CN114935715A - Broken wire detection system - Google Patents
Broken wire detection system Download PDFInfo
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- CN114935715A CN114935715A CN202210551937.2A CN202210551937A CN114935715A CN 114935715 A CN114935715 A CN 114935715A CN 202210551937 A CN202210551937 A CN 202210551937A CN 114935715 A CN114935715 A CN 114935715A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/30—Marginal testing, e.g. by varying supply voltage
- G01R31/3004—Current or voltage test
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Abstract
The invention provides a broken wire detection system, which comprises a broken wire detection circuit, a differential-to-single end circuit and a broken wire judgment system, wherein the differential-to-single end circuit is connected with the broken wire detection circuit; the broken line detection circuit is used for detecting the broken line state of the ABZ three phases of the ABZ incremental encoder according to the differential level signals of the ABZ three phases output by the ABZ incremental encoder; the differential-to-single-ended circuit is used for converting the differential level signals of the ABZ three phases output by the ABZ incremental encoder into single-ended pulse signals of the ABZ three phases; the disconnection judging system is used for judging the authenticity of the disconnection state of the ABZ three phases detected and output by the disconnection detecting circuit according to the single-ended pulse signals of the ABZ three phases converted and output by the differential to single-ended circuit. The invention adopts a double detection and judgment mechanism of the broken line detection circuit and the broken line judgment system, ensures the high reliability of the broken line detection system and solves the problem that the broken line detection of the current incremental encoder is not accurate and reliable enough.
Description
Technical Field
The invention relates to the technical field of ABZ incremental encoder disconnection detection, in particular to a disconnection detection system.
Background
When the ABZ incremental encoder is applied, if a certain phase is disconnected or a certain line is disconnected, the driver cannot correctly control the motor, so that faults are caused, and serious accidents such as galloping and the like can be caused seriously; if false alarm occurs, the problem that the driver alarms and cannot work normally can be caused.
In the prior art, a detection scheme is generally single, a single hardware detection circuit detection scheme is generally adopted, and is named as scheme one, as shown in fig. 1, a used hardware detection circuit is generally designed by adopting a simple logic device, such as a nor gate, so that the hardware detection circuit belongs to a logic gate circuit, and as the logic gate circuit directly adopts an absolute single-ended level for judgment, rather than a relative differential level, a logic gate capacitor is easily interfered, so that inaccurate detection or false alarm is easily caused; or a single software logic-based detection and judgment scheme, named scheme two, as shown in fig. 2, the detection and judgment scheme lacks a hardware detection circuit, resulting in design redundancy of the detection scheme.
Disclosure of Invention
The invention provides a broken line detection system which is used for solving the problem that the broken line detection of an ABZ incremental encoder is not accurate and reliable enough.
This broken string detecting system includes:
the circuit comprises a broken line detection circuit, a detection circuit and a control circuit, wherein the broken line detection circuit is used for detecting the broken line state of the ABZ three phases of the ABZ incremental encoder according to the differential level signals of the ABZ three phases output by the ABZ incremental encoder;
the differential-to-single-ended circuit is used for converting the differential level signals of the ABZ three phases output by the ABZ incremental encoder into single-ended pulse signals of the ABZ three phases;
and the disconnection judging system is used for judging the authenticity of the disconnection state of the ABZ three phases detected and output by the disconnection detecting circuit according to the single-ended pulse signals of the ABZ three phases converted and output by the differential to single-ended circuit.
In a specific possible implementation, the disconnection detection circuit includes a rectifier bridge and a comparator;
the rectifier bridge is used for converting the differential level signals of the ABZ three phases output by the ABZ incremental encoder into voltage difference information and transmitting the voltage difference information to the comparator;
the comparator is used for detecting the disconnection state of the ABZ three phases of the ABZ incremental encoder according to the voltage difference information converted and output by the rectifier bridge.
In a specific possible implementation, the differential to single-ended circuit comprises a counter;
the counter is used for counting according to the ABZ three-phase single-ended pulse signals converted and output by the differential-to-single-ended circuit.
In a specific implementation scheme, the disconnection judging system determines the judging state before judging the authenticity of the disconnection state of the output ABZ three phases detected by the disconnection detecting circuit according to the single-ended pulse signals of the ABZ three phases converted and output by the differential-to-single-ended circuit.
In a specific implementation, the disconnection judging system judges the current rotation direction of the motor through AB-phase orthogonal phase discrimination processing according to the ABZ three-phase single-ended pulse signal converted and output by the differential-to-single-ended circuit; determining the current judgment state to be a first judgment state or a second judgment state through AB phase edge signal capture and level detection according to the current rotation direction of the motor; and determining the current judgment state to be a third judgment state through Z-phase edge signal detection and counting information of the counter.
In a specific implementation, when the current rotation direction of the motor is clockwise, the wire breakage judging system determines that the current judging state is the first judging state; and when the current rotating direction of the motor is anticlockwise, the wire breakage judging system determines that the current judging state is the second judging state.
In a specific possible implementation, the broken line judgment system judges that the broken line state of the three ABZ phases detected and output by the broken line detection circuit is true in the determined current judgment state and when the broken line detection circuit detects and outputs the broken line state of the three ABZ phases of the ABZ incremental encoder.
In a specific implementation scheme, the system further comprises an alarm, and the disconnection judging system controls the alarm to alarm when judging that the disconnection state of the ABZ three phases detected and output by the disconnection detecting circuit is true.
In a specific possible embodiment, the alarm is an audible and visual alarm.
In a specific possible embodiment, the alarm has a disconnection state indicator lamp corresponding to the disconnection state of the ABZ three phases showing the detection output of the disconnection detection circuit.
In the above embodiment, the present application adopts a dual detection and judgment mechanism of the disconnection detection circuit and the disconnection judgment system, and three judgment states determined by the disconnection judgment system can also be regarded as pre-judgment states, and only when the disconnection judgment system judges that the first, second or third judgment states occur, and when the disconnection detection circuit detects that the phase of the ABZ incremental encoder has a disconnection state at the same time, the disconnection judgment state is judged to be a true disconnection, which is helpful for ensuring the high reliability of the disconnection detection system and solving the problem that the current incremental encoder is not accurate and reliable enough in disconnection detection.
Drawings
FIG. 1 is a schematic block diagram of a first prior art approach to break line detection;
FIG. 2 is a schematic block diagram of a second conventional solution in the wire breakage detection technology;
FIG. 3 is a schematic block diagram of a disconnection detection system provided by the present invention;
FIG. 4 is a schematic diagram illustrating the determination of clockwise rotation of the motor;
FIG. 5 is a schematic diagram illustrating the determination of counterclockwise rotation of the motor;
FIG. 6 is a schematic block diagram of the detection of the disconnection detection circuit for detecting the disconnection status of the ABZ incremental encoder;
FIG. 7 is a first schematic diagram of the judgment of the disconnection judging system for judging the current judgment state;
FIG. 8 is a second schematic diagram of the judgment of the current judgment state by the disconnection judgment system;
FIG. 9 is a schematic block diagram of a determination of the ABZ incremental encoder wire breakage by the wire breakage determination system in a first determination state;
FIG. 10 is a schematic block diagram of a wire break determination system for determining a wire break in an ABZ incremental encoder in a second determination state;
FIG. 11 is a schematic block diagram of the determination of the ABZ incremental encoder wire breakage by the wire breakage determination system in a third determination state;
fig. 12 is a circuit diagram of a differential-to-single-ended circuit receiving differential level signals of three phases ABZ output from the ABZ incremental encoder and converting the differential level signals into single-ended pulse signals of three phases ABZ;
FIG. 13 is a circuit diagram of the disconnection detection circuit for detecting the disconnection of phase A of the ABZ incremental encoder;
FIG. 14 is a circuit diagram of the disconnection detection circuit for detecting the disconnection of phase B of the ABZ incremental encoder;
fig. 15 is a circuit diagram of the disconnection detecting circuit for detecting disconnection of the Z phase of the ABZ incremental encoder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
For convenience of understanding of the broken line detection system provided by the embodiment of the invention, firstly, an application scenario of the broken line detection system is explained, and the broken line detection system is applied to the technical field of broken line detection of the ABZ incremental encoder and is used for solving the problem that the broken line detection of the ABZ incremental encoder is not accurate and reliable enough.
The invention provides a broken wire detection system, as shown in fig. 3, the broken wire detection system comprises a broken wire detection circuit 2, a differential-to-single-ended circuit 3 and a broken wire judgment system 4. The disconnection detection circuit 2 is configured to detect a disconnection state of the three ABZ phases of the ABZ incremental encoder 1 according to the differential level signals of the three ABZ phases output by the ABZ incremental encoder 1. The differential-to-single-ended circuit 3 is used for converting the differential level signals of the three ABZ phases output by the ABZ incremental encoder 1 into single-ended pulse signals of the three ABZ phases. With reference to fig. 12, the differential-to-single-ended circuit 3 adopts an RS422 standard receiving circuit to convert A, B, Z phases of differential level signals into ENCODE _ A, ENCODE _ B, ENCODE _ Z single-ended pulse signals, respectively. The disconnection judging system 4 is used for judging the authenticity of the disconnection state of the output ABZ three phases detected by the disconnection detecting circuit 2 according to the single-ended pulse signals of the ABZ three phases converted and output by the differential to single-ended circuit 3.
Here, the disconnection detecting circuit 2 can detect a disconnection state of any one or more of the three phases ABZ of the ABZ incremental encoder 1. For example, the disconnection detecting circuit 2 may detect that the a phase of the ABZ incremental encoder 1 is in a disconnected state, that the B phase of the ABZ incremental encoder 1 is in a disconnected state, that the Z phase of the ABZ incremental encoder 1 is in a disconnected state, that two of the three ABZ phases of the ABZ incremental encoder 1 are simultaneously in a disconnected state, and that the three ABZ phases of the ABZ incremental encoder 1 are simultaneously in a disconnected state.
In the embodiment of the present application, the disconnection detecting circuit 2 includes a rectifier bridge and a comparator, wherein the rectifier bridge specifically adopts a rectifier bridge BAT54BRW, the rectifier bridge is configured to convert the differential level signals of the three ABZ phases output by the ABZ incremental encoder 1 into voltage difference information and transmit the voltage difference information to the comparator, and the comparator is configured to detect the disconnection state of the three ABZ phases of the ABZ incremental encoder 1 according to the voltage difference information output by the rectifier bridge conversion, and can detect the disconnection state of any one phase or any multiple phases of the three ABZ phases of the ABZ incremental encoder 1. In the present embodiment, the disconnection state of the three phases ABZ of the incremental ABZ encoder 1 detected by the disconnection detecting circuit 2 is only used as a preliminary judgment, and the judgment logic is as shown in fig. 6, but the disconnection judging system 4 is finally required to judge the authenticity of the disconnection state of the three phases ABZ detected and output by the disconnection detecting circuit 2.
Referring to fig. 13, the disconnection detection circuit 2 will be described as an example of detecting the disconnection of the phase a of the ABZ incremental encoder 1. The differential level signal of A + and A-is converted into a voltage difference signal to be input to a comparator for level comparison, the comparator specifically adopts a comparator LM293, and the minimum recognizable input voltage difference between A + and A-is 0.4V. If the pin 3 voltage of the U21A is greater than the pin 2 voltage, the comparator output signal ENCODE _ a _ Disconnected is logic high, indicating that the connection is abnormal and the line is broken. If the 3-pin voltage of the U21A is less than the 2-pin voltage, the comparator output signal ENCODE _ a _ Disconnected is logic low, indicating that the connection is normal and not broken. Referring to fig. 14 and 15, the disconnection detecting circuit 2 performs disconnection detection on the B phase and the Z phase of the ABZ incremental encoder 1 in the same manner, and details thereof are not repeated here. Therefore, the broken line detection circuit 2 can simultaneously detect the state of broken line of any one phase line or multiple phase lines of the ABZ incremental encoder 1.
The invention provides a method for judging the disconnection of the ABZ incremental encoder, which is characterized in that a disconnection detection circuit 2 is designed into a differential level signal input mode, the relative difference voltage of each phase of the ABZ incremental encoder 1 is detected for judgment, and the judgment is carried out by combining a logic detection system, namely a disconnection judgment system 4, so that the accuracy of the disconnection detection is improved. The lowest effective voltage difference value which can be identified by the disconnection detection circuit 2 adopting the differential level signal input mode is close to the amplitude value of the RS422/RS485 standard receiving level, and the disconnection detection circuit has strong anti-jamming capability compared with a single-ended level logic detection circuit in the prior art. On the other hand, the amplitude of the effective voltage input by the detected differential level signal is almost the same as the amplitude of the signal received by the differential-to-single-ended circuit 3, so that the detection is very accurate. Conventional logic detection circuits that rely on single-ended levels cannot recognize such low magnitude voltages.
In the embodiment of the present application, the differential-to-single-ended circuit 3 includes a counter, and the counter is configured to count according to the single-ended pulse signals of the ABZ three phases converted and output by the differential-to-single-ended circuit 3. The disconnection judging system 4 determines the judging state before judging the authenticity of the disconnection state of the output ABZ three phases detected by the disconnection detecting circuit 2 according to the single-ended pulse signals of the ABZ three phases converted and output by the differential to single-ended circuit 3. The disconnection judging system 4 judges the current rotation direction of the motor through AB-phase orthogonal phase discrimination processing according to the ABZ three-phase single-ended pulse signal converted and output by the differential-to-single-ended circuit 3, determines the current judging state to be a first judging state or a second judging state through AB-phase edge signal capturing and level detection according to the current rotation direction of the motor, and determines the current judging state to be a third judging state through Z-phase edge signal detection and counting information of a counter.
In the embodiment of the present application, referring to fig. 7, when the current rotation direction of the motor is clockwise, the disconnection determination system determines that the current determination state is the first determination state; when the current rotating direction of the motor is anticlockwise, the disconnection judging system determines that the current judging state is a second judging state. Specifically, the rotation direction of the motor at present can be determined by phase discrimination processing in which the AB phases are orthogonal, so that the disconnection determining system 4 determines whether to determine the present determination state (the first determination state or the second determination state) by using an AB-phase edge signal capturing and level detecting mechanism in the clockwise direction or the counterclockwise direction.
Referring to fig. 4, when the motor rotates clockwise, the a phase leads the B phase by 90 °, the B phase level corresponding to the rising edge of the a phase must be low, and the B phase level corresponding to the falling edge of the a phase must be high. The level of the a-phase corresponding to the rising edge of the B-phase must be high, and the level of the a-phase corresponding to the falling edge of the B-phase must be low. Referring to fig. 5, when the motor rotates counterclockwise, phase a lags behind phase B by 90 °, phase B corresponding to the rising edge of phase a must be at a high level, phase B corresponding to the falling edge of phase a must be at a low level, phase a corresponding to the rising edge of phase B must be at a low level, and phase a corresponding to the falling edge of phase B must be at a high level. Therefore, the rotation direction of the motor can be judged, and the current judgment state is determined to be the first judgment state or the second judgment state.
Referring to fig. 8, when a rising edge of a Z-phase narrow pulse signal is captured, a counter is used to start counting for an a-phase or a B-phase, when the next rising edge arrives, the counting is stopped, and after comparison, the counter is cleared and started again.
In the present embodiment, the disconnection judging system 4 judges that the disconnection state of the three phases ABZ detected and outputted by the disconnection detecting circuit 2 is true in the determined current judgment state and when the disconnection detecting circuit 2 detects the disconnection state of the three phases ABZ of the output ABZ incremental encoder 1. Specifically, after the disconnection detecting circuit 2 detects the disconnection state of the three ABZ phases of the ABZ incremental encoder 1, the disconnection state of the three ABZ phases of the ABZ incremental encoder 1 detected by the disconnection detecting circuit 2 is used as a preliminary judgment, and then the disconnection judging system 4 judges the current judgment state based on the judgment mechanism and the count of the counter and the single-ended pulse signal of the three ABZ phases converted and output by the differential to single-ended circuit 3, and judges the authenticity of the disconnection state of the three ABZ phases of the ABZ incremental encoder 1 detected by the disconnection detecting circuit 2 in the current judgment state.
In the embodiment of the present application, as shown in fig. 9, when the disconnection judging system 4 determines that the current judging state is the first judging state, in this judging state, the disconnection judging system 4 judges true or false according to the disconnection detection information of the three phases ABZ of the ABZ incremental encoder 1 detected in real time by the disconnection detecting circuit 2, and if the disconnection detecting circuit 2 detects that the three phases ABZ of the ABZ incremental encoder 1 are in a disconnection state, it determines that a true disconnection phenomenon occurs. That is, the disconnection judging system 4 judges that the disconnection state of the three phases ABZ of the ABZ incremental encoder 1 detected by the disconnection detecting circuit 2 is a real disconnection in the first judgment state. The phase of the ABZ incremental encoder 1 that is actually broken is the phase of the ABZ three phases of the ABZ incremental encoder 1 that is detected by the broken line detection circuit 2.
As shown in fig. 10, when the disconnection judging system 4 determines that the current judging state is the second judging state, in this judging state, the disconnection judging system 4 judges true or false according to the disconnection detection information of the three phases ABZ of the ABZ incremental encoder 1 detected in real time by the disconnection detecting circuit 2, and if the disconnection detecting circuit 2 detects that the three phases ABZ of the ABZ incremental encoder 1 are disconnected, it is determined that the true disconnection phenomenon occurs. That is, the disconnection judging system 4 judges that the disconnection state of the three phases ABZ of the ABZ incremental encoder 1 detected by the disconnection detecting circuit 2 is a real disconnection in the second judgment state. The phase of the ABZ incremental encoder 1 that is actually broken is the phase of the ABZ three phases of the ABZ incremental encoder 1 that is detected by the broken line detection circuit 2.
As shown in fig. 11, when the disconnection judging system 4 determines that the current judging state is the third judging state, in this judging state, the disconnection judging system 4 judges true or false according to the disconnection detection information of the three phases ABZ of the ABZ incremental encoder 1 detected in real time by the disconnection detecting circuit 2, and if the disconnection detecting circuit 2 detects that the three phases ABZ of the ABZ incremental encoder 1 are disconnected, it is determined that the true disconnection phenomenon occurs. That is, the disconnection judging system 4 judges that the disconnection state of the three phases ABZ of the ABZ incremental encoder 1 detected by the disconnection detecting circuit 2 is a real disconnection in the third judging state. The phase of the ABZ incremental encoder 1 that is actually broken is the phase of the ABZ three phases of the ABZ incremental encoder 1 that is detected by the broken line detection circuit 2.
With continued reference to fig. 3, the present invention further comprises an alarm 5, wherein the alarm 5 is an audible and visual alarm. And when the broken line judging system 4 judges that the broken line state of the ABZ three phases output by the broken line detection circuit 2 is true, the alarm 5 is controlled to give an alarm. During specific setting, the alarm 5 is provided with a disconnection state indicator lamp corresponding to the disconnection state of the three ABZ phases detected and output by the disconnection detection circuit 2, namely, the disconnection state indicator lamps are respectively arranged corresponding to the three ABZ phases of the ABZ incremental encoder 1.
In the embodiment of the present application, the disconnection detecting circuit 2 detects a disconnection state occurring in the ABZ three phases of the ABZ incremental encoder 1, or when three determination states determined by the disconnection determining system 4 occur, the disconnection detecting circuit does not separately serve as a basis for determining the disconnection of the ABZ incremental encoder 1, only when the determination state determined by the disconnection determining system 4 occurs, and when the disconnection detecting circuit 2 detects the disconnection state occurring in the ABZ incremental encoder 1 at the same time, the disconnection state occurring in the ABZ incremental encoder 1 is determined, and a phase of the disconnection state occurring in the ABZ incremental encoder 1 detected by the disconnection detecting circuit 2 is used as an output, and the alarm 5 specifically outputs an alarm. When alarm 5 reported to the police, appeared the corresponding broken string state pilot lamp of broken string state with ABZ incremental encoder 1 and lighted, played the suggestion effect, be convenient for know the looks of ABZ incremental encoder 1 appearance broken string state.
Through the above description, it is not difficult to find that, the dual detection and judgment mechanism of the disconnection detection circuit 1 and the disconnection judgment system 1 is adopted in the present application, three judgment states determined by the disconnection judgment system 1 can also be regarded as pre-judgment states, and only when the disconnection judgment system 1 judges that the first, second or third judgment states occur, and when the disconnection detection circuit 2 detects that the phase of the ABZ incremental encoder 1 has the disconnection state at the same time, the disconnection is judged to be a real disconnection, which is helpful for ensuring the high reliability of the disconnection detection system, and solving the problem that the disconnection detection of the current incremental encoder is not accurate and reliable enough.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A wire break detection system, comprising:
the circuit comprises a broken line detection circuit, a detection circuit and a control circuit, wherein the broken line detection circuit is used for detecting the broken line state of the ABZ three phases of the ABZ incremental encoder according to the differential level signals of the ABZ three phases output by the ABZ incremental encoder;
the differential-to-single-ended circuit is used for converting the differential level signals of the ABZ three phases output by the ABZ incremental encoder into single-ended pulse signals of the ABZ three phases;
and the disconnection judging system is used for judging the authenticity of the disconnection state of the ABZ three phases detected and output by the disconnection detecting circuit according to the single-ended pulse signals of the ABZ three phases converted and output by the differential to single-ended circuit.
2. The disconnection detection system of claim 1 wherein said disconnection detection circuit comprises a rectifier bridge and a comparator;
the rectifier bridge is used for converting the differential level signals of the ABZ three phases output by the ABZ incremental encoder into voltage difference information and transmitting the voltage difference information to the comparator;
the comparator is used for detecting the disconnection state of the ABZ three phases of the ABZ incremental encoder according to the voltage difference information converted and output by the rectifier bridge.
3. The wire break detection system of claim 1, wherein the differential to single ended circuit comprises a counter;
the counter is used for counting according to the ABZ three-phase single-ended pulse signals converted and output by the differential-to-single-ended circuit.
4. The system according to claim 3, wherein the disconnection determining system determines the determination status before determining the authenticity of the disconnection status of the three ABZ phases detected and outputted by the disconnection detecting circuit according to the single-ended pulse signals of the three ABZ phases converted and outputted by the differential-to-single-ended circuit.
5. The wire breakage detection system according to claim 4, wherein the wire breakage judgment system judges the current rotation direction of the motor through AB-phase quadrature phase discrimination processing according to the ABZ three-phase single-ended pulse signal converted and output by the differential-to-single-ended circuit; determining that the current judgment state is a first judgment state or a second judgment state through AB phase edge signal capture and level detection according to the current rotation direction of the motor; and determining that the current judgment state is a third judgment state through Z-phase edge signal detection and counting information of the counter.
6. The disconnection detecting system according to claim 5, wherein the disconnection judging system determines that the current judging state is the first judging state when the current rotation direction of the motor is clockwise; and when the current rotating direction of the motor is anticlockwise, the wire breakage judging system determines that the current judging state is the second judging state.
7. The disconnection detecting system according to claim 6, wherein said disconnection judging system judges that the disconnection state of three phases ABZ outputted by said disconnection detecting circuit is true in the determined current judging state and when said disconnection detecting circuit detects that the disconnection state of three phases ABZ outputted by said ABZ incremental encoder is outputted.
8. The wire breakage detection system according to claim 7, further comprising an alarm, wherein when the wire breakage judgment system judges that the wire breakage state of the ABZ three phases detected and output by the wire breakage detection circuit is true, the alarm is controlled to alarm.
9. The disconnection detection system of claim 8, wherein said alarm is an audible and visual alarm.
10. The system of claim 8, wherein the alarm has a disconnection state indicator light corresponding to a disconnection state of three phases ABZ of the detection output of the disconnection detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210551937.2A CN114935715A (en) | 2022-05-18 | 2022-05-18 | Broken wire detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210551937.2A CN114935715A (en) | 2022-05-18 | 2022-05-18 | Broken wire detection system |
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| CN114935715A true CN114935715A (en) | 2022-08-23 |
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| CN202210551937.2A Pending CN114935715A (en) | 2022-05-18 | 2022-05-18 | Broken wire detection system |
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