Gas-tight oil pipe connection structure

Abstract

The present invention relates to the technical field of oil pipe connection, in particular to a gas-tight oil pipe connection structure, comprising a coupling and an oil pipe body adapted to be connected to an axial end portion of the coupling, wherein an axial end portion of the coupling is provided with a tapered threaded groove, the outer peripheral wall of an axial end portion of the oil pipe body is provided with a tapered external thread, and the tapered external thread of the oil pipe body is in threaded connection with the tapered threaded groove of the corresponding axial end portion of the coupling. The gas-tight oil pipe connection structure further comprises a connection device, wherein the connection device comprises two clamping jaws driven to move towards each other to clamp the coupling or to move away from each other to release the coupling; and support blocks are fixedly provided on the outer walls of the two clamping jaws, the two support blocks being respectively a first support block and a second support block. The present invention realizes thread centering between the coupling and the oil pipe body, thus improving the accuracy of connection, enhancing the stability and reliability of connection, reducing the risk of leakage caused by the loosening or even damage of threads due to thread misalignment, and improving the connection effect of the gas-tight oil pipe.

Description

A gas-tight oil pipe connection structure Technical Field

[0001] This invention relates to the field of oil pipe connection technology, and in particular to an airtight oil pipe connection structure. Background Technology

[0002] Oil tubing is a type of oil-specific pipe used extensively in oil and gas field development. It is used to withstand the pressure generated during the development process. With the development of deep wells, ultra-deep wells, and high-pressure gas wells, the load on the tubing string has increased significantly. At the same time, the high-temperature environment reduces the load-bearing capacity of the tubing. The connection performance of the tubing joint is the most critical factor to ensure the safety of the tubing.

[0003] A search revealed that Chinese patent CN201288903Y discloses a threaded connection joint for oil casing with a negative bearing face angle. It includes a coupling and a sleeve threaded to both ends of the coupling. In this structure, the coupling and the sleeve are connected by threads. During the connection, the alignment of the threads is very important. If the alignment is not accurate, it will cause the threads to deviate or even misalign, resulting in sealing failure after use. This reduces the stability of the connection, increases the risk of connection failure and subsequent leakage, and is not conducive to the connection and use of gas-tight oil pipes. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an airtight oil pipe connection structure. Through precise thread alignment, it improves connection accuracy, enhances connection stability and reliability, reduces damage to the threads at the connection point, minimizes the risk of loosening or leakage due to thread misalignment, improves connection performance, achieves reliable connection, and reduces safety risks caused by loosening or oil leakage.

[0005] To solve the above technical problems, the present invention provides the following technical solution: an airtight oil pipe connection structure, including 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, wherein the tapered external thread of the oil pipe body is threadedly connected to the tapered thread groove of the corresponding axial end of the coupling.

[0006] It also includes a connecting device, which comprises two jaws driven to move toward each other to clamp a coupling or move away from each other to loosen the coupling. Support blocks are fixed to the outer walls of both jaws, and these two support blocks are a first support block and a second support block, respectively. A first arc-shaped block is fixed to the top surface of the first support block, and brackets are fixed to both ends of the first arc-shaped block. The two brackets are arranged parallel to each other in the axial direction. A centering component is provided on each bracket, and the centering component includes a connecting block that is slidably connected to the corresponding bracket. A slider is fixed to the outer wall of the connecting block and is slidably connected to the bracket. The centering component also includes a clamping component adapted to be actuated to clamp the tubing body. The clamping centerline of the clamping component is coaxial with the clamping centerline of the two jaws. The clamping component includes a U-shaped frame slidably connected to the first support block, and the inner walls of the two connecting blocks are fixedly connected to the outer wall of the U-shaped frame, respectively.

[0007] Preferably, a second arc-shaped block is fixed on the top surface of the second support block, and the first arc-shaped block and the second arc-shaped block are adapted to be docked by a docking device when the two claws move towards each other. The docking device includes two rods connected to both ends of the first arc-shaped block and two holes provided at both ends of the second arc-shaped block. The holes are respectively engaged with the corresponding rods.

[0008] The above technical solution allows the insertion holes on the second arc-shaped block to be connected to the insertion rod, increasing the connection strength.

[0009] Preferably, the centering component includes a fixing block, and the first support block has a semi-circular block below the first arc-shaped block, with the top surfaces of the two ends of the semi-circular block respectively connected to the bottom surfaces of the corresponding brackets.

[0010] With the above technical solution, when the first support block and the second support block approach each other, the insertion hole of the second arc-shaped block engages with the corresponding insertion rod. As the first arc-shaped block moves, the two brackets and the semicircular block move to the appropriate position.

[0011] Preferably, the two jaws are adapted to be driven to move towards each other or backwards by a jaw drive mechanism. The jaw drive mechanism includes a mounting frame with a limit groove. The two jaws are located inside the limit groove. A bidirectional lead screw is rotatably connected inside the limit groove. The outer end of one jaw is threaded to the forward thread section of the bidirectional lead screw through a threaded hole, and the outer end of the other jaw is threaded to the reverse thread section of the bidirectional lead screw through a threaded hole. A first servo motor is mounted on the mounting frame via a mounting base. The output shaft of the first servo motor is coaxially connected to the bidirectional lead screw.

[0012] A sealing ring is provided 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. The bidirectional lead screw pushes the two jaws to slide along the limit groove, so that the jaws move closer to each other and the jaws engage with the clamp to clamp and fix them.

[0014] Preferably, the centering component further includes a fixing block, on which a first hydraulic cylinder is mounted via a mounting seat. A push block is fixed on the piston rod of the first hydraulic cylinder, and a positioning pin is fixed on the push block. The outer wall of the bracket has a plurality of positioning grooves arranged in a uniform structure. The positioning pin is slidably connected to the slider, and the positioning pin is adapted to be pushed and engaged with the positioning groove.

[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-shaped block via a mounting base, and a lead screw is coaxially connected to the output shaft of the second servo motor. The lead screw is rotatably connected to the bracket, and the connecting block is threadedly connected to the lead screw via a threaded hole.

[0017] The above technical solution uses the output shaft of the second servo motor to drive the lead screw to rotate, thereby moving the connecting block and the slider along the bracket towards the chuck, which in turn causes the clamped oil pipe body to descend synchronously.

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

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

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

[0021] Preferably, the second support block is provided with a lubrication assembly, the lubrication assembly including a lifting block, the lifting block being slidably mounted on the second support block; the lubrication assembly also includes a first piston cylinder, the first piston cylinder being mounted on the second support block via a mounting seat, the top surface of the piston rod of the first piston cylinder being fixedly connected to the bottom surface of the lifting block, a hollow metal tube being slidably inserted into the lifting block, a second piston cylinder being mounted on the side wall of the lifting block via a mounting seat, a connecting rod being fixedly provided at the outer end of the hollow metal tube, and the piston rod of the second piston cylinder being fixedly connected to the connecting rod; a dust collector is connected to the outer end of the hollow metal tube, and a dust collection box is fixedly provided on the outer peripheral wall of the inner end of the hollow metal tube, the interior of the dust collection box being 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 collection box to move to engage with the tapered external thread of the oil pipe body; the dust collected after cleaning is transported to the air outlet through the hollow metal tube by the dust collection fan. At this time, a dust collection bag is installed on the air outlet of the dust collection fan, and the dust collected and cleaned is collected by the dust collection bag.

[0023] Preferably, a cleaning roller is rotatably connected inside the dust collection box, a third servo motor is mounted on the top surface of the dust collection box via a mounting base, 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 collection box, a distribution block is fixedly provided on the side wall of the dust collection box, multiple 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, an inlet pipe is connected to the inlet end of the oil pump, and the oil pump is mounted on the top surface of the lifting block via a mounting base.

[0024] The above technical solution involves rotating the cleaning roller via the output shaft of the third servo motor, causing the cleaning roller to contact the tapered external thread of the oil pipe body, cleaning dust and impurities from the outer surface of the tapered external thread of the oil pipe body, drawing thread lubricating oil through an oil pump, delivering it to the inside of the distribution block through a delivery hose, and spraying it onto the cleaned outer surface of the tapered external thread of the oil pipe body through a nozzle.

[0025] The beneficial effects of this invention are:

[0026] 1. In this invention, the oil pipe body to be connected is moved between the first arc-shaped block and the second arc-shaped block. The output shaft of the second servo motor drives the lead screw to rotate on the bracket, causing the lead screw to drive the connecting block and the slider 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 positioning pin to engage with the positioning groove. Then, the clamping assembly clamps the non-threaded area of ​​the oil pipe body to be connected. Since the clamping center line of the clamping assembly is coaxial with the clamping center line of the two jaws, after clamping, the conical thread groove of the coupling is aligned with the center line of the conical external thread on the outer peripheral wall of the oil pipe body, realizing thread alignment between the coupling and the oil pipe body, improving the connection accuracy, enhancing the connection stability and reliability, reducing the risk of loosening or even leakage caused by thread misalignment or damage to the threads, and improving the connection effect of the gas-tight oil pipe.

[0027] 2. In this invention, the piston rod of the first hydraulic cylinder pulls the push block to separate the positioning pin from the positioning groove. Then, the output shaft of the second servo motor drives the lead screw to push the connecting block and the slider to move along the bracket towards the jaws, causing the clamped oil pipe body to descend synchronously. During the descent, the lubrication component applies thread lubricating oil to the outer surface of the tapered external thread of the oil pipe body, and the oil pipe body to be connected is rotated, so that the oil pipe body gradually moves closer to the coupling. The oil pipe body is then 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 difficulty of operation and the error rate.

[0028] 3. In this invention, the piston rod of the second hydraulic cylinder pushes the clamping plate to move towards the center. 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. The rotating columns on both sides press the oil pipe body, which facilitates the thread alignment 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 facilitates the installation and use after clamping, improves the accuracy and efficiency of the threaded connection, ensures the stability and continuity of the installation process, and is suitable for clamping couplings and oil pipe bodies of different diameters.

[0029] 4. In this invention, the piston rod of the first piston cylinder pushes the lifting block to slide on the second support block to a suitable height. Then, the piston rod of the second piston cylinder pushes the connecting rod to move. The connecting rod drives the hollow metal tube to slide along the lifting block, causing the hollow metal tube to move the dust collection box. After adjusting the dust collection box to a suitable distance from 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, cleaning the dust and impurities on the outer surface of the tapered external thread of the oil pipe body. During the cleaning process, the dust collected after cleaning is transported to the air outlet through the hollow metal tube by the vacuum fan. At this time, a dust collection bag is installed on the air outlet of the vacuum fan. The dust collected and cleaned is collected by the dust collection bag, preventing the spread of dust and secondary pollution, and facilitating subsequent processing and cleaning. The cleaning brush on the cleaning roller contacts the scraping block, knocking off the dust attached to the cleaning brush, reducing the impact of dust on the cleaning brush and ensuring continuous cleaning effect.

[0030] 5. In this invention, after cleaning, the thread lubricating oil is drawn in by an oil pump and delivered to the inside of the distribution block through a delivery hose. It is then sprayed onto the outer surface of the tapered external thread of the cleaned oil pipe body through a nozzle. This facilitates the uniform application of thread lubricating oil, improves lubrication efficiency, reduces frictional resistance during threaded connections, and prevents thread damage. This improves the connection quality and sealing between the coupling and the oil pipe body. The nozzle accurately sprays the target area, reducing the splashing and waste of thread lubricating oil, and also reducing pollution to the surrounding environment. Attached Figure Description

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

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

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

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

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

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

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

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

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

[0040] Figure 10 is a rear perspective view of the distribution block structure of the present invention.

[0041] In the diagram: 1. Coupling; 2. Oil pipe body; 3. Bracket; 4. Sealing ring; 5. Claw; 6. Support block; 7. Mounting bracket; 8. Limiting groove; 9. Bidirectional lead screw; 10. First servo motor; 11. First arc-shaped block; 12. Second arc-shaped block; 13. Insert rod; 14. Semicircular block; 15. Centering assembly; 1501. Connecting block; 1502. Slider; 1503. Fixing block; 1504. First hydraulic cylinder; 1505. Push block; 1506. Positioning pin; 1507. Positioning groove; 1508. Second servo motor; 1509. Lead screw; 16. Clamping assembly; 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 extraction fan; 1705. Dust extraction box; 1706. Sweeping 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 Implementation

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] As shown in Figures 1 to 6, this embodiment provides an airtight oil pipe connection structure, including a coupling 1 and an oil pipe body 2 suitable for connection to the axial end of the coupling 1. 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. The tapered external thread of the oil pipe body 2 is threadedly connected to the tapered thread groove of the corresponding axial end of the coupling 1.

[0045] It also includes a connecting device, which comprises two jaws 5 driven to move toward each other to clamp the coupling 1 or move away from each other to release the coupling 1. Support blocks 6 are fixed to the outer walls of both jaws 5, and the two support blocks 6 are respectively a first support block and a second support block. A first arc-shaped block 11 is fixed to the top surface of the first support block, and brackets 3 are fixed to both ends of the first arc-shaped block 11. The two brackets 3 are arranged parallel to each other in the axial direction. A centering component 15 is provided on the brackets 3, and the centering component 15 includes a connecting block 1501. 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 adapted to be 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 jaws 5. The clamping component 16 includes a U-shaped frame 1601 slidably connected to the first support block. The inner walls of the two connecting blocks 1501 are respectively fixedly connected to the outer wall of the U-shaped frame 1601.

[0046] Specifically, a second arc-shaped block 12 is fixed on the top surface of the second support block. The first arc-shaped block 11 and the second arc-shaped block 12 are adapted to be connected by a docking device when the two claws 5 move towards each other. The docking device includes two insert rods 13 connected to both ends of the first arc-shaped block 11 and two insertion holes provided at both ends of the second arc-shaped block 12. The insertion holes are respectively inserted into the corresponding insert rods 13. The insertion holes on the second arc-shaped block 12 are inserted into the insert rods 13, which increases the connection strength.

[0047] Specifically, the first support block has a semi-circular block 14 below the first arc-shaped block 11, and the top surfaces of the two ends of the semi-circular block 14 are respectively connected to the bottom surfaces of the corresponding brackets 3; when the first support block and the second support block approach each other, the insertion hole of the second arc-shaped block 12 is engaged with the corresponding insertion rod 13, and as the first arc-shaped block 11 moves, the two brackets 3 and the semi-circular block 14 move to the appropriate position.

[0048] Specifically, the two jaws 5 are adapted to be driven to move in opposite directions or backwards by a jaw drive mechanism. The jaw drive mechanism includes a mounting frame 7, on which a limit groove 8 is formed. The two jaws 5 are respectively located inside the limit groove 8. A bidirectional lead screw 9 is rotatably connected inside the limit groove 8. The outer end of one jaw 5 is threaded to the forward thread section of the bidirectional lead screw 9 through a threaded hole, and the outer end of the other jaw 5 is threaded to the reverse thread section of the bidirectional lead screw 9 through a threaded hole. A first servo motor 10 is mounted on the mounting frame 7 through a mounting base. The output shaft of the first servo motor 10 is coaxially connected to the bidirectional lead screw 9.

[0049] 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 peripheral wall of the oil pipe body 2; 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 limiting groove 8, so that the claws 5 move closer to each other and clamp and fix the coupling 1.

[0050] Specifically, the centering component 15 also includes a fixing block 1503. A first hydraulic cylinder 1504 is mounted on the fixing block 1503 via a mounting seat. A push block 1505 is fixed on the piston rod of the first hydraulic cylinder 1504. A positioning pin 1506 is fixed on the push block 1505. The outer wall of the bracket 3 has a plurality of positioning grooves 1507 arranged in a uniform structure. The positioning pin 1506 is slidably connected to the slider 1502. The positioning pin 1506 is suitable for being pushed and engaging with the positioning groove 1507. The piston rod of the first hydraulic cylinder 1504 pulls the push block 1505, causing the positioning pin 1506 to engage with the positioning groove 1507.

[0051] Specifically, a second servo motor 1508 is mounted on the top surface of the first arc-shaped block 11 via a mounting base. A lead screw 1509 is coaxially connected to the output shaft of the second servo motor 1508. The lead screw 1509 is rotatably connected to the bracket 3. A connecting block 1501 is threadedly connected to the lead screw 1509 via a threaded hole. The output shaft of the second servo motor 1508 drives the lead screw 1509 to rotate, thereby moving the connecting block 1501 and the slider 1502 along the bracket 3 toward the chuck 5, causing the clamped oil pipe body 2 to descend synchronously.

[0052] When the coupling 1 and the oil pipe body 2 are connected, the output shaft of the first servo motor 10 drives the bidirectional screw 9 to rotate synchronously. The bidirectional screw 9 pushes the two claws 5 to slide along the limiting groove 8, so that the claws 5 move closer to each other and clamp the coupling 1. At this time, the clamping center line of the two claws 5 is the axis of the coupling 1. During the process of the two claws 5 moving towards each other, the two support blocks 6 will move towards 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. The insertion hole on the second arc block 12 is inserted into the insertion rod 13, which increases the connection strength. As the first arc block 11 moves, the two brackets 3 and the semi-circular block 14 move to the appropriate position.

[0053] Then, the oil pipe body 2 to be connected is moved between the first arc-shaped block 11 and the second arc-shaped block 12 using an external device (such as a lifting device). The output shaft of the second servo motor 1508 drives the lead screw 1509 to rotate on the bracket 3, causing the lead screw 1509 to drive 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. 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 component 16 is coaxial with the clamping center line of the two jaws 5, after clamping, the tapered thread groove of the coupling 1 is aligned with the center line of the tapered external thread on the outer peripheral wall of the oil pipe body 2, realizing thread alignment between the coupling 1 and the oil pipe body 2, improving the connection accuracy, enhancing the connection stability and reliability, reducing the risk of loosening caused by thread misalignment or even damage to the threads, and improving the connection effect of the gas-tight oil pipe.

[0054] When threaded connection is performed after thread alignment, the piston rod of the first hydraulic cylinder 1504 pulls the push block 1505 to separate the positioning pin 1506 from the positioning groove 1507. Then, the output shaft of the second servo motor 1508 drives the lead screw 1509 to push the connecting block 1501 and the slider 1502 to move along the bracket 3 towards the jaw 5, causing the clamped oil pipe body 2 to descend synchronously and rotate the oil pipe body 2 to be connected, so that the oil pipe body 2 gradually approaches 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. This facilitates the connection and use of the coupling 1 and the oil pipe body 2, and reduces the difficulty of operation and the error rate. 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 thread connection depth of the oil pipe body 2 and the coupling 1 can also be controlled to avoid over-tightening.

[0055] After the connection is completed, the jaw 5 is separated from the coupling 1, and the clamping assembly 16 is also separated from the tubing body 2. Both the jaw 5 and the clamping assembly 16 return to their initial positions.

[0056] Example 2

[0057] As shown in Figures 1, 4, 5, and 7, this embodiment is based on the previous embodiment, and adds the following structure to the first embodiment: the clamping assembly 16 includes two clamping plates 1602 slidably disposed on the U-shaped frame 1601. Multiple rotating columns 1603 are rotatably connected to the inner wall of the clamping plates 1602. The side wall of the slider 1502 is mounted with a second hydraulic cylinder 1605 corresponding to the clamping plates 1602 through a mounting seat. The piston rod of the second hydraulic cylinder 1605 passes through 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 towards the center, so that the clamping plate 1602 drives the rotating columns 1603 to abut against the outer wall of the oil pipe body 2.

[0058] Specifically, two positioning rods 1604 are fixed on the outer wall of the clamping plate 1602. The positioning rods 1604 extend through the U-shaped frame 1601 to the outside and are slidably connected to the U-shaped frame 1601.

[0059] During clamping, the piston rod of the second hydraulic cylinder 1605 pushes the clamping plate 1602 to move towards the center. 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 press the oil pipe body 2, which facilitates the thread alignment 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 facilitates the installation and use after clamping, improves the accuracy and efficiency of the threaded connection, ensures the stability and continuity of the installation process, and adapts to the clamping and use of couplings 1 and oil pipe bodies 2 with different diameters.

[0060] Example 3

[0061] As shown in Figures 1, 2, 9, and 10, this embodiment is based on Embodiment 1 or Embodiment 2, and adds the following structure: A lubrication assembly 17 is provided on the second support block. The lubrication assembly 17 includes a lifting block 1701, which is slidably mounted on the second support block. The lubrication assembly 17 also includes a first piston cylinder 1702, which is mounted on the second support block via a mounting base. 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. A hollow metal tube 1703 is slidably inserted into the lifting block 1701. A second piston cylinder 1714 is mounted on the side wall of the lifting block 1701 via a mounting base. A connecting rod 1715 is fixedly mounted on the outer end side wall of the hollow metal tube 1703. The piston rod of 714 is fixedly connected to the connecting rod 1715; the outer end of the hollow metal tube 1703 is connected to the vacuum fan 1704, and the outer peripheral wall of the inner end of the hollow metal tube 1703 is fixedly provided with a vacuum box 1705, the inside of the vacuum 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 vacuum box 1705 to move to engage with the tapered external thread of the oil pipe body 2; the vacuum fan 1704 transports the cleaned dust to the air outlet through the hollow metal tube 1703, and at this time, a dust collection bag is installed on the air outlet of the vacuum fan 1704, and the collected and cleaned dust is collected through the dust collection bag.

[0062] A cleaning roller 1706 is rotatably connected inside the dust collection box 1705. A third servo motor 1707 is mounted on the top surface of the dust collection box 1705 via a mounting base. The output shaft of the third servo motor 1707 is coaxially connected to the cleaning roller 1706. A scraping block 1708 is fixedly installed on the inner side wall of the dust collection box 1705. The cleaning roller 1706 is rotated 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 cleans the dust and impurities on the outer surface of the tapered external thread of the oil pipe body 2.

[0063] A distribution block 1709 is fixedly installed on the side wall of the dust collection box 1705. Multiple 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 pump 1712 is connected to the delivery hose 1711. The inlet end of the oil pump 1712 is connected to an inlet pipe 1713. The oil pump 1712 is installed on the top surface of the lifting block 1701 through a mounting base. The oil pump 1712 draws thread lubricating oil and delivers it to the inside of the distribution block 1709 through the delivery hose 1711. The oil is then sprayed onto the outer surface of the tapered external thread of the cleaned oil pipe body 2 through the nozzles 1710.

[0064] In the above process, before applying thread lubricant to the tapered external thread 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. Then, the piston rod of the second piston cylinder 1714 pushes the connecting rod 1715 to move. The connecting rod 1715 drives the hollow metal tube 1703 to slide along the lifting block 1701, causing the hollow metal tube 1703 to drive the dust collection box 1705 to move. After adjusting the dust collection box 1705 to a suitable distance from the tapered external thread 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 after cleaning is transported to the air outlet through the hollow metal tube 1703 by the dust suction fan 1704. At this time, a dust collection bag is installed on the air outlet of the dust suction fan 1704. The dust collected and cleaned is collected by the dust collection bag, which prevents the spread of dust and secondary pollution, and facilitates subsequent processing and cleaning.

[0065] When the sweeping roller 1706 rotates, the cleaning brush on the sweeping roller 1706 comes into contact with the scraping block 1708, knocking off the dust attached to the cleaning brush. The dust that has been knocked off is then sucked up by the dust collection box 1705, which reduces the impact of dust on the cleaning brush, extends the service life of the brush, and ensures continuous cleaning effect.

[0066] After cleaning, the thread lubricating oil is drawn in by the oil pump 1712 and delivered to the inside of the distribution block 1709 through the delivery hose 1711. It is then sprayed onto the outer surface of the tapered external thread of the cleaned oil pipe body 2 through the nozzle 1710, which facilitates the uniform application of thread lubricating oil, improves lubrication efficiency, reduces frictional resistance during thread connection, and prevents thread damage. This improves the connection quality and sealing between the coupling 1 and the oil pipe body 2. The nozzle 1710 sprays precisely to the target area, reducing the splashing and waste of thread lubricating oil, and also reducing pollution to the surrounding environment.

[0067] Working principle:

[0068] When the coupling 1 and the oil pipe body 2 are connected, the output shaft of the first servo motor 10 drives the bidirectional screw 9 to rotate synchronously. The bidirectional screw 9 pushes the two jaws 5 to slide along the limiting groove 8, so that the jaws 5 move closer to each other and clamp the coupling 1. At this time, the clamping center line of the two jaws 5 is the axis of the coupling 1. During the process of the two jaws 5 moving towards each other, the two support blocks 6 will move towards 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. The insertion hole on the second arc block 12 is inserted into the insertion rod 13, which increases the connection strength. As the first arc block 11 moves, the two brackets 3 and the semi-circular block 14 move to the appropriate position.

[0069] 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). The output shaft of the second servo motor 1508 drives the lead screw 1509 to rotate on the bracket 3, so that the lead screw 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. Then, the clamping assembly 1... 6. The non-threaded area of ​​the oil pipe body 2 to be connected is clamped. Since the clamping center line of the clamping component 16 is coaxial with the clamping center line of the two jaws 5, after clamping, the tapered thread groove of the coupling 1 is aligned with the center line of the tapered external thread on the outer peripheral wall of the oil pipe body 2, realizing thread alignment between the coupling 1 and the oil pipe body 2, improving the connection accuracy, enhancing the connection stability and reliability, reducing the risk of leakage caused by loosening or even damage to the threads due to thread misalignment, and improving the connection and use effect of the gas-tight oil pipe.

[0070] When threaded connection is performed after thread alignment, the piston rod of the first hydraulic cylinder 1504 pulls the push block 1505 to separate the positioning pin 1506 from the positioning groove 1507. Then, the output shaft of the second servo motor 1508 drives the lead screw 1509 to push the connecting block 1501 and the slider 1502 to move along the bracket 3 towards the jaw 5, causing the clamped oil pipe body 2 to descend synchronously and rotate the oil pipe body 2 to be connected, so that the oil pipe body 2 gradually approaches 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. This facilitates the connection and use of the coupling 1 and the oil pipe body 2, and reduces the difficulty of operation and the error rate. 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 thread connection depth of the oil pipe body 2 and the coupling 1 can also be controlled to avoid over-tightening. After the connection is completed, the jaw 5 is separated from the coupling 1, and the clamping assembly 16 is also separated from the tubing body 2. Both the jaw 5 and the clamping assembly 16 return to their initial positions.

[0071] In the above process, before applying thread lubricant to the tapered external thread 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. Then, the piston rod of the second piston cylinder 1714 pushes the connecting rod 1715 to move. The connecting rod 1715 drives the hollow metal tube 1703 to slide along the lifting block 1701, causing the hollow metal tube 1703 to drive the dust collection box 1705 to move. After adjusting the dust collection box 1705 to a suitable distance from the tapered external thread 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 after cleaning is transported to the air outlet through the hollow metal tube 1703 by the dust suction fan 1704. At this time, a dust collection bag is installed on the air outlet of the dust suction fan 1704. The dust collected and cleaned is collected by the dust collection bag, which prevents the spread of dust and secondary pollution, and facilitates subsequent processing and cleaning.

[0072] When the sweeping roller 1706 rotates, the cleaning brush on the sweeping roller 1706 comes into contact with the scraping block 1708, knocking off the dust attached to the cleaning brush. The dust that has been knocked off is then sucked up by the dust collection box 1705, which reduces the impact of dust on the cleaning brush, extends the service life of the brush, and ensures continuous cleaning effect.

[0073] After cleaning, the thread lubricating oil is drawn in by the oil pump 1712 and delivered to the inside of the distribution block 1709 through the delivery hose 1711. It is then sprayed onto the outer surface of the tapered external thread of the cleaned oil pipe body 2 through the nozzle 1710, which facilitates the uniform application of thread lubricating oil, improves lubrication efficiency, reduces frictional resistance during thread connection, and prevents thread damage. This improves the connection quality and sealing between the coupling 1 and the oil pipe body 2. The nozzle 1710 sprays precisely to the target area, reducing the splashing and waste of thread lubricating oil, and also reducing pollution to the surrounding environment.

[0074] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

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

2. The gas-tight oil pipe connection structure as described in claim 1, characterized in that: The top surface of the second support block is fixed with a second arc-shaped block (12). The first arc-shaped block (11) and the second arc-shaped block (12) are adapted to be connected by a docking device when the two claws (5) move toward each other. The docking device includes two insert rods (13) connected to both ends of the first arc-shaped block (11) and two insertion holes provided at both ends of the second arc-shaped block (12). The insertion holes are respectively inserted into the corresponding insert rods (13).

3. The gas-tight oil pipe connection structure as described in claim 2, characterized in that: The first support block has a semi-circular block (14) below the first arc-shaped block (11), and the top surfaces of the two ends of the semi-circular block (14) are respectively connected to the bottom surfaces of the corresponding brackets (3).

4. The gas-tight oil pipe connection structure as described in claim 3, characterized in that: The two jaws (5) are adapted to be driven to move in opposite directions or in opposite directions by a jaw drive mechanism. The jaw drive mechanism includes a mounting frame (7) with a limiting groove (8) on the mounting frame (7). The two jaws (5) are located inside the limiting groove (8). A bidirectional lead screw (9) is rotatably connected inside the limiting groove (8). The outer end of one jaw (5) is threaded to the forward thread section of the bidirectional lead screw (9) through a threaded hole. The outer end of the other jaw (5) is threaded to the reverse thread section of the bidirectional lead screw (9) through a threaded hole. A first servo motor (10) is mounted on the mounting frame (7) through a mounting base. The output shaft of the first servo motor (10) is coaxially connected to the bidirectional lead screw (9). The coupling (1) is provided with a sealing ring (4) near the axial edge inside, 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 gas-tight oil pipe connection structure as described in claim 1, characterized in that: The clamping assembly (16) includes two clamping plates (1602) slidably disposed on a U-shaped frame (1601). The inner wall of the clamping plate (1602) is rotatably connected to a plurality of rotating columns (1603). The side wall of the slider (1502) is mounted with a second hydraulic cylinder (1605) corresponding to the clamping plate (1602) via a mounting seat. The piston rod of the second hydraulic cylinder (1605) passes through the U-shaped frame (1601) and is fixedly connected to the corresponding clamping plate (1602).

6. The gas-tight oil pipe connection structure as described in claim 5, characterized in that: Two positioning rods (1604) are fixed on the outer wall of the clamping plate (1602). The positioning rods (1604) extend through the U-shaped frame (1601) to the outside and are slidably connected to the U-shaped frame (1601).

7. The gas-tight oil pipe connection structure as described in claim 1, characterized in that: The second support block is provided with a lubrication assembly (17), which includes a lifting block (1701) that is slidably mounted on the second support block (6). The lubrication assembly (17) also includes a first piston cylinder (1702), which is mounted on the second support block via a mounting base. 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). A hollow metal tube (1703) is slidably inserted into the lifting block (1701). The lifting block (1701) has a second piston cylinder (1714) mounted on its side wall via a mounting base. The outer end of the hollow metal tube (1703) is fixedly provided with a connecting rod (1715). 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 collector (1704). The outer peripheral wall of the inner end of the hollow metal tube (1703) is fixedly provided with a dust collection box (1705). The inside of the dust collection box (1705) is connected to the hollow metal tube (1703).

8. The gas-tight oil pipe connection structure as described in claim 7, characterized in that: The dust collection box (1705) is rotatably connected to a cleaning roller (1706). A third servo motor (1707) is mounted on the top surface of the dust collection box (1705) via a mounting base. The output shaft of the third servo motor (1707) is coaxially connected to the cleaning roller (1706). A scraping block (1708) is fixedly provided on the inner side wall of the dust collection box (1705). A distribution block (1709) is fixedly provided on the side wall of the dust collection box (1705). Multiple nozzles (1710) are connected to the inner side wall of the distribution block (1709). A conveying hose (1711) is connected to the distribution block (1709). An oil pump (1712) is connected to the conveying hose (1711). An inlet pipe (1713) is connected to the inlet end of the oil pump (1712). The oil pump (1712) is mounted on the top surface of the lifting block (1701) via a mounting base.

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