KR900010332Y1 - Device for transfer the lance of the electric furnace for steel making - Google Patents

Abstract

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Description

Lance feeder for steelmaking furnace

1 to 5 are explanatory views of the lance transfer device of the steelmaking electric furnace of the present invention, Figure 1 is a configuration of the main portion of the lance transfer device.

2 is a schematic overall view of the lance feeder.

3 is a state in which the upper roller support is separated from the lower roller support.

4 is a state diagram showing the bowing inclined position when the seam is directly below the upper roller.

5 is a state diagram when the joint is on the lower roller that is elastically supported.

6 and 7 are explanatory views of the lance transfer apparatus of the steelmaking electric furnace in the prior art, and FIG. 6 is a schematic diagram of the lance transfer apparatus.

7 is an explanatory view of the transfer operation of the lance.

* Explanation of symbols for main parts of the drawings

1: transfer device of lance 2: electric furnace

2a: dregs outlet 3: lance

4, 4A, 4B, 4C, 4D, 4a, 4b: upward roller

5, 5A, 5B, 5C, 5D: Down roller

6: molten steel 7: upper roller support

7A: Flat support structure 7B: Bow structure

8: lower roller support 9: hydraulic cylinder

10: support point 11: the balance

12: Orbit 13: Sprocket

14: chain 15: motor

16: drive sprocket 17: spring

18: rocking arm 19: support

20: Rod 20a: Fall prevention body

21: space 22: seam

23, 23A, 23B: bow 23a: support base

24: column 25, 25A, 25B: rod-shaped lever

26: hanging mechanism 27, 27a: pressure spring

28: fall prevention mechanism 29: spring box

30: bolt 31: rocking lever

32: bracket 33: rod

34: connection rod 35: screw jack

36: handle 37: discharge cover

38: arrow

The present invention relates to a transfer device of a lance to an electric furnace for steelmaking, and in particular, a long lance in which the front end is consumed while oxygen or carbon powder is blown into the molten steel in the electric furnace is sequentially transferred toward the molten steel. It relates to a device to.

Conventionally, the charged scraps and the like of steelmaking electric furnace are convulsed by the electric spark generated from the electrode, during which the decarburization, the temperature rise, and further, in order to cut a large part of the charged scraps, oxygen is cut. Will be blown.

Moreover, carbon powder is also supplied as needed in order to reduce iron oxide in a coal burnt and a molten material.

Oxygen alone, the carbon powder is blown with the air it carries, using a lance made of a long iron pipe with a special ceramic treatment on the inside and outside.

In the electric furnace, a dregs outlet is usually formed at the side of the furnace body. During refining, for example, a lance having a diameter of 30 mm and a length of 5 m is inserted into the molten steel from the dregs outlet.

The lance melts and damages the front end during the ejection of oxygen or carbon powder, so it is necessary to reinsert the amount of the spent length.

In the case of doing this by hand, heavy labor under high heat is strongly enforced to the worker, and therefore, a conveying means such as a hydraulic cylinder or an air cylinder is employed.

However, there is a limit to the amount of extension of the cylinder, so that a short lance must also be replaced or added frequently.

In addition, it is necessary to fix the lens manually by hand and stop working on it and infusing it.

For this reason, in recent years, the transfer apparatus of the lance which connects a lance in advance and makes it long, is pinched by the pinch roller, and conveys it is employ | adopted.

According to this, by pressing the lance as the upper roller moving along, driving the lower roller on which the lance is placed, the lance is transferred into the waste outlet, and the upper roller support and the lower roller support are tilted at the same time so that the lance is inserted. It is possible to change the posture.

According to the method of conveying as a roller, it is not limited by the amount to be conveyed, the frequency of fixing by hand is small, and when it is necessary to fix by hand, the work can be performed very easily. You can do the work which you inject.

However, the above-mentioned transfer device of the lance to the steelmaking electric furnace of the related art has the following problems.

One lance is one long, for example, 5 m long, and the front and rear ends of the two lances are connected to each other by seams.

Caulking the fittings makes it easy to connect the lances, but since the fittings are laid as if they surround the front end of the lances, the joints are probably larger than the diameter of the lances.

Therefore, when the lance is clamped and transported as a pinch roller, it is impeded that the joint portion passes through the roller.

Therefore, as shown in FIG. 6, there are some which are elastically supported so that upper rollers 4a and 4b may each independently displace up and down.

According to this, even when the lower roller 5 driven to convey the lance 3 cannot be displaced as the joint portion 22 passes through each roller, any one of the upper rollers 4 is provided. Avoiding upwards allows the seam 22 to pass through.

Of course, the lance 3 is pushed by the lower roller 5 to receive the conveyed force, and is moved in the direction of the desired arrow 38.

The force by which the lance 3 pushes the lower roller 5 by means of the above upper roller 4 is required to be as uniform as possible.

The reason for this is that since the conveyance is promoted by the lower roller, if the lower roller 5 and the lance 3 are not in close contact, the lance 3 cannot be conveyed at a desired speed.

As shown in FIG. 7, when the seam 22 is above the lower roller 5, for example, above the 5A, the upper roller 4a positioned near the upper portion greatly rises, The upper roller 4b does not rise or rises only slightly.

The pushing force of the lance 3 with the upper roller 4 to the lower roller 5 is proportional to the amount of contraction of the pressing spring 27a, so that the pushing force of the upper roller 4a is the upper roller 4b. It becomes larger than the force of, so that the lance 3 cannot be pushed by the lower roller 5 with an even force.

If the contact friction force between the lower roller 5 and the lance 3 is different, the movement of the lance 3 will not be smooth and sufficient thrust force will not be obtained.

Therefore, there is a problem that a situation occurs in which the lance does not move at such a speed even when controlled at a desired feed rate, and an obstacle occurs in an operation for blowing oxygen.

In addition, since the elastic force of the pressure spring 27a in the vicinity of the joint portion is strong when the joint portion reaches the roller, a large conveying force is required to pass the joint portion, and the auxiliary work such as pushing the lance is necessary, Workers must not be deployed.

In addition, in order to increase the driving force of the lower roller or to enlarge the contact surface between the roller and the lance, the roller must be made large, resulting in problems such as an increase in the size of the apparatus and an increase in manufacturing cost.

The present invention has been made to solve the above problems, and its purpose is to push forward the long and thin lances with a joint evenly with the upper roller without involving the apparatus and the enlargement, and to reliably promote the transport by the lower roller. It is to provide a conveying device of the steel lance for the steel steel to be able to exert a sufficient propulsion force.

Referring to Fig. 1, the features of the transfer device for the lance of the steelmaking electric furnace according to the present invention are fitted with the lances 3 of the plurality of rollers disposed above and below, and the lower rollers 5 are supported. The lance 3 is conveyed by driving, and the upper roller support is a conveying device of the lance which is capable of changing the posture of the lance 3 by moving the upper roller support 7 and the lower roller support 8 to incline. (7) has a flat support structure (7A) and a bow structure (7B), the upper roller (4) is supported as a bow type, the bow structure having two pairs of bows (23) 7B is laid down so that posture can be changed freely on 7A of top support structures, and the press spring 27 is attached to the upper part of the center of the top support structure 7A, and the bow structure 7B is provided. A) the lower roller support A force is applied toward (8), and the pivot support structure 7A is supported and supported by a rotatable swing lever 31, and the swing lever 31 is disposed in an approximately horizontal position, with its ends It is connected to the additional bow structure 7B so that rotation is possible.

When the joint 22, which is thicker than the diameter of the lance, comes directly under one upper roller for connecting the lance 3, one roller supported by the bow type is loaded on the joint 22. The other side is in a state deviated from the joint portion 22.

At this time, the bow 23 is inclined, the support bearing point of the bow 23 does not rise only half of the height to the bearing point of the upper roller (4) raised by the joint portion (22).

As a result, the increase in the pushing force by the pressure spring 27 is reduced, and any of the upper rollers 4 is equally applied to the lance 3 with the same pushing force as before. .

At that time, the swing lever 31 installed on the planar support structure 7A supports moving in the direction in which the bow structure 7B is conveyed.

Then, the swing lever 31 is capable of circular motions, the downward movement of the bow structure 7B for pushing the lance 3 to the lower roller 5, and the joint 22 is the upper roller. The passage of the lance 3 is maintained by allowing the bow structure 7B to move inclined when passing through one of (5).

The upper roller is supported as a bow type, and a bow structure having two pairs of bows is laid down so that the posture can be changed freely on the flat support structure, and is placed on the upper portion of the center of the flat support structure. Since the pressure spring is equipped and the bow structure is exerted toward the lower roller support, when the seam is positioned on the upper roller, the upper roller is displaced to take advantage of passing through the seam and at the same time by the entire upper roller. The force for pushing the lance is equalized, and the transfer of the lance by the lower roller is assured.

Therefore, the lance can improve the propulsion force necessary to feed and feed the molten steel, and even if it is necessary to control the feed speed precisely, smooth the desired work such as blowing the oxygen to give the lance the speed. Can be planned.

In addition, the swing lever supported and supported so as to be able to rotate to the flat support structure is connected to the bow structure while maintaining a substantially horizontal posture, which allows the bow structure to move to tilt when the seam passes through the roller. At the same time, it is supported as a simple structure that the bow structure moves in the direction of movement of the lance with respect to the planar support structure.

EXAMPLE

Referring to the accompanying drawings, an embodiment of a lance transfer apparatus for steel re-electric furnace according to the present invention in detail as follows.

2 is a state in which the lance 3 is transported and put into the electric furnace 2 by the transfer device 1 of the lance, and is lanced in a plurality of rollers 4 and 5 arranged above and below. (3) is fitted and the lower roller (5) is driven so that the lance (3) is transferred to the molten steel (6) through the dregs outlet (2a) of the electric furnace (2).

Although the above upper roller 4 and the lower roller 5 are supported by the upper roller support 7 and the lower roller support 8, respectively, and are not shown in detail, the hydraulic cylinder 9 is operated. The upper roller support 7 and the lower roller support 8 can be integrally formed so as to be tilted as shown by an imaginary line with a part about the support point 10.

The tilting angle can be up to about 20 degrees, and the position of the front end of the lance 3 can be easily changed in the case of cutting the scrap.

The conveying device 1 of such a lance is mounted on the trolley 11, and it is accessible from the electric furnace 2 along the track | orbit 12, and is accessible to the waste outlet 2a.

FIG. 1 is a view of the main part of the transfer device of the lance of the present invention, in which a sprocket 13 is installed in each of the lower rollers 5, and the chain 14 is hung through an idler wheel or a tensioner.

Rotation of the motor 15 is transmitted from the drive sprocket 16 to each sprocket 13, so that the lower roller 5 which propels the transfer directly to the lance 3 is driven in a desired direction.

The lower roller 5 is in the shape of a django to hold the lance 3 of the circular cross section together with the upper roller 4, and each of them is supported by a side stand not shown.

In addition, the sprocket 13 mentioned above is integrated with the side part of the lower roller 5, and does not prevent the lance 3 from passing.

Although four such lower rollers 5 are shown in drawing, the number is arbitrarily selected, and three or more are normally provided.

All or part of the lower roller 5 is elastically supported in the up and down direction by the spring 17.

In this example, two rollers 5B and 5C in the center of the four lower rollers 5 are supported by the swinging arm 18, and one end of the swinging arm 18 is supported by the support 19. It is installed so that it may rotate freely, and the coil-shaped spring 17 is interposed below the other end with the upper surface of the lower roller support body 8.

The spring 17 is fitted outside the rod 20 suspended from the swinging arm 18, and the lower end of the rod 20 protrudes into the space 21 formed in the lower roller support 8. The lower roller 5 is regulated so as not to rise excessively by the fall prevention body 20a.

On the other hand, the supporting points of the lower rollers 5A and 5D are not moved.

According to the lower roller 5 provided in this way, when the joint part 22 of the lance 3 passes through the lower roller 5B or 5C, the lower roller will go down, and the lower roller 5A or When passing through 5D, the lower rollers 5B and 5C rise to contact the lower surface of the lance 3 which is slightly lifted up.

Therefore, the drive for conveying the lance 3 can always be performed by the support of the four lower rollers 5.

On the upper side of the lower roller support 8 described above, a moving upper roller 4 for supporting the lance 3 is supported, and when passing through the lances 4A to 4D and the lower roller 5D, The upward roller 4 located near the seam 22 is adapted to displace upward to allow the seam 22 to pass.

Therefore, the upper roller 4 is supported in a bow form, and two pairs of bows 23 are mounted on the bow structure 7B.

In more detail, the upper roller support 7 has a planar support structure 7A and a bow structure 7B, and the planar support structure 7A has a column standing at the front and rear ends of the lower roller support 8. 24 is installed to enable the operation up and down in the direction away from the lower roller support 8 via the lever-shaped lever 25.

7 A of horizontal support structures are laid down so that the bow structure 7B may change a posture freely via the hanging mechanism 26, and one is provided in the upper part of the center of the bow structure 7B. Or more pressure springs 27 are provided so that the bow structure 7B is forced downward by the pressure springs.

As shown, the upper rollers 4A and 4B are supported by one bow, and the upper rollers 4C and 4D are supported by different bows, and these two pairs of bows 23 are supported. It is provided in the bow structure 7B.

As a result, this roller 4 is applied to the whole by one pressurizing spring 27, and equalizes the pushing force acting on each upper roller rather than the case where a pressurizing spring is equipped for every upper roller. You can do it.

In addition, a fall prevention mechanism 28 is provided at the lower end of the bow structure 7B so that the upper roller 4 is not inclined too much, and the pressure spring 27 is a spring formed in the planar support structure 7A. It is built in the box 29, and it can adjust the force which descends as the bolt 30. As shown in FIG.

The swing lever 31 is mounted on the upper roller support 7 such that the bow structure 7B does not shift in the direction in which the lance 3 moves.

The reason for this is that the bowing structure 7B cannot be displaced entirely in order to push the lance 3, and when the seam 22 passes through one of the upper rollers 4, The rollers must be tilted to allow only the rollers to be displaced upwards, because the bow structure 7B simply hangs down as the hanging mechanism 26.

As described later, the planar support structure 7A is capable of fixing its position, but the swinging lever 31 which prevents the bow structure 7B from shifting therefrom rotates to the planar support structure 7A. It is supported so that it can be supported, and the end part of the direction which conveys the lance is installed in the bracket 32 which runs down from the bow structure 7B, maintaining a substantially horizontal posture.

In addition, the swinging lever 31 may be installed on the bow structure 7B at the rear end, as opposed to the drawing.

In that case, it is preferable that the support supporting point on the side of the bowing structure 7B is the same as or higher than the support supporting point on the flat support structure 7A.

Then, in order to smoothly release or hold the lance 3 held by the upper roller 4 and the lower roller 5 from the transfer device of the lance, the upper roller support 7 is supported by the lower supporter. It is structured to be separated from (8).

That is, as shown in FIG. 3, when the above-mentioned sliding lever 25 is rocked, the planar support structure 7A is displaced upward.

This is equal to the distance between the support base points in the column 24 of the two rod-shaped levers 25 and the length of the flat support structure 7A, and the postures of both rod-shaped levers 25 are the same. Since a parallelogram link is formed, the planar support structure 7A is displaced into a sieve maintaining a posture parallel to the lower roller support 8.

However, since the lifetime quadrilateral has a very low shape, even if one end of the rod-shaped lever 25A is pivoted with a rod 33, the planar support structure 7A is a rod-shaped lever ( Only the 25A) side is raised and is not displaced parallel to the lower roller support 8.

In order to assist it, a connecting rod 34 of the same length as the flat support structure 7A is again connected between the other end of the rod-shaped lever 25 on both sides, so that the center portion is connected to the column 24. The lower side of the slide-shaped lever 25 that is supported and supported forms a tall parallelogram link to ensure that the planar support structure 7A moves.

In addition, the rotation of the rod-shaped lever 25, that is, the operation of pushing and pulling the connecting rod 34 is performed by the screw jack 35 supported to allow the column 24 to swing.

When the handle 36 is turned, the rod 33 moves forward or backward while the dustproof cover 37 is expanded and contracted through the worm gear and the like built in the gear box.

Of course, if the screw jack 35 is restrained, the planar support structure 7A can be fixed at a desired position.

Referring to the operation of the lance feeder for the re-steel furnace with such a configuration as follows.

In the fitting of the lance 3 toward the electric furnace 2, the posture of the lance is tilted, but is horizontally indicated in the drawing used for explanation.

The lance 3, which is connected by a fitting and has a long length, is fitted by a conveying device of the lance, and the conveying is operated by the driving of the lower roller 5, and the upper roller 4 falls out of the lance 3. Press the lance 3 above to prevent it.

In the lance 3, for example, oxygen can be flowed at a pressure of 8 kg / cm 2 to increase the temperature of molten steel and decarburize.

In such a case, the front end immersed in the molten steel melts and is damaged by heat, so that the lance 3 is transported and put at a speed of, for example, about 50 mm / minute.

The operation of holding the lance 3 to the transfer device of the lance pushes the rod 33 by turning the handle 36 of the screw jack 35 as shown in FIG.

The connecting rod 34 is moved in the direction of the arrow 38 by the rotation of the rod-shaped lever 25A, and the other rod-shaped lever 25B is also rotated.

7 A of flat support structures supported and supported by the both lever-shaped levers 25 are lifted to this side, maintaining the horizontal posture, and the bow structure 7B hanging by the hanging mechanism 26 also hangs. From the lower roller (5).

Since the upper roller 4 supported by the bow 23 is regulated by the fall prevention mechanism 28, one roller does not hang down.

When the new lance 3 is placed on the lower roller 5 in this state, the planar support structure 7A is lowered by the reversal of the screw jack 35, so that the lance 3 is the upper roller 4 And by the lower roller (5).

Then, the upper roller support 7 and the lower roller support 8 are tilted and moved at a desired angle as a hydraulic cylinder or the like not shown together.

The lower roller 5 is rotated by the driving of the motor 15 so that the lance 3 is fitted into the molten steel from the dregs outlet.

As the front end is consumed, the lance 3 is transported, and when the seam 22 comes under the upper roller 4, the bow 23 is inclined.

4 is an example in which there is a joint 22 under the upper roller 4C, and the supporting support point 23a of the bow 23B rises only half of the upper roller 4C.

Therefore, the inclination angle of the bowing structure 7B is also small, and the contraction of the pressing spring 27 is also transferable.

As a result, the pushing force is also not significantly increased, and the pushing force into the flat structure is distributed so that the lance 3 is pushed evenly.

The pushed by the upper roller 4 and the conveyed by the lower roller 5 are also performed in a state close to the case where the seam 22 is shown in FIG. 1 not carried in the lower roller 5. do.

In addition, as shown in FIG. 5, when the joint part 22 reaches the one lower roller 5C located in the center, the lower roller 5C will be displaced freely up and down, so that the joint part will be freely displaced. 22 pushes down the lower roller 5C.

Since the lance 3 is pushed by the upper roller 4, it is kept horizontal, and all the lower rollers 5 support the lance 3 to exert a predetermined conveying force.

The push-up by the upper roller 4 and the transfer by the lower roller 5 are also performed in a state close to the case where the joint portion 22 is not carried on the lower roller 5.

Moreover, when the joint part 22 comes over the lower roller 5A in which the support base part is fixed, the lance 3 will be lifted from the site | part.

In this case, the whole of the lance 3 is inclined, and each of the bows 23 is also inclined about the support base 23a as if it were following the inclination.

Also in this case, the amount of contraction of the pressing spring 27 is suppressed, and the pushing force acting on each upper roller 4 is not so large, and is equal to the whole as described above.

Incidentally, in the present embodiment, any one of the lower rollers 5 is elastically supported, and when the joint portion 22 comes, the rollers are lowered, but in the present invention, the lower rollers 5 are supported. It can be applied even when the supporting point is not moved completely like the lower roller (5A).

In the operation of the above-described bow structure 7B, the movement of the bow structure 7B in the direction of conveying the lance with respect to the flat support structure 7A is prevented by the swing lever 31.

In addition, this swing lever 31 has a lower displacement of the bow structure 7B for pushing the lance 3 and a bow when the seam 22 passes through one of the upper rollers 4. The structure 7B is allowed to move to tilt.

The swing lever 31 having such a function can operate the upper roller support 7 formed by the planar support structure 7A and the bow structure 7B as desired while still having a very simple configuration.

As described above, when the joint portion 22 moves to the extent that it becomes impossible to hold the lance through the rollers, it is exchanged for a new lance.

By operating the screw jack 35, the flat support structure 7A is raised as described above, so that the upper roller 4 and the lower roller 5 are separated from each other.

The former lance 3 is removed by shifting laterally, and the new lance is inserted in the direction of conveying the new lance from the rear side and placed on the lower roller 5.

When the flat support structure 7A is lowered, the lance is sandwiched and transferred from the dregs outlet into the molten steel in the above-described order.

Claims (1)

The lance 3 is fitted to a plurality of rollers arranged above and below, the lance 3 is transferred by driving the lower roller 5, and the upper roller support 7 and the lower roller support 8 are tilted. In the transfer apparatus of a lance which can change the attitude | position of the lance 3 by moving so that the said upper roller support body 7 has the planar support structure 7A and the bow structure 7B, The upper roller 4 of is supported as a bow type, and the bow structure 7B having two pairs of bows 23 is mounted so that the posture can be changed freely on the flat support structure 7A. The flat support structure 7A is applied to the lower roller supporter 8 by the pressure spring 27, and the pivoting lever 31 which can be rotated is supported by the flat support structure 7A. Been supported, that yo Lever 31 is disposed in a substantially horizontal attitude, the end portion bow group steelmaking lance transferring apparatus for an electric furnace, characterized in that connected to the pivoting structure (7B).