A beam body of a beam pumping unit
By installing an adjustment device between the walking beam and the tail shaft seat of the walking beam pumping unit, the problems of large load variations and swaying of the suspended tail beam under high strokes are solved, realizing stable operation of the pumping unit and adjustment of various stroke lengths to meet the needs of different working conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CNPC BOHAI EQUIP MFG
- Filing Date
- 2024-12-02
- Publication Date
- 2026-06-02
AI Technical Summary
Existing beam pumping units cannot operate stably under conditions of large load variations and high strokes. The suspended tail beam is prone to swaying, leading to instability of the center of gravity, unilateral deviation, and even accidents.
A walking beam structure is designed. By setting an adjustment device between the walking beam and the tail shaft seat, and using the cooperation of the slot plate and the set screw plate, the longitudinal movement of the tail shaft seat can be realized to adjust the stroke length. Combined with the suspension structure fastened by the pressure plate and bolts, it can adapt to different load conditions.
This expands the application range of the beam pumping unit, ensures stability and ease of operation under high-stroke conditions, and improves the efficiency of mining operations.
Smart Images
Figure CN122129224A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a beam pumping unit, and more particularly to a beam body of a beam pumping unit, belonging to the field of oil and gas development technology. Background Technology
[0002] Mechanical oil extraction is the most widely used oil extraction technology, with the beam pumping unit being the primary extraction equipment. For many years, the four-bar linkage beam pumping unit has dominated mechanical oil extraction due to its simple structure, strong adaptability, convenient operation, and ease of maintenance. After an oil field is put into development, as extraction time increases, the energy of the oil layer itself is gradually consumed, causing the oil layer pressure to continuously decrease. Extensive degassing of underground crude oil increases viscosity, and the suspension load of the pumping unit also continuously increases with extraction time. Therefore, when selecting a pumping unit in the initial stage of production, it is selected based on a 25% to 40% increase in current load, and multiple strokes are designed to ensure the pumping unit's balance and stable operation under different load conditions by selecting appropriate strokes. The more adjustable strokes, the stronger the adaptability to load changes, and the better the balance and energy-saving effect. The four-bar linkage beam pumping unit has multiple crank pin holes on the crank, and the stroke is adjusted by adjusting the distance between the crank pin and the crank rotation center. However, due to the high strength requirements of the crank pin, the large diameter of the pin, and the small crank space and the small distance between pins for different strokes, small pumping units can generally only be designed with 1 to 3 strokes, while medium and large pumping units can be designed with 3 to 4 strokes.
[0003] With the advancement of energy extraction technology, the technical requirements for beam pumping units in coalbed methane extraction, shale gas extraction, oil well extraction, and water injection well extraction are becoming increasingly stringent. The load variations are also becoming larger, sometimes reaching 50% to 100%, and the rate of variation is also accelerating. This necessitates frequent adjustments to pumping unit parameters and reasonable configuration of stroke length. However, beam pumping units, especially small ones, are limited by their structural dimensions, and adjusting the stroke simply by changing the crank pin installation position cannot meet production demands.
[0004] The stroke rate of a beam pumping unit needs to be adjusted according to changes in operating conditions. Suspended tail beams are used because they are easier to install and remove than flange-type tail beams. However, current suspended tail beam installation methods are suitable for low stroke rates (≤5 strokes / minute). When the pumping unit's stroke rate exceeds 6 strokes / minute, the suspended tail beam will sway, leading to instability of the center of gravity, unilateral lateral deviation, and pumping unit instability. In severe cases, this can even cause the beam and the entire unit to overturn. Summary of the Invention
[0005] In order to overcome the shortcomings of existing walking beam pumping units, which cannot meet the production needs of large load variations by adjusting the stroke by changing the crank pin installation position, and the instability of the center of gravity and unidirectional lateral deviation caused by the swaying of the suspended tail walking beam at high strokes, the present invention provides a walking beam body for a walking beam pumping unit.
[0006] The technical solution adopted by this invention to solve its technical problem is as follows: a walking beam body of a beam pumping unit, comprising a walking beam body, a crank, and a connecting rod, wherein the lower end of the connecting rod is connected to the crank via a crank pin, and the crank is provided with two or more crank pin holes; the upper end of the connecting rod is connected to the tail shaft seat; an adjustment device is provided on the bottom surface of the walking beam body between the central shaft seat and the tail walking beam body, and the tail shaft seat is connected to the adjustment device; the walking beam body and the adjustment device are provided with three or more pairs of mounting holes in the longitudinal direction for fixing the position of the tail shaft seat; the stroke of the pumping unit is adjusted by adjusting the longitudinal position of the tail shaft seat and the walking beam body and / or the connection position of the lower end of the connecting rod to the crank.
[0007] Furthermore, the slot plate of the adjustment device is fixedly connected to the walking beam, and C-shaped grooves are provided on both sides of the slot plate facing each other.
[0008] The C-shaped grooves on both sides of the card slot plate are provided with positioning holes in a horizontal pair for fixing the top screw plate.
[0009] The set screw plate, the bottom plate of the tail shaft seat, and the set screw plate are sequentially arranged in the C-shaped groove; the set screw plate is fixedly connected to the slot plate, and the set screw connected to the set screw plate is adjusted to push the tail shaft seat to move longitudinally along the traveling beam.
[0010] When adjusting the position of the tail shaft seat, first adjust the position of the set screw plate and fix it with the slot plate; adjust the set screw to push the tail shaft seat to the target position; then fix the walking beam, slot plate and tail shaft seat together.
[0011] Furthermore, the tail beam is suspended at the rear end of the walking beam.
[0012] The walking beam is equipped with a suspension device for the tail walking beam.
[0013] The suspension device is fixedly connected to the walking beam body. A walking beam pin is installed at the upper end of the tail walking beam body. The walking beam pin is located in the groove on the suspension device. A pressure plate fixedly installed on the suspension device restricts the walking beam pin in the groove.
[0014] The connecting surface of the hanger and pressure plate is an inclined surface that slopes towards the front end of the walking beam.
[0015] The beneficial effects of this invention are: a reasonable structural design; by adjusting the installation positions of the upper and lower ends of the connecting rod, various stroke lengths can be reasonably configured to adapt to different load conditions, meet the process requirements of different strokes in mining operations, and expand the application range of the walking beam pumping unit; the suspension structure of the tail walking beam can prevent the pumping unit from shaking due to tail walking beam skew caused by increased strokes, ensuring the stability of the pumping unit; simple operation, convenient adjustment, and effective improvement of mining operation efficiency. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the walking beam structure of a walking beam pumping unit according to the present invention.
[0017] Figure 2 This is a schematic diagram of the downstream beam structure in this invention.
[0018] Figure 3 yes Figure 2 H-direction view (structural schematic diagram of the adjustment device).
[0019] In the diagram: 1. Counterweight, 2. Tail beam, 3. Walking beam, 4. Center shaft seat, 5. Adjustment device, 6. Pressure plate, 7. Walking beam pin, 8. Groove, 9. Positioning hole, 10. Tail shaft seat, 11. Connecting rod, 12. Crank pin, 13. Crank, 14. Hanger, 15. Suspension device, 16. Mounting hole, 20. Set screw plate, 21. Set screw, 22. Slot plate, 23. Tail shaft seat bolt, 24. Set screw plate bolt, 25. C-groove. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that the present invention is not limited to the specific embodiments listed, and any embodiment that conforms to the spirit of the present invention should be included within the scope of protection of the present invention.
[0021] In the description of this invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of this invention, 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. Therefore, they should not be construed as limitations on this invention.
[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium; it can also refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0023] See appendix Figure 1-3 The present invention discloses a walking beam body of a walking beam pumping unit, comprising a walking beam body 3, a crank 13, and a connecting rod 11. The lower end of the connecting rod 11 is hinged to the crank 13 via a crank pin 12, and the crank 13 is provided with two or more crank pin holes. The upper end of the connecting rod 11 is hinged to the tail shaft seat 10. An adjustment device 5 is provided on the bottom surface of the walking beam body 3 between the central shaft seat 4 and the tail walking beam body 2, and the tail shaft seat 10 is connected to the adjustment device 5. The walking beam body 3 and the adjustment device 5 are provided with three or more pairs of mounting holes 16 along the longitudinal direction for fixing the position of the tail shaft seat 10.
[0024] The stroke of the pumping unit is adjusted by adjusting the longitudinal position of the tail shaft seat 10 and the walking beam 3 and / or the connection position of the lower end of the connecting rod 11 and the crank 13.
[0025] The slot plate 22 of the adjustment device 5 is fixedly connected to the walking beam 3, and C-shaped grooves 25 are provided on both sides of the slot plate 22 facing each other.
[0026] Furthermore, the C-shaped grooves 25 on both sides of the card slot plate 22 are provided with positioning holes 9 in a horizontal pair for fixing the top screw plate 20.
[0027] Furthermore, the top screw plate 20, the bottom plate of the tail shaft seat 10, and the top screw plate 20 are sequentially arranged in the C-shaped groove 25; the top screw plate 20 is fixedly connected to the slot plate 22, and the top screw 21 connected to the top screw plate 20 is adjusted to push the tail shaft seat 10 to move longitudinally along the walking beam 3.
[0028] When it is necessary to adjust the position of the tail shaft seat 10, first adjust the set screw plate 20 to the appropriate position and fix it with the slot plate 22; adjust the set screw 21 to push the tail shaft seat 10 to the target position; then fix the walking beam 3, the slot plate 22, and the tail shaft seat 10 together.
[0029] The tail beam 2 is suspended at the rear end of the walking beam 3.
[0030] The walking beam 3 is provided with a suspension device 15 for the tail walking beam 2.
[0031] Furthermore, the hanger 14 of the suspension device 15 is fixedly connected to the walking beam body 3, and the upper end of the tail walking beam body 2 is equipped with a walking beam pin 7, which is located in the groove 8 on the hanger 14; the pressure plate 6 fixedly installed on the hanger 14 limits the walking beam pin 7 in the groove 8. Preferably, the pressure plate 6 and the hanger 14 are fixedly connected by bolts.
[0032] Furthermore, the connecting surfaces of the hanger 14 and the pressure plate 6 are inclined surfaces that slope towards the front end of the walking beam 3. The tail walking beam suspension structure, which is fastened with pressure plates and bolts, allows the pumping unit with the tail walking beam to adapt to higher stroke rates, solving the problem that existing tail walking beam suspension structures can only be applied to low-speed conditions, and that the pumping unit shakes due to tail walking beam skew when the stroke rate increases.
[0033] Example:
[0034] See appendix Figure 1 This invention discloses a walking beam body for a beam-type pumping unit. Along the longitudinal direction of the pumping unit's base, a motor, a reducer, and a support are sequentially arranged. The walking beam body 3 is mounted above the support via a central shaft seat 4. A donkey head is mounted at the front end of the walking beam body 3, and a tail walking beam body 2 is suspended at the rear end of the walking beam body 3. A counterweight 1 is provided at the lower end of the tail walking beam body 2. One end of the crank 13 is connected to the output shaft of the reducer, and the other end of the crank 13 is hinged to the lower end of the connecting rod 11 via a crank pin 12. The reducer drives the crank 13 to rotate around its output shaft. The crank 13 has two crank pin holes, and the connection position between the crank 13 and the connecting rod 11 is determined according to the pumping unit's stroke.
[0035] The connecting rods 11 are arranged symmetrically on the left and right sides, and the two symmetrically arranged connecting rods 11 are fixedly connected by a crossbeam. The upper end of the connecting rod 11 is hinged to the tail shaft seat 10, which has four mounting holes and is fixedly connected to the adjusting device 5 and the walking beam 3 by tail shaft seat bolts 23.
[0036] The adjustment device 5 includes a slot plate 22, a top screw plate 20, and a top screw 21. The slot plate 22 is fixedly installed on the bottom surface of the walking beam 3, and is usually fixedly connected by welding.
[0037] The card slot plate 22 has C-shaped grooves 25 facing each other on both sides.
[0038] The slot plate 22 has C-shaped grooves 25 on both sides with positioning holes 9 arranged in pairs to fix the top screw plate 20.
[0039] The set screw plate 20, the base plate of the tail shaft seat 10, and the set screw plate 20 are sequentially arranged in the C-shaped groove 25 and can move longitudinally along the C-shaped groove 25. The set screw plate 20 is fixedly connected to the slot plate 22 by set screw plate bolts 24 through positioning holes 9. Adjusting the set screw 21 connected to the set screw plate 20 pushes the tail shaft seat 10 to move longitudinally along the walking beam 3.
[0040] When it is necessary to move the tail shaft seat 10 (e.g.) Figure 2 , 3 (as shown),
[0041] First, adjust the set screw plates 20 at both ends of the tail shaft seat 10 to the appropriate position, and pass the set screw plate bolts 24 through the positioning holes 9 of the C-shaped groove 25 to fix the set screw plate 20 to the slot plate 22.
[0042] Then, remove the tail shaft seat bolt 23 and adjust the set screw 21 to push the tail shaft seat 10 to the target position;
[0043] Then, the tail shaft seat bolt 23 passes through the hole in the tail shaft seat 10 and the mounting holes 16 in the walking beam body 3 and the slot plate 22 to fix the walking beam body 3, the slot plate 22 and the tail shaft seat 10 together.
[0044] Then tighten the locking nut on the set screw 21 to fix the set screw 21 axially.
[0045] The rear end of the walking beam 3 is provided with a suspension device 15 for the tail walking beam 2 (e.g., Figure 2 (As shown).
[0046] The suspension device 15 includes a bracket 14 and a pressure plate 6. The bracket 14 is connected to the walking beam 3, typically by welding. A walking beam pin 7 is installed at the upper end of the tail walking beam 2. The walking beam pin 7 is located in a groove 8 on the bracket 14. The pressure plate 6, fixedly installed on the bracket 14, confines the walking beam pin 7 within the groove 8. The bracket 14 and the pressure plate 6 are fixedly connected by bolts. The connecting surface of the bracket 14 and the pressure plate 6 is an inclined surface sloping towards the front end of the walking beam 3 to facilitate the attachment of the tail walking beam 2.
[0047] By adjusting the longitudinal position between the tailstock 10 (upper end of connecting rod 11) and the walking beam 3 and / or adjusting the connection position between the lower end of connecting rod 11 and crank 13, various strokes of the pumping unit can be combined. For example, when the walking beam 3 is provided with four pairs of mounting holes 9, the tailstock 10 has three different mounting positions along the walking beam 3; when the crank 13 is provided with two crank pin holes, six different strokes can be combined to meet the mining needs of different working conditions and loads.
[0048] This invention discloses a walking beam body for a beam-type pumping unit, which increases the number of adjustable strokes for beam-type pumping units with the same structural dimensions. This solves the problem that crank-type stroke adjustment is limited by the crank's structural dimensions, and the number of strokes cannot meet the requirements of varying loads and stroke conditions. The tail walking beam suspension structure, secured by pressure plates and bolts, allows the pumping unit to adapt to higher stroke speeds, overcoming the problem that tail walking beam suspension structures are only applicable to low-speed conditions, and that the pumping unit shakes due to tail walking beam skew at higher stroke rates. This ensures the stability of the pumping unit and facilitates the installation and disassembly of the tail walking beam. The addition of a stroke adjustment device and a tail walking beam suspension device to the walking beam body expands the applicability of the beam-type pumping unit and meets the operational needs of changing production conditions.
[0049] It should be noted that the above embodiments are examples and not limitations of the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.
Claims
1. A walking beam body of a beam pumping unit, comprising a walking beam body, a crank, and a connecting rod, wherein the lower end of the connecting rod is connected to the crank via a crank pin, and the crank is provided with two or more crank pin holes; the upper end of the connecting rod is connected to a tail shaft seat, characterized in that: An adjustment device is provided on the bottom surface of the walking beam body between the central shaft seat and the tail walking beam body, and the tail shaft seat is connected to the adjustment device; the walking beam body and the adjustment device are provided with more than 3 pairs of mounting holes along the longitudinal direction for fixing the position of the tail shaft seat. The stroke of the pumping unit is adjusted by adjusting the longitudinal position of the tail shaft seat and the walking beam and / or the connection position of the lower end of the connecting rod and the crank.
2. The walking beam of a beam pumping unit according to claim 1, characterized in that: The adjustment device has a slot plate that is fixedly connected to the walking beam, and C-shaped grooves are provided on both sides of the slot plate facing each other.
3. The walking beam of a beam pumping unit according to claim 2, characterized in that: The C-shaped grooves on both sides of the card slot plate are provided with positioning holes in a horizontal pair for fixing the top screw plate.
4. The walking beam of a beam pumping unit according to claim 3, characterized in that: The set screw plate, the bottom plate of the tail shaft seat, and the set screw plate are sequentially arranged in the C-shaped groove; the set screw plate is fixedly connected to the slot plate, and the set screw connected to the set screw plate is adjusted to push the tail shaft seat to move longitudinally along the traveling beam.
5. The walking beam of a beam pumping unit according to claim 4, characterized in that: When adjusting the position of the tail shaft seat, first adjust the position of the set screw plate and fix it with the slot plate; adjust the set screw to push the tail shaft seat to the target position; then fix the walking beam, slot plate and tail shaft seat together.
6. The walking beam of a beam pumping unit according to claim 1, characterized in that: The tail beam is suspended at the rear end of the walking beam.
7. The walking beam of a beam pumping unit according to claim 6, characterized in that: The walking beam is equipped with a suspension device for the tail walking beam.
8. The walking beam of a beam pumping unit according to claim 7, characterized in that: The suspension device is fixedly connected to the walking beam body. A walking beam pin is installed at the upper end of the tail walking beam body. The walking beam pin is located in the groove on the suspension device. A pressure plate fixedly installed on the suspension device restricts the walking beam pin in the groove.
9. The walking beam of a beam pumping unit according to claim 8, characterized in that: The connecting surface of the hanger and pressure plate is an inclined surface that slopes towards the front end of the walking beam.