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Abstract(s)
Este trabalho é o resultado de um projeto realizado em parceria entre as empresas Teclena e Irmãos Tavares 2, na qualidade de fornecedor de soluções de óleo hidráulica e fabricante de equipamentos para apoio à construção civil, nomeadamente gruas.
Este projeto consiste no desenvolvimento de um novo modelo de grua designado por Luffing, com objetivo de conjugar soluções existentes com conceitos inovadores nesta área. Sendo que os focos do autor são a óleo hidráulica e automação, em especial a óleo hidráulica.
Para tal foi necessário conceber, projetar e fabricar um sistema de óleo hidráulica.
Composto por cilindro hidráulico, válvula de sustentação e grupo hidráulico de forma a cumprir à partida os requisitos impostos. No decorrer dos cálculos foi necessário recorrer a alterações no conceito da óleo hidráulica e automação.
De salientar que durante os ensaios foram encontradas algumas dificuldades/problemas no que respeita à falta de sensibildade nos movimentos de paragem e arranque, e na diferança entre os valores teóricos de forças necessárias/pressão e a realidade. Como forma de resolução foram alteradas e ensaiadas diferentes versões de válvula de sustentação.
Foi ainda necessário proceder ao projeto e consequente fabrico de uma nova válvula de sustentação especialmente para esta aplicação.
De frisar que a tomada de decisão por um sistema de óleo hidráulica se revelou acertada, fruto disso foi a excelente aceitação por parte do Mercado.
This work is the result of a project carried out in partnership between the companies Teclena and Irmãos Tavares 2, as supplier of hydraulic oil solutions and manufacturer of equipment to support the civil construction, namely cranes. This project consists in the development of a new crane model called Luffing, aiming to combine existing solutions with innovative concepts in this area. Since the author's philosophy is hydraulic oil and automation, especially hydraulic oil. For this it was necessary to conceive, design and manufacture a hydraulic oil system. Composed of hydraulic cylinder, counterbalance valve and hydraulic group in order to comply with the requirements imposed. During the calculations it was necessary to resort to changes in the concept of hydraulic oil and automation. It should be noted that during the tests some difficulties / problems were found egarding the lack of sensitivity in the stop and start movements, and in the difference between the theoretical values of necessary forces / pressure and reality. As kind of resolution, different versions of the counter balance valve were changed and tested. It was also necessary to precede the design and consequent manufacture of a new counterbalance valve especially for this application. It should be stressed that the decision-making by a hydraulic oil system proved to be correct, as a result of this was the excellent acceptance on the part of the market.
This work is the result of a project carried out in partnership between the companies Teclena and Irmãos Tavares 2, as supplier of hydraulic oil solutions and manufacturer of equipment to support the civil construction, namely cranes. This project consists in the development of a new crane model called Luffing, aiming to combine existing solutions with innovative concepts in this area. Since the author's philosophy is hydraulic oil and automation, especially hydraulic oil. For this it was necessary to conceive, design and manufacture a hydraulic oil system. Composed of hydraulic cylinder, counterbalance valve and hydraulic group in order to comply with the requirements imposed. During the calculations it was necessary to resort to changes in the concept of hydraulic oil and automation. It should be noted that during the tests some difficulties / problems were found egarding the lack of sensitivity in the stop and start movements, and in the difference between the theoretical values of necessary forces / pressure and reality. As kind of resolution, different versions of the counter balance valve were changed and tested. It was also necessary to precede the design and consequent manufacture of a new counterbalance valve especially for this application. It should be stressed that the decision-making by a hydraulic oil system proved to be correct, as a result of this was the excellent acceptance on the part of the market.
Description
Keywords
Grua Equipamento de elevação Luffing Óleo-hidráulica Grupo hidráulico Cilindro hidráulico Válvula sustentação Crane Lifting equipment Oil-Hydraulic Hydraulic System Hydraulic Cylinder Counterbalance Valve