CN110871215B - Method for preventing thin strip steel from deviating in uncoiling and strip threading process of cold-rolled galvanized wire - Google Patents
Method for preventing thin strip steel from deviating in uncoiling and strip threading process of cold-rolled galvanized wire Download PDFInfo
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- CN110871215B CN110871215B CN201910963560.XA CN201910963560A CN110871215B CN 110871215 B CN110871215 B CN 110871215B CN 201910963560 A CN201910963560 A CN 201910963560A CN 110871215 B CN110871215 B CN 110871215B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0064—Uncoiling the rolled product
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Abstract
The invention relates to a method for preventing deviation of thin strip steel in an uncoiling and threading process of a cold-rolled galvanized wire, belonging to the technical field of hot galvanizing production processes. The technical scheme is as follows: the tension of the strip steel between the pinch roll and the uncoiler is changed through the reverse rotation of the uncoiler, so that the tension of the strip steel is larger than the suction force of the magnetic belt, the strip steel in a wave shape is not adsorbed on the magnetic belt, and the strip steel is driven to continue to move on a central line to penetrate through the strip steel only under the friction force and the pressure of the pinch roll. The invention changes the tension of the strip steel between the pinch roll and the uncoiler by utilizing the reverse rotation of the uncoiler to prevent the deviation of the thin strip steel in the uncoiling process, thereby ensuring the alignment of the strip steel in the uncoiling process and ensuring the continuous and stable operation of a unit. The invention only needs less investment and simple uncoiling procedure change, and has the advantage of easy operation.
Description
Technical Field
The invention relates to a method for preventing deviation of thin strip steel in an uncoiling and threading process of a cold-rolled galvanized wire, belonging to the technical field of hot galvanizing production processes.
Background
The hot galvanized plate has the characteristics of strong corrosion resistance, easy deep processing, long service life, low cost, attractive surface and the like, is widely applied and is mainly applied to manufacturing industries of internal components, panels and the like of household appliances and automobile manufacturing industries. The hot galvanizing unit is a continuous production line, and a certain amount of waste products and degraded products can be generated when the unit stops once, so that the quality of the product is reduced, a large amount of production cost is wasted, and unnecessary loss is increased for enterprises. In the actual production, the phenomenon of deviation of the uncoiling, threading and threading of the thin strip steel at the inlet section often occurs, and particularly, the phenomenon of deviation is serious when the thin-specification (less than 0.7 mm) strip steel is produced. The main reason for the deviation is that the defects of single edge wave, camber, double edge wave and the like exist in the thin strip steel, the thin strip steel is adsorbed on the magnetic belt (5) in the lifting state due to the action of the attraction force of the magnetic belt and the small self weight of the strip steel in the strip penetrating process of the thin strip steel, so that the stress of the thin strip steel in the strip penetrating process is different, the deviation of the thin strip steel is caused, the problems of the edge curling, the tearing and the like of the strip steel are caused, even the stop can be caused in serious cases, and the deviation problem of the thin strip steel must be controlled in order to ensure the stable operation of a unit.
The uncoiling and threading process is mainly divided into two processes, namely an uncoiling process and a threading process. Firstly, sleeving a steel coil on a mandrel of an uncoiling machine in the uncoiling process, and then tensioning the mandrel to enable the outer surface of the mandrel to be tightly contacted with the inner ring of the steel coil without relative movement; then the magnetic belt is pressed down by taking the winding drum (1') as a hinge point from a non-working position to a working position, and when the belt contacts the steel strip on the outermost circle of the steel coil, the pressing stop position is as the position of a dotted line in the figure 2; then the dabber drives the coil of strip and rotates according to anticlockwise (the coil of strip rotates the opposite direction of arrow point in figure 2) together, and magnetic force belt rotates clockwise (the opposite direction of arrow point is rotated to the coil of strip in figure 2) with the speed of being in step with the dabber simultaneously, and dabber and magnetic force belt stall when the tape head adsorbs on magnetic force belt, and whole process of opening a book is accomplished.
The process of threading is that the mandrel and the steel coil rotate together clockwise (the direction of the rotating arrow of the steel coil in figure 2), and the magnetic belt is positioned at the working position (the position of the dotted line in figure 2) and drives the strip steel to move along the direction of 9 at the synchronous speed with the mandrel; the pinch rolls are in an open position to receive the strip head prior to the strip head entering the pinch rolls. When the strip head detects that the strip steel passes through the pinch roll through a grating (7) arranged behind the pinch roll, the pinch roll is closed, and the magnetic belt is changed from the working position to the non-working position (the position of a solid line in figure 2). The closed pinch roll forwards conveys the head of the strip steel in the strip threading process to provide forward power for the strip steel. The mandrel and the pinch roll drive the strip steel to move forwards along the direction 9 at a synchronous speed.
Aiming at the condition of the uncoiling and threading process of strip steel, the existing uncoiling and threading procedure is not easy to cause the deviation of the strip steel when the strip steel with thick specification and good plate shape is produced, and if the strip steel with thin specification and poor plate shape is encountered, the existing uncoiling and threading procedure is easy to cause the deviation of the strip steel, thereby influencing the stable operation of a production line. Therefore, how to find a proper method for preventing the deviation of the strip steel in the uncoiling and threading process becomes a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a method for preventing thin strip steel from deviating in the uncoiling and strip threading process of a cold-rolled galvanized wire, which effectively prevents the deviation problem of the thin strip in the strip threading process, so as to ensure the stable operation of a production line and solve the problems in the background technology.
The technical scheme of the invention is as follows:
a method for preventing thin strip steel from deviating in the process of uncoiling and threading of a cold-rolled galvanized wire changes the tension of strip steel between a pinch roll and an uncoiler through the reverse rotation of the uncoiler, so that the tension of the strip steel is greater than the suction force of a magnetic belt, the strip steel with wave shapes is not adsorbed on the magnetic belt any more, and the strip steel is driven to continue moving on a central line to thread the strip steel only by the friction force and the pressure of the pinch roll.
The method comprises the following specific steps:
firstly, coil penetration: sleeving a steel coil on a mandrel of an uncoiler (the steel coil is required to be placed on a central line of a unit during coiling), after the mandrel expands tightly, the surface of the inner ring of the steel coil is in close contact with the outer surface of the expanded mandrel, relative motion cannot be generated between the steel coil and the mandrel, and the strip head is positioned at the arc part at the left lower part of the outermost ring of the steel coil when viewed from the side;
unwinding: after the mandrel is expanded, the surface of the inner ring of the steel coil is in close contact with the outer surface of the expanded mandrel, the magnetic belt is pressed down by taking the winding drum as a hinge point, moves along an arc motion track in an anticlockwise direction, and stops pressing down when the belt contacts the steel strip on the outermost ring of the steel coil; then the mandrel drives the steel coil to rotate together in the anticlockwise direction, meanwhile, the magnetic belt rotates at the speed synchronous with the mandrel, when the tape head is adsorbed on the magnetic belt, the mandrel and the magnetic belt stop rotating, and at the moment, the tape head is positioned on the arc part at the upper right of the outer ring of the steel coil when viewed from the side;
thirdly, threading the belt: when threading, the mandrel and the steel coil rotate clockwise, and the magnetic belt is in a working position and the mandrel drives the strip steel to move along the forward direction at a synchronous speed; the pinch rolls are in an open position to receive the strip head prior to the strip head entering the pinch rolls. When the strip head detects that strip steel passes through the pinch roll through a grating arranged behind the pinch roll, the pinch roll is closed;
fourthly, pausing the uncoiling procedure: when the grating detects a strip head, the uncoiling procedure is suspended, and the mandrel, the magnetic belt and the pinch roll stop rotating;
lifting the magnetic belt to a non-working position: the magnetic belt moves in an arc motion track in a clockwise direction by taking a winding drum (particularly, the winding drum which is closer to the pinch roll in the figure 2) as a hinge point from a working position to a non-working position, and stops moving when the magnetic belt moves to a position;
sixthly, reversing the uncoiler: when the magnetic belt moves to a non-working position, the magnetic belt stops rotating, the mandrel drives the steel coil to rotate anticlockwise for 0.1-0.3 m, meanwhile, the pinch roll drives the strip steel to only receive the friction force and the pressure of the pinch roll, the strip steel rotates at the speed synchronous with the mandrel and stops rotating with the mandrel at the same time, the strip steel normally starts to penetrate after being not adsorbed on the magnetic belt after the reversal is completed, and at the moment, the strip steel only receives the friction force and the pressure of the pinch roll and the tension between the pinch roll and the steel coil and is not subjected to transverse disturbance power any more;
and seventhly, continuously threading the belt: the magnetic belt is in a non-working position, the pinch roll is in a closed state, the mandrel is in an expansion state, and then the pinch roll and the mandrel rotate at a synchronous speed to drive the strip steel to move forwards.
The method for preventing the thin strip steel from deviating in the uncoiling and threading process comprises the step of determining that the uncoiler reversely rotates by 0.1-0.3 m according to a large amount of field experimental data, and the strip steel is not adsorbed on the magnetic strip because the reverse rotation of the strip steel is smaller than 0.2 m due to small general wave shapes.
In the threading process, the strip steel is not tensioned before the strip head reaches the pinch roll, and the strip steel is driven to thread through the suction force and the friction force of the magnetic belt; when the strip steel passes through the pinch roll, the strip steel between the uncoiler and the pinch roll has tension, but the strip steel is subjected to tension smaller than the suction force of the magnetic belt due to the defects of poor strip shape (single-side waves, double-side waves and camber) and the like of the thin strip steel and the small self weight of the strip steel, and the raised part of the wave-shaped strip steel of the magnetic belt is also adsorbed on the magnetic belt to cause the strip steel to deviate.
According to the invention, the tension of the strip steel between the pinch roll and the uncoiler is changed by reversing the uncoiler in the fifth step, so that the tension of the strip steel is greater than the suction force of the magnetic belt, thereby changing the transverse disturbance force, and the strip steel is driven to be on the central line only by the friction force and the pressure of the pinch roll, so that the problem of deviation of the thin strip steel in the uncoiling process is effectively prevented, and the stable operation of a production line is ensured.
The invention has the beneficial effects that: the invention changes the tension of the strip steel between the pinch roll and the uncoiler by utilizing the reverse rotation of the uncoiler to prevent the deviation of the thin strip steel in the uncoiling process, thereby ensuring the alignment of the strip steel in the uncoiling process and ensuring the continuous and stable operation of a unit. The invention only needs less investment and simple uncoiling procedure change, and has the advantage of easy operation.
Drawings
FIG. 1 is a top view of the magnetic belt of the present invention;
FIG. 2 is a side view of the magnetic belt of the present invention;
FIG. 3 is a schematic diagram of a simple structure for threading a ribbon from an uncoiler of the present invention;
FIG. 4 is a top view of the magnetic belt of the present invention with the strip steel adsorbed in a raised condition;
FIG. 5 is a cross-sectional view aa' of the magnetic belt of the present invention with the strip steel being attracted in a lifted state.
In the figure: the device comprises two magnetic belt reels 1 and 1', a permanent magnet 2, a magnetic belt 3, a pinch roll 4, a mandrel 5, a steel coil 6, a grating 7, strip steel 8 and a running direction 9 of the strip steel during threading.
Detailed Description
The invention will be further elucidated by way of example with reference to the accompanying drawings.
The uncoiling and threading process relates to main equipment comprising an uncoiler, a magnetic belt and a pinch roll; the uncoiler mainly comprises a mandrel and a series of transmission devices, wherein the mandrel is provided with an axially expanding and contracting mandrel, and the mandrel of the uncoiler can rotate clockwise or anticlockwise under the drive of the series of transmission devices; the magnetic belt mainly comprises two belts, four permanent magnets, two belt conveyor drums and the like, and the belts can rotate clockwise and anticlockwise under the drive of the two drums. The magnetic belt takes the winding drum 1' as a hinge point and moves according to an arc motion track by taking the hinge point as a center. When the magnetic belt starts to work, the 1-reel 1' in the figure is taken as a hinge point, the belt moves along an arc motion track in a counterclockwise direction, and when the belt contacts the steel strip on the outermost circle of the steel coil, the belt presses down a stop position, such as the position of a dotted line in the figure 2, and the position is the working position of the magnetic belt; when the magnetic belt moves to a non-working position from a working position, the winding drum 1' is used as a hinge point, the magnetic belt moves in an arc motion track in a clockwise direction, when the magnetic belt moves to the position, the magnetic belt stops moving, and the position is the non-working position. The magnetic belt is used for absorbing the strip steel and conveying the strip head of the steel coil to the pinch roll, and is an important ring in the strip threading process.
The pinch roll 4 is generally positioned at the rear part of the magnetic belt, and consists of two rolls, wherein the lower roll is a fixed driven roll, the roll surface is chrome-plated, the upper roll is a swingable driving roll, the roll surface is a rubber roll, and the upper roll can be pressed and lifted under the drive of a series of auxiliary equipment. At the start of threading, the pinch rolls are in an open position to receive the tape head. When the strip head detects that the strip steel passes through the pinch roll through a grating 7 arranged behind the pinch roll, the pinch roll is closed. The closed pinch roll forwards conveys the head of the strip steel in the strip threading process, provides forward power for the strip steel and prevents the strip steel from being piled.
In the process of producing thin strip steel (less than 0.7 mm), an uncoiler pausing and reversing program is added in a normal uncoiling and strip threading program, when strip steel passes through a pinch roll, a first grating detects that the uncoiling program of the strip steel is paused, and a mandrel of the uncoiler, a steel coil and a magnetic belt stop rotating; the magnetic belt is lifted up, the magnetic belt is changed from a working position to a non-working position, then the uncoiler rotates anticlockwise for 0.1-0.3 m and stops rotating, and finally the strip steel is continuously threaded to move rightwards along the direction (9) shown in the figure.
Referring to the attached drawings, the magnetic belt mainly comprises two belts 3, four permanent magnets 2 and two belt conveyor drums 1 and 1', and the magnetic belt has the function of adsorbing strip steel and conveying a steel coil head to a pinch roll, which are important rings in the process of threading the strip steel and simultaneously cause the strip steel to be off-tracking. The concrete operation steps of the method are as follows by taking a steel coil with the thickness of DX53D + Z being 0.43 mm multiplied by 1350 mm as a sample material:
1. threading and rolling: sleeving a steel coil 6 on a mandrel 5 of an uncoiler (the steel coil must be placed on the central line of a unit during coiling), wherein after the mandrel expands tightly, the surface of the inner ring of the steel coil is in close contact with the outer surface of the expanded mandrel, the steel coil and a winding drum cannot move relatively, and the strip head is positioned at the arc part at the left lower part of the outermost ring of the steel coil when viewed from the side;
2. uncoiling: after the mandrel 5 expands tightly, the surface of the inner ring of the steel coil is in close contact with the outer surface of the expanded mandrel 5, the magnetic belt is pressed down by taking the winding drum 1' as a hinge point and moves along an arc motion track in a counterclockwise direction, and when the belt contacts the steel strip on the outermost ring of the steel coil, the pressing-down stop position is shown as a dotted line position in fig. 2; then the mandrel drives the steel coil to rotate together along the anticlockwise direction (the direction opposite to the steel coil rotating arrow in the figure 2), meanwhile, the magnetic belt rotates clockwise (the direction opposite to the steel coil rotating arrow in the figure 2) at the speed synchronous with the mandrel, when the tape head is adsorbed on the magnetic belt, the mandrel and the magnetic belt stop rotating, and at the moment, the tape head is positioned at the arc part at the upper right of the outer ring of the steel coil when viewed from the side;
3. threading: when threading, the mandrel 5 and the steel coil 6 rotate clockwise, and the magnetic belt is in a working position (a dotted line position in fig. 2) and the mandrel 5 drives the strip steel to move along the direction 9 at a synchronous speed; the pinch rolls 4 are in an open position to receive the strip head before it enters the pinch rolls 4. When the strip head detects that strip steel passes through the pinch roll through a grating 7 arranged behind the pinch roll, the pinch roll 4 is closed;
4. the unwinding procedure is suspended: when the grating detection 7 detects a tape head, the uncoiling program is suspended, the mandrel 5, the magnetic belt 3 and the pinch roll 4 stop rotating, then the magnetic belt moves in an arc motion track in a clockwise direction from a working position to a non-working position by taking the winding drum 1' as a hinge point, and the magnetic belt stops moving when the magnetic belt moves to an imaginary line position;
5. the uncoiler reverses: when the magnetic belt moves to a non-working position, the mandrel 5 drives the steel coil 6 to rotate anticlockwise for 0.1-0.3 m and then stop rotating, meanwhile, the pinch roll 4 drives the strip steel to only receive the friction force and the pressure of the pinch roll 4, the strip steel rotates at the speed synchronous with the mandrel 5 and stops rotating with the mandrel 5, strip steel normally starts to penetrate after the strip steel is not adsorbed on the magnetic belt after the reversal is completed, and at the moment, the strip steel only receives the friction force and the pressure of the pinch roll 4 and the tension between the pinch roll 4 and the steel coil 6;
6. continuously threading: the pinch roll 4 and the mandrel 5 rotate at a synchronous speed to drive the strip steel to move forwards along the direction 9.
Claims (1)
1. A method for preventing thin strip steel from deviating in the uncoiling and strip threading process of a cold-rolled galvanizing line is characterized by comprising the following steps of: through the decoiler reversal, changed the tension of belted steel between pinch roll and the decoiler, made the tension of belted steel be greater than the suction of magnetic force belt to there is the belted steel of wave shape no longer to adsorb on the magnetic force belt, make belted steel only receive the frictional force and the pressure of pinch roll to drive belted steel and continue to move on the central line and wear the area, concrete step is as follows:
firstly, coil penetration: sleeving a steel coil on a mandrel of an uncoiler, wherein after the mandrel expands tightly, the surface of the inner ring of the steel coil is in close contact with the outer surface of the expanded mandrel, the steel coil and the mandrel cannot move relatively, and the strip head is positioned at the arc part at the left lower part of the outermost ring of the steel coil when viewed from the side;
unwinding: after the mandrel is expanded, the surface of the inner ring of the steel coil is in close contact with the outer surface of the expanded mandrel, the magnetic belt is pressed down by taking the winding drum as a hinge point, moves along an arc motion track in an anticlockwise direction, and stops pressing down when the belt contacts the steel strip on the outermost ring of the steel coil; then the mandrel drives the steel coil to rotate together in the anticlockwise direction, meanwhile, the magnetic belt rotates at the speed synchronous with the mandrel, when the tape head is adsorbed on the magnetic belt, the mandrel and the magnetic belt stop rotating, and at the moment, the tape head is positioned on the arc part at the upper right of the outer ring of the steel coil when viewed from the side;
thirdly, threading the belt: when threading, the mandrel and the steel coil rotate clockwise, and the magnetic belt is in a working position and the mandrel drives the strip steel to move along the forward direction at a synchronous speed; when the strip head enters the pinch roll, the pinch roll is in an open position to receive the strip head, and when the strip head detects that strip steel passes through the pinch roll through a grating arranged behind the pinch roll, the pinch roll is closed;
fourthly, pausing the uncoiling procedure: when the grating detects a strip head, the uncoiling procedure is suspended, and the mandrel, the magnetic belt and the pinch roll stop rotating;
lifting the magnetic belt to a non-working position: the magnetic belt moves in an arc motion track in a clockwise direction by taking the winding drum as a hinge point from a working position to a non-working position, and stops moving when the magnetic belt moves to a position;
sixthly, reversing the uncoiler: when the magnetic belt moves to a non-working position, the magnetic belt stops rotating, the mandrel drives the steel coil to rotate anticlockwise for 0.1-0.3 m, meanwhile, the pinch roll drives the strip steel to only receive the friction force and the pressure of the pinch roll, the strip steel rotates at the speed synchronous with the mandrel and stops rotating with the mandrel at the same time, the strip steel normally starts to penetrate after being not adsorbed on the magnetic belt after the reversal is completed, and at the moment, the strip steel only receives the friction force and the pressure of the pinch roll and the tension between the pinch roll and the steel coil and is not subjected to transverse disturbance power any more;
and seventhly, continuously threading the belt: the magnetic belt is in a non-working position, the pinch roll is in a closed state, the mandrel is in an expansion state, and then the pinch roll and the mandrel rotate at a synchronous speed to drive the strip steel to move forwards.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910963560.XA CN110871215B (en) | 2019-10-11 | 2019-10-11 | Method for preventing thin strip steel from deviating in uncoiling and strip threading process of cold-rolled galvanized wire |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910963560.XA CN110871215B (en) | 2019-10-11 | 2019-10-11 | Method for preventing thin strip steel from deviating in uncoiling and strip threading process of cold-rolled galvanized wire |
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| CN110871215A CN110871215A (en) | 2020-03-10 |
| CN110871215B true CN110871215B (en) | 2021-03-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5594734A (en) * | 1979-01-08 | 1980-07-18 | Hitachi Ltd | Belt wrapper |
| CN101003065B (en) * | 2006-01-18 | 2010-05-12 | 宝山钢铁股份有限公司 | Method and device for rectifying deviation of steel band |
| CN202963279U (en) * | 2012-09-27 | 2013-06-05 | 上海梅山钢铁股份有限公司 | Electromagnetic guide plate device for strip steel |
| CN105270899B (en) * | 2014-06-12 | 2017-05-24 | 上海梅山钢铁股份有限公司 | Double-channel guide plate switching platform for strip steel |
| CN206997395U (en) * | 2017-07-14 | 2018-02-13 | 首钢京唐钢铁联合有限责任公司 | Belt winding aid |
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