Gravel crushing production line process

The invention provides a sandstone crushing production line process which comprises the following steps: after separating molding sand from a casting, putting the molding sand into a jaw crusher for primary crushing; the molding sand subjected to primary crushing is fed into a bucket elevator through a conveying belt; the bucket elevator lifts the molding sand into a first-stage sand bin for storage; the molding sand in the primary sand bin is uniformly distributed to a secondary crusher by a feeding machine; fine crushing is conducted on the molding sand conveyed by the feeding machine through a secondary crusher, and fine sand is obtained; fine sand is subjected to impurity screening through a screening machine; the fine sand is lifted to a secondary sand bin to be stored; the fine sand is quantitatively added into a regeneration disc; dust generated in the regeneration process is removed by a dust suction device; cooling the fine sand heated in the regeneration process; the regenerated fine sand is lifted