Calender sheeting thickness correction control system
阅读：80发布：2022-08-04
专利汇可以提供Calender sheeting thickness correction control system专利检索，专利查询，专利分析的服务。并且There is disclosed an automatic control system for maintaining the thickness of a multilayer or multilaminae flowsheet of rubber or plastic material. The system includes a plurality of screwdown motors for controlling calender roll separation and a plurality of selsyn systems responsive to screwdown movement and connected in a feedback control system to selectively deenergize the screwdown motors to control correction of laminae thickness. The laminae thickness feedback control system is operable with a beta gauge sheet thickness maintenance control, where the latter control operates to maintain total sheet thickness at a predetermined value.，下面是Calender sheeting thickness correction control system专利的具体信息内容。
1. In a sheeting calender apparatus including at least first and second sets of calender rolls, first screwdown means to control the separation between the rolls of said first set of calender rolls, second screwdown means for controlling the separation between the rolls of said second set of calender rolls, thickness-measuring means including first circuit means automatically responsive to deviations from a Desired normal in the thickness of said sheet for operating the said screwdown means to adjust the separation between the rolls of said sets to thereby correct the thickness of the sheet, the improvement including: means monitoring the operation of each of said screwdown means to generate output signals indicative of a differential in the operation of said first screwdown means and the operation of said second screwdown means; and, second circuit means connected to said first circuit means and responsive to said output signals for selectively operating either of said screwdown means so as to eliminate the differential.
2. The apparatus of claim 1 wherein each screwdown means includes a drive side screwdown motor for controlling the separation between rolls on one end and a waterside screwdown motor for controlling the separation between rolls on the other end, and wherein said monitoring means includes signal generator means for each of said screwdown motors and responsive thereto for providing signals representative of the movement of said motors, and output signal generator means responsive to a differential output from the signal generator means associated with drive side screwdown motors for producing a first output signal to said second circuit means and responsive to a differential output from the signal generators associated with waterside screwdown motors for producing a second output signal to said second circuit means, said second circuit means being responsive to said first and second output signals respectively to selectively deenergize the screwdown motors.
3. The apparatus of claim 2 wherein each signal generator means comprises a selsyn transmitter and wherein said output signal generator means includes a first pair of opposed selsyn receivers for operating a drive side control means and a second pair of opposed selsyn receivers for operating a waterside control means.
4. The apparatus of claim 3 wherein each control means comprises a mechanical differential coupled to said selsyns and having an output operator positioned so as to operate a pair of switches.
6. In a laminar sheet producing apparatus provided with two sets of calender sheeting rolls, each set of rolls producing a lamina of said sheet and being adjustable by individually controllable screwdown devices operatively connected to each end of each set of rolls, and the apparatus including laminar sheet thickness correction means providing control signals simultaneously to screwdown devices located on the same sides of said sets of rolls to adjust the devices so as to maintain a predetermined total thickness of the laminar sheet on one side and providing control signals sequentially to the screwdown devices on the opposite sides of the sets of rolls to adjust the devices so as to maintain a predetermined total thickness of the laminar sheet on its other side the improvement which includes: first and second sets of signal generators each set being located on opposite sides of said sets of rolls and providing output signals representative of the movement of the screwdown devices, differential means connected to said sets of signal generators and responsive to said output signals for providing laminae thickness correction control signals; and, circuit means operable with said laminar thickness correction means and responsive to said laminae thickness correction control signals for selectively controlling said screwdown devices to control correction of laminae thickness.
7. Apparatus according to claim 6 wherein each signal generator comprises a selsyn system and wherein said differential means comprises at least two mechanical differentials and switching means operable by two selsyn systems such that the switching means provides said laminae thickness correction control signals.
8. Apparatus according to claim 6 wherein said circuit means includes relays operable upon receipt of a laminae thickness correction control signal to deenergize a screwdoWn device so long as the signal persists and capable of restarting the screwdown device upon removal of the signal.
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