Sliding block forced demolding mechanism for upper cover of water tank, sliding block and mold

The utility model relates to a sliding block forced demolding mechanism for an upper cover of a water tank, a sliding block and a mold. The sliding block forced demolding mechanism comprises an insert pressing plate, a sliding block insert and an elastic piece, the insert pressing plate is located at the rear end of the sliding block, and a sliding groove is formed in the insert pressing plate. The sliding block insert is arranged in the sliding block, one end of the sliding block insert is used for extending into the inverted buckling part of the water tank upper cover, and the other end of the sliding block insert penetrates through the sliding groove to be movably connected with the insert pressing plate; the elastic piece is installed in the containing cavity of the sliding block, the sliding block insert is sleeved with the elastic piece, and the elastic piece is used for enabling the sliding block insert to move in the direction away from the water tank upper cover so that the sliding block insert can b