JPH07144807A - Tension correcting device for carrousel reel - Google Patents

Abstract

PURPOSE:To suppress a fluctuation and stabilize a correction by monitoring the roll driving current, calculating the deviation between the current before the revolution of a carrousel reel and the current at the time of the revolution, calculating the fluctuation quantity of tension, and determining the forcing quantity of a tension reel. CONSTITUTION:A tension correcting device 1 stores the current feedback value outputted from a drive device 10 driving/controlling the motor of a bridle roll 102 winding a thin plate 101 in a memory section 2 as the current value before a revolution. The deviation between the current feedback value when a revolution start command is inputted and the stored current value is calculated in an arithmetic section 3 as a tension fluctuation. The forcing quantity of a carrousel tension reel is calculated in an arithmetic section 4 based on the calculated deviation. The calculated forcing quantity is multiplied by the prescribed adjusting factor coefficient (gain) in a multiplication section 5, and the correction quantity due to the current deviation is calculated and outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for accurately and efficiently compensating the tension of a carousel reel during revolution.

[0002]

2. Description of the Related Art Recently, a carousel reel, which can reduce the equipment space and the equipment cost, has become the mainstream as a winder for a cold line.

FIG. 4 shows a structure around a winder of a general cold line using a carousel reel.

As shown in FIG. 4, the thin plate 101 passes through a bridle roll 102, a front pinch roll 103, and a deflector roll 104 in that order and is wound up by a carousel reel 105. The carousel reel 105 is provided with two tension reels 106 and 107 with its center of rotation being symmetrical. When the winding by the tension reel 106 is completed, the carousel reel 105 revolves 180 degrees and then the tension reel 106 is rotated. Reel 10
The winding by 7 is started. In this way, the carousel reel 105 enables continuous winding work by changing the mechanical position of the tension reel.

However, if the carousel reel 105 revolves during winding, tension fluctuations occur in the thin plate 101. If this is left unattended, plate breakage, plate narrowing, winding deviation, etc. occur, so it is necessary to compensate for this tension fluctuation.

Conventionally, in the tension correction during revolving of the carousel reel, the plate length that changes momentarily during revolving is detected, and the forcing amount for the tension reel is corrected from this detected value. This conventional tension correction will be specifically described with reference to FIG.
The plate length change ΔL is obtained by the following equation.

[0007]

[Formula 1] ΔL = L ₁ −L ₁₀ +1 (mm) where L ₁ is the plate length at the revolution angle θ ₁ (deg) L ₁₀ is the plate length at the revolution angle θ ₁ = 0 (deg) l: Revolved Winding plate length of mandrel rotation Further, the plate lengths L ₁ , L ₁₀ and l are respectively calculated by the following equations.

[0008]

[Formula 2] L ₁ = πD ₁ (90 ° -β-α) / 360 ° + [E ² + D ² + C ² + 2E (Ccos θ-D sin θ)-{(D ₂ -D ₁ ) / 2} ² ] ^{1 / 2} + πD ₂ (90 ° + β + α) / 360 ° (1)

Equation 3] L ₁₀ = 700π (90 ° -β-α) / 360 ° _{+ {11499399.41+ (D 2/2} + 350) 2} 1/2 + πD 2 (90 ° + β + α) / 360 ° (2)

Equation 4] _{l = 1.5πD 2 (θ 1/} 360 °) ... (3) _{^{where, β = sin -1 (D 2}} -D 1) / 2S (deg) α = tan -1 B / A (deg ) S = (A ² + B ² ) ^1/2 A = C + Ecos θ (mm) B = D−Ecoc θ (mm) θ = 55.15 ° + θ ₁ (deg) D ₁ = 700 (mm) E = 1050 (mm) D = 3038 (mm) C = 2000 (mm) L ₁ = l ₁ + l ₂ + l ₃ θ ₁ ′ = 34.85 ° −θ ₁ Actually, in order to obtain the plate length change which changes momentarily, The deviation between the plate length obtained by the formulas (1) to (3) and the predicted plate length considering the revolution speed reference is obtained.

[0009]

[Formula 5] Δθ = 360 ° × 4 (rpm) × speed reference ÷ (25000 × 60000) × 60 ÷ 1000 (4) The predicted plate length is Δθ and the revolving angle at the present time is added to the plate length L ₁ Is a result calculated as θ in the calculation of.

[0010]

However, the conventional tension correction described above has the following problems.

That is, in the above-mentioned conventional technique, the tension fluctuation is corrected by calculating the difference between the position transition obtained from the speed reference and the current position and adding or subtracting the change rate to the current reference. In other words, since the change in plate length is obtained from the predicted plate length, if the predicted plate length and the actual plate length differ due to mechanical disturbance or the like, it is not possible to correct for tension fluctuations.

Further, a calculation unit (controller) for plate length change
If the delay is large due to the scan cycle of 1), the correction is out of phase.

Further, when the speed of the revolution motor for driving the carousel reel changes (when the speed changes from acceleration to constant speed or from constant speed to deceleration), there is a discontinuous portion in the change in plate length, so the correction amount is also stepped. However, it has been difficult to correct it in the prior art.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a tension correction device for a carousel reel, which enables stable tension correction and which solves the above problems, at low cost. .

[0015]

To achieve the above object, the present invention is provided with a plurality of tension reels and revolves when one reel has finished winding and winds the other reel. In a device for correcting tension fluctuations in a carousel reel that starts taking, a means for monitoring a current for driving a roll, which is a master on the line output side, and storing the current just before the carousel reel revolves; Means for comparing the calculated current value with the current value at the time of carousel reel revolution, and means for calculating the deviation, and means for calculating the fluctuation of the tension from the calculated current deviation and determining the forcing amount for the tension reel. It is characterized by having.

[0016]

In the present invention, the fluctuation of the tension is detected and corrected from the current value of the roll that serves as the master of the outlet equipment such as the bridle roll. That is, the current value immediately before the carousel reel revolves is stored, and the stored current value is compared with the current value when the carousel reel revolves to obtain the deviation.
The tension variation is calculated from the obtained current deviation to determine the forcing amount for the tension reel. The tension variation is corrected by adding this forcing amount to the current reference of the tension reel.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the construction of an embodiment of a carousel reel tension correction device according to the present invention. The structure around the winder of the cold line in this embodiment is the same as that shown in FIG.

As shown in FIG. 1, this tension correction device 1
Is a pre-revolution current memory unit 2 that stores the current feedback value of the bridle roll as a current value before revolution, and a revolution start command from the drive device 10 that drives and controls the motor of the bridle roll 101. A tension fluctuation calculation unit 3 that calculates the deviation between the current feedback value and the current value immediately before the revolution stored in the pre-revolution current memory unit 2, and the forcing amount of the carousel reel tension reel from the calculated deviation. The forcing calculation unit 4 and the multiplication unit 5 for multiplying the forcing amount output from the calculation unit 4 by a predetermined adjustment factor coefficient (gain) to obtain a correction amount based on the current deviation and outputting the correction amount.

The operation of the present embodiment will be described with reference to the flow chart of FIG.

When a carousel reel revolution start command is detected (step ST1 YES), it is monitored whether or not the line speed is constant (step ST2). If the line speed is not constant, the line speed is kept constant (step ST3), and then the revolution operation is started. The line speed is kept constant in order to accurately detect the amount of current fluctuation during revolution.

Further, in response to the revolution start command, the bridle current value immediately before the revolution start is stored in the pre-revolution current memory unit 2. The bridle current value is supplied from the drive device 10. When the revolution of the carousel reel is started, first, the bridle current value is read (step ST
At the same time as 4), the current value before the revolution starts stored in the memory unit 2 is read (step ST5). Then, the tension fluctuation calculation unit 3 calculates the deviation between the bridle current value and the current value stored before the revolution starts (step ST
6), the forcing amount calculation unit 4 calculates the forcing amount for the tension reel based on this deviation,
Further, the multiplication unit 5 multiplies a predetermined gain, and the correction amount based on the current deviation is added to the current reference of the tension reel to execute PI control (step ST7). That is, if the calculation result is positive (YES in step ST8), processing for increasing the forcing of the tension reel is executed (step ST9). If the calculation result is negative (NO in step ST8), processing for reducing the forcing of the tension reel is executed (step ST10). The above process is repeatedly executed at a scan cycle of, for example, about 50 msec until the revolution is completed (step ST11).

FIG. 3 shows a change in tension when the carousel reel revolves, comparing the conventional example with this example.
This example shows the experimental result when the bridle current is converted into%.

As shown in FIG. 3 (A), when the carousel reel starts to revolve, the revolution speed increases, and FIG.
As shown in, the carousel reel revolution angle increases. At this time, in the conventional example, as shown in FIG.
Although the tension fluctuation is large, it can be seen that the tension fluctuation is small in this embodiment as shown in FIG.

As described above, according to the present embodiment, the tension fluctuation due to the mechanical factor is detected and corrected from the current of the bridle roll 102, so that the tension fluctuation due to the disturbance can be suppressed.

Further, by using together with the method of obtaining the forcing amount from the change in plate length, it is possible to reduce the fluctuation of the tension even in the discontinuous portion of the change in plate length.

Furthermore, since no special equipment such as a tension meter is provided, the tension correction device can be constructed at low cost.

[0027]

As described above, according to the present invention, stable tension control is possible. In particular, since the compensation amount can be quantitatively determined by the current of the bridle roll or the like, it is possible to accurately correct the tension fluctuation due to the disturbance and facilitate the tension adjustment.

Further, since it is not necessary to provide a detector such as a tension meter, it is possible to inexpensively construct equipment capable of performing stable tension correction.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a tension correction device for a carousel reel according to the present invention.

FIG. 2 is a flow chart explaining the operation of the embodiment shown in FIG.

FIG. 3 is an explanatory diagram showing an effect of the present embodiment in comparison with a conventional example.

FIG. 4 is a configuration diagram around a winder of a general cold line.

FIG. 5 is an explanatory diagram showing the principle of conventional tension correction.

[Explanation of symbols]

 1 Tension correction device 2 Pre-revolution current memory unit 3 Tension fluctuation calculation unit 4 Forcing amount calculation unit 5 Multiplying unit 101 Thin plate 102 Bridle roll 103 Front pinch roll 104 Deflector roll 105 Carousel reel 106, 107 Tension reel

Claims (1)

[Claims] 1. A device for correcting tension fluctuation in a carousel reel, comprising a plurality of tension reels, which revolves when winding by one tension reel is completed and starts winding by another tension reel, A means for monitoring the current for driving the roll, which is the master on the line output side, and storing the current just before the carousel reel revolves, and compares the stored current value with the current value when the carousel reel revolves. And a means for calculating the deviation, and means for calculating the fluctuation of the tension from the calculated current deviation and determining the forcing amount for the tension reel. .