EP3670013A1 - Coiling device - Google Patents

Abstract

The purpose of the present invention is to provide a coiling device in which a steel plate entering a coiler in a hot-rolling line is appropriately wound around a coiler mandrel. A coiling device according to one embodiment of the present invention may comprise: a pinch roll part provided with an upper pinch roll to bend a steel plate; a coiling-model calculator which calculates the weight and moving distance of the upper pinch roll according to material information about the steel plate, and moves the position of the upper pinch roll along the traveling direction of the steel plate; a position controller which moves the vertical position of the upper pinch roll according to the calculation values of the coiling-model calculator; and a coiler part which coils the steel plate that is bent by the pinch roll part.

Description

[Technical Field]
• The present disclosure relates to a coiling device.
[Background Art]
• In general, during a coiling operation in a hot-rolling line, a leading end of a strip is bent in a downward direction while passing through a pair of pinch rolls. The leading end of the bent strip then wraps around a mandrel between the mandrel and a wrapper roll surrounding the mandrel. After a certain time has elapsed, the mandrel expands in circumferential and outward directions to apply tension between the pinch roll and the mandrel, to perform the coiling operation.
• Since the pair of pinch rolls, described above, are fixed regardless of a thickness, a type, an initial shape, or the like of the strip, it is difficult to obtain a desired bending shape with respect to the leading end of the strip in a case of an ultra-thin material or an ultra-thick material. Therefore, there are problems of deteriorating coiling qualities, such as the occurrence of a kink phenomenon or the like in the case of the ultra-thick material, and the occurrence of a non-tension phenomenon or the like in the case of the ultra-thin material.
• The related prior art inventions may be easily understood with reference to Korea Patent Publication No. 10-2000-0043440 .
[Disclosure] [Technical Problem]
• An aspect of the present disclosure is to provide a coiling device capable of effectively coiling a steel plate entering a coiler in a hot-rolling line around a coiler mandrel.
[Technical Solution]
• According to an aspect of the present disclosure, a coiling device includes a pinch roll unit having an upper pinch roll to bend a steel plate; a coiling-model calculator calculating values of a load and a moving distance of the upper pinch roll in accordance with material information of the steel plate, to move a position of the upper pinch roll in a traveling direction of the steel plate; a position controller moving a vertical position of the upper pinch roll in accordance with calculated values of the coiling-model calculator; and a coiler unit coiling the steel plate bent by the pinch roll unit.
[Advantageous Effects]
• According to an aspect of the present disclosure, a desired bending shape may be obtained to ensure stable coiling qualities.
[Description of Drawings]
• FIG. 1 is a configuration diagram schematically illustrating a coiling device according to an embodiment of the present disclosure.
• FIG. 2 is a flowchart schematically illustrating an operation of a coiling device according to an embodiment of the present disclosure.
[Best Mode for Invention]
• Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present disclosure.
• FIG. 1 is a configuration diagram schematically illustrating a coiling device according to an embodiment of the present disclosure.
• Referring to FIG. 1, a coiling device 100 according to an embodiment of the present disclosure may include a coiling-model calculator 110, a position controller 120, a pinch roll unit 130, and a coiler unit 140.
• The coiling-model calculator 110 may calculate values of a load and a moving distance of an upper pinch roll 132 of the pinch roll unit 130 in accordance with material information of a steel plate s, to adjust bending of the steel plate s.
• The material information of the steel plate s may be at least one of a thickness, a type, and an initial shape of the steel plate s.
• The position controller 120 may control the position of the upper pinch roll of the pinch roll unit 130 according to the calculated value of the coiling-model calculator 110.
• The pinch roll unit 130 may include the upper pinch roll 132 and a lower pinch roll 133 in a housing 131. The upper pinch roll 132 and the lower pinch roll 133 may be included in separate housings, respectively. Due to rotation operations of the upper pinch roll 132 and the lower pinch roll 133, the steel plate s drawn between the upper pinch roll 132 and the lower pinch roll 133 may be bent. The pinch roll unit 130 may include a position moving cylinder 134, a vertically moving cylinder 135, and a hinged block 136.
• The position moving cylinder 134 may move the upper pinch roll 132 in a traveling direction of the steel plate s, and the vertically moving cylinder 135 may move the upper pinch roll 132 in a height direction, perpendicular to the traveling direction of the steel plate s.
• The coiler unit 140 may include a mandrel 141 and a unit roll 142, to coil the bent steel plate s.
• FIG. 2 is a flowchart schematically illustrating an operation of a coiling device according to an embodiment of the present disclosure.
• Referring to FIG. 2 together with FIG. 1, the coiling-model calculator 110 may obtain the material information, for example, the thickness, a type, or the initial shape of the steel plate when the steel plate s enters the pinch roll unit 130, and may use the obtained material information to calculate values of a pressure of the upper pinch roll 132 and a moving distance of the upper pinch roll in the traveling direction of the steel plate, in the bending of the steel plate (S10) . The coiling-model calculator 110 may adjusts the bending of the steel plate in accordance with the following equations:
• Load of Upper Pinch Roll: F = α×P $$P=\frac{t^2\times w}{4}\times {\sigma }_{\mathit{strip}}\times \beta$$

  
• Moving Distance of Upper Pinch Roll: $S=\frac{Q}{\delta }$

  

  $$Q=\frac{t^3\times w}{60\times D}\times {\sigma }_{\mathit{strip}}$$

  
• Where α is a proportional coefficient, β is a shape coefficient of the steel plate, δ is a bending coefficient of the steel plate, t is a thickness of the steel plate, w is a width of the steel plate, σ_strip is yield strength of the steel plate, and D is a diameter of a mandrel of the coiler unit.
• The calculated values may be used to calculate values of the load and the moving distance of the upper pinch roll for each material of the steel plate, and, based on the thus obtained values, movement of the position moving cylinder 134 in the traveling direction of the steel plate s may be controlled, to move the upper pinch roll 132 in the traveling direction of the steel plate s.
• In addition, since the position moving cylinder 134 is also mounted on the housing 131 to fix the upper pinch roll 132 thereto, the coiling device may absorb impacts when entering the steel plate. In addition, the position moving cylinder 134 may be mounted on an inlet and an outlet of the upper pinch roll 132, respectively, to fix a housing of the upper pinch roll 132.
• As the upper pinch roll 132 moves in the traveling direction of the steel plate, the vertically moving cylinder 135 applying pressure to the upper pinch roll may be provided with the hinged block 136, to be rotatable.
• The position controller 120 may control the vertically moving cylinder 135 in accordance with the following equation, with respect to the moving distance calculated by the position moving cylinder 134, to move the upper pinch roll 132 in the height direction (S20):
• Moving Distance of Vertically Moving Cylinder in Height Direction: $Y=\gamma \times \sqrt{\left(S^2+G^2\right)}$

  
• Where r is an adjustment coefficient, S is a moving distance of the upper pinch roll, and G is a roll gap of the vertically moving cylinder.
• For example, the position moving cylinder 134 and the vertically moving cylinder 135 may be provided to move the upper pinch roll 132 on two axes, to adjust the bending of the steel plate (s) in the desired position (S30).
• As described above, according to the present disclosure, a desired bending shape may be obtained by moving the upper pinch roll in the coiling direction to adjust the bending from the material information such as a thickness, type, or the like of the steel plate material entering the hot-rolled coiler, to ensure stable coiling qualities.
• While example embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims (5)

1. A coiling device comprising:

   a pinch roll unit having an upper pinch roll to bend a steel plate;

   a coiling-model calculator calculating values of a load and a moving distance of the upper pinch roll in accordance with material information of the steel plate, to move a position of the upper pinch roll in a traveling direction of the steel plate;

   a position controller moving a vertical position of the upper pinch roll in accordance with calculated values of the coiling-model calculator; and

   a coiler unit coiling the steel plate bent by the pinch roll unit.
2. The coiling device according to claim 1, wherein the material information of the steel plate is at least one of a thickness, a type, and an initial shape of the steel plate.
3. The coiling device according to claim 2, wherein the coiling-model calculator calculates values of the load and the moving distance of the upper pinch roll in accordance with the following equations:

   Load of Upper Pinch Roll: F = α×P $$P=\frac{t^2\times w}{4}\times {\sigma }_{\mathit{strip}}\times \beta$$

   

   Moving Distance of Upper Pinch Roll: $S=\frac{Q}{\delta }$

   

   $$Q=\frac{t^3\times w}{60\times D}\times {\sigma }_{\mathit{strip}}$$

   

   Where α is a proportional coefficient, β is a shape coefficient of the steel plate, δ is a bending coefficient of the steel plate, t is a thickness of the steel plate, w is a width of the steel plate, σ_strip is yield strength of the steel plate, and D is a diameter of a mandrel of the coiler unit.
4. The coiling device according to claim 1, wherein the pinch roll unit further comprises:

   a position moving cylinder moving the upper pinch roll in the traveling direction of the steel plate; and

   a vertically moving cylinder moving the upper pinch roll in a height direction, perpendicular to the traveling direction of the steel plate.
5. The coiling device according to claim 4, wherein the position controller controls a moving distance of the vertically moving cylinder in accordance with the following equation:
   Moving Distance of Vertically Moving Cylinder in Height Direction: $Y=\gamma \times \sqrt{\left(S^2+G^2\right)}$

   

   Where r is an adjustment coefficient, S is a moving distance of the upper pinch roll, and G is a roll gap of the vertically moving cylinder.

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