A mud door device, dredging vessel and design method of a mud door device

Abstract

The present application belongs to the technical field of ship, disclose a kind of mud door device, dredging ship and the design method of mud door device.Each mud door body includes first panel and second panel, first panel and second panel are provided with reinforcing member between, reduce the bending deformation of mud door body, improve the sealing of mud door body to mud cabin.The design method of mud door device, introduces wear parameter, proposes thickness calculation formula and calculates the thickness of first panel and second panel, improves the stability of mud door device, introduces wear factor, proposes new wall thickness calculation formula and calculates the wall thickness of driving main rod, improves the stability and service life of driving device, in weld calculation formula introduces seawater dissolution parameter, proposes weld calculation formula and checks weld strength, improves the connection strength of mud door device and ship.Using the design method of mud door device of dredging ship, the connection stability of mud door device designed by the design method is improved, and the dredging efficiency is further improved.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a mudgate device, a dredging vessel, and a design method for the mudgate device. Background Technology

[0002] With the rapid development of global marine development and port and waterway construction, the requirements for the efficiency and quality of dredging operations are becoming increasingly stringent. As the core equipment for dredging operations, the performance improvement of dredging vessels is crucial for completing large-scale dredging tasks. Mud gate devices are used to control the intake, storage, and discharge of mud.

[0003] In existing technologies, the welds at the contact points between the mud gate device and the dredging vessel are constantly exposed to seawater. Traditional weld strength verification formulas are insufficient to accurately verify the weld strength in seawater, leading to weld failure during dredging operations. This causes the mud gate device to detach from the dredging vessel, requiring the dredging work to be stopped and the mud gate device to be reinstalled, reducing dredging efficiency. Furthermore, due to the increased mud storage in the mud tank, the mud gates formed by the original design methods are no longer sufficient to meet strength requirements. The edges and corners of the mud gate are prone to bending and deformation, reducing the sealing effect of the mud tank. The mud gate panel in contact with the mud will be eroded by the mud, reducing its thickness and posing a risk of damage due to insufficient strength. Summary of the Invention

[0004] The purpose of this invention is to provide a design method for a mud gate device, a dredging vessel, and a mud gate device, thereby improving the service life of the mud gate device and thus improving the operational efficiency of dredging projects.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A mud gate device, comprising:

[0007] Two mud door bodies are arranged opposite each other. Each mud door body includes a first panel, a second panel and a reinforcing member. The reinforcing member surrounds the top surface of the second panel. The first panel is fixedly connected to the side of the reinforcing member away from the second panel. The thickness of the first panel is greater than the thickness of the second panel.

[0008] The drive assembly includes a main drive rod, driven rods, and a drive member. The top end of the main drive rod is driveably connected to the drive member, and the bottom end of the main drive rod is rotatably connected to two driven rods. The other ends of the two driven rods are rotatably connected to two mud gate bodies, respectively. The drive member can drive the main drive rod to descend, causing the two driven rods to move, so that the two mud gate bodies rotate in opposite directions; or, the drive member can drive the main drive rod to rise, causing the two driven rods to move, so that the two mud gate bodies rotate towards each other.

[0009] A limiting pin is provided, which can be inserted into the drive rod to limit the lifting and lowering movement of the drive rod. The limiting pin has a weight reduction notch.

[0010] In the aforementioned mud gate device, the weight reduction notch is located at the bottom end of the limiting pin, and the weight reduction notch is an arched notch.

[0011] In the aforementioned mud door device, each of the two first panels is provided with an elastic sealing strip on the side that is close to each other.

[0012] A dredging vessel includes the aforementioned mud gate device. The dredging vessel includes a mud chamber, a hull bottom plate, and hull lugs. The hull bottom plate has a mud inlet and outlet. The hull lugs are welded and fixed to the hull bottom plate. The mud chamber is connected to the mud inlet and outlet. The mud gate body is rotatably connected to the hull lugs. The two mud gate bodies can be rotated in opposite directions to open the mud inlet and outlet, allowing mud to enter or exit the mud chamber. The two mud gate bodies can be rotated in opposite directions to close the mud inlet and outlet, allowing the mud chamber to store mud.

[0013] The aforementioned dredging vessel, wherein the mud gate device further includes a limiting sleeve, which is fixedly connected to the top of the mud hopper and encloses at least a portion of the drive rod, which is slidable within the limiting sleeve.

[0014] In the aforementioned dredging vessel, the limiting sleeve has a first limiting hole extending radially along the limiting sleeve, and the drive main rod has a second limiting hole extending radially along the drive main rod. The limiting pin can be inserted into the first limiting hole and the second limiting hole to limit the movement of the drive main rod.

[0015] A design method for a mud gate device, used to design the aforementioned mud gate device, comprising:

[0016] The formula for calculating the thickness of the mud door panel is optimized. A formula for calculating the thickness of the mud door panel that includes wear parameters is designed. The thicknesses of the first panel and the second panel are calculated based on the optimized formula for calculating the thickness of the mud door panel.

[0017] The wall thickness calculation formula for the pipe fitting is optimized, a wall thickness calculation formula for the pipe fitting that includes the wear factor is designed, and the wall thickness of the drive rod is calculated based on the optimized wall thickness calculation formula for the pipe fitting.

[0018] The weld strength calculation formula was optimized, and a weld strength calculation formula incorporating the seawater corrosion coefficient was designed. The strength of the weld between the bottom plate and the ear plate of the hull was then calibrated based on the optimized weld strength calculation formula.

[0019] The above-mentioned design method for the mud gate device includes the following optimized formula for calculating the mud gate panel thickness:

[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] represents the allowable stress of the materials selected for the first panel and the second panel;

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

[0026] C2 is the rectangular flatness 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' represents the length of the opening in the bottom plate of the hull.

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

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

[0032] T represents the design life of the mud gate body;

[0033] C represents the seawater corrosion allowance.

[0034] The design method for the above-mentioned mud gate device includes the following optimized formula for calculating the wall thickness of the pipe fittings:

[0035]

[0036] In the above formula,

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

[0038] λ is the wear factor, and based on actual ship test results, a value of 0.15-0.25 is recommended.

[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 opening in the bottom plate of the hull;

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

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

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

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

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

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

[0051]

[0052] In the above formula,

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

[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 This 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 Let be the moment of inertia at the centroid of the hull's ear plate;

[0060] x2 is the vertical distance from the centroid of the hull lug to the weld.

[0061] y2 is the normal phase distance between the centroid of the hull lug and the weld.

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

[0063] [τ] represents the allowable stress of the material used for the hull lugs.

[0064] The beneficial effects of this invention are:

[0065] The mud gate device provided by the present invention includes a mud gate body and a drive assembly. The mud gate body includes a first panel and a second panel. A reinforcing member is connected between the first panel and the second panel to support the first panel and the second panel, prevent the first panel and the second panel from bending and deforming, and improve the sealing performance of the mud gate 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, prevent the first panel from breaking, and improve stability.

[0066] The design method for the dredging device provided by this invention incorporates parameters such as seawater salinity, seawater temperature, dissolved oxygen in seawater, and seawater pH value into the weld calculation formula. This allows for a more accurate simulation of the weld environment in seawater, improving the accuracy of weld strength verification, reducing the possibility of weld failure, and enhancing the stability of the connection between the dredging device and the hull. It eliminates the need to stop the ship to inspect for weld failure or to stop the ship to reinstall the dredging device due to weld failure, thus improving dredging efficiency. Simultaneously, the invention introduces wear parameters into the original formula for calculating the thickness of the dredging device, improving the accuracy of thickness calculation. This allows for a reduction in the thickness of the dredging device while meeting strength requirements, thereby saving costs.

[0067] The dredging vessel provided by this invention is equipped with a mud gate device designed using a mud gate device design method. During the design phase, the scouring of the first panel by mud was considered, and the thickness of the first panel was increased to ensure that the first panel meets the strength requirements. The influence of seawater on the weld was considered 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 thus improving the dredging efficiency. Attached Figure Description

[0068] Figure 1 This is a schematic diagram of the mud gate device provided in an embodiment of the present invention;

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

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

[0071] Figure 4 yes Figure 3 A schematic diagram of the method at point B;

[0072] Figure 5 This is a schematic diagram of the fit between the mud gate body and the hull lugs provided in an embodiment of the present invention;

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

[0074] Figure 7 yes Figure 6A schematic diagram of the method at point C;

[0075] Figure 8 This is a schematic diagram of the structure of the limiting pin provided in an embodiment of the present invention;

[0076] Figure 9 This is a schematic diagram of the host computer interface for the mud gate device design provided in 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. Reinforcing member;

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

[0080] 40. Limiting sleeve;

[0081] 50. Connecting hinge seat;

[0082] 60. Protective sleeve;

[0083] 70. Placement base;

[0084] 100. Hull lugs. Detailed Implementation

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

[0086] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal 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 specific embodiments.

[0089] The mudgate device, dredging vessel, and design method of the mudgate device provided by this invention can improve the service life of the mudgate device, thereby improving the operational efficiency of dredging projects.

[0090] like Figures 1-9 As shown, the mud gate device includes two mud gate bodies 10 arranged opposite each other and a drive assembly 20. Each mud gate body 10 includes a first panel 101, a second panel 102, and a reinforcing member 103. The reinforcing member 103 surrounds the top surface of the second panel 102. The first panel 101 is fixedly connected to the side of the reinforcing member 103 away from the second panel 102. The thickness of the first panel 101 is greater than the thickness of the second panel 102. The drive assembly 20 includes a drive main rod 201, a drive slave rod 202, and a drive member. The top end of the drive main rod 201 is connected to the drive member for transmission. The bottom end of the shaft is rotatably connected to two driven rods 202, and the other ends of the two driven rods 202 are rotatably connected to two mud gate bodies 10 respectively. The driving component can drive the main driving rod 201 to descend and drive the two driven rods 202 to move, so that the two mud gate bodies 10 rotate in opposite directions; or, the driving component can drive the main driving rod 201 to rise and drive the two driven rods 202 to move, so that the two mud gate bodies 10 rotate towards each other. The limiting pin 30 can be inserted into the main driving rod 201 to limit the lifting and lowering movement of the main driving rod 201. The limiting pin 30 has a weight reduction notch 301.

[0091] The mud gate device provided by the present invention includes a mud gate body 10 and a drive assembly 20. The mud gate body 10 includes a first panel 101 and a second panel 102. A reinforcing member 103 is connected between the first panel 101 and the second panel 102 to support the first panel 101 and the second panel 102, preventing the first panel 101 and the second panel 102 from bending and deforming, and improving the sealing performance of the mud gate device. The thickness of the first panel 101 is greater than the thickness of the second panel 102, which can ensure that the first panel 101 still has sufficient strength after being washed by mud, preventing the first panel 101 from breaking 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, the first panel 101 is located close to the mud tank. As the dredging vessel travels, the mud in the mud tank sloshes and washes against the surface of the first panel 101. During the discharge of mud, the mud also washes against the surface of the first panel 101, resulting in a reduction in the thickness of the first panel 101, thus reducing its strength and service life. Therefore, having a greater thickness for the first panel 101 than the second panel 102 satisfies the strength requirements and improves the service life of the mud gate device, while eliminating the need to increase the thickness of the second panel 102 and reducing costs.

[0093] Specifically, the surface of the first panel 101 subjected to erosion is reinforced by overlaying a wear-resistant alloy onto the surface of the first panel 101 to improve wear resistance and thus extend its service life. The wear-resistant alloy can be a high-chromium alloy.

[0094] The reinforcing member 103 supports the first panel 101 and the second panel 102, preventing the first panel 101 and / or the second panel 102 from bending and deforming under stress, which would affect the sealing performance of the mud gate device. For example, see... Figure 1 , Figure 2 and Figure 5 The reinforcing member 103 is a frame structure. The reinforcing member 103 is arranged around the first panel 101, and no reinforcing member 103 is arranged 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 subjected to pressure and compress the reinforcing member 103. The reinforcing member 103 bears the load and avoids the first panel 101 and / or the second panel 102 from deforming under pressure, thereby improving the sealing performance of the mud gate device.

[0095] The reinforcing member 103 is disposed between the first panel 101 and the second panel 102, which enhances the structural stability and overall load-bearing capacity of the mud gate body 10, avoids the occurrence of the middle rising and the ends sinking during long-term use of the mud gate body 10, ensures the sealing of the mud gate device, and thus ensures that the mud in the mud chamber will not leak, thereby improving the dredging efficiency of the dredging vessel.

[0096] The present invention also provides a dredging vessel including the above-mentioned mud gate device. The dredging vessel includes a mud tank, a hull bottom plate, and hull ear plates 100. The hull bottom plate has a mud inlet and outlet. The hull ear plates 100 are welded and fixed to the hull bottom plate. The mud tank is connected to the mud inlet and outlet. The mud gate body 10 is rotatably connected to the hull ear plates 100. The two mud gate bodies 10 can open the mud inlet and outlet by rotating in opposite directions, so that mud can enter or exit the mud tank. The two mud gate bodies 10 can close the mud inlet and outlet by rotating in opposite directions, so that the mud tank can store mud.

[0097] The dredging vessel provided by the present invention is equipped with a mud gate device designed by the mud gate device design method. During the design stage, the scouring of the first panel 101 by mud was taken into account, and the thickness of the first panel 101 was increased to ensure that the first panel 101 meets the strength requirements. The influence of seawater on the weld was taken into account 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 thus improving the dredging efficiency.

[0098] The mudgate device is rotatably connected to the hull of the dredging vessel. See the embodiment below. Figure 1 , Figure 2 and Figure 5 The reinforcing members 103 on the opposite sides of the two first panels 101 are each provided with a connecting hinge seat 50. The connecting hinge seat 50 can be rotatably connected to the hull ear plate 100, which is convenient for connection. Moreover, the hinged connection method makes the rotation of the mud gate body 10 relative to the hull smoother.

[0099] Further, see Figure 2 and Figure 5 Each reinforcing member 103 is provided with two connecting hinge seats 50, and the two connecting hinge seats 50 are spaced apart along a first direction, such as... Figure 1 As shown in the X direction, a protective sleeve 60 is also provided between the two connecting hinge seats 50. The protective sleeve 60 extends along the first direction and is fixedly connected to the reinforcing member 103. During connection, the two connecting hinge seats 50 are connected to the hull lugs 100 on the hull. A rotating shaft is inserted into the connecting hinge seats 50, the hull lugs 100, and the protective sleeve 60, allowing the mud gate device to rotate around the rotating shaft. The two connecting hinge seats 50 can 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 improving its service life.

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

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

[0102] Drive assembly 20 is used to drive the mud gate body 10 to rotate. In this embodiment, see [link to documentation]. Figure 1 and Figure 2 A connecting lug 1011 is fixedly connected to the first panel 101, and the drive assembly 20 is rotatably connected to the connecting lug 1011. The rotatable connection can prevent the two mud gate bodies 10 from interfering with the drive rod 202 when they move in opposite directions or towards each other, thus improving the smoothness of movement.

[0103] The driving component can be a hydraulic cylinder. A hydraulic cylinder has a large driving force, capable of driving the main drive rod 201 to move, causing the two mud gate bodies 10 to rotate in opposite directions or towards each other. In operation, the hydraulic cylinder's hydraulic rod extends, causing the main drive rod 201 to move downwards. The main drive rod 201 then drives the two driven rods 202 downwards, pushing the two mud gate bodies 10. The two mud gate bodies 10 rotate in opposite directions, opening the mud inlet and outlet to discharge mud from the mud chamber or to perform mud loading operations. Because the mud gate bodies 10 and the driven rods 202 are rotatably connected, the opposite rotation of the two mud gate bodies 10 causes the two driven rods 202 to rotate around the main drive rod 201, ensuring the connection between the driven rods 202 and the mud gate bodies 10.

[0104] Specifically, the mud gate device also includes a limiting sleeve 40, which is fixedly connected to the top of the mud chamber and encloses at least a portion of the drive rod 201. The drive rod 201 can slide within the limiting sleeve 40. Because the drive rod 201 slides within the limiting sleeve 40, it does not need to contact the mud, reducing the erosion of the drive rod 201 by the mud and improving its service life.

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

[0106] To improve the sealing performance of the mud gate body 10 at the mud slurry inlet and outlet, in this embodiment, the limiting sleeve 40 has a first limiting hole extending radially along the limiting sleeve 40, and the driving main rod 201 has a second limiting hole extending radially along the driving main rod 201. The limiting pin 30 can be inserted into the first and second limiting holes to limit the movement of the driving main rod 201. The hole-shaft fit is convenient and stable, facilitating the insertion and removal of the limiting pin 30 by the operator.

[0107] Specifically, see Figure 8The weight reduction notch 301 is opened at the bottom end of the limiting pin 30. The weight reduction notch 301 is an arched notch. Due to gravity, the two mud gate bodies 10 rotate downward, driving the driven rod 202 and the driving rod 201 to move downward. After the limiting pin 30 is inserted into the first limiting hole and the second limiting hole, its top will be subjected to the shearing force of the driving rod 201. Therefore, the weight reduction notch 301 is opened at the bottom end of the limiting pin 30 to ensure that the strength of the limiting pin 30 meets the requirements and can withstand the shearing force applied to the limiting pin 30 by the driving rod 201, ensuring that the mud gate body 10 will not rotate downward, effectively sealing the mud inlet and outlet, and improving the efficiency of dredging vessels in transporting mud.

[0108] Meanwhile, through finite element modeling and analysis, the weight of the limiting pin 30 is reduced by about 20% while ensuring that the limiting pin 30 has sufficient load-bearing capacity, making it easier for workers to insert and remove the pin and reducing the workload of workers.

[0109] Specifically, the limiting pin 30 is made of Q460 material to improve its strength.

[0110] In other instances, the weight reduction notch 301 can also be a circular notch, an elliptical notch, or a rectangular notch.

[0111] To further reduce the workload of staff handling the limit pin 30, see [link / reference] 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 pin 30, reducing the handling of the limiting pin 30, alleviating the workload 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 gate bodies 10 on the mud chamber. Specifically, the elastic sealing strips can be fluororubber. Fluororubber has strong corrosion resistance and excellent resistance to seawater, salt spray and acid and alkali substances, which can prevent seawater erosion and improve service life.

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

[0114] The wall thickness calculation formula for the pipe fittings was optimized, and a wall thickness calculation formula for the pipe fittings that includes the wear factor was designed. The wall thickness of the drive rod 201 was calculated based on the optimized wall thickness calculation formula for the pipe fittings.

[0115] The weld strength calculation formula was optimized, and a weld strength calculation formula incorporating the seawater corrosion coefficient was designed. The strength of the weld between the bottom plate and the ear plate of the hull was calibrated based on the optimized weld strength calculation formula.

[0116] The design method for the dredging device provided by this invention incorporates parameters such as seawater salinity, seawater temperature, dissolved oxygen in seawater, and seawater pH value into the weld calculation formula. This allows for a more accurate simulation of the weld environment in seawater, improving the accuracy of weld strength verification, reducing the possibility of weld failure, and enhancing the stability of the connection between the dredging device and the hull. It eliminates the need to stop the ship to inspect for weld failure or to stop the ship to reinstall the dredging device due to weld failure, thus improving dredging efficiency. Simultaneously, the invention incorporates wear parameters into the calculation formula for the dredging panel thickness, improving the accuracy of thickness calculation. This allows for a reduction in the thickness of the dredging panel while meeting strength requirements, thereby saving costs.

[0117] Specifically, the optimized formula for calculating 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 materials 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 dimension of the opening of the hull bottom plate, b is the width dimension of the opening of the hull bottom plate, 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 gate 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 values ​​of the calculation results in the optimized mudgate panel thickness calculation formula, to ensure that the strength of the first panel 101 and / or the second panel 102 meets the usage requirements, avoid damage, and improve dredging efficiency.

[0121] It should be noted that the first panel 101 is located above the second panel 102. When the two mud gate bodies 10 seal the mud inlet and outlet, the mud in the mud chamber washes over the surface of the first panel 101, resulting in a reduction in the thickness of the first panel 101. To avoid damage due to insufficient strength of the first panel 101, a wear parameter r is introduced when calculating the thickness of the first panel 101. This ensures that the first panel 101 still has sufficient strength after being worn by the mud scouring, thus improving the stability of the mud gate device. The second panel 102 is basically unaffected by the mud scouring. Therefore, wear can be disregarded when calculating the thickness of the second panel 102. Under the premise of meeting strength requirements, the thickness of the second panel 102 can be reduced to save costs.

[0122] The optimized formula for calculating the thickness of the mud gate panel is 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 due to 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 lateral clearance between the mud gate body 10 and the hull of the dredging vessel, a2 is the longitudinal clearance between the mud gate body 10 and the hull of the dredging vessel, and a3 is the clearance between the two mud gate bodies 10.

[0125] Specifically, the optimized formula for calculating the wall thickness of the 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 component 20. According to the dredging operation test results of the dredging vessel, the recommended value of the wear factor λ is 0.15 to 0.25, ρ1 is the specific gravity of the mud, ρ2 is the specific gravity of the seawater, g is the gravitational acceleration, 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 dimension of the opening of the bottom plate of the hull, 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 in 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 chamber and remains within it for extended periods. During loading and unloading, the mud slurry washes over the drive assembly 20, which is not enclosed by the limiting sleeve 40, causing wear and reducing its lifespan. Therefore, the optimized pipe fitting wall thickness calculation formula incorporates a wear factor λ to ensure the drive assembly 20's lifespan meets practical application requirements. This optimized formula can also be used to calculate the wall thickness of the limiting sleeve 40, as the upper part of the mud chamber is mostly clear water, and the limiting sleeve 40 is largely unaffected by mud slurry washout; wear can be disregarded in the calculation.

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

[0130]

[0131] 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, and A f Let x1 be the effective area of ​​the weld, y1 be the effective width of the weld in the horizontal direction, and y1 be the effective width of the weld in the vertical direction. f y2 is the moment of inertia at the centroid of the hull lug 100, x2 is the vertical distance from the centroid of the hull lug 100 to the weld, y2 is the normal distance from the centroid of the hull lug 100 to the weld, δ is the seawater corrosion coefficient, which is taken as 1≤δ≤2 according to the actual ship test data, and [τ] is the allowable stress of the material used for the hull lug 100.

[0132] The optimized weld strength calculation formula fully considers the impact of seawater erosion on the weld, incorporating factors such as salinity, temperature, dissolved oxygen content, and pH value into the influencing factors. The calculation results are more accurate and can reflect the strength of the weld in seawater, avoiding weld failure that could lead to the separation of the hull lug 100 from the dredging vessel. This enhances the connection stability between the hull lug 100 and the hull, ensures the stability of the mud gate device, and improves dredging efficiency.

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

[0134] This invention also provides mudgate modeling software, see [link / reference]. Figure 9 By inputting the length and width of the opening in the hull bottom plate, 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 lateral clearance between the mud gate body 10 and the hull of the dredging vessel, the longitudinal clearance 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 host computer interface, the design scheme of the mud gate device can be generated quickly, improving design efficiency.

[0135] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A mud gate device, characterized in that, include: Two mud door bodies (10) are arranged opposite each other. Each mud door body (10) includes a first panel (101), a second panel (102), and a reinforcing member (103). The reinforcing member (103) surrounds the top surface of the second panel (102). The first panel (101) is fixedly connected to the side of the reinforcing member (103) away from the second panel (102). The thickness of the first panel (101) is greater than the thickness of the second panel (102). The drive assembly (20) includes a drive main rod (201), drive slave rods (202), and a drive member. The top end of the drive main rod (201) is connected to the drive member, and the bottom end of the drive main rod (201) is rotatably connected to the two drive slave rods (202). The other ends of the two drive slave rods (202) are rotatably connected to the two mud gate bodies (10). The drive member can drive the drive main rod (201) to descend, causing the two drive slave rods (202) to move, so that the two mud gate bodies (10) rotate in opposite directions; or, the drive member can drive the drive main rod (201) to rise, causing the two drive slave rods (202) to move, so that the two mud gate bodies (10) rotate towards each other. A limiting pin (30) is provided, which can be inserted into the drive rod (201) to limit the lifting and lowering movement of the drive rod (201). The limiting pin (30) is provided with a weight reduction notch (301).

2. The mud gate device according to claim 1, characterized in that, The weight reduction notch (301) is located at the bottom end of the limiting pin (30), and the weight reduction notch (301) is an arched notch.

3. The mud gate device according to claim 1, characterized in that, Both of the first panels (101) are provided with elastic sealing strips on the sides that are close to each other.

4. A dredging vessel, comprising the mudgate device according to any one of claims 1-3, characterized in that, The dredging vessel includes a mud tank, a bottom plate, and hull lugs (100). The bottom plate has a mud inlet and outlet. The hull lugs (100) are welded and fixed to the bottom plate. The mud tank is connected to the mud inlet and outlet. The mud gate body (10) is rotatably connected to the hull lugs (100). The two mud gate bodies (10) can open the mud inlet and outlet by rotating in opposite directions, so that the mud can enter or exit the mud tank. The two mud gate bodies (10) can close the mud inlet and outlet by rotating in opposite directions, so that the mud tank can store mud.

5. The dredging vessel according to claim 4, characterized in that, The mud gate device also includes a limiting sleeve (40), which is fixedly connected to the top of the mud chamber and covers at least part of the drive rod (201), and the drive rod (201) can slide within the limiting sleeve (40).

6. The dredging vessel according to claim 5, characterized in that, The limiting sleeve (40) has a first limiting hole that extends in the radial direction of the limiting sleeve (40). The driving main rod (201) has a second limiting hole that 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 gate device, used to design a mud gate device as described in any one of claims 1-3, characterized in that, include: The formula for calculating the thickness of mud door panels is optimized. A formula for calculating the thickness of mud door panels including wear parameters is designed. The thicknesses of the first panel (101) and the second panel (102) are calculated based on the optimized formula for calculating the thickness of mud door panels. The wall thickness calculation formula of the pipe fitting is optimized, the wall thickness calculation formula of the pipe fitting including the wear factor is designed, and the wall thickness of the drive rod (201) is calculated according to the optimized wall thickness calculation formula of the pipe fitting. The weld strength calculation formula was optimized, and a weld strength calculation formula including the seawater corrosion coefficient was designed. The strength of the weld between the bottom plate and the ear plate (100) of the hull was calibrated according to the optimized weld strength calculation formula.

8. The design method of the mud gate device according to claim 7, characterized in that, The optimized formula for calculating 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] represents the allowable stress of the materials selected for the first panel (101) and the second panel (102); C1 is the rectangular flatness 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' represents the length of the opening in the bottom plate of the hull. b is the width of the opening in the bottom plate of the hull, where b is greater than or equal to 0.5a; r is the wear rate of the first panel (101); T represents the design life of the mud gate body (10); C represents the seawater corrosion allowance.

9. The design method of the mud gate device according to claim 7, characterized in that, The optimized formula for calculating the wall thickness of the pipe fitting is as follows: ； In the above formula, d represents the wall thickness of the pipe fitting to be calculated; λ is the wear factor, and based on actual ship test results, a value of 0.15 - 0.25 is recommended. 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 opening in the bottom plate of the hull; a1 is the lateral clearance between the mud gate body (10) and the dredging vessel; a2 is the longitudinal clearance between the mud gate body (10) and the dredging vessel; a3 is the gap between the two mud gate bodies (10); d2 is the inner diameter of the pipe fitting to be calculated; [τ] represents the allowable stress of the material used in the pipe fitting to be calculated; ψ is the reduction factor for the pipe fitting to be calculated, which is determined by the flexibility of the pipe fitting.

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