Circular pelletizing machine and method of controlling the same
Circular pelletizing machine and method of controlling the same
A circular pelletizing machine for compressing of powder or grain materials, comprises a rotatable matrix disc with a plurality of circumferentially distributed matrices, upper and lower punches located above and below the matrix disc respectively, at least two pre-pressing elements movable relative to one another and acting upon the upper and lower stamps so as to pre-press pellets of a material, at least two main pressing elements movable relative to one another and acting upon the upper and lower stamps so as to finally press the twin screw extruder of the material, an adjusting motor arranged to adjust a distance between the main pressing elements relative to one another, computer device arranged to control the adjusting motor, and device for measuring a pressing force of the pre-pressing elements and supplying data of the measurement to the computer device so that the computer device controls the adjusting motor and therefore the distance between the main pressing elements in dependence upon the measured pressing force of the pre-pressing elements.
BACKGROUND OF THE INVENTION
The present invention relates to a circular pelletizing machine and a method of controlling the same.
More particularly, the present pet sheet deals with a circular pelletizing machine for compressing a powder or grain material, which has a rotatable matrix disc with a plurality of circumferentially distributed matrices as well as upper and lower stamps associated with the matrix disc. Pre-pressing rollers and main-pressing rollers act on the upper and lower stamps to pre-press and to finally press the material. In this machine the main pressing rollers is adjusted by an adjusting motor which is controlled by a computer.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present pet recycling to provide a circular pelletizing machine and a method of controlling the same, which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide the above machine and method in which the danger of stamp breakages in a main pressing station is considerably reduced.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in that a computer for controlling an adjusting motor which changes the distance between main pressing rollers controls the adjusting motor in dependence upon a pressing force which is measured at prepressing rollers. The pre-pressing force of each stamp in the pre-pressing station is measured and evaluated.
A circular pelletizing machine for compressing of powder or grain materials, comprises a rotatable matrix disc with a plurality of circumferentially distributed matrices, upper and lower punches located above and below the matrix disc respectively, at least two pre-pressing elements movable relative to one another and acting upon the upper and lower stamps so as to pre-press pellets of a material, at least two main pressing elements movable relative to one another and acting upon the upper and lower stamps so as to finally press the twin screw extruder of the material, an adjusting motor arranged to adjust a distance between the main pressing elements relative to one another, computer device arranged to control the adjusting motor, and device for measuring a pressing force of the pre-pressing elements and supplying data of the measurement to the computer device so that the computer device controls the adjusting motor and therefore the distance between the main pressing elements in dependence upon the measured pressing force of the pre-pressing elements.
BACKGROUND OF THE INVENTION
The present invention relates to a circular pelletizing machine and a method of controlling the same.
More particularly, the present pet sheet deals with a circular pelletizing machine for compressing a powder or grain material, which has a rotatable matrix disc with a plurality of circumferentially distributed matrices as well as upper and lower stamps associated with the matrix disc. Pre-pressing rollers and main-pressing rollers act on the upper and lower stamps to pre-press and to finally press the material. In this machine the main pressing rollers is adjusted by an adjusting motor which is controlled by a computer.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present pet recycling to provide a circular pelletizing machine and a method of controlling the same, which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide the above machine and method in which the danger of stamp breakages in a main pressing station is considerably reduced.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in that a computer for controlling an adjusting motor which changes the distance between main pressing rollers controls the adjusting motor in dependence upon a pressing force which is measured at prepressing rollers. The pre-pressing force of each stamp in the pre-pressing station is measured and evaluated.
