Balancing weight electric adjusting device for beam pumping unit

Abstract

The utility model discloses a beam -pumping unit balance weight electric adjusting device, and its balance weight hoisting mechanism and crane fixed establishment are fixed at the both ends of crank respectively, the balance weight hoisting mechanism both sides are equipped with the pulley's crane arm and are fixed in the crank groove of one end of crank through crane arm positioning block and crane arm fixed bolt, the output shaft of motor in light -duty hoist crane is connected with the drum of being equipped with steel wire rope, and the hanger ring of the balance weight support plate of balance weight below installation in the crank groove is connected with the steel wire rope from the pulley on the top, and the rotation direction of remote control motor is made through the remote controller, and balance weight moves along the adjusting direction in the crank of longitudinal inclination. Solveed the problem of the safety hidden danger of high altitude operation of the balance adjusting tool of current pumping unit and the problem of high production cost of using crane to adjust balance and being restricted by various factors. Effectively improved the safety and work efficiency of balance weight adjusting work, and the operation is convenient, and has remarkable use effect.

Description

Technical Field

[0001] This utility model relates to a special device for balancing oil well pumping units, and in particular to an electric adjustment device for the balance block of a beam pumping unit. Background Technology

[0002] The balance weight installed on the crank of a beam pumping unit is a component used to adjust the balance of fluid volume between the pumping unit and the downhole rod string and tubing, ensuring that the pumping unit on the surface always operates in a balanced state with the fluid volume in the downhole rod string and tubing. During oil well production, changes in fluid production and adjustments to the rod string and tubing can cause the pumping unit to become unbalanced, thus accelerating wear on downhole equipment, causing pumping unit belt slippage, and motor burnout. To ensure normal oil well production, oil production personnel must promptly perform balancing operations on the pumping unit.

[0003] For beam pumping units that are balanced using counterweights installed in the crank, the conventional balancing operation involves stopping the crank at a near-horizontal position, removing the counterweight locking blocks and fixing bolts, and then the operator standing on an external platform of the pumping unit to move the counterweights to the designated position using a crank handle. However, because the pumping unit manufacturer's equipment does not include a platform, there is no operating platform on the outside of the pumping unit's crank at the operation site, rendering the original dedicated counterweight moving tool, the crank handle, unusable.

[0004] Currently, the typical method for balancing an oil pumping unit involves stopping the crank in a near-ground-level position, removing the locking blocks and loosening the balance block fixing bolts, and then using a pry bar to move the balance blocks to a position that allows the crank to be balanced. This operation is not only time-consuming and labor-intensive, but also involves working at height, with no place to attach the safety belt, making it prone to accidents.

[0005] To avoid safety accidents, cranes are currently used on production sites to balance the balancing blocks. However, the cost of using cranes is high, and it is difficult to improve the balancing efficiency of oil well pumping units in case of rain, snow, or when the well site roads are inaccessible.

[0006] In summary, the main problems with balancing pumping units are as follows: First, oil well production conditions are complex, wellbore loads vary significantly, and rod weights can change frequently, making balancing work quite frequent. Second, using existing specialized tools for balancing requires working at heights, where safety belts cannot be properly suspended, posing a safety hazard. Third, using cranes for balancing is costly, and personnel cannot stand under the crane boom, presenting not only safety risks but also limitations imposed by weather conditions.

[0007] To address the above issues, on-site staff undertook numerous tasks, and after research, the following related technologies were also identified:

[0008] Patent application CN201420389319.3 discloses a "novel split-type moving device for the balance block of an oil pumping unit." The technical solution is as follows: A crank upper groove is provided at the top of the crank body; a moving rack belt is provided on one side of the top of the crank upper groove, and the other side is a smooth surface; the balance block contacts the top of the crank upper groove through a balance block base at the bottom, and the balance block base is fixed to the crank body by fixing bolts and the crank upper groove; a semi-circular balance block gear hole is provided at the center of the bottom of the balance block, and a moving gear is placed in the balance block gear hole to drive the balance block to move. The advantages are: by installing the balance block at the top of the crank body, and placing the balance block base on the moving rack belt and the smooth surface, the balance block moves through the meshing of the moving gear with the moving rack belt on one side; the smooth surface on the other side reduces resistance and improves the moving efficiency; in addition, the split design makes the device more convenient to store and operate.

[0009] The aforementioned device is a special balancing tool developed for situations where there are no operating platforms on either side of the pumping unit. The balancing operation involves stopping the crank in a near-horizontal position, removing the locking block, loosening the balancing block fixing screws, and then using the developed tool to move the balancing block into place. This operation is not only time-consuming and labor-intensive, but also involves working at height, with no place to hang the safety belt, which can easily lead to safety accidents.

[0010] Patent application CN201721224906.7 discloses a "hydraulic walking beam pumping unit balance adjustment device," which includes a hydraulic cylinder, a balance block elevation fixing block, a connecting ring, a double-acting hydraulic cylinder fixing seat, a double-acting hydraulic cylinder, and a double-acting hydraulic pump. This device uses hydraulic means to move the balance block, avoiding the previous operation that required two people to shake the balance block and one person to move it with a crowbar. This reduces the number of operators, lowers the labor intensity of workers, and shortens the operation time. It solves the problems of operators being prone to falls from heights and the time-consuming and labor-intensive nature of balance adjustment operations on walking beam pumping units. It improves operator safety, reduces worker labor intensity, and achieves the goals of increasing work efficiency and safety.

[0011] However, the aforementioned device is a hydraulic balancing tool developed for situations where there are no operating platforms on either side of the pumping unit. Balancing with this tool involves stopping the crank in a near-ground-level position, installing the hydraulic cylinder, removing the locking block, and loosening the balance block's fixing screws. Then, the balance block is moved by pressurizing the pump station and pushing with the hydraulic cylinder. This operation occupies a certain position on the crank, and the balance block cannot be adjusted throughout the crank's full range of motion; therefore, further improvement is needed. Summary of the Invention

[0012] The purpose of this invention is to provide an electric adjustment device for the balance block of a beam pumping unit, solving the safety hazards of high-altitude operations and the high production costs and various constraints associated with using cranes for balance adjustment in current pumping unit balancing tools. This improves the safety and efficiency of balance block adjustment, simplifies operation, reduces the labor intensity of workers, minimizes well downtime, and increases production efficiency.

[0013] The technical solution of this utility model is: an electric adjustment device for the balance block of a beam pumping unit, wherein: the balance block hoisting mechanism and the crane fixing mechanism are respectively fixed at both ends of the crank; the boom with pulleys on both sides in the balance block hoisting mechanism is fixed in the crank groove at one end of the crank by boom positioning blocks and boom fixing bolts; the balance block support plate with lifting rings on both sides is installed in the crank groove below the balance block by anti-detachment pins; the light-duty crane is fixed in the crank groove at the other end of the crank by the crane fixing base in the crane fixing mechanism; the output shaft of the motor in the light-duty crane is connected to a drum with a wire rope, and the wire rope passes over the pulley and connects to the lifting rings of the balance block support plate installed in the crank groove below the balance block; the rotation direction of the motor is remotely controlled by a remote controller, so that the balance block moves along the adjustment direction in the longitudinally inclined crank.

[0014] Preferably, both sides of the drum are provided with wire rope grooves, and wire ropes are installed in the wire rope grooves on both sides; the power cord of the motor can be connected to the 220V power terminal in the well site control cabinet or to a mobile power supply; the lifting weight of the motor is 2.5 tons to 3.5 tons.

[0015] Preferably, the boom is a T-shaped block and consists of a crossbeam with an adjustment slot and a boom positioning block welded below. The boom positioning block also has positioning wing plates on both sides. The structure formed by the boom positioning block and the two side positioning wing plates conforms to the groove structure of the crank groove. The boom positioning block also has threaded holes in the block and can accommodate boom fixing bolts.

[0016] Preferably, the boom fixing bolt is provided with a rotating handle on the outside, and the width of the rotating handle is greater than the width of the crank groove.

[0017] Preferably, the crossbeam of the boom rests on the end face of one end of the crank, the boom positioning block and the positioning wing plates on both sides are inserted into the crank groove at one end of the crank and the boom is fixed to one end of the crank by boom fixing bolts; the width of the crossbeam is 30cm-50cm larger than the width of the crank, and the length of the boom positioning block and the positioning wing plates is set between 30cm and 50cm.

[0018] Preferably, the adjusting slot in the crossbeam can accommodate two tie rods with anti-slip caps and lifting rings welded to both ends. The outer diameter of the anti-slip caps is larger than the width of the adjusting slot. The two tie rods are located on both sides of the crank and can move within the adjusting slot of the crossbeam.

[0019] Preferably, both lifting rings are connected to pulleys via hooks, and two wire ropes from the wire rope grooves pass over the two pulleys respectively.

[0020] Preferably, the balance block support plate is provided with lifting rings on both sides and a threaded hole in the middle of the plate body for inserting anti-detachment pins; the outer diameter of the pin cap of the anti-detachment pin matches the width of the bottom of the crank groove, and the outer diameter of the pin of the anti-detachment pin is smaller than the width of the upper part of the crank groove; the two lifting rings are respectively connected to the hooks fixed at the lower ends of the two steel wire ropes that are wrapped around the two pulleys.

[0021] Preferably, the front side of the crane mounting base is provided with a motor support plate, and the motor is fixed to the motor support plate by fixing bolts; the rear side of the crane mounting base is provided with a base positioning block, and base wing plates are respectively provided on both sides of the rear side of the base positioning block; the structure formed by the base positioning block and the base wing plates conforms to the groove structure of the crank groove and can be inserted into the crank groove; the upper and lower ends of the base positioning block are respectively provided with threaded holes, and upper fixing bolts and lower fixing bolts can be respectively installed; the upper fixing bolts and lower fixing bolts are provided with rotating handles on the outside, and the width of the rotating handles is greater than the groove width of the crank groove.

[0022] Preferably, the balance block hoisting mechanism is installed at the crankshaft end, and the crane fixing mechanism that fixes the light-duty crane is installed on the front or back of the crank end.

[0023] The significant advantages of this utility model are:

[0024] This invention uses a light-duty crane with a lifting capacity of approximately 3 tons as the power source for balancing. To ensure smooth movement of the balance weight, the original crane's drum, which had only one wire rope groove and one wire rope, is replaced with two wire rope grooves and two wire ropes. The motor drives the drum, and the balance weight moves via the two wire ropes. The operator can remotely operate the crane's built-in braking system using a wireless remote control, allowing the balance weight to be suspended at any position within the crank, ensuring safety and reliability.

[0025] This invention changes the current method of horizontal balancing of oil pumping units, eliminating the need for working at heights. It employs a longitudinal tilting method for installation and balancing on the crankshaft. The end of the oil pumping unit crank can be positioned close to the ground. First, using a 30cm-50cm high housing, the balance block hoisting mechanism is inserted into the crankshaft end, and then the crane fixing mechanism is installed. This eliminates the need to climb onto the crankshaft for operation. When disassembling the locking blocks and loosening the fixing nuts in the balance blocks, if the position is high, a 30cm-50cm high housing or a long-handled wrench can be used. Moving the balance blocks can be wirelessly remotely driven by a crane, keeping operators away from dangerous areas and eliminating potential safety hazards.

[0026] The counterweight weighs approximately 1.5 tons, allowing for the use of a crane with a lifting capacity of around 3 tons, ensuring safe and reliable operation. This invention changes the current method of using a crane to adjust the counterweight, saving production costs and eliminating the constraints imposed by weather conditions. It is also applicable to beam pumping units that use cranks and counterweights for balancing.

[0027] This invention solves the safety hazards of high-altitude operations and the high production costs and various constraints associated with using cranes for balancing oil pumping units. It effectively improves the safety and efficiency of balancing block adjustment, is easy to operate, reduces the labor intensity of workers, minimizes well downtime, and increases production efficiency, demonstrating significant effectiveness and generating good economic benefits. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a front view of the structural schematic diagram of this utility model.

[0029] Figure 2 for Figure 1 The left view.

[0030] Figure 3 for Figure 1 and Figure 2 The diagram shows the structure of the crane's fixed base and the light-duty crane.

[0031] Figure 4 for Figure 3 A bottom view.

[0032] Figure 5 This is an enlarged schematic diagram of the counterweight hoisting mechanism.

[0033] Figure 6 for Figure 5 The left view.

[0034] Figure 7 for Figure 5 Top view.

[0035] Figure 8 for Figure 5 A bottom view.

[0036] Figure 9 This is a schematic diagram of the counterweight support plate in the crane fixing mechanism.

[0037] Figure 10 for Figure 9 The left view.

[0038] In the picture:

[0039] Oil pumping unit components: crank 1, balance weight 8, crank groove 22, crank teeth 23;

[0040] Light-duty crane 2: motor 2-1, power cord 2-2, drum 2-3, wire rope groove 2-4, wire rope 2-5;

[0041] Crane fixing mechanism: Crane fixing base 3, motor support plate 3-1, base wing plate 4, base positioning block 5, upper fixing bolt 6, lower fixing bolt 7;

[0042] Balance block hoisting mechanism: boom 9, anti-detachment cap 10, boom fixing bolt 11, tie rod 12, lifting ring one 13, positioning wing plate 14, boom positioning block 15, hook 16, pulley 17, hook 18, lifting ring two 19, balance block support plate 20, anti-detachment pin 21. Detailed Implementation

[0043] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0045] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] See Figures 1-10 An electric adjustment device for the balance block of a beam pumping unit, wherein: a balance block hoisting mechanism and a crane fixing mechanism are respectively fixed at both ends of a crank 1; the boom 9 of the balance block hoisting mechanism, which is equipped with pulleys 17 on both sides, is fixed in the crank groove 22 at one end of the crank 1 by a boom positioning block 15 and a boom fixing bolt 11; the balance block support plate 20, which is equipped with lifting rings 19 on both sides, is installed in the crank groove 22 below the balance block 8 by anti-detachment pins 21; the light-duty crane 2 is fixed in the crank groove 22 at the other end of the crank 1 by a crane fixing base 3 in the crane fixing mechanism; the output shaft of the motor 2-1 in the light-duty crane 2 is connected to a drum 2-3 equipped with a wire rope 2-5, and the wire rope 2-5 passes over the pulleys 17 and connects to the lifting rings 19 of the balance block support plate 20 installed in the crank groove 22 below the balance block 8; the rotation direction of the motor 2-1 is remotely controlled by a remote controller, so that the balance block 8 moves along the adjustment direction in the longitudinally inclined crank 1.

[0047] This utility model consists of the following parts: a counterweight hoisting mechanism, a crane fixing mechanism, and a light-duty crane 2. The light-duty crane 2 is fixed on the crane fixing base 3 in the crane fixing mechanism. The counterweight hoisting mechanism and the crane fixing mechanism are respectively fixed at both ends of the crank 1, without occupying the adjustment space of the crank 1, allowing the counterweight 8 to be adjusted throughout the crank 1.

[0048] The light-duty crane 2 is existing technology, featuring a self-locking brake and remote control function. It can be purchased on the market or customized from the manufacturer according to needs. The rotation direction of the motor 2-1 can be controlled by a remote control, causing the balance block 8 installed in the crank 1 to move in the desired direction by the wire rope 2-5. The balance block 8 in the crank 1 can stop and move forward or backward at any position, making adjustment very convenient and precise.

[0049] By adjusting crank 1 on the pumping unit, the end requiring installation in crank 1 is positioned close to the ground. When disassembling the locking block and loosening the fixing nut in the balance block 8, if the balance block 8 is positioned high, a 30cm-50cm high box or a long-handled special wrench can be used, eliminating the need for climbing. Operators do not need to stand under crank 1, greatly eliminating the safety hazards of existing adjustment methods. While ensuring operator safety, this effectively improves the efficiency of balance block adjustment and significantly reduces operator workload. Furthermore, the lightweight lifting crane 2 is compact, lightweight, low-cost, and easy to carry, unaffected by weather or road conditions, effectively improving the efficiency of pumping unit balance adjustments, reducing well downtime, and demonstrating significant effectiveness.

[0050] Based on the above embodiment one, the present invention also has the following embodiments:

[0051] In a preferred embodiment: both sides of the drum 2-3 are provided with wire rope grooves 2-4, and each of the wire rope grooves 2-4 on both sides is equipped with a wire rope 2-5; the power cord 2-2 of the motor 2-1 can be connected to the 220V power terminal in the well site control cabinet or to a mobile power supply; the lifting weight of the motor 2-1 is 2.5 tons to 3.5 tons. In this utility model, the drum 2-3 of the light-duty crane 2 is provided with wire rope grooves 2-4 on both sides and is equipped with wire ropes 2-5. The balance block 8 is lifted by two wire ropes 2-5, making its movement more stable and further improving the working reliability of the device. The weight of the balance block 8 is about 1.5 tons, and the lifting weight of the crane is about 3 tons, making operation safe and reliable. Operators do not need to work at heights and can stay away from dangerous areas, eliminating potential accidents. It is universal for beam pumping units using crank balancing.

[0052] In a preferred embodiment, the boom 9 is a T-shaped block and consists of a crossbeam with an adjustment slot and a boom positioning block 15 welded below. The boom positioning block 15 is also provided with positioning wing plates 14 on both sides. The structure formed by the boom positioning block 15 and the two side positioning wing plates 14 is consistent with the groove structure of the crank groove 22. The boom positioning block 15 is also provided with threaded holes that can be used to install boom fixing bolts 11.

[0053] In a preferred embodiment, the boom fixing bolt 11 has a rotating handle on its exterior, the width of which is greater than the width of the crank groove 22. This allows the boom 9 to be fixed to the upper end of the crank groove 22 without the need for additional tools.

[0054] In a preferred embodiment: the crossbeam of the boom 9 rests against the end face of one end of the crank 1; the boom positioning block 15 and the positioning wing plates 14 on both sides are inserted into the crank groove 22 at one end of the crank 1, and the boom 9 is fixed to one end of the crank 1 by boom fixing bolts 11; the width of the crossbeam is 30cm-50cm larger than the width of the crank 1, and the length of the boom positioning block 15 and the positioning wing plates 14 is set between 30cm and 50cm to ensure the reliability of its installation and fixation. 。

[0055] In a preferred embodiment, two tie rods 12, each with an anti-slip cap 10 and a lifting ring 13 welded to both ends, can be installed in the adjustment slot of the crossbeam. The outer diameter of the anti-slip cap 10 is larger than the width of the adjustment slot. The two tie rods 12 are located on both sides of the crank 1 and can move within the adjustment slot of the crossbeam.

[0056] In a preferred embodiment, both lifting rings 13 are connected to pulleys 17 via hooks 16, and two wire ropes 2-5 from the wire rope grooves 2-4 pass over the two pulleys 17 respectively. Connecting the lifting rings 13 to the pulleys 17 via hooks 16 facilitates disassembly and installation.

[0057] A preferred embodiment: see Figure 9 and Figure 10 The balance block support plate 20 has lifting rings 19 on both sides and a threaded hole in the middle of the plate for inserting anti-detachment pins 21. The outer diameter of the pin cap of the anti-detachment pin 21 matches the width of the bottom of the crank groove 22, and the outer diameter of the pin of the anti-detachment pin 21 is smaller than the width of the upper part of the crank groove 22. The two lifting rings 19 are respectively connected to the hooks 18 fixed at the lower ends of the two steel wire ropes 2-5 that are wrapped around the two pulleys 17. When the balance block 8 is lifted by the lifting rings 19 on both sides of the balance block support plate 20, due to the presence of the anti-detachment pins 21, it will move along the crank groove 22 and the crank teeth 23 on the upper side without deviating, further ensuring the reliability of the device.

[0058] A preferred embodiment: see Figure 3 and Figure 4The crane mounting base 3 has a motor support plate 3-1 on its front side, and the motor 2-1 is fixed to the motor support plate 3-1 by fixing bolts. The crane mounting base 3 has a base positioning block 5 on its rear side, and base wing plates 4 are respectively provided on both sides of the rear side of the base positioning block 5. The structure formed by the base positioning block 5 and the base wing plates 4 conforms to the groove structure of the crank groove 22 and can be inserted into the crank groove 22. The upper and lower ends of the base positioning block 5 are respectively provided with threaded holes, which can respectively accommodate upper fixing bolts 6 and lower fixing bolts 7. The upper fixing bolts 6 and lower fixing bolts 7 are provided with rotating handles on their exterior, and the width of the rotating handles is greater than the width of the crank groove 22. The crane mounting base 3 can be fixed to the lower end of the crank groove 22 without the use of other tools.

[0059] In a preferred embodiment: the counterweight hoisting mechanism is installed at the shaft end of crank 1, and the crane fixing mechanism that secures the light-duty crane 2 is installed on the front or back of the end of crank 1. Because the counterweight hoisting mechanism and the crane fixing mechanism are connected by steel wire rope 2-5, the crane fixing mechanism can be installed on the front or back of the end of crank 1, as shown below. Figure 2 As shown. Because the position of crank 1 cannot be repeatedly adjusted, the balance weight hoisting mechanism is very light and can be inserted into the shaft end of crank 1 with the help of a housing with a height of 30cm-50cm; while the crane fixing mechanism is relatively heavy because it fixes the light lifting crane 2, so the end of crank 1 is stopped at a position close to the ground for easy installation.

[0060] This invention provides a dedicated operating device for balancing the crankshaft of a beam pumping unit in the petroleum industry. To avoid working at heights, when installing the balance block hoisting mechanism and the crane fixing mechanism, the end of the crank 1 can be adjusted close to the ground using the pumping unit. First, using a housing 30cm-50cm high, the balance block hoisting mechanism is inserted into the crankshaft end, and then the crane fixing mechanism is installed, eliminating the need for working at heights. When disassembling the locking blocks and loosening the fixing nuts in the balance block, if the position is high, a housing 30cm-50cm high or a long-handled special wrench can also be used.

[0061] After installing the balance block hoisting mechanism and the crane fixing mechanism at both ends of the crank 1, remotely control the light lifting crane 2 to extend the wire rope 2-5, hang the hook 16 on the lifting ring 13, then install the balance block support plate 20, and hang the two hooks 18 at the lower end of the two wire ropes 2-5 on the two lifting rings 19 respectively.

[0062] The remote-controlled light lifting crane 2 shortens the wire rope 2-5 until it fully bears the weight of the counterweight 8 and then stops. At this point, the locking blocks of the counterweight 8 are removed, the lower fixing nut and the upper fixing nut of the counterweight 8 are loosened, and all operators leave the range of movement of the counterweight 8.

[0063] The remote-controlled light lifting crane 2 extends or shortens the wire rope 2-5, moves the counterweight 8 up or down, and after reaching the designated position in the crank 1, it is fixed.

[0064] This invention changes the current operation method of adjusting the crank balance block of a walking beam pumping unit, and can be used for various models of walking beam pumping units that use crank adjustment for balance.

[0065] This invention changes the current adjustment position and mode of the balance block 8 in the crank 1. Currently, the balance block 8 is adjusted horizontally or laterally on the crank 1 when the crank 1 is adjusted to a near-horizontal position. This invention, however, adjusts the pumping unit so that the crank 1 is in a longitudinal or vertically inclined direction. When the end of the crank 1 is adjusted to a near-horizontal position, a balance block hoisting mechanism and a crane fixing mechanism equipped with a light-duty crane 2 are installed at the shaft end and end of the crank 1, respectively.

[0066] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. An electric adjustment device for the balance block of a beam pumping unit, characterized in that, The balance weight hoisting mechanism and the crane fixing mechanism are respectively fixed at both ends of the crank. In the balance weight hoisting mechanism, the boom with pulleys on both sides is fixed in the crank groove at one end of the crank by boom positioning blocks and boom fixing bolts. The balance weight support plate with lifting rings on both sides is installed in the crank groove below the balance weight by anti-detachment pins. The light-duty crane is fixed in the crank groove at the other end of the crank by the crane fixing base in the crane fixing mechanism. In the light-duty crane, the output shaft of the motor is connected to the drum with a wire rope. The wire rope passes over the pulley and connects to the lifting rings on the balance weight support plate installed in the crank groove below the balance weight. The rotation direction of the motor is controlled by a remote control, so that the balance weight moves along the adjustment direction in the longitudinally inclined crank.

2. The electric adjustment device for the balance block of a beam pumping unit as described in claim 1, characterized in that, Both sides of the drum are provided with wire rope grooves, and wire ropes are installed in the wire rope grooves on both sides; the power cord of the motor can be connected to the 220V power terminal in the well site control cabinet or to a mobile power supply; the lifting weight of the motor is 2.5 tons to 3.5 tons.

3. The electric adjustment device for the balance block of a beam pumping unit as described in claim 2, characterized in that, The boom is a T-shaped block consisting of a crossbeam with an adjustment slot and a boom positioning block welded below. The boom positioning block also has positioning wing plates on both sides. The structure formed by the boom positioning block and the two side positioning wing plates is consistent with the groove structure of the crank groove. The boom positioning block also has threaded holes in the block and can be used to install boom fixing bolts.

4. The electric adjustment device for the balance block of a beam pumping unit as described in claim 3, characterized in that, The boom fixing bolt is provided with a rotating handle on the outside, and the width of the rotating handle is greater than the width of the crank groove.

5. The electric adjustment device for the balance block of a beam pumping unit as described in claim 3, characterized in that, The crossbeam of the boom rests against the end face of one end of the crank. The boom positioning block and the positioning wing plates on both sides are inserted into the crank groove at one end of the crank and the boom is fixed to one end of the crank by boom fixing bolts. The width of the crossbeam is 30cm-50cm larger than the width of the crank, and the length of the boom positioning block and the positioning wing plates is set between 30cm and 50cm.

6. The electric adjustment device for the balance block of a beam pumping unit as described in claim 3, characterized in that, Two tie rods with anti-slip caps and lifting rings welded to both ends can be installed in the adjustment slot of the crossarm. The outer diameter of the anti-slip caps is larger than the width of the adjustment slot. The two tie rods are located on both sides of the crank and can move in the adjustment slot of the crossarm.

7. The electric adjustment device for the balance block of a beam pumping unit as described in claim 6, characterized in that, Both lifting rings are connected to pulleys via hooks, and two wire ropes from the wire rope grooves pass over the two pulleys respectively.

8. The electric adjustment device for the balance block of a beam pumping unit as described in claim 7, characterized in that, The balance block support plate is provided with two lifting rings on both sides and a threaded hole in the middle of the plate body for inserting an anti-detachment pin; the outer diameter of the pin cap of the anti-detachment pin matches the width of the bottom of the crank groove, and the outer diameter of the pin of the anti-detachment pin is smaller than the width of the upper part of the crank groove; the two lifting rings are respectively connected to the hooks fixed at the lower ends of the two steel wire ropes that are wrapped around the two pulleys.

9. The electric adjustment device for the balance block of a beam pumping unit as described in claim 2, characterized in that, The front side of the crane mounting base is provided with a motor support plate, and the motor is fixed to the motor support plate by fixing bolts; the rear side of the crane mounting base is provided with a base positioning block, and base wing plates are respectively provided on both sides of the rear side of the base positioning block; the structure formed by the base positioning block and the base wing plates conforms to the groove structure of the crank groove and can be inserted into the crank groove; the upper and lower ends of the base positioning block are respectively provided with threaded holes, and upper fixing bolts and lower fixing bolts can be installed respectively; the upper fixing bolts and lower fixing bolts are provided with rotating handles on the outside, and the width of the rotating handles is greater than the groove width of the crank groove.

10. The electric adjustment device for the balance block of a beam pumping unit as described in claim 1, characterized in that, The balance block hoisting mechanism is installed at the crankshaft end, and the crane fixing mechanism that fixes the light-duty crane is installed on the front or back of the crank end.

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