查看更多>>摘要：While big mine trucks may grab many headlines, innovations further down the payload scale may have more of an impact on the mining industry as a whole. This is particularly true of the 216 tonne/240 short ton payload truck class but can also be seen in wheeled loader and excavator markets. As predicted by WME in early 2004, this hauler size range is seeing notable developments with the introduction of Caterpillar's 793D due later this year and Komatsu's 830E-AC, while Terex's TMT260-AC/MT4400AC is already available.
查看更多>>摘要：While big mine trucks may grab many headlines, innovations further down the payload scale may have more of an impact on the mining industry as a whole. This is particularly true of the 216 tonne/240 short ton payload truck class but can also be seen in wheeled loader and excavator markets. As predicted by WME in early 2004, this hauler size range is seeing notable developments with the introduction of Caterpillar's 793D due later this year and Komatsu's 830E-AC, while Terex's TMT260-AC/MT4400AC is already available. This truck category is extremely well proven and has been a popular choice with customers since the early 1990s, when Cat's 793 and the Haulpak 830E joined Wiseda's KL-2450 (now Liebherr's T262) on the market. Although the Ultra haulers have since topped the range in terms of capacity, reaching as high as 360 tonnes, the 216 tonne/240 short ton machines still dominate in terms of sales volumes. And these trucks have also been able to benefit from technology developed for the larger machines, such as the beefed-up mechanical drives in Caterpillar's 793D or the AC drives in Komatsu's latest 830E or Terex's MT4400AC.
查看更多>>摘要：Just in case anyone didn't notice, 2004 was a landmark year for the mining industry, with an explosion in demand for metals and coal, much of which was to meet the needs of booming Chinese industrial expansion and strengthening world economy. Orders virtually went through the roof, resulting in manufacturers scrambling for materials and components and tyres in particularly short supply. In 2004 even big financial investors remembered that the mining industry was important to the economy - heady times indeed. World Mining Equipment's upcoming equipment report, produced in partnership with the world leading specialist Parker Bay, will give a full analysis of what machines were shipped and to where. Here are some highlights.
查看更多>>摘要：Just in case anyone didn't notice, 2004 was a landmark year for the mining industry, with an explosion in demand for metals and coal, much of which was to meet the needs of booming Chinese industrial expansion and strengthening world economy. Orders virtually went through the roof, resulting in manufacturers scrambling for materials and components and tyres in particularly short supply. In 2004 even big financial investors remembered that the mining industry was important to the economy - heady times indeed. World Mining Equipment's upcoming equipment report, produced in partnership with the world leading specialist Parker Bay, will give a full analysis of what machines were shipped and to where. Here are some highlights. According to WME's figures, the number of off-highway trucks with individual payload capacities of 90 tonnes and greater that shipped in 2004 more than doubled the level of 2003. It's worth noting that 2003 was a weak year, the tail end of a five-year down cycle. Although there were indications that mining strengthened at the start of 2004 and that capital budgets would propel an increase in large truck orders, the intensity of demand surprised almost everyone connected with the mining equipment industry.
查看更多>>摘要：In many mining applications the focus is on using the biggest equipment available to provide economies of scale. However some operations profit from employing the sort of mid-size machines in production roles that are more commonly used for construction. The reasons for this approach may vary though. Mid-size machines can be useful at operations with difficult geology or where climate rules against larger items of equipment. The La Emilia mine operated by Mineria in Venezuela is running a fleet of JOB machines, using excavators and a wheeled loader for digging at the face and articulated trucks for haulage. This surface gold mine is in a remote location, some 1,300 km or so from the capital Caracas and around 514 hours by road from the nearest industrial town of Puerto Ordaz but the high gold content of the ores in this area makes it ripe territory for mining.
查看更多>>摘要：In many mining applications the focus is on using the biggest equipment available to provide economies of scale. However some operations profit from employing the sort of mid-size machines in production roles that are more commonly used for construction. The reasons for this approach may vary though. Mid-size machines can be useful at operations with difficult geology or where climate rules against larger items of equipment.
查看更多>>摘要：Crawler dozers play vital roles at many mining operations, whether dozing, pulling, pushing or ripping. Like other equipment sectors, new technology means that the latest dozers are more efficient, more productive and will take longer to wear their own tracks thin under hard use, representing a huge advance over the first crawler tractors of 100 years ago. The leaders in the dozer field, Caterpillar and Komatsu, both have improved models that benefit from new engine technology and better undercarriages, as well as a host of other more general upgrades. The two companies also continue to debate the relative merits of their very different track configurations, Cat's high drive and Komatsu's low drive. But both firms are making great strides and most noticeably in track life, a major issue with regard to dozer running costs, as well as in making their machines easier and more comfortable to use.
查看更多>>摘要：Crawler dozers play vital roles at many mining operations, whether dozing, pulling, pushing or ripping. Like other equipment sectors, new technology means that the latest dozers are more efficient, more productive and will take longer to wear their own tracks thin under hard use, representing a huge advance over the first crawler tractors of 100 years ago. The leaders in the dozer field, Caterpillar and Komatsu, both have improved models that benefit from new engine technology and better undercarriages, as well as a host of other more general upgrades. The two companies also continue to debate the relative merits of their very different track configurations, Cat's high drive and Komatsu's low drive. But both firms are making great strides and most noticeably in track life, a major issue with regard to dozer running costs, as well as in making their machines easier and more comfortable to use.
查看更多>>摘要：The latest technological developments mean that crushing and screening equipment produces more and requires less maintenance. Better wear materials in key areas, optimised design and long-life components are boosting performance, cutting downtime and reducing running costs. Further gains come from smart systems that can cope with tough operating conditions and on-line monitoring, which offers greater reliability.
查看更多>>摘要：The latest technological developments mean that crushing and D screening equipment produces more and requires less maintenance. Better wear materials in key areas, optimised design and long-life components are boosting performance, cutting downtime and reducing running costs. Further gains come from smart systems that can cope with tough operating conditions and on-line monitoring, which offers greater reliability. German firm Haver & Boecker is improving its line of NIAGARA screens by fitting an effective oil lubrication system for the bearings that is matched to the application. The firm's double shaft drive, free swinger drive and eccentric drive screens previously featured conventional grease lubricated bearings but the firm is now offering either recirculat-ing oil lubrication or oil level lubrication right across the NIAGARA range. The first machine in the line-up with oil lubrication was the Free-Line MD 1800 6000 unit introduced in early 2004 and the success of this model has prompted the firm to extend the feature throughout the range. The MD 1800 X 6000 has a pump to feed bearings with oil, which then flows back through a return pipe into the tank. The lubrication system is compact and consists of tank, pump, filter and a monitoring unit that checks pressures and temperatures constantly. A heater allows the screen to stop at low temperatures and start again without problems. The monitoring system detects operating problems, preventing costly repairs.
NSTL