JP3116342B2 - Overflow prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

This invention has a plurality of hatches,
The discharge port of each hatch relates to an overflow prevention device when lubricating from a lorry connected to a discharge pipe via a bottom valve to a tank installed at a gas station and having a level gauge.

[0002]

2. Description of the Related Art As is well known, various techniques for reliably preventing overflow when unloading, that is, lubricating, a tank from a lorry to a filling station are known, and the present applicant has also disclosed, for example, JP-A-1-226592. In the gazette, a technique for preventing oil mixture and overflow was proposed.

[0003] However, according to the prior art, the alarm is reported and the worker performs the closing operation of the bottom valve.
Operation delay or erroneous operation may occur. Further, in the above-mentioned known technique, since the connector of the lorry is connected to the connector of the gas station, it is troublesome and troublesome.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an overflow preventing device which can automatically and reliably prevent overflow during lubrication.

[0005]

According to the overflow preventing device provided at a gas station and a lorry according to the present invention, a plurality of hatches are provided, and a discharge port of each hatch is connected to a discharge pipe via a bottom valve. In the overflow prevention device when lubricating a tank having a liquid level gauge installed at a gas station from a lorry, the gas station receives a signal from the liquid level gauge and determines that the tank is full. A control device and a wireless transmitter for transmitting a full signal from the control device are provided, and an air supply pipe connected to the open / close drive unit of each of the bottom valves provided on the lorry is provided via a first solenoid valve. Receiving means for receiving a signal from a radio transmitter at the gas station, the air supplying main pipe being connected to an air tank via a second solenoid valve, Receive signal from receiving means Indicating operation unit, and an interface box for receiving a signal from a control unit of the display operation unit, wherein the second solenoid valve outputs a signal output when the receiving unit receives a full signal from the wireless transmitter. And the first solenoid valve is configured to be closed by a signal output from the interface box when the full signal is input to the control unit.

The control unit of the display operation unit has a function of outputting a valve opening / closing signal of the first solenoid valve to the interface box in response to a valve opening / closing input from a keyboard of the display / operation unit.

When the receiving means does not receive the full signal, the control unit of the display operation unit closes the second electromagnetic valve with respect to the interface box, and activates the second electromagnetic valve in response to the unloading end signal. It has the function of outputting a signal to close the valve.

The first and second solenoid valves are three-way solenoid valves which open the air supply pipe when the valve is opened and open the air supply pipe to the atmosphere when the valve is closed.

[0009]

Therefore, when the liquid level gauge of the tank detects "full", the controller outputs a full level signal to the wireless transmitter by a signal from the level gauge. When the receiving means receives the full signal, the second solenoid valve closes immediately.
Since air pressure is no longer supplied to the opening / closing drive of the bottom valve, the bottom valve closes, and as a result, overflow can be prevented. That is, the full signal from the control device is
A command to close the second solenoid valve is issued to the valve drive unit of the solenoid valve, and the valve closing command is transmitted directly to the second solenoid valve, which is extremely preferable in terms of safety.

At the same time, the full signal is input to the control unit of the display operation unit, and the control unit outputs a valve closing signal to the interface box, so that the second solenoid valve is closed.
Therefore, a double safety device is configured, and it is safe even if the signal line is broken. In a normal operation, the control unit outputs a valve opening / closing signal to the interface box in response to a valve opening / closing input from a keyboard of the display / operation unit.
Therefore, the interface box receives the valve opening / closing signal set by the keyboard and opens / closes the first solenoid valve, so that the bottom valve of each hatch is opened / closed according to the valve opening / closing signal, and a predetermined unloading is performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, a plurality (one in the example of FIG. 1 and two in the example of FIG.
) Oil storage tanks T1 and T2 are buried. These tanks T1 and T2 have liquid level gauges 1a and 1b, respectively.
And lubrication pipes 2a and 2b. Level gauge 1
a and 1b are respectively connected to a control device 3 provided in the office S, and a wireless transmitter 4 and a display 5 are connected to the control device 3 respectively.

On the other hand, the tank truck R is provided with a plurality (three in the example of FIG. 1) of hatches H1 to H3 (hereinafter, collectively referred to as H), and the discharge pipe 10a of each of the hatches H1 to H3. , 10b (FIG. 2 shows only two), the discharge pipes 22 are respectively connected via bottom valves V1, V2.
The discharge pipe 22 is connected to an oiling hose 21 via a coupling. The open / close drive units 11a and 11b of these bottom valves V1 and V2 are connected to the main air supply pipe L from the air tank 13 via the first solenoid valves 12a and 12b by air supply pipes L1 and L2. The second solenoid valve 14 is connected to the air supply main pipe L.
Is interposed.

The bottom valves V1 and V2 are provided with an open / close drive unit 11.
a, 11b open when air is supplied, and close when air supply is cut off. The first solenoid valves 12a and 12b are formed of three-way solenoid valves. The first solenoid valves 12a and 12b are opened when energized and air flows, and when not energized, the outflow side is opened to the atmosphere. Similarly, the second solenoid valve 14 is also formed of a three-way solenoid valve, which is opened when energized to connect the air supply main pipe L to the air tank 13, and closed when not energized to close the air supply main pipe L to the atmosphere. Open to the public.

The tank truck R is provided with a radio receiver 15 as a receiving means. The radio receiver 15 is connected to the valve driving section 1 of the second solenoid valve 14 via a line L3.
The display operation unit 4a is connected to a display operation unit indicated by reference numeral 16 as a whole via a line L4.

The display operation unit 16 is provided with a control unit 17 having a keyboard 18 and a display unit 19.
An interface box 20 is connected to the control unit 17. The first electromagnetic valves 12 a and 12 b and the second electromagnetic valve 14
And are connected respectively. Accordingly, the second solenoid valve can be directly closed from the receiver 15 via the line L3, and can be opened and closed via the interface box 20 by a signal from the control unit 17 as described later. Then, the first solenoid valves 12a and 12b are opened and closed by a signal from the interface box 20.

Next, the mode of lubrication will be described.

The tank truck R enters the gas station S and connects the lubrication hose 21 to, for example, an oil storage tank T1. Then, the user operates the keyboard 18 to input, for example, the opening / closing of the bottom valve V1 of the hatch H1. Then, the control unit 17 outputs an unloading start signal from the interface box 20, opens the second solenoid valve 14 and, for example, the first solenoid valve 12a,
The bottom valve V1 opens to inject the oil of the hatch H1, outputs the unloading end signal, closes the second solenoid valve 14 and the first solenoid valve 12a, closes the bottom valve V1, and stops oiling. .

At this time, if the tank T1 becomes full before the output of the unloading end signal due to an erroneous operation of the keyboard or other causes, the control device 3 becomes full based on the signal from the level gauge 1a. Then, the wireless transmitter 4 outputs a full signal. Then, the second electromagnetic valve 14 closes to open the air supply main pipe L to the atmosphere side according to the full signal received by the wireless receiver 15, and the control unit 17 controls the first electromagnetic valve via the interface 20. The valve 12a is switched to the atmosphere side. Therefore, the bottom valve V1 is immediately closed by the double operation of closing the second solenoid valve 14 and the first solenoid valve 12a, and the overflow is automatically and reliably prevented.

[0020]

As described above, according to the present invention, the following excellent effects can be obtained. (1) Since the full tank signal from the control unit of the gas station directly closes the second solenoid valve, the operation is quick and safe. (2) Since the full tank signal is input from the control unit of the display operation unit to the interface box and the second solenoid valve is closed, the safety is doubled. (3) The work of connecting the lorry and the gas station with signal lines or the like is unnecessary and convenient.

[Brief description of the drawings]

FIG. 1 is a side view of a tank lorry and a gas station showing one embodiment of the present invention.

FIG. 2 is a control block diagram implemented in the present invention.

[Explanation of symbols]

 H: Hatch L1, L2: Air supply pipe L: Air supply main pipe R: Tank lorry S: Gas station T: Oil storage tank V: Bottom valve 1a, 1b ...・ Liquid level meter 2a ・ ・ ・ Oil pipe 3 ・ ・ ・ Control device 4 ・ ・ ・ Wireless transmitter 5 ・ ・ ・ Display device 10a, 10b ・ ・ ・ Oil feed pipe 11a, 11b ・ ・ ・ Opening / closing drive section 12a, 12b ・..First solenoid valve 13 ... Air tank 14 ... Second solenoid valve 15 ... Wireless receiver 16 ... Display operation unit 17 ... Control unit 18 ... Keyboard 19 ... Indicator 20 ・ ・ ・ Interface box 21 ・ ・ ・ Lubricated hose

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B67D 5/00-5/70

Claims (4)

(57) [Claims] 1. A hatch having a plurality of hatches, and a discharge port of each hatch is lubricated from a lorry connected to a discharge pipe via a bottom valve to a tank installed at a gas station and having a level gauge. In the overflow prevention device, a filling station is provided with a control device that receives a signal from the liquid level gauge and determines that the tank is full, and a wireless transmitter that transmits a full tank signal from the control device. The air supply pipe connected to the open / close drive unit of each bottom valve provided on the lorry is connected to the air supply main pipe via a first solenoid valve, and the air supply main pipe is connected to the second
Receiving means for receiving a signal from a radio transmitter of the gas station, a display operating unit for receiving a signal from the receiving means, and a display operating unit for receiving the signal from the receiving station. An interface box for receiving a signal from a control unit, wherein the second solenoid valve closes with a signal output when the receiving means receives a full signal from the wireless transmitter, and the first solenoid valve Is configured to be closed by a signal output from the interface box when the full signal is input to the control unit, wherein the overflow prevention device is provided at a gas station and a lorry. 2. The overflow prevention device according to claim 1, wherein the control unit of the display operation unit has a function of outputting a valve open / close signal of the first solenoid valve to the interface box in response to a valve open / close input from a keyboard of the display / operation unit. . 3. The control unit of the display operation unit closes the second solenoid valve with respect to the interface box when the receiving means does not receive the full signal, and upon receiving the unloading end signal, the second solenoid valve. The overflow prevention device according to claim 1, further comprising a function of outputting a signal for closing the valve. 4. The overflow prevention device according to claim 1, wherein the first and second solenoid valves are three-way solenoid valves that open the air supply pipe when the valve is opened and open the air supply pipe to the atmosphere when the valve is closed.