Today, AGVs create value in a number of ways in production facilities and warehouses. There are three characteristic features – no driver, automatic control and equipped to receive and send information. These vehicles come in many shapes and sizes such as unit loaders, platform carriers, assembly platforms and forklift trucks. But it doesn’t stop there. In the last ten years, there has been a rapid development of driverless vehicles for the industrial and logistics sectors. Some of them are called AGVs, but many are called something else. Not so strange, as innovation and marketing are about creating new categories where you can divide and conquer. However, as you will see in the next section, the similarities are greater than the differences.

如今，自动导引车已经在众多生产设施和仓库内广泛应用，并创造了巨大的价值。这种车辆具有三个特征：没有驾驶员，采用自动控制，以及可以接收和发送信息。自动导引车有多种外形和尺寸，比如小型装载机、平台运输车、组装平台、以及叉车等。但是关于自动导引车的信息还远不止于此。在过去的十年中，在工业和物流领域的无人驾驶车技术经历了长足的发展。其中一些被称为自动导引车，不过很多无人驾驶车也被冠以其它名字。毫无疑问，在创新和推广的浪潮下，会陆续催生新的市场类别，并有待人们去探寻和开拓。不过，通过下文的介绍，您可以发现：这些车辆之间有更多的相似点，而不是差异。

近年来市场对铝箔产品的板形精度要求越来越高, 同时随着市场对产品的需求和设备设计制造水平的提高, 铝箔轧机也不断向宽幅发展, 这就使得压延过程中铝箔的板形越来越难控制。由于负辊缝轧制的原因, 轧辊倾斜和液压弯辊对板形的控制作用已不明显, 同时由于工作辊与支承辊辊径比的关系及轧机辊面较宽, 弯辊控制对于轧辊中部的机械凸度控制基本无效! 。这个时候虽然通过轧辊冷却控制轧辊热凸度可减小前两种控制所剩余的板形局部偏差, 但响应速度慢, 控制效果也随厚度减薄而减弱。

Aluminum market has been seeing a demand for aluminum foil products with higher profile precision in recent years. Another trend in this market is increasingly wider aluminum foil rolls due to market needs and improved equipment design and manufacturing techniques. With wider rolls, it's more difficult to control aluminum foil profile during rolling. As a result of negative gap rolling, profile control by means of roll inclination and hydraulic bend roll has become less effective. Besides, control of the mechanical crown in the middle of the roll via bend roll hardly works due to unfavorable ratio of the diameter of the operation roll to that of the supporting roll and wide rolling surface of the roll. Although remaining partial profile deviation after the above two control processes can be reduced by roll cooling that helps control thermal crown of the roll, the response is slow, and the control effect will be impaired as the thickness decreases.