Method and control apparatus for separating the rolls of a calen

Details Method and control apparatus for separating the rolls of a calen Method and control apparatus for separating the rolls of a calen

1987-02-13

1988-01-26

Stodola, Daniel P.

Presses

Automatic or material triggered control

Of roll separation or speed

100163R, 72245, 29113AD, B30B 1516, B21B 3132

Patent

active

047210397

ABSTRACT:
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.

REFERENCES:
patent: 3777656 (1973-12-01), Muller
patent: 4154160 (1979-05-01), Kusters
patent: 4290351 (1981-09-01), Pav et al.
patent: 4347784 (1982-09-01), Pav et al.
patent: 4380954 (1983-04-01), Edele
patent: 4389933 (1983-06-01), Pav
patent: 4481799 (1984-11-01), Glattfelder et al.

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