包胶滚筒的寿命是比较长的，像这种要求就是要寿命长的，因为包在滚筒上边也不是很方便取下来呀，所以这就又验证一点.
The life of the rubber drum is long， and the requirement is long life， because it is not very convenient to take the package on the top of the drum，辊道， so this will verify the first point again.
同时双层滚筒输送机采用一台电机进行驱动，和**的两台滚筒线相比，节约了一台电机和电控装置的开支，这样为企业节约了成本，辊道价格，但是要注意在设计时要注意两层滚筒线之间的高度要高于物料的高度。
At the same time， a double layer roller conveyor is driven by a motor. Compared with the two independent lines， it s**es the expenses of an electric motor and electronic device. This s**es the cost for the enterprise， but attention should be paid to the height of the two layers of the roller line when the design is higher than the material.
新式的高速热轧机及连续式热轧机一般都采用单独传动系统。单独传动优点很多，辊道生产，它的制作简单，由于不需要传动齿轮及传动轴，从而大大简化了辊道的机械结构，使装拆、检修和润滑等问题也都大大简化了，辊道厂家，而且对辊子相互位置之准确度的要求也没有集体传动时那样严格。
The new type of high speed hot rolling mill and continuous hot rolling mill generally use a separate tran**ission system. Individual drive has many advantages， making it simple， because it does not need the tran**ission gear and the tran**ission shaft， which greatly simplifies the mechanical structure of the roller， the assembly and disassembly， maintenance and lubrication problems are greatly simplified， and the accuracy of the location of each roller requirements are not as strict collective tran**ission.
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