JPS62126071A - Accumulator control device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a fluctuation in tension exerted on a material during release from brake, by providing a torque computing circuit which previously determines tension exerted on the material during release from brake. CONSTITUTION:An accumulator part 2 continuously conveys a material 6 in the direction of an arrow mark by means of a roll 5 on the incoming side. The material 6 is wound in the shape of a hair pin around fixed rolls 7a, 7b, 7c, and 7d of a fixed roll group 7 and elevating rolls 8a, 8b and 8c of an elevating roll group 8, a given amount is stored, and thereafter is conveyed to a subsequent process through a roll 9 on the outgoing side. Elevating motion and fixing of the elevating roll group 8 are effected with the aid of a driving motor 3 and a brake 10. A driving motor 3 is controlled by a control part 4. The control part 4 is formed with a roll-on-incoming-side speed detector 11, a roll-on-outgoing-side speed detector 12, a speed computing circuit 13, a tension setter 14, a tension detector 15, a tension control circuit 16, a speed control circuit 17, a current control circuit 18, a power converting device 19, a base weight setter 21, serving as a bias correcting means 20, and a torque computing correcting circuit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an accumulator control device for a process line, and more particularly to an accumulator control device that suppresses tension fluctuations in a material when a brake is released.

[Conventional technology]

As shown in FIG. 5, the conventional 7-accumulator control system @1 is composed of an accumulator section 2 and a control section 4 that controls a drive motor 3 of the accumulator section 2. As shown in FIG.

The accumulator section 2 continuously conveys the material 6 in the direction of the arrow by the inlet roll 5. Then, a predetermined amount of the material 6 is stored by winding it in a hairpin shape around the fixed rolls 7a, yb, 7C, rd of the fixed roll group 7 and the lifting rolls 8a, 8b, 8c of the lifting roll group 8. conveyed to the next process.

The control unit 4 controls the inlet roll speed S1 (hereinafter S1
) and the exit roll speed 32 (hereinafter referred to as S2), calculate the speed difference between them, and adjust the speed at which the lifting roll group 8 is raised and lowered while maintaining a constant tension state according to the speed difference. do. Then, at the calculated speed, the lifting roll group 8
Instructs how much torque should be applied to the drive motor 3 in order to operate the motor. Thereby, the accumulator section 2 operates the drive motor 3 of the lifting roll group 8 with the torque instructed by the control section 4 to absorb the above-mentioned speed difference.

That is, when 51=32, the lifting roll group 8 is fixed by the brake 10. However, when S1 and S2 occur, the brake 10 of the lifting roll group 8 is released, and the drive motor 3 performs the lifting operation.

(Problems to be Solved by the Invention) In the conventional apparatus, as described above, when the brake is released, the tension on the material fluctuates due to the weight of the mechanical system of the lifting roll group. As a result, quality was affected, especially in the case of coating materials, paper, films, and other materials that tend to stretch easily.

SUMMARY OF THE INVENTION An object of the present invention is to provide an accumulator control device that can suppress fluctuations in tension on a material when the brake is released with a simple configuration.

[Means for solving problems]

The cause of the tension fluctuation when the brake is released is that the weight of the mechanical system of the lifting roll group is transiently applied to the material when the brake is released.

Therefore, in the present invention, a bias correction means and a control unit of the accumulator control device are provided in advance to give the drive motor a torque that offsets the tension temporarily applied to the material by the weight of the mechanical system of the lifting roll group when the brake is released. It is characterized by

[Effect]

The operation of the present invention is as follows. That is, before the brake is released, torque is applied to the drive motor to offset the weight of the mechanical system of the lifting roll group. Therefore, after the drive motor supplies the countervailing torque to the lifting roll group, the brake is released.

Furthermore, even before the brake is activated, torque is applied to the drive motor to offset the weight of the mechanical system of the lifting roll group, the lifting roll group is temporarily fixed, and then the brake is activated. After the brake is applied, the power to the drive motor is cut off.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an accumulator control device 1 includes an accumulator section 2 and a control section 4 that controls a drive motor 3. As shown in FIG.

This accumulator section 2 continuously conveys material 6 in the direction of the arrow by means of an inlet roll 5. Then, the material 6 is wound in a hairpin shape around fixed rolls 7a, 7b, 7c, and 7d of the fixed roll group 7 and lifting rolls 8a, 8b, and 8C of the lifting roll group 8, and stored in a predetermined amount. conveyed to the next process.

The lifting and lowering operations and fixing of the lifting roll group 8 are performed by the drive motor 3 and the brake 10.

This drive motor 3 is controlled by a control section 4.

This control section 4 includes an entrance roll speed detector 11, an exit roll speed detector 12, a speed calculation circuit 13, and a tension setting device 14.
, tension detector 15, tension control circuit 16, speed control circuit 1
7, a current control circuit 18, a power conversion device 19, a base weight setter 21 as a bias correction means 20, and a torque calculation correction circuit 22.

First, the entrance roll speed S1 of the material 6 is detected by the entrance roll speed detector 11. Further, the exit roll speed S2 is detected by the exit roll speed detector 12. And S
l and Sl are input to the speed calculation circuit 13, which calculates and outputs the lifting speed VR (hereinafter referred to as VR) of the lifting roll group 8 based on the following equation.

VR=(32-31)/2・n However, n is the number of lifting rolls.

Tension reference TR of material 6 set by tension setting device 14
(hereinafter referred to as TR) and the actual tension Tp (hereinafter referred to as Tp) of the material 6 detected by the tension detector 15 are input to the tension control circuit 16, and this tension control circuit 16 uses this value as a speed correction value. Calculate the correction Vc (hereinafter referred to as Vc). Add this speed correction Vc to the VR obtained by the above formula.

This added value is input to the speed control circuit 17, and the speed control circuit 17 outputs a torque reference IR (hereinafter referred to as IR).

The base weight T which is the weight of the mechanical system of the lifting roll group set by the base weight setting device 21! 3 (hereinafter T
B) and TR are input to the torque calculation correction circuit 22,
This torque calculation correction circuit 22 outputs a value converted to the torque of the drive motor 3 (hereinafter referred to as 1c). This torque conversion value Ic is obtained from the following equation.

I c =K (nxTa Ta) However, K is a coefficient for converting tension into motor torque, and n is the number of lifting rolls.

Ic is added to IR and the value is input to the current control circuit 18.

This current control circuit 18 outputs a phase symbol, and the phase signal is input to a power conversion device 19. The power output from the power conversion device 19 is supplied to the drive motor 3, and the drive motor 3 thereby operates the lifting roll group 8.

FIG. 2 is a detailed diagram of the torque calculation correction circuit 22.

The torque calculation correction circuit 22 includes an addition circuit 25 and a polarity inversion circuit 26 that inverts the output of the addition circuit 25.

Tension reference TR and base weight set value T8 are compared at addition point S, and the difference is amplified by amplifier 27. Then, the polarity of the output of the adding circuit 25 is reversed by a polarity reversing circuit 26, and becomes the aforementioned torque conversion value Ic.

FIG. 3 is a timing chart of the brake and drive motor.

When actuating the brake, torque is applied to the drive motor 3 in advance to fix it, and then the brake 10 is actuated to fix the lifting roll group 8. And brake 10
After the lifting roll group 8 is fixed, the power to the drive motor 3 is cut off.

Conversely, when the drive motor 3 operates the lifting roll group 8, torque is applied to the drive motor 3 and the lifting roll group 8 is fixed by the drive motor 3, and then the brake 10
release.

FIG. 4 is a diagram showing the relation between the entrance roll speed S1 and the exit roll speed S2, the speed difference therebetween, and the position of the lifting roll group 8 due to the speed difference.

In this case, Sl transports the material 6 at a constant speed ■81, and S
Indicates when l changes. Further, it is assumed that each time period is equal.

The exit roll speed S2 gradually decreases from time tA, and the exit roll 9 is stopped between time tB and time tc. At this time, the material 6 is being conveyed at a constant input roll speed S1. Therefore, at time tA, the lifting roll group 8 of the accumulator section 2 begins to descend, and the material 6 is stored.

Thereafter, at time jc, the output roll 9 starts conveying the material 6. However, since the entrance roll speed S1 is higher than the exit roll speed S2, the elevating roll group 8 continues to descend.

At time tD, the elevating roll group 8 reaches the lowest point because the exit roll speed S2 becomes equal to the entry roll speed S1.

Between time to and time tE, the exit roll speed S2 accelerates and becomes higher than the entry roll speed S1. Therefore, the elevating roll group 8 also begins to rise.

At time tE, the exit roll speed S2 reaches twice the entrance roll speed S1. Therefore, the lifting roll group 8 continues to rise at a steeper slope than before.

Between time tE and time tF, the exit roll speed S2 maintains the speed at time tE. Meanwhile, the lifting roll group 8
continues to rise.

At time tp, the exit roll 9 begins to decelerate.

Between time tF and time ja, the exit roll speed S2 continues to be decelerated. However, since the speed is higher than the entrance roll speed S1, the elevating roll group 8 continues to rise.

Then, at time tQ, the entrance roll speed S1 and the exit roll speed S2 become equal.

Therefore, the storage amount of the accumulator section 2 that increased between time tA and time to is equal to the consumption amount of the accumulator section 2 that decreased between time tD and time tQ.

Therefore, the positions of the lifting roll group 8 at time tA and time ia are equal. Also, the tension is always constant.

〔Effect of the invention〕

As described above, according to the present invention, since a torque calculation correction circuit is provided that calculates in advance the tension applied to the material when the brake is released, the tension applied to the material (e.g., coating material, film, paper) changes when the brake is released. can be suppressed.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an embodiment of an accumulator control I device according to the present invention, Fig. 2 is a detailed circuit diagram of a torque calculation correction circuit applied to Fig. 1, and Fig. 3 is a diagram of a brake and drive motor. Timing chart, FIG. 4 is a relation diagram of the entrance roll speed S1 and the exit roll speed S2, the speed difference therebetween, and the position of the lifting roll group due to the speed difference, FIG.
The figure is a block diagram of a conventional 7-cumulator control device. 1... Accumulator control device 2... Accumulator section 3... Drive motor 4...
...Control unit 6...Material 8...Elevating roll group 10...Brake - Fig. 1 η Fig. 2 One-shot solution jLβ8
7b-Key 1 Spindle Figure 3 Figure 4

Claims (1)

[Claims] When a difference occurs between the inlet roll speed and the outlet roll speed of the accumulator section that stores a predetermined amount of material, the brake of the drive motor that operates the lifting roll group of the accumulator section is released, and the brake is adjusted according to the difference. In the accumulator control device, the accumulator control device includes a control unit that controls the drive motor by applying a torque to the drive motor in advance to offset the tension transiently applied to the material due to the weight of the mechanical system of the lifting roll group when the brake is released. An accumulator control device, characterized in that the control section is provided with bias correction means for applying bias.