JPS5827160B2 - High Line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a by-line offshore replenishment system used to transport supplies such as oil from ship to ship at sea.

Generally, when transporting goods such as oil from ship to ship at sea, a thick rope called a byline is erected between the supply ship and the receiving ship, and a refueling hose or goods loading trolley is hung from this rope so that it can slide freely. Lower it.

The refueling hose or trolley is then positioned or transported by a cable provided along the by-line.

Incidentally, the mutual distance between the supply ship and the receiving ship is not always constant, but varies greatly due to ship body movements such as rolling and pitching.

For this reason, it is particularly necessary to adjust the rope to be let out and wound up in order to always maintain the byline at a substantially constant height.

In the by-line offshore replenishment system of the present invention, an automatic buffer type winch is provided at the end of the by-line rope, thereby automatically adjusting the length of the rope. This will be explained in detail with reference to the drawings showing this.

In FIG. 1, a supply ship 1 and a receiving ship 2 each have struts 3 and 4 erected on their decks, and a rope 5 forming a byline is installed between the struts 3 and 4.

Several hose suspension pulleys 6 and 7, which are slidably suspended from the rope 5, are coupled to the respective tip edges of the respective cables 8 and 9 constructed along the rope 5, and Along with the adjustment of the feeding amount of steps 8 and 9, the hanging posture of the refueling hose 10 is adjusted.

One end of the rope 5 is fixed to the support 4 of the receiving ship 2, and the other end of the rope 5 is wound around a winch drum 12 through a pulley 11 of the support 3 of the supply ship 1, and the winch drum 12 is directly connected to this. Together with the rotary hydraulic motor 13 and its hydraulic circuit, an automatic damping winch is formed.

In addition, a hydraulic motor 13, a servo pump 14, an electric motor 1
5. The hydraulic circuit system consisting of the throttle valve 16, the accumulator 17, the pressure gauge 18 with electric contacts, etc. will be described later.

When constructing a byline, first, the supply ship 1 and the receiving ship 2 approach each other, and the former passes the byline rope 5 to the latter.

At this time, in the relay circuit, as shown in the figure, the switch 19 connected to the power source is in an open state, the contacts 21 of the relay 20 are open, and the contacts 22 are closed.

For this reason, the servo amplifier 23 that changes the oil discharge amount of the servo pump 14 is connected to a manual setting device 24 consisting of a potentiometer via a contact 22, and the setting device 24 is connected to a positive (or negative) setting range. If set to
The signal is amplified by the servo amplifier 23, and the oil discharge direction of the servo pump 14 becomes positive (or negative).

That is, for example, when the input signal is set to +1■, the servo pump 14 discharges oil at an oil discharge rate of 1001 per minute.
The winch drum 12 is rotated in the rope hoisting direction via the hydraulic motor 13, and when the input signal is set to 11, the winch drum 12 is rotated via the hydraulic motor 13 at an oil discharge rate of 100 l/min. 12 in the rope payout direction.

Therefore, the operator can control the winch drum 12 with positive and negative variable speeds using the manual setting device 24.

As described above, the manual setting device 24 is set to the negative setting range, and the rope 5 is let out from the winch drum 12.
And after lashing one end of it to the support 4 of the recipient ship 2,
When the manual setting device 24 is set in the positive setting range, the winch drum 12 rotates in the rope winding direction, and the excess portion of the rope 5 that is let out is collected by the winch drum 12.

Now, in the process of recovering the rope, when the power switch 19 of the relay circuit is closed and the switch 25 is in the open state, the accumulator 17 connected to the high pressure side of the hydraulic circuit via the throttle valve 16 has its internal pressure reduced. It is constantly detected by a pressure gauge 18 with an electric contact, and when the pressure gauge 18 reaches a preset pressure of the output circuit of the servo pump 14, for example 140 kg/crrt, the pressure gauge 18 senses this and closes the electric contact 26. .

Therefore, relay 27 connected to electrical contact 26 is energized and its contact 28 is closed.

On the other hand, since the contact 30 of the non-energized relay 29 is closed, the relay 20 is energized by the closure of the contact 28, its contact 2L31 is closed, and the contact 22 is opened.

Since the contact 31 is for self-holding, it maintains this state until the contact 30 opens.

Therefore, by opening the contact 22, the manual setting device 24 is not input to the servo amplifier 23, and instead, the presetting setting device 32 is connected to the servo amplifier 23 via the contact 21.

In other words, as the surplus amount of the rope 5 is recovered,
The accumulator 17 is filled with hydraulic oil, its internal pressure rises, and the tension of the byline rope 5 increases, so that the manual setting device 24 is automatically switched to the presetting setting device 32, and the servo The pump 14 continues to discharge a preset small amount of oil by the preset setting device 32.

However, the small amount of oil is sufficient to exceed the amount of oil leaking from the servo pump 14, hydraulic motor 13, valves, etc., and the rope is maintained in a stretched state.

Note that the relay 29 is not energized unless the contact 25 is closed, and when the contact 25 is closed and the relay 29 is energized, the contact 30 connected in series to the relay 20 is opened.
The reloo circuit returns to the state shown.

The automatic buffer winch with this configuration and function is
When the supply ship 1 and the receiving ship 2 cause a relative movement, an automatic buffering operation is performed in which the byline rope 5 is automatically let out or wound up.

In other words, when the distance between the two ships changes in the direction of a dog, a force acts on the buffer type winch to force it to reverse, and most of the oil discharged from the servo pump 14 flows into the tank through the IJ valve. will return to.

Also, when the distance between the two ships changes in the direction of decreasing,
An amount equivalent to the deflection of the rope 5 is wound up at high speed by the buffer type winch.

In addition, if a large capacity accumulator 17 is used, the change in the internal pressure of the accumulator due to winding up a rope portion of 20 ropes will decrease from about 150 kg/cril to about 130 kg/cTL, and this will depend on the setting. This amount of change is not a problem in terms of tension.

Since the winch drum 12 and the hydraulic motor 13 are directly connected to each other, the moment of inertia when the rope 5 moves in and out is very small.

Therefore, there is no risk that an abnormally large tension will be applied to the rope 5 due to the acceleration caused by the movement of the rope 5 in and out.

The throttle valve 16 functions to damp the forced vibration of the rope 5 that occurs due to the movement between two ships.

Next, FIG. 2 shows a two-stage switching type hydraulic circuit system for high speed and low speed.

The throttle valve 16 supplies oil from the accumulator 17 to the hydraulic motor 13 when winding up the by-line rope 5 and limits the flow rate of the hydraulic oil, and conversely allows the flow to the accumulator 17 when the rope 5 is let out. It has the function of

Then, when the byline rope 5 is let out and one end thereof is secured to the support column 4 on the side of the receiving ship 2, the solenoid valve 33 connected to the high pressure hydraulic circuit is held in a de-energized state, so that the end Approximately 13 kg/- of replenishment oil sent from the 34 side energizes the low speed block 36 of the speed switching valve 35.

On the other hand, about 30 kg/Cr fed through the end portion 37
? The oil for controlling the servo pump L passes through the servo pump 14, which is reversed by the negative range setting of the 16 manual setting device 24, and flows into the end 38 of the hydraulic motor 13 through the low pressure hydraulic circuit. The byline rope 5 is connected directly to the winch drum 12.
Let it come out.

At this time, since the solenoid valves 39 and 40 are energized, the high pressure relief valve 41 is relieved at approximately 20 kg/cTL, which is the set pressure of the relief valve 41'.

Furthermore, although the pilot check valve 42 is conductive, it is true that hydraulic pressure flows into the accumulator 17 because the sealing pressure of the accumulator 17 is about 70 kg/- compared to the circuit pressure of about 20 kg/ffl. Nothing better.

When the lashing is completed, the manual setting device 24 is set to the positive setting range, and the servo pump 14 is rotated in the normal direction.

The hydraulic pressure sent from the end 37 is transmitted to the low speed block 36.
Hydraulic motor 1 through speed switching valve 35 energized by
3, the hydraulic motor 13 rotates the winch drum 12 forward at low speed and low horsepower, and the excess part of the byline rope 5 is wound around the winch drum 12. To go.

As a result, the byline rope 5 is stretched with low tension, and during this stretching process, the solenoid valve 39.
40 is released, and the positive range setting by the manual setting device 24 is switched to full speed.

As a result, the circuit pressure set value by the high pressure relief valve 41 increases to approximately 150 kg/i, while the pilot check valve 42 becomes bidirectional, the discharge hydraulic pressure of the servo pump 14 flows into the accumulator 17, and the byline rope 5 is stretched with high tension.

The throttle valves 1 and 6 damp the low frequency secondary resonance caused by the oil supply hose and the like.

When the circuit pressure reaches approximately 140 ky/ffl, the electrical contacts 26 of the pressure detector 18 are switched, as described above.
The manual setting device 24 is switched to the presetting setting device 32.

A constant tension is subsequently applied to the byline rope 5, and the oil discharge amount of the servo pump 14 is reduced to the preset value of the preset setting device 32.

In such a rope tensioned state, when the distance between the two ships begins to change in the direction of a dog, a force is forcibly applied to the hydraulic motor 13 from the by-line side in the direction of reversing the distance, and the circuit pressure increases. Rise.

Then, hydraulic pressure begins to flow into the accumulator 17, but because of the presence of the throttle valve 16, the flow rate is regulated by the difference between the circuit pressure and the internal pressure of the accumulator 17.

When the circuit pressure exceeds approximately 150 kg/cyit,
The set pressure is 150ky/ffl, which overcomes the IJ IJ- valve 41 and escapes to the low pressure circuit side through the check valve 45, and most of the IJ-
It returns to the oil tank 48 through the valve 47.

At this time, the right block 49 of the flushing valve 46 is energized by its pilot pressure.

In such a state, when the distance between the two ships changes in the direction of decreasing, the internal pressure of the accumulator 17 at this time is approximately 140 kg/CTL or more, so the driving pressure of the hydraulic motor 13 is reduced by the throttle valve 16. Only the flow rate regulated by the differential pressure caused by this is supplied to the high-pressure pipe.

Next, when the oil replenishment work using the refueling hose 10 is completed, the refueling hose 10 is first taken into the supply ship 1 side, and then the solenoid valve 39 is energized to increase the circuit pressure to approximately 20 kg/-.
Reduce to low pressure.

After untying the rope on the receiving ship side, the switch 25 shown in FIG.
is energized and the byline rope 5 is winched at high speed.
It is wound onto the drum 12.

It should be noted that the brake connected to the end 34 of the hydraulic motor 13 (shown above the hydraulic motor 13 in FIG. 2) is for actuation during the winch stop period.

As described above, according to the by-line type offshore replenishment system of the present invention, a highly efficient and compact buffer winch with the same functions as a ram cylinder type shock absorber can be obtained without using a hydraulic cylinder. Erection and maintenance can be performed satisfactorily.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration and usage of an embodiment of a by-line offshore replenishment system of the present invention, and FIG. 2 is a hydraulic circuit diagram of the system. 5... Rope for byline, 10...
Refueling hose, 12... Winch drum, 13
... Hydraulic motor, 14 ... Servo pump, 16 ... Throttle valve, 17 ...
・Accumulator, 18...Pressure gauge, 23・
... Servo amplifier, 24 ... Manual setting machine, 32 ... Preset setting machine, 35 ...
...Speed switching valve.

Claims (1)

[Claims] 1 The supply ship is equipped with a winch drum that lets out and winds up the byline rope between the supply ship and the receiving ship, and a hydraulic motor is directly connected to this winch drum, and the hydraulic motor and servo pump are connected to each other by hydraulic pressure. An accumulator is connected to the high pressure side of the coupled hydraulic circuit via a throttle valve to form a buffer type winch, and the servo amplifier that changes the oil discharge amount of the servo pump is closed when the rope is installed. A manual setting device consisting of a potentiometer is connected via a closed contact, and a presetting setting device is connected to the servo pump via an open contact that is open when the rope is installed. A by-line offshore replenishment device, characterized in that the closing contact and the opening contact are opened and closed in conjunction with each other.