Non-standard swing platform of chain drive ship with dispersion bearing capacity

Abstract

This invention discloses a chain-driven non-standard ship swaying platform with distributed load-bearing capacity, belonging to the technical field of ship simulation testing equipment. It aims to solve the problems of high cost, cumbersome operation, insufficient load-bearing capacity, poor stability, and low adaptability of existing equipment. It adopts a modular design, consisting of a base, platform module, chain-driven module, and control module. By adjusting the installation angle of the upper testing system, it can meet the simulation requirements of roll, pitch, and bow. The equipment has a maximum load capacity of 500 kg, supports sway angles of ±5° / ±10° / ±20° / ±40° and precise switching of sway cycles of 10s / 20s / 30s, and can operate continuously and stably for over 3000 hours. It is easy to operate, low in cost, and can accurately reproduce sway states under different sea conditions, making it suitable for scenarios such as ship component performance testing and chemical sloshing stability studies, ensuring accurate test results.

Description

Technical Field

[0001] This invention belongs to the technical field of ship simulation testing equipment, specifically relating to a non-standard swaying platform for simulating the rolling motion of a ship with a single rotational degree of freedom at sea. This equipment can meet the simulation requirements for roll, pitch, and bow by adjusting the installation angle of the upper testing system. For tests with low precision requirements for six-degree-of-freedom motion, this invention simulates rolling, pitch, or bow conditions using a single rotational degree of freedom, making it suitable for performance testing and experimental verification of ship-related components. Background Technology

[0002] When ships navigate in the ocean, they are subjected to external forces such as waves, resulting in complex six-degree-of-freedom motions. These include three translational degrees of freedom (sway, roll, and heave) and three rotational degrees of freedom (roll, pitch, and yaw). Related literature confirms that, under most practical operating conditions, the rolling rotational degrees of freedom, represented by the roll, dominate.

[0003] In the field of ship-related testing, some scenarios do not require high accuracy in simulating six-degree-of-freedom motion. For example, experiments studying the impact of swaying phenomena on the stability of chemicals can meet the core testing requirements simply by simulating swaying rotational degrees of freedom. Using a complex and expensive six-degree-of-freedom motion simulation platform for such tests would waste equipment resources and increase testing costs. Therefore, the development of a ship swaying platform with a relatively simplified structure and controllable cost to achieve swaying tests with a single rotational degree of freedom, while flexibly adjusting the installation angle of the upper testing system to adapt to the simulation requirements of roll, pitch, and bow, has become an urgent need in such testing scenarios.

[0004] Currently, existing single swing tables mainly employ two drive structures: the first is the crank-rocker drive type, which requires adjusting the swing amplitude of the table by changing connecting rods of different lengths. Each adjustment necessitates stopping the machine, disassembling the equipment, and replacing parts, making the operation cumbersome and time-consuming, severely reducing experimental efficiency. The second is the direct motor drive type, which relies on the forward and reverse rotation of the motor to directly drive the table to swing. The gravitational torque generated by the platform body and the test load it bears is entirely borne by the motor. This places extremely high demands on the motor's output torque and shaft impact resistance, significantly increasing the difficulty of motor selection and equipment procurement costs. Furthermore, the motor operates under high load for extended periods, making it prone to overheating, torque attenuation, and other malfunctions, severely affecting the long-term stable operation of the equipment.

[0005] In summary, existing single swing platforms suffer from technical defects such as cumbersome operation, low experimental efficiency, high motor load, high cost, and poor stability, making it difficult to meet the requirements for efficient, economical, and stable use in relevant experimental scenarios. Therefore, there is an urgent need to develop a structurally optimized and reliable ship swing platform to solve the above-mentioned problems of existing technologies. Summary of the Invention

[0006] I. Purpose of the Invention The purpose of this invention is to overcome the shortcomings of existing technologies and provide a chain-driven non-standard swaying platform for ships with distributed load-bearing. Through modular structural design and precise transmission control, it solves the technical problems of high cost, cumbersome operation, weak load-bearing capacity, poor stability, and low adaptability. Its innovation is reflected in the following aspects: (1) Structural design: The modular combination is adopted, and the base, table module, chain drive module and control module are independently integrated. The chain drive realizes the motion conversion of "motor power → chain lifting → table swinging", replacing the traditional center drive method, and shifting the driving force to the side of the platform, distributing the load to the table, support legs and cylindrical roller bearing assembly, which significantly reduces the motor load.

[0007] (2) Precise parameter control: It supports electronic switching of multiple roll angles (±5°, ±10°, ±20°, ±40°) and cycles (10s, 20s, 30s), without the need for mechanical disassembly and assembly, thus improving the ease of operation and sea condition adaptability.

[0008] (3) High reliability and economy: Using general-purpose components (such as square tube frame and standard bearings) to achieve a maximum load of 500kg and continuous operation of more than 3000 hours, reducing manufacturing costs and maintenance requirements.

[0009] II. Device Composition and Structural Function This invention relates to a distributed load-bearing chain-driven non-standard swaying platform for ships, which adopts a modular design and consists of four parts: a base, a platform module, a chain-driven module, and a control module. Each module is structurally independent yet coordinated in transmission. The specific structure and functions are as follows: (a) Base As the overall supporting foundation for the equipment, the base uses square tubing welded to form a rigid frame, ensuring overall load-bearing stability. A base support plate is fixedly installed on the upper part of one side of the base, providing a unified installation reference surface for the control cabinet, sprocket support frame, and motor base, ensuring the coaxiality and positional accuracy of each functional module during assembly, and avoiding transmission jamming or uneven structural stress caused by assembly deviations.

[0010] (ii) Countertop Module It is responsible for bearing the test load and performing the lateral motion. The core consists of a platform, support legs, platform connecting blocks, swing table guide rails, and supporting reinforcing structures. 1. Tabletop: The tabletop is constructed with a square tube as the load-bearing frame, welded to a thick cold-rolled steel plate, balancing structural rigidity with lightweight design. An extension arm extends integrally from one side of the tabletop, with reinforcing ribs added at the connection point to effectively prevent structural fatigue deformation under long-term swaying motion. A swing table guide rail is laid parallel to each of the upper and lower sides of the extension arm, with baffles fixed at the ends of the guide rails to limit the overtravel of the subsequent sliders and prevent damage from component collisions.

[0011] 2. Support legs: Rectangular hollow steel sections are used, and reinforcing ribs are added at the connection between the support legs and the base to improve the structure's resistance to overturning; the bottom of the support legs is rigidly connected to the base with bolts to ensure support stability.

[0012] 3. Tabletop connecting block: One end is fixedly connected to the bottom of the tabletop, and the other end is rotatably connected to the support leg through a cylindrical roller bearing assembly. The two are reserved with matching mounting holes, through which the cylindrical roller bearing assembly passes. This ensures that the tabletop swings smoothly around the support leg without jamming, and also bears and distributes the gravitational torque through the bearing, so that the overall structure meets the maximum load requirement of 500kg. At the same time, it stabilizes the center of gravity of the tabletop module and prevents the tabletop from tilting or shaking during the swinging process.

[0013] 4. Two swing table sliders: each with a T-shaped or dovetail cross-section, which slide in conjunction with the upper and lower swing table guide rails on the table extension arm to ensure smooth sliding without significant movement; each swing table slider is provided with four countersunk bolt holes for fixing to the swing table slider connector with bolts to achieve synchronous movement of the two.

[0014] 5. Slide Table Slider Connector: The overall structure is a portal frame. Four bolt through holes are set on the upper and lower sides, corresponding to the countersunk bolt holes of the slide table slider. The slide table slider connector is rigidly connected to the slide table slider by bolts. A pin through hole is set in the center of the side of the slide table slider connector. The diameter of the hole matches the pin through hole of the chain connector. The two are rotatably connected by the pin. This rotatable structure can eliminate motion interference between chain lifting and the swing of the platform, ensuring smooth power transmission.

[0015] (III) Chain-type drive module As the core transmission mechanism for the lateral motion, it realizes the conversion of motion from "motor power → chain lifting → table swinging". It mainly includes components such as sprocket support frame, chain, sprocket, bushing, chain guide rail, chain slider, swing table slider, chain connector, and swing table slider connector. 1. Sprocket support frame: It is formed by welding the left and right support channel steels and the upper and lower connecting cover plates to form a rigid frame; the sprocket support frame is fixedly connected to the base support plate by bolt fasteners to ensure structural stability and no displacement during transmission; a chain guide rail is set parallel to the outer side of the right support channel steel to provide directional sliding guidance for the chain slider, and sprocket mounting holes are reserved on the support channel steel.

[0016] 2. Sprockets and Chains: A sprocket with gears is mounted on the upper and lower parts of the sprocket support frame. The gears on the sprockets mesh with the chain for transmission. The lower sprocket is the driving sprocket, which rotates after receiving power from the motor. Through the meshing of the gears and the chain, it drives the upper driven sprocket to rotate synchronously, ultimately achieving stable lifting and lowering of the chain along the vertical direction of the sprocket support frame.

[0017] 3. Bushing: It is inserted through the sprocket mounting hole fixed on the support channel steel, and limits the sprocket between the left and right support channel steels. This ensures that the sprocket can rotate freely, while also limiting the lateral displacement of the sprocket, ensuring the meshing accuracy of the chain and gear, and preventing the transmission from slipping.

[0018] 4. Chain guide rail: Fixed to the outer side of the support channel steel on the right side of the sprocket support frame. The length of the guide rail is consistent with the chain lifting stroke. The cross-section is T-shaped or dovetail-shaped, forming an anti-detachment fit with the chain slider.

[0019] 5. Chain slider: It slides with the chain guide rail. The inner side of the chain slider is provided with a groove that matches the chain guide rail to ensure no lateral offset during sliding. The chain slider is provided with four countersunk bolt holes for fixing to the chain slider connector with bolts to achieve synchronous movement between the two.

[0020] 6. Chain connector: It consists of a "door frame structure + outreach arm structure". The door frame structure is rotatably connected to the swing table slider connector through a pin, and is also connected to the connecting bolt fixed to one end of the chain link through bolt fasteners, so as to fix the chain connector and the chain and achieve synchronous lifting and lowering. The outreach arm structure is fixed to the chain slider, thereby realizing the synchronous lifting and lowering of the chain and the chain slider.

[0021] The device design of this invention enables the linear lifting motion of the chain to be smoothly converted into the oscillating motion of the table surface around the cylindrical roller bearing assembly through the sliding of the slider along the guide rail and the rotation of the connecting parts, ultimately achieving precise adjustment of the yaw angle.

[0022] (iv) Control Module To achieve precise control of roll parameters and equipment operation, including motors, reducers and control cabinets.

[0023] Power Output: An innovative transmission layout design transfers the force driving the platform module's swing from the platform center to the platform extension arm on the side, acting on one side of the platform via a reciprocating chain transmission. This design effectively distributes the load generated by the test object above the platform to the platform, support legs, and cylindrical roller bearing assembly, significantly reducing the torque load on the motor and lessening the equipment's dependence on motor drive precision and structural strength, thereby improving the operational reliability and economy of the swing platform. Simultaneously, the motor output power is reduced and amplified by a matching reducer before being transmitted to the drive sprocket. The meshing transmission between the sprocket and chain achieves smooth power transmission. Combined with the guiding and limiting functions of the chain guide rail and chain slider, this ensures transmission precision and stability during power conversion, providing reliable power for accurate simulation of the platform's lateral swing motion.

[0024] Parameter control: The control cabinet has a built-in dedicated control program, which allows users to set the target roll angle (±5°, ±10°, ±20°, ±40°) and roll period (10s, 20s, 30s) according to the test requirements. The control program will automatically match the motor speed and forward and reverse frequency to achieve accurate simulation of roll motion under different sea conditions. It also has equipment operation status monitoring and abnormal shutdown protection functions to improve the safety of use.

[0025] (II) Operation Mode This invention relates to a chain-driven non-standard swaying platform for ships with distributed load-bearing. The chain-driven module is controlled by a control module, which in turn drives the platform module to rotate around cylindrical roller bearing assemblies to achieve precise rolling motion. All components work together to simulate rolling motion under different sea conditions. The specific operating procedure is as follows: (1) Parameter preset stage Based on the simulated sea conditions required for the experiment, the target roll parameters are set through the control cabinet of the control module, including roll angle (selectable at four levels: ±5°, ±10°, ±20°, and ±40°) and roll period (selectable at three levels: 10s, 20s, and 30s). The control cabinet has a built-in control program that automatically matches the motor speed and forward / reverse frequency according to the preset parameters, ensuring that the roll motion accurately matches the set requirements.

[0026] (2) Drive start-up and power transmission stage The motor of the start-up control module operates in both forward and reverse directions according to the preset parameters of the control cabinet. Its output power is reduced and amplified by a matching reducer before being precisely transmitted to the drive sprocket at the bottom of the sprocket support frame. When the motor rotates forward, the lower drive sprocket rotates clockwise under power, driving the chain upwards along the vertical direction of the sprocket support frame through the meshing of the sprocket gears. When the motor rotates in reverse, the lower drive sprocket rotates counterclockwise synchronously, similarly driving the chain downwards along the vertical direction through gear meshing. During this process, the driven sprocket at the top of the sprocket support frame rotates synchronously with the chain. This serves two purposes: firstly, it guides the chain's trajectory, preventing chain deviation and tooth breakage; secondly, its structural characteristics provide stable tension to the chain, ensuring that the chain remains taut during both forward and reverse rotation, thus guaranteeing overall transmission stability and power transmission efficiency.

[0027] (3) Transition phase of lateral motion This invention relates to a chain-driven non-standard swaying platform for ships with distributed load-bearing capabilities, enabling swaying tests with a single rotational degree of freedom. By adjusting the installation angle of the upper testing system, simulation requirements for roll, pitch, and yaw can be met. During the roll motion conversion, as the chain rises and falls, the chain connector, fixedly connected to the chain, moves synchronously up and down with the chain. Since the chain connector is rotatably connected to the swaying platform slider connector via a pin, and the swaying platform slider connector is rigidly fixed to the swaying platform slider on the platform, the swaying platform slider can smoothly slide along the swaying platform guide rail on the platform extension arm. Therefore, the linear rising and falling motion of the chain can be stably converted into the swaying motion of the platform around its axis through this transmission structure.

[0028] The specific transmission process is precisely matched with the forward and reverse rotation of the motor: When the motor rotates forward and drives the chain to rise, the chain drives the chain connector to move upward synchronously. The chain connector pushes the swing table slider connector through the pin, which in turn drives the swing table slider to slide upward along the swing table guide rail. Finally, it pushes the table surface to swing to one side around the cylindrical roller bearing assembly to the maximum forward value of the preset roll angle. When the motor rotates in reverse and drives the chain to descend, the chain drives the chain connector to move downward synchronously. Through the same transmission path, it drives the swing table slider to slide downward along the swing table guide rail, which in turn pulls the table surface to swing in the opposite direction around the cylindrical roller bearing assembly to the maximum reverse value of the preset roll angle.

[0029] During this process, the sliding cooperation between the pendulum guide rail and the pendulum slider can eliminate lateral movement, and the pin rotation structure between the chain connector and the pendulum slider connector can avoid motion interference. At the same time, the chain slider and the chain connector are fixedly connected and slide synchronously along the chain guide rail of the sprocket support frame, effectively limiting the lateral deviation of the chain. Together, they ensure that the transition from chain lifting to pendulum swing is smooth and without jamming, and the transmission is precise, providing a reliable guarantee for the realization of single rotational degree of freedom swing test.

[0030] (4) Continuous operation and stable control stage Under the control cabinet, the motor continuously reverses direction, driving the chain to rise and fall in a cycle, causing the platform to swing back and forth between the maximum positive and negative swing angles at a preset roll cycle, thus realizing the continuous simulation of the ship's roll motion.

[0031] During operation, the baffles at the ends of the swing platform guide rails prevent the swing platform slider from sliding over its travel and avoid damage from component collisions. The reinforcing ribs (swing platform reinforcing ribs and support leg reinforcing ribs) and rigid structure design of the platform module, combined with the smooth rotation characteristics of the cylindrical roller bearing assembly, can distribute the platform load, improve structural stability, and ensure that the platform does not tilt or jam under a maximum load of 500kg, meeting the requirements for continuous operation of more than 3000 hours and adapting to long-term test scenarios such as durability testing.

[0032] (5) Operation stop and parameter adjustment stage When the experiment ends or the simulated sea state needs to be changed, a stop command is issued via the control cabinet. The motor stops running, the chain stops lifting, and the platform returns to its initial horizontal position under gravity. If the roll parameters need to be adjusted, the parameter preset stage can be repeated, the target value can be reset, and the equipment can be restarted to switch to the new roll simulation state.

[0033] The entire operation process achieves precise control of the roll angle and period through the synergistic effect of the mechanical structure and the electronic control system. It is stable in transmission and easy to operate, which fully meets the technical requirements of ship-related tests for roll simulation.

[0034] Beneficial effects: (1) Optimize transmission layout to reduce costs and adapt to scenario requirements in an economical way. To address the practical needs of most operating conditions where roll-type rotational motion is dominant and some tests do not require high-precision simulation of six degrees of freedom, a side-chain drive is adopted to replace the traditional center drive. This distributes the test load torque to the platform, support legs, and cylindrical roller bearing assembly, significantly reducing the motor load and eliminating the need for a special high-torque motor. Combined with a square tube frame, standard bearings, and other general-purpose components and a modular design, the high cost of a six-degree-of-freedom platform is avoided, reducing the procurement and maintenance costs of core components.

[0035] (2) Improved efficiency in switching electrical control parameters and convenient operation adapted to test characteristics The control cabinet program enables electronic switching of roll angles of ±5° / ±10° / ±20° / ±40° and roll cycles of 10s / 20s / 30s. This eliminates the need for mechanical disassembly and assembly, allowing for rapid switching and a high degree of automation. It shortens test preparation time, reduces human error, and significantly improves the efficiency of the test process.

[0036] (3) Structural reinforcement and load stabilization, durability matching test scenario The table structure is optimized with "square tube frame + thick cold-rolled steel plate + multiple reinforcing ribs". Combined with the torque distribution design of cylindrical roller bearing assembly, it can achieve a maximum load of 500kg and can be adapted to test loads such as chemical containers and ship parts. The transmission system eliminates motion interference through the design of guide rail slider anti-slip and bushing limit meshing, ensuring that the equipment can run continuously and stably for more than 3,000 hours without tilting or jamming.

[0037] (4) Adaptable to multiple swing types, accurately reproducing test conditions Based on the requirement that roll is the dominant force in most operating conditions and pitch / bow simulation is needed in some tests, the installation angle of the upper test system can be adjusted to flexibly realize the simulation of three types of rolling: roll, pitch, and bow. With multiple angle and cycle combinations, the rolling state under different sea conditions can be accurately reproduced. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention.

[0039] Figure 2 This is a schematic diagram of the slider of the swing table according to the present invention.

[0040] Figure 3 This is a schematic diagram of the chain connector of the present invention.

[0041] Figure 4 This is a schematic diagram of the chain slider of the present invention.

[0042] Figure 5 This is a schematic diagram of the slider connector of the swing table according to the present invention.

[0043] Reference numerals: Base-1, Base support plate-101, Tabletop-2, Tabletop extension arm-201, Tabletop reinforcing rib-202, Tabletop guide rail-203, Baffle-204, Support leg-3, Support leg reinforcing rib-301, Tabletop connecting block-4, Cylindrical roller bearing assembly-5, Sprocket support frame-6, Support channel steel-601, Connecting cover plate-602, Sprocket-7, Gear-701, Chain-8, Bushing-9, Chain guide rail-10, Chain slider-11, Chain connector-12, Tabletop slider connector-13, Tabletop slider-14, Motor and reducer-15, Control cabinet-16, Connecting bolt-17 Detailed Implementation

[0044] The non-standard rocking platform for ships with distributed load-bearing chain drive disclosed in this invention achieves low cost, easy operation, high load-bearing capacity, long-term stability, and multi-adaptability roll simulation function through modular structural design and chain transmission control. The following is a detailed description of the specific parameters, assembly, and operation process.

[0045] I. Core Parameter Settings In this embodiment, the core parameters of the equipment are strictly matched to the test requirements, and the specific settings are as follows: Load capacity: Designed for a maximum of 500kg, compatible with a 300kg test bench and corresponding load, with a bench size of 0.8m×0.8m and a vertical distance of 0.45m from the center of gravity of the bench to the bench surface; Roll angle: Four adjustable settings are provided, namely ±5°, ±10°, ±20° and ±40°, to cover the simulation needs of different sea conditions from calm to severe. Roll period: Three adjustable levels are set, namely 10s, 20s and 30s, which are in line with the actual roll period characteristics of the ship. Continuous operation capability: Supports more than 3,000 hours of uninterrupted stable operation, meeting the requirements of durability testing; Core component parameters: The motor is a Delta servo 1.5KW motor with a rated speed of 2000r / min and a rated torque of 7.16NM, paired with a reducer with a speed ratio of 30 and a rated torque of 350NM; the sprocket has an inner diameter of 30mm and a radius of 50mm; the cylindrical roller bearing is GB / T283-94 specification NH206E with a bore diameter of 30mm and a matching 30mm bearing shaft.

[0046] II. Component Assembly and Connection (a) Base The base is constructed using square tubing welded to form a rigid frame, ensuring overall load-bearing stability. A base support plate is fixedly welded to the upper part of one side of the base. This support plate serves as a unified installation reference surface, and the control cabinet 16, sprocket support frame 6, and motor 15 base are fixedly installed using bolts and fasteners. During assembly, the coaxiality and positional accuracy of each installation surface are strictly guaranteed, with deviations controlled within ±0.5mm to avoid transmission jamming or uneven structural stress.

[0047] (ii) Assembly of tabletop modules Tabletop 2 fabrication: The tabletop is constructed with an 80×80 square tube as the load-bearing frame, welded to a 6mm thick cold-rolled steel plate. An extension arm 201 is integrally extended on one side of the tabletop, and a tabletop reinforcing rib 202 is welded at the connection point to enhance the structure's resistance to fatigue deformation. A swing table guide rail 203 is laid parallel on the upper and lower sides of the tabletop extension arm 201, and a baffle 204 is welded to the end of the swing table guide rail 203 to limit the overtravel of the swing table slider 14.

[0048] Installation of support leg 3: A rectangular hollow steel section of 120×80×3 is selected as support leg 3. Support leg reinforcing rib 301 is welded at the connection between support leg 3 and base 1 to improve the overturning resistance. The bottom of support leg 3 is rigidly connected to base 1 by bolts, and the bolt pre-tightening torque meets the design requirements.

[0049] Rotating structure assembly: One end of the table connecting block 4 is welded and fixed to the bottom of the table 2, and the other end is rotatably connected to the support leg 3 through the cylindrical roller bearing assembly 5. A 30mm mounting hole is reserved at the corresponding position of the two, and the GB / T283-94 specification NH206E cylindrical roller bearing assembly 5 is inserted into it to ensure that the table 2 swings around the support leg 3 smoothly without jamming.

[0050] Slider and connecting parts assembly: The slider 14 of the swing table adopts a dovetail cross-section structure (such as... Figure 2 There are two of them, which are slidably engaged with the upper and lower sides of the table extension arm 201 and the table guide rail 203 respectively. The sliding gap is controlled between 0.1-0.3mm. The table slider 14 is fixedly connected to the door frame structure table slider connector 13 by countersunk bolts. The bolts are M8 specification. After tightening, it is ensured that the two move synchronously without relative displacement.

[0051] (III) Chain-type drive module Sprocket support frame 6 installation: A rigid frame is formed by welding the left and right side support channel steels 601 to the upper and lower side connecting cover plates 602, and is fixedly connected to the base support plate 101 by bolts and fasteners; a chain guide rail 10 is fixedly installed parallel to the outer side of the right side support channel steel 601. The length of the chain guide rail 10 matches the lifting stroke of the chain 8, and the cross-section is dovetail-shaped, and it is connected to the chain slider 11 (e.g. Figure 4 This forms a combination to prevent hair loss.

[0052] Assembly of sprocket 7 and chain 8: Bushings 9 are inserted through the pre-drilled mounting holes on the upper and lower parts of the support channel steel 601 on both sides of the sprocket support frame 6. The two sprockets 7 with gears 701 are respectively limited and installed between the left and right support channel steels 601 to ensure that the sprockets can rotate freely and the lateral offset does not exceed 0.3mm. The chain 8 is meshed with the gears 701 of the two sprockets for transmission. The lower sprocket is connected to the output end of the motor and reducer 15 as the driving wheel, and the upper sprocket is used as the driven wheel to guide and tension.

[0053] Chain slider and connector assembly: The inner side of the chain slider 11 is provided with a groove that matches the chain guide rail 10, and slides with the chain guide rail; the chain slider 11 and the outward arm structure of the chain connector 12 are fixedly connected by bolts; the door frame structure of the chain connector 12 is rotatably connected to the swing table slider connector 13 by a pin, and is connected to the connecting bolt 17 fixed at one end on the chain link by bolt fasteners, so as to realize the synchronous lifting of the chain 8 and the chain slider 11.

[0054] (iv) Control module assembly The Delta servo 1.5KW motor and the reducer with a speed ratio of 30 are assembled into a motor and reducer 15, which is fixedly installed on the motor base. The motor output shaft and the lower sprocket are connected by a coupling to ensure the coaxiality of the transmission. The control cabinet 16 is fixedly installed on the base support plate and is electrically connected to the motor and reducer 15 through cables. It has a built-in dedicated control program that can set the roll angle of ±5°, ±10°, ±20°, and ±40° and the roll cycle of 10s, 20s, and 30s. It automatically matches the motor speed and forward and reverse frequency, and has the functions of operating status monitoring and abnormal shutdown protection, which improves the safety of use and the accuracy of parameter control.

[0055] III. Equipment Operation Process (a) Parameter preset Through the operating interface of control cabinet 16, the target roll angle (selectable in four levels: ±5°, ±10°, ±20°, ±40°) and roll period (selectable in three levels: 10s, 20s, 30s) can be set according to the simulated sea conditions. The control program automatically matches the corresponding motor speed and forward / reverse frequency to ensure that the roll motion accurately matches the set parameters. Simultaneously, the non-standard ship swaying platform of this invention, with its distributed load-bearing structure, can achieve sway testing of a single rotational degree of freedom. By adjusting the installation angle of the upper testing system, the simulation requirements for roll, pitch, and bow can be met respectively, adapting to various test scenarios.

[0056] (II) Power Transmission and Motion Conversion The motor and reducer 15 are started. The motor operates in both forward and reverse directions according to the preset parameters of the control cabinet. Its output power is reduced and amplified by the reducer before being precisely transmitted to the drive sprocket at the bottom of the sprocket support frame. When the motor rotates forward, the lower drive sprocket rotates clockwise, driving the chain upward and downward through the meshing of gears and chain. When the motor rotates in reverse, the lower drive sprocket rotates counterclockwise, driving the chain downward and downward. During this process, the upper driven sprocket rotates synchronously with the chain, playing a guiding and tensioning role to ensure smooth chain operation.

[0057] When the chain rises or falls, the chain connector, which is fixedly connected to the chain, moves up and down synchronously, driving the swing table slider connector to move via a pin. Since the swing table slider connector is fixed to the swing table slider, and the swing table slider slides along the swing table guide rail of the table extension arm, the linear rising and falling motion of the chain is smoothly converted into the oscillating motion of the table around the cylindrical roller bearing assembly. When the chain rises, it pushes the table to swing forward to the preset maximum angle; when the chain falls, it pulls the table to swing in the opposite direction to the preset maximum angle.

[0058] (III) Stable Operation Control Under the control of the control cabinet 16, the motor continuously reverses direction, driving the chain 8 to cyclically rise and fall, causing the platform to oscillate back and forth between the maximum positive and negative swing angles at a preset roll cycle, thus realizing continuous simulation of the ship's roll motion. During operation, the chain slider 11 slides synchronously along the chain guide rail 10, limiting the lateral deviation of the chain and ensuring transmission accuracy; the reinforcing rib structure and rigid design of the platform module, combined with the smooth rotation of the cylindrical roller bearing assembly, ensure that the platform does not tilt or jam under a maximum load of 500kg; the baffle 204 effectively prevents the platform slider 14 from overtraveling and avoids damage from component collisions.

[0059] (iv) Shutdown and parameter adjustment When the experiment ends or the simulated sea state needs to be changed, a stop command is issued through the control cabinet. The motor stops running, the chain stops lifting, and the platform returns to its initial horizontal position under gravity. If it is necessary to adjust the roll parameters or switch the swing type, the parameter preset steps can be repeated, the target value can be reset, or the installation angle of the upper test system can be adjusted before starting the equipment to switch to the new simulation state. No mechanical disassembly or assembly is required, making the operation convenient and efficient.

[0060] This implementation method, through precise parameter setting, standardized assembly process and coordinated transmission design, ensures that the equipment achieves comprehensive performance of "low cost, easy operation, high load capacity, long-term stability and multiple adaptability", fully meeting the test requirements of performance testing of ship-related components and reliability verification of marine equipment.

Claims

1. A chain-driven non-standard swaying platform for ships with distributed load-bearing characteristics, characterized in that, The system adopts a modular design, consisting of four parts: a base, a platform module, a chain-driven module, and a control module. Each module is structurally independent yet coordinated in transmission. The base is a rigid frame welded from square tubing, with a base support plate fixed to the upper part of one side, providing a unified mounting reference surface for the control cabinet, sprocket support frame, and motor base. The platform module includes a platform, support legs, platform connecting blocks, a swing table guide rail, a swing table slider, and a swing table slider connector, bearing the test load and executing the lateral movement. The chain-driven module includes a sprocket support frame, chain, sprocket, bushing, chain guide rail, chain slider, and chain. The connecting component enables the motion conversion from "motor power → chain lifting → platform swing"; the control module includes a motor and reducer, and a control cabinet, enabling the adjustment of roll parameters and control of equipment operation; the equipment has a maximum load capacity of 500kg, supports roll angles of ±5°, ±10°, ±20°, and ±40° and roll cycles of 10s, 20s, and 30s, and can operate continuously and stably for more than 3000 hours; the chain drive module is located on one side of the platform, and the chain lifting motion distributes the test load torque to the support legs and cylindrical roller bearing assembly of the platform module to reduce the motor load.

2. The swing table according to claim 1, characterized in that, The tabletop uses square tubing as its load-bearing frame, welded to thick cold-rolled steel plates. An extension arm extends integrally from one side of the tabletop, with reinforcing ribs at the connection point. A swing table guide rail is laid parallel to each of the upper and lower sides of the extension arm, with baffles fixed at the ends of the guide rails. The support legs are rectangular hollow steel sections, with reinforcing ribs at the connection point between the support legs and the base. The bottom of the support legs is rigidly connected to the base via bolts.

3. The swing table according to claim 1, characterized in that, One end of the tabletop connecting block is fixedly connected to the bottom of the tabletop, and the other end is rotatably connected to the support leg via a cylindrical roller bearing assembly. The tabletop connecting block and the support leg have pre-drilled matching mounting holes, through which the cylindrical roller bearing assembly passes. There are two swing table sliders, with T-shaped or dovetail-shaped cross-sections, which slide in cooperation with the upper and lower swing table guide rails of the tabletop extension arm, respectively. Each swing table slider is provided with four countersunk bolt holes. The swing table slider connector is a portal frame structure, with bolt through holes matching the countersunk bolt holes of the swing table slider on its upper and lower sides. It is rigidly connected to the swing table slider by bolts. A pin through hole matching the chain connector is provided in the center of the side of the swing table slider connector. The two are rotatably connected by a pin.

4. The swing table according to claim 1, characterized in that, The sprocket support frame is a rigid frame welded from left and right support channel steels and upper and lower connecting cover plates, and fixed to the base support plate by bolts. A chain guide rail is parallel to the outer side of the right support channel steel, and the support channel steel has pre-drilled sprocket mounting holes. There are two sprockets, respectively mounted on the upper and lower parts of the sprocket support frame. Each sprocket has a gear that meshes with the chain for transmission. The lower sprocket is the driving sprocket, and the upper sprocket is the driven sprocket. A bushing passes through and is fixed to the sprocket mounting holes in the support channel steel, limiting the sprocket's position on the left and right supports. Between the support channel steels; the length of the chain guide rail is consistent with the chain lifting stroke, and the cross-section is T-shaped or dovetail-shaped, which is matched with the chain slider to prevent slippage; the inner side of the chain slider is provided with a groove that matches the chain guide rail, and four countersunk bolt holes are provided, which are fixed to the chain connector by bolts; the chain connector is a "door frame structure + outward arm structure", the door frame structure is rotatably connected to the swing table slider connector by a pin, and is connected to the connecting bolts fixed on the chain link by bolts, and the outward arm structure is fixed to the chain slider.

5. The swing table according to claim 1, characterized in that, The motor and reducer are described as follows: the motor is a Delta servo 1.5KW motor with a rated speed of 2000r / min and a rated torque of 7.16NM; the reducer has a speed ratio of 30 and a rated torque of 350NM; the motor output power is transmitted to the lower sprocket after being reduced and amplified by the reducer; the control cabinet has a built-in control program that can set the roll angle of ±5°, ±10°, ±20°, and ±40° and the roll cycle of 10s, 20s, and 30s, automatically matching the motor speed and forward / reverse frequency, and has operation status monitoring and abnormal shutdown protection functions.

6. The swing table according to claim 1, characterized in that, Lateral movement is eliminated by the cooperation of the swing table guide rail and the swing table slider, and chain deviation is limited by the anti-disengagement cooperation of the chain guide rail and the chain slider, thus ensuring stable transmission.

7. The swing table according to any one of claims 1-6, characterized in that, The gyroscope can be used to simulate roll, pitch, or yaw motions by adjusting the angle of the test system mounted on the platform.

8. A method for simulating ship rolling using a rocking platform as described in any one of claims 1-6, characterized in that, Includes the following steps: Parameter preset steps: Set the swing angle and swing period through the control cabinet; Drive and transmission steps: Start the motor, and the power is transmitted to the drive sprocket through the reducer, driving the chain to move up and down; Motion conversion steps: The linear lifting motion of the chain is converted into the oscillating motion of the table surface around the cylindrical roller bearing assembly on the support leg through the transmission of the chain connector, the swing table slider connector and the swing table slider, thereby realizing the horizontal rocking of the table surface; In this process, by adjusting the angle of the test system mounted on the platform, the rolling motion is made to correspond to the simulation of the ship's roll, pitch, or bow motion.

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