JPH04371507A - Hole opening machine for iron tapping hole - Google Patents

Abstract

PURPOSE:To automatically measure the hole depth of an iron tapping hole with a hole opening machine for iron tapping hole. CONSTITUTION:In the hole opening machine for iron tapping hole, a quantitative type hydraulic actuator 8 for feeding a drilling machine 3 is provided and a flow meter 11 for measuring flow rate of hydraulic oil for driving the actuator 8, means 12 for transmitting starting and completing times of a hole opening and an arithmetic device for calculating and outputting the hole depth L of opened iron tapping hole from the accumulating flow rate Q of hydraulic oil supplied into the feeding actuator 8 from the start of hole opening to the completion of a hole opening, are provided. By this method, the hole depth L of a iron tapping hole is automatically and accurately measured without need to read the scale plate by an operator for the hole opening machine for iron tapping hole.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a taphole opening machine for drilling a taphole in a blast furnace, and more particularly to measuring the depth of a taphole in a blast furnace.

0002

BACKGROUND OF THE INVENTION Measuring and controlling the taphole depth is very important for the operation of a blast furnace. During tapping, hot metal is pushed out of the furnace by the pressure inside the furnace. On the other hand, when hot metal passes through the taphole, pressure loss occurs. Pressure loss increases in proportion to the taphole depth, that is, the length of the taphole. In other words, the amount of pig iron tapped per unit time (referred to as the tap rate) is determined by the point where the pressure inside the furnace and the pressure loss during tapping are balanced. If the tapping speed can be made the same as the hot metal production rate in the blast furnace, continuous tapping operation is possible, but in reality, as the tapping time passes, the refractory material in the tap hole will melt and the hole diameter will expand. Therefore, continuous tapping operation is difficult because the tapping speed increases gradually. However, if the accuracy of the control of the taphole hole depth is improved, it will be possible to bring the tapping rate closer to the hot metal production rate of the blast furnace, increasing the total amount of pig iron per tap, and increasing the tapping rate. It is possible to reduce the number of times of pig ironing (times/day), which brings great benefits such as reducing the operator's workload and saving mud for plugging the tap hole.

[0003] As described above, control of the tap hole depth as a means of bringing the tapping rate close to the hot metal production rate of the blast furnace is very important for the operation of the blast furnace.

[0004] The actual tap hole depth is controlled by increasing or decreasing the amount of mud filled when plugging the tap hole. In other words, the taphole depth (opening length) is measured when the taphole is opened, and if the hole depth is insufficient, the amount of mud to be filled is increased to increase the hole depth. If it is too much, reduce the hole depth by reducing the amount of mud to be filled. In other words, accurate measurement of the taphole depth (the taphole opening length) is required as an index for determining the amount of mud to be filled.

FIG. 3 shows an example of a conventional taphole drilling machine. The hole-drilling tool 2 is held by the hole-drilling machine 3 and given impact and rotation to drill a tap hole 1h in the tap-hole furnace wall 1. The drilling machine 3 is suspended below the guide cell 6, and is fed by the feed air motor 4 installed on the guide cell 6 through the chain wheel 5a and chain 5b. Driven forward and backward. A scale plate 7 is installed on the side of the guide cell 6 for the operator to read the distance traveled by the drilling machine 3. Most conventional taphole drilling machines use compressed air as a driving source, and the drilling machine 3 and air motor 4 shown in FIG. 3 are also driven by compressed air. The tap hole depth is measured when the tap hole 1h is drilled by the tap hole opening machine 2 connected to the hole drilling machine 3. That is, the hole drilling machine 3
Drilling machine 3 when the drilling machine 2 starts drilling by driving forward.
The operator reads the position from the scale plate 7, reads the position when drilling is completed from the scale plate 7, and records the read value. That is, the tap hole opening machine is a machine that opens the tap hole 1h of the furnace wall 1 made of refractory material,
The drilling tool 2 is held and the drilling machine 3 applies impact, rotation, and feed (forward movement) to the drilling tool 2 to drill the tap hole 1h. During drilling, the feed rate is slow, and when the hole is completed, the resistance from the furnace wall becomes smaller, so the feed rate becomes faster. The operator recognizes this change in feed speed and determines when drilling starts and when drilling is completed, and calculates the feed distance (travel distance of the drilling machine 3) during this time to the taphole hole depth (opening distance). hole length). Conventionally, for example, Japanese Patent Application Laid-Open No. 63-62807 discloses an operation control for a taphole drilling machine, but there is no device for automatically measuring the depth of the taphole.

[0006]

[Problem to be Solved by the Invention] As mentioned above, it is important to accurately measure the depth of the tap hole, but since the object to be measured is the depth of the hole drilled in the refractory containing hot metal, Only the above-mentioned measurement method was available, and the problem remained that the measurement was dependent on the operator and lacked accuracy. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a taphole drilling machine equipped with a taphole depth measuring device that can accurately measure the depth of the taphole.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a taphole drilling machine according to the present invention applies impact and rotation to a drilling tool (2) connected to the drilling machine (3). In the taphole drilling machine that drills the taphole (1h) by giving
) The air motor 4, which was conventionally used as an actuator to feed
Hydraulic piping (10) is installed in the guide cell (6) and connects the actuator (8) and the hydraulic unit (9).
) is equipped with a pressure oil flowmeter (11), a signal generation means (12) for generating a hole-opening start signal and a hole-opening end signal, and a hole-opening start signal based on the measurement of the pressure oil flowmeter (11). A calculation means (13) is provided for converting the amount of pressurized oil (Q) supplied to the fixed-rate hydraulic actuator (8) into a hole opening length (L) after the occurrence of the hole opening end signal. Symbols in parentheses indicate corresponding elements or corresponding physical quantities in the embodiments shown in the drawings and described later.

In the embodiments described later, the signal generating means is a pressure switch (12) provided in the hydraulic piping, and the pressure switch (12) is opened ( The switching from OFF) to closed (ON) is used as a drilling start signal, and the pressure switch (12) is turned from ON to OFF due to the pressure drop in the hydraulic piping (10) at the end of drilling.
The signal generation means is a push button switch operated by the operator, and the operator presses the push button after visually determining whether the tap hole opening has started or the end has ended. It can also be used as a thing.

[0009]

[Operation] 1) Attach the drilling tool (2) to the taphole drilling machine (3) and feed pressure oil to the fixed-rate hydraulic actuator (8). ) advances against the furnace wall (1),
The tip of the drilling tool (2) is pressed against the outer surface of the taphole wall. At this time, there is no resistance while the drilling tool (2) moves forward through the space, so the pressure of the pressure oil in the hydraulic pipe (10) is low, but the tip of the drilling tool (2) touches the outer surface of the furnace wall. When pressed, resistance is generated, which increases the pressure of the pressurized oil. At this time, the signal generating means (12) generates a hole drilling start signal. In the embodiment described below, the pressure switch (12) is activated in response to an increase in oil pressure.
) changes from OFF to ON.

2) The advance of the hole drill (3) and the impact and rotation of the hole drill (2) cause the hole drill (2) to enter the furnace wall (1), and the hole progresses inside the furnace wall.

3) At the same time that the tip of the drilling tool (2) penetrates the furnace wall (1), the resistance that the drilling tool (2) was receiving from the furnace wall (1) decreases, and the feed actuator Ta (8)
The oil pressure decreases, and at this time the signal generating means (12) generates a hole drilling completion signal. In the embodiment described below, the pressure switch (12) turns from ON to OFF in response to a decrease in oil pressure.

4) The calculation means (13) is a pressure oil flow meter (1
Based on the measurement in step 1), the amount of pressure oil (Q ) is converted into hole length (L). During hole opening, the metering type hydraulic actuator (8) is supplied with pressure oil proportional to the hole length, so conversely, the cumulative flow rate of the pressure oil supplied to the actuator (8) during hole opening is From (Q), the arithmetic unit (13) calculates the aperture length (L).

[0013] Due to the above-described operation, by adding a simple existing device to a conventional taphole drilling machine, the depth of the taphole can be automatically and accurately measured.

[0014] In the embodiments described later, a pressure oil flow meter (11
), the integrated value is set to 0 by the drilling start signal, and the integrated value is read into the arithmetic unit (13) by the drilling end signal.
1) is an instantaneous flow rate type (representing the flow rate per unit time)
Alternatively, the flow rate detected by the pressure oil flowmeter may be integrated in the arithmetic unit (13) from the generation of the hole-opening start signal until the generation of the hole-opening end signal. That is, the calculation may be performed as cumulative flow rate = Σ (instantaneous flow rate x instantaneous time).

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a side view of a taphole opening machine equipped with a taphole hole depth measuring device of the present invention and a block configuration of a depth measuring system. In the figure, numerals 1, 2, 3, 5, 6, and 7 are the same as those of the conventional taphole opening machine described above, so the description thereof will be omitted here. The feed hydraulic actuator 8 is a piston type hydraulic actuator in which the amount of supplied pressure oil is proportional to the rotation speed of the output shaft.
It is driven by a hydraulic unit 9 and hydraulic piping 10 that supply pressure oil to. A cumulative flow meter 11 is installed in the middle of the hydraulic piping 10.
is connected to measure the cumulative flow rate of the pressure oil supplied to the actuator 8. A pressure switch 1 is attached to the hydraulic pipe 10.
2 are connected. The pressure switch 12 detects the pressure of the feed hydraulic line to the actuator 8 (the line to which high pressure is supplied when the actuator 8 is driven in the forward direction of the drilling machine 3), and the detected pressure is set to a set value. When the value is above, an ON signal is generated, and when the value is less than the set value, an OFF signal is generated and applied to the arithmetic unit 13. The calculation device 13 resets the cumulative value of the cumulative flow meter 11 to 0 when the pressure switch 12 changes from OFF to ON while the drilling machine 3 is being driven forward (more precisely, the cumulative flow rate at that time A total of 11 cumulative values are read in and stored as the base value), and the pressure switch 12 is turned to O.
When the state changes from N to OFF, read the cumulative value of the cumulative flowmeter 11, and calculate the cumulative value Q (to be exact, the cumulative value read - base point value =
Q) is converted into hole length L.

When actually drilling a tap hole using this device, the pressure value of the pressure oil supplied to the feed hydraulic actuator 8 is approximately 10 kg/cm2 when no load is applied, and 7 kg/cm2 when the hole is opened.
0 kg/cm2 or more, and approximately 30 kg/cm2 when the hole is finished. Therefore, set value A to be set on pressure switch 12 to 5.
If it is set to about 0 kg/cm2, and the pressure value of the pressure oil is B, if A>B, the pressure switch 12 will generate an OFF signal, which indicates no load or the completion of hole opening, and if A≦B, the pressure switch 12 will generate an OFF signal. An ON signal is generated, which indicates that the hole is being drilled. The calculation device 12 receives a signal from the pressure switch 12, and when the signal is switched from ON to OFF, the calculation device 12 turns ON (A≦B
) is read, and the cumulative flow rate Q of the pressure oil supplied to the feed metering type hydraulic actuator 8 is read, and the cumulative flow rate Q is calculated.
The opening length L is calculated from the equation and displayed as the measurement result of the taphole depth. Note that in this embodiment, the metering type hydraulic actuator 8 for feeding is replaced with a piston type hydraulic actuator.
However, it can also be replaced with a hydraulic cylinder or the like.

FIG. 2 shows a flowchart of the operation of measuring the length of the taphole during drilling, using the taphole drilling machine shown in FIG. The following is an explanation using a flowchart. First, the guide cell 6 is set on the tap furnace wall 1, and then the feed actuator 8 starts moving forward. The feed actuator 8 moves forward when the operator presses a switch, and by this operation, the drilling machine 3 equipped with the drilling tool 2 moves the feed fixed-rate hydraulic actuator 8. The hole drilling tool 2 is driven forward and pressed against the outer surface of the taphole furnace wall 1 at the position where the hole is to be drilled. (Step 101) At this time, while the drilling tool 2 is moving forward in the space, there is no resistance, so the pressure of the pressure oil is small, but when the tip of the drilling tool 2 is pressed against the outer surface of the furnace wall 1, there is resistance. As a result, the pressure of the pressurized oil increases.

When the pressure switch 12 detects an increase in hydraulic pressure and the detected pressure B becomes higher than the preset pressure A (A≦B), the pressure switch 12 switches its output signal from OFF to ON (step 102). This O
Switching from FF to ON means the start of opening the tap hole. In response to this, the arithmetic unit 13 reads the cumulative flow rate of the flow meter 11 at that time and stores it as a reference value (step 103). This corresponds to resetting the cumulative flow rate of the flow meter 11.

Impact, rotation, and feed (forward) to the drilling tool 2
Drill the hole by giving While the hole is being opened, the fixed-rate hydraulic actuator 8 is supplied with pressure oil proportional to the length of the hole, and the flow meter 11 accumulates the amount of pressure oil supplied. At the same time as the tip of the drilling tool 2 penetrates the furnace wall 1, the resistance that the drilling tool 2 was receiving from the furnace wall 1 decreases, and the hydraulic pressure of the feed actuator 8 decreases (A>B). Pressure switch 1 in response
2 turns its output from ON to OFF (step 10
4). This switching of the signal means that the taphole opening has been completed, and in response to this, the arithmetic unit 13
The cumulative flow rate of 1 is read (step 105).

The calculation device 13 calculates the cumulative flow rate Q during the hole opening (value read in step 105 - value read in step 103), and converts this cumulative flow rate Q into the hole length L=α・Q
(step 106). α is a conversion coefficient (feed distance of the drilling machine 3 with respect to unit flow rate of pressure oil). After calculating the aperture length L, the arithmetic device 13 displays this on a display, and prints it out if a printer is provided. (Step 107).

[0021]

[Effects of the Invention] Control of the taphole depth is very important for the operation of a blast furnace, and control of the hole depth requires accurate measurement results of the hole depth. Conventionally, the measurement of hole depth depended on the operator and lacked accuracy, but by using a taphole drilling machine equipped with the taphole hole depth measuring device of the present invention, it is possible to measure the hole depth. Depth measurement is performed automatically and accurately, improving the accuracy of taphole depth management, reducing the number of taphole openings, reducing the cost of wear and tear on drilling tools, and plugging the taphole hole. This greatly helps in reducing not only the mud cost but also the amount of tapping work and making the working environment more comfortable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of a mechanism section and an electrical instrumentation section in an embodiment of the present invention.

FIG. 2 is a flowchart showing a hole length measuring operation of the tap hole drilling machine shown in FIG. 1;

FIG. 3 is a side view showing one conventional tap hole opening machine.

[Explanation of symbols]

1: Taphole furnace wall 1h
: Taphole 2: Drilling tool
3: Drilling machine 4: Feed air motor
5a: Chain wheel 5b: Chain
6: Guide cell 7: Scale plate 8: Piston type hydraulic actuator (quantity type hydraulic actuator) 9: Hydraulic unit 10:
Hydraulic piping 11: Cumulative flow meter
12: Pressure switch 13: Arithmetic device

Claims (1)

[Claims] Claim 1: A drilling tool, a drilling machine connected to the drilling tool and applying impact and rotation to the drilling tool, a guide cell that supports the drilling machine, and a quantitative hydraulic actuator that controls the drilling machine. a drive means for moving the hole forward and backward along the metering type hydraulic actuator, a pressure oil flowmeter for measuring the amount of pressure oil supplied to the metering type hydraulic actuator, a signal generating means for generating a hole opening start signal and a hole opening end signal, and A calculation for converting the amount of pressurized oil supplied to the quantitative hydraulic actuator from the time when the hole-opening start signal is generated until the hole-opening end signal is generated based on the measurement of the pressure oil flowmeter into the hole length. A taphole opening machine comprising means.