Automatically drop the cap, the cap drop is accurate and there is no deviation from the barrel mouth. Automatic capping, the capping is tight, there is no gap between the lid and the barrel body, and the finished product is inverted without overflowing. Speed matches the filling machine. The silo is alarmed for lack of cover, and the alarm is stopped when the cover fails; the
capping device should be adjustable to ensure that the compaction meets the requirements. The cover stacks are automatically supplied, and several stacks can be buffered, saving labor.