CN112554867B - A recyclable embedded sensor installation and fixing system and installation method - Google Patents

Abstract

The invention relates to a recyclable embedded sensor mounting and fixing system which comprises a guide head, a special flange plate, a cylinder bearing sleeve, an eduction tube, a mounting rod and a sensor, wherein the cylinder bearing sleeve is of a hollow cylinder structure and comprises an inner sleeve and an outer sleeve, the front end surface of the cylinder bearing sleeve is connected with the guide head through the special flange plate, the rear end surface of the cylinder bearing sleeve is connected with the eduction tube through the special flange plate, the eduction tube is communicated with the inner sleeve, the front end surface of the mounting rod is connected with the rear end surface of the eduction tube, and the sensor is embedded in the inner sleeve. The using method comprises three steps of equipment assembly, sensor positioning, sensor recovery and the like. On one hand, the invention effectively reduces the steps of installation and construction, is convenient for installation, positioning and disassembly operation, and has high working efficiency and low labor intensity; on the other hand, compared with the traditional similar equipment, the invention effectively reduces additional auxiliary reagents and devices, reduces the participation and interference of other materials, has good installation and positioning stability and good recovery utilization rate and operation flexibility.

Description

A recyclable embedded sensor installation and fixing system and installation method

technical field

The invention relates to a recyclable embedded sensor installation and fixing system and an installation method, which belong to the technical field of geotechnical engineering detection.

Background technique

In the process of underground excavation of geotechnical engineering, due to the temporal and spatial uncertainty of disaster occurrence and the unexpected destructiveness, geotechnical engineering disasters have caused irreversible loss of life and immeasurable economic losses. It is urgent to promote disasters. Early warning methods and technical means, with the help of artificial intelligence and the Internet of Things in the new era, to improve monitoring equipment and monitoring methods in a timely manner. Geotechnical disaster management, control and early warning require super-era Internet of Things technology and equipment. In recent years, the Internet of Things and perception have been widely used in various fields, and it is more necessary to obtain the original in-situ experimental test data of specific projects in the new era driven by data—the era of big data. For a long time, although many methods have been adopted at home and abroad to solve the problems of safety monitoring and safety prevention in geotechnical engineering sites, such methods include stress observation and displacement observation, nondestructive testing, electromagnetic testing, radar monitoring, infrared observation, and microseismic monitoring. Affected by the limitations of detection methods, detection costs, passive damage and other factors, they often have little understanding of on-site working conditions, lack of interconnection and mutual knowledge, and it is difficult to know the damage situation, and it is impossible to effectively manage unknown accidents and disasters. And precise control, resulting in major production safety accidents.

The gradual periodicity of the geotechnical work area requires sustainable recycling. For example, CN201527480U will make the sensor difficult to recover, resulting in a lot of waste of hardware equipment; most of them use the grouting anchoring method, which is troublesome to operate, has many restrictions, and the installation angle is suitable For example, CN 110609316 A can only protect the sensor, but cannot realize the recovery function; for example, CN202041651U discloses a method for non-destructive real-time magnetic monitoring and forecasting disasters, but the monitoring results have large errors due to the interference of groundwater and electromagnetic radiation; For example, CN 105445784A and CN 110924389 A need to add an anchoring agent; for example, CN110007339 B and CN 110609316A accessories are slightly complicated and chaotic, resulting in unreasonable resource allocation, resource waste and equipment consumption. Some equipment and methods need to be supported by auxiliary devices, such as CN107167840 A; for example, CN109765605 A is an airbag type, which is easy to cause damage to the airbag during the advancing process, resulting in the uncertainty of inflation and finally blocking the normal installation. For example, the installation rod of CN 105445784 A optimizes the fixing problem in the process of Anza U coin, but it is not easy to fasten, causing falling off, thus seriously affecting the accuracy of detection operation.

Therefore, in view of this situation, it is urgent to develop a new sensor installation and fixation system to meet the needs of geotechnical engineering geological inspection work.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the present invention provides a recyclable embedded sensor installation and fixing system and method, so as to achieve the purpose of improving the accuracy of geological detection operations and the recycling rate of equipment.

In order to achieve the above object, the present invention is realized by the following technical solutions:

A recyclable embedded sensor installation and fixing system, including a guide head, a special flange, a cylinder bearing sleeve, a lead-out pipe, a mounting rod, and a sensor, the cylinder bearing sleeve is a hollow cylinder structure, including an inner sleeve Tube and outer casing, the outer casing is wrapped around the inner casing and distributed coaxially with the inner casing. The front end face of the cylindrical bearing casing is connected to the guide head through a special flange plate and is coaxially distributed, and the rear end face passes through a special flange. The disc is connected with the lead-out pipe, and the lead-out pipe is connected with the inner casing. The guide head, the special flange plate, the cylinder bearing casing, and the lead-out pipe are coaxially distributed. The sensor can be flexibly installed in the inner sleeve, and its wires are discharged out of the rear end surface of the cylindrical bearing sleeve through the lead-out pipe and the installation rod, and led out through the inner hole of the installation rod.

Further, the special flange plate includes an outer bracket, a radial plate, a guide plate, a positioning plate, a positioning column and a slider, wherein the outer bracket is a cylindrical tubular structure coaxially distributed with the cylinder bearing sleeve. , and the outer support sleeve is wrapped around the two ends of the cylinder bearing sleeve, and is connected with the outer sleeve of the cylinder bearing sleeve and distributed coaxially. The radial disk, the guide disk and the positioning disk are all annular plate structures. , embedded in the outer support sleeve and distributed coaxially with the outer support sleeve, the guide rail disk is located between the radial disk and the positioning disk, and the positioning disk is embedded in the front end surface of the outer support sleeve, the radial disk and the positioning disk It is fixedly connected with the inner surface of the outer support sleeve, and the guide rail plate is slidably connected with the inner surface of the outer support sleeve. The radial disk is provided with at least three guide chutes evenly distributed around the axis of the radial disk, and the guide chutes are arranged along the radial disk. The guide rails are distributed in the radial direction, and the length is 50% to 90% of the radius of the radial disk. The guide rails are provided with guide rails corresponding to the positions of the guide chutes, and each guide rail is an arc-shaped structure. A guide hole is set on the side wall of the outer bracket corresponding to the guide chute, and the guide hole is located between the radial disk and the guide disk. , the positioning column is coaxially distributed and slidably connected to the guide hole, and the axis of the positioning column is distributed parallel to the guide chute, and the rear end surface of the positioning column is respectively connected to the guide chute of the radial disk and the guide slide of the guide disk through the slider. The rails are slidably connected, the front end surface is located outside the outer support sleeve, and the length of the portion of the positioning column located on the outer side of the outer support sleeve is 10% to 90% of the length of the positioning column, and not less than 5 mm.

Further, in the special flange plate, the guide rail plate and the positioning plate of the special flange plate located at the front end surface of the cylindrical bearing sleeve are wrapped outside the guide head and are distributed coaxially, wherein the positioning plate and the outside of the guide head are arranged coaxially. The surface is slidingly connected, and the guide plate is fixedly connected with the outer surface of the guide head; the guide plate and the positioning plate of the special flange located at the rear end of the cylindrical bearing sleeve are wrapped outside the lead-out pipe and distributed coaxially, and the positioning plate is covered with Outside the outlet pipe and slidingly connected, the guide rail plate is fixedly connected with the outer surface of the outlet pipe.

Further, the installation rod includes a guide rod and a connecting nut, at least two of the guide rods are in a group, each guide rod is a hollow columnar structure, and the inner surfaces of both ends of the guide rod are provided with connecting threads, and the adjacent two The guide rods are connected and distributed coaxially by connecting nuts, and the connecting nuts are embedded in the guide rods.

Further, the guide head has a conical structure, the bottom diameter of which is 50% to 90% of the inner diameter of the cylindrical bearing sleeve, and the front end surface exceeds the front end surface of the cylindrical bearing sleeve by at least 5 cm.

Further, at least two adjustment guide rails are arranged on the outer surface of the inner sleeve of the cylindrical bearing sleeve, and the adjustment guide rails cover the outside of the inner sleeve, are coaxially distributed with the inner sleeve and evenly distributed along the axis direction of the inner sleeve, The inner sleeve is slidably connected to the outer sleeve through the adjusting guide rail, the inner sleeve is wrapped outside the sensor and distributed coaxially with the sensor, and the sensor and the inner sleeve are abutted against and slidably connected.

A method for using a recyclable embedded sensor installation and fixing system, comprising the following steps;

S1, equipment assembly, firstly select the guide head, special flange, cylinder bearing sleeve, lead-out pipe, installation rod that meet the required type and quantity according to the inner diameter and depth of the drill hole, and then install and clamp the sensor into the cylinder bearing sleeve, and then connect the two ends of the cylinder bearing sleeve to the guide head and the outgoing pipe through special flanges, respectively, and discharge the wire of the sensor from the outgoing pipe on the rear end of the cylinder bearing sleeve. And it is electrically connected with the external monitoring system, and finally the installation rod is connected with the rear end surface of the lead-out pipe to complete the assembly of the present invention;

S2, sensor positioning, after completing step S1, place the guide head and the cylinder bearing sleeve into the drilling hole to be inspected, and push the installation device to a specific position through the installation rod, and then drive the guide head and the cylinder bearing sleeve. The pipe is embedded in the drilled hole, and then the cylinder carrying sleeve is driven to rotate by the installation rod. During the rotation, the outer sleeve of the cylindrical carrying sleeve drives the outer support sleeve, radial disk and positioning disk of the special flange plate together. Rotating together, during the rotation process, the arc-shaped guide rail of the guide plate provides guiding and driving force for the positioning column. The bracket protrudes out, and the front end face of each positioning column is in contact with the borehole wall, so as to meet the needs of the present invention for positioning, tightening, and supporting operations, and after completing the positioning, the geology-related detection operation can be performed by the sensor;

S3, the sensor is recovered. After the detection operation is completed, the appropriate length of the installation rod is selected again and rotated in the opposite direction with the step S2. During the rotation process, each positioning column is driven by the guide rail to retract into the outer support sleeve, and the present invention is combined with the drilling It can be loosened during the time, and finally the whole of the present invention can be pulled out from the drilling hole through the installation rod and the connected cable, and the sensor recovery operation can be completed.

On the one hand, the system structure and production process of the present invention are simple, and the installation and construction steps are effectively reduced, the installation and positioning and disassembly operations are convenient, the work efficiency is high, and the labor intensity is low; Reduce or replace the detection sensor used to reinforce the bottom of the hole with anchoring agent and chemical coagulant, reduce the participation and interference of other materials, avoid secondary pollution, and have good installation and positioning stability, good recycling rate and operational flexibility, so It effectively reduces the detection cost and greatly improves the work accuracy of the detection operation.

Description of drawings

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

1 is a schematic diagram of the system structure of the present invention;

Figure 2 is a schematic diagram of the structure of a special flange;

Fig. 3 is the schematic diagram of radial disk structure;

Figure 4 is a schematic diagram of the structure of the guide rail;

Figure 5 is a schematic diagram of the structure of the installation rod;

FIG. 6 is a flow chart of the method of the present invention.

Detailed ways

In order to make the technical means, creative features, achievement goals and effects realized by the present invention easy to understand, the present invention will be further described below with reference to the specific embodiments.

As shown in Figures 1 to 5, a recyclable embedded sensor installation and fixing system includes a guide head 1, a special flange 2, a cylindrical bearing sleeve 3, an outlet pipe 4, a mounting rod 5, and a sensor 6. The cylinder carrying sleeve 3 is a hollow cylinder structure, including an inner sleeve 31 and an outer sleeve 32. The outer sleeve 32 is wrapped around the inner sleeve 31 and is coaxially distributed with the inner sleeve 31. The front end of the cylinder carrying sleeve 3 The surface is connected to the guide head 1 through a special flange 2 and is coaxially distributed, and the rear end face is connected to the outgoing pipe 4 through the special flange 2, and the outgoing pipe 4 is connected to the inner sleeve 31. The guide head 1, the special flange The disk 2, the cylinder carrying sleeve 3, and the outlet pipe 4 are coaxially distributed, the front end surface of the installation rod 5 is connected to the rear end surface of the outlet pipe 4 and distributed coaxially, the sensor 6 can be nested in the inner sleeve 31, The lead wire 7 is discharged out of the rear end surface of the cylindrical support sleeve 3 through the lead-out pipe 4 and the installation rod 5 .

It is important to note that the special flange 2 includes an outer bracket 21, a radial plate 22, a guide plate 23, a positioning plate 24, a positioning column 25 and a slider 26, wherein the outer bracket 21 is for bearing with the column. The cylindrical tubular structure of the casing 3 is coaxially distributed, and the outer support sleeve 21 is wrapped around the two ends of the cylindrical bearing casing 3, and is connected with the outer casing 32 of the cylindrical bearing casing 3 and distributed coaxially. The steering plate 22 , the guide plate 23 and the positioning plate 24 are all annular plate-like structures, embedded in the outer bracket 21 and distributed coaxially with the outer bracket 21 . The guide plate 23 is located between the radial plate 22 and the positioning plate 24 . and the positioning plate 24 is embedded in the front end surface of the outer bracket 21, the radial plate 22 and the positioning plate 24 are fixedly connected with the inner surface of the outer bracket 21, and the guide plate 23 is slidably connected with the inner surface of the outer bracket 21, so The radial disk 22 is provided with at least three guide chutes 27 evenly distributed around the axis of the radial disk 22. The guide chutes 27 are distributed along the radial direction of the radial disk 22, and the length is 50% of the radius of the radial disk 22. ~90%, the guide rails 23 are provided with guide rails 28 corresponding to the positions of the guide grooves 27, and each guide rail 28 is an arc-shaped structure, and the guide grooves 27 correspond to the outer bracket 21 side Guide holes 29 are provided on the wall, and the guide holes 29 are located between the radial disk 22 and the guide disk 23. The number of the positioning posts 25 is the same as the number of the guide holes 29, and each guide hole 29 is provided with a positioning post 25. The positioning column 25 is coaxially distributed and slidably connected to the guide hole 29 , and the axis of the positioning column 25 is parallel to the guide chute 27 . 27 and the guide rail 28 of the guide rail plate 23 are slidably connected, the front end surface is located outside the outer support sleeve 21, and the length of the positioning column 25 at the outer part of the outer support sleeve 21 is 10% to 90% of the length of the positioning column 25, and not less than 5 mm.

It should be noted that, in the special flange plate 2, the guide rail plate 23 and the positioning plate 24 of the special flange plate 2 located at the front end surface of the cylindrical bearing sleeve 3 are wrapped outside the guide head 1 and are coaxially distributed. , wherein the positioning plate 24 is slidably connected with the outer surface of the guide head 1, and the guide plate 23 is fixedly connected with the outer surface of the guide head 1; It is wrapped outside the lead pipe 4 and distributed coaxially, wherein the positioning plate 24 is wrapped outside the lead pipe 4 and is slidably connected, and the guide plate 23 is fixedly connected with the outer surface of the lead pipe 4 .

In this embodiment, the installation rod 5 includes a guide rod 51 and a connecting nut 52. There are at least two guide rods 51. Multiple sets of guide rods can be selected to adapt to engineering environments with different hole depths. Each guide rod 51 is a It has a hollow cylindrical structure, and the inner surfaces of both ends of the guide rod 51 are provided with connecting threads 53 .

In this embodiment, the guide head 1 is a conical structure, the bottom diameter of which is 50% to 90% of the inner diameter of the cylindrical bearing sleeve 3, and the front end surface exceeds the front end surface of the cylindrical bearing sleeve 3 by at least 5 cm.

In this embodiment, at least two adjustment guide rails 33 are provided on the outer surface of the inner sleeve 31 of the cylindrical bearing sleeve 3 , and the adjustment guide rails 33 cover the inner sleeve 31 and are distributed coaxially with the inner sleeve 31 . and evenly distributed along the axis of the inner sleeve 31, and the inner sleeve 31 is slidably connected to the outer sleeve 32 through the adjusting guide rail 33, the inner sleeve 31 is additionally wrapped outside the sensor 6 and distributed coaxially with the sensor 6, And the sensor 6 and the inner sleeve 31 are abutted against and slidably connected.

As shown in Figure 6, a method for using a recyclable embedded sensor installation and fixing system includes the following steps;

S1, equipment assembly, first, according to the inner diameter of the drill hole, select the guide head, special flange, cylinder bearing sleeve, lead pipe, and installation rod that meet the needs of the quality and quantity of use, and then install and position the sensor with a suitable diameter to the column. In the body bearing sleeve, the two ends of the cylinder bearing sleeve are respectively connected to the guide head and the outlet pipe through special flanges, and the wire of the sensor is discharged from the outlet pipe on the rear end of the cylinder bearing sleeve, and is connected with the guide head and the outlet pipe. The external monitoring system is electrically connected, and finally the installation rod is connected to the rear end surface of the outlet pipe to complete the assembly of the present invention;

S2, sensor positioning, after the completion of step S1, place the guide head and the cylinder bearing sleeve together at the hole of the drilling hole to be tested, and then drive the guide head and the cylinder bearing through the installation rod without rotating in the drilling direction. The casing is embedded in the borehole until all the recoverable devices are pushed to the bottom of the hole, and then the cylindrical bearing casing is driven to rotate in a certain direction through the installation rod. During the rotation process, the outer casing of the cylindrical bearing casing is driven together The outer bracket of the special flange plate, the radial plate and the positioning plate rotate together. During the rotation, the arc-shaped guide rail of the guide plate provides guiding and driving force for the positioning column, and the guide plate drives the positioning column along the diameter. The guide chute and guide rail of the steering plate and the guide plate protrude from the outer support sleeve, and the front end face of each positioning column is in contact with the wall of the drilling hole, so as to meet the needs of the positioning operation of the present invention, and can be completed after the positioning is completed. Geo-related detection operations through sensors;

S3, the sensor is recovered. After the detection operation is completed, the rod is installed again to rotate in the opposite direction of step S2. During the rotation process, each positioning column is driven by the guide rail to retract into the outer support sleeve, and the invention is released from the drilling hole. , and finally pull out the whole of the present invention from the drilling hole through the installation rod and the sensor cable, and then the sensor recovery operation can be completed.

On the one hand, the system structure and production process of the present invention are simple, and the installation and construction steps are effectively reduced, the installation and positioning and disassembly operations are convenient, the work efficiency is high, and the labor intensity is low; Reduce or replace the detection sensor used to reinforce the bottom of the hole with anchoring agent and chemical coagulant, reduce the participation and interference of other materials, avoid secondary pollution, and have good installation and positioning stability, good recycling rate and operational flexibility, so It effectively reduces the detection cost and greatly improves the work accuracy of the detection operation.

Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements can be made to the present invention without departing from the spirit and scope of the present invention. Such variations and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (2)

1. A recyclable embedded sensor installation and fixation system is characterized in that: the recyclable embedded sensor installation and fixation system comprises a guide head, a special flange, a cylindrical bearing sleeve, an outlet pipe, a mounting Rod and sensor, the cylindrical bearing casing is a hollow cylindrical structure, including an inner casing and an outer casing, the outer casing is wrapped around the inner casing and distributed coaxially with the inner casing, and the column carries The front end face of the casing is connected with the guide head through a special flange and is coaxially distributed, and the rear end face is connected with the outgoing pipe through a special flange, and the outgoing pipe is connected with the inner casing. The guide head, the special flange The disk, the cylinder carrying sleeve, and the extraction pipe are coaxially distributed, the front end surface of the installation rod is connected to the rear end surface of the extraction pipe and is coaxially distributed, the sensor is clamped in the inner sleeve, and its wires pass through the extraction pipe and are installed The rod is discharged out of the rear end surface of the cylinder bearing sleeve; the installation rod includes a guide rod and a connecting nut, and there are at least two guide rods, each guide rod is a hollow cylindrical structure, and the inner surfaces of both ends of the guide rod are provided with Connecting thread, two adjacent guide rods are connected and coaxially distributed by connecting nut, and the connecting nut is embedded in the guide rod; meanwhile, the guide head is a conical structure, and its bottom diameter is the inner diameter of the cylindrical bearing sleeve 50%~90%, the front end surface is at least 5 cm beyond the front end surface of the cylindrical bearing sleeve; in addition, the adjusting guide rails are wrapped outside the inner sleeve, and are distributed coaxially with the inner sleeve and evenly distributed along the axis of the inner sleeve, and The inner sleeve is slidably connected with the outer sleeve through the adjusting guide rail, the inner sleeve is wrapped outside the sensor and is distributed coaxially with the sensor, and the sensor and the inner sleeve are abutted against and slidably connected to the wall of the inner sleeve. The special flange plate includes an outer bracket, a radial plate, a guide plate, a positioning plate, a positioning column and a slider, wherein the outer bracket is a cylindrical tubular structure coaxially distributed with the cylinder bearing sleeve, and the outer bracket is Covered on both ends of the cylindrical bearing sleeve, connected with the outer sleeve of the cylindrical bearing sleeve and distributed coaxially, the radial disk, the guide disk and the positioning disk are all annular plate-shaped structures, embedded in the outer support Inside the sleeve and coaxially distributed with the outer support sleeve, the guide rail disk is located between the radial disk and the positioning disk, and the positioning disk is embedded in the front end surface of the outer support sleeve, the radial disk and the positioning disk The surfaces are fixedly connected, the guide rail disc is slidably connected to the inner surface of the outer support sleeve, the radial disc is provided with at least three guide chutes that are evenly distributed around the axis of the radial disc, and the guide chutes are distributed along the radial direction of the radial disc, and The length is 50% to 90% of the radius of the radial disc. The guide rails are provided with guide rails corresponding to the positions of the guide chutes, and each guide rail is an arc-shaped structure. A guide hole is arranged on the side wall of the bracket. The guide hole is located between the radial disk and the guide disk. The number of the positioning posts is the same as the number of the guide holes. The guide holes are coaxially distributed and slidably connected, and the axis of the positioning column is distributed in parallel with the guide chute. It is located outside the outer support sleeve, and the length of the positioning column located at the outer part of the outer support sleeve is 10% to 9% of the length of the positioning column. 0%, and not less than 5 mm; in the special flange, the guide rail and the positioning plate of the special flange located at the front end surface of the cylindrical bearing sleeve are wrapped outside the guide head and distributed coaxially. The positioning plate is slidably connected to the outer surface of the guide head, and the guide plate is fixedly connected to the outer surface of the guide head; the guide plate and the positioning plate of the special flange plate located at the rear end surface of the cylindrical bearing sleeve are wrapped outside the outlet pipe and are coaxially distributed , wherein the positioning plate is wrapped around the outgoing pipe and is slidably connected, and the guide plate is fixedly connected with the outer surface of the outgoing pipe. 2. A method of using a recyclable embedded sensor installation and fixation system according to claim 1, wherein the use of the recyclable embedded sensor installation and fixation system comprises the following steps; S1, equipment assembly, first select the guide head, special flange, cylinder bearing sleeve, lead-out pipe, and installation rod that meet the needs of the quality and quantity of use according to the inner diameter of the drilled hole and the actual hole depth, and then install and clamp the sensor to the In the cylinder bearing sleeve, the two ends of the cylinder bearing sleeve are respectively connected to the guide head and the outgoing pipe through special flanges, and the wire of the sensor is discharged from the outgoing pipe on the rear end of the cylinder bearing sleeve, and It is electrically connected with the external monitoring system, and finally the installation rod is connected with the rear surface of the outlet pipe to complete the system assembly; S2, sensor positioning, after the completion of step S1, place the guide head and cylinder bearing casing into the drilling hole to be inspected, and push the installation device to a specific position at the bottom of the hole through the installation rod, and then drive the guide head and cylinder. Carry the casing into the borehole, and then drive the cylindrical supporting casing to rotate through the installation rod. During the rotation, the outer casing of the cylindrical supporting casing drives the outer bracket, radial plate and positioning of the special flange together with The disks rotate together. During the rotation, the arc-shaped guide rail of the guide disk provides guiding and driving force for the positioning column, and the guide disk drives the positioning column along the radial disk, the guide chute of the guide disk and the guide sliding The outer support sleeve protrudes, and the front end surface of each positioning column is in contact with the wall of the drilling hole, so as to meet the needs of the sensor positioning, tightening and clamping operations, and after the positioning is completed, the geological related detection operation can be carried out by the sensor; S3, the sensor is recovered. After the detection operation is completed, the installation rod is rotated in the opposite direction of step S2 again. During the rotation process, each positioning column is driven by the guide rail to retract into the outer support sleeve, so that the sensor and the drilling hole are released. , and finally pull the whole device system out of the hole through the installation rod and the sensor extension cable to complete the sensor recovery operation.

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