A method and device for detecting the response rate of an electrostatic sensor

Abstract

A method and device for detecting the response rate of an electrostatic sensor, belonging to the field of testing. It includes: analyzing the movement and electrification of materials at the production site; establishing a model for the electrification of moving objects at the site; building a test device according to the moving electrification model; selecting a test electrification model according to the usage scenario of the electrostatic sensor; starting the test device to output a standard voltage waveform corresponding to the selected test electrification model; monitoring the detected output waveform of the electrostatic sensor; comparing, analyzing and judging the detected output waveform of the electrostatic sensor and the standard voltage output waveform in real time; obtaining the highest response rate of the electrostatic sensor. By comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor, it judges the response frequency of the electrostatic sensor. Only the time values at the peaks of the two waveforms need to be monitored, and simple addition and subtraction operations can be used to draw a conclusion, eliminating complex programming operations, being simple, convenient and highly reliable. It can be widely used in the detection field of electrostatic sensor products.

Description

Technical Field

[0001] The present invention belongs to the field of testing, and particularly relates to a method and device for detecting the response rate of an electrostatic sensor. Background Art

[0002] At present, electrostatic sensors (hereinafter simply referred to as sensors) have been widely used in the static electricity monitoring of industrial production products, playing a crucial role in preventing products from being damaged by electrostatic discharge.

[0003] However, various complex situations may occur in the actual production and manufacturing process. For example, the objects moving on the assembly line move at a relatively high speed, or the static electricity amounts and polarities carried by the objects arriving at the electrostatic sensor successively vary greatly. This poses high performance requirements for the response rate of the sensor, and there is no good method to determine whether the existing sensors can meet the requirements of actual production.

[0004] Generally, the following measures are usually adopted to improve the display / communication transmission rate of the sensor:

[0005] a) Shorten the sampling period of the sensor data acquisition unit to increase the sampling frequency;

[0006] b) On the basis of increasing the sampling frequency, increase the transmission frequency of the data to the display device.

[0007] The existing technical solutions have the following technical defects:

[0008] a) The existing technical solutions only increase the sampling, communication / display rate. It is unknown whether the electrostatic sensor can truly and accurately display the static voltage on the object surface, and even masks the true charging situation of the moving charged object;

[0009] b) When the object moves at a relatively high speed, the displayed static voltage value lags behind the true static voltage value, causing obstacles to production control or having to reduce production efficiency;

[0010] c) When the charge amounts and polarities of the front and rear objects vary greatly, serious distortion will occur, and the true static voltage value on the object surface cannot be accurately displayed, posing a major hidden danger to product quality. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a method and device for detecting the response rate of an electrostatic sensor. It adopts the method of simulating a charged object moving rapidly and an object with rapidly changing charge quantity and polarity in the actual production process, and by comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor to judge the response frequency of the electrostatic sensor. Only the time values at the peaks of the two waveforms need to be monitored, and a simple addition and subtraction operation can be used to draw a conclusion, eliminating complex programming operations, being simple, convenient and highly reliable; the implementation of the technical solution of the present invention is conducive to establishing a standardized electrostatic detection test method.

[0012] The technical solution of the present invention is: to provide a method for detecting the response rate of an electrostatic sensor, which is characterized by including the following steps:

[0013] 1.1) Analyze the movement and charging conditions of materials at the production site;

[0014] 1.2) Establish a moving charged model of on-site objects;

[0015] 1.3) Build a test device according to the moving charged model;

[0016] 1.4) Select a test charged model according to the usage scenario of the electrostatic sensor;

[0017] 1.5) Start the test device and output a standard voltage waveform corresponding to the selected test charged model;

[0018] 1.6) Monitor the detected output waveform of the electrostatic sensor;

[0019] 1.7) Compare, analyze and judge the detected output waveform of the electrostatic sensor and the standard voltage output waveform in real time;

[0020] 1.8) Obtain the highest response rate of the electrostatic sensor.

[0021] Specifically, the movement and charging conditions of materials at the production site, the moving charged model or the test charged model include:

[0022] 2.1) For the same process operation of the same product, the charge quantity or static voltage of the objects before and after transmission is basically the same, the charging polarity is the same, and the moving speed is consistent; at this time, the test charged model adopts a square wave half-wave signal output;

[0023] 2.2) For the same process operation of different products, the charge quantity or static voltage of the objects before and after is basically the same, the charging polarities are opposite, and the moving speed is consistent; at this time, the test charged model adopts a square wave full-wave signal output;

[0024] 2.3) For different process operations on the same product, the charge amount or static voltage of the objects before and after is different, with some being high and some being low, the charging polarities are the same, and the moving speeds are consistent; at this time, the test charging model uses a sine half-wave signal output;

[0025] 2.4) For different process operations on different products, the charge amount or static voltage of the objects before and after is different, with some being high and some being low, the charging polarities are opposite, and the moving speeds are consistent; at this time, the test charging model uses a sine full-wave signal output;

[0026] 2.5) When the process operation is started and the process speed is continuously increased, the object moves from rest to accelerated motion, the charge amount gradually increases from zero, and the static voltage gradually increases from zero; as the production operation approaches completion, the process operation gradually stops, the process speed continuously decreases, the object moves from motion to rest, the charge amount gradually decreases from the maximum, and the static voltage gradually decreases from the maximum; at this time, the test charging model uses a sawtooth wave signal output.

[0027] Specifically, a varying high voltage is applied to an insulating flat electrode of the test device;

[0028] The high voltage is generated and output by a high-voltage waveform generating device or a high-voltage power amplifying device;

[0029] A voltage waveform generating device is provided for generating and outputting the required standard voltage waveform;

[0030] The voltage waveform generating device transmits the standard voltage waveform to the high-voltage waveform generating device or the high-voltage power amplifying device to control the waveform of the high voltage output by the high-voltage waveform generating device or the high-voltage power amplifying device;

[0031] The selection of the standard voltage waveform is made correspondingly according to the moving charging model of the object.

[0032] Specifically, the test device includes a voltage waveform generating device for generating various types of low-voltage waveforms with adjustable frequencies;

[0033] The voltage waveform generating device transmits the output low-voltage waveform to the high-voltage waveform generating device or the high-voltage power amplifying device, and the high-voltage waveform generating device or the high-voltage power amplifying device amplifies the input low-voltage waveform without distortion and outputs a high voltage of the same waveform;

[0034] A flat electrode is provided, and the size of its use surface is the same as the size of the charged surface of the object to be monitored on-site. The high-voltage waveform output by the high-voltage waveform generating device or the high-voltage power amplifying device is applied to this flat electrode;

[0035] The static electricity sensor to be measured is installed and fixed on a distance regulator. The distance regulator can set the detection distance through a scale corresponding to it, and this detection distance is the on-site installation distance;

[0036] Use an oscilloscope to monitor the detected voltage output value of the electrostatic sensor and the standard high-voltage output value of the flat electrode.

[0037] Furthermore, the standard voltage waveform or low-voltage waveform at least includes a square wave, a sine wave, or a sawtooth wave.

[0038] Furthermore, the amplitude of the high voltage output by the high-voltage waveform generating device or the high-voltage power amplifying device should be determined according to the static charge amount or static voltage magnitude on the object surface at the application site of the electrostatic sensor;

[0039] The frequency of the high voltage output by the high-voltage waveform generating device or the high-voltage power amplifying device should be determined according to the following formula:

[0040]

[0041] Wherein, f is the frequency of the waveform signal, v is the moving rate of the object on the production line, and s is the distance between two adjacent objects or the distance between two peak static voltages on the object surface.

[0042] Specifically, when the electrostatic sensor outputs a waveform with a peak voltage of U and a voltage frequency of f, the peak static voltage V detected by the electrostatic sensor should satisfy:

[0043]

[0044] Wherein, U is the peak voltage applied on the flat electrode, and 5% is the allowable error range;

[0045] The electrostatic sensor should also satisfy:

[0046]

[0047] Wherein, t τ is the time delay of the peak static voltage detected by the electrostatic sensor compared to the peak of the high-voltage waveform output to the flat electrode, and 5% is the allowable error range;

[0048] If the electrostatic sensor simultaneously satisfies the above two conditions and also satisfies the following conditions:

[0049] 1) When the output frequency of the standard high-voltage waveform is f n , it satisfies: |V - U| / |U|×100% ≤ 5% and t τn ≤ 1 / f n ×5%;

[0050] 2) When the output frequency of the standard high-voltage waveform is f n+1 (f n+1 > f n) When, it satisfies: |V - U| / |U| × 100% > 5% or t τn+1 > 1 / f n+1 × 5%.

[0051] Then the highest response rate of the electrostatic sensor can be determined as f n .

[0052] Specifically, the method for detecting the response rate of the electrostatic sensor realizes the simulation test of a moving object with the same charge quantity and the same polarity before and after and a consistent moving speed by adopting the standard voltage waveform output of a square-wave half-wave high-voltage signal;

[0053] Realizes the simulation test of a moving object with the same charge quantity but opposite polarities before and after and a consistent moving speed by adopting the standard voltage waveform output of a square-wave full-wave high-voltage signal;

[0054] Realizes the simulation test of a moving object with different charge quantities before and after and the same polarity and a consistent moving speed by adopting the standard voltage waveform output of a sine-wave half-wave high-voltage signal;

[0055] Realizes the simulation test of a moving object with different charge quantities but opposite polarities before and after and a consistent moving speed by adopting the standard voltage waveform output of a sine-wave full-wave high-voltage signal;

[0056] Realizes the simulation test of a moving object whose process speed is continuously accelerating, the object moves from rest to motion, the charge quantity gradually increases, and the static voltage gradually increases; subsequently, the process operation gradually stops, the process speed continuously decreases, the object moves from motion to rest again, the charge quantity gradually decreases, and the static voltage gradually decreases by adopting the standard voltage waveform output of a sawtooth-wave high-voltage signal.

[0057] The present invention also provides a device for detecting the response rate of an electrostatic sensor, and its characteristics are:

[0058] A flat electrode is provided for simulating the charged surface of the object to be monitored on-site;

[0059] A voltage waveform generating device is provided for generating and outputting various types of low-voltage waveforms with adjustable frequencies;

[0060] A high-voltage power amplification device is provided for amplifying the low-voltage waveform output by the voltage waveform generating device without distortion and outputting a high voltage of the same waveform;

[0061] The output end of the high-voltage power amplification device is connected to the flat electrode, and a high-voltage waveform output by the high-voltage power amplification device is applied to the flat electrode;

[0062] A distance regulator is provided above the flat electrode for fixing the electrostatic sensor to be measured;

[0063] The electrostatic sensor to be tested is used to detect the static voltage on the flat electrode;

[0064] The distance regulator can adjustably set the detection distance between the electrostatic sensor to be tested and the flat electrode through a scale corresponding to it;

[0065] An oscilloscope is set up. One input terminal of the oscilloscope is connected to the flat electrode, and the other input terminal is connected to the signal output terminal of the electrostatic sensor to be tested, for real-time monitoring of the detected voltage output value of the electrostatic sensor and the standard high-voltage output value of the flat electrode;

[0066] The response frequency of the electrostatic sensor is judged by comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor.

[0067] Furthermore, a high-voltage probe is provided between the flat electrode and the oscilloscope;

[0068] The flat electrode is insulated and fixed through an insulating bracket;

[0069] The distance regulator is arranged perpendicular to the flat electrode;

[0070] The low-voltage waveform generated by the voltage waveform generating device at least includes a square wave, a sine wave or a sawtooth wave;

[0071] The voltage waveform generating device and the high-voltage power amplification device are connected in series in sequence to form a high-voltage waveform generating device, and the output terminal of the high-voltage waveform generating device is electrically connected to the flat electrode.

[0072] Compared with the prior art, the advantages of the present invention are:

[0073] 1. The technical solution of the present invention provides an effective and convenient method to simulate a real moving charged object to test the response rate of the electrostatic sensor, which is the time response ability for electrostatic detection of a moving object.

[0074] 2. It provides an effective method for the electrostatic sensor to specifically monitor objects with specific movements and specific charged conditions, realizing the differentiated and diverse applications of the product.

[0075] 3. By adopting the output of a square-wave half-wave high-voltage signal, it scientifically and conveniently realizes the simulation test of a moving object with the same charge quantity and the same polarity and the same moving speed before and after. It overcomes the defects of complex operation, difficulty, easy error, susceptibility to various external factors, and inability to perform standard and accurate quantitative calculations when directly testing a real moving charged object on a conveyor device.

[0076] 4. By adopting a square-wave full-wave high-voltage signal output, the analog test of moving objects with the same charge quantity but opposite polarities and consistent moving speeds before and after is scientifically and conveniently realized, overcoming the defects of complex operation, difficulty, easy error, susceptibility to various external factors, and inability to perform standard and accurate quantitative calculations when directly testing real moving charged objects on the conveying device.

[0077] 5. By adopting a sine half-wave high-voltage signal output, the analog test of moving objects with different charge quantities, the same polarities, and consistent moving speeds before and after is scientifically and conveniently realized, overcoming the defects of complex operation, difficulty, easy error, susceptibility to various external factors, and inability to perform standard and accurate quantitative calculations when directly testing real moving charged objects on the conveying device.

[0078] 6. By adopting a sine full-wave high-voltage signal output, the analog test of moving objects with different charge quantities but opposite polarities and consistent moving speeds before and after is scientifically and conveniently realized, overcoming the defects of complex operation, difficulty, easy error, susceptibility to various external factors, and inability to perform standard and accurate quantitative calculations when directly testing real moving charged objects on the conveying device.

[0079] 7. By adopting a sawtooth-wave high-voltage signal output, the analog test of moving objects whose process speed is continuously accelerating, the object moves from rest to motion, the charge quantity gradually increases, and the static voltage gradually increases; subsequently, the process operation gradually stops, the process speed continuously decreases, the object moves from motion to rest again, the charge quantity gradually decreases, and the static voltage gradually decreases is scientifically and conveniently realized, overcoming the defects of complex operation, difficulty, easy error, susceptibility to various external factors, and inability to perform standard and accurate quantitative calculations when directly testing real moving charged objects on the conveying device.

[0080] 8. The method of judging the response frequency of the electrostatic sensor by comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor only needs to monitor the time values at the peaks of the two waveforms (or the time difference at the peaks of the two waveforms), perform simple addition and subtraction operations, and then the conclusion can be drawn, saving complex programming operations, being simple, convenient, and highly reliable.

[0081] 9. The implementation of the technical solution of the present invention is conducive to establishing a standardized electrostatic detection test method. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 It is a block diagram of the overall technical solution of the present invention;

[0083] Figure 2-1 It is a schematic diagram of the electrostatic detection of a moving charged object;

[0084] Figure 2-2 Schematic diagram for electrostatic detection of another moving charged object

[0085] Figure 3 Schematic diagram of the composition of the simulation test device for electrostatic detection of moving charged objects according to the present invention

[0086] Figure 4 Schematic diagram of the composition of another simulation test device for electrostatic detection of moving charged objects according to the present invention

[0087] Figure 5 Block flow chart of the test method according to the present invention

[0088] Figure 6-1 Schematic diagram for simulation test of electrostatic detection of moving charged objects - positive half-wave high-voltage detection of square wave

[0089] Figure 6-2 Schematic diagram for simulation test of electrostatic detection of moving charged objects - negative half-wave high-voltage detection of square wave

[0090] Figure 7 Schematic diagram for simulation test of electrostatic detection of moving charged objects - full-wave high-voltage detection of square wave

[0091] Figure 8-1 Schematic diagram for simulation test of electrostatic detection of moving charged objects - positive half-wave high-voltage detection of sine wave

[0092] Figure 8-2 Schematic diagram for simulation test of electrostatic detection of moving charged objects - negative half-wave high-voltage detection of sine wave

[0093] Figure 9 Schematic diagram for simulation test of electrostatic detection of moving charged objects - full-wave high-voltage detection of sine wave

[0094] Figure 10-1 Schematic diagram for simulation test of electrostatic detection of moving charged objects - positive half-wave high-voltage detection of sawtooth wave

[0095] Figure 10-2 Schematic diagram for simulation test of electrostatic detection of moving charged objects - negative half-wave high-voltage detection of sawtooth wave

[0096] Figure 10-3 Schematic diagram for simulation test of electrostatic detection of moving charged objects - full-wave high-voltage detection of sawtooth wave

[0097] Figure 11 Schematic diagram for simulation test of electrostatic detection of moving charged objects - distortion diagram of detected voltage

[0098] Figure 12 Schematic diagram for simulation test of electrostatic detection of moving charged objects - delay diagram of detection time

[0099] In the figure: 1 is a rubber roller; 2 is a conveyor belt; 3-1 and 3-2 are moving charged objects; 4, 4-1, 4-2, and 4-3 are electrostatic sensors; 5 is a distance regulator; 6 is a scale; 7 is an insulating bracket; 8-1 is a high-voltage power amplification device; 8-2 is a high-voltage waveform generation device; 9 is a high-voltage probe; 10 is a flat electrode; 11 is a voltage waveform generation device; 12 is an oscilloscope. Detailed implementation method

[0100] The present invention will be further described below in conjunction with the drawings and embodiments.

[0101] The technical solution of the present invention is as follows:

[0102] Analyze the movement and electrification of materials at the production site, summarize, simplify, and conclude to establish a moving electrification model of on-site objects; build a test device according to the moving electrification model; select a test electrification model according to the usage scenario of the electrostatic sensor; use the test device to output a standard voltage waveform and monitor the detected output waveform of the electrostatic sensor; conduct comparative analysis and judgment on the detected output waveform and the standard output waveform, and finally obtain the highest response rate of the electrostatic sensor.

[0103] The overall solution of the technical solution of the present invention is as Figure 1 shown.

[0104] According to the movement and electrification of materials at the application site of the electrostatic sensor, there are usually the following main scenarios:

[0105] 1. The charge amounts (static voltages) of the front and rear objects conveyed on the production line are basically the same, the electrode polarities are the same, and the moving speeds are consistent. At this time, a square wave half-wave signal is output;

[0106] 2. The charge amounts (static voltages) of the front and rear objects conveyed on the production line are basically the same, the electrode polarities are opposite, and the moving speeds are consistent. At this time, a square wave full-wave signal is output;

[0107] 3. The charge amounts (static voltages) of the front and rear objects conveyed on the production line are different, some are high and some are low, the electrode polarities are the same, and the moving speeds are consistent. At this time, a sine half-wave signal is output;

[0108] 4. The charge amounts (static voltages) of the front and rear objects conveyed on the production line are different, some are high and some are low, the electrode polarities are opposite, and the moving speeds are consistent. At this time, a sine full-wave signal is output;

[0109] 5. When the process operation is started and the process speed is continuously increased, the objects conveyed on the production line move from rest to motion, the charge amount gradually increases, and the static voltage gradually increases; subsequently, when the process operation gradually stops and the process speed is continuously decreased, the objects move from motion to rest again, the charge amount gradually decreases, and the static voltage gradually decreases. At this time, a sawtooth wave signal is output.

[0110] The test device is set according to the above-mentioned electrification model: A varying high voltage is applied to an insulating flat electrode, and this high voltage is output by a high-voltage power amplification device; the high-voltage waveform output by this high-voltage power amplification device is generated by a voltage waveform generating device and is transmitted to the high-voltage power amplification device. The selection of this voltage waveform should be made according to the above-mentioned object motion electrification model.

[0111] The amplitude of the waveform signal should be determined according to the amount of static charge (static voltage) on the surface of the object at the application site of the electrostatic sensor.

[0112] The frequency of the waveform signal should be determined according to the following formula:

[0113]

[0114] where f is the frequency of the waveform signal, v is the moving speed of the object on the production line, and s is the distance between two adjacent objects or the distance between two peak static voltages on the object surface (see Figure 2-1 , shown in Figure 2-2).

[0115] The highest response rate / response frequency f of the electrostatic sensor under a certain determined peak voltage U is determined by the above method, that is, under the waveform output with a peak voltage of U and a voltage frequency of f, the peak static voltage V detected by the electrostatic sensor should satisfy:

[0116]

[0117] where U is the peak voltage applied to the flat electrode (see Figure 11 ), and 5% is the allowable error range, which can be set artificially.

[0118] It should also satisfy:

[0119]

[0120] where t τ is the time delay of the peak static voltage detected by the electrostatic sensor compared to the peak of the high-voltage waveform output to the flat electrode (see Figure 12 ), and 5% is the allowable error range, which can be set artificially.

[0121] Satisfying Formulas 2 and 3 means that the electrostatic sensor detects the voltage signal with an output frequency of f and a voltage peak of U without distortion and delay; that is, it means that the electrostatic sensor detects the charged moving object with a moving speed of v and a surface static voltage of U without distortion and delay.

[0122] Figure 3 and Figure 4In addition, the present invention also provides a device for detecting the response rate of an electrostatic sensor. The inventive point lies in:

[0123] A flat electrode 10 is provided to simulate the charged surface of the object to be monitored on-site;

[0124] A voltage waveform generating device 11 ( Figure 3 represented by the high-voltage waveform generating device 8-2 in the figure) is provided to generate and output various types of low-voltage waveforms with adjustable frequencies;

[0125] A high-voltage power amplification device 8-1 is provided to amplify the low-voltage waveform output by the voltage waveform generating device without distortion and output a high-voltage of the same waveform;

[0126] The output end of the high-voltage power amplification device is connected to the flat electrode, and a high-voltage waveform output by the high-voltage power amplification device is applied to the flat electrode;

[0127] A distance regulator 5 is provided above the flat electrode to fix the electrostatic sensor to be measured;

[0128] The electrostatic sensor to be measured is used to detect the static voltage on the flat electrode;

[0129] The distance regulator can adjustably set the detection distance between the electrostatic sensor to be measured and the flat electrode through a corresponding scale 6;

[0130] An oscilloscope 12 is provided. One input end of the oscilloscope is connected to the flat electrode, and the other input end is connected to the signal output end of the electrostatic sensor to be measured, for real-time monitoring of the detected voltage output value of the electrostatic sensor and the standard high-voltage output value of the flat electrode;

[0131] The response frequency of the electrostatic sensor is judged by comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor.

[0132] Further, a high-voltage probe 9 is provided between the flat electrode and the oscilloscope;

[0133] The flat electrode is insulated and fixed through an insulating bracket 7;

[0134] The distance regulator is arranged perpendicular to the flat electrode;

[0135] The low-voltage waveforms generated by the voltage waveform generating device at least include square waves, sine waves or sawtooth waves;

[0136] The voltage waveform generating device 11 can also be connected in series with the high-voltage power amplification device 8-1 in sequence (as Figure 4 shown in the figure), equivalently constituting as Figure 3The high-voltage waveform generating device 8-2 capable of directly outputting various waveforms as shown.

[0137] During actual use, the specific test method of the device for detecting the response rate of the electrostatic sensor is as follows:

[0138] According to the movement and charging conditions of the object, select a standard voltage waveform, start the test device, and first output a relatively low frequency (such as 1 Hz, or determined according to the sampling period of the electrostatic sensor, or determined according to actual needs). At the same time, monitor the standard voltage waveform on the flat electrode and the output voltage waveform detected by the electrostatic sensor, measure the amplitude V of the voltage waveform detected and output by the electrostatic sensor, and compare it with the amplitude U of the standard voltage waveform to determine whether it conforms to Formula 2. If not, reduce the output frequency of the standard voltage and monitor again; if it conforms to Formula 2, then measure whether the time delay of the voltage waveform detected and output by the electrostatic sensor with respect to the standard output voltage waveform conforms to Formula 3. If not, reduce the output frequency of the standard voltage and monitor again; if it conforms to Formula 3, then continue to determine whether the following conditions are simultaneously satisfied:

[0139] 1. When the output frequency of the standard high-voltage waveform is f n , it satisfies: |V - U| / |U| × 100% ≤ 5% and t τn ≤ 1 / f n × 5%;

[0140] 2. When the output frequency of the standard high-voltage waveform is f n+1 (f n+1 > f n ), it satisfies: |V - U| / |U| × 100% > 5% or t τn+1 > 1 / f n+1 × 5%.

[0141] If it cannot be satisfied simultaneously, increase the output frequency of the standard output voltage and monitor again; if it is satisfied simultaneously, the maximum response rate of the electrostatic sensor can be determined as f n , and its test method block diagram is as Figure 5 shown.

[0142] The internal logic of the above test method is to convert the detection of the static voltage on the moving object into the detection of the moving / varying voltage on the fixed object (flat electrode), which corresponds to the static voltage on the object surface, and gradually increase the frequency from a low frequency under a certain high-voltage waveform, so as to test the maximum response frequency of the electrostatic sensor.

[0143] Embodiment:

[0144] The following further describes the specific implementation manner of the technical solution in conjunction with the drawings and embodiments:

[0145] 1. AsFigure 2-1 , 2-2 As shown in 2-2 , during the production processes such as the film tearing operation of the liquid crystal panel, the processing of copper clad laminates, and the slitting and rewinding of films, a large amount of static charges will be carried on the surfaces of products 3-1 and 3-2. They will be placed on the conveyor belt 2 of the assembly line and transported to the next process. To avoid damage caused by electrostatic discharge, it is necessary to monitor and eliminate the static electricity before entering the next process.

[0146] 2. The production environments of various industries and various technological processes will create various complex charged environments. By simplifying and restoring them, it can be considered that the following several charged models mainly exist:

[0147] A. For the same technological operation on the same product, the static charge amount (static voltage) of the front and rear objects is basically the same, the charging polarities are the same, and the moving speeds are consistent;

[0148] B. For the same technological operation on different products, the static charge amount (static voltage) of the front and rear objects is basically the same, the charging polarities are opposite, and the moving speeds are consistent;

[0149] C. For different technological operations on the same product, the static charge amount (static voltage) of the front and rear objects is different, some are high and some are low, the charging polarities are the same, and the moving speeds are consistent;

[0150] D. For different technological operations on different products, the static charge amount (static voltage) of the front and rear objects is different, some are high and some are low, the charging polarities are opposite, and the moving speeds are consistent;

[0151] E. When the technological operation starts and the process speed continuously increases, the object moves from rest to accelerated motion, the static charge amount gradually increases from zero, and the static voltage gradually increases from zero; as the production operation approaches completion, the technological operation gradually stops, the process speed continuously decreases, the object moves from motion to rest, the static charge amount gradually decreases from the maximum, and the static voltage gradually decreases from the maximum.

[0152] 3. Regarding the above production practice situation, refer to Figure 4As shown in the figure, a voltage waveform generating device 11 is provided. This device can generate various types of low-voltage waveforms (with adjustable frequency), such as square waves, sine waves, sawtooth waves, etc. The voltage waveform generating device 11 transmits the output low-voltage waveform to the high-voltage power amplification device 8-1. The high-voltage power amplification device amplifies the input low-voltage waveform without distortion (the voltage waveform after amplification cannot change) and outputs a high voltage of the same waveform. A flat electrode 10 is provided, and the size of its working surface is the same as the size of the charged surface of the object to be monitored on-site. The high-voltage waveform output by the high-voltage power amplification device is applied to this flat electrode, and this flat electrode is insulated and fixed through an insulating bracket 7. The electrostatic sensor 4 is installed and fixed on the distance regulator 5. The distance regulator 5 can set the detection distance through the corresponding scale 6, and this detection distance is the installation distance on-site. An oscilloscope 12 is used to monitor the detected voltage output of the electrostatic sensor and the standard high-voltage output of the flat electrode. The flat electrode 10 and the oscilloscope 12 are connected by a high-voltage probe 9.

[0153] 4. In addition to the above high-voltage waveform generation method, refer to Figure 3 As shown in the figure, a high-voltage generating device 8-2 that can directly output various waveforms can also be used.

[0154] 5. To determine the highest response frequency of the electrostatic sensor, as Figure 5 shown in the figure, according to the movement and charging conditions of the object, select the above 5 standard voltage waveforms, start the test device, and first output a relatively low frequency (such as 1 Hz, or determined according to the sampling period of the electrostatic sensor, or determined according to actual needs). Use the oscilloscope to simultaneously monitor the standard voltage waveform on the flat electrode and the output voltage waveform detected by the electrostatic sensor. Measure the amplitude V of the voltage waveform detected and output by the electrostatic sensor, and compare it with the amplitude U of the standard voltage waveform to determine whether it meets formula 2. If not, reduce the standard voltage output frequency through the waveform generator and monitor again; if it meets formula 2, measure the time delay of the voltage waveform detected and output by the electrostatic sensor with respect to the standard output voltage waveform to determine whether it meets formula 3. If not, reduce the standard voltage output frequency through the waveform generator and monitor again; if it meets formula 3, continue to determine whether the following conditions are simultaneously met:

[0155] 1) When the output frequency of the standard high-voltage waveform is f n , it satisfies: |V - U| / |U|×100% ≤ 5% and t τn ≤ 1 / f n ×5%;

[0156] 2) When the output frequency of the standard high-voltage waveform is f n+1 (f n+1 > f n ), it satisfies: |V - U| / |U|×100% > 5% or tτn+1 > 1 / f n+1 ×5%.

[0157] If the above conditions cannot be satisfied simultaneously, increase the standard output voltage frequency through the waveform generator and conduct monitoring again; if all conditions are satisfied simultaneously, the maximum response rate of the electrostatic sensor can be determined as f n .

[0158] 6. According to the 5 object motion charging models of A - E above, the high - voltage detection waveform that matches them can be selected specifically.

[0159] 7. Combining Figure 2-1 , 2-2 , as shown in Figure 6, A. For the same process operation of the same product, the charge amounts (static voltages) of the front and rear objects are basically the same, the charging polarities are the same, and the moving speeds are consistent; the high - voltage output frequency can be determined according to the production process: where f is the frequency of the high - voltage waveform, v is the moving speed of the object on the production line, and s is the distance between the front and rear objects or the distance between two peak static voltages on the object surface (see Figure 2-1 , 2-2 shown). It is determined that the square - wave half - wave waveform shown in Figure 6 should be used as the high - voltage output waveform for testing the response rate of the electrostatic sensor.

[0160] 8. Combining Figure 2-1 , 2-2 , Figure 7 , as shown in B. For the same process operation of different products, the charge amounts (static voltages) of the front and rear objects are basically the same, the charging polarities are opposite, and the moving speeds are consistent; the high - voltage output frequency can be determined according to the production process: Figure 2-1 where f is the frequency of the high - voltage waveform, v is the moving speed of the object on the production line, and s is the distance between the front and rear objects or the distance between two peak static voltages on the object surface (see 2-2 shown). It is determined that the square - wave full - wave waveform shown in Figure 7 should be used as the high - voltage output waveform for testing the response rate of the electrostatic sensor.

[0161] 9. Combining Figure 2-1 , 2-2 , as shown in Figure 8, C. For different process operations of the same product, the charge amounts (static voltages) of the front and rear objects are different, some are high and some are low, the charging polarities are the same, and the moving speeds are consistent; the high - voltage output frequency can be determined according to the production process: where f is the frequency of the high - voltage waveform, v is the moving speed of the object on the production line, and s is the distance between the front and rear objects or the distance between two peak static voltages on the object surface (see Figure 2-1 , 2-2As shown. Thus, it is determined that the response rate test of the electrostatic sensor should be carried out using the sinusoidal half-wave waveform shown in Figure 8 as the high-voltage output waveform.

[0162] 10. Combining Figure 2-1 , 2-2 , Figure 9 As shown, D. For different process operations of different products, the charge (static voltage) of the front and rear objects is different, high or low, the charging polarities are opposite, and the moving rates are the same; according to the production process, the high-voltage output frequency can be determined: Among them, f is the frequency of the high-voltage waveform, v is the moving rate of the object on the production line, and s is the distance between the front and rear objects or the distance between the two peak static voltages on the object surface (see Figure 2-1 , 2-2 As shown). Thus, it is determined that the response rate test of the electrostatic sensor should be carried out using the Figure 9 sinusoidal full-wave waveform shown as the high-voltage output waveform.

[0163] 11. Combining Figure 2-1 , 2-2 , as shown in Figure 10, E. When the process operation is started and the process speed is continuously increased, the object moves from rest to accelerated motion, the charge gradually increases from zero, and the static voltage gradually increases from zero; as the production operation approaches completion, the process operation gradually stops, the process speed continuously decreases, the object moves from motion to rest, the charge gradually decreases from the maximum, and the static voltage gradually decreases from the maximum; according to the production process, the high-voltage output frequency can be determined: Among them, f is the frequency of the high-voltage waveform, v is the moving rate of the object on the production line, and s is the distance between the front and rear objects or the distance between the two peak static voltages on the object surface (see Figure 2-1 , 2-2 As shown). Thus, it is determined that the response rate test of the electrostatic sensor should be carried out using the sawtooth waveform shown in Figure 10 as the high-voltage output waveform.

[0164] 12. Referring to Figure 11 , when determining the maximum response rate / response frequency f of the electrostatic sensor by the above method, the peak voltage U of the high-voltage waveform applied on the flat electrode corresponds to the surface static voltage value of the moving charged object; to accurately determine the maximum response rate, the static voltage value V detected by the electrostatic sensor for the flat electrode should satisfy:

[0165]

[0166] Among them, 5% is the allowable error range, which can be set artificially.

[0167] 13. Referring to Figure 12 , the high-voltage waveform output on the flat electrode must precede the detection output of the electrostatic sensor, and its detection time delay should satisfy:

[0168]

[0169] wherein, t τ is the time delay of the peak static voltage detected by the static electricity sensor compared to the peak value of the high-voltage waveform, and 5% is the allowable error range, which can be set artificially.

[0170] Satisfying the above two equations means that the static electricity sensor has detected the voltage signal with an output frequency of f and a high-voltage peak of U without distortion and delay; that is, it means that the static electricity sensor has detected the moving charged object with a moving speed of v and a surface static voltage of U without distortion and delay.

[0171] The technical solution of the present invention provides a method and device for measuring the response rate of a static voltage detection instrument for detecting a moving charged object or an object with real-time changes in static electricity quantity and polarity. It provides an effective method for the static electricity sensor to specifically monitor objects with specific movements and specific charged conditions; the method of judging the response frequency of the static electricity sensor by comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor only needs to monitor the time values at the peak values of the two waveforms and perform simple addition and subtraction operations to draw a conclusion, eliminating complex programming operations, being simple, convenient and highly reliable; the implementation of the technical solution of the present invention is conducive to establishing a standardized static electricity detection test method.

[0172] The present invention can be widely used in the fields of detecting the response rate of static electricity sensor products and quality evaluation.

Claims

1. A method for detecting the response rate of an electrostatic sensor, characterized in that Including the following steps: 1.1) Analyze the movement and electrification of materials at the production site; 1.2) Establish a movement electrification model of on-site objects; 1.3) Build a test device according to the movement electrification model; 1.4) Select a test electrification model according to the usage scenario of the electrostatic sensor; 1.5) Start the test device and output a standard voltage waveform corresponding to the selected test electrification model; 1.6) Monitor the detected output waveform of the electrostatic sensor; 1.7) Compare, analyze and judge the detected output waveform of the electrostatic sensor and the standard voltage output waveform in real time; 1.8) Obtain the highest response rate of the electrostatic sensor; Among them, the test device includes a voltage waveform generating device for generating low-voltage waveforms of various types and adjustable frequencies; the voltage waveform generating device transmits the output low-voltage waveform to a high-voltage power amplification device, and the high-voltage power amplification device amplifies the input low-voltage waveform without distortion and outputs a high-voltage of the same waveform; A flat electrode is provided, and the size of its use surface is the same as the size of the charged surface of the object to be monitored on-site; the high-voltage waveform output by the high-voltage power amplification device is applied to this flat electrode; The electrostatic sensor is installed and fixed on a distance regulator, and the distance regulator can set the detection distance through a scale corresponding to it, and this detection distance is the on-site installation distance; Use an oscilloscope to monitor the detected voltage output of the electrostatic sensor and the standard high-voltage output of the flat electrode; The method for detecting the response rate of the electrostatic sensor simulates a charged object moving rapidly and an object with rapidly changing charge quantity and polarity during the actual production process, and judges the response frequency of the electrostatic sensor by comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor; only the time values at the peaks of the two waveforms need to be monitored and simple addition and subtraction operations can be performed to draw a conclusion.

2. The method for detecting the response rate of the electrostatic sensor according to claim 1, characterized in that The movement and electrification of materials at the production site, the movement electrification model or the test electrification model include: 2.1) For the same process operation of the same product, the charge quantity or static voltage of the objects before and after transmission is basically the same, the charging polarity is the same, and the moving speed is consistent; at this time, the test electrification model adopts a square wave half-wave signal output; 2.2) For the same process operation of different products, the charge quantity or static voltage of the objects before and after is basically the same, the charging polarities are opposite, and the moving speed is consistent; at this time, the test electrification model adopts a square wave full-wave signal output; 2.3) For different process operations of the same product, the charge quantity or static voltage of the objects before and after is different, some are high and some are low, the charging polarity is the same, and the moving speed is consistent; at this time, the test electrification model adopts a sine half-wave signal output; 2.4) For different process operations of different products, the charge quantity or static voltage of the objects before and after is different, some are high and some are low, the charging polarities are opposite, and the moving speed is consistent; at this time, the test electrification model adopts a sine full-wave signal output; 2.5) The process operation starts, and the process speed continuously increases. The object accelerates from rest, and its charge gradually increases from zero, while the static voltage gradually increases from zero. As the production operation approaches completion, the process operation gradually stops, and the process speed continuously decreases. The object decelerates from motion to rest, and its charge gradually decreases from the maximum, while the static voltage gradually decreases from the maximum. At this time, the test charging model uses a sawtooth wave signal output.

3. The method for detecting the response rate of an electrostatic sensor according to claim 1, characterized in that The standard voltage waveform described above includes at least a square wave, a sine wave, or a sawtooth wave.

4. The method for detecting the response rate of an electrostatic sensor according to claim 1, characterized in that The low voltage waveform described above includes at least a square wave, a sine wave, or a sawtooth wave.

5. The method for detecting the response rate of an electrostatic sensor according to claim 1, wherein The amplitude of the high voltage output by the high voltage power amplifier should be determined according to the static charge or static voltage on the surface of the object at the application site of the electrostatic sensor. The frequency of the high voltage output by the high voltage power amplifier should be determined according to the following formula: where f is the frequency of the waveform signal, v is the moving speed of the object on the production line, and s is the distance between two adjacent objects or the distance between two peak static voltages on the object surface.

6. The method for detecting the response rate of an electrostatic sensor according to claim 1, characterized in that When the electrostatic sensor outputs a waveform with a peak voltage of U and a voltage frequency of f, the peak static voltage V detected by the electrostatic sensor should satisfy: where U is the peak voltage applied on the flat electrode, and 5% is the allowable error range. The electrostatic sensor described above should also satisfy: where t τ is the time delay of the peak value of the static voltage detected by the static electricity sensor compared to the peak value of the high-voltage waveform output to the flat electrode, and 5% is the allowable error range; If the electrostatic sensor satisfies the above two conditions simultaneously, and also satisfies the following conditions: 1) When the output frequency of the standard high-voltage waveform is f n , it satisfies: |V - U| / |U| × 100% ≤ 5% and t τn ≤ 1 / f n × 5%; 2) When the output frequency of the standard high-voltage waveform is f n+1 (f n+1 > f n ), it satisfies: |V - U| / |U| × 100% > 5% or t τn+1 > 1 / f n+1 × 5%; Then the maximum response rate of the electrostatic sensor can be determined as f n .

7. The method for detecting the response rate of an electrostatic sensor according to claim 1, characterized in that The method for detecting the response rate of the electrostatic sensor realizes the simulation test of moving objects with the same charge and the same polarity and the same moving speed before and after by using the standard voltage waveform output of a square wave half-wave high voltage signal. The simulation test of moving objects with the same charge but opposite polarities and the same moving speed before and after is realized by using the standard voltage waveform output of a square wave full-wave high voltage signal. The simulation test of moving objects with different charges and the same polarity and the same moving speed before and after is realized by using the standard voltage waveform output of a sine wave half-wave high voltage signal. The simulation test of moving objects with different charges but opposite polarities and the same moving speed before and after is realized by using the standard voltage waveform output of a sine wave full-wave high voltage signal. The simulation test of moving objects with the process speed continuously increasing, the object accelerating from rest to motion, the charge gradually increasing, and the static voltage gradually increasing; then, the process operation gradually stops, the process speed continuously decreases, the object decelerating from motion to rest, the charge gradually decreasing, and the static voltage gradually decreasing is realized by using the standard voltage waveform output of a sawtooth wave high voltage signal.

8. A device for detecting the response rate of an electrostatic sensor, characterized in that: A flat electrode is provided to simulate the charged surface of the object to be monitored on site. A voltage waveform generating device is provided to generate and output various types of low voltage waveforms with adjustable frequencies. A high voltage power amplifier is provided to amplify the low voltage waveform output by the voltage waveform generating device without distortion and output a high voltage of the same waveform. The output end of the high voltage power amplifier is connected to the flat electrode, and the high voltage waveform output by the high voltage power amplifier is applied to the flat electrode. A distance regulator is provided above the flat electrode for movably fixing the electrostatic sensor to be measured for detecting the static voltage on the flat electrode; The distance regulator sets the detection distance of the electrostatic sensor to be measured through a corresponding scale; An oscilloscope is provided. One input end of the oscilloscope is connected to the flat electrode, and the other input end is connected to the signal output end of the electrostatic sensor to be measured for real-time monitoring of the detection voltage output value of the electrostatic sensor and the standard high-voltage output value of the flat electrode; The response frequency of the electrostatic sensor is judged by comparing the phase delay between the standard voltage waveform and the voltage waveform detected and output by the sensor.

9. The device for detecting the response rate of the electrostatic sensor according to claim 8, characterized in that a high-voltage probe is provided between the flat electrode and the oscilloscope; The flat electrode is insulatively fixed through an insulating bracket; The low-voltage waveform generated by the voltage waveform generating device at least includes a square wave, a sine wave or a sawtooth wave; The voltage waveform generating device and the high-voltage power amplification device are connected in series in sequence to form a high-voltage waveform generating device, and the output end of the high-voltage waveform generating device is electrically connected to the flat electrode.

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