Coal Age

JUN 2019

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28 June 2019 shovels and excavators Primary Loading Tool Advancements New models and systems could improve productivity Moving more rock and coal safely is the key to success for any surface mining operation. Two of the original equipment manufacturers (OEMs) that design and build hydraulic shov- els, Hitachi and Liebherr, made major announcements recently. In addition to those announcements, Cat has de- veloped a new snubber for rope shov- els and a hydraulic hose supplier has developed a new system for hump hose replacement. What follows is a summary of those announcements. Hitachi Adds Another EX-7 At bauma in April, Hitachi unveiled the EX1200-7 mining excavator for the first time. The EX1200-7, which is expected to provide increased ef- ficiency, reliability and durability for customers, is the third machine in Hi- tachi's new EX-7 series lineup, follow- ing the recent launch of the EX2600- 7 and EX5600-7 (See April Coal Age, Product News, p. 42). "Available in a backhoe or shovel configuration, the EX1200-7 is our smallest mining excavator and also serves as a crossover machine for construction customers," said Bri- an Mace, mining product marketing and applications manager, Hitachi Construction Machinery–Americas. "This versatile machine delivers an astounding combination of power and the latest technologies you need to get the job done, whether its large- scale excavation or mining." Thanks to Hitachi's Fuel Consump- tion Optimization (FCO) technologies, the EX1200-7 improves total fuel econ- omy by 6% as compared to the previous model (the EX1200-6) through engine and hydraulic system improvements. The EX1200-7 features a fuel-efficient Cummins EPA Final Tier 4 engine with DEF. For non-regulated countries, a Cummins engine featuring fuel-cal- ibration optimization settings helps contribute to improved efficiency. Ad- ditionally, when the machine is in neu- tral, auto-idle reduces engine speed to save on fuel consumption. The new EX1200-7 also features a 4.5% increase in bucket capacity with a 7-m 3 (9.2 cu yd) capacity. Equipped with optimized swing control, the new machine also has an improved hydraulic system with a flow regener- ation valve to reduce power require- ments from the hydraulic system and engine, lowering fuel consumption and improving pump life. The undercarriage on the EX1200- 7 has three single-sided upper rollers on each side of the track frame that help maintain track shoe clearance and reduce debris buildup. Addition- ally, the boom and arm are welded, using a full-box section design to evenly distribute stress and provide ease of maintenance. The under- slung low-bend configuration of the front-attachment hoses removes the need for clamping to help reduce chafing and increase reliability. A new option with the machine is the auto-lubrication system for a bulk-excavation front attachment, which supplies grease to the super- structure including bucket pins. The advanced system comes redesigned with a large-capacity grease tank, new grease pump, in-line grease filter and breather with filter, resulting in a more reliable system with less downtime. A pressurized cab with air condi- tioning helps overcome environmen- tal extremes, and the operator seat was specifically designed for the mining industry with a weight-adjusting cush- ioned seat that allows the operator to customize suspensions settings. A large, multifunctional display provides key machine information that is fit- ted with an LED backlight to improve clarity and reduce reflective glare. An optional sun visor and roll screen also help provide maximum comfort. The EX1200-7 also provides the option of Aerial Angle, which is pop- ular among customers and works as a 360° vision system. The system assists with noting equipment surround- ings through a display monitor that combines a set of images captured by The new EX1200-7 comes equipped with optimized swing control.

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