Underground metal pipeline detection device for geotechnical engineering investigation

Abstract

This invention relates to the field of geotechnical engineering investigation equipment technology, and discloses an underground metal pipeline detection device for geotechnical engineering investigation. The invention utilizes a power-storing cleaning mechanism on the outside of the rotating shaft. During each routine folding / unfolding operation of the detection and operating ends, it dynamically absorbs and stores rotational stress. When the stored stress is released, the cleaning component adheres tightly to the outer wall of the rotating shaft, generating a directional scraping action. This forcibly removes loose dust and silt that have not yet hardened or have just infiltrated the rotating shaft surface, rather than waiting for them to accumulate and compact before manual processing. This proactive cleaning reduces the probability of mechanical jamming of the rotating shaft. In other words, by actively scraping away accumulated dust, blocking particle intrusion paths, and utilizing residual energy for self-cleaning, the rotating shaft and conductive ring assembly are kept in a relatively clean working microenvironment for a long time. This reduces the tedious maintenance burden of frequent manual wiping and disassembly cleaning by operators, extending the service life of the rotating shaft.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering investigation equipment technology, specifically to an underground metal pipeline detection device for geotechnical engineering investigation. Background Technology

[0002] Geotechnical engineering investigation is a crucial step in the early stages of engineering construction to ascertain the site's engineering geological conditions. Accurate detection of existing underground metal pipelines is an essential procedure for preventing construction accidents and ensuring the safe operation of urban lifelines. Currently, handheld electromagnetic induction pipeline detectors have become the most widely used detection tool in field investigations due to their portability and real-time capabilities.

[0003] Traditional handheld pipeline detectors typically consist of a probe and an operating end (handle) connected by a hinged shaft. To adapt to different terrains and storage needs, the probe can be folded and rotated relative to the handle around the shaft. A conductive ring assembly for power supply and signal transmission is housed inside the shaft, while basic protection is provided by a simple engineering plastic shell and end face gaskets. In use, the operator holds the handle and places the probe close to the ground for scanning. After use, the probe is folded back to reduce the overall size of the device, making it easy to place in a carrying case for transport.

[0004] However, actual field conditions are far harsher than laboratory environments. Geotechnical investigation sites are characterized by high levels of dust and sediment, and fine dust easily penetrates the gaps in the shaft and gradually hardens. This not only directly causes mechanical jamming and increased rotational resistance during folding, but also carries hard particles into the internal conductive ring area through rotational friction, wearing down the conductive surface, increasing contact resistance, and ultimately inducing signal attenuation or power outages. Therefore, operators must frequently manually wipe the shaft or even disassemble it for cleaning, severely reducing field work efficiency. Summary of the Invention

[0005] This invention provides an underground metal pipeline detection device for geotechnical engineering investigation, which solves the problems of existing detection devices being easily jammed by mud and sand intrusion of the rotating shaft during outdoor investigation operations, and poor signal contact caused by dirt accumulation on the contact surface of the conductive ring.

[0006] The present invention provides an underground metal pipeline detection device for geotechnical engineering investigation, comprising a detection end, an operating end, and a power-storing cleaning mechanism. The operating end is rotatably connected to the detection end via a rotating shaft; the power-storing cleaning mechanism is disposed outside the rotating shaft and located between the detection end and the operating end. The power-storing cleaning mechanism absorbs and stores stress when the detection end and the operating end rotate relative to each other, and at least partially utilizes the stored stress to perform a cleaning action on the rotating shaft.

[0007] Beneficial effects: By incorporating a power-storing cleaning mechanism on the outside of the shaft, rotational stress is dynamically absorbed and stored during each routine folding / unfolding operation of the detection and operating ends. When the stored stress is released, the cleaning component adheres tightly to the outer wall of the shaft, generating a directional scraping motion. This forcibly removes loose dust and silt that have not yet hardened or have just intruded from the shaft surface, rather than waiting for them to accumulate and compact before manual removal. This proactive cleaning reduces the probability of mechanical jamming of the shaft. In other words, by actively scraping away accumulated dust, blocking particle intrusion paths, and utilizing residual energy during operation for self-cleaning, the shaft and conductive ring assembly remain in a relatively clean working microenvironment for a long time. This reduces the tedious maintenance burden of frequent manual wiping and disassembly cleaning by operators, extending the service life of the shaft.

[0008] In one optional embodiment, the power-storing cleaning mechanism includes a ratchet disc, a cleaning strip, and a torsion spring. The ratchet disc is fitted onto the outside of the rotating shaft; the cleaning strip is fixedly connected to one side of the ratchet disc and is distributed circumferentially along the rotating shaft; the torsion spring is disposed on one side of the ratchet disc, one end of the torsion spring is movably connected to the operating end, and the other end of the torsion spring is connected to the ratchet disc; the torsion spring deforms when the detection end and the operating end rotate relative to each other to absorb and store stress.

[0009] Beneficial effects: By connecting one end of the torsion spring to the operating end and the other end to the ratchet disk, and with the ratchet disk fitted outside the rotating shaft, the deformation and energy storage process of the torsion spring is coupled with the unidirectional rotation constraint of the ratchet disk when the probe end reciprocates. The ratchet disk allows the probe end to continuously compress the torsion spring to store energy when rotating in one direction, while using the ratchet characteristics to prevent it from prematurely rebounding and releasing in the other direction, driving the cleaning strip to perform a high-speed, high-torque scraping action on the rotating shaft, effectively removing stubborn dirt that has hardened or has strong adhesion.

[0010] In one optional embodiment, a plurality of cleaning strips are provided, and the plurality of cleaning strips are distributed at intervals along the circumference of the ratchet disc.

[0011] Beneficial effects: Multiple cleaning strips are spaced apart circumferentially along the ratchet disc. When the ratchet disc is driven to rotate by the torsion spring, the same circumferential area on the outer wall of the shaft will be repeatedly swept across by multiple cleaning strips at different angles. Compared with the method of a single cleaning strip completing the cleaning in one pass, this significantly improves the area coverage and cleanliness within a unit cleaning action. At the same time, gaps are formed between adjacent cleaning strips, which act as instant chip removal channels during the rotation and scraping process. Mud and sand particles scraped off from the shaft surface by the cleaning strips can be centrifugally thrown out along these gaps or fall naturally, ensuring that the scraped contaminants can smoothly leave the cleaning area and avoid secondary accumulation and blockage of scraped materials.

[0012] In one optional embodiment, the ratchet disc has a first ratchet tooth on the side facing the probe end, and the probe end has a second ratchet tooth on the side facing the ratchet disc, wherein the first ratchet tooth and the second ratchet tooth mesh with each other.

[0013] Beneficial effects: By placing the first ratchet on the side of the ratchet disc facing the probe end and the second ratchet on the side of the probe end facing the ratchet disc, the two form an end-face meshing engagement. This allows the probe end to push the first ratchet through the second ratchet in a certain rotational direction, causing the ratchet disc to rotate synchronously and compress the torsion spring to store energy. When the probe end rotates to the fully closed and retracted limit position, the first and second ratchet disengage, the torsion spring releases the stored elastic stress, and the ratchet disc rotates around the shaft. Several cleaning strips fixed on the outside of the ratchet disc simultaneously scrape along the outer wall of the shaft, cleaning dust and sand adhering to the gaps in the shaft and alleviating the problem of shaft rotation jamming. At the same time, when the first and second ratchets are meshing, their end faces always remain in close contact, providing auxiliary sealing against external dust and sand and preventing them from entering the conductive ring, reducing the probability of the conductive ring being contaminated.

[0014] In one optional embodiment, the underground metal pipeline detection device for geotechnical engineering investigation further includes a power-off mechanism, which is disposed outside the rotating shaft and inside the detection end, and is used to control the on / off of the electrical connection between the detection end and the operating end.

[0015] Beneficial effects: By placing the power-off mechanism outside the rotating shaft and inside the detection end, and controlling the on / off of the electrical connection between the detection end and the operating end, the power-off mechanism automatically cuts off the power supply circuit when the detection end flips relative to the operating end to the retracted closed position; when the detection end flips out to the working position, the power-off mechanism automatically restores conductivity, forming a follow-up power-off mechanism. This achieves fully automated control with power off upon retraction and power on upon unfolding, eliminating standby power consumption in the retracted state. Simultaneously, by placing the entire power-off mechanism inside the detection end housing, the housing forms a physical dust barrier, reducing the probability of dirt accumulation on the power-off mechanism.

[0016] In one optional embodiment, the power-off mechanism includes a moving energized ring and a fixed energized ring. The moving energized ring is electrically connected to the detection end; the fixed energized ring is mounted outside the rotating shaft and electrically connected to the operating end; the moving energized ring and the fixed energized ring are coaxially arranged, with the moving energized ring located outside the fixed energized ring.

[0017] Beneficial effects: By coaxially sleeved the moving contact ring around the fixed contact ring, forming a radially stacked annular sliding pair, the outer moving contact ring rotates synchronously with the probe when the probe rotates around the axis, while the inner fixed contact ring remains stationary. During use, the outer moving contact ring physically shields the conductive contact surface of the inner fixed contact ring, reducing the direct intrusion of external dust into the conductive area. Together with the energy-saving cleaning mechanism, it forms a dual protection of active cleaning on the outer layer and shielding by the outer ring, further reducing the risk of poor contact caused by contamination of the conductive contact surface.

[0018] In one optional embodiment, the interior of the moving contact ring is filled with a moving ring insulating block, and the exterior of the stationary contact ring is filled with a stationary ring insulating block; when the probe end and the operating end rotate relative to each other to the unfolded state, the moving contact ring and the stationary contact ring to conduct electricity; when the probe end and the operating end rotate relative to each other to the folded state, the moving ring insulating block and the stationary contact ring to disconnect the electrical connection.

[0019] Beneficial effects: When the probe unfolds around the axis, the outer moving ring rotates synchronously with the probe. Its inner wall slides in circumferential contact with the outer wall of the fixed inner ring. Since the moving ring has an embedded moving ring insulating block and the fixed ring has an embedded fixed ring insulating block, both form a composite ring structure with alternating conductive and insulating arc segments along the circumference. When the probe rotates to the unfolding working angle, the conductive arc segment of the moving ring is exactly opposite and in contact with the conductive arc segment of the fixed ring, achieving electrical conduction. When the probe rotates to the folding and storage angle, the moving ring insulating block rotates to contact the conductive arc segment of the fixed ring, and the insulating medium blocks the electrical path between the two, achieving power-off isolation. Thus, between the two extreme positions of the probe end unfolding and folding, the coaxial sleeve structure, together with the insulation filling, enables automatic switching between conduction and disconnection without the need for any additional electronic switching components. Furthermore, the inner and outer rings always maintain radial contact and coaxial sliding throughout the entire rotation stroke, ensuring the smoothness of the switching action and the reliability of the contact.

[0020] In one optional embodiment, the underground metal pipeline detection device for geotechnical engineering investigation further includes a limiting mechanism disposed between the detection end and the operating end, which is used to limit the rotation of the detection end when the detection end rotates relative to the operating end to a predetermined angle.

[0021] Beneficial effects: By placing a limiting mechanism between the detection end and the operating end, and preventing the detection end from rotating back when it reaches a predetermined angle, this limiting mechanism overcomes common external interferences in the field, such as soft ground and vehicle vibrations, when the detection end is extended to the working angle. This ensures that the detection end maintains its set posture throughout the scanning process, avoiding changes in electromagnetic induction signal coupling efficiency due to angle drift, thus guaranteeing the repeatability and accuracy of pipeline detection data. Simultaneously, this limiting mechanism also functions when the detection end is folded to the storage angle, preventing accidental unfolding of the equipment during field transport and ensuring the fixed shape of the detection device within the storage compartment, avoiding squeezing and collisions with other components inside the container.

[0022] In one optional embodiment, the limiting mechanism includes a limiting groove, a limiting post, and an elastic element. The limiting groove is formed outside the detection end and distributed around the rotating shaft; the limiting post is disposed inside the operating end, with its end corresponding to the limiting groove; the elastic element is disposed between the limiting post and the operating end, for applying a spring force to the limiting post in the direction of the limiting groove.

[0023] Beneficial Effects: By employing a combination of a limiting groove, a limiting post, and an elastic element to form an elastically embedded, rigidly anti-rotation mechanical locking structure, a simple, reliable, and reusable angular position retention solution is constructed in the hinge area between the probe end and the operating end. During use, the limiting post maintains its tendency to embed into the limiting groove under the continuous force of the elastic element. When the probe end rotates to the position where the limiting groove aligns with the limiting post, the end of the limiting post automatically embeds into the limiting groove under the elastic force, forming a radial embedding fit and providing a clear mechanical anti-rotation constraint. Compared to damping positioning methods that rely on friction surface pressing, the sidewall of the limiting post abuts against the sidewall of the limiting groove, which can withstand external disturbance torques far exceeding frictional forces, thus maintaining the stability of the probe end's attitude even on soft ground or in environments with strong vibrations. Meanwhile, the limiting post is located inside the operating end, with only its end extending out to contact the limiting groove. The main body of the limiting post and the elastic element are completely housed within the operating end housing, effectively isolating it from external dust and mud, reducing the risk of the limiting mechanism jamming and failing due to dust intrusion, and ensuring the operational reliability of long-term field service.

[0024] In one optional embodiment, two sets of limiting grooves are provided, and the two sets of limiting grooves are respectively located at the installation positions corresponding to the limiting post when the probe end is in the unfolded state and the folded state; a guide groove is also provided on the outside of the probe end, and the guide groove is disposed between the two sets of limiting grooves and distributed around the rotating shaft. The guide groove is used to guide the limiting post to slide between the two sets of limiting grooves when the probe end rotates relative to the operating end.

[0025] Beneficial Effects: By setting two sets of limiting slots only on the outside of the probe end, corresponding to the unfolded working state and the folded storage state respectively, the limiting function is precisely anchored to the two core corner positions with the highest frequency of use during equipment operation. Unfolding locks the working state, and folding locks the storage state, meeting daily use needs without the need for multiple adjustment levels. Furthermore, by creating guide slots distributed around the rotating shaft between the two sets of limiting slots, the sliding of the limiting post between the two sets of slots is limited to a continuous guide path, making each folding and unfolding operation more linear, smooth, and controllable, improving operational comfort and angle switching efficiency. Simultaneously, the guide slots extend from the unfolded position limiting slot to the folded position limiting slot, and their stroke length is designed to match the effective storage stroke of the torsion spring in the energy-saving cleaning mechanism. That is, the entire distance the limiting post slides along the guide slot from the unfolded position to the folded position corresponds to the complete rotation angle of the probe end from fully unfolded to fully folded. At this time, the torsion spring is also simultaneously compressed to its maximum storage state, storing sufficient energy for the self-cleaning action of the rotating shaft. In addition, when the limiting post slides along the guide groove and finally falls into another set of limiting grooves, the elastic element pushes the limiting post to generate an impact when entering the groove. This provides clear tactile and auditory feedback to the operator through the operating end housing, so that the status information of whether the equipment is fully unfolded or fully folded can be accurately perceived through force. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the underground metal pipeline detection device for geotechnical engineering investigation provided in this embodiment of the invention; Figure 2 A schematic diagram of the underground metal pipeline detection device for geotechnical engineering investigation provided in an embodiment of the present invention, in which the detection end and the operation end are in a retracted state; Figure 3 A schematic diagram of the underground metal pipeline detection device for geotechnical engineering investigation provided in an embodiment of the present invention, showing the detection end and the operating end in an unfolded state; Figure 4 A partial structural schematic diagram of an underground metal pipeline detection device for geotechnical engineering investigation provided in an embodiment of the present invention; Figure 5 for Figure 4 A magnified schematic diagram of part A in the middle section; Figure 6 A partial structural schematic diagram of an underground metal pipeline detection device for geotechnical engineering investigation provided in an embodiment of the present invention; Figure 7 for Figure 6 A partially enlarged structural diagram of section B; Figure 8 A schematic diagram of the detection end in the underground metal pipeline detection device for geotechnical engineering investigation provided in an embodiment of the present invention; Figure 9 for Figure 8 A magnified view of part C in the middle; Figure 10 A schematic diagram of a partial cross-sectional structure of the detection end in the underground metal pipeline detection device for geotechnical engineering investigation provided in an embodiment of the present invention; Figure 11 for Figure 10 A magnified view of part D in the middle; Figure 12 A schematic diagram of the energy storage and cleaning mechanism in the underground metal pipeline detection device for geotechnical engineering investigation provided in an embodiment of the present invention; Figure 13 A schematic diagram of the underground metal pipeline detection device for geotechnical engineering investigation provided in this embodiment of the invention; Figure 14 A schematic diagram of the underground metal pipeline detection device for geotechnical engineering investigation provided in this embodiment of the invention.

[0028] Explanation of reference numerals in the attached figures: 1. Detector end; 11. Second ratchet; 12. Limiting groove; 13. Guide groove; 14. Relief groove; 15. Locking sidewall; 2. Operating terminal; 21. Power port; 3. Power-saving cleaning mechanism; 31. Ratchet disc; 32. Stain removal strip; 33. Torsion spring; 34. First ratchet tooth; 35. Chip removal groove; 4. Power-off mechanism; 41. Dynamic energizing ring; 42. Fixed energizing ring; 5. Limiting mechanism; 51. Limiting post; 52. Elastic element; 6. Enclosure; 61. Connection port; 7. Detection terminal. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] According to embodiments of the present invention, the provided underground metal pipeline detection device for geotechnical engineering investigation, such as... Figures 1 to 14 As shown, it includes a detection end 1, an operating end 2, and a power-accumulating cleaning mechanism 3. The operating end 2 is rotatably connected to the detection end 1 via a rotating shaft; the power-accumulating cleaning mechanism 3 is disposed outside the rotating shaft and located between the detection end 1 and the operating end 2. The power-accumulating cleaning mechanism 3 absorbs and stores stress when the detection end 1 and the operating end 2 rotate relative to each other, and at least partially utilizes the stored stress to perform a cleaning action on the rotating shaft.

[0031] By installing a power-accumulating cleaning mechanism 3 on the outside of the shaft, rotational stress is dynamically absorbed and stored during each daily folding / unfolding operation of the detection end 1 and the operating end 2. When the stored stress is released, the cleaning component adheres tightly to the outer wall of the shaft and generates a directional scraping action. This forcibly removes loose dust and silt that have not yet hardened or have just intruded from the shaft surface, rather than waiting for them to accumulate and compact before manual treatment. This proactive cleaning reduces the probability of mechanical jamming of the shaft. In other words, by actively scraping away accumulated dust, blocking the path of particle intrusion, and utilizing residual energy during operation to achieve self-cleaning, the shaft and conductive ring assembly are kept in a relatively clean working microenvironment for a long time. This reduces the tedious maintenance burden of frequent manual wiping, disassembly, and cleaning by operators, and extends the service life of the shaft.

[0032] In addition, the detection device also includes a power-off mechanism 4 and a limiting mechanism 5. The power-off mechanism 4 is located outside the rotating shaft and inside the detection end 1, and is used to control the on / off of the electrical connection between the detection end 1 and the operating end 2. The limiting mechanism 5 is located between the detection end 1 and the operating end 2, and is used to limit the rotation of the detection end 1 when the detection end 1 rotates relative to the operating end 2 to a predetermined angle.

[0033] By setting the power-off mechanism 4 outside the rotating shaft and inside the detection end 1, and controlling the on / off of the electrical connection between the detection end 1 and the operating end 2, when the detection end 1 is flipped relative to the operating end 2 to the retracted closed position, the power-off mechanism 4 automatically cuts off the power supply circuit; when the detection end 1 is flipped and unfolded to the working position, the power-off mechanism 4 automatically restores the conduction, forming a follow-up power-off mechanism, realizing fully automated control of immediate disconnection upon retraction and immediate connection upon unfolding, eliminating standby power consumption in the retracted state.

[0034] Meanwhile, by placing the entire power-off mechanism 4 inside the housing of the detection end 1, the housing forms a physical dust barrier, reducing the probability of dirt accumulation on the power-off mechanism 4.

[0035] By placing a limiting mechanism 5 between the detection end 1 and the operating end 2, and limiting it to prevent the detection end 1 from rotating in the opposite direction when it rotates to a predetermined angle, the limiting mechanism 5 can overcome common external interferences in the field, such as soft ground and vibrations from passing vehicles, when the detection end 1 is extended to the working angle. This ensures that the detection end 1 maintains the set posture throughout the entire scanning process, avoiding changes in electromagnetic induction signal coupling efficiency due to angle drift, thereby guaranteeing the repeatability and accuracy of pipeline detection data.

[0036] Meanwhile, the limiting mechanism 5 can also function when the detection end 1 is folded to the storage angle to prevent the equipment from being accidentally unfolded during field transportation and ensure that the outer contour of the detection device in the storage compartment is fixed, avoiding squeezing and collision with other components in the box 6.

[0037] The components of this embodiment will now be described in detail.

[0038] It can be noted that the energy storage and cleaning mechanism 3 is not specifically limited, and can be implemented in various ways based on energy storage elements such as torsion springs, spiral springs or pneumatic springs.

[0039] Preferably, a torsion spring 33 is used in conjunction with a ratchet disc 31.

[0040] Specifically, such as Figure 4 , Figure 5 and Figure 12 As shown, the power-accumulating cleaning mechanism 3 includes a ratchet disc 31, a cleaning strip 32, and a torsion spring 33. The ratchet disc 31 is fitted onto the outside of the rotating shaft; the cleaning strip 32 is fixedly connected to one side of the ratchet disc 31 and is distributed circumferentially along the rotating shaft; the torsion spring 33 is disposed on one side of the ratchet disc 31, one end of the torsion spring 33 is movably connected to the operating end 2, and the other end of the torsion spring 33 is connected to the ratchet disc 31; the torsion spring 33 deforms when the detection end 1 and the operating end 2 rotate relative to each other to absorb and store stress.

[0041] By connecting one end of the torsion spring 33 to the operating end 2 and the other end to the ratchet disk 31, and with the ratchet disk 31 mounted on the outside of the rotating shaft, the deformation and energy storage process of the torsion spring 33 is coupled with the unidirectional rotation constraint of the ratchet disk 31 when the probe end 1 reciprocates. The ratchet disk 31 allows the probe end 1 to continuously compress the torsion spring 33 to store energy when rotating in one direction, while using the ratchet characteristics to prevent it from prematurely rebounding and releasing in the other direction, driving the cleaning strip 32 to perform a high-speed, high-torque scraping action on the rotating shaft, effectively removing stubborn dirt that has hardened or has strong adhesion.

[0042] Furthermore, multiple cleaning strips 32 are provided, and the multiple cleaning strips 32 are distributed at intervals along the circumference of the ratchet disk 31.

[0043] Multiple cleaning strips 32 are distributed circumferentially along the ratchet disk 31. When the ratchet disk 31 is driven to rotate by the torsion spring 33, the same circumferential area on the outer wall of the rotating shaft will be repeatedly swept by multiple cleaning strips 32 at different angles. Compared with the method of a single cleaning strip 32 scraping once to complete the cleaning, the area coverage and cleanliness within a unit cleaning action are significantly improved.

[0044] The power-saving cleaning mechanism 3 also includes a chip removal groove 35 located at the bottom of the hinge area. The chip removal groove 35 is connected to the shaft mounting area and is inclined away from the shaft. When the cleaning strip 32 scrapes the shaft surface during folding, the stripped mud and sand enter the chip removal groove 35 and are guided to the outside of the housing under the action of gravity, thereby preventing mud and sand from accumulating at the root of the shaft and inside the housing.

[0045] Meanwhile, gaps are formed between adjacent cleaning strips 32, which act as immediate chip removal channels during the rotating scraping process. The mud and sand scraped off from the rotating shaft surface by the cleaning strips 32 can be centrifugally thrown out along the gaps or fall naturally, ensuring that the scraped contaminants can smoothly leave the cleaning area and avoid secondary accumulation and blockage of the scraped material.

[0046] Furthermore, such as Figure 4 , Figure 5 , Figure 8 , Figure 9 and Figure 12 As shown, a first ratchet 34 is provided on the side of the ratchet disk 31 facing the probe end 1, and a second ratchet 11 is provided on the side of the probe end 1 facing the ratchet disk 31. The first ratchet 34 and the second ratchet 11 mesh with each other.

[0047] By setting the first ratchet 34 on the side of the ratchet disc 31 facing the probe end 1 and setting the second ratchet 11 on the side of the probe end 1 facing the ratchet disc 31, the two form an end face meshing engagement, so that the probe end 1 can push the first ratchet 34 through the second ratchet 11 in a certain rotation direction, causing the ratchet disc 31 to rotate synchronously and thus compress the torsion spring 33 to store force. When the probe end 1 rotates to the fully closed and retracted limit position, the first ratchet 34 and the second ratchet 11 disengage, the torsion spring 33 releases the stored elastic stress, and causes the ratchet disc 31 to rotate around the rotating shaft. Several cleaning strips 32 fixed on the outside of the ratchet disc 31 simultaneously scrape along the outer wall of the rotating shaft to clean the dust and mud adhering to the gaps of the rotating shaft, and alleviate the problem of the rotating shaft getting stuck.

[0048] Meanwhile, when the first ratchet 34 and the second ratchet 11 mesh with each other, their end faces always remain in close contact, which helps to seal external dust and mud and prevents them from entering the conductive ring, reducing the probability of the conductive ring being contaminated.

[0049] In one embodiment, such as Figure 10 and Figure 11As shown, the probe end 1 is also provided with a clearance groove 14, which is a concave structure on the end face of the probe end 1 facing the ratchet disk 31.

[0050] It can be noted that the relief groove 14 is not specifically limited, and can be in various forms such as a continuous annular groove, a segmented interval groove, or a local fan-shaped groove.

[0051] Preferably, a continuous annular groove pattern distributed around the rotating shaft is used.

[0052] Specifically, such as Figures 8 to 12 As shown, a second ratchet 11 is provided at the bottom of the clearance groove 14, and its depth is greater than the tooth height of the first ratchet 34 on the ratchet disc 31. Several second ratchets 11 are evenly distributed along the circumferential direction at the bottom of the groove.

[0053] Furthermore, the processing method of the relief groove 14 is not specifically limited; it can be formed by casting as a single piece, machined by milling, or sintered by powder metallurgy.

[0054] Preferably, a combination of CNC milling and gear shaping processes is used for machining.

[0055] Specifically, the annular groove of the clearance groove 14 is cut and shaped on the end face of the probe end 1 by a milling cutter, and the second ratchet 11 at the bottom of the groove is machined one by one along the circumferential direction by a gear shaping cutter.

[0056] It should be noted that the power-off mechanism 4 is not specifically limited and can take various forms such as mechanical contact switch, reed switch or sliding conductive ring.

[0057] Preferably, a combination of a coaxially sleeved conductive ring and an insulating block is used.

[0058] Specifically, such as Figure 4 , Figure 5 , Figure 10 and Figure 11 As shown, the power-off mechanism 4 includes a moving energized ring 41 and a fixed energized ring 42. The moving energized ring 41 is electrically connected to the detection end 1; the fixed energized ring 42 is installed outside the rotating shaft and electrically connected to the operating end 2; the moving energized ring 41 and the fixed energized ring 42 are coaxially arranged, with the moving energized ring 41 located outside the fixed energized ring 42.

[0059] By coaxially sleeved on the outside of the fixed energizing ring 42 and arranged coaxially, a radially stacked annular sliding pair is formed. When the probe end 1 is rotated and unfolded around the axis, the outer dynamic energizing ring 41 rotates synchronously with the probe end 1, while the inner fixed energizing ring 42 remains fixed.

[0060] During use, the outer dynamic contact ring 41 physically shields the conductive contact surface of the inner fixed contact ring 42, reducing the direct intrusion of external dust into the conductive area. Together with the power-accumulating cleaning mechanism 3, it forms a dual protection of active cleaning of the outer layer and shielding of the outer ring, further reducing the risk of poor contact caused by contamination of the conductive contact surface.

[0061] Furthermore, the interior of the moving contact ring 41 is filled with a moving ring insulating block, and the exterior of the fixed contact ring 42 is filled with a fixed ring insulating block; when the probe end 1 and the operating end 2 rotate relative to each other to the unfolded state, the moving contact ring 41 and the fixed contact ring 42 make contact and conduct; when the probe end 1 and the operating end 2 rotate relative to each other to the folded state, the moving ring insulating block makes contact with the fixed contact ring 42 to disconnect the electrical connection.

[0062] When the probe end 1 rotates and unfolds around the axis, the outer moving ring 41 rotates synchronously with the probe end 1. Its inner wall and the outer wall of the fixed ring 42 remain in circumferential contact and slide together. Since the moving ring 41 has a moving ring insulating block embedded inside and the fixed ring 42 has a fixed ring insulating block embedded outside, both of them form a composite ring structure in which conductive arc segments and insulating arc segments are arranged alternately in the circumferential direction. When the probe end 1 rotates to the unfolding working angle, the conductive arc segment of the moving ring 41 is exactly opposite to and in contact with the conductive arc segment of the fixed ring 42, realizing electrical conduction. When the probe end 1 rotates to the folding and storage angle, the moving ring insulating block rotates to contact the conductive arc segment of the fixed ring 42, and the insulating medium blocks the electrical path between the two, realizing power-off isolation.

[0063] Thus, between the two extreme positions of the probe end 1 unfolding and folding, the coaxial sleeve structure, together with the insulation filling, realizes the automatic follow-up switching of conduction on and off without the intervention of any additional electronic switching components. Moreover, the inner and outer rings always maintain radial contact and coaxial sliding throughout the entire rotation stroke, ensuring the smoothness of the switching action and the reliability of the contact.

[0064] In use, the outer dynamic conductive ring 41 physically shields the conductive contact surface of the inner stationary conductive ring 42, reducing the direct intrusion of external dust into the conductive area. Together with the energy-saving cleaning mechanism 3, it forms a dual protection of active cleaning on the outer layer and shielding by the outer ring, further reducing the risk of poor contact caused by contamination of the conductive contact surface. The dynamic ring insulating block and the stationary ring insulating block fill the gaps between the conductive rings, which can also prevent mud and sand from adhering to the conductive contact surface, weakening the possibility of poor conductivity and leakage.

[0065] It should be noted that the limiting mechanism 5 is not specifically limited and can be a variety of positioning structures such as spring pin type, ball type or elastic claw type.

[0066] Preferably, a spring-driven limiting post 51 is used in conjunction with a limiting groove 12.

[0067] Specifically, such as Figures 5 to 9As shown, the limiting mechanism 5 includes a limiting groove 12, a limiting post 51, and an elastic element 52. The limiting groove 12 is opened on the outside of the detection end 1 and is distributed around the rotating shaft; the limiting post 51 is disposed inside the operating end 2, and the end of the limiting post 51 corresponds to the limiting groove 12; the elastic element 52 is disposed between the limiting post 51 and the operating end 2, and is used to apply a spring force to the limiting post 51 in the direction of the limiting groove 12.

[0068] By employing the combination of limiting groove 12, limiting post 51 and elastic element 52 to form an elastically embedded, rigid anti-rotation mechanical locking structure, a simple, reliable and reusable angular position retention scheme is constructed in the hinge area between the detection end 1 and the operation end 2.

[0069] In use, the limiting post 51 always tends to be embedded in the limiting groove 12 under the continuous force of the elastic member 52. When the probe end 1 rotates to the position where the limiting groove 12 is aligned with the limiting post 51, the end of the limiting post 51 is automatically embedded in the limiting groove 12 under the elastic drive, forming a radial embedding fit, providing a clear mechanical anti-rotation constraint.

[0070] Compared to the damping positioning method that relies on friction surface pressing, the side wall of the limiting post 51 abuts against the side wall of the limiting groove 12. The limiting groove 12 is provided with a locking side wall 15. When the detection end 1 is subjected to external impact and has a tendency to rotate, a wedge-shaped abutment relationship is formed between the limiting post 51 and the locking side wall 15, so that the rotational torque generated by the impact is converted into the pressing force of the limiting post 51 on the locking side wall 15. This prevents the limiting post 51 from exiting the limiting groove 12 due to axial force, improves the impact resistance stability of the detection end 1 in the unfolded state, and thus maintains the stability of the attitude of the detection end 1 even on soft ground or in a strong vibration environment.

[0071] Meanwhile, the limiting post 51 is located inside the operating end 2, with only its end extending out to contact the limiting groove 12. The main body of the limiting post 51 and the elastic element 52 are completely housed within the housing of the operating end 2, effectively isolating it from the external dust and mud environment. This reduces the risk of the limiting mechanism 5 becoming stuck and failing due to dust intrusion, ensuring the operational reliability of long-term field service.

[0072] Furthermore, such as Figure 9 As shown, there are two sets of limiting grooves 12. The two sets of limiting grooves 12 are located at the installation positions corresponding to the limiting post 51 when the probe end 1 is in the unfolded state and the folded state, respectively. A guide groove 13 is also provided on the outside of the probe end 1. The guide groove 13 is located between the two sets of limiting grooves 12 and distributed around the rotating shaft. The guide groove 13 is used to guide the limiting post 51 to slide between the two sets of limiting grooves 12 when the probe end 1 rotates relative to the operating end 2.

[0073] By setting two sets of limiting slots 12 on the outside of the detection end 1, corresponding to the unfolded working state and the folded storage state respectively, the limiting function is precisely anchored to the two core corner positions with the highest frequency of use in the device. Unfolding locks the working state, and folding locks the storage state. Daily use needs can be met without multiple adjustment levels.

[0074] Based on this, by opening guide grooves 13 distributed around the pivot between the two sets of limiting grooves 12, the sliding of the limiting post 51 between the two sets of grooves is limited to a continuous guide path, making the feel of each folding and unfolding operation more linear, smooth and controllable, improving the comfort of operation and the efficiency of angle switching.

[0075] Meanwhile, the guide groove 13 extends from the unfolded position limiting groove 12 to the folded position limiting groove 12. Its stroke length is designed to match the effective power storage stroke of the torsion spring 33 in the power storage cleaning mechanism 3. That is, the entire journey of the limiting post 51 sliding along the guide groove 13 from the unfolded position to the folded position corresponds to the complete rotation angle of the probe end 1 from fully unfolded to fully folded. At this time, the torsion spring 33 is also compressed to the maximum power storage state, which stores sufficient energy for the self-cleaning action of the rotating shaft.

[0076] In addition, when the limiting post 51 slides along the guide groove 13 and finally falls into another set of limiting grooves 12, the elastic element 52 pushes the limiting post 51 to generate an impact when entering the groove. This provides clear tactile and auditory feedback to the operator through the housing of the operating end 2, so that the status information of whether the equipment has been fully unfolded or fully folded can be accurately perceived through force.

[0077] It can be noted that the opening edge of the limiting groove 12 and the connection position between the limiting groove 12 and the guide groove 13 are provided with a smoothly transitioning guide bevel or arc-shaped guide surface. When the limiting post 51 is embedded in the limiting groove 12, if the detection end 1 is subjected to an external force exceeding the preset threshold and rotates, the side wall of the limiting groove 12 converts the circumferential torque into axial pressure through the guide bevel, forcing the limiting post 51 to compress the elastic element 52 and retract axially into the operating end 2, thereby causing the top of the limiting post 51 to completely detach from the bottom recess of the limiting groove 12 and slide into the guide groove 13, so as to achieve automatic release of the locked state.

[0078] Furthermore, during use, when the probe 1 is in the unfolded probe state, the limiting post 51 extends into the limiting groove 12 under the push of the elastic element 52, thereby restricting the rotation of the probe 1 relative to the operating end 2. When it is necessary to store the probe device, the user applies a folding force to the probe 1, and the limiting post 51 is squeezed and guided by the side wall of the limiting groove 12, compressing the elastic element 52 to move axially, causing the limiting post 51 to exit the limiting groove 12, releasing the positioning state, and allowing the probe 1 to continue rotating to the storage position.

[0079] In one embodiment, the interior of the housing 6 is further provided with a storage compartment for storing the folded detection device. The outline of the storage compartment is designed based on the three-dimensional shape of the detection device after it is fully folded, and a flexible buffer layer may be attached to its inner wall surface.

[0080] It should be noted that there are no specific limitations on the storage compartment and its components; it can be a simple foam-lined groove, a strap-fixed structure, or a contoured groove that is integrally injection molded.

[0081] Preferably, a contoured inner groove is used that matches the outline of the folded detection device.

[0082] When in use, after the detection device has completed its field survey and been folded and stored, the operator puts the whole device into the storage compartment. The contoured inner groove perfectly wraps around the outer perimeter of the detection device, forming circumferential limits and physical isolation for key components such as the detection end 1, the operation end 2, the rotating shaft, and the power port 21.

[0083] During outdoor transport or vehicle bumps, the storage compartment can effectively absorb external impact energy, preventing the detection device from directly colliding with the detection terminal 7 or other hard objects inside the housing 6, and reducing the risk of shaft bending, housing breakage and wiring port damage.

[0084] Meanwhile, the contoured design, combined with the flexible buffer layer, can closely fit the surface of the detection device, forming a relatively sealed containment space. This prevents outdoor sand and dust from directly adhering to the shaft gaps and conductive contact areas. Together with the insulating blocks in the power-saving cleaning mechanism 3 and the power-off mechanism 4, it forms a multi-level dustproof barrier from the outside in, further reducing the probability of external pollutants invading the core conductive components and extending the environmental adaptability life of the equipment in harsh geotechnical exploration sites.

[0085] It should be noted that there are no specific limitations on the power port 21 and the cable connection structure; it can be a standard USB interface, a multi-core aviation plug, or a flexible contact crimp port, among other forms.

[0086] Preferably, a dedicated four-core aviation socket with a dustproof rubber ring is used.

[0087] Specifically, such as Figure 1 and Figure 2 As shown, the operating end 2 of the detection device is provided with a power port 21 on its upper part, and the rear of the detection terminal 7 is connected to the power port 21 on the detection device via a cable. The power port 21 is located on the upper part of the operating end 2, exposed and far away from the rotation area of ​​the rotating shaft. An elastic dustproof rubber ring is embedded inside the port. One end of the matching cable is fixedly connected to the signal output end of the detection terminal 7, and the other end is provided with an aviation plug that matches the power port 21.

[0088] By placing the power port 21 on the upper part of the operating end 2, it is not only convenient for surveyors to quickly plug and unplug the cable when holding the operating end 2 for mobile detection, but also to separate the port from the folding area of ​​the rotating shaft in space. This ensures that the cable stays away from the range of motion of the rotating shaft during repeated folding and opening of the detection device, avoiding the cable being squeezed by the rotating shaft, excessively bent or repeatedly stretched, which could cause the internal core wire to break, thus improving the service life of the cable assembly.

[0089] When the cable plug is inserted into the power port 21, the dustproof rubber ring is compressed and deformed elastically, filling the gap between the plug and the socket to form a sealed interface. In the case of severe dust in the geotechnical exploration site, it can effectively prevent fine dust from entering the internal metal contact parts of the power port 21 and maintain the stability of signal transmission.

[0090] Meanwhile, since the power port 21 is fixed to the operating end 2 and the detection terminal 7 is housed inside the housing 6, the two are connected by a flexible cable of sufficient length, allowing the detection device to be carried by the operator to any detection point within a certain radius of the housing 6. The terminal is placed inside the housing 6 as a fixed base station, which reduces the weight burden of the handheld end and ensures long-distance, low-loss transmission of the detection signal.

[0091] It should be noted that there are no specific limitations on the connection port 61 component; it can be a universal serial bus port, a multi-pin rectangular electrical connector, or a coaxial RF connector, etc.

[0092] Preferably, a multi-core aviation connector with a metal housing and a threaded locking structure is used.

[0093] Specifically, such as Figure 13 and Figure 14 As shown, a connection port 61 is provided at the rear of the housing 6, which is electrically connected to the detection terminal 7. The connection port 61 is fixedly installed on the rear wall of the housing 6. Its inner side is electrically connected to the power supply and signal transmission terminal of the detection terminal 7 through internal wires, and its outer side is used for pluggable connection with external charging equipment, data export equipment or external auxiliary sensors.

[0094] The connection port 61 is located at the rear of the enclosure 6, so that when the equipment is placed in the field, the operator can operate the detection terminal 7 facing the front of the enclosure 6, while the external cable extends out from the rear of the enclosure 6. The front and rear separation layout avoids the cable from getting tangled in the operating area, improving the convenience and safety of on-site operations.

[0095] The threaded locking structure ensures that the external plug and the connection port 61 remain firmly engaged in a vibrating environment, preventing loosening and power loss due to accidental dragging or vibration, and ensuring the continuous reliability of the detection operation.

[0096] In addition, as the only external interface for the enclosure 6 to exchange power and signals with the outside world, the equipped waterproof and dustproof protective cap can be tightened when not in use to effectively seal the internal metal contacts, preventing damp mud and corrosive dust in the rock and soil environment from eroding the inner core of the port, thereby maintaining the long-term good conductivity of the electrical connection point of the whole machine and reducing the probability of hidden faults such as interface oxidation and increased contact resistance.

[0097] In actual operation, the operator first opens the housing 6 and takes the detection device out of the storage compartment inside the housing 6. During the removal process, the contoured inner groove of the storage compartment always forms a protective wrap around the detection device in the stored state, ensuring that the rotating shaft and power port 21 are not bumped during transportation; after removal, the storage compartment is empty, and it will be stored again after the detection device has completed its operation and been folded up.

[0098] Subsequently, the cable plug extending from the rear of the detection terminal 7 is inserted into the power port 21 on the upper part of the operating terminal 2. The dustproof rubber ring deforms under pressure after insertion, filling the gap between the plug and the socket to form a seal and prevent dust from entering the internal metal contacts of the power port 21. The connection port 61 at the rear of the housing 6 has already completed its internal electrical connection with the detection terminal 7 before the entire unit is used. It does not need to be repeatedly plugged and unplugged during the survey and only serves as an external interface for charging or data exchange between the housing 6 and external equipment.

[0099] After the cable connection is completed, the operator holds the operating end 2 and flips the detection end 1 outward to unfold it around the pivot. During the unfolding process, the limiting post 51 of the limiting mechanism 5 slides relative to the guide groove 13 and compresses the elastic element 52 connected to it. After rotating to the detection working angle, the elastic element 52 rebounds and pushes the limiting post 51 into the corresponding limiting groove 12, locking the detection end 1 in a stable posture and resisting the angle drift caused by soft ground or vehicle vibration.

[0100] At the same time, the moving energized ring 41 of the power-off mechanism 4 rotates synchronously with the detection end 1. When the detection end 1 rotates to the unfolded working angle, the conductive arc segment of the moving energized ring 41 is exactly in contact with the conductive arc segment of the fixed energized ring 42, and the power supply circuit of the detection end 1 is automatically connected. The detection end 1 begins to emit a metal pipeline detection signal to the ground. The signal is transmitted back to the detection terminal 7 through the power port 21 on the upper part of the operation end 2 and the cable, completing the identification and display of the pipeline location.

[0101] During the entire stroke of the probe end 1 flipping outward, the torsion spring 33 of the power storage cleaning mechanism 3 continuously contracts as the probe end 1 and the operating end 2 rotate relative to each other, absorbing and storing rotational stress; the first ratchet 34 and the second ratchet 11 mesh with each other, restricting the ratchet disc 31 from rotating in the opposite direction, so that the elastic force inside the torsion spring 33 can be retained, waiting for subsequent release.

[0102] After completing the detection of an area, the operator rotates the probe end 1 inward for folding and storage. During the rotation, the first ratchet 34 and the second ratchet 11 remain engaged, and the torsion spring 33 maintains its charged state. When the probe end 1 rotates to the fully closed storage limit position, the moving ring insulating block of the power-off mechanism 4 moves to the outside of the fixed energized ring 42 with the rotation, and the insulating medium separates the two sets of conductive rings, automatically cutting off the power supply circuit of the probe end 1 and eliminating standby power consumption in the idle storage state.

[0103] At the same time, the first ratchet 34 disengages from the second ratchet 11, the torsion spring 33 releases the stored elastic stress, and drives the ratchet disc 31 to rotate around the shaft. Multiple cleaning strips 32 fixed to the outside of the ratchet disc 31 simultaneously perform directional scraping action along the outer wall of the shaft, forcibly removing the dust and mud accumulated in the gap of the shaft during the folding and unfolding process, and completing an active self-cleaning.

[0104] Finally, the operator puts the folded and self-cleaning detection device back into the storage compartment inside the box 6. The contoured inner groove wraps around the components of the detection device again, forming a protective layer. After closing the box 6, it can be transported to the next survey point.

[0105] Thus, the detection device completes a full work cycle from removal, unfolding, powering on for detection, folding and powering off, self-cleaning by accumulating energy, to storage and protection. The various mechanisms cooperate in an orderly manner without the need for additional human intervention.

[0106] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A device for detecting underground metal pipelines used in geotechnical engineering investigation, characterized in that, include: Detector end (1); The operating end (2) is rotatably connected to the detection end (1) via a rotating shaft; The energy storage cleaning mechanism (3) is disposed outside the rotating shaft and located between the detection end (1) and the operation end (2). The energy storage cleaning mechanism (3) absorbs and stores stress when the detection end (1) and the operation end (2) rotate relative to each other, and at least partially uses the stored stress to perform a cleaning action on the rotating shaft.

2. The underground metal pipeline detection device for geotechnical engineering investigation according to claim 1, characterized in that, The energy-saving cleaning mechanism (3) includes: Ratchet (31), the ratchet (31) being fitted onto the outside of the rotating shaft; The cleaning strip (32) is fixedly connected to one side of the ratchet disc (31) and the cleaning strip (32) is distributed circumferentially along the rotating shaft; The power-saving cleaning mechanism (3) also includes a chip removal groove (35), which is located at the bottom of the hinge area between the detection end (1) and the operation end (2) and is connected to the external space to guide the impurities scraped off by the cleaning strip (32) to be discharged. Torsion spring (33), the torsion spring (33) is disposed on one side of the ratchet disk (31), one end of the torsion spring (33) is movably connected to the operating end (2), and the other end of the torsion spring (33) is connected to the ratchet disk (31); The torsion spring (33) deforms to absorb and store stress when the probe end (1) and the operating end (2) rotate relative to each other.

3. The underground metal pipeline detection device for geotechnical engineering investigation according to claim 2, characterized in that, Multiple cleaning strips (32) are provided, and the multiple cleaning strips (32) are distributed at intervals along the circumference of the ratchet disk (31).

4. The underground metal pipeline detection device for geotechnical engineering investigation according to claim 2, characterized in that, The ratchet disc (31) has a first ratchet tooth (34) on the side facing the probe end (1), and the probe end (1) has a second ratchet tooth (11) on the side facing the ratchet disc (31). The first ratchet tooth (34) and the second ratchet tooth (11) mesh with each other.

5. The underground metal pipeline detection device for geotechnical engineering investigation according to any one of claims 1-4, characterized in that, It also includes a power-off mechanism (4), which is located outside the rotating shaft and inside the detection end (1). The power-off mechanism (4) is used to control the on / off of the electrical connection between the detection end (1) and the operation end (2).

6. The underground metal pipeline detection device for geotechnical engineering investigation according to claim 5, characterized in that, The power-off mechanism (4) includes: A dynamic contact ring (41) is electrically connected to the detection end (1); A constant-current ring (42) is installed outside the rotating shaft and electrically connected to the operating end (2); The moving energized ring (41) is coaxially arranged with the fixed energized ring (42), and the moving energized ring (41) is located outside the fixed energized ring (42).

7. The underground metal pipeline detection device for geotechnical engineering investigation according to claim 6, characterized in that, The interior of the moving ring (41) is filled with a moving ring insulating block, and the exterior of the fixed ring (42) is filled with a fixed ring insulating block; When the probe end (1) and the operation end (2) rotate relative to each other to the unfolded state, the moving contact ring (41) and the fixed contact ring (42) come into contact and conduct. When the probe end (1) and the operation end (2) are rotated relative to each other to the folded state, the moving ring insulating block contacts the fixed-current ring (42) to disconnect the electrical connection.

8. The underground metal pipeline detection device for geotechnical engineering investigation according to any one of claims 1-4, characterized in that, It also includes a limiting mechanism (5), which is disposed between the probe end (1) and the operating end (2) for limiting the rotation of the probe end (1) when the probe end (1) rotates relative to the operating end (2) to a predetermined angle.

9. The underground metal pipeline detection device for geotechnical engineering investigation according to claim 8, characterized in that, The limiting mechanism (5) includes: The limiting groove (12) is opened outside the detection end (1) and distributed around the rotating shaft. The limiting groove (12) includes a locking groove section with a locking sidewall (15) inclined toward the rotation direction of the detection end, which is used to make the limiting post (51) and the locking sidewall (15) form a self-locking abutment when the detection end is impacted. A limiting post (51) is provided inside the operating end (2), and the end of the limiting post (51) corresponds to the limiting groove (12); An elastic element (52) is disposed between the limiting post (51) and the operating end (2) for applying an elastic force toward the limiting post (51) in the direction of the limiting groove (12).

10. The underground metal pipeline detection device for geotechnical engineering investigation according to claim 9, characterized in that, The limiting groove (12) is provided in two sets, and the two sets of limiting grooves (12) are respectively located at the installation positions corresponding to the limiting post (51) when the probe end (1) is in the unfolded state and the folded state; The probe end (1) is also provided with a guide groove (13) on its outside. The guide groove (13) is located between the two sets of limiting grooves (12) and distributed around the rotating shaft. The guide groove (13) is used to guide the limiting post (51) to slide between the two sets of limiting grooves (12) when the probe end (1) rotates relative to the operating end (2).

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