CN105089574A - Mobile trial production equipment pulled up by hydraulic cylinder - Google Patents
Mobile trial production equipment pulled up by hydraulic cylinder Download PDFInfo
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- CN105089574A CN105089574A CN201510432412.7A CN201510432412A CN105089574A CN 105089574 A CN105089574 A CN 105089574A CN 201510432412 A CN201510432412 A CN 201510432412A CN 105089574 A CN105089574 A CN 105089574A
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Abstract
The invention discloses mobile trial production equipment pulled up by a hydraulic cylinder. The equipment comprises a two-grade oil pumping bracket and a hydraulic cylinder for driving a slide oil pumping bracket to extend, and further comprises a fixed pulley, a rope hanger, a displacement sensor, three pullup hydraulic cylinders, an energy accumulator, a programmable logic controller, a rotating speed controller, a rotating speed change motor, a dosing pump, an overflow valve, three hydraulic reversing valves, a bracket oil cylinder, a movable pulley, a control box, a prying base and a diesel generator. The core of a trial production unit is an execution part consisting of three hydraulic cylinders mounted in parallel. A power unit controls and drives the trial production unit to move. The dosing pump controls the middle hydraulic cylinder to vertically move to drive the two side hydraulic cylinders to move; and the rope hanger lifted and connected to the tail end of a steel wire rope through the steel wire rope bypassing through the fixed pulley realizes trial production. Rod cavities of the two side hydraulic cylinders are connected with the hydraulic energy accumulator as balance counterweights. The equipment has the advantages of stepless adjustment of stroke and frequency, high loading capacity, energy recycling, low motor loss and high oil production efficiency.
Description
Technical field
The present invention relates to a kind of pilot production equipment, especially relate to a kind of portable pilot production equipment adopting hydraulic cylinder to draw high of sucker rod pump formation testing pilot production ground, oil field driving arrangement.
Background technology
Pilot production, as one of the key link of oil exploitation process, has important function for oil field development.Pilot production carries out on a small scale or the production of short time oil field.The object of pilot production be to verify certain region whether exist industrialness gas stream, the hydrocarbon-bearing area of checking reservoir and oils water boundary and oil reservoir oil productive capacity, obtain each zonal testing data and fluid properties, provide foundation for CALCULATING OILFIELD reserves and establishment development plan.
Present stage, China rarely had the special equipment for pilot production, mostly utilized oil pumper to realize production testing operation.Beam pumping unit is pumping unit conventional at present, but because it is bulky, stroke jig frequency modulability is poor, and be not suitable for pilot production operating mode.Existing minority oil field adopts without beam pumping unit, this kind used for oil extractor when production testing operation stroke jig frequency adjustable, but mostly be fixed structure, quality, volume are all comparatively large, are not easy to transport.Portable pilot production equipment utilization electricity liquid technology, realizes the advantages such as stroke jig frequency adjustable range is large, load adaptation is good, complete machine controllability is strong.Meanwhile, pilot production device integration is high, and volume and weight is little, is installed on skid base, can transports easily.
Through finding the retrieval of prior art, Authorization Notice No. is that the Chinese invention patent of CN101638980B discloses a kind of full-balance hydraulic transmission oil sucking machine, this invention utilizes the form of variable pump hydraulic control cylinder, utilizes hydraulic cylinder to be moved up and down by two groups of Steel rope drive sucker rods.But this invention utilizes balancing weight as counterweight, the inconvenience of balancing weight quality adjustment.Meanwhile, adopt fixing truss structure, volume, weight are all comparatively large, are difficult to mobile.And need before oil pumping operation to lay ground in advance, and mounting equipment again.Therefore need to design the special equipment being more reasonably applicable to pilot production operating mode, to improve feasibility, the dependable with function of pilot production equipment.
Summary of the invention
The Problems existing such as comparatively large for the existing all kinds of equipment volume for pilot production operating mode, weight, efficiency is low, movement is inconvenient, control performance is poor, the object of the present invention is to provide a kind of portable pilot production equipment adopting hydraulic cylinder to draw high, overcome in background technology field all problems existed.
In order to achieve the above object, the technical solution used in the present invention is:
The present invention includes the oil pumping support of two-stage, drive the hydraulic cylinder that the oil pumping support that slides is flexible; Also comprise fixed pulley, polished rod eye, displacement transducer, three draw high hydraulic cylinder, hydraulic accumulator, programmable logic controller (PLC), rotational speed governor, variable speed motor, constant displacement pump, fuel tank, overflow valve, three hydraulicdirectional control valves, support oil cylinder, movable pulley, wire rope, control cabinet, skid base and diesel-driven generators.
Rotational speed governor connects constant displacement pump through variable speed motor, constant displacement pump inlet port connected tank, oil-out connects three hydraulicdirectional control valve high pressure oil inlet P mouths and overflow valve oil-in, the oil recirculating port connecting tank of three hydraulicdirectional control valve T mouths and overflow valve, first hydraulicdirectional control valve A mouth connects the rodless cavity that hydraulic cylinder is drawn high in centre, and B mouth connects the rod chamber that hydraulic cylinder is drawn high in centre; Be positioned at the rod chamber drawing high hydraulic cylinder drawing high hydraulic cylinder both sides in centre and connect hydraulic accumulator, after three top installing plates drawing high hydraulic cylinder piston rod connect firmly, movable pulley is connected above installing plate, one end of wire rope is fixed on the top of slip oil pumping support of oil pumping support, and the other end strides across movable pulley and is connected polished rod eye with after fixed pulley; Second hydraulicdirectional control valve A mouth connects support oil cylinder rodless cavity, and B mouth connects support cylinder rod chamber; 3rd hydraulicdirectional control valve A mouth connects the hydraulic cylinder rodless cavity driving the oil pumping support that slides flexible, and B mouth connects the hydraulic cylinder rod chamber driving the oil pumping support that slides flexible; Displacement transducer is connected with described installing plate, and programmable logic controller (PLC) is connected with displacement transducer, and programmable logic controller (PLC) is connected with variable speed motor through rotational speed governor; Three are drawn high hydraulic cylinder and are fixed in oil pumping support, and three are drawn high bottom hydraulic cylinder and are connected to oil pumping frame bottom by another installing plate, and oil pumping support bottom is hinged on one end of skid base; The bottom of support oil cylinder is hinged on skid base, and the piston rod top of support oil cylinder is hinged on oil pumping frame bottom; Diesel-driven generator and electrical control cubicles are arranged on the other end of skid base, and control cabinet is arranged on one end of skid base.
Described programmable logic controller (PLC) and rotational speed governor are arranged in electrical control cubicles; Three hydraulicdirectional control valves are arranged in control cabinet.
Described three are drawn high hydraulic cylinder and are made up of three identical hydraulic cylinders, three are drawn high hydraulic cylinder equidistant placement, centre is drawn high hydraulic cylinder and is moved up and down and drive both sides to draw high hydraulic cylinder and move up and down simultaneously, and three to draw high hydraulic cylinder parallel with support of pumping, can free-extension therein.
Described hydraulic accumulator is composed in parallel by 6 equal-sized hydraulic accumulators, and its oil inlet and outlet is linked together by fluid pressure line respectively, forms a total oil inlet and outlet.
The beneficial effect that the present invention has is:
The mode of the present invention owing to adopting three to draw high hydraulic cylinder and draw high, realize hydro-cushion counterweight and frequency conversion valveless directly drives, adopt skid structure, advantages such as there is stroke jig frequency step-less adjustment, load-carrying ability is large, energy regenerating utilizes, the loss of electric machine is little, oil recovery efficiency is high, compact conformation, quality are less, be convenient to transport, be with low cost simultaneously.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Fig. 2 is the structural front view of the present invention when formation testing pilot production operating mode.
Fig. 3 is the structure right view of the present invention when formation testing pilot production operating mode.
Fig. 4 is the structural front view of the present invention in transportation.
In figure: 1, fixed pulley, 2, polished rod eye, 3, displacement transducer, 4, three are drawn high hydraulic cylinder, 5, hydraulic accumulator, 6, programmable logic controller (PLC), 7, rotational speed governor, 8, variable speed motor, 9, constant displacement pump, 10, fuel tank, 11, overflow valve, 12, three hydraulicdirectional control valves, 13, the hydraulic cylinder that drives the oil pumping support that slides flexible, 14, support oil cylinder, 15, movable pulley, 16, wire rope, 17, oil pumping support, 18, control cabinet, 19, skid base, 20, diesel-driven generator.
Detailed description of the invention
Below in conjunction with drawings and embodiments, the present invention is further illustrated.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the present invention includes the oil pumping support 17 of two-stage, drive the hydraulic cylinder 13 that the oil pumping support that slides is flexible; Also comprise fixed pulley 1, polished rod eye 2, displacement transducer 3, three draw high hydraulic cylinder 4, hydraulic accumulator 5, programmable logic controller (PLC) 6, rotational speed governor 7, variable speed motor 8, constant displacement pump 9, fuel tank 10, overflow valve 11, three hydraulicdirectional control valves 12, support oil cylinder 14, movable pulley 15, wire rope 16, control cabinet 18, skid base 19 and diesel-driven generators 20.
Rotational speed governor 7 connects constant displacement pump 9 through variable speed motor 8, constant displacement pump 9 inlet port connected tank 10, oil-out connects three hydraulicdirectional control valve 12 high pressure oil inlet P mouths and overflow valve 11 oil-in, the oil recirculating port connecting tank 10 of three hydraulicdirectional control valve 12T mouths and overflow valve 11, first hydraulicdirectional control valve 12A mouth connects the rodless cavity that hydraulic cylinder 4 is drawn high in centre, and B mouth connects the rod chamber that hydraulic cylinder is drawn high in centre; Be positioned at centre and draw high the rod chamber drawing high hydraulic cylinder 4 of hydraulic cylinder 4 both sides by fluid pressure line connection hydraulic accumulator 5, after three top installing plates drawing high hydraulic cylinder 4 piston rod connect firmly, movable pulley 15 is connected above installing plate, one end of wire rope 16 is fixed on the top of slip oil pumping support of oil pumping support 17, and the other end strides across movable pulley 15 and is connected polished rod eye 2 with after fixed pulley 1; Second hydraulicdirectional control valve 12A mouth connects support oil cylinder 14 rodless cavity, and B mouth connects support oil cylinder 14 rod chamber; 3rd hydraulicdirectional control valve 12A mouth connects hydraulic cylinder 13 rodless cavity driving the oil pumping support that slides flexible, and B mouth connects hydraulic cylinder 13 rod chamber driving the oil pumping support that slides flexible; Displacement transducer 3 is connected with described installing plate, and programmable logic controller (PLC) 6 is connected with displacement transducer 3, and programmable logic controller (PLC) 6 is connected with variable speed motor 8 through rotational speed governor 7; Three are drawn high hydraulic cylinder 4 and are fixed in oil pumping support 17, and three are drawn high bottom hydraulic cylinder 4 and are connected to bottom oil pumping support 17 by another installing plate, and oil pumping support 17 bottom is hinged on one end of skid base 19; The bottom of support oil cylinder 14 is hinged on skid base 19, and the piston rod top of support oil cylinder 14 is hinged on bottom oil pumping support 17; Diesel-driven generator 20 and electrical control cubicles are arranged on the other end of skid base 17, and control cabinet 18 is arranged on one end of skid base 17.
Described programmable logic controller (PLC) 6 and rotational speed governor 7 are arranged in electrical control cubicles; Three hydraulicdirectional control valves 12 are arranged in control cabinet 18.
As shown in Figure 1, described three are drawn high hydraulic cylinder 4 and are made up of three identical hydraulic cylinders, three are drawn high hydraulic cylinder equidistant placement, centre is drawn high hydraulic cylinder and is moved up and down and drive both sides to draw high hydraulic cylinder and move up and down simultaneously, three to draw high hydraulic cylinder 4 parallel with oil pumping support 17, can free-extension therein; Compact layout and structure, draws high the mechanical strength that hydraulic cylinder also improves oil pumping support simultaneously.
Described hydraulic accumulator 5 is composed in parallel by 6 equal-sized hydraulic accumulators, and its oil inlet and outlet is linked together by fluid pressure line respectively, forms a total oil inlet and outlet.By by hydraulic accumulator volume dispersed placement, can topological simplicity be made, reduce equipment volume.
The hydraulic cylinder 13 draw high hydraulic cylinder 4 in the middle of described constant displacement pump 9 hydraulic oil outlet is connected respectively by three hydraulicdirectional control valves 12, driving the oil pumping support that slides flexible and support oil cylinder 14, both sides are drawn high hydraulic cylinder rod chamber and are connected with hydraulic accumulator 5; Hydraulic cylinder is drawn high as main driving hydraulic cylinder in centre, hydraulic cylinder is drawn high as counterweight in both sides, recovers energy, release energy in sucker rod uphill process in sucker rod decline process, by regulating hydraulic accumulator 5 supercharging pressure, counterweight forces size can be regulated easily; Constant displacement pump 9 drives when production testing operation three to draw high hydraulic cylinder 4 and moves up and down, after the end of job or start operation front wheel driving and drive the flexible hydraulic cylinder 13 of the oil pumping support that slides and support oil cylinder 14 to stretch, thus drive oil pumping to stretch out, regain, frame holds up or fell.Equipment only needs an energy source, simplifies system, reduces equipment volume and weight.
Three are drawn high hydraulic cylinder 4 and pull load, without the need to considering strut stability, adding the stability of frame for movement, reducing the volume of hydraulic cylinder simultaneously.
Diesel-driven generator 20 is enabled during non-transformer in field work at equipment, for equipment provides electric energy; When equipment can connect power supply, diesel-driven generator 20 can be closed, utilize external power source.
As shown in Figure 4, all sets of elements of equipment are formed on skid base 19, directly can be carried by lorry without the need to disassembling; During formation testing production testing operation, only skid base 19 need be fixed on the other ground of well head, without the need to building ground by fot screw.
The all elements of equipment are common component, need, reduce equipment cost without special processing.
The course of work of the present invention is as follows:
One, prepare before pilot production
Before carrying out production testing operation, portable pilot production equipment is placed in well head, by fot screw, skid base 19 is fixed on ground.Open diesel-driven generator 20 or be connected with power supply by equipment, programmable logic controller (PLC) 6 drives variable speed electric motors, particularly 8 to drive constant displacement pump 9 synchronous axial system by rotational speed governor 7.Second hydraulicdirectional control valve is placed in left position, and constant displacement pump 9 is to support oil cylinder 14 rodless cavity topping up, and support oil cylinder 14 piston rod stretches out and supports oil pumping support 17 to be holded up.After oil pumping support 17 is holded up, second hydraulicdirectional control valve is placed in meta, 3rd hydraulicdirectional control valve is placed in left position simultaneously, constant displacement pump 9, to the hydraulic cylinder 13 rodless cavity topping up driving the oil pumping support that slides flexible, drives flexible hydraulic cylinder 13 piston rod of the oil pumping support that slides to stretch out and drives the oil pumping support that slides to stretch out.After the oil pumping support that slides stretches out completely, the 3rd hydraulicdirectional control valve is placed in meta.
Two, sucker rod is descending:
The operating mode of programmable logic controller (PLC) 6 measured by the parameters such as the stroke jig frequency of input and displacement transducer 3, exports optimum control signal to rotational speed governor 7.The drive current of rotational speed governor 7 output frequency change, drives variable speed electric motors, particularly 8 to drive constant displacement pump 9 synchronous axial system.Variable speed electric motors, particularly rotating speed is planned according to trapezoidal rate curve, reduces the impact in commutation process, makes sucker rod easy motion simultaneously.When displacement transducer 3 detects that the piston rod drawing high hydraulic cylinder 4 reaches up predetermined stroke, programmable logic controller (PLC) 6 exports reduce-speed sign to rotational speed governor 7.When to control motor speed be zero to rotational speed governor 7, the first hydraulicdirectional control valve commutation is to left position, and programmable logic controller (PLC) 6 exports signal for faster to rotational speed governor simultaneously, makes variable speed electric motors, particularly 8 drive constant displacement pump 9 to accelerate to turn to setting speed value.The high-voltage oil liquid that constant displacement pump 9 exports enters through the first hydraulicdirectional control valve the rodless cavity that hydraulic cylinder 4 is drawn high in centre, the impetus of hydraulic cylinder and sucker rod is drawn high under the pulling function of movable pulley 15 in centre, three piston rods drawing high hydraulic cylinder 4 stretch out simultaneously, sucker rod declines, the both sides high-voltage oil liquid drawn high in hydraulic cylinder 4 rod chamber is pressed in hydraulic accumulator 5, motor is done work and the recovery of sucker rod gravitional force, reduce installed power.
Three, sucker rod is up:
When displacement transducer 3 detects that the piston rod drawing high hydraulic cylinder 4 reaches descending predetermined stroke, programmable logic controller (PLC) 6 exports reduce-speed sign to rotational speed governor 7.When to control motor speed be zero to rotational speed governor 7, the first hydraulicdirectional control valve commutation is to right position, and programmable logic controller (PLC) 6 exports signal for faster to rotational speed governor simultaneously, makes variable speed electric motors, particularly 8 drive constant displacement pump 9 to accelerate to turn to setting speed value.The hydraulic oil of constant displacement pump 9 oil-out enters through the first hydraulicdirectional control valve the rod chamber that hydraulic cylinder is drawn high in centre, high-voltage oil liquid simultaneously in accumulator 5 enters the rod chamber that hydraulic cylinder is drawn high in both sides, three piston rods drawing high hydraulic cylinder are regained, pull movable pulley 15 to decline simultaneously, movable pulley 15 drives polished rod eye 2 to rise by wire rope 16, thus drives the sucker rod be connected to below polished rod eye to rise.Sucker rod rises by the oil exploitation in oil well to ground, thus completes one action circulation.The hydraulic cylinder that draws high being positioned at both sides plays counterweight effect, makes three to draw high hydraulic cylinder force and stablizes.Repeating second and third step makes sucker rod constantly move up and down, until production testing operation completes.
Four, Postharvest handling is tried
After production testing operation terminates, the first hydraulicdirectional control valve is placed in right position, and constant displacement pump 9 draws high hydraulic cylinder rod chamber topping up by the first hydraulicdirectional control valve to centre, makes three to draw high hydraulic cylinder 4 piston rod and regains.After three are drawn high the withdrawal of hydraulic cylinder 4 piston rod, first hydraulicdirectional control valve is placed in meta, 3rd hydraulicdirectional control valve is placed in right position simultaneously, constant displacement pump 9 to the hydraulic cylinder 13 rod chamber topping up driving the oil pumping support that slides flexible, makes driving flexible hydraulic cylinder 13 piston rod of oil pumping support that slides drive the oil pumping support that slides to retract by the 3rd hydraulicdirectional control valve.After slip oil pumping support is retracted, the 3rd hydraulicdirectional control valve is placed in meta, the second hydraulicdirectional control valve is placed in right position simultaneously, constant displacement pump 9 is by the second hydraulicdirectional control valve to support oil cylinder 14 rod chamber topping up, and support oil cylinder 14 piston rod drives oil pumping support 17 to fall down.After oil pumping support 17 falls down, the second hydraulicdirectional control valve is placed in meta, and closes diesel-driven generator 20 or cut off externally fed power supply, portable pilot production Whole Equipment can be transported to subsequent work place.
Claims (4)
1. the portable pilot production equipment adopting hydraulic cylinder to draw high, comprise the oil pumping support (17) of two-stage, drive the hydraulic cylinder (13) that the oil pumping support that slides is flexible, it is characterized in that: also comprise fixed pulley (1), polished rod eye (2), displacement transducer (3), three are drawn high hydraulic cylinder, hydraulic accumulator (5), programmable logic controller (PLC) (6), rotational speed governor (7), variable speed motor (8), constant displacement pump (9), fuel tank (10), overflow valve (11), three hydraulicdirectional control valves, support oil cylinder (14), movable pulley (15), wire rope (16), control cabinet (18), skid base (19) and diesel-driven generator (20),
Rotational speed governor (7) connects constant displacement pump (9) through variable speed motor (8), constant displacement pump (9) inlet port connected tank (10), oil-out connects three hydraulicdirectional control valve high pressure oil inlet P mouths and overflow valve (11) oil-in, the oil recirculating port connecting tank (10) of three hydraulicdirectional control valve T mouths and overflow valve (11), first hydraulicdirectional control valve A mouth connects the rodless cavity that hydraulic cylinder is drawn high in centre, and B mouth connects the rod chamber that hydraulic cylinder is drawn high in centre; Be positioned at the rod chamber drawing high hydraulic cylinder drawing high hydraulic cylinder both sides in centre and connect hydraulic accumulator (5), after three top installing plates drawing high hydraulic cylinder piston rod connect firmly, movable pulley (15) is connected above installing plate, one end of wire rope (16) is fixed on the top of slip oil pumping support of oil pumping support (17), and the other end strides across movable pulley (15) and is connected polished rod eye (2) afterwards with fixed pulley (1); Second hydraulicdirectional control valve A mouth connects support oil cylinder (14) rodless cavity, and B mouth connects support oil cylinder (14) rod chamber; 3rd hydraulicdirectional control valve A mouth connects hydraulic cylinder (13) rodless cavity driving the oil pumping support that slides flexible, and B mouth connects hydraulic cylinder (13) rod chamber driving the oil pumping support that slides flexible; Displacement transducer (3) is connected with described installing plate, and programmable logic controller (PLC) (6) is connected with displacement transducer (3), and programmable logic controller (PLC) (6) is connected with variable speed motor (8) through rotational speed governor (7); Three are drawn high hydraulic cylinder and are fixed in oil pumping support (17), and three are drawn high bottom hydraulic cylinder and are connected to oil pumping support (17) bottom by another installing plate, and oil pumping support (17) bottom is hinged on one end of skid base (19); The bottom of support oil cylinder (14) is hinged on skid base (19), and the piston rod top of support oil cylinder (14) is hinged on oil pumping support (17) bottom; Diesel-driven generator (20) and electrical control cubicles are arranged on the other end of skid base (17), and control cabinet (18) is arranged on one end of skid base (17).
2. a kind of portable pilot production equipment adopting hydraulic cylinder to draw high according to claim 1, is characterized in that: described programmable logic controller (PLC) (6) and rotational speed governor (7) are arranged in electrical control cubicles; Three hydraulicdirectional control valves are arranged in control cabinet (18).
3. a kind of portable pilot production equipment adopting hydraulic cylinder to draw high according to claim 1, it is characterized in that: described three are drawn high hydraulic cylinder (4) and are made up of three identical hydraulic cylinders, three are drawn high hydraulic cylinder equidistant placement, centre is drawn high hydraulic cylinder and is moved up and down and drive both sides to draw high hydraulic cylinder and move up and down simultaneously, three to draw high hydraulic cylinder parallel with oil pumping support (17), can free-extension therein.
4. a kind of portable pilot production equipment adopting hydraulic cylinder to draw high according to claim 1, it is characterized in that: described hydraulic accumulator (5) is composed in parallel by 6 equal-sized hydraulic accumulators, its oil inlet and outlet is linked together by fluid pressure line respectively, forms a total oil inlet and outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510432412.7A CN105089574A (en) | 2015-07-22 | 2015-07-22 | Mobile trial production equipment pulled up by hydraulic cylinder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510432412.7A CN105089574A (en) | 2015-07-22 | 2015-07-22 | Mobile trial production equipment pulled up by hydraulic cylinder |
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| CN105089574A true CN105089574A (en) | 2015-11-25 |
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| CN201510432412.7A Pending CN105089574A (en) | 2015-07-22 | 2015-07-22 | Mobile trial production equipment pulled up by hydraulic cylinder |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109057756A (en) * | 2018-10-03 | 2018-12-21 | 肖国选 | Balanced type is without impact hydraulic pumping unit |
| CN109779992A (en) * | 2019-03-21 | 2019-05-21 | 福建工程学院 | A kind of multi-hydraulic-cylinder synchronous control system that novel variable speed pump control is directly driven |
| CN110194421A (en) * | 2019-06-28 | 2019-09-03 | 金川集团股份有限公司 | A kind of crane |
| CN110331963A (en) * | 2019-07-26 | 2019-10-15 | 河北华北石油荣盛机械制造有限公司 | A kind of movable oil production equipment |
| CN110578499A (en) * | 2019-08-19 | 2019-12-17 | 青岛北海俊惠电子仪表有限公司 | Hydraulic suction machine |
| CN111119792A (en) * | 2019-12-03 | 2020-05-08 | 天津瑞能电气有限公司 | New forms of energy oil pilot production system |
| CN111576537A (en) * | 2020-05-29 | 2020-08-25 | 徐州徐工挖掘机械有限公司 | Hydraulic lifting system of excavator cab and excavator |
| CN112283181A (en) * | 2020-09-25 | 2021-01-29 | 哈尔滨工业大学 | High-power-density auxiliary boosting hydraulic cylinder for foot type robot |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109057756A (en) * | 2018-10-03 | 2018-12-21 | 肖国选 | Balanced type is without impact hydraulic pumping unit |
| CN109779992A (en) * | 2019-03-21 | 2019-05-21 | 福建工程学院 | A kind of multi-hydraulic-cylinder synchronous control system that novel variable speed pump control is directly driven |
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| CN110578499A (en) * | 2019-08-19 | 2019-12-17 | 青岛北海俊惠电子仪表有限公司 | Hydraulic suction machine |
| CN111119792A (en) * | 2019-12-03 | 2020-05-08 | 天津瑞能电气有限公司 | New forms of energy oil pilot production system |
| CN111576537A (en) * | 2020-05-29 | 2020-08-25 | 徐州徐工挖掘机械有限公司 | Hydraulic lifting system of excavator cab and excavator |
| CN112283181A (en) * | 2020-09-25 | 2021-01-29 | 哈尔滨工业大学 | High-power-density auxiliary boosting hydraulic cylinder for foot type robot |
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Application publication date: 20151125 |