| 摘要 |
PURPOSE:To construct a sand pile made up of uniform amounts of sand by a simplified method in which the ratio between the drawing length of a hollow pipe and its moving distance in sand layer, satisfying disign amounts, is memorized in an arithmetic unit, output signals from a depth guage and a sand level meter are put in the arithmetic unit, and the shortage of the drawing length of the hollow pipe is displayed on an operation indicator. CONSTITUTION:A depth guage and a sand level meter are attached to a sand pile-forming hollow pipe. When a sand level input voltage is changed and also a depth input voltage is changed, signals are sent through an input amplifying circuit As1 to a differential circuit As2 and with the signal of an analog memory circuit M1 to a ratio setting circuit As3 on the sand level input circuit side. On the other hand, on the depth input circuit side, signals are sent, together with the signal of an anolog memory circuit M2, to a differential circuit Ag2 through an input amplifying circuit Ag1. Both signals are sent to a differential circuit Asg to operate the pointer 2 of an operating indicator 1. By this, the excess or shortage of the amount of sand discharged in the hollow pipe is known and the pointer 2 is adjusted so as to indicate zero. |
