| 摘要 |
<p>PURPOSE:To allow an injection amount to always accurately respond to a change in the amount leaked relative to a change in oil pressure and temperature of a hydraulic unit, by comparing and computing a change in weight of a hopper and a change in flow or the like in the hydraulic unit to control the injection amount. CONSTITUTION:A piston 29 of an injection pump is driven by a hydraulic piston 12. A hopper 32 for storing a solution to be pumped is provided with a detector 39 so as to detect the weight of the hopper 32. A switch 40 detects a stroke of the piston 29. A controller 41 retains a time of one reciprocation of the piston 29 and an injection amount during the one reciprocation as a set value. A signal of actual one stroke of the piston 29 is inputted from the switch 40. At the same time, signals of a change in the weight of the hopper 32 and an amount of oil from a detector 27 are also inputted. The controller 41 compares and computes these signals to resultantly control a discharge amount of a hydraulic pump 4.</p> |
