KR20010000181U - Apparatus for preventing the partial wear from lance - Google Patents

Abstract

The present invention relates to a device for preventing the local wear of the lance (LANCE), and more specifically, the wear portion of the lance main body that collides with the drop-in alloy iron that is dropped by rotating the lower portion of the lower lance main body during oxygen blowing operation The present invention relates to a lance local wear prevention device capable of preventing local wear, extending service life, and preventing eccentric oxygen injection.

The present invention is a multi-pipe structure of the dust collecting pipe 300 is installed on the top of the refining furnace (200), it is installed so as to be movable, and connected to the first, second and third pipes (101, 102, 103) In the refining facility for injecting the alloy steel 400 into the lance body 110 and the refining furnace 200, the lower rotary tube with respect to the upper fixing tube member (11a) (12a) (3a) of the lance body (110) A rotary connection portion 10 connecting the joint members 15 so as to rotate the members 11b, 12b, and 13b; and the collision position of the third lower pipe 13b that collides with the ferroalloy 40. It provides a lance local wear prevention device comprising; a rotary operation unit 20 for rotating the lower rotary tube member (11b) (12b, 13b) to vary.

Description

Lance local wear prevention device {APPARATUS FOR PREVENTING THE PARTIAL WEAR FROM LANCE}

The present invention relates to a device for preventing the local wear of the lance (LANCE), and more specifically, the wear portion of the lance main body hit the drop-in alloy iron that is dropped by rotating the lower part of the lower lance main body during oxygen blowing operation The present invention relates to a lance local wear prevention device capable of preventing local wear, extending service life, and preventing eccentric oxygen injection.

In general, the stainless refining operation is to remove the carbon removal process to oxidize the heavy carbon and impurities, and to reduce the incidentally oxidized valuable metals during the carbon oxidation process, and to dephosphorize to remove sulfur in the steel.

In the stainless steel manufacturing process, the lance 100 using a means for blowing oxygen into the steel to remove molten iron transport and impurities in the furnace during the refining operation of the molten steel, as shown in FIG. It consists of a tube form of a multi-pipe installed on the outside of the dust collecting pipe 300 is installed in. do.

That is, the lance 100 is the first pipe 101 is supplied with oxygen, and the second pipe 102 is introduced into the cooling water for cooling the lance main body 110 is heated to 1700 to 1750 ℃ during the refining operation And a third pipe 103 connected to each of the drained cooling water, and the lance main body 110 is assembled to be movable along the guide track 301 installed in the dust collecting pipe 300. It is mounted as a plurality of fixing members 303 in the.

Accordingly, since the upper end of the carriage 302 is connected to the wire of the electric wire device (not shown), the land body 110 through the hole 304 provided in the dust collecting pipe 300 to refine the furnace ( While ascending and descending to the inlet 202 of 200, oxygen is blown to the surface of the furnace molten steel to remove carbon in the molten steel. At this time, the lance 100 entered into the furnace through the inlet 202 to inject oxygen to the molten steel surface in the refining furnace 100 during molten steel refining 10 while the lower end is stopped while maintaining a 2m interval with the molten steel surface Oxygen is injected to the steel surface for about 15 seconds.

At the same time, the various kinds of alloy steel 400 to be controlled into the refining furnace 200 to control the heat of oxidation by reaction with oxygen and to constitute the chemical composition of the steel, as shown in Figure 1, the transfer conveyor 401 ) Is then dropped into the central portion of the refining furnace 200 through the hopper 402 and the chute 404.

However, as the alloy 400 is dropped into the refining furnace 200 through the chute 403 하, the lower lance main body 110 and the alloy 300 falling down collide with each other to blow oxygen into the molten steel surface. Therefore, only the local parts of the lance body 110 that are intensively hit by the end of the drop-in operation of the ferroalloy 400 are badly worn, thereby destroying the appearance of the lance body 110 made of a multi-pipe.

In this case, when the coolant leaked from the exterior of the damaged lance main body 100 is in contact with the molten steel during the oxygen reaction to explode, causing a large-scale equipment accident, the molten steel refining operation is impossible when oxygen injection is impossible due to the equipment accident such as a large explosion Of course, since the broken lance body 110 must be replaced with a new one, the refining work productivity is lowered.

In addition, the lance 100 has a service life that can be repeatedly performed about 600 times a single operation of injecting 20 tons of ferroalloy 400, but the appearance of the lance body 110 is thinned and worn at 400 times As shown by the deterioration by molten steel of high temperature in the working environment, when the oxygen is deformed to the side edge and 204 side of the furnace body, the injected oxygen is injected to the side edge and 204 side without being blown to the center part, and the refractory is locally eroded. Shorten the service life of the, and the oxygen injection direction is eccentric, the reaction between the normal oxygen and molten steel is not properly performed, the refining operation time is long, there is a problem that greatly reduces the work productivity.

Therefore, the present invention was devised to solve the above problems, and its purpose is to ensure that the wear portion of the lance body due to the collision with the ferroalloy is not locally generated on the outer circumferential surface of the ferroalloy, and is evenly generated. By rotating the lance body in one direction, it is intended to provide a lance local wear prevention device that can extend the service life of the lance, prevent the coolant outflow due to breakage, and prevent deformation of the lance body to prevent eccentric oxygen injection.

1 is a working state using a general lance facility,

Figure 2 is a block diagram showing a lance local wear prevention device according to the present invention,

Figure 3 (a) is a longitudinal cross-sectional view of the rotary connection constituting the lance local wear prevention device according to the present invention,

Figure 3 (b) is a perspective view of the rotary operation unit constituting the lance local wear prevention device according to the present invention,

Figure 4 is a state diagram showing that the lance with the device according to the present invention is raised,

Figure 5 is a state diagram showing that the lance is installed is installed device according to the present invention.

* Explanation of symbols for the main parts of the drawings *

11a, 12a, 13a ....... top fitting tube member 11b, 12b, 13b ....... bottom fixing tube member

15 ........ Joint members 15a, 15b ....... 1st and 2nd bearing

21 ....... Rack Gear 22 ......... Pinion Gear

23 ....... Roller Support 23a, 23b ........ Guide Roller

24 ...... Cylinder member 110 ........ Lance body

200 ...... Refiner 300 ....... Dust Collector

The present invention as a technical configuration for achieving the above object,

In the dust collecting pipe installed in the upper part of the refining furnace, and the lance body of the multi-pipe structure connected to the first, the second and the third pipe and the refining facility for injecting alloy steel into the refining furnace,

A rotary connection unit connecting the joint member to the lower rotary tube member to be rotatable with respect to the upper fixed tube member of the lance body;

By rotating the lower rotary tube member to change the collision position of the third lower tube hitting the ferroalloy; by providing a lance local wear prevention device comprising a.

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

Figure 2 is a block diagram showing a lance local wear prevention device according to the present invention, Figure 3 (a) is a longitudinal cross-sectional view of the rotary connection constituting the lance local wear prevention device according to the present invention, Figure 3 (b) is It is a perspective view of the rotary operation part which comprises the lance local abrasion prevention apparatus which concerns on this invention.

The lance local wear prevention device 1 according to the present invention, as shown in Figures 2 and 3 (a) (b), ferrous alloy 400 and the lance is introduced into the refining furnace 200 through the chute 403 As it is possible to rotate the lower rotary tube member (11b) (12b) (13b) to enter the refining furnace 200 for oxygen injection so that the collision part of the main body 110 is not concentrated in one place to become the outer circumferential surface, Such a device 1 is composed of a rotary connection 10, a rotary operation unit (20).

That is, the rotary connector 10 is a joint member 15 between the upper fixing tube members 11a, 12a, 13a and the lower rotary tube members 11b, 12b, 13b constituting the lance body 110. A lower rotary tube member (11b) (12b) with respect to the upper fixing tube member (11a) (12a) (13a), which is positioned as a fixing member (303) on the carriage (302) of the dust collecting tube (300). ) 13b is assembled to be freely connectable via the joint member 15. Here, the joint member 15 is preferably a swivel joint having first and second bearings 15a and 15b. .

The upper fixing tube member is fixed to the carriage 302 as a fixing member 303, and communicates with the first tube 101 to which oxygen is supplied to form the inner tube and the first upper tube 11a and the cooling water. It is composed of a second upper pipe (12a) which is in communication with the second pipe (102) to be supplied to form an intermediate tube and a third upper pipe (13a) which is in communication with the third pipe (103) to form an external pipe. The lower rotary tube member includes a first lower tube 11b rotatably connected to the first upper tube 11a via a first bearing 15a of the joint member 15 and the second upper tube. A third lower pipe 12b connected adjacent to a lower end of the 12a and a third bearing rotatably connected to the third upper pipe 13a via a second bearing 15b of the joint member 15. It consists of a lower pipe 13b.

In addition, the water supply and drainage between the lower end of the first upper pipe (11a) and the upper end of the first lower pipe (11b), and between the lower end of the third upper pipe (13a) and the lower end of the third lower pipe (13b). A plurality of sealing members 16a, 16b, 16c and 16d are respectively provided to prevent leakage of the coolant, and between the second upper pipe 12a and the third upper pipe 13a and a second one. Between the lower pipe 12b and the third lower pipe 13b, the second and third upper pipes 12a and 13a and the second and third lower pipes 12b and 13b are not interfering with the flow of cooling water. Welding members 17a and 17b are integrally connected to each other.

On the other hand, the rotary operation unit 20 for rotating the lower rotary tube (11b) 12b (13b) assembled to be rotatable with respect to the upper fixing tube member (11a) (12a) (13a) is shown in FIGS. As shown in (a), the collision of the third lower pipe 13b constituting the outer pipe among the lower outer pipe members hit by the ferroalloy 400 falling into the refining furnace 200 is applied to the entire outer surface. By rotating the lower rotary tube member (11b) (12b) (13b) to be made evenly over, this rotary operation unit 20 is a pair of guide rollers (23a) (23b) fixed to the carriage (302) A rack gear 21 assembled so as to be slidable therein; a pinion gear 22 mounted on an outer circumferential surface of the second lower pipe 13b; and engaged with the rack gear 21; and the rack gear. 21 and the cylinder member 24 to which the rod end is connected. As a result, when the rack gear 21 is linearly moved by forward or backward reciprocating operation of the cylinder member 24, the pinion gear 22 engaged therewith rotates in the forward or reverse direction for oxygen injection. It is possible to change the collision position in which the ferroalloy 400 introduced through the third lower pipe 13b and the chute 403 installed at the lower side of the lance body 110 entered into the refining furnace 200 collide with each other. Here, the guide rollers 23a and 23b are assembled to be rotatable to the roller support 23 fixedly mounted to the carriage 301 as the screw member 29, and the cylinder member 24 to the carriage 302. It is attached to the fixed plate 26 to be installed.

On the other hand, the forward and backward linear movement distance of the rod end of the cylinder member 24 is such that the pinion gear 22 can be rotated 360 degrees without deviating the gear bites of the pinion gear 22 and the rack gear 21. It is preferable to set the linear length of the sensor, and to install a sensor (not shown), such as a limit switch, which controls the reciprocating motion of the cylinder member 24 at the front and rear of the rack gear 21 which is moved back and forth. desirable.

The operation and effects of the present invention having the configuration as described above will be described.

The lance main body 110 in which the apparatus 1 according to the present invention is installed is provided in the carriage 302 of the dust collecting pipe 300 provided on the upper part of the refining furnace 200 filled with molten steel. As shown in Fig. 4, the lance main body 110, which has been in a raised state, is lowered and the carriage 302 assembled to the rail 301 is rotated with respect to the upper fixing pipe members 11a, 12a, 13a made of multiple pipes. The lower body of the lower rotary tube member (11b) (12b) (13b) is installed so as to lower the oxygen to be blown into the molten steel in the furnace, when the lower end is located a certain distance away from the molten steel upper surface of the lance body ( Stop descent of 110).

In this state, oxygen is blown into the furnace through the first and second phases and lower pipes 11a and 11b in which oxygen is blown and communicated through the first pipe 101 of the lance body 110. At this time, when the ferroalloy 400 is dropped through the chute 403, as shown in Figure 5, the falling ferroalloy 400 is the third lower pipe (the outermost of the lower rotary tube member on the fall path) Since the impact is repeated at one site because it hits the outer surface of 13b) and is introduced into the furnace, the collision site may be worn locally. That is, the lance main body 100 lowered for oxygen injection receives the impact generated when colliding with the ferroalloy 400 and wears the collision site.

Therefore, a portion of the lower portion of the third lower pipe 13b that collides with the ferroalloy 400 during the oxygen blowing operation using the lance body 110 is worn by excessive repetitive shock before the wear portion that the ferroalloy 400 hits before being damaged. In the cab, the operator operates the cylinder member 24 forward to change the. In this case, the revolving gear 21 assembled on the rod end of the cylinder member 24 and assembled so as to be slidable to the pair of guide rollers 23a and 23b installed on the carriage 302 is moved linearly forward. Therefore, the pinion gear 22 geared with the rack gear 21 starts to rotate in one direction, and the amount of rotation is made in proportion to the amount of forward movement of the rack gear 21. When the gear 21 moves backward, the pinion gear 22 rotates in the reverse direction.

That is, when the pinion gear 22 is rotated by the linearly shifting rack gear 21, the third lower pipe 13b in which the pinion gear 22 is integrally mounted on the outer circumferential surface thereof has a first upper pipe ( Since 11a) and the second bearing 15b of the joint member 15 are rotatably connected, they are rotated by the linear movement distance of the rack gear 21. At the same time, the second lower pipe 12b connected to the third lower pipe 13b and the welding member 17b, and connected to another welding member, and the first upper pipe 11a and the first bearing 15a. The first lower pipe (11b) connected via the also rotates in the same direction at the same time.

As described above, when the rotation of the lower rotary tube member 11b, 12b, 13b by the reciprocating movement of the cylinder member 24 during the oxygen blowing operation using the lance body 110, the alloy is dropped into Since the impact portion of the third lower pipe 13b on which the iron 400 collides is not concentrated in one place and continuously changes during the linear movement of the rack gear 21, the drop impact of the ferroalloy 400 is reduced. It can be evenly distributed, thereby preventing local wear and deformation of the lance body 110.

On the other hand, when the oxygen injection operation in the refining furnace 200 is finished, the lowered lance body 110 is raised and returned by the electric wire device, and at the same time stops the reciprocating motion to move forward and backward the cylinder member 24 The rotational movement of the lower rotary tube members 11b, 12b and 13b for evenly dispersing the wear part by the drop-in alloy ferroalloy 400 is also stopped.

According to the present invention having the configuration as described above, the lower rotary tube member (11b) (12b) (13b) with respect to the upper fixing tube member (11a) (12a) 13a constituting the lance body 110 is rotatable. The joint member 15 is connected to each other so that the rack gear 21 linearly actuated by the cylinder member 24 and the pinion gear 22 which are rotated and operated by the lower rotary tube member 11b ( 12b) (13b) by connecting, the lower rotary tube member (11b) (12b) (13b) of the lower lance main body 110 for oxygen blowing to rotate the operation during the oxygen blowing operation to drop-in the ferroalloy (400) Since it can evenly distribute the collision area with the outer circumferential direction, it is possible to prevent the leakage of cooling water through the damage and the damage caused by the intensive collision as in the prior art, to improve the safety of refining work, and to significantly improve the service life compared to the conventional one. It can be used to prevent bending deformation of the lance body and A practical effect is obtained which improves the reactivity of the blown oxygen and prevents the refractory of the inner wall of the furnace from being damaged by the eccentric oxygen injection as in the prior art.

Claims (3)

Dust collecting pipe 300 is installed on the top of the refining furnace 200, and the lance body of the multi-pipe structure is installed so as to be able to move, and connected to the first, second and third pipes 101, 102, 103 ( In the refining facility to inject the alloy 400 into the 110 and the refining furnace 200, Rotating connection part connecting the joint member 15 so as to rotate the lower rotary tube members 11b, 12b, 13b with respect to the upper fixing tube members 11a, 12a, 3a of the lance body 110. (10); and, And a rotation operation unit 20 for rotating the lower rotary tube members 11b, 12b and 13b to vary the collision position of the third lower tube 13b that strikes the ferroalloy 40. Lance local wear prevention device characterized in that. The first upper tube 11a of claim 1, wherein the upper fixing tube member is fixed to the carriage 302 as a fixing member 303, and communicates with the first tube 101 to which oxygen is supplied to form an inner tube. And the second upper pipe 12a communicating with the second pipe 102 through which the coolant is supplied to form an intermediate tube, and the third upper pipe 13a communicating with the third pipe 103 through which the coolant is drained to form an external pipe. The lower rotary tube member is a first lower tube (11b) rotatably connected to the first upper tube (11a) via the first bearing (15a) of the joint member (15), and Rotatable to the third upper pipe (13a) via the second lower pipe (12b) connected to the lower end of the second upper pipe (12a) and the second bearing (15b) of the joint member (15). Lance local wear prevention device, characterized in that consisting of the third lower pipe (13b) connected. According to claim 1, wherein the rotating operation portion 20 is a rack gear 21 assembled to be slidable to a pair of guide rollers (23a, 23b) and the outer peripheral surface of the second lower pipe (13b) And a pinion gear (22) fitted to the rack gear (21) and a cylinder member (24) to which the rack gear (21) and the rod end are connected.