| 摘要 |
A sandblasting operation includes a nozzle ( 10 ) which receives sand from a pot ( 12 ). A signaling system ( 20 ) for the sandblasting operation includes a first switch ( 22 ) to initiate the operation and a second switch ( 24 ) located at the nozzle ( 10 ) to alert the operator of the pot ( 12 ) of the need for action and also of the type of action needed. If the second switch ( 24 ) is put in one position, an alarm ( 29 ) is sounded alerting the operator of the pot ( 12 ), and a first light ( 30 ) is illuminated to indicate the need for an increased amount of sand. If the second switch ( 24 ) is put in a second position, the alarm ( 29 ) is sounded and a second light ( 31 ) is illuminated to indicate the need for a decreased amount of sand.
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