A swinging counterweight device for beam pumping units

Abstract

The present invention provides a swing counterweight device for a beam pumping unit, comprising a counterweight bracket installed at the rear end of a beam body, a ball screw and a driving device installed on the counterweight bracket, a force dividing mechanism locked to the ball screw, a swing mechanism mounted on the force dividing mechanism, and a controller for controlling the start / stop of the driving device. By installing the swing mechanism, the motion torque during the pumping stroke process can be balanced, so that the pumping movement of the pumping unit is smoother and the pumping efficiency is higher. When the downhole load increases, the controller controls the speed and direction of the driving device to drive the ball screw to rotate, thereby driving the force dividing mechanism and the swing mechanism to move laterally along the counterweight bracket to balance the changing torque, and finally achieve the balance of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield production equipment, and more particularly to a swing counterweight device for a beam pumping unit. Background Art

[0002] A pumping unit is a piece of oil extraction equipment widely used in oil fields. Its operating principle is to use a motor and a reducer to drive a donkey head mounted on the oil beam, causing it to reciprocate up and down, thereby pumping oil. However, with long-term operation, wax and minerals easily adhere to the downhole tubing walls, causing the pumping unit to become overloaded and difficult to maintain proper balance. During well flushing, the load on the pumping unit fluctuates due to changes in the downhole dynamic fluid level. Failure to promptly adjust the pumping unit's balance will affect the pumping effect.

[0003] In the prior art, a counterweight block 01 is usually installed at the tail of the walking beam, such as Figure 1 As shown, in order to balance the changing torque of the pumping unit during the pumping process, so as to achieve the balance of the pumping system. Figure 2 It can be seen that within a single stroke of the pumping unit, the torque of the counterweight at the end of the walking beam varies widely and forms a non-smooth curve. This indicates that installing counterweight 01 at the end of the walking beam does not provide a significant balancing effect. Furthermore, since the distance between counterweight 01 and the fulcrum is constant, once the bottomhole load changes, counterweight 01 cannot effectively balance the changing torque, thus affecting the operating efficiency of the pumping unit. Summary of the Invention

[0004] The purpose of the present invention is to provide a swing counterweight device for a walking beam pumping unit, which can effectively balance the changing torque within the pumping unit's operating stroke cycle and the changing torque generated by changes in external loads, thereby improving the system's stability and pumping efficiency, and is safe, energy-saving, and environmentally friendly.

[0005] The present invention provides a swinging counterweight device for a walking beam type oil pumping unit, comprising a counterweight bracket installed at the rear end of a walking beam body, a ball screw installed transversely on the counterweight bracket, a driving device for driving the ball screw to move, and a force distribution mechanism locked to the ball screw and capable of transverse linear movement along the counterweight bracket when the driving device drives the ball screw to rotate; a swing mechanism also comprising a swing mechanism mounted on the force distribution mechanism and capable of swinging by its own weight; and a controller for controlling the start / stop of the driving device.

[0006] Preferably, the counterweight bracket includes a first fixed plate installed at the tail end of the walking beam body, a second fixed plate arranged parallel to the first fixed plate, a guide rail vertically fixed between the first fixed plate and the second fixed plate for supporting the force distribution mechanism, and at least two connecting parts for connecting the guide rail and the first fixed plate; it also includes a reinforcing channel steel installed at the bottom of the guide rail.

[0007] Preferably, the force distribution mechanism includes two ball nuts that are relatively arranged and locked to the ball screw, and force distribution parts that are respectively fixed to the left and right end faces of the two ball nuts. The front end and rear end of the force distribution part are respectively provided with force distribution shafts. The force distribution shaft is a stepped shaft, including a first shaft section with a larger shaft diameter and a second shaft section with a relatively smaller shaft diameter. The first shaft section and the second shaft section are each installed with a first bearing and a second bearing. The two second bearings are each correspondingly fitted with a force distribution roller, and the two first bearings are each fitted with the swing link.

[0008] Preferably, the swing mechanism includes a pendulum and two swing links, and the pendulum and the swing links are connected via a connecting shaft.

[0009] Preferably, it further comprises two sets of anti-overtravel components symmetrically arranged along the central longitudinal vertical plane of the guide rail for preventing the force distribution mechanism from overtravel movement;

[0010] The anti-overtravel component includes an L-shaped connecting plate installed at the bottom end of the force distribution mechanism, and an induction switch and a drag cable installed on the inner side wall of the guide rail for connecting the guide rail and the L-shaped connecting plate.

[0011] Preferably, it further comprises four sets of limit switches installed on the side walls of the guide rail, wherein the four sets of limit switches are respectively fixed on the left and right ends of the front and rear side walls of the guide rail;

[0012] The limit switch includes a proximity switch for detecting the swing position of the swing mechanism and controlling the deceleration of the driving device, and a cut-off switch for connecting with the proximity switch and the driving device to control the driving device to stop.

[0013] Preferably, the guide rail is provided with two linear slides for respectively allowing the L-shaped connecting plate to move, and an anti-overtravel block is installed at the starting end and the ending end of the linear slide.

[0014] Preferably, the counterweight bracket is equipped with an automatic lubricator for automatically supplying oil to the ball screw.

[0015] Preferably, it further comprises a ground control cabinet connected to the controller and the automatic lubricator for performing ground control on the steering, start and stop of the drive device and the start and stop of the automatic lubricator.

[0016] Preferably, the ground control cabinet is provided with a motor on button, a motor off button, a lubricator on button, a lubricator off button and an LED indicator light.

[0017] Compared with the above background technology, the present invention provides a swing counterweight device for a walking beam pumping unit. By installing a swing mechanism at the tail end of the walking beam body, the swing mechanism swings freely with the operating stroke of the pumping unit under its own gravity during the pumping process. Figure 4 It can be seen from the torque change curve that within one movement cycle, the torque change curve is a smooth curve, and the torque change is small, which can make the oil pumping process more stable and efficient.

[0018] When impurities accumulate on the downhole tubing, the load on the pumping unit increases, activating the drive unit through the controller. This in turn drives the ball screw. Because the ball screw is locked to the force-sharing mechanism, and the swing mechanism is hoisted to the force-sharing mechanism, the ball screw converts rotational motion into linear motion of the force-sharing mechanism, driving the force-sharing mechanism and the swing mechanism along the counterweight support. Consequently, by adjusting the direction and speed of the drive unit through the controller, the direction and distance of the swing mechanism's movement can be adjusted, ultimately balancing the torque generated by the load change.

[0019] In summary, the swinging counterweight device for the walking beam pumping unit provided by the present invention can balance the changing torque within the pumping unit's operating stroke cycle. When the downhole load changes, it can also balance the changing torque generated by the load change, thereby ensuring the smooth and efficient operation of the pumping unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 It is a structural diagram of a midstream beam pumping unit in the prior art;

[0022] Figure 2 for Figure 1 The torque variation curve of the pumping unit in one stroke cycle;

[0023] Figure 3 This is a structural diagram of a beam pumping unit provided by the present invention and equipped with a swinging counterweight device;

[0024] Figure 4A curve diagram showing the torque variation of the swing counterweight device provided by the present invention within a stroke cycle;

[0025] Figure 5 for Figure 3 Schematic diagram of the structure of the swing-weight device;

[0026] Figure 6 for Figure 5 A structural diagram from another angle;

[0027] Figure 7 for Figure 5 Assembly diagram of the middle ball screw, force distribution mechanism, guide rail and second guide plate;

[0028] Figure 8 This is a schematic diagram of the assembly of the force distribution mechanism, guide plate, induction switch and drag cable;

[0029] Figure 9 for Figure 5 Schematic diagram of the structure of the central force component.

[0030] Among them, 1-swinging beam body, 2-counterweight bracket, 21-first fixed plate, 22-second fixed plate, 23-guide rail, 24-connecting piece, 25-reinforced channel steel, 3-ball screw, 4-ball nut, 5-force component, 51-force component shaft, 511-first shaft section, 512-second shaft section, 6-force component roller, 7-swing mechanism, 71-pendulum, 72-swing connecting rod, 73-connecting shaft, 8-L-shaped connecting plate, 9-induction switch and drag cable. DETAILED DESCRIPTION

[0031] The core of the present invention is to provide a swinging counterweight device for a walking beam pumping unit, which can achieve torque balance during the pumping process and balance the changing torque, thereby making the pumping process smoother and more efficient.

[0032] It should be noted that the directional words "up, down, left, right" appearing in this article refer to Figure 5 The up, down, left, and right directions in Figure 5 In the direction close to the paper, "back" refers to Figure 5 The directional words appearing in this document are based on the customary usage of those skilled in the art and the accompanying drawings, and their appearance shall not affect the scope of protection of the present invention.

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] Please refer to Figures 3 to 9 , Figure 3This is a structural diagram of a beam pumping unit provided by the present invention and equipped with a swinging counterweight device; Figure 4 A curve diagram showing the torque variation of the swing counterweight device provided by the present invention within a stroke cycle; Figure 5 for Figure 3 Schematic diagram of the structure of the swing-weight device; Figure 6 for Figure 5 A structural diagram from another angle; Figure 7 for Figure 5 Assembly diagram of the middle ball screw, force distribution mechanism, guide rail and second guide plate; Figure 8 This is a schematic diagram of the assembly of the force distribution mechanism, guide plate, induction switch and drag cable; Figure 9 for Figure 5 Schematic diagram of the structure of the central force component.

[0035] The present invention provides a swing counterweight device for a walking beam pumping unit, comprising a counterweight bracket 2, which is fixed to the tail end of a walking beam body 1 by means of bolts, nuts and other connectors. A ball screw 3 is mounted on the counterweight bracket 2, and the ball screw 3 is installed transversely along the extension direction of the counterweight bracket 2. Figure 5 A force dividing mechanism is mounted on the ball screw 3. Since the ball screw 3 is provided with an external thread and the force dividing mechanism is provided with an internal thread, the ball screw 3 and the force dividing mechanism are locked together by a thread.

[0036] The force distribution mechanism is mounted with a swing mechanism 7, which is fitted with a clearance to reduce friction between them. During the pumping process, the swing mechanism 7 can swing freely within the motion plane due to gravity. The free swinging motion of the swing mechanism 7 balances the kinetic torque of the pumping unit, making the operation of the pumping unit more stable. Figure 2 and Figure 4 It can be seen that compared with the existing technology, the torque difference of the present application is smaller. For the entire pumping unit system, the mechanical impact of the pumping unit system is smaller, the pumping process is smoother, and the pumping efficiency is higher.

[0037] In addition, a driving device, such as a reduction motor, is installed on the counterweight bracket 2. The reduction motor is connected to the ball screw 3 through a coupling. Driven by the driving device, the ball screw 3 converts the rotational motion into linear motion while rotating, and transmits it to the force component mechanism, so that the force component mechanism and its swing mechanism 7 move laterally along the counterweight bracket 2, thereby adjusting the position of the swing mechanism 7 relative to the counterweight bracket 2.

[0038] When objects such as wax and minerals adhere to the wall of the downhole oil pipe, the load on the donkey head at the head of the rocker body 1 increases, and the torque of the donkey head relative to the fulcrum increases accordingly. At this time, it is necessary to adjust the position of the swing mechanism 7 at the tail end of the rocker body 1 to balance the changing torque. By turning on the controller, the controller starts the drive device, and then drives the ball screw 3 to rotate. The ball screw 3 converts the rotational motion into linear motion, thereby driving the force distribution mechanism to move laterally along the counterweight bracket 2. Since the swing mechanism 7 is mounted on the force distribution mechanism, the force distribution mechanism moves and drives the swing mechanism 7 to move to the target position at the same time to balance the changing torque generated by the increase in load. The movement direction and running distance of the swing mechanism 7 can be achieved by adjusting the steering and speed of the drive device by the controller.

[0039] It can be seen that the swinging counterweight device for the walking beam pumping unit is configured by installing a swinging mechanism 7 at the tail end of the walking beam body 1. The swinging mechanism 7 swings freely with the swing of the pumping unit during the pumping process, thereby maintaining the torque of the system stable and improving the pumping efficiency.

[0040] The above-mentioned counterweight bracket 2 includes a first fixed plate 21, a second fixed plate 22, a guide rail 23 and a connecting member 24, wherein the first fixed plate 21 and the second fixed plate 22 are both plate-like structures and have sufficient strength and rigidity. The first fixed plate 21 and the second fixed plate 22 are both equipped with bearing seats, and bearings are installed in the seats. The first fixed plate 21 is fixed to the tail end of the walking beam body 1 by bolts and other connecting members. The second fixed plate 22 is arranged parallel to the first fixed plate 21. The guide rail 23 is preferably a channel steel, and the guide rail 23 is welded to the two inner side walls of the first fixed plate 21 and the second fixed plate 22. The above-mentioned guide rail 23 is used to bear the weight of the force distribution mechanism and the swing mechanism 7, and provide guidance for the linear motion of the force distribution mechanism.

[0041] In order to strengthen the guide rail 23, a reinforcing channel steel 25 can be installed at the bottom end of the guide rail 23. The setting of the reinforcing channel steel 25 can share part of the load applied to the guide rail 23, thereby improving the load-bearing strength of the guide rail 23 and extending the service life of the guide rail 23.

[0042] In order to increase the connection strength between the first fixed plate 21 and the guide rail 23, a connecting piece 24 can be installed on the front and rear side walls of the first fixed plate 21 and the guide rail 23. The first fixed plate 21, the connecting piece 24 and the guide rail 23 are welded or bolted together. The number of connecting pieces 24 can be set according to actual needs.

[0043] The swing mechanism 7 comprises a pendulum 71 and two swing links 72. The pendulum 71 is mounted at the lower ends of the two swing links 72, which are connected to the pendulum 71 via a connecting shaft 73. The upper ends of the two swing links 72 are provided with circular holes, through which the two swing links 72 are suspended from the force distribution mechanism. The swing links 72 and the force distribution mechanism are ensured to have a clearance fit, so that the pendulum 71 and the swing links 72 can freely swing.

[0044] like Figure 8 As shown, the force distribution mechanism comprises two ball nuts 4, a force distribution member 5, and a force distribution roller 6. The two ball nuts 4 are positioned opposite each other on the ball screw 3. Through threaded locking, the gap between the two ball nuts 4 and the ball screw 3 is minimized to reduce impact on the ball nuts 4 and the ball screw 3 during operation of the device and the pumping unit. The two ball nuts 4 are positioned face-to-face. The left and right sides of the force distribution member 5 are both flat. A circular through-hole is provided at the center of the force distribution member 5. The force distribution member 5 is fitted onto the ball nuts 4 through the circular through-hole. The two ball nuts 4 are mounted on the flat sides of the force distribution member 5.

[0045] The front and rear ends of the force component 5 are respectively fixed with a force component shaft 51, which is a stepped shaft, including a first shaft section 511 with a larger shaft diameter and a second shaft section 512 with a smaller shaft diameter relative to the first shaft section 511. The first shaft section 511 and the second shaft section 512 are respectively installed with a first bearing and a second bearing. The first bearing is fitted with a swing link 72, and the first bearing allows the swing link 72 to swing freely within an angle range of 60° as the pumping unit system operates; the second bearing is fitted with a force component roller 6, and the first bearing and the second bearing are both installed with elastic retaining rings to achieve axial limitation of the first bearing and the second bearing.

[0046] Since the swing link 72 is hung on the force component 5, and the force component 5 is installed on the guide rail 23 through the force component roller 6, the force component roller 6 transfers the weight of the pendulum 71 and the swing link 72 to the guide rail 23. In this way, the ball screw 3 only bears axial force, which can protect the ball screw 3 and extend the service life of the ball screw 3. For the entire pumping unit system, it plays the role of inertial buffering, reducing the mechanical impact on the entire pumping unit system.

[0047] In order to prevent dust and other impurities from falling into the driving device, a dust cover can be installed on the counterweight bracket 2. The dust cover is installed above the driving device. In this way, when the driving device is running, the dust cover can effectively block dust and other impurities, thereby playing a waterproof and dustproof role.

[0048] To prevent the force-sharing mechanism from overtravel, two sets of anti-overtravel assemblies can be installed on the force-sharing mechanism and guide rail 23. During installation, the two sets of anti-overtravel assemblies should be symmetrically arranged along the central longitudinal and vertical planes of the guide rail 23. Each set of anti-overtravel assemblies includes an L-shaped connecting plate 8, a sensor switch, and a drag cable 9. In one set of anti-overtravel assemblies, one end of the L-shaped connecting plate 8 is mounted on the bottom of the force-sharing mechanism, and the other end of the L-shaped connecting plate 8 is mounted on the inner side of the L-shaped connecting plate 8. The other end of the sensor switch and drag cable 9 is mounted on the inner side of the front wall of the guide rail 23. In the other set of L-shaped connecting plates 8, one end is mounted on the bottom of the force-sharing mechanism, and the other end is mounted on another sensor switch and drag cable 9. The other end of the sensor switch and drag cable 9 is mounted on the inner side of the rear wall of the guide rail 23. In this way, when the force-sharing mechanism moves, the sensor switch and drag cable 9 ensure that the force-sharing mechanism moves within a limited range, preventing overtravel.

[0049] In order to further prevent the force distribution mechanism from overtravel movement, a limit switch can be installed on the guide rail 23. Specifically, two groups of limit switches are installed on the front and rear side walls of the guide rail 23 respectively. The two groups of limit switches are respectively arranged at the left and right ends of the guide rail 23. Any group of limit switches includes a proximity switch and a cut-off switch. The proximity switch is used to detect the swing position of the swing mechanism 7 and control the drive device to decelerate. The cut-off switch is used to stop the drive device. That is, when the proximity switch detects that the swing mechanism 7 swings to a position close to the limit, the drive device is controlled to decelerate. When the cut-off switch detects that the swing mechanism 7 swings to the limit position, the drive device stops working.

[0050] It can be seen that the dual limiting method of mechanical limiting and electrical control limiting is used to ensure that the pendulum 71 moves within a predetermined range. By adjusting the installation position of the induction switch and the drag cable 9, as well as the installation position of the limit switch, the movement range of the pendulum 71 can be adjusted.

[0051] To ensure smooth operation of the force distribution mechanism, a linear slideway can be installed on the guide rail 23 for the linear sliding of the L-shaped connecting plate 8. The linear slideway provides guidance, ensuring smooth linear movement of the force distribution mechanism. Furthermore, anti-overtravel blocks can be installed at the starting and ending ends of the linear slideway. The anti-overtravel blocks are attached to the linear slideway using bolts or other fasteners to prevent overtravel of the L-shaped connecting plate 8.

[0052] In order to achieve automatic lubrication of the ball screw 3, an automatic lubricator can be installed on the counterweight bracket 2. The automatic lubricator is arranged above the ball screw 3. Since the automatic lubricator has the function of supplying lubricating oil in a timely and quantitative manner, a timer, a valve and a control circuit are provided inside it. The timer is used to store the sleep time and working time, and the control circuit is used to open and close the valve. After the sleep time is reached, the control circuit automatically controls the valve to open and lubricate the ball screw 3; when the lubrication reaches the set working time, the control circuit automatically closes the valve. In this way, automatic lubrication of the ball screw 3 can be achieved.

[0053] To remotely control the drive unit and automatic lubricator, a ground control cabinet can be installed on the ground. This cabinet is wirelessly connected to the controller and automatic lubricator. From this cabinet, workers can control the start, stop, and direction of the controller, as well as the start and stop of the automatic lubricator, making it safer and more convenient.

[0054] Specifically, the ground control cabinet features a motor on / off button, a lubricator on / off button, a lubricator off / on button, and a power-on / off status indicator. A wireless transceiver is housed within the ground control cabinet, connected to the motor on / off button via wires. The controller has wireless transceiver functionality. When a worker presses the motor on / off button, the on / off command is transmitted to the controller via the wireless transceiver, which then starts and stops the drive unit. Similarly, the automatic lubricator has signal transceiver functionality. When a worker presses the lubricator on / off button, the wireless transceiver activates and deactivates the automatic lubricator, enabling remote control of the lubricator.

[0055] The ground control cabinet is also equipped with an LED indicator light to display the motor power on / off status. If it is always on, it means the device is in the on state, and if it is off, it means the device is in the standby state. In this way, the staff can know the power on / off status of the drive device through the indication of the LED indicator light, realizing the visual operation of the power on / off process.

[0056] The above describes in detail the swinging counterweight device for a beam pumping unit provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A swing counterweight device for a beam pumping unit, characterized in that: It comprises a counterweight bracket (2) mounted on the rear end of a walking beam body (1), a ball screw (3) mounted transversely on the counterweight bracket (2), a driving device for driving the ball screw (3) to move, and a force distribution mechanism locked to the ball screw (3) and capable of transverse linear movement along the counterweight bracket (2) when the driving device drives the ball screw (3) to rotate; it also comprises a swing mechanism (7) mounted on the force distribution mechanism and capable of swinging by its own weight; and it also comprises a controller for controlling the start / stop of the driving device; The counterweight bracket (2) comprises a first fixing plate (21) mounted on the rear end of the walking beam body (1), a second fixing plate (22) arranged parallel to the first fixing plate (21), a guide rail (23) vertically fixed between the first fixing plate (21) and the second fixing plate (22) for supporting the force distribution mechanism, and at least two connecting members (24) for connecting the guide rail (23) and the first fixing plate (21); and further comprises a reinforcing channel steel (25) mounted on the bottom of the guide rail (23); The force distribution mechanism comprises two ball screw nuts (4) arranged opposite to each other and locked to the ball screw (3), and a force distribution member (5) respectively fixed to the left and right end surfaces of the two ball screw nuts (4), the front end and the rear end of the force distribution member (5) are respectively provided with a force distribution shaft (51), the force distribution shaft (51) is a stepped shaft, comprising a first shaft section (511) with a larger shaft diameter and a second shaft section (512) with a relatively smaller shaft diameter, the first shaft section (511) and the second shaft section (512) are respectively correspondingly fitted with a first bearing and a second bearing, the two second bearings are respectively fitted with a force distribution roller (6), and the two first bearings are respectively fitted with the swing mechanism (7); It also includes two groups of anti-overtravel components which are symmetrically arranged along the central longitudinal vertical plane of the guide rail (23) and are used to prevent the force distribution mechanism from overtravel movement; It also includes four groups of limit switches installed on the side walls of the guide rail (23), and the four groups of limit switches are respectively fixed to the left and right ends of the front and rear side walls of the guide rail (23).

2. The swing counterweight device for a beam pumping unit according to claim 1, characterized in that: The swing mechanism (7) comprises a pendulum (71) and two swing connecting rods (72), and the pendulum (71) and the swing connecting rods (72) are connected via a connecting shaft (73).

3. The swing counterweight device for a beam pumping unit according to any one of claims 1 to 2, characterized in that: The anti-overtravel assembly comprises an L-shaped connecting plate (8) mounted on the bottom end of the force distribution mechanism, and an induction switch and a drag cable (9) mounted on the inner side wall of the guide rail (23) and used to connect the guide rail (23) and the L-shaped connecting plate (8).

4. The swing counterweight device for a beam pumping unit according to any one of claims 1 to 2, characterized in that: The limit switch comprises a proximity switch for detecting the swing position of the swing mechanism (7) and controlling the drive device to decelerate, and a cut-off switch for connecting the proximity switch and the drive device to control the drive device to stop.

5. The swing counterweight device for a beam pumping unit according to claim 3, characterized in that: The guide rail (23) is provided with two linear slide grooves for respectively allowing the L-shaped connecting plate (8) to move, and an anti-overtravel block is respectively installed at the starting end and the ending end of the linear slide groove.

6. The swing-weight device for a beam pumping unit according to claim 5, characterized in that: The counterweight bracket (2) is equipped with an automatic lubricator for automatically supplying oil to the ball screw (3).

7. The swing counterweight device for a beam pumping unit according to claim 6, characterized in that: It also includes a ground control cabinet connected to the controller and the automatic lubricator for performing ground control on the steering, start and stop of the drive device and the start and stop of the automatic lubricator.

8. The swing-weight device for a beam pumping unit according to claim 7, characterized in that: The ground control cabinet is provided with a motor start button, a motor stop button, a lubricator start button, a lubricator stop button and an LED indicator light.

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