A borehole imager probe imaging protection device and method of detection

Abstract

The present application belongs to the field of borehole imaging detection, and particularly relates to a borehole imaging instrument probe imaging protection device and a detection method. The device comprises a borehole imaging instrument probe imaging protection device, which comprises a protection cover used for covering the probe when pushing in the borehole. The distal end of the protection cover is provided with a small sleeve, and the proximal end of the protection cover is uniformly fixed with a plurality of spring leaf clamping legs in the circumferential direction. The detection method keeps the probe closed when pushing, covers the probe with the protection cover, and then pulls the pushing rod from inside to outside. The probe gradually leaves the protection cover and starts to perform imaging detection from inside to outside. The device of the present application has simple structure and low cost, and can keep the surface of the probe clean when pushing the probe in the borehole. The method of the present application changes the traditional detection method from outside to inside to imaging detection from inside to outside, ensures clear probe imaging and accurate detection, and solves the technical problems of discontinuous detection process, low efficiency and the like caused by repeated cleaning of the probe.

Description

Technical Field

[0001] This invention belongs to the field of borehole imaging detection technology, specifically relating to an imaging protection device and detection method for a borehole imaging probe. Background Technology

[0002] Borehole imaging technology is an imaging logging technique that utilizes optical imaging principles. Combined with video acquisition and image processing, it not only enables real-time observation of the borehole interior but also allows for further detailed processing of the acquired images and videos using image processing algorithms to obtain panoramic borehole geological maps. This provides reliable data support for subsequent engineering geological analysis to determine the borehole's geological characteristics. With the continuous development of science and technology and the increasing demand for high-precision geological information, borehole imaging technology has been widely applied in civil engineering, mine management, and water conservancy construction, providing scientific basis for design and construction. It has become an important tool in engineering surveying.

[0003] However, during borehole imaging, studies have shown that if the surrounding rock is relatively intact, the borehole formation is good, and the borehole cleaning is thorough, the imaging effect is excellent. But if the surrounding rock is fragmented, especially with muddy interlayers, and the borehole cleaning is inadequate, resulting in poor borehole quality, the probe, being at the very front, is easily covered by mud, coal dust, or water stains as it advances deeper. This leads to blurred or completely invisible images, or even lens damage. Furthermore, observation boreholes are generally small, making probe cleaning difficult. Removing the probe for cleaning would disrupt the continuity of imaging, reduce accuracy and effectiveness, and require repeated installation, which is inconvenient. Based on the above, current anti-fouling measures for mine borehole imaging probes mostly involve installing a structure on the outside of the probe that can continuously wipe away dirt from the probe lens surface. For example, Chinese patent CN214145473U discloses an anti-fouling device for a mine borehole imaging probe, including a probe, a lens, and a non-interference reciprocating cleaning component. The non-interference reciprocating cleaning component is located on the probe, and the lens is located on one side of the probe. The non-interference reciprocating cleaning component includes a drive half-gear, a drive frame, a drive motor, a connecting ring, and a contact cleaning claw. The drive frame is slidably mounted on the probe, and the drive half-gear is rotatably mounted on the probe. The drive frame contains a rack and a rack, and the drive half-gear meshes with either rack or rack. This utility model belongs to the field of mining equipment technology, specifically an anti-fouling device for a mine borehole imaging probe that improves the cleanliness of the lens through a contact cleaning method using a contact cleaning claw, and avoids interference with lens imaging through the reciprocating drive characteristics of the non-interference reciprocating cleaning component, allowing cleaning without moving the probe.

[0004] Most current technologies involve disruptive improvements or redesigns to existing probes, resulting in complex structures, relatively inconvenient operation, and difficulty for general engineering technicians to understand. Moreover, production costs are often high, making widespread application difficult. Furthermore, wiping the camera to clean it from peat powder, water stains, etc., in boreholes is not an ideal method for preventing or protecting it from contamination. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a borehole imaging probe imaging protection device and detection method, which can not only ensure clear imaging during probe detection, but also protect the probe lens from damage by broken rocks.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An imaging protection device for a borehole imaging probe includes a protective cover for covering the probe when it is pushed into the borehole. The distal end of the protective cover has a small sleeve, which is closed at the distal end, and the probe can be inserted into the small sleeve. The proximal end of the protective cover has an opening for the probe to enter. A plurality of spring-loaded retaining legs are uniformly fixed circumferentially at the proximal end of the protective cover, with the proximal ends of the spring-loaded retaining legs being free ends. The spring-loaded retaining legs have a first working state of being retracted and a second working state of being open.

[0008] When the spring clips are in the first working state, the diameter of the circumscribed circle of the proximal end of all the spring clips is smaller than the diameter of the drilling channel, so that the spring clips can be pushed along the drilling channel towards the bottom of the drill hole; when the spring clips are in the second working state, the diameter of the circumscribed circle of the proximal end of all the spring clips is larger than the diameter of the drilling channel, so that the spring clips cannot disengage from the bottom of the drill hole.

[0009] This invention proposes another imaging protection device for a borehole imaging probe, comprising a protective cover for covering the probe when pushed into the borehole. The protective cover includes an outer sleeve and a spring sleeve slidably disposed within the outer sleeve. A small sleeve is provided at the distal end of the outer sleeve, and the distal end of the small sleeve is closed, allowing the probe to be inserted into the small sleeve. The proximal end of the protective cover has an opening for the probe to enter. A top rod is fixed at the distal end of the spring sleeve, and the top rod is disposed outside the small sleeve, extending beyond the distal end of the outer sleeve. The total length of the top rod and the spring sleeve is greater than the length of the outer sleeve. A plurality of spring clips are uniformly fixed circumferentially at the proximal end of the spring sleeve, and the proximal ends of the spring clips are free ends. The spring clips have a first working state of being retracted within the outer sleeve and a second working state of being extended outside the outer sleeve.

[0010] When the spring clips are in the first working state, the spring sleeve is close to the far end of the outer sleeve, and all the spring clips are at least partially retracted inside the outer sleeve. The diameter of the circumscribed circle of the proximal end of all the spring clips is smaller than the diameter of the drilling channel, so that the spring clips can be pushed along the drilling channel towards the bottom of the borehole. When the spring clips are in the second working state, the spring sleeve approaches the proximal end of the outer sleeve, and the spring clips extend at least partially out of the outer sleeve. The diameter of the circumscribed circle of the proximal end of all the spring clips is larger than the diameter of the drilling channel, so that the spring clips cannot disengage from the bottom of the borehole.

[0011] Furthermore, the number of reed clips is eight, and they are all of equal length.

[0012] Furthermore, a soft pad is provided at the distal end of the small sleeve.

[0013] Furthermore, after the reed clip legs are opened, the diameter of the circumscribed circle at the proximal end is 4-6 mm larger than the diameter of the drilled channel.

[0014] Furthermore, the minimum inner diameter of the spring sleeve is smaller than the outer diameter of the small sleeve. When the spring sleeve abuts against the small sleeve, the free end of the spring clip is accommodated inside the outer sleeve.

[0015] Furthermore, the number of top rods is 2 to 3.

[0016] Furthermore, the proximal inner diameter of the outer sleeve is smaller than the distal inner diameter of the outer sleeve, the proximal inner diameter of the spring sleeve is smaller than the distal inner diameter of the outer sleeve, and the distal inner diameter of the spring sleeve is larger than the proximal inner diameter of the outer sleeve, in order to prevent the spring sleeve from falling out of the outer sleeve.

[0017] Furthermore, when the reed sleeve moves to the far end of the outer sleeve to its maximum extent, the free end of the reed clamp leg rests on the inner wall of the near end of the outer sleeve.

[0018] The present invention also provides a borehole imaging detector method, using any of the aforementioned borehole imaging detector probe imaging protection devices, comprising the following steps:

[0019] Step 1: Keep the probe closed, cover the front end of the probe with the protective cover, put the spring clip into the first working state, and push the protective cover and probe along the drilling channel to the bottom of the borehole;

[0020] Step 2: Put the spring clip into the second working state, with the free end of the spring clip open and supported on the hole wall at the bottom of the drill hole;

[0021] Step 3: Activate the probe and gradually pull the push rod from the inside out. The probe will gradually move away from the protective cover and begin imaging detection from the inside out.

[0022] The working principle of this invention is as follows: Because the borehole is repeatedly cleaned, swept, or stirred at the bottom after drilling, the diameter of the bottom is slightly larger and irregular than the diameter of the front section. Based on this, the invention designs a protective device and detection method that employs spring-loaded legs similar to those of an elastic octopus, with a protective cover at the front of each leg. When the protective cover is placed over the probe, and the probe is gradually pushed into the borehole section by section using a push rod, the spring-loaded legs are constricted by the borehole wall or the protective cover and retract until they are pushed to the bottom of the borehole. Since the diameter of the bottom of the borehole is slightly larger than the front section, the spring-loaded legs can open within the space at the bottom of the borehole, and the free end of the spring-loaded legs is then supported on the inner wall of the bottom of the borehole. Then, the probe is pulled outward by the push rod. Since the spring clip is stuck on the bottom wall of the borehole, the protective cover is left at the bottom of the borehole. As the push rod is pulled out, the probe can be pulled out of the protective cover and begin imaging detection from the inside out. During the process of the probe being pulled back outward, the probe acts as the tail end of the forward direction, which can greatly reduce the occurrence of the probe being covered by mud, coal powder, or water stains, and keep the probe surface clean.

[0023] The beneficial effects of this invention are:

[0024] The device of the present invention has a simple structure, low cost, can be conveniently and reliably used for one-time use, and is safe to use. It can protect the probe when pushing it into the borehole and keep the probe surface clean. When pushed to the bottom of the borehole, the spring clip can automatically unfold and support the probe in the space at the bottom of the borehole, ensuring that the probe is separated from the protective cover when the probe is pulled out and the protective cover is not taken out.

[0025] This invention changes the traditional outside-in detection method. First, the probe is pushed to the bottom of the borehole under the protection of a protective cover. Then, the probe is activated to perform imaging detection from the inside out. This prevents the probe from hitting mud, coal dust, or other foreign objects during retrieval, greatly reducing lens contamination and ensuring clear imaging and accurate detection. It solves the technical problems of discontinuous detection and low efficiency caused by repeated probe cleaning. This invention is convenient, quick, and improves work efficiency, observation accuracy, and effectiveness, providing better technical support for effectively controlling the deformation of rheologically fractured surrounding rock masses. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0027] Figure 1 This is a schematic diagram illustrating an embodiment of the present invention, Example 1.

[0028] Figure 2This is a schematic diagram illustrating the application of Embodiment 1 of the present invention.

[0029] Figure 3 This is a schematic diagram of the unfolding process of the spring clip leg in Embodiment 2 of the present invention.

[0030] Figure 4 This is a side view of the structure of Embodiment 2 of the present invention.

[0031] Figure 5 This is a schematic diagram illustrating the application of Embodiment 2 of the present invention.

[0032] Figure 6 This is a result image of a tunnel in Yunnan Province that was detected using a traditional push-type detection method.

[0033] Figure 7 The image shows the result of applying this invention to a tunnel in Yunnan.

[0034] Figure 8 Images of some locations in a tunnel in Yunnan Province obtained using traditional push-type detection.

[0035] Figure 9 A partial site image of a tunnel in Yunnan Province for which this invention is applied.

[0036] In the diagram, 1-Spring clip leg, 2-Spring sleeve, 3-Top rod, 4-Outer sleeve, 5-Small sleeve, 6-Soft pad, 7-Probe, 8-Push rod, 9-Surrounding rock, 10-Drilling channel, 11-Retaining ring, 12-First protrusion, 13-Second protrusion, 14-Protective cover. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art are within the scope of protection of the present invention.

[0038] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0039] It should be noted that: (1) Each component of this patent has one end facing the bottom of the borehole as the far end and one end facing the borehole opening as the near end. (2) The borehole imaging probe protection device is used in conjunction with the borehole imaging probe, which is referred to as the probe. The protection device can be made in different sizes to be suitable for various specifications of borehole imaging probes on the market. (3) Since the borehole is repeatedly cleaned, swept, or stirred at the bottom after drilling, the diameter of the bottom of the borehole is slightly larger and irregular than the diameter of the front section. In order to distinguish between the front section of the borehole and the bottom section of the borehole, the front section of the borehole and the slightly larger diameter part of the bottom section of the borehole are named separately as the borehole channel 10 and the bottom of the borehole, respectively.

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0041] Example 1

[0042] In this embodiment, the protective cover 14 is a single-layer structure, which is the simplest structure.

[0043] like Figures 1 to 2 As shown, a borehole imaging probe protection device includes a protective cover 14 for covering the probe 7 when pushed into the borehole. The distal end of the protective cover 14 is provided with a small sleeve 5, which is closed, and the probe 7 can be inserted into the small sleeve 5. The proximal end of the protective cover 14 is provided with an opening for the probe 7 to enter. A plurality of spring-loaded legs 1 are uniformly fixed circumferentially at the proximal end of the protective cover 14, and the proximal ends of the spring-loaded legs 1 are free ends. The spring-loaded legs 1 have a first working state of being retracted and a second working state of being open.

[0044] When the spring clip 1 is in the first working state, the diameter of the circumscribed circle of the proximal end of all the spring clip 1 is smaller than the diameter of the drilling channel 10, so that the spring clip 1 can be pushed along the drilling channel 10 towards the bottom of the drill hole; when the spring clip 1 is in the second working state, the diameter of the circumscribed circle of the proximal end of all the spring clip 1 is larger than the diameter of the drilling channel 10, so that the spring clip 1 cannot disengage from the bottom of the drill hole.

[0045] like Figure 1 , Figure 2 As shown, the spring clip 1 is cylindrical or barrel-shaped, and the spring clip 1 is integrally connected to the protective cover 14. The number of spring clip 1 is 8 to 12 and they are all of equal length. The included angle between each spring clip 1 and the protective cover 14 is the same, so that each spring clip 1 is stretched outward to the same degree.

[0046] like Figure 1 , Figure 2As shown, a soft pad 6 of 4-6 mm is provided at the distal end of the small sleeve 5 to prevent the lens at the front end of the probe 7 from being scratched or damaged. Alternatively, a soft strip can be provided on the inner peripheral wall of the small sleeve 5 to prevent scratching of the outer peripheral surface of the probe 7.

[0047] When the reed clip 1 is opened, the diameter of its proximal circumscribed circle is 4-6 mm larger than the diameter of the drill channel 10. Figure 2 The ratio of the bottom of the borehole to the borehole channel 10 is slightly exaggerated to make a clear distinction in the size of the bottom of the borehole. In reality, the bottom of the borehole is only slightly larger than the borehole channel 10.

[0048] Accordingly, this embodiment also proposes a borehole imaging detector method, using the borehole imaging detector probe imaging protection device described in this embodiment, including the following steps:

[0049] Step 1: Keep probe 7 closed, cover the front end of probe 7 with protective cover 14, and retract the spring clip 1 by hand to put the spring clip 1 into the first working state. Then, insert the retracted spring clip 1 into the drill hole, and then push the protective cover 14 and probe 7 to the bottom of the drill hole along the drill hole channel 10 through the section-by-section extension push rod 8.

[0050] When the spring-loaded chuck 1 is advanced simply from the outside to the inside or from shallow to deep within the borehole, due to the limitation of the diameter of the borehole channel 10 itself and the elasticity of the spring-loaded chuck 1, the spring-loaded chuck 1 is always tightly attached to the inner wall of the borehole channel 10.

[0051] Step 2: Upon reaching the bottom of the borehole, the spring-loaded retaining leg 1 automatically opens due to its own elasticity, allowing it to enter its second working state. The free end of the opened spring-loaded retaining leg 1 rests against the borehole wall at the bottom of the borehole, forming a... Figure 2 The structure shown; at this time, even if an external force is used to pull outwards the spring clip 1 and the protective cover 14, they cannot be pulled out, because the spring clip 1 is already stuck in the bottom hole wall of the drill hole;

[0052] Step 3: Start probe 7 and gradually pull push rod 8 from the inside out. As push rod 8 is pulled back, probe 7 gradually moves away from protective cover 14 and begins imaging detection from the inside out.

[0053] Traditional detection methods involve probing from the outside in and from shallow to deep. Because the probe 7 is at the very front, it is easily covered by mud, coal dust, or water stains as it moves forward, leading to blurred or completely invisible images, or even lens damage. This invention replaces this method with a protective cover 14. The probe 7 is placed without detection from the outside in and from shallow to deep. Detection is only activated after the probe 7 reaches the bottom of the hole or a designated position. The detection process is changed to a pull-out detection method from the inside out and from deep to shallow, avoiding the probe 7 being at the front in the direction of travel and helping to keep the probe 7 surface clean.

[0054] This invention eliminates the need for repeated removal and cleaning of the probe 7 during borehole imaging detection, ensuring the continuity of the probe 7's imaging operation and improving observation accuracy and effectiveness. Furthermore, this invention simply adds a basic protective cover 14 to the original probe 7 without modifying the original imager probe 7, saving costs and simplifying operation. It is also applicable to most probes 7 and detection scenarios on the market, showing promising future application prospects.

[0055] In a specific example, the spring clip 1 and the protective cover 14 are generally made of metal. The total length of the spring clip 1 and the protective cover 14 is generally 150-200mm, which can be adjusted according to the specific size of the drilling imaging probe 7. The length of the protective cover 14 is generally 50-100mm, which can be adjusted according to the specific size of the camera probe 7. The inner diameter of the protective cover 14 is generally 2-3mm larger than the outer diameter of the camera probe 7. When making the protective cover 14 and the spring clip 1 of the present invention, a 180mm long hollow metal tube can be taken, one end of which is closed by a circular steel sheet. Another slightly smaller tube is welded to the center of the inner side of the circular steel sheet, and then a soft pad 6 is placed on it, thus completing the production of the small sleeve 5 and the closure of the far end of the protective cover 14. Alternatively, the far end of the hollow tube can be directly closed and a soft pad can be placed on it, directly using a part of the hollow tube as the small sleeve 5. A hollow circular tube is cut into eight equal parts along its axial direction from the open end. The cut width is 2-3 mm, and the cut length is 100 mm. The cut part of the hollow circular tube serves as the spring clip 1, and the uncut part serves as the spring sleeve 2, with a length of 80 mm. The cut hollow circular tube wall is then stretched outwards. The maximum circular diameter formed by the stretched tube wall should ideally be 4-6 mm larger than the borehole diameter. Based on existing research and actual exploration, taking an anchor bolt hole with a borehole diameter of Φ32 mm as an example, a suitable anchor bolt diameter should be Φ22-26 mm. Therefore, the maximum circular diameter formed by the stretched tube wall should be controlled between 36-38 mm.

[0056] like Figures 6 to 9As shown, Figure 6 , Figure 8 This is a detection image taken using a traditional push-type detection method. Figure 7 , Figure 9 This is an image of the borehole imaging device using the pull-type detection method of the present invention. It is clearly shown in the image that when using a traditional imager to advance and image simultaneously, if there is mud in the borehole channel 10, the advancing imager will collide with the mud, causing the imager's probe 7 to become contaminated with mud or water. Once the probe 7 lens is contaminated with mud or water, detection cannot continue; the probe 7 must be removed, cleaned, and then reinserted into the borehole, which is time-consuming and laborious. In the present invention, imaging occurs during the pull-back phase, with the probe 7 at the end of the non-advancing direction, thus avoiding collisions with mud. This helps maintain the integrity of the probe 7's field of view, resulting in a better image. It not only avoids the inconvenience of repeatedly removing and cleaning the probe 7 during detection but also ensures the continuity of the probe 7's imaging use, improving observation accuracy and effectiveness. In other words, the borehole imaging device of the present invention not only provides physical protection by covering the probe 7 but also ensures complete and effective imaging, effectively "protecting" the imaging process.

[0057] Example 2

[0058] This embodiment is another implementation based on embodiment 1. The description of the same technical solutions as in embodiment 1 will be omitted, and only the technical solutions that are different from those in embodiment 1 will be described.

[0059] In this embodiment, the protective cover 14 has a double-layer structure. The inner layer can slide relative to the outer layer. The spring clip 1 is fixed on the inner layer. The spring clip 1 can be retracted and released by moving the position of the inner layer.

[0060] like Figures 3 to 5 As shown, a borehole imaging probe protection device includes a protective cover 14 for covering the probe 7 when pushed inside the borehole. The protective cover 14 includes an outer sleeve 4 and a spring sleeve 2 slidably disposed within the outer sleeve 4. A small sleeve 5 is provided at the distal end of the outer sleeve 4, and the distal end of the small sleeve 5 is closed, allowing the probe 7 to be inserted into the small sleeve 5. The proximal end of the protective cover 14 is provided with a cover opening for the probe 7 to enter. A push rod 3 is fixed at the distal end of the spring sleeve 2. The outer sleeve 4 is provided with a through hole at its distal end corresponding to the position of the top rod 3, located outside the small sleeve 5. The top rod 3 passes through the through hole and exits the outer sleeve 4. The total length of the top rod 3 and the spring sleeve 2 is greater than the length of the outer sleeve 4. A plurality of spring clips 1 are uniformly fixed circumferentially at the proximal end of the spring sleeve 2. The proximal end of the spring clip 1 is a free end. The spring clip 1 has a first working state of being retracted inside the outer sleeve 4 and a second working state of being extended outside the outer sleeve 4.

[0061] When the spring clip 1 is in the first working state, the spring sleeve 2 is close to the far end of the outer sleeve 4, and all the spring clips 1 are at least partially retracted inside the outer sleeve 4. The diameter of the circumscribed circle of the proximal end of all the spring clips 1 is smaller than the diameter of the drilling channel 10, so that the spring clips 1 can be pushed along the drilling channel 10 towards the bottom of the borehole. When the spring clip 1 is in the second working state, the spring sleeve 2 approaches the proximal end of the outer sleeve 4, and the spring clips 1 extend at least partially out of the outer sleeve 4. The diameter of the circumscribed circle of the proximal end of all the spring clips 1 is larger than the diameter of the drilling channel 10, so that the spring clips 1 cannot disengage from the bottom of the borehole.

[0062] Furthermore, the number of top rods 3 is 2 to 3. Since the top rods 3 need to slide relative to the perforation, they are generally made of smooth steel bars to ensure their strength and flexibility. When there are two top rods 3, they can be arranged vertically, horizontally, or obliquely in a centrally symmetrical manner. The function of the top rods 3 is to push against the surrounding rock at the bottom of the borehole after being pushed to the bottom of the borehole, thus providing a reaction force. At the same time, it is necessary to ensure that the perforation position on the far end face of the outer sleeve 4 is as high as possible to prevent water from seeping into the outer sleeve 4 through the gap between the perforation and the top rods 3 when there is a lot of water accumulation in the borehole channel 10. In addition, a conical cover can be added to the far end of all the top rods 3 to increase the contact area with the surrounding rock. The circular base area of ​​the conical cover should not be larger than the outer contour of the outer sleeve 4. If the device encounters protruding obstacles such as steel bars or rocks during the advancement of the borehole channel device, the conical cover can also play a guiding role, causing the protective cover to advance eccentrically to avoid these obstacles and reduce the forward resistance. The free end of the reed clamp leg 1 can be spread out in the opposite direction to the central axis of the reed sleeve when unrestrained; therefore, the reed clamp leg 1 must first be retracted into the outer sleeve 4 before the probe 7 is inserted into the drill channel 10; the push rod 3 is designed to push out the reed clamp leg 1. First, the push rod 3 is pulled out to its longest length outside the drill hole to retract the reed clamp leg 1 and enter the hole. Figure 3 The first working state shown in the diagram above; after reaching the bottom of the hole, since the push rod 3 can no longer advance, when the push rod 8 continues to push, it can only continue to push the outer sleeve 4 towards the bottom of the borehole through the small sleeve 5. That is, the outer sleeve 4 continues to move forward, and the part of the push rod 3 that enters the outer sleeve 4 increases, so that the spring clip 1 located at the far end can be exposed from the outer sleeve 4. Figure 3 The transition state of the middle diagram enters Figure 3 In the second working state shown in the figure below, the reed leg 1 opens by its own elastic force.

[0063] Furthermore, such as Figure 3As shown, when the spring sleeve 2 moves to the far end of the outer sleeve 4 to the maximum extent, the free end of the spring clip 1 rests on the inner wall of the proximal end of the outer sleeve 4; during the process of the spring sleeve 2 moving towards the proximal end of the outer sleeve 4, the free end of the spring clip 1 simultaneously slides towards the proximal end of the outer sleeve 4 until it extends out of the outer sleeve 4 and opens.

[0064] In one embodiment, the minimum inner diameter of the reed sleeve 2 is greater than the outer diameter of the small sleeve 5, so that in the first working state, when the push rod 3 is pulled out to the longest distance, the reed sleeve 2 can abut against the far end face of the outer sleeve 4, which can make the outer sleeve 4 as short as possible and reduce the cost of raw materials for the product.

[0065] In one embodiment, the minimum inner diameter of the reed sleeve 2 is smaller than the outer diameter of the small sleeve 5, so that the small sleeve 5 cannot enter the reed sleeve 2; when the reed sleeve 2 abuts against the small sleeve 5, the free end of the reed clamp leg 1 is accommodated in the outer sleeve 4; specifically, as shown... Figure 3 As shown in the upper and lower figures, this can be achieved by providing a second protrusion 13 on the inner side of the far end of the reed sleeve 2; since the inner diameter of the outer sleeve 4 is consistent, the reed clamp leg 1 housed in the outer sleeve 4 can extend and open from the proximal end of the outer sleeve 4 without obstruction when the reed sleeve 2 moves toward the proximal end of the outer sleeve 4.

[0066] In another embodiment, such as Figure 3 , Figure 5 As shown, the proximal inner diameter of the outer sleeve 4 is smaller than the distal inner diameter of the outer sleeve 4, and the proximal inner diameter of the spring sleeve 2 is smaller than the distal inner diameter of the outer sleeve 4. Furthermore, the distal inner diameter of the spring sleeve 2 is larger than the proximal inner diameter of the outer sleeve 4. This arrangement is intended to prevent the spring sleeve 2 from detaching from the outer sleeve 4 during normal handling or installation. Specifically, as... Figure 3 As shown, a retaining ring 11 is fixed to the inner wall of the proximal end of the outer sleeve 4, and a first protrusion 12 is provided on the outer wall of the distal end of the spring sleeve 2. When the small sleeve 5 moves to the proximal end of the outer sleeve 4, the first protrusion 12 abuts against the retaining ring 11, so that the spring sleeve 2 can be caught by the retaining ring 11 of the outer sleeve 4, and the spring sleeve 2 cannot come out of the outer sleeve 4. The thickness of the retaining ring 11 and the first protrusion 12 can be the same as the wall thickness of the outer sleeve, which is generally 2-3 mm. Therefore, the radial thickness of the first protrusion 12 and the retaining ring 11 is 2-3 mm. Due to the influence of the retaining ring 11, special attention should be paid to ensuring that when the spring sleeve 2 moves to the distal end of the outer sleeve 4 to the maximum extent, the free end of the spring clip 1 should rest on the inner wall of the retaining ring 11.

[0067] Accordingly, this embodiment also proposes a borehole imaging detector method, using the borehole imaging detector probe imaging protection device described in this embodiment, including the following steps:

[0068] Step 1: Keep probe 7 closed, cover the front end of probe 7 with small sleeve 5, stretch push rod 3 to its longest length or push spring sleeve 2 into the depth of outer sleeve 4, so that spring clip leg 1 enters the first working state, and push protective cover 14 and probe 7 to the bottom of drill hole along drill hole channel 10.

[0069] Step 2: After reaching the bottom of the borehole, the push rod 3 is unable to advance further as it rests against the borehole wall. However, the probe 7, small sleeve 5, and outer sleeve 4 can only continue to advance under the pushing action of the push rod 8, causing the spring clip 1 to extend from the rear end of the outer sleeve 4. The spring clip 1 opens up by its own elasticity, putting the spring clip 1 into the second working state. The free end of the spring clip 1 is open and supported on the borehole wall at the bottom of the borehole. At this time, even if an external force tries to pull the spring clip 1 and the protective cover 14 outward, they cannot be pulled.

[0070] Step 3: Activate probe 7 and gradually pull push rod 8 from the inside out. Probe 7 gradually moves away from protective cover 14 and begins imaging detection from the inside out.

[0071] During the advance within the borehole channel 10, the reed clamp leg 1 is completely retracted into the outer sleeve 4, thereby preventing the reed clamp leg 1 from contacting the borehole wall of the borehole channel 10 and avoiding any impact of the reed clamp leg 1 on the borehole wall of the borehole channel 10. This makes the device and method in this embodiment more suitable for borehole imaging detection in soft and fractured rock masses.

[0072] This invention modifies the original detection process of pushing the probe 7 from the outside in and from shallow to deep by changing it to a process of pulling the probe 7 from the inside out and from deep to shallow after the probe 7 reaches the bottom of the hole or a designated position. The probe imaging protection device of this invention can adapt to borehole imaging detection in soft and fractured rock masses, and solves the technical problems of unclear imaging, inaccurate detection, and discontinuous detection process and low efficiency caused by repeated cleaning of the probe 7 in traditional borehole imaging detection in this geological environment. The device and method of this invention are convenient and quick, improving work efficiency, observation accuracy, and usage effect, and can provide better technical support for effectively controlling the deformation of rheologically fractured surrounding rock masses.

[0073] In a specific example, the spring clip 1, spring sleeve 2, outer sleeve 4, and push rod 3 are generally made of metal. The spring sleeve 2 (including push rod 3), outer sleeve 4, and small sleeve 5 are all made of metal. The total length L1 of the spring clip 1 and spring sleeve 2 (excluding push rod 3) is generally 100-200mm (which can be adjusted according to the length of the camera probe 7 and the size of the drill hole); the length L3 of the spring sleeve 2 is generally 30-50mm (which can be adjusted according to the spring length L2); the length L4 of the push rod 3 is generally 100-200mm (which complements the length L5 of the outer sleeve 4, i.e., the longer the outer sleeve 4, the longer the push rod 3; the shorter the outer sleeve 4, the shorter the push rod 3; this is mainly adjusted according to the size of the drill hole and the length of the spring); the length L6 of the small sleeve 5 is generally 50-100mm (which can be adjusted according to the length of the camera probe 7). Figure 3 , Figure 5 To make the various components more distinct, the gaps and pipe walls are exaggerated in the drawing. In reality, if the outer diameters of the small sleeve 5, the spring sleeve 2, and the outer sleeve 4 are D1, D2, and D3 respectively, then D1 is generally 2-3 mm larger than the outer diameter of the camera probe 7, D2 is generally 5-6 mm larger than D1, and D3 is generally 5-6 mm larger than D2. The hollow circular tube wall thickness of all sleeves is 2-3 mm. Therefore, the gap between the small sleeve 5 and the outer sleeve 4 is only slightly more than 3 mm, and the spring sleeve 2 can fit over the small sleeve 5. This allows the device to be as short and thin as possible, achieving the goal of using the least amount of raw materials to complete the protective cover production and reducing the cost of the protective device for one-time use.

[0074] When manufacturing the umbrella-shaped spring sleeve 2 of the present invention, a hollow metal tube with a total length of 100-200mm (which can be adjusted according to the length of the camera probe 7 and the size of the drill hole) and an outer edge at one end (i.e., T-shaped, which can be integrally formed or welded, with an outer edge of 1 round tube wall thickness) and open ends can be taken. Then, the hollow metal tube is cut into eight equal parts along the axial direction of the tube, starting from the end without the outer edge. The cut width is 2-3mm, and the last 30-50mm of length is left uncut (the uncut part is the spring sleeve 2). Then, the cut round tube wall is spread outward. The maximum circular diameter D4 formed by the spread round tube wall should be 4-6mm larger than the drill hole diameter (which can be adjusted according to the actual drill hole size). Finally, two steel bars with a length of 100-200mm (complementing the length L5 of the outer sleeve 4, i.e., the outer sleeve 4 is longer than the top rod 3, and the outer sleeve 4 is shorter than the top rod 3, mainly adjusted according to the borehole diameter and spring length requirements) and a diameter of 3-25mm are symmetrically welded onto the cross-section of the spring sleeve 2 as the top rod 3. Based on existing research results and actual detection, taking an anchor bolt hole with a borehole diameter of Φ32mm as an example, the more suitable anchor bolt (cable) diameter should be Φ22-26mm. Therefore, D4 ​​should be controlled between 36-38mm.

[0075] When manufacturing the outer sleeve 4 and the small sleeve 5 of this invention, a large-diameter spring sleeve 2 with a diameter of 5-6 mm and a total length of 100-200 mm (which can be adjusted according to the length of the camera probe 7 and the size of the drill hole) and an open-ended hollow metal tube with an inner edge at one end (which can be integrally formed or welded, with the inner edge having the wall thickness of a circular tube and the inner edge being equal to the aforementioned retaining ring 11) can be taken. Then, a circular steel sheet with the same diameter and thickness as the outer sleeve 4 can be taken. A 50-100mm (adjustable according to the length of the camera probe 7) hollow cylindrical tube with open ends is welded onto the steel sheet (or integrally formed, depending on cost considerations) as a small sleeve 5. A 4-6mm thick soft pad 6 is then placed inside the bottom of the closed tube. Holes are then drilled on the circular steel sheets on both sides of the small sleeve 5 according to the placement of the push rod 3. The push rod 3 is made of 3-5mm diameter steel bar, and the diameter of the drilled holes is 1-2mm larger than the diameter of the push rod 3, ranging from 4-7mm. After testing that the push rod 3 can freely pass through the holes, it is kept in place. The circular steel sheets are then welded onto the outer sleeve 4 to seal the bottom of the outer sleeve 4 (the bottom has two holes). The sleeve 4 is now complete.

[0076] It is understood that the above description is merely exemplary and the embodiments of this application are not intended to limit the scope of the invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A borehole imaging probe protection device, comprising a protective cover (14) for covering the probe (7) during drilling, characterized in that: The protective cover (14) includes an outer sleeve (4) and a spring sleeve (2) slidably disposed within the outer sleeve (4). A small sleeve (5) is provided at the distal end of the outer sleeve (4), and the distal end of the small sleeve (5) is closed, allowing the probe (7) to be inserted into the small sleeve (5). The proximal end of the protective cover (14) is provided with a cover opening for the probe (7) to enter. A top rod (3) is fixed at the distal end of the spring sleeve (2), and the top rod (3) is disposed within the small sleeve (5). Outside the sleeve (5), the push rod (3) extends out of the far end of the outer sleeve (4), and the total length of the push rod (3) and the spring sleeve (2) is greater than the length of the outer sleeve (4); a number of spring clips (1) are evenly fixed along the circumference at the proximal end of the spring sleeve (2), and the proximal end of the spring clips (1) is a free end; the spring clips (1) have a first working state of being folded inside the outer sleeve (4) and a second working state of being open outside the outer sleeve (4); When the spring clip (1) is in the first working state, the spring sleeve (2) is close to the far end of the outer sleeve (4), all the spring clips (1) are at least partially retracted into the outer sleeve (4), and the diameter of the circumscribed circle of the proximal end of all the spring clips (1) is smaller than the diameter of the drilling channel (10), so that the spring clips (1) can be pushed along the drilling channel (10) towards the bottom of the drilling hole; when the spring clip (1) is in the second working state, the spring sleeve (2) approaches the proximal end of the outer sleeve (4), and the spring clips (1) extend at least partially out of the outer sleeve (4), and the diameter of the circumscribed circle of the proximal end of all the spring clips (1) is larger than the diameter of the drilling channel (10), so that the spring clips (1) cannot detach from the bottom of the drilling hole; The function of the push rod (3) is to push the protective cover (14) and the probe (7) to the bottom of the borehole and then push them against the surrounding rock at the bottom of the borehole to provide a reaction force. Under the action of the reaction force, the outer sleeve (4) continues to move forward, and the part of the push rod (3) that enters the outer sleeve (4) grows, so that the spring clip (1) located at the far end can be exposed in the outer sleeve (4), and the spring clip (1) opens by its own elasticity. Then, as the push rod is pulled out, the probe (7) is pulled out from the protective cover (14) and begins to perform imaging detection from the inside out.

2. The borehole imaging probe imaging protection device according to claim 1, characterized in that: The number of reed clips (1) is 8 and they are all of equal length.

3. The borehole imaging probe imaging protection device according to claim 1, characterized in that: A soft pad (6) is provided at the distal end of the small sleeve (5).

4. The borehole imaging probe imaging protection device according to claim 1, characterized in that: After the reed clip (1) is opened, the diameter of its proximal circumscribed circle is 4-6 mm larger than the diameter of the drilling channel (10).

5. The borehole imaging probe imaging protection device according to claim 1, characterized in that: The minimum inner diameter of the spring sleeve (2) is smaller than the outer diameter of the small sleeve (5). When the spring sleeve (2) abuts against the small sleeve (5), the free end of the spring clip (1) is accommodated in the outer sleeve (4).

6. The borehole imaging probe imaging protection device according to claim 1, characterized in that: The number of top rods (3) is 2 to 3.

7. The borehole imaging probe imaging protection device according to claim 1, characterized in that: The inner diameter of the proximal end of the outer sleeve (4) is smaller than the inner diameter of the distal end of the outer sleeve (4), the inner diameter of the proximal end of the spring sleeve (2) is smaller than the inner diameter of the distal end of the outer sleeve (4), and the inner diameter of the distal end of the spring sleeve (2) is larger than the inner diameter of the proximal end of the outer sleeve (4) to prevent the spring sleeve (2) from falling out of the outer sleeve (4).

8. The borehole imaging probe imaging protection device according to claim 7, characterized in that: When the reed sleeve (2) moves to the far end of the outer sleeve (4) to the maximum extent, the free end of the reed clamp leg (1) rests on the inner wall of the proximal end of the outer sleeve (4).

9. A borehole imaging detection method, characterized in that... The method of using the borehole imaging probe imaging protection device as described in claim 1 includes the following steps: Step 1: Keep the probe (7) closed, cover the front end of the probe (7) with the protective cover (14), so that the spring clip leg (1) enters the first working state, and push the protective cover (14) and the probe (7) along the drilling channel (10) to the bottom of the drilling hole; Step 2: Put the spring clip (1) into the second working state, with the free end of the spring clip (1) open and supported on the hole wall at the bottom of the drill hole; Step 3: Start the probe (7), and gradually pull the push rod (8) from the inside out. The probe (7) gradually leaves the protective cover (14) and begins to perform imaging detection from the inside out.

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