JPS63274439A - Liquid and powder weighing and mixing apparatus - Google Patents

Abstract

PURPOSE:To always keep stable weighing accuracy, by a method wherein flow speed controllers are respectively provided to a plurality of liquid and powder supply containers while a cumulative weighing detector is provided on the side of a receiving container to control the flow speed controllers on the basis of an actually weighed value and a weighing set value. CONSTITUTION:For example, in a weighing and mixing apparatus for weighing and mixing N-kinds of liquids and one kind of a powder, a weighing set value is set to a weighing control apparatus 44 on the basis of a given manufacturing condition and, when weighing start is indicated, a powder storage hopper 30 is operated at first through a change-over apparatus 46. That is, a screw feeder 32 is rotated in the predetermined number of rotations by the driving of a servo motor 31 and a powder is transferred to a receiving container 40. The load cell 42 of the receiving container 40 detects the wt. of the transferred powder and the value thereof is fed back to a weighing control part 44a which in turn operates the next number-of-rotation order from the deviation with the set value to perform the alteration control of a flow speed. In the same way, liquid tanks are successively controlled by opening degree control valves.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a liquid/powder product that manufactures new materials by supplying many types of powders and liquids into one container, measuring them, and then mixing and reacting them. The present invention relates to a body weighing and mixing device.

(Prior art) Conventionally, in order to achieve high precision measurement, there has been no measuring device applied to liquid/powder measuring and mixing devices that has a variable flow rate, but a metering device with a limited flow rate has been used. There is.

In addition, when considering a system that measures liquid and powder separately, and then mixes, reacts, and prepares them in a downstream mixing container,
In the conventional apparatus, liquid and powder were measured using separate measuring devices as shown in FIG. 4, and then added to a downstream mixing container. Therefore, it is necessary to construct a system using different measuring methods such as gravimetric measuring for powder and volumetric measuring for liquid.

In addition, in order to achieve high-accuracy metering, norupu with different flow velocities are installed in parallel and switched at a predetermined metering deviation (for example, JP-A-56-74715, JP-A-58-163).
426) method, or a device having a function of changing the flow rate to two fixed conditions is installed, and the change is made at a predetermined measurement deviation (for example, Japanese Patent Application Laid-Open No. 57-72
However, in either method, the control function naturally requires two loops of control, which complicates the system configuration.

In other words, the reason why such an independent control system is required is because the flow rate of the powder added to the measuring container during measurement varies depending on the measurement setting value, the amount of powder in the supply container, the physical properties of the powder, etc. However, even when measuring and mixing the same object, such as liquid or powder, highly accurate measured values cannot be obtained using the same control function all the time.

(Problems to be Solved by the Invention) Conventional liquid and/or powder metering and mixing devices have the following drawbacks because the metering control is based on a constant flow rate.

■Measuring accuracy: Accuracy may not be guaranteed due to fluctuations in flow velocity due to disturbances and changes in the physical properties of liquids and powders.

In other words, in the case of gravity transfer, for example, the liquid in the supply container
The flow rate of the powder and liquid flowing down varies depending on the amount of powder remaining, but if the change in the remaining amount is large, the flow rate goes outside a certain range of conditions, so accuracy was reduced.

This also indicates the need to limit the amount of powder and liquid in the supply side container to a certain level, and to always ensure that the amount of powder and liquid is above a certain level. This caused losses and increased running costs.

Furthermore, in the case of hygroscopic powder or powder that is prone to bridging, the fluidity of the powder differs depending on the storage environment conditions. Therefore, in a system that is used while being stored in a supply container, the powder may be affected by changes in environmental conditions (e.g., temperature, humidity, auxiliary equipment for promoting powder fluidity, vibrations caused by ζibrators, air knockers, etc.). The fluidity of the body changes. For this reason, measurement accuracy is deteriorated under different flow velocity conditions.

■Measuring range: The measuring range is narrow.

The reason for this is that even if the metering is stopped, the amount of inflow remains due to the response delay of the system, and this amount is determined by the flow velocity. Therefore, when the flow rate is constant, the allowable inflow amount can be determined by narrowing the metering range. Guaranteed. Therefore, even when measuring the same liquid powder, measuring devices each having an appropriate measuring range are required, and the number of devices increases.

■Measuring time: Measuring time is affected by the measurement setting value.

If the metering setting value is small, the metering time will be short; if it is large, the metering time will be long. Therefore, a measuring device suitable for the manufacturing cycle is required depending on the measured value, and the number of devices increases.

■Equipment: Measuring equipment becomes more complex and the number of devices increases.

It is necessary to set a flow rate suitable for the metering device, and a metering control device appropriate for the set flow rate value is required, which increases the number of devices.

In addition, in conventional devices, there is no shared measuring device for liquids and powders, and separate measuring devices are required for liquids and powders.
The number of weighing devices will increase.

The object of the present invention was achieved based on the above circumstances, and
Achieves high-accuracy measurement that is not affected by flow rate fluctuations caused by external disturbances or changes in the physical properties of liquids and powders, secures a wire range measurement range, and achieves short-time measurement without being affected by the size of the measurement setting value. The system is configured using a weighing control device that simplifies equipment, increases manufacturing capacity, and reduces raw material loss. ■ Reducing initial costs by reducing the number of devices ■ Reducing maintenance man-hours by reducing the number of devices ■ Reducing failures by improving reliability by reducing the number of devices ■ Providing a highly economical liquid/powder measuring and mixing device that reduces running costs by reducing raw material loss.

(Means for Solving the Problems) The above object of the present invention is to apply a metering control device that changes the flow rate from time to time by closed loop control when measuring powdery fluid to be measured, and to This is achieved using a liquid/powder measuring and mixing device that can reduce the number of equipment. Therefore, the basic components of the present invention are as follows:
The powder metering and mixing device is configured.

1) Supply container: A container that stores the raw material liquid or powder 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 container;
It is possible to measure up to to. In addition, any liquid or powder can be used without being affected by the physical properties of the raw material (e.g., viscosity for liquids, particle size for powders, etc.) as long as it has physical properties that allow it to flow out. It is possible to measure up to .

2) Flow rate control device: It has a number of flow rate control devices corresponding to the number of supply containers. For example, in a screw feeder, the flow is controlled by commanding the rotation speed. A damper is a flow rate control device that changes the flow by changing the opening degree, and is used for powder, but for liquids, there are opening adjustment valves and the like.

Examples of the driving means include an AC radar, a motor, and the like.

3) Receiving container: A container with a capacity suitable for the manufacturing scale.

4) Detector 2 This is a device that observes moment-to-moment changes in measured values, and is attached to a receiving container. For raw materials that can be mixed, it is possible to cumulatively measure multiple materials in the same container.

5) Metering control device: A precision metering control device with closed-loop control that changes the flow rate.With one metering device,
Enables measurement of each powder and liquid.

6) Switching device: A device for controlling multiple flow rate controllers with one drive control device. Although it is not necessary when the flow rate control device includes a drive control device, it is provided in the present invention in order to reduce costs.

7) Stirrer: stirs and mixes the cumulatively measured powder fluid.

The basic component of the present invention is the above-mentioned system, but there are various types of flow rate controllers that vary the flow rate of powder. A screw feeder that changes the flow by commanding the rotation speed, a rotary type feeder, and if the powder has good fluidity, a device that changes the flow by varying the opening with the position command at opening Dan A. There is. Additionally, there are shutter gates and the like that stop the flow.

Further, in the present invention, various auxiliary devices may be installed for measuring and mixing liquids and powders, cleaning, etc. For example, a spray d-rule or the like is installed in a measuring container, a liquid stock tank, etc., and a switching valve is installed in the middle of the piping. Also, install a stirrer in each container for mixing. Furthermore, to maintain the temperature, hot water is circulated from a constant temperature bath, etc.

(Embodiment) Embodiments of the present invention will be described in detail below (with reference to the drawings).

One embodiment of FIG. 1 shows a metering and mixing device for N types of liquids and one type of powder.

That is, in this embodiment, the supply container is arranged on the upstream side, N tanks filled with raw material liquid and one storage tank filled with raw material powder are arranged downstream as a receiving container, The raw materials are each fed into one weighing tank equipped with a weight detector, and the cumulative weight of the raw materials is calculated as 1.
The case where preparation is performed by transferring to a post-preparation tank is shown.

Tank l filled with raw material liquid, 2. ..., N (however,
In this embodiment, N≦9. ) are connected to the liquid supply pipes, respectively, by serze motors 61, 62 . ....

Opening adjustment valves 11, 12 . ....

IN and shutoff valves 21.22. ..., 2N are arranged in the j@th order.

Further, the tanks 1, 2. ..., N is the shutoff valve 21゜2
2, . . . , 2N output to the receiving container 40.

On the other hand, the storage hopper 30 filled with raw material powder has a supply pipe connected to a shutter gate 33 via a screw feeder 32 driven by a servo motor 31, and the gate output is guided to the receiving container 40 by the pipe. has been done.

A load cell 42 is arranged in the receiving container 40 as a detector for measuring the weight of the liquid and powder transferred from each supply container.

The load cell 42 is connected to a weighing control device 44 through a load cell amplifier 43, and the weighing control device is connected to a switching device 46 via a Q2 Drino S45.

The switching device 46 switches based on a command from the control device 440, selects one of the raw material supply systems, and switches and outputs a control signal issued from the control device.

A preparation tank 48 is arranged downstream of the receiving container 40 through a bottom valve 47, and a stirrer 49 is connected to the preparation tank 48.
is located.

Regarding the transfer of powder to the receiving container and to the preparation tank, in order to promote the fluidity of the powder, an iblator or aeration device is used in the storage container and receiving container, although not shown. has been done.

Next, the measuring and mixing process of the powder measuring device configured as described above will be explained using the control block diagram of FIG. 2 as well as the WJ1 diagram.

First, the measurement control device 44 is given manufacturing conditions such as designation of a supply container that receives raw materials and setting of the measurement order of target raw materials in a receiving container.

When the metering setting value is set in the metering control device 44 and the start of metering is instructed, the switching device 46 switches to the first selected supply system, in this case, the metering of powder is carried out first, and the storage hole A30 is switched. The shutter gate 33 is opened, and a rotation speed command is transmitted from the metering control device 44 to the Serze Dry/45 to drive the Serze motor 31 so that the screw feeder 32 transfers the powder at a predetermined rotation speed. Rotate the screw feeder to the indicated rotation speed and cause the flow of raw materials. This allows storage of 30
The raw materials begin to be transferred to the receiving container 40.

The load cell 42 of the receiving container 40 detects the weight of the transferred raw material, and sends the value to the weighing controller 44a via the load cell amplifier 43.

The metering control unit 44a calculates the deviation from the set value, the time change of the deviation, etc. from this actual weight value, and obtains the next appropriate flow rate based on a control method such as fuzzy control, optimal control, learning control, etc. A speed command (rotation command) is calculated. Then, in the next control cycle, an appropriate rotation speed command is given to the screw feeder 32 to change the flow speed.

As described above, the rotation speed of the screw feeder is controlled in a closed P loop (FIG. 2) at a predetermined control period based on the observed amount of the load cell 42, and as a result, the flow velocity is controlled.

When the measurement deviation becomes small, the rotation speed of the screw feeder becomes small and the flow velocity becomes very small. When the amount of change over time in the metering deviation and metering deviation time becomes small and the metering deviation becomes less than a certain value, metering is stopped, the shutter gate 33 is closed, the rotation speed of the screw feeder becomes 0, and the rotation is stopped. 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, in the measurement range, the operation of the screw feeder 32 changes depending on the measurement setting value and the process system, so that regardless of the size of the measurement setting value, the same weighing device can perform measurement, and the measurement range is expanded.

However, it is within the static accuracy of the detection end.

Also, during the measurement time, the operation pattern of the screw feeder 32 changes, and regardless of the magnitude of the measurement setting value, almost the same short-time measurement can be performed.

Next, the total amount tK of the liquid in tank 1 to be mixed is changed. The switching device 46 switches, and the opening adjustment valve 1 on the tank l side
1 opens to a predetermined opening degree and the shutoff valve 21 opens, the raw material in the tank 1 is supplied to the receiving container 40. The measurement setting value is set in advance, and cumulative measurement is performed according to the measurement start command under the same control as in the case of powder. The control functions within the metering control device are the same, and the control signal is transmitted through the switching device 46.
The signal is switched by υ and output to the opening adjustment valve 11 and the shutoff valve 21 at the operating end. At this time, the control output is converted from the rotational speed into a position command value corresponding to the valve opening degree and output. That is, the metering control section 44a determines whether it is a rotational speed output or a position output based on the system selection signal command and switches the output, and in the case of a position output, the control signal is sent to the drive control section ( Boo/Dry etc.) Output to 45.

The liquids are sequentially supplied to the selected tanks, and when the cumulative measurement of the plurality of raw material liquids in the receiving container 40 is completed along with the powder that has been supplied first, the bottom valve 47 of the receiving container 40 is opened, and the liquid powder is prepared. Introduced into tank 48. In the preparation tank 48,
The agitator 49 is driven to perform mixing, and when the agitation is completed, the liquid powder is discharged.

Next, the results of experiments conducted based on the present invention will be described.

In this experiment, the measuring device shown in FIG. 1 had a liquid storage tank 1 and a powder storage hole A30, and the receiving container 40 was used to sequentially measure the amount.

The resulting weighing device can measure up to 9 times out of 10, and the accuracy of the low P cell is 1/5000. In the liquid measuring system, the position of the opening adjustment valve 11 is controlled by the sirze motor 61, in the powder measuring system, the rotation speed of the screw fee/32 is controlled by the sirze motor 31, and in liquid metering, the position command is sent from the metering control device. Surf motor 61 with output switching device
In powder measurement, the surf motor 31 is driven by a rotation speed output switching device.

Figure 5 shows 1 k of the liquid at that time (water was used in the experiment).
gWeighing results are shown. Further, Fig. 6 shows the results of 5001 measurements of powder. As is clear from Figures 5 and 6, although the operation pattern of the operating device (liquid: opening adjustment valve, powder varnish feeder) changes, highly accurate measurement results can be obtained in approximately the same measurement time. Ta.

In addition, in the case of liquids, we used different storage tank levels and opening adjustment valves with different flow characteristics to check the effect on flow rate changes, but we obtained highly accurate measurement results using the same control method. . Furthermore, in the case of powder, we applied vibration to the storage container to compress the powder and change its fluidity, making changes to the flow characteristics.Although the operation pattern of the screw feeder is of course different, the metering time, The same results were obtained for both measurement accuracy.

FIG. 3 shows a modification of the invention.

In this modification, incidental equipment for preparation such as a stirrer 51 is arranged in the receiving container 50, so that the receiving container 50 also serves as a preparation tank. Therefore, the raw material supply system upstream of the receiving container 50 has the same configuration as that described in the previous embodiment. With this configuration, the system can be simplified. However, on the other hand, if the system contains raw materials that cannot be subjected to a series of processes such as measurement, mixing, and reaction in the same container, the versatility of the system decreases.

In addition, as other modified examples of the present invention, there is an addition measurement method in which a detector is installed in the receiving container to measure the amount as described in the previous embodiment, and a detector is installed in the supply container separately to measure the flow rate. It is also possible to combine it with the subtraction weighing method.

By providing in this manner, for example, by performing minute measurements using subtraction weighing and weighing items with large measurement settings using additive weighing, it is possible to perform measurements over a wider measurement range.

Further, as another modification of the present invention, downstream of the receiving vessel (m
A preparation tank equipped with K can be provided in a mobile manner. In the metering and mixing device provided in this manner, the above-mentioned metering device applied thereto can realize metering in a short time, so that the metering time does not limit the conveyance capacity of the preparation tank.

Furthermore, in a large system equipped with multiple receiving containers or preparation tanks, the piping can be simplified and the versatility can be improved. Note that the load cell mentioned in the previous embodiment can be used as a detector that can be applied to the present invention. In addition to the above, there are various types of detectors. For example, various level meters, etc.

Here, the measurement range depends on the static accuracy of the detector.

(Effects of the Invention) As described above, according to the liquid/powder measuring and mixing device of the present invention, by adopting a measuring device that is not affected by the measurement setting value, the amount of raw material in the supply container, the physical property value of the raw material, etc. Reduction in the number of weighing devices ■ Since it is possible to reduce the loss of raw materials, the following economic effects can be obtained.

■ Reducing initial costs by reducing the number of devices ■ Reducing maintenance man-hours by reducing the number of devices ■ Reducing failures by improving reliability by reducing the number of devices ■ Because of flow velocity control, the raw material is not affected by residual f (head difference) etc. Reducing running costs by reducing losses

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a metering and mixing device for various liquids and powders according to an embodiment of the present invention, FIG. 2 is a control block diagram explaining the device shown in FIG. 1, and FIG.・A configuration diagram of a powder measuring and mixing device, FIG. 4 is a configuration diagram showing a conventional device, and FIGS. 5 and 6 are measurement characteristic diagrams based on experimental results conducted based on the present invention. l, 2. ..., N: Tank (supply container), 11°12
, ..., IN: opening adjustment valve, 21, 22. .... 2N: Shutoff valve, 30: Storage pot (supply container), 31
: Sarze motor, 32 Niscrew feeder, 33: Shutter gate, 40, 50: Receiving container, 41: Connecting pipe,
42: Load cell, 43: Load cell amplifier, 44: Weighing control device f'! , 45: Sir IP Rhino (drive control section), 46: Switching device, 47: Bottom valve, 48:! 51 tank, 49.51: Stirrer. Agent: Patent attorney (8107) Kiyotaka Sasaki (and 3 others)
- Figure 3 Figure 4 Procedural amendment 1. ! Indication of Hfl 1985 Patent Application No. 106416@2, Title of invention Liquid/Powder Meter Hanging Mixer U 3, Relationship with the subsidy tenant: Name of patent applicant: (520) Tomi F Photo Film Co., Ltd. 4. Agent address: 3-chome Kasumigaseki, F-ku, Tokyo 100 [No. 12-5 Kasumigaseki Building 29th floor Kasumigaseki Building Naigobin Bureau Private Box No. 4
No. 9 No. 5, Number of inventions increased by amendment: 06, Subject of amendment: (1) "Detailed description of the invention" column of Akira mix (2) Drawing Figure 4

Claims (1)

[Scope of Claims] 1) A liquid/powder metering and mixing device that measures and mixes multiple types of liquids and powders using a closed-loop powder metering method that changes the flow rate, the device comprising at least two supply units. a container, a receiving container that receives and pollinates the liquid and powder filled in the supply container, a flow rate controller attached to each of the supply containers to control the flow rate, and a flow rate controller attached to the receiving container to receive and pollinate the liquid and powder. a detector that cumulatively weighs the body; a metering control device that calculates a flow velocity control amount based on the actual measurement value measured by the detector and a measurement setting value; and a metering control device that switches the flow velocity control amount to the flow velocity controller. A liquid/powder measuring and mixing device characterized by comprising a switching device for outputting and a stirrer for stirring measured powder fluid. 2) The metering control device calculates the flow rate control amount by fuzzy control, learning control, or optimal control from the deviation between the arbitrarily set metering setting value and the actual metering value and the deviation time change amount. Liquids listed in scope 1.
Powder measuring and mixing device. 3) A flow rate controller for controlling the powder flow rate is provided by a screw feeder, an opening damper, or a shutter gate, and a flow rate controller for controlling the liquid flow rate is provided by an opening adjustment valve. A liquid/powder measuring and mixing device according to claim 1. 4) Claim 1, characterized in that it combines an addition measurement method in which a detector is installed in the receiving container to measure the amount, and a subtraction measurement method in which a detector is installed in the supply container to measure the outflow amount. The liquid/powder measuring and mixing device described in 2.