A microfluidic bubble perfusion device for brain slice culture

Ex vivo brain slice cultures are utilized as analytical models for studying neurophysiology. Common approaches to maintaining slice cultures include roller tube and membrane interface techniques. The rise of organ-on-chip...

The DESIGN OF ROLLER ON WHEELS REMOVAL AND INSTALLER AIDS ON ANOA PANSER COMBAT VEHICLE

The Army has a combat vehicle Panser ANOA 6x6 which is produced by PT. Pindad. The Panzer model combat vehicle has a number of 6 large wheels with a diameter of 1300 mm and a weight of 250 Kg on each wheel. A large number of vehicles are not supported by 'Special tool' or equipment that has a function to facilitate heavy work that has a high risk of work accidents. Therefore, a Panser wheel release and installer are made with a Roller buttress as a lift pad and the Panser wheel player is quite operated by one personnel. The method used in this study is an experimental method to find out the results of analysis on roller and wheel installer Panser ANOA 6x6. The loading received at roller construction is 1226.25 N, the bending pressure of the shaft is 546.18 N/mm2, the bending moment of the shaft is 429.19 Nm, the shaft mass is 1.7 Kg. The Roller tube flexing pressure is 879.05 N/mm2, the bending moment is 416.93 Nm and the Roller tube mass is 2.84 Kg. Welding Pressure Roller is 0.325 N/mm2. Faced with the modulus value of ST40 steel elasticity, roller construction is very capable of receiving panzer Anoa 6x6 wheel load. Keywords: Construction, Roller, Pressure, Moment

Structure parameter optimization and bearing limit analysis of the expansion unit of three-roller tube expander

The critical technical issues for the structure design of three-roller tube expander were first studied and analysed in this paper. Then, the major design parameters of the expansion unit structure and the bearing limit of 12¼″ three-roller tube expander were optimized and investigated by finite-element numerical simulation method. Results from study show that the required expansion force increases when the taper angle of the roller outer surface gets larger, taking the axial expansion force as the quantitative indicators. It is suggested that the roller tape angle of the expansion unit should be in the range of 9–12° considering the proper length of the roller and the non-self-locking tube expansion process. The required expansion force of the bellows first decreases and then increases when the gauge length of the expansion unit becomes longer. The optimal value of the gauge length is 50 mm considering the proper length of the roller. And according to the numerical simulation results, the designed three-roller tube expander meets the strength requirements. The results of this study are of great significance to the expend bellows drilling technology.