En Portada | Cover Story FuturEnviro | Marzo/Abril March/April 2020 www.futurenviro.es 6 Cuando Josef y Wernner Doppstadt empezaron a desarrollar su “primer triturador primario”, hace más de 25 años, tenían clara una visión: construir el mejor “destrozatodo” del mundo. Frente a la idea de la mayoría, de copiar diseños basados en conceptos “chatarreros”, de dos ejes y monstruosas potencias (y consumos, y desgastes…) apostaron por un concepto radicalmente diferente. Una máquina de un eje, que no se detuviera frente a nada. Que concentrara toda su fuerza en un único rotor, y que sacara el máximo rendimiento a cada gota de combustible. Que evitara una transmisión hidráulica, con las pérdidas de hasta el 30% de potencia, y en su lugar recurriera al acoplamiento directo. Que no desperdiciara cantidades ingentes de energía disipando toda la inercia acumulada cada vez que unmaterial exigente le obligaba a detenerse, o incluso invertir el giro. Que no se dedicara a girar en vacío si un elemento plano, o con pocos bordes, o con poca densidad, llegaba al compartimento de trituración. Que no dejara al material “flotar” sobre su borde de ataque, y fuera muy, muy agresivo en la alimentación. Que pudiera con casi cualquier material, menos chatarra y piedra. Estos materiales llevan siglos triturándose. No es que ya estuviera todo inventado, pero lo cierto es que los principios de trabajo de fragmentadoras, mandíbulas, impactores, conos… eran bien conocidos, y muy, muy optimizados. La visión era otra. Aquí el material es diferente. Mucho más variable. Porque si algo se aprende cuando se trabaja con biomasa, pero sobre todo, con residuos, es que el material es muy cambiante. La herramienta adecuada debe ser capaz de adaptarse. Si algo muy duro, un intriturable, llega al compartimento de trituración, ¿Qué será mejor, pelearse con él, desgastando y gastando, o abrirle un camino Josef andWernner Doppstadt had a clear vision when they began to develop their “first preshredder”more than 25 years ago: to build the world’s best “all-in-one destroyer”. Unlike the vision of the majority, which was to copy designs based on “scrapyard” concepts using two shafts and enormous power (and consumption and wear…), they opted for a radically different concept. A single-shaft shredder that would deal with anything thrown at it. A shredder that would concentrate all its power into a single rotor and would squeeze the maximum performance from each drop of fuel. A machine that would shun hydraulic transmission, and its power losses of up to 30%, in favour of a direct drive. A machine that would not waste huge quantities of energy by dissipating all the accumulated inertia every time a demanding material forced it to stop, or even change the direction of rotation. A machine that would not rotate into empty space if a flat element or an element with few edges or low density entered the shredding chamber. A machine that would not allow material to “float” over its leading edge and one that would be very aggressive with respect to material input. A shredder that could cope with almost any material, apart from scrap metal and stone. These materials have been shredded for many years. It is not as if everything had already been invented but it is true that the working principles of shredders, and jaw, impact and cone crushers…had been well-documented and very much optimised. The vision lay elsewhere. Here the material is different and far more variable. If there is one thing to be learnt fromworking with biomass, and above all with waste, it is that the material is very variable. The appropriate tool needs to be adaptable. If something very hard and unshreddable reaches the shredding chamber, what is the best option? To fight with it, resulting in wear and waste, or to open up a way for it to leave? The concept of the shredding comb began to make sense. Not to mention wear.Wear is inherent to materials. Of that there is no doubt. But it is also a fact that not all equipment behaves in the same way. The appropriate tool should avail to the utmost of every gram of wear. But it should also be simple, economical and rapidly replaceable. Onsite soldering is not the best option to deal with frequent wear and even less so for equipment that DOPPSTADT AND HJM; A RE-EVOLUTION IN SHREDDING After 25 years of being the benchmark pre-shredder, the Doppstadt DWmakes way for two newmachines, each poised to set the bar higher in their respective classes. DOPPSTADT Y HJM; RE-EVOLUCIONANDO LA TRITURACIÓN Después de 25 años siendo el triturador primario de referencia, la DWde Doppstadt deja paso a dos nuevos equipos destinados a subir el listón, cada uno en su categoría. HJM - Hispano Japonesa de Maquinaria HJMNorte Polígono Industrial del Bierzo Alto, E3-E4, 24318 San Román de Bembibre (León) HJM Centro Avenida Lyon 1 19200 Azuqueca de Henares (Guadalajara) T. +34 902 210 350 HJM Atlántica PI Espíritu Santo, Rúa Bell 19 15650 Cambre (A Coruña) +34 981 92 32 83 HJM Andalucía C/ Picasso González, 1 291409 Churriana (Málaga) +34 952 62 12 50 info@hjm.eu www.hjm.eu
RkJQdWJsaXNoZXIy Njg1MjYx