JPS582114B2 - How to get started - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater cable injection hot water collection device for supplying power from an offshore support vessel to marine equipment such as submersibles, underwater habitat bases, underwater robots, submarine drilling equipment, etc. The purpose of this is to automatically repeat the operation of pulling the cable when the cable tension falls below a set value and freely letting it out when it exceeds the set value during power supply, without installing a cable tension detection device. It is to provide a structure that can be used.

FIG. 1 is a schematic front view showing how power is being supplied from a support ship 4 on the sea surface 3 to a submarine excavation device 2 traveling on the seabed 1 via an underwater cable 5. The electric power is connected to the winding device 7 via a generator 8,
It is supplied to the end of the underwater cable 5 in the winding device 7 via the cable 9 and the slip ring 10.

However, when the power supply system shown in FIG. 1 is adopted, the underwater cable 5 must be suspended with a predetermined tension.

If the underwater cable 5 becomes too loose, it will interfere with the work of the submarine drilling equipment 2, and if it becomes too tensioned, problems such as disconnection of the cable 5 and poor power supply will occur.

Furthermore, the support ship 4 is raised and lowered by the rise and fall of the sea surface 3 caused by waves, and may also be washed away, and on the other hand, the drilling equipment also moves on the seabed 1, so it is necessary to constantly operate the underwater cable 5 to feed out and take it back.

The following methods can be considered to carry out the above-mentioned feeding and pulling operations of the underwater cable 5.

That is, a tension and speed detection device 6C is arranged between the two sheaves 5a and 5b of the pulling device 6, and the underwater cable 5 in the seawater extends upward and first curves along the sheave 6a. to be able to detect the speed and tension of the

While checking the scale of this detection device 6c, the operator, for example, if the tension increases beyond the allowable range, drives the pulling device 6 in the direction of cable payout, or loosens the brake and lets out the cable freely, or if the tension is within the allowable range. This method drives the pulling device 6 in the cable pulling direction when the cable falls below the range.

However, the above method not only requires manpower, but also
Requires skill.

Therefore, in the present invention, the system is configured so that the cable take-up and feeding can be automated not only when the cable is initially put into the sea, but also after the power supply has started.
The following is an explanation in relation to the drawings.

FIG. 2 is a plan view (schematic diagram) of a cable inputting and retrieving device arranged on a ship, where 12 is a take-off device and 13 is a winding device.

In the pulling device 12, reference numeral 14 and 15 are multi-grooved sinibs that rotate in the same direction and are supported on the sheave bed 16 via bearing stands (not shown), and the underwater cable 17 extending upward from the sea surface is connected to the sheave It passes through the hole 18 of the bed 16 and is wrapped around the sheaves 14 and 15 multiple times, passes through the guide roller 19 and the traverse guide roller 20, and is wound around the cable drum 21 of the winding device 13, with one end being wrapped around the cable drum 21. It is secured and powered by the slip ring 22.

A unidirectional rotating prime mover 24 is installed to drive the sheaves 14 and 15.

The hydraulic pump 25 is driven by the prime mover 24, and pressurized hydraulic oil is supplied to the hydraulic motor 27 via a hydraulic controller 26.

This hydraulic motor 27 is, for example, a rotary type having rotary vanes, gears, or a trochoidal rotating body, and can be reversed by switching the supply direction of hydraulic oil, and when receiving a reverse driving force from the output shaft side, it can be used as a pump. It has the property of generating hydraulic pressure.

Reference numeral 28 denotes an emergency electromagnetic brake, which is connected to the output shaft of the hydraulic motor 27 and has a function of locking the sheaves 14 and 15 in the event of a power outage.

29 is a gear reducer, 30 is a group of reduction gears, 31 and 32 are ring gears integrated with the sheaves 14 and 15, and the final pinion 30a of the gear group 30 meshes with the sheaves 14 and 1.
5 are driven in the same direction.

In the winding device 13, 34 is a torque motor, 35 and 36 are transmission wheels, 37 is an electromagnetic brake, 38 is a belt, and 39 is a gear reducer. It is kept at a constant value by setting the voltage.

In the present invention, an underwater cable 17 that passes from the sheave 14 through the hole 18 of the sheave bed 16 and is suspended in seawater.
For example, during power supply, the hydraulic motor 27 always applies a constant torque in the hoisting direction to the sheave 14 to prevent the cable from loosening, and the hull rises. When the sheave 14 is reversely driven by the cable when it is blown or swept away, the cable 17 is paid out while applying a controlled brake to the cable 17 by the pumping action of the hydraulic motor 27.

FIG. 3 shows an example of a hydraulic circuit.

In Fig. 3, 41 is a check valve, and 42 is a '1st pressure control valve.This pressure control valve (release valve) 42 can manually change the set pressure, taking into consideration water depth, flow rate, etc. during power supply. It is set to a value that allows continuous application of torque in a predetermined pulling direction to the sheaves 14 and 15.

43 is a solenoid valve, 44 is a pressure oil supply path for cable pulling, 45
is a pressure oil supply path for cable input; when the solenoid valve 43 is in the position shown, the pressure oil that has passed through the check valve 41 is supplied to the hydraulic motor 27 through the oil path 44, and the motor 27 is pulled up by the cable. drive in the direction.

At that time, the oil passage 45 communicates with the tank 47 via the solenoid valve 43, the oil passage 51, and the solenoid valve 46.

Reference numeral 48 denotes a second pressure control valve, which, like the valve 42, allows manual adjustment of the set pressure (release start pressure).

This pressure control valve 48 is operated when the sheaves 14 and 15 are pulled by a cable in seawater and driven in reverse, and the rotation of the hydraulic motor 27 in the lifting direction is inhibited, or when the hydraulic motor 27 is driven in the opposite direction. The pressure in the passage 44 is controlled by the pressure control well 48.
When the set pressure is reached, oil is released to suppress the resistance to rotation of the hydraulic motor 27 in the cable feeding direction to below a certain value, and to keep the cable under a certain tension.

As a result, even if the cable is let out when the ship is rising or drifting, excessive tension beyond a certain tension will not be applied to the cable.

When the cable tension decreases, the oil pressure in the oil passage 44 decreases, and the motor 27 continues to apply a set torque in the cable pulling direction to the sheaves 14 and 15 using the oil pressure set by the first pressure control valve 42 described above.

Reference numeral 50 denotes a flow rate control valve, which has the function of preventing the cable from becoming lowered too quickly when lowering the underwater cable into seawater, such as when lowering a submarine drilling device from a support ship.

That is, when lowering the cable, the solenoid valve 43 is shifted upward to change the direction of rotation of the hydraulic motor 27, and the solenoid valve 46 is shifted downward to connect the oil passage 51 to the flow rate control valve 50, so that the rotation direction of the hydraulic motor 27 is changed. The released pressure oil is appropriately throttled, and in this way the rotational speed of the hydraulic motor 27 is kept within an allowable range.

When the solenoid valve 46 is shifted upward, the oil passage 51 is closed and the hydraulic motor 27 is locked.

As explained above, the present invention includes the prime mover 24 and the prime mover 2.
Hydraulic pump 25 driven by Hydraulic pump 4 and Hydraulic pump 2
a first pressure control valve 42 between the hydraulic pump 25 and the check valve 41; A rotation direction switching valve (electromagnetic valve 43) having an inlet connected to the side and having two outlets, a hydraulic motor 27 for driving the cable pulling device having two entrances and exits, and a rotation direction switching valve (
A cable pulling pressure oil supply path 44 connects one outlet of the solenoid valve 43) and one outlet of the hydraulic motor 27, and connects the other outlet of the rotation direction switching valve 43 and the other outlet of the hydraulic motor 27. The second pressure control valve 4 in the cable input pressure oil supply path 45 and the cable pull-up pressure oil supply path 44
8, the set pressure of the first pressure control valve 42 is lower than the set pressure of the second pressure control valve 48, and both of these set pressures are configured to keep the cable tension below the permissible cable tension. According to the present invention, a cable tension detection device is not required.
When the tension of the power-supplying cable falls below a set value, the cable is pulled out, and when the tension exceeds the set value, the cable is let out, which can be automatically repeated.

[Brief explanation of the drawing]

Figure 1 is a front view showing the power supply system for marine equipment, Figure 2
The figure is a plan view of the take-up device and winding device on the support ship, and FIG. 3 is a hydraulic circuit diagram. 25: Hydraulic pump, 41: Check valve, 42: First pressure control valve, 27: Hydraulic motor, 44: Pressure oil supply path for cable pulling, 45: Pressure oil supply path for cable input, 43: Solenoid valve ( (Example of rotational direction switching valve), 48: Second pressure control valve.

Claims (1)

[Claims] 1. A prime mover, a hydraulic pump driven by the prime mover, a check valve connected to the discharge side of the hydraulic pump and allowing flow only in the discharge direction of the hydraulic pump, and a first pressure control between the hydraulic pump and the check valve. A valve, a rotational direction switching valve having an inlet connected to the discharge side of the check valve and having two outlets, a hydraulic motor for driving a cable pulling device having two inlets and outlets, and one outlet of the rotational direction switching valve. A pressure oil supply path for cable pulling that connects one entrance and exit of the hydraulic motor, a pressure oil supply path for cable input that connects the other exit of the rotation direction switching valve and the other entrance and exit of the hydraulic motor, and a pressure oil supply path for cable pulling that connects the other exit of the rotation direction switching valve and the other entrance and exit of the hydraulic motor. a second pressure control valve in the pressure oil supply line, the set pressure of the first pressure control valve is lower than the set pressure of the second pressure control valve, and both set pressures reduce the cable pulling force to the cable. An underwater cable insertion and recovery device characterized by being configured to maintain a tensile force below an allowable tensile force.