A belt type pumping unit balance iron taking and replacing device

Abstract

This invention relates to a device for replacing the balance weight of a belt-driven oil pumping unit. The device comprises an upper gripper, a lower gripper, and a clamping lever. The lower gripper is fixed to the front side of a fixed plate. The upper and lower grippers are connected to a connecting plate via pins one and two, and a roller is mounted behind pin one, which is installed on the rear side of the upper gripper. The rear end of the connecting cylinder is a push-pull stroke cylinder, which is fixed to a push rod base and a positioning plate. The push rod is installed in the connecting cylinder and the push-pull stroke cylinder, with a front push block fixed to its front end and a rear push block fixed to its rear end. Rear spring fixing bolts on both sides of the push-pull stroke cylinder are connected to the rear of the push rod. The front push block rests against the rear of the roller. A force-applying rod is mounted on the upper end of the clamping lever, and its lower end rests against the rear of the rear push block. The front end of the handle is fixed to the rear side of the positioning plate, and the force-applying rod is engaged in the positioning plate. This invention effectively solves the problems existing in the balance adjustment of belt-driven oil pumping units and improves work efficiency.

Description

Technical Field

[0001] This invention relates to balancing tools for belt-driven pumping units in the field of oil and gas extraction, and in particular to a device for replacing the balance iron of a belt-driven pumping unit. Background Technology

[0002] Currently, pumping units are the most important oil production equipment in oil fields. During the oil production process, the load on the upper and lower strokes of the pumping unit is very different, resulting in an unequal amount of work done by the motor, which is called imbalance.

[0003] Imbalanced operation of the pumping unit can lead to uneven motor load, resulting in wasted power, reduced oil production efficiency, and shortened motor life. It can also cause pumping unit vibration, making it prone to malfunctions and affecting the lifespan of the pumping unit. Furthermore, unbalanced operation of the pumping unit can also affect the normal operation of the sucker rod and the pump.

[0004] To ensure the normal operation of the entire oil well pumping system, balancing the pumping unit has become a frequent task required for its normal operation.

[0005] The balancing of belt-driven pumping units, the second largest type of equipment in oilfields, is achieved by adjusting the number of counterweights in the counterweight box. Currently, the adjustment of the counterweight of belt-driven pumping units is generally done manually. Due to the structural characteristics of the counterweight box, its opening is narrow, and after the counterweights are installed, the space available for operation around the inner cavity of the box is also very limited. The counterweights themselves are quite heavy, with a single piece weighing nearly 20 kg. The seamless stacking of multiple counterweight pieces makes manual addition and removal of counterweights difficult, resulting in high labor intensity and low work efficiency for workers. Furthermore, since removing or placing counterweights requires standing at a height, there are safety risks associated with working at height and the possibility of hands being pinched or injured during manual handling. Moreover, adjusting the counterweight of a belt-driven pumping unit typically requires 2-3 people working together.

[0006] To address the issue of balancing belt-driven oil pumping units, a search revealed the following relevant patent documents:

[0007] 1. Automatic load balancing adjustment device for belt-driven oil pumping units, patent application number 202110949240.6

[0008] This invention discloses an automatic load balancing adjustment device for belt-driven oil pumping units, comprising a counterweight box, an electromagnetic adjustment mechanism, a mechanical locking mechanism, a limiting component, multiple adjustable counterweights, and a signal receiver. The top of the counterweight box is movably mounted to the bottom of the electromagnetic adjustment mechanism. This automatic balancing device redesigns the counterweight box and adjustable counterweights, enabling remote control of the number of adjustable counterweights by receiving instructions from the production command center via the signal receiver and utilizing the combined action of the electromagnetic adjustment mechanism and the mechanical locking mechanism. This achieves a balanced state for the oil pumping unit, completely changing the original method of adjusting the balance of belt-driven oil pumping units from manual adjustment to automatic adjustment based on load power. The balance rate of the oil pumping unit can reach the required balance at any time, effectively improving the efficiency of the oil pumping unit system, significantly reducing the labor intensity of workers, reducing labor requirements, and lowering labor costs.

[0009] The above-mentioned device is an automatic balancing adjustment device for belt-driven oil pumping units. It redesigns the counterweight box and adjustable counterweight blocks, changing the structure of the existing belt-driven oil pumping units. These changes need to be made by the belt conveyor manufacturer. It cannot be used for belt-driven oil pumping units that are already widely used in production sites. At the same time, it cannot realize the operation of removing and placing counterweight blocks during the balancing process of existing oil pumping units.

[0010] 2. Balance block adjustment device, patent application number 201210341888.6

[0011] This invention discloses a balance block adjustment device for use in drilling and production equipment, which can improve the reliability of balance block adjustment. The balance block adjustment device includes a walking beam and a balance block assembly movably fitted onto the walking beam. Seats are located on the front and rear sides of the balance block assembly on the walking beam, and set screws are provided on the seats to push the balance block assembly on the walking beam. During operation, the movement of the balance block assembly is achieved by rotating the set screws. Thus, it is unnecessary to drill through holes through the lead screw within the balance block assembly. Furthermore, the length of the set screws can be significantly shortened compared to lead screws in the prior art. With the shortened length, their diameter can also be significantly reduced, while still ensuring the working strength of the set screws. This also facilitates the manufacturing of the set screws, making it particularly suitable for widespread application in walking beam balance block adjustment devices in drilling and production equipment.

[0012] The above-mentioned device is suitable for balancing beam pumping units. It does not allow for the removal of balance blocks from belt-driven pumping units at the oilfield. ， It cannot be used for balancing belt-driven oil pumps.

[0013] 3. Robotic arm, patent application number 201110135393.3

[0014] This invention discloses a robotic arm, comprising a base, a torsion platform fixed on the base, and a torsion table rotatably mounted on the torsion platform; a cantilever arm fixed to one side of the torsion table, with a guide rail for a slider to slide on the cantilever arm, and a gripper frame fixing plate on the slider; a cylinder frame mounted on the cantilever arm and the torsion table, with a second cylinder mounted on the cylinder frame; a fixing frame fixed to one side of the gripper frame fixing plate, with a third cylinder fixed on the fixing frame; a gripper fixing plate connected to the piston rod of the third cylinder, with a gripper fixed to the lower end of the gripper fixing plate; the torsion table is rotatably connected to a push block at the head of the piston rod of the first cylinder via a rotating platform fixing block; the first cylinder is fixed to the base plate. This invention has the advantage of directly releasing products onto a product storage platform without creating a height difference between the grasped product and the storage platform, thus preventing damage to the product during release due to height differences.

[0015] The aforementioned patented technology is a common robotic arm. Due to the stacked placement of counterweights on the belt conveyor and the characteristics of the counterweight box, this type of robotic arm cannot perform the operation of retrieving counterweights from the counterweight box of the belt-driven pumping unit at the oilfield. Summary of the Invention

[0016] The purpose of this invention is to address the problem of high labor intensity, low efficiency, and safety hazards associated with manually adding or removing balance weights during the adjustment of the counterweights in belt-driven oil pumping units. This invention provides a device for replacing balance weights in belt-driven oil pumping units. It assists in adjusting the counterweights of belt-driven oil pumping units, reduces the labor intensity of workers, improves the efficiency of balancing belt-driven oil pumping units, avoids hand pinching and injury accidents that easily occur during the replacement of balance weights, and ensures production safety.

[0017] The technical solution of this invention is as follows: A device for replacing the balance iron of a belt-driven oil pumping unit includes an upper gripper, a lower gripper, a push rod, a connecting cylinder, a clamping lever, a force-applying rod, and a handle. The lower gripper is fixed to the front side of a fixed plate. The upper gripper and lower gripper are connected to the connecting plate via pin one and pin two, and a roller is mounted behind pin one, which is installed on the rear side of the upper gripper. Return springs are installed at the front spring fixing bolts on both sides of the fixed plate and at both ends of the roller. The connecting cylinder is fixed to the rear side of the fixed plate and has a lifting frame at its rear. The rear end of the connecting cylinder is a push-pull stroke cylinder, which... The push rod is fixed together with the push rod base and the positioning plate; the push rod is installed in the connecting cylinder and the push-pull stroke cylinder, with the front push block fixed at the front end and the rear push block fixed at the rear end. The rear spring fixing bolts on both sides of the push-pull stroke cylinder are connected to the rear of the push rod, and the front push block rests against the rear of the roller shaft; a return spring is installed between the rear spring fixing bolt and the rear spring fixing bolts on both sides of the push rod base; a clamping lever is installed in the push rod base, with a force-adding rod installed at the upper end of the clamping lever and the lower end resting against the rear of the rear push block; the front end of the handle is fixed to the rear side of the positioning plate, and the force-adding rod is stuck in the positioning plate.

[0018] Preferably, both the upper gripper and the lower gripper are provided with a weight reduction groove and a pin mounting groove in their bodies, and the front ends of the upper gripper and the lower gripper are respectively provided with opposite inclined surfaces. A roller and a pin are respectively installed in the pin mounting groove at the rear of the upper gripper and the lower gripper.

[0019] Preferably, a torsion spring pry block is fixed to the front end of the lower gripper. The outer connecting line of the longitudinal section of the torsion spring pry block body is an acute triangle and one end is provided with a pry block shaft hole. The torsion spring pry block is installed in the weight reduction groove at the front end of the lower gripper through the pry block shaft hole and the pry block pin, and the two ends of the pry block pin are respectively connected to the two ends of the torsion spring pry block. The base of the acute triangle of the torsion spring pry block is flush with the upper end face of the lower gripper and the acute angle faces the front end of the lower gripper.

[0020] Preferably, the opposing end faces of the upper and lower grippers that contact the balance iron are machined with locking teeth. The first pin installed in the pin mounting groove at the rear of the upper gripper and the connecting plate form a parallelogram structure on both sides of the upper and lower grippers. The opposing end faces of the upper and lower grippers that contact the balance iron are machined with locking teeth. The two first pins and two second pins installed in the pin mounting groove at the rear of the upper gripper form a parallelogram structure on both sides of the upper and lower grippers through the connecting plate, thus completing the connection between the upper and lower grippers.

[0021] Preferably, the lower rear side of the front push block is fixedly connected to the push rod passing through the fixed plate, for example by welding or screws. The longitudinal section of the front body of the front push block has a forward-extending arc structure, and the angle of the arc structure is tangent to the arc of the roller.

[0022] Preferably, the outer diameter of the connecting cylinder is larger than the outer diameter of the push-pull stroke cylinder, and the rear outer wall of the connecting cylinder is provided with a lifting frame limiting platform and the front part of the outer wall connected to the push-pull stroke cylinder is provided with an external thread that can be connected to the lifting frame limiting nut; a lifting frame is installed between the lifting frame limiting platform and the lifting frame limiting nut, and the lifting frame limiting nut is a round nut with a fastening groove or wrench square on the outer wall.

[0023] Preferably, the fixed plate, connecting cylinder, and push-pull stroke cylinder are clearance-fitted with the push rod; the push-pull stroke cylinder has push rod stroke grooves on both sides of its body, and the rear spring fixing bolt is inserted into the push rod stroke groove and connected to the push rod; the length of the push rod stroke groove matches the forward distance of the upper gripper; the height of the fixed plate is greater than the height of the roller shaft installed in the upper gripper, and the front spring fixing bolt is installed on both sides of the upper end of the fixed plate.

[0024] Preferably, the hoisting frame is provided with a connecting end plate, a front support plate and a rear support plate. The front support plate and the rear support plate are L-shaped plates with mounting holes in them. The front support plate and the rear support plate are sleeved on the outside of the connecting cylinder through the mounting holes. The connecting end plate is fixed together with the short plate in the L-shaped plate of the front support plate and the rear support plate.

[0025] Preferably, a hoisting equipment connecting column is provided at the non-fixed ends of the connecting end plate and the front support plate and the rear support plate.

[0026] Preferably, the push rod base is a U-shaped base, and a clamping lever is installed in the U-shaped groove of the push rod base by means of a shaft pin. The lower two sides of the body of the push rod base are equipped with rear spring fixing bolts two, which are installed parallel to the rear spring fixing bolt one.

[0027] Preferably, the lower part of the clamping lever is an arc-shaped rod, the middle part of the rod is connected to a pin installed in the push rod base, and the upper part of the rod is connected to a force-applying rod. The lower end of the clamping lever abuts against the rear side of the push block fixed to the rear end of the push rod.

[0028] Preferably, the positioning plate is a U-shaped plate, with a push rod base fixed at the front end and a reinforcing plate fixed at the rear end. The groove of the U-shaped groove on the upper part of the positioning plate corresponds to the groove of the U-shaped groove in the push rod base. The front end of the handle is fixed together with the reinforcing plate on the rear side of the positioning plate.

[0029] Preferably, the force-applying rod is a Z-shaped rod, the front end of which is threadedly connected to the clamping lever, and the rod body connected to the clamping lever is engaged in the U-shaped groove of the positioning plate.

[0030] The significant advantages of this invention are as follows: It effectively solves the problems existing in the current balancing adjustment of belt-driven pumping units, improves the safety of balance weight adjustment, reduces the labor intensity of workers, and increases work efficiency. After adopting the device of this invention, the efficiency of balance weight handling can be increased by 50% or more. Specifically: 1. This invention can complete the handling of balance weights in belt-driven pumping units even in confined spaces within the counterweight box, thereby reducing the labor intensity of workers and achieving the adjustment of the pumping unit's balance weight; 2. This invention can replace the traditional manual handling of balance weights, effectively preventing accidents such as hand pinching during manual handling; 3. This invention reduces the labor intensity of operators while reducing the number of personnel involved in the operation, improving work efficiency and achieving safe production; 4. This invention has a simple structure, reasonable design, reliable working principle, and significant practical effects. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0032] In the attached diagram: Figure 1 This is a front view of the schematic diagram of the device structure of the present invention.

[0033] Figure 2 yes Figure 1 Top view.

[0034] Figure 3 yes Figure 1 A schematic diagram of the structure of the torsion spring skid.

[0035] Figure 4 This is a schematic diagram of the working state of the device of the present invention.

[0036] In the diagram: 1. Upper gripper; 2. Pin 1; 3. Connecting plate; 4. Roller; 5. Front push block; 6. Push rod; 7. Front spring fixing bolt; 8. Fixing plate; 9. Connecting end plate; 10. Front support plate; 11. Rear support plate; 12. Connecting cylinder; 13. Push-pull stroke cylinder; 14. Clamping lever; 15. Push rod base; 16. Force rod; 17. Handle; 18. Positioning plate; 21. Rear spring fixing bolt 1; 19. Rear push block; 20. Lifting frame limit nut; 22. Lower gripper; 23. Pin 2; 24. Torsion spring pry bar; 25. Pry bar pin; 26. Detailed Implementation

[0037] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this invention. The technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 and not intended to limit the invention.

[0039] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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 the invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] See Figure 1 - Figure 4 A device for replacing the balance iron of a belt-driven oil pumping unit includes an upper gripper 1, a lower gripper 23, a push rod 6, a connecting cylinder 12, a clamping lever 14, a force-applying rod 16, and a handle 17. The lower gripper 23 is fixed to the front side of a fixed plate 8. The upper gripper 1 and the lower gripper 23 are connected to a connecting plate 3 via pin 1 2 and pin 2 24. A roller 4 is installed behind pin 1 2, which is mounted on the rear side of the upper gripper 1. Return springs are installed at the front spring fixing bolts 7 on both sides of the fixed plate 8 and at both ends of the roller 4. The connecting cylinder 12 is fixed to the rear side of the fixed plate 8 and has a lifting frame at its rear. The rear end of the connecting cylinder 12 is a push-pull stroke cylinder 13, which is connected to the push rod base 15 via the push-pull stroke cylinder 13. The positioning plate 18 is fixed together; the push rod 6 is installed in the connecting cylinder 12 and the push-pull stroke cylinder 13, with the front push block 5 fixed at the front end and the rear push block 20 fixed at the rear end. The rear spring fixing bolts 1-21 on both sides of the push-pull stroke cylinder 13 are connected to the rear of the push rod 6. The front push block 5 abuts against the rear of the roller shaft 4. A reset spring is installed between the rear spring fixing bolts 1-21 and the rear spring fixing bolts 2-19 installed on both sides of the push rod base 15. The push rod base 15 is equipped with a clamping lever 14. The upper end of the clamping lever 14 is equipped with a force-adding rod 16, and the lower end abuts against the rear of the rear push block 20. The front end of the handle 17 is fixed to the rear side of the positioning plate 18, and the force-adding rod 16 is locked in the positioning plate 18.

[0041] To facilitate the gripping of the counterweight in the counterweight box of a belt-driven oil pumping unit, this invention includes an upper gripper 1 and a lower gripper 23. The lower gripper 23 is fixed to the front side of the fixing plate 8. The upper gripper 1 and the lower gripper 23 are connected to the connecting plate 3 via pin 1 2 and pin 24. A roller 4 is mounted behind pin 1 2, which is installed on the rear side of the upper gripper 1. The upper gripper 1 and the lower gripper 23 are movably connected. A front push block 5 and a rear push block 20 are fixed to the front and rear ends of the push rod 6, respectively. The front push block 5 rests against the rear of the roller 4, and the lower end of the clamping lever 14 rests against the rear of the rear push block 20.

[0042] By pulling the clamping lever 14 with the force lever 16, the rear push block 20 and push rod 6 are pushed forward. The front push block 5 pushes the roller shaft 4 and pin shaft 2 to move, so that the upper gripper 1 moves forward and clamps with the lower gripper 23, grabbing the balance iron in the pumping unit counterweight box.

[0043] The return springs installed on both sides of the outside of the push-pull stroke cylinder 13 between the rear spring fixing bolt 121 and the rear spring fixing bolt 29, and the return springs installed on both sides of the fixed plate 8 between the front spring fixing bolt 7 and the roller shaft 4, play a role in smoothly moving the push rod 6 forward. When the replacement balance iron is loosened and removed, the above-mentioned return springs can quickly reset the push rod 6 and the upper gripper 1.

[0044] Using this invention can significantly reduce the labor intensity of workers, make the work of balancing the oil pumping unit easier and more pleasant, and avoid unsafe factors such as pinching hands, thus having remarkable effects.

[0045] The upper gripper 1 and the lower gripper 23 are both provided with weight reduction grooves and pin mounting grooves. The front ends of the upper gripper 1 and the lower gripper 23 are respectively provided with opposite inclined surfaces. The roller shaft 4 and the pin shaft 2 are respectively installed in the pin mounting grooves at the rear of the upper gripper 1 and the lower gripper 23.

[0046] The lower gripper 23 is also fixed to a torsion spring pry bar 25. The outer connecting line of the longitudinal section of the torsion spring pry bar 25 is an acute triangle, and one end is provided with a pry bar shaft hole. The torsion spring pry bar 25 is installed in the weight reduction groove at the front end of the lower gripper 23 through the pry bar shaft hole and the pry bar pin 26, and the two ends of the pry bar pin 26 are respectively connected to the two ends of the torsion spring pry bar 25. The base of the acute triangle of the torsion spring pry bar 25 is flush with the upper end face of the lower gripper 23, and the acute angle faces the front end of the lower gripper 23. The weight reduction groove is provided in the upper gripper 1 and the lower gripper 23 to reduce the weight of the entire device and to install the required components. Installing the torsion spring pry bar 25 facilitates the clamping of the balance iron in the counterweight box, because before the balance iron is removed, the multiple layers of balance iron in the counterweight box are stacked together, generally in a seamless state. When clamping, the upper layer of balance iron should first be separated from the lower layer of balance iron. The torsion spring pry bar 25 can be used to pry open the balance iron, creating a gap between the upper and lower balance irons. This allows the lower gripper 23 to reach into the gap and clamp the upper balance iron when the upper gripper 1 moves. Simultaneously, the installed torsion spring allows the torsion spring pry bar 25 to rotate around its pry bar pin 26, thus preventing it from obstructing the balance iron when the lower gripper 23 reaches in. After the balance iron is removed and lowered, the torsion spring pry bar 25 can be reset by the action of the return torsion spring, facilitating the clamping of the balance iron again.

[0047] Both the upper gripper 1 and the lower gripper 23 have cleats machined on their opposing end faces that contact the balance weight. The pin 2, installed in the pin mounting groove at the rear of the upper gripper 1, and the connecting plate 3 form a parallelogram structure on both sides of the upper gripper 1 and the lower gripper 23. The two pins 2 respectively form parallelogram structures with the connecting plates 3 on both sides, completing the connection between the upper gripper 1 and the lower gripper 23. The cleats machined on the opposing end faces of the upper gripper 1 and the lower gripper 23 that contact the balance weight increase the clamping force when holding the balance weight, making its operation more reliable. The parallelogram structure of the connecting plate 3 and the upper gripper 1 and lower gripper 23 ensures that their two opposing inner surfaces remain parallel during movement, resulting in a uniform and reliable clamping force.

[0048] The lower rear side of the front push block 5 is fixedly connected to the push rod 6 passing through the fixed plate 8, for example, by welding or screws. The longitudinal section of the front body of the front push block 5 has a forward-extending arc structure, and the angle of this arc structure is tangent to the arc of the roller 4. The front push block 5 pushes the roller 4 forward, which in turn pushes the pin 2 of the upper gripper 1, causing the upper gripper 1 to move forward and downward.

[0049] The outer diameter of the connecting cylinder 12 is larger than the outer diameter of the push-pull stroke cylinder 13. The rear outer wall of the connecting cylinder 12 is provided with a lifting frame limiting platform, and the front part of the outer wall that connects with the push-pull stroke cylinder 13 is provided with an external thread that can be connected to the lifting frame limiting nut 22. A lifting frame is installed between the lifting frame limiting platform and the lifting frame limiting nut 22. The lifting frame limiting nut 22 is a round nut with a fastening groove or wrench square on its outer wall. The lifting frame limiting nut 22 can be tightened with a hook wrench or an open-end wrench. The lifting frame can be fixed to the outer wall of the connecting cylinder 12 by the lifting frame limiting nut 22 and the lifting frame limiting platform.

[0050] The fixed plate 8, connecting cylinder 12, and push-pull stroke cylinder 13 are fitted with the push rod 6 with clearance; the push-pull stroke cylinder 13 has push rod stroke grooves on both sides of its body, and the rear spring fixing bolt 21 is inserted into the push rod stroke groove and connected to the push rod 6; the length of the push rod stroke groove is consistent with the forward distance of the upper gripper 1; the height of the fixed plate 8 is greater than the height of the roller 4 installed in the upper gripper 1, and the front spring fixing bolt 7 is installed on both sides of the upper end of the fixed plate 8.

[0051] The hoisting frame is provided with a connecting end plate 9, a front support plate 10 and a rear support plate 11. The front support plate 10 and the rear support plate 11 are L-shaped plates with mounting holes. The front support plate 10 and the rear support plate 11 are sleeved on the outside of the connecting cylinder 12 through the mounting holes. The connecting end plate 9 is fixed together with the short plate in the L-shaped plate of the front support plate 10 and the rear support plate 11.

[0052] A hoisting equipment connecting column is also provided at the non-fixed ends of the connecting end plate 9 and the front support plate 10 and the rear support plate 11. This allows for smooth rotation during the removal of the balance iron. Through the hoisting equipment connecting column, this device can be connected to hoisting components such as the hoisting chain or hook of the hoisting equipment, eliminating the need for workers to manually handle the device to clamp the balance iron, thus reducing the labor intensity of workers.

[0053] The push rod base 15 is a U-shaped seat. A clamping lever 14 is installed in the U-shaped groove of the push rod base 15 via a pin. Rear spring fixing bolts 2 and 19 are installed in the lower two sides of the body of the push rod base 15. These rear spring fixing bolts 2 and 19 are installed parallel to rear spring fixing bolts 1 and 21. After installing a return spring between the rear spring fixing bolts 2 and 19 and 21, it can be ensured that the push rod 6 moves forward smoothly and returns to its original position quickly and easily.

[0054] The lower part of the clamping lever 14 is an arc-shaped rod, the middle part of the rod is connected to a pin installed in the push rod base 15, and the upper part of the rod is connected to the force-applying rod 16. The lower end of the clamping lever 14 abuts against the rear side of the push block 20 fixed to the rear end of the push rod 6. The lower part of the clamping lever 14 is an arc-shaped rod, which can amplify the applied force in two stages to ensure reliable clamping force and ensure that the friction force generated by the clamping force of the upper gripper 1 and the lower gripper 23 can be balanced with the weight of the balance iron when the balance iron is upright.

[0055] The positioning plate 18 is a U-shaped plate. The front end of the positioning plate 18 is fixed to the push rod base 15, and the rear end is fixed to the reinforcing plate. The groove of the U-shaped groove on the upper part of the positioning plate 18 corresponds to the groove of the U-shaped groove in the push rod base 15. The front end of the handle 17 is fixed to the reinforcing plate on the rear side of the positioning plate 18. After the upper gripper 1 and the lower gripper 23 clamp the balance iron, the handle 17 can be rotated to make the lower gripper 23 and the upper gripper 1, which are connected in sequence with the reinforcing plate, the positioning plate 18, the push rod base 15, the push-pull stroke cylinder 13, the connecting cylinder 12 and the fixing plate 8, and the balance iron rotate together by 90°. This allows the balance iron to be taken out from the counterweight port of the counterweight box in a side-standing position after being clamped. The operation process of putting in the balance iron is the reverse.

[0056] The force-applying rod 16 is a Z-shaped rod. The front end of the Z-shaped rod is threadedly connected to the clamping lever 14, and the rod body connected to the clamping lever 14 is locked in the U-shaped groove of the positioning plate 18. When the rod body of the force-applying rod 16 is rotated and aligned with the U-shaped groove of the positioning plate 18, downward force is applied with the bottom of the U-shaped groove of the positioning plate 18 as the fulcrum. This pushes the push rod 6 forward through the rear push block 20 to perform the clamping operation of the balance iron.

[0057] The following describes the method of using this invention based on the balancing process of the oil pumping unit in the production site.

[0058] See Figure 1 - Figure 4 If the belt-driven pumping unit is overweight, adjust the balance of the pumping unit and remove the balance iron from the counterweight box. The procedure is as follows: 1. Hoist the present invention near the counterweight port of the pumping unit's counterweight box using a hoisting device, so that the upper handle 1 and lower handle 23 of the device face the counterweight port of the pumping unit's counterweight box; 2. At this time, the upper handle 1 is in the loose state. Hold the handle 17 and push the device forward so that the upper handle 1 and lower handle 23 are close to the uppermost balance iron. Since the torsion spring pry bar 25 is currently pressed against the front side of the balance iron, it flips under the action of the forward thrust. Under the friction of the lower balance iron and the support of the rear wall of the counterweight box, the torsion spring pry bar 25 generates an upward component force at the contact point with the balance iron, causing a gap to separate the balance iron from the lower balance iron at that point. 3. Continue pushing the handle 17 forward, and the lower gripper 23 extends under the balance iron. Under the action of the torsion spring, the torsion spring pry bar 25 will flip over and overlap with the upper end face of the lower gripper 23, which will not hinder the lower gripper 23 from continuing to extend until the connecting plate 3 contacts the balance iron, and the connecting plate 3 acts as a limit. 4. Pull the lever 16 backward so that its body is inserted into the U-shaped groove of the positioning plate 18 and the lever 16 is rotated 90° and locked by the positioning plate 18. In this process, the lever 16 further increases the force through the clamping lever 14 during the pulling process, and the pusher 20 moves forward. Since the rear push block 20 is connected to the push rod 6 as one unit, the front push block 5 connected to the front of the rear push block 6 presses down on the roller shaft 4 and moves it forward, thereby pushing the parallelogram structure composed of the upper gripper 1, the lower gripper 23 and the two connecting plates 3 to move. Therefore, as the roller shaft 4 moves forward, the connecting plate 3 rotates, causing the upper gripper 1 to move downward. During the movement, the lower end face of the upper gripper 1 and the upper end face of the lower gripper 23 remain parallel. As the force lever 16 is locked in place, the upper gripper 1 and the lower gripper 23 clamp the balance iron. 5. After lifting the handle 17 to lift the clamped balance iron, grasp the handle 17 and rotate it 90°. At this time, the balance iron is in a side-standing state. Then, pull the handle 17 to remove the balance iron from the counterweight box. Since the structural dimensions of the upper gripper 1 and the lower gripper 23 in this invention are smaller than the dimensions of the counterweight opening in the counterweight box, it can ensure that the balance iron can be taken out smoothly; 6. Rotate the force rod 16 in the opposite direction by 90° and lift it up. At this time, under the pulling action of the two reset springs at the front and rear of this device, the upper gripper 1 and the lower gripper 23 separate and release the balance iron.

[0059] If the belt-driven pumping unit is too unbalanced, adjust the balance by placing the counterweight into the counterweight box. The process of placing the counterweight into the counterweight box is similar to the process of removing the counterweight; simply follow the steps described above for removing the counterweight from the counterweight box.

[0060] 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. A device for replacing the balance iron in a belt-driven oil pumping unit, characterized in that, The device is equipped with an upper gripper (1), a lower gripper (23), a push rod (6), a connecting cylinder (12), a clamping lever (14), a force-applying rod (16), and a handle (17). The lower gripper (23) is fixed to the front side of the fixed plate (8). The upper gripper (1) and the lower gripper (23) are connected to the connecting plate (3) by a first pin (2) and a second pin (24). A roller (4) is installed behind the first pin (2) installed on the rear side of the upper gripper (1). Front springs are fixed on both sides of the fixed plate (8). Return springs are installed at both ends of the bolt (7) and the roller (4); the connecting cylinder (12) is fixed to the rear side of the fixing plate (8) and a lifting frame is installed at the rear. The rear end of the connecting cylinder (12) is the push-pull stroke cylinder (13) and is fixed together with the push rod base (15) and the positioning plate (18) through the push-pull stroke cylinder (13); the push rod (6) is installed in the connecting cylinder (12) and the push-pull stroke cylinder (13) and the front push block (5) is fixed at the front end and the rear push block (20) is fixed at the rear end. (13) The rear spring fixing bolts (21) on both sides of the outside are connected to the rear of the push rod (6), and the front push block (5) abuts against the back of the roller (4); a return spring is installed between the rear spring fixing bolts (21) and the rear spring fixing bolts (19) installed on both sides of the push rod base (15); a clamping lever (14) is installed in the push rod base (15), and a force-adding rod (16) is installed at the upper end of the clamping lever (14) and the lower end abuts against the back of the rear push block (20); the handle (17) The front end is fixed to the rear side of the positioning plate (18), and the force rod (16) is stuck in the positioning plate (18); the front end of the lower gripper (23) is also fixed with a torsion spring pry bar (25). The outer connecting line of the longitudinal section of the torsion spring pry bar (25) is an acute triangle and one end is provided with a pry bar shaft hole. The torsion spring pry bar (25) is installed in the weight reduction groove at the front end of the lower gripper (23) through the pry bar shaft hole and the pry bar pin (26), and the two ends of the pry bar pin (26) are respectively connected to the two ends of the torsion spring pry bar (25). The opposing end faces of the upper gripper (1) and lower gripper (23) that contact the balance iron are all machined with teeth. The two pins 1 (2) and two pins 2 (24) installed in the pin mounting groove at the rear of the upper gripper (1) form a parallelogram structure on both sides of the upper gripper (1) and lower gripper (23) through the connecting plate (3), thus completing the connection between the upper gripper (1) and lower gripper (23).

2. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 1, characterized in that, The upper gripper (1) and the lower gripper (23) are provided with a weight reduction groove and a pin mounting groove. The front end of the upper gripper (1) and the lower gripper (23) are respectively provided with opposite inclined surfaces. The roller (4) and the pin (2) are respectively installed in the pin mounting groove at the rear of the upper gripper (1) and the lower gripper (23).

3. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 2, characterized in that, The torsion spring pry bar (25) is an acute triangle with its base flush with the upper surface of the lower gripper (23) and the acute angle facing the front end of the lower gripper (23).

4. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 2, characterized in that, The lower rear side of the front push block (5) is fixedly connected to the push rod (6) that passes through the fixed plate (8), for example by welding or screws. The longitudinal section of the front body of the front push block (5) is an arc structure that extends forward, and the angle of the arc structure is tangent to the arc of the roller (4).

5. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 1, characterized in that, The outer diameter of the connecting cylinder (12) is larger than the outer diameter of the push-pull stroke cylinder (13). The rear outer wall of the connecting cylinder (12) is provided with a lifting frame limiting platform and the front of the outer wall connected to the push-pull stroke cylinder (13) is provided with an external thread that can be connected to the lifting frame limiting nut (22). A lifting frame is installed between the lifting frame limiting platform and the lifting frame limiting nut (22). The lifting frame limiting nut (22) is a round nut with a fastening groove or wrench square on the outer wall.

6. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 5, characterized in that, The fixed plate (8), connecting cylinder (12) and push-pull stroke cylinder (13) are fitted with the push rod (6) with clearance; the push-pull stroke cylinder (13) has push rod stroke grooves on both sides of its body, and the rear spring fixing bolt (21) is inserted into the push rod stroke groove and connected to the push rod (6); the length of the push rod stroke groove is consistent with the forward distance of the upper gripper (1); the height of the fixed plate (8) is greater than the height of the roller (4) installed in the upper gripper (1), and the front spring fixing bolt (7) is installed on both sides of the upper end of the fixed plate (8).

7. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 5, characterized in that, The hoisting frame is provided with a connecting end plate (9), a front support plate (10) and a rear support plate (11). The front support plate (10) and the rear support plate (11) are L-shaped plates with mounting holes. The front support plate (10) and the rear support plate (11) are fitted over the outside of the connecting cylinder (12) through the mounting holes. The connecting end plate (9) is fixed together with the short plate in the L-shaped plate of the front support plate (10) and the rear support plate (11).

8. The device for replacing the balance iron of a belt-driven pumping unit as described in claim 7, characterized in that, in The non-fixed ends of the connecting end plate (9) and the front support plate (10) and the rear support plate (11) are also provided with hoisting equipment connecting columns.

9. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 1, characterized in that, The push rod base (15) is a U-shaped base. A clamping lever (14) is installed in the U-shaped groove of the push rod base (15) by means of a shaft pin. The two rear spring fixing bolts (19) are installed in the body on both sides of the lower part of the push rod base (15). The two rear spring fixing bolts (19) are installed in parallel with the first rear spring fixing bolt (21).

10. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 9, characterized in that, The lower part of the clamping lever (14) is an arc-shaped rod, the middle part of the rod is connected to the shaft pin installed in the push rod base (15), and the upper part of the rod is connected to the force-adding rod (16). The lower end of the clamping lever (14) abuts against the rear side of the push block (20) fixed to the rear end of the push rod (6).

11. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 10, characterized in that, The positioning plate (18) is a U-shaped plate. The front end of the positioning plate (18) is fixed with the push rod base (15) and the rear end is fixed with the reinforcing plate. The groove of the U-shaped groove on the upper part of the positioning plate (18) corresponds to the groove of the U-shaped groove in the push rod base (15). The front end of the handle (17) is fixed together with the reinforcing plate on the rear side of the positioning plate (18).

12. The device for replacing the balance iron in a belt-driven oil pumping unit as described in claim 11, characterized in that, The force-adding rod (16) is a Z-shaped rod. The front end of the Z-shaped rod is threadedly connected to the clamping lever (14), and the rod body connected to the clamping lever (14) is stuck in the U-shaped groove of the positioning plate (18).

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