pumping unit

Abstract

This invention discloses an oil pumping unit, relating to the field of oil pumping unit technology. The oil pumping unit includes a base, a pulley assembly, multiple counterweights, a counterweight box device, an oil pumping device, and a control device. The counterweight box device includes a box body, a hanging assembly, and a drive assembly. The hanging assembly includes a lifting rod and a hook located at the lower end of the lifting rod and within the box body. The hook includes a hook portion extending along a first horizontal direction, with multiple hanging areas formed on the hook portion to correspond to the hanging holes for multiple counterweights. The lifting rod is movably mounted on the box body along the first horizontal direction. The oil pumping device is connected to the other end of a connecting cable via a weighing device. The control device is electrically connected to the weighing device and the drive assembly to control the displacement of the lifting rod in the first horizontal direction using the weighing data from the weighing device. The technical solution provided by this invention can improve the problem that existing oil pumping units cannot adaptively adjust the number of counterweights according to the load borne by the oil pumping device.

Description

Technical Field

[0001] This invention relates to the field of oil pumping unit technology, and particularly to an oil pumping unit. Background Technology

[0002] During the continuous extraction of oil from an oil well using a pumping unit, the suspension load borne by the pumping unit will continuously change dynamically, and the weight of the initially matched counterweight will gradually deviate from the optimal balance range. At present, the common way to adjust the counterweight on site is to use manual operation. This requires frequent disassembly and reassembly, and increasing or decreasing the number of counterweight blocks to change the overall balance weight. The whole operation requires the cooperation of multiple maintenance personnel. In addition, due to the large weight of the counterweight blocks and the complicated disassembly and locking process, coupled with the fact that the fixing bolts are prone to rust and jamming in the field environment, the operation difficulty and physical consumption are further increased. Therefore, there is an urgent need to design a counterweight adjustment structure for oil pumping units that can adapt to dynamic load fluctuations, eliminates the need for repeated manual additions and subtractions of counterweights, and significantly reduces the labor intensity of on-site operation and maintenance. Summary of the Invention

[0003] The main objective of this invention is to propose an oil pumping unit that aims to improve the problem that existing oil pumping units cannot adaptively adjust the number of counterweights according to the load borne by the oil pumping device.

[0004] To achieve the above objectives, the present invention provides an oil pumping unit comprising: The base has staggered placement areas and racks: The pulley assembly includes a pulley mounted on the frame and a connecting cable wound around the pulley in the middle; Multiple counterweights are arranged in the placement area along a first horizontal direction, and each counterweight has a lifting hole that extends through the first horizontal direction at its upper end. A counterweight box device includes a box body, a hanging assembly, and a drive assembly. The box body is connected to one end of a connecting cable. A clearance groove is provided through the bottom wall of the box body, and an opening communicating with the clearance groove is provided at the lower end of the side wall of the box body. The hanging assembly includes a hanging rod extending vertically and a hook located at the lower end of the hanging rod and inside the box body. The hook includes a hook portion extending in a first horizontal direction. The hook portion has multiple hanging areas along its length to correspond to the hanging holes of multiple counterweights. The hanging rod is movably installed in the box body in the first horizontal direction. During the stroke of the hanging rod, the hook portion can cooperate with the hanging holes on the counterweights. The drive assembly is drivenly connected to the hanging rod to drive the hanging rod to move in the first horizontal direction. An oil extraction device is connected to the other end of the connecting cable via a weighing device; A control device is electrically connected to the weighing device and the drive assembly to control the displacement of the boom in the first horizontal direction by the drive assembly based on the weighing data from the weighing device, so as to hook a corresponding number of the counterweights.

[0005] In one embodiment, the driving component includes: The first lead screw extends along the first horizontal direction and is rotatably mounted on the housing; A slider is installed on the first lead screw and is threadedly connected to the first lead screw; the slider is fixedly connected to the lifting rod. A first drive motor is installed in the housing and is driven by the first lead screw. The control device is electrically connected to the first drive motor and is used to control the displacement of the slider along the first horizontal direction.

[0006] In one embodiment, two sliders are spaced apart along a first horizontal direction; Two hanging assemblies are provided, and the hanging rods of the two hanging assemblies are respectively fixedly connected to one of the sliders.

[0007] In one embodiment, the first lead screw is provided with a first threaded section and a second threaded section at intervals along a first horizontal direction, and the first threaded section and the second threaded section are in opposite directions; The two sliders are respectively threadedly connected to the first threaded segment and the second threaded segment.

[0008] In one embodiment, two drive components are spaced apart along a second horizontal direction. Each slider is fixedly connected to a lifting rod, and a hook is provided at the lower end of each lifting rod. The two hooks corresponding in the second horizontal direction are used to lift the same counterweight.

[0009] In one embodiment, the hook includes a sleeve extending along a first horizontal direction and an extension rod disposed inside the sleeve. The extension rod is movably disposed along the first horizontal direction to have an extended position that can extend out of the sleeve and a retracted position that is located inside the sleeve in the movement path. In the extended position, the extension rod is capable of suspending the counterweight.

[0010] In one embodiment, a second lead screw is rotatably disposed inside the sleeve, and the second lead screw is threadedly connected to the extension rod to drive the extension rod to switch between the extended position and the retracted position.

[0011] In one embodiment, a second drive motor is further provided inside the sleeve for driving connection with the second lead screw; The control device is electrically connected to the second drive motor to control the displacement of the extension rod along the first horizontal direction.

[0012] In one embodiment, the mounting area includes a plurality of first mounting grooves located at the upper end of the sleeve and opening upwards; The inner side of the corresponding hanging hole is provided with a downward-facing mating protrusion, which can mate with the first hanging groove in the vertical direction.

[0013] In one embodiment, the upper end of the extension rod is provided with a plurality of upwardly opening second hanging grooves at intervals along a first direction, and the distance between two adjacent second hanging grooves is equal to the distance between two adjacent first hanging grooves. The inner side of the corresponding hanging hole is provided with a downward-facing mating protrusion, which can mate with the second hanging groove in the vertical direction.

[0014] In the technical solution of this invention, the weighing device can measure the load borne by the oil pumping unit, and the control device can control the displacement of the boom driven by the drive assembly in the first horizontal direction based on the weighing data of the weighing device, thereby adjusting the number of counterweights hooked by the hook, thus achieving adaptive adjustment of the counterweight. Specifically, when it is necessary to adjust the number of counterweights, the box can be controlled to move downward to the placement area corresponding to the counterweights. At this time, the height of the hook corresponds to the height of the lifting hole. When the drive assembly drives the boom to move in the first horizontal direction, the hook can be driven to move in the same direction, thus passing through the opening on its movement path. Based on the data of the weighing device obtained by the control device, the displacement of the hook is controlled, thereby controlling the number of counterweight lifting holes that the hook passes through in the hanging area, and cooperating with this, and then the hook is controlled to retract into the box to complete the adaptive adjustment of the number of counterweights. This improves the problem that existing oil pumping units cannot adaptively adjust the number of counterweights according to the load borne by the oil pumping unit. Attached Figure Description

[0015] 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 the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a structure of an embodiment of the oil pumping unit provided by the present invention; Figure 2 for Figure 1A front view schematic diagram of the working structure of the drive component and the suspension component; Figure 3 for Figure 2 A top-view structural diagram; Figure 4 for Figure 1 A schematic diagram of the arrangement of counterweights within the placement area.

[0017] Explanation of icon numbers: 100. Oil pumping unit; 1. Base; 2. Frame; 3. Pulley assembly; 4. Counterweight; 41. Lifting hole; 5. Counterweight box device; 51. Box body; 52. Hanging assembly; 521. Lifting rod; 522. Lifting hook; 522a. Hook; 53. Drive assembly; 531. First lead screw; 531a. First threaded section; 531b. Second threaded section; 532. Sliding block; 533. First drive motor; 6. Oil pumping device; 7. Weighing device; 8. Sleeve; 81. Hanging area; 811. First hanging groove.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] During the continuous extraction of oil from an oil well using a pumping unit, the suspension load borne by the pumping unit will continuously change dynamically, and the weight of the initially matched counterweight will gradually deviate from the optimal balance range. Currently, the common practice on-site is to adjust the counterweight manually. This requires frequent disassembly and reassembly, as well as increasing or decreasing the number of counterweight blocks to change the overall balance weight. The entire operation requires the cooperation of multiple maintenance personnel. In addition, the counterweight blocks are heavy, the disassembly and locking process is complicated, and the fixing bolts are prone to rust and jamming in the field environment, which further increases the difficulty of operation and physical exertion.

[0023] This invention proposes an oil pumping unit that aims to improve the problem that existing oil pumping units cannot adaptively adjust the number of counterweights according to the load borne by the oil pumping device.

[0024] Please see Figure 1 and Figure 4In one embodiment of the present invention, the oil pumping unit 100 includes a base 1, a pulley assembly 3, multiple counterweights 4, a counterweight box device 5, an oil pumping device 6, and a control device; wherein, the base 1 is provided with a staggered placement area and a frame 2; the pulley assembly 3 includes a pulley mounted on the frame 2 and a connecting cable wound around the pulley in the middle; multiple counterweights 4 are arranged in the placement area along a first horizontal direction, and each counterweight 4 has a lifting hole 41 extending through along the first horizontal direction at its upper end; the counterweight box device 5 includes a box body 51, a hanging assembly 52, and a drive assembly 53, the box body 51 is connected to one end of the connecting cable, the bottom wall of the box body 51 is provided with a clearance groove, and the lower end of the side wall of the box body 51 is provided with an opening communicating with the clearance groove; the hanging assembly 52 includes a hanging rod 521 extending vertically, and a rod 521 located at the lower end of the hanging rod 521 and situated in the box body 51. The lifting hook 522 within the housing 51 includes a hook portion 522a extending along a first horizontal direction. The hook portion 522a has multiple hanging areas 81 along its length, corresponding to the hanging holes 41 of multiple counterweights 4. A lifting rod 521 is movably mounted on the housing 51 along the first horizontal direction. During the stroke of the lifting rod 521, the hook portion 522a can engage with the hanging holes 41 on the counterweights 4. A drive assembly 53 is driven by the lifting rod 521 to drive its movement in the first horizontal direction. The oil extraction device 6 is connected to the other end of the connecting cable via a weighing device 7. The control device is electrically connected to the weighing device 7 and the drive assembly 53 to control the displacement of the lifting rod 521 in the first horizontal direction using the weighing data from the weighing device 7, thereby hooking a corresponding number of counterweights 4.

[0025] In the technical solution of the present invention, the weighing device 7 can measure the load borne by the oil extraction device 6, and the control device can control the displacement of the drive assembly 53 driving the lifting rod 521 to move in the first horizontal direction through the weighing data of the weighing device 7, thereby adjusting the number of counterweight blocks 4 hooked by the hook 522a, thereby realizing adaptive adjustment of the counterweight; specifically, when it is necessary to adjust the number of counterweight blocks 4, the box 51 can be controlled to move downward to the placement area corresponding to the placement of the counterweight blocks 4, at which time the height of the hook 522a and the height of the lifting hole 41 are... Correspondingly, when the drive assembly 53 drives the boom 521 to move along the first horizontal direction, the hook 522a can also be driven to move along the first horizontal direction, thus passing through the opening on its movement path. Based on the data from the weighing device 7 obtained by the control device, the displacement of the hook 522a is controlled, thereby controlling the number of lifting holes 41 of the counterweight 4 placed in the hanging area 81 through which the hook 522a passes, and cooperating with them. Then, the hook 522a is controlled to retract into the housing 51, thus completing the adaptive adjustment of the number of counterweights 4. This improves the problem that the existing pumping unit 100 cannot adaptively adjust the number of counterweights 4 according to the load borne by the pumping device 6.

[0026] It should be noted that in the above embodiments, the oil pumping device 6 is a series of structures that pump oil from the depth of the oil well to the surface, such as a sucker rod and an oil pump. Since the sucker rod bears almost all the load, the weighing device 7 is preferably used to measure the load borne by the sucker rod. In addition, since the hook 522a is used to hook the counterweight 4 from the placement area into the box 51, in order to prevent interference between the hook 522a and the box 51 during the process of hooking the counterweight 4 and moving the counterweight 4, the passage is provided at the lower end of the side wall of the box 51 to facilitate the extension of the hook 522a and the retraction of the hook 522a into the box 51 after hooking the counterweight 4. The clearance groove is also provided to avoid interference between the box 51 and the counterweight 4. As for the specific setting of the clearance groove, this application does not impose any restrictions. For example, the clearance groove can be provided through the area corresponding to the bottom wall of the box 51, or the box 51 can be set to a structure without the bottom wall. As for the specific setting of the passage, this application also does not impose any restrictions. For example, the passage can be set to an elongated hole corresponding to the size of the counterweight 4.

[0027] It should be noted that this application does not limit the specific configuration of the driver component 53; please refer to further details. Figure 2 and Figure 3In an embodiment of this application, the driving assembly 53 includes a first lead screw 531, a slider 532, and a first drive motor 533; the first lead screw 531 extends along a first horizontal direction and is rotatably mounted on the housing 51; the slider 532 is mounted on the first lead screw 531 and is threadedly connected to the first lead screw 531, and the slider 532 is fixedly connected to the lifting rod 521; the first drive motor 533 is mounted on the housing 51 and is drivenly connected to the first lead screw 531; the control device is electrically connected to the first drive motor 533 to control the displacement of the slider 532 along the first horizontal direction. In other words, by driving the first lead screw 531 to rotate via the first drive motor 533, the slider 532 slides on the first lead screw 531, thus realizing the movement of the slider 532 along the first horizontal direction. Since the slider 532 and the lifting rod 521 are fixedly connected, the lifting rod 521 can move along the first horizontal direction, thereby driving the hook 522a to move along the first horizontal direction. In addition, the control device is electrically connected to the first drive motor 533, so the number of rotations of the first lead screw 531 can be further controlled by controlling the number of rotations of the first drive motor 533, and finally the sliding displacement of the slider 532 can be controlled. Thus, the specific number of counterweights 4 hooked by the hook 522a can be precisely controlled.

[0028] In the embodiments of this application, two sliders 532 are spaced apart along the first horizontal direction; two hanging assemblies 52 are correspondingly provided, and the hanging rods 521 of the two hanging assemblies 52 are respectively fixedly connected to one of the sliders 532. That is, by providing two sliders 532 and two corresponding hanging assemblies 52, the rotation of one first lead screw 531 can simultaneously drive the movement of the two sliders 532 located above the first lead screw 531, thereby simultaneously controlling the movement of the two hooks 522a. Thus, while controlling the first drive motor 533 to rotate the same number of revolutions, the number of counterweights 4 can be doubled, improving the efficiency of adaptive adjustment.

[0029] In the above embodiments, the two hanging components 52 can be configured with the same or opposite directions of movement. Specifically, when the two hanging components 52 are configured with the same direction of movement, their movement paths may partially overlap, which may cause the latter hanging component 52 to fail to properly engage with the counterweight 4. Therefore, to solve this problem, in the embodiments of this application, the first lead screw 531 is provided with a first threaded section 531a and a second threaded section 531b spaced apart along a first horizontal direction, with the first threaded section 531a and the second threaded section 531b having opposite directions; the two sliders 532 are threadedly connected to the first threaded section 531a and the second threaded section 531b, respectively. In other words, by setting the two sliders 532 on the first threaded section 531a and the second threaded section 531b with opposite thread directions, the two sliders 532 move in opposite directions during the rotation of the first screw 531. For example, they can move towards each other or move away from each other. Specifically, when it is necessary to adjust the number of counterweights 4, the hooks 522a can be controlled to move away from each other, so that both hooks 522a extend out of the box 51. After cooperating with the corresponding counterweights 4, they move towards each other to hook the counterweights 4 into the box 51.

[0030] Since the counterweight 4 is typically heavy, the hook 522a needs to withstand significant pressure when engaging with the counterweight 4. When the hook 522a simultaneously hooks multiple counterweights 4, it may bend or even break. To mitigate this issue, in this embodiment, two drive components 53 are spaced apart along the second horizontal direction. Each slider 532 is fixedly connected to a lifting rod 521, and each lifting rod 521 has a hook 522 at its lower end. The two hooks 522 corresponding to each other in the second horizontal direction are used to lift the same counterweight 4. In this embodiment, by arranging two drive components 53 spaced apart in the second horizontal direction, and by providing hooks 522 on each drive component 53, it is possible to simultaneously drive two first drive motors 533, causing both first lead screws 531 to rotate simultaneously, thus synchronizing the movement of the two corresponding hooks 522 and enabling the simultaneous lifting of the same counterweight 4. On the one hand, by having two hooks 522 bear the weight simultaneously, it is ensured that a single hook 522a will not bear excessive pressure, which could lead to bending and breakage. On the other hand, by having two hooks 522 lift the counterweight 4 simultaneously, it is possible to ensure that the center of gravity of the counterweight 4 is in the middle during the movement, preventing the counterweight 4 from deflecting during the movement.

[0031] It should be noted that this application does not limit the specific shape of the hook 522a. For example, in an embodiment of this application, the hook 522a includes a sleeve 8 extending along a first horizontal direction and an extension rod (not shown) disposed inside the sleeve 8. The extension rod is movably arranged along the first horizontal direction, so as to have an extended position that can extend out of the sleeve 8 and a retracted position that is located inside the sleeve 8 in the movement path; in the extended position, the extension rod can lift the counterweight 4. In the solution of this embodiment, the hook 522a also includes a sleeve 8 and an extension rod, and the extension rod is movably arranged along the first horizontal direction, so that more counterweights 4 can be hung by extending the extension rod.

[0032] Regarding the specific driving method of the extension rod, this application does not impose additional restrictions. For example, in an embodiment of this application, a second lead screw (not shown) is rotatably disposed inside the sleeve 8. The second lead screw is threadedly connected to the extension rod to drive the extension rod to switch between the extended position and the retracted position. That is, the second lead screw and the extension rod together form a lead screw structure. By driving the rotation of the second lead screw, the extension rod can be driven to move linearly along the first horizontal direction. Thus, the horizontal displacement length of the extension rod can be controlled by controlling the number of rotations of the second lead screw.

[0033] Furthermore, the rotation of the second lead screw can be achieved manually, which is equivalent to adjusting the overall length of the hook 522a along the first horizontal direction without affecting the operating logic of the control device controlling the drive assembly 53. Additionally, the second lead screw can also be adjusted electrically. For example, in this embodiment, a second drive motor is provided inside the sleeve 8 for driving the second lead screw; the control device is electrically connected to the second drive motor to control the displacement of the extension rod along the first horizontal direction. In this embodiment, the second lead screw is driven by the second drive motor, and the control device is electrically connected to the second drive motor. Therefore, by using data from the weighing device 7 obtained by the control device, the extension length of the extension rod along the first horizontal direction can be adjusted, further controlling the number of counterweights 4 hooked.

[0034] It should be noted that the solution in this embodiment can be used in conjunction with the solutions in the above-mentioned multiple embodiments. For example, when two sliders 532 are provided on the first lead screw 531, the hooks 522a of the two corresponding hanging components 52 extend away from each other along the first horizontal direction. At this time, the extension directions of the two extension rods are also opposite. When the number of counterweights 4 to be hung is odd, one of the extension rods can be controlled by the control device to extend outward a certain distance to hang an additional counterweight 4 in that direction, thereby increasing the number of counterweights 4. If another counterweight 4 needs to be added, the other extension rod can be controlled to extend outward a certain distance to make the number of counterweights 4 on both sides equal, ensuring the stability of the center of gravity and reducing the number of counterweights 4 in the same way.

[0035] This application does not limit the specific structure of the hanging area 81. For example, in an embodiment of this application, the hanging area 81 includes a plurality of first hanging grooves 811 located at the upper end of the sleeve 8 and opening upwards; the inner side of the corresponding lifting hole 41 is provided with a downward-facing mating protrusion, which can mate with the first hanging grooves 811 in the vertical direction. By providing a plurality of upward-opening first hanging grooves 811 at the upper end of the sleeve 8, when the counterweight 4 is hooked, the first hanging grooves 811 and the mating protrusions provided on the inner side of the lifting hole 41 mate, thus ensuring a tight fit and preventing the counterweight 4 from shaking.

[0036] Furthermore, in the embodiments of this application, the upper end of the extension rod is provided with a plurality of upward-opening second hanging grooves (not shown) at intervals along the first direction, and the distance between two adjacent second hanging grooves is equal to the distance between two adjacent first hanging grooves 811; the inner side of the corresponding lifting hole 41 is provided with a downward-facing mating protrusion, which can mate with the second hanging groove in the vertical direction. That is to say, by providing a plurality of upward-opening second hanging grooves at the upper end of the extension rod, when hooking the counterweight 4, the second hanging grooves and the mating protrusion provided on the inner side of the lifting hole 41 mate; in addition, setting the distance between two adjacent second hanging grooves and the distance between two adjacent first hanging grooves 811 to be equal facilitates the control structure to control the extension length of the extension rod, and facilitates the setting of the position of the counterweight 4 horizontally arranged in the placement area along the first direction. It should be noted that the specific shape of the first hanging groove 811 and the second hanging groove is not limited in this application. For example, for the sake of uniformity, they can be set to the same or similar shapes.

[0037] The following is an exemplary embodiment of the oil pumping unit 100 proposed in this application: When it is necessary to adjust the number of counterweights 4, the housing 51 is first moved downward to the placement area corresponding to the placement of the counterweights 4, and the height of the hook 522a is controlled to correspond to the height of the lifting hole 41. At this time, the control device drives the first lead screw 531 to rotate a certain number of times according to the data of the weighing device 7, thereby adjusting the distance between the two sliders 532 on the first lead screw 531 and their moving positions. The sliding of the sliders 532 drives the hook 522a to move, thereby accurately controlling the displacement length of the hook 522a, and thus inserting the corresponding... The number of counterweights 4; if it is necessary to add a single counterweight 4 or the extension length of the sleeve 8 is already full of counterweights 4, and multiple additional counterweights 4 need to be added, the rotation of the second lead screw can be controlled by the control device. By precisely controlling the number of rotations of the second lead screw, the number of additional counterweights 4 that can be added on the extension rod on one side can be precisely controlled; then the first lead screw 531 is controlled to move in opposite directions, driving the hooked counterweights 4 back into the interior of the box 51. In this way, the control device adaptively adjusts the number of counterweights 4 according to the weighing data of the weighing device 7.

[0038] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An oil pumping unit, characterized in that, include: The base has staggered placement areas and racks: The pulley assembly includes a pulley mounted on the frame and a connecting cable wound around the pulley in the middle; Multiple counterweights are arranged in the placement area along a first horizontal direction, and each counterweight has a lifting hole that extends through the first horizontal direction at its upper end. A counterweight box device includes a box body, a hanging assembly, and a drive assembly. The box body is connected to one end of a connecting cable. A clearance groove is provided through the bottom wall of the box body, and an opening communicating with the clearance groove is provided at the lower end of the side wall of the box body. The hanging assembly includes a hanging rod extending vertically and a hook located at the lower end of the hanging rod and inside the box body. The hook includes a hook portion extending in a first horizontal direction. The hook portion has multiple hanging areas along its length to correspond to the hanging holes of multiple counterweights. The hanging rod is movably installed in the box body in the first horizontal direction. During the stroke of the hanging rod, the hook portion can cooperate with the hanging holes on the counterweights. The drive assembly is drivenly connected to the hanging rod to drive the hanging rod to move in the first horizontal direction. An oil extraction device is connected to the other end of the connecting cable via a weighing device; A control device is electrically connected to the weighing device and the drive assembly to control the displacement of the boom in the first horizontal direction by the drive assembly based on the weighing data from the weighing device, so as to hook a corresponding number of the counterweights.

2. The oil pumping unit as described in claim 1, characterized in that, The driving component includes: The first lead screw extends along the first horizontal direction and is rotatably mounted on the housing; A slider is installed on the first lead screw and is threadedly connected to the first lead screw; the slider is fixedly connected to the lifting rod. A first drive motor is installed in the housing and is driven by the first lead screw. The control device is electrically connected to the first drive motor and is used to control the displacement of the slider along the first horizontal direction.

3. The oil pumping unit as described in claim 2, characterized in that, Two sliders are spaced apart along the first horizontal direction; Two hanging assemblies are provided, and the hanging rods of the two hanging assemblies are respectively fixedly connected to one of the sliders.

4. The oil pumping unit as described in claim 3, characterized in that, The first lead screw is provided with a first threaded section and a second threaded section at intervals along a first horizontal direction, and the first threaded section and the second threaded section are in opposite directions. The two sliders are respectively threadedly connected to the first threaded segment and the second threaded segment.

5. The oil pumping unit as described in claim 4, characterized in that, Two drive components are spaced apart along the second horizontal direction. Each slider is fixedly connected to the lifting rod, and the lower end of each lifting rod is provided with a hook. The two hooks corresponding to each other in the second horizontal direction are used to lift the same counterweight.

6. The oil pumping unit as described in claim 1, characterized in that, The hook includes a sleeve extending along a first horizontal direction and an extension rod disposed inside the sleeve. The extension rod is movably disposed along the first horizontal direction so as to have an extended position that can extend out of the sleeve and a retracted position that is located inside the sleeve in the movement path. In the extended position, the extension rod is capable of suspending the counterweight.

7. The oil pumping unit as described in claim 6, characterized in that, A second lead screw is rotatably disposed inside the sleeve. The second lead screw is threadedly connected to the extension rod to drive the extension rod to switch between the extended position and the retracted position.

8. The oil pumping unit as described in claim 7, characterized in that, The sleeve is also equipped with a second drive motor for driving connection with the second lead screw; The control device is electrically connected to the second drive motor to control the displacement of the extension rod along the first horizontal direction.

9. The oil pumping unit as described in claim 6, characterized in that, The mounting area includes a plurality of first mounting grooves located at the upper end of the sleeve and opening upwards; The inner side of the corresponding hanging hole is provided with a downward-facing mating protrusion, which can mate with the first hanging groove in the vertical direction.

10. The oil pumping unit as described in claim 9, characterized in that, The upper end of the extension rod is provided with a plurality of upward-opening second hanging grooves at intervals along the first direction, and the distance between two adjacent second hanging grooves is equal to the distance between two adjacent first hanging grooves. The inner side of the corresponding hanging hole is provided with a downward-facing mating protrusion, which can mate with the second hanging groove in the vertical direction.

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