JP4751082B2 - Control method for tap opening hydraulic opening machine - Google Patents

Description

  The present invention relates to a control method for a tap opening hydraulic opening machine that improves the hole detection accuracy in the tap opening operation.

  Hydraulic rock drills are used to open the melt outlets such as blast furnace outlets. This hydraulic rock drill has a drill consisting of a rod with a bit attached to the tip, and provides the striking force, rotational force, and feed force to move the rod in the axial direction to open the tap. It is carried out.

  Usually, an operator performs an opening operation while appropriately combining rod striking operation, rotation operation, and feed operation, and adjusting the strength and timing thereof. However, since the solidification state and thickness of the sealing encapsulant (mud material) at the time of the previous opening are different, it is difficult to open the hole in the same manner as the previous time, and depending on the skill level of the operator The time and open state will also vary.

  In order to solve the problem of opening work that relies exclusively on such workers, the opening work is automatically performed by appropriately combining the operations of hammering, rotation, and feed in response to changes in the opening work situation. A method is disclosed in Patent Document 1. This method requires less skill for the operator and automatically selects the preferred conditions in response to changes in the work situation to prevent idling control, jamming prevention control, automatic feed speed control, and automatic rotation speed control. Further, it is possible to perform a hole opening operation combined with feed direction control, and the burden on the operator is reduced.

  Further, Patent Literature 2 discloses a hole detection method as a means for supplementing the automatic hole opening operation. In this method, a hole is detected based on a change in feed speed during penetration, and the rod is automatically retracted.

Similarly, in Patent Document 3, with regard to the hole detection method, the rod life is improved, the state immediately before opening of the tap is predicted based on the change in the feed flow rate, and the rod is advanced by a predetermined distance from this detection time point. It is disclosed that the rod is determined to have been opened and then the rod is automatically retracted.
JP 2000-119715 A JP 2001-116240 A JP 2003-294375 A

  With respect to the hole detection method, in the method of Patent Document 2 in which the hole is detected only by the amount of change in the feed speed, the flexible part in the mud is not contacted with the object to be opened (solidified material on the inner surface of the furnace wall). There is a risk of misjudgment when penetrating.

  Further, in the method of Patent Document 3, the amount of change in the feed flow rate in the state immediately before opening may vary depending on the solidified state and thickness of the mud material, and therefore the state immediately before opening cannot be accurately predicted. Further, the required forward distance varies depending on the solidified state and thickness of the mud material. Furthermore, from the foregoing, the final confirmation of completion of the opening is left to the operator's judgment, and the rod tip is surely inserted into the melting furnace in order to prevent the hole from being clogged in the middle of the hot water. Since it is necessary to perform cleaning, the prediction method is not suitable for the actual situation.

  For this reason, there is a problem that the worker has to work in a severe environment such as high atmospheric temperature and dust.

  Therefore, the present invention provides a control method for a tap hole hydraulic opening machine that can reliably detect the opening of the tap port of a blast furnace.

The present invention relates to a control method of a hydraulic opening machine that opens a spout opening by a combination of hammering, rotation and feed of a rod , wherein the feed advance speed of the rod is increased to a predetermined speed, the feed of the rod The forward flow rate has increased to a predetermined flow rate, the feed pressure of the rod has dropped to a predetermined pressure, the opening depth of the rod has exceeded a predetermined distance, and the drifter rotational pressure of the rod has a predetermined pressure By detecting whether the rod drifter rotational speed has exceeded a predetermined rotational speed, or the rod drifter chain tension has decreased to a predetermined tension, or a combination thereof. the rod after detecting the inrush starting to hot metal rod for a predetermined time further feed forward, taphole then pulling out the rod Once it reaches the thermal energy of the hot metal to al outflow to a predetermined level, the opening of the taphole to and determines that completed successfully.

  FIG. 3 is a graph showing the relationship between feed pressure and feed speed and time in the control method according to the present invention.

  As shown in FIG. 3, when the rod advances to the iron skin contact, the feed pressure is constant within the specified range, and then the feed pressure rises by hitting the mud at the actual opening start timing. To reach the jamming control area, and the rod repeats forward and reverse.

  In the jamming control area, the feed speed, feed flow rate, feed pressure, hole opening depth, drifter rotation pressure, drifter rotation speed, or drifter chain tension vary greatly before and after penetration (the rod enters the hot metal after penetration and the penetration resistance is reduced). Since the feed speed is increased, the feed flow rate is increased, the feed pressure is decreased, the opening depth reaches a predetermined distance, the drifter rotation pressure is decreased, the drifter rotation speed is increased, and the drifter chain tension is decreased) When the penetration determination value (threshold value) set in advance is exceeded, it is determined that the penetration has been completed.

  Even after it is determined that the opening has been completed, the feed is advanced for a predetermined time while also cleaning the hole so that the hole is not closed because the hole is incomplete. After the set timer elapses, the process moves to rod withdrawal.

  After pulling out the rod, hot metal comes out from the hole. Since this hot metal radiates thermal energy at a high temperature, the thermal energy is measured with a luminance meter, thermometer, etc. Recognize that it is normal, and automatically retract the opening machine including the swivel to prepare for splashing from the hot water.

  However, if the thermal energy is less than or equal to the threshold value, the above steps are repeated until the hole detection determination is recognized as normal, and the hole opening operation is performed.

  In the present invention, since the final determination of the opening of the spout opening is performed by measuring the thermal energy of the hot metal, the detection of the opening is reliable.

  In addition, by performing cleaning of the tap hole that reliably inserts the rod tip into the melting furnace, blockage of the hole in the middle of the hot water can be prevented.

  Further, since the hole opening operation is automated, the worker's witness operation in a harsh environment such as a high ambient temperature and dust can be eliminated, thereby saving labor.

  FIG. 1 is a view showing an example of a sprue opening hydraulic opening machine to which the control method of the present invention is applied. The hole opening machine 1 includes a conical rod 2 and is driven on the blast furnace outlet 6 by driving the hole opening machine 1 back and forth by a feed motor 5 provided on the guide cell 3 and driven by the hydraulic pressure from the hydraulic unit 4. Open a hole. A pulse generator 7 is connected to the rotation shaft of the feed motor 5 and includes an arithmetic unit 8 that integrates the output of the pulse generator 7 based on the output start signal. The amount of movement of the hole opening machine 1 by the pulse generator 7 is the number of pulses. And the feed pressure during the opening operation is measured by the pressure detector 8a. A thermal energy detector 9 such as a luminance meter or a thermometer for measuring the thermal energy of the hot metal is disposed in the vicinity of the outlet.

  The hole opening machine 1 is provided with a feed force for moving the rod 2 in the axial direction by the feed motor 5, and further with a rotational force and a striking force, and performs a hole opening operation by combining feed, rotation or striking.

  FIG. 2 is a flowchart of the control method of the present invention.

(1) When rod feed starts, the pressure gauge detection signal, pulse generator detection signal, and thermal energy detection signal thermal energy detection signal are respectively input to the arithmetic circuit to calculate feed pressure, feed speed, and thermal energy. Is started and feed forward is started (step S1).

(2) When the feed advances and the rod hits the mud material, the feed pressure increases as shown in FIG. 3, and the arithmetic unit determines whether or not the feed pressure P is equal to or higher than the set value P3 (P ≧ P3). (Step S2).

  In this step S2, since the penetration resistance increases and the feed pressure increases as the rod tip feeds forward, if P> P3, the process proceeds to the next step S3. If the feed pressure P does not exceed the set value P3, the feed advances by returning to the feed advance in step S1.

(3) While the feed is moving forward, the arithmetic unit determines whether or not the feed pressure P is less than the upper limit set value P1 (P <P1) for preventing jamming (step S3). The upper limit set value P1 is a feed pressure at which the rod may buckle. The upper limit set value P1 for feeding is larger than set values P2 and P3 described later.

  If the feed pressure P is less than the upper limit set value P1 in step S3 (P <P1), the feed load that may cause buckling has not been reached, and the rod advances as it is.

(4) If the feed pressure P is greater than or equal to the upper limit set value P1 (P ≧ P1) in step S3, the rod is retracted because it is greater than the feed load that may cause buckling (step S4).

(5) It is determined whether or not the feed pressure P is equal to or less than a set value P2 (P ≦ P2), which is a feed pressure at which there is no risk of buckling of the rod, by the retreat of step S4 (step S5).

  If the tip of the rod is retracted so as to be separated from the mud material at the unopened portion in step S4, the feed pressure is lowered. Therefore, it is confirmed in this step S5 that the feed pressure is lowered. If the feed pressure P becomes equal to or less than the set value P2 (P ≦ P2) in step S5, there is no risk of buckling of the rod, so the process returns to step S1 and feeds forward in response to a feed advance signal. If the feed pressure P exceeds the set value P2 in step S5 (P> P2), the feed is moved backward until a decrease in the feed pressure is confirmed.

  By this step S4 and step S5, the rod can be prevented from buckling by performing the jamming control of the forward / backward movement of the rod.

(6) Furthermore, it is determined whether the feed speed V is equal to or higher than the set speed V1 immediately after the penetration (V ≧ V1) from the characteristic that the feed speed increases when the tip of the rod penetrates (step S6). The penetration of the rod is confirmed by V ≧ V1 in step S6. Also, instead of increasing the feed speed, the feed flow rate is increased, the feed pressure is decreased, the opening depth is reached to a predetermined distance, the drifter rotational pressure is decreased, the drifter rotational speed is increased, or the drifter chain tension is decreased, or Any of these may be combined to confirm the start of entry of the rod into the hot metal.

  If the feed speed V is less than the set speed V1 (V <V1), the process returns to step S1 to continue the feed forward until V ≧ V1.

(7) When the penetration is confirmed in step S6, the feed advance time T is equal to or greater than the predetermined time T1 (T ≧ T1) in order to clean the hole by feeding the rod further into the furnace for a predetermined time. Then, further advancement of the rod is determined (step S7). The forward movement of the rod continues until it moves forward for a predetermined time.

(8) When the rod moves forward for a predetermined time and T ≧ T1, the feed is moved backward and the rod is pulled out from the outlet (step S8).

(9) When the rod is pulled out from the spout and the hot metal comes out, the hot metal radiates thermal energy at a high temperature. Therefore, this thermal energy E is measured with a luminance meter, a thermometer, etc. Is greater than or equal to the threshold value E1 (E> E1) (step S9).

  If it is equal to or greater than the threshold value, it has been discharged normally, so it is recognized that the hole detection determination is normal, and the hole opening machine is automatically retracted to prepare for splashing from the hot water.

  If it is not equal to or greater than the threshold value, it is recognized that the opening is not normal, the process returns to the feed forward in step S1, and the subsequent steps are repeated, and the opening operation is performed again until E> E1.

It is a figure which shows an example of the tap hole hydraulic opening machine to which the control method of this invention is applied. It is a flowchart of the control method of this invention. It is a graph which shows the relationship between feed pressure and feed speed, and time in the control method by this invention.

Explanation of symbols

1: Tap opening hydraulic opening machine 2: Rod 3: Guide cell 4: Hydraulic unit 5: Actuator (feed motor)
6: Blast furnace outlet 7: Pulse generator 8: Arithmetic unit 8a: Pressure detector 9: Thermal energy detector

Claims (3)

In a control method of a hydraulic hole opening machine that opens a tap hole by a combination of rod hitting, rotation and feed,
The rod feed advance speed has increased to a predetermined speed, the rod feed advance flow rate has increased to a predetermined flow rate, the rod feed pressure has decreased to a predetermined pressure, the rod opening depth That the rod drifter rotational pressure has decreased to a predetermined pressure, the rod drifter rotational speed exceeds a predetermined rotational speed, or the rod drifter chain tension is a predetermined tension. The rod is further fed forward for a predetermined time after detecting the start of entry of the rod into the hot metal by detecting either or a combination of either of them, and then the rod is pulled out and flows out from the spout It is characterized in that when the thermal energy of the hot metal reaches a predetermined level, it is judged that the opening of the tap hole has been completed normally. The method of taphole hydraulic perforator. The method of controlling a sprue opening hydraulic opening machine according to claim 1, wherein the control method of the sprue opening hydraulic opening machine according to claim 1 is repeated until the thermal energy of the hot metal reaches a predetermined level . The jamming prevention control is performed, wherein the feed direction is switched when the feed pressure rises to a predetermined pressure, and the feed direction is switched again when the feed pressure drops to the predetermined pressure. A control method for the tap hole hydraulic opening machine according to claim 1.

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