Adjusting device and adjusting method for balance block of oil pumping unit

Abstract

The invention relates to the field of oil field pumping units, in particular to a pumping unit balance block adjusting device and method. The problems that an existing device for adjusting the balance block on the ground cannot meet different machine types, the whole operation process cannot be carried out on the ground, and operation is not safe are mainly solved. The bearing support (3) is connected with an upper bolt adjusting mechanism and a lower bolt adjusting mechanism, the lower bolt adjusting mechanism comprises a hydraulic jack (5), the hydraulic jack (5) is placed on the bearing support (3), and the upper portion of the hydraulic jack (5) is connected with a balance block tray (4); the upper bolt adjusting mechanism comprises a long lead screw (11), the long lead screw (11) penetrates through the bearing support (3) and then is connected with a long lead screw adjusting nut (12), and the top of the long lead screw (11) is connected with a solid wrench (9) through a connecting rod (10). The device does not need to climb in the operation process, all operations are carried out on the ground, and the device can be suitable for various models and is safe and reliable in operation.

Description

Technical Field

[0001] This invention relates to the field of oilfield pumping units, specifically to a pumping unit balance block adjustment device and adjustment method. Background Technology

[0002] During the operation of the pumping unit, alternating loads cause changes in the torque of the reducer and the load on the motor, leading to an imbalance between the two. To address this, the position of the balance block needs to be adjusted to regulate the motor load during the pumping unit's up and down strokes. However, as the downhole fluid production continuously changes, the balance of the pumping unit constantly shifts, causing load imbalances and motor current imbalances during the up and down strokes, reducing motor efficiency and shortening the service life of the pumping unit, motor, and sucker rod string. To avoid this situation, timely balancing operations of the pumping unit are necessary.

[0003] Balancing an oil pumping unit mainly involves adjusting the position of the balance weights on the upper part of the pumping unit crank to ensure that the work done by the pumping unit during the up and down strokes is equal and that the motor current is balanced. When adjusting the balance weights, operators typically need to stand on the pumping unit crank or gearbox to move the balance weights. This height is typically 2.5 to 3 meters, posing a risk of fall and injury to the operator.

[0004] Currently, there is another method for balancing, which involves adjusting the crank of the pumping unit to a vertical position for balancing operations. A crane or similar device is then used to move the balance block along the crank to a designated position, mitigating the risk of falls and injuries to operators working at heights. For example, patent number ZL201911070064.8, titled "A Balancing Method for Ground Balancing Equipment," allows for balance block adjustment on the ground. However, this method has the following problems: the hanging T-shaped crossarm and T-block have limited applicability and cannot meet the suspension chain hoisting requirements of different machine models; carrying and installing the hanging T-shaped crossarm, T-block, and crossarm-specific chain hoist still requires climbing, which cannot meet the need for operators to work entirely on the ground; pulling the balance block involves unilateral force, which may cause the 12-square U-shaped side hole to break, and the impact between the 12-square U-shaped lifting ring and the balance block during pulling can easily cause damage, making the operation unsafe. Summary of the Invention

[0005] To overcome the shortcomings of existing ground-based balance block adjustment devices, such as their inability to meet the needs of different machine models, their inability to complete the entire operation on the ground, and their unsafe operation, this invention provides a balance block adjustment device and method for oil pumping units. This device and method eliminates the need for climbing during operation, with all operations taking place on the ground. It is applicable to various machine models and is safe and reliable to operate.

[0006] The technical solution of the present invention is: a balance block adjustment device for an oil pumping unit, comprising a load-bearing bracket fixed on a crank, wherein an upper bolt adjustment mechanism and a lower bolt adjustment mechanism are respectively connected to the load-bearing bracket, the lower bolt adjustment mechanism comprising a hydraulic jack placed on the load-bearing bracket, the upper part of the hydraulic jack being connected to a balance block tray, the balance block tray being supported on the lower part of the balance block; the upper bolt adjustment mechanism comprising a long lead screw passing through the load-bearing bracket and connected to a long lead screw adjusting nut, the top of the long lead screw being connected to a wrench via a connecting rod, the other end of the wrench being connected to a fixed bolt on the balance block.

[0007] Furthermore, the load-bearing bracket is connected to the crank by fastening bolts, and a fixing key is connected to the load-bearing bracket, with the end of the fixing key located in the tooth groove of the crank.

[0008] Furthermore, the load-bearing bracket includes an upright plate, a horizontal plate is fixed on the front side of the upright plate, and a limiting block is fixed on the rear side, with the limiting block located in the groove of the crank.

[0009] Furthermore, the upright plate of the load-bearing bracket has fastening bolt holes for fixing the load-bearing bracket to the crank by fastening bolts; the horizontal plate of the load-bearing bracket has upper bolt adjustment mechanism fixing holes and lower bolt adjustment mechanism fixing holes, wherein the lower bolt adjustment mechanism fixing hole is located below the balance block and the upper bolt adjustment mechanism fixing hole is located on one side of the balance block.

[0010] Furthermore, an auxiliary support screw is connected to the load-bearing bracket, the lower end of the auxiliary support screw is connected to a ground support base, and an auxiliary screw adjusting nut is connected to the auxiliary support screw, with the auxiliary screw adjusting nut located at the bottom of the load-bearing bracket.

[0011] Furthermore, the hydraulic jack is a hollow hydraulic jack, and the upper end of the auxiliary support screw passes through the load-bearing bracket and is located inside the hydraulic jack.

[0012] Furthermore, the balance block tray is L-shaped, and the upper end of the L-shaped upright plate is an outwardly curved arc.

[0013] Furthermore, the long lead screw adjusting nut is connected to the load-bearing bracket via a rotating locking sleeve, so that the long lead screw adjusting nut is axially fixed and circumferentially rotated relative to the load-bearing bracket.

[0014] A method for adjusting the balance block of an oil pumping unit includes the following steps: S1. Determine the position where the balance weight needs to be adjusted, and stop the pumping unit crank in the vertically downward position; S2. Fix the load-bearing bracket at the position below the corresponding balance block at the bottom of the crank; S3. Connect the lower end of the auxiliary support screw to the ground support base, connect the upper end to the auxiliary screw adjusting nut, pass it through the load-bearing bracket, and adjust the position of the auxiliary screw adjusting nut so that it contacts the lower surface of the load-bearing bracket. S4. Fix the lower bolt adjustment mechanism on the load-bearing bracket, lift the hydraulic jack to make the balance block tray support the balance block, and loosen the lower fixing bolt of the balance block with a wrench. S5. Fix the upper bolt adjustment mechanism on the load-bearing bracket, and place the open-end wrench on the fixed bolt on the balance block. Rotate the long screw adjusting nut, and drive the fixed bolt on the balance block to rotate through the long screw and the open-end wrench to loosen the fixed bolt on the balance block. S6. Move the balance block to the predetermined position by lifting or lowering it using a hydraulic jack; S7. Turn the long lead screw adjusting nut in the opposite direction to tighten the fixing bolt on the balance block; use a wrench to tighten the fixing bolt on the lower balance block. S8. Remove the upper bolt adjustment mechanism, lower bolt adjustment mechanism, and auxiliary support screw in sequence, and remove the load-bearing bracket from the crank.

[0015] Furthermore, in step S4, when the lower bolt adjustment mechanism is fixed on the load-bearing bracket, the hydraulic jack sits on the load-bearing bracket after being sleeved outside the auxiliary support screw, the balance block tray is connected to the upper part of the hydraulic jack, and the balance block tray rests on the bottom edge of the balance block plane.

[0016] Furthermore, in step S5, when the upper bolt adjustment mechanism is fixed on the load-bearing bracket, firstly, the long screw adjusting nut is connected to the long screw and then passes through the load-bearing bracket from top to bottom, and the long screw adjusting nut is connected to the load-bearing bracket; then, the connecting rod is connected to the upper end of the long screw, and the open-end wrench is connected to the upper end of the connecting rod.

[0017] The present invention has the following beneficial effects: Due to the above-mentioned scheme, (1) the load-bearing bracket is fixed to the lower part of the crank of the pumping unit by fastening bolts and nuts, and cooperates with the hydraulic jack. The balance block is supported by the balance block tray, which has a wide range of applications and can meet the needs of different models for balancing. (2) One end of the load-bearing bracket is fixed on the crank, and the other end is supported on the ground by the auxiliary screw, which ensures the stability of the device. The balance block is supported by the balance block tray and the hydraulic jack to move up and down. The balance block is subjected to force as a whole during operation, and there is no risk of tilting or breaking due to unilateral force. In addition, during the adjustment process, the adjustment device will not collide with the balance block, thus avoiding damage to the balance block. (3) The installation process of the device and the adjustment process of the upper and lower fixing bolts of the balance block are all on the ground, without the need to climb, avoiding the inconvenience of high-altitude operation and ensuring safe operation. At the same time, the action of pulling the chain is converted into the action of tightening the bolt with a wrench, making the operation more labor-saving. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is the left view of the present invention; Figure 3 This is a schematic diagram after removing the upper bolt adjustment mechanism; Figure 4 This is a schematic diagram of a load-bearing support; Figure 5 This is the front view of the balance block tray; Figure 6 This is the right view of the balance block tray.

[0019] In the diagram, 1-fastening bolt, 2-nut, 3-load-bearing bracket, 4-balance block tray, 5-hydraulic jack, 6-auxiliary screw adjusting nut, 7-auxiliary support screw, 8-ground support base, 9-open-end wrench, 10-connecting rod, 11-long screw, 12-long screw adjusting nut, 13-fixing key, 14-lower fixing bolt of balance block, 15-upper fixing bolt of balance block, 16-balance block, 17-crank, 31-vertical plate, 32-keyway, 33-fastening bolt hole, 34-limiting block, 35-horizontal plate, 36-fixing hole for upper bolt adjusting mechanism, 37-fixing hole for lower bolt adjusting mechanism, 38-stiffening plate. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Depend on Figures 1 to 6As shown, a pumping unit balance block adjustment device includes a load-bearing bracket 3. During operation, the load-bearing bracket 3 is fixed to a crank 17 by fastening bolts 1, thereby fixing the entire adjustment device to the crank 17 for adjusting the balance block 16. An upper bolt adjustment mechanism and a lower bolt adjustment mechanism are respectively connected to the load-bearing bracket 3. The upper bolt adjustment mechanism is used to adjust the upper fixing bolt 15 of the balance block, and the lower bolt adjustment mechanism is used to adjust the lower fixing bolt 14 of the balance block. When adjusting the balance block, the upper and lower fixing bolts of the balance block are loosened using the upper and lower bolt adjustment mechanisms, the balance block is moved to the predetermined position, and then the upper and lower fixing bolts are tightened. The entire operation can be performed on the ground, without the need for climbing, ensuring safe operation.

[0023] The load-bearing support 3 includes an upright plate 31, such as Figure 4 As shown, a horizontal plate 35 perpendicular to the front side of the upright plate 31 is fixed, and two limiting blocks 34 are fixed to the rear side of the upright plate 31. The limiting blocks 34 are located in the groove of the crank 17 to prevent the load-bearing bracket 3 from moving horizontally. The upright plate 31 of the load-bearing bracket 3 has fastening bolt holes 33. When the load-bearing bracket 3 is connected to the crank 17, the fastening bolt 1 passes through the crank 17 and the fastening bolt holes 33, and is tightened by the nut 2, thereby fixing the load-bearing bracket 3 to the crank 17. A keyway 32 is opened on one side of the upright plate 31. During operation, the keyway 32 is aligned with a tooth groove on the crank, and the fixing key 13 passes through the keyway 32 and extends into the tooth groove of the crank 17 to limit the load-bearing bracket 3 longitudinally. The horizontal plate 35 of the load-bearing bracket 3 has an upper bolt adjustment mechanism fixing hole 36 and a lower bolt adjustment mechanism fixing hole 37. The horizontal plate 35 is T-shaped. The lower bolt adjustment mechanism fixing hole 37 and the vertical plate 31 are located at the two ends of the T-shaped horizontal plate, respectively, and the upper bolt adjustment mechanism fixing hole 36 is located at the end of the T-shaped vertical plate. When the load-bearing bracket 3 is fixed on the crank 17, the lower bolt adjustment mechanism fixing hole 37 is located directly below the balance block 16, and the upper bolt adjustment mechanism fixing hole 36 is located on one side of the balance block 16, and is a certain distance away from the balance block 16 in the horizontal direction.

[0024] When the load-bearing bracket 3 is fixed on the crank 17, an auxiliary support mechanism is connected to the lower end of the load-bearing bracket 3 to ensure its support strength. The auxiliary support mechanism includes an auxiliary support screw 7, the upper end of which passes through the fixing hole 37 of the lower bolt adjustment mechanism on the load-bearing bracket 3, and the lower end is connected to the ground support base 8. An auxiliary screw adjusting nut 6 is connected to the auxiliary support screw 7 and is located at the bottom of the load-bearing bracket 3. The ground support base 8 is placed on the ground. Adjusting the position of the auxiliary screw adjusting nut 6 so that it is tightly against the bottom surface of the load-bearing bracket 3 provides support for the load-bearing bracket 3, preventing all the force from being applied to the crank 17, thus making the device more stable and safer.

[0025] The lower bolt adjustment mechanism includes a hydraulic jack 5, which is a hollow hydraulic jack. A balance block tray 4 is connected to the upper part of the hydraulic jack 5. During operation, the hydraulic jack 5 is placed on the load-bearing bracket 3, with the upper end of the auxiliary support screw 7 located inside the hydraulic jack 5. The balance block tray 4 is supported by the lower part of the balance block 16. The auxiliary support screw 7 limits the horizontal movement of the hydraulic jack 5, preventing it from sliding on the load-bearing bracket 3. The balance block tray 4 is L-shaped. Figure 5 , Figure 6 As shown, the L-shaped base plate contacts the upper part of the hydraulic jack 5, and the upper part of the L-shaped vertical plate is an outwardly curved arc to match the shape of the bolt groove on the balance block 16. The base plate and the vertical plate are connected by tie rods to increase strength.

[0026] When adjusting the balance block 16, the hydraulic jack 5 is pushed up, causing the balance block tray 4 to lift the balance block 16 upwards. Since the balance block 16 is connected to the crank 17 by the balance block fixing bolt, the upward force of the hydraulic jack 5 will reduce the force on the balance block fixing bolt. Furthermore, the balance block tray 4 supports the balance block as a whole and moves it up and down, preventing the balance block from tilting due to force on one side.

[0027] The upper bolt adjustment mechanism includes a long lead screw 11, with a long lead screw adjusting nut 12 connected to it. The lower end of the long lead screw 11 passes through the upper bolt adjustment mechanism fixing hole 36 on the load-bearing bracket 3. The top of the long lead screw 11 is connected to a connecting rod 10, and the other end of the connecting rod 10 is connected to a wrench 9. The connecting rod and the wrench 9 can rotate relative to each other. During operation, the other end of the wrench 9 is connected to the fixing bolt 15 on the balance block. The long lead screw adjusting nut 12 can be connected to the load-bearing bracket 3 by rotating a locking sleeve, or the long lead screw adjusting nut 12 and the load-bearing bracket 3 can be axially limited by a limiting block. The purpose is to allow the long lead screw adjusting nut 12 and the load-bearing bracket 3 to rotate relative to each other but not move axially. When the long lead screw adjusting nut 12 is rotated, the long lead screw 11 can rotate and move up and down simultaneously, causing the connecting rod 10 to move up and down. The connecting rod 10 then drives the wrench 9 to rotate, thereby loosening or tightening the fixing bolt 15 on the balance block. Because the length of the open-end wrench 9 differs significantly from the sum of the lengths of the long lead screw 11 and the connecting rod 10, the long lead screw 11 and the connecting rod 10 can tilt slightly when the long lead screw adjusting nut 12 is turned, allowing the open-end wrench 9 to drive the fixing bolt 15 on the balance block to rotate. The oil pumping unit's balance block adjustment device supports the balance block 16 via a load-bearing bracket 3, a hydraulic jack 5, and a balance block tray 4, reducing the stress on the balance block fixing bolts and allowing them to be easily loosened. The lower fixing bolt 14 can be loosened with a wrench while standing on the ground, and the upper fixing bolt 15 can be loosened by rotating the long screw adjusting nut 12. The entire operation is performed on the ground, eliminating the need for climbing and significantly improving operational safety. Furthermore, the balance block 16 is supported by the device, resulting in overall stability and preventing tilting or breakage due to unilateral stress.

[0028] A method for adjusting the balance block of an oil pumping unit, using the aforementioned oil pumping unit balance block adjustment device, specifically includes the following steps: S1. Calculate the direction and specific position of the balance block to be adjusted by measuring the current during the upper and lower strokes of the pumping unit; press the pumping unit stop button when the pumping unit crank is near the vertical position, so that the pumping unit crank is stopped at a vertically downward position, and try to position the balance block directly below the crank; pull the brake to cut off the power, determine the adjustment position on the crank, and mark it.

[0029] S2. Fix the load-bearing bracket 3 at the position below the counterweight on the lower part of the crank. Estimate the height between the plane of the load-bearing bracket 3 and the bottom of the counterweight 16 so that the hydraulic jack 5 and the counterweight tray 4 can be placed, and the height does not exceed the support range of the hydraulic jack 5. The specific operation is as follows: put the limiting block 34 of the load-bearing bracket 3 into the slide groove of the crank. After the load-bearing bracket 3 is in the appropriate position, insert the fixing key 13 into the keyway 32 and make the end of the fixing key 13 enter a tooth groove of the crank 17. Then, insert the fastening bolt 1 into the fastening bolt hole 33 and tighten the nut 2.

[0030] S3. Connect the lower end of the auxiliary support screw 7 to the ground support base 8, and connect the upper end of the auxiliary support screw 7 to the auxiliary screw adjusting nut 6. Then, pass the auxiliary screw adjusting nut 6 through the fixing hole 37 of the lower bolt adjustment mechanism of the load-bearing bracket 3, and adjust the position of the auxiliary screw adjusting nut 6 so that it contacts the lower surface of the load-bearing bracket 3. In this way, the auxiliary screw adjusting nut 6 can provide support for the load-bearing bracket 3.

[0031] S4. Fix the lower bolt adjustment mechanism to the load-bearing bracket 3, with the hydraulic jack 5 placed on the load-bearing bracket 3 and the upper end of the auxiliary support screw 7 located inside the hydraulic jack 5. The balance block tray 4 is connected to the upper part of the hydraulic jack 5. Use a wrench to remove the crank locking teeth, adjust the hydraulic jack 5 to lift it up, so that the balance block tray 4 supports the bottom edge of the balance block 16, reducing the force on the lower fixing bolt 14 of the balance block. Use a wrench to loosen the lower fixing bolt 14 of the balance block.

[0032] S5. Fix the upper bolt adjustment mechanism to the load-bearing bracket 3. First, connect the long screw adjusting nut 12 to the long screw 11 and pass it through the load-bearing bracket 3 from top to bottom, then connect the long screw adjusting nut 12 to the load-bearing bracket 3. Connect the connecting rod 10 to the upper end of the long screw 11, and connect the open-end wrench 9 to the upper end of the connecting rod 10. Then, put the open-end wrench 9 on the fixing bolt 15 on the balance block. Rotate the long screw adjusting nut 12, which will drive the fixing bolt 15 on the balance block to rotate through the long screw 11 and the open-end wrench 9, thereby loosening the fixing bolt 15 on the balance block.

[0033] S6. After the upper and lower fixing bolts of the balance block are loosened, the balance block is moved to the predetermined position by lifting or lowering it using hydraulic jack 5, according to the pre-calculated movement distance of the balance block.

[0034] S7. Rotate the long lead screw adjusting nut 12 in the opposite direction. This will cause the open-end wrench 9 to rotate in the opposite direction via the long lead screw 11 and connecting rod 10, tightening the fixing bolt 15 on the balance block. Tighten the fixing bolt 14 on the lower balance block with a wrench, and then tighten the crank locking teeth.

[0035] S8. Remove the open-end wrench 9, connecting rod 10, and long screw 11 from the upper bolt adjustment mechanism in sequence. Then remove the balance block tray 4 and hydraulic jack 5 from the lower bolt adjustment mechanism. Remove the auxiliary support screw 7 from the load-bearing bracket 3 and remove the load-bearing bracket 3 from the crank 17.

[0036] Erase the adjustment marks on the crank, release the brake, and start the pumping unit according to the standard starting procedure. Observe whether the fixing bolts of the crank balance weight are loose. Determine the adjustment effect by measuring the upstroke and downstroke current of the pumping unit. If the requirements are not met, repeat the above adjustment steps. All the above operations are completed on the ground, and there is no danger of working at height.

[0037] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A pumping unit balance block adjustment device, comprising a load-bearing bracket (3), the load-bearing bracket (3) being fixed on a crank (17), characterized in that: The load-bearing bracket (3) is connected to an upper bolt adjustment mechanism and a lower bolt adjustment mechanism. The lower bolt adjustment mechanism includes a hydraulic jack (5), which is placed on the load-bearing bracket (3). The upper part of the hydraulic jack (5) is connected to a balance block tray (4), which is supported on the lower part of the balance block (16). The upper bolt adjustment mechanism includes a long screw (11), which passes through the load-bearing bracket (3) and is connected to a long screw adjusting nut (12). The top of the long screw (11) is connected to a wrench (9) through a connecting rod (10), and the other end of the wrench (9) is connected to a fixing bolt (15) on the balance block.

2. The oil pumping unit balance block adjustment device according to claim 1, characterized in that: The load-bearing bracket (3) is connected to the crank (17) by fastening bolts (1), and a fixing key (13) is connected to the load-bearing bracket (3), with the end of the fixing key (13) located in the tooth groove of the crank (17).

3. The oil pumping unit balance block adjustment device according to claim 2, characterized in that: The load-bearing bracket (3) includes a vertical plate (31), a horizontal plate (35) is fixed on the front side of the vertical plate (31), and a limiting block (34) is fixed on the rear side. The limiting block (34) is located in the groove of the crank (17).

4. The oil pumping unit balance block adjustment device according to claim 3, characterized in that: The upright plate (31) of the load-bearing bracket (3) has fastening bolt holes (33) for fixing the load-bearing bracket (3) to the crank (17) by fastening bolts (1); the horizontal plate (35) of the load-bearing bracket (3) has upper bolt adjustment mechanism fixing holes (36) and lower bolt adjustment mechanism fixing holes (37), wherein the lower bolt adjustment mechanism fixing hole (37) is located below the balance block (16), and the upper bolt adjustment mechanism fixing hole (36) is located on one side of the balance block (16).

5. The oil pumping unit balance block adjustment device according to claim 1, characterized in that: The load-bearing bracket (3) is connected to an auxiliary support screw (7), the lower end of the auxiliary support screw (7) is connected to a ground support base (8), and the auxiliary support screw (7) is connected to an auxiliary screw adjusting nut (6), which is located at the bottom of the load-bearing bracket (3).

6. The oil pumping unit balance block adjustment device according to claim 5, characterized in that: The hydraulic jack (5) is a hollow hydraulic jack, and the upper end of the auxiliary support screw (7) passes through the load-bearing bracket (3) and is located inside the hydraulic jack (5).

7. The oil pumping unit balance block adjustment device according to claim 6, characterized in that: The balance block tray (4) is L-shaped, and the upper end of the L-shaped upright plate is an outwardly curved arc.

8. The oil pumping unit balance block adjustment device according to claim 1, characterized in that: The long screw adjusting nut (12) is connected to the load-bearing bracket (3) through a rotating locking sleeve, so that the long screw adjusting nut (12) is axially fixed and circumferentially rotated relative to the load-bearing bracket (3).

9. A method for adjusting the balance block of an oil pumping unit, characterized in that... Includes the following steps: S1. Determine the position where the balance weight needs to be adjusted, and stop the pumping unit crank in the vertically downward position; S2. Fix the load-bearing bracket (3) at the position below the corresponding balance block at the bottom of the crank; S3. Connect the lower end of the auxiliary support screw (7) to the ground support base (8), connect the upper end to the auxiliary screw adjusting nut (6), and pass it through the load-bearing bracket (3). Adjust the position of the auxiliary screw adjusting nut (6) so that it contacts the lower surface of the load-bearing bracket (3). S4. Fix the lower bolt adjustment mechanism on the load-bearing bracket (3), and use the hydraulic jack (5) to push up so that the balance block tray (4) supports the balance block (16). Use a wrench to loosen the lower fixing bolt (14) of the balance block. S5. Fix the upper bolt adjustment mechanism on the load-bearing bracket (3), and put the open wrench (9) on the fixed bolt (15) on the balance block. Rotate the long screw adjusting nut (12) to drive the fixed bolt (15) on the balance block to rotate through the long screw (11) and the open wrench (9) to loosen the fixed bolt (15) on the balance block. S6. Move the balance block to the predetermined position by lifting or lowering it using the hydraulic jack (5); S7. Rotate the long lead screw adjusting nut (12) in the opposite direction to tighten the fixing bolt (15) on the balance block; use a wrench to tighten the fixing bolt (14) on the lower balance block; S8. Remove the upper bolt adjustment mechanism, the lower bolt adjustment mechanism, and the auxiliary support screw (7) in sequence, and remove the load-bearing bracket (3) from the crank (17).

10. The method for adjusting the balance block of an oil pumping unit according to claim 9, characterized in that: In step S4, when the lower bolt adjustment mechanism is fixed on the load-bearing bracket (3), the hydraulic jack (5) is placed on the outside of the auxiliary support screw (7) and sits on the load-bearing bracket (3), connecting the balance block tray (4) to the upper part of the hydraulic jack (5) and making the balance block tray (4) rest on the edge of the bottom plane of the balance block.

11. The method for adjusting the balance block of an oil pumping unit according to claim 9, characterized in that: In step S5, when the upper bolt adjustment mechanism is fixed on the load-bearing bracket (3), firstly, the long screw adjusting nut (12) is connected to the long screw (11) and then passes through the load-bearing bracket (3) from top to bottom, and the long screw adjusting nut (12) is connected to the load-bearing bracket (3); the connecting rod (10) is connected to the upper end of the long screw (11), and the open wrench (9) is connected to the upper end of the connecting rod (10).

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