JPS6338562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a check valve with a safety device for a hydraulic cylinder, and in particular to a check valve with a safety device for a hydraulic cylinder, and in particular a check valve for disconnecting in an emergency disconnection device that closes and disconnects a coupling part in a fluid handling line in an emergency to cut off the flow of fluid. This invention relates to a check valve with a safety device for a hydraulic cylinder.

The fluid handling line is used, for example, to unload LNG from an LNG tanker docked at a sea berth to a storage tank, or to load LNG from a storage tank to an LNG tanker.

By the way, in the event of an emergency situation where the LNG tanker is separated from the sea berth due to strong winds or waves while unloading or loading LNG, a The fluid handling line must be separated by removing one and the other coupling couplings, and the cargo handling equipment on the sea berth and the LNG tanker must be separated from each other. In order to prevent this, it is necessary to shut off the flow of LNG within the line.
Therefore, an emergency disconnection device is usually provided in the middle of the fluid handling line as described above, which disconnects in an emergency and immediately interrupts the flow of fluid.

Generally, an emergency release device has a pair of coupling rings that connect a fluid cargo handling line, and both coupling rings are detachably fastened by a fastening clamp. Further, both coupling rings are each provided with a valve. The emergency release device includes a hydraulic cylinder for valve operation as an actuator for opening and closing each of the valves provided on one and the other coupling, and a hydraulic cylinder for valve operation as an actuator for opening and closing each of the valves provided on one and the other coupling. A two-way check valve is provided, which is operated as an actuator for disengagement, and a two-way check valve that is switched and operated by the operation of the valve operating hydraulic cylinder and sends pressurized oil to the disengagement hydraulic cylinder as appropriate. When the fluid handling line is normally used, both valves of both couplings are simultaneously opened by a valve operating hydraulic cylinder. Also, in the event of an emergency,
The hydraulic cylinder for valve operation closes both valves at the same time to cut off the flow of fluid, and at the same time opens the valve of the two-way check valve to supply pressure oil to the hydraulic cylinder for withdrawal, and the hydraulic cylinder for withdrawal is activated. When activated, both coupling springs are immediately disengaged.

However, in normal two-way check valves, even when the valve is closed during normal use, gaps occur within the valve due to variations in the shape accuracy and assembly accuracy of the component parts. Hydraulic oil that should be supplied to the closing action side of a hydraulic cylinder leaks to the disengaging action side of the same cylinder at approximately 5 to 10 c.c./sec, and the leakage amount of hydraulic oil accumulates over time. The disengagement hydraulic cylinder, which operates to maintain the fastening clamp in the fastened state, may malfunction. In other words, during normal use, when the valves of both coupling rings are open and fluid is being handled at full load, the disengagement hydraulic cylinder releases the fastening clamp and both coupling rings suddenly disengage, causing the cargo to be unloaded at full load. LNG inside
There is a problem that a large amount of dangerous fluids such as these may flow out from the coupling, which may cause an extremely serious accident.

In view of the above points, this invention has been made, namely, this invention has been made in the case where hydraulic oil leaks to the disengagement operation side of the disengagement hydraulic cylinder and the disengagement hydraulic cylinder malfunctions during normal use. It is an object of the present invention to provide a check valve with a safety device for a hydraulic cylinder, which can be operated reliably to release only in an emergency without any problems.

That is, in the present invention, switching operation is performed in conjunction with the operation of the valve operating hydraulic cylinder 28 that opens and closes the valves 20 and 21 provided in the coupling rings 1 and 2 on one side and the other side of the fluid cargo handling line, respectively. 20 and 21 are closed, one of the pressure oil inlet and outlet ports 34 connected to the hydraulic power source is connected to the check valve that is operated to inject pressure oil into the hydraulic cylinder 19 for disconnection of the couplings 1 and 2. It has a pressure oil passage 36 that connects the other pressure oil inlet/outlet 35 connected to the withdrawal hydraulic cylinder 19 and both pressure oil inlet/outlets 34 and 35 in the axial direction, and is provided on the cylinder bottom side of the valve operating hydraulic cylinder 28. A housing 33a is configured such that the pressure oil passage 36 communicates with a guide support hole 37 of the cover 32, and a housing 33a is inserted into the pressure oil passage 36 at a distance from the inner circumferential wall surface, and a housing 33a is configured such that the pressure oil passage 36 communicates with the guide support hole 37 of the cover 32. The operating rod 40 is slidable against the first urging means 42 by the pressing operation of the push rod 47 of the hydraulic cylinder 28, and the operating rod 40 is slidable against the second urging means 51. When the operating rod 40 and the push rod 47 are separated, they are pressed against the inner circumferential wall surface of the pressure oil passage 36 by the second biasing means 51, and the pressure oil passage 3
6 is shut off, and when the operating rod 40 is pressed by the push rod 47 and slides against the first biasing means 42, it is released from the pressure of the second biasing means 51 and the pressure oil passage is opened. Safety valve 49 opening 36
and the operating rod 40 located within the guide support hole 37.
A slide piece 46 is slidably inserted through a third biasing means 45 into a guide insertion hole 44b formed on the side that the push rod 47 comes into contact with, and absorbs a pressing stroke error of the push rod 47. , when the operating rod 40 is locked in the locking hole 48a formed in communication with the guide insertion hole 44b, and when the operating rod 40 and the push rod 47 are separated, the outer peripheral surface of the slide piece 46 and the guide support hole 37 to prevent the operating rod 40 from sliding by the second biasing means 51, and the operating rod 40 is pressed against the push rod 47. In this state, the detent ball 48 guides and slides the operating rod 40 by engaging the end of the push rod 47 inserted into the guide insertion hole 44b with the operating rod 40 through the locking hole 48a. It is characterized by comprising:

The present invention will be explained below based on an illustrated embodiment.

1 to 4 show an emergency disconnection device for a fluid cargo handling line in which an embodiment of a check valve with a safety device for a hydraulic cylinder according to the present invention is provided, and in the figures, 1 and 2 indicate one side and the other. This is the other coupling. These coupling rings 1 and 2 have substantially the same cylindrical shape, and one and the other mating flanges 3 and 4 are provided at one end side of each of the coupling rings 1 and 2 facing each other.
Connection flanges 5 and 6 are formed at the other end of each.

To explain the fastening mechanism of the one and the other mating flanges 3 and 4, as shown in Fig. 4,
The above-mentioned one and the other mating flanges 3, 4 are clamped and fastened at several positions along the circumferential direction of the flanges by shallow grooves of clamps 7, 8, 9 having a substantially E-shaped cross section, These adjacent clamps 7, 7, 7, 8, 7, 9 are connected to a connecting rod 10 formed in a T-shape at both ends, and a mounting rod 1.
They are connected in a chain via Oa. and the third
As shown in the figure, one clamp 8 has a mounting portion 11a of a detachable bar 11 that is longer than the connecting rod 10.
is attached, and the detachable bar 11 is able to swing freely around the attachment portion 11a as a center of rotation. Further, a spring case 12 is provided at the swinging tip of the detachable bar 11, and a bushing 14 is provided at the rear end of the opening of the spring case 12 so as to be able to swing freely relative to the detachable bar 11. There is. And detachable bar 1 inside spring case 12
1 has a compression coil spring 13 interposed therein, and this compression coil spring 13 is configured to be held between the nut and ring 11b provided at the tip of the detachable bar 11 and the boot 14. ing. An engaging pin 15 is formed on the outer surface of the article 14 so as to protrude therefrom. On the other hand, a fork 16 is attached to the other clamp 9 so as to be able to swing around the attachment part 16a as the center of rotation.
At the tip of this fork 16, the above-mentioned engagement pin 1 is attached.
An engaging portion 17 with which the connector 5 is engaged is formed. Further, the spring case 12 of the detachable bar 11 is provided with a mounting bracket 12a, and the clamp 7 adjacent to the clamp 9 is provided with a fixing portion 18. This fixed part 18 includes
The cylinder bottom side of the detachment hydraulic cylinder 19 that pushes the attachment/detachment bar 11 is swingably attached, and the piston rod 19a of the detachment hydraulic cylinder 19 is attached to the mounting bracket 12a.

Therefore, the fastening mechanism of the mating flanges 3 and 4 is connected to the piston rod 1 of the withdrawal hydraulic cylinder 19 when the fluid cargo handling line is normally used.
9a is in a contracted state, and the engaging portion 17 of the fork 16 is engaged with the engaging pin 15 of the detachable bar 11. In this state, fork 16
is pushing the engagement pin 15 along the axial direction of the distal end of the detachable bar 11 against the spring force of the compression coil spring 13, and the spring case 12 is pressed against the engagement pin 15 with the compression coil spring 13 compressed. It is engaged with the engaging portion 17 of the fork 16. That is, the detachable bar 11 is attached to the mounting portion 11a and the mounting portion 16a.
By positioning the clamps 8 and 9 inside the line connecting them, the clamps 8 and 9 are securely fastened. In addition, when the fluid cargo handling line is urgently cut off in the same fastening mechanism, the disengagement hydraulic cylinder 19 is used.
The piston rod 19b is extended to forcibly push the detachable bar 11. That is, detachable bar 1
1 and the fork 16, the fork 16 is disengaged from the engagement pin 15 during pushing, and the series of clamps 7, 8, 9 are disengaged from the mating flanges 3, 4. has been done.

Next, the ball valves 20 and 21 provided in each coupling ring 1 and 2, and the ball valve 2
The operating mechanism of 0 and 21 will be explained.

As shown in FIG. 4, the ball valve 20,
21 includes flow paths 1a and 2 of each coupling ring 1 and 2.
Valve passages 20a and 21a having the same diameter as the diameter of a are formed, and these ball valves 20 and 21 are
The valve passages 20a and 21a are rotated to open and close the passages 1a and 2a of the couplings 1 and 2, respectively. Specifically, both ball valves 20, 21 are supported in respective coupling rings 1, 2 via ball valve operating shafts 22, 23, respectively. and the first
As clearly shown in the figure, the ball valve operation shaft 2
A swing lever 24, 25 is attached to each of the swing levers 2, 23, and connecting rods 26, 27 are provided between the corresponding swing ends of the swing levers 24, 25, respectively. As shown in FIG. 2, a piston rod 29 of a hydraulic cylinder 28 for valve operation, which serves as an actuator for swinging the operation shaft 22, is attached to a bracket 22a provided on the ball valve operation shaft 22.
9a. The support type of this hydraulic cylinder 28 for valve operation is two-way Clavis 3.
0,31, and the clavis 3
0 and 31 are attached to a ball valve operating shaft 22, and when the piston rod 29 of the valve operating hydraulic cylinder 28 expands and contracts, both ball valves 20 and 21 are opened and closed.

On the other hand, as shown in FIGS. 5 and 6, the cover 32 on the bottom side of the valve operating hydraulic cylinder 28 has a
A two-way check valve 33 is installed which is switched and operated by the operation of the valve. This two-way check valve 33 has pressure oil inlets and outlets 34, 3 on the side circumferential surface of a cylindrical housing 33a, which is the main body.
5. And these pressure oil inlets and outlets 34,
35 are communicated with each other by a pressure oil passage 36 formed along the axis at the center of the housing 33a. The passage 36 is located in the center of the cover 32,
It communicates with a guide support hole 37 formed along the axis of operation of the piston rod 29. The inner diameter of the pressure oil passage 36 and the minimum inner diameter of the guide support hole 37 are larger than the outer diameter of the operating rod 40, which will be described later. Further, a holding hole 38 communicating with the pressure oil inlet/outlet 34 and a discharge hole 38a communicating the holding hole 38 with the outside are formed in the center of the tip of the two-way check valve 33. In the guide hole 39 formed between the pressure oil passage 36 and the guide support hole 37 and in the holding hole 38, there is a substantially round bar-shaped operating rod 40 that constitutes a safety device for the detachment hydraulic cylinder 19. They are slidably fitted together with a predetermined tolerance.

The length of the operating rod 40 is set so as to extend from the opening edge of the guide support hole 37 through the pressure oil passage 36 to the opening edge of the holding hole 38. Air vent holes 41 are formed along the axial direction. In addition, the holding hole 38
An insertion holding hole 43 that communicates with the air vent hole 41 is formed at the tip of the operating rod 40 that is inserted into the air vent hole 41 . Further, a retaining plate 44 is attached to the distal end surface of the housing 33a of the two-way check valve 33, in which an external opening 44a communicating with the discharge hole 38a is formed. A compression coil spring 42 is provided between the inner holding hole 43 and the holding plate 44 as a first biasing means. Furthermore, a guide insertion hole 44b communicating with the air vent hole 41 is formed at the rear end of the operating rod 40 that is loosely inserted into the guide support hole 37 of the cover 32. A compression coil spring 45 as a biasing means of No. 3, and a slide piece 46 which is slidably fitted into the insertion hole 44b with a predetermined tolerance are provided. This slide piece 46 is pressed by a push rod 47 that is attached to the piston P of the hydraulic cylinder 28 for valve operation, and the compression coil spring 45 absorbs the pressing stroke error of the push rod 47. It's becoming like that. Further, a locking hole 48a for a detent ball 48 is formed on the opening edge side of the guide insertion hole 44b, and the detent ball 48 is rolled along the inner circumferential wall 37a of the guide support hole 37. It's becoming like that. Note that this inner peripheral wall 37a
The inner diameter is enlarged from the middle, and the inner diameter of the small diameter wall 37b on the guide hole 39 side is smaller than the inner diameter of the large diameter wall 37c on the push rod 47 side. Further, the push rod 47 is formed with a holding groove 47a in which a detent ball 48 engages.

The operating rod 40 located in one pressure oil inlet/outlet 34
A flange 50 is formed along the entire circumferential direction on the distal end side. Further, a ring-shaped pouch-type safety valve 40 is swingably provided on the operating rod 40 between the flange 50 and the pressure oil passage 36. A compression coil spring 51 is provided between the safety valve 49 and the flange 50 as a second biasing means. The safety valve 49 has a large diameter larger than the inner diameter of the pressure oil passage 36, and a smaller diameter smaller than the inner diameter of the pressure oil passage 36. The safety valve 49 can slide along the axial direction of the operating rod 40 against the spring force of the compression coil spring 51, and its sliding stroke is controlled by a stopper 40a provided on the operating rod 40 and a stopper 40a provided on the operating rod 40. A locking edge 40b formed next to the flange 50
regulated by. Therefore, when the operating rod 40 is in the position shown in FIG. 3
6 is becoming occluded. That is, the inner circumferential wall surface of the pressure oil passage 36 serves as a valve seat surface for the safety valve 49.

Next, the valve operating hydraulic cylinder 28,
The driving operation relationship between the two-way check valve 33 and the withdrawal hydraulic cylinder 19 will be explained with reference to the driving hydraulic circuit diagram shown in FIG.

One and the other solenoid-operated four-port two-position switching valves 54 and 55 are connected in parallel to conduits 52 and 53 connected to an accumulator unit (not shown). This one switching valve 54 and the rod side port 5 of the valve operating hydraulic cylinder 28
6 and the bottom side port 57 are the conduit 58 and the bottom side port 57, respectively.
59. Further, the other switching valve 55 and the rod side port 60 and bottom side port 61 of the withdrawal hydraulic cylinder 19 are connected via pipes 62 and 63, respectively, and furthermore, there is a part in the middle of this pipe 63. , the two-way check valve 33 is connected via pressure oil inlets and outlets 34 and 35.

Here, the connecting flange 5 of the one coupling 1 is fastened to a transport pipe 63 of a loading arm (not shown) that is a part of the fluid handling line, and the connecting flange 6 of the other coupling 2
is fastened to a connecting pipe 64 protruding from the side of the tanker (not shown). The transport pipe 63 is connected to a storage tank (not shown). Further, the loading arm is movable three-dimensionally so as to absorb vibrations when the tanker is moored and to hold the other coupling 2 in line with the position of the connecting pipe 64.

The effect of the above configuration will be explained with reference to FIGS. 7 and 8.

First, when the fluid handling line is normally used, one and the other switching valves 54 and 55 are in the position shown in FIG. is distributed to switching valves 54 and 55 via conduit 53. The pressure oil flowing into the switching valve 54 is injected into the head side port 57 of the valve operating hydraulic cylinder 28 through a conduit 59, and the piston rod 29 of the hydraulic cylinder 28 is operated to extend. That is, with this extension operation, the ball valve operating shafts 22 and 23 are rotated, and the ball valves 2 of both coupling rings 1 and 2 are rotated.
0 and 21 are held in the open position (OPEN). At the same time, the pressure oil that has flowed into the switching valve 55 is transferred to the pipe 62.
The piston rod 19a of the hydraulic cylinder 19 is contracted (HOLD).
That is, since the detachable bar 11 is engaged with the fork 16 against the spring force of the compression coil spring 13, the mating flanges 3, 4
is definitely concluded. And in this case, 2
The operating rod 40 of the weight check valve 33 is the eighth
As shown in FIG. A, the safety valve 49 of the operating rod 40 is separated from the push rod 47, and due to the elasticity of the compression coil springs 42 and 51, the safety valve 49 is attached to the inner peripheral wall surface of the end of the pressure oil passage 36 as a valve seat surface. It is crimped. Therefore, the pressure oil passage from one pressure oil outlet 34 of the two-way check valve 33 to the other pressure oil outlet 35 via the pressure oil passage 36 is safely shut off by the safety valve 49. That is, the pressure oil being supplied from the accumulator unit side to the rod side port 60 of the withdrawal hydraulic cylinder 19 through the switching valve 55 and the pipe line 62 leaks within the switching valve 55, causing the withdrawal hydraulic cylinder 19 to leak. Even if it is sent into the other pipe line 63 that communicates with the bottom side port 61, there is a two-way check valve 33 in the operating state as described above installed in the middle of the pipe line 63, so that no leakage occurs. The released pressure oil is reliably blocked by the same valve 33. Therefore, even if pressure oil leaks from the accumulator unit side through the pipe line 63 to the bottom side port 61 of the withdrawal hydraulic cylinder 19, the leaked pressure oil will accumulate on the bottom side of the cylinder 19.
There has never been a case where the hydraulic cylinder 19 was gradually extended. That is, ball valve 2
There is no fear that the coupling rings 1 and 2 will come off during normal use when the coupling rings 0 and 21 are open, and a large amount of dangerous fluid will not be discharged from the coupling rings 1 and 2.

At this time, as shown in FIGS. 6 and 8A, the detent ball 48 is fitted into the locking hole 48a, and the large diameter wall 37c of the guide support hole 37 and the slide piece 46 Since it is sandwiched between the two, the spring force of the compression coil spring 51 causes the operating rod
0 is prevented from sliding and returning to the compression coil spring 42 side, and the slightest gap is prevented from occurring between the safety valve 49 and the pressure oil passage 36. That is, during normal use, the safety valve 49 is first pressed against the inner circumferential wall surface of the pressure oil passage 36 by the spring force of the compression coil springs 42 and 51 as the first and second biasing means, and then returned to its original position. The stop ball 48 is the spring 4
Turn the operating lever 4 so that 2 and 51 are compressed.
By fixing the 0 position, the pressing force by the springs 42 and 51 is further increased. Therefore, the blocking of the passage 36 by the safety valve 49 is ensured by both the elasticity of the springs 42 and 51 and the pressing action of the detent ball 48.

Next, in the event of an emergency situation such as the tanker leaving the sea berth, one and the other switching valves 5
4 and 55 are excited and switched by the emergency activation signal, and the pressure oil that has flowed into this switching valve 54 is transferred to the pipe line 5.
8 to the rod side port 56 of the hydraulic cylinder 28 for valve operation.
The piston rod 29 is retracted. That is, with this contraction operation, the ball valve operating shafts 22, 23 are rotated, and the ball valves 20, 21 of both coupling rings 1, 2 are held in the closed position (CLOSE), and as shown in FIG. As shown in B, the push rod 47 is inserted into the guide insertion hole 44 of the operating rod 40.
b, and presses the slide piece 46. When this slide piece 46 is slid to the left in the drawing against the spring force of the compression coil spring 45, the detent ball 48 falls into the holding groove 47a of the push rod 47, as shown in FIG. 8B. engaged with. Therefore, the operating rod 40 is integrated with the push rod 47 via the detent ball 48, and the compression coil spring 4 is guided and held on the small diameter wall 37b by the detent ball 48.
It will be slid against the spring force of 2.
Therefore, the safety valve 49 that had been blocking the pressure oil passage 36 separates from the pressure oil passage 36 to open the pressure oil passage 36, and the pressure from the pressure oil entrance 34 to the pressure oil entrance 35 via the pressure oil passage 36 is released. An oil flow path will be formed. From this, the ball valve 20,
21 is closed, the two-way check valve 33 is switched, and the pressure oil flowing into the switching valve 55 is transferred to the pressure oil passage 3 of the two-way check valve 33.
6 and pipe 63 to the bottom side port 61 of the withdrawal hydraulic cylinder 19, and causes the piston rod 19a to extend (RELEASE).
As shown in FIG. 3, the detachable bar 11 is pushed and the fork 16 is forcibly removed from the detachable bar 11 against the spring force of the compression coil spring 13, thereby connecting the clamps 8 and 9. When the two couplings 1 and 2 come off, the one and the other couplings 1 and 2 are separated.

Furthermore, when using it normally again, attach/detach bar 1.
1 and the fork 16, and by switching the switching valves 54 and 55, the valve operating hydraulic cylinder 28 is extended (OPEN), the two-way check valve 33 is switched, and the withdrawal hydraulic cylinder 19 is contracted. Activate (HOLD).
As a result, the operating rod 40 is slid as the push rod 47 retreats, and the safety valve 49 is again pressed against the inner circumferential wall surface of the open end of the pressure oil passage 36. At the same time, the detent ball 48 is rolled from the small diameter wall 37b of the guide support hole 37 to the large diameter wall 37c.
Because it is pushed out slightly to the side, the bushing rod 4
7 is disengaged from the detent ball 48, and the eighth
As shown in Figure A, the operating rod 40 and push rod 4
7 will be completely separated. As described above, the operating rod 40 is prevented from sliding by the compression coil spring 42 and the detent ball 48, so that no gap is created between the safety valve 49 and the pressure oil passage 36.

As explained above, according to the present invention, the couplings 1 and 2 on one side and the other side of the fluid handling line
The valves 20, 2 are switched in conjunction with the operation of the valve operating hydraulic cylinder 28 which opens and closes the valves 20, 21 provided in the valves 20, 2, respectively.
1 is closed, the check valve is operated to switch to inject pressure oil into the hydraulic cylinder 19 for disconnection of the couplings 1 and 2, and one pressure oil inlet/outlet 34 connected to the hydraulic power source and the hydraulic cylinder 19 for disconnection are connected to the check valve. The other pressure oil inlet/outlet 35 connected to the hydraulic cylinder 19
and a pressure oil passage 36 that communicates the two pressure oil inlets and outlets 34 and 35 in the axial direction, and is provided on the cylinder bottom side of the hydraulic cylinder 28 for valve operation.
A housing 33a is configured such that the pressure oil passage 36 communicates with the guide support hole 37 of No. 2; The operating rod 40 is made slidable against the first urging means 42 by the pressing operation of the push rod 47, and the operating rod 40 is made slidable against the second urging means 51. When the operating rod 40 and the push rod 47 are separated, they are pressed against the inner peripheral wall surface of the pressure oil passage 36 by the second biasing means 51, blocking the pressure oil passage 36, and causing the push rod 47 to When pressed, the operating rod 40 engages the first biasing means 42.
The safety valve 49 is released from the pressure of the second biasing means 51 to open the pressure oil passage 36, and the push rod 47 of the operating rod 40 in the guide support hole 37 is in a state where it is slid against the pressure of the second biasing means 51. A slide piece 46 is slidably inserted into the guide insertion hole 44b formed on the side in contact with the push rod 47 via a third biasing means 45, and absorbs a pressing stroke error of the push rod 47; Guide insertion hole 44b
A locking hole 48a of the operating rod 40 formed in communication with the
When the operating rod 40 and the push rod 47 are separated, the operating rod 40 is engaged between the outer peripheral surface of the slide piece 46 and a locking portion formed in the guide support hole 37. The second biasing means 51 prevents the operating rod 4 from sliding.
0 is being pressed by the push rod 47, the end of the push rod 47 inserted into the guide insertion hole 44b is engaged with the operating rod 40 through the locking hole 48a, thereby guiding the operating rod 40. Since it is configured to include a sliding detent ball 48, there is no possibility that the hydraulic oil will leak into the withdrawal hydraulic cylinder and the withdrawal hydraulic cylinder will malfunction during normal use, and it can be operated reliably only in an emergency. Therefore, the reliability and safety of the emergency disconnection device for the fluid handling line can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing an emergency disconnection device for a fluid cargo handling line in which an embodiment of a check valve with a safety device for a hydraulic cylinder according to the present invention is installed;
The figure is a plan view of the emergency release device, and FIG. 3 is an explanatory diagram showing the attachment and detachment state of the detachable bar of the emergency release device.
Fig. 4 is a sectional view taken along the line - - in Fig. 1, Fig. 5 is a side sectional view showing the hydraulic cylinder for valve operation, and Fig. 6 is a sectional view of this hydraulic cylinder provided on the bottom side of the hydraulic cylinder for valve operation. An enlarged sectional view showing a two-way check valve with a safety device for a hydraulic cylinder according to the invention, FIG. 7 is a driving hydraulic circuit diagram of a hydraulic cylinder for valve operation and a hydraulic cylinder for withdrawal, and FIGS. 8A, B, and C are FIG. 2 is an explanatory diagram of the operation of a hydraulic cylinder for valve operation and a check valve with a safety device for the hydraulic cylinder. 1, 2... One and the other coupling, 11
...Detachable bar, 16...Fork, 19...Hydraulic cylinder for detachment, 20, 21...Ball valve,
28... Hydraulic cylinder for valve operation, 32... Cover, 33... 2-way check valve, 33a
...Housing, 34, 35...Pressure oil inlet/outlet, 3
6... Pressure oil passage, 37... Guide support hole, 39...
Safety valve, 40... Operating rod, 42... Compression coil spring as first biasing means, 44b... Guide insertion hole, 45... Compression coil spring as third biasing means, 46... Slide top , 47... Push rod, 48... Detent ball, 48a... Locking hole, 49... Safety valve, 51... Compression coil spring as second biasing means.

Claims (1)

[Claims] 1. Valves 20 and 21 provided in one and the other couplings 1 and 2 of the fluid handling line, respectively.
It is switched in conjunction with the operation of the valve operating hydraulic cylinder 28 that opens and closes, and when both the valves 20 and 21 are closed, pressure oil is injected into the disengagement hydraulic cylinder 19 of the coupling rings 1 and 2. In the check valve that is switched and operated as shown in FIG. The pressure oil passage 36 is connected to the guide support hole 37 of the cover 32 provided on the cylinder bottom side of the valve operating hydraulic cylinder 28.
A housing 33a is configured to communicate with the housing 33a, and the housing 33a is inserted into the pressure oil passage 36 at a distance from the inner circumferential wall surface, and is operated by the pressure operation of the push rod 47 of the valve operating hydraulic cylinder 28. An operating rod 40 is provided to be slidable against a second urging means 51, and the operating rod 40 and a push rod 47 are provided on the operating rod 40 so as to be slidable against a second urging means 51. In the separated state, the second biasing means 51 presses against the inner circumferential wall surface of the pressure oil passage 36 to block the pressure oil passage 36, and the operating rod 40 is pressed by the push rod 47 so that the operating rod 40 a safety valve 49 which, when slid against the biasing means 42, is released from the pressure of the second biasing means 51 to open the pressure oil passage 36; and the operating rod 40 located within the guide support hole 37. A slide piece 46 is slidably inserted into the guide insertion hole 44b formed on the side that the push rod 47 comes into contact with via a third biasing means 45, and absorbs the pressing stroke error of the push rod 47. and is locked in a locking hole 48a of the operating rod 40 formed in communication with the guide insertion hole 44b, so that the operating rod 40
When the push rod 47 is separated, the outer peripheral surface of the slide piece 46 and the guide support hole 37 are separated.
The operating rod 4 is engaged with a locking portion formed within the
0 is prevented from sliding by the second biasing means 51, and the operating rod 40 is prevented from sliding by the push rod 47.
When the push rod 47 is pushed into the guide insertion hole 44b, the end of the push rod 47 is engaged with the operating rod 40 through the locking hole 48a, thereby guiding and sliding the operating rod 40. A check valve with a safety device for a hydraulic cylinder, characterized by comprising a ball 48.