TW367388B - System for the automatic movement of the end pipe of an arm distributing fluid concrete mixes and air, in machines for lining tunnel vaults
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System for the automatic movement of the end pipe of an arm distributing fluid concrete mixes and air, in machines for lining tunnel vaults
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System for performing automatic movement of the end pipe of the arm supplying fluid concrete mixes and air (shotcrete) in machines for lining tunnel vaults and the like, in which electrohydraulic actuators for the movements of the pipe are controlled by sending to them electrical commands in the form of square-wave signals with a variable frequency and in appropriate sequences, a signal being provided for each type of desired movement.
TW087120114A1997-10-151998-12-03System for the automatic movement of the end pipe of an arm distributing fluid concrete mixes and air, in machines for lining tunnel vaults
TW367388B
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