JPS60135508A - Method for opening tap hole of blast furnace by oxygen lance - Google Patents

Abstract

PURPOSE:To release man from high heat and heavy physical labor operation and to enable a safe and efficient hole opening operation by mechanizing feeding of a lance which is pressed to a tap hole, and blows O2 thereto to open the hole and specifying the feed speed thereof. CONSTITUTION:An O2 lance 2 is fed into a tape hole 1 by, for example, an air motor 12 and the load of which the upper limit is about the extent to prevent buckling of the lance is set as a driving source for the lance 2. The lance is so driven that the lance 2 stops within said range and is again advanced when the load is released. The feed speed of the lance 2 is specified at the speed higher than the burning and melting speed of a mandrel 11a in a tap hole 1 added with the melting speed of the lance 2 itself. When the lance 2 which supplies O2 is fed into the hole 1 at the above-described speed, the lance 2 collides against the mandrel 11a and the set load acts on the lance 2 to stop the same. The mandrel 11a burns and melts during this time and a gap is generated between the mandrel 11 and the lance 2 then again the lance 2 is started and a series of such operations are repeated, by which the hole is opened.

Description

Detailed Description of the Invention Field of the Invention The present invention relates to a method for opening holes in a blast furnace taphole using an oxygen lance V.

PRIOR ART Conventional taphole opening is carried out using a metal rod or oxygen as described in the literature [Pigmaking and Steel Making Methods-1 (edited by the Iron and Steel Institute of Japan), page 72]. J (II) During actual operation, when drilling a hole with a drill or metal rod attached to the hole-drilling device, a metal rod that has been bent into the taphole or a metal rod that has been embedded in advance may be removed. If the oxygen lance 2 breaks, as shown in Figure 1, the oxygen 3 is ejected from the tip of the ocular lance 2.
Heating and oxidizing the tip of the
The metal rod 11a in the tap hole l shown in the figure is melted and burned to completely open the hole.

This hole-opening method is carried out from the obtained VL, and will be briefly explained as follows. Operator A is in front of taphole l and feeds oxygen lance 2 into taphole l, operator B is in charge of holding and feeding the middle part of oxygen lance 2, and operator C is in charge of operating oxygen valve 4. Operator E connects the drill bit 10 of the existing drilling machine 8 and the metal bar cord]
My husband does the work of putting on and taking off the clothes 4 times.

In the conventional method of opening oxygen holes as described above, () all the work is done manually, requiring a large number of workers, and the work is high heat, strenuous, and dangerous.

(2) Operator A requires a high degree of skill, and depends on operator A's hole-opening time and the degree of damage to the large surface of the muzzle brick (hole-opening skill level varies from one to nine degrees).

(3) Contrast with opening oxygen holes in an emergency, it is difficult to do so, and a large working space is a relief.

There are problems with temples, and an effective way to solve them would be to mechanize the current drilling work.

1-1 Mechanization" 2. One possible problem is how to replace the judgment and operation of oxygen pumping performed by operator A with a machine. This judgment and operation requires a high degree of skill on the part of the operator, and relies heavily on intuition. In addition, the conditions inside the taphole vary, and the combustion and melting rates of the metal rods are not constant, making it impossible to set an appropriate lance feed rate.
It was considered extremely difficult to send the lance mechanically.

Even if the lance is simply fed mechanically, the lance collides with the metal rod and causes buckling if the feed is slower than the combustion/melting rate of %1m, and conversely, if the lance is fed too slowly, the burning/melting of the metal rod becomes slower. This increases the loss of the lance, making it impossible to perform efficient hole-drilling work.

Purpose of the Invention The purpose of the present invention is to solve the above-mentioned problems and realize a chest mounting that relieves people from high-temperature, dangerous work and enables safe and efficient oxygen hole drilling work. As a result of conducting experiments and various studies regarding the method of sending the lance, it was found that there is no known material available.

Structure of the Present Invention The present inventors have attempted to mechanize the oxygen drilling work of the iron tap hole in the madder furnace.The problem is the feed rate of the oxygen lance, but the problem is that the oxygen lance is not broken in the tap hole. It has been found that if the II cumulative lance is fed at a speed equal to -42, which is calculated by adding the dissolution rate of the lance itself to the combustion and dissolution rate of the pot rod, the desired efficient opening can be obtained. As a result of various trials and errors as to how to achieve this speed, we found that when pressing the oxygen lance against the taphole and blowing oxygen, the oxygen lance was not buckled by the driving source of the oxygen lance. The lance was configured so that a load defined as 1*total upper limit was applied in advance, and the lance automatically stopped when the load was within the set range, and automatically started moving when the load was released. With this configuration, the hole-opening work using the oxygen lance can be easily mechanized.

Although the drive source for performing the above operations is not particularly limited, the following may be employed as appropriate.

Hydraulic type ■ Method using a variable displacement piston; adopts a pump with a cut-off characteristic in which the discharge amount approaches 0 when the shaft input (load) increases and reaches the set pressure (see Figure 7 (al)). IJ IJ-Method using a valve; The relief valve operates at the set pressure and the entire amount of hydraulic oil returns to the tank. (See Figure 7 (G))) Electric method ■ Method using a torque motor: Setting The motor stops when the torque is applied, and starts when the torque is released.

■ Method using an electric torque limiter: Detects the set torque and uses that signal to turn off the power and stop the motor. The power is turned on at the time set by the timer, and at that time, if the torque is less than the installed torque, the motor starts.
! I! Interest rate required.

Method using a mechanical (q) torque limiter: Uses the principle that when a set load is applied, slip occurs, and when the load is removed, TL automatically returns.

Example Next, the method of the present invention will be explained according to examples.

In Fig. 5, 12 is an air starter, 13 is a roller chain, J4 is a running trolley, 2 is an oxygen lance, lla
1 indicates a metal rod, and 1 indicates a tap hole. The oxygen lance 2 is sent to the tap 1]1 by running a traveling truck 14 via a roller chain]3 by rotational driving of an air motor 12. Here, the air motor 12i used is an air motor that automatically increases or decreases the rotation speed from 1 to 1 depending on the load, and stops at the rated load, but returns to the original rotation speed when the load is removed. ]-2.

To explain the feed of the lance 2 using a specific example, the feed speed of the lance 2 is determined by adding the melting rate of the lance 2 to the combustion and dissolution rate of the metal rod, based on the experimental data shown in Figure 4. The added speed is within 3m7m#r, and we will send lance 2 at a speed of 5m/min. Also, as mentioned above, the set value of the load that stops the lance feed is set to the maximum level that will not cause the lance to buckle.
This varies depending on the diameter and thickness of the lance, but it is usually 200.
It is around 9 kg, and in the example, it is 150 kg. (Other numerical values are also examples, and should be changed according to various conditions in the taphole, oxygen amount, etc.) Next, a series of operations will be explained in the fifth example. FIG. 5(a) shows a state in which the lance 2 supplying oxygen is being fed into the tap hole l at a speed of 5 m/m or more by the operation of the air motor 12. Figure 5 (b) shows how the fleas rod reacts with oxygen 3 and burns and dissolves as the lance 2 approaches the metal rod.

Figure 5 (c) shows that the feed speed of lance 2 is faster than the combustion/dissolution rate of the metal rod, la, and the erosion rate of lance 2 itself, so lance 2 collides with the metal rod 11a, setting the load. shows the state in which the lance is stopped by acting on the lance.

In Fig. 5), while the lance 2 is stopped, the metal rod 11a is
is burned and melted, a clearance is created between the metal rod 11a and the lance 2, and the lance starts up again, resulting in the state shown in FIG. 5(b). By repeating this series of operations, it is possible to perform the oxygen hole opening work continuously by machine.

Another embodiment is shown in FIG. This device consists of an air motor 12. Drive roller 15. 6, and an air motor 1 as in the embodiment shown in FIG.
2 is used. Operate the air motor 12 times,
The rotation sound is transmitted to the drive roller 15 and the presser roller 1
The lance 2 is fed out by suppressing the slippage of the lance 2 at 6, and has the feature that a stopping load can be set at the same time as the feeding speed of the lance 2.

Effects of the present invention 81 According to the lance feeding method of the present invention, mechanization of oxygen hole drilling work can be easily realized, freeing people from high heat and heavy muscle work,
It has the advantage of being able to perform stable and efficient hole drilling work in one tool.

[Brief explanation of drawings]

FIG. 1 is a working diagram showing a conventional oxygen hole opening method. FIG. 2 is a diagram showing the state of oxygen pores inside the taphole. FIG. 3 is a front view showing an embodiment of an apparatus using the present invention. Figure 4 shows the experimental combustion and dissolution rate of the metal rod and the rate of erosion of the lance itself. Figure 5 (a) (mouth 1 (1)
((b) is a diagram showing a series of lance feeding operations in the iron outlet. Figure 6 is a front view showing other embodiments as a device using the present invention. It is an explanatory diagram of an embodiment of a drive source adopted in the invention. 1... Iron outlet 2... Strict cumulative lance 3... Oxygen 4...・・Oxygen valve 5・・・Oxygen hose 6・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・· ... Replenishment lance] O... Drill hole... Metal rod 1, 1 a... Metal rod 12 of the taphole... Air motor]': S... ・・Roller chain] 4...
・ ・Traveling trolley】b・・・・・・Drive roller】6・ ・ ・・・・・Press roller Applicant: Nippon Steel Corporation-”-”-] ηN Treasure 1/Hoyogusa 5 Figure 6 (a') (t),)

Claims (1)

[Claims] In the method of opening the blast furnace taphole using oxygen VC, the oxygen lance is pressed against all the tapholes and when opening the hole by blowing oxygen, the oxygen lance is seated in advance in the drive source that moves the oxygen lance back and forth. The load tray is set so that the level at which it does not succumb is set to -1-, and the oxygen lance stops within the set range, and when the load is released, the lance moves again. This method uses an oxygen lance to open a hole at the furnace outlet.