Title of Invention

AN IMPROVED SYSTEM FOR OILING COLD ROLLED STEEL COILS

Abstract

An improved system for oiling cold rolled steel coils comprising a reservoir for storing the oil to be applied, pipe lines, pumps with motors, gate valves, a pressure relief valve with an oil return pipe line, an oil pressure gauge, a control panel containing duplex cartridge filters and solenoid control valves, and oil spray header containing a number of non-return type valves which are interlocked with the solenoid control valves through flexible hoses for controlling automatically the flow rate of oil through a number of flat-jet non-return type nozzles in accordance with the speed of movement of the coils through oil jets of the nozzles, the width of the oil jets being adjustable in accordance with the width of the surface of the coil.

Full Text

The present invention relates to an improved system for The invention relates more particularly to a low-cost and simple system for applying rust preventive oil on the surface of steel coils uniformly along the entire width thereof with reduced wastage of oil through spillage and non-uniform application. Hot rolled steel coils (i.e. flat steel strips of continuous length) produced in steel plants are first pickled in the continuous pickling line for removal of rusts and scales from the surface thereof, before carrying out the cold rolling operation thereon in the cold rolling mill. For preventing further formation of rusts and scales on the surface of cold rolled coils owing to the atmospheric effect, a layer of rust preventive oil is applied on the surface of cold rolled coils. In the existing system of applying rust preventive oil on the surface of cold rolled coils, the oil is stored in an overhead reservoir placed at a height of about 3m above the shop floor level and allowed to fall therefrom by gravity through a pipe into a spray header located at a height of about 1m from the shop floor level and to drip therefrom through a single hole of diameter of about 5 mm onto the surface of the coils at the central part thereof. For controlling the flow rate of oil a valve is provided in the pipe, which is preset , and is not controllable easily with the variation in the speed of the coils during the rolling operation. - 2 - The main drawbacks of the existing system for applying oil on the cold rolled coils are ;- (i) application of oil is non-uniform on the coil surface being maximum at the central part and minimum at the two edges thereof; . (ii) excessive spillage of oil during the holding and shearing operations performed on the coils, causing increased consumption of oil of about 0.8 litre/ton of coils cold rolled and also pollution of the environment in the shop; and (iii) contamination of the surface of the coils with dirts because of spraying the oil without prior filtering of the same. The object of the present invention is to provide an improved system Which is suitable for applying rust preventive oil on the surface of coils in a cold rolling mill uniformly over the entire surface thereof, for reducing wastage of oil through spillage and non-uniform application, and maintaining the surface of coils free from dirts. The invented system comprises basically a reservoir placed at the shop floor level for storing the oil to be applied; pumps with gate valves for transferring the oil to an oil spray header located at a height of about 022m - 0.3m above the coil surface through pipe lines fitted with pressure relief valve, filter, pressure gauge, solenoid control valves passing through a control cabinet, an oil spray header containing non-return type valves which are interlocked with the solenoid valves through flexible hoses for controlling the flow rate of oil through flat-jet non-return type nozzles in accordance with the speed of - 3 - movement of the coils through oil jets of the nozzles, the width of the oil jets being adjustable in accordance with the width of the surface of coils. Thus the invention provides an improved system for rolled stell.coils omprising a reservoir for storing the oil to toe applied, pipe lines, pumps with motors, gate valves, a pressure relief valve with an oil return pipe line, an oil pressure gauge, a control panel containing duplex cartridge filters and solenoid control valves, and oil spray header containing a number of non-return type valves which are interlocked with the solenoid control valves through flexible hoses for controlling automatically the flow rate of oil through a number of flat-jet non-return type nozzles in accordance with the speed of movement of the coils through oil jets of the nozzles, the width of the oil jets being adjustable in accordance with the width of the surface of the coils. The invention is described fully and particularly in an unrestrictive manner with reference to the accompanying drawings in which Figure 1 is a schematic block diagram of the invented system. Referring to Fig. 1, oil is stored in reservoir R and transferred therefrom through pipe lines 5P by pumps 1 with motors M through gate valves 3" pressure relief valve 2 fitted with oil return pipe P, pressure gauge 5, control panel 7 containing duplex cartridge filter 4, solenoid control valves 6, - k - and through flexible hoses H into oil spray header 8 containing a number, typically 4 each, of non-return type values 9 and flat Jet non-retura type nozzles 10 disposed across the width of the coil surface S moving through the oil jets J. The width of the oil Jets is controlled by selecting the number of flat Jet non-retura type nozzles in accordance, with the width of the coil surface to be oiled. The non-return type valves 9 are interlocked with the solenoid valves through flexible hoses H for controlling automatically the flow rate of oil through nozzles 10 in accordance with the speed of movement of the coils through oil Jets J to ensure uniform application of oil along the length of coils. The number of pumps with motors, gate valves, solenoid control valves and flexible hoses used is typically 2, 7, 2 and 2 respectively. Extensive field trials have been conducted on the invented system. It has been found that oil is applied on the coil surface uniformly at a thickness of 3-4 /um, and that the oil consumption is reduced to about 50% compared with the existing system. The invented system requires relatively low capital investment and is trouble-free in operation. - 5 - We Claim :- 1. An improved system for 1 oliling cold rolled compriroued stell coils sing a reservoir R for storing the oil to be applied, pipe lines P, pumps 1 with motors M, gate valves 3, a pressure relief valve 2 with an oil return pipe line JP*, an oil pressure gauge 5, a control panel 7 containing duplex cartridge filters 4 and solenoid control valves 6 and oil spray header 8 containing a number of non-return type valves 9 which are interlocked with the solenoid control valves through flexible hoses H for controlling automatically the flow rate of oil through a number of flat-Jet non-return type nozzles 10 in accordance with the speed of movement of the coils through oil jets J of the nozzles, the width of the oil jets being adjustable in accordance with the width of the surface S of the coils. 2. The system as claimed in claim 1, wherein the number of pumps with motors, gate valves, solenoid control valves and flexible hoses used are 2, 7, 2 and 2 respectively. 3. The system as claimed in claim 1 or 2, wherein the number of pairs, of non-return type valves 9 and flat-jet non return type nozzles 10 is four 4. An improved System for oiling cold rolled steel coils, substantially as herein described and illustrated in the accompanying drawings. Dated this 15th day of February 1999. (B. L. BANERJEE) of DePENNING & DePENNING Agent for the Applicants. An improved system for oiling cold rolled steel coils comprising a reservoir for storing the oil to be applied, pipe lines, pumps with motors, gate valves, a pressure relief valve with an oil return pipe line, an oil pressure gauge, a control panel containing duplex cartridge filters and solenoid control valves, and oil spray header containing a number of non-return type valves which are interlocked with the solenoid control valves through flexible hoses for controlling automatically the flow rate of oil through a number of flat-jet non-return type nozzles in accordance with the speed of movement of the coils through oil jets of the nozzles, the width of the oil jets being adjustable in accordance with the width of the surface of the coil.

Documents:

00113-cal-1999-abstract.pdf

00113-cal-1999-assignment.pdf

00113-cal-1999-claims.pdf

00113-cal-1999-correspondence.pdf

00113-cal-1999-description(complete).pdf

00113-cal-1999-drawings.pdf

00113-cal-1999-form-1.pdf

00113-cal-1999-form-2.pdf

00113-cal-1999-form-3.pdf

00113-cal-1999-form-5.pdf

00113-cal-1999-p.a.pdf

113-cal-1999-granted-abstract.pdf

113-cal-1999-granted-assignment.pdf

113-cal-1999-granted-claims.pdf

113-cal-1999-granted-correspondence.pdf

113-cal-1999-granted-description (complete).pdf

113-cal-1999-granted-drawings.pdf

113-cal-1999-granted-examination report.pdf

113-cal-1999-granted-form 1.pdf

113-cal-1999-granted-form 2.pdf

113-cal-1999-granted-form 3.pdf

113-cal-1999-granted-form 6.pdf

113-cal-1999-granted-letter patent.pdf

113-cal-1999-granted-pa.pdf

113-cal-1999-granted-reply to examination report.pdf

113-cal-1999-granted-specification.pdf