1. Before sand mixing, check whether the working conditions of the sand mixer, sand treatment and other equipment are correct.
Usually, after each start, it must be idling for 2 minutes before feeding
2. Molding sand ratio.
3. Timing and sequence of feeding: pulverized coal, bentonite and new sand should be indicated according to the signal at the sand mixer; when the stock in the sand bin is below the warning line, it should be replenished immediately.
4. Mixed milling process: reclaimed sand, fresh sand, and water are mixed for 3-5 seconds and then bentonite and coal powder are added. The mixing time is 2min for every 750kg sand.
5. Performance requirements of molding sand.
6. The molding sand test shall check the molding sand every 30 minutes. The tester shall make a record and notify the sand mixer. The sand mixer should make adjustments based on the unqualified items in the molding sand test report and make a record.
7. Routine inspection items of molding sand test: moisture, wet compressive strength, air permeability, compaction rate, and the effective content of bentonite and mud content shall be tested once a week.
8. Before leaving work every day, the following work should be done: ①Unload all the molding sand in the sand machine; ②Clean the machine plate, especially the sand outlet, and ensure that it can be opened and closed flexibly; ③Close the sand mixer work door; ④ Close the gas circuit switch; ⑤Close the circuit switch.