Method of and Apparatus for Cleaning Cylinders or Rolls
With a method of cleaning cylinders ( 5 ) and/or rolls ( 5 ), e.g., working rolls ( 5 ) in a rolling stand, which are used for producing a rolled stock ( 1 ) such as strips or slabs, wherein a liquid is sprayed onto the cylinders ( 5 ) at high pressure through several nozzles D 1 -Dn, a number of nozzles (D 1 -Dn) are stationary arranged in and/or on a nozzle beam ( 10 ), at least one on-off valve is associated with each nozzle (D 1 -Dn), and one or several nozzle(s) (D 1 -Dn) are sequentially switched on and off one after another starting from one end of the nozzle beam. The invention further relates to a corresponding apparatus.
1 . A method of cleaning cylinders ( 5 ) and/or rolls ( 5 ), e.g., working rolls ( 5 ) in a rolling stand, which are used for producing a rolled stock ( 1 ) such as strips or slabs, wherein a liquid is sprayed onto the cylinders ( 5 ) at high pressure through several nozzles D 1 -Dn,
characterized in that
a number of nozzles (D 1 -Dn) are stationary arranged in and/or on a nozzle beam ( 10 ), at least one on-off valve is associated with each nozzle (D 1 -Dn), and one or several nozzle(s) (D 1 -Dn) are sequentially switched on and off one after another, starting from one end of the nozzle beam.
2 . A method according to claim 1 ,
characterized in that
at a time, one nozzle (D 1 -Dn) is switched on.
3 . A method according to claim 1 ,
characterized in that
at a time, two adjacent nozzles (D 1 -Dn) are switched on.
4 . A method according to claim 1 ,
characterized in that
upon reaching an opposite and of the cylinder/roll, the following cleaning period starts immediately.
5 . A method according to claim 4 ,
characterized in that
the next cleaning period is carried out with a time delay.
6 . A method according to claim 1 ,
characterized in that
the nozzles (D 1 -Dn) are switched on dependent on a roll speed.
7 . An apparatus for cleaning cylinders and/or rolls, e.g., of working rolls in a rolling stand, which are used for producing a rolled stock such as strips or slabs, wherein several nozzles (D 1 -Dn) for spraying liquid at high pressure onto the cylinders ( 5 ) are provided,
characterized in that
at least one valve is associated with each nozzle (D 1 -Dn).
8 . An apparatus according to claim 7 ,
characterized in that
the nozzle (D 1 -Dn) is a rotary nozzle.
9 . An apparatus according to claim 7
characterized in that
the nozzle beam ( 10 ) is arranged above the rolled stock ( 1 ).
10 . An apparatus according to claim 7
characterized in that
the nozzle beam ( 10 ) is arranged beneath the rolled stock ( 1 ).
11 . An apparatus according claim 7
characterized in that
the nozzle beam ( 10 ) has a greater length as the cylinder or roll ( 5 ).
12 . An apparatus according to claim 7
characterized in that
the nozzles (D 1 -Dn) are arranged with offset in two parallel rows.
13 . An apparatus according to claim 7
characterized in that
supply of nozzles (D 1 -Dn) is carried out centrally through a fluid pressure conduit.
14 . An apparatus according to claim 7
characterized in that
on the nozzle beam ( 10 ), cover devices are secured.
15 . An apparatus according to claim 13 ,
characterized in that
several nozzles (D 1 -Dn), in particular arranged next to each other nozzles (D 1 -Dn), are brought in an open communication with the liquid pressure conduit by their associated valves at the same time.
16 . An apparatus according to claim 7
characterized by
a control unit for periodical or sequential control of the valves according to the magnitude predetermined cleaning periods.
17 . An apparatus according to claim 7 ,
characterized by
a control unit for periodical or sequential control of the valves dependent on the cylinder speed.