JPS58212769A - Method for controlling concentration in preparation apparatus for laver - Google Patents

Abstract

PURPOSE:To carry out the concentration control with a high accuracy, by using signals of the difference between the set values of the concentration and the measured values of the present concentration and further the signals of the difference between the measured values of the above-mentioned set values and the measured values of the concentration obtained in the preceding step. CONSTITUTION:A preparation apparatus for laver is constituted of a laver supply mechanism, water supply mechanism, preparation tank, a concentration sensing mechanism of a preparation stock in the preparation tank prepared from the laver and water, a hydration mechanism and a dehydration mechanism for controlling the concentration and a controller (13A) for adjusting the concentration. Signals of difference between the set values of the concentration and the measured values of the present concentration and the signals of difference between the above-mentioned set values and the measured values obtained in the preceding step are used to respond to the change in the slope of the concentration change and control the concentration to change the driving time of the hydration mechanism. As a result, the variation in the performance of the apparatus can be well absorbed to make the concentration control possible with a high accuracy.

Description

[Detailed description of the invention] The present invention relates to a method for controlling remaining seats in a seaweed blending device,
For example, the present invention relates to a concentration control method in a seaweed blending device having an A degree control mechanism.

First, a concentration control method in a seaweed blending device according to the prior art will be explained.

Here, FIG. 1 is a partially cross-sectional schematic diagram of a conventional seaweed blending device.

In the figure, 1 is a hopper, 3 is a dividing wheel, 4 is a seaweed supply motor, and these form the seaweed supply mechanism related to the seaweed raw algae 2. 5 is a water tank, 6 is a water supply mechanism, and 7 is: Stirring mechanism 8. Preparation tank equipped with water level sensor 9, 10 = V
1 is a detection fitting mechanism, 11 is a water addition mechanism, 12 is a water reduction 'f: structure, and 1
3 is a controller.

That is, the seaweed raw algae 2 placed in the hopper 1 is sent to the lower part via the dividing wheel 3 as the seaweed supply motor 4 rotates, and is fed into the mixing tank 7 together with the water from the water supply system 6. It has become.

This introduced mixed solution of seaweed 2 and water (hereinafter referred to as a mixed solution) is stirred by a stirring mechanism 8.

At the same time, the concentration is detected by the concentration detection mechanism 10.

When the water level of the blended liquid in the blending tank 7 reaches H level, the controller 1 uses the set value of the water level sensor 9.
3, the supply of seaweed algae 2 and water is stopped,
Moreover, when the level drops to L level, the input starts again.

Furthermore, the gripping tank 7 is equipped with a water adding mechanism 11 and a water reducing mechanism 12 for controlling the concentration, and is configured to be controlled by a controller 13 so as to bring the concentration to a set value. be.

That is, the concentration setting value set in the controller 13 and the concentration detected by the concentration detection mechanism 10 are set in the controller 13.
The device is configured to perform control in the following manner depending on the measured concentration value inputted to the device.

Then, as shown in the figure, it is continuously taken out from the mixing tank 7 to the outside (paper machine).

Next, a conventional density control method in the above configuration will be described in detail with reference to FIGS. 2 to 4.

Here, FIG. 2 is a curve diagram of the relationship between the concentration change gradient and time, and FIG. 3 is a curve diagram of the relationship between the set value and the measured value after control.

FIG. 4 is a relationship curve diagram between the drive time of the water addition/water reduction mechanism 1 and the r&[step difference, which will be described later, according to an embodiment of the present invention. This is how it was done.

For convenience of the order of explanation, first, FIG. 4, which is a relationship curve diagram between the drive time of the water addition/reduction mechanism and the partial step difference, will be explained.

In Fig. 4, the horizontal axis shows the deviation (step difference) between the set value and the measured value, that is, the difference in concentration between the set value and the concentration in the mixing tank 7, expressed as the number of steps. The + side of is the dark side.

Also, on the vertical axis, □ water addition mechanism 11. The driving time of the water reducing mechanism 12 (proportional to the amount of water), that is, the driving time of the water reducing mechanism 12 is taken as T1.

In addition to showing the set degree range, the water reduction mechanism drive range is shown on the left, and the water addition mechanism drive range is shown on the right.

Here, for example, the broken lines A', C
', or B' and D', which are control sensibilities for driving a water addition and water reduction mechanism by a single or only one rod.

That is, in the conventional accuracy control method, for example, the slope of the driving time is determined by a single driving time, as shown by the broken lines A', C', or B', D' in FIG. Water-added wax structure 11 to prevent deviation, which is the difference from the measured value.
Alternatively, the total time for driving the water reduction mechanism 12 may be changed.

If the one step is off by more than a predetermined step, the drive is performed continuously (7 on the right side of the figure indicates continuous drive), and within that time, the intermittent drive time is varied. It is.

The total time for this intermittent and driving operation varies depending on each device, but it is generally 7 to 10 seconds.
It's in the corner.

In the case shown, if the total time is 7 seconds, then
, when there is a one step deviation in C/, that is, ±1
The driving time of water addition and water reduction mechanism 11 and 12 is 1 second when
The OFF time is 6 seconds, and the driving time is longer and the OFF time is 6 seconds.
If the FF song becomes shorter and there is a deviation of ±7 steps or more, the above-mentioned continuous drive will occur.

Although it is a bit different, Figure 2 is related to the change in the ridge in the mixing tank 7, and the slope θ of the change in the slope in the tank is the variation in the supply amount of the nori device related to the tentative nori supply structure. This shows that there are various slopes over time due to variations in the quality of the seaweed.

Note that in FIG. 2, the shaded area indicates a range that is considered to be the same as the density setting value.

In other words, in the supply of water and seaweed algae 2 to the seaweed consolidation device, there are many variations in the supply of seaweed algae 2 in particular, and in particular, the overall amount of seaweed algae 2 in the hopper 1 changes. Then, the weight of seaweed raw algae per frame of the dividing wheel 30 changes significantly, and this tendency is common to all current seaweed blending devices.)The time axis related to time T is set horizontally as shown in the figure. If the concentration axis related to the concentration in the mixing tank 7 is taken vertically and the concentration change gradient is expressed as shown in the figure, when the concentration change is gradual, as shown in A, CXB, and D of the slopes θ11 and θ2 in the figure. There are cases where it is sudden.

In addition, Fig. 3 shows how the concentration of the blended liquid changes with respect to the set concentration as a result of control. G indicates when the driving time of the acceleration/deceleration mechanism is too short. Looking at it from a different perspective, E indicates that the amount of water added or reduced is too large, F is appropriate, and G is too small.

That is, in the control method using a single driving time gradient as described above, the gradient θ of the concentration change in ρ shown in FIG.
Regarding θl, for example, the setting value and control @j in Fig.
As shown by F in the later measurement value relationship curve, it is possible to appropriately control the change in θ2, but the control time is too long and the result is as shown in G in Fig. In a device as shown in FIG. 1 in which the liquid output is continuously taken out, the error becomes so large that it cannot be used.

On the other hand, if we were to make it possible to respond to the change in θ2 mentioned above, the gold layer would exceed the change in θ1 by 7 Uts as shown in E in Figure 3, resulting in a large error. , which leads to a situation similar to the one described above.

In the above-mentioned conventional concentration control method, although the gradient change of the prepared liquid has various gradients, the control side has to adjust the gradient θl' or θ2, for example.
Since the water reduction mechanism has only a single drive slope and a water reduction mechanism drive slope, the control accuracy has not been improved, resulting in the above-mentioned situation.

It is an object of the present invention to provide a concentration control method for a seaweed blending device that eliminates the drawbacks of the prior art, has good control performance, and has very high control quality.

The configuration of the present invention includes a seaweed supply mechanism, a water supply mechanism, a mixing tank, a concentration detection mechanism for a mixture of seaweed and water in the mixing tank, a water addition mechanism for controlling the degree of sludge, and a water reduction dependent system. A seaweed blending device is configured by a controller and a concentration adjustment controller, and a signal indicating the difference between a concentration setting value and a current concentration measurement value, and a signal from the previous measurement between the setting value and the current concentration measurement value are configured. A concentration control method in a seaweed blending device, in which the drive time of the water addition mechanism and water reduction mechanism is controlled to be changed in response to a change in the gradient of the concentration change using a signal representing the difference between the two values. be.

It should be noted that the present invention differs from the conventional method in which the water addition/reduction mechanism is driven once based only on the difference between the set value of the blended liquid level and the current measured value; The difference between the measured value and the set value is memorized, and the gradient θ of the concentration change is detected from this and the difference between the current value and the set value, and water is added or reduced accordingly. By changing the driving gradient θ of the mechanism 1, it is possible to significantly improve the control accuracy.The accuracy is expressed in terms of the weight of one bundle of 100 sheets of nori, and the conventional method has a variation of approximately Regarding togr, according to the method of the present invention,
The weight was ±3gr.

Furthermore, the present invention is basically different.

It is the same as controlling the pump failure of a water reduction system.

Next, the embodiments according to the present invention will be described in FIGS. 1 to 4.
This will be explained with reference to FIGS. 5 and 6.

Here, FIG. 5 shows (
FIG. 6, a block diagram of the configuration of the hardness adjustment controller, is a flowchart according to one embodiment thereof.

In the figure, 13A is a concentration adjustment controller (hereinafter referred to as a controller), and the seaweed blending device used for this purpose has the configuration of the controller 13 shown in FIG. controller 13A.

That is, the controller 13A includes the lift detection circuit 14,
It consists of a first memory circuit 15 of F/F1, a second memory circuit 16 of F/F2, a decoder 17, and a timer circuit 18.

The concentration detection circuit 14 detects the difference between the concentration setting value of the blended liquid and the current concentration measurement value (the step difference mentioned earlier), that is, the concentration difference, and the first storage circuit 15 is used to record and hide this density difference.

Further, the second memory circuit 16 is inputted with the output of the first memory circuit 15, and is configured to store the concentration difference (step difference) one time before the current value of the first memory circuit 15. It is.

The decoder 17 is inputted with the step difference of the first memory circuit 15 and the step difference of the second memory circuit 16, and these two signals determine whether you want to make it lighter or darker as described later. , outputs a HIGH or LOW signal to the +/- terminals shown in the figure, and also outputs a To-T7 signal to the timer circuit 18.
Pump drive output signal, ie, water addition and water reduction mechanism.Thus, with the above configuration, the concentration control method according to this embodiment can be performed as shown in FIG. 4, A', 13'.

As C/, , D/, the gradient θ! ', θ2', the gradient θ' of the drive time is changed, and this will be described in detail below, together with the operation of the decoder 17 described above.

Now, the first signal related to the mixed liquid in the gripping tank 7 is transmitted to the second signal.
As shown in A in the figure, the gradient θ of the concentration change is 1 of the gradient θ■
When the change occurs, the controller 13A changes the drive time gradient 01' shown at A' of the fourth tooth at about 1.
Assume that when the water reduction mechanisms 11 and 12 are driven, matching occurs as shown in F in FIG.

Assume that as time passes, the gradient θ of the change in degrees becomes steeper, as shown in θ2 shown in FIG. 2B. At this time, in order to know that the slope has changed from θl to 02, if there is a step difference signal of the 54th second storage circuit 16 (based on the current measurement data one time before), we can use this and By combining step difference No. 16 and 7 of the first storage circuit 15, that is, by taking the difference, for example, it is possible to know the change in the gradient θ of the concentration change. This case corresponds to adding water, that is, adding water.

In this way, the decoder 17 detects the change to the gradient θ2, and calculates the addition/reduction hypothetical structure I, which has a driving time gradient θ2' as shown in B' in FIG. In this case, the water adding mechanism 11 is driven.

The same goes for the case from CI to D' in FIG. 4, and in this case it is time to make it darker.

In other words, even for the same step difference, if the change is sudden, the amount of water is increased, and if the change is gradual, the amount of water is decreased. This is to perform appropriate control as shown in F.

A flowchart related to the concentration control method described above is shown below.
As shown in FIG. 6, the question is whether it is the same as the set value.

In addition, in FIG. 4, the gradient θ1' is shown as the gradient of the drive time.
+ θ2', only the dipolar bend is shown, but
This is just an example; in reality, there will be a variety of two or more buildings, and in accordance with the requirements, a configuration and method that can be quickly adapted to suit the effectiveness and cost will be selected and adopted.

As described above, according to this embodiment, even if the gradient θ of the concentration change changes, the gradient θ of the drive time of the egg and water reduction mechanism
' changes accordingly, it is possible to better absorb variations in the performance of the equipment used for the implementation, and a high degree of crowning can be expected.

Furthermore, in the above embodiment, the driving time of the shallow grooves is changed in response to the change in the slope of the change. The supply motor can be controlled by changing the speed of the variable speed motor in accordance with the change in the gradient.
Further, it is possible to perform fine density decoration in a short time.

Taking all of the above into consideration, according to the present invention, variations in the input amount of materials and water in the seaweed blending device are not treated as mere deviations from set values, but as deviations and gradients of change. Therefore, even with a seaweed blending device with poor performance, a sufficiently high-precision concentration control method can be used, and this invention can be said to have excellent practical effects.

[Brief explanation of the drawing]

Figure #31 is a partial schematic configuration diagram of a conventional seaweed blending device, Figure 2 is a curve diagram of the relationship between the concentration change gradient and time, and Figure 3 is a diagram showing the set value and the relationship after opening side 1. The measured value relationship curve diagram, FIG. 4, shows water addition according to an embodiment of the concentration control method in the nori blending device according to the present invention. FIG. 5 is a diagram showing the relationship between the water reduction mechanism drive time and the concentration step difference; FIG.
FIG. 6 is a flowchart according to one embodiment. DESCRIPTION OF SYMBOLS 1...Hopper, 3...Dividing vehicle, 4...Nori supply motor, 5...Water tank, 6...Water supply mechanism, 7...
-Blending tank, 8... Stirring mechanism, 9... Water level sensor, 10... Concentration detection mechanism, 11... Water addition mechanism, 12
. . . Water reduction mechanism, ], 3A . . . Concentration adjustment controller, 14 . . . Concentration detection circuit, 15 . . . First storage circuit,
16... Second memory circuit, 17... Decoder, 18...
...Timer circuit, θ1, θ2...gradient of concentration change, θ1', θ2'...addition, water reduction mechanism, gradient of drive time. '1-・1 ((1 other person)

Claims (1)

[Scope of Claims] 1. A seaweed supply mechanism, a water supply mechanism, a mixing tank, a concentration detection mechanism for a mixture of seaweed and water in the mixing tank, and a water addition mechanism for controlling the concentration. A seaweed blending device is configured by a water reduction temporary structure and a concentration adjustment controller, and a signal indicating the difference between the concentration setting value and the current concentration measurement value, and a signal indicating the difference between the setting value and the current concentration measurement value are generated. The seaweed is characterized by controlling the driving time of the water adding mechanism and the water reducing mechanism to be changed in response to a change in the gradient of the concentration change using a signal representing the difference between the measured value and the measured value. Concentration control method in compounding equipment. 2. In the product described in claim 1, the seaweed supply mechanism is equipped with a variable speed motor, and the rotation speed of the variable speed motor is changed in accordance with the change in the gradient of the concentration change. A concentration control method in a seaweed blending device.