CN210599687U - Digital control hydraulic working system of loader - Google Patents
Digital control hydraulic working system of loader Download PDFInfo
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- CN210599687U CN210599687U CN201921716373.3U CN201921716373U CN210599687U CN 210599687 U CN210599687 U CN 210599687U CN 201921716373 U CN201921716373 U CN 201921716373U CN 210599687 U CN210599687 U CN 210599687U
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- 239000012530 fluid Substances 0.000 claims abstract description 42
- 230000009471 action Effects 0.000 claims abstract description 15
- 238000010521 absorption reaction Methods 0.000 claims abstract 2
- 238000007667 floating Methods 0.000 claims description 26
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 162
- 239000010720 hydraulic oil Substances 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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Abstract
The utility model relates to a loader hydraulic control technical field specifically is a loader digital control hydraulic pressure operating system, including variable pump, valve block, first servo valve, second servo valve and programmable controller, the oil inlet of variable pump and the oil absorption mouth fluid connection of oil tank, the P mouth of valve block and the oil-out fluid connection of variable pump, the P1 mouth of valve block and the oil inlet (5P) fluid connection of first servo valve, programmable controller's input is connected with the control handle through the circuit, control handle locates driver's cabin seat next door. The utility model has the advantages that: the load sensing technology is adopted to dynamically track the flow and pressure changes in the hydraulic system, so that the flow and pressure of the hydraulic pump are output according to actual needs, and energy is saved; the digital feedback servo valve and a PLC (programmable logic controller) are adopted for computer control, so that the action sensitivity of the hydraulic valve is ensured, and the action of the oil cylinder is accurately controlled.
Description
Technical Field
The utility model relates to a loader hydraulic control technical field specifically is a loader digital control hydraulic pressure operating system.
Background
The loader is an earth and stone construction machine widely applied to the aspects of building industry, foundation construction and the like, and a hydraulic working system of the loader has the function of controlling the extension of a piston rod of a hydraulic oil cylinder to drive a movable arm and a bucket to move so as to complete actions of digging, lifting, descending, upturning, downturning, position keeping and the like. The traditional control mode of the loader working hydraulic system is to control the distribution of pressure oil of the multi-way valve by operating the flexible shaft, and the hydraulic system has the advantages of simple control mode, reliable work, low cost, large energy loss, large operating force and high operating intensity of a driver. With the development of the loader industry, the energy-saving requirement on the loader is higher and higher, and therefore, how to design an efficient and energy-saving hydraulic working system applied to the loader becomes a difficult problem to be solved urgently by the technical staff.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a loader digital control hydraulic pressure work system uses the digital control technique on loader hydraulic pressure work system, reaches and improves the complete machine performance, promotes the operating efficiency, reduces energy consumption, promotes and drives the travelling comfort and improves operator intensity of labour's purpose.
In order to achieve the above object, the utility model provides a following technical scheme:
a digital control hydraulic working system of a loader comprises an oil tank, an oil suction filter, a lifting oil cylinder, a rotary bucket oil cylinder and an oil return filter, and further comprises a variable pump, a valve block, a first servo valve, a second servo valve and a programmable controller, wherein an oil inlet of the variable pump is in fluid connection with an oil suction port of the oil tank, the valve block is provided with P, P1, P2, A, B, T, T1, T2, LS1 and LS2 oil ports, a P port of the valve block is in fluid connection with an oil outlet of the variable pump, a P1 port of the valve block is in fluid connection with an oil inlet (5P) of the first servo valve, a T1 port of the valve block is in fluid connection with an oil outlet (5T) of the first servo valve, a first oil port (5A) of the first servo valve is in fluid connection with a rodless cavity of the lifting oil cylinder, a second oil port (5B) of the first servo valve is in fluid connection with an oil inlet of the lifting oil cylinder, and a P2 port of the valve block is in fluid connection with an oil inlet (6P) of the second servo valve, the T2 port of the valve block is in fluid connection with an oil outlet (6T) of a second servo valve, a first oil port (6A) of the second servo valve is in fluid connection with a rodless cavity of a rotating bucket oil cylinder, a second oil port (6B) of the second servo valve is in fluid connection with a rod cavity of the rotating bucket oil cylinder, the T port, the T1 port and the T2 port of the valve block are communicated with each other inside the valve block, the T port is in fluid connection with an oil return port of an oil tank through an oil return oil filter, the output end of the programmable controller is respectively connected with control end circuits of the first servo valve and the second servo valve, the input end of the programmable controller is connected with an operating handle through a circuit, and the operating handle is arranged beside a driver seat in a cab.
Further, the variable displacement pump is a load-sensitive variable displacement pump.
Furthermore, a floating valve, an overflow valve, a main check valve, a first check valve and a second check valve are arranged inside the valve block, a first oil port (7A) of the floating valve is communicated with a port A of the valve block and is in fluid connection with a rodless cavity of the lifting oil cylinder, a second oil port (7B) of the floating valve is communicated with a port B of the valve block and is in fluid connection with a rod cavity of the lifting oil cylinder, an oil outlet (7T) of the floating valve is communicated with a port T of the valve block, the overflow valve is arranged between the port P and the port T of the valve block, an inlet and an outlet of the overflow valve are respectively connected with the port P and the port T of the valve block, and the main check valve, the first check valve and the second check valve are respectively arranged in the port P, the port P1 and the port P2 of the valve block.
Further, the floating valve is a two-position four-way electromagnetic directional valve.
Furthermore, the first servo valve and the second servo valve are three-position four-way electro-hydraulic digital angle feedback servo valves.
Furthermore, an LS1 port of the valve block is connected with a first load sensing oil path, and the other end of the first load sensing oil path is connected with a feedback end of the first servo valve.
Furthermore, an LS2 port of the valve block is connected with a second load sensing oil path, and the other end of the second load sensing oil path is connected with a feedback end of a second servo valve.
Furthermore, the operating handle is an electronic operating handle, and is provided with a movable arm lifting button, a movable arm descending button, a bucket upturning button and a bucket downturning button, and the operating handle is used for operating personnel to manually control the operation action of the loader.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the load sensing technology is adopted to dynamically track the flow and pressure changes in the hydraulic system, so that the flow and the pressure of the hydraulic pump are output according to actual needs, and energy is saved.
2. The digital feedback servo valve and a PLC (programmable logic controller) are adopted for computer control, so that the action sensitivity of the hydraulic valve is ensured, and the action of the oil cylinder is accurately controlled.
3. The electronic handle is adopted for operation, so that the labor intensity of an operator is greatly reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-an oil tank, 2-an oil suction filter, 3-a variable pump, 4-a valve block, 5-a first servo valve, 6-a second servo valve, 7-a floating valve, 8-an overflow valve, 9-a main check valve, 10-a first check valve, 11-a second check valve, 12-a lifting oil cylinder, 13-a rotating bucket oil cylinder, 14-an oil return filter, 15-a first load sensing oil circuit, 16-a second load sensing oil circuit, 17-a programmable controller and 18-an operating handle.
The hydraulic control system comprises a first servo valve, a first oil inlet, a first servo valve, a first oil outlet, a first oil port and a second oil port, wherein the first oil port is 5P, the first oil port is 5T, the first oil port is 5A, and the second oil port is 5B.
6P-a second servo valve oil inlet, 6T-a second servo valve oil outlet, 6A-a second servo valve first oil port, and 6B-a second servo valve second oil port.
7T-floating valve oil outlet, 7A-floating valve first oil port, and 7B-floating valve second oil port.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the present invention provides an embodiment: a digital control hydraulic working system of a loader comprises an oil tank 1, an oil suction oil filter 2, a variable pump 3, a valve block 4, a first servo valve 5, a second servo valve 6, a floating valve 7, an overflow valve 8, a main check valve 9, a first check valve 10, a second check valve 11, a lifting oil cylinder 12, a rotary bucket oil cylinder 13, an oil return filter 14, a first load sensing oil path 15, a second load sensing oil path 16, a programmable controller 17 and an operating handle 18, wherein the variable pump 3 is a load sensitive variable pump and can automatically adjust flow output according to feedback flow and pressure changes, an oil inlet of the variable pump 3 is in fluid connection with an oil suction port of the oil tank 1, the valve block 4 is provided with P, P1, P2, A, B, T, T1, T2, LS1 and LS2, a P port of the valve block 4 is in fluid connection with an oil outlet of the variable pump 3, a P1 port of the valve block 4 is in fluid connection with an oil inlet of the first servo valve 5P, the port T1 of the valve block 4 is in fluid connection with the oil outlet 5T of the first servo valve 5, the first port 5A of the first servo valve 5 is in fluid connection with the rodless cavity of the lift cylinder 12, the second port 5B of the first servo valve 5 is in fluid connection with the rod cavity of the lift cylinder 12, the port P2 of the valve block 4 is in fluid connection with the oil inlet 6P of the second servo valve 6, the port T2 of the valve block 4 is in fluid connection with the oil outlet 6T of the second servo valve 6, the first port 6A of the second servo valve 6 is in fluid connection with the rodless cavity of the rotating bucket cylinder 13, the second port 6B of the second servo valve 6 is in fluid connection with the rod cavity of the rotating bucket cylinder 13, the port T1 and the port T2 of the valve block 4 are in mutual communication inside the valve block 4, the port T is in fluid connection with the oil return port of the oil tank 1 through the oil return 14, the output end of the programmable controller 17 is respectively connected with the control end circuits of the first servo valve 5 and the second servo valve 6, the input end of the programmable controller 17 is connected with an operating handle 18 through a circuit, the operating handle is arranged beside a driver seat in a cab, the operating handle is an electronic operating handle, and is provided with movable arm lifting, movable arm descending, bucket upturning and bucket downturning buttons for an operator to manually control the operation action of the loader.
The internal of the valve block 4 is provided with a floating valve 7, an overflow valve 8, a main check valve 9, a first check valve 10 and a second check valve 11, the floating valve 7 is a two-position four-way electromagnetic directional valve and is used for controlling the floating action of the loader, a first oil port 7A of the floating valve 7 is communicated with an A port of the valve block 4 and is in fluid connection with a rodless cavity of the lifting oil cylinder 12, a second oil port 7B of the floating valve 7 is communicated with a B port of the valve block 4 and is in fluid connection with a rod cavity of the lifting oil cylinder 12, an oil outlet 7T of the floating valve 7 is communicated with a T port of the valve block 4, the overflow valve 8 is arranged between the P port and the T port of the valve block 4 and is used for preventing the hydraulic system from being overloaded, an inlet and an outlet of the overflow valve 8 are respectively connected with the P port and the T port of the valve block 4, and the main check valve 9, the first check valve 10 and the second check valve 11 are respectively arranged in the P port, the.
The first servo valve 5 and the second servo valve 6 are three-position four-way electro-hydraulic digital angle feedback servo valves.
A first load sensing oil passage 15 is connected to an LS1 port of the valve block 4, and the other end thereof is connected to a feedback end of the first servo valve 5.
A second load sensing oil passage 16 is connected to an LS2 port of the valve block 4, and the other end thereof is connected to a feedback end of the second servo valve 6.
The working principle of the embodiment is as follows: when the loader needs to lift the movable arm, a movable arm lifting button on the operating handle 18 is pressed, a signal is transmitted to the programmable controller 17, the programmable controller 17 sends an instruction to a control end of the first servo valve 5, the first servo valve 5 is powered, the valve core moves downwards and works in an upper position, an oil inlet 5P is communicated with the first oil port 5A, an oil outlet 5T is communicated with the second oil port 5B, the variable pump 3 outputs hydraulic oil from the oil tank 1 through the oil suction filter 2, the output pressure oil enters a P port of the valve block 4, the output pressure oil enters a P1 port of the valve block 4 through the main check valve 9 and the first check valve 10, then enters a rodless cavity of the lifting oil cylinder 12 through the oil inlet 5P and the first oil port 5A of the first servo valve 5, a piston rod is pushed to extend outwards, and meanwhile, hydraulic oil in a rod cavity of the lifting oil cylinder 12 enters a T1 port of the valve block 4 through the second oil port 5B and the oil outlet 5T of the first servo valve 5, and flows back to the oil tank 1 from a T port of the valve block 4 through the return oil filter 14, and the piston rod of the lifting oil cylinder 12 extends outwards to drive the movable arm to lift, so that the lifting action of the movable arm is completed.
When the loader needs to perform a boom descending action, a boom descending button on the operating handle 18 is pressed, a signal is transmitted to the programmable controller 17, the programmable controller 17 sends an instruction to a control end of the first servo valve 5, the first servo valve 5 is powered, the valve core moves upwards and works in a lower position, the oil inlet 5P is communicated with the second oil port 5B, the oil outlet 5T is communicated with the first oil port 5A, the variable displacement pump 3 outputs hydraulic oil from the oil tank 1 through the oil suction filter 2, the output pressure oil enters the P port of the valve block 4, the output pressure oil enters the P1 port of the valve block 4 through the main check valve 9 and the first check valve 10, then enters the rod cavity of the lifting oil cylinder 12 through the oil inlet 5P and the second oil port 5B of the first servo valve 5, the piston rod is pushed to retract inwards, and meanwhile, hydraulic oil in the rodless cavity of the lifting oil cylinder 12 enters the T1 port of the valve block 4 through the first oil port 5A and the oil outlet 5T of the first servo valve 5, and flows back to the oil tank 1 from a T port of the valve block 4 through the return oil filter 14, and the inward retraction of a piston rod of the lifting oil cylinder 12 drives the movable arm to descend, so that the descending action of the movable arm is completed.
In the process of lifting or descending the movable arm, the first load sensing oil circuit 15 transmits the pressure and flow change conditions in the rodless cavity or the rod cavity of the lifting oil cylinder 12 to the variable pump 3 from the feedback end of the first servo valve 5 through the LS1 port and the LS port of the valve block 4 in real time, and the variable pump 3 automatically changes the oil output, so that the coordination control function is realized, and the energy consumption is reduced.
When the loader needs to perform the bucket upturning action, a bucket upturning button on the control handle 18 is pressed, a signal is transmitted to the programmable controller 17, the programmable controller 17 sends an instruction to a control end of the second servo valve 6, the second servo valve 6 is electrified, the valve core moves upwards and works at the lower position, the oil inlet 6P is communicated with the second oil port 6B, the oil outlet 6T is communicated with the first oil port 6A, the variable displacement pump 3 outputs hydraulic oil from the oil tank 1 through the oil suction filter 2, the output pressure oil enters the P port of the valve block 4, the output pressure oil is output from the P2 port of the valve block 4 through the main check valve 9 and the second check valve 11 and then enters the rod cavity of the rotary bucket oil cylinder 13 through the oil inlet 6P and the second oil port 6B of the second servo valve 6 to push the piston rod to retract inwards, and simultaneously, the hydraulic oil in the rodless cavity of the rotary bucket oil cylinder 13 enters the T2 port of the valve block 4 through the oil outlets 6A and 6T of the second servo valve 6, and flows back to the oil tank 1 from a T port of the valve block 4 through the return oil filter 14, and the bucket is driven to turn up by the inward retraction of a piston rod of the rotating bucket oil cylinder 13, so that the bucket turning up action is completed.
When the loader needs to perform a bucket downward-turning action, a bucket downward-turning button on the operating handle 18 is pressed, a signal is transmitted to the programmable controller 17, the programmable controller 17 sends an instruction to a control end of the second servo valve 6, the second servo valve 6 is electrified, the valve core moves downward and works in an upper position, an oil inlet 6P is communicated with the first oil port 6A, an oil outlet 6T is communicated with the second oil port 6B, the variable pump 3 outputs hydraulic oil from the oil tank 1 through the oil filter 2, the output pressure oil enters a P port of the valve block 4, the output pressure oil is output from a P2 port of the valve block 4 through the main check valve 9 and the second check valve 11, then enters a rodless cavity of the rotary bucket oil cylinder 13 through the oil inlet 6P of the second servo valve 6 and the first oil port 6A, a piston rod is pushed to extend outwards, and meanwhile, hydraulic oil in a rod cavity of the rotary bucket oil cylinder 13 enters a T2 port of the valve block 4 through the second oil port 6B and the 6T of the second servo valve 6T, and flows back to the oil tank 1 from a T port of the valve block 4 through the return oil filter 14, and the piston rod of the rotating bucket oil cylinder 13 extends outwards to drive the bucket to turn downwards, so that the bucket turning downwards is completed.
In the process of turning up or turning down the bucket, the second load sensing oil path 16 transmits the pressure and flow change conditions in the rod cavity or the rodless cavity of the rotating bucket oil cylinder 13 from the feedback end of the second servo valve 6 to the variable pump 3 through the LS2 port and the LS port of the valve block 4 in real time, and the variable pump 3 automatically changes the oil output, so that the coordination control function is realized, and the energy consumption is reduced.
When the loader needs to level the ground, a floating button (not shown in the figure) is pressed, the floating button is arranged on the control panel and is electrically connected with the control end of the floating valve 7, the floating valve 7 is electrified, the valve core moves leftwards and works in the right position, the first oil port 7A, the second oil port 7B and the oil outlet 7T are mutually communicated, the pressure in the rodless cavity and the rod cavity of the lifting oil cylinder 12 is the same as the external atmospheric pressure, so that the bucket is in a floating state and can follow the height fluctuation of the ground, and the purpose of leveling the ground is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a loader numerical control hydraulic pressure work system, includes oil tank (1), oil absorption oil filter (2), lift cylinder (12), rotary bucket hydro-cylinder (13) and return oil filter (14), its characterized in that: the hydraulic control system is characterized by further comprising a variable pump (3), a valve block (4), a first servo valve (5), a second servo valve (6) and a programmable controller (17), wherein an oil inlet of the variable pump (3) is in fluid connection with an oil suction port of the oil tank (1), the valve block (4) is provided with P, P1 oil ports, P2 oil ports, A, B, T, T1 oil ports, T2 oil ports, LS1 oil ports and LS2 oil ports, the P port of the valve block (4) is in fluid connection with an oil outlet of the variable pump (3), a P1 port of the valve block (4) is in fluid connection with an oil inlet (5P) of the first servo valve (5), a T1 port of the valve block (4) is in fluid connection with an oil outlet (5T) of the first servo valve (5), a first oil port (5A) of the first servo valve (5) is in fluid connection with a rodless cavity of the lifting oil cylinder (12), and a rod cavity of the second oil port (5B) of the first servo valve (5) is in fluid connection with a rod cavity of the lifting oil cylinder, the port P2 of the valve block (4) is in fluid connection with the oil inlet (6P) of the second servo valve (6), the port T2 of the valve block (4) is in fluid connection with the oil outlet (6T) of the second servo valve (6), the first oil port (6A) of the second servo valve (6) is in fluid connection with a rodless cavity of the rotating bucket oil cylinder (13), the second oil port (6B) of the second servo valve (6) is in fluid connection with a rod cavity of the rotating bucket oil cylinder (13), the port T1 and the port T2 of the valve block (4) are communicated with each other inside the valve block (4), the port T is in fluid connection with an oil return port of the oil tank (1) through an oil filter (14), the output end of the programmable controller (17) is respectively connected with control end circuits of the first servo valve (5) and the second servo valve (6), and the input end of the programmable controller (17) is connected with a control handle (18) through a circuit, the operating handle (18) is arranged beside a driver seat in a cab.
2. A loader digital controlled hydraulic work system according to claim 1 wherein: the variable pump (3) is a load-sensitive variable pump.
3. A loader digital controlled hydraulic work system according to claim 1 wherein: a floating valve (7), an overflow valve (8), a main check valve (9), a first check valve (10) and a second check valve (11) are arranged inside the valve block (4), a first oil port (7A) of the floating valve (7) is communicated with a port A of the valve block (4) and is in fluid connection with a rodless cavity of the lifting oil cylinder (12), a second oil port (7B) of the floating valve (7) is communicated with a port B of the valve block (4) and is in fluid connection with a rod cavity of the lifting oil cylinder (12), an oil outlet (7T) of the floating valve (7) is communicated with a port T of the valve block (4), the overflow valve (8) is arranged between the port P and the port T of the valve block (4), an inlet and an outlet of the overflow valve (8) are respectively connected with the port P and the port T of the valve block (4), and the main check valve (9), the first check valve (10) and the second check valve (11) are respectively arranged at the port P of the valve block (4), P1 port and P2 port.
4. A loader digital controlled hydraulic work system according to claim 3 wherein: the floating valve (7) is a two-position four-way electromagnetic directional valve.
5. A loader digital controlled hydraulic work system according to claim 1 wherein: the first servo valve (5) and the second servo valve (6) are three-position four-way electro-hydraulic digital angle feedback servo valves.
6. A loader digital controlled hydraulic work system according to claim 1 wherein: and an LS1 port of the valve block (4) is connected with a first load sensing oil path (15), and the other end of the first load sensing oil path is connected with a feedback end of the first servo valve (5).
7. A loader digital controlled hydraulic work system according to claim 1 wherein: and an LS2 port of the valve block (4) is connected with a second load sensing oil path (16), and the other end of the second load sensing oil path is connected with a feedback end of a second servo valve (6).
8. A loader digital controlled hydraulic work system according to claim 1 wherein: the operating handle (18) is an electronic operating handle and is provided with movable arm lifting, movable arm descending, bucket upturning and bucket downturning buttons, and is used for an operator to manually control the operation action of the loader.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921716373.3U CN210599687U (en) | 2019-10-14 | 2019-10-14 | Digital control hydraulic working system of loader |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921716373.3U CN210599687U (en) | 2019-10-14 | 2019-10-14 | Digital control hydraulic working system of loader |
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| CN210599687U true CN210599687U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321045A (en) * | 2022-01-11 | 2022-04-12 | 徐州徐工道金特种机器人技术有限公司 | A weight reduction control valve, a hydraulic control system using the same, and a mine-sweeping vehicle |
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2019
- 2019-10-14 CN CN201921716373.3U patent/CN210599687U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321045A (en) * | 2022-01-11 | 2022-04-12 | 徐州徐工道金特种机器人技术有限公司 | A weight reduction control valve, a hydraulic control system using the same, and a mine-sweeping vehicle |
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Effective date of registration: 20201218 Address after: 337000 Luxi County Industrial Park, Pingxiang City, Jiangxi Province Patentee after: PINGXIANG FANGYUAN INDUSTRY Co.,Ltd. Address before: 337000 Luxi County Industrial Park, Pingxiang City, Jiangxi Province Patentee before: Jiangxi Boyuan Digital Hydraulic Technology Co.,Ltd. |