Method and device for regenerating casting sand of lost foam casting production line

Abstract

The invention relates to the technical field of lost foam casting, and discloses a method and a device for regenerating casting sand of a lost foam casting production line. The device for regenerating casting sand comprises a sand falling and filling system, a dust removal cooling system, a sand selecting system, a sand conveyer system, a center sand bin, a middle sand bin, a control system and a dust removal system. The method for regenerating casting sand comprises the following steps: carrying out casting sand cleaning, dusting and cooling, sand selecting, and sand filling for molding on to-be-processed casting sand used in a casting procedure so as to obtain the regenerated casting sand. The method and the device are suitable for the lost foam casting production line with treasure sand as casting sand; the dust removal cooling system is compact in structure and high in cooling efficiency and has an energy-saving effect; the operations of sand falling and sand filling procedures are integrated into a system, so that the running efficiency of the system is obviously improved, and interference and restriction formed when the procedures cannot be synchronously performed are avoided.

Description

technical field [0001] The invention relates to the technical field of lost foam casting, in particular to a method and device for regenerating lost model sand. Background technique [0002] In the foundry industry, lost foam is one of the emerging and most advanced casting processes, and it has many different names. The main names in China are "dry sand solid mold casting", "negative pressure solid mold casting", or EPC casting for short. [0003] The process of lost foam casting is usually to bond and combine paraffin or foam models similar in size and shape to castings to form a model, after brushing refractory paint and drying, the model is placed in a sand box, and then filled with dry sand for vibration molding, and finally Pouring under negative pressure makes the model vaporize, the liquid metal occupies the position of the model, solidifies and cools to form a casting, and after the casting is taken out of the sand mold, the entire sand mold becomes scattered sand ...

AI Technical Summary

Problems solved by technology

Therefore, the lost foam casting process without a sand treatment system is difficult to show the characteristics of the excellent production environment of the lost foam casting and ensure the stability of product quality

[0008] There are usually three ways to cool the hot sand in the foundry industry. One is to put the hot sand in the designated place to dry naturally and let the hot sand cool down naturally. This method cools down very slowly, so a large amount of dry sand is required in the entire lost foam process. Turnover, and drying the hot sand also requires a certain area of ​​space, resulting in higher production costs; the second is air cooling, that is, placing the hot sand on specific equipment, ventilating the equipment, and taking away the heat of the hot sand, this method cools down The speed is also relatively slow, and a large amount of dust will be generated to pollute the air, resulting in a very bad working environment; the third is to cool the hot sand through the heat exchange device. The current heat exchange device usually includes a drum that rotates around its own axis. The axis of the drum is usually horizontal or close to the horizontal. The hot sand enters from one end of the drum and flows out from the other end. There is a water spray pipe on the top of the drum. The water spray pipe sprays water on the outer surface of the drum to absorb the heat of the drum. Cool the hot sand in the drum, but the cooling efficiency of the current heat exchange device for the hot sand is usually relatively low, and the weight of the drum and the hot sand is relatively heavy, so driving the drum to rotate requires a lot of power, resulting in energy loss during use. The consumption is relatively high, and part of the water is sprinkled on the surface of the drum to form steam, and the liquid water is sprinkled around the drum, resulting in a poor working environment. These cooling methods for the hot sand completely waste the huge heat included in the hot sand. not being used effectively

[0009] In the lost foam casting system, the fluidized bed cooling device is often used to cool the molding sand. For example, a lost foam sand treatment system is mentioned in the domestic published patent 201210380959.3. The vibrating conveying trough and the belt suspension magnetic separator on the rear side of the sand machine, the heat-resistant bucket elevator located on the rear side of the vibrating conveying trough and the belt-type suspended magnetic separator, and the heat-resistant bucket elevator located in the middle of the two The sand storehouse, the fluidized bed cooling ash removal device installed on the rear side of the middle sand storehouse, the transitional sand hopper located on the rear side of the ash removal device, the pneumatic conveying device arranged on the rear side of the transitional sand hopper, and the pneumatic conveying device installed on the rear side of the pneumatic conveying device There are two sand hoppers above the vibrating table, and a rain-type sand adding machine is installed on the rear side of the sand hopper above the vibrating table. The cooling and ash removal device in the treatment system scheme uses a fluidized bed cooling device, which has the following obvious deficiencies① High energy consumption, ② large volume, occupying a large area and space, ③ poor cooling effect and large water consumption, because the cooling pipeline is outside the shell, the boiling sand cannot directly contact with the cooling pipeline, which reduces the conduction and heat transfer efficiency, ④ adaptation The range is narrow, not completely suitable for high-density pearl sand and other molding sand

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