JPH0235188B2 - RYUTAINYAKUSOCHITONIOKERUKINKYUKIRIHANASHISOCHI - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to a transportation device mainly installed in a fluid cargo handling device etc. that transports extremely low-temperature liquefied gas such as LNG (liquefied natural gas) or LPG (liquefied propane gas). This invention relates to an emergency pipe disconnection device.

[Prior art]

For example, the fluid handling equipment used 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 onto an oil tanker, may be affected by strong winds, waves, etc. If the movement of the tanker becomes large, if left unchecked, the transport pipe will break and cause major damage. Therefore, an emergency disconnection device is installed on the transport pipe, and the emergency disconnection device activates to disconnect the transport pipe. We are trying to prevent destruction.

The above-mentioned emergency disconnection device is a clamping mechanism in which a plurality of clamps that clamp the mutually joined flanges of two transport pipes are connected along their longitudinal direction by connecting their ends with pins. and a fastening mechanism for releasably fastening the clamp located at one end of the clamping mechanism and the clamp located at the other end, and the plurality of clamps constituting the clamping mechanism are arranged along the flange of the transport pipe. By fastening the clamp located at one end of the clamping mechanism and the clamp located at the other end using the fastening mechanism,
A device is known in which a disconnection device is set, and in an emergency, a fastening mechanism is activated to release a clamping mechanism to release the clamp from the flange (Japanese Patent Laid-Open No. 55-97590). ).

However, with the configuration of the emergency disconnection device described above, when the liquid to be transported is an extremely low-temperature liquefied gas such as LPG, or when the outside temperature drops below the freezing point, even if the clamping mechanism is opened, the flange or Ice adheres to the clamp and the clamp cannot be removed from the flange, resulting in a situation where the transport pipe is not cut off as planned.

Therefore, the present applicant provided the clamp with a separation cylinder and a separation spring that separate the clamp from the flange when the clamping mechanism is opened, and the applicant forcibly separates the clamp even if ice adheres to the flange or the clamp. devised an emergency disconnection device that could reliably disconnect the flange.
No. 69788 (Utility patent application No. 186599), Utility patent application No. 186599-
No. 69789 (Utility Model No. 61-186600)).

[Problem that the invention seeks to solve]

However, the above-mentioned emergency disconnection device has a problem in that the mechanism is relatively complicated and heavy due to the large number of attached devices such as a separation cylinder and a separation spring.

The present invention was made in view of the above circumstances, and
To provide an emergency disconnection device which can surely disconnect a flange even if ice adheres to the flange or clamp part, and which has an extremely simple structure and is lightweight.

[Means for solving problems]

In order to achieve the above object, the emergency disconnection device of the present invention includes a clamp that is disposed along flanges formed at the ends of transport pipes to be interconnected and that clamps these flanges in a state where they are joined to each other. and a fastening mechanism that is attached to the fastening mechanism and that releases and fastens the fastening mechanism, and the fastening mechanism is bent in accordance with the outer periphery of each flange that is joined to each other. It is composed of a plurality of spring clamps that hold the flanges in the free state and have a circular arc shape with a diameter larger than the outer diameter of each flange in the free state, and these spring clamps are bent in the same direction. The above-mentioned fastening mechanism is attached to one end and the other end of a plurality of spring clamps connected along the longitudinal direction. A fastening rod that interconnects the free ends of the spring clamps, a fastening lever rotatably attached to the free ends of the spring clamps, and an intermediate portion of the spring clamps to which the fastening levers are attached. The opening cylinder is rotatably mounted and has a piston rod tip connected to the fastening lever with a pin, and one end of the fastening rod is locked in a locking groove formed in the fastening lever. , the free ends of the spring clamps are connected to each other by pin-coupling the other ends to spring clamps other than the spring clamp to which the tightening lever is attached, and the tightening rod is connected to the piston rod of the opening cylinder. The structure is such that one end of the locking member slips out of the locking groove when the locking member is extended.

[Effect]

In the emergency disconnection device of the present invention, the plurality of spring clamps of the clamping mechanism clamp two flanges joined to each other and connect the flanges together, and the fastening rod of the fastening mechanism fastens one end of the two flanges. When locked in the locking groove of the lever, the free ends of the spring clamps are interconnected to maintain the clamped state of the flanges, so the flanges of the transport pipe are held together. .

On the other hand, when a disconnection command is issued while the fastening mechanism is fastening the free ends of the spring clamps of the clamping mechanism, the piston rod of the opening cylinder extends, and one end of the fastening rod locks the fastening lever. Since it comes out of the groove, one end and the other end of the clamping mechanism are opened, and the clamping by the clamping mechanism of the flange is released. Then, each spring clamp restores from the deflected state to the free state, and the restoring force reliably separates each spring clamp from the flange. As a result, the clamp is reliably separated from the flange even if ice is attached to the flange, and the restraint on the movement of each flange is released, allowing the flanges to be separated from each other.

〔Example〕

The attached drawings show one embodiment of this invention.
In the figure, numerals 1 and 2 are couplings attached to the ends of the transport pipes 3 and 4. At one end of these coupling rings 1 and 2, the outer surface is provided with a joint surface 5a,
Flanges 5 and 6 are formed with tapered inclined surfaces 5b and 6b that become thinner as they approach the outer periphery on the back side of the joint surfaces 5a and 6a.

Further, 7 is a clamping mechanism, which clamps the flanges 5 and 6 in a state where they are bent in accordance with the outer periphery of each of the flanges 5 and 6 joined to each other, and which also clamps the flanges 5 and 6 in a free state. , 6 (in the illustrated example, 2
It is mainly composed of spring clamps 8 (individuals). Further, the spring clamps 8 are connected along the longitudinal direction by connecting their respective ends with pins by connecting members 9 with their curved directions facing the same direction. In the embodiment, as shown in FIG. 1, the connecting member 9 includes bracket portions 9a provided at mutually adjacent ends of the spring clamps 8 to be connected to each other, and these bracket portions 9a.
These bracket portions 9 are connected to each other by pins.
and a link member 9b that connects the parts a. The spring clamp 8 has an arcuate shape with a predetermined diameter larger than the outer diameter of the flanges 5 and 6 in a free state, and is a curved beam that is bent inward and clamps the flanges 5 and 6 as shown in FIG. The inner peripheral surface has flanges 5, 6 in a joined state.
V-shaped clamping groove 8 that matches the inclined surfaces 5a and 5b of
a is formed, and a first,
Second mounting seats 10 and 11 are protruded from each other, and a third mounting seat 12 is provided to protrude from the free end of the spring clamp 8 on the other end side. Mounting rods 13 are fixed to mutually opposing positions of the flanges 5 of the coupling ring 1, and each of these mounting rods 13 has one end rotatably attached to one of the first mounting seat 10 and the connecting member 9. The other ends of the pivotally supported links 14 are rotatably connected to each other.

Moreover, the code|symbol 15 is a fastening mechanism. This includes a fastening rod 16 that interconnects the free ends of the spring clamps 8 located at one end and the other end of a plurality of spring clamps 8 connected along the longitudinal direction thereof, and a fastening rod 16 that connects the free ends of the spring clamps 8 to each other. A fastening lever 17 is rotatably attached to the free end of the spring clamp 8 with a pivot 22, and a spring clamp 8 is rotatably attached to the intermediate portion of the spring clamp 8 to which the fastening lever 17 is attached, and the tip of the piston rod 23 is connected to the fastening lever. 17 and an opening cylinder 18 connected with a pin 24.

The fastening rod 16 has one end locked in a locking groove 17a formed in the fastening lever 17, and the other end pinned to a spring clamp 8 different from the spring clamp 8 to which the fastening lever 17 is attached. By joining, the free ends of the spring clamps 8 are connected to each other, and when the piston rod 23 of the opening cylinder 18 is extended, one end of the fastening rod 16 fits into the locking groove. 17a. The fastening rod 16 has a locking shaft 19 protruding from the left and right sides of the block 20 at its free end, and the root end is connected to the clamping mechanism 7.
It is rotatably attached to the third mounting seat 12 by a fixing pin 21. On the other hand, the fastening lever 17
is a locking groove 17a in which the locking shaft 19 is locked.
and a pressing part 17b, two pieces on the left and right are integrally connected with an insertion gap G between the blocks 20, and the pressing part 17b is placed on the fastening rod 16 side to allow the second attachment of the clamping mechanism 7. This is also rotatably attached to the seat 11 via a pivot 22. The opening cylinder 18 connects the tip of the piston rod 23 to the fastening lever 17 with a pin 24, and connects the first end of the locking mechanism 7.
It is rotatably attached to a bracket 25 fixed to the attachment seat 10 by an attachment shaft 26.

Here, the relationship between the locking shaft 19, the locking groove 17a, and the pivot shaft 22 will be explained.
The locking shaft 19 is provided at the bottom of the
The center O thereof is positioned closer to the flanges 5 and 6 than the center of the pivot shaft 22, that is, the rotation center _O1 of the fastening lever 17, and is configured to be locked in the locking groove 17a. Therefore, when the locking shaft 19 is locked in the locking groove 17a, the fastening rod 1
6 in the diagonally downward right direction in FIG. 3 (see arrow) acts to rotate the fastening lever 17 in the closing direction (counterclockwise in FIG. 3), and the locking shaft 19 will not slip out of the locking groove 17a and unfasten the clamping mechanism 7. In addition,
In the diagram, the distance d between the center O of the locking shaft 19 and the rotation center _O1 of the fastening lever 17 is 3 mm.
is set to . A shear pin 27 is inserted into the fastening lever 17 from the second mounting seat 11 to prevent unexpected free rotation of the fastening lever 17. Further, a pair of pin holes 28 are bored near the locking groove 17a of the fastening lever 17.
By inserting the retaining pin 29 into one pin hole 28 near the locking groove 17a, the locking shaft 19 of the block 20 is prevented from coming off from the locking groove 17a, and the other pin hole farther from the locking groove 17a is inserted. By inserting a retaining pin 29 into the locking pin 28, the locking shaft 19 is allowed to separate from the locking groove 17a.

Next, the operation of the emergency disconnection device of the present invention will be explained.

FIG. 1 shows the state in which the flanges 5 and 6 of the emergency disconnection device are connected. In this state, the locking shaft 19 of the fastening rod 16 is locked in the locking groove 17a of the fastening lever 17, and the center O Fasten the lever 17
Since it is located on the side of the flanges 5 and 6 with respect to the center of rotation _O1 , the connected state of the flanges 5 and 6 can be stably maintained as is.

If it becomes necessary to separate the flanges 5 and 6 for some reason, the opening cylinder 18 is actuated to extend the piston rod 23. As a result, the fastening lever 17 cuts the shear pin 27 and the pivot shaft 2
2 as shown by the two-dot chain line in FIG. 3, and tilt the locking groove 17a toward the fastening rod 16 side. As a result, the locking shaft 19 that was previously locked in the locking groove 17a slips out of the locking groove 17a and releases the fastening of the clamping mechanism 7 by the fastening rod 16.

At this time, each spring clamp 8 tries to restore from the bent state to a free state in the shape of an arc with a diameter larger than the outer diameter of the flanges 5 and 6, and due to the restoring force, it separates from the flanges 5 and 6, and also Fastening lever 17 rotated by cylinder 18
The pressing portion 17b pushes the flanges 5 and 6 to help separate the spring clamp 8 from the flanges 5 and 6. Therefore, the spring clamp 8
Even if ice is attached to the flanges 5 and 6, the flanges 5 and 6 can be reliably separated.

In the above, since the clamping mechanism 7 is attached to the mounting rod 13 of the coupling ring 1 via the link 14, it will not fall downward in the open state.

To attach the emergency disconnection device to the flanges 5 and 6, tilt the fastening lever 17 toward the fastening rod 16, insert the locking shaft 19 into the locking groove 17a, and lock it to prevent the block 20 from coming off. After inserting the retaining pin 29 into the pin hole 28 closer to the groove 17a, the opening cylinder 18 is operated to contract the piston rod 23, thereby pulling the fastening lever 17 toward the opening cylinder 18 and releasing the locking shaft. 19 to the bottom of the locking groove 17a. Then, insert the shear pin 27 into the fastening lever 17 from the second mounting seat 11, and
is removed and inserted into the pin hole 28 farther from the locking groove 17a to complete the installation.

Here, some explanation will be added regarding the restoring force of the spring clamp 8 using FIGS. 4 and 5. FIG. 4 shows a curved beam constituting the spring clamp 8. When this curved beam is pulled with a tensile force N, it bends by δ and its radius changes from R ₁ to R ₂ . At this time, if the stress due to the bending moment M is within the allowable limit and the radius R ₂ is set to match the outer diameter R of the flanges 5 and 6, then the tensile force N
becomes the clamping force of the flanges 5 and 6, and when the tension on the curved beam is released, the curved beam tries to return to its original state with radius _R1 with restoring force W. For example, four such curved beams are combined to hold flanges 5 and 6, as shown in FIG. 5. In this figure, the cross section of each curved beam is shown as b=
80mm, t = 20mm, radius R ₁ = 405mm, angle α
= 88° and closely contacts the flanges 5 and 6 with R = 400 mm, the amount of deflection δ is approximately 1.5 mm, the tensile force N is 620 Kg, and the restoring force W is 180 Kg. With this degree of restoring force W, each spring clamp 8 breaks the ice and is reliably separated from the flanges 5 and 6 as described above.

〔Effect of the invention〕

As explained above, the emergency disconnection device of the present invention bends the spring clamp to clamp the flange, and in an emergency, the spring clamp is set free, and the restoring force at that time causes the clamp to stick to itself or the flange. This device breaks the ice and separates the spring clamp from the flange. Although it has few components and its structure is extremely simple and lightweight, even if ice adheres to the flange or clamp, the flange The effect is that it is possible to reliably separate the parts.

[Brief explanation of drawings]

The drawings show one embodiment of the invention.
The figure is a front view, Figure 2 is a cross-sectional view taken in the direction - arrow of Figure 1, Figure 3 is a cross-sectional view taken in the - arrow direction of Figure 2, and Figures 4 and 5 are for explaining the restoring force of the spring clamp. FIG. 5, 6... flange, 7... clamping mechanism, 8...
Spring clamp, 9... Connection member, 15...
Fastening mechanism.

Claims (1)

[Claims] 1. A clamping mechanism disposed along flanges formed at the ends of transport pipes to be connected to each other and clamping these flanges in a state where they are joined to each other, and a clamping mechanism attached to the clamping mechanism. and a fastening mechanism that releases and fastens the fastening mechanism, the fastening mechanism clamps the flanges in a state that is bent in accordance with the outer periphery of each flange joined to each other, In the free state, it is composed of a plurality of spring clamps forming an arc shape with a diameter larger than the outside diameter of each flange, and these spring clamps have their respective ends pinned with their curved directions facing the same direction. The fastening mechanism connects the spring clamps along the longitudinal direction by connecting the spring clamps at one end and the other end of the plurality of spring clamps connected along the longitudinal direction. A fastening rod that connects the free ends to each other, a fastening lever rotatably attached to the free end of the spring clamp with a pivot, and a fastening lever rotatably attached to the intermediate portion of the spring clamp to which the fastening lever is attached. and a release cylinder having a piston rod whose tip is connected to the fastening lever with a pin, and the fastening rod has one end locked in a locking groove formed in the fastening lever, and the other end locked in a locking groove formed in the fastening lever. The free ends of the spring clamps are connected to each other by pins connected to spring clamps other than the spring clamp to which the tightening lever is attached, and the tightening rod also connects the piston rod of the opening cylinder. An emergency disconnection device for a fluid cargo handling device or the like, characterized in that one end of the disconnection device is configured to come out of a locking groove when extended.