Safety is the primary utility of a roof bolter. It is used to secure the mine roof in order to enable them to become self-supportive and prevent accidents. However, despite the numerous forays into coal mining technology and the constant efforts to make it a relatively safer occupation, roof bolting is still seen as a somewhat hazardous occupation, accounting for nearly 56% of all accidents and injuries that occur during coal mining operations
A popular design is the Top Mount Roof Bolter, which sets the benchmark when it comes to handheld pneumatic drills, this roof bolter is composed of supreme quality steel and composite materials, providing tensile strength as well as lightweight maneuverability allowing it to be operated in a small area. In coal mining operations where the area of function is large and time is of the essence, a roof bolter that can be easily removed, placed and used is essential to effectiveness.
The larger Roof bolter machines are basically of two types:
• Single boom
• Dual boom
Single boom roof bolters use one setting to install roof bolts. After installation, the machine needs to be repositioned in order to insert the next bolt. The total area of support is commonly 5 feet by 5 feet square meters
Dual boom roof bolters have a bar or beam type ATRS (automated temporary roof support) system which enables multiple roof bolts to be installed from the same machine. This, however, needs a much larger area of support to ensure non-collapse, with a typical load capacity usually in excess of 15,309 kilograms.
The advantages of a dual boom roof bolting machine over a single boom are that firstly, it will take half the time to do the job, blessed as it is with two drill booms instead of one. There's no need for repositioning, so multiple roof bolts can be installed over a larger area in a shorter space of time