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Advisor(s)
Abstract(s)
As evoluções tecnológicas contribuem para a conceção de máquinas e de equipamentos hidráulicos cada vez mais precisos, culminando em processos de automatização que aliam perfeição, segurança e qualidade. Com as válvulas proporcionais hidráulicas é possível controlar a velocidade, força, aceleração e quaisquer condições dos movimentos impulsionados por este género de energia, o que proporciona eficiência máxima do sistema e consequentemente melhor produtividade. Esta dissertação descreve a implementação de uma interface gráfica, que foi desenvolvida no Laboratório de Automação e Robótica Industrial (LARI) do ISEP para controlo de válvulas direcionais proporcionais hidráulicas existente nas bancadas de simulação de óleo-hidráulica. A interface ao interagir com um autómato programável Siemens S7/200 permite a visualização/alteração de parâmetros no autómato programável, de acordo com as necessidades do utilizador. Este trabalho pretende ser um contributo para o ensino prático das caraterísticas da hidráulica proporcional, para demonstrar aos alunos as várias caraterísticas e comportamentos destes sistemas, através do desenvolvimento de um conjunto de exercícios didáticos automatizados em bancadas óleo-hidráulicas. Comecei por efetuar o estudo das características das válvulas existentes na indústria e no ISEP, a seguir fez-se a análise dos meios de comando, características do autómato, consola e bancadas óleo-hidráulicas, após a análise, desenvolveram-se 2 conjuntos de exercícios, 1 conjunto para a válvula direcional proporcional Bosch Rexroth e outro para a válvula direcional proporcional da Vickers, para demonstração das potencialidades da hidráulica proporcional. Os exercícios automatizados envolvem sequências de ações programadas, como a programação de movimentos, cálculo de variáveis e leitura. Foram realizados diversos ensaios para validar e demonstrar as capacidades dos diferentes exercícios.
The technological evolutions contribute to the design of machines and hydraulic equipment’s more and more precise, culminating in automation processes that combine perfection, safety and quality. With proportional hydraulic valves it is possible to control the speed, force, acceleration and any conditions of the movements driven by this kind of energy, which provides maximum efficiency of the system and consequently better productivity. This dissertation describes the implementation of a graphical interface, which was implemented in the ISEP LARI to control proportional hydraulic proportional valves in the oil-hydraulic simulation benches. The interface when interacting with a Siemens S7/ 200 Programmable Logic Controller allows the display/change of Programmable Logic Controller parameters according to the user's needs. This work intends to be a contribution to the practical teaching of the characteristics of proportional hydraulics, to demonstrate to the students the various characteristics and behaviors of these systems, through the development of a set of automated didactic exercises in the oil-hydraulic workbenches. In a first phase of the work, the study of the characteristics of the valves in the industry and in the ISEP was carried out, after which the analysis of the control means, characteristics of the automaton, Human Machine Interface and oil-hydraulic benches were analyzed. 2 sets of exercises, 1 set for Bosch Rexroth proportional directional valve and one for Vickers proportional directional valve, to demonstrate the proportional hydraulics potential. Automated exercises involve sequences of programmed actions, such as motion programming, variable calculation, and reading. Several tests were carried out to validate and demonstrate the capabilities of the different exercises.
The technological evolutions contribute to the design of machines and hydraulic equipment’s more and more precise, culminating in automation processes that combine perfection, safety and quality. With proportional hydraulic valves it is possible to control the speed, force, acceleration and any conditions of the movements driven by this kind of energy, which provides maximum efficiency of the system and consequently better productivity. This dissertation describes the implementation of a graphical interface, which was implemented in the ISEP LARI to control proportional hydraulic proportional valves in the oil-hydraulic simulation benches. The interface when interacting with a Siemens S7/ 200 Programmable Logic Controller allows the display/change of Programmable Logic Controller parameters according to the user's needs. This work intends to be a contribution to the practical teaching of the characteristics of proportional hydraulics, to demonstrate to the students the various characteristics and behaviors of these systems, through the development of a set of automated didactic exercises in the oil-hydraulic workbenches. In a first phase of the work, the study of the characteristics of the valves in the industry and in the ISEP was carried out, after which the analysis of the control means, characteristics of the automaton, Human Machine Interface and oil-hydraulic benches were analyzed. 2 sets of exercises, 1 set for Bosch Rexroth proportional directional valve and one for Vickers proportional directional valve, to demonstrate the proportional hydraulics potential. Automated exercises involve sequences of programmed actions, such as motion programming, variable calculation, and reading. Several tests were carried out to validate and demonstrate the capabilities of the different exercises.
Description
Keywords
Válvula direcional proporcional Automação Autómato Consola Bancada didática Óleohidráulica Proportional directional valve Automation Programmable logic controller Human machine interface Didactic bench Oil-hydraulic