JPH0662159B2 - Oil mixture prevention device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil mixture prevention device for preventing oil of different oil types from being supplied from a tank truck to a storage tank of a gas station.

[Conventional technology]

Conventionally, in order to prevent the wrong oil type from being refueled from the tank truck to the storage tank of the gas station, a joint finger replacement call between the tank truck driver and the gas station manager is performed prior to refueling. . However, since it relies on the attention of humans, there is a risk of malfunction, and a mixed oil accident was likely to occur.

[Problems to be Solved by the Invention]

An object of the present invention is to provide an oil mixing prevention device capable of reliably preventing an oil mixing accident.

[Means for Solving the Problems]

According to the oil mixture prevention device of the present invention, the oil seed plugs are connected to the respective keys for opening and closing the locks for individually locking the oil fill openings for the respective oil seeds at the gas filling station, and these oil seed plugs are The tank truck has an annular groove formed at a predetermined position in the linear direction corresponding to the type of oil at the filler opening that opens and closes when the key is connected. Detecting means including first and second limit switches for detecting whether or not the annular groove is provided at a predetermined position in the linear direction of the oil type plug, and the oil type of the oil supplied from the tank truck is detected. And a determination means such as a comparator for determining whether or not the oil type is equal to the oil type detected by the means.

[Action]

When oil is supplied from a tank truck to a storage tank of a gas station, first, a gas supply port of the gas station is opened by a key.
For example, the gas tank has a storage tank for each type of oil such as gasoline, light oil, and kerosene, and each refueling port can be opened only by the corresponding key. There is a 1: 1 correspondence between the key and the oil type plug attached to the key.

Next, the key used to open the oil supply port and the oil seed plug connected to the key are carried to the tank truck, and the oil seed plug is checked by the detection means of the tank truck. Since the oil seed plug has a groove corresponding to the oil seed with which it is associated, the detection means detects the oil seed of the opened oil filler port from the annular groove of the oil seed plug using the key, and the determination means. Determines whether the type of oil detected by the detection unit matches the type of oil supplied from the tank truck.

〔Example〕

 The present invention will be described below with reference to the illustrated embodiments.

In FIG. 1, in the basement of the gas station 10, for example, storage tanks 12a,
12b, 12c are provided, and the fueling ports 14a, 14b, 14c are arranged above or near the ground, and the storage tanks 12a, 12b, 12 under the ground, respectively.
It leads to c. Each refueling port 14a, 14b, 14c is a tank truck
It is closed by the caps 18a, 18b, 18c except when the oil from 16 is being refilled, and each of the caps 18a, 18b, 18c has a lock 20a, 2c.
It is multiplied by 0b and 20c.

The key holders 22a, 22b, 22c are stored in the office 21 of the gas station 10, and each key holder 22a, 22b, 22c has a lock 20a, 20c.
An oil seed plug 26 is attached together with a key 24 corresponding to b and 20c.

The tank truck 16 is a tank that stores oil such as gasoline.
Along with 28, an oil type determination unit 30 is provided. The oil type determination unit 30 is provided with an insertion port 32 into which the oil type plug 26 is inserted, and an alarm device 34 including a red lamp or a buzzer, and further includes a bottom valve arranged at the bottom of the tank 28. An oil type detection unit 36 for the oil supplied from the tank truck 16 and a discharge valve 38 with a lock are provided in the lower portion.

2 (a) to (c) show the details of the oil seed plug 26. As shown in FIG. Each of the oil type plugs 26 has a hole 40 in the head portion 42 for passing the ring of the key holders 22a to 22c, and near the tip of the shaft portion 44, the depth of the insertion port 32 of the oil type determination unit 30 described above. An annular locking groove 46 is formed in which the elastic projections provided in are fitted. A flange 48 is formed between the head 42 and the shaft 44, and the oil seed plug 26
Until the flange 48 abuts the inlet of the inlet 32
Plugged into 32. Each oil seed plug 26 has a filler port 14a-14c which is opened by a key 24 with which it is attached.
An annular groove 50 is formed at a predetermined position in the axial direction corresponding to the oil type. The shaft portion 44 is divided into two parts, a tip side and a head side, with respect to the axial direction, and each oil type plug 26 is made to correspond to an oil type depending on whether or not there is an annular groove 50 in these two parts. For example, each oil type plug 2 in Fig. 2 (a), (b), (c)
6 corresponds to gasoline, light oil, kerosene,
In the oil seed plug 26 of FIG. 2 (a), the annular groove 50 is not formed, and in the oil seed plug 26 of FIG. 2 (b), the annular groove 50 is formed at the tip side portion of the shaft portion 44. In the oil seed plug 26 of FIG. 2 (c), the annular groove 50 is formed in the portion of the shaft portion 44 on the head 42 side. The annular grooves 46 and 50 have a gently curved cross section.

FIG. 3 is a vertical sectional view of the insertion port 32 of the oil type determination unit 30. An elastic protrusion 52 that protrudes radially inward is provided on the inner periphery at the back of the insertion port 32, and this protrusion 52 is provided when the oil seed plug 26 is completely inserted into the insertion port 32. It fits into the locking groove 46 of the oil seed plug 26. First and second limit switches 54,5
6 are disposed on the inlet side and the back side with respect to the axial direction of the insertion port 32, and their axial position at the insertion port 32 is such that the oil seed plug 26 is completely inserted into the insertion port 32. At times, it corresponds to the position of the annular groove 50 in the ring portion 44.

FIG. 4 is a chart showing the relationship between the ON and OFF states of the first and second limit switches 54 and 56 and the oil type. Outlet 32
When the oil type plug 26 of Fig. 2 (a) is inserted into the
Since the annular groove 46 does not exist in 4, the rods of the first and second limit switches 54 and 56 are both in the positions retracted into the case, and the first and second limit switches 54 and 56 are both turned on. Therefore, the oil type A is determined.
When the oil type plug 26 of FIG. 2 (b) is inserted into the insertion port 32, the shaft portion 44 has the annular groove 50 on the tip side, so
Only the rod of the limit switch 54 of the above is in the position retracted into the case, and the first and second limit switches
54 and 56 are turned on and off, respectively, and are determined as oil type B. When the oil type plug 26 of FIG. 2 (c) is inserted into the insertion port 32, since the annular groove 50 exists on the shaft portion 42 side of the shaft portion 44, only the rod of the second limit switch 56 is The position where the first limit switch 54 and the second limit switch 56 are retracted to the case are turned off and on, respectively, and the oil type C is determined. When the oil type plug 26 is not inserted into the insertion port 32 and both the first and second limit switches 54 and 56 are off, the power of the oil type determination unit 30 is turned off.

In the oil type detection mechanism shown in FIG. 3, before the oil type plug 26 is completely inserted into the insertion port 32, the first limit switch 54 is provided due to the absence of the annular groove in the tip side portion of the shaft portion 44.
Since the wrong oil type may be determined when is turned on, a third limit switch 58 may be provided at the back of the insertion port 32 as shown in FIG. In this case, when the oil type plug 26 is completely inserted into the insertion port 32, the rod of the third limit switch 58 is pushed into the case and the third limit switch 58 is turned on. Thus the third
After the limit switch 58 is turned on, the oil type is determined by the first and second limit switches 54 and 56.

FIG. 6 shows the discharge valve with lock 38 and its control mechanism. The lock-equipped discharge valve 38 is opened and closed by rotating the lever 60, and the rotary shaft 62 of the lever 60 has a triangular groove 64 formed therein. The lock piece 66 is disposed so as to be movable in the radial direction of the rotary shaft 62 in the cylindrical space 68, has a triangular tip end that can be fitted into the triangular groove 64, and is rotated by the spring 70.
It is biased towards the center of 62. Wire 72 is cable 74
And is coupled together to the actuator 76 of the oil type determination unit 30 and the lock piece 66 at the other end. When the lock piece 66 is fitted in the triangular groove 64, the rotation operation of the lever 60 is blocked, and the discharge valve with lock is
38 is closed. Actuator 76, wire 72
When the actuator is pulled toward the actuator 76, the lock piece 66 comes out of the triangular groove 64, and the lever 60 can be rotated.
It is possible to switch the discharge valve with lock 38 from the closed state to the open state.

Returning to FIG. 1, the operation of the embodiment will be described. When the tank truck 16 arrives for refueling the storage tanks 12a, 12b and 12c, a key holder having keys 24 corresponding to the refueling ports 14a, 14b and 14c from which refueling is to be performed.
22a, 22b and 22c are selected by the staff of the gas station 10 from the storage place in the office, and the locks 20a, 20b and 20c are opened using the key 24 of the key holders 22a, 22b and 22c, and the caps are opened.
18a, 18b and 18c are removed from the fuel filler ports 14a, 14b and 14c.

Next, attach the key chains 22a, 22b and 22c to the tank truck.
Take it to the oil type determination unit 30 of 16 and its key holder 22a,
The oil type plugs 26 attached to 22b and 22c are inserted into the insertion ports 32. As a result, as described with reference to the chart of FIG. 4, in relation to the ON / OFF of the first and second limit switches 54, 56 as the detection means for detecting the oil type of the oil supply ports 12a, 12b and 12c, Refueling opening 14 now opened by staff
Oil types a, 14b and 14c are detected. On the other hand, the data representing the oil type of the oil supplied from the tank truck 16 is set in advance in advance, and thus the oil type set in advance in advance or the oil type detected in the oil type detection unit 36 is Whether or not the oil type detected by the first and second limit switches 54 and 56 coincides with the insertion of the oil type plug 26 is judged by the judging means such as a comparator.

If they do not match, an alarm is generated by the alarm device 34 and the actuator 76 of FIG.
Return the wire 72 to the discharge valve 38 with lock, insert the lock piece 66 into the triangular groove 64 of the rotary shaft 62 by the spring 70, and
Is fixed, that is, the discharge valve with lock 38 is fixed in the closed position. In this way, the oil is not discharged from the tank 28 of the tank truck 16 and the oil mixture is prevented.

If they match, the alarm 34 does not generate an alarm, and the actuator 76 of FIG.
Is pulled toward the actuator 76, the lock piece 66 is pulled out from the triangular groove 64, and the lever 60 can be rotated.
As a result, by rotating the lever 60, the discharge valve with lock
When 38 is opened, the oil in tank 28
Is introduced into the fuel filler port 14a, 14b, or 14c via a hose.

〔The invention's effect〕

In this way, since it is automatically determined by the media of the oil type plug, whether or not the type of oil at the filler port to be refueled and the type of oil to be refueled from the tank truck are matched is automatically determined. The risk of erroneous operation due to human carelessness can be eliminated, and the occurrence of a mixed oil accident can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an oil mixing prevention device to which the present invention is applied, FIG. 2 is a detailed view of an oil seed plug of FIG. 1, and FIG. 3 is a vertical sectional view of an insertion port of FIG. Fig. 4 is a chart showing the relationship between ON / OFF of the limit switch of Fig. 3 and the oil type, Fig. 5 is a vertical sectional view of the insertion port to which the third limit switch is added, and Fig. 6 is a discharge with lock. It is a block diagram of a valve and its control mechanism. In the figure, 10 ... filling station 14a, 14b, 14c ... filling port 16 ... tank truck 20a, 20b, 20c ... lock 24 ... key 26 ... oil type plug 30 ... oil type determination unit 36 ... ... Oil type detector 50 ... annular groove 54 ... first limit switch 56 ... second limit switch.

Claims (3)

[Claims] 1. An oil seed plug is connected to each key that opens and closes a lock that individually locks a filler opening for each oil seed at a gas station, and these oil seed plugs are connected to each other. The tank truck has an annular groove formed at a predetermined position in the axial direction corresponding to the oil type of the oil supply port where the key is opened and closed, and the tank truck has an insertion port into which the oil type plug is inserted and an inserted oil type plug. Detecting means including first and second limit switches for detecting whether or not the annular groove is provided at a predetermined position in the axial direction, and the oil type supplied from the tank truck is the oil type detected by the detecting means. And a determining means such as a comparator for determining whether or not 2. The oil blending prevention apparatus according to claim 1, wherein the tank truck is equipped with an alarm device for issuing an alarm in relation to the output of the determination means. 3. The tank lorry vehicle is provided with a locking mechanism for fixing an on-off valve at an oil discharge port of the tank lorry vehicle in a closed state in relation to an output of the judging means. 5. The oil mixture prevention device according to claim 1 or 2.