NB/T 11121-2023Digital construction of underground coal mine - Evaluation index and method (English PDF)

Foreword

This document was issued on 6 February 2023 by the National Energy Administration of the PRC and takes effect on 6 August 2023.

It is a NB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 73.040, Chinese classification D04.

This document is drafted in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.

This document was proposed by the China National Coal Association.

This document is under the jurisdiction of the Science and Technology Development Department of the China National Coal Association.

Drafting organizations of this document: Guoneng Information Technology Co., Ltd., China Energy Investment Corporation Limited, China Shenhua Energy Company Limited, and the Productivity Promotion Center of the China National Coal Association.

Principal drafters of this document: Pan Tao, Xu Huijun, Zhang Yansheng, Cao Haibin, Cui Liming, Kong Huayong, Zhao Han, Zheng Houfa, Ji Liuting, Yang Yang, Guo Wei, Wu Xiaohua, Zhang Jianhua, Xu Dexuan, Rao Tianrong and Li Huitong.

1 Scope

NB/T 11121-2023 sets out how the digitalisation of an underground coal mine is evaluated and graded. Chinese policy is pushing coal mines towards intelligent operation - automated faces, remote-controlled equipment, integrated monitoring and data-driven management - and this standard provides the common yardstick for judging how far a given mine has actually come. It is an evaluation method rather than a technical specification. The standard gives the scope, the normative references and the defined terms and abbreviations, then the grading scheme: a mine is scored out of one thousand points across five levels, and classed as a Grade I, II or III digital coal mine above set thresholds, or as not yet digital below the lowest. It sets out the basic requirements a mine must meet before it can be evaluated, then the evaluation content level by level - the infrastructure level with networks, data centres and positioning; the equipment level with the digitalisation of mining, tunnelling, hoisting, transport, ventilation, drainage and power supply; the systems level with monitoring, safety and production control platforms; the management level with planning, maintenance and business processes; and the decision support level with data integration and analytics. The evaluation procedure, the scoring rules and the report follow, with the annexes giving the detailed scoring tables for each level and the standards each requirement rests on.

This document specifies the evaluation indicators and evaluation method for the digital construction of underground coal mines, covering the classification of digital construction evaluation, the evaluation index system for digital construction and the evaluation method for digital construction.

This document is applicable to the evaluation of the digital construction of newly built, reconstructed (expanded) and producing underground coal mines.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

NB/T 11120-2023 Digital construction of underground coal mine - Technical requirements.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in NB/T 11120-2023 apply.

4 Classification of digital construction evaluation

Based on the category of construction conditions of the digital mine and the established graded evaluation index system for digital coal mines, the construction results of the digital mine are comprehensively evaluated, and the evaluation result of each category of digital mine is subdivided into three grades: Grade I digital coal mine, Grade II digital coal mine and Grade III digital coal mine, as shown in Table 1.

Table 1 Classification of evaluation grades of digital coal mines: No. 1 is the Grade I digital coal mine, No. 2 is the Grade II digital coal mine and No. 3 is the Grade III digital coal mine.

5 Evaluation index system for digital construction

5.1 Evaluation index system of the digital mine: in accordance with the requirements of NB/T 11120-2023, the evaluation index system and evaluation indicators shall be established on five layers, from the bottom to the top of the digital mine application architecture: the equipment layer, the production control layer, the production execution layer, the business management layer and the decision support layer. The evaluation index system of digital underground coal mines is given in Annex A.

5.2 Equipment layer: the indicators mainly cover hardware systems and software systems such as sensors, actuators, power supplies, industrial cameras and mobile terminals.

5.2 a) The equipment layer mainly realizes information identification and perception of the 'personnel, machines and environment' at the production site, fault self-diagnosis, data exchange for automatic control, and execution of commands from the upper layers.

5.2 b) At this layer, normative descriptions shall be given for the degree of intelligence, reliability, unique coding, location information, device interaction protocols and sensor network requirements of all objects, so as to achieve plug-and-play of sensing devices, data exchange and standardized transmission.

5.3 Production control layer: the indicators mainly cover the automation systems, the backbone network and the integrated automation platform.

5.3 a) The production control layer consists mainly of the automation systems, the backbone network and the integrated automation platform, including the underground backbone network, the surface network and the individual automation systems; it mainly realizes real-time monitoring and automatic and coordinated operation control of the 'personnel, machines and environment' at the production site, equipment fault diagnosis and disaster early warning.

5.3 b) At this layer, standardization requirements shall be put forward for network security and network resources; classification and coding standards shall be established for mine spatial information and metadata; data storage specifications, standardized protocol formats for data exchange, and description methods and criteria for metadata and structured information shall be put forward for different types of systems to meet data exchange needs between systems; and intelligent functional requirements shall be put forward for different types of systems to achieve disaster early warning and coordinated control of production processes, with the goal of unattended operation of key production processes.

5.4 Production execution layer: the indicators mainly cover information systems for production, dispatching, electromechanical, geological survey, ventilation and safety. The production execution layer mainly includes these information systems, the business management systems, the coordinated management and control platform and shared storage resources, supporting the daily safety and production management of each business department.

5.5 Business management layer: the indicators mainly cover the office system and the enterprise management system.

5.6 Decision support layer: the indicators mainly cover decision support provided through data mining and analysis for the intrinsic safety of the mine, cost reduction and efficiency improvement in production, lean management and disaster rescue.

5.6 a) The decision support layer mainly provides decision support through data mining and analysis for intrinsic mine safety, cost reduction and efficiency improvement, lean management and disaster rescue. It mainly includes storage resources and data service resources (which may be shared with the coordinated management and control layer) and the decision support software platform.

5.6 b) At this layer, according to the actual production and business management requirements of the coal mine user, rich specialized applications may be built on existing data, decision support software covering mine safety, production and management may be developed and deployed, and a knowledge base may be constructed.

6 Evaluation method for digital construction

6.1 Requirements for layer indicators of digital construction: the indicators of the five layers of digital construction are scored item by item as first-level, second-level and third-level indicators on a percentage basis, with corresponding weights set for each level of indicator according to its importance; the scores of the relevant evaluation content are calculated in accordance with the scoring criteria, and the maturity of the digital mine is obtained and evaluated by grade.

6.2.1 a) Basic condition: licences and certificates (mining licence, safety production licence, certificate of qualification in safety production knowledge and management capability of the mine manager, business licence) are complete and valid, and mining is carried out in accordance with the law.

6.2.1 b) Basic condition: the mine is in normal continuous production, with any continuous production shutdown not exceeding 3 months.

6.2.1 c) Basic condition: a sound responsibility system for digital construction has been established.

6.2.1 d) Basic condition: a digital mine management body has been set up and is staffed and equipped with the personnel and equipment needed for the work.

6.2.1 e) Basic condition: a digital mine responsibility system has been established, a system (measures) for standardized assessment, appraisal, rewards and penalties for the digital mine has been formulated and implemented, and self-inspection and assessment of digital mine standardization is carried out as required.

6.2.2 a) The full score of the digital mine assessment of an underground coal mine is 1 000 points, and scoring is carried out on a thousand-point scale.

6.2.2 b) Scoring is carried out according to the scoring tables of each part contained in the digital mine system of the underground coal mine.

6.2.2 c) The sum of the assessment score of each part multiplied by the weight of that part is the digital mine assessment score of the underground coal mine, calculated using Formula (1): M = Sum of (alpha i multiplied by Mi).

6.2.2 In Formula (1), M is the digital mine assessment score of the underground coal mine; Mi is the digital mine assessment score of each of the five parts, namely the equipment layer, production control layer, production execution layer, business management layer and decision support layer; alpha i is the weight of each of these five parts.

6.2.3 a) The digital underground coal mine is assessed by category and by grade: the category of the digital mine is assessed first and, once the category has been determined, the standardization grade of the digital mine is assessed.

6.2.3 b) The standardization grades of digital underground coal mines are Grade I, Grade II and Grade III. Grade I is the highest grade, and Grade III is the minimum standard that a digital coal mine shall reach.

6.2.3 c) A coal mine with a digital mine assessment score of 900 points or above is rated as a Grade I digital underground coal mine.

6.2.3 d) A coal mine with a digital mine assessment score of 750 points to 900 points is rated as a Grade II digital underground coal mine.

6.2.3 e) A coal mine with a digital mine assessment score of 600 points to 750 points is rated as a Grade III digital underground coal mine.

6.2.3 f) A coal mine with an assessment score of less than 600 points is not considered a digital mine.

6.2.3 g) The standardized assessment and grading of digital underground coal mines follows the procedure of enterprise self-evaluation and application, on-site assessment, public notice and supervision, and announcement and recognition.

6.2.4 a) Where acceptance is organized locally, the acceptance expert group is formed by the provincial energy authority; where acceptance is organized by a central enterprise, the expert group is formed by its headquarters. The selected experts shall cover all main coal mine disciplines; the group shall have no fewer than 7 members, more than half of whom shall be drawn from the national coal mine intelligentization expert database, with no more than 2 experts from the same organization (group), and the group leader shall be an expert from the national coal mine expert database. Experts shall be selected on the principle of avoidance of their own province (group) and shall sign an expert acceptance commitment letter.

6.2.4 b) The Digital Acceptance Report of the Underground Coal Mine shall include an overview of the coal mine, the digital construction and investment of each system, the evaluation of construction results and the acceptance opinions, and shall be signed by the experts for confirmation.

6.2.5 a) The scoring and evaluation table of digital underground coal mines is given in Annex B.

6.2.5 b) For the assessment scoring of the equipment layer, the equipment layer scoring table of digital underground coal mines is given in Annex C.

6.2.5 c) For the assessment scoring of the production control layer, the production control layer scoring table is given in Annex D.

6.2.5 d) For the assessment scoring of the production execution layer, the production execution layer scoring table is given in Annex E.

6.2.5 e) For the assessment scoring of the business management layer, the business management layer scoring table is given in Annex F.

6.2.5 f) For the assessment scoring of the decision support layer, the decision support layer scoring table is given in Annex G.

6.2.6 a) Graded management and control of digital construction shall be implemented to standardize conduct, control quality, raise equipment and management levels and strengthen training, putting digital construction standards into practice so that the coal mine reaches and maintains its digital construction standardization grade and safe production is ensured.

6.2.6 b) An annual digital construction plan, including a construction funding plan, shall be drawn up and broken down to the relevant departments for strict implementation and assessment.

6.2.6 c) A body responsible for digital construction work shall be established, and the digital mine work responsibilities of each unit, department and person shall be clearly defined.

6.2.6 d) Funding shall be guaranteed, and the conditions for digital construction shall be improved and perfected.

6.2.6 e) A sound technical management system for digital construction shall be put in place, work systems shall be improved and technical innovation carried out; work rules, operating procedures and safety technical measures shall be prepared as required, with complete approval procedures and thorough implementation.

6.2.6 f) Process control and on-site management of each production link shall be strengthened, and self-inspection of compliance with digital construction standardization shall be carried out regularly.

6.2.6 g) On the basis of the digital construction standard grade obtained, processes and technology, equipment and facilities and management measures shall be continuously improved in a purposeful and planned manner and employee safety behaviour shall be standardized, further improving safe production conditions so that the coal mine maintains and raises its level of digital construction standardization, and a long-term mechanism for digital construction standardization shall be established.

Annex A (informative) Evaluation index system of digital underground coal mines

Figure A.1 gives the evaluation index system of digital underground coal mines. At the first level the system is divided into five layers: the equipment layer, the production control layer, the production execution layer, the business management layer and the decision support layer.

Equipment layer: intelligent sensors, intelligent instruments, base stations, intelligent cameras, intelligent controllers and infrastructure.

Infrastructure: data center, automation network, information network, administrative communication, coal mine dispatching room and video conference room system.

Production control layer: basic functions, data integration, remote control, data analysis, intelligent linkage, intelligent alarm, and diagnosis and auxiliary decision-making.

Basic functions: data acquisition and analysis, GIS integration, large-screen interaction, trend curve generation, authority management, user management, log management and print management.

Data integration: fully mechanized mining, continuous mining, heading, main transport, auxiliary transport, coal preparation plant, loading station, power supply, water supply, ventilation, compressed air, heat exchange, safety monitoring, personnel positioning, drainage, fire-fighting and sprinkling, lamp room, hydrological monitoring, mine broadcasting, fire monitoring, sewage treatment and industrial television.

Remote control: main transport, power supply, drainage, water supply, ventilation, compressed air, mine broadcasting and personnel positioning.

Data analysis: shearer and support playback, shearer travel track, working face advance analysis, safety monitoring data analysis, hydrological monitoring data analysis and tube bundle monitoring data analysis.

Intelligent linkage: gas alarm linkage, sump water level over-limit linkage, equipment fault linkage, personnel over-number and overtime linkage, local ventilator power-off linkage and belt conveyor protection action linkage.

Intelligent alarm: graded alarm indication, zoned alarm indication, alarm indication by discipline and multi-system combined alarm.

Diagnosis and auxiliary decision-making: periodic roof weighting evaluation, shutdown and maintenance coordination, and auxiliary decision-making combined with real-time geological data.

Production execution layer: production execution system software platform, three-dimensional display, production management, dispatching management, electromechanical management, 'one ventilation and three preventions' management, safety management, coal quality management, auxiliary design, energy saving and environmental protection management, and comprehensive analysis.

Production execution system software platform: business functions and technical functions.

Three-dimensional display: mine three-dimensional scene display, three-dimensional geographic information display, three-dimensional geological survey query, emergency management display and integrated information display.

Production management: production succession planning, three-dimensional geographic information display, mining and heading management, rock pressure management, geological survey management and team building.

Dispatching management: dispatching reports, production information, daily management and emergency management.

Electromechanical management: equipment operation and maintenance, mining and heading system management, hoisting system management, transport system management, power supply system management, water supply and drainage system management, compressed air system management, communication system management, heating and sewage treatment system management, lightning protection management of buildings and facilities, working material management and energy consumption management.

'One ventilation and three preventions' management: ventilation management, gas prevention management, outburst prevention management, fire prevention management and dust prevention management.

Safety management: risk assessment and hazard source management, supervision and inspection with hidden hazard rectification, unsafe behaviour management, risk pre-control management, accident management, incident management, contractor safety qualification management and capital construction project management.

Coal quality management: coal quality prediction, coal quality planning, coal quality data and quality management of purchased coal.

Auxiliary design: mining and heading engineering design; ventilation, rock burst prevention, safety monitoring and heat hazard prevention design; electromechanical design; water supply and drainage design; compressed air design; underground transport design; surface production system design; and surface building, water supply and drainage and heating design.

Energy saving and environmental protection management: energy consumption management; monitoring of mine water, domestic sewage, flue gas and gangue discharge; subsidence area monitoring, engineering treatment and greening and reclamation management; and comprehensive utilization.

Comprehensive analysis: production analysis, water prevention and control analysis, recovery rate analysis, coal quality analysis, rock pressure analysis, goaf fire prevention analysis, mining and heading balance analysis, real-time loading analysis, tripping analysis, local ventilator analysis, gas drainage compliance analysis and ventilation analysis.

Business management layer: planning management, ERP (enterprise resource planning), SRM (supplier relationship management), CRM (customer relationship management), strategic resource management, construction cost management, regulation management, safety management, OA (office automation), audit management, science and technology management, energy saving and emission reduction management, archive management, knowledge management, comprehensive statistics, administrative and logistics management, Party and mass organization management and coal production supervision management.

Decision support layer: business performance management and enterprise decision support.

Business performance management: annual performance target setting, work plan management, performance data collection, daily performance monitoring, and performance evaluation and feedback.

Enterprise decision support: ETL (data extraction, transformation and loading), data warehouse metadata management, and data analysis and presentation.

Annex B (informative) Scoring and evaluation table of digital underground coal mines

Table B.1 gives the scoring and evaluation table of digital underground coal mines, listing for each layer the standard score, the weight (alpha i), the assessment score (Mi) and the weighted score, followed by the total assessment score and the assessment grade of the digital underground coal mine.

Standard scores in Table B.1: equipment layer 250 points, production control layer 300 points, production execution layer 250 points, business management layer 150 points and decision support layer 50 points, each with a weight of 1.00.

Annex C (informative) Equipment layer scoring table of digital underground coal mines

Table C.1 gives the equipment layer scoring table, with columns for first-level, second-level and third-level indicators, basic requirements, standard score, scoring method and score. For each indicator the scoring method is an on-site check of documents and systems, with 1 point deducted for each item that does not meet the requirements or is not organized and implemented according to the implementation plan.

Intelligent sensors (45 points), functional requirements: logic judgement and statistical processing; self-test, self-diagnosis and self-calibration; bidirectional communication and standardized digital output; human-machine dialogue; and computation, information storage and memory.

Intelligent sensors, equipment configuration requirements: for equipment monitoring, 100% coverage of operating status monitoring of mine equipment; accurate perception of accident and disaster precursor information during dynamic mining; and complete functions of the sensing nodes, routing nodes and cooperative nodes of the underlying equipment monitoring sensor network of the mine.

Intelligent instruments (40 points): the data acquisition, recording and analysis, real-time control, network monitoring and integrated management functions of the detecting instruments, display instruments, regulating (control) instruments and actuators of the equipment and facilities in use in the mine shall meet the equipment operation and environmental monitoring requirements, and equipment configuration shall meet the mine equipment operation and environmental monitoring requirements.

Base stations (40 points): the technical specifications of the selected products shall meet the requirements of mine equipment operation and safety production monitoring and control, and base station configuration shall meet the requirements of mine safety production and production succession.

Intelligent cameras (35 points): functions such as wireless AP hotspot, alarm, video stream push, private cloud service, mobile application, acquisition of environmental information from sensors and voice interaction shall meet the requirements of mine equipment operation and safety production monitoring and control; camera configuration shall meet the requirements of mine safety production and production succession.

Intelligent controllers (30 points): functions shall meet the operating requirements of the main mine equipment and of safety monitoring and control equipment, and controller configuration shall meet the requirements of main equipment operation and safety production monitoring and control.

Infrastructure, data center (10 points): construction content, including servers, operating systems, system software, storage, backup, infrastructure resource supply management and virtualized resource management, shall meet mine safety production requirements; the physical environment, including the machine room environment, power supply system, air conditioning and fresh air, security and centralized monitoring system, gas fire extinguishing works and machine room cabling, shall meet the relevant construction requirements.

Infrastructure, data center (continued): servers including database servers, application servers, WEB servers, domain control servers and database acquisition servers shall meet the construction requirements; storage, backup, virtualized resources and infrastructure resource supply management shall meet the construction requirements; and big data technology shall be used for storage.

Infrastructure, automation network (10 points): the automation control network uses industrial Ethernet technology combined with PON, GEPON and wireless transmission technology, with some automation subsystems using industrial fieldbus as the subsystem network. Bandwidth is based on the services and data flows carried, taking future expansion into account. The network consists of the surface control center, field substations, information transmission media and network communication interface equipment, and shall implement a unified user authentication platform meeting mine construction requirements.

Infrastructure, information network (10 points): the information network provides the transmission channel for enterprise management information systems centred on coal product sales, material procurement and inventory, financial management, production dispatching, safety management, access to the coal group center and Internet services. It mainly carries internal office and business management information and transmits video conference, VOIP video and voice multimedia data; its construction content includes switches, cabling, network management and network security.

Infrastructure, administrative communication (10 points): construction content includes IP telephone and softswitch communication equipment, the central distribution frame, floor distribution frames and telephone cabling, meeting the relevant construction requirements.

Infrastructure, coal mine dispatching room display system (10 points): display modes include LCD television, plasma splicing and DLP splicing; functions include zooming, roaming, overlay and enlarged display, with grouped switching of images, patrol and preset display.

Infrastructure, video conference room system (10 points): includes central control equipment (recording, video recording, mixing console), microphones, power amplifiers, speakers, cameras, display units and cabling; functions include point-to-point remote conferencing, simultaneous multi-group conferences, multi-picture conferencing, dual-stream conferencing, multiple conference modes, image polling, conference control, re-invitation of dropped terminals, full-channel mixing and muting, and a simplified Chinese interface.

Annex D (informative) Production control layer scoring table of digital underground coal mines

Table D.1 gives the production control layer scoring table. Its first-level indicators are the integrated production monitoring platform and the monitoring subsystems; unless otherwise stated, scoring is by on-site check of documents and systems, with 1 point deducted for each item not meeting the requirements or not implemented according to the implementation plan.

Integrated production monitoring platform, basic functions (10 points): data acquisition and analysis, GIS integration, large-screen interaction, trend curve generation, authority management, user management, log management and print management.

Integrated production monitoring platform, data integration (10 points): integration of subsystems for fully mechanized mining, continuous mining, main transport, auxiliary transport, coal preparation plant, loading station, power supply, drainage, water supply, ventilation, compressed air, heat exchange, safety monitoring, personnel positioning, industrial television, fire-fighting sprinkling, lamp room, hydrological monitoring, mine broadcasting, fire monitoring, sewage treatment and geographic information, with flow chart display, production information push and video display on mobile terminals.

Integrated production monitoring platform, remote control (10 points): remote control of subsystems such as main transport, power supply, drainage, water supply, compressed air, ventilation, mine broadcasting and personnel positioning.

Integrated production monitoring platform, data analysis (10 points): shearer and support playback, shearer travel track, working face advance analysis, safety monitoring data analysis, hydrological monitoring data analysis and tube bundle monitoring analysis.

Integrated production monitoring platform, intelligent linkage (10 points): gas alarm linkage, sump water level over-limit linkage, equipment fault linkage, personnel over-number and overtime linkage, local ventilator power-off linkage and belt protection action linkage; scoring also includes checking electronic records and instruments.

Integrated production monitoring platform, intelligent alarm (10 points): graded alarm indication, zoned alarm indication, alarm indication by discipline and multi-system combined alarm.

Integrated production monitoring platform, diagnosis and auxiliary decision-making (10 points): periodic roof weighting evaluation, shutdown and maintenance coordination, and auxiliary decision-making combined with real-time geological data.

Fully mechanized face monitoring system (15 points): covers the shearer (plough), hydraulic supports, scraper conveyor, stage loader, crusher, gateway belt conveyor, emulsion pump station and electrical equipment; reference standard MT/T 1127 General technical conditions for production monitoring systems of coal mine working faces.

Fully mechanized face monitoring system, basic requirements: automatic acquisition of equipment parameters; signal exchange between equipment for interlocked control; automatic shearer operation to preset parameters; automatic adjustment of haulage speed to load; automatic lowering, advancing and raising of hydraulic supports following the shearer, with face guard retraction and extension and spray dust suppression; crusher blockage detection and interlocking; face video and shearer-following video; and control from the gateway control console and remote control of coal cutting through sensors on the shearer and supports (currently requiring accurate coal-rock identification sensors and shearer drum and support position detection technology).

Heading face monitoring system (10 points): covers roadheaders, bolter miners, continuous miners, roof bolters, shuttle cars, coal haulers, continuous haulage equipment, heading belt conveyors, local ventilators, gas, dust, electrical equipment and drilling rigs; reference standard MT/T 1127.

Heading face monitoring system, basic requirements: automatic acquisition of equipment parameters; monitoring of equipment operation (including video acquisition); intelligent control of roadheader cutting load (supported by sensor technology); roadheader cutting track monitoring; roadheader fault self-diagnosis and alarm; signal exchange and interlocked control of all equipment; dust detection and automatic operation of the dust removal system; personnel detection and anti-collision in the working area; automated cutting of continuous miners, bolter miners and roadheaders; and real-time acquisition of drilling rig parameters.

Main transport monitoring system (15 points): covers the main hoisting belt conveyor, scraper stage loader or bunker scraper conveyor, bunker belt conveyor, main belt conveyor, uphill and downhill belt conveyors, gathering belt conveyor, crusher, coal feeder, belt scale, iron remover, coal bunker, electrical equipment and anti-runaway devices for rail transport.

Main transport monitoring system, references: Coal Mine Safety Regulations; GB 22340 Safety code for belt conveyors used in coal mines; MT/T 105 General technical conditions for scraper conveyors; MT/T 571.1 Electrical control system for belt conveyors used in coal mines; MT 654 Safety code for belt conveyors used in coal mines; MT/T 817 Electrical control device for belt conveyors used in coal mines; MT 872 Technical conditions for protection devices of mine belt conveyors.

Main transport monitoring system, basic requirements: remote centralized control; automatic, manual and maintenance control modes; automatic motor power balancing; online weighing with automatic running speed adjustment; high-reliability integrated protection with fibre-optic temperature measurement; automatic iron removal at key conveyor heads; fault locking, voice communication and alarm along the line; quantitative coal feeding; online coal quality monitoring; crusher blockage detection; monitoring of coal quantity, temperature, gas and CO in bunkers; online monitoring of steel cord belts; forward and reverse sequential starting; and information exchange and interlocked control of all belt conveyors.

Hoisting system (15 points): covers the main hoist, loading station, unloading station, auxiliary hoist and electrical equipment; references GB 16541 Safety technical requirements for signal systems of vertical shaft cage hoisting, GB 20181 Safety requirements for mine hoists and mine winches, MT/T 771 Monitoring devices for shaft-top car handling systems in coal mines, MT/T 1070 Energy-saving monitoring method and criteria for main hoisting belt conveyors in use in coal mines, and MT/T 1083 Technical conditions for electrical control equipment of fully digital DC drive mine hoists.

Hoisting system, basic requirements: remote and local monitoring and control; protection functions and real-time monitoring of process parameters; speed-regulated operation of the hoist; monitoring and control of the loading and unloading hydraulic stations; coal level monitoring in bunkers; statistical recording of hoisted coal quantity and power consumption; communication and interlocked control with other related subsystems; and online monitoring of wire ropes.

Auxiliary transport monitoring system (10 points), basic requirements: automatic start and stop of the aerial passenger ropeway, starting when a person boards and stopping when no one is on board, with complete protective measures and variable-frequency speed regulation; block locking of locomotives; signal and switch machine interlocking of the locomotive system; simulated display of underground locomotives; manual starting and operation monitoring of winches, multi-stage variable-frequency speed control, signals and protection; positioning, tracking and integrated dispatching of trackless rubber-tyred vehicles; online monitoring of wire ropes; online monitoring of monorail cranes; traffic signal control; and GPS positioning of other vehicles.

Power supply and distribution monitoring system (10 points): covers surface box-type substations, underground substation equipment, mining district substation equipment, surface substation equipment, mobile substations and cables; references GB 8286 Mine flameproof mobile substations, GB 50070 Standard for design of mine power, GB 50417 Code for design of underground power supply and distribution in coal mines, MT/T 114 General technical conditions for coal mine power supply monitoring systems, Coal Mine Safety Regulations and the coal mine power supply design code.

Power supply and distribution monitoring system, basic requirements: real-time data acquisition with whole-system display and subsystem display; remote and local operation; equipment monitoring and protection; online setting of equipment parameters; and high-reliability integrated protection devices with fibre-optic temperature measurement.

Water supply monitoring system (5 points): covers pumps, pipelines, flow, pressure and water quality for domestic water, production water and firefighting water; references GB 50383 Code for design of underground fire protection and sprinkling in coal mines, MT/T 627 General technical conditions for fusible alloy automatic water spray fire extinguishing systems of coal mine belt conveyors, MT/T 758 General technical conditions for electric automatic water spray fire extinguishing systems of coal mine belt conveyors, MT/T 5014 Code for design of water supply and drainage in the coal industry, and the technical specification for standardization of the six underground systems in coal mines.

Water supply monitoring system, basic requirements: automatic and manual control of water pumps; variable-frequency constant-pressure water supply control; acquisition of process parameters; system protection; online monitoring of flow and water quality; and energy-saving operation control of water pumps.

Drainage monitoring system (8 points): covers the main pump house, panel pumps, mining district pumps and flow measurement.

Drainage monitoring system, references: GB 50451 Code for design of underground drainage pumping stations and drainage pipelines in coal mines; MT/T 1128 General technical conditions for coal mine drainage monitoring systems; MT/T 1144 Remote hydrological monitoring equipment for boreholes in mining areas; MT/T 674 Technical code for mine drainage during the production period; AQ 1012 Code for safety inspection and testing of main drainage systems in use in coal mines; GB/T 18024.7 Graphical symbols for technical documents of coal mine machinery - Part 7: Compressors, ventilators and pumps; MT/T 1002 Energy-saving monitoring method and criteria for main drainage systems in use in coal mines; MT/T 5014; and the technical specification for standardization of the six underground systems in coal mines.

Drainage monitoring system, basic requirements: manual, maintenance and automatic control modes; automatic rotation of water pumps; automatic signal acquisition; system protection; automatic priming; automatic water level monitoring and control; electric control of gate valves; and energy-saving operation control of water pumps.