EP0172179A1 - Inducing back tension in a moving strip via a drag pad. - Google Patents
Inducing back tension in a moving strip via a drag pad.Info
- Publication number
- EP0172179A1 EP0172179A1 EP85900600A EP85900600A EP0172179A1 EP 0172179 A1 EP0172179 A1 EP 0172179A1 EP 85900600 A EP85900600 A EP 85900600A EP 85900600 A EP85900600 A EP 85900600A EP 0172179 A1 EP0172179 A1 EP 0172179A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnet
- strip
- layer
- friction material
- drag pad
- 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
- 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 magneti ⁇ eable 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.
- 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.
- the present invention was devised to overcome the above-indicated disability and does so by utilising a single pad embodying an electro-magnet to attract the strip against the pad and in that way provide the necessary pressure between the strip and pad to induce the required frictional resistance to the movement of the strip.
- 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 consists in a method of inducing back tension in a longitudinally moving magnetiseable strip comprising the steps of positioning a stationary electro-magnet adjacent 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.
- the invention also consists in a drag pad comprising an electro-magnet providing an array of closely spaced, mutually parallel, elongate pole faces each of opposite polarity to its neighbouring pole face or faces and a layer of friction material covering said array.
- 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
- Figure 4 is a detail sectional view taken on line 4-4 of Fig. 3 drawn to a still larger scale. DESCRIPTION OF EMBODIMENTS
- 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).
- a layer 8 (shown in Fig. 1) of cloth friction material.
- the layer 8 (shown in Fig. 1) 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 coils 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 magnet coils. Becaus.e 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.
- 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)
- Winding Of Webs (AREA)
- Laminated Bodies (AREA)
- Electromagnets (AREA)
Abstract
Procédé pour induire une contre-tension dans une bande magnétisable (6) se déplaçant longitudinalement, comportant les étapes suivantes: positionnement d'un électro-aimant stationnaire (5) près d'un côté de la bande (6), interposition d'une couche de tissu ou d'un autre matériau de friction (8) entre l'aimant (5) et la bande (6) et excitation de l'aimant (5) pour effectuer une traction sur la bande (6) en raison du contact de pression entre la bande (6) et la couche (8). Est également décrit un patin de traction comportant un électro-aimant (5) offrant un réseau de faces polaires (19, 20) allongées, parallèles entre elles, faiblement espacées, chacune d'une polarité opposée à sa ou ses faces voisines, ainsi qu'une couche de matériau de friction (8) recouvrant le réseau.Method for inducing a counter tension in a longitudinally moving magnetizable strip (6), comprising the following steps: positioning of a stationary electromagnet (5) near one side of the strip (6), interposition of a layer of fabric or other friction material (8) between the magnet (5) and the strip (6) and excitation of the magnet (5) to pull the strip (6) due to contact pressure between the strip (6) and the layer (8). Also described is a traction shoe comprising an electromagnet (5) offering a network of polar faces (19, 20) elongated, parallel to each other, spaced apart, each of a polarity opposite to its neighboring face (s), as well as 'a layer of friction material (8) covering the network.
Description
Claims
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 |
---|---|---|---|
AUPG355184 | 1984-02-09 | ||
AU3551/84 | 1984-02-09 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0172179A1 true EP0172179A1 (en) | 1986-02-26 |
EP0172179A4 EP0172179A4 (en) | 1988-06-20 |
EP0172179B1 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 |
---|---|---|---|---|
US5644900A (en) * | 1994-02-07 | 1997-07-08 | Stone Container Corporation | Multiwall bag |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2771574A1 (en) | 2009-08-27 | 2011-03-17 | Graphic Packaging International, Inc. | Reinforced bag |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2433014A (en) * | 1943-03-31 | 1947-12-23 | Carnegie Illinois Steel Corp | Apparatus for handling metallic strip |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE508665C (en) * | 1930-09-29 | Fried Krupp Grusonwerk Akt Ges | Braking device for strip rolling mills | |
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 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 EP EP85900600A patent/EP0172179B1/en not_active Expired - Lifetime
- 1985-02-07 JP JP60500745A patent/JPS61501137A/en active Pending
- 1985-02-07 BR BR8505163A patent/BR8505163A/en not_active IP Right Cessation
- 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
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2433014A (en) * | 1943-03-31 | 1947-12-23 | Carnegie Illinois Steel Corp | Apparatus for handling metallic strip |
Non-Patent Citations (1)
Title |
---|
See also references of WO8503461A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5644900A (en) * | 1994-02-07 | 1997-07-08 | Stone Container Corporation | Multiwall bag |
Also Published As
Publication number | Publication date |
---|---|
KR850700222A (en) | 1985-12-26 |
CA1272175A (en) | 1990-07-31 |
EP0172179A4 (en) | 1988-06-20 |
DE3579536D1 (en) | 1990-10-11 |
WO1985003461A1 (en) | 1985-08-15 |
JPS61501137A (en) | 1986-06-12 |
BR8505163A (en) | 1986-01-21 |
EP0172179B1 (en) | 1990-09-05 |
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