Roll-roll two-way movable ramp driven by four oil cylinders
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AVIC WEIHAI SHIPYARD
- Filing Date
- 2025-12-25
- Publication Date
- 2026-04-24
Smart Images
Figure CN121913071A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of movable ramp structure technology for passenger roll-on / roll-off ships, specifically a four-cylinder driven bidirectional movable ramp. Background Technology
[0002] As is well known, a ramp is a transitional connection device on a ship, connecting one deck to another. One end is connected to the upper deck via a hinge, while the other end uses hydraulic cylinders to pull trolleys and wire ropes, enabling the ramp to rise and fall. Functionally, ramps are divided into unidirectional and bidirectional ramps. Unidirectional ramps allow vehicles to enter and exit from only one direction, while bidirectional ramps allow entry and exit from both directions, greatly improving work efficiency. Currently, bidirectional ramps designed by various roll-on / roll-off equipment manufacturers all use hydraulic cylinders installed at the bottom of the ramp to pull trolleys. Several sets of wire ropes wound around the trolleys, guided by pulleys and fixed to the hull, form a movable pulley mechanism to lift the ramp. Classification society regulations stipulate that such load-bearing ramps are classified as lifting equipment, therefore requiring regular inspection and maintenance according to lifting equipment specifications. Lifting equipment specifications require that the wire ropes of lifting equipment be replaced every 5 years. Considering the cost of replacing the wire ropes and the cost of routine maintenance of pulleys, it is a considerable expense for the ship owner. Moreover, the wire ropes drive the bidirectional ramp to move, and the movement is affected by the different tightness of the multiple wire ropes, which can cause swaying and low stability. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a four-cylinder driven roll-on bidirectional movable ramp that is simple in structure, cost-effective, highly stable, reduces installation difficulty, and saves installation time.
[0004] The technical solution adopted by this invention to solve its technical problem is: A four-cylinder driven roll-on / roll-off bidirectional movable ramp is provided, comprising a movable ramp, an upper deck, a middle deck, and a lower deck. The middle deck on the side of the bulkhead has movable ramp movement holes, and the movable ramp is positioned at the locations of these holes. The movable ramp is characterized by four hydraulic cylinders symmetrically arranged at its front, rear, left, and right positions. The cylinder seats of the hydraulic cylinders are rotatably connected to the lower part of the upper deck, and the output ends of the hydraulic cylinders are rotatably connected to the movable ramp. Left and right limiting mechanisms and front and rear limiting mechanisms are installed between the lower part of the movable ramp and the middle deck. Lifting and fixing devices are symmetrically installed on the left and right sides of the lower part of the movable ramp. A front guide slider and a rear guide slider are connected to the side of the movable ramp closest to the bulkhead. A front guide rail and a rear guide rail are provided on the bulkhead to cooperate with the front and rear guide sliders. The movable ramp moves downwards at its front side through the cooperation of the front and rear guide sliders, and downwards at its rear side through the cooperation of the rear guide sliders. A front wing plate and a rear wing plate are connected to the front and rear sides of the movable ramp, respectively.
[0005] The movable ramp of the present invention has an annular sealing groove on the middle deck above the perimeter. The sealing strip is adhered in the sealing groove. After the movable ramp moves to the middle deck position, the stainless steel flat bar on the movable ramp contacts the sealing strip and presses the sealing strip tightly into the sealing groove, thereby realizing the separation between the compartments above the middle deck and the compartments below the middle deck, and playing the role of watertight separation and fireproof separation.
[0006] The invention relates to an external pin lug installed on the middle deck above the movable ramp, and an internal pin lug installed at the corresponding external pin lug position on the movable ramp. The external pin lug and the internal pin lug are connected by a fixing pin. The fixing pin passes through the internal pin lug of the movable ramp and the external pin lug of the middle deck to limit the movable ramp when it is fixed, thus ensuring safety.
[0007] The lifting and fixing device of the present invention includes a lifting cylinder, an upper fixed shaft, a lower fixed shaft, a lower pressure plate, an upper top plate, a bend plate, a bend upper shaft, and a bend lower shaft. The cylinder seat of the lifting cylinder is rotatably connected to the lower side of the movable ramp. The output end of the lifting cylinder is rotatably connected to one end of the bend plate. The bend of the bend plate is rotatably connected to the lower end of the upper top plate via the bend upper shaft. The upper end of the upper top plate is rotatably connected to the movable ramp via the upper fixed shaft. The other end of the bend plate is rotatably connected to the upper end of the lower pressure plate via the bend lower shaft. The lower end of the lower pressure plate is rotatably connected to the movable ramp via the lower fixed shaft. The upper part of the upper top plate is provided with a protruding lifting part. After the upper top plate rotates, the lifting part contacts the movable ramp. The upper part of the lower pressure plate is provided with a protruding pressing part. After the lower pressure plate rotates, the pressing part contacts the pressing groove provided on the middle deck of the movable ramp side. The lower pressure plate continuously rotates and presses down the pressing groove, thereby lifting the movable ramp.
[0008] The movable ramp of the present invention has a central suspension rod mechanism installed in the middle. The central suspension rod mechanism further ensures the safety of the movable ramp during operation and protects the central structure of the movable ramp from excessive bending deformation.
[0009] The intermediate boom mechanism of the present invention includes an upper boom and a lower boom. The upper boom is hinged to the middle deck, and the lower boom is hinged to the movable ramp. The upper boom and the lower boom are hinged together by an intermediate pin. When the movable ramp is in operation, the connection safety of the movable ramp is ensured by the pulling of the upper boom and the lower boom.
[0010] The left and right limiting mechanism of the present invention includes a left limiting protrusion and a right limiting protrusion. The left limiting protrusion is fixed on the bulkhead of the hull, and the right limiting protrusion is fixed on the side of the movable ramp. After the movable ramp moves up, the left limiting protrusion and the right limiting protrusion are engaged to make the movable ramp and the bulkhead have no gap, thus preventing the movable ramp from swaying left and right.
[0011] The fore-and-aft limiting mechanism of the present invention includes a fore hull limiting block, a fore ramp limiting block, an aft hull limiting block, and an aft ramp limiting block. The fore hull limiting block and the aft hull limiting block are respectively fixed to the bulkhead of the hull, and the fore ramp limiting block and the aft ramp limiting block are respectively fixed to the movable ramp. The front side of the fore ramp limiting block contacts and limits the rear side of the fore hull limiting block, and the rear side of the aft ramp limiting block contacts and limits the front side of the aft hull limiting block.
[0012] The front guide rail and the rear guide rail described in this invention have a symmetrical structure, and the shapes of the front guide rail and the rear guide rail are along the downward trajectory of the front end of the movable ramp and the downward trajectory of the rear end of the movable ramp.
[0013] The front guide rail of the present invention includes a front support plate and a front guide plate. The front support plate is fixedly connected to the bulkhead, and the front guide plate is perpendicularly connected to the front support plate. The front guide plate faces the front side of the front support plate. The front guide slider includes a front connecting plate and a front U-shaped plate. The front connecting plate is fixedly connected to the front side of the movable ramp. The closed end of the front U-shaped plate is connected to the front connecting plate, and the open end of the front U-shaped plate faces the rear side and is inserted into the front guide plate.
[0014] The rear guide rail of the present invention includes a rear support plate and a rear guide plate. The rear support plate is fixedly connected to the bulkhead, and the rear guide plate is perpendicularly connected to the rear support plate. The rear guide plate faces the rear side of the rear support plate. The rear guide slider includes a rear connecting plate and a rear U-shaped plate. The rear connecting plate is fixedly connected to the rear side of the movable ramp. The closed end of the rear U-shaped plate is connected to the rear connecting plate, and the open end of the rear U-shaped plate faces the front and is inserted into the rear guide plate.
[0015] The present invention, due to the above-mentioned structure, has the advantages of simple structure, cost saving, high stability, reduced installation difficulty, reduced installation time, and reduced maintenance costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the movable ramp with the front side lowered according to the present invention.
[0017] Figure 2 This is a schematic diagram of the structure of the movable ramp that moves downwards at the rear.
[0018] Figure 3 This is a top view of the activity ramp.
[0019] Figure 4 This is a diagram showing the connection between the ramp and the bulkhead.
[0020] Figure 5 yes Figure 4 Side view.
[0021] Figure 6 yes Figure 4 Diagram showing the connection relationship between the front guide rail and the front guide slider.
[0022] Figure 7 yes Figure 4 Diagram showing the connection relationship between the middle and rear guide rails and the rear guide slider.
[0023] Figure 8 This is a diagram showing the connection relationship between the lifting and fixing device of the present invention and the movable ramp bulkhead.
[0024] Figure 9 This is a diagram showing the connection relationship between the front and rear limiting mechanisms, the bulkhead, and the movable ramp in this invention. In this diagram, 9-1 is the connection relationship diagram between the front hull limiting block and the front ramp limiting block, and 9-2 is the connection relationship diagram between the rear hull limiting block and the rear ramp limiting block.
[0025] Figure 10 This is a diagram showing the connection relationship between the left and right limiting mechanisms, the bulkhead, and the movable ramp in this invention.
[0026] Figure 11 This is a diagram showing the sealing relationship between the movable ramp and the bulkhead in this invention.
[0027] Figure 12 These are diagrams showing the lifting and folding states of the lifting and fixing device of the present invention, wherein 12-1 is the folding state diagram and 12-2 is the lifting state diagram.
[0028] Figure 13 yes Figure 1 A partial enlarged view of the intermediate suspension mechanism. Detailed Implementation
[0029] The present invention will be further described below with reference to the accompanying drawings: As shown in the attached diagram, a four-cylinder driven roll-on / roll-off bidirectional movable ramp includes a movable ramp 1, an upper deck 2, a middle deck 3, and a lower deck 4. The middle deck 3 on the side of the bulkhead has movable ramp movement holes, and the movable ramp 1 is located at the positions of these movement holes. The movable ramp 1 is characterized by having four hydraulic cylinders 5 symmetrically arranged at its front, rear, left, and right positions. The cylinder seats of the hydraulic cylinders 5 are rotatably connected to the lower part of the upper deck 2, and the output ends of the hydraulic cylinders 5 are rotatably connected to the movable ramp 1. Left and right limiters are installed between the lower part of the movable ramp 1 and the middle deck 3. The structure includes a front and rear limiting mechanism. Lifting and fixing devices are symmetrically installed on the left and right sides below the movable ramp 1. The movable ramp 1 is connected to the front guide slider 6 and the rear guide slider 7 on the side near the bulkhead. The bulkhead 8 is provided with a front guide rail 9 and a rear guide rail 10 that cooperate with the front guide slider 6 and the rear guide slider 7. The movable ramp 1 moves downward at its front side through the cooperation of the front guide slider 6 and the rear guide slider 7. The movable ramp 1 moves downward at its rear side through the cooperation of the rear guide slider 7 and the rear guide slider 1. The front and rear sides of the movable ramp 1 are respectively connected to the front wing plate 11 and the rear wing plate 12.
[0030] Furthermore, an annular sealing groove 14 is provided on the middle deck above the perimeter of the movable ramp 1. The sealing strip 13 is adhered in the sealing groove. After the movable ramp 1 moves to the position of the middle deck 3, the stainless steel flat bar on the movable ramp contacts the sealing strip and presses the sealing strip 13 tightly into the sealing groove 14, thereby achieving the separation between the cabin above the middle deck 3 and the cabin below the middle deck 3, and playing the role of watertight separation and fireproof separation.
[0031] Furthermore, an outer pin lug is installed on the middle deck 3 above the movable ramp 1, and an inner pin lug is installed at the corresponding position of the outer pin lug on the movable ramp 1. The outer pin lug and the inner pin lug are connected by a fixing pin 15. The fixing pin 15 passes through the inner pin lug of the movable ramp 1 and the outer pin lug of the middle deck 3 to limit the movement of the movable ramp 1 when it is fixed, thus ensuring safety.
[0032] The inner pin lugs on the aforementioned movable ramp can be arranged on the left and right sides of the movable ramp, or on the front and rear sides of the movable ramp, or on both the left and right sides and the front and rear sides of the movable ramp simultaneously. The arrangement of the inner pin lugs corresponds to the arrangement of the outer pin lugs in terms of position and number, ensuring the stability of the connection between the movable ramp and the middle deck after the ramp is closed.
[0033] Furthermore, the lifting and fixing device includes a lifting cylinder 16, an upper fixing shaft 17, a lower fixing shaft 18, a lower pressure plate 19, an upper top plate 20, a bend plate 21, a bend upper shaft 22, and a bend lower shaft 23. The cylinder seat of the lifting cylinder 16 is rotatably connected to the lower side of the movable ramp 1. The output end of the lifting cylinder 16 is rotatably connected to one end of the bend plate 21. The bend of the bend plate 21 is rotatably connected to the lower end of the upper top plate 20 via the bend upper shaft 22. The upper end of the upper top plate 20 is rotatably connected to the movable ramp 1 via the upper fixing shaft 17. The other end of the bend plate 21 is connected to the lower pressure plate 19 via the bend lower shaft 23. The upper end of the plate 19 is rotatably connected, and the lower end of the lower pressure plate 19 is rotatably connected to the movable ramp 1 via the lower fixed shaft 18. The upper part of the upper top plate 20 is provided with a protruding lifting part 24. After the upper top plate 20 rotates, the lifting part 24 contacts the movable ramp 1. The upper part of the lower pressure plate 19 is provided with a protruding pressing part 25. After the lower pressure plate 19 rotates, the pressing part 25 contacts the pressing groove 26 provided on the middle deck 3 on the side of the movable ramp 1. The lower pressure plate 19 continues to rotate and presses down the pressing groove 26, thereby lifting the movable ramp 1 and fixing the ramp with the fixed pin 15.
[0034] Furthermore, a central suspension rod mechanism is installed in the middle of the movable ramp 1. The central suspension rod mechanism further ensures the safety of the movable ramp 1 during operation and protects the central structure of the movable ramp from excessive bending deformation.
[0035] Furthermore, the intermediate boom mechanism includes an upper boom 27 and a lower boom 28. The upper boom 27 is hinged to the middle deck 3, and the lower boom 28 is hinged to the movable ramp 1. The upper boom 27 and the lower boom 28 are hinged together via an intermediate pin 29. When the movable ramp 1 is lowering, the connection safety of the movable ramp 1 is ensured by the pulling of the upper boom 27 and the lower boom 28. Figure 12 Position A is for retracted loading, and position B is for unfolded loading.
[0036] Furthermore, the left and right limiting mechanism includes a left limiting protrusion 30 and a right limiting protrusion 31. The left limiting protrusion 30 is fixed to the bulkhead 8 of the hull, and the right limiting protrusion 31 is fixed to the side of the movable ramp 1. After the movable ramp 1 moves upward, the left limiting protrusion 30 and the right limiting protrusion 31 engage to make the movable ramp 1 and the bulkhead 8 without gap, thus preventing the movable ramp 1 from swaying left and right.
[0037] Furthermore, the aforementioned front and rear limiting mechanisms include a front hull limiting block 32, a front ramp limiting block 33, a rear hull limiting block 34, and a rear ramp limiting block 35. The front hull limiting block 32 and the rear hull limiting block 34 are respectively fixed to the bulkhead 8 of the hull, and the front ramp limiting block 33 and the rear ramp limiting block 35 are respectively fixed to the movable ramp 1. The front side of the front ramp limiting block 33 contacts and limits the rear side of the front hull limiting block 32, and the rear side of the rear ramp limiting block 35 contacts and limits the front side of the rear hull limiting block 34.
[0038] The contact surfaces between the aforementioned front hull limiting block 32 and the front ramp limiting block 33, and between the rear hull limiting block 34 and the rear ramp limiting block 35, are all designed as inclined surfaces to ensure the docking limiting effect.
[0039] Furthermore, the front guide rail 9 and the rear guide rail 10 are symmetrical structures, and the shapes of the front guide rail 9 and the rear guide rail 10 are along the downward trajectory of the front end of the movable ramp 1 and the downward trajectory of the rear end of the movable ramp 1.
[0040] Furthermore, the front guide rail 9 includes a front support plate 36 and a front guide plate 37. The front support plate 36 is fixedly connected to the bulkhead 8, and the front guide plate 37 is perpendicularly connected to the front support plate 36. The front guide plate 37 faces the front side of the front support plate 36. The front guide slider 6 includes a front connecting plate 38 and a front U-shaped plate 39. The front connecting plate 38 is fixedly connected to the front side of the movable ramp 1. The closed end of the front U-shaped plate 39 is connected to the front connecting plate 38, and the open end of the front U-shaped plate 39 faces the rear and is inserted into the front guide plate 37.
[0041] Furthermore, the rear guide rail 10 includes a rear support plate 40 and a rear guide plate 41. The rear support plate 40 is fixedly connected to the bulkhead 8, and the rear guide plate 41 is perpendicularly connected to the rear support plate 40. The rear guide plate 41 faces the rear side of the rear support plate 40. The rear guide slider 7 includes a rear connecting plate 42 and a rear U-shaped plate 43. The rear connecting plate 42 is fixedly connected to the rear side of the movable ramp 1. The closed end of the rear U-shaped plate 43 is connected to the rear connecting plate 42, and the open end of the rear U-shaped plate 43 faces the front and is inserted into the rear guide plate 41.
[0042] In the above scheme, after the movable ramp 1 and the middle deck 3 are closed, the front wing plate 11 and the rear wing plate 12 on the front and rear sides of the movable ramp 1 are located below the middle deck 3.
[0043] In practical implementation, this patented solution, based on the ship's technical specifications, designs a bidirectional movable ramp 1 that meets the requirements for length, width, and slope. The ramp's structural strength meets the specifications for vehicle loading and uniform load distribution on adjacent decks, as well as the relevant regulations regarding ramp structural strength. The ramp's sealing meets the ship's watertight partitioning requirements; its fireproofing meets the ship's fire-resistant zone partitioning requirements; the ramp's four hydraulic cylinders meet the requirements for load-bearing lifting force and stroke; multiple sets of hydraulic lifting and fixing devices and fixing pins 15 are designed below the movable ramp 1 for overall lifting and locking of the ramp; two symmetrical guide rails and guide slider structures are designed at the front and rear for guiding the ramp during lifting and lowering; multiple forward and backward guiding mechanisms and left and right limiting mechanisms are designed for front-to-back and left-to-right limiting of the ramp, making the installation and maintenance of the movable ramp 1 simpler, improving installation efficiency, reducing shipyard manufacturing and installation costs, and saving shipowner maintenance costs.
[0044] The process of the movable ramp 1 moving downwards and retracting is as follows: the two front hydraulic cylinders 5 drive with a long stroke, and the two rear hydraulic cylinders 5 drive with a short stroke. During this downward movement, the front U-shaped plate 39 moves along the front guide plate 37, and the rear U-shaped plate 43 disengages from the rear guide plate 41. Therefore, the rear guide rail 10 and the rear guide slider 7 do not restrict the downward movement of the front of the movable ramp 1 during the downward movement. When the front of the movable ramp 1 moves upwards, the two front hydraulic cylinders 5 retract with a long stroke, and the two rear hydraulic cylinders 5 retract with a short stroke. After retraction, the left limiting protrusion 30 and the right limiting protrusion 31 in the left and right limiting mechanisms contact each other, limiting the left and right swaying of the movable ramp 1. The front hull limiting block 32 and the rear hull limiting block 34 are respectively engaged in the positions of the front ramp limiting block 33 and the rear ramp limiting block 35, limiting the forward and backward movement of the movable ramp 1. When the rocking motion occurs, the lifting cylinder 16 is activated, driving the overturning plate 21 to move. At this time, the overturning plate 21 rotates the upper top plate 20 and the lower pressure plate 19. The lifting part 24 on the upper top plate 20 supports the movable ramp 1, and the lower pressure plate 19 extends out of the movable ramp 1 and presses into the lower pressure groove 26 on the bulkhead 8, pressing down on the lower pressure groove 26. At this time, the movable ramp 1 is lifted. After being lifted, when the through hole of the inner pin ear on the movable ramp 1 is coaxial with the through hole of the outer pin ear on the deck, the fixing pin 15 is inserted into the outer pin ear and the inner pin ear. At this time, the movable ramp 1 is fixed on the middle deck 3. At the same time, the sealing strip 13 is adhered to the sealing groove 14. The stainless steel flat bar on the movable ramp contacts the sealing strip and presses the sealing strip tightly into the sealing groove 14, realizing the separation between the compartments above the middle deck 3 and the compartments below the middle deck 3, serving as a watertight and fireproof separation.
[0045] The process of the movable ramp 1 moving downwards and retracting is as follows: the two rear hydraulic cylinders 5 are driven by a long stroke, and the two front hydraulic cylinders 5 are driven by a long stroke. At this time, the movable ramp 1 moves downwards. During the downward movement of the front of the movable ramp 1, the rear U-shaped plate 43 moves along the rear guide plate 41. At this time, the front U-shaped plate 39 disengages from the front guide plate 37. Therefore, during the downward movement of the rear, the front guide slide rail 9 and the front guide slider 6 do not restrict the downward movement of the rear of the movable ramp 1. When the rear of the movable ramp 1 moves upwards, the two rear hydraulic cylinders 5 are activated to retract by a long stroke, and the two front hydraulic cylinders 5 retract by a short stroke. After retraction, the left limiting protrusion 30 and the right limiting protrusion 31 in the left and right limiting mechanisms contact each other, limiting the left and right swaying of the movable ramp 1. The front hull limiting block 32 and the rear hull limiting block 34 are respectively locked in the positions of the front ramp limiting block 33 and the rear ramp limiting block 35, limiting the forward and backward swaying of the movable ramp 1. When the lifting cylinder 16 is activated, it drives the overturn plate 21 to move. At this time, the overturn plate 21 drives the upper top plate 20 and the lower pressure plate 19 to rotate. The lifting part 24 on the upper top plate 20 supports the movable ramp 1. The lower pressure plate 19 extends out of the movable ramp 1 and presses into the lower pressure groove 26 on the bulkhead 8, pressing down on the lower pressure groove 26. At this time, the movable ramp 1 is lifted. After being lifted, when the through hole of the inner pin ear on the movable ramp 1 is coaxial with the through hole of the outer pin ear on the deck, the fixing pin 15 is inserted into the outer pin ear and the inner pin ear. At this time, the movable ramp 1 is fixed on the middle deck 3. At the same time, the sealing strip 13 is adhered to the sealing groove 14. The stainless steel flat bar on the movable ramp contacts the sealing strip and presses the sealing strip tightly into the sealing groove 14, realizing the separation between the compartments above the middle deck 3 and the compartments below the middle deck 3, and playing the role of watertight separation and fireproof separation.
[0046] In the above process, the extension and retraction speeds of the hydraulic cylinders at their output ends are controlled by proportional valves.
[0047] In the above scheme, four hydraulic cylinders 5 and lifting cylinder 16 are connected to a hydraulic pump station via pipelines. The hydraulic pump station drives the four hydraulic cylinders 5 or lifting cylinder 16 respectively. The movable ramp 1 can move down on both the front and rear sides in a bidirectional manner through the four cylinders. Due to the above structure, the present invention has the advantages of simple structure, cost saving, high stability, reduced installation difficulty, and reduced installation time. The bidirectional movable ramp 1 driven by four cylinders has very low maintenance cost. For shipyards, it also reduces installation difficulty and saves installation and commissioning time.
Claims
1. A four-cylinder driven roll-on / roll-off bidirectional movable ramp, comprising a movable ramp, an upper deck, a middle deck, and a lower deck, wherein the middle deck on the side of the bulkhead is provided with a movable ramp movement hole, and a movable ramp is provided at the position of the movable ramp movement hole, characterized in that... Four hydraulic cylinders are symmetrically arranged at the front, rear, left, and right positions of the movable ramp. The cylinder seats of the hydraulic cylinders are rotatably connected to the lower part of the upper deck, and the output end of the hydraulic cylinders is rotatably connected to the movable ramp. Left and right limit mechanisms and front and rear limit mechanisms are installed between the lower part of the movable ramp and the middle deck. Lifting and fixing devices are symmetrically installed on the left and right sides of the lower part of the movable ramp. The side of the movable ramp closest to the bulkhead is connected to the front guide slider and the rear guide slider. The bulkhead is provided with front guide rails and rear guide rails that cooperate with the front guide slider and the rear guide slider. The movable ramp moves downward at the front side through the cooperation of the front guide slider and the rear guide slider. The movable ramp moves downward at the rear side through the cooperation of the rear guide slider and the front wing plate are connected to the front and rear sides of the movable ramp, respectively.
2. The four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 1, characterized in that... The movable ramp is provided with an annular sealing groove on the middle deck above it. The sealing strip is adhered in the sealing groove. After the movable ramp moves to the middle deck position, the stainless steel flat bar on the movable ramp comes into contact with the sealing strip and presses the sealing strip tightly into the sealing groove, thereby separating the compartments above the middle deck from the compartments below the middle deck, and playing the role of watertight separation and fireproof separation.
3. The four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 1, characterized in that... An outer pin lug is installed on the middle deck above the movable ramp, and an inner pin lug is installed at the corresponding position of the outer pin lug on the movable ramp. The outer pin lug and the inner pin lug are connected by a fixing pin. The fixing pin passes through the inner pin lug of the movable ramp and the outer pin lug of the middle deck to limit the movement of the movable ramp when it is fixed, thus ensuring safety.
4. A four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 1, characterized in that... The lifting and fixing device includes a lifting cylinder, an upper fixed shaft, a lower fixed shaft, a lower pressure plate, an upper top plate, a bend plate, a bend upper shaft, and a bend lower shaft. The cylinder seat of the lifting cylinder is rotatably connected to the lower side of the movable ramp. The output end of the lifting cylinder is rotatably connected to one end of the bend plate. The bend of the bend plate is rotatably connected to the lower end of the upper top plate via the bend upper shaft. The upper end of the upper top plate is rotatably connected to the movable ramp via the upper fixed shaft. The other end of the bend plate is rotatably connected to the upper end of the lower pressure plate via the bend lower shaft. The lower end of the lower pressure plate is rotatably connected to the movable ramp via the lower fixed shaft. The upper part of the upper top plate has a protruding lifting part. After the upper top plate rotates, the lifting part contacts the movable ramp. The upper part of the lower pressure plate has a protruding pressing part. After the lower pressure plate rotates, the pressing part contacts the pressing groove provided on the middle deck of the movable ramp side. The lower pressure plate continues to rotate and presses down the pressing groove, thereby lifting the movable ramp.
5. A four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 1, characterized in that... A central suspension rod mechanism is installed in the middle of the movable ramp to further ensure the safety of the ramp during operation.
6. A four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 5, characterized in that... The aforementioned intermediate boom mechanism includes an upper boom and a lower boom. The upper boom is hinged to the middle deck, and the lower boom is hinged to the movable ramp. The upper boom and the lower boom are hinged together by an intermediate pin. When the movable ramp is in operation, the connection safety of the movable ramp is ensured by the pulling of the upper boom and the lower boom.
7. A four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 1, characterized in that... The left and right limiting mechanism includes a left limiting protrusion and a right limiting protrusion. The left limiting protrusion is fixed to the bulkhead of the hull, and the right limiting protrusion is fixed to the side of the movable ramp. After the movable ramp moves up, the left limiting protrusion and the right limiting protrusion engage to make the movable ramp and the bulkhead have no gap, thus preventing the movable ramp from swaying left and right.
8. A four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 1, characterized in that... The aforementioned front and rear limiting mechanisms include a front hull limiting block, a front ramp limiting block, a rear hull limiting block, and a rear ramp limiting block. The front hull limiting block and the rear hull limiting block are respectively fixed to the bulkheads of the hull, and the front ramp limiting block and the rear ramp limiting block are respectively fixed to the movable ramp. The front side of the front ramp limiting block contacts and limits the rear side of the front hull limiting block, and the rear side of the rear ramp limiting block contacts and limits the front side of the rear hull limiting block.
9. A four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 1, characterized in that... The front guide rail and the rear guide rail are symmetrical structures, and the shapes of the front guide rail and the rear guide rail are along the downward trajectory of the front end of the movable ramp and the downward trajectory of the rear end of the movable ramp.
10. A four-cylinder driven roll-on / roll-off bidirectional movable ramp according to claim 9, characterized in that... The front guide rail includes a front support plate and a front guide plate. The front support plate is fixedly connected to the bulkhead, and the front guide plate is perpendicularly connected to the front support plate, with the front guide plate facing the front side of the front support plate. The front guide slider includes a front connecting plate and a front U-shaped plate. The front connecting plate is fixedly connected to the front side of the movable ramp, and the closed end of the front U-shaped plate is connected to the front connecting plate. The open end of the front U-shaped plate faces the rear side and is inserted into the front guide plate. The rear guide rail includes a rear support plate and a rear guide plate. The rear support plate is fixedly connected to the bulkhead, and the rear guide plate is perpendicularly connected to the rear support plate, with the rear guide plate facing the rear side of the rear support plate. The rear guide slider includes a rear connecting plate and a rear U-shaped plate. The rear connecting plate is fixedly connected to the rear side of the movable ramp, and the closed end of the rear U-shaped plate is connected to the rear connecting plate. The open end of the rear U-shaped plate faces the front side and is inserted into the rear guide plate.