CN104946802A - Automatic control system of intermittent sugar boiling containers in cane sugar factories - Google Patents
Automatic control system of intermittent sugar boiling containers in cane sugar factories Download PDFInfo
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- CN104946802A CN104946802A CN201510364534.7A CN201510364534A CN104946802A CN 104946802 A CN104946802 A CN 104946802A CN 201510364534 A CN201510364534 A CN 201510364534A CN 104946802 A CN104946802 A CN 104946802A
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- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B25/00—Evaporators or boiling pans specially adapted for sugar juices; Evaporating or boiling sugar juices
- C13B25/06—Evaporators or boiling pans specially adapted for sugar juices; Evaporating or boiling sugar juices combined with measuring instruments for effecting control of the process
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Abstract
The invention discloses an automatic control system of intermittent sugar boiling containers in cane sugar factories. The automatic control system includes a PLC (programmable logic controller) system, a vacuum pressure transmitter, a vacuum regulating valve, a steam regulating valve, and the like, wherein the PLC system includes a vacuum degree control module, a steam pressure control module, an alarm control module, a liquid level control module, and the like; the steam pressure control module is used for controlling opening and closing of the steam regulating valve via a PLC according to the signal of the steam pressure value measured by a capillary pressure measuring instrument; the alarm control module is used for controlling an alarm to give an alarm via the PLC according to set parameters and recording the alarm information on line in real time; the liquid level control module and a massecuite brix control module are used for jointly controlling opening and closing of a water inlet valve and a feed valve; the massecuite brix control module is used for sending a brix signal to a stirring control module; the stirring control module is used for controlling the speed of a stirrer via a current transmitter according to the signal. The automatic control system has the advantages of high sugar boiling crystallization efficiency, high degree of automation, low accident rate and high reliability.
Description
Technical field
The present invention relates to sugar refining technology control techniques field, be specifically related to cane sugar factory interval boiling pan Controlling System.
Background technology
In sugar industry is produced, boiling sugar is last one production link, and be very crucial and important link, it utilizes crystallization principle to be concentrated further by the syrup of clarification in boiling pan, so that the sucrose in syrup generates solid crystal to greatest extent and separates out.Sugar boiling process is very complicated, by manufacturing technique requirent, need be divided into from charging, concentrated, seeding, whole crystalline substance to boiling several stages such as sugar.
For a long time, sugar enterprise only focuses on the economy of front-end investment, very limited to the input of Automation of Manufacturing Process, understanding for automatic production still rests on the seventies and eighties in last century traditional control mode, the boiling pan in a lot of sugar refinery is even only equipped with in situ temperature meter and tensimeter, boil sugar and operate in the operating experience very large degree relying on and boils sugared work long term accumulation, adopt manual hand manipulation, when operating, operator will according to material in production process, vapour pressure, the changes such as vacuum tightness, regulated valve controls scouring process at any time, level of automation is low.And, this operation under the same conditions different skill level operator cook come sugared quality also have difference; Secondly owing to boiling the difference of sugar level, usually can not realize obtaining with lower energy consumption higher boil sugared efficiency and best boiling saccharic amount, there is the level difference because of operator, or scouring process poor controllability, casualty ratio of accidents that the uncertain factor of manually-operated randomness and working conditions change causes are high, water consumption is large, energy consumption is large, boil sugar time long shortcoming, have impact on the stability of quality product; Moreover can not report to the police timely when there is accident, accident analysis ability is low, and reliability and security are not high.
Domestic patent database disclosed some patented technologies about boiling pan automatic control system in recent years:
Such as: patent documentation [application number] CN 2012104324373, open (bulletin) number [CN102925593B], this publication discloses one and " boils sugared automatic control device ".This boils sugared automatic control device and comprises vacuum degree control module, massecuite brix control module, heating steam pressure control module and boiling pan Liquid level module, wherein vacuum degree control is measured the vacuum tightness of boiling pan, regulates condenser inlet recirculated water variable valve thus control vacuum tightness with DCS; Massecuite brix controls to be the brix being measured syrup by concentration meter, and control feed valve, water intaking valve by DCS and boil the sugar time, it is by pressure transmitter measurement boiling pan vapour pressure that heating steam pressure controls, and controls with DCS the heating steam amount entering boiling pan; Boiling pan Liquid level is the liquid level of the syrup being measured boiling pan by fluid level transmitter, controls boiling pan charging, inlet valve by DCS.This invention does not carry out automatic business processing to agitator, if by manual operation agitator, easily can occur artificial error, sugared effect is boiled in impact, can not report to the police timely if there is during accident meanwhile, reliability and security low.
Summary of the invention
The object of the present invention is to provide that a kind of cane sugar boiling and crystal efficiency is high, operation labour intensity is little, level of automation be high, casualty ratio of accidents is low, reliability and the high cane sugar factory interval boiling pan automatic control system of security.
In order to achieve the above object, the present invention solves the technical scheme that its technical problem takes: cane sugar factory interval boiling pan automatic control system, comprises PLC control system, vacuum pressure transmitter, vacuum breaker, steam regulating valve, water intaking valve, feed valve, agitator; Described PLC control system comprises vacuum degree control module, Steam pressure control module, alarm control module, Liquid level module, massecuite brix control module, mixing control module, and described vacuum degree control module reads the vacuum tightness information of boiling pan by vacuum pressure transmitter and controls the Kai Heguan of vacuum breaker according to this information by PLC.
Above-described Steam pressure control module connects vapor pressure transmitter, steam regulating valve respectively, vapor pressure transmitter is connected with the capillary pressure force measuring instrument for measuring boiling pan vapour pressure force value, be sent to Steam pressure control module after the vapour pressure force value that capillary pressure force measuring instrument records by vapor pressure transmitter converts signal to and carry out PLC comprehensive treating process, controlled the Kai Heguan of steam regulating valve by Steam pressure control module according to signal PLC.
Above-described alarm control module is connected with warning howler, and alarm control module is according to setup parameter PLC control alarm equipment alarm and by alarm message real-time online record.
Above-described Liquid level model calling has liquid level difference pressure transmitter, liquid level difference pressure transmitter is connected with the intelligent telemetering differential pressure levelmeter for measuring boiling pan differential pressure level value, be sent to Liquid level module after the differential pressure level value that intelligent telemetering differential pressure levelmeter records by liquid level difference pressure transmitter converts signal to and carry out PLC comprehensive treating process, described massecuite brix control module is connected with Ha Er Carson HK6 type microwave concentration meter, the Kai Heguan of Liquid level module, massecuite brix control module co-controlling water intaking valve, feed valve.
Above-described mixing control module is connected with massecuite brix control module, and mixing control module is also connected with current transducer, and current transducer is connected with agitator; Brix signal is sent to mixing control module by described massecuite brix control module, and mixing control module controls the speed of agitator by current transducer according to this signal.
Further, described PLC control system also comprises unloads sugared control module, unloads sugared control module and is connected with valve with sugar, unloads the Kai Heguan that sugared control module PLC controls valve with sugar.
Further, described vacuum breaker is arranged on condenser inlet circulating pipe.
Further, described PLC control system also has information record, print-on-alarm, accident recollect printing, SOE printing and periodicity Reports module.
Further, described variable valve or switch-valve adopt pneumavalve.
Cane sugar factory interval boiling pan automatic control system of the present invention has following beneficial effect:
(1) level of automation is high.Take PLC control system as core, with vacuum degree control module, Steam pressure control module, Liquid level module, massecuite brix control module, mixing control module and the organic assembling of unloading the control subsystem that sugared control module forms, achieve and automatically boil sugar, effectively improve the reliability and economic benefit of boiling sugar control, significantly reduce water consumption, the steam consumption, reduce mishandle, reduce casualty ratio of accidents, improve candy output.
(2) controlling functions is powerful, and reliability is high.The various redundancy and the PLC that have employed PLC adopt software module configuration method, eliminate the connection wire in conventional system, the various controlling functions of classical control system can not only be realized, and the system optimizing control of various complexity and various logic reasoning and Logic judgment can also be completed, to achieve efficiently, on-line Control, maintenance easily; Meanwhile, modular construction makes individual loops or cell failure to affect the overall situation, and in module, the Highgrade integration of components and parts and strict screening effectively ensure that reliability and the security of Controlling System, make equipment be in optimal operating condition.
(3) casualty ratio of accidents is low.Adopt alarm control module, make PLC have perfect Operating Guideline and accident analysis means, when operation condition occurs abnormal, carry out the running of override function on the one hand, provide correlation parameter, trend, chart to notify that operations staff processes in time on the one hand; Meanwhile, the modules such as the record record had, print-on-alarm, accident recollect printing, SOE printing and periodicity form, contribute to daily administration and the accident analysis of equipment.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is cane sugar factory of the present invention interval boiling pan automatic control system schematic diagram.
In figure, 1-PLC control system; 101-vacuum degree control module; 102-Steam pressure control module; 103-alarm control module; 104-Liquid level module; 105-massecuite brix control module; 106-mixing control module; 107-unload sugared control module; 2-vacuum pressure transmitter; 3-vacuum breaker; 4-vapor pressure transmitter; 5-capillary pressure force measuring instrument; 6-steam regulating valve; 7-warning howler; 8-liquid level difference pressure transmitter; 9-intelligent telemetering differential pressure levelmeter; 10-water intaking valve; 11-feed valve; 12-microwave concentration meter; 13-current transducer; 14-agitator; 15-valve with sugar.
Embodiment
As shown in Figure 1, cane sugar factory interval boiling pan automatic control system of the present invention, comprises PLC control system 1, vacuum pressure transmitter 2, vacuum breaker 3, steam regulating valve 6, water intaking valve 10, feed valve 11, agitator 14, described PLC control system 1 comprises vacuum degree control module 101, Steam pressure control module 102, alarm control module 103, Liquid level module 104, massecuite brix control module 105, mixing control module 106, described vacuum degree control module 101 reads the vacuum tightness information of boiling pan by vacuum pressure transmitter 2 and controls the Kai Heguan of vacuum breaker 3 according to this information by PLC, reach the object automatically regulating vacuum tightness, this employing software module configuration method, eliminate the connection wire in conventional system, the various controlling functions of classical control system can not only be realized, and the system optimizing control of various complexity and various logic reasoning and Logic judgment can also be completed, achieve efficient, on-line Control easily, safeguard.
Described Steam pressure control module 102 connects vapor pressure transmitter 4 respectively, steam regulating valve 6, vapor pressure transmitter 4 is connected with the capillary pressure force measuring instrument 5 for measuring boiling pan vapour pressure force value, be sent to Steam pressure control module 102 after the vapour pressure force value that capillary pressure force measuring instrument 5 records by vapor pressure transmitter 4 converts signal to and carry out PLC comprehensive treating process, controlled the Kai Heguan of steam regulating valve 6 according to signal PLC by Steam pressure control module 102, this design is the vapor pressure set(ting)value needed for each section of sugar boiling process, boiling sugar by Steam pressure control module 102 fine adjustment needs heating vapour amount to obtain stable heating steam pressure.
Described alarm control module 103 is connected with warning howler 7, alarm control module 103 controls warning howler 7 according to setup parameter PLC and to report to the police and by alarm message real-time online record, namely when alarm control module 103 receive a certain parameter exceed the threshold value preset time, warning howler 7 one signals can be fed back to, make it ring and remind staff, meanwhile, alarm message under alarm control module 103 online record, provides inquiry to facilitate, analyzes.
Described Liquid level module 104 is connected with liquid level difference pressure transmitter 8, liquid level difference pressure transmitter 8 is connected with the intelligent telemetering differential pressure levelmeter 9 for measuring boiling pan differential pressure level value, be sent to Liquid level module 104 after the differential pressure level value that intelligent telemetering differential pressure levelmeter 9 records by liquid level difference pressure transmitter 8 converts signal to and carry out PLC comprehensive treating process, described massecuite brix control module 105 is connected with Ha Er Carson HK6 type microwave concentration meter 12, the Kai Heguan of Liquid level module 104, massecuite brix control module 105 co-controlling water intaking valve 10, feed valve 11.Described microwave concentration meter 12 also can adopt the concentration meter of model BERTHOLD BMA type.This design measures the boiling pan liquid level needed for each section of sugar boiling process by intelligent telemetering differential pressure levelmeter 9, the brix of boiling pan is measured by Ha Er Carson HK6 type microwave concentration meter 12, when boiling pan liquid level, brix generation minor fluctuations, intelligent telemetering differential pressure levelmeter 9, microwave concentration meter 12 to obtain stable liquid level, brix, improve the quality of boiling pan crystallization according to detected result automatic regulating water inlet valve 10, feed valve 11.
Described mixing control module 106 is connected with massecuite brix control module 105, and mixing control module 106 is also connected with current transducer 13, and current transducer 13 is connected with agitator 14; Brix signal is sent to mixing control module 106 by described massecuite brix control module 105, mixing control module 106 controls the speed of agitator 14 by current transducer 13 according to this signal, this brix according to massecuite regulates stirring velocity, to improve convection current and heat exchange, thus sugared effect is better boiled in acquisition.
As a further improvement on the present invention, described PLC control system 1 also comprises unloads sugared control module 107, unload sugared control module 107 and be connected with valve 15 with sugar, unload the Kai Heguan that sugared control module 107PLC controls valve 15 with sugar, namely unload sugared control module 107 to receive boiling pan and completed can feed back to valve with sugar 15 1 signals and control valve 15 with sugar when boiling sugared information and open, reach the object of automatically unloading sugar.
As a further improvement on the present invention, described vacuum breaker 3 is arranged on condenser inlet circulating pipe.
As a further improvement on the present invention, described PLC control system 1 also has information record, print-on-alarm, accident recollect printing, SOE printing and periodicity Reports module.
As a further improvement on the present invention, described variable valve or switch-valve adopt pneumavalve.
Embodiment:
To boil sugar order according to technique and be divided into some intervals, the pre-set standard program in each interval, follow procedure calls calling in sequentially of each Analog control modules, or opens and closes by each corresponding switch-valve of the Time sequence control of setting.
After boiling pan completes cleaning and vacuum pumping, controlled automatically to call in vacuum degree control module 101 by PLC control system, high-precision vacuum pressure transmitter 2 delivers to vacuum degree control module 101 by detecting the vacuum tightness signal obtained, then according to the aperture of boiling pan vacuum tightness set(ting)value fine adjustment vacuum breaker 3, thus obtain stable boiling pan vacuum tightness and boil sugared temperature, avoid the unstable of operative employee's operation.
After boiling pan completes feed operation, controlled automatically to call in massecuite brix control module 105 by PLC control system, the result of detection is delivered to massecuite brix control module 105 by microwave concentration meter 12, according to the aperture of boiling sugared each stage brix set(ting)value fine adjustment water intaking valve 10 and feed valve 11, to obtain stable brix.Meanwhile, massecuite brix control module 105 is according to boiling each interval standard program of sugared process selecting, and according to the curve preset in system, the aperture of adjustment water intaking valve 10 and feed valve 11, completes growing the grain and concentration process automatically automatically.
Simultaneously, brix signal is sent to mixing control module 106 by massecuite brix control module 105, the brix set(ting)value of mixing control module 106 needed for each section of sugar boiling process controls the speed of agitator 14 by current transducer 13, to improve convection current and heat exchange, thus sugared effect is better boiled in acquisition.
The heating steam pressure value that capillary pressure force measuring instrument detects by high-precision vapor pressure transmitter 4 delivers to Steam pressure control module 102, the aperture of the vapor pressure set(ting)value fine adjustment steam regulating valve 7 then needed for each section of sugar boiling process, thus obtain stable heating steam pressure, ensure that the quality of product, it also avoid the waste of the energy simultaneously, reach energy-saving and cost-reducing object.
The liquid syrup place value that intelligent telemetering differential pressure levelmeter 9 detects by high-precision liquid level difference pressure transmitter 8 delivers to Liquid level module 104, then the syrup liquid level set(ting)value fine adjustment water intaking valve 10 needed for each section of sugar boiling process and feed valve 11 aperture, thus obtain accurate boiling pan liquid level.
Unload each signal that sugared control module 107 receives boiling pan, and control valve 15 with sugar according to preset value and open, reach the object of automatically unloading sugar.
Boiling pan in the course of the work, when alarm control module 103 receive a certain parameter exceed the threshold value preset time, warning howler 7 one signals can be fed back to, make it ring and remind staff, meanwhile, alarm message under alarm control module 103 online record, provides inquiry to facilitate, analyzes.
Application Example: the boiling pan of Guangxi candy companies, manual shift steam was adopted before 2013, hot water and vacuum tightness, sugar boiling process is wayward, need operative employee 8 hours ceaselessly each valve of switch, labour intensity is very large, also must be familiar with very much the workman operated, within 2014, utilize cane sugar factory of the present invention interval boiling pan automatic control system, full automatic control is carried out to intermittent type boiling pan, sugar order will be boiled according to technique and be divided into some intervals, the pre-set standard program in each interval, follow procedure calls each Analog control subsystem, or open and close by each corresponding switch-valve of the Time sequence control of setting, achieve the cleaning of boiling pan, vacuumize, the automatic control of charging and blowing etc.Cane sugar factory of the present invention interval boiling pan automatic control system, through squeezing the actual motion in season, and is manually boiled compared with sugar, embodies obvious superiority:
| Sequence number | Performance index | Parameter |
| 1 | Efficiency | The automatic PLC of the present invention boils sugared Controlling System and manually boils sugared phase specific efficiency and improve 10% |
| 2 | Boil the sugar time | The present invention automatic PLC pan-boiling system is than manually boiling sugar fast 10 minutes |
| 3 | Water-saving rate | Water-saving rate reaches more than 50% |
| 4 | Energy-conservation | Energy-conservation more than 30% |
| 5 | Joint vapour | Joint vapour reaches 30% |
| 6 | Quality | The automatic PLC of the present invention boils that the product colour that sugared Controlling System produces is stable, uniform particles, better and stablize than manual operation quality |
Claims (5)
1. a cane sugar factory interval boiling pan automatic control system, comprises PLC control system (1), vacuum pressure transmitter (2), vacuum breaker (3), steam regulating valve (6), water intaking valve (10), feed valve (11), agitator (14); Described PLC control system (1) comprises vacuum degree control module (101), Steam pressure control module (102), alarm control module (103), Liquid level module (104), massecuite brix control module (105), mixing control module (106), and described vacuum degree control module (101) reads the vacuum tightness information of boiling pan by vacuum pressure transmitter (2) and controlled the Kai Heguan of vacuum breaker (3) according to this information by PLC; It is characterized in that:
Described Steam pressure control module (102) connects vapor pressure transmitter (4), steam regulating valve (6) respectively, vapor pressure transmitter (4) is connected with the capillary pressure force measuring instrument (5) for measuring boiling pan vapour pressure force value, vapor pressure transmitter (4) is sent to Steam pressure control module (102) after converting the vapour pressure force value that capillary pressure force measuring instrument (5) records to signal and carries out PLC comprehensive treating process, is controlled the Kai Heguan of steam regulating valve (6) by Steam pressure control module (102) according to signal PLC;
Described alarm control module (103) is connected with warning howler (7), and alarm control module (103) is according to setup parameter PLC control warning howler (7) warning and by alarm message real-time online record;
Described Liquid level module (104) is connected with liquid level difference pressure transmitter (8), liquid level difference pressure transmitter (8) is connected with the intelligent telemetering differential pressure levelmeter (9) for measuring boiling pan differential pressure level value, and liquid level difference pressure transmitter (8) is sent to Liquid level module (104) after converting the differential pressure level value that intelligent telemetering differential pressure levelmeter (9) records to signal and carries out PLC comprehensive treating process; Described massecuite brix control module (105) is connected with Ha Er Carson HK6 type microwave concentration meter (12), the Kai Heguan of Liquid level module (104), massecuite brix control module (105) co-controlling water intaking valve (10), feed valve (11);
Described mixing control module (106) is connected with massecuite brix control module (105), and mixing control module (106) is also connected with current transducer (13), and current transducer (13) is connected with agitator (14); Brix signal is sent to mixing control module (106) by described massecuite brix control module (105), and mixing control module (106) controls the speed of agitator (14) by current transducer (13) according to this signal.
2. cane sugar factory interval boiling pan automatic control system according to claim 1, it is characterized in that: described PLC control system (1) also comprises unloads sugared control module (107), unload sugared control module (107) and be connected with valve with sugar (15), unload the Kai Heguan that sugared control module (107) PLC controls valve with sugar (15).
3. cane sugar factory interval boiling pan automatic control system according to claim 1, is characterized in that: described vacuum breaker (3) is arranged on condenser inlet circulating pipe.
4. cane sugar factory interval boiling pan automatic control system according to claim 1, is characterized in that: described PLC control system (1) also has information record, print-on-alarm, accident recollect printing, SOE printing and periodicity Reports module.
5. cane sugar factory interval boiling pan automatic control system according to claim 1, is characterized in that: described variable valve or switch-valve adopt pneumavalve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510364534.7A CN104946802A (en) | 2015-06-29 | 2015-06-29 | Automatic control system of intermittent sugar boiling containers in cane sugar factories |
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| CN201510364534.7A CN104946802A (en) | 2015-06-29 | 2015-06-29 | Automatic control system of intermittent sugar boiling containers in cane sugar factories |
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| CN201510364534.7A Pending CN104946802A (en) | 2015-06-29 | 2015-06-29 | Automatic control system of intermittent sugar boiling containers in cane sugar factories |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054732A (en) * | 2016-07-11 | 2016-10-26 | 华南理工大学 | Sugar refinery boiling-off section powder feeding grain growing control device and method |
| CN109504809A (en) * | 2018-12-12 | 2019-03-22 | 中国轻工业南宁设计工程有限公司 | Sugaring falling film evaporation intelligence control system |
| CN111235325A (en) * | 2020-03-27 | 2020-06-05 | 钦州华成自控设备有限公司 | Automatic sugar boiling control system and method for sugar refinery |
| CN112322799A (en) * | 2020-10-21 | 2021-02-05 | 湖南新中意食品有限公司 | Intelligent control system for water evaporation in sugar production process |
| CN112346428A (en) * | 2020-11-24 | 2021-02-09 | 航天云网数据研究院(广东)有限公司 | Intelligent control method of product processing technology, cockpit and related equipment |
| US11441199B2 (en) * | 2019-04-25 | 2022-09-13 | Les Équipements Lapierre Inc. | Controller of the release of energy of a combustion of biomass, system provided with such a controller, kit for assembling the same, and corresponding methods of assembling, operating and use associated thereto |
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| CN203065492U (en) * | 2012-11-02 | 2013-07-17 | 中国轻工业南宁设计工程有限公司 | Automatic sugar cooking control device |
| CN103365274A (en) * | 2013-07-09 | 2013-10-23 | 广西宏智科技有限公司 | Automatic control system for clarification and evaporating process of sugar refinery |
| CN104571161A (en) * | 2014-12-23 | 2015-04-29 | 广西贵糖（集团）股份有限公司 | Automatic liquid level control system for sugarcane juice steaming tank |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054732A (en) * | 2016-07-11 | 2016-10-26 | 华南理工大学 | Sugar refinery boiling-off section powder feeding grain growing control device and method |
| CN109504809A (en) * | 2018-12-12 | 2019-03-22 | 中国轻工业南宁设计工程有限公司 | Sugaring falling film evaporation intelligence control system |
| US11441199B2 (en) * | 2019-04-25 | 2022-09-13 | Les Équipements Lapierre Inc. | Controller of the release of energy of a combustion of biomass, system provided with such a controller, kit for assembling the same, and corresponding methods of assembling, operating and use associated thereto |
| US11859258B2 (en) | 2019-04-25 | 2024-01-02 | Les Équipements Lapierre Inc. | Controller of the release of energy of a combustion of biomass, system provided with such a controller, kit for assembling the same, and corresponding methods of assembling, operating and use associated thereto |
| CN111235325A (en) * | 2020-03-27 | 2020-06-05 | 钦州华成自控设备有限公司 | Automatic sugar boiling control system and method for sugar refinery |
| CN112322799A (en) * | 2020-10-21 | 2021-02-05 | 湖南新中意食品有限公司 | Intelligent control system for water evaporation in sugar production process |
| CN112346428A (en) * | 2020-11-24 | 2021-02-09 | 航天云网数据研究院(广东)有限公司 | Intelligent control method of product processing technology, cockpit and related equipment |
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