipe (DN40, 15 meters long);

[0074] Oil return pipe branch: The end of the main oil return pipe away from the windlass passes through the oil return pipe stop valve, the oil return pipe (DN50, 15 meters long) and the oil return port of the No. 1 cargo hatch cover;

[0075] Bypass connection: The pressure pipe and the oil return pipe are connected through a bypass high-pressure stop valve (for emergency unloading);

[0076] Sensor layout:

[0077] Layout principle: Pressure sensors are installed at the connection points of each pipe section. The numbering rules are as follows:

[0078] Anchor windlass pressure pipe: P1 (pump station end), P2 (anchor windlass end);

[0079] Anchor windlass oil return pipe: T1 (pump station end), T2 (anchor windlass end);

[0080] No. 1 cargo hatch cover pressure pipe: P3 (main pipe end), P4 (cargo hatch cover end);

[0081] No. 1 cargo hatch cover oil return pipe: T3 (main pipe end), T4 (cargo hatch cover end);

[0082] The numbers of other cargo hatch cover duct sensors are similar (P5-P16, T5-T16);

[0083] Scenario simulation of leak detection and location:

[0084] Pressure wave time difference positioning: simulate a leak in the pipeline between upstream sensor P3 and downstream sensor P4. The leak point is about 8 meters away from P3. The leak generates a pressure transient wave. The time when upstream sensor P3 detects the negative pressure wave is: t1 = 10:00:05.200s;

[0085] Downstream sensor P4 detects negative pressure wave time: t2 = 10:00:05.215s;

[0086] Time difference: Δt = |t1-t2| = 0.015s

[0087] Parameter calibration: pressure wave velocity c = 1200 m / s (pre-calculated by hydraulic oil density and pipeline elastic modulus);

[0088] Pipeline length: L = 15m;

[0089] Leak point location calculation:

[0090] Note: The calculated result is a negative value, indicating that the upstream sensor P3 is located downstream of the leak point. It is necessary to swap t1 and t2 and recalculate:

[0091] The result exceeds the length of the pipe, indicating that the direction is wrong;

[0092] Modify the formula and determine the propagation direction by the polarity of the pressure wave (the negative pressure wave reaches the upstream sensor first). The correct time difference should be: Δt = t2 - t1 = 0.015s. Recalculate:

[0093] This indicates that the leak is located upstream of P3, but there is a pump station upstream of P3, so the actual leak is located in the P3-P4 section.

[0094] Final positioning: Because the formula assumes that the leak point is between the two sensors, the actual solution with the smallest absolute value should be taken. Combined with the signal strength, it is determined that the leak point is about 8 meters away from P3;

[0095] Leakage estimation:

[0096] Stable pressure before leakage: P0=16MPa

[0097] Pressure decay curve within 10 seconds after leakage P(t)=16-0.5t(MPa)

[0098] Pressure decay rate:

[0099] Pipe inner diameter: d = 0.04m

[0100] Pipeline length: L = 15m, then

[0101] The bulk elastic modulus of hydraulic oil is: β = 1.8 × 10 9 Pa (obtained from table);

[0102] Leakage calculation: (A negative sign indicates a decrease in pressure);

[0103] Converted to volume flow |Q|≈1.73L / s

[0104] It was detected that the pressure difference between the P3 and P4 sections exceeded the threshold (1MPa). At the same time, the positioning algorithm output that the leakage point was 8 meters away from the P3 sensor and the leakage volume was about 1.73L / s.

[0105] Based on the above description, the present invention can control both the anchor windlass and the cargo hold cover by using the same hydraulic system equipped with corresponding pressure reducing accessories, thereby saving ship construction and operating costs, saving layout space, and reducing the need for corresponding fire protection and alarm systems in a machinery space. In addition, by using pressure sensors at both ends of each pipe section, pipeline leakage can be detected in real time, and the leakage location and leakage extent can be calculated at the first moment of pipeline leakage, so that timely response can be taken and staff can be notified to make advance repair preparations based on the leakage location and leakage extent.

[0106] In summary, when the combined hydraulic system of the windlass and cargo hatch cover is used, the hydraulic pump station is first started and the corresponding valve on the pressure pipe is opened and closed, so that the hydraulic oil enters the windlass or the corresponding cargo hatch cover along the pressure pipe, thereby opening the cargo hatch cover or starting the windlass. The corresponding valve on the return oil pipe is opened and closed, so that the hydraulic oil returns to the hydraulic pump station along the return oil pipe, thereby closing the corresponding windlass or cargo hatch cover.

[0107] If a pipeline leaks, a pressure transient wave will be generated. This wave propagates to both ends of the pipeline at the speed of sound c. The location of the leak point can be calculated by recording the time difference Δt between the upstream and downstream pressure sensors detecting the pressure mutation:

[0108]

[0109] When a pipeline leak is detected, the overall pressure will drop due to the pipeline leak. Before the pressure reaches a new balance, the pressure decay rate per unit time is monitored. Combining the pipe volume and fluid compressibility, estimate the leakage:

[0110]

[0111] Based on the calculated leak location, including the specific location of the pipeline and the leak point on the pipeline surface, as well as the calculated leakage volume parameters, the situation is promptly responded to and the staff is notified so that they can make preparations for pre-repair according to the leak location and leakage degree.

[0112] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A combined hydraulic system for an anchor winch and a cargo hatch cover, characterized by: The hydraulic system for combining an anchor winch and a cargo hatch cover comprises the following steps: S1. Pipeline layout between hydraulic pump station and anchor winch; S2. Pipeline layout between the hydraulic pump station and the cargo hatch cover; S3, hydraulic pump station operation; S4, pressure sensor layout; S5, real-time leak detection and leak location calculation; S6. Estimation of leakage extent.

2. The hydraulic combined system of an anchor winch and a cargo hatch cover according to claim 1, characterized in that: Step S1: Pipeline layout between the hydraulic pump station and the anchor winch: The oil inlet of the hydraulic pump station is connected to the oil inlet of the anchor windlass through a pressure pipe and a pipeline stop valve, while the oil return port of the hydraulic pump station is connected to the oil return port of the anchor windlass through a return oil pipe and a return oil pipe check valve.

3. The hydraulic combined system of an anchor winch and a cargo hatch cover according to claim 1, characterized in that: Step S2: Pipeline layout between the hydraulic pump station and the cargo hatch cover: The pressure pipe connected to the oil inlet of the hydraulic pump station is connected to the oil inlet of each cargo hatch cover through a pipeline stop valve on its branch away from the anchor windlass, and the oil return port of the hydraulic pump station is connected to the oil return port of each cargo hatch cover through a return pipe stop valve on its branch away from the anchor windlass; S3, Hydraulic pump station operation: By starting the hydraulic pump station and switching the corresponding valve on the pressure pipe, the hydraulic oil flows along the pressure pipe into the windlass or the corresponding cargo hatch cover, thereby opening the cargo hatch cover or starting the windlass. By switching the corresponding valve on the return oil pipe, the hydraulic oil returns to the hydraulic pump station along the return oil pipe, thereby closing the corresponding windlass or cargo hatch cover.

4. The hydraulic combined system of an anchor winch and cargo hatch cover according to claim 3, characterized in that: In step S2, the oil return pipe arranged between the oil return port of the hydraulic pump station and the oil return ports of each cargo hatch cover and the pressure pipe arranged between the oil inlet of the hydraulic pump station and the oil inlet of each cargo hatch cover are connected through a bypass high-pressure shut-off valve.

5. The hydraulic combined system of an anchor winch and a cargo hatch cover according to claim 1, characterized in that: Step S4: arranging pressure sensors: Pressure sensors are installed at both ends of each section of the pressure pipe and the oil return pipe, that is, at the connection between the pipes.

6. The hydraulic combined system of an anchor winch and a cargo hatch cover according to claim 5, characterized in that: In step S4, each pressure sensor has a unique number, and two pressure sensors adjacently distributed along the pipeline correspond to the pipeline therebetween.

7. The hydraulic combined system of an anchor winch and cargo hatch cover according to claim 1, characterized in that: Step S5, real-time leakage detection and leakage position calculation: If a pipeline leaks, a pressure transient wave will be generated. This wave propagates to both ends of the pipeline at the speed of sound c. The location of the leak point can be calculated by recording the time difference Δt between the upstream and downstream pressure sensors detecting the pressure mutation:

8. The hydraulic combined system of an anchor winch and a cargo hatch cover according to claim 7, characterized in that: In step S5, L represents the length of the pipeline between the two pressure sensors on the pipeline; The time difference is calculated as: Δt=t1-t2 The pressure signal is monitored in real time, and the pressure mutation moments t1 and t2 are identified through signal processing algorithms such as wavelet transform and Fourier transform. t1 is the time when the upstream pressure sensor senses the pressure transient wave, and t2 is the time when the downstream pressure sensor senses the pressure transient wave. The pressure wave propagation velocity c in the pipeline is pre-calibrated based on the pipeline material and fluid properties. Therefore, by substituting the above known parameters into the formula for calculating the leak point, the distance x from the leak point to the upstream sensor can be calculated.

9. The hydraulic combined system of an anchor winch and a cargo hatch cover according to claim 1, characterized in that: Step S6, leakage degree estimation: When a pipeline leak is detected, the overall pressure will drop due to the pipeline leak. Before the pressure reaches a new balance, the pressure decay rate per unit time is monitored. Combining the pipe volume and fluid compressibility, estimate the leakage: Where V is the volume of the fluid in the pipe, β is the bulk elastic modulus of the fluid, and g is the acceleration due to gravity.

10. The hydraulic combined system of an anchor winch and a cargo hatch cover according to claim 9, characterized in that: In step S6, the volume of the fluid in the pipeline can be directly calculated based on the pipeline inner diameter d and length L because the pipeline is a regular cylindrical tube. The specific formula is as follows: Since hydraulic oil is a common fluid, the bulk elastic modulus of the hydraulic oil can be directly obtained by looking up the table. The specific bulk elastic modulus of the hydraulic oil is (1.4-2.0)×10 9 Pa.

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