A rope suspension device for a pumping unit
By designing pulley and gear assemblies for the suspension rope device, and utilizing the principle of movable pulleys and damping bearings, the problem of excessive load on the traction rope of the oil pumping unit was solved, extending the service life of the traction rope and improving the reliability of the oil pumping unit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DAQING OILFIELD CO LTD
- Filing Date
- 2024-11-27
- Publication Date
- 2026-05-29
AI Technical Summary
Excessive load on the traction rope of the oil pumping unit leads to a short service life, easy fatigue breakage, and economic losses.
Design a suspension rope device, including a pulley assembly and a gear assembly, to reduce the load on the traction rope through the principle of movable pulleys, and to stabilize the movement of the donkey head and buffer the impact inertia through damping bearings and resistance components.
It effectively reduces the load on the traction rope, extends its service life, improves the reliability of the oil pumping unit, and reduces losses caused by rope breakage.
Smart Images
Figure CN122106495A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of suspension rope devices for oil pumping units, specifically a suspension rope device for oil pumping units. Background Technology
[0002] The basic characteristics of a beam pumping unit are its simple structure, ease of manufacture, and, most importantly, its ability to operate reliably in oilfields around the clock for extended periods. Therefore, it remains widely used in oilfields. During operation, the walking beam's head is connected to the wellhead suspension device via a traction rope, which in turn drives the oil pump inside the well. Since the traction rope at the walking beam's end typically bears a tensile load of over 5 tons, adjusting the pumping unit's stroke often requires the traction rope to withstand excessive tension, shortening its lifespan. If the rope fails due to fatigue, the time-consuming repairs or the inability to restore the pump's functionality will result in significant economic losses. Summary of the Invention
[0003] To overcome the shortcomings of existing oil pumping unit traction ropes, which bear large loads and thus affect their lifespan, this invention provides a suspension rope device for oil pumping units. This suspension rope device can greatly reduce the load borne by the traction rope, thereby extending the service life of the traction rope and reducing losses caused by traction rope breakage.
[0004] The technical solution of the present invention is: a suspension rope device for a pumping unit, comprising a walking beam, a wellhead suspension rope device, a traction rope, and a weight reduction device. The weight reduction device includes a pulley assembly, which includes a main pulley and a mounting shaft. The main pulley is connected to the outside of the mounting shaft, and the lower end of the mounting shaft is connected to an intermediate shaft via a connecting rod. The traction rope passes over the main pulley and its end is fixed to the inside of the main pulley. The upper end of the wellhead suspension rope device is connected to the wellhead traction rope, and the wellhead traction rope is connected to the intermediate shaft.
[0005] Furthermore, the weight reduction device is provided with a housing assembly on the outside, which is supported on the ground by support legs.
[0006] Furthermore, the housing assembly includes a bottom plate and a top plate, with two opposing side plates and two mounting plates respectively connected between the bottom plate and the top plate, and the mounting plates having longitudinal bearing rolling grooves.
[0007] Furthermore, the weight reduction device also includes gear assemblies, of which there are two, symmetrically arranged on both sides of the pulley assembly; the gear assembly includes a meshing spur gear and a toothed plate, wherein the spur gear is fixed on the mounting shaft, and the toothed plate is fixed on the inner side wall of the mounting plate.
[0008] Furthermore, both ends of the mounting shaft and the intermediate shaft are located within the bearing rolling grooves of the mounting plates on both sides.
[0009] Furthermore, damping bearings are provided at both ends of the mounting shaft and the intermediate shaft, and the damping bearings are located in the bearing rolling groove.
[0010] Furthermore, it also includes two resistance components, each including a vertical plate located outside the mounting plate. The mounting shaft and intermediate shaft pass through the bearing rolling groove and are connected to the vertical plate. The vertical plate is provided with two horizontal wheel axles, each wheel axle being provided with two wheels that are rolled together.
[0011] Furthermore, the bearing rolling groove on the mounting plate is provided with roller grooves on both sides, and the wheel rim is located in the corresponding roller groove.
[0012] Furthermore, a circular hole is formed at the center of the top plate, and a notch is formed between the circular hole and one side of the top plate.
[0013] Furthermore, a through hole is provided at the center of the base plate.
[0014] Furthermore, there are two connecting rods, located on both sides of the main pulley; bearings are provided between the connecting rod and the mounting shaft, and between the connecting rod and the intermediate shaft.
[0015] The present invention has the following beneficial effects: Due to the above-mentioned scheme, the traction rope and the main pulley of the suspension device form a set of movable pulleys. According to the force-saving principle of movable pulleys, without considering the angle change of the traction rope caused by the swing of the donkey head, the load borne by the traction ropes on both sides of the main pulley is only half that of the conventional direct connection. Considering the frictional resistance inside the suspension device, the load borne by the traction rope is also much smaller than that borne by the traction rope in the conventional direct connection. This greatly reduces the load of the tension of the rope connecting the end of the pumping unit's walking beam, improves the reliability of the pumping unit's operation, and also extends the service life of the rope. Meanwhile, the meshing action of the spur gear and the toothed plate stabilizes the reciprocating linear motion of the main pulley, and the meshing resistance between the spur gear and the toothed plate also buffers the impact inertia of the donkey head suspension point to a certain extent. By opening a bearing rolling groove on the mounting plate, the mounting shaft and the intermediate shaft are connected by a damping bearing in the bearing rolling groove. On the one hand, this prevents angular deviation or positional slippage between the mounting shaft and the intermediate shaft. On the other hand, the damping bearing can buffer the impact inertia brought about by the heavy reciprocating motion of the donkey head, thus solving the problems of large acceleration and poor balance of the donkey head suspension point motion. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the present invention;
[0017] Figure 2 This is a schematic diagram showing the location of the weight reduction device;
[0018] Figure 3 This is an exploded view of the weight reduction device;
[0019] Figure 4 This is an exploded view of the housing assembly;
[0020] Figure 5 This is a schematic diagram of the gear assembly and pulley assembly in the weight reduction device;
[0021] Figure 6 , Figure 7 These are exploded views of the gear assembly and the pulley assembly, respectively.
[0022] In the diagram, 1-walking beam, 2-wellhead suspension rope device, 3-weight reduction device, 4-shell assembly, 5-resistance vehicle group, 6-traction rope, 7-support leg, 31-pulley assembly, 32-gear assembly, 311-mounting shaft, 312-main pulley, 313-intermediate shaft, 314-connecting rod, 315-damping bearing, 316-bearing, 321-spur gear, 322-tooth plate, 41-bottom plate, 42-mounting plate, 43-side plate, 44-top plate, 411-through hole, 421-bearing rolling groove, 422-roller groove, 441-top plate notch, 51-vertical plate, 52-wheel, 53-wheel axle. Detailed Implementation
[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] In the description of this invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0025] Depend on Figures 1 to 7 As shown, a suspension rope device for an oil pumping unit includes a walking beam 1, a wellhead suspension rope device 2, a traction rope 6, and a weight reduction device 3. The weight reduction device 3 is provided with a housing assembly 4 on its exterior. Two support legs 7 are connected to the housing assembly 4 and are fixed to the ground at the wellhead.
[0026] The housing assembly 4 includes a base plate 41 and a top plate 44. Two opposing side plates 43 and two mounting plates 42 are connected between the base plate 41 and the top plate 44, respectively. The weight-reducing device 3 is located inside the housing assembly 4. The two opposing mounting plates 42 are used to connect the weight-reducing device 3. A protective housing 45 is also provided outside the mounting plates 42. The protective housing 45 is fixed to the base plate 41 and the top plate 44, respectively, so that the housing assembly 4 is enclosed on all sides. Two support legs 7 are fixed to the two protective housings 45, respectively. The mounting plate 42 has a longitudinal bearing rolling groove 421 located at the center of the longitudinal direction of the mounting plate 42. Roller grooves 422 are provided on both sides of the bearing rolling groove 421. Both the bearing rolling groove 421 and the roller groove 422 penetrate the mounting plate 42. The bearing rolling groove 421 is used to connect the weight reduction device 3, which can move up and down along the bearing rolling groove 421. The roller groove 422 is used to connect the resistance component 5, which can move up and down along the roller groove 422, serving as a guide and straightening component.
[0027] A circular hole is formed at the center of the top plate 44, and a notch 441 is formed between the circular hole and one side of the top plate. The circular hole in the top plate is for the traction rope 6 to pass through, and the notch 441 allows space for the traction rope 6 to swing. A through hole 411 is formed at the center of the bottom plate 41, and the wellhead traction rope connected to the upper end of the wellhead suspension rope device 2 passes through the through hole 411 and is connected to the weight reduction device 3.
[0028] The weight reduction device 3 includes a pulley assembly 31 and a gear assembly 32. The pulley assembly 31 includes a main pulley 312 and a mounting shaft 311. The main pulley 312 is connected to the outside of the mounting shaft 311 and can rotate freely relative to the mounting shaft 311. The outer surface of the main pulley 312 is provided with a groove, and a traction rope can be wound in the groove during use. Damping bearings are respectively fitted at both ends of the mounting shaft 311. The damping bearings are located in the bearing rolling groove 421 of the mounting plate 42. When the main pulley 312 moves up and down, the damping bearings slide up and down in the bearing rolling groove 421. The lower end of the mounting shaft 311 is connected to the intermediate shaft 313 via a connecting rod 314. Both ends of the intermediate shaft 313 are also fitted with damping bearings 315, which are located within the bearing rolling groove 421. This prevents angular deviation or positional slippage between the mounting shaft 311 and the intermediate shaft 313. Simultaneously, the two sets of damping bearings buffer the impact inertia caused by the reciprocating motion of the heavy donkey head, solving the problems of large acceleration and poor balance during the donkey head suspension point motion. Two connecting rods 314 are located on either side of the main pulley 312. Bearings 316 are provided between the connecting rod 314 and the mounting shaft 311, and between the connecting rod 314 and the intermediate shaft 313, allowing relative rotation between the connecting rod 314 and the mounting shaft 311.
[0029] Two gear assemblies 32 are symmetrically arranged on both sides of the pulley assembly 31. Each gear assembly 32 includes a spur gear 321 and a toothed plate 322, which mesh with each other. The spur gear 321 is connected to the mounting shaft 311 and can rotate relative to it. The toothed plate 322 is fixed to the inner wall of the mounting plate 42, ensuring that it does not obstruct the bearing rolling groove 421 and the roller groove 422. When the mounting shaft 311 moves up and down with the main pulley 312, the spur gear 321 rolls up and down along the toothed plate 322, preventing the mounting shaft 311 and the main pulley 312 from swaying and stabilizing the reciprocating linear motion of the main pulley. The meshing resistance between the spur gear 321 and the toothed plate 322 also buffers the impact inertia of the donkey head suspension point to a certain extent.
[0030] After the traction rope 6 passes through the groove of the main pulley 312, its end is fixed to the inside of the main pulley 312. When the device is running, the traction rope 6 drives the main pulley 312 to rotate, and layers of rolling and pressing are achieved on the surface of the main pulley 312. The upper end of the wellhead suspension rope device 2 is connected to the wellhead traction rope, which is connected to the intermediate shaft 313. To prevent the wellhead traction rope from moving laterally, a circular hole can be machined in the middle of the intermediate shaft 313, and the wellhead traction rope is connected in the circular hole. In this way, when the traction rope 6 moves upward, it pulls the main pulley 312 to move upward. The main pulley 312 drives the spur gear 321 through the mounting shaft 311, causing the spur gear 321 to roll upward along the tooth plate 322, thereby pulling the wellhead traction rope and the wellhead suspension rope device 2 upward. Since the traction rope 6 passes through the main pulley 31, a movable pulley structure is formed between the two. According to the force-saving principle of the movable pulley, the load on the traction rope 6 is greatly reduced.
[0031] The suspension rope device also includes two resistance components 5, which are symmetrical about the main pulley 312. When the weight-reducing device 3 is working, the resistance components 5 act as a centering and guiding element. Each resistance component 5 includes a vertical plate 51 located outside the mounting plate 42. The mounting shaft 311 and the intermediate shaft 313 pass through the bearing rolling groove 421 and are connected to the vertical plate 51, thus connecting the resistance component 5 to the mounting plate 42, allowing it to move up and down together with the main pulley 312. The vertical plate 51 has two horizontal axles 53, each with two wheels 52, which are rotatably connected to the axle 53. The vertical plate 51 has four through slots, with each wheel 52 located in one slot. Each wheel axle 53 passes through the vertical plate 51 and the two wheels 52. The rim of the wheel 52 is located in the corresponding roller groove 422. When the upright plate 51 moves up and down with the main pulley 312, the wheel 52 rolls up and down in the roller groove 422, which can play a guiding and straightening role.
[0032] When the pumping unit is running, the traction rope 6 on the walking beam 1 passes through the arc-shaped notch 441 on the housing assembly 4, then goes around the main pulley 312, and finally the end of the traction rope 6 is fixed to the inside of the main pulley 312; the wellhead suspension rope 2 is connected to the wellhead traction rope, and the upper end of the wellhead traction rope is connected to the intermediate shaft 313. When the pumping unit moves upward, the traction rope 6 pulls the main pulley 312 upward, and the traction rope pressed against the main pulley 312 opens layer by layer, and drives the spur gear 321 to roll upward along the tooth plate 322 through the mounting shaft 311. At the same time, the intermediate shaft 313 drives the wellhead traction rope and the wellhead suspension rope 2 to move upward, realizing oil pumping; at this time, the wheels 52 of the resistance vehicle group 5 roll upward along the roller groove 422, which plays a guiding and straightening role. When the pumping unit moves downwards, the wellhead suspension rope 2 and the wellhead traction rope move downwards under the gravity of the downhole pumping unit. Through the intermediate shaft 313 and the mounting shaft 311, the main pulley 312 moves downwards. At the same time, the main pulley 312 rotates in the opposite direction, so that the traction rope 6 is pressed layer by layer on the surface of the main pulley 312.
[0033] The working principle of this suspension device is as follows: a movable pulley structure is formed between the traction rope 6 and the main pulley 312. According to the force-saving principle of the movable pulley, without considering the angle change of the traction rope 6 caused by the swing of the donkey's head, the load borne by the traction rope 6 on both sides of the main pulley 312 is only half that of the conventional direct connection. However, the frictional resistance inside the weight reduction device 3 should be considered, such as the meshing rotational resistance between the spur gear 321 and the toothed plate 322, and the rolling friction between the resistance vehicle group 5 and the roller groove 422. Therefore, this device is designed as in this embodiment to reduce these resistances as much as possible. Finally, the load borne by the traction rope 6 on both sides of the main pulley 312 is slightly greater than half of the load borne by the traction rope 6 in the conventional direct connection, but much less than the load borne by the direct connection, thereby extending the service life of the traction rope and reducing the loss caused by the breakage of the traction rope. Meanwhile, the meshing action of the spur gear and the toothed plate stabilizes the reciprocating linear motion of the main pulley, and the meshing resistance between the spur gear and the toothed plate also buffers the impact inertia of the donkey head suspension point to a certain extent. By opening a bearing rolling groove on the mounting plate, the mounting shaft and the intermediate shaft are connected by a damping bearing in the bearing rolling groove. On the one hand, this prevents angular deviation or positional slippage between the mounting shaft and the intermediate shaft. On the other hand, the damping bearing can buffer the impact inertia brought about by the heavy reciprocating motion of the donkey head, thus solving the problems of large acceleration and poor balance of the donkey head suspension point motion.
[0034] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A suspension device for an oil pumping unit, comprising a walking beam (1), a wellhead suspension device (2), and a traction rope (6), characterized in that: It also includes a weight reduction device (3), which includes a pulley assembly (31). The pulley assembly (31) includes a main pulley (312) and a mounting shaft (311). The main pulley (312) is connected to the outside of the mounting shaft (311), and the lower end of the mounting shaft (311) is connected to the intermediate shaft (313) through a connecting rod (314). The end of the traction rope (6) is fixed inside the main pulley (312) after passing over the main pulley (312). The upper end of the wellhead suspension rope device (2) is connected to the wellhead traction rope, and the wellhead traction rope is connected to the intermediate shaft (313).
2. The suspension rope device for an oil pumping unit according to claim 1, characterized in that: The weight reduction device (3) is provided with a housing assembly (4) on the outside, and the housing assembly (4) is supported on the ground by support legs (7).
3. The suspension rope device for an oil pumping unit according to claim 2, characterized in that: The housing assembly (4) includes a bottom plate (41) and a top plate (44). Two opposing side plates (43) and two mounting plates (42) are connected between the bottom plate (41) and the top plate (44), respectively. The mounting plate (42) has a longitudinal bearing rolling groove (421).
4. The suspension rope device for an oil pumping unit according to claim 3, characterized in that: The weight reduction device (3) also includes a gear assembly (32), which consists of two gear assemblies symmetrically arranged on both sides of the pulley assembly (31). The gear assembly (32) includes a meshing spur gear (321) and a toothed plate (322), wherein the spur gear (321) is fixed on the mounting shaft (311) and the toothed plate (322) is fixed on the inner wall of the mounting plate (42).
5. The suspension rope device for an oil pumping unit according to claim 4, characterized in that: The mounting shaft (311) and intermediate shaft (313) are located at both ends in the bearing rolling grooves (421) of the mounting plates (42) on both sides.
6. The suspension rope device for an oil pumping unit according to claim 5, characterized in that: The mounting shaft (311) and the intermediate shaft (313) are respectively provided with damping bearings (3215) at both ends, and the damping bearings (3215) are located in the bearing rolling groove (421).
7. The suspension rope device for an oil pumping unit according to claim 5 or 6, characterized in that: It also includes two resistance components (5), each resistance component (5) including a vertical plate (51) located outside the mounting plate (42), the mounting shaft (311) and the intermediate shaft (313) passing through the bearing rolling groove (421) and connected to the vertical plate (51); the vertical plate (51) is provided with two horizontal wheel axles (53), each wheel axle (53) is provided with two wheels (52) rollingly connected.
8. The suspension rope device for an oil pumping unit according to claim 7, characterized in that: The bearing rolling groove (421) on the mounting plate (42) is provided with roller grooves (422) on both sides, and the wheel rim (52) is located in the corresponding roller groove (422).
9. The suspension rope device for an oil pumping unit according to claim 3, characterized in that: A circular hole is opened at the center of the top plate (44), and a notch (441) is opened between the circular hole and one side of the top plate.
10. The suspension rope device for an oil pumping unit according to claim 3, characterized in that: A through hole (411) is provided at the center of the base plate (41).
11. The suspension rope device for an oil pumping unit according to claim 1, characterized in that: There are two connecting rods (314), located on both sides of the main pulley (312); bearings are provided between the connecting rod (314) and the mounting shaft (311), and between the connecting rod (314) and the intermediate shaft (313).