CN103806482A - Auxiliary power energy-saving device of excavator - Google Patents

Auxiliary power energy-saving device of excavator Download PDF

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Publication number
CN103806482A
CN103806482A CN201410102328.4A CN201410102328A CN103806482A CN 103806482 A CN103806482 A CN 103806482A CN 201410102328 A CN201410102328 A CN 201410102328A CN 103806482 A CN103806482 A CN 103806482A
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CN
China
Prior art keywords
excavator
cylinder
hydraulic cylinder
control valve
auxiliary power
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Legal status (The legal status 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 status listed.)
Granted
Application number
CN201410102328.4A
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Chinese (zh)
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CN103806482B (en
Inventor
樊硕
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Priority to CN201410102328.4A priority Critical patent/CN103806482B/en
Publication of CN103806482A publication Critical patent/CN103806482A/en
Priority to PCT/CN2015/071542 priority patent/WO2015139530A1/en
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Publication of CN103806482B publication Critical patent/CN103806482B/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2271—Actuators and supports therefor and protection therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to the field of excavators and particularly relates to an auxiliary power energy-saving device of an excavator. The auxiliary power energy-saving device of the excavator comprises a double-cylinder connecting seat, a nitrogen cylinder, a hydraulic cylinder and a control valve; the nitrogen cylinder and the hydraulic cylinder are fixed on and arranged in parallel on the double-cylinder connecting seat; one end of the nitrogen cylinder, in which hydraulic oil is loaded, is connected with one end of the hydraulic cylinder through the control valve; an air filling hole is formed in the other end of the nitrogen cylinder. According to the auxiliary power energy-saving device of the excavator, the piston rod of the hydraulic cylinder is attached to the large arm of the excavator, the cylinder barrel of the hydraulic cylinder is arranged on the base of the excavator, the nitrogen cylinder is used for supplying propelling force to the hydraulic cylinder, power is controlled through the control valve, the entire device does not use the power of the engine of the excavator, and that the lifting force of the large arm of the excavator is increased under the condition of not consuming the power of the excavator is achieved. Therefore, the volume of a scraper pan and the length of the working arm are increased, and the working efficiency and the working radius are further increased.

Description

Excavator auxiliary power energy saver
Technical field
The present invention relates to excavator field, in particular to a kind of excavator auxiliary power energy saver.
Background technology
Excavator, claims again excavation machinery (excavating machinery), is to excavate higher or lower than the material that holds machine side with scraper bowl, and packs haulage vehicle into or unload the earth moving plant to rickyard.The material that excavator excavates is mainly soil, coal, silt and the Soil and Rock after pre-pine.From the development of engineering machinery in recent years, the development of excavator is relatively very fast, and excavator has become one of topmost engineering machinery in engineering construction.
Along with the quickening of people's rhythm of life, the raising that quality of life is required, also requires more and more higher to the service efficiency of excavator.Efficiency that what-the-hell could more effective raising excavator, people's way differs, and has plenty of increase engine power, in the hope of making the extension of big arm of digger and the speed of contraction be improved; Have plenty of increase dipper capacity, in the hope of can be in the time excavating each time can more than enough excavation some.These modes have all improved operating efficiency in certain degree, and still, such raising is but that to reduce the application life of excavator be cost.That is to say, increase the power of motor in increasing, also accelerated the consumption of motor, reduced the application life of motor; In having increased dipper capacity, the resistance while also having increased large arm work, simultaneously, in order to make large arm have enough power to carry out work, just must improve the power of motor, thereby aggravate the consumption of motor, reduce the application life of large arm and motor simultaneously.
Can could so how on earth in not reducing excavator application life, improve again the operating efficiency of excavator? this has become people's a new research topic.
Summary of the invention
The object of the present invention is to provide a kind of excavator auxiliary power energy saver, to solve the above problems.
A kind of excavator auxiliary power energy saver is provided in an embodiment of the present invention, has comprised twin-tub Connection Block, nitrogen cylinder, hydraulic cylinder and control valve;
Nitrogen cylinder and hydraulic cylinder are fixed and are set in parallel on twin-tub Connection Block;
One end that hydraulic oil is housed in nitrogen cylinder is connected with one end of hydraulic cylinder by control valve;
The other end of nitrogen cylinder is provided with injecting hole.
Further, control valve is connected with the control system of excavator by pilot control pipe.
Further, the two ends of hydraulic cylinder are connected in parallel by the elevating ram of the large arm of axle ear and excavator.
Further, one end that hydraulic cylinder is connected with control valve is provided with fuel outlet;
And/or,
One end that nitrogen cylinder is connected with control valve is provided with fuel outlet.
Further, hydraulic cylinder is provided with exhaust opening away from the one end being connected with control valve.
Further, on injecting hole, be provided with integrated controll block.
Further, integrated controll block comprises pressure meter, adds gas control valve and exhaust pressure relief valve.
Further, connection is to seal and is rigidly connected.
Excavator auxiliary power energy saver of the present invention, the piston rod of hydraulic cylinder is attached on the large arm of excavator, the cylinder barrel of hydraulic cylinder is arranged on the base of excavator, provide motive force by nitrogen cylinder to hydraulic cylinder, by control valve, power is controlled, whole device is the power of the motor of usage mining machine not, thereby realize in the situation that not consuming excavator power, increase the lifting force of big arm of digger, thereby the length that can increase volume and the working arm of scraper bowl, has further increased operating efficiency and the radius of clean-up.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, to the accompanying drawing of required use in the specific embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is embodiment of the present invention excavator auxiliary power energy saver structural representation.
In figure, 1: upper connecting axle ear; 2: hydraulic cylinder; 3: exhaust opening; 4: rod chamber; 5: piston rod; 6: cylinder barrel; 7: twin-tub Connection Block; 8: rodless cavity; 9: fuel outlet; 10: lower connecting axle ear; 11: pilot control pipe; 12: control valve; 13: fluid chamber; 14: nitrogen chamber; 15: nitrogen cylinder; 16: injecting hole; 17: integrated controll block.
The specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, will technical scheme of the present invention be carried out to clear, complete description below.Obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, all other embodiment that those skilled in the art obtain under the prerequisite of not making creative work, belong to the scope that the present invention protects.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
As shown in Figure 1, the invention provides excavator auxiliary power energy saver, comprise twin-tub Connection Block 7, nitrogen cylinder 15, hydraulic cylinder 2 and control valve 12;
Nitrogen cylinder 15 and hydraulic cylinder 2 are fixed and are set in parallel on twin-tub Connection Block 7;
One end that hydraulic oil is housed in nitrogen cylinder 15 is connected with one end of hydraulic cylinder 2 by control valve 12;
The other end of nitrogen cylinder 15 is provided with injecting hole 16.
Nitrogen is stable inert gas, starts to be widely used in fields such as household electrical appliances, furniture, automobiles.Nitrogen spring volume is little, elastic force is large, stroke is long, stable working, manufacture precision, long service life (1,000,000 times), spring curve is mild, and not needing pretension etc., it has the work that the conventional elastic parts such as metal spring, rubber and air cushion have been difficult to.But large-scale nitrogen spring system manufacture difficulty is large, and precision is high, and cost is high.Then use the characteristic of nitrogen to make the assembly of nitrogen and hydraulic system, nitrogen energy storage canister, i.e. nitrogen cylinder 15.The similar communicating vessel device that uses nitrogen cylinder 15 and hydraulic cylinder 2 to form, plays the auxiliary power of lifting and the recoverable effect of the gesture of decline of the equipment of excavator.
The hydraulic oil of first injecting aequum to nitrogen cylinder 15 by injecting hole 16, then inject the nitrogen of required pressure to nitrogen cylinder 15 from injecting hole 16, afterwards injecting hole 16 is sealed.
Nitrogen cylinder 15 is connected with hydraulic cylinder 2 by control valve 12, more whole device is in parallel with the large arm of excavator, but belongs to autonomous system, is not connected with excavator hydraulic system, has safety, independence, novelty and convenience.Whole device, with the passive action of large arm, can not affect excavator personnel operation.In lifting process, the high pressure nitrogen in nitrogen cylinder 15 is delivered to pressure in the rodless cavity 8 of hydraulic cylinder 2 by hydraulic oil, for large arm lifting provides auxiliary power, in the time of high power work, avoids motor because crossing the problem of sub operation generation over-emitting black exhaust.In decline process, in the situation that not affecting former excavator potential energy recovery system and the work of flow regenerative system, by nitrogen cushioning effect, the unnecessary heat energy that the potential energy further large arm being declined produces is offset, reduce the loss to the each parts of excavator, increase application life.Control valve 12 is arranged on the rodless cavity root of oil cylinder, controls flow, plays large arm and prevent falling locking effect in large arm stopped process, has very big effect for excavator work safety.
It should be noted that in whole process, the height of the hydraulic oil in nitrogen cylinder 15 will be higher than the height of the pipeline being connected with control valve 12, can make the hydraulic oil in nitrogen cylinder 15 enter smoothly in hydraulic cylinder 2.
Further, control valve 12 is connected with the control system of excavator by pilot control pipe 11.
Control valve 12 is linked together by pilot control pipe 11 and the control system of excavator, thereby can make the dynamical system perfect adaptation of whole auxiliary power energy saver and excavator.
Further, the two ends of hydraulic cylinder 2 are connected in parallel by the elevating ram of the large arm of axle ear and excavator.
The piston rod 5 of hydraulic cylinder 2 arranges upper connecting axle ear 1 on the one end away from cylinder barrel 6, and cylinder barrel 6 arranges lower connecting axle ear 10 away from one end of piston rod 5.On upper connecting axle ear 1 and the lower connecting axle ear 10 large arm by bearing pin and excavator, be connected, and be in parallel with the elevating ram on large arm, thereby hydraulic cylinder 2 is arranged on excavator.
It is pointed out that hydraulic cylinder 2 can be to be connected with excavator by axle ear, can be also to connect by other modes, as long as it can be arranged on hydraulic cylinder 2 on the large arm of excavator, and to make hydraulic cylinder 2 be that piston rod 5 moves with the action of large arm.
Further, one end that hydraulic cylinder 2 is connected with control valve 12 is provided with fuel outlet 9;
And/or,
One end that nitrogen cylinder 15 is connected with control valve 12 is provided with fuel outlet 9.
The lower end of nitrogen cylinder 15 and/or hydraulic cylinder 2, one end that hydraulic oil is housed is provided with fuel outlet 9, when whole device service time for a long time after, need to overhaul device, now, hydraulic oil in nitrogen cylinder 15 and hydraulic cylinder 2 is discharged to the maintenance being more conducive to nitrogen cylinder 15 and hydraulic cylinder 2, thereby avoid undetected place to occur.
Further, hydraulic cylinder 2 is provided with exhaust opening 3 away from the one end being connected with control valve 12.
Same reason, in the time that device is overhauled, can discharge the hydraulic oil in device by rodless cavity 8, can also the nitrogen in nitrogen cylinder be discharged by exhaust opening 3.
Exhaust opening 3 is arranged on the rod chamber 4 of hydraulic cylinder, then rod chamber 4 is communicated with the nitrogen chamber 14 of nitrogen cylinder 15 by pipeline, like this by the movement of piston rod 5, can accelerate the nitrogen in nitrogen cylinder 15 to discharge.
Further, on injecting hole 16, be provided with integrated controll block 17.
Integrated controll block 17 is set on injecting hole 16, can be to carrying out various control in nitrogen cylinder 15.As pressure, as nitrogen amount, as hydraulic pressure oil mass etc.By a series of parameter control, can more effectively know the service condition of whole auxiliary power energy saver, thus the judgement can be conducive to the various faults of device to produce time.
Further, integrated controll block 17 includes pressure meter, adds gas control valve and exhaust pressure relief valve.
Pressure is the necessary parameter that whole device uses, after the pressure in nitrogen cylinder 15 is zero, whole device just cannot play the effect of auxiliary power, just need to supplement timely power, namely the hydraulic oil oil-feed liquid chamber 13 in supplementary nitrogen cylinder 15 or the nitrogen in supplementary nitrogen cylinder 15 enter nitrogen chamber 14, thereby increase the pressure of nitrogen cylinder 15.
To add gas control valve and exhaust pressure relief valve and be arranged in integrated controll block 17, can strengthen aerating efficiency and the exhaust efficiency of nitrogen cylinder 15.
Further, connection is to seal and is rigidly connected.
Because whole device is that the pressure producing by gas and liquid carries out auxiliary movement to the large arm of excavator, therefore, the connection of each junction all needs to carry out encapsulation process, otherwise no matter be the insufficient pressure that the leakage of gas or the leakage part of hydraulic oil can cause auxiliary power energy saver, thereby can not play the effect of auxiliary power.
By being rigidly connected, whole device effectively can be combined into an entirety.
Whole device is in initial, nitrogen in nitrogen chamber 14 has pressure, in the process of upholding at the large arm of excavator, the large arm of motor driven promotes, now, the control valve 12 of the control system control auxiliary power energy saver of excavator is opened, make hydraulic oil in nitrogen cylinder 15 under the pressure-acting of nitrogen chamber 14 interior nitrogen, in the rodless cavity 8 of the hydraulic oil pressure inlet hydraulic cylinder 2 in fluid chamber 13, thereby the piston rod 5 that orders about hydraulic cylinder 2 stretches out in the cylinder barrel 6 of hydraulic cylinder 2, and auxiliary dynamic action has been played in the lifting of the large arm to excavator.
In the process declining at the large arm of excavator, large arm is because gravity reason declines, the piston rod 5 of compression hydraulic cylinder 2, in the process that piston rod 5 presses down, hydraulic oil in rodless cavity 8 is extruded, enter in the fluid chamber 13 of nitrogen cylinder 15 by connecting pipe, the hydraulic oil in fluid chamber 13 increases, nitrogen in nitrogen chamber 14 is compressed, and is extension storage pressure next time from making nitrogen.
Whole device is independent sealed environment, but in the time that long-term use causes oil sealing aging, hydraulic oil can overflow by oil sealing gap, and in the time arriving critical point, nitrogen overflows, failure of apparatus.Can install in parallelly with big arm of digger, oil cylinder oil spilling is very easy to find, can in time will device dismounting and change oil sealing.Even if fail to find in time to cause failure of apparatus, nitrogen to overflow the security system that yet can not affect excavator self, the nitrogen overflowing does not affect environment yet, and device only needs dismounting and change accessory just can continue to use, and there is no potential safety hazard.Stand-alone device makes excavator exert an influence to this device at the Shi Buhui that breaks down, and this device plays auxiliary security function can also and break down in excavator maintenance time.
Excavator auxiliary power energy saver of the present invention, the piston rod of hydraulic cylinder 2 is attached on the large arm of excavator, the cylinder barrel of hydraulic cylinder 2 is arranged on the base of excavator, improve power to hydraulic cylinder 2 by nitrogen cylinder 15, by control valve 12, power is controlled, whole device is the power of the motor of usage mining machine not, thereby realize in the situation that not consuming excavator power, increase the lifting force of big arm of digger, thereby volume and the boom length that can increase scraper bowl, further increased operating efficiency and the radius of clean-up; Simultaneously, in operation process, the gravitional force of equipment also gets the greatest degree of optimization, and does not consume extra mechanical energy, has both saved energy, has reduced again the dynamic loading that heating and the floating bearing etc. of hydraulic system are located; Under the same prerequisite of machine heavy phase, job stabilization improves, and can obtain larger operating radius or dipper capacity, and this has very important meaning to improving performance, fuel saving etc.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (8)

1. an excavator auxiliary power energy saver, is characterized in that, comprises twin-tub Connection Block, nitrogen cylinder, hydraulic cylinder and control valve;
Described nitrogen cylinder and described hydraulic cylinder are fixed and are set in parallel on described twin-tub Connection Block;
One end that hydraulic oil is housed in described nitrogen cylinder is connected with one end of described hydraulic cylinder by described control valve;
The other end of described nitrogen cylinder is provided with injecting hole.
2. excavator auxiliary power energy saver according to claim 1, is characterized in that, described control valve is connected with the control system of excavator by leading control valve.
3. excavator auxiliary power energy saver according to claim 2, is characterized in that, the two ends of described hydraulic cylinder are connected in parallel by the elevating ram of the large arm of axle ear and excavator.
4. excavator auxiliary power energy saver according to claim 3, is characterized in that, described hydraulic cylinder is provided with fuel outlet with one end that described control valve is connected;
And/or,
One end that described nitrogen cylinder is connected with control valve is provided with fuel outlet.
5. excavator auxiliary power energy saver according to claim 4, is characterized in that, described hydraulic cylinder is provided with exhaust opening away from the one end being connected with described control valve.
6. excavator auxiliary power energy saver according to claim 5, is characterized in that, is provided with integrated controll block on described injecting hole.
7. excavator auxiliary power energy saver according to claim 6, is characterized in that, described integrated controll block includes pressure meter, adds gas control valve and exhaust pressure relief valve.
8. according to the excavator auxiliary power energy saver described in claim 1-7 any one, it is characterized in that, all connections are sealing and are rigidly connected.
CN201410102328.4A 2014-03-19 2014-03-19 Auxiliary power energy-saving device of excavator Expired - Fee Related CN103806482B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201410102328.4A CN103806482B (en) 2014-03-19 2014-03-19 Auxiliary power energy-saving device of excavator
PCT/CN2015/071542 WO2015139530A1 (en) 2014-03-19 2015-01-26 Auxiliary power energy-saving device of excavator

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Application Number Priority Date Filing Date Title
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CN103806482B CN103806482B (en) 2015-02-18

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104832490A (en) * 2015-05-05 2015-08-12 樊硕 Ultrahigh-pressure nitrogen energy-saving auxiliary cylinder
WO2015139530A1 (en) * 2014-03-19 2015-09-24 樊硕 Auxiliary power energy-saving device of excavator
CN106429944A (en) * 2016-11-01 2017-02-22 沈阳双壹市政工程有限公司 Gas lifting jack for excavator
CN109372042A (en) * 2018-12-17 2019-02-22 程春雷 The hydraulic crawler excavator device that swing arm self weight is offset
EP3786368A1 (en) 2019-08-26 2021-03-03 Guangxi LiuGong Machinery Co., Ltd. Electric excavator with energy regeneration system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2588116B (en) * 2019-10-07 2022-02-23 Caterpillar Global Mining Llc Method and apparatus for operating a machine work tool
CN113494108B (en) * 2021-07-30 2022-11-08 长江生态环保集团有限公司 Scouring exploration and excavation equipment

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TWM240372U (en) * 2003-03-06 2004-08-11 Chih-Yu Li A double cylinder shock absorber
KR20090063659A (en) * 2007-12-14 2009-06-18 강대식 Hydraulic breaker with sound-absorbing mechanism
CN201695429U (en) * 2010-04-19 2011-01-05 合肥滨海工程机械有限公司 Novel hydraulic-nitrogen joint action breaking hammer
CN201801896U (en) * 2010-05-26 2011-04-20 上海金泰工程机械有限公司 Cushioning device for diaphragm wall grab
CN203741897U (en) * 2014-03-19 2014-07-30 樊硕 Auxiliary power energy saving device of excavator

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CN202324043U (en) * 2011-10-09 2012-07-11 江苏力博士机械股份有限公司 Auxiliary device for increasing hitting power of hydraulic breaking hammer
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWM240372U (en) * 2003-03-06 2004-08-11 Chih-Yu Li A double cylinder shock absorber
KR20090063659A (en) * 2007-12-14 2009-06-18 강대식 Hydraulic breaker with sound-absorbing mechanism
CN201695429U (en) * 2010-04-19 2011-01-05 合肥滨海工程机械有限公司 Novel hydraulic-nitrogen joint action breaking hammer
CN201801896U (en) * 2010-05-26 2011-04-20 上海金泰工程机械有限公司 Cushioning device for diaphragm wall grab
CN203741897U (en) * 2014-03-19 2014-07-30 樊硕 Auxiliary power energy saving device of excavator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015139530A1 (en) * 2014-03-19 2015-09-24 樊硕 Auxiliary power energy-saving device of excavator
CN104832490A (en) * 2015-05-05 2015-08-12 樊硕 Ultrahigh-pressure nitrogen energy-saving auxiliary cylinder
CN106429944A (en) * 2016-11-01 2017-02-22 沈阳双壹市政工程有限公司 Gas lifting jack for excavator
CN106429944B (en) * 2016-11-01 2019-02-15 沈阳双壹市政工程有限公司 A kind of gas lifting jack for excavator
CN109372042A (en) * 2018-12-17 2019-02-22 程春雷 The hydraulic crawler excavator device that swing arm self weight is offset
EP3786368A1 (en) 2019-08-26 2021-03-03 Guangxi LiuGong Machinery Co., Ltd. Electric excavator with energy regeneration system
US11268263B2 (en) 2019-08-26 2022-03-08 Guangxi Liugong Machinery Co., Ltd. Electric excavator

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Granted publication date: 20150218