JPS5822878Y2 - Cutting device for wrapped ropes on ships - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cutting device installed near the propeller of a ship to cut a rope or similar string-like member wound around the propeller shaft.

In general ships that use a propeller (screw) as a propulsion device, ropes such as fishing nets or similar string-like members (hereinafter collectively referred to as ropes) that exist or float in the sea are hooked to the propeller and attached to the propeller shaft. It may get wrapped around.

This wrapping of the rope not only reduces the propulsion force, but also inhibits lubrication on ships where the propeller shaft is lubricated with seawater, causing abnormal wear on the lignum vita and rubber bearings. It can also make navigation impossible.

Conventionally, as soon as a rope was wrapped around the propeller shaft, a sailor went into the sea and cut the wrapped rope. Depending on the conditions, cutting the rope can be very dangerous.

For this reason, a cutting blade is placed on the outer periphery of the propeller shaft to cut the rope using the winding force of the rope itself that wraps around the propeller shaft, or a rope guard is placed around the propeller shaft to cut the rope. The former method relies on the rope's own winding force to cut the rope, so the rope cannot be cut reliably; In many cases, the rope passes through the small gap between the rope guard and the propeller shaft and wraps around the propeller shaft, and neither is very perfect.

This invention was made in view of the above circumstances, and aims to provide a cutting device that can reliably cut the rope wound around the propeller shaft, has a simple structure, and is easy to implement.

This invention will be explained in detail below based on the drawings.

The drawing shows an embodiment of this invention, and 1 is a hull.

A propeller shaft 2 is supported on this hull 1 as usual,
A propeller 3 is attached to the outer end of the propeller shaft 2.

The rope guard 4 is also fixed to the hull 1, concentrically surrounding the propeller shaft 2, as is customary.

A flexible hollow body 5 made of rubber or an equivalent material is attached to the rope guide 4 with its outer circumferential surface fixed to the inner circumferential surface of the rope guard 4, and the inner end (inner circumferential portion) It is configured to be able to freely bulge out toward the propeller shaft 2.

This flexible hollow body 5 receives pressurized fluid from a pressure fluid supply source 6 through a connecting pipe 7, and bulges out toward the propeller shaft 2. A rope wrapped around the propeller shaft 2 is attached to the inner end of the flexible hollow body 5. It is provided with a cutting blade 9 for cutting 8.

In order to prevent the propeller shaft 2 from being damaged by the cutting blade 9, a protective sleeve 10 is attached to the outer peripheral surface of the propeller shaft 2.

Note that air is mainly used as the pressure fluid.

On the other hand, the inner surface of the rope guard 4 is provided with the flexible hollow body 5.
In addition to the above, a winding detection mechanism 11 for detecting winding of the rope 8 around the propeller shaft 2 is provided.

This detection mechanism 11 includes a piston 14 having a detection member 12 fixed to its outer end and a communication hole 13 opened in the inner end surface and body portion, and an inflow that is communicated with each other through the communication hole 13. The piston 14 has a hole 15 and an outflow hole 16.
It consists of a cylinder 11 into which a cylinder 11 is fitted so as to be freely retractable.

Here, the above-mentioned inflow hole 15 is always in communication with the communication hole 13,
Further, the outflow hole 16 is configured to communicate with the communication hole 13 as shown in FIG. 4 only when the piston 14 moves up as shown in FIG. 3 away from the propeller shaft 2.

The inflow hole 15 of the cylinder 17 is connected to a pump 19 such as a main engine cooling water pump via a connecting pipe 18, and the outflow hole 16 is connected to a pressure switch 21 via an alarm pipe 20.
has been contacted.

The pressure switch 21 is an F-ray device 2 such as a lamp or a bell.
2, and when the communication hole 13 communicates with the outflow hole 16 and fluid flows into the alarm pipe 20, it closes and activates the alarm device 22.

23 is an operating knob for opening and closing the connecting pipe 7, 24 is a stop valve for opening and closing the connecting pipe 18, and 25 is a bellows.

Next, the operation of the cutting device according to the invention constructed as described above will be explained.

The drawing shows the operating state of the vessel, in which the connecting pipe 1 is closed by the operating handle 23 and the stop valve 24 is opened, communicating the pump 19 with the cylinder 17.

Therefore, the flexible hollow body 5 is contracted to move the cutting blade 9 away from the protective sleeve 10, and conversely the piston 14 is lowered to bring the detection member 12 into light contact with the protective sleeve 10.

In this state, when the rope 8 enters the inside of the rope guard 4 through the gap between the propeller 23 and the rope guard 4 and wraps around the propeller shaft 2, the detection member 12 is pressed upward by the wrapped rope 8, and the piston 14 is raised to connect the communication hole 13 to the outflow hole 16 as shown in FIG. do.

In response to this action of the pressure switch 21, an alarm device 22 is activated to notify that the rope 8 is wrapped around the propeller shaft 2.

In this way, since the winding of the rope 8 is detected, immediately operate the handle 23 and pressurize the pressure fluid supply source 6.
is communicated with the flexible hollow body 5.

As a result, pressure fluid is forced into the flexible hollow body 5 and expands as shown by the two-dot chain line in FIG. 2, so that the cutting blade 9 moves toward the propeller shaft 2 and cuts the wrapped rope 8. .

The detection mechanism 11 can detect the cutting of this wrapped rope.

After the rope 8 wrapped around the propeller shaft 2 is cut by the above operation, the operating nodule 23 is closed to stop the supply of pressure fluid to the flexible hollow body 5, and at the same time, the flexible hollow body 5 is opened to the communication pipe 7 and the atmosphere to make it flexible. The internal pressure of the hollow body 5 is returned to normal pressure.

As a result, the flexible hollow body 5 is contracted, the cutting blade 9 is separated from the protective sleeve 10, and the flexible hollow body 5 returns to its old state.

The illustrated embodiment has a structure in which four cutting blades 9 are attached to the inner circumference of the annular flexible hollow body 5.
It is not limited to this.

The suspension rope guard 4 prevents the rope 8 from wrapping around the propeller shaft 2 as much as possible, and also serves to protect the flexible hollow body 5, so this equipment is very preferable. It is not necessarily necessary for the invention.

Furthermore, if necessary, the operation handle 23 can be replaced with an automatic on-off valve, and a pressure switch can be connected to the automatic on-off valve in addition to the alarm device 22, so that the rope can be cut automatically. .

As explained above, in the cutting device of this invention,
Since the cutting blade 9 is forcibly moved by the bulging action of the flexible hollow body 5 to cut the wrapped rope 8, it can be cut accurately.

Moreover, since the cutting blade 9 is configured to cut the wrapped rope by applying its cutting edge to the outer circumferential side of the wrapped rope where the degree of tension is high, the rope can be easily cut in this respect as well.

Furthermore, since the rope can be cut by remote control, there is no need for the sailor to go directly to the propeller to perform the cutting work, making the work extremely safe and easy.

Furthermore, the structure is simple, there are few failures, and it is easy to implement, making it extremely practical as a wound rope cutting device.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a longitudinal cross-sectional view of a cutting device according to this invention, Fig. 2 is a cross-sectional view of the same,
FIG. 3 is a sectional view of the detection mechanism in the closed state, and FIG. 4 is a sectional view of the main part of the detection mechanism in the communication state. 2... Propeller shaft, 5... Flexible hollow body, 6... Supply source, 9... Cutting blade.

Claims (1)

[Scope of utility model registration request] A flexible hollow body is provided on the outer periphery of the propeller shaft so as to be able to bulge out toward the propeller shaft, and a pressure fluid is sent to the flexible hollow body to inflate the flexible hollow body toward the propeller shaft. A fluid supply source is connected, and a cutting blade is attached to the inner end of the flexible hollow body to cut the rope wound around the propeller shaft by the expansion action of the flexible hollow body by pressure fluid. A device for cutting wrapped ropes on ships, characterized by: