Drilling television detection device for geophysical exploration

Abstract

The invention discloses a borehole television detection device for geophysical exploration, which comprises a television detector body and an auxiliary supporting mechanism, and is characterized in that the auxiliary supporting mechanism comprises three groups of auxiliary supporting units which are uniformly distributed and arranged on the outer wall of the television detector body in a surrounding manner; the auxiliary supporting unit comprises an elastic telescopic rod piece, a locking assembly, a pressure detection module and a control module. One side of the shell is connected with the outer wall of the television detector body; the sliding block is slidably connected into the shell. One end of the moving rod is fixedly connected with the side wall of the sliding block, and the other end extends to the outer side of the shell; the moving rod is sleeved with the spring, and the two ends of the spring are connected with the sliding block and the shell correspondingly; the locking assembly is connected between the shell and the sliding block, and the pressure detection module is arranged at the other end of the moving rod; according to the invention, through the arrangement of the three groups of auxiliary supporting units, it can be ensured that the television detector is located in the center in the obstacle crossing process, so that the problem of detection errors caused by eccentricity of the television detector is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of geological exploration, in particular to a borehole television detection device for geophysical exploration. Background Art

[0002] As a method of geophysical exploration, borehole television detection mainly uses a television detector composed of a high-definition camera or optical equipment to observe and record the inner wall of the borehole in real time. It is used to identify detection objects such as rock stratification, joints and fissures, fault fracture zones, etc.

[0003] When using borehole television detection, a support frame is usually set up above the borehole, and the television detector is connected by cables and slowly lowered into the borehole. The lowering process has requirements on the position of the television detector, which needs to be kept in the center of the borehole. If the television detector deviates from the center of the borehole, the distance between its camera or optical sensor and the borehole wall will be uneven, the near-side borehole wall will be magnified, and the far-side borehole wall will be compressed, causing the image to stretch or distort, making it difficult to accurately reflect the real cracks in the borehole wall, rock layer interfaces and other features. Using cables alone to lower the TV detector obviously cannot ensure that the detection process always remains centered and stable, making it difficult to accurately describe the fracture morphology in the hole.

[0004] In order to keep the TV detector vertical and centered when it descends, most borehole TV detection devices are usually equipped with auxiliary support structures around the TV detector. These auxiliary support structures are composed of three auxiliary support rods with an angle of 120 degrees between each other. The three auxiliary support rods can realize the centering structure to ensure that the TV detector is in the center during the descending detection process. However, in some areas with complex geological structures, such as fault zones and fold zones, broken rock layers or areas with developed fissures may be encountered during the drilling process. These areas are prone to rock crushing and displacement, thereby forming convex obstacles on the hole wall. In order to cross the convex obstacles, some current measures are to change the auxiliary support rods into elastic telescopic auxiliary support rods. Although the use of elastic telescopic auxiliary support rods can ensure good obstacle crossing performance, its centering support needs to rely on the three elastic telescopic auxiliary support rods to be in a force balance state. When one of the elastic telescopic auxiliary support rods contacts the convex obstacle, the force balance will be broken, making it difficult to keep the TV detector in the center during the obstacle crossing process, so there is a problem of difficulty in accurately detecting the crack morphology in the hole. Summary of the invention

[0005] The purpose of the present invention is to provide a borehole television detection device for geophysical exploration to solve the problem of detection error caused by the inability to ensure that the television detector itself is in a centered position during the detection process when the existing television detector encounters a protruding obstacle on the hole wall.

[0006] The technical solution of the present invention is: A borehole television detection device for geophysical exploration, comprising a television detector body and an auxiliary support mechanism, wherein the auxiliary support mechanism comprises three groups of auxiliary support units uniformly arranged around the outer wall of the television detector body, the auxiliary support unit comprises an elastic telescopic rod, a locking assembly, a pressure detection module and a control module, and the elastic telescopic rod comprises a shell, a slider, a moving rod and a spring; one side of the shell is connected to the outer wall of the television detector body; the slider is slidably connected to the inside of the shell; one end of the moving rod is fixedly connected to the side wall of the slider away from the television detector body, and the other end of the moving rod extends to the outside of the shell; The spring is sleeved on the moving rod, and the two ends of the spring are respectively connected to the slider and the shell; the locking assembly is connected between the shell and the slider, and is used to lock the slider in the position of the shell; the control module is respectively connected to the pressure detection module and the locking assembly, and the pressure detection module is arranged at the other end of the moving rod. The pressure detection module is used to detect the pressure value generated by the contact between the end of the moving rod and the wall of the drill hole. When the end of the moving rod contacts the protruding obstacle and generates a pressure change, the locking assembly is controlled by the control module to release the lock of the slider, so that the moving rod can elastically extend and retract to cross the protruding obstacle under the elastic action of the spring.

[0007] Preferably, as a further improvement of the present invention, the other end of the moving rod is connected to a roller via a bracket, and the pressure detection module is arranged in the circumference of the roller.

[0008] Preferably, as a further improvement of the present invention, the pressure detection module includes a plurality of pressure sensors, a plurality of mounting grooves are evenly distributed around the circumference of the roller, the plurality of pressure sensors are fixed in the plurality of mounting grooves in a one-to-one correspondence, and the plurality of pressure sensors are electrically connected to the control module respectively.

[0009] Preferably, as a further improvement of the present invention, the locking assembly includes an electromagnet and a first annular bag; the electromagnet is cylindrical, one end of the electromagnet is fixed to the inner wall of the shell, the electromagnet is electrically connected to the control module, a through hole is opened on the slider, and the electromagnet is inserted into the through hole; the first annular bag is sleeved on the outside of the electromagnet, and the end faces of the first annular bag are respectively connected to the slider and the inner wall of the shell, the first annular bag is filled with magnetorheological fluid, and the control module controls the electromagnet to turn on and off to change the magnetic field so that the magnetorheological fluid can achieve solid-liquid conversion, and when the magnetorheological fluid is in a solid state, it will produce abutment and limit the slider.

[0010] Preferably, as a further improvement of the present invention, the locking assembly includes a conductive rod and a second annular bag; one end of the conductive rod is fixed to the inner wall of the shell, the electromagnet is electrically connected to the control module, and the slider is provided with a through hole for the conductive rod to pass through; the second annular bag is sleeved on the outside of the conductive rod, and the end faces of the second annular bag are respectively connected to the slider and the inner wall of the shell, the second annular bag is filled with electrorheological fluid, and the control module controls the conductive rod to be powered on and off to change the electric field so that the electrorheological fluid can achieve solid-liquid conversion, and when the electrorheological fluid is in a solid state, it produces abutment limit with the slider.

[0011] Preferably, as a further improvement of the present invention, the through hole is arranged in the middle of the slider, and the moving rod and the spring are in two groups, which are symmetrically arranged on both sides of the slider with the center line of the through hole as the axis.

[0012] Preferably, as a further improvement of the present invention, a cover is provided on the top of the TV detector body, a connector for connecting to a cable is provided on the top of the cover, the upper end of the TV detector body is slidably connected to the inside of the cover, and the inner top surface of the cover and the top of the TV detector body are connected via a connecting assembly.

[0013] Preferably, as a further improvement of the present invention, a connecting ring is provided on the outer side of the TV detector body, three rotating sleeves are evenly rotatably connected to the connecting ring, the shells in the three groups of auxiliary support units are fixedly connected to the three rotating sleeves one by one through connecting rods, and a rotating mechanism is provided on the TV detector body, and the rotating mechanism is connected to the three rotating sleeves for synchronously driving the three rotating sleeves to rotate around the connecting ring to adjust the opening angles of the rollers in the three groups of auxiliary support units.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Three groups of auxiliary support units are used to replace the three elastic telescopic support rods for centering support. The locking components in the three groups of auxiliary support units can lock the position of the slider during the descending detection process, so that the three groups of auxiliary support units are all rigid support structures, and the length is guaranteed to be consistent. The pressure value of the contact between the end of the moving rod and the hole wall is detected in real time by the pressure detection module arranged at the end of the moving rod. When the hole wall is smooth and flat, the pressure change tends to be stable. When a certain auxiliary support unit encounters a raised obstacle on the wall of the drill hole, it is blocked by the raised obstacle, and the end of the moving rod in contact with it produces a large pressure change. At this time, the control module controls the locking component to release the locking state of the position of the slider in the current auxiliary support unit after detecting the pressure change, so that it can be elastically extended and retracted under the action of the spring to cross the raised obstacle. The remaining two groups of auxiliary support units still maintain their length unchanged due to the presence of the locking component during this process, and are in rigid contact with the hole wall, so that the TV detector can be ensured to be in a centered position during the obstacle crossing process, thereby reducing the detection error in the obstacle crossing process.

[0015] 2. When crossing obstacles, the spring can provide elastic support force to the moving rod, so that the end of the moving rod can adapt to raised obstacles of different shapes to cross the obstacles, and the moving rod is always kept in contact with the surface contour of the raised obstacle to sense the pressure change, thereby realizing the real-time detection process of the obstacle crossing position. Once the raised obstacle is completely crossed, the elastic telescopic support rod can be immediately controlled to be transformed into a rigid support, which has the excellent function of detecting smooth obstacle crossing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a borehole television detection device for geophysical exploration.

[0017] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of an auxiliary support unit in a borehole television detection device for geophysical exploration when it is not in contact with a raised obstacle.

[0018] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of an auxiliary support unit in a borehole television detection device for geophysical exploration when it contacts a raised obstacle.

[0019] Figure 4 The present invention is a schematic diagram of the main structure of a borehole television detection device for geophysical exploration.

[0020] Figure 5 The present invention is a schematic diagram of the top view of the structure of a borehole television detection device for geophysical exploration. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1To the attached Figure 5 , the specific implementation methods of the present invention are described in detail. In the description of the invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the invention, unless otherwise specified, "plurality" means two or more.

[0023] Example 1 like Figures 1 to 5 As shown, an embodiment of the present invention provides a borehole television detection device for geophysical exploration, including a television detector body 1 and an auxiliary support mechanism, the auxiliary support mechanism including three groups of auxiliary support units uniformly arranged around the outer wall of the television detector body 1, the auxiliary support unit elastic telescopic rod, a locking assembly, a pressure detection module and a control module, the elastic telescopic rod including a shell 31, a slider 32, a moving rod 33 and a spring 34; one side of the shell 31 is connected to the outer wall of the television detector body 1; the slider 32 is slidably connected to the inside of the shell 31; one end of the moving rod 33 is fixedly connected to the side wall of the slider 32 away from the television detector body 1, and the other end of the moving rod 33 extends to the outside of the shell 31; The spring 34 is sleeved on the moving rod 33, and the two ends of the spring 34 are respectively connected to the slider 32 and the shell 31; the locking assembly is connected between the shell 31 and the slider 32, and is used to lock the slider 32 in the position of the shell 31; the pressure detection module and the control module, the control module is respectively connected to the pressure detection module and the locking assembly, the pressure detection module is arranged at the other end of the moving rod 33, the pressure detection module is used to detect the pressure value generated by the contact between the end of the moving rod 33 and the wall of the drill hole, when the end of the moving rod 33 contacts the protruding obstacle and generates a pressure change, the locking assembly is controlled by the control module to release the lock of the slider 32, and the moving rod 33 can be elastically extended and retracted to cross the protruding obstacle under the elastic action of the spring 34.

[0024] In this embodiment, when detecting, the TV detector body 1 is connected to the cable, and a winch is used to lower it into the borehole for detection. Before detection, the auxiliary support mechanism needs to be adjusted. First, the lock of the locking assembly on the slider 32 is released. At this time, the spring 34 is in a free extension state. Then the TV detector body 1 is placed inside the borehole. Under the elastic force of the spring 34, the three groups of auxiliary support units are unfolded so that the ends of the moving rods 33 of the three groups of auxiliary support units are in contact with the wall of the borehole. Since the three groups of auxiliary support units are evenly distributed at 120° to each other, the centering function can be realized, so that the TV detector The main body 1 is located at the center of the borehole. When the spring 34 tends to be stable, the position of the slider 32 is locked by the locking component, so that the moving rod 33 maintains the current extension length, so that the auxiliary support unit as a whole constitutes a rod with a fixed length, and the moving rod 33 is kept in contact with the borehole wall in a stable posture. As the TV detector body 1 moves downward, the moving rod 33 contacts and moves with the smooth hole wall, and the pressure value changes tend to be stable. When the moving rod 33 contacts the protruding obstacle on the hole wall, a large fluctuation of pressure value will be generated. After detecting it, the control module will control the locking component connected to the current moving rod 33 to contact the locking function. Under the elastic action of the spring 34, the auxiliary support unit currently in contact with the protruding obstacle is transformed into an elastic telescopic structure with variable length, so that the moving rod 33 can be elastically telescopic and moved to cross the protruding obstacle. The other two auxiliary support units that are not in contact with the protruding obstacle still maintain their own length unchanged as a whole, providing rigid support, thereby ensuring that the TV detector body 1 is in the center position during the process of crossing the protruding obstacle, thereby avoiding the problem of offset affecting the detection effect. When the moving rod 33 passes the rear protruding obstacle and detects that the direct contact pressure between the moving rod 33 and the hole wall tends to be stable, the locking group is controlled again. The parts lock the position of the slider 32, so that the three groups of auxiliary support units each maintain a rigid state, so that the TV detector body 1 is always located at the center of the drill hole during the downward movement, maintaining a good detection environment, and the spring can provide elastic support force to the moving rod 33, so that the end of the moving rod 33 can adapt to raised obstacles of different shapes for overcoming the obstacles, and always keep the end of the moving rod 33 in contact with the surface contour of the raised obstacle to sense the pressure change, thereby realizing the real-time detection process of the obstacle overcoming position, and once the raised obstacle is completely crossed, the elastic telescopic support rod can be immediately controlled to become rigid.

[0025] Further, such as Figure 1 and Figure 2As shown, considering that there will be greater wear and the resistance encountered when the end of the moving rod 33 contacts the wall of the drill hole or the raised obstacle during movement, a roller 4 is connected to the other end of the moving rod 33 through a bracket 41, and a pressure detection module is arranged in the circumference of the roller 4. The roller 4 is used instead of the end of the moving rod 33 to contact the wall of the drill hole or the raised obstacle, which can reduce friction and wear problems.

[0026] Furthermore, if Figure 2 As shown, the pressure detection module includes a plurality of pressure sensors, a plurality of mounting grooves are evenly distributed around the roller 4, a plurality of pressure sensors are fixed in the plurality of mounting grooves in a one-to-one correspondence, and the plurality of pressure sensors are electrically connected to the control module respectively.

[0027] Example 2 Based on Example 1, this embodiment is an optional implementation scheme of the locking assembly. The specific structure of the locking assembly includes an electromagnet 51 and a first annular bag 52; the electromagnet 51 is cylindrical, one end of the electromagnet 51 is fixed to the inner wall of the shell 31, the electromagnet 51 is electrically connected to the control module, a through hole is opened on the slider 32, and the electromagnet 51 is inserted into the inside of the through hole; the first annular bag 52 is sleeved on the outside of the electromagnet 51, and the end faces of both ends of the first annular bag 52 are respectively connected to the slider 32 and the inner wall of the shell 31, and the first annular bag 52 is filled with magnetorheological fluid. The control module controls the electromagnet 51 to turn on and off to change the magnetic field so that the magnetorheological fluid can achieve solid-liquid conversion. When the magnetorheological fluid is in a solid state, it will produce abutment and limit position with the slider 32.

[0028] In this embodiment, the locking assembly uses the solid-liquid transition of the magnetorheological fluid to realize the limit locking function of the slider 32. During the normal movement process, the moving position of the slider 32 of the locking assembly needs to be limited. Figure 2 As shown, the control module controls the electromagnet 51 to be in a power-on state, so that the electromagnet 51 generates a magnetic field. Since the first annular bag 52 is sleeved on the electromagnet 51, it is affected by the magnetic field, so that the magnetorheological fluid inside the first annular bag 52 changes from a liquid state to a solid state, thereby abutting against the right end surface of the slider 32, limiting the movement position of the slider 32, and providing support force to the roller 4 during the contact and movement of the roller 4 with the borehole wall to ensure that the roller 4 contacts the borehole wall in a rigid form, so that the three groups of auxiliary support units maintain the centering function of the TV detector body 1. When encountering a raised obstacle, it is necessary to release the movement position limit of the slider 32 so that the roller 4 can elastically extend and retract to overcome the obstacle. Figure 3As shown, the electromagnet 51 is powered off by the control module. After the electromagnet 51 is powered off, it no longer generates a magnetic field, so that the magnetorheological fluid inside the first annular bag 52 changes from a solid state to a liquid state. The first annular bag 52 is converted into a flexible structure as a whole. At this time, it no longer generates a force against the right end face of the slider 32. Therefore, after the roller 4 touches the raised obstacle, the spring 34 is stretched to the right, and the first annular bag 52 is squeezed to the right through the slider 32 to expand in the width direction of the shell 31, leaving room for the slider 32 to retreat. Space, when the roller 4 as a whole passes over the raised obstacle, under the elastic force of the spring 34, the roller 4 moves to the left and returns to the contact position with the borehole wall, and the electromagnet 51 is controlled to be powered on again according to the amplitude of the detected pressure change, so that the magnetorheological fluid inside the first annular bag 52 changes from liquid to solid, thereby abutting against the right end face of the slider 32, limiting the moving position of the slider 32, and then maintaining this state to continue moving down along the hole wall for detection, until it touches the obstacle and repeats the above steps.

[0029] Example 3 This embodiment is based on Embodiment 1 and is another optional implementation scheme of the locking assembly. The specific structure of the locking assembly includes a conductive rod and a second annular bag; one end of the conductive rod is fixed to the inner wall of the shell 31, the electromagnet 51 is electrically connected to the control module, and a through hole is provided on the slider 32 for the conductive rod to pass through; the second annular bag is sleeved on the outside of the conductive rod, and the end faces of the second annular bag are respectively connected to the slider 32 and the inner wall of the shell 31, and the second annular bag is filled with electrorheological fluid. The control module controls the conductive rod to be turned on and off to change the electric field so that the electrorheological fluid can achieve solid-liquid conversion. When the electrorheological fluid is in a solid state, it will abut against the slider 32 to limit the position.

[0030] In this embodiment, the locking component uses the solid-liquid transformation of the electrorheological fluid to achieve the limit locking function of the slider 32, which is similar to the working principle of the above-mentioned magnetorheological fluid. During the normal movement process, the moving position of the locking component slider 32 needs to be limited. The control module controls the conductive rod to be in a powered state, so that the conductive rod generates an electric field. Since the second annular bag is sleeved on the conductive rod, it is affected by the electric field, so that the electrorheological fluid inside the second annular bag changes from liquid to solid, thereby abutting against the right end face of the slider 32 to limit the moving position of the slider 32. During the contact and movement of the roller 4 with the borehole wall, a supporting force is provided to the roller 4 to ensure that the roller 4 contacts the borehole wall in a rigid form, so that the three groups of auxiliary support units maintain the centering function of the TV detector body 1. When encountering a raised obstacle and needing to release the limit on the moving position of the slider 32 so that the roller 4 can elastically retract to overcome the obstacle, the control module controls the conductive rod to be powered off. After the conductive rod is powered off The electric field is no longer generated, so that the electrorheological fluid inside the second annular bag changes from a solid state to a liquid state, and the interior of the second annular bag is converted into a flexible structure as a whole. At this time, no force is generated to resist the right end face of the slider 32. Therefore, after the roller 4 touches the raised obstacle, the spring 34 is stretched to the right, and the first annular bag 52 is squeezed to the right through the slider 32 to expand it in the width direction of the shell 31, leaving space for the slider 32 to retreat. After the roller 4 passes over the raised obstacle as a whole, under the elastic force of the spring 34, the roller 4 moves to the left and returns to the contact position with the borehole wall. According to the amplitude of the detected pressure change, the electromagnet 51 is controlled to be energized again, so that the electrorheological fluid inside the second annular bag changes from a liquid state to a solid state, thereby resisting the right end face of the slider 32, limiting the moving position of the slider 32, and then maintaining this state to continue to move downward along the hole wall for detection until the obstacle is touched and the above steps are repeated.

[0031] In another embodiment of the present invention, Figure 2 As shown, in order to facilitate the installation of the electromagnet 51 or the conductive rod and enable the slider 32 to be evenly stressed, a through hole is set in the middle of the slider 32. At the same time, in order to maintain a stable supporting force for the roller 4, two groups of moving rods 33 and springs 34 are provided, which are symmetrically arranged on both sides of the slider 32 with the center line of the through hole as the axis. Through the above arrangement, the electromagnet 51 or the conductive rod is located in the middle of the shell 31, which makes it easy to keep the position of the first annular bag 52 or the second annular bag centered, so that when the liquid in the first annular bag 52 or the second annular bag is converted into a solid, it effectively abuts against the right end face of the slider 32 and is stressed in the center. When the liquid in the first annular bag 52 or the second annular bag is converted into a liquid, it is convenient for the slider 32 to evenly squeeze and expand the first annular bag 52 or the second annular bag.

[0032] In another embodiment of the present invention, Figure 1 As shown, in order to facilitate the connection between the TV detector body 1 and the cable lowering structure, a cover body 6 is provided on the top of the TV detector body 1, and a connector for connecting to the cable is provided on the top of the cover body 6. The upper end of the TV detector body 1 is slidably connected to the inside of the cover body 6, and the inner top surface of the cover body 6 and the top of the TV detector body 1 are connected by a connecting component 61.

[0033] In another embodiment of the present invention, in order to realize the detection process of adapting to boreholes of different diameters, a connecting ring 7 is provided on the outer side of the TV detector body 1, and three rotating sleeves 72 are evenly connected to the connecting ring 7 for rotation. The shells 31 in the three groups of auxiliary support units are fixedly connected to the three rotating sleeves 72 through the connecting rod 2 one by one, and a rotating mechanism is provided on the TV detector body 1. The rotating mechanism is connected to the three rotating sleeves 72, which is used to synchronously drive the three rotating sleeves 72 to rotate around the connecting ring 7 to adjust the opening angle of the rollers 4 in the three groups of auxiliary support units. Through the above arrangement, the opening angle of the rollers 4 in the three groups of auxiliary support units can be adjusted by the rotating mechanism according to the borehole walls of different diameters, so that the rollers 4 in the three groups of auxiliary support units contact the borehole walls for guidance.

[0034] The rotating mechanism includes three incomplete gears 81 and three racks 82 and a connecting assembly 61 composed of a hydraulic cylinder or an electric telescopic rod. The three incomplete gears 81 are fixed on three rotating sleeves 72 one by one, and the three racks 82 are vertically evenly distributed and fixed on the outer wall of the TV detector body 1. The three racks 73 are meshed with the three incomplete gears 72 one by one. The cylinder body of the hydraulic cylinder or the electric telescopic rod is fixed to the inner top surface of the cover body 6, and the end of the telescopic rod of the hydraulic cylinder or the electric telescopic rod is fixed to the top of the TV detector body 1. In this embodiment, when the rotating mechanism is used to adjust the opening angle of the rollers 4 in the three groups of auxiliary support units, the hydraulic cylinder or the electric telescopic rod is controlled to extend and retract, so that a relative longitudinal displacement change occurs between the TV detector body 1 and the cover body 6, so that the three racks 73 fixed on the TV detector body 1 and the connecting ring 7 connected to the bottom of the cover body 6 produce relative movement, thereby driving the three incomplete gears 81 to rotate to drive the three rotating sleeves 72 to rotate, and finally driving the three groups of auxiliary support units to rotate around the rotating sleeve 72, changing the opening angle of the rollers 4 so that they are suitable for abutting against the walls of holes with different diameters.

[0035] In summary, the present invention replaces the three elastic telescopic support rods of the past with three groups of auxiliary support units for centering support. The locking components in the three groups of auxiliary support units can lock the position of the slider during the descent detection process, so that the three groups of auxiliary support units are all rigid support structures, and the length is guaranteed to be consistent. The pressure value of the contact between the end of the moving rod and the hole wall is detected in real time by a pressure detection module arranged at the end of the moving rod. When the hole wall is smooth and flat, the pressure change tends to be stable. When a certain auxiliary support unit encounters a raised obstacle on the wall of the drill hole, it is blocked by the raised obstacle, and the end of the moving rod in contact with it produces a large pressure change. At this time, the control module controls the locking component to release the locking state of the position of the slider in the current auxiliary support unit after detecting the pressure change, so that it can be retracted under the action of the spring to cross the raised obstacle. During this process, the remaining two groups of auxiliary support units still maintain their length unchanged due to the presence of the locking component, and are in rigid contact with the hole wall, so that the TV detector can be ensured to be in a centered position during the obstacle crossing process, thereby reducing the detection error in the obstacle crossing process.

[0036] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A borehole television detection device for geophysical exploration, comprising a television detector body (1) and an auxiliary support mechanism, characterized in that: The auxiliary support mechanism comprises three groups of auxiliary support units which are evenly distributed and arranged around the outer wall of the television detector body (1), and the auxiliary support units include: The elastic telescopic rod comprises: a shell (31), one side of which is connected to the outer wall of the TV detector body (1); a slider (32), which is slidably connected to the inside of the shell (31); a moving rod (33), one end of which is fixedly connected to the side wall of the slider (32) away from the TV detector body (1), and the other end of which extends to the outside of the shell (31); a spring (34), which is sleeved on the moving rod (33), and the two ends of the spring (34) are respectively connected to the slider (32) and the shell (31); A locking assembly, connected between the housing (31) and the slider (32), and used to lock the slider (32) in the housing (31); A pressure detection module and a control module, the control module being connected to the pressure detection module and the locking assembly respectively, the pressure detection module being arranged at the other end of the moving rod (33), the pressure detection module being used to detect the pressure value generated by the end of the moving rod (33) contacting the wall of the borehole, when the end of the moving rod (33) contacts the raised obstacle and generates a pressure change, the control module controls the locking assembly to release the lock on the slider (32), so that the moving rod (33) can be elastically extended and retracted to pass over the raised obstacle under the elastic action of the spring (34).

2. The borehole television detection device for geophysical exploration according to claim 1, characterized in that: The other end of the moving rod (33) is connected to a roller (4) via a bracket (41), and the pressure detection module is arranged in the circumference of the roller (4).

3. The borehole television detection device for geophysical exploration according to claim 2, characterized in that: The pressure detection module comprises a plurality of pressure sensors, a plurality of mounting grooves are evenly distributed in the circumference of the roller (4), the plurality of pressure sensors are fixed in the plurality of mounting grooves in a one-to-one correspondence, and the plurality of pressure sensors are electrically connected to the control module respectively.

4. The borehole television detection device for geophysical exploration according to claim 3, characterized in that: The locking assembly comprises: The electromagnet (51) is cylindrical, one end of the electromagnet (51) is fixed to the inner wall of the housing (31), the electromagnet (51) is electrically connected to the control module, a through hole is provided on the slider (32), and the electromagnet (51) is inserted into the through hole; The first annular bag (52) is sleeved on the outside of the electromagnet (51), and the end surfaces of both ends of the first annular bag (52) are respectively connected to the slider (32) and the inner wall of the housing (31). The first annular bag (52) is filled with magnetorheological fluid. The control module controls the electromagnet (51) to switch on and off to change the magnetic field so that the magnetorheological fluid can achieve solid-liquid conversion. When the magnetorheological fluid is in a solid state, it abuts against the slider (32) to limit the position.

5. The borehole television detection device for geophysical exploration according to claim 3, characterized in that: The locking assembly comprises: A conductive rod, one end of which is fixed to the inner wall of the housing (31); the electromagnet (51) is electrically connected to the control module; and the slider (32) is provided with a through hole for the conductive rod to pass through; The second annular bag is sleeved on the outside of the conductive rod, and the end surfaces of both ends of the second annular bag are respectively connected to the slider (32) and the inner wall of the housing (31). The second annular bag is filled with electrorheological fluid. The conductive rod is controlled by a control module to switch on and off to change the electric field so that the electrorheological fluid can achieve solid-liquid conversion. When the electrorheological fluid is in a solid state, it abuts against the slider (32) to limit the position.

6. The borehole television detection device for geophysical exploration according to claim 4 or 5, characterized in that: The through hole is arranged in the middle of the slider (32), and the moving rod (33) and the spring (34) are provided in two groups, which are symmetrically arranged on both sides of the slider (32) with the center line of the through hole as the axis.

7. The borehole television detection device for geophysical exploration according to claim 6, characterized in that: A cover body (6) is provided on the top of the television detector body (1); a connector for connecting to a cable is provided on the top of the cover body (6); the upper end of the television detector body (1) is slidably connected to the inside of the cover body (6); and the inner top surface of the cover body (6) and the top of the television detector body (1) are connected via a connecting assembly (61).

8. The borehole television detection device for geophysical exploration according to claim 7, characterized in that: The outer side of the TV detector body (1) is provided with a connecting ring (7), the top of the connecting ring (7) and the bottom of the cover body (6) are connected via a plurality of fixing rods (71), three rotating sleeves (72) are evenly rotatably connected to the connecting ring (7), the shells (31) in the three groups of auxiliary support units are respectively fixedly connected to the three rotating sleeves (72) in a one-to-one correspondence via connecting rods (2), and a rotating mechanism is provided on the TV detector body (1), the rotating mechanism is connected to the three rotating sleeves (72), and is used to synchronously drive the three rotating sleeves (72) to rotate around the connecting ring (7) to adjust the opening angles of the rollers (4) in the three groups of auxiliary support units.

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