CN102734164B - Intelligent control system of air-cooled screw air compressor - Google Patents
Intelligent control system of air-cooled screw air compressor Download PDFInfo
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Abstract
The invention relates to an intelligent control system of an air-cooled screw air compressor, which is connected with an air compressor system and a user centralized control system, and comprises a PLC programmable logic controller, a fan frequency converter, a temperature sensor, a pressure sensor and a touch screen. The temperature sensor and the pressure sensor are connected with four paths of analog quantity input modules through shielded cables, and then are connected with a CPU central control unit. The PLC is connected with the four paths of the analog quantity input module; the first path of the analog quantity input module is connected with the fan frequency converter through a shielded cable; the frequency converter is connected with a fan motor of the air compressor system; the second and third paths of the analog quantity input modules are respectively connected with a compressor unit protective device; and the four path of the analog quantity input module is connected a compressor motor. The intelligent control system realizes the functions of settable user pressure control, PID closed-loop control of a cooling fan, switching of manual and automatic control functions, setting of control parameters on a display screen, displaying of measurement parameters and alarm parameters on the display screen, communication meeting standard communication protocol requirements, and the like.
Description
Technical field
The present invention relates to the intelligent control system of helical-lobe compressor, specifically relate to the air-cooled screw air compressor intelligent control system intelligent automatic control system of a kind of control able to programme (PLC) and man-machine interface (HMI).
Background technique
Due to the extensive use of pressurized air in industrial field, air compressor becomes requisite key equipment in industrial department flow process, it not only can be supplied with the air of its required pressure, and can supply with its required raw air for separation equipment for instrument, automation equipment; Meanwhile, air compressor or high-energy equipment, its power consumption can reach China's gross generation approximately 15%.Along with the arrival of global energy crisis, countries in the world government is all in the power-saving technology of actively promoting the energy for realizing its continuable economic development, and wherein compressed air system has obtained vast concern.
Traditional screw compressor is conventionally as adopted air-cooled form, and general power can only be accomplished 250KW.In some large-scale mines, power plant, chemical industry, due to lack of water, conventionally need to adopt air-cooledly, and its gas consumption is very large, more and more needs the large-scale screw rod air-cooled compressor of 315KW-500KW.But because Chinese Regional is very large, ambient temperature is very large in the north, south, the temperature difference in summer in winter.Avoid shutting down because excessive discharge temperature causes malfunction alarm summer in order to ensure south, often configure greatlyr to cooler, cooling blower, blower fan only has Push And Release two states, can not adjust output power according to delivery temperature actual conditions, has wasted the energy; And air compressor is substantially all used traditional nonshared control unit; this controller measurement and control point are very limited; cannot all include control system in to details measuring control points all in motor and air compressor technological process; bring a lot of potential faults to air compressor system; increase the possibility of disorderly closedown; also carry out lot of unstable factor to user with the band of gas, as owing to having brought economic loss for unsaturated vapor.
In addition, traditional director demon solidifies, it is consistent that hardware is produced completely curing with it software, cause hardware and software version very many, cannot increase and control function by user's requirement, bring a lot of inconvenience to design control system, can only meet part by the complexity that increases circuit like this and control requirement, the serious probability of failure that increases control system circuit pack in running, brings inconvenience to maintenance maintenance.
Technology based on above and control mode; traditional control system of air compressor is for the air compressor unit of severe cold environment; the cooler supercooling of long term exposure in atmosphere; lubricating oil viscosity is wherein too high; lubricant oil when unit starting in cooler is difficult for flowing; thereby make the fuel injection quantity of head too low, the unit after having started loads and causes head high temperature alarm to be shut down.
In view of this, seek a kind of screw air compressor intelligent control system and become pursuing a goal of these those skilled in the art.
Summary of the invention
Task of the present invention is to provide a kind of air-cooled screw air compressor intelligent control system, it has overcome the difficulty of prior art, there is the user's pressure control that can set, blower fan is realized closed loop VFC (PID), according to the setting of the height of delivery temperature and target temperature, adjust output power, saved the energy.
Technical solution of the present invention is as follows:
A kind of air-cooled screw air compressor intelligent control system, it connects air compressor system and user's centralized control system, and described intelligent control system comprises PLC programmable controller (1), fan frequency converter (2), temperature transducer, pressure transducer and touch screen (3);
Described PLC programmable controller (1) comprises power supply, CPU central control unit, expansion module and 9 pin RS485 communication ports, and described 9 pin RS485 communication ports are connected with user's centralized control system by communication cable;
Described temperature transducer is connected four road analog input modules with pressure transducer by shielded cable, then connects CPU central control unit by flat cable;
Described PLC programmable controller (1) connects first via analog input module (41), the second road analog input module (42), Third Road analog input module (43) the He tetra-road analog input modules (44) in four road analog input modules according to the order of sequence;
Described first via analog input module (41) is by shielded cable connecting fan frequency variator (2), frequency variator (2) connects the blower motor (11) of air compressor system, and described first via analog input module (41) connects again the Compressor Group protective gear (12) of air compressor system;
Described the second road analog input module (42) connects the Compressor Group protective gear (12) of air compressor system by shielded cable, described the second road analog input module (42) connects again the compressor motor (13) of air compressor system;
Described Third Road analog input module (43) connects the Compressor Group protective gear (12) of air compressor system by shielded cable, described Third Road analog input module (43) connects again the compressor motor (13) of air compressor system;
Described Si road analog input module (44) connects the compressor motor (13) of air compressor system by shielded cable;
Described touch screen (3) connects PLC programmable controller (1) by communication cable.
Set temperature signal feed back between described first via analog input module (41) and frequency variator (2).
Described first via analog input module (41) and the middle pressure signal measuring point that arranges of being connected of Compressor Group protective gear (12).
Described the second road analog input module (42) and the middle pressure signal measuring point that arranges of being connected of Compressor Group protective gear (12).
Described the second road analog input module (42) arranges pressure signal measuring point with the centre that is connected of compressor motor (13), and motor three-phase current signal feedback is set between described the second road analog input module (42) and compressor motor (13) simultaneously.
Described Third Road analog input module (43) and middle exhaust-system-oil spout temperature signal measurement point that arranges of being connected of Compressor Group protective gear (12).
Described Third Road analog input module (43) and the middle motor winding temperature signal measurement point that arranges of being connected of compressor motor (13).
Described Si road analog input module (44) and being connected of compressor motor (13) middle arrange motor front and back bearings temperature and motor winding temperature signal measurement point.
Described PLC programmable controller (1) also connects other control sections of air compressor by multi-core controlled cable.
Between described fan frequency converter (2) and PLC programmable controller (1), it is closed loop VFC.
The functions such as that air-cooled screw air compressor intelligent control system of the present invention possesses is simultaneously energy-conservation, protection and supervision.The present invention has the user's pressure control that can set, and blower fan is realized closed loop VFC (PID), according to the setting of the height of delivery temperature and target temperature, adjusts output power, has saved the energy.
The present invention has the optional function of special increase: while having got rid of startup, chiller temperature is too low, lubricating oil viscosity is too high, head temperature is too high, start failed possibility; Press air compressor technological requirement, realize PLC control able to programme completely, protection air compressor machine set system and motor itself, the switching function that has manually and automatically control, the switching function of long-range and local control; Controlling parameter can arrange on display screen, and the measurement parameters such as exhaust pressure, delivery temperature and injection pressure all show on display screen HIM; Can increase and control function by user's requirement, reach maintenance maintenance convenient and swift, reduce the possibility of disorderly closedown; Stablize air feed, improve production work efficiency.
The present invention utilizes Siemens S7-200PLC and expansion module to include one by one measurement concrete in air compressor technological process and control point in control system, comprises all protections of motor in air compressor unit.The present invention has overcome the defect of only having exhaust pressure and delivery temperature measuring point in traditional air compressor nonshared control unit, for the protection of motor also more comprehensively, such as the conversion of passing through in control system the measurement of motor three phase circuit and standard signal, overload, stall, phase shortage, short circuit and the three-phase current unbalance of real-time judge motor; By the measurement to motor front and back bearings temperature and measuring temperature of three-phase winding, system accurately judges measuring point early warning and warning stopping signal.The mechanical part protection of air compressor unit is more sound, and such as passing through the measurement to supply gas pressure, system pressure, injection pressure, the pressure of each several part in the technological process of intelligent control air compressor, avoids overpressure damage equipment and jeopardize personal security; By measurement and the intelligent decision of delivery temperature and system temperature, provide and meet the gas temperature that user requires.
In intelligent control system of the present invention, air compressor wind cooling blower is VFC, by calling the PID closed loop control function of frequency variator, realize according to the setting of the height of air compressor delivery temperature and oil spout temperature and target oil spout temperature, adjust frequency conversion frequency, change output power, energy saving.The height of oil spout temperature is fed back to frequency variator by intelligent control system, frequency variator compares the oil spout temperature of this temperature and setting in real time, change in real time frequency conversion frequency and output power, reduce the possibility that stops blower fan, drive blower fan to freeze to air compressor system, meet the temperature requirement specifying in system process.The target oil spout temperature of setting in frequency variator, can suitably adjust height according to different unit sizes in PID loop control theory and industry.
Control system of the present invention has increased optional function; the measurement of system temperature while startup by ambient temperature or unit; under severe cold environment; start after unit, loaded a period of time to unload a period of time simultaneously and repeatedly carry out (this time all can be set on touch screen), until system temperature raises; in cooler, lubricating oil temperature raises; when injection pressure rises simultaneously, meet and adding unloading while requiring under the home after unit starting, this function finishes.
The present invention is for UD400A type air-cooled screw air compressor intelligent control system.Intelligent control system is pressed air compressor protection needs, early warning and the warning of the each measuring point of logic control respectively, and early warning is pointed out user with the form of early warning signal, and does not stop unit.When alarm and protection, compressor emergency shutdown, the size of early warning value and alarming value all can be set and change on the Kunlun on-state color touch screen, and operation and maintenance is convenient, and the unit of not working when applicable low temperature environment is long simultaneously starts requirement first.In addition, this control system avoids blower fan in tradition control according to the height of delivery temperature, to open or to close, and frequent starting, has seriously shortened electrical endurance, and the state of opening can only, by the output of rated power full power, not only waste energy but also intelligent not.
Air-cooled screw air compressor intelligent control system of the present invention has following characteristics:
1, MCGS color touch is shielded the parameter that shows in real time all measuring points on main interface, comprises compressor operation time and the air compressor load time of calculating by program.
2, log in password and be divided into user cipher and producer's password by rank, select user or producer at log-in interface, input corresponding password and can revise customer parameter and producer's parameter, the protection value when changing due to power of the assembling unit size and working conditions change.
3, interface is provided with manually and automatically moves throw over switch.Select when manual, can manually add unloading; Select when automatic, the upper pressure limit that unit is set according to user and low pressure limit load and unloading automatically.
4, user can click customer parameter and arrange the maintenance parameters preview button in the upper left corner, interface, and working time and the remaining time of checking lubricant oil, lubricating grease, air filter, oil strainer, deaerator, so that maintaining in time.After maintaining, can be by reset button, remove zero clearing working time of these parts, start from scratch and recalculate working time, wait for maintaining next time.
5, in producer's parameter except setting the parameter such as early warning and alarming, starting protection; can also click historical warning navigation button; check the All Alerts having occurred since unit operation; can retrieve user or producer wants the historical failure of searching by the time, so that maintenance and fix a breakdown, analyze the ride quality etc. of unit.
6,, at real-time curve interface, can observe the real-time change trend of the curves such as exhaust pressure, delivery temperature, system pressure, system temperature, oil spout temperature, to judge the runnability of unit.
7, MODBUS communication program writes PLC system routinely, and this system can access DCS centralized control system by the mode of communication at any time, as substation work, important parameter is transferred in the middle of DCS system; The access of the passive contact signal of hardwire also for subsequent use and remote switch amount; normal start and stop unit and transmit the various states of unit to centralized control system in the time of communication failure; such as run signal, trouble signal, early warning signal etc., convenient operation person's monitoring and operation.
8, there is optional function: in not increasing mechanical hardware, overcome under low temperature environment, start when unit because lubricating oil temperature is low, viscosity disaster flows, the shortcoming that causes head high temperature alarm tightly to stop.
Brief description of the drawings
Fig. 1 is the connection schematic diagram that a kind of air-cooled screw air compressor intelligent control system of the present invention is specially power frequency air compressor intelligent control system.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Referring to Fig. 1, the invention provides a kind of air-cooled screw air compressor intelligent control system, it is connected with air compressor system and user's centralized control system, and this intelligent control system is mainly made up of PLC programmable controller 1, fan frequency converter 2, temperature transducer, pressure transducer and touch screen 3.
PLC programmable controller 1 comprises power supply, CPU central control unit, expansion module and 9 pin RS485 communication ports, and 9 pin RS485 communication ports are connected with user's centralized control system by communication cable.Temperature transducer is connected four road analog input modules with pressure transducer by shielded cable, then connects CPU central control unit by flat cable.
PLC programmable controller 1 connects first via analog input module 41, the second road analog input module 42, the Third Road analog input module 43 He tetra-road analog input modules 44 in four road analog input modules according to the order of sequence.
First via analog input module 41 is by shielded cable connecting fan frequency variator 2, and frequency variator 2 connects the blower motor 11 of air compressor system, and first via analog input module 41 connects again the Compressor Group protective gear 12 of air compressor system.Set temperature signal feed back between first via analog input module 41 and frequency variator 2.First via analog input module 41 and the middle pressure signal measuring point that arranges of being connected of Compressor Group protective gear 12.Between fan frequency converter 2 and PLC programmable controller 1, it is closed loop VFC.
Compressor Group protective gear 12, the second road analog input modules 42 that the second road analog input module 42 connects air compressor system by shielded cable connect again the compressor motor 13 of air compressor system.The second road analog input module 42 and the middle pressure signal measuring point that arranges of being connected of Compressor Group protective gear 12.The second road analog input module 42 arranges pressure signal measuring point with the centre that is connected of compressor motor 13, and motor three-phase current signal feedback is set between the second road analog input module 42 and compressor motor 13 simultaneously.
Third Road analog input module 43 connects the Compressor Group protective gear 12 of air compressor system by shielded cable, Third Road analog input module 43 connects again the compressor motor 13 of air compressor system.Third Road analog input module 43 and middle exhaust-system-oil spout temperature signal measurement point that arranges of being connected of Compressor Group protective gear 12.Third Road analog input module 43 and the middle motor winding temperature signal measurement point that arranges of being connected of compressor motor 13.
Si road analog input module 44 connects the compressor motor 13 of air compressor system by shielded cable.Si road analog input module 44 and being connected of compressor motor 13 middle arrange motor front and back bearings temperature and motor winding temperature signal measurement point.
Touch screen 3 connects PLC programmable controller 1 by communication cable.PLC programmable controller 1 also connects other control sections of air compressor by multi-core controlled cable.
In actual applications, air-cooled screw air compressor intelligent control system of the present invention can be made up of touch screen, multi-core controlled cable, PLC control system, PLC expansion module, frequency variator and temperature, pressure transducer etc.
PLC control system comprises power supply, CPU, expansion module and 9 pin RS485 communication ports.User DCS centralized control center connects 9 pin RS485 communication ports by communication, gathers all measurements and controls parameter.Pressure, temperature transducer connect 4 road analog inputs by shielded cable, between expansion module and between expansion module and CPU, are connected by flat cable.Frequency variator receives from the air compressor oil spout temperature signal of PLC system, simultaneously by real time execution frequency feedback to PLC control system.Touch screen is connected to the PORT COM of PLC control system by communication cable.Multi-core controlled cable connects respectively PLC control system and air compressor system.
PLC programmable controller is Siemens PLC C, touch screen is the Kunlun on-state touch screen, the upper program of air compressor for this intelligent control system in touch screen, and the Kunlun on-state software is housed and controls the application software needing, between touch screen and PLC, communication is connected, definition and the address of PLC programmable controller communication port, connect user's centralized control system DCS communication definition mode.
Intelligent control system of the present invention does not increase mechanical hardware, promotes lubricating oil flow in cooler in air compressor under low temperature severe cold environment, prevents head high temperature, and corresponding to the parameter setting on touch screen.
Fan frequency converter used is for converging river frequency variator, and closed loop PID control between PLC, connects and is measured as air compressor blower fan closed loop PID control, is provided with the special parameter that meets this control needs in frequency variator.
UD400A is the air-cooled air compressor unit of 400KW, is illustrated as example.Intelligent control system by Siemens S7-200 series of PLC according to the size of supply gas pressure, the upper and lower bound control of the supply gas pressure of setting according to user, be greater than in limited time when measuring supply gas pressure, intelligent control system is sent unloader signal, be less than lower prescribing a time limit when measuring supply gas pressure, intelligent control system is sent load signal.As long as after unit starting, on duty without personnel, just can be automatically intelligent work repeatedly, to meet user's air feed needs.
The optional start-up performance that is applicable to severe cold environment: by the measurement of ambient temperature or system temperature, programmable controller PLC judges whether to enable this function, general recommendations ambient temperature starts this function during lower than 15 DEG C, main purpose be prevent cooler the inside in winter lubricant oil in the time of long-time shutdown, cooler is exposed in the middle of atmosphere environment, lubricant oil supercooling, viscosity is too high, when machine startup due to the lower lubricating oil flow that is not easy to promote cooler of pressure ratio of oil tank, thereby make the fuel injection quantity of head too low, after causing compressor start, automatic loading can produce high temperature protection shutdown.Therefore this function is set, when ambient temperature is during lower than 15 DEG C, after machine startup completes, will carry out and load 15S, allow system pressure rise rapidly, and then off-load 15S, allow the temperature rise rising of machine slow down, circulation is carried out, until fan starting proceeds to normal system and automatically controls, under control now and non-low-temperature environment, control identical.
The analog measurement point of this control system has: supply gas pressure signal, system pressure signal, injection pressure signal, frequency converter frequency feedback signal, the mutually each phase current of ABC, delivery temperature, system temperature, oil spout temperature, main frame motor ABC phase measuring temperature of three-phase winding, main frame motor front and back bearings temperature.All analogue signal measuring points are equipped with break alarm function, in the time of one and multiple signal broken string or sensor damage, can in warning hurdle, show the sensor disconnection fault of corresponding measuring point.All measured values all show in real time on touch screen; and all measuring points all arrange early warning value and warning shutdown value in producer's parameter; when early warning, reminding user takes measures to avoid the further increase of undesirable element, has also avoided reporting to the police and shutting down easily, affects use gas.But when measured value is higher than warning shutdown value; for the needs of protecting; warning hurdle can show corresponding warning, and unit quits work, and after fixing a breakdown, unit is resumed work; if when unit long-time (this time can be set) not Loading opportunity group just quit work;, automatically start and load air feed, in the time that unit unloads during lower than threshold pression Deng supply gas pressure; supply gas pressure is during still higher than upper pressure limit a period of time, and the unit high time delay of pressure is shut down.
The setting of measuring point is the setting of analog input point; fully demonstrate the control marrow of air compressor industry; working principle according to system: in the time that exhaust pressure is higher; system pressure must raise; have separately the setting of early warning and alarm and protection value, not only ensured supply gas pressure need to but also the system of adequately protecting be unlikely to the high and damage equipment of pressure.Such effect has been played in the setting of injection pressure: the deficiency of pressing in system while preventing from just having started due to unit, while loading suddenly, damage head.The measurement of main frame motor three phase circuit has ensured that overload, stall, phase shortage, short circuit and three-phase current unbalance etc. appear in main frame, can shut down in time and not burn out motor.The setting of system temperature and delivery temperature, ensures not high temperature and the pressurized gas that meet user's temperature requirement of unit.The measurement of main frame motor front and back bearings temperature and measuring temperature of three-phase winding, allows motor operations at rational temperature, is unlikely to excess Temperature and damages bearing and winding.
In the middle of screw-rod air compressor air-cooled unit, cooling blower plays crucial effect, and fully the mechanical system in cooling work, meets the air feed gas temperature that user requires.Cooling blower of the present invention adopts VFC, transmit with PLC system live signal, in air compressor unit, the height of oil spout temperature passes to frequency variator by the mode of 4-20mA signal, call the PID closed loop control of frequency variator, the desired value of oil spout temperature is set in frequency variator, and the size of output frequency is adjusted in frequency conversion in real time, changes output power, by the target temperature work of setting, reduce the output of idle work.
The switching value input of this intelligent system comprises: stop in emergency, high pressure cabinet fault, phase sequence, oil cooling blower fan overload, rear air cooler overload, the action of oil strainer pressure reduction, the action of oil separator pressure reduction, the action of air filter pressure reduction, frequency converter failure etc.; in conjunction with collection and early warning and the warning of analog amount, accomplish to protect completely whole air compressor system to comprise machinery and motor etc.
In actual applications, interface is set login user parameter and producer's parameter arranges interface, sets corresponding parameter, selects manually operation or operation automatically, and after choosing, the corresponding tutorial light on touch screen can convert redness to by blueness.Manually, under running state, press start button, intelligent control system is judging that unit does not have in out of order situation, starts unit, after having started, manually adds unloading at main interface by manual loading or manual unload button.Under automatic operation conditions, system arranges startup unit by logic judgement and parameter, after having started, can, according to supply gas pressure upper and lower setting value, automatically control air inflow according to gas consumption, opens air intake valve or closes air intake valve.
In sum, air-cooled screw air compressor intelligent control system of the present invention has been realized the user's pressure control that can set, the PID closed loop control of cooling blower, manually and the switching of automatic control function, controlling parameter can arrange on display screen, and measurement parameter and alarm parameters meet the functions such as standard communications protocol requirement in communications such as showing screen display.
Certainly, those skilled in the art in the art will be appreciated that, above-described embodiment is only for the present invention is described, and not as limitation of the invention, as long as within the scope of connotation of the present invention, variation, the modification etc. of above-mentioned enforcement all will be dropped in the scope of the claims in the present invention.
Claims (4)
1. an air-cooled screw air compressor intelligent control system, it connects air compressor system and user's centralized control system, it is characterized in that: described intelligent control system comprises PLC programmable controller (1), fan frequency converter (2), temperature transducer, pressure transducer and touch screen (3), and air compressor wind cooling blower is VFC;
Described PLC programmable controller (1) comprises power supply, CPU central control unit, expansion module and 9 pin RS485 communication ports, and described 9 pin RS485 communication ports are connected with user's centralized control system by communication cable;
Described temperature transducer is connected four road analog input modules with pressure transducer by shielded cable, then connects CPU central control unit by flat cable;
Described PLC programmable controller (1) connects first via analog input module (41), the second road analog input module (42), Third Road analog input module (43) the He tetra-road analog input modules (44) in four road analog input modules according to the order of sequence;
Described first via analog input module (41) is by shielded cable connecting fan frequency variator (2), frequency variator (2) connects the blower motor (11) of air compressor system, and described first via analog input module (41) connects again the Compressor Group protective gear (12) of air compressor system;
Described the second road analog input module (42) connects the Compressor Group protective gear (12) of air compressor system by shielded cable, described the second road analog input module (42) connects again the compressor motor (13) of air compressor system;
Described Third Road analog input module (43) connects the Compressor Group protective gear (12) of air compressor system by shielded cable, described Third Road analog input module (43) connects again the compressor motor (13) of air compressor system;
Described Si road analog input module (44) connects the compressor motor (13) of air compressor system by shielded cable;
Described touch screen (3) connects PLC programmable controller (1) by communication cable;
Set temperature signal feed back between described first via analog input module (41) and frequency variator (2);
Described first via analog input module (41) and the middle pressure signal measuring point that arranges of being connected of Compressor Group protective gear (12);
Described the second road analog input module (42) and the middle pressure signal measuring point that arranges of being connected of Compressor Group protective gear (12);
Described the second road analog input module (42) arranges pressure signal measuring point with the centre that is connected of compressor motor (13), and motor three-phase current signal feedback is set between described the second road analog input module (42) and compressor motor (13) simultaneously;
Described Third Road analog input module (43) and middle exhaust-system-oil spout temperature signal measurement point that arranges of being connected of Compressor Group protective gear (12);
Between described fan frequency converter (2) and PLC programmable controller (1), it is closed loop VFC.
2. air-cooled screw air compressor intelligent control system according to claim 1, is characterized in that: described Third Road analog input module (43) and the middle motor winding temperature signal measurement point that arranges of being connected of compressor motor (13).
3. air-cooled screw air compressor intelligent control system according to claim 1, is characterized in that: described Si road analog input module (44) and being connected of compressor motor (13) middle arrange motor front and back bearings temperature and motor winding temperature signal measurement point.
4. air-cooled screw air compressor intelligent control system according to claim 1, is characterized in that: described PLC programmable controller (1) also connects other control sections of air compressor by multi-core controlled cable.
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| Publication number | Publication date |
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| CN102734164A (en) | 2012-10-17 |
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