KR20090081213A - Auxiliary apparatus and control method of it for discharging of double blank - Google Patents

Abstract

An auxiliary apparatus for discharging double blank and a control method thereof are provided to prevent collision and interference with a blank by preventing the blank from sagging as a guide bar supports the blank. An auxiliary device(14) for discharging double blank comprises a PLC, a guide bar(15), and a driving unit(21). The PLC controls to discharge the blank in the blank detection to outside. The guide bar prevents the blank from sagging by supporting the blank by moving outside before discharging the blank to outside with a magnetic belt conveyor. The driving unit moves the guide bar forward or backward as control signals are inputted from the PLC in discharging the blank.

Description

Auxiliary apparatus and control method of it for discharging of double blank}

The present invention relates to a material separation device (also known as a destacker) that loads and prepares a large amount of material and then sequentially loads one by one to the first pressing station of the press. The present invention relates to a double blank discharge aid and a control method thereof to prevent a system shutdown and productivity decrease due to incompleteness.

Press is a machine that manufactures products in required shape by shearing work, forming work, and squeezing work using plasticity of materials such as various metal sheets, plastics, and fibers. It is suitable for production and is widely used throughout the industry.

These presses can be divided into cutting, punching, blanking, piercing, bending, drawing, and embossing according to the processing process. Press molds of various structures are used here.

Meanwhile, in order to improve the productivity of the press, loading and unloading of materials are automated.

However, the prior art involves many difficulties in applying to a multi step process press system in which the material is sequentially loaded into a plurality of pressing stations and manufactured into a finished product.

That is, for continuous and stable loading of materials, a large amount of materials should be loaded and prepared, and then sequentially loaded one by one in the first pressing station of the press.

In general, in a press line for producing vehicle body parts (Panel), conventionally, only steel (magnetic) material was produced, and thus, the material (blank) was separated and washed one by one from the material pile, and automatically injected into the press.

A device that automatically separates and inserts material into a press is sometimes referred to as a destacker equipment.

This material separating device, the destacker equipment, uses the characteristics of a magnet called a magnetic floater (MAGNETIC FLOATER) to feed the separated material into the press.

10 and 11 are diagrams showing the configuration of the automatic material input device (destainer) according to the prior art.

10 and 11, the automatic material input device according to the prior art is a DESTACKING unit 110, the magnetic floater (MAGNETIC FLOATER) 120, the vacuum cylinder (VACUUM CYLINDER) 130, magnetic MAGNETIC BELT CONVEYOR (140), WASHING UNIT (150), CENTERING DEVICE (160), DOUBLE BLANK (170), FILTERING UNIT Consists of including.

Referring to Figures 10 and 11 will be described the operating state of the automatic material input device applied in the production of steel (STEEL) using the automatic material input device according to the prior art.

First, a pile of material is loaded into a crane saver by a forklift.

Subsequently, the pile of material on the crane saber is moved to the destacking unit 110, and the magnetic plotter 120 separates one sheet from the pile of materials.

Thereafter, the vacuum cylinder 130 descends, absorbs one piece of material, and then rises, and one piece of material is attached to the magnetic belt conveyor 140 and transported. Then, one sheet of material is washed cleanly while passing through the cleaning device 150 and transferred to the centering device 160. When one sheet of material is centered, the material is adsorbed into the press 190 by an automation device such as a loader. Automatic production is achieved by successively repeating a series of processes.

12 is a view illustrating a material separation method using a general automatic material input device.

Referring to Figure 12 describes the material separation method when producing a steel material as follows.

First, when the magnet has the magnetic pole of the N pole, the material has the magnetic pole of the S pole.

At this time, the material is a pushing force is generated and the material and the magnetic plotter 120 is a pulling force is applied to the material is separated.

The separated material is adsorbed to the vacuum cylinder 130 to which the vacuum cup is attached and then transferred to the next process. In FIG. 12, reference numeral 180 denotes a stack lift.

However, when the two cylinders (double blank) or the defective material (the first sheet and the last sheet of the blank) are adsorbed by the vacuum cylinder 130 and transported and supplied to the press machine in such a state, it causes mold breakage of the press machine. do.

Therefore, it is necessary to detect the double blank or the like and prevent the double blank or the like from being conveyed to the press machine.

To this end, in the related art, the magnetic belt conveyor 140 is rotated in reverse to reverse the defective blank (double blank) by the magnetic belt conveyor 140, thereby providing a double blank box disposed at the rear end (left side in the drawing) of the destacking part ( 170) (see FIG. 13).

However, when the defective blank is discharged by the reverse rotation of the magnetic belt conveyor 140, as the rear end of the blank reverses in the direction of the double blank box 170, the amount of the blank separated from the magnetic belt conveyor increases. And the load of the increasing blank increases, causing the blank end to sag (FIG. 13).

Therefore, there is a problem in that the blanks discharged on the top surface of the blanks discharged first or the bottom surface of the double blank box 170 are subsequently collided and interfered to prevent the discharges from being performed normally.

In addition, since the discharge of the defective blank is not completed, the worker must go up directly to discharge the blank by hand, and the production is stopped while the worker processes the blank, thereby decreasing productivity.

Then, the magnetic belt conveyor 140 is damaged by the discharge incomplete blank, there is a risk that a safety accident of the operator occurs.

The present invention has been made in view of the above, it is configured to move the double blank discharge guide bar to the outside in the lower portion of the magnetic belt conveyor, to support the lower surface of the discharged blank blank to prevent the occurrence of deflection of the blank, The purpose of the present invention is to provide a double blank discharge aid and a control method thereof, which can prevent the system shutdown and the productivity decrease due to the incomplete discharge of the blank blank.

In order to achieve the above object, the present invention is to separately separate one by one by using a magnetic plotter, and then to absorb a blank cylinder and transfer it through a magnetic belt conveyor to supply one blank in a press. In discharging two double blanks or bad blanks (hereinafter abbreviated as blank) in the destacker system,

A PLC controlling to discharge the blank outward upon detection of the blank;

A guide bar which moves outwards to support the blanks in advance just before the blanks are discharged outwards by the magnetic belt conveyor to prevent sagging of the blanks; And

It characterized in that it comprises a drive means for receiving the control signal from the PLC when the blank is discharged to move the guide bar forward or backward.

In a preferred embodiment, the guide bar is installed at the lower end of the magnetic belt conveyor discharging the blank, the fixed side guide bar, the moving side guide bar which is moved outwards in advance when the blank is discharged in pairs and installed in plurality in parallel in the discharge direction It is characterized by.

In a more preferred embodiment, the fixed side guide bar and the moving side guide bar is installed in parallel with each other in the discharge direction at regular intervals.

In addition, the fixed side guide bar and the moving side guide bar is characterized in that the end portion is formed to be inclined downward at a predetermined angle to easily enter the fixed side guide bar and the moving side guide bar when the blank is discharged.

Particularly, the driving means may include an LM guide and an LM bearing installed at a lower portion of the movable side guide bar such that the movable side guide bar is slidable in the discharge direction;

An air cylinder for advancing or reversing the moving side guide bar; And

It characterized in that it comprises a forward and reverse solenoid valve for transmitting the air pressure to receive the control signal from the PLC when the blank discharged to advance or reverse the air cylinder.

In addition, it characterized in that it further comprises a forward and backward sensor installed in the front and rear in the discharge direction of the guide bar to detect the forward or backward state of the guide bar.

Another aspect of the present invention provides a method of controlling the auxiliary apparatus for discharging a double blank of claim 6,

Detecting whether the blank is 2 sheets or defective; When detecting a defect or two blanks (hereinafter blank), the guide bar moves outward and waits before the blank is discharged; Conveying the blank over a guide bar by a magnetic belt conveyor; And the blank is supported by the guide bar and is discharged outward, and the blank is prevented from sagging by the guide bar.

In a preferred embodiment, the step of waiting for the guide bar to move outward in advance may include: receiving a control signal from a PLC by a reverse solenoid valve and supplying an operating pressure to an air cylinder;

The air cylinder is supplied with a working pressure to move a moving side guide bar outward; And

The moving side guide bar is moved to the outside, and the fixed side guide bar is fixed to the lower portion of the magnetic belt conveyor, characterized in that to prevent the deflection of the blank by being supported by the fixed side and the moving side guide bar when discharging the blank. do.

In a more preferred embodiment, the step of conveying the blank over the guide bar by the magnetic belt conveyor comprises the steps of the reverse sensing sensor detecting whether the moving side guide bar is reversed; And

The PLC receives the detection signal from the reverse sensing sensor and sends a reverse rotation operation signal to the magnetic belt conveyor, characterized in that it comprises the step of rotating the magnetic belt conveyor.

In addition, the step of discharging to the outside while the blank is supported by the guide bar, the proximity sensor installed on one side of the magnetic belt conveyor to check whether the discharge of the blank is completed;

A forward solenoid valve receiving a control signal from a PLC and supplying an operating pressure to the air cylinder;

The moving side guide bar receives the operating pressure from the air cylinder to move to the original position; And

And receiving, by the PLC, the detection signal from the forward detection sensor to confirm completion of the return of the moving side guide bar.

Finally, generating an error message when the reverse of the moving side guide bar is not completed when the blank is discharged or when the discharge of the blank is not completed or when the return of the moving side guide bar is not completed.

Stopping the destacker system; And

The operator comprises repairing the device.

As seen above, according to the auxiliary apparatus for discharging the double blank according to the present invention and a control method thereof, the blank is discharged while being supported by the guide bar that has already been discharged in the rear direction of the magnetic belt conveyor, so that sagging due to the own weight occurs. It can prevent the collision and interference with the previous blank in advance.

In addition, when the discharge of the blank is not completed due to the deflection of the blank, the operator does not have to stop the equipment to manually remove the blank, thereby improving productivity, and the operator does not have to remove the undischarged blank directly. Therefore, safety accidents can be prevented.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a destacker system according to an embodiment of the present invention, Figure 2 is a perspective view showing the auxiliary apparatus for discharging the double blank in Figure 1, Figure 3 is a perspective view showing the operating state of Figure 2 .

The present invention relates to a material separation device (also known as a destacker) that loads and prepares a large amount of material and sequentially loads one by one to the first pressing station of the press 190.

In particular, the present invention is a double blank discharge aid for preventing a state in which the work is stopped while the defective blank 26 such as the double blank in the destacking unit 10 is not completely discharged by the magnetic belt conveyor (13) And to a control method thereof.

Here, the double blank includes both the first and last sheets of a blank stack prepared by loading a large amount of material, that is, a blank, and a defective blank 26 such as a double blank. The blank 26 used in the detailed description hereinafter refers to the defective blank 26 unless otherwise specified.

The blank stack loaded through the forklift truck is moved from the crane saver 11 to the destacking section 10, and then separated one by one using a magnetic plotter, and the vacuum cylinder descends to absorb and then lift one of the blank stacks. , The blank sheet is attached to the magnetic belt conveyor 13 is conveyed configuration can be implemented by the prior art.

However, in the related art, when the blank 26 is discharged, the blank 26 is caught between the end of the magnetic belt conveyor 13 and the roller guide 31 installed at the lower portion thereof due to the deflection of the blank 26. It was.

The double blank discharge auxiliary device 14 according to the embodiment of the present invention has a blank adsorbed by the vacuum cylinder after the blank adsorbed by the vacuum cylinder is attached to the magnetic belt conveyor 13 as the magnetic belt conveyor 13 is rotated in reverse. It is a device that guides 26 to be completely discharged to the double blank box (12).

The double blank discharging aid 14 is provided with a guide bar 15, 15 ′, a fixing bracket 16, a moving frame 17, a driving means, and all of them on the lower surface of the magnetic belt conveyor 13. Base plate 25 is included.

The double blank discharging aid 14 provides guide bars 15, 15 'to prevent the blank from being caught at the end of the magnetic belt conveyor 13 due to deflection.

The guide bars 15 and 15 'are provided with at least two, and the plurality of guide bars 15 and 15' are installed in parallel with each other as a pair, and the blanks 26 are discharged. Long rods of constant length and diameter to minimize friction and facilitate horizontal movement when the blanks 26 attached to the magnetic belt conveyor 13 by magnetism are moved over the guide bars 15 and 15 '. Form.

Here, the diameter of the guide bar (15, 15 ') can be selected by those skilled in the art in the range that the material is not wasted while having a strength that can support the load of the blank 26, the guide bar (15, The length of 15 ') can be selected by those skilled in the art to the extent that the blank 26 does not sag due to its own weight.

In addition, the pair of guide bars 15 and 15 'is composed of a moving side guide bar 15 moving at the time of blank discharge and a fixed side guide bar 15' fixed to the base plate. 15 extends outward when the blank is discharged to prevent sagging of the blank, and the fixed side guide bar 15 'serves to support the blank together with the magnetic belt conveyor.

Then, the front end portions of the moving side guide bar 15 and the fixed side guide bar 15 'of the guide bars 15 and 15' are provided so that the blank 26 can easily enter the guide bars 15 and 15 '. It is formed to be inclined at an angle downward from the axis.

Before the movable side guide bar 15 is discharged to the outside, the movable side guide bar 15 and the fixed side guide bar 15 'are positioned side by side inside the lower side of the magnetic belt conveyor. Only the bar 15 is retracted while keeping parallel with the fixed side guide bar 15 'at regular intervals.

The moving side guide bar 15 is moved forward and backward on the base plate 25 through a guide means such as a combination of linear bearings and linear guides or roller bearings. It is installed in a sliding structure. At this time, the rear direction is a direction in which the blank 26 moves to the double blank box 12, and the front direction is a direction in which the guide bar 15 moves to the original position. The guide bar described below is the moving side guide bar 15.

The guide bar 15 is connected to the LM bearing 20 by using the fixing bracket 16 and the moving frame 17, the LM guide 19 is fixedly installed on the base plate 25, the LM bearing 20 By being linearly coupled to the upper portion of the LM guide 19, the guide bar 15 is moved back and forth along the LM guide 19.

The guide bar 15 is fixed to the upper surface of the "b" shaped cross section of the fixing bracket 16, the lower end of the fixing bracket 16 is assembled with bolts on the side of the moving frame 17, the L bearing (20) ) Is attached to the lower surface of the square pipe.

The driving means for moving the guide bar 15 in the front and rear directions may use an air cylinder 21 or a motor. For example, when a motor is used, a ball screw is connected to one end of the moving frame 17 and the ball As the motor is operated by connecting the screw and the gear, the moving frame 17 may be moved forward and backward by the rotation of the gear and the ball screw.

As shown in the drawing, in the case of using the air cylinder 21, one side of the moving frame 17 is connected to the plate-shaped connecting bracket 18 in the lateral direction, and the connecting bracket 18 is one end of the air cylinder 21. By being connected to the air cylinder 21, the air pressure is transmitted through the connecting bracket 18 as the air cylinder 21 is operated so that the guide bar 15 moves forward and backward in the front-rear direction.

Air cylinder 21 is provided with a plurality of at least two or more corresponding to the number of the magnetic belt conveyor 13, which is also installed at regular intervals in parallel, the base plate 25 by the cylinder fixing bracket 22 It is fixedly installed.

At this time, one or two guide bars may be installed in one base plate 25, and the front and rear of the base plate 25 may be moved for each base plate 25 to detect the forward and backward movement of the guide bar 15. And reverse sensing sensors 23 and 24 are provided.

Here, the air cylinder 21 may be controlled by the PLC.

The PLC is a device that integrates a process control relay, timer, counter, etc. into a microprocessor, and can be said to be the core of factory automation (FA). Sequence control is possible through programming, and arithmetic, logic, arithmetic, control, and data processing can be executed.

The general configuration of the PLC includes a processor (memory and central processing unit) capable of storing and processing a sequence program, an input / output device, a power supply device, an external peripheral device, a communication device capable of transmitting data to another PLC or computer, and the like. It consists of internal executable software that controls all operations.

Factory automation equipment is used throughout the industry by using PLC, and is also used as a means to enhance industrial competitiveness in automobile assembly plants and parts assembly plants.

The PLC stores each of the PLC I / O numbers (not shown) corresponding to the plurality of forward and backward sensors 23 and 24 and the blank discharge detection sensors in a data register inside the PLC to store each guide bar 15. A control signal is sent to the solenoid valves 29 moving forward and backward.

The PLC includes an input unit for processing the input signals of the various sensors arranged above, a power supply unit for providing different voltages to the PLC circuit, a central processing unit (CPU), and an interface to the central processing unit and having various control functions. It consists of a microcomputer circuit part and an output part for transmitting an output signal to a plurality of air cylinder 21 and the sole valve 29 to provide the air pressure used for driving the guide bar (15).

First, the input unit converts and transmits various input signals (ON / OFF, ANALOG) handled by various sensors to signals that can be processed by the central processing unit, and directly uses signals transmitted from various sensors as internal signals of the PLC. As a matter of course, it includes a signal conversion circuit, a noise canceling circuit, and an isolation circuit between the sensor signal and the PLC internal signal.

In addition, the output unit serves to transmit the output instruction of the program for the forward and backward movement of the guide bar 15 by the central processing unit and the microcomputer circuit unit to the control object (air cylinder 21, solenoid valves 29).

The power supply unit is adapted to supply different power sources for the central processing unit of the PLC circuit and various circuits.

The central processing unit is connected to the memory unit and the microcomputer circuit unit having the system for storing the guide bar 15 forward and backward and having a system ROM.

The PLC also has a remote input / output, data highway, LAN interface, and computer interface for communication with other PLCs. In addition, the PLC may further include a programming device and other peripheral devices for input / modification / maintenance of the PLC control logic.

Referring to the operation state and control method of the auxiliary device for discharging the double blank 14 according to the present invention by such a configuration as follows.

4 to 7 are cross-sectional views illustrating a method for discharging a blank according to the apparatus for discharging the double blank of FIG. 2, and FIG. 9 is a flowchart illustrating a control method of the apparatus for discharging the double blank in FIG. 2.

First, the operator turns on the power switch (POWER S / W) of the factory automation equipment for double blank discharge. Each cylinder 21 and solenoid valves 29 are aligned to their original positions by the PLC, and default values preset by the user are set.

When the blank 26 discharge condition is satisfied, i.e., the blank 26 attached by the vacuum cylinder is detected to be the first sheet, the last sheet and the two sheets (the detection method can be implemented by the conventional art), the defective blank It is determined that 26 has occurred, and the PLC detects this by sending a control signal to the reversing solenoid valve 29 to move the connecting bracket 18 and the moving frame 17 as the air cylinder 21 operates in the reverse direction. Guide bars 15 connected through the reverse to discharge the blank (26).

When the guide bar 15 is discharged, the reverse detection sensor 23 detects this, and the PLC which receives a signal from the reverse detection sensor reversely rotates the magnetic belt conveyor 13 to attach the blank to the magnetic belt conveyor 13. The 26 is supported by the guide bar 15 to minimize the deflection to be discharged to the double blank box 12.

At this time, when the double blank discharge detection sensor (proximity sensor) installed on the side of the magnetic belt conveyor 13 detects that there is no blank, it is determined that the blank is completely discharged.

Then, according to the above result, the PLC sends a control signal to the forward solenoid valve 29 to operate the air cylinder 21 in the forward direction, so that the guide bar 15 is lower inside the magnetic belt conveyor 13 (the original position). Will enter.

Here, the PLC receiving the detection signal from the forward and backward detection sensors 23 and 24 and the double blank discharge detection sensor does not perform the operation of the guide bar 15 (non-reverse backward) or the discharge of the blank 26 is not completed. If it is determined that it outputs an error message and stops the destacker to alert the operator, the device can be repaired or the blank removed to allow the line to run normally.

As such, the blank 26 is discharged while being supported by the guide bar 15 already discharged in the rearward direction of the magnetic belt conveyor 13, thereby preventing sagging due to its own weight and colliding with the previous blank. Interference can be prevented beforehand.

In addition, when the discharge of the blank 26 is not completed due to deflection of the blank 26, the operator does not have to stop the facility to manually remove the blank 26, thereby improving productivity. Since the operator does not have to remove the undischarged blank 26 directly, a safety accident can be prevented.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to these embodiments, and has been claimed by those of ordinary skill in the art to which the invention pertains. It includes all the various forms of embodiments that can be carried out without departing from the spirit.

1 is a schematic diagram illustrating a destacker system according to an embodiment of the present invention.

FIG. 2 is a perspective view of the auxiliary apparatus for discharging the double blank in FIG. 1.

3 is a perspective view showing an operating state of FIG.

4 to 7 are cross-sectional views for explaining a blank discharging method according to the auxiliary apparatus for discharging the double blank of FIG.

8 is a block diagram illustrating a control device for controlling the auxiliary apparatus for discharging the double blank of FIG. 2.

FIG. 9 is a flowchart illustrating a control method of an auxiliary device for discharging a double blank in FIG. 2.

10 is a configuration diagram illustrating a conventional destacker system.

FIG. 11 is a view illustrating the destacker system of FIG. 10 from above.

FIG. 12 is a conceptual view illustrating a method of separating a blank (blank) in the destacker system of FIG. 10.

FIG. 13 is a conceptual view illustrating a problem in blank discharge in the destacker system of FIG. 10.

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

10: destacking unit 11: crane saber

12: double blank box 13: magnetic belt conveyor

14: auxiliary device for double blank discharge

15: moving side guide bar 15 ': fixed side guide bar

16: fixed bracket 17: moving frame

18: connecting bracket 19: LM Guide

20: L bearing 21: Air cylinder

22: Cylinder fixing bracket 23: Reverse detection sensor

24: forward detection sensor 25: base plate

26: bad blank 27: stop valve

28: regulator 29: solenoid valve

30: speed controller 31: roller guide

Claims (11)

A large amount of blanks are separated one by one using a magnetic plotter, then adsorbed with a vacuum cylinder and transported through a magnetic belt conveyor to feed one blank into the press. In discharging a defective blank (hereinafter abbreviated as blank), A PLC controlling to discharge the blank outward upon detection of the blank; A guide bar which moves outwards to support the blanks in advance just before the blanks are discharged outwards by the magnetic belt conveyor to prevent sagging of the blanks; And And a driving means for forwarding or reversing the guide bar by receiving a control signal from the PLC when the blank is discharged. The method according to claim 1, The guide bar is installed at the lower end of the magnetic belt conveyor discharging the blank, the fixed side guide bar, the moving side guide bar which is moved outward in advance when the blank is discharged in pairs, characterized in that a plurality of parallel installation in the discharge direction Aid for double blank discharge. The method according to claim 2, The fixed side guide bar and the moving side guide bar is a double blank discharge aid, characterized in that installed in parallel to each other in the discharge direction at regular intervals. The method according to claim 3, The fixed side guide bar and the moving side guide bar is a double blank discharge aid, characterized in that the end is formed to be inclined downward at a predetermined angle so as to easily enter the fixed side guide bar and the moving side guide bar when the blank is discharged. The method according to claim 1, The driving means may include an LM guide and an LM bearing installed at a lower portion of the movable side guide bar such that the movable side guide bar is slidable in the discharge direction; An air cylinder for advancing or reversing the moving side guide bar; And And a forward and backward solenoid valve for transmitting air pressure to receive a control signal from a PLC when the blank is discharged so as to advance or reverse the air cylinder. The method according to any one of claims 1 to 5, The apparatus for discharging double blanks further comprising forward and backward detection sensors installed at the front and the rear in the discharge direction of the guide bar to detect the forward or backward state of the guide bar. In the method of controlling the auxiliary apparatus for discharging the double blank of claim 6, Detecting whether the blank is 2 sheets or defective; When detecting a defect or two blanks (hereinafter blank), the guide bar moves outward and waits before the blank is discharged; Conveying the blank over a guide bar by a magnetic belt conveyor; And And a step of discharging outward while the blank is supported by the guide bar, wherein the blank is prevented from sagging by the guide bar. The method according to claim 7, The guide bar is moved to the outside in advance to wait The reverse solenoid valve receives a control signal from the PLC to supply the operating pressure to the air cylinder; The air cylinder is supplied with a working pressure to move a moving side guide bar outward; And The moving side guide bar is moved to the outside, and the fixed side guide bar is fixed to the lower portion of the magnetic belt conveyor, characterized in that to prevent the deflection of the blank by being supported by the fixed side and the moving side guide bar when discharging the blank. Control method of the auxiliary apparatus for discharging double blanks. The method according to claim 8, The blank is transferred onto the guide bar by the magnetic belt conveyor A reverse detecting sensor detecting whether the moving side guide bar is retracted; And The PLC receives the detection signal from the reverse detection sensor and sends a reverse rotation operation signal to the magnetic belt conveyor, comprising the step of rotating the magnetic belt conveyor reversely. The method according to claim 9, The blank is discharged outward while being supported by the guide bar Determining whether the discharge of the blank is completed by a proximity sensor installed on one side of a magnetic belt conveyor; A forward solenoid valve receiving a control signal from a PLC and supplying an operating pressure to the air cylinder; The moving side guide bar receives the operating pressure from the air cylinder to move to the original position; And And receiving, by the PLC, the detection signal from the forward detection sensor and confirming completion of the return of the movable side guide bar. The method according to claim 10, Generating an error message when reversal of the moving side guide bar is not completed when the blank is discharged or when the discharge of the blank is not completed or when the return of the moving side guide bar is not completed; Stopping the destacker system; And A method of controlling an auxiliary apparatus for discharging double blanks, comprising the steps of an operator repairing the device.

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