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www.rockproducts.com ROCK products • May 2016 • 29 For the optional S version with secondary screen mounted, the oversize gradation return conveyor has been redesigned from the predecessor models, eliminating a vertical bend and integrating the transfer chute at the feed hopper. With these new Mobirex impact crushers, the fully hydrau- lic adjustment capability of the crushing gap permits greater plant uptime, while improving quality of end product. Not only can the crushing gap be completely adjusted via the touchpanel electronic control unit, but the calculation of the zero-point is possible while the rotor is running. This ability to accurately set the crusher aprons from the control panel with automatic detection of zero point and target value set- ting saves time, and improves the overall efficiency and han- dling of the crusher. In a Kleemann Mobirex impact crusher, the zero point is the distance between the ledges of the rotor and the impact plates of the lower impact toggle, plus a defined safety dis- tance. The desired crushing gap is approached from this zero point. While the upper impact toggle is adjusted via simple hydrau- lic cylinders, the lower impact toggle has a hydraulic crush- ing gap adjustment device, which is secured electronically and mechanically against collision with the rotor. The crush- ing gap is set via the touch screen and approached hydrau- lically. Prior to setting of the crushing gap, the zero point is determined automatically. For automatic zero-point determination, with the rotor run- ning, the impact toggle moves slowly onto the rotor ledges until it makes contact, which is detected by a sensor. The impact toggle is then retracted by the defined safety distance. During this procedure, a stop ring slides on the piston rod. When the zero point is reached, the locking chamber is locked hydraulically and the stop ring is fixed in position. The stop ring now serves as a mechanical detent for the piston rod. During the stop ring check, which is carried out for every crusher restart, the saved zero point is compared with the actual value via the electronic limit switch. If the value devi- ates, a zero-point determination is carried out once again. Kleemann, www.kleemann.info KPI-JCI and Astec Mobile Screens made improvements to its FT4250 t ra c k- m o u n te d i m p a c to r p l a n t to enhance ease-of-use, performance and productivity. The new FT4250 features a 42- x 50-in. A n d re a s H o r i z o n t a l S h a f t I m p a c t Crusher fitted with a class-leading 6- x 12-ft. double-deck screen, resulting in up to 30 percent more uptime and 25 percent more production than compet- itive models, according to KPI-JCI and Astec Mobile Screens. The improved model offers a new, one- piece return conveyor design, as well as improved access to clean the radia- tor, improved transition from the cross conveyor, and a deep trough and cov- ers to avoid spillage. A new hydraulic apron system allows for easier adjust- ment of upper and lower aprons, as well as quicker system calibration. The upgraded hydraulic system – which includes switching to Danfoss H1 pumps – provides increased crusher performance and output, according to Stephen Whyte, product manager for KPI-JCI and Astec Mobile Screens. The new model also incorporates a new 7-in., touchscreen Digsy controller, which allows for easier programming updates on site. Updates can be down- loaded onto a USB drive and insert- ed into the front of the panel without requiring a laptop or cable. The FT4250 track-mounted impac- tor plant is well-suited for a variety of applications, including recycle, demoli- tion, aggregate and quarry, Whyte said. "Many of our customers are moving their units quite frequently from site to site, and the FT4250 makes this pro- cess much easier," Whyte said. "Set-up time is very quick, and the unit can be easily configured to suit a wide range of applications with the option of three- or four-blow bar configurations and choice of blow bar materials, making it a versatile, high-performing option." KPI-JCI and Astec Mobile Screens, www.kpijci.com KPI-JCI, Astec Mobile Screens Offers FT4250 Improvements