CN101418695A - Intelligent local ventilation system - Google Patents
Intelligent local ventilation system Download PDFInfo
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- CN101418695A CN101418695A CNA2008101434642A CN200810143464A CN101418695A CN 101418695 A CN101418695 A CN 101418695A CN A2008101434642 A CNA2008101434642 A CN A2008101434642A CN 200810143464 A CN200810143464 A CN 200810143464A CN 101418695 A CN101418695 A CN 101418695A
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Abstract
Provided is an intelligent local ventilation system, which mainly solves the technical problems of bad work reliability, large volume, high cost and price, weak anti-EMI ability and the like of the conventional local ventilation system. The technical scheme is that: the intelligent local ventilation system is composed of a frequency conversion local ventilator, an intelligent switch, sensors or a down-hole signal monitoring system, the intelligent switch is provided with an acousto-optic alarm and a display and control panel, and gas, wind speed, and temperature sensors are respectively connected with the intelligent switch; the intelligent switch adopts PLC, and the signal data collected by the sensors or the down-hole signal monitoring system are transmitted to the PLC to perform analysis through intrinsic safe I/O junction box. The system performs forced cooling to frequency converter by self ventilating current of the fan, has no bulk dust on the radiating surface, little occupation space and high reliability, can realize the online control for two counter-rotating fans and can automatically switch, and is mainly suitable for mine local ventilation system.
Description
Technical field
The present invention relates to a kind of ventilation equipment that are used for, especially a kind of mining partial ventilation equipment.
Background technology
At present, domestic and international down-hole, the mine general ventilation fan that adopts single-stage, twin-stage, twin-stage to several forms such as revolving that ventilates, general equal can only " cancelling all things together " can not be realized the adjusting of air quantity, in the time of can not satisfying tunnelling, the demand of change in depth.More can not satisfy the inhomogeneous air quantity demand of gushing out of gas in the tunnelling process, the mine user generally selects the blower fan model to tunnelling by rule of thumb with ventilation fan, in order to prevent accident, some user selects for use big model booster to cause waste of energy, do not take intelligentized control measure, the intellectuality adjusting of air quantity, blast can not be realized, the effect of " energy-conservation at ordinary times, catastrophe is combated a natural disaster " can not be reached.And generally can not realize realizing the function of intelligence adjusting air quantity, blast according to dust concentration in gas density, air themperature, the air.And converter plant and booster can not be realized integrated, and system can not be integrated.
The utility model patent that my company declared in 2005 " mine intelligent local ventilation system " (patent No.: ZL2005200498009), the one, adopt external explosion-proof frequency converter+multistage to revolving booster; The 2nd, adopt the booster that intelligent switch+multistage multispeed electric machine is formed.Two kinds of forms all take too many lane space, and explosion-proof frequency converter in the down-hole owing to adopt the nature cooling, take up room big, poor reliability, and the blower fan that multistage multispeed electric machine is formed can not be realized the even regulation of air quantity, blast.Though it has adopted the frequency control scheme, can realize that the intelligence of air quantity is regulated, explosion-proof frequency converter is external, can not combine with blower fan to constitute incorporate product, and explosion-proof frequency converter is that nature cooling, functional reliability are poor.Booster adopts level Four to revolving structure, and result of use, fan efficiency all do not have two-stage good to revolving structure, and the patented product cost compares higher, and it is long to take lane space length, poor for applicability.
Summary of the invention
Take up room greatly because prior art products exists, electric energy is converted into wind energy does not have two-stage to revolving the booster height.External frequency converter can not utilize the air of booster to force cooling, can only cool off naturally by radiator, radiating efficiency is low, and at the easy laying dust of down-hole spreader surface, the frequency converter functional reliability is poor, volume is big, cost is high, price is expensive, and a little less than the anti-electromagnetic interference capability.
The purpose of this invention is to provide and a kind ofly reduced product cost, improve system reliability, reduce the intelligent local ventilation system that takes up room, increase work efficiency.
The technical solution adopted for the present invention to solve the technical problems is: it is made of frequency conversion booster, intelligent switch, sensor or underground signal monitoring system, intelligent switch is provided with audible-visual annunciator and demonstration, control panel, comprises that gas, wind speed, temperature pick up link with intelligent switch respectively; Intelligent switch adopts programmable logic controller (PLC) PLC, and the signal data of sensor or the collection of underground signal monitoring system sends programmable logic controller (PLC) PLC to by intrinsic safety I/O junction box and carries out analyzing and processing.Described intrinsic safety I/O junction box is made of non-intrinsic safety wiring terminal and intrinsic safety wiring terminal more than 2 pairs, adopt photoelectric isolating circuit to link between the every pair of non-intrinsic safety wiring terminal and the intrinsic safety wiring terminal, described photoelectric isolating circuit is by the circuit that comprises that photoelectrical coupler, diode, electric capacity and resistance constitute.
The present invention constitutes main system by frequency conversion booster, intelligent switch respectively and back-up system, 2 systems install side by side, and the communication interface of the intelligent switch of main system and 2 systems of back-up system is coupled to each other.Described frequency conversion booster adopts two counter-rotating fans, it is by current collector 1, premuffler 2, flow channel type frequency converter 3, to revolving one-level blower fan 4, connecting successively and form revolving secondary blower fan 5 and rear muffler 6, described flow channel type frequency converter 3 with on same axis, link or make an integral body revolving one-level blower fan 4, and flow channel type frequency converter 3 respectively with to revolving one-level blower fan 4 and the circuit that revolves secondary blower fan 5 being linked.Described flow channel type frequency converter 3 is to be connected by 2 half housings to form flame proof and cooperate connect firmly into closed at both ends outer to form columned transducer body 16, between the joint face of 2 half housings, be provided with flameproof joint, transducer body 16 is installed in the cross section central authorities of frequency converter air duct 17, be provided with between transducer body 16 and the frequency converter air duct 17 and support coupling arrangement 19, the wall of transducer body 16 is provided with the connection cable connection holes, frequency converter air duct 17 be provided with transducer body 16 on the corresponding junction box connection holes in connection cable connection holes position that is provided with, be installed in the outer frequency converter junction box 18 of frequency converter air duct 17 and the tie of maneuver box 20 and pass wire barrel device 21 respectively, junction box connection holes and connection cable connection holes link with the electric assembly that is installed in the transducer body 16.Intelligent switch is made of intelligent switch housing 11, intelligent switch junction box 12 and Switch main body 14, and intelligent switch junction box 12 is installed on the intelligent switch housing 11, and intelligent switch junction box 12 is provided with cable introducing device 13; Switch main body 14 is installed in the intelligent switch housing 11, Switch main body 14 is provided with communication module 9 and programmable logic controller (PLC) PLC10, intelligent switch operating grip 15 and man-machine dialog interface 7 are installed on the intelligent switch housing 11, and link with Switch main body 14, man-machine dialog interface 7 links by circuit and programmable logic controller (PLC) PLC10.
The invention has the beneficial effects as follows: it is by adopting integral structure, explosion-proof frequency converter and blower fan are combined into an integral body, utilize blower fan distinguished and admirable to frequency converter force the cooling, make radiating surface not have the laying dust phenomenon, take up room little, reliability is high, it can realize the online control of two counter-rotating fans; Be designed to the intrinsic safety of online signal; By the online modification of man-machine interface to discharge quantity of fan; Guarantee to realize the automatic switchover of two typhoon machines operation under the prerequisite of underworkings ventilation reliability; It adopts integrated fan frequency conversion arrangements for speed regulation, has both solved the frequency converter heat dissipation problem, has improved the frequency converter operational reliability, has reduced lane space again; Can realize in the course of work that air quantity regulates and safe operation automatically, can guarantee the development end wind supply quantity, but energy conservation again simultaneously.It is by adopting the combined integral RHVC, and booster adopts two-stage to revolving structure, thereby reduced product cost, improved the system works reliability, reduced system take up room, improved system works efficient, product is proper user's demand further.And converter plant can make up with the booster that the mine user is using, and can be user-friendly to, and has realized integrated and system integrated of converter plant and booster.
Description of drawings
Fig. 1 is a system architecture diagram of the present invention.
Fig. 2 is the circuit theory diagrams of intrinsic safety I/O junction box.
Fig. 3 is a RHVC operating principle block diagram.
Fig. 4 is an intelligent switch operating principle block diagram.
Fig. 5 is the structural representation of variable-frequency speed-regulating local fan.
Fig. 6 is an intelligent switch appearance structure schematic diagram.
Fig. 7 is the structural representation of intelligent switch.
Fig. 8 is the structural representation of flow channel type frequency converter.
Fig. 9 is the left TV structure schematic diagram of Fig. 7.
Among the figure: 1-current collector, 2-premuffler, 3-flow channel type frequency converter, 4-is to revolving the one-level blower fan, 5-is to revolving the secondary blower fan, 6-rear muffler, 7-man-machine dialog interface, 8-intrinsic safety I/O junction box, the 9-communication module, 10-programmable logic controller (PLC) PLC, 11-intelligent switch housing, 12-intelligent switch junction box, the cable introducing device of 13-intelligent switch, 14-Switch main body, 15-intelligent switch operating grip, the 16-transducer body, 17-frequency converter air duct, 18-frequency converter junction box, 19-supports coupling arrangement, the 20-maneuver box, 21-wire barrel device.
The specific embodiment
That the invention will be further described is as follows below in conjunction with embodiment:
Embodiment 1, and the present invention is made of frequency conversion booster, intelligent switch, sensor or underground signal monitoring system, and intelligent switch is provided with audible-visual annunciator and demonstration, control panel, and various sensors link with intelligent switch respectively; Various sensors are monitored gas density, temperature, wind speed, dust respectively, intelligent switch adopts programmable logic controller (PLC) PLC, and the signal data of sensor or the collection of underground signal monitoring system sends programmable logic controller (PLC) PLC to by intrinsic safety I/O junction box and carries out analyzing and processing.Described intrinsic safety I/O junction box is made of non-intrinsic safety wiring terminal and intrinsic safety wiring terminal more than 2 pairs, adopt photoelectric isolating circuit to link between the every pair of non-intrinsic safety wiring terminal and the intrinsic safety wiring terminal, described photoelectric isolating circuit is the circuit that is made of photoelectrical coupler, diode, electric capacity and resistance etc.Described intelligent switch is made of intelligent switch housing 11, intelligent switch junction box 12 and Switch main body 14, and intelligent switch junction box 12 is installed on the intelligent switch housing 11, and intelligent switch junction box 12 is provided with cable introducing device 13; Switch main body 14 is installed in the intelligent switch housing 11, Switch main body 14 is provided with communication module 9 and programmable logic controller (PLC) PLC10, intelligent switch operating grip 15 and man-machine dialog interface 7 are installed on the intelligent switch housing 11, and link with Switch main body 14, man-machine dialog interface 7 links by circuit and programmable logic controller (PLC) PLC10.Programmable logic controller (PLC) PLC can adopt the S7-200 type programmable logic controller (PLC) of Siemens Company as core component, carries out collection, analysis and the processing of signal; Adopt the text display of Siemens Company to carry out human-computer dialogue; Select for use vacuum contactor to improve reliability to high-power control device contactor; Adopt S7-200 type programmable logic controller (PLC) PLC to have 2 RS-485 communication interfaces, one can be used for frequency converter is controlled, i.e. the control of internal system, and another is used to connect interactive text display; Various sensing datas comprise the intrinsic safety I/O junction box of fire damp outstation data by programmable logic controller (PLC) PLC and send programmable logic controller (PLC) PLC to and carry out integrated treatment.The microcomputerized control technology is adopted in the main control of converter plant, thereby can improve the functional reliability of frequency conversion system.Consult Fig. 1 to Fig. 9.
Operating principle of the present invention is: the power frequency three-phase alternating-current supply is after the input cable is incorporated into the frequency conversion special switch; through behind isolating switch → vacuum contactor → electronics synthesis protective device; output to and be sent to AC reactor → rectification module → behind the input → power-supply filter of this input power supply in being installed in frequency converter that is placed in frequency converter in the frequency conversion fan through the rectification module rectification; after alternating current is transformed into direct current → this dc source is fed to IGBT inversion module → after this module is reverse into the AC power of frequency adjustable with dc source; supply with the one-level of blower fan simultaneously; the secondary motor is realized the fan intelligent air feed.
The electronics synthesis protection explanation of main system and back-up system: the power frequency three-phase alternating-current supply is incorporated into the master through the input cable; after being equipped with the input terminal of frequency conversion special switch; to lead; the isolation reversing switch connection → master of power backup road special switch; the electronics synthesis protective device that is equipped with in the switch carries out detection of electrical leakage; when the loop of examining does not have electric leakage; programmable logic controller (PLC) PLC in the frequency conversion special intelligent switch in main system of 3 and 4 closings of contact of electronics synthesis protective device → meanwhile and the back-up system gets; and with the joining gas of intelligent switch; temperature; sensors such as dust get electric and work → its signal and output among the programmable logic controller (PLC) PLC in the frequency conversion special intelligent switch in main system and the back-up system, compare in PLC.After normal, the Q0:0 output point closure of PLC.The auxiliary reclay of the intelligent switch in the main system get electric and constant open contact closed; be the startup of the main switch main transformer starting button in the switch frequently of preparing → press; the vacuum contactor main contacts closure of the intelligent switch in the main system; the power frequency three-phase alternating-current supply through the electronics synthesis protective device be sent to be placed in main transformer frequently in the blower fan input → this input power supply of frequency converter after frequency converter startup work; become frequency adjustable ground three-phase alternating-current supply and supply with one-level, the secondary motor rotation of main air blower simultaneously, to realize the intelligent air feed of this blower fan.
The explanation of main system and back-up system short range, Long-distance Control: in the booster working site, installation is provided with sensors such as dust, temperature and gas, and sensor compares the programmable logic controller (PLC) PLC that detected parameter in the site work environment is sent in the intelligent switch in the main system.If detected parameter value meets the requirement of setting normal value among the programmable logic controller (PLC) PLC, then the instruction of the previous given frequency converter of programmable logic controller (PLC) PLC remains unchanged.The rotating speed of frequency conversion fan remains unchanged.If programmable logic controller (PLC) PLC relatively after, detected parameter value is bigger than normal value, then programmable logic controller (PLC) PLC sends instruction by the RS485 port to the control centre of frequency converter, change output frequency, increase rotation speed of fan, impel dust, temperature or gas parameter in the working environment to drop to just often and end.Meanwhile the environmental aspect of working site is also delivered on the display screen by the RS485 port of programmable logic controller (PLC) PLC in the lump and is shown.In the intelligent switch system in main system, the communication module that programmable logic controller (PLC) PLC adds and the Long-distance Control communication center of upper level instruct the control of transmitting.
When the intelligent switch in the main system can not be worked for some reason, the main contacts of its vacuum contactor disconnected, and auxiliary constant open contact disconnects, and the time relay dead electricity in the intelligent switch in the back-up system quits work, constant close contact timing closing.The constant open contact time-delay disconnects, and the main contacts in the intelligent switch in the back-up system gets electric work, the closed and self-locking of its main contacts.Intelligent switch in the back-up system enters duty; the electronics synthesis protective device of power frequency three-phase alternating current in this device be sent to be placed in frequency converter in the standby variable frequency blower fan input → this input power supply after frequency converter startup work; become frequency adjustable ground three-phase alternating-current supply and supply with one-level, the secondary motor rotation of standby fan simultaneously, realize the intelligent air feed of this blower fan.
In like manner, the dust, temperature and the firedamp sensor that are installed in the working site compare the programmable logic controller (PLC) PLC that detected parameter in the site work environment is sent in the intelligent switch in the back-up system, detected parameter value then keeps the rotating speed of standby variable frequency blower fan constant if satisfy the normal value requirement of setting among the programmable logic controller (PLC) PLC.If relatively, detected parameter value is bigger than normal value, then programmable logic controller (PLC) PLC sends instruction by the RS485 port to the control centre of standby variable frequency device, change output frequency, increase rotation speed of fan, impel dust, temperature or gas parameter in the working environment to drop to just often and end.Meanwhile the environmental aspect of working site is also delivered on the display screen by the RS485 port of programmable logic controller (PLC) PLC in the lump and is shown.In the intelligent switch system in back-up system, the communication module that programmable logic controller (PLC) PLC adds also can be instructed the control of transmission with the Long-distance Control communication center of upper level.
Claims (6)
1, a kind of intelligent local ventilation system, it is characterized in that: it is made of frequency conversion booster, intelligent switch, sensor or underground signal monitoring system, intelligent switch is provided with audible-visual annunciator and demonstration, control panel, comprises that gas, wind speed, temperature pick up link with intelligent switch respectively; Intelligent switch adopts programmable logic controller (PLC) PLC, and the signal data of sensor or the collection of underground signal monitoring system sends programmable logic controller (PLC) PLC to by intrinsic safety I/O junction box and carries out analyzing and processing.
2, intelligent local ventilation system according to claim 1, it is characterized in that: described intrinsic safety I/O junction box is made of non-intrinsic safety wiring terminal and intrinsic safety wiring terminal more than 2 pairs, adopt photoelectric isolating circuit to link between the every pair of non-intrinsic safety wiring terminal and the intrinsic safety wiring terminal, described photoelectric isolating circuit is by the circuit that comprises that photoelectrical coupler, diode, electric capacity and resistance constitute.
3, intelligent local ventilation system according to claim 1, it is characterized in that: it constitutes main system by frequency conversion booster, intelligent switch respectively and back-up system, 2 systems install side by side, and the communication interface of the intelligent switch of main system and 2 systems of back-up system is coupled to each other.
4, intelligent local ventilation system according to claim 1, it is characterized in that: described frequency conversion booster adopts two counter-rotating fans, it is by current collector (1), premuffler (2), flow channel type frequency converter (3), to revolving one-level blower fan (4), connecting successively and form revolving secondary blower fan (5) and rear muffler (6), described flow channel type frequency converter (3) with on same axis, link or make an integral body revolving one-level blower fan (4), and flow channel type frequency converter (3) respectively with to revolving one-level blower fan (4) and the circuit that revolves secondary blower fan (5) being linked.
5, intelligent local ventilation system according to claim 4, it is characterized in that: described flow channel type frequency converter (3) is to be connected by 2 half housings to form the outer columned transducer body (16) that forms that the flame proof cooperation connects firmly into closed at both ends, between the joint face of 2 half housings, be provided with flameproof joint, transducer body (16) is installed in the cross section central authorities of frequency converter air duct (17), be provided with between transducer body (16) and the frequency converter air duct (17) and support coupling arrangement (19), the wall of transducer body (16) is provided with the connection cable connection holes, frequency converter air duct (17) is provided with transducer body (16) and goes up the corresponding junction box connection holes in connection cable connection holes position that is provided with, and is installed in the outer frequency converter junction box (18) of frequency converter air duct (17) and the tie of maneuver box (20) and passes wire barrel device (21) respectively, junction box connection holes and connection cable connection holes link with the electric assembly that is installed in the transducer body (16).
6, intelligent local ventilation system according to claim 1, it is characterized in that: intelligent switch is made of intelligent switch housing (11), intelligent switch junction box (12) and Switch main body (14), intelligent switch junction box (12) is installed on the intelligent switch housing (11), and intelligent switch junction box (12) is provided with cable introducing device (13); Switch main body (14) is installed in the intelligent switch housing (11), Switch main body (14) is provided with communication module (9) and programmable logic controller (PLC) PLC (10), intelligent switch operating grip (15) and man-machine dialog interface (7) are installed on the intelligent switch housing (11), and link with Switch main body (14), man-machine dialog interface (7) links by circuit and programmable logic controller (PLC) PLC (10).
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| CNA2008101434642A CN101418695A (en) | 2008-10-31 | 2008-10-31 | Intelligent local ventilation system |
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| CNA2008101434642A CN101418695A (en) | 2008-10-31 | 2008-10-31 | Intelligent local ventilation system |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425442A (en) * | 2011-11-10 | 2012-04-25 | 辽宁工程技术大学 | Variable-frequency regulation ventilation system and method for coal mining area |
| CN102704979A (en) * | 2012-05-29 | 2012-10-03 | 孟志强 | Intelligent ventilation management system for coal mine |
| CN102704981A (en) * | 2012-06-21 | 2012-10-03 | 中国矿业大学 | Self-adaptive intelligent control system for ventilator |
| CN102889091A (en) * | 2011-07-22 | 2013-01-23 | 郝景华 | Tunnel turning frequency-variable ventilating method |
| CN104295311A (en) * | 2014-08-20 | 2015-01-21 | 四川天微电子有限责任公司 | Coal mine explosion protection system capable of allowing control points to be conveniently switched |
| CN104295312A (en) * | 2014-08-20 | 2015-01-21 | 四川天微电子有限责任公司 | Coal mine explosion protection system |
| CN104329108A (en) * | 2014-09-09 | 2015-02-04 | 辽宁工程技术大学 | Mine multi-workface air pressure integral dynamic balance control system and control method |
| CN104632281A (en) * | 2014-12-23 | 2015-05-20 | 常熟市矿山机电器材有限公司 | Coal mine dust monitoring system based on PLC |
| CN105545360A (en) * | 2015-12-08 | 2016-05-04 | 太仓市新志杰电子科技有限公司 | Underground mine air quality display LED system |
| CN102373941B (en) * | 2011-11-22 | 2016-12-14 | 平安电气股份有限公司 | Mining dual-power dual-fan ventilation system |
| CN107083982A (en) * | 2017-03-24 | 2017-08-22 | 中国恩菲工程技术有限公司 | Analyze quo of local Fan for Mine and analysis mining partial ventilating system |
| CN111520175A (en) * | 2020-06-15 | 2020-08-11 | 平安电气股份有限公司 | Switching device for main ventilator and standby ventilator of mine |
| CN112211662A (en) * | 2020-09-27 | 2021-01-12 | 安徽铜冠智能科技有限责任公司 | Intelligent ventilation system for mine mining field |
| CN114151122A (en) * | 2021-11-26 | 2022-03-08 | 西安重装韩城煤矿机械有限公司 | Mining intelligent local ventilation system |
| CN115703116A (en) * | 2021-08-10 | 2023-02-17 | 唐山新海纳自动化有限公司 | Deep maintenance process for prolonging service life of frequency converter |
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2008
- 2008-10-31 CN CNA2008101434642A patent/CN101418695A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889091A (en) * | 2011-07-22 | 2013-01-23 | 郝景华 | Tunnel turning frequency-variable ventilating method |
| CN102425442A (en) * | 2011-11-10 | 2012-04-25 | 辽宁工程技术大学 | Variable-frequency regulation ventilation system and method for coal mining area |
| CN102373941B (en) * | 2011-11-22 | 2016-12-14 | 平安电气股份有限公司 | Mining dual-power dual-fan ventilation system |
| CN102704979B (en) * | 2012-05-29 | 2015-03-18 | 河北工程大学 | Intelligent ventilation management system for coal mine |
| CN102704979A (en) * | 2012-05-29 | 2012-10-03 | 孟志强 | Intelligent ventilation management system for coal mine |
| CN102704981B (en) * | 2012-06-21 | 2015-03-04 | 中国矿业大学 | Self-adaptive intelligent control system for ventilator |
| CN102704981A (en) * | 2012-06-21 | 2012-10-03 | 中国矿业大学 | Self-adaptive intelligent control system for ventilator |
| CN104295312A (en) * | 2014-08-20 | 2015-01-21 | 四川天微电子有限责任公司 | Coal mine explosion protection system |
| CN104295311A (en) * | 2014-08-20 | 2015-01-21 | 四川天微电子有限责任公司 | Coal mine explosion protection system capable of allowing control points to be conveniently switched |
| CN104329108A (en) * | 2014-09-09 | 2015-02-04 | 辽宁工程技术大学 | Mine multi-workface air pressure integral dynamic balance control system and control method |
| CN104329108B (en) * | 2014-09-09 | 2016-11-23 | 辽宁工程技术大学 | A kind of control method of mine Multi-working-surface blast overall dynamics balance control system |
| CN104632281A (en) * | 2014-12-23 | 2015-05-20 | 常熟市矿山机电器材有限公司 | Coal mine dust monitoring system based on PLC |
| CN105545360A (en) * | 2015-12-08 | 2016-05-04 | 太仓市新志杰电子科技有限公司 | Underground mine air quality display LED system |
| CN107083982A (en) * | 2017-03-24 | 2017-08-22 | 中国恩菲工程技术有限公司 | Analyze quo of local Fan for Mine and analysis mining partial ventilating system |
| CN111520175A (en) * | 2020-06-15 | 2020-08-11 | 平安电气股份有限公司 | Switching device for main ventilator and standby ventilator of mine |
| CN112211662A (en) * | 2020-09-27 | 2021-01-12 | 安徽铜冠智能科技有限责任公司 | Intelligent ventilation system for mine mining field |
| CN115703116A (en) * | 2021-08-10 | 2023-02-17 | 唐山新海纳自动化有限公司 | Deep maintenance process for prolonging service life of frequency converter |
| CN114151122A (en) * | 2021-11-26 | 2022-03-08 | 西安重装韩城煤矿机械有限公司 | Mining intelligent local ventilation system |
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Open date: 20090429 |