Patent GB-801091-A (GB)
Title: Hydraulic supporting means on crushing machines, more particularly for the crushing jackets of gyrator cone crushers
IPC: B02C2/04
Filed: 1957-02-21
Abstract: 801,091. Crushing machines. WESTFALIA DINNENDAHL GROPPEL AKT.- GES. Feb. 21, 1957 [March 2, 1956], No. 5864/57. Class 59 [Also in Group XXIX] A crushing machine, e.g. a gyratory crusher, in which the pistons 2 of hydraulic pressure cylinders 1 act on a movable crushing member e.g. a crushing jacket and the pressure cylinders themselves act on the machine casing, and in the working position the pressure medium acts only on one side of the pistons, is characterized in that through a four-way control valve 5, the upper cylinder spaces are connected through a pressure duct 3 with an oil pressure storage battery 4 and the lower cylinder spaces are connected through a return duct 6 with an oil container 7. A high pressure pump 11 has its motor 12 connected through electric contacts 21 with a float 8 in the container 7. Behind the valve 5, a non-return valve 15 is connected in the pressure duct 3, the valve 15 in parallel therewith a throttle valve 16 and a safety valve 17. The pressure and return ducts 3, 6 are connected by means of a duct 9 having a normally-closed throttle valve 10. In front of the valve 5, a non-return valve 18 and a throttle valve 19 are arranged in parallel in the return duct 6. The valve 5 is provided with a control lever 20 having three positions i.e. a working position a, a position b in which all ducts are throttled and a position c for lifting the movable crushing member. In operation, the valve 10 iis closed, the valve 16 is open, and the valve 19 nearly closed. The lever 20 is in the position a. The oil pressure in the battery 4 then acts on the upper cylinder spaces through the pressure duct 3 while the lower cylinder spaces communicate with the oil container 7 through the return duct 6. If the leakage losses in the cylinders 1 and valves &c. causes the oil in the container 7 to reach a predetermined height, the contacts 21 are closed thereby switching on the motor 12 so that the pump 11 sucks oil out of the container 7 and into the pressure duct 3. If an unbreakable piece gets into the crushing gap, the movable crushing member is raised and thereby raises the pistons 2. This causes oil to be forced out of the upper cylinder spaces into the battery 4 while at the same time oil is forced out of the oil container 7 into the lower cylinder spaces. When the unbreakable piece has been removed from the grinding gap and the movable crushing member and pistons descend again, the oil in the lower cylinder spaces is forced back and throttled, through the valve 19, into the oil container 7, so that the movable crushing member descends gradually. If the movable crushing member has to be raised in order to remove the unbreakable piece, the lever 20 is moved to the position c and the oil pressure is applied to the lower cylinder spaces so that the pistons 2 are lifted further. In this way the width of the crushing gap can be adjusted hydraulically provided the valve 19 is shut off to block the oil underneath the pistons. The adjustment is effected by placing the lever 20 in the position a or c. For mechanical adjustment of the crushing gap, the lever 20 is placed in the position c and the pressure duct 3 and return duct 6 short-circuited by opening the valve 10 in the duct 9. By throttling the valve 16, it is possible to operate with pressures inside the cylinders 1 that are higher than that of the battery 4.