JPS5940673B2 - Mud store door liquid tight device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mud hold door liquid-tight device for sealing a mud removal door attached to a mud hold of a dredger or the like.

FIG. 1 shows a schematic side view of a dredger equipped with a mud bay (hereinafter referred to as a hopper dredger), and FIG. 2 shows a schematic plan view of the lower part of the mud bay.

The hopper dredger once loads the dredged material into the mud hold 2 of the hull 1, and when the mud hold 2 is filled with the dredged material, it stops dredging and sails to the mud removal point, and uses the sludge valve installed at the bottom of the mud hold 2 or The mud removal door 4 is opened to drain the mud inside the mud storage to the outside of the ship.

When the mud removal is completed, the mud removal valve or the mud removal door 4 is closed to make the hull 1 liquid-tight.At this point, there is water in the mud hold 2 of the hull 1, and this water is pumped out of the vessel. The mud tank 2 is emptied, dredging is carried out further at the dredging site, and the above-mentioned operations are repeated.

In this way, in a hopper dredger, the sludge valve or sludge door 4
The structure of the tank and the structure of making the mud hold 2 of the hull 1 liquid-tight are important points for improving the work efficiency.

There are various structures for mud removal doors or mud removal valves, and the hinge type and conical valve type have conventionally been the mainstream, but these are not necessarily developed in Japan.

On the other hand, in Europe, in order to improve workability in shallow waters and prevent damage accidents when contacting the seabed, a sliding type door that does not protrude from the bottom of the ship has been developed instead of the hinge type and conical valve type that protrude downward from the bottom of the ship. Although it is equipped, there is no track record of this kind in our country.

To explain about this sliding door, which has no track record in Japan, 4 in Figures 1 and 2 is a sliding door, which is attached to the bottom of the mud hold 2 and moves horizontally in the front and rear directions by a hydraulic device 3. A sludge drainage hole provided at the bottom of the hold 2 is opened.

FIG. 3 is a central cross-sectional view of the hull.

Conventionally, the liquid-tight structure of this sliding door 4 is the fourth.
Is the liquid-tight gasket 5 shown in the figure used? This liquid-tight gasket 5 has (1) a structure in which it is always in contact with the sliding door 4, and (2) a structure in which it is in contact only when the sliding door 4 is stationary and released when it is in operation. There are two methods of construction.

In the former case, the liquid-tight gasket 5 is in contact even when the sliding door 4 is operated, and the liquid-tight gasket 5 is easily worn out due to friction with the sliding door 4 or dredged material, which is a serious disadvantage that the liquid-tightness cannot be maintained. This is not desirable.

There are various methods for the latter method, and a conventional method is shown in FIG.

That is, a hole is made in the fixing bolt 20 of the liquid-tight gasket 5 and a piping 15 is connected thereto, and compressed air is passed through the piping to inflate the liquid-tight gasket 5 and bring it into contact with the sliding door 4 to maintain liquid tightness. It is.

However, this conventional liquid-tight structure requires a compressor to feed compressed air to the liquid-tight packing 5, although it is not shown in FIG. Operate the compressor or store the compressed air in a separate container,
There is a drawback that it is necessary to supply compressed air by operating a valve or the like to make the contact liquid-tight.

It also has disadvantages, such as the need for very long piping to guide the compressed air.

The present invention aims to solve these drawbacks.
It has a variable pressure cylinder, a variable force cylinder, a valve, and a liquid-tight gasket, and the liquid pressure inside the liquid-tight gasket can be adjusted by simply opening and closing the valve using the water pressure at the bottom of the ship, without requiring any other driving source. A liquid-tight mud cargo door that makes the sliding door and the liquid-tight gasket contact or non-contact by changing the structure to make it liquid-tight or non-liquid-tight, making it easier to operate the sliding door and preventing the liquid-tight gasket from wearing out. The purpose is to provide equipment.

For this reason, the mud door liquid-tight device of the present invention is arranged around a mud removal door attached to a mud hold of a dredger, etc., and is expandable and contractible to make the mud removal door liquid-tight or release it. A liquid-tight packing device is equipped with an opening that communicates with the water outside the ship, and a pressurizing part provided on one side of the cylinder, a first piston that slides inside the cylinder, and an opening that communicates with the water outside the ship. A reduced pressure provided on the other side of the cylinder facing the pressurized part via the first piston, comprising an opening communicating through the first valve and a drain opening communicating with the drain pipe through the second valve. A variable force cylinder 1 consisting of a piston rod fixed to the first piston, disposed so as to pass through at least the pressurizing part, and moving within the variable force cylinder; A second piston driven by a rod with a smaller diameter than the piston rod fixed to the pressure side slides inside the cylinder, and the fluid injected into one side of the cylinder divided by the second piston is kept liquid-tight. It is characterized by comprising a variable pressure cylinder having an opening that communicates with the inside of the sealing packing for injecting and discharging liquid into the packing.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
6 to 9 are diagrams showing the mud-tight door liquid-tight device of the present invention, and show holes 23 for applying pressure to the liquid-tight packing 5 in the bottom 26 of the hull cavity, and holes 23 for applying pressure to the bottom 26 of the hull cavity, and holes 23 for applying pressure to the liquid-tight packing 5, and holes 23 for applying pressure to the bottom 26 of the hull cavity. A hole 24 is provided, and the piping 15 is connected to the opening 53 of the pressurizing section 21 and the opening 54 of the depressurizing section 22 of the variable force cylinder 11 provided in the same gap or another gap.

A first valve 17 is provided in the pipe 15 between the hole 24 for applying reduced pressure and the opening 54 of the variable force cylinder 11.

A separate pipe 15' is provided from the drain port 55 of the pressure reducing part 22 of the variable force cylinder 11 to the water storage tank 12 which has an atmosphere opening part provided in the above-mentioned space or another space, or has a hole in the ceiling.

A second valve 18 is provided in the middle of the separate pipe 15'.

The water storage tank 12 is equipped with a drainage pump or drainage pipe (
A piping 15'' communicating with the main body (not shown) is provided.

The water storage tank 12 is piped so that water can be drained from the drain port 55 of the pressure reduction part 22 of the variable force cylinder 11 into a ballast tank or other seawater close to atmospheric pressure.
This can be omitted if the structure is such that pressure greater than the water pressure outside the boat applied through the hole 24 is not applied to the opening of the depressurizing part 22 of 11.

A first piston 51 that slides inside the cylinder is provided between the pressurizing section 21 and the depressurizing section 22 of the variable force cylinder 11.

A piston rod 16 whose one end is fixed to a first piston 51 is provided to pass through the pressurizing section 21 side of the variable force cylinder 11, and a first piston rod 16 having a smaller diameter than the piston rod 16 is provided in the depressurizing section 22. A decompression side rod 14 whose one end is fixed to the piston 51 is provided coaxially with the piston rod 16.

In the vicinity of the variable force cylinder 11, a second piston 52 is disposed coaxially with the variable force cylinder 11 and is provided with a rod having the decompression side gland 14 as a common member, so that the second piston 52 slides inside the cylinder. A variable pressure cylinder 13 is provided.

An incompressible liquid 25 is sealed inside the variable pressure cylinder 13 via the second piston 52 to inflate or dent the liquid-tight gasket 5.

A pipe 15'' is provided between an opening 56 provided inside the variable pressure cylinder 13 and the inside of the liquid-tight packing 5 so that an incompressible liquid 25 can freely flow.

As shown in FIGS. 7 and 9, the liquid-tight gasket 5 is composed of a support plate 5a, a flexible membrane 5c, a holding plate 5b, and a bolt 5d, and has a structure that is made liquid-tight by the holding force of the pole 1-5d. .

In addition, the structure includes rollers 10 and guide plates 9 for facilitating the operation of the sliding door 4.

The pressure reduction side rod 14 in the configuration of the above-mentioned embodiment is not necessarily necessary.<The variable pressure cylinder 13 of the embodiment is moved to the left side of the variable force cylinder cylinder 11, and the piping 15 is lengthened, and the second piston 52 is connected to the piston rod. It can also be operated at 16.

The next question is about its operation. In the liquid-tight state shown in FIG. 6, first the first valve 17 is closed, and then the second valve 18 is opened.

As a result, the water pressure from the hole 23 made in the bottom of the ship is applied to the pressurizing part 21 of the variable force cylinder 11 through the opening 53 provided in the variable force cylinder 11, and the piston rod 16, the first piston 51, and the reduced pressure The side rod 14 is shifted to the right in the figure.

At this time, water on the reduced pressure side 22 is drained from the drain port 55 and collected in the water storage tank 12 through the pipe 15'.

The water in this water storage tank 12 is appropriately drained out of the ship using a drainage pump or a separately provided drainage device.

When the pressure reducing rod 14 moves to the right in the figure, the second piston 52 in the variable pressure cylinder 13 moves to the right in the figure, so that the incompressible liquid 2 sealed in the right side of the variable pressure cylinder 13
5 is fed into the liquid-tight packing 5 through the opening 56 and piping 15#, and the flexible membrane 5C is pressurized and bulges to contact the sliding door 4, making the mud hold 2 liquid-tight as shown in FIG. Keep it.

Next, FIG. 8 shows the operating state of the sliding door 4.

First, the second valve 1B is closed and the first valve 11 is opened.

As a result, equal water pressure is applied to both the pressure side 21 and the pressure reduction side 22 inside the variable force cylinder 11, but the pressure reduction side rod 1
Since the diameter of the piston rod 16 is made larger than the diameter of the piston 4, the force acting on the pressure reducing side 22 is greater, and the piston rod 16, the first piston 51, and the pressure reducing side rod 14 are shifted to the left in the figure.

When the pressure reducing rod 14 is shifted to the left in the figure, the incompressible liquid in the liquid-tight packing 5 is fed into the variable pressure cylinder 13, and the flexible membrane 5C is moved as shown in FIG. Dent, separate from sliding door 4.

As described above, according to the mud-tight door liquid-tight device of the present invention, the pressurizing part that opens to the bottom of the ship is provided on one side, and the valve is connected to the opposite side separated by the pressurizing part and the first piston. A variable force cylinder is provided with an opening in the bottom of the ship and a pressure reducing part switchably connected to a drain pipe close to atmospheric pressure; A variable pressure cylinder installed on the other side of the piston rod that penetrates the pressure section.The variable pressure cylinder uses an incompressible liquid built in the piston as a working medium, and a flexible membrane is used to transfer the working medium in the variable pressure cylinder. By using a simple device with piping that leads into the tank, (1) it is possible to easily make a mud hold liquid-tight or non-liquid-tight by simply opening and closing a valve.

(2) Since water pressure is used as the power source, only enough power is needed to drain the water in the water storage tank, and there is no need for a compressor or piping for compressed air as with conventional models.

(3) The valve can be operated by remote control and is easy to operate.

(4) To drain the liquid in the water storage tank, the dredger has a separate drainage pump, and if this pump is used, there is no need to install a new one.

It has the following advantages.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the hopper dredger, Fig. 2 is a schematic plan view of the hopper dredger, Fig. 3 is a schematic central cross-sectional view of the hopper dredger, and Fig. 4 is a sliding door and liquid-tight packing. FIG. 5 is a diagram showing the liquid-tight structure of a conventional sliding door. FIG. The figure shows the structure of the liquid-tight gasket (liquid-tight state) showing part ■ in Fig. 6, Fig. 8 shows the liquid-tight device for the mud bay door of the present invention (when the door is in operation), and Fig. 9 shows , is a diagram of the structure of the liquid-tight gasket (when the door is in operation) showing ■ in FIG. 8; 1... Hull, 2... Mud store, 3...
・・Hydraulic system (sliding door operating device), 4・・
...Sliding door (sludge removal door), 5...
...Liquid-tight gasket, 5a...Support plate, 5b.
...Press plate, 5c...Flexible membrane, 5d...
...Bolt, 6...Hopper inclined plate, 7.
...Structural fixing device, 8...Guide plate, 9
...Guide plate, 10...Roll, 11.
...Variable force cylinder 112...Water tank, 13...Variable pressure cylinder, 14...
Decompression side rod, 15, 15', 15", 15/1...
... Piping, 16 ... Piston rod, 17
...First valve, 18...Second valve, 19...Support plate, 20...Bolt for compressed air supply and liquid-tight Packing fixing bolt, 21
... Pressure section, 22... Pressure reduction section, 23.
...Bottom hole for pressurization, 24...Bottom hole for depressurization, 25...Incompressible liquid, 26...
・Bottom, 51...First piston, 52...
...Second piston, 53... Pressure part opening,
54... Pressure reduction part frontage, 55... Drain port, 56... Variable pressure cylinder opening.

Claims (1)

[Claims] 1 In the liquid-tight device of the liquid-tight gasket, which is installed around the mud removal door attached to the mud hold of a dredger, etc., and is expandable and contractable to make or release the mud removal door, A pressurizing part provided on one side of the cylinder, a first piston sliding inside the cylinder, an opening communicating with water outside the vessel through a first valve, and a drain pipe. A variable force cylinder 1 is fixed to the first piston and has a drain port communicating with the second valve, and is composed of a pressurizing part via the first piston and a pressure reducing part provided on the other side of the cylinder, facing the pressure part. a piston rod that is arranged to pass through at least the pressurizing part and moves within the variable force cylinder, and a rod that is smaller in diameter than the piston rod that is fixed to the pressurizing side of the first piston when the first piston is actuated. The driven second piston slides inside the cylinder, and the fluid injected into one side of the cylinder partitioned by the second piston is injected into the liquid-tight packing and discharged into the liquid-tight packing. A liquid-tight device for a mud cargo door, characterized by comprising a variable pressure cylinder with a communicating sliding opening.