CN114499584A - Mining twisted-pair broadband multiple access multiplexing system - Google Patents
Mining twisted-pair broadband multiple access multiplexing system Download PDFInfo
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Abstract
The invention provides a mining twisted pair broadband multiple access system, which comprises a twisted pair consisting of two wires, a communication terminal, a management device and an access device, wherein the communication transmission of broadband and narrowband communication devices is realized by a shared twisted pair, the problems of low transmission rate and short transmission distance of the existing mining field bus are solved, and the problems of high network construction and maintenance cost and the like of the access device through an optical cable are also solved. The system not only can bear the communication of equipment with small data communication traffic, such as a sensor, but also can bear the communication of equipment with large data communication traffic, such as video and audio data acquisition and communication equipment, and the like, has the advantages of high transmission rate, long transmission distance, simple structure, easiness in implementation, easiness in maintenance and the like, greatly simplifies the field network structure, and improves the technical level of mine communication.
Description
Technical Field
The invention relates to a mining twisted pair broadband multiple access system, which relates to the technical fields of data acquisition, communication interfaces, communication protocols, communication control management and the like.
Background
Coal is the main energy source in China and accounts for about 70% of primary energy. The coal industry is a high-risk industry, accidents such as gas, flood, fire, a roof and coal dust disturb the safety production of coal mines, and in order to guarantee the safety production of coal, a large amount of equipment related to safety monitoring and production monitoring needs to be installed underground the coal mines, and the equipment is large in variety and quantity and has large difference in communication data quantity. At present, a plurality of networks such as monitoring, positioning, video, voice and the like exist under a coal mine, and the existing field buses for mines such as CAN, RS485, PROFIBUS, LONWORKS and the like have low transmission rate and short transmission distance and are difficult to meet the requirements of mine monitoring, positioning, monitoring and communication; the existing positioning, video and voice networks generally adopt industrial Ethernet for communication, the industrial Ethernet has long transmission distance when using optical cables, each positioning, video and voice device needs an independent optical cable to be connected with the switching device of the industrial Ethernet in order to ensure the data transmission distance of the device, the number of the optical cables required by the network is large, the construction and installation cost is high, the maintenance is very difficult, and the maintenance cost is high, so the optical cables are not suitable for being accessed into the network. In order to solve the problems, a broadband field communication system for coal mines, which has high transmission rate, low cost and convenient maintenance, is urgently needed.
Disclosure of Invention
The invention provides a mining twisted pair broadband multiple access multiplexing system, which realizes that broadband and narrowband communication equipment uniformly performs communication transmission through a shared twisted pair, solves the problems of low transmission rate and short transmission distance of the existing mining field bus, and also solves the problems of high network construction and maintenance cost and the like of accessing equipment through an optical cable. The system can bear the communication of equipment with small data communication traffic, such as a sensor, and the like, and also can bear the communication of equipment with large data communication traffic, such as video and audio data acquisition and communication equipment, and the like, has the advantages of high transmission rate, long transmission distance, simple structure, easiness in implementation, easiness in maintenance and the like, greatly simplifies an on-site network structure, and improves the technical level of mine communication.
The mining twisted pair broadband multiple access multiplexing system comprises a twisted pair consisting of two wires, a communication terminal, management equipment and at least two access devices; the system is used for transmitting digital communication, video, voice, sensor, positioning and control data through the twisted pair; the access equipment and the management equipment are connected with the twisted-pair line in parallel nearby for communication; the communication terminal is connected with the access equipment through the communication port, and the access equipment is accessed to the system nearby for communication; the access device has a unique identification number consisting of numbers; the management equipment is responsible for allocating a communication channel with a required bandwidth to the access equipment in a system initialization stage, and after the system initialization is completed, all the access equipment autonomously performs bidirectional communication in the allocated communication channel; the communication interface of the communication terminal connected with the access equipment comprises a broadband communication interface and a narrowband communication interface, the communication mode of the broadband communication interface comprises Ethernet, and the communication mode of the narrowband communication interface comprises an industrial field bus;
the communication terminal comprises underground data equipment and a communication control server; the communication control server is also connected with the comprehensive bearing network and is communicated with the ground monitoring equipment through the comprehensive bearing network, and the communication control server is responsible for controlling the forwarding of uplink data transmitted from the underground data equipment to the ground monitoring equipment and the forwarding of downlink data transmitted from the ground monitoring equipment to the underground data equipment; the underground data equipment comprises video image data acquisition equipment, sound communication equipment, safety data acquisition equipment, production data acquisition equipment, monitoring substations, positioning substations, a wireless base station, an actuator and MEC edge calculation equipment; the video image data acquisition equipment is responsible for acquiring video and image information in the mine; the sound communication equipment comprises sound collection equipment and sound playing equipment; the safety data acquisition equipment is a sensor for monitoring mine explosion, fire, coal and gas outburst, flood, rock burst, roof fall accidents or disasters; the production data acquisition equipment is a sensor for monitoring coal face, driving face, belt conveyor, electric locomotive, rubber-tyred vehicle, power supply, drainage, compressed air and ventilation production equipment; the monitoring substation is connected with a plurality of safety data acquisition devices or production data acquisition devices and collects and forwards the acquired data; the positioning substation is used for positioning a downhole moving target and acquiring and communicating positioning data; the wireless base station is used for wireless access and management of the underground mobile digital communication equipment; the actuator is used for driving the motor, the switch, the electromagnetic valve and the electro-hydraulic valve to execute servo action according to the control instruction data; the MEC edge computing equipment is used for providing data computing, storing and processing services for other downhole data equipment.
1. The mining twisted pair broadband multiple access multiplexing system further comprises an integrated communication terminal and an integrated management device which integrate the function of the access device.
2. The mining twisted pair broadband multiple access multiplexing system further comprises: the integrated bearer network comprises at least one switch; the switch is connected with at least one communication control server through a communication cable; the connection mode of the plurality of switches comprises ring connection, and communication cables used for connection comprise optical cables; the ground monitoring equipment is connected with the switch through a communication cable.
3. The mining twisted pair broadband multiple access multiplexing system further comprises: setting the identification number of the access equipment as n bits, and the initialization process of the system is as follows:
(1) the management equipment sends an inquiry instruction comprising 1 designated number, the instruction is an instruction for inquiring the communication bandwidth information of each access equipment, the designated number in the instruction is the nth bit of the identification number of the access equipment, and the designated number is sequentially increased or decreased when the instruction is sent each time;
(2) each access device receives the instruction, and the nth bit of the identification number is the same as the access device reply information of the number designated by the query instruction, wherein the information comprises the self identification number, the connected communication terminal and the communication bandwidth information thereof;
(3) if the management equipment does not receive the reply information within the set time, judging that no access equipment with the nth bit of the identification number identical to the number specified by the query instruction exists, and returning to execute the step (1) to continuously query other numbers;
(4) the management equipment analyzes and verifies the reply information, and if the verification information is successful, the reply information is recorded; if the verification information is unsuccessful, judging that the access equipment with the same nth identification number exists, recording the number, returning to the step (1) to continuously inquire other numbers until all 10 numbers are traversed;
(5) if the recorded number with unsuccessful verification information exists, the nth bit of the identification number is inquired as the number by adopting the method of the steps in the working process, and the nth-1 bit of the identification number is different access equipment; if the verification is not successful, continuously inquiring the access equipment with different (n-2) th bits of the inquiry identification number according to the method until the 1 st bit is inquired, ensuring successful verification of the information and acquiring the required communication bandwidth information of all the access equipment;
(6) the management device allocates communication channels for the access devices and notifies all the access devices in a broadcast manner.
4. The mining twisted pair broadband multiple access multiplexing system further comprises: the method for allocating communication channels to the access equipment by the system initialization is that each communication cycle is divided into a synchronous time slot, a downlink time slot and an uplink time slot;
the synchronous time slot is used for transmitting a synchronous signal by access equipment connected with the communication control server so as to ensure the clock synchronization of the access equipment in the system in the communication period;
the downlink time slot is a downlink data communication channel, and access equipment connected with the communication control server sends a modulation signal of a data packet formed by encapsulating downlink data in the time slot; the downlink time slot accounts for 10% of the communication period;
the uplink time slot is an uplink data communication channel, and the access equipment sends a modulation signal of a data packet formed by encapsulating uplink data in the time slot; the uplink time slot is divided into M sub-time slots, wherein M is the number of access devices needing uplink data communication, namely each access device needing uplink data communication occupies 1 sub-time slot; the time length T of each sub-time slotUiThe allocation is made according to the communication bandwidth required by the access device,
in the formula MWiThe number of mine data acquisition equipment accessed to the ith access equipment in a broadband communication mode, MNiThe number of mine data acquisition equipment accessed to the ith access equipment in a narrow-band communication mode, TUIs the time length of the uplink time slot.
5. The mining twisted pair broadband multiple access multiplexing system further comprises: the time length T of each sub-time slotUiThe method of assigning (1) includes human input settings.
6. The mining twisted pair broadband multiple access multiplexing system further comprises: when the system is accessed into a new access device or an original access device is accessed into a new mine data acquisition device, the access device actively and continuously raises a signal sent by the synchronous time slot so as to inform the management device to reinitialize the system.
7. The mining twisted pair broadband multiple access multiplexing system further comprises: the modulation method includes frequency modulation or phase modulation.
8. The mining twisted pair broadband multiple access multiplexing system further comprises: the checking method comprises logic checking based on communication protocol content.
9. The mining twisted pair broadband multiple access multiplexing system further comprises: the transmission process of the uplink data of the system is as follows:
(1) the access equipment receives data sent by the underground data equipment;
(2) the access equipment arranges and encapsulates the data into a data packet;
(3) the access device modulates the data packet and sends the data packet in a communication channel distributed by the management device;
(4) the access equipment connected with the communication control server demodulates signals sent by different access equipment through different channels and restores the signals into data packets;
(5) and the communication control server analyzes the data packet and forwards the data of different mine data acquisition equipment to corresponding ground monitoring equipment.
10. The mining twisted pair broadband multiple access multiplexing system further comprises: the transmission process of the uplink data of the system is as follows:
(1) the communication control server receives downlink data sent by the ground monitoring equipment;
(2) the communication control server encapsulates the downlink data into a data packet;
(3) the access equipment connected with the communication control server modulates the data packet and sends a modulation signal through a twisted pair in the distributed downlink communication channel;
(4) the access equipment demodulates the received modulation signal of the downlink communication channel and restores the demodulation signal into a data packet;
(5) the access equipment analyzes the data packet data, and if the data packet data is data sent to the local underground data equipment, the data packet data is forwarded to the local underground data equipment.
Drawings
Fig. 1 is a schematic diagram of an example implementation of a twisted pair broadband multiple access multiplexing system for a mine.
Fig. 2 is a schematic diagram of a working flow of a mining twisted pair broadband multiple access system.
Fig. 3 is an exemplary diagram of an initialization process of a twisted pair broadband multiple access multiplexing system for mining.
Fig. 4 is a schematic diagram of communication time slots of a mining twisted pair broadband multiple access multiplexing system.
Fig. 5 is a schematic diagram of an upstream communication flow of a mining twisted pair broadband multiple access multiplexing system.
Fig. 6 is a schematic diagram of downstream communication flow of a mining twisted pair broadband multiple access multiplexing system.
Fig. 7 is a schematic diagram of the access device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, specific embodiments and technical solutions of the present invention will be described in detail and fully with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Fig. 1 is a schematic diagram of an example implementation of a twisted pair broadband multiple access multiplexing system for mining, and the implementation mainly includes:
1. a management device (101) is connected in near parallel to the twisted pair line for system communication as shown. The management equipment is responsible for allocating a communication channel with a required bandwidth to the access equipment in a system initialization stage, and after the system initialization is completed, all the access equipment autonomously performs bidirectional communication in the allocated communication channel.
2. An access device (102) connected in near parallel to the system communication twisted pair as shown; the communication terminal is connected with the access equipment through the communication port, and the access equipment is accessed to the system nearby for communication; the access device has a unique identification number consisting of numbers.
3. And the communication control server (103) is a communication terminal, is connected with the access equipment and a comprehensive bearing network, and is communicated with the ground monitoring equipment through the comprehensive bearing network, and is used for controlling the forwarding of uplink data transmitted from the underground data equipment to the ground monitoring equipment and the forwarding of downlink data transmitted from the ground monitoring equipment to the underground data equipment.
4. And the video image data acquisition equipment (104) is used for acquiring video and image information in the mine and adopts a digital camera with a network communication interface.
5. And a sound communication device (105) including a sound collection device and a sound playback device, each employing a device having a digital communication interface.
6. The safety data acquisition equipment (106) is a sensor for monitoring mine explosion, fire, coal and gas outburst, flood, rock burst, roof caving accident or disaster, and comprises a methane concentration sensor, an oxygen concentration sensor, a temperature sensor, a smoke sensor, a vibration sensor, a displacement sensor, a stress sensor, a pressure sensor and the like.
7. And the production data acquisition equipment (107) is a sensor for monitoring coal face, driving face, belt conveyor, electric locomotive, rubber-tyred vehicle, power supply, drainage, air compression and ventilation production equipment.
8. And the monitoring substation (108) is connected with the plurality of safety data acquisition equipment or production data acquisition equipment and collects and forwards the acquired data.
9. And the positioning substation (109) is used for positioning a downhole moving target and acquiring and communicating positioning data, and communicates with a positioning terminal carried by underground personnel and mobile equipment in a wireless communication mode to perform ranging positioning.
10. And the wireless base station (110) is used for wireless access and management of the underground mobile digital communication equipment.
11. And the actuator (111) is used for driving the motor, the switch, the electromagnetic valve and the electro-hydraulic valve to execute servo action according to the control command data.
An MEC edge computing device (112) for providing data computation, storage, processing services for other downhole data devices
13. The underground switch (113) and the underground data exchange equipment of the comprehensive bearing network are responsible for the access and data exchange of the underground network communication equipment, are connected with the communication control server, have explosion-proof shells and meet the underground explosion-proof requirement of the coal mine. This example has 4 downhole switches, with ring type connections.
14. The system comprises an aboveground switch (114) and aboveground data exchange equipment of a comprehensive bearing network, and the aboveground switch is directly connected with aboveground equipment such as a safety monitoring server (115), a production monitoring server (116), a positioning server (117) and a monitoring terminal (118).
15. And the safety monitoring server (115) is responsible for receiving and storing the data acquired by the safety data acquisition equipment, processing the data, and early warning and alarming mine explosion, fire, coal and gas outburst, flood, rock burst, roof caving accident or disaster according to the data processing result.
16. And the production monitoring server (116) is responsible for receiving and storing the data acquired by the production data acquisition equipment, processing the data, and monitoring and alarming the coal face, the tunneling face, the belt conveyor, the electric locomotive, the rubber-tyred vehicle, the power supply equipment, the water drainage equipment, the compressed air equipment and the ventilation production equipment according to the data processing result.
17. And the positioning server (117) is used for storing mine geographic information data and positioning substation position data, receiving positioning ranging data sent by the positioning substations and providing position monitoring data service for underground personnel and mobile equipment for the monitoring terminal.
18. A monitor terminal (118); the underground monitoring data display system is responsible for providing underground monitoring data display service, real-time and historical data are provided by the safety monitoring server (115), the production monitoring server (116), the positioning server (117) and the storage server (119), flood early warning or alarm signals sent by the full monitoring server (115) and the production monitoring server (116) are received, and the underground monitoring data display system has an acousto-optic alarm function; production management personnel can call and inquire the stored historical data through the monitoring terminal.
19. A storage server (119); the video, image and sound data collected by the video image data collecting device (104) and the sound communication device (105) are stored in a centralized way, and data query and forwarding services are provided for the monitoring terminal (118).
Fig. 2 is a schematic diagram of a working process of a mining twisted pair broadband multiple access system, and the process includes:
(201) a communication terminal, a management device and at least two access devices are connected in parallel with a twisted pair of two conductors.
(202) the management device actively detects the network and detects whether the communication channel allocation of the access device is normal.
And (203) if the management device detects that the communication channel is abnormally distributed or a new access device exists, initializing and distributing the communication channel for the access device.
And 4, (204) after the management device completes initialization, all the access devices autonomously perform two-way communication in the allocated communication channel.
Fig. 3 is an exemplary diagram of an initialization process of a mining twisted pair broadband multiple access system, in this example, the system includes 3 access devices having unique identification numbers formed by 5 digits, hereinafter referred to as ID numbers, which are 12465, 11465, and 12348, respectively, and this example is a process of allocating communication channels to the 3 access devices by a management device of the system, and includes:
(301) the management device sends a query instruction including the specified number 5 and the number 9, and the query instruction is used for querying the access device with the 5 th bit of the ID number being the number 9, and meanwhile, the timer is started to time. Since there is no 5 th access device with number 9 in the system, the management device can not receive the reply message, when the timer exceeds the set time TBMThen, execute (302)
(302) the management device sends a query instruction including the specified number 5 and the number 8, and the query instruction is used for querying the access device with the ID number 5 being the number 8, and meanwhile, the timer is started to time.
(303) access device reply information with the ID number of 12348, which includes the self-identification number of the access device, the connected communication terminal and the communication bandwidth information thereof.
(304) the management device replies a confirmation message to the access device with ID number 12348.
(305) the process is basically the same as the step (301), the management device sends an instruction for inquiring the access device with the 5 th digit of the ID number being 7When the timer counts time exceeding the set time TBMIf the reply information is not received, the access equipment with the ID number 5 bit as the number 7 is judged to be absent, the same steps are continuously adopted to inquire the access equipment with the ID number 5 bit as the number 6, and after the inquiry is not finished, the access equipment with the ID number 5 bit as the number 5 is continuously inquired.
(306) access device reply message with ID numbers 12465 and 11465, the message includes self identification number and communication bandwidth information thereof. In the process, the access equipment does not have a dedicated communication channel, so that signals sent by the two access equipment will collide with each other, the management equipment fails to check the received signals, and the management equipment records the digit 5 and the number 5.
(307) similar to the process in step (301), the management device continues to query the access device with the ID number 5 having the numbers 4 to 0, and no reply is received after time out.
(308) the management device continues to query the access device with the ID number 4 having digits 9 to 0, and when querying digits 9, 8, and 7, no reply is received after time out, and when querying digit 6, step (309) occurs.
(309) the access devices with ID numbers 12465 and 11465 reply the message, the signals sent by the two access devices will collide again, so the management device fails to verify the received signals, and records digit 4 and digit 6.
(310) the management device continues to query the access devices with the ID numbers 4 th digits from 5 to 0, and no reply is received after timeout.
(311) the management device continues to query the access devices with ID numbers 3, 3 being numbers 9 to 0, and when querying numbers 9 to 5, no reply is received after time out, and when querying number 4, step (312) occurs.
(312) the access devices with ID numbers 12465 and 11465 reply with information, the signals sent by the two access devices will collide again, so the management device fails to check the received signals, and the management device records the digit number 3 and the digit number 4.
(313) the management device continues to query the access devices with the 3 rd digits of the ID number from 3 to 0, and no reply is received after time out.
(314) the management device continues to query the access devices with ID numbers 2, digits 9 to 0, and when querying digits 9 to 3, no reply is received after time out, and when querying digit 2, step (312) occurs.
(315) an access device reply message with ID number 12465.
(316) the management device replies with a confirmation message to the access device with ID number 12465.
(317) the administrative device proceeds to query the access device with the ID number 2 digit 1.
(318) an access device reply message with ID number 11465.
(319) the management device replies a confirmation message to the access device with ID number 12465.
(320) the administrative device continues to query the access device with the ID number 2 digit 0 and no reply is received on timeout.
(321) the management device continues to query the access devices with the ID number 1 having the numbers 9 to 0, and no reply is received after time out.
(322) the management device assigning a communication channel to the access device, notifying all access devices in a broadcast manner.
As shown in fig. 4, the communication time slot diagram of the mining twisted pair broadband multiple access multiplexing system includes a synchronization time slot, a downlink time slot, and an uplink time slot in each communication cycle.
1. The synchronous time slot is used for transmitting a synchronous signal by access equipment connected with the communication control server so as to ensure the clock synchronization of the access equipment in the system in the communication period.
2. The uplink time slot is an uplink data communication channel, and the access equipment sends a modulation signal of a data packet formed by encapsulating uplink data in the time slot; the uplink time slot is divided into M sub-time slots, wherein M is the number of access devices needing uplink data communication, namely each access device needing uplink data communication occupies 1 sub-time slot; the time length T of each sub-time slotUiThe allocation is made according to the communication bandwidth required by the access device,
in the formula MWiFor the ith accessNumber of mine data acquisition devices, M, accessed on the device by means of broadband communicationNiThe number of mine data acquisition equipment accessed to the ith access equipment in a narrow-band communication mode, TUIs the time length of the uplink time slot.
3. Downlink time slots are allocated to access equipment connected with the communication control server, and the downlink time slots account for 10% of a communication cycle; the time slots are synchronized.
Fig. 5 is a schematic diagram of an uplink communication flow of a mining twisted pair broadband multiple access multiplexing system, and the steps include:
(501) the access device receives data sent by a downhole data device;
(502) the access equipment arranges and encapsulates the data packets;
(503) the access device modulates the data packet and sends the data packet in a communication channel distributed by the management device;
(504) the access equipment connected with the communication control server demodulates signals sent by different access equipment through different channels and restores the signals into data packets;
and 5, (505) the communication control server analyzes the data packet and forwards the data of different mine data acquisition devices to corresponding ground monitoring devices.
Fig. 6 is a schematic diagram of a downstream communication flow of a mining twisted pair broadband multiple access multiplexing system, including the steps of:
(601) the communication control server receives downlink data sent by the ground monitoring equipment;
(602) the communication control server encapsulates the downlink data into data packets;
(603) the access device connected with the communication control server modulates the data packet, and transmits a modulation signal through a twisted pair in the distributed downlink communication channel;
(604) the access device demodulates the received modulation signal of the downlink communication channel and restores the demodulation signal into a data packet;
(605) the access equipment analyzes the data packet data, and if the data packet data is data sent to the local downhole data equipment, the data packet data is forwarded to the local downhole data equipment.
The access device principle composition is as shown in fig. 7, the hardware composition design of the management device and the communication control server is basically the same as that of the access device, and the corresponding specific functions are realized by different running programs.
1. The processor (701), which needs to operate at a frequency higher than 150MHz and 32 bits, may be a StrongARM core 32-BitRICSI microprocessor, operating at 166/200/233 MHz.
2. The storage unit (702) is used for storing data and adopts an SRAM (static random Access memory) or SDRAM (synchronous dynamic random Access memory) standard storage unit;
3. the power supply unit (703) comprises a battery, a voltage conversion and battery charging and discharging management part, wherein the battery uses a lithium ion storage battery and has a standby power supply function, the battery capacity can guarantee that the substation normally works for more than 2 hours without external power supply, the lithium battery has an anti-reverse connection function, an internal protection circuit and an external protection circuit are arranged, and the power supply unit has the functions of preventing overcharge, over-discharge, overcurrent, short circuit and the like, and also has the functions of equalizing charge and equalizing discharge. The voltage conversion is responsible for converting the power supply into the voltage required by other unit elements and lithium battery charging, and a MAX1724 power supply chip is adopted. The battery charging management core chip adopts a CS0301 lithium battery charging management chip.
4. Ethernet interface (704), core chip can adopt Atheros AR8035, support hundred megaEthernet, adopt standard Ethernet RJ45 communication interface terminal.
5. The industrial field bus interface (705) adopts communication modules such as an industrial field bus interface module and an RS232 digital communication interface module, and also comprises corresponding digital communication interface terminals.
6. A system interface (706) comprising a driver circuit and a twisted pair interface terminal for connecting the mining twisted pair broadband multiple access system communication twisted pair.
Claims (11)
1. The mining twisted pair broadband multiple access multiplexing system is characterized in that: the system comprises a twisted pair formed by two wires, a communication terminal, a management device and at least two access devices; the system is used for transmitting digital communication, video, voice, sensor, positioning and control data through the twisted pair; the access equipment and the management equipment are connected with the twisted-pair line in parallel nearby for communication; the communication terminal is connected with the access equipment through the communication port, and the access equipment is accessed to the system nearby for communication; the access device has a unique identification number consisting of numbers; the management equipment is responsible for allocating a communication channel with a required bandwidth to the access equipment in a system initialization stage, and after the system initialization is completed, all the access equipment autonomously performs bidirectional communication in the allocated communication channel; the communication interface of the communication terminal connected with the access equipment comprises a broadband communication interface and a narrowband communication interface, the communication mode of the broadband communication interface comprises Ethernet, and the communication mode of the narrowband communication interface comprises an industrial field bus;
the communication terminal comprises underground data equipment and a communication control server; the communication control server is also connected with the comprehensive bearing network and is communicated with the ground monitoring equipment through the comprehensive bearing network, and the communication control server is responsible for controlling the forwarding of uplink data transmitted from the underground data equipment to the ground monitoring equipment and the forwarding of downlink data transmitted from the ground monitoring equipment to the underground data equipment; the underground data equipment comprises video image data acquisition equipment, sound communication equipment, safety data acquisition equipment, production data acquisition equipment, monitoring substations, positioning substations, a wireless base station, an actuator and MEC edge calculation equipment; the video image data acquisition equipment is responsible for acquiring video and image information in the mine; the sound communication equipment comprises sound collection equipment and sound playing equipment; the safety data acquisition equipment is a sensor for monitoring mine explosion, fire, coal and gas outburst, flood, rock burst, roof fall accidents or disasters; the production data acquisition equipment is a sensor for monitoring coal face, driving face, belt conveyor, electric locomotive, rubber-tyred vehicle, power supply, drainage, compressed air and ventilation production equipment; the monitoring substation is connected with a plurality of safety data acquisition devices or production data acquisition devices and collects and forwards the acquired data; the positioning substation is used for positioning a downhole moving target and acquiring and communicating positioning data; the wireless base station is used for wireless access and management of the underground mobile digital communication equipment; the actuator is used for driving the motor, the switch, the electromagnetic valve and the electro-hydraulic valve to execute servo action according to the control instruction data; the MEC edge computing equipment is used for providing data computing, storing and processing services for other downhole data equipment.
2. The mining twisted pair broadband multiple access system of claim 1, wherein: the system further comprises an integrated communication terminal and an integrated management device which integrate the functions of the access device.
3. The mining twisted pair broadband multiple access system of claim 1, wherein: the integrated bearer network comprises at least one switch; the switch is connected with at least one communication control server through a communication cable; the connection mode of the plurality of switches comprises ring connection, and communication cables used for connection comprise optical cables; the ground monitoring equipment is connected with the switch through a communication cable.
4. The mining twisted pair broadband multiple access system of claim 1, wherein: setting the identification number of the access equipment as n bits, and the initialization process of the system is as follows:
(1) the management equipment sends an inquiry instruction comprising 1 designated number, the instruction is an instruction for inquiring the communication bandwidth information of each access equipment, the designated number in the instruction is the nth bit of the identification number of the access equipment, and the designated number is sequentially increased or decreased when the instruction is sent each time;
(2) each access device receives the instruction, and the nth bit of the identification number is the same as the access device reply information of the number designated by the query instruction, wherein the information comprises the self identification number, the connected communication terminal and the communication bandwidth information thereof;
(3) if the management equipment does not receive the reply information within the set time, judging that no access equipment with the nth bit of the identification number identical to the number specified by the query instruction exists, and returning to execute the step (1) to continuously query other numbers;
(4) the management equipment analyzes and verifies the reply information, and if the verification information is successful, the reply information is recorded; if the verification information is unsuccessful, judging that the access equipment with the same nth identification number exists, recording the number, returning to the step (1) to continuously inquire other numbers until all 10 numbers are traversed;
(5) if the recorded number with unsuccessful verification information exists, the nth bit of the identification number is inquired as the number by adopting the method of the steps in the working process, and the nth-1 bit of the identification number is different access equipment; if the verification is not successful, continuously inquiring the access equipment with different (n-2) th bits of the inquiry identification number according to the method until the 1 st bit is inquired, ensuring successful verification of the information and acquiring the required communication bandwidth information of all the access equipment;
(6) the management device allocates communication channels for the access devices and notifies all the access devices in a broadcast manner.
5. The mining twisted pair broadband multiple access system of claim 1, wherein: the method for allocating communication channels to the access equipment by the system initialization is that each communication cycle is divided into a synchronous time slot, a downlink time slot and an uplink time slot;
the synchronous time slot is used for transmitting a synchronous signal by access equipment connected with the communication control server so as to ensure the clock synchronization of the access equipment in the system in the communication period;
the downlink time slot is a downlink data communication channel, and access equipment connected with the communication control server sends a modulation signal of a data packet formed by encapsulating downlink data in the time slot; the downlink time slot accounts for 10% of the communication period;
the uplink time slot is an uplink data communication channel, and the access equipment sends a modulation signal of a data packet formed by encapsulating uplink data in the time slot; the uplink time slot is divided into M sub-time slots, wherein M is the number of access devices needing uplink data communication, namely each access device needing uplink data communication occupies 1 sub-time slot; the time length T of each sub-time slotUiThe allocation is made according to the communication bandwidth required by the access device,
in the formula MWiThe number of mine data acquisition equipment accessed to the ith access equipment in a broadband communication mode, MNiThe number of mine data acquisition equipment accessed to the ith access equipment in a narrow-band communication mode, TUIs the time length of the uplink time slot.
6. The mining twisted pair broadband multiple access system of claim 5, wherein: the time length T of each sub-time slotUiThe assignment method of (2) includes human input settings.
7. The mining twisted pair broadband multiple access system of claim 5, wherein: when the system is accessed into a new access device or an original access device is accessed into a new mine data acquisition device, the access device actively and continuously raises a signal sent by the synchronous time slot so as to inform the management device to reinitialize the system.
8. The mining twisted pair broadband multiple access system of claim 5, wherein: the modulation method includes frequency modulation or phase modulation.
9. The mining twisted pair broadband multiple access system of claim 5, wherein: the checking method comprises logic checking based on communication protocol content.
10. The mining twisted pair broadband multiple access system of claim 1, wherein: the transmission process of the uplink data of the system is as follows:
(1) the access equipment receives data sent by the underground data equipment;
(2) the access equipment arranges and encapsulates the data into a data packet;
(3) the access device modulates the data packet and transmits the data packet in a communication channel distributed by the management device;
(4) the access device connected with the communication control server demodulates signals sent by different access devices through different channels and restores the signals into data packets;
(5) and the communication control server analyzes the data packet and forwards the data of different mine data acquisition equipment to corresponding ground monitoring equipment.
11. The mining twisted pair broadband multiple access system of claim 1, wherein: the transmission process of the uplink data of the system is as follows:
(1) the communication control server receives downlink data sent by the ground monitoring equipment;
(2) the communication control server encapsulates the downlink data into a data packet;
(3) the access equipment connected with the communication control server modulates the data packet and sends a modulation signal through a twisted pair in the distributed downlink communication channel;
(4) the access equipment demodulates the received modulation signal of the downlink communication channel and restores the demodulation signal into a data packet;
(5) the access equipment analyzes the data packet data, and if the data packet data is data sent to the local underground data equipment, the data packet data is forwarded to the local underground data equipment.
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