CN102979133B - Rotary brake energy recycling device of hydraulic excavator - Google Patents
Rotary brake energy recycling device of hydraulic excavator Download PDFInfo
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- CN102979133B CN102979133B CN201210483691.6A CN201210483691A CN102979133B CN 102979133 B CN102979133 B CN 102979133B CN 201210483691 A CN201210483691 A CN 201210483691A CN 102979133 B CN102979133 B CN 102979133B
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Abstract
The invention discloses a rotary brake energy recycling device of a hydraulic excavator, and relates to the field of manufacturing engineering machineries. Cavities A, B of a hydraulic motor are respectively connected with three-position six-way pilot operated directional control valve oil ports (P1), (P2); a pipeline which is used for connecting two reverse pilot operated check valves in series is arranged between pipelines; pipelines which are used for connecting two pilot operated check valves which are arranged forwards in series are respectively connected to the cavities A, B of the hydraulic motor, a pipeline connected with an energy accumulator is arranged on the pipelines, and a liquid charging port of the energy accumulator is communicated with an overflow valve; and the oil outlets of a manual pilot valve and a shuttle valve are respectively communicated with oil inlets of two two-position three-way valves and two-position two-way valves after connecting with the pipeline, and the oil outlets of the two-position three-way valves are respectively communicated with the pilot operated ends of a three-position six-way reversing valve and a pilot operated check valve after connecting with the pipeline. The invention aims to provide a hydraulic device for recycling the abundant rotary brake energy of the hydraulic excavator, and then using the rotary brake energy for starting a rotary platform; and the device has the advantages of simple structure and reliable performance.
Description
Technical field
The present invention relates to construction machinery production technical field, especially a kind of hydraulic crawler excavator rotary braking energy recycling device with Hydraulic slewing system.
Background technology
In the excavation entrucking operating mode that hydraulic crawler excavator the most often carries out, each working cycles has the process of twice revolving dial startup and braking, is generally all the back pressure produced by overflow valve during revolving dial braking, makes rotary decelerating until stop.
Existing a kind of hydraulic crawler excavator revolution hydraulic control system, hydraulic schematic diagram as shown in Figure 1, the hydraulic fluid port (P1) of pilot operated directional control valve logical with three six, (P2) communicate respectively A, B chamber of a hydraulic motor, oil return opening (T) connected tank of three six logical pilot operated directional control valves, pressure oil port (P) be connected in series an one way valve between variable pump, the hydraulic fluid ports (Pi) that often drive into of three six logical pilot operated directional control valve metas are connected with the Output pressure pipeline of variable pump; The hydraulic fluid port (Pj) of often outputing of three six logical pilot operated directional control valve metas is connected with the feedback fluid-control mouth of variable pump; After two one way valves and two overflow valve parallel connections, the A chamber of a termination hydraulic motor, the B chamber of other end access hydraulic motor; The pressure oil port (C) of pilot-actuated valve, (D) respectively the pilot control hydraulic fluid port (XAs1) of pilot operated directional control valve logical with three six, (XBs1) are connected; When the handle wrench of pilot-actuated valve is to right position, its pressure oil port (C) exports pilot pressure oil, and three six logical pilot operated directional control valve main valve plugs are in right position, and hydraulic crawler excavator starts to rotate; When the handle wrench of pilot-actuated valve is to left position, its pressure oil port (D) pressure oil output, three six logical pilot operated directional control valve main valve plugs are in left position, and hydraulic crawler excavator rotates backward; When the handle wrench of pilot-actuated valve is to meta, its pressure oil port (C), (D) all not pressure oil output, three six logical pilot operated directional control valve main valve plugs are in meta, A, B chamber of hydraulic motor and variable pump and fuel tank remain open state, hydraulic oil in A, B chamber is through overflow valve oil sump tank, and hydraulic crawler excavator revolution stopping starts braking.
There is following shortcoming in this hydraulic crawler excavator revolution hydraulic control system: 1, revolving dial braking moment is not enough, and revolving dial needs the long period to stop completely; 2, in revolving dial braking procedure, the hydraulic oil of hydraulic system overflows back fuel tank through overflow valve, and the kinetic transformation that revolution inertia produces is that the heat energy of hydraulic oil is wasted; 3, revolving dial start time, the hydraulic fluid pressure in hydraulic system oneself be significantly less than setting value, variable capacity oil pump needs work a period of time that the pressure of hydraulic oil in hydraulic system just can be made to be elevated to setting value, and hydraulic crawler excavator could start to turn round operation.
Summary of the invention
The object of this invention is to provide a kind of can rotary braking by hydraulic crawler excavator time the hydraulic crawler excavator rotary braking energy recycling device of energy storage recycling that produces.
In order to solve the problem, the technical solution used in the present invention is:
This hydraulic crawler excavator rotary braking energy recycling device, include the hydraulic motor that drives revolution parts, one provides the variable pump of drive medium to described hydraulic motor, between variable pump and described hydraulic motor, be connected to one include the first pilot operated directional control valve that Median Function closes four hydraulic fluid ports simultaneously, an one way valve is connected with between first oil inlet P of described first pilot operated directional control valve and described variable pump oil-out, the pressure oil port C of a manual pilot valve, pressure oil port D is by the first hydraulic control two position three-way valve, the next hydraulic fluid port of the second hydraulic control two position three-way valve and the hydraulic control end XAs1 of described first pilot operated directional control valve, XBs1 connects, first pipeline is picked out in the A chamber of described hydraulic motor, described first pipeline is connected two the 5th hydraulic control one-way valve arranged in the same way, 6th hydraulic control one-way valve, the described oil-in of the 6th hydraulic control one-way valve is connected with the A chamber of described hydraulic motor, one article of the 3rd pipeline is picked out in the B chamber of described hydraulic motor, described 3rd pipeline is connected two the 3rd hydraulic control one-way valve arranged in the same way, 4th hydraulic control one-way valve, the described oil-in of the 4th hydraulic control one-way valve is connected with the B chamber of described hydraulic motor, described first pipeline, the outlet docking of the 3rd pipeline, at described 5th hydraulic control one-way valve, the export pipeline of the 3rd hydraulic control one-way valve picks out the 6th pipeline that one article of port connects accumulator, described 6th pipeline accesses an overflow valve, one article of the 5th pipeline is connected between the second pipeline, the 4th pipeline, described 5th pipeline is connected in series two the first hydraulic control one-way valve, the second hydraulic control one-way valves oppositely arranged, the oil-out of described first hydraulic control one-way valve, the second hydraulic control one-way valve is connected with described 4th pipeline, the second pipeline respectively, the in-line of described first hydraulic control one-way valve, the second hydraulic control one-way valve picks out a pipeline be connected with the oil-out of choke valve, the oil-in of described choke valve directly communicates with fuel tank, pick out the hydraulic control end of pipeline to described second hydraulic control one-way valve, the 4th hydraulic control one-way valve from the upper oil-out of described first hydraulic control two position three-way valve, pick out the hydraulic control end of pipeline to described 6th hydraulic control one-way valve, the first hydraulic control one-way valve from the upper oil-out of described second hydraulic control two position three-way valve, the hydraulic control end of pipeline to described first hydraulic control two position three-way valve, the second hydraulic control two position three-way valve is picked out from described 3rd hydraulic control one-way valve oil-out, between the pressure oil port C, pressure oil port D of described manual pilot valve, connect shuttle valve, the oil-out of described shuttle valve is connected with the hydraulic control port of described choke valve.
Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect:
1, the Hydraulic Elements such as hydraulic motor of the prior art and main reversing valve are not changed.
2, increase element less, technology is more ripe, cheap.
3, an accumulator Ethylene recov pressure motor braking energy, and the energy not receiving the output of existing Hydraulic slewing system.
4, hydraulic motor starts the energy first using accumulator to store, and when the energy that accumulator stores is lower than setting value, then the variable pump that automatically switches exports energy, does not interfere with each other mutually.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of prior art.
Fig. 2 is hydraulic schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the invention will be further described:
The hydraulic schematic diagram of hydraulic crawler excavator rotary braking energy recycling device as shown in Figure 2, include the hydraulic motor 10 that drives revolution parts, one provides the variable pump 17 of drive medium to described hydraulic motor 10, between variable pump 17 and described hydraulic motor 10, be connected to one include the first pilot operated directional control valve 15 that Median Function closes four hydraulic fluid ports simultaneously, an one way valve 16 is connected with between first oil-in (P) of described first pilot operated directional control valve 15 and described variable pump 17 oil-out, the pressure oil port (C) of a manual pilot valve 2, (D) by the first hydraulic control two position three-way valve 4, the next hydraulic fluid port of the second hydraulic control two position three-way valve 5 and the hydraulic control end (XAs1) of described first pilot operated directional control valve 15, (XBs1) connect, a pipeline 21 is picked out in the A chamber of described hydraulic motor 10, described pipeline 21 is connected two hydraulic control one-way valves arranged in the same way 11, 12, the oil-in of described hydraulic control one-way valve 12 is connected with the A chamber of described hydraulic motor 10, a pipeline 23 is picked out in the B chamber of described hydraulic motor 10, described pipeline 23 is connected two hydraulic control one-way valves arranged in the same way 8, 9, the oil-in of described hydraulic control one-way valve 9 is connected with the B chamber of described hydraulic motor 10, described pipeline 21, the outlet docking of 23, at described hydraulic control one-way valve 11, the export pipeline of 8 picks out the pipeline 26 that a port connects accumulator 13, described pipeline 26 accesses an overflow valve 14, a pipeline 25 is connected between described pipeline 22,24, described pipeline 25 is connected in series two hydraulic control one-way valves 6,7 oppositely arranged, the oil-out of described hydraulic control one-way valve 6,7 is connected with described pipeline 24,22 respectively, the in-line of described hydraulic control one-way valve 6,7 picks out a pipeline be connected with the oil-out of choke valve 3, the oil-in of described choke valve 3 directly communicates with fuel tank, pick out the hydraulic control end of pipeline to described hydraulic control one-way valve 7,9 from the upper oil-out of described first hydraulic control two position three-way valve 4, pick out the hydraulic control end of pipeline to described hydraulic control one-way valve 12,6 from the upper oil-out of described second hydraulic control two position three-way valve 5, the hydraulic control end of pipeline to described first hydraulic control two position three-way valve 4, second hydraulic control two position three-way valve 5 is picked out from described hydraulic control one-way valve 8 oil-out, between the oil-out (C), (D) of described manual pilot valve 2, connect shuttle valve 1, the oil-out of described shuttle valve 1 is connected with the hydraulic control port of described choke valve 3.
The explanation of hydraulic crawler excavator rotary braking energy recycling device hydraulic principle
One, when accumulator 13 pressure is low
A), the handle wrench of manual pilot valve 2 is to the left side, make hydraulic fluid port (D) pressure oil output, pressure oil acts on choke valve 3 by the oil-out of shuttle valve 1 on the one hand, choke valve 3 is in left position, on the other hand because the pressure of accumulator 13 is low, the hydraulic control end pressure of the first hydraulic control two position three-way valve 4 is lower than spring force, first hydraulic control two position three-way valve 4 is in bottom, pressure oil acts on the hydraulic control end (XAs1) of the first pilot operated directional control valve 15 by the bottom of two position three-way valve 4, the main valve plug of the first pilot operated directional control valve 15 is in right position, at this moment the hydraulic oil that variable pump 17 exports passes through one way valve 16, the oil-in (P) of the first pilot operated directional control valve 15, oil-out (P2), the B chamber that oil circuit 24 acts on hydraulic motor 10 makes hydraulic motor 10 rotate, hydraulic oil is again by the A chamber of hydraulic motor 10, oil circuit 22, the hydraulic fluid port (P1) of the first pilot operated directional control valve 15, oil return opening (T) gets back to fuel tank, unnecessary hydraulic oil is by hydraulic control one-way valve 9, hydraulic control one-way valve 8 enters accumulator 13, the pressure of accumulator 13 is raised, now, the rotating speed of hydraulic motor 10 is controlled by the opening degree of the first pilot operated directional control valve 15 main valve plug.
B), the handle wrench of manual pilot valve 2 is to the right, make hydraulic fluid port (C) pressure oil output, pressure oil acts on choke valve 3 by the oil-out of shuttle valve 1 on the one hand, choke valve 3 is in left position, on the other hand because the pressure of accumulator 13 is low, the hydraulic control end pressure of the second hydraulic control two position three-way valve 5 is lower than spring force, second hydraulic control two position three-way valve 5 is in bottom, pressure oil acts on the hydraulic control end (XBs1) of the first pilot operated directional control valve 15 by the bottom of the second hydraulic control two position three-way valve 5, the main valve plug of the first pilot operated directional control valve 15 is in left position, at this moment the hydraulic oil that variable pump 17 exports passes through one way valve 16, the oil-in (P) of the first pilot operated directional control valve 15, oil-out (P1), the A chamber that oil circuit 22 acts on hydraulic motor 10 makes hydraulic motor 10 rotate, hydraulic oil is again by the B chamber of hydraulic motor 10, oil circuit 24, the hydraulic fluid port (P2) of the first pilot operated directional control valve 15, oil return opening (T) gets back to fuel tank, unnecessary hydraulic oil is by hydraulic control one-way valve 12, hydraulic control one-way valve 11 enters accumulator 13, the pressure of accumulator 13 is raised, now, the rotating speed of hydraulic motor 10 is controlled by the opening degree of the first pilot operated directional control valve 15 main valve plug.
C), when hydraulic motor 10 rotates, hydraulic oil flows to A chamber from B chamber, when revolving dial needs to brake, manual pilot valve 2 handle turns back meta, the oil-out not pressure oil output of shuttle valve 1, the hydraulic control end of choke valve 3 inputs without hydraulic oil, and the spool of choke valve 3 is in right position under the action of the spring, simultaneously due to the pressure output (C) of manual pilot valve 2, (D) export without pressure oil, first hydraulic control two position three-way valve 4, the oil-in of the second hydraulic control two position three-way valve 5 also inputs without pressure oil, the hydraulic control end (XAs1) of the first pilot operated directional control valve 15, (XBs1) all enter without pressure oil, so the main valve plug of the first pilot operated directional control valve 15 is in meta, its hydraulic fluid port (P1), (P2) all with variable pump 17, fuel tank is in off state, hydraulic motor 10 is rotated further under the effect of inertia, A cavity pressure continues to raise, pressure oil is by hydraulic control one-way valve 12, 11 enter and are in accumulator 13, accumulator 13 is in pressure-increasning state, when the pressure of accumulator 13 is raised to the force value of overflow valve 14 setting, overflow valve 14 overflow, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of the pressure simultaneously, due to the free-wheel of hydraulic motor 10, the B chamber of hydraulic motor 10 is caused to produce vacuum, hydraulic oil in such fuel tank is by the right position of choke valve 3, hydraulic control one-way valve 6 enters the B chamber of hydraulic motor 10.
D), when hydraulic motor 10 rotates, hydraulic oil flows to B chamber from A chamber, when revolving dial needs to brake, manual pilot valve 2 handle turns back meta, the oil-out not pressure oil output of shuttle valve 1, the hydraulic control end of choke valve 3 inputs without hydraulic oil, and the spool of choke valve 3 is in right position under the action of the spring, simultaneously due to the pressure output (C) of manual pilot valve 2, (D) export without pressure oil, first hydraulic control two position three-way valve 4, the oil-in of the second hydraulic control two position three-way valve 5 also inputs without pressure oil, the hydraulic control end (XAs1) of the first pilot operated directional control valve 15, (XBs1) all enter without pressure oil, the main valve plug of the first pilot operated directional control valve 15 is in meta, its hydraulic fluid port (P1), (P2) all with variable pump 17, fuel tank is in off state, hydraulic motor 10 is rotated further under the effect of inertia, B cavity pressure continues to raise, pressure oil is by hydraulic control one-way valve 9, 8 enter and are in accumulator 13, accumulator 13 is in pressure-increasning state, when the pressure of accumulator 13 is raised to the force value of overflow valve 14 setting, overflow valve 14 overflow, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of the pressure simultaneously, due to the free-wheel of hydraulic motor 10, the A chamber of hydraulic motor 10 is caused to produce vacuum, hydraulic oil in such fuel tank is by the right position of choke valve 3, hydraulic control one-way valve 7 enters the A chamber of hydraulic motor 10.
Two, when accumulator 13 pressure height
A), manual pilot valve 2 handle wrench to the left side, make hydraulic fluid port (D) pressure oil output, the hydraulic oil that on the one hand hydraulic fluid port (D) exports acts on the hydraulic control end of choke valve 3 by the oil-out of shuttle valve 1, choke valve 3 is in left position, on the other hand because the pressure of accumulator 13 is high, the hydraulic control end input pressure oil of the first hydraulic control two position three-way valve 4, first hydraulic control two position three-way valve 4 is in upper, pressure oil passes through the epistatic action of the first hydraulic control two position three-way valve 4 at hydraulic control one-way valve 9, them are made to be in opening on 7, hydraulic control one-way valve 8, 11 are also in opening under the effect of accumulator 13 pressure, like this, hydraulic oil in accumulator 13 is by hydraulic control one-way valve 8, the 9 B chambeies entering hydraulic motor 10 make it rotate, the hydraulic oil in the A chamber of hydraulic motor 10 is by oil circuit 22, hydraulic control one-way valve 7, fuel tank got back to by choke valve 3, now, the rotating speed of hydraulic motor 10 is controlled by the opening degree of choke valve 3.
B), manual pilot valve 2 handle wrench to the right, make hydraulic fluid port (C) output oil pressure, the pressure oil that on the one hand hydraulic fluid port (C) exports acts on the hydraulic control end of choke valve 3 by the oil-out of shuttle valve 1, choke valve 3 is in left position, on the other hand because the pressure of accumulator 13 is high, the hydraulic control end input pressure oil of the second hydraulic control two position three-way valve 5, second hydraulic control two position three-way valve 5 is in upper, pressure oil passes through the epistatic action of the second hydraulic control two position three-way valve 5 at hydraulic control one-way valve 6, them are made to be in opening on 12, hydraulic control one-way valve 8, 11 are also in opening under the effect of accumulator 13 pressure, like this, hydraulic oil in accumulator 13 is by hydraulic control one-way valve 11, the 12 A chambeies entering hydraulic motor 10 make it rotate, the hydraulic oil in the B chamber of hydraulic motor 10 is by oil circuit 24, hydraulic control one-way valve 6, fuel tank got back to by choke valve 3, now, the rotating speed of hydraulic motor 10 is controlled by the opening degree of choke valve 3.
C), when hydraulic motor 10 rotates, hydraulic oil flows to A chamber from B chamber, when revolving dial needs to brake, manual pilot valve 2 handle turns back meta, the oil-out not pressure oil output of shuttle valve 1, the hydraulic control end of choke valve 3 inputs without hydraulic oil, and the spool of choke valve 3 is in right position under the action of the spring, the hydraulic oil that the hydraulic control end of the first hydraulic control two position three-way valve 4, second hydraulic control two position three-way valve 5 inputs from accumulator 13 is all in upper, the hydraulic control end of hydraulic control one-way valve 6,7,8,9,11,12 cannot be opened, and hydraulic control one-way valve 6,7,8,9,11,12 is oppositely all in closed condition, the hydraulic control end (XAs1) of the first pilot operated directional control valve 15, (XBs1) all enter without hydraulic oil, the main valve plug of the first pilot operated directional control valve 15 is in meta, its hydraulic fluid port (P1), (P2) all with variable pump 17, fuel tank is in off state, hydraulic motor 10 is rotated further under the effect of inertia, A cavity pressure continues to raise, pressure oil is by hydraulic control one-way valve 12, 11 enter and are in accumulator 13, accumulator 13 is in pressure-increasning state, when the pressure of accumulator 13 is raised to the force value of overflow valve 14 setting, overflow valve 14 overflow, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of the pressure simultaneously, due to the free-wheel of hydraulic motor 10, the B chamber of hydraulic motor 10 is caused to produce vacuum, hydraulic oil in such fuel tank is by the right position of choke valve 3, hydraulic control one-way valve 6, oil circuit 24 enters the B chamber of hydraulic motor 10.
D), when hydraulic motor 10 rotates, hydraulic oil flows to B chamber from A chamber, when revolving dial needs to brake, manual pilot valve 2 handle turns back meta, the oil-out not pressure oil output of shuttle valve 1, the hydraulic control end of choke valve 3 inputs without hydraulic oil, and the spool of choke valve 3 is in right position under the action of the spring, the hydraulic oil that the hydraulic control end of the first hydraulic control two position three-way valve 4, second hydraulic control two position three-way valve 5 inputs from accumulator 13 is all in upper, the hydraulic control end of hydraulic control one-way valve 6,7,8,9,11,12 cannot be opened, and hydraulic control one-way valve 6,7,8,9,11,12 is oppositely all in closed condition, the hydraulic control end (XAs1) of the first pilot operated directional control valve 15, (XBs1) all enter without pressure oil, the main valve plug of the second pilot operated directional control valve 15 is in meta, its hydraulic fluid port (P1), (P2) all with variable pump 17, fuel tank is in off state, hydraulic motor 10 continues to rotate counterclockwise under the effect of inertia, B cavity pressure continues to raise, pressure oil is by hydraulic control one-way valve 9, 8 enter and are in accumulator 13, accumulator 13 is in pressure-increasning state, when the pressure of accumulator 13 is raised to the force value of overflow valve 14 setting, overflow valve 14 overflow, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of the pressure simultaneously, due to the free-wheel of hydraulic motor 10, the A chamber of hydraulic motor 10 is caused to produce vacuum, hydraulic oil in fuel tank is by the right position of choke valve 3, hydraulic control one-way valve 7, oil circuit 22 enters the A chamber of hydraulic motor 10.
Rotary braking energy recycling device of the present invention, in revolving dial start-up course, making full use of accumulator only provides pressure not provide the function of flow, platform is started fast, save all the other Hydraulic Elements of Power supply of pump, utilize the number of accumulator stored energy, and then determine the driving of accumulator and the opportunity of stopping, accumulator works when only needing pressure high flow little in revolving dial start-up course, when revolving dial start after pressure demand lower larger to hydraulic fluid flow rate demand time, accumulator is thrown off with hydraulic motor, continued to provide flow by hydraulic pump, the advantage of patent of the present invention is that structure is simple, dependable performance.
Claims (1)
1. a hydraulic crawler excavator rotary braking energy recycling device, include the hydraulic motor (10) that drives revolution parts, one provides the variable pump (17) of drive medium to described hydraulic motor (10), between described variable pump (17) and described hydraulic motor (10), be connected to one include the first pilot operated directional control valve (15) that Median Function closes four hydraulic fluid ports simultaneously, an one way valve (16) is connected with between first oil inlet P of described first pilot operated directional control valve (15) and described variable pump (17) oil-out, it is characterized in that: the pressure oil port C of a manual pilot valve (2), pressure oil port D is by the first hydraulic control two position three-way valve (4), the next hydraulic fluid port of the second hydraulic control two position three-way valve (5) and the hydraulic control end XAs1 of described first pilot operated directional control valve (15), XBs1 connects, first pipeline (21) is picked out in the A chamber of described hydraulic motor (10), described first pipeline (21) series connection two the 5th hydraulic control one-way valves (11) arranged in the same way, 6th hydraulic control one-way valve (12), the oil-in of described 6th hydraulic control one-way valve (12) is connected with the A chamber of described hydraulic motor (10), one article of the 3rd pipeline (23) is picked out in the B chamber of described hydraulic motor (10), described 3rd pipeline (23) series connection two the 3rd hydraulic control one-way valves (8) arranged in the same way, 4th hydraulic control one-way valve (9), the oil-in of described 4th hydraulic control one-way valve (9) is connected with the B chamber of described hydraulic motor (10), described first pipeline (21), the outlet docking of the 3rd pipeline (23), at described 5th hydraulic control one-way valve (11), the export pipeline of the 3rd hydraulic control one-way valve (8) picks out the 6th pipeline (26) that one article of port connects accumulator (13), the upper access overflow valve (14) of described 6th pipeline (26), in the second pipeline (22), one article of the 5th pipeline (25) is connected between 4th pipeline (24), the first hydraulic control one-way valve (6) that the upper serial connection two of described 5th pipeline (25) is oppositely arranged, second hydraulic control one-way valve (7), described first hydraulic control one-way valve (6), the oil-out of the second hydraulic control one-way valve (7) respectively with described 4th pipeline (24), second pipeline (22) connects, described first hydraulic control one-way valve (6), the in-line of the second hydraulic control one-way valve (7) picks out a pipeline to be connected with the oil-out of choke valve (3), the oil-in of described choke valve (3) directly communicates with fuel tank, pick out the hydraulic control end of pipeline to described second hydraulic control one-way valve (7), the 4th hydraulic control one-way valve (9) from the upper oil-out of described first hydraulic control two position three-way valve (4), pick out the hydraulic control end of pipeline to described 6th hydraulic control one-way valve (12), the first hydraulic control one-way valve (6) from the upper oil-out of described second hydraulic control two position three-way valve (5), the hydraulic control end of pipeline to described first hydraulic control two position three-way valve (4), the second hydraulic control two position three-way valve (5) is picked out from described 3rd hydraulic control one-way valve (8) oil-out, between the pressure oil port C, pressure oil port D of described manual pilot valve (2), connect shuttle valve (1), the oil-out of described shuttle valve (1) is connected with the hydraulic control port of described choke valve (3).
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| CN201210483691.6A CN102979133B (en) | 2012-11-26 | 2012-11-26 | Rotary brake energy recycling device of hydraulic excavator |
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| CN201210483691.6A CN102979133B (en) | 2012-11-26 | 2012-11-26 | Rotary brake energy recycling device of hydraulic excavator |
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- 2012-11-26 CN CN201210483691.6A patent/CN102979133B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912136A (en) * | 2015-05-28 | 2015-09-16 | 潍柴动力股份有限公司 | Excavator and rotational hydraulic system thereof |
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| CN102979133A (en) | 2013-03-20 |
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Address after: Pull the the Liujiang River city Liuzhou County town Shuangyong road 545100 the Guangxi Zhuang Autonomous Region Patentee after: Liugong Machinery Co., Ltd. Patentee after: LIUGONG CHANGZHOU MACHINERY CO., LTD. Patentee after: Guangxi Liugong Machinery Co., Ltd. Address before: Pull the the Liujiang River city Liuzhou County town Shuangyong road 545100 the Guangxi Zhuang Autonomous Region Patentee before: Liugong Machinery Co., Ltd. Patentee before: Liugong Changzhou Excvavtor Co., Ltd. Patentee before: Guangxi Liugong Machinery Co., Ltd. |