TW201544397A - Lashing bridge for a cargo ship - Google Patents

Abstract

Lashing bridge for a cargo ship, which lashing bridge is fixed directly or indirectly to hull structures of the cargo ship. The invention is implemented in such a way that at least one vibration damper is fastened in a fixed or detachable manner to the lashing bridge, which vibration damper comprises a mass element (3), which is connected to the lashing bridge via a flexible element (5) and/or via a damping element (4).

Description

Carriage bridge

The present invention relates to a draw bridge for a cargo ship that is fixed directly or indirectly to the hull structure of the cargo ship.

The tie-pull bridge is a support skeleton to be installed on the deck of the cargo ship intended to transport the container, and the tie rods to be used to support the container are fixed to the skeleton.

On cargo ships, containers are generally transported in multiple rows and in a stack of multiple layers below the deck and above the deck. On the deck of the cargo ship is a detachable hatch cover to close the holders underneath. The container is transported on the hatch cover. The support structures for the containers on the deck (so-called draw bridges) are mounted at a distance from one another such that the hatch covers can be removed and lowered with the crane in connection with the unloading and loading of the cargo of the vessel.

After the container has been loaded onto the vessel, at least some of the containers on the deck are secured to the drawbridge at their ends by tie rods and turnbuckles.

Pulling bridges are typically placed in the transverse direction of the hull and from the ship One side extends to the other side. Since the structure of the draw bridge is both narrow and high, the vibration of the hull caused by the operation of the ship engine and the rotation of the propeller may cause strength problems and vibration problems to the structure of the draw bridge. As a result of the vibration damper, the harmful vibration of the bridge can be slowed down, and the structure of the bridge can be made lighter.

Vibration dampers known in the art are detachably mounted support structures or damper structures that are connected to the lash bridge and are also connected, for example, to the hatch cover. At the same time, they block or hinder the transportation of containers. Also known in the art is a vibration damper in which large masses can be displaced by different actuators at different points of the tensioning bridge (e.g., in the height direction) and at the same time the vibrational properties of the tensioning bridge can be varied. The vibration damping configuration of the prior art for the draw bridge is shown, for example, in the following Korean Patent Application: No. 20130134587A, No. 20130115633A, No. 20120113365A.

The solution in which the vibration damper is connected to the draw bridge and also for example to the hatch cover avoids loading the container to the considered location. At the same time, these solutions need to be installed and disassembled separately before and after use, as well as between operating states. When it comes to heavy-duty damper solutions, they will not be able to handle them successfully by hand, but instead require a crane or other auxiliary device. This slows down the use of the system and incurs additional costs. Systems provided with separate actuators (e.g., cylinders or motors) are in part complex, expensive, and prone to failure.

The object of the present invention is to achieve the problem without the above The pull bridge of the title. A draw bridge according to the invention is characterized in that at least one vibration damper is fastened to the pull bridge in a fixed or detachable manner, the vibration damper comprising a mass element via a flexible element and/or via a damping element Connect to the draw bridge.

A preferred embodiment of the vibration damper according to the invention is characterized in that the mass of the mass element is configured to vibrate due to the vibration effect of the bridge.

A second preferred embodiment of the vibration damper according to the invention is characterized in that the mass of the mass element is configured to vibrate in a different phase than the vibration of the tensioning bridge in a manner that limits the vibration of the bridge.

A further preferred embodiment of the vibration damper according to the invention is characterized in that the operation of the vibration damper is linear or non-linear, depending on the properties of the mass element, the flexible element, the damping element, ie the damping capacity extension To a narrow or wide range of vibration frequencies.

With the vibration damper according to the present invention, the tendency of the tension of the tension bridge can be reduced, and the tension bridge can be made lighter than before. The vibration damper is simple in construction, requires no maintenance, and is inexpensive to manufacture.

1‧‧‧Leather bridge

2‧‧‧Vibration damper

3‧‧‧Quality components

4‧‧‧damage element

5‧‧‧Flexible components

6‧‧‧ skeleton part

7‧‧‧Container/container stacking

8‧‧‧ pulling tie

m‧‧‧Quality

In the following, the invention will be described in more detail with the aid of certain preferred embodiments with reference to the accompanying drawings, in which: Figure 1 shows a draw bridge and a stack of containers, connected by two tie bars.

Figure 2 presents the draw bridge and container stack from the side, in a state where the vibration damper is connected to the draw bridge.

Figure 3 presents a draw bridge with three vibration dampers mounted thereon.

Figure 4 presents a schematic illustration of the functional components of the vibration damper.

The tie-down bridge 1 is typically arranged on the open deck of the cargo ship in the transverse direction of the ship, and the container/container stack 7 is arranged in the tie system in such a manner that the pull rod 8 of the container can be fixed between the container and the draw bridge. Between the bridges.

When a cargo ship sails on the sea, the ship's engine and propeller produce vibrations of the hull. This vibration acts like an excitation and generates vibration in the tensioning bridge 1. Figures 2 and 3 present the vibration damper 2 secured to the draw bridge. The vibration damper 2 is typically fastened to the top of the draw bridge, but may be other locations as well. When the tie-down bridge 1 vibrates at its natural frequency due to the excitation vibration effect from the ship structure, the mass of the vibration damper 2 starts to vibrate in different phases; in this case, the vibration of the bridge 1 cannot be at its rate and amplitude. Growing up to a harmful big.

Figure 4 presents in more detail a manner of implementing a vibration damper in accordance with the present invention. The vibration damper 2 comprises a mass element 3 which is connected to the skeleton portion 6 of the vibration damper 2 via a flexible element 5 and/or a damping element 4. The skeleton portion 6 is fixed (for example by welding) or The tie-down bridge 1 is fastened to the detachment (for example, with a bolt joint). Alternatively, the flexible element 5 or the damping element 4 or both may be directly fastened to the tie-down bridge 1.

The vibration damper 2, which may have one or more units, is fastened to a pull bridge. Incidentally, one vibration damper 2 may include a plurality of mass elements 3 and a flexible element 5 and/or a damping element 4.

The vibration of the mass element 3 of the vibration damper 2 is partly adjusted by the flexible element 5 and the damping element 4. Due to the vibration damper 2, the structure of the draw bridge 1 is less stressed and they can be made lighter.

The typical critical vibration frequency range of the pull bridge 1 is between 1 and 10 Hz. The operation of the vibration damper 2 can be adjusted to a specific critical frequency or a wider frequency band by adjusting the properties of the different members, such as the size of the mass element 3, the rigidity of the flexible element 5 and the damping element 4.

The mass element 3 in the vibration damper 2 can for example weigh between 100 and 1000 kg, which depends in particular on the vibration properties of the bridge 1 .

The function of the flexible element 5 may be linear, in which case the spring force is determined as a function of the compression (deformation) of the spring (e.g., a coil spring); or the function of the flexible element may be non-linear, in which case, for example The rate of compression (deformation) of the spring affects the amount of spring force.

The damping element 4 can for example be an impact absorber filled with a liquid or a gas. At the same time, the friction between the vibrating (moving) structure and the stationary structure can function as a damping factor.

The vibration damper 2 can also be free of the damping element 4 It is also possible to integrate the flexible element 5 and the damping element 4 into one functional component.

Rather than a coil spring, the flexible element 5 of the vibration damper 2 can be changed to an elastic rubber member, a flexible rod or some other element that allows vibration and deformation. It is also possible to use a flexible element 5 which has damping properties at the same time due to internal friction, for example in the structure.

It will be apparent to those skilled in the art that the present invention is not limited to the embodiments described above, but may vary within the scope of the claims presented below. For example, the nature and location of the vibration damper 2 can be optimized based on vibration analysis performed for each of the drawn bridge structures and the cargo ship. Incidentally, the properties of the vibration damper 2 can be changed by adjusting the rigidity of the elements 4, 5, the damping ability, and/or the weight of the mass element 3. The operation of the vibration damper 2 is linear or non-linear, depending on the nature of the mass element 3, the flexible element 4, and the damping element 5, that is, the damping capacity extends to a narrow or wide range of vibration frequencies.

Features that may be presented in the narrative in conjunction with other features may be used separately from each other if necessary.

2‧‧‧Vibration damper

3‧‧‧Quality components

4‧‧‧damage element

5‧‧‧Flexible components

6‧‧‧ skeleton part

m‧‧‧Quality

Claims (11)

A drawn bridge (1) of a cargo ship, which is directly or indirectly fixed to the hull structure of the cargo ship, the tie-type bridge being characterized in that at least one vibration damper (2) is fixed or detachable Fastened to the pull bridge (1), the vibration damper comprises a mass element (3) which is connected to the pull bridge (1) via a flexible element (5) and/or via a damping element (4). A pull bridge according to the first aspect of the patent application, wherein the mass of the mass element (3) is configured to vibrate due to the vibration effect of the draw bridge. The draw bridge of claim 2, wherein the mass of the mass element (3) is configured to vibrate in a different phase from the vibration of the draw bridge in a manner that limits vibration of the draw bridge. A pull bridge according to the first aspect of the patent application, wherein the operation of the vibration damper (2) is linear or non-linear, depending on the mass element (3), the flexible element (5), the damping element The nature of (4), that is, the damping capacity extends to a narrow or wide range of vibration frequencies. The pull bridge according to the first aspect of the patent application, wherein the function of the flexible element (5) is linear, that is, the spring force is determined as a function of compression or elongation of the spring. The pull bridge according to the first aspect of the patent application, wherein the function of the flexible member (5) is non-linear, that is, the deformation rate of the flexible member affects the magnitude of the spring force. According to the drawing bridge of claim 1, the vibration damper (2) comprises a plurality of mass elements (3) and flexible elements (5) and/or Or damping element (4). The pull bridge according to claim 1 of the patent application, wherein the properties and position of the vibration damper (2) are optimized based on vibration analysis performed for each of the pull bridge structures and the cargo ship. A pull bridge according to the first aspect of the patent application, wherein the properties of the vibration damper (2) can be varied by adjusting the rigidity of the elements, the damping capacity and/or the weight of the mass element (3). According to the drawing bridge of claim 1, the mass of the mass element (3) is between 100 and 1000 kg. A pull bridge according to any one of claims 1 to 10, wherein the damping element (4) is a shock absorber filled with a liquid or a gas.