粉體流動測試儀（轉鼓法）

1.   概述： Outline

轉鼓法即將粉體顆粒填充轉鼓中讓其緩慢轉動，測定固定轉速下每旋轉一圈顆粒發生坍塌的次數，次數越大，流動性越好；反之越小，流動性越差。此方法反映了顆粒流動的穩定性、臨界轉變及坍塌規模.和質量流率.滿足歐洲藥典要求.
粉體流動測試儀（轉鼓法）

Drum method is filling  the powder in the granular drum and make it slow rotation, measue the number of times the particles collapse at the fixed speed, the greater the number, the better the liquidity;The smaller the reverse, the worse the liquidity.This method reflects the stability of particle flow, critical transformation and collapse scale, and mass flow rate. Meet the requirements of European pharmacopoeia.
粉體流動測試儀（轉鼓法）

轉鼓中顆粒表面因流速不同從上到下可分為 3個區域：即稀疏流動區、致密流動區和蠕變區；剪切率的變化對顆粒流動特征和運動狀態具有決定性影響；顆粒在轉鼓中的運動有一個顯著特點，即可以大致分為流動表層和靜止底層兩個區域，將顆粒物質從靜止狀態發展到流動、再由流動通過堵塞轉變為靜止的全過程有機地統一起來。通過調節轉鼓的旋轉速度，可獲得顆粒的流動過程與流動狀態.

The particle surface of the drum is divided into three regions due to different flow velocity: the sparse flow area, the dense flow area and the creep region.The change in shear rate has a decisive effect on the Flow characteristics and motion state of the particles.Particle motion in the drum has a distinctive features, which can be roughly divided into flow surface and static bottom two area, The whole process of moving particles from rest to flowing and flowing through blockages to static processes is organic unify .By adjusting the rotation speed of the drum, the flow process and flow state of the grain can be obtained.

根據轉鼓中顆粒流動層厚度或自由表面傾角，獲得流動層的剪切速率，進而計算得到顆粒物質的流動性. 不同轉速和轉鼓直徑下從中心到自由表面的致密流動區域內顆粒的剪切變形速率都具有線性變化特征，平均剪切率，反映顆粒流動的平均剪切變形能力，顆粒尺寸、形狀、摩擦因數及流動狀態等因素的影響。

According to particle flow layer thickness in drum or free surface inclination, obtain flow layer shear rate, and then calculate the particle nature of liquidity. Under different rotational speed and different drum diameter ,The shear deformation rate of particles in the dense flow area from the center to the free surface has linear variability,The average shear rate, reflect  the effect of average  flow shear and deformation capacity of the particle, particle size, shape, friction factor and the flow state etc factors.

二、適用范圍：Scope of application

在粉末冶金、食品、制藥、金屬、化工、農業等生產過程中，廣泛涉及到顆粒物流動，如筒倉卸料、傳輸、混合、流化和固/氣分離等， 分析顆粒物料的流動特性，對于防止發生粉體堵塞、控制顆粒成分的均勻性和一致性都具有至關重要的意義。

Widely used in powder metallurgy, food, pharmaceutical, metal, chemical industry, agriculture, etc. production process, Widely involved in particle flow, such as silo unloading, transport, mix, fluidization and solid/gas separation and so on, Analysis of the flow characteristics of the material particles, It is of vital important to prevent powder blocking and Control particle components’s evenness and uniformity.

三、技術參數：technical parameter

轉鼓圓筒直徑diameter of the drum cylinder：20cm

深度（長度）Depth（length）：13.3cm

轉鼓滾筒截面為透明

The cross section of drum roller is transparent.

轉鼓滾筒的轉動速率rotation rate of drum roller：0.8 r/min -120 r/min，

分辨率Resolution： 0.01 r/min.

轉鼓內部填充粉體試樣至容積50%.

The drum is filled with powder sample to volume 50%.

轉速大致范圍 3~9 r/min 時顆粒能夠保持穩定的流動，且自由表面保持平直.

When the rotation rate is about 3~9 r/min, particles can maintain steady flow，and the free surface remains flat.

采用CCD圖像處理法，通過PC軟件實時分析和數據曲線處理.

Using CCD image processing method, real time analysis and data processing by PC software.

使用環境：實驗室環境Environment: laboratory environment

電源Power supply：220V, 50/60Hz