Hatch covers are mainly divided into three categories: lifting hatch covers for containers, side-moving hatch covers for bulk carriers and folding hatch covers for general cargo ships. Among them, the folding hatch cover can also be used in bulk carriers with hatches, and the hanging hatch cover can also be used in ordinary cargo ships. If the overtime space is limited, sliding hatch covers (mostly along the longitudinal direction of the ship) can also be installed in a stacked way, that is, two or more hatch covers can be stacked together by hydraulic devices and then moved along the hatch according to actual needs. 1. Hanging hatch covers are usually used to cover the open deck of container ships, and containers can be placed on the hatch covers. Used in ordinary cargo ships, you can use the suspended hatch cover to separate the goods vertically. In this case, the hatch cover can be used as a double deck. Hanging hatch covers are divided into single-plate hatch covers and multi-plate hatch covers. 2. Folding hatch covers are mainly used for bulk carriers and multi-purpose ships. Folding hatch covers are divided into high folding hatch covers and low folding hatch covers. The low folding hatch cover is usually used when the folding height is limited, and the required folding length is greater than that of the high folding hatch cover. The sealing between the hatch cover and the cabin enclosure is generally realized by rubber sealing strips, which are fixed on the hatch cover and pressed against the cabin enclosure for sealing. Similar between cover plates. 3. The side-moving hatch cover is mainly used for bulk carriers, and its operation is to move the hatch cover to both sides of the ship to empty the cargo hold. The operating machinery can be driven by guide rail, gear or chain, and the basic setting methods are: single cover type, with the hatch cover on one side of the hatch; Double cover type, the hatch covers are on opposite sides of the hatch. The hatch cover can be partially opened to maintain air circulation and prevent rainwater from entering in large quantities. It is also feasible to install a side-moving hatch cover at the tail. The hatch cover can move in the direction of the captain. Zy 16 is provided by China Shipping Intelligent Machinery.