Long stroke tower type pumping unit

Abstract

The present application relates to the field of pumping unit, in particular to a long stroke tower type pumping unit. It comprises a pumping tower, a counterweight, a traction mechanism and a driving mechanism, the counterweight is arranged to slide up and down in the pumping tower; the traction mechanism comprises a drum, a flexible traction member and a guide wheel assembly, the drum is rotatably arranged at the bottom of the pumping tower, the guide wheel assembly is arranged at the top of the pumping tower, the flexible traction member is wound around the guide wheel assembly and the drum and tractions the counterweight and the pumping rod, the driving mechanism is used to drive the drum to rotate. The present application configures the traction mechanism to make the movement direction of the pumping rod and the counterweight opposite and make the stroke of the pumping rod greater than that of the counterweight when the drum rotates. In the case of the same height of the pumping tower, the pumping rod has a longer stroke, realizing long stroke pumping of the pumping rod, to meet the best parameter setting of oil production needs.

Description

Technical Field

[0001] This invention relates to the field of oil pumping units, and more specifically to a long-stroke tower-type oil pumping unit. Background Technology

[0002] As petroleum plays an increasingly important role in human industrial production and daily life, oil extraction technology has attracted more and more attention from researchers. Pumping units are widely used oil pumping equipment in oil fields. Based on whether they have walking beams, pumping units can be divided into walking beam pumping units and beamless pumping units. The basic characteristics of walking beam pumping units are simple structure, easy manufacturing, and convenient use. In particular, they can operate reliably in oil fields around the clock for a long time. However, they have disadvantages such as large acceleration of the donkey head suspension point, poor balance effect, low efficiency, and large size and weight during long strokes. Therefore, in recent years, many beamless pumping units have emerged, among which tower pumping units are one type. Tower pumping units combine modern mechanical manufacturing technology and mechatronics technology, with long stroke, low stroke rate, stable operation, low energy consumption, and small footprint, and are widely used in oil fields.

[0003] In related technologies, such as the intelligent tower-type pumping unit with drum winding disclosed in application publication number CN116927724A and the tower-type drum direct-drive belt pumping unit disclosed in authorization announcement number CN221400437U, both employ a belt wound around a drum, with the two ends of the belt pulling a counterweight and a sucker rod respectively. The reciprocating movement of the sucker rod is achieved through the rotation of the drum and the traction of the belt. However, the above solutions are limited by the height of the tower machine, and the maximum stroke is limited, generally not exceeding 8 meters. Its maximum stroke is not the optimal parameter value required for oil production.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a long-stroke tower-type pumping unit to solve the problem of insufficient stroke in existing tower-type pumping units.

[0006] The present invention provides a long-stroke tower-type pumping unit with the following technical solution: including: Oil pumping tower; A counterweight that can slide up and down on the oil pumping tower; The traction mechanism includes a roller, a flexible traction element, and a guide wheel assembly. The roller is rotatably mounted at the bottom of the pumping tower, and the guide wheel assembly is mounted at the top of the pumping tower. The flexible traction element is wound around the guide wheel assembly and the roller and pulls the counterweight and the sucker rod. The traction mechanism is configured such that when the roller rotates, the sucker rod and the counterweight move in opposite directions and the stroke of the sucker rod is greater than the stroke of the counterweight. The drive mechanism is configured to drive the drum to rotate.

[0007] Optionally, the flexible traction component includes a load traction rope and a counterweight traction rope; the drum has a large-diameter outer circumference and a small-diameter outer circumference; the load traction rope is wound around the guide wheel assembly, with one end connected to the sucker rod and the other end connected to the large-diameter outer circumference of the drum; the counterweight traction rope is wound around the guide wheel assembly, with one end connected to the counterweight block and the other end connected to the small-diameter outer circumference of the drum; the ends of the load traction rope and the counterweight traction rope connected to the drum are respectively located on both sides of the drum.

[0008] Optionally, the large-diameter outer circumference of the roller is located in the middle, and the small-diameter outer circumference is located at both ends. There are two counterweight traction ropes, one end of which is connected to both sides of the counterweight block, and the other end of which is connected to the small-diameter outer circumference at both ends of the roller.

[0009] Optionally, the outer circumference of the drum is provided with a spiral groove, and the counterweight traction rope and the load traction rope are disposed in the spiral groove.

[0010] Optionally, the spiral grooves on the two smaller diameter outer circumferences of the roller rotate in opposite directions, and the starting ends of the two counterweight traction ropes are respectively set at the ends of the corresponding spiral grooves that are close to or far from each other.

[0011] Optionally, the guide wheel assembly includes a first guide wheel, which is mounted on the left and right sides of the pumping tower via a support arm. There are two first guide wheels on the side closer to the counterweight. The load traction rope and the counterweight traction rope are respectively connected to the drum through the first guide wheel on the corresponding side.

[0012] Optionally, the flexible traction element includes a first traction belt and a second traction belt, and the roller has a large-diameter outer periphery and a small-diameter outer periphery, wherein the diameter of the large-diameter outer periphery is greater than twice the diameter of the small-diameter outer periphery; The counterweight has a movable pulley inside, which can slide up and down relative to the counterweight. An elastic element is provided between the movable pulley and the counterweight, which makes the movable pulley initially at the lower limit position. The first traction belt is wrapped around the large diameter outer circumference of the drum from below. Then, one end of the belt goes up over the guide wheel assembly and is connected to the sucker rod, while the other end goes up over the guide wheel assembly, down over the movable pulley and is fixed to the oil pumping tower. One end of the second traction belt is connected to the small-diameter outer circumference of the roller, and the other end goes upward around the guide wheel assembly and is connected to the counterweight. One end of the first traction belt connected to the sucker rod and the other end of the second traction belt connected to the drum are located on opposite sides of the drum.

[0013] Optionally, the large-diameter outer circumference of the roller is located in the middle, and the small-diameter outer circumference is located at both ends. There are two second traction belts, one end of which is connected to the small-diameter outer circumference at both ends of the roller, and the other end is passed upward around the guide wheel assembly and connected to both sides of the counterweight.

[0014] Optionally, the guide wheel assembly includes a first guide wheel and a second guide wheel. There are two first guide wheels, which are mounted on the left and right sides of the pumping tower via support arms. The second guide wheel is mounted on one side of the corresponding counterweight block of the pumping tower via support arms and is located above the corresponding first guide wheel. The second guide wheels are arranged in two sets at intervals along the front-rear direction, with two in each set. The first traction belt is wound around the drum and the movable pulley via two first guide wheels; the two second traction belts are respectively connected to the counterweight and the drum via two sets of second guide wheels.

[0015] Optionally, the pumping tower is equipped with a guiding mechanism to guide the up-and-down sliding of the counterweight.

[0016] Optionally, the drive mechanism includes a motor, a reducer, a coupling, and a bearing housing; the motor, reducer, and bearing housing are fixed relative to the pumping tower; two bearing housings are spaced apart along the axial direction of the drum; the two ends of the drum are supported by the two bearing housings respectively; the reducer is located outside the drum; the output end of the reducer is connected to the drum through the coupling; and the output end of the motor is connected to the input end of the reducer.

[0017] Optionally, the drive mechanism includes a motor, a reducer, and a bearing housing. The motor, reducer, and bearing housing are fixed relative to the oil pumping tower. One end of the drum is supported by the bearing housing. The reducer is placed inside the drum, and its output end is connected to the other end of the drum. The output end of the motor is connected to the input end of the reducer.

[0018] Optionally, the pumping tower includes a main frame and a base, with a support seat on the base, and the motor, reducer and bearing housing are all mounted on the support seat.

[0019] Optionally, the top of the pumping tower is provided with an upper platform, and the guide wheel assembly is located on the upper platform.

[0020] Optionally, a fence may be installed around the platform.

[0021] The beneficial effects of this invention are as follows: A long-stroke tower-type pumping unit of this invention is equipped with a counterweight and a traction mechanism including a roller, a flexible traction component, and a guide wheel assembly. The roller is located at the bottom of the pumping tower, and the guide wheel assembly is located at the top of the pumping tower. The flexible traction component is wound around the guide wheel assembly and the roller and pulls the counterweight and the sucker rod. Through the cooperation of the flexible traction component, the roller, and the guide wheel assembly, the stroke of the sucker rod is greater than the stroke of the counterweight during the traction process. With the same pumping tower height, the sucker rod has a longer stroke, achieving long-stroke pumping to meet the optimal parameter settings required for oil production.

[0022] Furthermore, this invention configures the flexible traction component as including a load traction rope and a counterweight traction rope, and configures the drum as having a large-diameter outer circumference and a small-diameter outer circumference; the load traction rope is wound around the top of the guide wheel assembly, with one end connected to the sucker rod and the other end connected to the large-diameter outer circumference of the drum, and the counterweight traction rope is wound around the top of the guide wheel assembly, with one end connected to the counterweight and the other end connected to the small-diameter outer circumference of the drum; because the outer diameters of the drums are different, the winding lengths of the load traction rope and the counterweight traction rope are different when the drum rotates one revolution, and their strokes are different, with the load traction rope having a larger stroke than the counterweight traction rope. When the height of the pumping tower is fixed, that is, when the lifting height of the counterweight remains unchanged, by setting a larger ratio of diameter difference, the load traction rope can achieve long-stroke operation, resulting in a simple and ingenious structure.

[0023] Furthermore, the present invention includes a rotatable and vertically movable pulley on the counterweight block. An elastic element is provided between the movable pulley and the counterweight. The outer diameter of the large-diameter roller is greater than twice the outer diameter of the small-diameter roller. The flexible traction element comprises a first traction belt and a second traction belt. The first traction belt is wound around the outer diameter of the large-diameter roller from below, with one end extending upwards around the guide wheel assembly and connecting to the sucker rod. The other end extends upwards around the guide wheel assembly, downwards around the movable pulley, and upwards and is fixed to the pumping tower. One end of the second traction belt is connected to the outer diameter of the small-diameter roller, and the other end extends upwards around the guide wheel assembly and connects to the counterweight block. This configuration allows for, firstly, long-stroke pumping of oil by the sucker rod through the different diameters of the roller and the movable pulley. Secondly, based on the characteristics of the movable pulley, the ratio of the outer diameter of the drum to its outer diameter is set to be greater than 2. This creates a speed difference between the movable pulley and the counterweight when they are lifted, thereby compressing the elastic element. The elastic element and the counterweight together resist the pulling force of the first and second traction belts. Therefore, the overall mass of the counterweight can be made smaller, making the device lighter and easier to move. Thirdly, because the elastic element is easily compressed initially, in the initial stage of the sucker rod descent (downstroke), the drive mechanism can more easily overcome the static friction of the device to drive the drum to rotate, making the drive mechanism easier and smoother to start. In the initial stage of the sucker rod rise (upstroke), the elastic element releases its elastic force, making it easier for the drive mechanism to overcome the static friction of the device to drive the drum to rotate, again making the drive mechanism easier and smoother to start. In summary, the design of the movable pulley and the elastic element makes the overall operation of the equipment more stable and reliable. Fourthly, during long-term operation, if the first traction belt breaks, the counterweight will still be pulled by the roller through the second traction belt and will not fall and cause a dangerous accident; if the second traction belt breaks, the counterweight will only compress the elastic element and be pulled by the first traction belt and will not fall to the ground and cause a dangerous accident. At the same time, the equipment can still work without affecting the task. In other words, the present invention achieves dual protection for the equipment by setting the first traction belt and the second traction belt, making the equipment more reliable and more practical. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A long-stroke tower-type pumping unit is provided in one embodiment of the present invention; Figure 2 A long-stroke tower-type pumping unit is provided as another embodiment of the present invention; Figure 3 for Figure 2 The front view; Figure 4 for Figure 3 Sectional view of AA; Figure 5 for Figure 2 Top view; Figure 6 for Figure 5 BB section view; Figure 7 This is a schematic diagram of the structure of one embodiment of the roller in this invention; Figure 8 This is a schematic diagram of one embodiment of the drive mechanism in the present invention; Figure 9 This is a schematic diagram of another embodiment of the driving mechanism in this invention.

[0026] In the picture: 1. Pumping tower; 101. Base; 102. Main frame; 103. Support base; 2. Roller; 3. Go to the platform; 4. Load-bearing traction rope; 5. Guide wheel assembly; 501. First guide wheel; 502. Second guide wheel; 6. Fence; 7. Guiding mechanism; 8. Counterweight traction rope; 9. Counterweight; 10. Drive mechanism; 1001. Motor; 1002. Reducer; 1003. Bearing housing; 1004. Coupling; 11. Control cabinet; 12. First traction belt; 1201. Connecting block; 13. Second traction belt; 14. Movable pulley; 15. Elastic components. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0028] Reference Figures 1 to 9 The diagram illustrates the long-stroke tower-type pumping unit provided by the present invention.

[0029] The embodiments of the present invention first provide a long-stroke tower-type pumping unit that can drive the sucker rod to move up and down reciprocally, specifically including a pumping tower 1, a counterweight 9, a traction mechanism and a drive mechanism 10.

[0030] Pumping tower 1 is a steel structure tower, which can be assembled by welding steel pipes, shaped steel, angle steel, steel plates, etc. The steel structure has high strength, is easy to process and manufacture, and is conducive to achieving lightweighting of the equipment.

[0031] The counterweight 9 is slidably mounted on the pumping tower 1; the traction mechanism includes a roller 2, a flexible traction member, and a guide wheel assembly 5. The roller 2 is rotatably mounted on the bottom of the pumping tower 1, and the guide wheel assembly 5 is mounted on the top of the pumping tower 1. The flexible traction member is wound around the guide wheel assembly 5 and the roller 2 and pulls the counterweight 9 and the sucker rod. The traction mechanism is configured such that when the roller 2 rotates, the sucker rod and the counterweight 9 move in opposite directions and the stroke of the sucker rod is greater than the stroke of the counterweight 9; the drive mechanism 10 is configured to drive the roller 2 to rotate.

[0032] The technical solution of this embodiment adopts a tower-type structure. The sucker rod is connected to the piston of the pumping unit installed inside the deep well. During the rotation of the drum 2, the counterweight 9 and the sucker rod balance the traction force, completing the reciprocating lowering and raising of the sucker rod, thereby controlling the reciprocating motion of the pumping unit's piston to achieve oil extraction. Compared with the walking beam pumping unit (nodding donkey pump), the tower-type pumping unit of this invention has a smaller footprint and lighter weight, and can achieve long-stroke, low-sprint operation. Moreover, through the dynamic balance of traction force between the counterweight 9 and the sucker rod, the starting and operating power of the device is small, and the operating current is similar, resulting in energy saving and more stable and reliable operation. At the same time, through the cooperation of the flexible traction component, the drum 2 and the guide wheel assembly 5, the stroke of the sucker rod is greater than the stroke of the counterweight 9 during the traction process. Compared with the existing tower-type pumping units, with the same height of the pumping tower 1, the sucker rod has a longer stroke to meet the optimal parameter settings required for oil production.

[0033] In one embodiment, reference is made to Figure 1 The flexible traction component includes a load traction rope 4 and a counterweight traction rope 8; the drum 2 has a large-diameter outer circumference and a small-diameter outer circumference, the load traction rope 4 is wound around the guide wheel assembly 5, and one end is connected to the sucker rod and the other end is connected to the large-diameter outer circumference of the drum 2; the counterweight traction rope 8 is wound around the guide wheel assembly 5, and one end is connected to the counterweight block 9 and the other end is connected to the small-diameter outer circumference of the drum 2; the ends of the load traction rope 4 and the counterweight traction rope 8 connected to the drum 2 are respectively located on both sides of the drum 2.

[0034] Reference Figure 7The drum 2 is configured with different outer diameters. The load traction rope 4 is wound at the larger diameter Φ1, and the counterweight traction rope 8 is wound at the smaller diameter Φ2. As the drum 2 rotates once, the load traction rope 4 and the counterweight traction rope 8 have different winding lengths, resulting in different strokes. The load traction rope 4 has a longer stroke than the counterweight traction rope 8. Given a fixed height of the pumping tower 1 (i.e., a constant counterweight lifting height), setting a larger diameter difference allows the load traction rope 4 to achieve a longer stroke.

[0035] For example, taking a tower-type pumping unit in related technologies as an example, the outer circumference of the drum 2 in the related technologies is a structure with a uniform diameter. The flexible traction component is a single traction rope, which passes around the drum 2 from below, with one end connected to the sucker rod and the other end connected to the counterweight 9. If the height of the pumping tower 1 is set to 8 meters, then the stroke of the counterweight 9 is S2 = 8 meters, and the maximum stroke of the sucker rod is S1 = 8 meters. This invention changes the structure of the drum 2 by setting two different diameters on the outer circumference of the drum 2. The calculation formula for the stroke S1 of the long-stroke tower-type pumping unit of this invention is:

[0036] Where: Φ1 is the outer diameter of the larger diameter of roller 2, Φ2 is the outer diameter of the smaller diameter of roller 2, and S2 is the stroke of counterweight 9.

[0037] if

[0038] but

[0039] In summary, with the same height of the pumping tower 1, the long-stroke tower-type pumping unit of the present invention can achieve a stroke of more than 20 meters, realizing long-stroke oil production.

[0040] In this embodiment, the large-diameter outer circumference of the roller 2 is located in the middle, and the small-diameter outer circumference is located at both ends. There are two counterweight traction ropes 8, one end of which is connected to both sides of the counterweight block 9, and the other end of which is connected to the small-diameter outer circumference at both ends of the roller 2. This arrangement makes the force on the device more balanced and the operation of the device more stable and reliable.

[0041] In this embodiment, refer to Figure 7 The outer circumference of the drum 2 is provided with a spiral groove, and the counterweight traction rope 8 and the load traction rope 4 are disposed in the spiral groove. The spiral groove allows the counterweight traction rope 8 and the load traction rope 4 to be evenly wound around the outer circumference of the drum 2 along the spiral groove, avoiding stacking and making the device operate more smoothly.

[0042] Furthermore, the spiral grooves on the two smaller diameter outer circumferences of the roller 2 rotate in opposite directions, and the starting ends of the two counterweight traction ropes 8 are respectively set at the ends of the corresponding spiral grooves that are close to or far from each other. This arrangement ensures that the two ends of the counterweight block 9 are subjected to balanced forces, further improving the smoothness of operation.

[0043] In this embodiment, the guide wheel assembly 5 includes a first guide wheel 501. The first guide wheel 501 is set on the left and right sides of the oil pumping tower 1 through the support arm. There are two first guide wheels 501 on the side closer to the counterweight block 9. The load traction rope 4 and the counterweight traction rope 8 are respectively connected to the roller 2 through the first guide wheel 501 on the corresponding side.

[0044] In another embodiment, refer to Figures 2 to 6 The flexible traction component includes a first traction belt 12 and a second traction belt 13. The roller 2 has a large-diameter outer periphery and a small-diameter outer periphery, and the diameter of the large-diameter outer periphery is greater than twice the diameter of the small-diameter outer periphery. The counterweight 9 is provided with a movable pulley 14 inside, which can slide up and down relative to the counterweight 9. An elastic element 15 is provided between the movable pulley 14 and the counterweight 9, which makes the movable pulley 14 initially in the lower limit position. Preferably, the elastic element 15 is a compression spring.

[0045] The first traction belt 12 is wrapped around the large diameter outer circumference of the drum 2 from below. Then, one end of it goes up over the guide wheel assembly 5 and is connected to the sucker rod, and the other end goes up over the guide wheel assembly 5, down over the movable pulley 14 and is fixed upward to the oil pumping tower 1. One end of the second traction belt 13 is connected to the small-diameter outer periphery of the roller 2, and the other end goes upward around the guide wheel assembly 5 and is connected to the counterweight 9; The first traction belt 12 connects to one end of the sucker rod, and the second traction belt 13 connects to one end of the drum 2, located on both sides of the drum 2.

[0046] by Figures 2 to 6 Taking the direction shown as an example, the sucker rod (not shown in the figure) is located on the left, and the counterweight 9 is on the right. A connecting block 1201 is provided at the end of the first traction belt 12 that needs to connect to the sucker rod, facilitating the installation of the sucker rod. In the process of using the solution provided in this embodiment, the drum 2 rotates clockwise, driving the connecting block 1201 downwards via the first traction belt 12, thereby causing the sucker rod to descend. Simultaneously, the counterweight 9 rises under the traction of the first traction belt 12 and the second traction belt 13. Since the first traction belt 12 is wound around the movable pulley 14, the upward speed of the movable pulley 14 is half the downward speed of the connecting block 1201. Furthermore, because the outer diameter of the drum 2 is more than twice the outer diameter of its smaller diameter, the upward speed of the counterweight 9 is less than half the downward speed of the sucker rod. The stroke of the sucker rod is greater than the stroke of the counterweight 9, thus achieving a longer stroke for oil extraction.

[0047] Unlike the previous embodiment, because the first traction belt 12 drives the pulley 14 to rise at a fast speed, while the second traction belt 13 drives the counterweight 9 to rise at a slow speed, the elastic element 15 is compressed. After the elastic element 15 is compressed, it stores energy and, together with the counterweight 9, resists the traction force of the first traction belt 12 and the second traction belt 13. Therefore, the overall mass of the counterweight 9 can be made smaller, making the device lighter and the equipment easier to move.

[0048] Meanwhile, because the elastic element 15 is easily compressed initially, the drive mechanism 10 can more easily overcome the static friction of the device and drive the drum 2 to rotate during the initial stage of the sucker rod descent. In other words, the drive mechanism 10 is easier and smoother to start during the downstroke. Subsequently, as the sucker rod descends and the counterweight 9 rises, the elastic element 15 is gradually compressed, working together with the counterweight 9 to resist the traction force of the first traction belt 12 and the second traction belt 13. After that, the connecting block 1201 descends to its limit, the drum 2 reverses, the connecting block 1201 rises, the counterweight 9 descends, the elastic element 15 releases its elastic force, and the drive mechanism 10 can more easily overcome the static friction of the device and drive the drum 2 to rotate. In other words, the drive mechanism 10 is also easier and smoother to start during the upstroke. In summary, the arrangement of the movable pulley 14 and the elastic element 15 makes the overall operation of the equipment more stable and reliable.

[0049] Furthermore, during prolonged operation, if the first traction belt 12 breaks, the counterweight 9 will still be pulled by the roller 2 via the second traction belt 13, preventing it from falling and causing a dangerous accident. If the second traction belt 13 breaks, the counterweight 9 will only compress the elastic element 15 and be pulled by the first traction belt 12, preventing it from falling to the ground and causing a dangerous accident. Simultaneously, the equipment can still operate without affecting the task. Therefore, the solution in this embodiment achieves dual protection for the equipment through the arrangement of the first traction belt 12 and the second traction belt 13, resulting in higher reliability and greater practicality.

[0050] In this embodiment, the large-diameter outer circumference of the roller 2 is located in the middle, and the small-diameter outer circumference is located at both ends. There are two second traction belts 13. One end of each second traction belt 13 is connected to the small-diameter outer circumference at both ends of the roller 2, and the other end goes up around the guide wheel assembly 5 and is connected to both sides of the counterweight 9. This arrangement makes the force on the device more balanced and the operation of the device more stable and reliable.

[0051] It should also be noted that in this embodiment, the second traction belt 13 can also be a rope-like structure. When a rope-like structure is used, spiral grooves with opposite directions of rotation are provided on the two small-diameter outer circumferences of the roller 2, so that the second traction belt 13 of the rope-like structure is wound more evenly.

[0052] In this embodiment, the guide wheel assembly 5 includes a first guide wheel 501 and a second guide wheel 502. There are two first guide wheels 501, which are set on the left and right sides of the oil pumping tower 1 by support arms. The second guide wheels 502 are set on one side of the oil pumping tower 1 corresponding to the counterweight 9 by support arms and are located above the corresponding first guide wheel 501. Two sets of second guide wheels 502 are arranged at intervals along the front-back direction, with two in each set. The first traction belt 12 is wound around the roller 2 and the movable pulley 14 via two first guide wheels 501; the two second traction belts 13 are respectively connected to the counterweight 9 and the roller 2 via two sets of second guide wheels 502.

[0053] In a further embodiment, the pumping tower 1 is provided with a guide mechanism 7, which is used to guide the up-and-down sliding of the counterweight 9. Specifically, the guide structure includes a guide rod disposed on the pumping tower 1, the guide rod extending vertically, and a guide groove disposed on the counterweight 9. The guide rod and the guide groove slide together to guide the counterweight 9.

[0054] In a further embodiment, refer to Figure 8 The drive mechanism 10 includes a motor 1001, a reducer 1002, a coupling 1004, and a bearing housing 1003. The motor 1001, reducer 1002, and bearing housing 1003 are fixed relative to the pumping tower 1. Two bearing housings 1003 are spaced apart along the axial direction of the drum 2. The two ends of the drum 2 are supported by the two bearing housings 1003 respectively. The reducer 1002 is located outside the drum 2. The output end of the reducer 1002 is connected to the drum 2 through the coupling 1004. The output end of the motor 1001 is connected to the input end of the reducer 1002. The motor 1001 drives the drum 2 to rotate after the reducer 1002 reduces speed and increases torque, thereby traction of the counterweight 9 and the sucker rod.

[0055] In another embodiment, refer to Figure 9 The drive mechanism 10 can also be configured to include a motor 1001, a reducer 1002, and a bearing housing 1003. The motor 1001, reducer 1002, and bearing housing 1003 are fixed relative to the pumping tower 1. One end of the drum 2 is rotatably supported by the bearing housing 1003. The reducer 1002 is placed inside the drum 2, and its output end is connected to the other end of the drum 2. The output end of the motor 1001 is connected to the input end of the reducer 1002. The motor 1001 drives the drum 2 to rotate after the reducer 1002 reduces speed and increases torque, thereby achieving traction on the counterweight 9 and the sucker rod. By placing the reducer 1002 inside the drum 2, the volume and weight of the device can be greatly reduced, which is beneficial for achieving lightweight design.

[0056] Specifically, the oil pumping tower 1 includes a main frame 102 and a base 101. A support seat 103 is provided on the base 101, and the motor 1001, reducer 1002 and bearing seat 1003 are all provided on the support seat 103.

[0057] An electromagnetic brake is installed on motor 1001 for braking motor 1001.

[0058] In a further embodiment, an upper platform 3 is provided on the top of the pumping tower 1, and a guide wheel assembly 5 is provided on the upper platform 3.

[0059] Reference Figure 1 The platform 3 is surrounded by a fence 6 for safety protection.

[0060] In a further embodiment, the long-stroke tower pumping unit of the present invention also includes a control cabinet 11, which is used to operate the electrical control system.

[0061] In another embodiment, the flexible traction component can be configured to include only one traction belt. A movable pulley 14 is provided within the counterweight 9, and the roller 2 is configured with an outer circumference of uniform diameter. After the traction belt passes under the roller 2, one end passes over the guide wheel assembly 5 from above and connects to the sucker rod, while the other end passes over the guide wheel assembly 5 from above, passes over the movable pulley 14 from below, and is then fixed to the pumping tower 1. This embodiment, through the provision of the movable pulley 14, allows the sucker rod stroke to be twice the stroke of the counterweight 9, thereby achieving long-stroke oil extraction.

[0062] In another embodiment, based on Figure 2 In the illustrated scheme, the roller 2 is configured such that the diameter of its larger outer diameter is twice the diameter of its smaller outer diameter, and the fixed pulley is configured to be rotatably connected only to the counterweight 9. At this time, the winding length of the first traction belt 12 connected to the counterweight 9 is the same as that of the second traction belt 13. Thus, the stroke of the sucker rod is twice the stroke of the counterweight 9, achieving long-stroke oil extraction. Furthermore, if either the first traction belt 12 or the second traction belt 13 breaks, the counterweight 9 will not fall off, and even if the second traction belt 13 breaks, the device can still operate, providing dual protection for the device.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, combinations, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A long-stroke tower-type oil pumping unit, characterized in that, include: Oil pumping tower; A counterweight that can slide up and down on the oil pumping tower; The traction mechanism includes a roller, a flexible traction element, and a guide wheel assembly. The roller is rotatably mounted at the bottom of the pumping tower, and the guide wheel assembly is mounted at the top of the pumping tower. The flexible traction element is wound around the guide wheel assembly and the roller and pulls the counterweight and the sucker rod. The traction mechanism is configured such that when the roller rotates, the sucker rod and the counterweight move in opposite directions and the stroke of the sucker rod is greater than the stroke of the counterweight. The drive mechanism is configured to drive the drum to rotate. The flexible traction component includes a first traction belt and a second traction belt. The roller has a large-diameter outer periphery and a small-diameter outer periphery, and the diameter of the large-diameter outer periphery is greater than twice the diameter of the small-diameter outer periphery. The counterweight has a movable pulley inside, which can slide up and down relative to the counterweight. An elastic element is provided between the movable pulley and the counterweight, which makes the movable pulley initially at the lower limit position. The first traction belt is wrapped around the large diameter outer circumference of the drum from below. Then, one end of the belt goes up over the guide wheel assembly and is connected to the sucker rod, while the other end goes up over the guide wheel assembly, down over the movable pulley and is fixed to the oil pumping tower. One end of the second traction belt is connected to the small-diameter outer circumference of the roller, and the other end goes upward around the guide wheel assembly and is connected to the counterweight. One end of the first traction belt connected to the sucker rod and one end of the second traction belt connected to the drum are located on both sides of the drum, respectively; The large-diameter outer circumference of the roller is located in the middle, and the small-diameter outer circumference is located at both ends. There are two second traction belts. One end of each second traction belt is connected to the small-diameter outer circumference at both ends of the roller, and the other end goes up around the guide wheel assembly and is connected to both sides of the counterweight. Because the elastic element is easily compressed initially, the drive mechanism can more easily overcome the static friction of the pumping unit and drive the drum to rotate during the initial stage of the sucker rod descent. The drive mechanism starts more easily and smoothly. During the initial stage of the sucker rod rise, the elastic element releases its elastic force, and the drive mechanism can more easily overcome the static friction of the pumping unit and drive the drum to rotate. The drive mechanism starts more easily and smoothly as well. In summary, the design of the pulley and elastic element makes the pumping unit operate more stably and reliably.

2. The long-stroke tower-type pumping unit according to claim 1, characterized in that, The guide wheel assembly includes a first guide wheel and a second guide wheel. There are two first guide wheels, which are set on the left and right sides of the oil pumping tower by means of a support arm. The second guide wheel is set on one side of the corresponding counterweight block of the oil pumping tower by means of a support arm and is located above the corresponding first guide wheel. There are two sets of second guide wheels spaced apart in the front-back direction, with two in each set. The first traction belt is wound around the drum and the movable pulley via two first guide wheels; the two second traction belts are respectively connected to the counterweight and the drum via two sets of second guide wheels.

3. The long-stroke tower-type pumping unit according to claim 1, characterized in that, The oil pumping tower is equipped with a guiding mechanism, which is used to guide the counterweight block to slide up and down.

4. A long-stroke tower-type pumping unit according to claim 1, characterized in that, The drive mechanism includes a motor, a reducer, a coupling, and bearing housings. The motor, reducer, and bearing housings are fixed relative to the oil pumping tower. Two bearing housings are spaced apart along the axial direction of the drum. The two ends of the drum are supported by the two bearing housings respectively. The reducer is located outside the drum. The output end of the reducer is connected to the drum through a coupling. The output end of the motor is connected to the input end of the reducer.

5. A long-stroke tower-type pumping unit according to claim 1, characterized in that, The drive mechanism includes a motor, a reducer, and a bearing housing. The motor, reducer, and bearing housing are fixed relative to the oil pumping tower. One end of the drum is supported by the bearing housing. The reducer is placed inside the drum and its output end is connected to the other end of the drum. The output end of the motor is connected to the input end of the reducer.

6. A long-stroke tower-type pumping unit according to claim 4 or 5, characterized in that, The oil pumping tower consists of a main frame and a base. A support seat is installed on the base, and the motor, reducer and bearing housing are all installed on the support seat.

7. A long-stroke tower-type pumping unit according to claim 1, characterized in that, The top of the oil pumping tower is equipped with an upper platform, and the guide wheel assembly is located on the upper platform.

8. A long-stroke tower-type pumping unit according to claim 7, characterized in that, The platform is surrounded by a fence.

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