EP0172179B1 - Inducing back tension in a moving strip via a drag pad - Google Patents
Inducing back tension in a moving strip via a drag pad Download PDFInfo
- Publication number
- EP0172179B1 EP0172179B1 EP85900600A EP85900600A EP0172179B1 EP 0172179 B1 EP0172179 B1 EP 0172179B1 EP 85900600 A EP85900600 A EP 85900600A EP 85900600 A EP85900600 A EP 85900600A EP 0172179 B1 EP0172179 B1 EP 0172179B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnet
- strip
- layer
- friction material
- roll
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
- B65H23/10—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on running web
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/003—Regulation of tension or speed; Braking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/006—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only winding-up or winding-off several parallel metal bands
Definitions
- This invention relates to the treatment of steel or other magnetiseable strip as it is being wound on to a bulk coil thereof.
- the invention may be applied to the slitting of a relatively broad strip into two or more narrower strips as part of the finishing operations at a steel mill.
- the invention relates to devices for maintaining a back tension in the strip as it is wound on to the coil so as to provide a suitably rigid coil.
- Patent US--A-2,433,014 describes a device which is used to assist in braking the forward movement of steel or like strip by passing it over an electromagnet on the contact surface of which there is disposed an layer of friction material. The magnet thus provides the necessary pressure between the strip and the friction layer to induce the required frictional resistance to the movement of the strip.
- the present invention provides, according to one aspect, a method of inducing back tension in a longitudinally moving magnetiseable strip, comprising the steps of positioning a stationary electro-magnet adjacent to one side of the strip, interposing a layer of friction material between the magnet and the strip and energising the magnet to effect pressure contact between the strip and the layer, characterised in that the layer is interposed between the magnet and the strip by advancing a web of friction material extending from an uncoiler roll across the magnet to a coiler roll.
- the drag pad contacts only one side of the strip which, in practice, is the rough-finished side on which surface imperfections are of little significance.
- the invention provides, according to another aspect, a drag pad comprising an electro-magnet and a layer of friction material thereon, characterised in that the magnet provides an array of closely spaced, mutually parallel, elongate pole faces each of opposite polarity to its neighbouring face or faces and the layer of friction material covers the array, and in that the drag pad further comprises an uncoiler roll and a coiler roll for a web of friction material such that said layer may be replaced from time to time by advancing the web from one roll to the other.
- the illustrated drag pad comprises an electro- magnet 5 disposed beneath a steel strip or strips 6 issuing from pinch rolls 7 and being drawn therefrom to a wind-up coiler (not shown).
- the layer 8 (now shown in Fig. 1) of cloth friction material.
- the layer 8 directly interposed between the magnet 5 and the strip 6 is part of a long web of cloth wound initially on an uncoiler roll 9 (seen only in Fig. 1) and advanced from time to time, as the in use portion becomes worn, to a coiler roll 10.
- the magnet 5 has smoothly curved upstream and downstream nosings 11 providing substantially tangential meeting and departure between the strip 6 and the layer 8.
- the magnet 5 comprises a base plate 12, an -outer angle-iron frame secured to the base plate 12, a bed 13 of electrical steel laminations 14 stacked side by side within the outer frame and an inner frame member 15 loaded by through-bolts 16 towards the opposite outer frame member to clamp the laminations 14 into a solid bed.
- That bed may be pierced by a plurality of tubes 17 for the passage of cooling water to carry off thermal losses generated by what is necessarily a compact but powerful electro-magnet.
- the bed of laminations defines a plurality of mutually parallel slots extending transversely of the direction of travel of the strip 6.
- each slot houses a solid copper strap conductor 18 which at their respective ends are brazed together to constitute single turn, low resistance coils.
- each slot can house a plurality of turns. The coils are connected in series so that the lamination teeth to each side of the coil slots present at their ends alternate north and south pole faces 19 and 20 respectively.
- the coil sides comprising the straps 18 are wrapped in insulation 21, held in place by wedges 22 and the slot mouths and the coil end connections are all encapsulated in an insulating, hard setting, synthetic resin 23.
- the operative layer of friction material may be part of a larger sheet wrapped about the magnet 5 in the same way as such sheets are conventionally wrapped about the wooden body of a conventional drag pad.
- the friction material may be bonded to a very thin layer of steel and either wound on in the manner previously described and shown in Figure 1, or simply placed on the magnet surface as a sheet, and held in position by magnetic forces, each sheet being replaced when worn.
- the drag pad is preferred for the drag pad to be disposed in use so that the magnet pole faces extend transversely of the strip being processed, although other orientations are known to be effective.
- the length of each pole face is preferably at least equal to the width of the strip.
- the magnet For safety's sake it is preferred for the magnet to be energised from a low voltage power supply, hence the large strap conductors of the megnet coils.
- the friction material is somewhat thinner than is conventional, preferably less than 1.0 mm, thickness. Additionally it has been found that the necessary forces cannot be readily achieved without having a magnet at least 0.5 m long.
- the area of contact may be extended by comparison with that of conventional pads and a lesser pressure may be used.
- the power supply to the magnet may include means to vary the magnet's energising current thereby to adjust the contact pressure to suit the nature of the strip being processed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Electromagnets (AREA)
- Laminated Bodies (AREA)
- Winding Of Webs (AREA)
Abstract
Description
- This invention relates to the treatment of steel or other magnetiseable strip as it is being wound on to a bulk coil thereof. Typically, the invention may be applied to the slitting of a relatively broad strip into two or more narrower strips as part of the finishing operations at a steel mill.
- More particularly, the invention relates to devices for maintaining a back tension in the strip as it is wound on to the coil so as to provide a suitably rigid coil.
- Hitherto, a common expedient has been to use two drag pads each in the form of a wooden block wrapped in felt, carpet of other replaceable friction material which are pressed against opposite sides of the strip. A disadvantage of that known arrangement is that dirt particles accumulate on the pads and these sometimes cause scratch marks in the finished strip. This is especially disadvantageous because of the modern trend to provide material direct from the mill having a high quality ornamental finish, such as a coloured, bonded paint or enamel, on one side. Another known method of providing tension uses treaded bridle-rolls but this method also involves contact with both sides of the strip and can result in colour imprinting from one coil to the next. U.S. Patent US--A-2,433,014 describes a device which is used to assist in braking the forward movement of steel or like strip by passing it over an electromagnet on the contact surface of which there is disposed an layer of friction material. The magnet thus provides the necessary pressure between the strip and the friction layer to induce the required frictional resistance to the movement of the strip.
- The present invention provides, according to one aspect, a method of inducing back tension in a longitudinally moving magnetiseable strip, comprising the steps of positioning a stationary electro-magnet adjacent to one side of the strip, interposing a layer of friction material between the magnet and the strip and energising the magnet to effect pressure contact between the strip and the layer, characterised in that the layer is interposed between the magnet and the strip by advancing a web of friction material extending from an uncoiler roll across the magnet to a coiler roll. Thus, in accordance with the invention, the drag pad contacts only one side of the strip which, in practice, is the rough-finished side on which surface imperfections are of little significance.
- The invention provides, according to another aspect, a drag pad comprising an electro-magnet and a layer of friction material thereon, characterised in that the magnet provides an array of closely spaced, mutually parallel, elongate pole faces each of opposite polarity to its neighbouring face or faces and the layer of friction material covers the array, and in that the drag pad further comprises an uncoiler roll and a coiler roll for a web of friction material such that said layer may be replaced from time to time by advancing the web from one roll to the other.
- By way of example, an embodiment of the above described invention is described in more detail hereinafter with reference to the accompanying drawings.
- Figure 1 is a diagrammatic side elevation of a drag pad according to the invention, shown as in use.
- Figure 2 is a diagrammatic perspective view of the drag pad of Fig. 1 with its layer of friction material omitted.
- Figure 3 is a perspective detail view of the internal components within the enclosure marked 3 in Fig. 2, drawn to a larger scale.
- Figure 4 is a detail sectional view taken on line 4-4 of Fig. 3, drawn to a still larger scale.
- The illustrated drag pad comprises an electro-
magnet 5 disposed beneath a steel strip orstrips 6 issuing from pinch rolls 7 and being drawn therefrom to a wind-up coiler (not shown). - At least the operative part of the surface of the
magnet 5 in contact with the strip or strips is covered with a layer 8 (now shown in Fig. 1) of cloth friction material. Preferably, the layer 8 (not shown in Fig. 1) directly interposed between themagnet 5 and thestrip 6 is part of a long web of cloth wound initially on an uncoiler roll 9 (seen only in Fig. 1) and advanced from time to time, as the in use portion becomes worn, to acoiler roll 10. - For preference, the
magnet 5 has smoothly curved upstream and downstream nosings 11 providing substantially tangential meeting and departure between thestrip 6 and thelayer 8. - The
magnet 5 comprises abase plate 12, an -outer angle-iron frame secured to thebase plate 12, abed 13 ofelectrical steel laminations 14 stacked side by side within the outer frame and aninner frame member 15 loaded by through-bolts 16 towards the opposite outer frame member to clamp thelaminations 14 into a solid bed. - That bed may be pierced by a plurality of
tubes 17 for the passage of cooling water to carry off thermal losses generated by what is necessarily a compact but powerful electro-magnet. - The bed of laminations defines a plurality of mutually parallel slots extending transversely of the direction of travel of the
strip 6. Preferably each slot houses a solidcopper strap conductor 18 which at their respective ends are brazed together to constitute single turn, low resistance coils. Alternatively, each slot can house a plurality of turns. The coils are connected in series so that the lamination teeth to each side of the coil slots present at their ends alternate north and south pole faces 19 and 20 respectively. - The coil sides comprising the
straps 18 are wrapped ininsulation 21, held in place bywedges 22 and the slot mouths and the coil end connections are all encapsulated in an insulating, hard setting,synthetic resin 23. - In other less preferred embodiments the operative layer of friction material may be part of a larger sheet wrapped about the
magnet 5 in the same way as such sheets are conventionally wrapped about the wooden body of a conventional drag pad. Also, the friction material may be bonded to a very thin layer of steel and either wound on in the manner previously described and shown in Figure 1, or simply placed on the magnet surface as a sheet, and held in position by magnetic forces, each sheet being replaced when worn. - As shown in the drawings it is preferred for the drag pad to be disposed in use so that the magnet pole faces extend transversely of the strip being processed, although other orientations are known to be effective. The length of each pole face is preferably at least equal to the width of the strip.
- For safety's sake it is preferred for the magnet to be energised from a low voltage power supply, hence the large strap conductors of the megnet coils.
- Because the polarity of the magnetic pole faces preferably alternates from one to the next and as the pole faces are quite close together there is very little net magnetic field at even quite short distances from the drag pad as a whole. Indeed, to ensure that a substantial proportion of the magnetic field extends within the strip being processed, it is preferable for the friction material to be somewhat thinner than is conventional, preferably less than 1.0 mm, thickness. Additionally it has been found that the necessary forces cannot be readily achieved without having a magnet at least 0.5 m long.
- If desired, to further reduce damage to the unfinished side of the strip which contacts the drag pad, the area of contact may be extended by comparison with that of conventional pads and a lesser pressure may be used.
- Also for preference the power supply to the magnet may include means to vary the magnet's energising current thereby to adjust the contact pressure to suit the nature of the strip being processed.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85900600T ATE56163T1 (en) | 1984-02-09 | 1985-02-07 | CREATING A BRAKING STRESS ON A MOVING STRIP USING A SLEEPER PAD. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU3551/84 | 1984-02-09 | ||
AUPG355184 | 1984-02-09 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0172179A1 EP0172179A1 (en) | 1986-02-26 |
EP0172179A4 EP0172179A4 (en) | 1988-06-20 |
EP0172179B1 true EP0172179B1 (en) | 1990-09-05 |
Family
ID=3770498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85900600A Expired - Lifetime EP0172179B1 (en) | 1984-02-09 | 1985-02-07 | Inducing back tension in a moving strip via a drag pad |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0172179B1 (en) |
JP (1) | JPS61501137A (en) |
KR (1) | KR850700222A (en) |
BR (1) | BR8505163A (en) |
CA (1) | CA1272175A (en) |
DE (1) | DE3579536D1 (en) |
WO (1) | WO1985003461A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8579507B2 (en) | 2009-08-27 | 2013-11-12 | Graphic Flexible Packaging, Llc | Reinforced bag |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5644900A (en) * | 1994-02-07 | 1997-07-08 | Stone Container Corporation | Multiwall bag |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE508665C (en) * | 1930-09-29 | Fried Krupp Grusonwerk Akt Ges | Braking device for strip rolling mills | |
US2433014A (en) * | 1943-03-31 | 1947-12-23 | Carnegie Illinois Steel Corp | Apparatus for handling metallic strip |
US2717125A (en) * | 1951-07-25 | 1955-09-06 | Western Electric Co | Apparatus for advancing strands |
DE1264201B (en) * | 1960-10-04 | 1968-03-21 | Celanese Corp | Device for running an electrically non-conductive material web |
SU497069A1 (en) * | 1963-04-10 | 1975-12-30 | Method of braking rolled products on refrigerators of high-quality rolling mills | |
AU458689B2 (en) * | 1972-03-29 | 1975-03-06 | A. C. I. Operations Pty Ltd | Improvements relating to strip processing apparatus |
SU528976A1 (en) * | 1975-03-24 | 1976-09-25 | Предприятие П/Я А-7697 | Electrodynamic tensioner |
DE2836934A1 (en) * | 1978-08-24 | 1980-03-13 | Schmitz Walzmasch | TAPE RETURN DEVICE FOR METAL TAPE STRIPS TO BE REWINDED |
SU827206A1 (en) * | 1979-02-08 | 1981-05-07 | Предприятие П/Я А-7697 | Electrodynamic tensioning apparatus |
JPS58144042A (en) * | 1982-02-18 | 1983-08-27 | Toyonori Kimura | Sheet winding tensioning device |
-
1985
- 1985-02-07 JP JP60500745A patent/JPS61501137A/en active Pending
- 1985-02-07 WO PCT/AU1985/000021 patent/WO1985003461A1/en active IP Right Grant
- 1985-02-07 DE DE8585900600T patent/DE3579536D1/en not_active Expired - Lifetime
- 1985-02-07 BR BR8505163A patent/BR8505163A/en not_active IP Right Cessation
- 1985-02-07 EP EP85900600A patent/EP0172179B1/en not_active Expired - Lifetime
- 1985-02-08 CA CA000473951A patent/CA1272175A/en not_active Expired - Lifetime
- 1985-10-07 KR KR1019850700247A patent/KR850700222A/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8579507B2 (en) | 2009-08-27 | 2013-11-12 | Graphic Flexible Packaging, Llc | Reinforced bag |
Also Published As
Publication number | Publication date |
---|---|
EP0172179A4 (en) | 1988-06-20 |
WO1985003461A1 (en) | 1985-08-15 |
JPS61501137A (en) | 1986-06-12 |
BR8505163A (en) | 1986-01-21 |
EP0172179A1 (en) | 1986-02-26 |
KR850700222A (en) | 1985-12-26 |
CA1272175A (en) | 1990-07-31 |
DE3579536D1 (en) | 1990-10-11 |
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