Cable Disc Elevator: Static Friction Investigation
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Cable Disc Elevator: Static Friction Investigation C. Webb 1 & M. A. Tuck 1 Received: 14 June 2020 / Accepted: 11 November 2020 # Society for Mining, Metallurgy & Exploration Inc. 2020
Abstract This paper describes the application of a cable disc elevator to continuous lift ore vertically from underground mines. Application of this system requires the tensions developed within the cable must remain within the carrying capacity of the cable including applicable safety margins. A critical element occurs at starting the system when it is fully loaded which requires the force developed by the system to exceed the static friction forces. This paper describes the laboratory rig developed to investigate the static friction forces. Details of the results of tests on three different ores for both dry and wet conditions are given. These results are discussed. Keywords Mining . Shaft . Hoisting . Continuous hoisting . Cable disc elevator . Static friction
1 Introduction The test rig referred to as Test Rig 1 measures the static friction in the cable disc elevator. The measurements detailed in this paper are those of static friction between the ore on the disc and the steel tube. These measurements are for ore of different particle sizes, ore with added water and ore of different weights on the disc. The three ores used were from the Western Victoria region. These were brown coal, granite and gravel. Static friction can also be termed as the breakfree force that is required to get the ore on the disc to start sliding in the cable disc elevator lifting tube. The reason this data is required is to know the following:
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The investigation used two tube sizes for the static friction tests; these were 12.7 cm (5 in.) diameter and 20.3 cm (8 in.) diameter. The lifting disc for Test Rig 1 is 5 mm smaller in diameter compared to the tube. This leaves a gap between the tube and the disc of 2.5 mm. The effect that ore with different particle sizes has on the static friction. Test the ways in which this causes the elevator to jam. Observe how the ore moves on the disc when being lifted. Tests for static friction with added free water. Wet ore would be likely from mining operations. The final analysis of the data for the lifting limits and cable tension requirements based on static friction.
1. What implications exist for friction should an elevator stop in situ loaded with ore. 2. Determine which ores are favourable and unfavourable for the cable disc elevator.
2 Mine Haulage Systems The most important data required is that of the static friction required to haul the ore up the lifting side tube. Three ores were selected, gravel, granite and coal, to test the level of static friction in the cable disc elevator. This allowed investigation of the following:
* M. A. Tuck [email protected] 1
School of Science, Engineering and Information Technology, Federation University Australia, Ballarat, Victoria, Australia
Throughout mining history, many systems have been developed and used to move broken ore and rock from und
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