How to choose resin sand production line is becoming more and more popular because of its high dimensional accuracy and good surface finish. But the production enterprises of resin sand treatment production line are mixed. Take the production line with an annual output of 3000 tons of castings as an example: to mix 1 ton of sand with 1 kg of resin, the enterprise will waste 100000 yuan. The quality of reclaimed sand is an important standard to evaluate the quality of resin sand treatment production line. It includes loss on ignition, film removal rate, micro powder content, sand angle coefficient and so on. The used sand shall be recycled through the processes of iron removal, crushing, membrane removal, screening, micro powder removal, etc. Each process has strict technical standards, which will directly affect the quality of reclaimed sand.
First, crushing: the friction force of the grid plate is affected by the weight of the sand block and the impact force of the vibration motor. The manufacturer shall provide detailed data to ensure that the grid plate rubbing force is less than the gravel impact resistance. Otherwise, the sand gravel will be easily broken and refined, which will reduce the recovery rate of used sand and increase the production cost. From the microcosmic point of view, the increase of the angle coefficient of sand (the best ball shape) will increase the surface area of sand, increase the amount of resin, and reduce the permeability of molding sand.
Second, stripping: the resin film close to the 500 degree range of casting in sand mold will be burnt and burnt. The existence of burnt film affects the strength of sand mold, wastes a lot of resin and must be completely removed. However, the resin film wrapped on the surface of sand can not only reduce the amount of resin, but also increase the yield of sand mold, which can not be removed. The defoaming equipment uses the impact force to make the burnt film fall off, and the impact force must be less than the impact force of gravel. The manufacturer has the obligation to help the foundry to determine the reasonable sand iron ratio, so that the defoaming rate is ≥ 26%, and the burning loss is ≤ 4%.