The invention relates to a vacuum packer, especially a vacuum chamber, working flat board and sealing air extraction device.
本发明涉及真空包装机，特别涉及一种真空包装机的真空工作室、工作平板及密封抽气装置。
One-trip setting is accomplished by pressuring up against a plugging device below the packer after it has been run to depth.
一次下钻坐封时，首先将封隔器下入到预定位置时，通过在位于封隔器下方的短接下入堵头而后加压实现坐封。
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