Method for slip regulation of a pellet mill and apparatus for carrying out the process
AssigneeBuhler AG
InventorWilli Wetzel
Life of this patent
Estimating the term…
Abstract
A pellet mill (1) is provided with a control unit with the help of which a desired value of press roll slippage, e.g. zero or a pre-selectable peak value can be maintained. For this purpose, the pellet mill (1) comprises a first measuring unit (27, 28) for measuring the circumferential speed of the perforated die (8) as well as a second measuring unit (23, 24) for measuring the circumferential speed of the press rolls (11, 12). In a comparator (30, 31), the two circumferential speeds are compared and on exceeding a pre-selectable peak value for the difference of the two measured values, a slip signal is created by means of which the mill drive, and/or the supply of basic material to be formed is influenced in such a manner that the slippage will be prevented.
Claims18
A method for operating a pallet mill of the type having at least one perforated die and at least one press roll forming a desire gap between its circumference and the die and cooperating with said die to press materials to be formed into pellets through the perforations of the die by providing a desired supply of material and a desired relative speed between said die said press roll, said method comprising the steps of
- determining the nominal speed the press roll should have on said die;
- determining the actual speed of the press roll;
- comparing the normal speed and the actual speed to determine any difference that may occur which constitutes a measure of slippage between said press roll and said die,
- generating a slippage signal when a difference of speed will occur of an actual valve beyond a predetermined value, and
- controlling one parameter of said pellet mill being selected from the group of the supply of material, the relative speed of said die and said press roll, and said gap in correspondance with said slippage signal so as to diminish said difference of speed so as to bring it down at least to said predetermined value.
A method for operating a pellet mill of the type having at least one perforated die and at least one press roll forming a desired gap between its circumference and the die and cooperating with said die to press material to be formed into pellets through the perforations of the die by providing a desired supply of material and a desired relative speed between said die and said press roll, said method comprising the step of
- controlling at least said gap and said relative speed of said die and said press roll, said relative speed being reduced with increasing gap.
Dependencies are inferred from the claim text.