| 摘要 |
PURPOSE:To try to reduce the number of occurrence of vibration and noise by using an accumulator only for force-feeding raw concrete of poor blending under high pressure without using said accumulator for force-feeding ordinary raw concrete under low pressure. CONSTITUTION:In the case of sucking and force-feeding, by concrete pumps 34, 44, raw concrete mixed with little moist and much aggregate and hard to be force-fed, it is arranged that the pressure of a pressure switch PS is set to 120kg/cm<2>. And, when discharge pressure of a hydraulic pump 21 is below 120kg/cm<2>, pressure oil discharged from the hydraulic pump 21 is not supplied to main cylinders 32, 42, which become to make a pause, and pressure oil is stored into an accumulator 28. Also, when the discharge pressure of the oil hydraulic pump 21 becomes above 120kg/cm<2>, pressure oil from the main hydraulic pump 21 is supplied to the main cylinder 32 through a high pressure line 22a, and poorly mixed raw concrete is forcibly fed from the concrete pump 44 as soon as it is sucked into the concrete pump 34.
|
