CN104390788A - Oil supply oil way used for engine test bed and method for controlling oil supply oil way - Google Patents
Oil supply oil way used for engine test bed and method for controlling oil supply oil way Download PDFInfo
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- CN104390788A CN104390788A CN201410662311.4A CN201410662311A CN104390788A CN 104390788 A CN104390788 A CN 104390788A CN 201410662311 A CN201410662311 A CN 201410662311A CN 104390788 A CN104390788 A CN 104390788A
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Abstract
The invention discloses an oil supply oil way used for an engine test bed and a method for controlling the oil supply oil way. The oil supply oil way comprises a main fuel oil pipeline and an auxiliary oil way, wherein the main fuel oil pipeline is connected into an engine through a working spray nozzle, the input end of the auxiliary oil way is communicated with the output end of an oil pump, the oil pump is connected with an oil injection motor, the output end of the auxiliary oil way is communicated with the main fuel oil pipeline through an auxiliary oil way valve. The pipeline portion, between the oil pump and the auxiliary oil way valve, of the auxiliary oil way is communicated with a proportional reversing oil way which is communicated with the main fuel oil pipeline and used for regulating the oil pressure of internal combustion oil of the main fuel oil pipeline. The proportional reversing oil way is communicated with the main fuel oil pipeline through a proportional reversing valve. The oil supply oil way further comprises a PLC and a data collection system. The data collection system is connected with the PLC and feeds collection information back to the PLC. The fuel oil pressure regulation function of the auxiliary oil way is achieved.
Description
Technical field
The present invention relates to aeromotor ground experiment field, especially, relate to a kind of oil feeding line for engine testsand.In addition, the invention still further relates to a kind of method that engine testsand controls oil feeding line.
Background technology
Aeromotor kinematic train is used for providing power for aircraft, and the certification test in various model engine production, use procedure is the important means ensureing aircraft utilization safety.Because aircraft is difficult to carry out these certification tests in flight course, therefore these certification tests all need to complete on ground, and this just needs by arriving engine testsand.
And complicated plane hydraulic system cannot be installed due to Test-bed, the aeromotor kinematic train of ground or state of flight is generally reproduced in the mode of simulation.And aero engine technology specifies in requiring that the oil pressure that will carry out auxiliary oil way is measured, but aircraft engine test stand there is no this cover system at present, and without can refer to example, independently need carry out the design of engine testsand auxiliary oil way, realize engine fuel regulator, the range of adjustment of speed regulator and regulated value and measure and adjustment.
Summary of the invention
The object of the invention is a kind of method providing oil feeding line for engine testsand and control oil feeding line, to solve the technical matters that existing aircraft engine test stand lacks the system that auxiliary oil way oil pressure is measured and adjusted.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of oil feeding line for engine testsand, comprise for providing the main fuel pipeline of fuel oil needed for engine running and for regulating the auxiliary oil way of oil pressure in main fuel pipeline, main fuel pipeline accesses engine by main jet, the input end of auxiliary oil way is communicated with oily delivery side of pump, oil pump is connected to oiling motor, the output terminal of auxiliary oil way is communicated with main fuel pipeline by auxiliary oil way valve; The pipeline position of auxiliary oil way between oil pump and auxiliary oil way valve is connected with main fuel pipeline connection and for regulating the ratio reversing oil circuit of fuel oil oil pressure in main fuel pipeline, ratio reversing oil circuit passing ratio reversal valve is communicated with main fuel pipeline; Oil feeding line also comprise for control ratio reversal valve aperture and control oiling motor speed PLC and for collecting work nozzle oil pressure information, gather auxiliary oil way oiling oil pressure information, gather oiling motor speed information and gather the data actuation of proportional reversing valve opening information, data actuation connects PLC and to PLC feedback collection information.
Further, PLC is by the rotating speed of frequency-variable controller regulable control oiling motor, and frequency-variable controller is connected with power supply; Data actuation gathers oiling motor speed information by frequency-variable controller; Frequency-variable controller is provided with the filling pump rotational speed regulation potentiometer for regulating oiling motor speed.
Further, PLC is provided with the proportional servo valve regulator potentiometer for control ratio reversal valve aperture.
Further, main fuel pipeline is provided with working connection pressure unit in the pipeline position being communicated with main jet; Auxiliary oil way pressure unit is provided with in the pipeline of auxiliary oil way between ratio reversing oil circuit and auxiliary oil way valve; Data actuation gathers the fuel oil oil pressure in main fuel pipeline by working connection pressure unit and gathers the fuel oil oil pressure in auxiliary oil way by auxiliary oil way pressure unit.
According to a further aspect in the invention, additionally provide a kind of method that engine testsand controls oil feeding line, open frequency-variable controller and auxiliary oil way valve, then regulate the filling pump rotational speed regulation potentiometer on frequency-variable controller and regulate the proportional servo valve regulator potentiometer in PLC to form on-off model, on-off model is transferred to PLC, PLC judges to export and controls oiling machine operation, control auxiliary oil way valve work and the action of control ratio reversal valve, thus realizes the pressure adjusting function of auxiliary oil way to main fuel pipeline.
Further, gathered and record the frequency ratio information of the output oil pressure information of main fuel pipeline, the output oil pressure information of auxiliary oil way, the opening information of proportional reversing valve and frequency-variable controller by data actuation; Data actuation by gather and record information feed back to PLC, PLC is controlled oiling machine operation by the feedback information of data actuation, is controlled auxiliary oil way valve work and the action of control ratio reversal valve, thus realizes the pressure adjusting function of auxiliary oil way to main fuel pipeline.
Further, power supply connects frequency-variable controller and PLC respectively by relay, and power switch closes, and relay obtains electric adhesive, and frequency-variable controller and PLC obtain electric; The output terminal of PLC obtains electric and controls frequency-variable controller startup and the unlatching of control ratio reversal valve respectively, and oiling motor and the ratio reversing oil circuit of auxiliary oil way obtain electric work.
Further, be that the oil pressure leading to main jet with main fuel pipeline is consistent by the fuel oil adjustment of oil pressure in auxiliary oil way, rotary proportional servo-valve regulator potentiometer correspondingly changes the aperture of proportional reversing valve, rotate the rotating speed that filling pump rotational speed regulation potentiometer correspondingly changes oiling motor, the pressure in auxiliary oil way is corresponding change also.
Further, rotate resize ratio servo-valve regulator potentiometer gradually and rotate adjustment filling pump rotational speed regulation potentiometer gradually, the fuel oil oil pressure in auxiliary oil way is increased, and auxiliary oil way is gradually to the oiling of main fuel pipeline; Along with the increase of the fuel oil oil pressure in auxiliary oil way, auxiliary oil way is to the corresponding increase of injection flow of main fuel pipeline, until the high pressure rotor rotating speed of engine is raised to than idling rating regulation rotating speed height 3%-10%, the fuel flow now recorded is minimum fuel flow; Or rotate resize ratio servo-valve regulator potentiometer gradually and rotate adjustment filling pump rotational speed regulation potentiometer gradually, fuel oil oil pressure in auxiliary oil way is reduced, fuel oil in main fuel pipeline flow to auxiliary oil way through auxiliary oil way valve and proportional reversing valve, the amount of draining the oil corresponding increase when the fuel oil oil pressure in main fuel pipeline reduces.
Further, progressively adjust the fuel oil oil pressure of auxiliary oil way, until after engine slow train rotating speed returns to the main jet pressure state before connecting main fuel pipeline, close auxiliary oil way after closing proportional reversing valve and auxiliary oil way valve.
The present invention has following beneficial effect:
The real-time control of comparative example reversal valve aperture and oiling motor speed is realized by PLC; By data actuation, the oiling oil pressure information of the oil pressure information of main jet, auxiliary oil way, the rotary speed information of oiling motor and the opening information of proportional reversing valve are gathered timely; Carry out information feed back timely by acquisition system to PLC, make PLC make corresponding control action, thus realize the regulatory function of the fuel oil oil pressure of auxiliary oil way.Also can check simultaneously, adjust engine fuel regulator 0.6 maximum continuous, maximum continuously, the range of adjustment of speed regulator and flow regulator and regulated value under maximum thrust state, ensure that engine performance parameter is in specialized range.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the oil feeding line for engine testsand of the preferred embodiment of the present invention;
Fig. 2 is that the pressure of the oil feeding line for engine testsand of the preferred embodiment of the present invention regulates electrical schematic diagram.
Marginal data:
1, main fuel pipeline; 2, auxiliary oil way; 3, main jet; 4, oil pump; 5, oiling motor; 6, auxiliary oil way valve; 7, ratio reversing oil circuit; 8, proportional reversing valve; 9, PLC; 10, data actuation; 11, frequency-variable controller; 12, filling pump rotational speed regulation potentiometer; 13, proportional servo valve regulator potentiometer; 14, working connection pressure unit; 15, auxiliary oil way pressure unit.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the present invention can by the multitude of different ways that limits and cover implement.
Fig. 1 is the structural representation of the oil feeding line for engine testsand of the preferred embodiment of the present invention; Fig. 2 is that the pressure of the oil feeding line for engine testsand of the preferred embodiment of the present invention regulates electrical schematic diagram.As depicted in figs. 1 and 2, the oil feeding line for engine testsand of the present embodiment, comprise for providing the main fuel pipeline 1 of fuel oil needed for engine running and for regulating the auxiliary oil way 2 of oil pressure in main fuel pipeline 1, main fuel pipeline 1 accesses engine by main jet 3, the input end of auxiliary oil way 2 is communicated with the output terminal of oil pump 4, oil pump 4 is connected to oiling motor 5, the output terminal of auxiliary oil way 2 is communicated with main fuel pipeline 1 by auxiliary oil way valve 6; The pipeline position of auxiliary oil way 2 between oil pump 4 with auxiliary oil way valve 6 is connected with and is communicated with main fuel pipeline 1 and for regulating the ratio reversing oil circuit 7 of fuel oil oil pressure in main fuel pipeline 1, ratio reversing oil circuit 7 passing ratio reversal valve 8 is communicated with main fuel pipeline 1; Oil feeding line also comprise for control ratio reversal valve 8 aperture and control oiling motor 5 rotating speed PLC 9 and for collecting work nozzle 3 oil pressure information, gather auxiliary oil way 2 oiling oil pressure information, gather oiling motor 5 rotary speed information and gather the data actuation 10 of proportional reversing valve 8 opening information, data actuation 10 connects PLC 9 and to PLC 9 feedback collection information.The real-time control of comparative example reversal valve aperture and oiling motor speed is realized by PLC; By data actuation, the oiling oil pressure information of the oil pressure information of main jet, auxiliary oil way, the rotary speed information of oiling motor and the opening information of proportional reversing valve are gathered timely; Carry out information feed back timely by acquisition system to PLC, make PLC make corresponding control action, thus realize the regulatory function of the fuel oil oil pressure of auxiliary oil way.Also can check simultaneously, adjust engine fuel regulator 0.6 maximum continuous, maximum continuously, the range of adjustment of speed regulator and flow regulator and regulated value under maximum thrust state, ensure that engine performance parameter is in specialized range.
As depicted in figs. 1 and 2, in the present embodiment, PLC 9 is by the rotating speed of frequency-variable controller 11 regulable control oiling motor 5, and frequency-variable controller 11 is connected with power supply; Data actuation 10 gathers oiling motor 5 rotary speed information by frequency-variable controller 11; Frequency-variable controller 11 is provided with the filling pump rotational speed regulation potentiometer 12 for regulating oiling motor 5 rotating speed.
As depicted in figs. 1 and 2, in the present embodiment, PLC 9 is provided with the proportional servo valve regulator potentiometer 13 for control ratio reversal valve 8 aperture.
As depicted in figs. 1 and 2, in the present embodiment, main fuel pipeline 1 is provided with working connection pressure unit 14 in the pipeline position being communicated with main jet 3; Auxiliary oil way pressure unit 15 is provided with in the pipeline of auxiliary oil way 2 between ratio reversing oil circuit 7 and auxiliary oil way valve 6; The fuel oil oil pressure that data actuation 10 is gathered the fuel oil oil pressure in main fuel pipeline 1 by working connection pressure unit 14 and gathered by auxiliary oil way pressure unit 15 in auxiliary oil way 2.
As depicted in figs. 1 and 2, the engine testsand of the present embodiment controls the method for oil feeding line, open frequency-variable controller 11 and auxiliary oil way valve 6, then regulate the filling pump rotational speed regulation potentiometer 12 on frequency-variable controller 11 and regulate the proportional servo valve regulator potentiometer 13 in PLC 9 to form on-off model, on-off model is transferred to PLC 9, PLC 9 judges to export and control oiling motor 5 to work, control auxiliary oil way valve 6 to work and control ratio reversal valve 8 action, thus realize the pressure adjusting function of auxiliary oil way 2 pairs of main fuel pipelines 1.
As shown in Figure 2, in the present embodiment, gather and record the frequency ratio information of the output oil pressure information of main fuel pipeline 1, the output oil pressure information of auxiliary oil way 2, the opening information of proportional reversing valve 8 and frequency-variable controller 11 by data actuation 10; Data actuation 10 by gather and record information feed back to PLC 9, PLC 9 is worked by the feedback information control oiling motor 5 of data actuation 10, control auxiliary oil way valve 6 works and control ratio reversal valve 8 action, thus realizes the pressure adjusting function of auxiliary oil way 2 pairs of main fuel pipelines 1.
As shown in Figure 2, in the present embodiment, power supply connects frequency-variable controller 11 and PLC 9 respectively by relay, and power switch closes, and relay obtains electric adhesive, and frequency-variable controller 11 and PLC 9 obtain electric; The output terminal of PLC 9 obtains electric and controls frequency-variable controller 11 respectively and to start and control ratio reversal valve 8 is opened, and oiling motor 5 and the ratio reversing oil circuit 7 of auxiliary oil way 2 must electric work.
As shown in Figure 2, in the present embodiment, be that the oil pressure leading to main jet 3 with main fuel pipeline 1 is consistent by the fuel oil adjustment of oil pressure in auxiliary oil way 2, rotary proportional servo-valve regulator potentiometer 13 correspondingly changes the aperture of proportional reversing valve 8, rotate the rotating speed that filling pump rotational speed regulation potentiometer 12 correspondingly changes oiling motor 5, the pressure in auxiliary oil way 2 is corresponding change also.
As shown in Figure 2, in the present embodiment, rotate resize ratio servo-valve regulator potentiometer 13 gradually and rotate adjustment filling pump rotational speed regulation potentiometer 12 gradually, the fuel oil oil pressure in auxiliary oil way 2 is increased, and auxiliary oil way 2 is gradually to main fuel pipeline 1 oiling; Along with the increase of the fuel oil oil pressure in auxiliary oil way 2, auxiliary oil way 2 is to the corresponding increase of injection flow of main fuel pipeline 1, until the high pressure rotor rotating speed of engine is raised to than idling rating regulation rotating speed height 3%-10%, the fuel flow now recorded is minimum fuel flow; Or rotate resize ratio servo-valve regulator potentiometer 13 gradually and rotate adjustment filling pump rotational speed regulation potentiometer 12 gradually, fuel oil oil pressure in auxiliary oil way 2 is reduced, fuel oil in main fuel pipeline 1 flow to auxiliary oil way 2 through auxiliary oil way valve 6 and proportional reversing valve 8, the amount of draining the oil corresponding increase when the fuel oil oil pressure in main fuel pipeline 1 reduces.Be used for checking, the idle turning regulator of adjustment engine fuel regulator and the range of adjustment of slow train flow regulator and regulated value, provide foundation to engine performance adjustment.
As shown in Figure 2, in the present embodiment, progressively adjust the fuel oil oil pressure of auxiliary oil way 2, until after engine slow train rotating speed returns to main jet 3 pressure state before connecting main fuel pipeline 1, close auxiliary oil way 2 after closing proportional reversing valve 8 and auxiliary oil way valve 6.Be used for checking, the idle turning regulator of adjustment engine fuel regulator and the range of adjustment of slow train flow regulator and regulated value, provide foundation to engine performance adjustment.
Time real-time, oil feeding line for engine testsand: realize auxiliary oil way 2 pressure adjusting function by potentiometer, frequency-variable controller 11 and proportional reversing valve 8, be used for checking, the idle turning regulator of adjustment engine fuel regulator and the range of adjustment of slow train flow regulator and regulated value, provide foundation to engine performance adjustment.Also can check simultaneously, adjust engine fuel regulator 0.6 maximum continuous, maximum continuously, the range of adjustment of speed regulator and flow regulator and regulated value under maximum thrust state, ensure that engine performance parameter is in specialized range.
The present invention is cured to test bay, and this cover pressure regulating system good stability, reliability is high, can be good at meeting engine run requirement.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1., for an oil feeding line for engine testsand, it is characterized in that,
Comprise for providing the main fuel pipeline (1) of fuel oil needed for engine running and for regulating the auxiliary oil way (2) of the interior oil pressure of described main fuel pipeline (1),
Described main fuel pipeline (1) is by main jet (3) access engine, the input end of described auxiliary oil way (2) is communicated with the output terminal of oil pump (4), described oil pump (4) is connected to oiling motor (5), the output terminal of described auxiliary oil way (2) is communicated with described main fuel pipeline (1) by auxiliary oil way valve (6);
The pipeline position of described auxiliary oil way (2) between described oil pump (4) with described auxiliary oil way valve (6) is connected with and is communicated with described main fuel pipeline (1) and for regulating the ratio reversing oil circuit (7) of fuel oil oil pressure in described main fuel pipeline (1), described ratio reversing oil circuit (7) passing ratio reversal valve (8) is communicated with described main fuel pipeline (1);
Described oil feeding line also comprise for control described proportional reversing valve (8) aperture and control described oiling motor (5) rotating speed PLC (9) and for gathering described main jet (3) oil pressure information, gather described auxiliary oil way (2) oiling oil pressure information, gather described oiling motor (5) rotary speed information and gather the data actuation (10) of described proportional reversing valve (8) opening information, described data actuation (10) connects described PLC (9) and to described PLC (9) feedback collection information.
2. the oil feeding line for engine testsand according to claim 1, is characterized in that,
Described PLC (9) is by the rotating speed of oiling motor (5) described in frequency-variable controller (11) regulable control, and described frequency-variable controller (11) is connected with power supply;
Described data actuation (10) gathers described oiling motor (5) rotary speed information by described frequency-variable controller (11);
Described frequency-variable controller (11) is provided with the filling pump rotational speed regulation potentiometer (12) for regulating described oiling motor (5) rotating speed.
3. the oil feeding line for engine testsand according to claim 2, it is characterized in that, described PLC (9) is provided with the proportional servo valve regulator potentiometer (13) for controlling described proportional reversing valve (8) aperture.
4. the oil feeding line for engine testsand according to claim 3, is characterized in that,
Described main fuel pipeline (1) is provided with working connection pressure unit (14) in the pipeline position being communicated with described main jet (3);
Auxiliary oil way pressure unit (15) is provided with in the pipeline of described auxiliary oil way (2) between described ratio reversing oil circuit (7) and described auxiliary oil way valve (6);
The fuel oil oil pressure that described data actuation (10) is gathered the fuel oil oil pressure in described main fuel pipeline (1) by described working connection pressure unit (14) and gathered by described auxiliary oil way pressure unit (15) in described auxiliary oil way (2).
5. engine testsand controls a method for oil feeding line, it is characterized in that,
Open frequency-variable controller (11) and auxiliary oil way valve (6), then regulate the filling pump rotational speed regulation potentiometer (12) on described frequency-variable controller (11) and regulate the proportional servo valve regulator potentiometer (13) in PLC (9) to form on-off model
Described on-off model is transferred to described PLC (9), described PLC (9) judges to export and controls oiling motor (5) work, control auxiliary oil way valve (6) work and control ratio reversal valve (8) action, thus realizes auxiliary oil way (2) to the pressure adjusting function of main fuel pipeline (1).
6. engine testsand according to claim 5 controls the method for oil feeding line, it is characterized in that,
Gather and record the output oil pressure information of described main fuel pipeline (1), the output oil pressure information of described auxiliary oil way (2), the opening information of described proportional reversing valve (8) and the frequency ratio information of described frequency-variable controller (11) by data actuation (10);
The information feed back of collection and record is given described PLC (9) by described data actuation (10),
Described PLC (9) controls described oiling motor (5) by the feedback information of described data actuation (10) and works, controls described auxiliary oil way valve (6) and work and control described proportional reversing valve (8) action, thus realizes auxiliary oil way (2) to the pressure adjusting function of main fuel pipeline (1).
7. engine testsand according to claim 6 controls the method for oil feeding line, it is characterized in that,
Power supply connects described frequency-variable controller (11) and described PLC (9) respectively by relay, power switch closes, relay obtains electric adhesive, and described frequency-variable controller (11) and described PLC (9) obtain electric;
The output terminal of described PLC (9) obtains electric and controls described frequency-variable controller (11) respectively and start and control described proportional reversing valve (8) and open,
The described oiling motor (5) of described auxiliary oil way (2) and ratio reversing oil circuit (7) obtain electric work.
8. engine testsand according to claim 7 controls the method for oil feeding line, it is characterized in that,
Be that the oil pressure leading to main jet (3) with described main fuel pipeline (1) is consistent by the fuel oil adjustment of oil pressure in described auxiliary oil way (2),
Rotate the aperture that described proportional servo valve regulator potentiometer (13) correspondingly changes described proportional reversing valve (8), rotate the rotating speed that described filling pump rotational speed regulation potentiometer (12) correspondingly changes described oiling motor (5), the also corresponding change of the pressure in described auxiliary oil way (2).
9. engine testsand according to claim 7 controls the method for oil feeding line, it is characterized in that,
Rotate the described proportional servo valve regulator potentiometer (13) of adjustment gradually and rotate the described filling pump rotational speed regulation potentiometer (12) of adjustment gradually, fuel oil oil pressure in described auxiliary oil way (2) is increased, and described auxiliary oil way (2) is gradually to the oiling of described main fuel pipeline (1); Along with the increase of the fuel oil oil pressure in described auxiliary oil way (2), described auxiliary oil way (2) is to the corresponding increase of injection flow of described main fuel pipeline (1), until the high pressure rotor rotating speed of engine is raised to higher by 3%.10% than idling rating regulation rotating speed, the fuel flow now recorded is minimum fuel flow; Or
Rotate the described proportional servo valve regulator potentiometer (13) of adjustment gradually and rotate the described filling pump rotational speed regulation potentiometer (12) of adjustment gradually, fuel oil oil pressure in described auxiliary oil way (2) is reduced, fuel oil in described main fuel pipeline (1) flow to described auxiliary oil way (2) through described auxiliary oil way valve (6) and described proportional reversing valve (8), the amount of draining the oil corresponding increase when the fuel oil oil pressure in described main fuel pipeline (1) reduces.
10. engine testsand according to claim 9 controls the method for oil feeding line, it is characterized in that, progressively adjust the fuel oil oil pressure of described auxiliary oil way (2), until after engine slow train rotating speed returns to and connect front main jet (3) pressure state of described main fuel pipeline (1), close described proportional reversing valve (8) and described auxiliary oil way valve (6) closes described auxiliary oil way (2) afterwards.
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| CN112945562A (en) * | 2021-01-15 | 2021-06-11 | 北京动力机械研究所 | Control system and control method for high enthalpy engine test bed facility |
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| CN108426710B (en) * | 2018-05-22 | 2024-04-30 | 广州飞机维修工程有限公司 | Testing device and method for fuel flow regulator of auxiliary power system of civil aircraft |
| CN112945562A (en) * | 2021-01-15 | 2021-06-11 | 北京动力机械研究所 | Control system and control method for high enthalpy engine test bed facility |
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| CN114278964B (en) * | 2021-12-27 | 2022-12-13 | 中国人民解放军国防科技大学 | Fuel nozzle suitable for wide-range ramjet |
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| CN104390788B (en) | 2017-06-09 |
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Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee after: China Hangfa South Industrial Co. Ltd. Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee before: China Southern Airlines Industry (Group) Co., Ltd. |
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