CN102979133A - Rotary brake energy recycling device of hydraulic excavator - Google Patents
Rotary brake energy recycling device of hydraulic excavator Download PDFInfo
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- CN102979133A CN102979133A CN2012104836916A CN201210483691A CN102979133A CN 102979133 A CN102979133 A CN 102979133A CN 2012104836916 A CN2012104836916 A CN 2012104836916A CN 201210483691 A CN201210483691 A CN 201210483691A CN 102979133 A CN102979133 A CN 102979133A
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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 the 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 most normal excavation entrucking operating mode of carrying out of hydraulic crawler excavator, each working cycles has the process of twice revolving dial startup and braking, generally all is the back pressure that produces by overflow valve during the 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, there are A, the B chamber of a hydraulic motor to communicate with hydraulic fluid port (P1), (P2) of three six logical pilot operated directional control valves respectively, oil return opening (T) connected tank of three six logical pilot operated directional control valves, be connected in series an one way valve between pressure hydraulic fluid port (P) and the variable pump, the hydraulic fluid ports (Pi) that often drive into of three six logical pilot operated directional control valve metas link to each other with the Output pressure pipeline of variable pump; The hydraulic fluid port (Pj) of often leaving of three six logical pilot operated directional control valve metas links to each other with the feedback fluid-control mouth of variable pump; After two one way valves and two the overflow valve parallel connections, the B chamber of the A chamber of a termination hydraulic motor, other end access hydraulic motor; The pressure hydraulic fluid port (C) of pilot-actuated valve, (D) link to each other with pilot control hydraulic fluid port (XAs1), (XBs1) of three six logical pilot operated directional control valves respectively; When the handle wrench of guide's control valve arrives right position, its pressure hydraulic fluid port (C) output pilot pressure oil, three six logical pilot operated directional control valve main valve plugs are in right, and hydraulic crawler excavator begins to rotate; When the handle wrench of guide's control valve arrives left position, its pressure hydraulic fluid port (D) pressure oil output, three six logical pilot operated directional control valve main valve plugs are in left position, hydraulic crawler excavator backward rotation; When the handle wrench of guide's control valve during to meta, its pressure hydraulic fluid port (C), (D) be pressure oil output not all, three six logical pilot operated directional control valve main valve plugs are in meta, the A of hydraulic motor, B chamber and variable pump and fuel tank remain open state, hydraulic oil in A, the B chamber is through the overflow valve oil sump tank, and the hydraulic crawler excavator revolution stops to begin braking.
There is following shortcoming in this hydraulic crawler excavator revolution hydraulic control system: 1, the revolving dial braking moment is not enough, and revolving dial needs the long period to stop fully; 2, in the 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; When 3, revolving dial started, oneself was significantly less than setting value the hydraulic fluid pressure in the hydraulic system, and variable capacity oil pump needs work a period of time just can make the pressure of hydraulic oil in the hydraulic system be elevated to setting value, and hydraulic crawler excavator could begin to turn round operation.
Summary of the invention
The hydraulic crawler excavator rotary braking energy recycling device that the purpose of this invention is to provide a kind of energy storage recycling that produces can be with the rotary braking of hydraulic crawler excavator the time.
In order to address the above problem, the technical solution used in the present invention is:
This hydraulic crawler excavator rotary braking energy recycling device, include a hydraulic motor that drives the revolution parts, the variable pump that drive medium is provided to described hydraulic motor, between variable pump and described hydraulic motor, be connected to one and include the first pilot operated directional control valve that Median Function seals four hydraulic fluid ports simultaneously, be connected with an one way valve between first oil-in (P) of described pilot operated directional control valve and the described variable pump oil-out, the pressure hydraulic fluid port (C) of a manual pilot valve, (D) by the next hydraulic fluid port of reversal valve and the hydraulic control end (XAs1) of described pilot operated directional control valve, (XBs1) connect, pick out a pipeline in the A chamber of described hydraulic motor, two hydraulic control one-way valves that arrange in the same way of described pipeline series connection, the oil-in of described hydraulic control one-way valve links to each other with the A chamber of described hydraulic motor, pick out a pipeline in the B chamber of described hydraulic motor, two hydraulic control one-way valves that arrange in the same way of described pipeline series connection, the oil-in of described hydraulic control one-way valve links to each other with the B chamber of described hydraulic motor, the outlet docking of described pipeline, export pipeline at described hydraulic control one-way valve picks out the pipeline that a port connects accumulator, at overflow valve of described pipeline access; Between described pipeline, connect a pipeline, two hydraulic control one-way valves that oppositely arrange of serial connection on the described pipeline, the oil-out of described hydraulic control one-way valve is connected with described pipeline respectively, pick out a pipeline at the in-line of described hydraulic control one-way valve and link to each other with the oil-out of choke valve, the oil-in of described choke valve directly communicates with fuel tank; Pick out pipeline to the hydraulic control end of described hydraulic control one-way valve from the upper oil-out of described hydraulic control two position three-way valve, pick out pipeline to the hydraulic control end of described hydraulic control one-way valve from the upper oil-out of described hydraulic control two position three-way valve; Pick out pipeline to the hydraulic control end of described hydraulic control two position three-way valve from described hydraulic control one-way valve oil-out; Connect shuttle valve between the oil-out (C) of described manual pilot valve, (D), the oil-out of described shuttle valve links to each other with the hydraulic control port of described choke valve.Owing to adopted technique scheme, the present invention compared with prior art has following beneficial effect:
1, do not change the Hydraulic Elements such as hydraulic motor of the prior art and main reversing valve.
2, the increase element is less, and technology is ripe, cheap.
3, accumulator only reclaims the hydraulic motor braking energy, and does not receive the energy of existing Hydraulic slewing system output.
4, hydraulic motor starts the energy that at first uses accumulator to store, and when the energy that accumulator stores was lower than setting value, the variable pump that automaticallyes switch again output energy did not interfere with each other mutually.
Description of drawings
Fig. 1 is the hydraulic schematic diagram of prior art.
Fig. 2 is hydraulic schematic diagram of the present invention.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing embodiment:
The hydraulic schematic diagram of hydraulic crawler excavator rotary braking energy recycling device as shown in Figure 2, include a hydraulic motor 10 that drives the revolution parts, the variable pump 17 that drive medium is provided to described hydraulic motor 10, between variable pump 17 and described hydraulic motor 10, be connected to one and include the first pilot operated directional control valve 15 that Median Function seals four hydraulic fluid ports simultaneously, be connected with an one way valve 16 between first oil-in (P) of described pilot operated directional control valve 15 and described variable pump 17 oil-outs, the pressure hydraulic fluid port (C) of a manual pilot valve 2, (D) by reversal valve 4, the hydraulic control end (XAs1) of 5 the next hydraulic fluid port and described pilot operated directional control valve 15, (XBs1) connect, pick out a pipeline 21 in the A chamber of described hydraulic motor 10, two hydraulic control one-way valves 11 that arrange in the same way of described pipeline 21 series connection, 12, the oil-in of described hydraulic control one-way valve 12 links to each other with the A chamber of described hydraulic motor 10, pick out a pipeline 23 in the B chamber of described hydraulic motor 10, two hydraulic control one-way valves 8 that arrange in the same way of described pipeline 23 series connection, 9, the oil-in of described hydraulic control one-way valve 9 links to each other with the B chamber of described hydraulic motor 10, described pipeline 21,23 outlet docking, at described hydraulic control one-way valve 11, pick out the pipeline 26 that a port connects accumulator 13 on 8 the export pipeline, at overflow valve 14 of described pipeline 26 accesses; Between described pipeline 22,24, connect a pipeline 25, two hydraulic control one-way valves 6,7 that oppositely arrange of serial connection on the described pipeline 25, described hydraulic control one-way valve 6,7 oil-out are connected with described pipeline 24,22 respectively, pick out a pipeline at described hydraulic control one-way valve 6,7 in-line and link to each other with the oil-out of choke valve 3, the oil-in of described choke valve 3 directly communicates with fuel tank; Pick out pipeline to described hydraulic control one-way valve 7,9 hydraulic control end from the upper oil-out of described hydraulic control two position three-way valve 4, pick out pipeline to described hydraulic control one-way valve 12,6 hydraulic control end from the upper oil-out of described hydraulic control two position three-way valve 5; Pick out pipeline to described hydraulic control two position three-way valve 4,5 hydraulic control end from described hydraulic control one-way valve 8 oil-outs; Connect shuttle valve 1 between the oil-out (C) of described manual pilot valve 2, (D), the oil-out of described shuttle valve 1 links to each other 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 the 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 two position three-way valve 4 is lower than spring force, two position three-way valve 4 is in the next, pressure oil is by the next hydraulic control end (XAs1) that acts on three six logical pilot operated directional control valves 15 of two position three-way valve 4, the main valve plug of three six logical pilot operated directional control valves 15 is in right position, the hydraulic oil of at this moment variable pump 17 outputs is by one way valve 16, the oil-in (P) of three six logical pilot operated directional control valves 15, oil-out (P2), the B chamber that oil circuit 24 acts on hydraulic motor 10 is rotated hydraulic motor 10, hydraulic oil passes through the A chamber of hydraulic motor 10 again, oil circuit 22, the hydraulic fluid port (P1) of three six logical pilot operated directional control valves 15, oil return opening (T) is got 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 raise, at this moment, the rotating speed of hydraulic motor 10 is by the opening degree control of three six logical pilot operated directional control valve 15 main valve plugs.
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 the 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 two position three-way valve 5 is lower than spring force, two position three-way valve 5 is in the next, pressure oil is by the next hydraulic control end (XBs1) that acts on three six logical pilot operated directional control valves 15 of two position three-way valve 5, the main valve plug of three six logical pilot operated directional control valves 15 is in left position, the hydraulic oil of at this moment variable pump 17 outputs is by one way valve 16, the oil-in (P) of three six logical pilot operated directional control valves 15, oil-out (P1), the A chamber that oil circuit 22 acts on hydraulic motor 10 is rotated hydraulic motor 10, hydraulic oil passes through the B chamber of hydraulic motor 10 again, oil circuit 24, the hydraulic fluid port (P2) of three six logical pilot operated directional control valves 15, oil return opening (T) is got 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 raise, at this moment, the rotating speed of hydraulic motor 10 is by the opening degree control of three six logical pilot operated directional control valve 15 main valve plugs.
C), when hydraulic motor 10 rotates, hydraulic oil flows to the A chamber from the B chamber, when revolving dial need to be braked, manual pilot valve 2 handles turn back meta, the oil-out of shuttle valve 1 is pressure oil output not, and the hydraulic control end of choke valve 3 is inputted without hydraulic oil, and the spool of choke valve 3 is in right position under the effect of spring; Simultaneously because the pressure output (C) of manual pilot valve 2, (D) export without pressure oil, hydraulic control two position three-way valve 4,5 oil-in is also inputted without pressure oil, the hydraulic control end (XAs1) of three six logical pilot operated directional control valves 15, (XBs1) all enter without pressure oil, so the main valve plug of three six logical pilot operated directional control valves 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, the 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 settings, overflow valve 14 overflows, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of pressure simultaneously, because the inertia of hydraulic motor 10 rotates, cause the B chamber of hydraulic motor 10 to produce vacuum, the hydraulic oil in the fuel tank is by the right position of choke valve 3 like this, hydraulic control one-way valve 6 enters the B chamber of hydraulic motor 10.
D), when hydraulic motor 10 rotates, hydraulic oil flows to the B chamber from the A chamber, when revolving dial need to be braked, manual pilot valve 2 handles turn back meta, the oil-out of shuttle valve 1 is pressure oil output not, and the hydraulic control end of choke valve 3 is inputted without hydraulic oil, and the spool of choke valve 3 is in right position under the effect of spring; Simultaneously because the pressure output (C) of manual pilot valve 2, (D) export without pressure oil, hydraulic control two position three-way valve 4,5 oil-in is also inputted without pressure oil, the hydraulic control end (XAs1) of three six logical pilot operated directional control valves 15, (XBs1) all enter without pressure oil, the main valve plug of three six logical pilot operated directional control valves 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, the 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 settings, overflow valve 14 overflows, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of pressure simultaneously, because the inertia of hydraulic motor 10 rotates, cause the A chamber of hydraulic motor 10 to produce vacuum, the hydraulic oil in the fuel tank is by the right position of choke valve 3 like this, hydraulic control one-way valve 7 enters the A chamber of hydraulic motor 10.
Two, when accumulator 13 pressure are high
A), manual pilot valve 2 handle wrench are to the left side, make hydraulic fluid port (D) pressure oil output, the hydraulic oil of hydraulic fluid port (D) output acts on the hydraulic control end of 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 high, the hydraulic control end input pressure oil of hydraulic control two position three-way valve 4, hydraulic control two position three-way valve 4 is in upper, pressure oil passes through the epistatic action of two position three-way valve 4 at hydraulic control one-way valve 9, make them be in opening on 7, hydraulic control one-way valve 8,11 also are in opening under the effect of accumulator 13 pressure, like this, hydraulic oil in the accumulator 13 is by hydraulic control one-way valve 8, the 9 B chambeies that enter hydraulic motor 10 make its rotation, the hydraulic oil in the A chamber of hydraulic motor 10 is by oil circuit 22, hydraulic control one-way valve 7, choke valve 3 is got back to fuel tank, at this moment, the rotating speed of hydraulic motor 10 is by the opening degree control of choke valve 3.
B), manual pilot valve 2 handle wrench are to the right, make hydraulic fluid port (C) output oil pressure, the pressure oil of hydraulic fluid port (C) output acts on the hydraulic control end of 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 high, the hydraulic control end input pressure oil of hydraulic control two position three-way valve 5, hydraulic control two position three-way valve 5 is in upper, pressure oil passes through the epistatic action of two position three-way valve 5 at hydraulic control one-way valve 6, make them be in opening on 12, hydraulic control one-way valve 8,11 also are in opening under the effect of accumulator 13 pressure, like this, hydraulic oil in the accumulator 13 is by hydraulic control one-way valve 11, the 12 A chambeies that enter hydraulic motor 10 make its rotation, the hydraulic oil in the B chamber of hydraulic motor 10 is by oil circuit 24, hydraulic control one-way valve 6, choke valve 3 is got back to fuel tank, at this moment, the rotating speed of hydraulic motor 10 is by the opening degree control of choke valve 3.
C), when hydraulic motor 10 rotates, hydraulic oil flows to the A chamber from the B chamber, when revolving dial need to be braked, manual pilot valve 2 handles turn back meta, the oil-out of shuttle valve 1 is pressure oil output not, and the hydraulic control end of choke valve 3 is inputted without hydraulic oil, and the spool of choke valve 3 is in right position under the effect of spring; Hydraulic control two position three-way valve 4, the input of 5 hydraulic control end all are in upper from the hydraulic oil of accumulator 13, hydraulic control one- way valve 6,7,8,9,11,12 hydraulic control end can't be opened, and hydraulic control one- way valve 6,7,8,9,11,12 oppositely all is in closed condition; The hydraulic control end (XAs1) of three six logical pilot operated directional control valves 15, (XBs1) all enter without hydraulic oil, the main valve plug of three six logical pilot operated directional control valves 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, the 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 settings, overflow valve 14 overflows, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of pressure simultaneously, because the inertia of hydraulic motor 10 rotates, cause the B chamber of hydraulic motor 10 to produce vacuum, the hydraulic oil in the fuel tank is by the right position of choke valve 3 like this, 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 the B chamber from the A chamber, when revolving dial need to be braked, manual pilot valve 2 handles turn back meta, the oil-out of shuttle valve 1 is pressure oil output not, and the hydraulic control end of choke valve 3 is inputted without hydraulic oil, and the spool of choke valve 3 is in right position under the effect of spring; Hydraulic control two position three-way valve 4, the input of 5 hydraulic control end all are in upper from the hydraulic oil of accumulator 13, hydraulic control one- way valve 6,7,8,9,11,12 hydraulic control end can't be opened, and hydraulic control one- way valve 6,7,8,9,11,12 oppositely all is in closed condition; The hydraulic control end (XAs1) of three six logical pilot operated directional control valves 15, (XBs1) all enter without pressure oil, the main valve plug of three six logical pilot operated directional control valves 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, the 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 settings, overflow valve 14 overflows, the pressure of accumulator 13 keeps setting value, hydraulic motor 10 stops operating gradually under the effect of pressure simultaneously, because the inertia of hydraulic motor 10 rotates, cause the A chamber of hydraulic motor 10 to produce vacuum, the hydraulic oil in the 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 the revolving dial start-up course, taking full advantage of accumulator only provides pressure that the function of flow is not provided, platform is started fast, save all the other Hydraulic Elements of Power supply of pump, utilize what of accumulator stored energy, and then the driving of definite accumulator and opportunity of stopping, accumulator works when only needing the pressure high flow little in the revolving dial start-up course, pressure demand is low when larger to the hydraulic fluid flow rate demand after revolving dial starts, accumulator is thrown off with hydraulic motor, continues to provide flow by hydraulic pump; The advantage of patent of the present invention is simple in structure, dependable performance.
Claims (1)
1. hydraulic crawler excavator rotary braking energy recycling device, include a hydraulic motor (10) that drives the revolution parts, the variable pump (17) that drive medium is provided to described hydraulic motor (10), between described variable pump (17) and described hydraulic motor (10), be connected to one and include the first pilot operated directional control valve (15) that Median Function seals four hydraulic fluid ports simultaneously, be connected with an one way valve (16) between first oil-in (P) of described pilot operated directional control valve (15) and described variable pump (17) oil-out, it is characterized in that: the pressure hydraulic fluid port (C) of a manual pilot valve (2), (D) by reversal valve 4, the hydraulic control end (XAs1) of 5 the next hydraulic fluid port and described pilot operated directional control valve (15), (XBs1) connect, pick out a pipeline (21) in the A chamber of described hydraulic motor (10), two hydraulic control one-way valves (11) that arrange in the same way of described pipeline (21) series connection, (12), the oil-in of described hydraulic control one-way valve (12) links to each other with the A chamber of described hydraulic motor (10), pick out a pipeline (23) in the B chamber of described hydraulic motor (10), two hydraulic control one-way valves (8) that arrange in the same way of described pipeline (23) series connection, (9), the oil-in of described hydraulic control one-way valve (9) links to each other with the B chamber of described hydraulic motor (10), described pipeline (21), (23) outlet docking, in described hydraulic control one-way valve (11), (8) pick out the pipeline (26) that a port connects accumulator (13) on the export pipeline, at described pipeline (a 26) access overflow valve (14); Between described pipeline (22), (24), connect a pipeline (25), two hydraulic control one-way valve (6), (7) that oppositely arrange of the upper serial connection of described pipeline (25), the oil-out of described hydraulic control one-way valve (6), (7) is connected with described pipeline (24), (22) respectively, in-line in described hydraulic control one-way valve (6), (7) picks out a pipeline and links to each other with the oil-out of choke valve (3), and the oil-in of described choke valve (3) directly communicates with fuel tank; Pick out pipeline to the hydraulic control end of described hydraulic control one-way valve (7), (9) from the upper oil-out of described hydraulic control two position three-way valve (4), pick out pipeline to the hydraulic control end of described hydraulic control one-way valve (12), (6) from the upper oil-out of described hydraulic control two position three-way valve (5); Pick out pipeline to the hydraulic control end of described hydraulic control two position three-way valve (4), (5) from described hydraulic control one-way valve (8) oil-out; Connect shuttle valve (1) between the oil-out (C) of described manual pilot valve (2), (D), the oil-out of described shuttle valve (1) links to each other with the hydraulic control port of described choke valve (3).
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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. |