KR20020018709A - Holder used control positon of electrode in electricity furnace and Method controlling down distance of electrode used the same - Google Patents

Abstract

PURPOSE: Provided is a holder for adjusting the location of an electrode in an electric furnace which automatically controls decline of the electrode so that it helps to improve workability in lowering the electrode. CONSTITUTION: The holder for adjusting the location of the electrode in the electric furnace comprises the parts of: a roll case(142) which includes a channel to cover a penetration hole; a workable cylinder(144) which is placed at one side of an arm; a movable body(146) which is connected to the workable cylinder to reciprocate with multiple slide sides formed at the front edge; a drive tool(148) which is placed at the proper place of the movable body; a rotation roll(150) which rotates forward or reverse as the operation of the drive tool; multiple movable members(160) which are touched to the electrode as the movable body reciprocates; multiple support rolls(152) which are placed in the same slide direction and angle as the rotation roll; a tap for detecting location(156) which is placed in the movable body; a detection sensor(154) which detects the tap for detecting location; a holder support roll(182) which shows the same slide direction and angle as the rotation roll; and a working member(180) which is fixed at the roll case by a hinge.

Description

Holder used control positon of electrode in electricity furnace and Method controlling down distance of electrode used the same}

The present invention relates to a holder device for adjusting the electrode position of the electric furnace and a method for controlling the electrode lowering distance using the same, in particular by attaching a holder device for adjusting the position of the electrode on the top of the electrode holder to the rotating roll and a plurality of supporting rolls in the vertical direction It relates to a holder device and an electrode lowering distance control method using the same so that the installation is inclined so that the electrode is rotated down while rotating the rotary roll to adjust the length of the electrode automatically.

In general, the furnace is a furnace for heat treatment or melting after the metal or alloy is introduced into the furnace by arc heat, resistance heat, or induction heating using electricity.

After the scrap iron is introduced into the furnace, the electrode is injected into the furnace to dissolve the scrap iron by heat generated from the electrode.

9 is a configuration diagram showing a holder device of a conventional electric furnace.

In the adjacent position of the electric furnace 2, the lifting cylinder 4 is installed to be operated by the hydraulic motor 6, and the upper arm of the lifting cylinder 4 is equipped with an electrode holder 8 mounted at its end. (arm) 10 is fixed.

The electrode 12 gripped by the electrode holder 8 and positioned on the upper portion of the electric furnace 2 is a vertical connection of three electrodes, and a high temperature arc heat is generated by a high voltage applied to the electrode 12. The scrap metal 14 injected into the electric furnace 2 is dissolved.

As described above, when the electrode holder 8 grips the electrode 12, the electrode holder 8 grips the electrode rod positioned at the top of the electrode 12. / 3 will remain.

2/3 of the remaining parts are for electrode position adjustment work.When the tip of the bottom electrode of the electrode is oxidized, the electrode holder is released and the arm is raised while the electrode is lowered. After positioning, the electrode is held by the electrode holder and used again.

Two methods of adjusting the electrode position are generally used. The first method is performed by fixing the electrode extractor to the upper end of the electrode, releasing the electrode holder, raising the arm, and holding the electrode with the electrode holder again.

This method has a problem in that it takes a lot of time to insert the electrode extractor on the top of the electrode as well as to move the crane when the sole electrode position adjustment only.

Therefore, the second method described below is commonly used.

In the second method, a small amount of electric power is injected into the electrode (200 kWH) while the scrap metal is charged into the electric furnace to form an arcing hole in the upper part of the charge. At this time, the power is cut off and the arm is visually lowered to lower the lower part of the electrode to the bottom of the arcing hole. Then, the electrode holder is released, the arm is raised to the maximum height, and the electrode is held again by the electrode holder.

This method makes the impression of the operator when lowering the electrode to the bottom of the arcing hole, but it is not easy to visually judge.If the mass scrap or heavy scrap in the electric furnace is located in the downward path of the electrode, As the lower end slides sideways, the connection between the electrodes is often broken.

In addition, even when the electrode holder is released, when the electrode descends to the arcing hole due to its own weight, the electrode is slid to the mass scrap or the heavy scrap metal, and the connection part is broken, so that the follow-up work is lengthened.

In addition, safety accidents such as burns may occur due to the high temperature of the electrode during the operation.

The present invention has been made to solve the problems described above, and an object thereof is to provide a holder device which can prevent the electrode from being damaged when the electrode is lowered by automatically adjusting the length of the electrode.

Another object of the present invention is to provide a method for controlling the distance that the electrode automatically descends to the generation depth of the arcing hole by using the arcing hole generated during the arcing operation.

1 is a configuration diagram schematically showing the overall structure of a holder device according to the present invention,

2 is a perspective view showing in detail the main configuration of the holder device according to the present invention in detail;

Figure 3 is a front view showing each roll in the center of the roll case to explain the installation state of the various rolls installed in the holder device of the present invention,

Figure 4 is a side view showing a partially cut inside the arm of the holder device according to the present invention,

5 is a perspective view illustrating in detail the linkage member of the holder device according to the present invention;

Figure 6 is a plan view showing for explaining the operation of the holder device related to the present invention,

7 is a plan view showing for explaining the operation after the holder device according to the present invention;

8 is a flowchart showing a step-by-step method of controlling a falling distance of an electrode using a holder device according to the present invention;

9 is a block diagram showing a holder device of a conventional electric furnace.

<< Explanation of symbols for main part of drawing >>

100 ... holder 110 ... lowering cylinder

114 ... arm 114a ... holder cylinder

120 ... electrode holder 140 ... position holder

160 ... movable member 180 ... interlock member

200 ... electrically 202 ... electrode

In order to achieve the above object, the device of the present invention, a roll case is formed at the end of the arm and the through hole through which the electrode can be inserted in the center is formed and the channel surrounding the through hole is formed therein, and A movable cylinder installed on one side of the arm, a movable body disposed inside the roll case and connected to the movable cylinder to reciprocate and having a plurality of inclined surfaces formed at a tip thereof, and a drive installed in place of the movable body; Means and fixed to the movable body and at the same time disposed inside the roll case and connected to the main shaft of the drive means is installed to be rotatable in the forward and reverse direction in accordance with the operation of the drive means, but inclined at a predetermined angle with respect to the vertical direction As long as it is installed and has a rotating roll having a friction part on the outer circumferential surface and the right place is hinged and installed at a predetermined angle One end is disposed close to the inclined surface of the movable body, the other end is in contact with the electrode in accordance with the reciprocating movement of the movable body, and rotatably installed on the other end of the movable member, A support roll installed in the same direction as the inclination direction and the inclination angle; A position detecting tab installed on the movable body; A detection sensor installed at an appropriate position of the roll case to detect the position detecting tab; A holder support roll equal to the inclination direction and the inclination angle of the rotation roll; And

The holder support roll is installed at one end and the other end is installed in place of the electrode holder, the middle portion is composed of a linking member hinged to the roll case.

In this configuration, it is preferable to further include a sensing sensor installed in place of the roll case, and a position sensing tab installed in the movable body.

And, the holder support roll and the holder support roll which is the same as the inclination direction and the inclination angle of the rotary roll, the holder support roll is installed at one end and the other end is installed in place of the electrode holder and the middle portion is hinged fixed to the roll case of the holder cylinder It is preferable that the interlocking member is interlocked according to the operation.

In addition, the interlocking member is installed in the connection plate fixed in place of the electrode holder, and the roll case which is a position opposite to the rotary roll is installed to be reciprocating relative to the through hole and the holder is supported at one end It is preferable that the support is provided with a roll, and one end is hinged to the connecting plate and at the same time the hinge is fixed in place of the roll case, the other end is preferably made of a holder side connecting rod hinged to the other end of the support.

In particular, the plurality of movable members are in contact with the inclined surface of the movable body, one end of the support roll connecting rod is hinged fixed, and the elastically supported one end is in close proximity to the other end of the support roll connecting rod and the middle place is hinge fixed It is preferable that the other end is made of a support roll fixing plate is installed on the support roll.

A method for achieving another object of the present invention is an electrode of an electric furnace for lifting the electrode up and down by using the electrode holder, elevating cylinder, driving means, rotary rolls, a plurality of support rolls and holder support rolls, etc. In the method for adjusting the position, Comprising the step of calculating and setting the lifting movement distance of the electrode supported by the rotary roll, the plurality of support rolls and the holder support roll according to the rotational speed of the drive means; Lowering the electrode into the electric furnace while the electrode is held by the electrode holder and supplying electric power to the electrode to form an arcing hole; Disconnecting power when the arcing hole is formed; Raising the electrode to a first height for a few seconds using the elevating cylinder while the power is cut off; At the same time as the rising of the electrode stops, the electrode holder is released and the driving means is operated to lower the electrode to a desired position, thereby lowering the electrode to a second height.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 schematically shows the overall structure of a holder device according to the present invention.

As shown in FIG. 1, the holder device 100 of the present invention is installed at an adjacent position of the electric furnace 200 filled with a mass scrap or scrap metal.

The holder device 100 has an elevating cylinder 110 which is perpendicular to the ground, an arm 114 connected to the piston rod 112 of the elevating cylinder 110, and a tip of the arm 114. And an electrode holder 120 provided to hold the electrode 202 and a positioning holder 140 provided at the tip of the arm 114 that is the upper portion of the electrode holder 120.

In addition, the hydraulic motor 204 and the control valve 206 for controlling the hydraulic supply to the elevating cylinder 110, the switch 208, the converter 210 and the power input desk 212 for power supply and control are provided. Is added.

Here, the positioning holder 140 and the electrode holder 120 may be referred to as features of the present invention. In more detail, as shown in FIG. 2, the positioning holder 140 and the electrode holder 120 are It is located at the tip of the arm 114.

The position adjusting holder 140 includes a roll case 142, a movable cylinder 144, a movable body 146, a driving means 148, a rotary roll 150, a plurality of support rolls 152, and a plurality of movable members ( 160), and will be described in detail for each component.

The roll case 142 is installed at the end of the arm 114, and a through hole 142a through which the electrode 202 can be inserted is formed at the center thereof, and a channel 142b surrounding the through hole 142a is formed therein. It is formed in a tunnel form.

In addition, a plurality of roll access doors 142c are formed on the inner surface of the roll case 142 facing the through hole 142a, but preferably four doors are formed at equal intervals, and are installed in a hinged manner. Is made so that the roll out of the rolls to be described later smoothly.

In addition, a movable body guide 142d having an upper surface and one side surface thereof is formed in the arm side portion of the roll case 142. In place of the movable body guide 142d, a sensor 154 is installed and associated with the operation of the electrode holder 120 in association with the position sensing tab 156 described later.

The movable cylinder 144 is provided on the upper surface of the arm 114, and the piston rod direction of the movable cylinder 144 is provided toward the movable body guide 142d.

The piston 144a of the movable cylinder 144 is provided with a movable body 146. The movable body 146 is installed inside the roll case 142, and more preferably, is installed inside the movable body guide 142d, and the driving means 148 is disposed on the upper surface of the movable body 146 in place. A motor capable of forward and reverse rotation is installed.

In particular, on one side of the movable body 146, which is a position opposite to the piston rod 144a of the movable cylinder 144, a bracket 146a for fixing the rotary roll 150 is formed to be inclined with respect to the vertical direction, and also movable On one side of the sieve 146, a plurality of inclined surfaces 146b are formed with the bracket 146a interposed therebetween.

In addition, the upper surface of the movable body 146 is provided with a position sensing tab 156 corresponding to the above-described sensor 154.

On the other hand, the main shaft of the motor 148 penetrates the movable body 146 and is positioned inside the movable body 146, and a driving sprocket 148a is installed at the end of the main shaft. The drive sprocket 148a and the rotary roll 150 are connected by a belt 148b.

The rotary roll 150 is connected to the motor 148 and the belt 148b so that the rotary roll 150 can rotate in the forward and reverse directions according to the operation of the motor 148 and is installed in the bracket 146a as shown in FIG. It is installed at an inclined angle.

In particular, the outer peripheral surface of the rotary roll 150, the friction portion is formed, preferably the tooth (150a) is formed.

At both adjacent positions of the rotary roll 150, a plurality of movable members 160 are installed to interlock with the inclined surface 146b of the movable body 146.

In particular, the plurality of movable members 160 is in contact with the inclined surface 146b of the movable body 146, the support roll connecting rod 162 is hinged in the middle place, and one end is elastically supported is connected to the support roll It is preferable that the support roll fixing plate 164 is close to the other end of the rod 162, the middle position is hinged and the support roll 152 is installed on the other end.

Here, the support roll 152 is also provided with the same inclination direction and inclination angle as the rotary roll 150 described above.

Meanwhile, as shown in FIG. 4, a holder cylinder 114a for operating the electrode holder 120 is installed inside the arm 114. The piston rod 114b of the holder cylinder 114a is elastically supported by the spring 114c to automatically return to its original position after the piston rod 114b is operated by hydraulic pressure.

When the electrode holder 120 installed at the end of the piston rod 114b is pushed by the operation of the holder cylinder 114a, the operation of holding the electrode 202 is released, and on the contrary, the restoring force of the spring 114c and the holder When the cylinder 114a returns to its original position by the return operation, the electrode 202 is gripped.

The interlocking member 180 is installed in place of the electrode holder 120 as shown in FIG. 5, and one end of the interlocking member 180 has the same holder support roll as the inclination direction and the inclination angle of the rotation roll 150. 182 is installed, and the other end is fixed in place of the electrode holder 120.

In more detail, the interlocking member 180 is installed in the connection plate 184 fixed in place of the electrode holder 120 and the roll case 142 which is a position opposite to the rotary roll 150. And a support 186 on which the holder supporting roll 182 is installed at one end thereof and one end thereof is hinged to the connecting plate 184 at the same time. 142 is hinged in place and the other end is made of a holder side connecting rod 188 hinged to the other end of the support 186.

Referring to the operation and effect according to the present invention configured as described above are as follows.

As shown in FIG. 6, the electrode 202 is initially inserted through the through hole 142a of the roll case 142 and is held by the electrode holder 120.

Subsequently, as shown in FIG. 7, when the movable cylinder 144 is operated, the rotary roll moves the movable body 146 toward the through hole 142a while the piston rod 144a is pulled out. ) Is in close contact with the outer circumferential surface of the electrode 202.

At the same time, the support roll connecting rod 162 having one end close to the inclined surface 146b of the movable body 146 is pushed by the inclined surface 146b and rotated about the hinge so that the other end of the supporting roll connecting rod 162 is supported. As one end of the fixing plate 164 is pressed, the supporting roll fixing plate 164 rotates around the hinge so that the supporting roll 152 pushes the roll access door 142c to closely contact the outer circumferential surface of the electrode 202. .

At this time, as soon as the rotary roll 150 and the support roll 152 are in close contact with the electrode 202, the advancement of the movable body 146 is terminated and the detection sensor 154 detects the position detecting tab 156. At the same time, the holder cylinder 114a is operated to release the electrode holder 120 holding the electrode 202.

The release of the electrode holder 120 means that the electrode holder 120 moves away from the through hole 142a. As a result, the connecting plate 184 together with the electrode holder 120 also moves away from the through hole 142a and the holder side. The connecting rod 188 is rotated about the hinge to allow the support 186 to approach the through hole 142a, and the holder support roll 182 installed in the support 186 pushes the roll access door 142c to reassemble the rod. In close contact with the electrode 202.

In summary, the electrode holder 120 holding the electrode 202 is in a released state, and the rotary roll 150, the plurality of support rolls 152, and the holder support roll 182 are attached to the electrodes. It is in close contact.

When the motor 148 is rotated in this state, the driving force of the motor 148 is transmitted to the rotary roll 150 through the belt 148b. The rotary roll 150 and the plurality of support rolls, which are one of the characteristics of the present invention, are provided. Since the 152 and the holder supporting roll 182 are installed to be inclined, the teeth 150a are formed on the outer circumferential surface of the rotary roll 150 so that the electrode 202 is lowered while rotating as shown in FIG. 4. At this time, if the falling distance of the electrode 202 according to the rotational speed of the motor 148 is calculated in advance, the electrode 202 can be lowered by the desired falling distance.

Therefore, the lowering of the electrode 202 prevents the electrode from colliding with the mass scrap or heavy scrap metal 203 while being damaged.

The falling distance of the electrode can be controlled using the apparatus as described above, which is shown in sequence in the flowchart of FIG. 8.

First, the setting step 300 calculates and sets the moving distance of the electrode supported by the rotation roll, the plurality of support rolls, and the holder support roll according to the rotational speed of the motor, and sets it in the controller.

After the setting step 300, the arcing hole forming step 400, the electrode is lowered to the inside of the electric furnace while the electrode is held in the electrode holder and then supplying about 200kwH to the electrode to form the arcing hole.

Subsequently, when the formation of the arcing hole is completed, the power is cut (500).

After the power is cut off, the electrode raising step 600 raises the electrode to the first height for several seconds using the elevating cylinder at the same time as the power is cut off, and preferably raises it by 960 mm for 8 seconds. In other words, the ascending speed of the arm by the elevating cylinder is 120 mm / sec.

Finally, the electrode lowering step 700 stops the rising of the electrode and releases the electrode holder while operating the driving means to lower the electrode to the desired position to lower the electrode to the second height. At this time, if the rotation by the desired time at the rotational speed of the motor input in the setting step 300, the electrode can be lowered to the second height of the desired height.

As described above, the embodiment of the present invention substantially solves the conventional problems.

That is, since the falling distance of the electrode can be adjusted by using a motor in the process of lowering the electrode into the electric furnace, breakage of the electrode generated when the electrode is lowered can be prevented.

In addition, it is possible to automatically control the lowering of the electrode can be confirmed by the naked eye to eliminate the inconvenience of inducing the lowering of the electrode to improve the work convenience.

In addition, it is possible to prevent the breakage of the electrode in advance, it is possible to prevent the safety accident due to the high temperature electrode during the operation.

Claims (4)

A holder device for adjusting the position of an electrode in an electric furnace, which is lifted up and down by holding an arm that is lifted up and down by a lifting cylinder and an electrode holder operated by a holder cylinder provided on the arm, while holding an electrode for scrap metal melting. A roll case installed at an end of the arm and having a through hole through which the electrode can be inserted in a central portion thereof, and a channel surrounding the through hole formed therein; A movable cylinder installed at one side of the arm; A movable body disposed inside the roll case and connected to the movable cylinder to reciprocate and having a plurality of inclined surfaces formed at a tip thereof; Drive means installed in place of the movable body; It is fixed to the movable body and is disposed inside the roll case and is connected to the main shaft of the driving means and is rotatably installed in the forward and reverse directions according to the operation of the driving means, and is installed at an angle with respect to the vertical direction. Rotating roll having a friction portion on the outer peripheral surface; A plurality of movable members having hinges fixed in place and installed at a predetermined angle, while one end is disposed close to the inclined surface of the movable body and the other end contacts the electrode according to the reciprocating movement of the movable body; A plurality of support rolls rotatably installed at the other end of the movable member and installed in the same direction as the inclination direction and the inclination angle of the rotary roll; A position detecting tab installed on the movable body; A detection sensor installed at an appropriate position of the roll case to detect the position detecting tab; A holder support roll equal to the inclination direction and the inclination angle of the rotation roll; And The holder support roll is installed at one end and the other end is installed in place of the electrode holder, the middle portion is made to include a linking member hinged to the roll case, When the movable body is in operation and the sensing sensor detects the position detecting tab, the interlocking member is interlocked so that the rotating roll, the plurality of supporting rolls and the holder supporting roll contact the electrode. And the electrode is lowered by the driving means after contacting. The method of claim 1, wherein the linkage member, A connecting plate fixed in place of the electrode holder; A support installed in the roll case opposite to the rotary roll to be reciprocally installed with respect to the through hole, and having the holder support roll installed at one end thereof; And One end hinged to the connecting plate and at the same time the hinge is fixed in place of the roll case, the other end of the holder device for adjusting the electrode position of the electric furnace comprising a holder side connecting rod hinged to the other end of the support. The method of claim 1 or 2, wherein the plurality of movable members, A support roll connecting rod having one end in contact with an inclined surface of the movable body and having an intermediate position hinged; And The holder of the electrode for adjusting the position of the electric furnace, characterized in that the one end is elastically supported close to the other end of the support roll connecting rod, the middle position is hinged, the support roll fixing plate is installed on the other end. In the method of adjusting the position of the electrode in the electric furnace to raise and lower the electrode into the electric furnace by using an electrode holder, a lifting cylinder, a driving means, a rotary roll, a plurality of support rolls and a holder support roll, Calculating and setting a moving distance of the electrode supported by the rotating roll, the plurality of supporting rolls, and the holder supporting roll according to the rotational speed of the driving means; Forming an arcing hole by lowering the electrode into the electric furnace while the electrode is held by the electrode holder and supplying electric power to the electrode; Disconnecting power when the arcing hole is formed; Raising power to the first height for a few seconds by using the elevating cylinder while the power is cut off; And At the same time as the rise of the electrode stops, the electrode holder is released, and the driving means is operated to lower the electrode to a desired position, thereby lowering the electrode to a second height. Electrode descent distance control method.