JPS587559B2 - Fixed amount liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metering liquid supply device, and an object of the present invention is to provide a metering liquid supply device that can automatically perform accurate metered liquid supply.

Conventionally, in liquid supply and shipping devices for tank lorry vehicles that dispense a fixed amount of petroleum, etc. into the hatch of a tank lorry vehicle, computers have been introduced as part of streamlining the flow mechanism to streamline the shipping process. Shipping work is left to the tank truck driver.

The tasks performed by the tanker truck driver include: - Selecting the type of liquid to be loaded according to the shipping instructions; - Opening the hatch lid; - Inserting the loading arm into the hatch that corresponds to the liquid type specified by the computer; Setting the hatch capacity, closing the hatch lid, etc. These operations are not mechanized because they must be confirmed with the human eye.

Especially due to current Japanese business practices and fire service laws, etc.
Tank lorries have tanks divided into units of 1 to 4 kl, and the capacity is simply written on the entrance of the hatch and can be determined mechanically.Therefore, mechanization of the hatch capacity setting described in ① above is required. The current situation is that this work is considered difficult and is left to the driver.

However, if the hatch capacity is incorrectly set and the amount exceeds the capacity of the hatch to be filled, there is a risk of overflow and an accident such as the spillage of dangerous substances.

If this hatch capacity detection were mechanized, humans would become an auxiliary role, and the safety of shipping operations would be dramatically improved. However, the shape of the hatch varies depending on the type of tanker truck, and even if the hatch is of the same model. Hatch capacity is 2kg or 4kl
Due to various differences, it has been difficult to mechanize the detection of the hatch capacity, and there have been drawbacks such as the inability to automatically perform accurate metered liquid supply.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration diagram of an embodiment of a metering liquid supply device according to the present invention.

In the figure, 1 is a storage tank mounted on a truck frame (not shown), 2 is a liquid supply pump, and its suction port is connected to the outlet of the tank 1.

3 is a flow meter which can sequentially measure the amount of liquid supplied into the hatch, and when the measured value reaches a predetermined amount before the reference unit of the hatch capacity, for example, every 1 kl, it outputs a pre-metering signal and When the reference unit is reached, a quantification signal can be transmitted, and the pre-quantification signal and quantification signal are input to a control circuit 12, which will be described later.

The inlet of the flow meter 3 is connected to the discharge port of the pump 2, and the outlet thereof is connected to the inlet of the metering valve 4, respectively.

This metering valve 4 is half-opened by the liquid supply start signal, and is fully opened after filling a predetermined amount, and when a pre-metering signal from the front distribution flowmeter 3 and a detection signal from the liquid level detection nozzle, which will be described later, are respectively transmitted. It is semi-closed in response to a signal, and is fully closed in response to both the quantitative signal from the flowmeter 3 and the detection signal from the liquid level detection nozzle.

The metering valve 4 outlet is connected to the loading arm 5.

A drop pipe 6 portion at the tip of the loading arm 5 is inserted into and removed from the hatch 7 through the entrance 8 thereof.

The liquid in the storage tank 1 flows into the hatch 7 from the tip of the drop pipe 6 of the loading arm 5 through the pump 2, flow meter 3, and metering valve 4 in sequence.

A liquid level detection nozzle 9 is attached to a predetermined position on the outer surface of the peripheral wall of the drop pipe 6.

This liquid level detection nozzle 9 detects the liquid level when the amount of liquid supplied in the hatch 7 reaches a predetermined amount range before a predetermined set amount.

This detection nozzle 9 is connected to a control circuit 12 via a pneumatic amplifier 10 and a pressure switch 11.

Then, the pneumatic amplifier 10 is activated by the detection signal from the detection nozzle 9, and the air pressure supplied to the pneumatic amplifier 10 via the piping 13 is amplified by the amplifier 10, and then sent to the pressure switch 11. The switch 11 is activated, and the detection signal from the liquid level detection nozzle 9 is input to the control circuit 12 as an electrical signal.

Reference numeral 14 denotes an insertion depth detector attached to a predetermined position on the outer surface of the peripheral wall of the drop pipe 6, which detects when the drop pipe 6 is inserted into the hatch 7 to a predetermined depth.

As shown in FIG. 2, the insertion depth detector 14 includes a slide body 16 with a guide surface biased in one direction by a spring 15, and a slide body 16 with a guide surface 16 biased in one direction by a spring 15. It has a switch 18 which is opened and closed by the operation.

As the drop pipe 6 is inserted into the hatch 7 to a predetermined depth, the sliding body 16 slides a predetermined distance in the other direction against the biasing force of the spring 15, so that the guide surface 1
7 closes the switch 18, the detection is performed, and the detection signal is input to the control circuit 12.

At other times, switch 18 is in the open state.

The detection signal from this insertion depth detector 14 is transmitted to the control circuit 12.
Unless it is input, the fluid supply pump 2 will not operate even if the start switch 19 is closed, and therefore, refueling cannot be performed.

Start switch 19 is electrically connected to control circuit 12 .

The pump 2, flow meter 3 and metering valve 4 are connected to the control circuit 1.
2, respectively.

FIG. 3 is a schematic diagram of the tank truck 20. The inside of the tank 21 is partitioned into a plurality of hatches 7 of 1 to 4 kl each, and each hatch 7 has a population 8 at the top. The structure is such that it is filled with

The shape and capacity of this hatch 7 are similar to that of tank truck 2.
The size of the hatch varies depending on the manufacturer, etc., and is not standardized, and the hatch capacity may differ even in the same vehicle model.

This hatch capacity must be determined so that the distance from the inlet 8 of the hatch 7 to the liquid level when full is not extremely different from the viewpoint of safety during transportation.

Next, the operation of the quantitative liquid supply device having the above configuration will be explained.

First, when the drop pipe 6 of the loading arm 5 is inserted into the hatch T to a predetermined depth, a detection signal from the insertion depth detector 14 is input to the control circuit 12.

Thereafter, by closing the start switch 19, a start signal is input to the control circuit 12, and as a result, the control circuit 12 outputs a pump operation start signal and a metering valve half-open signal, respectively, and the pump 2 is operated, and the metering valve is 4 is half-open (No. 1 and 2 petroleum tanks have initial speed restrictions, so they are opened half-open at the start of refueling.

) The liquid in the storage tank 1 flows into the hatch 7 from the tip of the drop pipe 6 of the loading arm 5 via the pump 2, the flow meter 3, and the metering valve 4 in order, and liquid supply is started.

When a predetermined amount of liquid is supplied from the start of this liquid supply, a metering valve fully open signal is output from the control circuit 12, the metering valve 4 is fully opened, and after the metering valve 4 is fully opened, liquid is supplied into the hatch γ at a predetermined flow rate. It will be done.

The amount of liquid supplied is successively measured by the flow meter 3, and the measured value of the flow meter 3 is 100
A pre-quantification signal is sent each time the signal reaches the front of l.
Each time kl is reached, a quantitative signal is transmitted and both signals are input to the control circuit 12.

Here, if the capacity of the hatch 7 is 1 kl, as shown in FIGS. 4A and 5A, any liquid level L1 before the pre-quantification signal is sent from the flowmeter 3 is detected by the detection nozzle 8. If the capacity of the hatch 7 is 2kl, the second pre-quantification signal is transmitted after the first pre-quantification signal is transmitted from the flowmeter 3, as shown in Figures 4B and 5B. If the previous arbitrary liquid level L2 is detected by the detection nozzle 8 and the capacity of the hatch 7 is 4kl, the fourth pre-quantification signal is sent after the third pre-quantification signal is sent, as shown in Fig. 4C and Fig. 5C. An arbitrary liquid level L3 before the pre-quantification signal is transmitted is detected by the detection nozzle 8.

When the detection signal from the detection nozzle 8 and the final pre-quantification signal from the flowmeter 3 are input to the control circuit 12,
When the metering valve half-close signal is output from the control circuit 12 and the metering valve 4 is half-closed, and the measured value of the flow meter 3 reaches a predetermined set amount, the metering signal from the flow meter 3 is output to the control circuit 1.
2, a metering valve fully closed signal is output from the control circuit 12, the metering valve 4 is fully closed, and the liquid supply is stopped and the operation of the pump 3 is also stopped.

In the above embodiment, the hatch 7 of the tank truck 20 is used as a specific example of the container for supplying liquid, but the container is not limited to this.

As described above, according to the metering liquid supply device of the present invention, the pre-quantification signal of the flow rate measuring means and the amount of liquid in the container when the remaining amount of liquid to be supplied into the container is less than the reference unit. Since the valve means is half-closed by the detection signal from the surface detection means for detecting the liquid level, and then fully closed by the quantitative signal from the flow rate measuring means, hammering is simply achieved by two-stage valve closing. Not only does it have the effect of preventing problems, but it also makes it possible to automatically stop the liquid supply when the above amount of liquid has been supplied, without having to know the capacity of the hatch before starting liquid supply. There is no need to set the scheduled amount of liquid to be supplied using a brisset counter, and overflow accidents can be reliably prevented, so liquid can be supplied extremely safely.

Especially when applied to shipping oil etc. to tanker trucks,
It improves the safety of the shipping process, and only the liquid supply equipment needs to be modified without making any modifications to the tank truck.Furthermore, the liquid level detection range can be widened, so it can be used for hatches, etc. of various tank trucks. It has features such as being widely applicable to containers.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an embodiment of the quantitative liquid supply device according to the present invention, Fig. 2 is an enlarged sectional view of a drop pipe portion, Fig. 3 is a schematic diagram of a tank truck, and Fig. 4A ,B,
C is a diagram showing the opening/closing operation timing of the metering valve, respectively, and FIGS. 5A, B, and C are diagrams showing the liquid level of the hatch, respectively. 3... Flowmeter, 4... Metering valve, 7... Hatch (container),
9...Liquid level detection nozzle, 12...Control circuit, 14...Insertion depth detector, 15...Spring, 16...Sliding body, 17...
...Guide surface, 18...Switch.

Claims (1)

[Scope of Claims] 1. Sequentially measuring the amount of liquid supplied into the container, and transmitting a pre-quantification signal when the measured value reaches a predetermined amount before the reference unit for each reference unit of capacity of the container, and A flow rate measuring means for transmitting a quantitative signal when the reference unit is reached; and a liquid level for detecting the liquid level in the container when the remaining amount of liquid to be supplied into the container becomes less than the reference unit. a detection means, a valve controlled to be in a half-closed state by a pre-quantification signal from the flow rate measuring means and a detection signal from the liquid level detecting means, and to be in a fully closed state by a subsequent quantitative signal from the flow rate measuring means; 1. A quantitative liquid supply device comprising: means. 2. It is further provided with a means for detecting when the liquid supply nozzle is inserted into the container to a predetermined depth, and configured so that the liquid can be supplied into the container based on the detection signal from the detection means. A quantitative liquid supply device according to claim 1, characterized in that: