GB872605A - Improvements relating to centrifuges - Google Patents

Abstract

872,605. Centrifugal strainer separators. GUTEHOFFNUNGSHUTTE STERKRADE A.G. Nov. 12, 1957 [Dec. 6, 1956], No.35291/57. Class 46. A spindle 7, Fig. 1, carrying a plough 8, Fig. 2, is lowered by a rack on the spindle engaged by a pinion 6 connected to a bevel wheel 5a driven by a bevel wheel 5 loose on the driven shaft of a clutch 2 but engaged for the time being, Fig. 1, by a grooved control collar 3 which has bevel-engaging pins 4a (see Fig. 2), and is slidably secured to the driven shaft. When a notch 13 on the shaft comes opposite a locking pin 12 articulated to a forked lever 11, (the plough 8 having just entered the drum 9), the lever 11 is rotated slightly about a pivot 11a by a spring 14, whereupon the control collar 3 is disengaged by the forked end of the lever from bevel wheel 5 to prevent any further downward movement of the spindle 7 and the locking pin 12 engages the notch 13 to hold the spindle, Fig. 2. The control collar 3 is now in engagement with a clutch consisting of dogs 15-17, loosely mounted on the driven shaft, the lowermost being secured to a bush 18 in turn secured to a fixed bracket 19. The clutch 15-17 now acts to hold the rotor of the motor 1 fixed, whereupon the stator, (not shown), revolves, and with it the housing 21, (carrying spindle 7), about a bronze bushing 20 which is coaxial with the motor. The plough 8 is thus swung into contact with the drum 9, Fig. 2. When the housing 21 is prevented from further movement by engagement of a lug 22 on the housing 21 with one of two stops 23 on bracket 19, the frictional force between the top and middle dogs 15, 16 is overcome, and dog 15 in riding up on dog 16 lifts the control ring 3 to the Fig. 1 position, whereupon the locking pin 12 is withdrawn from notch 13, and the control ring 3 engages with the bevel wheel 5 to cause the spindle 7 to be lowered further. The ring 3 is held up by spindle 7 and lever 11, and dog 15 drops back. The plough now empties the drum from top to bottom until a limit switch reverses the motor, whereupon the plough completes emptying from bottom to top until notch 13 reaches pin 12 again. Housing 21 now swings back to its former position until lug 22 reaches a second stop 23, whereupon dogs 15 and 16 ride up on dog 17 to withdraw pin 12 from notch 13 and permit upward movement of the spindle 7 to be continued to the Fig. 1 position.