Automatic balancing weight adjusting device of oil pumping unit

Abstract

The invention belongs to the technical field of beam-pumping units, and particularly relates to an automatic balancing weight adjusting device of a pumping unit, which comprises a walking beam, and an adjusting mechanism is arranged at the top position of the walking beam; a threaded rod can be driven to rotate by starting a driving motor, and when the threaded rod rotates, a threaded ring is driven to move in the direction of the threaded rod, so that the threaded ring drives an inner pipe to move in an outer pipe, the inner pipe drives a moving frame to move, and the position of the moving frame is adjusted; the balance weight bodies on the two sides can be driven to move together when the movable frame moves, balance adjustment can be carried out when the balance weight bodies move, the balance adjustment effect is achieved under the action of the balance weight bodies, the balance of the oil pumping unit can be automatically adjusted without manual operation of workers, and the working efficiency is improved. Automatic balance adjustment and intelligent parameter adjustment can be achieved under the working condition that the pumping unit does not need to be shut down.

Description

Technical Field

[0001] The invention belongs to the technical field of beam pumping units, and in particular relates to an automatic counterweight adjustment device for pumping units. Background Art

[0002] The walking beam pumping unit is the most common and classic type of mechanical oil extraction equipment in the petroleum industry. It is mainly used in the late stage of oil field production. When the energy of the local formation is insufficient to make the crude oil spray to the ground, it converts electrical energy into mechanical energy, drives the downhole oil pump to move back and forth, and thus pumps the crude oil to the ground. The walking beam pumping unit has always been the most widely used lifting equipment in oil fields at home and abroad. Usually, the balance of the walking beam unit is a combination of crank balance and walking beam balance, which is called compound balance. The walking beam balance has built-in and external structures. The built-in type is suitable for fixing the small counterweight body in the walking beam body unchanged, and the parameters are not adjustable. The external type adds a tail counterweight at the tail of the walking beam body. The tail counterweight body is a cantilever structure, with extended channel steels on both sides of the counterweight body, and the movable counterweight is fixed to the channel steel by pins or screws.

[0003] Although the counterweight of this structure can realize the adjustment of the walking beam counterweight and expand the range of parameter adjustment, the load corresponding to each well changes with the depth and time of mining, and the adjustment range of the movable counterweight of the oil pumping unit with this structure is small. Each adjustment requires the oil pumping unit to be shut down and the staff to manually adjust the position of the movable counterweight according to the mining situation, resulting in a long adjustment time and high labor intensity for the staff, affecting the use of the oil pumping unit. Moreover, when applied to oil pumping units with different loads, the adjustment parameters also require the adjustment of the fixed counterweight, which is inconvenient to adjust and use.

[0004] In order to solve the above problems, the present application proposes an automatic counterweight adjustment device for an oil pumping unit. Summary of the Invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides an automatic counterweight adjustment device for an oil pumping unit, which has the characteristics of being able to achieve automatic adjustment and intelligent parameter adjustment without stopping the unit.

[0006] To achieve the above object, the present invention provides the following technical solution: an automatic counterweight adjustment device for an oil pumping unit, comprising a walking beam, wherein an adjustment mechanism is provided at the top position of the walking beam;

[0007] The adjusting mechanism includes an outer tube, a bearing seat is provided at either end of the outer tube, the bearing seat is fixedly connected to the outer tube by using bolts, a threaded rod is rotatably connected in the bearing seat, the threaded rod is provided in the outer tube, a threaded ring is threadedly connected on the threaded rod, an inner tube is fixedly connected to the side of the threaded ring away from the bearing seat, the inner tube is slidably connected to the outer tube, and a movable frame is provided at the end of the inner tube away from the bearing seat.

[0008] As a preferred embodiment of the automatic counterweight adjustment device for an oil pumping unit of the present invention, one end of the walking beam close to the movable frame is fixedly connected to a rear beam, and the movable frame is slidably connected to the rear beam.

[0009] As a preferred embodiment of the automatic counterweight adjustment device for an oil pumping unit of the present invention, counterweight bodies are symmetrically installed on both sides of the movable frame.

[0010] As a preferred automatic adjustment counterweight device for an oil pumping unit of the present invention, the inner tube is fixedly connected to a first connecting ring at one end close to the movable frame, and a second connecting ring is provided on a side of the first connecting ring close to the movable frame, and the second connecting ring is fixedly connected to the first connecting ring by using bolts.

[0011] As a preferred automatic adjustment counterweight device for an oil pumping unit of the present invention, the second connecting ring is fixedly connected to a first joint on a side away from the first connecting ring, and the first joint is fixedly connected to a second joint on an end away from the second connecting ring.

[0012] As a preferred embodiment of the automatic counterweight adjustment device for an oil pumping unit of the present invention, the second joint is movably connected to the movable frame.

[0013] As a preferred embodiment of the automatic balancing weight adjustment device for an oil pumping unit of the present invention, a connecting shell is fixedly connected to a side of the bearing seat away from the outer tube, and a driving motor is installed at an end of the connecting shell away from the bearing seat.

[0014] As a preferred embodiment of the automatic counterweight adjustment device for an oil pumping unit of the present invention, a coupling is fixedly connected to the output shaft of the driving motor, and one end of the threaded rod away from the movable frame is fixedly connected to the coupling.

[0015] As a preferred automatic balance weight adjustment device for an oil pumping unit of the present invention, one end of the threaded rod away from the coupling is fixedly connected to a limit ring.

[0016] As a preferred embodiment of the automatic counterweight adjustment device for an oil pumping unit of the present invention, a support ring is fixedly connected to the outer wall of the outer tube, and the support ring is fixedly connected to the walking beam.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: an adjustment mechanism is added to the present application, and the threaded rod can be driven to rotate by starting the drive motor. When the threaded rod rotates, the threaded ring will be driven to move along the direction of the threaded rod, so that the threaded ring drives the inner tube to move inside the outer tube, and the inner tube drives the movable frame to move, thereby adjusting the position of the movable frame. By installing counterweights on both sides of the movable frame, the movable frame can drive the counterweights on both sides to move together when moving. When the counterweights move, balance adjustment is performed, thereby achieving the function of adjusting the balance under the action of the counterweights. The balance of the oil pumping unit can be automatically adjusted without manual operation by the staff, and automatic adjustment of the balance is achieved under the working condition that the oil pumping unit does not need to be shut down. Intelligent parameter adjustment is achieved, and in order to obtain a sufficiently large reduction ratio, the drive motor adopts a reduction motor, the drive motor adopts a cycloid pin reducer, a four-pole motor with a power of 0.55kW, which has the advantages of high efficiency, low noise and compact structure. The threaded rod and the threaded ring use Tr60*8 ball screws, which have the characteristics of high transmission precision and low noise, and also have a self-locking function to ensure the stability of the adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a structural diagram of the position of the adjustment mechanism in the present invention;

[0021] Figure 3 For the present invention Figure 2 Enlarged view of part A;

[0022] Figure 4 For the present invention Figure 2 Enlarged view of part B;

[0023] Figure 5 It is a structural schematic diagram of the position of the counterweight body in the present invention;

[0024] In the picture:

[0025] 1. Traveling beams;

[0026] 2. Rear beam;

[0027] 3. Adjustment mechanism; 31. Outer tube; 32. Bearing seat; 33. Connecting housing; 34. Drive motor; 35. Coupling; 36. Threaded rod; 37. Threaded ring; 38. Inner tube; 39. Limiting ring; 310. First connecting ring; 311. Second connecting ring; 312. First joint; 313. Second joint;

[0028] 4. Support ring;

[0029] 5. Mobile rack;

[0030] 6. Counterweight. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figures 1 to 5 As shown;

[0034] Combining the above:

[0035] In order to achieve automatic adjustment and balance, the oil pumping unit automatically adjusts the counterweight device, including a walking beam 1, and an adjustment mechanism 3 is provided at the top position of the walking beam 1;

[0036] The adjusting mechanism 3 includes an outer tube 31, and a bearing seat 32 is provided at either end of the outer tube 31. The bearing seat 32 is fixedly connected to the outer tube 31 by using bolts. A threaded rod 36 is rotatably connected inside the bearing seat 32. The threaded rod 36 is provided in the outer tube 31. A threaded ring 37 is threadedly connected to the threaded rod 36. An inner tube 38 is fixedly connected to the side of the threaded ring 37 away from the bearing seat 32. The inner tube 38 is slidably connected to the outer tube 31, and a movable frame 5 is provided at the end of the inner tube 38 away from the bearing seat 32.

[0037] When the rod 36 is rotated, the threaded ring 37 is driven to move along the direction of the threaded rod 36, thereby causing the threaded ring 37 to drive the inner tube 38 to move in the outer tube 31, and causing the inner tube 38 to drive the movable frame 5 to move, thereby adjusting the position of the movable frame 5. The traditional operation mode of stopping the machine and manually climbing to the top of the rod 1 to manually move the bulky balancing block is abandoned, which greatly improves the adjustment efficiency and convenience. In addition, the precise threaded transmission of the threaded rod 36 and the threaded ring 37, combined with the sliding guide of the inner and outer tubes 31, can achieve high-precision adjustment of the position of the movable frame 5. , progressive adjustment to ensure that the balance state reaches the optimal state, and can dynamically and real-time adjust the balance weight position according to the changes in the actual operating load of the pumping unit, such as changes in oil viscosity, liquid volume fluctuations, wax deposition and other factors, so as to always keep the system close to the optimal balance state, so that the precise balance reduces the abnormal vibration, impact load and stress concentration of key components such as the walking beam 1, bracket, and reducer caused by imbalance, and effectively protects the equipment foundation. The outer tube 31 not only provides precise axial linear motion guidance for the inner tube 38 to prevent lateral deviation or jamming, but also constitutes a solid protective shell to effectively shield the erosion and pollution of the internal precision threaded transmission components by harsh environments such as wind, sand, rain, and salt spray, thereby extending their service life. The bearing seat 32 is firmly fixed to the outer tube 31 by bolts, providing a stable, low-friction rotation support point for the threaded rod 36, ensuring that the threaded rod 36 rotates smoothly and without axial movement, while preventing it from falling off due to gravity or vibration, thereby ensuring the long-term operation reliability of the transmission system.

[0038] Going further:

[0039] like Figures 3 to 5 As shown;

[0040] Combining the above:

[0041] In order to achieve balance adjustment, in an optional embodiment, the end of the walking beam 1 close to the moving frame 5 is fixedly connected to the rear beam 2, the moving frame 5 is slidingly connected to the rear beam 2, and counterweights 6 are symmetrically installed on both sides of the moving frame 5.

[0042] In this embodiment, by connecting the rear beam 2 to the walking beam 1, the mobile frame 5 obtains space and support for movement, which makes it easy to adjust the position of the mobile frame 5. The rear beam 2 serves as a rigid extension structure of the walking beam 1, providing the mobile frame 5 with a sufficient, stable and low-friction moving track. This not only greatly expands the adjustment range of the counterweight and adapts to a wider range of working conditions, but also ensures that the mobile frame 5 can slide smoothly and steadily even if it carries heavy counterweights 6 on both sides without deformation or jamming risks. Combined with the precision drive of the adjustment mechanism 3 and the high-precision sliding track of the rear beam 2, the balance weight can be adjusted smoothly. The dual precise control of the position of the weight body 6 and the sliding connection between the mobile frame 5 and the rear beam 2 ensure that the adjustment force is directly and effectively converted into the linear displacement of the counterweight body 6, avoiding energy loss or position deviation, so that the mobile frame 5 can drive the counterweight bodies 6 on both sides to move together when moving. When the counterweight body 6 moves, it will perform balance adjustment, thereby achieving the adjustment balance under the action of the counterweight body 6, and the counterweight body 6 is fixedly installed on both sides of the mobile frame 5, avoiding the risk of loosening and falling of traditional bulk balance blocks at high places. The reliable connection between the mobile frame 5 and the rear beam 2 further ensures the safety of the counterweight system in motion and static states.

[0043] Going further:

[0044] like Figures 2 to 5 As shown;

[0045] Combining the above:

[0046] To facilitate disassembly and assembly, in an optional embodiment, the inner tube 38 is fixedly connected to the first connecting ring 310 at one end close to the movable frame 5, and a second connecting ring 311 is provided on the side of the first connecting ring 310 close to the movable frame 5. The second connecting ring 311 is fixedly connected to the first connecting ring 310 by using bolts, and the side of the second connecting ring 311 away from the first connecting ring 310 is fixedly connected to the first joint 312, and the end of the first joint 312 away from the second connecting ring 311 is fixedly connected to the second joint 313, and the second joint 313 is movably connected to the movable frame 5.

[0047] In this embodiment, a first connecting ring 310 is provided at one end of the inner tube 38 close to the movable frame 5, and the second connecting ring 311 is fixedly connected to the first connecting ring 310 with bolts, so as to facilitate the installation and removal of the first joint 312. By connecting the second joint 313 to the movable frame 5 and connecting the second joint 313 to the first joint 312, the movable frame 5 is conveniently installed and removed, thereby realizing that the inner tube 38 drives the movable frame 5 to reciprocate on the rear beam 2, and the adjustment is convenient. The first connecting ring 310 and the second connecting ring 311 are fastened by bolts. A first layer of detachable interface is formed. This design clearly separates the driving end of the inner tube 38 from the subsequent connecting components, the first joint 312 and the second joint 313, in a modular manner. When the inner tube 38 and the core components of the adjustment mechanism 3, such as the threaded rod 36 and the threaded ring 37, need to be inspected or replaced, or when the first joint 312, the second joint 313 or the movable frame 5 itself needs to be maintained or replaced, it is only necessary to remove the bolts between the first connecting ring 310 and the second connecting ring 311 to quickly separate the relevant modules, which greatly simplifies the disassembly process and significantly shortens the repair downtime and maintenance time.

[0048] Going further:

[0049] like Figure 3 As shown;

[0050] Combining the above:

[0051] In order to improve the stability of operation, in an optional embodiment, the side of the bearing seat 32 away from the outer tube 31 is fixedly connected to a connecting shell 33, and the end of the connecting shell 33 away from the bearing seat 32 is installed with a drive motor 34. The output shaft of the drive motor 34 is fixedly connected to a coupling 35, and the end of the threaded rod 36 away from the movable frame 5 is fixedly connected to the coupling 35.

[0052] In this embodiment: by fixing a connecting shell 33 on the side of the bearing seat 32 away from the outer tube 31, the connecting shell 33 can protect the coupling 35 inside the connecting shell 33, thereby extending the service life of the coupling 35. The coupling 35 is an elastic coupling 35. By using the elastic coupling 35 to connect the output shaft of the drive motor 34 with the threaded rod 36, the drive motor 34 can drive the threaded rod 36 to rotate, and the balance of the oil pumping unit can be automatically adjusted without manual operation by the staff, thereby realizing automatic adjustment of the balance without stopping the oil pumping unit, intelligent parameter adjustment, and in order to obtain a sufficiently large reduction ratio, the drive motor 34 adopts a reduction motor, the drive motor 34 adopts a cycloid pin reducer, a four-pole motor with a power of 0.55kW, which has the advantages of high efficiency, low noise and compact structure, the threaded rod 36 and the threaded ring 37 use Tr60*8 ball screws, which have the characteristics of high transmission accuracy and low noise, and also have a self-locking function to ensure the stability of the adjustment.

[0053] Going further:

[0054] like Figure 3 and Figure 4 As shown;

[0055] Combining the above:

[0056] In an optional embodiment, one end of the threaded rod 36 away from the coupling 35 is fixedly connected to a limit ring 39 .

[0057] In this embodiment: by fixing a limit ring 39 at the end of the threaded rod 36 away from the coupling 35, the movement of the threaded ring 37 can be limited. The limit ring 39 is directly fixed to the end of the threaded rod 36 as a rigid physical blocking structure, constituting the ultimate hard limit on the movement range of the threaded ring 37, eliminating the possibility of the threaded ring 37 being completely unscrewed and falling off from the threaded rod 36 at the extreme end of the stroke, avoiding the major safety accidents and structural damage risks of the inner tube 38, movable frame 5 and heavy counterweight 6 slipping out of control as a whole, and ensuring that the movement range of the threaded ring 37 is strictly limited to the range of effective sliding fit between the inner tube 38 and the outer tube 31, which prevents the inner tube 38 from being separated from the outer tube 31 guide due to excessive extension, or causing internal structure collision due to excessive retraction.

[0058] Going further:

[0059] like Figure 1 As shown;

[0060] Combining the above:

[0061] In an optional embodiment, a support ring 4 is fixedly connected to the outer wall of the outer tube 31 , and the support ring 4 is fixedly connected to the walking beam 1 .

[0062] In this embodiment, the support ring 4 is used to support and fix the outer tube 31 .

[0063] The working principle and use process of the present invention are as follows: the walking beam 1 is the most core load-bearing and motion conversion component in the oil pumping unit. The walking beam 1 is a device for placing the balance block of the walking beam 1. The adjustment mechanism 3 is set on the walking beam 1 to achieve the function of adjusting the balance. The outer tube 31 is used to guide and protect the inner tube 38. The bearing seat 32 can support the threaded rod 36 to prevent the threaded rod 36 from falling, so that the threaded rod 36 can rotate in the bearing seat 32. When the threaded rod 36 rotates, it will drive the threaded ring 37 to move along the direction of the threaded rod 36, so that the threaded ring 37 drives the inner tube 38 to move in the outer tube 31, so that the inner tube 38 drives the movable frame 5 to move, and the position of the movable frame 5 is adjusted, abandoning the traditional method of stopping the machine and climbing manually. The operation mode of manually moving the bulky balancing block to the top of the walking beam 1 greatly improves the adjustment efficiency and convenience, and utilizes the precise threaded transmission of the threaded rod 36 and the threaded ring 37, combined with the sliding guide of the inner and outer tubes 31, to achieve high-precision and progressive adjustment of the position of the movable frame 5, ensuring that the balance state is optimal, and can dynamically and in real time adjust the position of the balancing weight according to the changes in the actual operating load of the pumping unit, such as changes in oil viscosity, liquid volume fluctuations, wax deposition and other factors, so as to always keep the system close to the optimal balance state, thereby making precise balance reduce abnormal vibration, impact load and stress concentration of key components such as the walking beam 1, bracket, and reducer caused by imbalance, effectively protecting the equipment foundation, and the outer tube 31 not only provides precise axial The linear motion guide prevents lateral deviation or jamming, and at the same time forms a solid protective shell, effectively shielding the erosion and pollution of the internal precision threaded transmission components by harsh environments such as wind, sand, rain, and salt spray, thereby extending their service life. The bearing seat 32 is firmly fixed to the outer tube 31 by bolts, providing a stable, low-friction rotation support point for the threaded rod 36, ensuring that the threaded rod 36 rotates smoothly and without axial movement, while preventing it from falling off due to gravity or vibration, thereby ensuring the long-term operation reliability of the transmission system. By connecting the rear beam 2 to the walking beam 1, the movable frame 5 obtains the space and support for movement, which facilitates the adjustment of the position of the movable frame 5. The rear beam 2 serves as a rigid extension structure of the walking beam 1, providing the movable frame 5 with sufficient, stable and low-friction support. The movable track of friction not only greatly expands the adjustment stroke range of the counterweight and adapts to a wider range of working conditions, but its solid structural design also ensures that the movable frame 5 can slide steadily and smoothly even if it carries heavy counterweights 6 on both sides, without the risk of deformation or jamming. Combined with the precision drive of the adjustment mechanism 3 and the high-precision sliding track of the rear beam 2, dual precise control of the position of the counterweight 6 is achieved. The sliding connection between the movable frame 5 and the rear beam 2 ensures that the adjustment force is directly and effectively converted into the linear displacement of the counterweight 6, avoiding energy loss or position deviation, so that the movable frame 5 can drive the counterweights 6 on both sides to move together when moving. When the counterweight 6 moves, it will perform balance adjustment, thereby achieving the function of adjusting the balance under the action of the counterweight 6.The counterweight body 6 is fixedly mounted on both sides of the mobile frame 5, avoiding the risk of loosening and falling of traditional bulk balancing blocks at high places. The reliable connection between the mobile frame 5 and the rear beam 2 further ensures the safety of the counterweight system in motion and static states. A first connecting ring 310 is provided at one end of the inner tube 38 close to the mobile frame 5, and the second connecting ring 311 is fixedly connected to the first connecting ring 310 with a bolt, so as to facilitate the installation and disassembly of the first joint 312. By connecting the second joint 313 to the mobile frame 5 and connecting the second joint 313 to the first joint 312, it is convenient to install and disassemble the mobile frame 5, so that the inner tube 38 drives the mobile frame 5 to reciprocate on the rear beam 2, which is convenient for adjustment. The second connecting ring 311 is fastened by bolts to form a first layer of detachable interface. This design clearly separates the driving end of the inner tube 38 from the subsequent connecting components, the first joint 312 and the second joint 313, in a modular manner. When the inner tube 38 and the core components of the adjustment mechanism 3, such as the threaded rod 36 and the threaded ring 37, need to be repaired or replaced, or when the first joint 312, the second joint 313 or the movable frame 5 itself needs to be maintained or replaced, it is only necessary to remove the bolts between the first connecting ring 310 and the second connecting ring 311 to quickly separate the relevant modules, which greatly simplifies the disassembly process and significantly shortens the maintenance downtime and maintenance time. By fixing the connecting shell 33 on the side of the bearing seat 32 away from the outer tube 31, the connecting shell 33 can be aligned with the connecting shell 33 inner coupling 35 is protected to extend the service life of coupling 35. Coupling 35 is an elastic coupling 35. By using elastic coupling 35, the output shaft of driving motor 34 is connected with threaded rod 36, so that driving motor 34 can drive threaded rod 36 to rotate, and the balance of oil pumping unit can be automatically adjusted without manual operation of staff, so that the balance can be automatically adjusted without stopping the oil pumping unit. Intelligent parameter adjustment is realized, and in order to obtain a sufficiently large reduction ratio, driving motor 34 adopts reduction motor, driving motor 34 adopts cycloid reducer, four-pole motor with power of 0.55kW, which has the advantages of high efficiency, low noise and compact structure. Threaded rod 36 and threaded ring 37 are made of Tr60*8 ball screw. The lever has the characteristics of high transmission precision and low noise, and also has a self-locking function to ensure the stability of adjustment. By fixing the limit ring 39 at the end of the threaded rod 36 away from the coupling 35, the movement of the threaded ring 37 can be limited. The limit ring 39 is directly fixed to the end of the threaded rod 36 as a rigid physical blocking structure, forming the ultimate hard limit on the movement range of the threaded ring 37, eliminating the possibility of the threaded ring 37 being completely unscrewed and falling off from the threaded rod 36 at the end of the extreme stroke, avoiding the major safety accidents and structural damage risks of the inner tube 38, the moving frame 5 and the heavy counterweight 6 being out of control and slipping off, and ensuring that the movement range of the threaded ring 37 is strictly limited to the range of effective sliding fit between the inner tube 38 and the outer tube 31.This prevents the inner tube 38 from being out of the guide of the outer tube 31 due to excessive extension, or from colliding with the internal structure due to excessive retraction.

[0064] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An automatic counterweight adjustment device for an oil pumping unit, comprising a walking beam (1), characterized in that: An adjustment mechanism (3) is provided at the top position of the walking beam (1); The adjusting mechanism (3) comprises an outer tube (31), wherein a bearing seat (32) is provided at any one end of the outer tube (31), wherein the bearing seat (32) is fixedly connected to the outer tube (31) by using bolts, wherein a threaded rod (36) is rotatably connected inside the bearing seat (32), wherein the threaded rod (36) is provided inside the outer tube (31), wherein a threaded ring (37) is threadedly connected to the threaded rod (36), wherein an inner tube (38) is fixedly connected to a side of the threaded ring (37) away from the bearing seat (32), wherein the inner tube (38) is slidably connected to the outer tube (31), and a movable frame (5) is provided at one end of the inner tube (38) away from the bearing seat (32).

2. The automatic counterweight adjustment device for an oil pumping unit according to claim 1, characterized in that: One end of the walking beam (1) close to the moving frame (5) is fixedly connected to a rear beam (2), and the moving frame (5) is slidably connected to the rear beam (2).

3. The automatic counterweight adjustment device for an oil pumping unit according to claim 2, characterized in that: Counterweights (6) are symmetrically mounted on both sides of the movable frame (5).

4. The automatic counterweight adjustment device for an oil pumping unit according to claim 3, characterized in that: A first connecting ring (310) is fixedly connected to one end of the inner tube (38) close to the mobile frame (5), a second connecting ring (311) is provided on one side of the first connecting ring (310) close to the mobile frame (5), and the second connecting ring (311) is fixedly connected to the first connecting ring (310) by using bolts.

5. The automatic counterweight adjustment device for an oil pumping unit according to claim 4, characterized in that: A first joint (312) is fixedly connected to a side of the second connecting ring (311) away from the first connecting ring (310), and a second joint (313) is fixedly connected to an end of the first joint (312) away from the second connecting ring (311).

6. The automatic counterweight adjustment device for an oil pumping unit according to claim 5, characterized in that: The second joint (313) is movably connected to the movable frame (5).

7. The automatic counterweight adjustment device for an oil pumping unit according to claim 1, characterized in that: A connecting shell (33) is fixedly connected to a side of the bearing seat (32) away from the outer tube (31), and a driving motor (34) is installed on an end of the connecting shell (33) away from the bearing seat (32).

8. The automatic counterweight adjustment device for an oil pumping unit according to claim 7, characterized in that: A coupling (35) is fixedly connected to the output shaft of the driving motor (34), and one end of the threaded rod (36) away from the movable frame (5) is fixedly connected to the coupling (35).

9. The automatic counterweight adjustment device for an oil pumping unit according to claim 8, characterized in that: One end of the threaded rod (36) away from the coupling (35) is fixedly connected to a limit ring (39).

10. The automatic counterweight adjustment device for an oil pumping unit according to claim 1, characterized in that: A support ring (4) is fixedly connected to the outer wall of the outer tube (31), and the support ring (4) is fixedly connected to the walking beam (1).

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