GROUND SUPPORT & ROCK REINFORCEMENT
and the operator adjusts its height by means of hydraulic hoses through which an emulsion ( a mixture of water and hydraulic oil ) is pumped . When the support is no longer needed , the operator reduces the pressure of the fluid by using quick release valves and withdraws the prop from the site . Mine Master has also custom designed the bolting rig Roof Master 2.4S with a special feature of having temporary roof supports . It improves safety and significantly reduces the operating costs .
For bolting in a wide range of seam heights there is the Roof Master 2.0 AR D / E , used from 2 m up to 8.5 m , designed to perform installation of mechanical as well as resin bolts with a vacuum root pump helping to maintain a dustfree environment for the operator .
One of the latest developments at Mine Master , in line with going green initiatives , is the Roof Master 1.8KE which is undergoing testing at KGHM ' s Lubin copper mine . The electric battery machine will help to reduce gas emissions , improve safety and ease maintenance . The machine is designed to work in galleries from 3 m up to 5.8 m height and is equipped with a mechanised bolting mast for nine bolts , 1.8 m in height . The battery installed on board is 120 kWh . The Mine Master driveline technology has a unique solution of charging the batteries , enabling the battery to recharge using the existing mine power network in the 500-1,000V
voltage range . For this purpose a battery charger is built on the machine chassis . In addition , the battery will even recharge as the rig is tramming downhill through regenerative braking .
Mine Master ’ s portfolio also includes its first ever bolting rig fully certified for operation in an explosive environment . All components of the machine , including electric and hydraulic systems , diesel engine and even tyres have gone through a complex certification process in accordance with the European Union Directive ( explosion-proof ATEX ). The machine , Roof Master 1.8 AWK ATEX is designed to perform roof bolting work in headings 4.3 m to 7.6 m . The bolting mast has been equipped with a bolt handler of carousel type for eight bolts . Two types of drilling are possible with this machine through change of set-up : drilling holes of 33 mm diameter in soft rock , up to 50 MPa - rotary type with air flushing and ; drilling holes of 42 mm diameter in hard rocks , up to 160 MPa - rotarypercussive type with air-water mist flushing . An option to operate the machine from either the electric network or the diesel engine is a unique feature . A 1,000L water tank has been installed directly on the machine allowing for drilling around 120 bolts with length 1.8 m while using the air-mist system , thus no additional external source of water is required .
For ultra-low seams Mine Master is offering the Roof Master 1.4 , designed for bolting hanging
walls and side walls at minimum height of 1.6 m and maximum reach up to 3 m . Maximum bolt length is 1.6 m depending on the height of the seam . For bolting in low seams there also is the Roof Master 1.7 which is designed for bolting roofs and walls at minimum height of 1.9 m and maximum reach of up to 4.5 m . The unit is designed to install both mechanical and resin bolts at the lengths of 1.6 , 1.8 and 2.6 m by a single operator . The operating controls are located next to the drilling unit , enabling accurate bolt installation . The operator stand is found directly by the roof bolting turret and it is protected by an adjustable , hydraulically operated , high-strength canopy . The RM 1.7 has been successfully implemented in oil shale mines in Estonia as well as other parts of the world .
From a concrete spraying machine perspective GHH Group has the BIS20 , an articulated concrete spraying machine designed specifically for mining applications . There are also the rigid body IS21 and IS26 machines available as well as the IS5 trailer mounted concrete spaying machine . The BIS 20 has a 34 m 3 / h concrete spraying capacity , ROPs & FOPS level 2 certified closed cabin , 4 x 4 all-wheel drive , powershift transmission and articulated steering . It has a spraying head with 350 ° rotation , ± 135 ° tilt and 8 ° oscillation and a robust manipulator with 8.5 m vertical and 9 m horizontal spraying reach at 4 m distance from the working face . The BIS20 is
OIL COOLING
DEEP UNDERGROUND
Suitable for up to 35 bar pressure , Bowman hydraulic oil coolers are the proven solution for :
• Rock Drilling & Crushing Machines
• Ancillary Mining & Tunnelling Equipment .
• Open Cast Mines with high ambient air temperature .
• Coal Mines
Visit www . ej-bowman . com , or call + 44 ( 0 ) 121 359 5401 for more information
EJ Bowman ( Birmingham ) Ltd , Chester Street , Birmingham B6 4AP , UK T + 44 ( 0 ) 121 359 5401 E sales @ ej-bowman . com W www . ej-bowman . com
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100 YEARS OF HEAT TRANSFER TECHNOLOGY
40 International Mining | AUGUST 2022