According to the revised Cailikefu＇s rolling shear force formula, motion path equation of spatial seven-bar path was built, and a mechanical model, with the new structural feature of negative offset, was thus success...According to the revised Cailikefu＇s rolling shear force formula, motion path equation of spatial seven-bar path was built, and a mechanical model, with the new structural feature of negative offset, was thus successfully established for 2 800 mm heavy shear of some iron and steel company. Shear and bar forces of steel plate, before and after the adoption of negative offset structure, were analyzed, as well as horizontal force component of mechanism that influences pure rolling shear and back-wall push force that keeps blade clearance. It was found that the back-wall push force keeps large even at the time that the maximum rolling shear was obtained; meanwhile, back-wall push force is the most approximate to side forces when 60--100 mm of offset was adopted. Both theoretical results and onsite shear quality show that the negative offset plays an important role in ensuring the stability of pure rolling shear and keeping blade clearance constant.展开更多
Nowadays,enterprise customers have higher and higher requirements for steel plate quality,and the performance research of shearing machine has been widely paid attention to.In this paper,the finite element analysis so...Nowadays,enterprise customers have higher and higher requirements for steel plate quality,and the performance research of shearing machine has been widely paid attention to.In this paper,the finite element analysis software ANSYS is used to analyze and verify the key parts of the downcut inclined blade shears.Through continuous analysis and improvement of the model,the weak points areoptimized to improve the shear performance andproduction efficiency of the shears.展开更多
Scale-up of the high shear wet granulation （HSWG） process is considered a challenge because HSWG is complex and influenced by numerous factors, including equipment, formulation, and process variables. For a system o...Scale-up of the high shear wet granulation （HSWG） process is considered a challenge because HSWG is complex and influenced by numerous factors, including equipment, formulation, and process variables. For a system of microcrystalline cellulose and water, HSWG experiments at three scales （1, 2, and 4 L working vessel） were conducted with a granulator. Scale-up was implemented on the basis of a nucleation regime map approach. To keep dimensionless spray flux and drop penetration time constant, water addition time at three processing scales were 300, 442, and 700 s, respectively. The other process parameters were kept unchanged. Granule size distributions were plotted and compared, and scanning electron microscopy was used to analyze granule surface morphology. Physical characterization was undertaken using a modified SeDeM method. At nearly all scales, granule yield was greater than 85% and all the cosine values were larger than 0.89. At the same experiment points, granules at all scales had similar surface morphology and similar physical characteristics. The results demonstrate that a rational scaling-up of the HSWG process is feasible using a regime map approach.展开更多
基金Item Sponsored by National Natural Science Foundation of China (50575155)National Tenth-Five Key Technologies Research and Development Program(ZZ01-13A-03-03-04)Shanxi Provincial Key Technologies Research and Development Program of China (2006031174)
文摘According to the revised Cailikefu＇s rolling shear force formula, motion path equation of spatial seven-bar path was built, and a mechanical model, with the new structural feature of negative offset, was thus successfully established for 2 800 mm heavy shear of some iron and steel company. Shear and bar forces of steel plate, before and after the adoption of negative offset structure, were analyzed, as well as horizontal force component of mechanism that influences pure rolling shear and back-wall push force that keeps blade clearance. It was found that the back-wall push force keeps large even at the time that the maximum rolling shear was obtained; meanwhile, back-wall push force is the most approximate to side forces when 60--100 mm of offset was adopted. Both theoretical results and onsite shear quality show that the negative offset plays an important role in ensuring the stability of pure rolling shear and keeping blade clearance constant.
基金2021 Regional Innovation Joint Fund Project of Natural Science Foundation of Liaoning Province(2021-YKLH-13,2021-YKLH-03).
文摘Nowadays,enterprise customers have higher and higher requirements for steel plate quality,and the performance research of shearing machine has been widely paid attention to.In this paper,the finite element analysis software ANSYS is used to analyze and verify the key parts of the downcut inclined blade shears.Through continuous analysis and improvement of the model,the weak points areoptimized to improve the shear performance andproduction efficiency of the shears.
基金The authors acknowledge research funding support from the Beijing Natural Science Foundation of China： study on the dimensionless modeling of high shear wet granulation process for Tanshinone extract （No. 7154217）, joint development program funding from the Beijing Municipal Education Commission of China （Key Laboratory Construction Project： study on the integrated modeling and optimization technology of the pharmaceutical process of Chinese medicine preparations）, and the program funding from the National Natural Science Foundation of China： study on the quality transfer model and global optimization method of the chained pharmaceutical process of Chinese medicine products （No. B1403112）.
文摘Scale-up of the high shear wet granulation （HSWG） process is considered a challenge because HSWG is complex and influenced by numerous factors, including equipment, formulation, and process variables. For a system of microcrystalline cellulose and water, HSWG experiments at three scales （1, 2, and 4 L working vessel） were conducted with a granulator. Scale-up was implemented on the basis of a nucleation regime map approach. To keep dimensionless spray flux and drop penetration time constant, water addition time at three processing scales were 300, 442, and 700 s, respectively. The other process parameters were kept unchanged. Granule size distributions were plotted and compared, and scanning electron microscopy was used to analyze granule surface morphology. Physical characterization was undertaken using a modified SeDeM method. At nearly all scales, granule yield was greater than 85% and all the cosine values were larger than 0.89. At the same experiment points, granules at all scales had similar surface morphology and similar physical characteristics. The results demonstrate that a rational scaling-up of the HSWG process is feasible using a regime map approach.
