JPH0347614A - Position control device for side guide - Google Patents

Abstract

PURPOSE:To perform the drive of an alternating current motor within a safety range by escaping a side guide or stopping its displacement when the internal temperature of the alternating current motor which is the driving source for the side guide is over the specified value. CONSTITUTION:When loading time rate is over the prescription, a monitoring part 10 for temperature increase is operated so as to send out signals to a driving circuit 11 for the alternating current motor to escape vertical rolls 2 to a position where the rolls are not brought into contact with a steel sheet 1 or stop the drive of the alternating current motor 12. Based on that control signals, the driving circuit 11 for the alternating current motor operates the alternating current motor 12 so as to drive a side guide device 3 according to operated results of a comparison operation part 7 under the condition that loading time rate is below the prescription and when loading time rate is over the prediscription, so as to bring the side guide device 3 into escape or so as to stop the alternating current motor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a side guide position control device that optimally maintains the distance between the side guide and the side edge of the steel plate to restrict lateral movement during conveyance of the steel plate. It is something.

[Prior Art] In a payoff reel for a rolling mill, the center of the coiled steel sheet to be rewound is aligned with the center of the line of the rolling mill, and the coil is inserted into the payoff reel. However, most coils have uneven coil edges (misalignment).

Therefore, when unwinding the payoff reel and winding up the tensicon reel, a means is required to restrict the movement of the steel plate in the width direction due to the irregular edges of the coil. As this regulating means, for example, side guides using vertical rolls are arranged on both sides of the steel plate passage, and these rolls are expanded or contracted according to the width of the plate to achieve the purpose.

However, the width of a steel plate is not constant after rolling, and the width fluctuates. Therefore, when the set width of the side guide is constant, the following situation occurs.

(1) Side guide width > Steel plate width There is a gap between the guide and the steel plate, and because of this gap, the center position is not constant.

(2) Side guide width (steel plate width) Since there is no gap between the guide and the steel plate, the steel plate cannot pass through, or the end of the steel plate may break.

(3) Side guide width = steel plate width Steel plates can be passed through stably.

From the above, in order for the steel plate to pass through the side guide stably, it is necessary to always satisfy the condition (side guide width = steel plate width).

7 and 8 are a plan view and a front sectional view showing a conventional side guide position control device.

Vertical rolls 2 serving as side guides are installed at predetermined intervals on both sides of the passage area of the steel plate 1. This vertical roll 2 has a side guide device 3 that can approach or separate the opposing sides.
is set to . This roll movement is driven by a DC motor 4. Further, the drive shaft of the side guide device 3 is provided with a side guide width detection device 5 that detects the side guide width.

Also, on the top of steel plate-1, there is a steel plate l passing directly below it.
A board width detection device 6 is installed to detect the board width. A comparison calculation section 7 is provided which compares the detection signal of the plate width detection device 6 and the detection signal of the side guide width detection device 5 and performs a predetermined calculation. Furthermore, this comparison calculation section 7
is provided with a power supply circuit 8 that drives the DC motor 4 based on the calculation result.

Next, the operation of the position control device having the above configuration will be explained.

The plate width detection device 6 detects the plate width of the steel plate l, while the side guide width detection device 5 detects the side guide width. The comparison calculation unit 7 executes calculation according to the following equation based on the two detection signals, and outputs the result in the form of a voltage (for example, DC-10V to +1OV).

(Plate Width - Side Guide Width)/Reference Width (,,) Based on this output signal, the power supply circuit 8 drives the DC motor 4 to rotate, and this rotation opens and closes the side guide device 3, thereby changing the spacing between the rows. Move it to the optimal position. As a result, the steel plate 1 and the vertical roll 2 are maintained in the state described in (3) above, and the steel plate 1 is stably set at the center position.

Regarding this type of device, for example, Japanese Patent Application Laid-Open No. 59-179219 and Japanese Utility Model Application No. 59-20909.

Utility Model Application No. 59-62805, Utility Model Application No. 59-14351, Utility Model Application No. 59-15162, Utility Model Application No. 61-63312
No., JP-A No. 61-39130 and Publication No. 60-784
There are No. 4 and so on.

[Problems to be Solved by the Invention] However, the conventional side guide position control device described above uses a DC motor as a drive source for the side guide device, which has the disadvantages of poor versatility and high equipment cost. There is.

In order to eliminate this inconvenience, it is desirable to use an AC motor as the drive source, but until now, automatic follow-up control technology to replace the servo control for DC motors has not been established, so it has not been possible to use it. .

SUMMARY OF THE INVENTION An object of the present invention has been made to solve such problems, and it is an object of the present invention to provide a side guide position control device that can perform positioning drive of a side guide without using a DC motor.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for detecting the difference between the plate width detection value and the side guide width detection value on both sides of a predetermined position along the conveyance path of the steel plate. In a side guide position control device that moves a side guide disposed in a retracting direction or an approach direction, when the internal temperature of an AC motor that is a drive source for the side guide is equal to or higher than a specified value based on the deviation value. Retract the side guide or
Alternatively, it is configured to include a control means for stopping the movement.

The control means includes a direction determination means for detecting a positive direction signal and a negative direction signal of the deviation value, and a calculation means for determining the evacuation or movement stop based on the frequency with which signals in each direction occur within a certain period of time. It can be configured with

[Function] By configuring as described above, when driving an AC motor that frequently repeats forward and reverse rotation, information corresponding to the internal temperature, which is a guideline for the usage limit of the AC motor, can be acquired and the To stop driving an AC motor when information exceeds a predetermined state, or to control an evacuation operation without adversely affecting a side guide. This makes it possible to drive the AC motor, which is susceptible to excessive forward and reverse rotation, within a safe range, making it possible to realize a side guide device using the AC motor.

As a means of acquiring information corresponding to the internal temperature mentioned above, the positive direction signal and negative direction signal of the deviation value between the board width detection value and the side guide width detection value are determined, and the frequency with which the signals in each direction occur within a certain period of time. It is possible to obtain based on
Necessary information can be obtained without directly detecting temperature.

[Embodiment] FIG. 1 is a block diagram showing the main structure of an embodiment of the present invention. In FIG. 1, the same reference numerals are used for the same parts as shown in FIG. 7, and redundant explanation will be omitted below.

As shown in FIG. 1, in this embodiment, an AC motor 12 is used in place of the DC motor 4, and a temperature rise monitoring unit is used in place of the power supply circuit 8 to monitor the temperature rise caused by starting/stopping the AC motor 12. 10 and the AC motor drive circuit 11 that drives the AC motor 9a12 based on the output signal of the temperature rise monitoring unit IO.

The electric motor used to drive the side guide is frequently driven intermittently in accordance with the width of the steel plate 1, as shown in FIG. However, in the case of a load that is driven intermittently in short cycles over a fixed period of time, the AC motor is constrained by the load time rate. Therefore, special consideration is required when driving the AC motor 12.

For this purpose, the present invention provides a temperature rise monitoring section IO. The temperature rise monitoring unit 10 calculates the ratio of drive time in a certain period of time (for example, 10 minutes) as follows, generates a drive signal according to the ratio, and outputs a drive signal to the AC motor drive circuit 1.
Send to 1.

Load time rate = (t/T) xloo (%)...
...(1) (Tatashi, t=Σt,, i=1 to 4.T is monitoring time) If the energization rate per fixed time increases, the AC motor 12
The temperature tends to rise rapidly, and in the worst case, it will cause burnout. Therefore, when the load time rate exceeds the specified value, the temperature rise monitoring unit 1O moves the vertical roll 2 to the steel sheet lO.
or move the AC motor 1 to a position where it does not come into contact with the motor.
2. A signal to stop the drive is sent to the AC motor drive circuit 11.
It operates to send to. Based on the control signal output from the temperature rise monitoring section 1O, the AC motor drive circuit 11 controls the AC motor 12 to be installed in the side guide according to the calculation result of the comparison calculation section 7 under the condition that the load time rate is below the specified value. M3 is driven, and when the load time rate is above the specified value, the side guide device r13 is driven to retreat, or the AC motor 12 is stopped, as described above.

In the above, the rating of the motor is expressed by the load time rate, but the rating limit can also be expressed by the rate of temperature rise. In short, any protection means may be used as long as the usage limit of the AC motor 12 can be grasped.

FIG. 3 is a block diagram showing the detailed configuration of the temperature rise monitoring section 10. As shown in FIG.

Reference numeral 21 denotes a dead hunt processing section, which removes minute signals from the output signals of the comparison calculation section 7 and outputs only signals above a certain level. The dead band processing section 21 is connected to an evacuation direction calculation section 22 and a counter evacuation direction calculation section 23 . The retracting direction calculation unit 22 corresponds to the case where there are two operating directions, forward and reverse, and is provided in consideration of the case where the retracting direction exists due to mechanical constraints or the like.

In this embodiment, the direction of the "open" side guide is the calculation target of the retraction direction calculation section 22. In this operation in the "open" direction, a side guide is installed to avoid collision between the steel plate l and the vertical roll 2. ! t3 needs to operate quickly. Further, the one-retraction direction calculation unit 23 executes calculations in the opposite direction (closing direction).

Operation control contacts 24a and 24b are inserted into each output line of the evacuation direction calculation section 22 and the anti-evacuation direction calculation section 23, and are turned on/off by the output of a temperature rise determination section 26, which will be described later. A temperature rise determination output section 25 is connected to the common connection output side of the operation control contacts 24a and 24b.

The temperature rise determination output section 25 amplifies the output signal of the retraction direction calculation section 22 or the anti-retraction direction calculation section 23, and outputs a signal for controlling the AC motor drive circuit 11. The temperature rise determination output section 25 also includes a temperature rise determination section 26.
is connected, calculates the load time rate based on the judgment output,
Based on the calculation result, either the output of the retraction direction calculation section 22 or the output of the anti-retraction direction calculation section 23 is selected.

FIG. 4 is a block diagram showing details of the temperature rise determination section 26.

Reference numeral 31 denotes an operation monitoring calculation unit that determines the operating status of the electric motor based on the output of the temperature rise determination output unit 25 from normal/reverse direction, and generates an operation limit output signal.

A temperature rise calculation unit 32 using a first-order delay circuit is connected to the operation monitoring calculation unit 31, and calculates a temperature rise over time T (10 minutes). A restriction start calculation unit 33 and a restriction release calculation unit 34 are connected in parallel to the temperature rise calculation unit 32 .

If the temperature rise according to equation (1) is a specified value (for example, 30%), the limit start calculation unit 33 sends a limit start signal to the output unit 35 when this value is exceeded. Also, when the load time rate decreases from over 30% and reaches a specified value (for example, 25%), a limit release signal is sent to the output section 3.
Send on 6.

Next, the operation of the temperature rise monitoring section 10 having the configuration shown in FIG. 3 will be explained with reference to the operational waveform diagram shown in FIG. 5.

A signal having a waveform as shown in (a) is outputted from the comparison calculation section 7, and the minute level of this signal is cut off as shown in (b) in the dead band processing section 21 of the temperature rise monitoring section 10. Among these signals, a signal synchronized in the positive direction is generated by the retreat direction calculation section 22 as shown in (c), and a signal synchronized in the negative direction (reverse direction) is generated by the counter withdrawal direction calculation section 23 as shown in (d). is generated like this. The temperature rise determination output section 25 includes an evacuation direction calculation section 22 and a counter-evacuation direction calculation section 23.
Based on the output signal of
Generates forward/reverse rotation signals.

Based on the output signal of the temperature rise determination output section 25, the temperature rise determination section 26 outputs a signal like (to) corresponding to the positive/negative peak interval with respect to the output of the comparison calculation section 7, and 24b.

The output signal of the temperature rise determination output section 25 is applied to the operation monitoring calculation section 31 shown in FIG. 4, which generates a signal as shown in FIG. 5 (G) in which all positive and negative input signals are converted into positive signals. do. In response to this pulse train signal, the temperature rise calculation unit 32 generates a signal as shown in (h) by integrating the input signal, and the limit start calculation unit 33 determines that the level has exceeded a preset value. Further, the restriction release calculation unit 34 determines that the amount has decreased, and outputs a restriction start signal or a restriction release signal.

FIG. 6 is a flowchart showing the operation of the temperature rise monitoring section 10 shown in FIG. 1 in terms of software. In addition, in the figure, S means a step.

First, it is determined whether the input signal is within the dead band (S61). If the input signal is within the dead band, it means that the interval between the vertical rolls 2 and the width of the steel plate 1 are appropriate, and the side guide device Since there is no need to operate the AC motor drive circuit 3, the signal for driving the AC motor drive circuit 11 is not outputted.On the other hand, if it is outside the dead band, it is determined whether the vertical roll 2 is in the direction in which it should be evacuated. (S63), if the steel plate 1 is in the retreating direction, there is no risk of collision between the steel plate 1 and the vertical roll 2, so it is operated without any conditions (S64), and if the steel plate 1 is in the approaching direction, it is checked whether temperature rise management is OK. If it is determined that the temperature rise is being controlled, continue the control for driving the AC motor 12 (S67); otherwise, the AC motor 12
(S68).

Above, the invention made by the present inventor has been specifically explained based on Examples, but it goes without saying that the present invention is not limited to the Examples and can be modified in various ways without departing from the gist thereof. stomach.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

According to the side guide position control device according to claim (1), the side guides are arranged on both sides of a predetermined position along the conveyance path of the steel plate based on the deviation value between the plate width detection value and the side guide width detection value. In a side guide position control device that moves a side guide in a retracting direction or an approach direction, when the internal temperature of an AC motor that is a drive source of the side guide is equal to or higher than a specified value based on the deviation value, the side guide is moved in a retracting direction or an approach direction. Since a control means is provided to evacuate or stop the movement of the AC motor, it is possible to drive the AC motor, which is susceptible to excessive forward and reverse rotation, within a safe range. It becomes possible.

Further, according to the side guide position control device according to claim (2), the control means includes direction determining means for detecting a positive direction signal and a negative direction signal of the deviation value, and the signals in each direction are fixed for a certain period of time. Since the configuration includes calculation means for determining the evacuation or movement stop based on the frequency of occurrence within the interior, information corresponding to the internal temperature can be obtained without directly detecting the temperature.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the main configuration of an embodiment of the present invention;
Figure 2 is an energization waveform diagram showing the usage status of the electric motor used to drive the side guide, Figure 3 is a block diagram showing the detailed configuration of the temperature rise monitoring section, and Figure 4 is the temperature rise determination shown in Figure 3. FIG. 5 is a block diagram showing the details of the temperature rise monitoring section shown in FIG.
This figure is a flowchart showing the operation of the temperature rise monitoring section shown in FIG. 1, and FIGS. 7 and 8 are a plan view and a front sectional view showing a conventional side guide position control device. In the figure. 1: Steel plate 2: Vertical roll 3: Side guide device 6: Plate width detection device 7: Comparison calculation section 10: Temperature rise monitoring section 1: AC motor drive circuit 12 2 AC motor 21: Dead band processing section 22: Retreat direction calculation Section 23: Anti-retreat direction calculation section 24a, 24b: Operation limit contact 25: Temperature rise judgment output section 26: Temperature rise judgment section Fig. 1, Fig. 2

Claims (2)

[Claims] (1) A side guide that moves the side guides placed on both sides of a predetermined position along the conveyance path of the steel plate in the withdrawal direction or approach direction based on the deviation value between the plate width detection value and the side guide width detection value. In the position control device, a control means is provided for retracting or stopping the movement of the side guide when an internal temperature of an AC motor serving as a drive source for the side guide is equal to or higher than a specified value based on the deviation value. A side guide position control device characterized by: (2) The control means includes a direction determination means for detecting a positive direction signal and a negative direction signal of the deviation value, and determines the evacuation or movement stop based on the frequency with which signals in each direction occur within a certain period of time. The side guide position control device according to claim 1, further comprising a calculation means.