Patent ID: 9696090
Date: 2017-07-04
CPC Classifications: C21D,F27B,F27D

Claim:
1. A thermal processing furnace for workpieces having a blowing hood in which a nozzle is installed, the nozzle blowing a gas flow to thermally process a workpiece, comprising: a driving mechanism that adjusts a distance between the nozzle and a portion of the workpiece facing the nozzle so that the gas flow blown from the nozzle impinges on workpieces of various dimensions at a desired flow velocity, a controller to which a dimension of the workpiece is input, the controller connected to the driving mechanism, and outputting the dimension of the workpiece to control the driving mechanism, and a sensor that automatically detects the dimension of the workpiece in advance, and inputs the dimension to the controller, wherein a plurality of nozzles are arranged as the nozzle along a conveying direction of the workpiece in a zone where the thermal processing is performed, and the driving mechanism adjusts a distance between each of the nozzles and a portion of the workpiece facing the nozzle individually in each of the plurality of nozzles.