JP2020002386A - Method of cutting pig iron in blast furnace - Google Patents

Abstract

To provide a method of cutting a pig iron in a blast furnace capable of linearly cutting the pig iron efficiently, by forming consecutive through holes using through holes formed by a drill bit and through holes formed by a core bit and by utilizing characteristics of the bits.SOLUTION: The method of cutting the pig iron in the blast furnace that consecutively forms through holes 7x and 7y through a pig iron 5 remaining inside a furnace body 2 of a blast furnace 1 to linearly cuts the pig iron uses: a drilling machine 11 that advances, while rotating and driving, toward the pig iron a drilled rod 15 having the drill bit at its tip and drills the pig iron with the drill bit to form a through hole 7x; and a core boring machine 31 that advances, while rotating and driving, toward the pig iron a core tube 39 having the core bit at its tip and extracts a core body formed by cutting the pig iron with the core bit from the pig iron to form a through-hole 7y. The through holes formed by the drilling machine and the through holes formed by the core boring machine are alternately arranged, and adjacent through holes are formed so as to communicate with each other.SELECTED DRAWING: Figure 1

Description

  The present invention is directed to cutting blast furnace pig iron capable of continuously forming through holes by utilizing the characteristics of the bits by forming through holes using a drill bit and forming a through hole using a core bit, and efficiently cutting line of pig iron. About the method.

  Patent Literatures 1 to 5 are known as techniques applicable when removing pig iron remaining inside a furnace body of a blast furnace. Patent Literature 1 discloses a method for removing residual iron in a blast furnace having a steel shell on the outer periphery, and removing a part of the iron shell present on the lower periphery of the blast furnace. And forming a first blast hole in the exposed portion of the residual iron, and penetrates the iron shell at a position other than the opening in the lower outer periphery of the blast furnace to the residual iron. A second blast hole is drilled, an explosive is loaded into the first and second blast holes, and the residual iron is blasted and removed.

  Patent Literature 2 “Pig iron cutting apparatus and pig iron cutting method in a blast furnace” is for removing pig iron remaining in the furnace body of a blast furnace composed of an outer shell and an inner refractory brick into a block-shaped pig iron mass. A cutting apparatus for cutting a pig iron in a blast furnace for forming a cut surface by cutting the pig iron, wherein two pig wires are provided in the pig iron in parallel with each other through the furnace body. And, in order to communicate these two wire saw wiring paths with each other, a connecting path provided in the pig iron in a direction intersecting with these wire saw wiring paths, and A wire saw that is inserted into the other wire saw wiring path via the connection path and extends outside the furnace body, and a wire saw driving device that is installed outside the furnace body and drives the wire saw. A fixed sheave, which is disposed inside the furnace body and guides the wire saw to the wire saw driving device, in each of the two wire saw wiring paths, and a wire sheave arranged at an intermediate position between the two wire saw wiring paths; A hole formed in the pig iron and the furnace body along a cable route, and a through hole communicating with the connection route, slidably provided in the through hole, and straddling the two wire saw routing routes. Pulling means for pulling the wire saw to the outside of the furnace body so as to approach the inner edge of the refractory brick, and the fixed sheave to form the cut surface to a position along the inner edge of the refractory brick. Is positioned at the inner edge position of the refractory brick so that the wire saw hung thereon can be moved toward the furnace body to the inner edge position of the refractory brick. There.

  Patent Literature 3 discloses a dismantling method for dismantling residual iron, comprising a dividing line setting step of setting a dividing line for dividing residual iron, and a hydraulic drill device for drilling downward, and running on the remaining iron. A possible hydraulic crawler drill, along with the dividing line and a plurality of divided holes spaced at a predetermined interval along the entire dividing line, and a hydraulic crawler drill is withdrawn from the residual iron after the completion of the drilling process. The method includes a punching machine leaving process, and a divided block unloading process in which the remaining iron is split on a split line by a plurality of split holes separated by a predetermined interval and is unloaded as a split block.

  Patent Document 4 discloses a “method of forming a continuous grooved hole”, in which an annular hole is formed in a rock surface by the operation of an annular drilling drill mounted on an excavator, and at the same time, a cantilevered cylindrical shape is formed. The core remaining to be formed in the bedrock is used as a guide core to regulate the drilling direction of the drill, and furthermore, drilling means is provided so as to have a predetermined overlapping portion with the annular hole at a position adjacent to the core. While moving, the annular hole is sequentially formed while the core portion is left in the rock, so that a continuous groove portion is formed.

  Patent Literature 5 discloses a method of dismantling reinforced concrete in which a concrete portion of a reinforced concrete wall is provided with a continuous lattice-like groove in the wall surface by a percussion drill, and a portion including a reinforcing bar deep in the continuous groove is provided by a core cutter. After cutting, these piercing means are repeated to pierce the lattice-shaped continuous groove to a predetermined depth, and then a cut portion reaching the deep portion of the continuous groove downward from above is formed and cut into a desired block shape. I am trying to do it. In Patent Literature 5, two types of devices, a hammer drill and a core cutter, are used.

Japanese Patent No. 3977543 Japanese Patent No. 5512300 JP 2012-162787 A JP-A-7-217364 JP-A-61-158569

  Regardless of the background art, when cutting pig iron, etc., drill holes such as blast holes, wire saw paths, split holes, continuous grooves, etc. are formed in pig iron etc. I have.

  In Patent Literatures 1 to 3, drilling is performed only by a drill for drilling residual iron using a carbide tip. Since this type of drill is a type of digging, it needs to be driven with a large output, and it takes a long time to perform a drilling operation, so that there is a problem that a device to be used becomes large and efficiency is not good.

  In Patent Document 4, drilling is performed only by a drill that forms an annular hole in which a core remains, that is, a so-called core cutter. This type of drill is a type of drilling a circular groove, so it can be driven with small output and drilling work can be completed in a short time, but the number of remaining cores increases, and drilling is performed continuously. When forming and cutting pig iron, the core remaining in the drill hole hinders the work, and when the core has to be removed, a great deal of work is required, for example, to break the core separately. In short, there was a problem that the efficiency of the entire pig iron cutting operation was not good.

  Patent Document 5 discloses that a reinforced concrete wall is dismantled by using two types of equipment, a hitting drill for a concrete portion and a core cutter for cutting a reinforcing bar, so that each time the hitting drill hits a reinforcing bar, the drill is once used. It was necessary to insert a core cutter to cut and remove the rebar, and then to extract the core cutter and insert the impact drill again. Further, since the continuous groove is formed only by the drill, there is a similar problem as in Patent Documents 1 to 3.

  The present invention has been made in view of the above-described conventional problems, and by forming through holes using a drill bit and forming a through hole using a core bit, it is possible to continuously form through holes by utilizing the characteristics of those bits, and it is efficient. It is an object of the present invention to provide a method for cutting pig iron in a blast furnace, which is capable of line-cutting pig iron.

  The pig iron cutting method of the blast furnace according to the present invention is a blast furnace pig iron cutting method of continuously forming a through hole in the pig iron remaining inside the furnace body of the blast furnace and line cutting the pig iron, A drilling machine for drilling a drilling rod with a drilling bit provided at the tip thereof toward the pig iron while rotating and driving the drilling rod to form a first through hole by drilling the pig iron with the drilling bit; and a core bit. A core boring machine for rotating the core tube provided at the distal end thereof toward the pig iron while driving the same, and cutting the pig iron with the core bit to form a second through hole; A cutting step of alternately arranging the first through holes and the second through holes by the core boring machine and forming adjacent first and second through holes to communicate with each other. And

  The cutting step includes a drilling step of drilling a plurality of the first through holes with the drilling machine at an interval equal to or smaller than the diameter of the core bit, and a first drilling step between the first through holes. A core boring step of forming the second through hole communicating with the through hole by the core boring machine, and prior to the perforating step, thereafter, performing the core boring step in parallel with the perforating step It is characterized by the following.

  The diameter of the core bit is larger than the outer diameter of the drill bit.

  In the method for cutting pig iron of a blast furnace according to the present invention, through-hole formation with a drill bit and formation of a through-hole with a core bit make it possible to continuously form through-holes by utilizing the characteristics of these bits and efficiently produce pig iron. Can be cut.

It is a side view showing an embodiment of a preferred embodiment of a pig iron cutting method of a blast furnace concerning the present invention. FIG. 2 is a plan view corresponding to FIG. 1. It is a side view which shows an example of the drilling machine used for the pig iron cutting method of the blast furnace shown in FIG. It is explanatory drawing explaining the fixing means provided in the anchor part of the drilling machine of FIG. 3, (A) is an enlarged view with a partially broken main part, (B) is an arrow BB line in (A). FIG. 7C is a cross-sectional view illustrating a modification of the configuration of FIG. 5A and 5B are explanatory diagrams illustrating another example of the fixing unit illustrated in FIG. 4, wherein FIG. 4A is a state before insertion into a through hole, FIG. 4B is a state after insertion into a through hole, and FIG. It is a figure which shows the state at the time of pulling up the rod, and the state which fixed the operation rod to the annular plate, respectively. FIG. 11 is an enlarged view of a main part showing still another example of the fixing unit shown in FIG. 4. It is a side view which shows an example of the core boring machine used for the pig iron cutting method of the blast furnace shown in FIG. It is a side view which shows the other example of the core boring machine shown in FIG. It is a side view which shows another example of the core boring machine shown in FIG. It is explanatory drawing explaining the drill bit and core bit used for the pig iron cutting method of the blast furnace shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining the arrangement | positioning of the through-hole in one suitable embodiment of the pig iron cutting method of the blast furnace concerning this invention.

  Hereinafter, preferred embodiments of a pig iron cutting method for a blast furnace according to the present invention will be described in detail with reference to the accompanying drawings. As shown in FIGS. 1 and 2, pig iron 5 remains inside the furnace body 2 of the blast furnace 1, surrounded by the refractory brick 4 on the base portion 3. The pig iron cutting method for a blast furnace according to the present embodiment is used for cutting the pig iron 5 into a lump that can be carried out of the blast furnace 1.

  In cutting, in the method for cutting pig iron of the blast furnace according to the present embodiment, through holes 7x and 7y vertically penetrating vertically are formed in the pig iron 5 so as to reach from the upper surface 5a to the refractory brick 4 below. The continuous through holes 7x and 7y cut the pig iron 5 in a straight line, a broken line, or a curved line.

  In describing the pig iron cutting method for a blast furnace according to the present embodiment, first, devices and equipment used to form the through holes 7x and 7y will be described. The boring machine 11 and the core boring machine 31 are carried into the inside of the furnace body 2 of the blast furnace 1 from the opening (not shown) on the upper surface 5a of the pig iron 5.

  As shown in FIG. 3, the drilling machine 11 is mounted on an undulating work arm 10 provided on a crawler 9 which is freely moved on the upper surface 5a of the pig iron 5. The drilling machine 11 used in the present embodiment is provided with an anchor portion 8 described later. The drilling machine 11 having the anchor portion 8 is set downward toward the pig iron upper surface 5a by the working arm 10 that is raised and lowered when forming the through hole 7x in the pig iron 5. The drilling machine 11 will be described below in a state where it is set downward.

  The drilling machine 11 is formed to be long in the vertical direction in the vertical direction, and has a base 12 attached to the working arm 10, a rotary drive unit 13 movably mounted on the base 12 in the vertical direction, and a base. A moving mechanism for moving the rotary drive unit 13 back and forth linearly in the vertical direction so as to move the rotary drive unit 13 back and forth with respect to the pig iron 5; A drilling rod 15 provided to face and rotated by the rotation drive unit 13, and a drilling rod 15 provided at the lower end of the drilling rod 15 to form a through hole 7 x in the pig iron 5 through the drilling rod 15. And a drill bit 16 that is rotationally driven by the rotation drive unit 13. The drill bit 16 is formed in the form of a drill that forms the through hole 7x in a digging manner.

  When the traveling crawler 9 is stopped at the through hole forming position, the drilling machine 11 is set downward by the working arm 10 so that the drill bit 16 faces the upper surface 5a of the pig iron 5. While the drilling rod 15 provided with the drilling bit 16 is rotationally driven by the rotary drive unit 13, the rotary drive unit 13 is advanced by the moving mechanism 14 along the base 12 toward the upper surface 5 a of the pig iron 5. . The drilling rod 15 is moved downward by the advance of the rotary drive unit 13, and the drill bit 16 is rotated by the rotary drive unit 13, so that drilling is formed in the pig iron 5.

  When the rotation drive unit 13 reaches the lower end of the base 12, the rotation drive unit 13 is stopped, and the connection between the rotation drive unit 13 and the drilling rod 15 is disconnected. Next, the rotary drive unit 13 is retracted to the upper end side of the base 12 by the moving mechanism 14, and an additional drilling rod is added between the retracted rotary drive unit 13 and the cut drilling rod 15.

  After that, the rotation driving of the drilling rod 15 by the rotation driving unit 13 and the advancement of the rotation driving unit 13 by the moving mechanism 14 are restarted, and the drilling by the drilling bit 16 is continued. In this manner, the drilling rod 15 is advanced toward the pig iron 5 while being rotationally driven, and the drilling operation is performed until the drilling bit 16 forms the through hole 7x penetrating the pig iron 5.

  The drilling machine 11 is integrally provided with an anchor portion 8 at a position adjacent to the drilling rod 15. The anchor portion 8 is provided below the base 12 so as to be removably inserted into the through-hole 7x. The mounting bracket 17 is attached to and fixed to the base 12. And a fixing means 19 provided on the shaft body 18 and detachably fixing the shaft body 18 to the through hole 7x.

  A shaft body 18 held at a fixed height position with respect to the base 12 by a mounting bracket 17, and a drilled hole whose height position changes by being moved downward from the base 12 by the advancement of the rotation drive unit 13. Regarding the height positional relationship with the bit 16, before the drilling operation, the drilling bit 16 is higher than the height position of the lower end of the shaft 18, and the rotation driving unit 13 advances according to the progress of the drilling operation, and the drilling bit 16 is advanced. The lower end 16 is set so that the lower end of the shaft 18 is higher than the height position of the drill bit 16 during the drilling operation.

  Before the drilling operation is started, the lower end of the shaft body 18 projects further downward than the drilling bit 16. Therefore, after the shaft body 18 has at least one through hole 7 x formed, the mounting bracket 17 Attached to. That is, before attaching the anchor portion 8 and at least the shaft body 18 to the drilling machine 11, the drilling machine 11 forms the through hole 7x in advance, and the formed through hole 7x is The shaft 18 is inserted by operating the arm 10.

  Then, when the shaft body 18 is inserted into the through hole 7x and is fixed in the through hole 7x by the fixing means 19 described later, a drilling operation involving lowering of the drill bit 16 is performed in the inserted state. As for the operation of inserting the shaft 18 into the through hole 7x, a mechanism for adjusting the inclination and height of the base 12 may be provided at the tip of the working arm 10.

  The outer diameter of the shaft body 18 is set to a size that can be inserted into and removed from the through hole 7x. The shaft body 18 of the anchor portion 8 provided integrally with the drilling machine 11 and the drilling rod 15 provided in the drilling machine 11 are arranged in parallel at a distance from each other, and the preformed through-hole 7x is formed. The position of the drilling rod 15 at the time of performing the drilling operation is determined by the shaft body 18 inserted before the drilling operation. That is, the formation position of the new through hole 7x formed by the drilling machine 11 is determined by the shaft body 18. Further, the shaft body 18 guides the advance of the drilling rod 15 forming the new through hole 7x.

  The space between the shaft body 18 and the drilling rod 15 in the horizontal direction is set to be smaller than the diameter of a core bit 32 of the core boring machine 31 which will be described later. Thereby, the through-hole 7x formed by the drilling machine 11 and the through-hole 7y formed by cutting by the core boring machine 31 partially overlap, and the through-holes 7x and 7y communicate with each other in the horizontal direction due to the overlap. Thus, continuity of these through holes 7x and 7y is ensured.

  The insertion depth of the shaft 18 inserted into the through hole 7x by the working arm 10, that is, the dimension P from the lower end of the shaft 18 to the pig iron upper surface 5a is provided on the shaft 18 as shown in FIG. The fixing means 19 is set so as to fit inside the through hole 7x.

  In the present embodiment, the fixing unit 19 includes a jack 20 provided at a lower portion of the shaft 18. The jack 20 is provided with a hydraulic unit 20 a housed inside the shaft 18 and a through-hole 7 x through a hole 21 provided in the hydraulic unit 20 a and formed in one place around the shaft 18 to face sideways. And a ram 20b which is allowed to reciprocate radially outward of the shaft 18 toward the inner peripheral wall 7a.

  When the ram 20b is driven and advanced by the hydraulic unit 20a, the ram 20b is pressed against the peripheral wall 7a, and the peripheral surface of the shaft body 18 is pressed against the peripheral wall 7a on the side opposite to the hole 21 by a reaction force due to the pressing. . The shaft body 18 is provided with a gripper 50 made of an ultra-high alloy having a high hardness, which is formed by embossing, which is located on the opposite side of the hole 21, and the gripper 50 is prevented from being worn on the peripheral wall 7 a inside the through hole 7 x. While being fixed with a large frictional force. When the ram 20b is driven backward by the hydraulic unit 20a, the ram 20b, together with the gripper 50, separates the shaft 18 from the peripheral wall 7a inside the through hole 7x.

  In the illustrated example, two jacks 20 are provided vertically in the axial direction of the shaft body 18, that is, in the depth direction of the through hole 7x, and the rams 20b of these jacks 20 are arranged in the same direction in the radial direction of the shaft body 18. They are going to retreat. By providing two or more jacks 20 in this manner, the shaft 18 is stably fixed to the through hole 7x over a long distance. FIG. 4B shows a case where one gripper 50 is provided, and FIG. 4C shows a case where two grippers 50 are provided around the shaft body 18 at intervals.

  When the shaft body 18 is fixed to the peripheral wall 7a inside the through hole 7x by the fixing means 19, when the through hole 7x is formed in the pig iron 5 with the drill bit 16, the pig iron 5 is cut through the drill rod 15 from the pig iron 5. The drilling reaction force transmitted to the drilling machine 11 is transmitted from the drilling machine 11 to the pig iron 5 via the fixing means 19 of the shaft 18 and supported. Further, by this fixing action, in drilling work, the drilling rod 15 is stably guided downward and downward. The hydraulic pressure supply to the hydraulic unit 20a may be performed from the drilling machine 11 side through the inside of the shaft body 18 or may be performed by providing a separate hydraulic pressure supply system.

  The anchor portion 8 for supporting the drilling reaction force on the pig iron 5 is constituted by a shaft body 18 and a fixing means 19 such as a jack 20 and is simply provided integrally with the drilling machine 11, so that the structure is simple. At the same time, the drilling machine 11 can be fixedly and appropriately fixed to the pig iron 5.

  As shown in FIG. 3, the drilling machine 11 is suspended from its base 12 and pressed against the upper surface 5 a of the pig iron 5 by operating the working arm 10 so as to be able to freely contact and separate the drilling reaction force. A pressing member 22 for transmitting a horizontal swing motion to the pig iron 5 is provided. That is, in the present embodiment, in addition to the anchor portion 8, the drilling reaction force transmitted from the pig iron 5 to the drilling machine 11 via the drilling rod 15 at the time of forming the through hole is also generated by the pressing member 22. It has come to be supported by.

  In the illustrated example, the pressing member 22 is formed of a plate-like member whose tip pressed against the upper surface 5a of the pig iron 5 has a blade-like shape. The pressing member 22 is used together with the anchor portion 8 or when forming a through hole in which the shaft body 18 is not inserted into the through hole 7x. The pressing member 22 may be provided on the mounting bracket 17 of the anchor portion 8 or the like.

  The pressing member 22 is simply attached to the drilling machine 11 or the anchor portion 8, and simply presses against the upper surface 5 a of the pig iron 5 by operating the working arm 10. The swing motion of the drilling machine 11 and the like can be suppressed by supporting the pig iron 5.

  FIG. 5 shows another example of the fixing unit 19 provided on the shaft 18. In the fixing means 19, the shaft 18 is formed in a hollow cylindrical shape, and the shaft 18 is provided with an elastic body 25a which can swell toward the peripheral wall 7a inside the through hole 7x. The body 25a is pressed into contact with the peripheral wall 7a, and the body 25a is slidably penetrated in the axial direction in the axial body 18 and protrudes into the through hole 7x. And an operation rod 26 as operation means for performing the operation.

  The elastic body 25a of the press-contact means 25 is formed in a hollow cylindrical shape having a through hole 25b, and the upper surface thereof is joined to the operating rod 26 passing through the shaft 18 and is installed on the upper surface 5a of the pig iron 5. 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 a lower end of the shaft body 18 to a nut body 25d via a through hole 25b.

  When the operation 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 is bulged radially outward to form the through hole 7x. 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 operation rod 26 is turned, descends along the operation rod 26, and is screwed onto the upper surface of the annular plate 25c to be pressed. The swelling 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 7x by its elasticity, it can be in close contact with the peripheral wall 7a. Further, by releasing the screwing of the fastening nut 51 to the annular plate 25c and sliding the operation rod 26 downward, the elastic body 25a is restored and detached from the peripheral wall 7a, thereby releasing the fixing action. It is supposed to be.

  FIG. 6 shows still another example of the fixing unit 19 provided on the shaft 18. In the fixing means 19, the shaft 18 is formed in a hollow cylindrical shape, and is provided on the shaft 18 so as to be openable toward the peripheral wall 7a inside the through hole 7x, and is expanded and pressed against the peripheral wall 7a. The pressing means 23 is configured to extend through the shaft body 18 slidably in the axial direction, protrude into the through-hole 7x, and be slid to expand the pressing means 23.

  The press-contact means 23 are arranged below the shaft body 18 at intervals in the circumferential direction of the through-hole 7x, and each of the press-contact means 23 is swingably supported toward the peripheral wall 7a inside the through-hole 7x. It is composed of a block 23a. The swing block 23a is provided on the operating rod 24a of the operating means 24 and attached to an annular plate 25c provided on the upper surface 5a of the pig iron 5. The operating means 24 includes an operating rod 24a reaching the inside of the through-hole 7x, and an operating rod 24a 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. And a cone member 24b disposed so as to be surrounded.

  When the operation rod 24a is slid upward, the cone member 24b rises and swings each swing block 23a toward the peripheral wall 7a of the through hole 7x, so that the entire pressure contact means 23 is expanded. It is pressed against the peripheral wall 7a so that a fixing action can be obtained. When the fixing action of the swing block 23a is obtained, the tightening nut 51 provided on the operation rod 24a is turned to descend along the operation rod 24a, and is screwed onto the upper surface of the annular plate 25c and pressed. The swing block 23a is kept in the expanded state. Further, the screwing of the tightening nut 51 to the annular plate 25c is released, and the operation rod 24a is slid downward, whereby the swing block 23a is detached from the peripheral wall 7a, thereby releasing the fixing action. It has become.

  In the case of the fixing means 19 shown in FIGS. 5 and 6, unlike the fixing means 19 shown in FIG. The positional accuracy of the through hole 7x drilled by the drilling machine 11 can be further improved.

  Next, the core boring machine 31 will be described. As shown in FIG. 7, the core boring machine 31 is mounted on a traveling body 33 that freely travels on the upper surface 5a of the pig iron 5, similarly to the drilling machine 11. .

  The core boring machine 31 mainly includes a support post 34 erected vertically on a traveling body 33, an arm 35 provided on the support post 34 to be slidable up and down, and a built-in arm 35. The arm 35 is provided between the arm 35 and the support post 34, and the arm 35 is moved relative to the pig iron 5 along the height direction of the support post 34 by a rotation operation of an operation handle 36 provided on the arm 35. An operating force transmitting mechanism (not shown) such as a rack and pinion mechanism for linearly reciprocating the arm 35 in a vertical reciprocating manner in order to move the arm 35 forward, and a motor 37 mounted on the arm 35. A motor drive shaft 38 which is suspended from the motor portion 37 and protrudes downward through the arm portion 35, and which is detachably mounted on the motor drive shaft 38 and faces downward; A hollow cylindrical core tube 39 driven to rotate by 37 and a core tube 39 provided at the lower end of the core tube 39 so as to cut an annular cutting groove in the pig iron 5 to form a through hole 7y. And a core bit 32 that is driven to rotate by a motor unit 37 via the motor.

  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 in the form of digging in a circular shape, and eventually the through hole 7y.

  When the traveling body 33 that is traveling 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 rotating the core tube 39 provided with the core bit 32 by the motor unit 37, the arm unit 35 on which the motor unit 37 is mounted is moved by the operation handle 36 along the support post 34 via the operation force transmission mechanism along the supporting post 34. Is advanced toward the upper surface 5a. As the arm portion 35 advances, the core tube 39 is moved downward, and the core portion 32 is rotated by the motor portion 37, whereby a cutting groove is formed in the pig iron 5.

  When the arm 35 reaches the lower end of the support post 34, the motor 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 to the upper end side of the support post 34 by operating 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 rotation drive of the core tube 39 by the motor unit 37 and the advance of the arm unit 35 are resumed, and the formation of the cutting groove by the core bit 32 is continued. In this manner, the core tube 39 is advanced toward the pig iron 5 while being rotationally driven, and a drilling operation is performed until the core bit 32 forms a cutting groove penetrating the pig iron 5.

  As shown in FIG. 8, the core boring machine 31 is provided with a support post 34 provided on a base 42 fixed with anchor bolts 41 on the upper surface 5 a of the pig iron 5 without being mounted on the traveling body 33 and fixed. You may make it install.

  FIG. 9 is a side view showing still another modified example of the core boring machine 31. Also in this modification, the traveling body 33 on which the core boring machine 31 is mounted is omitted as in the example of FIG. 8, and the anchor portion is provided directly below the support post 34 of the core boring machine 31 at a distance from the core tube 39. 8 are provided integrally.

  Specifically, the lower part of the support post 34 is used as an insert 18 inserted into the through hole 7. The case where a jack 20 is used as the fixing means 19 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 and supported by the pig iron 5 by the anchor portion 8. The core boring machine 31 can be fixedly installed on the pig iron 5.

  FIG. 10 is an explanatory diagram illustrating the drill bit 16 of the drilling machine 11 and the core bit 32 of the core boring machine 31. FIG. 10A shows a side surface and a cut section of the drill bit 16, and FIG. 10B shows a side surface and a cut section of the core bit 32 at the lower end of the core tube 39.

  The drill bit 16 of the drilling machine 11 is, as shown in FIG. 10 (A), a drill bit for residual iron drilling using, for example, a carbide tip, whereas the drill bit 16 of the core boring machine 31 is a core bit. Numeral 32 is a circular blade form in which a groove is dug circularly as shown in FIG. 10 (B).

The cutting area S where the drill bit 16 cuts the pig iron 5 is the cross-sectional area (πR ² ) assuming that the outer diameter J of the drill bit 16 is 2R (R: radius). On the other hand, the cutting area T in which the core bit 32 cuts the pig iron 5 is determined by the fact that the diameter (outer diameter) W of the core bit 32 is the same as the outer diameter of the drill bit 16 (W = 2R), and Is multiplied by the thickness t. As a result, the cutting area T of the core bit 32 is approximately 2πRt, and the cutting area S of the drill bit 16 is R / (2t) times the cutting area T of the core bit 32.

  For example, when the value of R is 20 mm, the cutting area S of the cutting bit 16 is 400π, whereas the cutting area T of the core bit 32 is 40π when the thickness of the blade is 1 mm. Therefore, when forming the through holes having the same hole diameter, the drilling bit 16 requires R / 2 times as much work for cutting as the core bit 32.

  In other words, if the outer diameter J of the drill bit 16 is doubled in order to form a larger through hole in one drilling operation, the cutting area S becomes four times, whereas the core bit 32 Even if the bore (outer diameter) W is doubled, the cutting area T only doubles.

  For this reason, when forming a through hole, the core boring machine 31 is slightly less efficient than the drilling machine 11, but requires less power and can be downsized. On the other hand, in the core boring machine 31, it is necessary to carry out the core body 40 separately from the cut residual iron, but in the drilling machine 11, such processing is not necessary.

  The unloading of the core body 40 is performed, for example, in the case of (1) in the case of a through-hole into which the anchor portion 8 is inserted, and before the installation of the anchor portion 8 (2) in the case where cutting off or unloading of the residual iron is hindered. It may be performed before the operation, and (3) in other cases, after cutting and carrying out the remaining iron.

  Based on the advantages and disadvantages of the drilling machine 11 and the advantages and disadvantages of the core boring machine 31, the diameter W of the core bit 32 is made larger than the outer diameter J of the drilling bit 16 (W> J). Is preferred. Then, in forming a continuous through-hole by overlapping the through-holes 7x and 7y with each other, as shown in FIG. 11, a drill bit is formed by digging a hole with an interval Z equal to or less than the diameter W of the core bit 32. It is preferable that the through-hole 7x is formed by the core bit 32, and then the through-hole 7y is formed by the core bit 32 between the through-holes 7x that have penetrated the pig iron 5 in such a way that the core body 40 is dug.

  Next, a method for cutting pig iron in a blast furnace according to the present embodiment will be described. When cutting the pig iron 5 remaining inside the furnace body 2 of the blast furnace 1, as shown in FIGS. 1 and 2, the boring machine 11 mounted on the crawler 9 and the core boring machine 31 mounted on the traveling body 33 are used. The pig iron 5 is carried on the upper surface 5a. At the time of cutting work, it is efficient to use a plurality of drilling machines 11 and core boring machines 31.

  Since the drilling machine 11 requiring a large power is larger than the core boring machine 31, when the plurality of drilling machines 11 and the core boring machine 31 are used, the core boring machine 31 which requires only a small power and requires only By using more than the drilling machine 11, the drilling machine 11 and the core boring machine 31 can be appropriately arranged in the narrow furnace body 2, and the pig iron 5 can be cut smoothly.

  As shown in FIG. 11, the pig iron cutting method for a blast furnace according to the present embodiment, in short, arranges the through holes 7 x by the drilling machine 11 and the through holes 7 y by the core boring machine 31 alternately, and adjoins these through holes. A cutting step for forming the holes 7x and 7y so as to communicate with each other is included.

  That is, first, a certain number of through-holes 7x are formed first by the drilling machine 11, and thereafter, while the through-holes 7x are continuously formed, the through-holes 7x are formed by the core boring machine 31 in a follow-up manner. A through-hole 7y is formed between them. Even though the core boring machine 31 has a lower efficiency than the drilling machine 11, a large number of through holes 7y can be simultaneously formed by a large number of core boring machines 31, so that a plurality of through holes 7x by the drill bit 16 are provided. Is formed in advance. Ideally, the core boring machine 31 and the drilling machine 11 work in parallel, and all the steps are completed just before the core boring machine 31 catches up.

  Thereby, the pig iron 5 can be line-cut by the through holes 7x and the through holes 7y arranged alternately. At this time, as shown by an arrow Q in FIG. 11, the form of the line cut is not limited to a straight line but may be a broken line or a curved line by making an angle between the adjacent through holes 7x and 7y. Good.

  The method for cutting pig iron in a blast furnace according to the present embodiment will be described in more detail. In the cutting step, a drilling machine 11 drills a pair of through-holes 7x at an interval Z that is equal to or less than the diameter W of the core bit 32. (1) a boring step, a core boring step of forming one through hole 7y communicating with the through holes 7x between the pair of through holes 7x by the core boring machine 31, and any of the through holes already formed. A second drilling step of drilling another through-hole 7x paired with the through-hole 7x with a drilling machine 11 at an interval Z from the diameter 7x of the diameter W of the core bit 32 or less. When the core boring process is completed, the start of the core boring process is repeated.

  First, in the first drilling step, among the through holes 7 that are continuously formed and line-cut the pig iron 5, the first through hole 7x is used as the through hole 7x for inserting the shaft 18 of the anchor portion 8. It is formed in advance by a drilling machine 11. When drilling with the drilling machine 11, by always pressing the pressing member 22 against the upper surface 5 a of the pig iron 5, the drilling reaction force can be transmitted to and supported by the pig iron 5. The through-hole 7x without bending can be formed at a high drilling speed.

  Next, the shaft body 18 provided with the fixing means 19 is integrally provided on the drilling machine 11 via the mounting bracket 17. Then, the shaft body 18 is inserted into the through hole 7x formed in advance by the working arm 10. The shaft 18 is fixed to the peripheral wall 7a inside the through hole 7 by the fixing means 19 of the shaft 18 inserted into the through hole 7x.

  The insertion depth of the shaft body 18 into the through hole 7x is set to a certain depth because the pig iron 5 remaining near the surface has many impurities and is brittle. Since the insertion depth can be determined from the reaction force and chips at the time of preceding formation, installation of the anchor portion 8 can be completed easily and in a short time without any trouble.

  By fixing the shaft body 18 to the through hole 7x, the boring machine 11, and eventually the crawler 9 on which the boring machine 11 is mounted, can be fixedly installed on the pig iron 5. Further, the anchor portion 8 can position the through hole 7x that is formed at a position separated by an interval Z equal to or smaller than the diameter W of the core bit 32 and that is paired with the previously formed through hole 7x. Further, in forming the pair of through holes 7x, the advance of the drilling rod 16 can be guided. At this time, the pressing member 22 is also pressed against the upper surface 5a of the pig iron 5.

  At this time, the shaft body 18 is fixed inside the through hole 7x below the pig iron upper surface 5a, while the drill bit 16 is located above the pig iron upper surface 5a. When the shaft body 18 is fixed inside the through hole 7x, the drilling operation by the drill bit 16 is started to form the pair of through holes 7x. The drilling operation is performed by moving the rotary drive unit 13 toward the pig iron 5 by the moving mechanism 14 while rotating the drill bit 16 via the drill rod 15 by the rotary drive unit 13 of the drilling machine 11. Do.

  When forming a pair of through-holes 7x in the pig iron 5 with the drilling bit 16, drilling reaction forces such as thrust and torque transmitted to the drilling machine 11 via the drilling rod 15 are generated by the anchor portion. 8, that is, the shaft 18 fixed to the through-hole 7 by the fixing means 19 is transmitted to and supported by the pig iron 5.

  As described above, since the drilling reaction force is transmitted to and supported by the pig iron 5 by the anchor portion 8, the swinging motion generated in the drilling machine 11 and the crawler 9 including the same can be suppressed. The inclination of the crawler 9 can be prevented.

  Further, since the shaft body 18 is arranged at a distance Z from the drilling rod 15 that is equal to or less than the diameter W of the core bit 32 which is substantially one through-hole, a position where drilling reaction force is generated (the drilling rod 15). ) And the fixing position (the shaft body 18) that resists the drilling reaction force, the stress applied to the drilling machine 11 including the crawler 9 can be reduced, and the drilling reaction can be efficiently and stably performed. Can withstand power. The swinging motion of the drilling machine 11 and the crawler 9 can also be suppressed by the pressing member 22.

  Accordingly, the through-hole 7x formed by the drilling machine 11 can be formed with high positional accuracy and without bending of the hole, and at the same time, the operation can be performed at a high drilling speed, and the through-hole 7x can be stably formed. It can be formed efficiently. Further, since the through holes 7x can be formed stably, the through holes 7x,... Which are continuously provided can be formed at accurate positions, and when the through holes 7x and 7y are continuously formed together with the core boring machine 31, the through holes 7x are formed. By making the amount of overlap between 7x and 7y small, the number of formed through holes 7x and 7y can be reduced, and the construction efficiency can be improved.

  Next, in the core boring step, a through hole 7y is formed between the pair of through holes 7x formed by the drilling machine 11 by the core bit 32 of the core boring machine 31. The cutting operation by the core bit 32 is performed by rotating the core bit 32 via the core tube 39 by the motor unit 37 of the core boring machine 31 and by moving the motor unit 37 toward the pig iron 5 by the arm unit 35 operated by the operation handle 36. It is done by moving forward.

  When cutting the pig iron 5 with the core bit 32, the core boring machine 31 can cut the pig iron 5 with low power, so that the reaction force generated in the cutting operation is small, and the core body 40 remaining in the core tube 39 is cut from the inside. Since the core tube 39 is supported, the through-hole 7y formed by the core boring machine 31 can be formed with high positional accuracy and without bending, and the through-hole 7y can be formed stably and efficiently.

  Further, since the through holes 7y can be formed stably, the through holes 7y,... Connected continuously can be formed at accurate positions, and even the core boring machine 31 reduces the amount of overlap between the through holes 7x, 7y. , Construction efficiency can be improved.

  In particular, by making the diameter W of the core bit 32 larger than the outer diameter J of the drill bit 16, the number of through holes 7x formed by the drilling machine 11 can be reduced. The drilling machine 11 requires a larger power than the core boring machine 31 and uses a larger device. Therefore, by using a large number of core boring machines 31, the number of through holes 7x by the drilling machine 11 is reduced. As a result, the pig iron 5 can be line cut with high construction efficiency. The core boring machine 31 may be provided with an anchor portion 8 similar to that provided in the drilling machine 11 (see FIG. 9). In this case, at the beginning of the core boring step, a step similar to the second drilling step is performed.

  Next, in the second drilling step, one of the through-holes 7x formed by the drilling machine 11 before that and another through-hole 7x that is paired with the through-hole 7x are In a state where the position of the through hole 7y to be cut is opened, a hole is drilled by the drill bit 16 of the drilling machine 11 using the anchor portion 8 described above. That is, the shaft 18 is inserted into the already formed through hole 7x to newly form the through hole 7x.

  Then, the core boring process is completed when the second boring process is completed so that the core boring machine 31 forms a through hole 7y in a follow-up manner between the through holes 7x formed by the paired drilling machines 11 at all times. Start to repeat.

  Regarding the drilling machine 11, every time a new through-hole 7x is provided, the through-hole 7x for fixing the shaft 18 of the anchor portion 8 is shifted so that the drilling machine 11 continues to form a new through-hole 7x. The core boring machine 31 is moved to the position each time the through-hole 7x is formed in a pair, and continues to form 32 new through-holes 7y with the core bit, so that the pig iron 5 Can be formed continuously by forming through holes 7x and 7y penetrating through. At this time, even if the core body 40 remains in the through hole 7y formed by the core boring machine 31, the pig iron 5 is completely line-cut.

  The core body 40 remaining in the through hole 7y is extracted from the through hole 7y as necessary. Withdrawal can be performed by welding a suspending tool to the upper end of the core body 40 and lifting the core body 40 by a heavy machine through the suspending tool.

  As described above, in the method for cutting pig iron of the blast furnace according to the present embodiment, the core body 40 remains in comparison with the case of performing only with the drilling machine 11 or the case of performing only with the core boring machine 31. The through-holes 7x and 7y are continuously formed by the drilling bit 16 of the drilling machine 11 that can form the through-hole 7x without performing the drilling and the core bit 32 of the core boring machine 31 that can complete the cutting in a short time with small power. And the line of the pig iron 5 can be efficiently cut.

  This is a pig iron cutting method in which the drilling machine 11 is mainly used and the core boring machine 31 is used in an auxiliary manner. The core boring machine 31 can be used in places where drilling is difficult. For example, when the distance between the through holes is about 5 mm and drilling with a drill bit is difficult, the core boring machine 31 can be used. In addition, even when the through hole is wrapped near the pig iron surface, the remaining portion of the through hole that has been separated from the middle can be drilled by the core boring machine 31. Furthermore, the core boring machine 31 can drill holes even at a position where the drilling machine 11 cannot be installed, such as the outer periphery of the furnace.

  The present invention is not limited to the contents specifically described in the above-described embodiments, and can be appropriately changed within the scope described in the claims. For example, the pressing member 22 may not be provided. Further, even if the shaft body 18 of the anchor portion 8 is arranged away from the drilling rod 15 by a diameter equal to or greater than the diameter of the through hole 7x, for example, the shaft body 18 and the drilling rod 15 may have two or three through holes 7x and 7y. They may be arranged at intervals such that they straddle one another, and the intervals may be adjustable.

DESCRIPTION OF SYMBOLS 1 Blast furnace 2 Furnace body 5 Pig iron 7,7x, 7y Through hole 11 Drilling machine 15 Drilling rod 16 Drilling bit 31 Core boring machine 32 Core bit 39 Core tube 40 Core body J Outer diameter of drilling bit W Core bit diameter Z Interval less than core bit diameter

Claims (3)

A blast furnace pig iron cutting method for continuously forming a through hole through the pig iron remaining inside the furnace body of the blast furnace and line cutting the pig iron,
A drilling machine for drilling a drilling rod with a drilling bit provided at the tip thereof toward the pig iron while rotating and driving the drilling rod to form a first through hole by drilling the pig iron with the drilling bit; and a core bit. Using a core boring machine for rotating the core tube provided at the tip toward the pig iron while driving the same, cutting the pig iron with the core bit and forming a second through hole,
The first through holes formed by the drilling machine and the second through holes formed by the core boring machine are alternately arranged, and the first and second through holes adjacent to each other are formed so as to communicate with each other. A method for cutting pig iron in a blast furnace, comprising a cutting step. The cutting step includes:
A drilling step of drilling a plurality of the first through holes with the drilling machine at an interval equal to or less than the diameter of the core bit;
A core boring step of forming the second through holes communicating with the first through holes with the core boring machine between the first through holes;
The method according to claim 1, wherein the drilling step is performed first, and then the core boring step is performed in parallel with the drilling step.   The pig iron cutting method for a blast furnace according to claim 1 or 2, wherein the diameter of the core bit is larger than the outer diameter of the drill bit.

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