# Presentation: 239044

## JoyMist DrillingSystemPresented By:Dave PaichJoy Mining Machinery

## What is Mist Drilling?

**Joy’s Mist Drilling System is patented as a “Low volume air-water drilling systems and methods”**

## Mist Drilling

- Mist Drilling is a positive displacement method of flushing the drill hole
- It uses a mixture of low pressure air and water to flush the drill cuttings away from the drill bit
- The air and water are combined in a simple mixing chamber
- Mine supply water is used
- A compressor is onboard the bolting machine, to provide the required air supply

## Slide 4

## Simplified Misting Block Diagram

**Simplified Misting Block Diagram**

## Joy Mist Drilling System

## Over Dry Drilling – Reduction in Noise Exposure*

**Mist Drilling Advantages**

**  ****Dry Drilling**
**Avg dBA = 101.7**
**As much as 10 dBa reductions seen in some cases**
**Mist Drilling**
**Avg dBA = 91.2**

- *Information
- Courtesy
- of NIOSH

## Over Dry Drilling – Reduction in Noise Exposure

**Mist Drilling Advantages**

**Avg dBA = 94.6**
**DOSE = 0.5% per bolt**
**200 bolts per shift to reach 100% dose**

**Avg dBA = 89.4**
**DOSE = 0.2% per bolt**
**500 bolts per shift to reach 100% dose**

## Joy Mist Drilling System

**Joy Mist Drilling System**

- Mist Block

- Mist Block

- Tank

- Compressor

- Heat
- Exchanger

- 18 GPM Hyd Oil

**3 GPM**

**15 GPM**

- Water Supply

**120 psi 50 cfm**

**<1 GPM**

- Mist
- Out

## Joy Mist Drilling System

**Bluefield Coal Show Display****September 2003****Mine Expo - Oct 2004**

## COMPRESSOR

- Hydraulic Drive
- 29”L x 20”H x 18”W

**Joy Mist Drilling System**

## Joy Mist Drilling System

- 	Heat Exchanger

**Fan Motor**
- 26”L x 22”H x 13”W

**Joy Mist Drilling System**

## Joy Mist Drilling System

- 	Water Tank: 30 gal
- 	40”L x 16”Dia.

**30 gal tank for onboard water supply. **
**Experimentation with other options**
-  Accumulator
-  Reservior

**Joy Mist Drilling System**

## Joy Mist Drilling System

- Mist
- Block

**Joy Mist Drilling System**

- 16”L x 10”H x 8.5”W

## Rotation units
 Use Wet Type
 Customer Supplied
 Positive Seal Required 

-  Use Wet Type
-  Customer Supplied
-  Positive Seal Required

**Joy Mist Drilling System**

## Lessons from first trial:

- Steels
-    Need to seal
- Bits
-    5-10x life
- Varying Strata
-    Vary Thrust

**Joy Mist Drilling System**

## Joy Mist Drilling System

**Options**

** ****Reservoir with Pump**
** ****Accumulator**
** ****Pilot mist valve**
** ****Water cooled w/ over temp shutdown**

## Joy Mist Drilling System

- System installed above ground with reservoir

**Joy Mist Drilling System**

## 2nd Trial

**2****nd**** Trial**

- No Tank - 700 psi water supply
- From Wet to Mist
- Floor dried up
- Operators happy
- Mine management happy
- Trial system purchased

**Joy Mist Drilling System**

## Joy Mist Drilling System

- Mist Block

- Mist Block

- Tank

**Compressor**

**Heat**
**Exchanger**
**Tube**

- 15 GPM Hyd Oil

**Transmission Fluid ATF**

- Water Supply

**120 psi 50 cfm**

**<1 GPM**

- Mist
- Out

**Piston Accumulator**

**High Temp**
**Dump Valve**

**Miner-Bolter Configuration**
_**Water Cooled**_

## Joy Mist Drilling System

**Miner-Bolter Configuration Installation **

## Mist Drilling Advantages

- Wet Drilling
- Reduction in water consumption by up to 90%.
- Improved operator environment
- Improved floor and roof conditions
- Reduced moisture content in coal

- Dry Drilling
- Reduced noise levels
- Improved bit life saves time and $$
- Improved penetration rates (depends on bit and roof conditions)
- Reduction in respirable dust
- Cleaner holes
- Reduces impact of moisture in overlying strata
- Reduced maintenance
- Fewer components