JPS59114418A - Automatic injection measuring apparatus - Google Patents

Abstract

PURPOSE:To inject raw liquid into a separate container efficiently at a required accuracy by automatically using discharge nozzles of a large and small diameter provided on row liquid tanks according to the required quantity of injection and allowable error in quantity of injection. CONSTITUTION:Raw liquid tanks 1 separately storing raw liquids A, B, C... are each equipped with a liquid feed tube 4 for delivery of raw liquid at the bottom thereof and the pressure in the tanks is linked to an air header 5 to be adjusted with a pressure adjustor 7. The liquid feed tube 4 of each raw liquid tank 1 is provided with two discharge valve 8-1 and 8-2 and the tip of each thereof is provided with discharge nozzles 9-1 and 9-2 different in the diameter. A controller controls the adjustor 7 and the opening or closing of electromagnetic valves 10-1 and 10-2 to obtain a specified injection level of the raw liquid 1 based on setting conditions, operational conditions and a signals inputted from detectors whereby a lift and a conveying device are regulated with an electromagnetic valve 14 when the injection and blending of various raw liquids is completed.

Description

[Detailed Description of the Invention] The technical field of the invention relates to a device for preparing viscous liquids such as paints (hereinafter referred to as stock solution), and more specifically, a device for automatically injecting stock solution stored in a tank into another container according to an arbitrary set prescription. It relates to a measuring device.

Purpose The present invention aims to automate the preparation work where the amount and mixing precision required for each stock solution vary over a wide range, such as in the preparation of paints. The object of the present invention is to provide an automatic injection/measuring device capable of efficiently injecting stock solutions of primary color paints and the like into separate containers with the required precision.

composition Hereinafter, the present invention will be explained in detail according to examples.

Fig. 1 shows an automatic blending device equipped with a plurality of uninvented devices. -1 is a sealed stock solution tank containing a stirrer 3 driven by an air motor 2, in which stock solutions A, B, C,
. . . are stored respectively, and there is a liquid sending pipe 4 at the bottom for carrying out the stock solution.
The tank internal pressure is regulated by a pressure regulator 7 connected to an air header 5 and controlled by a control device 6. Two discharge valves 8- are installed in the liquid feed pipe 4 of each stock solution tank 1.
1. 8-2, and a discharge nozzle 9-1, 9-2 formed of a thin tube with a uniform diameter is provided at the tip of each discharge valve. One discharge nozzle 9-1 has a large diameter;
The other discharge nozzle has a smaller diameter. 10-1.10-2
are respectively discharge valves 8-1. 8-2, which is a solenoid valve whose opening and closing are controlled by the control device 6. When this solenoid valve 10-1.10-2 opens, air pressure from the ladder 5 causes the discharge valve 8-1.8- to open. 2 opens, solenoid valve 10-1
．． 10-2 is 1 installed in one stock solution tank 1.
Although only the discharge valves corresponding to the pair of discharge valves 8-1 and 8-2 are shown, electromagnetic valves are similarly provided for the other discharge valves.

The stock solution in each stock solution tank 1 is transferred to the liquid sending pipe 4 by the pressurizing force of an inert gas such as air or nitrogen gas from the air header 51. Discharge valve 8-1 or 8-2 and discharge nozzle 9-1 or 9-2
The liquid is injected into the receiver 11 through the process. At that time, each discharge nozzle 9
The pressure applied to each stock solution tank is adjusted by the pressure regulator 7 so that the discharge speed of the stock solution discharged from -1.9-2 becomes a predetermined value regardless of the viscosity of the stock solution. 12 is a pressure gauge that detects the pressurizing force of the stock solution tank l and transmits the signal to the control device 6.

Reference numeral 13 denotes an electronic balance that detects the weight of the stock solution injected into the receiver 11, and detects the weight when the discharge valve is opened and the stock solution is being injected, that is, the dynamic weight, and the predetermined time after the discharge valve is closed. The weight after the lapse of time, that is, the static weight is detected and a signal thereof is sent to the control device 6.

15 is a lifting device for the receiver 11, and the receiver 11 is the lifting device M1.
5 and an electronic balance 13 from the transport device ζ (not shown).
and transported to another predetermined location. 16 is a thermometer that detects the temperature of the stock solution and transmits the signal to the control device 6.

The control device 6 is composed of a microcomputer and an input/output interface, and is configured to control the amount of stock solution stored in each tank based on the setting conditions and operating conditions entered in advance using a tape or key, and the signals input from each of the above-mentioned detectors. A pressure regulator 7 and a solenoid valve 10-1 are used so that a predetermined injection amount is obtained by sequentially applying the stock solution at a predetermined injection pressure according to a predetermined preparation order.
．． 10-2 is controlled to open and close, and when the completion of injection of each stock solution, that is, completion of preparation, is detected, the solenoid valve 14 is controlled to operate the lifting device and the conveying device.

An embodiment of the present invention will be explained in more detail in FIG.

20 is a viscosity/specific gravity correction circuit which uses the temperature detected by the temperature detector 16 as an input signal and corrects the viscosity and specific gravity of the stock solution using a viscosity-temperature table and a specific gravity-temperature table.

21 is a discharge pressure calculation circuit, which contains the viscosity corrected by the viscosity/specific gravity correction circuit 20, the discharge speed, the discharge pressure correction constant, and the nozzle condition C diameter.

The discharge pressure is calculated by inputting the set value of the length), and the pressure regulator 7 is controlled via the comparison control circuit 22 so that the discharge speed of the stock solution from the first and second discharge nozzles becomes a predetermined value. .

The comparison control circuit 22 follows the signal from the comparison circuit 23,
A discharge pressure signal calculated by the discharge pressure calculation circuit 21 or a set microinjection discharge pressure signal is input, and the pressure regulator 7 is controlled so that the signal of the pressure detector 12 matches the discharge pressure. be. These viscosity/specific gravity correction circuit 20° discharge pressure calculation circuit 21 and comparison control circuit 22 constitute a discharge pressure control means.

24 is a discharge control value calculation circuit which inputs the discharge control value constant, the nozzle diameter, and the specific gravity of the stock solution corrected by the viscosity/specific gravity correction circuit 20, and calculates the first and second discharge nozzles under a predetermined discharge speed. The discharge control value is calculated.

25 is a calculation circuit for the remaining amount to be poured, and the weight detector C (electronic balance) 1
Using the dynamic or static injection amount detected by step 3 as an input signal, the dynamic or static injection remaining amount between this injection amount and the target injection amount of the stock solution is calculated.

The comparison circuit 23 compares the target injection amount of the stock solution or the dynamic or static injection remaining amount from the injection remaining amount calculation circuit 25 and the discharge control value from the discharge control value calculation circuit 24, or compares the discharge control value from the discharge control value calculation circuit 24 with the allowable injection error amount of the stock solution. The static remaining injection amount from the remaining injection amount calculation circuit 25 is compared, and based on the comparison result, the opening/closing of the first discharge valve 8-1 and the second discharge valve 8-2 is controlled via the discharge valve opening/closing control circuit 26. Control.

The target injection amount of the stock solution is determined by the second input from the discharge control value calculation circuit 24.
When the discharge control value of the discharge nozzle is below or the static injection remaining amount from the remaining injection amount calculation circuit 25 is larger than the allowable injection error amount of the stock solution and below the discharge control value of the second discharge nozzle, the comparison is performed. A signal is sent from the circuit 23 to the comparison control circuit 22 to control the pressure regulator 7 so that the discharge pressure becomes the microinjection discharge pressure. In this case, the second discharge valve opening/closing time calculation circuit 27 inputs signals from the remaining injection amount calculation circuit 25 - the discharge valve opening/closing control circuit 26 and the timer 28 under this micro-injection discharge pressure, and Measure the minimum unit discharge amount and discharge time of the stock solution discharged from the second discharge nozzle under the injection discharge pressure, and send a signal to control the opening and closing time of the second discharge valve based on the measurement results. The signal is sent to the control circuit 26.

Next, the operation of setting the discharge speed of the stock solution to a predetermined value will be explained.

In this apparatus, it is preferable for the discharge speed of the stock solution to be as fast as possible to the extent that the discharged stock solution does not scatter outside the receiver 11 in terms of mixing efficiency.

In this apparatus, if the Reynolds number Re is 2300 or less, the discharge velocity of the stock solution becomes a laminar flow and the Hagen-Boiseuille law can be applied, so it can be determined by the following equation.

However, ■: Discharge speed (ff/5eC), P: Discharge pressure (g
r/image), μ; Stock solution viscosity (gr-sec/α), l
;Length of the discharge nozzle CCm) -di Diameter of the discharge nozzle ((7)) In other words, conduct a discharge experiment with a low viscosity liquid using an arbitrary discharge nozzle, and find the highest discharge pressure to the extent that the stock solution does not scatter. It is determined experimentally and the discharge speed ■0 is calculated from equation (1).

The discharge speed is set to the predetermined value, and the discharge pressure is controlled to the predetermined value according to the actual discharge nozzle and stock solution used.

This operation will be explained in detail according to the flowchart in FIG.

When the operation starts, a command signal is issued to inject the stock solution A in a predetermined stock solution tank 1 (step s1) = the control snow equipment 6 reads the temperature detection value ti from the temperature detector 16, and injects the stock solution that has already been set. A&r-'iJ) Based on the viscosity-temperature table, the viscosity μi corresponding to the temperature [i is calculated (steps s2 and s3). Next, the nozzle conditions C (diameter di, length/i) of the discharge nozzle 9-1 or 9-2 to be used, the predetermined value vO of the discharge speed, and the discharge pressure correction constant Pk are read (steps s4, s5. -56), calculate the discharge pressure P1 according to equation (2) [Step S7
).

This discharge pressure P1 is output to the pressure regulator 7, and the gas is sent from the air header 51 to the stock solution tank 1, and the pressure detector 1
Read the pressure detection value Pi from 2, P'i = pl
The pressure regulator 7 is controlled so that (step 88
．． S9,510,5ll).

As a result of the above, the stock solution A is discharged from the stock solution tank 1 at a discharge speed of the predetermined value vO. This operation is performed in the same way for any stock solution tank l.

Next, the stock solution injection method' will be explained.

The purpose of this device is to automate blending operations where the blending ratio varies over an extremely wide range (1:2000 or more), such as in paint blending. By using different discharge nozzles accordingly, we aim to improve blending efficiency and precision.

This device basically detects the weight of the undiluted solution discharged from the container 11 and stops dispensing the undiluted solution when the detected weight reaches a predetermined amount.However, due to the following error factors, Accurate sampling of the stock solution does not necessarily result in residual amount error (QE).
l) This error is due to the error caused by the raw liquid between the tip of the discharge nozzle 9-1 or 9-2 and the liquid level of the receiver 11.QEt-ρ・-d2・S... (3)
It is indicated by.

However, S: distance from the nozzle tip to the receiver liquid level (Gj) ρ
; Specific gravity of the stock solution (gr/α8) (2) Error due to the response of the weight detector, etc. (QE,...) This error is due to the response of the balance, sampling and discharge valve, etc., and the delay time due to these errors. When [e] is shown, QE2=ρ・−d2・■・[e...(4).

(3) Error due to dynamic load (QE8) This error is due to the dynamic load applied to the balance as the stock solution is continuously discharged, and is expressed as follows.

However, g: gravitational acceleration Catt/sec) t: falling time of the stock solution from the nozzle tip to the receiver liquid level (sec) Now, the total value of these error factors QEo' (hereinafter referred to as discharge control value) is calculated by the following formula. I can do it.

QEO=QE1+QE2 QE8 g If S, V, te, and Ht are given as constants, then ρ.

A discharge control value corresponding to 4 can be obtained. However, V is the aforementioned predetermined ejection speed ■0. That is, QEo”Kρd2
(7) However; Discharge control value constant The present invention basically employs the injection method as shown in FIG. 4 based on this discharge control value.

That is, first, the injection time is shortened by injecting from the first discharge nozzle with a large diameter (OA in Fig. 4), and the weight detected by the balance changes from the target injection amount to the discharge control value of the first discharge nozzle. When the value obtained by subtracting the
Move to the injection from the discharge nozzle (B in Figure 4) to improve the blending accuracy.Furthermore, when the weight detected by the balance reaches the value obtained by subtracting the discharge control value of the second discharge nozzle from the target injection amount, the process will be described later. Inject according to the microinjection method (C in FIG. 4). This injection operation will be explained in detail according to the flowchart in FIG.

When the operation starts, an injection command signal for the stock solution A in a predetermined stock solution tank 1 is output (step 512), and the control device 6 reads the target injection amount Q and the allowable injection error amount QE (step S1: l. Next, the temperature Read the detected temperature [i] from the detector 16, and calculate the specific gravity Pi corresponding to the temperature [i] from the specific gravity-temperature table of stock solution A that has already been set (
Step S14, 515). Next, read the nozzle conditions (aperture di 1 and discharge control value constant K) of the first and second discharge nozzles and set the discharge control value QEO' of the first and second discharge nozzles.
Calculate Q'EO (steps 516, 517, 518
).

Compare the target injection amount with the ejection control value QEo of the first ejection nozzle (step S19). If Q>QEo, the first ejection valve is opened and ejection is started, and the injection amount Qni is detected by the balance 13. and read sequentially (step 5)
20,521), QDi is Q-QE.

When the first discharge valve is reached, the first discharge valve is closed and the discharge is interrupted (step S22, 523). Predetermined time to after closing the first discharge valve
The injection amount QS i detected by the balance 13 after the elapsed time is read (step S24, 525). Compare Q-Qsi and allowable injection error amount QE, step s26) -
If Q-Qsi≦QE, the injection of stock solution A is completed.

If Q≦QEo in step 519, the target injection amount Q is further compared with the ejection control value Q'Eo of the second ejection nozzle. ＞Qm
-o, further compare Q-Qs i and 91EO (step 828) -Q-QSi>Q'EO, the second discharge valve is opened and discharge is started (resumed) (
step 529).

The injection amount QD i detected by the balance 13 is read sequentially,
When QDi reaches Q-Q'Eo, the second discharge valve is closed and discharge is interrupted (step 530.S31°532).
. Balance 1 when a predetermined time (0) has passed after the second discharge valve is closed
C step 533 to read the detected injection amount QSi according to 3.
, 5341 , Compare Q-QSi and QE, step s35) , If Q-Qsi≦QE, complete the injection of stock solution A.

If Q-QSi≦Q in step I8 and if Q-Qsi>QE in step S35, a microinjection command signal is output (step 536).

Next, the microinjection method will be explained.

This injection method is used when the target injection amount or allowable injection error is small, and basically controls the opening and closing of the discharge valve based on the relationship between the heavy discharge equipment and the discharge time.

That is, as shown in FIG. 6, first, one drop of the stock solution is dropped and its weight and ejection time are measured [a in FIG. 6]. From this, the ejection amount per unit time is calculated, and based on this, the time required to eject the target injection amount is determined, and ejection is performed for that time (b in FIG. 6). If the injection amount is still not within the allowable injection error after this operation, repeat the operation of dropping one drop at a time (c, d, e in Figure 6).
.

This injection operation will be explained in detail according to the flowchart of FIG.

When the microinjection command signal is output (step 536),
The control device 6 reads the microinjection discharge pressure ΔP and the detected pressure Pi from the pressure detector 12, and controls the pressure regulator 7 so that ΔP=Pi.C step S37. S38
,839. S40,541). After reading the injection amount Qsi detected by the balance 13, the second discharge valve is opened for a predetermined time TO, and after the elapse of a predetermined time 0, the injection amount Q'Si detected by the balance 13 is read (step 842.S43.S4
4. Steps 543 to 548 are repeated until QSi>QSi.

If Q-Q'Si≦QE, injection of stock solution A is completed (
step 549).

If Q-Q+si>QE, the discharge time T1 is calculated from the discharge amount W per unit time (step S50゜55
1). α in the equation of step 551 is a margin rate that prevents the injection amount from exceeding the target injection amount, and is a constant of 1 or less. The second discharge valve is opened for T1 time and after a predetermined time period has elapsed, the injection amount Q'Si detected by the balance 13 is read (steps S52, S53, S54, 556). Q
Compare Q'si and QE (Step 557), Q-
If Q'Si≦QE, injection of stock solution A is completed. Q-
If Q'Si>QE, open the second discharge valve for 10 hours and repeat this operation until Q-Q+Si≦QE.Step S58°S59, 860, 561, 562.
563), when QQ+si≦QE, the injection of stock solution A is completed.

The above operation explanation is about discharging the stock solution A from one specific stock solution tank, but if the same operation is performed for two or more stock solution tanks storing different stock solutions or stock solutions, two or more stock solutions will be discharged at a predetermined weight ratio. Needless to say, it is possible to prepare more than one type of stock solution.

Effect As described above, the present invention introduces the concept of discharge control value to automatically use the large-diameter and small-diameter discharge nozzles provided in the stock solution tank according to the required injection amount and allowable injection error amount. Therefore, it is possible to shorten the injection time of the stock solution, and as mentioned above, by setting up a micro-volume dispensing method that controls the opening and closing time of the discharge valve, the micro-dispensing method can be adjusted according to the required injection volume and the allowable injection error amount. Since the switching is automatic, it is possible to deal with cases where the required injection amount is extremely small or the required injection precision is extremely high.

Since the present invention has the above features,
If a plurality of stock solution tanks or the like are provided as necessary, the device becomes suitable as an automatic compounding device for paints and the like that have a wide variety of compounding recipes, and the rationalization of compounding work can be significantly promoted.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of one embodiment, and FIG. - Chart, Figure 4 is a diagram showing the injection method in the present invention, Figure 5
The figure is a flowchart showing the injection operation of the above embodiment.
The figure shows a micro-injection method according to the present invention, and FIG. 7 is a flowchart showing the micro-injection operation in the above embodiment. 1... Stock solution tank, 8-1.8-2...
・Discharge valve. 9-1.9-2...Discharge nozzle-11...
... Receiver, 7... Pressure regulator, 13...
・Weight detector, 16...Temperature detector, 20...
...Viscosity/specific gravity correction circuit, 21...Discharge pressure calculation circuit, 22...Comparison control circuit. 23... Comparison circuit, 24... Discharge control value calculation circuit, 25... Remaining injection amount calculation circuit, 26
...Discharge valve opening/closing control circuit, 27...Second discharge valve opening/closing time calculation circuit, 28...Timer. Patent applicant: Kurashiki Boseki Co., Ltd. Representative: Patent attorney: Aohaku, Ao, and 3 others Figure 3 Figure 4 Figure 6 □ Kuchijode Ginkan (1)

Claims (1)

[Claims] A stock solution tank containing stock solution. No. 1 installed in the liquid feeding route branched from the stock solution tank.
and a second discharge valve. a large-diameter first discharge nozzle and a small-diameter second discharge nozzle connected to the first and second discharge valves, respectively; A receiver that stores the stock solution for injection, and a pressure regulator that detects and adjusts the feeding pressure of the stock solution in the stock solution tank. A weight detector that detects the weight of the stock solution to be injected and a temperature detector that detects the temperature of the stock solution. Correcting the viscosity of the stock solution using the temperature detected by the temperature detector as an input signal, and outputting a signal to control the pressure regulator so that the discharge speed of the stock solution from the first and second discharge nozzles reaches a predetermined value. and a discharge pressure control means. The temperature detected by the temperature detector is used as an input signal to correct the specific gravity of the stock solution, and the first
and a discharge control value calculating means for calculating a discharge control value of the second discharge nozzle. Dynamic or static remaining injection amount calculating means for calculating the difference between the dynamic or static injection amount detected by the weight detector as an input signal and the target injection amount of the stock solution. The target injection amount of the stock solution or the dynamic or static injection remaining amount is compared with the discharge control value, and the allowable injection error amount of the stock solution is compared with the static injection remaining amount, and based on the comparison results, the first and the first injection amount are compared. 2. A discharge valve control means that outputs a signal for controlling opening and closing of the discharge valve. When the target injection amount of the stock solution is less than or equal to the ejection control value of the second ejection nozzle, or when the static injection remaining amount is larger than the allowable injection error amount of the stock solution and less than or equal to the ejection control value of the second ejection nozzle. outputting a signal for controlling the pressure regulator so that the discharge pressure becomes a predetermined pressure using a signal output from the second discharge nozzle as an input signal; an automatic injection metering device characterized by comprising: minute amount discharge means for measuring the discharge amount and discharge time and outputting a signal for controlling the opening/closing time of the second discharge valve based on the measurement results.