(Introduction, results, summary) (PDF, 69 kB) - Queensland Mining ...
(Introduction, results, summary) (PDF, 69 kB) - Queensland Mining ...
(Introduction, results, summary) (PDF, 69 kB) - Queensland Mining ...
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and manipulating refer to the time the tyre or tyre and rim assembly is being<br />
handled when not bolted to the truck or in storage etc. The equipment used to<br />
grip the tyres has grown up from the days when tyres were not as large as they<br />
are today.<br />
2) Visibility is better on fork lift style tyre handling equipment. Forklift may be a<br />
better option that FEL and it potentially removes a person from between<br />
vehicle and tyre.<br />
I have been provided with information from Keith Larsen, Manager Engineering<br />
Services, Hastings Deering, regarding the suitability of wheeled loaders for tyre<br />
handling activities. I have included his comments in Appendix 5. In <strong>summary</strong> he says<br />
that such equipment is not specifically designed for precision positioning particularly<br />
for Z bar and parallelogram type linkages. This is because the tilt cylinder and lift<br />
cylinder linkages are mechanically interconnected and the lift and tilt cylinder forces<br />
react against each other, largely independent of load but rather dependant on lift arm<br />
position and bucket orientation. In these cases larger tilt cylinder forces against their<br />
stops can induce reactive pressures in the lift cylinders above their relief. This may<br />
induce the lift arms to lower momentarily and have uncontrolled movement. Sites that<br />
use this style of equipment need to ensure that the risk from using wheeled loaders<br />
with such mechanical linkages during tyre fitting activities is acceptable.<br />
6.4.2 The practicality of some of the requirements of AS4457<br />
1) 3.2.3 Maximum pressure of 35kPa for tapered mounted rims. There is no<br />
one particular pressure that will suffice all situations. There is a variation<br />
between mine sites using identical tyre sizes in terms of the pressures<br />
identified in Standard Operating Procedures for handling them. Tyres should<br />
not be handled with pressure unless the integrity of the components is<br />
established. As stated above the large tyres, 40.00R57 and larger, cannot be<br />
managed well at 35kpa. (My comment: Ensure that your site has well developed<br />
procedures for these tasks built up on risk assessment process.) It is anticipated that<br />
the issues of tyre pressure will be engineered out through better-designed tyre<br />
handling equipment however I the interim the topic of maximum pressures is<br />
presently an issue.<br />
2) A9.1 A tyre which has been run flat or in a severely under inflated<br />
condition should not be fitted or inflated until the integrity of the tyre has<br />
been established. The integrity of the rim components must be established<br />
also. This comment needs to be included in A9.1. Tyres run at under 60% of<br />
normal inflation pressure should fall into this category also.<br />
3) A9.2 (b) Connect an air line with a clip on chuck and preferably inline<br />
pressure gauge to the valve assembly. The airline should also be long<br />
enough to allow the tyre servicemen to stand away from any exploding<br />
components. There should be a ‘T’ piece in the line, at a remote location,<br />
Tyre Fitters Workshop Townsville 2 Sep 2004: Minutes and Report. Author: Peter Power Page 6
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