| 摘要 |
In a pre-weaned piglet protector, sharp bursts of compressed air from dome shaped nylon air nozzles located one foot away from each other longitudinally in a farrowing area are used to irritate baby piglets. The farrowing area has a safety zone where the sow cannot sit. The area beneath the sow is covered by these sharp bursts of air. The nozzles keep bursts of air away from the baby pigs in the safety zone so they have a tendency to move to the safety zone to avoid the irritation of the air bursts. The air bursts are of a pressure and duration which is uncomfortable for the baby piglets but not sharp enough to cause any harm. The bursts of air are under the control of a controller which opens and closes the air solenoid with precisely metered intervals. The controller is activated by a diffuse reflection photoelectric sensor switch that hangs directly above the sow and detects her inclinations. When the sow gets up the sensor switch activates the controller which sends a pulsing signal to the air solenoid valve. The air solenoid valve then opens to allow pulsing high velocity bursts of air to exhaust out of the orifices of the nozzles and discourage the baby piglets from staying in the danger zone.
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