PROBLEM TO BE SOLVED: To provide a powder density adjusting device capable of managing total amount of powders to be transported easily while keeping the powders to be transported to a destination section by air stream at desired density.SOLUTION: This powder density adjusting device is provided with an air feeding system 61 and a density controller 59. An injection nozzle 52 for blowing the powders to be supplied off by transported gas is provided in an injection part 51. Dilution nozzles 55, 56 for mixing diluted gas into an adjusting cylinder 53 receiving the air stream containing the blown-off powders from one end and having an outlet 53a at the other end and a density sensor 54 for measuring density of powders in the air stream containing the powders are provided in the adjusting cylinder 53. A system 61 is provided with a flow rate adjusting valve 65 connected with a gas source, an air feeding path 66 having a flow rate adjusting valve 68 and connecting the valve 65 with the nozzle 52, and an air feeding path 71 having a flow rate adjusting valve 73 and connecting the valve 65 with the nozzles 55, 56. The controller 59 controls the valve 65 so that total flow rate obtained by adding flow rate of transported gas and flow rate of diluted gas is kept at constant amount, controls the valves 69, 73 based on the results of measurement by the sensor 54, and adjusts a ratio of flow rate of transported gas and flow rate of diluted gas to bring powder density to target density.COPYRIGHT: (C)2007,JPO&INPIT【課題】気流によって目的部位に輸送される粉末を所望濃度に保持しつつ、輸送される粉末の総量管理が容易な粉末濃度調節装置を提供する。【解決手段】送気系統61及び濃度コントローラ59を備える。補給される粉末を輸送気体で吹飛ばす噴射ノズル52を噴射部51に設ける。吹飛ばされた粉が混じった含粉気流を一端から受入れ他端に出口53aを有した調節筒53に、この筒内に希釈気体を混入させる希釈ノズル55,56と、含粉気流の粉末濃度を測定する濃度センサ54とを設ける。系統61は、気体源に接続された流量調節弁65、流量調節弁68を有して弁65とノズル52を接続した送気経路66、及び流量調節弁73を有して弁65とノズル55,56を接続した送気経路71を備える。コントローラ59は、輸送気体の流量と希釈気体の流量とを合計した総流量が一定に保持されるように弁65を制御し、センサ54の測定結果に基づき弁69,73を制御することで輸送気体の流量と希釈気体の流量との割合を調節して、粉末濃度を目標濃度とする。【選択図】図1
