초록 ▼

The bottom roll of a roll stack in a calender is constructed as a controlled deflection roll equipped with a non-rotatable carrier or support beam and a roll shell rotatable about the non-rotatable carrier. The roll shell is supported on the non-rotatable carrier by means of hydraulic support or pre

The bottom roll of a roll stack in a calender is constructed as a controlled deflection roll equipped with a non-rotatable carrier or support beam and a roll shell rotatable about the non-rotatable carrier. The roll shell is supported on the non-rotatable carrier by means of hydraulic support or pressure elements. The non-rotatable carrier is supported with respect to the calender stand by means of hydraulic carrier support devices. For the rapid opening of the calender and to avoid damage to the roll shell, initially the pressure exerted on the roll shell support elements is reduced in a sudden manner and only after a predetermined time-delay is there reduced the pressure exerted on the carrier support devices. The time-delay is chosen such that the pressure peak occurring in the roll shell support elements due to the springing back or recovery of the non-rotatable carrier has dropped to a safe value and the risk of damage to the roll shell, such as would occur in the case of a simultaneous pressure drop, is avoided.

대표청구항 ▼

A method for separating the rolls of a calender containing a roll stand and equipped with a plurality of superimposed rolls, comprising the steps of: providing as one of the superimposed rolls a bottom roll having a non-rotatably mounted carrier which is substantially vertically movable by means of

A method for separating the rolls of a calender containing a roll stand and equipped with a plurality of superimposed rolls, comprising the steps of: providing as one of the superimposed rolls a bottom roll having a non-rotatably mounted carrier which is substantially vertically movable by means of hydraulic carrier support devices pressurizable by means of a pressurized medium and upon which non-rotatably mounted carrier there is supported by means of at least one hydraulic support element pressurizable by means of a pressurized medium a roll shell which is movable in substantially vertical direction; separating the rolls of the calender by lowering the pressure in the hydraulic carrier support devices and the pressure exerted upon the at least one hydraulic roll shell support element such that both said carrier and said hydraulic roll shell are moved substantially vertically downwards; and said step of lowering the pressure entails the initialization of the lowering of the pressure in the hydraulic carrier support devices with a predeterminate time-delay after the initialization of the lowering of the pressure exerted upon said at least one hydraulic roll shell support element.