JPH0130720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid handling device used, for example, to unload oil from an oil tanker docked at a sea berth to an onshore storage tank, or to load oil from a storage tank to an oil tanker. .

Conventionally, this type of fluid handling equipment has an inboard arm attached to the riser pipe that can be rotated vertically by a hydraulically driven inboard cylinder and horizontally by a horizontal cylinder. The structure used has an outboard arm attached to the tip that can be rotated up and down by a hydraulically driven outboard cylinder. When handling fluids, the outboard arm is connected to the cargo handling pipe on the oil tanker via a cargo handling pipe, etc., and the work begins. Each cylinder is equipped with a pressure oil circulation pipe that circulates pressure oil to each cylinder to keep each cylinder in a freely operating state. Each arm follows suit to allow cargo handling work to proceed.

By the way, if an oil tanker is affected by strong winds or waves and moves away from the sea berth beyond the safe movement range of the fluid cargo handling equipment during cargo handling operations, or if a sudden accident such as a fire occurs, It is necessary to separate the fluid handling equipment on the sea berth from the oil tanker. Therefore, a hydraulically driven emergency disconnection device consisting of a disconnection coupler installed between a pair of ball valves is usually interposed between the outboard arm and the cargo handling pipe attached to the tip of the outboard arm, and in an emergency, a limit switch etc. When the pair of ball valves are closed in response to a signal from the oil tanker, the disconnection coupler is disconnected at the same time, separating the oil tanker and the fluid handling equipment, thereby avoiding the worst case scenario.

However, after the above-mentioned disconnection coupler is disconnected, the tip of the outboard arm of the fluid cargo handling device is lower than the normal state by the weight of the cargo handling pipe left on the oil tanker and the ball valve of one of the emergency disconnection devices. It has become lighter, and it has become heavier by the weight of the liquid in the arm, but when you offset the increase in weight, the weight loss is large. Therefore, after the separation, the balance of each arm is greatly lost, causing a dangerous situation such as the arms standing up at a high speed.

The present invention was made in view of the above circumstances, and
It is an object of the present invention to provide a fluid handling device in which each arm is automatically stopped and held in a safe rest position upon disconnection of a disconnection coupler.

In order to achieve the above object, the present invention provides a riser with an inboard arm that is rotated up and down by a hydraulically driven inboard cylinder, and this inboard arm has a hydraulically driven inboard cylinder. An outboard arm is attached that is rotated up and down by an outboard cylinder and is connected to the cargo handling pipe during cargo handling, and the outboard arm is equipped with hydraulic pressure to disconnect the outboard arm from the cargo handling pipe in an emergency. A drive emergency disconnection device is provided, and the inboard cylinder and outboard cylinder are equipped with a pressure system that circulates the pressure oil discharged from each cylinder to each cylinder during cargo handling to put each cylinder in a freely operating state. In a fluid cargo handling device each provided with an oil circulation pipe, the pressure oil circulation pipe is cut off in response to a disconnection operation of an emergency disconnection device in the pressure oil circulation pipe of the outboard cylinder to prevent operation of the outboard cylinder. At the same time, a flow rate switch is provided in the pressure oil circulation line of the inboard cylinder to switch the pressure oil flow rate of the pressure oil circulation line of the inboard cylinder to a reduced state in response to the disconnection operation of the emergency disconnection device. A configuration including a valve and a switching means that operates to shut off the pressure oil circulation pipe of the inboard cylinder when the inboard arm separated from the cargo handling pipe freely operates and assumes a certain posture. When the disconnection coupler of the emergency disconnection device is disconnected, pilot pressure builds up in the on-off valve and the on-off valve is switched to the closed state, cutting off the pressure oil circulation line, thereby disconnecting the outboard cylinder. The outboard arm stops when it becomes fixed, and
The inboard arm slowly rotates at a safe speed to a substantially vertical position, and when it reaches this position, the switching means is activated to shut off the pressure oil circulation pipe,
This fixes the inboard cylinder and also stops the inboard arm.
Further, the on-off valve and the flow rate switching valve are configured to be operated directly by pilot pressure from a pilot line provided in the hydraulic circuit of the emergency disconnection device, and the switching means is a limit valve. This increases reliability by ensuring that it functions effectively even in the event of an electrical system failure during an emergency.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

First, the overall structure of the fluid cargo handling device will be described based on FIGS. 2 and 3. In the figures, 1 is a riser supported by a riser support 2 and erected on a sea berth or the like. An inboard arm 3 is attached to the upper end of the riser pipe 1 so as to be rotatable left and right via a hollow horizontal rotation joint 4 and vertically via a hollow vertical rotation joint 5.
is supported by an inboard arm support 7 which is attached to the upper end of the riser support 2 via a connecting body 6 so as to be rotatable left and right and up and down. A hydraulically driven horizontal cylinder 8 is attached to the connecting body 6, and one end of a rod 8a is connected to the upper end of the riser pipe support 2. Arm 3
can be rotated from side to side. Further, a hydraulically driven inboard cylinder 9 is attached to the root end of the inboard arm support 7, and one end of a rod 9a is connected to the connecting body 6 via a link 10. The inboard arm 3 is vertically rotated by the cylinder 9 via the inboard arm support 7.

Further, an outboard arm 11 is attached to the tip of the inboard arm 3 via a hollow vertical rotation joint 12 so as to be vertically rotatable. Further, at the root end of the inboard arm support 7, an inner balance arm 14 equipped with a main weight 13 is provided.
It is provided to extend in the opposite direction to the inboard arm 3, to which a first sheave 17 is rotatably attached together with an outer balance arm 16 having a sub-weight 15, while an inboard arm support A second sheave 19 connected to the first sheave 17 via a power transmission cable 18 is rotatably attached to the tip of the outboard arm 11 . An arm support 20 is fixedly provided. One end of the rod 21a is connected to the link 2 in the inner balance arm 14.
A hydraulically driven outboard cylinder 21 is connected to the first sheave 17 via the first sheave 17. When the outboard cylinder 21 is expanded or contracted, the first sheave 17 rotates, and the transmission cable 18 and the second
Outboard arm support 2 via sheave 19
0 moves, and the outboard arm 11 can be rotated up and down.

Further, a connecting pipe 23 is rotatably attached to the tip of the outboard arm 11 via a hollow vertical rotation joint 24, and a pair of ball valves are attached to the connecting pipe 23 at the top and bottom with a disconnection coupler 25 in between. 26
A hydraulically driven emergency disconnection device 27 comprising a double ball valve (double ball valve) is connected. and,
A cargo handling pipe 28 which is flange-connected to a cargo handling pipe on the oil tanker side is connected to the ball valve 26 below the emergency disconnection device 27.

Next, the hydraulic circuit of the fluid cargo handling device will be described with reference to FIG. 1. In the figure, numerals 30 and 31 are constant displacement first and second hydraulic pumps, respectively.
The discharge pipe 32 of the first hydraulic pump 30 is provided with an accumulator 33 that serves as a hydraulic pressure source in an emergency such as a power outage, and this discharge pipe 32 is connected to two branch pipes 3 at a downstream position from the accumulator 33.
4, 35, and each first of the first and second switching valves 36, 37 consisting of a 4-port 2-position electromagnetic switching valve.
They are connected to ports 36a and 37a, respectively. Further, the second port 36b of the first switching valve 36 is connected to the first port 40a of the double ball valve drive cylinder 40 of the emergency disconnection device 27 through a conduit 39 via a variable throttle valve 38 with a check valve. , the third port 36c is connected to a variable throttle valve 41 with a check valve, and a second port 36c.
The second port 40 of the double ball valve drive cylinder 40 is connected to the second port 40 of the double ball valve drive cylinder 40 by a conduit 44 via a check valve 43 which is pilot operated by a port position switching valve 42.
b, and the fourth port 36d is also connected to a hydraulic tank 46 by a return line 45. Furthermore, the second port 3 of the second switching valve 37
A coupler drive cylinder 49 of the emergency disconnection device 27 is connected to the coupler drive cylinder 49 of the emergency disconnection device 27 by a conduit 48 via a driven switching valve 47 which is switched between a communication position 47a and a check valve position 47b by the double ball valve drive cylinder 40. The third port 37c is connected to the second port 49b of the coupler drive cylinder 49 by a conduit 50, and the fourth port 37d is connected to the return conduit 45. There is.

On the other hand, the discharge pipe 51 of the second hydraulic pump 31
is branched into three branch pipes 52, 53, 54,
Closed center 4 port 3 position solenoid switching valve 5
5, 56, 57, 4-port 2-position pilot switching valves 58, 59, 60, and a plurality of variable throttle valves with check valves 61, 62, 63, an operating unit 64 for rotating the inboard arm, and an operating unit for up and down the outboard arm. It is connected to an operating unit 65 and an inboard arm up/down operating unit 66, respectively. The operating units 64, 65, 66 are connected to the oil tank 46 by return pipes 67, 68, 69, and are connected to the oil tank 46 by return pipes 70, 71, 7.
the first consisting of a 4-port 2-position switching valve by 2;
Each first of the second and third selector valves 73, 74, 75
The first,
Each fourth of the second and third selector valves 73, 74, 75
It is connected to ports 73d, 74d, and 75d. In addition, the first, second, and third selector valves 7
3, 74, 75 are respective first ports 73a, 74
a, 75a and each fourth port 73d, 74d, 75
d is closed, and each second port 73b, 74b, 7
5b and each third port 73c, 74c, 75c communicate with each other, and each first port 73
a, 74a, 75a are the respective second ports 73b, 74
b, 75b, each third port 73c, 74c, 7
5c has two positions, communication position B, which is connected to each of the fourth ports 73d, 74d, and 75d, and the switching can be done by pilot operation using the third switching valve 79, which is a 4-port, 2-position electromagnetic switching valve, or manually. This is becoming more and more common. Furthermore, the first, second, and third selector valves 73, 7
4, 75 second ports 73b, 74b, 75b
are connected to the first ports 8b, 21b, 9b of the horizontal cylinder 8, outboard cylinder 21, and inboard cylinder 9 by the respective pipes 80, 81, 82.
In addition, the first, second, and third selector valves 73, 7
4, 75 third ports 73c, 74c, 75c
are connected to the second ports 8c, 21c, and 9c of the horizontal cylinder 8, outboard cylinder 21, and inboard cylinder 9 through respective pipes 83, 84, and 85, respectively, and the pipes 80 and 83 are connected to the first pressure oil The circulation pipe 86 is connected to the second pressure oil circulation pipe 8, and the pipes 81 and 84 are connected to the second pressure oil circulation pipe 8.
7, pipes 82 and 85, and an auxiliary pressure oil circulation pipe 94, which will be described later, constitute a third pressure oil circulation pipe 88, respectively. In a state where the first, second, and third selector valves 73, 74, and 75 are switched to each circulation position A, each pressure oil discharged from the horizontal cylinder 8, outboard cylinder 21, and inboard cylinder 9 is The oil is circulated through the first, second, and third pressure oil circulation pipes 86, 87, and 88, respectively, and returned to each cylinder 8, 21, and 9.

In addition, the first, second, and third pressure oil circulation pipes 8
Each pipe line 80, 81, 82 of 6, 87, 88,
The first valve consists of a pilot-operated two-port switching valve.
An on-off valve 89, a second on-off valve 90, and a third on-off valve (flow rate switching valve) 91 are provided, respectively. A first pilot conduit 92 connected to the conduit 48 of the operating system and a second pilot conduit 93 connected to the conduit 50 are connected to each other, and are linked to the operation of the emergency disconnection device 27. first, second, and third on-off valves 89, 90, 91
Switching between opening and closing is performed.

Further, an auxiliary pressure oil circulation pipe 94 is attached in parallel to one of the pipes 82 constituting the third pressure oil circulation pipe 88, and the inboard arm 3 is attached to this auxiliary pressure oil circulation pipe 94. A limit valve (switching means) 95 that contacts a dog fixed in a predetermined position and switches to a closed state when the cylinder assumes a substantially vertical position, and a flow of pressure oil from the inboard cylinder 9 to the third selector valve 75. A first flow control valve 9 equipped with a check valve that prevents
6 are provided in order from the inboard cylinder 9 side. The auxiliary pressure oil circulation pipe 94 is connected to the above-mentioned third pressure oil circulation pipe 8 that communicates with the inboard cylinder 9.
When the limit valve 95 is open, pressure oil flows in parallel with the pipe line 82. When the third on-off valve 91 is closed, the oil flows only through the auxiliary pressure oil circulation pipe 94, so the flow rate is reduced to the flow rate regulated by the opening degree of the first flow rate regulating valve 96. That is, the third on-off valve 91 operates as a flow rate switching valve for the third pressure oil circulation pipe 88.

In addition, the first pressure oil circulation pipe 86 includes a pipe 8
A set of bypass pipes 9 that communicates 0 and 83 with each other.
7, 98 are provided, and each bypass pipe 97, 9
A relief valve 99 that allows the pressure oil to flow from the pipe line 83 to the pipe line 80 and a relief valve 100 that allows the pressure oil to flow from the pipe line 80 to the pipe line 83 are attached to the valve 8, respectively, when the pressure of the pressure oil exceeds, for example, 50 Bar G. ing. Furthermore, the second and third pressure oil circulation pipes 87, 88
As in the case of the first pressure oil circulation pipe 86, a pair of bypass pipes 101, 102 and a pair of bypass pipes 103, 104 are provided, respectively, and each set has a high pressure set to a high pressure of, for example, 140 Bar G. Relief valves 105, 106 and high pressure relief valve 10
7, 108 are installed, and furthermore, one set of bypass pipes 109, 110 and one set of bypass pipes 111, 112 are provided, respectively. These include low pressure relief valves 113, 114 and low pressure relief valves 115, 116 set to a low pressure of 22 BarG, for example, and a check valve 117 located on the outlet side of these relief valves 113,..., 116. ,..., 120 are respectively provided, and
Pipes 48 and 5 of the operating system of the emergency disconnection device 27
Pilot-operated 4-port 2-position switching valve 1 with pilot pipes 121 and 122 connected to 0
23, 124 are provided.

In the figure, 125 is a second flow control valve equipped with a check valve that prevents the flow of pressure oil from the inboard cylinder 9 to the third selector valve 75;
The allowable flow rate is adjusted to be larger than that of 6, and is intended to prevent the inboard arm 3 from rising at a dangerous speed. This is a switching valve that is activated when the equipment is restored.

Next, the operation of the fluid cargo handling device having the above configuration will be explained.

First, when receiving oil from an oil tanker into a storage tank on land using a fluid cargo handling device in a stored state, the third switching valve 79 is switched in FIG. , the second and third selector valves 73, 74, and 75 are switched to respective communication positions B. Then, the pressure oil sent from the second hydraulic pump 31 via each operation unit 64, 65, 66 is transferred to each first port 8b, 21b, 9b or each second port 8 of each cylinder 8, 21, 9.
By supplying rods 8a, 21 of each cylinder 8, 21, 9 to
a, 9a are telescopically operated, thereby appropriately rotating the inboard arm 3 up and down and left and right, and the outboard arm 11 up and down, respectively.
8 is flanged to a cargo handling pipe on an oil tanker, and a receiving pipe connected to the proximal end of the riser pipe 1 is connected to a receiving pipe of a storage tank to carry out cargo handling work.

Here, in FIG. 1, when the piston 21d of the outboard cylinder 21 rises, the outboard arm 11 rotates upward, and the piston 21d
When d is lowered, the outboard arm 11 rotates downward. Similarly, as the piston 9d of the inboard cylinder 9 rises, the inboard arm 3 rotates in a direction to stand up, and as the piston 9d descends, it rotates in a direction to fall forward.

Also, when handling oil, the first and second switching valves 3
6 and 37, each first port 36a, 37a is connected to each third port 36c, 37c, as shown in FIG.
The second ports 36b and 37b are communicated with the fourth ports 36d and 37d, and the pressure oil discharged from the first hydraulic pump 30 is transferred to the first switching valve 36 and the variable throttle valve with check valve. 41, switching valve 4
2, the pilot pressure is applied to the check valve 43, which is in a state where it can flow back, and flows backward into the second port 40b of the double ball valve drive cylinder 40, pushing the piston 40c of the cylinder 40 upward in the figure. , both ball valves 26, 26 of the emergency disconnection device 27 are opened, and the second port 49 of the coupler drive cylinder 49 is opened via the second switching valve 37.
b, and pushes the piston 49c of the cylinder 49 downward in the figure, keeping the disconnection coupler 25 in the connected state.

Furthermore, at the time when the cargo handling pipe 28 is connected to the cargo handling pipe on the oil tanker, the third switching valve 79 is switched again to move the first, second, and third selector valves 73, 74, and 75 to each circulation position. A, the pressure oil flows through the first, second and third pressure oil circulation pipes 86, 87, 88.
Allow it to circulate freely. Then, even if the oil tanker shakes after the cargo handling pipe 28 is connected to the cargo handling pipe on the oil tanker, each cylinder 8, 21, 9 is in a free operating state, so
The inboard arm 3 and the outboard arm 11 follow the movement of the oil tanker and rotate freely.

On the other hand, when the movement of the oil tanker increases due to strong winds or waves and moves out of the safe zone, this movement is detected by a limit switch, etc., and each solenoid is energized, and the first and second switching valves 36,
37, each first port 36a, 37a is connected to each second port 36b, 37b, and each third port 36c, 37a is connected to each second port 36b, 37b.
7c is switched to a state in which it is communicated with each of the fourth ports 36d and 37d, respectively. Then, the pressure oil discharged from the first hydraulic pump 30 is transferred to the first switching valve 36,
It flows into the first port 40a of the double ball valve drive cylinder 40 through the variable throttle valve 38 with a check valve, and pushes the piston 40c of the cylinder 40 downward in the figure, thereby disconnecting both ball valves 2 of the emergency disconnection device 27.
At the same time as closing valves 6 and 26, the piston 40c presses the driven switching valve 47 to switch it from the check valve position 47b to the communication position 47a. As a result, the pressure oil flows from the second switching valve 37 through the driven switching valve 47 to the first port 49 of the coupler drive cylinder 49.
a, the piston 49c of the cylinder 49 is pushed upward in the figure, and the separation coupler 25 is separated, thereby separating the oil tanker and the fluid cargo handling device.
Therefore, the fluid handling equipment will not be destroyed by excessive movement of the oil tanker, and furthermore,
When the disconnection coupler 25 is separated, both ball valves 26, 26 are closed, so that no oil leaks to the outside.

Furthermore, when the piston 49c of the coupler drive cylinder 49 reaches the upper end in the figure when the disconnection coupler 25 is disconnected, the pressure in the pipe line 48 becomes higher than the pressure in the pipe line 50, and the first pilot pipe line 92
As the pressure from
0 and 91 respectively switch to the closed position. Then, the first and second pressure oil circulation pipes 86 and 87 are cut off, and the horizontal cylinder 8 and outboard cylinder 21
are fixed, and the left and right rotation of the inboard arm 3 and the vertical rotation of the outboard arm 11 are prevented. On the other hand, when the third on-off valve 91 is closed, one of the pipes 82 of the third pressure oil circulation pipe 91 is shut off, but an auxiliary pressure oil circulation pipe 94 is attached to the pipe 82. Therefore, the pressure oil circulates through this auxiliary pressure oil circulation pipe 94. Therefore, the inboard cylinder 9 remains in the freely operating state, and the inboard arm 3 suddenly tries to rise toward the rest position because its tip side becomes lighter as described above. However, at this time, the piston 9d of the inboard cylinder 9 moves upward in the figure, and the pressure oil flows from the first port 9b through the reinforcing pressure oil circulation pipe 94 to the pipe 85.
However, since the auxiliary pressure oil circulation line 94 is provided with a first flow control valve 96 and the flow rate is restricted, the movement of the piston 9d is sufficiently slow and the inboard arm 3 He stood up at a slow and safe speed. When the inboard arm 3 assumes a substantially vertical posture, the limit valve 95 comes into contact with a dog provided at a predetermined position and switches to the closed state, and the auxiliary pressure oil circulation pipe 94 is also cut off to close the inboard cylinder 9. is fixed, and the inboard arm 3 is stopped.

As described above, in the above-mentioned fluid cargo handling device, the first, second, and third on-off valves 89, 90, and 91 are immediately switched to the closed state by the disconnection operation of the emergency disconnection device 27. horizontal cylinder 8
The outboard cylinder 21 is fixed, and the horizontal rotation of the inboard arm 3 and the outboard arm 1 are fixed.
1 is prevented from vertical rotation, and the inboard cylinder 9 operates slowly until the inboard arm 3 is in the rest position. Then, when the inboard arm 3 reaches a predetermined rest position, the limit valve 95 is switched, the inboard cylinder 9 is fixed, and vertical rotation of the inboard arm 3 is also prevented. Therefore, each arm 3, 1 at the time of emergency disconnection.
Even if the equilibrium of 1 is disrupted, a dangerous situation can be avoided and it is safe. Moreover, since each arm 3, 11 is stopped by hydraulic pressure alone or by a combination of hydraulic pressure and mechanical means, it functions effectively even in the event of an electrical system failure, and is extremely reliable. expensive.

Next, a case will be described in which each arm 3, 11 that has been stopped due to emergency disconnection is restored and the cargo handling operation is restarted. In this case, first, the fourth switching valve 1
26 and the first, second, and third on-off valves 89, 9
Switch cylinders 0 and 91 to a communicating state, and connect each cylinder 8 and 2.
Unfix 1 and 9. Next, the third selector valve 79 is switched to the first, second and third selector valves 73, 7.
4, 75 to each communication position B, and each cylinder 8, 2 is switched to each communication position B via each operation unit 64, 65, 66.
1 and 9 are telescopically operated, and each arm 3 and 11 is appropriately rotated to combine the separated portions of the separation coupler 25 with each other. Then, the first and second switching valves 36, 3
7, the coupler drive cylinder 49 disconnects and couples the coupler 25 into the connected state, and the double ball valve drive cylinder 40 closes both ball valves 26, 26, and when the disconnect coupler 25 is assembled, The third selector valve 79 is switched again and the first, second and third selector valves 73, 74, 7
5 at each circulation position A.

By the way, in the above fluid cargo handling device, when the fluid cargo handling device is connected to an oil tanker, the first, second, and third selector valves 73, 74, and 75 break down and
If the switch is not made, each cylinder 8, 21, 9 will move due to the rocking of the oil tanker, and abnormal pressure will occur in each pressure oil circulation pipe 86, 87, 88. For example, if the pressure is
When the pressure exceeds 50 BarG, the relief valves 99, 100 are activated and the pressure oil circulates through either of the bypass pipes 97, 98, so there is no risk of damage to the horizontal cylinder 8. Moreover, for the outboard cylinder 21 and the inboard cylinder 9, the pressure is, for example,
If it exceeds 22BarG, the low pressure relief valve 113,1
14 and resistance pressure relief valves 115, 116 respectively operate, and the pressure oil circulates through either the bypass pipes 109, 110 and the bypass pipes 111, 112, respectively, so that each cylinder 21, 9 There is no risk of damage. Furthermore,
When emergency disconnection is performed, outboard arm 1
1 and the inboard arm 3 will be greatly disrupted, but in that case, as the disconnection coupler 25 is separated, each switching valve 123, 124 will be
is switched to the closed state. And if the pressure is e.g.
If it exceeds 140BarG, high pressure relief valve 105,
106 and high-pressure relief valves 107 and 108 work, respectively, and the pressure oil circulates through either of the bypass lines 101 and 102 and either of the bypass lines 103 and 104, so that each cylinder 21,
9 damage is prevented.

In addition, in the above embodiment, the limit valve 9
5 was provided in the auxiliary pressure oil circulation pipe 94, but the pipe 82
It may be provided outside the confluence point with the auxiliary pressure oil circulation pipe 94. Further, in the embodiment, the auxiliary pressure oil circulation pipe 94 was provided in parallel with the third pressure oil circulation pipe 88, but the auxiliary pressure oil circulation pipe 94 was not provided, and the flow rate could be switched to two stages, for example. The same effect can be obtained by providing a flow rate switching valve having such a structure in the conduit 82. In that case, the limit valve 95 may be provided in the conduit 82.

As explained above, the present invention provides the pressure oil circulation line of the outboard cylinder with an on-off valve that shuts off the pressure oil circulation line and prevents the operation of the outboard cylinder in response to the disconnection operation of the emergency disconnection device. In addition, a flow rate switching valve is provided in the pressure oil circulation pipe of the inboard cylinder to switch the pressure oil flow rate of the pressure oil circulation pipe of the inboard cylinder to a reduced state in response to the disconnection operation of the emergency disconnection device, and a cargo handling valve is provided. The emergency disconnection device is equipped with a switching means that operates to shut off the pressure oil circulation pipe of the inboard cylinder when the inboard arm that has been disconnected from the pipe operates freely and assumes a certain posture. When activated,
The outboard arm is fixed relative to the inboard arm, its free movement is prevented, and
Since the unbalanced inboard arm slowly rises, accidents such as the outboard arm colliding with surrounding cargo handling pipes or structures installed on the pier are prevented. Further, the on-off valve and the flow rate switching valve are configured to be operated directly by pilot pressure from a pilot line provided in the hydraulic circuit of the emergency disconnection device, and the switching means is controlled by rotation of the inboard arm. By using a limit valve that operates automatically, even in the event of an electrical system failure in an emergency, it will function by hydraulic pressure or a combination of hydraulic and mechanical means, so it will remain stable even in the event of an electrical system failure. It works and has excellent effects with high reliability.

[Brief explanation of drawings]

The drawings show an embodiment of the fluid cargo handling device of the present invention, in which Fig. 1 is a hydraulic circuit diagram, Fig. 2 is a front view,
FIG. 3 is a side view. 1...Rise pipe, 3...Inboard arm, 9
...Inboard cylinder, 11...Outboard arm, 21...Outboard cylinder, 27...
...Emergency disconnection device, 87...Second pressure oil circulation pipe,
88... Third pressure oil circulation pipe, 90... Second on-off valve, 91... Third on-off valve (flow rate switching valve), 92...
...first pilot pipe line, 93...second pilot pipe line, 94...auxiliary pressure oil circulation pipe line, 95...limit valve (switching means).

Claims (1)

[Claims] 1. The riser pipe is provided with an inboard arm that is rotated up and down by a hydraulically driven inboard cylinder, and this inboard arm is equipped with a hydraulically driven outboard cylinder. An outboard arm is attached to the outboard arm, which can be rotated up and down and connected to the cargo handling pipe during cargo handling, and a hydraulically driven emergency disconnection device is attached to the outboard arm to disconnect the outboard arm from the cargo handling pipe in an emergency. In addition, the inboard cylinder and the outboard cylinder are provided with pressure oil circulation pipes that circulate the pressure oil discharged from each cylinder to each cylinder during cargo handling to put each cylinder in a freely operating state. In each of the provided fluid cargo handling devices, the pressure oil circulation line of the outboard cylinder is configured to block the pressure oil circulation line of the outboard cylinder in response to the disconnection operation of the emergency disconnection device to prevent operation of the outboard cylinder. In addition, the pressure oil circulation line of the inboard cylinder is provided with an on-off valve that switches the pressure oil flow rate of the pressure oil circulation line of the inboard cylinder to a reduced state in response to the disconnection operation of the emergency disconnection device. A flow rate switching valve and a switching means that operates to shut off the pressure oil circulation pipe of the inboard cylinder when the inboard arm separated from the cargo handling pipe operates freely and assumes a certain posture are provided. A fluid cargo handling device characterized by: 2 The on-off valve and the flow rate switching valve are configured to be operated directly by pilot pressure from a pilot line provided in the hydraulic circuit of the emergency disconnection device, and the switching means is operated by rotation of the inboard arm. 2. The fluid cargo handling device according to claim 1, wherein the fluid cargo handling device is a limit valve that operates when the fluid is loaded.