Electrical detection method and detection system for actuation jitter of armature of alternating-current relay

Abstract

The invention provides an electrical detection method and detection system for actuation jitter of an armature of an alternating-current relay. The electrical detection method comprises the following steps: collecting a current signal of a to-be-detected alternating-current relay; conditioning and converting the collected current signal; comparing and analyzing the converted signal with a preset value, wherein the preset value is a coil current parameter when the armature of the alternating-current relay is normally closed; according to the scheme, the detection speed is high, armature shaking abnormal sound detection of a single driving voltage point of a product can be completed within 100 ms, and the detection speed is more than 10 times that of a traditional detection method. Compared with an existing noise audio test method that jitter abnormity can be judged only by collecting a continuous audio signal, the test efficiency is improved by more than 500%; the alternating-current relay armature pull-in vibration noise electrical test method in the scheme is irrelevant to external noise, noise interference of the external environment is completely avoided, manual action interference is also completely avoided, and the test result is stable and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of AC relay detection, and particularly to an electrical detection method and detection system for the armature suction jitter of an AC relay. Background Art

[0002] During the production process of an AC relay, variations in the assembly process or problems with the incoming material quality can cause issues such as uneven iron core suction surfaces, non-parallel and non-tight contact between the iron core and the armature, excessive spring tension, deformation of the moving contact spring piece, and displacement and deformation of the static contact bracket. These problems can lead to unstable armature suction and generate jitter and abnormal noise.

[0003] Unstable armature suction or jitter of an AC relay can cause abnormal heating of the coil, as well as jitter in the contact between the connected contacts or non-parallel contact surfaces between the moving and static contacts, resulting in a reduction in the effective contact area. As a result, serious faults such as overheating and burning of the AC relay coil, reduction in the contact load power, and even contact arcing and welding may occur during use. Therefore, detecting the jitter and abnormal noise of the armature suction during the production process of an AC relay is a very important and indispensable quality inspection link.

[0004] In the current field of AC relay manufacturing technology, there are two methods for detecting such jitter and abnormal noise: one is the abnormal noise audio detection method. An expensive soundproof room is set up, and there is an adjustable AC power supply in the soundproof room. By manually operating to switch multiple power supply voltage points and relying on human ear hearing to judge, the determination of product quality is completely subjectively judged by human ear hearing. Or the product is placed in a shielding box and a noise is collected using an electronic pickup to make a judgment. The other is the detection method of the level change of the moving and static contacts of the AC relay to determine whether the contacts are jittering.

[0005] The existing detection methods for the armature suction jitter of AC relays have many drawbacks: for the audio detection method, an independent and expensive soundproof room or shielding and soundproof box is required. This method requires collecting audio for at least 2 seconds or more for comparison to determine the result. Subjectively judging with human ear hearing has low detection accuracy and precision, is easily interfered by external noise, has low test efficiency, high equipment costs, and a large labor intensity for manual operation.

[0006] For the detection method of the level change of the moving and static contacts, this method can only detect the situation where the contact separation jitter is caused by abnormal jitter, and has great limitations. It is powerless for abnormal situations such as abnormal overcurrent heating of the coil caused by armature jitter, the armature jitter but the contacts have been suctioned and contacted, or the contact surface is non-parallel due to armature jitter, resulting in a reduction in the effective contact area. Summary of the Invention

[0007] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide an electrical detection method and detection system for the jitter of the armature suction of an AC relay, so as to solve the problems of low detection efficiency and low detection accuracy existing in the existing detection means for the armature of an AC relay.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows: In the first aspect, the present application provides an electrical detection method for the jitter of the armature suction of an AC relay, including: Collecting the current signal of the AC relay to be detected; Conditioning and converting the collected current signal; Comparing and analyzing the converted signal with a preset value, where the preset value is the coil current parameter when the armature of the AC relay is normally attracted.

[0009] Further, the preset value is the action cycle time and the voltage amplitude of the coil current variable signal when the armature of the AC relay is normally attracted.

[0010] Further, the action cycle time when the armature of the AC relay is normally attracted is within 30 ms, and the voltage amplitude of the coil current variable signal is ±2V.

[0011] Further, the collected current signal is converted into a voltage signal, and the converted voltage signal is subjected to shaping filtering and analog-to-digital A / D conversion before being analyzed and compared.

[0012] Further, when the value of the collected and converted signal does not exceed the preset value, it is determined that the AC relay to be detected is qualified; otherwise, it is determined to be unqualified.

[0013] In the second aspect, the embodiments of the present application further provide a detection system for implementing the electrical detection method for the jitter of the armature suction of an AC relay as described above, including: A current variable signal acquisition circuit module, one end of the current variable signal acquisition circuit module is connected to the power supply terminal of the AC relay to be detected, and the other end of the current variable signal acquisition circuit module is connected to the coil of the AC relay to be detected; A signal shaping circuit module, the signal shaping circuit module is connected to the output end of the current variable signal acquisition circuit module; An analysis and comparison processing module, the analysis and comparison signal processing module is connected to the output end of the signal shaping circuit module, and the analysis and comparison processing module is used to compare and analyze the shaped signal with the preset value.

[0014] Further, an oscilloscope module is arranged between the signal shaping circuit module and the analysis and comparison processing module, and the oscilloscope module detects and collects the signal output by the signal shaping circuit module.

[0015] The beneficial effects of the present invention are as follows: 1. The detection speed of this solution is fast, and the detection of the armature jitter abnormal sound at a single driving voltage point of the product can be completed within 100 ms, which is more than 10 times the detection speed of the traditional detection method. Compared with the existing noise audio test method that requires collecting a continuous audio signal to compare and judge the jitter abnormality, the test efficiency is increased by more than 500%; 2. The electrical test method for the armature suction vibration noise of the AC relay in this solution has nothing to do with external noise, completely avoids the noise interference of the external environment, and also completely avoids the interference of human actions. The test results are stable and accurate; 3. The electrical test method for the armature suction vibration noise of the AC relay in this solution can accurately capture the signal of each vibration of the armature, and can quickly detect the instantaneous jitter, intermittent jitter and continuous jitter of the armature during suction, greatly improving the test accuracy and precision; 4. The detection method in this solution can replace the investment in expensive equipment such as a silent room / shielding box / high-sensitivity microphone in the existing detection method; 5. By detecting the current variable to judge the armature jitter abnormal sound situation, great breakthroughs have been made in the test accuracy, precision and test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic flow chart of the electrical detection method for the armature suction jitter of the AC relay in the embodiment of the present application.

[0017] Figure 2 It is a schematic structural principle diagram of the detection system in the embodiment of the present application.

[0018] Figure 3 It is a waveform diagram of the coil current when the armature of the normal AC relay in the embodiment of the present application is normally sucked.

[0019] Figure 4 It is a waveform diagram of the coil current when the armature of the AC relay in the embodiment of the present application makes an abnormal sound during the instantaneous suction.

[0020] Figure 5 It is a waveform diagram of the coil current when the armature of the AC relay in the embodiment of the present application makes a continuous abnormal sound during the suction.

[0021] Figure 6 It is a schematic diagram of the test result of the qualified AC relay armature suction jitter in the embodiment of the present application.

[0022] Figure 7 It is a schematic diagram of the test result of the unqualified AC relay armature suction jitter in the embodiment of the present application (abnormal jitter in the suction action cycle).

[0023] Figure 8Schematic diagram of the test result of the unqualified AC relay armature sucking and jittering (abnormal continuous jitter during sucking).

[0024] In the figure: 10 - Detection system; 100 - Current variable signal acquisition circuit module; 200 - Signal shaping circuit module; 300 - Oscilloscope module; 400 - Analysis and comparison processing module. Specific implementation mode

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings of the specification and the specific implementation mode.

[0026] See the attached Figure 1 As shown, this embodiment provides an electrical detection method for the sucking jitter of the AC relay armature, including the following steps: S1. Collect the current signal of the AC relay to be detected; Apply a voltage with a corresponding specified frequency to the AC power supply terminal of the AC relay to be detected, from 0 to the rated value. When the relay armature sucks, the change in the magnetic circuit reluctance caused by the change in the magnetic circuit length will present a change signal of the current, and it will only stabilize when the armature is completely sucked. When the armature jitters, its current signal will also present a changing signal, and this changing signal is collected.

[0027] S2. Condition and convert the collected current signal; Process and convert the signal collected in step S1 above. For example, convert the collected current signal into a voltage signal, and filter out the spike interference clutter and perform analog-to-digital A / D conversion on the converted voltage signal to facilitate subsequent signal processing and analysis.

[0028] S3. Compare and analyze the converted signal with a preset value, where the preset value is the coil current parameter when the AC relay armature normally sucks; For example, according to the pre-set current variable (voltage signal) specification value corresponding to the product model and the current variable (voltage signal) change curve, automatically compare and judge the situation of the armature jitter and abnormal sound.

[0029] In this embodiment, the preset values are the action cycle time and the voltage amplitude of the coil current variable signal when the AC relay armature normally sucks. For example, the action cycle time when the AC relay armature normally sucks is within 30 ms, and the voltage amplitude of the coil current variable signal is ±2V.

[0030] After setting the preset value, analyze and judge the collected signal. When the value of the collected and converted signal does not exceed the preset value, it is judged that the AC relay to be detected is qualified; otherwise, it is judged as unqualified.

[0031] In order to verify the data of the armature of the AC relay under three different states: normal closing, abnormal noise at the moment of closing, and continuous abnormal noise during closing, an oscilloscope can be equipped (for example, one Keysight DSO-X3012A oscilloscope made in Germany, or an oscilloscope with a sampling rate of more than 5MS / S can be used). Among them, the normal closing of the armature of the AC relay means that the function of the AC relay is normal and there is no abnormal noise when it is energized and closed; the abnormal noise at the moment of closing of the armature of the AC relay means that the AC relay can be closed when energized, but there is an abnormal noise at the moment of closing; the continuous abnormal noise during closing of the armature of the AC relay means that the AC relay cannot be normally closed when energized and emits a continuous "click" noise.

[0032] Refer to the appendix Figure 3 As shown, it is the current waveform diagram of the coil when the armature of the AC relay closes normally. It can be intuitively judged that the amplitude of the stable coil current variable voltage signal after the AC relay closes is 24.25V, and the armature closing action time is 20ms. Generally, the acceptable power-on closing action time of the relay armature is within 30ms. During the armature closing action, the amplitude of the coil current variable voltage signal is much larger than the stable value of 24.25V after closing. The waveform data of the amplitude of the coil current variable voltage signal in the above figure shows that the closing action duration of the armature of a normal product is within the cycle time specification (within 30ms). After closing, the amplitude of the coil current variable voltage signal is stable within the product specification.

[0033] Refer to the appendix Figure 4 As shown, it is the current waveform diagram of the coil when there is abnormal noise at the moment of closing of the armature of the AC relay. In this figure, the electric closing action time of the coil of this AC relay exceeds that of a normal product, and an abnormal jitter noise is emitted instantaneously for a long time. From the waveform of the coil current variable (voltage signal), it can be intuitively judged that the armature closing action time of this AC relay is as long as 163ms, far exceeding the normal value of 30ms, and the amplitude of the coil current variable voltage signal is as high as 115V, much larger than the stable value of 24.25V after closing.

[0034] Refer to the appendix Figure 5 As shown, it is the current waveform diagram of the coil when there is continuous abnormal noise during closing of the armature of the AC relay. After the relay is powered on, it continuously emits an abnormal jitter noise for a long time and cannot be normally closed. From the waveform of the coil current variable (voltage signal), it can be intuitively judged that the armature of this AC relay is in a continuous closing and jitter state, and the amplitude of the coil current variable voltage signal remains at about 60V continuously, much larger than the stable value of 24.25V after closing.

[0035] Refer to the appendixFigure 6 As shown, it is a schematic diagram of the test result of the armature suction jitter of a qualified AC relay. It can be seen from this figure that the action cycle of the armature suction action is 25 ms (75 ms - 50 ms), which is within the preset 30 ms; the voltage amplitude of the coil current variable signal is between +2V and -2V, also within the preset voltage amplitude range. Therefore, the test result at this time shows as qualified (PASS, which means passed).

[0036] Refer to the appendix Figure 7 As shown, it is a schematic diagram of the test result of the armature suction jitter of an unqualified AC relay (abnormal jitter in the suction action cycle). It can be seen from this figure that the action cycle of the armature suction action is 75 ms (100 ms - 25 ms), exceeding the preset 30 ms. Therefore, the test result at this time shows as unqualified (FALL, which means not passed).

[0037] Refer to the appendix Figure 8 As shown, it is a schematic diagram of the test result of the armature suction jitter of an unqualified AC relay (abnormal continuous jitter during suction). It can be seen from this figure that the action cycle of the armature suction action is 25 ms (75 ms - 50 ms), which is within the preset 30 ms, but the voltage amplitude of the coil current variable signal is between +4V and -4V, exceeding the preset voltage amplitude range. Therefore, the test result at this time shows as unqualified (FALL, which means not passed).

[0038] Refer to the appendix Figure 2 As shown, this embodiment also provides a detection system 10 for implementing an electrical detection method for the armature suction jitter of an AC relay. The detection system 10 includes a current variable signal acquisition circuit module 100, a signal shaping circuit module 200, an oscilloscope module 300, and an analysis and comparison processing module 400.

[0039] One end of the current variable signal acquisition circuit module 100 is connected to the power supply terminal of the AC relay to be detected, and the other end of the current variable signal acquisition circuit module 100 is connected to the coil of the AC relay to be detected. The signal shaping circuit module 200 is connected to the output end of the current variable signal acquisition circuit module 100, filters out spike interference clutter, and after conditioning the voltage signal, outputs it to the backend oscilloscope module 300 for detection and acquisition, and after performing analog-to-digital (A / D) conversion, it is sent to the analysis and comparison processing module 400. The analysis and comparison processing module 400 is used to compare and analyze the shaped signal with a preset value.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A method for detecting electrical properties of armature pull-in vibration of an AC relay, characterized in that: include: Collect the current signal of the AC relay to be detected; Conditioning and converting the collected current signal; The converted signal is compared and analyzed with the preset value, wherein the preset value is the coil current parameter when the armature of the AC relay is normally attracted.

2. The electrical detection method of the AC relay armature pull-in jitter according to claim 1 is characterized in that: The preset values ​​are the action cycle time when the AC relay armature is normally attracted and the voltage amplitude of the coil current variable signal.

3. The electrical detection method of the AC relay armature pull-in jitter according to claim 2 is characterized in that: The action cycle time of the AC relay armature when normally attracted is within 30ms, and the voltage amplitude of the coil current variable signal is plus or minus 2V.

4. The electrical detection method of the AC relay armature pull-in jitter according to claim 1 is characterized in that: The collected current signal is converted into a voltage signal, and the converted voltage signal is subjected to shaping filtering and digital-to-analog A / D conversion before analysis and comparison.

5. The electrical detection method of AC relay armature pull-in jitter according to claim 3 is characterized in that: When the signal value after the acquisition conversion does not exceed the preset value, the AC relay to be detected is judged to be qualified, otherwise it is judged to be unqualified.

6. A detection system for implementing the electrical detection method of the AC relay armature pull-in jitter as described in any one of claims 1 to 5, characterized in that: include: A current variable signal acquisition circuit module, one end of which is connected to the power supply end of the AC relay to be detected, and the other end of which is connected to the coil of the AC relay to be detected; A signal shaping circuit module, wherein the signal shaping circuit module is connected to an output end of the current variable signal acquisition circuit module; An analysis and comparison processing module, wherein the analysis and comparison signal processing module is connected to the output end of the signal shaping circuit module, and the analysis and comparison processing module is used to compare and analyze the shaped signal with a preset value.

7. A detection system according to claim 6, characterized in that: It also includes an oscilloscope module, which is arranged between the signal shaping circuit module and the analysis and comparison processing module, and detects and collects the signal output by the signal shaping circuit module.

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