A springboard slide system and method of use

Abstract

This invention relates to a ramp system, specifically in the field of marine technology. The system includes a ramp, one end of which is connected to the stern deck of a roll-on / roll-off (Ro-Ro) hull via a hinge mechanism. The other end of the ramp is near the stern door. A portion of the ramp near the hinge mechanism is located at the top of the stern of the Ro-Ro hull. The top surface of the stern of the Ro-Ro hull is inclined relative to the bottom surface of the ramp, creating an angle between the bottom surface of the ramp and the top surface of the stern near the hinge mechanism. Symmetrical downward-swinging actuators are arranged along the axis on both sides of the top surface near the ramp. One end of each actuator is located on the top surface of the ramp, and the other end is connected to the Ro-Ro hull. Multiple conventional power wheel sets are arranged in rows on the top surface of the ramp, with two rows of conventional power wheel sets symmetrically arranged along the axis of the ramp. At least one set of guide wheels is symmetrically arranged along the axis of the ramp, located on the side of the conventional power wheel sets near the stern door.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a ramp system and its usage. Background Technology

[0002] Traditional deployment and retrieval methods for workboats primarily rely on sling-down or fixed stern ramps. Sling-down systems suffer from severe equipment swaying in rough seas, posing a high risk of collision and poor operational safety. While existing fixed stern ramp systems partially address the sling-down issue, they still have several inherent drawbacks: limited retrieval power (relying solely on deck winches, restricting system capacity, and the steel cables are prone to swaying and detachment in complex sea conditions, posing safety hazards); poor adaptability (fixed ramp structure, only suitable for workboats with specific hull profiles, unable to effectively deploy and retrieval equipment of different types and hulls, resulting in low versatility); and insufficient space utilization (fixed ramps impose stringent requirements on stern space and deck height, and workboats are typically not allowed to park on sloping ramps, leading to wasted valuable stern space). Therefore, there is an urgent need in this field for a new, safe, and efficient deployment and retrieval system that overcomes these shortcomings. Summary of the Invention

[0003] To address the above problems, a springboard slide system and its usage method are proposed.

[0004] The technical solution of the present invention is as follows: a ramp slide system, including a ramp slide, one end of which is connected to the stern deck of a roll-on / roll-off hull via a hinge mechanism, and the other end of which is near the stern door. A portion of the ramp slide near the hinge mechanism is located at the top of the stern of the roll-on / roll-off hull. The top surface of the stern of the roll-on / roll-off hull is inclined relative to the bottom surface of the ramp slide, so that the bottom surface of the ramp slide and the top surface of the stern of the roll-on / roll-off hull form a certain angle near the hinge mechanism. A downward swing actuator is symmetrically arranged along the axis on both sides of the top surface near the ramp slide. One end of the downward swing actuator is located on the top surface of the ramp slide, and the other end of the downward swing actuator is connected to the roll-on / roll-off hull. A plurality of conventional power wheel sets are arranged in rows on the top surface of the ramp slide. Two rows of conventional power wheel sets are symmetrically arranged along the axis of the ramp slide. At least one set of guide wheel sets is symmetrically arranged along the axis of the ramp slide, and the guide wheel sets are located on the side of the conventional power wheel sets near the stern door.

[0005] Preferably, the bottom of the ramp slide extends downward to form the bottom of the ramp slide, and the shape of the bottom of the ramp slide conforms to the bottom shape of the part near the ro-ro hull, forming a smooth and continuous curved surface.

[0006] Preferably, the top of the ramp slide is provided with a sealing gasket around its perimeter, and the sealing gasket has a highly elastic structure.

[0007] Preferably, the top surface of the bottom of the ramp slide near the stern gate is sunken to form a sunken watertight top plate, and the sunken watertight top plate forms a clearance space with the two side walls of the bottom of the ramp slide.

[0008] Preferably, the conventional power wheel set further includes a housing, inside which a power component is installed. The output end of the power component is connected to a set of transmission wheels via a transmission device. Each set of transmission wheels is symmetrically arranged on both sides of the housing. The bottom of the conventional power wheel set is connected to the ramp slide via a first base.

[0009] Preferably, the conventional power wheel set includes a torsion spring assembly, the torsion spring assembly includes a connecting shaft, the connecting shaft passes through the housing, the two ends of the connecting shaft are provided with end caps, the end caps are provided with torsion springs inside, a bearing seat is rotatably sleeved on the connecting shaft between the end caps and the housing, the bearing seat is set on a first base, one end of the fixed end of the torsion spring is connected to the outside of the bearing seat, and the other end of the fixed end of the torsion spring is connected to the end of the connecting shaft.

[0010] Preferably, the guide wheel assembly further includes a frame, the bottom of which is connected to a second base via a support seat. The second base is mounted on the ramp slide, and connecting shafts are provided parallel to each other near both ends of the frame. The connecting shafts are tactilely connected to the guide rollers. The axial direction of the guide rollers is perpendicular to the axial direction of the workboat.

[0011] Preferably, multiple anti-collision posts are provided on the top surface near both sides of the ramp slide, and the anti-collision posts are located on both sides of the lower swing actuator.

[0012] Preferably, the top surface near both sides of the ramp slide is provided with a plurality of pin holes, which are symmetrically arranged along the axis of the ramp slide. The roll-on / roll-off hull is provided with pins at the positions corresponding to the pin holes. When the ramp slide is in a horizontal position, the pins of the roll-on / roll-off hull are engaged with the pin holes.

[0013] A method for using a springboard slide system includes the following steps: Recovery process: Open the stern door, pull out the pins on the roll-on / roll-off hull from the corresponding pin holes, activate the swing actuator, and lower the ramp slide to a position at a certain angle to the horizontal. As the workboat approaches the ro-ro ship, its bow, guided by the crash barriers and protected by the clearance space, passes the guide wheel assembly and contacts the conventional power wheel assembly. The conventional power wheel assembly starts, and the guide wheel assembly and each wheel assembly of the conventional power wheel assembly adaptively fit against the bottom of the workboat, maintaining a certain angle with the horizontal. The friction of the conventional power wheel assembly pulls the workboat onto the slipway until it is fully inside the ro-ro ship. The lowering actuator raises the ramp slide to a horizontal position, the stern door closes, and the watertight seal of the ramp slide is achieved through the sealing gasket; The pin is inserted into the hole to lock, the lower swing actuator releases pressure, and the recovery is completed; Lowering process: Open the stern door, pull the pins on the roll-on / roll-off hull out of the corresponding pin holes, activate the swing actuator, and lower the ramp slide to a position at a certain angle to the horizontal. When the conventional power wheel set is started, the guide wheel set and the conventional power wheel set rotate synchronously and controllably towards the stern. The friction generated between the wheel set and the bottom of the workboat becomes a controllable braking force, causing the workboat to slide into the water. Throughout the lowering process, the operator controls the lowering speed by adjusting the wheel set rotation speed. Once the workboat is completely afloat and has lost contact with the guide wheel set, it can be driven away. The guide wheel assembly and conventional power wheel assembly system stop working, and the control swing actuator restores the ramp slide to the horizontal closed state. The stern door closes, and the watertight seal of the ramp slide is achieved through the sealing gasket. Insert the pin into the hole to lock it in place, and the lowering actuator releases pressure, completing the lowering process.

[0014] The beneficial effects of this invention are as follows: This invention achieves active, flexible, and controllable deployment and retrieval through a power wheel assembly, significantly improving operational safety and success rate, and enabling operation in sea state 7; the adaptive wheel assembly allows the same system to deploy and retrieval workboats with different bottom shapes; the system is insensitive to the movement and stopping of roll-on / roll-off vessels; the conformal design of the bottom reduces navigation resistance; when the ramp is closed horizontally, it can serve as a parking platform, making full use of valuable stern space; the design of anti-collision pillars, guide wheel assemblies, and concave top plate forms multiple layers of protection, effectively avoiding the risk of collision during the recovery process. Attached Figure Description

[0015] Figure 1 This is a top view of the springboard slide system of the present invention; Figure 2 for Figure 1 Cross-sectional view of AA under medium horizontal conditions; Figure 3 for Figure 1 Cross-sectional view of AA under inclined state; Figure 4 for Figure 1 Cross-sectional view of BB in the middle; Figure 5 for Figure 1 Cross-sectional view of CC in the middle; Figure 6 This is a schematic diagram of the structure of the conventional power wheel assembly of the present invention; Figure 7 for Figure 1 Cross-sectional view of DD in the middle; Figure 8 This is a front view of the guide wheel assembly of the present invention; Figure 9 for Figure 1 Cross-sectional view of the EE; Figure 10 for Figure 1 Cross-sectional view of FF.

[0016] The component names corresponding to the various reference numerals in the diagram are as follows: 1. Jump ramp; 11. Bottom of jump ramp; 111. Submerged watertight top plate; 112. Clearance space; 12. Sealing gasket; 2. Hinge mechanism; 3. Ro-Ro hull; 31. Stern door; 32. Stern of Ro-Ro hull; 4. Swing actuator; 5. Conventional power wheel assembly; 51. First base; 52. Box; 53. Transmission device; 54. Transmission wheel; 55. Torsion spring assembly; 551. Torsion spring; 552. Bearing seat; 553. Connecting shaft; 554. End cap; 6. Guide wheel assembly; 61. Second base; 62. Frame; 63. Guide roller; 64. Connecting shaft; 65. Support seat; 7. Anti-collision post; 8. Pin hole; 9. Workboat. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0018] refer to Figure 1 , 2 As shown in Figure 3, this application discloses a ramp slide system, including a ramp slide 1, which is the main structure of the system. One end of the ramp slide 1 is connected to the stern deck of the roll-on / roll-off hull 3 via a hinge mechanism 2. The other end of the ramp slide 1 is near the stern door 31. A portion of the ramp slide 1 near the hinge mechanism 2 is located on the top of the stern 32 of the roll-on / roll-off hull. The top surface of the stern 32 of the roll-on / roll-off hull is inclined relative to the bottom surface of the ramp slide 1, so that the bottom surface of the ramp slide 1 and the top surface of the stern 32 of the roll-on / roll-off hull form a certain angle near the hinge mechanism 2. The two sides of the top surface near the ramp slide 1 are symmetrically provided with a lowering actuator 4 along the axis. The lowering actuator 4 can be a hydraulic cylinder. One end of the lowering actuator 4 is located on the top surface of the ramp slide 1, and the other end of the lowering actuator 4 is connected to the roll-on / roll-off hull 3 to control its rotation around the hinge axis, thereby realizing lowering (working state) and lifting (closed state).

[0019] The bottom of the ramp 1 extends downward to form the ramp bottom 11. The ramp bottom 11 is precisely designed so that its shape conforms to the bottom shape of the section near the roll-on / roll-off hull 3, forming a smooth and continuous curved surface, thus preventing additional resistance during navigation.

[0020] A sealing gasket 12 is embedded around the top of the ramp 1. The sealing gasket 12 has a highly elastic structure. When the ramp 1 is raised to the horizontal closed position, the sealing gasket 12 is tightly compressed between the ramp 1 and the side wall and stern door 31 of the roll-on / roll-off hull 3, ensuring that the loading compartment will not take in water when sailing in high sea states.

[0021] refer to Figure 1 , 2 As shown in Figure 5, the top surface of the bottom 11 of the ramp slide near the stern gate 31 sinks to form a sunken watertight top plate 111. The sunken watertight top plate 111 and the two side walls of the bottom 11 of the ramp slide form a clearance space 112. The clearance space 112 provides an additional accommodation and clearance space for the bow of the workboat 9, preventing the bottom of the bow of the workboat 9 from having a hard collision with the edge of the bottom 11 of the ramp slide.

[0022] refer to Figure 2 , 5 As shown, at least one set of guide wheels 6 is symmetrically arranged along the axis of the ramp slide 1. In this embodiment, one set of guide wheels 6 is symmetrically arranged. The guide wheels 6 are located on the side of the conventional power wheel set 5 near the stern gate 31. The bottom of the guide wheels 6 is connected to the ramp slide 1 through the second base 61.

[0023] refer to Figure 5 , 6 As shown, the guide wheel assembly 6 also includes a frame 62. The bottom of the frame 62 is connected to the second base 61 via a support seat 65. A connecting shaft 64 is provided parallel to both ends near the frame 62. The connecting shaft 64 is tactilely connected to the guide roller 63. The axial direction of the guide roller 63 is perpendicular to the axial direction of the workboat 9.

[0024] The guide roller 63 has a wider surface area to provide a more stable clamping force in the initial stage and prevent the workboat from slipping. Its hub axis is different from that of conventional wheelsets and is set to be perpendicular to the forward direction of the workboat 9. This avoids the protruding hub axle head from colliding with the side of the workboat 9.

[0025] A torsion spring is provided between the guide roller 63 and the second base 61. The guide roller 63 can rotate along the axis of the workboat 9 within the range of 0 to 45 degrees according to the force state, for the support and guidance of the workboat 9.

[0026] refer to Figure 4 , 5 As shown, multiple anti-collision posts 7 are provided on the top surface near both sides of the ramp slide 1. The anti-collision posts 7 are located on both sides of the swing actuator 4. The anti-collision posts 7 are used to physically prevent the workboat 9 from directly colliding with the tail of the roll-on / roll-off hull 3 during the recovery process.

[0027] refer to Figure 2 , 7As shown, the top surface of the ramp 1 is provided with a plurality of conventional power wheel sets 5 arranged in rows. The two rows of conventional power wheel sets 5 are symmetrically arranged along the axis of the ramp 1. In this embodiment, each row is provided with five conventional power wheel sets 5. The bottom of the conventional power wheel sets 5 is connected to the ramp 1 through the first base 51.

[0028] refer to Figure 7 , 8 As shown, the conventional power wheel set 5 also includes a housing 52, which contains a power component, which can be a hydraulic press. The output end of the power component is connected to a set of transmission wheels 54 through a transmission device 53. Each set of transmission wheels 54 is symmetrically arranged on both sides of the housing 52.

[0029] The conventional power wheel set 5 also includes a torsion spring assembly 55, which includes a connecting shaft 553. The connecting shaft 553 passes through the housing 52. Both ends of the connecting shaft 553 are provided with end caps 554. The end caps 554 are provided with torsion springs 551 inside. A bearing seat 552 is rotatably sleeved on the connecting shaft 553 between the end caps 554 and the housing 52. The bearing seat 552 is set on the first base 51. One end of the fixed end of the torsion spring 551 is connected to the outside of the bearing seat 552 by bolts, and the other end of the fixed end of the torsion spring 551 is connected to the end of the connecting shaft 553 by bolts.

[0030] Each set of drive wheels 54 has an adaptive function. The torsion spring assembly 55 in the conventional power wheel set 5 allows the conventional power wheel set 5 to rotate at a certain angle, thereby automatically conforming to the bottom of the workboat 6 with different line shapes, providing the best contact and traction.

[0031] refer to Figure 4 , 9 As shown in Figure 10, multiple pin holes 8 are provided on the top surface near both sides of the ramp slide 1. The pin holes 8 are symmetrically arranged along the axis of the ramp slide 1. The roll-on / roll-off hull 3 is provided with pins at the corresponding positions of the pin holes 8. When the ramp slide 1 is in a horizontal position, the pins of the roll-on / roll-off hull 3 are connected with the pin holes 8. When the ramp slide 1 needs to bear weight (such as parking the workboat 9), after adjusting it to a horizontal position, the operator inserts the pins in the pin seats on the roll-on / roll-off hull 3 into these corresponding pin holes 8, forming a stable support structure together with the hinge mechanism 2, ensuring that the ramp slide 1 can safely serve as a parking platform for the workboat 9.

[0032] refer to Figure 2 , 3 As shown, a method of using a springboard slide system includes the following steps: Recovery Process: Open the stern door 31, pull the pins on the roll-on / roll-off hull 3 out of the corresponding pin holes 8, activate the lowering actuator 4, and lower the ramp slide 1 to a position at an angle of -7° to the horizontal; the workboat 9 approaches the roll-on / roll-off hull 3 at a speed of 4-6 knots relative to the roll-on / roll-off hull. Under the guidance of the anti-collision post 7 and the protection of the avoidance space 112, the bow of the workboat 9 smoothly contacts and passes the guide wheel assembly 6, and contacts the conventional power wheel assembly 5. The conventional power wheel assembly 5 starts, and the guide wheel assembly 6 and the various wheel assemblies of the conventional power wheel assembly 5... Adaptively conforming to the bottom of the workboat 9, maintaining a 28° angle with the horizontal, the workboat is smoothly and continuously pulled to the slide by the friction of the conventional power wheel set 5 until it is fully entered into the roll-on / roll-off ship; then, the lowering actuator 4 raises the ramp slide 1 to the horizontal, the stern door 31 closes, and the watertight seal of the ramp slide 1 is achieved by the sealing gasket 12; the pin is inserted into the pin hole 8 to lock, the lowering actuator 4 depressurizes, and the recovery is completed; the whole process does not require the workboat to sprint at high speed or manual hooking, making it safe and efficient.

[0033] Lowering process: Open the stern door 31, pull the pin on the roll-on / roll-off hull 3 out of the corresponding pin hole 8, activate the lowering actuator 4, and lower the ramp slide 1 to a position at an angle of -7° to the horizontal; the conventional power wheel set 5 starts, and the guide wheel set 6 rotates synchronously and controllably towards the stern with the conventional power wheel set 5. The friction generated between the wheel set and the bottom of the workboat 9 becomes a controllable braking force, allowing the workboat 9 to slowly slide into the water at a constant and safe speed, rather than relying on gravity to accelerate its fall. Throughout the lowering process, the operator can precisely control the lowering speed by adjusting the wheel set speed; once the workboat 9 is completely afloat and has lost contact with the guide wheel set 6, it can be driven away; the guide wheel set 6 and the conventional power wheel set 5 system stop working, and the lowering actuator 4 is controlled to restore the ramp slide 1 to the horizontal closed state, the stern door 31 closes, and the watertight seal of the ramp slide 1 is achieved through the sealing gasket 12. Insert the pin into the pin hole 8 to lock it in place, and release the pressure from the lowering actuator 4 to complete the lowering process.

[0034] The beneficial effects are: This invention achieves active, flexible, and controllable deployment and retrieval through a power wheel assembly, significantly improving operational safety and success rate, and enabling operation in sea state 7. The adaptive wheel assembly allows the same system to deploy and retrieval workboats with different hull shapes. The system is insensitive to the movement and stopping of roll-on / roll-off vessels. The conformal design of the bottom reduces navigation resistance. When the ramp is closed horizontally, it can serve as a parking platform, making full use of valuable stern space. The design of anti-collision pillars, guide wheel assemblies, and concave top plate forms multiple layers of protection, effectively avoiding the risk of collisions during the recovery process.

[0035] It should be noted that the terms "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. "A plurality of" means two or more. "Installed," "connected," and "joined" should be interpreted broadly; for example, it can refer to a fixed connection, a detachable connection, or an integral connection.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A springboard slide system, characterized in that, Includes a ramp (1), one end of which is connected to the stern deck of the roll-on / roll-off hull (3) via a hinge mechanism (2). The other end of the ramp (1) is near the stern door (31). A portion of the ramp (1) near the hinge mechanism (2) is located at the top of the stern (32) of the roll-on / roll-off hull. The top surface of the stern (32) of the roll-on / roll-off hull is inclined relative to the bottom surface of the ramp (1), so that the bottom surface of the ramp (1) and the top surface of the stern (32) of the roll-on / roll-off hull form a certain angle near the hinge mechanism (2). 1) The top surfaces on both sides are symmetrically provided with a swing actuator (4) along the axis. One end of the swing actuator (4) is located on the top surface of the ramp slide (1), and the other end of the swing actuator (4) is connected to the roll-on / roll-off hull (3). The top surface of the ramp slide (1) is provided with multiple conventional power wheel sets (5) in rows. The two rows of conventional power wheel sets (5) are symmetrically arranged along the axis of the ramp slide (1). At least one set of guide wheel sets (6) is symmetrically arranged along the axis of the ramp slide (1). The guide wheel sets (6) are located on the side of the conventional power wheel sets (5) near the stern gate (31).

2. The springboard slide system according to claim 1, characterized in that, The bottom of the ramp (1) extends downward to form the bottom of the ramp (11). The shape of the bottom of the ramp (11) conforms to the bottom shape of the part near the ro-ro hull (3), forming a smooth and continuous curved surface.

3. The springboard slide system according to claim 1, characterized in that, The top of the ramp slide (1) is provided with sealing gaskets (12) around its perimeter. The sealing gaskets (12) are of a highly elastic structure.

4. The springboard slide system according to claim 1, characterized in that, The top surface of the bottom (11) of the ramp slide near the stern gate (31) is lowered to form a sunken watertight top plate (111), and the sunken watertight top plate (111) forms a clearance space (112) with the side walls of the bottom (11) of the ramp slide.

5. The springboard slide system according to claim 1, characterized in that, The conventional power wheel set (5) also includes a housing (52), which contains a power component. The output end of the power component is connected to a set of transmission wheels (54) via a transmission device (53). Each set of transmission wheels (54) is symmetrically arranged on both sides of the housing (52). The bottom of the conventional power wheel set (5) is connected to the ramp slide (1) via a first base (51).

6. The springboard slide system according to claim 5, characterized in that, The conventional power wheel set (5) includes a torsion spring assembly (55), which includes a connecting shaft (553). The connecting shaft (553) passes through the housing (52). End caps (554) are provided at both ends of the connecting shaft (553). A torsion spring (551) is provided inside the end cap (554). A bearing seat (552) is rotatably sleeved on the connecting shaft (553) between the end cap (554) and the housing (52). The bearing seat (552) is set on the first base (51). One end of the fixed end of the torsion spring (551) is connected to the outside of the bearing seat (552), and the other end of the fixed end of the torsion spring (551) is connected to the end of the connecting shaft (553).

7. The springboard slide system according to claim 1, characterized in that, The guide wheel assembly (6) also includes a frame (62). The bottom of the frame (62) is connected to a second base (61) via a support seat (65). The second base (61) is set on the ramp slide (1). A connecting shaft (64) is provided parallel to both ends near the frame (62). The connecting shaft (64) is tactilely connected to the guide roller (63). The axial direction of the guide roller (63) is perpendicular to the axial direction of the workboat (9).

8. The springboard slide system according to claim 1, characterized in that, Multiple anti-collision posts (7) are provided on the top surface near both sides of the ramp slide (1), and the anti-collision posts (7) are located on both sides of the swing actuator (4).

9. The springboard slide system according to claim 1, characterized in that, The top surface near both sides of the ramp slide (1) is provided with multiple pin holes (8). The pin holes (8) are symmetrically arranged along the axis of the ramp slide (1). The roll-on / roll-off hull (3) is provided with pins at the corresponding positions of the pin holes (8). When the ramp slide (1) is in a horizontal position, the pins of the roll-on / roll-off hull (3) are connected with the pin holes (8).

10. A method of using a springboard slide system as described in any one of claims 1-9, characterized in that, The method of use includes a recycling process and a distribution process, and the steps are as follows: Recovery process: Open the stern door (31), pull out the pin on the roll-on / roll-off hull (3) from the corresponding pin hole (8), activate the swing actuator (4), and lower the ramp slide (1) to a position at a certain angle to the horizontal. The workboat (9) approaches the ro-ro hull (3). Under the guidance of the anti-collision pillar (7) and the protection of the clearance space (112), the bow of the workboat (9) passes through the guide wheel assembly (6) and contacts the conventional power wheel assembly (5). The conventional power wheel assembly (5) starts, and the guide wheel assembly (6) and each wheel assembly of the conventional power wheel assembly (5) adaptively fit against the bottom of the workboat (9) and maintain a certain angle with the horizontal. The friction of the conventional power wheel assembly (5) pulls the workboat onto the slide until it is completely inside the ro-ro ship. The lowering actuator (4) raises the ramp slide (1) to a horizontal position, the stern door (31) closes, and the watertight seal of the ramp slide (1) is achieved through the sealing gasket (12); Insert the pin into the pin hole (8) to lock it, and release the pressure of the lower swing actuator (4) to complete the recycling. Lowering process: Open the stern door (31), pull out the pin on the roll-on / roll-off hull (3) from the corresponding pin hole (8), activate the swing actuator (4), and lower the ramp slide (1) to a position at a certain angle to the horizontal. When the conventional power wheel set (5) starts, the guide wheel set (6) and the conventional power wheel set (5) rotate synchronously and controllably toward the stern. The friction generated between the wheel set and the bottom of the workboat (9) becomes a controllable braking force, causing the workboat (9) to slide into the water. Throughout the lowering process, the operator controls the lowering speed by adjusting the rotation speed of the wheel set; once the workboat (9) is completely afloat and no longer in contact with the guide wheel set (6), it can be driven away. The guide wheel assembly (6) and the conventional power wheel assembly (5) system stop working, and the control swing actuator (4) restores the ramp slide (1) to the horizontal closed state. The stern door (31) is closed, and the watertight seal of the ramp slide (1) is achieved through the sealing gasket (12). Insert the pin into the pin hole (8) to lock it, and release the pressure of the lowering actuator (4) to complete the lowering.

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