JPH0229535B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for opening and closing a bottom valve of a tank truck, which is equipped with a tank for storing liquid, mounted on the vehicle, in order to transport fuel or refuel an airplane. This relates to a bottom valve operating device for a tank truck.

Conventionally, in order for workers to open and close the bottom valves of tank trucks from the top of the tank or on the ground, bottom valves that open and open using fluid pressure against the projectile are placed at the top and bottom of the tank. It was provided to be operated by a valve. For this reason, it is necessary to install a number of expensive operation valves corresponding to the number of bottom valves at the top and bottom of the tank, and the fluid piping for these operation valves becomes complicated.
The disadvantage was that the assembly work was troublesome and it could not be manufactured at a low cost.

The present invention is equipped with an electromagnetic on-off valve that controls the bottom valve that is opened and closed by fluid pressure, and the operation switches for opening and closing this electromagnetic on-off valve are installed in multiple locations, such as above and below the tank, thereby eliminating the need for expensive operation. By reducing the number of valves, using inexpensive operation switches, and using electrical wiring instead of fluid piping, it is inexpensive.
The present invention also aims to provide a bottom valve operating device for a tank truck that is easy to assemble.

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

In Figs. 1 to 8, 1 indicates a tank truck, in which a tank 5 for storing liquid is mounted on a chassis 3, and the tank 5 is connected to tank chambers 9, 9, 9 by partition plates 7, 7. It is divided. Reference numeral 11 indicates an inlet provided at the top of each tank chamber 9, 13 indicates a bottom valve provided at the bottom of each tank chamber 9, and 15 indicates each bottom valve 13.
This is a pipe that communicates between the discharge valve 17 and the discharge valve 17. 19 is an electromagnetic on-off valve that controls the opening operation of the bottom valve 13;
S' is an operating switch provided at the upper and lower parts of the tank 5, respectively, for opening and closing the electromagnetic on-off valve 19, and is fixed to the switch mounting plate 20. 21 is an emergency operation valve, 23 is an automatic emergency valve, 25 is an air tank, and 27 is a ladder.

FIG. 2 shows the bottom valve 13, which is constructed as follows. That is, the valve body 29 is fixed to the bottom of the tank 5 and communicates with the piping 15. 3
Reference numeral 1 denotes a valve body fixed to a valve rod 33 that fits into the valve body 29 so as to be movable up and down, and opens and closes the valve seat 35 of the valve body 29. 37 is a piston fixed to the lower end of the valve stem 33, and a cylinder portion 39 provided at the lower part of the valve body 29.
It is slidably fitted inside. 41 is piston 3
An air pipe 45 communicates with a chamber 43 below 7, and a bomb 45 biases the valve body 31 in a direction to close it.

FIG. 3 shows the electromagnetic on-off valve 19, which is constructed as follows. That is, 47 is a spool that is slidably fitted into the valve body 49, 51 is a bullet that biases the spool 47 in the right direction in FIG.
SOL is a solenoid, and by passing electric current,
The spool 47 is moved to the left in FIG. 3 against the ammunition 51. The structure and operation of the solenoid SOL are the same as those commonly used, so a detailed explanation will be omitted here.
When the spool 47 is at position a, which is moved to the right as shown in FIG.
Further, when the piping 41 is at position b, which is moved to the left, the piping 41 communicates with a piping 57 that communicates with the emergency operation valve 21.

FIG. 4 shows the emergency operation valve 21, which is constructed as follows. That is, 59 is a spool that is slidably provided within the valve body 61, 63 is a bullet that biases the spool 59 in the right direction in FIG.
5 is an emergency lever. As shown in FIG. 4, when the spool 59 is moved to the right position a, the pipe 57 communicating with the electromagnetic on-off valve 19 and the pipe 69 communicating with the compressor 67 are communicated with each other. Further, when the spool 59 is at position b, which is moved to the left in FIG. 4, the pipe 57 communicates with the communication hole 71 that opens to the atmosphere.

FIG. 5 shows the emergency automatic valve 23, and the piping 5
It is provided branching off from 7 and is configured as follows. That is, 73 is a valve body fixed to a pipe 75 branching from the pipe 57, and 77 is a fusible piece held in the valve body 73 by a lid 79, which melts when heated to a predetermined temperature and connects the pipe 75 to the atmosphere. It is connected to.

FIG. 7 shows the air circuit, and FIG. 8 shows the electric circuit. The solenoid SOL of the electromagnetic on-off valve 19 is set to SOL-1, SOL-2, SOL- according to the order of arrangement of the first, second and third tank chambers 19, 19, 19.
3. Similarly, the operation switches S and S' are S-1, S-2, S-3 and S'-1, S'-2, S'-3 in the order of the tank chamber 19, and are push button type for connecting current. and the current cut-off push button type, and are distinguished by the numerals a and b, respectively. That is, Sa-1, Sa-2, Sa-3 are connection switches on the top of the tank, Sb-1, Sb-2, Sb-3 are disconnection switches on the top of the tank, S'a-1, S'a-2, S′a−
3 is the connection switch at the bottom of the tank, S′b-1, S′b-
2, S'b-3 indicates a cut-off switch installed at the bottom of the tank. In addition, two connection switches
Sa-1 and S'a-1 are arranged in parallel in the electric circuit that connects and maintains the current to the electromagnetic on-off valve 19, and Sb-1 and S'b-1 are the currents of the electromagnetic on-off valve 19. One connection switch Sa-1 and one disconnection switch Sb are arranged in series in an electric circuit that disconnects the
-1 is installed in a high place such as the top of the tank, and the other connection switch S'a-1 and the other disconnection switch S'b-1 are installed.
and are placed in a position where they can be operated on the ground. Furthermore, r-1, r-2, r-3 and r'-1, r'-2,
r'-3 are relays R-1, R-2, R-3 respectively
The contact point 81 is a battery.

The compressor 67 and the air tank 25 are also used for the air brake of the chassis 3.

In the above embodiment, when opening the bottom valve 13 of the first tank chamber 9, the connection switch Sa-1 or S'a-1 at the top or bottom of the tank 5 is used.
When the circuit is connected by pressing , relay R-1 is energized, contact r'-1 is connected and holds itself, and contact r-1 is connected and solenoid SOL-1 is activated.
is energized and switches the electromagnetic on-off valve 19 from position a to position b. Therefore, the air is generated by the compressor 67, the air tank 25, the emergency operation valve 21
The pressurized air sent through is sent to the cylinder part 39 of the bottom valve 13, and is pushed against the piston 37 against the bullet 45.
is pushed up, the valve body 31 separates from the valve seat 35, the bottom valve 13 opens, and the liquid in the tank chamber 9 is discharged from the pipe 15 via the discharge valve 17. To close the bottom valve 13, press the connection switch Sb-1 or S'b-1 at the top or bottom of the tank 5 to disconnect the circuit, which cuts off the current in the relay R-1 and closes the contact r'-
1 is disconnected and the self-holding is released, contact r-1 is disconnected and the current of SOL-1 is cut off, the electromagnetic on-off valve 19 is returned from the position b to the position a by the elastic mechanism 51, and the cylinder part The air in the valve 39 is pushed out by the bullet 45 via the piston 37 and released into the atmosphere from the communication hole 55 of the electromagnetic on-off valve 19, and the bottom valve 13 is closed. Similarly, the second and third tank chambers 9
The bottom valve 13 can be opened and closed.

In addition, in the event of an emergency such as a fire occurring while the bottom valve 13 is opened to drain the liquid, operating the emergency lever 65 in the direction of arrow A in Fig. 4 will move the emergency operation valve 21 from position a to position b. Since the electromagnetic on-off valve 19 is in position b, the air in the cylinder part 39 of the bottom valve 13 passes through the electromagnetic on-off valve 19 and enters the emergency operation valve 2.
1 into the atmosphere from the communication hole 71 of the bottom valve 13.
will be closed. If there is a fire in the vicinity of the emergency operation valve 21 and the emergency operation valve 21 cannot be operated, the fusible piece 77 of the automatic emergency valve 23 will melt and the air in the cylinder part 39 of the bottom valve 13 will be discharged from the automatic emergency valve 21. 23 to the atmosphere, and the bottom valve 13 closes.

Since the present invention has the configuration as described in the claims, the number of expensive operation valves and fluid piping can be reduced, and assembly can be easily performed and manufactured at low cost. The bottom valve can be opened and closed.

9 and 10 show other embodiments,
An emergency operation switch 83 and an emergency automatic switch 85 are used instead of the emergency operation valve and the emergency automatic valve. That is, the emergency operation switch 83
is a manual switch that cuts off the current to the electromagnetic on-off valve 19 in the event of an emergency, and an automatic emergency switch 85 automatically cuts off the current to the electromagnetic on-off valve 19 using a thermostat or the like when it is heated to a predetermined temperature or higher. Also included in the automatic emergency switch of the present invention is one that interrupts the current using a fuse that is melted by heat.

To explain the effects in FIGS. 9 and 10,
When connection switch Sa-1 is pressed, relay R-1 is energized, contacts r-1 and r'-1 are connected, and SOL-1 is connected.
is energized, the electromagnetic on-off valve 19 of the first tank chamber 9 is switched from the a position to the b position, and the bottom valve 13 is in an open state. If a fire breaks out in this state, operating the emergency operation switch 83 to cut off the current will cut off the current in relay R-1, cancel the self-holding of contact r'-1, and release contact r'-1.
-1 is shut off, the electromagnetic on-off valve 19 returns from the b position to the a position, the air in the cylinder part 39 of the bottom valve 13 is released to the atmosphere from the communication hole 55 of the electromagnetic on-off valve 19, and the bottom valve 13 is closed. do. Further, when the automatic emergency switch 85 is activated due to the heat of the fire, the relay R-1 is similarly de-energized and the bottom valve 13 is closed. As described above, if an emergency operation switch or an emergency automatic switch is used instead of an emergency operation valve or an emergency automatic valve, the cost of the components will be lower, and a part of the air piping can be replaced with electrical wiring. It can be easily assembled and the manufacturing cost can be reduced.

In the embodiments shown in Figures 1 to 8, the bottom valve is opened by pneumatic pressure and a two-position electromagnetic opening/closing valve is used. However, hydraulic pressure may be used for the fluid pressure, and electromagnetic opening/closing A three-position valve may also be used, all of which belong to the present invention.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of drawings]

Fig. 1 is a side view of a tank truck equipped with an embodiment of the present invention, Fig. 2 is a side sectional view of the bottom valve, Fig. 3 is a side sectional view of the electromagnetic shut-off valve, and Figs. 4 and 5 are respectively 6 is a side view of the operation switch, FIG. 7 is a fluid circuit diagram of an embodiment of the present invention, FIG. 8 is an electric circuit diagram of the same, and FIG. 9 is a side sectional view of the emergency operation valve and automatic emergency valve.
The figure is a fluid circuit diagram of another embodiment, and FIG. 10 is an electric circuit diagram of the same. (Explanation of the symbols representing the main parts of the drawing) 5
...tank, 13 ... bottom valve, 19 ... electromagnetic on-off valve, 45 ... ammunition, 83 ... emergency operation switch,
85...Emergency automatic switch, Sa-1, S'a-1...
...Connection switch, Sb-1, S'b-1...Disconnection switch.

Claims (1)

[Scope of Claims] 1. In a tank truck equipped with a bottom valve 13 that is opened by fluid pressure against the ammunition 45, an electromagnetic on-off valve 19 is provided to control the fluid pressure that opens the bottom valve 13. , the electromagnetic on-off valve 19
Two connection switches Sa-1 and S′a-1 are arranged in parallel in the electric circuit that connects and maintains the current to disconnect switch Sb-1, S'b-1
are arranged in series, and the connection switches Sa-1, S′a
-1, one of the connection switches Sa-1, and one of the disconnection switches Sb-1 and S'b-1, the disconnection switch Sb-1, are installed in a high place such as the upper part of the tank. A bottom valve operating device for a tank truck, characterized in that the other connection switch S'a-1 and disconnection switch S'b-1 are arranged at positions where they can be operated on the ground. 2. The electromagnetic on-off valve 19 is provided so as to be returned to its original position by a bullet 51 when the electric current is cut off, and an emergency operation switch 83 for cutting off the electric current of the electromagnetic on-off valve 19 is installed on the cut-off switch.
The bottom valve operating device for a tank truck according to claim 1, which is provided at an appropriate position separately from Sb-1 and S'b-1. 3 The electromagnetic on-off valve 19 is provided so as to be returned to its original position by a bullet 51 when the current is cut off, and the electromagnetic on-off valve 1 is turned on by sensing a predetermined temperature.
Emergency automatic switch 85 for interrupting the current of 9
The bottom valve operating device for a tank truck according to claim 1, wherein the bottom valve operating device for a tank truck is provided at an appropriate position.