RU2036034C1 - Method to form coil and fix strip end on winder drum in process of thin strips winding - Google Patents

Abstract

FIELD: metal strips cold rolling production. SUBSTANCE: method provides for mechanical straightening and bending of strip end to drum with following its pressing and bending by compressed air streams. Air is fed automatically with time delay after fixation of moving strip end during its enter mouth of wrapping machine. Method provides much qualitative formation of coil and therefore better stability of rolling process, facilitates process of strip end fixation in drum due to decrease of skidding between strip wraps. EFFECT: method is used in strips cold rolling production. 1 dwg

Description

 The invention relates to rolling production, in particular the production of cold rolled strips, and can be used for fastening and winding thin strip materials in various industries.

 Known methods of securing the ends of the strips on the reels of coilers.

 There is a known method in which the end of the strip is secured to the reel drum by covering and pressing several, for example, woolen belts mounted on the rollers of the feeding trolley, at a drum rotating at a filling speed.

 In this way, a strip with a thickness of 1-2.5 mm is satisfactorily fixed.

 With a thickness of 0.16-1 mm, rigid belts with an uncontrolled pressing force to the drum do not provide centering of the strip along the axis of the mill (aggregate), form folds in the turns and lead to poor-quality roll formation.

 In addition, woolen belts are expensive to manufacture, and in operation require replacement once or twice a month.

 The existing method of securing the strip with jets of compressed air is as follows.

 The end of the strip supplied to the drum is pressed against the surface of the drum rotating at a filling speed by jets of compressed air coming from the annular air duct.

 In this method, the refueling of the deformed ends of the strips is either not feasible, or the roll forming occurs with slipping and wrinkling due to looseness of the turns, and therefore, increases the time of fixing the end of the strip on the drum.

 The end of the strip, moving along the ring wiring, is braked on its surface. Braking also occurs at the beginning of the end of the run to the second turn about the plane of the strip supplied to the ring wiring in the throat of the stripper. As a result of braking, leaks (loops) occur in the turns on the drum, leading to the formation of folds and poor-quality roll formation.

 The sealing of the turns by this method may be insufficient, which causes further displacement of the turns of the roll along the axis of the drum (sliding of the roll), leading to the formation of a poor-quality roll.

 The inclusion of compressed air before the beginning of the movement of the end of the strip manually by this method creates additional braking of the end of the strip relative to the rotating drum and the speed of the supplied strip, since the end of the strip is not yet pressed against the drum, and the air jets that hit the drum in front of the end of the strip prevent it from moving, which leads to a slip of the coil on the drum, leaks of subsequent turns and an increase in the time to fix the end of the strip.

 The aim of the invention is to improve the quality of the roll forming and accelerate the fastening of the end of the strip.

 Improving shaping is achieved by correcting the deformed end of the strip; bending at the beginning and end of the formation of the first turn to reduce braking and the occurrence of leaks of the fit of the coil to the drum, eliminating loops and folds when winding subsequent turns.

 The acceleration of the fastening of the end of the strip on the drum is ensured by reducing the braking of the ends of the strip at the beginning and end of the winding, as well as reducing the braking along the annular guide, reducing the slip time by compressing, with an adjustable force, the deformed ends and ensuring that the strip is centered along the axis of the mill.

 The purpose of the invention is achieved by the fact that in the method of forming the roll and securing the end of the strip when winding thin strips, including feeding the end of the strip to a drum rotating at a filling speed, gripping the end of the strip, forming the first turns while pressing the strip against the drum using an annular guide and streams of compressed air directed tangentially to the surface of the drum with subsequent fastening of the end of the strip, while capturing the end of the strip, it is straightened with simultaneous pressing and bending to the the drum surface with adjustable force, when the strip is fed into the stripper, the appearance of its end is recorded, and the strip is pressed against the drum with compressed air during the formation of the first turn after the moment of fixing its end with a time delay to partially bend the end of the drum strip along the ring guide, at the same time completion of the first turn carry out an additional bending of the end of the strip to the drum with compressed air, and the formation of the second and subsequent turns is carried out with an adjustable pressing force. Adjustable pressing force of the end of the strip allows self-centering of the strip along the axis of the mill (unit) without the occurrence of folds in the first turns of the strip.

 The drawing shows a diagram of the shaping and fixing the end of the strip on the reel drum.

 The purpose of the invention is achieved by unequivocally correcting the curvature of the end of the strip with an adjustable clamping force, as well as bending it to the drum when entering the ring wiring above the drum, which improves the quality of the front end, reduces its braking when moving with the drum and generally improves the shape of the roll.

 The inclusion of compressed air jets after the end of the strip passes through a part of the drum circumference due to the fixation of the end entering the stripper allows the end pressed to the drum to more easily and quickly overcome the forces of compressed air jets that hit the drum in front of the end of the moving strip, which reduces the possibility of slipping of the turns of their leakage (loops), speeds up the fastening of the end, and generally improves the roll forming, its quality and the rolling process itself.

 The bending of the end of the strip at the moment of completion of the first turn accelerates the process of fixing it on the drum due to the reduction of braking along the strip coming from the mill (unit), and also reduces the formation of leaks in the turn.

 EXAMPLE 1. At a training mill 1200, the end of strip 1 along the wire table 2 is set into the correct folding device 3, which presses the end to the rotating in the drum 4. The shaped end is fed with the correct folding device together with the reel drum along the ring guide 5 to a given point on the circumference of the drum without turning on compressed air.

 The inclusion of compressed air coming from the nozzles 6 is carried out after fixing the end at the inlet of the stripper with an electromagnetic sensor 7 with a time delay for the passage of this end to a given point of the circle.

 Bending of the end of the strip with compressed air jets from individual nozzles 8 to the drum is performed at the moment of formation of the second turn.

 The second, if necessary, and subsequent turns, are formed under the action of the correct-folding device and jets of compressed air.

 High-quality undeformed ends can be fixed already on the second turn of the strip.

 If slipping occurs during refueling of poor-quality ends, additional sealing of the turns is carried out by pressing the correct-folding device with maximum force with the stripper allotted for some distance with the movable lever 9 folded out to increase the annular gap in the fixed lever, which is necessary for the formation of a certain number of turns on the drum.

 The optimal pressing force of the correct-folding device is selected in each individual case from the condition of ensuring self-centering of the strip during the formation of the first turns, taking into account the deformation forces of the dressing and shaping of the first turns.

Claims (1)

 METHOD FOR FORMING THE ROLL AND ATTACHING THE END OF THE STRIP ON THE DRUM DRINER WHEN WINDING THIN STRIPS, including feeding the end of the strip to a drum rotating at a filling speed, gripping the end of the strip, forming the first turns while pressing the strip against the drum using the ring guide and the ring guide jets of compressed air, followed by fixing the end of the strip, characterized in that when capturing the end of the strip, it is straightened with simultaneous pressing to the surface drum with adjustable force, when the strip is fed into the stripper, the appearance of its end is recorded, and the strip is pressed against the drum with compressed air during the formation of the first turn after the moment of fixing its end with a time delay to partially bend the end of the drum strip along the ring guide, at the time of completion the first turn carry out additional bending of the end of the strip to the drum with compressed air, and the formation of the second or subsequent turns is carried out with an adjustable pressing force.

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