Mud door device, dredging ship and design method of mud door device

Abstract

The invention belongs to the technical field of ships, and discloses a mud door device, a dredging ship and a design method of the mud door device. Each mud door body comprises the first panel and the second panel, the reinforcing piece is arranged between the first panel and the second panel, bending deformation of the mud door bodies is reduced, and the sealing performance of the mud door bodies to the mud cabin is improved. According to the design method of the mud door device, abrasion parameters are introduced, a thickness calculation formula is provided, the thickness of the first panel and the thickness of the second panel are calculated, the stability of the mud door device is improved, abrasion factors are introduced, a new wall thickness calculation formula is provided, the wall thickness of the driving main rod is calculated, the stability of the driving device is improved, and the service life of the driving device is prolonged. Seawater dissolution parameters are introduced into a weld joint calculation formula, the weld joint calculation formula is proposed, the weld joint strength is checked, and the connection strength of the mud door device and the ship body is improved. The dredge ship adopts the mud door device designed by the design method of the mud door device, so that the connection stability is improved, and the dredging efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a mud gate device, a dredging ship and a design method of the mud gate device. Background Art

[0002] With the rapid development of global ocean development and port and waterway construction, the requirements for dredging efficiency and quality are becoming increasingly stringent. Dredging vessels, as the core equipment for dredging operations, must improve their performance to complete large-scale dredging tasks. Mud gates are used to control the critical functions of mud intake, storage, and discharge.

[0003] In the existing technology, the welds at the contact position between the mud gate device and the dredging vessel are in a seawater environment for a long time. The traditional weld strength verification formula is difficult to accurately verify the strength of the welds in seawater, resulting in weld failure during dredging operations. The mud gate device and the dredging vessel fall off, and the dredging work needs to be stopped and the mud gate device needs to be reinstalled, which reduces the dredging efficiency; due to the increase in the amount of mud stored in the mud tank, the mud gate formed by the original design method is difficult to meet the strength requirements, and the edges and corners of the mud gate are prone to bending and deformation, which reduces the sealing effect of the mud tank. The mud gate panel in contact with the mud will be washed by the mud, reducing the thickness, and there is a risk of damage to the mud gate panel due to insufficient strength. Summary of the Invention

[0004] The purpose of the present invention is to provide a mud gate device, a dredging vessel and a design method for the mud gate device, thereby increasing the service life of the mud gate device and thereby improving the operating efficiency of the dredging project.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A mud door device, comprising:

[0007] Two oppositely disposed mud door bodies, each of which includes a first panel, a second panel, and a reinforcement member, the reinforcement member being disposed around the top surface of the second panel, the first panel being fixedly connected to a side of the reinforcement member away from the second panel, and the thickness of the first panel being greater than that of the second panel;

[0008] The driving assembly includes a driving main rod, a driving slave rod and a driving member. The top end of the driving main rod is transmission-connected to the driving member, the bottom end of the driving main rod is rotationally connected to the two driving slave rods, and the other ends of the two driving slave rods are rotationally connected to the two mud door bodies respectively. The driving member can drive the driving main rod to descend and drive the two driving slave rods to move, so that the two mud door bodies rotate away from each other; or, the driving member can drive the driving main rod to ascend and drive the two driving slave rods to move, so that the two mud door bodies rotate toward each other.

[0009] A limit pin can be inserted into the driving main rod to limit the lifting movement of the driving main rod, and the limit pin is provided with a weight-reducing notch.

[0010] In the above-mentioned mud door device, the weight-reducing notch is opened at the bottom end of the limiting latch, and the weight-reducing notch is an arched notch.

[0011] In the above-mentioned mud door device, elastic sealing strips are provided on the sides of the two first panels that are close to each other.

[0012] A dredging vessel comprises the above-mentioned mud gate device, wherein the dredging vessel comprises a mud chamber, a hull bottom plate and a hull ear plate, the hull bottom plate is provided with a mud inlet and outlet, the hull ear plate is welded and fixed to the hull bottom plate, the mud chamber is communicated with the mud inlet and outlet, the mud gate body is rotatably connected to the hull ear plate, and two mud gate bodies are rotated in opposite directions to open the mud inlet and outlet, allowing the mud to enter or be discharged from the mud chamber, and the two mud gate bodies are rotated in opposite directions to close the mud inlet and outlet, allowing the mud chamber to store mud.

[0013] In the above-mentioned dredging vessel, the mud door device further includes a limiting sleeve, which is fixedly connected to the top of the mud compartment and wraps at least a portion of the driving main rod. The driving main rod can slide in the limiting sleeve.

[0014] The above-mentioned dredging vessel, wherein the limiting sleeve is provided with a first limiting hole, the first limiting hole extends along the radial direction of the limiting sleeve, the driving main rod is provided with a second limiting hole, the second limiting hole extends along the radial direction of the driving main rod, and the limiting pin can be inserted into the first limiting hole and the second limiting hole to limit the movement of the driving main rod.

[0015] A design method for a mud door device is used to design the above-mentioned mud door device, which includes:

[0016] Optimizing the calculation formula for the thickness of the mud door panel, designing a calculation formula for the thickness of the mud door panel that includes wear parameters, and calculating the thickness of the first panel and the second panel according to the optimized calculation formula for the thickness of the mud door panel;

[0017] Optimize the wall thickness calculation formula of the pipe fitting, design the wall thickness calculation formula of the pipe fitting including the wear factor, and calculate the wall thickness of the driving main rod based on the optimized wall thickness calculation formula of the pipe fitting;

[0018] Optimize the weld strength calculation formula, design a weld strength calculation formula that includes the seawater corrosion coefficient, and calibrate the strength of the weld between the hull bottom plate and the hull ear plate based on the optimized weld strength calculation formula.

[0019] In the design method of the above-mentioned mud door device, the optimized calculation formula for the thickness of the mud door panel is as follows:

[0020]

[0021] In the above formula,

[0022] d1 is the thickness of the first panel;

[0023] d2 is the thickness of the second panel;

[0024] [τ] is the allowable stress of the materials selected for the first panel and the second panel;

[0025] C1 is the rectangular plate coefficient of the first panel;

[0026] C2 is the rectangular plate coefficient of the second panel;

[0027] q1 is the external uniformly distributed load borne by the first panel;

[0028] q2 is the external uniformly distributed load borne by the second panel;

[0029] a is the length of the hull bottom plate opening;

[0030] b is the width of the hull bottom plate opening, where b is greater than or equal to 0.5a;

[0031] r is the wear rate of the first panel;

[0032] T is the design life of the mud door body;

[0033] C is the seawater corrosion allowance.

[0034] In the design method of the above-mentioned mud gate device, the wall thickness calculation formula of the optimized pipe fitting is as follows:

[0035]

[0036] In the above formula,

[0037] d is the wall thickness of the pipe to be calculated;

[0038] λ is the wear factor. Based on the actual ship test results, the recommended value is 0.15-0.25;

[0039] ρ1 is the specific gravity of the mud;

[0040] ρ2 is the specific gravity of seawater;

[0041] g is the acceleration due to gravity;

[0042] h1 is the height of the highest liquid level in the mud tank;

[0043] h2 is the draft of the dredging vessel;

[0044] b is the width of the hull bottom plate opening;

[0045] a1 is the transverse clearance between the mud gate body and the dredging vessel;

[0046] a2 is the longitudinal gap between the mud gate body and the dredging vessel;

[0047] a3 is the gap between the two mud door bodies;

[0048] d2 is the inner diameter of the pipe to be calculated;

[0049] [τ] is the allowable stress of the material used for the pipe fitting to be calculated;

[0050] ψ is the reduction coefficient of the pipe to be calculated, which is determined by the flexibility of the pipe to be calculated. In the design method of the above mud gate device, the optimized weld strength calculation formula is as follows:

[0051]

[0052] In the above formula,

[0053] M is the bending moment at the centroid of the hull lug;

[0054] q1 is the external uniformly distributed load borne by the first panel;

[0055] q2 is the external uniformly distributed load borne by the second panel;

[0056] A f is the effective area of ​​the weld;

[0057] x1 is the effective width of the weld in the horizontal direction;

[0058] y1 is the effective width of the weld in the vertical direction;

[0059] I f is the moment of inertia at the centroid of the hull lug;

[0060] x2 is the vertical distance between the centroid of the hull lug and the weld;

[0061] y2 is the normal distance between the centroid of the hull ear plate and the weld;

[0062] δ is the seawater corrosion coefficient. According to actual ship test data, the seawater corrosion coefficient is 1≤δ≤2;

[0063] [τ] is the allowable stress of the material used for the hull lug.

[0064] Beneficial effects of the present invention:

[0065] The mud door device provided by the present invention includes a mud door body and a drive assembly. The mud door body includes a first panel and a second panel. The reinforcement is connected between the first panel and the second panel to support the first panel and the second panel, thereby avoiding bending and deformation of the first panel and the second panel, and improving the sealing of the mud door device. The thickness of the first panel is greater than the thickness of the second panel, which can ensure that the first panel still has sufficient strength after being washed by mud, thereby avoiding damage to the first panel and improving stability.

[0066] The design method of the mud gate device provided by the present invention introduces parameters such as seawater salinity, seawater temperature parameters, dissolved oxygen content in seawater and seawater pH value into the weld calculation formula, which can more accurately simulate the environment of the weld in seawater, improve the accuracy of weld strength verification, reduce the possibility of weld failure, and improve the stability of the connection between the mud gate body and the hull. There is no need to stop the ship to inspect whether the weld has failed, or to stop the ship to reinstall the mud gate device due to weld failure, thereby improving dredging efficiency; at the same time, a wear parameter is introduced into the calculation formula of the original mud gate body thickness, thereby improving the accuracy of thickness calculation, reducing the thickness of the mud gate body while meeting the requirements of use strength, and saving costs.

[0067] The dredging vessel provided by the present invention is equipped with a mud gate device designed according to the mud gate device design method. During the design stage, the scouring of the first panel by mud is taken into consideration, and the thickness of the first panel is increased to ensure that the first panel meets the strength requirements. The influence of seawater on the weld is taken into consideration to ensure that the weld will not fail in the seawater environment, thereby improving the connection stability between the mud gate device and the dredging vessel and thereby improving the dredging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 Schematic diagram of the structure of the mud door device provided by an embodiment of the present invention;

[0069] Figure 2 yes Figure 1 Schematic diagram of the method at A in the middle;

[0070] Figure 3 is a cross-sectional schematic diagram of a mud door device provided by an embodiment of the present invention;

[0071] Figure 4 yes Figure 3 Schematic diagram of the method at B;

[0072] Figure 5 Schematic diagram of the cooperation between the mud gate body and the hull ear plate provided by an embodiment of the present invention;

[0073] Figure 6 is a schematic structural diagram of a drive rod assembly provided by an embodiment of the present invention;

[0074] Figure 7 yes Figure 6Schematic diagram of the method at C in the middle;

[0075] Figure 8 1 is a schematic structural diagram of a limit latch provided by an embodiment of the present invention;

[0076] Figure 9 It is a schematic diagram of the host computer interface of the mud door device design provided by an embodiment of the present invention.

[0077] In the picture:

[0078] 10. Mud door body; 101. First panel; 1011. Connecting ear plate; 102. Second panel; 103. Reinforcement member;

[0079] 20. Driving assembly; 201. Driving main rod; 202. Driving slave rod; 30. Limiting pin; 301. Weight reduction notch;

[0080] 40. Limit sleeve;

[0081] 50. Connect the hinge seat;

[0082] 60. Protective sleeve;

[0083] 70. Placement seat;

[0084] 100. Hull lugs. DETAILED DESCRIPTION

[0085] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0086] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0087] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0088] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0089] The mud gate device, dredging vessel and mud gate device design method provided by the present invention can increase the service life of the mud gate device and thus improve the operating efficiency of the dredging project

[0090] like Figures 1-9 As shown, the mud door device includes two relatively arranged mud door bodies 10 and a driving assembly 20, each mud door body 10 includes a first panel 101, a second panel 102 and a reinforcement 103, the reinforcement 103 is arranged around the top surface of the second panel 102, the first panel 101 is fixedly connected to the side of the reinforcement 103 away from the second panel 102, and the thickness of the first panel 101 is greater than the thickness of the second panel 102; the driving assembly 20 includes a driving main rod 201, a driving slave rod 202 and a driving member, the top end of the driving main rod 201 is transmission-connected to the driving member, and the driving main rod 201 is fixedly connected to the side of the reinforcement 103 away from the second panel 102. The bottom end is rotatably connected to the two driving slave rods 202, and the other ends of the two driving slave rods 202 are rotatably connected to the two mud door bodies 10 respectively. The driving member can drive the driving main rod 201 to descend and drive the two driving slave rods 202 to move, so that the two mud door bodies 10 rotate away from each other; or, the driving member can drive the driving main rod 201 to rise and drive the two driving slave rods 202 to move, so that the two mud door bodies 10 rotate toward each other. The limit pin 30 can be inserted into the driving main rod 201 to limit the lifting and lowering movement of the driving main rod 201, and the limit pin 30 is provided with a weight-reducing notch 301.

[0091] The mud door device provided by the present invention includes a mud door body 10 and a drive assembly 20. The mud door body 10 includes a first panel 101 and a second panel 102. The reinforcement 103 is connected between the first panel 101 and the second panel 102 to support the first panel 101 and the second panel 102, thereby preventing the first panel 101 and the second panel 102 from bending and deforming, thereby improving the sealing of the mud door device. The thickness of the first panel 101 is greater than the thickness of the second panel 102, thereby ensuring that the first panel 101 still has sufficient strength after being washed by mud, thereby avoiding damage to the first panel 101 and improving stability.

[0092] In this embodiment, the thickness of the first panel 101 is greater than the thickness of the second panel 102. During dredging operations by a dredging vessel, the first panel 101 is close to the mud tank. As the dredging vessel moves, the mud in the mud tank sloshes and washes the surface of the first panel 101. During the mud discharge process, the mud also washes the surface of the first panel 101, causing the thickness of the first panel 101 to decrease, reducing its strength and service life. Therefore, the thickness of the first panel 101 is greater than that of the second panel 102. This not only meets the strength requirements and increases the service life of the mud door device, but also eliminates the need to increase the thickness of the second panel 102, thus reducing costs.

[0093] Specifically, the surface of the first panel 101 that is subjected to erosion is strengthened by surfacing a wear-resistant alloy on the surface of the first panel 101 to improve wear resistance and thereby increase service life. The wear-resistant alloy may be a high chromium alloy.

[0094] The reinforcement 103 is used to support the first panel 101 and the second panel 102 to prevent the first panel 101 and / or the second panel 102 from bending and deforming due to stress, thereby affecting the sealing performance of the mud door device. Figure 1 、 Figure 2 and Figure 5 The reinforcement 103 is a frame structure, surrounding the first panel 101 and not located on the side where the two first panels 101 are close to each other. The first panel 101 and / or the second panel 102 are pressed against the reinforcement 103, which bears the load, preventing deformation of the first panel 101 and / or the second panel 102 and improving the sealing performance of the mud door device.

[0095] The reinforcement 103 is arranged between the first panel 101 and the second panel 102, which enhances the structural stability and overall bearing capacity of the mud door body 10, avoids the occurrence of the mud door body 10 rising in the middle and concave at both ends during long-term use, ensures the sealing of the mud door device, and further ensures that the mud in the mud tank will not leak, thereby improving the dredging efficiency of the dredging vessel.

[0096] The present invention also provides a dredging vessel, comprising the above-mentioned mud gate device, the dredging vessel comprising a mud chamber, a hull bottom plate and a hull ear plate 100, the hull bottom plate is provided with a mud inlet and outlet, the hull ear plate 100 is welded and fixed to the hull bottom plate, the mud chamber is connected to the mud inlet and outlet, the mud gate body 10 is rotatably connected to the hull ear plate 100, the two mud gate bodies 10 are rotated in opposite directions to open the mud inlet and outlet, allowing mud to enter or discharge the mud chamber, and the two mud gate bodies 10 are rotated in opposite directions to close the mud inlet and outlet, allowing the mud chamber to store mud.

[0097] The dredging vessel provided by the present invention is equipped with a mud gate device designed according to the mud gate device design method. During the design stage, the scouring of the first panel 101 by mud is taken into consideration, and the thickness of the first panel 101 is increased to ensure that the first panel 101 meets the strength requirements. The influence of seawater on the weld is taken into consideration to ensure that the weld will not fail in the seawater environment, thereby improving the connection stability between the mud gate device and the dredging vessel and thereby improving the dredging efficiency.

[0098] The mud gate device is rotatably connected to the hull of the dredging vessel. In the embodiment, see Figure 1 、 Figure 2 and Figure 5 The reinforcements 103 on the side away from each other of the two first panels 101 are both provided with a connecting hinge 50, which can be rotatably connected to the hull ear plate 100, making the connection convenient, and the hinged connection method makes the mud door body 10 rotate smoother relative to the hull.

[0099] Further, see Figure 2 and Figure 5 Each reinforcement member 103 is provided with two connecting hinges 50, and the two connecting hinges 50 are spaced apart along the first direction. Figure 1 As shown in the X-axis, a protective sleeve 60 is disposed between the two connecting hinges 50. The protective sleeve 60 extends in a first direction and is fixedly connected to the reinforcement 103. During connection, the two connecting hinges 50 are connected to the hull lugs 100 on the hull. A rotating shaft is inserted through the connecting hinges 50, the hull lugs 100, and the protective sleeve 60, allowing the mud gate assembly to rotate about the rotating shaft. The two connecting hinges 50 evenly distribute the weight of the mud gate body 10, improving support stability. The protective sleeve 60 wraps around the rotating shaft, reducing the impact of debris in the seawater on the rotating shaft and increasing its service life.

[0100] Specifically, limit members are provided at both ends of the rotating shaft to prevent the rotating shaft from sliding off the hull ear plate 100 and / or the connecting hinge seat 50, thereby improving the connection stability.

[0101] The hull ear plate 100 is fixed to the hull of the dredging vessel by welding, and the welding connection is convenient and has high connection strength.

[0102] The driving assembly 20 is used to drive the mud door body 10 to rotate. In this embodiment, see Figure 1 and Figure 2 A connecting lug 1011 is fixedly connected to the first panel 101, and the driving assembly 20 is rotatably connected to the connecting lug 1011. The rotating connection can avoid interference with the driving rod 202 when the two mud door bodies 10 move away from each other or towards each other, thereby improving the smoothness of the movement.

[0103] The driving member can be a hydraulic cylinder. The driving force of the hydraulic cylinder is large and can drive the driving main rod 201 to move so as to drive the two mud gate bodies 10 to rotate away from each other or towards each other. When in use, the hydraulic rod of the hydraulic cylinder extends to drive the driving main rod 201 to move downward. The driving main rod 201 drives the two driving slave rods 202 to move downward to push the two mud gate bodies 10. The two mud gate bodies 10 rotate away from each other, which will open the mud inlet and outlet, discharge the mud in the mud tank, or perform mud loading operations. Since the mud gate body 10 and the driving slave rod 202 are rotationally connected, the rotation of the two mud gate bodies 10 away from each other will cause the two driving slave rods 202 to rotate around the driving main rod 201 to ensure that the driving slave rods 202 are connected to the mud gate body 10.

[0104] Specifically, the mud door device also includes a limiting sleeve 40, which is fixedly connected to the top of the mud chamber and surrounds at least a portion of the driving main rod 201. The driving main rod 201 can slide within the limiting sleeve 40. The driving main rod 201 slides within the limiting sleeve 40 without contacting the mud, thereby reducing mud erosion on the driving main rod 201 and increasing the service life of the driving main rod 201.

[0105] Furthermore, the limiting sleeve 40 wraps the top portion of the driving main rod 201, reducing the length of the limiting sleeve 40, saving materials and reducing costs.

[0106] In order to improve the sealing performance of the mud door body 10 in sealing the mud inlet and outlet, in this embodiment, the limiting sleeve 40 is provided with a first limiting hole, which extends in the radial direction of the limiting sleeve 40, and the driving main rod 201 is provided with a second limiting hole, which extends in the radial direction of the driving main rod 201. The limiting pin 30 can be inserted into the first limiting hole and the second limiting hole to limit the movement of the driving main rod 201. The hole-shaft fit makes the connection convenient and stable, making it easy for workers to insert and remove the limiting pin 30.

[0107] Specifically, see Figure 8The weight-reducing notch 301 is provided at the bottom end of the limit pin 30. The weight-reducing notch 301 is an arched notch. Due to the action of gravity, the two mud gate bodies 10 rotate downward, driving the driving slave rod 202 and the driving main rod 201 to move downward. After the limit pin 30 is inserted into the first limit hole and the second limit hole, the top thereof will be subjected to the shear force of the driving main rod 201. Therefore, the weight-reducing notch 301 is provided at the bottom end of the limit pin 30 to ensure that the strength of the limit pin 30 meets the requirements and can withstand the shear force applied to the limit pin 30 by the driving main rod 201, thereby ensuring that the mud gate body 10 will not rotate downward, well sealing the mud inlet and outlet, and improving the efficiency of dredging ships in transporting mud.

[0108] At the same time, through finite element modeling analysis, the weight of the limit pin 30 is reduced by about 20% while ensuring that the limit pin 30 has sufficient bearing capacity, which makes it easier for workers to plug and unplug and reduces their workload.

[0109] Specifically, the material of the limiting latch 30 is Q460, which improves the strength of the limiting latch 30 .

[0110] In other examples, the weight-reducing notch 301 may also be a circular notch, an elliptical notch, or a rectangular notch.

[0111] In order to further reduce the workload of the staff in carrying the limit latch 30, see Figure 2 and Figure 4 In this embodiment, the limiting sleeve 40 is also fixedly connected to a placement seat 70, which is used to place the limiting latch 30, thereby reducing the transportation of the limiting latch 30, alleviating the labor burden of the staff, and improving work efficiency.

[0112] Furthermore, elastic sealing strips are provided on the sides of the two first panels 101 that are close to each other, which can further improve the sealing effect of the two mud door bodies 10 on the mud tank. Specifically, the elastic sealing strips can be made of fluororubber, which has strong corrosion resistance and excellent tolerance to seawater, salt spray, and acidic and alkaline substances, thereby preventing seawater erosion and extending the service life.

[0113] The present invention also provides a design method for a mud door device, which is used to design the above-mentioned mud door device. The design method for the mud door device includes optimizing a calculation formula for the thickness of the mud door panel, designing a calculation formula for the thickness of the mud door panel that includes wear parameters, and calculating the thickness of the first panel 101 and the second panel 102 according to the optimized calculation formula for the thickness of the mud door panel;

[0114] Optimizing the wall thickness calculation formula of the pipe fitting, designing the wall thickness calculation formula of the pipe fitting including the wear factor, and calculating the wall thickness of the driving main rod 201 based on the optimized wall thickness calculation formula of the pipe fitting;

[0115] The weld strength calculation formula is optimized, a weld strength calculation formula including the seawater corrosion coefficient is designed, and the strength of the weld between the hull bottom plate and the hull ear plate 100 is calibrated according to the optimized weld strength calculation formula.

[0116] The design method of the mud gate device provided by the present invention introduces parameters such as seawater salinity, seawater temperature parameters, dissolved oxygen content in seawater and seawater pH value into the weld calculation formula, which can more accurately simulate the environment of the weld in seawater, improve the accuracy of weld strength verification, reduce the possibility of weld failure, and improve the stability of the connection between the mud gate device and the hull. There is no need to stop the ship to inspect whether the weld has failed, or to stop the ship to reinstall the mud gate device due to weld failure, thereby improving dredging efficiency; at the same time, a wear parameter is introduced into the calculation formula for the thickness of the mud gate panel, thereby improving the accuracy of the thickness calculation, reducing the thickness of the mud gate panel while meeting the requirements of the use strength, and saving costs.

[0117] Specifically, the optimized calculation formula for the thickness of the mud door panel is as follows:

[0118]

[0119] In the above formula, d1 is the thickness of the first panel 101, d2 is the thickness of the second panel 102, [τ] is the allowable stress of the material selected for the first panel 101 and the second panel 102, C1 is the rectangular flat plate coefficient of the first panel 101, C2 is the rectangular flat plate coefficient of the second panel 102, q1 is the external uniformly distributed load borne by the first panel 101, q2 is the external uniformly distributed load borne by the second panel 102, a is the length dimension of the hull bottom plate opening, b is the width dimension of the hull bottom plate opening, where b is greater than or equal to 0.5a, r is the wear rate of the first panel 101, T is the design life of the mud door body 10, and C is the seawater corrosion allowance.

[0120] It should be noted that when calculating the thickness of the first panel 101 and the second panel 102, d1 and d2 are both taken as the maximum value of the calculation results in the optimized mud gate panel thickness calculation formula to ensure that the strength of the first panel 101 and / or the second panel 102 meets the use requirements, avoids damage, and improves dredging efficiency.

[0121] It should be noted that the first panel 101 is located above the second panel 102. When the two mud door bodies 10 close the mud inlet and outlet, the mud in the mud chamber washes the surface of the first panel 101, causing the thickness of the first panel 101 to decrease. To avoid the first panel 101 from being damaged due to insufficient strength, the wear parameter r is introduced when calculating the thickness of the first panel 101 to ensure that the first panel 101 still has sufficient strength after being washed and worn by the mud, thereby improving the stability of the mud door device. The second panel 102 is basically not washed by the mud. Therefore, when calculating the thickness of the second panel 102, wear can be ignored. On the premise of meeting the strength requirement, the thickness of the second panel 102 can be reduced to save costs.

[0122] The calculation formulas for q1 and q2 in the optimized mud door panel thickness calculation formula are as follows:

[0123]

[0124] In the above formula, ρ1 is the specific gravity of mud, ρ2 is the specific gravity of seawater, g is the acceleration of gravity, h1 is the height of the highest liquid level in the mud tank, h2 is the draft of the dredging vessel, a1 is the transverse gap between the mud gate body 10 and the hull of the dredging vessel, a2 is the longitudinal gap between the mud gate body 10 and the hull of the dredging vessel, and a3 is the gap between the two mud gate bodies 10.

[0125] Specifically, the wall thickness calculation formula of the optimized pipe fitting is as follows:

[0126]

[0127] In the above formula, d is the wall thickness of the pipe to be calculated, λ is the wear factor of the drive assembly 20. According to the test results of dredging operations of dredging vessels, the recommended wear factor λ is 0.15-0.25, ρ1 is the specific gravity of mud, ρ2 is the specific gravity of seawater, g is the acceleration of gravity, h1 is the height of the highest liquid level in the mud tank, h2 is the draft of the dredging vessel, b is the width of the hull bottom plate opening, a1 is the transverse gap between the mud gate body 10 and the hull of the dredging vessel, a2 is the longitudinal gap between the mud gate body 10 and the hull of the dredging vessel, a3 is the gap between the two mud gate bodies 10, d2 is the inner diameter of the pipe to be calculated, [τ] is the allowable stress of the material used for the pipe to be calculated, and ψ is the reduction coefficient of the pipe to be calculated, which is determined by the flexibility of the pipe to be calculated.

[0128] The limiting sleeve 40 is fixedly connected to the top of the mud tank and remains in the tank for a long time. During the loading and unloading process, mud will wash away the drive assembly 20 that is not covered by the limiting sleeve 40, causing mud wear on the drive assembly 20 and reducing its service life. Therefore, the optimized pipe wall thickness calculation formula incorporates a wear factor λ to ensure that the service life of the drive assembly 20 meets actual usage requirements. The optimized pipe wall thickness calculation formula can also be used to calculate the wall thickness of the limiting sleeve 40. Because the upper part of the mud tank is mostly clear water, the limiting sleeve 40 is largely unaffected by mud, and wear can be ignored in the calculation.

[0129] Specifically, the optimized weld strength calculation formula is as follows:

[0130]

[0131] In the above formula, M is the bending moment at the centroid of the hull ear plate 100, q1 is the external uniform load borne by the first panel 101, q2 is the external uniform load borne by the second panel 102, and A f is the effective area of ​​the weld, x1 is the effective width of the weld in the horizontal direction, y1 is the effective width of the weld in the vertical direction, I f is the moment of inertia at the centroid of the hull ear plate 100, x2 is the vertical distance between the centroid of the hull ear plate 100 and the weld, y2 is the normal distance between the centroid of the hull ear plate 100 and the weld, δ is the seawater corrosion coefficient. According to the actual ship test data, the seawater corrosion coefficient is 1≤δ≤2, and [τ] is the allowable stress of the material used for the hull ear plate 100.

[0132] The optimized weld strength calculation formula fully considers the influence of seawater erosion on the weld, and incorporates factors such as salinity, temperature, dissolved oxygen content, and pH value into the influencing factors. The calculation result is more accurate and can reflect the strength of the weld in seawater, avoiding weld failure that causes separation of the hull ear plate 100 and the dredging vessel, enhancing the connection stability between the hull ear plate 100 and the hull, ensuring the stability of the mud gate device, and improving dredging efficiency.

[0133] It should be noted that in order to ensure a stable connection between the hull ear plate 100 and the hull, the three formulas in the optimized weld strength calculation formula need to be satisfied simultaneously.

[0134] The present invention also provides mud door modeling software, see Figure 9 By inputting the length and width of the hull bottom plate opening, the height of the highest liquid level in the mud tank, the draft of the dredging vessel, the specific gravity of the mud, the specific gravity of the seawater, the transverse gap between the mud gate body 10 and the hull of the dredging vessel, the longitudinal gap between the mud gate body 10 and the hull of the dredging vessel, and the wear factor or wear amount of the drive component 20 into the upper computer interface, a design scheme for the mud gate device can be quickly generated to improve design efficiency.

[0135] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A mud door device, characterized in that: include: Two mud door bodies (10) are arranged opposite to each other, each of the mud door bodies (10) comprises a first panel (101), a second panel (102) and a reinforcement (103), the reinforcement (103) is arranged around the top surface of the second panel (102), the first panel (101) is fixedly connected to a side of the reinforcement (103) away from the second panel (102), and the thickness of the first panel (101) is greater than the thickness of the second panel (102); The driving assembly (20) comprises a driving main rod (201), a driving slave rod (202) and a driving member, wherein the top end of the driving main rod (201) is connected to the driving member in a transmission manner, the bottom end of the driving main rod (201) is connected in rotation to the two driving slave rods (202), and the other ends of the two driving slave rods (202) are respectively connected in rotation to the two mud door bodies (10), and the driving member can drive the driving main rod (201) to descend and drive the two driving slave rods (202) to move, so that the two mud door bodies (10) rotate in opposite directions; or the driving member can drive the driving main rod (201) to ascend and drive the two driving slave rods (202) to move, so that the two mud door bodies (10) rotate in opposite directions. A limit pin (30) is capable of being inserted into the driving main rod (201) to limit the lifting movement of the driving main rod (201), and the limit pin (30) is provided with a weight-reducing notch (301).

2. The mud door device according to claim 1, characterized in that: The weight-reducing notch (301) is provided at the bottom end of the limiting latch (30), and the weight-reducing notch (301) is an arched notch.

3. The mud door device according to claim 1, characterized in that: An elastic sealing strip is provided on each side of the two first panels (101) that are close to each other.

4. A dredging vessel comprising the mud gate device according to any one of claims 1 to 3, characterized in that: The dredging vessel comprises a mud chamber, a hull bottom plate and a hull ear plate (100); the hull bottom plate is provided with a mud inlet and outlet; the hull ear plate (100) is welded and fixed to the hull bottom plate; the mud chamber is communicated with the mud inlet and outlet; the mud gate body (10) is rotatably connected to the hull ear plate (100); two mud gate bodies (10) are rotated in opposite directions to open the mud inlet and outlet, so that the mud enters or is discharged from the mud chamber; and two mud gate bodies (10) are rotated in opposite directions to close the mud inlet and outlet, so that the mud chamber stores mud.

5. The dredging vessel according to claim 4, characterized in that: The mud door device further comprises a limiting sleeve (40), the limiting sleeve (40) being fixedly connected to the top end of the mud compartment, and the limiting sleeve (40) wraps at least a portion of the driving main rod (201), and the driving main rod (201) is capable of sliding in the limiting sleeve (40).

6. The dredging vessel according to claim 5, characterized in that: The limiting sleeve (40) is provided with a first limiting hole, which extends in the radial direction of the limiting sleeve (40); the driving main rod (201) is provided with a second limiting hole, which extends in the radial direction of the driving main rod (201); the limiting pin (30) can be inserted into the first limiting hole and the second limiting hole to limit the movement of the driving main rod (201).

7. A method for designing a mud door device, used for designing the mud door device according to any one of claims 1 to 3, characterized in that: include: Optimizing a calculation formula for the thickness of a mud door panel, designing a calculation formula for the thickness of a mud door panel including wear parameters, and calculating the thickness of the first panel (101) and the second panel (102) according to the optimized calculation formula for the thickness of the mud door panel; Optimizing the wall thickness calculation formula of the pipe fitting, designing the wall thickness calculation formula of the pipe fitting including the wear factor, and calculating the wall thickness of the driving main rod (201) according to the optimized wall thickness calculation formula of the pipe fitting; The weld strength calculation formula is optimized, a weld strength calculation formula including a seawater corrosion coefficient is designed, and the strength of the weld between the hull bottom plate and the hull ear plate (100) is calibrated according to the optimized weld strength calculation formula.

8. The design method of the mud door device according to claim 7, characterized in that: The optimized calculation formula for the thickness of the mud door panel is as follows: In the above formula, d1 is the thickness of the first panel (101); d2 is the thickness of the second panel (102); [τ] is the allowable stress of the material selected for the first panel (101) and the second panel (102); C1 is the rectangular plate coefficient of the first panel (101); C2 is the rectangular plate coefficient of the second panel (102); q1 is the external uniformly distributed load borne by the first panel (101); q2 is the external uniformly distributed load borne by the second panel (102); a is the length of the hull bottom plate opening; b is the width of the hull bottom plate opening, where b is greater than or equal to 0.5a; r is the wear rate of the first panel (101); T is the design life of the mud door body (10); C is the seawater corrosion allowance.

9. The design method of a mud door device according to claim 7, characterized in that: The wall thickness calculation formula of the optimized pipe fitting is as follows: In the above formula, d is the wall thickness of the pipe to be calculated; λ is the wear factor. Based on the actual ship test results, the recommended value is 0.15-0.25; ρ1 is the specific gravity of the mud; ρ2 is the specific gravity of seawater; g is the acceleration due to gravity; h1 is the height of the highest liquid level in the mud tank; h2 is the draft of the dredging vessel; b is the width of the hull bottom plate opening; a1 is the transverse gap between the mud gate body (10) and the dredging vessel; a2 is the longitudinal gap between the mud gate body (10) and the dredging vessel; a3 is the gap between the two mud door bodies (10); d2 is the inner diameter of the pipe to be calculated; [τ] is the allowable stress of the material used for the pipe fitting to be calculated; ψ is the reduction coefficient of the pipe to be calculated, which is determined by the flexibility of the pipe to be calculated.

10. The design method of a mud door device according to claim 7, characterized in that: The optimized weld strength calculation formula is as follows: In the above formula, M is the bending moment at the centroid of the hull lug (100); q1 is the external uniformly distributed load borne by the first panel (101); q2 is the external uniformly distributed load borne by the second panel (102); A f is the effective area of ​​the weld; x1 is the effective width of the weld in the horizontal direction; y1 is the effective width of the weld in the vertical direction; I f is the moment of inertia at the centroid of the hull lug (100); x2 is the vertical distance between the centroid of the hull ear plate (100) and the weld; y2 is the normal distance between the centroid of the hull ear plate (100) and the weld; δ is the seawater corrosion coefficient. According to actual ship test data, the seawater corrosion coefficient is 1≤δ≤2; [τ] is the allowable stress of the material used for the hull lug (100).

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