Modern Mining November 2015

PRODUCT News

Faster, safer tyre change-outs with Cat wheel rims

cal panel itself. This means that the panel can be smaller or, where necessary, more components can be included in the panel. Engineered to withstand harsh operating conditions, the motor protection circuit breakers are robustly constructed for opti­ mal reliability. The range facilitates the protection of a wide range of electricmotors from0,16 A up to 100 A. Significantly, the WEG MPW range has both thermal magnetic versions which provide protection against any potential short circuit and overload conditions and Caterpillar’s Quick Change Rim (QCR) system has reportedly revolutionised this practice and greatly contributed to improved production efficiencies by reduc­ ing change-out times to around two hours, due to fewer rim base removal and instal­ lation procedures. As a result, the system is proving particularly popular with large and ultra size mining truck fleet owners. Key models using QCRs include the Cat 785C, brakes and tyres,” explains Barloworld Equipment Senior Product Manager Wally Parsons. “This is why tyre selection and fitment is such an important part of the overall production planning on any mine.” (Barloworld Equipment is Caterpillar’s Southern African dealer.) Tyre removal and installation is a specialised area. It can also be a time con­ suming exercise when using standard rim configurations. Traditionally, the only way to change the rear axle inside tyres on a mining truck has been to remove the entire outside tyre and associated rim systems. On average, this process takes between six and seven hours to complete by a well-trained team.

magnetic only versions which provide pro­ tection against short circuits. Use of the thermal magnetic device will reduce the number of components required when manufacturing a motor control centre and this can translate into a significant cost saving. The magnetic-only version allows the use of electronic overload protection devices which can reduce costs further. This motor protection circuit breaker is available with a full range of accessories including auxiliary contacts, shunt trips, under voltage releases, door mounting handles and free standing enclosures. Zest WEG Group, tel (+27 11) 723-6000 “The lock ring is a single piece design,” explains Parsons. “It’s made with spe­ cially designed materials that allow it to be expanded for easier attachment and removal. Compared with other aftermar­ ket quick change rim systems, it’s the only one that is interchangeable between all six tyre positions.” Barloworld Equipment, tel (+27 11) 929-0000 Cat 785D, Cat 789D, Cat 793D and F, Cat 795F, as well as the range-topping Cat 797F. The QCR system has a position specific outer rear rimwith separate dual bead seat bands and flanges. These components allow the tyre and rim components from the inner rear rim to slide over the outer rear rim. The key factor here is that the sys­ tem allows the inner and outer tyres to be removed and replaced without having to remove the rear axle outside rims. The back section of the QCR base is modified to include additional lock ring and O-ring grooves for a second bead seat band, which allows the tyre to be removed without the need for a hydraulic bead breaker tool to separate the inner tyre bead from the rim base.

Caterpillar’s QCR system provides longer rim life, im- proved safety, and reduced tyre maintenance time.

Designed and built to strict Caterpillar specifications, Cat wheel rims help ensure better drive train performance and extended component life in off-highway trucks by combining the highest level of strength with the minimum amount of weight to maximise payload and decrease fuel costs. “By functioning as an integral part of Cat drive train systems, these rims help extend the life of all power transmitting compo­ nents, as well as the suspension, bearings,

Two models added to circuit breaker line-up The addition of two new models to the WEG MPW range of motor protection cir­ cuit breakers will offer customers a broader range fromwhich to select the most appro­ priate protection for electric motors. All motor protection circuit breakers in the range are manufactured in accordance with IEC 60947 and UL 508 international stan­ dards, giving absolute assurance in terms of operational parameters and quality.

These devices offer the major ben­ efit of being compact and modular, which allows space saving within the electri­

Index to advertisers AEL Mining Services OBC Afrimat 13 Air Liquide 57 Allied Crane Hire 7 Bara Consulting 40 Barloworld Equipment 53 Barloworld Power 24 Beka Schréder 38 Bell Equipment Company IFC Brelko Conveyor Products 58

Multotec Group

46 17 32 51 44 26

DRA Projects SA Flexicon Africa

30-31

11

PANalytical

FLSmidth

2

Simantel

Joy Global Africa

41 55 27

Torre Lifting Solutions

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Liviero Group

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Veyance Technologies SA

15

WorleyParsons Zest WEG Group

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MMD Mineral Sizing

59

60  MODERN MINING  November 2015