Equipment for detecting buried pipeline path

Abstract

The invention discloses equipment for detecting a buried pipeline path. The equipment comprises a signal unit and a receiving unit, the signal unit comprises a signal microprocessor, a D / A converter and an amplifier, the signal microprocessor, the D / A converter and the amplifier are electrically connected in sequence, and initial phases of sinusoidal signals are completely consistent when the signal unit sends out signals; the receiving unit comprises a horizontal coil and a vertical coil, the horizontal coil and the vertical coil are connected with a receiving microprocessor through an amplifying circuit and an A / D converter respectively, and the receiving microprocessor is connected with a displayer. According to the invention, detection operation can be completed by using two horizontal coils and one vertical coil; when signals are sent, the initial phases of sinusoidal signals at each time are completely consistent; compared with the existing continuous or intermittent sinusoidal signals, signal interference can be avoided to the greatest extent; therefore, the buried pipeline path detection can be completed through simplified equipment and relatively simple implementation of line hardware and software algorithms, so that the production cost and the use cost are reduced.

Description

Technical Field

[0001] The present invention belongs to the field of buried pipeline detection, and more particularly to a device for detecting the path of buried pipelines. Background Art

[0002] Traditional devices for finding the path of buried pipelines generally include a signal source and a receiver. The principle is that the signal source is connected to one end of the buried pipeline, and the receiver is used to receive the electromagnetic wave signal radiated by the buried pipeline on the ground to judge the direction and burial depth of the buried pipeline, as well as other spatial information of the pipeline. In the currently most used devices for detecting the path of buried pipelines, the output signal of the signal source is a continuous or intermittent sine wave signal with a frequency less than 100Khz (the starting phase of the intermittent signal is random or the continuous signal has only one starting phase when powered on). The receiver judges the pipeline depth and direction through at least 5 electromagnetic sensors after signal processing, where the direction includes left-right deviation indication and forward-backward indication. The implementation of the circuit hardware and software algorithms is relatively complex. Summary of the Invention

[0003] The present invention provides a device for detecting the path of buried pipelines to solve the defects in the prior art.

[0004] The present invention is realized through the following technical solutions:

[0005] A device for detecting the path of buried pipelines includes a signal unit and a receiving unit; the signal unit includes a signal microprocessor, a D / A converter, and an amplifier, which are electrically connected in sequence. When the signal unit emits a signal, the starting phase of each sine signal is completely the same; the receiving unit includes a horizontal coil and a vertical coil, and the horizontal coil and the vertical coil are respectively connected to a receiving microprocessor through an amplifier circuit and an A / D converter, and the receiving microprocessor is connected to a display.

[0006] In the device for detecting the path of buried pipelines as described above, the number of the horizontal coils is two, and the number of the vertical coils is one.

[0007] In the device for detecting the path of buried pipelines as described above, the calculation formula for the vertical component of the magnetic induction intensity of the signal unit is: where h is the burial depth of the pipeline, i is the alternating current with an angular frequency of ω and a carrier current, and its expression is: i = I0e -iωt .

[0008] In the device for detecting the path of buried pipelines as described above, the calculation formula for the horizontal component of the magnetic induction intensity of the signal unit is: where h is the burial depth of the pipeline, i is the current-carrying current which is an alternating current with an angular frequency of ω, and its expression is: i = I0e -iωt .

[0009] For a device for detecting the path of an underground pipeline as described above, the signal unit and the receiving unit operate in the measurement of the direction of the underground pipeline as follows: when the horizontal coil is above the pipeline, the magnetic induction intensity is the largest; when the horizontal coil is on both sides of the pipeline, the magnetic induction intensities are symmetrical and gradually decrease, and the place where the magnetic induction intensity is the largest is the direction of the underground pipeline.

[0010] For a device for detecting the path of an underground pipeline as described above, the signal unit and the receiving unit operate in the measurement of the direction of the underground pipeline as follows: when the horizontal coil is above the pipeline, the magnetic induction intensity is the smallest; when the horizontal coil is on both sides of the pipeline, the magnetic induction intensities are symmetrical and gradually increase, and the place where the magnetic induction intensity is the smallest is the direction of the underground pipeline.

[0011] For a device for detecting the path of an underground pipeline as described above, the signal unit and the receiving unit operate in the judgment of the left-right direction of the underground pipeline as follows: when the vertical coil is on the left and right sides of the pipeline direction, the phases of the sine signals induced and output by the vertical coil are completely opposite, and accordingly, the left-right position of the vertical coil in the underground pipeline can be judged.

[0012] For a device for detecting the path of an underground pipeline as described above, the signal unit and the receiving unit operate in the judgment of the forward-backward direction of the underground pipeline as follows: when any one of the two horizontal coils is reversed by 180°, the phases of the sine signals induced and output by the horizontal coil are completely opposite, and accordingly, the direction during detection can be judged.

[0013] For a device for detecting the path of an underground pipeline as described above, the signal unit and the receiving unit operate in the measurement of the burial depth of the underground pipeline as follows: for two horizontal coils with exactly the same parameters, when they are parallel to the horizontal plane and at a 90° angle to the pipeline direction directly above the pipeline, the functional relationships of their induced electromotive forces are respectively:

[0014]

[0015] where h1 and h2 are the distances from the two horizontal coils to the pipeline respectively, d is the distance between the two horizontal coils, and by taking the amplitudes of the induced electromotive forces of the two horizontal coils, the following expression can be obtained:

[0016]

[0017] h2 - h1 = d

[0018] Therefore, the expressions for the depths h1 or h2 are:

[0019]

[0020] The advantages of the present invention are as follows: The present invention can complete the detection operation by using two horizontal coils and one vertical coil, and when the present invention emits a signal, the starting phase of each sine signal is exactly the same, which can avoid signal interference to the greatest extent compared with the existing continuous or intermittent sine wave signals. Therefore, the present invention can complete the detection of the buried pipeline path through simplified equipment, relatively simple implementation circuit hardware and software algorithms, thereby reducing the production cost and usage cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the signal unit of the present invention;

[0023] Figure 2 It is a schematic diagram of the sine wave signal output by the signal unit of the present invention (T1 is the duration of the sine wave signal, T2 is the intermittent interval time, and the starting phase of each sine signal is exactly the same);

[0024] Figure 3 It is a schematic structural diagram of the receiving unit of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the horizontal coil and vertical coil of the present invention;

[0026] Figure 5 It is a schematic diagram of the magnetic induction intensity detection of the present invention;

[0027] Figure 6 It is one of the schematic diagrams of the buried pipeline path measurement of the present invention;

[0028] Figure 7 It is the second schematic diagram of the buried pipeline path measurement of the present invention;

[0029] Figure 8 It is a schematic diagram of the buried depth measurement of the buried pipeline of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0031] An apparatus for detecting the path of underground pipelines includes a signal unit (as Figure 1 shown) and a receiving unit (as Figure 3 shown); the signal unit includes a signal microprocessor, a D / A converter, and an amplifier, which are electrically connected in sequence. When the signal unit emits a signal, the starting phase of each sine signal is exactly the same (as Figure 2 shown); the receiving unit includes a horizontal coil and a vertical coil. The horizontal coil and the vertical coil are respectively connected to a receiving microprocessor through an amplifier circuit and an A / D converter, and the receiving microprocessor is connected to a display.

[0032] As Figure 4 shown, specifically, the number of the horizontal coils in this embodiment is two, and the number of the vertical coils is one.

[0033] As Figure 5 shown, specifically, the calculation formula for the vertical component of the magnetic induction intensity of the signal unit in this embodiment is: where h is the burial depth of the pipeline, i is the current-carrying current, which is an alternating current with an angular frequency of ω, and its expression is: i = I0e -iωt .

[0034] As Figure 5 shown, more specifically, the calculation formula for the horizontal component of the magnetic induction intensity of the signal unit in this embodiment is: where h is the burial depth of the pipeline, i is the current-carrying current, which is an alternating current with an angular frequency of ω, and its expression is: i = I0e -iωt .

[0035] As Figure 6 shown, still more specifically, the operation of the signal unit and the receiving unit in measuring the direction of the underground pipeline is as follows: the magnetic induction intensity is the largest when the horizontal coil is above the pipeline, and the magnetic induction intensity is symmetric and gradually decreases when the horizontal coil is on both sides of the pipeline. The place where the magnetic induction intensity is the largest is the direction of the underground pipeline.

[0036] As Figure 7As shown in the figure, further, during the operation of measuring the underground pipeline route by the signal unit and the receiving unit in this embodiment: when the horizontal coil is above the pipeline, the magnetic induction intensity is the smallest; when the horizontal coil is on both sides of the pipeline, the magnetic induction intensities are symmetrical and gradually increase. The place with the smallest magnetic induction intensity is the route of the underground pipeline.

[0037] As Figure 7 shown in the figure, furthermore, during the operation of judging the left - right direction of the underground pipeline by the signal unit and the receiving unit in this embodiment: when the vertical coil is on the left and right sides of the pipeline route, the phases of the sine signals induced and output by the vertical coil are completely opposite. Based on this, the left - right position of the vertical coil relative to the underground pipeline can be judged.

[0038] As Figure 6 shown in the figure, even further, during the operation of judging the forward - backward direction of the underground pipeline by the signal unit and the receiving unit in this embodiment: when any one of the two horizontal coils is reversed by 180°, the phases of the sine signals induced and output by the horizontal coil are completely opposite. Based on this, the direction during detection can be judged.

[0039] As Figure 8 shown in the figure, still further, during the operation of measuring the buried depth of the underground pipeline by the signal unit and the receiving unit in this embodiment: for two horizontal coils with exactly the same parameters, when they are parallel to the horizontal plane and form a 90° angle with the pipeline route directly above the pipeline, the functional relationships of their induced electromotive forces are respectively:

[0040]

[0041] where h1 and h2 are the distances from the two horizontal coils to the pipeline respectively, and d is the distance between the two horizontal coils. By taking the amplitudes of the induced electromotive forces of the two horizontal coils, the following expression can be obtained:

[0042]

[0043] h2 - h1 = d

[0044] Therefore, the expressions for the depth h1 or h2 are:

[0045]

[0046] In summary, the present invention can complete the detection of the underground pipeline path through a relatively simple structure, thereby reducing the production cost of the detection equipment for the underground pipeline path, and facilitating its wide promotion and application.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for detecting the path of underground pipelines, characterized in that: It includes a signal unit and a receiving unit; the signal unit includes a signal microprocessor, a D / A converter, and an amplifier, which are electrically connected in sequence. When the signal unit emits a signal, the starting phase of each sine signal is exactly the same; the receiving unit includes a horizontal coil and a vertical coil. The horizontal coil and the vertical coil are respectively connected to a receiving microprocessor through an amplifier circuit and an A / D converter, and the receiving microprocessor is connected to a display.

2. The device for detecting the path of buried pipelines according to claim 1, wherein: The number of the horizontal coils is two, and the number of the vertical coils is one.

3. The device for detecting the path of buried pipelines according to claim 1, characterized in that: The calculation formula for the vertical component of the magnetic induction intensity of the signal unit is as follows: where h is the burial depth of the pipeline, i is the current-carrying current, which is an alternating current with an angular frequency of ω, and its expression is: i = I0e -iωt .

4. The device for detecting the path of buried pipelines according to claim 1, characterized in that: The calculation formula for the horizontal component of the magnetic induction intensity of the signal unit described above is as follows: where h is the burial depth of the pipeline, and i is an alternating current with a current-carrying current and an angular frequency of ω, and its expression is: i = I0e -iωt .

5. The device for detecting the path of buried pipelines according to claim 1, characterized in that: The operation of the signal unit and the receiving unit in measuring the buried pipeline direction is as follows: when the horizontal coil is above the pipeline, the magnetic induction intensity is the largest; when the horizontal coil is on both sides of the pipeline, the magnetic induction intensity is symmetric and gradually decreases. The place with the largest magnetic induction intensity is the direction of the buried pipeline.

6. The device for detecting the path of buried pipelines according to claim 1, characterized in that: The operation of the signal unit and the receiving unit in measuring the buried pipeline direction is as follows: when the horizontal coil is above the pipeline, the magnetic induction intensity is the smallest; when the horizontal coil is on both sides of the pipeline, the magnetic induction intensity is symmetric and gradually increases. The place with the smallest magnetic induction intensity is the direction of the buried pipeline.

7. The device for detecting the path of buried pipelines according to claim 1, characterized in that: The operation of the signal unit and the receiving unit in judging the left-right direction of the buried pipeline is as follows: when the vertical coil is on the left and right sides of the pipeline direction, the phases of the sine signals induced and output by the vertical coil are exactly opposite. Based on this, the left-right position of the vertical coil in the buried pipeline can be judged.

8. The device for detecting the path of buried pipelines according to claim 2, characterized in that: The operation of the signal unit and the receiving unit in judging the forward-backward direction of the buried pipeline is as follows: when any one of the two horizontal coils is reversed by 180°, the phases of the sine signals induced and output by the horizontal coil are exactly opposite. Based on this, the direction during detection can be judged.

9. The device for detecting the path of buried pipelines according to claim 2, wherein: The operation of the signal unit and the receiving unit in measuring the buried depth of the pipeline is as follows: for two horizontal coils with exactly the same parameters, when they are parallel to the horizontal plane and form a 90° angle with the pipeline direction directly above the pipeline, the functional relationships of their induced electromotive forces are respectively: where h1 and h2 are the distances from the two horizontal coils to the pipeline respectively, and d is the distance between the two horizontal coils. By taking the amplitudes of the induced electromotive forces of the two horizontal coils, the following expression can be obtained: h2 - h1 = d Therefore, the expression for the depth h1 or h2:

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