KR101060933B1 - Solenoid Valve Control Method Using Solenoid Valve Control System of Impact Airflow Filter Bag Dust Collector - Google Patents

Abstract

The present invention relates to a solenoid valve control method using a solenoid valve control system of a filter bag dust collector of an impact airflow type and a solenoid valve control system using a solenoid valve control system of a filter bag dust collector of an impact airflow type The present invention relates to a fuzzy control algorithm. More specifically, the solenoid valve control system of the filter bag dust collector of the impact air flow type, the pressure difference detection unit for measuring the pressure difference of the filter, converts the measured analog signal into a digital signal and outputs the pressure difference digital signal; A fuzzy unit including a fuzzy control algorithm and outputting fuzzy control algorithm data; A control unit for outputting a control signal by receiving the pressure difference digital signal output from the pressure difference detection unit and calculating an error amount and a pressure difference change amount using fuzzy control algorithm data transmitted from the fuzzy unit. It is a solenoid valve control system of the filter bag dust collector of the impact air type, characterized in that to control the solenoid valve from.

Impact air, filter cloth, pressure differential detector, fuzzy control algorithm, controller, on / off time

Description

Control method of solenoid valve using solenoid valve control system of filter bag dust collector of impact air type {Control Method of Solenoid Valve for Dust Collection}

The present invention relates to a solenoid valve control method using a solenoid valve control system of a filter bag dust collector of an impact airflow type and a solenoid valve control system using a solenoid valve control system of a filter bag dust collector of an impact airflow type It is about a control algorithm implementation method. More specifically, the pressure difference between the front and the rear of the filter is measured using the purge control method of the solenoid valve of the filter bag dust collector, and the error value and the pressure change amount, which are input signals, are calculated using the fuzzy control algorithm, and the solenoid A control system and control method capable of automatically controlling a solenoid valve by outputting control signals for on time and off time for opening / closing operation of the valve.

As the society is advanced, the importance of environmental problems is getting more and more important. Atmospheric environmental problems due to industrial development are getting serious. In particular, dust emitted from each industry is a major factor in accelerating air pollution. In order to effectively control the dust emission, not only the characteristics of the generated gas or dust should be identified and installed and operated properly, but also the performance and process of the existing dust collection facility should be improved after understanding the dust collecting mechanism and performance. .

Dust collecting technologies currently widely used for preventing air pollution by pollutants such as dust include washing dust collecting technology, electric dust collecting technology or filter cloth dust collecting technology.

Among them, dust collected in the cleaning dust collecting technology is a sludge containing a large amount of water, and there is a risk of causing secondary pollution when treating the wastewater. In addition, the electric dust collecting technology moves and collects the particles such as dust and mist contained in the exhaust gas to the surface of the dust collecting plate by the electric system through the corona discharge. Is effective in the collection of particles smaller than 10 ~ 20㎛ range, but it is somewhat difficult to filter a large amount of dust, there is a disadvantage that the easy exhaustion method and expensive installation cost.

Finally, the filter cloth dust collecting technology is the dust collecting technology that can exhibit the best dust collecting function compared with other dust collecting technologies. The most efficient impact air dust exhausting method among the dust trapping methods of the filter cloth dust collecting technique is to blow the dust layer attached to the outer surface of the filter cloth instantaneously by blowing high pressure air from the upper part of the filter cloth to exhaust it by the impact force and backflow. Due to the use of nonwoven filter cloth, the installation area per unit processing gas capacity is less than that of other dust extraction methods.

In addition, due to the application of the nonwoven fabric filter cloth, the front filtration is possible, so that the filtration speed is 2 to 3 times faster than that of the woven fabric cloth. The disadvantage is that it is short.

The pulse-jet solenoid valve timer for the bag-filter dust collector, which is currently used the most, is used to reduce the filter filtration function, shorten the lifespan and waste energy due to inefficient operation by adopting the manual control method. It is causing.

In the conventional method, the solenoid valve is opened and closed at regular intervals regardless of the clogged state of the filter, causing repeated operation of blowing compressed air, causing energy waste. In addition, the life of the filter is shortened, causing many problems in maintenance. Some skilled workers have adjusted the on time and off time for solenoid valve opening and closing according to the degree of work based on experience.

In addition, if you are a beginner can be manually adjusted by entrusting the installation and maintenance manager, but due to manual operation can not be on / off at regular intervals, the maintenance of the filter is not performed smoothly, which increases the air pollution Of course, problems such as shortening the life of the filter are occurring. In addition, there is no alarm function in the event of a breakdown of the triac or solenoid valve, which is an actuator part of the solenoid valve timer, and thus, the side effect of the solenoid valve degrades the performance of the system.

In addition, the manometer, which shows the pressure difference between the front and rear of the filter so that the filter is replaced, is an analog type separate from the solenoid valve. The disadvantage is that the price is expensive because it depends on imports. Therefore, there is a need for a control system and control method capable of automatically controlling the opening and closing of the solenoid and recognizing a user for breakage of the solenoid.

Accordingly, the present invention has been made to solve the above problems, and equipped with a purge control algorithm for efficiently controlling the solenoid valve of the filter bag dust collector adopting the impact air flow method, opening and closing the solenoid valve in accordance with the filter state It provides automatic control of on time and off time, and provides an intelligent solenoid valve control system and control method for efficient filter maintenance with automatic alarm function in case of an error.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

An object of the present invention as described above, in the solenoid valve control system of the filter bag dust collector of the impact air flow system,

A pressure difference detector for measuring a pressure difference between the front and the rear of the filter and converting the measured analog signal into a digital signal and outputting a pressure difference digital signal; A fuzzy unit including a fuzzy control algorithm and outputting fuzzy control algorithm data; A control unit which receives the pressure difference digital signal output from the pressure difference detection unit and calculates and outputs a control signal using the amount of error and the pressure difference change as input signals using the fuzzy control algorithm data transmitted from the purge unit. It can be achieved by the solenoid valve control system of the air filter type filter bag dust collector, characterized in that for controlling the solenoid valve from the control signal.

The control signal may be an output signal for the on time and the off time of the solenoid valve, and may further include an actuator connected to the solenoid valve to operate the solenoid valve in accordance with the control signal.

The actuator may be characterized as being a triac.

The detector further includes a detection unit for detecting whether at least one of the solenoid valve and the actuator is damaged, and transmitting the detection signal to the control unit. The detection unit is configured as a current transformer, and the control unit transmits the detected detection signal to a purge control algorithm transmitted from the purge unit. By operating the control signal to the buzzer may be characterized in that for operating the buzzer.

The pressure differential detection unit includes a measurement unit including a differential pressure sensor to measure a pressure difference on the front and rear of the filter and output a pressure difference analog signal; An amplifier provided with an operational amplifier and amplifying the analog signal output from the measuring unit and outputting an amplified signal; And a digital converter converting the amplified signal output from the amplifier into a pressure difference digital signal that can be processed by the controller and outputting the pressure difference digital signal to the controller.

The control unit may further include a display unit configured to receive a control signal for the on time and the off time of the solenoid valve output from the control unit and a control signal for the operation of the buzzer to display the current pressure difference, the on time, and the off time. have.

As another category, an object of the present invention is to provide a pressure differential digital signal by measuring a pressure difference between the front and rear surfaces of a filter mounted inside a dust collector in a pressure difference detection unit in a solenoid valve control method using a control system. Outputting; Transmitting fuzzy control algorithm data to a control unit in a fuzzy unit including a fuzzy control algorithm; Calculating and outputting a control signal for an on time and an off time of the solenoid valve by using the fuzzy control algorithm data received from the fuzzy control unit by receiving the digital signal from the control unit as an input signal; And the solenoid valve is operated by a control signal. The solenoid valve control method using the solenoid valve control system of the filter bag dust collector of the impact air flow method may be achieved.

The operation step may be characterized in that the actuator connected to the solenoid valve is to operate the solenoid valve by receiving the control signal output from the control unit.

And detecting the damage of at least one of the solenoid valve and the actuator before the control signal output step, and transmitting the detection signal to the control unit, wherein the control unit transmits the received detection signal to the purge control algorithm received from the purge unit. It may be characterized in that the operation by outputting the control signal to operate the buzzer.

The digital signal output step may include: outputting a pressure difference analog signal by measuring a pressure difference between the front and rear surfaces of the filter in a measurement unit equipped with a differential pressure sensor; Amplifying the pressure differential analog signal in an amplifier having an operational amplifier and outputting an amplified signal; And converting the amplified signal in the digital converter into a pressure difference digital signal that can be processed by the controller, and outputting the pressure difference digital signal.

After the control signal output step, the display unit receives the control signal for the on time and off time of the solenoid valve and the control signal for the operation of the buzzer to display the current pressure difference and on time and off time; It can be characterized by.

Still another object of the present invention is a method of implementing a fuzzy control algorithm for obtaining a control signal for an on time and an off time for opening and closing of a solenoid valve in a control system, wherein an initial on time and an off time are set according to a fuzzy control algorithm. Making; Starting the initial operation of the control system; Setting a pressure difference as a reference value after the waiting time elapses when the set waiting time elapses; Measuring the first pressure difference after a predetermined time when the on time ends and the off time starts; Measuring a second pressure difference after an interval time set within an off time; Obtaining an error amount and a pressure difference change, which are input signals of a fuzzy control algorithm; Purging the input signal by a fuzzy control algorithm to output an on time and an off time of a next period by fuzzy inference; And continuously repeating the first pressure difference measuring step, the second pressure difference measuring step, the change amount obtaining step and the off time output step with respect to the set on time and the off time until the power is removed. It can be achieved by the method of implementing the fuzzy control algorithm of the solenoid valve control system of the air filter type filter bag dust collector.

The error amount is calculated by the difference between the first pressure difference and the reference value, and the reference value may be characterized in that the pressure difference at the time when the waiting time has elapsed from the time when the power is applied and every operation starts.

The pressure difference change amount may be a difference value between the first pressure difference and the second pressure difference.

Therefore, according to one embodiment of the present invention as described above, by automatically adjusting the on / off time according to the degree of clogging of the filter, compared with the conventional solenoid valve timer, the number of times of exhaustion and the operating time of the air compressor is Much smaller can extend the life of the filter and have a significant energy savings.

In addition, by using the current transformer to continuously monitor the system status, it can be delivered to the user in case of an abnormality and quick response, and the pressure difference and on / off time can be displayed in digital format instead of the manometer to display the system status and filter. It is easy to know the replacement time and can be installed immediately without modification of the existing equipment, which has the advantage of greatly improving the maintenance performance of the filter for the dust collector.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations are possible without departing from the spirit and scope of the present invention. Are all within the scope of the appended claims.

(Configuration of Solenoid Valve Control System of Shock Air Filter Filter Bag Dust Collector)

Hereinafter, with reference to the accompanying drawings will be described the configuration of the solenoid valve control system of the impact air filter type filter bag dust collector according to the present invention. First, Figure 1 shows a block diagram of the control system of the present invention.

As shown in FIG. 1, the control system measures a pressure difference between the front and rear surfaces of the filter 710 and a purge unit equipped with a pressure difference detector 100 and a purge control algorithm for digitally signaling the pressure difference. 300) and a control unit 200 which receives the pressure difference digital signal and outputs a control signal based on the error amount and the pressure difference change amount as input signals using the fuzzy control algorithm received from the purge unit 300. have. The solenoid valve 700 is controlled through the control signal of the controller 200.

Fig. 2 shows a block diagram of the configuration of the control system of the present invention in more detail. As shown in FIG. 2, the pressure difference detecting unit 100 includes a measuring unit 110, an amplifying unit 120, and a digital converter 130. The measuring unit 110 is provided as a differential pressure sensor to measure the pressure difference between the front and rear of the filter 710. At this time, the measured pressure difference is output as an analog signal and the analog signal is amplified by the amplifier 120 to the controller 200 in a range that meets the criteria. The amplifier 120 is composed of an operational amplifier (OP amplifier). The amplified pressure difference analog signal is converted into a pressure difference digital signal that can be recognized by the control unit 200 by the digital converter 130 (A / D converter), and is transmitted to the control unit 200.

In addition, the control system includes a detection unit 400. The detector 400 detects whether the actuator 600 and the solenoid valve 700 which operate the solenoid valve 700 independently of the pressure difference detector 100 are damaged or damaged. When the detection unit 400 detects damage to the actuator 600 and the solenoid valve 700, the detection signal for the detection unit 400 is transmitted to the control unit 200.

The control unit 200 receives the pressure difference digital signal from the pressure difference detection unit 100, calculates an error amount and a change in pressure difference, and uses them as an input signal using a fuzzy control algorithm transmitted from the purge unit 300 to output the solenoid as an output signal. The on / off time of the valve 700 is output. In addition, the detection signal is calculated through a fuzzy control algorithm to output the control signal to the buzzer 800. When broken or damaged, the buzzer 800 receiving the control signal is operated.

The on / off time, which is an output signal and a control signal obtained by calculating the fuzzy control algorithm, is transmitted to the actuator 600, and the actuator 600 operates the solenoid valve 700 based on the same. The actuator 600 operates the solenoid valve 700 at on time and stops operation of the solenoid valve 700 at off time. In addition, the actuator 600 is configured as a triac (TRIAC) in a specific embodiment. In addition, the control signal of the control unit 200 is also transmitted to the display unit 500. Therefore, the display unit 500 displays the current pressure difference and information on on time and off time so that the user can know.

3 illustrates that the control unit 200 receives the pressure difference digital signal and the detection signal, and calculates the received signal as a control signal through a fuzzy control algorithm, thereby converting the calculated control signal into the display unit 500 and the actuator 600. And a block diagram of a state output to the buzzer 800.

Figure 4 is a block diagram showing the configuration of the filter bag dust collector of the impact air flow type. As shown in FIG. 4, the dust collecting device uses five solenoid valves 700 and ten filters 710 as the impact air removing method. One solenoid valve 700 is provided with two filters 710 and uses an air compressor 720 to exhaust dust accumulated in the filter 710 into compressed air. The solenoid valve timer 730 is provided with a control unit 200, a purge unit 300, a detection unit 400, a display unit 500, and a buzzer 800 according to the present invention to control the solenoid valve 700. The blower is provided with a motor to discharge the air inside the dust collector through the outlet of the dust collector.

(Solenoid Valve Control Method Using Solenoid Valve Control System of Filter Airflow Dust Collector of Impact Airflow Method)

Hereinafter, a solenoid valve control method using the control system of the present invention will be described. 5 is a flowchart of a first embodiment of a solenoid valve control method using the control system of the present invention.

As shown in FIG. 5, the pressure difference detector 100 measures the pressure difference between the front and rear surfaces of the filter 710, amplifies the measured pressure difference, and converts the amplified pressure difference into a digital signal. ) Is output to (S10). In addition, the fuzzy unit 300 transmits a fuzzy control algorithm necessary for calculating a control signal from the controller 200 to the controller 200 (S11).

The controller 200 receiving the pressure difference digital signal obtains an error amount and a change amount of the pressure difference from the pressure difference (S12), and these are solenoid valves 700 through a purge control algorithm transmitted from the purge unit 300 as an input signal. The output signal for the on time and the off time is calculated (S13). Using the output signal as a control signal, the solenoid valve 700 is operated (S14).

Figure 6 shows a flowchart of a second embodiment of a solenoid valve control method using the control system of the present invention. As shown in Figure 6, by measuring the pressure difference between the front and rear of the filter 710 in the measuring means to output a pressure difference analog signal (S20). Then, the amplifier 120 having an operational amplifier (OP amplifier) amplifies the pressure difference to meet the range criteria to be processed by the control unit 200 (S21). The digital converter 130 converts the amplified pressure difference into a pressure difference digital signal so that the controller 200 can process the amplified pressure difference. Then, the pressure difference digital signal is transmitted to the control unit 200 (S22).

Then, the detection unit 400 determines whether the actuator 600 or the solenoid valve 700 is damaged, and if there is damage (S23), the detector outputs a detection signal and transmits it to the control unit 200 ( S24). The purge unit 300 transmits a fuzzy control algorithm for calculating a control signal from the control unit 200 to the control unit 200 (S25).

The controller 200 obtains an error amount and a pressure difference change amount as the received pressure difference digital signal (S26). The control unit 200 calculates an output signal for on time and off time by using the fuzzy control algorithm as an input signal as an error amount and a pressure difference change amount. This output signal is output as a control signal (S27). In addition, when the detection signal is received from the detector, the detection signal is also calculated as a control signal through a fuzzy control algorithm and the control signal is transmitted to the buzzer 800 so that the buzzer 800 rings. Therefore, the user can know whether the actuator 600 or the solenoid valve 700 is damaged. The actuator 600 receiving the control signal controls the solenoid to operate based on the control signal (S28), and the solenoid valve 700 is operated by the actuator 600 (S29).

(Method of Implementing Fuzzy Control Algorithm for Solenoid Valve Control System)

Hereinafter will be described a method of implementing a fuzzy control algorithm for controlling the solenoid valve by the control system of the present invention. First, FIG. 7 illustrates a flowchart of a method of implementing a fuzzy control algorithm for controlling a solenoid valve by the control system of the present invention. First, when power is applied to the control system, the on / off time for the initial operation of the solenoid valve 700 is set. In order to infer the on / off time of the next cycle of the solenoid valve 700, at the beginning of each operation, the on / off time used in the conventional solenoid valve 700 (e.g., on time -120 msec, off time -12 sec) is used. An initial on / off time (eg, on time-120 msec, off time-100 sec) is set according to the proposed fuzzy control algorithm (S30).

If the initial on / off time is set, the initial operation is started (S31). In the initial operation process, the first filter 710 to the last filter 710 perform one cycle of exhaustion in accordance with the on / off time, and the error difference and the pressure difference change amount, which are input signals of the fuzzy control algorithm, are measured by this pressure difference. We derive the output signal for the on / off time of the next cycle.

Error amount means the difference between the pressure difference and the reference value. Therefore, in order to calculate the error amount, the reference value should be determined. However, since the pressure difference continues to change until the filter 710 is replaced, proper control is achieved by resetting the reference value at each start of operation. In addition, since the transient state is maintained at the initial stage when the power is applied and the pressure difference cannot be accurately measured, the pressure difference measured after the waiting time (S32) after the waiting time (for example, 5 seconds) is determined as a reference value. (S33).

Then, when the set off time starts (S34), the measuring unit 110 measures the first pressure difference (S35). 8A illustrates the on time and the off time of the conventional solenoid valve 700. The valve 700 is uniformly operated at the on time and turned off at the off time. However, since the range of the off time (between the on time and the on time of each valve) is 5 to 60 seconds in the related art, when the short off time is less than 30 seconds, the change in pressure difference is too small to measure the change.

8B illustrates on time and off time according to the present invention. As shown in Fig. 8B, there is a delay time (for example, 2 seconds) between the valve and the on time of the valve, and there is no off time, and the off time is the off time of the conventional invention (between the valve and the valve of the conventional invention). (Off time), the valves are operated continuously, and the off time is output for a sufficiently long time after the on time of all the valves. Therefore, the off time in this invention is represented by following formula (1).

Off time of the invention = (off time between valve and valve in conventional manner-2 seconds) * number of valves

2 seconds corresponds to the delay time of the valve. Therefore, it is easy to measure the amount of change in pressure difference because the off time is made for a sufficiently large time. The first pressure difference is measured after a predetermined time (for example, 3 seconds) for the set off time, and the second pressure difference is measured after an interval time (for example, 30 seconds) within the off time range (S36). (S37). Here, the interval time is set to a sufficiently large time within the range of the off time. The controller 200 calculates an error amount that is a difference between the first pressure difference and the set reference value (S38).

Further, the pressure difference change amount is calculated based on the difference between the second pressure difference and the first pressure difference (S39). Therefore, the error amount and the pressure difference change which are input variables of the fuzzy control algorithm are obtained. An input variable is fuzzy by a fuzzy control algorithm to fuzzy reasoning of an on / off time of a next period (S40). When outputting the on / off time, the solenoid valve 700 is operated based on this output signal (S41). When the on time according to the next cycle ends, the operation of inferring the next on / off time is repeated by measuring the first pressure difference and the second pressure difference again (S42). This iteration is performed until the application of power is removed.

1 is a block diagram of a solenoid valve control system of a filter bag dust collecting device of the impact air type according to the present invention,

Figure 2 is a block diagram of a solenoid valve control system of the filter bag dust collector of the impact air flow method according to the present invention,

3 is a block diagram illustrating a signal transmitted to a control unit and an output control signal;

Figure 4 is a block diagram of a solenoid valve control system of the impact air filter type filter bag dust collector according to the present invention,

5 is a flowchart of a first embodiment of a solenoid valve control method using the control system of the present invention;

6 is a flowchart of a second embodiment of a solenoid valve control method using the control system of the present invention;

7 is a flowchart of a method of implementing a fuzzy control algorithm for controlling a solenoid valve by the control system of the present invention;

8a is a time graph showing on time and off time of a conventional solenoid valve;

8B is a time graph showing on time and off time according to the fuzzy control algorithm of the present invention.

<Description of the symbols for the main parts of the drawings>

100: pressure differential detection unit

110: measurement unit

120: amplifier

130: digital converter

200: control unit

300: fuzzy part

400: detection unit

500: display unit

600: Actuator

700: solenoid valve

710: filter

720: compressor

730: solenoid valve timer

740: blower

750: collected dust

800: buzzer

a: one cycle time

Claims (7)

delete delete delete delete In the solenoid valve control method using the solenoid valve control system of the filter bag dust collector of the impact air type, Outputting a pressure difference digital signal by measuring a pressure difference between the front and the rear of the filter mounted inside the dust collector in the pressure difference detector; Detecting whether the at least one of the solenoid valve and the actuator is damaged by the detector and transmitting a detection signal to the controller; Transmitting the fuzzy control algorithm to a control unit by a fuzzy unit having a fuzzy control algorithm; Calculating and outputting a control signal for an on time and an off time of the solenoid valve by using the fuzzy control algorithm received from the fuzzy control unit by receiving the digital signal from a control unit as an input signal; A display unit receiving the control signal and displaying a current pressure difference, an on time, and an off time; And And operating the solenoid valve by the control signal. The operation step, An actuator connected to the solenoid valve receives the control signal output from the controller to operate the solenoid valve, The digital signal output step, Outputting a pressure difference analog signal by measuring a pressure difference between the front and rear surfaces of the filter in a measurement unit including a differential pressure sensor; Amplifying the pressure differential analog signal in an amplifier having an operational amplifier and outputting an amplified signal; And And converting the amplified signal into a pressure difference digital signal that can be processed by the controller, and outputting the pressure difference digital signal in a digital converter. In the step of calculating and outputting the control signal, the fuzzy control algorithm implementation method for obtaining the control signal, Setting an initial on time and an off time according to the fuzzy control algorithm; Initiating an initial operation of the control system; Setting a pressure difference as a reference value after the waiting time has elapsed; Measuring the first pressure difference after a predetermined time when the on time ends and the off time starts; Measuring a second pressure difference after an interval time set within the off time; Obtaining an error amount and a pressure difference change amount which are input signals of the fuzzy control algorithm; Purging the input signal by the fuzzy control algorithm to output an on time and an off time of a next period by fuzzy inference; And And repeatedly repeating the first pressure difference measurement step, the second pressure difference measurement step, the change amount obtaining step and the off time output step for the set on time and off time until power is removed. The error amount is, Calculated as a difference between the first pressure difference and a reference value, The reference value is the pressure difference from the time when the waiting time has elapsed from the time when power is applied and every work starts, The change amount of the pressure difference is a solenoid valve control method using a solenoid valve control system of the impact air flow type filter bag dust collector, characterized in that the difference between the first pressure difference and the second pressure difference. delete delete

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