JP4276663B2 - Automatic control method of hydraulic opening machine for blast furnace outlet - Google Patents

Description

    The present invention relates to a method for controlling a blast furnace outlet opening machine.

  In the blast furnace operation for iron making, the tap hole is opened with a hole opening machine for taping. For example, Patent Document 1 describes a tap hole opening machine shown in FIG. In FIG. 4, the tap hole opening machine holds the conical rod 2 by the opening machine 1, hits and rotates the opening machine 1, is provided on the guide cell 3, and is provided from the hydraulic unit 4. The opening machine 1 is driven forward and backward by a feed motor 5 driven by hydraulic pressure to open the blast furnace outlet 6. 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. The operation feed amount during the hole opening operation is always measured with the pressure gauge 9, and the depth measurement of the tap hole 6 is performed.

  FIG. 5 is a flowchart showing the control of the tap hole opening machine. When the opening operation starts (step 1), the hydraulic pressure is detected by the pressure gauge (step 2).

  The detected pressure is input to the arithmetic unit, and it is determined whether or not the detected pressure B is equal to or higher than the set pressure A (step 3). If the detected pressure B is equal to or lower than the set pressure, the tip of the cone rod has not reached the filling at the spout, so it returns to step 1 and step 2 and is sent as it is. Send the conical rod until it reaches.

  When the tip of the conical rod reaches the filling at the spout while the conical rod is being fed, since the detected pressure B exceeds the set pressure A, the position detection value is set to 0 (step 4) and counting is started.

The forward feed is performed while visually confirming whether the feed is normal and whether the conical rod is bent. Meanwhile, the number of pulses is integrated (step 5). When opening is completed, the output start signal is turned on (step 6), the opening depth is calculated from the integration of the number of pulses (step 7), and the calculation result is output. Displayed (step 8).
JP-A-6-322420

  However, since the punching machine manually controls the feed rate of the conical rod so that the conical rod does not buckle, when the hardness and strength of the spout filler change and the hole resistance is large Incomplete control may result in conical rod bending and severe wear on the cone tip of the cone rod.

  In addition, since the batting control is performed manually while visually checking the feed shortage, when the feed resistance is small, the batting machine in the drilling machine is in an idle driving state, resulting in a reduction in the life of the equipment and damage. .

  Furthermore, since detection of the opening depth of the opening machine and a rapid increase in the forward speed are visually confirmed after the detection of the start of opening, there is a case where a time delay occurs and an accurate response may not be possible.

  Furthermore, since it is a pre-furnace operation that is manually operated while an operator visually observes the forward speed of the hole opening machine, there is a drawback that it is a high-temperature operation and is dangerous, and the work environment becomes dirty due to dust.

  The present invention prevents buckling and blanking of the drill rod of the hole drilling machine, speeds up the hole drilling work and improves the accuracy of the tap hole depth, and enables the remote hole work by automating the hole drilling work. Thus, a hole opening machine control method capable of freeing from work in a bad environment is provided.

The present invention relates to a hydraulic opening machine for a blast furnace outlet that gives an impact and rotation to an opening machine that holds a conical rod, and that opens and closes the opening machine by a hydraulically driven feed motor. An automatic control method,
(1) A step of detecting a feed load with a detection pressure of hydraulic pressure, a step of continuing striking if the detected pressure is greater than or equal to a set value for detecting a striking, And the step of stopping the blow.

(2) The step of detecting the feed load with the detection pressure, and the position detection value is set to 0 when the detection pressure exceeds the upper limit set value for detecting that the filling has reached the outlet, and the position is detected from this position. And the step of calculating the hole depth, and the step of stopping the feeding of the cone rod when the hole depth becomes equal to or higher than a set value by position detection and becomes lower than the lower limit set value for detecting that the detection pressure is opened; If the detected pressure is greater than or equal to a set value for detecting a hit while the cone rod is being fed, the step includes continuing the hit, and if the detected pressure is equal to or lower than the set value, stopping the hit.

  According to the feed control of the present invention, the excessive feed force that leads to the buckling of the conical rod can be automatically prevented, so that the buckling can be surely prevented and the opening operation can be speeded up.

  Further, idling can be prevented automatically and reliably, and damage to the device can be reduced and the life can be extended. Furthermore, the hole opening work can be automated to enable remote work, freeing you from work in adverse environments.

  FIG. 3 is a flowchart of automatic feed control.

  When the feed starts, the conical rod rotates while the feed motor rotates, and the hydraulic load of the hydraulic unit that drives the feed motor is detected by the pressure gauge (step 101).

  The detected pressure is input to the arithmetic unit, and it is determined whether or not the detected pressure A is equal to or higher than the upper limit set value F1 of the feed load (step 102). If the detected pressure A is equal to or less than the upper limit set value F1, the cone rod is fed while rotating as it is because the feed load is less likely to cause buckling, and the cone rod is fed by repeating Step 101 and Step 102.

  If the detected pressure A exceeds the upper limit set value F1 during feeding of the cone rod, the feed load may cause buckling. Therefore, the feed motor is stopped to stop the cone rod from moving forward, and in some cases, the cone rod is retracted. (Step 103).

  While rotating the cone rod while the cone rod is stopped, the hydraulic load is detected (step 104), and it is determined whether or not the detected pressure A is equal to or lower than the lower limit set value F2 (step 105). If the detected pressure A is equal to or lower than the lower limit set value F2, the cone rod returns to Step 101 and Step 102 while being rotated and is sent.

  The reason why the lower limit set value F2 is set to be equal to or less than the set value F1 is to return to step 101 and step 102 to advance the cone rod below the feed load at which buckling does not occur.

  If the detected pressure A exceeds the set value F2, step 104 for detecting the hydraulic load again and step 105 for determining whether the detected pressure A is equal to or lower than the set value F2 are repeated. When the value is less than the set value F2, the process returns to step 101 and step 102 to start sending.

  Through the above steps, the feed load is detected. When the load reaches the upper limit set value F1 for occurrence of buckling, the feed is stopped and only the rotation is continued. When the feed load drops below the lower limit set value F2, the feed is resumed. To do. This prevents an excessive feeding action that causes buckling of the conical rod.

Automatic Strike Control FIG. 1 is a flowchart of automatic strike control in the control method of the present invention.

  When the hitting starts, the conical rod hits the filling of the tap hole with the hitting device. The hydraulic load at that time is detected (step 111).

  The detected pressure is input to the arithmetic unit, and it is determined whether or not the detected pressure A is equal to or less than the set value D1 for impact (D2 in the case of reverse impact) (step 112). If the detected pressure A is equal to or higher than the set value D1 (D2), the batting is effectively performed, and the batting is not performed, so that the batting is continued by returning to step 111 and step 112.

  When the detected pressure A is equal to or lower than the set value D1 (D2), the hitting is not performed effectively, and there is a possibility that the hitting may occur. Therefore, the hitting is stopped (step 113). Thereafter, when the detected pressure A recovers, the batting is resumed. By this control, it is possible to prevent the striker from being idle.

Control of Hole Depth FIG. 2 is a flowchart of the control method of the present invention. When the hole opening operation is started, the feed rod rotates and feeds the cone rod, and the hydraulic load of the hydraulic unit that drives the feed motor is detected by the pressure gauge (step 131).

  The detected pressure is input to the arithmetic unit, and it is determined whether or not the detected pressure A is equal to or lower than the upper limit set value P1 (step 132). If the detected pressure A is equal to or lower than the upper limit set value P1, the tip of the conical rod has not reached the filling at the spout, so it returns to step 131 and step 132 and is sent as it is rotated. Repeat steps 131 and 132 to feed the conical rod until the mouth filling is reached.

  If the tip of the cone rod reaches the filling at the spout while the cone rod is being fed, the detection pressure A exceeds the upper limit set value P1, so the position detection value is set to 0 (step 133), and the position is detected from this position. Is started and the hole depth is calculated. Simultaneously with the position detection, the cone rod moves forward while performing the automatic feed control in steps 101 to 105 and the automatic direct hit control in steps 111 to 112, and it is calculated whether or not the detected position is equal to or greater than the set position. Along with (Step 134), hydraulic load detection is performed, and it is calculated whether or not the detected pressure A is equal to or lower than the lower limit set value P2 (Step 135).

  When the detection position becomes equal to or greater than the set position in step 134 and the tip of the cone rod passes through the spout in step 135 and the detected pressure A decreases and becomes lower than the lower limit set value P2, the AND circuit 136 determines the hole depth. , Stop feeding the conical rod and stop the normal hitting. Thereafter, the conical rod enters a retreating operation to be pulled out from the spear opening, and retreats while performing automatic reverse hitting control.

It is a flowchart of the automatic impact control in the control method of the present invention. It is a flowchart of the control method of this invention. It is a flowchart of automatic feed control. It is a general view of a conventional tap opening machine. It is a flowchart which shows control of the conventional tap hole opening machine.

Explanation of symbols

1: Opening machine
2: Conical rod
3: Guide cell
4: Hydraulic unit 5: Feed motor 6: Blast furnace outlet 7: Pulse generator 8: Arithmetic unit 9: Pressure gauge

Claims (2)

This is an automatic control method for a hydraulic opener at the blast furnace outlet where the hole opener holding the conical rod is blown and rotated, and the hole opener is driven forward and backward by a hydraulically driven feed motor. There,
Detecting the feed load with the detected pressure of the hydraulic pressure;
If the detected pressure is equal to or higher than a set value for detecting a hit, a step of continuing the hit;
If the detected pressure is equal to or lower than the set value, an automatic control method for a hydraulic opening machine for a blast furnace outlet including the step of stopping the hitting. This is an automatic control method for a hydraulic opener at the blast furnace outlet where the hole opener holding the conical rod is blown and rotated, and the hole opener is driven forward and backward by a hydraulically driven feed motor. There,
Detecting the feed load with the detected pressure;
A position detection value is set to 0 when the detection pressure exceeds the upper limit setting value for detecting that the filling has reached the filling port, the position detection is started from this position, and the hole depth is calculated;
A step of stopping the feed of the cone rod when the hole depth is equal to or greater than a set value by position detection and the detected pressure is equal to or lower than a lower limit set value for detecting opening;
If the detected pressure is greater than or equal to a set value for detecting a hit while feeding the cone rod, the step of continuing the hit;
If the detected pressure is equal to or lower than the set value, an automatic control method for a hydraulic opening machine for a blast furnace outlet including the step of stopping the hitting.

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