Electric control reversing device of tower type pumping unit and pumping unit

Abstract

The invention discloses a tower type pumping unit electric control reversing device and a pumping unit, and belongs to the technical field of petroleum geology oil and gas exploitation. An electric control reversing inductive switch is arranged at the longitudinal central axis of a pumping unit rack; the induction iron is arranged at the longitudinal center position of the balancing weight rail wheel, and it is always guaranteed that the induction iron and the balancing weight rail wheel are located in an effective induction range, so that the problem that the distance between the electric control reversing induction switch and the induction iron exceeds the maximum induction distance 2.5 cm due to the influence of strong wind is solved; the electric control reversing inductive switch cannot sense the induction iron and does not send a reversing instruction to the computer, and the motor drives the movable polish rod to run in one direction, run upwards to collide with the top of the tower type oil pumping unit for limiting or run downwards to collide with a wellhead, so that the actual problems that the oil pumping unit is out of position and shut down, and even more serious accidents occur due to wellhead piercing leakage are finally caused are solved. It can be guaranteed that the influence of wind power on field production can be effectively reduced for a single well with the electric control reversing inductive switch and the inductive iron within the range.

Description

Technical Field

[0001] This invention belongs to the field of petroleum geology and oil and gas extraction technology, specifically relating to an electrical control reversing device for a tower-type pumping unit and the pumping unit itself. Background Technology

[0002] Pumping units are the primary form of mechanical oil extraction in oilfield development. Evolving from the initial conventional beam pumping units to the current digital tower pumping units, the electrically controlled, induction-driven tower pumping units offer higher efficiency compared to traditional, purely mechanically crankshaft-commutated beam pumping units. Currently, the main type of pumping unit used in domestic oilfields is the electrically controlled, induction-driven tower pumping unit.

[0003] The structure of a tower-type oil pumping unit mainly consists of: control cabinet, foundation, main frame, limit switch assembly, electric induction switch, electric induction switch sensing iron, counterweight box, upper platform, drive wheel, motor and brake, guide wheel assembly, suspension rope device and belt, ladder and guardrail, etc.

[0004] During operation, tower-type pumping units utilize an electrically controlled reversing inductive switch in conjunction with its sensing iron to control the stroke of the pumping unit and the direction of motor rotation, thereby achieving reversing adjustment. The electrically controlled reversing inductive switch is a position switch that does not require direct mechanical contact with moving parts. When the sensing iron of the electrically controlled inductive switch approaches its sensing area, the switch issues an electrical command without contact, pressure, or sparks, accurately reflecting the position and stroke of the moving mechanism. Specifically, when the sensing iron of the pumping unit's electrically controlled inductive switch approaches the switch as the counterweight box moves upward or downward, the switch senses the iron and immediately sends a reversing command to the computer, thereby controlling the drive motor to rotate in the opposite direction, causing the counterweight box and sucker rod to move in the opposite direction. This reciprocating motion achieves the pumping process of the sucker rod moving up and down.

[0005] Electrically controlled commutation inductive switches come in various types, including eddy current, capacitive, Hall effect, and photoelectric. Currently, eddy current type electrically controlled commutation inductive switches are most commonly used in tower-type pumping units. These switches utilize the electromagnetic field generated when a conductive object approaches the switch, causing eddy currents within the object. These eddy currents react with the switch, changing its internal circuit parameters, thus detecting the presence or absence of a conductive object and controlling the switch's on / off state.

[0006] Currently, the design position of the electronically controlled reversing induction switch for tower-type pumping units is 10 cm offset from the longitudinal centerline of the pumping unit frame, with the sensing iron located at the midpoint of the corresponding counterweight. However, during long-term application, it has been found that the electronically controlled reversing device of a certain tower-type pumping unit frequently malfunctions due to strong winds. Observation of the distribution of the electronically controlled reversing induction switch and its sensing iron on the pumping unit frame and counterweight reveals that neither the switch nor the sensing iron is positioned on the centerline of the frame and counterweight. This leads to the technical problem of frequent malfunctions of the electronically controlled reversing device in tower-type pumping units under strong wind conditions. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a position structure for the electrical control reversing device of a tower-type pumping unit, so as to solve the technical problem that the electrical control reversing device of a tower-type pumping unit will frequently fail in high wind environments.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] An electrically controlled reversing device for a tower-type pumping unit includes an electrically controlled reversing inductive switch and an inductive iron. Both the electrically controlled reversing inductive switch and the inductive iron are mounted on the pumping unit frame, with the electrically controlled reversing inductive switch located at the longitudinal centerline of the pumping unit frame; the inductive iron is located at the longitudinal center of the counterweight track wheel.

[0010] Preferably, the electrically controlled reversing induction switch is located 1 to 2 centimeters along the longitudinal centerline of the pumping unit frame.

[0011] Preferably, the induction iron is an iron sheet 20 cm long and 10 cm wide.

[0012] A tower-type pumping unit includes the tower-type pumping unit electrical control reversing device described in any one of the above claims.

[0013] Preferably, it also includes a movable base frame, which is set on the foundation. The movable base frame is equipped with a pumping unit frame, and an upper platform is set on the top of the pumping unit frame. An electrical control unit and a transmission unit are set on the upper platform, and the electrical control unit and the transmission unit are connected to each other. A belt is also set on the transmission unit, and a counterweight box is connected to one end.

[0014] Preferably, the electronic control unit includes a control cabinet and a motor braking module; the control cabinet and the motor braking module are connected, and the motor braking module is connected to the transmission unit.

[0015] Preferably, the motor braking module includes a motor and a brake, which are connected to the control cabinet and to the transmission unit.

[0016] Preferably, the transmission unit includes a gear set and a pulley set; the pulley set is connected to the motor braking module and the drive wheel at the center of the gear set respectively; the gear set is provided with a guide wheel assembly; the guide wheel assembly is provided with a belt; one end of the belt is connected to the counterweight box through a counterweight rope; and the other end is connected to the suspension rope device.

[0017] Preferably, the pulley assembly is connected to the drive wheel at the center of the gear set via a chain.

[0018] Preferably, a counterweight suspension device is also provided between the counterweight rope and the counterweight box.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This application discloses an electrically controlled reversing device for a tower-type pumping unit. The electrically controlled reversing inductive switch is positioned at the longitudinal centerline of the pumping unit frame; the inductive iron is positioned at the longitudinal center of the counterweight track wheel, ensuring that both remain within the effective sensing range. This addresses the practical problem where strong winds cause the distance between the electrically controlled reversing inductive switch and its inductive iron to exceed the maximum sensing distance of 2.5 cm. In such cases, the inductive switch fails to sense the inductive iron and does not send a reversing command to the computer, causing the motor to drive the drive rod in one direction. This could result in the inductive switch hitting the top limit switch of the tower-type pumping unit upwards or hitting the wellhead downwards, ultimately leading to an over-range shutdown of the pumping unit and even more serious accidents such as wellhead leakage. This invention effectively reduces the impact of wind on on-site production in single wells where the electrically controlled reversing inductive switch and its inductive iron are within the specified range. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a tower-type oil pumping unit;

[0022] Figure 2 A top-view schematic diagram of the swaying of the counterweight box in an electrically controlled reversing tower-type pumping unit.

[0023] Figure 3 This is a schematic diagram of the original design of the electrically controlled reversing switch position structure;

[0024] Figure 4 A schematic diagram of the optimized electronically controlled commutator switch position structure;

[0025] Figure 5 This is a statistical comparison chart of the number of monthly shutdowns of the pumping unit before and after optimization in an embodiment of the present invention.

[0026] Wherein: 1-Foundation; 2-Pumping unit frame; 3-Counterweight box; 4-Suspension rope device; 5-Belt; 6-Guide wheel assembly; 7-Gear set; 8-Pulley assembly; 9-Motor and brake; 10-Control cabinet; 11-Upper platform; 12-Counterweight suspension rope; 13-Counterweight suspension rope device; 14-Mobile base frame; 15-Electrically controlled reversing induction switch; 16-Induction iron; 17-Counterweight block along the direction of induction iron swaying; 18-Counterweight block rotational swaying direction; 19-Counterweight block perpendicular to the direction of induction iron swaying. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings:

[0030] Having clarified the site conditions, we investigated the impact of horizontal and rotational swaying of the counterweight box 3 under wind power on the electrically controlled reversing induction switch. First, when the counterweight box 3 sways horizontally, there are two scenarios: The first is that the counterweight sways horizontally along the induction iron, causing horizontal displacement between the electrically controlled reversing induction switch and its induction iron. This horizontal displacement under wind power will not exceed the length of the induction iron, therefore it will not affect the normal operation of the pumping unit. The second scenario is that the counterweight box 3 sways perpendicular to the induction iron, causing vertical displacement between the electrically controlled reversing induction switch and its induction iron. In this case, the wind force needs to overcome more belt resistance, resulting in minimal vertical displacement; therefore, this scenario also will not affect the normal operation of the pumping unit. When the counterweight sways rotationally under wind power, the belt resistance overcome by the wind force is smaller. The rotational swaying causes the distance between the electrically controlled reversing induction switch and its induction iron to exceed the maximum sensing distance. The electrically controlled reversing induction switch fails to send a reversing command to the computer, ultimately leading to a pumping unit malfunction and shutdown. The above three swaying scenarios are as follows: Figure 2 As shown.

[0031] This invention proposes a new positional structure for an electrically controlled reversing device to address the practical problem that, due to strong winds, the distance between the electrically controlled reversing induction switch and its sensing iron exceeds the maximum sensing distance. Consequently, the electrically controlled reversing induction switch fails to sense its sensing iron and does not send a reversing command to the computer. This causes the motor to drive the optical rod in one direction, either upwards and hitting the top limit of the tower-type pumping unit or downwards and hitting the wellhead, ultimately leading to the pumping unit over-positioning and shutdown, or even causing wellhead leakage and more serious accidents.

[0032] The electronically controlled commutation device of a tower-type pumping unit consists of an electronically controlled commutation inductive switch and its sensing iron. During operation, the two work together to control the stroke of the pumping unit and the direction of motor rotation. Currently, eddy current type electronically controlled commutation inductive switches are widely used in tower-type pumping units. Within the maximum sensing distance, when a conductive object approaches the electronically controlled inductive switch that generates an electromagnetic field, eddy currents are generated inside the object. This eddy current reacts to the electronically controlled commutation inductive switch, causing changes in the internal circuit parameters of the switch, thereby detecting the presence or absence of a conductive object and controlling the switch to open or close. This type of electronically controlled commutation inductive switch can only detect conductive objects. In practice, to facilitate the induction between the electronically controlled commutation inductive switch and its sensing iron, the sensing iron is often a piece of iron 20 cm long and 10 cm wide.

[0033] This application discloses an electrically controlled reversing device for a tower-type pumping unit, including an electrically controlled reversing inductive switch 15 and an inductive iron 16. Both the electrically controlled reversing inductive switch 15 and the inductive iron 16 are mounted on the pumping unit frame 2, with the electrically controlled reversing inductive switch 15 positioned along the longitudinal central axis of the pumping unit frame 2. (See also...) Figure 4The induction iron 16 is positioned at the longitudinal center of the counterweight track wheel.

[0034] In some embodiments, the electrically controlled reversing induction switch 15 is located 1 to 2 centimeters along the longitudinal centerline of the pumping unit frame 2.

[0035] In some embodiments, the position of the electrically controlled commutation inductive switch and its sensing iron is optimized by offsetting the position of the electrically controlled commutation inductive switch by 10 cm from the longitudinal centerline of the pumping unit frame (see [reference]). Figure 3 The position of the sensing iron was changed from 1.5 cm to the longitudinal centerline of the pumping unit frame; the position of the sensing iron was changed from the counterweight block to the longitudinal center of the counterweight block track wheel to ensure that the position of the electronic reversing induction switch and its sensing iron are within the effective sensing range (2.5 cm), which can effectively reduce the impact of wind on on-site production.

[0036] This application also discloses a tower-type pumping unit, see [link to relevant documentation] Figure 1 The system includes the aforementioned tower-type pumping unit's electrical control reversing device, and also includes a movable base frame 14. The movable base frame 14 is mounted on the foundation 1, and the pumping unit frame 2 is mounted on the movable base frame 14. An upper platform 11 is mounted on the top of the pumping unit frame 2, and an electrical control unit and a transmission unit are mounted on the upper platform 11, which are interconnected. A belt 5 is also mounted on the transmission unit, with one end connected to a counterweight box 3. The electrical control unit drives the transmission unit, thereby transmitting power to the belt 5. One side of the belt is connected to the counterweight, and the other side is connected to the smooth rod. The counterweight moves up and down by the belt.

[0037] In some embodiments, the electronic control unit includes a control cabinet 10 and a motor braking module 9; the control cabinet 10 and the motor braking module 9 are connected, and the motor braking module 9 is connected to the transmission unit.

[0038] In some embodiments, the motor braking module 9 includes a motor and a brake, which are connected to the control cabinet 10 and to the transmission unit.

[0039] In some embodiments, the transmission unit includes a gear set 7 and a pulley set 8; the pulley set 8 is connected to the motor brake module 9 and the drive wheel at the center of the gear set 7 respectively; the gear set 7 is provided with a guide wheel assembly 6; the guide wheel assembly 6 is provided with a belt 5; one end of the belt 5 is connected to the counterweight box 3 through a counterweight suspension rope 12; and the other end is connected to the suspension rope device 4.

[0040] The pulley assembly 8 connects the motor and the drive wheel at the center of the gear assembly 7. The gear assembly 7 and the pulley assembly 8 are connected by a chain. The pulley assembly 8 transmits the motor power to the gear assembly 7 through the chain. A belt is connected to the gear assembly 7. One side of the belt is connected to the counterweight and the other side is connected to the smooth rod. The counterweight moves up and down by the belt.

[0041] In some embodiments, the pulley group 8 is connected to the drive wheel at the center of the gear group 7 via a chain.

[0042] In some embodiments, a counterweight suspension device 13 is also provided between the counterweight rope 12 and the counterweight box 3.

[0043]

Example 1

[0044] A tower-type pumping unit includes the aforementioned tower-type pumping unit electrical control reversing device, and also includes a movable base frame 14. The movable base frame 14 is mounted on a foundation 1, and a pumping unit frame 2 is mounted on the movable base frame 14. An upper platform 11 is mounted on the top of the pumping unit frame 2. An electrical control unit and a transmission unit are mounted on the upper platform 11, and the electrical control unit and the transmission unit are interconnected. A belt 5 is also mounted on the transmission unit, with one end connected to a counterweight box 3. The electrical control unit drives the transmission unit, thereby transmitting power to the belt 5. One side of the belt is connected to a counterweight block, and the other side is connected to a smooth rod. The counterweight block moves up and down by being driven by the belt.

[0045] The electrical control unit includes a control cabinet 10 and a motor braking module 9. The control cabinet 10 and the motor braking module 9 are connected, and the motor braking module 9 is connected to the transmission unit to transmit power to the transmission unit, and then to the belt 5. One side of the belt is connected to the counterweight and the other side is connected to the smooth rod. The counterweight moves up and down by the belt.

[0046]

Example 2

[0047] A tower-type pumping unit includes the aforementioned tower-type pumping unit electrical control reversing device, and also includes a movable base frame 14. The movable base frame 14 is mounted on a foundation 1, and a pumping unit frame 2 is mounted on the movable base frame 14. An upper platform 11 is mounted on the top of the pumping unit frame 2. An electrical control unit and a transmission unit are mounted on the upper platform 11, and the electrical control unit and the transmission unit are interconnected. A belt 5 is also mounted on the transmission unit, and a counterweight box 3 is connected to one end of the belt 5.

[0048] The electrical control unit includes a control cabinet 10 and a motor braking module 9; the control cabinet 10 and the motor braking module 9 are connected, and the motor braking module 9 is connected to the transmission unit.

[0049] Furthermore, the motor braking module 9 includes a motor and a brake, which are connected to the control cabinet 10 and the transmission unit. The motor power is transmitted to the transmission unit, which in turn transmits the power to the belt 5. One side of the belt is connected to the counterweight and the other side is connected to the guide rod. The counterweight moves up and down by the belt.

[0050]

Example 3

[0051] A tower-type pumping unit includes the aforementioned tower-type pumping unit electrical control reversing device, and also includes a movable base frame 14. The movable base frame 14 is mounted on a foundation 1, and a pumping unit frame 2 is mounted on the movable base frame 14. An upper platform 11 is mounted on the top of the pumping unit frame 2. An electrical control unit and a transmission unit are mounted on the upper platform 11, and the electrical control unit and the transmission unit are interconnected. A belt 5 is also mounted on the transmission unit, and a counterweight box 3 is connected to one end of the belt 5.

[0052] The electrical control unit includes a control cabinet 10 and a motor braking module 9; the control cabinet 10 and the motor braking module 9 are connected, and the motor braking module 9 is connected to the transmission unit.

[0053] Furthermore, the motor braking module 9 includes a motor and a brake, which are connected to the control cabinet 10 and the transmission unit. The motor power is transmitted to the transmission unit, which in turn transmits the power to the belt 5. One side of the belt is connected to the counterweight and the other side is connected to the guide rod. The counterweight moves up and down by the belt.

[0054] The transmission unit includes a gear set 7 and a pulley set 8; the pulley set 8 is connected to the motor brake module 9 and the drive wheel at the center of the gear set 7 respectively; the gear set 7 is provided with a guide wheel assembly 6; the guide wheel assembly 6 is provided with a belt 5; one end of the belt 5 is connected to the counterweight box 3 through the counterweight suspension rope 12; and the other end is connected to the suspension rope device 4.

[0055] The pulley assembly 8 connects the motor and the drive wheel at the center of the gear assembly 7. The gear assembly 7 and the pulley assembly 8 are connected by a chain. The pulley assembly 8 transmits the motor power to the gear assembly 7 through the chain. A belt is connected to the gear assembly 7. One side of the belt is connected to the counterweight and the other side is connected to the smooth rod. The counterweight moves up and down by the belt.

[0056]

Example 4

[0057] A tower-type pumping unit includes the aforementioned tower-type pumping unit electrical control reversing device, and also includes a movable base frame 14. The movable base frame 14 is mounted on a foundation 1, and a pumping unit frame 2 is mounted on the movable base frame 14. An upper platform 11 is mounted on the top of the pumping unit frame 2. An electrical control unit and a transmission unit are mounted on the upper platform 11, and the electrical control unit and the transmission unit are interconnected. A belt 5 is also mounted on the transmission unit, and a counterweight box 3 is connected to one end of the belt 5.

[0058] The electrical control unit includes a control cabinet 10 and a motor braking module 9; the control cabinet 10 and the motor braking module 9 are connected, and the motor braking module 9 is connected to the transmission unit.

[0059] Furthermore, the motor braking module 9 includes a motor and a brake, which are connected to the control cabinet 10 and the transmission unit. The motor power is transmitted to the transmission unit, which in turn transmits the power to the belt 5. One side of the belt is connected to the counterweight and the other side is connected to the guide rod. The counterweight moves up and down by the belt.

[0060] The transmission unit includes a gear set 7 and a pulley set 8; the pulley set 8 is connected to the motor brake module 9 and the drive wheel at the center of the gear set 7 respectively; the gear set 7 is provided with a guide wheel assembly 6; the guide wheel assembly 6 is provided with a belt 5; one end of the belt 5 is connected to the counterweight box 3 through the counterweight suspension rope 12; and the other end is connected to the suspension rope device 4.

[0061] The pulley assembly 8 connects the motor and the drive wheel at the center of the gear assembly 7. The gear assembly 7 and the pulley assembly 8 are connected by a chain. The pulley assembly 8 transmits the motor power to the gear assembly 7 through the chain. A belt is connected to the gear assembly 7. One side of the belt is connected to the counterweight and the other side is connected to the smooth rod. The counterweight moves up and down by the belt.

[0062] Following the optimization of the electrical control reversing inductive switch and its sensing iron position structure for the WDS380P8104-L pumping unit in July 2022, we tracked and analyzed the on-site operation of the pumping unit. Statistical data analysis revealed a significant reduction in the number of pumping unit shutdowns, an increase in single-well production time exceeding 2%, and a significant reduction in the time spent by personnel on troubleshooting. A comparison of the monthly shutdown statistics before and after optimization is provided below. Figure 5 The statistics for March to June are for pumping units using the original design of the electrically controlled reversing switch position structure, while the statistics for July to October are for pumping units using the optimized electrically controlled reversing switch position structure.

[0063] The electrically controlled reversing device of a tower-type pumping unit relies on an electrically controlled reversing inductive switch and its sensing iron to achieve reversing. In cases where strong winds cause the eddy current type electrically controlled reversing switch to fail to sense the electrical signal, adjustments to the position and structure of the reversing switch and its sensing iron are made based on the actual site conditions. The maximum sensing distance of the eddy current type electrically controlled inductive switch is generally around 2.5 cm. Ensuring that the position of the electrically controlled reversing inductive switch and its sensing iron within this range in a single well can effectively reduce the impact of wind on on-site production.

[0064] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An electrically controlled reversing device for a tower-type pumping unit, characterized in that, It includes an electrically controlled reversing induction switch (15) and an induction iron (16). Both the electrically controlled reversing induction switch (15) and the induction iron (16) are installed on the pumping unit frame (2), and the electrically controlled reversing induction switch (15) is installed at the longitudinal centerline of the pumping unit frame (2); the induction iron (16) is installed at the longitudinal center of the counterweight track wheel.

2. The electrically controlled reversing device for a tower-type pumping unit according to claim 1, characterized in that, The electrically controlled reversing induction switch (15) is located 1 to 2 centimeters along the longitudinal centerline of the pumping unit frame (2).

3. The electrically controlled reversing device for a tower-type pumping unit according to claim 1, characterized in that, The induction iron (16) is an iron sheet with a length of 20 cm and a width of 10 cm.

4. A tower-type oil pumping unit, characterized in that, Includes the electronically controlled reversing device for tower-type pumping units as described in any one of claims 1 to 3.

5. A tower-type pumping unit according to claim 4, characterized in that, It also includes a mobile base frame (14), which is set on the foundation (1). The mobile base frame (14) is equipped with a pumping unit frame (2), and the top of the pumping unit frame (2) is equipped with an upper platform (11). The upper platform (11) is equipped with an electrical control unit and a transmission unit, and the electrical control unit and the transmission unit are connected to each other. The transmission unit is also equipped with a belt (5), and one end is connected to a counterweight box (3).

6. A tower-type pumping unit according to claim 5, characterized in that, The electrical control unit includes a control cabinet (10) and a motor braking module (9); the control cabinet (10) and the motor braking module (9) are connected, and the motor braking module (9) is connected to the transmission unit.

7. A tower-type pumping unit according to claim 6, characterized in that, The motor braking module (9) includes a motor and a brake, which are connected to the control cabinet (10) and the transmission unit.

8. A tower-type pumping unit according to claim 5, characterized in that, The transmission unit includes a gear set (7) and a pulley set (8); the pulley set (8) is connected to the motor brake module (9) and the drive wheel at the center of the gear set (7) respectively. The gear set (7) is provided with a guide wheel assembly (6), and the guide wheel assembly (6) is provided with a belt (5). One end of the belt (5) is connected to the counterweight box (3) through the counterweight suspension rope (12), and the other end is connected to the suspension rope device (4).

9. A tower-type pumping unit according to claim 8, characterized in that, The pulley assembly (8) is connected to the drive wheel at the center of the gear assembly (7) via a chain.

10. A tower-type pumping unit according to claim 8, characterized in that, A counterweight suspension device (13) is also provided between the counterweight rope (12) and the counterweight box (3).

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