JPS63283730A - Liquid metering and mixing apparatus - Google Patents

Abstract

PURPOSE:To accurately measure many kinds of raw liquids by varying the divergence of respective regulating valves in accordance with the received liquid variables on the liquid receiving vessel side in case of cumulatively metering a plurality of liquids from a plurality of vessels into a liquid receiving vessel and mixing. CONSTITUTION:When N chemicals are used for a group M of liquids which make no pollution problems or the like between the liquids to be metered cumulatively, liquid receiving vessels 4 and metering devices 5, each two units, are provided for a plurality of feeding liquid vessel 1. The liquid receiving vessels 4 can be transferred by an unmanned truck 9 and is operated efficiently by minimizing fixed pipings. When metering, the opening of opening regulating valves 2 is regulated basing on the deviation and deviation variability with time computed between the weight of raw liquid sensed by the metering devices 5 and the metering set values. In other words, after starting metering, the opening of the divergence regulating valve 2 is drawn when metering deviation gets smaller and generate micro-flow rate, and the metering accuracy is not dependent on the flow rate variations and enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid measuring and mixing device for preparing a new liquid mixture by measuring and mixing various types of raw material liquids. In particular, the present invention relates to a liquid measuring and mixing device that precisely and efficiently measures and mixes raw material liquids having a wide measuring range.

[Conventional technology]

Conventionally, as a measuring device applied to a liquid measuring and mixing device,
In order to achieve highly accurate metering, a metering device is used that is not equipped with a variable supply liquid flow rate, but rather is limited to a flow rate that corresponds to a metering setting value.

In addition, in conventional liquid measuring and mixing devices, when supplying liquid from multiple supply liquid containers to one receiving container,
A metering device is provided associated with each supply liquid container.

For example, when a volumetric type is used, two measuring devices are used for the ASB liquid two-liquid container, as shown in Figure 8, and the control is performed to predict and control the amount flowing into the mixing container. The device requires two loop control functions.

That is, since the flow rate of the supplied liquid varies depending on the amount of liquid A and B in the supply container, pulp flow rate characteristics, liquid physical properties, etc., highly accurate metering cannot be expected with the same control function.

The same applies to the tank metering system, and the shutoff valves of the actuators attached to each prefecture must be controlled by independent loop control systems. (Unexamined Japanese Patent Publication No. 57
-29114, JP-A-58-163426, JP-A-56-74715, and other publications) In addition, in order to achieve high-accuracy metering, valves with different flow rates are installed in parallel to maintain a predetermined metering deviation. There is a method of switching between the two loops, but even in this case, two-loop control is required as a control function.

The expression "two-loop control function" is used here because, for example, when a distributed control device is used, processing can be performed within one control device, and two control devices are required. This is because it cannot be said. However, in terms of the number of input/output points and software, it can be said that there are two control devices.

Further, in a batch manufacturing process, when a large number of chemical solutions are used, it is often impossible to perform cumulative measurement in the same container because these liquids have different physical properties. Therefore, the manufacturing system has a plurality of wave receiving containers as shown in FIG. 7, and liquid types that can be mixed are measured in the same container, and liquid types that cannot be mixed have separate measuring containers. Therefore, a preparation tank 10 for reaction, preparation, etc. is required on the downstream side.

In a production system with a fixed adjustment tank 10 for reaction preparation, etc., when manufacturing a wide variety of products, it is necessary to install equipment according to the content of the products. Therefore, a large number of measuring tanks, preparation tanks, and their attached piping measuring devices, control devices, attached valves, etc. are required. In this case, some equipment is used for one type of equipment but not for another, resulting in a very wasteful system and an increase in the initial cost of the equipment. Furthermore, although multi-purpose manufacturing systems have been in demand in recent years, fixed manufacturing systems require changes to the piping system and associated equipment, resulting in a more complex manufacturing system than is currently the case. .

Therefore, in recent years, a mobile batch manufacturing system has been proposed in which the measuring tank or the preparation tank is made mobile to reduce the need for measuring devices.

However, when this system is adopted in a conventional weighing device, the measurement time differs depending on the size of the measurement setting value, and the larger the measurement setting value, the longer it takes to weigh, and the time required to transport the volume in a mobile manufacturing system. will be subject to restrictions. For this reason, in conventional manufacturing systems, a necessary number of weighing devices are installed in order not to impose restrictions on transportation time, but this contradicts the advantages of mobile manufacturing systems. Moreover, such a system results in a further extension of the stay time in Stage 1. (A large number of measuring devices are required due to the small measuring range, limited measuring time, and conditions for measuring accuracy. Therefore, the operation time for connecting pipes, etc. increases.) Manufacturing of photographic light-sensitive materials Since photosensitive materials are handled in the process, they must be kept light-shielding.
The complexity of the system due to the increase in the number of joints and the change in the conveyance cycle affect the performance of the product.

[Problem that the invention seeks to solve]

Conventional liquid metering and mixing devices have the following drawbacks because the metering control is based on the assumption that the flow rate of the supplied liquid is constant.

■Total Mta degree: Accuracy may not be guaranteed due to fluctuations in flow velocity due to disturbances or changes in liquid physical properties.

That is, in the case of gravity transfer, for example, if there is a large change in the amount of liquid remaining in the supply side container, the flow rate will be outside a certain range of conditions, resulting in poor measurement accuracy.

Additionally, this means that it is necessary to limit the flow rate of the supply liquid container within a certain range and ensure that the liquid volume is always above a certain level.
This caused a loss of the remaining liquid in the supply liquid container, increasing running costs.

■Measuring range: The measuring range is narrow.

The reason for this is that even if the metering is stopped, there is a flow amount due to the response delay of the system, and this amount is determined by the flow rate of the feed liquid, so if the flow rate is constant, narrowing the metering range will allow for an allowable flow amount. guaranteed. Therefore, even if the same liquid is to be measured, if the measurement setting values are significantly different, measuring devices each having an appropriate measurement range are required, which increases the number of devices.

■Measuring time: Measuring time is affected by the measurement settings.

If the measurement setting value is small, the measurement time is short; if it is large, the measurement time is long. Therefore, a measuring device with a measurement time suitable for the manufacturing cycle is required according to the measurement setting value, and the number of devices increases.

Furthermore, conventional liquid measuring and mixing devices
A large number of independently controlled metering devices are installed for each supply liquid container, and each is installed at each optimum metering time due to manufacturing capacity limitations, which complicates the system and requires a large number of metering devices. It has been equipped.

In addition, in conventional measuring methods, volumetric measuring methods such as oval flowmeters are often used, and during use, it is necessary to fill the piping with liquid, which has the problem of causing loss of raw material liquid. .

The object of the present invention was achieved based on the above circumstances, and
We use a metering control device that achieves high-precision metering that is not affected by flow rate fluctuations due to disturbances or changes in liquid physical properties, secures a wide metering range, and realizes short-time metering without being affected by the size of metering settings. , This allows the system to be configured, simplifying equipment, increasing manufacturing capacity, and reducing raw material loss. ■Reducing initial costs by reducing the number of devices.■Reducing the number of maintenance tasks by reducing the number of devices.■By reducing the number of devices. Reducing failures through improved reliability - Our objective is to provide a highly economical liquid measuring and mixing device that reduces running costs by reducing raw material loss.

[Means for solving problems]

The above-mentioned object of the present invention is to provide an apparatus for cumulatively measuring a plurality of liquids from a plurality of supply liquid containers and receiving and mixing the liquids in a wave receiving vessel, the apparatus having a measuring device for measuring liquid from the supply liquid containers on the side of the wave receiving vessel. , the supply liquid metering control device is a closed-loop control precision metering control device that measures the supply liquid by changing the opening degree of the opening adjustment valve by fuzzy reasoning in response to the supply liquid measurement value, and changing the supply liquid flow rate; This is achieved by a liquid metering and mixing device characterized in that it has a wave container displacement device.

Components of the present invention will be explained in detail.

(1) Supply liquid container: a container that stores the supply liquid to be measured;
The capacity of the container requires a scale suitable for manufacturing. In the present invention, there is no limit to the amount remaining in the feed liquid solution container, and theoretically the remaining amount can be measured to zero. Also, physical property values of the liquid (e.g. viscosity, etc.)
Any liquid can be measured to zero remaining amount as long as it has physical properties that allow it to flow out without being affected by this.

(2) Opening degree adjustment valve: This is a flow rate control valve that has the number of opening degree adjusting valves corresponding to the number of supply liquid containers, and changes the supply liquid flow rate over a wide range by changing the opening degree of the valve. . Also,
The flow rate characteristics of the valve are such that the valve is fully closed when the opening degree is around 0%, and the liquid flows from around 10%. A flow rate characteristic of 10% or more has characteristics other than quick open characteristics.

The drive may be, for example, an AC servo motor, etc. (3) Receiving container: A container with a capacity suitable for the manufacturing scale. For liquids that can be mixed, measure by cumulative measurement. If the liquids are washed after each transfer, even if they cannot be mixed, they can be measured individually in the same container. It is also possible to perform stirring and mixing in this container.

(4) Measuring device: Cumulative metering is possible in which liquids from a plurality of supply liquid containers are measured by one measuring device installed on the receiving vessel side. Tank measurement methods such as load cells, differential pressure transmitters, and level meters are used.

There are cases where it is attached to the supply liquid container, and cases where the supply liquid container is placed on a weighing platform.

(5) Metering control device: This is a closed-loop controlled precision metering device that changes the flow rate, and uses a control method based on fuzzy inference to make the opening degree of the opening adjustment valve variable. That is,
The initial opening degree of the valve is determined by the flow rate characteristics of the valve and the metering setting value, and the subsequent transition of the valve opening degree is performed by fuzzy control based on the supplied liquid metering value and the metering setting value. By providing a switching device, it is possible to cumulatively measure a plurality of liquids in the same wave receiving container using at least one measuring device, and the number of devices can be reduced.

(6) Switching device: A device for controlling a plurality of opening adjustment valves with one drive control device, and is part of the configuration of a metering control device. This eliminates the need to install a metering control section and a drive control section for each opening adjustment valve.

(7) Moving device: A moving device for transporting the wave receiving container. Transportation methods include automatic guided vehicles, conveyors, and the like. Further, as the conveyance object, there are cases where the wave receiving vessel itself has a conveyance function, and cases where the wave receiving vessel is separated from the wave receiving vessel.

The basic components of the present invention are as described above, and the basic component is the use of a closed-loop metering control device that varies the flow rate, and the metering control device performs fuzzy control.

In addition, various auxiliary devices may be installed.

For example, a spray ball or the like is installed in each container for cleaning, and a switching valve is installed in the middle of the piping. Also, set up a stirrer in each container for mixing. Additionally, hot water from a constant temperature bath, etc. will be circulated to maintain heat.

[For production]

The present invention is an apparatus for cumulatively measuring a plurality of liquids from a plurality of supply liquid containers and receiving and mixing them in a receiving vessel, the supply liquid container having an opening adjustment valve in the supply liquid piping, A liquid measuring device is provided on the side of the wave receiving vessel, and a feed liquid metering control device is configured to correspond to each measured value of the feed liquid, and change the opening degree of each of the opening adjustment valves by fuzzy reasoning to change the flow rate of the feed liquid. This is a precision metering control device with a switching device for closed-loop control, which measures the amount of liquid using a closed-loop control, and also has a moving device for a receiving container. On the other hand, it is now possible to use only one opening adjustment valve for one type of supply liquid container, regardless of the size of the measurement range, and at least it is possible to use multiple supply liquid containers that can be mixed and cumulatively metered together. In contrast, by using a connecting pipe, measurement can be performed with one receiving vessel (measuring tank), one measuring device, and one metering control device with a switching device, which greatly simplifies the device and allows each supply liquid container to be It is possible to accurately measure liquids in a short time.

Furthermore, by providing a moving device for the wave receiving container, (1) the supply liquid piping for each supply liquid container can be simplified without using a connecting pipe, reducing the need for cleaning and simplifying the equipment. ■Since the wave receiving container (measuring tank or measuring pot) is movable, measured liquid can be distributed to all adjustment tanks without fixed piping, so the number of wave receiving containers can be reduced and equipment flexibility can be achieved.

Therefore, when manufacturing a wide variety of products, it is possible to eliminate idle equipment on the receiving vessel side, and it is also possible to respond to changes in treatment and the like by minimizing the need to add equipment. (2) Also, since the measurement cycle can be sped up by moving the wave receiving container (measuring pot), changes over time can be suppressed by preparing a small amount of liquid. (1) A stirrer is attached to the tank for measuring the liquid from the supply liquid container, which can also be used as a reaction tank [Embodiment] The embodiment of the present invention will be explained in more detail with reference to the drawings.

As shown in FIG. 1, let us consider the case where there are M groups of liquids in which accumulated contamination among liquids is not a problem, and each group contains N chemicals. Assume that there are a large number of products to be manufactured, but the total number of chemicals used for each product is below MXNXN. Conventional manufacturing systems, whether mobile or fixed, require a chemical supply liquid container 1 and a measuring device 5 exclusively for the same type of product, due to the measuring range, measuring time, and measuring accuracy. The number of devices has increased. However, in the present invention, a closed-loop metering control device with variable flow rate is adopted, and since the metering control device performs fuzzy control, there is no need to worry about the metering range, metering time, and metering accuracy. The number of measuring devices 5 may be MXN, and as long as there is no problem of liquid contamination, the number of measuring devices 5 may be very small determined based on the conveyance capacity.

Here, A, 82 weighing devices 5 (load cells) are assumed. The number of supply liquid containers 1 may be MXN, but since the number of measuring devices 5 is determined based on the chemical preparation time, manufacturing scale of the product, etc., the number of supply containers 1 may be larger than that. It may be necessary.

Each metering device has a metering control device 6 having the contents of the control block shown in FIG. is selected and output. That is, a large number of chemicals (1 to N) are measured in the same wave receiving container 4 (measuring pot) using the same control algorithm.

As shown in FIG. 3, the opening adjustment valves 2 (1 to N) each have an equal percentage flow rate characteristic, and are fully closed when the valve opening is around 0%, and the liquid starts to flow from around 10%. It has the property of flowing out.

The metering control device 6 includes a filter calculation section 61, a fuzzy control section 62, and a drive control section 63.
Fuzzy control is performed based on the flow rate characteristics of the opening adjustment valves 2 (1 to N), the measured value obtained by the metering device 5, and the measurement set value, and the opening of the opening adjustment valves 2 (1 to N) is performed. Control the degree.

Next, the operation process of the liquid measuring and mixing device of the present invention will be explained.

The higher-level manufacturing control device issues an instruction to, for example, an automatic guided vehicle 9 to transfer the weighing pot A of the wave receiving container 4 to the station 1.

Further, an instruction is issued to the measuring device 5 (load cell A) to measure the chemical in a predetermined supply liquid container 1 (for example, tank 12). The switching device 7 switches according to the system selection signal,
The opening adjustment valve 2 (12) and the shutoff valve 3 (12) of the selected tank 12 are provided so as to be controllable by the metering control device 6.

Further, the higher-level manufacturing control device issues an instruction to connect the coupling device 12 of the supply liquid container, which is an auxiliary device, to the coupling device section of the wave receiving container 4 (measuring pot A). When preparation for weighing is confirmed through such an initial state, a command to start weighing is given from a higher level.

In response to the measurement start command, the shutoff valve 3 (12) is opened, and a position command is transmitted from the measurement control device 6 so that the opening adjustment valve 2 (12) has a predetermined opening degree.
Driving the drive motor 8 (12) of the tank 12 and setting the valve boat of the opening adjustment valve 2 (12) at the indicated position to adjust the opening and cause the flow of the raw material; The initial opening degree of the valve is calculated by the fuzzy control unit 62 of the metering control device based on the flow rate characteristics of the valve and the metering setting value based on fuzzy rules. As a result, the raw material in the tank 12 begins to be transferred to the wave receiving container 4.

Measuring device for the tank 12! 5 (load cell A) detects the weight of the transferred raw material and feeds back the value to the weighing control device 6.

In the metering control device 6, the fuzzy control unit 62 calculates the deviation from the metering set value from the fed-back measured value of the supply liquid.
In addition to calculating the amount of change over time in the deviation, a value obtained by performing low-pass filter processing on these amounts is calculated. The fuzzy control unit 62 performs inference calculations based on fuzzy rules based on this calculated value, and obtains a valve opening that will provide an appropriate flow velocity in the next control cycle.

At this time, the membership function based on fuzzy inference has a shape as shown in Figure 4, in which the division of the axes corresponding to the physical quantities of the deviation amount and the deviation time change amount is, for example, semi-logarithm, in which the sections of small physical quantities are finely divided. . This is for the purpose of improving measurement accuracy and short-time measurement.If the amount of deviation is large, it is not necessary to have good controllability, but if the amount of deviation is small, it is necessary to improve control accuracy. Because there is. This also applies to the -order filter processing function, which uses the deviation amount, etc. of the first-order filter when the deviation amount, etc. is small,
Weighing accuracy is improved by relaxing the dynamic characteristics of the weighing detector.

After the measurement starts, when the measurement deviation becomes small, the opening adjustment valve 2 (
In 12), the opening degree is narrowed down to a minute flow velocity.

When the measurement deviation and the time change amount of the measurement deviation become small and the measurement deviation becomes less than a certain value, the measurement is stopped and the shutoff valve 3 (1
2) moves in the fully closed direction. At this time, the flow velocity is minute and the amount of inflow is minute. Therefore, the amount of flow after the metering is stopped becomes small, and the metering accuracy is improved regardless of the flow velocity fluctuation. Further, the opening adjustment valve 2 (12) has a third opening adjustment valve 2 (12).
By having the flow rate characteristics shown in the figure, the valve opening changes at about 10% based on fuzzy inference calculations when the deviation is near 0.

Therefore, even if there is mechanical backlash of the valve, the dead zone and fuzzy control system absorb the negative effects of the backlash and allow highly accurate metering. Furthermore, in the measurement range,
The operation of the opening adjustment valve changes depending on the measurement setting value and the process system, and regardless of the size of the measurement setting value, measurement can be performed with the same measuring device, expanding the measurement range. Also, during the measurement time, the operation pattern of the opening adjustment valve changes, and regardless of the magnitude of the measurement setting value, almost the same short-time measurement can be performed.

After performing the above-mentioned operations according to the product type and measuring all the chemicals in the product type, the process moves to the operation of transferring the liquid to the preparation tank in the downstream process.

When an instruction to move to station 3 is issued from the higher level, the automatic guided vehicle 9 transports the wave receiving container 4 (weighing pot A) to the station 3. ``Then, it is connected to the piping connection device. If the adjustment tank 10 is a moving device as shown in FIG. 1, this adjustment tank 10 will also be moved and connected to the lower part of the pipe connection device.

After the connection is confirmed, the bottom valve of the wave receiving container 4 (measuring box) A) is controlled by the transfer control device, opens, and the liquid is transferred.

In Fig. 1, a weighing device 5 is placed at a station 1.2 (a load cell is placed), and the weighing system is carried at a predetermined position by an automatic guided vehicle 9. 4 (the measuring pot) itself is the measuring device 4 and the wheel 10
It may also be of a type that has a zero carrying function. With this configuration, compared to FIG. 1, the coupling device is not fixed to the station, however, an electrical connection device such as a position detection sensor is required at each coupling position.

As shown in Figure 5, a stirrer 10 is placed in the wave receiving container 4 (measuring pot).
1 blade section is added, and the wave receiving vessel 4 is agitator station 1.
If the wave receiving vessel 4 is provided with functions such as mixing and reaction and positioned as a regulating tank, a more efficient system can be achieved.

In the embodiment described above, a load cell was used as an example of the weighing device 4 for weighing, but the same effect can be applied even if other tank weighing type weighing devices are used. In particular, if a differential pressure transmitter or the like is used in the tank in Figures 4 and 5, the wave receiving container (measuring pot) can be fixed to the mobile vehicle, making it easier to manufacture the wave receiving container, and reducing vibrations. The influence of will disappear.

By using a metering control device that has the functions of additive metering in the receiving vessel 4 (measuring pot) and subtractive metering by attaching a metering device to the supply liquid container 1 (tank), a wider range of precise metering is possible. Become.

〔Effect of the invention〕

A device according to the present invention that cumulatively measures a plurality of liquids from a plurality of supply liquid containers and receives and mixes them in a wave receiving vessel, wherein the supply liquid container has an opening adjustment valve in the supply liquid piping, and the liquid from the supply liquid container is A liquid measuring device is provided on the receiving vessel side, and the feed liquid metering control device changes the opening degree of each of the opening adjustment valves according to each measured value of the feed liquid by fuzzy reasoning to change the flow rate of the feed liquid. The system employing the control device of the present invention is a precision metering control device equipped with a switching device for closed-loop control for metering, and further includes a moving device for a receiving vessel. Highly accurate measurement that is unaffected by flow rate fluctuations can be achieved.1. In addition, even in a wide measurement range, the measurement time can be shortened and quickly made possible.

Furthermore, the equipment has been simplified and the number of weighing devices has been reduced, increasing manufacturing capacity even with large-scale equipment, improving product quality through large-scale preparation, and reducing loss of raw materials. This resulted in lower initial costs, lower maintenance costs, lower running costs, and improved reliability.

[Brief explanation of the drawing]

Fig. 1 is a flow sheet of one embodiment of the liquid metering and mixing device of the present invention, Fig. 2 is a block diagram of closed loop control according to the present invention, Fig. 3 is a flow rate characteristic diagram of the opening adjustment valve, and Fig. 4
5 is a flow sheet showing another embodiment of the present invention,
FIG. 6 is a diagram explaining the membership function of fuzzy control, and FIGS. 7 and 8 are flow sheets of one embodiment of a conventional liquid metering and mixing device. 1... Supply liquid container 2... Opening adjustment valve 3... Closing valve 4... Wave receiving container 5... Measuring device
6... Metering control device 7... Switching device 8...
Drive motor 9...Automated guided vehicle 10...Adjustment tank Agent Patent attorney (8107) Kiyotaka Sasaki Figure 6

Claims (1)

[Claims] A device for cumulatively measuring multiple liquids from a plurality of supply liquid containers and receiving and mixing them in a receiving vessel, the supply liquid container having an opening adjustment valve in the supply liquid piping, and measuring the liquid from the supply liquid container. A closed system in which a device is provided on the wave receiving vessel side, and a supply liquid metering control device changes the opening degree of each of the opening adjustment valves according to each measured value of the supply liquid by fuzzy reasoning to change the flow rate of the supply liquid and perform measurement. 1. A liquid measuring and mixing device, which is a precision metering control device with a switching device for loop control, and further includes a moving device for a wave receiving container.