EP1996340A2 - Machine for the continuous application of protection products on a metallic strip - Google Patents
Machine for the continuous application of protection products on a metallic stripInfo
- Publication number
- EP1996340A2 EP1996340A2 EP07713092A EP07713092A EP1996340A2 EP 1996340 A2 EP1996340 A2 EP 1996340A2 EP 07713092 A EP07713092 A EP 07713092A EP 07713092 A EP07713092 A EP 07713092A EP 1996340 A2 EP1996340 A2 EP 1996340A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- machine
- application
- rolls
- skids
- machine according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
Definitions
- the present invention relates to machines for the continuous application of protection products on a metallic strip, also called "chem coater”.
- Chem coaters are special machines for the continuous deposition of varnishes and/or other finishing products, almost exclusively used in metallic strip process lines in the steel industry.
- the concept at the basis of this type of machine is relatively simple: two opposite metallic rolls, with or without a rubber coating, transfer and homogeneously spread the coating material onto one or both of the surfaces of the continuous advancing metallic strip.
- the two rolls are called calibrating and application rolls in relation to their function.
- the machine operator can be assisted by automatic systems, such as for example a synchronism bar which consists in an automatic system which symmetrically moves the two sections together with respect to a theoretical centre.
- the subsequent phase consists in the fine positioning and optimization of the load for depositing the coating.
- the further convergence, centering, force exerted and final calibration on the strip are run by a second advance system (fine regulation) , with independent moving systems (skids and actuators) situated above the first system.
- Electronic centering aids are also available for this second movement system but, as a result of the critical nature of the operation, these are often deactivated and the operation is completely manual to allow the maximum maneuvering freedom.
- the machine is normally capable of exploiting its automatisms for maintaining the conditions established or managing the production transitories, such as opening and closing operations in correspondence with welding cords.
- the lack of an adequate sensor system however does not allow them to adapt to new conditions that may arise during the processing. This excessive rigidity of the system therefore obviously requires a careful and alert control on the part of the operator which is not compatible with the declared simplicity of the machine.
- a control method for governing the load of the rolls of a machine for applying a coating to a metallic strip is described for example in the document EP 0681510.
- a retroaction method is defined for governing the load of the rolls, using however the thickness data of the coating deposited which is obviously localized (in this particular case on the lower surface of the strip) , presuming a distribution model with a homogeneity which is rarely verified in operating situations.
- the main problem of the chem coaters currently available on the market, whether they be manual or automatic, consists in the doubling of the movement systems of the rolls, i.e. the superimposed double-skid configuration for the movement of the calibration and application rolls situated on each side of the metallic strip to be coated.
- a further problem ' encountered in current machines consists in the limited autonomy, referring to the incapacity of reacting autonomously to changing operative conditions, . that this generation- of machine shows when considerable transversal unbalancings are present in the geometry of the strip.
- the lack, in fact, of an exhaustive detection system of the operating conditions inhibits the electronics installed from completely governing the process, leaving the actions to be taken to the experience of the line operator.
- the strip can reach the machine with a perceptively angled side, for example one of its ends wound around the advance axis.
- This condition causes a non-linear load gradient in the transversal direction of the strip with consequent non- homogeneity in the thickness of the coating deposited.
- the control software adapts inadequately to this condition and, in addition, the configuration based on the double movement system of the rolls (double skid) reduces the rigidity of the mechanical system, increasing this non- homogeneity of the deposit.
- the control operations and consequent actions are therefore left to the machine operator who acts manually with different set-ups at the ends of the application cylinder, creating an unbalancing of the basic set-ups.
- An objective of the present invention is therefore to provide a "chem coater" machine for the continuous application of protection products on a metallic strip in which the movement mechanism of the calibration and application rolls are considerably simplified, with a consequent reduction in the construction costs of the machine itself.
- Another objective of the present invention is to lighten the roll-holder section of the machine, reducing the power requirements installed in the actuators and at the same time increase the response rate -to any operating variation with respect to the initial regulation parameters .
- a further objective of the present invention is to increase the overall rigidity of the machine, reducing the susceptibility of the system to deposit defects due to geometrical imperfections of the metallic strip to be coated.
- Yet another objective of the present invention is to reduce the number of parts subject to maintenance of the machine, increasing' its intrinsic qualities of maintainability, observability and reliability.
- a further objective of the present invention is to reduce the development, construction and maintenance costs using a single project, the same, for the two side roll-holder sections of the machine. These sections are then installed, with assembly rotated by 180°, at different heights operating directly on the metallic base, much -less costly with respect to the machine itself.
- figure 1 is a side schematic view of a machine for the continuous application of protection products on a metallic strip according to the known art
- figure IA is a transversal sectional view along the line A of figure 1
- figure 2 is a side schematic view of a machine for the continuous application of protection products on a metallic strip- according to the present invention
- figure 2A is a transversal sectional view obtained along the line B of figure 2.
- each semi-section essentially comprises an application roll 100, capable of transferring the coating material, removed from a containment tank (not shown) , onto an advancing metallic strip, and a calibration roll 102, with an axis parallel to that of the corresponding application roll 100.
- Each calibration roll 102 is assembled on a first movement device consisting of two sliding blocks or skids 104, one for each side of the roll 102, sliding axially along respective linear guides 106 in a perpendicular direction with respect to the axis of the rolls 100 and 102, said linear guides 106 being formed on a second movement device, in turn consisting of a pair of sliding blocks or skids 108, on which the application roll 100 is assembled.
- the skids 108 whose function is to regulate the distance of the application roll 100 from the surface of the continuous strip, slide axially along linear guides 110 envisaged on a third movement device of the semi-section of the machine, consisting of a pair of roll-holder shoulders 112 in turn sliding along guides 114, also visible in the section of figure IA, integral with the base 116 of the application machine.
- the pairs of skids 104 and 108 of each semi- section are respectively driven by mechanical and/or electrical actuators 118 and 120, activated separately to effect both the reciprocal positioning movements of the two rolls 100 and 102 and the movement of the roll 100 with respect to the continuous strip.
- the roll-holder shoulders 112 can also be moved by corresponding actuators to position each entire group consisting of skids and rolls of the same semi-section with respect to the strip to be coated. It is therefore evident that a complex movement system such as that described above is difficult to regulate, whether it be subjected to automatic or manual controls.
- each semi-section for example S 1 , comprises at least one application roll 200, capable of transferring the coating material onto the advancing metallic strip, and at least one calibration roll 202, with an axis parallel to that of the corresponding application roll 200 and in contact therewith under operating conditions.
- the coating material can be removed from a containment tank (not shown) in which the calibration roll 202 is partially immersed, which, in relation to the contact pressure with the application roll 200 and relative rotation rates, determines the quantity of material to be transferred onto the metallic strip.
- This type of application implies a rotation of the application rolls 200 contrary to the advance direction of the metallic strip and is commonly called “application in reverse”.
- the other possible application called “forward”, with a rotation of the application rolls 200 in the advance direction of the metallic strip, is achieved by feeding the coating material from above directly between the calibration roll 202 and the application roll 200.
- the quantity of material to be transferred onto the metallic strip is determined by the pressure between the two rolls 200 and 202 and their rotation rate.
- Each application roll 200 of each semi-section is hinged, in correspondence with its ends, onto a pair of moveable skids 204, one for each side of the machine, sliding along linear guides 206 preferably horizontal assembled directly on the metallic base 20.8 of the machine itself. More specifically, as can be clearly seen in figure 2, the two identical semi-sections Si and S2 are installed, by assembling them rotated by 180° with respect to each other, at different heights on the base 208 of the machine, operating directly thereon without the use of additional moveable elements which make the whole movement system more complex and less rigid.
- Each skid 204 is moved by at least one electric servomotor 210 driven by means of an inverter, in order to ensure the automatic and perfectly controlled moving operations of the rolls.
- the skids 204 unify both the main movement of the group consisting of the rolls 200 and 202, i.e. from the rest or maintenance position to the operating position and vice versa, and also that relating to the operating position, which consists in guaranteeing an adequate penetration of the application rolls 200 with respect to the continuous strip, said operations however only being possible, in machines of the known type, with the double movement of the skids 108 and 112.
- each semi-section Si and S 2 can be moved by the respective servomotors 210 either individually, when defects of the strip must be compensated during processing operations, and also contemporaneously, to guarantee a parallel movement of the application rolls 200 with respect to the strip itself.
- Each calibration roll 202 is assembled in a conventional way, on a pair of skids 212 which slide axially, in a substantially perpendicular direction with respect to the axis of the rolls 200 and 202, along respective linear guides 214 situated on the skids 204, so that only the movement relating to the calibration rolls 202 with respect to the application rolls 200 is left to said skids 212.
- each of the guides (206) of the machine according to the invention advantageously consists of a double guiding rail (20 ⁇ a, 206b) for each roll-holder skid 204 of each semi- section Si and S 2 .
- This expedient ensures a much higher structural rigidity with respect to machines of the known type, both on the advance surface of the strip and that orthogonal thereto, reducing susceptibility to depositing defects of the coating material and therefore guaranteeing a more uniform deposition of the product to be applied to the strip.
- the chem coater in an embodiment example in which the chem coater is entirely automated, it can be equipped with position sensors, for controlling the opening and closing of the semi-sections Si and S 2 at the head of the strip, pressure sensors, capable of monitoring the stress exerted on the rolls 200 and 202 in the preferred directions (axial of the motor and in the direction of the strip) , and accelerometers, to control the level of dynamic stress to which the whole structure of the machine is subjected.
- the above pressure sensors preferably consist of load cells, one for each skid 204, to automatically regulate the application machine, again by means of servomotors 210, in order to obtain a certain load (pressure) on the application roll 200.
- the constant control of the signals provided at the outlet of the load cells is used to manage the operating position of the application rolls 200 with respect to the strip, with the double purpose of finely regulating the quantity of material deposited and, by changing the winding angle of the strip on the rolls 200, optimizing the mechanical stress absorbed by the application machine.
- Monitoring systems are also envisaged in the manual version of the application machine, which allow a remote control of the machine with a consequent reduction in operators assigned to the production line and increased safety, as the physical presence of a person close to the passage area of the strip is no longer necessary.
- Another important characteristic of the application machine according to the present invention consists in the control of the accelerations and translation rates of the roll-holder skids 204. This prevents brusque variations in the velocity from causing leakages from the containment tanks and consequent dispersions into the environment of chemical products adopted for the coating of the strip.
- automatisms envisaged on the machine according to the invention allow the position of the rolls 200 to be controlled, which, together with the velocity control, optimizes the opening and closing times of the rolls on the strip in the passage phase of the welding between two adjacent strips, considerably reducing the length of the non-treated strip and therefore the quantity of waste strip.
- the machine for the continuous application of protection products on a metallic strip achieves the objectives specified above, in particular the simplification of the movement mechanism of the rolls, thus improving the possibility of regulating the machine, also thanks to the use of the sophisticated control electronics, and its structural rigidity.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000534A ITMI20060534A1 (en) | 2006-03-23 | 2006-03-23 | SIMPLIFIED MACHINE FOR CONTINUOUS APPLICATION OF PROTECTIVE PRODUCTS ON A METAL TAPE |
PCT/IB2007/000496 WO2007107819A2 (en) | 2006-03-23 | 2007-03-20 | Machine for the continuous application of protection products on a metallic strip |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1996340A2 true EP1996340A2 (en) | 2008-12-03 |
EP1996340B1 EP1996340B1 (en) | 2011-06-15 |
Family
ID=38522795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07713092A Active EP1996340B1 (en) | 2006-03-23 | 2007-03-20 | Machine for the continuous application of protection products on a metallic strip |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1996340B1 (en) |
AT (1) | ATE512726T1 (en) |
ES (1) | ES2368123T3 (en) |
IT (1) | ITMI20060534A1 (en) |
WO (1) | WO2007107819A2 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0024029B1 (en) * | 1979-08-10 | 1982-10-27 | Hoesch Aktiengesellschaft | Apparatus for coating striplike material, particularly strip metal |
US5743964A (en) * | 1995-01-24 | 1998-04-28 | Fata Hunter, Inc. | Roll coating system |
AT500487B1 (en) * | 2004-07-01 | 2006-01-15 | Voest Alpine Ind Anlagen | BAND COATING EQUIPMENT |
-
2006
- 2006-03-23 IT IT000534A patent/ITMI20060534A1/en unknown
-
2007
- 2007-03-20 EP EP07713092A patent/EP1996340B1/en active Active
- 2007-03-20 ES ES07713092T patent/ES2368123T3/en active Active
- 2007-03-20 AT AT07713092T patent/ATE512726T1/en active
- 2007-03-20 WO PCT/IB2007/000496 patent/WO2007107819A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007107819A3 * |
Also Published As
Publication number | Publication date |
---|---|
ATE512726T1 (en) | 2011-07-15 |
ES2368123T3 (en) | 2011-11-14 |
WO2007107819A3 (en) | 2008-12-04 |
ITMI20060534A1 (en) | 2007-09-24 |
EP1996340B1 (en) | 2011-06-15 |
WO2007107819A2 (en) | 2007-09-27 |
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