Simulation and optimization of key component structure of vertical spiral extrusion filling equipment for polymer⁃based high⁃viscous slurry

doi:10.19491/j.issn.1001-9278.2024.05.019

Abstract

Abstract:

To solve the problem of human⁃machine interaction and manual operation in the charging process of polymer⁃based high⁃viscous slurry， a vertical spiral extrusion⁃charging process was adopted to obtain a continuous loading of energetic slurry. Based on analyzing the characteristics of the high viscous slurry， the screw configuration and barrel structure were simulated and optimized. The results indicated that pineapple head mixing element not only improved the particle⁃mixing effects but also caused hidden dangers such as a rise in high shear and high temperature. Therefore， this mixing element is not suitable for the stable and safe transportation of a high⁃sensitivity slurry. Meanwhile， the blocking effect of the flow channel was significantly reduced by setting the size of the die and the cone angle of the barrel to be Φ30 mm and 1 °， respectively. This could weaken the hidden dangers such as high pressure and high temperature to ensure process safety.

Key words: extrusion?charging process, numerical simulation, structural design, process safety

CLC Number:

TQ320.5

LIN Gaoming, ZHANG Guohui, ZONG Huceng, WANG Chongyang, HE Youfeng, WANG Suwei. Simulation and optimization of key component structure of vertical spiral extrusion filling equipment for polymer⁃based high⁃viscous slurry[J]. China Plastics, 2024, 38(5): 107-112.

Figures/Tables 10

Fig.1. Rheological characteristic curves of the slurry

Fig.2. Geometric configuration of the barrel and screw

参数		有效长度/mm	螺棱宽度/mm	螺距/mm	螺棱间隙/mm	压缩比
倒锥段		187	6	46	1.0~7.4	—
平直段	输送区	93	6	46	1.0	1.0
	压缩区	120	6	46	1.0	1.2
	计量区	128	6	46	1.0	1.0

Tab.1. Parameters of the screw structure

物性参数	比热容/J·（kg·℃）^-1	热导率/W·（m·℃）^-1	密度/kg·m^-3	弹性模量/GPa	泊松比
药浆	1 234.1	0.6	1 740	—	—
螺杆	500.0	15.0	7 980	206	0.3

Tab.2. Physical property

边界名称	运动边界条件		热边界条件
入口	自由流动	$f n$ = $f s$ =0	固定温度，100 ℃
出口	自由流动	$f n$ = $f s$ =0	自由流出
机筒内壁面	壁面无滑移	$v n$ = $v s$ =0	固定温度，100 ℃
螺杆表面	螺杆转速	20 r/min	热交界面

边界名称	运动边界条件		热边界条件
入口	自由流动	$f n$ = $f s$ =0	固定温度，100 ℃
出口	自由流动	$f n$ = $f s$ =0	自由流出
机筒内壁面	壁面无滑移	$v n$ = $v s$ =0	固定温度，100 ℃
螺杆表面	螺杆转速	20 r/min	热交界面

Tab.3. Boundary conditions

Fig.3. Flow field characteristic parameter curves and cloud charts of the slurry under different screw configurations

Fig.4. Flow field characteristic parameter curves and cloud charts of the slurry under different die sizes

Fig.5. Flow field characteristic parameter curves and cloud charts of the slurry under different θ

Fig.6. Screw stress， deformation curves and cloud charts

转速/ r·min^-1	最大应力/MPa	最大应力比/ %	应力判定/ MPa	评定
10	17.10	14.62	17.10≤1.5S	可行
20	24.92	21.30	24.92≤1.5S	可行
30	31.03	26.52	31.03≤1.5S	可行
40	36.24	30.97	36.24≤1.5S	可行
50	40.80	34.87	40.80≤1.5S	可行

Tab.4. Stress intensity verification of the inverted cone section cylindrical structure

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