| 摘要 |
PURPOSE:To improve the spray efficiency by providing an exciting coil for magnetizing the aggregate in concrete mortar in the vicinity of the discharge port of a spray nozzle. CONSTITUTION:An exciting coil 6 for magnetizing the aggregate 1 in concrete mortar is provided in the vicinity of the discharge port 5a of a nozzle 5. Consequently, the aggregate 1 is magnetized when sprayed, and adsorbed by a wire mesh 9 due to magnetic force. Accordingly, the nozzle 5 with excellent spray efficiency can be obtained.
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