JPH0989639A - Metering apparatus for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a metering apparatus, for a liquid, by which an error is not generated in a metering operation and by which the liquid having a viscosity in a wide range can be used as an object. SOLUTION: A prescription set value I is decided by a prescription control means 21. Then, a viscosity correction value and a metering correction value are computed by a correction computing means 24. When the prescription set value I and a corrected target value X are decided, a liquid flows into a metering tank 5 via respective metering valves 4A, 4B from a stock tank 3 by using a production control means 25. When the measured value of a metering sensor 6 is increased and a metered value reaches a preset value, the large-sized metering valve 4 is closed by the production control means 25. Even when the valve 4A is closed, the small-sized metering valve 4B is opened. As a result, a transient overshoot portion contributes to as to increase the metered value. When the metered value reaches the corrected target value X, the valve 4B is closed by the production control means 25, and a substantial metered value becomes the set value I.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid measuring device,
In particular, it relates to a metering device for a photographic coating solution having a wide range of viscosity.

[0002]

2. Description of the Related Art Conventionally, in the production of a photosensitive material such as a photographic film, there has been a step of measuring and supplying various chemicals from a stock tank when adjusting a coating solution. A liquid measuring device is used (for example, Japanese Patent Publication No. 6-12493).

[0003]

However, such a conventional liquid metering device has a problem that a metering error occurs due to the piping configuration and the viscosity of the liquid to be measured. That is, the liquid attached to the pipe portion specific to the metering system, for example, the pipe wall of the free fall type discharge pipe connected to the outlet of the on-off valve is not naturally dropped after the valve is shut down, and the pipe of the discharge pipe is By staying on the wall, inconvenience may occur such that an error occurs in the actual amount of supply to the downstream side. Moreover, there is a problem that this error has a particularly remarkable value in a high-viscosity liquid which is frequently used in the photographic film production process. For this reason, it has been awaited to realize an apparatus capable of preventing the above-described measurement error from occurring.

The present invention has been made in order to solve the problems of the prior art, and its purpose is to measure a liquid capable of targeting a liquid having a wide range of viscosity without causing an error during the measurement. To provide a device.

[0005]

In order to achieve the above object, a liquid metering device according to the present invention is a metering valve for supplying and shutting off a liquid for metering, and a liquid supply from the metering valve. It consists of a measuring tank, a liquid amount sensor for detecting the amount of liquid in the measuring tank, and a control computer, and the control computer has a process control means for executing the overall control and a prescription control means for outputting a set value of the measurement. And viscosity / flow rate correction data stored in advance
Flow rate correction data storage means, measurement system correction data storage means that stores measurement system correction data in advance, and corrected target value based on the set value I of the measurement and the viscosity / flow rate correction data or the measurement system correction data. Correction calculation means for imparting to the process control means, and signal exchange with the process control means to receive a detection value output from the liquid amount sensor,
It is characterized by comprising a metering control interface for sending a driving signal to the metering valve to drive the metering valve.

According to the liquid measuring apparatus of the present invention, when the type of liquid is designated, the control computer refers to the liquid viscosity correction data and the measuring system correction data stored in advance to refer to the liquid viscosity and the measuring system. Automatically make corrections based on the system. By this correction, the inflow amount of the residual amount in the measuring system, which occurs after the measuring, which depends on the liquid viscosity and the unique characteristics of the measuring system, is corrected, and the factor of error occurrence is eliminated to improve the measuring accuracy.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram for explaining the configuration of an embodiment of a liquid measuring apparatus according to the present invention. As shown in FIG. 1, a liquid measuring device 1 according to the present invention is connected to a stock tank 3 by piping, receives a liquid for measurement from the stock tank 3, and supplies the liquid to the downstream side as well as the liquid. Two large and small measuring valves 4A and 4B connected in parallel to cut off the supply, a measuring tank 5 which receives the liquid supply from the measuring valves 4A and 4B, and a liquid amount sensor 6 which detects the amount of liquid in the measuring tank 5. , Drive the metering valves 4A, 4B,
In addition, the control computer 2 is provided with the process control means 25 that receives the detection value from the liquid amount sensor 6.

The control computer 2 further includes a prescription management means 21 for outputting a set value I for measurement, a viscosity / flow rate correction data storage means 22 in which the viscosity / flow rate correction data 21a is stored in advance, and a measurement system correction data 23a in advance. The correction target value X is calculated based on the measurement system correction data storage means 23 in which is stored, the measurement setting value I and the viscosity / flow rate correction data 22a or the measurement system data 23a, and is given to the process control means 25. The metering control interface 26 that sends and receives the signal 25a to and from the correction calculation means 24 and the process control means 25, receives the liquid volume signal 6a from the liquid volume sensor 6, and sends the drive signals 2a and 2b to the metering valves 4A and 4B. Equipped with.

Further, the prescription management means 21 includes a viscosity / flow rate correction data storage means 22 and a measurement system correction data storage means 23.
By sending update signals 21a and 21b to
The flow rate correction data 22a and the metering system correction data 23a may be configured to be updatable.

The control computer 2 is a stored program type microcomputer, and is composed of a CPU stored in a chip, ROM and RAM (both not shown) inside or outside the chip. Also, an external storage device or the like can be connected outside the chip. The prescription management means 21, the correction calculation means 24, and the process management means 25 are described in a binary format, stored in the ROM or the RAM, and executed by the CPU. On the other hand, the viscosity / flow rate correction data 22 and the measurement system correction data 23 are stored in the RAM as well as in an external storage device such as an HDD in advance.

The viscosity / flow rate correction data 22 is stored in advance in the memory according to the procedure shown in FIG. First, the measurement system is set (step S21), and the stock solution is measured and measured for a predetermined time (step S22). If this measurement is performed for all viscosities (step S2
3 to S22), a series of viscosity / flow rate correction coefficients n1, n2, ..., Nj are identified based on the measured values (step S2).
4) Store these series of coefficients in the memory (step S
25).

Further, the measurement system correction data 23 is stored in the memory in advance according to the procedure shown in FIG. First,
Water is passed through the target measuring system and weighed (step S3
1) The fixed overshoot value unique to this plant is identified (step S32). If this measurement is performed for all measurement systems (steps S33 to S3)
1), correction coefficients k1, k2 of the measurement system based on the measured values
..., kh are identified, and a series of these coefficients are stored in the memory (step S34).

Next, the operation of the weighing device 1 will be described with reference to the flow chart shown in FIG. 4 and the explanatory view of the operation shown in FIG. 5 and FIG. First, the prescription setting means I is determined by the prescription management means 21 (step S41). Then, the correction calculation means 24 calculates the viscosity / flow rate correction coefficients n1, n2, which are stored in the memory in advance, from the viscosity of the liquid used.
The viscosity correction value is calculated with reference to nj (step S42). Similarly, based on the system used, the correction values k1, k2, ..., kh for the measurement system, which are stored in advance in the memory, are referenced to calculate the measurement system correction value (step S4).
3). Based on the viscosity correction value and the measurement system correction value, the correction calculation means 24 calculates the corrected target value X (step S44).

When the prescription set value I and the corrected target value X are determined as described above, both the large and small metering valves 4A and 4B are opened by the process control means 25, and the liquid is metered from the stock tank 3 to the metering valve 4A. It flows into the measuring tank 5 via 4B. The measured value of the liquid volume sensor 6 starts increasing as shown in FIG. When the measured value reaches X-β with a predetermined value β (step S46), the process control means 25 closes the large measuring valve 4A (step S47). The small metering valve 4B is now open.

Even if the large metering valve 4A is closed, the transient overshoot amount γ contributes and the measured value is X-β + γ.
The measured value continues to increase sharply until. After that, the liquid is supplied substantially only by the small measuring valve 4B, the increase of the measured value becomes gentle (see FIG. 5), and the gradual increase is continued.
When the measured value eventually reaches the corrected target value X (step S4
8), the process control means 25 closes the small metering valve 4B (step S49). As a result, the liquid flow from the stock tank 3 through the valve disappears, but the overshoot amount α after the small metering valve 4B is closed contributes and the actual measured value becomes the set value I. in this way,
Since the corrected target value X is calculated in consideration of the correction of the overshoot, the final measured value is equal to or extremely close to the set value I, and the error can be minimized.

FIG. 6 is a block diagram of a completed emulsion preparation system incorporating the liquid measuring device according to the present invention.
In the figure, the finished emulsion preparation system 10 comprises a stock tank 3, metering valves 4A and 4B, and a plurality of metering units 5 each comprising a metering tank 5 with a liquid quantity sensor 6, and supplies the solution to the completed emulsion preparation tank 8. Has become. If the control computer 2 has a processing capacity, the control computer 2 can be configured to execute the measurement control of the plurality of sets of measurement units in a time-sharing manner.

[0017]

As described above, in the liquid measuring apparatus according to the present invention, the correction based on the liquid viscosity and the correction based on the measuring system are performed on the basis of previously stored measuring system data and wide range liquid viscosity data. Since it is a configuration that is automatically performed by reference, it is possible to correct the inflow amount of the residual component generated after the measurement, which depends on the unique characteristics of the liquid viscosity and the measurement system.
This has the effect of suppressing the occurrence of errors and enabling reliable weighing.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of a liquid measuring apparatus according to the present invention.

FIG. 2 is a flow chart for creating viscosity / flow rate correction data shown in FIG.

FIG. 3 is a flow chart of creating the measurement system correction data shown in FIG.

FIG. 4 is an operation flow chart of the liquid measuring apparatus according to the present invention.

FIG. 5 is an explanatory view of the operation of the liquid measuring apparatus according to the present invention.

FIG. 6 is a block configuration diagram of an emulsion liquid preparation system incorporating a liquid measuring device according to the present invention.

[Explanation of symbols]

 1 Liquid Measuring Device 2 Control Computer 2a, 2b Driving Signal 3 Stock Tank 4A, 4B Metering Valve 5 Measuring Tank 6 Liquid Level Sensor 6a Liquid Volume Signal 21 Prescription Management Means 21a Update Signal 21b Update Signal 22 Viscosity / Flow Rate Correction Data Storage Means 22a Viscosity / Flow rate correction data 23 Metering system correction data storage means 23a Metering system correction data 24 Correction calculation means 25 Process control means 25a Signal 26 Metering control interface I Set value X Corrected target value

Claims (1)

[Claims] 1. A metering valve 4A, 4B for supplying and shutting off a liquid supply for metering, and the metering valve 4
A measuring tank 5 that receives liquid supply from A and 4B, a liquid amount sensor 6 that detects the amount of liquid in the measuring tank 5, and a control computer 2. The control computer 2 performs process control for executing the overall control. Means 25, prescription management means 21 for outputting the set value I for measurement, viscosity / flow rate correction data storage means 22 for previously storing viscosity / flow rate correction data 22a, and measurement system correction data 23a are stored in advance. And a correction calculation means for giving a corrected target value X to the process control means 25 based on the measured set value I and the viscosity / flow rate correction data 22a or the measured system correction data 23a. 24 and the process control means 25 to send and receive signals to and from the liquid amount sensor 6
A liquid metering device 1 comprising a metering control interface 26 which receives a detection value output from the metering valve 4A, 4B and sends a driving signal to the metering valves 4A, 4B to drive the metering valve 4A, 4B.