A gas-tight oil pipe connection structure

Abstract

The present invention relates to the technical field of oil pipe connection, and in particular to an airtight oil pipe connection structure, comprising a coupling and an oil pipe body suitable for connection to the axial end of the coupling, wherein the axial end of the coupling is provided with a tapered thread groove, and the outer peripheral wall of the axial end of the oil pipe body is provided with a tapered external thread, and the tapered external thread of the oil pipe body is threadedly connected with the tapered thread groove of the corresponding axial end of the coupling, and further comprising a connection device, wherein the connection device comprises two claws driven to move toward each other to clamp the coupling or move backward to loosen the coupling, and the outer walls of the two claws are fixed with support blocks, and the two support blocks are respectively a first support block and a second support block. The thread alignment of the coupling and the oil pipe body is realized, the connection accuracy is improved, the stability and reliability of the connection are enhanced, the loosening caused by thread misalignment, and even the risk of leakage caused by damage to the thread is reduced, and the connection effect of the airtight oil pipe is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe connection, in particular to an airtight oil pipe connection structure. Background Art

[0002] Oil pipes are special oil pipes that are used in large quantities in oil and gas field exploitation. They are used to withstand the pressure generated during the exploitation process. With the development of deep wells, ultra-deep wells, high-pressure gas wells, etc., the load on the oil pipe string has increased significantly. At the same time, the high temperature environment has reduced the bearing capacity of the oil pipe. The connection performance of the oil pipe joint is the most critical factor to ensure the oil pipe;

[0003] After searching, a Chinese patent with announcement number CN201288903Y discloses a threaded connection joint for oil casing with a negative bearing surface angle, which includes a coupling and a casing threadedly connected to both ends of the coupling. In this structure, the coupling and the casing are connected by threads. When connecting, the centering of the thread is very important. If the centering accuracy is poor, it will cause deviation in thread screwing or even misalignment, resulting in sealing failure after use, reducing the stability of the connection, increasing the risk of connection failure and subsequent leakage, and is not conducive to the connection and use of airtight oil pipes. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an airtight oil pipe connection structure, which improves the connection accuracy, enhances the stability and reliability of the connection through excellent thread centering measures, reduces damage to the threads at the connection, reduces the risk of loosening or leakage due to thread misalignment, improves the connection effect, achieves reliable connection, and reduces the safety risks caused by loose connection or oil leakage.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an airtight oil pipe connection structure, comprising a coupling and an oil pipe body suitable for connecting to the axial end of the coupling, wherein the axial end of the coupling is provided with a tapered thread groove, and the outer peripheral wall of the axial end of the oil pipe body is provided with a tapered external thread, and the tapered external thread of the oil pipe body is threadedly connected with the tapered thread groove of the corresponding axial end of the coupling;

[0006] The cam is an angular channel that is adapted to move the two ends of the cam and to move the two ends of the cam into a circular motion, the two ends of the cam being adapted to move the two ends of the cam in a circular motion.

[0007] Preferably, a second arc block is fixedly provided on the top surface of the second support block, and the first arc block and the second arc block are suitable for docking through a docking device when the two claws move toward each other, and the docking device includes two plug rods connected at both ends of the first arc block and two sockets arranged at both ends of the second arc block, and the sockets are respectively plugged into and matched with the corresponding plug rods.

[0008] Through the above technical solution, the insertion hole on the second arc block is plugged into the insertion rod, thereby increasing the connection strength.

[0009] Preferably, the centering assembly comprises a fixed block, and the first supporting block is provided with a semicircular block below the first arc-shaped block, and the top surfaces at both ends of the semicircular block are respectively connected to the bottom surfaces of the corresponding brackets.

[0010] Through the above technical solution, when the first support block and the second support block are close to each other, the insertion hole of the second arc block is plugged into and matched with the corresponding insertion rod, and as the first arc block moves, the two brackets and the semicircular block move to a suitable position.

[0011] Preferably, the two clamping claws are suitable for being driven to move toward or away from each other by a clamping claw driving mechanism, and the clamping claw driving mechanism comprises a mounting frame, a limiting slot is provided on the mounting frame, the two clamping claws are respectively located inside the limiting slots, a bidirectional lead screw is rotatably connected inside the limiting slots, an outer end of one of the clamping claws is threadedly connected to a forward-rotating thread segment of the bidirectional lead screw through a threaded hole, and an outer end of the other clamping claw is threadedly connected to a reverse-rotating thread segment of the bidirectional lead screw through a threaded hole, a first servo motor is installed on the mounting frame through a mounting seat, and an output shaft of the first servo motor is coaxially connected to the bidirectional lead screw;

[0012] A sealing ring is arranged inside the coupling near the axial edge, and the inner wall of the sealing ring is in frictional contact with the outer peripheral wall of the oil pipe body.

[0013] Through the above technical solution, the output shaft of the first servo motor drives the bidirectional lead screw to rotate synchronously, and the bidirectional lead screw pushes the two claws to slide along the limit groove, so that the claws approach each other, and the claws clamp and fix the butt clamp.

[0014] Preferably, the centering component also includes a fixed block, a first hydraulic cylinder is installed on the fixed block through a mounting seat, a push block is fixedly provided on the piston rod of the first hydraulic cylinder, a positioning pin is fixedly provided on the push block, a plurality of positioning grooves are formed on the outer wall of the bracket in a uniformly arranged structure, the positioning pin is slidably connected to the slider, and the positioning pin is suitable for being plugged into and matched with the positioning groove after being pushed.

[0015] Through the above technical solution, the piston rod of the first hydraulic cylinder pulls the push block to drive the positioning pin to engage with the positioning groove.

[0016] Preferably, a second servo motor is mounted on the top surface of the first arc block via a mounting seat, a screw is coaxially connected to the output shaft of the second servo motor, the screw is rotatably connected to the bracket, and the connecting block is threadedly connected to the screw via a threaded hole.

[0017] Through the above technical solution, the output shaft of the second servo motor drives the screw to rotate to move the connecting block and the slider along the bracket toward the claw, driving the clamped oil pipe body to descend synchronously.

[0018] Preferably, the clamping assembly includes two clamping plates slidably arranged on a U-shaped frame, the inner walls of the clamping plates are rotatably connected to a plurality of rotating columns, the side walls of the slider are installed with a second hydraulic cylinder corresponding to the clamping plates through a mounting seat, the piston rod of the second hydraulic cylinder passes through the U-shaped frame, and the piston rod of the second hydraulic cylinder is fixedly connected to the corresponding clamping plates.

[0019] Preferably, two positioning rods are fixedly provided on the outer wall of the clamping plate, and the positioning rods penetrate the U-shaped frame and extend to the outside, and the positioning rods are slidably connected to the U-shaped frame.

[0020] Through the above technical solution, the clamping plate is pushed to move toward the middle by the piston rod of the second hydraulic cylinder, so that the clamping plate drives the rotating column to abut against the outer wall of the oil pipe body.

[0021] Preferably, a lubrication assembly is provided on the second support block, and the lubrication assembly includes a lifting block, and the lifting block is slidably mounted on the second support block; the lubrication assembly also includes a first piston cylinder, and the first piston cylinder is mounted on the second support block through a mounting seat, and the top surface of the piston rod of the first piston cylinder is fixedly connected to the bottom surface of the lifting block, and a hollow metal tube is slidably inserted on the lifting block, and a second piston cylinder is mounted on the side wall of the lifting block through a mounting seat, and a connecting rod is fixedly provided at the outer end of the hollow metal tube, and the piston rod of the second piston cylinder is fixedly connected to the connecting rod; the outer end of the hollow metal tube is connected to a dust suction fan, and the outer peripheral wall of the inner end of the hollow metal tube is fixedly provided with a dust suction box, and the interior of the dust suction box is connected to the hollow metal tube.

[0022] Through the above technical solution, the piston rod of the second piston cylinder pushes the connecting rod to move, and the connecting rod drives the hollow metal tube to slide on the lifting block, so that the hollow metal tube drives the dust box to move to cooperate with the tapered external thread of the oil pipe body; the cleaned dust is transported to the air outlet end through the hollow metal tube by the dust suction fan. At this time, a dust collecting bag is installed on the air outlet end of the dust suction fan, and the collected and cleaned dust is collected by the dust collecting bag.

[0023] Preferably, a cleaning roller is rotatably connected inside the dust box, a third servo motor is installed on the top surface of the dust box through a mounting seat, the output shaft of the third servo motor is coaxially connected to the cleaning roller, a scraping block is fixedly provided on the inner side wall of the dust box, a distribution block is fixedly provided on the side wall of the dust box, a plurality of nozzles are connected to the inner side wall of the distribution block, a delivery hose is connected to the distribution block, an oil pump is connected to the delivery hose, a liquid inlet pipe is connected to the liquid inlet end of the oil pump, and the oil pump is installed on the top surface of the lifting block through a mounting seat.

[0024] Through the above technical scheme, the cleaning roller is driven to rotate by the output shaft of the third servo motor, so that the cleaning roller contacts the tapered external thread of the oil pipe body, and dust and impurities on the outer surface of the tapered external thread of the oil pipe body are cleaned. The thread lubricating oil is sucked by the oil pump and transported to the inside of the distribution block through the delivery hose, and then sprayed to the outer surface of the tapered external thread of the oil pipe body after cleaning through the nozzle.

[0025] Beneficial effects of the present invention:

[0026] In the present invention, the oil pipe body to be connected is moved between the first arc block and the second arc block, and the output shaft of the second servo motor drives the screw to rotate on the bracket, so that the screw drives the connecting block and the sliding block to slide along the bracket. After sliding to a suitable clamping height, the piston rod of the first hydraulic cylinder pulls the push block to drive the locating pin to engage with the locating groove, and then the non-threaded area of ​​the oil pipe body to be connected is clamped by the clamping assembly. Since the clamping center line of the clamping assembly is coaxially arranged with the clamping center line of the two claws, after clamping, the tapered thread groove of the coupling is aligned with the center line of the tapered external thread of the outer peripheral wall of the oil pipe body, so that the thread alignment of the coupling and the oil pipe body is realized, the connection accuracy is improved, the stability and reliability of the connection are enhanced, the loosening caused by thread misalignment is reduced, and even the risk of leakage caused by damage to the thread is reduced, and the connection effect of the airtight oil pipe is improved.

[0027] In the present invention, the piston rod of the first hydraulic cylinder pulls the push block to drive the positioning pin to separate from the positioning groove, and then the output shaft of the second servo motor drives the screw rod to push the connecting block and the sliding block to move along the bracket in the direction of the clamping claw, driving the clamped oil pipe body to descend synchronously. During the descent, the threaded lubricant is applied to the outer surface of the tapered external thread of the oil pipe body by the lubrication component, and the oil pipe body to be connected is rotated to gradually approach the direction of the coupling, and the oil pipe body is threadedly connected to the tapered thread groove of the coupling through the tapered external thread, which facilitates the connection and use of the coupling and the oil pipe body and reduces the operation difficulty and error rate.

[0028] In the present invention, the piston rod of the second hydraulic cylinder pushes the clamping plate to move toward the middle, and at this time the clamping plate drives the positioning rod to slide synchronously along the U-shaped frame, so that the clamping plate drives the rotating column to abut against the outer wall of the coupling or the oil pipe body, and the rotating columns on both sides crimp the oil pipe body, which is convenient for the threaded centering and threaded connection of the coupling and the oil pipe body. When the oil pipe body to be connected is rotated, the rotating column rotates synchronously, which is convenient for installation and use after clamping, improves the accuracy and efficiency of the threaded connection, ensures the stability and continuity during the installation process, and adapts to the clamping of couplings and oil pipe bodies of different diameters.

[0029] In the present invention, the piston rod of the first piston cylinder pushes the lifting block to slide on the second supporting block to a suitable height, and then the piston rod of the second piston cylinder pushes the connecting rod to move, and the connecting rod drives the hollow metal tube to slide along the lifting block, so that the hollow metal tube drives the dust suction box to move, and after the dust suction box is adjusted to be at a suitable distance with the tapered external thread of the oil pipe body, the output shaft of the third servo motor drives the cleaning roller to rotate, so that the cleaning roller contacts the tapered external thread of the oil pipe body, and dust impurities and the like on the outer surface of the tapered external thread of the oil pipe body are cleaned. During the cleaning process, the cleaned dust is transported to the air outlet end through the hollow metal tube by the dust suction fan. At this time, a dust collecting bag is installed on the air outlet end of the dust suction fan, and the collected and cleaned dust is collected by the dust collecting bag, so as to prevent the diffusion and secondary pollution of the dust, and at the same time facilitate subsequent processing and cleaning, and the cleaning brush on the cleaning roller contacts the scraping block, so that the dust attached to the cleaning brush is knocked off, so as to reduce the influence of the dust on the cleaning brush and ensure the continuous cleaning effect.

[0030] In the present invention, after cleaning is completed, the thread lubricating oil is sucked by an oil delivery pump and delivered to the inside of the distribution block through a delivery hose, and is sprayed to the outer surface of the tapered external thread of the cleaned oil pipe body through a nozzle, which facilitates the uniform application of the thread lubricating oil, improves the lubrication efficiency, reduces the friction resistance during thread connection, and prevents thread damage, thereby improving the connection quality and sealing between the coupling and the oil pipe body. The nozzle accurately sprays to the target area, reduces the splashing and waste of the thread lubricating oil, and also reduces the pollution to the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the assembly of the coupling structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 3 It is a schematic diagram of the support structure of the present invention;

[0034] Figure 4 It is a schematic diagram of the support block structure of the present invention;

[0035] Figure 5 It is a rear perspective view of the first arc-shaped block structure of the present invention;

[0036] Figure 6 It is a schematic diagram of the centering assembly structure of the present invention;

[0037] Figure 7 It is a schematic diagram of the structure of the clamping assembly of the present invention;

[0038] Figure 8 It is a schematic diagram of the structure of the lubrication assembly of the present invention;

[0039] Fig. 9 It is a rear perspective view of the dust collection box structure of the present invention;

[0040] Fig.10 It is a rear stereoscopic view of the distribution block structure of the present invention.

[0041] In the figure: 1, coupling; 2, oil pipe body; 3, bracket; 4, sealing ring; 5, claw; 6, support block; 7, mounting frame; 8, limit groove; 9, bidirectional screw; 10, first servo motor; 11, first arc block; 12, second arc block; 13, plug rod; 14, semicircular block; 15, centering assembly; 1501, connecting block; 1502, slider; 1503, fixed block; 1504, first hydraulic cylinder; 1505, push block; 1506, positioning pin; 1507, positioning groove; 1508, second servo motor; 1509, screw; 16, clamping assembly; 1 601, U-shaped frame; 1602, clamping plate; 1603, rotating column; 1604, positioning rod; 1605, second hydraulic cylinder; 17, lubrication assembly; 1701, lifting block; 1702, first piston cylinder; 1703, hollow metal tube; 1704, dust suction fan; 1705, dust suction box; 1706, cleaning roller; 1707, third servo motor; 1708, scraping block; 1709, distribution block; 1710, nozzle; 1711, delivery hose; 1712, oil pump; 1713, liquid inlet pipe; 1714, second piston cylinder; 1715, connecting rod. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0043] Embodiment 1: Figure 1 to Figure 6 As shown, this embodiment provides an airtight oil pipe connection structure, comprising a coupling 1 and an oil pipe body 2 suitable for being connected to the axial end of the coupling 1, wherein the axial end of the coupling 1 is provided with a tapered thread groove, and the outer peripheral wall of the axial end of the oil pipe body 2 is provided with a tapered external thread, and the tapered external thread of the oil pipe body 2 is threadedly connected with the tapered thread groove of the corresponding axial end of the coupling 1;

[0044] The device also includes a connection device, which includes two claws 5 driven to move toward each other to clamp the coupling 1 or move away from each other to loosen the coupling 1. The outer walls of the two claws 5 are fixed with support blocks 6, and the two support blocks 6 are respectively a first support block and a second support block; a first arc block 11 is fixed on the top surface of the first support block, and brackets 3 are respectively fixed at both ends of the first arc block 11. The two brackets 3 are arranged parallel in the axial direction, and a centering component 15 is provided on the bracket 3. The centering component 15 includes a connecting block 1501, and the connecting block 11 is fixed with a first arc block 11. 501 is slidably connected to the corresponding bracket 3, a slider 1502 is fixedly provided on the outer wall of the connecting block 1501, the slider 1502 is slidably connected to the bracket 3, the centering component 15 also includes a clamping component 16 suitable for being actuated to clamp the oil pipe body 2, the clamping center line of the clamping component 16 is coaxially arranged with the clamping center line of the two claws 5, the clamping component 16 includes a U-shaped frame 1601 slidably connected to the first supporting block, and the inner walls of the two connecting blocks 1501 are respectively fixedly connected to the outer walls of the U-shaped frame 1601.

[0045] Specifically, a second arc block 12 is fixedly provided on the top surface of the second support block. The first arc block 11 and the second arc block 12 are suitable for docking through a docking device when the two claws 5 move toward each other. The docking device includes two plug rods 13 connected at both ends of the first arc block 11 and two sockets arranged at both ends of the second arc block 12. The sockets are respectively plugged into and matched with the corresponding plug rods 13; the sockets on the second arc block 12 are plugged into the plug rods 13, which increases the connection strength.

[0046] Specifically, the first support block is provided with a semicircular block 14 below the first arc block 11, and the top surfaces at both ends of the semicircular block 14 are respectively connected to the bottom surfaces of the corresponding brackets 3; when the first support block and the second support block are close to each other, the socket of the second arc block 12 is plugged into and matched with the corresponding insertion rod 13, and as the first arc block 11 moves, the two brackets 3 and the semicircular block 14 move to appropriate positions.

[0047] Specifically, the two claws 5 are suitable for being driven to move toward or away from each other through a claw driving mechanism. The claw driving mechanism includes a mounting frame 7, on which a limiting groove 8 is provided. The two claws 5 are respectively located inside the limiting groove 8. A bidirectional lead screw 9 is rotatably connected inside the limiting groove 8. The outer end of one of the claws 5 is threadedly connected to the forward-rotating thread segment of the bidirectional lead screw 9 through a threaded hole, and the outer end of the other claw 5 is threadedly connected to the reverse-rotating thread of the bidirectional lead screw 9 through a threaded hole. A first servo motor 10 is installed on the mounting frame 7 through a mounting seat, and the output shaft of the first servo motor 10 is coaxially connected to the bidirectional lead screw 9.

[0048] Specifically, a sealing ring 4 is provided inside the coupling 1 near the axial edge, and the inner wall of the sealing ring 4 is in frictional contact with the outer wall of the oil pipe body 2; the bidirectional screw 9 is driven to rotate synchronously by the output shaft of the first servo motor 10, and the bidirectional screw 9 pushes the two claws 5 to slide along the limiting groove 8, so that the claws 5 approach each other, and the claws 5 clamp and fix the coupling 1.

[0049] Specifically, the centering component 15 also includes a fixed block 1503, on which a first hydraulic cylinder 1504 is installed through a mounting seat, a push block 1505 is fixedly provided on the piston rod of the first hydraulic cylinder 1504, a positioning pin 1506 is fixedly provided on the push block 1505, and a plurality of positioning grooves 1507 are provided on the outer wall of the bracket 3 in a uniformly arranged structure, the positioning pin 1506 is slidably connected to the slider 1502, and the positioning pin 1506 is suitable for being pushed and plugged into the positioning groove 1507; the push block 1505 is pulled by the piston rod of the first hydraulic cylinder 1504 to drive the positioning pin 1506 to engage with the positioning groove 1507.

[0050] Specifically, a second servo motor 1508 is installed on the top surface of the first arc block 11 through a mounting seat, and a screw rod 1509 is coaxially connected to the output shaft of the second servo motor 1508. The screw rod 1509 is rotatably connected to the bracket 3, and the connecting block 1501 is threadedly connected to the screw rod 1509 through a threaded hole; the output shaft of the second servo motor 1508 drives the screw rod 1509 to rotate to move the connecting block 1501 and the slider 1502 along the bracket 3 toward the direction of the claw 5, thereby driving the clamped oil pipe body 2 to descend synchronously.

[0051] When the coupling 1 and the oil pipe body 2 are connected, the bidirectional lead screw 9 is driven to rotate synchronously by the output shaft of the first servo motor 10, and the bidirectional lead screw 9 pushes the two claws 5 to slide along the limit groove 8, so that the claws 5 are close to each other, and the claws 5 clamp and fix the coupling 1. At this time, the clamping center line of the two claws 5 is the axis of the coupling 1. In the process of the two claws 5 moving toward each other, the two support blocks 6 will be driven to move toward each other. The first support block drives the first arc block 11 to move, and the second support block drives the second arc block 12 to move. The clamping assembly 16 moves synchronously with the first support block, and the socket on the second arc block 12 is plugged with the plug rod 13, which increases the connection strength. With the movement of the first arc block 11, the two brackets 3 and the semicircular block 14 are driven to move to a suitable position;

[0052] Then, the oil pipe body 2 to be connected is moved between the first arc block 11 and the second arc block 12 by an external device (such as a lifting device), and the output shaft of the second servo motor 1508 drives the screw rod 1509 to rotate on the bracket 3, so that the screw rod 1509 drives the connecting block 1501 and the slider 1502 to slide along the bracket 3. After sliding to a suitable clamping height, the piston rod of the first hydraulic cylinder 1504 pulls the push block 1505 to drive the positioning pin 1506 to engage with the positioning groove 1507, and then the clamping assembly 16 clamps the non-threaded area of ​​the oil pipe body 2 to be connected. Since the clamping center line of the clamping assembly 16 is coaxially arranged with the clamping center line of the two claws 5, after clamping, the tapered thread groove of the coupling 1 is aligned with the center line of the tapered external thread of the outer peripheral wall of the oil pipe body 2, so that the thread alignment of the coupling 1 and the oil pipe body 2 is achieved, the connection accuracy is improved, the stability and reliability of the connection are enhanced, the loosening caused by the thread misalignment, and even the leakage risk caused by the damage of the thread is reduced, and the connection effect of the airtight oil pipe is improved;

[0053] When thread connection is performed after the thread is centered, the piston rod of the first hydraulic cylinder 1504 pulls the push block 1505 to drive the positioning pin 1506 to separate from the positioning groove 1507, and then the output shaft of the second servo motor 1508 drives the screw rod 1509 to push the connecting block 1501 and the sliding block 1502 to move along the bracket 3 in the direction of the claw 5, driving the clamped oil pipe body 2 to descend synchronously, and rotating the oil pipe body 2 to be connected, so that the oil pipe body 2 gradually approaches the direction of the coupling 1, and the oil pipe body 2 is threadedly connected to the tapered thread groove of the coupling 1 through the tapered external thread, which facilitates the connection and use of the coupling 1 and the oil pipe body 2, and reduces the difficulty and error rate of operation; in addition, by controlling the action of the second servo motor 1508 and the rotation of the oil pipe body 2 to be connected, the threaded connection depth of the oil pipe body 2 and the coupling 1 can also be controlled to avoid the phenomenon of excessive screwing.

[0054] After the connection is completed, the clamping claw 5 is separated from the coupling 1, and the clamping assembly 16 is also separated from the oil pipe body 2, and the clamping claw 5 and the clamping assembly 16 are both restored to their initial positions.

[0055] Embodiment 2: Figure 1 , Figure 4 , Figure 5 and Figure 7As shown, this embodiment is based on the previous embodiment, and further adds the following structure on the basis of embodiment one, specifically: the clamping assembly 16 includes two clamping plates 1602 slidably arranged on a U-shaped frame 1601, the inner wall of the clamping plate 1602 is rotatably connected with a plurality of rotating columns 1603, and the side wall of the slider 1502 is installed with a second hydraulic cylinder 1605 corresponding to the clamping plate 1602 through a mounting seat, the piston rod of the second hydraulic cylinder 1605 penetrates the U-shaped frame 1601, and the piston rod of the second hydraulic cylinder 1605 is fixedly connected to the corresponding clamping plate 1602; the piston rod of the second hydraulic cylinder 1605 pushes the clamping plate 1602 to move toward the middle, so that the clamping plate 1602 drives the rotating column 1603 to abut against the outer wall of the oil pipe body 2.

[0056] Specifically, two positioning rods 1604 are fixedly disposed on the outer wall of the clamping plate 1602 . The positioning rods 1604 penetrate the U-shaped frame 1601 and extend to the outside. The positioning rods 1604 are slidably connected to the U-shaped frame 1601 .

[0057] During clamping, the piston rod of the second hydraulic cylinder 1605 pushes the clamping plate 1602 to move toward the middle. At this time, the clamping plate 1602 drives the positioning rod 1604 to slide synchronously along the U-shaped frame 1601, so that the clamping plate 1602 drives the rotating column 1603 to abut against the outer wall of the oil pipe body 2. The rotating columns 1603 on both sides crimp the oil pipe body 2, which is convenient for the threaded centering and threaded connection of the coupling 1 and the oil pipe body 2. When the oil pipe body 2 to be connected is rotated, the rotating column 1603 rotates synchronously, which is convenient for installation and use after clamping, improves the accuracy and efficiency of the threaded connection, ensures the stability and continuity during the installation process, and adapts to the clamping of couplings 1 and oil pipe bodies 2 of different diameters.

[0058] Embodiment 3: Figure 1 , Figure 2 , Fig. 9 and Fig.10As shown, this embodiment is based on the first embodiment or the second embodiment, and further adds the following structure on the basis of the first embodiment or the second embodiment, specifically: a lubrication assembly 17 is provided on the second support block, and the lubrication assembly 17 includes a lifting block 1701, and the lifting block 1701 is slidably mounted on the second support block; the lubrication assembly 17 also includes a first piston cylinder 1702, and the first piston cylinder 1702 is mounted on the second support block through a mounting seat, and the top surface of the piston rod of the first piston cylinder 1702 is fixedly connected to the bottom surface of the lifting block 1701, and a hollow metal tube 1703 is slidably inserted on the lifting block 1701, and a second piston cylinder 1714 is installed on the side wall of the lifting block 1701 through a mounting seat, and a connecting rod 1715 is fixedly provided on the outer end side wall of the hollow metal tube 1703, and the piston of the second piston cylinder 1714 The rod is fixedly connected to the connecting rod 1715; the outer end of the hollow metal tube 1703 is connected to the dust suction fan 1704, and the outer peripheral wall of the inner end of the hollow metal tube 1703 is fixedly provided with a dust suction box 1705, and the interior of the dust suction box 1705 is connected to the hollow metal tube 1703; the piston rod of the second piston cylinder 1714 pushes the connecting rod 1715 to move, and the connecting rod 1715 drives the hollow metal tube 1703 to slide on the lifting block 1701, so that the hollow metal tube 1703 drives the dust suction box 1705 to move to cooperate with the tapered external thread of the oil pipe body 2; the dust after cleaning is transported to the air outlet through the hollow metal tube 1703 by the dust suction fan 1704, and at this time, a dust collecting bag is installed on the air outlet of the dust suction fan 1704, and the collected and cleaned dust is collected by the dust collecting bag.

[0059] A cleaning roller 1706 is rotatably connected inside the dust box 1705, and a third servo motor 1707 is installed on the top surface of the dust box 1705 through a mounting seat. The output shaft of the third servo motor 1707 is coaxially connected to the cleaning roller 1706, and a scraper block 1708 is fixedly provided on the inner side wall of the dust box 1705; the cleaning roller 1706 is driven to rotate by the output shaft of the third servo motor 1707, so that the cleaning roller 1706 contacts the tapered external thread of the oil pipe body 2, and dust and impurities on the outer surface of the tapered external thread of the oil pipe body 2 are cleaned.

[0060] A distribution block 1709 is fixedly provided on the side wall of the dust collection box 1705, and a plurality of nozzles 1710 are connected to the inner wall of the distribution block 1709. A delivery hose 1711 is connected to the distribution block 1709, and the delivery hose 1711 is connected to an oil pump 1712. The liquid inlet end of the oil pump 1712 is connected to a liquid inlet pipe 1713, and the oil pump 1712 is installed on the top surface of the lifting block 1701 through a mounting seat; the threaded lubricating oil is sucked by the oil pump 1712, and is delivered to the inside of the distribution block 1709 through the delivery hose 1711, and is sprayed to the outer surface of the conical external thread of the cleaned oil pipe body 2 through the nozzle 1710.

[0061] In the above process, before applying thread lubricant to the tapered external threads of the oil pipe body 2, the piston rod of the first piston cylinder 1702 pushes the lifting block 1701 to slide on the second support block to a suitable height, and then the piston rod of the second piston cylinder 1714 pushes the connecting rod 1715 to move, and the connecting rod 1715 drives the hollow metal tube 1703 to slide along the lifting block 1701, so that the hollow metal tube 1703 drives the dust box 1705 to move, and after the dust box 1705 is adjusted to be at a suitable distance from the tapered external threads of the oil pipe body 2, the third The output shaft of the servo motor 1707 drives the cleaning roller 1706 to rotate, so that the cleaning roller 1706 contacts the tapered external thread of the oil pipe body 2, and cleans the dust and impurities on the outer surface of the tapered external thread of the oil pipe body 2. During the cleaning process, the dust is transported to the air outlet through the hollow metal tube 1703 by the dust suction fan 1704. At this time, a dust collecting bag is installed on the air outlet of the dust suction fan 1704. The dust collected and cleaned is collected by the dust collecting bag, which prevents the diffusion and secondary pollution of dust and facilitates subsequent treatment and cleaning.

[0062] When the cleaning roller 1706 rotates, the cleaning brush on the cleaning roller 1706 contacts the scraping block 1708, knocking the dust attached to the cleaning brush off, and the dust knocked off is synchronously sucked out by the dust suction box 1705, thereby reducing the impact of dust on the cleaning brush, extending the service life of the brush, and ensuring a continuous cleaning effect;

[0063] After cleaning is completed, the thread lubricant is sucked by the oil pump 1712 and delivered to the inside of the distribution block 1709 through the delivery hose 1711, and sprayed to the outer surface of the conical external thread of the cleaned oil pipe body 2 through the nozzle 1710, which facilitates the uniform application of the thread lubricant, improves the lubrication efficiency, reduces the friction resistance during threaded connection, and prevents thread damage, thereby improving the connection quality and sealing between the coupling 1 and the oil pipe body 2. The nozzle 1710 accurately sprays to the target area, reducing the splashing and waste of the thread lubricant, and also reducing pollution to the surrounding environment.

[0064] Working principle:

[0065] When the butt collar 1 and the oil pipe body 2 are connected, the output shaft of the first servo motor 10 drives the bidirectional lead screw 9 to rotate synchronously, and the bidirectional lead screw 9 pushes the two claws 5 to slide along the limit groove 8, so that the claws 5 are close to each other, and the claws 5 clamp and fix the butt collar 1. At this time, the clamping center line of the two claws 5 is the axis of the butt collar 1. In the process of the two claws 5 moving toward each other, the two support blocks 6 will be driven to move toward each other. The first support block drives the first arc block 11 to move, and the second support block drives the second arc block 12 to move. The clamping assembly 16 and the lubrication assembly 17 move synchronously with the first support block, and the socket on the second arc block 12 is plugged with the plug rod 13, which increases the connection strength. With the movement of the first arc block 11, the two brackets 3 and the semicircular block 14 are driven to move to a suitable position;

[0066] Then, the oil pipe body 2 to be connected is moved between the first arc block 11 and the second arc block 12 by an external device (such as a lifting device), and the output shaft of the second servo motor 1508 drives the screw rod 1509 to rotate on the bracket 3, so that the screw rod 1509 drives the connecting block 1501 and the slider 1502 to slide along the bracket 3. After sliding to a suitable clamping height, the piston rod of the first hydraulic cylinder 1504 pulls the push block 1505 to drive the positioning pin 1506 to engage with the positioning groove 1507, and then the clamping assembly 1 is clamped. 6. The non-threaded area of ​​the oil pipe body 2 to be connected is clamped. Since the clamping center line of the clamping assembly 16 is coaxially arranged with the clamping center line of the two claws 5, after clamping, the tapered thread groove of the coupling 1 is aligned with the center line of the tapered external thread of the outer peripheral wall of the oil pipe body 2, so that the thread alignment of the coupling 1 and the oil pipe body 2 is achieved, the connection accuracy is improved, the stability and reliability of the connection are enhanced, the risk of leakage caused by looseness or even damage to the thread due to thread misalignment is reduced, and the connection effect of the airtight oil pipe is improved;

[0067] When thread connection is performed after the thread is centered, the piston rod of the first hydraulic cylinder 1504 pulls the push block 1505 to drive the positioning pin 1506 to separate from the positioning groove 1507, and then the output shaft of the second servo motor 1508 drives the screw rod 1509 to push the connecting block 1501 and the sliding block 1502 to move along the bracket 3 in the direction of the claw 5, driving the clamped oil pipe body 2 to descend synchronously, and rotating the oil pipe body 2 to be connected, so that the oil pipe body 2 gradually approaches the direction of the coupling 1, and the oil pipe body 2 is threadedly connected to the tapered thread groove of the coupling 1 through the tapered external thread, which facilitates the connection and use of the coupling 1 and the oil pipe body 2, and reduces the difficulty and error rate of operation; in addition, by controlling the action of the second servo motor 1508 and the rotation of the oil pipe body 2 to be connected, the threaded connection depth of the oil pipe body 2 and the coupling 1 can also be controlled to avoid the phenomenon of excessive screwing. After the connection is completed, the clamping claw 5 is separated from the coupling 1, and the clamping assembly 16 is also separated from the oil pipe body 2, and the clamping claw 5 and the clamping assembly 16 are both restored to their initial positions.

[0068] In the above process, before applying thread lubricant to the tapered external threads of the oil pipe body 2, the piston rod of the first piston cylinder 1702 pushes the lifting block 1701 to slide on the second support block to a suitable height, and then the piston rod of the second piston cylinder 1714 pushes the connecting rod 1715 to move, and the connecting rod 1715 drives the hollow metal tube 1703 to slide along the lifting block 1701, so that the hollow metal tube 1703 drives the dust box 1705 to move, and after the dust box 1705 is adjusted to be at a suitable distance from the tapered external threads of the oil pipe body 2, the third The output shaft of the servo motor 1707 drives the cleaning roller 1706 to rotate, so that the cleaning roller 1706 contacts the tapered external thread of the oil pipe body 2, and cleans the dust and impurities on the outer surface of the tapered external thread of the oil pipe body 2. During the cleaning process, the dust is transported to the air outlet through the hollow metal tube 1703 by the dust suction fan 1704. At this time, a dust collecting bag is installed on the air outlet of the dust suction fan 1704. The dust collected and cleaned is collected by the dust collecting bag, which prevents the diffusion and secondary pollution of dust and facilitates subsequent treatment and cleaning.

[0069] When the cleaning roller 1706 rotates, the cleaning brush on the cleaning roller 1706 contacts the scraping block 1708, knocking the dust attached to the cleaning brush off, and the dust knocked off is synchronously sucked out by the dust suction box 1705, thereby reducing the impact of dust on the cleaning brush, extending the service life of the brush, and ensuring a continuous cleaning effect;

[0070] After cleaning is completed, the thread lubricant is sucked by the oil pump 1712 and delivered to the inside of the distribution block 1709 through the delivery hose 1711, and sprayed to the outer surface of the conical external thread of the cleaned oil pipe body 2 through the nozzle 1710, which facilitates the uniform application of the thread lubricant, improves the lubrication efficiency, reduces the friction resistance during threaded connection, and prevents thread damage, thereby improving the connection quality and sealing between the coupling 1 and the oil pipe body 2. The nozzle 1710 accurately sprays to the target area, reducing the splashing and waste of the thread lubricant, and also reducing pollution to the surrounding environment.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An airtight oil pipe connection structure, comprising a coupling (1) and an oil pipe body (2) adapted to be connected to an axial end of the coupling (1), characterized in that: The axial end of the coupling (1) is provided with a tapered thread groove, the outer peripheral wall of the axial end of the oil pipe body (2) is provided with a tapered external thread, and the tapered external thread of the oil pipe body (2) is threadedly connected with the tapered thread groove of the corresponding axial end of the coupling (1); The device also comprises a connection device, the connection device comprising two claws (5) driven to move towards each other to clamp the coupling (1) or move away from each other to loosen the coupling (1), the outer walls of the two claws (5) are fixedly provided with support blocks (6), the two support blocks (6) are respectively a first support block and a second support block; a first arc block (11) is fixedly provided on the top surface of the first support block, the two ends of the first arc block (11) are respectively fixedly provided with brackets (3), the two brackets (3) are arranged parallel in the axial direction, a centering component (15) is provided on the bracket (3), the centering component (15) comprises a connection block (1501), the connection block (1501) is slidably connected to the corresponding bracket (3), a sliding block (1502) is fixedly provided on the outer wall of the connecting block (1501), and the sliding block (1502) is slidably connected to the bracket (3), the centering assembly (15) further comprises a clamping assembly (16) adapted to be actuated to clamp the oil pipe body (2), the clamping center line of the clamping assembly (16) is coaxially arranged with the clamping center line of the two claws (5), the clamping assembly (16) comprises a U-shaped frame (1601) slidably connected to the first supporting block, and the inner walls of the two connecting blocks (1501) are respectively fixedly connected to the outer walls of the U-shaped frame (1601); The centering component (15) further comprises a fixed block (1503), a first hydraulic cylinder (1504) being mounted on the fixed block (1503) via a mounting seat, a push block (1505) being fixedly mounted on the piston rod of the first hydraulic cylinder (1504), a positioning pin (1506) being fixedly mounted on the push block (1505), a plurality of positioning grooves (1507) being arranged in a uniform structure on the outer wall of the bracket (3), the positioning pin (1506) being slidably connected to the slider (1502), and the positioning pin (1506) being adapted to be plugged into and matched with the positioning groove (1507) after being pushed; A second servo motor (1508) is mounted on the top surface of the first arc-shaped block (11) via a mounting seat, a screw rod (1509) is coaxially connected to the output shaft of the second servo motor (1508), the screw rod (1509) is rotatably connected to the bracket (3), and the connecting block (1501) is threadedly connected to the screw rod (1509) via a threaded hole.

2. The airtight oil pipe connection structure according to claim 1, characterized in that: A second arc block (12) is fixedly provided on the top surface of the second supporting block. The first arc block (11) and the second arc block (12) are adapted to be butted against each other via a butt joint device when the two claws (5) move towards each other. The butt joint device comprises two insertion rods (13) connected at two ends of the first arc block (11) and two insertion holes arranged at two ends of the second arc block (12), the insertion holes respectively being plugged into and matched with the corresponding insertion rods (13).

3. The airtight oil pipe connection structure according to claim 2, characterized in that: The first support block is provided with a semicircular block (14) below the first arc-shaped block (11), and the top surfaces at both ends of the semicircular block (14) are respectively connected to the bottom surfaces of the corresponding brackets (3).

4. The airtight oil pipe connection structure according to claim 3, characterized in that: The two clamping claws (5) are suitable for being driven to move toward each other or away from each other by a clamping claw driving mechanism, and the clamping claw driving mechanism comprises a mounting frame (7), and a limiting groove (8) is provided on the mounting frame (7). The two clamping claws (5) are respectively located inside the limiting groove (8), and a bidirectional lead screw (9) is rotatably connected inside the limiting groove (8), wherein the outer end of one of the clamping claws (5) is threadedly connected to the forward-spinning thread section of the bidirectional lead screw (9) through a threaded hole, and the outer end of the other clamping claw (5) is threadedly connected to the reverse-spinning thread section of the bidirectional lead screw (9) through a threaded hole, and a first servo motor (10) is installed on the mounting frame (7) through a mounting seat, and the output shaft of the first servo motor (10) is coaxially connected to the bidirectional lead screw (9); A sealing ring (4) is provided inside the coupling (1) near the axial edge, and the inner wall of the sealing ring (4) is in frictional contact with the outer peripheral wall of the oil pipe body (2).

5. The airtight oil pipe connection structure according to claim 1, characterized in that: The clamping assembly (16) comprises two clamping plates (1602) slidably arranged on a U-shaped frame (1601); the inner wall of the clamping plate (1602) is rotatably connected to a plurality of rotating columns (1603); a second hydraulic cylinder (1605) corresponding to the clamping plate (1602) is mounted on the side wall of the slider (1502) via a mounting seat; a piston rod of the second hydraulic cylinder (1605) penetrates the U-shaped frame (1601); and the piston rod of the second hydraulic cylinder (1605) is fixedly connected to the corresponding clamping plate (1602).

6. The airtight oil pipe connection structure according to claim 5, characterized in that: Two positioning rods (1604) are fixedly provided on the outer wall of the clamping plate (1602), and the positioning rods (1604) penetrate the U-shaped frame (1601) and extend to the outside, and the positioning rods (1604) are slidably connected to the U-shaped frame (1601).

7. The airtight oil pipe connection structure according to claim 1, characterized in that: The second support block is provided with a lubrication assembly (17), the lubrication assembly (17) comprising a lifting block (1701), the lifting block (1701) being slidably mounted on the second support block (6); the lubrication assembly (17) further comprises a first piston cylinder (1702), the first piston cylinder (1702) being mounted on the second support block via a mounting seat, the top surface of the piston rod of the first piston cylinder (1702) being fixedly connected to the bottom surface of the lifting block (1701), and a hollow metal tube (1703) being slidably inserted on the lifting block (1701). A second piston cylinder (1714) is installed on the side wall of the lifting block (1701) via a mounting seat; a connecting rod (1715) is fixedly provided at the outer end of the hollow metal tube (1703); the piston rod of the second piston cylinder (1714) is fixedly connected to the connecting rod (1715); the outer end of the hollow metal tube (1703) is connected to a dust suction fan (1704); a dust suction box (1705) is fixedly provided on the outer peripheral wall of the inner end of the hollow metal tube (1703); the interior of the dust suction box (1705) is connected to the hollow metal tube (1703).

8. The airtight oil pipe connection structure according to claim 7, characterized in that: The dust box (1705) is rotatably connected to a cleaning roller (1706) inside, a third servo motor (1707) is mounted on the top surface of the dust box (1705) via a mounting seat, an output shaft of the third servo motor (1707) is coaxially connected to the cleaning roller (1706), a scraping block (1708) is fixedly mounted on the inner side wall of the dust box (1705), a distribution block (1709) is fixedly mounted on the side wall of the dust box (1705), a plurality of nozzles (1710) are connected to the inner side wall of the distribution block (1709), a delivery hose (1711) is connected to the distribution block (1709), an oil delivery pump (1712) is connected to the delivery hose (1711), a liquid inlet end of the oil delivery pump (1712) is connected to a liquid inlet pipe (1713), and the oil delivery pump (1712) is mounted on the top surface of the lifting block (1701) via a mounting seat.

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