Long stroke oil well pumping unit

Abstract

The application discloses a long-stroke oil well pumping device, which comprises a platform, a transmission device, a rope winding device and a reversing device fixed on the platform; the transmission device comprises a motor and a protective cover, the motor is connected with a gearbox, the gearbox is connected with a small chain wheel, a roller is arranged on the protective cover through two bearing seats a, a large chain wheel and a brake support arm are arranged at both ends of the roller, and the small chain wheel and the large chain wheel are connected through a chain; the rope winding device comprises a rope winding support, and a rope winding device is arranged on the rope winding support; the reversing device comprises a support, a headstock lower plate is fixed on the support, a through hole is formed in the support along the direction of the support near the end face of the support, a mandrel is arranged in the through hole, one end of the mandrel abuts against the end face of the support, the other end of the mandrel penetrates through a headstock upper plate, and a headstock pulley is arranged on the headstock upper plate; the motor, the protective cover and the rope winding support are fixed on the platform, and the reversing device is arranged at one end of the platform close to the rope winding device. The oil pumping device has the characteristics of low energy consumption, high efficiency and small size.

Description

Technical Field

[0001] This invention belongs to the technical field of oilfield extraction equipment and relates to a long-stroke oil well pumping device. Background Technology

[0002] With the extension of oilfield development time, the development of "low-permeability, low-fluid-supply, and low-volume oilfields" is increasing. These fields suffer from low crude oil permeability, insufficient downhole fluid supply, and continuous operation with conventional pumping units, resulting in low pump efficiency and significant energy waste. Currently, to achieve reasonable production of low-yield oil wells, the common methods employed are reducing pumping unit stroke rate, using smaller pump diameters, intermittent pumping operations, and oil retrieval operations. The pumping units utilize an "8-pole motor + high speed ratio + frequency converter" control system to achieve stroke rates ranging from 1.5 to 5 strokes per minute. However, this approach is not well-suited for oil wells with very low fluid volumes, exhibiting limitations and resulting in high energy consumption, high operating and maintenance costs, and significant management difficulties. Traditional pumping units suffer from poor operational flexibility, insufficient exploitation of intermittent pumping energy-saving potential, and low system efficiency. In recent years, a retrieval-type pumping unit has been developed domestically. However, this type of pumping unit is bulky, requires a large footprint, has a complex structure, and is expensive.

[0003] To reduce the production cost of low-yield oil wells and achieve the goals of energy conservation, emission reduction, safety, and environmental protection, the search for intermittent oil production operation devices for low-yield oil wells that are simple in structure, occupy a small area, are easy to install, easy to manufacture, and reliable is one of the topics of concern to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a long-stroke oil well pumping device that solves the problems of high energy consumption, low efficiency and large footprint of existing pumping units.

[0005] The technical solution adopted in this invention is a long-stroke oil well pumping device, including a platform, on which a transmission device, a rope winding device and a reversing device are fixed.

[0006] The transmission device includes an electric motor and a protective cover. The output shaft of the electric motor is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to a small sprocket via a coupling. Two bearing seats a are fixed to the upper surface of the protective cover by bolts. A roller is installed between the two bearing seats a via a roller shaft. A large sprocket and a brake arm are respectively installed at both ends of the roller shaft. The small sprocket and the large sprocket are connected by a chain.

[0007] The rope coiling device includes a rope coiling bracket, which fixes the pulley shaft through a pulley shaft support, and the pulley shaft is fitted with a rope coiler.

[0008] The reversing device includes a bracket, on which a lower trolley plate is fixed by bolts. A through hole is opened along the direction of the bracket at the end face of the lower trolley plate near the bracket. A spindle is installed in the through hole through a tapered roller ball bearing. One end of the spindle abuts against the end face of the bracket, and the other end passes through the upper trolley plate. A trolley pulley support is fixed to the upper trolley plate by screws. A trolley pulley is installed on the trolley pulley support through a bearing seat b.

[0009] The motor, protective cover, and rope coiling bracket are fixed to the platform via a base, and the reversing device is located at one end of the platform near the rope coiling device.

[0010] The invention is further characterized by:

[0011] The brake arm is connected to the hydraulic thruster.

[0012] The motor is fixed to the base by the motor base, and an encoder is also installed on the output shaft of the motor.

[0013] The outer edge of the rope coiler is equipped with a track.

[0014] A flexible sucker rod is wound around the drum. The other end of the flexible sucker rod passes through a rope coiler and a gantry pulley in sequence, and is connected to a blowout preventer. The other end of the blowout preventer is connected to a wellhead sealing device and a wellhead device in sequence.

[0015] The bearing housing b is fixed with a rope-blocking device by bolts on the upper part of the overhead crane pulley.

[0016] A one-way thrust ball bearing a is sleeved between the upper plate and the lower plate of the gantry crane. The upper plate and the lower plate of the gantry crane have a groove a along the long side at the end away from the support. A one-way thrust ball bearing b with a groove b is fitted between the upper plate and the lower plate of the gantry crane. Baffles are provided on both ends of the groove b.

[0017] A diagonal brace is installed between the support frame and the platform. One end of the diagonal brace is fixed to the support frame by bolts and fixing plate a, and the other end of the diagonal brace is fixed to the platform by bolts and fixing plate b.

[0018] A support device is installed between the bracket and the lower plate of the gantry crane, with both ends of the support device fixed to the bracket and the lower plate of the gantry crane, respectively.

[0019] The beneficial effects of this invention are as follows: The long-stroke oil well pumping device adopts skid-mounted integration and fixed installation. Compared with existing low-yield oil well production equipment and methods, this invention's pumping device, composed of transmission devices, rope coiling devices, and reversing devices, can be installed without a cement foundation. It features small size, compact and simple structure, energy saving and consumption reduction, safety and environmental protection, easy transportation, and convenient use and manufacturing. It is particularly suitable for intermittent production operations of low-yield oil wells in oilfield production processes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the long-stroke oil well pumping device of the present invention;

[0021] Figure 2 This is a schematic diagram of the electric motor in the oil extraction device of the present invention.

[0022] In the diagram, 1. Platform, 2. Base a, 3. Base b, 4. Motor base, 5. Motor, 6. Small sprocket, 7. Chain, 8. Protective cover, 9. Large sprocket, 10. Roller, 11. Flexible sucker rod, 12. Rope coiling bracket, 13. Rope coiler, 14. Pulley shaft, 15. Brake support arm, 16. Hydraulic thruster, 17. Tie rod, 18. Fixed plate a, 19. Crane lower plate, 20. Tapered roller ball bearing, 21. One-way thrust ball bearing a, 22. Crane pulley support, 23. Rope blocking device, 24. Crane pulley, 25. Mandrel, 26. Crane upper plate, 27. One-way thrust ball bearing b, 28. Support device, 29. Blowout preventer, 30. Wellhead sealing device, 31. Bracket, 32. Wellhead device, 33. Fixed plate b, 34. Coupling, 35. Gearbox. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] The present invention relates to a long-stroke oil well pumping device, such as... Figure 1 As shown, it includes a platform 1, on which a transmission device, a rope winding device, and a reversing device are fixed.

[0026] The transmission device includes a motor 5 and a protective cover 8. The output shaft of the motor 5 is connected to the input shaft of the gearbox 35. The output shaft of the gearbox 35 is connected to the small sprocket 6 through a coupling 34. Two bearing seats a are fixed to the upper surface of the protective cover 8 by bolts. A roller 10 is set between the two bearing seats a through a roller shaft. A large sprocket 9 and a brake arm 15 are respectively set at both ends of the roller 10. The small sprocket 6 and the large sprocket 9 are connected by a chain 7.

[0027] The rope coiling device includes a rope coiling bracket 12, which fixes a pulley shaft 14 through a pulley shaft support, and a rope coiler 13 is mounted on the pulley shaft 14.

[0028] The reversing device includes a bracket 31, to which a lower crane plate 19 is bolted. A through hole is formed on the lower crane plate 19 near the end face of the bracket 31, along the direction of the bracket 31. A spindle 25 is mounted within the through hole via a tapered roller ball bearing 20. One end of the spindle 25 abuts against the end face of the bracket 31, and the other end passes through an upper crane plate 26. An upper crane plate 26 is fixed to a crane pulley support 22 via screws. A crane pulley 24 is mounted on the crane pulley support 22 via a bearing seat b. The crane pulley 24, spindle 25, upper crane plate 26, and crane pulley support 22 are integrated and can swing left and right on a one-way thrust ball bearing b27. There is a certain gap between the upper crane plate 26 and the lower crane plate 19. A bearing assembly is installed eccentrically to the left of the centerline of the lower crane plate 19.

[0029] As the pulley shaft 14 rotates with the drum 10 and the flexible sucker rod 11, it slides left and right along the pulley guide shaft, causing the flexible sucker rod 11 to swing left and right, which in turn drives the overhead crane plate 26 and the pulley assembly to rotate left and right, thus realizing the orderly multi-layer coiling of the flexible sucker rod 11 on the drum 10.

[0030] The motor 5, protective cover 8 and rope coiling bracket 12 are fixed to the platform 1 by the base. The reversing device is located at one end of the platform 1 near the rope coiling device. The base consists of two stacked bases a2 and b3, which are fixed together by bolts. The motor 5, protective cover 8 and rope coiling bracket 12 are specifically fixed to the base b3, and the base a2 is fixed to the platform 1.

[0031] Example 2

[0032] The present invention relates to a long-stroke oil well pumping device, such as... Figure 1 , Figure 2 As shown, it includes a platform 1, on which a transmission device, a rope winding device, and a reversing device are fixed.

[0033] The transmission device includes a motor 5 and a protective cover 8. The output shaft of the motor 5 is connected to the input shaft of the gearbox 35. The output shaft of the gearbox 35 is connected to the small sprocket 6 through a coupling 34. Two bearing seats a are fixed to the upper surface of the protective cover 8 by bolts. A roller 10 is set between the two bearing seats a through a roller shaft. A large sprocket 9 and a brake arm 15 are respectively set at both ends of the roller 10. The small sprocket 6 and the large sprocket 9 are connected by a chain 7.

[0034] The rope coiling device includes a rope coiling bracket 12, which fixes a pulley shaft 14 through a pulley shaft support, and a rope coiler 13 is mounted on the pulley shaft 14.

[0035] The reversing device includes a bracket 31, to which a lower crane plate 19 is bolted. A through hole is formed on the lower crane plate 19 near the end face of the bracket 31, along the direction of the bracket 31. A spindle 25 is mounted within the through hole via a tapered roller ball bearing 20. One end of the spindle 25 abuts against the end face of the bracket 31, and the other end passes through an upper crane plate 26. An upper crane plate 26 is fixed to a crane pulley support 22 via screws. A crane pulley 24 is mounted on the crane pulley support 22 via a bearing seat b. The crane pulley 24, spindle 25, upper crane plate 26, and crane pulley support 22 are integrated and can swing left and right on a one-way thrust ball bearing b27. There is a certain gap between the upper crane plate 26 and the lower crane plate 19. A bearing assembly is installed eccentrically to the left of the centerline of the lower crane plate 19.

[0036] As the pulley shaft 14 rotates with the drum 10 and the flexible sucker rod 11, it slides left and right along the pulley guide shaft, causing the flexible sucker rod 11 to swing left and right, which in turn drives the overhead crane plate 26 and the pulley assembly to rotate left and right, thus realizing the orderly multi-layer coiling of the flexible sucker rod 11 on the drum 10.

[0037] The motor 5, protective cover 8 and rope coiling bracket 12 are fixed to the platform 1 by the base. The reversing device is located at one end of the platform 1 near the rope coiling device. The base consists of two stacked bases a2 and b3, which are fixed together by bolts. The motor 5, protective cover 8 and rope coiling bracket 12 are specifically fixed to the base b3, and the base a2 is fixed to the platform 1.

[0038] Brake arm 15 is connected to hydraulic thruster 16. Motor 5 is fixed to base via motor base 4. An encoder is also provided on the output shaft of motor 5. Motor 5 uses switched reluctance motor or other motors that realize commutation function and control system to perform speed control of oil pumping device of the present invention. The encoder on the output shaft of motor 5 can calculate the current layer number based on the count change.

[0039] Example 3

[0040] The present invention relates to a long-stroke oil well pumping device, such as... Figure 1 , Figure 2 As shown, it includes a platform 1, on which a transmission device, a rope winding device, and a reversing device are fixed.

[0041] The transmission device includes a motor 5 and a protective cover 8. The output shaft of the motor 5 is connected to the input shaft of the gearbox 35. The output shaft of the gearbox 35 is connected to the small sprocket 6 through a coupling 34. Two bearing seats a are fixed to the upper surface of the protective cover 8 by bolts. A roller 10 is set between the two bearing seats a through a roller shaft. A large sprocket 9 and a brake arm 15 are respectively set at both ends of the roller 10. The small sprocket 6 and the large sprocket 9 are connected by a chain 7.

[0042] The rope coiling device includes a rope coiling bracket 12, which fixes a pulley shaft 14 through a pulley shaft support, and a rope coiler 13 is mounted on the pulley shaft 14.

[0043] The reversing device includes a bracket 31, to which a lower crane plate 19 is bolted. A through hole is formed on the lower crane plate 19 near the end face of the bracket 31, along the direction of the bracket 31. A spindle 25 is mounted within the through hole via a tapered roller ball bearing 20. One end of the spindle 25 abuts against the end face of the bracket 31, and the other end passes through an upper crane plate 26. An upper crane plate 26 is fixed to a crane pulley support 22 via screws. A crane pulley 24 is mounted on the crane pulley support 22 via a bearing seat b. The crane pulley 24, spindle 25, upper crane plate 26, and crane pulley support 22 are integrated and can swing left and right on a one-way thrust ball bearing b27. There is a certain gap between the upper crane plate 26 and the lower crane plate 19. A bearing assembly is installed eccentrically to the left of the centerline of the lower crane plate 19.

[0044] As the pulley shaft 14 rotates with the drum 10 and the flexible sucker rod 11, it slides left and right along the pulley guide shaft, causing the flexible sucker rod 11 to swing left and right, which in turn drives the overhead crane plate 26 and the pulley assembly to rotate left and right, thus realizing the orderly multi-layer coiling of the flexible sucker rod 11 on the drum 10.

[0045] The motor 5, protective cover 8 and rope coiling bracket 12 are fixed to the platform 1 by the base. The reversing device is located at one end of the platform 1 near the rope coiling device. The base consists of two stacked bases a2 and b3, which are fixed together by bolts. The motor 5, protective cover 8 and rope coiling bracket 12 are specifically fixed to the base b3, and the base a2 is fixed to the platform 1.

[0046] Brake arm 15 is connected to hydraulic thruster 16. Motor 5 is fixed to base via motor base 4. An encoder is also provided on the output shaft of motor 5. Motor 5 uses switched reluctance motor or other motors that realize commutation function and control system to perform speed control of oil pumping device of the present invention. The encoder on the output shaft of motor 5 can calculate the current layer number based on the count change.

[0047] The outer edge of the rope coiler 13 is equipped with a track. A flexible sucker rod 11 is wound on the drum 10. The other end of the flexible sucker rod 11 passes through the rope coiler 13 and the overhead crane pulley 24 in sequence, and is connected to the blowout preventer 29. The other end of the blowout preventer 29 is connected to the wellhead sealing device 30 and the wellhead device 32 in sequence. A rope-blocking device 23 is bolted to the upper part of the overhead crane pulley 24 on the bearing seat b. The rope-blocking device 23 can prevent the flexible sucker rod 11 on the pulley from jumping out of the groove or slipping off.

[0048] Example 4

[0049] The present invention relates to a long-stroke oil well pumping device, such as... Figure 1 , Figure 2 As shown, it includes a platform 1, on which a transmission device, a rope winding device, and a reversing device are fixed.

[0050] The transmission device includes a motor 5 and a protective cover 8. The output shaft of the motor 5 is connected to the input shaft of the gearbox 35. The output shaft of the gearbox 35 is connected to the small sprocket 6 through a coupling 34. Two bearing seats a are fixed to the upper surface of the protective cover 8 by bolts. A roller 10 is set between the two bearing seats a through a roller shaft. A large sprocket 9 and a brake arm 15 are respectively set at both ends of the roller 10. The small sprocket 6 and the large sprocket 9 are connected by a chain 7.

[0051] The rope coiling device includes a rope coiling bracket 12, which fixes a pulley shaft 14 through a pulley shaft support, and a rope coiler 13 is mounted on the pulley shaft 14.

[0052] The reversing device includes a bracket 31, to which a lower crane plate 19 is bolted. A through hole is formed on the lower crane plate 19 near the end face of the bracket 31, along the direction of the bracket 31. A spindle 25 is mounted within the through hole via a tapered roller ball bearing 20. One end of the spindle 25 abuts against the end face of the bracket 31, and the other end passes through an upper crane plate 26. An upper crane plate 26 is fixed to a crane pulley support 22 via screws. A crane pulley 24 is mounted on the crane pulley support 22 via a bearing seat b. The crane pulley 24, spindle 25, upper crane plate 26, and crane pulley support 22 are integrated and can swing left and right on a one-way thrust ball bearing b27. There is a certain gap between the upper crane plate 26 and the lower crane plate 19. A bearing assembly is installed eccentrically to the left of the centerline of the lower crane plate 19.

[0053] As the pulley shaft 14 rotates with the drum 10 and the flexible sucker rod 11, it slides left and right along the pulley guide shaft, causing the flexible sucker rod 11 to swing left and right, which in turn drives the overhead crane plate 26 and the pulley assembly to rotate left and right, thus realizing the orderly multi-layer coiling of the flexible sucker rod 11 on the drum 10.

[0054] The motor 5, protective cover 8 and rope coiling bracket 12 are fixed to the platform 1 by the base. The reversing device is located at one end of the platform 1 near the rope coiling device. The base consists of two stacked bases a2 and b3, which are fixed together by bolts. The motor 5, protective cover 8 and rope coiling bracket 12 are specifically fixed to the base b3, and the base a2 is fixed to the platform 1.

[0055] Brake arm 15 is connected to hydraulic thruster 16. Motor 5 is fixed to base via motor base 4. An encoder is also provided on the output shaft of motor 5. Motor 5 uses switched reluctance motor or other motors that realize commutation function and control system to perform speed control of oil pumping device of the present invention. The encoder on the output shaft of motor 5 can calculate the current layer number based on the count change.

[0056] The outer edge of the rope coiler 13 is equipped with a track. A flexible sucker rod 11 is wound on the drum 10. The other end of the flexible sucker rod 11 passes through the rope coiler 13 and the overhead crane pulley 24 in sequence, and is connected to the blowout preventer 29. The other end of the blowout preventer 29 is connected to the wellhead sealing device 30 and the wellhead device 32 in sequence. A rope-blocking device 23 is bolted to the upper part of the overhead crane pulley 24 on the bearing seat b. The rope-blocking device 23 can prevent the flexible sucker rod 11 on the pulley from jumping out of the groove or slipping off.

[0057] A one-way thrust ball bearing a21 is fitted between the upper plate 26 and the lower plate 19 of the gantry crane. The upper plate 26 and the lower plate 19 of the gantry crane have a groove a along their long side at the end away from the support 31. The groove a can prevent the flexible sucker rod 11 on the gantry crane pulley 24 from swinging and colliding with the upper plate 26 and the lower plate 19 of the gantry crane. A one-way thrust ball bearing b27 with a groove b is fitted between the upper plate 26 and the lower plate 19 of the gantry crane. Baffles are provided on both ends of the groove b. At the groove a, a certain length of the one-way thrust ball bearing b27 is also cut off. To prevent the balls of the cut one-way thrust ball bearing b27 from slipping out from the notch, baffles are welded to both ends of the notch. The spindle 25 passes through the upper plate 26 and the lower plate 19 of the overhead crane and is hung on the upper plate 26. It connects the upper plate 26, the overhead crane pulley 24, the inner ring of the tapered roller ball bearing 20, and the upper rails of the one-way thrust ball bearings a21 and b27 into a single unit, allowing for eccentric rotation around the spindle 25. The lower plate 19 has two pairs of lower rails for the one-way thrust ball bearings, which are connected to the outer ring of the tapered roller ball bearing 20. The overhead crane assembly is welded to the top of the bracket 31 via the bottom surface of the lower plate 19. A bearing cover plate is installed on the bottom surface of the lower plate 19, pressing against the end face of the outer ring of the tapered roller ball bearing 20 to prevent axial movement. Nuts press against the end face of the inner ring of the one-way thrust ball bearing b27.

[0058] A diagonal brace 17 is provided between the support 31 and the platform 1. One end of the diagonal brace 17 is fixed to the support 31 by bolts and fixing plate a18, and the other end of the diagonal brace 17 is fixed to the platform 1 by bolts and fixing plate b33.

[0059] A support device 28 is provided between the bracket 31 and the lower plate 19 of the overhead crane, and the two ends of the support device 28 are fixed to the bracket 31 and the lower plate 19 of the overhead crane, respectively.

[0060] The working process of the long-stroke oil well pumping device of the present invention is as follows:

[0061] One end of the flexible sucker rod 11 is wound around the drum 10. A large sprocket 9 is installed at one end of the drum shaft of the drum 10. At the same time, the motor 5 is connected to the gearbox 35. The output shaft of the gearbox 35 is connected to the small sprocket 6 through the coupling 34. The large sprocket 9 and the small sprocket 6 are connected by a chain 7. The motor 5 rotates at high speed to output torque. After the gearbox 35 reduces speed by one stage and the large sprocket 9 and the small sprocket 6 reduce speed by two stages, the large sprocket 9 drives the drum 10 to coil the rope in an orderly multi-layer manner. The other end of the flexible sucker rod 11 is guided by the automatic rope coiler 13 and reversed by the overhead crane pulley 24, and then connected to the downhole device to realize the oil recovery operation of the oil well.

[0062] The other end of the drum shaft of the drum 10 is equipped with a brake support arm 15 and a hydraulic thruster 16. The hydraulic thruster 16 automatically controls the release and tightening of the brake, thereby achieving automatic braking of the drum 10. The overhead crane pulley mechanism ensures that the flexible sucker rod 11 remains concentric with the wellhead at all times during the back-and-forth winding of the drum 10.

Claims

1. A long-stroke oil well pumping device, characterized in that, Includes a platform (1), on which a transmission device, a rope coiling device and a reversing device are fixed; The transmission device includes a motor (5) and a protective cover (8). The output shaft of the motor (5) is connected to the input shaft of the gearbox (35). The output shaft of the gearbox (35) is connected to a small sprocket (6) through a coupling (34). Two bearing seats a are fixed to the upper surface of the protective cover (8) by bolts. A roller (10) is provided between the two bearing seats a through a roller shaft. A large sprocket (9) and a brake arm (15) are respectively provided at both ends of the roller (10). The small sprocket (6) and the large sprocket (9) are connected by a chain (7). The rope coiling device includes a rope coiling bracket (12), which fixes a pulley shaft (14) through a pulley shaft support, and the pulley shaft (14) is fitted with a rope coiler (13). The reversing device includes a bracket (31), and the bracket (31) is fixed with a crane lower plate (19) by bolts. The crane lower plate (19) has a through hole along the direction of the bracket (31) near the end face of the bracket (31). A spindle (25) is provided in the through hole through a tapered roller ball bearing (20). One end of the spindle (25) abuts against the end face of the bracket (31), and the other end passes through the crane upper plate (26). The crane upper plate (26) is fixed with a crane pulley support (22) by screws. A crane pulley (24) is provided on the crane pulley support (22) through a bearing seat b. The motor (5), protective cover (8) and rope support (12) are fixed on the platform (1) by the base, and the reversing device is located on the platform (1) near the rope device.

2. The oil well pumping device according to claim 1, characterized in that, The brake arm (15) is connected to the hydraulic thruster (16).

3. The oil well pumping device according to claim 1, characterized in that, The motor (5) is fixed on the base by the motor base (4), and an encoder is also provided on the output shaft of the motor (5).

4. The oil extraction device according to claim 1, characterized in that, The outer edge of the rope coiler (13) is provided with a track.

5. The oil well pumping device according to claim 4, characterized in that, A flexible sucker rod (11) is wound around the roller (10). The other end of the flexible sucker rod (11) passes through a rope coiler (13) and a crane pulley (24) in sequence, and is connected to a blowout preventer (29). The other end of the blowout preventer (29) is connected to a wellhead sealing device (30) and a wellhead device (32) in sequence.

6. The oil well pumping device according to claim 5, characterized in that, The bearing seat b is bolted to the upper part of the overhead crane pulley (24) with a rope-blocking device (23).

7. The oil well pumping device according to claim 1, characterized in that, The spindle (25) is fitted with a one-way thrust ball bearing a (21) between the upper plate (26) and the lower plate (19) of the gantry crane. The upper plate (26) and the lower plate (19) of the gantry crane have a groove a along the long side at the end away from the support (31). A one-way thrust ball bearing b (27) with a groove b is fitted between the upper plate (26) and the lower plate (19) of the gantry crane. Baffles are provided on both ends of the groove b.

8. The oil well pumping device according to claim 1, characterized in that, A tie rod (17) is provided between the support (31) and the platform (1). One end of the tie rod (17) is fixed to the support (31) by bolts and fixing plate a (18), and the other end of the tie rod (17) is fixed to the platform (1) by bolts and fixing plate b (33).

9. The oil well pumping device according to claim 1, characterized in that, A support device (28) is provided between the bracket (31) and the lower plate of the gantry crane (19), and the two ends of the support device (28) are fixed on the bracket (31) and the lower plate of the gantry crane (19) respectively.

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