Double clamp holder for drill rod installation

Abstract

The utility model relates to the technical field of coal mine drilling machines, in particular to a drill rod installation double clamp holder which comprises a rear clamp holder installation portion and a front clamp holder installation portion which are fixed on a machine frame, the rear clamp holder installation portion and the front clamp holder installation portion are provided with through holes for a drill rod to pass through, and the width of an opening of the side, away from the machine frame, of each through hole is matched with the diameter of a hole bottom motor and other large drilling tools. The front clamp holder mounting part is provided with an overturning hole, the swing body rotates with the through hole or the overturning hole as the axis, and the front clamp holder is mounted on the swing body. The swing body has two working conditions: in the swing working condition, the front clamp holder and the rear clamp holder can relatively rotate at a small angle to pre-loosen the drill rod joint; according to the overturning working condition, the swing body is integrally overturned, a large drilling tool such as a hole bottom motor is directly installed through the opening, the inclination angle of the clamping device does not need to be adjusted or integrally detached, the installation process is simplified, the construction time and manpower are saved, and the working efficiency is improved, meanwhile, by means of organic combination of the inner guide sleeve and the outer guide sleeve, the clamping device is matched with drill rods with two pipe diameters, and the drilling efficiency is improved. And the flow of replacing the guide sleeve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine drilling machines, in particular to a double clamp for installing a drill rod. Background Art

[0002] The clamp is an important part of the drilling rig, responsible for clamping the drill pipe, cooperating with the power head to connect or disconnect the drill pipe joint, and keeping the drill pipe from slipping. With the development of drilling technology, the supporting clamps of the drilling rig are also gradually evolving to meet the needs of the drilling rig to clamp and load and unload the drill pipe. Among them, the drill pipe loading and unloading technology of the directional drilling rig is particularly complicated, which requires loading and unloading ordinary drill pipes, as well as special drilling tools such as bottom hole motors. The outer diameters and lengths of various drilling tools are different. The double clamp is a derivative application of the conventional single clamp, which is often seen in automated drilling rigs. For example, the Chinese patent with application number 201710280043.3 discloses a new type of piston-to-top double clamp. The front and rear clamps have the function of relative rotation, which is used for connecting and unloading drill pipes, etc., to realize the automated operation of connecting and unloading drill pipes.

[0003] When the existing clamp is used in a directional drilling rig, some large drill tools have a much larger length or outer diameter than ordinary drill rods, making it difficult to directly place the large drill tools in the clamp. For example, the bottom hole motor, the core drill tool for directional drilling, has a much larger length and outer diameter than ordinary drill rods, and a power head is provided at the rear end of the drilling axis of the drilling rig. The distance between the power head and the clamp for installing and removing the drill rod is limited, making it impossible to install and remove the bottom hole motor from the rear end or middle of the frame, which is common for drilling rigs. The bottom hole motor can only be installed from the clamp, i.e., the front end of the frame, i.e., the bottom hole motor is inserted into the clamp from the front end of the frame. However, in order to ensure the accuracy of the left and right position and the up and down inclination of the borehole, it is necessary to determine the left and right position and the up and down inclination of the borehole axis through the inner hole axis of the clamp before installing the bottom hole motor. After determination, the distance from the front end of the clamp to the hole wall is very limited, making it difficult to directly install the bottom hole motor into the clamp.

[0004] There are generally two solutions for current construction sites:

[0005] The first method is to insert the bottom hole motor into the holder by tilting it at a certain angle relative to the axis of the inner hole of the holder (i.e. the drilling axis), but this method is very limited in scope. When the distance between the holder and the hole wall is small to a certain extent or the bottom hole motor is too long, the overly tilted bottom hole motor will not be able to align with the inner hole of the holder. At this time, the frame needs to be tilted as a whole to change the up and down inclination of the frame, so that the inclination of the inner hole of the holder is the same as that of the bottom hole motor. After installing the bottom hole motor in the holder, adjust the up and down inclination of the frame again.

[0006] The second method is to remove the entire clamp, install the bottom hole motor and send it into the hole, and then reinstall the clamp to adapt to the installation of other drill rods. This method has a wider range of applications and can also be used when the distance between the clamp and the hole wall is small.

[0007] However, the first method requires multiple adjustments to the up and down inclination angles of the inner hole axis of the clamp, and it is also necessary to install a bottom hole motor in a narrow operating space, which inevitably consumes a lot of manpower and construction time. The second method requires a lot of manpower and construction time for disassembly and installation due to the large size, heavy weight and complex structure of the clamp. Both methods will consume a lot of manpower and construction time, seriously affecting construction efficiency, and have huge safety hazards. Utility Model Content

[0008] The utility model aims to provide a double clamp for installing a drill rod, so as to simplify the installation process of a large-scale drilling tool, reduce manpower and construction time, and improve construction efficiency.

[0009] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a double clamp is installed on the drill rod, including a rear clamp installation part and a front clamp installation part fixedly arranged on a frame, the rear clamp installation part is provided with a rear clamp, the front clamp installation part is provided with a front clamp, the front clamp installation part and the rear clamp installation part are both provided with a through hole for the drill rod to pass through, the front clamp can rotate around the through hole, an opening is provided on the side of the through hole away from the frame to open the through hole, the opening width is greater than or equal to the diameter of the large drilling tool, a flipping part is provided on the side of the front clamp installation part, and the front clamp can flip around the flipping part and away from the opening of the front clamp installation part.

[0010] The beneficial effects of this solution are as follows: the swing body has two working conditions: swinging condition: under normal construction conditions, the swing body rotates with the through hole as the axis of rotation. At this time, a certain relative rotation can occur between the front clamp and the rear clamp, so that the drill rod in the front clamp and the drill rod in the rear clamp or the power head produce a small angle of relative rotation (such as pre-loosening the drill rod joint), completing the pre-loosening of the rotating rod; flipping condition: when large drilling tools such as bottom hole motors need to be installed, or when the swing body needs to be removed as a whole, the swing body needs to be flipped out of the front clamp installation part as a whole for operation. At this time, the hole axis is flipped The line is the rotation axis. When the swing body flips out of the front clamp mounting part, since the through holes of the front clamp mounting part and the rear clamp mounting part are both provided with openings, the through holes away from the frame side are in an open state. The axis of large drilling tools such as bottom hole motors can be directly placed in parallel with the drilling axis through the opening to complete the installation of large drilling tools such as bottom hole motors. There is no need to adjust the up and down inclination angles of the axis of the inner hole of the clamp for multiple times as in the first solution, nor is there any need to dismantle the clamp as a whole as in the second solution, which consumes a lot of manpower and construction time. The installation process is simple and fast.

[0011] Furthermore, a reinforcing plate is included, and the reinforcing plate is detachably connected to the top opening of the front clamp.

[0012] Beneficial effect: The design of the reinforcement plate effectively reduces the reduction in structural strength of the front support plate and the rear support plate caused by the single-sided opening. At the same time, the connection method is designed to be detachable, and the reinforcement plate can also be removed when installing large drilling tools such as bottom hole motors or performing maintenance, so as to avoid the reinforcement plate affecting the installation of large drilling tools such as bottom hole motors or the maintenance of drill rods.

[0013] Furthermore, the front clamp and the rear clamp both include a clamping cylinder and a cava, the clamping cylinder includes an output shaft, the cava includes an outer cava and an inner cava, the outer cava is fixedly connected to the output shaft to form a moving pair under the drive of the output shaft, and the inner cava is detachably connected to the outer cava.

[0014] Beneficial effect: When replacing the inner slip, the clamping cylinder retracts to form an open space for disassembling and installing the slip. The slip can be quickly replaced by removing and installing a few screws, which is convenient and quick to operate. In addition, the inner slip uses a larger plane to achieve positioning along the axial direction of the clamp, and uses screws to achieve positioning along the radial direction of the arc. The plane bears the shear force for the screw, which greatly reduces the possibility of deformation of the screw under stress and improves the reliability of positioning.

[0015] Furthermore, the front projection of the inner cava is a "cross" shape, the main body of the cross-section of the middle section of the inner cava is an arc shape, and bosses are symmetrically provided on the upper and lower sides. The side of the boss facing the center of the through hole is provided with a countersunk through hole for installing screws connecting the outer cava and the inner cava; the inner surface of the outer cava is provided with a rectangular plane for matching with the boss of the inner cava, and the rectangular plane is provided with a threaded hole matched with the countersunk through hole provided with the boss, and two clamping blocks are vertically provided on both sides of the rectangular plane, and the surfaces of the clamping blocks close to the rectangular plane form four stop surfaces; the clamping blocks on the same side extend to each other to form two arc surfaces, and the diameter of the arc surface matches the larger drill pipe diameter and the outer diameter of the inner cava; the arc surface and the four stop surfaces are combined to form an installation space for the inner cava.

[0016] Furthermore, the front clamp also includes a swinging body, the clamping cylinder is fixedly arranged on the swinging body, and the swinging body can rotate around the through hole or flip around the flipping part; it also includes a guide sleeve assembly, the guide sleeve assembly includes a front clamping guide sleeve, the front clamping guide sleeve includes two groups of guide sleeves, the swinging body includes a swinging support plate symmetrically arranged front and back, the swinging support plate is provided with mounting through holes, the guide sleeves are detachably connected to the swinging support plate, each group of guide sleeves includes an inner guide sleeve and an outer guide sleeve, the outer diameters of the inner guide sleeve and the outer guide sleeve are divided into two levels: a small diameter section and a large diameter section, the large diameter section is detachably connected to the mounting through hole, and the small diameter section of the outer guide sleeve can be sleeved in the small diameter section of the inner guide sleeve; the small diameter section of the inner guide sleeve is coaxial with the mounting through hole of the swinging support plate, and the large diameter section is coaxial with the through hole of the front clamp mounting part.

[0017] Beneficial effects: Integrating the guide sleeve onto the gripper can save installation space and make the overall layout of the drill rig more compact. The structures of the inner guide sleeve and the outer guide sleeve are significantly different, facilitating on-site fitting management and identification.

[0018] Furthermore, front gripper mounting positions are fixed on both sides of the swing support plate, and rear gripper mounting positions are fixedly arranged on both sides of the rear gripper mounting part; the clamping cylinder includes two cylinder barrels, which are symmetrically and fixedly installed on the front gripper mounting position and the rear gripper mounting position respectively, and the output shafts extend from both sides of the through hole towards the center and are fixedly connected to the outer slip.

[0019] Beneficial effects: When replacing the inner slip, the clamping cylinder retracts to form an open space for disassembling and assembling the slip. Only a few screws need to be removed and installed to quickly replace the slip, with convenient and fast operation. Moreover, the inner slip uses a larger plane to achieve axial positioning along the gripper, and screws are used to achieve radial positioning along the arc. The plane bears the shear force instead of the screws, greatly reducing the possibility of screw force deformation and improving the reliability of positioning.

[0020] Furthermore, the cross-section of the swing support plate is in a "U" shape.

[0021] Furthermore, a swing ear seat and a hinge shaft seat corresponding to the flipping hole are fixedly connected to the lower part of one side of the swing body. A driving part for driving the swing body to swing around the axis of the flipping hole is hinged to the swing ear seat; the driving part is a telescopic part, with one end hinged to the frame and the other end hinged to the swing ear seat.

[0022] Furthermore, the front gripper mounting part includes a front support plate and a rear support plate. First convex blocks are arranged on the open sides of the front support plate and the rear support plate, with the first convex blocks arranged on both sides of the opening to form a first groove; a second convex block corresponding to the opening is arranged in the middle of the reinforcing plate. The inner side of the second convex block is tangent to the cylinder where the through hole is located, and second grooves corresponding to the first convex blocks are arranged on both sides of the second convex block; the reinforcing plate is screwed to the top of the front support plate and the rear support plate.

[0023] Furthermore, it further includes a mounting plate. Both the rear gripper mounting part and the front gripper mounting part are fixedly arranged on the mounting plate, and the mounting plate is detachably connected to the frame.

[0024] 1. The swing body of the present application can mechanically swing out of the base by switching the rotation center. Combining with the detachable reinforcing plate structure of the base, a large amount of space inside and above the gripper is vacated, enabling the installation of large drilling tools such as downhole motors from top to bottom. This process only requires disassembling and assembling a small number of small parts, which not only reduces the space requirement for the installation of large drilling tools such as downhole motors at the front end of the gripper, but also saves a large amount of time and manpower for overall removal of the gripper, and ensures on-site safety.

[0025] 2. The present application can realize the switching of the applicable drill pipe outer diameter by quickly disassembling and assembling the inner cava and the outer guide sleeve, thereby improving the application range of the clamp, and is particularly suitable for situations where a directional drilling rig simultaneously uses ordinary drill pipes, salvage drill pipes, bottom hole motors and other large drilling tools and other special drilling tools.

[0026] 3. When replacing the inner slip, the clamping cylinder retracts to form an open space for disassembling and installing the slip. Only a few screws need to be removed and installed to quickly replace the slip, which is convenient and quick to operate. In addition, the inner slip adopts a larger plane to achieve positioning along the axial direction of the clamp, and adopts screws to achieve positioning along the radial direction of the arc. The plane bears shear force instead of the screw, which greatly reduces the possibility of deformation of the screw under stress and improves the reliability of positioning.

[0027] 4. Integrating the guide sleeve into the holder can save installation space and make the overall layout of the drilling rig more compact. The inner guide sleeve and the outer guide sleeve have obvious structural differences, which facilitates on-site accessory management and identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional diagram of an embodiment of the utility model;

[0029] Figure 2 This is a front view of an embodiment of the utility model;

[0030] Figure 3 for Figure 2 Section view at AA;

[0031] Figure 4 A three-dimensional diagram of the base of the utility model;

[0032] Figure 5 This is a three-dimensional diagram of the base of the utility model after removing the reinforcement plate;

[0033] Figure 6 It is a three-dimensional diagram of the swinging body of the utility model;

[0034] Figure 7 This is a three-dimensional diagram of the external slip of the utility model;

[0035] Figure 8 It is a three-dimensional diagram of the inner slip of the utility model;

[0036] Fig. 9 This is a three-dimensional diagram of the semi-ring guide sleeve of the utility model;

[0037] Fig.10 This is a three-dimensional diagram of the outer guide sleeve of the utility model;

[0038] Fig.11 It is a schematic diagram of the inner guide sleeve of the utility model. DETAILED DESCRIPTION

[0039] The following is further described in detail through specific implementation methods:

[0040] The figure marks in the drawings of the specification include: mounting plate 11, front clamp mounting part 12, front support plate 121, rear support plate 122, reinforcement plate 123, flip hole 124, flip plate 125, rear clamp mounting part 13, front side plate 131, rear side plate 132, rear lining plate 133, rear clamp mounting position 134, swing body 14, swing support plate 141, front clamp mounting position 142, front lining plate 143, swing ear seat 144, hinge shaft seat 145, front clamp 21, rear clamp 22, inner cava 23, boss 231, outer cava 24, rectangular plane 241, block 242, inner guide sleeve 251, outer guide sleeve 252, semi-ring guide sleeve 253, small diameter section 2501, large diameter section 2502, and driving member 26.

[0041] Example

[0042] The embodiment is basically as shown in the attached Figure 1-11 As shown, Figure 1-11 The drill rod installation double clamp shown includes a base, a swing unit, a guide sleeve assembly and a double clamp unit, as shown in FIG. Figure 4 As shown, the base is used to support the clamp, which is convenient for assembly and installation between the clamp and the drilling rig. The base includes a mounting plate 11, and a plurality of countersunk through holes for connecting with the frame are arranged on both sides of the mounting plate 11. A rear clamp mounting portion 13 and a front clamp mounting portion 12 are fixedly arranged on the mounting plate 11.

[0043] like Figure 5 As shown, the rear clamp mounting portion 13 includes a front side plate 131, a rear side plate 132 and a rear clamp mounting position 134, the middle parts of the front side plate 131 and the rear side plate 132 are provided with through holes, the tops of the front side plate 131 and the rear side plate 132 are provided with first openings, the first openings make the tops of the through holes provided on the front side plate 131 and the rear side plate 132 open and combined with the through holes to form a U-shaped groove, the front side plate 131 and the rear side plate 132 are welded in parallel to the mounting plate 11, four rear lining plates 133 are welded or bolted between the front side plate 131 and the rear side plate 132, the rear lining plates 133 are arranged on both sides of the U-shaped groove, and respectively form a cava sliding guide cavity with the inner walls of the front side plate 131 and the rear side plate 132, and the rear clamp mounting position 134 is fixed to the two ends of the front side plate 131 and the rear side plate 132 by bolts.

[0044] like Figure 4As shown in the figure, the front gripper mounting part 12 includes a front support plate 121, a rear support plate 122, and a reinforcing plate 123. A turning plate 125 is welded to the sides of the front support plate 121 and the rear support plate 122. A turning hole 124 is provided on the turning plate 125. The front support plate 121 and the rear support plate 122 are welded to the mounting plate 11 in parallel. The front support plate 121 and the rear support plate 122 are also provided with through holes coaxial with the rear gripper mounting part 13. The top ends of the front support plate 121 and the rear support plate 122 are provided with a second opening for opening the through hole. The width of the second opening is greater than or equal to the outer diameter of the hole bottom motor. First bumps and first grooves are provided on both sides of the second opening.

[0045] As Figure 4 shown in the figure, a second bump corresponding to the second opening is provided in the middle of the reinforcing plate 123. Second grooves corresponding to the first bumps are provided on both sides of the second bump. During installation, the second bump and the second grooves of the reinforcing plate 123 respectively correspond to the first grooves and the first bumps on the front support plate 121 and the rear support plate 122. A complete plane is formed through the interlacing and nesting of the first bumps, the second grooves, the second bumps, and the second grooves, which not only improves the structural strength of the support plate but also facilitates the installation of the reinforcing plate 123.

[0046] The swinging unit includes a swinging body 14, a driving member 26, and a pin shaft. As Figure 6 shown in the figure, the swinging body 14 includes a swinging support plate 141. An installation through hole is provided on the side wall of the swinging support plate 141. The cross-section of the swinging support plate 141 is in a "U" shape. Four front lining plates 143 are welded or bolted to the middle of the swinging support plate 141. The front lining plates 143 and the swinging support plate 141 jointly form. Front gripper mounting positions 142 are bolted to the left and right sides of the swinging support plate 141. A swinging ear seat 144 and a hinge shaft seat 145 are welded to the lower part on the right side. The driving member 26 is a telescopic member such as a cylinder or an oil cylinder. In this embodiment, it is an oil cylinder. The oil cylinder includes a cylinder body and an output shaft. The cylinder body is hinged to the frame, and the output shaft is hinged to the swinging ear seat 144. Thus, through the expansion and contraction of the output shaft of the driving member 26, the swinging body 14 is driven to rotate around the installation through hole or rotate around the hinge shaft seat 145. The pin shaft is adapted to the hinge shaft seat 145. During the swinging working condition, the pin shaft is not connected to the hinge shaft seat 145.

[0047] The guide sleeve assembly includes a rear gripper guide sleeve and a front gripper guide sleeve. The rear gripper guide sleeve and the front gripper guide sleeve are both coaxial with the through hole. The rear gripper guide sleeve is a semi-circular guide sleeve 253 as Fig. 9 shown in the figure. The outer diameter of the semi-circular guide sleeve 253 is divided into two levels: a small diameter section 2501 and a large diameter section 2502. The outer diameter of the small diameter section 2501 is less than or equal to the inner diameter of the through hole of the rear gripper mounting part 13. A countersunk through hole is provided on the end face of the large diameter section 2502, and it is screwed to the rear side plate 132 through the countersunk through hole. After the installation is completed, the notch direction of the semi-circular guide sleeve 253 is the same as the opening direction of the first opening.

[0048] The front clamp guide sleeve includes two sets of guide sleeves, each set of guide sleeves includes an inner guide sleeve 251 and an outer guide sleeve 252. Fig.10 , Fig.11 As shown, the outer diameters of the inner guide sleeve 251 and the outer guide sleeve 252 are divided into two stages: a small diameter section 2501 and a large diameter section 2502. The small diameter section 2501 is provided with a through hole coaxial with the inner guide sleeve 251 and the outer guide sleeve 252. Figure 3 As shown, the outer diameter of the small diameter section 2501 of the outer guide sleeve 252 is less than or equal to the inner diameter of the small diameter section 2501 of the inner guide sleeve 251; the small diameter section 2501 of the inner guide sleeve 251 is adapted to the mounting through hole set on the swing support plate 141, and the large diameter section 2502 is adapted to the through hole of the front support plate 121; a countersunk through hole is provided on the end face of the large diameter section 2502 for installing screws. During installation, the large diameter section 2502 is fixed to the swing support plate 141 by passing the screw through the countersunk through hole, thereby realizing the axial limitation of the swing body 14.

[0049] An inner guide sleeve 251 and an outer guide sleeve 252 are provided at both the front and rear ends of the front clamp 21. When the drill rod enters or exits the clamp, the guide sleeve limits the deviation of the drill rod in the circumferential direction, ensuring that the drill rod is always within the range that can be clamped by the clamp, while protecting the clamp and the drilling rig power head from damage caused by excessive deviation of the drill rod. Since the rear clamp 22 is closer to the power head, the drill rod is less deviated by the active drill rod of the power head, so the rear clamp 22 only needs a semi-ring guide sleeve 253 to adapt to drill rods of different outer diameters.

[0050] When the outer guide sleeve 252 and the inner guide sleeve 251 are installed at the same time, the clamp is suitable for drill rods with smaller outer diameters (generally having a specific outer diameter value for a specific drilling rig); when the outer guide sleeve 252 is removed and only the inner guide sleeve 251 is used, it is suitable for drill rods with larger outer diameters.

[0051] At the same time, the inner diameter of the outer slip 24 matches the outer diameter of the larger drill pipe that the clamp is suitable for, the outer diameter of the inner slip 23 is the same as the outer diameter of the larger drill pipe, and the inner diameter of the inner slip 23 matches the outer diameter of the smaller drill pipe that the clamp is suitable for. Combined with the quick disassembly and assembly method of the inner slip 23, the clamp of the present application can be applied to drill pipes of two outer diameters during construction, but when the pin is connected to the articulated shaft seat 145, that is, when the working condition is turned over, the inner guide sleeve 251 and the outer guide sleeve 252 need to be completely removed.

[0052] When in use, you can choose to use the guide sleeve assembly at the same time or remove the outer guide sleeve 252 according to the size of the rotating rod diameter, or remove both the inner guide sleeve 251 and the outer guide sleeve 252, and pass the pin shaft through the flip hole 124 to connect with the hinge shaft seat 145, so that the connection between the swing body 14 and the front clamp mounting part 12 is transformed into a connection mode for the flipping working condition, so that the front clamp 21 is flipped out of the base through the swing body 14 to adapt to the guiding work of small-diameter drill rods, the guiding work of large-diameter drill rods and the installation work of the bottom hole motor respectively.

[0053] The double clamping unit includes a rear clamp 22 and a front clamp 21, and the rear clamp 22 and the front clamp 21 both include slips and a clamping cylinder, and the slips include an inner slip 23 and an outer slip 24. Figure 7 , Figure 8 As shown, the inner sides of the inner slip 23 and the outer slip 24 are provided with bumps or tiny sharp teeth, so as to increase the friction coefficient of the inner sides of the inner slip 23 and the outer slip 24 and reduce the probability of the drill pipe slipping.

[0054] like Figure 8 As shown, the front projection of the inner cava 23 is a "cross" shape, the middle section cross section of the inner cava 23 is an arc shape, and bosses 231 are symmetrically provided on the upper and lower sides. The side of the boss 231 facing the center of the through hole is provided with a countersunk through hole for installing screws connecting the outer cava 24 and the inner cava 23; Figure 7 As shown, a rectangular plane 241 is provided on the inner surface of the outer cava 24, and a threaded hole is provided on the rectangular plane 241. Two clamping blocks 242 are vertically provided on both sides of the rectangular plane 241. The surfaces of the clamping blocks 242 and the rectangular plane 241 close to each other form four stop surfaces, and extend mutually through the clamping blocks 242 on the same side to form two arc surfaces. The diameter of the arc surface matches the larger drill pipe diameter and the outer diameter of the inner cava 23; the arc surface and the four stop surfaces are combined to form an installation space for the inner cava 23.

[0055] The front projection of the inner slip 23 is a "cross" shape, and four positioning planes are symmetrically arranged on the left and right sides, which cooperate with the four stop planes corresponding to the outer slip 24 to realize the positioning of the inner slip 23 along the front and rear axial direction of the clamp. The positioning of the inner slip 23 in the radial direction of the arc (i.e. the extension and contraction direction of the clamping cylinder) is realized by the screws connected to the outer slip 24.

[0056] This positioning method makes good use of the advantage of high tensile strength of threaded connection, while avoiding its weak shear strength, greatly reducing the possibility of deformation of the slip positioning parts.

[0057] When the inner slip 23 is seriously worn or needs to be replaced from a drill rod with a smaller outer diameter to a drill rod with a larger outer diameter, the inner slip 23 needs to be disassembled. Simply retract the clamping cylinder and unscrew the connecting screws between the inner slip 23 and the outer slip 24 to disassemble the inner slip 23. When a drill rod with a larger diameter needs to be adapted, the inner slip 24 and the outer guide sleeve 252 need to be removed simultaneously so that the front clamp guide sleeve can be adapted to the drill rod. The installation steps are the opposite.

[0058] The clamping cylinder includes two cylinder barrels and corresponding piston rods. The two cylinder barrels are respectively connected to the rear clamp mounting position 134 and the front clamp mounting position 142 by bolts. The piston rod extends toward the center from both sides of the clamp. The piston rod is welded with an output shaft, and the output shaft is bolted to the external cava 24, so that the clamping and loosening of the cava can be achieved through the reciprocating movement of the piston rod.

[0059] Specific implementation process:

[0060] Under normal construction conditions, the front clamp 21 is not installed with a flip pin and related pin fixing parts, and takes the inner guide sleeve 251 as the central axis to achieve reciprocating swing within a smaller angle range under the drive of the driving member 26.

[0061] When the turning body needs to be turned out of the base as a whole through the driving member 26 , the pin is inserted into the hinge shaft seat 145 through the turning hole 124 , and the reinforcement plate and the front clamp guide sleeve are removed, so that the turning body rotates around the turning hole 124 .

[0062] Working principle:

[0063] Under normal construction conditions, it is sometimes necessary to rotate the drill rod in the front clamp 21 relative to the rear clamp 22 or the power head at a small angle, such as pre-loosening the drill rod joint. However, the power head rotates at a high speed and it is difficult to control the rotation angle. In this case, the front clamp 21 is not equipped with a flip pin, and the inner guide sleeve 251 is used as the central axis to achieve reciprocating swing within a small angle range under the drive of the drive member 26. Figure 2 When the piston rod of the driving member 26 is extended, the left end of the front clamp 21 is lowered and the right end is raised; when the piston rod of the driving member 26 is retracted, the left end of the front clamp 21 is raised and the right end is lowered.

[0064] When the bottom hole motor needs to be installed, or when the swing body 14 needs to be removed as a whole, the swing body 14 needs to be flipped out of the base as a whole for operation. The flipping process is as follows: install the flip pin and related pin fixing parts to connect the base and the swing body 14; remove all the outer guide sleeves 252 and inner guide sleeves 251 at the front and rear ends of the front clamp 21; at this time, the central axis of rotation of the front clamp 21 is switched to the flip pin, and the front clamp 21 can be driven by the driving member 26 to rotate around the pin in the flip hole 124; the corresponding relationship between the extension and rotation directions of the driving member 26 is the same as the swinging working condition.

[0065] According to the lever principle, since the rotation fulcrum moves toward the driving member 26, when the piston rod of the driving member 26 retracts, under this condition Figure 2 The left end of the front clamp 21 shown in the figure rotates more than in normal construction, and the swing body 14 can be turned clockwise over the center of the base to expose the base almost completely. At this time, the reinforcing plate 123 on the front and rear support plates 122 of the base is removed, and a very spacious space is formed inside and on the top of the front clamp 21, so that the bottom hole motor can be directly placed from top to bottom.

[0066] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that the technical means for solving the problems in the above-mentioned embodiments of the utility model can be used in combination to solve multiple technical problems at the same time. For those skilled in the art, several deformations and improvements can be made without departing from the technical solution of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A double clamp for mounting a drill rod, comprising a rear clamp mounting part and a front clamp mounting part fixedly mounted on a frame, the rear clamp mounting part is provided with a rear clamp, the front clamp mounting part is provided with a front clamp, both the front clamp mounting part and the rear clamp mounting part are provided with a through hole for the drill rod to pass through, the front clamp can rotate around the through hole, and the characteristics are: An opening for opening the through hole is provided on the side away from the frame. The width of the opening is greater than or equal to the diameter of the large drill tool. A flipping part is provided on the side of the front gripper mounting part. The front gripper can flip around the flipping part and move away from the opening of the front gripper mounting part.

2. The double clamp for mounting a drill rod according to claim 1, characterized in that: It further includes a reinforcing plate, and the reinforcing plate is detachably connected to the opening at the top of the front gripper.

3. The double clamp for mounting a drill rod according to claim 2, characterized in that: Both the front gripper and the rear gripper include a clamping oil cylinder and a slip. The clamping oil cylinder includes an output shaft. The slip includes an outer slip and an inner slip. The outer slip is fixedly connected to the output shaft and forms a moving pair under the drive of the output shaft. The inner slip is detachably connected to the outer slip.

4. The double clamp for mounting a drill rod according to claim 3, characterized in that: The front projection of the inner slip is in a "cross" shape. The main body of the cross-section of the middle section of the inner slip is arc-shaped. Convex platforms are symmetrically provided on the upper and lower sides. A countersunk through hole for installing and connecting the screws of the outer slip and the inner slip is provided on the surface of the convex platform facing the center of the through hole. A rectangular plane for fitting with the convex platform of the inner slip is provided on the inner surface of the outer slip. Threaded holes adapted to the countersunk through holes provided on the convex platform are provided on the rectangular plane. Two blocks are vertically provided on each side of the rectangular plane. The surfaces of the blocks close to the rectangular plane form four stopping surfaces. The blocks on the same side extend towards each other to form two arc surfaces. The diameter of the arc surfaces matches the diameter of the larger drill pipe and the outer diameter of the inner slip. The combination of the arc surfaces and the four stopping surfaces forms an installation space for the inner slip.

5. The double clamp for mounting a drill rod according to claim 4, characterized in that: The front gripper further includes a swinging body. The clamping oil cylinder is fixedly arranged on the swinging body. The swinging body can rotate around the through hole or flip around the flipping part. It further includes a guide sleeve assembly. The guide sleeve assembly includes a front gripper guide sleeve. The front gripper guide sleeve includes two groups of guide sleeves. The swinging body includes swinging support plates symmetrically arranged front and rear. Mounting through holes are provided on the swinging support plates. The guide sleeves are respectively detachably connected to the swinging support plates. Each group of guide sleeves includes an inner guide sleeve and an outer guide sleeve. The outer diameters of the inner guide sleeve and the outer guide sleeve are divided into two levels of a small diameter section and a large diameter section. The large diameter section is detachably connected to the mounting through hole. The small diameter section of the outer guide sleeve can be sleeved inside the small diameter section of the inner guide sleeve. The small diameter section of the inner guide sleeve is coaxial with the mounting through hole of the swinging support plate, and the large diameter section is coaxial with the through hole of the front gripper mounting part.

6. The double clamp for mounting a drill rod according to claim 5, characterized in that: Front gripper mounting positions are fixed on both sides of the swinging support plate. Rear gripper mounting positions are fixedly arranged on both sides of the rear gripper mounting part. The clamping oil cylinder includes two cylinder barrels. The cylinder barrels are respectively symmetrically fixedly installed on the front gripper mounting position and the rear gripper mounting position. The output shaft extends from both sides of the through hole towards the center and is fixedly connected to the outer slip.

7. The double clamp for mounting a drill rod according to claim 6, characterized in that: The cross-section of the swinging support plate is in a "U" shape.

8. The double clamp for mounting a drill rod according to claim 7, characterized in that: A swinging ear seat and a hinge shaft seat corresponding to the flipping hole are fixedly connected to the lower part of one side of the swinging body. A driving part for driving the swinging body to swing around the axis of the flipping hole is hinged to the swinging ear seat. The driving part is a telescopic part. One end of the driving part is hinged to the frame, and the other end is hinged to the swinging ear seat.

9. The double clamp for mounting a drill rod according to claim 2, characterized in that: The front gripper mounting part includes a front support plate and a rear support plate. First convex blocks are provided on the opening sides of the front support plate and the rear support plate. The first convex blocks are provided on both sides of the opening to form a first groove. A second convex block corresponding to the opening is provided in the middle of the reinforcing plate. The inner side surface of the second convex block is tangent to the cylinder where the through hole is located. Second grooves corresponding to the first convex blocks are provided on both sides of the second convex block. The reinforcing plate is screwed to the tops of the front support plate and the rear support plate.

10. The drill rod mounting double clamp according to any one of claims 1 to 8, characterized in that: It also includes a mounting plate, on which the rear clamp mounting part and the front clamp mounting part are both fixedly arranged, and the mounting plate is detachably connected to the frame.

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