A camera lens centering device suitable for horizontal holes or upward holes

Abstract

The invention discloses a camera lens centering device suitable for a horizontal hole or an upward hole, comprising a shaft rod, a camera lens fixedly arranged at the front end of the shaft rod, and several pairs of rotatable rolling wheels arranged on the shaft rod, the several pairs of rolling wheels being arranged along a straight line, and the wheel surfaces being parallel to each other; the rolling wheels of the device are parallel to each other, so when the hole changes in diameter, the rolling wheels will not be stuck at the diameter change position, and soil accumulation in the hole will not prevent the device from moving forward; at the same time, the centering of the camera lens is guaranteed, so that the camera lens is away from dirt on the hole wall, and the centering also solves the problem of large chromatic aberration of images in different radial directions, thereby ensuring the authenticity of the captured images; the rotatable rolling wheels also make the advancement work easier; in addition, the rolling wheels adopt a stepped structure, and different outer diameters can be applied to holes of different apertures through different front and back installations, thereby saving materials and costs.

Description

Technical Field

[0001] The invention relates to the field of in-hole camera equipment for geophysical exploration, and in particular to a camera lens centering device suitable for horizontal holes or upward holes. Background Art

[0002] At present, the panoramic digital imaging technology of the borehole wall is becoming increasingly mature, and the imaging technology of horizontal holes and upward holes has developed to a certain extent in recent years. It has solved the problem of calculating cracks in horizontal holes and inclined holes, and solved the technical bottleneck problem faced by the industry for many years.

[0003] The actual rock core obtained from drilling is an effective form of displaying the rock mass, but the condition of the rock mass cannot be completely judged based on the state of the rock core. The rock cores taken out by different drilling rigs, different processes, and different personnel are very different. The amount of information contained in the actual rock core is relatively small. The images taken on the hole wall contain more geological information. Not only can the original state of the rock mass be observed, but the inclination, dip, tendency, strike, and width of the fracture structural surface can also be interpreted, which plays a great role in geological exploration.

[0004] According to a drilling television camera lens propulsion device disclosed in publication number CN104297889A, the device comprises a camera lens, a support rod is provided at the rear end of the camera lens, the support rod is a hollow structure tube body for threading, and a horizontal roller group and a vertical roller group are provided on the support rod to drive the support rod to move forward and backward, and the horizontal roller group and the vertical roller group are perpendicular to each other. It ensures the centering of the camera during the process of advancing the camera lens, and the image will not be deformed due to the lens offset, thereby improving the calculation accuracy. However, there are still certain defects in actual use. There is soil or small gravel under the horizontal hole or the upward hole. Since the roller groups in two directions are staggered, when the lens is continuously advanced, the soil or small gravel between the roller groups will accumulate more and more, resulting in the obstruction of the camera lens advancement and difficulty in advancement; in addition, the phenomenon of drilling diameter change often exists. When the camera lens reaches the position of diameter change, the roller group of the vertical roller group perpendicular to the step at the diameter change can pass, while the horizontal roller group parallel to the step at the diameter change may be stuck at the step, resulting in the inability to advance the lens. Summary of the invention

[0005] The purpose of the present invention is to provide a camera lens centering device suitable for horizontal holes or upward holes. Under the premise of ensuring the centering of the lens, blockage caused by the accumulation of soil and gravel can be avoided during the advancement of the device, and the wheel-type design ensures the smooth advancement of the device; when the device encounters a step where the diameter of the drill hole changes, several pairs of parallel rolling wheels arranged on the device can easily roll over the step at the diameter change, avoiding the device from getting stuck at the diameter change step; each type of rolling wheel can be installed in both directions and is suitable for two different apertures.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a camera lens centering device suitable for a horizontal hole or an upward hole, comprising a shaft rod, a camera lens is fixedly connected to the front end of the shaft rod, and several pairs of rotatable rolling wheels are arranged on the shaft rod, each pair of the rolling wheels includes two rolling wheels symmetrically arranged on both sides of the shaft rod, and the wheel surfaces of the several pairs of the rolling wheels are parallel to each other.

[0007] Preferably, the outer ring of the rolling wheel is in a step shape, and the left and right sides of the rolling wheel have different outer diameters.

[0008] Preferably, an annular protrusion is provided in the middle hollow portion of the rolling wheel, and a pair of bearings are installed at both ends of the annular protrusion.

[0009] Preferably, a mounting hole is provided on the shaft rod, and the rolling wheel is mounted on the shaft rod by means of a screw with a self-locking nut passing through an intermediate bearing and the mounting hole.

[0010] Preferably, when the outer diameter of the rolling wheel is relatively large, a hollow screw is provided on the screw between the rolling wheel and the shaft rod.

[0011] Preferably, a long screw is fixed inside the front end of the shaft rod, the long screw is cylindrical, and its outer diameter is the same as the inner diameter of the shaft rod; a long nut is fixed inside the rear end of the shaft rod, the long nut is cylindrical, and its outer diameter is the same as the inner diameter of the shaft rod.

[0012] Preferably, the camera lens is connected to the shaft rod through a lens connector, the lens connector is provided with a groove matching the camera lens, the other end of the groove of the lens connector is provided with an internal thread connected to the screw thread at the front end of the shaft rod, and the tail of the lens connector is tapered.

[0013] Preferably, a wire reserved opening and a clamping threaded hole are provided on the side of the lens connector.

[0014] Preferably, a rubber gasket is provided between the lens connector and the shaft rod.

[0015] Preferably, a guide is fixedly provided at the rear end of the shaft rod, and a through hole penetrating the shaft rod is opened in the middle of the guide. The outer portion of the guide is first cylindrical, and the rear end gradually shrinks to a conical shape, with the cylindrical shape facing the front end of the shaft rod.

[0016] Preferably, the cylindrical portion of the guide is provided with a fixing threaded hole and a wire groove for the camera lens wire to pass through, and the guide and the shaft are fixed by fixing screws.

[0017] The present invention has the following beneficial effects:

[0018] 1. The device of the present invention is provided with several pairs of parallel rolling wheels. When the device encounters soil and gravel during the advancement process, the soil and gravel can pass through the middle of each pair of parallel rolling wheels without gradually accumulating, and the soil and gravel will not cause blockage of the device.

[0019] 2. When the device of the present invention encounters a step with a changing diameter during advancement, since the directions of the pairs of rolling wheels are parallel to each other, the rolling wheels can directly roll over the step at the changing diameter, thereby ensuring that the lens itself will not get stuck at the changing diameter.

[0020] 3. The present invention uses several pairs of parallel rolling wheels to ensure that the camera lens installed on the shaft is always centered, which solves the problem of large chromatic aberration of images in different radial directions and ensures the authenticity of the captured image; the lens is away from the hole wall to prevent dirt on the hole wall from adhering to the optical lens; the image captured after the camera lens is centered is not deformed, which can reduce the inclination angle of the structural surface and the calculation error of the inclination; the rolling wheels make the device easier to advance and reduce the friction between the device and the hole wall.

[0021] 4. During the advancement of the device of the present invention, the camera lens is more stable, the friction between the camera lens and the hole wall is overcome, the swinging of the gyroscope that can rotate freely inside the lens is reduced, and the degree of image deformation is reduced.

[0022] 5. During the advancement process, the advancement speed of the device of the present invention is easier to control, thus overcoming the phenomenon of sudden advancement and sudden stop, and the image continuity is better.

[0023] 6. The outer ring of the rolling wheel of the present invention is stepped, and the left and right sides have different outer diameters. A pair of rolling wheels can be installed on the front and back sides and can be applied to two different sizes of apertures, saving materials and costs.

[0024] 7. The rear end of the shaft rod of the present invention is provided with a tapered guide and the tail of the lens connector is tapered, which is conducive to easier extraction of the device when the diameter changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention applicable to apertures of 75 mm and 90 mm.

[0026] Figure 2 It is a schematic diagram of the structure of the present invention applicable to apertures of 110 mm and 130 mm.

[0027] Among them: 1. Clamping threaded hole; 2. Lens connector; 3. Rubber gasket; 4. Long screw; 5. Screw with self-locking nut; 6. Shaft; 7. Rolling wheel; 8. Bearing; 9. Guide; 10. Fixing screw; 11. Long nut; 12. Hollow screw. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings. As shown in the figure, the present invention provides a technical solution: a camera lens centering device suitable for a horizontal hole or an upward hole, comprising a shaft rod 6, a front end of the shaft rod 6 is fixedly connected to the camera lens through a lens connector 2, and several pairs of rotatable rolling wheels 7 are arranged on the shaft rod 6, and the rolling wheels 7 are conducive to the advancement of the device; each pair of rolling wheels 7 includes two rolling wheels 7 symmetrically arranged on both sides of the shaft rod 6, and several pairs of rolling wheels 7 roll along the same plane, and the wheel surfaces are parallel to each other. When working, the posture of the rolling wheels 7 displayed on the instrument can ensure that the wheel surfaces of the rolling wheels 7 are in a vertical state with the hole wall. The soil on the hole wall can pass through between each pair of wheels to avoid the gradual accumulation of soil, which makes the device difficult to advance. The present invention sets several pairs of rolling wheels 7 to be parallel to each other, which can avoid the problem of the device being difficult to advance caused by the steps and soil accumulation at the diameter change; each pair of rolling wheels 7 is tangent to the hole at 4 points, which always ensures that the camera lens is centered, solves the problem of large chromatic aberration of images in different radial directions, and ensures the authenticity of the captured image; the lens is centered to keep the lens away from the hole wall, avoiding the dirt on the hole wall from adhering to the optical lens; the lens centering can reduce graphic deformation, reduce the inclination angle of the structural surface, and reduce the calculation error of the inclination.

[0029] The shaft 6 has a mounting hole at the position where the rolling wheel 7 needs to be installed. The rolling wheel 7 is installed on the shaft 6 by means of a screw 5 with a self-locking nut. Three pairs of rolling wheels 7 are arranged on the shaft 6 in parallel with each other. An annular protrusion is arranged in the hollow part in the middle of each rolling wheel 7. A pair of bearings 8 are installed at both ends of the annular protrusion. Fixing the rolling wheel 7 with two bearings 8 can effectively prevent the wheel from falling off. The outer ring of the rolling wheel 7 is in a step shape. The left and right sides of the rolling wheel 7 have different outer diameters, one side is larger and the other side is smaller. By installing the rolling wheel 7 in different front and back directions, the hole diameter applicable to the side with a larger outer diameter of the outer ring of the rolling wheel 7 facing outward is larger than the hole diameter applicable to the side facing inward. Therefore, a set of rolling wheels 7 can be applicable to two hole diameters with different diameters, which is conducive to saving materials and costs. The screw 5 with a self-locking nut passes through the mounting hole on the shaft 6 to install the rolling wheel 7 on the shaft 6. The screws 5 with self-locking nuts used for the forward and reverse installation of the rolling wheel 7 have different lengths. When used in a larger hole diameter, a hollow screw 12 is sleeved on the screw 5 with the self-locking nut between the rolling wheel 7 and the shaft 6. The hollow screw 12 has a limiting effect on the rolling wheel 7, which can increase the distance between each pair of wheels, ensure that the contact points between each pair of wheels and the hole wall are evenly distributed along the circumference, and prevent the rolling wheel 7 from moving back and forth on the screw 5 with the self-locking nut.

[0030] The shaft 6 is a pressure tube with high strength and is not easy to bend. It has a certain guiding function and ensures that the mirror axis is consistent with the aperture axis. A long screw 4 is welded inside the front end rod of the shaft 6, which is cylindrical, and the outer diameter of the long screw 4 is the same as the inner diameter of the shaft 6. A long nut 11 is welded inside the rear end rod of the shaft, which is cylindrical, and the outer diameter of the long nut 11 is the same as the inner diameter of the shaft 6. The long screw 4 and the long nut 11 are both connected. The selection of internal welding of the long screw 4 and the long nut 11 can ensure that the straightness axis of the long screw 4 and the long nut 11 after being connected to the shaft is in a straight line, which reduces the process difficulty of machining the thread inside and ensuring the straightness machining when welding the long screw 4 and the long nut 11 on the shaft 6. The push rod that needs to be added later is threadedly connected to the long nut 11, and the long screw 4 at the front end is threadedly connected to the lens connector 2. The lens connector 2 is a columnar structure as a whole, and a groove matching the camera lens is opened at one end, which is adapted to the size of the rear end of the camera lens. The tail of the lens connector 2 gradually shrinks into a cone shape, and an internal thread is provided inside the tail cone, which can be connected with the long screw 4 at the front end of the shaft 6. A rubber gasket 3 is provided between the lens connector 2 and the long screw 4 of the shaft 6 to make the connection more secure; a wire reservation opening and a clamping threaded hole 1 are provided on the side of the lens connector 2. The wire reservation opening facilitates the wires of the camera lens to pass through, and screws are installed on the clamping threaded hole 1 to fasten the camera lens to the lens connector 2.

[0031] Finally, a guide 9 is fixedly provided at the rear end of the shaft rod 6. One end of the outer portion of the guide 9 is cylindrical and gradually shrinks into a conical shape. The cylindrical structure faces the front end of the shaft rod 6. The rear end is the same as the rear end of the lens connector 2. The cone shape is designed to make it easier to pull out at the variable diameter position to prevent the device from being blocked when being pulled out. A fixed threaded hole is provided in the cylindrical part of the guide 9, and the guide 9 is fixed to the shaft rod 6 with a fixing screw 10. The guide 9 is also provided with a wire groove for the camera lens wire to pass through, which serves to protect and limit the wire. When the aperture increases, the size of the guide 9 increases accordingly.

[0032] In geological exploration, the common borehole diameters are 75mm, 90mm, 110mm, and 130mm. Figure 1 and Figure 2 , but the present invention is not limited to these four apertures.

[0033] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

Claims

1. A camera lens centering device suitable for a horizontal hole or an upward hole, comprising a shaft rod, characterized in that: A camera lens is fixedly connected to the front end of the shaft, and three pairs of rotatable rolling wheels are arranged on the shaft, each pair of the rolling wheels includes two rolling wheels symmetrically arranged on both sides of the shaft, and the wheel surfaces of the three pairs of rolling wheels are parallel to each other; the outer ring of the rolling wheel has a step-shaped structure, so that the left and right sides of the rolling wheel have different outer diameters, and through the different installation of the front and back of the rolling wheel, when the side with a larger outer diameter of the outer ring of the rolling wheel faces outward, the applicable aperture is larger than the applicable aperture when it faces inward.

2. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 1, characterized in that: An annular protrusion is arranged in the middle hollow part of the rolling wheel, and a pair of bearings are installed at both ends of the annular protrusion.

3. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 2, characterized in that: The shaft rod is provided with a mounting hole, and the rolling wheel is mounted on the shaft rod through a screw with a self-locking nut passing through an intermediate bearing and the mounting hole.

4. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 3, characterized in that: When the side with a larger outer diameter of the rolling wheel faces outward, a hollow screw rod is arranged on the screw between the rolling wheel and the shaft rod.

5. The camera lens centering device suitable for horizontal holes or upward holes according to claim 1, characterized in that: A long screw is fixed inside the front end of the shaft rod, the long screw is cylindrical, and its outer diameter is the same as the inner diameter of the shaft rod; a long nut is fixed inside the rear end of the shaft rod, the long nut is cylindrical, and its outer diameter is the same as the inner diameter of the shaft rod.

6. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 5, characterized in that: The camera lens is connected to the shaft rod through a lens connector, which is provided with a groove matching the camera lens. The other end of the groove of the lens connector is provided with an internal thread which is threadedly connected to the screw at the front end of the shaft rod, and the tail of the lens connector is tapered.

7. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 6, characterized in that: A wire reserved opening and a clamping threaded hole are provided on the side of the lens connector.

8. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 6, characterized in that: A rubber gasket is arranged between the lens connector and the shaft rod.

9. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 1, characterized in that: A guide is fixedly arranged at the rear end of the shaft rod, and a through hole penetrating the shaft rod is opened in the middle of the guide. The outer part of the guide is cylindrical at first, and the rear end gradually shrinks into a conical shape, with the cylindrical shape facing the front end of the shaft rod.

10. The camera lens centering device suitable for a horizontal hole or an upward hole according to claim 9, characterized in that: The cylindrical part of the guide is provided with a fixing threaded hole and a wire groove for the camera lens wire to pass through, and the guide and the shaft rod are fixed by fixing screws.

Images