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US-12625197-B2 - Underground cable path tester

US12625197B2US 12625197 B2US12625197 B2US 12625197B2US-12625197-B2

Abstract

Disclosed in the present disclosure is an underground cable path tester, in which a first signal processing device is connected to a data port of a primary unit central control module, and a second signal processing device is connected to an output port of the first signal processing device; regarding the first signal processing device, data ports of a signal receiving module, a signal amplifying module, a phase-locked loop module, and a secondary unit central control module are sequentially connected; and regarding the second signal processing device, a probe, a filter module, an amplifier module, and an alarm module are sequentially connected.

Inventors

  • Ming Lei
  • Jianping Zhang

Assignees

  • Yongzhou Noyafa Electronic Co., Ltd.

Dates

Publication Date
20260512
Application Date
20240719
Priority Date
20231215

Claims (15)

  1. 1 . An underground cable path tester, comprising a primary unit and a secondary unit, wherein: the primary unit comprises a primary unit central control module, a first signal processing device, a second signal processing device, and a primary unit power module, the first signal processing device is connected to a data port of the primary unit central control module, the second signal processing device is connected to an output port of the first signal processing device, the primary unit power module is used to supply power for the primary unit, the second signal processing device is a signal transmitting interface when the first signal processing device is a signal transmitting module, and the second signal processing device is a signal emitting module when the first signal processing device is a signal processing module; the secondary unit comprises a secondary unit processing device and a secondary unit power module, the secondary unit processing device comprises a first secondary unit processing device or a second secondary unit processing device, the first secondary unit processing device corresponds to the signal transmitting module, and the second secondary unit processing device corresponds to the signal processing module; the first secondary unit processing device comprises a secondary unit central control module, a signal receiving module, a signal amplifying module, and a phase-locked loop module, the signal receiving module is connected to the signal amplifying module, an output port of the signal amplifying module is connected to the phase-locked loop module, and the phase-locked loop module is connected to a data port of the secondary unit central control module; the second secondary unit processing device comprises a probe interface, a filter module, an amplifier module, and an alarm module, the probe interface is connected to an input port of the filter module, an output port of the filter module is connected to an input port of the amplifier module, and the output port of the amplifier module is connected to an input port of the alarm module; and the secondary unit power module is used to supply power for the secondary unit.
  2. 2 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal transmitting module, the first signal processing device comprises a dual-D flip-flop U 6 , an operational amplifier U 7 , an electronic switch U 108 , a triode Q 11 , a triode Q 13 , and an isolation transformer TR 1 , an interior of the dual-D flip-flop U 6 comprises a D flip-flop U 6 -A and a D flip-flop U 6 -B, an interior of the operational amplifier U 7 includes an operational amplifier U 7 -A and an operational amplifier U 7 -B, a data port of the central control module is connected to an input port of the D flip-flop U 6 -B, an output port of the D flip-flop U 6 -B is connected to an input port of the D flip-flop U 6 -A, an output port of the D flip-flop U 6 -A is connected to an input port of the operational amplifier U 7 -A, an output port of the operational amplifier U 7 -A is connected to an I/O port B of the electronic switch U 108 , the I/O port B of the electronic switch U 108 is connected to an I/O port A of the electronic switch U 108 , the I/O port A of the electronic switch U 108 is connected to an input port of the operational amplifier U 7 -B, a 9.0V power supply is connected to ground via a resistor R 56 and a resistor R 55 , a common end between the resistor R 56 and the resistor R 55 is connected to the I/O port A of the electronic switch U 108 , a collector of the triode Q 11 is connected to a 9.0V power supply, an emitter of the triode Q 11 is connected to an emitter of the triode Q 13 , a collector of the triode Q 13 is grounded, a base of the triode Q 11 is connected to a base of the triode Q 13 , an output port of the operational amplifier U 7 -B is connected to the base of the triode Q 11 and the base of the triode Q 13 , the output port of the operational amplifier U 7 -B is connected to the emitter of the triode Q 11 and the emitter of the triode Q 13 via a resistor R 64 , the emitter of the triode Q 11 and the emitter of the triode Q 13 are connected to a primary coil of the isolation transformer TR 1 through a capacitor C 11 and an inductor L 3 connected in series, and the secondary coil of the isolation transformer TR 1 is connected to an interface J 3 - 1 ; when the first signal processing device is the signal processing module, the signal processing module comprises an MOS transistor Q 207 , an MOS transistor Q 204 , an MOS transistor Q 205 , a triode Q 206 and a triode Q 203 , a gate of the MOS transistor Q 207 is a signal input port of the signal processing module, the gate of the MOS transistor Q 207 is connected to a data port of the central control module via a resistor R 201 , a source of the MOS transistor Q 207 is grounded, a drain of the MOS transistor Q 207 is connected to a +9V power supply via a resistor R 202 , gates of the MOS transistor Q 204 and the MOS transistor Q 205 are connected to the drain of the MOS transistor Q 207 respectively, a drain of the MOS transistor Q 204 is connected to a +9V power supply, a drain of the MOS transistor Q 205 is grounded, a source of the MOS transistor Q 204 is connected to a source of the MOS transistor Q 205 , the source of the MOS transistor Q 204 is connected to a base of the triode Q 206 via a resistor R 203 and a resistor R 204 connected in series, a capacitor C 201 and an inductor L 201 are connected in series, the capacitor C 201 and the inductor L 201 connected in series are connected to a resistor R 204 in parallel, a base of the triode Q 206 is connected to a +9V power supply via a resistor R 205 , an emitter of the triode Q 206 is grounded via a resistor R 206 , a collector of the triode Q 206 is connected to a +9V power supply via a resistor R 201 and an inductor L 202 connected in series, the collector of the triode Q 206 is connected to a base of the triode Q 203 via a capacitor C 202 and an inductor L 203 connected in series, an emitter of the triode Q 203 is grounded via a variable resistor VR 1 , a center tap of the variable resistor VR 1 is grounded via a resistor R 207 , a collector of the triode Q 203 is connected to a +9V power supply via an inductor L 204 , a base of the triode Q 203 is connected to the signal emitting module via a resistor R 208 , an inductor L 205 , a capacitor C 203 , and a thermistor PTC 1 sequentially connected in series, a common end between the resistor R 208 and the inductor L 205 is connected to the collector of the triode Q 203 , and a common end between the capacitor C 203 and the thermistor PTC 1 is grounded via a capacitor C 204 and an inductor L 206 connected in series.
  3. 3 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is a signal transmitting module, a data port of the primary unit central control module is connected with a primary unit electronic control switch, the primary unit electronic control switch comprises a triode Q 31 , a triode Q 32 , and a triode Q 33 , bases of the triode Q 31 , the triode Q 32 , and the triode Q 33 are connected to data ports of the primary unit central control module respectively, emitters of the triode Q 31 , the triode Q 32 , and the triode Q 33 are grounded respectively, and collectors of the triode Q 31 , the triode Q 32 , and the triode Q 33 are connected a control port of an electronic switch U 108 respectively.
  4. 4 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal transmitting module, the primary unit further comprises a signal feedback module, the signal feedback module comprises an operational amplifier U 1 , an operational amplifier U 9 , an operational amplifier U 12 -A, and an operational amplifier U 12 -B, the operational amplifier U 1 , operational amplifier U 9 , operational amplifier U 12 -A, and operational amplifier U 12 -B are connected in sequence to form a four-stage amplification system, a signal input port of the signal feedback module is connected to a primary coil of an isolation transformer TR 1 , and an output port of the signal feedback module is connected to a data port of the primary unit central control module.
  5. 5 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is a signal transmitting module, the signal receiving module comprises a receiving coil L 31 , a receiving coil L 32 , and a receiving coil L 33 , the signal amplifying module comprises an X-axis primary amplifying module, a Y-axis primary amplifying module, a Z-axis primary amplifying module, an X-axis secondary amplifying module, a Y-axis secondary amplifying module, and a Z-axis secondary amplifying module, and the phase-locked loop module comprises an X-axis phase-locked loop module, a Y-axis phase-locked loop module, and a Z-axis phase-locked loop module; the receiving coil L 31 is connected to an input port of the X-axis primary amplifying module, the X-axis primary amplifying module comprises an operational amplifier U 1 -A and an operational amplifier U 1 -B, the operational amplifier U 1 -A and the operational amplifier U 1 -B are connected to form a two-stage amplification circuit, the X-axis primary amplifying module is connected to the X-axis secondary amplifying module via an interface J 1 , the X-axis secondary amplifying module comprises an operational amplifier U 8 -A and an operational amplifier U 8 -B, the operational amplifier U 8 -A and the operational amplifier U 8 -B are connected to form a two-stage amplification circuit, one branch of an output port of the X-axis secondary amplifying module is connected to a data port of the secondary unit central control module, another branch of the output port of the X-axis secondary amplifying module is connected to an input port of the X-axis phase-locked loop module, an output port of the X-axis phase-locked loop module is connected to a data port of the secondary unit central control module, a clock signal port of the X-axis phase-locked loop module is connected to an X-axis channel selector U 20 , and a control port of the X-axis channel selector U 20 is connected to a data port of the secondary unit central control module; the receiving coil L 32 is connected to an input port of the Y-axis primary amplifying module, the Y-axis primary amplifying module comprises an operational amplifier U 2 -A and an operational amplifier U 2 -B, the operational amplifier U 2 -A and the operational amplifier U 2 -B are connected to form a two-stage amplification circuit, the Y-axis primary amplifying module is connected to the Y-axis secondary amplifying module via an interface J 1 , the Y-axis secondary amplifying module comprises an operational amplifier U 9 -A and an operational amplifier U 9 -B, the operational amplifier U 9 -A and the operational amplifier U 9 -B are connected to form a two-stage amplification circuit, one branch of an output port of the Y-axis secondary amplifying module is connected to a data port of the secondary unit central control module, another branch of the output port of the Y-axis secondary amplifying module is connected to an input port of the Y-axis phase-locked loop module, an output port of the Y-axis phase-locked loop module is connected to a data port of the secondary unit central control module, a clock signal port of the Y-axis phase-locked loop module is connected to an Y-axis channel selector U 13 , and a control port of the Y-axis channel selector U 13 is connected to a data port of the secondary unit central control module; and the receiving coil L 33 is connected to an input port of the Z-axis primary amplifying module, the Z-axis primary amplifying module comprises an operational amplifier U 3 -A and an operational amplifier U 3 -B, the operational amplifier U 3 -A and the operational amplifier U 3 -B are connected to form a two-stage amplification circuit, the Z-axis primary amplifying module is connected to the Z-axis secondary amplifying module via an interface J 1 , the Z-axis secondary amplifying module comprises an operational amplifier U 10 -A and an operational amplifier U 10 -B, the operational amplifier U 10 -A and the operational amplifier U 10 -B are connected to form a two-stage amplification circuit, one branch of an output port of the Z-axis secondary amplifying module is connected to a data port of the secondary unit central control module, another branch of the output port of the Z-axis secondary amplifying module is connected to an input port of the Z-axis phase-locked loop module, an output port of the Z-axis phase-locked loop module is connected to a data port of the secondary unit central control module, a clock signal port of the Z-axis phase-locked loop module is connected to an Z-axis channel selector U 10 , and a control port of the Z-axis channel selector U 10 is connected to a data port of the secondary unit central control module.
  6. 6 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal transmitting module, the secondary unit further comprises a wireless voltage detection module, the wireless voltage detection module comprises an NCV coil, an operational amplifier U 4 -B, and an operational amplifier U 14 , the NCV coil is connected to an input port of the operational amplifier U 4 -B, an output of the operational amplifier U 4 -B is connected to an input port of the operational amplifier U 14 , and an output port of the operational amplifier U 14 is connected to a data port of the secondary unit central control module.
  7. 7 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal transmitting module, a data port of the secondary unit central control module is connected with an audio amplifier chip U 15 , and an output port of the audio amplifier chip U 15 is connected with a speaker; and when the first signal processing device is the signal processing module, the alarm module comprises an audio power amplifier U 101 and a speaker BZ 1 , an output port of the amplifier module is connected to a signal input port of the audio power amplifier U 101 , and an output port of the audio power amplifier U 101 is connected to the speaker BZ 1 .
  8. 8 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal transmitting module, a crystal oscillator module is connected between an OSC_IN interface and an OSC_OUT interface of the primary unit central control module, and between an OSC_IN interface and an OSC_OUT interface of the secondary unit central control module respectively, a power-on reset module is connected to an NRST interface of the primary unit central control module and an NRST interface of the secondary unit central control module respectively, wherein the power-on reset module comprises a capacitor and a resistor, the capacitor is connected between ground and the NRST interface of the corresponding central control module, and the resistor is connected between a positive power supply and the NRST interface of the corresponding central control module; a display module is connected to a data port of the primary unit central control module and a data port of the secondary unit central control module respectively; a backlight module is connected to the data port of the primary unit central control module and the data port of the secondary unit central control module respectively, wherein the backlight module comprises a current limiting resistor R 22 , an electronic control switch Q 10 , and a backlight interface CON 2 , the current limiting resistor R 22 , the backlight interface CON 2 , and the electronic control switch Q 10 are sequentially connected in series between the positive power supply and the ground, and a control port of the electronic control switch Q 10 is connected to a data port of the corresponding central control module; a key module is connected to the data port of the primary unit central control module and the data port of the secondary unit central control module respectively, wherein the key module comprises a key switch S 1 , a key switch S 2 , a key switch S 3 , a key switch S 4 , a key switch S 5 , a key switch S 6 , a key switch S 7 , and a key switch S 8 , and the key switch S 1 , the key switch S 2 , the key switch S 3 , the key switch S 4 , the key switch S 5 , the key switch S 6 , the key switch S 7 , and the key switch S 8 are connected between the data port of the corresponding central control module and ground, respectively; a buzzer module is connected to the data port of the primary unit central control module and the data port of the secondary unit central control module respectively, wherein the buzzer module comprises a buzzer and an electronic control switch Q 12 , the buzzer and the electronic control switch Q 12 are connected in series between the positive power supply and ground, and a control port of the electronic control switch Q 12 is connected to a data port of the corresponding central control module; and a work indicator module is connected to the data port of the primary unit central control module and the data port of the secondary unit central control module respectively, wherein the work indicator module comprises a current limiting resistor R 30 , a current limiting resistor R 31 , a current limiting resistor R 32 , an electronic control switch Q 9 , an indicator light LED 1 , an indicator light LED 2 , and an indicator light LED 3 , the current limiting resistor R 32 and the indicator light LED 1 are connected in series, the current limiting resistor R 31 and the indicator light LED 2 are connected in series, the current limiting resistor R 30 and the indicator light LED 3 are connected in series, the series-connected current limiting resistor R 32 and the indicator light LED 1 , the series-connected current limiting resistor R 31 and the indicator light LED 2 , and the series-connected current limiting resistor R 30 and the indicator light LED 3 are connected in parallel and are connected between the positive power supply and ground via the electronic control switch Q 9 , and a control port of the electronic control switch Q 9 is connected to a data port of the corresponding central control module.
  9. 9 . The underground cable path tester according to claim 1 , wherein the primary unit power module comprises a primary unit USB interface, a primary unit charging management module, a primary unit lithium battery, and a primary unit power management device, the primary unit USB interface is connected to a power input port of the primary unit charging management module, the primary unit lithium battery is connected to a power output port of the primary unit charging management module, and the primary unit lithium battery is charged via the primary unit USB interface; a positive electrode of the primary unit lithium battery is connected with a primary unit battery voltage detection module, the primary unit battery voltage detection module comprises two resistors connected in series, and a common end between two resistors is connected to a data port of the primary unit central control module; when the first signal processing device is the signal transmitting module, a positive electrode of the secondary unit lithium battery is connected with a secondary unit battery voltage detection module, the secondary unit battery voltage detection module comprises two resistors connected in series, and a common end between two resistors is connected to a data port of the secondary unit central control module; when the first signal processing device is a signal transmitting module, the primary unit power management device comprises a primary unit boost chip U 105 and a primary unit voltage regulator chip U 104 , a power input port of the primary unit boost chip U 105 is connected to the primary unit lithium battery, a voltage of the primary unit lithium battery is converted to +9.0V for power supply via the primary unit boost chip U 105 , and +9.0V voltage is regulated to +3.3V via the primary unit voltage regulator chip U 104 and then output to the primary unit for power supply; and when the first signal processing device is the signal processing module, the primary unit power management device comprises a primary unit power management module and a voltage regulator module.
  10. 10 . The underground cable path tester according to claim 1 , wherein: the secondary unit power module comprises a secondary unit USB interface, a secondary unit charging management module, a secondary unit lithium battery, and a secondary unit power management device, the secondary unit USB interface is connected to a power input port of the secondary unit charging management module, the secondary unit lithium battery is connected to a power output port of the secondary unit charging management module, and the secondary unit lithium battery is charged via the secondary unit USB interface; when the first signal processing device is a signal transmitting module, the secondary unit power management device comprises an MOSFET chip Q 106 , a secondary unit boost chip U 102 , a first secondary unit voltage regulator chip U 114 , and a second secondary unit voltage regulator chip U 116 , a power input port of the secondary unit boost chip U 102 is connected to the secondary unit lithium battery via the MOSFET chip Q 106 , a voltage of the secondary unit lithium battery is converted to +9.0V for power supply via the secondary unit boost chip U 102 , +9.0V voltage is regulated to +5.0V via the first secondary unit voltage regulator chip U 114 and then output to the secondary unit for power supply, and a voltage of the secondary unit lithium battery is regulated to +3.3V via the second secondary unit voltage regulator chip U 116 and then output to the secondary unit for power supply; and when the first signal processing device is the signal processing module, the secondary unit power management device comprises a secondary unit power management module.
  11. 11 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal processing module, the secondary unit further comprises a secondary unit charging indicator module, the secondary unit charging indicator module comprises a resistor R 209 and a light-emitting diode LED 1 -RED, and the resistor R 209 and the light-emitting diode LED 1 -RED are connected in series between a BTA_CHAR interface of a secondary unit charging management module and a positive power port of a USB interface.
  12. 12 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal processing module, the secondary unit power module further comprises a +9V battery, a switch SW 1 , a resistor R 210 , and a light-emitting diode LED are sequentially connected in series between a positive electrode and a negative electrode of the +9V battery, a switch SW 2 is connected between the negative electrode of the +9V battery and ground, the positive electrode of the +9V battery is connected to a source of an MOS transistor Q 208 , a drain of the MOS transistor Q 208 outputs a +9V power supply, a gate of the MOS transistor Q 208 is connected to a collector of a triode Q 209 via a resistor R 211 , an emitter of the triode Q 209 is grounded, a base of the triode Q 209 is connected to a common end between a resistor R 212 and a resistor R 213 , the resistor R 212 and the resistor R 213 are connected in series between the positive electrode of the +9V battery and ground, and a resistor R 214 and a light-emitting diode LED 2 -RED are connected in series between the positive electrode of the +9V battery and ground.
  13. 13 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal processing module, the primary unit further comprises a power-on indicator module, the power-on indicator module comprises a bi-color light-emitting diode LED 100 and an MOS transistor Q 210 , a gate of the MOS transistor Q 210 is connected to a BTA_CHAR interface of the primary unit charging management module, a source of the MOS transistor Q 210 is connected to a positive power port of a USB interface, a drain of the MOS transistor Q 210 is connected to one bi-color light-emitting diode LED 100 , and the other bi-color light-emitting diode LED 100 is connected to a +9V power supply.
  14. 14 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal processing module, the primary unit further comprises a switch SW 11 , an output port of the primary unit power management module is connected to a work indicator LED 11 via the switch SW 11 , and the work indicator LED 11 is connected to the signal transmitting module.
  15. 15 . The underground cable path tester according to claim 1 , wherein: when the first signal processing device is the signal processing module, the probe interface is grounded via a variable resistor VR 2 , a center tap of the variable resistor VR 2 is grounded via a capacitor C 205 , a resistor R 215 , and a capacitor C 206 sequentially connected in series, a resistor R 216 and a capacitor C 207 are connected in series between a +9V power supply and ground, a common end between the resistor R 216 and the capacitor C 207 is connected to a common end between the resistor R 215 and the capacitor C 206 , the capacitor C 205 and the resistor R 215 are connected to a base of a triode Q 211 , an emitter of the triode Q 211 is grounded via a resistor R 217 , a collector of the triode Q 211 is connected to a +9V power supply via a resistor R 218 , the collector of the triode Q 211 is connected to a port of a primary coil of an intermediate-frequency transformer TP 1 , an opposite port of the primary coil of the intermediate-frequency transformer TP 1 is connected to a +9V power supply, a port of a secondary coil of the intermediate-frequency transformer TP 1 is connected to a +9V power supply via a resistor R 219 , the same port thereof is further grounded via a resistor R 220 , an opposite port of the secondary coil of the intermediate-frequency transformer TP 1 is connected to a base of a triode Q 212 , an emitter of the triode Q 212 is grounded via a resistor R 221 , a collector of the triode Q 212 is connected to a port of a primary coil of the intermediate-frequency transformer TP 2 , an opposite port of the primary coil of the intermediate-frequency transformer TP 2 is connected to a +9V power supply, a capacitor C 208 is connected in parallel between two ports of the primary coil of the intermediate-frequency transformer TP 2 , a port of a secondary coil of the intermediate-frequency transformer TP 2 is grounded via a capacitor C 209 , the same port thereof is further connected to a base of a triode Q 213 via a resistor R 222 , an opposite port of the secondary coil of the intermediate-frequency transformer TP 2 is connected to a base of a triode Q 214 , an emitter of the triode Q 214 is grounded via a resistor R 223 , a collector of the triode Q 214 is connected to a +9V power supply via a resistor R 224 , a collector of the triode Q 213 is connected to a +9V power supply, an emitter of the triode Q 213 is connected to the amplifier module via a resistor R 225 , a resistor R 226 , and a diode D 3 connected in series, and the capacitor C 210 is connected in parallel to the series-connected resistor R 225 and the resistor R 226 .

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application claims the benefit of Chinese Patent Application Nos. 202323432162.6 filed on Dec. 15, 2023 and 202323452119.6 filed on Dec. 18, 2023. All the above are hereby incorporated by reference in their entirety. FIELD Disclosed in the present disclosure is an underground cable path finding device and particularly an underground cable path tester. BACKGROUND With the development of urbanization, all kinds of cables and pipelines are wired in a buried way, which renders the pipelines denser and more complex. Some cities have a long history of power grid construction, especially in some central and old urban areas, in which the medium and low-voltage power grid distribution capacity is insufficient. How to find out the path of age-old power grid cables has become a necessary consideration for power grid renovation and construction. Existing technology requires that the low-voltage power grid must not be electrified for cable path detection, and the instrument is bulky, requires multiple operators, and needs to find the ends of the target cable to determine the path, which undoubtedly brings certain limitations to the power grid renovation and construction. SUMMARY In view of the above mentioned deficiencies of the prior art in which ordinary cable path testers are unable to determine the path of a cable line in an electrified condition, provided in the present disclosure is an underground cable path tester, which adds a set frequency signal to the power grid and receives and amplifies it through a receiving probe, so as to test the path of underground cables. The technical solutions adopted by the present disclosure to solve the technical problems is as follows. An underground cable path tester, including a primary unit and a secondary unit, in which the primary unit includes a primary unit central control module, a first signal processing device, a second signal processing device, and a primary unit power module, the first signal processing device is connected to a data port of the primary unit central control module, the second signal processing device is connected to an output port of the first signal processing device, the primary unit power module is used to supply power for the primary unit, the second signal processing device is a signal transmitting interface when the first signal processing device is a signal transmitting module, and the second signal processing device is a signal emitting module when the first signal processing device is a signal processing module;the secondary unit includes a secondary unit processing device and a secondary unit power module, the secondary unit processing device includes a first secondary unit processing device or a second secondary unit processing device, the first secondary unit processing device corresponds to the signal transmitting module, and the second secondary unit processing device corresponds to the signal processing module;the first secondary unit processing device includes a secondary unit central control module, a signal receiving module, a signal amplifying module, and a phase-locked loop module, the signal receiving module is connected to the signal amplifying module, an output port of the signal amplifying module is connected to the phase-locked loop module, and the phase-locked loop module is connected to a data port of the secondary unit central control module;the second secondary unit processing device includes a probe interface, a filter module, an amplifier module, and an alarm module, the probe interface is connected to an input port of the filter module, an output port of the filter module is connected to an input port of the amplifier module, and the output port of the amplifier module is connected to an input port of the alarm module; andthe secondary unit power module is used to supply power for the secondary unit. The technical solutions adopted by the present disclosure to solve its technical problems further include: when the first signal processing device is the signal transmitting module, the first signal processing device includes a dual-D flip-flop U6, an operational amplifier U7, an electronic switch U108, a triode Q11, a triode Q13, and an isolation transformer TR1, an interior of the dual-D flip-flop U6 includes a D flip-flop U6-A and a D flip-flop U6-B, an interior of the operational amplifier U7 includes an operational amplifier U7-A and an operational amplifier U7-B, a data port of the central control module is connected to an input port of the D flip-flop U6-B, an output port of the D flip-flop U6-B is connected to an input port of the D flip-flop U6-A, an output port of the D flip-flop U6-A is connected to an input port of the operational amplifier U7-A, an output port of the operational amplifier U7-A is connected to an I/O port B of the electronic switch U108, the I/O port B of the electronic switch U108 is connected to an I/O port A of the electronic switch U108, th