| 摘要 |
<p>PURPOSE:To reduce the loss of a raw material following the start and change of discharge amount by feed back controlling the speed of a geared pump so that the geared pump fore pressure forms the set pressure at the time of starting and changing the discharge amount and operating properly the speeds of a raw material feeder and an extruder. CONSTITUTION:At the time of starting, a third motor 8 is feed back controlled by a pressure controller 11 and a first motor 6 and a second motor 7 are so operated as to increase the number of rotations. Also, in the case of changing the discharge amount, feed back control is switched over to the third motor 8 and its set number of rotations is set as the number of rotations corresponding to the discharge amount to be changed. Then, the numbers of rotations of the first motor 6 and the second motor 7 are operated gradually so as to set the raw material feeding quantity and extrusion quantity corresponding to the discharge amount to be changed are set. The fore pressure of a geared pump is varied by operating the number of rotations of motors 6 and 7 as above, and the third motor 8 is fed back controlled corresponding to the variation. Thus the fore pressure of the geared pump is stabilized, and the geared pump 4 is controlled to the set number of rotations quickly and smoothly.</p> |
