Variable-screw pitch salt mining conveyer

The utility model relates to a variable-screw pitch salt mining conveyer which comprises a spiral shaft, a mining blade and bearing supports, wherein two ends of the spiral shaft are fixedly connected with the bearing supports respectively; the mining blade is wound on the circumference of the spiral shaft spirally; the screw pitches of the mining blade become larger and larger from two ends of the spiral shaft to the middle of the spiral shaft, that is, the screw pitch of the middle of the mining blade is largest while the screw pitches of the two ends of the mining blade are smallest; saw-toothed excavating teeth are formed in the outer edge of the mining blade. The variable-screw pitch salt mining conveyer has the advantages that the functions of mining and conveying are integrated; a cutting function is achieved to a certain extent; the degree of automation of a salt miner is higher; the working performance is reliable; the structure is simple.