A new designed hot-line work robot for sweeping post insulators at high-voltage

Che, Lu; Gu, Youlin; Yang, Renxin

doi:10.1007/s00170-005-2601-5

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…17,18 Because the Zn rich eutectic g phase existed in the secondarily solidified structures and the atom diffusion in solid state was very limited, the composition distribution was not completely uniform although the alloy had been solution treated for 48 h at 360uC. The Zn concentration in the b phase from the secondarily solidified structures was still higher than that from the primary particles.…”

Section: Resultsmentioning

confidence: 99%

Effects of quench aging treatment on microstructure and tensile properties of thixoformed ZA27 alloy

Chen¹,

Yuan²,

Li³

2007

Materials Science and Technology

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The effects of quench aging heat treatment on microstructure and tensile properties of thixoformed ZA27 alloy were investigated. The results indicated that the microstructure of the alloy became into polygonal b phase particles after solid solution treatment at 350uC for 48 h. The b particles then decomposed into a and g phases which would coarsen during the subsequent aging at 150uC. It was observed that the Zn concentration in the b phase near the polygonal boundaries was higher than that within the b particles. As a consequence, both the decomposition speed of the former b phase and the subsequent coarsening speed were faster than those of the latter b phase. Thus, a and g phases near the boundaries were always coarser than those within the particles during aging. Owing to the coarsening, the ultimate tensile strength continuously decreased with increasing aging time. The percentage elongation increased up to 10 h, but decreased with aging time owing to bad deformation accommodation and low bonding strength between particles. Cracks initiated from some defects (e.g. inclusions and porosities) during tensile test, and the path for the cracks to propagation changed with the aging time.

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Section: Resultsmentioning

confidence: 99%

Effects of quench aging treatment on microstructure and tensile properties of thixoformed ZA27 alloy

Chen¹,

Yuan²,

Li³

2007

Materials Science and Technology

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“…Com os avanços na robótica, a tendência é, cada vez mais, a utilização de dispositivos robóticos para auxiliar ou substituir os eletricistas. Embora a completa substituição dos profissionais de campo apresente uma complexidade muito grande, protótipos de robôs telecomandados já foram construídos, apresentando resultados promissores (ARACIL et al, 2002;CHE;GU;YANG, 2006;NIO;MARUYAMA,1993).…”

Section: Manipuladoresunclassified

Precisão em posicionamento de manipulador não condutor acionado por músculos artificiais pneumáticos.

Scaff¹

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With the population growth and the evergrowing energy dependency, the contemporary society have been facing new challenges to maintain yourself. The use of robotics in various fields is each time more common, contributing to surpass these new challenges. However, there are still cases where applying conventional robotics is prohibitive, such as in high electric and magnetic field environments, found, for example, in electric energy distribution systems and in magnetic resonance imaging machines. That's because conductive and ferromagnetic components can cause serious problems, like burns, shortcuts and even be throwed at high velocities. Knowing these difficulties, this work proposes the construction of a robotic manipulator capable of acting in these high electric and magnetic field environments. To build such manipulator, however, it's necessary to study the mechanic structure, the actuators, the sensors and the controller. In the case of the mechanic structure and sensors, there exists non-conductive and non-magnetic alternatives available. The controller is, in general, a microcomputer or an electric device, therefore, conductive. One alternative is to keep the controller far away from the risk environment. But to test this hypothesis, it's necessary to have a non-conductive and non-ferromagnetic actuator. Because of that, this work proposes the construction of an actuator free of conductive and magnetic materials, based on the McKibben pneumatic artificial muscle. Pneumatic artificial muscles are available commercially, but they have metallic components. Besides, the accurate control of these actuators is difficult for their high non-linearities. To verify the viability of applying artificial muscles on a non-conductive manipulator, tests were conducted with artificial muscle prototypes built with compatible materials. The design and dimensioning of the artificial muscle are covered. Finally, the PID controller is implemented to evaluate the muscle's controllability and its viability for tasks that need position accuracy.

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