The Double-spiral-belt Concrete Mixer JSS500~4000 is one of our company’s new product. Its design is based on Germany technology and combines our company’s new shaft end sealing technique paten (Paten No.: ZL2007 2 009871.2). This new design machine has many advantages, high mixing efficiency, well mixing evenness, low noise, less power consumption, nice sealing, reasonable structure design, easy maintenance and long working service.