CN103437393A - Rotation energy saving system of hydraulic excavator - Google Patents
Rotation energy saving system of hydraulic excavator Download PDFInfo
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- CN103437393A CN103437393A CN2013103905275A CN201310390527A CN103437393A CN 103437393 A CN103437393 A CN 103437393A CN 2013103905275 A CN2013103905275 A CN 2013103905275A CN 201310390527 A CN201310390527 A CN 201310390527A CN 103437393 A CN103437393 A CN 103437393A
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Abstract
The invention discloses a rotation energy saving system of a hydraulic excavator. On the basis of the existing hydraulic rotation system, a second check valve group, a three-position four-way hydraulic controlled reversing valve, a third check valve, a shuttle valve, a two-position four-way reversing valve, an energy accumulator and an air cylinder are added; when braking, a motor changes into a pump to pump the oil into the energy accumulator for storage via the second check valve group; when driving rotation, the energy accumulator supplies oil to control the motor through the three-position four-way hydraulic controlled reversing valve; the energy accumulator is of piston type, when the piston is at a low position, the piston can push the two-position four-way valve to reverse so as to open or close a control oil line from a pilot valve to a master control reversing valve and an oil line from the outlet of the master control reversing valve to the inlet of the three-position four-way hydraulic controlled reversing valve, when the piston of the energy accumulator is at a high position, all the oil ports of the two-position four-way reversing valve are closed, and when the piston of the energy accumulator moves downward to the position where the oil is to be used up, the piston pushes the valve rod of the two-position four-way reversing valve to open, the pilot oil opens the master control reversing valve to replace the energy accumulator to supply oil; thus, the braking energy is recycled and used.
Description
Technical field
The present invention relates to excavator hydraulic system, relate in particular to a kind of hydraulic crawler excavator revolution energy conserving system.
Background technology
As shown in Figure 1, hydraulic crawler excavator mainly is comprised of lower frame part 1, slewing equipment 2, top turntable 3 and equipment 4.Slewing equipment adopts the hydraulic-driven technology, by the driven by engine hydraulic pump, provides hydraulic power, drives hydraulic rotary motor to drive excavator top turntable 3 and equipment 4 rotations by reducing gear.During digging operation, general slewing equipment is in the hydraulic braking state, to guarantee that equipment carries out effective digging operation in definite position.After scraper bowl is filled in excavation, need gyration to arrive the discharge position discharging, after discharging completes, need gyration to return and excavate position.
As shown in Figure 2, be the revolution subsystem of hydraulic excavator hydraulic system.During revolution, by operated pilot valve 5, make master control reversal valve 4 be displaced to left position or right position, make working connection hydraulic oil enter and drive hydraulic motor 1 rotation through master control reversal valve 4, by reducing gear 6, drive the top turntable around gear ring 7 revolutions.During braking, master control reversal valve 4 is got back to meta, and hydraulic motor 1 becomes pump under inertia force drives, and the oil pumped is opened overload valve 3 oil returns to fuel tank, and opposite side one way valve 2 is opened the import that repairing enters motor 1, the set pressure that brake pressure now is overload valve 3.
According to statistics, the energy that rotary braking consumes accounts for operation hydraulic energy wastage in bulk or weight 20%～30%.
For energy fully energy-conservation and the recovery rotary system, the current research focus is the method that adopts hybrid power, replace rotary fluid motor with generator/motor, during braking, inertia energy is converted into power storage in battery and electric capacity through generator, the drive motor that discharges again during startup revolution, but the electric energy that braking is reclaimed is fewer than the demand of startup, so generally also need to utilize the generating of driven by engine generator to supplement the required electric energy of revolution.The shortcoming of oil electric mixed dynamic system is system complex, and cost is high, and battery or super capacitor life-span are low, and this has offset the energy-saving effect that adopts this technology to obtain to a certain extent.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of prior art, a kind of hydraulic crawler excavator revolution energy conserving system is provided.When the revolution startup, the braking ability that keep existing excavator hydraulic system are substantially constant, reach energy-efficient purpose.
The present invention is achieved through the following technical solutions:
A kind of hydraulic crawler excavator revolution energy conserving system, comprise master control reversal valve 4, overload oil compensating valve group, hydraulic motor 1, pilot control valve group, fuel tank 13;
Described overload oil compensating valve group consists of the first one way valve group and overload valve group, and described the first one way valve group comprises 2 one way valves 2, and described overload valve group comprises 2 overload valves 3;
Described pilot control valve group has comprised 2 pilot valves 5;
The import of 2 one way valves 2 of described the first one way valve group and the outlet of 2 overload valves 3 link together jointly, and with fuel tank 13, are connected again; The oil-out of 2 one way valves of this first one way valve group is the turnover working connection of connecting fluid pressure motor 1 respectively;
The oil-in of described 2 overload valves 3 is connected with the turnover working connection of hydraulic motor 1 respectively;
The P hydraulic fluid port of described master control reversal valve 4 connects oil pump, O hydraulic fluid port connected tank 13;
Described hydraulic crawler excavator revolution energy conserving system also comprises the second one way valve group, 3-position 4-way pilot operated directional control valve 9, the 3rd one way valve 7, shuttle valve 8, two-position four way change valve 12, accumulator 11, gas receiver 10;
Described the second one way valve group consists of 2 one way valves 6, the outlet of these 2 one way valves 6 is connected, also is connected with accumulator 11 cavity of resorption hydraulic fluid ports with the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve 9 again, and two imports of 2 one way valves 6 of the second one way valve group are the turnover working connection of connecting fluid pressure motors 1 respectively;
The O hydraulic fluid port of described 3-position 4-way pilot operated directional control valve 9 connects fuel tank 13, A hydraulic fluid port, B hydraulic fluid port are connected with the turnover working connection of hydraulic motor 1 respectively, the both sides hydraulic control mouth of described 3-position 4-way pilot operated directional control valve 9 is connected with the oil-out of 2 pilot valves 5 of pilot control valve group respectively, and described 3-position 4-way pilot operated directional control valve 9 its P hydraulic fluid port, O hydraulic fluid port, A hydraulic fluid port, B hydraulic fluid port when meta all seal.
2 oil-ins of described shuttle valve 8 are connected with the oil-out of 2 pilot valves 5 of pilot control valve group respectively, and the oil-out of shuttle valve 8 is connected with the O hydraulic fluid port of two-position four way change valve 12;
Described the 3rd one way valve 7 imports are connected with master control reversal valve 4 one side hydraulic control mouths, and outlet is connected with shuttle valve 8 outlets;
Described accumulator 11 is piston accumulator, comprise cylinder barrel 16 and interior piston 17 thereof, the piston 17 of take in cylinder barrel 16 is divided into epicoele 15 and cavity of resorption 18 as boundary, epicoele 15 is communicated with gas receiver 10, and the hydraulic fluid port of cavity of resorption 18 is connected with the outlet oil circuit of 2 one way valves 6 of described the second one way valve group and the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve 9;
The A hydraulic fluid port of described two-position four way change valve 12 is connected with the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve 9, the B hydraulic fluid port of two-position four way change valve 12 is connected with the hydraulic control hydraulic fluid port of master control reversal valve 4 one sides, the P hydraulic fluid port of two-position four way change valve 12 is connected with the A of master control reversal valve 4 outlet, and the O hydraulic fluid port of two-position four way change valve 12 is connected with shuttle valve 8 oil-outs;
The B hydraulic fluid port sealing of described master control reversal valve 4, the A hydraulic fluid port of master control reversal valve 4 is connected with the P hydraulic fluid port of two-position four way change valve 12, one side hydraulic control mouth of master control reversal valve 4 is connected with the oil-in of the 3rd one way valve 7 with the B hydraulic fluid port of two-position four way change valve 12, the opposite side hydraulic control mouth connected tank 13 of master control reversal valve 4, when described master control reversal valve 4 is opened under the promotion of a side hydraulic control oil, the P hydraulic fluid port of master control reversal valve 4 and the conducting of A hydraulic fluid port.
Described accumulator 11 is as a whole with two-position four way change valve 12 interlockings, and the interlocking position is for being sealed and matched;
The valve rod 19 of described two-position four way change valve 12 has a through-core hole, cavity of resorption 18 conductings of this through-core hole and accumulator 11;
The accompanying drawing explanation
Fig. 1 is the organigram of existing excavator.
Fig. 2 is existing digger revolving hydraulic system schematic diagram.
Fig. 3 is that hydraulic crawler excavator of the present invention turns round energy-conservation system architecture schematic diagram.
The accumulator 11 that Fig. 4 is hydraulic crawler excavator revolution energy conserving system of the present invention and the combination assumption diagram of two-position four way change valve 12.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figure 3, Figure 4.Hydraulic crawler excavator revolution energy conserving system of the present invention, comprise master control reversal valve 4, overload oil compensating valve group, hydraulic motor 1, pilot control valve group, fuel tank 13;
Described overload oil compensating valve group consists of the first one way valve group and overload valve group, and described the first one way valve group comprises 2 one way valves 2, and described overload valve group comprises 2 overload valves 3;
Described pilot control valve group has comprised 2 pilot valves 5;
The import of 2 one way valves 2 of described the first one way valve group and the outlet of 2 overload valves 3 link together jointly, and with fuel tank 13, are connected again; The oil-out of 2 one way valves of this first one way valve group is the turnover working connection of connecting fluid pressure motor 1 respectively;
The oil-in of described 2 overload valves 3 is connected with the turnover working connection of hydraulic motor 1 respectively;
The P hydraulic fluid port of described master control reversal valve 4 connects oil pump, O hydraulic fluid port connected tank 13;
Described hydraulic crawler excavator revolution energy conserving system also comprises the second one way valve group, 3-position 4-way pilot operated directional control valve 9, the 3rd one way valve 7, shuttle valve 8, two-position four way change valve 12, accumulator 11, gas receiver 10;
Described the second one way valve group consists of 2 one way valves 6, the outlet of these 2 one way valves 6 is connected, also is connected with accumulator 11 cavity of resorption hydraulic fluid ports with the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve 9 again, and two imports of 2 one way valves 6 of the second one way valve group are the turnover working connection of connecting fluid pressure motors 1 respectively;
The O hydraulic fluid port of described 3-position 4-way pilot operated directional control valve 9 connects fuel tank 13, A hydraulic fluid port, B hydraulic fluid port are connected with the turnover working connection of hydraulic motor 1 respectively, the both sides hydraulic control mouth of described 3-position 4-way pilot operated directional control valve 9 is connected with the oil-out of 2 pilot valves 5 of pilot control valve group respectively, and described 3-position 4-way pilot operated directional control valve 9 its P hydraulic fluid port, O hydraulic fluid port, A hydraulic fluid port, B hydraulic fluid port when meta all seal.
2 oil-ins of described shuttle valve 8 are connected with the oil-out of 2 pilot valves 5 of pilot control valve group respectively, and the oil-out of shuttle valve 8 is connected with the O hydraulic fluid port of two-position four way change valve 12;
Described the 3rd one way valve 7 imports are connected with master control reversal valve 4 one side hydraulic control mouths, and outlet is connected with shuttle valve 8 outlets;
Described accumulator 11 is piston accumulator, comprise cylinder barrel 16 and interior piston 17 thereof, the piston 17 of take in cylinder barrel 16 is divided into epicoele 15 and cavity of resorption 18 as boundary, epicoele 15 is communicated with gas receiver 10, and the hydraulic fluid port of cavity of resorption 18 is connected with the outlet oil circuit of 2 one way valves 6 of described the second one way valve group and the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve 9;
The A hydraulic fluid port of described two-position four way change valve 12 is connected with the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve 9, the B hydraulic fluid port of two-position four way change valve 12 is connected with the hydraulic control hydraulic fluid port of master control reversal valve 4 one sides, the P hydraulic fluid port of two-position four way change valve 12 is connected with the A of master control reversal valve 4 outlet, and the O hydraulic fluid port of two-position four way change valve 12 is connected with shuttle valve 8 oil-outs;
The B hydraulic fluid port sealing of described master control reversal valve 4, the A hydraulic fluid port of master control reversal valve 4 is connected with the P hydraulic fluid port of two-position four way change valve 12, one side hydraulic control mouth of master control reversal valve 4 is connected with the oil-in of the 3rd one way valve 7 with the B hydraulic fluid port of two-position four way change valve 12, the opposite side hydraulic control mouth connected tank 13 of master control reversal valve 4, when described master control reversal valve 4 is opened under the promotion of a side hydraulic control oil, the P hydraulic fluid port of master control reversal valve 4 and the conducting of A hydraulic fluid port.
Described accumulator 11 is as a whole with two-position four way change valve 12 interlockings, and the interlocking position is for being sealed and matched;
The valve rod 19 of described two-position four way change valve 12 has a through-core hole, cavity of resorption 18 conductings of this through-core hole and accumulator 11.
Operating principle of the present invention is as follows:
When revolution starts, if the piston 17 of accumulator 11 is in the next, the cavity of resorption 18 that is accumulator 11 is interior without pressure oil, the valve rod 19 of two-position four way change valve 12 under piston 17 thrusts in P, the conducting of A hydraulic fluid port and O hydraulic fluid port, the valve position of B hydraulic fluid port conducting, now, open one of them pilot valve 5 of pilot control valve group, guide oil stream is opened 3-position 4-way pilot operated directional control valve 9, also open master control reversal valve 4 simultaneously, hydraulic pump (not shown) fuel feeding is through master control reversal valve 4, two-position four way change valve 12, 3-position 4-way pilot operated directional control valve 9 enters hydraulic motor 1, CD-ROM drive motor 1 rotation, the oil that hydraulic motor 1 is discharged flows back to fuel tank 13 through the O of 3-position 4-way pilot operated directional control valve 9 hydraulic fluid port, if oil pump feed pressure is greater than the pressure of accumulator 11, in piston 17 and valve rod 19 meetings, move, the valve port of two-position four way change valve 12 is reduced, the flow and the pressure drop that through valve, flow out, and the oil in accumulator 11 can flow out, valve rod 19 is descended, therefore kept the balance of pressure and flow, make oil pump feed can not enter in a large number accumulator 11,
If the piston 17 of accumulator 11 is in upper, be to contain pressure oil in cavity of resorption 18, two-position four way change valve 6 is in valve position shown in Fig. 4, the P hydraulic fluid port of two-position four way change valve 12, the O hydraulic fluid port, the A hydraulic fluid port, the B hydraulic fluid port all seals, make guide oil not drive master control reversal valve 4 by two-position four way change valve 12, thereby master control reversal valve 4 keeps the meta state, piston 17 in accumulator 11 moves down under the compressed nitrogen of gas receiver 10 promotes, fluid in cavity of resorption 18 enters the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve 9 through oil-out, and under controlling, it drive hydraulic motor 1 to rotate, the oil that hydraulic motor 1 is discharged flows back to fuel tank 13 through the O of 3-position 4-way pilot operated directional control valve 9 hydraulic fluid port,
If the oil of the cavity of resorption 18 of accumulator 11 gradually reduces and approaches while being finished, piston 17 can promote valve rod 19 and move down, two-position four way change valve 12 is progressively opened, its P hydraulic fluid port, A hydraulic fluid port mouth are connected, O hydraulic fluid port, B hydraulic fluid port mouth are connected, oil circuit conducting by pilot valve 5 to master control reversal valve 4 hydraulic control mouths, master control reversal valve 4 is opened, and hydraulic pump can be taken over accumulator 11 and continue fuel feeding.
When rotary braking is handled, pilot valve 5 is closed, master control reversal valve 4 and 3-position 4-way pilot operated directional control valve 9 are all got back to meta and are closed oil circuit, hydraulic motor 1 becomes pump, the oil pumped is opened by oil circuit the cavity of resorption 18 that two one way valves, 6 one of them one way valve enter accumulator 11 hydraulic energy is stored, until gyration stops fully.
As long as in the cavity of resorption 18 of accumulator 11, oil is arranged, will at first use the oil in accumulator 11 cavity of resorptions 18, if the oil of accumulator 11 is finished, the valve rod 19 of two-position four way change valve 12 will replace, the oil of hydraulic pump will be taken over accumulator 11 fuel feeding, and this transfer process is continuous.
If 4 hydraulic fluid ports are closed pilot valve 5 when sealing in valve rod 19 shifting processes of two-position four way change valve 12 simultaneously, the hydraulic control mouth of master control reversal valve 4 has the pressure side can be through one way valve 7 oil returns, without pressure side by fuel tank 13 repairings, still can guarantee that master control reversal valve 4 can get back to meta automatically, guarantee handling safety.
Just can realize preferably the present invention as mentioned above.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not limited by the examples; other are any does not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitute, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (3)
1. a hydraulic crawler excavator revolution energy conserving system, comprise master control reversal valve, overload oil compensating valve group, hydraulic motor, pilot control valve group, fuel tank;
Described overload oil compensating valve group consists of the first one way valve group and overload valve group, and described the first one way valve group comprises 2 one way valves, and described overload valve group comprises 2 overload valves;
Described pilot control valve group has comprised 2 pilot valves;
The import of 2 one way valves of described the first one way valve group and the outlet of 2 overload valves link together jointly, and with fuel tank, are connected again; The oil-out of 2 one way valves of this first one way valve group is the turnover working connection of connecting fluid pressure motor respectively;
The oil-in of described 2 overload valves is connected with the turnover working connection of hydraulic motor respectively;
The P hydraulic fluid port of described master control reversal valve connects oil pump, O hydraulic fluid port connected tank;
It is characterized in that:
Described hydraulic crawler excavator revolution energy conserving system also comprises the second one way valve group, 3-position 4-way pilot operated directional control valve, the 3rd one way valve, shuttle valve, two-position four way change valve, accumulator, gas receiver;
Described the second one way valve group consists of 2 one way valves, the outlet of these 2 one way valves is connected, also is connected with accumulator cavity of resorption hydraulic fluid port with the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve again, and two imports of 2 one way valves of the second one way valve group are the turnover working connection of connecting fluid pressure motors respectively;
The O hydraulic fluid port of described 3-position 4-way pilot operated directional control valve connects fuel tank, A hydraulic fluid port, B hydraulic fluid port are connected with the turnover working connection of hydraulic motor respectively, the both sides hydraulic control mouth of described 3-position 4-way pilot operated directional control valve is connected with the oil-out of 2 pilot valves of pilot control valve group respectively, and described 3-position 4-way pilot operated directional control valve its P hydraulic fluid port, O hydraulic fluid port, A hydraulic fluid port, B hydraulic fluid port when meta all seal;
2 oil-ins of described shuttle valve are connected with the oil-out of 2 pilot valves of pilot control valve group respectively, and the oil-out of shuttle valve is connected with the O hydraulic fluid port of two-position four way change valve;
Described the 3rd check valve inlet is connected with master control reversal valve one side hydraulic control mouth, and outlet is connected with the shuttle valve outlet;
Described accumulator is piston accumulator, comprise cylinder barrel and interior piston thereof, the piston of take in cylinder barrel is divided into epicoele and cavity of resorption as boundary, epicoele is communicated with gas receiver, and the hydraulic fluid port of cavity of resorption is connected with the outlet oil circuit of 2 one way valves of described the second one way valve group and the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve;
Promote the valve rod transposition of two-position four way change valve in the descent of piston process of described accumulator, the valve rod of this two-position four way change valve is pushed to another valve position, and this another valve position is: the valve position of P hydraulic fluid port, the conducting of A hydraulic fluid port, the valve position of B hydraulic fluid port, the conducting of O hydraulic fluid port; While moving the valve rod that is separated from two-position four way change valve on piston, move the initial valve position that returns to valve on the valve rod of two-position four way change valve, this initial valve position is all valve position of sealing of P hydraulic fluid port, O hydraulic fluid port, A hydraulic fluid port, B hydraulic fluid port;
The A hydraulic fluid port of described two-position four way change valve is connected with the P hydraulic fluid port of 3-position 4-way pilot operated directional control valve, the B hydraulic fluid port of two-position four way change valve is connected with the hydraulic control hydraulic fluid port of master control reversal valve one side, the P hydraulic fluid port of two-position four way change valve is connected with the A of master control reversal valve outlet, and the O hydraulic fluid port of two-position four way change valve is connected with the shuttle valve oil-out;
The B hydraulic fluid port sealing of described master control reversal valve, the A hydraulic fluid port of master control reversal valve is connected with the P hydraulic fluid port of two-position four way change valve, one side hydraulic control mouth of master control reversal valve is connected with the oil-in of the 3rd one way valve with the B hydraulic fluid port of two-position four way change valve, the opposite side hydraulic control mouth connected tank of master control reversal valve, when described master control reversal valve is opened under the promotion of a side hydraulic control oil, the P hydraulic fluid port of master control reversal valve and the conducting of A hydraulic fluid port.
2. hydraulic crawler excavator revolution energy conserving system according to claim 1, is characterized in that, described accumulator and two-position four way change valve interlocking are as a whole, and the interlocking position is for being sealed and matched.
3. hydraulic crawler excavator revolution energy conserving system according to claim 1, is characterized in that, the valve rod of described two-position four way change valve has a through-core hole, the cavity of resorption conducting of this through-core hole and accumulator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103905275A CN103437393A (en) | 2013-08-30 | 2013-08-30 | Rotation energy saving system of hydraulic excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103905275A CN103437393A (en) | 2013-08-30 | 2013-08-30 | Rotation energy saving system of hydraulic excavator |
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| CN103437393A true CN103437393A (en) | 2013-12-11 |
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| CN2013103905275A Pending CN103437393A (en) | 2013-08-30 | 2013-08-30 | Rotation energy saving system of hydraulic excavator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105804147A (en) * | 2016-03-21 | 2016-07-27 | 山东理工大学 | Energy-saving system for revolving platform of hydraulic excavator |
| CN108978771A (en) * | 2018-06-28 | 2018-12-11 | 柳州柳工挖掘机有限公司 | Hydraulic slewing system and excavator |
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| JP2001002371A (en) * | 1999-06-25 | 2001-01-09 | Kobe Steel Ltd | Actuator drive device for construction machine |
| JP2009250361A (en) * | 2008-04-07 | 2009-10-29 | Sumitomo (Shi) Construction Machinery Co Ltd | Circuit for regenerating hydraulic cylinder operating pressure |
| CN102704524A (en) * | 2012-04-19 | 2012-10-03 | 华南理工大学 | Rotary energy saving system of hydraulic excavator |
| CN202577437U (en) * | 2012-04-19 | 2012-12-05 | 华南理工大学 | Rotary energy-saving system of hydraulic excavator |
| CN102979133A (en) * | 2012-11-26 | 2013-03-20 | 柳州柳工挖掘机有限公司 | Rotary brake energy recycling device of hydraulic excavator |
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2013
- 2013-08-30 CN CN2013103905275A patent/CN103437393A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001002371A (en) * | 1999-06-25 | 2001-01-09 | Kobe Steel Ltd | Actuator drive device for construction machine |
| JP2009250361A (en) * | 2008-04-07 | 2009-10-29 | Sumitomo (Shi) Construction Machinery Co Ltd | Circuit for regenerating hydraulic cylinder operating pressure |
| CN102704524A (en) * | 2012-04-19 | 2012-10-03 | 华南理工大学 | Rotary energy saving system of hydraulic excavator |
| CN202577437U (en) * | 2012-04-19 | 2012-12-05 | 华南理工大学 | Rotary energy-saving system of hydraulic excavator |
| CN102979133A (en) * | 2012-11-26 | 2013-03-20 | 柳州柳工挖掘机有限公司 | Rotary brake energy recycling device of hydraulic excavator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105804147A (en) * | 2016-03-21 | 2016-07-27 | 山东理工大学 | Energy-saving system for revolving platform of hydraulic excavator |
| CN105804147B (en) * | 2016-03-21 | 2017-12-01 | 山东理工大学 | A kind of hydraulic crawler excavator revolving dial energy conserving system |
| CN108978771A (en) * | 2018-06-28 | 2018-12-11 | 柳州柳工挖掘机有限公司 | Hydraulic slewing system and excavator |
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Application publication date: 20131211 |