Mechanical Science and Engineering is an international, peer-reviewed open access journal dedicated to advancing research the field of mechanical engineering. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: The market demand for portable projectors has been high because they are portable and can be easily used on different occasions, such as business demonstrations, educational training, home theater, etc. With the continuous progress of technology, portable projectors have more and more diversified functions, such as supporting wireless screen projection, built-in battery, HD projection, etc., which also further increase the market demand. A projection system based on the LED microarray was designed. The system consists of a display unit and a projection objective lens. A 10mm×7.5mm self-emitting LED microarray was used as the display unit, and the projection objective was designed with an optical design zemax. The projection objective has antiremote optical structure with full field of 66 and focal length of 8.5mm; At the spatial frequency of 85 lp/mm, the modulation transfer function MTF is greater than 0.5 and the distortion is less than 1%. Meet the design requirements of the projection system. The projection system has the advantages of small size, simple structure, good projection effect and convenient processing, which can provide reference for the development of the third generation projection technology.Abstract: The market demand for portable projectors has been high because they are portable and can be easily used on different occasions, such as business demonstrations, educational training, home theater, etc. With the continuous progress of technology, portable projectors have more and more diversified functions, such as supporting wireless screen projec...Learn More
Abstract: Before the milk is packaged and circulated to the market, the mechanical properties of the straw equipped with it will be tested, such as fragility and folding resistance. However, at present, all dairy factories use manual methods to detect the fragility and folding resistance of straws, which has a series of problems such as heavy workload of quality inspectors, low detection efficiency and insufficient accuracy of detection results. In order to solve the above problems, this paper designs a semi-automatic straw detection device, which uses the rotation of straw fixing parts to realize the simultaneous adjustment and pressing of the angles of multiple straws, and moves multiple straws to the folding bottom plate for bending by operating the moving base, so as to realize the simultaneous fixed detection of multiple straws. Compared with the existing manual detection, the device has higher detection accuracy and better standard stability, which improves the detection efficiency and can better solve the problems existing in the current manual detection of straws. The test results show that the device can effectively reduce the workload of quality inspectors and improve the detection accuracy. Therefore, the design of straw folding detection device is feasible.Abstract: Before the milk is packaged and circulated to the market, the mechanical properties of the straw equipped with it will be tested, such as fragility and folding resistance. However, at present, all dairy factories use manual methods to detect the fragility and folding resistance of straws, which has a series of problems such as heavy workload of qua...Learn More