JPS61223382A - Emergency closing device for bottom valve in tank truck - Google Patents

Abstract

PURPOSE:To stop discharge of liquid through closing of a bottom valve, by a method wherein, when a fire occurs during unloading, an air pressure is exhausted by burning or dissolving a combustible or soluble material. CONSTITUTION:A plug body 44, formed by an easily-soluble material easily dissolved when temperature is increased to a given value, is mounted to the open hole part of a branch pipe part 42 installed this side of an emergency valve 10. The emergency valve 10, when a fire occurs during the feed of oil, enables simultaneous closing of bottom valves 4 from a position situated away from a discharge valve 9. Further, when a worker can not make access to an emergency opening device 11 due to a fire, the plug body 44 is dissolved to exhaust air in a piping 8 to the open air, and bottom valve control valves 5 and 6 are changed over to automatically close all the bottom valves 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention also relates to a device for quickly closing a bottom valve in a tank truck, which is equipped with a bottom valve that is pneumatically opened against a repellent.

[Prior art and problems to be solved] Conventionally, in the emergency closing device of the bottom valve of this type of tank truck, when a fire occurs when unloading the dangerous liquid loaded in the tank, To close all bottom valves and stop discharging, simultaneously close and lock all bottom valves in a position at the rear of the tank away from the discharge valve on the side of the tank to which the discharge bow is connected. An emergency lever is provided, but if a fire breaks out near this emergency lever, the flammable or easily soluble material placed near the lever will burn or melt, causing the energized The plectrum that was blocking the horns was activated, activating the emergency lever and closing all the bottom valves at the same time.The flammable or easily soluble material blocked the biasing force. □A configuration in which the emergency lever is mechanically operated by a plucked strip: The structure is complicated and cannot be manufactured at low cost, and in addition, a strong plucked strip is required to operate the emergency lever quickly and reliably. This required a large structure, and in order to block the invading forces, great strength was required, making assembly difficult.

[Means and operations for solving the problem] 'The present invention provides a system in which a pneumatic actuator for a bottom valve is connected to a pneumatic source through a bottom valve operation valve, and the pneumatic actuator and the pneumatic source are connected to each other. Provide a branch pipe section that branches from the air pipe between the air pipe and communicates with the atmosphere.
This branch pipe is closed with a flammable or easily soluble material, and if a fire occurs during unloading of hazardous liquids, this flammable or easily soluble material will burn or melt and the pressure will be released. is released into the atmosphere and the bottom valve is closed, stopping the discharge of liquid.

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

Figure 1 is an overall view of a tank lorry to which the present invention has been applied. In the figure, 1 is the tank body, 2, ... are partition plates for configuring tank compartments, and 3, ... are provided on the canopy of each tank compartment. 4, ... are the bottom valves of each tank compartment, 5 is the bottom valve operation valve on the bottom side of the tank, 6 is the bottom valve operation valve on the top side of the tank, 7, ... is the bottom valve 4 on the pneumatic pressure A part of the cylinder attached to each bottom valve (air actuated device) to operate it at
, 8 indicates the above-mentioned air piping, 9 indicates a discharge valve, 10 indicates an emergency valve, and 11 indicates an emergency opening device disposed in front of the emergency valve 10, respectively.

, FIG. 6 is a pneumatic piping circuit diagram of an apparatus of the present invention which employs a system in which the bottom valve operating valve is held in two positions and is held in either switching position.

In the figure, 12 is an air pressure source such as a compressor, 13 is an air tank, and 14... is a display device such as a buzzer or lamp that senses the pressure in the circuit, which is preferably attached to the circuit behind each operating valve. When the bottom valve operation valves 5 and 6 mentioned above are in the A position, air is supplied to the rear circuit connected to the cylinder part 7,
In the position, the air in the rear circuit is released to the outside, and the switching operation part is integrated with an actuation body (piston) that is biased in one direction by a strip provided in the pilot operation part, as shown schematically in the figure. The state at the time of one-way biasing is the above-mentioned B position, and the actuating body (piston)
The A position is the state in which the actuating body (piston) is moved against the plucked stripes due to air pressure acting on the rear side.

The rear circuits of the upper and lower operation valves of the tank are connected to the cylinder part 7 after merging with each other, and there is only one emergency release device 11, an emergency valve, and a pneumatic emergency release device 10. 3 = t in the part, and after joining via the check valve 15,..., they are connected, and each operating valve is mutually connected to the pilot operating part of the corresponding operating valve. It is something.

In this embodiment, as described above, the back side circuits of the operation valves for different bottom valves are communicated with each other through the check valve 15, so that the reverse operations performed simultaneously on the different bottom valves are In other words, even if air pressure is released with the operation valve of the bottom valve 1 and air is injected with the operation valve of the adjacent bottom valve, the presence of the check valve 15 prevents the injected air from flowing into the open and release circuit. There will be no problem like that.

In addition, since they communicate with each other to the pilot making parts of the other operating valves, when one operating valve is manually moved to the A position, air pressure is generated behind the pilot operating part (actuating body (piston)) of the other operating valve. When one operating valve is manually set to the 8 position, the air after physical training in the actuating body (piston) of the pilot operating part of the other operating valve is also released, and the position is automatically set to B. become a position. In other words, when either one is switched, the other is also switched at the same time.

The device of the present invention having the above configuration allows any operation to be performed independently without any hindrance or restriction to the previous operation even if the operation valve on either the upper or lower side of the tank is operated. It can be done by taking In addition, 16 in the figure shows a throttle valve.

Next, the mechanism of the above-mentioned bottom valve operating valve will be explained with reference to FIG.

That is, in the three-way pipe joint 20, there are an opening 21 for connection to the air tank 13 side, an opening 22 for connection to the circuit behind the operation valve, and an opening 23 for connection to the atmosphere side. Further, the valve body 24 is provided with a communication bending passage 25 and a hand rod 26 is installed therein.

The B position is the state in which the apertures 22 and 23 are connected, and when the hand rod 26 is rotated to the left, the apertures 22 and 23 are connected.
This is the A position in which the aperture 21 and the aperture 21 are in communication with each other.

The cylinder integral 27-a of the above-mentioned pyro actuation-actuation part 27
is pivotally supported on a number base 28, and its actuating body (piston) 7
The two piston rod bodies of No. 0 are pivotally fixed to the hand rod 26 to form the above-mentioned integral relationship.

Further, the piston actuating portion 27 is provided with a reel 27-C, which presses and biases the actuating body (piston) 70 in the right direction in the figure.

The mechanism of the emergency valve 10 described above will be explained with reference to FIG.

In the two-way pipe joint 35, a connection hole 36 is provided on the circuit side of the cylinder part 7, and a connection hole 37 is provided on the atmosphere side, and the valve body 38 is provided with a straight connection hole 36. A passage 39 is bored and a hand rod 40 is planted.

The illustrated communication passage 3 in which the hand rod 40 is represented by a solid line
9 is in the closed position, which is inconsistent with both openings 36 and 37;
The hand rod 40 is always held in this position by the tensile force of the rod 711 fixed to the hand rod 40, and the hand rod 40 is rotated to the right against the rod 41 to open the communication passage 39 on both sides. 36.
37, an emergency release of air is effected.

The emergency release device 11 mentioned above will be explained with reference to FIG.

This is made by attaching a stopper made of an easily soluble material that melts easily when it reaches a predetermined temperature to the opening of a branch pipe section 42 attached in front of the emergency valve 10. In the case of Fig. B, a plug 44 formed in a plate shape is attached to the opening step 43 by pressing with a cylindrical retaining screw 45, and in the case of Fig. B, a plug configured as a screw is attached to the opening. 46 is installed.

In the event of a fire during refueling, the above-mentioned emergency valve 10 can close each bottom valve at the same time at a location apart from the discharge valve 9, and also has an emergency opening device 1.
1 is a fire that prevents workers from approaching, and the stopper body 44 melts and releases the air in the pipe 8 to the atmosphere. Therefore, all the actuating bodies 70 are moved to the right in FIG. When the bottom valve operating valves 5 and 6 are moved to the B position, all the bottom valves 4 are automatically closed by a plucked strip 52, which will be described later.

The previously mentioned cylinder part 7 (air actuated device) (the bottom valve mechanism of the J installation will be explained with reference to FIG. 6).

The figure shows an example in which a cylinder part 7 is installed in a tank. In the figure, 47 is an opening provided at the bottom of each tank compartment, to which a flange 48 is welded, and the discharge An intervening pipe joint 49 is flanged to communicate with the pipe leading to the valve 9.

The diameter of the pipe joint 49 is set to be smaller than that of the opening 47, and in order to serve as a valve seat, it protrudes slightly, and the valve body 50 is attached to it by the force of the old thread, etc. It is in contact with.

The cylinder part 7 connects its piston rod end to the valve body 50.
The valve body 50 is attached to the valve body 50 to move the valve body 50 in the valve opening direction using air pressure against the aforementioned biasing force.

That is, a pedestal 51 is fixed to the flange portion of the pipe joint 49, and a part of the cylinder 7 is placed on top of the pedestal 51, which is indicated by 52 in the figure.
Reference numeral 53 indicates a strip between the top plate of the pedestal 51 and the valve body 50 to press and bias the intervening valve element; 53 indicates a communication hole provided in the side wall of the pedestal 51;
54 is a piston, 55 is a piston rod, and 56 is a communication hole provided through the piston rod 55. When filling the tank compartment from the pipe joint 49 with a pump, the pipe joint 49
The internal pressure is guided to the upper part of the piston 54 to balance the pressure applied to the valve body 50.

The piping 8 is connected to the lower part of the cylinder, and air is press-fitted to the lower side of the piston 54 and the piston rod 55
is raised against the plucked strips 52 to open the valve body 50.

[Effects of the Invention] As described above, since the present invention has the configuration as described in the claims, it is possible to automatically and reliably close the bottom valve when a fire occurs during unloading of dangerous liquids. Moreover, it has a simple structure, can be made small, can be manufactured at low cost, and does not require a large hole for assembly.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a tank truck equipped with a device according to the present invention, Fig. 2 is a piping circuit diagram of the device of the present invention, Fig. 3 is a front cross-sectional view of a bottom valve operation valve, and Fig. 4 is an emergency release device. FIG. 5 is a side sectional view of the emergency valve, and FIG. 6 is a front sectional view of the bottom valve.

Claims (1)

[Claims] In a tank truck equipped with a bottom valve 4 that is operated to open by air pressure against a plectrum 52, a pneumatic actuator 7 for the bottom valve 4 is provided in communication with an air pressure source 12 via bottom valve operating valves 5 and 6, A branch pipe section 42 is provided which branches off from the air pipe between the air actuation device 7 and the air pressure source 12 and communicates with the atmosphere, and the branch pipe section 42 is closed with a flammable or easily soluble material. An emergency closing device for a bottom valve in a tank truck, characterized by: