CN204297588U - A kind of colliery Belt transport monitored control system - Google Patents
A kind of colliery Belt transport monitored control system Download PDFInfo
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- CN204297588U CN204297588U CN201420748421.8U CN201420748421U CN204297588U CN 204297588 U CN204297588 U CN 204297588U CN 201420748421 U CN201420748421 U CN 201420748421U CN 204297588 U CN204297588 U CN 204297588U
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Abstract
The utility model relates to a kind of colliery Belt transport monitored control system, comprise ground central station and downhole monitoring equipment, ground central station comprises monitoring host computer (1), reserve machine (2), ground ring exchanger (3), chopping machine (4), ups power (5) and lightning arrester (6), lightning arrester (6) connects ups power (5), monitoring host computer (1), the mutual redundancy of reserve machine (2) also connects ground ring exchanger (3), downhole monitoring equipment comprises mine explosion-suppression and intrinsic safety type PLC (7), Mine-used I. S operating console (8), Mine-used I. S acousto-optic signal, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case (9), part of data acquisition (10) and intelligent control part (11), mine explosion-suppression and intrinsic safety type PLC (7) connects ground ring exchanger (3), the utility model not only structure is simple, easy for installation, and is easy to operation and arranges, and safety and reliability is higher.
Description
[technical field]
The utility model relates to monitored control system technical field, specifically a kind of colliery Belt transport monitored control system.
[background technology]
In recent years, along with the development of colliery cause, modern mine construction has become the inexorable trend of following construction of coal mine, and especially in shaft production, coal is from coal mining one line to coal ground set-point, and sealing-tape machine transports important in inhibiting in shaft production.At present, high spud angle, long haul distance, high-power sealing-tape machine generally use especially.In order to accelerate further mine automation, mechanization, digitalisation, the information-based paces developed with energy-saving, particularly guarantee belt conveyor system reliable running, the operating mode of belt conveyor system can be understood in time.Therefore, if the colliery Belt transport monitored control system that a kind of safety and reliability can be provided higher, to adapt to above-mentioned particular surroundings, will have very important significance.
[utility model content]
The purpose of this utility model be exactly to solve above-mentioned deficiency and provide a kind of be suitable for improving belt conveyor system reliability service, in real time to the monitoring of sealing-tape machine operating condition, can the colliery Belt transport monitored control system of local and remote control sealing-tape machine equipment start-stop, not only structure is simple, easy for installation, and be easy to operation and arrange, safety and reliability is higher.
Design a kind of colliery Belt transport monitored control system for achieving the above object, comprise ground central station and downhole monitoring equipment, described ground central station comprises monitoring host computer 1, reserve machine 2, ground ring exchanger 3, chopping machine 4, ups power 5 and lightning arrester 6, described lightning arrester 6 passes through connection ups power 5, described monitoring host computer 1, reserve machine 2, ground ring exchanger 3, chopping machine 4 is powered by ups power 5, described monitoring host computer 1, redundancy is also by connection ground ring exchanger 3 mutually for reserve machine 2, and described downhole monitoring equipment comprises mine explosion-suppression and intrinsic safety type PLC 7, Mine-used I. S operating console 8, Mine-used I. S acousto-optic signal, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case 9, part of data acquisition 10 and intelligent control part 11, described mine explosion-suppression and intrinsic safety type PLC 7 connects ground ring exchanger 3 by ferry optics comunication, described Mine-used I. S operating console 8, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case 9, part of data acquisition 10, intelligent control part 11 is respectively by connection mine explosion-suppression and intrinsic safety type PLC 7.
Described part of data acquisition 10 comprises speed sensor 18, heap coal sensor 12, temperature sensor 19, Smoke Sensor 15, tears sensor 14, misalignment sensor 13, tension pick-up 16 and anxious stop sensor 17, described speed sensor 18, heap coal sensor 12, temperature sensor 19, Smoke Sensor 15, tears sensor 14, misalignment sensor 13, tension pick-up 16 and anxious stop sensor 17 respectively by connection mine explosion-suppression and intrinsic safety type PLC 7.
Described intelligent control part 11 comprises motor 1, motor 2 21, tension motor 22 and explosion-proof type magnetic valve 23, and described motor 1, motor 2 21, tension motor 22 and explosion-proof type magnetic valve 23 are respectively by connection mine explosion-suppression and intrinsic safety type PLC 7.
Guard grating in described Mine-used I. S acousto-optic signal connecting mine Flameproof and intrinsically safe PLC 7, the non-peace side communication connection man-machine interface of described guard grating.
The front console of described mine explosion-suppression and intrinsic safety type PLC 7 is provided with observation window, arrow button and function button, described arrow button comprises direction, upper and lower, left and right knob, described function button comprises cancellation, determines function knob, in described mine explosion-suppression and intrinsic safety type PLC 7, Ethernet switch is installed, in described mine explosion-suppression and intrinsic safety type PLC 7, is provided with communication interface.
Described chopping machine 4 is connected on computer, described monitoring host computer 1, reserve machine 2 are connected to ground ring exchanger 3 in the mode of ethernet, and the fiber port of described ground ring exchanger 3 is connected to the exchange fiber port in the mine explosion-suppression and intrinsic safety type PLC 7 of down-hole by cable line.
Compared with the existing technology, tool has the following advantages the utility model:
(1) industrial computer that stability is high, performance is high is adopted, and monitoring software stable on industrial computer, friendly user interface, is easy to operation and the setting of user;
(2) mine explosion-suppression and intrinsic safety type PLC, is built-in with the man-machine interface adopting 32-bit microprocessor, friendly user interface, is easy to operation and arranges;
(3) kernel control chip " Programmable Logic Controller " is imported with original packaging, stable and reliable for performance, quality is superior;
(4) international advanced quartz conductor full-shield isolation technology is adopted;
(5) unique sealing-tape machine fault self-diagnosis function, each fault type of identifiable design and position of fault;
(6) ups power has independently bypass and bypass protector;
(7) there is the RS485 of standard, ethernet communication port, can direct construction system, carry out remote information exchange and control;
(8) there is the external switch amount of essential safe type, analog signals input port, by Signal transmissions such as outside coal piling, temperature, speed, tension force to Programmable Logic Controller, data acquisition function can be realized.
[accompanying drawing explanation]
Fig. 1 is connection block diagram of the present utility model;
In figure: 1, monitoring host computer 2, reserve machine 3, ground ring exchanger 4, chopping machine 5, ups power 6, lightning arrester 7, mine explosion-suppression and intrinsic safety type PLC 8, Mine-used I. S operating console 9, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case 10, part of data acquisition 11, intelligent control part 12, heap coal sensor 13, misalignment sensor 14, tear sensor 15, Smoke Sensor 16, tension pick-up 17, anxious stop sensor 18, speed sensor 19, temperature sensor 20, motor 1, motor 2 22, tension motor 23, explosion-proof type magnetic valve.
[detailed description of the invention]
Below in conjunction with accompanying drawing, following further illustrating is done to the utility model:
As shown in Figure 1, the utility model comprises: ground central station and downhole monitoring equipment; Ground central station comprises monitoring host computer 1, reserve machine 2, ground ring exchanger 3, chopping machine 4, ups power 5 and lightning arrester 6, lightning arrester 6 is by connection ups power 5, monitoring host computer 1, reserve machine 2, ground ring exchanger 3, chopping machine 4 are powered by ups power 5, monitoring host computer 1, reserve machine 2 mutually redundancy also pass through connection ground ring exchanger 3, when when the supervisory control system running of main frame 1 is abnormal, reserve machine 2 can automatically switch into main frame and run, to ensure the normal operation of monitored control system; Downhole monitoring equipment comprises mine explosion-suppression and intrinsic safety type PLC 7, Mine-used I. S operating console 8, Mine-used I. S acousto-optic signal, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case 9, part of data acquisition 10 and intelligent control part 11, mine explosion-suppression and intrinsic safety type PLC 7 connects ground ring exchanger 3 by ferry optics comunication, and Mine-used I. S operating console 8, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case 9, part of data acquisition 10, intelligent control part 11 are respectively by connection mine explosion-suppression and intrinsic safety type PLC 7.
In the utility model, part of data acquisition 10 comprises speed sensor 18, heap coal sensor 12, temperature sensor 19, Smoke Sensor 15, tears sensor 14, misalignment sensor 13, tension pick-up 16 and anxious stop sensor 17, speed sensor 18, heap coal sensor 12, temperature sensor 19, Smoke Sensor 15, tears sensor 14, misalignment sensor 13, tension pick-up 16 and anxious stop sensor 17 respectively by connection mine explosion-suppression and intrinsic safety type PLC 7.Intelligent control part 11 comprises motor 1, motor 2 21, tension motor 22 and explosion-proof type magnetic valve 23, and motor 1, motor 2 21, tension motor 22 and explosion-proof type magnetic valve 23 are respectively by connection mine explosion-suppression and intrinsic safety type PLC 7.Guard grating in Mine-used I. S acousto-optic signal connecting mine Flameproof and intrinsically safe PLC 7, the non-peace side communication connection man-machine interface of guard grating, this Mine-used I. S acousto-optic signal can report out concrete sound fault, the service personnel very first time can be allowed to know concrete fault, improve treatment effeciency.The front console of mine explosion-suppression and intrinsic safety type PLC 7 is provided with observation window, arrow button and function button, arrow button comprises direction, upper and lower, left and right knob, function button comprises cancellation, determines function knob, the running condition of man-machine interface can be understood by observation window, direction knob binding function knob, the parameter modification of man-machine interface can be realized, control the start and stop of sealing-tape machine equipment.In mine explosion-suppression and intrinsic safety type PLC, Ethernet switch is installed, for the ethernet communication realized and between miscellaneous equipment, in mine explosion-suppression and intrinsic safety type PLC 7, Ethernet switch is installed, being provided with communication interface in mine explosion-suppression and intrinsic safety type PLC 7, communicating with the RS485 between miscellaneous equipment for realizing.Chopping machine 4 is connected on computer, monitoring host computer 1, reserve machine 2 are connected to ground ring exchanger 3 in the mode of ethernet, and the fiber port of ground ring exchanger 3 is connected to the exchange fiber port in the mine explosion-suppression and intrinsic safety type PLC 7 of down-hole by cable line.
In the utility model, ground monitoring central sation has computing machine, ups power, power arrester, KJJ12 Mine-used I. S ring exchanger, chopping machine.Underground equipment mainly contains KXJ127 mine explosion-suppression and intrinsic safety type PLC, TH24 Mine-used I. S operating console, KXH18 Mine-used I. S acousto-optic signal, GSG6 mining intrinsic safety type speed sensor, heap coal sensor that GUJ30 is mining, GWH400 essential safe type infrared temperature sensor, GQQ0.1 (D) mining intrinsic safety type Smoke Sensor, GVD28 intrinsic safety type longitudinal rupture of adhesive tape sensor, GEJ30 mining intrinsic safety type misalignment sensor, GAD100 tension pick-up, the two-way emergency stop switch sensor of KHJ10/18 (D) Mine-used I. S, KDW0.15/660 mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case, the compositions such as DFB-20-127 explosion-proof type magnetic valve for mine.
Ground central station has two industrial computers, and is provided with the monitored control system of mutual redundancy, and when the monitored control system of main frame occurs abnormal, standby host takes over the work of main frame automatically, ensures the normal operation of monitored control system.External power supply AC220V accesses ups power after accessing lightning arrester, provides power supply to two industrial computers, chopping machine, ground ring exchanger.Chopping machine is connected on a computer.Two industrial computers are connected to ground ring exchanger in the mode of ethernet.Two mutual redundancies of industrial computer, when the supervisory control system running of main frame is abnormal, standby host can automatically switch into main frame and run, and ensures the normal operation of monitored control system.
The fiber port of ground ring exchanger is connected to the exchange fiber port in the mine explosion-suppression and intrinsic safety type PLC of down-hole by cable line.Man-machine interface in mine explosion-suppression and intrinsic safety type PLC, Programmable Logic Controller are connected to its exchange in ethernet mode respectively.Mine-used I. S acousto-optic signal is connected to the RS485 communication security grid of mine explosion-suppression and intrinsic safety type PLC inside, and RS485 communication security grid communicate with man-machine interface.Intrinsic safety type analog sensor is connected to the analog quantity guard grating of mine explosion-suppression and intrinsic safety type PLC inside, and analog quantity guard grating outlet terminal is connected to Programmable Logic Controller.Intrinsic safety type Boolean value output sensor signal, directly accesses Programmable Logic Controller.
Mine-used I. S acousto-optic signal is linked into the RS485 guard grating in mine explosion-suppression and intrinsic safety type PLC by RS485 mode, the non-peace side of RS485 guard grating communicates with man-machine interface.Mine-used I. S operating console On-off signal directly accesses Programmable Logic Controller, and the relay switching variable contact of the indicator lamp connecting mine Flameproof and intrinsically safe PLC of Mine-used I. S operating console, its relay is controlled by the output of Programmable Logic Controller.Intrinsic safety type analog sensor is linked into the analog quantity guard grating of mine explosion-suppression and intrinsic safety type PLC, and the non-peace side of analog quantity guard grating is linked into Programmable Logic Controller.The PT100 temperature sensor of electric machine built-in directly accesses the analog input port of Programmable Logic Controller.
One, peripheral interface characteristic of the present utility model is:
(1) programmable digital input: controller has 40 road intrinsic safety without soruce contact type On-off signal, inputs corresponding conducting when being not more than 300 Ω, inputs corresponding cut-off when being not less than 90k Ω;
(2) programmable analog amount input: intrinsic safety 4 ~ 20mA analog input signal 10 tunnel, error: 0.5%, input impedance 500 Ω.Intrinsic safe resistor inputs 6 tunnels, inputs 100 Ω ~ 175.86 Ω, and corresponding 0 DEG C ~ 200 DEG C, error is not more than: 2.0%FS (resistance);
(3) relay exports: controller has 26 Lu Feian relay tips and exports: contact rating AC127/1A (resistive load), and contact resistance is not more than 0.5 Ω;
(4) coffret: half-duplex RS 485, bipolarity.
Two, technical performance characteristic of the present utility model is:
(1) analog input transmission process error is not more than 1.0%.
(2) the maximum polling period of system should be not more than 30s.
(3) the system remote control execution time is not more than 30s, and the control execution time is not more than 2s on the spot.
(4) response time recalling entire picture 85% should be not more than 2s, and all the other pictures should be not more than 5s.
(5) bit error ratio bit error ratio should be not more than 10
-8.
(6) drop into normal work from working host fault to backup host and should be not more than 5min.
(7) system should preserve more than 1 year to analog quantity statistical value record, inquiry accounting logging of reporting to the police, operating record inquiry accounting logging.When system jam, the time span of losing above-mentioned information should be not more than 5min.
Three, functional characteristic of the present utility model is:
(1) the alert function of perfect voice broadcast: concrete sound fault can be reported out, the service personnel very first time can be allowed to know concrete fault, improve treatment effeciency.
(2) data acquisition function: system has the analog acquisition functions such as tape speed, bowl temperature, conveyor belt tension, motor stator temperature, motor bearings temperature.
(3) addressing function is possessed: the particular location that can show the faults such as sealing-tape machine sideslip, along the line stay cord suddenly stop.
(4) data communication function: be provided with Ethernet switch in mine explosion-suppression and intrinsic safety type PLC, for the ethernet communication realized and between miscellaneous equipment.There is RS485 communication port in mine explosion-suppression and intrinsic safety type PLC, communicating with the RS485 between miscellaneous equipment for realizing.
Four, about the connection of power circuit of the present utility model and control circuit:
(1) connection of power circuit: for ground central station part, after power supply AC 220V accesses lightning arrester, access ups power.Two industrial computers, chopping machine, ground ring exchanger electricity consumption power supplys take from ups power.For downhole monitoring environment division, power supply AC127V accesses mine explosion-suppression and intrinsic safety type PLC and mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case.
(2) connection of control circuit: shielded multiconductor cable or twisted pair line connection control terminal need be used, during use shielded cable, (near mine explosion-suppression and intrinsic safety type PLC one end) should be connected to the earth terminal of mine explosion-suppression and intrinsic safety type PLC, during wiring, control cables (should comprise power lead away from power circuit and forceful electric power circuit, motor lines, relay, contactless switch line etc.) more than 20cm, avoid parallel cabling, suggestion adopts vertical wirings, causes RHVC misoperation to prevent external disturbance.
Five, about the operation of man-machine interface in the utility model:
The door closure of mine explosion-suppression and intrinsic safety type PLC is provided with " upper and lower, left and right " four personal-machine interface arrow button, " cancel, confirm " two personal-machine interface function knobs.Press corresponding direction knob, mobile man-machine interface mouse is to corresponding region, and binding function knob, can revise the parameter of man-machine interface, in conjunction with Programmable Logic Controller, can control the start and stop of sealing-tape machine equipment.
Constructional feature of the present utility model is: system is divided into ground central station part and downhole monitoring environment division.Ground central station part mainly contains two industrial computers (being provided with mutual redundancy monitor system software), chopping machine, ups power, lightning arrester, and downhole monitoring environment division mainly contains mine explosion-suppression and intrinsic safety type PLC, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case, Mine-used I. S acousto-optic signal.
Gordian technique of the present utility model is mine explosion-suppression and intrinsic safety type PLC.Be built-in with Programmable Logic Controller stable and reliable for performance, and international advanced quartz conductor full-shield isolation technology.This product design size can be 875*637*1000, and structural shape is bolt fastening structure, and spiral cable entry is indirectly introduce, and has one to be set to square observation window.
Claims (6)
1. a colliery Belt transport monitored control system, is characterized in that: comprise ground central station and downhole monitoring equipment, and described ground central station comprises monitoring host computer (1), reserve machine (2), ground ring exchanger (3), chopping machine (4), ups power (5) and lightning arrester (6), described lightning arrester (6) by connection ups power (5), described monitoring host computer (1), reserve machine (2), ground ring exchanger (3), chopping machine (4) is powered by ups power (5), described monitoring host computer (1), redundancy is also by connection ground ring exchanger (3) mutually for reserve machine (2), and described downhole monitoring equipment comprises mine explosion-suppression and intrinsic safety type PLC (7), Mine-used I. S operating console (8), Mine-used I. S acousto-optic signal, mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case (9), part of data acquisition (10) and intelligent control part (11), described mine explosion-suppression and intrinsic safety type PLC (7) connects ground ring exchanger (3) by ferry optics comunication, described Mine-used I. S operating console (8), mine flameproof and intrinsic safety type uninterrupted power supply (UPS) case (9), part of data acquisition (10), intelligent control part (11) is respectively by connection mine explosion-suppression and intrinsic safety type PLC (7).
2. colliery as claimed in claim 1 Belt transport monitored control system, it is characterized in that: described part of data acquisition (10) comprises speed sensor (18), heap coal sensor (12), temperature sensor (19), Smoke Sensor (15), tear sensor (14), misalignment sensor (13), tension pick-up (16) and anxious stop sensor (17), described speed sensor (18), heap coal sensor (12), temperature sensor (19), Smoke Sensor (15), tear sensor (14), misalignment sensor (13), tension pick-up (16) and anxious stop sensor (17) are respectively by connection mine explosion-suppression and intrinsic safety type PLC (7).
3. colliery as claimed in claim 1 or 2 Belt transport monitored control system, it is characterized in that: described intelligent control part (11) comprises motor one (20), motor two (21), tension motor (22) and explosion-proof type magnetic valve (23), described motor one (20), motor two (21), tension motor (22) and explosion-proof type magnetic valve (23) are respectively by connection mine explosion-suppression and intrinsic safety type PLC (7).
4. colliery as claimed in claim 3 Belt transport monitored control system, it is characterized in that: the guard grating in described Mine-used I. S acousto-optic signal connecting mine Flameproof and intrinsically safe PLC (7), the non-peace side communication connection man-machine interface of described guard grating.
5. colliery as claimed in claim 4 Belt transport monitored control system, it is characterized in that: the front console of described mine explosion-suppression and intrinsic safety type PLC (7) is provided with observation window, arrow button and function button, described arrow button comprises direction, upper and lower, left and right knob, described function button comprises cancellation, determines function knob, in described mine explosion-suppression and intrinsic safety type PLC (7), Ethernet switch is installed, in described mine explosion-suppression and intrinsic safety type PLC (7), is provided with communication interface.
6. colliery as claimed in claim 5 Belt transport monitored control system, it is characterized in that: described chopping machine (4) is connected on computer, described monitoring host computer (1), reserve machine (2) are connected to ground ring exchanger (3) in the mode of ethernet, and the fiber port on described ground ring exchanger (3) is connected to the exchange fiber port in the mine explosion-suppression and intrinsic safety type PLC (7) of down-hole by cable line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420748421.8U CN204297588U (en) | 2014-12-02 | 2014-12-02 | A kind of colliery Belt transport monitored control system |
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| CN201420748421.8U CN204297588U (en) | 2014-12-02 | 2014-12-02 | A kind of colliery Belt transport monitored control system |
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| CN204297588U true CN204297588U (en) | 2015-04-29 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105800278A (en) * | 2016-05-16 | 2016-07-27 | 中国矿业大学 | Fault diagnosis system and method of belt conveyor |
| CN106814651A (en) * | 2015-12-01 | 2017-06-09 | 衡阳双雁运输机械有限公司 | A kind of rubber conveyer with remote monitoring function |
| CN107187825A (en) * | 2017-07-14 | 2017-09-22 | 天津工业大学 | A kind of belt conveyor monitoring system based on Ethernet |
| CN109178830A (en) * | 2018-09-06 | 2019-01-11 | 徐州唐荣机械科技有限公司 | A kind of coal mine current failure emergency control System of Belt Conveyer |
| CN112158557A (en) * | 2020-08-05 | 2021-01-01 | 陕西天诚合创智能控制工程有限责任公司 | Novel flexible control of many belts speed matching in pit device |
| CN113003144A (en) * | 2021-02-26 | 2021-06-22 | 神华神东煤炭集团有限责任公司 | Control system of adhesive tape machine |
| CN114071259A (en) * | 2021-12-01 | 2022-02-18 | 鄂尔多斯市隆圣矿山机电股份有限公司 | Intelligent integrated dispatching control system for mining machine transportation |
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2014
- 2014-12-02 CN CN201420748421.8U patent/CN204297588U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814651A (en) * | 2015-12-01 | 2017-06-09 | 衡阳双雁运输机械有限公司 | A kind of rubber conveyer with remote monitoring function |
| CN105800278A (en) * | 2016-05-16 | 2016-07-27 | 中国矿业大学 | Fault diagnosis system and method of belt conveyor |
| WO2017197873A1 (en) * | 2016-05-16 | 2017-11-23 | 中国矿业大学 | System and method for diagnosing failure of belt-type conveyor |
| CN105800278B (en) * | 2016-05-16 | 2018-10-09 | 中国矿业大学 | A kind of fault diagnosis system and method for ribbon conveyer |
| CN107187825A (en) * | 2017-07-14 | 2017-09-22 | 天津工业大学 | A kind of belt conveyor monitoring system based on Ethernet |
| CN109178830A (en) * | 2018-09-06 | 2019-01-11 | 徐州唐荣机械科技有限公司 | A kind of coal mine current failure emergency control System of Belt Conveyer |
| CN112158557A (en) * | 2020-08-05 | 2021-01-01 | 陕西天诚合创智能控制工程有限责任公司 | Novel flexible control of many belts speed matching in pit device |
| CN113003144A (en) * | 2021-02-26 | 2021-06-22 | 神华神东煤炭集团有限责任公司 | Control system of adhesive tape machine |
| CN114071259A (en) * | 2021-12-01 | 2022-02-18 | 鄂尔多斯市隆圣矿山机电股份有限公司 | Intelligent integrated dispatching control system for mining machine transportation |
| WO2023098627A1 (en) * | 2021-12-01 | 2023-06-08 | 鄂尔多斯市隆圣矿山机电股份有限公司 | Intelligent integrated scheduling control system for mechanical mining transportation |
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