JPH0442280B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to, for example, loading oil from an oil tanker docked at a sea berth to a storage tank on land, or loading oil from a storage tank to an oil tanker. The present invention relates to a fluid handling device used.

[Conventional technology]

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. A loading arm is used, with an outboard arm attached to the tip of the arm 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.

[Problem to be solved by the invention] By the way, if an oil tanker is affected by strong winds or waves and moves away from the sea berth beyond the safe movable range of the fluid cargo handling equipment during cargo handling operations, a fire may occur. In the event of a sudden accident such as this, it is necessary to separate the fluid cargo 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 by 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 outboard arm of the fluid handling device is moved so that the tip of the outboard arm is lower than the normal state by the weight of the loading pipe left on the oil tanker and the ball valve on one side of the emergency disconnection device. 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. Therefore, we decided to temporarily hold the separated loading arm as it is.
A locking mechanism is provided to restrict movement of the loading arm after activation of the emergency disconnection device. However, keeping it in such a state for a long time places an excessive load on the loading arm and impedes recovery, so it is desirable to quickly remove oil and the like from the loading arm.

The present invention was made in view of the above circumstances, and
When the disconnection coupler is disconnected, the loading arm is automatically stopped and held, and when it is restored, the loading arm is moved to the specified position to remove the internal liquid and connect to the cargo handling pipe. The purpose of the present invention is to provide a fluid cargo handling device that can quickly perform the following tasks.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a loading arm hydraulic circuit that supplies hydraulic pressure to a loading arm actuator that drives the loading arm, and an emergency disconnection system that disconnects the loading arm from the cargo handling pipe. A disconnection device hydraulic circuit that supplies hydraulic pressure to a disconnection device actuator that drives this emergency disconnection device, and a pressure oil supply side and a pressure oil discharge side of the loading arm actuator in the loading arm hydraulic circuit. A circulation switching valve that connects to form a pressure oil circulation pipe that circulates pressure oil, and a pilot pressure from a pilot pipe that is disposed within the pressure oil circulation pipe and branches from the hydraulic circuit for the disconnection device. an on-off valve that is driven to shut off the pressure oil circulation line when the emergency disconnection device disconnects, and a pilot pressure control valve that is disposed in the pilot line and is guided from the disconnection device hydraulic circuit to the on-off valve. A lock release valve is provided which switches the operating state and returns the opening/closing valve to a position where the pressure oil circulation pipe is in communication.

[Effect]

With such a configuration, in this invention,
When the tip of the loading arm is connected to a cargo handling pipe installed on an oil tanker, etc., and the circulation switching valve is switched to form a pressure oil circulation pipe,
The loading arm moves to follow the rocking motion of the oil tanker, etc., so cargo is handled between the tanker on the water and the storage tank on land. When the rocking becomes excessive and the emergency disconnection device is activated, 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, and this causes the loading arm actuator to close. The loading arm stops when the operation is blocked.
After the emergency situation has been avoided, in order to remove the fluid remaining in the loading arm and make it ready for cargo handling again, operate the lock release valve to switch the operating state of the pilot pressure guided to the on-off valve. Return the on-off valve to the position where the pressure oil circulation pipe is in communication state. As a result, the blocking state of the loading arm actuator is released, and the loading arm returns to the freely operating state. Therefore, by switching the circulation switching valve and supplying hydraulic pressure to the loading arm actuator, the loading arm can be moved to a desired position and reconnected to the loaded pipe.

〔Example〕

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 pressure oil-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. board 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. These riser pipe 1, inboard arm 3, and outboard arm constitute a loading arm.

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 an oil 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, 54, 4-port 2-position pilot switching valves 58, 59, 60, and a plurality of variable throttle valves with check valves 61, 62, 63. 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;
2nd and 3rd selector valves (circulation switching valves) 73, 7
4, 75 first ports 73a, 74a, 75a
The first, second and third selector valves 73 and 7 are connected to each other by respective pipes 76, 77 and 78.
4, 75 each fourth port 73d, 74d, 75d
has been contacted. In addition, the first, second, and third
The selector valves 73, 74, 75 are connected to each first port 7.
3a, 74a, 75a and each fourth port 73d, 7
4d and 75d are closed, and each second port 73b,
74b, 75b and each third port 73c, 74c,
75c communicate with each other, and each first port 73a, 74a, 75a communicates with each second port 73.
b, 74b, 75b, each third port 73c, 7
4c, 75c are the respective fourth ports 73d, 74d, 7
It has two positions, a communication position B being connected to each terminal 5d, and the switching thereof is performed by pilot operation using a third switching valve 79 consisting of a 4-port 2-position electromagnetic switching valve or manually. Furthermore, each second port 73b, 74 of the first, second, and third selector valves 73, 74, 75
b, 75b are connected to the horizontal cylinder 8 and the outboard cylinder 2 by respective pipes 80, 81, 82.
1. Each first port 8b of the inboard cylinder 9,
21b, 9b, and each third port 73c, 7 of the first, second, third selector valve 73, 74, 75
4c, 75c are connected to the second ports 8c, 21 of the horizontal cylinder 8, outboard cylinder 21, and inboard cylinder 9 by respective conduits 83, 84, 85.
pipes 80 and 83 are connected to the first pressure oil circulation pipe 86, and pipes 81 and 84 are connected to the second pressure oil circulation pipe 86.
The pressure oil circulation pipe 87 and the pipes 82 and 85 form a third pressure oil circulation pipe 88, respectively. Then, 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 The oil circulates through the first, second, and third pressure oil circulation pipes 86, 87, and 88, respectively, and returns 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,
First, second, and third on-off valves 89, 90, and 91 each consisting of a pilot-operated two-port switching valve are provided, and these first, second, and third on-off valves 89,
A first pilot pipe 92 connected to the barrier 48 of the operating system of the emergency disconnection device 27 and a second pilot pipe 93 connected to the pipe 50 are connected to the pipes 90 and 91, respectively. The first, second, and third on-off valves 89, 90, and 91 are opened and closed in conjunction with the operation of the emergency disconnection device 27.

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 and the inboard cylinder 9 side.

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, which are set to a low pressure of, for example, 22 Bar G, and are also located on the outlet side of these relief valves 113,..., 116 to prevent non-returning. Valves 117, ..., 120 are provided, respectively,
and the pipe line 4 of the operating system of the emergency disconnection device 27.
Pilot-operated four-port two-position switching valves 123 and 124 are connected to pilot lines 121 and 122 at ports 8 and 50, respectively.

In the figure, 125 is a second flow control valve equipped with a check valve that blocks the flow from the inboard cylinder 9 to the third selector valve 75, and is adjusted so that the allowable flow rate is larger than that of the first flow control valve 96. This is to prevent the inboard arm 3 from being established at a dangerous speed. Reference numeral 126 denotes a fourth switching valve (lock release valve) consisting of a 4-port 2-position electromagnetic switching valve disposed in the first and second pilot pipes 92 and 93 branched from the operating system of the emergency disconnection device 27.
From the operation system of the emergency disconnection device 27, the first to
Each of the on-off valves 89-91 can be switched and controlled by switching the operating state of the pilot pressure guided to the third on-off valves 89-91. The third mentioned above
The switching valve 79 and the fourth switching valve 126 constitute a lock release mechanism for releasing the fixation of the loading arm to enable operation after the emergency disconnection device 27 is activated.

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 pressure oil pump 30 is transferred to the first switching valve 36 and the variable throttle with check valve. Passing through 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. , opens both ball valves 26, 26 of the emergency disconnection device 27, and also opens the second port 49 of the coupler drive cylinder 49 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 83, 87, 88.
is allowed to circulate freely, so that 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 will be in a freely operating state. For,
The inboard arm 3 and the outboard arm 11 follow the movement of the oil tanker and rotate freely.

On the other hand, if the movement of an oil tanker increases due to the influence of strong winds or waves, it may move 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 3
6, 37, each first port 36a, 37a connects to each second port 36b, 37b, and each third port 36
c, 37c are switched to a state where they are communicated with the respective fourth ports 36d, 37d. Then, the pressure oil discharged from the first hydraulic pump 30 flows into the first port 40a of the double ball valve drive cylinder 40 via the first switching valve 36 and the variable throttle valve with check valve 38, and the pressure oil is discharged from the first hydraulic pump 30. At the same time, the piston 40c is pushed down in the figure to close both ball valves 26, 26 of the emergency disconnection device 27.
Press the driven switching valve 47 with c. Check valve position 47
b to the communication position 47a. This results in
Pressure oil is transferred from the second switching valve 37 to this driven switching valve 47.
through the first port 49a of the coupler drive cylinder 49 and the piston 40 of the cylinder 49.
c is pushed upward in the figure to disconnect the disconnection coupler 25, and the oil tanker and the fluid cargo handling device are separated. Therefore, the fluid handling device will not be destroyed due to excessive movement of the oil tanker, and furthermore, when the disconnection coupler 25 is separated, both ball valves 26, 26 are closed, so that oil is not released to the outside. It won't leak.

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 auxiliary 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 using only pressure oil or a combination of pressure oil and mechanical means, it functions effectively even in the event of an electrical system failure, and is highly reliable. is extremely high.

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, switch the fourth switching valve 126 of the lock release mechanism to switch the first, second, and third on-off valves 89, 90, and 91 to a communicating state,
Unfix each cylinder 8, 21, 9. Then,
The third switching valve 79 is switched to switch the first, second, and third selector valves 73, 74, and 75 to their communication positions B, and the cylinders 8, 21, and 9 are controlled via the operating units 64, 65, and 66. The arms 3 and 11 are operated to extend and retract, and each arm 3, 11 is rotated appropriately to combine the separated portions of the separation coupler 25 with each other. Then, by switching the first and second switching valves 36 and 37, the coupler drive cylinder 49 disconnects and brings the coupler 25 into the connected state, and the double ball valve drive cylinder 40
When the disconnection coupler 25 is assembled, the third switching valve 79 is switched again to close the first, second, and third selector valves 73, 74, and 75. All you have to do is go to circulation position A.

By the way, in the above-described 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 exceeding 50Bar G, relief valve 99,100
Since the pressure oil is circulated through either of the bypass pipes 97 and 98, there is no risk of damage to the horizontal cylinder 8. In addition, for the outboard cylinder 21 and the inboard cylinder 9, if the pressure exceeds 22 Bar G, the low pressure relief valve 1
13, 114 and low pressure relief valves 115, 116
are working, and the pressure oil flows through the bypass pipes 109 and 1.
10, and bypass pipes 111, 11
In order to circulate through either of 2,
There is no risk of damage to each cylinder 21, 9. Furthermore, if an emergency disconnection is performed, the balance between the outboard arm 11 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 is switched to the closed state. When the pressure exceeds, for example, 140 Bar G, high pressure relief valve 1
05, 106 and high pressure relief valve 107, 108
are working, and the pressure oil flows through the bypass pipes 101 and 1.
02, and bypass pipes 103, 10
4, damage to each cylinder 21, 9 is prevented.

〔Effect of the invention〕

As explained above, the fluid loading device of the present invention includes a loading arm hydraulic circuit that supplies hydraulic pressure to a loading arm actuator that drives the loading arm, and a loading arm hydraulic circuit that supplies hydraulic pressure to a loading arm actuator that drives the loading arm, and a loading arm hydraulic circuit that supplies hydraulic pressure to a loading arm actuator that drives the loading arm. An emergency disconnection device, a disconnection device hydraulic circuit that supplies hydraulic pressure to a disconnection device actuator that drives the emergency disconnection device, and a pressure oil supply side and a pressure oil discharge side of the loading arm actuator in the loading arm hydraulic circuit. a circulation switching valve forming a pressure oil circulation pipe that connects the sides and circulates pressure oil; and a pilot pipe arranged in the pressure oil circulation pipe and branching from the hydraulic circuit for the disconnection device. an on-off valve that is driven by pressure and shuts off the pressure oil circulation line when the emergency disconnection device disconnects; and a pilot that is disposed within the pilot line and is guided from the disconnection device hydraulic circuit to the on-off valve. A lock release valve is provided that switches the operating state of the pressure and returns the opening/closing valve to a position where the pressure oil circulation pipe is in communication, thereby automatically stopping the loading arm at the same time as the emergency disconnection. This prevents the loading arm from rotating freely and colliding with the cargo handling pipe or surrounding facilities.Moreover, the loading arm is stopped by a combination of hydraulic oil and mechanical means. Because of this, it is highly reliable. In addition, when recovering, the loading arm can be moved to a predetermined position to quickly remove internal liquid and connect to the cargo handling pipe, which has the excellent effect of reducing loss of time for recovery. It is something to play.

[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, 92...First pilot pipe, 93...Second pilot pipe, 94
...Auxiliary pressure oil circulation pipe, 95...Limit valve (switching means), 126...Fourth switching valve (lock release valve).

Claims (1)

[Claims] 1. A loading arm hydraulic circuit that supplies hydraulic pressure to a loading arm actuator that drives the loading arm, an emergency disconnection device that disconnects the loading arm from the cargo handling pipe, and The disconnection device hydraulic circuit supplies hydraulic pressure to the disconnection device actuator that drives the disconnection device, and the loading arm hydraulic circuit connects the pressure oil supply side and the pressure oil discharge side of the loading arm actuator to supply pressure oil. a circulation switching valve forming a pressure oil circulation line that circulates the oil; An on-off valve that shuts off the pressure oil circulation line when the disconnection device is disconnected; and an on-off valve that is disposed in the pilot conduit and that switches the operating state of pilot pressure guided from the disconnection device hydraulic circuit to the on-off valve. A fluid cargo handling device comprising: a lock release valve that returns the on-off valve to a position where the pressure oil circulation pipe is in a communicating state.