| The measurement accuracy of powder has alway’s been a problem that plagues food and pharmaceutical production enterprises,among which the screw measurement method has high measurement accuracy,and there is rarely a phenomenon of blocking materials in the transportation process,which is a metering and transportation method that is more common in the use of small amounts and trace powders,but the powder is easy to attach to the surface of the metering machine,resulting in a reduction in measurement accuracy.Aiming at the problem of adhesion between powder and conveyor tools,the surface interaction characteristics of powder and conveyor tools are analyzed from the microscopic scale,and the following research contents are carried out:Based on the super-thinning model,the theoretical mechanical model of particles and substrate surface is established,the main forces on the substrate surface of particles are analyzed,and the optimization goals of particle resistance reduction and desorption are clarified,which provides a theoretical basis for the construction of microstructure on the surface of the machine.By studying the surface morphology with drag reduction characteristics,combined with the modeling software,the surface microstructure morphology is constructed,and the influence of different surface morphology on the drag reduction is analyzed.Observe the microscopic morphology of cephalosporin samples,describe the morphological characteristics of cephalosporin samples,analyze the particle size distribution range of cephalosporins,determine the particle size scale range of experimental particles,obtain the edge characteristics of particles by using the superposition of edge morphological features,extract the edge characteristics of particles by binary method,reconstruct the three-dimensional morphology of actual powder particles by means of spherical particle superposition,and simulate the particle size scale of actual particles by equivalent volume method.The interaction between particles and substrate under the equivalent particle size of cephalosporin particles at different scales was studied to illustrate the influence of equivalent particle size on particle desorption at different scales,and the interaction between particles and substrate under different substrate inclination angles was studied to illustrate the influence of basal inclination on particle desorption,and the optimization test results of the basal inclination test were increased to obtain the best angle conducive to particle desorption.The microstructure structure of the femtosecond laser on the substrate surface of 304 stainless steel is used to observe the processed substrate surface,analyze the influence of laser scanning speed parameters on the surface morphology of the processing substrate,and analyze the reasons for the formation of the width and depth of the laser processing groove.Transverse and longitudinal particle desorption tests are performed on the microstructure constructed by the laser on the substrate surface,and the effect of the surface microstructure on particle desorption is verified by the particle desorption inclination angle.In view of the situation that the powder particles cannot be fully desorbed,the desorption test of the substrate surface adhesion particles is carried out by ultrasonic vibration,and the morphology of the desorption of the powder particles on the substrate surface is observed to determine the effect of vibration desorption. |
