JPH11301799A - Unloading device of tank lorry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of overflow at the time of unloading oil loaded in a hatch of a tank lorry to an oil feeder station tank. SOLUTION: An unloading computer 35 of a tank lorry 21 is connected with an outdoor liquid level display section 30 through a communication cable 36. As the outdoor liquid level display section 30 is connected with a liquid level control panel 33 through an SS-LAN 32, various kinds of data displayed on the liquid level control panel 33 are transmitted in lumpsum to the unloading computer 35. When the unloading computer 35 is connected with unloading hoses 17 and 18 and then unloading is instructed and the kind of oil in a hatch conforms to the kind of oil in underground tanks and also the loading volume in the hatch is less than the empty capacity of the underground tanks, the unloading to the hatch for which unloading is instructed is allowed, while when the loading volume in the instructed hatch is more than the empty capacity of the underground tanks, the unloading is prohibited to prevent the overflow in the underground tanks 11 (1-n).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unloading device for a tank lorry configured to prevent an overflow when unloading an oil liquid loaded on a hatch of a tank lorry.

[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. Then, when the tank truck arrives at the delivery destination gas station, the driver looks at the nameplate and the like provided near the lubrication port of the underground tank installed at the gas station and finds that the oil type of the underground tank is gasoline, for example. Confirm.

[0003] When the oil in the hatch of the tank truck is unloaded to the underground tank at the filling station in this way, it is necessary to confirm that the oil type is the same, and to check the display of the liquid level gauge of the underground tank. Confirm that the unloadable free space is less than or equal to the unloading hatch capacity. Then, when the oil type of the hatch matches the oil type of the underground tank and the hatch capacity is smaller than the free capacity of the underground tank, unloading becomes possible. In that case, the driver connects one end of the unloading hose to the discharge port of the hatch and connects one end of the unloading hose to the lubrication port of the underground tank.

[0004] After that, the bottom valve of the hatch is opened, and the oil liquid loaded in the hatch is unloaded to the underground tank through the unloading hose. In this way, the unloading of the oil liquid delivered to the tank truck is performed, and the accident of mixing different oil types and the overflow at the time of unloading are prevented. Also,
Conventionally, as an apparatus for preventing overflow at the time of unloading, as described in Japanese Patent Publication No. 6-84198, for example, the hatch capacity of a tank truck is compared with the free capacity of an underground tank to permit unloading. A configuration having an in-vehicle control device that performs the control is disclosed. In this publication, after connecting a vehicle-mounted control device of a tank truck and a control device installed in an office of a gas station via a communication cable, the free capacity and oil type of an underground tank connected to an unloading hose are determined. Read. Then, compare the capacity and oil type of the hatch to which the unloading hose is connected with the free capacity and oil type of the underground tank,
Unloading is only permitted if the oil types match and the hatch capacity is less than the free capacity of the underground tank.

Another conventional example is disclosed in, for example, JP-A-5-278797. In this publication, a wireless level gauge is provided in an underground tank, and the on-board controller of the tank truck compares the free space of the underground tank with the capacity of the hatch from the measurement value transmitted from the wireless level gauge. Unloading is only permitted if the hatch capacity is smaller than the free capacity of the underground tank.

Further, as another conventional example, as disclosed in Japanese Patent Publication No. 6-51515, for example, a lubrication port connected to an unloading hose by a liquid amount management device installed on the gas station side. Some air valves open and close to the underground tank. In this publication, when the residual oil level in the underground tank detected by the liquid level detector provided in the underground tank reaches the capacity of the underground tank, the solenoid valve in the air pipe is opened to supply air to the air valve. By closing the air valve, the unloading to the underground tank is stopped to prevent overflow.

[0007]

However, the above described underground tank to be unloaded must be connected via a communication cable to a vehicle-mounted control device of a tank truck and a control device installed in an office of a gas station. Could not be specified, and overflow could not be prevented unless there was a control device at the gas station.

Therefore, it is necessary to provide a control device and a lubrication port sensor at a gas station and to lay a signal line between the control device and the lubrication port sensor, thereby increasing capital investment on the gas station side.
The economic burden on the gas station is large. Also, the above
It is necessary to install a wireless liquid level gauge in the underground tank of the gas station, which increases capital investment on the gas station side and puts a large economic burden on the gas station side.

Further, in the above-described apparatus, equipment such as a liquid amount management device, an air pipe, a solenoid valve, and an air valve must be installed on the gas station side. The economic burden on the side is large. Therefore, an object of the present invention is to provide an unloading device for a tank lorry vehicle that solves the above problem.

[0010]

In order to solve the above problems, the present invention has the following features. The present invention provides a hatch loading amount storing means for storing an amount of liquid loaded on each hatch of a tank truck, and an oil mounted on each hatch based on the hatch loading amount storing means mounted on the tank truck. An on-board controller for managing the unloading of the liquid, and an unloading device for a tank lorry having the on-board controller, wherein the on-board controller is connected to a data output unit of a liquid level gauge provided near a filling port of a gas station tank. Tank capacity reading means for collectively reading empty capacity that can be unloaded into each tank; identification means for identifying a tank connected to the tank lorry via an unloading hose; and oil in each hatch of the tank lorry. Hatch instructing means for instructing a hatch for unloading the liquid; a loading amount of the hatch indicated by the hatch instructing means from the hatch capacity storing means; Comparing means for reading the empty capacity of the tank identified by the identifying means via the reading means and comparing the empty capacity of the tank with the hatch loading amount; and loading the hatch based on the comparison result of the comparing means. An unloading prohibition unit for prohibiting unloading from the hatch when the amount is larger than the free capacity of the tank.

Therefore, according to the present invention, the loading amount of the hatch indicated by the hatch instructing means and the empty capacity of the tank identified by the identifying means via the tank capacity reading means are read from the hatch capacity storing means, If the hatch capacity is larger than the free capacity of the tank based on the result of comparing the empty capacity of the tank and the loading capacity of the hatch, an unloading prohibition unit that prohibits unloading from the hatch is provided.
The overflow at the time of unloading can be prevented without changing the equipment at the gas station.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an unloading device for a tank truck of the present invention. As shown in FIG. 1, the underground gas station, a plurality of underground tanks 11 ₁ to 11 _n of different types of oil are embedded. For example, underground tank 1
1 ₁ in the tank for the "gasoline", underground tank 11 ₂ is provided as a tank for the "light oil".

In this embodiment, the underground tank 11 ₁
To 11 but it will be described as an example the case of unloading the hydraulic fluid to _n, also a matter of course be applied to the case of unloading the ground-tank instead of underground tanks 11 ₁ to 11 _n. Underground tank 11 ₁ to ~11 _n tank lorry vehicle 21
Oil line 13 ₁ to ₁ from which the oil liquid delivered by the oil is discharged
3 _n are provided. In addition, lubrication pipelines 13 _{1 to} 13 _n
Of the oil port 15 ₁ to 15 _n of each feature under tank 11 ₁ to 11 _n provided at the upper end, the underground tanks 11 ₁ after the hose 17, 18 unloading from tank truck vehicle 21 has connected
Data plug 19 for obtaining an underground tank code number and an oil type of data set in each ~11 _{n 1} ~19 _n
Is provided. In addition, unloading hoses 17 and 18 have
Signal lines 17a and 18a for obtaining data of the data plugs 19 _{1 to} 19 _{n on} the tank truck 21 side are provided.

Each of the underground tanks 11 _{1 to} 11 _n has a liquid level gauge 28 _{1 to} 28 for measuring the amount of stored oil.
_n has been inserted. The liquid level gauges 28 _{1 to} 28 _n correspond to the respective underground tanks 11 ₁ to 11 installed in the offices of the gas stations.
It is connected to a level gauge control panel 33 for managing the 1 _n oil liquid storage amount. The level gauge control panel 33 is connected to the lubrication ports 15 ₁ to 15 ₁ through the SS-LAN 32 formed of a serial line.
15 _n is connected to the outdoor liquid level display unit 30 installed in the vicinity.

The outdoor liquid level display unit 30 is provided so that an operator can check the condition of the underground tank at the site when unloading, and displays the measured oil amount data (liquid level). An output terminal (not shown) for outputting is provided. The tank truck 21 has a plurality of hatches 22.
It has a tank 22 partitioned into a to 22 g. A plurality of types of oil liquids are loaded in the plurality of hatches 22a to 22g in accordance with the order of the delivery destination.
2a to 22c have "light oil", 4th to 7th hatch 22d
~ 22g are loaded with different oil types such as "gasoline".

At the bottom of each of the hatches 22a to 22g, there are provided air-driven bottom opening / closing valves 23a to 23g which are opened when unloading the oil liquid loaded in each of the hatches 22a to 22g. The bottom closing valve 23a~23g usually are closed, the oil type and free space of the underground tank 11 ₁ to 11 _n to be unloaded is identified as described below, the air pressure signal is supplied The valve is configured to open.

The first to third bottom opening / closing valves 2 disposed on the front side (driver's seat side) of the bottom opening / closing valves 23a to 23g.
3 a to 23 c are connected in parallel to the first discharge port 25. The fourth to seventh bottom opening / closing valves 23d to 23g disposed on the rear side among the bottom opening / closing valves 23a to 23g are connected to the second discharge port 26 in parallel. Further, at the upper portions of the hatches 22a to 22g, oil supply ports 27a to 27g in which the oil liquid is loaded at the oil tank station are provided. Each of the hatches 22a to 22g is provided with a hatch liquid level meter 34a to 34g for measuring the remaining amount of the oil liquid. The hatch level meters 34a to 34g are used to check the remaining amount of each of the hatches 22a to 22g when unloading the oil liquid of one hatch in a so-called sizing method in which the oil liquid is unloaded in a plurality of times. You.

An unloading computer 35 is mounted near the tank 22 of the tank truck 21 as an in-vehicle control device for performing unloading control, as will be described later.
The unloading computer 35 may be installed in the driver's seat of the tank truck 21 or the like. The unloading computer 35 also displays a card reader 35a that reads the vehicle number data stored in the vehicle number card (not shown) of the tank truck 21 and displays various data and specifies a hatch to be unloaded. And a liquid crystal display 35b of a touch panel type.

Further, the unloading computer 35 is connected to an output terminal of the outdoor liquid level display section 30 via a communication cable 36. Since the outdoor liquid level display unit 30 is connected to the liquid level gauge control panel 33 installed in the service station office via the SS-LAN 32, various data displayed on the liquid level gauge control panel 33 are collectively displayed. Then, it can be transmitted to the unloading computer 35.

Therefore, the driver does not need to connect the level gauge control panel 33 and the unloading computer 35, which are installed in the office of the gas station, with a communication cable.
Either the unloading computer oil port 15 ₁ to 15 _n outdoor liquid level display unit 30 installed in the vicinity of performing unloading 35
Is simply connected by the communication cable 36, so that the connection operation is simplified and there is no possibility that the communication cable 36 is pulled out by a vehicle passing through the gas station.

The unloading computer 35 can collectively read data (such as underground tank numbers, oil types, storage amounts, etc.) relating to all underground tanks installed at a gas station from the outdoor liquid level display unit 30. . The outdoor liquid level display 3
Since No. 0 has been conventionally installed at each gas station, there is no need to change the equipment on the gas station side, and it is not necessary to increase the economic burden on the gas station.

The grounding line 40 is connected to the unloading computer 35 before performing the unloading operation.
The tip of 0 is connected to a grounding device 39 of the gas station. FIG.
FIG. 4 is a diagram schematically showing a data table 51 stored in a memory of the unloading computer 35. As shown in FIG. 2, the hatch 22 is stored in the memory of the unloading computer 35.
discharge ports 25, 2 corresponding to each hatch number of a to 22g
6 and the valve number V of the bottom opening / closing valves 23a to 23g.
A data table 51 in which 1 to V7 are registered is stored. In the memory of the unloading computer 35, the underground tank number detected by the data plugs 14 and 15 as the underground tank detecting means via the unloading hoses 17 and 18 and the underground tank number specified for unloading are specified. When the oil type matches the hatch number, and the loading amount of the hatch is smaller than the free space of the underground tank 11, the unloading is permitted, and the loading amount of the hatch is larger than the free space of the underground tank 11. A control program for prohibiting unloading when the number is large and preventing overflow due to unloading is stored.

FIG. 3 is a configuration diagram of a pneumatic system mounted on a tank truck. In FIG. 3, the illustration of the oil-liquid system is omitted. As shown in FIG. 3, a pneumatic system 24 is mounted on the tank truck 21. The pneumatic system 24 includes a hatch 22a to 22h.
In order to safely unload the g oil solution, the tank truck 21
In consideration of the battery capacity, the bottom opening / closing valves 23a to 23g are driven to open by an air pressure signal instead of an electric signal.

The pneumatic system 24 includes a compressor 41
And an air tank 42 in which compressed air generated by the compressor 41 is accumulated, an air line 43 communicated with a discharge port of the air tank 42, an air line 43 and the bottom opening / closing valve 2.
A branch pipe 44a~44g communicating between the actuator portion 23a ₁ ~23g ₁ of 3A～23g, branch pipe 4
And electromagnetic valves 45a to 45g provided in 4a to 44g.

Each of the solenoid valves 45a to 45g is driven to open by a control signal from the unloading computer 35. That is, the unloading computer 35 connects the unloading hose 17,
18 is connected, the unloading is specified, the oil type of the hatch matches the oil type of the underground tank, and the specified hatch loading is less than the free capacity of the underground tank, the unloading specified hatch by opening the electromagnetic valve 45a~45g the corresponding number, the compressed air accumulated in the air tank 42 is supplied to the actuator portion 23a ₁ ~23g ₁ of the bottom closing valve 23a~23g unloading hydraulic fluid Allow

The unloading computer 35 determines whether the hatch specified for unloading does not match the oil type of the underground tank, or if the specified hatch loading is greater than the free space of the underground tank. At one time, the solenoid valves 45a to 45
g is not opened and unloading of the oil liquid is prohibited. Thus, it is possible to prevent different types of oil mixed accident and overflow accident in underground tanks 11 ₁ to 11 _n when unloading the hydraulic fluid in advance.

FIG. 4 is a view showing the structure of the unloading hoses 17, 18. As shown in FIG.
7 and 18, a tubular connection fitting 52 is press-fitted into one end of an oil-resistant hose 51, and a nut 53 screwed to the discharge ports 25, 26 of the tank truck 21 is provided at one end of the connection fitting 52. Have been. A connector 55 to which the connectors 46 and 47 of the signal line 48 are connected is connected to the connection fitting 52.
Is provided.

At the other end of the hose 51, a tubular fitting 5
6 are press-fitted, the end portion of the fitting 56 threaded portion 57 which is threaded into the oil port 15 ₁ to 15 _n of the underground tank 11 ₁ to 11 _n are provided. In addition, the connection fitting 56, the connector 58 is provided with oil port 15 ₁ to 15 _n data plug 19 ₁ ~ 19 _n provided in the vicinity of the are connected. A signal line (not shown) for connecting the connectors 55 and 58 at both ends is provided on the outer periphery or the thick portion of the hose 51.

FIG. 5 is a perspective view showing the configuration of a data plug 19 ₁ ~ 19 _n. As shown in FIG. 5, the data plugs 19 _{1 to} 19 _n are provided with three contacts 61 a to 61 c in a housing 60 having a trapezoidal end face, and the contacts 61 a and 61 b first resistor 62a having a resistance value corresponding to the type of oil is provided between the underground tank 11 ₁ is provided between the contact 61a and the contact 61c
A second resistor 62b having a resistance value according to 11 _n is provided.

Data plug 19₁~ 19_nThe house
The plug 60 has plug insertion holes 60a to 60c on its end face.
The contacts 61a-61 are located behind the lug insertion holes 60a-60c.
c is provided. Therefore, the data plug 19₁~
19_nIs connected to the connector 58 of the unloading hose 17.
Current flows from the connector 58 to the contact 61a,
Voltage generated by anti-62a, 62b is oil type, underground tank
Signals from the contacts 61b and 61c as signals for identifying
Is transmitted to the data 58 side. The data plug 19 ₁~ 19
_nThe surface of the housing 60 has a built-in resistor 62a,
The oil type and underground tank number corresponding to 62b are displayed.
Can be distinguished from other data plugs.
You.

As described above, in the present embodiment, the resistors 62a, 6
The oil type and the ground are determined by the voltage set by the resistance value of 2b.
4 bits or 6 because lower tank can be identified
Rather than identifying by a combination of bit signals
The number of signal lines is small and the data plug 19₁~ 19
_nCan be simplified and downsized. House
Ring 60 is connected to lubrication port 15 by chain 63.₁~ 15_nNeighborhood of
To the data plug 19₁~ 19_nBut
Lost or data plug 19 ₁~ 19_nEnters
It is prevented from being replaced.

[0032] FIG. 6 is a diagram showing a specific example of the data plug 19 ₁ ~ 19 _n resistor 62a, the resistance value of 62b. FIG.
As shown in (A), for example, the resistance 62a corresponding to the oil type
The resistance value of high-octane gasoline stored in the underground tanks 11 _{1 to} 11 _n is set to 8.2 KΩ, regular gasoline is set to 3 KΩ, and kerosene is 1.3.
It is set to KΩ, set to 470Ω for light oil, and set to 4.7KΩ for premium light oil.

As shown in FIG. 6 (B), for example, the underground tank number N
o. In the case of 1, the resistance value is set to 8.2 KΩ and the underground tank number is No. 2 is set to 3KΩ, and the underground tank number is No. 3 is set to 1.3 KΩ, and the underground tank number is No. 4 is set to 470Ω and the underground tank number is No. In the case of 5, it is set to 4.7 KΩ.

As described above, the data plugs 19 _{1 to} 19 _n
In the resistor 62a, it is possible to provide a signal corresponding to 62b oil type and the tank number to be stored in underground tanks 11 ₁ to 11 _n by the combination of the resistance values of the unloading computer 35. FIG. 7 shows the unloading hose 17 connected to the underground tank 1.
FIG. 2 is a diagram showing a state where the oil supply port is connected to a lubrication port 15 and a discharge port 25 of a tank truck 21;

As shown in FIG. 7, the tank truck 2
When unloading the oil liquid loaded in 1, the screw portion 57 of the unloading hose 17 is screwed into the lubrication port 15 of the underground tank 11 and the nut 53 is screwed into the discharge port 25 of the tank truck 21. . When the connector 46 of the tank truck is connected to the connector 55 of the unloading hose 21 and the data plug 19 of the underground tank is connected to the connector 58 of the unloading hose 21, a current flows from the unloading computer 35. Thus, the voltage corresponding to the resistance values of the resistors 62a and 62b provided in the data plug 19 is used as an oil type signal (oil type data) and a tank signal (tank code number) for identifying the underground tank.
5 given.

The unloading hose 18 is connected in the same manner as the unloading hose 17. FIG. 8 shows the underground tank 11 ₁
To 11 is a longitudinal sectional view showing a _n of liquid level. As shown in FIG. 8, for s underground tank 11 ₁ to 11 _n respectively, low alarm level from below according to the capacity of the whole tank, the actual liquid level, high alarm level, the overflow level is set level gauge control It is stored in the board 33. Therefore, when the liquid level fluctuates due to loading or unloading of the oil liquid, the liquid level gauges 28 _{1 to} 28 _n provided in the underground tanks 11 _{1 to} 11 _n indicate a liquid level signal corresponding to the liquid level at that time. Is output to the liquid level gauge control panel 33.

FIG. 9 is a diagram showing an example of various signals output from the liquid level gauges 28 _{1 to} 28 _n of the underground tanks 11 _{1 to} 11 _n . As shown in FIG. 9, the signals output from the level gauge control panel 33 to the unloading computer 35 include the free space of the underground tank, an upper limit alarm, a lower limit alarm, overflow, normal, a detector abnormality, and no corresponding tank. And so on.

The free space signal is a signal representing the space capacity obtained by subtracting the liquid level from the upper limit alarm level. The upper limit alarm signal is a signal that is output when the liquid level reaches a liquid level that is several percent lower than the nominal tank capacity.
The lower limit alarm signal is a signal that is output when the liquid level reaches a liquid level that is several percent higher than the nominal tank capacity.

The overflow signal is a signal that is output when the liquid level at the time of unloading reaches the tank nominal capacity value. The normal signal is a signal indicating a tank level value in a normal state. In addition, the detector abnormality signal is output from the liquid level meter 28.
_This signal is output when there is an abnormality in _{1 to} 28 _n .
The corresponding no-tank signal is a signal that is output when a failure is set.

Here, the unloading process executed by the unloading computer 35 will be described. FIGS. 10 and 11 are flowcharts for explaining the unloading process executed by the unloading computer 35. When the tank truck 21 arrives at the gas station, the driver puts the car number card on the card reader 3.
The type of oil, the quantity, the name of the delivery destination, and the like loaded into each hatch 22a to 22g by inserting it into the hatch 22a are confirmed. Then, the unloading hoses 17 and 18 are connected. Further, a communication cable 36 connects between the outdoor liquid level display unit 30 installed near the lubrication port 15 for unloading and the unloading computer 35.

The unloading computer 35 executes step S1.
1 (hereinafter, "step" is omitted) It is checked whether a power switch (not shown) is turned on. In step S11, when the power switch (not shown) is turned on, the process proceeds to step S12, and the driver connects the outdoor liquid level display unit 30 and the unloading computer 35 with the communication cable 36 mounted on the tank truck 21. Check if you have connected.

When it is confirmed in S12 that the connection between the outdoor liquid level display section 30 and the unloading computer 35 has been established, the flow proceeds to S13. In the next S13, it is checked whether the ground wire 40 is connected to the grounding device 39 of the gas station. In S13, the tank truck 21
Is connected to the grounding device 39 via the grounding wire 40, the process proceeds to S14.

In S14, a message such as "Do you want to read data from the liquid level gauge" is displayed on the liquid crystal display 35b of the unloading computer 35. Next S1
In step 5, when the touch key type "confirmation" button displayed on the liquid crystal display 35b is pressed, the process proceeds to S16, where information on all underground tanks is read via the communication cable 36 connected to the outdoor liquid level display unit 30. (Tank capacity reading means). As the data transferred from the outdoor liquid level display unit 30, the connection tank number, oil type of each underground tanks, the level gauge 28 ₁ ~ 28 _n status of each underground tanks, total volume of each underground tanks, Regions There is free space in the lower tank.

If it is determined in step S15 that the "confirm" button of the touch key type displayed on the liquid crystal display 35b is not pressed, the flow shifts to step S17, where the liquid crystal display 3
It is checked whether the touch-key type "cancel" button displayed in 5b has been pressed. In this S17, the touch key type "cancel" displayed on the liquid crystal display 35b.
When the button has been pressed, the process proceeds to S22 described later.

[0045] In S18, a message such as "Please press the confirmation key" with to display the information of each underground tank 11 ₁ ~11 _n of the liquid crystal display 35b read from the outdoor liquid level display unit 30 filling stations in the list Display. The display contents 71 such as a list of information of each underground tanks 11 ₁ to 11 _n, shown in FIG. 12 for example
Becomes

In the next S19, the liquid crystal display 35b
It is checked whether or not the "confirmation" button of the touch key type displayed in "1" is pressed. If the "confirmation" button is pressed in S19, the process proceeds to S20, in which the liquid crystal display 35b displays a list of hatch data of the loading oil type and quantity for each of the hatches 22a to 22g. Then, in S21, performs assignment processing of the data plug 19 ₁ ~ 19 _n. That is, the hatch data list has display contents 72 as shown in FIG. 13, for example. Then, based on the local under tank 11 ₁ to 11 _n information shown in FIG. 12, FIG. 14
As shown in (A), the tank number list 73 of the liquid level gauge is displayed.
As shown in FIG. 14B, the data plug list 7
4 and the allocation process is performed.

By this data plug assignment processing,
A number is assigned to each oil type, and the oil type list of the underground tank is rearranged so that the same oil type is displayed as a serial number. Therefore, oil port 15 _1-15 of each underground tanks 11 ₁ to 11 _n
n , the resistances 62a, 62
b is set not in the order of the tank number of each underground tank but in a state in which a number is assigned for each oil type.

As described above, when the information of each underground tank is assigned by the number of each oil type, the information of each underground tank can be viewed in the order of the oil type. Easy to grasp. For this reason, when performing the unloading operation, an operation error such as connecting the unloading hose 17 separately to the underground tank of the oil type hardly occurs. Also,
Data plug 19 ₁ ~ 19 _n is, since it is sufficient to prepare the each oil type, for example, when changing the type of oil underground tanks, since only increase the number of oil type, the manufacturer, for all underground tanks There is no need to prepare data plugs corresponding to all oil types in advance, and the production and management of data plugs are facilitated.

In the next S22, it is checked whether or not the hatch number of the hatch to be unloaded is specified (hatch instruction means). When the hatch number of the hatch to be unloaded is specified in S22, the process proceeds to S23. Next S2
In step 3, it is checked whether the hatch number of the touch key type displayed on the liquid crystal display 35b corresponding to the discharge port 25 to which the unloading hose 17 is connected and whether the unloading "start" button is pressed. In this S23, the "start" button is pressed, the process proceeds to S24, unloading is connected to the tank lorry vehicle 21 via the hose 17 to identify and the underground tank 11 ₁ hatch 22a specified hatch number (identification means), and compares the oil type and unloading hose 17 is connected underground tanks 11 ₁ of oil types of hatch 22a of grated specified load (comparison means).

In S25, the designated hatch 22a
Tank 11 to which the oil type and the unloading hose 17 are connected
_{When one} of the oil types are matched, the process proceeds to S26, loading amount loaded on the identified underground tanks 11 ₁ of the free space and the hatch 22a as described above (unloading weight) and read the underground comparing the loading amount of free space in the tank 11 ₁ and the hatch 22a.

[0051] Further, in S25, when the oil type and unloading hose 17 is connected underground tanks 11 ₁ of oil type of the specified hatch 22a do not match, the process proceeds to S27, consistent with the type of oil to unloading Check that the unloading hose 17 is connected to the lubrication port of another underground tank. And S
27, when the connection of the unloading hose 17 is changed,
Then, the process returns to step S23 to execute the processing from step S23. Further, as a result of comparing the unloading volume with the specified space of underground tanks 11 ₁ from the hatch 22a above S26, S28
In, when the amount of unloading from the hatch 22a is smaller than the free space of the underground tank 11 _1, the process proceeds to S29.

In S29, the solenoid valve 45a corresponding to the bottom opening / closing valve 23a of the designated hatch 22a is opened, and the bottom opening / closing valve 23a is driven to open by the air pressure signal supplied from the solenoid valve 45a. Accordingly, the hydraulic fluid of the hatch 22a is bottom-off valve 23a, is unloaded through the unloading hose 17 to the underground tank 11 _1. In S28, the unloading amount from the hatch 22a is reduced to the underground tank 11 _1.
If it is larger than the free space, the process proceeds to S30 to prohibit unloading, and informs the driver by an alarm and a display on the liquid crystal display 35b (unloading prohibition means). Accordingly, the bottom opening / closing valves 23a to 23g are kept closed by unloading.

[0053] Thus, when the amount of unloading from the hatch 22a is larger than the free space of the underground tank 11 _1, to inhibit unloading, the liquid level of the underground tank 11 during unloading is beyond the overflow level without put away, hydraulic fluid can be prevented from overflowing from the oil port 15 _1. Thereafter, the process proceeds to S31, where it is checked whether or not the unloading hose 17 has been connected to the underground tank 11 having an empty capacity larger than the specified hatch capacity. When the connection of the unloading hose 17 is changed to an underground tank having a free space larger than the hatch capacity to be unloaded in S31, the process returns to S23, and the processes after S23 are performed again to perform the oil type determination process. .

In S32, it is checked whether or not the measured value of the liquid level gauge 28 ₁ provided in the underground tank 11 ₁ has reached the upper limit alarm level. In S32, when the measured value of the liquid level gauge 28 ₁ provided in the underground tank 11 ₁ has not reached the upper limit alarm level, the process proceeds to S33, and the level gauge 28
Check if the measurement of ₁ has reached the overflow level. In S33, when the measured value of the level gauge 28 ₁ provided in the underground tanks 11 ₁ has not reached the overflow level, the process proceeds to S34, to check whether the abnormality in the level gauge 28 ₁ occurs.

[0055] In S34, when an abnormal value from the level gauge 28 ₁ (e.g., such that the liquid level detection value even though it has already been unloaded start does not rise) is not detected, it is normal liquid level gauge 28 ₁ It proceeds to S35. In S35, it is checked whether the unloading is completed. In S35, when unloading from the hatch is not completed,
Returning to S32, the processes of S32 to S35 are repeated.

However, when the measured value of the liquid level gauge 28 ₁ provided in the underground tank 11 ₁ reaches the upper limit alarm level in S 32, the process proceeds to S 36 because the underground tank 11 ₁ is full. Prohibit unloading. At the same time, the driver is notified by an alarm and a display on the liquid crystal display 35b. Accordingly, since the electromagnetic valve 45a is closed and the air supply is cut off by prohibiting unloading, the bottom opening / closing valve 23a is switched to the closed state.

In S33, the underground tank 1
When one measured value of the level gauge 28 ₁ provided ₁ has reached the overflow level exceeds the high alarm level, so there is a possibility that the hydraulic fluid overflows from the oil port 15 _1, the process proceeds to S36 unloading I forbid you. The above S
At 34, the liquid level meter 2 provided in the underground tank 11 ₁
When 8 ₁ measurement value is an abnormal value, it proceeds to S36 and determines that some failure in the level gauge 28 ₁ occurs prohibiting unloading. Thereafter, the process returns to S23, and S23
The subsequent processing is performed again.

[0058] In this manner described above S28, the check whether reaches an upper limit warning level in S32 even after the amount unloading from the hatch 22a is confirmed that less than the free space of the underground tank 11 _1, further S33 To check if the overflow level has been reached,
Overflow can be more reliably prevented. Accordingly, in the above S28, after the amount unloading from the hatch 22a is confirmed that less than the free space of the underground tank 11 _1, the liquid level of the underground tank 11 in wholesale chance load reaches the limit alarm level or overflow level also it is possible to prevent the hydraulic fluid by closing the bottom opening and closing valve 23a of the tank lorry vehicle 21 overflows from the oil port 15 _1, it is possible to perform the unloading operations of the tank lorry vehicle safely and accurately.

In the above embodiment, the data plug 19
₁ ~ 19 _n can be made to prevent only contamination attached to the oil port 15 ₁ to 15 _n (different oil type mixed accident), can reduce the economic burden of filling station side as compared with the conventional addition, existing There is no need to change the structure of the gas station. In the above embodiment, the case of unloading the oil liquid into the underground tank of the gas station is described as an example. However, the present invention is not limited to this.
It is needless to say that the present invention can be applied to unloading the oil liquid to an underground tank provided in another place.

It goes without saying that a data plug other than the configuration using the resistors 62a and 62b as in the above embodiment can be applied.

[0061]

As described above, according to the present invention, the load capacity of the hatch indicated by the hatch instruction means from the hatch capacity storage means and the free space of the tank identified by the identification means via the tank capacity reading means. When the hatch capacity is larger than the free capacity of the tank based on the result of comparing the empty capacity of the tank and the loading capacity of the hatch, the unloading prohibition means for prohibiting unloading from the hatch is provided. The overflow at the time of unloading can be prevented without changing the equipment at the gas station. Therefore, since overflow at the time of unloading can be prevented only by updating the equipment on the tank lorry vehicle side, it is possible to carry out without increasing the economic burden on the gas station.

[Brief description of the drawings]

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

FIG. 2 is a diagram schematically showing a data table 51 stored in a memory of an unloading computer 35.

FIG. 3 is a configuration diagram of a pneumatic system mounted on a tank truck.

FIG. 4 is a view showing a configuration of unloading hoses 17 and 18;

5 is a perspective view showing the configuration of a data plug 19 ₁ ~ 19 _n.

[6] Data plug 19 ₁ ~ 19 _n resistor 62a, 6
It is a figure which shows the specific example of the resistance value of 2b.

FIG. 7 shows that the unloading hose 17 is connected to the lubrication port 1 of the underground tank 11.
FIG. 5 is a diagram showing a state in which the vehicle is connected to a discharge port 5 of the tank truck 5 and a tank truck 21.

8 is a longitudinal sectional view showing the liquid level of the underground tank 11 ₁ to 11 _n.

FIG. 9: Level gauges 28 ₁ to 2 of underground tanks 11 _{1 to} 11 _n
It is a diagram illustrating an example of various signals output from the 8 _n.

FIG. 10 is a flowchart illustrating an unloading process performed by an unloading computer 35;

FIG. 11 is a flowchart for explaining an unloading process executed after the process of FIG. 10;

FIG. 12 is a diagram showing a list of information of each underground tank 11 _{1 to} 11 _n .

FIG. 13 is a diagram showing a hatch data list.

FIG. 14 is a conceptual diagram for explaining an allocation process for converting a tank number list of a liquid level gauge into a data plug list.

[Explanation of symbols]

11 _{1 to} 11 _n Underground tank 13 _{1 to} 13 _n Lubrication line 15 ₁ to 15 _n Lubrication port 17, 18 Unloading hose 19 _{1 to} 19 _n Data plug 21 Tank lorry 22a to 22g Hatch 23a to 23g Bottom opening / closing valve 24 Air pressure System 25 First discharge port 26 Second discharge port 28 _{1 to} 28 _n Liquid level gauge 30 Outdoor liquid level display 33 Liquid level gauge control panel 35 Unloading computer 35b Liquid crystal display 36 Communication cable 41 Compressor 42 Air tank 43 Air Pipes 44a to 44g Branch pipes 45a to 45g Solenoid valve 51 Hose 46, 47, 55, 58 Connector 60 Housing 61a to 61c Contact 62a First resistor 62b Second resistor

Claims (1)

[Claims] 1. A hatch loading amount storage means for storing an amount of liquid loaded on each hatch of a tank truck, and a hatch loading amount mounted on the tank truck and loaded on each hatch based on the hatch loading amount storage means. An on-board controller for managing unloading of the oil liquid, the unloading device for a tank truck having the on-board controller, wherein the on-board controller is connected to a data output unit of a liquid level gauge provided near a lubrication port of a gas station tank. Tank capacity reading means for collectively reading empty capacity that can be unloaded to each tank, identification means for identifying a tank connected to the tank lorry via an unloading hose, and of each hatch of the tank lorry. Hatch instructing means for instructing a hatch for unloading the oil liquid; a hatch loading amount designated by the hatch instructing means from the hatch capacity storage means; Comparing means for reading the empty capacity of the tank identified by the identifying means via the ink capacity reading means, and comparing the empty capacity of the tank with the hatch loading amount; based on the comparison result of the comparing means, An unloading prohibiting means for prohibiting unloading from the hatch when the loading amount is larger than the free capacity of the tank.