CN104879095A - Pumping unit horsehead connecting device - Google Patents

Pumping unit horsehead connecting device Download PDF

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Publication number
CN104879095A
CN104879095A CN201510302997.0A CN201510302997A CN104879095A CN 104879095 A CN104879095 A CN 104879095A CN 201510302997 A CN201510302997 A CN 201510302997A CN 104879095 A CN104879095 A CN 104879095A
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China
Prior art keywords
junction plate
pumping unit
shank
unit horsehead
screw
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Granted
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CN201510302997.0A
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Chinese (zh)
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CN104879095B (en
Inventor
代新勇
李好婷
王慧聪
马永超
于科杰
李永立
王培凇
杨拓
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Petrochina Co Ltd
China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Priority to CN201510302997.0A priority Critical patent/CN104879095B/en
Publication of CN104879095A publication Critical patent/CN104879095A/en
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Publication of CN104879095B publication Critical patent/CN104879095B/en
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Abstract

The invention provides a pumping unit horsehead connecting device. The pumping unit horsehead connecting device is used for connecting a first connecting plate with a second connecting plate, wherein the first connecting plate and the second connecting plate are stacked sequentially from top to bottom. The pumping unit horsehead connecting device comprises a connecting pin and a pin removal mechanism, the connecting pin comprises a pin body and an end cap connected at one end of the pin body, a detaching threaded hole is formed in the center of the end cap along the axial direction of the pin body, the pin body penetrates the first connecting plate and the second connecting plate, and the end cap overlaps on the first connecting plate. The pin removal mechanism comprises a screw and a support fixed above the connecting pin, one end of the screw penetrates the support and is screwed to the detaching threaded hole, a nut is screwed to the other end, extending out of the support, of the screw, the bottom surface of the nut butts against the support, and by means of cooperative moving of the screw and the nut, the screw is driven to move along the axial direction of the pin body so as to drive the pin body to be separated from the first connecting plate and the second connecting plate. The pumping unit horsehead connecting device enables the connecting pin to be detached simply and conveniently in a time-saving and labor-saving manner.

Description

Pumping unit horsehead linkage
Technical field
The present invention relates to technical field of petroleum extraction, particularly a kind of pumping unit horsehead linkage.
Background technology
The horse head of existing oil pumper is provided with two groups of horse head junction plates in bilateral symmetry usually, the walking beam of oil pumper is typically provided with and two groups of horse head junction plates walking beam junction plate one to one, each horse head junction plate is connected with corresponding walking beam junction plate by pin, when operation, the same side pin can be laid down, make horse head to lateral turnover thus avoid horse head to affect wellhead maintenance operation, but the pin of existing use could take out bottom firmly pounding with sledgehammer when taking out, waste time and energy, day by day increasing the weight of due to oil well load simultaneously, there is vibration in oil pumper, cause pin bore wear, pin-and-hole becomes large phenomenon and increases gradually, and the latch structure used at present is extremely simple, easily loosen, pumping unit horsehead can be caused to teetertotter when it is loosening, ftractureed in junction, the problems such as sound is large.The existence of above-mentioned unsafe factor not only have impact on the oil recovery efficiency of oil well to a great extent, and brings very large difficulty to the production of the safety and environmental protection in oil field.
Summary of the invention
The object of this invention is to provide a kind of quick detachable, and dismantle time saving and energy saving pumping unit horsehead linkage.
For achieving the above object, the invention provides a kind of pumping unit horsehead linkage, for connecting the first junction plate and the second junction plate that stack successively from top to bottom, described pumping unit horsehead linkage comprises: connecting pin, it end cap comprising shank and be connected to described shank one end, be axially arranged with dismounting screwed hole in the central authorities of described end cap along described shank, described shank is through described first junction plate and described second junction plate, and described end cap is overlapped on described first junction plate; Pulling-out mechanism, comprise screw rod and be fixed on the support above described connecting pin, one end of described screw rod is through described support and be rotatably connected in described dismounting screwed hole, the other end of described screw rod extends described support and is connected with nut, the bottom surface of described nut is against on the bracket, moved with coordinating of described nut by described screw rod, drive described screw rod moving axially and driving described shank to depart from described first junction plate and described second junction plate along described shank.
Pumping unit horsehead linkage as above, wherein, described pumping unit horsehead linkage also comprises: link, its side is opened wide, in described link, there is accommodation space, described first junction plate and described second junction plate are plugged in described accommodation space, described link upper, lower surface correspondence is provided with the pin-and-hole run through for described shank, the side relative with the open side of described link is provided with locking screw pit corresponding to described first junction plate and described second junction plate place, each described locking screw pit is connected with the lock-screw screwed in from the outside of described link, and the described lock-screw corresponding to described first junction plate is resisted against on the end face of described first junction plate along the axial direction perpendicular to described shank, described lock-screw corresponding to described second junction plate is resisted against on the end face of described second junction plate along the axial direction perpendicular to described shank.
Pumping unit horsehead linkage as above, wherein, described link is the rectangular frame that side is opened wide.
Pumping unit horsehead linkage as above, wherein, described first junction plate is the horse head junction plate be arranged on horse head, and described second junction plate is the walking beam junction plate be arranged on walking beam; Or described first junction plate is the walking beam junction plate be arranged on walking beam, described second junction plate is the horse head junction plate be arranged on horse head.
Pumping unit horsehead linkage as above, wherein, described support is inverted U-shaped.
Pumping unit horsehead linkage as above, wherein, the other end of described shank is provided with chamfering.
Pumping unit horsehead linkage as above, wherein, the other end of described screw rod is provided with rotary handle, drives described screw rod to screw in described dismounting screwed hole by rotating described rotary handle.
Pumping unit horsehead linkage as above, wherein, the other end of described screw rod is provided with the fin in regular polygon radially protruded.
Pumping unit horsehead linkage as above, wherein, described nut is hex nut, and described fin is the regular hexagon measure-alike with described nut.
Pumping unit horsehead linkage as above, wherein, the center line of described dismounting screwed hole and the axis collinear of described shank.
Compared with prior art, advantage of the present invention is as follows:
Pumping unit horsehead linkage provided by the invention, by the axis along its shank on connecting pin, dismounting screwed hole is set, and set up pulling-out mechanism, when needs dismounting connecting pin, the screw rod of pulling-out mechanism is screwed in dismounting screwed hole, be screwed in screw rod by rotating and be resisted against the nut on support, make screw rod moving axially and driving connecting pin to depart from horse head junction plate and walking beam junction plate along shank, thus the operation of dismounting connecting pin is pounded without the need to sledgehammer, and simple and convenient, time saving and energy saving; In addition, the setting of link and lock-screw, limit the horizontal degree of freedom of horse head junction plate and walking beam junction plate between shank and lock-screw, namely horse head junction plate and walking beam junction plate can not transverse shakinesses, thus oil machine horse head can not be rocked, and then reduce risk horse head and walking beam junction ftractureed, reduce noise during oil pumper work simultaneously, ensure that the oil recovery efficiency of oil well, and reduce the difficulty of oilfield safety environmental protection production.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Fig. 1 is the structural representation of the pumping unit horsehead linkage that one embodiment of the invention provides;
Fig. 2 is the structural representation of horse head linkage in the process of pulling pin shown in Fig. 1;
Fig. 3 is the structural representation of connecting pin in the horse head linkage shown in Fig. 1;
Fig. 4 is the structural representation of pulling-out mechanism in the horse head linkage shown in Fig. 1;
Fig. 5 is the structural representation of link in the horse head linkage shown in Fig. 1.
Drawing reference numeral illustrates:
1-connecting pin; 11-shank; 111-chamfering; 12-end cap; 121-dismantles screwed hole; 2-support; 3-screw rod; 31-fin; 4-nut; 5-link; 51-pin-and-hole; 52-locking screw pit; 53-accommodation space; 6-lock-screw; 7-horse head junction plate; 8-walking beam junction plate.
Detailed description of the invention
In order to have clearer understanding to technical scheme of the present invention, object and effect, existing accompanying drawings the specific embodiment of the present invention.
Hereinafter rotating forward can be rotate clockwise, and also can be rotate counterclockwise, as long as screw rod can be made to move up extract connecting pin.
As shown in Figure 1, pumping unit horsehead linkage provided by the invention, for connecting the first junction plate and the second junction plate that stack successively from top to bottom, pumping unit horsehead linkage comprises: connecting pin 1 and pulling-out mechanism, wherein, as shown in Figure 3, connecting pin 1 comprises shank 11 and is connected to the end cap 12 of shank 11 one end, dismantle screwed hole 121 in the central authorities of end cap 12 along being axially arranged with of shank 11, shank 11 is through the first junction plate and the second junction plate, and end cap 12 is overlapped on the first junction plate, as shown in Figure 4, the support 2 that pulling-out mechanism comprises screw rod 3 and is fixed on above connecting pin 1, one end of screw rod 3 through support 2 and be rotatably connected in dismounting screwed hole 121, the other end of screw rod 3 extends support 2 and is connected with nut 4, the bottom surface of nut 4 is resisted against on support 2, moved with coordinating of nut 4 by screw rod 3, drive screw 3 moving axially and driving shank 11 to depart from the first junction plate and the second junction plate along shank 11, specifically, when dismantling connecting pin 1, as shown in Figure 2, downward pressing rotary screw 3 make it screw in dismounting screwed hole 121, and make the bottom surface of nut 4 be resisted against on support 2, wherein, downward pressing screw rod 3 can increase the frictional force between end cap 12 and the first junction plate, thus limit the rotational freedom of end cap 12, screw rod 3 is made can successfully to screw in dismounting screwed hole 121, and support 2 provides a support force for nut 4, limit nut 4 simultaneously and move down degree of freedom, after screw rod 3 screws in dismounting screwed hole 121, rotate forward nut 4, along with the rotation of nut 4, screw rod 3 axially moves along shank 11, shank 11 is with screw rod 3 moving disengaging first junction plate and the second junction plate, the disassembling section of connecting pin 1 can be completed, thus make dismounting connecting pin 1 operate and pound without the need to sledgehammer, and it is simple and convenient, time saving and energy saving.
Alternatively, the first junction plate is horse head junction plate 7, second junction plate be arranged on horse head is the walking beam junction plate 8 be arranged on walking beam; Or the first junction plate is walking beam junction plate 8, second junction plate be arranged on walking beam is the horse head junction plate 7 be arranged on horse head.Hereinafter, the first junction plate is horse head junction plate 7, second junction plate is walking beam junction plate 8, and horse head junction plate 7 and walking beam junction plate 8 are equipped with the through hole run through for shank 11.
Further, in order to the through hole solving horse head junction plate 7 and walking beam junction plate 8 becomes large because wearing and tearing, pin is caused easily to loosen, pumping unit horsehead is caused to teetertotter, ftractureed in junction, the problems such as sound is large, as Fig. 1, shown in Fig. 2 and Fig. 5, in a preferred embodiment of the invention, pumping unit horsehead linkage also comprises: link 5, its side is opened wide, there is in link 5 accommodation space 53, horse head junction plate 7 and walking beam junction plate 8 are plugged in accommodation space 53, link 5 upper, lower surface correspondence is provided with the pin-and-hole 51 run through for shank 11, the side relative with the open side of link 5 is provided with locking screw pit 52 corresponding to horse head junction plate 7 and walking beam junction plate 8 place, each locking screw pit 52 is connected with the lock-screw 6 screwed in from the outside of link 5, and the lock-screw 6 corresponding to horse head junction plate 7 is resisted against along the axial direction perpendicular to shank 11 on the end face of horse head junction plate 7, lock-screw 6 corresponding to walking beam junction plate 8 is resisted against on the end face of walking beam junction plate 8 along the axial direction perpendicular to shank 11, horse head junction plate 7 and walking beam junction plate 8 are fitted tightly with shank 11, thus limit the horizontal degree of freedom of horse head junction plate 7 and walking beam junction plate 8, make horse head junction plate 7 and walking beam junction plate 8 can not transverse shakiness, thus oil machine horse head can not be rocked, and then reduce risk horse head and walking beam junction ftractureed, reduce noise during oil pumper work simultaneously, ensure that the oil recovery efficiency of oil well, and reduce the difficulty of oilfield safety environmental protection production, when needs dismounting connecting pin 1, support 2 is placed on the upper surface of link 5, screw rod 3 screws in dismounting screwed hole 121 by use instrument, screw rod 3 and connecting pin 1 are linked into an integrated entity, because lock-screw 6 makes horse head junction plate 7 and walking beam junction plate 8 fit tightly with shank 11, while the horizontal degree of freedom limiting horse head junction plate 7 and walking beam junction plate 8, limit the rotational freedom of shank 11, thus make screw rod 3 can screw in dismounting screwed hole 121 like a cork to link into an integrated entity with connecting pin 1, then lock-screw 6 is screwed out locking screw pit 52, finally use tool into rotation is resisted against the nut 4 on support 2, along with the rotation of nut 4, screw rod 3 axially moves along shank 11, shank 11 departs from horse head junction plate 7 and walking beam junction plate 8 with screw rod 3 moves, thus complete the dismounting of connecting pin 1.
Alternatively, the rectangular frame that link 5 opens wide for side, the i.e. U-shaped structure of link 5 in side, the U-shaped structure of side is simple, easy machine-shaping, cost is low, be convenient to install and dismounting, certainly, when not considering cost and weight demands, link 5 also can be the rectangular housing only having side to open wide, or half elliptic housing etc.
Alternatively, support 2 is in inverted U-shaped, and inverted U-shaped structure not only has good support performance, and structure is simple, and easy machine-shaping, is convenient to pick and place.
Alternatively, as shown in Figure 3, the other end of shank 11 is provided with chamfering 111, and the connecting pin 1 that is arranged so that of chamfering 111 can pin-and-hole 51 on easier insertion link 5 run through horse head junction plate 7 and walking beam junction plate 8, thus makes the installation of connecting pin 1 become simple and convenient.
In a specific embodiment of the present embodiment, the simple to operation of dismounting screwed hole 121 is screwed in order to make screw rod 3, time saving and energy saving, the other end of screw rod 3 is provided with rotary handle, drive screw rod 3 to rotate in screw-in dismounting screwed hole 121 by rotating rotary handle, thus screw rod 3 can be easier connected with dismounting screwed hole 121 by operating personnel.
In another specific embodiment of the present embodiment, the fin 31 in regular polygon radially protruded is provided with at the other end of screw rod 3, fin 31 can with the instrument such as spanner with the use of, thus screw rod 3 can easier be screwed in dismounting screwed hole 121 by operating personnel.
Further, nut 4 is hex nut, fin 31 is the regular hexagon measure-alike with nut 4, like this, after screw rod 3 is screwed in dismounting screwed hole 121 by use instrument (such as: spanner), instrument need not be changed or adjustment instrument can use this tool into rotation nut 4, thus save the time of replacing instrument or adjustment instrument.
Alternatively, the dismounting center line of screwed hole 121 and the axis collinear of shank 11, like this, screw rod 3 moving axially and driving shank 11 to depart from horse head junction plate 7 and walking beam junction plate 8 more smoothly along shank 11 can be made, thus it is more time saving and energy saving that dismounting connecting pin 1 is operated.
The detailed process of pumping unit horsehead linkage provided by the invention installation and dismounting is illustrated below in conjunction with accompanying drawing:
In use, as shown in Figure 1, first horse head junction plate 7 and walking beam junction plate 8 are from top to bottom inserted in the accommodation space 53 of link 5 successively, and horse head junction plate 7 and the through hole on walking beam junction plate 8 are connected with the pin-and-hole 51 on link 5 formation interface channel, again shank 11 is inserted in interface channel, and make end cap 12 be overlapped on the upper surface of link 5, by link 5, horse head junction plate 7 and walking beam junction plate 8 link into an integrated entity, then the lock-screw 6 corresponding to horse head junction plate 7 is resisted against on the end face of horse head junction plate 7 along the axial direction perpendicular to shank 11, lock-screw 6 corresponding to walking beam junction plate 8 is resisted against on the end face of walking beam junction plate 8 along the axial direction perpendicular to shank 11, horse head junction plate 7 and walking beam junction plate 8 are fitted tightly with shank 11, thus limit the horizontal degree of freedom of horse head junction plate 7 and walking beam junction plate 8, make horse head junction plate 7 and walking beam junction plate 8 can not transverse shakiness, thus complete the connection of horse head junction plate 7 and walking beam junction plate 8, when interface channel becomes large due to Long-Time Service wearing and tearing, only lock-screw 6 need be screwed and can ensure that horse head junction plate 7 and walking beam junction plate 8 fit tightly with shank 11,
As shown in Figure 2, when needs dismounting connecting pin 1, support 2 is placed on the upper surface of link 5, screw rod 3 screws in dismounting screwed hole 121 by use instrument, screw rod 3 and connecting pin 1 are linked into an integrated entity, certainly, also can after lock-screw 6 screws, just support 2 is placed on the upper surface of link 5, and use instrument to be screwed in one end of screw rod 3 in dismounting screwed hole 121, screw rod 3 and connecting pin 1 are linked into an integrated entity, because lock-screw 6 makes horse head junction plate 7 and walking beam junction plate 8 fit tightly with shank 11, while the horizontal degree of freedom limiting horse head junction plate 7 and walking beam junction plate 8, limit the rotational freedom of shank 11, thus make screw rod 3 can screw in dismounting screwed hole 121 like a cork to link into an integrated entity with connecting pin 1, then lock-screw 6 is screwed out locking screw pit 52, finally use tool into rotation is resisted against the nut 4 on support 2, because support 2 provides a support force for nut 4, limit nut 4 simultaneously and move down degree of freedom, therefore, along with the rotation of nut 4, screw rod 3 axially moves along shank 11, shank 11 departs from horse head junction plate 7 and walking beam junction plate 8 with screw rod 3 moves, thus complete the dismounting of connecting pin 1.
It should be noted that, usually bilateral symmetry is provided with two groups of horse head junction plates 7 at the horse head of oil pumper, the walking beam of oil pumper is typically provided with and two groups of horse head junction plates 7 walking beam junction plate 8 one to one, in order to avoid when operation, setting because of link 5 causes horse head can not lateral turnover, thus the situation affecting wellhead maintenance operation occurs, only the pumping unit horsehead linkage with link 5 provided by the invention need be adopted to be connected with walking beam junction plate 8 at the two groups of horse head junction plates 7 being positioned at side, opposite side adopts the connecting pin 1 with dismounting screwed hole 121 to connect, during dismounting, only need dismantle the pumping unit horsehead linkage with link 5 and lock-screw 6, to enable horse head lateral turnover, thus avoid horse head to affect wellhead maintenance operation.
In sum, pumping unit horsehead linkage provided by the invention, by the axis along its shank on connecting pin, dismounting screwed hole is set, and set up pulling-out mechanism, when needs dismounting connecting pin, the screw rod of pulling-out mechanism is screwed in dismounting screwed hole, be screwed in screw rod by rotating and be resisted against the nut on support, make screw rod moving axially and driving connecting pin to depart from horse head junction plate and walking beam junction plate along shank, thus the operation of dismounting connecting pin is pounded without the need to sledgehammer, and it is simple and convenient, time saving and energy saving; In addition, the setting of link and lock-screw, limit the degree of freedom of horse head junction plate and walking beam junction plate between shank and lock-screw, namely horse head junction plate and walking beam junction plate can not rock, thus oil machine horse head can not be teetertottered, and then reduce risk horse head and walking beam junction ftractureed, reduce noise during oil pumper work simultaneously, ensure that the oil recovery efficiency of oil well, and reduce the difficulty of oilfield safety environmental protection production.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those of ordinary skill in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.

Claims (10)

1. a pumping unit horsehead linkage, for connecting the first junction plate and the second junction plate that stack successively from top to bottom, it is characterized in that, described pumping unit horsehead linkage comprises:
Connecting pin, it end cap comprising shank and be connected to described shank one end, be axially arranged with dismounting screwed hole in the central authorities of described end cap along described shank, described shank is through described first junction plate and described second junction plate, and described end cap is overlapped on described first junction plate;
Pulling-out mechanism, comprise screw rod and be fixed on the support above described connecting pin, one end of described screw rod is through described support and be rotatably connected in described dismounting screwed hole, the other end of described screw rod extends described support and is connected with nut, the bottom surface of described nut is against on the bracket, moved with coordinating of described nut by described screw rod, drive described screw rod moving axially and driving described shank to depart from described first junction plate and described second junction plate along described shank.
2. pumping unit horsehead linkage according to claim 1, is characterized in that,
Described pumping unit horsehead linkage also comprises:
Link, its side is opened wide, in described link, there is accommodation space, described first junction plate and described second junction plate are plugged in described accommodation space, described link upper, lower surface correspondence is provided with the pin-and-hole run through for described shank, the side relative with the open side of described link is provided with locking screw pit corresponding to described first junction plate and described second junction plate place, each described locking screw pit is connected with the lock-screw screwed in from the outside of described link, and the described lock-screw corresponding to described first junction plate is resisted against on the end face of described first junction plate along the axial direction perpendicular to described shank, described lock-screw corresponding to described second junction plate is resisted against on the end face of described second junction plate along the axial direction perpendicular to described shank.
3. pumping unit horsehead linkage according to claim 2, is characterized in that,
Described link is the rectangular frame that side is opened wide.
4. pumping unit horsehead linkage according to any one of claim 1 to 3, is characterized in that,
Described first junction plate is the horse head junction plate be arranged on horse head, and described second junction plate is the walking beam junction plate be arranged on walking beam; Or described first junction plate is the walking beam junction plate be arranged on walking beam, described second junction plate is the horse head junction plate be arranged on horse head.
5. pumping unit horsehead linkage according to any one of claim 1 to 3, is characterized in that,
Described support is inverted U-shaped.
6. pumping unit horsehead linkage according to any one of claim 1 to 3, is characterized in that,
The other end of described shank is provided with chamfering.
7. pumping unit horsehead linkage according to any one of claim 1 to 3, is characterized in that,
The other end of described screw rod is provided with rotary handle, drives described screw rod to screw in described dismounting screwed hole by rotating described rotary handle.
8. pumping unit horsehead linkage according to any one of claim 1 to 3, is characterized in that,
The other end of described screw rod is provided with the fin in regular polygon radially protruded.
9. pumping unit horsehead linkage according to claim 8, is characterized in that,
Described nut is hex nut, and described fin is the regular hexagon measure-alike with described nut.
10. pumping unit horsehead linkage according to any one of claim 1 to 3, is characterized in that,
The center line of described dismounting screwed hole and the axis collinear of described shank.
CN201510302997.0A 2015-06-04 2015-06-04 Pumping unit horsehead attachment means Active CN104879095B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201510302997.0A CN104879095B (en) 2015-06-04 2015-06-04 Pumping unit horsehead attachment means

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107387029A (en) * 2017-07-21 2017-11-24 中国石油化工股份有限公司华北油气分公司采气二厂 Oil pumper

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Publication number Priority date Publication date Assignee Title
CN201339631Y (en) * 2008-12-01 2009-11-04 陈家平 Screw thread type pin
CN202510468U (en) * 2012-04-28 2012-10-31 中国石油天然气股份有限公司 Horse head pin safety device of oil pumping unit
CN203394461U (en) * 2013-07-31 2014-01-15 中国石油集团渤海石油装备制造有限公司 Connecting locking device of pumping unit beam and connecting rod
CN204344667U (en) * 2014-11-21 2015-05-20 中国石油天然气股份有限公司 Mule head pin fixing device
CN204804783U (en) * 2015-06-04 2015-11-25 中国石油天然气股份有限公司 Beam -pumping unit horse head connecting device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201339631Y (en) * 2008-12-01 2009-11-04 陈家平 Screw thread type pin
CN202510468U (en) * 2012-04-28 2012-10-31 中国石油天然气股份有限公司 Horse head pin safety device of oil pumping unit
CN203394461U (en) * 2013-07-31 2014-01-15 中国石油集团渤海石油装备制造有限公司 Connecting locking device of pumping unit beam and connecting rod
CN204344667U (en) * 2014-11-21 2015-05-20 中国石油天然气股份有限公司 Mule head pin fixing device
CN204804783U (en) * 2015-06-04 2015-11-25 中国石油天然气股份有限公司 Beam -pumping unit horse head connecting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107387029A (en) * 2017-07-21 2017-11-24 中国石油化工股份有限公司华北油气分公司采气二厂 Oil pumper
CN107387029B (en) * 2017-07-21 2019-12-27 中国石油化工股份有限公司华北油气分公司采气二厂 Oil pumping unit

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