personnel proximity detection for longwall · 2019. 4. 30. · 11 / caterpillar confidential: green...
TRANSCRIPT
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Personnel Proximity Detection for LongwallMark JonesElectrical EngineerCaterpillar Global Mining
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AGENDA
1. Proximity detection as risk mitigation2. Basic parts of robust PPD system3. Why PPD for longwall?4. Specs and behavior5. PPD in action
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How do we address hazards?
Image courtesy NIOSH
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What are some options for personnel detection?
• Contact strips and pressure sensitive mats– Subject to wear. Users must deliberately use them and change
behavior change. Not suitable for moving equipment.
• Motion sensors and Cameras– Sporadic performance. Too many heat and motion sources.
• Light barriers/curtains– Unsuitable for moving equipment. Subject false positives.
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Basic parts of robust PPD system
PPD Tags PPD Reader/Marker Controller Network
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Why PPD for longwall?
Safety is Everyone’s Top Priority• Protecting mine site personnel
working around moving equipment• Know the location of all personnel
on the longwall• Mitigate risk from hazardous
movement• Improves training by identifying
near-miss incidents and abuse of policies
Regulatory Compliance• MSHA (Room and Pillar) and
global safety organizations mandate
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Why PPD for longwall?
• A powerful computer system can automate heavy equipment but they can also integrate proximity systems.– We do not want automated movements to occur when an individual
is working in the automated area
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Goals of a robust PPD system
• Nuisance free operation without compromising safety.• Seamless integration of multiple systems on the surface and
underground. Be supported by administrative tools on one network.
• Monitor health of the system.• Restricting equipment operation to only those trained for use.
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Specifications Overview
PPD Tag PPD Reader
Power Battery life up to 1.5 years 220mA @ 12v I.S.
Size 75 x 55 x 30 mm 200 x 200 x 120 mm
Communication
•2.4GHz Xbee Protocol •125kHz RFID•Intrinsically safe•Lightweight
•2.4GHz Xbee Protocol•125kHz RFID •PMC-R Serial•Serial debugging
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CAT PPD system - Tag options
Belt
Helmet
Loop or Bolt Visitor’s tag
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Tag capabilities
Identify presence or absence of tagged personnel on longwall• Accurate, reliable, consistent• Tags are lightweight with a battery
life of up to 1.5 years• Tags programmed specifically for
each individual ID and job role
PPD must be tailored to longwall • Broadcast speed is increased• RF zone is shrunk for greater
location precision• Battery life and health of the tag is
monitored regularly and a schedule is enforced for diagnostic testing
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How does this system work?
LF Transmitter
LF Transmitter
HFReceiver
HFReceiver
LF Receiver
LF Receiver
HFTransmitter
HFTransmitter
LF Packet• Shield Number• HF Channel
HF Packet• Tag ID• LF Power• Role
125kHz RFID Field
Controller
PPD Reader
PPD Tag
I see a tag here! Let the longwall
know.
I see a tag here! Let the longwall
know.
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Physical Implementation
• With a PPD reader on each shield the LF detection fields must be fired rapidly in an alternating fashion to prevent radio interference
• The location of a tag can be determined by the relative strengths it reports from each LF detection field
665511 22 33Strengths:Field 3, 80%Field 4, 30%
I’m in shield 3!
Strengths:Field 3, 80%Field 4, 30%
I’m in shield 3!
44PPD tag, here!
Where am I?PPD tag, here!
Where am I?
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PPD IN ACTION
Over the next few minutes I will be a mine employee and your guide at a longwall operation running PPD for longwall. You will be my visitor.
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A miner starts his shift with a new PPD tag
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At the elevator
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…at the elevator
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…at the elevator
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…at the elevator
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Walking onto the longwall
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…walking onto the longwall
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PPD in action
• When a tag is detected in a shield its protection zone extends to an additional shield in each direction
• Any automated sequence that is initiated by the system or another worker will queue for 10 seconds for the tag’s alert zone to leave the area before giving up the action
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…walking onto the longwall
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PPD in action…what if?
I’m trying to move those shields. Get
over here!
I’m trying to move those shields. Get
over here!
Hold up! This part needs to be
replaced.
Hold up! This part needs to be
replaced.
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PPD in action
Untrained user detectedKeystrokes are limitedUntrained user detectedKeystrokes are limited
*BEEP* *BEEP**BEEP*
Red Visitor Tag
Red Visitor Tag
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System Review in conclusion
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Thank You
…Any questions?