Roller mill

A roller mill, comprising:

• a shell provided with a feed port and a discharge port;
• a main shaft inserted in the shell and rotatable in the shell;
• a drive device drivingly connected to the main shaft;
• a holder mounted on the main shaft;
• two or more than two grinding rollers, each of the grinding rollers mounted on the holder and rotatable around its own axis;
• and
• a grinding disk fixedly mounted in the shell at a position opposite to the two or more than two grinding rollers,
• wherein, the roller mill further comprises:
• an axial position adjustment device connected to the main shaft and configured to drive the main shaft to move axially to adjust a position of the main shaft
• wherein the shell comprises a cover, a first shell, and a second shell, and wherein the cover, the first shell, and the second shell are connected and arranged from top to bottom in the listed sequence, the feed port is provided in the cover and the discharge port is provided in the second shell;
• and
• the two or more than two grinding rollers have a conical shape, and the grinding disk is fixedly mounted on the second shell and is inclined relative to a horizontal plane;
• and
• wherein the axial position adjustment device is a hydraulic cylinder, the hydraulic cylinder is arranged along a vertical direction, and comprises a cylinder body, a piston rod, and a piston, the cylinder body is fixedly arranged, and the piston divides an inner cavity of the cylinder body into an upper cavity and a lower cavity, and the piston rod is movably connected to the main shaft via the drive device and is configured to drive the main shaft to move axially to adjust the position of the main shaft;
• and
• the piston rod is not rotatable and the main shaft is rotatable.