A positioning and correction structure for a well casing

Abstract

The application provides a positioning and deviation rectifying structure of a well drilling casing, which comprises a shell and a deviation rectifying assembly arranged in the shell. The shell is arranged above a borehole. The deviation rectifying assembly comprises a sleeve, a deviation rectifying roller shaft support and a deviation rectifying roller shaft. The sleeve is arranged in the shell. A plurality of slots are arranged in the circumference of the inner ring of the sleeve. One deviation rectifying roller shaft support is slidably connected to the periphery of each slot. One deviation rectifying roller shaft is rotatably arranged in each deviation rectifying roller shaft support. The periphery of each deviation rectifying roller shaft is rollably connected to the periphery of a downstream casing. The radial positions of each deviation rectifying roller shaft in the borehole are the same. The deviation rectifying assembly can limit the movement path of the downstream casing. The positioning and deviation rectifying structure of the well drilling casing ensures that the casing is centered in the borehole through the rolling contact between the periphery of the downstream casing and the plurality of deviation rectifying roller shafts, thereby preventing the downstream casing from deviating during the descending process.

Description

Technical Field

[0001] This invention belongs to the field of drilling casing, and in particular relates to a positioning and correction structure for drilling casing. Background Technology

[0002] Drilling operations in the coal mining industry are primarily conducted to meet the needs of safe production, efficient mining, and system support underground. Various types of boreholes are constructed to achieve gas extraction, water exploration and drainage, pressure relief and outburst prevention, and support and anchoring. This prevents safety accidents such as gas, water hazards, and roof collapses from the source. Simultaneously, it provides working conditions for blasting coal, roadway excavation, coal seam exploration, ventilation and drainage, and grouting reinforcement, ensuring the smooth progress of coal mining processes and improving mine safety and production efficiency. However, during the process of inserting casing into the borehole, the casing is easily affected by the weight of the rock strata and construction disturbances, leading to problems such as radial displacement and casing jamming. This results in misalignment between the casing and the borehole, uneven grout distribution during subsequent grouting reinforcement, and difficulty in guaranteeing support quality. Summary of the Invention

[0003] In view of this, the present invention aims to propose a positioning and correction structure for drilling casing to solve the problem that the casing is easily affected by the weight of the rock formation and construction disturbance when it is lowered into the borehole, resulting in radial displacement, misalignment between the casing and the borehole, and uneven distribution of grout during subsequent grouting reinforcement.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A positioning and correction structure for drilling casing includes a housing and a correction component disposed inside it. The housing is disposed above the borehole. The correction component includes a sleeve, a correction roller frame, and a correction roller. The sleeve is disposed inside the housing. The inner ring of the sleeve has multiple slots along the circumference. A correction roller frame is slidably connected to the outer periphery of each slot. A correction roller is rotatably disposed inside each correction roller frame. The outer periphery of each correction roller can be rollably connected to the outer periphery of the downstream casing. The radial position of each correction roller is the same within the borehole. The correction component can restrict the movement path of the downstream casing.

[0006] Furthermore, an adjustment component is also provided inside the housing. The adjustment component is located below the correction component and can adjust the position of each correction roller in the corresponding slot.

[0007] Furthermore, the adjustment assembly includes a lead screw, a spline rod, and a spline wheel. One end of a lead screw is rotatably connected to the outer side of each correction roller frame. The outer periphery of each lead screw is threaded into a sleeve. A spline rod is installed at the other end of each lead screw. The outer periphery of each spline rod is slidably connected to the inner ring of a spline wheel.

[0008] Furthermore, the adjustment assembly also includes a first helical gear and a second helical gear. Each spline wheel is fitted with a first helical gear, and the outer peripheries of multiple first helical gears mesh with the second helical gear. The second helical gear is rotatably disposed within the housing.

[0009] Furthermore, the adjustment assembly also includes a first gear, a second gear, a shaft, and a handwheel. The first gear is fixedly sleeved around the periphery of the first helical gear. Both the first gear and the second gear are rotatably disposed within the housing, and the periphery of the first gear meshes with the periphery of the second gear. The middle part of the second gear is coaxially connected to one end of the shaft, and the other end of the shaft is equipped with a handwheel, and the periphery of the shaft is rotatably connected to the upper end of the housing.

[0010] Furthermore, a snap-fit ​​sleeve is provided at the lower end of the housing, which can be inserted into the drill hole, and the lower end of the housing is fixed to the foundation.

[0011] Compared with the prior art, the drilling casing positioning and correction structure of the present invention has the following advantages:

[0012] (1) The positioning and correction structure of the drilling casing of the present invention ensures that the casing is centered in the borehole and prevents the downstream casing from shifting during the descent by means of rolling contact between the outer periphery of the downstream casing and multiple correction rollers, and the radial position of each correction roller is the same in the borehole.

[0013] (2) The positioning and correction structure of the drilling casing described in this invention is equipped with an adjustment component, which can synchronously adjust the radial position of each correction roller shaft to adapt to downstream casings of different diameters, expand the overall device's adaptability range, ensure that casings of different diameters are always in the center of the borehole, and prevent the casing from deviating and getting stuck during the descent process.

[0014] (3) The positioning and correction structure of the drilling casing described in this invention realizes the synchronous radial adjustment of multiple correction roller shafts through a handwheel and multi-stage gear transmission, ensuring that multiple correction roller shafts can move synchronously and equidistantly, and the adjustment process is smooth and convenient, and is suitable for correction of casings of different specifications.

[0015] (4) The positioning and correction structure of the drilling casing described in this invention can improve the connection stability between the casing and the borehole, avoid the casing from shifting or shaking during docking and correction, and improve the positioning accuracy of casing docking and casing lowering.

[0016] (5) The positioning and correction structure of the drilling casing described in this invention, through the cooperation of the clamping component and the tightening component, pushes the tightening component closer to the upstream casing by the clamping components on both sides to prevent the upstream casing from shaking, and drives the upstream casing to rotate by the rolling friction force through the rotation of the tightening component, so as to screw the threaded end of the upstream casing into the upper end of the downstream casing to connect the two casing sections, extend the overall length, and improve working efficiency.

[0017] (6) The positioning and correction structure of the drilling casing of the present invention is provided with a clamping component. The clamping component can push the tightening component closer to or away from the upstream casing. When it is close, it can fix the lower end of the upstream casing to prevent the upstream casing from shaking and ensure that the lower end of the upstream casing and the upper end of the downstream casing are stably connected.

[0018] (7) The positioning and correction structure of the drilling casing of the present invention is provided with a tightening assembly. One roller shaft is driven to rotate by the driving part, and the other roller shaft is driven by the roller shaft. The rolling contact method is adopted, and the upstream casing is rotated by the rolling friction force, so that the upstream casing is screwed into the downstream casing.

[0019] (8) The positioning and correction structure of the drilling casing described in this invention flexibly connects one end of the mounting bracket and the slider through a hydraulic rod. During the process of screwing the upstream casing into the downstream casing, the tightening component can slowly descend with the downstream casing. After tightening, the tightening component is pushed back to its original position by the liquid pressure in the hydraulic rod, which is convenient to adapt to the movement trajectory of the upstream casing. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is an overall schematic diagram of a drilling casing positioning and correction structure according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the tightening assembly described in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the drive unit according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the clamping assembly described in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the chute described in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the fixing component according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the fixing block according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the correction component described in an embodiment of the present invention;

[0029] Figure 9This is a partial cross-sectional schematic diagram of the sleeve according to an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the correction roller shaft described in an embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the snap-fit ​​sleeve according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Upstream sleeve; 2-Downstream sleeve; 3-Tightening assembly; 31-Mounting bracket; 311-Slide groove; 32-Roller shaft; 33-Drive unit; 331-Rotating motor; 332-Synchronous pulley; 333-Synchronous belt; 4-Clamping assembly; 41-Support block; 42-Slider; 43-First hydraulic cylinder; 44-Hydraulic rod; 5-Housing; 51-Snap-fit ​​sleeve; 6-Fixing assembly; 61-Support ring; 611-Through hole; 62-Fixing block; 63-Second hydraulic cylinder; 7-Correction assembly; 71-Sleeve; 711-Groove; 72-Correction roller shaft frame; 73-Correction roller shaft; 8-Adjusting assembly; 81-Lead screw; 82-Splined rod; 83-Splined wheel; 84-First helical gear; 85-Second helical gear; 86-First gear; 87-Second gear; 88-Shaft; 89-Handwheel. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] like Figure 1 As shown, a positioning and correction structure for drilling casing includes a tightening assembly 3, a clamping assembly 4, and a housing 5. The housing 5 is installed at the upper end of the borehole, and a casing channel is provided in the middle of the housing 5. The casing moves within the casing channel. Two clamping assemblies 4 are provided at the upper end of the housing 5, facing each other. A tightening assembly 3 is installed at the other end of each clamping assembly 4. The clamping assemblies 4 can drive the tightening assembly 3 to move closer to or away from the outer periphery of the upstream casing 1. The actuators of both tightening assemblies 3 can roll to connect with the outer periphery of the upstream casing 1 and drive the upstream casing 1 to rotate. During the borehole reinforcement process, multiple casings need to be lowered into the borehole, and... A reinforcing agent, such as concrete, is injected between the casing and the borehole to fix the casing inside the borehole and form a support structure. During the docking process of the upstream casing 1 and the downstream casing 2, the downstream casing 2 needs to be fixed first, and then the upstream casing 1 is hoisted above the downstream casing 2. The clamping components 4 on both sides push the tightening component 3 close to the upstream casing 1 to prevent the upstream casing 1 from shaking. The tightening component 3 rotates, and the rolling friction drives the upstream casing 1 to rotate. During the rotation, it slowly descends and screws the threaded end of the upstream casing 1 into the upper end of the downstream casing 2 to connect the two casing sections, extend the overall length, and improve work efficiency.

[0039] like Figure 2 and Figure 4As shown, the clamping assembly 4 includes a support block 41, a slider 42, and a first hydraulic cylinder 43. Two support blocks 41 are arranged opposite each other on the upper end of the housing 5. A first hydraulic cylinder 43 is installed in each support block 41. The movable end of each first hydraulic cylinder 43 is connected to one end of a slider 42. The periphery of each slider 42 is slidably connected to a support block 41. The first hydraulic cylinder 43 is existing technology, and its model is TAIYO-PARKER100H-2. When an upstream sleeve 1 is hoisted to the lower... When the upper part of the sleeve 2 is above the upper part of the sleeve, the controller starts the external hydraulic pump and extends the first hydraulic cylinder 43. The first hydraulic cylinder 43 pushes the slider 42 to slide along the support block 41. The slider 42 drives the tightening component 3 to move closer to or away from the upper sleeve 1, completing the clamping and releasing action. A clamping component 4 is provided. The clamping component 4 can push the tightening component 3 closer to or away from the upper sleeve 1. When it moves closer, it can fix the lower end of the upper sleeve 1 to prevent the upper sleeve 1 from shaking and ensure that the lower end of the upper sleeve 1 and the upper end of the lower sleeve 2 are stably connected.

[0040] like Figure 2 and Figure 3 As shown, each tightening assembly 3 includes a mounting frame 31, rollers 32, and a drive unit 33. One end of the slider 42 is slidably connected to the middle of the mounting frame 31. Two rollers 32 are rotatably arranged inside the mounting frame 31. The periphery of each roller 32 can be rolledly connected to the periphery of the upstream sleeve 1. The drive unit 33 is arranged at the lower end of the mounting frame 31. The drive unit 33 can drive any one of the rollers 32 to rotate. The drive unit 33 includes a rotary motor 331, a synchronous pulley 332, and a synchronous belt 333. The rotary motor 331 is arranged inside the mounting frame 31. The rotary motor 331 is existing technology, and the model of the rotary motor 331 is 49TYD-500-1. The periphery of the output shaft of the rotary motor 331 and the periphery of the synchronous pulley 332 are connected by a synchronous belt 333 to form a synchronous transmission structure. The synchronous pulley 332 is coaxially connected to any one of the rollers 32. After the lower end of one roller shaft 32 is clamped by the clamping components 4 on both sides and the tightening component 3 around the outer periphery of the upstream sleeve 1, the controller controls the output shaft of the rotating motor 331 to rotate. The output shaft drives the synchronous belt 333 to move, the synchronous belt 333 drives the synchronous wheel 332 to rotate, and the synchronous wheel 332 drives the roller shaft 32 to rotate. The roller shaft 32 rolls into contact with the upstream sleeve 1 and drives the upstream sleeve 1 to rotate. The output shafts of the two rotating motors 331 of the two tightening components 3 rotate in the same direction to prevent the upstream sleeve 1 from being subjected to different friction forces on both sides, which would affect the circumferential rotation. The tightening component 3 is set up so that one roller shaft 32 is driven to rotate by the drive unit 33 and the other roller shaft 32 is driven by it. The rolling contact method is adopted, and the rolling friction force drives the upstream sleeve 1 to rotate, so that the upstream sleeve 1 is screwed into the downstream sleeve 2.

[0041] like Figure 5As shown, each mounting bracket 31 has a groove 311 in the middle, and a corresponding slider 42 is slidably connected to one end of the outer periphery within each groove 311. A hydraulic rod 44 is provided on the bottom surface of each groove 311 and at the lower end of each slider 42. One end of the hydraulic rod 44 is connected to the bottom surface of the groove 311, and the other end is connected to the lower end of the slider 42. The hydraulic rod 44 is existing technology, and its model is MOBR. In the 63X200-LB model, during the process of screwing the upstream sleeve 1 into the downstream sleeve 2, in addition to circumferential rotation, the vertical position of the upstream sleeve 1 gradually moves downward as it tightens. The mounting bracket 31, roller 32, and drive unit 33 slowly move downward, and the slider 42 moves downward within the slide groove 311. The hydraulic rod 44 is located between the bottom surface of the slide groove 311 and the lower end of the slider 42. When the slider 42 moves, the hydraulic rod 44 is compressed. After the upstream sleeve 1 is screwed in, the tightening assembly 3 separates from the periphery of the upstream sleeve 1. The hydraulic rod 44 pushes the slider 42 back to its original position through elastic force, flexibly connecting one end of the mounting bracket 31 and the slider 42 through the hydraulic rod 44. During the process of screwing the upstream sleeve 1 into the downstream sleeve 2, the tightening assembly 3 can slowly descend with the downstream sleeve 2, and after tightening, the tightening assembly 3 is pushed back to its original position by the liquid pressure within the hydraulic rod 44, which facilitates adaptation to the movement trajectory of the upstream sleeve 1.

[0042] like Figure 6 and Figure 7 As shown, a fixing component 6 is provided inside the housing 5. The fixing component 6 is used to fix the downstream sleeve 2. The fixing component 6 includes a support ring 61 and a fixing block 62. The support ring 61 is provided inside the housing 5. The upper end of the support ring 61 has multiple through holes 611 along the circumference. The lower periphery of the fixing block 62 is slidably connected in each through hole 611. The upper inner side of the fixing block 62 can abut against the periphery of the downstream sleeve 2. The fixing component 6 also includes a second hydraulic cylinder 63. A second hydraulic cylinder 63 is fixedly connected to one side of each fixing block 62. Multiple second hydraulic cylinders 63 are fixedly installed inside the housing 5. The second hydraulic cylinder 63 is existing technology. The model of the second hydraulic cylinder 63 is TAIYO-PARKER100H-2. When it is necessary to connect the next section of the upstream sleeve 1, a command is sent to the controller. The controller drives the hydraulic press to control the extension of the second hydraulic cylinder 63, pushing the fixing block 62 to slide along the through hole 611 of the support ring 61. The fixing block 62 moves towards the center of the housing 5 and abuts against the outer wall of the downstream sleeve 2, thus stably fixing the downstream sleeve 2 inside the housing 5.

[0043] like Figure 8As shown, a correction assembly 7 is provided inside the housing 5. The correction assembly 7 includes a sleeve 71, a correction roller frame 72, and a correction roller 73. The sleeve 71 is provided inside the housing 5. The inner ring of the sleeve 71 has multiple slots 711 along the circumferential direction. A correction roller frame 72 is slidably connected to the outer periphery of each slot 711. A correction roller 73 is rotatably arranged inside each correction roller frame 72. The outer periphery of each correction roller 73 can be rollably connected to the outer periphery of the downstream sleeve 2. The correction assembly 7 can restrict the movement path of the downstream sleeve 2. During the insertion of the casing into the borehole, in order to evenly fill the space between the casing and the borehole with solidifying agent, the casing must be centered in the borehole, and the distance between its outer perimeter and the inner wall of the borehole must be the same. This way, the casing will not shift after being fixed and will be vertically downward. During the downward movement of the downstream casing 2, the casing is centered in the borehole through the rolling contact between the outer perimeter of the downstream casing 2 and multiple straightening rollers 73, and the radial position of each straightening roller 73 is the same in the borehole, thus preventing the downstream casing 2 from shifting during the descent.

[0044] like Figures 8-10 As shown, an adjustment component 8 is also provided inside the housing 5. The adjustment component 8 is located below the correction component 7. The adjustment component 8 can adjust the position of each correction roller shaft 73 in the corresponding slot 711, thereby adjusting the radial position of the correction roller shaft 73 in the borehole. The operation of the adjustment component 8 drives the correction roller shaft frame 72 to move along the slot 711 of the sleeve 71. The correction roller shaft frame 72 drives the correction roller shaft 73 to move synchronously, changing the radial position of the correction roller shaft 73 in the borehole to adapt to different types of downstream sleeves 2. The adjustment component 8 can synchronously adjust the radial position of each correction roller shaft 73 to adapt to downstream sleeves 2 with different pipe diameters, expanding the adaptability range of the overall device, ensuring that sleeves of different pipe diameters are always in the center of the borehole, and preventing the sleeve from deflecting and getting stuck during the descent process.

[0045] like Figure 9 and Figure 10As shown, the adjusting assembly 8 includes a lead screw 81, a splined rod 82, and a splined wheel 83. One end of a lead screw 81 is rotatably connected to the outer side of each correction roller shaft bracket 72. The outer periphery of each lead screw 81 is threaded into a sleeve 71. A splined rod 82 is mounted on the other end of each lead screw 81. The inner ring of a splined wheel 83 is slidably connected to the outer periphery of each splined rod 82. The adjusting assembly 8 also includes a first helical gear 84 and a second helical gear 85. A first helical gear 84 is sleeved around the outer periphery of each splined wheel 83. Multiple first helical gears 84 mesh with second helical gears 85. The second helical gears 85 are rotatably disposed within the housing 5. The adjusting assembly 8 also includes a first gear 86, a second gear 87, a shaft 88, and a handwheel 89. A first gear 86 is fixedly sleeved around the outer periphery of the first helical gear 84. Both the first gear 86 and the second gear 87 are rotatably disposed within the housing 5, with the outer periphery of the first gear 86 meshing with the outer periphery of the second gear 87. The middle portion of the second gear 87 is coaxially connected... A handwheel 89 is installed at one end of the shaft 88 and the other end of the shaft 88. The shaft 88 is rotatably connected to the upper end of the housing 5. When it is necessary to adapt to sleeves of different diameters, rotating the handwheel 89 drives the shaft 88 to rotate. The shaft 88 drives the second gear 87 to rotate. The second gear 87 drives the first gear 86 to rotate. The first gear 86 drives the first helical gear 84 to rotate. The first helical gear 84 drives the second helical gear 85 to rotate synchronously. The second helical gear 85 drives multiple splined wheels 83 to rotate synchronously. The splined wheels 83 drive the splined rod 82 to rotate. The splined rod 82 drives the lead screw 81 to rotate. The lead screw 81 and the sleeve 71 are threaded together to push the correction roller shaft frame 72 to move along the groove 711, realizing the synchronous adjustment of the radial position of multiple correction roller shafts 73. The synchronous radial adjustment of multiple correction roller shafts 73 is achieved by the handwheel 89 in conjunction with multi-stage gear transmission, ensuring that multiple correction roller shafts 73 can move synchronously and equidistantly. The adjustment process is smooth and convenient, and it can adapt to the correction of sleeves of different specifications.

[0046] like Figure 11 As shown, a snap-fit ​​sleeve 51 is provided at the lower end of the housing 5. The snap-fit ​​sleeve 51 can be inserted into the borehole. The snap-fit ​​sleeve 51 at the lower end of the housing 5 is directly inserted into the borehole. The snap-fit ​​sleeve 51 forms a positioning fit with the inner wall of the borehole, fixing the housing 5 as a whole at the upper opening position of the borehole. This maintains the coaxial state of the casing channel inside the housing 5 and the borehole. The snap-fit ​​sleeve 51 can improve the connection stability between the housing 5 and the borehole, avoid the housing 5 from shifting or shaking during docking and correction, and improve the positioning accuracy of casing docking and casing lowering. In addition, the lower end of the housing 5 is fixed on the foundation. In this embodiment, the foundation is the ground at the borehole opening or the construction platform. By fixing the lower end of the housing 5 on the ground, the entire device is fixed on the ground.

[0047] The working process of a drilling casing positioning and correction structure:

[0048] 1. Device positioning

[0049] The snap-fit ​​sleeve 51 at the lower end of the fixed housing 5 is inserted into the borehole, and the lower end of the housing 5 is fixed on the ground at the upper end of the borehole, so that the inner sleeve channel of the housing 5 is kept coaxial with the borehole.

[0050] 2. Correction dimension adjustment

[0051] According to the diameter of the sleeve, turn the handwheel 89 to drive the shaft 88 and the second gear 87 to rotate. The second gear 87 drives the first gear 86, the first helical gear 84 and the second helical gear 85 to rotate. The second helical gear 85 drives multiple splined wheels 83 and splined rod 82 to rotate synchronously. The screw 81 rotates to push the correction roller shaft frame 72 to move along the groove 711, and synchronously adjusts the radial position of each correction roller shaft 73 to adapt to sleeves of different diameters. At this time, a sleeve is hoisted and placed into the correction assembly.

[0052] 3. Casing lowering and correction

[0053] When the downstream sleeve 2 moves downward, its outer wall rolls into contact with the correction roller shaft 73. Multiple correction roller shafts 73 with the same radial position restrict the movement path of the downstream sleeve 2, keeping the sleeve centered as it descends.

[0054] 4. Downstream casing fixing

[0055] The second hydraulic cylinder 63 pushes the fixing block 62 to move towards the center along the through hole 611 of the support ring 61. The inner side of the fixing block 62 presses against the outer wall of the downstream sleeve 2, and stably locks the downstream sleeve 2 inside the housing 5 to prevent rotation or movement during docking.

[0056] 5. Upstream casing clamping and positioning

[0057] The upstream sleeve 1 is hoisted onto the upper end of the downstream sleeve 2. The first hydraulic cylinder 43 pushes the slider 42 to slide along the support block 41. The slider 42 drives the tightening assembly 3 to approach the upstream sleeve 1. The roller 32 presses against the outer wall of the upstream sleeve 1 to limit the swaying of the upstream sleeve 1 and ensure that the upstream sleeve 1 and the downstream sleeve 2 are aligned.

[0058] 6. Tighten and connect the sleeves.

[0059] The rotating motor 331 operates, driving the roller shaft 32 to rotate via the synchronous belt 333 and synchronous pulley 332. The roller shaft 32 drives the upstream sleeve 1 to rotate through rolling friction. While rotating, the upstream sleeve 1 slowly descends, and the threaded end screws into the upper end of the downstream sleeve 2 to complete the docking. During the screwing process, the upstream sleeve 1 moves downward, and the mounting bracket 31 moves downward accordingly. The slider 42 slides in the slide groove 311 and compresses the hydraulic rod 44. The hydraulic rod 44 provides flexible buffering, so that the tightening assembly 3 adapts to the movement path of the sleeve. After docking is completed, the hydraulic rod 44 pushes the tightening assembly 3 to reset.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning and correction structure for drilling casing, characterized in that: The device includes a housing (5) and a correction assembly (7) inside it. The housing (5) is set above the borehole. The correction assembly (7) includes a sleeve (71), a correction roller frame (72) and a correction roller (73). The sleeve (71) is set inside the housing (5). The inner ring of the sleeve (71) is provided with multiple slots (711) along the circumferential direction. Each slot (711) is slidably connected to the outer periphery of a correction roller frame (72). Each correction roller frame (72) is rotatably set inside a correction roller (73). The outer periphery of each correction roller (73) can be slidably connected to the outer periphery of the downstream sleeve (2). The radial position of each correction roller (73) in the borehole is the same. The correction assembly (7) can restrict the movement path of the downstream sleeve (2).

2. The positioning and correction structure for drilling casing according to claim 1, characterized in that: An adjustment component (8) is also provided inside the housing (5). The adjustment component (8) is located below the correction component (7). The adjustment component (8) can adjust the position of each correction roller (73) in the corresponding slot (711).

3. The positioning and correction structure for drilling casing according to claim 2, characterized in that: The adjusting assembly (8) includes a lead screw (81), a spline rod (82) and a spline wheel (83). One end of a lead screw (81) is rotatably connected to the outer side of each correction roller frame (72). The outer periphery of each lead screw (81) is threadedly connected to the sleeve (71). A spline rod (82) is installed at the other end of each lead screw (81). The outer periphery of each spline rod (82) is slidably connected to the inner ring of a spline wheel (83).

4. The positioning and correction structure for drilling casing according to claim 3, characterized in that: The adjustment assembly (8) also includes a first helical gear (84) and a second helical gear (85). Each spline wheel (83) is fitted with a first helical gear (84), and the outer periphery of multiple first helical gears (84) meshes with the second helical gear (85). The second helical gear (85) is rotatably disposed inside the housing (5).

5. The positioning and correction structure for drilling casing according to claim 3, characterized in that: The adjustment assembly (8) also includes a first gear (86), a second gear (87), a shaft (88), and a handwheel (89). The first gear (86) is fixedly sleeved on the periphery of the first helical gear (84). The first gear (86) and the second gear (87) are both rotatably disposed in the housing (5), and the periphery of the first gear (86) meshes with the periphery of the second gear (87). The middle part of the second gear (87) is coaxially connected to one end of the shaft (88), and the other end of the shaft (88) is equipped with the handwheel (89). The periphery of the shaft (88) is rotatably connected to the upper end of the housing (5).

6. The positioning and correction structure for drilling casing according to claim 5, characterized in that: The lower end of the housing (5) is provided with a snap-fit ​​sleeve (51), which can be inserted into the drill hole, and the lower end of the housing (5) is fixed on the foundation.

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