JP4057795B2 - Static eliminator cleaning time display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a static eliminator that eliminates static electricity while balancing positive and negative ions, and more particularly, to a cleaning timing display device that informs the cleaning timing of the discharge electrode.
[0002]
[Prior art]
Conventionally, in a static eliminator that performs ion balance control, a discharge current or an ion current is detected to control the voltage applied to the discharge electrode, and at the same time, when the control value exceeds a preset limit value, It has been common practice to issue a cleaning alarm to encourage electrode cleaning.
[0003]
For example, Japanese Patent Laid-Open No. 8-298197 discloses a technique for performing ion balance control and a cleaning alarm in an AC type static eliminator as follows. That is, the induced voltages of the first to third ion sensors sequentially arranged in the ion movement path are input to a pair of differential amplifiers, and the outputs of these differential amplifiers are added and offset by the ion balance unit according to the sum. By adjusting the voltage and changing the amplitude of the output voltage of the AC high voltage generator to the positive side or the negative side, ion balance is achieved and the ion balance state is displayed in a bar graph. Further, the output of the pair of differential amplifiers is compared with the cleaning alarm reference value, and a cleaning alarm is notified by lighting the lamp.
[0004]
[Problems to be solved by the invention]
However, in the conventional method of monitoring whether a certain reference value (limit value) has been exceeded or not, and issuing a cleaning alarm at the time when the value is exceeded, the alarm timing cannot be predicted and the alarm is suddenly issued. Therefore, when the static eliminator is used, for example, in a work line of a factory, there are problems that the work must be interrupted suddenly or anxiety is given to the worker.
[0005]
In view of such problems, an object of the present invention is to provide a cleaning timing display device for a static eliminator that can visually check a cleaning timing that is a period until cleaning is required or a cleaning alarm is performed. There is to do.
[0006]
[Means for Solving the Problems]
The present invention applies positive and negative DC high voltages to positive and negative discharge electrodes from positive and negative high voltage generation circuits to generate positive and negative ions, and detects positive and negative ion currents or discharge currents with current detection means. In the static eliminator that calculates the positive and negative balance values necessary for ion balance by the calculation means and feedback-controls the positive and negative high voltage generation circuit by the control means according to the balance value, the cleaning time is displayed by the following means It is characterized by doing.
(1) Initial setting value setting means for initial setting so that the positive and negative initial setting values A and C of the positive and negative high voltage generating circuits are lowered when one of the positive and negative values is raised, and N light emitting diodes are arranged. And a cleaning time indicator for displaying the cleaning time in stages according to the number of operations.
(2) The control means controls the positive and negative high voltage generation circuits according to the balance value obtained by the calculation means.
(3) The calculating means is based on the positive and negative initial setting values A and C set by the initial setting value setting means, the predetermined positive and negative cleaning alarm setting values B and D, and the number N of light emitting diodes. If positive, the difference between the initial set value A and the cleaning alarm set value B is divided into (B−A) / N. If negative, the initial set value C and the cleaning alarm set value D are divided. Is divided into (D−C) / N, and it is determined for each of the positive and negative balance values at which the calculated balance value at power-on corresponds to the division point. By adopting the larger one of the steps and operating the corresponding number of light emitting diodes, the cleaning time indicator displays the cleaning time of the discharge electrode.
[0007]
The cleaning time indicator can periodically display the cleaning time even after the power is turned on.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0009]
FIG. 1 shows the configuration of a static eliminator to which the present invention is applied. This static eliminator is a DC type, and positive and negative ions are generated by applying positive and negative DC high voltages from positive and negative high voltage generation circuits 2a and 2b to positive and negative discharge electrodes 1a and 1b, respectively. The positive and negative ion current detection electrodes 3a and 3b detect the voltages, and the A / D converter 4 converts them into digital values. FIG. 2 is a graph showing the relationship between the input and output of the A / D converter 4.
[0010]
A / D converted positive and negative ion currents are input as digital ion signals to the CPU 5 which is both a calculation means and a control means, and the positive and negative balance values necessary for ion balance are calculated. Then, control amounts for the positive and negative high voltage generation circuits 2a and 2b are obtained from the positive and negative balance values, and these are input as digital control signals to the positive and negative D / A converters 6a and 6b to convert them into analog. After that, the positive and negative high voltage generation circuits 2a and 2b are feedback-controlled to perform ion balance.
[0011]
As shown in the graph of FIG. 3, each of the positive and negative high voltage generation circuits 2a and 2b can be controlled within a high voltage control range in which the initial set value is the lower limit and the cleaning alarm set value is the upper limit. The positive and negative initial setting values can be adjusted with the adjustment dial 7, and when one of the positive and negative values is raised, the other is lowered.
[0012]
The static eliminator also includes a cleaning time indicator (cleaning time display means) 9 that is operated by the display driver 8 under the control of the CPU 5 and an alarm device 11 that is operated by the alarm driver 10 under the control of the CPU 5. . In the case of this example, the cleaning time indicator 9 has eight light emitting diodes 12 arranged in a horizontal row.
[0013]
Since the cleaning time indicator 9 is composed of eight light emitting diodes 12, the cleaning time can be displayed in eight stages by increasing the number of blinks from left to right. As the number of flashing light emitting diodes 12 increases, the cleaning time is approaching. FIG. 4 shows the relationship between a hexadecimal display value that determines the number of blinks, with binary “1” being displayed (flashing) and “0” not being displayed. This relationship is registered in a table (display address table) in the CPU 5.
[0014]
The cleaning time indicator 9 can also be used as an ion balance indicator that displays the state of ion balance. In that case, the left side is negative and the right side is positive. When the display is biased to the left, negative ions are dominant, and when the display is biased to the right, positive ions are dominant.
[0015]
Further, since the cleaning time is displayed in 8 stages, as shown in FIG. 5, the control signals for the positive and negative high voltage generation circuits 2a and 2b are also set to an initial set value that is a high voltage control range for both positive and negative. There are 8 steps between the cleaning alarm set value. Balance control is possible between these eight stages. Here, the initial setting value of the control signal for the positive high voltage generating circuit 2a is A, the cleaning alarm setting value is B, the initial setting value of the control signal for the negative high voltage generating circuit 2b is C, and the cleaning alarm setting value is D. It is said.
[0016]
Next, the flow of processing performed when the static eliminator is turned on will be described with reference to the flowcharts of FIGS.
[0017]
In FIG. 6, when the power is turned on, the CPU 5 is initialized in step S1, and then the initial value of the positive control signal is set in step S2 and the initial value of the negative control signal is set in step S3. Is called. In the following step S4, the detected positive ion signal is taken in, the positive balance value (balance point) is calculated and a positive control signal is output, and in step S5, the negative balance signal is output. The value (balance point) is calculated, a negative control signal is output, and initial balance control is performed. Thereafter, the process proceeds to step S6, and the cleaning display subroutine shown in FIG. 7 is called.
[0018]
In FIG. 7, it is first determined whether or not the power is turned on in step S11. If the power is turned on, (BA) / 8 is calculated in step S12 and the positive cleaning alarm set value is obtained. A value obtained by dividing the interval between the initial setting value and the initial setting value by 8 is stored in the first memory, and (DC) / 8 is calculated in step S13, and the negative cleaning alarm setting value and the initial setting value are calculated. A value obtained by dividing the interval into 8 is stored in the second memory. In the following, the value divided into eight is referred to as “1/8” for convenience.
[0019]
Next, in step S14, the positive balance value at power-on is calculated as described above and stored in the third memory. Similarly, in step S15, the negative balance value at power-on is calculated. And stored in the fourth memory. In the following step 16, “08” is set in the counter and the display address table is set to the initial value. In step S17, the value obtained by adding the initial set value A on the positive side to the value in the first memory is obtained. Stored in the fifth memory. Since the first memory stores the value divided into eight in step 12, as described above, in step 17, the value obtained by adding 1/8 to the initial set value A is stored in the fifth memory. Become.
[0020]
Thereafter, it is determined in steps S18 to S21 as to which point of the positive eight division points in FIG. 5 corresponds to the positive balance value (balance point) when the power is turned on. That is, in step S18, the value of the fifth memory is compared with the value of the third memory, that is, the positive balance value (balance point) at the time of turning on the power. If the former value is smaller than the latter value, In order to shift the judgment point of 8 divisions to the next point, a value obtained by adding the value of the first memory to the value of the fifth memory is newly stored in the fifth memory in step S19. In step 20, the address of the display address table is incremented, and the counter is decremented. Subsequently, in step S21, it is determined whether the counter has reached "00". If not, the process returns to step S18.
[0021]
If it is determined in step S18 that the value of the fifth memory is not smaller than the value of the third memory (the value of the fifth memory is the value of the third memory), the process proceeds to step 22, and the positive side at power-on The cleaning display data (hexadecimal display value in FIG. 4) corresponding to the balance value (balance point) is stored in the first memory.
[0022]
Next, the same processing is performed on the negative side in steps S23 to S29. That is, in step 23, "08" is set in the counter and the display address table is set to the initial value. In step S24, the negative initial set value C is added to the value in the second memory. The value is stored in the fifth memory. In the second memory, the value obtained by dividing into eight in step 13 is stored as described above. Therefore, in step 24, a value obtained by adding 1/8 to the initial set value C is stored in the fifth memory. Become.
[0023]
Thereafter, in order to determine which of the negative eight division points in FIG. 5 corresponds to the negative balance value (balance point) when the power is turned on, the value of the fifth memory is set to the fourth memory in step S25. Value, that is, the negative balance value (balance point) at the time of power-on, and when the former value is smaller than the latter value, the decision point of 8 divisions is shifted to the next point, In step S26, a value obtained by adding the value of the second memory to the value of the fifth memory is newly stored in the fifth memory. In step 27, the address of the display address table is incremented, and the counter is decremented. Subsequently, in step S28, it is determined whether or not the counter has reached “00”. If not “00”, the process returns to step S25.
[0024]
If it is determined in step S25 that the value in the fifth memory is not smaller than the value in the fourth memory (the negative balance value when the power is turned on), the process proceeds to step 29, and the negative balance when the power is turned on. Cleaning display data corresponding to the value (balance point) (hexadecimal display value in FIG. 4) is stored in the second memory.
[0025]
Next, the value of the first memory is compared with the value of the second memory at step 30. If the former is smaller than the latter, the value of the second memory is replaced with the first memory at step 31, and so on. If not, the value in the first memory is used as the cleaning display data in step 32. That is, the larger one of the positive and negative balance values at power-on is adopted, and the cleaning display data (hexadecimal display value in FIG. 4) corresponding to the balance value is stored. The cleaning display data is converted into a blinking signal for the light emitting diode 12 with reference to the display address table shown in FIG. 4 in the last step S33 of FIG. 7, and the CPU 5 in FIG. Is output. For example, when the larger one of the positive and negative balance values at the time of power-on corresponds to the hexadecimal display value “E0H” in FIG. 4, the first, second, This is a signal for blinking the light emitting diodes 12 up to No. 3.
[0026]
When the processing as described above shown in FIG. 7 is completed, the process proceeds from step S6 to step S7 in FIG. 6, and various controls and operations are performed by the main program. Here, in the case of the above specific example, the cleaning time indicator 9 indicates that the three light emitting diodes 12 from the first to the third among the eight light emitting diodes 12 are blinked, and the cleaning time is in eight stages. The third stage is displayed when the power is turned on. The display of the cleaning time by the blinking can be periodically performed even after the power is turned on.
[0027]
【The invention's effect】
As described above, according to the present invention, the cleaning period of the discharge electrode, which is the period until cleaning is required or the period until the cleaning alarm is performed, is visually checked when the power is turned on by the number of operating light emitting diodes of the cleaning period indicator. This makes it possible to check easily, and it is possible to carry out inspection and cleaning before work, and troubles during work can be solved. Further, since the maintenance of the static eliminator varies greatly depending on the work environment, the static eliminator can be efficiently managed by using the cleaning time display device of the present invention. Further, for each of positive and negative, the difference between the initial setting value and the predetermined cleaning alarm setting value is divided by the number of light emitting diodes to determine the balance value step by step, of the positive and negative balance value steps Since the larger number of steps is used to operate the number of light emitting diodes, it is possible to display the cleaning time corresponding to one of the positive and negative balance values for ion balance every time the power is turned on.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a static eliminator to which the present invention is applied.
FIG. 2 is a graph showing the relationship between input and output of the A / D converter in FIG.
FIG. 3 is a graph showing the relationship between the input of the D / A converter in FIG. 1 and a high voltage control range for a high voltage generation circuit.
FIG. 4 is a diagram showing a relationship between eight light emitting diodes of a cleaning time indicator and a display address table for determining the number of blinking lamps.
FIG. 5 is a diagram showing that control signals for controlling positive and negative high voltage generation circuits are divided into eight stages between an initial set value and a cleaning alarm set value.
FIG. 6 is a flowchart of main processing performed when power is turned on.
FIG. 7 is a flowchart of processing performed to display a cleaning time when power is turned on.
[Explanation of symbols]
1a and 1b Positive and negative discharge electrodes 2a and 2b Positive and negative high voltage generation circuits 3a and 3b Positive and negative ion current detection electrodes 4 A / D converter 5 CPU
6a, 6b Positive / negative D / A converter 7 Adjustment dial 8 Display driver 9 Cleaning time indicator (cleaning time display means)
10 Alarm Driver 11 Alarm 12 Light Emitting Diode

Claims (2)

Positive and negative DC high voltages are applied to the positive and negative discharge electrodes from the positive and negative high voltage generation circuits to generate positive and negative ions, and positive and negative ion currents or discharge currents are detected by the current detection means for ion balance. In the static eliminator that calculates the positive and negative balance values required for the calculation means, and feedback-controls the positive and negative high voltage generation circuit according to the balance value by the control means,
Initial setting value setting means for initially setting positive and negative initial setting values A and C of the positive and negative high voltage generation circuit so that when one of the positive and negative values is raised, the other is lowered;
A cleaning time indicator that arranges N light emitting diodes and displays the cleaning time step by step according to the number of operating the light emitting diodes,
The control means controls the positive and negative high voltage generation circuit according to the balance value obtained by the calculation means,
The arithmetic means includes the positive and negative initial setting values A and C set by the initial setting value setting means, predetermined positive and negative cleaning alarm setting values B and D, the number N of light emitting diodes, and the like. From the initial setting value A and the cleaning alarm setting value B is divided into (B−A) / N when positive, and the initial setting value C and the cleaning alarm setting value D are negative when negative. The difference between the two is divided into (D−C) / N, and it is determined for each of the positive and negative balance values at which the calculated balance value at power-on corresponds to the positive and negative balance values. Of the stages, the larger one of the stages is employed to operate the corresponding number of the light emitting diodes so that the cleaning timing indicator displays the cleaning timing of the discharge electrode. Training time display device.   2. The neutralizing device cleaning time display device according to claim 1, wherein the cleaning time indicator periodically displays the cleaning time even after the power is turned on.

Images