KR20010065705A - Correcting apparatus of strip meandering for welder - Google Patents

Abstract

PURPOSE: A strip serpentine compensator of a welding machine is provided to prevent a serpentine by installing two PADs and fixing both faces of a strip. CONSTITUTION: A strip serpentine compensator comprises an indicating unit installed a touch on/off switch to operate PADs(Paralleller Adjustment Device); an interface unit to share information of a welding machine PLC(Programming Logic Control) and upper PLCs; a paralleler(20) composed of a first PAD, a second PAD and a third Pad in an outlet pass line, an inlet upper pass line and an inlet lower pass line of a strip; a hydraulic brake(22) to brake the paralleler(20) by installing in a ball screw bar(21); a hydraulic motor(23) to rotate the ball screw bar(21); a hydraulic valve(24) operated by the PLC to control a speed of the hydraulic motor(23); an encoder(26) connected with a timing belt(25) between the hydraulic brake(22) and the hydraulic motor(23); a converter(27) to convert data of the encoder(26); a clamp(29) to fix the both faces of the strip by installing in a body(28); a first photosensor(30) to detect the end of the strip; a second photosensor(31) to detect a stopped position of the paralleler; an open proximity sensor(32) and a cross proximity sensor(33) to detect an operated state of the clamp(29). Thereby, a welding defect is prevented.

Description

Strip meander compensator for welding machine {CORRECTING APPARATUS OF STRIP MEANDERING FOR WELDER}

The present invention is to prevent the meandering of the strip due to the welding failure in the automatic welding machine installed in the continuous annealing during the cold rolling process of the steel plant, more specifically, the meandering of the strip during the welding by aligning the leading and trailing strip to the line center The present invention relates to a strip meander compensator for a welder, which can be prevented.

In general, in the continuous annealing process, the welder rapidly welds the trailing end of the preceding strip and the trailing strip in order to continuously supply the strip to the annealing furnace. When the strips S2 are superimposed on each other and the electricity is applied to the overlapping portion, heat is generated by the electrical resistance of the contact portion, and electric resistance welding is performed by dissolving and fusing the lead and trailing strips S1 and S2 with this heat.

The operation sequence of the welding machine is to wait for the leading end of the trailing strip S2 in the cutter of the welding machine, stop the trailing edge of the preceding strip S1 in the cutter, and then use the entry and exit clamps 1 and 2 to carry out the preceding and following strips ( S1) (S2) is fixed.

In this state, the rear end portion of the preceding strip S1 and the leading end portion of the trailing strip S2 are cut. When the cutting mode of the cutter is three cutting modes, the entrance clamp 1 is opened to cut the preceding strip S1. After drawing the front end from the entrance clamp (1), cross the entrance clamp (1) and form a loop in the trailing strip (S2) so that the strip overlaps by the cut interval.

And after the exit clamp 2 is inclined to the upper side, the entrance clamp 1 is advanced in the exit direction to set the plate overlap, and the exit clamp 2 is inclined downward to the original position and the preceding strip S1 and the trailing strip S2. After matching the widths of the electrodes, pressure is applied to the upper electrode 3 to contact the lower electrode 4, and then rotated to energize the upper and lower electrodes 3 and 4, and at the same time the carriage width of the strip. Weld while moving in the direction.

When the strip is welded in this manner, the upper electrode 3 is raised, the entrance clamp 1 and the exit clamp 2 are opened, and the carriage is moved to the origin to complete the welding operation.

On the other hand, if the meandering occurs due to the interference of the mechanical device and the bending or looping of the strip when the trailing strip S2 or the preceding strip S1 is moved into the cutter of the welding machine, after the welding of the front and trailing strips S1 and S2 is completed, Since the meandering occurs at the entry and exit roofing tower, the strip is broken due to tension in the furnace and a long period of equipment shutdown occurs, so a device that can prevent this is urgently required.

Conventionally, as shown in FIG. 2, the hydraulic cylinder 5 is used to correct the meandering of the strip S to prevent the meandering of the strip. However, the hydraulic cylinder 5 has a thickness of 0.4 t to As it is inconsistent as 2.3t, it is difficult to adjust the pressure of the hydraulic cylinder 5, so it is fixed based on the thickness of the intermediate material, so that the strip (S) is affected by the impact of the strip guider when working the thin material of 0.4t ~ 0.6t. When the edge portion of the crushed or thick working material of 2.0t ~ 2.3t when the work is not made due to the lack of pressure of the hydraulic cylinder (5).

In this case, since the driver performs manual work to correct the meandering of the strip S, safety accidents are caused and the meandering of the strip S due to the naked eye cannot be accurately corrected. If the furnace is made, the strip (S) is a cause of breakage, there was a problem that a long time equipment shutdown occurs.

The present invention has been invented to solve the above problems, and the two parallel devices are installed on the leading and trailing strips, and both sides of the strips are fixed to calculate the travel distance of the parallel devices. It is an object of the present invention to provide a strip meander compensator for welders which prevents meandering of the leading and trailing strips during welding.

The present invention for achieving the above object to prevent the meandering of the strip (S) due to the poor welding of the strip welded to the automatic welder installed in the continuous annealing during the cold rolling process of the plant, to prevent the meandering of the strip Instructor equipped with a touch on / off switch for selecting a driver to operate the parallel device, an interface unit for sharing information of the welding machine PLC and the upper process PLC, the exit pass line and the upper pass line of the strip. And a parallel device comprising first, second and third parallel devices respectively provided in the entry lower pass line, and a hydraulic brake provided at the rear end of the ball screw bar provided in each parallel device to brake the parallel device. Hydraulic motor which performs forward / reverse rotation of the ball screw bar, and PlC welding machine to adjust the speed of the hydraulic motor Dynamic hydraulic valve, an encoder connected to the timing belt installed between the hydraulic brake and the hydraulic motor, a transducer for converting the data of the encoder, and installed in the body of the parallel device and operated by the hydraulic line strip A clamp for fixing both sides of the strip, a first photo sensor for detecting an end of the strip, a second photo sensor for detecting a stop point of the parallel device, and an open proximity sensor and a cross proximity sensor for monitoring the operation state of the clamp; It was done.

1 is a cross-sectional view showing a general welding device,

2 is a perspective view showing a conventional meander correction device;

Figure 3 is a perspective view showing the welding is installed, the meander prevention device according to the present invention,

4 is a cross-sectional view of a parallel device according to the present invention;

5 is a cross-sectional view of the welding machine is installed meandering prevention device according to the present invention,

Figure 6 is a plan view of a state to correct the meandering of the strip with a conventional meander correction device,

7 is a departure control flowchart of the meandering prevention device according to the present invention;

8 is an entrance control flowchart of a meandering prevention device according to the present invention;

9 is an entry lower side parallel device control flowchart;

<Description of Symbols for Major Parts of Drawings>

S: strip 10: indicator

20: parallel device 20a: first parallel device

20b: second parallel device 20c: third parallel device

21: Ball screw bar 22: Hydraulic brake

23: hydraulic motor 24: hydraulic valve

25: timing belt 26: encoder

27: converter 28: body

29 clamp 30 first photo sensor

31: second photo sensor 32: open proximity sensor

33: cross proximity sensor

Hereinafter, the present invention will be described in detail with reference to FIGS. 3 to 5.

Figure 3 is a perspective view showing a welding is installed in accordance with the present invention, Figure 4 is a cross-sectional view of a parallel apparatus according to the present invention, Figure 5 is a cross-sectional view of a welding machine is installed with a meandering prevention device according to the present invention, the present invention Is composed of an instruction unit 10 for operating a parallel device (PAD: Raraleller Adjustment Device), an interface unit and a parallel device for sharing information of the welding machine PLC (programming logic control) and the upper process PLC.

The indicating unit 10 is composed of a touch on / off switch that allows the driver to select the use of a parallel device. The parallel device includes two first parallel devices 20a and an exit upper pass line on an exit pass line. Two second parallel devices 20b in the entry up pass line and two third parallel devices 20c in the entry down pass line.

Each parallel device 20 is provided with a hydraulic brake 22 for braking the parallel device 20 at the rear end of the ball screw bar 21 and the ball screw bar ( A hydraulic motor 23 for performing forward / reversing of the 21 is installed, and the hydraulic valve 24 for adjusting the speed control of the hydraulic motor is a welding machine. It is installed to be controllable by PL.

Meanwhile, a timing belt 25 is installed between the hydraulic brake 22 and the hydraulic motor 23 to be connected to the encoder 26 and to the feedback coefficient of the distance coefficient of the ball screw bar 21. The corresponding data is transmitted to the converter 27 for the encoder 26 and then converted into digital data to be sent to the welder PI. The welder PI is configured to compare the output value with the input value.

And the clamp 28 for fixing both sides of the strip (S) to the body 28 of the parallel device is installed operatively by the hydraulic line and the first photosensor 30 for detecting the end of the strip (S) And a second photo sensor 31 for detecting a stop point of the parallel device and an open proximity sensor 32 and a cross proximity sensor 33 for monitoring the operation state of the clamp 29 are installed. The forward and backward movement of the device body 28 is operable by the screw connection part 34 when the ball screw bar 21 rotates forward and reverse.

Hereinafter, the present invention will be described in detail with reference to Examples.

As shown in FIG. 6, the driving order of the parallel device is based on the meandering strip S and when the second parallel device 20b and the third parallel device 20c move forward to grab the face of the strip S and stop. The welding machine PLC calculates the distance coefficient of each parallel device, and moves the second parallel device 20b or the third parallel device 20c at low speed to be located at the line center C. In the welder PI, the second parallel device 20b and the third parallel device 20c are reversed and moved to an initial point, thereby completing the operation.

As shown in FIGS. 7 to 9, FIG. 7 is an exit control flow chart of the meandering prevention device according to the present invention, and FIG. 8 is an entrance control flow chart of the meandering prevention device according to the present invention. 9 is a flow chart of the control of the lower side of the inlet side. When the driver instructs the parallel device, the second parallel device 20b and the third parallel device 20c advance at high speed and the end of the strip S is moved. When the first and second photosensors 30 and 31 sense, the parallel device is accelerated at low speed, and when the photosensor for detecting the stop point of the parallel devices is operated, the second and third parallel devices 20b and 20c. Is stopped and the distance traveled by each parallel device is calculated in the welder PI.

At this time, if both sides of the strip S are clamped and the cross proximity sensor 33 is operated, the welding machine PLC checks whether entry line reversal is possible in the upper process PLC, and the welding machine PLC generates the strip loop. If requested, raise the looper roll on the entry tap after 2 seconds.

If the looper is generated and the looper more than 250mnm is generated, the looper generation is stopped and completed.When the looper is requested, the looper creation completed push button lamp on the panel is repeatedly turned on and off, and the driver confirms the looper generation and the looper creation completed pushbutton lamp. Press to light the lamp.

After the looping roll roll descending instruction and the completion check of the completion of the lowering is completed, if the value obtained by subtracting the travel distance of the second parallel device 20b from the travel distance of the third parallel device 20c is less than "0", the second parallel device ( 20b) is reversed at a low speed, positioned in parallel with the third paralleling device 20c, and then stopped, and a value obtained by subtracting the traveling distance of the second paralleling device 20b from the traveling distance of the third paralleling device 20c is obtained. If larger than "0", the third paralleling device 20c moves backward at a low speed, is positioned in parallel with the second paralleling device 20b, and stops.

On the other hand, when the entry parallelism parallel device stops, the value obtained by subtracting the travel distance of the third parallel device 20c from the original position of the second parallel device 20b is 75 mm or more, or the advance distance of the third parallel device 20c is equal to the machine. When the protective device is at the limit distance, the second parallel device 20b is stopped and the drive of the parallel device is stopped due to the occurrence of abnormal mouth gap.

When the entry parallelism parallel device stops, the value obtained by subtracting the traveling distance position of the second parallel device 20b from the original position of the third parallel device 20c is not less than 75 mm or the forward distance of the second parallel device 20b is increased. When the machine protection device is at the limit distance, the third parallel device 20c is stopped and the drive of the parallel device is stopped due to the occurrence of an entry gap.

As described above, according to the present invention, a plurality of parallel devices are installed in the leading and trailing strips during the welding operation in the cold rolling annealing process to detect the meandering of the strip by the traveling distance of the parallel device. It is a very useful invention that can prevent the welding defects due to meandering in advance because it can be confirmed by corrective measures.

Claims (1)

In the cold rolling process of the plant to prevent the meandering of the strip (S) due to the poor welding of the strip welded by the automatic welding machine installed in the continuous annealing, An indicator 10 equipped with a touch on / off switch for selecting a driver to operate a parallel device (PAD) to prevent meandering of the strip S, a welding machine PLC and First, second and third paralleling devices 20a provided at the interface unit for sharing information of the upper stage PLC, and at the exit pass line, the entrance upper pass line and the entrance lower pass line of the strip S, respectively. (20b) and (20c) the parallel device 20, and the hydraulic brake 22 is installed at the rear end of the ball screw bar 21 provided in each of the parallel device 20 to brake the parallel device 20 and A hydraulic motor 23 for performing the forward and reverse rotation of the ball screw bar 21, a hydraulic valve 24 operated by the welding machine PLC to adjust the speed of the hydraulic motor 23, and On the timing belt 25 installed between the hydraulic brake 22 and the hydraulic motor 23. The encoder 26 to be connected, the transducer 27 for converting the data of the encoder 26, and the body 28 of the parallel device is installed on the fixed side of the strip (S) as operated by the hydraulic line Clamp 29, the first photosensor 30 for detecting the end of the strip (S), the second photosensor 31 for detecting the stop point of the parallel device, the operation state of the clamp 29 Strip meander correction device for a welder, characterized in that it comprises an open proximity sensor 32 and a cross proximity sensor 33 to monitor.