CN220137067U - Detection device for bottom of capacitor drum - Google Patents
Detection device for bottom of capacitor drum Download PDFInfo
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- CN220137067U CN220137067U CN202320630679.7U CN202320630679U CN220137067U CN 220137067 U CN220137067 U CN 220137067U CN 202320630679 U CN202320630679 U CN 202320630679U CN 220137067 U CN220137067 U CN 220137067U
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- 239000003990 capacitor Substances 0.000 title claims abstract description 136
- 238000001514 detection method Methods 0.000 title claims abstract description 68
- 230000010355 oscillation Effects 0.000 claims abstract description 54
- 230000006698 induction Effects 0.000 claims abstract description 40
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 35
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model provides a detection device for a capacitor drum bottom, wherein the detection device comprises: the electromagnetic induction signal generation module is provided with an induction coil and is used for radiating electromagnetic oscillation signals, when the distance between the detected capacitor and the induction coil is shortened, the electromagnetic oscillation signals radiated by the induction coil are changed based on the eddy current effect, the detection module is connected with the electromagnetic induction signal generation module and is used for acquiring first electromagnetic oscillation signals radiated by the electromagnetic induction signal generation module when the capacitor is not close to the induction coil, and second electromagnetic oscillation signals radiated by the electromagnetic induction signal generation module when the detected capacitor is close to the preset position of the induction coil, and the change degree of the first electromagnetic oscillation signals relative to the second electromagnetic oscillation signals is compared to determine whether the drum bottom of the detected capacitor appears. The device can improve the detection precision of the bottom of the capacitor drum and reduce the detection cost.
Description
Technical Field
The embodiment of the utility model relates to the technical field of electronic circuits, in particular to a detection device for a capacitor drum bottom.
Background
In the aging process of the aluminum electrolytic capacitor, electrolyte boils due to internal burrs of the capacitor flashing or overlarge charging current and the like, and the boiling electrolyte enables the pressure in the aluminum shell to be overlarge so as to enable the explosion-proof valve to be opened or bulge, so that the bottom of the capacitor is bulged.
The method for detecting the bottom of the capacitor drum in the prior art comprises the steps of detecting the change of the bottom of the capacitor through an optical fiber sensor, a visual sensor, a laser sensor and the like, wherein the detection accuracy is not high in the detection mode, and the detection cannot be performed on the slight bottom of the drum.
Disclosure of Invention
The embodiment of the utility model provides a detection device for a capacitor drum bottom, which can improve the detection precision of the capacitor drum bottom.
In one aspect, an embodiment of the present utility model provides a device for detecting a bottom of a capacitor drum, including:
an electromagnetic induction signal generating module with an induction coil, which is used for radiating electromagnetic oscillation signals, and when the distance between a detected capacitor and the induction coil is shortened, the electromagnetic oscillation signals radiated by the induction coil are changed based on the eddy current effect;
the detection module is connected with the electromagnetic induction signal generation module and is used for acquiring a first electromagnetic oscillation signal radiated by the electromagnetic induction signal generation module when the capacitor is not close to the detection module, and comparing a second electromagnetic oscillation signal radiated by the electromagnetic induction signal generation module when the detected capacitor is close to the preset position of the induction coil, and comparing the change degree of the first electromagnetic oscillation signal relative to the second electromagnetic oscillation signal so as to determine whether the detected capacitor has a drum bottom.
As can be seen from the above embodiment of the present utility model, the detection device for the bottom of the capacitor drum includes an electromagnetic induction signal generating module of an induction coil and a detection module connected to the electromagnetic induction signal generating module, where the electromagnetic induction signal generating module is configured to radiate an electromagnetic oscillation signal, and when a detection distance between the induction coil and the capacitor to be detected is reached, generate a second electromagnetic oscillation signal, and the detection module is configured to obtain the second electromagnetic oscillation signal, compare the second electromagnetic oscillation signal with the first electromagnetic oscillation signal, and determine, according to a comparison result, whether a current distance between the induction coil and the bottom of the capacitor to be detected is smaller than the detection distance, if so, it indicates that the capacitor to be detected has a bottom of the drum, and by detecting a change in signal in the electromagnetic induction signal generating module caused by the eddy current effect, determine whether the capacitor has a bottom of the drum.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the utility model and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a detection scenario of a detection device for a bottom of a capacitor drum according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a device for detecting a bottom of a capacitor drum according to an embodiment of the present utility model;
fig. 3 is a schematic circuit diagram of a device for detecting a bottom of a capacitor drum according to an embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of a device for detecting a bottom of a capacitor drum according to another embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
According to faraday electromagnetic induction principle, when a block-shaped metal conductor is placed in a changing magnetic field or moves in the magnetic field to cut magnetic force lines, induced current in a vortex shape is generated in the conductor, and the current is called an eddy current, and the phenomenon is called an eddy current effect.
The principle of eddy current effect measurement is that if a metal plate is placed in the vicinity of an induction coil, which are at a distance from each other, an alternating magnetic flux is generated when an alternating current is supplied to the induction coil, and an induced current is generated in the alternating magnetic field by the metal plate, which is closed in the metal body. I.e. the eddy current, the size of which is related to the parameters of resistivity, permeability, thickness of the metal plate, distance between the metal plate and the inductor, angular frequency of the excitation current, etc., if certain parameters are fixed, another parameter can be measured according to the eddy current change. Therefore, by utilizing the principle, the utility model can calculate whether the detected capacitor has a drum bottom or not by fixing other parameters and measuring the distance between the metal plate and the inductance coil.
The embodiment of the utility model provides a detection device for detecting whether a capacitor with a conductive material shell is at the bottom of the drum, such as an aluminum electrolytic capacitor, as shown in fig. 1, the detection device 10 for detecting the bottom of the drum of the capacitor comprises an induction coil 11, and when detecting whether the capacitor 20 is at the bottom of the drum, the detection device 10 is close to the capacitor 20 to be detected, so that a preset detection distance is reached between the induction coil 11 and the bottom of the capacitor 20 to be detected.
Referring to fig. 2, the detection apparatus includes: an electromagnetic induction signal generating module 12 having an induction coil 11 and a detecting module 13 connected to the electromagnetic induction signal generating module 12;
the electromagnetic induction signal generating module 12 is configured to radiate an electromagnetic oscillation signal, and when the distance between the capacitor to be detected and the induction coil 11 becomes closer, the electromagnetic oscillation signal radiated by the induction coil 11 is changed based on the eddy current effect.
In this embodiment, the capacitor to be detected has a metal plate made of aluminum or other metal materials, and when the capacitor to be detected approaches to the inductor coil to a certain distance, an alternating magnetic flux is generated based on an alternating current input by the inductor coil, and an eddy current is generated in the alternating magnetic field by the metal plate, that is, an eddy current effect occurs between the metal plate of the capacitor to be detected and the inductor coil.
The detection module 13 is configured to obtain a first electromagnetic oscillation signal radiated by the electromagnetic induction signal generating module 12 when the capacitor is not close, and a second electromagnetic oscillation signal radiated by the electromagnetic induction signal generating module 12 when the detected capacitor is close to the preset position of the induction coil, and compare the variation degree of the first electromagnetic oscillation signal relative to the second electromagnetic oscillation signal to determine whether the detected capacitor has a drum bottom.
If the change degree of the first electromagnetic oscillation signal relative to the second electromagnetic oscillation signal is larger than a threshold value, the distance between the induction coil and the bottom of the detected capacitor is smaller than a preset detection distance, and the detected capacitor is at the bottom of the drum.
Wherein the degree of variation includes a degree of variation in frequency and a degree of variation in amplitude.
Specifically, the detection device can judge whether the capacitor is at the bottom of the drum or not in two different modes of frequency modulation and amplitude modulation through the electromagnetic induction signal generation module and the detection module. Correspondingly, the electromagnetic induction signal generating module 12 may have the following two structures, and the electromagnetic induction signal generating module 12 has different structures, and the content of the first electromagnetic oscillation signal and the second electromagnetic oscillation signal compared by the detecting module 13 is different, and may be divided into a frequency value and an amplitude value for comparing the two signals.
Exemplified by frequency modulationThe first electromagnetic oscillating signal is generated by an oscillator, which is connected in parallel with an inductance coil, and the inductance coil is connected in parallel with a capacitor to form an LC oscillator, so that a resonant sine wave with the same fixed frequency can be generated based on the oscillating waveform. When being covered withWhen the detection capacitor is close to the inductance coil, the distance between the inductance coil and the bottom of the detected capacitor is changed, and the inductance L of the inductance coil is also changed, so that the output frequency of the LC oscillator is changed. When the distance between the capacitor to be detected without the drum bottom and the inductance coil is set as the detection distance, the resonance frequency generated by the oscillation waveform is set as the initial frequency. When the detected capacitor is at the bottom of the drum, the relative distance between the detected capacitor and the inductance coil is changed, so that the resonant frequency is changed, the frequency of the electromagnetic induction signal generated by the detection module after the change is radiated by the detection module is different from the initial frequency, and when the frequency difference is greater than a preset frequency threshold value, the bottom of the drum can be judged to be at the bottom of the detected capacitor.
Specifically, the electromagnetic induction signal generation module 12 includes: a first oscillator and a second oscillator including the induction coil;
the first oscillator is used for generating a square wave signal with a preset fixed frequency and transmitting the square wave signal to the second oscillator, the second oscillator is used for transmitting the square wave signal to the first oscillator after oscillating the square wave signal into sine waves, and the output end of the first oscillator is connected with the detection module 13.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of the detection device 10. The first oscillator comprises a counter U1, a first resistor R6, a second resistor R16, a first capacitor C14 and a second capacitor C25;
the counter U1 is specifically a binary counter, and the U1 is connected with the first end of the first resistor R6 through an RTC pin and connected with the first end of the second resistor R16 through a CTC pin.
The second end of the first resistor R6 is connected with the first end of the first capacitor C14; the second terminal of the second resistor R16 is connected to the first terminal of the second capacitor C25. The clock input pin RS of U1 is connected to the second terminal of the first resistor R6.
The second oscillator further comprises a third capacitor C10; the third capacitor C10 is connected in parallel with the induction coil 11, and one end of the third capacitor C10 is connected to the reset end MR of the counter U1, and the other end of the third capacitor C10 is connected to the second end of the first capacitor C14 and the second end of the second capacitor C25.
The detection module 13 is further configured to compare the frequency difference between the second electromagnetic oscillation signal and the first electromagnetic oscillation signal, and if the frequency difference is greater than a preset frequency threshold, confirm that the current distance between the induction coil 11 and the detected capacitor 20 is smaller than the detection distance.
The detection module 13 comprises a singlechip or a programmable logic controller (PLC, programmable Logic Controller); the singlechip or the PLC is connected with a Q11 pin of the counter U1.
The principle of operation of the circuit shown in fig. 3:
u1, R6, R16, C14 and C25 form an oscillator, which generates a square wave of fixed frequency, i.e. a first electromagnetic oscillating signal. U1 is a 14 bit binary counter, pin 11 of U1 (i.e., the RS pin in fig. 3) is the clock input pin, and pin 9 (i.e., the CTC pin in fig. 3) and pin 10 (i.e., the RTC pin in fig. 3) are the clock generation pins. The square wave forms a sine wave with the fixed frequency through an LC oscillator formed by the inductance coil 11 and the C10, the sine wave is input to U1 after passing through the C14, the U1 is used as a second electromagnetic oscillation signal after reducing the frequency of the sine wave through frequency division, the frequency of the second electromagnetic oscillation signal is compared with the fixed frequency of the first electromagnetic oscillation signal after being obtained by the detection module, if the frequency difference value obtained by the comparison is larger than a preset frequency threshold value, whether the current distance between the inductance coil and the bottom of the detected capacitor is smaller than the detection distance is indicated, namely the drum bottom of the detected capacitor appears.
The detection device for the bottom of the capacitor drum can further comprise an alarm module, the alarm module is connected with the detection module, and if the frequency difference value obtained by comparing the frequency of the second electromagnetic oscillation signal with the fixed frequency of the first electromagnetic oscillation signal is larger than a preset frequency threshold value, the alarm module is triggered to alarm that the bottom of the detected capacitor is in a mode of characters, sounds, flashing and the like.
Exemplified by amplitude modulationThe inductance coil and the capacitor form an LC parallel resonant circuit, the initial tuning frequency of the LC parallel resonant circuit is set, at the moment, the impedance of the resonant circuit is maximum, and the voltage drop of the LC parallel resonant circuit is also maximum. When the capacitor to be detected approaches the inductance coil, the loss power is increased, the loop is detuned, and the output is achievedThe output voltage is correspondingly smaller, so that the amplitude of the output voltage is approximately linear with the distance between the capacitor and the coil within a certain range. Since the frequency of the output voltage is always constant, measuring the change in the amplitude of the output voltage can detect the change in the displacement of the bottom of the capacitor relative to the inductor. By setting the distance between the capacitor to be detected without the drum bottom and the inductance coil as the detection distance, the generated voltage amplitude is the initial amplitude of the first electromagnetic oscillation signal. When the detected capacitor is at the bottom of the drum, the relative distance between the detected capacitor and the inductance coil changes, so that the amplitude of the detected voltage changes. The voltage amplitude of the second electromagnetic oscillation signal radiated by the electromagnetic induction signal generating module detected by the detecting module generates a pressure difference with the initial amplitude, and when the pressure difference is larger than a preset amplitude threshold value, the bottom of the detected capacitor can be judged to appear.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of the detection device 10. Specifically, the electromagnetic induction signal generating module includes a three-point resonant circuit.
The three-point resonant circuit includes: the transistor Q1, the fourth capacitor C1, the fifth capacitor C2, the sixth capacitor C5, the seventh capacitor C3, the third resistor R1, the fourth resistor R2 and the fifth resistor R3;
the induction coil 11 is connected with a fourth capacitor C1, a fifth capacitor C2, a third resistor R1 and a collector electrode of the triode Q1;
the third resistor R1, the fourth resistor R2 and the sixth capacitor C5 are connected with the base electrode of the triode Q1;
the seventh capacitor C3 and the fifth resistor R3 are connected to the emitter of the transistor Q1.
The detection device of the capacitor also comprises an isolation direct-current capacitor C4;
the isolation direct-current capacitor C4 is connected with the induction coil 11, the collector electrode of the triode Q1 and the fifth capacitor C2;
the detection module 12 comprises a singlechip or a programmable logic controller; the singlechip or the programmable logic controller is connected with the isolation direct-current capacitor C4.
The detection module 12 is further configured to compare the amplitude difference between the second electromagnetic oscillation signal and the first electromagnetic oscillation signal, and if the amplitude difference is greater than a preset amplitude threshold, confirm that the current distance between the induction coil 11 and the detected capacitor 20 is smaller than the detection distance, i.e. the detected capacitor has a drum bottom. The detection module 12 is connected with a triggering alarm module to signal that the detected capacitor has a drum bottom in a text, sound, flashing and other modes.
The principle of operation of the circuit shown in fig. 3:
c1, C2, C3, C5, R1, R2, R3, Q1 and the inductance coil L form a three-point resonant circuit, and an alternating current with fixed frequency is formed on the L. The output amplitude changes due to detuning when the measured capacitor is close to L. And C4 is a direct current isolation capacitor, is connected with elements capable of AD sampling such as a singlechip or a PLC, samples the amplitude of the voltage output by the C4 by the elements, calculates whether the difference value between the current voltage amplitude and the initial voltage amplitude generated by the tested capacitor is larger than a preset amplitude threshold value after sampling, and if so, confirms that the current distance between the induction coil and the bottom of the tested capacitor is smaller than the detection distance, namely the tested capacitor has a drum bottom.
In the above embodiment, the detection device for the bottom of the capacitor drum includes an electromagnetic induction signal generating module of an induction coil and a detection module connected to the electromagnetic induction signal generating module, where the electromagnetic induction signal generating module is configured to radiate an electromagnetic oscillation signal, and when a detection distance between the induction coil and the capacitor to be detected is reached, generate a second electromagnetic oscillation signal, the detection module is configured to obtain the second electromagnetic oscillation signal, compare the second electromagnetic oscillation signal with the first electromagnetic oscillation signal, and confirm, according to a comparison result, whether a current distance between the induction coil and the bottom of the capacitor to be detected is smaller than the detection distance, if yes, it indicates that the capacitor to be detected has a bottom of the capacitor to be detected, and generate an eddy current effect when the distance between the induction coil and the capacitor to be detected is the detection distance, and determine whether the capacitor has a bottom of the capacitor drum by detecting a change of signals in the electromagnetic induction signal generating module caused by the eddy current effect.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
The foregoing describes a device for detecting the bottom of a capacitor drum according to the present utility model, and those skilled in the art will recognize that there are variations in the specific embodiments and application scope of the present utility model according to the ideas of the embodiments of the present utility model.
Claims (10)
1. A device for detecting a bottom of a capacitor drum, comprising:
the electromagnetic induction signal generation module is provided with an induction coil and is used for radiating electromagnetic oscillation signals, and when the distance between a detected capacitor and the induction coil is shortened, the electromagnetic oscillation signals radiated by the induction coil are changed based on the eddy current effect;
the detection module comprises a singlechip or a programmable logic controller, is connected with the electromagnetic induction signal generation module and is used for acquiring a first electromagnetic oscillation signal radiated by the electromagnetic induction signal generation module when the capacitor is not close to the detection module, and comparing a second electromagnetic oscillation signal radiated by the electromagnetic induction signal generation module with the change degree of the first electromagnetic oscillation signal relative to the second electromagnetic oscillation signal when the detected capacitor is close to the preset position of the induction coil so as to determine whether the detected capacitor has a drum bottom.
2. The apparatus according to claim 1, wherein the electromagnetic induction signal generation module includes:
a first oscillator and a second oscillator including the induction coil;
the first oscillator is used for generating a square wave signal with a preset fixed frequency and transmitting the square wave signal to the second oscillator;
the second oscillator is used for oscillating the square wave signal into a sine wave and transmitting the sine wave signal to the first oscillator.
3. The detection apparatus according to claim 2, wherein the first oscillator includes a counter, a first resistor, a second resistor, a first capacitor, and a second capacitor;
the clock generating pin RTC of the counter is connected with one end of the first resistor, and the clock generating pin CTC of the counter is connected with the first end of the second resistor;
the second end of the first resistor is connected with the first end of the first capacitor; the clock input pin RS of the counter is connected to the second end of the first resistor;
the second end of the second resistor is connected with the second end of the second capacitor.
4. A detection device according to claim 3, wherein the second oscillator further comprises a third capacitor;
the third capacitor is connected with the induction coil in parallel, one end of the third capacitor is connected with the reset end MR of the counter, and the other end of the third capacitor is connected with the second end of the first capacitor and the second end of the second capacitor.
5. The detecting device according to claim 4, wherein,
the singlechip or the programmable logic controller is connected with the counter.
6. The apparatus of any one of claims 2 to 5, wherein the detection module is further configured to compare the degree of change in the frequency of the first electromagnetic oscillation signal relative to the second electromagnetic oscillation signal to determine whether the detected capacitor has a drum bottom.
7. The detection apparatus according to claim 1, wherein the electromagnetic induction signal generation module comprises a three-point resonant circuit.
8. The detection apparatus according to claim 7, wherein the three-point resonant circuit includes: a triode, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third resistor, a fourth resistor and a fifth resistor;
the induction coil is connected with the fourth capacitor, the fifth capacitor, the third resistor and the collector electrode of the triode;
the third resistor, the fourth resistor and the sixth capacitor are connected with the base electrode of the triode;
and the seventh capacitor and the fifth resistor are connected with the emitter of the triode.
9. The detection apparatus according to claim 8, wherein the detection apparatus further comprises an isolated dc capacitor;
the isolation direct-current capacitor is connected with the induction coil, the collector electrode of the triode and the fifth capacitor;
the singlechip or the programmable logic controller is connected with the isolation direct-current capacitor.
10. The device according to any one of claims 7 to 9, wherein the detection module is further configured to compare the degree of change in the amplitude of the first electromagnetic oscillation signal relative to the second electromagnetic oscillation signal to determine whether the detected capacitor has a drum bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320630679.7U CN220137067U (en) | 2023-03-17 | 2023-03-17 | Detection device for bottom of capacitor drum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320630679.7U CN220137067U (en) | 2023-03-17 | 2023-03-17 | Detection device for bottom of capacitor drum |
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| CN220137067U true CN220137067U (en) | 2023-12-05 |
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| CN202320630679.7U Active CN220137067U (en) | 2023-03-17 | 2023-03-17 | Detection device for bottom of capacitor drum |
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