JPS60209459A - Material height control/correction device of continuous line in tank - Google Patents

Abstract

PURPOSE:To invariably keep the height of a material in a processing tank stable and constant by keeping the length of the input feed-in material and the output feed-out material constant. CONSTITUTION:The length of a material fed into a processing tank is detected by a length detector 21 directly connected to the shaft of a motor 4 driving an input roll 2, and the length of the material fed out of the processing tank is detected by a length detector 23 directly connected to the shaft of a motor 5 driving an output roll 3. The detected signals are inputted to a detected signal arithmetic unit 22, the variation signal of the material length per unit time fed into the processing tank is calculated, this variation signal is inputted into a variation arithmetic amplifier 24, and a speed correction signal 25 per unit time is outputted. This speed correction signal 25 is added to the speed reference signal 9 of a drive source 10 to change the speed of the output roll 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a material height direction control correction device in a tank of a continuous line that continuously processes steel plates, paper, plastics, films, etc.

[Technical Background of the Invention] As shown in FIG. 1, in a conventional continuous line of this kind, the inlet roll 2 located at the inlet side of the processing tank 1 and the outlet roll 3 located at the outlet side are both driven by independent electric motors. 4 and 5. In this configuration, the material 6 passes through the processing tank 1.
It is necessary to maintain a position of the material 6 suitable for the treatment, for example, a position where the material 6 is sufficiently immersed in the cleaning liquid for cleaning, and a position where a sufficient amount of heat is applied to the material when passing through the furnace.

For this purpose, a sensor 7 is provided to detect the material height, and a converter 8 is provided to calculate the deviation between the detected value of the sensor 7 and the target height.The output of the converter 8 is used as a speed correction signal to speed up the line speed. In addition to the reference 9, the drive m10 rotates the electric motor 15 to drive the exit roll 3, and on the other hand, a drive source (not shown) causes the electric motor 4 to rotate at a constant rate, and drives the entrance roll 2 to increase the material height. 11 was kept constant. Note that 12 is a rotational speed detector that detects the rotational speed of the electric motor 5, and 13 is a feedback signal from this rotational speed detector 12.

In recent years, it has become common to provide not one but a plurality of processing tanks 1 to process the material 6. In this case, the sensor is provided in one of the plurality of tanks, and one Based on the detection results of the material heights in the two tanks, determine the difference between the target height and the tank entrance side or (
Control is performed to keep the height of materials in multiple tanks constant by changing the speed (outlet side).

[Problems in the Background Art] However, in the conventional height direction control device described above, when a plurality of processing tanks are connected, the material position of the sensor-attached tank may interfere with the position of other materials. In order to
It takes time for all tanks to form a stable material position, and sensor characteristics are often non-linear with respect to height, and changes in material size (plate thickness, plate width) can cause The height of the material at the fulcrum is not constant, and in some cases the material hanging down to the bottom of the tank may be damaged, and the concentration of the processing liquid in the tank varies depending on the vertical position of the tank. That's why I don't like it. Furthermore, even if you try to keep the material height constant by changing the entry (output) speed based on the position signal detected by the sensor, the During this period, it is extremely unstable due to the shaking of the material.

In many cases, the material height cannot be kept constant due to control.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and is aimed at keeping the height of the material in the processing tank stable and constant at all times, regardless of line acceleration/deceleration, material size changes, target position changes, etc. The purpose of the present invention is to provide a height direction control correction device in a continuous line tank that can perform the following steps.

[Summary of the Invention] In order to achieve the above object, the present invention is configured so that the lengths of the inlet side feed material and the outlet side feed material of a continuous line processing tank are kept constant.

[Embodiments of the invention] The present invention will be explained below with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention, in which a length detector 21 is directly connected to the rotating shaft of an electric motor 4 that drives the input roll 2, and the length of the material fed into the processing tank 1 is thereby measured. Detect. The material length detected by the length detector 21 is input to the input side of the detection signal calculator 22. In addition, a length detector 23 is directly connected to the rotating shaft of the electric motor 5 that drives the outlet O-ru 3, and thereby the length of the material sent out from the processing tank 1 is detected. It is input to the input side of the detection signal calculator 22, and the time side signal 26 is input to the 'input side. Then, in the detection signal calculator 22, each material length per unit time is determined, and the deviation signal between these two material lengths is the timetable signal @
26 is input to the deviation operational amplifier 24 to obtain a speed correction signal 25 per unit time, and this speed correction signal 25 and the line speed reference 9 are added. This added value is added to the feedback signal 13 from the rotational speed detector 12, this added value is added to the drive aio, and this drive source 10
15 is driven.

The operation of the material height direction control correction device in the tank of the continuous line constructed as described above will be explained below.

In FIG. 2, the material 6 is fed into the processing tank 1 by the inlet roll 2, and is pulled out from the processing tank 1 by the outlet roll 3. Entry side roll 2
, the exit roll 3 is driven by an electric motor 4.5. In this case, the length of the material sent into the processing tank 1 is detected by a length detector 21 directly connected to the shaft of the electric motor 4 that drives the inlet roll 2, and the length of the material sent out from the processing tank 1 is detected by the length detector 21 directly connected to the shaft of the electric motor 4 that drives the inlet roll 2. The length is detected by a length detector 23 directly connected to the shaft of the electric motor 5 that drives the wheel 3.

The detection signals detected by the length detectors 21 and 23 are input to the detection signal generator 22, and the processing tank 1
A deviation signal between the length of material fed into the processing tank 1 per unit time and the length of material sent out from the processing tank 1 per unit time is detected, and this deviation signal is input to the deviation operational amplifier 24 to calculate the length of material per unit time. A speed correction signal 25 is output. This speed correction signal 25 is added to the speed reference signal 9 of the drive source 10 in order to change the speed of the exit roll 3.

(A) and (B) in FIG. 3 show the output signals of the length detectors 21 and 23, which are integrated signals at unit time points (A, B and C). C) is length detector 2
This shows the deviation composite signal of 1.23, which is input to the deviation operational amplifier 24. The length deviation unit time elimination signal shown in FIG. 3(D) is calculated so that the deviation output signal becomes zero, and the speed correction signal 25 shown in FIG. 3(E) is output. , the length-width difference unit time erasure signal means that the deviation signal detected within a unit time is emitted within the next unit time, and when the unit time point is reached, both electric motors 11!4.5 are equal. This is a signal that is calculated and outputted so as to achieve the speed.Therefore, this length deviation unit time elimination signal is given by adding the line reference signal 9 to the drive source 10 of the exit roll 3, and the output roll 3 The speed is as shown in Fig. 3(E).

In the embodiments described above, a configuration was described in which the inlet side feed amount was fixed and the outlet side feed amount was controlled. However, depending on the equipment, there is a configuration in which the outlet side feed amount is fixed and the inlet side feed amount is controlled. In addition, even if the inlet feed amount and the outlet feed amount are controlled by contradictory signals and there are a plurality of processing tanks 1, there will be no relation to line acceleration/deceleration, material size change, target position change, etc., as in the previous embodiment. Therefore, the height of the material in the processing tank 1 can be kept stable and constant at all times.

[Effects of the Invention] According to the present invention described above, in a continuous line having at least one processing tank, by keeping the lengths of the incoming material and the outgoing material constant, line acceleration/deceleration, material It is possible to provide a material height direction control correction device in a continuous line tank that can always keep the material height in a processing tank stable and constant regardless of size changes, target position changes, etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional material height direction control device in a tank of a continuous line. FIG. 3, a block diagram showing the embodiment, is an input/output waveform diagram of each part for explaining the operation of the embodiment. 1... Processing tank, 2... Tank entry side roll, 3...
・Tank outlet roll, 4.5... Electric motor, 6...
Material, 9... Line reference signal, 10... Drive source, 1
2... Rotation speed detector, 13... Feedback signal, 21° 23... Length detector, 22... Detection signal operator, 24... Deviation operational amplifier, 25... Speed Correction signal, 26...Time side signal. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] Materials such as paper, film, and steel strips are processed by immersing them in a processing solution with slack in a processing tank, and the inlet and outlet rolls are operated by independent drive devices in a continuous processing line. a length detector that detects the length of the material being fed into the processing tank on the inlet side and the length of the material being fed out the outlet side; and a detection signal calculator that inputs the detection signals of both length detectors and calculates a deviation signal between the two. and a deviation operational amplifier which calculates a speed correction signal by inputting the output of this detection signal calculation unit, and is characterized in that the speed correction signal of this deviation operational amplifier is applied to the drive device of the input side or exit side roll. A material height direction control correction device in a continuous line tank.