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閉口式機架為一整體鑄件制成。這種機架形式在型鋼車間中小型軋機上應用較多。隨著短應力線軋機在線快速換輥裝置的出現，使軋機投資減少，導致其應用將會更普遍。其優點是強度和剛度較高，輥跳值較小，產品精度較高。其主要缺點是制造比較困難，裝卸、換輥不方便。軋制壓力較大、對軋件尺寸要求比較嚴格時常采用閉口式機架。如初軋機、型鋼連軋機和型鋼成品軋機等。

The closed frame is made of a whole castings. This type of frame is used more in the small and medium mill in the steel workshop. Its advantages are that the strength and stiffness are high, the roll jump value is small and the precision of the product is high. Its main disadvantage is that it is difficult to manufacture, and it is inconvenient to load and load and change the roll. When the rolling pressure is larger and the requirements for the size of the rolled piece are strict, the closed frame is often used. Such as the early rolling mill, the type steel continuous rolling mill and the steel finished rolling mill, etc.

連續加熱爐連續加熱爐包括推鋼式加熱爐、步進式爐、轉底式爐、分室式爐等連續加熱爐，但習慣上常指推鋼式爐。連續加熱爐多數用于軋制前加熱金屬料坯，少數用于鍛造和熱處理。

It is named according to the varieties of rolling, the type of rolling mill and the nominal size. The principle of "nominal size"

For rolling mills, they are named after the gear ring and the pitch diameter of the herringbone gear.

在對軋機進行分類的時候，一般是按照軋輥的排列和數目進行分類。下面我們就來了解下具體的內容。比如二輥軋機，其的主要特點就是結構簡單、用途廣泛，也包括可逆式和不可逆式兩種。

When classifying rolling mills, they are generally classified according to the number and arrangement of rolls. Next we will find out the specific content. For example, two-high mill, its main features are simple structure, wide range of uses, including reversible and irreversible two kinds.