CN201874918U - Composite hydraulic cylinder and electrohydraulic proportional lifting system thereof - Google Patents

Composite hydraulic cylinder and electrohydraulic proportional lifting system thereof Download PDF

Info

Publication number
CN201874918U
CN201874918U CN2010206025781U CN201020602578U CN201874918U CN 201874918 U CN201874918 U CN 201874918U CN 2010206025781 U CN2010206025781 U CN 2010206025781U CN 201020602578 U CN201020602578 U CN 201020602578U CN 201874918 U CN201874918 U CN 201874918U
Authority
CN
China
Prior art keywords
described
connected
cylinder
hydraulic
fixing column
Prior art date
Application number
CN2010206025781U
Other languages
Chinese (zh)
Inventor
刘新会
孙军
金鑫
罗军
王昊
朱斌
田军
周华
Original Assignee
中国石油天然气股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国石油天然气股份有限公司 filed Critical 中国石油天然气股份有限公司
Priority to CN2010206025781U priority Critical patent/CN201874918U/en
Application granted granted Critical
Publication of CN201874918U publication Critical patent/CN201874918U/en

Links

Abstract

The utility model discloses a composite hydraulic cylinder and an electrohydraulic proportional lifting system thereof, which belong to the field of lifting devices. The composite hydraulic cylinder with a counterweight cavity is connected with a hydraulic energy accumulator to function as mechanical counterweight, thereby the lifting system is simple in structure and easy in mounting, capital construction quantity is reduced, and the electrohydraulic proportional lifting system can be applied to areas with low soil bearing capacity and difficulty in foundation construction. Simultaneously, by the aid of the advantages of energy conservation of the hydraulic energy accumulator, installed power and energy consumption of the lifting system are reduced greatly, and engineering practicality is high.

Description

A kind of composite hydraulic cylinder and electric-hydraulic proportion hoisting system thereof

Technical field

The utility model relates to the lift device field, particularly a kind of energy-saving electric-hydraulic proportion hoisting system.

Background technique

Rod pumping pump is because simple in structure, technical maturity, easy and simple to handle and maintenance easily, are main mechanical oil recovery equip ments, and the oil field all over the world is widely used.

At the scene, oil field, what the rod pumping pump use was more is the slide beam lift device at present, and the slide beam lift device mainly is made up of four major parts such as walking beam, connecting rod, crank mechanism, speed reducer, power equipment and auxiliary equipment.During work, the transmission of motor becomes moving up and down of horse head through speed reducer, crank mechanism, connecting rod, horse head moves up and down through the plunger that polished rod, sucker rod drive downhole pump, thereby constantly the crude oil in the well is extracted out pit shaft, during work by the horse head realization counterweight that on walking beam, moves around.

In realizing process of the present utility model, the inventor finds that there is following problem at least in prior art:

Shortcoming such as slide beam lift device counterbalance effect is undesirable, parameter adjustment is inconvenient, sucker rod mechanical wear is serious, the heavy huge and equipment of structure and capital construction have high input.

The model utility content

The utility model is in order to solve the deficiencies in the prior art, a kind of composite hydraulic cylinder and electric-hydraulic proportion hoisting system thereof are provided, be connected with hydraulic accumulator by the composite hydraulic cylinder that will have the counterweight chamber, substitute the effect of mechanical counterweight, make hoisting system simple in structure, be easy to install, thereby reduced the construction project amount, it can be used in area low in the soil pressure-bearing, that foundation construction is difficult, utilize the power savings advantages of hydraulic accumulator simultaneously, reduced the installed power and the energy consumption of hoisting system significantly, engineering practicability is strong.

The technological scheme that its technical problem that solves the utility model adopts is:

A kind of composite hydraulic cylinder comprises:

Comprise the fixing column plug cylinder, the top of described fixing column plug cylinder is provided with breach, the bottom of described fixing column plug cylinder is connected with base, described base is provided with non-movable piston, described non-movable piston is located in the described fixing column plug cylinder, form chuck with described fixing column plug cylinder, be provided with mobile piston in the described chuck;

The upper surface of described mobile piston is connected with the opening end of mobile piston cylinder, and the sealing end of described mobile piston cylinder passes described breach;

Form first active chamber between described mobile piston cylinder, described mobile piston and the described fixing column plug cylinder three, form second active chamber between described mobile piston cylinder, described mobile piston and the described non-movable piston three, form the counterweight chamber between described mobile piston, described non-movable piston, described fixing column plug cylinder and the described base;

The chamber wall of described first active chamber is provided with the first oil transportation hole, and the chamber wall of described second active chamber is provided with the second oil transportation hole, and the chamber wall in described counterweight chamber is provided with counterweight oil transportation hole.

The described first oil transportation hole is located on the described fixing column plug cylinder, and communicates with described first active chamber.

Described non-movable piston is a hollow-core construction, and the described second oil transportation hole is located on the described base, and with described hollow communicating.

Described counterweight oil transportation hole is located on the described fixing column plug cylinder, and communicates with described counterweight chamber.

Another technological scheme that the utility model embodiment provides is:

A kind of electric-hydraulic proportion hoisting system comprises the working connection oil hydraulic pump, and described working connection oil hydraulic pump is connected with first one-way valve, and described first one-way valve is connected with electrohydraulic proportional directional valve, also comprises:

Two composite hydraulic cylinders, first active chamber of described composite hydraulic cylinder is connected with described electrohydraulic proportional directional valve with second active chamber, the sealing end of the mobile piston cylinder of described composite hydraulic cylinder is connected with lifting frame, and the counterweight oil transportation hole of described composite hydraulic cylinder is connected with hydraulic accumulator;

Described hydraulic accumulator is connected with second one-way valve, and described second one-way valve is connected with the repairing oil hydraulic pump;

Two described composite hydraulic cylinders equate with the central shaft distance of described lifting frame, treat that lift device is positioned at the central axis of described lifting frame.

Described electric-hydraulic proportion hoisting system, also comprise displacement transducer, the input end of described displacement transducer is connected with the described lift device for the treatment of, the output terminal of described displacement transducer is connected with the input end of adder, the input end of described adder also is connected with the displacement signal output unit, and the output terminal of described adder is connected with described electrohydraulic proportional directional valve.

The described lift device for the treatment of is a rod pumping pump, and described rod pumping pump comprises sucker rod, and described sucker rod lower end is connected with oil well pump, and described sucker rod upper end is connected with described lifting frame.

The beneficial effect of the technological scheme that the utility model embodiment provides is: combine with hydraulic accumulator by the composite hydraulic cylinder that will have the counterweight chamber, substitute the effect of mechanical counterweight, make hoisting system simple in structure, be easy to install, thereby reduced the construction project amount, the area that it can be low in the soil pressure-bearing, foundation construction is difficult is used, but the electric-hydraulic proportion hoisting system have stroke jig frequency step-less adjustment, up-downgoing adjustable-speed, commutation and has reduced advantages such as the installed power of hoisting system and energy consumption and engineering practicability are strong steadily, significantly simultaneously.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment's technological scheme, to do one to the accompanying drawing that uses among the embodiment below introduces simply, apparently, below listed accompanying drawing only be embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the composite hydraulic cylinder schematic representation that the utility model embodiment provides;

Fig. 2 is the electric-hydraulic proportion hoisting system schematic representation that the utility model embodiment provides.

In the accompanying drawing, the component list of each label representative is as follows:

1, working connection oil hydraulic pump, 2, first relief valve, 3, first one-way valve, 4, first safety valve, 5, accurate filter, 6, electrohydraulic proportional directional valve, 7, composite hydraulic cylinder, 8, the repairing oil hydraulic pump, 9, second one-way valve, 10, second relief valve, 11, second safety valve, 12, hydraulic accumulator, 13, oil well pump, 14, sucker rod, 15, lifting frame, 16, displacement transducer, 17, adder, 18, the displacement signal output unit, 19, displacement controller;

7-1, non-movable piston, 7-2, displacement piston, 7-3, mobile piston cylinder, 7-4, fixing column plug cylinder, 7-5, second active chamber, 7-6, the second oil transportation hole, 7-7, counterweight oil transportation hole, 7-8, counterweight chamber, 7-9, first active chamber, 7-10, the first oil transportation hole, 7-11, base.

Embodiment

For making the purpose of this utility model, technological scheme and advantage clearer, the utility model mode of execution is described in further detail below in conjunction with accompanying drawing.

Embodiment 1

Referring to Fig. 1, a kind of composite hydraulic cylinder, comprise downward opening fixing column plug cylinder 7-4, the top of fixing column plug cylinder 7-4 is provided with breach, the bottom of fixing column plug cylinder 7-4 is connected with base 7-11, base 7-11 is provided with non-movable piston 7-1, non-movable piston 7-1 is located in the fixing column plug cylinder 7-4, form chuck with fixing column plug cylinder 7-4, be provided with mobile piston 7-2 in the described chuck, the inner side edge of mobile piston 7-2 contacts with non-movable piston 7-1, the outer side of mobile piston 7-2 contacts with fixing column plug cylinder 7-4, the upper surface of mobile piston 7-2 is connected with the opening end of mobile piston cylinder 7-3, and the sealing end of mobile piston cylinder 7-3 passes the breach of fixing column plug cylinder 7-4, and the casing wall outer surface contacts with fixing column plug cylinder 7-4;

The cavity that forms between mobile piston cylinder 7-3, mobile piston 7-2 and the fixing column plug cylinder 7-4 three is the first active chamber 7-9, the cavity that forms between mobile piston cylinder 7-3, mobile piston 7-2 and the non-movable piston 7-1 three is the second active chamber 7-5, and the cavity that forms between mobile piston 7-2, non-movable piston 7-1, fixing column plug cylinder 7-4 and the base 7-11 is counterweight chamber 7-8;

The chamber wall of the first active chamber 7-9 is provided with the first oil transportation hole 7-10, and the chamber wall of the second active chamber 7-5 is provided with the second oil transportation hole 7-6, and the chamber wall of counterweight chamber 7-8 is provided with counterweight oil transportation hole 7-7.

The composite hydraulic cylinder that present embodiment provides, design by counterweight chamber 7-8 comes to be the lift device counterweight, substituted the effect of mechanical counterweight, simplified the counter weight device of hoisting system greatly, make whole hoisting system simple in structure, be easy to install, thereby reduced the construction project amount, and it can be used in area low in the soil pressure-bearing, that foundation construction is difficult, engineering practicability is strong.

Be connected with pipeline road for convenience, the first oil transportation hole 7-10 of present embodiment is located on the casing wall of fixing column plug cylinder 7-4 upper end, communicates with the first active chamber 7-9; Non-movable piston 7-1 is a hollow-core construction, and the second oil transportation hole 7-6 is located on the base 7-11, and communicates with the hollow of non-movable piston 7-1; Counterweight oil transportation hole 7-7 is located on the casing wall of fixing column plug cylinder 7-4 lower end, and communicates with counterweight chamber 7-8.

Embodiment 2

Present embodiment provides a kind of electric-hydraulic proportion hoisting system, the composite hydraulic cylinder that the composite hydraulic cylinder that adopts in the described system provides for embodiment 1.

See figures.1.and.2, a kind of electric-hydraulic proportion hoisting system, comprise working connection oil hydraulic pump 1, working connection oil hydraulic pump 1 is connected with first one-way valve 3 by petroleum pipeline, first one-way valve 3 is connected with electrohydraulic proportional directional valve 6, described system comprises two composite hydraulic cylinders 7, the first active chamber 7-9 of two composite hydraulic cylinders 7 is connected with first output terminal of electrohydraulic proportional directional valve 6, the second active chamber 7-5 of two composite hydraulic cylinders 7 is connected with second output terminal of electrohydraulic proportional directional valve 6, the sealing end of the mobile piston cylinder 7-3 of composite hydraulic cylinder 7 is connected with lifting frame 15, the counterweight oil transportation hole 7-7 of composite hydraulic cylinder 7 is connected with hydraulic accumulator 12, hydraulic accumulator 12 is connected with second one-way valve 9, and second one-way valve 9 is connected with repairing oil hydraulic pump 8.Two composite hydraulic cylinders 7 equate with the central shaft distance of lifting frame 15 in the hoisting system of present embodiment, treat that lift device is positioned at the central axis of lifting frame 15.

Described when treating the up work of lift device: electrohydraulic proportional directional valve 6 switches to described second output terminal, working connection oil hydraulic pump 1 by pipeline road through first one-way valve 3, electrohydraulic proportional directional valve 6 is to the second active chamber 7-5 fuel feeding of composite hydraulic cylinder 7, the mobile piston cylinder 7-3 of composite hydraulic cylinder 7 drives mobile piston 7-2 and moves up, hydraulic accumulator 12 releases energy simultaneously, to the counterweight chamber of composite hydraulic cylinder 7 7-8 fuel feeding, promoting mobile piston 7-2 moves up, mobile piston cylinder 7-3 drives lifting frame 15 and moves up, thereby the described lift device for the treatment of of lifting frame 15 drives is up.

Described when treating the lift device downlink working:

Electrohydraulic proportional directional valve 6 switches to described first output terminal, working connection oil hydraulic pump 1 is by first one-way valve 3, the electrohydraulic proportional directional valve 6 first active chamber 7-9 fuel feeding to composite hydraulic cylinder 7, the mobile piston 7-2 of composite hydraulic cylinder 7 moves down, oil among the counterweight chamber 7-8 of composite hydraulic cylinder 7 flows back to hydraulic accumulator 12 simultaneously, mobile piston 7-2 pulling mobile piston cylinder 7-3 moves down, thereby the described lift device for the treatment of of lifting frame 15 drives is descending.This moment, the oil pressure in the hydraulic accumulator 12 raise, and absorbed energy, described when treating that lift device is up hydraulic accumulator 12 release energy, can reduce the installed power of hoisting system significantly, reach energy-saving effect.

The electric-hydraulic proportion hoisting system that present embodiment provides, combine with hydraulic accumulator 12 by the composite hydraulic cylinder 7 that will have counterweight chamber 7-8, substitute the effect of mechanical counterweight, make hoisting system simple in structure, be easy to install, thereby reduced the construction project amount, the area that it can be low in the soil pressure-bearing, foundation construction is difficult is used, and the electric-hydraulic proportion hoisting system has up-downgoing adjustable-speed, commutation and has reduced advantages such as the installed power of hoisting system and energy consumption and engineering practicability are strong steadily, significantly simultaneously.

Embodiment 3

Present embodiment is based on embodiment 2, is with embodiment 2 difference:

The lift device for the treatment of of present embodiment is a rod pumping pump, and described rod pumping pump comprises sucker rod 14, takes out sucker rod 14 lower ends and is connected with oil well pump 13, and beam hanger 14 upper ends are connected with lifting frame 15.The electric-hydraulic proportion hoisting system that present embodiment provides, combine with hydraulic accumulator 12 by the composite hydraulic cylinder 7 that will have counterweight chamber 7-8, substitute the effect of mechanical counterweight, make described rod pumping pump hoisting system simple in structure, be easy to install, thereby reduced the construction project amount, make the area that it can be low in the soil pressure-bearing, foundation construction is difficult, comprise in the offshore oil exploitation and using.

But for the stroke jig frequency step-less adjustment that makes the electric-hydraulic proportion hoisting system, regulate up-downgoing speed and make commutation more steady more easily, the electric-hydraulic proportion hoisting system of present embodiment also comprises displacement controller 19, and displacement controller 19 is made up of adder 17 and displacement signal output unit 18.The displacement signal output unit 18 that present embodiment adopted is computer, but is not used in restriction the present invention, and displacement signal output unit 18 can also be devices such as PLC (Programmable Logic Controller, programmable controller) or single-chip microcomputer.

The input end of displacement transducer 16 is connected with sucker rod 14, the output terminal of displacement transducer 16 is connected with the input end of adder 17, the input end of adder 17 also is connected with displacement signal output unit 18, and the output terminal of adder 17 is connected with electrohydraulic proportional directional valve 6.Displacement transducer 16 detects the displacement of sucker rod 14, displacement signal is outputed to adder 17, adder 17 is obtained the displacement setting signal of displacement signal output unit 18 outputs simultaneously, described displacement setting signal is by Programming with Pascal Language software the time dependent displacement diagram of displacement to be stored in the displacement signal output unit 18, the different shift value that displacement signal output unit 18 is exported in the different time according to the described displacement diagram of storage, described displacement setting signal in the present embodiment is stored in the computer by the C language, but be not limited to the present invention, described displacement setting signal can also pass through C++, VB, configuration software or LABVIEW graphical programming software realize.The described displacement setting signal of adder 17 usefulness deducts described displacement signal and obtains deviation signal, and described deviation signal outputed to electrohydraulic proportional directional valve 6, electrohydraulic proportional directional valve 6 is according to described deviation signal work, thereby realized that the described lift device for the treatment of moves according to the displacement diagram of setting in the displacement signal output unit 18, control the described lift device displacement for the treatment of according to different described displacement diagrams, just can obtain different up-downgoing speed, and the step-less adjustment of realization rod pump stroke jig frequency, by adjusting described displacement diagram, use rational displacement diagram effectively to control rod pump and steadily commutate.

In order better to control the fuel transfer pressure of pipeline road, be provided with first relief valve 2 between first one-way valve 3 and the working connection oil hydraulic pump 1, be provided with second relief valve 10 between the hydraulic accumulator 12 and second one-way valve 9, adjust the pipeline fuel transfer pressure by relief valve.

Be provided with first safety valve 4 between the electrohydraulic proportional directional valve 6 and first one-way valve 3, when oil transportation is transshipped, open first safety valve, 4 overflows unloading, play the effect of protection downstream instrument and equipment; Be provided with second safety valve 11 between the hydraulic accumulator 12 and second one-way valve 9; when repairing oil hydraulic pump 8 passes through second one-way valve 9 to hydraulic accumulator 12 repairings; if hydraulic accumulator 12 overloads are then by second safety valve, 11 overflow unloading protecting hydraulic accumulators 12.

In order to prevent that electric-hydraulic proportion one-way valve 6 from being stopped up by the impurity in the fluid of flowing through, and also is provided with accurate filter 15 between the electric-hydraulic proportion one-way valve 6 and first one-way valve 3.

Partial content in the technological scheme that above embodiment provides can realize that its software program is stored in the storage medium that can read by software programming, storage medium for example: the hard disk in the computer, CD or floppy disk.

The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (7)

1. composite hydraulic cylinder is characterized in that:
Comprise the fixing column plug cylinder, the top of described fixing column plug cylinder is provided with breach, the bottom of described fixing column plug cylinder is connected with base, described base is provided with non-movable piston, described non-movable piston is located in the described fixing column plug cylinder, form chuck with described fixing column plug cylinder, be provided with mobile piston in the described chuck;
The upper surface of described mobile piston is connected with the opening end of mobile piston cylinder, and the sealing end of described mobile piston cylinder passes described breach;
Form first active chamber between described mobile piston cylinder, described mobile piston and the described fixing column plug cylinder three, form second active chamber between described mobile piston cylinder, described mobile piston and the described non-movable piston three, form the counterweight chamber between described mobile piston, described non-movable piston, described fixing column plug cylinder and the described base;
The chamber wall of described first active chamber is provided with the first oil transportation hole, and the chamber wall of described second active chamber is provided with the second oil transportation hole, and the chamber wall in described counterweight chamber is provided with counterweight oil transportation hole.
2. composite hydraulic cylinder according to claim 1 is characterized in that: the described first oil transportation hole is located on the described fixing column plug cylinder, and communicates with described first active chamber.
3. composite hydraulic cylinder according to claim 1 is characterized in that: described non-movable piston is a hollow-core construction, and the described second oil transportation hole is located on the described base, and with described hollow communicating.
4. composite hydraulic cylinder according to claim 1 is characterized in that: described counterweight oil transportation hole is located on the described fixing column plug cylinder, and communicates with described counterweight chamber.
5. an electric-hydraulic proportion hoisting system comprises the working connection oil hydraulic pump, and described working connection oil hydraulic pump is connected with first one-way valve, and described first one-way valve is connected with electrohydraulic proportional directional valve, it is characterized in that:
Also comprise two composite hydraulic cylinders, first active chamber of described composite hydraulic cylinder is connected with described electrohydraulic proportional directional valve with second active chamber, the sealing end of the mobile piston cylinder of described composite hydraulic cylinder is connected with lifting frame, and the counterweight oil transportation hole of described composite hydraulic cylinder is connected with hydraulic accumulator;
Described hydraulic accumulator is connected with second one-way valve, and described second one-way valve is connected with the repairing oil hydraulic pump;
Two described composite hydraulic cylinders equate with the central shaft distance of described lifting frame, treat that lift device is positioned at the central axis of described lifting frame.
6. electric-hydraulic proportion hoisting system according to claim 5, it is characterized in that, also comprise displacement transducer, the input end of described displacement transducer is connected with the described lift device for the treatment of, the output terminal of described displacement transducer is connected with the input end of adder, the input end of described adder also is connected with the displacement signal output unit, and the output terminal of described adder is connected with described electrohydraulic proportional directional valve.
7. electric-hydraulic proportion hoisting system according to claim 5, it is characterized in that the described lift device for the treatment of is a rod pumping pump, described rod pumping pump comprises sucker rod, described sucker rod lower end is connected with oil well pump, and described sucker rod upper end is connected with described lifting frame.
CN2010206025781U 2010-11-09 2010-11-09 Composite hydraulic cylinder and electrohydraulic proportional lifting system thereof CN201874918U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010206025781U CN201874918U (en) 2010-11-09 2010-11-09 Composite hydraulic cylinder and electrohydraulic proportional lifting system thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010206025781U CN201874918U (en) 2010-11-09 2010-11-09 Composite hydraulic cylinder and electrohydraulic proportional lifting system thereof

Publications (1)

Publication Number Publication Date
CN201874918U true CN201874918U (en) 2011-06-22

Family

ID=44162836

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010206025781U CN201874918U (en) 2010-11-09 2010-11-09 Composite hydraulic cylinder and electrohydraulic proportional lifting system thereof

Country Status (1)

Country Link
CN (1) CN201874918U (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102900400A (en) * 2012-09-21 2013-01-30 浙江大学 Compact hydraulic oil pumping machine adopting composited pneumatic-hydraulic cylinder
CN103061717A (en) * 2013-01-05 2013-04-24 无锡市科优液压设备制造有限公司 Four-cylinder type hydraulic pumping unit
CN103061718A (en) * 2013-01-05 2013-04-24 无锡市科优液压设备制造有限公司 Dual-plunger cylinder type hydraulic pumping unit
CN103075133A (en) * 2013-01-05 2013-05-01 无锡市科优液压设备制造有限公司 Flow compensation type hydraulic pumping unit
CN103670343A (en) * 2013-12-20 2014-03-26 王钰 Hydraulic oil pumping drive device
CN105523508A (en) * 2015-12-29 2016-04-27 太原理工大学 Control loop of forklift working device
CN109882457A (en) * 2019-04-08 2019-06-14 长沙理工大学 A kind of energy-regenerating system of combined type hydraulic cylinder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102900400A (en) * 2012-09-21 2013-01-30 浙江大学 Compact hydraulic oil pumping machine adopting composited pneumatic-hydraulic cylinder
CN103061717A (en) * 2013-01-05 2013-04-24 无锡市科优液压设备制造有限公司 Four-cylinder type hydraulic pumping unit
CN103061718A (en) * 2013-01-05 2013-04-24 无锡市科优液压设备制造有限公司 Dual-plunger cylinder type hydraulic pumping unit
CN103075133A (en) * 2013-01-05 2013-05-01 无锡市科优液压设备制造有限公司 Flow compensation type hydraulic pumping unit
CN103061717B (en) * 2013-01-05 2015-09-02 无锡市科优液压设备制造有限公司 A kind of four cylinder type hydraulic oil pumps
CN103670343A (en) * 2013-12-20 2014-03-26 王钰 Hydraulic oil pumping drive device
CN105523508A (en) * 2015-12-29 2016-04-27 太原理工大学 Control loop of forklift working device
CN105523508B (en) * 2015-12-29 2017-09-22 太原理工大学 A kind of control loop of fork truck working device
CN109882457A (en) * 2019-04-08 2019-06-14 长沙理工大学 A kind of energy-regenerating system of combined type hydraulic cylinder

Similar Documents

Publication Publication Date Title
CN102943636B (en) Winch heave compensation device for ocean floating drilling platform
CN101736729B (en) Lifting mechanism of free dropping type forced ramming machine with hammer
CN203461740U (en) Double-cylinder synchronous luffing system of crane
CN202559403U (en) Controllable mechanism type light-duty loading machine
CN201934087U (en) Driving control device for rotary drilling rig and rotary drilling rig
CN101538998B (en) Improved automatic control hydraulic drive oil pumping machine
CN202000993U (en) Novel main hoist floating system for rotary drilling rig
CN202401490U (en) Controlled mechanism type loading machine with high bearing capacity
CN202201645U (en) Gantry crane for subway construction
CN103061738A (en) Rotary drilling rig and auxiliary construction system and method thereof
CN102079482B (en) Control method and controller for crane and composite actions thereof of crane
CN202369305U (en) Crane and hoisting variable amplitude hydraulic system thereof
CN100543233C (en) High-low pump combination hydraulic system
CN202251264U (en) Potential energy recycling device for hydraulic excavator
CN1987040B (en) Synchronous control device for petroleum drilling rig derrick and base hydraulic lifting
CN106761760A (en) The power shovel lifting system of electro-hydraulic combination drive
CN207294038U (en) A kind of work about electric power platform
CN206329561U (en) mine hydraulic bracket control system
CN101638980B (en) Full-balance hydraulic transmission oil sucking machine
CN203462444U (en) Device for operating plane steel gate by hydraulic hoist
CN200982160Y (en) Hydraulic lifting synchronous controlling device for drilling rig headframe and base
CN206368387U (en) A kind of jumbolter air pump water system
CN203680578U (en) Hydraulic control device of internal mixer
CN102900400B (en) Compact hydraulic oil pumping machine adopting composited pneumatic-hydraulic cylinder
CN104627881B (en) Super deep floating type drilling multifunctional energy-saving type heavy compensation winch and operation method thereof

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant