JP4147045B2 - Automatic control method of hole opening machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  TECHNICAL FIELD The present invention relates to a hydraulic opening machine used for opening a hot water outlet for discharging a melt in a blast furnace, a refuse melting furnace, an ash melting furnace, etc. in an ironworks, and an automatic control method thereof.
[0002]
[Prior art]
  Conventionally, a hydraulic rock drill has been used as an opening machine for opening work such as a blast furnace. This hydraulic rock drill has a drill composed of a rod with a bid attached to the tip, and gives a striking force, rotational force, and feed force (force to move the rod in the axial direction) to the rod. The gate is being opened.
[0003]
  Usually, an operator performs an opening operation while appropriately combining the striking operation, the rotation operation, and the feed operation, and adjusting the strength, timing, and the like. In this case, since there is a variation depending on the operator, a considerable skill level is required to perform an optimum opening operation. Further, solidified molten metal may be scattered in the outlet. For this reason, when the tip of the bid comes into contact with the solidified molten metal, the hole does not advance, and if the hole is forcibly advanced in such a case, an accident that prevents the rod from being pulled out, that is, jamming occurs. In addition, if the drilling operation is forcibly advanced, drills and rods will be worn out early, and the shank rods of rock drills will wear out prematurely, causing problems that work efficiency will be significantly reduced and drilling costs will increase. To do.
[0004]
  On the other hand, as a hydraulic hole opening machine that performs hole opening work by appropriately combining the operations of hammering, rotation, and feed automatically in response to changes in work conditions, for example, Japanese Patent Laid-Open No. 08-333610. Those disclosed in Japanese Patent Laid-Open No. 2000-119715 and Japanese Patent Laid-Open No. 2000-119715 are known.
[0005]
  In particular, the above Japanese Patent Application Laid-Open No. 2000-119715 discloses the pressure of hydraulic oil that rotates a rod (rotational pressure), the pressure of hydraulic oil that causes a striking force to act on the rod (stroke pressure), and the hydraulic oil that causes the rod to advance and retreat in the axial direction. Control (feed pressure) is detected to prevent blow when the rotational pressure or feed pressure is less than the predetermined value. When the rotational pressure rises to the predetermined value, the feed is switched from forward to backward. Jamming prevention control that switches the feed from reverse to forward again when the pressure drops to a predetermined value, automatic feed force control that lowers the feed pressure accordingly when the rotational pressure rises, and feed speed is lowered accordingly when the rotational pressure rises Automatic feed speed control, when the rotational pressure increases, the impact pressure also increases and the feed pressure decreases Automatic control of striking force that also reduces the striking pressure, automatic control of the revolving speed that lowers the rotational speed to a predetermined value when the striking pressure increases, and the rotational speed to a predetermined value when the striking pressure decreases, the forward feed pressure reaches the set pressure It is disclosed that a striking start control for controlling so as not to perform striking when not performed, and a feed direction control for switching the feed to the reverse side when the forward feed pressure becomes equal to or higher than a set pressure.
[0006]
  According to the control method for the hydraulic hole opening machine disclosed in this gazette, idle driving prevention control, jamming prevention control, feed force automatic control, feed speed automatic control, impact force automatic control, rotation speed automatic control, impact start control Since at least one control of the feed direction control is automatically performed, the burden on the operator who performs the hole opening operation is reduced.
[0007]
[Problems to be solved by the invention]
  By the control method of the hydraulic opening machine of the latter conventional example (Japanese Patent Laid-Open No. 2000-119715), it is possible to improve the trouble during the drilling forward and the trouble during the backward movement and reduce the burden of the opening work. However, this publication does not discuss anything about the operation work at the time of opening when the tap is completely opened. In particular, it is preferable to quickly retract the drill after opening the hot water outlet, but this publication does not disclose the operation work after the opening.
[0008]
  That is, when the tap is opened, the bid at the tip of the drill enters the hot melt in the melting furnace. For this reason, when the drill is pushed in all the way, it takes a long time for the tip end of the rod and the bid to be immersed in the melt before it is pulled out, causing problems that they can deform and become unusable and cannot be removed. . Moreover, even if the bid and the rod come off, the service life is significantly reduced.
[0009]
  On the other hand, if the drill is moved backwards quickly, the hot water outlet at the hot water outlet is incomplete and smooth hot water cannot be discharged.
[0010]
  Therefore, it is strongly desired to retract the drill as soon as possible immediately after opening. As one of the methods, it is conceivable to move the drill forward after a certain distance and then retract it. That is, since the thickness of the furnace wall of the melting furnace is set to a predetermined thickness, when the drill is advanced by the set thickness, the drill can be moved backward as if the hot water outlet has been opened. Conceivable. However, a solidified product is formed on the inner wall of the melting furnace, and the amount of the solidified product is constantly changing depending on the state of the melting furnace. It is possible to open the tap for the first time through this solidified material, but since the thickness of this solidified material is not constant, if the drill is moved backward after a predetermined distance, it may be opened. However, there are cases where no holes are formed, and stable openings cannot be obtained.
[0011]
  Further, as can be seen in Japanese Patent Application Laid-Open No. 2001-116240, it is known that a drilling speed is detected and a change in the drilling speed is detected to make a hole. Since the opening state is detected and controlled, the accuracy of detecting the opening is improved as compared with the case where the opening state is moved forward by a predetermined distance. Also, in this publication, the drill is retracted by detecting when the hole is opened, so that the bending of the drill is reduced and the life of the drill is prolonged as compared with the conventional manual retraction.
[0012]
  However, the method of this publication only detects the time when the hole is opened, and stopping the advancing of the drill and retracting it is an operation from a detection signal after detecting that the hole has been opened. For this reason, the position where the drill is stopped is a position where the drill is slightly pushed into the melting furnace, and it is difficult to extend the life of the drill tip.
[0013]
  Therefore, the present invention provides a method for accurately detecting the state of drilling in order to stop the advancement of the drill as soon as possible immediately after opening the hole and to retreat immediately in order to solve the above-mentioned problems. is there.
[0014]
  In particular, instead of detecting when a hole is drilled and performing drill retraction control, the timing immediately before drilling is detected and the complete drilling timing is predicted, and the drill is retreated according to this prediction. Is.
[0015]
[Means for Solving the Problems]
  According to a first aspect of the present invention, there is provided an automatic control method for a hydraulic hole opening machine in which a hot water outlet of a melting furnace is opened by feeding, striking, and rotating a drill of the hydraulic hole opening machine.From the reference positionThe advance distance Lb is detected, and it is detected that the drill is in the vicinity immediately before opening the outlet of the melting furnace.OpeningA change in the feed flow rate Rf of the hydraulic opening device is detected, and the immediately before opening of the pouring gate is detected based on the magnitude of the change, and the opening of the pouring gate is detected. From the time of detecting the previous timePredetermined distance LaJudging that the tap has opened after the drill has advanced,After the predetermined distance La has advanced, a control method for a hydraulic hole punching machine that interrupts and reverses the advancement of the drill,The predetermined distance La is directly detected from the feed amount of the drill, and the predetermined distance La can be changed according to the molten state of the melt in the melting furnace. In this control method, the state of the hole can be detected with high accuracy, and the drill can be quickly retracted immediately after the hole is opened, so that the life of the drill can be improved. In particular, even if a solidified product is generated on the inner wall of the melting furnace, it is possible to reliably detect the immediately before opening without being affected by the thickness of the solidified product, and to predict the state of opening accurately. Furthermore, since the feed amount can be changed according to the melting state of the melting furnace, it is possible to accurately predict the state of opening through the solidified material.
[0016]
  According to a second aspect of the present invention, there is provided an automatic control method for a hole opening machine according to the first aspect, wherein the drill is retracted until the drill tip comes out from the tap for every predetermined length Lc of the drilling length. When the drill feed pressure Pf exceeds the predetermined pressure Pf1 and the advance distance L of the drill decreases to the predetermined value L1 or less, the drill is controlled.Within the prescribed rangeInching drilling control that drills forward and backward, and once the rotational pressure Pr rises to the predetermined pressure Pr2 in the drilling hole, the feed is temporarily stopped, and if the rotational pressure Pr still rises to the predetermined pressure Pr3, the forward travels backward. When the rotation pressure Pr is reduced to the predetermined pressure Pr4, the jamming prevention control is switched to advance again, and when the drill rotation pressure Pr exceeds the predetermined pressure Pr5 and the feed pressure Pf exceeds the predetermined pressure Pf2, When the rotational pressure Pr is equal to or higher than the predetermined pressure Pr6 and the feed backward pressure Pf is equal to or higher than the predetermined pressure Pf3 during the hole bending correction drill control for moving the turning drill back and forth, and retreating after the drilling, the feed is performed for the predetermined time t1. At least one of the inching reverse impact control that moves forward, then reverses for a predetermined time t2 by weak reverse impact, and further reverses for a predetermined time t3 by strong reverse impact One or more of a control method for controlling. In this method, each operation such as striking, rotating, feeding, etc. of the hole opening machine can be appropriately and automatically controlled in response to changes in the work situation, so that the burden on the operator can be reduced, the hole opening time can be shortened, Wear of drilling tools such as bids and rods can be reduced. In particular, using a long-term hydraulic opening machine, it is possible to stably perform appropriate control corresponding to changes in work conditions even when the regular opening cycle impact, rotation, and feed pressure values change. it can.
[0017]
  According to a third aspect of the present invention, there is provided a hydraulic hole opening machine that opens the outlet of a melting furnace by a combination of rotation, hammering, and feed. A detection sensor for detecting each of L is provided, and based on the detection result of the detection sensor, the advance distance Lb of the drill of the hydraulic hole opening machine is detected, and the hydraulic hole opening machine opens the outlet of the melting furnace. A first detecting means for detecting that the position is immediately before opening, and a change in the feed flow rate Rf of the hydraulic opening machine after detection by the first detecting means; A second detecting means for detecting that it is immediately before, a third detecting means for detecting when the drill has advanced a predetermined distance La after detection by the second detecting means, and a predetermined distance for the drill by the third detecting means. When La moves forward After detecting a configuration and a feed control means to retract to interrupt the advancement of the drill. In this configuration, since the drill can be retracted immediately after opening the tap, the drill can be prevented from being damaged, the drill can be reliably retracted and the drill life can be improved. At the same time, drilling and / or retraction can be performed with precise control, so that drilling can be performed efficiently and reliably.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
  1 and 2 show an example of the hot water supply device 20. The pouring device 20 is provided with a hydraulic hole opening machine 21 for opening the hot water outlet 11 and a mud gun 22 for closing the hot water outlet 11 and further moving the hole opening machine 21 and the mud gun 22 in a predetermined direction. A control device 24 that automatically controls the support mechanism 23 and the hole opening machine 21, the mud gun 22, and the moving support mechanism 23 is provided.
[0020]
  When discharging the molten material (molten metal) M accumulated in the furnace bottom of the melting furnace main body 3, the hole opening machine 21 excavates and removes the mud material 25 filled in the outlet 11 to remove the outlet 11.OpeningTo do. The hole opening machine 21 is fixed to the lower surface side of the slide frame 35 of the movement support mechanism 23, the guide cell 27 parallel to the hot water outlet 11, the drifter head 28 supported slidably on the lower surface side of the guide cell 27, A rod 30 that can be moved back and forth in the direction of the melting furnace main body 3 at a position below the guide cell 27 and that is arranged in parallel to the hot water outlet 11, has a bid 29 at the tip and can face the hot water outlet 11, and a drifter head 28. A drifter 31 that gives a striking force and a rotational force to the rod 30 and a guide cell 27 are provided. The drifter 31 is moved back and forth (moves forward and backward in the direction of the melting furnace body 3) to move the rod 30 back and forth (melting furnace body 3). And a drive device 32 that moves forward and backward in the direction of.
[0021]
  As the drifter 31, a known hydraulic rock drill with a reverse impact device, for example, the one disclosed in Japanese Patent No. 2913538 is used. Hydraulic pressure from a hydraulic pump (not shown) is supplied to the hydraulic aperture machine 21 to drive the drifter 31 and the drive device 32. The drive device 32 includes a sprocket 32a provided at both ends of the guide cell 27, a chain (not shown) wound around both the sprockets 32a and interlocked to the drifter head 28, and a feed motor 32b that circulates the chain. Thus, when the chain is rotated by the feed motor 32b, the drifter head 28 moves back and forth, and the rod 30 and the drifter 31 move forward and backward accordingly.
[0022]
  A pair of slide rails 33, 33 are disposed in the front-rear movement support mechanism 23 so as to be in a horizontal posture and orthogonal to the tap 11. A slide frame 35 is supported on the slide rails 33 and 33 via a plurality of guide rollers 34 so that the slide frame 35 can run freely. The slide frame 35 can move horizontally in a direction orthogonal to the hot water outlet 11. By moving the slide frame 35 along the slide rails 33, 33 by the slide cylinder 36, the opening machine 21 and the mud gun 22 are moved synchronously in the direction perpendicular to the tap 11 (up and down direction in FIG. 1). .
[0023]
  When the molten metal M in the melting furnace main body 3 is poured out, first, the opening machine 21 of the pouring unit 20 is operated, and the drill D composed of the rod 30 having the bid 29 at the tip is pushed into the pouring spout 11. By appropriately moving forward, striking / rotating, and retreating, the filled mud material 25 and the metal layer Ma fixed to the inner surface of the furnace wall 3a are excavated and the excavated material is discharged. That is, the above-mentioned forward, impact / rotation, and reverse operations are repeated a plurality of times, thereby penetrating the runner communicating with the storage space for the molten metal M in the melting furnace body 3. When the runner is penetrated, the drill D is retreated to the outside of the hot water outlet 11, and the molten metal M is discharged through the hot water outlet 11.
[0024]
  As shown in FIG. 5, the hole opening machine 21 includes an encoder S <b> 1 that detects the position of the feed, a pressure sensor S <b> 2 that detects the pressure of hydraulic oil supplied to the rotation device of the drifter 31, and a striking device for the drifter 31. A pressure sensor S3 for detecting the pressure of the hydraulic oil supplied to the pressure sensor, a pressure sensor S4 for detecting the pressure of the hydraulic oil supplied to the drive device 32, and a flow rate (feed flow rate) of the hydraulic oil supplied to the drive device 32. And a flow rate sensor S5 for detecting the flow rate, and each is connected to the control device 24. Further, a distance detection sensor S6 for detecting the advance distance L from the reference position by the drill D is also connected to the control device 24.
[0025]
  Further, based on the detection results of these detection sensors S 1 to S 6, the advance distance Lb of the drill D of the hydraulic hole opening machine 21 is detected, and the hydraulic hole opening machine 21 opens the outlet 11 of the melting furnace 3. First detection means A1 for detecting that the vicinity is just before opening, and after detection by the first detection means A1, a change in the feed flow rate Rf of the hydraulic opening machine 21 is detected, and the magnitude of the change Then, the second detection means A2 for detecting that it is immediately before opening and the third detection means A3 for detecting when the drill D has advanced a predetermined distance La after detection by the second detection means A2 are the control device. 24.
[0026]
  Further, the control device 24 detects the advance of the drill D by the third detection means A3,DrillFeed control means Fa for interrupting and advancing D is provided. In FIG. 5, P represents a striking device, R represents a rotating device, and F represents a feed device. Each device P, R, and F performs control described below by a control signal from the control device 24. .
[0027]
  In the present invention, the control when the tap hole 11 is completely opened and the drilling is completed will be described.
[0028]
  As shown in FIG. 3, before and after completely opening (penetrating) the tap 11, the impact pressure, the rotational pressure, the feed pressure, the impact flow rate (the flow rate of hydraulic oil supplied to the impact device of the drifter 31), Changes in rotational flow rate (flow rate of hydraulic oil supplied to the rotating device of the drifter 31) and feed flow rate were measured. as a result,Opening (through)After that, there is a change in each pressure and flow rate. AndOpening (through)Immediately before, the impact pressure, rotational pressure, feed pressure, impact flow rate, and rotational flow rate were hardly changed or slightly changed, but a clear change was observed in the feed flow rate.
[0029]
  this is,Opening (through)Immediately before, cracks are first generated in the metal layer Ma as shown in FIG. 4A (H1), and then cracks are expanded as shown in FIG. 4B. (H2) Mass of the metal layer Ma Moved,The flow rate of hydraulic oil supplied to the drive device 32, that is,The feed flow rate is likely to increase. And as shown in FIG.Opening (through)After that, the lump is completely separated from the metal layer Ma (H3) and is in an idle state.
[0030]
  That is,Opening (through)Immediately before, a part of the metal layer Ma cracked,The flow rate of hydraulic oil supplied to the drive device 32, that is,It is considered that the feed flow rate increases and becomes a flow rate different from the normal feed flow rate.
[0031]
  The present invention describes this phenomenon, namelyOpening (through)Taking advantage of the obvious change in the feed flow rate just before,Opening (through)The state is predicted.
[0032]
  First, the advance distance Lb of the drill D is measured,Near just before opening (penetrating)Detect whether or not. The advance distance Lb may be a distance such that, for example, the tip of the drill D is positioned on substantially the same plane as the inner surface of the furnace wall 3a of the melting furnace body 3. After the detection, the change in the feed flow rate is measured. When the feed flow rate Rf suddenly changes to Rf1, for example, when Rf1 = 1.5RfOpening (through)Judge as just before.
[0033]
  Further, not only Rf1 = 1.5Rf, but (f) may be arbitrarily set as Rf1 = (k) X (Rf). Alternatively, in consideration of the thickness of the metal layer M of the melting furnace, for example, (k) may be changed according to the temperature of the melting furnace.
[0034]
  Further, instead of detecting the case where Rf1 becomes a predetermined magnification, the case where the flow rate value is set may be detected. Even in that case, the set flow rate may be changed by the temperature of the melting furnace or the like. Furthermore, instead of directly determining the feed rate based on the value of the feed flow rate, the change rate of the feed flow rate is checked and the transition is inspected, and the magnitude of the change rate reaches a predetermined value, or May be detected indirectly from a change in feed flow rate indirectly, such as when the feed flow rate change rate exceeds a predetermined value for a predetermined time. It is also possible to detect by combining the value of the feed flow rate, the rate of change of the feed flow rate, the time, and the like. Further, the feed flow rate and the feed pressure, rotation pressure, impact pressure, etc. may be combined.
[0035]
  In this way, the outlet 11Opening (through)After detecting the last minute, if you move forward a predetermined distance La,Opening (through)Judge that Immediately after the predetermined distance La has advanced, the advance is stopped and immediately retreated. The predetermined distance La may be a distance corresponding to the case where the entire lump of the metal layer Ma is completely separated from the main body of the metal layer Ma as shown in FIG. As a result, compared to detecting and controlling the penetration,Opening (through)Immediately after detection, the time during which the drill D is immersed in the molten metal M of the melting furnace body 3 can be reduced, and the life of the drill D can be greatly increased. At the same time, since the deformation of the drill D and the rod 30 can be greatly reduced, troubles during the next drilling can be reduced, and a smooth drilling can be realized.
[0036]
  In addition,Predetermined distance LaComplete the hole at the point of advance, ieOpening (through)However, the predetermined distance La is a slight distance, and it is preferable to determine by directly measuring the moving distance of the drill D. Depending on the type of the melting furnace and the like, the completion of drilling may be determined by the time during which the movement of the drill D continues, the moving speed of the drill D, and the like.
[0037]
  Next, control of forward movement, striking / rotation, backward movement, etc. during drilling will be described.
[0038]
  First, the furnace wall detection control will be described. At the start of drilling, since the drill D has not arrived at the furnace wall 3a, the drifter 31 moves forward with no blow, no rotation or weak rotation pressure, and a low feed pressure. When the drill D hits the furnace wall 3a, the feed speed becomes zero. If the feed speed is 0 or less than the set value for a certain time or longer, it is determined that it has arrived at the furnace wall 3a, and a normal drilling cycle is started from here. That is, the counterbore is automatically performed with a low rotational force, a medium striking force, and a low feed pressure.
[0039]
  Next, jamming prevention control in the drill holes will be described. The jamming prevention control prevents the bid 29 from forcibly biting out and coming off (jamming) or causing the hole to be bent due to encountering a hardened part or a mud missing part of the mud material 25 during the drilling operation. It is control to do.
[0040]
  When the deceleration increases in the drilling hole and the rotational pressure Pr rises to the predetermined pressure Pr2, the feed is temporarily stopped, and when the rotational pressure Pr drops to the predetermined pressure Pr4 lower than Pr2, the control is performed to switch forward again. Even if the feed is temporarily stopped, when the rotational pressure Pr rises and reaches Pr3 higher than Pr2, the feed is switched from forward to backward, and when the rotational pressure Pr decreases to a predetermined pressure Pr4, the control is switched to forward again. When re-advancing, the vehicle runs idle until it reaches the reverse start position. During this time, the feed advance pressure and the flow rate of the feed advance oil are reduced to prevent re-entry at high speed. Further, in order to prevent idling, the striking pressure is set to 0 or a low striking force, and wear of the striking tool such as the drill D is prevented.
[0041]
  By this operation, the rod 30 is retracted before it is pushed into the rod 30 so that the rod 30 cannot be pulled out, so that jamming can be prevented and a hole can be smoothly opened. Moreover, since the drill D is temporarily separated from the high-temperature mud material 25 by the retreat of the rod 30, the cooling effect of the bid 29 is also improved.
[0042]
  Usually, the flour produced by cooling the heated metal M is a lump-like lump having a certain size and mass. Although this lump is blown so as to be discharged from the tap 11, a part of the lump stagnates in the tap 11. If this state continues, the drill D or the like bites during retraction after opening and cannot be retreated.
[0043]
  The hole cleaning control means that every time a predetermined length Lc is drilled, the hole drilling machine 21 is retracted until the tip of the drill D comes out of the outlet 11 and blows and is stagnated by the scraping operation of the drill D. This is a control for cleaning the so-called hot water outlet 11, which discharges the floured powder to the outside of the hot water outlet 11.
[0044]
  As described above, in the tap 11, the powdered powder in which the metal M is solidified is scattered. When the bid 29 comes into contact with the flour in the drilling hole, the drilling load is increased and the drilling ability is reduced. If the hole is forcibly continued, the flour may be caught and become unable to come off. Therefore, when the feed pressure Pf of the drill D becomes equal to or higher than the predetermined pressure Pf1 and the advance distance L of the drill D decreases below the predetermined value L1 in the drill hole, the tip of the drill D extends from the outlet 11 In small increments without slipping out(Within a predetermined range)Inching drilling control is performed to drill forward and backward. During this inching drilling control, the flour is blown and discharged.
[0045]
  In addition, for example, when the drill hole region moves from the mud layer 25 to the metal layer Ma, it is estimated that the drill D escapes upward due to the shape into which the metal M has flowed. At this time, when the escape amount is large, the rotational pressure becomes excessive, and jamming prevention control is activated, or biting occurs and the hole becomes impossible. However, when the escape amount is small, the hole is bent as it is and the hole is bent. Similarly, when moving from a hard mud layer to a relatively soft mud layer, depending on the state of the soft mud layer (the upper part is soft), the phenomenon that the drill D escapes toward the soft mud layer occurs, and biting occurs at the time of opening. It is the cause.
[0046]
  Therefore, when the rotation pressure Pr of the drill D is higher than the predetermined pressure Pr5 lower than Pr2 and the feed pressure Pf is higher than the predetermined pressure Pf2, the drill bending correction drilling control for moving the drill D forward and backward several times is performed. Do.
[0047]
  When the drill D is retracted after drilling, depending on the open state of the pouring spout 11, the flouring is not stagnant or the pouring spout 11 is not necessarily opened linearly. You may not be able to retreat or you may not be able to retreat. In order to prevent this, if the rotational pressure Pr is equal to or higher than the predetermined pressure Pr6 lower than Pr2 and the feed reverse pressure Pf is equal to or higher than the predetermined pressure Pf3 higher than Pf2 during the retreat after drilling, the predetermined time t1 is reached. The inching reverse impact control is repeated, in which the feed is advanced forward, and then the cycle is repeated for a predetermined time t2 with a weak reverse impact and further with the strong reverse impact for a predetermined time t3.
[0048]
【The invention's effect】
  In the present invention, in the automatic control method of the opening machine for opening the pouring gate of the melting furnace, immediately before the pouring of the pouring gate is detected, and after the drill advances by a predetermined distance La from this detection time, the hole is opened. Judgment and retreat the drill, so the tap isOpening (through)As a result, the drill can be quickly retracted immediately after opening the hole, and the life of the drill can be improved.
[0049]
  In particular,Opening ( Penetration ) Just beforeSince a change in the feed flow rate Rf of a nearby hydraulic hole opening machine is detected, and it is determined that the change amount is just before opening of the tap hole,Opening (through)Prediction accuracy just before is high, even if solidified material is generated on the inner wall of the melting furnace, it is possible to reliably detect just before opening without being affected by the thickness of this solidified material, and accurately predict the open state it can.
[Brief description of the drawings]
FIG. 1 shows an external view of a hot water apparatus according to an embodiment of the present invention.
FIG. 2 shows a hole opening machine provided in the hot water supply apparatus of FIG.
FIG. 3 shows various measurement data before and after opening.
FIGS. 4A and 4B are diagrams for explaining an opening state of a tap just before penetration, where FIG. 4A shows a state in which a crack has occurred in a metal layer, FIG. 4B shows a state in which the crack has expanded, and FIG. Indicates a state in which the tap is opened.
FIG. 5 is a block diagram illustrating a control system according to an embodiment of the present invention.
[Explanation of symbols]
M Molten metal
Ma metal layer
D drill
3 Melting furnace body
3a Furnace wall
11 Outlet
20 Hot spring equipment
21 Hydraulic opening machine
22 Mad Gun
23 Movement support mechanism
24 Control device
25 Mud material
27 Guide cell
28 Drifter head
29 Bid
30 rods
31 Drifter
32 Drive unit
32a sprocket
32b Feed motor
33 Slide rail
34 Guide roller
35 slide frame
36 Slide cylinder
L Advance distance
La Advance distance just before opening
Lb Advance distance to just before opening
L1 Advance distance when inching drilling
Ps impact pressure
Pr Rotation pressure
Pf Feed pressure
Rf Feed flow rate

Claims (3)

In the automatic control method of the hydraulic hole opening machine that opens the outlet of the melting furnace by feeding, striking and rotating the drill of the hydraulic hole opening machine,
Detecting the advance distance Lb from the reference position of the drill of the hydraulic opening machine, and detecting that the drill is in the vicinity immediately before opening the outlet of the melting furnace;
After detecting that the drill is in the vicinity immediately before opening the tap, the change in the feed flow rate Rf of the hydraulic punch is detected, and immediately before the tap is detected based on the magnitude of the change. And
It is determined that the hot water outlet has opened after a predetermined distance La drill has advanced from the point in time immediately before the opening of the hot water outlet is detected, and after the predetermined distance La has advanced, the hydraulic opening is interrupted and retracted. A control method for a drilling machine,
The predetermined distance La is directly detected from the feed amount of the drill, and the predetermined distance La can be changed according to the molten state of the melt in the melting furnace. Control method. In the automatic control method of the hydraulic opening machine according to claim 1,
Hole cleaning control for cleaning the opening portion by retracting the drill until the drill tip comes out of the tap hole for every predetermined length Lc of the drill length;
Inching that drills the drill by moving the drill back and forth within a predetermined range when the feed pressure Pf of the drill exceeds a predetermined pressure Pf1 and the advance distance L of the drill decreases to a predetermined value L1 or less. Drilling control,
When the rotational pressure Pr rises to the predetermined pressure Pr2 in the drilling hole, the feed is temporarily stopped. Even when the rotational pressure Pr rises to the predetermined pressure Pr3, the feed is switched from forward to backward. When the rotational pressure Pr decreases to the predetermined pressure Pr4, the feed is advanced again. Jamming prevention control to switch to,
In the drilling hole, when the rotational pressure Pr of the drill is equal to or higher than the predetermined pressure Pr5 and the feed pressure Pf is equal to or higher than the predetermined pressure Pf2, the hole bending correction drilling control for moving the drill back and forth several times,
If the rotational pressure Pr is equal to or higher than the predetermined pressure Pr6 and the feed reverse pressure Pf is equal to or higher than the predetermined pressure Pf3 during the retreat after drilling, the feed is advanced by a predetermined time t1, and then the reverse reverse strike is performed for the predetermined time t2. An automatic control method for a hydraulic hole opening machine, wherein at least one or more of the inching reverse impact control for reversing the predetermined time t3 by a strong reverse impact is performed. In the hydraulic opening machine that opens the outlet of the melting furnace by a combination of rotation, hammering and feed,
A detection sensor for detecting the rotational pressure Pr, the striking pressure Ps, the feed pressure Pf, the feed flow rate Rf, and the feed distance L is provided, and based on the detection result of the detection sensor,
A first detecting means for detecting a forward distance Lb of the drill of the hydraulic hole opening machine and detecting that the hydraulic hole opening machine is in the vicinity immediately before opening the outlet of the melting furnace;
A second detection means for detecting a change in the feed flow rate Rf of the hydraulic opening machine after the detection by the first detection means, and detecting that the change is just before the opening by the magnitude of the change;
Third detection means for detecting when the drill has advanced a predetermined distance La after detection by the second detection means;
A hydraulic opening machine comprising: a feed control means for detecting a time when the drill advances by a predetermined distance La by the third detection means, and for stopping the advance of the drill and moving it backward.

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