Underground pipeline precision detector and detection method

Abstract

The invention belongs to the technical field of pipeline detection, and discloses an underground pipeline precision detector and detection method.The underground pipeline precision detector comprises a cart and further comprises trundles arranged at the bottom of the cart; the sweeping mechanism is arranged on the outer wall of the trolley; the detector shell is arranged on the outer wall of the top end of the cart through a mounting mechanism; the handle is arranged on the outer wall of the top end of the cart through a lifting mechanism; wherein the cleaning mechanism comprises a control rod, and the outer wall of the control rod is fixedly connected with a brush; through cooperation of the brush, the bevel gear set and other structures, the brush can be driven to do synchronous reciprocating motion when the cart is pushed, the brush can sweep sundries on the ground in the advancing direction of the cart, influences such as blocking of signals emitted by the detector shell are avoided, manual sweeping by an operator is not needed, and the working intensity is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline detection, and in particular relates to a precision detector for underground pipelines and a detection method. Background Art

[0002] The underground pipeline precision detector is a professional instrument used to accurately locate and detect various underground pipelines. It combines the technical principles of electromagnetic induction, radar detection, and sound wave detection. It can quickly determine the plane position, burial depth, direction, pipe diameter and other parameters of underground pipelines without damaging the ground. It has the characteristics of high detection accuracy, strong anti-interference ability, and convenient operation. It provides important data support for the planning, design, construction and safe operation of underground pipelines.

[0003] During the detection process, the pipeline detector needs to emit electromagnetic signals or current signals into the underground for detection. There may be a lot of debris on the ground outside. Metal debris itself is conductive and magnetic, which may interfere with the electromagnetic signal emitted by the detector, causing signal distortion, attenuation or false anomalies. Although non-metallic obstacles do not directly interfere with the electromagnetic signal, they will block the ground, affect the detector signal transmission, or change the signal incident angle, indirectly leading to a decrease in signal transmission efficiency. In some existing technologies, the operator is required to manually clean the debris in the direction of the detector's travel, which wastes manpower and time and improves work efficiency. Therefore, a precision underground pipeline detector and detection method are proposed to address the above problems. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides an underground pipeline precision detector and a detection method.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: an underground pipeline precision detector, comprising a cart and further comprising: Casters, the casters are arranged at the bottom of the cart; A cleaning mechanism, the cleaning mechanism being arranged on the outer wall of the cart; A detector housing, the detector housing being mounted on the top outer wall of the cart via a mounting mechanism; A push rod, the push rod being arranged on the top outer wall of the cart through a lifting mechanism; Wherein, the cleaning mechanism includes a control rod, and a brush is fixedly connected to the outer wall of the control rod; The mounting mechanism includes a mounting plate, the inner wall of which is elastically connected to a square block via an elastic member A; The lifting mechanism comprises a fixed rod, and the inner wall of the fixed rod is slidably connected to the moving rod.

[0006] Preferably, the top outer wall of the cart is fixedly connected to a fixed block, the outer wall of the caster is fixedly connected to a rotating rod, the outer wall of the rotating rod is fixedly connected to a synchronous wheel A, the outer wall of the synchronous wheel A is connected to the synchronous wheel B through a synchronous belt transmission, the outer wall of the synchronous wheel B is provided with a turntable through a bevel gear set, and the outer wall of the turntable is fixedly connected to a sliding rod.

[0007] Preferably, the synchronous wheel B is rotatably connected to the inner wall of the fixed block, and the sliding rod is in contact with the inner wall of the control rod.

[0008] Preferably, the bevel gear set includes two sets of bevel gears, one set of bevel gears is fixedly connected to the outer wall of the synchronous wheel B, and the other set of bevel gears is rotatably connected to the inner wall of the fixed block, and the bevel gears are fixedly connected to the outer wall of the turntable.

[0009] Preferably, the inner wall of the mounting plate is rotatably connected to a rotating wheel, the outer wall of the rotating wheel is wrapped with a pull rope, the outer wall of the mounting plate is fixedly connected to a handle, the outer wall of the handle is slidably connected to a partition, and the outer wall of the detector housing is provided with a groove.

[0010] Preferably, the mounting plate is fixedly connected to the top outer wall of the cart, one end of the pull rope is fixedly connected to the outer wall of the square block, and the other end of the pull rope is fixedly connected to the outer wall of the partition.

[0011] Preferably, one end of the elastic member A is fixedly connected to the outer wall of the square block, and the other end of the elastic member A is fixedly connected to the inner wall of the mounting plate. The square block is slidably connected to the inner wall of the mounting plate, and the square block is engaged with the groove.

[0012] Preferably, a slot is provided on the inner wall of the fixed rod, and two groups of wedge blocks are slidably connected to the inner wall of the movable rod. The two groups of wedge blocks are elastically connected by an elastic member B, and the outer wall of the wedge block is hinged to a pull rod through a hinged rod, and the outer wall of the pull rod is fixedly connected to a protrusion.

[0013] Preferably, the fixed rod is fixedly connected to the outer wall of the top end of the cart, the movable rod is fixedly connected to the outer wall of the push rod, the two ends of the elastic member B are respectively fixedly connected to two groups of wedge blocks, the two ends of the hinged rod are respectively hinged to the outer walls of the pull rod and the wedge blocks, and the protrusion passes through the outer wall of the movable rod.

[0014] This application also proposes a method for precise detection of underground pipelines, comprising the following steps: S1. Install the detector housing on a cart, push the cart to the detection area, and use the transmitter equipped with the detector housing to transmit an electromagnetic signal or current signal of a specific frequency underground, so that the signal propagates along the target pipeline and stimulates the pipeline to generate a secondary electromagnetic field; S2. Push the detector shell slowly along the preset route. The receiving device receives the secondary electromagnetic field signals generated by the underground pipeline due to induction excitation, as well as other electromagnetic signals in the surrounding environment in real time. The receiving device converts these electromagnetic signals into electrical signals and transmits them to the data acquisition module inside the instrument to collect signal strength and phase data information at different locations and depths. S3. The data processing system built into the detector shell analyzes and processes the large amount of collected data, using filtering, amplification, comparison and other algorithms to remove environmental interference signals and extract effective signal features related to the target pipeline; S4. Based on the effective signal, combined with the principle of electromagnetic induction and geometric positioning algorithm, the plane position, burial depth, direction and other parameters of the underground pipeline are calculated, and the detection results are intuitively presented through the display screen of the detector shell to accurately locate the underground pipeline.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention cooperates with structures such as a brush and a bevel gear set. When pushing the cart, the control rod can be driven to move back and forth continuously through the rotating rod, synchronous wheel A, synchronous wheel B, bevel gear set, turntable, etc., thereby driving the brush to move back and forth synchronously. The brush can clean debris on the ground in the direction of the cart's advance to avoid blocking the signal emitted by the detector housing, etc., and the operator does not need to clean manually, thereby reducing the workload. The present invention cooperates with the mounting plate and the square block. When the partition is pulled, the square block can be pulled toward the inner wall of the mounting plate by a pull rope. At this time, the detector housing can be removed for maintenance. The detector housing can also be installed in the mounting plate and fixed by engaging the square block with the groove. The operation is simple and convenient for operators. The present invention cooperates with structures such as a moving rod and a wedge block, and the setting of the lifting mechanism can facilitate the operator to adjust the height of the push rod to a more comfortable height to push the cart to move for detection. There is no need to adjust the position of the push rod by turning the bolt multiple times, which saves time and effort and improves the efficiency of the preparation work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic structural diagram of the cleaning mechanism of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the cart and the fixed block of the present invention; Figure 4 This is a cross-section diagram of the fixed block and the cleaning mechanism structure of the present invention; Figure 5 This is a cross-section of the mounting plate and a schematic diagram of the exploded structure of the detector housing of the present invention; Figure 6 This is a schematic diagram of the structure of the movable rod and the fixed rod after cross-section decomposition.

[0017] In the figure: 1. Cart; 2. Caster; 3. Cleaning mechanism; 301. Rotating rod; 302. Synchronous wheel A; 303. Synchronous belt; 304. Synchronous wheel B; 305. Bevel gear set; 306. Turntable; 307. Sliding rod; 308. Control rod; 309. Brush; 310. Fixed block; 4. Mounting mechanism; 401. Mounting plate; 402. Rotating wheel; 403. Pull rope; 404. Elastic part A; 405. Square block; 406. Partition; 407. Handle; 5. Lifting mechanism; 501. Fixed rod; 502. Slot; 503. Moving rod; 504. Wedge block; 505. Elastic part B; 506. Articulated rod; 507. Pull rod; 508. Bump; 6. Detector housing; 7. Push rod; 8. Groove. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 6 As shown, the present invention provides an underground pipeline precision detector, including a cart 1 and further comprising: Casters 2, which are arranged at the bottom of the cart 1; A cleaning mechanism 3 is provided on the outer wall of the cart 1; The detector housing 6 is mounted on the top outer wall of the cart 1 through the mounting mechanism 4; A push rod 7 is provided on the top outer wall of the cart 1 through the lifting mechanism 5; The cleaning mechanism 3 includes a control rod 308, and a brush 309 is fixedly connected to the outer wall of the control rod 308; The mounting mechanism 4 includes a mounting plate 401, the inner wall of which is elastically connected to a square block 405 via an elastic member A404; The lifting mechanism 5 includes a fixed rod 501 , and a moving rod 503 is slidably connected to the inner wall of the fixed rod 501 .

[0020] The above scheme is adopted: the casters 2 under the cart 1 can move the cart 1 on the ground, and the operator can push the push rod 7 to the location to be detected. The detector housing 6 is the main body of the underground pipeline precision detection instrument, and a signal transmitting device, a receiving device, a data acquisition module, a processing system, a data analysis system, etc. are arranged inside it, which is the existing technology; the detector housing 6 can be installed on the mounting mechanism 4 and can be removed conveniently and quickly for maintenance or data reading. The signal transmitting device is located under the detector housing 6. While the cart 1 is moving, the cleaning mechanism 3 can clear the debris on the ground in the direction of the cart 1 to prevent excessive debris from affecting the transmission of the signal; the lifting mechanism 5 can adjust the height of the push rod 7 to adapt to operators of different heights.

[0021] like Figures 2 to 4 As shown, the top outer wall of the cart 1 is fixedly connected to a fixed block 310, the outer wall of the caster 2 is fixedly connected to a rotating rod 301, the outer wall of the rotating rod 301 is fixedly connected to a synchronous wheel A302, the outer wall of the synchronous wheel A302 is connected to a synchronous wheel B304 through a synchronous belt 303, the outer wall of the synchronous wheel B304 is provided with a turntable 306 through a bevel gear set 305, and the outer wall of the turntable 306 is fixedly connected to a sliding rod 307.

[0022] The above scheme is adopted: when the cart 1 is pushed, the caster 2 will rotate, the rotating rod 301 will rotate synchronously with the caster 2, and drive the synchronous wheel A302 to rotate, and drive the synchronous wheel B304 to rotate through the transmission effect of the synchronous belt 303. The synchronous wheel A302, the synchronous belt 303 and the synchronous wheel B304 are all common existing technologies; when the synchronous wheel B304 rotates, it will drive a group of bevel gears in the bevel gear set 305 to rotate, and when one group of bevel gears rotates, it will drive another group of bevel gears meshing with it to rotate synchronously, and then drive the turntable 306 fixed to it to rotate; the sliding rod 307 is fixedly connected to one side of the turntable 306, and when the turntable 306 rotates, the sliding rod 307 rotates along the circumference; the brush 309 can flip left and right when the cart 1 moves to clean the ground and sweep the ground debris to both sides to avoid affecting the transmission of the signal.

[0023] like Figures 2 to 4 As shown, the synchronous wheel B304 is rotatably connected to the inner wall of the fixed block 310, and the sliding rod 307 contacts the inner wall of the control rod 308; the bevel gear set 305 includes two sets of bevel gears, one set of bevel gears is fixedly connected to the outer wall of the synchronous wheel B304, and the other set of bevel gears is rotatably connected to the inner wall of the fixed block 310, and the bevel gears are fixedly connected to the outer wall of the turntable 306.

[0024] With the above solution, when the turntable 306 rotates, the sliding rod 307 drives the control rod 308 to continuously flip and tilt. Figure 4As shown, when the sliding rod 307 rotates to both sides, the control rod 308 is in an inclined state, and drives the brush 309 to tilt synchronously. Then, in the process of pushing the cart 1, the brush 309 will continuously swing left and right, thereby cleaning the debris on the ground. Therefore, the operator does not need to manually clean the ground and then push the cart 1 for detection, which reduces the work intensity and improves the detection efficiency.

[0025] like Figure 5 As shown, the inner wall of the mounting plate 401 is rotatably connected to a rotating wheel 402, a pull rope 403 is wrapped around the outer wall of the rotating wheel 402, the outer wall of the mounting plate 401 is fixedly connected to a handle 407, the outer wall of the handle 407 is slidably connected to a partition 406, and a groove 8 is provided on the outer wall of the detector housing 6.

[0026] The above scheme is adopted: two groups of rotating wheels 402, pull ropes 403, elastic parts A404 and square blocks 405 are provided, which are symmetrically distributed on the inner walls on both sides of the mounting plate 401. Under normal circumstances, the elastic part A404 keeps the square blocks 405 in a pop-up state due to its own elastic force. When the square blocks 405 are engaged with the grooves 8, the detector housing 6 can be installed and fixed; when the square blocks 405 are out of contact with the grooves 8, the detector housing 6 can be removed.

[0027] like Figure 5 As shown, the mounting plate 401 is fixedly connected to the top outer wall of the cart 1, one end of the pull rope 403 is fixedly connected to the outer wall of the square block 405, and the other end of the pull rope 403 is fixedly connected to the outer wall of the partition 406; one end of the elastic member A404 is fixedly connected to the outer wall of the square block 405, and the other end of the elastic member A404 is fixedly connected to the inner wall of the mounting plate 401, the square block 405 is slidably connected to the inner wall of the mounting plate 401, and the square block 405 is engaged with the groove 8.

[0028] The above scheme is adopted: the operator can hold the handle 407 and pull the partition 406, so that the partition 406 drives one end of the pull rope 403 to move. When the pull rope 403 moves, the rotary wheel 402 rotates, so that the sliding friction between the two is converted into rolling friction, reducing the wear of the pull rope 403, and the rotary wheel 402 will change the pulling direction of the pull rope 403, so that the other end of the pull rope 403 can drive the square block 405 to move to the inner wall of the mounting plate 401. In this state, the operator can place the detector housing 6 in the empty groove of the mounting plate 401, so that the groove 8 corresponds to the position of the square block 405, and then loosen the partition 406. The elastic force of the elastic member A404 causes the square block 405 to pop out and engage with the groove 8 to complete the installation; the square block 405 can also be disengaged from the groove 8 after moving to the inner wall of the mounting plate 401, thereby releasing the fixation of the detector housing 6 and removing it. The operation is relatively convenient and quick, and easy to use.

[0029] like Figure 6As shown, a slot 502 is provided on the inner wall of the fixed rod 501, and two groups of wedge blocks 504 are slidably connected to the inner wall of the movable rod 503. The two groups of wedge blocks 504 are elastically connected by an elastic member B505. The outer wall of the wedge block 504 is hinged to a pull rod 507 through a hinge rod 506, and the outer wall of the pull rod 507 is fixedly connected to a protrusion 508.

[0030] The above scheme is adopted: the movable rod 503 can move up and down in the inner wall of the fixed rod 501, and is fixed by the wedge block 504 and the slot 502, and the height of the push rod 7 is adjusted to adapt to operators of different heights; there are multiple groups of slots 502, and the movable rod 503 can be adjusted to multiple positions for fixation. The arc surface of the wedge block 504 is always facing upward, and the elastic member B505 will keep the wedge block 504 engaged with a group of slots 502 due to its own elastic force. The straight surface of the wedge block 504 contacts the inner wall of the slot 502, which can support the movable rod 503 to keep it in a certain position.

[0031] like Figure 6 As shown, the fixed rod 501 is fixedly connected to the top outer wall of the cart 1, the movable rod 503 is fixedly connected to the outer wall of the push rod 7, the two ends of the elastic member B505 are respectively fixedly connected to the two groups of wedge blocks 504, the two ends of the hinged rod 506 are respectively hinged to the outer walls of the pull rod 507 and the wedge block 504, and the protrusion 508 passes through the outer wall of the movable rod 503.

[0032] When the lever 503 is in the proper position, the wedge block 504 pops out and snaps into the slot 502 under the elastic force of the elastic member B505, thus completing the adjustment.

[0033] This application also proposes a method for precise detection of underground pipelines, comprising the following steps: S1. Install the detector housing 6 on the cart 1, push the cart 1 to the detection area, and use the transmitting device equipped with the detector housing 6 to transmit an electromagnetic signal or current signal of a specific frequency underground, so that the signal propagates along the target pipeline and excites the pipeline to generate a secondary electromagnetic field; S2. Push the detector housing 6 slowly along the preset route. The receiving device receives in real time the secondary electromagnetic field signals generated by the underground pipeline due to induction excitation, as well as other electromagnetic signals in the surrounding environment. The receiving device converts these electromagnetic signals into electrical signals and transmits them to the data acquisition module inside the instrument to collect signal strength and phase data information at different positions and depths. S3. The data processing system built into the detector housing 6 analyzes and processes the large amount of collected data, uses filtering, amplification, comparison and other algorithms to remove environmental interference signals and extract effective signal features related to the target pipeline; S4. Based on the effective signal, combined with the electromagnetic induction principle and geometric positioning algorithm, the plane position, burial depth, direction and other parameters of the underground pipeline are calculated, and the detection results are intuitively presented through the display screen of the detector housing 6 to accurately locate the underground pipeline.

[0034] The working principle and use process of the present invention: The operator can first hold the handle 407 on the mounting plate 401 and pull the partition 406. The partition 406 drives the pull rope 403 to move. The other end of the pull rope 403 drives the square block 405 to move to the inner wall of the mounting plate 401. The detector housing 6 is placed in the empty groove of the mounting plate 401 so that the groove 8 corresponds to the position of the square block 405. The partition 406 is released, and the elastic force of the elastic part A404 causes the square block 405 to pop out and engage with the groove 8, completing the installation of the detector housing 6. Then the height of the push rod 7 can be adjusted according to the height of the operator, so that the operator can push the cart 1 more comfortably. When the height needs to be adjusted upward, the movable rod 503 can be directly pulled upward to raise the push rod 7 to the appropriate position; when it needs to be adjusted downward, the protrusion 508 can be pushed upward to move the two sets of wedge blocks 504 toward the middle through the pull rod 507 and the hinge rod 506, compressing the elastic part B505. After it is out of contact with the slot 502, the movable rod 503 and the push rod 7 are moved downward to the appropriate position. The wedge block 504 pops out under the elastic force of the elastic part B505 and is stuck in the slot 502 to complete the height adjustment. The operator pushes the push rod 7 to move the cart 1 through the caster 2. The rotation of the caster 2 drives the rotating rod 301 and the synchronous wheel A302 to rotate, and the synchronous wheel B304 is rotated through the synchronous belt 303, which in turn drives the bevel gear set 305 and the turntable 306 to rotate. The sliding rod 307 on the turntable 306 rotates along the circumference, driving the control rod 308 to flip back and forth continuously, causing the brush 309 to swing left and right, cleaning the debris on the ground in the forward direction of the cart 1 to prevent it from affecting signal transmission. When the detector housing 6 needs to be removed for maintenance, the handle 407 can be held to pull the partition 406, and the square block 405 can be moved to the inner wall of the mounting plate 401 through the pull rope 403 to break contact with the groove 8, and the detector housing 6 can be removed for maintenance or reading data. It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A precision underground pipeline detector, comprising a cart (1), characterized in that: Also includes: Casters (2), the casters (2) being arranged at the bottom of the cart (1); A cleaning mechanism (3), wherein the cleaning mechanism (3) is arranged on the outer wall of the cart (1); A detector housing (6), the detector housing (6) being arranged on the top outer wall of the cart (1) via a mounting mechanism (4); A push rod (7), the push rod (7) being arranged on the top outer wall of the cart (1) via a lifting mechanism (5); The cleaning mechanism (3) comprises a control rod (308), and a brush (309) is fixedly connected to the outer wall of the control rod (308); The mounting mechanism (4) comprises a mounting plate (401), the inner wall of the mounting plate (401) being elastically connected to a square block (405) via an elastic member A (404); The lifting mechanism (5) comprises a fixed rod (501), and the inner wall of the fixed rod (501) is slidably connected to a moving rod (503).

2. The underground pipeline precision detector according to claim 1, characterized in that: The top outer wall of the cart (1) is fixedly connected to a fixed block (310), the outer wall of the caster (2) is fixedly connected to a rotating rod (301), the outer wall of the rotating rod (301) is fixedly connected to a synchronous wheel A (302), the outer wall of the synchronous wheel A (302) is connected to a synchronous wheel B (304) via a synchronous belt (303), the outer wall of the synchronous wheel B (304) is provided with a rotating disk (306) via a bevel gear set (305), and the outer wall of the rotating disk (306) is fixedly connected to a sliding rod (307).

3. The underground pipeline precision detector according to claim 2, characterized in that: The synchronous wheel B (304) is rotatably connected to the inner wall of the fixed block (310), and the sliding rod (307) is in contact with the inner wall of the control rod (308).

4. The underground pipeline precision detector according to claim 2, characterized in that: The bevel gear set (305) includes two sets of bevel gears, one set of bevel gears is fixedly connected to the outer wall of the synchronous wheel B (304), and the other set of bevel gears is rotatably connected to the inner wall of the fixed block (310), and the bevel gears are fixedly connected to the outer wall of the rotating disk (306).

5. The underground pipeline precision detector according to claim 1, characterized in that: The inner wall of the mounting plate (401) is rotatably connected to a rotating wheel (402), the outer wall of the rotating wheel (402) is wound with a pull rope (403), the outer wall of the mounting plate (401) is fixedly connected to a handle (407), the outer wall of the handle (407) is slidably connected to a partition (406), and the outer wall of the detector housing (6) is provided with a groove (8).

6. The underground pipeline precision detector according to claim 5, characterized in that: The mounting plate (401) is fixedly connected to the top outer wall of the cart (1), one end of the pull rope (403) is fixedly connected to the outer wall of the square block (405), and the other end of the pull rope (403) is fixedly connected to the outer wall of the partition (406).

7. The underground pipeline precision detector according to claim 5, characterized in that: One end of the elastic member A (404) is fixedly connected to the outer wall of the square block (405), and the other end of the elastic member A (404) is fixedly connected to the inner wall of the mounting plate (401). The square block (405) is slidably connected to the inner wall of the mounting plate (401), and the square block (405) is engaged with the groove (8).

8. The underground pipeline precision detector according to claim 1, characterized in that: The inner wall of the fixed rod (501) is provided with a slot (502), the inner wall of the movable rod (503) is slidably connected to two groups of wedge blocks (504), the two groups of wedge blocks (504) are elastically connected via an elastic member B (505), the outer wall of the wedge block (504) is hinged to a pull rod (507) via a hinge rod (506), and the outer wall of the pull rod (507) is fixedly connected to a protrusion (508).

9. The underground pipeline precision detector according to claim 8, characterized in that: The fixed rod (501) is fixedly connected to the outer wall of the top end of the cart (1), the movable rod (503) is fixedly connected to the outer wall of the push rod (7), the two ends of the elastic member B (505) are respectively fixedly connected to the two groups of wedge blocks (504), the two ends of the hinged rod (506) are respectively hinged to the outer walls of the pull rod (507) and the wedge block (504), and the protrusion (508) passes through the outer wall of the movable rod (503).

10. A method for precise detection of underground pipelines, applied to the precise underground pipeline detector according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Install the detector housing (6) on the cart (1), push the cart (1) to the detection area, and use the transmitting device equipped with the detector housing (6) to transmit an electromagnetic signal or current signal of a specific frequency underground, so that the signal propagates along the target pipeline and excites the pipeline to generate a secondary electromagnetic field; S2. Push the detector housing (6) slowly along the preset route, and the receiving device receives the secondary electromagnetic field signals generated by the underground pipeline due to induction excitation, as well as other electromagnetic signals in the surrounding environment in real time. The receiving device converts these electromagnetic signals into electrical signals and transmits them to the data acquisition module inside the instrument to collect signal strength and phase data information at different positions and depths; S3. The data processing system built into the detector housing (6) analyzes and processes the large amount of data collected, uses filtering, amplification, comparison and other algorithms to remove environmental interference signals and extract effective signal features related to the target pipeline; S4. Based on the effective signal, combined with the electromagnetic induction principle and geometric positioning algorithm, the plane position, burial depth, direction and other parameters of the underground pipeline are calculated, and the detection results are visually presented through the display screen of the detector housing (6) to accurately locate the underground pipeline.

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