JPS6224570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-friction device for a fender, and more specifically, to an anti-friction device for a fender, and more specifically, to remove paint from a ship's hull due to friction with the impact receiving surface of a fender mainly made of rubber fender. The present invention relates to an antifriction device for fenders that can effectively prevent damage to the impact receiving surface.

Today, each port or shipyard has a V-shaped, π
Many types of fenders, such as H-type and H-type, are used to prevent damage to the ship's hull and quay due to the impact of the ship's approach. At the tip of these fenders, a protective member called an impact plate is often attached to the front surface of a plastic plate made of polyethylene, polyamide, polyacetal, etc., to disperse stress when berthed. At the same time, consideration is being given to preventing damage to the hull due to friction. However, even with this method, the upper plastic protection plate is subject to strong abrasion due to rust, dirt, shells, and other accretions present on the hull, and welding lines, causing it to wear out or break within a short period of time. Easy to do. If the protection plate is damaged, not only the ship's body that comes into contact with it, but also the impact plate itself, and even the rear fender itself are susceptible to damage.

As mentioned above, damage to the surface of the impact plate due to the strong abrasive action that occurs when a ship approaches the berth is an unavoidable problem, and up until now there has been no active countermeasure against this problem. The only solution was to frequently replace the front plastic panel. The present invention attempts to provide a technical solution to this problem.

The essence of the present invention is to reduce the frictional force between the hull and impact time by utilizing the anti-friction effect of water. For this reason, in the present invention, water such as fresh water or seawater is injected onto the hull that is to come into contact with the impact plate immediately before berthing. Although it is best to use fresh water as water, it is actually advantageous to use seawater that has passed through a strainer. Incidentally, if you are only looking for a friction-reducing effect, there are anti-friction agents that are superior to water, such as silicone oil, mineral oil, and fats and oils, but the inventors have decided not to use these materials due to the possibility of harbor pollution and fire. I don't like using it. Incidentally, it is preferable that the surface of the impact receiving plate is also wetted, and for this purpose, it is advantageous to use a polyamide plate or hard rubber having a relatively hydrophilic surface as the plastic plate.

The jet of water is applied to the ship's hull from a suitable location on the quay or quay face, but is usually radial from each fender location with an included angle and an elevation angle along the horizontal and vertical planes. . The water poured into the hull flows down rapidly due to gravity, so when spraying water, the nozzle should be opened so that a sufficient amount of water is present in the part of the hull that will come into contact with the impact board surface when berthed. Preferably, an angle and an elevation angle are defined. Furthermore, if necessary, two distance measuring devices detect the distance from the nozzle to the hull, approach speed and approach angle,
It can also be designed to take into account other data such as wind direction and speed to provide desired signals to a computer that controls the nozzle's horizontal angle, elevation angle, injection pressure, water volume, spray time, etc.

The distance from the nozzle to the hull can be arbitrarily measured by, for example, a measuring means that uses a laser beam, infrared ultrasound, or the like. However, a laser distance measuring device that utilizes the Doppler effect of a laser beam is most preferable because it provides accurate distance measurement to a target.

According to the present invention, the plastic plate (plastic pad) on the front side of the fender contacting part of the hull and the impact plate
A water film is formed between the two. This water film fills in concave parts such as peeled parts of paint, depressions, and various marks existing on both the hull and the pad, and at the same time is strongly compressed between the interfaces between the two. However, since the compressibility of water is extremely small, the distance between them will hardly decrease, so the hull and pad will essentially come into contact with each other through a film of water, which will significantly reduce the frictional force between them. death,
Therefore, direct damage to both the hull and pad due to friction is greatly reduced, and the fender itself is no longer exposed to severe shearing force, which has the effect of increasing the service life of the fender. can get. As is well known, there is a correlation between the shock absorption capacity of fenders and the reaction force, so when a small or medium-sized ship comes into contact with a large fender, it will receive an excessive reaction force. Small-sized fenders have appropriate cushioning properties for small and medium-sized ships, while also being able to protect large ships from excessive loads due to their low coefficient of friction. It also has a great advantage in that it can be generalized.

Preferably, after the water discharge from the nozzle is automatically started as described above, it is also stopped automatically. Examples of means for this purpose include a timer that automatically operates when water starts being discharged, and a pressure switch attached to the fender. When using a pressure switch, the sensor part of this switch is buried, for example, inside the fender body, and the decrease in pressure caused by contact with the ship's hull turns the switch ``off''.
configured to operate. In addition, deformation of the fender due to contact with the hull may actuate the limit switch. In this case, a plurality of switches should be provided in parallel depending on the various deformations of the fender. Embodiments of the invention will be described below with reference to the drawings, but these are, of course, illustrative and do not limit the technical scope of the invention.

FIG. 1 is a side view taken along a vertical plane perpendicular to a quay surface, showing an example of the anti-friction device for a fender according to the present invention, and FIG. 2 is a plan view of the same.

The rubber main body of the fender 1 is fixed to the front surface 3a of the quay 3, and a steel frame 4 with a plastic plate 5 pasted on the surface is integrally attached to the front surface of the main body, and the impact receiving plate 1 is attached to the front surface of the main body. Configure. The nozzle 6 is fixed to the upper surface of the steel frame 4 via a fixture 8, and its rear part is connected to a rubber water conduit (rubber hose) 7. Note that the front end of the nozzle is located slightly inside the front surface 3a of the steel frame 4.

The rear part of the rubber hose 7 following the nozzle 6 is connected to a seawater pump (not shown), and the pump is activated based on a signal from the laser rangefinder 9 described later to pump high-pressure seawater from the tip of the nozzle 6. Spouts water in an almost conical shape. At this time, some of the seawater drips from the surface of the nozzle 6 and wets the surface of the plastic pad 5. However, if necessary, direct injection may be performed onto the pad surface using a main pipe separate from the hose 7 or a branch pipe branching from the hose.

The laser rangefinder 9 is fixed on the upper surface 3a of the quay, detects an approaching ship, and sends an operation start signal to the pump when it approaches a certain distance (for example, 5 m) from the quay. Therefore, FIG. 3 schematically shows the antifriction device of the present invention, in which a signal when the ship S approaches a certain distance from the laser range finder 9 connects the switch 11 to the pump P via the amplifier 10, and connects the switch 11 to the pump P. As a result, seawater W passes through the hose 7 and is injected from the nozzle 6 toward the hull.

As described above, when high-pressure water is jetted toward the hull from the nozzle 6, the cleaning action washes away dust, sand, marine life, etc. adhering to the hull, and at the same time, the plastic pad itself is also wetted, so that the impact-receiving plate is /Friction between the hulls is drastically reduced, and as a result,
The hull, plastic pads and fender body are protected from damage.

FIG. 4 is a partially cutaway side view showing an example of a nozzle device for wetting the front surface of the impact receiving plate 1. FIG.
In this case, a perforated pipe 12 is installed in the steel frame 4 parallel to the steel frame 4 separately from the nozzle 6 for discharging water onto the hull surface, and water is passed through the perforated pipe 12 so that the water spouted from the hole is Then, wet the front surface of the impact receiving plate 1. In this example, the corners of the upper surface of the steel frame 4 are sloped in order to smooth the flow of the ejected water.

FIG. 5 is a side view showing another example of a nozzle for wetting the front surface of the impact receiving plate 1. FIG. In this example, a rotatable arm 13 is attached to the upper part of the steel frame 4, and the free end of this arm is connected to the nozzle 6. When wetting the front of fender 1,
When the arm 13 is folded down to direct the nozzle 6 toward the front of the fender 1 and water is sprayed, and when water is sprayed onto the hull surface, the arm 13 is raised to direct the nozzle 6 toward the hull. In this example, before the ship approaches, the arm 13 is tilted in advance to spray water onto the front of the impact plate 1, and when the ship approaches, the arm 13 is raised and the nozzle 6 is sprayed.
water in the direction of the ship's hull. By the way, arm 13
Raising and lowering is done fully automatically based on signals from the rangefinder.

Since the anti-friction device for fenders of the present invention has the above-described configuration, it wets the hull surface and the front surface of the impact plate with water before the hull berths, and at the same time wets the hull surface and the front surface of the impact plate with water, and at the same time removes dust, dirt and sand that adhere to the hull surface. By washing away marine organisms, etc., the frictional force between the impact surface and the hull is minimized, and this reduces the friction between the hull surface, the impact plate, and/or the hull.
Alternatively, it can prevent damage to fenders and expand the scope of application of similar fenders, which has the effect of bringing about great improvements in port facilities.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the anti-friction device for fenders of the present invention, FIG. 2 is a plan view of the anti-friction device for fenders shown in FIG. 1, and FIG. FIG. 4 and FIG. 5 are side views showing examples of nozzles for separately wetting the front surface of the impact plate. 1: Impact board, 2: Fender wood, 3: Quay, 4:
Steel frame, 5: Plastic pad, 6: Nozzle,
7: Water pipe (rubber hose), 8: Hose fitting,
9: Laser rangefinder, 10: Amplifier, 11: Switch, 12: Perforated tube, 13: Arm, P: Pump,
S: hull, W: seawater.

Claims (1)

[Scope of Claims] 1. A water discharge pipe provided at the upper part of a fender mainly made of rubber fender, and an automatic distance measuring device provided at an appropriate location of the fender; The water pipe operates in response to a signal emitted by the distance measuring device when a ship attempting to berth approaches a certain distance from the fender, and comparatively flows fresh water or seawater onto the ship's hull surface and the receiving surface of the fender. An anti-friction device for a fender, characterized in that it is configured to inject at low pressure. 2. The anti-friction device for a fender according to claim 1, wherein the water discharge operation from the water discharge pipe is automatically stopped when the ship berths or immediately before the berth is completed.