KR950013032B1 - Method for controlling water-content in sizing machine - Google Patents

Abstract

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Description

Moisture control method of protector

1 is a schematic diagram showing the configuration of a control device with an inclined path in a protector.

2 is a specific embodiment of a control device corresponding to the first embodiment.

3 is a specific implementation of a control device corresponding to the second embodiment.

* Explanation of symbols for main parts of the drawings

1: Sizing machine 2: Slope

3: control device 4: guide roll

5: drive roll 6: sizing box

7: sizing roll 8: press roll

9: dryer 10: cylinder roll

11: guide roll 12: take up roll

13: winding tooth beam 14: liquid

15: motor 16, 17, 18, 19: transmission

20: heat 21: heat source

22: regulator 23: speed control

24: calorie control 25: moisture content detector

26: temperature detector 27: setter

28: Comparator 29: Converter

30: setter 31: addition point

32: comparison point 33: drive amplifier

34: Teco Generator 35: Comparator

36: setter 37: setter of the reduction amount

38: setting amount of increase 39: setting amount

40: addition point 41: limiter

42: upper limit calorie Qlim setter 43: comparison point

44: drive amplifier 45: driver

46: rotary actuator 47: speed adjuster

48: relay 49: contact

50: integrator 51: comparison point

52: comparator 53: relay

54: contact 55: addition point

60: contact point

The present invention relates to a method for controlling the water content of the inclined after drying as a protector of the inclined.

Japanese Patent Application Laid-Open No. 62-187292, Japanese Patent Application Laid-Open No. 53-7596, and Japanese Patent Application Laid-Open No. 2-154055 detect the moisture content of the slope in order to keep the dryness of the slope after grass feeding constant, and the drying temperature. One of the traveling speeds of the slopes is changed to adjust the moisture content to the target value.

In either of these control methods, only one of the drying temperature and the traveling speed is the control target, and the other is kept at a constant value in the actual control process.

When the control system changes the temperature by making the running speed constant, the response of the temperature control is slow, so that the quality of the slope after being fed in the response delay section is degraded.

For this reason, in general, the speed is changed while the temperature is kept constant. The state of the optimum temperature setting, that is, the temperature at which the speed and average value can be obtained as high as possible as the running speed of the inclination becomes within the upper limit value. Difficult to set up.

If the set temperature is too high, the average speed is high, and the productivity is good.

However, during the control, the running speed of the slope may exceed the upper limit value, and the moisture content control becomes impossible, and the quality of the slope decreases due to insufficient penetration of the pool liquid.

On the contrary, if the set temperature is too low, the moisture content control is normal, but since the average speed is excessively low, the productivity is reduced.

On the other hand, in the above publication, Japanese Patent Laid-Open No. 2-154055 suggests changing the running speed of a slope and the temperature of a drying process, but there is no specific disclosure.

Therefore, an object of the present invention is to control the moisture content to the target value under high productivity without degrading the quality of the warp, that is, disabling the control of the moisture content.

Under the above object, the present invention uses a speed controller that controls the running speed of the slope within the upper limit value of the running speed by setting the moisture content of the slope as a target value, and uses a heat quantity controller that controls the heat amount of the drying process to a predetermined value. When the speed reaches the upper limit value, by outputting a correction command in the direction of decreasing the calorie value by the calorie control unit, the moisture content approaches the target value while avoiding the running speed of the incline exceeding the upper limit value. When the running speed does not reach the upper limit while maintaining the quality of the subsequent inclination, the calorific control unit outputs a correction command in the direction of increasing the calorific value. Is adjusted in the direction of raising.

Here, among the two control targets, that is, the traveling speed and the calorie value, the traveling speed is a direct operation amount with respect to the moisture content of the control target in preference to the heat quantity, so that the moisture content control can be performed under high productivity without degrading the quality of the slope. Done.

FIG. 1 shows the outline of the protector 1 together with the path of the inclination 2, and shows the connection relationship between these and the control apparatus 3. As shown in FIG.

The plurality of inclinations 2 are sheet-shaped and wound around the guide rolls 4 and the driver rolls 5 and then pass between the sizing rolls 7 and the press rolls 8 at the position of the sizing box 6. After contacting the pool liquid 14 accommodated in the sizing box 6, it enters the inside of the dryer 9 and is wound in a zigzag shape around the outer periphery of the plurality of cylinder rolls 10, where it is dried and the guide roll ( 11), the take-up roll 12 is wound around the outer circumference of the gouge beam 13.

Here, the driver roll 5, one sizing roll 7, all the cylinder roll 10, the take-up roll 12 and the winding beam 13 is a common motor 15 and a plurality of transmissions 16, It is driven by (17), (18), and (19), respectively.

In addition, drying heat 20, for example, steam is supplied from the heat source 21 and supplied to the drying cylinder roll 10 via the regulator 22.

And the said control apparatus 3 is comprised by the speed control part 23 and the heat quantity control part 24. As shown in FIG.

The speed control part 23 sets the moisture content A of the inclination 2 as a target value for control, receives the data of the moisture content A from the moisture content detector 25, and inclines the control object in the grass feeding step and the drying step. In order to adjust the traveling speed V of (2), the rotation speed of the motor 15 is controlled.

Moreover, the heat quantity control part 24 inputs the command of the speed control part 23, and the data of the temperature T from the temperature detector 26, and controls the opening degree of the regulator 22 of the heat source 21, and is dried. The heat quantity (temperature) of the bottom is controlled.

In addition, when the dryer 9 is of the type which dries the inclination 2 by blowing hot air, the heat quantity control part 24 changes the temperature of hot air or the flow volume of control as calorie control.

Example 1

2 shows a specific configuration of the speed control unit 23 and the calorific control unit 4.

The speed control unit 24 includes a setter 27, a comparator 28, a converter 29, a setter 30 of a basic speed Vo, a sum point 31, and a comparison point (a) of the target moisture content (Ao). 32, the drive amplifier 33, the teco generator 34, the comparator 35, and the setter 36 of the upper limit speed Vlim.

In addition, the calorific value control unit 24 includes the setters 37 and 38 of the target calorific value Qo, the addition point 40 and the limiter 41 upper limit calorie value of the decrease and increase amount? Q. Qlim), the setter 42, the comparison point 43, and the drive amplifier 44 are comprised.

Further, the setter 39 has a target heat quantity Qo as high as possible, taking into consideration the influence on the inclination 2 so that the control of the moisture content A is performed under the high running speed V of the inclination 2. It is set as).

During the feeding and drying operation of the protector 1, the moisture content A of the inclination 2 is detected by the moisture content detector 25 and becomes the input of the comparator 28.

Here, the comparator 28 compares the target moisture content Ao with the actually measured moisture content A, generates a signal of the moisture content deviation ΔA, and sends the signal to the converter 29 and the setter 37.

The converter 29 converts the moisture content deviation ΔA into a voltage corresponding to the speed deviation ΔV and sends it to the pressure point 31.

Therefore, the input of the drive amplifier 33 becomes the command voltage E of the sum of the fundamental speed Vo and the speed deviation (DELTA) V, and the rotation speed of the motor 15 is based on this command voltage E. FIG. By controlling, the running speed V of the inclination 2 is adjusted, and the water content A is rapidly approached to the target moisture content Ao by the long and short residence time of the inclination 2 in the drying step.

In addition, the rotational state of the motor 15 is detected as a voltage by the teco generator 34 and negatively fed back to the comparison point 32.

In this way, the speed control part 23 indirectly approaches the moisture content A to the target moisture content Ao by adjusting the running speed V of the inclination 2 using the moisture content A as a control target.

In addition, the comparator 35 compares the current running speed V with the upper limit speed Vlim to generate a signal of the speed margin Vlim-V, and the setters 37 and (in addition to the converter 29) ( 38) to the back.

On the other hand, the drive amplifier 44 inside the calorific control unit 24 controls the feedback of the temperature T by inputting the target calorific value Qo, thereby adjusting the opening degree of the regulator 22 to adjust the calorific value 20 of FIG. ) Is controlled, but the heat amount 20 is changed in accordance with the control state of the speed control unit 23.

When the running speed V reaches the upper limit speed Vlim in the control process, if the moisture content deviation ΔA is zero, there is no problem, but even if the running speed V reaches the upper limit speed Vlim, it is still overdried. When the water content deviation ΔA corresponding to the above water content occurs, the water content deviation ΔA is output over a long time.

Therefore, when the output time of the moisture content deviation (ΔA) corresponding to the over-drying condition continues for a long time or when the speed margin (Vlim-V) = 0 or the moisture content deviation (ΔA) output time is long, at the same time the speed margin When the degree (Vlim-V) = 0, the moisture content A cannot be adjusted by the speed control unit 23 alone, and the inclination 2 is in an overdrying state, so the setter 37 of the calorific control unit 24 is Outputs the reduction amount? Q as a negative sign to the addition point 40 for a reduction command, and outputs the heat quantity Q signal of the sum of the sum and the target heat quantity Qo to the driving amplifier 44. ) Input.

This decrease amount? Q is set in advance as an amount proportional to the moisture content deviation? A or as a predetermined amount.

Thus, when the moisture content control by the speed control part 23 becomes the limit, ie, when the said condition is satisfied, the heat quantity control part 24 reduces the heat quantity Q, and the running speed V of the inclination 2 is made. ) Is approaching the target moisture content (Ao) while limiting the within the range of the upper limit speed (Vlim).

And when the moisture content deviation (DELTA) A becomes zero or when the traveling speed V falls below the upper limit speed Vlim, the calorific value control part 24 stops decreasing the heat quantity Q. As shown in FIG.

As a result, the moisture content A is maintained at the target moisture content Ao under the high running speed V. FIG.

Therefore, the inclination 2 is such that its moisture content is controlled under high productivity without compromising quality.

Then, when the water content changes and the speed margin (Vlim-V)> 0 in the water content control process, the setter 38 increases the output of the increase amount ΔQ in order to increase the heat quantity Q. It is generated as a sign of (+) and outputs to the addition point 40, thereby changing in the direction of increasing the amount of heat 20.

Even if the running speed V is not changed by this calorific increase correction, the water content A is not far and is lower than the target water content Ao. Therefore, the speed control unit 23 increases the speed of the motor 15 to thereby increase the water content A. ) Is approached to the target moisture content (Ao) and corrected in the direction of increasing productivity.

This increase in heat quantity Q is performed until the speed margin Vlim-V = 0.

The increase amount DELTA Q is given here as an amount or a predetermined amount which is directly proportional to the speed margin Vlim-A.

In addition, in the process of increasing the quantity of heat Q, the limiter 41 limits the output within the range of the upper limit quantity of heat Qlim set in the setter 42, thereby preventing abnormal drying.

In addition, as described above, the positive increase operation of the heat quantity Q is performed from the speed margin Vlim-V> 0 to the speed margin Vlim-V = 0.

However, since the amount of heat Q is actively reduced when the speed margin Vlim-A becomes 0 on one side, the control of the amount of heat Q tends to be unstable.

Therefore, the allowable range k (k is an integer) is set in the speed margin Vlim-A, and when the speed margin exceeds (k), the heat quantity Q is actively increased to allow the allowable range k. When the following is reached, when the increase is stopped, calorie control is performed stably.

Example 2

3 shows an example in which the actuator 45 is driven by the driver 45 in accordance with the moisture content deviation ΔA to directly change the basic speed Vo of the speed setter 47, that is, the target value itself.

That is, the comparator 28 generates the output of the moisture content deviation ΔA in the same manner as in the above embodiment, but according to the positive (+) or negative (-) of the sign, the driver 45 has a rotary actuator ( The setting value of the speed setter 47 is radiused by setting the rotation direction of 46) and simultaneously adjusting the rotation amount according to the absolute value of the moisture content deviation ΔA.

Therefore, the drive amplifier 33 drives the motor 15 by inputting the basic speed Vo after a change.

When the basic speed Vo becomes equal to the upper limit speed Vlim, the relay 48 opens the contact 49 to control the correction in the subordinate direction and to open the contact 60. The correction in the direction of increasing the heat quantity Q is prevented.

On the other hand, the moisture content deviation ΔA is output from the addition point 55 to the integrator 50.

This integrator 50 has an integral time constant that is larger than the output time of the moisture content puncture A when the moisture content control is being performed by the speed control section 23.

For this reason, even if a water content puncture (DELTA) A normally generate | occur | produces, since the basic speed (Vo) changes and the deviation is eliminated immediately, the moisture content deviation (DELTA) A is not integrated in the integrator 50.

Therefore, when the basic speed Vo is in the range of the upper limit speed Vlim, the calorific value control unit 24 controls the calorific value Q to be equal to the target calorific value Qo.

If the basic velocity Vo reaches the upper limit velocity Vlim in the course of the moisture content control, and the moisture content deviation ΔA corresponding to the over-drying condition occurs thereon, the moisture content deviation ΔA is greater than the integral time constant. Long time output.

Therefore, this moisture content deviation (DELTA) A is integrated in the integrator 50, and is output to the comparison point 51 as a correction signal of a calorie reduction direction.

Therefore, the drive amplifier 44 controls the heat quantity Q in a decreasing direction by inputting the difference between the integral signal of the moisture content deviation ΔA and the target calorific value Qo, thereby setting the moisture content A to the target moisture content. Approach (Ao).

Thereby, the moisture content A of the basic speed Vo which is equal to the upper limit speed Vlim is controlled to this target moisture content Ao.

Later, when the moisture content (A) changes due to changes in the surrounding environment such as room temperature, temperature, or the state of the pool, and the basic extinction (Vo) falls below the upper limit speed (Vlim) during the moisture rate control process, the comparator 35 The contact 49 and the contact 60 are closed by deactivating the relay 48.

Since the heat amount Q at this time is in a state lower than the target heat amount Qo, the direct 54 is closed by the relay 53.

Therefore, when the basic speed Vo falls below the upper limit speed Vlim, the increase amount AQ from the setter 38 is output to the comparison point 51 through the integrator 50 to raise the temperature.

Since the moisture content A changes in this temperature rising process and becomes lower than the target moisture content Ao, the basic velocity Vo increases in response to this.

In addition, this temperature rise is followed by the contact 54 or the contact 60 when the heat quantity Q becomes equal to the target heat quantity Qo or when the basic speed vo becomes equal to the upper limit speed Vlim. ) Is opened to stop.

Therefore, even if the basic speed Vo falls below the upper limit speed VIim, an aggressive temperature rise is performed, and at the time when the temperature rise is stopped, the moisture content A is maintained at the target moisture content Ao under a higher basic speed Vo. It becomes.

In the present invention, it is possible to control the moisture content under high productivity without deteriorating the actual quality after pool feeding, and to increase the running speed of the incline by actively increasing the amount of heat when the inclined running speed is below the upper limit speed. By doing so, the productivity is further increased within the speed limit.

Claims (1)

The speed control part 23 which controls the traveling speed V of the inclination 2 in a grass feed process and a drying process by setting the inclination 2 as the target value of moisture content A within the upper limit of a traveling speed, and a drying process. And a calorific value control unit 24 for controlling the calorific value Q of the calorific value Q, wherein the calorific value control unit 24 is a direction in which the calorific value Q decreases when the traveling speed V of the inclination 2 reaches an upper limit value. Command to the regulator 22 of the heat source 21, and when the running speed V of the inclination 2 does not reach the upper limit, the command in the direction of increasing the heat quantity Q is supplied to the heat source 21. A moisture content control method for the protector, characterized in that output to the regulator (22).