A metal pipeline routing detection circuit

Abstract

The present disclosure provides a metal pipeline routing detection circuit, comprising: a signal generating unit, the signal generating unit includes: a first oscillation coil, the first oscillation coil is close to the metal pipeline, and the central axis of the first oscillation coil is parallel to the central axis of the metal pipeline; a signal receiving unit, the signal receiving unit includes: a second oscillation coil; an alarm unit, the input end of the alarm unit is connected to the output end of the signal receiving unit. In a metal pipeline routing detection circuit of the present disclosure, it can be determined that the second oscillation coil is close to the metal pipeline through the alarm information sent by the alarm unit, so as to accurately determine the routing of the metal pipeline, avoid the problem of random excavation, not only effectively reduce the maintenance cost and maintenance risk, but also greatly improve the maintenance efficiency.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pipeline detection, and in particular to a metal pipeline direction detection circuit. Background Art

[0002] Metal pipes are usually buried underground, in walls, etc. When inspecting and repairing metal pipes, it is necessary to dig on the ground, walls, etc. to expose the metal pipes to the outside, so as to facilitate the determination of the fault point and repair the fault point. However, when digging on the ground, walls, etc., people often dig based on experience and cannot accurately determine the location of the metal pipes, resulting in random digging, which not only causes chaos at the maintenance site, increases the maintenance cost and risk, but also greatly reduces the maintenance efficiency. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an object of the present disclosure is to provide a metal pipeline direction detection circuit.

[0005] To achieve the above-mentioned purpose, the present disclosure provides a metal pipeline direction detection circuit, comprising: a signal generating unit, the signal generating unit comprising: a first oscillation coil, the first oscillation coil is close to the metal pipeline, and the central axis of the first oscillation coil is parallel to the central axis of the metal pipeline; a signal receiving unit, the signal receiving unit comprising: a second oscillation coil; an alarm unit, the input end of the alarm unit is connected to the output end of the signal receiving unit; wherein, when the first oscillation coil and the second oscillation coil are within a first distance to a second distance, and the second oscillation coil is close to the metal pipeline, the first oscillation coil and the second oscillation coil are coupled through the metal pipeline, and the alarm unit sends an alarm message.

[0006] Optionally, the signal generating unit further includes: a first DC power supply, the negative electrode of which is grounded; a first resistor, the second end of which is connected to the positive electrode of the first DC power supply; an iron core inductor, the second end of which is connected to the first end of the first resistor; a first capacitor, the first end of which is connected to the first end of the iron core inductor, and the second end of which is connected to the third end of the first oscillation coil; a first triode, which is a PNP type, the base of which is grounded, the emitter of which is connected to the first end of the first capacitor, and the collector of which is connected to the first end of the first oscillation coil; a second capacitor, the first end of which is connected to the base of the first triode, and the second end of which is connected to the second end of the first oscillation coil and is grounded; a third capacitor, the first end of which is connected to the first end of the first oscillation coil, and the second end of which is connected to the second end of the first oscillation coil.

[0007] Optionally, the third capacitor is a variable capacitor.

[0008] Optionally, the signal generating unit further includes: a second DC power supply, the negative electrode of which is connected to the second end of the second capacitor, the positive electrode of which is grounded, and the second DC power supply is connected in series with the second capacitor, the third capacitor and the first oscillation coil.

[0009] Optionally, the signal receiving unit further includes: a first frequency down-converting unit, the input end of which is connected to the output end of the second oscillation coil; a second frequency down-converting unit, the input end of which is connected to the output end of the first frequency down-converting unit; a third frequency down-converting unit, the input end of which is connected to the output end of the second frequency down-converting unit, and the output end of which is connected to the input end of the alarm unit; a third DC power supply, the output end of which is connected to the input ends of the first frequency down-converting unit, the second frequency down-converting power supply and the third frequency down-converting unit.

[0010] Optionally, the first frequency down-conversion unit includes: a fourth capacitor, a first end of the fourth capacitor is connected to a first end of the second oscillation coil, and a second end of the fourth capacitor is connected to a second end of the second oscillation coil and a positive electrode of the third DC power supply; a fifth capacitor, a first end of the fifth capacitor is connected to the first end of the fourth capacitor; a third resistor, a first end of the third resistor is connected to a negative electrode of the third DC power supply, and a second end of the third resistor is connected to a second end of the fifth capacitor; a sixth capacitor, a first end of the sixth capacitor is connected to a third end of the second oscillation coil; a second resistor, a first end of the second resistor is connected to the negative electrode of the third DC power supply, and a second end of the second resistor is connected to a second end of the sixth capacitor; a second triode, the second triode is of PNP type, a base of the second triode is connected to the second end of the sixth capacitor, a collector of the second triode is connected to the second end of the fifth capacitor, an emitter of the second triode is connected to the positive electrode of the third DC power supply, and the collector of the second triode is connected to an input end of the second frequency down-conversion unit.

[0011] Optionally, the fourth capacitor is a variable capacitor.

[0012] Optionally, the second frequency down-conversion unit includes: a seventh capacitor, a first end of the seventh capacitor is connected to the collector of the second triode; a diode, an anode of the diode is connected to a second end of the seventh capacitor; a fourth resistor, a first end of the fourth resistor is connected to a cathode of the diode, and a second end of the fourth resistor is connected to the positive electrode of the third DC power supply; an eighth capacitor, a first end of the eighth capacitor is connected to the cathode of the diode; a fifth resistor, a first end of the fifth resistor is connected to the negative electrode of the third DC power supply, and a second end of the fifth resistor is connected to a second end of the eighth capacitor; a sixth resistor, a first end of the sixth resistor is connected to the negative electrode of the third DC power supply; a third triode, the third triode is of PNP type, a base of the third triode is connected to the second end of the eighth capacitor, a collector of the third triode is connected to a second end of the sixth resistor, an emitter of the third triode is connected to the positive electrode of the third DC power supply, and the collector of the third triode is connected to an input end of the third frequency down-conversion unit.

[0013] Optionally, the third frequency down-conversion unit includes: a ninth capacitor, the first end of which is connected to the collector of the third triode; a seventh resistor, the first end of which is connected to the negative pole of the third DC power supply, and the second end of which is connected to the second end of the ninth capacitor; a tenth capacitor, the first end of which is connected to the negative pole of the third DC power supply, and the first end and the second end of which are connected to the input end of the alarm unit; a fourth triode, which is a PNP type, the base of which is connected to the second end of the ninth capacitor, the collector of which is connected to the second end of the tenth capacitor, and the emitter of which is connected to the positive pole of the third DC power supply.

[0014] Optionally, the alarm unit includes: a headset, the first end of which is connected to the first end of the tenth capacitor, and the second end of which is connected to the second end of the tenth capacitor.

[0015] The technical solution provided by the present disclosure may include the following beneficial effects:

[0016] Through the alarm information sent by the alarm unit, it can be judged that the second oscillation coil is close to the metal pipeline, so as to accurately judge the direction of the metal pipeline, avoid the problem of random digging and prying, not only effectively reduce the maintenance cost and maintenance risk, but also greatly improve the maintenance efficiency.

[0017] The additional aspects and advantages of the present disclosure will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, in which:

[0019] Figure 1 is a schematic circuit diagram of a metal pipeline direction detection circuit proposed in an embodiment of the present disclosure;

[0020] Figure 2 is a schematic circuit diagram of a signal sending unit in a metal pipeline direction detection circuit proposed in an embodiment of the present disclosure;

[0021] Figure 3 is a schematic circuit diagram of a signal receiving unit in a metal pipeline direction detection circuit proposed in an embodiment of the present disclosure;

[0022] Figure 4 is a schematic structural diagram of a metal pipeline in a metal pipeline direction detection circuit proposed in an embodiment of the present disclosure;

[0023] As shown in the figure: 1. Signal generating unit, 2. Signal receiving unit, 3. Alarm unit, 4. Metal pipeline;

[0024] R1, a first resistor, R2, a second resistor, R3, a third resistor, R4, a fourth resistor, R5, a fifth resistor, R6, a sixth resistor, and R7, a seventh resistor;

[0025] C1, a first capacitor, C2, a second capacitor, C3, a third capacitor, C4, a fourth capacitor, C5, a fifth capacitor, C6, a sixth capacitor, C7, a seventh capacitor, C8, an eighth capacitor, C9, a ninth capacitor, and C10, a tenth capacitor;

[0026] BG1, the first triode, BG2, the second triode, BG3, the third triode, BG4, the fourth triode;

[0027] L1, the first oscillation coil, L2, the second oscillation coil, L3, the iron core inductor;

[0028] DC1, first DC power supply; DC2, second DC power supply; DC3, third DC power supply;

[0029] SW1, the first switch, SW2, the second switch, SW3, the third switch;

[0030] BE, headphones, VD, diode. DETAILED DESCRIPTION

[0031] Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0032] like Figure 1 As shown, the embodiment of the present disclosure proposes a metal pipe 4 direction detection circuit, including a signal generating unit 1, a signal receiving unit 2 and an alarm unit 3, the signal generating unit 1 includes: a first oscillation coil L1, the first oscillation coil L1 is close to the metal pipe 4, and the central axis of the first oscillation coil L1 is parallel to the central axis of the metal pipe 4, the signal receiving unit 2 includes: a second oscillation coil L2, the input end of the alarm unit 3 is connected to the output end of the signal receiving unit 2, wherein, when the first oscillation coil L1 and the second oscillation coil L2 are within a first distance to a second distance, and the second oscillation coil L2 is close to the metal pipe 4, the first oscillation coil L1 and the second oscillation coil L2 are coupled through the metal pipe 4, and the alarm unit 3 sends out an alarm message.

[0033] It can be understood that when the first oscillation coil L1 of the signal generating unit 1 is close to the metal pipe 4 and the central axis of the first oscillation coil L1 is parallel to the central axis of the metal pipe 4, the metal pipe 4 can be coupled with the first oscillation coil L1, and when the second oscillation coil L2 of the signal receiving unit 2 is at an appropriate distance from the first oscillation coil L1 and close to the metal pipe 4, it can be coupled with the metal pipe 4, thereby, the first oscillation coil L1 and the second oscillation coil L2 need to be attached to the metal pipe 4 for coupling within a certain distance range, and when the first oscillation coil L1 and the second oscillation coil L2 are coupled, the second oscillation coil L2 outputs a signal to the alarm unit 3, so that the alarm unit 3 sends an alarm message.

[0034] Therefore, the alarm information sent by the alarm unit 3 can be used to determine that the second oscillation coil L2 is close to the metal pipeline 4, so as to accurately determine the direction of the metal pipeline 4 and avoid the problem of random digging. This not only effectively reduces the maintenance cost and maintenance risk, but also greatly improves the maintenance efficiency.

[0035] It should be noted that the metal pipeline 4 can be an electric cable, a heating pipeline, a water supply pipeline, a gas supply pipeline, etc., and is not limited here.

[0036] The first oscillation coil L1 is provided with an iron core, while the second oscillation coil L2 is not provided with an iron core. The number of turns of the first oscillation coil L1 can be set according to actual needs, for example, 20 turns, and the number of turns of the second oscillation coil L2 can be set according to actual needs, for example, 42 turns.

[0037] The first oscillation coil L1 is used to emit a signal of a fixed frequency, and the second oscillation coil L2 is used to receive the signal of the frequency. When the first oscillation coil L1 and the second oscillation coil L2 are within a first distance, due to the small distance, the first oscillation coil L1 and the second oscillation coil L2 can be directly coupled without being attached to the metal pipe 4; when the first oscillation coil L1 and the second oscillation coil L2 are outside the first distance and within the second distance, the first oscillation coil L1 and the second oscillation coil L2 need to be attached to the metal pipe 4 for coupling; when the first oscillation coil L1 and the second oscillation coil L2 are outside the second distance, due to the large distance, the first oscillation coil L1 and the second oscillation coil L2 cannot be coupled even through the metal pipe 4.

[0038] The specific sizes of the first distance and the second distance can be set according to actual needs and are not limited here.

[0039] In specific use, such as Figure 4 As shown, firstly, the first oscillation coil L1 of the signal generating unit 1 is placed on a known portion of the metal pipe 4, such as Figure 4Point A in the figure, the known part can be a faucet, a water meter, a valve, etc., and the central axis of the first oscillation coil L1 must be parallel to the central axis of the metal pipe 4, and the signal generating unit 1 is turned on at the same time;

[0040] Then, the second oscillation coil L2 of the signal receiving unit 2 is placed at a certain distance from the first oscillation coil L1, the distance being greater than the first distance and less than the second distance, and the second oscillation coil L2 is moved along a circle with the distance as a radius until the alarm unit 3 issues an alarm message, indicating that the second oscillation coil L2 is close to the metal pipe 4. Figure 4 Point B in the figure, thereby gradually increasing the distance between the second oscillation coil L2 and the first oscillation coil L1, and determining the direction of the metal pipeline 4 in turn according to the above method, such as Figure 4 Points C and D in the figure;

[0041] If the distance between the second oscillation coil L2 and the first oscillation coil L1 is greater than the second distance, the first oscillation coil L1 can be moved to a position such as Figure 4 The point B, point C or point D in the figure is then determined in sequence according to the above method to determine the direction of the metal pipeline 4, thereby finally determining the route of the metal pipeline 4.

[0042] Among them, within the first distance and the second distance, the more detection points there are, the more accurate the detection of the direction of the metal pipe 4 will be. The specific number of detection points can be set according to actual needs and is not limited here.

[0043] like Figure 2 As shown, in some embodiments, the signal generating unit 1 further includes a first DC power supply DC1, a first resistor R1, an iron core inductor L3, a first capacitor C1, a first transistor BG1, a second capacitor C2 and a third capacitor C3, the negative electrode of the first DC power supply DC1 is grounded, the second end of the first resistor R1 is connected to the positive electrode of the first DC power supply DC1, the second end of the iron core inductor L3 is connected to the first end of the first resistor R1, the first end of the first capacitor C1 is connected to the first end of the iron core inductor L3, the second end of the first capacitor C1 is connected to the third end of the first oscillation coil L1, and the first transistor BG1 is connected to the positive electrode of the first DC power supply DC1. The transistor BG1 is of PNP type, the base of the first transistor BG1 is grounded, the emitter of the first transistor BG1 is connected to the first end of the first capacitor C1, the collector of the first transistor BG1 is connected to the first end of the first oscillation coil L1, the first end of the second capacitor C2 is connected to the base of the first transistor BG1, the second end of the second capacitor C2 is connected to the second end of the first oscillation coil L1, the second end of the second capacitor C2 is grounded, the first end of the third capacitor C3 is connected to the first end of the first oscillation coil L1, and the second end of the third capacitor C3 is connected to the second end of the first oscillation coil L1.

[0044] It can be understood that through the charging and discharging of the first capacitor C1, the second capacitor C2, and the third capacitor C3, the first triode BG1 continuously switches between conduction and cutoff, thereby converting the direct current supplied by the first DC power supply DC1 to the first oscillation coil L1 into alternating current, causing the first oscillation coil L1 to emit a signal with a fixed frequency to ensure the stable reception of the fixed-frequency signal by the signal receiving unit 2.

[0045] It should be noted that the specific type of the first DC power supply DC1 can be set according to actual needs. For example, the voltage of the first DC power supply DC1 can be 3V.

[0046] The specific resistance value of the first resistor R1 can be set according to actual needs. For example, the resistance value of the first resistor R1 can be 2kΩ.

[0047] The iron-core inductor L3 is used for filtering, and its specific type can be set according to actual needs. For example, the inductance value of the iron-core inductor L3 can be 4.5mH.

[0048] The specific capacitance values of the first capacitor C1, the second capacitor C2, and the third capacitor C3 can be set according to actual needs. For example, the capacitance value of the first capacitor C1 can be 0.2μF, the capacitance value of the second capacitor C2 can be 0.01μF, and the capacitance value of the third capacitor C3 can be 360pF. Among them, when the first oscillation coil L1 has 20 turns, the second end of the first capacitor C1 can be connected to the 10th turn of the first oscillation coil L1.

[0049] The PNP-type first triode BG1 includes a piece of N (Negative) type semiconductor and two pieces of P (Positive) type semiconductors. The N-type semiconductor is arranged between the two P-type semiconductors. The first triode BG1 includes a base, an emitter, and a collector. In the cutoff state, the emitter and the collector are disconnected, and in the conduction state, the emitter and the collector are conducting. Among them, the specific type of the first triode BG1 can be set according to actual needs. For example, the model of the first triode BG1 can be 3AG1, 3AG4, 3AG11-14, etc.

[0050] As Figure 2 shown, in some embodiments, the third capacitor C3 is a variable capacitor.

[0051] It can be understood that since the third capacitor C3 is connected in parallel with the first oscillation coil L1, when the capacitance of the third capacitor C3 is adjusted, the frequency of the first oscillation coil L1 changes, thereby realizing the frequency adjustment of the first oscillation coil L1, making the overall flexibility stronger and the versatility better.

[0052] It should be noted that a variable capacitor, also known as a variable condenser, is a capacitor whose capacitance can be adjusted within a certain range. The variable capacitor includes a set of fixed plates and a set of moving plates, and the capacitance of the variable capacitor can be continuously changed as the moving plates rotate.

[0053] As Figure 2 shown, in some embodiments, the signal generating unit 1 further includes a second DC power supply DC2. The negative pole of the second DC power supply DC2 is connected to the second end of the second capacitor C2, the positive pole of the second DC power supply DC2 is grounded, and the second DC power supply DC2 is connected in series with the second capacitor C2, the third capacitor C3, and the first oscillation coil L1.

[0054] It can be understood that by supplying power to the emitter and collector of the first triode BG1 through the first DC power supply DC1 and the second DC power supply DC2 respectively, the operation of the first triode BG1 becomes more stable, ensuring that the first oscillation coil L1 emits a signal with a fixed frequency more stably.

[0055] It should be noted that the specific type of the second DC power supply DC2 can be set according to actual needs. For example, the voltage of the second DC power supply DC2 can be 9V.

[0056] As Figure 2 shown, in some embodiments, the signal generating unit 1 further includes a first switch SW1 and a second switch SW2. The first end of the first switch SW1 is connected to the second end of the first resistor R1, the second end of the first switch SW1 is connected to the positive pole of the first DC power supply DC1, and the first switch SW1 is connected in series with the first resistor R1 and the first DC power supply DC1. The first end of the second switch SW2 is connected to the second end of the second capacitor C2, the second end of the second switch SW2 is connected to the negative pole of the second DC power supply DC2, and the second switch SW2 is connected in series with the second capacitor C2, the third capacitor C3, the first oscillation coil L1, and the second DC power supply DC2.

[0057] It can be understood that through the settings of the first switch SW1 and the second switch SW2, it is convenient to control the on-off of the output circuits of the first DC power supply DC1 and the second DC power supply DC2, thereby making the overall flexibility higher and the use more convenient.

[0058] It should be noted that the specific types of the first switch SW1 and the second switch SW2 can be set according to actual needs and are not limited here.

[0059] As Figure 3As shown, in some embodiments, the signal receiving unit 2 further includes a first frequency down-conversion unit, a second frequency down-conversion unit, a third frequency down-conversion unit, and a third DC power supply DC3. The input end of the first frequency down-conversion unit is connected to the output end of the second oscillation coil L2. The input end of the second frequency down-conversion unit is connected to the output end of the first frequency down-conversion unit. The input end of the third frequency down-conversion unit is connected to the output end of the second frequency down-conversion unit. The output end of the third frequency down-conversion unit is connected to the input end of the alarm unit 3. The output end of the third DC power supply DC3 is connected to the input ends of the first frequency down-conversion unit, the second frequency down-conversion power supply, and the third frequency down-conversion unit.

[0060] It can be understood that through the settings of the first frequency down-conversion unit, the second frequency down-conversion unit, and the third frequency down-conversion unit, not only can the signal receiving frequency of the second oscillation coil L2 be adapted to the signal frequency emitted by the first oscillation coil L1, ensuring the stable reception of the signal emitted by the first oscillation coil L1 by the second oscillation coil L2, but also the signal frequency received by the second oscillation coil L2 can be reduced in multiple stages, enabling the signal to be adapted to the alarm unit 3 and ensuring that the alarm unit 3 can stably emit alarm information.

[0061] As Figure 3 shown, in some embodiments, the signal generating unit 1 further includes a third switch SW3, and the third switch SW3 is connected in series with the third DC power supply DC3.

[0062] It can be understood that through the setting of the third switch SW3, it is convenient to control the on / off of the output circuit of the third DC power supply DC3, thereby making the overall flexibility higher and the use more convenient.

[0063] It should be noted that the specific type of the third switch SW3 can be set according to actual needs and is not limited herein.

[0064] As Figure 3As shown, in some embodiments, the first frequency-down unit includes a fourth capacitor C4, a fifth capacitor C5, a third resistor R3, a sixth capacitor C6, a second resistor R2, and a second triode BG2. The first end of the fourth capacitor C4 is connected to the first end of the second oscillation coil L2. The second end of the fourth capacitor C4 is connected to the second end of the second oscillation coil L2 and the positive pole of the third DC power supply DC3. The first end of the fifth capacitor C5 is connected to the first end of the fourth capacitor C4. The first end of the third resistor R3 is connected to the negative pole of the third DC power supply DC3. The second end of the third resistor R3 is connected to the second end of the fifth capacitor C5. The first end of the sixth capacitor C6 is connected to the third end of the second oscillation coil L2. The first end of the second resistor R2 is connected to the negative pole of the third DC power supply DC3. The second end of the second resistor R2 is connected to the second end of the sixth capacitor C6. The second triode BG2 is of PNP type. The base of the second triode BG2 is connected to the second end of the sixth capacitor C6. The collector of the second triode BG2 is connected to the second end of the fifth capacitor C5. The emitter of the second triode BG2 is connected to the positive pole of the third DC power supply DC3. The collector of the second triode BG2 is connected to the input end of the second frequency-down unit.

[0065] It can be understood that through the settings of the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6, the second oscillation coil L2 can receive the signal sent by the first oscillation coil L1 and send the signal to the second triode BG2. At the same time, the second resistor R2 and the third resistor R3 provide a bias voltage for the second triode BG2. Thus, the second triode BG2 can perform a first-level frequency-down on the signal sent by the second oscillation coil L2, ensuring that the signal sent by the second oscillation coil L2 can adapt to the alarm unit 3.

[0066] It should be noted that the specific capacitance values of the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 can be set according to actual needs. For example: the capacitance value of the fourth capacitor C4 can be 360 pF, the capacitance value of the fifth capacitor C5 can be 250 pF, and the capacitance value of the sixth capacitor C6 can be 6000 pF. Among them, when the second oscillation coil L2 has 42 turns, the first end of the sixth capacitor C6 can be connected to the 16th turn of the second oscillation coil L2.

[0067] The specific resistance values of the second resistor R2 and the third resistor R3 can be set according to actual needs. For example: the resistance value of the second resistor R2 can be 510 kΩ, and the resistance value of the third resistor R3 can be 2 kΩ.

[0068] The second PNP-type triode BG2 includes a block of N-type semiconductor and two blocks of P-type semiconductor. The N-type semiconductor is disposed between the two blocks of P-type semiconductor. The second triode BG2 includes a base, an emitter, and a collector. When in the cut-off state, the emitter and the collector are disconnected. When in the conducting state, the emitter and the collector are conducting. Among them, the specific type of the second triode BG2 can be set according to actual needs. For example, the model of the second triode BG2 can be 3AG1, etc.

[0069] As Figure 3 shown, in some embodiments, the fourth capacitor C4 is a variable capacitor.

[0070] It can be understood that since the fourth capacitor C4 is connected in parallel with the second oscillation coil L2, when the capacitance of the fourth capacitor C4 is adjusted, the receiving frequency of the second oscillation coil L2 changes. Thus, the frequency of the second oscillation coil L2 is adjusted, making the overall flexibility stronger and the versatility better.

[0071] As Figure 3 shown, in some embodiments, the second frequency-down conversion unit includes a seventh capacitor C7, a diode VD, a fourth resistor R4, an eighth capacitor C8, a fifth resistor R5, a sixth resistor R6, and a third triode BG3. The first end of the seventh capacitor C7 is connected to the collector of the second triode BG2. The anode of the diode VD is connected to the second end of the seventh capacitor C7. The first end of the fourth resistor R4 is connected to the cathode of the diode VD. The second end of the fourth resistor R4 is connected to the positive pole of the third DC power supply DC3. The first end of the eighth capacitor C8 is connected to the cathode of the diode VD. The first end of the fifth resistor R5 is connected to the negative pole of the third DC power supply DC3. The second end of the fifth resistor R5 is connected to the second end of the eighth capacitor C8. The first end of the sixth resistor R6 is connected to the negative pole of the third DC power supply DC3. The third triode BG3 is of PNP type. The base of the third triode BG3 is connected to the second end of the eighth capacitor C8. The collector of the third triode BG3 is connected to the second end of the sixth resistor R6. The emitter of the third triode BG3 is connected to the positive pole of the third DC power supply DC3. The collector of the third triode BG3 is connected to the input end of the third frequency-down conversion unit.

[0072] It can be understood that through the settings of the seventh capacitor C7 and the eighth capacitor C8, the third triode BG3 can receive the signal sent by the second triode BG2. At the same time, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 provide a bias voltage for the third triode BG3. Thus, the third triode BG3 can perform secondary frequency-down conversion on the signal sent by the second oscillation coil L2, ensuring that the signal sent by the second oscillation coil L2 can adapt to the alarm unit 3.

[0073] It should be noted that the specific capacitance values of the seventh capacitor C7 and the eighth capacitor C8 can be set according to actual needs. For example, the capacitance value of the seventh capacitor C7 can be 0.01 μF, and the capacitance value of the eighth capacitor C8 can be 10 μF.

[0074] The specific resistance value of the fourth resistor R4 can be set according to actual needs and is not limited here.

[0075] The specific resistance values of the fifth resistor R5 and the sixth resistor R6 can be set according to actual needs. For example, the resistance value of the fifth resistor R5 can be 470 kΩ, and the resistance value of the sixth resistor R6 can be 5 kΩ.

[0076] The diode VD is an electronic device made of semiconductor material, which has the property of unidirectional conduction. That is, when a forward voltage is applied to the anode of the diode VD, the diode VD conducts; when a reverse voltage is applied to the cathode of the diode VD, the diode VD cuts off. Among them, the specific type of the diode VD can be set according to actual needs and is not limited here.

[0077] The PNP-type third triode BG3 includes a block of N-type semiconductor and two blocks of P-type semiconductor. The N-type semiconductor is arranged between the two blocks of P-type semiconductor. The third triode BG3 includes a base, an emitter, and a collector. In the cut-off state, the emitter and the collector are disconnected; in the conduction state, the emitter and the collector are conducting. Among them, the specific type of the third triode BG3 can be set according to actual needs. For example, the model of the third triode BG3 can be 3AX71, etc.

[0078] As Figure 3 shown, in some embodiments, the third frequency-down unit includes a ninth capacitor C9, a seventh resistor R7, a tenth capacitor C10, and a fourth triode BG4. The first end of the ninth capacitor C9 is connected to the collector of the third triode BG3. The first end of the seventh resistor R7 is connected to the negative pole of the third DC power supply DC3. The second end of the seventh resistor R7 is connected to the second end of the ninth capacitor C9. The first end of the tenth capacitor C10 is connected to the negative pole of the third DC power supply DC3. The first end and the second end of the tenth capacitor C10 are connected to the input end of the alarm unit 3. The fourth triode BG4 is of PNP type. The base of the fourth triode BG4 is connected to the second end of the ninth capacitor C9. The collector of the fourth triode BG4 is connected to the second end of the tenth capacitor C10. The emitter of the fourth triode BG4 is connected to the positive pole of the third DC power supply DC3.

[0079] It can be understood that by setting the ninth capacitor C9, the fourth triode BG4 can receive the signal sent by the third triode BG3. At the same time, the seventh resistor R7 provides a bias voltage for the fourth triode BG4. Thus, the fourth triode BG4 can perform three-stage frequency reduction on the signal sent by the second oscillation coil L2, ensuring that the signal sent by the second oscillation coil L2 can adapt to the alarm unit 3.

[0080] Among them, by setting the tenth capacitor C10, the input signal of the alarm unit 3 is made more stable, ensuring the stable emission of alarm information.

[0081] It should be noted that the specific capacitance values of the ninth capacitor C9 and the tenth capacitor C10 can be set according to actual needs. For example, the capacitance value of the ninth capacitor C9 can be 10 μF, and the capacitance value of the tenth capacitor C10 can be 0.01 μF.

[0082] The specific resistance value of the seventh resistor R7 can be set according to actual needs. For example, the resistance value of the seventh resistor R7 can be 200 kΩ.

[0083] The PNP-type fourth triode BG4 includes a block of N-type semiconductor and two blocks of P-type semiconductor. The N-type semiconductor is arranged between the two blocks of P-type semiconductor. The fourth triode BG4 includes a base, an emitter, and a collector. In the cut-off state, the emitter and the collector are disconnected. In the conducting state, the emitter and the collector are conducting. Among them, the specific type of the fourth triode BG4 can be set according to actual needs. For example, the model of the fourth triode BG4 can be 3AX71, etc.

[0084] As Figure 3 shown, in some embodiments, the alarm unit 3 includes an earphone BE. The first end of the earphone BE is connected to the first end of the tenth capacitor C10, and the second end of the earphone BE is connected to the second end of the tenth capacitor C10.

[0085] It can be understood that the fourth triode BG4 sends the frequency-reduced output signal of the second oscillation coil L2 to the earphone BE so that the earphone BE emits a sound alarm message, thus better prompting the operator. At the same time, the earphone BE is convenient to wear and store, making the overall use more convenient.

[0086] It should be noted that the specific type of the earphone BE can be set according to actual needs and is not limited here.

[0087] In addition to the earphone BE, a light-emitting diode can also be set so that the alarm unit 3 can emit sound and light alarm messages.

[0088] In the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more than two.

[0089] Any process or method description shown in a flowchart or described otherwise herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present disclosure includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in an order opposite to that shown or discussed, according to the functions involved, which should be understood by those skilled in the technical field to which the embodiments of the present disclosure pertain.

[0090] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0091] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A metal pipeline routing detection circuit, characterized in that Including: A signal generating unit, the signal generating unit includes: a first oscillation coil, the first oscillation coil is close to the metal pipeline, and the central axis of the first oscillation coil is parallel to the central axis of the metal pipeline; A signal receiving unit, the signal receiving unit includes: a second oscillation coil; An alarm unit, the input end of the alarm unit is connected to the output end of the signal receiving unit; Wherein, when the first oscillation coil and the second oscillation coil are within a first distance to a second distance and the second oscillation coil is close to the metal pipeline, the first oscillation coil and the second oscillation coil are coupled through the metal pipeline, and the alarm unit issues an alarm message; The signal generating unit further includes: a first DC power supply, a first resistor, an iron core inductor, a first capacitor, a first triode, a second capacitor and a third capacitor. The negative pole of the first DC power supply is grounded, the second end of the first resistor is connected to the positive pole of the first DC power supply, the second end of the iron core inductor is connected to the first end of the first resistor, the first end of the first capacitor is connected to the first end of the iron core inductor, the second end of the first capacitor is connected to the third end of the first oscillation coil, the first triode is a PNP type, the base of the first triode is grounded, the emitter of the first triode is connected to the first end of the first capacitor, the collector of the first triode is connected to the first end of the first oscillation coil, the first end of the second capacitor is connected to the base of the first triode, the second end of the second capacitor is connected to the second end of the first oscillation coil, the first end of the second capacitor is grounded, the first end of the third capacitor is connected to the first end of the first oscillation coil, and the second end of the third capacitor is connected to the second end of the first oscillation coil; The signal receiving unit further includes: a first frequency down-converting unit, a second frequency down-converting unit, a third frequency down-converting unit and a third DC power supply. The input end of the first frequency down-converting unit is connected to the output end of the second oscillation coil, the input end of the second frequency down-converting unit is connected to the output end of the first frequency down-converting unit, the input end of the third frequency down-converting unit is connected to the output end of the second frequency down-converting unit, the output end of the third frequency down-converting unit is connected to the input end of the alarm unit, and the output end of the third DC power supply is connected to the input ends of the first frequency down-converting unit, the second frequency down-converting unit and the third frequency down-converting unit.

2. The metal pipeline routing detection circuit according to claim 1, wherein The third capacitor is a variable capacitor.

3. The metal pipeline routing detection circuit according to claim 1, characterized in that, The signal generating unit further includes: A second DC power supply, the negative pole of the second DC power supply is connected to the second end of the second capacitor, the positive pole of the second DC power supply is grounded, and the second DC power supply is connected in series with the second capacitor, the third capacitor and the first oscillation coil.

4. The metal pipeline routing detection circuit according to claim 1, characterized in that The first frequency down-converting unit includes: A fourth capacitor, the first end of the fourth capacitor is connected to the first end of the second oscillation coil, and the second end of the fourth capacitor is connected to the second end of the second oscillation coil and the positive pole of the third DC power supply; A fifth capacitor, the first end of the fifth capacitor is connected to the first end of the fourth capacitor; A third resistor, with the first end of the third resistor connected to the negative pole of the third DC power supply, and the second end of the third resistor connected to the second end of the fifth capacitor; A sixth capacitor, with the first end of the sixth capacitor connected to the third end of the second oscillation coil; A second resistor, with the first end of the second resistor connected to the negative pole of the third DC power supply, and the second end of the second resistor connected to the second end of the sixth capacitor; A second triode, which is a PNP type. The base of the second triode is connected to the second end of the sixth capacitor, the collector of the second triode is connected to the second end of the fifth capacitor, the emitter of the second triode is connected to the positive pole of the third DC power supply, and the collector of the second triode is connected to the input end of the second frequency-down conversion unit.

5. The metal pipeline routing detection circuit according to claim 4, characterized in that, The fourth capacitor is a variable capacitor.

6. The metal pipeline routing detection circuit according to claim 4, characterized in that, The second frequency-down conversion unit includes: A seventh capacitor, with the first end of the seventh capacitor connected to the collector of the second triode; A diode, with the anode of the diode connected to the second end of the seventh capacitor; A fourth resistor, with the first end of the fourth resistor connected to the cathode of the diode, and the second end of the fourth resistor connected to the positive pole of the third DC power supply; An eighth capacitor, with the first end of the eighth capacitor connected to the cathode of the diode; A fifth resistor, with the first end of the fifth resistor connected to the negative pole of the third DC power supply, and the second end of the fifth resistor connected to the second end of the eighth capacitor; A sixth resistor, with the first end of the sixth resistor connected to the negative pole of the third DC power supply; A third triode, which is a PNP type. The base of the third triode is connected to the second end of the eighth capacitor, the collector of the third triode is connected to the second end of the sixth resistor, the emitter of the third triode is connected to the positive pole of the third DC power supply, and the collector of the third triode is connected to the input end of the third frequency-down conversion unit.

7. The metal pipeline routing detection circuit according to claim 6, wherein The third frequency-down conversion unit includes: A ninth capacitor, with the first end of the ninth capacitor connected to the collector of the third triode; A seventh resistor, with the first end of the seventh resistor connected to the negative pole of the third DC power supply, and the second end of the seventh resistor connected to the second end of the ninth capacitor; A tenth capacitor, with the first end of the tenth capacitor connected to the negative pole of the third DC power supply, and the first end and the second end of the tenth capacitor connected to the input end of the alarm unit; A fourth triode, which is a PNP type. The base of the fourth triode is connected to the second end of the ninth capacitor, the collector of the fourth triode is connected to the second end of the tenth capacitor, and the emitter of the fourth triode is connected to the positive pole of the third DC power supply.

8. The metal pipeline routing detection circuit according to claim 7, characterized in that The alarm unit includes: A headphone, with the first end of the headphone connected to the first end of the tenth capacitor, and the second end of the headphone connected to the second end of the tenth capacitor.

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