GB698085A - Improved regulator for roller-mills - Google Patents

Abstract

698,085. Roller mills. BUHLER, GEB. April 12, 1950 [April 14, 1949], No. 9026/50. Class 59 [Also in Groups XXIX and XXX] A regulator for roller grinding mills comprises a piston 11, Fig. 2, for moving a roller 2 relative to a roller 3, and a piston 18 for controlling a feed gate 15 at the cutlet of a feed hopper 14. A device 22 detecting the amount of material flowing into the hopper actuates a valve 20<SP>1</SP> controlling an exhaust port 18<SP>1</SP> in the piston 18. Pressure fluid is supplied by a pump 23 through lines 25, 34, chamber 26, line 29 to the space above the piston, and when the valve 20 is urged downwardly, pressure bulids up in the space and the chamber 26 to move a piston valve 27 to connect the line 25 to the cylinder 12 containing piston 11. The dimensions of piston 18 and spring 24 are so arranged that the piston 11 moves before the piston 18. If the pressure fluid is compressed air, a whistle 37 is connected to the return line 35 and when the valve 27 is urged to its lower position due to lack of material in the hopper, an audible warning is given. The feed rollers 4, 5 are moved into and out of gear mechanically in dependance on the position of the movable grinding roller. A cock 29a in the line 29, when closed, causes the grinding rollers to be engaged and feed rollers to be moved into gear whereby the hopper may be completely emptied through the narrow gap between the gate 15 and roller 4, which gap is present when the gate is closed. In another arrangement, Fig. 3 (not shown), a pivoted flap detects the inflow of material and actuates the gate through an arm and also operates a leak-off valve controlling the valve 27. Specification 698,084 is referred to.