JP6167727B2 - Converter cleaning equipment - Google Patents

Description

  The present invention relates to an under-furnace cleaning facility that removes molten metal, steel slag, and the like that have fallen under the furnace.

  The hot metal discharged from the blast furnace is subjected to dephosphorization, decarburization, removal of impurities, etc. in the converter. In the converter process, for example, the molten metal in the converter after the dephosphorization process is once discharged into a recharging pan placed on a carriage that runs under the converter furnace, and the steel slag remaining in the converter is , It is discharged into a steel pan placed on another cart. After that, the dephosphorized molten metal in the recharging pan is charged again in the converter, decarburized, and then put out into a steel receiving pan waiting under the converter. .

  When the hot water is discharged from the converter or the steel plate is discharged, the molten metal or the steel plate may scatter and fall outside the pan. In addition, while the molten metal treatment is performed in the converter, the molten metal and the steel plate may be scattered and dropped from the converter. In this way, the molten metal or steel slag falling under the converter must be discarded (hereinafter, such molten metal or steel slag is referred to as “waste”). The waste that falls under the converter accumulates in the molten metal outflow prevention groove.

  The molten metal spill prevention groove is a groove formed between the rails of the bogie running rail laid under the converter. In the unlikely event that the converter has cracked, the molten metal in the converter leaks out. In addition, it plays a role of retaining the molten metal in the groove and preventing the molten metal from flowing out of the converter facility. This molten metal outflow prevention groove has a volume (length, width, depth) larger than the amount of molten metal charged into the converter at a time.

  However, if the waste is accumulated too much in the molten metal spill prevention groove, the molten metal storage space in the molten metal spill prevention groove is reduced by the amount of waste, and all the molten metal in the converter leaks out. The molten metal cannot be kept in the groove.

  In order to prevent such a situation, it is necessary to periodically clean the inside of the molten metal outflow prevention groove. As a conventional cleaning facility under a converter, there is one in which a scraper is attached to a front portion of a carriage on which a pan is placed and a hydraulic cylinder is used as a height adjustment mechanism of the scraper (Patent Document 1). According to the converter cleaning equipment described in Patent Document 1, the waste under the converter can be scraped and removed as the carriage moves.

Japanese Patent Laid-Open No. 5-9541

  However, the converter cleaning equipment described in Patent Document 1 uses a hydraulic cylinder for the height adjustment mechanism of the scraper, and due to the influence of the heat of waste in a high temperature state (about 700 ° C. to 800 ° C.), Defects such as oil leakage due to damage to the packing of the hydraulic cylinder are likely to occur, and the device is likely to fail. Also, since a link mechanism was used to adjust the height of the scraper, failures due to repeated use were likely to occur.

  In view of the above circumstances, an object of the present invention is to provide an under-furnace cleaning facility using a simpler structure than before.

In order to solve the above-mentioned problems, according to the present invention, there is a cleaning equipment under a converter that removes waste under the converter, and a cleaning cart that runs under the converter and is laid on the ground surface under the converter. A rail for traveling the vehicle, a melt outflow prevention groove provided between the rails for preventing the outflow of the melt to the outside of the equipment, and an inclination from the ground surface toward the groove bottom of the melt outflow prevention groove The cleaning carriage includes a carriage main body traveling on the rail, and a front portion of the carriage main body along a direction orthogonal to the traveling direction of the carriage main body in a plan view. A scraper that is rotatably supported, and a tip of a groove corresponding portion that is a portion corresponding to the molten metal outflow prevention groove of the scraper and the molten metal when the cart body travels above the molten metal outflow prevention groove There is a gap between the bottom of the outflow prevention groove As made, the provided Oite the carriage body below the shaft support of the scraper, and a stopper for restricting the rotation of the scraper abuts against the lower surface of the rotated said scraper, said scraper said groove corresponding portion, the scraper has said bogie the melt outflow prevention groove so as to cover a width and length as viewed from the traveling direction of the body in a state of being restricted to rotate in the stopper, of said carriage body of The waste in the molten metal spill prevention groove can be pushed out along the traveling direction of the carriage main body as it advances, and the tip of the groove corresponding part is grounded on the lower surface of the groove corresponding part of the scraper. this wheels in contact with the Oite ground surface or the slope portion surface and during traveling of the carriage body so as not to contact the slope portion is attached BOF under cleaning equipment, wherein is provided.

The rail-corresponding portion, which is a portion corresponding to the rail, of the scraper has a tip so that the scraper is supported in a state where a gap is formed between the scraper and the stopper when rotation is restricted by the stopper. There shorter than the tip of the groove corresponding portion of the scraper, the waste on the rail with the advance of the carriage body may have a shape capable extruded along the traveling direction of the carriage body.

A sub-scraper is provided between the scraper and the wheel of the cart body, and the sub-scraper covers the space on the rail when viewed from the traveling direction of the cart body , and the cart body together with the forward waste on the rail may have a shape capable of extrusion in the traveling direction of the carriage body.

The slope portion may be configured by a scraper rail to which a wheel of the scraper is fitted, and the scraper rail may be provided so as to protrude from a ground surface toward a groove bottom of the molten metal outflow prevention groove.

The surface of the scraper may be hardened. The cleaning carriage may include a lifting mechanism that lifts the scraper so as to support the scraper while the tip of the groove corresponding portion of the scraper is at a position higher than the ground surface when the carriage main body travels .

  According to the present invention, the frequency of occurrence of failure of component parts can be reduced by simplifying the structure of the converter cleaning equipment without using a hydraulic cylinder or a link mechanism.

It is a schematic plan view which shows the converter cleaning equipment which concerns on embodiment of this invention. It is the schematic which shows the AA cross section view in FIG. It is an enlarged view of the cleaning trolley in FIG. It is AA sectional view which shows the cleaning process of the cleaning equipment under a converter. It is AA sectional view which shows the cleaning process of the cleaning equipment under a converter. It is the schematic which shows the BB cross section view in FIG. It is AA sectional view which shows the cleaning process of the cleaning equipment under a converter. It is AA sectional view which shows an example of the running form of a cleaning trolley. It is an AA sectional view showing cleaning equipment under a converter concerning another embodiment of the present invention. It is BB sectional view which shows the form which provided the sub scraper.

  Hereinafter, an embodiment of the present invention will be described based on a converter cleaning equipment 1. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 1 and 2, the converter cleaning equipment 1 includes, for example, a first rail R <b> 1 on which a steel receiving cart runs, a second rail R <b> 2 on which a steel cart runs, and the vicinity of the converter C The molten metal outflow prevention groove 2 provided in a portion excluding the first rail R1 and the second rail R2 and a cleaning carriage 3 traveling under the converter.

  The first rail R1 and the second rail R2 are laid so that the rail upper surface is substantially equal to the ground surface GL. That is, the traveling surface of the cleaning carriage 3 is lower than the ground surface GL. Moreover, as shown in FIG. 1, between the first rail R1 and the second rail R2, a scraper rail 4 on which a wheel 11 of a scraper 8 described later is fitted is laid. As shown in FIG. 2, the tip of the scraper rail 4 is formed so as to incline from the ground surface GL toward the groove bottom of the molten metal outflow prevention groove 2 and protrudes from the upper surface of the wall surface of the molten metal outflow prevention groove 2. (Rail protrusion 5).

  In addition, as shown in FIG. 2, the melt outflow prevention groove 2 has a certain depth along the traveling direction T of the cleaning carriage 3, but the depth of the groove is at a place away from the converter C. Further deep pits 6 are formed.

  Next, the configuration of the cleaning carriage 3 will be described. As shown in FIG. 1 to FIG. 3, the cleaning cart 3 has a cart body 7 on which a pan for receiving molten metal and steel slag in the converter is placed, and a front portion of the cart body 7 (an end portion on the traveling direction T side). A provided scraper 8 is provided. In addition, the kind (molten steel pan, steel casserole pan, etc.) of the pan placed on the cart body 7 is not particularly limited. Further, in the present embodiment, the inside of the molten metal outflow prevention groove between the rails R1 and R2 in which the dropped waste easily collects is cleaned.

  The scraper 8 has, for example, a structure in which ribs are raised on a flat plate having a thickness of about 20 mm. As shown in FIG. 1, the scraper 8 has a molten metal outflow prevention groove 2 in plan view when the carriage body 7 is running. From the tip of the portion (hereinafter referred to as “rail corresponding portion 8b”) where the tip of the portion to be covered (hereinafter referred to as “groove corresponding portion 8a”) covers the first rail R1 and the second rail R2 (trolley rail). Is also formed to be long. The width of the groove corresponding portion 8a is substantially equal to the width of the molten metal outflow prevention groove 2, and the width of the rail corresponding portion 8b is formed to be approximately equal to the rail width of the first rail R1 and the second rail R2. Yes. Further, a hardfacing is applied in the vicinity of the tip of the groove corresponding portion 8a of the scraper 8 (shaded portion in FIG. 1).

  Since the scraper 8 has such a shape, when the scraper 8 to be described later rotates, the waste in the molten metal outflow prevention groove between the rails, the first rail R1 and the second rail R2 The waste on the rail can be pushed out along the traveling direction T of the carriage body 7. In addition, as a material of the scraper 8, for example, SS400 is applied.

  As shown in FIGS. 1 and 3, three brackets 9 are welded to the front portion of the cart body 7 along a direction W orthogonal to the traveling direction T of the cart body 7 in a plan view. One end of 8 is pin-bonded to these brackets 9. Therefore, one end portion of the scraper 8 is pivotally supported at the pin joint portion 10 so as to be rotatable along a direction W orthogonal to the traveling direction T of the carriage body 7 in plan view. The mounting position and the number of brackets 9 are appropriately changed depending on the dimensions of the scraper 8 and the like.

  On the other hand, a wheel 11 fitted to the scraper rail 4 is provided on the lower surface of the other end portion of the scraper 8. The wheel 11 is attached at such a position that the tip of the scraper 8 does not come into contact with the ground surface GL and the protruding portion 5 of the scraper rail 4 when the carriage body 7 travels.

  As shown in FIGS. 1 and 3, a turnbuckle 12 hooked to a bracket (not shown) attached to the carriage body 7 is provided above the pin joint portion 10 (shaft support portion) of the scraper 8. A lifting bracket 13 is provided on the upper surface of the rail corresponding portion 8b corresponding to the first rail R1 of the scraper 8. The lifting bracket 13 and the turnbuckle 12 are connected via a wire 14. Thereby, a lifting mechanism for lifting the scraper 8 is configured.

  A stopper 15 welded to the cart body 7 is provided below the pin joint 10 (shaft support) of the scraper 8. The front end portion of the stopper 15 is an inclined surface 15a, and this inclined surface 15a has an inclination angle that can limit the rotation by contacting the lower surface of the scraper 8 when the scraper 8 described later rotates. doing.

  The cleaning cart 3 is configured as described above. Next, the cleaning method of the molten metal outflow prevention groove | channel 2 by the converter cleaning equipment 1 is demonstrated. In addition, cleaning of the molten metal outflow prevention groove | channel 2 is performed in the hot water discharge process of the molten metal dephosphorized, for example.

  First, the cleaning cart 3 shown in FIG. 2 moves forward along the traveling direction T in order to receive the molten metal in the converter. After that, as shown in FIG. 4, when the wheel 11 of the scraper 8 reaches the protruding portion 5 of the scraper rail 4, the scraper 8 rotates downward by its own weight with the pin joint portion 10 (shaft support portion) as a rotation shaft. At this time, since the wheel 11 of the scraper 8 is in contact with the protruding portion 5 of the scraper rail 4, downward rotation due to the weight of the scraper 8 is temporarily restricted.

  Thereafter, when the wheel 11 that has restricted the rotation of the scraper 8 passes the protruding portion 5 of the scraper rail 4, the scraper 8 further rotates downward due to its own weight. As shown in FIG. 5, the lower surface of the scraper 8 that rotates downward is supported by the lower surface abutting against the inclined surface 15 a of the stopper 15. Thereby, the downward rotation of the scraper 8 is restricted.

  At this time, the scraper 8 is supported in a state where a predetermined gap is formed between the tip of the groove corresponding portion 8 a and the groove bottom of the molten metal outflow prevention groove 2. That is, when viewed from the traveling direction T of the cleaning carriage 3 (FIG. 6), the scraper 8 is supported in a state of covering the melt outflow prevention groove between the rails R1 and R2. When the cart body 7 moves forward in this state, the waste in the melt outflow prevention groove can be pushed out from the melt outflow prevention groove along the traveling direction T of the cart body 7. Thereby, waste can be removed from the molten metal outflow prevention groove.

  Further, in the groove-corresponding portion 8a of the scraper 8, since the portion that comes into contact with the waste is hardened (shaded portion in FIG. 6), the scraper 8 is repeatedly removed by repeatedly removing the waste. Even if the surface wear increases, the scraper 8 is not lost in a short period of time. That is, the frequency of maintenance and replacement of the scraper 8 can be reduced.

  When a predetermined gap is not provided between the tip of the groove corresponding portion 8a and the groove bottom of the molten metal outflow prevention groove 2, in other words, when the tip of the groove corresponding portion 8a and the groove bottom are in contact with each other, The tip of the groove corresponding portion 8a is easily worn by the repeated movement of the carriage body 7. For this reason, it is preferable to provide a predetermined gap between the tip of the groove corresponding portion 8a and the groove bottom.

  On the other hand, if the gap between the tip of the groove corresponding part 8a and the groove bottom of the molten metal outflow prevention groove 2 is too large, it becomes impossible to remove the waste deposited around the groove bottom. However, it is not always necessary to remove all the waste in the molten metal outflow prevention groove. For example, when the volume of the molten metal outflow prevention groove 2 is extremely larger than the amount of molten metal charged into the converter at a time, the leakage from the converter does not occur even if the waste around the groove bottom is not removed. It is possible to keep the molten metal in the groove. That is, the “predetermined gap” between the tip of the groove corresponding portion 8 a of the scraper 8 and the groove bottom of the molten metal outflow prevention groove 2 is appropriately changed according to the structure of the molten metal outflow prevention groove 2. In addition, the clearance gap between the front-end | tip of the groove | channel corresponding | compatible part 8a and a groove bottom is adjusted, for example by changing the dimension of the scraper 8, the position of a shaft support part, the shape of the stopper 15, an attachment position, etc.

  In addition, as shown in FIG. 6, like the groove corresponding portion 8 a of the scraper 8, a predetermined gap is formed between the first rail R <b> 1 and the second rail R <b> 2 at the tip of the rail corresponding portion 8 b. Supported by For this reason, the waste on the rails of the first rail R1 and the second rail R2 can be pushed out along the traveling direction T of the cart body 7 as the cart body 7 advances. Thereby, the waste on the rail can be removed, and the traveling of the carriage can be stabilized. The waste on the rail is pushed down to the molten metal outflow prevention groove 2 by being pushed out by the scraper 8 or is accumulated on the surface of the scraper 8, and finally the rail corresponding portion 8b. It spills from the surface into the molten metal outflow prevention groove 2. Thus, it is removed together with the waste in the molten metal outflow prevention groove.

  As shown in FIG. 7, when the carriage main body 7 further advances, the scraper 8 reaches the pit 6 where the depth of the molten metal outflow prevention groove 2 is further increased. The waste pushed out by the scraper 8 will fall into the pit 6 here. Thereafter, the bogie body 7 moves backward, stops just below the converter C, and receives the molten metal in the converter with a pan placed on the bogie body 7.

  Then, the cart body 7 is further retracted, and the wheel 11 of the scraper 8 comes into contact with the protruding portion 5 of the scraper rail 4. Here, the scraper 8 is lifted upward by the size of the diameter of the wheel 11, and the lower surface of the scraper 8 and the stopper 15 are separated. For this reason, the downward rotation by the dead weight of the scraper 8 is limited by the wheel 11 of the scraper 8. Thereafter, the carriage main body 7 is further retracted, whereby the molten metal outflow prevention groove 2 is cleaned and the molten metal discharged from the molten phosphorus is removed.

  Thus, whenever the hot water discharge process is performed, the molten metal outflow prevention groove 2 is automatically cleaned. If the hot water discharge process is repeated, waste will accumulate in the pit 6 of the molten metal outflow prevention groove 2, but the waste in the pit 6 is periodically carried out using a bulldozer or the like.

  Further, due to various circumstances such as maintenance of the cleaning cart 3, it may be necessary to move the cleaning cart 3 forward and leave the converter as it is. In that case, as shown in FIG. 8, the turnbuckle 12 is fastened and the scraper 8 is lifted. By doing so, the cleaning cart 3 can be moved without the scraper 8 rotating downward by its own weight. Thereby, it is possible to prevent the wheel 11 of the scraper 8 from being caught on the wall surface of the pit 6 when the cleaning carriage 3 is moved backward.

  As described above, according to the present embodiment, since the scraper 8 provided with the wheels 11 is rotatably supported at the front portion of the carriage body 7 of the cleaning carriage 3, the carriage body 7 moves forward and the scraper is moved. 8 can be rotated downward by its own weight. In addition to this, since the protruding portion 5 of the scraper rail 4 is formed in the molten metal outflow prevention groove 2, the scraper 8 of the cleaning carriage 3 traveling under the converter is moved along with the advancement of the main body 7 of the molten metal outflow prevention groove. The waste inside can be pushed out and removed.

  Thereby, the waste of the molten metal outflow prevention groove | channel can be removed with the simple structure which does not use a hydraulic cylinder and a link mechanism like the past. As a result, the frequency of failure of the cleaning cart can be reduced, and the cost spent for maintenance and parts replacement can be reduced.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, in the above-described embodiment, the scraper is attached to the carriage on which the pan that receives the molten metal is placed as the carriage body of the cleaning carriage. However, the scraper may be attached to another carriage (for example, a steel trolley). Or you may attach to the trolley | bogie which cannot mount a pan. That is, the attachment of the scraper is not limited to the carriage, and may be another moving body. The scraper as described in the above embodiment is attached to the moving body that moves along the molten metal outflow prevention groove. In-furnace cleaning equipment belongs to the technical scope of the present invention.

  Moreover, in the said embodiment, although the shape of a scraper becomes a shape which cleans only the molten metal outflow prevention groove | channel inside a 1st rail, as a shape which can also clean the outside of a 1st rail good. Moreover, although the 1st rail and the 2nd rail were used as a rail for carts, the kind and quantity of a rail are not limited to this. Further, the shaft support between the scraper and the cart body is not limited to pin joining. Moreover, parts, such as a bracket and a stopper, can be substituted as long as they act as described in the above embodiment, and the fixing method of the parts is not limited to welding. Moreover, in the said embodiment, although the lifting mechanism of the scraper was comprised using the turnbuckle, you may comprise a lifting mechanism without using a turnbuckle.

  Moreover, in the said embodiment, although it was set as the structure which the wheel 11 of the scraper 8 passes the scraper rail 4, it passes on the slope 16 which connects the ground surface GL and the molten metal outflow prevention groove | channel 2 as shown in FIG. It is good also as composition to do. In addition to this, the cleaning cart is not limited to traveling on the ground surface, and may travel on another horizontal plane (hereinafter referred to as “reference plane”). That is, the slope portion formed so as to be inclined from the reference surface toward the groove bottom of the molten metal outflow prevention groove regardless of whether the reference surface and the groove bottom of the molten metal outflow prevention groove are connected or not. If the cleaning facility is configured such that the scraper wheels pass during traveling, the effects described in the above embodiment can be obtained.

  Further, as shown in FIG. 10, the first rail R1 and the second rail R2 (trolley rail) are disposed on the rail as the cart body 7 moves forward between the scraper 8 and the wheels of the cart body 7. You may provide the sub scraper 17 which has a shape which can extrude an object along the advancing direction T of the trolley | bogie main body 7. FIG. In FIG. 10, only the outline of the scraper 8 is shown by a wavy line, and the wheels of the cart body 7 are not shown. By providing the sub scraper 17, the waste on the rails of the first rail R1 and the second rail R2 that could not be removed by the scraper 8 of the cleaning carriage 3 can be reliably removed.

  The present invention can be applied to an under-furnace cleaning facility that removes waste under the converter.

1 Cleaning equipment under converter 2 Molten metal flow prevention groove 3 Cleaning trolley
4 Scraper rail 5 Rail protrusion (slope)
6 Pit 7 Dolly body 8 Scraper 8a Groove corresponding part 8b Rail corresponding part 9 Bracket 10 Pin joint (shaft support part)
11 Wheel 12 Turnbuckle 13 Lifting bracket 14 Wire 15 Stopper 15a Inclined surface 16 Slope 17 Sub-scraper C Converter GL Ground surface (reference surface)
R1 first rail (trolley rail)
R2 2nd rail (rail for bogie)
T direction of travel W direction perpendicular to the direction of travel

Claims (6)

A sub-furnace cleaning facility for removing waste under the converter,
A cleaning trolley running under the converter,
Rail for trolley travel laid on the ground surface under the converter,
A molten metal outflow prevention groove provided between the rails for preventing the molten metal from flowing out of the facility;
A slope portion formed so as to be inclined from the ground surface toward the groove bottom of the melt outflow prevention groove,
The cleaning cart is
A cart body that travels on the rail;
A scraper that is rotatably supported along a direction orthogonal to the traveling direction of the bogie body in a plan view at the front portion of the bogie body;
When the cart body travels above the molten metal outflow prevention groove, the scraper is disposed between the tip of the groove corresponding portion corresponding to the molten metal outflow prevention groove and the groove bottom of the molten metal outflow prevention groove. so that a gap is formed, the provided Oite the carriage body below the shaft support of the scraper, and a stopper for restricting the rotation of the scraper abuts against the lower surface of the rotated said scraper,
Said groove corresponding portion of the scraper, the scraper has said bogie the melt outflow prevention groove so as to cover a width and length as viewed from the traveling direction of the body in a state of being restricted to rotate in the stopper, the carriage With the advance of the main body, it has a shape that can push the waste in the molten metal outflow prevention groove along the traveling direction of the cart body,
The lower surface of the groove corresponding portion of the scraper, wheel is attached to the distal end of the groove corresponding portion is in contact with the Oite ground surface or the slope portion during traveling of the carriage body so as not to contact the ground surface and the slope portion Cleaning equipment under the converter, which is characterized by The rail-corresponding portion, which is a portion corresponding to the rail, of the scraper has a tip so that the scraper is supported in a state where a gap is formed between the scraper and the stopper when rotation is restricted by the stopper. claims but shorter than the tip of the groove corresponding portion of the scraper, characterized in that the waste on the rail with the advance of the carriage body has a shape capable extruded along the traveling direction of the carriage body Item 4. A converter cleaning equipment according to item 1. A sub-scraper is provided between the scraper and the wheel of the cart body, and the sub-scraper covers the space on the rail when viewed from the traveling direction of the cart body , and the cart body BOF under cleaning equipment according to waste on the rail to claim 1 or 2, characterized in that it have a shape capable of extrusion in the traveling direction of the carriage body with advancement. The slope portion is configured by a scraper rail to which a wheel of the scraper is fitted, and the scraper rail is provided so as to protrude from the ground surface toward the groove bottom of the molten metal outflow prevention groove. The cleaning equipment under a converter in any one of Claims 1-3.   The under-furnace cleaning equipment according to any one of claims 1 to 4, wherein a hardfacing is applied to a surface of the scraper. The cleaning trolley includes a lifting mechanism that lifts the scraper so as to support the scraper while the tip of the groove corresponding portion of the scraper is at a position higher than the ground surface when the trolley main body travels. The converter cleaning equipment in any one of Claims 1-5.

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