Polia com pino aperfeiçoado para sustentar fios para máquina de corte de vários fios de blocos

It is a pulley (1) with an improved pin, comprising: a hub (3) into which the outer ring (11) of a bearing (12) is keyed; a rotating bearing pin housed within the bearing inner ring (13); protective mazes housed between pin and hub for bearing protection; a circumferential groove (6) which is circumferential with respect to the outer diameter of the pulley (1) in which a shaped liner (7) is housed for contact with diamond wire (8); the pulley hub being manufactured in two pieces (9, 10) which are stably tightened over the inner diameter of the pulley (1); Moreover, each outer surface (18) of the hub is provided with an annular labyrinth (17) which is mutually penetrable with an annular labyrinth (16) present on each inner surface of a detachable pin (2) made of two pieces (14). , 15) and axially tightened by a detachable connecting member (19), and having the connection between the improved pin (2) and the pulley support (20) effected by means of clamping elements (26). ) and guide elements (25) inserted in a direction parallel to the pulley arrangement plane at the thickness of the walls (29, 30) of the support itself. Specific advantages of construction and assembly of the pin (2) parts, improved pin fixing on the bracket (20) and external configuration of the pin (2) are described herein to facilitate interlocking between the pulleys and the wires in the machine. multi-threaded to cut stone blocks.