CN110700797B - Self-adaptive counterweight structure of beam-pumping unit - Google Patents

Self-adaptive counterweight structure of beam-pumping unit Download PDF

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Publication number
CN110700797B
CN110700797B CN201910923269.XA CN201910923269A CN110700797B CN 110700797 B CN110700797 B CN 110700797B CN 201910923269 A CN201910923269 A CN 201910923269A CN 110700797 B CN110700797 B CN 110700797B
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China
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weight
counterweight
horse head
top end
balance weight
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CN201910923269.XA
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CN110700797A (en
Inventor
刘翠霞
庄立君
李任
杨雷
张艳杰
戴海辉
李石磊
梁丽
钟彬伟
陈娜
张海鹏
孙雨飞
李雪梅
王立臣
宋晶鑫
刘洪俊
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刘翠霞
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Priority to CN201910923269.XA priority Critical patent/CN110700797B/en
Publication of CN110700797A publication Critical patent/CN110700797A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121Lifting well fluids
    • E21B43/126Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
    • E21B43/127Adaptations of walking-beam pump systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/14Counterbalancing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/28Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same

Abstract

The invention discloses a self-adaptive counterweight structure of a beam-pumping unit, and particularly relates to the field of counterweight structures. According to the invention, the counterweight device and the counterweight block are arranged, the convenience that the counterweight block can be singly increased or decreased is utilized, when the counterweight device needs to be installed on the surfaces of beam-pumping units of different models and sizes, operators can increase or decrease the counterweight block according to the specific conditions on site, so that the weight of the counterweight device is matched with the weight of a horse head, the condition that a rotating motor is overloaded is avoided, and the practicability of the device is increased.

Description

Self-adaptive counterweight structure of beam-pumping unit
Technical Field
The invention relates to the technical field of counterweight structures, in particular to a self-adaptive counterweight structure of a beam-pumping unit.
Background
The beam pumping unit, also called beam pumping unit, beam crank balanced pumping unit, refers to the pumping unit which contains beam, and is reversed by link mechanism, and balanced by crank weight, commonly called head-knocking machine, and is a rod type oil extraction equipment from oil extraction mode, and can be divided into two types from oil extraction mode, i.e. rod type oil extraction equipment and rodless type oil extraction equipment. Gradient-based algorithms are commonly used, wherein the minimum mean square error algorithm is particularly common, and the counterweight is a heavy object used for balancing a certain moving part of a machine, such as the balance of a tower crane.
However, in practical use, there still exist some disadvantages, such as:
(1) the utility model discloses a device for improving the safety of a walking beam pumping unit, including a transmission motor, a horsehead, a counterweight structure, a counterweight, a horsehead, a counterweight, a motor, a transmission motor, a motor shaft, a transmission motor, a counterweight structure, a transmission motor and a transmission motor, wherein the counterweight structure is arranged on the horsehead, the counterweight structure is arranged on the upper portion of the transmission motor shaft, the counterweight structure is arranged on the lower portion of the transmission motor shaft, the transmission motor shaft is arranged on the lower portion, the transmission motor shaft is arranged on the lower portion, the transmission motor shaft is arranged on the lower portion, the transmission motor shaft is arranged on the lower portion, the transmission motor shaft is arranged on the transmission motor shaft, the lower portion, the transmission motor shaft is arranged on the lower portion, the transmission motor shaft is arranged on the lower portion, and is arranged on the lower portion, the transmission motor is arranged on the lower portion, the transmission motor shaft is arranged on the lower portion, the transmission motor is arranged on the transmission motor shaft is arranged on the transmission motor shaft, the lower portion, and is arranged on the lower portion, the transmission mechanism is arranged on the lower portion, and is arranged on the lower portion, and is arranged on the transmission motor is arranged on the lower portion, the transmission motor shaft is arranged on the lower portion, and is.
(2) When the device is used, because the weight of the horse head can not be flexibly adjusted according to the size of a well mouth, the limitation of the device is lower, when the well mouth is different from the opposite surface of the beam pumping unit, the device can not adjust the different well mouths, the limitation of the device is larger, the economic benefit of the device is reduced, and the practicability of the device is low.
(3) The oil well oil taking operation is completed by the conventional device in the up-down lifting mode, and the weight of the horsehead and the counterweight structure can not be adjusted in different sizes in the face of different models of different beam pumping units, so that the friction force between the traveling frame and the supporting device is large, the abrasion between the traveling frame and the supporting device is increased, the service life between components of the device is shortened, and the practicability of the device is not facilitated.
Therefore, a self-adaptive counterweight structure of a beam pumping unit, which can freely adjust the weight and has less abrasion, is needed.
Disclosure of Invention
In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide an adaptive counterweight structure of a beam-pumping unit, which utilizes the convenience of individually increasing and decreasing counterweight blocks by arranging a counterweight device and counterweight blocks, when the counterweight device needs to be installed on the surfaces of beam-pumping units of different models and sizes, an operator can increase or decrease the counterweight blocks according to the specific situation on site, so that the weight of the counterweight device is adapted to the weight of a horse head, thereby avoiding the overload situation of a rotating motor, and by arranging a structure formed by fixedly installing six counterweight blocks on the horse head, so that the horse head can adjust the weight of the horse head according to the depth and diameter of an oil well when facing oil well mouths of different sizes, thereby increasing the practicability of the device and improving the matching performance among various components of the device, to solve the problems set forth in the background art described above.
In order to achieve the purpose, the invention provides the following technical scheme: a self-adaptive counterweight structure of a beam-pumping unit comprises a ground, wherein a bottom plate is fixedly mounted at the top end of the ground, a support frame is fixedly mounted at the top end of the bottom plate, a fixed block is integrally formed at the top end of the support frame, a fixing device is welded at the top end of the fixed block, a traveling block is movably mounted on the surface of the fixing device, a horse head is fixedly mounted at the left end of the traveling block, a first fixed hole is formed in the top end of the surface of the horse head, a second fixed hole is formed in the bottom end surface of the horse head, a connecting rope is fixedly mounted on the surface of the horse head, an oil pumping device is connected to the bottom end of the connecting rope in a friction mode, an oil well groove is formed in the surface of the ground, an oil well mouth is formed in the ground, a fixed plate is fixedly mounted at the bottom end of the traveling block, rivets are fixedly mounted on the surface of the fixed plate, and a connecting rod is movably mounted on the surface of the fixed plate, a crank is movably mounted at the other end of the connecting rod, a rotating rod is movably mounted at the other end of the crank, a rotating motor is fixedly mounted at the other end of the rotating rod, and a motor protective cover is connected to the surface of the rotating motor in a friction mode;
the bottom fixed mounting of swimming frame has the counter weight device, the inside friction link of counter weight device has the balancing weight, the notch has been seted up on the surface of counter weight device, the screw rod is installed to the top screw thread of horse head, the nut is installed to the bottom screw thread of screw rod, fixing bolt is installed to the surface screw thread of notch, fixing bolt's right side an organic whole is formed with the connecting block.
In a preferred embodiment, the height of the supporting frame is eight meters to ten meters, and the supporting frame is made of a metal component.
In a preferred embodiment, the length of the said balance frame is fifteen meters to twenty meters, and there is a central position of the balance frame movably mounted with the fixing device.
In a preferred embodiment, the horse head comprises a first weight, the top end of the first weight is frictionally connected with a second weight, the top end of the second weight is frictionally connected with a third weight, the top end of the third weight is frictionally connected with a fourth weight, the top end of the fourth weight is frictionally connected with a fifth weight, and the top end of the fifth weight is frictionally connected with a sixth weight.
In a preferred embodiment, the horse head is directly above the oil well tank.
In a preferred embodiment, the number of the counter weight blocks is five, five counter weight blocks are in one-time friction connection in a surface groove of the counter weight device, and the single weight of each counter weight block is two hundred kilograms.
In a preferred embodiment, the surface of the notch is threaded.
The invention has the technical effects and advantages that:
1. according to the invention, the counterweight device and the counterweight block are arranged, the convenience that the counterweight block can be singly increased or decreased is utilized, when the counterweight device needs to be installed on the surfaces of beam-pumping units of different models and sizes, an operator can increase or decrease the counterweight block according to the specific conditions on site, so that the weight of the counterweight device is matched with the weight of a horse head, the condition of overload of a rotating motor is avoided, the practicability of the device is increased, the safety degree of the device is improved, the matching performance of each component of the device during working is greatly increased, and other accidents such as faults generated by overload of the motor are avoided.
2. According to the invention, the structure formed by fixedly mounting six balance blocks on the mule head is arranged, so that when the mule head faces oil well mouths with different sizes, the weight of the mule head can be adjusted according to the depth and the diameter of an oil well, the practicability of the device is increased, the matching property between components of the device is improved, the problem that the wear rate generated between a travelling frame and a supporting device is overhigh when the device works due to the fact that the weight of the mule head is different from the weight required by an oil well mouth for oil extraction is solved, the service life between the travelling frame and the supporting device is prolonged, the economic benefit and the practicability of the device are increased, and the comprehensiveness of the device is increased.
3. According to the invention, the weight of the balance weight device and the horse head can be adjusted, so that when the device works and faces oil wells of different types, the weight of the balance weight device and the horse head can be changed, the friction force between the travelling frame and the supporting device is reduced to the minimum, the service life of the travelling frame of the device is prolonged, and the practicability of the device is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the horse head structure of the present invention.
Fig. 3 is an enlarged schematic view of the structure at a in fig. 1 according to the present invention.
Fig. 4 is an enlarged schematic view of fig. 1 at B according to the present invention.
Fig. 5 is a schematic structural diagram of a counterweight device according to the present invention.
Fig. 6 is a schematic view of the horse head structure of the present invention.
FIG. 7 is a schematic view of the structure of the swimming frame of the present invention
The reference signs are: 1. a ground surface; 2. a base plate; 3. a support frame; 4. a fixed block; 5. a fixing device; 6. a traveling frame; 7. a donkey head; 71. a first weight; 72. a second weight; 73. a third counterweight; 74. a fourth weight; 75. a fifth balance weight; 76. a sixth weight; 8. a first fixing hole; 9. a second fixing hole; 10. connecting ropes; 11. an oil pumping device; 12. an oil well tank; 13. a fixing plate; 14. riveting; 15. a connecting rod; 16. a crank; 17. rotating the rod; 18. rotating the motor; 19. a motor protection cover; 20. a counterweight device; 21. a balancing weight; 22. a notch; 23. a screw; 24. a nut; 25. fixing the bolt; 26. connecting blocks; 27. the oil wellhead.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The self-adaptive counterweight structure of the walking beam type pumping unit as shown in the attached drawings 1-7 comprises a ground 1, a bottom plate 2 is fixedly installed at the top end of the ground 1, a supporting frame 3 is fixedly installed at the top end of the bottom plate 2, a fixing block 4 is integrally formed at the top end of the supporting frame 3, a fixing device 5 is welded at the top end of the fixing block 4, a traveling block 6 is movably installed on the surface of the fixing device 5, a horse head 7 is fixedly installed at the left end of the traveling block 6, a first fixing hole 8 is formed at the top end of the surface of the horse head 7, a second fixing hole 9 is formed at the bottom end surface of the horse head 7, a connecting rope 10 is fixedly installed on the surface of the horse head 7, an oil pumping device 11 is connected to the bottom end of the connecting rope 10 in a friction mode, an oil well groove 12 is formed in the surface of the ground 1, an oil well mouth 27 is formed in the ground 1, and a fixing plate 13 is fixedly installed at the bottom end of the traveling block 6, the surface of the fixing plate 13 is fixedly provided with a rivet 14, the surface of the fixing plate 13 is movably provided with a connecting rod 15, the other end of the connecting rod 15 is movably provided with a crank 16, the other end of the crank 16 is movably provided with a rotating rod 17, the other end of the rotating rod 17 is fixedly provided with a rotating motor 18, the rotating motor 18 and the surface of the rotating motor 18 are connected with a motor protective cover 19 in a friction mode;
the bottom end of the said balance frame 6 is fixedly equipped with a counterweight device 20, the inner friction link of the said counterweight device 20 is connected with a counterweight 21, the surface of the weight device 20 is provided with a notch 22, the top end of the horse head 7 is provided with a screw 23 in a threaded manner, a nut 24 is installed at the bottom end of the screw rod 23 in a threaded manner, a fixing bolt 25 is installed on the surface of the notch 22 in a threaded manner, a connecting block 26 is integrally formed at the right side of the fixing bolt 25, the height of the supporting frame 3 is eight to ten meters, the supporting frame 3 is made of metal components, the horse head 7 is positioned right above the oil well groove 12, the motor protective cover 19 is box-shaped, the motor protective cover 19 is made of metal components, the number of the counter weight blocks 21 is five, the five counter weight blocks 21 are in one-time friction connection in the surface notch 22 of the counter weight device 20, and the single weight of the counter weight block 21 is two hundred jin.
Referring specifically to fig. 2 of the specification, the horse head 7 includes a first weight 71, a second weight 72 is frictionally connected to a top end of the first weight 71, a third weight 73 is frictionally connected to a top end of the second weight 72, a fourth weight 74 is frictionally connected to a top end of the third weight 73, a fifth weight 75 is frictionally connected to a top end of the fourth weight 74, and a sixth weight 76 is frictionally connected to a top end of the fifth weight 75.
The implementation mode is specifically as follows: the structural arrangement of the horse head 7 is utilized, so that an operator only needs to increase or decrease the quantity of the first balance block 71, the second balance block 72 and the third balance block 73 to adjust the weight of the device, the practicability of the device is increased, the adaptability among all components of the device is improved, the wear rate among all the components of the device is reduced, and the practicability and the convenience of the device are improved.
With particular reference to the description of fig. 5, the surface of the notch 22 is threaded.
The implementation mode is specifically as follows: the screw thread on the surface of the notch 22 is utilized, the notch 22 and the fixing bolt 25 are fixedly installed together through threaded connection, the fixing performance between the notch 22 and the fixing bolt 25 is greatly increased, the stability of the device is improved, the safety of the device is improved, the accident that the fixing bolt 25 of the device slides down from the notch 22 is avoided, the fixing performance between the notch 22 and the fixing bolt 25 is improved, the fixing performance of the notch (22) is improved, and the practicability of the device is increased.
With particular reference to the attached figure 7 of the specification, the length of the said travelling carriage 6 is fifteen meters to twenty meters, and the central position of the said travelling carriage 6 is movably mounted with the fixing device 5.
The implementation mode is specifically as follows: the length value that has utilized trip frame 6 is fifteen meters to twenty meters, make operating personnel at the during operation, form the part of inseparable union between trip frame 6 and the fixing device 5, make the device at the during operation, the fixity between each subassembly increases, the practicality of the device has been improved, the associativity between each subassembly of the device has been increased, the device practicality has been improved, the work efficiency of the device has been increased, make the device in the well head required operating time's of oil pumping reduce greatly, the practicality of the device has been increased, the economic benefits of the device has been improved, the work degree of difficulty of operating personnel has been reduced, the practicality of the device has been increased.
The working principle is as follows:
a preparation stage: firstly, all components of the device are installed, the device is started normally, then the rotating motor 18 of the device is started normally, then the rotating motor 18 drives the horse head 7 to move up and down through the connecting rod 15 and the traveling block 6, then the horse head 7 drives, the oil pumping device 11 increases the air pressure in the oil well mouth 27, finally the pressure reaches a certain value, and the oil in the oil well mouth 27 is sprayed out from the oil well groove 12.
The working stage is as follows: firstly, the operator adjusts the weight of the counterweight device 20 by increasing or decreasing the number of the counterweight blocks 21 according to the size of the beam pumping unit, then adjusts the weight of the horse head 7 by increasing or decreasing the number of the counterweight blocks, so that the horse head 7 is matched with the counterweight device 20, and then the device works normally.
And (5) finishing: whether the fixity between each subassembly of at first operating personnel inspection device is firm, operating personnel change, maintain the ageing, too big spare part of wearing and tearing of the device after that, operating personnel normally closes the device after that, operating personnel scribble the surface of fixing device 5 the one deck lubrication with after that, clear away the surface dust of horse head 7 clean after that, finally the device has accomplished the work to the nimble counter weight of beam-pumping unit, can.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims (1)

1. The self-adaptive counterweight structure of the beam-pumping unit comprises a ground (1), a bottom plate (2) is fixedly mounted at the top end of the ground (1), a support frame (3) is fixedly mounted at the top end of the bottom plate (2), a fixed block (4) is integrally formed at the top end of the support frame (3), a fixing device (5) is welded at the top end of the fixed block (4), a traveling frame (6) is movably mounted on the surface of the fixing device (5), a horse head (7) is fixedly mounted at the left end of the traveling frame (6), a first fixed hole (8) is formed in the top end of the surface of the horse head (7), a second fixed hole (9) is formed in the surface of the bottom end of the horse head (7), a connecting rope (10) is fixedly mounted on the surface of the horse head (7), an oil pumping device (11) is connected to the bottom end of the connecting rope (10) in a friction mode, an oil well groove (12) is formed in the surface of the ground (1), oil well head (27) have been seted up on ground (1), its characterized in that: the bottom end of the traveling frame (6) is fixedly provided with a fixing plate (13), the surface of the fixing plate (13) is fixedly provided with a rivet (14), the surface of the fixing plate (13) is movably provided with a connecting rod (15), the other end of the connecting rod (15) is movably provided with a crank (16), the other end of the crank (16) is movably provided with a rotating rod (17), the other end of the rotating rod (17) is fixedly provided with a rotating motor (18), the rotating motor (18), and the surface of the rotating motor (18) is connected with a motor protection cover (19) in a friction mode; a counterweight device (20) is fixedly installed at the bottom end of the traveling frame (6), a counterweight block (21) is connected to the interior of the counterweight device (20) in a friction mode, a notch (22) is formed in the surface of the counterweight device (20), a screw rod (23) is installed on the top end of the horse head (7) in a threaded mode, a nut (24) is installed on the bottom end of the screw rod (23) in a threaded mode, a fixing bolt (25) is installed on the surface of the notch (22) in a threaded mode, and a connecting block (26) is integrally formed on the right side of the fixing bolt (25); the height of the support frame (3) is eight meters to ten meters, and the support frame (3) is made of metal; the length value of the traveling frame (6) is fifteen meters to twenty meters, and the center position of the traveling frame (6) is movably installed with the fixing device (5); the horse head (7) comprises a first balance weight (71), the top end of the first balance weight (71) is in friction connection with a second balance weight (72), the top end of the second balance weight (72) is in friction connection with a third balance weight (73), the top end of the third balance weight (73) is in friction connection with a fourth balance weight (74), the top end of the fourth balance weight (74) is in friction connection with a fifth balance weight (75), and the top end of the fifth balance weight (75) is in friction connection with a sixth balance weight (76); the horse head (7) is positioned right above the oil well groove (12); the motor protection cover (19) is box-shaped, and the motor protection cover (19) is made of metal; the number of the counter weight blocks (21) is five, the five counter weight blocks (21) are sequentially connected in a notch (22) on the surface of the counter weight device (20) in a friction mode, and the single weight of each counter weight block (21) is two hundred kilograms; the surface of the notch (22) is provided with threads; an operator adjusts the weight of the counterweight device (20) by increasing and decreasing the number of the counterweight blocks (21) according to the size of the beam pumping unit, then adjusts the weight of the horse head (7) by increasing and decreasing the number of the counterweight blocks, so that the horse head (7) is matched with the counterweight device (20), the counterweight device (20) and the horse head (7) can change the weight of the horse head, the friction force between the travelling frame (6) and the supporting device is reduced to the minimum, and the service life of the travelling frame (6) is prolonged.
CN201910923269.XA 2019-09-27 2019-09-27 Self-adaptive counterweight structure of beam-pumping unit Active CN110700797B (en)

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CN110700797B true CN110700797B (en) 2021-12-03

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CN202300331U (en) * 2011-10-11 2012-07-04 成都鑫泽机械有限公司 Donkey head lateral plate
CN205423122U (en) * 2016-03-21 2016-08-03 张凌川 Beam -pumping unit counter weight
CN105986784A (en) * 2016-07-07 2016-10-05 刘昆明 Beam-pumping unit based on direct drive motor
CN207470157U (en) * 2017-11-23 2018-06-08 中国石油技术开发公司 A kind of tail counter weight device of composite beam-balance pumping unit
CN208669282U (en) * 2018-09-18 2019-03-29 李晶 A kind of beam pumping unit balance adjusting device
CN208858331U (en) * 2018-09-30 2019-05-14 郑福森 The mobile auxiliary balance device in tail portion for pumping unit
CN209062990U (en) * 2018-12-03 2019-07-05 牛云超 Multi-functional tool of unloading for pumping unit

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Publication number Priority date Publication date Assignee Title
US6655224B1 (en) * 2000-06-28 2003-12-02 No. 3 Machine Tool Plant Of The Xinjiang Downward offset barbell type walking beam compositively balance oil pump
CN104563970B (en) * 2014-12-31 2018-04-03 新疆维吾尔自治区第三机床厂 Digital automatic control oil pumping method and shifting balance digitlization oil pumper
US10955825B2 (en) * 2016-05-13 2021-03-23 General Electric Company Beam pumping unit and method of operation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202300331U (en) * 2011-10-11 2012-07-04 成都鑫泽机械有限公司 Donkey head lateral plate
CN205423122U (en) * 2016-03-21 2016-08-03 张凌川 Beam -pumping unit counter weight
CN105986784A (en) * 2016-07-07 2016-10-05 刘昆明 Beam-pumping unit based on direct drive motor
CN207470157U (en) * 2017-11-23 2018-06-08 中国石油技术开发公司 A kind of tail counter weight device of composite beam-balance pumping unit
CN208669282U (en) * 2018-09-18 2019-03-29 李晶 A kind of beam pumping unit balance adjusting device
CN208858331U (en) * 2018-09-30 2019-05-14 郑福森 The mobile auxiliary balance device in tail portion for pumping unit
CN209062990U (en) * 2018-12-03 2019-07-05 牛云超 Multi-functional tool of unloading for pumping unit

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