JPH05111288A - Drive controller for paper making machine - Google Patents

Abstract

PURPOSE:To control a driver for post stage roll such that the paper slack between a coating section and post stage section is eliminated appropriately when coating operation is started by comparing an allowable load current value fed from a tension current memory circuit with an actual load current value and adding a set superposing speed to a set speed value to produce a speed reference s signal. CONSTITUTION:A drive motor 3 for a post stage coating roll 2 is driven by a driver 5 through a current controller 8 and a phase controller 7 with the speed of the drive motor 3 being controlled through a speed controller 9 based on a speed feedback signal fed from a rotational speed detector 4 and according to the reference of a speed setter 10. A coating start signal 20 is fed to an AND unit 14 in order to actuate a comparator 13 which then compares an output current IO from a tension current memory circuit, corresponding to the brand, paper width, mechanical loss and acceleration rate with a value ID detected through a current detector 6 for the driver 5. If IO>ID, a value set in a superposing speed setter 11 is added to a reference signal and the addition is interrupted when IO= ID.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive controller for a paper machine having a coating section.

[0002]

2. Description of the Related Art In a paper machine having a coating section, when the coating is started, the paper is stretched due to the coating agent being contained in the paper. In this case, the speed of the latter section is set so as to move faster to the operating speed after coating. However, at the moment of the coating operation, paper slack due to paper stretching transiently occurs between the coating section and the subsequent section. In the prior art, in order to remove this slack, exercise was performed by adding speed for a certain period of time depending on the brand, but since this additional speed was set in time, if the time is short, slack in the paper should be sufficient. If the paper could not be taken and the time was long, there was a problem that the paper was too tight or the paper was cut.

[0003]

As described above, in the prior art, there are problems such as slack of paper, excessive tension of paper and paper break between the coating section and the latter section.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drive control device for a paper machine, in order to solve the above-mentioned problems of the prior art, in order to properly eliminate the slack between the coating section and the subsequent section that occurs at the start of coating. Especially.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a drive motor for driving a post-coating section section of a paper machine having a coating section, a rotation speed detector for detecting the rotation speed of the drive motor, and a drive motor. The current detector that detects the actual load current value flowing in the drive device that controls the speed, the speed setter that gives the speed set value by the coating start signal, and the coating section immediately after the start of coating and the latter stage of the coating section. An additional speed setting device that adds a set value to remove the slack that occurs between them, a tension current memory circuit that converts a preset brand, paper width, mechanical loss, and allowable tension value into an allowable load current value, and this tension current Comparing the allowable load current value from the memory circuit with the actual load current value, a comparator that outputs a logic establishment signal when the coating start signal is input and the output does not become the logic establishment, and the coating start signal When both the outputs of the comparator are established, the logical product unit that adds the set value of the additional speed setter to the speed set value as the speed reference signal, and the speed reference signal is limited by the rotation speed and the actual load current value. In addition, it is a drive control device for a paper machine including a phase controller that controls the thyristor phase of the drive device.

[0006]

In the drive control device for the paper machine according to the present invention, the rotational speed of the drive motor for driving the latter section of the coating section of the paper machine having the coating section is detected and the speed is controlled by the drive motor. The actual load current value is detected, the speed setting value is given by the coating start signal, and the setting value is added in advance in order to remove the slack that occurs between the coating section and the subsequent stage of the coating section immediately after the coating is started. Compare the allowable load current value from the tension current memory circuit that converts the set brand, paper width, mechanical loss and allowable tension value to the allowable load current value and the actual load current value, and the coating start signal is input. And when the output does not become logic non-establishment, the logic establishment signal is output, and when the coating start signal and the output of the comparator are both established, the set value of the add-on speed setter is added to the speed set value to set the speed reference. Signal and fast Controlling the thyristor phase of the drive unit to the reference signal speed and places restrictions by actual load current value.

[0007]

EXAMPLE An example of the present invention will be described below. Figure 1
A drive motor 3 that drives the latter section of the coating section of a paper machine having a coating section, a rotation speed detector 4 that detects the rotation speed of the drive motor 3, and a drive device 5 that controls the speed of the drive motor 3. A current detector 6 for detecting a load current value,
The set value is added in order to remove the slack generated between the speed setting device 10 which gives a speed setting value by the coating start signal 20 and the coating part immediately after the start of coating and the latter part of the coating part. An additional speed setting device 11, a tension current memory circuit 12 that converts a preset brand, paper width, mechanical loss, and allowable tension value into an allowable load current value, and a tension current memory circuit 12
The comparator 13 that outputs the logic establishment signal when the coating start signal 20 is input by comparing the allowable load current value with the actual load current value and the output does not become the logic establishment state, and the coating start signal 20. And the output of the comparator 13 are both satisfied, the ANDer 14 that adds the set value of the additional speed setter 11 to the speed set value as the speed reference signal, and the rotation speed and the actual load current as the speed reference signal. 1 shows a drive control device for a paper machine, which comprises a phase controller 7 for controlling the thyristor phase of the drive device 5 by limiting the value.

That is, in a drive for a paper machine having a coating section rear stage selection of a paper machine having a coating section, a drive motor 3 for driving the coating section rear stage section, and a rotational speed detection for detecting the speed of the drive motor 3 The power source of the drive unit 4 and the drive motor 3 is converted, the speed detection signal of the rotation speed detector 4 is fed back in accordance with the speed reference, and the drive device 5 that drives the speed control and the current that detects the actual current of the drive device 5 are fed. The detector 6, the speed setting device 10 that gives an appropriate speed setting to the drive device by the coating start signal 20, and to remove the slack generated between the coating part and the subsequent stage of the coating part immediately after the start of coating. The additional speed setting device 11 for setting the additional speed, the brand, the paper width, the mechanical loss,
Set the acceleration rate and compare the output of the tension current memory circuit 12 that converts the allowable tension value given in advance to the allowable current with the actual current of the actual current detection circuit and the output of the tension current memory circuit 12 to start coating. When the signal 20 is input and the output of the comparator 13 that outputs the logic establishment signal and the outputs of the coating start signal 20 and the comparator 13 are both established when the output of itself does not become the logic not established A drive control device for a paper machine, which comprises a logical product unit 14 for adding the set value of the additional speed setting unit 11 to the speed reference signal value.

The speed setting value of the subsequent section is automatically increased for each brand by the coating start signal 20, but this acceleration cannot be performed instantaneously, so the paper is stretched due to the paper elongation and the subsequent section. Talumi occurs between sections.
The current I of the drive motor of the latter section is I = I _L + I _ACC + I _T (1) where I _L is the current value required for mechanical loss drive, I
_ACC is a current value required for acceleration, and I _T is a tension component current value. When slackness occurs, a tension component current value I _T =
It becomes 0. The current value I _L and the current value I _ACC are uniquely obtained from the load and GD ^{2 of the} load. Further, the tension component current value I _T is proportional to the tension value. Now, assuming that an appropriate tension value of a certain brand is T ₀ , the current value I _T0 corresponding to the tension is I _T = A · T ₀ · W (2) And A is a proportional constant and W is a paper width. It is decided for each issue. Therefore, I ₀ = I _L + I _ACC + I _T0 is determined for each brand.

The current I _{D of the} driving device is detected and compared with this current I _{0. When} I _D = I ₀ (3), the tension between the sections is proper. So the slack has been removed. Therefore, in order to remove the slack, the added speed is cut off and the vehicle is operated at the set speed.

Then, as described in the above section,
The current I _{D and the} current I ₀ are compared, and the addition of the addition speed for removing the slack after the coating start signal is input is stopped, so that the paper is properly pulled without pulling the paper with a tension higher than the required tension. Acts like.

That is, the paper that has passed through the coating roll 1 passes through the rear section roll 2, and the rear section roll 2 is driven by the drive motor 3 with the rotation detector 4, and the drive motor 3 moves at a speed. According to the reference of the setting device 10, the speed is controlled by the speed controller 9 by the speed feedback signal of the rotation detector 4 and driven by the driving device 5. Coating start signal 2
0 is the output current of the tension current memory circuit 12 that increases the speed setting device 10 and starts the operation of the comparator 13, inputs the brand, paper width, mechanical loss, and acceleration rate, and outputs the current value according to each brand. I ₀ is compared with the detection value I _D of the current detector 6 that detects the current of the driving device 5 by the comparator 13, and if I ₀ > _ID (4), the logic establishes the speed reference signal, When the coating start signal is established, it is added to the reference signal of the additional speed setting device 11 and is constituted by the logical product device 14 which stops the addition when I ₀ = _ID (3) It

Then, the output of the comparator 13 is used to judge the period during which the additional speed is applied, and as shown in FIG. (Corresponding to the area of B) is taken by the acceleration due to the additional speed (corresponding to the area of B), so that the slack is eliminated and the control action is performed without excessive tension.
In addition, 21 is addition speed, 22 is coating start, 23 is tension I
₀ = _ID , 24 is the coating speed, and 25 is the latter stage section speed.

[0014]

According to the present invention, when looseness occurs,
The slack can be removed without breaking the paper without applying a tension higher than the allowable tension of the paper, and even if the elongation of the paper changes due to the coating agent, the slack can be automatically removed. The effect is that there is no paper.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a drive control device showing an embodiment of the present invention.

FIG. 2 is a speed chart explanatory diagram showing elimination of slack during coating.

[Explanation of symbols]

 3 ... Driving motor 4 ... Rotational speed detector 6 ... Current detector 7 ... Phase controller 10 ... Speed setting device 11 ... Addition speed setting device 12 ... Tension current memory circuit 13 ... Comparator 14 ... Logical product device

Claims (1)

[Claims] 1. A drive motor for driving a rear section of a coating section of a paper machine having a coating section, a rotation speed detector for detecting a rotation speed of the drive motor, and a drive device for controlling the speed of the drive motor. A current detector that detects the actual load current value that flows, a speed setter that gives a speed set value by a coating start signal, and a slack that occurs between the coating unit and the subsequent stage of the coating unit immediately after the start of coating. An additional speed setting device that adds a set value to take, a tension current memory circuit that converts a preset brand, paper width, mechanical loss and allowable tension value into an allowable load current value, and the allowable current from this tension current memory circuit. Comparing the load current value and the actual load current value,
When the coating start signal is input and the output does not become a logic non-establishment, a comparator that outputs a logic establishment signal, and the addition when the coating start signal and the output of the comparator are both established A logical product unit that adds a set value of the speed setter to the speed set value as a speed reference signal, and a thyristor phase of the drive unit by adding a limit to the speed reference signal by the rotation speed and the actual load current value. A drive control device for a paper machine, which comprises a phase controller for controlling.