The Research On The Floating Piezoelectric Vibratory Feeder

Currently, most of vibratory feeders in our country are electromagnetism type and machine type. They have many shortages, such as huge volume, hulking whole, complicated structure, huge workload of maintenance overhaul, inconveniently adjust, big noise and high cost. With fast development of the science technical, the new vibratory feeder that using the piezoelectric ceramics took the actuation source is becoming the focal point. However, the majority piezoelectric vibratory feeders that the automatic production lines using in our country are depend on import products. The research lies the beginning stage in our country. The research will benefit for our country vibration feeder domain, specially for the piezoelectric vibratory feeder domain. The research not only can enhance the technical level and strengthen the competition ability in the international market of piezoelectric vibratory feeder for our country, but also pursue the international technical development.A new kind of the floating piezoelectric vibratory feeder is designed in order to the current products'insufficiency. The main contents of this thesis are follows:1) In this thesis, the newest research work of the piezoelectric vibratory feeders is summarized; the characteristics of their structure and performance areanalysised; Contrasting with the similar products of in our country, both the merit of the floating piezoelectric vibratory feeder and the innovation of them are discussed.2) Research work of the floating piezoelectric vibratory feeder's theory.The thesis has introduced basic knowledge of the piezoelectricity ceramics, main structure of the floating piezoelectric vibratory feeder, its working theories about similar elliptic motion, destruction of physical equilibrium at rest and guide of geometrical structure and research methods for the tolerance of clearance movement principle of the floating foundation;3)Numerical analysis of the floating piezoelectric vibratory feeder.The thesis has made static analysis, mode analysis and response analysis to the installation by ANSYS analysis software, make sure the vibratory way of the vibratory component, working modes and response characteristics of the installation, and analysis the relations of the response curve and the vibratory mode. Discovered the working theory of installation and lay the theories foundation for the later experiment research.4)the experiment research of the floating piezoelectric vibratory feeder.1. Invention of control-system.Aiming at to experiment, we have invented fixed time feeding control-system and fixed amount feeding control-system that they could control start-up and stop automatically by Labview software.2. The experiment to feeding capacity.Neglects the secondary factors, such as the environment, the temperature and so on, The thesis has analysis the factors that affect feeding rate, they are the material type, the vibratory angle, the working voltage, the operating frequency,the height of the board that limits flows and the height of the material in the hopper. We found this installation hasn't obvious selectivity for the material type, the best vibration angle decrease with weight of the material's granule increasing, segment of the best working voltage is 50~85V, segment of the best operating frequency is 150~175HZ, and there are smaller influencing in the height of the board that limits flows and the height of the material in the hopper.3.Endurance experiment.In view of the installment durable performance, carries on the endurance experiment to this installation, discovered its working life decrease with input voltage increasing. When it work in best voltage, the piezoelectric piece can continuous working for above 80 hours.4. The experiment to precision of transports.The quality precision of this installation directly affects its applied scope, therefore made the experiment to test its precision and found the precision achieve 0.235%.5. The experiment to optimize structure.Piezoelectric piece's position and the size of vibration angle are the most importance factors to affect feeding rate,therefore optimize the installation on two factors. The thesis calculated the equation about two factors .5) The applied analysis of the floating piezoelectric vibratory feeder.This installation is possessed of many merit which a lot of domestic and foreign congener products don't have. Its application scope is extremely widespread, mainly may apply to micro- quantity and precision- quantity feeding, the variable feeding, the automatic product line, other machining equipment of the solid particle material.In summary, the floating piezoelectric vibratory feeder has many merits, such as simple structure, be prone to fix and maintain, low energy consumption, little noise, hasn't obvious selectivity for the material type, outdoes similar products 5~10 times in feeding rate, the cost is lower a half than similar products and so on. Furthermore its working reliability and feeding precision are excellent. Each performance index of this installation reached the anticipated design requirements by the experiments.The innovation of this thesis are:1) The thesis has invented the floating piezoelectric vibratory feeder, solved the bottleneck problem of automatic feeding for the dispersed material, has avoided to obvious selectivity for the material type, enhanced the feeding rate, solved the difficult problem that feeding big granule and small granule material.2) The thesis has invented the structure of floating foundation, thus eliminated the restraint which trough fixedly install to bring, reduces the energy consumption, and proposed the tolerance clearance movement principle.3) By the theoretical analysis and the experimental confirmation, the thesis proposed the working principle of trough——the similar elliptic motion, destruction of physical equilibrium at rest and guide of geometrical structure.