JPH08232006A - Boring machine for tap hole - Google Patents

Abstract

PURPOSE: To keep the smooth hole shape to a tap hole and to eliminate an oxygen opening ratio by regulating the hitting, rotation and feeding range necessary to the hole opening in every working process in a boring machine for tap hole used to the slag tapping work in a blast furnace. CONSTITUTION: At the time of keeping the smooth hole shape to the tap hole 1, in the boring machine for tap hole, a hydraulic unit 8 using non-combustible oil for obtaining the prescribed function of the hitting, rotation and feeding, etc., necessary to the boring work is provided with plural pieces of hydraulic pressure adjusting valves and oil quantity adjusting meters settable to a condition to be suitable to an individual output in a hydraulic piping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforator for use in tap tap opening in tapping work in a blast furnace.

[0002]

2. Description of the Related Art During tapping work in a blast furnace, tapping of the blast furnace is repeated in the order of taphole opening (starting tapping), tapping, and tapping plug closing (completing tapping). ing. this house,
Regarding the opening of the tap hole, there are two types of opening machines shown in Table 1, which are a pneumatic type having a domestic blast furnace installation rate of 95% or more and a hydraulic type disclosed in Japanese Examined Patent Publication No. 4-371507.

[0003]

[Table 1]

FIG. 3 shows the procedure of opening holes using these tap hole opening machines. In the figure, the use range of the tap hole opening machine is shown by a shaded portion.

Two methods have generally been used for the opening operation. 1. Pre-opening: Perform pre-opening immediately after closing the tap hole,
A method of tapping after a certain period of time and immediately before starting tapping, by further opening holes. 2. One-shot opening: A method of opening a hole after a certain time has elapsed after closing the taphole and immediately before the start of tapping.

Of these opening methods, one-shot opening has been considered to be an ideal method for reducing the work load. The condition for one-shot opening is that the opening is after a certain period of time, so the filling material (mud) used to close the tap hole
Is heated to 600 to 1200 ° C. in the tap hole, it is necessary to smoothly perform the opening in the red hot state.

In the pneumatic type, it is difficult to stably supply the pressure and flow rate of the air which is the power source, the function originally possessed by the perforator cannot be sufficiently exerted, and the perforation capability in the red hot state is required. There was a limit to.

The hydraulic type was developed in consideration of the one-shot opening which was a problem, but the one-shot opening is possible because the striking force and the rotating force are increased, but the striking force is strong. The state of the tap hole has a drawback that the tapping time cannot be extended due to the occurrence of cracks and the like.

Therefore, in the conventional tap hole punching machine, pre-drilling has been carried out as the next best measure despite the large work load. As a result, the rate of hole opening by oxygen, which is performed manually, does not decrease, and the reduction of the burden of tap hole opening work is not improved.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the problems of the conventional taphole opening machine described above, and it is possible to smoothly perform tapping without destroying the taphole filler. It is an object of the present invention to provide a tap hole opening machine capable of maintaining the shape of the hole at the mouth and smoothly performing all the operations with no oxygen opening rate.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a taphole opening machine equipped with a striking, rotating and feeding mechanism required for each work step of opening a hole.

(1) A blast furnace taphole is installed at the rear end of the guide cell to feed and rotate the punching tool held by the punching machine and feed the punching tool back and forth along the guide cell. In a tap hole punching machine that opens holes, a hydraulic unit that uses non-combustible oil to drive the striking mechanism, rotating mechanism, and feed mechanism of the punching machine, and a plurality of hydraulic control valves and hydraulic pipes in the hydraulic piping of the hydraulic unit. And is provided.

(2) In the taphole opening machine described in (1), the maximum impact force is 50 kgm and the maximum impact number is 4000 b.
pm, impact force of 38-50 kgm and 2900
~ 400 bpm hits, or 25-38 kgm hits and 2500-3600 bpm hits, or 10-25 kgm hits and 1800-3200 bp
Has a striking mechanism consisting of a hydraulic cylinder that can switch the striking number of m in 3 stages, and the maximum rotational force is 80 kg.
m, the maximum rotation speed is 400 rpm, 55-80 k
Rotational force of gm and rotation speed of 100 to 260 rpm, or rotation force of 30 to 55 kgm and 180 to 340 rpm
Rotation speed of 10 to 30 kgm and 270
It has a rotating mechanism consisting of a hydraulic motor capable of switching the number of rotations up to 400 rpm in three stages, the maximum pressing force is 8000 kg, and the maximum feed speed is 25,000 mm / mi.
n, the pressing force of 4000-8000 kg and 20
Feed rate of 00-8000 mm / min, or 120
Pressing force of 0 to 4000 kg and 1000 to 4000 mm
/ Min feed rate, or 200-2000 kg pressing force and 100-1000 mm / min feed rate, or 0-100 kg pressing force and 1000-25000
It is characterized by having a feed mechanism composed of a hydraulic motor capable of switching the feed rate of mm / min in four stages.

[0014]

[Operation] As shown in FIG. 3, the tapping by the tap hole punching machine is performed by feeding a gold rod, counterboring, opening (one-shot opening, pre-opening),
There is a withdrawal process, and each process includes impact, rotation, and
It is a combination of feeding. The present inventors have developed a test apparatus capable of filling, firing, and opening holes by using the taphole filler and the similar furnace material that are actually used in the blast furnace, and as shown in Tables 2 to 4, I got a lot of knowledge.

1. Impact effect (constant rotation and feed)

[Table 2] 1) The impact force should be such that it weakly vibrates within a range that does not collapse the taphole filler. 2) It is preferable to increase the number of hits so that a fine crack is formed in the taphole filler. 3) If the opening time is 2-3 minutes, the opening speed is 160
It is possible to deal with 0 mm / min.

In order to obtain a low striking force and a high striking number, the target numerical values were made possible by changing the diameter and stroke of the striking cylinder.

2. Effect of rotation (performing constant blow and feed)

[Table 3] 1) The rotational force is preferably set in a weak range where the taphole filler can be cut. 2) A good hole shape can be obtained by increasing the number of rotations.

In order to obtain a low rotational force and a high rotational speed, the target numerical value was made possible by changing the volume per one revolution of the hydraulic motor.

3. Effect of feeding (performed with constant impact and rotation)

[Table 4] 1) The pressing force is preferably set in a range that does not hinder the cutting state due to impact and rotation. 2) It is preferable that the feed rate is such that there is no delay in the assumed drilling speed. In order to obtain low rotational force and high rotational speed, 1 of hydraulic motor
The target value was made possible by changing the volume per rotation.

From the results of the individual characteristics, it was found that the conditions for opening the taphole filler at a constant speed while maintaining the shape of the hole smoothly without collapsing the taphole filler in the hole opening operation were: Rotation and feed have independent functions, but they do not work individually,
The openings must be promoted while complementing each other.

From the above knowledge, it has been found that the tapping hole punching machine capable of smoothly tapping the tapping hole has a limited generating force of the striking, rotating and feeding mechanism.

(1) Gold bar feeding step In this step, a gold rod, which is a drilling tool, is fed to the opening position,
Alternatively, since it is a step of retracting from the opening position, only the feeding mechanism may be used and the pressing force of the feeding mechanism may be small,
The feed rate needs to be high to reduce the time. Therefore, the hydraulic motor of the feed mechanism needs to generate a pressing force of 0 to 100 kg and a feed rate of 1000 to 25000 mm / min.

(2) Counterbore Process In the counterbore process before the opening, it is necessary to cut the guide hole at the time of opening without collapsing the taphole filler by using the rotation and feed mechanism. As a result of repeating the cutting test, 10 to 30k
Rotate the drilling tool with a rotating force of gm and a rotating speed of 270 to 400 rpm, and a pressing force of 200 to 2000 kg and 1
It was found that a good spot facing shape can be obtained by feeding at a feed rate of 0 to 1000 mm / min. Rotating force of less than 10kgm and 270r in counterbore process
RPM less than pm, pressing force less than 200 kg and 100
If the feed rate is less than mm / min, the bit 6 at the tip of the drilling tool is notoriously worn because wear is severe and a good hole shape cannot be obtained. Further, a rotational force of more than 30 kgm, a rotational speed of more than 400 rpm, a pressing force of more than 2000 kg, and a feed rate of more than 1000 mm / min are not preferable because cracks occur in the taphole filler.

(3) Hole Opening Step The hole opening of the tapping filler is carried out by the striking, rotating and feeding mechanism of the tapping machine.

(3-1) Pre-opening process The tap hole after tapping the hot metal is closed by filling the filler with a mud gun, and the length of the tap filler at the tap is the furnace. It is usually 3.5 to 4 m in the inward direction, and it becomes difficult to form a hole when dried and solidified. Therefore, the step of pre-opening up to a depth of about 3 m after the filling material is enclosed and before the filling material is solidified is called pre-opening. As a result of repeatedly performing the pre-opening test with the punching tool of the tap hole punching machine, the punching tool was hit with a striking force of 25 to 38 kgm and a striking number of 2500 to 3600 bpm, and a rotating force of 30 to 55 kgm and 180
Spin the drilling tool at ~ 340 rpm and 1200
~ 4000kg pressing force and 1000 ~ 4000mm /
It has been found that good drilling can be performed by sending a drilling tool at a feed rate of min.

In the pre-drilling step, a punching tool with a striking force of less than 25 kgm and a striking number of less than 2500 bpm, a rotating force of less than 30 kgm and a rotating number of less than 180 rpm, a pressing force of less than 1200 kg and a feed rate of less than 1000 mm / min. It is not preferable because the tip bit 6 is heavily worn due to wear and the opening work takes a long time. Also,
Impact force over 38 kgm and number of impacts over 3600 bpm,
Rotational force over 55 kgm and rotation speed over 340 rpm, 4
A pressing force of more than 000 kg and a feed rate of more than 4000 mm / min are not preferable because the filler material at the taphole is cracked and the filler is damaged during tapping. Note that the opening in this case is performed after a predetermined time has elapsed after the pre-opening.

(3-2) Single-shot opening A single-shot opening is to open the taphole after a certain period of time after the filler is sealed with a mud gun and closed. In this case, since the filler material at the taphole is solidified solidly, cracks are generated in the filler material when the taphole is opened unless the tool for punching and rotating smaller than the pre-opening hole is applied. Therefore, as a result of repeating the one-shot opening with the drilling tool of the tap hole opening machine, 1
Impact force of 0 to 25 kgm and 1800 to 3200 bpm
Striking with a punching tool with a hammering number of 10 to 30 kgm, rotating the drilling tool with a rotating force of 10 to 30 kgm and a rotating number of 270 to 400 rpm, pressing force of 1200 to 4000 kg and 1000
It has been found that good drilling can be performed by sending the drilling tool at a feed rate of ~ 4000 mm / min.

In the one-shot opening step, when the impact force is less than 10 kgm, the number of impacts is less than 1800 bpm, the rotational force is less than 10 kgm, the rotational speed is less than 270 rpm, the pressing force is less than 1200 kg, and the feed rate is less than 1000 mm / min, the drilling is performed. It is not preferable because the bit 6 at the tip of the tool is heavily worn and wears out and the drilling work takes a long time. Also,
Impact force of more than 25 kgm and number of impacts of more than 3200 bpm,
Rotational force over 30 kgm and rotation speed over 400 rpm, 4
A pressing force of more than 000 kg and a feed rate of more than 4000 mm / min are not preferable because the filler material at the taphole is cracked and the filler is damaged during tapping.

(3-3) Emergency Opening Process When molten iron is mixed with the filler when the tap hole is closed by the mud gun, the filler is further solidified, so that under normal impact, rotation and feed conditions. Can't open holes. The opening in such a state is called an emergency opening. As a result of repeated emergency drilling with the drilling tool of the tap hole puncher, 38-50
Striking with a punching tool with a striking force of kgm and a striking number of 2900 to 4000 bpm, rotating the punching tool with a rotating force of 55 to 80 kgm and a rotating number of 100 to 260 rpm,
Pressing force of 4000-8000 kg and 2000-800
It has been found that good drilling can be performed by sending a drilling tool at a feed rate of 0 mm / min.

In the emergency drilling process, when the impact force is less than 38 kgm, the number of impacts is less than 2900 bpm, the rotational force is less than 55 kgm, the rotational speed is less than 100 rpm, the pressing force is less than 4000 kg, and the feed rate is less than 2000 mm / min, the punching tool is used. It is not preferable because the tip bit 6 is heavily worn due to wear and the opening work takes a long time. Also,
Impact force over 50 kgm and number of impacts over 4000 bpm,
Rotational force over 80 kgm and rotational speed over 260 rpm, 8
A pressing force of more than 000 kg and a feed rate of more than 8000 mm / min are not preferable because the filler material at the taphole is cracked and the filler is damaged during tapping.

For the above reasons, the tap hole opening machine of the present invention has a maximum impact force of 50 kgm and a maximum impact number of 4000 b.
pm, impact force of 38-50 kgm and 2900
-4000 bpm impact number, or 25-38 kgm impact force and 2500-3600 bpm impact number, or 10-25 kgm impact force and 1800-3200 bp
Has a striking mechanism consisting of a hydraulic cylinder that can switch the striking number of m in 3 stages, and the maximum rotational force is 80 kg.
m, the maximum rotation speed is 400 rpm, 55-80 k
Rotational force of gm and rotation speed of 100 to 260 rpm, or rotation force of 30 to 55 kgm and 180 to 340 rpm
Rotation speed of 10 to 30 kgm and 270
It has a rotating mechanism consisting of a hydraulic motor that can switch the number of rotations up to 400 rpm in three stages, the maximum pressing force is 8000 kg, and the maximum feed speed is 25,000 mm / mi.
n, the pressing force of 4000-8000 kg and 20
Feed rate of 00-8000 mm / min, or 120
Pressing force of 0 to 4000 kg and 1000 to 4000 mm
/ Min feed rate, or 200-2000 kg pressing force and 100-1000 mm / min feed rate, or 0-100 kg pressing force and 1000-25000
It is characterized by having a feed mechanism composed of a hydraulic motor that can generate a feed rate of mm / min in four stages.

Here, the hydraulic unit of the striking, rotating and feeding mechanism is provided with independent hydraulic pipes so as to satisfy the above-mentioned conditions, and the optimum condition of each process can be easily realized by a system in which the hydraulic valves are switched. Can be set to.

Further, since the hydraulic unit of the taphole opening machine of the present invention is used in the vicinity of high temperature hot metal, ISOVG46
It is essential to use non-combustible oil such as a comparable product to drive the hydraulic unit.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The equipment configuration implemented in the present invention is shown in FIGS. The outline structure of the tap hole opening machine is the guide channel 4
The punching unit 2 attached to the punching unit takes charge of hitting and rotating, and the feeding unit 3 takes charge of moving the punching unit 2 forward and backward with respect to the tap hole 1. The power source of these devices is used by boosting the pressure of non-combustible hydraulic oil stored in the hydraulic unit 8 with a pump and guiding it to each hydraulic cylinder and hydraulic motor via the hydraulic pipe 7. The output generated in this way is
The holes 5 are transmitted to the rod 5 and the bit 6 to perform the opening work.

The adjustment of each output, which is a feature of the present invention, will be described by taking an impact operation as an example. The control valves a1 to a4 (13-12 to 13-4) in which the striking hydraulic pipe 12 is installed are set to the set values corresponding to the intended work. That is, the hydraulic pressure is set to 100 kg / cm ² and the oil amount is set to 80 liter / min for the one-shot hole, and the hydraulic pressure is set to 140 kg / cm ² and the oil amount is set to 100 liter / min for the pre-opened hole. .

1. Example of one-shot opening Blow control valve a1 (13-1), rotation control valve b1 (16-
1) Set an oil pressure and an oil amount corresponding to the set values in the feed control valve b1 (19-2). The results of opening are shown in Table 5.

[0037]

[Table 5]

By increasing the number of hits, a better taphole shape can be obtained.

2. Example of pre-opening Impact control valve a1 (13-2), rotation control valve b1 (16-
2) Set the oil pressure and the oil amount corresponding to the set value in the feed control valve b1 (19-3).

The results of opening are shown in Table 6.

[0041]

[Table 6]

3. Counterbore Example Each impact control valve a1 to a4 (13-2 to 4) is not operated. Rotation control valve b1 (16-1), feed control valve b1
For (19-1), set the oil pressure and the oil amount corresponding to the set values.

The results of opening are shown in Table 7.

[0044]

[Table 7]

Table 8 shows an example of the basic use and setting of the tap hole punching machine for each drilling operation based on the above embodiment.

[0046]

[Table 8]

[0047]

As described above, according to the present invention,
It became possible to open a tap hole smoothly under any circumstances. As a result, the oxygen porosity became almost zero, and the load before the furnace work was reduced, which contributed to the extension of the tapping time and the reduction of the basic unit of tapping filler.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a taphole opening machine according to the present invention.

FIG. 2 is a schematic block diagram of a taphole opening machine according to the present invention.

FIG. 3 is an explanatory view of a hole opening procedure performed by using a conventional tap hole opening machine.

[Explanation of symbols]

 1 tap hole 2 punching machine (built-in striking and rotation mechanism) 3 feeder 4 guide cell 5 rod 6 bit 7 hydraulic piping 8 hydraulic unit 9 non-flammable oil 10 tap tap filling material 11 striking cylinder 12 striking hydraulic piping 13- 1 Impact Control Valve a1 13-2 Impact Control Valve a2 13-3 Impact Control Valve a3 13-4 Impact Control Valve a4 (Reverse Impact) 13-5 Impact Control Valve a5 (Reverse Impact) 14 Rotation Motor 15 Rotation Hydraulic Pipe 16- 1 rotation control valve b1 16-2 rotation control valve b2 16-3 rotation control valve b3 17 feed motor 18 feed hydraulic piping 19-1 feed control valve c1 19-2 feed control valve c2 19-3 feed control valve c3 19-4 Feed control valve c4 19-5 Feed control valve c5 (reverse) 19-6 Feed control valve c6 (reverse)

Claims (2)

[Claims] 1. A tapping hole of a blast furnace having a feed motor, which is provided at the rear end of the guide cell, for feeding and rotating the punching tool held by the punching machine, and feeding the punching tool back and forth along the guide cell. In a tap hole punching machine that punches holes, a hydraulic unit that uses non-combustible oil to drive the striking mechanism, rotating mechanism, and feeding mechanism of the punching machine, and a plurality of hydraulic control valves and hydraulic piping in the hydraulic piping of the hydraulic unit. A tap hole opening machine characterized by being provided with. 2. The tap hole opening machine according to claim 1, wherein the maximum impact force is 50 kgm, the maximum impact number is 4000 bpm, the impact force is 38 to 50 kgm, and 2900 to 40.
The number of hits of 00 bpm, or the hitting force of 25 to 38 kgm and the number of hits of 2500 to 3600 bpm, or 10
It has a striking mechanism consisting of a hydraulic cylinder that can generate a striking force of 25 kgm and a striking number of 1800-3200 bpm in three stages, and has a maximum rotation force of 80 kgm and a maximum rotation number of 400 rpm, and a rotation of 55-80 kgm. Force and rotation speed of 100-260 rpm, or 30
-55 kgm rotational force and 180-340 rpm rotational speed, or 10-30 kgm rotational force and 270-40
It has a rotating mechanism consisting of a hydraulic motor that can switch the number of revolutions at 0 rpm in three stages, and the maximum pressing force is 80
00kg, the maximum feed rate is 25000mm / min, the pressing force of 4000-8000kg and 2000-
Feed rate of 8000 mm / min, or 1200-4
Pressing force of 000 kg and 1000-4000 mm / mi
n feed rate, or 200-2000 kg pressing force and 100-1000 mm / min feed rate, or 0
~ 100kg pressing force and 1000 ~ 25000mm /
A tap hole punching machine having a feed mechanism composed of a hydraulic motor capable of generating a min feed rate in four stages.