Roll-on and roll-off bridge

Abstract

The invention relates to the technical field of wharf buildings, and provides a roll-on roll-off bridge used for connecting a wharf and a ship. The main bridge body comprises a head end and a tail end which are arranged at intervals in the front-back direction, the head end is supported on a wharf, and a limiting piece is installed at the tail end. The auxiliary bridge body is hinged to the tail end of the main bridge body and can be in lap joint with a deck of a ship, and the limiting piece can limit the rotation angle of the auxiliary bridge body relative to the main bridge body. The driving assembly comprises a portal frame, a driving part, a pull rope, a fixed pulley and a movable pulley, the portal frame spans the left side and the right side of the main bridge body and is fixed to the wharf, the fixed pulley is rotationally arranged on the portal frame, the movable pulley is rotationally arranged on the main bridge body, and the output end of the driving part is sequentially connected with the fixed pulley and the movable pulley through the pull rope; the main bridge body can be driven to swing relative to the wharf, and the swing axis is parallel to the left-right direction. The roll-on roll-off bridge can be always connected with a ship, adapts to the fluctuation influence of sea waves, and keeps the stability between the roll-on roll-off bridge and a wharf.

Description

Technical Field

[0001] The invention relates to the technical field of wharf construction, and in particular to a roll-on / roll-off bridge. Background Art

[0002] At present, there are two common methods of rolling on and off between docks and ships: 1. Dock roll-on bridge: The roll-on bridge is installed on the dock and can be retracted and lowered. After the ship arrives at the designated dock and berths, the dock roll-on bridge is directly lowered and connected to the hull deck to form a car channel. At present, the domestic dock roll-on bridge does not have a constant tension adjustment method. The front end of the roll-on bridge directly uses the hull deck as a support point for overlap, which cannot meet the hull's autonomous follow-up function during the up and down floating process. It will also cause impact and collision on the deck surface due to the up and down floating of the hull, affecting the hull structure. 2. Hull gangplank: During the ship construction process, a retractable stern gangplank or bow gangplank is built directly at the stern or bow of the hull. When the hull is berthed at the dock, the stern gangplank or bow gangplank is fully opened and lowered, directly connected to the dock, and the dock is used as a hard support point. This method has high requirements for the structural design of the hull, and is only for special ships, resulting in a large construction cost.

[0003] The existing wharf roll-on / roll-off bridge has the following defects:

[0004] 1. It does not have the constant tension function: it cannot autonomously follow the up and down floating of the hull to adjust its height, and cannot meet the tight connection between the ro-ro bridge and the hull deck, posing a potential risk to the passage of vehicles.

[0005] 2. Poor safety features: When the hull floats up and down due to the impact of waves, if the ro-ro bridge does not have the function of autonomous constant tension retraction and release, the hull deck will directly collide with the ro-ro bridge, causing damage to both the hull and the ro-ro bridge.

[0006] 3. Increase the construction cost of the hull: The roll-on / roll-off bridge is directly connected through the pressure-bearing hull, which has relatively high requirements for the construction of the hull structure, thus leading to an increase in the design and construction costs.

[0007] 4. It does not have the function of saving effort and reducing impact: At present, the roll-on / roll-off bridge at the wharf basically uses the oil cylinder to directly lift and retract the bridge body, which will produce lateral impact on the oil cylinder and cause damage to the seals. At the same time, the oil cylinder does not directly lift the roll-on / roll-off bridge through the effort-saving mechanism, resulting in a large size of the oil cylinder, which increases the cost and the difficulty of maintenance.

[0008] Therefore, there is an urgent need for a roll-on / roll-off bridge to solve the above technical problems. Summary of the invention

[0009] The purpose of the present invention is to provide a roll-on / roll-off bridge that can adapt to the ups and downs of waves, keep the connection with the ship, and also maintain stability with the dock.

[0010] To achieve this object, the present invention adopts the following technical solutions:

[0011] Ro-Ro bridge, used to connect the dock and the ship, including:

[0012] A main bridge body, the main bridge body comprising a head end and a tail end spaced apart in the front-rear direction, the head end being supported on the pier, and a limiting member being installed on the tail end;

[0013] A secondary bridge body, the secondary bridge body is hinged to the tail end of the main bridge body and can be overlapped on the deck of the vessel, and the limiter can limit the rotation angle of the secondary bridge body relative to the main bridge body;

[0014] A driving assembly, wherein the driving assembly comprises a gantry, a driving member, a pull rope, a fixed pulley and a movable pulley. The gantry is spanned across the left and right sides of the main bridge body and is fixed to the wharf. The fixed pulley is rotatably arranged on the gantry, and the movable pulley is rotatably arranged on the main bridge body. The output end of the driving member is connected to the fixed pulley and the movable pulley in sequence through the pull rope, so as to drive the main bridge body to swing relative to the wharf, and the axis of the swing is parallel to the left and right directions.

[0015] As a preferred technical solution for the roll-on / roll-off bridge, the head end of the main bridge body is rotatably connected to a roller, and the main bridge body contacts the wharf through the roller.

[0016] As a preferred technical solution for the roll-on / roll-off bridge, an even number of the drive assemblies are provided, which are respectively arranged on opposite sides of the main bridge body along the left-right direction, and the drive components are fixed to the wharf.

[0017] As a preferred technical solution of the roll-on / roll-off bridge, the driving assembly further comprises a tensioning wheel, which is installed on the wharf and / or the gantry, and the tensioning wheel can keep the pull rope between the driving member and the fixed pulley taut.

[0018] As a preferred technical solution for the above-mentioned roll-on / roll-off bridge, it also includes a first sensor, which is installed on the above-mentioned pull rope and is used to obtain the tension of the above-mentioned pull rope. The above-mentioned driving member can execute mode one or mode two. In the above-mentioned mode one, the above-mentioned driving member lifts the above-mentioned auxiliary bridge body away from the above-mentioned ship. In the above-mentioned mode two, the above-mentioned driving member can release or retract the above-mentioned pull rope so that the tension of the above-mentioned pull rope is maintained constant.

[0019] As a preferred technical solution of the roll-on / roll-off bridge, it also includes a second sensor, which is installed on the main bridge body and is used to obtain an angle signal between the main bridge body and the front-rear direction.

[0020] As a preferred technical solution of the above-mentioned roll-on / roll-off bridge, it also includes a third sensor, which is installed on the above-mentioned auxiliary bridge body and is used to obtain a mechanical signal between the above-mentioned auxiliary bridge body and the above-mentioned ship.

[0021] As a preferred technical solution of the above-mentioned roll-on / roll-off bridge, it also includes a control unit. The above-mentioned second sensor, the above-mentioned third sensor and the above-mentioned driving member are all communicatively connected to the above-mentioned control unit. The above-mentioned control unit can judge the timing of starting the above-mentioned driving member and adjust the elongation of the above-mentioned pull rope through the above-mentioned angle signal of the above-mentioned second sensor and / or the above-mentioned mechanical signal of the above-mentioned third sensor.

[0022] As a preferred technical solution for the roll-on / roll-off bridge, a first angle threshold α1 and a second angle threshold α2 are preset in the control unit. When the angle signal γ acquired by the second sensor satisfies α1≤γ≤α2, the control unit commands the drive member to execute the second mode; if γ<α1 or γ>α2, the control unit commands the drive member to execute the first mode.

[0023] As a preferred technical solution for the roll-on / roll-off bridge, the control unit is provided with a first mechanical threshold F1 and a second mechanical threshold F2. Under the condition of α1≤γ≤α2, when the mechanical signal F obtained by the third sensor satisfies F<F1, the control unit commands the driving member to release part of the pull rope; if F>F2, the control unit commands the driving member to recover part of the pull rope.

[0024] Beneficial effects of the present invention:

[0025] The present invention provides a roll-on / roll-off bridge for connecting a dock and a ship, comprising: a main bridge body, a secondary bridge body and a driving assembly. The main bridge body comprises a head end and a tail end spaced apart in the front-rear direction, the head end is supported on the dock, and a limiting member is installed at the tail end; the secondary bridge body is hinged to the tail end of the main bridge body and can be overlapped on the deck of the ship, and the limiting member can limit the rotation angle of the secondary bridge body relative to the main bridge body; the driving assembly comprises a gantry, a driving member, a pull rope, a fixed pulley and a movable pulley, the gantry is spanned on the left and right sides of the main bridge body and fixed to the dock, the fixed pulley is rotatably arranged on the gantry, and the movable pulley is rotatably arranged on the main bridge body, the output end of the driving member is sequentially connected to the fixed pulley and the movable pulley through a pull rope, and can drive the main bridge body to swing relative to the dock, and the axis of the swing is parallel to the left and right directions.

[0026] Specifically, the gantry includes two support columns and a crossbeam. The two support columns are arranged at intervals in the left-right direction and fixed to the dock. The crossbeam is arranged parallel to the left-right direction. The front and rear ends of the crossbeam are respectively fixed to the two support columns. The main bridge body is located between the two support columns. In the front-back direction, the front end of the main bridge body is supported by the dock. The rear end of the main bridge body is rotatably connected with a movable pulley. The gantry is equipped with a fixed pulley. In the vertical direction, the fixed pulley is located above the main bridge body. One end of the pull rope is connected to the output end of the driving member, and the other end is connected to the movable pulley after the fixed pulley is reversed. The driving member remains relatively fixed with the dock. The driving member can lower the rear end of the main bridge body by releasing the pull rope, and can raise the rear end of the main bridge body by recovering the pull rope. The rear end of the main bridge body is hinged with an auxiliary bridge body, which is located on one side of the main bridge body in the front-back direction. The auxiliary bridge body is used to connect with the plywood of the ship. The hinged connection between the auxiliary bridge body and the main bridge body allows the auxiliary bridge body to swing within a certain range with the ups and downs of the ship. The main bridge body is provided with a limiter. When the ups and downs of the ship are too large, the auxiliary bridge body and the main bridge body rotate at a certain angle and then abut against the limiter. The force applied by the ship to the auxiliary bridge body is transmitted to the main bridge body through the limiter. If the main bridge body also swings, the driving part releases or recovers the pull rope so that the pull rope can always stably connect the main bridge body and the gantry, so that the roll-on / roll-off bridge can always maintain connection with the ship, adapt to the ups and downs of the waves, and maintain stability between itself and the dock. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0028] Figure 1 is a schematic structural diagram of a roll-on / roll-off bridge provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a roll-on / roll-off bridge provided by an embodiment of the present invention;

[0030] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0031] Figure 4 is a schematic diagram of the structure of a drive assembly provided by an embodiment of the present invention;

[0032] Figure 5 This is a control logic diagram of a roll-on / roll-off bridge provided in an embodiment of the present invention.

[0033] In the figure:

[0034] X, front and back direction; Y, left and right direction; Z, vertical direction;

[0035] 100, main bridge body; 110, head end; 111, roller; 120, tail end;

[0036] 200, auxiliary bridge body;

[0037] 300, driving assembly; 310, gantry; 320, pull rope; 330, fixed pulley; 340, movable pulley; 350, driving member; 360, tensioning pulley. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] like Figures 1 to 5 As shown, the present invention provides a roll-on / roll-off bridge for connecting a dock and a ship, comprising: a main bridge body 100, a secondary bridge body 200 and a driving assembly 300. The main bridge body 100 comprises a head end 110 and a tail end 120 spaced apart in the front-rear direction X, the head end 110 is supported on the dock, and a limiting member is installed on the tail end 120; the secondary bridge body 200 is hinged to the tail end 120 of the main bridge body 100 and can be overlapped on the deck of the ship, and the limiting member can limit the rotation angle of the secondary bridge body 200 relative to the main bridge body 100; the driving assembly 300 comprises a gantry 310, a driving member 350, a pull rope 320 , a fixed pulley 330 and a movable pulley 340, the gantry 310 is spanned on the left and right sides of the main bridge body 100 and is fixed to the dock, the fixed pulley 330 is rotatably set on the gantry 310, and the movable pulley 340 is rotatably set on the main bridge body 100, and the output end of the driving member 350 is connected to the fixed pulley 330 and the movable pulley 340 in sequence through the pull rope 320, which can drive the main bridge body 100 to swing relative to the dock, and the swing axis is parallel to the left-right direction Y.

[0043] Specifically, the gantry 310 includes two support columns and a crossbeam. The two support columns are spaced apart in the left-right direction Y and fixed to the wharf. The crossbeam is arranged parallel to the left-right direction Y. The head and tail ends of the crossbeam are respectively fixed to the two support columns. The main bridge body 100 is located between the two support columns. In the front-back direction X, the head end 110 of the main bridge body 100 is supported by the wharf, and the tail end 120 of the main bridge body 100 is rotatably connected to a movable pulley 340. A fixed pulley is installed on the gantry 310. 330, in the vertical direction Z, the fixed pulley 330 is located above the main bridge body 100, one end of the pull rope 320 is connected to the output end of the driving member 350, and the other end is connected to the movable pulley 340 after being changed through the fixed pulley 330, and the driving member 350 remains relatively fixed with the dock. The driving member 350 can lower the tail end 120 of the main bridge body 100 by releasing the pull rope 320, and can raise the tail end 120 of the main bridge body 100 by recovering the pull rope 320. The tail end 120 of the main bridge body 100 is hinged with the auxiliary bridge body 200, which is located on one side of the main bridge body 100 in the front-rear direction X, and is used to connect with the cleat of the ship. The hinged connection between the auxiliary bridge body 200 and the main bridge body 100 enables the auxiliary bridge body 200 to swing with the vessel within a certain range. The main bridge body 100 is provided with a limit member. When the vessel rises and falls too much, the auxiliary bridge body 200 and the main bridge body 100 rotate at a certain angle and then abut against the limit member. The force applied by the vessel to the auxiliary bridge body 200 is transmitted to the main bridge body 100 through the limit member. If the main bridge body 100 also swings, the driving member 350 releases or recovers the pull rope 320 so that the pull rope 320 can always stably connect the main bridge body 100 and the gantry 310, so that the roll-on / roll-off bridge can always maintain connection with the vessel, adapt to the influence of the ups and downs of the waves, and maintain stability between itself and the dock.

[0044] Optionally, the head end 110 of the main bridge body 100 is rotatably connected to a roller 111 , and the main bridge body 100 contacts the dock through the roller 111 .

[0045] Exemplarily, a rotating shaft is installed at the head end 110 of the main bridge body 100, the axis of the rotating shaft is parallel to the left-right direction Y, and a plurality of rollers 111 are rotatably connected to the rotating shaft. The plurality of rollers 111 are arranged in sequence along the left-right direction Y, which can not only maintain the balance of the main bridge body 100 and the dock in the left-right direction Y, but also convert the friction between the main bridge body 100 and the dock into rolling friction or rotational friction.

[0046] Optionally, an even number of driving assemblies 300 are provided, which are respectively arranged on opposite sides of the main bridge body 100 along the left-right direction Y, and the driving member 350 is fixed to the dock.

[0047] In this way, an even number of driving components 300 work simultaneously, which can maintain the stability of the main bridge body 100 in the left-right direction Y and can also reduce the load pressure of a single driving component 350 .

[0048] Optionally, the driving assembly 300 further includes a tensioning wheel 360 , which is installed on the dock and / or the gantry 310 , and the tensioning wheel 360 can keep the pull rope 320 between the driving member 350 and the fixed pulley 330 taut.

[0049] Exemplarily, there are multiple tensioning wheels 360, which are divided into a first tensioning wheel 360 and a second tensioning wheel 360. The first tensioning wheel 360 is rotatably set on the dock, and the axis of the first tensioning wheel 360 is parallel to the vertical direction Z. The pull rope 320 passes through the peripheral side wall of the first tensioning wheel 360 to complete the switching and tensioning of the pull rope 320 in the horizontal direction. The second tensioning wheel 360 is rotatably set on the gantry 310, and the axis of the second tensioning wheel 360 is parallel to the horizontal direction. The pull rope 320 passes through the peripheral side wall of the second tensioning wheel 360 to complete the switching and tensioning of the pull rope 320 from the horizontal direction to the vertical direction Z.

[0050] Optionally, the roll-on / roll-off bridge also includes a first sensor, which is installed on the pull rope 320 and is used to obtain the tension of the pull rope 320. The driving member 350 can execute mode one or mode two. In mode one, the driving member 350 lifts the auxiliary bridge body 200 away from the ship. In mode two, the driving member 350 can release or retract the pull rope 320, so that the tension of the pull rope 320 is maintained constant.

[0051] In this way, when the ship completes the docking task with the wharf, or the current environment is not suitable for continuing to keep the ro-ro bridge connected to the ship, the driving member 350 executes mode 1, and lifts the main bridge body 100 and the auxiliary bridge body 200 by retrieving the pull rope 320, so that the auxiliary bridge body 200 is lifted away from the ship. When the ship docks with the wharf, the driving member 350 starts mode 2, and can obtain the current tension of the pull rope 320 according to the signal sent back by the first sensor. When the current tension is less than the tension threshold, the driving member 350 retracts the pull rope 320, tightens the pull rope 320, and increases the tension of the pull rope 320; when the current tension is greater than the tension threshold, the driving member 350 releases the pull rope 320, appropriately loosens the pull rope 320, and reduces the tension of the pull rope 320.

[0052] Furthermore, the tension threshold includes a first tension threshold f1 and a second tension threshold f2, satisfying 0<f1<f2. If the tension f of the current pull rope 320 obtained by the first sensor satisfies f1≤f≤f2, it meets the safety requirements. At this time, the drive member 350 can execute mode 2 for adjustment or be in standby mode; when 0<f<f1, it means that at this time, part of the mass of the main bridge body 100 is borne by the ship, causing the tail end 120 of the main body to swing upward, and the pull rope 320 is in a loose state and cannot limit the swing of the main bridge body 100. At this time, the drive member 350 retracts the pull rope 320, so that the pull rope 320 is tightened, satisfying f1≤f≤f2. At this time, the load of the ship can be reduced, the tilting of the ship can be avoided, and the stability of the main bridge body 100 can be maintained. When f2<f, it means that at this time, the entire mass of the main bridge body 100 is borne by the pull rope 320, and the main bridge body 100 and the auxiliary bridge body 200 may be separated from the ship. At this time, the driving member 350 releases the pull rope 320, satisfying f1≤f≤f2.

[0053] Optionally, the roll-on / roll-off bridge further includes a second sensor, which is installed on the main bridge body 100 and is used to obtain an angle signal between the main bridge body 100 and the front-rear direction X.

[0054] Optionally, the roll-on / roll-off bridge further includes a third sensor, which is installed on the auxiliary bridge body 200 and is used to obtain a mechanical signal between the auxiliary bridge body 200 and the vessel.

[0055] Optionally, the roll-on / roll-off bridge also includes a control unit, and the second sensor, the third sensor and the driving member 350 are all communicatively connected to the control unit. The control unit can determine the timing of starting the driving member 350 and adjust the elongation of the pull rope 320 through the angle signal of the second sensor and / or the mechanical signal of the third sensor.

[0056] Optionally, a first angle threshold α1 and a second angle threshold α2 are preset in the control unit. When the angle signal γ acquired by the second sensor satisfies α1≤γ≤α2, the control unit commands the driving member 350 to execute mode two; if it satisfies γ<α1 or γ>α2, the control unit commands the driving member 350 to execute mode one.

[0057] Since there is wave energy in the ocean, it can drive the ship to rise and fall with the waves, causing the main bridge body 100 connected to the ship to change its inclination angle with the front-back direction X. When α1≤γ≤α2, the control unit determines that the current environment is suitable for the ship to dock with the dock, and then commands the drive member 350 to execute mode 2, and adjust the tension of the pull rope 320 at any time to adapt to the rising and falling ship. However, when γ<α1 or γ>α2, the control unit determines that the ship is rising and falling too much at this time and is no longer suitable for maintaining the connection, and then commands the drive member 350 to execute mode 1, retract the pull rope 320, pull up the main bridge body 100 and the auxiliary bridge body 200, and release the connection with the ship.

[0058] Furthermore, the roll-on / roll-off bridge also includes an intercepting device, which is arranged at the head end 110 of the main bridge body 100. When α1≤γ≤α2, the intercepting device is idle and the vehicle can board the ship through the main bridge body 100. When γ<α1 or γ>α2, the control unit first commands the intercepting device to start, restricts the vehicle from driving onto the main bridge body 100, and then commands the driving member 350 to execute mode one.

[0059] Optionally, the control unit is provided with a first mechanical threshold F1 and a second mechanical threshold F2. Under the condition of α1≤γ≤α2, when the mechanical signal F obtained by the third sensor satisfies, if F<F1, the control unit commands the driving member 350 to release part of the pull rope 320; if F>F2, the control unit commands the driving member 350 to retract part of the pull rope 320.

[0060] Assume that when the ship docks, its mass is G1 and its height from the dock is H1. At this time, the impact of the ship's ups and downs caused by the waves is ignored.

[0061] As more cargo is transported from the dock to the ship, the ship load increases, satisfying G1+G2>G1, where G2 is the total weight of the cargo. The ship sinks as a whole, and the height of the dock is H2. H2

[0062] ​As more cargo is unloaded from the ship to the dock, the ship load decreases, and G1-G2<G1 is satisfied. Then the ship rises as a whole, and the height from the dock is H3. H3>H1, and an upward force is applied to the auxiliary bridge body 200, that is, F>F2. A "concave" phenomenon occurs between the main bridge body 100 and the auxiliary bridge body 200, and the drive member 350 is commanded to retract part of the pull rope 320 to restore the relative position of the tail end 120 of the main bridge body 100 and the deck of the ship. A smooth transition occurs between the main bridge body 100 and the auxiliary bridge body 200, which is convenient for vehicles to pass.

[0063] Furthermore, the third sensor can eliminate the value fluctuation caused by the passing of vehicles. This is a prior art and will not be discussed in detail here.

[0064] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Roll-on / roll-off bridge, used to connect the dock and the ship, characterized by: include: A main bridge body (100), the main bridge body (100) comprising a head end (110) and a tail end (120) spaced apart in a front-rear direction (X), the head end (110) being supported on the pier, and a limiting member being installed on the tail end (120); A secondary bridge body (200), the secondary bridge body (200) being hinged to the tail end (120) of the main bridge body (100) and capable of being overlapped on the deck of the vessel, and the limiting member being capable of limiting the rotation angle of the secondary bridge body (200) relative to the main bridge body (100); A driving assembly (300), the driving assembly (300) comprising a gantry (310), a driving member (350), a pull rope (320), a fixed pulley (330) and a movable pulley (340), the gantry (310) being arranged across the left and right sides of the main bridge body (100) and being fixed to the dock, the fixed pulley (330) being rotatably arranged on the gantry (310), the movable pulley (340) being rotatably arranged on the main bridge body (100), the output end of the driving member (350) being connected to the fixed pulley (330) and the movable pulley (340) in sequence through the pull rope (320), and being capable of driving the main bridge body (100) to swing relative to the dock, and the axis of the swing being parallel to the left-right direction (Y).

2. The roll-on / roll-off bridge according to claim 1, characterized in that: The head end (110) of the main bridge body (100) is rotatably connected to a roller (111), and the main bridge body (100) contacts the dock via the roller (111).

3. The roll-on / roll-off bridge according to claim 1, characterized in that: An even number of the driving components (300) are provided, respectively disposed on two opposite sides of the main bridge body (100) along the left-right direction (Y), and the driving member (350) is fixed to the dock.

4. The roll-on / roll-off bridge according to claim 1, characterized in that: The driving assembly (300) further comprises a tensioning wheel (360), wherein the tensioning wheel (360) is installed on the dock and / or the gantry (310), and the tensioning wheel (360) is capable of keeping the pull rope (320) between the driving member (350) and the fixed pulley (330) in tension.

5. The roll-on / roll-off bridge according to claim 1, characterized in that: It also includes a first sensor, which is installed on the pull rope (320) and is used to obtain the tension of the pull rope (320). The driving member (350) can execute mode one or mode two. In mode one, the driving member (350) lifts the auxiliary bridge body (200) away from the ship. In mode two, the driving member (350) can release or retract the pull rope (320) so that the tension of the pull rope (320) is maintained constant.

6. The roll-on / roll-off bridge according to claim 5, characterized in that: It also includes a second sensor, which is installed on the main bridge body (100) and is used to obtain an angle signal between the main bridge body (100) and the front-rear direction (X).

7. The roll-on / roll-off bridge according to claim 6, characterized in that: It also includes a third sensor, which is installed on the auxiliary bridge body (200) and is used to obtain a mechanical signal between the auxiliary bridge body (200) and the vessel.

8. The roll-on / roll-off bridge according to claim 7, characterized in that: It also includes a control unit, and the second sensor, the third sensor and the driving member (350) are all communicatively connected to the control unit. The control unit can determine the timing of starting the driving member (350) and adjust the elongation of the pull rope (320) through the angle signal of the second sensor and / or the mechanical signal of the third sensor.

9. The roll-on / roll-off bridge according to claim 8, characterized in that: The control unit is preset with a first angle threshold α1 and a second angle threshold α2. When the angle signal γ acquired by the second sensor satisfies α1≤γ≤α2, the control unit commands the drive member (350) to execute the second mode; if γ<α1 or γ>α2, the control unit commands the drive member (350) to execute the first mode.

10. The roll-on / roll-off bridge according to claim 9, characterized in that: The control unit is provided with a first mechanical threshold F1 and a second mechanical threshold F2. Under the condition of α1≤γ≤α2, when the mechanical signal F obtained by the third sensor satisfies F<F1, the control unit commands the driving member (350) to release part of the pull rope (320); if it satisfies F>F2, the control unit commands the driving member (350) to retract part of the pull rope (320).

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