Joy 12HM31 continuous miner

12HM series

Joy 12HM31

  • Up to 20 tonnes per minute cutting rate
  • 3600-3650 mm cutting width
  • Bolted construction to meet shaft entry requirements
  • Individual motors with direct-drive transmissions to power the cutter, traction, gathering, and hydraulic systems
  • Outboard access for motors, gearcases, controllers and other major components to reduce downtime and maintenance costs
  • Remote radio control operations, with different frequencies available for multi-machine sections
  • Optidrive AC electronic system to provide smooth transmission responsiveness
  • Faceboss control platform to facilitate an optimal balance of production rate and cost

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Cutting system

As the 12HM continuous miners are the largest manufactured by Joy Global, the cutting systems have been designed to match the machine mass. This series of miners is available with a chainless cutter head with drum diameters from 1118mm to 1320mm. Depending on the cutter head design, the cutting horsepower can be as much as 520kW. Through Joy Global’s experience in this market, we also realize that all applications are different and therefore, we provide a number of different cutter bit spacing configurations.

Haulage system compatibility

The 12HM series continuous miners can be designed to match mine specific haulage systems. Different conveyor lengths and conveyor chain speeds are available to optimize the haulage system performance, whether it is batch or continuous haulage. For continuous haulage capability the conveyor can also be supplied to match up with an attached haulage system.

Traction system

VFD traction system

The Optidrive system from Joy Global provides efficient speed control from zero to maximum speed. The variable speed control provides the operator the ability to smoothly and accurately move the machine short distances when maneuvering the machine during tramming in a typical room and pillar type mining lay-out.

The Optidrive system from Joy Global also provides increased traction torque, which delivers more power and control. In addition, the cutter motor feedback, linked with the Optidrive system results in increased sump performance no matter the underground mining conditions encountered.

Bolt-on traction reducer

The bolt-on traction reducer, exclusive to the South African market, provides a full bolt-on solution, which now includes the planetary as part of the assembly. The traction reducer and planetary are pre-assembled in a clean and controlled environment. This makes the bolt-on traction reducer more maintenance friendly in a demanding mining environment.

Wethead cutterhead systems

The Wethead continuous miner cutterhead from Joy Global incorporates a fine water spray behind each cutting bit on the cutter drums. Acting as both a cooling and wetting agent, the water reduces the potential for frictional ignitions and reduces respirable dust levels. The sprays also provide lubrication that substantially improves bit life. The Wethead cutterhead does all this while potentially consuming less water than the standard miner dust sprays. The heart of the system is a back-to-back carbon-face water seal designed to last from rebuild to rebuild before refurbishment is necessary.

Proven conveyor system

The conveying system loading arms and chain offer reliable, time-tested transmissions. The conveyor chain includes universal links to prolong chain life, and the cam style adjusting mechanism automatically compensates for chain slack as the conveyor swings. Recent enhancements to the system include increased abrasion-resistant material use along the chain path and loading arms.

Now enhanced by the addition of a dual-sprocket conveyor chain, this latest innovation is driven on either side by two parallel eight-tooth sprockets. The conveyor system provides a chain that is 50% stronger while reducing total noise exposure up to 3dB, as compared to the conventional chains.

Optimized hydraulic system

The Joy hydraulic manifolds, a standard feature on all Joy continuous miners, reduces hose assemblies and fitting counts by over 30% from previous manifolds. And they significantly reduce leak points. Additional benefits realized with Joy Global's designs include the following all: serviceable parts for a hydraulic circuit are now in one common location; all pressure check points allow gauge connection and disconnection while the pump is running; bolt-on caps permit easy access for troubleshooting, or individual replacement of hydraulic or water segments on the water manifold; Joy Global's new main control valve design has 25% higher flow and 30% higher pressure capability; screw adjusted relief cartridges are now standard; improved sealing in all areas means significantly less oil leakage; a proportional control valve option is available that interfaces with the Faceboss control platform to optimize cutter motor current draw using a feedback control loop.

AAA B - mini meghead B megahead MKII
Cutting rate (tonnes per minute) up to 20 up to 20 up to 20 up to 20
Mass (estimated) 90 tonnes 105 tonnes 110 tonnes 130 tonnes
Ground pressure 223 kPa 283 kPA 295 kPa 304 kPa
Ground clearance 250 mm 285 mm 285 mm 285 mm
Cutter head diameter 1118 mm 1118 mm 1320 mm 1320 mm
Cutting width 3600 mm 3600 mm 3650 mm 3650 mm
Maximum cutting height 3800 mm 4650 mm 4800 mm 4800 mm
Minimum cutting height 1600 mm 2300 mm 2300 mm 2300 mm
Height over scrubber 1580 mm 2500 mm 2500 mm 2500 mm
Main frame height 1420 mm 2000 mm 2000 mm 2000 mm

Faceboss control system

Competitive and market pressures mean that you have to produce product at an ever-increasing rate, while always striving to decrease your cost per ton. These goals are only made more difficult by the worsening attributes of available reserves and deteriorating operating conditions.

The Faceboss control system enables your operators to operate equipment at an optimal balance of production rate and cost per ton using a powerful tool set that includes operator assistance tools, automated sequences, advanced diagnostics, machine performance monitoring, and analysis tools. Faceboss is the standard control system platform on all Joy underground mining equipment, which ensures that you receive the same level of optimization for all your Joy equipment. 

Learn how Faceboss can help control your operating costs. 

Optidrive AC

Joy Optidrive, an AC variable-frequency drive system, integrates software with the electronic and mechanical systems to provide the following features:

  • Increased tram speed: Significantly increases the tractive effort available, improving the equipment’s ability to climb gradients and negotiate difficult roadway conditions
  • Regenerative braking: Supplements the mechanical brakes, allowing them to run cooler with extended wear life; regenerative braking is highly effective at automatically maintaining constant speeds when descending gradients
  • Less maintenance: No commutator brushes to inspect and replace mean AC traction motors are typically more reliable, more durable, and require less maintenance than DC traction motors

Learn how Optidrive can help improve your productivity. 

Scrubber systems

The Joy scrubber system - an auxiliary dust control system integrated into the continuous miner - works with the mine ventilation system to help reduce overall local dust exposure. The major system components include:

  • Ductwork
  • Impingement screen
  • De-mister
  • Fan
  • Attenuator

Our scrubber systems can be configured to support localized face ventilation plans by selecting the air volume along with the inlet and discharge locations.

SmartZone proximity system

The SmartZone proximity system is an integrated training device that helps teach your personnel to operate a continuous miner from safe working zones, as well as stay clear of related danger zones. The SmartZone system tracks, recognizes, and logs personnel movements around the machine to provide in-depth analysis for your training initiatives.

Learn how SmartZone keeps train your mine personnel.

Two-way radio remote

The continuous miner two-way radio remote is designed with the operator in mind, featuring large controls for common functions (easily differentiated by feel), common functions loaded to be close to the operators' natural hand positions, and uniquely shaped levers to differentiate functions. 

Learn how the two-way radio remote makes your operator's job easier