Detecting instrument for drilling

Abstract

The utility model belongs to the field of mounting devices in mines, and particularly relates to a detecting instrument for drilling. In order to improve the shooting quality, the utility model provides a detector for drilling. The detector for drilling comprises a shell and a camera module installed at the front end of the shell, an air pump is installed in the shell and provided with an air inlet channel and an air outlet channel, the air inlet channel is used for being communicated with the outside to supply air to the air pump, and an air outlet of the air outlet channel faces a lens of the camera module. And the air outlet is used for blowing dust on the lens by the air blown out of the air outlet. The tidiness of the lens is ensured by pneumatically cleaning the lens, so that the shooting quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the installation device field in mine, especially, a kind of drilling detector. BACKGROUND

[0002] Currently, a novel and efficient means is rising in the field of coal mine emergency drilling rescue and fire observation management, which is: using special detection equipment to detect image information, temperature field and gas type in the borehole. At the same time, this means can also be used to detect image information, temperature field and gas type in the coal mine goaf.

[0003] For example, a Chinese invention patent with the authorization announcement number CN116242958B and the authorization announcement date of 2024.08.02 discloses a coal mine underground fire area detection device and its use method. The detection device includes a camera (equivalent to a camera module), a data processor (specifically a single-chip microcomputer), an infrared sensor, a gas sensor and a round rod (equivalent to a shell). The camera is installed at one end of the round rod. The infrared sensor and the gas sensor are installed on the outer surface of the round rod. The data processor is installed inside the round rod, and the data processor can transmit data to the upper computer.

[0004] In use, the detection device is sent into the borehole, and the detection device performs a photographing, temperature measurement and gas detection work every 1 m of deepening, and transmits the measured data to the data processor. The data processor transmits the data to the upper computer.

[0005] Although the above-mentioned detection device can detect the situation in the borehole, in the process of continuously extending the detection device into the borehole, on the one hand, the dust floating in the borehole will adhere to the lens of the camera, causing the lens to be dirty, thereby causing the captured image to be unclear or part of the image area to be blocked by dust, affecting the judgment of the specific situation in the borehole by the staff. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a drilling detector to solve the technical problem that dust will adhere to the lens in the process of continuously extending the existing detection device into the borehole, causing the captured image to be unclear or part of the image area to be blocked by dust.

[0007] To achieve the above-mentioned purpose, the technical scheme of the drilling detector provided by the utility model is:

[0008] A drilling detector includes a shell and a camera module installed at the front end of the shell. A gas pump is installed in the shell. The gas pump is configured with an air inlet channel and an air outlet channel. The air inlet channel is used to communicate with the outside to supply air to the gas pump. The air outlet of the air outlet channel faces the lens of the camera module to blow the dust on the lens with the gas blown out of the air outlet.

[0009] Further, a gas measuring module is installed in the shell, the gas measuring module comprises a to-be-measured air channel and a gas sensor, the gas sensor is used for measuring the gas in the to-be-measured air channel, and the to-be-measured air channel constitutes part of the air inlet channel.

[0010] Further, a lens protection cover for protecting the lens is installed at the front end of the shell, the lens protection cover comprises a transparent cover body, the lens is located behind the transparent cover body, an air outlet hole is formed in the transparent cover body, the air outlet, the lens and the air outlet hole are arranged opposite to each other in the front-rear direction, and the air outlet hole is communicated with the air outlet channel.

[0011] Further, a horn hole extending along the axis in the front-rear direction and a jack hole extending along the axis in the front-rear direction are arranged on the shell, the jack hole is located directly behind the horn hole and is adjacent to the horn hole, the aperture of the horn hole gradually decreases from front to back, the front end opening of the horn hole is communicated with the air outlet hole, the lens is inserted into the horn hole through the jack hole and the rear end opening of the horn hole in sequence, the lens is sealingly connected with the jack hole, the horn hole is divided into a first part and a second part in the front-rear direction, the lens is located in the second part, and the rear end outlet of the first part constitutes the air outlet.

[0012] Further, the aperture of the air outlet hole is smaller than the aperture of the front end opening of the horn hole.

[0013] Further, an air inlet hole is further arranged on the transparent cover body, the air inlet hole constitutes part of the air inlet channel, and a filter is connected to the air inlet hole.

[0014] Further, a filter is connected to the inlet of the air inlet channel.

[0015] Further, a guide sleeve for guiding the movement of the shell along the wall of the drilling hole is sleeved on the front end of the shell, in the front-rear direction, the outer diameter of the middle part of the guide sleeve is larger than the outer diameters of the two ends of the guide sleeve, and the outer diameter of the guide sleeve gradually decreases from the middle part to the two ends, so as to form a forward guide slope and a backward guide slope on the guide sleeve.

[0016] Further, the guide sleeve comprises a sleeve body and a plurality of rolling balls arranged on the outer circumferential surface of the sleeve body, and a part of the rolling balls protrude from the sleeve body to contact the wall of the drilling hole.

[0017] Further, an avoiding groove extending in the front-rear direction is further formed in the guide sleeve, and the avoiding groove is used for avoiding the protrusions on the wall of the drilling hole.

[0018] The drilling probe has the following beneficial effects: the drilling probe is an improved invention. The main difference between the drilling probe and the prior art is that, in the prior art, dust is easy to adhere to the lens, which causes the lens to be dirty and affects the shooting quality, while in the drilling probe, the lens is cleaned by using a gas pump, so that the cleanliness of the lens is ensured and the shooting quality is improved.

[0019] In actual use, after the borehole detector is sent into the borehole, if the camera module is in a video recording state, the air pump continuously works to continuously clean dust on the lens, if the camera module is in a photographing state, the air pump can continuously work to continuously clean the lens, or the air pump works for a set time before each photographing to clean the lens before photographing (i.e. intermittently clean the lens). BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a use state diagram of the borehole detector of the utility model;

[0021] Figure 2 is a structural schematic diagram of the borehole detector of the utility model;

[0022] Figure 3 is a structural schematic diagram of a cable gland in Figure 2

[0023] Figure 4 is a structural schematic diagram of an air inlet channel of the borehole detector of the utility model;

[0024] Figure 5 is a structural schematic diagram of an air outlet channel of the borehole detector of the utility model;

[0025] Figure 6 is a structural schematic diagram of a guide sleeve of the borehole detector of the utility model.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 100, borehole detector; 200, borehole; 300, cable; 400, push rod; 500, cable reel; 600, upper computer; 1-1, first shell; 1-2, second shell; 1-3, loudspeaker hole; 2, guide sleeve; 2-1, forward guide slope; 2-2, backward guide slope; 2-3, avoiding groove; 2-4, ball bearing; 3, lens protection cover; 3-1, air outlet hole; 4, infrared thermal imaging module; 5, light supplementing lamp; 6, camera module; 7, gas measuring module; 7-1, to-be-measured gas channel; 8, air pump; 9, control circuit board; 10, signal conversion module; 11, battery module; 12, compression lock nut; 13, lifting lug; 14, rear protective cover; 14-1, push rod threaded hole; 15, display screen; 16, filter. DETAILED DESCRIPTION

[0028] To solve the problems in the background art, the core inventive concept of the utility model is: air cleaning of the lens to ensure the neatness of the lens.

[0029] The utility model will be further described in detail in combination with the embodiments below. ​

[0030] The specific embodiment of the drilling detector provided by the utility model:

[0031] As Figure 1 shown, when detecting by the drilling detector 100, the push rod 400 can be used to push the drilling detector 100 to move along the drill hole 200, the drilling detector 100 is used to detect the condition in the drill hole 200, and corresponding data is transmitted to the upper computer 600 through the cable 300. Among them, since the depth of the drill hole 200 is generally tens of meters to hundreds of meters, the cable 300 is provided with the cable reel 500, so as to facilitate the arrangement of the cable 300 on the site.

[0032] When the drill hole 200 extends vertically, the drilling detector 100 can also be suspended by the crane and the rope, and the drilling detector 100 is slowly lowered by the crane to detect the condition in the drill hole 200.

[0033] As Figures 1-6 shown, the drilling detector 100 comprises a shell and a camera module 6 installed at the front end of the shell, an air pump 8 is installed in the shell, the air pump 8 is provided with an air inlet channel and an air outlet channel, the air inlet channel is used to communicate with the outside to supply air for the air pump 8, and the air outlet of the air outlet channel faces the lens of the camera module 6, so as to blow the dust on the lens by the gas blown out of the air outlet. Among them, the air outlet can be located at the side or front of the lens, as long as the gas can take away the dust on the lens.

[0034] In Figures 2-6 the specific embodiment shown, in order to facilitate the assembly of the drilling detector 100, the shell comprises a first shell 1-1 and a second shell 1-2 arranged in two parts, the front end of the first shell 1-1 is provided with external threads, the rear end of the second shell 1-2 is provided with internal threads, and the first shell 1-1 is threadedly connected with the second shell 1-2; the camera module 6 is prior art, the camera module 6 can only have a photographing function, only have a video recording function, or have both photographing and video recording functions, which will not be described here.

[0035] It needs to be specially pointed out that the front and rear directions of the drilling detector 100 itself do not represent the front and rear directions of the drilling detector 100 when it is used, for example, when the drill hole 200 extends vertically, in use, the front end of the drilling detector 100 enters the drill hole 200 first, then the whole drilling detector 100 moves downward, at this time, the front end of the drilling detector 100 is actually located directly below the rear end of the drilling detector 100.

[0036] The main difference between the utility model and the prior art is that: in the prior art, dust (such as coal ash) is easy to adhere to the lens, causing the lens to become dirty, affecting the shooting quality, and in the utility model, the lens is cleaned by air pump 8, thereby ensuring the cleanliness of the lens and improving the shooting quality.

[0037] In actual use, after the drilling detector 100 is sent into the borehole 200, if the camera module 6 is in the video recording state, the air pump 8 works continuously to continuously clean the dust on the lens, if the camera module 6 is in the photographing state, the air pump 8 can work continuously to continuously clean the lens, or the air pump 8 works for a set time before each photographing to clean the lens before photographing (i.e. intermittently cleaning the lens).

[0038] As shown in Figures 1-5 As a preferred embodiment, a gas measurement module 7 is also installed in the shell, the gas measurement module 7 includes a to-be-measured air channel 7-1 and a gas sensor (specifically a laser sensor), the gas sensor is used to measure the gas in the to-be-measured air channel 7-1, the to-be-measured air channel 7-1 constitutes part of the air inlet channel, the shell is provided with an air inlet hole constituting part of the air inlet channel, and a connecting pipe is connected between the air inlet hole and the to-be-measured air channel 7-1, the connecting pipe is a reinforced plastic pipe.

[0039] The gas measurement module 7 is an existing product purchased as a whole, and will not be described here. The utility model has the advantage of using such a gas measurement module 7: the to-be-measured air channel 7-1 simultaneously serves as part of the air inlet channel, the gas entering the air inlet channel simultaneously serves the purpose of being measured and the purpose of cleaning the lens, and the structure is simple.

[0040] In other embodiments, referring to the Chinese invention patent with the authorization announcement number CN116242958B, a laser sensor for detecting gas composition can also be installed on the outer circumferential surface of the shell. At this time, the shell is provided with an air inlet hole and an air outlet hole connected with the air pump 8, and the air inlet hole and the air outlet hole are connected with the air pump through connecting pipes to constitute an air inlet channel and an air outlet channel.

[0041] As a preferred embodiment, a filter 16 is connected at the inlet of the air inlet channel to prevent dust from entering the air inlet channel. At this time, on the one hand, the to-be-measured air channel 7-1 does not include dust, and the measurement accuracy of the laser sensor is higher, and on the other hand, the gas blown out from the air outlet does not carry dust, which is conducive to better cleaning of the lens.

[0042] In some complex working conditions, there are solid particles (such as coal cinder) entrained by gas and moving with the gas in the borehole 200. In order to avoid the solid particles from impacting on the lens, the borehole detector 100 can be applied to the above-mentioned complex working conditions. As a preferred embodiment, the front end of the shell is provided with a lens protection cover 3 for protecting the lens. The lens protection cover 3 comprises a transparent cover body, the lens is located behind the transparent cover body, and an exhaust hole 3-1 is formed in the transparent cover body. The exhaust port, the lens and the exhaust hole 3-1 are arranged in the front-rear direction, and the exhaust hole is communicated with the exhaust channel.

[0043] In the embodiment, the lens protection cover 3 comprises a frame and a transparent acrylic round plate (i.e. the transparent cover body) which is adhered to the frame by silica gel. The frame is provided with external threads, and the second shell 1-2 is provided with corresponding internal threads. The frame is threadedly connected with the second shell 1-2.

[0044] In actual use, the lens protection cover 3 can effectively avoid the solid particles from impacting on the lens, and the transparent cover body does not block the light, which is beneficial to the camera module 6 to shoot the situation in the borehole 200. When the air pump 8 is working normally, the gas is swept away from the lens, and then is discharged forward through the exhaust hole and the exhaust hole 3-1, so that the solid particles moving towards the exhaust hole 3-1 turn around, thereby avoiding the solid particles from impacting on the lens through the exhaust hole 3-1 and the exhaust hole. At the same time, in the technical solution in which the exhaust hole 3-1 is not arranged on the lens protection cover 3, dust will be attached to the lens protection cover 3, which affects the shooting quality. At this time, the behavior of cleaning the lens loses its significance. In the technical solution in which the exhaust hole 3-1 is arranged on the lens protection cover 3, dust cannot be attached to the exhaust hole 3-1, and the lens is cleaned by air, so that the shooting quality can be ensured to be good.

[0045] In other embodiments, the borehole detector 100 can not comprise the lens protection cover 3. At this time, the borehole detector 100 is applicable to the working condition in which the geological condition is good, and only dust such as coal ash exists in the borehole 200, and no solid particles such as coal cinder exist.

[0046] As a preferred embodiment, the shell is provided with a horn hole 1-3 extending along the axis in the front-rear direction and a jack hole extending along the axis in the front-rear direction. The jack hole is located directly behind the horn hole 1-3 and is adjacent to the horn hole 1-3. The aperture of the horn hole 1-3 gradually decreases from front to back. The front end opening of the horn hole 1-3 is communicated with the exhaust hole 3-1. The lens is inserted into the horn hole 1-3 through the jack hole and the rear end opening of the horn hole 1-3 in sequence, and the lens is sealingly connected with the jack hole through a sealing ring. The horn hole 1-3 is divided into a first part and a second part in the front-rear direction. The lens is located in the second part. The rear end outlet of the first part constitutes the exhaust port, so that the shooting module has a larger shooting wide angle.

[0047] In other specific embodiments, the front end of the lens is located in the insertion hole, and the rear end opening of the horn hole 1-3 constitutes the air outlet.

[0048] As a preferred specific embodiment, the aperture of the exhaust hole 3-1 is smaller than the aperture of the front end opening of the horn hole 1-3, which can on the one hand improve the flow rate of the gas discharged from the exhaust hole 3-1, and better avoid solid particles from entering the exhaust hole 3-1, and on the other hand, can better avoid the gas from being directly discharged from the exhaust hole 3-1, and improve the flow rate of the gas used for cleaning the lens and the proportion of this part of the gas in all the gas.

[0049] In other specific embodiments, the aperture of the exhaust hole 3-1 can also be the same as the aperture of the front end opening of the horn hole 1-3.

[0050] As a preferred specific embodiment, the transparent cover is also provided with an air inlet hole, which constitutes part of the air inlet channel, and the air inlet hole constitutes the entrance of the air inlet channel, and the filter 16 is connected at the air inlet hole, which has a simple structure and is convenient for gas sampling from the front end of the drilling detector 100, minimizes the impact of negative pressure on the drilling hole wall during gas sampling, and maximizes the avoidance of solid particles such as coal residue from the drilling hole wall. The filter 16 can be installed at the air inlet hole by adhesion or other methods, and the filter core of the filter 16 is a filter cotton or other filter core for filtering dust. When the filter core is dirty, the filter core needs to be replaced. The specific structure of the filter 16 is a prior art, which will not be described here.

[0051] In other specific embodiments, the air inlet hole can also be directly provided on the side surface of the shell.

[0052] Since the drilling hole wall is rough and there are some protrusions on the drilling hole wall, in order to make the drilling detector 100 move better in the drilling hole 200, as a preferred specific embodiment, the front end of the shell is sleeved with a guide sleeve 2 for guiding movement cooperation with the drilling hole wall. In the front-rear direction, the outer diameter of the middle of the guide sleeve 2 is greater than the outer diameter of both ends of the guide sleeve 2, and the outer diameter of the guide sleeve 2 gradually decreases from the middle to both ends, so as to form a forward guide slope 2-1 and a backward guide slope 2-2 on the guide sleeve 2. Through the guide slope, the drilling detector 100 can move better in the drilling hole 200.

[0053] In other specific embodiments, referring to the Chinese invention patent with authorization announcement No. CN116242958B, the shell can also be a round rod, which has a large gap with the hole wall of the drilling hole 200 to ensure that the drilling detector 100 can move in the drilling hole 200.

[0054] As a preferred specific embodiment, the guide sleeve 2 comprises a sleeve body and balls 2-4 installed on the peripheral surface of the sleeve body, part of the balls 2-4 protruding from the sleeve body for contacting the borehole wall, which is conducive to reducing the friction between the guide sleeve 2 and the borehole wall.

[0055] In other specific embodiments, the guide sleeve 2 does not comprise balls 2-4, and the outer surface of the guide sleeve 2 is in sliding fit with the borehole wall.

[0056] As a preferred specific embodiment, the guide sleeve 2 is further provided with front and rear extending avoiding grooves 2-3 for avoiding the protrusions on the borehole wall. In use, whether the drilling detector 100 is rotated or not is selected according to the actual situation, and the avoiding grooves 2-3 are aligned with the protrusions on the borehole wall in the extension direction of the borehole 200, so that the drilling detector 100 moves better in the borehole 200.

[0057] In other specific embodiments, the guide sleeve 2 is made of elastic material, and when the guide sleeve 2 contacts the protrusions on the borehole wall, the force for driving the drilling detector 100 to move horizontally is increased, and the guide sleeve 2 deforms to ensure that the drilling detector 100 passes through the protrusions.

[0058] The following will be described in detail in combination with the accompanying drawings. Figures 1-6 The above-mentioned contents are described in detail.

[0059] As a preferred specific embodiment, the front end of the shell is further provided with an infrared thermal imaging module 4, the resolution of the infrared thermal imaging module 4 is 32*24, the temperature measurement range is -40~300 ℃, and the absolute temperature error is ±1.5 ℃, so as to detect the temperature field in the borehole 200.

[0060] When the gas measurement module 7 is further installed on the shell, the drilling detector 100 can simultaneously detect the image (or video), temperature field and gas parameters in the borehole 200, which improves the detection types and accuracy of the detection in the borehole 200, and provides accurate and scientific basis for geological detection, rescue drilling and fire area treatment.

[0061] In other specific embodiments, referring to the Chinese invention patent application with the application publication number CN108468563A and the application publication date of August 31, 2018, and the invention name of Mine Drilling Rescue Life Detection Method Based on Detector Combination, the image (or video), temperature field and gas parameters can be detected through three boreholes 200 respectively.

[0062] In Figures 1-6In the specific embodiment shown, the rear end of the shell is also connected with a rear cover 14, the rear end of the shell is provided with external threads, the rear cover 14 is provided with corresponding internal threads, and the shell is threadedly connected with the rear cover 14. The cable 300 is introduced into the shell through an existing compression nut type cable introduction structure, at this time, the compression lock nut 12 is installed on the rear cover 14 to ensure that external gas cannot enter between the shell and the rear cover 14.

[0063] At the same time, the rear end of the shell is provided with a display screen 15, and the staff can adjust the parameters of the drilling detector 100 through a remote controller, and the parameters are displayed on the display screen 15, so as to facilitate the staff to debug the drilling detector 100. The rear cover 14 is provided with a push rod threaded hole 14-1 and an ear 13, so as to facilitate the movement of the drilling detector 100 through the suspension of a crane or the pushing of a push rod 400.

[0064] Since the drilling hole 200 is relatively dark, the front end of the shell is also provided with a fill light 5, which can be a constant light or a flash light; the lens can be a fixed focus camera, and the specific parameters are color 0.001 lux and 2 million pixels; the cable 300 can be a polyethylene insulated braided shielding polyvinyl chloride sheath communication cable for coal mines.

[0065] As shown in Figure 2 The battery module 11, the signal conversion module 10, the control circuit board 9, the air pump 8, the gas measurement module 7, the camera module 6 and the infrared thermal imaging module 4 are connected through screws to form an internal structural framework, the front end of the internal structural framework is provided with external threads, the second shell 1-2 is provided with corresponding internal threads, and the internal structural framework is threadedly connected with the second shell 1-2; the rear end of the battery module 11 is provided with external threads, the first shell 1-1 is provided with corresponding internal threads, and the battery module 11 is threadedly connected with the first shell 1-1.

[0066] The battery module 11 can supply power to the entire device, and the battery module 11 includes a storage battery and corresponding charging and discharging structures, the signal conversion module 10 is electrically connected with the cable 300 and is used for converting signals, and the control circuit board 9 is used for controlling the working states of the air pump 8, the gas measurement module 7, the camera module 6, the infrared thermal imaging module 4 and the flash light.

[0067] As can be understood by those skilled in the art, at the threadedly connected positions of the rear cover 14, the first shell 1-1, the second shell 1-2 and the lens protection cover 3, a sealing ring can also be additionally provided to avoid gas leakage.

[0068] Finally, it needs to be explained that the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments without paying creative labor, or make equivalent replacement to part of the technical features, or organically combine different specific embodiments, so as to combine the specific embodiments given in the drawings, of course, those skilled in the art can also combine the specific embodiments not given in the drawings of the remaining specification. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A borehole probe comprising a housing and a camera module mounted at a front end of the housing, characterized in that, A gas pump is installed in the shell, the gas pump is provided with an air inlet channel and an air outlet channel, the air inlet channel is used for air communication with the outside world to supply air for the gas pump, and the air outlet of the air outlet channel faces the lens of the camera module to blow off dust on the lens.

2. The borehole probe of claim 1, wherein, A gas measurement module is also installed in the shell, the gas measurement module includes a to-be-measured air channel and a gas sensor, the gas sensor is used for measuring the gas in the to-be-measured air channel, and the to-be-measured air channel constitutes part of the air inlet channel.

3. The borehole probe of claim 1 or 2, wherein A lens protection cover for protecting the lens is installed at the front end of the shell, the lens protection cover includes a transparent cover body, the lens is located behind the transparent cover body, an exhaust hole is formed in the transparent cover body, the air outlet, the lens and the exhaust hole are arranged in the front-rear direction, and the exhaust hole is in communication with the air outlet channel.

4. The borehole probe of claim 3, wherein, The shell is provided with a horn hole extending along the axis in the front-rear direction and a jack extending along the axis in the front-rear direction, the jack is located directly behind the horn hole and is adjacent to the horn hole, the aperture of the horn hole gradually decreases from front to back, the front end opening of the horn hole is in communication with the exhaust hole, the lens is inserted into the horn hole through the jack and the rear end opening of the horn hole in sequence, and the lens is in sealing engagement with the jack, the horn hole is divided into a first part and a second part in the front-rear direction, the lens is located in the second part, and the rear end outlet of the first part constitutes the air outlet.

5. The borehole probe of claim 4, wherein, The aperture of the exhaust hole is smaller than the aperture of the front end opening of the horn hole.

6. The borehole probe of claim 3 wherein, The transparent cover body is also provided with an air inlet hole, the air inlet hole constitutes part of the air inlet channel, and a filter is connected to the air inlet hole.

7. The borehole probe of claims 1 or 2, wherein, A filter is connected to the inlet of the air inlet channel.

8. The borehole probe of claims 1 or 2, wherein, The front end of the shell is sleeved with a guide sleeve for guiding the movement of the drill hole wall, in the front-rear direction, the outer diameter of the middle of the guide sleeve is greater than the outer diameters of the two ends of the guide sleeve, and the outer diameter of the guide sleeve gradually decreases from the middle to the two ends to form a forward guide slope and a backward guide slope on the guide sleeve.

9. The borehole probe of claim 8 wherein, The guide sleeve includes a sleeve body and a plurality of balls installed on the outer circumferential surface of the sleeve body, and a part of the balls protrude from the sleeve body to contact the drill hole wall.

10. The borehole probe of claim 9, wherein, The guide sleeve is also provided with a front-rear extending avoiding groove for avoiding the protrusions on the drill hole wall.

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