| 摘要 |
PURPOSE:To improve safety of operation for shooting through a chute in a shute supported by a rising and falling boom by fixing the chute to the boom in such a manner as to freely incline and keeping constant an angle of inclination of the chute in a vertical line, interlocking with an angle of rising and falling the boom. CONSTITUTION:A change-over switch 25 is connected to B, and a chute angle setting device 28 is operated by a lever 35 to contract a motor-driven cylinder 3 through a relay control panel 26 and a motor 3a, so that the chute is inclined at an angle phi0 of inclination. When with loading and unloading, a boom is turned to draw up the chute, the switch 25 is switched to A to be connected to a comparator 24 side, thereby stopping the shute angle setting operation of a lever 25. Thus, an expansion stroke 20 of the motor-driven cylinder 3 is output as an angle theta0 of inclination of the chute at a connecting point 29 through a function generator 23 and a memory device 31, and compensated by an angle psi of inclination of the boom to be input to a connecting point 36, thereby driving the motor 3a. In this arrangement, the angle of the chute is kept constant to ensure safety of operation. |
