Novel boarding ladder embarkation device for boat
By providing a locking mechanism and a guide sleeve and guide rod structure on the gangway, the problems of accidental deployment of the gangway in the folded state and damage to the hydraulic cylinder are solved, and stable use and automatic control on small ships are achieved.
Patent Information
- Application Number
- CN202422798377.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-18
AI Technical Summary
The existing gangway ladder lacks a locking mechanism when in the folded state, making it easily affected by waves and sea wind, leading to accidental deployment. The stress on the hydraulic cylinder increases the risk of damage. In addition, the traditional gangway ladder is large in size and complex to install, making it difficult to popularize on small ships.
A new bow gangway boarding device for boats is designed. By setting a locking mechanism and a pitching mechanism, the locking mechanism is used to stably lock the first ladder frame in the folded state, and the combined structure of the guide sleeve and the guide rod is used to avoid direct plugging and unplugging, and the automatic control function is added.
It reduces the risk of damage to the hydraulic cylinder, reduces the wear of the locking parts, and improves the degree of automated control of the gangway. It is suitable for small vessels, especially catamarans and high-speed boats.
Smart Images
Figure CN223327683U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of ship boarding devices and equipment, and in particular to a novel bow gangway boarding device for boats. Background Art
[0002] Gangway is an important tool used on offshore platforms or ships. It is usually folded inside the ship's side and extended outboard when in use. It is arranged obliquely along the side of the ship for people and cargo to get on and off the ship. It can be used for the transportation and delivery of people or cargo.
[0003] When the existing gangway ladder is folded inside the ship's side, the gangway ladder is maintained in the folded state by the resistance of the hydraulic cylinder in the non-working state. That is to say, the gangway ladder does not have a special locking mechanism to prevent the accidental deployment of the gangway ladder in the folded state. The gangway ladder may be affected by waves and sea winds in the folded state, which increases the risk of accidental deployment of the gangway ladder. In addition, the risk of the gangway ladder moving will also increase when the ship is in the driving state of acceleration, deceleration, etc. The above factors make the hydraulic cylinder always in a stressed state when the gangway ladder is in the folded state, which increases the risk of damage to the hydraulic cylinder and the risk of accidental deployment of the gangway ladder.
[0004] In addition, gangways with traditional technology usually work at docks. The gangway is carried between the dock and the ship through hydraulic cylinder operation. One end of the gangway is placed on the hull and the other end is carried on the dock. People can walk on the gangway smoothly. However, these gangways are not convenient for working in shallow waters near the shore. They are also large in size and complicated to install. They are mostly used on large passenger and vehicle ferries and have not yet been popularized on small hulls, especially on catamarans and high-speed boats. Utility Model Content
[0005] In order to solve the above-mentioned problems, the present application provides a novel bow gangway boarding device for boats. The novel bow gangway boarding device for boats is provided with a locking mechanism, so that the first ladder frame can be stably maintained in a retracted state, thereby reducing the risk of damage to the pitching mechanism caused by maintaining the retracted state of the first ladder frame. The technical solutions adopted in the present application are as follows:
[0006] A new bow gangway boarding device for a boat, comprising:
[0007] The gangway ladder comprises a first ladder frame, one end of the first ladder frame is suitable for being hinged to the boarding port of the hull, when the first ladder frame is retracted in the boarding port, it is in a retracted state, and when the first ladder frame is released from the boarding port, it is in an extended state; a pitching mechanism, the pitching mechanism is respectively hinged to the hull and the first ladder frame, the pitching mechanism is used to drive the first ladder frame to switch between the retracted state and the extended state; the locking mechanism, the locking mechanism is respectively connected to the hull and the first ladder frame, the locking mechanism is used to lock the first ladder frame in the retracted state.
[0008] By providing the locking mechanism, the first ladder frame can be stably maintained in the folded state, thereby reducing the risk of damage to the hydraulic cylinder caused by maintaining the folded state of the first ladder frame.
[0009] In some embodiments, the locking mechanism includes a first telescopic component and a plug plate with a socket, the first telescopic component is installed on one side of the boarding port, and the plug plate is installed on the first ladder rack; in the folded state, the telescopic end of the first telescopic component is inserted into the socket of the plug plate to lock the first ladder rack in the folded state; when the telescopic end of the first telescopic component is pulled out of the socket of the plug plate, the locking mechanism releases the lock on the first ladder rack.
[0010] In some embodiments, the first telescopic assembly includes a first telescopic member, a guide sleeve and a guide rod, an ear plate with a perforation is provided on one side of the boarding port, one end of the guide sleeve is installed on the side of the ear plate away from the boarding port and is coaxial with the perforation, the other end of the guide sleeve is fixed with the first telescopic member, the guide rod is connected to the telescopic shaft of the first telescopic member and passes through the perforation, and the guide rod can move back and forth in the perforation following the extension and contraction of the telescopic shaft; in the retracted state, the guide rod is inserted into the socket of the plug plate to lock the first ladder rack in the retracted state; when the guide rod is pulled out of the socket of the plug plate, the locking mechanism releases the lock on the first ladder rack.
[0011] By providing a guide sleeve and a guide rod on the basis of the first telescopic member, the telescopic shaft of the first telescopic member is prevented from being directly inserted into the socket of the plug plate when the locking mechanism is used to lock the first ladder frame. This causes the telescopic shaft of the first telescopic member to be subjected to a large radial force. This not only increases the risk of damage to the first telescopic member, but also requires a first telescopic member that can withstand large radial forces, which will increase the procurement cost of the first telescopic member. By adding a guide sleeve and a guide rod, the first ladder frame is locked by inserting and removing the guide rod in the socket of the plug plate, which achieves safe isolation between the first telescopic member and the socket, eliminating the need for direct insertion and removal of the first telescopic member from the socket, and greatly reducing the risk of damage to the first telescopic member.
[0012] In some embodiments, a bushing is provided in the through hole, and the guide rod is adapted to the bushing.
[0013] By installing the bushing in the through hole, the smoothness of the guide rod when being inserted and removed from the plug hole of the plug plate is improved, and the wear of the guide rod is also reduced.
[0014] In some embodiments, the gangway ladder further includes a second ladder frame and a folding mechanism, wherein the two ends of the first ladder frame are respectively a first end and a second end, the first end of the first ladder frame is suitable for being hinged to the boarding port, and the second end of the first ladder frame is hinged to one end of the second ladder frame, and the folding mechanism is respectively connected to the first ladder frame and the second ladder frame, and the folding mechanism is used to control the rotation of the second ladder frame relative to the first ladder frame.
[0015] In some embodiments, the folding mechanism includes a second telescopic member, a first linkage member and a linkage rod; the first linkage member includes three hinge points distributed in a triangle, and the three hinge points are respectively a first hinge point, a second hinge point and a third hinge point; one end of the second telescopic member is hinged to the first ladder frame, and the other end is hinged to the first hinge point; the second end of the first ladder frame is hinged to the second hinge point; one end of the linkage rod is hinged to the second ladder frame, and the other end is hinged to the third hinge point; when the second telescopic member is extended, the second ladder frame gradually unfolds relative to the first ladder frame, and when the second telescopic member is shortened, the second ladder frame gradually folds relative to the first ladder frame.
[0016] In some embodiments, the pitching mechanism includes a telescopic cylinder, one end of the telescopic cylinder is hinged to one side of the boarding port, and the other end is hinged to the first ladder frame.
[0017] In some embodiments, the telescopic cylinder and the second telescopic member are both provided with a distance sensor or a position sensor.
[0018] By setting up a distance sensor or a position sensor and using the information fed back by the distance sensor or the position sensor, it is possible to determine whether the telescopic cylinder and the second telescopic member have reached the expected telescopic distance or telescopic position, and then the telescopic cylinder and the second telescopic member can be controlled to continue to telescope or stop telescopic. In this way, automatic control of the folding and unfolding of the first ladder frame and the folding and unfolding of the second ladder frame can be achieved, thereby improving the degree of automation control of the entire gangway.
[0019] In some embodiments, the telescopic cylinder and the second telescopic member are both provided with a limit switch, and the limit switch is used to control the telescopic cylinder and the second telescopic member to stop telescoping when the telescopic cylinder and the second telescopic member are telescoping to a corresponding preset length.
[0020] By setting a limit switch, the telescopic cylinder and the second telescopic member can be shut down when they are extended to the expected position or retracted to the expected position, preventing the telescopic cylinder and the second telescopic member from exceeding the preset stroke and reducing the risk of damage to the gangway.
[0021] In some embodiments, the first ladder frame and the second ladder frame are both provided with a climbing surface, and the climbing surface is treated with anti-slip treatment.
[0022] The present application provides a novel bow gangway boarding device for a boat, which has at least one of the following beneficial effects:
[0023] 1. The present application provides a novel bow gangway boarding device for a boat. By providing a locking mechanism, the first ladder frame can be stably maintained in a folded state, thereby reducing the risk of damage to the pitching mechanism caused by maintaining the folded state of the first ladder frame.
[0024] 2. This application provides a novel bow gangway boarding device for boats. By providing a guide sleeve and guide rod on the basis of a first telescopic member, this avoids the situation in which the telescopic shaft of the first telescopic member is directly inserted into the socket of the plug plate when the locking mechanism is used to lock the first ladder frame. This would cause the telescopic shaft of the first telescopic member to be subjected to large radial forces. This would increase the risk of damage to the first telescopic member and require a first telescopic member capable of withstanding large radial forces, which would increase the procurement cost of the first telescopic member. By adding a guide sleeve and guide rod, the first ladder frame is locked by inserting and removing the guide rod in the socket of the plug plate. This ensures safe isolation between the first telescopic member and the socket, eliminating the need for direct insertion and removal of the first telescopic member from the socket, and significantly reducing the risk of damage to the first telescopic member.
[0025] 3. The present application provides a novel bow gangway boarding device for boats, which improves the smoothness of inserting and removing the guide rod from the insertion hole of the plug plate by installing a bushing in the through hole, and also reduces the wear of the guide rod.
[0026] 4. The present application provides a novel bow gangway boarding device for a boat. By setting a distance sensor or a position sensor and utilizing the information fed back by the distance sensor or the position sensor, it is possible to determine whether the telescopic cylinder and the second telescopic member have reached the expected telescopic distance or telescopic position, and then the telescopic cylinder and the second telescopic member can be controlled to continue to telescope or stop telescope. In this way, automatic control of the folding and unfolding of the first ladder frame and the folding and unfolding of the second ladder frame can be achieved, thereby improving the degree of automation control of the entire gangway.
[0027] 5. The present application provides a novel bow gangway boarding device for boats. By setting a limit switch, the telescopic cylinder and the second telescopic member can be shut down when the telescopic cylinder and the second telescopic member are extended to the expected position or retracted to the expected position, thereby preventing the telescopic cylinder and the second telescopic member from exceeding the preset stroke and reducing the risk of damage to the gangway. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The following will explain the preferred embodiment in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above characteristics, technical features, advantages and implementation methods of a new bow gangway boarding device for boats:
[0029] Figure 1 This is a schematic diagram of a folded state of an embodiment of a gangway;
[0030] Figure 2 yes Figure 1 An enlarged view of part A in the embodiment;
[0031] Figure 3 This is a schematic diagram of an embodiment of a gangway ladder in an unfolded state;
[0032] Figure 4 yes Figure 3 An enlarged view of part B in the example;
[0033] Figure 5 is a perspective view of an embodiment of a gangway in a folded state;
[0034] Figure 6 It is a perspective view of an embodiment of a gangway in an unfolded state.
[0035] Description of Figure Numbers:
[0036] Hull 1, boarding port 2, first ladder 3, first telescopic member 4, plug plate 5, plug hole 6, guide sleeve 7, guide rod 8, ear plate 9, second ladder 10, second telescopic member 11, first linkage member 12, linkage rod 13, pitching mechanism 14. DETAILED DESCRIPTION
[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.
[0038] To simplify the drawings, only the parts relevant to this application are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."
[0039] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
[0040] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0041] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0042] refer to Figures 1-6 The present application provides a novel bow gangway boarding device for a boat, comprising: a gangway, the gangway comprising a first ladder frame 3, one end of the first ladder frame 3 being adapted to be hinged to the boarding port 2 of the hull 1, when the first ladder frame 3 is folded in the boarding port 2, it is in a folded state, and when the first ladder frame 3 is released from the boarding port 2, it is in an unfolded state; a pitching mechanism 14, the pitching mechanism 14 being hinged to the hull 1 and the first ladder frame 3, respectively, the pitching mechanism 14 being used to drive the first ladder frame 3 to switch between a folded state and an unfolded state; a locking mechanism, the locking mechanism being connected to the hull 1 and the first ladder frame 3, respectively, the locking mechanism being used to lock the first ladder frame 3 in the folded state.
[0043] Specifically, the pitch mechanism 14 includes a telescopic cylinder, the cylinder barrel of which is hinged to one side of the boarding gate 2, and the piston rod of which is hinged to the first ladder frame 3. As the piston rod gradually retracts into the cylinder barrel, the first ladder frame 3 gradually rotates toward the boarding gate 2, ultimately reaching a retracted state. As the piston rod gradually extends from the cylinder barrel, the first ladder frame 3 gradually rotates away from the boarding gate 2, ultimately reaching an extended state. The telescopic cylinder has a fast response speed, enabling rapid and precise control of the rotation angle of the first ladder frame 3. It is understood that the telescopic cylinder can be replaced with a telescopic air cylinder or other structure with telescopic function.
[0044] In other embodiments, the pitching mechanism includes a winch and a rope, one end of the rope is connected to the winch, and the other end is connected to the first ladder frame 3, and the winch is installed on one side of the boarding gate 2. The winch is controlled to retract the rope, so that the first ladder frame 3 reaches a retracted state (the first ladder frame 3 is in an inclined state), and when the winch releases the rope and with the help of the gravity of the first ladder frame 3, the first ladder frame 3 can be deployed.
[0045] refer to Figure 1-Figure 4In one embodiment, the locking mechanism includes a first telescopic assembly and a plug plate 5 with a socket 6. The first telescopic assembly is installed on one side of the boarding gate 2, and the plug plate 5 is installed on the first ladder frame 3. When in the folded state, the telescopic end of the first telescopic assembly is inserted into the socket 6 of the plug plate 5 to lock the first ladder frame 3 in the folded state. When the telescopic end of the first telescopic assembly is pulled out of the socket 6 of the plug plate 5, the locking mechanism releases the lock on the first ladder frame 3.
[0046] Specifically, the first telescopic assembly includes a first telescopic member 4, which is mounted on one side of the boarding gate 2. The telescopic end of the first telescopic member 4 is inserted into the socket 6 of the plugboard 5 to lock the first ladder frame 3 in the retracted state. When the telescopic end of the first telescopic member 4 is removed from the socket 6 of the plugboard 5, the locking mechanism releases the lock on the first ladder frame 3. The first telescopic member 4 can be equipped with a telescopic cylinder, a telescopic cylinder, or other structure with a telescopic function.
[0047] refer to Figure 1-Figure 4 In other embodiments, the first telescopic assembly includes a first telescopic member 4, a guide sleeve 7, and a guide rod 8. A lug plate 9 with a perforation is provided on one side of the boarding gate 2. One end of the guide sleeve 7 is mounted on the side of the lug plate 9 away from the boarding gate 2 and is coaxial with the perforation. The first telescopic member 4 is fixed to the other end of the guide sleeve 7. The guide rod 8 is connected to the telescopic shaft of the first telescopic member 4 and extends through the perforation. The guide rod 8 can reciprocate in the perforation as the telescopic shaft extends and retracts. In the retracted state, the guide rod 8 is inserted into the socket 6 of the plug plate 5 to lock the first ladder frame 3 in the retracted state. When the guide rod 8 is removed from the socket 6 of the plug plate 5, the locking mechanism releases the lock on the first ladder frame 3. The first telescopic member 4 can optionally be a telescopic oil cylinder, a telescopic air cylinder, or other structure with a telescopic function.
[0048] It is understandable that by providing the guide sleeve 7 and the guide rod 8 on the basis of the first telescopic member 4, it is avoided that when the locking mechanism is used to lock the first ladder frame 3, the telescopic shaft of the first telescopic member 4 is directly inserted into the socket 6 of the plugboard 5, causing the telescopic shaft of the first telescopic member 4 to be subjected to a large radial force. This, on the one hand, increases the risk of damage to the first telescopic member 4, and on the other hand, requires a first telescopic member 4 that can withstand a large radial force, which will increase the procurement cost of the first telescopic member 4. By adding the guide sleeve 7 and the guide rod 8, the first ladder frame 3 is locked by plugging and unplugging the guide rod 8 in the socket 6 of the plugboard 5, which achieves safe isolation between the first telescopic member 4 and the socket 6, eliminates the need for direct plugging and unplugging of the first telescopic member 4 and the socket 6, and greatly reduces the risk of damage to the first telescopic member 4.
[0049] Furthermore, a bushing is provided in the perforation, and the guide rod 8 is adapted to the bushing. By installing the bushing in the perforation, the smoothness of the guide rod 8 when plugging and unplugging in the jack 6 of the inserting plate 5 is improved, and the wear of the guide rod 8 is also reduced.
[0050] refer to Figures 1-6 In one embodiment, the gangway ladder further includes a second ladder frame 10 and a folding mechanism. The two ends of the first ladder frame 3 are respectively a first end and a second end. The first end of the first ladder frame 3 is hinged to the boarding gate 2, and the second end of the first ladder frame 3 is hinged to one end of the second ladder frame 10. The folding mechanism is respectively connected to the first ladder frame 3 and the second ladder frame 10, and the folding mechanism is used to control the rotation of the second ladder frame 10 relative to the first ladder frame 3.
[0051] Specifically, the folding mechanism includes a second telescopic member 11, a first linkage member 12, and a linkage rod 13; the first linkage member 12 includes three hinge points distributed in a triangle, namely a first hinge point, a second hinge point, and a third hinge point; one end of the second telescopic member 11 is hinged to the first ladder frame 3, and the other end is hinged to the first hinge point; the second end of the first ladder frame 3 is hinged to the second hinge point; one end of the linkage rod 13 is hinged to the second ladder frame 10, and the other end is hinged to the third hinge point; when the second telescopic member 11 is extended, the second ladder frame 10 gradually unfolds relative to the first ladder frame 3, and when the second telescopic member 11 is shortened, the second ladder frame 10 gradually folds relative to the first ladder frame 3. In other embodiments, the folding mechanism can be other mechanisms capable of achieving folding, such as a rotary drive, wherein the main body of the rotary drive is installed at the second end of the first ladder frame 3, and the rotary drive turntable is connected to the second ladder frame 10. The second telescopic member 11 can optionally be a telescopic oil cylinder, a telescopic air cylinder, or other structures with telescopic functions.
[0052] Furthermore, the telescopic cylinder and the second telescopic member 11 in the pitch mechanism 14 are each equipped with a distance sensor or a position sensor. It is readily understood that by providing the distance sensor or position sensor, and utilizing the information fed back by the distance sensor or position sensor, it is possible to determine whether the telescopic cylinder and the second telescopic member 11 have reached the desired telescopic distance or telescopic position, and thereby control the telescopic cylinder and the second telescopic member 11 to continue or stop telescoping. This allows for automatic control of the retraction and deployment of the first ladder frame 3 and the folding and deployment of the second ladder frame 10, thereby enhancing the degree of automated control of the entire gangway ladder.
[0053] Furthermore, both the telescopic cylinder and the second telescopic member 11 are equipped with limit switches, which are used to control the telescopic cylinder and the second telescopic member 11 to stop extending and retracting when they reach the corresponding preset lengths. By providing the limit switches, the telescopic cylinder and the second telescopic member 11 can be shut down when they are extended or retracted to the expected position, preventing the telescopic cylinder and the second telescopic member 11 from exceeding the preset travel range and reducing the risk of damage to the gangway ladder.
[0054] In one embodiment, both the first ladder frame 3 and the second ladder frame 10 are provided with a climbing surface, and the climbing surface is treated with anti-skid treatment, for example, some anti-skid convex points or anti-skid convex strips are provided on the climbing surface.
[0055] The novel bow gangway boarding device for boats provided in this application has a locking function for the first ladder frame 3, which allows the first ladder frame 3 to be stably maintained in the retracted state, reducing the risk of damage to the pitching mechanism 14 caused by maintaining the retracted state of the first ladder frame 3. The novel bow gangway boarding device for boats provided in this application is compact and easy to install, suitable for operation in shallow waters near the coast, and can be used on catamarans and high-speed boats.
[0056] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be noted that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be considered as the scope of protection of the present application.
Claims
1. A new type of bow gangway boarding device for boats, characterized in that: include: The gangway ladder comprises a first ladder frame, one end of the first ladder frame is adapted to be hinged to a boarding port on the hull, the first ladder frame is in a folded state when folded in the boarding port, and is in an extended state when the first ladder frame is released from the boarding port; a pitching mechanism, the pitching mechanism being hinged to the hull and the first ladder frame respectively, the pitching mechanism being used to drive the first ladder frame to switch between the folded state and the deployed state; A locking mechanism is connected to the hull and the first ladder frame respectively, and is used to lock the first ladder frame in the folded state.
2. A novel bow gangway boarding device for boats according to claim 1, characterized in that: The locking mechanism includes a first telescopic component and a plug plate with a socket, the first telescopic component is installed on one side of the boarding gate, and the plug plate is installed on the first ladder frame; in the folded state, the telescopic end of the first telescopic component is inserted into the plug hole of the plug plate to lock the first ladder frame in the folded state; when the telescopic end of the first telescopic component is pulled out of the plug hole of the plug plate, the locking mechanism releases the lock on the first ladder frame.
3. A novel bow gangway boarding device for boats according to claim 2, characterized in that: The first telescopic assembly includes a first telescopic member, a guide sleeve and a guide rod. An ear plate with a perforation is provided on one side of the boarding port, one end of the guide sleeve is installed on the side of the ear plate away from the boarding port and is coaxial with the perforation, and the other end of the guide sleeve is fixed with the first telescopic member, the guide rod is connected to the telescopic shaft of the first telescopic member and is passed through the perforation, and the guide rod can move back and forth in the perforation following the extension and contraction of the telescopic shaft; in the retracted state, the guide rod is inserted into the socket of the plug plate to lock the first ladder rack in the retracted state; when the guide rod is pulled out of the socket of the plug plate, the locking mechanism releases the lock on the first ladder rack.
4. A novel bow gangway boarding device for boats according to claim 3, characterized in that: A bushing is provided in the through hole, and the guide rod is adapted to the bushing.
5. A novel bow gangway boarding device for boats according to any one of claims 1 to 4, characterized in that: The gangway ladder also includes a second ladder frame and a folding mechanism. The two ends of the first ladder frame are respectively a first end and a second end. The first end of the first ladder frame is suitable for being hinged to the boarding port, and the second end of the first ladder frame is hinged to one end of the second ladder frame. The folding mechanism is respectively connected to the first ladder frame and the second ladder frame, and the folding mechanism is used to control the rotation of the second ladder frame relative to the first ladder frame.
6. A novel bow gangway boarding device for boats according to claim 5, characterized in that: The folding mechanism includes a second telescopic member, a first linkage member and a linkage rod; the first linkage member includes three hinge points distributed in a triangle, namely a first hinge point, a second hinge point and a third hinge point; one end of the second telescopic member is hinged to the first ladder frame, and the other end is hinged to the first hinge point; the second end of the first ladder frame is hinged to the second hinge point; one end of the linkage rod is hinged to the second ladder frame, and the other end is hinged to the third hinge point; when the second telescopic member is extended, the second ladder frame gradually unfolds relative to the first ladder frame, and when the second telescopic member is shortened, the second ladder frame gradually folds relative to the first ladder frame.
7. A novel bow gangway boarding device for boats according to claim 6, characterized in that: The pitching mechanism includes a telescopic oil cylinder, one end of the telescopic oil cylinder is hinged to one side of the boarding port, and the other end is hinged to the first ladder frame.
8. A novel bow gangway boarding device for boats according to claim 7, characterized in that: The telescopic oil cylinder and the second telescopic member are both provided with a distance sensor or a position sensor.
9. A novel bow gangway boarding device for boats according to claim 8, characterized in that: The telescopic oil cylinder and the second telescopic member are both provided with a limit switch, and the limit switch is used to control the telescopic oil cylinder and the second telescopic member to stop telescoping when the telescopic oil cylinder and the second telescopic member are telescoping to a corresponding preset length.
10. A novel bow gangway boarding device for boats according to any one of claims 6 to 9, characterized in that: The first ladder frame and the second ladder frame are both provided with a climbing surface, and the climbing surface is treated with anti-slip treatment.