Variable-speed gear shifting mechanism of ultra-large torque coupling screw-on machine

Abstract

The utility model designs a variable-speed gear shifting mechanism of an ultra-large torque coupling screw-on machine, which comprises a hydraulic motor, a gearbox body, a flange gear, a sun gear, a planet gear, a planet carrier, an inner gear ring, a gear shifting mechanism and the like, the hydraulic motor is connected with the flange gear, a hydraulic motor shaft is connected with the sun gear, the sun gear is matched with the planet gear, and the planet carrier is connected with the gear shifting mechanism. And the inner gear ring is matched with the planet carrier and the flange gear, and the gear shifting mechanism slides back and forth to achieve switching of different gears. High-speed and low-speed switching of screwing can be achieved, the phenomenon of top rushing is avoided, meanwhile, small-torque high rotating speed and large-torque low rotating speed in the screwing process can be achieved, threads are protected, and working efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of the machinery industry and relates to a variable speed shifting mechanism for an ultra-high torque coupling screwing machine. Background Technology

[0002] The tightening process of oil casing couplings requires the participation of a tightening machine. The hydraulic system provides power to the hydraulic motor, which in turn drives the main jaw of the coupling tightening machine to rotate. The main jaw grips the coupling and rotates it to tighten it. Once the specified torque is reached, the main jaw releases, completing the tightening of the coupling. The tightening process requires the torque to reach a specified value from zero. This process is completed by the hydraulic system in conjunction with the motor power output, with real-time adjustment of the torque to gradually increase it.

[0003] Traditional coupling screwing machines lack a gear shifting mechanism, relying instead on hydraulic system pressure regulation to control torque variations. The control system, based on feedback from a torque sensor, gradually outputs pressure to drive a hydraulic motor and tighten the screwing machine's main clamp. This process can lead to overshooting when the torque reaches the specified value and the hydraulic system stops, potentially causing damage to the coupling in severe cases. Utility Model Content

[0004] This invention designs an ultra-high torque variable speed shifting mechanism for oil and gas field drilling and production casing coupling screwing machine, which can significantly improve the accuracy of coupling screwing torque while significantly reducing the impact of top impact.

[0005] To significantly improve the accuracy of coupling tightening torque while significantly reducing the impact of impact, and to solve the problem of uneven torque changes and poor torque accuracy control during oil casing coupling tightening, a variable speed shifting mechanism for this ultra-high torque coupling tightening machine was invented. Its structure consists of a square outer shell with a smooth outer surface and an internal gear structure.

[0006] The system comprises a gearbox housing with a smooth outer surface and an internal planetary gear carrier. A drive shaft is connected to the planetary gear carrier without relative rotation. Planetary gears are connected to the planetary gear carrier. A hydraulic motor is fixed to the outer wall of the gearbox housing via a flange gear. The hydraulic motor is connected to a sun gear inside the gearbox housing, driving the sun gear to rotate. An internal gear ring is located inside the gearbox housing, meshing with the planetary gears. The key feature is that the internal gear ring is connected to a shift mechanism that extends outside the gearbox housing, serving as the shifting operation end. The shift mechanism includes a shift ring that is fitted into the outer circle of the internal gear ring. The shifting operation end moves synchronously with the shift ring. When the shift ring is in the middle position (neutral), the drive shaft does not rotate. When the shift ring is in the forward position, the planetary gear carrier meshes with the internal gear ring, and the speed on the drive shaft is higher than the speed of the hydraulic motor. When the shift ring is in the rear position, the flange gear meshes with the internal gear ring, and the speed on the drive shaft is lower than the speed of the hydraulic motor.

[0007] The gearbox housing is provided with a bearing seat, bearing II, and bushing I. Bearing II is rotatably connected to the drive shaft (18), and bushing I is sleeved with the drive shaft.

[0008] The sun gear is connected to bushing II and pressure plate I.

[0009] The planetary gear carrier and the drive shaft are fastened together by pressure plate II and stop shims.

[0010] The planetary gear is connected to bearing I, and a planetary gear washer is provided between the planetary gear and the planetary gear carrier. The planetary gear is connected to the fixed shaft by a pin.

[0011] The outer wall of the gearbox body is equipped with an oil level indicator. One of the connection holes between the shift mechanism and the gearbox body is sealed by a cap, and the other is sealed by an O-ring and a through cap. The gearbox body has a gearbox cover, on which a breather is provided. The gearbox body is connected to a screw plug.

[0012] In summary, this utility model has the following advantages:

[0013] 1. For couplings requiring ultra-high torque tightening, a dedicated low-speed, high-torque setting is provided, enabling a smooth torque transition and precise tightening control, preventing hydraulic jerk at the end of the tightening process. This extends the service life of the hydraulic system. Simultaneously, the high-speed and low-speed settings cater to low-torque and high-torque requirements respectively, reducing production costs, increasing labor productivity, and enhancing the company's economic benefits.

[0014] 2. The structure is simple and the solution is easy to implement. Attached Figure Description

[0015] Figure 1 is a diagram showing the fit and connection of the parts in this utility model;

[0016] Figure 2 is a schematic diagram of the planetary gear train and shifting mechanism of this utility model;

[0017] Explanation of reference numerals in the attached drawings: 1. Bearing housing; 2. Gearbox body; 3. Bushing I; 4. Planetary gear carrier; 5. Internal gear ring; 6. Flange gear; 7. Sun gear; 8. Hydraulic motor; 9. Bushing II; 10. Pressure plate I; 11. Stop washer; 12. Pin; 13. Bearing I; 14. Planetary gear; 15. Pressure plate II; 16. Planetary gear washer; 17. Bearing II; 18. Drive shaft; 19. Oil level indicator; 20. Baffle; 21. Breather; 22. Shift ring; 23. Gearbox cover; 24. Transparent cover; 25. Shift mechanism; 26. O-ring; 27. Plug. Detailed Implementation

[0018] The high-torque coupling screwing machine features a variable-speed shifting mechanism. It includes a gearbox body 2 with a smooth outer surface and an internal planetary gear carrier 4. A drive shaft 18 is connected to the planetary gear carrier 4 without relative rotation. Planetary gears 14 are connected to the planetary gear carrier 4. A hydraulic motor 8 is fixed to the outer wall of the gearbox body 2 via a flange gear 6. The hydraulic motor 8 is connected to a sun gear 7 inside the gearbox body 2, driving the sun gear 7 to rotate. An internal gear ring 5 is located inside the gearbox body 2, meshing with the planetary gears 14. The key feature is that the internal gear ring 5 is connected to a shifting mechanism 25, which extends outside the gearbox body 2. The extended portion serves as the shifting operation end. The shifting mechanism 25 includes a shift ring 22, which is fitted into the outer circle of the internal gear ring 5. When the shifting operation end is subjected to force by the operator, it moves synchronously with the shift ring 22. When the shift ring 22 is in the middle and in neutral, the drive shaft 18 does not rotate. When the shift ring 22 is in the front position, the planetary gear carrier 4 meshes with the internal gear ring 5, and the speed of the drive shaft 18 is higher than the speed of the hydraulic motor 8. When the shift ring 22 is in the rear position, the flange gear 6 meshes with the internal gear ring 5, and the speed of the drive shaft 18 is lower than the speed of the hydraulic motor 8.

[0019] The gearbox housing 2 contains a bearing housing 1, a bearing II 17, and a bushing I 3. The bearing II 17 is rotatably connected to the drive shaft 18, and the bushing I 3 is fitted onto the drive shaft 18. The sun gear 7 is connected to the bushing II 9 and the pressure plate I 10. The planetary gear carrier 4 is fastened to the drive shaft 18 via the pressure plate II 15 and the retaining washer 11. The planetary gears 14 are connected to the bearing I 13, and a planetary gear washer 16 is provided between the planetary gears 14 and the planetary gear carrier 4. The planetary gears 14 are connected to the fixed shaft via the pin 12.

[0020] The outer wall of the gearbox body 2 is provided with an oil level indicator 19. The connection hole between the shift mechanism 25 and the gearbox body 2 is closed by one end cap 20 and the other by O-ring 26 and through cap 24. The gearbox body 2 has a gearbox cover 23, on which a breather 21 is provided. The gearbox body 2 is connected with a screw plug 27.

[0021] This utility model has three working states:

[0022] Neutral: When the shift mechanism 25 is in the initial state, the shift ring 22 is in the middle state. At this time, the hydraulic motor 8 drives the sun gear 7 to rotate, the sun gear 7 drives the planet gear 14 to rotate, and the internal gear ring 5 rotates around the sun gear. At this time, the planet carrier 4 does not rotate, and the power cannot be output to the drive shaft 18, so it is in the neutral state.

[0023] High speed: When the shift mechanism 25 is pressed down, the shift ring 22 is in the forward position. At this time, the planetary gear carrier 4 meshes with the internal ring gear 5, the hydraulic motor 8 drives the sun gear 7 to rotate, the sun gear 7 drives the planetary gears 14 and the planetary gear carrier 4 to rotate, the internal ring gear 5 does not rotate, and the power is finally output to the drive shaft 18. At this time, due to the speed transmission and conversion ratio of the planetary gear system, the speed on the drive shaft 18 is higher than the speed of the hydraulic motor 8, realizing the output of high speed and low torque.

[0024] Low gear: When the shift mechanism 25 is lifted, the shift ring 22 is in the rear position. At this time, the flange gear 6 meshes with the internal gear ring 5, the hydraulic motor 8 drives the sun gear 8 to rotate, the sun gear 8 drives the planet gears 14 and the planet gear carrier 4 to rotate, the internal gear ring 5 rotates, and the power is finally output to the drive shaft 18. At this time, the speed on the drive shaft 18 is lower than the speed of the hydraulic motor 8, realizing the output of high torque in low gear.

Claims

1. A variable speed shifting mechanism for a high-torque coupling screwing machine, comprising a gearbox body (2) with a smooth outer surface and a planetary gear carrier (4) inside. A drive shaft (18) is connected to the planetary gear carrier (4) without relative rotation. Planetary gears (14) are connected to the planetary gear carrier (4). A hydraulic motor (8) is fixed to the outer wall of the gearbox body (2) via a flange gear (6). The hydraulic motor (8) is connected to a sun gear (7) inside the gearbox body (2) to drive the sun gear (7) to rotate. An internal gear ring (5) is inside the gearbox body (2), and the internal gear ring (5) meshes with the planetary gears (14). Its characteristic is that... The internal gear ring (5) is connected to the shift mechanism (25). The shift mechanism (25) extends outside the gearbox body (2). The extended part serves as the shift operation end. The shift mechanism (25) is equipped with a shift ring (22). The shift ring (22) and the outer circle of the internal gear ring (5) are connected in an interlocking manner. The shift operation end moves synchronously with the shift ring (22). When the shift ring (22) is in the middle and in neutral, the drive shaft (18) does not rotate. When the shift ring (22) is in the front position, the planetary gear carrier (4) meshes with the internal gear ring (5). The speed on the drive shaft (18) is higher than the speed of the hydraulic motor (8). When the shift ring (22) is in the rear position, the flange gear (6) meshes with the internal gear ring (5). The speed on the drive shaft (18) is lower than the speed of the hydraulic motor (8).

2. The variable speed shifting mechanism for the ultra-high torque coupling screwing machine according to claim 1, characterized in that, The gearbox body (2) is equipped with a bearing seat (1), bearing II (17), and bushing I (3). Bearing II (17) is rotatably connected to the drive shaft (18), and bushing I (3) is sleeved with the drive shaft (18).

3. The variable speed shifting mechanism of the ultra-high torque coupling screwing machine according to claim 1, characterized in that, The sun gear (7) is connected to bushing II (9) and pressure plate I (10).

4. The variable speed shifting mechanism of the ultra-high torque coupling screwing machine according to claim 1, characterized in that, The planetary gear carrier (4) and the drive shaft (18) are fastened together by pressure plate II (15) and stop washer (11).

5. The variable speed shifting mechanism for the ultra-high torque coupling screwing machine according to claim 1, characterized in that, The planetary gear (14) is connected to the bearing I (13), and a planetary gear washer (16) is provided between the planetary gear (14) and the planetary gear carrier (4). The planetary gear (14) is connected to the fixed shaft by the pin (12).

6. The variable speed shifting mechanism of the ultra-high torque coupling screwing machine according to claim 1, characterized in that, The outer wall of the gearbox body (2) is provided with an oil level indicator (19). The connection hole between the shift mechanism (25) and the gearbox body (2) is closed by a cap (20) and the other by an O-ring (26) and a cover (24). The gearbox body (2) has a gearbox cover (23), and a breather (21) is provided on the gearbox cover (23). The gearbox body (2) is connected with a screw plug (27).

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