A cooling and lubricating device for rollers of a cold rolling mill for strip having one or more roll stands for controlling tensile stress of the strip across the strip width by realizing at least one of a change of the effective roll barrel diameter and a change of the roller lubrication with a controlled supply of rolling oil or emulsions to the rollers, wherein the controlled supply is at least one of pressure-controlled, quantity-controlled, and temperature-controlled;
- the device comprising:
- several nozzle beams having a longitudinal axis and being assigned to individual rollers, respectively;
- the nozzle beams configured to be connected to side shields of a roll housing of the one or more roll stands;
- spray nozzles mounted in the nozzle beams so as to be distributed across an entire width of the rollers;
- the nozzle beams moveable relative to the correlated rollers and independently of one another transverse to a running direction of the strip running through the cold rolling mill and in planes positioned parallel to a plane of the strip;
- one or more rotary drives connected to the nozzle beams and configured to rotate the nozzle beams about the longitudinal axis;
- one or more linear drives connected to the nozzle beams and configured to move the nozzle beams in a direction of the longitudinal axis;
- positioning devices provided on the one or more roll stands and configured to move the nozzle beams from a maintenance position remote from the rollers to a working position near the rollers and from the working position into the maintenance position;
- wherein the control valves to be opened or closed are switched within a certain time frame with time delay;
- wherein the spray nozzles are mounted with equal spacing to one another in the nozzle beam and have a nozzle holder, respectively, wherein the nozzle beam has a front wall section facing the assigned roller and a rear wall section opposite the front wall section, wherein the front and rear wall sections have openings in which the nozzle holders are seal-tightly seated so as to penetrate an interior of the nozzle beam;
- wherein the nozzle holders have a forward end facing the assigned roller, respectively, and have a center throughbore;
- wherein the spray nozzles have a nozzle head, respectively, and the nozzle heads are connected to the forward ends;
- wherein the nozzle heads have at least one nozzle opening and an ante-chamber, respectively;
- wherein the spray nozzles have a rotary slide valve, respectively, supported in the center throughbore so as to be rotatable about a longitudinal axis of the spray nozzle;
- wherein the rotary slide valves have a blind bore, respectively, opening toward the nozzle heads, and further have at least one first inlet opening, respectively;
- wherein the nozzle holders or the nozzle heads have at least one second inlet opening, respectively, opening to an interior of the nozzle beam;
- wherein the at least one first inlet opening, in an open position of the spray nozzle, is aligned with the at least one second inlet opening and wherein the at least one first inlet opening, in the closed position of the spray nozzles, is covered by a wall of the nozzle holders or the nozzle heads;
- wherein the spray nozzles have a control member, respectively, connected to the rotary slide valves at an end of the rotary slide valves facing away from the nozzle heads.