Large sand box for casting wind power equipment parts

The utility model discloses a large sand box for casting wind power equipment parts. The device comprises an extension block and a sand box, extending blocks are connected to the end surfaces of the front end and the rear end of the sand box; connecting plates are connected to the end surfaces of the left end and the right end of the sand box; the middle of the connecting plate is connected with alimiting plate through a bolt; the sand box consists of an upper fixing plate, a box body, reinforcing ribs and a lower fixing plate, the outer rubber pads and the inner rubber pads on the surfaces of the upper fixing plate and the lower fixing plate can well prevent engineering sand from leaking out; meanwhile, the inner rubber pad can be well clamped into the surface of the outer rubber pad, sothat the distance between the sand boxes is prevented from being increased due to mutual extrusion of cushion blocks in the middle of the sand boxes; the limiting plate can be well connected with theconnecting plate, so that