In gravure printing process, it is easy to trigger an explosion for the explosive volatile solvents of drying system accumulated. In this paper, the lower explosion limit (LEL) is introduced to drying system of the gravure press, and the LEL value is calculated. Then added the LEL sensor to the drying system to monitor and control the concentration of gas in the solvent evaporation. Finally, the structure of the drying system is optimized. It is showed that the consumption of the steam is reduced sharply, the drying system has pronounced energy-saving effect, and operated more steadily and more efficiently.
The anticipated use of elastic membranes for deflection-based rain gauges has provided an impetus for this paper to revisit the large deflection problem of a peripherally fixed circular membrane subjected to liquid weight loading, a statics problem when the fluid–structure interaction of membrane and liquid reaches static equilibrium. The closed-form solution of this statics problem of fluid–structure interaction is necessary for the design of such membrane deflection-based rain gauges, while the existing closed-form solution, due to the use of the small rotation angle assumption of the membrane, cannot meet the design requirements for computational accuracy. In this paper, the problem under consideration is reformulated by giving up the small rotation angle assumption, which gives rise to a new and somewhat intractable nonlinear integro-differential equation of the governing out-of-plane equilibrium. The power series method has played an irreplaceable role in analytically solving membrane equations involving both integral and differential operations, and a new and more refined closed-form solution without the small rotation angle assumption is finally presented. Numerical examples conducted show that the new and more refined closed-form solution presented has satisfactory convergence, and the effect of giving up the small rotation angle assumption is also investigated numerically. The application of the closed-form solution presented in designing such membrane deflection-based rain gauges is illustrated, and the reliability of the new and more refined closed-form solution presented was confirmed by conducting a confirmatory experiment.
The vibration cutting is better than the ordinary cutting because the slight division effect, which is created in the vibratory cutting process, reduces the cutting resistance. Kinematic analyzing of the vibration cutting process, dynamic model of the vibration cutting mechanism and simulation analysis are developed. A contrastive analysis on the movement relationship between the cutting tool and the paper stack is given during the ordinary and vibration cutting process respectively. The relative position of the cutting tool and paper stack at different cutting velocity is analyzed and the best cutting speed is given. The conclusions are as follows. The precondition of realizing the vibration cutting effect is that the cutting speed is smaller than the maximum vibration velocity of cutting knife. The vibration force is obtained and enhancing vibration force can reduce the cutting resistance.
The harmonic reducer has been widely used in military, industrial and agricultural fields because of its large transmission ratio, high precision, small backlash, stable transmission and small volume and weight. Flexible bearing is a key component of harmonic reducer, and its static mechanical properties are one of the main factors influencing the fatigue life and load carrying capacity of harmonic reducer. Mathematical model of contact force between rolling element and outer ring is established basing on three bending moment equations. This paper takes the CSF-40-80 flexible bearing with double eccentric arc cam as the research object, the finite element methods (FEM) analysis is used to study the deformation and stress of the flexible bearing under no-load and load. The effect of the double eccentric arc cam eccentricity on the stress is also presented, which provides theoretical support for the optimization of harmonic reducers and the manufacture of high-performance harmonic drive systems.
By means of considering improved Lundberg-Palmgren (L-P) fatigue life theory and rollers and other comprehensive factors, a model of fatigue life is setup for eccentric double row cylindrical roller bearing under rotation. On this basis, the calculation flow chart is given and the fatigue life is calculated. Then come to the conclusions that the fatigue life of bearing is influenced by radial load, rotating speed, radial clearance.
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