CN105370644A - Engineering machine and distribution system thereof - Google Patents

Engineering machine and distribution system thereof Download PDF

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Publication number
CN105370644A
CN105370644A CN201510855642.4A CN201510855642A CN105370644A CN 105370644 A CN105370644 A CN 105370644A CN 201510855642 A CN201510855642 A CN 201510855642A CN 105370644 A CN105370644 A CN 105370644A
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CN
China
Prior art keywords
valve
oil cylinder
distribution system
pendulum
valve oil
Prior art date
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Granted
Application number
CN201510855642.4A
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Chinese (zh)
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CN105370644B (en
Inventor
申文浩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hebei Leisa Heavy Construction Machinery Co Ltd
Original Assignee
Beiqi Foton Motor Co Ltd
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Priority to CN201510855642.4A priority Critical patent/CN105370644B/en
Publication of CN105370644A publication Critical patent/CN105370644A/en
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Publication of CN105370644B publication Critical patent/CN105370644B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71Multiple output members, e.g. multiple hydraulic motors or cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78Control of multiple output members

Abstract

The invention discloses a distribution system of an engineering machine. The distribution system of the engineering machine comprises a first swinging valve oil cylinder and a second swinging valve oil cylinder which are reverse in telescopic state and are opposite to each other, wherein a piston rod extending end of the first swinging valve oil cylinder and a piston rod extending end of the second swinging valve oil cylinder are hinged to the same end of a swinging and reversing mechanism; a rodless cavity of the first swinging valve oil cylinder and a rodless cavity of the second swinging valve oil cylinder are respectively communicated with two working oil openings of a reversing valve; a rod cavity of the first swinging valve oil cylinder is connected with an oil tank through a first throttling damper; a rod cavity of the second swinging valve oil cylinder is connected with the oil tank through a second throttling damper. Through the simple structure, the vibration and shock of the distribution system in the high-speed reversing process can be effectively solved; the stability and the reliability of the system are improved; the service life is prolonged; the development and production costs are reduced. The invention also discloses an engineering machine comprising the following distribution system.

Description

Engineering machinery and distribution system thereof
Technical field
The present invention relates to engineering machinery field, particularly relate to a kind of distribution system of engineering machinery.In addition, the invention still further relates to a kind of engineering machinery comprising above-mentioned distribution system.
Background technique
Majority has the engineering machinery of pump function, its distribution system swings changement by the extension and contraction control of pendulum valve oil cylinder and swings realization commutation, please refer to Fig. 1, Fig. 1 is the hydraulic schematic diagram of distribution system in prior art, comprise contrary and the be oppositely arranged first pendulum valve oil cylinder 1 and the second pendulum valve oil cylinder 2 of retracted position, the external part of two pendulum valve oil cylinders is made all to be articulated with the same one end swinging changement 3, the middle part and the vehicle body that swing changement 3 are hinged, the other end connects S pipe, realizes commutation by swinging S pipe.Wherein the rodless cavity of two pendulum valve oil cylinders is communicated with two actuator ports of selector valve respectively, and the rod chamber of two pendulum valve oil cylinders is communicated with fuel tank.
During work, selector valve makes high pressure oil enter the rodless cavity of the first pendulum valve oil cylinder 1 by an actuator port, promotion piston rod stretches out and promotes to swing changement 3 and swings aside, low pressure oil in rod chamber enters fuel tank, swing the piston rod retraction that changement 3 promotes the second pendulum valve oil cylinder 2 simultaneously, and make rodless cavity mesolow oil flow back to fuel tank by another actuator port of selector valve.
During commutation, selector valve commutates, high pressure oil enters the rodless cavity of the second pendulum valve oil cylinder 2 by an actuator port of selector valve, promotion piston rod stretches out and promotes to swing changement 3 and swings to opposite side, low pressure oil in rod chamber enters fuel tank, swing the piston rod retraction that changement 3 promotes the first pendulum valve oil cylinder 1 simultaneously, and make rodless cavity mesolow oil flow back to fuel tank by another actuator port of selector valve.
To-and-fro motion realizes commutation fast by the way, because turn around time requires often very short, it is the operating mode of typical instantaneous high pressure and large discharge, can along with huge hydraulic shock in commutation process, impact 3-4 times that the surge pressure caused is normal operating pressure, often damage hydraulic system components and parts, the stability of system and reliability also can be affected, system temperature raises, cause the loosening leakage of oil of vibration & noise and link, in the middle of the actual using process of engineering machinery, also occurred being similar to pumping system swing arm fracture, the fracture of pendulum valve oil cylinder one-way valve, the faults such as tilt cylinder base cracking, this all has very large relation with the reversing impact of hydraulic system.
Therefore, a kind of distribution system that can reduce reversing impact how is provided to be the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of distribution system of engineering machinery, can reversing impact be reduced.Another object of the present invention is to provide a kind of engineering machinery comprising above-mentioned distribution system, improves stability and reliability.
For solving the problems of the technologies described above, the invention provides a kind of distribution system of engineering machinery, comprise retracted position contrary and the be oppositely arranged first pendulum valve oil cylinder and the second pendulum valve oil cylinder, the piston rod external part of described first pendulum valve oil cylinder and the piston rod external part of described second pendulum valve oil cylinder are all articulated with the same one end swinging changement, rodless cavity and the rodless cavity of described second pendulum valve oil cylinder of described first pendulum valve oil cylinder are communicated with two actuator ports of selector valve respectively, the rod chamber of described first pendulum valve oil cylinder is all communicated with fuel tank with the rod chamber of described second pendulum valve oil cylinder, the rod chamber of described first pendulum valve oil cylinder is communicated with described fuel tank by first throttle damper, the rod chamber of described second pendulum valve oil cylinder is communicated with described fuel tank by second section damper.
Preferably, described first throttle damper is specially the first adjustable restrictive valve, and described second section damper is specially the second adjustable restrictive valve.
Preferably, also comprise first one-way valve in parallel with described first throttle damper, described first one-way valve allows hydraulic oil to flow to the rod chamber of described first pendulum valve oil cylinder by described fuel tank, also comprise second one-way valve in parallel with described second section damper, described second one-way valve allows hydraulic oil to flow to the rod chamber of described second pendulum valve oil cylinder by described fuel tank.
Preferably, described selector valve is specially pilot operated directional control valve, and two hydraulic control hydraulic fluid ports of institute's pilot operated directional control valve are communicated with two actuator ports of guide's solenoid directional control valve respectively.
Preferably, described pilot operated directional control valve is specially 3-position 4-way pilot operated directional control valve, and described guide's solenoid directional control valve is specially three-position four-way electromagnetic directional valve.
Preferably, also comprise relief valve, the rod chamber of described first pendulum valve oil cylinder is communicated with the filler opening of described relief valve with the oil circuit between described first throttle damper, the rod chamber of described second pendulum valve oil cylinder is communicated with the filler opening of described relief valve with the oil circuit between described second section damper, the oil outlet of described relief valve is communicated with described fuel tank.
The present invention also provides a kind of engineering machinery, comprises distribution system, and described distribution system is specially the distribution system described in above-mentioned any one.
Preferably, described engineering machinery is specially concrete mixer, Vehicle loaded pump or drags pump.
Distribution system provided by the invention, comprise retracted position contrary and the be oppositely arranged first pendulum valve oil cylinder and the second pendulum valve oil cylinder, the external part of two pendulum valve oil cylinders is made all to be articulated with the same one end swinging changement, the middle part and the vehicle body that swing changement are hinged, the other end connects S pipe, realizes commutation by swinging S pipe.Wherein the rodless cavity of the first pendulum valve oil cylinder is communicated with an actuator port of selector valve, the rodless cavity of the second pendulum valve oil cylinder is communicated with another actuator port of selector valve, the rod chamber of the first pendulum valve oil cylinder is communicated with fuel tank by first throttle damper, and the rod chamber of the second pendulum valve oil cylinder is communicated with fuel tank by second section damper.
To-and-fro motion realizes commutation fast by the way, rod chamber fluid flows back to fuel tank by throttle attenuator, forms outlet throttling loop, due to the effect of damper, improve the return oil pressure of rod chamber, serve to the effect of the piston rod retarding braking initiatively putting valve oil cylinder.Effectively solve the vibration of distribution system in high speed commutation process and impact by simple structure, improve stability and the reliability of system; And extend working life, reduce research and development and manufacture cost.
The present invention also provides a kind of engineering machinery comprising above-mentioned distribution system, and because above-mentioned distribution system has above-mentioned technique effect, above-mentioned engineering machinery also should have identical technique effect, introduces no longer in detail at this.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of distribution system in prior art;
Fig. 2 is the hydraulic schematic diagram of a kind of embodiment of distribution system provided by the present invention.
Embodiment
Core of the present invention is to provide a kind of distribution system of engineering machinery, can reduce reversing impact.Another core of the present invention is to provide a kind of engineering machinery comprising above-mentioned distribution system, improves stability and reliability.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 2, Fig. 2 is the hydraulic schematic diagram of a kind of embodiment of distribution system provided by the present invention.
In the distribution system that the specific embodiment of the invention provides, comprise contrary and the be oppositely arranged first pendulum valve oil cylinder 1 and the second pendulum valve oil cylinder 2 of retracted position, the external part of two pendulum valve oil cylinders is made all to be articulated with the same one end swinging changement 3, the middle part and the vehicle body that swing changement 3 are hinged, the other end connects S pipe, realizes commutation by swinging S pipe.Wherein the rodless cavity of the first pendulum valve oil cylinder 1 is communicated with an actuator port of selector valve, the rodless cavity of the second pendulum valve oil cylinder 2 is communicated with another actuator port of selector valve, the rod chamber of the first pendulum valve oil cylinder 1 is communicated with fuel tank by first throttle damper 4, and the rod chamber of the second pendulum valve oil cylinder 2 is communicated with fuel tank by second section damper 5.Many group pendulum valve oil cylinders can be arranged commutate simultaneously.
Particularly, first throttle damper 4 and second section damper 5 are adjustable restrictive valve, make outlet loop realize throttling adjustable, also can adopt the throttle attenuator of other types, as used definite value throttle valve, all within protection scope of the present invention.
During work, selector valve makes high pressure oil enter the rodless cavity of the first pendulum valve oil cylinder 1 by an actuator port, promotion piston rod stretches out and promotes to swing changement 3 and swings aside, low pressure oil in the rod chamber of the first pendulum valve oil cylinder 1 enters fuel tank by first throttle damper 4, swing the piston rod retraction that changement 3 promotes the second pendulum valve oil cylinder 2 simultaneously, the rod chamber of the second pendulum valve oil cylinder 2 is from fuel tank oil suction, and the low pressure oil in the rodless cavity of the second pendulum valve oil cylinder 2 flows back to fuel tank by another actuator port of selector valve.
Selector valve commutation during commutation, high pressure oil is made to enter the rodless cavity of the second pendulum valve oil cylinder 2 by an actuator port, promotion piston rod stretches out and promotes to swing changement 3 and swings to opposite side, low pressure oil in the rod chamber of the second pendulum valve oil cylinder 2 enters fuel tank by second section damper 5, swing the piston rod retraction that changement 3 promotes the first pendulum valve oil cylinder 1 simultaneously, the rod chamber of the first pendulum valve oil cylinder 1 is from fuel tank oil suction, and the low pressure oil in the rodless cavity of the first pendulum valve oil cylinder 1 flows back to fuel tank by another actuator port of selector valve.
To-and-fro motion realizes commutation fast by the way, rod chamber fluid flows back to fuel tank by throttle attenuator, forms outlet throttling loop, due to the effect of damper, improve the return oil pressure of rod chamber, serve to the effect of the piston rod retarding braking initiatively putting valve oil cylinder.Effectively solve the vibration of distribution system in high speed commutation process and impact by simple structure, improve stability and the reliability of system; And extend working life, reduce research and development and manufacture cost.
In the distribution system that the specific embodiment of the invention provides, also comprise first one-way valve 6 in parallel with first throttle damper 4, and the first one-way valve 6 allows hydraulic oil to flow to the rod chamber of the first pendulum valve oil cylinder 1 by fuel tank, and prevent hydraulic oil from flowing to fuel tank by rod chamber, also comprise second one-way valve 7 in parallel with second section damper 5, and the second one-way valve 7 allows hydraulic oil to flow to the rod chamber of the second pendulum valve oil cylinder 2 by fuel tank, and prevent hydraulic oil from flowing to fuel tank by rod chamber.By arranging one-way valve, make the hydraulic oil initiatively put in the rod chamber of valve oil cylinder can only enter fuel tank by throttle attenuator, and when being needed oil suction by the rod chamber of movable pendulum valve oil cylinder, hydraulic oil, without throttle attenuator, only enters rod chamber by one-way valve by fuel tank.Both ensure effective buffering, ensure fast absorbing oil again, visible, when one-way valve is not set, by throttle attenuator oil suction also within protection scope of the present invention.
In the distribution system that the specific embodiment of the invention provides, selector valve can be pilot operated directional control valve, and be provided with guide's solenoid directional control valve, two actuator port is communicated with two hydraulic control hydraulic fluid ports of pilot operated directional control valve respectively, particularly, pilot operated directional control valve is 3-position 4-way pilot operated directional control valve, and guide's solenoid directional control valve is three-position four-way electromagnetic directional valve.There is provided power by accumulator, and accumulator is communicated with plate variable plunger pump simultaneously.During work, plate variable plunger pump is accumulator topping up, when putting valve oil cylinder and needing commutation, first the electromagnet of guide's solenoid directional control valve obtains electric, guide's solenoid directional control valve commutates, and hydraulic control oil enters the control port of pilot operated directional control valve, and the spool promoting pilot operated directional control valve moves, make it commutate, accumulator and one put the conducting of valve oil cylinder, and fluid promotes piston and moves, and promote to swing changement and realize commutation.
In the distribution system that above-mentioned embodiment provides, relief valve 8 can also be set, the rod chamber of the first pendulum valve oil cylinder 1 is communicated with the filler opening of relief valve 8 with the oil circuit between first throttle damper 4, the rod chamber of the second pendulum valve oil cylinder 2 is communicated with the filler opening of relief valve 8 with the oil circuit between second section damper 5, the oil outlet of relief valve 8 is communicated with fuel tank.Ensure that oil circuit is in constant voltage buffering operating mode substantially, protection hydraulic element by arranging relief valve 8.
In the distribution system that the specific embodiment of the invention provides, one-way valve and relief valve 8 all can adopt the integrated layout of two-way plug-in valve, and valve core structure is simple, and be active in one's movements, good airproof performance, also can adopt other arrangements, all within protection scope of the present invention.
Except above-mentioned distribution system, the specific embodiment of the present invention also provides a kind of engineering machinery comprising above-mentioned distribution system, and the structure of other each several parts of this project machinery please refer to prior art, repeats no more herein.
Particularly, above-mentioned engineering machinery for concrete mixer, Vehicle loaded pump or can drag pump.
Above engineering machinery provided by the present invention and distribution system thereof are described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.

Claims (8)

1. the distribution system of an engineering machinery, comprise that retracted position is contrary and the be oppositely arranged first pendulum valve oil cylinder (1) and second puts valve oil cylinder (2), the piston rod external part of described first pendulum valve oil cylinder (1) and the piston rod external part of described second pendulum valve oil cylinder (2) are all articulated with the same one end swinging changement (3), rodless cavity and the rodless cavity of described second pendulum valve oil cylinder (2) of described first pendulum valve oil cylinder (1) are communicated with two actuator ports of selector valve respectively, the rod chamber of described first pendulum valve oil cylinder (1) is all communicated with fuel tank with the rod chamber of described second pendulum valve oil cylinder (2), it is characterized in that, the rod chamber of described first pendulum valve oil cylinder (1) is communicated with described fuel tank by first throttle damper (4), the rod chamber of described second pendulum valve oil cylinder (2) is communicated with described fuel tank by second section damper (5).
2. distribution system according to claim 1, is characterized in that, described first throttle damper (4) is specially the first adjustable restrictive valve, and described second section damper (5) is specially the second adjustable restrictive valve.
3. distribution system according to claim 1, it is characterized in that, also comprise first one-way valve (6) in parallel with described first throttle damper (4), described first one-way valve (6) allows hydraulic oil to flow to the rod chamber of described first pendulum valve oil cylinder (1) by described fuel tank, also comprise second one-way valve (7) in parallel with described second section damper (5), described second one-way valve (7) allows hydraulic oil to flow to the rod chamber of described second pendulum valve oil cylinder (2) by described fuel tank.
4. distribution system according to claim 1, is characterized in that, described selector valve is specially pilot operated directional control valve, and two hydraulic control hydraulic fluid ports of institute's pilot operated directional control valve are communicated with two actuator ports of guide's solenoid directional control valve respectively.
5. distribution system according to claim 4, is characterized in that, described pilot operated directional control valve is specially 3-position 4-way pilot operated directional control valve, and described guide's solenoid directional control valve is specially three-position four-way electromagnetic directional valve.
6. the distribution system according to claim 1 to 5 any one, it is characterized in that, also comprise relief valve (8), the rod chamber of described first pendulum valve oil cylinder (1) is communicated with the filler opening of described relief valve (8) with the oil circuit between described first throttle damper (4), the rod chamber of described second pendulum valve oil cylinder (2) is communicated with the filler opening of described relief valve (8) with the oil circuit between described second section damper (5), the oil outlet of described relief valve (8) is communicated with described fuel tank.
7. an engineering machinery, comprises distribution system, it is characterized in that, described distribution system is specially the distribution system described in claim 1 to 6 any one.
8. engineering machinery according to claim 7, is characterized in that, described process mechanism is specially concrete mixer, Vehicle loaded pump or drags pump.
CN201510855642.4A 2015-11-30 2015-11-30 Engineering machinery and its distribution system Active CN105370644B (en)

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CN105370644B CN105370644B (en) 2017-11-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107152397A (en) * 2017-05-19 2017-09-12 北汽福田汽车股份有限公司 Put valve oil cylinder, hydraulic system of pump and pumping equipment with it
CN114044440A (en) * 2021-11-18 2022-02-15 中铁工程装备集团有限公司 Direct duct piece lifting system and control method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041686B1 (en) * 1980-06-06 1986-04-09 Kawasaki Jukogyo Kabushiki Kaisha Hydraulic circuit arrangement
US20030172802A1 (en) * 2002-03-14 2003-09-18 Sauer-Danfoss Inc. Swing cylinder oscillation control circuit and valve for oscillating booms
US20030230010A1 (en) * 2001-09-25 2003-12-18 Eric Sharkness Hydraulic swing damping system
CN102562691A (en) * 2010-12-08 2012-07-11 西安众智惠泽光电科技有限公司 Hydraulic overflow throttling combined buffer loop for mechanical arm
CN203248453U (en) * 2013-04-24 2013-10-23 浙江工商职业技术学院 Stroke deceleration loop device
CN203394895U (en) * 2013-07-30 2014-01-15 三一汽车制造有限公司 Buffering hydraulic loop and concrete pumping device
CN204458585U (en) * 2014-12-11 2015-07-08 西安众智惠泽光电科技有限公司 Throttling buffering hydraulic control system
CN105080978A (en) * 2015-09-14 2015-11-25 太原科技大学 Design of novel rolling mill hydraulic system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041686B1 (en) * 1980-06-06 1986-04-09 Kawasaki Jukogyo Kabushiki Kaisha Hydraulic circuit arrangement
US20030230010A1 (en) * 2001-09-25 2003-12-18 Eric Sharkness Hydraulic swing damping system
US20030172802A1 (en) * 2002-03-14 2003-09-18 Sauer-Danfoss Inc. Swing cylinder oscillation control circuit and valve for oscillating booms
CN102562691A (en) * 2010-12-08 2012-07-11 西安众智惠泽光电科技有限公司 Hydraulic overflow throttling combined buffer loop for mechanical arm
CN203248453U (en) * 2013-04-24 2013-10-23 浙江工商职业技术学院 Stroke deceleration loop device
CN203394895U (en) * 2013-07-30 2014-01-15 三一汽车制造有限公司 Buffering hydraulic loop and concrete pumping device
CN204458585U (en) * 2014-12-11 2015-07-08 西安众智惠泽光电科技有限公司 Throttling buffering hydraulic control system
CN105080978A (en) * 2015-09-14 2015-11-25 太原科技大学 Design of novel rolling mill hydraulic system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107152397A (en) * 2017-05-19 2017-09-12 北汽福田汽车股份有限公司 Put valve oil cylinder, hydraulic system of pump and pumping equipment with it
CN114044440A (en) * 2021-11-18 2022-02-15 中铁工程装备集团有限公司 Direct duct piece lifting system and control method
CN114044440B (en) * 2021-11-18 2024-04-05 中铁工程装备集团有限公司 Direct type duct piece lifting system and control method

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Effective date of registration: 20200927

Address after: No.202 Xuanfu street, Xuanhua District, Zhangjiakou, Hebei Province

Patentee after: Hebei Leisa Heavy Construction Machinery Co., Ltd

Address before: 102206 Changping District City, Shahe, Sha Yang Road, Beijing

Patentee before: BEIQI FOTON MOTOR Co.,Ltd.