Dynapac’s IMIX system ensures homogeneous material transfer for asphalt paving
Dynapac has launched the IMIX system for asphalt paving, eliminating temperature and material segregation. The company demonstrated the IMIX technology along with its MF2500CS material transfer vehicle (MTV) at CONEXPO 2020.
The heart of the IMIX-system is the combination of three devices: conical auger in the hopper, a flow divider in the conveyor and a mixing system at the end of the main conveyor.
Segregation occurs during loading, transport and dumping. The larger materials tends to move to the outer sections and smaller material settles in the middle of the material flow.
The augers in the hopper pushes the large particles, which are stagnant at the colder outer sections on the material hopper towards the middle of the conveyor to join the main flow. The material in transported by the movement of the belt to the top, where the flow of material is split by a flow divider into two streams, these streams of material are mixed and blended at the end of the conveyor by an auger mixing system before leaving the main conveyor. This arrangement equalizes temperatures within the mix and blends large and small stones. This ensures homogenous and long lasting road quality. For cold material like RCC the conveyor mixing system can be lifted by pressing a button. This ensures a higher material output.
Maintaining a safe distance between the material feeder and paver while docking to the truck to the feeder and paver simultaneously can be daunting task. To enable this, the Dynapac DistanceAssist feature automatically maintains a set distance between the paver and feeder. The feeder is equipped with a laser sensor which enables the feeder operator to virtually connect to the paver and follow the speed of the paver movement and focus on the job at hand which is material transfer. Combined with the possibility to save multiple distances, feeding two pavers in echelon becomes less stressful with the Dynapac MF2500CS and SwingApp.
To keep the paver operator informed, the feeder is equipped with an LED-Bar, which shows the status of the radar sensor and the deviation to the correct distance. Together with an acoustic warning concept, the DistanceAssist features ensures a safe feeder jobsite.
Feeding two pavers simultaneous is often demanding for the feeder operator. The Dynapac SwingAssist feature saves the SwingApp height and angle of swing at both the paver’s location, and the operator can recall the positions. In combination with DistanceAssist, the feeder drives automatically to the correct position and the SwingApp moves directly over the hopper of the paver.
The MF2500CS featured at the CONEXPO 2020 show was equipped with the 3 ft. extended SW6500 SwingApp conveyor for long side reach for paving over barriers and in-line or echelon paving applications.
The newly developed 28ft long conveyor SW6500 has a side reach of 12.5 ft. Thanks to its integrated quick coupling cylinders and lifting points the SW6500 can be mounted behind any MF2500CS within 20 min. This reduces investment cost for the contractors using one swing app for multiple machines in their fleet. This patented system reduces wearing and makes the MF2500CS a highly flexible machine.
The durable feeder rubber belt is mounted directly on metal stiffeners. This concept allows longer intervals for belt changes and a higher planning reliability. For longer uptime, the rubber belt connection has been optimized; extensive testing in varying conditions with various mixes has verified the higher stability. The newly positioned spraying beam under the front hopper flap guarantees a permanent wet feeder belt. This prevents adhesion with difficult mixes and weather conditions. The new dual scraper for the SwingApp is robust and removes persistent adhesions, eliminating the possibilities of bitumen wires or material sticking. The pressure of the scraper, spraying interval and period can be adjusted individually according to site requirements. This lowers wearing and usage.
The feeder belt is held in place by chain rollers; thus, no chains have to be dismantled when changing the belt. The new belt is attached to the old one with the quick coupling system and fed in place. This design makes a feeder belt change possible within a couple of hours. Further, no vulcanization is needed and the belt is immediately ready for action. For unexpected damages due to external influences, Dynapac offers feeder belt repair kits to replace the damaged area.
The Dynapac MF2500CS is the only MTV on the market that can be used for transferring variety of materials such as asphalt, RCC, aggregate and sand. The precise belt control and the foldable material hopper as well as the optional rubber skirt enable the transported material to be fed precisely. The MTV has a large feeding capacity of up to 4,000 tons per hour and large paving widths to support special applications such as landfilling.
The feeder has an optimized cleaning system with three separate pumps, an enlarged release agent hose and hose connections in front and in the back of the machine to counteract material sticking to the feeder. This minimises cleaning time at the end of the day.
Dynapac’s belt concept is long lasting because its development is based on hot mix material; thus, wear repairs and belt changes can be planned easily. With DynaLink the feeder can be monitored to schedule service and maintenance.
The MF2500CS MTV has a hydraulic liftable platform which elevates the operator area about four feet with a touch of a button, and it provides a 360-degree job site view. The TruckAssist feature makes truck docking/un-docking to the feeder simple and efficient. A series of LED bar lights signal the truck driver when to back up, dump the material and when to leave. The light sequences are controlled by the feeder operator.
A 7” screen in the MF2500CS displays vital feeder parameters including the amount of material in the paver hopper bin, auto belt feed control etc. Three cameras allow the operator to see the front and rear of the feeder and the paver hopper area providing optimal visibility around the feeder at all times. The multi-function joystick allows the operator to control the travel and feeding functions without leaning forward and touching the dashboard. Heated comfort seats and weather protection cab enhance operator comfort.