JP4767774B2 - Blast furnace outlet closing device and blast furnace outlet closing method - Google Patents

Description

  The present invention relates to a blast furnace outlet closing device and a blast furnace outlet closing method using a mud gun for closing the outlet during blast furnace operation.

  The bottom of the blast furnace is provided with a spout for discharging hot metal, but the spout is constructed of a refractory so as to withstand the passage of high-temperature hot metal. In front of the tap opening, an opening machine for opening the tap opening and a mud gun for closing the tap opening are arranged. The opening and closing of the taphole are normally performed alternately as follows.

  First, in order to discharge the hot metal accumulated in the bottom of the blast furnace, the hot metal outlet is opened, and the hot metal discharge (steaming) is started. After the hot metal is discharged for several hours, the mud is filled with mud and closed with a mud gun, and the discharge of the hot metal from the spout is stopped.

  As disclosed in Patent Document 1, the mud gun is in a standby position during tapping, and at the time of closing, the mud gun turns and moves from the standby position toward the tapping outlet. It reaches the position of the spout while being exposed to the hot metal flowing out.

  Then, the mud gun that has reached the position of the tap opening presses the tube tip against the tap opening, waits for the mud to be filled, and fills the tap opening with the required amount of mud.

  Since the mud used for closing the taphole is an unfired refractory material having plasticity, it is necessary to hold the mud for a predetermined time after the filling is completed until the mud firing is completed. When a predetermined mud firing time elapses, the mud gun is turned and moved from the spout opening position to the standby position. When the mud gun reaches the standby position, the turning / movement is stopped, and the mud gun is put on standby until the next time the outlet is closed.

  When filling the outlet with the mud and closing the outlet, the surface of the outlet and the surface of the tip of the mud gun must be brought into contact with no gap. If there are gaps in the contact portions of these surfaces, the hot metal leaks out from the gaps, making it difficult to close the spout with a mud.

  In addition, due to the fouling of the spout that occurs in connection with the closing operation and the impact that occurs when the tip of the mud gun collides with the spout, the refractory may peel off after the spout is closed.

  On the other hand, the tube tip of the mud gun is damaged or melted because it is exposed to the molten iron spouted during the closing operation.

  If the spout is damaged or melted, the surface of the mud gun that contacts the tube tip can be cut or polished to a certain flatness to prepare for the next blockage. On the other hand, if the tube tip of the mud gun is damaged or melted, the tube tip cannot be used for the next blockage, so that the damaged or melted tube tip must be replaced in preparation for the next blockage.

  Therefore, several techniques for suppressing or preventing damage or melting of the tip of the mud gun have been proposed so far.

  In Patent Document 2, not only a turning cylinder but also a tilting cylinder is attached to the barrel of the mud gun, the mud gun is swung at the top of the output until it reaches just before the exit, and the mud gun A mud gun that is not exposed to or touched the hot metal until the tube tip reaches just before the spout, tilts the mud gun just before the spout, and presses the barrel against the spout A so-called two-motion type mud gun is disclosed.

  In Patent Document 3, a shield plate that can be opened and closed is attached to the tip of the gun gun barrel, and the shield plate is closed at the standby position when the mud gun is turned, and the shield plate is opened in front of the spout. A mud gun with an apparatus is disclosed.

  Further, Patent Literature 4 discloses that the melting damage limit of the tip of the mud gun is calculated based on the heat transfer mechanism, and the optimum turning speed of the mud gun is set.

  However, the 2-motion type mud gun disclosed in Patent Document 2 has a problem that the frequency of operation suspension increases.

  In other words, the 2-motion type mud gun has a structure that can mechanically swivel and move to a predetermined spout position, and can cope with retraction of the spout into the furnace body after being tilted. However, if the follow-up distance to the receding port is short and the receding distance of the spout reaches a predetermined distance, the operation must be stopped and the swivel / tilting trajectory of the mud gun must be adjusted. Therefore, if the predetermined distance is short, the frequency of operation suspension increases.

  On the other hand, the 1-motion type mud gun that pushes the tube tip against the tap hole only by turning, even if the tap port retracts to a certain distance inside the furnace body, it only needs to increase the turning amount according to the reverse distance Because it is possible, the distance to follow the exit door is long. Therefore, the two-motion type mud gun has a problem that it can be used only for a short period of time compared to the one-motion type mud gun, because the refractory is built once.

  Further, in the mud gun disclosed in Patent Document 3, a reliable shielding plate must be attached to the tip of the gun barrel, and an opening / closing device that opens and closes the shielding plate at an appropriate timing is required. There is a problem that the number of objects increases and a complicated control mechanism is required.

  The method of setting the optimum turning speed disclosed in Patent Document 4 is to reduce the portion of the tip of the cylinder that directly touches the hot metal even though the time at which the tip of the mud gun is exposed to the hot metal can be shortened by increasing the turning speed. Since it cannot be done, it has a problem that it is not sufficient in terms of preventing damage to the tube tip.

JP-A-6-172831 JP-A-6-184613 JP 2001-240907 A JP 2005-194578 A

  In view of the above situation, the present invention can repeatedly perform the closing operation of the tap opening with a simple mechanism, and prevent the tip of the mud gun from being melted or damaged, thereby quickly and reliably An object of the present invention is to provide a blast furnace outlet closing device and a blast furnace outlet closing method that can be closed.

  As a result of intensive studies on a method for solving the above-mentioned problems, the present inventor has found a method for quickly closing the spout by pressing the mud as a method for preventing melting or damage of the tip of the mud gun.

  “Mud quick pressing” means pushing the mud from the tip of the mud gun before it reaches the spout while the mud gun moves toward the spout.

  A mud is usually clogged up to the tip of the tube tip of the mud gun or from the tip of the tube tip to the inside of the barrel. Since the tip of the mud gun is exposed to the hot metal jet from just before the tap opening until filling starts at the tap opening position, the damage is most advanced. In particular, it frequently occurs that the inside of the tube tip that receives the hot metal jet flow is greatly damaged and the tube tip is melted from the inside.

  As a result of the investigation, when the mud is quickly pushed from the tip of the mud gun, the mud pushed out of the tip of the mud gun is exposed to the jet of hot metal, while preventing the jet, Since it protects, it discovered that a pipe tip and its inner side were not damaged or melted down.

  This invention was made | formed based on the said knowledge, and the summary is as follows.

(1) Blast furnace outlet closure that repeats a series of operations to close the outlet intermittently with control means that controls the extrusion and filling of the mud by turning and moving the tip of the mud gun toward the outlet. In the device
When the control means moves the tip of the mud gun toward the tap port, a predetermined amount of mud is once removed from the tip of the mud gun tube at a predetermined distance before the position of the tap port at the time of the previous tap port closing. Blast furnace outlet closing device characterized by performing extrusion control.

(2) The control means is based on position detection means for detecting the position of the tube tip of the mud gun, pressure detection means for detecting the pressing pressure of the tube tip of the mud gun, and detection values of the position detection means and the pressure detection means. The blast furnace outlet closing device according to (1), further comprising a control arithmetic device for calculating the position of the tip of the mud gun.

(3) The control calculation device predicts the position of the spout opening at the time of the last spout closing based on a predetermined experience value from the position of the spout at the time of the last spout closing. The blast furnace outlet closing device according to (2), wherein mud extrusion / filling is controlled.

(4) The control arithmetic device determines and stores the position of the spout opening based on the detected value of the position of the tip of the tube of the mud gun and the detected value of the pressing pressure of the tip of the tube of the mud gun. Or the blast furnace outlet closure apparatus as described in (3).

(5) The mud gun is configured to push the mud inside the barrel for mud storage inside the barrel, the first hydraulic cylinder for pivoting and moving the gun barrel, and the mud barrel, which is pivotably attached to the fixed base. A second hydraulic cylinder for filling, and
The blast furnace exit according to any one of (1) to (4), wherein the position detection means is a rotational position detector, and the pressure detection means is a hydraulic pressure detector of a first hydraulic cylinder. Mouth closure device.

(6) A series of operations for closing the tap port using a blast furnace tap port closing device equipped with a control means for controlling the extrusion and filling of the mud by turning and moving the tip of the mud gun toward the tap port. In the blast furnace outlet closing method that repeats intermittently,
When the tip of the mud gun is moved toward the tap port according to the command of the above control means, a predetermined amount of the tip of the mud gun is once before a predetermined distance from the position of the tap port at the time of the previous tap port closing. Blast furnace outlet closing method characterized by extruding mud.

(7) The control means is based on position detection means for detecting the position of the tube tip of the mud gun, pressure detection means for detecting the pressing pressure of the tube tip of the mud gun, and detection values of the position detection means and the pressure detection means. The blast furnace outlet closing method according to (6), further comprising a control arithmetic unit that calculates the position of the tip of the mud gun.

(8) The control arithmetic device predicts the position of the spout opening at the time of the last spout opening from the position of the spout opening at the time of the previous spout closing, based on a predetermined experience value, Blast furnace outlet closing method according to (7), wherein mud extrusion / filling is controlled.

(9) The control arithmetic device determines and stores the position of the spout opening based on the detected value of the position of the tip of the tube of the mud gun and the detected value of the pressing pressure of the tip of the tube of the mud gun. Or the blast furnace outlet closing method as described in (8).

(10) The mud gun pushes and fills the barrel with a gun barrel pivotably attached to a fixed base, a first hydraulic cylinder for pivoting the gun barrel, and a mud in a barrel for mud storage in the gun barrel to an outlet. A second hydraulic cylinder, and
The blast furnace exit according to any one of (6) to (9), wherein the position detection means is a rotational position detector, and the pressure detection means is a hydraulic pressure detector of a first hydraulic cylinder. The mouth closure method.

  According to the present invention, it is not necessary to perform special work or use special equipment to detect the position of the spout opening, and the position of the spout is stably detected as a part of the closing work. Even if the spout is retracted inside the furnace body, it can follow the retreat while maintaining the effect of pressing the mud quickly, so the spout is closed quickly and reliably. be able to.

  As a result, it is possible to prevent damage or melting of the tube tip of the mud gun and the inside thereof, and it is possible to reduce the operation rate of the mud gun and the maintenance cost of the tube tip.

  Further, according to the present invention, it is not necessary to provide the mud gun with a special control device / device, and it is possible to realize an early effect of mud by controlling the turning / movement of the mud gun with the control arithmetic device. .

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below by taking the 1-motion type mud gun shown in FIGS. 1, 2, and 3 as an example. In addition, in each figure, the same part is shown with the same code | symbol.

  FIG. 1 shows a mud gun M and a control system for driving the mud gun M. The hydraulic circuit for driving the mud gun M includes a hydraulic pump 26, a proportional control flow rate adjusting valve 15 for adjusting the amount of oil supplied to the turning hydraulic cylinder 5 (first hydraulic cylinder), and a filling hydraulic cylinder 7 (second hydraulic pressure). It comprises a proportional control flow rate adjusting valve 16 for adjusting the oil supply amount to the cylinder).

  The hydraulic circuit is provided with a turning pressure detector 13 for detecting the turning / moving state of the mud gun M and a filling flow rate detector 14 for detecting the filling amount of the mud in the mud gun M. The control means 27 for controlling these comprises a drive control device 28 and a control arithmetic device 17.

  FIGS. 2 and 3 show a cross section of the blast furnace 10 and the tap hole 11 and a mode of the 1 motion type mud gun M. FIG. In the mud gun M, a support arm 3 having a turning hydraulic cylinder 5 is attached to a turning post 2 provided on the fixed base 1, and a barrel 6 for storing mud at the tip of the supporting arm 3 and a hydraulic cylinder for filling the mud. A gun barrel 4 containing 7 is attached and configured.

  The operating rate and operating cost of the mud gun M depend on how many times the tube gun 8 at the tip of the gun barrel 4 has withstood the blockage until it is replaced due to damage or melting. A rotational position detector 9 for detecting the number of turns is attached.

  As shown in FIG. 1, in order to turn the mud gun M, first, a turning command is given to the proportional control flow rate adjusting valve 15 for turning. The proportional control flow rate adjusting valve 15 for turning controls the oil supply amount to the turning hydraulic cylinder 5, but the position of the tube tip 8 of the mud gun M cannot be determined only by the oil supply amount. Therefore, a position detector that detects the position of the tube tip 8 of the mud gun M is required.

  Because of the structure of the mud gun, a detector that directly detects the position of the cylinder tip cannot be installed in the mud gun. Therefore, for detecting the position of the cylinder tip, a rotational position detector 9 attached to the swivel post 2 on the fixed side of the mud gun is used. Used (see FIGS. 2 and 3).

  As the rotational position detector 9, for example, an absolute encoder or a pulse generator can be used, but other types may be used.

  The rotational position detector 9 continuously inputs rotational position signals to the control arithmetic device 17. The control arithmetic unit 17 calculates the moving distance of the barrel tip 8 of the mud gun M and the swivel speed of the mud gun based on the input rotational position signal and the pre-set mud gun shape information and arrangement information, The signal is output to the drive control device 28 as a signal.

  Upon receiving the output signal, the drive control device 28 gives a turning command to the proportional control flow rate adjusting valve 15 to control the rotation of the mud gun M. Since it is not possible to directly observe the state in which the tube tip 8 is pressed against the spout 11, the swing pressure detector 13 monitors the change in the hydraulic pressure in the swing hydraulic cylinder 5 to the spout 11 of the tube tip 8. The pressing state of is determined.

  The turning pressure detected by the turning pressure detector 13 is input to the control arithmetic device 17. The control arithmetic device 17 outputs a signal to the drive control device 28 based on the inputted turning pressure. Upon receiving this signal, the drive control device 28 gives a filling command to the proportional control flow rate adjusting valve 16 to adjust the amount of mud pushed out from the tube tip 8 of the mud gun M to the spout 11.

  Next, an appropriate method for mud filling with a mud gun will be described.

  FIG. 6 shows a comparison between the closure of the spout opening when the mud 22 is “fast pressed” (FIG. 6B) and the closure of the spout opening when the mud 22 is not pressed quickly (FIG. 6A). Show. When the cylinder tip 8 is not “rapidly pressed” (FIG. 6A), the mud 22 clogged in the barrel tip 8 is scraped off as the barrel tip 8 approaches the outlet, and the mud 22 clogged in the barrel tip 8 is scraped off. From the inner surface, the tube tip 8 is greatly melted (25 in the figure is a melted portion).

  On the other hand, in the case of “fast pressing” (FIG. 6B), the filling hydraulic cylinder 7 is driven at the position of the distance α from the spout 11 and the mud 22 in the mud storage barrel is moved. Push out from the tube tip 8 (see arrow 23 in the figure).

  The mud 22 pushed out from the tube tip 8 receives the hot metal jet 24 at the tip, and stops the hot metal so that the hot metal does not scatter or penetrate from the tube tip 8 to the barrel side while being shaved by the jet. As a result, damage or melting of the tube tip 8 and the inside thereof can be prevented.

  In order to ensure that this mechanism for preventing damage and melting of the tube tip functions reliably and to obtain a sufficient effect (the effect of quickly pressing the mud), the position of the tube tip 8 when starting the rapid pressing of the mud is important.

  Here, FIG. 7 shows the relationship between the average tube tip life (the number of times that can be closed) indicating the durability of the mud gun and the quick-press start distance (α) from the tap hole as a result of actual measurement.

  If the early pressing of the mud is too late (α is short), the mud inside the cylinder tip will be beaten by the hot metal jet before the rapid pressing starts, and the inside of the cylinder tip will be melted. Moreover, even if the early pressing start is too early (α is long), the mud pushed out from the tube tip is quickly scraped by the hot metal jet, and the effect of rapid mud pressing cannot be obtained.

  As described above, it can be seen from FIG. 7 that there is an appropriate rapid pressing start distance in order to obtain the rapid pressing effect of mud. In other words, in order to sufficiently obtain the effect of quickly pressing the mud, it is necessary to accurately grasp the position of the tube tip so that the rapid pressing of the mud can be started at (distance α from the spout opening) ± β. This is a finding found by the present inventor and the premise of the present invention.

  FIG. 8 shows the relationship between the average tube tip life (number of times that can be closed) and the amount of mud when quickly pressed, as a result of actual measurement. Assuming that it is scraped off by the hot metal jet, increasing the amount of fast-pressing mud improves the average tube tip life (the number of times that can be closed), but there is a limit to the improvement.

  In other words, since the mud itself does not have strength, if the amount of quickly pressed mud exceeds the required critical amount, it will fall off due to its own weight, and the effect of preventing the molten iron jet from being melted by the rapidly pushing mud and preventing the tip from being damaged. (Mad's fast-press effect) cannot be obtained.

There is an appropriate amount of mud in the fast-pressing mud amount from the viewpoint of sufficiently obtaining the effect of rapid mud pressing, but there is no need to strictly limit it. and the area of pig iron mouth, taking into account the outflow speed, etc. of hot metal, not good be appropriately determined.

  Here, based on FIG.3 and FIG.10, the control determination logic which controls appropriately the position of a mud gun and a cylinder tip in the control arithmetic unit 17 is demonstrated.

  First, it will be described that the initial position of the spout 11 is detected in advance and set in the control arithmetic unit 17 prior to the work of closing the spout with an actual mud.

  After building the refractory material of the taphole 11 (see “18” in FIG. 6), the position of the taphole 11 is significantly different from that before construction. Therefore, it is necessary for the control arithmetic device 17 to store the position of the spout 11 after building the refractory 18 as an initial position in order to appropriately control the position of the tube tip 8.

  The gun barrel 4 of the mud gun M is placed in the standby position in advance.

  A turning command is given to the proportional control flow rate adjusting valve 15 for turning so that the mud gun M moves in the direction of the outlet 11 from the control arithmetic device 17 via the drive control device 28. Then, oil is supplied to the turning hydraulic cylinder 5 of the mud gun M at a constant flow rate by the turning proportional control flow rate adjusting valve 15.

  The link mechanism is activated by the extension of the turning hydraulic cylinder 5, and the mud gun M turns in the direction of the spout 11. At this time, the rotational position detector 9 continuously detects the position of the mud gun and outputs a detection value to the control arithmetic unit 17.

  When the tube tip 8 of the mud gun M reaches the spout 11, the calculated value of the turning speed calculated from the output of the rotational position detector 9 becomes zero. At the same time, the pressure output from the turning pressure detector 13 increases.

When the tube tip 8 of the mud gun M reaches the tap hole 11, the position of the pipe tip 8 calculated from the output of the rotational position detector 9 of the mud gun M is set as the position ε ₀ of the tap port 11, and the control arithmetic unit 17. Remember me.

  The determination that the barrel 8 of the mud gun M has reached the spout 11 is carried out as follows.

  The determination is made using the output of the turning pressure measurement value by the turning pressure detector 13, the output of the turning position detector 9, and the turning speed calculated by the control arithmetic unit 17 from the output of the turning position detector 9.

  These three values (turning pressure, turning position, and turning speed) show temporal changes as shown in FIG. 9 while the mud gun M turns from the standby position to the position of the spout 11.

  As can be seen from FIG. 9, the output of the swiveling pressure detector 13 rises and then rises again until the tube tip 8 reaches the abutment port 11 and comes into contact therewith. Therefore, when it is determined from the output of the turning pressure detector 13 that the tube tip 8 of the mud gun M has reached the spout 11, it is not erroneously determined that the tube tip 8 has reached the spout 11 during turning. There must be.

After reaching the spout 11 side from the turning position a set in the control arithmetic unit 17 in advance, and when the output of the swiveling pressure detector 13 is equal to or higher than the threshold value P ₀ , the mud gun M is placed at the spout 11. It is determined that the tube tip 8 has arrived.

  Further, even when the pressure detection signal indicates 0 due to the disconnection of the wiring of the swivel pressure detector 13 or the like, even when an abnormal state occurs, the closing operation of the spout must be continued. When the calculated value of the turning speed calculated from the output of 9 is 0, it is determined that the barrel tip 8 of the mud gun M has reached the spout 11.

After the initial position ε ₀ of the spout 11 is stored in the control arithmetic unit 17, a command is given to the proportional control flow rate adjustment valve 15, the mud gun M is turned from the position of the spout 11 to the standby position, and the spout Preparing for hole opening work. When the normal opening work and the closing work are repeated, the position of the spout 11 is learned and the initial position ε ₀ of the spout 11 is updated each time.

In addition, the initial position ε ₀ of the spout 11 is updated when the memory of the mud gun control device 17 is cleared, when the refractory 18 of the spout 11 is rebuilt, and the spout 11 is polished and cut. This is performed when the position of the spout 11 is greatly different from the position of the spout 11 stored in the control arithmetic unit 17 such as time.

  Next, a method of learning control of the position of the spout 11 that is generated by repeatedly opening, swaging, and closing will be described.

Also during the normal closing operation, the position of the spout 11 is determined based on FIG. 10 as with the storage of the initial position ε ₀ .

Consider a case where the n-th occlusion is performed after grasping the initial position ε ₀ . Also at this time, the position of the spout 11 can be obtained by the same method as when the initial position ε ₀ is grasped. The control arithmetic unit 17 again stores the position of the spout 11 as the position ε _n of the spout 11 obtained by the n-th closing.

As shown in FIG. 4, the position ε _n of the spout 11 changes every time the mud gun M reaches the spout 11. Thus, every time it reaches the spout 11 constantly. Since the position ε _{n of the} spout opening 11 is updated, the control arithmetic unit 17 can perform the rapid pressing control of the mud following it even if the position of the spout opening changes.

However, when trying to close the nth time, the position of the spout is not the spout position ε _n−1 stored in the mud gun at that time. This is because the refractory material at the spout opening is peeled off after storing the spout opening position ε _n-1 at the time of the last n−1 blockage.

As shown in FIG. 7, the effect of quickly pressing the mud changes depending on the positional relationship between the spout and the tube tip where the mud is quickly pressed. Therefore, in order to obtain the maximum effect of pressing the mud to the maximum extent, before pressing the nth time, the pressing operation is started to the position ε _{n−1 of the} outlet opening stored in the control arithmetic unit 17. The position to be corrected must be corrected.

  FIG. 5 shows the time-dependent change in the position of the tap hole actually measured. From this change over time, the present inventor has found that the amount Δd (hereinafter referred to as “retraction amount”) of the refractory at the tap hole peels off. )) Found that the refractory at the door of the building was almost constant.

  Unless polishing or cutting is performed, the amount of retreat due to one blockade of the refractory at the spout is Δd. Therefore, the position of the spout that the mud gun control arithmetic unit 17 recognizes before the clogging is determined. Then, it is corrected with Δd so as to match the actual position of the tap hole. The control arithmetic unit 17 calculates Δd by the following calculation.

Δd ₀ = 0
Δd _n = {Σ (ε _n −ε _n-1 )} / n
[epsilon] _n : Position of the tap hole at the n-th block _n : Number of blockages from the construction of the refractory or polishing / cutting of the tap hole From the above, the mud fast-press control is shown in the flowchart on the right side of FIG.

When the mud is pressed quickly at the n-th closing time, the control arithmetic unit calculates the position of the tip of the mud gun from the rotational position signal output from the rotational position detector 9, and the position of the tip of the mud gun is corrected. When the distance from the spout position ε _n-1 + Δd _{n-1 is equal} to the distance α set in advance in the control arithmetic device, control is performed to push out a predetermined amount of mud.

  Finally, the conditions of the apparatus for obtaining the mud fast pressing effect will be described.

  As shown in FIG. 7, the position where the mud is quickly pressed, that is, the proportional control flow rate adjustment for filling, as can be understood from the relationship between the average cylinder tip life (number of times that can be closed) and the quick pressing start distance from the tap opening. The life of the tube tip changes depending on the position at which the push command is issued to the valve 16.

  Therefore, in order to maximize the life of the tube tip, the pusher must be issued to the proportional control flow rate adjustment valve 16 for filling by recognizing the distance α from the spout opening that gives the longest life of the tube tip. I must.

  The position of the tap opening that is the starting point of α can be obtained with high accuracy by the aforementioned control.

  The control arithmetic unit 17 is required to issue a push command to the charging proportional control flow rate adjustment valve 16 at a distance α considered to be the most effective. The control arithmetic unit 17 receives an input every determined control cycle γ.

  Therefore, the control arithmetic unit 17 receives the output from the rotational position detector 9 every control cycle γ, and determines the position of the tip 8 of the mud gun. The moving speed of the tube tip 8 of the mud gun is not constant as shown in FIG. Therefore, assuming that the variation likelihood of the distance α allowed for the effect expected to quickly push the mud is β, to grasp the current position within β during the turn, the following control cycle is used. The control arithmetic unit 17 must be operable.

γ <β / V
γ: control cycle of the control arithmetic unit, β: rapid pressing position variation likelihood V: moving speed of the cylinder tip near the outlet of the mud gun Naturally, the output of the rotational position detector 9 must be such that β cannot be grasped. Therefore, the maximum resolution κ of the rotational position detector 9 must satisfy the following condition.

κ> 2πn / θ
here,
θ: The amount of change in the output of the rotational position detector during the movement of the β tube tip when the tube tip is near the distance α from the front of the spout, and n: The number of rotations of the rotational position detector per rotation of the mud gun swivel post κ : Maximum resolution of rotation detector For example, taking a 1-motion type mud gun used in recent large blast furnaces as an example, the rapid push position variation likelihood β = 5 mm, the moving speed V of the tube tip near the taphole V = 200 mm / Since it is about sec, the method of the present invention can be realized by selecting the control arithmetic device 17 that operates in the control cycle γ = 25 msec or less of the control arithmetic device 17.

  Similarly, in the rotational position detector 9 attached to the swivel post 2, when a change of 1 degree is a change of 90 mm in the vicinity of the tap, the rotation with a resolution of 6500 digits or more is required at least once. It is necessary to select the position detector 9.

  The embodiment of the blast furnace outlet closing device of the present invention has been described in detail above by taking a 1 motion type mud gun as an example. When using other types of mud guns, add a mud gun, a tip detection means, and a pressing pressure detection means, and control the movement of the mud gun to the outlet using the same control arithmetic unit. The mud filling can be controlled in the same way as a 1 motion type mud gun. And by this control, the spout can be quickly closed while preventing the tip from being melted.

  Further, when the mud gun tube tip is swung to the tap port using the blast furnace tap port closing device described above, it is once before a predetermined distance set in advance from the position of the tap port at the time of the previous closing operation. A blast furnace outlet closing method in which the outlet is closed after filling a predetermined amount of mud from the tip of the mud gun at the position is also an aspect of the present invention.

  As described above, according to the present invention, even if the spout is retracted into the furnace body, the mud can be followed quickly while maintaining the effect of quickly pushing the spout. As a result, it is possible to reliably block the tube, and as a result, it is possible to prevent the damage or melting of the tube tip of the mud gun and the inside thereof, and to reduce the operation rate of the mud gun and the maintenance cost of the tube tip.

  Further, it is not necessary to provide the mud gun with a special control device / device, and the mud quick-start effect can be realized by controlling the driving of the mud gun with the control arithmetic unit. Therefore, the present invention is a technique that can be utilized as a blast furnace control technique.

It is a figure which shows the control system in embodiment of this invention. It is a figure which shows the aspect of 1 motion mud gun in a standby position. It is a figure which shows the aspect of 1 motion mud gun when moving the tip of a mud gun to the spout. It is a figure which shows the condition where the position of a spear opening retreats for every obstruction | occlusion. It is a figure which shows quantitatively an example of the change of the spout opening position for every obstruction | occlusion. It is a figure which shows the difference of the extent of melt | disconnection of the cylinder tip in the obstruction | occlusion which does not push a mud quickly, and the obstruction | occlusion which carries out a rapid mud push. It is a figure which shows the change of the average cylinder tip life by the rapid pushing start distance (alpha) from a tap opening. It is a figure which shows the change of the average pipe tip life by the amount of rapid pressing muds. Based on the output of the turning pressure detector (turning pressure), the output of the rotational position detector (turning angle), and the output of the rotational position detector when the mud gun turns and moves from the standby position to the outlet position. It is a figure which shows the time change of the turning speed which the control arithmetic unit calculated. It is a figure which shows the procedure of a spout opening position memory | storage and the rapid pressing of the mud in a control arithmetic unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed base 2 Turning post 3 Support arm 4 Gun barrel 5 Turning hydraulic cylinder (1st hydraulic cylinder)
6 Mud storage barrel 7 Filling hydraulic cylinder (second hydraulic cylinder)
8 Tube tip (cap)
DESCRIPTION OF SYMBOLS 9 Rotation position detector 10 Blast furnace 11 Outlet 12 Hot metal 13 Turning pressure detector 14 Filling flow detector 15 Proportional control flow rate adjustment valve for turning 16 Proportional control flow rate adjusting valve for filling 17 Control arithmetic unit 18 Fire resistance of the outlet Item 19 Position of the spout opening immediately after construction 20 Retraction amount of the spout opening at the N-th closing time 21 Position of the spout opening at the N-th closing time 22 Mud 23 Mud discharging operation of the filling hydraulic cylinder 24 Hot metal jet 25 Tube tip 26 Hydraulic pump 27 Control means 28 Drive controller M Mud gun

Claims (10)

In the blast furnace outlet closing device, which has a control means for controlling the extrusion and filling of the mud by turning and moving the tip of the mud gun toward the outlet, and repeatedly repeating a series of operations for closing the outlet.
When the control means moves the tip of the mud gun toward the tap port, a predetermined amount of mud is once removed from the tip of the mud gun tube at a predetermined distance before the position of the tap port at the time of the previous tap port closing. Blast furnace outlet closing device characterized by performing extrusion control. The control means is based on position detection means for detecting the position of the tip of the barrel of the mud gun, pressure detection means for detecting the pressing pressure of the tip of the barrel of the mud gun, and the detection value of the position detection means and the pressure detection means. The blast furnace outlet closing device according to claim 1, further comprising a control arithmetic device that calculates the position of the cylinder tip. The control arithmetic unit predicts the position of the spout at the time of the current spout closing from the position of the spout at the time of the last spout closing, based on a predetermined experience value, and pushes out the mud. The blast furnace outlet closing device according to claim 2, wherein filling is controlled. The said control arithmetic unit determines and memorize | stores the position of a spout opening | mouth based on the detected value of the position of the tip of a cylinder tip of a mud gun, and the detected value of the pressing pressure of the tip of a barrel of a mud gun Blast furnace outlet closing device. The mud gun pushes and fills a barrel that is pivotably attached to a fixed base, a first hydraulic cylinder that pivots and moves the barrel, and a mud in a barrel for mud storage in the barrel to an outlet. 2 hydraulic cylinders, and
The blast furnace output according to any one of claims 1 to 4, wherein the position detection means is a rotational position detector, and the pressure detection means is a hydraulic pressure detector of a first hydraulic cylinder. Mouth closure device. Using a blast furnace outlet closing device equipped with a control means to control the extrusion and filling of the mud by turning and moving the tube tip of the mud gun toward the outlet, a series of operations for intermittently closing the outlet are intermittently performed. In the repeated blast furnace outlet closing method,
When the tip of the mud gun is moved toward the tap port according to the command of the above control means, a predetermined amount of the tip of the mud gun is once before a predetermined distance from the position of the tap port at the time of the previous tap port closing. Blast furnace outlet closing method characterized by extruding mud. The control means is based on position detection means for detecting the position of the tip of the barrel of the mud gun, pressure detection means for detecting the pressing pressure of the tip of the barrel of the mud gun, and the detection value of the position detection means and the pressure detection means. The blast furnace outlet closing method according to claim 6, further comprising a control calculation device that calculates the position of the cylinder tip. The control arithmetic unit predicts the position of the spout at the time of the current spout closing from the position of the spout at the time of the last spout closing, based on a predetermined experience value, and pushes out the mud. -The blast furnace outlet closing method according to claim 7, wherein filling is controlled. 9. The control arithmetic device determines and stores the position of the spout opening based on a detected value of the position of the tip of the mud gun tube and a detected value of the pressing pressure of the tube tip of the mud gun. Blast furnace outlet closure method. A gun barrel in which the mud gun is pivotally attached to a fixed base, a first hydraulic cylinder for pivoting the gun barrel, and a second hydraulic pressure for extruding and filling the mud in the mud storage barrel in the gun barrel to the outlet. A cylinder, and
The blast furnace output according to any one of claims 6 to 9, wherein the position detection means is a rotational position detector, and the pressure detection means is a hydraulic pressure detector of a first hydraulic cylinder. Mouth closure method.

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