The easy deviation of the belt conveyor during operation is a common problem in the use of users, and these problems are easy to lead to belt fracture and other problems, and even affect the safety of the operator. Therefore, these protective devices must be installed on the belt conveyor.

有两种常见的避免皮带输送机偏转和滑动的设备：误差开关和滑动开关主要用于阐明误差开关的挑选和装置，便利用户理解和挑选。

There are two common devices to avoid deflection and sliding of belt conveyor: error switch and sliding switch, which are mainly used to clarify the selection and device of error switch, so as to facilitate users' understanding and selection.

误差开关是一种保护设备，用于检测带式输送机运行过程中输送带的误差程度和报警。当皮带严重偏离时，它还用于主动触发紧急中止;误差开关处于一定间隔(约50m)。它固定装置在皮带输送机两边的支架上。

The error switch is a kind of protection equipment, which is used to detect the error degree and alarm of the conveyor belt during the operation of the belt conveyor. When the belt deviates seriously, it is also used to actively trigger emergency stop; The error switch is at a certain interval (about 50m). It is fixed on the supports on both sides of the belt conveyor.

挑选准则和注意事项：

Selection criteria and precautions:

1.测验挑选二级或多级误差开关来检测皮带的不同误差程度，并为控制系统提供更多信息。

1. Test and select two-level or multi-level error switches to detect different error degrees of the belt and provide more information for the control system.

2.优先挑选具有动作记忆和动作状况指示的开关本体的产品;由于皮带输送机是动态的，这个功能能够很容易地确认皮带误差的具体位置，分析误差的原因，便于设备的调试和保护;

2. Give priority to products with switch body with action memory and action status indication; Because the belt conveyor is dynamic, this function can easily confirm the specific position of the belt error and analyze the causes of the error, which is convenient for equipment commissioning and protection;

3.可在条件下挑选非触摸式误差开关;非触摸式误差开关使光电接近开关替换滚轮，检测皮带是否偏转;长处是寿命长，保护便利，缺点是昂贵。

3. Non touch error switch can be selected under conditions; The non touch error switch enables the photoelectric proximity switch to replace the roller to detect whether the belt is deflected; The advantages are long service life and convenient protection, while the disadvantages are high price.