JPS6235042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metering liquid supply device that is capable of detecting an abnormality in a flow rate transmitter when a start switch is operated before the start of metering.

Generally, a metering liquid supply device for supplying liquid to a tank truck is equipped with a two-stage on-off valve as a metering valve, such as a main valve and a sub-valve installed in parallel, and a flow meter in the pipe for supplying liquid. When the start switch is pressed, a first-stage valve opening signal is output from the quantitative control section, and the sub-valve of the two-stage on-off valve is first opened to start liquid supply, and at the same time A flow rate signal is outputted from the flow transmitter for each unit flow rate and sent to the quantitative control section. Then, when a predetermined amount of liquid is supplied, a two-stage valve opening signal is output from the quantitative control section to open the main valve. By the way, the amount of liquid to be supplied is measured by pulsing the rising or falling part of the flow rate signal and counting it to integrate the amount of liquid to be supplied, and when it reaches a predetermined amount before the set amount of liquid to be supplied, the quantitative control section A first stage valve opening signal is output, first the main valve is closed, and then when the set amount is reached, the auxiliary valve is closed.

Therefore, in conventional metering liquid supply devices, the metering control unit is built to measure the flow rate based on the mode of the flow rate signal output from the flow rate transmitter, as described above, so that the liquid supply is not started. If there is an abnormality in the flow rate transmitter due to a contact failure, etc., and the flow rate signal continues to be output, this abnormality cannot be detected in advance, and the start switch will not be activated. When pressed, the liquid supply operation is performed without the quantitative control section being able to count the flow rate signal, which is dangerous because an overflow occurs due to a miscount in the quantitative control section.

This invention was made in view of the above circumstances,
When the start signal is sent, if a flow rate signal is apparently already being sent from the flow rate transmitter due to a contact failure of the flow rate transmitter, etc., the start signal is inhibited to prevent the start of liquid supply. It is an object of the present invention to provide a metering liquid supply device which is capable of detecting the initial mode of a flow rate transmitter and performing a start interlock of a start signal by providing a gate circuit.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. Reference numeral 1 in FIG. 1 is a shipping device for supplying liquid to a tank truck 2, and this shipping device 1 includes a stage 3 and a ceiling 4. In the figure, reference numeral 5 denotes a liquid supply pipe whose one end is connected to a storage tank (not shown) and which is provided for each liquid supply system.
A two-stage on-off valve 8 as a metering valve consisting of a flow meter 7 and a main valve 8a and a sub-valve 8b is interposed,
A loading arm 9 is provided at the tip, and the tip of the loading arm 9 is connected to the tank truck 2.
It is inserted into the loading port of the container and the liquid is supplied. In FIG. 1, 10 is a grounding device, which removes static electricity charged on the tank truck 2, and 11 is an operation panel suspended from the ceiling 4. Quantity setter 1
2. A liquid supply permission lamp 13 and a start switch 14 are attached.

As shown in FIG. 2, the flow rate transmitter 6 is provided with a first-stage cam 6a ₁ and a second-stage cam 6a ₂ , and the first-stage cam 6a ₁ is further provided with a micro switch 6b _{1 .}
A micro switch 6b ₂ is provided on the two-stage cam 6a ₂ . The first-stage cam 6a ₁ and the second-stage cam 6a ₂ rotate in accordance with the flow rate flowing through the flowmeter 7, thereby causing the micro switch 6
When b ₁ and 6b ₂ are opened and closed and are functioning normally, the 1st cam signal A shown in Fig. 3 is transmitted, then the 2nd cam signal B is transmitted, and the 2nd cam signal B
After the cam signal A disappears, the first-stage cam signal A disappears, and this state is repeated and transmitted at a predetermined period, that is, every unit flow rate.

The first-stage cam signal A and the second-stage cam signal B are each sent to the quantitative control section 15, and simultaneously sent to the gate circuit 16. Then, the first-stage cam signal A is counted as a flow rate signal in the quantitative control section 15. Further, by pressing a start switch 14 attached to the liquid supply device 1, a start signal is generated and sent to the gate circuit 16.

In the gate circuit 16, when the start signal is transmitted, either one of the first-stage cam signal A or the second-stage cam signal B sent from the flow rate transmitter 6, or both cam signals are already present. If the start signal is being transmitted, the start signal is prohibited to prevent the start of liquid supply, and the above 1.
When both the stage and second stage cam signals A and B are not output, the start signal is passed through and the signal is self-held and sent to the gate circuit 17, that is, the first stage and second stage cam signals are output. An initial mode of the cam signal is detected.

In the gate circuit 17, the gate circuit 16
The grounding device 1 attached to the shipping device 1 receives the start signal sent through the
0, quantity setter 12, and liquid supply permission lamp 13, which are sent from the field ceramics 18, receive the earth confirmation signal, quantity setting signal, and liquid supply permission signal, and if these signals are output, the above-mentioned start starts. Send the signal to the quantitative control unit 15 and check whether it is being output or not.
When the output disappears during liquid supply, an abnormality detection signal is sent to the quantitative control section 15 to stop the liquid supply, and at the same time an alarm is issued.

Next, the operation of the above-mentioned metered liquid supply device will be explained. Now, when the loading arm 9 is inserted into the tank truck 2 and preparations for liquid supply are completed, and the start switch 14 is pressed, a start signal is transmitted and sent to the gate circuit 16. In the gate circuit 16, if one or both of the first-stage and second-stage cam signals A and B have already been received through the flow rate transmitter 6, the start signal is prohibited. The start signal cannot pass through the gate circuit 16, so the liquid supply start operation is not performed. When the start signal is received, the gate circuit 16
If neither the stage/two-stage cam signals A and B are received, the start signal is sent to the gate circuit 1.
6 and is sent to the gate circuit 17. The gate circuit 17 has already received the earth confirmation signal and quantity setting signal sent from the field equipment 18, and if there is an abnormality in at least one of these signals, the start signal cannot pass. The abnormality detection signal is sent to the quantitative control section 15, and a liquid supply stop signal and an alarm signal are outputted through the quantitative control section 15. If there is no abnormality in each signal sent from the field porcelain 18, the start signal is passed through the gate circuit 17 to the quantitative control section 15.
The quantitative control unit 15 receives the start signal and outputs a valve opening signal, and the sub valve 8b of the two-stage on-off valve 8 opens to start liquid supply.

After the liquid supply starts, the main valve 8a opens when the first two-stage cam signal B is output, and the liquid supply continues.
As the liquid supply progresses, the quantitative control unit 15 captures the rising or falling portion of the first-stage cam signal A output for each unit flow rate, uses it as a flow rate signal, and counts the flow rate.

A normal fixed amount liquid supply stop operation occurs when the liquid supply progresses and reaches the set liquid supply amount at the falling edge of the next 1st stage cam signal A. ), the quantitative control unit 15 outputs a first-stage valve closing signal at the next falling edge of the two-stage cam signal B, and the main valve 8a closes. When the step cam signal A falls, the second step valve closing signal is output from the quantitative control section 15, the sub valve 8b is closed, and one fixed amount liquid supply operation is completed.

If the ground confirmation signal or the quantity setting signal disappears while the quantitative liquid supply operation is in progress, the self-held start signal from the gate circuit 17 will no longer be supplied to the quantitative control section 15. 15 outputs an abnormality detection signal, and the main valve 8
A and the sub-valve 8b are closed to stop the liquid supply and an alarm is issued to notify the operator of the abnormality.

In addition, in the above embodiment, 2 is used as a metering valve.
Although the stage on-off valve 8 has been described as being composed of a main valve 8a and a sub-valve 8b, it may be configured so that one on-off valve is driven by a positioner or a multi-stage syringe to open and close in two stages. .

The metered liquid supply device of the present invention is as described in detail above, and includes a rotating body that rotates in conjunction with a flow meter and raises a flow rate signal of a switch during a part of the rotation period, and Since the refueling start signal is input to the quantitative control unit on the condition that the flow rate signal of Since it is possible to prohibit the
It was discovered before the start of liquid supply that the flow rate signal was still being output from the flow rate transmitter, and therefore,
It has many advantages and features, such as being able to prevent overflows due to measurement miscounts, which not only improves the reliability of the device, but also prevents environmental pollution, explosions, fire accidents, etc. due to overflows. It is something.

In addition, two sets of a rotary body that rotates in conjunction with the flow meter and a switch operated by the rotary body are provided, and the flow rate signals transmitted from these switches are controlled at different timings by the rotary body. Since I started it up or down it with
Suitable for use with on-off valves that have a stepwise flow rate switching function applied to general refueling equipment, the on-off valve can be switched at the required timing to maintain the required flow rate from the start to the end of refueling. The effect is that it can be controlled to increase or decrease in a pattern.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a tank truck shipping device, Fig. 2 is a schematic configuration diagram showing an embodiment of the quantitative liquid supply device of the present invention, and Fig. 3 is a time chart of the 1st and 2nd stage quantitative signals. . 6...Flow rate transmitter, 7...Flow meter, 8...2-stage on-off valve, 14...Start switch, 15...Quantitative control unit, 16...Gate circuit, 17...Gate circuit, 18...Site Equipment, A...1st cam signal,
B...Two-stage cam signal.

Claims (1)

[Claims] 1 A stage on which a tanker truck stops, a loading arm for supplying liquid provided on this stage, a pipe whose one end is connected to the loading arm and the other end is connected to a storage tank, and a pipe provided in the middle of this pipe. a flow meter, two rotating bodies that rotate in conjunction with the flow meter, and two rotating bodies that are each operated by the rotating bodies to raise and then lower a flow rate signal over a part of the rotation period. switch, the start switch that is operated to send a start signal when starting liquid supply, and the start switch that allows the start signal from the start switch to pass on the condition that the flow rate signals from the two switches above are not rising. Consisting of a gate circuit and a metering control section connected to the output side of the gate circuit and opening a metering valve on condition that the start signal is input,
A fixed amount liquid supply device, characterized in that timings at which the two rotating bodies operate the two switches to raise or lower the respective flow rate signals are set so as to have a time difference from each other.