JP2001122400A - Tank truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an excessive supply of oil in an underground tank of an oil supply station by automatically closing a delivery valve of an on-vehicle tank in response to an emergency cutoff signal from the outside. SOLUTION: Bottom valves 4 are provided on the side of the bottom 2B in liquid sections 3 respectively in an on-vehicle tank 2 of the tank truck. For delivering oil from the liquid sections 3 of the tank 2, the valves 4 are opened and closed by remote-controlling a link mechanism 16 and an operation lever 21 from the outside. A cylinder device 22 for emergency cut-off is provided in opposition to a link rod 18 of the mechanism 16. If an underground tank of an oil supply station is fully filled with oil, the cylinder device 22 is actuated by an emergency cut-off signal to drive the valves 4 in a valve closing direction through the mechanism 16, whereby unloading of oil can be automatically cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank truck that is suitably used for transporting and unloading liquids such as gasoline, light oil, and kerosene to, for example, an underground tank of a gas station.

[0002]

2. Description of the Related Art In general, a liquid such as gasoline, light oil or kerosene is transported from a large oil tank provided in a refinery or the like to a shipping destination by a tank lorry while being loaded into a tank lorry. In a gasoline filling station or the like, oil liquid transported by a tank truck is stored in an individual underground tank (oil storage tank) for each liquid type such as gasoline, light oil, and kerosene.

A liquid level gauge or the like is provided in an underground tank of a gas station, and an oil level meter is provided near an oil filling port on the underground tank side when the liquid level in the underground tank is almost full. A shutoff valve or the like for shutting off liquid (unloading) is provided (for example, JP-A-2-16687, JP-A-2-233).
398, etc.).

That is, according to this type of prior art, when unloading oil from an on-board tank of a tank truck to an underground tank of a gas station, the oil discharged from the on-board tank is gasoline, light oil, The liquid type is determined as to whether the liquid is kerosene or the like, and after confirming that the liquid types match, the unloading operation of the oil liquid is started.

After the unloading operation of the oil and liquid is started, the level of the liquid in the underground tank is measured using a liquid level gauge or the like in order to prevent the occurrence of excessive refueling in the underground tank of the gas station. Always monitor and, when the oil liquid in the underground tank approaches full, immediately close the shut-off valve provided on the underground tank side to eliminate problems such as oil liquid overflowing from the underground tank. I have.

[0006] In general, a tank lorry is provided with a discharge valve such as a bottom valve which is opened when unloading the oil liquid in the vehicle-mounted tank, and the discharge valve is externally operated by using an operation lever or the like. External operation means for opening and closing the valve body are provided.

[0007] Then, the external operating means is adapted to operate when an abnormality such as leakage of the oil from an intermediate portion or a connection portion of the oil supply hose occurs during the unloading operation of the oil.
When an operator or the like operates the operation lever urgently,
The discharge valve is closed immediately to stop the unloading of the oil liquid.

[0008]

In the above-mentioned prior art, a shut-off valve is provided on the underground tank side of the gas station, and a signal from the liquid level gauge is provided when the oil liquid in the underground tank approaches an excessive refueling state. The emergency stop of the shut-off valve is merely performed according to the following. Further, the tank truck only has an external operation means which is manually operated by an operator.

Therefore, if the shut-off valve on the underground tank side malfunctions, the oil in the underground tank may become full and overflow unless the operator notices it. Not only is wastefully consumed, but also may cause problems such as causing environmental pollution.

In particular, it has been recently recognized that, for example, a crew of a tank lorry alone can unload the oil liquid into the underground tank even after the gas station is closed.
Along with this, there is a need to develop a means for automatically closing the shutoff valve on the underground tank side and the shutoff valve on the tank lorry vehicle when excessive refueling occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to automatically close a discharge valve of a vehicle-mounted tank in response to an external emergency shutoff signal. An object of the present invention is to provide a tank lorry capable of solving problems such as excessive refueling in an underground tank at a location.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a vehicle body, a vehicle-mounted tank mounted on the vehicle body and containing a liquid therein, and a device for discharging the liquid from the vehicle-mounted tank. A discharge valve provided on the lower side of the vehicle-mounted tank and opened and closed by an external operation, and an operation lever provided outside the discharge valve and provided on the vehicle body to open and close the discharge valve. The present invention is applied to a tank lorry equipped with an external operating means.

The first aspect of the present invention is characterized in that the external operating means always allows the discharge lever to be opened and closed by the operating lever, and outputs an emergency cutoff signal. Sometimes, an emergency shutoff actuator for driving the discharge valve together with the operation lever in the valve closing direction is provided.

With this configuration, for example, when a liquid such as gasoline is being discharged (unloaded) into an underground tank of a gas station, the liquid in the underground tank may become almost full. In accordance with an emergency shutoff signal output from a liquid level gauge or the like on the underground tank, the actuator on the tank truck can be operated to drive the discharge valve in the valve closing direction, and the unloading of liquid can be automatically shut off.

According to a second aspect of the present invention, a plurality of liquid chambers are defined and provided in the vehicle-mounted tank, and the external operating means collectively opens and closes each discharge valve provided for each of the liquid chambers. Operated, the actuator is configured to close all the discharge valves in accordance with the emergency cutoff signal.

Thus, even when the liquid is discharged from any of the plurality of liquid chambers provided in the vehicle tank, the actuator on the tank lorry is operated in accordance with the emergency cutoff signal, and all the discharge valves are collectively operated. To close the valve,
Discharge of liquid can be interrupted immediately.

According to the third aspect of the present invention, the discharge valve is provided at a lower portion of the vehicle-mounted tank and provided at each of the liquid chambers and a discharge port for individually discharging the liquid in the liquid chamber. A main valve body that opens and closes the discharge port for each liquid chamber; and an operation lever or an emergency lever that is provided in the discharge port independently of the main valve body and is always in an open position that opens the discharge port. And a sub-valve element driven to a valve closing position by an actuator.

By selectively opening the main valve for each liquid chamber with the sub-valve of the discharge port provided for each liquid chamber of the tank mounted on the vehicle in the open position in advance, The liquid type can be safely determined, and for example, a liquid of a suitable liquid type can be unloaded in an underground tank of a gas station. When the liquid in the underground tank is almost full, the sub-valve of the discharge valve can be immediately driven to the closed position by operating the actuator according to an emergency shutoff signal from a liquid level gauge, for example. Unloading can be automatically stopped.

Further, according to the present invention, the external operating means is constituted by a link mechanism for transmitting the operation of the operation lever to the discharge valve, and the actuator drives the link mechanism by supplying and discharging fluid pressure from the outside. It is constituted by a cylinder device.

Thus, when the fluid pressure is supplied / discharged in accordance with the emergency cutoff signal, the actuator is actuated by the fluid pressure, and the discharge valve can be automatically closed by driving the link mechanism of the external operating means.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a tank truck according to an embodiment of the present invention will be described in detail with reference to FIGS.

In the drawing, reference numeral 1 denotes a vehicle body of a tank truck, 2 denotes a vehicle-mounted tank mounted on the vehicle body 1, and the vehicle-mounted tank 2 has a plurality of liquid chambers 3, 3 (only two) formed by a partition 2A. Each of the liquid chambers 3 contains an oil liquid as a liquid (for example, regular gasoline, high-octane gasoline, light oil, kerosene, etc.). And the vehicle tank 2
A bottom valve 4 described below is provided for each liquid chamber 3 on the bottom 2B side, and a handle 14 described later is provided on the upper 2C side.

Reference numerals 4, 4,... Denote bottom valves as discharge valves provided on the bottom 2B side of the vehicle tank 2. Each bottom valve 4 is a liquid chamber 3.
It is provided with a discharge port 5, a cover 6, a main valve element 7, and an emergency shutoff sub-valve element 9.

Reference numeral 5 denotes a discharge port formed of a substantially L-shaped tube protruding downward from the bottom 2B of the vehicle tank 2. The discharge port 5 includes a cover 6 and a valve casing of the bottom valve 4 as shown in FIG. Make up. And the discharge port 5
An annular mounting flange 5A fastened to the bottom 2B of the vehicle-mounted tank 2 using bolts or the like, a bent portion 5B protruding downward from the mounting flange 5A and bent in an L-shape, and a rearward portion via the bent portion 5B. And a cylindrical connecting portion 5C to which an oil supply hose 35 described later is connected at the opening end side.

The discharge port 5 has a mounting flange 5A.
An annular protrusion 5D and an annular main valve seat 5E are provided on the upper surface side of the, and a cover 6 described later is fixed to the annular protrusion 5D by means such as screwing. Further, on the inner peripheral side of the discharge port 5, an annular auxiliary valve seat 5F is provided between the bent portion 5B and the connection portion 5C.
Is formed, and a sub-valve body 9 described later is separated from and seated on the sub-valve seat 5F.

Reference numeral 6 designates a valve casing of the bottom valve 4 as a discharge port 5
The cover 6 is formed in a substantially conical cup shape, and an upper end side thereof is a screw cylinder portion 6A to which a valve shaft 8 described later is screwed. The lower end of the cover 6 is a circular opening 6B, and the inner peripheral side of the opening 6B is screwed to the outer periphery of the annular projection 5D of the discharge port 5. The cover 6 is formed with a plurality of communication holes 6C, 6C,.
The oil liquid inside is discharged to the discharge port 5 side through each circulation hole 6C.

Reference numeral 7 denotes a disc-shaped main valve body which is located in the cover 6 and is detachably seated on the main valve seat 5E of the discharge port 5, and reference numeral 8 denotes a valve shaft for opening and closing the main valve body 7. The valve shaft 8 is screwed and inserted into the threaded cylindrical portion 6A of the cover 6, and a main valve body 7 is rotatably mounted at its lower end via a bearing or the like. The valve shaft 8 is rotated by a handle 14, which will be described later, to be moved up and down with respect to the screw cylinder 6A of the cover 6. At this time, the main valve body 7 is moved up and down from the main valve seat 5E. To take off and sit on.

Reference numeral 9 denotes a sub-valve as an emergency valve provided in the discharge port 5 at a distance from the main valve 7, and the sub-valve 9 is disposed in the discharge port 5 as shown in FIGS. The sub-valve seat 5F provided rotatably through the arm 10 and in the discharge port 5
The discharge port 5 is opened and closed by taking off and seating on the port.

Reference numeral 11 denotes a rotating shaft for opening and closing the sub-valve 9. The rotating shaft 11 is connected to the sub-valve 9 via an arm 10 in the discharge port 5, and the lower end is connected to the discharge port 5. It protrudes downward to the outside. A crank 12 is attached to the protruding end side of the rotating shaft 11, and the crank 12 rotates the rotating shaft 11 with an operating force from a link mechanism 16, which will be described later. The opening and closing operations are performed via the.

Reference numeral 13 denotes a spring which urges the crank 12 in the opening and closing directions of the sub-valve element 9. The spring 13 is latched between the outside of the discharge port 5 and the crank 12.
A tensile force is constantly applied. And spring 1
Numeral 3 is for selectively biasing the sub-valve 9 to one of the valve opening position and the valve closing position.

That is, when the crank 12 is turned in the direction of arrow A in FIG. 2 by the link mechanism 16 described later, the sub-valve 9 is turned by the crank 12 to the valve closing position via the turning shaft 11. Then, the spring 13 urges the sub-valve element 9 through the crank 12 in a direction of pressing the sub-valve body 9 against the sub-valve seat 5F. When the link mechanism 16 rotates the crank 12 in the direction indicated by the arrow B, the sub-valve 9 is rotated to the open position by the crank 12, and the spring 13 moves the sub-valve 9 through the crank 12 to the sub-valve seat. It is biased in the direction away from 5F.

Reference numeral 14 denotes a handle rotatably provided on the upper portion 2C of the vehicle tank 2. The handle 14 is attached to the upper end of an operation shaft 15, and the operation shaft 15 is
A, 15B and the like are connected to the valve shaft 8. The operating shaft 15 constitutes a part of the valve shaft 8 and the handle 14
The main valve element 7 of the bottom valve 4 is opened and closed in accordance with the turning operation of.

Further, an air introduction valve (not shown) is provided in the upper part 2C of the vehicle tank 2 for each liquid chamber 3, and the air introduction valve is opened by the main valve element 7 of each bottom valve 4. Sometimes, the valve is opened following this. The air introduction valve allows air to flow into and out of the liquid chamber 3 when the valve is opened, prevents the inside of the vehicle tank 2 from being in a negative pressure state, and allows the oil liquid in each of the liquid chambers 3 to move to the outside. It compensates for smooth discharge.

Reference numeral 16 denotes a link mechanism for simultaneously opening and closing the sub-valve elements 9 of the bottom valves 4 from the outside. The link mechanism 16 is connected to each discharge port 5 as shown in FIGS. And link rods 17, 18 extending in parallel to each other in the front and rear directions of the vehicle body 1 at the lower side of the vehicle body 1, and a rotation link 19, etc., which is rotatably pin-connected between the link rods 17, 18. The rotation link 19 is rotatably attached to the vehicle body 1 via a support pin 20. And the link mechanism 16
, Together with an operation lever 21 described later, constitutes external operation means of each bottom valve 4.

Here, the link rod 1 of the link mechanism 16
Numeral 7 is connected to a crank 12 below each discharge port 5 as shown in FIG. 2, and turns the crank 12 in the directions of arrows A and B. Also, the other link rod 18
As shown in FIG. 5, one end is connected to the operation lever 21 via a pin 18A, and the other end is an abutting end 18B for a rod 22E of a cylinder device 22, which will be described later.

The rotation link 19 connecting the link rods 17 and 18 is rotated about the support pin 20 with respect to the vehicle body 1 so that, for example, the operation lever 21
When the link rod 18 is displaced in the direction of arrow C in FIG. 5 by using the arrow, the link rod 17 is driven in the direction of arrow A, thereby closing the sub-valve 9 of the bottom valve 4 as shown in FIG. Pivot to the position. When the link rod 18 is displaced in the direction indicated by the arrow D in FIG. 5, the link rod 17 is driven in the direction indicated by the arrow B, whereby the sub-valve element 9 of the bottom valve 4 is moved in FIG.
It rotates to the valve opening position indicated by a virtual line inside.

Reference numeral 21 denotes a pin 1 at one end of the link rod 18.
The operation lever 21 constitutes an emergency lever connected via the shaft 8A. The operation lever 21 is rotatably attached to the rear side of the vehicle body 1 via a support shaft 21A as shown in FIG. Then, the operation lever 21 is manually operated by an operator of the tank truck, for example, at the time of unloading of the oil or the like, and is turned to the position shown by the solid line in FIG. The valve body 9 is collectively placed at the valve opening position.

On the other hand, during the unloading operation of the oil liquid, for example, a liquid leak occurs from a connection point of the oil supply hose 35 or the like.
Alternatively, when an abnormal situation such as an earthquake or other disaster occurs, the operator rotates the operation lever 21 from the position indicated by the solid line in FIG. 5 to the position indicated by the virtual line in FIG. It is displaced in the direction of arrow C in the middle. Then, at this time, the link rod 17 is driven in the direction indicated by the arrow A via the rotation link 19, whereby the sub-valve elements 9 of each bottom valve 4 are collectively rotated to the valve closing position.

Reference numeral 22 denotes a cylinder device constituting an actuator for emergency shutoff. The cylinder device 22 comprises an air cylinder. As shown in FIG. 5, a tube 22A is slidably inserted into the tube 22A. A piston 22D that defines air chambers 22B and 22C inside 22A,
A proximal end is fixed to the piston 22D and a distal end is constituted by a rod 22E protruding outside the tube 22A.

Here, the cylinder device 22 is provided on the vehicle body 1 as shown in FIGS. 1 and 5, and the projecting end side of the rod 22E is disposed at a position facing the contact end 18B of the link rod 18. The cylinder device 22 normally holds the rod 22E in a reduced state as shown in FIG. 5 and allows the operation lever 21 to operate the link rod 18 in the directions indicated by arrows C and D. Therefore, the link mechanism 16 can be manually operated by the operation lever 21 to open and close the sub-valve 9 manually.

However, when the rod 22E of the cylinder device 22 extends from the tube 22A in accordance with an emergency shutoff signal described later, the link rod 18 can be forcibly driven in the direction of arrow C in FIG. It can be driven in the direction A to turn all the sub-valve elements 9 of each bottom valve 4 to the valve closing position. Then, at this time, the operation lever 21 follows the movement of the link rod 18, and is turned from the position shown by the solid line to the position shown by the virtual line in FIG.

Reference numeral 23 denotes a compressed air source. The compressed air source 23 is constituted by an air compressor, an air tank, and the like mounted on the vehicle body 1 of the tank truck, and supplies an air pressure such as compressed air to the cylinder device 22.

Reference numeral 24 denotes a directional control valve disposed between the pressure source 23 and the cylinder device 22. The directional control valve 24 comprises an electromagnetic valve or the like having a solenoid 24A.
4B, it is held at the switching position (a). And
The directional control valve 24 supplies the air pressure from the compressed air source 23 to the air chamber 22C of the cylinder device 22 at the switching position (a), and opens the air chamber 22B side to the atmosphere from the exhaust port 24C of the directional control valve 24.

The direction control valve 24 is provided with a solenoid 24A.
Is switched to the switching position (b) when the is excited, and at this time, the air pressure is supplied to the air chamber 22B of the cylinder device 22,
The air chamber 22C side is opened to the atmosphere. Accordingly, the cylinder device 22 extends the rod 22E at a high speed, and urgently shuts off all the bottom valves 4 as described above.

Next, 31 is an underground tank of a gas station, 32 is an oiling pipe provided in the underground tank 31 as shown in FIG. 4, and the oiling pipe 32 is suspended downward into the underground tank 31 and has an upper end side. Is connected to an oil supply pipe 33 such as a buried pipe. A lubrication control valve 34, such as an air valve, is provided at the upper end of the lubrication pipe 33, and the lubrication control valve 34 constitutes a shutoff valve on the fueling station side.

Reference numeral 35 denotes an oil supply hose for unloading the oil from the vehicle tank 2. The oil supply hose 35 has one end connected to the discharge port 5 of the bottom valve 4 as shown in FIG. It is connected to the lubrication pipe 33 via a lubrication control valve 34. The oil supply hose 35 discharges the oil liquid in the liquid chamber 3 transported by the tank truck into the underground tank 31.

Numeral 36 denotes a liquid level gauge attached to the underground tank 31 of the gas station. The liquid level gauge 36 is constituted by, for example, a capacitance type, an optical type or a float type liquid level detector. The detection unit 36A is hung down into the underground tank 31. The liquid level meter 36 constantly monitors the liquid level in the underground tank 31. When the underground tank 31 is almost full, an emergency shutoff signal is sent to a controller 3 described later.
7 is output.

Reference numeral 37 denotes a controller as an unloading control device constituted by a microcomputer or the like. As shown in FIG.
The output side is connected to the solenoid 24A of the direction control valve 24 and the like.
The controller 37 has a storage unit 37A including a ROM, a RAM, and the like, and the storage unit 37A stores a program for an unloading control process shown in FIG.

Here, the controller 37 may be a computer for unloading control processing provided at, for example, a gas station, or may be constituted by an on-board computer mounted on a tank truck. . And
When a vehicle-mounted computer is used, the operation of connecting the liquid level gauge 36 at the gas station to the input side of the controller 37 may be performed prior to the unloading operation of the oil liquid.

The safety confirmation switch 38 is provided on the tank truck and is operated manually before starting the unloading operation of the oil liquid, thereby simulating the operation check of the directional control valve 24 and the cylinder device 22 and the like. This will ensure safety in an emergency.

It should be noted that the safety confirmation switch 38 may be used in combination with an earth confirmation device for confirming that the tank lorry is grounded when unloading the oil tank from the underground tank 31 by the tank lorry. Good thing.

The tank lorry according to the present embodiment has the above-described configuration. Next, the unloading control processing of the oil by the controller 37 will be described with reference to FIG.

First, when the tank lorry arrives at the gas station, the oil liquid is discharged from the liquid chamber 3 of the vehicle-mounted tank 2 to refuel the underground tank 31 at the gas station. One end of the hose 35 is connected to the connection portion 5C of the discharge port 5, and the other end is connected to an oil supply pipe 3 of a gas station.
3 through a lubrication control valve 34.

At this stage, the operator performing the unloading operation of the oil liquid rotates the operation lever 21 to the position shown by the solid line in FIG. The body 9 is opened collectively.

Next, in step 2, the safety confirmation switch 38 shown in FIG. 5 is manually operated to check whether the directional control valve 24 and the cylinder device 22 operate normally or not. Further, the operator climbs on the upper portion 2C of the vehicle-mounted tank 2 and releases the lock device provided near the handle 14 using a key switch (none of which is shown), and the oil liquid to be unloaded is transferred to the underground tank. It is confirmed whether the oil liquid in 31 matches the liquid type. In this case, the lock device cannot be released unless the liquid types match.

Then, in step 3, it is determined whether or not the safety confirmation work has been completed. While the determination is "NO", the process returns to step 2, and if "YES" is determined in step 3, the next step 4 is performed. And start the unloading operation of the oil liquid. In this case, the operator who climbs on the upper portion 2C of the vehicle-mounted tank 2 rotates the handle 14 in a state where the unloading permission is confirmed, and the bottom valve is operated via the operation shaft 15 and the universal joints 15A and 15B shown in FIG. 4 is rotated.

At this time, the valve shaft 8 is connected to the screw cylinder 6 of the cover 6.
Since it is screwed into A, the valve shaft 8 rises upward with respect to the cover 6 as the handle 14 rotates. And
The main valve body 7 is separated from the main valve seat 5E in accordance with the elevation of the valve shaft 8, and the inside of the liquid chamber 3 is communicated with the inside of the underground tank 31 via the discharge port 5, the oil supply hose 35 and the like. On the upper side 2C side of the vehicle-mounted tank 2, the handle 14 also opens the air introduction valve, so that even if the liquid level in the vehicle-mounted tank 2 changes, the internal pressure of the vehicle-mounted tank 2 does not change. 3 can be smoothly discharged into the underground tank 31.

Next, in step 5, the liquid level signal in the underground tank 31 is read from the liquid level gauge 36 to monitor the level of the liquid level in the underground tank 31 and to unload the oil liquid. Is detected. Then, in step 6, it is determined whether the unloading amount of the oil liquid has reached a predetermined oil liquid amount, that is, whether or not the unloading has been completed. When the determination is "YES", the predetermined amount of the oil liquid is discharged. Since this is the case where the unloading is performed in the underground tank 31, the processing operation is completed at this stage.

While the determination in step 6 is "NO", the process proceeds to step 7 to determine whether or not the underground tank 31 is full, that is, according to the level signal from the level gauge 36, the level in the underground tank 31 is changed. Is almost full or not, and “N
While the determination is “O”, the process returns to step 5 to continue the subsequent processes.

If "YES" is determined in step 7, the oil liquid in the underground tank 31 is almost full, and the process proceeds to step 8 to output an emergency shutoff signal. Then, in the next step 9, the solenoid 24A of the direction control valve 24 is excited in accordance with the emergency cutoff signal, and the direction control valve 24 is switched to the switching position (b).

Thus, the air pressure from the compressed air source 23 is supplied to the air chamber 22B of the cylinder device 22, and the rod 22E of the cylinder device 22 is extended at a high speed by the air pressure. At this time, the cylinder device 22 is
5 is driven in the direction of arrow C in FIG. 5, and the link rod 17 is driven in the direction of arrow A.
All the bottom valves 4 can be shut off urgently on the tank 2 side of the tank truck.

As a result, the discharge of the oil liquid from the liquid chamber 3 of the vehicle-mounted tank 2 into the underground tank 31 can be automatically stopped, and the excessive refueling of the underground tank 31 can be reliably prevented. At this time, the lubrication control valve 34 on the underground tank 31 side is also automatically closed in accordance with the emergency shutoff signal, so that double safety is ensured.

Next, at step 10, while the sub-valve element 9 of each bottom valve 4 is closed by the cylinder device 22, a residual oil treatment for introducing the oil liquid remaining in the oil supply hose 35 to the underground tank 31 is performed. Thus, the unloading operation of the oil liquid is completed.

Thus, according to the present embodiment, the sub-valve 9 of the bottom valve 4 for discharging oil from the on-vehicle tank 2 of the tank truck is remote-connected from the outside using the link mechanism 16 and the operating lever 21 and the like. In addition to being opened and closed by operation, a cylinder device 22 for emergency shutoff is provided on the link rod 18 of the link mechanism 16 so as to face the contact end 18B.

Thus, when unloading the oil liquid transported from the tank 2 of the tank truck into the underground tank 31 of the gas station, the sub-valve 9 of each bottom valve 4 is remotely operated by the operating lever 21 and opened. , Can be closed. When the oil liquid in the underground tank 31 is almost full, the cylinder device 22 on the tank truck is operated by an emergency cutoff signal output from the liquid level gauge 36 on the underground tank 31 via the controller 37. , The bottom valve 4 can be driven in the valve closing direction, whereby the unloading of the oil liquid can be automatically shut off.

Therefore, in the present embodiment, by providing the cylinder device 22 for emergency shutoff in the tank truck, the bottom valve 4 is automatically turned on in an emergency such as when the inside of the underground tank 31 becomes full of oil. Can be solved, and problems such as excessive refueling in the underground tank 31 can be solved.

For this reason, for example, even after the gas station is closed, the operation of unloading the oil liquid into the underground tank 31 can be performed by the operator of the tank lorry vehicle alone, and the safety during such an unloading operation alone can be improved. Nature can be secured.

Also, the cylinder device 22 normally operates as shown in FIG.
Since the rod 22E is configured to be kept in the contracted state as shown in FIG. 2, the manual operation of the operation lever 21 is not hindered by the cylinder device 22, and the sub-valve body 9 is operated by the operation lever 21 during a normal unloading operation or the like. Can be opened and closed.

In the above embodiment, the cylinder device 22 used as an emergency shutoff actuator is described as being constituted by an air cylinder. However, the present invention is not limited to this, and a hydraulic cylinder or the like may be used. . Further, a hydraulic motor, an air motor, an electric motor, or the like may be used as the actuator. In this case, the operation lever 21 or the rotation link 19 may be configured to be rotated by the motor.

Further, in the above-described embodiment, the bottom valve 4 of a type having the main valve body 7 and the sub-valve body 9 separately has been described as an example. However, the present invention is not limited to this. FIG.
As in the first modification shown in FIG.
May be applied to the one configured by the discharge port 5, the cover 42, the main valve body 43, the auxiliary valve body 44 for emergency shutoff, and the like.

In this case, the bottom valve 41 has substantially the same structure as the liquid supply / discharge device for a tank truck described in Japanese Patent Application Laid-Open No. 9-104286 previously proposed by the present applicant. The sub-valve element 44 of the bottom valve 41 is closed when the lever 45 corresponding to the crank 12 described in the above-described embodiment is rotated in the direction of arrow A, and the lever 45 is moved to the direction of arrow B.
The valve is opened when rotated in the direction.

Further, according to the present invention, as in a second modified example shown in FIG.
, A cover 52, and a single valve body 53 that also serves as a main valve body and an emergency shutoff valve.

In this case, the bottom valve 51 has substantially the same configuration as the discharge valve device for a tank lorry described in Japanese Patent Application Laid-Open No. H10-72088 previously proposed by the present applicant. And the single valve body 53 also serving as the emergency shutoff valve is
When the lever 54 corresponding to the crank 12 described in the above embodiment is turned in the direction of arrow A, the valve is closed, and the lever 5
4 is opened when it is rotated in the direction of arrow B, and is also opened and closed via the lever 54 or another lever (not shown) during normal operation.

Further, in the above-described embodiment, the case where an oil liquid such as gasoline is stored in the vehicle-mounted tank 2 of the tank truck has been described as an example. Alternatively, for example, a liquid such as a chemical agent may be transported. It may be used when doing so.

[0075]

As described above in detail, according to the first aspect of the present invention, the emergency operation actuator is provided in the external operation means for opening and closing the discharge valve of the vehicle tank from outside. For example, when unloading a liquid such as gasoline from an in-vehicle tank into an underground tank at a gas station, the discharge valve can be opened and closed by an operation lever. And
If the liquid in the underground tank is almost full,
Activate the actuator on the tank truck in accordance with the emergency shutoff signal output from the liquid level gauge etc. on the underground tank,
The discharge valve can be driven in the closing direction, whereby the unloading of the liquid can be automatically shut off, and problems such as excessive refueling in the underground tank can be solved.

According to a second aspect of the present invention, a plurality of liquid chambers are defined and provided in the vehicle-mounted tank, and the external operating means collectively opens and discharges the respective discharge valves provided for each of the liquid chambers. The closing operation is performed, and the actuator is configured to close all the discharge valves in accordance with the emergency cutoff signal. Therefore, even if the liquid is discharged from any of the plurality of liquid chambers provided in the vehicle-mounted tank, the emergency cutoff is performed. The actuator on the tank lorry side is operated according to the signal, and all the discharge valves can be closed at once.
Discharge of liquid can be interrupted immediately.

According to the third aspect of the present invention, since the discharge valve is provided with the discharge port, the main valve body and the sub-valve body, the sub-valve of the discharge port provided for each liquid chamber of the vehicle-mounted tank is provided. By selectively opening the main valve body for each liquid chamber in a state where the body is in the valve opening position in advance, liquid type discrimination can be performed safely, for example, in a basement tank of a gas station. The liquid of the liquid type can be unloaded. When the liquid in the underground tank is almost full, the sub-valve of the discharge valve can be immediately driven to the closed position by operating the actuator according to an emergency shutoff signal from a liquid level gauge, for example. Unloading can be automatically stopped.

Further, according to the invention described in claim 4,
The external operation means is constituted by a link mechanism or the like for transmitting the operation of the operation lever to the discharge valve, and the actuator is constituted by a cylinder device for driving the link mechanism by supplying and discharging fluid pressure from the outside, so that the emergency shutoff is performed. By actuating the actuator by supplying and discharging fluid pressure in accordance with the signal, and driving the link mechanism of the external operating means, the discharge valve of the vehicle-mounted tank can be automatically closed. Can be performed safely.

[Brief description of the drawings]

FIG. 1 is an overall view showing a tank truck according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing a bottom valve, a handle, and the like in FIG. 1;

FIG. 3 is a cross-sectional view showing a sub-valve element and the like of the bottom valve from the direction of arrows III-III in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a state in which oil is unloaded from a tank truck to an underground tank of a gas station.

FIG. 5 is a control circuit diagram showing a drive circuit and the like of the cylinder device.

FIG. 6 is a flowchart illustrating an oil liquid unloading control process performed by a controller.

FIG. 7 is a longitudinal sectional view showing a bottom valve of a tank lorry according to a first modified example.

FIG. 8 is a longitudinal sectional view showing a bottom valve of a tank lorry according to a second modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 On-vehicle tank 3 Liquid chamber 4,41,51 Bottom valve (discharge valve) 5 Discharge port 7,43 Main valve body 8 Valve shaft 9,44 Sub-valve body 16 Link mechanism (external operation means) 17,18 Link rod DESCRIPTION OF SYMBOLS 19 Rotation link 21 Operation lever 22 Cylinder device (actuator) 24 Direction control valve 31 Underground tank 36 Level gauge 37 Controller (Unloading control device)

Continuation of the front page (72) Inventor Takeshi Sato 3-9-7, Tsurumichuo, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Tokiko Techno Co., Ltd. F term (reference) 3E070 AA07 AB03 BH06 GB16 3E083 AA13 AB08 AD01

Claims (4)

[Claims] 1. A vehicle body, an on-vehicle tank mounted on the vehicle body and containing a liquid therein, and provided on a lower side of the on-vehicle tank for discharging the liquid in the on-vehicle tank, and opened and closed by an external operation. A tank lorry vehicle comprising: a discharge valve to be closed; and external operation means provided on the vehicle body outside the discharge valve and having an operation lever for opening and closing the discharge valve. Means include an emergency shutoff valve that normally allows the discharge valve to be opened and closed by the operation lever, and drives the discharge valve together with the operation lever in the valve closing direction when an emergency shutoff signal is output. A tank truck with an actuator. 2. A plurality of liquid chambers are defined and provided in the on-vehicle tank, and the external operating means collectively opens and closes discharge valves provided for each of the liquid chambers. 2. The tank lorry according to claim 1, wherein all the discharge valves are closed in accordance with the emergency shutoff signal. 3. The discharge valve according to claim 1, wherein the discharge valve is disposed at a lower side of the on-vehicle tank, and is provided for each of the liquid chambers. A main valve body that opens and closes the discharge port, and is provided in the discharge port independently of the main valve body and is always in an open position where the discharge port is opened, and is closed by the operation lever or the actuator in an emergency. The tank lorry according to claim 2, further comprising a sub-valve driven at a position. 4. The external operating means comprises a link mechanism for transmitting operation of an operating lever to the discharge valve, and the actuator comprises a cylinder device for driving the link mechanism by supplying and discharging fluid pressure from the outside. The tank lorry according to claim 1, wherein the vehicle is a truck.