Patent ID: 9694404
Date: 2017-07-04
CPC Classifications: B21B,B21D

Claim:
1. A straightening device for long or rod-shaped metal products, comprising a bearing structure, a vertically movable lower roll unit within the beating structure, a vertically movable upper roll unit above the lower roll unit and within the bearing structure, a safety and control device configured to detect the overload condition of the lower roll unit, and a hydraulic device under the lower roll unit, comprising a fixed part coupled to the bearing structure, a mobile part having a support, wherein the support is coupled to the lower roll unit, a fixed striker plate disposed between the fixed part and the lower roll unit, and a chamber flexibly formed by an upper face of the fixed part and a bottom face of the mobile part and capable of being selectively filled and emptied, wherein the fixed part and the striker plate define a cavity at an outside of the mobile part, the mobile part includes an abutment tooth disposed outside the chamber, wherein the abutment tooth is vertically moveable within the cavity to contact the striker plate to limit the maximum raised position of the chamber during filling and to stabilize the lower roll unit at its maximum raised operating position during normal operation of the straightening device, wherein the hydraulic device is a single-effect hydraulic actuator that is functionally associated with the safety and control device, wherein the lower roll unit is only vertically movable by the hydraulic device.