Adjustable beam pumping unit crank balancing device

Abstract

The utility model discloses a kind of adjustable beam pumping unit crank balancing devices, including balancing block, two groups of balancing mechanism mainly consisting of lead screw, balancing block and linear guide rail are loaded in frame box, in each group of balancing mechanism: silk mother is fixedly connected with balancing block through silk mother mounting block and is connected with lead screw by screw thread;Linear guide rail with slider is fixed in the frame box of the upper and lower sides of balancing block and is fixedly connected with balancing block connecting plate through slider;The both ends of lead screw are connected with the bearing in the front bearing seat and rear bearing seat fixed in frame box respectively;Balancing block brake hoop is installed in the outer end of lead screw in each group of balancing mechanism. Use the device to replace the current beam pumping unit crank balancing block, ensure the personal safety of operator, reduce the labor intensity of operator, improve the working efficiency of crank balancing block position adjustment, reduce the operation well shut-in time, with remarkable use effect and application popularization value.

Description

Technical Field

[0001] This utility model relates to a counterweight device for a walking beam pumping unit in the petroleum industry, and more particularly to an adjustable walking beam pumping unit crank balancing device. Background Technology

[0002] The most commonly used oil production equipment in the petroleum industry is the beam pumping unit. Most beam pumping units use crank balance blocks to balance the power during the pumping process, preventing equipment failures such as motor burnout and gearbox gear damage caused by severe power imbalance. Because the properties of the produced fluid in the oil well are dynamically changing during pumping, especially in heavy oil wells during thermal recovery, the viscosity of the produced fluid changes significantly as the temperature decreases. This manifests as large fluctuations in the well load, altering the previously balanced operating state of the beam pumping unit and causing severe imbalance during the pumping stroke. This imbalance can severely damage the motor, gearbox gears, and other components.

[0003] The existing method of installing crank balance weights involves directly fixing them to the crank with bolts, and a locking anti-slip device is installed between the balance weights and the crank. If the position of the crank balance weights needs to be adjusted, it must be done as follows: Operate the crank of the pumping unit to a near-ground level position, remove the locking anti-slip device between the balance weights and the crank, and loosen the balance weight fixing bolts; two workers wearing safety harnesses stand on the side of the crank body and use a sledgehammer, pry bar, and manual shaking to shift the balance weights; finally, tighten the balance weight fixing bolts.

[0004] Throughout the operation, workers will inevitably stand on the narrow side of the crank body and operate the sledgehammer. This is a high-risk, direct operation at height, and workers are at risk of falling from heights, being struck by objects, or suffering mechanical injuries.

[0005] The current walking beam pumping unit has inconvenient crank balance adjustment and poses a safety hazard to operators working at heights, so it urgently needs improvement.

[0006] To address the aforementioned problems, the following related patent technology has emerged: Patent application CN201520816130.2, filed on October 22, 2015, discloses an adjustable balancing device, belonging to the field of oilfield machinery. This device solves the problem of difficult counterweight adjustment of the pumping unit crank by adding a counterweight to the tail of the existing walking beam pumping unit. The aforementioned utility model consists of an eccentric nut, a fixed sleeve, a lead screw, a locking nut, and a counterweight. The eccentric nut and the lead screw are connected by a trapezoidal thread. Two locking nuts are located on either side of the eccentric nut. The fixed sleeve is welded to the eccentric nut, and the counterweight is welded to the bottom of the lead screw. The inner cylindrical surface of the fixed sleeve has internal splines with 6-8 teeth. The length of the lead screw is one-sixth to one-fifth of the total length of the walking beam of the pumping unit.

[0007] The beneficial effects of the above-mentioned utility model are: because a counterweight is added to the tail of the beam pumping unit, the original crank counterweight is no longer used for balance adjustment. At the same time, due to the use of a trapezoidal threaded connection, the balance block can be freely adjusted, thus saving construction time and manpower and increasing the safety factor. However, its applicable scope is relatively narrow, only suitable for shallow oil wells with light loads, and it does not fundamentally solve the common problems in production sites such as inconvenient crank counterweight adjustment and the need for high-altitude operations in beam pumping units.

[0008] Application date 2021.9.30, patent application number CN202122404153.0 discloses a balance block adjustment device for a pumping unit. This invention relates to the field of walking beam pumping unit equipment, and includes an adjustment mechanism mounted on a crank. One side of the adjustment mechanism abuts against the balance block. The adjustment mechanism includes a mounting seat movably disposed on one side of the crank, with a mounting hole in the middle of the mounting seat, and a locking element movably disposed in the mounting hole. Two fixed seats are arranged parallel to each other on the upper surface of the mounting seat, each fixed seat having a threaded hole. The two threaded holes are coaxial, and a lead screw is threaded into the threaded hole. A push plate is rotatably disposed at one end of the lead screw, and the side of the push plate opposite to the lead screw abuts against one side of the balance block. The above-mentioned utility model allows the balance block of the walking beam pumping unit to be moved by manipulating the adjustment mechanism, reducing the labor intensity of workers and reducing the impact of balance adjustment on oil well production.

[0009] The invention described above has a positive effect on the displacement of the crank through the adjustment mechanism installed on the crank, avoiding the manual prying displacement mode. However, the high-altitude work caused by loosening and tightening the crank fixing bolts cannot be avoided. It does not fundamentally solve the problem of inconvenient adjustment of the crank balance block and the need for high-altitude work in the field of beam pumping units. Summary of the Invention

[0010] The purpose of this invention is to provide an adjustable crank balancing device for a beam pumping unit, which facilitates the adjustment of the balance weights without requiring work at heights, thus solving the problems of inconvenient adjustment and the need for work at heights in existing crank balance weight systems. This ensures the personal safety of operators, reduces their labor intensity, improves the efficiency of crank balance weight position adjustment, and reduces well downtime.

[0011] The technical solution of this utility model is: an adjustable walking beam pumping unit crank balancing device, including a balancing block, wherein: two sets of balancing mechanisms are installed in the frame box, mainly composed of a lead screw, a lead screw nut, a balancing block connecting plate, a balancing block, and a linear guide rail. In each balancing mechanism: the balancing block connecting plate is fixed on the upper and lower sides of the balancing block; the lead screw nut is fixedly connected to the balancing block through a lead screw nut mounting block and threadedly connected to the lead screw; the linear guide rail with a slider is fixed in the frame box on the upper and lower sides of the balancing block and is fixedly connected to the balancing block connecting plate through the slider; the two ends of the lead screw are respectively connected to bearings in the front bearing seat and the rear bearing seat fixed in the frame box; the balancing block brake clamp is installed on the outer end of the lead screw in each balancing mechanism; rotating the lead screw can adjust the position of the balancing block in the frame box; locking the balancing block brake clamp can fix the balancing block in the adjusted position in the frame box.

[0012] Preferably, each balancing block in the balancing mechanism consists of two mating block bodies. Each of the mating surfaces of the block bodies is provided with a connecting plate horizontal mounting platform, a connecting plate vertical mounting platform, a screw nut mounting block groove, and a screw rod semi-circular through hole on both the upper and lower sides. The screw nut mounting block groove is located at both ends of the balancing block. The screw rod semi-circular through hole is concentric with and communicates with the screw nut mounting block grooves at both ends. After the two balancing blocks are mated, they are connected by bolts, and the balancing block connecting plate and screw nut mounting block are fixed in the balancing block.

[0013] Preferably, the balance block connecting plates installed on the upper and lower sides of the balance block are T-shaped plates, and bolt holes are provided in both the horizontal and vertical plates of the T-shaped plates. The vertical plates of the two balance block connecting plates are installed facing each other on the upper and lower sides of the balance block.

[0014] Preferably, the horizontal plate in the balance block connecting plate installed on the upper and lower sides of the balance block can be installed into the connecting plate horizontal plate mounting platform after being aligned and can be connected to the slider by bolts; the vertical plate in the balance block connecting plate can be installed into the connecting plate vertical plate mounting platform and connected and fixed by bolts in the balance block.

[0015] Preferably, the nut that is threaded to the lead screw in each balancing mechanism is T-shaped and has an internal thread in the center hole that connects to the external thread of the lead screw; the outer circumference of the center hole of the large diameter outer circle of the upper part of the nut is provided with a bolt hole and can be connected to the nut mounting block by bolts.

[0016] Preferably, the nut mounting block is a square block provided with a central hole and capable of being installed and fixed in the nut mounting block groove in the balance block. One end of the nut mounting block is provided with a bolt hole and can be bolted to the upper large-diameter outer circle of the nut. The small-diameter rod body of the nut can be inserted into the central hole of the nut mounting block. Two nut mounting blocks equipped with nuts are installed in the nut mounting block groove, and the large-diameter ends of the two nuts are installed facing each other.

[0017] Preferably, the frame box is composed of two frame boxes with the same structure welded into a "曰" shape. Reinforcing vertical rods are welded to both sides of the frame box. Bearing seat mounting holes for inserting the front bearing seat and the rear bearing seat are provided in the box plates at both ends of the frame box. The linear guide rails are respectively installed on the upper and lower sides of each layer of the frame box. Fixed holes are provided in the bottom plates on the outer sides of both ends of the lower-layer frame box, and through these fixed holes, the crank balance device can be bolted to the balance block mounting groove of the pumping unit crank. The crank balance device is installed in the balance block mounting grooves of the cranks on both sides of the beam pumping unit.

[0018] Preferably, at least one set of balance block brake hoops is connected to the outer end of the screw rod in each set of the balance mechanisms.

[0019] Preferably, a wrench square capable of being connected to an electric torque wrench or a manual wrench is provided at the outer end of each screw rod.

[0020] Preferably, the linear guide rails installed in the frame box are sliding friction type linear guide rails.

[0021] Compared with the prior art, the utility model has the following remarkable use effects: The structure of the utility model is simple and ingeniously designed. Two sets of balance mechanisms with balance blocks are installed in the frame box. The balance blocks in the two sets of balance mechanisms are threadedly connected to the screw rods through nut mounting blocks and nuts. The position of the balance block in the frame box can be adjusted by the screw rod. After the position is set, the screw rod is fixed with the balance block brake hoop to prevent the screw rod from rotating, thereby fixing the position of the balance block.

[0022] Using the utility model to replace the crank balance block of the current beam pumping unit, the balance block can move following the rotation of the screw rod and its position in the frame box can be adjusted arbitrarily, which is very convenient to operate.

[0023] By operating the pumping unit to adjust its crank to a horizontal position or a vertical position close to the ground, the operator does not need to work at height. Standing on the ground or a low workbench, the operator rotates the screw rod with an electric torque wrench and adjusts the position of the balance block in the frame box arbitrarily according to the imbalance condition of the up and down strokes of the pumping unit. Then, the screw rod is locked with the balance block brake hoop to prevent the balance block from displacing, thus realizing the adjustment of the crank balance block of the pumping unit.

[0024] Replacing the existing crank balance block of the pumping unit with this utility model ensures the personal safety of operators, reduces the labor intensity of operators, improves the working efficiency of crank balance block position adjustment, and reduces downtime.

[0025] This invention completely solves all the defects and drawbacks of the current walking beam pumping unit, such as the inconvenience of adjusting the crank balance block and the need for working at height. It has significant practical effects and application promotion value. Attached Figure Description

[0026] 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 the front view of the structural schematic diagram of this utility model.

[0027] Figure 2 yes Figure 1 Top view.

[0028] Figure 3 yes Figure 1 The left view.

[0029] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure.

[0030] Figure 5 yes Figure 1 A schematic diagram of the structure of the balance block connecting plate.

[0031] Figure 6 yes Figure 1 A schematic diagram of the structure of the central balance block.

[0032] In the diagram: 1. Front bearing housing; 2. Lead screw; 3. Lead screw nut mounting block; 4. Lead screw nut; 5. Balance block connecting plate; 6. Slider; 7. Balance block; 7-1. Connecting plate horizontal mounting platform; 7-2. Connecting plate vertical mounting platform; 7-3. Lead screw nut mounting block groove; 7-4. Lead screw semi-circular through hole; 8. Linear guide rail; 9. Frame; 10. Rear bearing housing; 11. Balance block brake clamp. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] See Figures 1-6 An adjustable walking beam pumping unit crank balancing device includes a balancing block 7. The frame housing 9 contains two sets of balancing mechanisms, primarily composed of a lead screw 2, a lead screw nut 4, a balancing block connecting plate 5, a balancing block 7, and a linear guide rail 8. In each balancing mechanism: the balancing block connecting plate 5 is fixed to the upper and lower sides of the balancing block 7; the lead screw nut 4 is fixedly connected to the balancing block 7 via a lead screw nut mounting block 3 and threadedly connected to the lead screw 2; the linear guide rail 8, equipped with a slider 6, is fixed in the frame housing 9 on the upper and lower sides of the balancing block 7 and fixedly connected to the balancing block connecting plate 5 via the slider 6; both ends of the lead screw 2 are connected to bearings in the front bearing seat 1 and the rear bearing seat 10 fixed in the frame housing 9, respectively; a balancing block brake clamp 11 is installed on the outer end of the lead screw 2 in each balancing mechanism; rotating the lead screw 2 adjusts the position of the balancing block 7 in the frame housing 9; locking the balancing block brake clamp 11 fixes the balancing block 7 in the adjusted position in the frame housing 9.

[0037] This invention replaces the current balance blocks installed on the cranks of a beam pumping unit by installing the balance blocks 7 in the cranks on both sides of the unit. The balance blocks 7 in this device can move with the rotation of the lead screw 2 and their positions within the housing 9 can be freely adjusted. The pumping unit's cranks are adjusted to a near-ground horizontal or vertical position. The operator, standing on the ground or a low workbench, rotates the lead screw 2 using tools. Based on the imbalance during the pumping unit's up and down strokes, the balance blocks 7 in the two balancing mechanisms are moved to the corresponding balanced positions in the housing 9 via the lead screw 2. The lead screw 2 is then locked by the balance block brake clamp 11, preventing the balance blocks 7 from shifting, thus achieving the adjustment of the pumping unit's crank balance blocks.

[0038] After using this utility model, operators no longer need to use sledgehammers, pry bars, or manual shaking to displace the balance block 7 in the crank; operators no longer need to stand on the narrow side of the crank body to perform high-risk high-altitude operations, thus avoiding all the personal safety risks and defects caused by adjusting the balance block of the current beam pumping unit.

[0039] The balance block brake clamp 11 in this utility model is existing technology and can be manufactured with reference to the external brake clamp used in the oil pumping unit gearbox.

[0040] This invention completely solves the defects and drawbacks of current beam pumping units, such as inconvenient adjustment of the crank balance block and high-altitude operation, and has significant application effects and application promotion value.

[0041] Based on the above embodiment one, the present invention also has the following embodiments: In a preferred embodiment, each balancing block 7 in the balancing mechanism consists of two mating block-shaped bodies. Each block-shaped body has a connecting plate horizontal mounting platform 7-1, a connecting plate vertical mounting platform 7-2, a nut mounting block groove 7-3, and a lead screw semi-circular through hole 7-4 on both the upper and lower sides of its mating surface. The nut mounting block groove 7-3 is located at both ends of the balancing block 7. The lead screw semi-circular through hole 7-4 is concentric with and communicates with the nut mounting block grooves 7-3 at both ends. After the two balancing blocks 7 are mated, they are connected by bolts, and the balancing block connecting plate 5 and the nut mounting block 3 are fixed in the balancing block 7. Making the balancing block 7 into two mating block-shaped bodies is mainly to make it easier to insert the balancing block 7 from both sides of the frame box 9, facilitating installation and disassembly.

[0042] In a preferred embodiment, the balance block connecting plates 5 installed on the upper and lower sides of the balance block 7 are T-shaped plates, and bolt holes are provided in both the horizontal and vertical plates of the T-shaped plates. The vertical plates of the two balance block connecting plates 5 are installed facing each other on the upper and lower sides of the balance block 7.

[0043] In a preferred embodiment: the horizontal plate in the balance block connecting plate 5 installed on the upper and lower sides of the balance block 7 can be installed into the connected plate horizontal plate mounting platform 7-1 after being aligned and can be connected to the slider 6 by bolts; the vertical plate in the balance block connecting plate 5 can be installed into the connected plate vertical plate mounting platform 7-2 and connected and fixed by bolts in the balance block 7.

[0044] In a preferred embodiment, the nut 4, which is threadedly connected to the lead screw 2 in each balancing mechanism, is T-shaped and has an internal thread in its center hole that connects to the external thread of the lead screw 2; the nut 4 has a bolt hole on the outer periphery of the center hole of its upper large-diameter outer circle and can be bolted to the nut mounting block 3.

[0045] A preferred embodiment: see Figure 1, the nut mounting block 3 is a square block provided with a central hole and capable of being installed and fixed in the nut mounting block groove 7-3 in the balance block 7. One end of the nut mounting block 3 is provided with a bolt hole and can be bolted to the upper large-diameter outer circle of the nut 4; the small-diameter rod body of the nut 4 can be inserted into the central hole of the nut mounting block 3. Two nut mounting blocks 3 equipped with nuts 4 are installed in the nut mounting block groove 7-3, and the large-diameter ends of the two nuts 4 are installed facing each other.

[0046] A preferred embodiment: The frame box 9 is composed of two frame boxes with the same structure welded into a "曰" shape. Reinforcing vertical rods are welded to both sides of the frame box 9 to prevent the frame box 9 from deforming due to the self-weight of the balance block. Bearing seat mounting holes for inserting the front bearing seat 1 and the rear bearing seat 10 are provided in the box plates at both ends of the frame box 9. The linear guide rails 8 are respectively installed on the upper and lower sides of each layer of the frame box body; Fixed holes are provided in the bottom plates on the outer sides of both ends of the lower-layer frame box body, and through these fixed holes, the crank balance device can be bolted to the bolts in the balance block mounting groove of the pumping unit crank. The crank balance device is installed in the balance block mounting grooves of the cranks on both sides of the beam pumping unit. The frame box 9 in the present invention can also be made of two box bodies separately and then bolted or welded together. The use of the frame box body for the frame box 9 is convenient for the installation and disassembly of the components in the frame box 9, facilitating its maintenance and repair. On the other hand, it is also convenient to observe the moving position and distance of the balance block 7 and the working conditions of each component installed in the frame box 9.

[0047] A preferred embodiment: At least one set of balance block brake hoops 11 is connected to the outer end of the lead screw 2 in each set of the balance mechanism. In order to clearly show the structural features at both ends of the device in the drawings of the specification, only one set of the balance block brake hoops 11 shown in the figure is drawn. In order to make the use of the present invention stable, one set of balance block brake hoops 11 should be connected to the outer ends on both sides of the lead screw 2 in each set of the balance mechanism. Figure 1 and Figure 4 be able to clearly express the structural features at both ends of the device, only one set of the balance block brake hoops 11 shown in the figure is drawn. In order to make the use of the present invention stable, one set of balance block brake hoops 11 should be connected to the outer ends on both sides of the lead screw 2 in each set of the balance mechanism.

[0048] A preferred embodiment: A wrench square capable of being connected to an electric torque wrench or a manual wrench is provided at the outer end of each set of the lead screw 2. Using an electric torque wrench to connect to the lead screw 2 and rotate it can make the movement of the balance block 7 easier.

[0049] A preferred embodiment: The linear guide rail 8 installed in the frame box 9 is a sliding friction type linear guide rail. The linear guide rail 8 and the connected slider 6 in the present invention are prior art and can be purchased from the market or customized from the manufacturer.

[0050] 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 adjustable walking beam pumping unit crank balancing device, comprising a balance block, characterized in that, The box contains two sets of balance mechanisms mainly composed of a lead screw, a nut, a balance weight connecting plate, a balance weight, and linear guides. In each set of balance mechanisms: The upper and lower sides of the balance weight are fixed with balance weight connecting plates; the nut is fixedly connected to the balance weight through a nut mounting block and is threadedly connected to the lead screw; the linear guide provided with a slider is fixed in the box on the upper and lower sides of the balance weight and is fixedly connected to the balance weight connecting plate through the slider; both ends of the lead screw are respectively connected to the bearings in the front bearing block and the rear bearing block fixed in the box; the balance weight brake hoop is installed at the outer end of the lead screw in each set of balance mechanisms; rotating the lead screw can adjust the position of the balance weight in the box; locking the balance weight brake hoop can fix the balance weight at the set position in the box.

2. The adjustable walking beam pumping unit crank balancing device as described in claim 1, characterized in that, The balance weight in each set of balance mechanisms is composed of two mating block bodies. On the upper and lower sides of the mating surface of each block body, there are connecting plate horizontal plate mounting platforms, connecting plate vertical plate mounting platforms, nut mounting block grooves, and lead screw semi-circular through holes. The nut mounting block grooves are arranged at both ends of the balance weight. The lead screw semi-circular through holes are concentric with and penetrate through the nut mounting block grooves at both ends. After the two block bodies of the balance weight are mated, they are connected by bolts and the balance weight connecting plate and the nut mounting block are fixed in the balance weight.

3. The adjustable walking beam pumping unit crank balancing device as described in claim 2, characterized in that, The balance weight connecting plates installed on the upper and lower sides of the balance weight are T-shaped plates and bolt holes are provided in both the horizontal plate and the vertical plate of the T-shaped plate. The vertical plates in the two balance weight connecting plates are installed facing each other on the upper and lower sides of the balance weight.

4. The adjustable walking beam pumping unit crank balancing device as described in claim 3, characterized in that, The horizontal plate in the balance weight connecting plates installed on the upper and lower sides of the balance weight can be inserted into the connecting plate horizontal plate mounting platform after mating and can be bolted to the slider; the vertical plate in the balance weight connecting plate can be inserted into the connecting plate vertical plate mounting platform and is connected and fixed by the bolts in the balance weight.

5. The adjustable walking beam pumping unit crank balancing device as described in claim 2, characterized in that, The appearance of the nut threadedly connected to the lead screw in each set of balance mechanisms is T-shaped and the central hole is provided with an internal thread connected to the external thread of the lead screw; bolt holes are provided on the outer periphery of the central hole of the large-diameter outer circle of the upper part of the nut and it can be bolted to the nut mounting block.

6. The adjustable walking beam pumping unit crank balancing device as described in claim 5, characterized in that, The nut mounting block is a square block body provided with a central hole and can be installed and fixed in the nut mounting block groove in the balance weight. One end of the nut mounting block is provided with a bolt hole and can be bolted to the large-diameter outer circle of the upper part of the nut; the small-diameter rod body of the nut can be inserted into the central hole of the nut mounting block. Two nut mounting blocks with nuts installed are installed in the nut mounting block grooves and the large-diameter ends of the two nuts are installed facing each other.

7. The adjustable walking beam pumping unit crank balancing device as described in claim 1, characterized in that, The box is composed of two frame boxes with the same structure and welded into a "曰" shape. Reinforcing vertical rods are welded on both sides of the box. Bearing seat mounting holes for inserting the front bearing block and the rear bearing block are provided in the box plates at both ends of the box. The linear guides are respectively installed on the upper and lower sides of each layer of the frame box; fixing holes are provided in the bottom plates on the outer sides of both ends of the lower layer of the frame box and through these fixing holes, the crank balance device can be bolted to the balance weight mounting groove of the pumping unit crank. The crank balance device is installed in the balance weight mounting grooves of the cranks on both sides of the beam pumping unit.

8. The adjustable walking beam pumping unit crank balancing device as described in claim 5, characterized in that, At least one set of balance weight brake hoops is connected to the outer end of the lead screw in each set of balance mechanisms.

9. The adjustable walking beam pumping unit crank balancing device as described in claim 8, characterized in that, Each set of lead screws has a wrench end that can be connected to an electric torque wrench or a manual wrench.

10. The adjustable walking beam pumping unit crank balancing device as described in claim 7, characterized in that, The linear guide rail installed in the frame is a sliding friction type linear guide rail.

Images