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US 6,128,934 AGranted
Stretch reduction mill
AssigneeLone Star Technologies, Inc.
InventorDavid W. Houghton
Life of this patent
Estimating the term…
Abstract
A method and apparatus that provides a multiple-stand stretch reduction mill. A single master controller monitors and controls the roll speed at each roll stand in the mill, automatically and simultaneously maintaining each stand's roll speed at a pre-determined, calculated roll speed.
Claims22
A system that monitors and controls the roll speed of each roll stand in a plurality of roll stands in a tube reducing mill, comprising:
- a plurality of roll stands;
- at least one AC electric motor for driving said roll stands;
- a plurality of drives, one of each said plurality of drives coupling said at least one AC motor to one of each said roll stands;
- a master controller, said master controller coupled to each individual roll stand of said plurality of roll stands, that monitors and controls the roll speed of said individual roll stands of said purality of roll stands;
- a computer that calculates a desired roll speed for each said roll stand of said plurality of roll stands and transmits to said master controller a signal corresponding to said desired roll speed;
- a plurality of speed control motors, each speed control motor of said plurality of speed control motors coupled to a single drive and coupled to said master controller;
- a plurality of speed pickups, one of each speed pickup of said plurality of said speed pickups coupled to a single roll stand, wherein said speed pickups measure the roll speed of each roll stand and transmit a signal corresponding to said measured roll speed to said master controller;
- and
- a plurality of stand controllers, each stand controller of said plurality of stand controllers coupled to said speed control motor and said master controller, each said stand controller receives a reference signal from said master controller, said reference signal corresponds to a desired motor speed.
6 more elements
An apparatus that monitors and controls the roll speed of each roll stand in a plurality of roll stands in a tube reducing mill, comprising:
- a plurality of roll stands;
- at least one motor for driving said roll stands;
- a plurality of drives, one of each said plurality of drives coupling said at least one motor to one of each said roll stands;
- a master controller, said master controller coupled to each individual roll stand of said plurality of roll stands, that monitors and controls the roll speed of said individual roll stands of said plurality of roll stands;
- a computer that calculates a desired roll speed for each said roll stand of said plurality of roll stands and transmits to said master controller a signal corresponding to said desired roll speed;
- a plurality of speed control motors, each speed control motor of said plurality of speed control motors coupled to a single drive and coupled to said master controller;
- a plurality of speed pickups, one of each speed pickup of said plurality of said speed pickups coupled to a single roll stand, wherein said speed pickups measure the roll speed of each roll stand and transmit a signal corresponding to said measured roll speed to said master controller;
- and
- a plurality of stand controllers, each stand controller of said plurality of stand controllers coupled to said speed control motor and said master controller, each said stand controller receives a reference signal from said master controller, said reference signal corresponds to a desired motor speed.
6 more elements
A method that provides a system that monitors and controls the roll speed of each roll stand in a plurality of roll stands in a tube reducing mill, comprising:
- providing a plurality of roll stands;
- providing at least one AC electric motor for driving said roll stands;
- providing a plurality of drives, each said drive coupling said at least one AC motor to one of each said roll stands;
- coupling a master controller to each individual roll stand of said plurality of roll stands, wherein said master controller monitors and controls the roll speed of said individual roll stands of said plurality of roll stands;
- providing a computer that calculates a desired roll speed for each said roll stand of said plurality of roll stands and transmits to said master controller a signal corresponding to said desired roll speed;
- providing a plurality of speed control motors;
- coupling each speed control motor of said plurality of speed control motors to a single individual drive;
- coupling one of each speed control motor of said plurality of speed control motors to said master controller;
- providing a plurality of speed pickups;
- coupling each speed pickup of said plurality of said speed pickups to a single individual roll stand, wherein said speed pickups measure the roll speed of each roll stand and transmit a signal corresponding to said measured roll speed to said master controller;
- and
- providing a plurality of stand controllers, wherein each said stand controller of said plurality of stand controllers is coupled to said speed control motor and to said master controller, wherein each said stand controller receives from said master controller a reference signal that corresponds to a desired motor speed.
9 more elements
A method that uses a master controller that monitors and controls the roll speed of each roll stand in a plurality of roll stands in a tube reducing mill, comprising:
- providing a plurality of roll stands;
- providing at least one AC electric motor for driving said roll stands;
- providing a plurality of drives, each said drive coupling said at least one AC motor to one of each said roll stands;
- monitoring and controlling the roll speed of each individual roll stand of said plurality of roll stands with a master controller, said master controller coupled to each said individual roll stand of said plurality of roll stands;
- calculating a desired roll speed for each said roll stand of said plurality of roll stands;
- transmitting to said master controller a signal corresponding to said desired roll speed;
- providing a plurality of speed control motors;
- coupling each speed control motor of said plurality of speed control motors to a single individual drive;
- coupling each speed control motor of said plurality of speed control motors to said master controller;
- providing a plurality of speed pickups;
- coupling each speed pickup of said plurality of said speed pickups to a single individual roll stand, wherein said speed pickups measure the roll speed of each roll stand and transmit a signal corresponding to said measured roll speed to said master controller;
- providing a plurality of stand controllers;
- and
- coupling each stand controller of said plurality of stand controllers to said speed control motor in a closed loop feedback manner and to said master controller, wherein each said stand controller receives from said master controller a reference signal that corresponds to a desired motor speed.
11 more elements
A programmable storage device, readable by a machine, tangibly embodying a program of instructions executable by the machine to perform a method that uses a master controller to monitor and control the roll speed of each roll stand in a plurality of roll stands in a tube reducing mill, comprising:
- providing a plurality of roll stands;
- providing at least one AC electric motor for driving said roll stands;
- providing a plurality of drives, each said drive coupling said at least one AC motor to one of each said roll stands;
- monitoring and controlling the roll speed of each individual roll stand of said plurality of roll stands with a master controller, said master controller coupled to each said individual roll stand of said plurality of roll stands;
- calculating a desired roll speed for each said roll stand of said plurality of roll stands;
- transmitting to said master controller a signal corresponding to said desired roll speed;
- providing a plurality of speed control motors;
- coupling each speed control motor of said plurality of speed control motors to a single individual drive;
- coupling each speed control motor of said plurality of speed control motors to said master controller;
- providing a plurality of speed pickups;
- coupling each speed pickup of said plurality of said speed pickups to a single individual roll stand, wherein said speed pickups measure the roll speed of each roll stand and transmit a signal corresponding to said measured roll speed to said master controller;
- providing a plurality of stand controllers;
- and
- coupling each stand controller of said plurality of stand controllers to said speed control motor and to said master controller, wherein each said stand controller receives from said master controller a reference signal that corresponds to a desired motor speed.
11 more elements
Dependencies are inferred from the claim text.