| 摘要 |
PURPOSE:To reduce a dust amount at the time of the spraying of concrete to a large extent, by injecting and supplying a liquid to a coating material at a wide angle by the fan-shaped spray nozzle and straight advance nozzle provided on the way of a coating material transport pipe. CONSTITUTION:Three fan-shaped spray nozzles 7 and the straight advance nozzles 8 provided therebetween are respectively connected to a fixed volume pump 10 through a liquid feed pipe 9. This pump 10 is driven by an induction motor 11 and the number of rotations of the induction motor 11 is controlled by a frequency controller 12 so as to be capable of being set to a desired value. If the frequency is changed by operating a frequency controlling dial 12a to change frequency, the number of rotations of the induction motor 11 also change and, as a result, the emitting amount of the fixed volume pump 10 can be changed in proportion to the number of rotations. |
