CN101705700A - Hydraulic hybrid power system of excavator - Google Patents
Hydraulic hybrid power system of excavator Download PDFInfo
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- CN101705700A CN101705700A CN200910172392A CN200910172392A CN101705700A CN 101705700 A CN101705700 A CN 101705700A CN 200910172392 A CN200910172392 A CN 200910172392A CN 200910172392 A CN200910172392 A CN 200910172392A CN 101705700 A CN101705700 A CN 101705700A
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- 238000006073 displacement reaction Methods 0.000 claims description 27
- 239000002828 fuel tank Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005381 potential energy Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 4
- 230000000979 retarding effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a hydraulic hybrid power system of an excavator, belonging to excavators. An engine of the hydraulic hybrid power system is sequentially and mechanically connected with a hydraulic variable output pump, a driving mechanism hydraulic pump/motor. The oil outlet port of the hydraulic variable pump is communicated with an oil inlet port of a main control valve and an oil inlet port of a second overflow valve; the main control valve is respectively communicated with a first wheel motor, a second wheel motor, a bucket arm cylinder, a bucket cylinder, and the oil inlet port and the oil outlet port of a boom cylinder; a one-way valve is respectively communicated with a fifth oil return port of the main control valve and the oil inlet port of a hydraulic motor; a swing mechanism hydraulic pump/motor is connected mechanically with a rotary table; an oil outlet port of a third two-position two-way shuttle valve is communicated with the oil inlet port of a driving mechanism hydraulic motor; and all the oil outlet ports are communicated with an oil tank. The system has the advantages of simple structure, mature technology, high reliability, low cost and stable and accurate control, and the reduction of the energy loss of a hydraulic system and capability of recycling the inertial potential energy of a swing mechanism with low oil consumption.
Description
Technical field
The present invention relates to a kind of excavator, concrete is a kind of hydraulic hybrid power system of excavator.
Background technology
Along with developing rapidly of industrial technology in the world wide, energy shortage and problem of environmental pollution also are on the rise.Hydraulic crawler excavator in the engineering machinery is because use amount is big, oil consumption is high, discharging is poor, becomes the main object of people's common concern gradually.Hydraulic crawler excavator in the course of the work, swing arm, dipper and scraper bowl swing up and down and the gyration of slew gear more frequent, and each moving component inertia is all bigger, so can discharge lot of energy during retarding braking.This part energy all consumes usually on the valve port of hydraulic valve, has not only wasted energy, also can cause the reduction of system's heating and component life.In order to reduce energy loss and system's calorific value, improve the life-span of element, energy reclaims effective measures that become the hydraulic excavator saving energy consumption reduction.Present hybrid excavator adopts the batteries to store energy mode usually, but the battery technology power density is little, make battery moment charge and discharge big electric current difficulty, cause that power-supply system efficient is low, energy reclaims not highly, and super capacitor and fuel cell exist problems such as tangible cost and technical security.
Existing excavator ubiquity high oil consumption, maximum discharge, system effectiveness is low and the inertia potential energy during retarding braking and weight potential energy are converted into thermal waste and problem such as fall.
Summary of the invention
The objective of the invention is to provide a kind of: oil consumption is low, system effectiveness is high and the hydraulic hybrid power system of the excavator that the inertia potential energy during retarding braking and weight potential energy may utilize again.
The object of the present invention is achieved like this: this hydraulic hybrid power system comprises first wheel-side motor (1), second wheel-side motor (2), bucket cylinder (3), bucket arm cylinder (4), boom cylinder (5), one way valve (6), hydraulic motor (7), first hydraulic motor (8), the first 2/2-way reversal valve (9), the second 2/2-way reversal valve (10), first overflow valve (11), hydraulic accumulator (12), pressure sensor (13), fuel tank (14), turntable (15), slew gear hydraulic pump/motor (16), the 3rd 2/2-way reversal valve (17), the 4th 2/2-way reversal valve (18), driving mechanism liquid hydraulic pump/motor (19), central controller (20), second hydraulic variable displacement pump (21), motor (22), second overflow valve (23), main control valve (24);
Motor (22) successively with hydraulic variable displacement pump (21), driving mechanism hydraulic pump/motor (19) mechanical connection, the oil-feed port of the fuel-displaced port of hydraulic variable displacement pump (21) and main control valve (24), the oil-feed port of second overflow valve (23) is communicated with, the first fuel-displaced port of main control valve (24) is communicated with the oil-feed port of first wheel-side motor (1), the first oil return port of main control valve (24) is communicated with the oil return port of first wheel-side motor (1), the second fuel-displaced port of main control valve (24) is communicated with the oil-feed port of second wheel-side motor (2), the second oil return port of main control valve (24) is communicated with the oil return port of second wheel-side motor (2), the 3rd fuel-displaced port of main control valve (24) is communicated with the oil-feed port of bucket arm cylinder (4), the 3rd oil return port of main control valve (24) is communicated with the oil return port of bucket arm cylinder (4), the 4th fuel-displaced port of main control valve (24) is communicated with the oil-feed port of bucket cylinder (3), the 4th oil return port of main control valve (24) is communicated with the oil return port of bucket cylinder (3), the 5th fuel-displaced port of main control valve (24) is communicated with the oil-feed port of boom cylinder (5), the fuel-displaced port of boom cylinder (5) is communicated with the oil-out of one way valve (6), the oil-feed port of one way valve (6) is communicated with the 5th oil return port of main control valve (24), the fuel-displaced port of one way valve (6) is communicated with the oil-feed port of hydraulic motor (7), the oil inlet end of the fuel-displaced port of hydraulic motor (7) and one way valve (6), the 5th oil return port of main control valve (24) is communicated with, the fuel-displaced port of first hydraulic variable displacement pump (8) is communicated with the oil-feed port of the first 2/2-way reversal valve (9), the oil circuit port of hydraulic accumulator (12) respectively with the fuel-displaced port of the first 2/2-way reversal valve (9), the oil-feed port of the second 2/2-way reversal valve (10), the oil-feed port of the 3rd 2/2-way reversal valve (17), the oil-feed port of first overflow valve (11) is communicated with, the fuel-displaced port of the second 2/2-way reversal valve (10) is communicated with the oil-feed port of slew gear hydraulic pump/motor (16), slew gear hydraulic pump/motor (16) and turntable (15) mechanical connection, the fuel-displaced port of the 3rd 2/2-way reversal valve (17) is communicated with the oil-feed port of driving mechanism hydraulic motor (19), the fuel-displaced port of the 4th 2/2-way reversal valve (17) is communicated with the oil-feed port of slew gear hydraulic pump/motor (16), the oil-feed port of the 4th 2/2-way reversal valve (18) is communicated with the 6th oil-feed port of main control valve (24), the fuel-displaced port of first overflow valve (14), the fuel-displaced port of second overflow valve (23), first hydraulic variable displacement pump (8), the oil-feed port of second hydraulic variable displacement pump (21), slew gear hydraulic pump/motor (16), the fuel-displaced port of driving mechanism hydraulic pump/motor (19), the fuel-displaced port of main control valve (24) is communicated with fuel tank (14), the control signal input of motor (22) is communicated with the first control signal output of central controller (20), first hydraulic variable displacement pump (8), second of the control signal input of second hydraulic variable displacement pump (21) and central controller (20), the 3rd control signal output is communicated with, the control signal input of driving mechanism hydraulic pump/motor (19) is communicated with the 4th control signal output of central controller (20), the control signal input of slew gear hydraulic pump/motor (16) is communicated with the 5th control signal output of central controller (20), the control signal input of the first 2/2-way reversal valve (9) is communicated with the 6th control signal output of central controller (20), the control signal input of the second 2/2-way reversal valve (10) is communicated with the 7th control signal output of central controller (20), the control signal input of the 3rd 2/2-way reversal valve (17) is communicated with the 8th control signal output of central controller (20), the control signal input of the 4th 2/2-way reversal valve (18) is communicated with the 9th control signal output of central controller (20), and the output signal of pressure sensor (13) is communicated with first signal input part of central controller (20).
Described central controller (20) is the PIC series monolithic.
Beneficial effect, owing to adopted such scheme, motor is connected with hydraulic pump/motor with hydraulic variable displacement pump respectively, has constituted the hydraulic hybrid drive system.The revolution of turntable is directly to be driven by the revolution hydraulic pump/motor, reclaims the inertia potential energy when braking, and has reduced the energy loss of hydraulic system.The swing arm hydraulic cylinder has increased energy-recuperation system, and the oil return of hydraulic cylinder drives hydraulic motor and drives hydraulic pump to the hydraulic accumulator pressurising, to realize the recovery of weight potential energy.Central controller is by the recovery and reuse that can realize energy that charge and discharge of control hydraulic pump/motor, hydraulic variable displacement pump and hydraulic accumulator.
(1) under the boom cylinder retraction operating mode, the central controller controls first 2/2-way reversal valve is open-minded, and under the effect of weight potential energy, the oil return of hydraulic cylinder drives hydraulic motor and drives hydraulic pump to the hydraulic accumulator pressurising, to realize the recovery of energy.
When (2) slew gear is braked, the central controller controls second 2/2-way reversal valve is open-minded, the control hydraulic pump/motor works in the pump operating mode, under the effect of inertia potential energy, to the hydraulic accumulator feedback energy, central controller is by the retro-speed of the discharge capacity control slew gear of control hydraulic pump/motor.When slew gear started once more, the central controller controls second 2/2-way reversal valve was open-minded, and the control hydraulic pump/motor works in the motor operating mode, drives slew gear work.
(3) during the complete machine operate as normal, motor is in best fuel-economy district, if bearing power is lower than the power output of motor in best fuel-economy district, central controller controls the 3rd 2/2-way opening of valves, hydraulic pump/motor works in the pump operating mode, reclaims unnecessary power; If bearing power is higher than the power output of motor in best fuel-economy district, central controller controls the 3rd 2/2-way opening of valves, hydraulic pump/motor works in the motor operating mode, replenishes remaining power; If bearing power is higher than the power output of motor in best fuel-economy district, the pressure of hydraulic accumulator is near minimum operating pressure, and central controller controls the 3rd 2/2-way valve cuts out, and hydraulic pump/motor is not worked, adjust the duty of motor, whole driving powers are provided.
Oil consumption is low, system effectiveness is high and inertia potential energy and weight potential energy during retarding braking may utilize again, has reached purpose of the present invention.
Advantage: motor provides car load required mean power, unnecessary or not enough part is used for hydraulic pump/motor absorption or compensation, has reduced the installed power of motor, can obtain bigger power output under outfit same engine situation, driving efficient height, oil consumption is low.Slew gear drives separately, and control steadily, has accurately reduced the energy loss of hydraulic system, and the inertia potential energy of recyclable slew gear.The weight potential energy at boom cylinder place can be recovered, and is used to motor that auxiliary power is provided, and reduces oil consumption, reduces exhaust emissions.The hydraulic accumulator power density is big, has solved the low problem of electric hybrid powering energy recovery rate.The hydraulic hybrid power system of while excavator also has simple in structure, technology maturation, reliability height, low cost and other advantages.
Description of drawings
Fig. 1 is the structural representation of the hydraulic hybrid power system of excavator of the present invention.
Among the figure, first wheel-side motor 1, second wheel-side motor 2, bucket cylinder 3, bucket arm cylinder 4, boom cylinder 5, one way valve 6, hydraulic motor 7, hydraulic motor 8, the first 2/2-way reversal valve 9, the second 2/2-way reversal valve 10, first overflow valve 11, hydraulic accumulator 12, pressure sensor 13, fuel tank 14, turntable 15, slew gear hydraulic pump/motor 16, the 3rd 2/2-way reversal valve 17, the 4th 2/2-way reversal valve 18, driving mechanism liquid hydraulic pump/motor 19, central controller 20, hydraulic variable displacement pump 21, motor 22, second overflow valve 23, main control valve 24.
The specific embodiment
Embodiment 1: this hydraulic hybrid power system comprises first wheel-side motor 1, second wheel-side motor 2, bucket cylinder 3, bucket arm cylinder 4, boom cylinder 5, one way valve 6, hydraulic motor 7, first hydraulic motor 8, the first 2/2-way reversal valve 9, the second 2/2-way reversal valve 10, first overflow valve 11, hydraulic accumulator 12, pressure sensor 13, fuel tank 14, turntable 15, slew gear hydraulic pump/motor 16, the 3rd 2/2-way reversal valve 17, the 4th 2/2-way reversal valve 18, driving mechanism liquid hydraulic pump/motor 19, central controller 20, second hydraulic variable displacement pump 21, motor 22, second overflow valve 23, main control valve 24;
The signal output part of described hydraulic accumulator pressure sensor 13 is communicated with first signal input part of central controller 20, judges its energy reserve by the pressure of measuring hydraulic accumulator, the energy output of reasonable distribution motor and hydraulic accumulator.
Described central controller 20 is the PIC series monolithic.
Claims (2)
1. the hydraulic hybrid power system of an excavator, it is characterized in that: this hydraulic hybrid power system comprises first wheel-side motor (1), second wheel-side motor (2), bucket cylinder (3), bucket arm cylinder (4), boom cylinder (5), one way valve (6), hydraulic motor (7), first hydraulic motor (8), the first 2/2-way reversal valve (9), the second 2/2-way reversal valve (10), first overflow valve (11), hydraulic accumulator (12), pressure sensor (13), fuel tank (14), turntable (15), slew gear hydraulic pump/motor (16), the 3rd 2/2-way reversal valve (17), the 4th 2/2-way reversal valve (18), driving mechanism liquid hydraulic pump/motor (19), central controller (20), second hydraulic variable displacement pump (21), motor (22), second overflow valve (23), main control valve (24);
Motor (22) successively with hydraulic variable displacement pump (21), driving mechanism hydraulic pump/motor (19) mechanical connection, the oil-feed port of the fuel-displaced port of hydraulic variable displacement pump (21) and main control valve (24), the oil-feed port of second overflow valve (23) is communicated with, the first fuel-displaced port of main control valve (24) is communicated with the oil-feed port of first wheel-side motor (1), the first oil return port of main control valve (24) is communicated with the oil return port of first wheel-side motor (1), the second fuel-displaced port of main control valve (24) is communicated with the oil-feed port of second wheel-side motor (2), the second oil return port of main control valve (24) is communicated with the oil return port of second wheel-side motor (2), the 3rd fuel-displaced port of main control valve (24) is communicated with the oil-feed port of bucket arm cylinder (4), the 3rd oil return port of main control valve (24) is communicated with the oil return port of bucket arm cylinder (4), the 4th fuel-displaced port of main control valve (24) is communicated with the oil-feed port of bucket cylinder (3), the 4th oil return port of main control valve (24) is communicated with the oil return port of bucket cylinder (3), the 5th fuel-displaced port of main control valve (24) is communicated with the oil-feed port of boom cylinder (5), the fuel-displaced port of boom cylinder (5) is communicated with the oil-out of one way valve (6), the oil-feed port of one way valve (6) is communicated with the 5th oil return port of main control valve (24), the fuel-displaced port of one way valve (6) is communicated with the oil-feed port of hydraulic motor (7), the oil inlet end of the fuel-displaced port of hydraulic motor (7) and one way valve (6), the 5th oil return port of main control valve (24) is communicated with, the fuel-displaced port of first hydraulic variable displacement pump (8) is communicated with the oil-feed port of the first 2/2-way reversal valve (9), the oil circuit port of hydraulic accumulator (12) respectively with the fuel-displaced port of the first 2/2-way reversal valve (9), the oil-feed port of the second 2/2-way reversal valve (10), the oil-feed port of the 3rd 2/2-way reversal valve (17), the oil-feed port of first overflow valve (11) is communicated with, the fuel-displaced port of the second 2/2-way reversal valve (10) is communicated with the oil-feed port of slew gear hydraulic pump/motor (16), slew gear hydraulic pump/motor (16) and turntable (15) mechanical connection, the fuel-displaced port of the 3rd 2/2-way reversal valve (17) is communicated with the oil-feed port of driving mechanism hydraulic motor (19), the fuel-displaced port of the 4th 2/2-way reversal valve (17) is communicated with the oil-feed port of slew gear hydraulic pump/motor (16), the oil-feed port of the 4th 2/2-way reversal valve (18) is communicated with the 6th oil-feed port of main control valve (24), the fuel-displaced port of first overflow valve (14), the fuel-displaced port of second overflow valve (23), first hydraulic variable displacement pump (8), the oil-feed port of second hydraulic variable displacement pump (21), slew gear hydraulic pump/motor (16), the fuel-displaced port of driving mechanism hydraulic pump/motor (19), the fuel-displaced port of main control valve (24) is communicated with fuel tank (14), the control signal input of motor (22) is communicated with the first control signal output of central controller (20), first hydraulic variable displacement pump (8), second of the control signal input of second hydraulic variable displacement pump (21) and central controller (20), the 3rd control signal output is communicated with, the control signal input of driving mechanism hydraulic pump/motor (19) is communicated with the 4th control signal output of central controller (20), the control signal input of slew gear hydraulic pump/motor (16) is communicated with the 5th control signal output of central controller (20), the control signal input of the first 2/2-way reversal valve (9) is communicated with the 6th control signal output of central controller (20), the control signal input of the second 2/2-way reversal valve (10) is communicated with the 7th control signal output of central controller (20), the control signal input of the 3rd 2/2-way reversal valve (17) is communicated with the 8th control signal output of central controller (20), the control signal input of the 4th 2/2-way reversal valve (18) is communicated with the 9th control signal output of central controller (20), and the output signal of pressure sensor (13) is communicated with first signal input part of central controller (20).
2. the hydraulic hybrid power system of excavator according to claim 1, it is characterized in that: described central controller (20) is the PIC series monolithic.
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| CN2009101723929A CN101705700B (en) | 2009-09-25 | 2009-09-25 | Hydraulic hybrid power system of excavator |
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| CN2009101723929A CN101705700B (en) | 2009-09-25 | 2009-09-25 | Hydraulic hybrid power system of excavator |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858094A (en) * | 2010-06-10 | 2010-10-13 | 重汽集团专用汽车公司 | Hydraulic hybrid power system of excavator |
| CN102261106A (en) * | 2011-05-17 | 2011-11-30 | 陈海波 | Electro-hydraulic control device of excavating machine and flow control method of load-sensing variable pump |
| WO2012055234A1 (en) * | 2010-10-28 | 2012-05-03 | 山河智能装备股份有限公司 | Driving and energy-recycling system for hybrid power equipment |
| CN102493517A (en) * | 2011-12-07 | 2012-06-13 | 哈尔滨工业大学 | Slewing system for hybrid hydraulic excavator and driving and braking method for slewing system |
| CN102795092A (en) * | 2012-08-02 | 2012-11-28 | 徐工集团工程机械股份有限公司 | Power distribution hydraulic hybrid power drive device and vehicle |
| CN103717808A (en) * | 2011-08-12 | 2014-04-09 | 伊顿公司 | Method and apparatus for recovering inertial energy |
| CN105421509A (en) * | 2015-11-16 | 2016-03-23 | 潍柴动力股份有限公司 | Movable arm potential energy recovery device of hybrid power excavator and hybrid power excavator |
| CN105484311A (en) * | 2016-01-16 | 2016-04-13 | 吉林大学 | Hydraulic working system of non-overflow-loss loader and control method of hydraulic working system |
| CN106840295A (en) * | 2017-01-24 | 2017-06-13 | 徐州市产品质量监督检验中心 | A kind of excavator fuel economy intelligent checking system and method |
| CN106891711A (en) * | 2017-03-16 | 2017-06-27 | 吉林大学 | Load series-parallel machine hydraulic hybrid control system and control method |
| CN110453741A (en) * | 2019-08-30 | 2019-11-15 | 清华大学 | Hybrid power bull-dozer |
| CN110803145A (en) * | 2019-11-12 | 2020-02-18 | 三一汽车制造有限公司 | Braking system of road roller, road roller and control method |
| CN111535394A (en) * | 2020-05-27 | 2020-08-14 | 上海三一重机股份有限公司 | Hydraulic control system, hydraulic oil flow control method, device and equipment |
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2009
- 2009-09-25 CN CN2009101723929A patent/CN101705700B/en active Active
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858094B (en) * | 2010-06-10 | 2016-07-06 | 中国重汽集团青岛重工有限公司 | Hydraulic hybrid power system of excavator |
| CN101858094A (en) * | 2010-06-10 | 2010-10-13 | 重汽集团专用汽车公司 | Hydraulic hybrid power system of excavator |
| WO2012055234A1 (en) * | 2010-10-28 | 2012-05-03 | 山河智能装备股份有限公司 | Driving and energy-recycling system for hybrid power equipment |
| CN102261106A (en) * | 2011-05-17 | 2011-11-30 | 陈海波 | Electro-hydraulic control device of excavating machine and flow control method of load-sensing variable pump |
| CN102261106B (en) * | 2011-05-17 | 2013-06-05 | 昆山航天智能技术有限公司 | Electro-hydraulic control device of excavating machine and flow control method of load-sensing variable pump |
| CN103717808A (en) * | 2011-08-12 | 2014-04-09 | 伊顿公司 | Method and apparatus for recovering inertial energy |
| CN102493517A (en) * | 2011-12-07 | 2012-06-13 | 哈尔滨工业大学 | Slewing system for hybrid hydraulic excavator and driving and braking method for slewing system |
| CN102795092A (en) * | 2012-08-02 | 2012-11-28 | 徐工集团工程机械股份有限公司 | Power distribution hydraulic hybrid power drive device and vehicle |
| CN102795092B (en) * | 2012-08-02 | 2015-02-18 | 徐工集团工程机械股份有限公司 | Power distribution hydraulic hybrid power drive device and vehicle |
| CN105421509A (en) * | 2015-11-16 | 2016-03-23 | 潍柴动力股份有限公司 | Movable arm potential energy recovery device of hybrid power excavator and hybrid power excavator |
| CN105421509B (en) * | 2015-11-16 | 2017-11-10 | 潍柴动力股份有限公司 | A kind of hybrid excavator movable arm potential energy retracting device and hybrid excavator |
| CN105484311A (en) * | 2016-01-16 | 2016-04-13 | 吉林大学 | Hydraulic working system of non-overflow-loss loader and control method of hydraulic working system |
| CN106840295A (en) * | 2017-01-24 | 2017-06-13 | 徐州市产品质量监督检验中心 | A kind of excavator fuel economy intelligent checking system and method |
| CN106891711A (en) * | 2017-03-16 | 2017-06-27 | 吉林大学 | Load series-parallel machine hydraulic hybrid control system and control method |
| CN106891711B (en) * | 2017-03-16 | 2024-01-05 | 吉林大学 | Series-parallel hydraulic hybrid power control system and control method for loader |
| CN110453741A (en) * | 2019-08-30 | 2019-11-15 | 清华大学 | Hybrid power bull-dozer |
| CN110803145A (en) * | 2019-11-12 | 2020-02-18 | 三一汽车制造有限公司 | Braking system of road roller, road roller and control method |
| CN110803145B (en) * | 2019-11-12 | 2021-06-15 | 三一汽车制造有限公司 | Braking system of road roller, road roller and control method |
| CN111535394A (en) * | 2020-05-27 | 2020-08-14 | 上海三一重机股份有限公司 | Hydraulic control system, hydraulic oil flow control method, device and equipment |
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Effective date of registration: 20220812 Address after: No.26 tuolanshan Road, Xuzhou Economic and Technological Development Zone, Xuzhou City, Jiangsu Province Patentee after: Jiangsu Xugong Construction Machinery Research Institute Co.,Ltd. Address before: Xugong Group Headquarters, Tuolan Mountain Road, Industrial Zone 1, Xuzhou Economic Development Zone, Xuzhou City, Jiangsu Province, 221000 Patentee before: XCMG CONSTRUCTION MACHINERY Co.,Ltd. |
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