| 摘要 |
A spraying powder gun with a built-in dust-blowing system includes a gun body (1), a gun head seat (2) and a gun needle (4). A dust-blowing gas passage which can be controllably opened and closed is constituted by arranging a powder passage (10), a main gas inflow passage (11), a first gas passage (14), a second gas passage (15), a first gas valve seat (12), a second gas valve seat (13), a first through hole (111), a second through hole (121), a third through hole (131) and a fourth through hole (141) in the gun body (1), thus implementing the dedusting of the work piece surface by operating the second gas valve seat (13). The invention is convenient in use and has high work efficiency.
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