| 摘要 |
Metal strip reducing rolls are precisely cooled in multiple zones across the width of the strip by the selective activity of modular valve assemblies on coolant headers mounted near the reducing rolls. Each valve module may possess one or more remotely controllable coolant control valves within the header and associated coolant nozzles whose aperture sizes may vary in a fixed ratio within each zone to achieve a variable coolant flow rate in each zone while maintaining a constant unchanging coolant spray configuration and impingement force. Individual coolant valves and nozzles in a digital control system are fully on or fully off in contrast to gradient control of coolant in an analog system. An observer of the moving metal strip activates and deactivates selected nozzles in selected zones across the strip through a push button digital control console. Electrical, pneumatic or hydraulic valve control may be utilized. Back-up rolls in the mill may also be cooled.
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