JPS60352Y2 - Anti-friction device for impact plates for fenders - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in impact plates for fenders, and in particular to an anti-friction device for preventing peeling of paint on a ship's hull and damage to the impact plates themselves due to contact with the impact plates. .

Today, fenders made of com in various shapes are installed on the quay walls of ports and shipyards in order to prevent damage to the hull and quay walls caused by impacts when a ship approaches the berth.

In order to reduce the contact pressure per unit area with the ship's hull as much as possible, these anti-glare materials are equipped with a protective member called a receiving plate on the impact receiving surface of the fender. Furthermore, a plastic pad made of polyethylene, polyamide, tetrafluoroethylene, etc., or a comb elastic pad is attached to the surface of the impact plate in order to prevent damage to the hull itself and the impact plate due to friction with the hull. .

However, even with this method, the hull of a ship moored in a dock for a long time, especially for ant control, is constantly rocked by waves until the work is completed, and the surface of the impact plate of the fender is affected. As a result, the surface of the impact plate is subject to strong friction and wear damage due to deposits such as rust, dirt, and shells on the hull, as well as protrusions such as rivets 1 and weld lines. The parts also suffer damage such as peeling of the paint on the surface.

Conventionally, when berthed for a long period for purposes such as ant control, water spray pipes were attached to the top of the impact board as shown in Figure 3, and water was constantly sprayed towards the hull. Most of the water flowing down wastefully flows down along the periphery of the impact plate, making it impossible to form a sufficient water film between the hull and the surface of the impact plate. It's not showing its full potential.

On the other hand, pads made from combs are prone to tearing and abrasion damage due to the abrasion caused by the protrusions mentioned above due to the large frictional resistance and flexibility unique to combs, so recently they have been replaced with plastic pads. This is the reality.

However, according to the study results of the present inventors, even if the pad is made from Com, it is important to appropriately select the hardness of the rubber used.
And by adding appropriate auxiliary means, the above-mentioned drawbacks can be overcome, and furthermore, when the surface gets wet,
It was found that even better anti-friction effects could be exhibited.

The present invention provides a solution to the problem of preventing damage to the impact board pads caused by friction with the hull above, and as a means to achieve this, the impact board pads are constructed of a hard rubber elastic material. In addition, the main feature is that the bat is movably attached to the impact plate body via a cushion body made of a softer rubber elastic body.

The pad is made of natural rubber, styrene-butadiene copolymer comb, polybutadiene rubber, ethylene-propylene copolymer or ternary copolymer rubber, urethane comb or other suitable synthetic rubber, but especially after vulcanization molding. J in
It is made of a hard comb elastic body having an IS hardness of 80 or more (Shore A), preferably 85 or more.

As a result, among the factors that cause frictional force on the rubber surface, at least adhesive friction (which acts in proportion to the actual contact area) can be significantly reduced, and damage to the hull can be prevented.

However, the hard comb on the mole is much softer than conventional plastic pads and retains a small amount of rubber elasticity, so it works in conjunction with the cushion layer described below to prevent hull paint from being scratched. I am trying my best to prevent it from peeling off.

According to the present invention, the upper hard comb pad is movably attached to the impact plate main body via a cushion body made of a comb elastic material that is softer than the comb material of the pad, preferably sufficiently soft.

The cushion layer may be made of soft solid rubber having a JIS hardness of about 65, or may be made of rubber foam.

As shown in FIG. 1, the hard rubber pad attached to the impact plate main body via this cushion body moves backward according to the unevenness of the hull as the cushion body deforms.

Therefore, it is possible to completely prevent an inconvenient situation in which the pad is locally subjected to strong stress concentration due to a protrusion of the hull, and crack damage occurs in that area.

When the present invention is put into practice, the pad is made of a hard comb elastic body as described above, and small holes are bored in the pad and the cushion body as shown in the illustrated example in FIG. By facing the nozzle of the hose and forming a water film over the entire surface of the pad during use, it is possible to more effectively prevent damage to the pad itself from tearing and cracking, as well as peeling off the paint on the hull.

Examples of the present invention will be described below.

FIG. 1 is a sectional view of a main part of a fender to which the anti-friction device of the present invention is applied.

Similar to the embodiment shown in FIG. 2, this embodiment of the fender system consists of a pair of rubber fenders 1, 1 and an impact receiving plate 2 fixed to the front portions of these fenders 1, 1.

On the front surface of the impact receiving plate 2, there are many unit hard com pads 3...
are respectively attached via cushion bodies 4 made of a rubber elastic material softer than the pad 3.

The hard rubber pad 3 is made of styrene-butadiene copolymer rubber, and has a JIS hardness of 85.

The cushion body 4 is made of a blend of natural rubber and styrene-butadiene copolymer comb, and has a JIS hardness of 65.

Each pad 3 is constructed by inserting a bolt 6 into through holes 3a and 4a that are slightly larger than the bolt diameter in the pad and each cushion body 4, and then tightening the tip of the bolt 6 with a nut 6a through a rubber washer 5. By being fixed to the upper plate 2a of the impact receiving plate 2, it is movably attached to the impact receiving plate 2.

FIG. 2 is a sectional view showing another embodiment of the present invention, in which a small hole 7 is bored in the center of each hard rubber pad 3, and the tip of the water nozzle 8 is exposed into the small hole 7. This is the same as the previous example except for the following points.

The water nozzle 8 is attached to a water pipe 9 piped to the back side of the upper plate 2a of the impact receiving plate, while the water pipe 9 is connected to a rubber hose 1.
0 to a high-pressure water pump (not shown).

In this example device, if high-pressure seawater is spouted from the nozzle 8 as necessary, a water film is evenly formed on the surface of each hard comb pad 3. This combination further reduces the coefficient of friction.

Incidentally, in a case where the coefficient of friction when dry is about 0.5, when it is wet, it decreases to about 0.1 to 0.05.

As described above, according to the present invention, problems caused by friction between the impact plate of the fender and the ship's hull are completely resolved, and peeling of paint on the ship's hull, occurrence of cracks and wear and tear are significantly reduced, etc.
It has great value in terms of fender equipment.

[Brief explanation of the drawing]

1 and 2 are a partial sectional view showing the structure of an embodiment of the present invention and a sectional view of the entire device, and FIG. 3 is a side view of the conventional device. 1: Comb fender, 2: Impact plate, 2a: Upper plate of 2, 3: Hard rubber pad, 3a: Mounting hole of 3, 4: Cushion body, 4a: Mounting hole of 4, 5: Comb washer , 6: Port, 6a: Nut, 7: Small hole, 8: Water nozzle, 9: Water distribution V, 10: Rubber hose.

Claims (2)

[Scope of utility model registration request] (1) A shock absorber for fenders characterized in that a hard rubber pad with a JIS hardness of 80 or higher is movably attached to the front surface of the shock absorber plate via a cushion body made of a rubber elastic body softer than the pad. Plate antifriction device. (2) Punch a small hole in the hard comb pad and cushion body,
The anti-friction device according to claim 1, wherein a nozzle of a high-pressure water hose faces the small hole.