Bent nipple for screw drill

Abstract

The utility model provides a bent short section for a screw drill, which belongs to the technical field of screw drills, comprises an anti-falling short section and an anti-falling rod, and is characterized in that the anti-falling rod is positioned in an inner cavity of the anti-falling short section, the upper end of the anti-falling rod is in threaded connection with an anti-falling screw cap, a limiting clamping ring is arranged outside the anti-falling screw cap, and the limiting clamping ring is connected with the anti-falling rod. The limiting clamping ring is matched with an inverted-cone-shaped limiting table arranged in an inner cavity of the anti-falling short section, a limiting mechanism used for limiting the anti-falling nut is arranged at the upper end of the anti-falling rod, the limiting mechanism comprises a plurality of rectangular sliding grooves annularly and evenly formed in the upper end of the outer arc face of the anti-falling rod, and limiting plates are slidably connected into the rectangular sliding grooves correspondingly. Limiting grooves are formed in the positions, close to the rectangular sliding grooves, of the inner arc face of the anti-falling nut. By means of the limiting mechanism, the problem that the anti-falling strength is low due to the fact that the anti-falling nut and the anti-falling rod are in threaded connection only under the normal condition is solved, the connecting strength of the anti-falling nut and the anti-falling rod is remarkably improved, and the overall anti-falling effect of the bent short section is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw drill tools, and in particular relates to a curved short section for a screw drill tool. Background Art

[0002] A screw drill, also known as an auger drill or auger drill rod, is a drilling tool used in the oil drilling industry. It is primarily used to provide rotational power to drive the drill bit for drilling operations. Currently, in order to prevent the drill tool from being disconnected or broken, thus preventing the drill tool from descending, a special curved short section for the screw drill is usually used to safely bring the drill tool below to the surface.

[0003] Existing curved subs for screw drills typically consist of a locking nut, an extension shaft, and a protective joint. The locking nut cooperates with a stopper boss within the curved sub to prevent the drill housing from descending in the event of a break or rupture, thereby preventing it from falling. However, this design relies solely on the threaded connection strength of the locking nut to prevent it from falling, resulting in a low level of strength and a limited effectiveness in preventing the curved sub from falling. Utility Model Content

[0004] In view of this, the utility model provides a curved short section for screw drilling tools, which can solve the problem of low anti-drop strength caused by relying solely on the threaded connection of the anti-drop nut and the anti-drop rod under conventional circumstances through a limiting mechanism, significantly improves the connection strength of the anti-drop nut and the anti-drop rod, and enhances the overall anti-drop effect of the curved short section.

[0005] In order to solve the above technical problems, the utility model provides a curved short section for screw drilling tools, including an anti-drop short section and an anti-drop rod, which is characterized in that: the anti-drop rod is located in the inner cavity of the anti-drop short section, the upper end of the anti-drop rod is threadedly connected to an anti-drop nut, the outside of the anti-drop nut is provided with a limiting clamping ring, the limiting clamping ring is matched with the inverted cone-shaped limiting platform provided in the inner cavity of the anti-drop short section, the upper end of the anti-drop rod is provided with a limiting mechanism for limiting the anti-drop nut, the limiting mechanism includes a plurality of rectangular slide grooves uniformly arranged on the upper end of the outer arc surface of the anti-drop rod, the rectangular slide grooves are all slidably connected to the limiting plates, and the anti-drop The inner arc surface of the nut is provided with a limit groove near each rectangular slide groove, the outer end of the limit plate is respectively matched with the adjacent limit groove on the same side, the upper end of the anti-drop rod is provided with a threaded groove, and the threaded inner groove is connected with a locking bolt, the inner end of the limit plate is matched with the locking bolt, and the upper end of the anti-drop nut is provided with a through hole compatible with the locking bolt, which solves the problem of low anti-drop strength caused by relying solely on the threaded connection of the anti-drop nut and the anti-drop rod under normal circumstances, significantly improves the connection strength of the anti-drop nut and the anti-drop rod, and improves the overall anti-drop effect of the bent short section.

[0006] It also includes a reset component, which is used to reset the limit plate. The reset component includes springs respectively arranged in the limit slots, and the springs are respectively arranged in conjunction with the limit plates located in the same limit slot, that is.

[0007] The reset assembly also includes top plates respectively arranged on the inner ends of the springs, and the top plates are respectively arranged in cooperation with the limit plates located in the same limit groove, that is, ensuring that the limit plates can be automatically reset.

[0008] The upper end of the anti-drop nut is provided with a countersunk groove adapted to the locking bolt, thereby ensuring the sealing of the connection.

[0009] A sealing gasket is arranged in the countersunk groove, and an annular groove matched with the sealing gasket is arranged on the locking bolt, so that the overall appearance is smoother and more beautiful.

[0010] A plurality of balls evenly distributed in an annular shape are rotatably connected to the inverted conical limit platform provided in the inner cavity of the anti-drop short section. The balls are all matched with the limit clamping ring to reduce the friction on the limit clamping ring.

[0011] The inner ends of the limiting plates are all arranged to be tilted downward from the outside to the inside, that is, to ensure that when the locking bolt and the limiting plate come into contact, both can slide smoothly.

[0012] The beneficial effects of the above technical solution of the utility model are as follows:

[0013] The cam is then tightened to prevent the cam from falling out of the gear, and the cam is then tightened to prevent the cam from falling out of the gear.

[0014] 2. When disassembly is required, reverse the above steps. When the locking bolt is no longer in contact with the limit plate, the spring will rebound immediately and push the corresponding limit plate back into the rectangular slot through the top plate to ensure that the limit plate can be automatically reset.

[0015] 3. The inverted conical limit platform set in the inner cavity of the drop joint is equipped with multiple balls that cooperate with the limit snap ring to reduce the friction on the limit snap ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of a curved short section for a screw drill tool according to the present invention;

[0017] Figure 2 This is a schematic cross-sectional view of the utility model;

[0018] Figure 3 This is an enlarged structural diagram of point A of the present utility model;

[0019] Figure 4 This is a schematic structural diagram of the working state of the limiting mechanism of the utility model.

[0020] Explanation of the accompanying reference numerals: 100, anti-drop short section; 200, anti-drop rod; 300, anti-drop nut; 400, limiting snap ring; 500, rectangular slide groove; 501, limiting plate; 502, limiting groove; 503, threaded groove; 504, locking bolt; 600, spring; 601, top plate; 700, countersunk groove; 800, sealing gasket; 900, ball bearing. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiment of the present invention clearer, the following will be combined with the appended drawings of the embodiment of the present invention. Figure 1-4 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention.

[0022] This embodiment provides a curved short section for a screw drill, such as Figure 1-4 As shown: It includes an anti-drop short section 100 and an anti-drop rod 200, which is characterized in that: the anti-drop rod 200 is located in the inner cavity of the anti-drop short section 100, the upper end of the anti-drop rod 200 is threadedly connected with an anti-drop nut 300, and the outer portion of the anti-drop nut 300 is provided with a limiting snap ring 400, which is matched with the inverted cone-shaped limiting platform provided in the inner cavity of the anti-drop short section 100. The upper end of the anti-drop rod 200 is provided with a limiting mechanism for limiting the anti-drop nut 300, and the limiting mechanism includes a plurality of rectangular slide grooves uniformly arranged on the upper end of the outer arc surface of the anti-drop rod 200. 500, the rectangular slide grooves 500 are all slidably connected with limit plates 501, and the inner arc surface of the anti-drop nut 300 is provided with a limit groove 502 near each rectangular slide groove 500, and the outer ends of the limit plates 501 are respectively matched with the limit grooves 502 adjacent to the same side, and the upper end of the anti-drop rod 200 is provided with a threaded groove 503, and the inner thread of the threaded groove 503 is connected with a locking bolt 504, and the inner ends of the limit plates 501 are matched with the locking bolt 504, and the upper end of the anti-drop nut 300 is provided with a through hole adapted to the locking bolt 504.

[0023] First, insert the anti-drop rod 200 into the inner cavity of the anti-drop short section 100, and connect its lower end to the motor rotor, then tighten the anti-drop nut 300 to the upper end of the anti-drop rod 200, so that the limiting clamping ring 400 cooperates with the inverted conical limiting platform set in the inner cavity of the anti-drop short section 100 to ensure that the anti-drop short section 100 will not fall off, then tighten the locking bolt 504, and in the process of screwing the locking bolt 504 into the thread groove 503, the lower end of the locking bolt 504 will contact the inclined surface of the inner end of the limiting plate 501, and as the locking bolt 504 is screwed into the thread groove 503, the lower end of the locking bolt 504 will contact the inclined surface of the inner end of the limiting plate 501. As 04 continues to rotate in, the limit plate 501 will press against the top plate 601 and overcome the elastic force of the spring 600 to move into the corresponding limit groove 502, and finally the outer end of the limit plate 501 will extend into the corresponding limit groove 502, thereby locking the anti-drop nut 300, solving the problem of low anti-drop strength caused by relying solely on the threaded connection between the anti-drop nut 300 and the anti-drop rod 200 under conventional circumstances, significantly improving the connection strength between the anti-drop nut 300 and the anti-drop rod 200, and improving the overall anti-drop effect of the bent short section.

[0024] like Figure 2-4 As shown, a reset component is also included, which is used to reset the limit plate 501. The reset component includes springs 600 respectively arranged in the limit grooves 502. The springs 600 are respectively arranged in conjunction with the limit plates 501 located in the same limit groove 502.

[0025] like Figure 2-4 As shown, the reset assembly also includes top plates 601 respectively arranged on the inner ends of the springs 600. The top plates 601 are respectively cooperated with the limit plates 501 located in the same limit groove 502. When disassembly is required, the above steps are reversed. When the locking bolt 504 is no longer in contact with the limit plate 501, the spring 600 rebounds immediately and pushes the corresponding limit plate 501 back into the rectangular slide groove 500 through the top plate 601, ensuring that the limit plate 501 can be automatically reset. The design of the top plate 601 can make the rebound force of the spring 600 more evenly applied to the limit plate 501.

[0026] like Figure 2-4 As shown, the upper end of the anti-drop nut 300 is provided with a countersunk groove 700 adapted to the locking bolt 504, and the sealing gasket 800 is engaged with the annular groove to ensure the sealing of the connection.

[0027] like Figure 2-4 As shown, a sealing gasket 800 is provided in the countersunk groove 700, and an annular groove adapted to the sealing gasket 800 is provided on the locking bolt 504. The design of the countersunk groove 700 can prevent the locking bolt 504 from protruding, reducing the risk of scratches or hooking, making the overall appearance smoother and more beautiful.

[0028] like Figure 2-4As shown, a plurality of balls 900 evenly distributed in a ring are rotatably connected to the inverted conical limit platform provided in the inner cavity of the anti-drop short section 100, and the balls 900 are all provided in conjunction with the limit snap ring 400. The plurality of balls 900 on the inverted conical limit platform provided in the inner cavity of the anti-drop short section 100 cooperate with the limit snap ring 400 to reduce friction on the limit snap ring 400.

[0029] like Figure 2-4 As shown, the inner ends of the limiting plate 501 are tilted downward from the outside to the inside to ensure that when the locking bolt 504 contacts the limiting plate 501, both can slide smoothly.

[0030] The working principle of the bending short section of the screw drilling tool provided by the utility model is as follows: first, the anti-drop rod 200 is inserted into the inner cavity of the anti-drop short section 100, and its lower end is connected to the motor rotor, and then the anti-drop nut 300 is tightened to the upper end of the anti-drop rod 200, so that the limiting clamping ring 400 cooperates with the inverted cone limiting platform set in the inner cavity of the anti-drop short section 100 to ensure that the anti-drop short section 100 will not fall off. Subsequently, the locking bolt 504 is tightened, and the locking bolt 504 is screwed into the thread groove 503. The lower end of the locking bolt 504 will contact the inclined surface of the inner end of the limiting plate 501. As the locking bolt 504 is continuously screwed in, the limiting plate 501 will support the top plate 601 and overcome the elastic force of the spring 600 to move into the corresponding limiting groove 502, thereby finally making the outer end of the limiting plate 501 extend into the corresponding limiting groove 502, thereby achieving the locking of the anti-drop nut 300, solving the problem When the locking bolt 504 is no longer in contact with the limit plate 501, the spring 600 immediately rebounds and pushes the corresponding limit plate 501 back into the rectangular slot 500 through the top plate 601 to ensure that the limit plate 501 can automatically reset. The design of the countersunk groove 700 can prevent the locking bolt 504 from protruding, reducing the risk of scratching or hooking, making the overall appearance smoother and more beautiful. At the same time, the sealing gasket 800 is engaged with the annular groove to ensure the sealing of the connection. The inverted conical limit platform set in the inner cavity of the anti-drop short section 100 is provided with a plurality of balls 900 that cooperate with the limit snap ring 400 to reduce the friction on the limit snap ring 400.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bending sub for a screw drill, comprising an anti-drop sub (100) and an anti-drop rod (200), characterized in that: The anti-drop rod (200) is located in the inner cavity of the anti-drop short section (100), and the upper end of the anti-drop rod (200) is threadedly connected to the anti-drop nut (300), and the outer portion of the anti-drop nut (300) is provided with a limiting snap ring (400), and the limiting snap ring (400) is arranged in cooperation with the inverted conical limiting platform arranged in the inner cavity of the anti-drop short section (100). The upper end of the anti-drop rod (200) is provided with a limiting mechanism for limiting the anti-drop nut (300), and the limiting mechanism includes a plurality of rectangular slide grooves (500) uniformly arranged in an annular manner on the upper end of the outer arc surface of the anti-drop rod (200), and the rectangular slide grooves (500) are uniformly arranged in an annular manner. The sliding connection is provided with a limit plate (501), and the inner arc surface of the anti-drop nut (300) is provided with a limit groove (502) near each rectangular slide groove (500), and the outer end of the limit plate (501) is respectively matched with the limit groove (502) adjacent to the same side, and the upper end of the anti-drop rod (200) is provided with a thread groove (503), and the inner thread of the thread groove (503) is connected with a locking bolt (504), and the inner end of the limit plate (501) is matched with the locking bolt (504), and the upper end of the anti-drop nut (300) is provided with a through hole adapted to the locking bolt (504).

2. A curved sub for a screw drill according to claim 1, characterized in that: The invention also includes a reset component, which is used to reset the limit plate (501). The reset component includes springs (600) respectively arranged in the limit grooves (502). The springs (600) are respectively arranged in conjunction with the limit plates (501) located in the same limit groove (502).

3. A curved sub for a screw drill according to claim 2, characterized in that: The reset assembly further comprises top plates (601) respectively arranged at the inner ends of the springs (600), and the top plates (601) are respectively arranged in cooperation with the limiting plates (501) located in the same limiting groove (502).

4. The curved sub for a screw drill according to claim 1, characterized in that: The upper end of the anti-drop nut (300) is provided with a countersunk groove (700) adapted to the locking bolt (504).

5. The curved sub for a screw drill according to claim 4, characterized in that: A sealing gasket (800) is provided in the countersunk groove (700), and an annular groove adapted to the sealing gasket (800) is provided on the locking bolt (504).

6. The curved sub for a screw drill according to claim 1, characterized in that: A plurality of balls (900) evenly distributed in an annular shape are rotatably connected to an inverted conical limiting platform provided in the inner cavity of the anti-drop short section (100), and the balls (900) are all arranged in cooperation with the limiting clamping ring (400).

7. The curved sub for a screw drill according to claim 1, characterized in that: The inner ends of the limiting plates (501) are all arranged to be tilted downward from the outside to the inside.

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