3BHE033067E0102顺序控制模块
机械安装中的故障跟踪
机械布置中有许多零件可能导致故障。程度
这些故障是可重复的。可能的原因分为以下几类。
•安装表面或适配器板有缺陷。
•强制分流。
•（称重传感器和适配器板安装不足。
•轧辊和轴承。
•从动辊。
6.4.1安装表面、支架或转接板有缺陷
未加工或加工不良的安装表面不平整，可能导致弯曲或
称重传感器扭转。这可能导致零点不稳定。
6.4.2强制调车
力分流意味着一些力被分流通过称重传感器。这可能是由于：
通过称重传感器的力受到某种阻碍。例如，
安装不正确，妨碍移动。另一个可能的原因是
滚轮不能在测量方向上自由移动，可能是因为安装了某些东西
离轴承箱太近，或因为物体松动而卡住
在轴承箱和相邻部件之间。
力分流导致卷筒纸/带材张力指示低于实际卷筒纸/带张力。
6.4.3称重传感器和转接板的紧固
未正确拧紧或失去预紧力的螺纹接头，原因
在配合表面处滑动。称重传感器的紧固尤其关键。如果称重传感器不是
如果适当固定，零点将不稳定。在其他表面之间滑动可能会导致同样的症状。
6.4.4轧辊和轴承
设计不当的轴承布置可能会导致高轴向力。卷应该是一端固定，另一端自由。
如果两端固定 由于轴的膨胀，将产生高轴向（推力）力
温度上升。即使正确设计的轴承布置也可能随着时间而恶化；轴承磨损，
这可能会产生类似的症状，如冷和热之间零点漂移缓慢或信号中的突然跳跃。
6.4.5从动辊
一个很少被怀疑的错误来源是滚动本身。在以下情况下，效果尤为关键：
称重传感器上的测量力相对较低。带相关万向节的长驱动轴
如果未正确维护接头，接头可能会导致不稳定信号。润滑很重要
Fault Tracing in the Mechanical Installation
There are a number of parts in the mechanical arrangement that can cause faults. The extent to
which these faults are repeatable differs. Possible causes fall into the following groups.
• Defective mounting surface or adapter plates.
• Force shunting.
• (nsufficient mounting of load cell and adapter plates.
• Rolls and bearings.
• Driven roll.
6.4.1 Defective Mounting Surface, Support or Adapter Plates
An unmachined or poorly machined mounting surface, which is uneven, may cause bending or
twisting of the load cell. This may result in instability of the zero point.
6.4.2 Force Shunting
Force shunting means that some of the force is diverted past the load cell. This may be caused by
some kind of obstruction to the force through the load cell. The connecting cables, for example,
have been incorrectly installed and are preventing movement. Another possible cause is that the
roll is not free to move in the direction of measurement, possibly because something is mounted
too close to a bearing housing, or because an object has worked loose and become trapped
between the bearing housing and adjacent parts.
Force shunting causes the web/strip tension indication to be lower than the actual web/strip tension.
6.4.3 Fastening of Load cell and Adapter Plates
Screw joints that have not been properly tightened or have lost their pre-tightening force, cause
sliding at the mating surfaces. Fastening of the load cell is especially critical. If a load cell is not
properly secured, the zero point will be unstable. Sliding between other surfaces may cause the
same symptoms.
6.4.4 Rolls and Bearings
An incorrectly designed bearing arrangement may give rise to high axial forces. The roll should be
fixed at one end and free at the other.
If both ends are fixed there will be a high axial (thrust) force due to expansion of the shaft with
rising temperature.
Even a correctly designed bearing arrangement may deteriorate with time; bearings become worn,
and so on. This may give similar symptoms, such as slow zero point drift between cold and hot
machine, or sudden jumps in the signal.
6.4.5 Driven Roll
A source of error that is seldom suspected is the roll itself. The effect is especially critical when
measuring forces on the load cell are relatively low. Long drive shafts with their associated universal
joints may cause unstable signals if they are not properly maintained. It is important to lubricate
