JP7027267B2 - Pig iron cutting device and pig iron cutting method in a blast furnace - Google Patents

Description

According to the present invention, when the pig iron is cut with the core bit of the core boring machine to form a through hole, the core boring machine can be fixedly installed on the pig iron against the reaction force at the time of forming the through hole. In particular, the structure is simple and the core boring machine can be easily fixedly installed on the pig iron, which enables the core boring machine to stably and efficiently form through holes in the pig iron. The present invention relates to a pig iron cutting device and a pig iron cutting method in a blast furnace.

Patent Documents 1 to 4 are known as techniques applicable when removing pig iron remaining inside the furnace body of a blast furnace. The "method for removing the residual pig iron of the blast furnace" of Patent Document 1 is a method of removing the residual pig iron in the blast furnace having an iron skin on the outer periphery, and removes a part of the iron skin existing on the lower outer periphery of the blast furnace. A first rupture hole is formed in the exposed portion of the residual pig iron, and the iron skin existing at a position other than the opening portion in the lower outer periphery of the blast furnace is penetrated into the residual pig iron. A second blast hole is drilled, and an explosive is loaded into the first and second blast holes to rupture and remove the residual iron.

Patent Document 2 "Pig iron cutting device and pig iron cutting method in a blast furnace" is for removing the pig iron remaining inside the furnace body of a blast furnace composed of an outer iron skin and an inner refractory brick as a block-shaped pig iron block. In addition, it is a pig iron cutting device in a blast furnace for making a cut in the pig iron to form a cut surface, and two wire saw wiring paths provided in parallel through the refractory in the pig iron. And, in order to communicate these two wire saw wiring paths with each other, the connecting path provided on the pig iron in a direction intersecting with these wire saw wiring paths, and the above one wire saw wiring path to the above. A wire saw that is inserted into the other wire saw wiring path via a connecting path and extends to the outside of the furnace body, a wire saw drive device that is installed outside the furnace body and drives the wire saw, and two wire saw arrangements. A fixed sheave that is located inside the furnace body and guides the wire saw to the wire saw drive device in each of the rope paths, and an intermediate position between the two wire saw wiring paths along these wire saw wiring paths. A through hole formed by drilling a hole in the pig iron and the furnace body and communicating with the connecting path, and a wire saw slidably provided in the through hole and straddling the two wire saw wiring paths. The fixed sheave is hung on the cut surface in order to form a cut surface up to a position along the inner edge of the refractory brick, which is provided with a traction means for pulling toward the outside of the furnace body so as to approach the inner edge of the refractory brick. The wire saw is movable toward the furnace body to the inner edge position of the refractory brick and is positioned at the inner edge position of the refractory brick.

The "demolition method" of Patent Document 3 is provided with a division line setting process for setting a division line for dividing the residual metal and a hydraulic drill device for drilling downward, and runs on the residual metal. A drilling process of drilling a plurality of dividing holes along the dividing line and at predetermined intervals throughout the dividing line with a possible hydraulic crawler drill, and removing the hydraulic crawler drill from the residual metal after the drilling process is completed. It is composed of a drilling machine moving-out step and a split block carry-out step in which the residual metal is divided by a split line by a plurality of split holes separated by a predetermined interval and carried out as a split block.

In the "method of dismantling reinforced concrete" of Patent Document 4, the concrete portion of the reinforced concrete wall is formed with a continuous grid-like groove on the wall surface by a striking drill, and the portion including the reinforcing bar in the deep part of the continuous groove is reinforced by a core cutter. After cutting and repeating these piercing means to pierce a grid-like continuous groove to a predetermined depth, a cut portion is formed from the upper part to the lower part to reach the deep part of the continuous groove and cut into a desired block shape. I try to do it.

Japanese Patent No. 3977543 Japanese Patent No. 5512300 Japanese Unexamined Patent Publication No. 2012-162787 Japanese Unexamined Patent Publication No. 61-158569

Regardless of the background technology, when cutting pig iron, etc., blasting holes, wire saw paths, split holes, continuous grooves, and other holes are formed in the pig iron by drilling with a drilling device. ..

When forming a hole in pig iron with a drill or the like, a large reaction force acts on the drilling device in the form of thrust or torque. Since the drilling device is not fixedly installed to the pig iron, the reaction force at the time of drilling, especially the thrust, may cause the drilling device to swing or the posture of the drilling device to tilt. Will end up. Since the surface of the pig iron on which the drilling device is installed has unevenness, these swings and the like are to be promoted.

If the drilling device swings or tilts, the drilling may bend or the drilling speed cannot be increased. Therefore, there is a problem that the drilling device cannot perform the work stably and efficiently. there were.

The present invention has been devised in view of the above-mentioned conventional problems, and when a pig iron is cut with a core bit of a core boring machine to form a through hole, the core boring resists the reaction force at the time of forming the through hole. The machine can be fixedly installed on the pig iron, and in particular, the structure is simple and the core boring machine can be easily fixedly installed on the pig iron, which makes it stable in the core boring machine. It is an object of the present invention to provide a pig iron cutting device and a pig iron cutting method in a blast furnace capable of efficiently and efficiently forming a through hole in pig iron.

The pig iron cutting device in a blast furnace according to the present invention is a pig iron cutting device in a blast furnace in which a through hole penetrating the pig iron remaining inside the furnace body of the blast furnace is continuously formed to cut the pig iron in a line. The through hole formed in advance of the core boring machine in which the core bit is rotationally driven to drive the core tube provided at the tip and advances toward the pig iron to cut the pig iron with the core bit to form the through hole. It has a columnar insert that can be freely inserted into and removed from the inside of the blast furnace and a fixing means for fixing the insert to the peripheral wall inside the through hole so as to be detachable. The core boring machine transmits the cutting reaction force transmitted to the boring machine to the pig iron via the insert body to support the anchor portion, and the insert body is located on the side of the core tube. The insert is provided with a guide located above the pig iron and lateral to the core tube to guide the advance of the core tube, and the guide surrounds the peripheral side surface of the core tube. As described above, it is characterized in that it is formed by an arc-shaped concave portion along the outer periphery of the core tube .

The fixing means is provided in the insertion body so as to be expandable toward the peripheral wall inside the through hole, and is expanded and press-contacted with the peripheral wall, and the insertion body is slidable in the axial direction. It is characterized in that it is provided with an operating means that penetrates into the through hole and is projected into the inside of the through hole and is slid to expand the pressure contact means.

The fixing means includes an elastic body that can bulge toward the peripheral wall inside the through hole in the insertion body, and a pressure contact means in which the bulging elastic body is pressed against the peripheral wall, and the insertion body. It is characterized by comprising an operating means that slidably penetrates in the axial direction and protrudes into the through hole, and is slidably operated to bulge the elastic body of the pressure contact means.

The fixing means is provided on the insert body so as to be able to advance and retreat toward the peripheral wall inside the through hole, is advanced and is pressed against the peripheral wall, and the peripheral surface of the insert body is crimped to the peripheral wall by pressure contact reaction force. It is characterized by being a jack to make it.

A plurality of the jacks are provided in the axial direction of the insert.

The anchor portion is characterized in that it is arranged on both sides of the core tube.

In the pig iron cutting method in a blast furnace according to the present invention, the pig iron cutting device in the blast furnace is used, and the through hole penetrating the pig iron remaining inside the furnace body of the blast furnace is continuously formed by using the core boring machine. Then, the pig iron is line-cut.

After the formation of one through hole, the next through hole is formed at a predetermined interval from the one through hole, and then a new through hole is formed between the through holes to form the above-mentioned through hole. It is characterized by continuously forming through holes.

In the pig iron cutting device and the pig iron cutting method in the blast furnace according to the present invention, when the pig iron is cut with the core bit of the core boring machine to form a through hole, the core boring resists the reaction force at the time of forming the through hole. The machine can be fixed to the pig iron and installed, especially the structure is simple and the core boring machine can be easily fixed to the pig iron, which makes the core boring machine stable and efficient. Through holes can be formed in pig iron. In particular, the insert is located laterally to the core tube, and the insert is provided with a guide that is above the pig iron and lateral to the core tube to guide the advance of the core tube. Since the guide is formed by an arc-shaped recess along the outer periphery of the core tube so as to surround the peripheral side surface of the core tube, (1) the upper surface of the pig iron is uneven, and the core bit is unbalanced on the upper surface of the pig iron. Since cutting is started in contact with the core tube, the core tube tends to tilt, and (2) on the side where the through hole is already formed, the reaction force applied to the side surface of the core tube becomes small, which causes the core bit. In addition, the core tube may be tilted toward the through hole because the drilling reaction force is not generated on the existing through hole side. The posture of the tube can be maintained, and a through hole can be formed with high accuracy.

It is a preferable embodiment of the pig iron cutting apparatus and the pig iron cutting method in the blast furnace which concerns on this invention, and is the side view which shows the state which the through hole is formed in the pig iron. It is a plan view corresponding to FIG. It is an enlarged side view of the pig iron cutting apparatus in the blast furnace shown in FIG. 1. It is a schematic plan view of the pig iron cutting apparatus in the blast furnace shown in FIG. 1. In FIG. 4, it is a view taken along the line AA. It is an enlarged view of the main part which shows the fixing means provided in the anchor part of the pig iron cutting apparatus in the blast furnace shown in FIG. It is explanatory drawing explaining another example of the fixing means shown in FIG. 6, (A) is a state before insertion into a through hole, (B) is a state inserted into a through hole, (C) is an operation. It is a figure which shows the state when the rod is pulled up, and (D) is the state which fixed the operation rod to an annular plate. It is explanatory drawing explaining still another example of the fixing means shown in FIG. 6, (A) is the enlarged view of the part | part break | part break | , (C) are sectional views showing a modified example of the configuration of (B). It is explanatory drawing which shows the positional relationship between the anchor part and the core bit with respect to the through hole continuously formed by the pig iron cutting apparatus and the pig iron cutting method in the blast furnace shown in FIG. It is a main part plan view which shows the modification of the pig iron cutting apparatus in the blast furnace which concerns on this invention. 10 is a view taken along the line BB in FIG. 10. It is a side view which shows the other modification of the pig iron cutting apparatus in the blast furnace which concerns on this invention. It is a side view which shows the further modification of the pig iron cutting apparatus in the blast furnace which concerns on this invention. It is explanatory drawing which shows the further modification of the pig iron cutting apparatus in the blast furnace which concerns on this invention, (A) is a side view, (B) is (A), it is a cross-sectional view taken along line CC.

Hereinafter, preferred embodiments of the pig iron cutting device and the pig iron cutting method in the blast furnace according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view showing a state in which a through hole is formed in pig iron by the pig iron cutting device and the pig iron cutting method in the blast furnace according to the present embodiment, FIG. 2 is a plan view corresponding to FIG. 1, and FIG. 3 is a plan view. An enlarged side view of the pig iron cutting device in the blast furnace shown in FIG. 1, FIG. 4 is a schematic plan view of the pig iron cutting device in the blast furnace shown in FIG. 1, and FIG. 5 is a view taken along the line AA in FIG. FIG. 6 is an enlarged view of a main part showing the fixing means provided in the anchor portion of the pig iron cutting device in the blast furnace shown in FIG. 1, and FIG. 7 is an explanatory view illustrating another example of the fixing means shown in FIG. (A) is the state before being inserted into the through hole, (B) is the state when the operation rod is inserted into the through hole, (C) is the state when the operation rod is pulled up, and (D) is the state where the operation rod is an annular plate. 8 is an explanatory view illustrating still another example of the fixing means shown in FIG. 6, in which FIG. 8 is an enlarged view of a partially broken portion, and FIG. 8B is an enlarged view of a partially broken portion. In (A), a cross-sectional view taken along the line BB, (C) is a cross-sectional view showing a modified example of the configuration of (B), and FIG. 9 is a pig iron cutting device and a pig iron cutting method in the blast furnace shown in FIG. It is explanatory drawing which shows the positional relationship between an anchor part and a core bit about a through hole formed continuously.

As shown in FIGS. 1 and 2, the inside of the furnace body 2 of the blast furnace 1 is surrounded by the refractory brick 4 on the foundation portion 3, and the pig iron 5 remains. The pig iron cutting device 6 in the blast furnace according to the present embodiment is used to cut the pig iron 5 into a lump that can be carried out from the inside of the blast furnace 1.

Upon cutting, the pig iron cutting device 6 in the blast furnace according to the present embodiment continuously forms a through hole 7 vertically penetrating in the pig iron 5 so as to reach from the upper surface 5a to the refractory brick 4 below. The pig iron 5 is line-cut into a straight line, a broken line, or a curved line by these continuous through holes 7.

The pig iron cutting device 6 in the blast furnace according to the present embodiment is carried into the furnace body 2 of the blast furnace 1 from an opening (not shown) onto the upper surface 5a of the pig iron 5. As shown in FIGS. 3 to 5, the pig iron cutting device 6 in this blast furnace is configured by providing an anchor portion 8 on the core boring machine 31. The core boring machine 31 and the anchor portion 8 constituting the pig iron cutting device 6 in the blast furnace are mounted on a traveling body 33 that is freely traveled and moved on the upper surface 5a of the pig iron 5.

The core boring machine 31 is mainly built in a support post 34 standing vertically on the traveling body 33, an arm portion 35 provided on the support post 34 so as to be slidable in the vertical direction, and an arm portion 35. Then, the arm portion 35 is provided between the arm portion 35 and the support post 34, and the arm portion 35 is moved with respect to the iron iron 5 along the height direction of the support post 34 by the rotation operation of the operation handle 36 provided on the arm portion 35. An operating force transmission mechanism (see FIGS. 12 and 13) such as a rack and pinion mechanism for linearly reciprocating and sliding the arm portion 35 in the vertical direction in order to move it forward, and a motor portion mounted on the arm portion 35. 37, a motor drive shaft 38 that hangs down from the motor portion 37 and projects downward via the arm portion 35, and a motor drive shaft 38 that is detachably and downwardly provided and is rotationally driven by the motor portion 37. A hollow cylindrical core tube 39 is formed, and an annular cutting groove is cut in the iron iron 5 provided at the lower tip of the core tube 39, and the core body 40 formed by the cutting groove is extracted from the iron iron 5. The core bit 32 is rotationally driven by the motor unit 37 via the core tube 39 so that the through hole 7 is formed.

The core body 40 in the through hole 7 is withdrawn from the through hole 7 at an appropriate timing during the process of line-cutting the pig iron 5. Extraction is performed by welding a hanging tool to the upper end of the core body 40 and lifting the core body 40 with a heavy machine via the hanging tool. Regarding the through hole 7 into which the insertion body 18 of the anchor portion 8 to be described later is not inserted, the internal core body 40 may be extracted or left as it is.

The core bit 32 is formed in the form of a circular blade along the circumferential direction of the core tube 39 in order to form a cutting groove and thus a through hole 7 in a form of digging a circular groove.

When the traveling body 33 to be traveled is stopped at the through hole forming position, the core boring machine 31 is set so that the core bit 32 faces the upper surface 5a of the pig iron 5. While the core tube 39 provided with the core bit 32 is rotationally driven by the motor portion 37, the arm portion 35 on which the motor portion 37 is mounted is moved by the operation handle 36 along the pig iron 5 along the support post 34 via the operation force transmission mechanism. It is advanced toward the upper surface 5a of the. The core tube 39 is moved downward by the advance of the arm portion 35, and the core bit 32 is rotated by the motor portion 37, so that a cutting groove is formed in the pig iron 5.

When the arm portion 35 reaches the lower end of the support post 34, the motor portion 37 is stopped and the connection between the motor drive shaft 38 and the core tube 39 is disconnected. Next, the arm portion 35 is retracted toward the upper end side of the support post 34 by the operation of the operation handle 36, and an additional core tube is added between the retracted motor portion 37 and the separated core tube 39.

After that, the rotational drive of the core tube 39 by the motor portion 37 and the advancement of the arm portion 35 are resumed, and the formation of the cutting groove by the core bit 32 is continued. In this way, the core tube 39 is rotationally driven and advanced toward the pig iron 5, and drilling work is performed until a cutting groove penetrating the pig iron 5 is formed by the core bit 32.

As shown in FIGS. 3 to 5, the core boring machine 31 is integrally provided with an anchor portion 8 at a position adjacent to the core tube 39. The anchor portion 8 is provided on the slide post 10 standing adjacent to the support post 34 on the traveling body 33 and on the slide post 10 so as to be slidable in the vertical direction, and is provided on the slide post 10 at an appropriate height position. The slider 11 is locked and fixed in position, and the slider 11 is detachably provided so as to be located on the side of the core tube 39. A columnar insert 18 is provided vertically so that the center faces in the vertical direction and hangs downward from the traveling body 33, and the insert 18 is provided in the insert 18 and the insert 18 is formed through a through hole 7. It is configured to be provided with a fixing means 19 for fixing the body so as to be detachable.

The vertical movement and position fixing of the slider 11 with respect to the slide post 10 are performed by the same means as the above-mentioned operating force transmission mechanism.

Regarding the height positional relationship between the insert body 18 held at a predetermined height position by the slider 11 and the core bit 32 whose height position is changed by being moved downward from the traveling body 33 by advancing the arm portion 35. Before the drilling work, as shown in FIG. 3, the core bit 32 is higher than the height position of the lower end of the insert body 18, and the core bit 32 is lowered by the advance of the arm portion 35 according to the progress of the drilling work. On the contrary, the lower end of the insert 18 is set to be higher than the height position of the core bit 32 during the drilling work.

Before the start of the drilling work, the lower end of the insert 18 is projected further downward than the core bit 32, so that the insert 18 has the through hole 7 after at least one through hole 7 is formed. It is lowered inward by the slider 11.

Then, when the insertion body 18 is inserted into the through hole 7 and is fixed in the through hole 7 by the fixing means 19 described later, the hole drilling operation accompanied by the lowering of the core bit 32 is performed in the inserted state. The through hole 7 previously formed for inserting the insert body 18 may be formed by the core boring machine 31 or by another drilling means. There may be. Further, the pre-formed through hole 7 may be an unfinished through hole, that is, a hole that has not penetrated (for example, the through hole 7 is finished in a subsequent drilling operation).

The outer diameter of the insert 18 is set so that at least a part thereof can be inserted and removed inside the through hole 7.

The insert body 18 of the anchor portion 8 provided integrally with the core boring machine 31 via the traveling body 33 and the core tube 39 provided in the core boring machine 31 are arranged in parallel with each other in the horizontal direction at a distance from each other. The position of the core tube 39 when performing the drilling work is positioned by the insertion body 18 inserted into the previously formed through hole 7 before the drilling work.

FIG. 12 is a side view showing a modified example of the pig iron cutting device 6 in a blast furnace. In this modification, the traveling body 33 on which the core boring machine 31 is mounted is omitted, and the base plate 13 on which the support post 34 of the core boring machine 31 is erected is fixedly installed on the upper surface 5a of the pig iron 5 with an anchor.

Anchor portion 8 is integrally provided on the base plate 13. Specifically, the insert body 18 is provided on the lower surface of the base plate 13 by vertically hanging from a position separated from the core tube 39. In this modification, a case where a jack 20 is used as the fixing means 19 is shown.

The base plate 13 is configured by vertically sliding two upper and lower plates so as to be stretchable, an inserter 18 is provided on the lower plate material, and a support post 34 is provided on the upper plate material. The horizontal distance between 18 and the core tube 39 may be adjustable.

Even in such a modification, the drilling reaction force such as thrust and torque transmitted to the core boring machine 31 via the core tube 39 can be transmitted to the pig iron 5 by the anchor portion 8 to be supported. , The core boring machine 31 can be fixedly installed with respect to the pig iron 5.

FIG. 13 is a side view showing another modification of the pig iron cutting device 6 in a blast furnace. In this modification as well, the traveling body 33 on which the core boring machine 31 is mounted is omitted as in the above modification, and the anchor portion 8 is provided directly under the support post 34 of the core boring machine 31 at a distance from the core tube 39. Are provided integrally.

Specifically, the lower portion of the support post 34 is used as the insert body 18 to be inserted into the through hole 7. As the fixing means 19, a case where a jack 20 is used is shown.

Even in such a modification, the drilling reaction force such as thrust and torque transmitted to the core boring machine 31 via the core tube 39 can be transmitted to the pig iron 5 by the anchor portion 8 to be supported. , The core boring machine 31 can be fixedly installed with respect to the pig iron 5.

The insertion depth of the insert body 18 inserted into the through hole 7 by moving the slider 11 downward, that is, the dimension from the lower end of the insert body 18 to the pig iron upper surface 5a is determined by the fixing means 19 provided in the insert body 18 through the through hole. It is set to fit inside 7 (see reference numeral P in FIG. 8).

In the present embodiment, the fixing means 19 is provided by being incorporated in the lower portion of the insert 18 as shown in FIGS. 3 to 6. As shown in FIG. 6, in the fixing means 19, the insertion body 18 is formed in the shape of a hollow cylinder, and the insertion body 18 is provided in the insertion body 18 so as to be freely expandable toward the peripheral wall 7a inside the through hole 7, and is expanded. The pressure contact means 23 that is opened and pressed against the peripheral wall 7a, and the operating means 24 that slides through the inside of the insert 18 in the axial direction and protrudes into the through hole 7 and is slid to expand the pressure contact means 23. It is composed of and.

The pressure welding means 23 are below the insertion body 18, are arranged at intervals in the circumferential direction of the through hole 7, and are swingably supported toward the peripheral wall 7a inside the through hole 7, respectively. It is composed of blocks 23a. In the illustrated example, two swing blocks 23a are provided. The swing block 23a is provided on the operation rod 24a of the operating means 24 and is attached to the annular plate 25c installed on the upper surface 5a of the pig iron 5. Further, the operating means 24 is provided on the operating rod 24a that reaches the inside of the through hole 7 and the swing block 23a that is provided at the lower end of the operating rod 24a having a small diameter at the upper end and a large diameter at the lower end. It is composed of a cone member 24b that is surrounded and arranged.

When the operation rod 24a is slid upward while the slider 11 is locked to the slide post 10 and fixed by the insert 18 so that the height of the swing block 23a does not change, the cone member 24b rises. By swinging each rocking block 23a toward the peripheral wall 7a of the through hole 7, the pressure welding means 23 as a whole is expanded and pressed against the peripheral wall 7a so that a fixing action can be obtained. It has become. When the fixing action of the swing block 23a is obtained, the tightening nut 51 provided on the operation rod 24a is turned, descended along the operation rod 24a, screwed onto the upper surface of the annular plate 25c, and pressed. The expanded state of the swing block 23a is maintained. Further, by releasing the screwing of the tightening nut 51 to the annular plate 25c and sliding the operation rod 24a downward, the swing block 23a is separated from the peripheral wall 7a, whereby the fixing action is released. It has become like.

When the insertion body 18 is fixed to the peripheral wall 7a inside the through hole 7 by the fixing means 19, when the through hole 7 is formed in the pig iron 5 by the core bit 32, the pig iron 5 to the core boring machine 31 via the core tube 39. The drilling reaction force transmitted to the pig iron 5 is transmitted from the core boring machine 31 to the pig iron 5 via the fixing means 19 of the insert body 18 and is supported.

Further, due to this fixing action and the guide 12, the core tube 39 is stably guided downward and downward during the drilling operation. The outer surface of the rocking block 23a is subjected to uneven processing so that a frictional force can be obtained when it comes into contact with the peripheral wall 7a inside the through hole 7. Further, at least the outer surface of the rocking block 23a is formed with a hardness higher than that of the pig iron 5 so that wear due to contact with the pig iron 5 forming the peripheral wall 7a inside the through hole 7 is suppressed.

FIG. 7 shows another example of the fixing means 19 provided on the insert body 18. In the fixing means 19, the insert body 18 is formed in the shape of a hollow cylinder, and the insert body 18 is provided with an elastic body 25a that can bulge toward the peripheral wall 7a inside the through hole 7, and the elastic body is bulged. The pressure contact means 25 in which the body 25a is pressed against the peripheral wall 7a, and the elastic body 25a of the pressure contact means 25 are bulged by sliding through the insertion body 18 so as to be slidably penetrated into the through hole 7 and projected into the through hole 7. It is composed of an operation rod 26 as an operation means for causing the operation.

The elastic body 25a of the pressure welding means 25 is formed in the shape of a hollow cylinder having a through hole 25b, and the upper surface thereof is an annular plate joined to an operation rod 26 penetrating the insertion body 18 and installed on the upper surface 5a of the pig iron 5. It comes into contact with 25c. A ring plate 52 is provided on the lower surface of the elastic body 25a, and the nut body 25d is brought into contact with the ring plate 52. The operation rod 26 is screwed from the lower end of the insertion body 18 to the nut body 25d via the through hole 25b.

When the operating rod 26 is slid upward, the elastic body 25a is compressed between the ring plate 52 and the annular plate 25c, whereby the elastic body 25a bulges outward in the radial direction of the through hole 7. It is pressed against the peripheral wall 7a so that a fixing action can be obtained. When the fixing action of the elastic body 25a is obtained, the tightening nut 51 provided on the operating rod 26 is turned, descends along the operating rod 26, screwed onto the upper surface of the annular plate 25c, and pressed against the elastic body 25a. The bulging state of the body 25a is maintained. In particular, since the elastic body 25a can absorb the unevenness of the peripheral wall 7a of the through hole 7 due to its elasticity, it can be brought into close contact with the peripheral wall 7a. Further, by releasing the screwing of the tightening nut 51 to the annular plate 25c and sliding the operation rod 26 downward, the elastic body 25a is restored and separated from the peripheral wall 7a, whereby the fixing action is released. It is supposed to be done.

In the case of the fixing means 19 shown in FIGS. 6 and 7, the insertion body 18 can be positioned at the center of the through hole 7, and the through hole 7 is drilled by the core boring machine 31 at a position adjacent to the anchor portion 8. Positional accuracy can be improved.

FIG. 8 shows still another example of the fixing means 19 provided on the insert body 18. The fixing means 19 is composed of a jack 20 provided in a lower portion of the insert body 18. The jack 20 is provided in the hydraulic unit portion 20a housed inside the insert body 18 and the through hole 7 provided in the hydraulic unit portion 20a through a hole 21 formed in one place around the insert body 18 in the lateral direction. It is composed of a ram 20b that freely advances and retreats outward in the radial direction of the insert body 18 toward the inner peripheral wall 7a.

When the ram 20b is driven by the hydraulic unit portion 20a and advances, it is pressed against the peripheral wall 7a, and the reaction force due to this pressure contact causes the peripheral surface of the insert body 18 to be crimped to the peripheral wall 7a on the opposite side of the hole 21. .. The insert 18 is provided with a gripper 50 made of cemented carbide, which is located on the opposite side of the hole 21 and is unevenly processed and has a large hardness, and the gripper 50 suppresses wear on the peripheral wall 7a inside the through hole 7. While being fixed, it is fixed with a large frictional force. When the ram 20b is driven by the hydraulic unit portion 20a and retracted, the insert body 18 is separated from the peripheral wall 7a inside the through hole 7 together with the gripper 50.

In the illustrated example, two jacks 20 are provided vertically in the axial direction of the insertion body 18, that is, in the depth direction of the through hole 7, and the rams 20b of these jacks 20 are in the same radial direction of the insertion body 18. It is designed to move forward and backward. By providing two or more jacks 20 in this way, the insert 18 is stably fixed in the through hole 7 over a long distance. FIG. 8B shows a case where one gripper 50 is provided, and FIG. 8C shows a case where two grippers 50 are provided around the insert 18 at intervals. The hydraulic pressure to the hydraulic unit portion 20a may be supplied from the core boring machine 31 side through the inside of the insertion body 18, or may be performed by providing a separate hydraulic pressure supply system.

Further, the peripheral side surface of the insert 18 located on the side of the core tube 39 is formed in a shape surrounding the peripheral side surface of the core tube 39, and is above the upper surface 5a of the pig iron 5 and is the core tube 39. A guide 12 is provided to guide the advance of the core tube 39 so as to be positioned laterally. In the present embodiment, the guide 12 is formed by an arcuate recess along the outer periphery of the core tube 39 in the vertical direction, thereby partially surrounding the peripheral side surface of the core tube 39 and the core tube 39. Regulates deviations such as tilting.

Specifically, the upper surface 5a of the pig iron 5 has irregularities, and the core bit 32, which has a circular blade shape, comes into disproportionate contact with the upper surface 5a of the pig iron 5 to start cutting, so that the core tube 39 is tilted. easy. Further, on the side where the through hole 7 is already formed, the reaction force applied to the side surface of the core tube 39 becomes small, which may cause the core bit 32 to tilt. Further, since the drilling reaction force is not generated on the existing through hole 7 side, the core tube 39 may be tilted toward the through hole 7. In the present embodiment, the guide 12 can keep the posture of the core tube 39 vertically downward, and the through hole 7 can be formed with high accuracy.

As shown in FIG. 9, the through hole 7x formed in advance for inserting the insert 18 and the core bit 32 for newly forming the through hole 7 are spaced so as to wrap each other. Alternatively, the lateral horizontal spacing Z of these through holes 7x and the core bit 32 wraps around them and is located between them. W; W may be the hole diameter of the through hole 7).

In the latter case, in order to continuously form the through holes 7, two through holes 7x and 7y to be formed in advance are formed side by side, and the insert 18 is sequentially inserted into these through holes 7x and 7y to form a core bit. Drilling work by 32 is performed.

Although the number of through holes 7 formed in advance is different, in any of the above cases, through holes 7 for line-cutting the pig iron 5 are continuously formed. Further, as shown by the arrow Q in FIG. 9, the form of the line cut is not limited to a linear shape but is a polygonal line shape or a curved shape by making an angle between the adjacent through holes 7.

10 and 11 are views showing still another modification of the pig iron cutting device 6 in a blast furnace, FIG. 10 is a plan view of a main part, and FIG. 11 is a view taken along the line BB in FIG. be. In this modification, a pair of anchor portions 8 are provided on both sides of the core tube 39.

The configuration of the core boring machine 31 and the anchor portion 8 is the same as that of the above embodiment. If a pair of anchor portions 8 are provided on both sides of the core tube 39, the action of fixedly installing the core boring machine 31 and the action of guiding the core tube 39 are further improved, and the core boring machine 31 is more stable and efficient. The through hole 7 can be formed in the pig iron 5.

In the case of this modification, two through holes 7 are first formed in advance with an interval of one through hole, and each insert 18 is inserted into each of the two previously formed through holes 7. Then, the through hole 7 is drilled between these through holes 7 by the core boring machine 31, and three through holes 7 are formed as a set. After that, one through hole 7 is formed in advance with respect to the through hole 7 located at the end of the three through holes 7 at an interval of one through hole, and core boring is performed between these through holes 7. Two through holes 7 are newly installed by drilling the through holes 7 with the machine 31.

In this case, two core boring machines 31 are used, and one unit forms one through hole 7 in advance with a space Z for one through hole with respect to the through hole 7 located at the end. It is desirable that the other unit further forms a through hole 7 between these two through holes 7. It is not necessary to extract the core body 40 from the through hole 7 in the middle of these three through holes 7.

FIG. 14 is an explanatory diagram showing still another modification of the pig iron cutting device 6 in a blast furnace. In this modification as well, the traveling body 33 on which the core boring machine 31 is mounted is omitted as in the above modification.

In this modification, based on the configuration of FIG. 13, the lower end portion of the support post 34 of the core boring machine 31 is bent laterally toward the side of the core tube 39, and the insert body 18 of the anchor portion 8 is integrated. In addition, the insert body 18 is provided with a guide 12 similar to that shown in FIG. In such a modified example, the guide 12 can accurately guide the advance of the core tube 39.

Next, a method for cutting pig iron in a blast furnace using the pig iron cutting device 6 in the blast furnace according to the present embodiment will be described. The method for cutting pig iron in a blast furnace according to the present embodiment is basically to continuously provide a through hole 7 penetrating the pig iron 5 remaining inside the furnace body 2 of the blast furnace 1 through a core boring machine 31 or the like. The pig iron 5 is formed and the pig iron 5 is line-cut. At that time, after the formation of one through hole 7, the next through hole 7 is formed at a predetermined interval from the one through hole 7, and then the next through hole 7 is formed. A case is included in which a new through hole 7 is formed between these through holes 7 to continuously form the through hole 7.

When cutting the pig iron 5 remaining inside the furnace body 2 of the blast furnace 1, the traveling body 33 provided with the core boring machine 31 and the anchor portion 8 and the core boring machine 31 shown as a modification in FIGS. 12 to 14 Is carried onto the upper surface 5a of the pig iron 5. In the drilling work, it is efficient to use a plurality of traveling bodies 33 equipped with a core boring machine 31 and the like.

First, of the through holes 7 that are continuously formed and line-cut the pig iron 5, the first through holes 7 are formed in advance as through holes 7 for inserting the insert body 18 of the anchor portion 8. As described above, one or a plurality of through holes 7 to be formed in advance are formed depending on the distance between the insert 18 and the core tube 39.

As described above, these pre-formed through holes 7 may be formed by the core boring machine 31 constituting the pig iron cutting device 6 in the blast furnace according to the present embodiment, or may be formed by other drilling means. However, it may be either.

Next, the insert body 18 is inserted into the previously formed through hole 7 by sliding the slider 11 of the slide post 10 and lowering it. The fixing means 19 of the insertion body 18 inserted into the through hole 7 is operated, the swing block 23a is pressed against the peripheral wall 7a inside the through hole 7, and the insertion body 18 is brought into the peripheral wall 7a of the through hole 7 by this pressure contact reaction force. It is crimped and fixed.

The insertion depth of the insertion body 7 into the through hole 9 is sufficient to accommodate the swing block 23a, and since it is not necessary to insert the insertion body 7 deeply, the anchor portion 8 can be easily and quickly installed without any trouble. Can be completed.

By fixing the insert body 18 to the through hole 7, the core boring machine 31, and by extension, the traveling body 33 on which the insert body 18 is mounted can be fixedly installed to the pig iron 5.

At this time, the insert body 18 is fixed inside the through hole 7 below the pig iron upper surface 5a, while the core bit 32 is located above the pig iron upper surface 5a. After the insert body 18 is fixed inside the through hole 7, the hole drilling work by the core bit 32 is started. In the drilling work, the motor portion 37 of the core boring machine 31 rotates and drives the core bit 32 via the core tube 39, and the arm portion 35 operated by the operation handle 36 advances the motor portion 37 toward the pig iron 5. Do it by.

When the core bit 32 forms the through hole 7 in the pig iron 5, the drilling reaction force such as thrust and torque transmitted to the core boring machine 31 via the core tube 39 is transmitted by the anchor portion 8, that is, the fixing means 19. It is transmitted to and supported by the pig iron 5 by the insert 18 fixed in the through hole 7.

Since the anchor portion 8 transmits the drilling reaction force to the pig iron 5 to support it, it is possible to suppress the runout motion that occurs in the core boring machine 31 and the traveling body 33 provided with the core boring machine 31. Further, it is possible to prevent the posture of the traveling body 33 from tilting.

Further, the distance between the insert body 18 and the core tube 39 forming the through hole 7 should be narrower than one to two at most in the outer diameter of the core tube 39, as in the modification of FIG. 13, for example. The core boring including the traveling body 33 has a short distance between the position where the drilling reaction force is generated (core tube 39) and the fixing position (inserting body 18) that resists the drilling reaction force. The stress load acting on the machine 31 side can be reduced, and the drilling reaction force can be efficiently and stably resisted.

Therefore, it is possible to prevent the through hole 7 formed by the core boring machine 31 from bending, and at the same time, the work can be performed at a high drilling speed, and the through hole 7 can be formed stably and efficiently. Can be done.

In particular, since the core boring machine 31 can cut with a small power, the reaction force generated in the cutting work is small, and the core body 40 remaining in the core tube 39 supports the core tube 39 from the inside, so from this aspect. Further, the through hole 7 formed by the core boring machine 31 can be formed with high positional accuracy and without hole bending, and the through hole 7 can be formed stably and efficiently. As for the guide 12, it is sufficient to prevent the hole (through hole 7) from being bent at the first stage of the hole drilling work by the core bit 32, so that it is just above the through hole 7 into which the insert body 18 is inserted, that is, pig iron. It may be installed so as to be located just above 5.

Since the through hole 7 can be stably formed, the through hole 7 can be formed at an accurate position, and when the through hole 7 is continuously formed, the amount of wrap between the through holes 7 is made small, and the through hole 7 is formed. The number of formed pieces can be reduced, and the construction efficiency can be improved.

Each time a through hole 7 is newly installed, the through hole 7 for fixing the insertion body 18 of the anchor portion 8 is shifted, and the core boring machine 31 continues to form the new through hole 7 to penetrate the pig iron 5. The holes 7 can be continuously formed to cut the pig iron 5 in a line.

The anchor portion 8 for supporting the drilling reaction force on the pig iron 5 is composed of the insertion body 18 and the fixing means 19 and is only integrally provided on the core boring machine 31, and at the same time, the structure is simple and at the same time. The core boring machine 31 can be appropriately and reliably fixedly installed on the pig iron 5.

With the core boring machine 31 described above, for example, even if the distance between the through holes is about 5 mm, the holes can be drilled. Further, even if the pig iron surface is wrapped, the remaining portion of the through hole that has been separated from the middle can be drilled by the core boring machine 31. Further, the outer periphery of the furnace can also be drilled if the core boring machine 31 is used.

When cutting the pig iron 5 remaining inside the furnace body 2 of the blast furnace 1, only the traveling body 33 provided with the core boring machine 31 and the anchor portion 8 may be used. In that case, FIGS. 12 to 14 show. The pig iron cutting device 6 according to the modified example shown may be mixed, or only the pig iron cutting device 6 according to these modified examples may be used. Further, a drilling machine for forming a circular through hole in the pig iron 5 by a drill may be used in combination.

In the above embodiment, the case where the anchor portion 8 is integrally provided on the core boring machine 31 has been described, but the core boring machine 31 and the anchor portion 8 can transmit the reaction force required for drilling to the pig iron 5. That is, the anchor portion 8 and the core boring machine 31 may be manufactured separately, and the reaction force acting on the core boring machine 31 may be generated by connecting the two with a taut chain or the like. The anchor portion 8 on the pig iron 5 side may be burdened.

The present invention is not limited to the content specifically described in the above-described embodiment, and can be appropriately modified as long as it is within the scope of the claims. The insert body 18 of the anchor portion 8 may be arranged, for example, at a distance such that the insert body 18 and the core tube 39 straddle two or three through holes 7, and the position of the slide post 10 can be adjusted freely. , The interval may be adjustable.

1 Blast furnace 2 Furnace 5 Pig iron 6 Pig iron cutting device in blast furnace 7 Through hole 7a Peripheral wall inside through hole 8 Anchor 12 Guide 18 Columnar insert 19 Fixing means 20 Jack 23 Pressing means 24 Operating means 25 Pressing means 25a Elastic body 26 Operation rod 31 Core boring machine 32 Core bit 39 Core tube

Claims (8)

A pig iron cutting device in a blast furnace that continuously forms through holes through the pig iron remaining inside the furnace body of the blast furnace to cut the pig iron in a line.
The through hole formed in advance of the core boring machine in which the core bit is rotationally driven to drive the core tube provided at the tip and advances toward the pig iron to cut the pig iron with the core bit to form the through hole. It has a columnar insert that can be freely inserted and removed inside the hole and a fixing means for fixing the insert to the peripheral wall inside the through hole so as to be detachable, and the core is formed through the core tube when the through hole is formed. It is configured by connecting an anchor portion that transmits the cutting reaction force transmitted to the boring machine from the core boring machine to the pig iron via the insert and supports it.
The insert is located laterally to the core tube and is provided with a guide above the pig iron and lateral to the core tube to guide the advance of the core tube.
The guide is a pig iron cutting device in a blast furnace, characterized in that it is formed by an arc-shaped recess along the outer periphery of the core tube so as to surround the peripheral side surface of the core tube . The fixing means is provided in the insertion body so as to be expandable toward the peripheral wall inside the through hole, and is expanded and press-contacted with the peripheral wall, and the insertion body is slidable in the axial direction. The pig iron cutting device in a blast furnace according to claim 1, further comprising an operating means for penetrating into the through hole and being slid to expand the pressure welding means. The fixing means includes the insertion body with an elastic body that can bulge toward the peripheral wall inside the through hole, and the swelling elastic body is pressed against the peripheral wall with the pressure contact means and the inside of the insertion body. The blast furnace according to claim 1, further comprising an operating means that slidably penetrates in the axial direction and protrudes into the through hole, and is slidably operated to bulge the elastic body of the pressure welding means. Pig iron cutting device. The fixing means is provided on the insert body so as to be able to advance and retreat toward the peripheral wall inside the through hole, is advanced and is pressed against the peripheral wall, and the peripheral surface of the insert body is crimped to the peripheral wall by the pressure contact reaction force. The pig iron cutting device in a blast furnace according to claim 1, wherein the jack is a jack. The pig iron cutting device in a blast furnace according to claim 4 , wherein a plurality of jacks are provided in the axial direction of the insert. The pig iron cutting device in a blast furnace according to any one of claims 1 to 5 , wherein the anchor portions are arranged on both sides of the core tube. Using the pig iron cutting device of the blast furnace according to any one of claims 1 to 6 , the through hole penetrating the pig iron remaining inside the furnace body of the blast furnace is continuously formed by using the core boring machine. A method for cutting pig iron in a blast furnace, which comprises line-cutting the pig iron. After the formation of one through hole, the next through hole is formed at a predetermined interval from the one through hole, and then a new through hole is formed between the through holes to form the above-mentioned through hole. The method for cutting pig iron in a blast furnace according to claim 7, wherein through holes are continuously formed.

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