Counterweight adjustable pumping unit

Abstract

The utility model relates to pumping unit technical field, is a counterweight adjustable pumping unit, including beam pumping unit and the counterweight assembly that the balance horse head of beam pumping unit is connected together, and the counterweight assembly includes height adjusting assembly and counterweight assembly. The utility model is reasonable and compact in structure, sets up multiple adjusting holes, can adjust according to the stroke of beam pumping unit, when the stroke of beam pumping unit is 3 meters, the connecting hole of guide pipe and the adjusting hole of the lowermost connecting rod are installed together through connecting pin, so that the distance between counterweight assembly and ground when reaching the lowest point can be reduced, so that the stroke adjustment of counterweight assembly and pumping unit does not interfere with each other, the setting of adjusting hole can also fall counterweight assembly on the ground when maintaining, then disconnecting pin can separate the balance horse head and counterweight assembly, reduce the dismounting difficulty of counterweight assembly.

Description

Technical Field

[0001] This utility model relates to the field of oil pumping machine technology, and is an oil pumping machine with adjustable counterweight. Background Technology

[0002] Beam pumping units have become the mainstream equipment widely used in mechanical oil extraction due to their strong adaptability and convenient maintenance. Currently, the commonly used beam pumping unit structure includes: a walking beam, a support frame, a walking head, a suspension rope device, a connecting rod, a reducer, a crank, a base, and a motor. The support frame is bolted to the base, the walking beam is mounted on the top of the support frame with bearings, the working walking head is installed at the front end of the walking beam, the suspension rope device is fixedly connected to the working walking head, and the balance walking head is installed at the rear end of the walking beam.

[0003] Regarding balance adjustment methods, existing technologies mainly employ two approaches: one is to increase or decrease the mass of the counterweight, and the other is to change the balancing arm of the counterweight. Adjustment methods are categorized into manual adjustment and automatic adjustment. Manual adjustment relies on manually increasing or decreasing the amount of counterweight on the walking beam or changing the position of the crank balance weights, which has significant drawbacks such as high labor intensity, high safety risks, and high adjustment costs.

[0004] In the current common application of double-head pumping units, a counterweight box (empty) is connected to the balance head of the walking beam via a steel wire rope. The counterweight box is connected to the steel wire rope, and movable counterweight blocks are placed inside the counterweight box. Since the counterweight is a single unit, the number of counterweight blocks that need to be added or removed is very large (for example, if the weight difference is 1 ton, and each movable counterweight block weighs 20 kilograms, then 50 blocks need to be moved), which is time-consuming and labor-intensive. Summary of the Invention

[0005] This utility model provides a counterweight adjustable pumping unit, which overcomes the shortcomings of the prior art and can effectively solve the problem of complicated operation of counterweight height adjustment after stroke adjustment in existing beam pumping units.

[0006] The technical solution of this utility model is achieved through the following measures: a counterweight adjustable pumping unit, including a walking beam pumping unit and a counterweight assembly connected to the balance donkey head of the walking beam pumping unit. The counterweight assembly includes a height adjustment component and a counterweight component. The counterweight component includes a first counterweight box, a second counterweight box and a third counterweight box that are detachably and fixedly installed together from top to bottom. Several guide plates are fixedly installed at intervals along the circumference on the upper side of the first counterweight box, the upper side of the second counterweight box and the upper side of the third counterweight box. The guide plates are U-shaped with downward openings, and the upper part of the guide plates is inclined from the inside to the outside from bottom to top. The height adjustment assembly includes a guide tube, a connecting rod, and a connecting pin. The guide tube is fixedly installed in the center of the first counterweight box. The connecting rod is fitted inside the guide tube. Several radially penetrating adjustment holes are provided at intervals on the outer side of the connecting rod. A radially penetrating connecting hole is provided on the upper outer side of the guide tube. A connecting pin is installed in the connecting hole, with the middle part located in one of the adjustment holes. The upper end of the connecting rod is connected to the left side of the balance donkey head.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution: The upper side of the second counterweight box and the upper side of the third counterweight box may be provided with an upper connecting groove corresponding to the guide plate. A first connecting plate is fixed in each upper connecting groove. The lower side of the first counterweight box and the lower side of the second counterweight box are provided with a lower connecting groove corresponding to the upper connecting groove. A second connecting plate is fixedly installed in each lower connecting groove. A connecting bolt with its upper end passing through the corresponding position of the second connecting plate is provided in each first connecting plate. A connecting nut is screwed onto the outer side of the upper part of each connecting bolt.

[0008] The second and third counterweight boxes can have the same structure. The second counterweight box has a closed filling cavity filled with counterweights. The front side of the first counterweight box has a front mounting groove, and several front counterweight units are arranged at intervals on the left and right sides in the front mounting groove. Each front counterweight unit includes several counterweight blocks stacked together from bottom to top. The rear side of the first counterweight box has a rear mounting groove, and the rear mounting groove contains a rear counterweight unit that is the same as the front counterweight unit.

[0009] The front side of the aforementioned first counterweight box may be provided with a front limiting mechanism, which includes an upper connecting ear, a lower connecting ear, a plug rod, and a pin. Four front counterweight groups are provided at left and right intervals in the front mounting groove. The upper front side of the first counterweight box corresponding to each front counterweight group position is fixed with an upper connecting ear. The lower front side of the first counterweight box is fixed with a lower connecting ear corresponding to the upper connecting ear. A plug rod with a pin at the bottom end passes through the lower connecting ear at the corresponding position through the upper connecting ear. A handle fitted on the outside of the plug rod is fixed on the front side of each counterweight block. The rear side of the first counterweight box is provided with a rear limiting mechanism with the same structure as the front limiting mechanism.

[0010] An unloading rack may be installed below the aforementioned third counterweight box.

[0011] The cross-section of the aforementioned guide tube can be square, and the cross-section of the connecting rod is circular. A bearing is provided on the outer side of the connecting rod corresponding to the upper position of the crossarm, and a locking nut is screwed onto the outer side of the upper part of the connecting rod corresponding to the upper end of the bearing.

[0012] The above may also include a wire rope, a crossbeam installed on the outer side of the upper end of the connecting rod, a U-shaped groove running vertically through the front and rear sides of the crossbeam, a supporting step on the inner side of the lower part of the U-shaped groove, a fixing sleeve fitted into the U-shaped groove at the first and second ends of the wire rope, the upper end of the fixing sleeve in contact with the supporting step, and the middle part of the wire rope connected to the left side of the balance donkey head.

[0013] This utility model has a reasonable and compact structure, with multiple adjustment holes. The adjustment can be made according to the stroke of the beam pumping unit. For example, when the stroke of the beam pumping unit is 3 meters, the connecting hole of the guide tube and the lowest adjustment hole of the connecting rod are connected together by a connecting pin. This reduces the distance between the counterweight component and the ground when it reaches its lowest point. When the stroke of the beam pumping unit is 5 meters, the connecting hole of the guide tube and the second adjustment hole from top to bottom of the connecting rod are connected together by a connecting pin. This ensures the distance between the counterweight component and the ground when it reaches its lowest point, preventing impact between the counterweight component and the ground. This ensures that the stroke adjustment of the counterweight component and the pumping unit do not interfere with each other. The adjustment holes also allow the counterweight component to be lowered to the ground during maintenance, and the connecting pin can be removed to separate the counterweight head from the counterweight component, reducing the difficulty of disassembling and assembling the counterweight component. Attached Figure Description

[0014] Appendix Figure 1 These are schematic diagrams of the main structure of embodiments one through seven of this utility model when in use.

[0015] Appendix Figure 2 This is a front view schematic diagram of the first and second counterweight boxes installed together in embodiments one to seven of this utility model.

[0016] Appendix Figure 3 This is a left-side view of the structure of the first and second counterweight boxes installed together in embodiments one through seven of this utility model.

[0017] Appendix Figure 4 This is a top sectional view of the first counterweight box in embodiments one through seven of this utility model.

[0018] Appendix Figure 5 This is a schematic diagram of the main cross-sectional structure of the second counterweight box in embodiments one to seven of this utility model.

[0019] Appendix Figure 6 This is a schematic diagram of the main sectional view of the connecting rod in embodiments one to seven of this utility model.

[0020] The codes in the attached diagram are as follows: 1 is a walking beam pumping unit, 2 is a balancer head, 3 is a guide tube, 4 is a connecting rod, 5 is a connecting pin, 6 is a crossbeam, 7 is a wire rope, 8 is an adjusting hole, 9 is a first counterweight box, 10 is a second counterweight box, 11 is a third counterweight box, 12 is a counterweight body, 13 is a front mounting groove, 14 is a counterweight block, 15 is a rear counterweight assembly, 16 is a guide plate, 17 is a first connecting plate, 18 is a second connecting plate, 19 is a connecting bolt, 20 is a connecting nut, 21 is an upper connecting lug, 22 is a lower connecting lug, 23 is an insert rod, 24 is a pin, 25 is a handle, 26 is a rear limiting mechanism, 27 is an unloading frame, 28 is a bearing, 29 is a locking nut, 30 is a support step, and 31 is a fixing sleeve. Detailed Implementation

[0021] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0022] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 , 2 As shown in Figures 3, 5, and 6, the adjustable counterweight pumping unit includes a beam pumping unit 1 and a counterweight assembly connected to the balance donkey head 2 of the beam pumping unit 1. The counterweight assembly includes a height adjustment component and a counterweight component. The counterweight component includes a first counterweight box 9, a second counterweight box 10, and a third counterweight box 11 that are detachably and fixedly installed together from top to bottom. Several guide plates 16 are fixedly installed circumferentially on the upper side of the first counterweight box 9, the upper side of the second counterweight box 10, and the upper side of the third counterweight box 11. The guide plates 16 are U-shaped with downward openings, and the upper part of the guide plates 16 is inclined from the inside to the outside from bottom to top. The height adjustment assembly includes a guide tube 3, a connecting rod 4, and a connecting pin 5. The guide tube 3 is fixedly installed in the center of the first counterweight box 9. The connecting rod 4 is fitted inside the guide tube 3. Several radially penetrating adjustment holes 8 are provided at intervals on the outer side of the connecting rod 4. A radially penetrating connecting hole is provided on the upper outer side of the guide tube 3. A connecting pin 5 located in one of the adjustment holes 8 is installed in the connecting hole. The upper end of the connecting rod 4 is connected to the left side of the balance donkey head 2.

[0024] According to the requirements, the walking beam pumping unit 1 is a well-known double-head walking beam pumping unit. The walking beam pumping unit 1 includes a bracket set on the base, a walking beam hinged to the upper end of the bracket, and working heads and balance heads installed at both ends of the walking beam. The base is equipped with a drive motor, a reducer, a crank assembly, and a connecting rod assembly connected together. The walking beam and the crank assembly are connected together through the connecting rod assembly. The connecting rod 4 is provided with 5 adjustment holes 8 at intervals. The distance between two adjacent adjustment holes 8 is 200mm, 300mm, 200mm, and 500mm from top to bottom. The upper end of the guide tube 3 and the connecting hole are located above the first counterweight box 9. The guide tube 3 can also be fixedly installed in the center of the second counterweight box 10 and the center of the third counterweight box 11.

[0025] During use, multiple adjustment holes 8 are provided to adjust the stroke of the beam pumping unit 1. For example, when the stroke of the beam pumping unit 1 is 3 meters, the connecting hole of the guide tube 3 and the lowest adjustment hole 8 of the connecting rod 4 are connected together by the connecting pin 5. This reduces the distance between the counterweight component and the ground when it reaches the lowest point. When the stroke of the beam pumping unit 1 is 5 meters, the connecting hole of the guide tube 3 and the second adjustment hole 8 from top to bottom of the connecting rod 4 are connected together by the connecting pin 5. This ensures the distance between the counterweight component and the ground when it reaches the lowest point, avoiding impact between the counterweight component and the ground. This ensures that the stroke adjustment of the counterweight component and the pumping unit do not interfere with each other. The setting of adjustment holes 8 also allows the counterweight component to be lowered to the ground during maintenance. Then, the connecting pin 5 can be removed to separate the counterweight head 2 from the counterweight component, reducing the difficulty of disassembling and assembling the counterweight component.

[0026] The first counterweight box 9, the second counterweight box 10, and the third counterweight box 11 can be detachably and fixedly installed together. One or more counterweight boxes can be connected according to the model of the pumping unit, so as to adapt to pumping units with various wellhead loads.

[0027] Four guide plates 16 are fixedly installed circumferentially on the upper sides of the first counterweight box 9, the second counterweight box 10, and the third counterweight box 11. The upper part of the guide plates 16 is inclined from bottom to top and from the inside to the outside. When the first counterweight box 9 is placed on the upper side of the second counterweight box 10, the guide plates 16 can guide the first counterweight box 9, so that the lower side of the first counterweight box 9 is aligned with the upper side of the second counterweight box 10. This makes it easy to connect the first counterweight box 9 and the second counterweight box 10 together. Similarly, when the first counterweight box 9 and the second counterweight box 10 are placed on the upper side of the third counterweight box 11, the guide plates 16 can guide the second counterweight box 10, so that the lower side of the second counterweight box 10 is aligned with the upper side of the third counterweight box 11. This makes it easy to connect the second counterweight box 10 and the third counterweight box 11 together. The guide plates 16 are U-shaped with the opening facing downwards, which can be used as lifting lugs when hoisting the counterweight boxes.

[0028] The above-mentioned adjustable counterweight pumping unit can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above examples, as shown in the appendix. Figures 2 to 5 As shown, the upper side of the second counterweight box 10 and the upper side of the third counterweight box 11 are provided with upper connecting grooves corresponding to the guide plate 16. A first connecting plate 17 is fixed in each upper connecting groove. The lower side of the first counterweight box 9 and the lower side of the second counterweight box 10 are provided with lower connecting grooves corresponding to the upper connecting grooves. A second connecting plate 18 is fixedly installed in each lower connecting groove. A connecting bolt 19 with its upper end passing through the corresponding position of the second connecting plate 18 is provided in each first connecting plate 17. A connecting nut 20 is screwed onto the outer side of the upper part of each connecting bolt 19.

[0029] The second connecting plate 18 on the lower side of the first counterweight box 9 is fixedly installed together with the corresponding first connecting plate 17 on the upper side of the second counterweight box 10 using connecting bolts 19 and connecting nuts 20. Similarly, the second connecting plate 18 on the lower side of the second counterweight box 10 is fixedly installed together with the corresponding first connecting plate 17 on the upper side of the third counterweight box 11 using connecting bolts 19 and connecting nuts 20. During use, the guide plate 16 is U-shaped with its opening facing downwards, facilitating the insertion of disassembly and assembly tools to disassemble and assemble the connecting nuts 20, thus simplifying the disassembly and assembly of the first counterweight box 9, the second counterweight box 10, and the third counterweight box 11.

[0030] Example 3: As an optimization of the above examples, as shown in the appendix. Figures 1 to 5 As shown, the second counterweight box 10 and the third counterweight box 11 have the same structure. The second counterweight box 10 has a closed filling cavity filled with counterweights 12. The front side of the first counterweight box 9 has a front mounting groove 13. Several front counterweight sets are arranged at intervals on the left and right sides in the front mounting groove 13. The front counterweight sets include several counterweight blocks 14 stacked together from bottom to top. The rear side of the first counterweight box 9 has a rear mounting groove. The rear mounting groove has a rear counterweight set 15 that is the same as the front counterweight set.

[0031] Depending on the requirements, the counterweight 12 can be formed by concrete filling the filling cavity, and the counterweight block 14 can be made of concrete or cast iron. Each counterweight block 14 weighs 17 kg to 21 kg, which makes it easy to make the counterweight box into a standard part, which is convenient for personnel to install and disassemble.

[0032] During balance adjustment, if the balance requirement cannot be met after the counterweight blocks 14 are fully added to the mounting slots, all counterweight blocks 14 are removed, and the second counterweight box 10 is installed together with the first counterweight box 9. Then, counterweight blocks 14 are added again. When the added counterweight blocks 14 meet the balance requirement, the balance adjustment operation is completed. If the balance requirement cannot be met after the counterweight blocks 14 are fully added, all counterweight blocks 14 are removed, and the third counterweight box 11 is installed together with the second counterweight box 10. Then, counterweight blocks 14 are added again until the balance requirement is met. Multiple third counterweight boxes 11 or multiple second counterweight boxes 10 can be set according to the model of the pumping unit, thus adapting to pumping units with wellhead loads greater than or equal to 30KN. In this application, when adjusting the counterweight, a single counterweight box (1T) is directly hung; the number of counterweight boxes hung depends on the required weight.

[0033] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 2 , 3 As shown in Figure 4, the front side of the first counterweight box 9 is provided with a front limiting mechanism, which includes an upper connecting ear 21, a lower connecting ear 22, a plug rod 23 and a pin 24. Four front counterweight groups are provided in the front mounting groove 13 at intervals on the left and right. The upper connecting ear 21 is fixed on the front side of the upper part of the first counterweight box 9 corresponding to the position of each front counterweight group. The lower connecting ear 22 corresponding to the upper connecting ear 21 is fixed on the front side of the lower part of the first counterweight box 9. A plug rod 23 with a pin 24 is provided after the lower end passes through the lower connecting ear 22 at the corresponding position in the upper connecting ear 21. A handle 25 fitted on the outside of the plug rod 23 is fixed on the front side of each counterweight block 14. The rear side of the first counterweight box 9 is provided with a rear limiting mechanism 26 with the same structure as the front limiting mechanism.

[0034] During use, the counterweight 14 can be limited by setting the front limit mechanism and the rear limit mechanism 26. When the first counterweight box 9 tilts or rotates, the counterweight 14 can be connected to the first counterweight box 9 to prevent the counterweight 14 from falling and causing the walking beam pumping unit 1 to lose balance, thus ensuring the stability of the walking beam pumping unit 1 during operation.

[0035] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, an unloading rack 27 is provided below the third counterweight box 11.

[0036] When not in use, the third counterweight box 11 or the second counterweight box 10 can be placed on the unloading rack 27. The unloading rack 27 has a disassembly and assembly through hole, which is convenient for the forklift forks to insert. In this way, the second counterweight box 10 or the third counterweight box 11 placed on the upper side of the unloading rack 27 can be transferred by forklift, reducing the labor intensity of disassembly and assembly.

[0037] Example 6: As an optimization of the above examples, as shown in the appendix Figure 1 ,2 As shown in Figures 3, 4, and 6, the cross-section of the guide tube 3 is square, and the cross-section of the connecting rod 4 is circular. A bearing 28 is provided on the outer side of the connecting rod 4 corresponding to the upper position of the crossarm 6, and a locking nut 29 is screwed onto the upper outer side of the connecting rod 4 corresponding to the upper position of the bearing 28.

[0038] Based on the requirements, bearing 28 is a known thrust bearing, and locking nut 29 is a known technology, such as a slotted nut. To prevent the locking nut 29 from loosening, a locking pin is installed between the locking nut 29 and the connecting rod 4. The guide tube 3 has a square cross-section and is a square tube. The connecting rod 4 has a circular cross-section and can be a round rod or a round tube. During use, bearing 28 is installed between the crossbeam 6 and the locking nut 29. This prevents the wire rope 7 from twisting and tangling when the counterweight box rotates during the operation of the beam pumping unit 1, reducing safety risks.

[0039] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 2 , 3 As shown in Figure 6, it also includes a steel wire rope 7. A crossbeam 6 is installed on the outer side of the upper end of the connecting rod 4. The front and rear sides of the crossbeam 6 are provided with U-shaped grooves that run vertically through each other. A support step 30 is provided on the inner side of the lower part of the U-shaped groove. The first and second ends of the steel wire rope 7 are fixed with a fixing sleeve 31 that is fitted into the U-shaped groove. The upper end of the fixing sleeve 31 is in contact with the support step 30. The middle part of the steel wire rope 7 is connected to the left side of the balance donkey head 2.

[0040] Depending on the requirements, the crossarm 6 uses existing known technology, such as a suspension rope device. During use, the U-shaped groove facilitates the assembly and disassembly of the fixing sleeve 31, and the support step 30 limits the positioning of the fixing sleeve 31. Thus, under the weight of the counterweight box and the tension of the wire rope 7, the fixing sleeve 31 presses against the support step 30. The fixing sleeve 31 can be an aluminum sleeve of the wire rope fixed to the first and second ends of the wire rope 7.

[0041] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A counterweight adjustable pumping unit, comprising a beam pumping unit and a counterweight assembly connected to the balance head of the beam pumping unit, characterized in that... The counterweight assembly includes a height adjustment component and a counterweight component. The counterweight component includes a first counterweight box, a second counterweight box, and a third counterweight box that are detachably and fixedly installed together from top to bottom. Several guide plates are fixedly installed at intervals along the circumference on the upper side of the first counterweight box, the upper side of the second counterweight box, and the upper side of the third counterweight box. The guide plates are U-shaped with downward openings, and the upper part of the guide plates is inclined from the inside to the outside from bottom to top. The height adjustment assembly includes a guide tube, a connecting rod, and a connecting pin. The guide tube is fixedly installed in the center of the first counterweight box. The connecting rod is fitted inside the guide tube. Several radially penetrating adjustment holes are provided at intervals on the outer side of the connecting rod. A radially penetrating connecting hole is provided on the upper outer side of the guide tube. A connecting pin is installed in the connecting hole, with the middle part located in one of the adjustment holes. The upper end of the connecting rod is connected to the left side of the balance donkey head.

2. The adjustable counterweight oil pumping unit according to claim 1, characterized in that... The upper sides of the second and third counterweight boxes are provided with upper connecting grooves corresponding to the guide plates. Each upper connecting groove is fixed with a first connecting plate. The lower sides of the first and second counterweight boxes are provided with lower connecting grooves corresponding to the upper connecting grooves. Each lower connecting groove is fixed with a second connecting plate. Each first connecting plate is provided with a connecting bolt whose upper end passes through the corresponding position of the second connecting plate. Each connecting bolt is screwed with a connecting nut on its upper outer side.

3. The adjustable counterweight oil pumping unit according to claim 1 or 2, characterized in that... The second and third counterweight boxes have the same structure. The second counterweight box has a closed filling cavity filled with counterweights. The front of the first counterweight box has a front mounting groove with several front counterweight units spaced apart on the left and right. Each front counterweight unit includes several counterweight blocks stacked together from bottom to top. The rear of the first counterweight box has a rear mounting groove with a rear counterweight unit identical to the front counterweight units.

4. The adjustable counterweight oil pumping unit according to claim 3, characterized in that... The front side of the first counterweight box is provided with a front limiting mechanism, which includes an upper connecting ear, a lower connecting ear, a plug rod and a pin. Four front counterweight groups are arranged at intervals on the left and right sides in the front mounting groove. The upper front side of the first counterweight box corresponding to each front counterweight group position is fixed with an upper connecting ear. The lower front side of the first counterweight box is fixed with a lower connecting ear corresponding to the upper connecting ear. A plug rod with a pin at the bottom end passes through the lower connecting ear at the corresponding position through the upper connecting ear. A handle fitted on the outside of the plug rod is fixed on the front side of each counterweight block. The rear side of the first counterweight box is provided with a rear limiting mechanism with the same structure as the front limiting mechanism. Or / and, an unloading rack is provided below the third counterweight box.

5. The adjustable counterweight oil pumping unit according to claim 1, 2, or 4, characterized in that... The guide tube has a square cross-section, and the connecting rod has a circular cross-section. A bearing is provided on the outer side of the connecting rod corresponding to the upper position of the crossarm, and a locking nut is screwed onto the upper outer side of the connecting rod corresponding to the upper end of the bearing.

6. The adjustable counterweight oil pumping unit according to claim 3, characterized in that... The guide tube has a square cross-section, and the connecting rod has a circular cross-section. A bearing is provided on the outer side of the connecting rod corresponding to the upper position of the crossarm, and a locking nut is screwed onto the upper outer side of the connecting rod corresponding to the upper end of the bearing.

7. The adjustable counterweight oil pumping unit according to claim 1, 2, 4, or 6, characterized in that... It also includes a steel wire rope, a crossbeam installed on the outer side of the upper end of the connecting rod, a U-shaped groove running vertically through the front and rear sides of the crossbeam, a support step on the inner side of the lower part of the U-shaped groove, a fixing sleeve fitted into the U-shaped groove at the first and second ends of the steel wire rope, the upper end of the fixing sleeve in contact with the support step, and the middle part of the steel wire rope connected to the left side of the balance donkey head.

8. The adjustable counterweight oil pumping unit according to claim 3, characterized in that... It also includes a steel wire rope, a crossbeam installed on the outer side of the upper end of the connecting rod, a U-shaped groove running vertically through the front and rear sides of the crossbeam, a support step on the inner side of the lower part of the U-shaped groove, a fixing sleeve fitted into the U-shaped groove at the first and second ends of the steel wire rope, the upper end of the fixing sleeve in contact with the support step, and the middle part of the steel wire rope connected to the left side of the balance donkey head.

9. The adjustable counterweight oil pumping unit according to claim 5, characterized in that... It also includes a steel wire rope, a crossbeam installed on the outer side of the upper end of the connecting rod, a U-shaped groove running vertically through the front and rear sides of the crossbeam, a support step on the inner side of the lower part of the U-shaped groove, a fixing sleeve fitted into the U-shaped groove at the first and second ends of the steel wire rope, the upper end of the fixing sleeve in contact with the support step, and the middle part of the steel wire rope connected to the left side of the balance donkey head.

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