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Grapple for logs
Bubník, Tomáš ; Mergl, Václav (referee) ; Kašpárek, Jaroslav (advisor)
The presented work deals with the design of a collet grapple for handling wooden logs and lumber. The work contains a research part of current versions of grabs from both Czech and international companies. It discusses the methods of performing the most used variants of the kinematics of the collet movement, the description of individual technical components and their functions. In the construction part, the work deals with the choice of suitable materials and electrodes, the design of the dimensional parameters of the grapple, the design of a double-acting linear hydraulic motor, sliding and joint bearings and supporting shafts forming rotational connections, a tie rod loaded for buckling and tension, a hydraulic rotator and the design of suitable dimensional parameters of the claws of the collet. An unloading set consisting of a hydraulic arm and an unloading hoist is designed for the grab, for which a stability check is carried out. The result of the work is a functional collet grapple made of high-strength steel for handling wooden logs of smaller weight.
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