GB2136776A - Controlling the wrapper rolls of a strip coiler - Google Patents
Controlling the wrapper rolls of a strip coiler Download PDFInfo
- Publication number
- GB2136776A GB2136776A GB08404825A GB8404825A GB2136776A GB 2136776 A GB2136776 A GB 2136776A GB 08404825 A GB08404825 A GB 08404825A GB 8404825 A GB8404825 A GB 8404825A GB 2136776 A GB2136776 A GB 2136776A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strip
- wrapper
- wrapper roll
- mandrel
- control
- 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
- B65H18/00—Winding webs
- B65H18/08—Web-winding mechanisms
- B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
-
- 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
- B21C47/02—Winding-up or coiling
- B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
- B21C47/06—Winding-up or coiling on or in reels or drums, without using a moving guide with loaded rollers, bolts, or equivalent means holding the material on the reel or drum
- B21C47/063—Winding-up or coiling on or in reels or drums, without using a moving guide with loaded rollers, bolts, or equivalent means holding the material on the reel or drum with pressure rollers only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/40—Shafts, cylinders, drums, spindles
- B65H2404/43—Rider roll construction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/40—Shafts, cylinders, drums, spindles
- B65H2404/43—Rider roll construction
- B65H2404/432—Rider roll construction involving a plurality of parallel rider rolls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Winding Of Webs (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
A coiler for coiling a strip (2) onto a mandrel (4) includes peripherally arranged wrapper rolls (5a to 5d). Each wrapper roll is radially movable by a hydraulic cylinder (9) controlled by a servo valve (12) so as to cause each wrapper roll (5) to jump to avoid a step formed by a leading edge of the strip wound around the mandrel. For at least a part of the time the control system exerts an open loop control. In the first embodiment, the wrapper roll initially bears against the wound strip with a preset pressure set by unit (19). At the first step of the wound strip, switch (23) is opened and switch (24) is closed so that unit (18) causes the wrapper roll to move radially outwardly. After a preset time, switch (24) is opened and switch (25) closed so that unit (20) causes the wrapper roll to move radially inwardly and bear against the strip being wound. Finally, switch (25) is opened and switch (23) closed so that unit (19) again controls the pressure at which the wrapper roll bears on the strip being wound. In a second embodiment, the servo valve controlling the movement of the wrapper roll is influenced by a servo current so that the valve spool moves linearly. The position sensor for the wrapper roll and the feedback circuit are eliminated in this embodiment. <IMAGE>
Description
SPECIFICATION
Method for controlling the wrapper rolls of a coiler
The present invention relates to a coiler of the type in which a strip is wound around a mandrel whilst the strip is pressed against the mandrel by means of wrapper rolls disposed around the mandrel and is concerned with a method of controlling the wrapper rolls of such a coiler when winding a strip.
A known coiler of the general type referred to above is shown in diagrammatic side elevation in
Figure 1. A strip 2 is transported over a runout table 1 by means of a pair of pinch rolls 3a and 3b and is directed towards a mandrel 4. Wrapper rolls 5a to 5d which are disposed around the mandrel 4 press the strip 2 against the mandrel 4 while the strip is being wound around the mandrel 4. A step 6, whose height is at least equal to the thickness of the strip 2, is formed between the first and second turns (or between the nth and (n+ 1 )th turns) of the strip 2 at a position corresponding to that of the free end of the strip. If the wrapper rolls 5a to 5d are always biassed against the strip 2 whilst it is being wound around the mandrel 4, a high impact is produced as each wrapper roll 5 rides over the step 6 thereby damaging the surface of the strip.Furthermore the wrapper rolls 5 tend to be thrown radially outwards by these impacts thereby momentarily releasing the force applied by the wrapper rolls on the strip. As a result, it is impossible to wind the strip 2 uniformly tightly, the surface of the strip is damaged and "necking" occurs.
In order to solve these problems, a system has been proposed in which each of the wrapper rolls is moved away from the mandrel immediately it rides over the step 6 and is then pressed against the strip again immediately after the step 6 has passed.
Such a wrapper roll control system, which is referred to as a "closed loop system", is illustrated diagrammatically in Figure 2. Each of the wrapper rolls 5a to 5d is coupled to a hydraulic cylinder 9 (only the wrapper roll 5b and its associated hydraulic cylinder 9 are shown in Figure 2) so that each wrapper roll 5 can be moved radially towards or away from the mandrel 4. The position of each wrapper roll is detected by a position sensor 31 and the force exerted on the mandrel 4 by the wrapper rolls is detected by a load cell (not shown). The operation of the hydraulic cylinder 9 is controlled by a servo valve 32 which in turn is controlled in response to a signal from a control unit 33.The control unit 33 generates an output signal which is applied to the servo valve 32 in response to an input "jump" signal X and a feedback signal Y from the position sensor 31.
Figure 3 shows the relationship between the jump signal X, the output signal (servo current) from the control unit 33 and the operation (that is to say the movement of the spool) of the servo valve 32. The movement of the spool is determined by the magnitude of the servo current (that is to say the area indicated by S in Figure 3).
In the wrapper roll control system described above, the wrapper roll is caused to jump a distance at least equal to the thickness of the strip 2 while the position of the wrapper roll is being monitored.
Figure 4 shows the position of the wrapper roll Sc with respect to the strip 2 being wound around the mandrel 4. When the wrapper roll Sc passes past the steps 6 during the time intervals T1, T3, T5..., it is moved radially outwardly away from and spaced from the strip 2 to positions L1, L2, L3 respectively, by means of the position servo control system. The distance between the outer surface of the wound strip and the position L1, L2 or L3 is such that the wrapper roll Sc is prevented from striking against the step 6.During the time intervals T2, T4...(that is to say, the time intervals between the jumping time intervals T1, T3, T5...), the wrapper roll Sc is pressed against the strip 2 under the control of a pressure exerting servo control system.
When the control of each wrapper roll is switched from the position servo control system to the pressure exerting servo control system, the wrapper roll is forced against the surface of the strip but there is a time delay before the wrapper roll is positively pressed against the surface of the strip after the wrapper roll has passed the step. Furthermore, as indicated at A in Figure 4, the wrapper roll is caused to vibrate or oscillate during the time intervals T2,
T4..., that is to say, the wrapper roll cannot be positively pressed against the surface of the strip.
It is an object of the present invention to provide a method of controlling the wrapper rolls of a coiler in a manner in which the problems of the closed loop system described above are substantially avoided.
According to the present invention there is provided a method of controlling the wrapper rolls of a coiler of the type including a mandrel about which a strip is coiled and a plurality of wrapper rolls disposed around the mandrel and adapted to press the strip against the mandrel, each wrapper roll being connected to be moved radially with respect to the mandrel by a respective hydraulic cylinder which is connected to a pressurised source of fluid and controlled by a control valve, the method including causing the wrapper rolls to jump radially outwardly to avoid the step formed by the leading edge of the strip, at least part of the control being an open loop control.Thus the method of the present invention at least partially employs an open loop system so that the delay from the time that the wrapper roll has passed the step to the time that the wrapper roll is again pressed positively against the surface of the strip is eliminated or minimised and mechanical vibration of the wrapper rolls against the surface of the strip is avoided.
In one embodiment of the invention the control of each wrapper roll includes a position control mode in which the position of the wrapper roll is detected and the wrapper roll is moved radially outwardly until its detected position corresponds to a predetermined position and is thereafter maintained in the predetermined position and a pressure control mode in which the wrapper roll is pressed against the strip on the mandrel with a pressure which is detected and maintained equal to a predetermined pressure and a transition mode between the position control mode and the pressure control mode in which the control is an open loop control in which the control valve is maintained at a predetermined setting.
In an alternative embodiment of the invention the control valve is an electrically actuated valve whose movement is a function of the applied current and the said applied current is increased cyclically for a predetermined time by an amount porportional to the thickness of the strip whereby the magnitude of each jump of each wrapper roll is substantially equal to the thickness of the strip and the wrapper rolls are caused to pass over the step by an open loop control.
Further features and details of the present invention will be apparent from the following description of certain specific embodiments which is given by way of example with reference to Figures 5 to 8 of the accompanying drawings, in which:
Figure 5 is a schematic view of a first embodiment ofthe present invention;
Figure 6 is a diagram illustrating the operation of the first embodiment shown in Figure 5;
Figure 7 is a schematic view of a second embodi mentofthe present invention; and
Figure 8 is a diagram illustrating the operation of the second embodiment shown in Figure 7.
Referring firstly to Figure 5, the wrapper roll Sc is rotatably mounted on a swing frame 7 of which one end is pivotally connected by means of a pivot pin 8 to a supporting member (not shown). The other end of the swing frame 7 is pivotally connected by a pin 11 to the free end of a piston rod 10 of a doubleacting hydraulic cylinder 9 so that the wrapper roll Sc may be moved radially away from the mandrel 4 or radially towards the mandrel 4 so as to press against the surface of the strip 2. The other wrapper rolls 5a, 5b and 5d and their mounting are substantially similar in construction to the wrapper roll Sc and will therefore not be described.A servo valve (control valve) 12 is supplied with a working oil under a constant pressure from a constant-pressure fluid source, in this case a pump 13. This pressure which is controlled by the servo valve 12, is transmitted to the hydraulic cylinder 9. The pressure in two chambers of the hydraulic cylinder 9 are detected by pressure sensors 14 and 15, respectively, and the difference in these pressures is obtained by a first arithmetic unit 16 and indicates the pressure with which the wrapper roll Sc is pressed against the mandrel 4. The pivot pin 8 is operatively connected to an angle sensor 17 so that the angular position of the swing frame 7 and thus the position of the wrapper roll Sc in the radial direction of the mandrel 4 can be detected.A first setting unit 18 sequentialiy sets the distance by which the wrapper roll Sc is to be spaced from the mandrel 4. Thus, the first setting unit 18 sets the positions L1, L2 L3... as shown in
Figures 4 and 6. A second setting unit 19 sets the pressure with which the wrapper roll Sc isto be pressed against the surface of the strip 2. Athird setting unit 20 sets the opening of the servo valve 12 when the wrapper roll Sc is forced to move from the position L1, L2, L3... toward the surface of the strip 2 (the opening of the servo valve 12 is dependent upon the thickness and the material of the strip 2).The first embodiment further includes arithmetic units 21 and 22 ans switches 23, 24 and 25 which are controlled by a timing control circuit (not shown).
Referring now to Figure 6, the mode of operation of the first embodiment is as follows: Before the time ta, only the switch 23 is closed and the servo control of the pressure applied by the wrapping roll is carried out such that the pressure determined by the first arithmetic unit 16 is maintained equal to the set value determined bythesecond setting unit 19.
The wrapper roll Sc is thus pressed against the surface of the strip 2 with a predetermined force. At the time t1 the wrapper roll Sc reaches the first step 6 and the switch 23 is opened whilst the switch 24 is closed. The first setting unit 18 now controls the servo valve and the servo control is effected such that the servo valve 12 moves the wrapper roll Sc until its position which is represented by the output signal from the angle detector 17 coincides with the set position L1 which is set by the first setting unit 18.
As a result, the wrapper roll Sc is moved to the position L1 art a certain time so as to pass past the step 6. At time t2 a time interval T1 has elapsed, that is to say after the wrapper roll Sc has passed over the step 6, the switch 24 is opened and only the switch 25 is closed. As a result, the servo valve 12 is so controlled in response to the output from the third setting unit 20 that it maintains a predetermined opening for a time interval sufficient to permit the wrapper roll Sc to be moved towards and contact with the surface of the strip (this time interval depends upon the thickness of the strip 2). The wrapper roll Sc is thus immediately moved towards and pressed against the surface of the strip 2.At time t3 after a time interval T2 has elapsed, the switch 25 is opened and the switch 23 is closed so that the servo valve 12 is controlled such that the wrapper. roll Sc is forced against the surface of the strip 2 with the force set by the second setting unit 19.
Similarly, during the time interval T4, the wrapper roll is positionally servo controlled and moved to position L2. During the time interval T5, open loop control is effected whereby the opening of the servo valve 12 is maintained constant for a predetermined time and during the time interval T6 the servo control is effected such that the wrapper roll Sc is pressed against the surface of the strip 2 with a predetermined force.
Thus in the first embodiment of the present invention, when the positional servo control mode is switched to the mode in which the wrapper roll tc is pressed against the surface of the strip 2, a predetermined opening of the servo valve 12 is maintained for a predetermined time so that the wrapper roll Sc is immediately moved towards and pressed against the surface of the strip 2. As a result, the servo control for pressing the wrapper roll Sc against the surface of the strip 2 is only started after the wrapper roll Sc has been brought into contact with the surface of the strip 2 so that vibration of the wrapper roll Sc (and the swing frame 7) can be prevented. Thus, the wrapper roll Sc can be pressed against the surface of the strip 2 in a stable manner.
As is apparent, in the first embodiment of the present invention, a predetermined opening of the servo or control valve is maintained for a predeter mined time interval when the positional servo control mode for maintaining the position of the wrapper roll in the radial direction of the mandrel at the position set by controlling the hydraulic cylinder servo or control valve is switched to the servo control mode for controlling the control valve such that the force applied to the surface of the strip by the wrapper roll becomes equal to the set force, so that the wrapper roll position servo control mode can be immediately switched to the servo control mode for pressing the wrapper roll against the surface of the strip.As a result, mechanical vibration of the wrapper roll and the like can be prevented so that the wrapper roll can be pressed against the surface of the strip in a stable manner.
Referring now to Figures 7 and 8, a second embodiment of the present invention will be described which comprises a complete open loop control without any position sensor.
As described above, the movement of the spool of a servo valve is in proportion to the magnitude of the servo current. It follows, therefore, that if the relationship between the movement of the wrapper roll and the time interval during which the current flows is obtained, the position of the wrapper roll can be controlled by controlling the magnitude of the servo current.
A control unit 33 is provided which is so designed and constructed that it delivers an output signal or servo current Z to a servo valve 32 whose magnitude is varied so that the servo valve 32 performs the desired movements. More particularly, in response to the jump signal X, servo current Z of a predetermined magnitude is supplied for a predetermined time interval to the servo valve 32.
Referring particularly to Figure 8, in response to the jump signal applied to the control unit 33, the servo current Z is rectangularly generated for a time
interval T, i.e. the current Z is of square wave form.
The time interval T is equal to the time interval T shown in Figure 3 during which the spool is moved.
Furthermore, the area S' under the graph of the
servo current Z is equal to the area S in Figure 3.
Thus in the second embodiment, in response to the servo current applied to the servo valve 32, the valve spool moves linearly. since S' is equal to S, the
movement x' of the spool is also equal to x shown in
Figure 3. Thus the operation of the apparatus of
Figure 7 is substantially similar to that of the
conventional apparatus described above.
Thus in the second embodiment, not only the
position sensor but also the feedback circuit are
completely eliminated so that in addition to the
effects, features and advantages of the first embodi
ment, the operational reliability is enhanced and the
circuit is simplified. As a result, the manufacturing
cost is decreased.
In both embodiments the signals which initiate
movement of the control valve may be timed by any
convenient means, in dependence on the speed of
winding of the strip and the number of turns on the
mandrel.
Claims (4)
1. A method of controlling the wrapper rolls of a coilerofthetype including a mandrel about which a strip is coiled and a plurality of wrapper rolls disposed around the mandrel and adapted to press the strip against the mandrel, each wrapper roll being connected to be moved radially with respect to the mandrel by a respective hydraulic cylinder which is connected to a pressurised source of fluid and controlled by a control valve, the method including causing the wrapper rolls to jump radially outwardly to avoid the step formed by the leading edge of the strip, at least part of the control being an open loop control.
2. A method as claimed in Claim 1 in which the control of each wrapper roll includes a position control mode in which the position of the wrapper roll is detected and the wrapper roll is moved radially outwardly until its detected position corresponds to a predetermined position and is thereafter maintained-in the predetermined position and a pressure control mode in which the wrapper roll is pressed against the strip on the mandrel with a pressure which is detected and maintained equal to a predetermined pressure and a transition mode between the position control mode and the pressure control mode in which the control is an open loop control in which the control valve is maintained at a predetermined setting.
3. A method as claimed in Claim 1 in which the control valve is an electrically actuated valve whose movement is a function of the applied current and the said applied current is increased cyclically for a predetermined time by an amount proportional to the thickness of the strip whereby the magnitude of each jump of each wrapper roll is substantially equal to the thickness of the strip and the wrapper rolls are caused to pass over the step by an open loop control.
4. A method of controlling the wrapper rolls of a coiler substantially as specifically herein described with reference to Figure 5 and 6 or Figures 7 and 8 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3122483A JPS59156514A (en) | 1983-02-26 | 1983-02-26 | Controlling method of wrapper roll in coiler |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8404825D0 GB8404825D0 (en) | 1984-03-28 |
| GB2136776A true GB2136776A (en) | 1984-09-26 |
| GB2136776B GB2136776B (en) | 1986-01-22 |
Family
ID=12325450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08404825A Expired GB2136776B (en) | 1983-02-26 | 1984-02-24 | Controlling the wrapper rolls of a strip coiler |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS59156514A (en) |
| DE (1) | DE3406661C2 (en) |
| FR (1) | FR2541657B1 (en) |
| GB (1) | GB2136776B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5743483A (en) * | 1997-03-27 | 1998-04-28 | Illinois Tool Works Inc. | Anti-vibration system for high speed winding of sheet material and method therefor |
| CN104874639A (en) * | 2014-02-27 | 2015-09-02 | 宝山钢铁股份有限公司 | Dynamic control method of coiler auxiliary coiling roller seam |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3539900A1 (en) * | 1985-11-11 | 1987-05-14 | Schloemann Siemag Ag | DEVICE FOR CONTROLLING THE LIFTING AND PRESSURE MOVEMENTS OF THE TAPE PRESSURE REELS OF ROLLING TAPE REELS |
| JP4736752B2 (en) * | 2005-11-29 | 2011-07-27 | 住友金属工業株式会社 | Step-avoidance control device for hot-rolled down coiler and control method therefor |
| CN102357557B (en) * | 2011-07-26 | 2013-09-18 | 联众（广州）不锈钢有限公司 | Steel strip cold rolling and winding method without additional lining paper |
| CN103084430B (en) * | 2011-10-28 | 2015-10-28 | 宝山钢铁股份有限公司 | A kind of band steel that reduces produces method and the device that waist rolls over defect |
| CN102874630A (en) * | 2012-10-23 | 2013-01-16 | 昆山特力伯传动科技有限公司 | Conveying belt winding device |
| CN109573134B (en) * | 2019-01-15 | 2021-07-30 | 衢州市智能制造技术与装备研究院 | PVC door skin is baling equipment for factory |
| CN110342303A (en) * | 2019-06-22 | 2019-10-18 | 江苏鹏翔新材料科技股份有限公司 | A kind of cloth winding storing mechanism |
| CN115318890A (en) * | 2022-06-28 | 2022-11-11 | 江苏普力重工科技有限公司 | Intelligent plate rolling machine tool field bus control mechanism and control system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2092111A (en) * | 1981-01-29 | 1982-08-11 | Ishikawajima Harima Heavy Ind | Apparatus for winding metal strip |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584222A (en) * | 1978-12-20 | 1980-06-25 | Ishikawajima Harima Heavy Ind Co Ltd | Control method of wrapper roll |
| JPS5586622A (en) * | 1978-12-25 | 1980-06-30 | Ishikawajima Harima Heavy Ind Co Ltd | Controlling method for wrapper roll |
| FR2498577A1 (en) * | 1981-01-23 | 1982-07-30 | Ishikawajima Harima Heavy Ind | Strip winding machine, using winding mandrel - has winding rolls with sensors, responsive to roll shift and generating corresponding signal |
| JPS5992118A (en) * | 1982-11-15 | 1984-05-28 | Mitsubishi Heavy Ind Ltd | Controlling device of evading tip of strip in take-up device |
-
1983
- 1983-02-26 JP JP3122483A patent/JPS59156514A/en active Granted
-
1984
- 1984-02-24 GB GB08404825A patent/GB2136776B/en not_active Expired
- 1984-02-24 DE DE19843406661 patent/DE3406661C2/en not_active Expired
- 1984-02-27 FR FR8403093A patent/FR2541657B1/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2092111A (en) * | 1981-01-29 | 1982-08-11 | Ishikawajima Harima Heavy Ind | Apparatus for winding metal strip |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5743483A (en) * | 1997-03-27 | 1998-04-28 | Illinois Tool Works Inc. | Anti-vibration system for high speed winding of sheet material and method therefor |
| CN104874639A (en) * | 2014-02-27 | 2015-09-02 | 宝山钢铁股份有限公司 | Dynamic control method of coiler auxiliary coiling roller seam |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3406661A1 (en) | 1984-09-06 |
| GB8404825D0 (en) | 1984-03-28 |
| FR2541657B1 (en) | 1987-06-19 |
| GB2136776B (en) | 1986-01-22 |
| JPH0128649B2 (en) | 1989-06-05 |
| DE3406661C2 (en) | 1986-12-18 |
| JPS59156514A (en) | 1984-09-05 |
| FR2541657A1 (en) | 1984-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930224 |