KR20060048500A - Drying apparatus for sizing machine - Google Patents

Abstract

When it is necessary to reset the PID constants of the temperature controller due to a change in the surrounding environment or the like, the operator of the hot air drying apparatus can surely set the optimum PID constants.

The hot air drying apparatus has a temperature control function for controlling the heating amount of air by the air heater according to the PID calculation result based on the deviation between the drying chamber internal temperature and the set target temperature, and a predetermined heat quantity for each PID constant used for the PID calculation. And a temperature controller capable of selectively executing a tuning function determined on the basis of the execution result of the control, and a main controller instructing the operation of the blower, the air heater, and the temperature controller by input of a manual operation signal. The main controller outputs the execution command of the tuning function to the temperature controller when the blower is in operation when the tuning command signal is input as a manual operation signal, and outputs the execution command of the tuning function when the blower is in the inoperative state. To stop.

Description

Hot air drying device of inclined swelling machine {DRYING APPARATUS FOR SIZING MACHINE}

1 is a conceptual diagram showing an embodiment of a hot air drying apparatus according to the present invention.

FIG. 2 is a block diagram of the hot air drying device shown in FIG. 1. FIG.

FIG. 3 is a flowchart showing a flow of determination processing of the main controller shown in FIG. 2; FIG.

4 is an operation timing chart of the hot air drying apparatus shown in FIG. 1.

5 is a graph showing an example of a response waveform of drying room temperature before applying automatic tuning to the hot air drying apparatus shown in FIG. 1;

FIG. 6 is a graph showing an example of a response waveform of drying room temperature after applying automatic tuning to the hot air drying apparatus shown in FIG. 1. FIG.

FIG. 7 is a flowchart showing another flow of determination processing of the main controller shown in FIG. 2; FIG.

FIG. 8 is a flowchart showing another flow of determination processing of the main controller shown in FIG. 2; FIG.

<Description of Symbols for Main Parts of Drawings>

S1: Run signal S2: Heat signal

S3: Temperature control command signal S4: Stop signal

S5: Tuning operation signal S6: Alarm signal

S7: Tuning command signal T: Target temperature

To: Actual detection temperature 10: Hot air dryer

12 slope 14 dry chamber

16: temperature detector 18: air blowing path

20: blower 22: air heater

24, 26: opening 28: hot air intake

30: hot air exhaust port 32: exhaust fan

34: exhaust fan 36: exhaust duct

38: opening 40: control valve

42: radiator 46: blower motor

48: blowing fan 50: main controller

52: temperature controller 54: operation button

56: hit button 58: stop button

60: tuning operation button 62: drying control unit

64: winding control unit 66: setter

68: alarm lamp

The present invention relates to a hot air drying apparatus for drying by passing a wet slope.

As one of the hot air drying apparatus for drying a wet inclination, the thing of patent document 1 is known. The hot-air drying apparatus described in patent document 1 is a temperature detector which detects the internal temperature of a drying chamber and a drying chamber as a dry room temperature, the blower which blows air into the inside of a drying chamber, and the air blower for heating the air put into a drying chamber. An air heater disposed in the path, and a temperature controller for controlling the heating amount of the air by the air heater based on the deviation of the drying room temperature with respect to the preset target temperature.

In addition, the temperature inside the drying chamber is provided with a control valve in the air heater to detect the drying room temperature using a known electronic automatic control system, and the opening and closing time of the control valve in proportion to the deviation of the drying room temperature from the target temperature. The method of implementing by changing (DUTY ratio) is known (nonpatent literature 1).

In addition, in order to increase the degree of adjustment of the temperature inside the drying chamber, the hot-air drying apparatus used in the recent inclined arc blowing machine performs PID operation based on the deviation of the drying room temperature with respect to the target temperature and the preset PID constant, The temperature controller which adjusts the opening / closing time of a control valve based on the result of PID operation is used.

[Patent Document 1] Japanese Patent Application Laid-Open No. 9-209258, FIG. 8

[Non-Patent Document 1] 'Jong-hoe Hobu', 4th Edition, February 29, 55, Japan Textile Machinery Society, P247-251

The PID constants set by the temperature controller are prepared in advance by the manufacturer of the hot air drying apparatus and are databased. The operator suitable for the actual environmental conditions used is selected by the manufacturer's worker. The operator repeats the actual temperature control test to determine whether the PID constant is appropriate and sets the appropriate PID constant.

However, the temperature control in the drying chamber is influenced by the actual environment, in particular the ambient temperature and air pressure, in addition to the capacity and steam pressure of the steam boiler serving as the heat source.

However, due to changes in the ambient environment of the slope preparation plant (for example, seasonal changes in ambient temperature, changes in elevation following plant relocation), or renewal of equipment (changes in boiler capacity or capacity as a steam supply source), The PID constant set may be in an unsuitable state due to such a change.

If the hot air drying apparatus is operated without appropriately changing the PID constants, a delay in hunting and correction of the internal temperature of the drying chamber occurs, and as a result, the degree of temperature control is deteriorated, resulting in unevenness in the inclination dryness. As a result, these degrade the quality of the inclined beam. In order to solve such a problem, it is completed when an operator of a slope preparation plant performs an operation of setting an appropriate value to a PID constant, but in reality, an operator who works with a hot air dryer is based on the actual situation of the environment. It is difficult to judge the suitability of integers.

An object of the present invention is to enable an operator of a gradient preparation plant, which is a user, to reliably set an optimum PID constant when it is necessary to reset the PID constant of the temperature controller due to a change in the surrounding environment.

Any hot air drying apparatus according to the present invention is dried by passing a wet slope.

The first hot air drying apparatus includes a drying chamber for drying by passing a wet slope, a temperature detector for detecting an internal temperature of the drying chamber, a blower for sending air into the drying chamber, and the air fed into the drying chamber. An air heater arranged for heating, a temperature control function for controlling the heating amount of air by the air heater in accordance with a PID calculation result based on a deviation between an internal temperature of the drying chamber and a set target temperature, and used for the PID calculation The operation of the blower, the air heater and the temperature controller can be performed by inputting a temperature controller capable of selectively executing a tuning function for determining each PID constant based on the execution result of a predetermined calorie control and a manual operation signal. Includes commanded master controller. The main controller outputs an instruction for executing the tuning function to the temperature controller when the blower is in operation when inputting a tuning command signal as a manual operation signal, and when the blower is in an inactive state, Blocks the execution command output.

The second hot air drying apparatus includes a drying chamber for drying by passing a wet slope, a temperature detector for detecting an internal temperature of the drying chamber, a blower for sending air into the drying chamber, and the air fed into the drying chamber. An air heater arranged for heating, and a temperature control function for controlling the heating amount of air by the air heater in accordance with a result of a PID operation based on a deviation between an internal temperature of the drying chamber and a set target temperature. Operation of the blower, the air heater and the temperature controller by input of a manual operation signal and a temperature controller capable of selectively executing a tuning function for determining each PID constant to be used based on a result of a predetermined calorie control. Includes a master controller that commands. The main controller outputs an instruction for executing the tuning function to the temperature controller when the blower is in operation when inputting a tuning command signal as a manual operation signal, and when the blower is in an inoperative state, Output the signal.

The third hot air drying apparatus includes a drying chamber for drying by passing a wet slope, a temperature detector for detecting an internal temperature of the drying chamber, a blower for sending air into the drying chamber, and the air fed into the drying chamber. An air heater arranged for heating, a temperature control function for controlling the heating amount of air by the air heater in accordance with a PID calculation result based on a deviation between an internal temperature of the drying chamber and a set target temperature, and used for the PID calculation The operation of the blower, the air heater and the temperature controller can be performed by inputting a temperature controller capable of selectively executing a tuning function for determining each PID constant based on the execution result of a predetermined calorie control and a manual operation signal. Includes commanded master controller. When the master controller inputs a tuning command signal as a manual operation signal, the blower is put into an operating state, and then an instruction for executing the tuning function is output to the temperature controller.

Embodiment of the Invention

Referring to Fig. 1, a hot air drying apparatus 10 such as an inclined arc blowing unit is arranged in a sheet shape in a previous step (not shown), and a drying chamber in which hot air is blown through a plurality of wet slopes 12 having a grass attached thereto. It is passed through (14) and dried. Then, the inclination 12 is sent to a cylinder drying part (not shown) in a later process, and is further dried.

The hot-air drying apparatus 10 is supplied to the drying chamber 14, the blower 20 arrange | positioned at the air blowing path 18 which blows in the air inside the drying chamber 14, and the blower 20 substantially. It has an air heater 22 arranged to heat the air.

The drying chamber 14 is rectangular in cross section, and has a cylindrical shape in which openings 24 and 26 are provided on one side and the other side. The hot air suction port 28 and the hot air exhaust port 30 are provided in the vicinity of one end and the other end in the longitudinal direction of the drying chamber 14.

The temperature detector 16 is disposed inside the drying chamber 14 between the hot air intake 28 and the hot air exhaust 30. The temperature detector 16 is a well-known temperature sensor, such as a thermocouple, for example.

The air blowing path 18 is a path for sending air from the hot air exhaust port 30 to the hot air intake port 28. More specifically, the air blowing path 18 roughly includes the duct 18a connecting the hot air exhaust port 30 of the drying chamber 14 and the inlet of the air heater 22 and the air heater 22. It has a duct 18b which connects a part and the intake port of the blower 20, the duct 18c which connects with the blower outlet of the air heater 22, and the hot air inlet 28 of the drying chamber 14, The drying chamber 14 ), The air circulation path is heated through the air heater 22 and returned to the drying chamber 14 by the blower 20. An air heater 22 and a blower 20 are arranged in series in the air blowing path 18.

In the vicinity of the hot air exhaust port 30 for circulation of the hot air, a hot air exhaust port 31 for exhaust air is provided, and an exhaust duct 36 and an exhaust device 32 are disposed with respect to the hot air exhaust port 31. The exhaust machine 32 has an exhaust fan 34 and an exhaust motor 35 for rotating the exhaust fan 34. The air sucked in from the hot air exhaust port 31 is discharged from the opening 38 of the exhaust fan 34 to the outside of the hot air drying apparatus 10 via the exhaust duct 36.

The air heater 22 includes a heat source (not shown) such as a steam boiler for generating steam, a control valve 40 for controlling supply steam from the heat source, and a radiator 42 for radiating heat of the supplied steam. These are connected to the airtight through the pipe. However, the air heater 22 may include a heater that generates heat in accordance with a temperature control command signal as an operation amount signal of a temperature controller described later, or may include a gas heater that generates heat in accordance with a combustion amount of fuel gas. good.

The control valve 40 for adjusting the steam supply amount is, for example, an on-off valve. The on-off valve is fully open or fully closed by an ON or OFF signal output from the temperature controller 52 described later. However, the adjustment valve 40 may be a tightening valve, and the tightening amount may be controlled based on the tightening amount signal output from the temperature controller 52.

The blower 20 puts the air heated by passing the air heater 22 from the hot air exhaust port 30 by making the inlet state into a negative pressure state by the operation, and from the said blower outlet, the said heating The compressed air to the hot air intake (28).

The blower 20 has a blower motor 46 and a blower fan 48 which rotates by rotation of the output shaft of the blower motor 46. The blower motor 46 is controlled by the main controller 50 mentioned later.

The air heated by the air heater 22 mainly flows inside the drying chamber 14 from the hot air inlet 28 to the hot air exhaust port 30 through the air blower 20 by the suction force of the air blower 20.

The some inclination 12 has passed through the inside of the drying chamber 14 toward the other opening 26 from one opening 24 of the drying chamber 14 in the wet state. The plurality of inclinations 12 located inside the drying chamber 14 are dried by heated air flowing inside the drying chamber 14. It is preferable that the direction of movement of the plurality of inclinations 12 in the interior of the drying chamber 14 is opposite to the direction of movement of the heated air flowing through the interior of the drying chamber 14.

2 shows a control block diagram of the hot air drying apparatus 10. The hot air drying apparatus 10 includes a main controller 50 and a temperature controller 52.

The main controller 50 receives signals from the operation button 54, the heat button 56, the stop button 58, and the tuning operation button 60, which the operator operates. The operation button 54, the heat button 56, the stop button 58, and the tuning operation button 60 function as a driving manipulator.

The main controller 50 is comprised by well-known controllers, such as a programmable controller, for example. The main controller 50 has a drying control unit 62, a control unit of an inclined arc blowing unit (not shown), for example, a winding control unit 64, and a tension control unit (not shown) for controlling the tension of the inclination. The main controller 50 can output the temperature control command signal S3 and the autotuning command signal S7 to the temperature controller 52 by pressing each button as follows.

When the operator presses the operation button 54 or the heat button 56, the operation signal S1 or the heat signal S2 is input to the main controller 50. As a result, the main controller 50 sets the blower 20 to an operating state by the operation of the corresponding current generator outputting a command signal. In addition, the main controller 50 outputs the temperature control command signal S3 to the temperature controller 52. In the temperature controller 52, the details will be described later, but temperature control is started to control the amount of heat to be heated in the circulating air so that the drying chamber 14 becomes a predetermined target temperature. In this way, the operation of the hot air drying apparatus 10 is started.

The heat button 56 is a button which is operated in advance when the internal temperature of the drying chamber is lowered prior to the start of operation by pressing the operation button 54, and more specifically, the temperature of the drying chamber 14 is previously set. It is operated to prevent dry spots immediately after the start of operation by raising the temperature to a desired target temperature.

Therefore, when the operation button 54 is pressed, the main controller 50 outputs the operation signal S1 so that both the winding control unit 64 and the pull control unit (not shown) such as the tension control unit (not shown) operate. Is placed on. As a result, although not shown below about the specific structure of an inclined arc swell, the sheet-like wet inclination loosened from the delivery beam and submerged in the pool liquid was narrowed through the drying chamber 14 and further the cylinder drying part which is the next process, Further, the inclination 12 travels while maintaining a predetermined inclination tension, and is wound around the inclination beam.

In addition, the exhaust machine 32 is installed for the purpose of discharging moisture in the drying chamber and increasing the drying effect by discharging a part of the circulating air during the operation of the inclined arc swelling. On the basis of the algorithm that is not explained, it is properly operated according to the operation status of the slope call book.

When the cause of the stop stand occurs during the operation of the inclined arc swelling, or when the stop signal S4 is input to the main controller 50 by the operator pressing the stop button 58, the main controller 50 is inclined. The swelling (not shown) is stopped immediately, and the blower 20 and the exhauster 32 are inoperative. In addition, the main controller 50 outputs the off temperature control command signal S3 to the temperature controller 52, and immediately stops the execution of the temperature control.

By the way, the temperature control of the temperature controller 52 will be described later in detail. However, in the case of supplying and installing the inclined arc scavenger, the control gain of the temperature controller (manufacturer) of the inclined arc scavenger is controlled (more specifically). PID constant) is determined to be an appropriate value. On the other hand, in an inclined preparation factory having an inclined arc swelling, there are many cases where an installation of a gradient boiler, such as a steam boiler, which becomes a heat source, a change in four seasons, or a relocation of inclined swelling to a separate place having different elevations. have. Due to such changes in the surrounding environment, the control gain for the temperature controller may change. In other words, the control gain determined earlier becomes a value unsuitable for changes in the surrounding environment, resulting in a risk of impairing the functionality of the temperature control.

For this reason, in the temperature controller 52 of the hot-air drying apparatus 10 which is this apparatus, an operator operates a tuning operation button, and performs predetermined | prescribed heat quantity control instead of execution of a normal temperature control function. It is configured to selectively execute a tuning function for automatically determining the PID constant gain.

More specifically, in response to such a change in the surrounding environment, the operator of the inclination preparation plant presses the tuning operation button 60 so that the main controller 50 determines the operation state of the blower 20. The tuning command S7 is output to the temperature controller 52.

It is necessary to perform automatic tuning under the condition that the blower 20 is in an operating state, and must be performed while the heat button 56 is pressed or during operation of the blower.

Therefore, the operator presses the heat button 56 before starting the operation of the blower, and the main controller 50 which has received the heat signal S2 operates the hot air drying apparatus 10. The heat button 56 is operated while the blowing machine is stopped.

In advance, the air heater 22 circulates the drying chamber 14 through the air blowing path 18 and heats the heated air to maintain a predetermined temperature. Prevent poor drying in (12).

The setter 66 is comprised with the touch panel etc. which have the function of the input device and the indicator with respect to the main controller 50 and the temperature controller 52. FIG. The setter 66, the main controller 50, and the temperature controller 52 are connected to each other so that information can be transmitted and received.

The setter 66 stores a program prepared in advance by the manufacturer of the hot air drying apparatus 10, and the setter 66 displays the screen of an indicator and an input device not shown by an operation performed by an operator. Is switched to output the set value input by the touch operation performed by the operator to the master controller 50. In addition, the setting device 66 reads the information (for example, stop table information and winding length control information) of the main controller 50 and displays it on the screen of the display device (not shown) of the setting device 66. .

The operator can switch the screen of the setter 66 to another screen to display information by inputting a dialogue method with the operator, and input the target temperature T inside the drying chamber 14. The setter 66 outputs the input target temperature T to the temperature controller 52.

Preferably, the setter 66 may display the temperature inside the drying chamber 14 detected by the temperature detector 16 as a drying room temperature. The setter 66 may record the detected dry room temperature in accordance with the time of operation by the operator, and output the recorded dry room temperature on the screen of the display according to the time as the horizontal axis as the time axis.

The temperature controller 52 calculates the deviation between the drying room temperature To and the target temperature T, performs a PID operation based on the calculated deviation, and performs the air heater 22 based on the result of the PID operation. A calorific value control signal for controlling the heating amount of air is output. The PID operation outputs the sum of the manipulated values of the proportional element (P operation), the integral element (I operation), and the derivative element (D operation) as the operation amount.

The proportional constant (P constant) on which the proportional element (P operation) is based is determined in the form of proportional band. Here, the proportional band refers to an area for outputting an operation amount proportional to the deviation, and is a width α centered on the set value of the target temperature T.

When the measured temperature To in the drying chamber is equal to or less than the time point of the proportional band (that is, To <T-α / 2), the output of the manipulated variable is fixed at 100%, and conversely, above the end point of the proportional band (ie, T + α / In the case of 2 <To), the output of the manipulated variable is fixed at 0%.

The manipulated variable is 100% to 0% depending on the deviation from the target temperature T between the measured temperature To and the end point of the proportional band (ie, T-α / 2 ≤ T + α / 2). It is output in the range up to. The smaller the width of the proportional band, the larger the manipulated value for the deviation amount.

The integral constant (I constant) on which the integral element (I operation) is based is determined in the form of the integral time. Here, the integral time is a time until the operation amount of the integration reaches an operation amount equal to the operation amount by proportional operation when the deviation of the step shape is input.

The shorter the integration time, the larger the amount of change in the manipulated variable with time elapsed with respect to the deviation amount.

The derivative constant (D constant) on which the differential element (D operation) is based is determined in the form of differential time. Here, the derivative time is the time until the operation amount of the derivative reaches an operation amount equal to the operation amount by the proportional operation when inputting a ramp shape deviation in which the deviation increases at a constant rate with time.

The longer the derivative time is, the larger the manipulated variable with respect to the change in the deviation amount is.

In this way, the PID operator corresponds to the sum of the amount of operation in each of the proportional element (P operation), the integral element (I operation), and the differential element (D operation), and the open / close valve as a control signal of the heating amount of air. The manipulated-variable signal to 40 can be output.

For example, in the case where the on / off valve 40 connected through the current generator is a so-called on / off controlled on / off valve, the ratio between the predetermined unit period and the period during which the on / off valve 40 is in an open state The opening / closing command signal which becomes the opening / closing ratio (duty ratio) corresponding to the operation amount by the sum total of each said element is output as a control signal of the heating amount of air.

By operating the heat button 56 by the operator, the temperature controller 52 drives the opening / closing valve 40 to open and close in accordance with the calculated operation amount so that the temperature inside the drying chamber 14 becomes the target temperature T. Then, the air flowing inside the air heater 22 is heated.

Further, preferably, the main controller 50 has a temperature within the drying chamber 14 within a few percent of the target temperature T (for example, when the target temperature T is 80 ° C, at 73 ° C). The operation signal S1 from the operation button 54 is invalidated until reaching the range up to 78 ° C. When the temperature inside the drying chamber 14 reaches a few percent of the target temperature T, the main controller 50 operates the winding control unit 64 or the like in accordance with the driving signal S1 from the driving button 54. By outputting this, the hot air drying apparatus 10 is operated to dry the wet inclination 12 supplied.

Thereby, the quality defect of the inclined beam by the drying defect which performs drying of the inclination 12 by the temperature inside the drying chamber 14 low with respect to target temperature T can also be prevented.

By the way, as mentioned above, PID constant which is a control gain is automatically determined again with respect to the temperature controller 52 of the hot air drying apparatus 10 by the change of the surrounding environment with respect to the gradient arc swelling in a slope preparation factory. When a tuning operation to be performed is necessary, the operator may put the blower 20 into an operating state, that is, either the operation button 54 or the heat button 56 prior to the operation of the tuning operation button 60. It is necessary to circulate the air heated by the air heater 22 in the drying chamber 14 by operating the blower 20 to operate. On the other hand, the specific processing supported by the main controller 50 so that the blower 20 finally performs the tuning operation in the operating state, which is the subject of the present invention, will be described in detail below.

3 is a flowchart showing the flow of the judgment processing of the main controller 50.

When the operator operates the tuning operation button 60, the tuning operation signal S5 is input to the main controller 50 (ST101).

Therefore, the main controller 50 determines whether or not the blower 20 is operating on the basis of the internal information such as the current operation mode for the inclined call blowing unit (ST102). When the main controller 50 determines that the blower 20 is operating, the main controller 50 outputs the tuning command signal S7 to the temperature controller 52 (ST104). As a result, the operator can cause the temperature controller 52 to execute an automatic tuning operation.

When the main controller 50 determines that the blower 20 is not operating, the main controller 50 outputs an alarm signal S6, thereby causing the alarm lamp 68 to flash continuously, thereby alerting the worker (ST103). As a result, the operator can recognize that the automatic tuning is not performed.

In addition, when it is determined that the blower 20 is not operating, the main controller 50 receives the tuning command signal S7 to the temperature controller 52 despite the input of the tuning operation signal S5. The output may be blocked.

During the automatic tuning operation, when the processing algorithm of the setter 66 or the master controller 50 is constructed to display information indicating that the operation is in the tuning operation on the display of the setter 66, the master controller ( 50 may be configured not to switch the screen of the output device of the setter 66 despite the input of the tuning operation signal S5. As a result, the operator can recognize that automatic tuning is not performed.

When the operator recognizes that the automatic tuning is not executed, the operator operates the operation button, the heat button, or the like again to perform an appropriate operation procedure called a tuning operation. As a result, determination of an inappropriate PID constant due to an incorrect order is reliably prevented, and finally, the optimum PID constant is set by the setter 66.

However, when the display of the output device of the setter 66 shows that automatic tuning is in operation, the alarm by the alarm lamp 68 may be omitted.

Thus, for example, it is assumed that the conditions of the surrounding environment are greatly changed by transferring the oblique arcs to another factory having different elevations.

4 shows an operation timing chart from when the heat button is operated until auto tuning is completed.

In the temperature controller 52, PID constants suitable for the previous environmental conditions are set and stored. For this reason, when the operation signal from the heat button is turned ON, the main controller 50 immediately turns on the blower blower as the blower 20, while the temperature controller 52 immediately turns on the temperature control mode. As a result of switching from the mode 'to the' temperature control ON mode 'and outputting a manipulated-variable signal not shown to the air heater 22, the internal temperature of the drying chamber detected through the temperature sensor 16 is set to a target value from room temperature. It rises rapidly toward the temperature T. However, since the PID constant has been previously inadequate, hunting occurs above and below the detection temperature To with the target temperature T interposed therebetween.

When the room temperature of the drying chamber is raised to some extent, when the operator operates the tuning operation button to generate the tuning operation signal, the temperature controller 52 switches the control mode to the 'auto tuning mode'.

Operation in Automatic Tuning Mode In the so-called automatic tuning operation, for example, the actual room temperature To starts from a state slightly below the target temperature T.

More specifically, the on-off valve 40 is opened all the way until the actual internal temperature To of the drying chamber reaches the target temperature T, and then the on-off valve is completely opened until the target temperature T is lower. The temperature in the drying chamber is hunted by executing the temperature control to be closed, and the measured temperature after the fluctuation width W1 of the temperature in the hunting and the on-off valve 40 is completely closed by the temperature control. The time until the To reaches the highest value Td1 and the measured temperature To fall below the target temperature T until the measured temperature To changes from the state where the open / close valve 40 is fully opened. Each time T1 is measured, and a PID constant is calculated and determined automatically based on each data obtained by repeating this hunting operation about two times.

When this automatic tuning operation is finished, it is switched to the &quot; temperature control ON mode &quot; again, and temperature control can be immediately executed based on such optimally determined PID constants.

In addition, the target temperature T of the hot air drying apparatus 10 is set in consideration of the thread type and the actual speed. Specifically, the target temperature T is set in a range of 50 kPa to 180 kPa.

As one of the automatic tuning operations, there is a known limit cycle method. In the limit cycle method, when the drying room temperature is close to the set value, the control valve (steam opening / closing valve) is operated to turn on and off a predetermined number of times according to a predetermined program (automatic tuning mode). Hunting of dry room temperature occurs. The limit cycle method uses the P constant (proportional) and the I constant (integral) from the amplitude (WI, W2) and the hunting periods (T1, T2, Td1, Td2) of the change in dry room temperature when hunting is occurring. , A technique for calculating a D constant (differential).

5 shows an example of a response waveform of a dry room temperature before executing autotuning. 6 shows an example of the response waveform of the dry room temperature after the automatic tuning is performed again.

5 and 6 are both examples before the start of temperature control. When comparing the change in the drying chamber internal temperature, that is, the response waveform, from the start of control when the target temperature (T) is 80 ° C, the automatic tuning is again performed, and the time is shorter when the target temperature (T) is reached. In addition, it shows a smooth temperature change. By the execution of the automatic tuning, it can be seen that the response of the internal temperature of the drying chamber is clearly improved.

FIG. 7 is a flowchart showing a flow of a modification of the determination processing of the master controller 50 shown in FIG. 3. This embodiment also corresponds to the second hot air drying apparatus described above.

In addition, the main controller 50 in this embodiment outputs the tuning command S5 regardless of the operation status of the blower 20, and when the blower is in an inoperative state, the main controller 50 It differs from the above-mentioned embodiment in that an alarm signal S6 is output.

Specifically, when the operator operates the tuning operation button 60, the tuning operation signal S5 is input to the main controller 50 (ST201).

Therefore, the main controller 50 outputs the tuning command signal S7 to the temperature controller 52 (ST202).

The main controller 50 determines whether or not the blower 20 is operating on the basis of the internal information such as the operation mode of the current oblique call-up book (ST203). When the main controller 50 determines that the blower 20 is not in operation, the main controller 50 generates an alarm signal S6 while continuously flashing the alarm lamp 68 while executing the tuning operation to prompt the operator to respond ( ST204).

In this way, the operator can recognize that the autotuning has been performed in a non-operating state by the alarm. More specifically, the operator can recognize that autotuning is performed under inadequate circumstances to determine the PID constant.

Therefore, the operator operates the heat button, and in a state where the blower is normally operated, performs an appropriate operation procedure called tuning operation again. As a result, the optimum PID constant is finally set in the temperature controller 52.

With respect to the above-described embodiment, all of them aim to make the operator recognize that there is an error in the operation sequence in the operator's tuning operation. On the other hand, by inputting the tuning operation signal, it is also conceivable to actively arrange the situation required for tuning and execute the tuning operation.

Therefore, FIG. 8 shows the flowchart which shows the flow of the modification with respect to the determination process of the main controller 50 shown in FIG.

Specifically, when the operator operates the tuning operation button 60, the tuning operation signal S5 is input to the main controller 50 (ST301).

Therefore, the main controller 50 determines whether or not the blower is operating on the basis of the internal information such as the operation mode of the current oblique call book (ST302).

When the main controller 50 determines that the blower 20 is not in operation, the main controller 50 first outputs an operation signal of the blower to operate the blower 20, and simultaneously turns the control mode of the temperature controller 52 to 'temperature control ON'. The mode is switched to perform temperature control for the target temperature T (ST303).

On the other hand, the main controller 50 determines whether the elapsed time after the tuning operation button is input has reached a predetermined time (ST304), and when the predetermined time has been reached, the tuning command signal S7 is transmitted to the temperature controller ( 52) (ST305).

For this reason, the temperature controller 52 switches the control mode to the "auto tuning mode", performs predetermined calorific control as described above, calculates the PID constant based on the data concerning the detected temperature at that time, Can be determined automatically.

In addition, for a predetermined time for delay processing in ST304, the internal temperature of the drying chamber is set in advance so that the tuning operation can be started at a temperature suitable for the automatic tuning operation. However, without performing such a delay process, it is also possible to immediately proceed to step ST305 to start the tuning operation and to reach a temperature suitable for tuning during the automatic tuning operation.

On the other hand, in the process step ST302, when the main controller 50 determines that the blower is in operation, it immediately proceeds to process step ST305 and outputs the tuning command signal S7 to the temperature controller 52. In addition, the above process is implemented by the algorithm (software) put into the main controller 50. As shown in FIG.

Thus, when the operator performs the tuning operation, the main controller 50 causes the blower to be in operation when the blower is not in operation, outputs a tuning command signal, and executes the automatic tuning operation of the PID constants. Therefore, the operator does not have to be aware of the operation procedure determined as in the prior art, and can also set an accurate PID constant.

This invention is not limited to the said Example, A various change is possible in the range of the said summary.

According to the first hot air drying apparatus according to the present invention, even if a worker who does not have experience in determining so-called PID constants, such as an operator of a user (inclination preparation factory), has a temperature controller by a tuning function. Not only can an appropriate PID constant be automatically set, but also the operator cannot notice, and the blower can be prevented from calculating and setting an incorrect PID constant by executing a tuning operation without the blower operating. As a result, poor temperature adjustment due to an incorrect PID constant can be prevented, and deterioration of the quality of the inclined beam can be prevented.

According to the second hot air drying apparatus according to the present invention, as with the first hot air drying apparatus, not only can an appropriate PID constant be set, but also the operator recognizes that the blower is operated in a non-operating state by the generation of an alarm signal. Therefore, the operator can reliably set the correct PID constants by tuning the blower to the operating state again.

Therefore, since the execution of the actual tuning function by the tuning operation performed by the operator is finally executed when the blower is in the operating state, the operator can surely set the correct PID constant. Therefore, the internal temperature of a drying chamber can be kept always stable.

According to the third hot air drying apparatus according to the present invention, at the time of tuning operation, even if the blower is in an inoperative state due to an error in the operator's operation procedure or the like, the blower is first operated by the input of the tuning operation signal. Since the heated air was circulated to perform tuning thereafter, accurate PID constants can be set reliably.

Claims (3)

A drying chamber which is dried by passing a wet slope; A temperature detector for detecting an internal temperature of the drying chamber; A blower for blowing air into the drying chamber, An air heater arranged to heat the air sent to the drying chamber, A temperature control function for controlling the heating amount of air by the air heater according to the PID calculation result based on the deviation between the internal temperature of the drying chamber and the set target temperature, and the respective PID constants used for the PID calculation for A temperature controller capable of selectively executing a tuning function that is determined based on the execution result; A main controller instructing operation of the blower, the air heater and the temperature controller by input of a manual operation signal, The main controller outputs an instruction for executing the tuning function to the temperature controller when the blower is in operation when inputting a tuning command signal as a manual operation signal, and when the blower is in an inactive state, Hot air drying device of inclined arc swelling device to block output of execution command of tuning function. A drying chamber which is dried by passing a wet slope; A temperature detector for detecting an internal temperature of the drying chamber; A blower for sending air into the drying chamber; An air heater arranged to heat the air sent to the drying chamber, Temperature control function for controlling the heating amount of air by the air heater according to the result of PID operation based on the deviation between the internal temperature of the drying chamber and the set target temperature, and the predetermined calorific value control for each PID constant used for the PID operation. A temperature controller capable of selectively executing a tuning function for determining based on the result of A main controller instructing operation of the blower, the air heater and the temperature controller by input of a manual operation signal, The main controller outputs an instruction for executing the tuning function to the temperature controller when the blower is in operation when inputting a tuning command signal as a manual operation signal, and when the blower is in an inoperative state, Hot air drying device of the inclined arc swell for outputting a signal. A drying chamber which is dried by passing a wet slope; A temperature detector for detecting an internal temperature of the drying chamber; A blower for sending air into the drying chamber; An air heater arranged to heat the air sent to the drying chamber, A temperature control function for controlling the heating amount of air by the air heater according to the PID operation result based on the deviation between the internal temperature of the drying chamber and the set target temperature, and each PID constant used for the PID operation is determined by A temperature controller capable of selectively executing a tuning function that is determined based on the execution result; A main controller instructing operation of the blower, the air heater and the temperature controller by input of a manual operation signal, The main controller, when inputting a tuning command signal as a manual operation signal, sets the blower to an operating state, and then outputs a command to execute the tuning function to the temperature controller.

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