JPH09221199A - Unloading device for tank lorry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent discharge of oil vapor in the case where oil vapor in an underground tank is not recovered to a hatch concerned owing to an error in connecting a hose. SOLUTION: On unloading oil stored in a tank lorry 21, unloading hoses 12, 13 are connected respectively to oil inlets 10, 11 of underground tanks 1 and outlets 25, 26 of the tank lorry 21, and vapor recovery hoses 18, 19 are connected respectively to three-way valves 8, 9 and connecting parts 30, 31 of vapor recovery lines 28, 29 of the tank lorry 21. As transmitting parts 14-17 are connected to connectors 48 of the unloading hoses 12, 13 while tank lorry side connectors 36 are connected to the unloading hoses 12, 13 and connectors 45 of the vapor recovery hoses 18, 19, signals pertaining to oil kinds and underground tank numbers are transmitted from the transmitting parts 14-17 to an unloading computer 35. The unloading computer 35 allows a hatch concerned to operate for unloading when agreement between the oil kind and the underground tank number is confirmed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank lorry vehicle unloading device for unloading an oil liquid in a hatch of a tank lorry vehicle to a tank at a gas station.

[0002]

2. Description of the Related Art A tank truck is generally used as a delivery means for delivering an oil liquid from an oil depot to a gas station or the like. The tank of a tank truck is divided into a plurality of hatches. Each hatch has gasoline for the first hatch, light oil for the second hatch, and kerosene for the third hatch according to the order of the delivery destination. In particular, it is possible to load oil liquids of different oil types for each hatch. Therefore, when the tank truck arrives at the gas station at the delivery destination, the worker looks at the nameplate, etc., installed near the fuel inlet of the tank installed at the gas filling station and confirms that the oil type of the tank is, for example, gasoline. . After that, connect one end of the oil supply hose to the discharge port that communicates with the bottom opening / closing valve of the first hatch of the tank truck, and connect the other end to the oil inlet provided in the tank for gasoline. Unloading is performed by opening the bottom opening / closing valve of the hatch. Hereinafter, the same operation is performed when unloading light oil and kerosene.

When the oil liquid in the hatch of the tank truck is unloaded in the tank at the gas filling station in this way, oil vapor (vapor) is generated in the tank and the pressure in the tank rises. Therefore, in the tank, in order to smoothly unload the oil liquid, the pressure of the tank upper part and the oil vapor must be released to the outside as the liquid level rises. Therefore, an oil vapor discharge pipe line for discharging oil vapor to the outside is connected to the tank of the gas station.

[0004] This oil vapor discharge pipe line extends upward, for example, so as to have a predetermined height at the corner of the gas filling station, and is provided so as to discharge the oil vapor generated in the tank of the gas filling station into the atmosphere. ing. In addition, when refueling the fuel tank of the vehicle, while pumping up the oil liquid in the tank with the pump,
Since the liquid level in the tank drops, negative pressure is generated in the tank. In that case, the outside air is supplied to the tank via the oil vapor discharge pipe line to prevent the upper pressure in the tank from being maintained at the atmospheric pressure and prevent the load on the pump from increasing.

However, in such a structure, if the oil vapor is discharged into the atmosphere as it is, the atmosphere is polluted. Therefore, in the conventional unloading device of a tank truck, the oil vapor generated in the tank of the gas station is used. Was adopted in the hatch of the tank truck.

[0006]

When the oil vapor generated when the oil liquid in the hatch of the tank truck is unloaded into the tank of the gas station as described above is collected in the hatch of the tank truck, the tank truck is used. The vehicle operator connects the unloading hose to the hatch's oil supply port and the tank's oil filler port, then connects the oil vapor recovery hose to the oil vapor discharge line and the hatch's oil filler port, Allow oil vapor to be collected in the hatch.

When connecting the unloading hose and the oil vapor recovery hose in this way, the hatch and the tank must be of the same oil type, and the oil vapor discharge pipeline of the tank must be connected to the hatch. . However, when connecting the oil vapor recovery hose, the oil vapor recovery hose may be mistakenly connected to the oil vapor discharge conduit of another tank. In that case, the oil vapor generated in the tank being unloaded will be released into the atmosphere, and since the oil vapor from the tank will not be introduced into the hatch of the tank truck, the hatch will be unloaded as it progresses. There is a problem that the inside becomes negative pressure, and the oil liquid cannot be unloaded, or the hatch is dented due to the pressure difference with the surrounding atmospheric pressure.

Therefore, an object of the present invention is to provide an unloading device for a tank truck that solves the above problems.

[0009]

In order to solve the above problems, the present invention has the following features. The present invention, when unloading the oil liquid loaded in the hatch of the tank truck to the tank via the unloading hose, installs an oil vapor recovery hose in the oil vapor discharge pipe line for discharging the oil vapor generated in the tank. In the unloading device of the tank truck that connects the oil vapor generated in the tank and circulates it to the hatch of the tank truck, in order to identify the tank to the connection portion of the tank to which the unloading hose is connected A tank detection means is provided, and an oil vapor discharge pipeline detection means for identifying the tank corresponding to the oil vapor discharge pipeline to which the oil vapor recovery hose is connected is provided, and the tank detection is performed via the unloading hose. When the tank detected by the means and the tank detected by the oil vapor discharge conduit detecting means through the oil vapor recovery hose coincide with each other, from the hatch to the tank It is characterized in that a control means for permitting unloading is provided.

Therefore, according to the present invention, when the tank detected by the tank detection means through the unloading hose and the tank detected by the oil vapor discharge line detection means through the oil vapor recovery hose coincide with each other. In order to allow the unloading of the hatch to the tank, the oil vapor generated in the tank can be collected in the hatch being unloaded, and if the oil vapor recovery hose is connected incorrectly, the hatch can be unloaded. Therefore, it is possible to reliably prevent the oil vapor generated in the tank from being discharged into the atmosphere due to the unloading of the oil liquid.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of the unloading device for a tank truck according to the present invention. In the basement of the gas station,
Underground tanks 1 and 2 with different oil types are buried. For example, the underground tank 1 is a tank for gasoline, and the underground tank 2
Is provided as a tank for light oil. In the present embodiment, the case of unloading the oil liquid to the underground tanks 1 and 2 will be described as an example, but it is also applicable to the case of unloading to the aboveground tank instead of the underground tanks 1 and 2. Needless to say.

The underground tanks 1, 2 are supplied with oil liquid from a tank truck, and the underground tanks 1, 2
Oil vapor discharge conduit 6, which discharges the oil vapor generated inside
7 are provided. The oil vapor discharge lines 6 and 7 are
When refueling the fuel tank of a vehicle, the negative pressure in the underground tanks 1 and 2 is reduced by introducing the outside air into the tank as the liquid level drops.

Further, the tip ends of the oil vapor discharge pipe lines 6 and 7 stand up at the corners of the gas station and extend to a predetermined height, and the exhaust ports 6a and 7 are formed.
a is provided, and three-way valves 8 and 9 are provided in the middle of the oil vapor discharge pipelines 6 and 7. These three-way valves 8 and 9
It has vapor recovery ports 8a and 9a, and is normally exhaust ports 6a and 7a.
a is communicated with the underground tanks 1 and 2, and the vapor recovery ports 8a and 9a are switched and communicated with the underground tanks 1 and 2 only when the oil liquid is unloaded.

Further, it is detected that the unloading hoses 12 and 13 are connected to the lubrication ports 10 and 11 of the underground tanks 1 and 2 provided at the upper ends of the lubrication pipelines 4 and 5, respectively. Sending section (underground tank detecting means) 14, 1 for sending the underground tank code number and oil type data set for each 1, 2
5 are provided. In addition, in the unloading hoses 12 and 13,
Signal lines 12a and 13a for transmitting signals from the transmission units 14 and 15 to the tank truck vehicle side are provided.

In addition, the vapor recovery ports 8a of the three-way valves 8 and 9,
In the vicinity of 9a, the underground tank code number set for each oil vapor discharge pipeline 6 and 7 is transmitted to identify each underground tank 1 and 2 connected to each oil vapor discharge pipeline 6 and 7. Transmitters (oil vapor discharge pipeline detecting means) 16 and 17 are provided. The vapor recovery hoses 18 and 19 are provided with signal lines 18a and 19a for transmitting signals from the transmitters 16 and 17 to the tank truck vehicle side.

Reference numeral 21 denotes a tank truck, which has a plurality of hatches 2
It has a tank 22 partitioned into 2a to 22g. Plural types of oil liquids are loaded in the plurality of hatches 22a to 22g according to the order of the delivery destination. For example, the first to third hatches 22a to 22c are light oil and the fourth to seventh hatches. 22d ~
22 g is loaded with different oil types such as gasoline.

At the bottoms of the hatches 22a to 22g, bottom opening / closing valves 23a to 23g are provided which are opened when the oil liquid loaded in the hatches 22a to 22g is unloaded. Of the bottom opening / closing valves 23a to 23g, the bottom opening / closing valves 23a to 23a arranged on the front side (driver's side) are numbered 1 to 3.
23c is connected in parallel to the first discharge port 25. Further, among the bottom opening / closing valves 23 a to 23 g, the fourth to seventh bottom opening / closing valves 23 d to 23 g arranged on the rear side are connected in parallel to the second discharge port 26.

Further, on the upper portions of the hatches 22a to 22g,
The vapor from the vapor recovery hoses 18, 19 is hatched 22
Vapor recovery conduits 28 and 29 for returning to the fuel filler ports 27a to 27g of a to 22g are provided. One vapor recovery pipeline 28 is connected to the fuel filler ports 27a to 27c of the first to third hatches 22a to 22c arranged on the front side (driver's side), and the other vapor recovery pipeline 29 is connected to the rear. No. 4 to No. 7 hatches 22d to 22g arranged on the side
d to 27 g.

At the ends of the vapor recovery pipelines 28 and 29, the connection ports 3 to which the vapor recovery hoses 18 and 19 are connected are connected.
0, 31 are provided. And the connection ports 30, 31
Communication connectors 32 and 33 are provided in the vicinity of. The connectors 32 and 33 are connected via a signal line 34 to a unloading computer 35 provided in the driver's seat of the tank truck 21.

Further, near the discharge ports 25, 26, communication connectors 36, 37 are provided. The connectors 36 and 37 are connected to the tank truck 2 via a signal line 38.
It is connected to the unloading computer 35 provided in the first driver's seat. Further, the unloading computer 35 is connected to a ground wire 40 that is connected to a grounding device 39 at the gas station.

The memory of the unloading computer 35 is shown in FIG.
A vapor recovery pipeline data table in which is registered the discharge port numbers of the discharge ports 25 and 26 and the vapor recovery pipeline numbers of the oil vapor discharge pipelines 6 and 7 corresponding to each hatch number of the hatches 22a to 22g as shown in FIG. 51 is stored. In the memory of the unloading computer 35, the underground tank number and the oil vapor recovery hoses 18, 19 detected by the transmitting units 14, 15 as underground tank detecting means via the unloading hoses 12, 13 will be described later. When the underground tank numbers detected by the transmission units 16 and 17 as the oil vapor discharge line detecting means are matched with each other, a control program for allowing the unloading of the hatches 22a to 22g to the underground tanks 1 and 2 is input. Has been done.

Further, the unloading computer 35 is connected to a card reader 35a for reading vehicle number data stored in a vehicle number card (not shown) of the tank truck 21 and a liquid crystal display 35b. Figure 3 shows unloading hose 1
It is a figure which shows the structure of 2,13.

In the unloading hoses 12 and 13, a tubular connecting fitting 42 is press-fitted into one end of an oil resistant hose 41, and the discharge port 2 of the tank truck 21 is connected to the end of the connecting fitting 42.
A nut 43 is provided which is screwed to the screws 5, 26. Further, the connection fitting 42 includes connectors 36, 3 of the signal line 38.
A connector 45 to which 7 is connected is provided.

At the other end of the hose 41, a tubular connecting fitting 4
6 is press-fitted, and a screw portion 47 that is screwed into the oil supply ports 10 and 11 of the underground tanks 1 and 2 is provided at the end of the connection fitting 46. Further, the connection fitting 46 has a lubrication port 1
A connector 48 to which the transmitters 14 and 15 provided near 0 and 11 are connected is provided. And hose 4
A signal line (not shown) for electrically connecting the connectors 45 and 48 at both ends is provided on the outer periphery or the thick portion of 1.

The vapor recovery hoses 18 and 19 have the same construction as the unloading hoses 12 and 13, and the same parts as those of the unloading hoses 12 and 13 are designated by the same reference numerals and the description thereof will be omitted. FIG. 4 is a perspective view showing the configuration of the transmission units 14 and 15.

The transmitters 14 and 15 have three contacts 51a to 5 in a housing 50 having a trapezoidal end surface.
1c is provided, a first resistor 52a having a resistance value according to the oil type is provided between the contactor 51a and the contactor 51b, and the underground tank 1 is provided between the contactor 51a and the contactor 51c. , 2 is provided.

The transmitters 14 and 15 have plug insertion holes 50a to 50c on the end surface of the housing 50, and contacts 51a to 51c are provided at the back of the plug insertion holes 50a to 50c. Therefore, the transmitters 14 and 15 are used for the unloading hose 1
When connected to the connector 48 of No. 2, the current from the connector 48 flows to the contactor 51a, and the voltage generated by the resistors 52a and 52b serves as a signal for identifying the oil type and the underground tank from the contactor 51b and 51c to the connector 48 side. Sent to.

As described above, in this embodiment, the resistors 52a, 5
The oil type and the underground tank can be identified by the voltage set by the resistance value of 2b.
The number of signal lines is smaller than that of the configuration in which the combination of bit signals is used for identification, and the configurations of the transmission units 14 and 15 can be simplified and downsized.

The housing 50 is provided with a chain 53 to lubricate the oil 1
Since it is connected in the vicinity of 0 and 11, the transmission units 14 and 1
5 is prevented from being lost, or the transmitting units 14 and 15 are prevented from being replaced with each other. In addition, the oil vapor discharge pipeline 6,
7 three-way valves 8, 9 connected by a chain 53 to a transmitter 16, 1
7 has the same configuration as the transmitting units 14 and 15 described above,
Detailed description is omitted.

FIG. 5 is a view showing a state in which the unloading hose 12 is connected to the oil supply port 10 of the underground tank 1 and the discharge port 25 of the tank truck 21. When unloading the oil liquid loaded on the tank truck 21, the threaded portion 47 of the unloading hose 12 is screwed into the oil inlet 10 of the underground tank 1, and the nut 43 is screwed into the outlet 25.

Then, the connector 36 on the tank truck vehicle side
Is connected to the connector 45 of the unloading hose 12, and the transmitter 14 on the underground tank side is connected to the connector 4 of the unloading hose 12.
8 is connected to the resistor 52 provided in the transmitter 14.
Voltages corresponding to the resistance values of a and 52b are transmitted to the unloading computer 35 as an oil type signal (oil type data) and a tank signal (tank code number) for identifying an underground tank.

The unloading hose 13 is connected in the same manner as the unloading hose 12 described above. FIG. 6 shows a vapor recovery hose 18
The three-way valve 8 and the vapor recovery line 2 of the tank truck 21
It is a figure which shows the state connected to the connection port 30 of FIG. Before unloading, the screw portion 47 of the vapor recovery hose 18 is screwed into the connection portion 8a of the three-way valve 8, and the vapor recovery hose 18
The nut 43 of the tank with the vapor recovery line 2 of the tank truck 21.
It is screwed into the connection port 30 of 8.

Then, the connector 36 on the vehicle side of the tank truck
Is connected to the connector 45 of the vapor recovery hose 18 and the transmitter 16 of the oil vapor discharge conduit 6 is connected to the connector 48 of the vapor recovery hose 18, the resistors 52a and 52b provided in the transmitter 16 are connected. A voltage corresponding to the resistance value is transmitted to the unloading computer 35 as an oil type signal and a tank signal for identifying the underground tank.

The vapor recovery hose 19 is connected in the same manner as the vapor recovery hose 18. Here, the unloading process executed by the unloading computer 35 will be described with reference to the flowchart of FIG.

When the tank truck 21 arrives at the gas filling station, the driver inserts the vehicle number card into the card reader 35a, and the type and quantity of oil loaded in each of the hatches 22a to 22g.
Check the delivery name, etc. And the unloading hoses 12, 13
Also, the work for connecting the vapor recovery hoses 18, 19 is performed. When the work of connecting the vapor recovery hoses 18 and 19 is completed, the three-way valves 8 and 9 are switched to connect the oil vapor discharge conduits 6 and 7 with the vapor recovery hoses 18 and 19, and the exhaust port 6 is connected.
The valves a and 7a are closed.

The unloading computer 35 operates in step S1.
(Hereinafter, “step” is omitted), card reader 35a
The vehicle number data stored in the vehicle number card of the tank lorry vehicle 21 inserted in is read. Based on this vehicle number data, data such as the oil type, quantity, delivery destination name, etc. loaded in each hatch 22a to 22g is read from the memory.

In the next step S2, it is determined whether or not the connection of the unloading hoses 12 and 13 is completed. The driver attaches the threaded portion 47 of the unloading hoses 12 and 13 to the oil filling port 1 of the underground tanks 1 and 2.
After the nut 43 is screwed into the discharge ports 25 and 26 of the tank truck 21, the discharge port 2
5, the connector 36 provided on the load hose 12,
13 is connected to the connector 45, and the lubrication ports 10 and 11 are connected.
The transmitters 14 and 15 provided in the
Connector 48.

As a result, the signals of the oil type (oil type data) and the tank number (tank code number) of the underground tanks 1 and 2 are transmitted from the transmitting units 14 and 15 to the unloading computer 35. Therefore, in S2, when the signals of the oil type and the tank number are supplied from the transmitters 14 and 15, the unloading hose 1
It is determined that the connections of 2 and 13 are completed.

In the next step S3, the oil types of the underground tanks 1 and 2 connected by the unloading hoses 12 and 13 and the hatches 22a.about.
It is determined whether or not the oil type is equal to 22 g. Here, when the oil types of the underground tanks 1 and 2 connected by the unloading hoses 12 and 13 do not match the oil types of the hatches 22a to 22g, the process proceeds to S4 and an alarm is issued and the liquid crystal display 35b is displayed. Display a message such as “Incorrect unloading hose connection”.

Further, in S3, the unloading hoses 12, 1
Oil type and hatch 2 of underground tanks 1 and 2 connected by 3
When the oil types 2a to 22g match, it is determined that the unloading hoses 12 and 13 are correctly connected, and the process proceeds to S5. In S5, it is determined whether or not the connection of the vapor recovery hoses 18, 19 is completed. Before unloading, the driver screw-engages the screw portion 47 of the vapor recovery hoses 18 and 19 with the connection portions 8a and 9a of the three-way valves 8 and 9, and the nuts 43 of the vapor recovery hoses 18 and 19 of the tank truck 21. After being screwed into the connection ports 30 and 31 of the vapor recovery pipelines 28 and 29, the tank truck vehicle-side connector 36 is connected to the connector 45 of the vapor recovery hoses 18 and 19, and the transmitter 16 of the three-way valves 8 and 9 is connected. , 17, vapor recovery hoses 18, 1
9 to the connector 48.

As a result, the signals of the oil type (oil type data) and the tank number (tank code number) of the oil vapor discharge pipelines 6 and 7 are transmitted from the transmitting units 16 and 17 to the unloading computer 35. Therefore, in S5, when the signals of the oil type of the oil vapor discharge pipelines 6 and 7 and the underground tank number are supplied from the transmission units 16 and 17, it is determined that the connection of the vapor recovery hoses 18 and 19 is completed.

In the next S6, from the vapor recovery pipeline data table 51 shown in FIG. 2, the discharge outlet numbers of the discharge outlets 25 and 26 corresponding to each hatch number and the vapor recovery pipelines of the oil vapor discharge pipelines 6 and 7 are shown. Read the number and based on these data, the underground tanks 1 and 2 to which the unloading hoses 12 and 13 are connected
It is determined whether or not the numbers of the oil vapor discharge pipelines 6 and 7 corresponding to the above and the numbers of the vapor recovery pipelines 28 and 29 match. Here, the numbers of the oil vapor discharge pipelines 6 and 7 and the vapor recovery pipeline 2
If the numbers 8 and 29 do not match, the process proceeds to S7, an alarm is issued, and a message such as "connection error of vapor recovery hose" is displayed on the liquid crystal display 35b.

Further, in S6, the oil vapor discharge pipeline 6,
When the number 7 and the numbers of the vapor recovery pipelines 28 and 29 match, it is determined that the vapor recovery hoses 18 and 19 are correctly connected, and the process proceeds to S8. In S8, the unloading hoses 12 and 13 are correctly connected, and the vapor recovery hose 1
8 and 19 are also correctly connected, and the unloading hoses 12 and 1
The underground tank number detected by the transmitters 14 and 15 via the transmitter 3 and the transmitter 1 via the oil vapor recovery hoses 18 and 19.
It is determined that the underground tank numbers detected from Nos. 6 and 17 match, and the unloading from the hatch to the underground tanks 1 and 2 is permitted.

Then, in S9, the hatches 22a to 22g are
Of the bottom opening / closing valves 23a-23g provided at the bottom of the hatch, the bottom opening / closing valve of the hatch in which the oil liquid of the gas station is loaded, for example, the bottom opening / closing valve 23a of the first hatch 22a and the bottom opening / closing valve of the fourth hatch 22d. Only 23d is opened.

Thus, the oil liquid of the first hatch 22a is unloaded to the underground tank 1, and the oil liquid of the fourth hatch 22d is unloaded to the underground tank 2. In this way, the oil liquid is unloaded to the underground tanks 1 and 2 and
The liquid level inside rises, and oil vapor (vapor) collects in the upper part of the underground tanks 1 and 2.

Then, the oil vapor (vapor) in the underground tanks 1 and 2 passes through the oil vapor discharge pipelines 6 and 7 and the three-way valve 8
9, the three-way valve 8,9 to vapor recovery hose 18,1
9 and flows into the vapor recovery pipes 28 and 29. In the first hatch 22a and the fourth hatch 22d during unloading,
Since the liquid level descends, the upper space becomes a vacuum, and the air in the vapor recovery pipelines 28, 29 is sucked. Therefore, the vapors recovered from the underground tanks 1 and 2 are unloaded through the vapor recovery pipelines 28 and 29 to the first hatches 22a and 4h.
It is sucked into the oil supply ports 27a and 27d of the numbered hatch 22d.

At this time, since the connection of the vapor recovery hoses 18 and 19 is confirmed, the oil vapor of light oil in the underground tank 1 is definitely recovered in the first hatch 22a for light oil, and the gasoline oil in the underground tank 2 is recovered. The steam is collected in the fourth hatch 22d for gasoline. Therefore, it is possible to reliably prevent the oil vapor (vapor) in the underground tanks 1 and 2 from being released into the atmosphere. Further, due to a hose connection error, the oil vapor of the underground tanks 1 and 2 is not collected in the hatches 22a and 22d during unloading, negative pressure is generated in the hatches 22a and 22d, and the wall surfaces of the hatches 22a and 22d are dented. Hatch 22a,
It is possible to prevent that the oil liquid cannot be unloaded from 22d.

In the next step S10, it is confirmed that the oil liquid in the hatch currently being unloaded is unloaded in the underground tanks 1 and 2. That is, the completion of the unloading is detected by comparing the measured value from the liquid level sensor (not shown) provided in the underground tanks 1 and 2 with the quantity of the oil liquid loaded in the hatch.

When it is confirmed that the oil liquid of the hatch currently being unloaded is unloaded in the underground tanks 1 and 2, the process proceeds to S11, in which the bottom opening / closing valve 23 of the first hatch 22a is opened.
a and the bottom opening / closing valve 23d of the fourth hatch 22d are closed, and "unloading is completed" is displayed on the liquid crystal display 35b.
Is displayed.

At the next step S12, it is determined whether or not the transmitters 14 and 15 provided at the oil inlets 10 and 11 are disconnected from the connector 48 of the unloading hoses 12 and 13. After the unloading is completed, the driver disconnects the connectors 36 provided at the discharge ports 25 and 26 from the connectors 45 of the unloading hoses 12 and 13,
Moreover, the transmitters 14 and 15 provided at the oil supply ports 10 and 11 are disconnected from the connectors 48 of the unloading hoses 12 and 13. After that, the unloading hoses 12 and 13 are connected to the oil supply ports 10 and 11 of the underground tanks 1 and 2 and the discharge ports 25 and 26 of the tank truck 21.
Remove from

As described above, in S12, the transmitting unit 14,
When 15 is disconnected from the connector 48 of the unloading hoses 12 and 13, it is determined that the unloading hoses 12 and 13 are disconnected, and the process proceeds to S14. However, in S12, the transmission unit 14,
When 15 is not disconnected from the connector 48 of the unloading hoses 12 and 13, the unloading hoses 12 and 13 are not disconnected, so the process proceeds to S13, an alarm is issued and "Forgetting to remove the unloading hose" is displayed on the liquid crystal display 35b. Is displayed.

At the next step S14, the transmitter 1 of the three-way valves 8 and 9 is
6 and 17 are connectors 48 of the vapor recovery hoses 18 and 19
It is determined whether it has been removed from. After the unloading is completed, the driver sets the transmitters 16 and 17 to the vapor recovery hoses 18 and 19
After disconnecting from the connector 48 of
19 is removed from the three-way valves 8 and 9 and the vapor recovery pipelines 28 and 29 of the tank truck 21.

In this way, in S14, the transmitting unit 16,
When 17 is disconnected from the connector 48 of the vapor recovery hoses 18 and 19, it is determined that the vapor recovery hoses 18 and 19 are disconnected, and the process proceeds to S16. However, in S14,
When the transmitters 16 and 17 are not disconnected from the connectors 48 of the vapor recovery hoses 18 and 19, the vapor recovery hose 1
Since Nos. 8 and 19 have not been removed, the process proceeds to S15, where an alarm is issued and a message such as "Forgetting to remove the vapor recovery hose" is displayed on the liquid crystal display 35b.

Then, in S15, it is judged whether or not all the unloading is completed, and if the unloading is still left, the tank truck 21 is moved to the location of another underground tank and the above S2 and the following steps are performed. The process of is executed. However, when all unloading of the gas station is completed, a series of unloading control is ended.

In the above embodiment, the case where the oil liquid is unloaded to the underground tank of the gas station has been described as an example, but the present invention is not limited to this, and the oil liquid is unloaded to the underground tanks provided in other places. Of course, it can be applied to the case. Further, in the above embodiment, the transmitters 14 and 15 provided in the oil inlets 10 and 11 are connected to the connectors 48 of the unloading hoses 12 and 13, and the transmitters 16 and 17 of the three-way valves 8 and 9 are connected to the vapor recovery hose. Although it was confirmed that the underground tanks of the oil vapor discharge pipelines 6 and 7 and the unloading hoses 12 and 13 are connected by connecting to the connectors 48 of 18 and 19, and the underground tanks match, Transmitter 1 like the example
Instead of 6, 17, it is also possible to use a transmitter having another shape and other configuration.

As the transmission unit, a wireless transmission unit may be used instead of the wired transmission unit to transmit the identification data such as the number of the underground tank.

[0057]

As described above, according to the present invention, the tank detected by the tank detection means via the unloading hose and the tank detected by the oil vapor discharge conduit detection means via the oil vapor recovery hose. If the hatches match, the unloading from the hatch to the tank is permitted, so that the oil vapor generated in the tank can be collected in the hatch being unloaded, and if the connection of the oil vapor recovery hose is incorrect, the hatch Therefore, it is possible to reliably prevent the oil vapor generated in the tank from being discharged to the atmosphere due to the unloading of the oil liquid. In addition, it is possible to prevent the oil vapor in the tank from being collected in the hatch being unloaded due to a hose connection error, resulting in negative pressure in the hatch and denting of the hatch, and inability to unload the oil liquid from the hatch. .

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram for explaining an embodiment of an unloading device for a tank truck according to the present invention.

FIG. 2 is a conceptual diagram of a vapor recovery pipeline data table stored in a memory.

FIG. 3 is a diagram showing a configuration of an unloading hose.

FIG. 4 is a perspective view showing a configuration of a transmission unit.

FIG. 5 is a diagram showing a state in which an unloading hose is connected to an oil filling port of an underground tank and a discharge port of a tank truck.

FIG. 6 is a diagram showing a state in which a vapor recovery hose is connected to a three-way valve and a connection port of a vapor recovery pipeline of a tank truck.

FIG. 7 is a flowchart of an unloading process executed by an unloading computer.

[Explanation of symbols]

 1, 2 Underground tank 6, 7 Oil vapor discharge line 8, 9 Three-way valve 10, 11 Oil inlet 12, 13 Unloading hose 14-17 Transmitting part 18, 19 Vapor recovery hose 21 Tank truck 22a-22g Hatch 23a-23g Bottom opening / closing valve 25,26 Discharge port 27a-27g Refueling port 28,29 Vapor recovery line 35 Unloading computer 45,48 Connector

Claims (1)

[Claims] 1. An oil vapor recovery hose in an oil vapor discharge conduit for discharging the oil vapor generated in the tank when unloading the oil liquid loaded in the hatch of the tank truck vehicle through the unloading hose. In the unloading device of the tank truck that recirculates the oil vapor generated in the tank to the hatch of the tank truck by identifying the tank, in order to identify the tank to the connection portion of the tank to which the unloading hose is connected. Tank detection means is provided, and oil vapor discharge pipeline detection means for identifying the tank corresponding to the oil vapor discharge pipeline to which the oil vapor recovery hose is connected is provided, and the tank is provided via the unloading hose. When the tank detected by the detection means and the tank detected by the oil vapor discharge conduit detection means through the oil vapor recovery hose coincide with each other, from the hatch to the tank A unloading device for a tank lorry, which is provided with control means for permitting unloading to and from the vehicle.