KR20050010361A - apparatus for reforming shape of hot strip on a run-out table - Google Patents

Abstract

PURPOSE: To provide an apparatus for correcting upward bent top end of strip on run-out table to improve direct transfer ratio and operation productivity of cold rolling supply material by preventing strip overlapping due to bending of the top end of the strip and preventing coiling mis-operation due to entry obstruction of the strip into a down coiler, thereby skipping rewinding operation. CONSTITUTION: The apparatus for correcting upward bent top end of strip on a run-out table comprises a shape detection part(100) installed in rear of a finishing mill(13) to detect a shape of top end of traveling strip(12) passing through the run-out table(15) after coming out of the finishing mill; a shape correction unit part(200) installed in front of upper and lower pinch rolls(17,18) of a down coiler to immediately correct upward bending of the top end(12a) of the strip by receiving the shape information on the top end of the strip detected in the shape detection part in realtime; and a cooling unit part(300) for cooling a plurality of rotary blades(205) and other accessories of the shape correction unit part.

Description

Apparatus for reforming shape of hot strip on a run-out table}

The present invention relates to an upward bending correction device of a hot rolled strip end part in a hot rolling process, and more specifically, an upward bending phenomenon occurring on a strip end part on a transfer table during a process in which a hot rolled strip passes through a final finishing mill and is transferred to a winder. The present invention relates to a strip leading edge upward bending correction device on a transfer table, which detects in real time and immediately calibrates the strip leading edge of a strip leading edge and a winding machine entry obstacle.

In general, as shown in FIG. 1, the hot rolled strip 12 that has been rolled in the finishing mill 13 is cooled to an appropriate temperature by a cooling device 16 on a run-out table 15, and then, It is wound around the winding machine 19 via the lower pinch rolls 17 and 18.

At this time, the cooling device 16 installed in the upper portion of the transfer table 15 is composed of 15 to 17 banks (16a) is to be watered by varying the number of banks according to the steel grade, thickness, target winding temperature. The first bank 16a closest to the finishing mill 13 cannot be used due to various problems such as shaking of the measuring instrument during bending, bending, overlapping of the tip end, and the like.

The first bank (16a) is located immediately after the rear of the finishing mill (13), the meter pile fluctuation occurs due to the generation of water vapor during the water injection, the inflow of the residual water, and the friction between the upper and lower water pressure difference and the cooling water and the strip Due to the poor runability caused by bending or overlapping the tip portion.

In addition, as the temperature is suddenly cooled at a high temperature on the rear side of the finishing mill 13, the front end portion of the hot rolled strip is rapidly cooled, and the single-acting roller 14 of the transfer table 15 and the upper and lower pinch rolls of the front end of the winding machine ( 17, 18, mandrel 19 or the like to form a stamp mark, there is a problem such as to increase the surface defects of the hot rolled strip.

On the other hand, many types of hot rolled strips produced in hot rolling mills have strength and characteristics according to the steel grade. However, when working on high carbon steel or extreme thick material, the pump is pumped on the transfer table as designed by the calculator of the electric controller to maintain a proper temperature, but then the strip tip 12a in the process of spraying the coolant for cooling the facility in the winding area. As a result of the local subcooling and the increase in strength, the bending of the strip tip portion 12a occurs as shown in FIG. 2, and thus the strip tip portion 12a is not bent on the upper and lower pinch rolls, thereby making it impossible to enter the winding machine. There is a problem in that a defect occurs when measuring the specimen material due to the material deviation due to the intensive injection of the rear end, and the like, or stamping occurs.

In addition, according to the conventional technique shown in Fig. 3, the strip 12 exiting the finishing mill 13 at high speed is rolled from about 1.0 [mm] to about 22 [mm] in thickness, in particular 1.6 [mm]. As the thickness becomes thinner or less, the runability becomes unstable, so that the upward bending occurs frequently in the form where the strip tip portion 12a is taken or floated between the single-acting rollers 14, so that the rolling starts to correct the bending of the strip 12 during hot rolling. Before the zero point adjustment is performed by measuring both the rolling roll gap on the driving side and the driver side, hot rolling is performed.

In the finishing mill 13, the thickness control of the F1 to F6 stands is performed by the servo control system 33 controlling the flow path of the servo valve 34, which raises or lowers the cylinder 35 above the backup roll of the finishing mill. It is lowered to control the thickness of the product.

In order to precisely control the thickness of the product, the feedback of the main and pilot spools of the servo valve 34 must be accurately received. Therefore, the micro-signal of the field amplifier receives the feedback through a special cable, and the control signal is also controlled through the special cable.

However, the roll gap of the finishing mill 13 is due to the occurrence of a deviation due to the backlash of the screw 30 when the roll rises or falls in the finishing mill 13, the thickness variation of the strip 12, the local thermal variation, and the like. When rolling, the strip 12 is warped and the current value of the servo valve 34 is changed due to the information transmission error between the servo control system 33 and the hydraulic position control PLC 32 or the finishing rolling PLC 31. There is also a problem in the occurrence of equipment accidents and defective products due to severe warpage in the tip portion (12a) of (12).

In addition, as shown in the detailed view of FIG. 3, the very thin strip 12 passes through the final finishing mill 13 and at the same time the tip portion 12a is flown by the air pressure 400 in the atmosphere and the rear portion thereof. As it is bent, a lot of scratches are continuously generated in the form of a string in contact with the lower guide 40 of the transfer table 15, which is unsuitable for not only rigid surface products but also general hot rolled products. do.

And, in the past, the driver observes with the naked eye or monitors the camera for the measurement of the bending of the strip 12, but due to the generation of high heat, dust and noise in the workplace, it is difficult to observe the site and consumes manpower. Monitoring has the problem that it is difficult to read the warpage of the strip due to scale, dust and water vapor.

On the other hand, looking at the pinch roll (17, 18) pass state of the strip 12 shown in Figure 4a, the pinch roll (17, 18) Equipment to stop the operation of the rolling equipment in order to handle the stacking and the malfunction in the event of a malfunction when the upper pinch roll 17 hits the upper pinch roll (17) while flying to the upper pinch or caught in the lower pinch roll (18). There is a problem in that the down time is excessively generated and thus a production stop occurs to decrease productivity.

In addition, when the equipment is forcibly operated in a state where upward bending occurs at the leading end portion 12a of the strip shown in FIG. 4A, breakage of the transfer table 15 and the pinch rolls 17 and 18 occurs, thereby providing time and economical benefits. There was a problem that a huge loss occurs.

Accordingly, the present invention has been made to solve the above problems, the present invention is to detect the shape of the upward detection phenomenon occurs in the leading edge of the strip on the transfer table during the process of the strip is passed through the final finishing mill to the winder. It can be detected in real time by using real-time detection and immediately corrected by using the upward bending correction device at the rear end, so that rewinding operation can be omitted by preventing the occurrence of winding failure due to plate overlap due to bending of strip leading edge and entry failure to winder. Therefore, an object of the present invention is to provide a strip leading end upward bending correction device on a transfer table that can improve the direct feed rate and work productivity of a cold rolled feed material.

Figure 1 is a schematic diagram showing the progress of the strip in a typical hot rolling process

Figure 2 is a perspective view showing in detail the cooling device (lamina flow) of the conventional hot rolling process, the nozzle header and the strip traveling on the transfer table

Figure 3 is a schematic diagram illustrating a state in which the leading end upward bending occurs in the conventional hot rolled strips

4A and 4B are reference views showing comparisons between a lamination state and a normal curling state, respectively, due to the occurrence of an upward deflection of a conventional strip tip.

5 is an overall configuration diagram of the strip leading edge upward bending correction device on the transfer table according to an embodiment of the present invention;

6A is a detailed configuration diagram of the shape detector of FIG. 5.

Figure 6b is an exploded perspective view of the shape correction unit and the cooling unit

7 is a schematic configuration diagram of a control unit for driving a shape correction apparatus according to the present invention;

8A and 8B are perspective views showing an operating state of the shape correction apparatus according to the present invention.

9 is a flow chart illustrating a strip leading end upward bending correction operation according to the present invention.

<Description of the symbols for the main parts of the drawings>

12: hot rolled strip 12a: strip end

13: finishing mill 14: single-acting roller

15 transfer table 16 cooling device

17,18: pinch roll 19: winder

25: backward entry detector 26: forward entry detector

31: finishing mill PLC 100: shape detection unit

101: displacement sensor 102: drive circuit

103: amplification circuit 104: semiconductor laser

105: light position detecting element 106: floodlight lens

107: light receiving lens 200: shape correction unit

201: Slide guide 201a: Rotating blade insertion groove

202: protectors 203,216,217: fixed base

204: rotary motor 205: rotary wing

206,214,215: Bearing block 207,208: Sliding block

209: sliding connecting shaft 210: fixing bolt

211,212: Air nozzle 213,304: Electronic valve

218,219: Support base 220: Up-down cylinder

220a, 221a, 222a: Rod 221,222: Cylinder Guide

300: cooling unit 301: nozzle

302: cooling zone 304: electronic valve

In order to achieve the above object, the present invention includes a shape detecting unit for exiting the finishing mill and detects the running shape of the strip front end passing through the transfer table at a high speed; A shape correction device unit installed on the upper and lower pinch rolls of the guiding machine and immediately receiving the shape information of the strip tip detected by the shape detecting unit in real time to immediately correct upward bending of the strip tip; It is provided a strip leading end upward bending correction device on the transfer table, characterized in that consisting of a cooling device for cooling the plurality of rotary blades and other accessory spheres of the shape correction device.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention with reference to the accompanying drawings in detail as follows.

FIG. 5 is an overall configuration diagram of a strip leading end upward bending correction device on a transfer table according to an embodiment of the present invention. The present invention is installed at the rear end of the finishing mill 13 and exits the finishing mill. A shape detecting unit (100) for detecting a running shape of the leading end (12a) of the strip (12) passing therethrough; It is installed on the upper and lower pinch rolls 17 and 18 in front of the odor machine 19 and receives the shape information of the strip tip portion 12a detected by the shape detecting unit 100 in real time to increase the bending of the strip tip portion 12a. Shape correction device 200 to immediately correct; It consists of a cooling device unit 300 for cooling the plurality of rotary blades 205 and other accessory spheres of the shape correction unit 200.

6A is a detailed configuration diagram of the shape detecting unit of FIG. 5. As shown in FIG. 6A, the shape detecting unit 100 is located on the transfer table 15 in front of the shape correcting unit 200. The casing has a rectangular shape and a driving circuit 102 for driving the displacement sensor 101 is placed on the upper left side of the casing, and the semiconductor laser 104 is assembled under the driving circuit 102 in a straight line. Below the semiconductor laser 104, a transmissive lens 106 through which the light of the semiconductor laser 104 is transmitted is attached.

On the other hand, a light receiving lens 107 for reflecting the light of the semiconductor laser 104 is received at the lower end of the casing is attached to the lower end, and the semiconductor laser light of the measurement object received by the light receiving lens 107 is attached to the center. An optical position detecting element 105 for converting the position value is located, and a signal amplifying circuit 103 for amplifying the converted position value of the optical position detecting element 105 with a current is assembled at the top.

In addition, a pinch roll entry detector 25 provided at a rearward distance from the rear of the pinch rolls 17 and 18 to detect whether the strip 12 is entering the pinch rolls 17 and 18 passing on the transfer table 15. 5 is installed, and in front of the shape correction unit 200 to detect whether the strip 12 passing through the transfer table 15 to the shape correction unit 200; A forward entry detector 26 (see Fig. 5) provided at a predetermined distance is provided.

6B is an exploded perspective view of the shape correcting unit and the cooling unit, wherein the shape correcting unit 200 is firmly fixed to the L-shaped fixing bases 216 and 217 on both sides of the transfer table 15. 216 and 217 are formed with bearing blocks 214 and 215 into which the protectors 202 are inserted in the upper part in the direction of the finishing mill 13, and the support bases 218 and 219 are plate-shaped in the vertical direction of the fixed base 216 and 217. Up and down cylinders 220 and cylinder guides 221 and 222 are assembled to the support bases 218 and 219, respectively.

The protector 202 on the upper portion of the slide guide 201 is integrally formed by welding in a streamlined form, and the slide guide 201 is formed with a plurality of rotary blade insertion grooves 201a, so that the insertion grooves 201a are formed. A plurality of rotary blades 205 are inserted into each.

Each of the plurality of rotary blades 205 inserted into the insertion grooves 201a is integrally attached to each of the streamlined wings in a direction of an angle, and a rotating shaft groove is formed at the center thereof so that the rotating shaft passes through the groove. The plurality of rotary blades 205 is configured to be integrally rotated by the rotary shaft, a plurality of rotary motor 204 is fixed to the plurality of fixed base 203 on the work side of the rotary shaft and the opposite side The bearing side 206 is simply inserted into the drive side of the rotating shaft to secure and support the rotation guide is firmly fixed to the upper slide guide 201.

The slide guide 201 is formed with its tail end smoothly upward, and sliding blocks 207 and 208 on both sides of the slide guide 201 are inserted into the upper part of the slide guide shaft 209 for connecting the cylinder 220 block. Each of the connecting shafts 209 through which the up and down cylinders 220 and the rods 220a, 221a and 222a of the cylinder guides 221 and 222 penetrate into the sliding blocks 207 and 208 are formed by the fixing bolt 210. It is assembled and fixed with fine play.

In addition, the lower end of the slide guide 201 is formed in a concave-convex shape as shown in the detail of FIG. There is a nozzle 211, the shape correction device 200 is finally configured to connect the air nozzle 211 to the electromagnetic valve 213.

The cooling device 300 is a surface of the plurality of rotary blades 205 caused by the radiant heat of the strip 12 through which the shape correction device 200 exposed to high heat or the upstream bending correction of the strip tip portion 12a. Several nozzles 301 are provided for local cooling.

Each cooling water line in which the plurality of nozzles 301 is combined has a frame in the form of a cooling stand 302, and is positioned on the upper part of the plurality of rotary blades 205, and then fixed on the upper sides of the two L-shaped fixing bases 216 and 217, respectively. And it is configured to be installed on the bottom of the L-shaped fixed base 217, the electromagnetic valve 304 for controlling the cooling water.

The signal amplification circuit 103 signal of the shape detecting unit 100 is described as follows with reference to FIG.

First, the displacement sensor 101 detects the degree of upward bending shape of the strip tip portion 12a on the transfer table 15, and converts and calculates the analog signal of the detected shape in the control unit 110 so as to deviate from the condition. Sending a response signal to the (31) and the finishing mill PLC (31) gives a real-time signal to the upper and lower operating cylinder electromagnetic valve 213 and the plurality of rotating motors (204) of the shape detection unit 100 by the received information received It is configured to work immediately.

8A and 8B are perspective views illustrating an operation state of the shape correcting apparatus unit according to the present invention, and FIG. 9 is a flowchart illustrating an operation of correcting the upstream bending deflection of the strip tip according to the present invention. Referring to the operation and the resulting effects in detail as follows.

First, when the tip 12 of the strip 12 is bent upwardly, the final finishing mill 13 extracting speed is higher than that of the feed table speed, so that the tip of the secondary and tertiary strips 12 is overlapped. In the state in which the ends of the overlapping state is quenched by the cooling water of the lamina flow (16) facility, which is a cooling device, the pinch rolls (17, 18) of the winder enter the state in which the overlap strength of the front end of the strip 12 is large. It is impossible to smoothly enter the strip tip portion upward, so a winding failure phenomenon of the coil 20 appears. And the tendency of winding malfunction occurs mainly in the material and narrow strip 12, that is, the thickness ≤2.0 and the width ≤1270 mm material and the high speed of the finishing mill after the finishing mill and the weight of the coil 20 mainly. The reason for this is the difference between the upper and lower work roll diameters, but when the upper roll diameter is smaller than the lower roll, the strip tip 12a is more upwardly generated, that is, the strip 12 is bent toward the smaller circumferential ratio.

In addition, due to the difference between the speed of the final finishing mill 13 and the speed of the conveying table 15, the advance rate of the conveying table 15 speed is lower than that of the finishing mill 13, so The strip tip 12a is raised.

Therefore, in the present invention, when the leading edge 12a exiting the final finishing mill 13 shown in FIG. 5 and passing through the transfer table 15 at a high speed out of the control range occurs, the leading edge 12a Displacement sensor 101 provided above the transfer table 15 emits a beam of the semiconductor laser 104, and the beam of the emitted semiconductor laser 104 passes through the transmissive lens to transmit the strip shape 12a. Is reached.

At this time, when the beam of the semiconductor laser passes through the light receiving lens 107 by the displacement difference between the shape of the strip tip portion 12a and the reference position and reaches the optical position detecting element 105, the optical position detecting value is again converted into a signal amplifying circuit. Transmitting an analog signal of the signal amplifying circuit 103 to the CPU to the CPU 103, the upward bending of the strip tip portion 12a detected by the A / D converter and the calculator in the CPU is outside the management range. To control whether or not

The upward bending information of the strip tip portion 12a outside the control range is sent to the finishing mill PLC 31 and the monitor screen, and the finishing mill PLC 31 immediately moves up and down the slide guide 201 upon receiving the received response signal. A falling signal is transmitted to the electromagnetic valve (not shown) of the operation cylinder, and a driving signal is transmitted to the plurality of rotary motors 204, but it is not activated yet and is stopped in the standby state.

As described above, when the vertical operation cylinder 220 and the plurality of rotary motors 204 of the slide guide are stopped in the standby state, and the strip tip portion 12a is shielded by the front entry detector 26, a plurality of rotations are performed at an instantaneous speed. At the same time as the motor 204 is rotated to drive, the upper and lower operation cylinder 220 descends quickly, and at the same time, the plurality of rotary motors 204 are driven to rotate the plurality of rotary blades 205 and the strip tip portion 12a. The up-front bending portions of)) come into contact with each other and the strip leading end portion 12a, which is advanced upward, immediately descends.

In this way, the strip tip portion 12a is immediately downwardly plated by the plurality of rotary blades 205, and at the same time, it is installed to be inclined upward in the direction of the strip 12 between the rollers in order to improve the driving efficiency of the strip tip portion 12a. At the same time, air is injected from the lower air nozzle 212 and the upper air nozzle 211 which is inclined downward in the advancing direction of the strip 12 at the lower end of the slide guide 201 to maximize the driving efficiency of the strip tip portion 12a. .

On the other hand, the upper and lower operation cylinder 220 of the slide guide is rapidly raised and driven at the same time when the strip front end portion 12a having improved mail driving performance is blocked by the rear entry detector 25 installed behind the pinch rolls 17 and 18. While the plurality of rotary motors 204 also stops driving, the plurality of rotary blades 205 also stops rotating.

When the above operation is terminated, the coolant solenoid 304 installed below the A-shaped fixed base 217 is operated only for a predetermined time (for example, about 1 minute), thereby radiating heat or the front end of the strip 12 which is passed through. (12a) Cooling water is finely injected from the plurality of nozzles 301 connected to the cooling table 302 to cool the surface of the plurality of rotor blades 205 caused by the upward bending correction. Due to the cooling of the surface of the plurality of rotary blades 205 and the slide guide 201 is terminated the action of the strip leading upward bending correction device on the transfer table.

According to the present invention, when the upward bending phenomenon occurs on the leading end of the strip on the transfer table during the process of the strip passing through the final finishing mill to the winder, the leading edge upward bending phenomenon immediately using the strip leading edge upward bending correction device on the transfer table This prevents malfunction on the transfer table due to bending of the strip end and prevents malfunction during winding work, which not only improves the productivity of work due to the increase of facility utilization, but also prevents large-scale equipment accidents, thereby improving the delivery deadline in the manufacturing process. In particular, the unnecessary post-rewinding step for eliminating the overlapping part of the hot rolled steel sheet supplied for the cold rolled material is omitted, thereby improving the error rate and improving the hot rolling and cold rolling rates.

Claims (1)

A shape detecting unit (100) installed at the rear end of the finishing mill (13) and detecting the running shape of the front end (12a) of the strip (12) passing through the feeding table (15); It is installed on the upper and lower pinch rolls 17 and 18 in front of the gussetgi and immediately receives the shape information of the strip tip 12a detected by the shape detecting unit 100 in real time to immediately correct the upward bending of the strip tip 12a. Shape correction apparatus 200; Strip tip end upward bending correction device characterized in that consisting of a cooling device unit 300 for cooling the plurality of rotary blades (205) and other accessory spheres of the shape correction unit (200).