JPH0152126B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a position control device for side trimming of a strip.

Conventional technology and problems In general, in the pickling process, which is a pretreatment for the cold rolling process, a side trimmer is used to cut the edge of the strip in order to obtain a strip with better width accuracy than that of the hot-rolled original sheet. During the process, the strip often drifts sideways due to the camber of the hot-rolled sheet, or the strip shifts to one side due to variations in the width of the hot-rolled sheet, and the strip edge cannot be cut as planned ( (hereinafter referred to as trim defect)
is occurring. In order to prevent this trimming failure, the strip center at the trimmer section is made to match the trimmer center by shifting the side guides to the left and right to prevent horizontal flow, and to prevent width fluctuations. This is handled by controlling the position of the strip by opening and closing (resetting) the side guides so that both edges of the strip are firmly gripped.

However, in conventional side guide shift devices and side guide set devices, automatic positioning control of the side guide shift hydraulic cylinder and side guide set motor is not performed, or the response of the control device is extremely poor. It is not showing good performance. In addition, since the steel plate side edge detector of conventional side guide setting devices is installed on the side guide entry side, a phenomenon occurs in which the side guide crushes the strip edge (hereinafter referred to as edge folding) when the strip width transitions to a narrow width. was.

OBJECTS OF THE INVENTION The present invention aims to improve the above-mentioned problems, and to properly control the strip position by appropriately shifting the side guide to the left and right and opening/closing the side guide, thereby performing desired side trimming.

Structure of the Invention The strip position control device for side trimming of the present invention includes a side guide shift device that includes a strip side edge detector attached to the trimmer body, a hydraulic cylinder that moves the side guide bed from side to side, and an operational amplifier to which a strip position signal is input; a positioning circuit to which the output of the amplifier and the output of the bed position detector are input through a lead compensation circuit; and a hydraulic device for driving the hydraulic cylinder with the output of the circuit. By feeding back the position signal of the hydraulic cylinder that has been prepared and compensated for advance, and adding a compensation circuit that advances to the main loop, the response is improved. A strip side edge detector attached to the side, a signal discrimination circuit for discriminating one of the detector outputs, an electric motor for opening and closing the side guide, and a position signal inputted from the strip side edge detector. a position detector for the side guide, and a positioning circuit that receives the strip width signal and the side guide position signal from these detectors through a lead compensation circuit;
and a speed control device that controls the electric motor in response to the output of the circuit, a compensation circuit similar to that described above is provided to improve responsiveness, and a steel plate side edge detector is provided on the entrance/exit side of the side guide. , Strip edge breakage due to opening and closing of the side guide giving priority to the signal detected by the detector signal with a wider strip width, especially edge breakage at the wide-to-narrow width change part of the strip weld. It is characterized by being designed to prevent this from occurring. Hereinafter, the present invention will be explained in detail with reference to the drawings.

Embodiment of the Invention FIG. 1 shows an embodiment of the strip position control device of the present invention. This figure shows an outline of the mechanism in a perspective view, and also shows a control electric circuit in a block diagram. 15 and 15' are trimmer bodies, and 16 is a strip to be trimmed. strip 1
Detectors 1 and 1' are attached to the trimmer body 15 and 15' in order to detect the left and right side edge positions of the trimmer 6, and output side detectors 8 and 1' are attached to the side guides 14 and 14'.
8' and entry side detectors 8'', 8 are attached.The side guides 14, 14' are attached to the bed 7 together with an electric motor 12 that drives them, and the bed 7 is attached to a fixed foundation 17 and is driven by a hydraulic cylinder 5. A position detector 6 is also attached to the fixed foundation 17 to detect the current position of the bed 7 moved by the hydraulic cylinder 5. A position detector 13 is also attached to the bed 7, and the electric motor Side guide 1 moved (opened and closed) by 12
4' is detected. Next, in the control electric circuit, 2 is an operational amplifier, 3 is a positioning circuit, and 4 is an operational amplifier.
is a hydraulic device that supplies pressure oil to the hydraulic cylinder 5. Also, 9 and 9' are operational amplifiers similar to 2, and 3
0 is a signal discrimination circuit, 10 is a positioning circuit, and 11 is a speed control device that controls the electric motor 12.

Next, to explain the operation, the trimmer body 15, 1
Side edge detectors 1, 1' attached to the strip 16 detect the current positions of the left and right edges of the strip 16, and the detection signals are input to the operational amplifier 2. The operational amplifier 2 is adjusted to have zero output when the strip 16 is in the desired position relative to the trimmer body 15, 15' (when the center line of the strip 16 coincides with the center line of the trimmer body 15, 15'). , when the strip 16 deviates to the left or right from the desired position, a positive or negative output is produced depending on the amount of deviation.
The output of the operational amplifier 2 becomes a feedback signal for a closed loop strip position control system consisting of a positioning circuit 3, a hydraulic device 4, a hydraulic cylinder 5, a bed 7, side guides 14, 14', and a strip 16.
Side guides 14, 1 so that the above deviation becomes zero.
4' adjust the strip position. Detector 6
negative feedback of the current bed position to the positioning circuit 3,
Prevent over-control.

The outputs of the side edge detectors 8, 8' and 8'', 8 are input to operational amplifiers 9, 9';
Signal discrimination circuit 3 that discriminates the larger output of 9'
0, side guides 14, 14' through a system of position detector 13, positioning circuit 10, speed control device 11, and electric motor 12, and detectors 8, 8' and 8'', 8
The strip 16 is opened (or closed) depending on the width of the strip 16 detected by the operator. The strip side edge detector has conventionally been provided on the entry side of the side guides 14, 14'. In the present invention, this is also provided on the entrance/exit side of the side guide as shown in the figure. If the side edge detectors 8, 8' are also provided on the exit side of the side guide, as shown in FIG.
When changing from the narrow material 16b, the side guide 1
4, 14' prevents the edges of the strip from folding.

That is, when the width of the strip passing through the side guide part changes from wide to narrow, the narrow width is detected at the entrance side of the conventional side guide and the strip is immediately changed to the side guide 1.
If you drive 4 and 14' towards the closing side, at this time the wide part is still on the side guide, so there is a risk that the strip edge will break due to the above drive.
When the signal discrimination circuit of the device of the present invention detects the wide width at the exit side of the side guide, in this state the wide part passes through the side guide, the side guide remains as it is, and the output side detector detects the narrow width. Since the side guide is driven in the closing direction immediately after detecting the edge, the strip edge will not be bent.

On the contrary, when the width of the strip passing through the side guide part changes from narrow to wide, when the wide part is detected by the strip side edge detector installed at the entrance side of the side guide, the output of the detector immediately changes the width of the strip from narrow to wide. This opens the guides 14, 14' to a value corresponding to the strip width. This opening is desired to be rapid, thus supplying the motor 12 with a high voltage (high current), but the above-mentioned closing may also be gradual, thus supplying the motor 12 with a low voltage (low current). supply

FIG. 2 shows a block diagram of the side guide shift device. 1 to 6 are blocks corresponding to those in FIG. 18 and 19 are lead compensation circuits, 20 is a transfer function of the strip when the strip is shifted using the side guide, and its output is the position of the strip 16. The loop passing through blocks 6 and 19 is a feedback compensation circuit. An example of a lead compensation circuit is shown in FIG. In the figure, 23a, 23b, and 23c are resistors, 24 is a capacitor, and 25 is an operational amplifier. Without this advance compensation circuit, the frequency characteristics of the side guide shift system would deteriorate and trim defects would likely occur.

FIG. 3 shows a block diagram of the side guide setting device. 8 to 14' and 30 are blocks corresponding to those in FIG. 21 and 22 are lead compensation circuits, and a loop passing through blocks 13 and 22 is a feedback compensation circuit. This advance compensation circuit has the same structure as that shown in FIG. Without this circuit, the frequency characteristics would be extremely poor, but with this circuit provided, the response would be improved.

Figure 5 is a diagram showing the characteristic values of the input (horizontal axis) and output (vertical axis) of the positioning circuit 10, and shows the deviation between the strip width and the side guide width (horizontal axis) and the opening/closing speed of the side guide (vertical axis). , and part a shows the dead zone when the deviation is small on the negative side.
or side opening direction indicates the same closing direction. This makes it possible to prevent the edges from folding.

Note that when the width of the strip 16 changes, the distance between the trimmer bodies 15, 15' also changes, but this moving mechanism is not shown. In addition, since the side guides 14 and 14' both move in FIG. 1, the amount of operation is twice the value detected by the detector 13. The outputs of the side edge detectors 8, 8' on the exit side of the side guide are used by discriminating the outputs of the detectors on the entrance side of the side guide when the strip width decreases, or when the width increases.

Effects of the Invention As described above, according to the present invention, the strip can be guided quickly and appropriately during side trimming, and even if the strip width changes, there is no bending of the edge of the strip edge due to the side guide.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIGS. 2 and 3 are block diagrams showing the configuration of the control system of the side guide shift section and side guide set section of FIG. 1, and FIG. 4 is a strip diagram. FIG. 5 is a diagram showing the relationship between the deviation between the strip width and the side guide width and the opening/closing speed of the side guide, and FIG. 6 is a detailed diagram of the advance compensation circuit. In the drawing, 15 and 15' are the trimmer body, 16 is the strip, 14 and 14' are the side guides, 1,
1' etc. are side edge detectors, 5 is a hydraulic cylinder, 2,
9 is an operational amplifier, 18, 21, etc. are lead compensation circuits,
6 is a bed position detector, 4 is a hydraulic system, 3 is a positioning circuit, 30 is a signal discrimination circuit, 12 is a side guide opening/closing motor, 10 is a positioning circuit, and 11 is a speed control device.

Claims (1)

[Scope of Claims] 1. A device for controlling the position of a strip side-trimmed by a trimmer using a side guide, comprising: a strip side edge detector attached to the trimmer body; a hydraulic cylinder that moves the side guide bed from side to side; an operational amplifier that receives a strip position signal from the bed position detector; a positioning circuit that receives the output of the amplifier and the output of the bed position detector through a lead compensation circuit; and a hydraulic device that drives the hydraulic cylinder with the output of the circuit. a side guide shift device for aligning the strip center line with the center line of the trimmer body; a strip side edge detector attached to the entrance/exit side of the side guide; and a side guide shift device for discriminating the output of either one of the detectors. A signal discrimination circuit, an electric motor for opening and closing the side guide, an operational amplifier to which the position signal from the strip side edge detector is input, a side guide position detector, and a strip signal from these detectors through a lead compensation circuit. A strip position control device comprising a side guide setting device comprising a positioning circuit receiving a width signal and a side guide position signal, and a speed control device receiving the output of the circuit and controlling the motor.