Method and apparatus for controlling the pressure exerted on a material web in the roller nip of a rolling mill
AssigneeKleinewefers GmbH
InventorEugen Edele
Life of this patent
Estimating the term…
Abstract
Disclosed herein are a method and apparatus for the compression treatment of a material web in a calender or the like, wherein the pressure in the roller nip can be precisely set and regulated by the comparison between the set point value and the actual value of the pressure in the roller nip. The actual pressure is determined by a pressure measuring element mounted on a piston supported against the rollers of the calender or in the bearings of such a roller, taking into consideration the weight of the directly supported roller.
Claims12
A method for controlling the pressure exerted on a material web in the nip between two cooperating rollers of a rolling mill having a roller loading device, particularly a calender having a plurality of vertically stacked rollers, the lowermost of which is supported on at least one working cylinder which can be rapidly bled, comprising the steps of:
- a. measuring the support force supplied by said working cylinder;
- b. determining the actual value of the pressure exerted in the nip on the web, while taking into consideration the weight of said roller supported by said working cylinder;
- and
- c. eliminating the deviation between said actual value and a desired set point value by changing the force produced by the loading device.
A rolling mill, particularly a calender for the compression treatment of a material web, comprising:
- a. a plurality of stacked, horizontal rollers mounted in bearings at their respective ends and forming at least one roller nip, said rollers including a lowermost roller of predetermined weight;
- b. at least one working cylinder including at least one piston which supports the bearings of said lowermost roller;
- c. a pressure measuring element for transferring only the load from the lowermost roller to said piston;
- and
- d. means for regulating the pressure exerted on said material web in said roller nip, said regulating means including means for compensating for said predetermined weight of said lowermst roller.
A method for controlling the pressure on a material web in the nip between two cooperating rollers of a rolling mill having a roller loading device, particularly a calender having a plurality of vertically stacked rollers, the lowermost of which is supported by at least one working cylinder which can be rapidly bled, comprising the steps of:
- a. determining the weight of all of the plurality of vertically stacked rollers except the lowermost roller;
- b. measuring the force applied by said roller loading device to said plurality of vertically stacked rollers;
- c. determining the actual value of the pressure exerted in the nip on the web by adding the determined weight of all of the plurality of vertically stacked rollers except the lowermost roller to the measured force applied by said roller loading device;
- and
- d. eliminating the deviation between said actual value and a desired set point value by changing the force applied by said roller loading device.
A rolling mill, particularly a calender for the compression treatment of a material web, comprising:
- a. a plurality of stacked, horizontal rollers mounted in bearings at their respective ends and forming at least one roller nip;
- b. means for determining the weight of all of the plurality of stacked rollers except the lowermost roller;
- c. a pressure measuring element for sensing the load applied to the plurality of stacked rollers;
- and
- d. means for regulating the pressure exerted on said material web in said roller nip, taking into consideration the weight of the plurality of stacked rollers except the lowermost roller.
Dependencies are inferred from the claim text.