Papers by Keyword: Rotary

Abstract: Coke production is carried out by coal carbonization. The most frequently used coal is anthracite, which features a very low content of volatile substances that not exceed 7%. Current anthracite production is carried out in rotary furnaces, consists of processes as follows: drying, heating, pyrolysis and calcination. Coke cooling is performed in cooling device located at the end of the furnace. To enhance the performance and reduce the specific heat consumption, use of the preheating device for rotary charge was proposed. The charge granulometry allows using the preheating device based on thin layer principle. Proposed solution was verified by simulations.

Abstract: We develop new drawing technologies of rotary laser dieless drawing for the fabrication of micro-tubes without the need for tools such as dies, plugs and mandrels. A rotary laser dieless drawing apparatus with local heating using a laser irradiated from one direction as the heating source has been focused on for the fabrication of micro-tubes. In this study, a dieless drawing with a semiconductor laser setup with power of 30W is designed and developed. A workpieces was rotated about a tensile axis by rotary stage with chucks for circumferential uniform temperature distribution. A tube of stainless steel SUS304, with an outer diameter of 0.5mm and thickness of 0.13mm is used in the experiments. In this experiment, we verify the effectiveness of the developed rotary laser dieless drawing apparatus.

Abstract: A novel hydraulic rotary high speed on/off valve is investigated. The function of the outlet turbine and the effect on revolution speed of valve spool are analyzed. The inner fluid flow condition under full open case of the on/off valve is simulated using computational fluid dynamics(CFD) method based on Ansys/Fluent and velocity and pressure profiles of fluid inside valve are obtained. Suggestions on optimizing the geometry of valve to decrease transition losses are given.

Abstract: In view of many problems of the windows existing in the current market ,to design omni-bearing translation and rotary windows can solve the problems of cleaning the ordinary windows .At the same time, regulating the rotation angle of the windows can change the ventilated area arbitrarily and improve the residential environment .The windows includes five parts: gearing mesh structure, cap button device, window frame guide groove structure, magnetic induction structure and window locked structure.

Abstract: The method to transfer energy by less-contact magnetic force can decrease mechanical energy loss comparing with that by mechanical contact. In this paper, a novel piezoelectric rotary generator was designed based on the theory of the transition from less-contact magnetic force to the mechanical energy. ANSYS software was used to calculate the driving forces for the piezoelectric cantilever beam from the rotary wheel rotate in the different positions. The periodic driving force for the piezoelectric cantilever beam was obtained by the methods of fitting and Fourier transform. Laws of dynamic performance for piezoelectric cantilever beam were obtained by dynamic analysis. The results show that the low-frequency and variable rotational mechanical energy in the natural environment can be harvested by this novel rotary piezoelectric generator.

Abstract: A newly inertial piezoelectric rotary actuator is proposed based on controlling the orderly changes of friction force between the rotator and supporting faces in mechanical way. The dynamic simulation model of the actuator is derived. A prototype small inertial rotary actuator characterized by two symmetric piezoelectric stacks has been fabricated based on the proposed method. The actuator can rotate when it is powered with a square-wave or sine-wave voltage. The experimental and simulation results show that its angular speed is proportional to both the driving voltage’s amplitude and the frequency. The experimental results also show good agreement with the simulation analysis.

Abstract: A rotary ultrasonic motor using longitudinal and bending vibration modes is proposed in this study. The proposed motor contains two exponential shape horns located on two ends, and the end tips of the horns are used as the driving feet. Two groups of PZT elements (Longitudinal PZT and Bending PZT) are clamped in the middle of the motor by a double head flange bolt to excite the longitudinal vibration mode and bending vibration mode of the motor, respectively. By the composing of the longitudinal and bending vibration modes, elliptical trajectory vibrations can be generated on the end tips of the horns, which have the same rotation directions and can driving the rotor together by frictional force. After the introducing of the working principle, modal analysis is developed to tune the resonant frequencies of the longitudinal and bending vibration modes to be close with each other. At last, transient analysis is developed to gain the vibration characteristics of the motor, and the gained elliptical trajectory motions of particles on the driving parts verify the feasibility of the proposed design.

Abstract: In order to make full use of sunlight and improve photocatalytic degradation efficiency, a new rotary solar photocatalytic reactor with focus reflector was designed. The new type of solar photocatalytic reactor we designed solves such problems as shallow optical depth, small surface area, the need for aeration and agitation, insufficient contacting time or sunlight intensity in the photocatalytic reaction. It has the characteristics of cheap price and easy operation. Using focus reflector to increase the light intensity can improve decomposing efficiency. The paper also studied the method for the immobilization of the catalyst.

Abstract: Nano-sized BaTiO3 powders with narrow size distribution and the high tetragonality were attempted to synthesize by the rotary-hydrothermal process in water system, using two kinds of commercial anatase-type TiO2 (ST21/ST01) with different particle size and Ba(OH)2. The rotary-hydrothermal syntheses were done with the rotary-speed of 20 revolutions per minute at 523 K for 24 h. Highly- and mono-dispersed BaTiO3 powders were successfully synthesized by applying the rotary-hydrothermal process. For rotary-hydrothermal synthesis, it was found that the average size, tetragonality, and quality of the BaTiO3 particle strongly depended on the particle size of the starting material. In the case of using ST01 as a starting material, BaTiO3 nano-powders mainly composed of coarse-faceted particles (average particle size = ca.100 nm) with the tetragonal phase and very little lattice defects were successfully synthesized.

Abstract: A MEMS thermal actuator that provides rotational or near-linear translational displacements is investigated. This actuator provides a solution to applications that require highforces and large displacements. Output moments up to 7x10-7 N-m and free rotations of up to 3 degrees were measured. These correspond to forces of up to 1.44mN at a displacement of 23.7μm, yielding a work of 3.41x10-8 N-m. An electrothermal-mechanical model that considers temperature dependence of material properties is presented, and the model predictions show good agreement with actuator test data.