Easy Release Bolt

Introducing The New Easy Release Bolt

Donhad has designed, developed and now owns the patents to the Easy-Release Bolt Assembly, used in steel-lined ball mills. The Easy Release Bolt complements our already Internationally recognised liner bolt, however with 2 major improvement factors; reduction in safety risk and cost savings through shorter reline times.

Standard Bolt Safety Concerns

The more force required to extract a standard liner bolt requires more force and energy from the operator, as well as the tooling. Increased risks include;

  • Lifting injuries
  • Injuries from steel splinters off bolts or knockout moils
  • Sprains and strains from handling heavy tooling
  • Fatigue through exerting continuous effort
  • Line of Fire impact

ERB Solution

With a small portion of the nut protruding into the shell, less effort is required to remove the nut. In most instances the liner falls in under their own weight, removing the need for force. This vastly reduces frequency of exposure to handling heavy tooling, reduces reline times and therefore reduces the risk of fatigue. The impact zone between the moil and bolt is removed from outside the mill, to an area inside the mill shell (if knock out is required), protecting the operator from any steel fragments, and line of fire exposure.

Reduction In Reline Times

The removal of Easy-Release bolts has shown a 10% reduction in mill reline times, over a 5 day shut this equates to a 1/2 day gain. To put this into perspective the average size ball mill on a gold mine could have lost throughput revenue up to $30,000 per hour that it is down. For a 12 hour reduction in reline time, this is a potential saving of $360,000. This has been proven on a larger mill providing savings in excess of $700,000. The Easy-Release bolt is a substantial leap forward in design over the standard liner bolt; It minimises safety risks associated with bolt removal, reduces reline times and the potential for damage to the seal area, resulting in more profitable operation of the concentrator.

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