| 摘要 |
<p>The control arrangement disclosed comprises two delivery cylinders (60) which can be actuated reciprocally by hydraulic driving cylinders (13, 14) and which open into a material-dispensing container. During the compression stroke, the container-side openings of the delivery cylinders (60) can be connected to a delivery pipe (51) via a pipe shunt (50) which can be swivelled by means of at least one hydraulic cylinder (42). During the suction stroke, the openings are in communication with the inside of the container. The control arrangement contains a reverse valve (21) which is actuated when the pistons (61, 63) reach their end positions in the delivery cylinders or in the driving cylinders (13, 14) and which ensures joint reversal of the control oil supply to the pipe shunt (50) which actuates the hydraulic cylinder (42) and to a reversing pump (2) of a free-flow hydraulic installation which controls the driving cylinders (13, 14). The reverse valve (21) can be controlled both hydraulically by means of on-off valves (15, 16) connected to the driving cylinder (14) and electrically by means of switching elements which respond to the rear end position of the delivery cylinder (61).</p> |
