| 摘要 |
A system and method for improving the actuation of vent doors in poultry houses and other animal confinement houses is claimed. The system reduces the number of pulleys and other moving parts and increases the system reliability by replacing high-maintenance motor-operated ball screw gear drives with pneumatic cylinders that move a control line to open and close the vent doors. The system provides for variable speed of the vent door actuation and reduces the number of bends in the control line cables.
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