Vibration applications for Casting
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Moulds cooling.
Sand scrap cores (usually in a single piece) are cooled in the tumbling drum, the lumps are knocked out and the castings and the sand temperature decreases.
Sand is extracted by the drum lower part, through a perforated plate, to collect and treat it.
At the outlet of the drum, a temperature is guaranteed in order to be able to handle the castings, to de-gate them.
The cooling in the drum is made through a forced convection, with a continuous controlled water addition, depending on the temperature and the weight of the pieces.
When an additional cooling is required, the shake conveyor may be installed, allowing section to act in a pulmonary manner. In spite of bearing considerable loads, of up to 25 tons, the unit can start up again without any problem.
The castings to be handled are transported by sliding and not by micro-projection (as in vibrating conveyors). The castings therefore do not suffer damage which might otherwise be produced by possible impacts.
The tray receives an alternative rectilinear movement of a pneumatic actuator. This makes it ascend by means of the roller tracks with some soleplates, accumulating a potential energy. In the descent of the tray, the aforementioned energy is transformed into kinetic energy, reaching the design speed. The tray is braked roughly by two stops. This impact causes a sliding of the material accumulated on the tray.
The advance speed of the material can be regulated through the control of the magnitude of the impact. Two detectors are in charge of controlling, automatically, the position of the tray, regulating the speed. In this way some extremely slow advance speeds, of 1 m/min or even less, are obtained.
The electronic control of the machine makes it possible for the production to be transported to be variable, maintaining a stable advance speed of material. The electronic pressure regulator adjusts the work pressure to the needs of the conveyor.
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