CN109327369A - Mine hydraulic bracket communication network extender and its application method - Google Patents
Mine hydraulic bracket communication network extender and its application method Download PDFInfo
- Publication number
- CN109327369A CN109327369A CN201811307952.2A CN201811307952A CN109327369A CN 109327369 A CN109327369 A CN 109327369A CN 201811307952 A CN201811307952 A CN 201811307952A CN 109327369 A CN109327369 A CN 109327369A
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- CN
- China
- Prior art keywords
- interface
- ethernet
- vehicle
- phy chip
- communication
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004606 Fillers/Extenders Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 10
- 238000002955 isolation Methods 0.000 claims abstract description 18
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Small-Scale Networks (AREA)
Abstract
The invention discloses a kind of mine hydraulic bracket communication network extenders, including single-chip microcontroller, common ethernet PHY chip, vehicle-mounted ethernet PHY chip, Ethernet isolation circuit, the first CAN interface, the second CAN interface, CAN isolation circuit, common Ethernet interface and vehicle-mounted Ethernet interface；The communication interface of single-chip microcontroller is communicated to connect with common ethernet PHY chip, vehicle-mounted ethernet PHY chip and the second CAN interface respectively, and is communicated to connect by CAN isolation circuit and the first CAN interface；Common Ethernet interface is communicated to connect by Ethernet isolation circuit and common ethernet PHY chip；Vehicle-mounted Ethernet interface and vehicle-mounted ethernet PHY chip communicate to connect；Connection is in communication with each other by MII interface between common ethernet PHY chip and vehicle-mounted ethernet PHY chip.The invention has the advantages that the communication distance of hydraulic bracket controller network interface is extended by network extender, so that communication distance reaches 100 meters.
Description
Technical field
The present invention relates to mine hydraulic brackets, more particularly, to mine hydraulic bracket communication network extender and its user
Method.
Background technique
CAN communication mode is mostly used to form communication bus between frame, still, CAN communication at present between hydraulic bracket controller
The message transmission rate of mode is up to 1Mbps, this just seems not applicable for modernization fully-mechanized mining working.It is attempted to use
Vehicle-mounted Ethernet and CAN form the communication bus between hydraulic support, this is because vehicle-mounted Ethernet is using a pair of of difference
Signal realizes the transmitted in both directions of 10/100Mbps data, and has used special coding mode, and the fundamental frequency for transmitting data becomes
In order to which the fundamental frequency of the common Ethernet data transmission of 66MHz(is 125MHz), it is electrical special to improve EMI/RF etc. in this way
Property, while reducing wiring difficulty and wiring cost.But the maximum communication distance of vehicle-mounted Ethernet is 15 meters, according to product
Cable quality and connection mode, actual communication distance is shorter；And in underground, hydraulic bracket controller to end station
This section of distance, after some time it is possible to reach 50 meters even longer, simultaneously because the limitation of certain hydraulic bracket controller placement positions, two controls
The distance between device processed is likely to be breached 100m much larger than 10m(), this will lead to and can not carry out between each hydraulic bracket controller
Communication.
Summary of the invention
It is an object of that present invention to provide a kind of mine hydraulic bracket communication network extender, another object of the present invention is to provide
The application method of the network extender.
To achieve the above object, the present invention takes following technical proposals:
Mine hydraulic bracket communication network extender of the present invention, including it is single-chip microcontroller, common ethernet PHY chip, vehicle-mounted
Ethernet PHY chip, Ethernet isolation circuit, the first CAN interface, the second CAN interface, CAN isolation circuit, common Ethernet connect
Mouth and vehicle-mounted Ethernet interface；The communication interface of the single-chip microcontroller respectively with the common ethernet PHY chip, vehicle-mounted Ethernet
PHY chip and the communication connection of the second CAN interface, and communicated to connect by the CAN isolation circuit and first CAN interface；
The common Ethernet interface is communicated to connect by Ethernet isolation circuit and common ethernet PHY chip；The vehicle-mounted ether
Network interface and vehicle-mounted ethernet PHY chip communicate to connect；Lead between common ethernet PHY chip and vehicle-mounted ethernet PHY chip
It crosses MII interface and is in communication with each other connection.
The application method of the mine hydraulic bracket communication network extender carries out as steps described below:
The first step needs to be separately connected the network extender on the hydraulic bracket controller communicated first at two, it may be assumed that
The vehicle-mounted Ethernet interface and CAN interface of every hydraulic bracket controller are described vehicle-mounted with network extender respectively
Ethernet interface is connected with second CAN interface；It is general by being converted to vehicle-mounted ethernet signal inside network extender
Logical ethernet signal, while CAN signal being forwarded；
Second step leads to the common Ethernet interface of two network extenders, the second CAN interface in the first step by explosion-proof
News cable is correspondingly connected with, and transmits the common ethernet signal of 100Mbps and CAN signal respectively.
The invention has the advantages that solving between existing hydraulic bracket controller using data present in CAN communication mode
The low deficiency of transmission rate, while overcoming again and realizing that communication has communication between hydraulic bracket controller using vehicle-mounted Ethernet
Apart from short deficiency.The communication distance of hydraulic bracket controller network interface is extended by network extender so that communication away from
From reaching 100 meters.Meanwhile the present invention realizes vehicle-mounted Ethernet principal and subordinate auto-negotiation functionality using low speed CAN bus, uses
Convenience greatly increases.
Detailed description of the invention
Fig. 1 is the circuit structure block diagram of mine hydraulic bracket communication network extender of the present invention.
Fig. 2 is the use state connection block diagram of mine hydraulic bracket communication network extender of the present invention.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention, the present embodiment before being with technical solution of the present invention
It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down
State embodiment.
As shown in Figure 1, mine hydraulic bracket communication network extender of the present invention, including single-chip microcontroller, common ether
Net PHY chip, vehicle-mounted ethernet PHY chip, Ethernet isolation circuit, the first CAN interface, the second CAN interface, CAN isolation electricity
Road, common Ethernet interface and vehicle-mounted Ethernet interface；The communication interface of the single-chip microcontroller respectively with the common ethernet PHY
Chip, vehicle-mounted ethernet PHY chip and the communication connection of the second CAN interface, and pass through the CAN isolation circuit and described first
CAN interface communication connection；The common Ethernet interface passes through Ethernet isolation circuit and common ethernet PHY chip communication link
It connects；The vehicle-mounted Ethernet interface and vehicle-mounted ethernet PHY chip communicate to connect；Common ethernet PHY chip and vehicle-mounted ether
Connection is in communication with each other by MII interface between net PHY chip.
As shown in Fig. 2, the application method of mine hydraulic bracket communication network extender of the present invention, as steps described below
It carries out:
The first step needs to be separately connected the network extender on the hydraulic bracket controller communicated first at two, it may be assumed that
The vehicle-mounted Ethernet interface and CAN interface of every hydraulic bracket controller are described vehicle-mounted with network extender respectively
Ethernet interface is connected with second CAN interface；It is general by being converted to vehicle-mounted ethernet signal inside network extender
Logical ethernet signal；
Second step leads to the common Ethernet interface of two network extenders, the second CAN interface in the first step by explosion-proof
News cable is correspondingly connected with, and transmits the common ethernet signal of 100M and CAN signal respectively.
Working principle of the present invention is summarized as follows:
Hydraulic bracket controller is connect by mine cable with network extender, and signal includes vehicle-mounted Ethernet, CAN and power supply.
After the completion of hydraulic bracket controller powers on, powered by explosion-proof communication cable to network extender, network extender
Communication connection is established by CAN signal and adjacent hydraulic bracket controller after powering on.Meanwhile hydraulic bracket controller passes through
The configuration information of vehicle-mounted Ethernet is sent to network extender by CAN communication, and configuration information includes vehicle-mounted Ethernet interface principal and subordinate
Relationship, (explanation: vehicle-mounted Ethernet interface does not support auto negotiation to interface rate etc., and the acquisition of these information needs CAN interface
Auxiliary, and common Ethernet interface is to support auto-negotiation, this type of information can be obtained by not needing other interfaces auxiliary)；Network
The configuration information that extender is issued according to hydraulic bracket controller configures vehicle-mounted ethernet PHY chip, so far network extender with
Hydraulic bracket controller establishes vehicle-mounted ethernet communication.
Vehicle-mounted ethernet signal is connected to vehicle-mounted ethernet PHY chip, vehicle-mounted ethernet PHY core after entering network extender
Piece converts the 100Mbps physical layer signal transmitted on a pair of of twisted pair to the MII interface signal of MAC layer.
The MII interface signal of vehicle-mounted ethernet PHY chip is docked with general ethernet PHY chip MII interface, then by general
MII signal is converted common ethernet physical layer signal by logical ethernet PHY chip, passes through explosion-proof communication cable and another net
Network extender establishes communication.
Single-chip microcontroller also realizes the function of CAN communication relaying other than configuring vehicle-mounted ethernet PHY chip.
The present invention realizes the vehicle-mounted ethernet communication of hydraulic bracket controller by two network extender docking and CAN is logical
News are apart from extended function.Since two network extenders belong to different power domains (not altogether), it is therefore desirable to use ether
Signal is isolated for net isolation circuit and CAN isolation circuit, to improve the reliability of communication.
Claims (2)
1. a kind of mine hydraulic bracket communication network extender, it is characterised in that: including single-chip microcontroller, common ethernet PHY chip,
Vehicle-mounted ethernet PHY chip, Ethernet isolation circuit, the first CAN interface, the second CAN interface, CAN isolation circuit, common ether
Network interface and vehicle-mounted Ethernet interface；The communication interface of the single-chip microcontroller respectively with the common ethernet PHY chip, it is vehicle-mounted with
Too net PHY chip and the communication connection of the second CAN interface, and pass through the CAN isolation circuit and the first CAN interface communication link
It connects；The common Ethernet interface is communicated to connect by Ethernet isolation circuit and common ethernet PHY chip；It is described it is vehicle-mounted with
Too network interface and vehicle-mounted ethernet PHY chip communicate to connect；Between common ethernet PHY chip and vehicle-mounted ethernet PHY chip
Connection is in communication with each other by MII interface.
2. the application method of mine hydraulic bracket communication network extender as described in claim 1, it is characterised in that: according to following
Step carries out:
The first step needs to be separately connected the network extender on the hydraulic bracket controller communicated first at two, it may be assumed that
The vehicle-mounted Ethernet interface and CAN interface of every hydraulic bracket controller are described vehicle-mounted with network extender respectively
Ethernet interface is connected with second CAN interface；It is general by being converted to vehicle-mounted ethernet signal inside network extender
Logical ethernet signal, while CAN signal being forwarded；
Second step leads to the common Ethernet interface of two network extenders, the second CAN interface in the first step by explosion-proof
News cable is correspondingly connected with, and transmits the common ethernet signal of 100Mbps and CAN signal respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811307952.2A CN109327369A (en) | 2018-11-05 | 2018-11-05 | Mine hydraulic bracket communication network extender and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811307952.2A CN109327369A (en) | 2018-11-05 | 2018-11-05 | Mine hydraulic bracket communication network extender and its application method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109327369A true CN109327369A (en) | 2019-02-12 |
Family
ID=65261052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811307952.2A Withdrawn CN109327369A (en) | 2018-11-05 | 2018-11-05 | Mine hydraulic bracket communication network extender and its application method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109327369A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230216704A1 (en) * | 2020-06-12 | 2023-07-06 | AutoNetworksTechnologies, Ltd. | Onboard apparatus, onboard communication system, and communication control method |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0860705A (en) * | 1994-08-19 | 1996-03-05 | Shin Caterpillar Mitsubishi Ltd | Output support device of construction equipment |
| CN201418079Y (en) * | 2009-05-26 | 2010-03-03 | 山西晋城无烟煤矿业集团有限责任公司 | CAN bus repeater for mining use |
| CN101907887A (en) * | 2010-07-28 | 2010-12-08 | 广州日滨科技发展有限公司 | Mine hydraulic support controller, support control system and communication method |
| CN102801594A (en) * | 2012-07-09 | 2012-11-28 | 宁波长壁流体动力科技有限公司 | CAN (Controller Area Network) bus repeater of electro-hydraulic control system of coal mine hydraulic bracket |
| CN202652211U (en) * | 2012-05-16 | 2013-01-02 | 吴国有 | Mine-used network extender |
| CN103546297A (en) * | 2012-07-16 | 2014-01-29 | 长春工业大学 | Mine CAN bus repeater |
| CN203618007U (en) * | 2013-11-13 | 2014-05-28 | 四川微迪通信技术有限公司 | Multichannel Ethernet cable extender main terminal with optical port |
| CN104533496A (en) * | 2014-12-26 | 2015-04-22 | 中国矿业大学 | Grouping pushing-sliding control system and method for intelligent hydraulic supports |
| CN205154134U (en) * | 2015-12-07 | 2016-04-13 | 上海神开石油化工装备股份有限公司 | Ocean type drilling parameter appearance system |
| CN106507051A (en) * | 2016-11-21 | 2017-03-15 | 广州日滨科技发展有限公司 | A kind of fully-mechanized mining working is electro-hydraulic to control integrated video Transmission system and method |
| CN207603637U (en) * | 2017-12-29 | 2018-07-10 | 杭州海康威视数字技术股份有限公司 | Network system and network extender |
| CN108418904A (en) * | 2018-06-05 | 2018-08-17 | 天地科技股份有限公司上海分公司 | Ethernet communication control device and fully-mechanized mining working communication network |
| CN108418604A (en) * | 2018-05-16 | 2018-08-17 | 常州信息职业技术学院 | A kind of Ethernet cable communication extender |
| CN108457702A (en) * | 2018-05-31 | 2018-08-28 | 山东科技大学 | A kind of system and method obtaining goaf fragmented rock body lumpiness gradation |
| CN108468543A (en) * | 2018-03-09 | 2018-08-31 | 北京天地玛珂电液控制系统有限公司 | The cooperative control method and system of fully-mechanized mining working and two lane equipment |
| CN207947806U (en) * | 2018-03-22 | 2018-10-09 | 山东川杰信息技术有限公司 | Stage Lighting Protocol Extender Based on Ethernet Transmission |
| CN110351170A (en) * | 2018-04-03 | 2019-10-18 | 安徽工程大学 | Intelligent voice system under a kind of dual CAN bus redundancy structure mine |
-
2018
- 2018-11-05 CN CN201811307952.2A patent/CN109327369A/en not_active Withdrawn
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0860705A (en) * | 1994-08-19 | 1996-03-05 | Shin Caterpillar Mitsubishi Ltd | Output support device of construction equipment |
| CN201418079Y (en) * | 2009-05-26 | 2010-03-03 | 山西晋城无烟煤矿业集团有限责任公司 | CAN bus repeater for mining use |
| CN101907887A (en) * | 2010-07-28 | 2010-12-08 | 广州日滨科技发展有限公司 | Mine hydraulic support controller, support control system and communication method |
| CN202652211U (en) * | 2012-05-16 | 2013-01-02 | 吴国有 | Mine-used network extender |
| CN102801594A (en) * | 2012-07-09 | 2012-11-28 | 宁波长壁流体动力科技有限公司 | CAN (Controller Area Network) bus repeater of electro-hydraulic control system of coal mine hydraulic bracket |
| CN103546297A (en) * | 2012-07-16 | 2014-01-29 | 长春工业大学 | Mine CAN bus repeater |
| CN203618007U (en) * | 2013-11-13 | 2014-05-28 | 四川微迪通信技术有限公司 | Multichannel Ethernet cable extender main terminal with optical port |
| CN104533496A (en) * | 2014-12-26 | 2015-04-22 | 中国矿业大学 | Grouping pushing-sliding control system and method for intelligent hydraulic supports |
| CN205154134U (en) * | 2015-12-07 | 2016-04-13 | 上海神开石油化工装备股份有限公司 | Ocean type drilling parameter appearance system |
| CN106507051A (en) * | 2016-11-21 | 2017-03-15 | 广州日滨科技发展有限公司 | A kind of fully-mechanized mining working is electro-hydraulic to control integrated video Transmission system and method |
| CN207603637U (en) * | 2017-12-29 | 2018-07-10 | 杭州海康威视数字技术股份有限公司 | Network system and network extender |
| CN108468543A (en) * | 2018-03-09 | 2018-08-31 | 北京天地玛珂电液控制系统有限公司 | The cooperative control method and system of fully-mechanized mining working and two lane equipment |
| CN207947806U (en) * | 2018-03-22 | 2018-10-09 | 山东川杰信息技术有限公司 | Stage Lighting Protocol Extender Based on Ethernet Transmission |
| CN110351170A (en) * | 2018-04-03 | 2019-10-18 | 安徽工程大学 | Intelligent voice system under a kind of dual CAN bus redundancy structure mine |
| CN108418604A (en) * | 2018-05-16 | 2018-08-17 | 常州信息职业技术学院 | A kind of Ethernet cable communication extender |
| CN108457702A (en) * | 2018-05-31 | 2018-08-28 | 山东科技大学 | A kind of system and method obtaining goaf fragmented rock body lumpiness gradation |
| CN108418904A (en) * | 2018-06-05 | 2018-08-17 | 天地科技股份有限公司上海分公司 | Ethernet communication control device and fully-mechanized mining working communication network |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230216704A1 (en) * | 2020-06-12 | 2023-07-06 | AutoNetworksTechnologies, Ltd. | Onboard apparatus, onboard communication system, and communication control method |
| US11936493B2 (en) * | 2020-06-12 | 2024-03-19 | Autonetworks Technologies, Ltd. | Onboard apparatus, onboard communication system, and communication control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201125 Address after: 450016 No. ninth, 167 Avenue, Zhengzhou Economic Development Zone, Henan, China Applicant after: HYDRAULIC & ELECTRIC CONTROL EQUIPMENT CO LTD ZHENGZHOU COAL MINING MACHINERY GROUP Co.,Ltd. Applicant after: ZHENGZHOU COAL MINING MACHINERY GROUP Co.,Ltd. Address before: 450016 No. ninth, 167 Avenue, Zhengzhou Economic Development Zone, Henan, China Applicant before: HYDRAULIC & ELECTRIC CONTROL EQUIPMENT CO LTD ZHENGZHOU COAL MINING MACHINERY GROUP Co.,Ltd. |
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| TA01 | Transfer of patent application right | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190212 |
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| WW01 | Invention patent application withdrawn after publication |