Abstract: Apparatus to lay cables, comprising a work unit bearing at least a pair of capstans to support the cables and provided with a safety device cooperating with the pair of capstans; a winding and unwinding unit for the cables, provided with a dynamic braking device cooperating with a reel for winding and unwinding the cables; an adjustment and safety hydraulic circuit in which a work fluid flows and with which the following are associated: a first power transmission unit to transmit power to the work unit and to pump the work fluid toward the safety device and toward said dynamic braking device, a second motorized braking unit of the work unit cooperating with a third command unit of the safety device, and a fourth regulation unit to regulate the winding and unwinding unit comprising at least a motorized counter-traction valve of the winding and unwinding unit and cooperating with said power transmission unit.

Abstract: Unit for winding and unwinding cables of a cable-laying apparatus, comprising a reel to support the cables to be wound or unwound, a support frame configured to keep said reel in a raised position with respect to the ground, and a rotation shaft solid with the reel and associated with a corresponding hydraulic drive unit; the unit also comprises at least a dynamic braking device associated with the rotation shaft and configured to allow, according to a first operating mode, the normal rotation of the shaft and therefore of the reel for winding or unwinding the cables, and to exert on the shaft and therefore on the reel, according to another operating mode, a dynamic braking condition that allows the shaft to rotate in a braked configuration for at least a certain period of time and prevents the instantaneous stoppage of the rotation of the reel.

Abstract: Apparatus to lay cables, comprising a work unit bearing at least a pair of capstans to support the cables and provided with a safety device cooperating with the pair of capstans; a winding and unwinding unit for the cables, provided with a dynamic braking device cooperating with a reel for winding and unwinding the cables; an adjustment and safety hydraulic circuit in which a work fluid flows and with which the following are associated: a first power transmission unit to transmit power to the work unit and to pump the work fluid toward the safety device and toward said dynamic braking device, a second motorized braking unit of the work unit cooperating with a third command unit of the safety device, and a fourth regulation unit to regulate the winding and unwinding unit comprising at least a motorized counter-traction valve of the winding and unwinding unit and cooperating with said power transmission unit.

Abstract: Unit for winding and unwinding cables of a cable-laying apparatus, comprising a reel to support the cables to be wound or unwound, a support frame configured to keep said reel in a raised position with respect to the ground, and a rotation shaft solid with the reel and associated with a corresponding hydraulic drive unit; the unit also comprises at least a dynamic braking device associated with the rotation shaft and configured to allow, according to a first operating mode, the normal rotation of the shaft and therefore of the reel for winding or unwinding the cables, and to exert on the shaft and therefore on the reel, according to another operating mode, a dynamic braking condition that allows the shaft to rotate in a braked configuration for at least a certain period of time and prevents the instantaneous stoppage of the rotation of the reel.

Abstract: A method for stretching cables includes the steps of i) providing at least one first and one second stretching device; the first and second stretching device include at least one rotatable drum on which a cable can be wound or unwound; an electrical movement member associated to the drum for winding the cable; supply means connected to the movement member; a braking device associated to the drum and activatable for unwinding the cable; an energy recovery member associated to the drum and active simultaneously with the braking device for recovering energy during the unwinding of the cable; ii) activating the second stretching device for pulling the cable; iii) recovering energy from the first stretching device during the unwinding of the cable; and iv) transferring at least part of the recovered energy from the first stretching device to the second stretching device.

Abstract: A method for stretching cables includes the steps of i) providing at least one first and one second stretching device; the first and second stretching device include at least one rotatable drum on which a cable can be wound or unwound; an electrical movement member associated to the drum for winding the cable; supply means connected to the movement member; a braking device associated to the drum and activatable for unwinding the cable; an energy recovery member associated to the drum and active simultaneously with the braking device for recovering energy during the unwinding of the cable; ii) activating the second stretching device for pulling the cable; iii) recovering energy from the first stretching device during the unwinding of the cable; and iv) transferring at least part of the recovered energy from the first stretching device to the second stretching device.