JP2008240118A - Taphole opening apparatus and taphole closing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a taphole opening apparatus which can efficiently perform a restoring work of a blast furnace after a temperature drop thereof. <P>SOLUTION: The taphole opening apparatus 30 includes a drifter 31 as a drill, a guide cell 34 that advanceably and retractably guides the drifter 31 along the drilling direction, and a supporting frame 36 that simultaneously pivotally supporting and lifting the rear part of the guide cell 34 through a lift rod 38. The rear end of the guide cell 34 is rotatably linked to one end of a first actuator 40 capable of performing extension and contraction actuation, and the other end of the first actuator 40 is rotatably linked to the rear end of the supporting frame 36. The contraction actuation of the first actuator 40 turns the guide cell 34 about a pivot shaft 39 to direct the drifter 31 toward a region 5 for ordinary taphole to open an ordinary taphole 15. The extension actuation of the first actuator 40 turns the guide cell 34 about the pivot shaft 39 to direct the drifter 31 toward a region 7 for temporary taphole to open a temporary taphole 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sprue opening device for opening a sprue opening of a blast furnace, and a sprue port closing device for closing the opened spout.

  In general, blast furnace operation is performed as follows. Iron ore and coke are charged into the furnace from the top of the furnace, and hot air or auxiliary fuel is blown in addition to the tuyere arranged at the bottom of the furnace. As a result, coke and auxiliary fuel are converted into high-temperature reducing gas and rise in the furnace. The iron ore charged and lowered from the upper part of the furnace is heated and reduced to become a metallic state and become hot metal, and its gangue component becomes hot metal (slag) and is stored in the hearth. Since the specific gravity of the hot metal is smaller than the specific gravity of the hot metal, it is stored in a state of being stacked on the hot metal. Then, the spout is opened, the hot metal is extracted therefrom, and the spout is closed after completion of the spout. Usually, such an operation is repeated and the operation is continued.

  By the way, in blast furnace operation, the cooling panel, stave cooler, or tuyere that cools the furnace body and bricks of the blast furnace is damaged, and a large amount of water enters the furnace or is generated in the furnace wall. As a result of a large amount of charging due to falling off of the attached deposits or mistakes of iron ore charging, there may be a sudden shortage of furnace heat. In this case, the hot metal stored in the furnace is gradually solidified, so that it becomes impossible to perform normal extraction. Furthermore, since air cannot be blown from the tuyere and the amount of blown air rapidly decreases, the hot metal may flow back to the tuyere and eventually to the blower branch and solidify, which may make it impossible to blow. Such a situation is generally called blast furnace cooling, and when this occurs, it is necessary to melt the molten iron solidified in the furnace and flow it out of the furnace. This restoration work takes a long time.

  FIG. 7 is a longitudinal sectional view of the lower part of the blast furnace schematically showing a state in which the molten iron solidified in the furnace is melted by the cooling of the blast furnace.

  As shown in FIG. 1, a furnace body 1 of a blast furnace is configured such that a furnace wall 2 and a furnace bottom 3 corresponding to the inside of the blast furnace are made of a refractory material such as brick, and the outside of the furnace wall 2 is covered with an iron skin 4. In the furnace body 1, a region 5 in which a tap hole 15 (hereinafter sometimes referred to as “normal tap port”) is to be formed at a position approximately the same height as the cast floor 8 at the time of normal taping. (Hereinafter, sometimes referred to as “normal outlet area”) is provided in advance.

  The plugging material (mud) is made from chamotte, clay, coke powder or the like as a main material, and kneaded with silicon carbide or fused alumina added thereto. A plurality of such normal taphole regions 5 are arranged at predetermined intervals in the circumferential direction of the furnace body 1.

  The casting floor 8 is provided with a ridge 9 corresponding to each normal shed area 5. Each hot metal 9 receives the hot metal flowing out from the normal hot metal outlet 15 of each normal hot metal outlet region 5 and separates it into hot metal and hot metal, and then guides the hot metal to a dedicated processing facility. It plays a role of leading to hot metal transport vehicles such as torpedo cars for steelmaking processing.

  Also, the furnace body 1 is provided with a tuyere portion 61 vertically above the normal taphole region 5. The tuyere portion 61 is provided with a tuyere 6 shown in FIG. The tuyere 6 penetrates through the iron skin 4 and the furnace wall 2 and projects into the furnace body 1. The tuyere 6 is connected to a blow pipe 11 from a blower branch pipe 10 connected to a hot air blower facility as shown in FIG. Around the tuyere 6, a tuyere cooling box 12 and a stave cooler 13 for cooling the tuyere 6 and the blow pipe 11 are provided. A plurality of such tuyere 6 are arranged at predetermined intervals in the circumferential direction of the furnace body 1. A tuyere replacement deck 14 is installed around the furnace body 1 at a position slightly lower than the tuyere 6 position.

  Further, the furnace body 1 has a temporary outlet 16 (hereinafter sometimes referred to as a “temporary outlet”) between each normal outlet area 5 and the tuyere 6 immediately above it. A region 7 to be formed (hereinafter, sometimes referred to as “temporary exit area”) is provided in advance.

  In such a blast furnace, when chilling occurs, generally, a normal outlet 15 similar to that during normal extraction is opened in the normal outlet area 5 for the solidified molten iron, and immediately above it. The tuyere portion 61 where the tuyere 6 is disposed is opened. Then, iron pipes 18 and 19 are inserted from the outside into the normal spout 15 and the tuyere 61, respectively, and oxygen is fed into the iron pipes 18 and 19, respectively. Then, the tips of the iron pipes 18 and 19 are combusted, and the solidified hot metal in the vicinity thereof is sequentially melted by the combustion heat. As a result, when the normal spout 15 communicates with the tuyere 61 directly above it, hot air is blown into the furnace from the tuyere 61, and the solidified hot metal in the furnace is generated by the combustion heat of the coke in the furnace by the hot air. Normally, the candy is gradually discharged from the brewing port 15 while dissolving.

  Of course, when the normal spout 15 and the tuyere 61 just above it cannot communicate, the temporary spout 16 is provided in the temporary spout area 7 between the normal spout 15 and the tuyere 61. In the sense that it is between the normal outlet 15 and the tuyere 61, the temporary outlet 17 is opened directly above the normal outlet 15 in the same normal outlet area 5. Or make holes. Then, the iron pipes 20 and 21 for passing oxygen are also inserted into the temporary outlets 16 and 17, and first, the temporary outlets 16 and 17 and the tuyere 61 are connected to each other. Hot metal is allowed to flow out of the mouths 16 and 17. The hot metal flowing out from the temporary outlets 16 and 17 is processed by using a small temporary tub (not shown) separately from the permanent tub 9.

  As a technique for melting the molten iron solidified in the furnace, a technique of inserting a plasma torch instead of the iron pipes 18, 19, 20, 21 has also been proposed (see, for example, Patent Document 1). In this method, both the anode and the cathode are provided at the tip of each torch, and the solidified molten iron is melted by a plasma arc generated between the two electrodes. Further, when the distance between the tips of both torches is close, such as the torch inserted in the temporary tap 16 and the tuyere 61 just above it, the tip of one torch has an anode and the other You may make it have a cathode at the front-end | tip of a torch.

JP-A-5-255717

  In this way, recovery work is performed when the blast furnace has cooled down, and the opening of the tap hole at that time is conventionally made by a tap hole opening device as described below.

  FIG. 8 is a side view of a conventional tap hole opening device. As shown in the figure, a conventional spout opening device 130 includes a drifter 131 that is a drilling machine, a guide cell 134 that guides and supports the drifter 131 so as to advance and retreat along the direction in which the drifter 131 is drilled, and the guide cell. And a generally horizontal support frame 136 that lifts the rear portion of 134 through a pair of lifting links 138,139.

  The drifter 131 moves forward and backward while being guided by the guide cell 134 by the driving force from the motor 135 fixed on the guide cell 134. From the front end of the drifter 131, a rod 132 for driving rotation and striking extends in the advancing and retreating direction of the drifter 131, and a bit 133 is attached to the tip of the rod 132.

  The lifting links 138 and 139 are arranged at predetermined intervals in the advancing / retreating direction of the drifter 131, and the upper and lower ends thereof are rotatably connected to the support frame 136 and the guide cell 134, respectively. The lifting link 139 on the backward direction side of the drifter 131 is shorter in length than the lifting link 138 on the forward direction side of the drifter 131, and the wire 140 is positioned closer to the guide cell 134 on the lifting link 139 on the backward direction side. It is connected. The wire 140 is wound around a drum of a winding motor 142 that is fixed on the support frame 136 and can be rotated in the forward and reverse directions via a pulley 141 provided at the rear end of the support frame 136.

  When the wire 140 is wound up, as shown by the broken line in FIG. 8, the lifting link 139 on the backward direction side is turned up with the upper end as a fulcrum and tilted downward from the vertical downward direction. In conjunction with this, the lifting link 138 on the forward direction side rotates with the upper end as a fulcrum, and is inclined downward from the vertical direction downward. As a result, the guide cell 134 is placed in a standby position shifted rearward from the opening position in a posture in which the front portion is inclined downward from the horizontal.

  On the other hand, when the wire 140 is unwound, as shown by the solid line in FIG. 8, the lifting link 139 on the backward direction side and the lifting link 138 on the forward direction side have their upper ends pushed by the weight of the guide cell 134 including the drifter 131. Rotate to the fulcrum and enter a vertically downward state. As a result, the guide cell 134 is placed from the standby position to the front opening position in a posture in which the front portion is inclined downward from the horizontal.

  The support frame 136 is coupled to a turning beam (not shown) from a support column (not shown) erected on the casting floor 8. By rotating the swivel beam with respect to the support column, the drifter 131 and the guide cell 134 integrated with the support frame 136 are moved away from the front of the normal outlet port area 5 (in FIG. 8, perpendicular to the paper surface). And a standby position and an opening position in front of the normal tap mouth area 5.

  The spout opening device 130 having such a configuration is used when the normal spout 15 is opened in the normal spout opening region 5. At that time, the drifter 131 and the guide cell 134 integrally with the support frame 136 are first placed in the standby position in front of the normal spout area 5. When the wire 140 is unwound from here, the drifter 131 and the guide cell 134 reach the opening position. In this state, the hacker portion 143 protruding from the front end portion of the guide cell 134 is engaged with the hacker receiver 144 fixed to the furnace body 1, and the bit 133 at the tip of the rod 132 from the drifter 131 is used for a normal outlet. It will be in the state arrange | positioned in the immediate vicinity of the area | region 5. FIG.

  Then, while rotating the rod 132 of the drifter 131, the drifter 131 is moved forward with respect to the guide cell 134 according to the driving of the motor 135 while giving a striking force to the rod 132 in some cases. As a result, the bit 133 enters the normal taphole region 5 at a constant drilling angle inclined downward from the horizontal, and as a result, the position inside the furnace body 1 is here more than the outside position. The lower normal spout 15 is opened.

  However, in such a conventional spout opening device 130, the temporary spout 16 is opened in the temporary spout area 7 between the normal spout opening area 5 and the tuyere 6 immediately above it. It cannot be perforated. Further, a temporary spout opening 17 having a perforation angle different from that of the normal spout opening 15, for example, a horizontal or upward inclined perforation angle, is opened in the normal spout opening area 5 immediately above the normal spout opening 15. It is not possible. Depending on the rotation angle of the lifting links 138, 139, the positioning of the perforation in the normal spout opening region 5 and the perforation angle inclined downward from the horizontal are unique so as to match the opening of the normal spout opening 15. It is because it is set to.

  Therefore, conventionally, in order to open the temporary outlets 16 and 17, a temporary outlet opening device is necessary in addition to the conventional outlet opening device 130 described above.

  However, since the conventional spout opening device 130 and the tuyere replacement deck 14 are installed around the normal spout opening area 5 and the temporary spout opening area 7, there is enough space. I can't say that there is. For this reason, it is difficult to install a large tap opening device that can exhibit sufficient capability according to the conventional tap opening device 130 as a temporary tap opening device. Moreover, in combination with the fact that the opening work of the temporary taps 16 and 17 is not performed regularly in normal blast furnace operation, a small and versatile tap hole opening device is brought in manually. I had to open a hole in

  In the above-described conventional tap opening device 130, a high-performance and stable hydraulic type is generally used for the drifter 131 as a driving source for the drilling, which is currently rare and expensive. For this reason, it is difficult to employ a hydraulic one as a temporary tap opening device for opening the temporary tap openings 16 and 17. If a hydraulic one is adopted as a temporary outlet opening device, a method of holding the weight of the outlet opening device itself, a method of retracting the outlet opening device at the time of extraction, Since the hydraulic piping is temporary, the heat insulation method for the hydraulic piping must be taken into consideration, and there are many problems from the viewpoint of safety (fire, personal injury).

  As a result, in order to carry out recovery work when the blast furnace has cooled down, it is first necessary to open the tapholes, especially at the temporary tapholes 16 and 17. However, it is complicated and time consuming, and it cannot be said that the properties such as the shapes and dimensions of the temporary spouts 16 and 17 opened are not good. The properties of the temporary outlets 16 and 17 affect whether or not the subsequent insertion of the iron pipes 20 and 21 and the plasma torch can be smoothly performed, and further solidify by the iron pipes 20 and 21 and the plasma torch. It also affects the hot metal heating conditions.

  Subsequently, the opening of the spout opening that has been opened is conventionally performed by a spout closing apparatus as described below.

  FIG. 9 is a side view of a conventional spout closing device. As shown in the figure, a conventional spout opening closing device 150 has a mud gun 151 and a shaft that can rotate from a horizontal posture at a standby position to a posture at a closed position in which the front portion is inclined downward. A support frame 153 to be supported and an actuator 154 for supporting the support frame 153 and moving it back and forth in the horizontal direction are provided. As the actuator 154, a hydraulic type is adopted.

  The mud gun 151 accommodates a blocking material inside the cylinder, and pushes the blocking material from the nozzle 152 at the front end of the cylinder as the piston moves inside the cylinder. The driving is generally performed by hydraulic pressure.

  The actuator 154 that supports the support frame 153 is coupled to a turning beam (not shown) from a column (not shown) that is erected on the casting floor 8. The support column and the swivel beam are different from those of the conventional tap opening device 130 described above. By turning the turning beam with respect to the support column, the mud gun 151 and the support frame 153 are integrated with the actuator 154 so that the mud gun 151 and the support frame 153 are moved away from the front of the normal spout opening area 5 (in FIG. 9, a direction perpendicular to the paper surface). And a standby position and a closed position in front of the normal spout opening area 5.

  The sprue port closing device 150 having such a configuration is used when closing the normal spout port 15 opened in the normal spout port region 5. At that time, the mud gun 151 and the support frame 153 are first placed in the standby position in front of the normal spout opening area 5 integrally with the actuator 154. When the actuator 154 advances forward in the horizontal direction from here, the mud gun 151 and the support frame 153 advance, and in conjunction with this, the mud gun 151 rotates about the support shaft 155 with respect to the support frame 153 as a horizontal axis. It reaches the closed position in a posture in which the front part is inclined downward. In this state, the advance output of the actuator 154 acts and the nozzle 152 of the mud gun 151 is pressed so as to be in close contact with the normal spout 15.

  Then, the piston of the mud gun 151 is driven. As a result, the closing material is pushed out from the nozzle 152 and is press-fitted into the normal outlet 15, and as a result, the normal outlet 15 is completely filled with the closing material and closed.

  However, in such a conventional tap outlet closing device 150, during a series of recovery operations when the blast furnace cools down, a temporary between the normal tap mouth region 5 and the tuyere 6 immediately above it is provided. The temporary spout 16 opened in the spout area 7 cannot be closed. In addition, the temporary spout 17 opened in the normal spout area 5 directly above the normal spout 15 cannot be closed. By rotating the mud gun 151 in conjunction with the advancement of the actuator 154, the positioning of the nozzle 152 of the mud gun 151 to the normal outlet 15 is uniquely set so as to meet the blockage of the normal outlet 15. Because.

  Therefore, conventionally, in order to close the temporary spouts 16 and 17, a temporary spout closing device is required in addition to the conventional spout closing device 150 described above.

  However, since the conventional spout closing device 150 and the tuyere replacement deck 14 are installed around the normal spout opening area 5 and the temporary spout opening area 7, there is enough space. I can't say that. For this reason, it is difficult to install a large-sized tapper closing device capable of exhibiting sufficient capability according to the conventional tapper closing device 150 as a temporary tapper closing device. Moreover, coupled with the fact that the temporary closing of the outlets 16 and 17 is not performed regularly in normal blast furnace operation, a small and versatile outlet opening closing device is brought in manually. The obstruction work was forced.

  Note that, in the above-described conventional spout closing device 150, the pressing force of the nozzle 152 to the normal spout 15 according to the advance output of the actuator 154 is as large as about 294 kN to 490 kN (30 to 50 ton-f). In fact, it is equipped with a base (base) that receives the reaction force. However, a space for receiving the reaction force and the like is further provided for a temporary port opening closing device for closing the temporary port 16 and 17. Since it cannot be secured, it can be said that it is difficult to install a large spout closing device.

  As a result, when the blast furnace is cooled down, it is necessary to close the opened tapholes, especially when the temporary tapouts 16 and 17 are closed. It is cumbersome and time consuming, and the state of the closed temporary entrances 16 and 17 cannot be said to be good. If the closed temporary entrances 16 and 17 are in a bad state, it may cause trouble in normal operation after recovery.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a tap opening device and a tap opening closing device that can efficiently perform a recovery operation when the blast furnace has cooled down. To do.

  In order to achieve the above object, the tap hole opening device according to the present invention is provided between the normal tap hole area provided in the blast furnace body or the tuyere directly above the normal tap hole area. A spout opening device for punching a plurality of spouts at different positions in the height direction in at least one of the temporary spout spout areas, comprising a perforator and a direction for perforating the perforator A guide cell that guides and supports the guide cell so as to advance and retreat along, and a support frame that supports the guide cell. And the attitude | position adjustment mechanism which adjusts the attitude | position in the height direction of the said guide cell was provided in the support part of the said guide cell and the said support frame. With such a configuration, a plurality of tap holes having different heights can be opened in the normal tap port region or the temporary tap port region.

  Here, particularly from the viewpoint of safety, it is preferable that the posture adjusting mechanism includes a hydraulic, electric, or pneumatic actuator that is driven by remote operation.

  In order to achieve the above object, the taphole closing device according to the present invention is provided between the normal tapout area provided in the blast furnace body or the tuyere directly above the normal tapout area. A spout closing device that closes a plurality of spouts that are different from each other in the height direction and that is formed in at least one of the provided temporary spout opening regions, and a mud gun and a support that supports the mud gun A frame. And the attitude | position adjustment mechanism which adjusts the attitude | position in the height direction of the said mud gun was provided in the support part of the said mud gun and the said support frame. By adopting such a configuration, it is possible to close a plurality of tap holes having different heights opened in the normal tap hole region or the temporary tap port region.

  Here, particularly from the viewpoint of safety, it is preferable that the posture adjusting mechanism includes a hydraulic, electric, or pneumatic actuator that is driven by remote operation.

  Further, in order to effectively close each tap hole, it is preferable that the nozzle of the mud gun can be replaced with a nozzle having a different tip height.

  According to the tap hole opening device of the present invention, when performing recovery work when the blast furnace has cooled down, it is possible to open a plurality of tap holes having different heights by simply installing one unit. Since this is possible, the opening work is much easier, and the time required is shorter. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  In addition, according to the tap opening closing device of the present invention, when carrying out recovery work when the blast furnace has cooled down, it is necessary to install a plurality of tap spouts with different heights by simply installing one unit. Since it can be closed, the closing operation is remarkably simple, and the required time is also short. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the tap hole opening apparatus which is 1st Embodiment of this invention is demonstrated.

  FIG. 1 and FIG. 2 are side views of the tap hole opening device according to the first embodiment. FIG. 1 shows a situation in which a normal tap hole is opened in the normal tap hole region. 2 shows a situation in which a temporary outlet is opened in the temporary outlet area. In addition, since the structure of the blast furnace itself is the same as that shown in FIGS. 7 to 9, the same reference numerals are given to the portions, and duplicate descriptions are omitted. The same applies to the second to fourth embodiments described later.

  As shown in FIGS. 1 and 2, the spout opening device 30 of the first embodiment includes a drifter 31 that is a drilling machine, and a rigidity that guides and supports the drifter 31 so as to advance and retract along the direction of drilling the drifter 31. Guide cell 34, a substantially horizontal rigid support frame 36 that lifts the rear portion of the guide cell 34 via a rigid lifting rod 38, and an actuator 37 that supports the support frame 36 and advances and retracts in the horizontal direction. Is provided. The actuator 37 is preferably a hydraulic type. However, it may be an electric type or a pneumatic type.

  The drifter 31 moves forward and backward while being guided by the guide cell 34 by the driving force from the motor 35 fixed on the guide cell 34. From the front end of the drifter 31, a pipe-shaped rod 32 for driving rotation and striking extends in the advancing and retreating direction of the drifter 31, and a bit 33 of a drilling tool is attached to the tip of the rod 32.

  Here, the guide cell 34 is pivotally supported by a lower end portion of a lifting rod 38 that protrudes the rear portion vertically downward from the support frame 36, and is rotatable about the support shaft 39. The upper end portion of the lifting rod 38 is fixed to the support frame 36.

  Further, one end of a first actuator 40 that can be extended and contracted is rotatably connected to the rear end of the guide cell 34, and the other end of the first actuator 40 is connected to the rear end of the support frame 36. The unit is pivotally connected to the part. Thus, the lifting rod 38 and the first actuator 40 are arranged in order from the forward direction side to the backward direction side along the forward / backward direction of the drifter 31, and the guide cell 34 including the drifter 31 includes the lifting rod 38 and the first actuator 40. It is in a state where it is supported while its posture is determined.

  The actuator 37 that supports the support frame 36 is coupled to a turning beam (not shown) from a column (not shown) that is erected on the casting floor 8. By rotating the swirling beam with respect to the support column, the drifter 31, the guide cell 34, and the support frame 36 integrally with the actuator 37 are removed from the front of the normal spout opening area 5 and the temporary spout opening area 7. The retracted position (the position deviated in a direction perpendicular to the paper surface in FIGS. 1 and 2), and the standby position and the closed position in front of the normal outlet area 5 and the temporary outlet area 7 are provided. it can.

  The spout opening device 30 configured as described above is provided not only when the normal spout opening 15 is opened in the normal spout opening area 5 but also in the temporary spout opening area 7. It is also used when opening holes.

  When the normal spout 15 is opened in the normal spout opening area 5, the drifter 31, the guide cell 34, and the support frame 36 are first integrated with the actuator 37 as shown in FIG. A standby position in front of area 5 is placed.

  Next, the first actuator 40 is driven to contract, and accordingly, the guide cell 34 and the drifter 31 rotate so that the rear end can be lifted with the support shaft 39 as a fulcrum. As a result, the guide cell 34 and the drifter 31 are placed in a posture in which the front part is inclined downward from the horizontal. The inclination angle of this posture coincides with the drilling angle of the normal taphole 15 inclined downward from the horizontal.

  From here, the actuator 37 advances forward in the horizontal direction, so that the drifter 31, the guide cell 34, and the support frame 36 reach the opening positions. In this state, the hacker portion 41 protruding from the front end portion of the guide cell 34 engages with the first hacker receiver 42 fixed to the furnace body 1, and the bit 33 at the tip end of the rod 32 from the drifter 31 normally protrudes. It will be in the state arrange | positioned in the immediate vicinity of the area | region 5 for mouths.

  Then, while rotating the rod 32 of the drifter 31, and in some cases, further applying a striking force to the rod 32, the drifter 31 is advanced relative to the guide cell 34 according to the drive of the motor 35. As a result, the bit 33 enters the normal tap hole area 5 at a constant drilling angle inclined downward from the horizontal, and as a result, the position inside the furnace body 1 is here rather than the outside position. The lower normal spout 15 is opened.

  On the other hand, when opening the temporary outlet 16 in the temporary outlet area 7, as shown in FIG. 2, as in the case of opening the normal outlet 15, the actuator 37 is integrated with the actuator 37. The drifter 31, the guide cell 34, and the support frame 36 are first placed in a standby position in front of the temporary outlet area 7.

  Next, the first actuator 40 is driven to extend, and accordingly, the guide cell 34 and the drifter 31 rotate so that the rear end portion can be pushed down with the support shaft 39 as a fulcrum. As a result, the guide cell 34 and the drifter 31 are placed in a posture in which the front part is inclined upward from the horizontal. The inclination angle of this posture coincides with the drilling angle of the temporary tap 16 that is inclined upward from the horizontal.

  From here, as in the case of opening the above-mentioned normal spout 15, the actuator 37 advances forward in the horizontal direction, so that the drifter 31, the guide cell 34 and the support frame 36 reach the opening position. In this state, the hacker portion 41 from the guide cell 34 engages with the second hacker receiver 43 fixed to the furnace body 1, and the bit 33 at the tip of the rod 32 from the drifter 31 is a temporary outlet area. 7 is placed in the immediate vicinity.

  Then, in the same manner as when the normal spout 15 is opened, while the rod 32 of the drifter 31 is rotated, and in some cases, the rod 32 is given a striking force, the guide cell 34 is driven according to the drive of the motor 35. On the other hand, the drifter 31 is moved forward. As a result, the bit 33 enters the temporary outlet area 7 at a constant drilling angle inclined upward from the horizontal, and as a result, the position inside the furnace body 1 is here rather than the outside position. A higher temporary outlet 16 is opened.

  Thus, according to the tap hole opening device 30 of the first embodiment, the normal tap hole 15 can be opened in the normal tap hole region 5, and the normal tap port region 5. It is also possible to open a temporary outlet 16 in the temporary outlet area 7 between the upper and lower tuyere 6. In other words, it is possible to make a connection between the opening of the normal spout 15 and the opening of the temporary spout 16. This is because the guide cell 34 that guides and supports the drifter 31 is supported by the lifting rod 38 and the first actuator 40 with respect to the support frame 36, and rotates around the support shaft 39 according to the expansion and contraction of the first actuator 40. This is because the positioning of the hole and the hole angle can be adjusted so as to correspond to the openings of the normal dock 15 and the temporary dock 16.

  As a result, when performing recovery work when the blast furnace cools down, the normal tap port 15 and the temporary tap port 16 can be opened by a single permanent tap port opening device 30. Therefore, as compared with the case of using a more conventional sprue opening device as in the prior art, the opening operation is much simpler and the time required is shorter. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  After the normal outlet 15 and the temporary outlet 16 are opened, the iron pipe 18 is connected from the tuyere 61, the normal outlet 15 and the temporary outlet 16 in the same manner as shown in FIG. 19, 20 and a plasma torch are inserted to melt the molten iron solidified in the furnace.

  The first actuator 40 is preferably a hydraulic, electric, or pneumatic actuator that is driven by remote operation. This is because if the remote control can be performed, work near the apparatus is eliminated, which is particularly advantageous in terms of safety. However, the frequency with which the blast furnace cools down, that is, the frequency with which the temporary tap 16 needs to be opened, cannot be predicted. Judging from the balance of In particular, from the viewpoint of controllability, it is desirable to employ a hydraulic or electric type.

  Further, as the drifter 31 serving as a driving source for drilling, it is preferable to adopt a hydraulic type that has a high capability and is stable. The reason will be described below.

  Table 1 shows an example of the evaluation test result. Here, the test which opens a sprue opening was carried out using the thing of the hydraulic type and the pneumatic type for the drifter 31 in the sprue opening apparatus 30.

  Here, a rod with a bit at the end of the pipe is used to open the hole at the time of unloading, but since the work involves digging a high-temperature refractory (mud), the bit is fixed in the hole while digging the refractory. There is a case. In that case, if the return is performed not only by forward strike but also by reverse strike, the hole opening operation proceeds smoothly, so that both forward strike and reverse strike are used. However, since the punching operation is not necessary for reverse striking, there is no rotation. The properties of the hole wall as an evaluation are determined by the index of “striking force x number of impacts” for striking and “rotation force x number of revolutions” for rotation. From the comparison of these indices, the hydraulic type is compared with the pneumatic type. It can be seen that it has an opening ability of about 1.5 to 2 times.

  The evaluation of the properties of the hole wall was defined as “excellent” when the opened hole was straight and straight with a uniform diameter over the entire length, and “poor” when the hole was bent or narrowed from the middle with a non-uniform diameter. . The hydraulic type was “excellent” and the pneumatic type was “poor”.

  Even when the hole wall is inferior, for example, when a hole having a diameter of 100 mm is required when the molten iron is melted by an iron pipe for oxygen transmission, the hole is opened. Eventually, only a hole having a diameter of 60 mm can be used effectively. In this case, the steel pipe with the planned diameter cannot be smoothly inserted, and if an iron pipe with a small diameter is inserted, the oxygen to be sent is reduced and the melting capacity of the hot metal is lowered. As a result, recovery from the blast furnace cooling is delayed.

  On the other hand, when the hole wall has a “excellent” shape, an iron pipe of the planned diameter can be smoothly inserted as it is. The As a result, the recovery from the blast furnace cooling is accelerated.

  Therefore, it is preferable to employ a hydraulic type drifter 31 in the tap hole opening device 30 from the viewpoint of more efficiently recovering from the blast furnace cooling.

  Next, a tap hole opening device according to a second embodiment of the present invention will be described with reference to FIG. The feature of the second embodiment is that the support structure of the guide cell 34 with respect to the support frame 36 in the first embodiment is modified so that the temporary outlet is located immediately above the normal outlet 15 in the normal outlet area 5. The point is that the hole 17 can be effectively opened.

  FIG. 3 is a side view of the tap hole opening device according to the second embodiment, and particularly shows a situation in which a temporary tap opening is opened directly above the normal tap opening in the normal tap opening area. Show.

  As shown in the figure, in the spout opening device 30 of the second embodiment, the lifting rod 38 in the first embodiment is replaced with a second actuator 44 that can be extended and retracted. That is, the guide cell 34 is pivotally supported by the lower end portion of the second actuator 44 whose rear end portion protrudes vertically downward from the support frame 36, and can rotate about the support shaft 39. The upper end portion of the second actuator 44 is fixed to the support frame 36.

  Thus, the second actuator 44 and the first actuator 40 are arranged in order from the forward direction side to the backward direction side along the forward / backward direction of the drifter 31, and the guide cell 34 including the drifter 31 includes the second actuator 44 and the first actuator 40. Through the actuator 40, the posture is supported while being determined.

  The spout opening device 30 having such a configuration opens the temporary spout 16 in the temporary spout region 7 when the normal spout 15 is opened in the normal spout region 5. In addition to the above, it is also used when the temporary spout 17 is opened directly above the normal spout 15 in the normal spout area 5.

  When opening the temporary outlet 17 directly above the normal outlet 15 in the normal outlet area 5, as shown in FIG. 3, the normal outlet 15 in the first embodiment described above and In the same manner as when the temporary outlet 16 is opened, the drifter 31, the guide cell 34 and the support frame 36 are first placed in the standby position in front of the normal outlet area 5 together with the actuator 37.

  Next, the second actuator 44 is driven to contract, and accordingly, the guide cell 34 and the drifter 31 are lifted vertically upward, and the support shaft 39 is also moved vertically upward. At the same time, the first actuator 40 is driven to extend, and accordingly, the guide cell 34 and the drifter 31 rotate so that the rear end portion can be pushed down with the support shaft 39 moved vertically upward. As a result, the guide cell 34 and the drifter 31 are in a substantially horizontal posture. The inclination angle of this posture coincides with the piercing angle of the horizontal temporary tap 17.

  From here, in the same manner as in the case of the opening of the normal taphole 15 and the temporary tapout port 16 in the first embodiment described above, the actuator 37 advances forward in the horizontal direction so that the drifter 31, the guide cell 34 and the support are supported. The frame 36 reaches the opening position. In this state, the hacker portion 41 from the guide cell 34 engages with the third hacker receiver 45 fixed to the furnace body 1, and the bit 33 at the tip of the rod 32 from the drifter 31 is a normal outlet area. 5 is placed in the immediate vicinity.

  Then, as in the case of opening the normal taphole 15 and the temporary tapout port 16 in the first embodiment described above, the rod 32 of the drifter 31 is rotated, and the striking force is further applied to the rod 32 in some cases. While being applied, the drifter 31 is moved forward with respect to the guide cell 34 according to the drive of the motor 35 (sometimes retracted temporarily). As a result, the bit 33 enters the normal spout opening area 5 at a horizontal, constant drilling angle, and as a result, the temporary position where the internal position of the furnace body 1 and the external position are approximately the same height. The spout 17 is opened.

  On the other hand, when opening the temporary outlet 16 to the normal outlet 15 or the temporary outlet area 7, the height of the support shaft 39 is set so that the temporary outlet 17 is opened to the normal outlet area 5. The second actuator 44 is driven so as to be lower than that at the time of punching. Otherwise, the normal outlet 15 and the temporary outlet 16 are opened in the same manner as in the first embodiment.

  As described above, according to the tap hole opening device 30 of the second embodiment, the normal tap hole 15 can be opened in the normal tap hole region 5, and the normal tap port region 5. A temporary outlet 16 can be opened in the temporary outlet area 7 between the outlet and the tuyere 6 immediately above it, and in the sense that it is between the normal outlet 15 and the tuyere 6 It is also possible to effectively open the temporary outlet 17 directly above the normal outlet 15 in the same normal outlet area 5 without any trouble. In other words, it is possible to engage with the opening of the normal shed 15 and the temporary openings 16 and 17. The guide cell 34 that guides and supports the drifter 31 is supported by the second actuator 44 and the first actuator 40 with respect to the support frame 36, and the height of the support shaft 39 is adjusted according to the expansion and contraction of the second actuator 44. At the same time, by rotating the support shaft 39 as a fulcrum according to the expansion and contraction of the first actuator 40, the perforation can be performed so as to correspond to the respective openings of the normal spout port 15 and the temporary spout ports 16 and 17. This is because the positioning and the drilling angle can be adjusted.

  As a result, when carrying out recovery work when the blast furnace cools down, the normal outlet 15 and the temporary outlets 16 and 17 are opened by one permanent outlet opening device 30. Therefore, as compared with the case of using a further temporary sprue opening device as in the prior art, the opening operation is much easier and the time required is shorter. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  After the normal tap 15 and the temporary taps 16 and 17 are opened, the tuyere 61, the normal tap 15 and the temporary taps 16 and 17 are made in the same manner as shown in FIG. Then, iron pipes 18, 19, 20, 21 and a plasma torch are inserted to melt the molten iron solidified in the furnace.

  As the second actuator 44, as described in the first embodiment, from the same viewpoint as the first actuator 40, it is preferable to adopt a hydraulic, electric or pneumatic type that is driven by remote operation. More desirably, a hydraulic type or an electric type may be employed.

  Subsequently, a spout closing device that is a third embodiment of the present invention will be described.

  FIG. 4 and FIG. 5 are side views of the tap hole closing device according to the third embodiment, and FIG. 4 shows a situation in which the normal tap opening opened in the normal tap port area is closed. FIG. 5 shows a situation in which a temporary dock that is opened directly above the normal dock in the normal dock area is closed.

  As shown in FIGS. 4 and 5, the spout closing device 50 according to the third embodiment suspends the mud gun 51 and the mud gun 51 from a horizontal posture to a posture in which the front portion is inclined downward. A support frame 53 that is pivotally supported in the state is provided, and an actuator 54 that supports the support frame 53 and advances and retracts in the horizontal direction. The actuator 54 is preferably a hydraulic one. However, it may be an electric type or a pneumatic type.

  The mud gun 51 accommodates a blocking material inside the cylinder, and pushes the blocking material from the nozzle 52 at the front end of the cylinder as the piston moves inside the cylinder. The driving is generally performed by hydraulic pressure.

  Here, the mud gun 51 is pivotally supported by a lower portion of the support frame 53 at a substantially central portion in the longitudinal direction, and can be rotated with the support shaft 55 as a fulcrum.

  Further, one end of a third actuator 56 that can be extended and contracted is rotatably connected to the rear end of the mud gun 51, and the other end of the third actuator 56 is connected to the rear end of the support frame 53. Is pivotally connected to the motor. Thus, the support shaft 55 and the third actuator 56 are arranged in order from the forward direction side to the reverse direction side along the forward and backward direction of the mud gun 51, and the posture of the mud gun 51 is determined through the support shaft 55 and the third actuator 56. While being supported.

  The actuator 54 that supports the support frame 53 is coupled to a turning beam (not shown) from a column (not shown) that is erected on the casting floor 8. This support | pillar and a turning beam differ from the thing of the tap hole opening apparatus 30 of above-described 1st, 2nd embodiment. The swivel beam is swung with respect to the support column so that the mud gun 51 and the support frame 53 are integrated with the actuator 54 and are moved away from the front of the normal spout area 5 (in FIG. 4 and FIG. And a standby position and a closed position in front of the normal spout area 5.

  The spout closing device 50 having such a configuration is not only for closing the normal spout 15 opened in the normal spout opening area 5 but also in the normal spout opening area 5. It is also used when the temporary spout 17 opened directly above 15 is closed.

  When closing the normal spout 15 that is opened in the normal spout opening area 5, as shown in FIG. 4, the mud gun 51 and the support frame 53 are first integrated with the actuator 54 first. You are placed in the standby position in front of.

  Next, the third actuator 56 is driven to contract, and in response to this, the mud gun 51 rotates so that the rear end portion can be pulled up with the support shaft 55 as a fulcrum. As a result, the mud gun 51 is in a posture in which the front part is inclined downward from the horizontal. The inclination angle of this posture substantially coincides with the drilling angle of the normal spout opening 15 inclined downward from the horizontal.

  When the actuator 54 moves forward in the horizontal direction from here, the mud gun 51 and the support frame 53 move forward, and the mud gun 51 reaches the closed position in a posture in which the front part is inclined downward from the horizontal. In this state, the advance output of the actuator 54 acts and the nozzle 52 of the mud gun 51 is pressed so as to be in close contact with the normal spout 15.

  Then, the piston of the mud gun 51 is driven. As a result, the closing material is pushed out from the nozzle 52 and is press-fitted into the normal outlet 15, and as a result, the normal outlet 15 is completely filled with the closing material and closed.

  On the other hand, when closing the temporary spout 17 opened directly above the normal spout 15 in the normal spout opening area 5, as shown in FIG. In the same manner, the mud gun 51 and the support frame 53 integrated with the actuator 54 are first placed at the standby position in front of the normal spout area 5.

  Next, the third actuator 56 is driven to extend, and accordingly, the mud gun 51 rotates so that the rear end portion can be pushed down with the support shaft 55 as a fulcrum. As a result, the mud gun 51 is in a substantially horizontal posture. The inclination angle of this posture substantially coincides with the drilling angle of the horizontal temporary spout 17.

  From here, in the same manner as when the normal spout 15 is closed, when the actuator 54 moves forward in the horizontal direction, the mud gun 51 and the support frame 53 move forward, and the mud gun 51 reaches the closed position in a horizontal posture. . In this state, the advance output of the actuator 54 acts and the nozzle 52 of the mud gun 51 is pressed so as to be in close contact with the temporary outlet 17.

  Then, the piston of the mud gun 51 is driven in the same manner as when the normal spout 15 is closed. As a result, the closing material is pushed out from the nozzle 52 and is press-fitted into the temporary outlet 17 so that the temporary outlet 17 is completely filled with the closing material and closed.

  Thus, according to the tap hole closing device 50 of the third embodiment, the normal tap port 15 opened in the normal tap hole region 5 can be closed, and the normal tap port region 5, the temporary tap 17 that is opened directly above the normal tap 15 can be closed. That is, it is possible to deal with the blocking of the normal dock 15 and the temporary dock 17. This is because the mud gun 51 is supported by the support shaft 53 by the support shaft 55 and the third actuator 56, and rotates around the support shaft 55 according to the expansion and contraction of the third actuator 56. 15. This is because the positioning of the tip of the nozzle of the mud gun 51 to the normal spout 15 and the temporary spout 17 can be adjusted so as to correspond to the blockage of the temporary spout 17.

  As a result, in carrying out the recovery work when the blast furnace has cooled down, the normal outlet 15 and the temporary outlet 17 can be closed by one permanent outlet closing device 50, Compared to the case of using a further temporary sprue port closing device as in the prior art, the closing operation is much easier and the time required for the closing operation can be shortened. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  After the normal dock 15 and the temporary dock 17 are closed, the operation shifts to normal blast furnace operation.

  The third actuator 56 is preferably a hydraulic, electric, or pneumatic actuator that is driven by a remote operation. This is because if the remote control can be performed, work near the apparatus is eliminated, which is particularly advantageous in terms of safety. However, since the frequency at which the blast furnace cools down, i.e., the frequency at which the temporary outlet 17 needs to be closed, cannot be predicted, the choice of using one for manual operation or one for remote operation is a matter of workability and cost. Judgment will be made as appropriate. In particular, from the viewpoint of controllability, it is desirable to employ a hydraulic or electric type.

  Next, a tap opening closing device according to a fourth embodiment of the present invention will be described with reference to FIG. The feature of the fourth embodiment is that the nozzle 52 of the mud gun 51 in the third embodiment is detachable so that the temporary dock 16 opened in the temporary dock area 7 can be effectively closed. In the point.

  FIG. 6 is a side view of the sprue port closing device according to the fourth embodiment, and particularly shows a situation where the temporary spout port 16 opened in the temporary spout port region 7 is closed.

  As shown in the figure, in the spout closing device 50 of the fourth embodiment, the nozzle 52 of the mud gun 51 in the third embodiment is made detachable, and the nozzle 52 is a deformed nozzle which is a separately prepared jig. Changed to 57. The deformed nozzle 57 has a shape that extends obliquely upward and is bent forward at the front end. That is, the height of the tip of the odd-shaped nozzle 57 is higher than the tip of the nozzle 52 in the third embodiment.

  The spout closing device 50 having such a configuration is used when closing the temporary spout 16 opened in the temporary spout opening region 7.

  As shown in FIG. 6, when closing the temporary outlet 16 opened in the temporary outlet area 7, the normal outlet 15 and the temporary outlet 17 in the third embodiment are closed. Similarly to the time, the mud gun 51 and the support frame 53 are first placed in the standby position in front of the temporary outlet area 7 integrally with the actuator 54.

  Next, the third actuator 56 is driven to contract, and in response to this, the mud gun 51 rotates so that the rear end portion can be pulled up with the support shaft 55 as a fulcrum. As a result, the mud gun 51 is in a posture in which the front part is inclined downward from the horizontal. In this posture, the height of the tip of the deformed nozzle 57 of the mud gun 51 coincides with the height of the external side of the temporary spout 16.

  From here, the mud gun 51 and the support frame 53 move forward by the actuator 54 moving forward in the horizontal direction, in the same manner as when the normal tap port 15 and the temporary tap port 17 in the third embodiment are closed. The mud gun 51 reaches the closed position. In this state, the advance output of the actuator 54 acts and the deformed nozzle 57 of the mud gun 51 is pressed so as to be in close contact with the temporary outlet 16.

  Then, the piston of the mud gun 51 is driven in the same manner as when the normal tap hole 15 and the temporary tap port 17 in the third embodiment are closed. As a result, the blocking material is pushed out from the deformed nozzle 57 and is press-fitted into the temporary outlet 16, and as a result, the temporary outlet 16 is completely filled with the closing material and closed.

  On the other hand, when the temporary outlet 16 is closed to the normal outlet 15 or the temporary outlet area 7, the modified nozzle 57 is replaced with the original nozzle 52, and the normal nozzle 57 is replaced in the same manner as in the third embodiment. The spout port 15 and the temporary spout port 17 are closed.

  Thus, according to the tap hole closing device 50 of the fourth embodiment, the normal tap hole 15 opened in the normal tap hole region 5 can be closed, and the normal tap port region 5 can close the temporary outlet 17 that is opened directly above the normal outlet 15, and in the sense that it is between the normal outlet 15 and the tuyere 6, It is also possible to effectively close the temporary tap 16 opened in the region 7 without any trouble. In other words, it is possible to deal with the blockage of the normal taphole 15 and the temporary tapout ports 16 and 17. This is because the mud gun 51 is supported by the support shaft 53 by the support shaft 55 and the third actuator 56, and rotates around the support shaft 55 according to the expansion and contraction of the third actuator 56. By appropriately selecting the modified nozzle 57 and attaching it to the mud gun 51, the normal spout 15 at the tip of the nozzle of the mud gun 51, the temporary spout, so as to meet the respective blockages of the normal spout 15 and the temporary spout 16, 17. This is because the positioning to the spouts 16 and 17 can be adjusted.

  As a result, when performing recovery work when the blast furnace cools down, the normal outlet 15 and the temporary outlets 16 and 17 can be closed by a single permanent outlet closing device 50. Therefore, the closing operation is much simpler and the required time can be shortened compared to the case of using a further temporary spout closing device as in the prior art. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  After the normal tap 15 and the temporary taps 16 and 17 are closed, the operation shifts to normal blast furnace operation.

  In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

  According to the tap hole opening device of the present invention, it is possible to open a plurality of tap holes having different heights by simply installing one unit, so that it can be opened for recovery work when the blast furnace has cooled down. The hole work is much easier, and the time required for the hole work is shorter. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  In addition, according to the tap outlet closing device of the present invention, it is possible to close a plurality of tap holes with different heights by simply installing one, so that recovery when the blast furnace cools down can be achieved. The closing work for the work is much simpler, and the time required for the closing work can be shortened. Therefore, the recovery work from the blast furnace cooling can be performed efficiently.

  Therefore, the present invention is particularly useful for recovery work when the blast furnace is cooled. Of course, it can also be applied to opening and closing during normal brewing, and is a very useful technique for blast furnace operation.

It is a side view which shows the condition which opens a normal tap hole in the area for normal tap holes about the tap hole opening apparatus which is 1st Embodiment of this invention. It is a side view which shows the condition which opens a temporary tap opening in the area for temporary tap openings about the tap opening apparatus which is 1st Embodiment. It is a side view which shows the condition which opens a temporary tap opening just above a normal tap opening in the area for a normal tap opening about the tap opening apparatus which is 2nd Embodiment of this invention. It is a side view which shows the condition which obstruct | occludes the normal tap opening opened to the area for normal tap openings about the tap opening closing apparatus which is 3rd Embodiment of this invention. It is a side view which shows the condition which closes the temporary tap opening opened in the normal tap opening area | region about the tap tap opening apparatus which is 3rd Embodiment directly above the normal tap opening. It is a side view which shows the condition which closes the temporary tap opening opened to the area for temporary tap openings about the tap opening closing apparatus which is 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the furnace lower part of a blast furnace which shows typically the condition which the molten iron solidified in the furnace is melted | dissolved by cooling of the blast furnace. It is a side view of the conventional tap hole opening apparatus. It is a side view of the conventional tap opening closing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Furnace body 5 Area for normal taps 6 Feathers 7 Area for temporary taps 15 Normal taps 16, 17 Temporary taps 18-21 Iron pipe 30 Taper opening device 31 Drifter 32 Rod 33 Bit 34 Guide Cell 35 Motor 36 Support Frame 37 Actuator 38 Lifting Rod 39 Supporting Shaft 40 First Actuator 41 Hacker Part 42 First Hacker Receiver 43 Second Hacker Receiver 44 Second Actuator 45 Third Hacker Receiver 50 Mud Port Closure Device 51 Mud Gun 52 nozzle 53 support frame 54 actuator 55 support shaft 56 third actuator 57 irregular nozzle 61 tuyere

Claims (5)

Located in the height direction with respect to at least one of the normal taphole area provided in the blast furnace body or the temporary taphole area provided immediately above the normal taphole area. It is a tap opening device that opens a plurality of tap ports of different types,
A drilling machine, a guide cell that guides and supports the drilling machine so as to advance and retract along the direction of drilling the drilling machine, and a support frame that supports the guide cell,
A spout opening device that is provided with a posture adjusting mechanism that adjusts the posture of the guide cell in the height direction at a support portion between the guide cell and the support frame.   The spout opening device according to claim 1, wherein the posture adjusting mechanism includes a hydraulic, electric, or pneumatic actuator that is driven by remote operation. The height of each other opened in at least one of the normal taphole area provided in the blast furnace body or the temporary taphole area provided immediately above the normal taphole area. A spout closing device that closes a plurality of spouts at different positions in a direction,
A mud gun and a support frame that supports the mud gun,
A spout closing device, wherein a posture adjusting mechanism for adjusting the posture of the mud gun in the height direction is provided at a support portion between the mud gun and the support frame.   4. The spout closing device according to claim 3, wherein the posture adjusting mechanism includes a hydraulic, electric or pneumatic actuator driven by a remote operation.   The spout closing device according to claim 3 or 4, wherein the nozzle of the mud gun can be replaced with a nozzle having a different tip height.

Images