Abstract A high resolution rotary encoder and a piezo electric force sensor are implemented in a 16-inch laboratory-scale low consistency refiner to explore the effect of plate gaps on bar-force profiles. The sensor replaces a short length of a stator bar and measures normal and shear forces applied during the passage of each rotor bar. The rotary encoder data is used to locate the rotor bars relative to the stator bar in which the sensor is located. Previous work with this type of force sensor focuses primarily on the distribution of the maximum force measured during the passage of each rotor bar over the sensor or bar passing event, BPE. In this work, force profiles for bar passing events are registered to the position of rotor bars relative to the stator bar in which the sensor is located. These registered force profiles are measured for a range of plate gaps and two different pulp furnishes. The angular reference provided by the encoder makes it possible to generate mean force profiles. As force data for individual BPEs is highly variable, these mean force profiles have potential to shed light on the fundamental mechanisms of mechanical refining. For large gaps, there is a late peak in the force profiles that occurs toward the end of the bar passing event. For gaps that are less than the critical gap, below which fiber cutting occurs, there is an early peak in the force profiles that occurs at the start of the bar passing event. It is hypothesized that the early peak represents the corner force and, therefore, that corner force is causal in the onset of fiber cutting. To explore this hypothesis, a model is presented connecting corner force and friction force to the progression geometric variables during the bar passing event such as the bar edge length engaged at any point in the bar passing event and the area covered by the rotor bar on the force sensor at any point in the bar passing event.

中文翻译：

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LC 精炼中空间记录棒力的测量和解释

摘要 在 16 英寸实验室规模的低浓度磨浆机中实现了高分辨率旋转编码器和压电力传感器，以探索板间隙对棒力分布的影响。该传感器取代了一小段定子线棒，并测量在每个转子线棒通过期间施加的法向力和剪切力。旋转编码器数据用于相对于传感器所在的定子线棒定位转子线棒。以前使用这种类型的力传感器的工作主要集中在每个转子棒通过传感器或棒通过事件 BPE 期间测量的最大力的分布。在这项工作中，棒通过事件的力分布被记录到转子棒相对于传感器所在定子棒的位置。这些记录的力分布是针对一系列板间隙和两种不同的纸浆配料测量的。编码器提供的角度参考可以生成平均力分布。由于单个 BPE 的力数据变化很大，这些平均力分布有可能揭示机械精炼的基本机制。对于大间隙，力分布中存在一个后期峰值，该峰值出现在棒材通过事件结束时。对于小于临界间隙的间隙，在该间隙以下发生纤维切割，在棒材通过事件开始时出现的力分布中存在早期峰值。假设早期峰值代表角力，因此，角力是纤维切割开始的原因。为了探索这个假设，