| 摘要 |
Apparatus for use in spray-up construction of a fiberglass article in an open mold includes a manually operable spray gun for spraying liquid resin and liquid catalyst, and for chopping and emitting fiberglass roving together with the resin. A positive displacement resin and catalyst pump operated by an airmotor pumps resin and catalyst to the spray gun. A pneumatic electrical switch on the air-motor monitors air exhaust therefrom and is closed upon each air-exhaust pulse. The number of air-exhaust pulses of the air-motor is proportional to the cumulative amount of resin pumped. An electronic counter electrically connected to the pneumatic switch counts the number of switch closings and drives an LCD numerical display which displays the number of pulses counted. The LCD display is located on the spray gun where it can be seen by the operator during operation of the spray gun, such that the operator is continually apprised of the amount of resin which has been dispensed. Thus, the operator can stop the spray-up operation when a predetermined amount of resin has been applied to the mold. An air driven fiberglass chopper on the spray gun is supplied with air from a compressed air supply. A flow meter in line with the compressed air supply is located proximate the spray gun in view of the operator to apprise him of the rate of flow of air to the chopper.
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