阅读说明：本技术 卷绕机以及用于控制第二压区压力的方法 (Winder and method for controlling the pressure of a second nip ) 是由 T·塔尔维蒂耶·塔皮奥 P·瓦尼奥 J·格吕扎戴蒂斯 于 2018-04-06 设计创作，主要内容包括：提供了一种用于卷绕精轧辊(110)的卷绕机(100),精轧辊(110)具有由在半径为rc的芯(115)上的片材(M)组成的半径(R)。卷绕机(100)包括：支撑鼓组件(120),布置在精轧辊(110)的第一侧上,并且被配置为从第一侧支撑精轧辊(110)；浮动辊(130),布置在精轧辊(110)的与第一侧相对的第二侧上,并且被配置为将第一压区压力从第二侧施加到精轧辊(110)上,该精轧辊(110)由支撑鼓组件(120)支撑；以及控制单元(140),被配置为依据浮动辊(130)的上升率(AR)来自适应地控制由浮动辊(130)施加到精轧辊(110)上的第二压区压力。(A winding machine (100) is provided for winding a finishing roll (110), the finishing roll (110) having a radius (R) comprised of a sheet (M) on a core (115) having a radius rc. A winding machine (100) comprises: a support drum assembly (120) disposed on a first side of the finishing roll (110) and configured to support the finishing roll (110) from the first side; a dancer roll (130) disposed on a second side of the finishing roll (110) opposite the first side and configured to apply a first nip pressure to the finishing roll (110) from the second side, the finishing roll (110) supported by the support drum assembly (120); and a control unit (140) configured to adaptively control the second nip pressure applied by the dancer roll (130) onto the finishing roll (110) in dependence on the rate of rise (AR) of the dancer roll (130).)

1. A winding machine (100) for winding a finishing roll (110), the finishing roll (110) having a roll diameter r_cOf sheets (M) on a core (115), the winder (100) comprising:

a support drum assembly (120) arranged on a first side of the finishing roll (110) and configured to support the finishing roll (110) from the first side;

a dancer roll (130) disposed on a second side of the finishing roll (110) opposite the first side and configured to: providing a second nip pressure onto the finishing roll (110) from the second side while the finishing roll (110) is supported by the support drum assembly (120); and

a control unit (140) configured to: -adaptively controlling the second nip pressure applied by the dancer roll (130) onto the finishing roll (110) in dependence of the rate of rise (AR) of the dancer roll (130).

2. The winding machine according to claim 1, wherein the control unit (140) is configured to: calculating a rate of rise (AR) of the dancer roll based on the radius (R) of the finishing roll (110), a rate (v) at which the sheet (M) is fed to the finishing roll (110), a thickness (d) of the sheet (M), and a geometry of the winder (100).

3. The winding machine according to claim 1 or 2, wherein the first nip pressure is generated between the finishing roll (110) and the support drum assembly (120) by the first nip pressure and a weight of the finishing roll, and wherein the control unit (140) is configured to: the first nip pressure is adaptively controlled to obtain a constant or slightly reduced first nip pressure.

4. The winding machine according to claim 1, wherein the adaptivity of the control unit (140) is a function of the rate of rise (AR) of the dancer roll (130).

5. The winding machine according to any of claims 1 to 4, further comprising an actuator (150), the actuator (150) being connected to the dancer (130) and configured to adjust the first nip pressure, wherein the actuator is operatively connected to the control unit (140).

6. The winding machine according to any one of claims 1 to 5, wherein the support drum assembly (120) is configured to feed the sheet material (M) to the finishing roll (110).

7. Spooling machine according to any of claims 1 to 6, wherein the support drum assembly (120) comprises at least a first drum (122) having a radius (r).

8. Spooling machine as claimed in claim 7, wherein the support drum assembly (120) comprises a second drum (124), the second drum (124) having a radius (r) and being arranged at a distance (2s) from the first drum (122).

9. The winding machine of claim 8, wherein the control unit (140) is configured to: calculating the rate of rise (AR) of the dancer roll based on the radius (R) of the finishing roll (110), a rate (v) at which the sheet (M) is fed to the finishing roll (110), a thickness (d) of the sheet (M), radii (R) of the first drum (122) and the second drum (124), and a pitch(s) that is half of the distance (2s) between the first drum (122) and the second drum (124).

10. The winding machine according to claim 8 or 9, wherein the rate of rise (AR) is determined by the following expression (1):

wherein d is the thickness of the sheet (M),

v is the rate at which the sheet (M) is fed to the finishing roll (110),

r is the radius of the first drum (122) and the second drum (124), an

R is the radius of the finishing roll (110), an

s is a pitch which is half of the distance (2s) between the first drum (122) and the second drum (124).

11. A method for controlling a second nip pressure applied by a dancer (130) onto a finishing roll (110) during winding of a sheet (M) on the finishing roll (110), the method comprising:

supporting the finishing roll (110) by a support drum assembly (120), the support drum assembly (120) being arranged on a first side of the finishing roll (110) and configured to support the finishing roll (110) from the first side; and

adaptively controlling the second nip pressure applied by a dancer (130) onto the finishing roll (110), wherein the dancer (130) is arranged on a second side of the finishing roll (110) opposite to the first side,

wherein the second nip pressure is adaptively controlled in dependence on the rate of rise (AR) of the dancer roll (130).

12. The method of claim 11 wherein the rate of rise (AR) of the dancer roll (130) is a function of a rate of growth of the finishing roll (110) relative to the support drum assembly (120) as the sheet (M) is wound onto the finishing roll (110).

13. The method according to claim 11 or 12, wherein the rate of rise (AR) of the dancer roll is calculated based on the radius (R) of the finishing roll (110), the rate (v) at which the sheet (M) is fed to the finishing roll (110), the thickness (d) of the sheet (M), and the geometry of the winder (100).

14. The method of any of claims 11 to 13, further comprising:

controlling the second nip pressure applied from the second side to generate a constant or slightly reduced first nip pressure between the finishing roll (110) and the support drum assembly (120).

15. The method of any of claims 11 to 14, further comprising:

feeding the sheet (M) to the finishing roll (110) through the support drum assembly (120).

Technical Field

The present application relates to a winding machine and a method for controlling a second nip pressure, and in particular to a winding machine for controlling a second nip pressure in dependence on the rate of rise of a floating roll, and a method for controlling a second nip pressure applied by a floating roll to a finishing roll during winding of a sheet on the finishing roll in dependence on the rate of rise of the floating roll.

Background

A winder is a machine for winding sheet material such as paper or textile on a roll. In particular, in a winder, the sheet is wound on a core to form a finished roll. The completed roll is typically supported by a support assembly and urged against the support assembly by a dancer. To obtain a tight profile of the finished roll, the sheet should be wound on the finishing rolls under similar conditions. The size of the finishing rolls increases during the winding of the sheet on the core. Thus, the nip pressure applied by the dancer roll to the finishing roll should be controlled to obtain a tight profile and to try to keep the finishing roll inside the coiler during all running processes and not to let the finishing roll be thrown out while rotating.

In all cases, the nip pressure (nip pressure) should be controlled sufficiently well. Conventional solutions work in certain (limited) situations, but are not optimized for all emerging situations. This can lead to poor tightness profiles of the finished rolls (further post-processing and end-use problems, and roll breakage), possible front-end splice failures, roll vibration, oscillation and run-out, and even the finishing rolls can be thrown out in the run-time, which in turn can lead to fires, mechanical failures when uncontrolled friction is created between the rolls, and this is a significant safety hazard for the operator. This problem (hazard) is exacerbated in winders seeking to increase capacity through faster accelerations and higher operating speeds.

Recently, control of nip pressure has been improved by adding a feed forward (ff) component from the rate of rise of the dancer roll. The ff term, however, is never accurate enough because the valve controlling the RR nip pressure is nonlinear in many respects. The linearity depends on the temperature and viscosity of the hydraulic oil and the change in the pressure difference over the valve during reeling. Therefore, in order to obtain the best available results, it becomes important to improve the pressure controller itself by finding and using the optimal value for controlling the nip pressure.

At the beginning, when the finishing roll diameter is relatively small and the growth rate is high, a high gain is required in the nip pressure controller, and as winding is about to end, a less aggressive pressure controller is preferred when the finishing roll diameter is large and the growth rate is low. Too aggressive nip pressure controllers tend to cause vibrations and on the other hand too slow nip pressure controllers cannot withstand the required nip pressure, thus deteriorating the tightness profile of the finishing rolls.

In a recent method, a PI (proportional-integral) force controller or a pressure controller is used. The PI value is optimized by changing the gain value and the integral value with respect to the diameter of the finishing roll. This means that the PI controller is only optimal at a certain web (web) thickness and rate of increase of the diameter of the roll. As a result, optimizing the pressure controller PI value based on diameter alone does not bring the required performance for all emerging scenarios. For example, problems associated with this can be seen in possible front splices, where the instability of the dancer can undermine joint success. Also, poor control of nip pressure can expose the roll, whereby the roll can be thrown out in-between runs, causing possible fires, machine damage, and also personal safety hazards.

Disclosure of Invention

The above-mentioned deficiencies, disadvantages and problems are addressed herein by the following specification and will be understood by reading and understanding the specification. In particular, the present disclosure outlines a second nip pressure controlled winder and a method for controlling a second nip pressure that increases reliability and is capable of taking into account and/or overcoming some or all of the above disadvantages.

According to one aspect, a winding machine is provided for winding a finishing roll having a radius comprised of sheet material on a core having a radius. The winding machine includes: a support drum assembly disposed on a first side of the finishing roll and configured to support the finishing roll from the first side; a dancer roll disposed on a second side of the finishing roll opposite the first side and configured to apply a second nip pressure to the finishing roll from the second side while the finishing roll is supported by the support drum assembly; a control unit configured to adaptively control the second nip pressure applied by the dancer roll to the finishing roll in accordance with a rate of rise of the dancer roll.

According to an embodiment, the control unit may be configured to calculate the rate of rise based on the geometry of the winder and the sheet and the velocity of the sheet at which the sheet may be fed in particular to the finishing rolls. According to an embodiment, the control unit may be configured to calculate the rate of rise based on the radius of the finishing roll, the rate at which the sheet is fed to the finishing roll, the thickness of the sheet, and the geometry of the winder.

According to an embodiment, a first nip pressure is generated between the finishing roll and the support drum assembly by the second nip pressure and the, in particular, increased weight of the finishing roll. Further, the control unit may be configured to adaptively control the second nip pressure to obtain a constant or slightly decreasing first nip pressure.

According to an embodiment, the adaptivity of the control unit may be a function of the rate of rise of the dancing roll.

According to an embodiment, the winding machine may further comprise an actuator connected with the dancer roll and configured to adjust the first nip pressure. Further, the actuator can be operatively connected to the control unit.

According to an embodiment, the support drum assembly may be configured to feed the sheet to the finishing roll.

According to an embodiment, the support drum assembly may comprise at least a first drum having a radius. According to an embodiment, the support drum assembly may comprise a second drum having a radius and being arranged at a distance from the first drum. In particular, the radii of the first and second drums may be the same. Alternatively, the radii of the first and second drums may be different. For example, the second drum may have a structure with two smaller rollers with a belt in between. When practicing the embodiments, longer and better nip contact (less prone to slippage) with the transport roll may be provided.

According to an embodiment, the control unit may be configured to: the rising rate of the floating roller is calculated based on the radius of the finishing roller, the rate at which the sheet is fed to the finishing roller, the thickness of the sheet, the radii of the first and second drums, and the pitch which is half the distance between the first and second drums.

According to an embodiment, the rising rate of the dancing roller may be determined by the following expression (1):where d is the thickness of the sheet, v is the rate at which the sheet is fed to the sheet of the finishing rolls, R is the radius of the first and second drums, R is the radius of the finishing rolls, and s is the spacing that is half the distance between the first and second drums.

According to one aspect, a method is provided for controlling a first nip pressure applied by a dancer to a finishing roll during winding of a sheet on the finishing roll. The method comprises the following steps: supporting the finishing roll by a support drum assembly, which is disposed on a first side of the finishing roll and configured to support the finishing roll from the first side; and adaptively controlling a first nip pressure applied to the finishing roll by the dancer roll, wherein the dancer roll is disposed on a second side of the finishing roll opposite the first side, wherein the first nip pressure is adaptively controlled as a function of a rate of rise of the dancer roll.

According to an embodiment, the rate of rise of the dancer roll may be a function of the rate of rise of the finishing roll relative to the support drum assembly as the sheet is wound onto the finishing roll.

According to an embodiment, the rate of rise of the press rolls may be calculated based on the geometry of the winder and the sheet and the velocity of the sheet at which the sheet may be fed in particular to the finishing rolls. According to an embodiment, the rising rate of the dancer roll may be calculated based on the radius of the finishing roll, the speed at which the sheet is fed to the finishing roll, the thickness of the sheet, and the geometry of the winder.

According to an embodiment, the second nip pressure applied from the second side may be controlled to generate a constant or slightly reduced first nip pressure between the finishing roll and the support drum assembly.

According to an embodiment, the sheet may be fed to the finishing roll through a support drum assembly.

Drawings

So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the disclosure, briefly summarized above, may be had by reference to embodiments. The accompanying drawings relate to embodiments of the disclosure and are described below:

FIG. 1 shows a schematic view of a winder according to an embodiment; and

fig. 2 shows a flow chart illustrating a method for controlling a first nip pressure according to an embodiment.

Embodiments are also directed to apparatuses for performing the disclosed methods and include apparatus portions for performing each of the described method aspects. These method aspects may be performed by hardware components, by a computer programmed by appropriate software, by any combination of the two, or in any other manner. Still further, embodiments according to the present disclosure also relate to methods for operating the described apparatus. Methods for operating the described apparatus include method aspects for performing the functions of the apparatus.