JPS5935570Y2 - Probe for measuring the bottom thickness of metallurgical furnaces such as converters - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a probe for measuring the bottom thickness of a metallurgical furnace such as a converter lined with a refractory.

In metallurgical furnaces such as converters that are lined with refractories, the refractory layer 3 that is lined with refractories increases with repeated use, as shown in Figure 1.
The thickness becomes uneven due to erosion, repair, etc.

Understanding the thickness of the refractory layer 3, especially the bottom refractory layer 3', is important for the maintenance and management of the metallurgical furnace 1, such as a converter, and for determining the blowing conditions corresponding to the internal capacity of the furnace.

Conventionally, as a method for measuring the thickness of the refractory layer at the bottom of a furnace, a worker hangs a metal wire with a weight attached to one end into the furnace and detects the position of the bottom surface by the length of the metal wire. Methods have been used to measure the thickness of refractory layers.

However, this method has problems such as being dangerous and requiring a long time for measurement.

To solve this problem, a cylindrical measurement probe with a contact-sensing electrode attached to the tip is attached to the sublance, the sublance is lowered, and the position of the furnace bottom is detected by the electric signal when the electrode comes into contact with the furnace bottom. An automatic measurement method has been developed to measure the thickness of the refractory layer at the bottom of the furnace.

As a measurement probe used in this method,
No. 0350, Utility Model Application Publication No. 54-3168, etc. are publicly known.

However, these measurement probes did not satisfy the following conflicting needs as a furnace bottom thickness measurement probe.

That is, lowering the sub-lance deeply into the melt must be avoided since the sub-lance will be exposed to high temperatures, and for this purpose it is desirable that the measurement probe be as long as possible.

However, in order to automatically attach the probe to the sublance, the length must be the standard dimension for a measurement probe used in other sublances.

The purpose of the present invention is to provide a probe for measuring the bottom thickness of a metallurgical furnace such as a converter, which solves the above-mentioned conventional problems.The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 shows the furnace bottom thickness measuring probe of the present invention, and the measuring probe 10 is provided at the upper end with a sub-lance (not shown).
The sublance guide paper tube 11 is a cylindrical body that guides the insertion of the
, a connecting paper tube 12 which is a cylindrical body fixed to the lower inner surface of the guide paper tube 11, and a cable storage paper tube 13 which is a cylindrical body fixed to the lower outer surface of the connecting paper tube 12.
', the main body 10' has a long sublance guide paper tube 1.
The length from the upper end surface of the cable storage paper tube 13 to the lower end surface of the cable storage paper tube 13 is set as a reference dimension (a reference dimension that enables automatic installation) as a measurement probe used in a sub-lance.

A connector 15 for electrically connecting the measuring probe 10 to the sub-lance is provided at the lower inside of the connecting paper tube 12 and projects upward.

Further, below the connector 15 inside the connecting paper tube 12, a detection body hanging cable 18 is fixed at an upper connecting end 19 by a fixing member 16.

The detection body suspension cable 18 is attached to the cable storage paper tube 13.
The inside is wrapped in a coil and hangs down.

The cable 18 is fixed at its lower connecting end 20 to a hearth bottom sensor 23, which will be described next.

The cable 18 is composed of a pair of conductive wires and a coating integrally covering the conductive wires, and the conductive wires electrically connect the hearth bottom detector 23 to the connector 15.

FIG. 3 shows details of the hearth bottom detector 23 shown in FIG. 2,
The sensing body 23 has an upper paper tube 24 secured to the sensing body hanging cable 18 at its lower connecting end 20 by a fixing member 27.

An upper bottom tube 24' is fixed to the lower inner surface of the upper paper tube 24, and the upper bottom tube 24' supports the switch 29 adiabatically on the inner surface.

Further, a lower paper tube 25 is fixed to the lower outer surface of the upper paper tube 24, and the lower paper tube 25 has the upper bottom tube 24 inside.
A detection rod storage chamber 30 is formed between the lower bottom tube 25 and the lower bottom tube 25 fixed to the inner surface of the lower portion.

A button 31 provided at the lower end of the switch 29 projects into a detection rod storage chamber 30 that is insulated by the lower paper tube 25.

In addition, the switch 29 is connected to the conductor 2 of the detection body suspension cable 18.
8.28' are connected, and pressing the button 31 electrically connects these conductors 28.28'.

The lower bottom tube 25' slidably accommodates a detection rod 33 therein, and the upper end of the detection rod 33 protrudes into the detection rod storage chamber 30 and faces the button 31 at a predetermined distance.

The upper end of the detection rod 33 has a detection rod head 33' with an enlarged diameter.
Configure.

Further, a cylindrical weight 26 made of metal is fixed to the outer surface of the lower paper tube 25.

Returning to FIG. 2, as described above, the hearth bottom detector 23 is loosely housed in the lower part of the inside of the cable housing paper tube 13.

This hearth bottom detector 23 is supported within the cable housing paper tube 13 by a detector support lid 21 adhered to the outer surface of the lower end of the cable housing paper tube 13.

The shape of the detector support lid 21 is as shown in FIG. 4.1, and is made of a material that is destroyed by heat in the metallurgical furnace 1 such as a converter.

The method of use and operation of the furnace bottom thickness measuring probe of the present invention having the above configuration will be explained below.

First, the furnace bottom thickness measuring probe 10 is attached to the lower end of the sub-lance 5 by an automatic attachment device in the state shown in FIGS. connected to.

Here, since the length of the measurement probe 10 is set to the standard dimension as a measurement probe used in the sublance 5, it can be easily mounted by an automatic mounting device.

The sub-lance 5 with the measurement probe 10 attached is moved from the upper center of the furnace mouth 4 of the metallurgical furnace 1 such as a converter (if the measurement probe is not installed at the upper center of the furnace mouth 4, the sub-lance 5 is first moved to the upper center of the furnace mouth 4). and then) descend.

As a result, the measurement probe 10 is inserted into the metallurgical furnace 1 such as a converter, and the detector support lid 21 attached to the lower end is destroyed by the heat inside the furnace.

As a result, the furnace bottom detector 2 supported by the support lid 21
3 falls from inside the cable storage paper tube 13 and is suspended below the cable storage paper tube 13 by the detection body suspension cable 18.

Since the bottom detection body 23 has a cylindrical weight 26 made of metal, the cable 18 is in a tensioned state, and the bottom detection body 23 is suspended downward by the length stored in the cable storage paper tube 13. (Figure 6 shows the lowered state)
.

In addition, while the detection rod 33 was supported by the detection body support lid 21, the detection rod 33 was pushed upward and the detection rod head 33' pushed up the button 31 and closed the switch 29.

However, when suspended below the cable storage paper tube 13, the detection rod 33 protrudes from the lower bottom cylinder 25' due to gravity.

As described above, the measurement probe 10 descends in the metallurgical furnace 1 such as a converter with the bottom detection body 23 suspended as the sub-lance 5 descends.

As a result, the detection rod 33 of the furnace bottom detector 23 comes into contact with the surface of the furnace bottom refractory layer 3' and is pushed upward, pushing down the button 31 and closing the switch 29.

As a result, an electrical signal is applied to the measurement circuit via the connector 15 and the sub-lance 5.

At this time, considering the lowered position of the sub-lance 5 and the length of the furnace bottom thickness measuring probe 10 and the detection body hanging cable 18, the position of the surface of the furnace bottom refractory layer 3' can be detected.
The thickness will be measured.

In addition to the embodiments described above, the furnace bottom thickness measuring probe of the present invention may be configured as follows.

First, the detector support lid 21 may be made of any material or have any configuration as long as it can support the furnace bottom detector 23 and is destroyed by the heat inside the metallurgical furnace 1 such as a converter.

Therefore, as shown in FIG. 4.2, a tape 21' may be applied in a cross shape to the outer surface of the lower end of the cable storage paper tube 13.

Also, as shown in Figure 4.3, the plug 22 is inserted into the cable storage paper tube 13.
It may be packed and fixed to the inner surface of the lower end.

Next, in the embodiment described above, when the hearth bottom detection body 23 is housed in the cable storage paper tube 13, the detection rod 3
3 was embedded upward and the switch 29 was closed.

Although this is useful in that it is possible to check the operation of the hearth bottom detector 23, it is not necessary to set it in this way.

That is, when the furnace bottom detector 23 is housed in the cable storage paper tube 13, the detection rod 33 is inserted into the detector support lid 2.
Even if it is configured so that it is not pushed in by the first-class detector support means, there is no problem in measurement.

Next, the detection rod 33 is configured to separate from the button 31 when the hearth detection body 23 is suspended by the detection body suspension cable 18, but this is different from the case where the detection rod 33 is made of metal. This is done in consideration of the risk that heat in the metallurgical furnace 1 such as a converter may be transmitted through the detection rod 33 and heat the button 31 and the switch 29, causing the switch 29 to malfunction.

However, the detection rod 33 and the button 31 may be in contact with each other if the risk of the above-mentioned malfunction can be reduced depending on the material of the detection rod 33, the durability of the switch 29, etc.

The length of the detection body suspension cable 18 may be adjusted so that the detection rod 33 of the furnace bottom detection body 23 comes into contact with the surface of the furnace bottom refractory layer 3' when the sublance 5 is slightly lowered into the furnace ( For example, the length is approximately the same as the length of the furnace bottom thickness measurement probe 10 (1500 mm).

In addition, since the detection body hanging cable 18 receives the heat in the furnace with the hearth bottom detection body 23 hooked down, the material of the coating of the cable 18 must be durable during measurement.

Further, since the cylindrical weight 26 is used as a weight for the hearth bottom detection body 23, its shape and mounting position are arbitrary.

FIGS. 7 and 8 show other bottom sensing bodies of the bottom thickness measuring probe of the present invention, which will be described below in comparison with the one shown in FIG.

This furnace bottom detector 23 includes a conductive metal tube 34 attached to the outer periphery, and a fixing member 3 that fixes the lower connection end 20 of the detector suspension cable 18 filled in the upper part of the metal tube 34.
It has 7.

A screw 40 is fixed laterally to the upper end of the metal tube 34, and the screw 40 is electrically connected to the metal tube 34.

One conductor 28 of the detection body suspension cable 18 is connected to the fixing member 3
7 and is connected to the screw 40 by a bolt 42.42.

The other conductive wire 28' of the detection body suspension cable 18 similarly extends within the fixing member 37 and is connected to the upper end of a metal rod 38, which will be described next.

The upper end of the metal rod 38 is fixed to the fixing member 37 and the metal tube 3
4 and extends downward inside the paper tube 35 housed in the paper tube 35.

A metal plate 39 positioned slightly away from the lower end surface of the metal tube 34 is fixed to the lower end of the metal rod 38 by nuts 42, 42.

That is, the metal rod 38 and the metal cylinder 34 are electrically insulated in a normal state, and can be connected when a force is applied to the metal plate 39 and the metal plate 39 is tilted.

That is, the metal rod 38 and the metal tube 34 together form an electrical connection means for electrically connecting the conducting wire 28, 28' when in contact with the furnace bottom refractory layer 3', and the embodiment shown in FIG. Functionally, it corresponds to the combination of the switch 29 and the detection rod 33 in the example.

The lower connecting end 2° of the cable 18 for hanging the detector is wrapped around the screw 40 and then embedded and fixed in the fixing member 37.

The operation of the bottom sensing body of the bottom thickness measuring probe of the present invention shown in FIGS. 7 and 8 will now be described.

That is, as explained in FIG. 3, when the detector support lid 21 is destroyed by the heat in the furnace, the furnace bottom detector 23 falls from the inside of the cable storage paper tube 13 and is suspended by the detector suspension cable 18. be lowered.

In this state, the furnace bottom detector 23 moves down inside the metallurgical furnace 1 such as a converter, and the metal plate 39 comes into contact with the surface of the furnace bottom refractory layer 3' and tilts to either side.

As a result, the metal plate 39 comes into contact with the metal tube 34 and the two are electrically connected.

That is, the conductor 28 is connected to the screw 40, the metal cylinder 34, and the metal plate 39.
and is electrically connected to the conducting wire 28' via a metal rod 38.

As a result, an electric signal is applied to the measuring circuit via the connector 15 and the sub-lance 5, and the thickness of the furnace bottom refractory layer 3' is measured in the same manner as in FIG.

The furnace bottom thickness measuring probe of this invention has the above configuration and usage method.
It has the following effects in action.

(1) The furnace bottom thickness measurement probe of a metallurgical furnace such as a converter of the present invention has the configuration described in the claims for utility model registration, and in particular, the length of the main body 10' is a standard that allows automatic attachment to the sub-lance 5. Due to its size, automatic attachment to the sub-lance can be easily performed.

(2) The furnace bottom thickness measuring probe for a metallurgical furnace such as a converter according to the present invention has the same configuration as above, and in particular, the furnace bottom detection body 23 having an electrical connection means is suspended by the detection body suspension cable 18 to detect the furnace bottom surface. There is no need to lower the sub-lance 5 deeply into the furnace to detect the position of the sub-lance 5, and as a result, there is no danger of the sub-lance 5 being exposed to high temperatures.

(3) The furnace bottom thickness measuring probe for a metallurgical furnace such as a converter according to the present invention has the same configuration as above, and in particular, it is used to detect the position of the furnace bottom surface by suspending the furnace bottom detection body 23 by the detection body suspension cable 18. The impact when the furnace bottom detector 23 contacts the furnace bottom surface is not transmitted to the measurement probe body 10' and the sublance 5 at all, and as a result, the sublance 5 is not damaged during measurement.

[Brief explanation of the drawings] Fig. 1 is a cross-sectional front view of a metallurgical furnace such as a converter in which the thickness of the refractory layer at the bottom of the furnace is uneven, and Fig. 2 is a cross-sectional front view of a metallurgical furnace such as a converter in which the thickness of the refractory layer at the bottom of the furnace is uneven. Fig. 3 is a partially sectional front view of the above-mentioned furnace bottom detector, Fig. 4.1 to 4.3 are perspective views of the above-mentioned detector support lid, and Fig. 5 is the same as the above sub-lance. FIG. 6 is a front view of the furnace bottom thickness measurement probe in the attached state, and FIG. 8 is a sectional front view of another furnace bottom sensing body of the furnace bottom thickness measuring probe of the present invention, and FIG. 7 is a sectional view taken along the line 8-8 of FIG. 1: Metallurgical furnace such as converter, 2: Furnace main body, 3: Support layer, 3':
Furnace bottom refractory layer, 4: Furnace mouth, 5: Sublance, 10: Furnace bottom thickness measurement probe, 10': Main body, 11: Sublance guide paper tube, 12: Connection paper tube, 13: Cable storage paper tube,
15: Connector, 16: Fixing material, 18: Detector hanging cable, 19: Upper connection end, 20: Lower connection end,
21: Detector support lid, 21': Detector support tape, 22
: Detector support plug, 23: Hearth bottom detector, 24: Upper paper tube,
24': Upper bottom cylinder, 15: Lower paper tube, 25': Lower bottom cylinder, 26: Cylindrical weight, 27: Fixing material, 28: Conductor, 2g conductor, 29: Switch, 30: Detection rod storage chamber, 31 : button, 33: detection rod, 33': detection rod head, 34: metal tube,
35: paper tube, 36: paper tube, 37: fixing material, 38: metal rod, 39: metal plate, 4o: screw, 42: nut

Claims (1)

[Scope of utility model registration request] A main body 10 having standard dimensions that enables automatic attachment to the sub-lance 5, and a connector 15 provided on the main body 10'.
A detection body suspension cable 1 consisting of an electrical connection means to the sub-lance 5, and a pair of conducting wires 28 and 28' of a predetermined length, one end of which is connected to the electrical connection means and covered with a film.
8 and the other end of the conductive wire 28, 28' are connected to each other, and the inside of the main body 10' is provided with electrical connection means for electrically connecting both the conductive wires 28, 28' when in contact with the furnace bottom refractory layer 3'. It consists of a hearth bottom detector 23 housed below and a detector support means such as a detector support lid 21 which is mounted below the main body 10' and supports the hearth bottom detector 23 and is made of a material that is destroyed by the heat in the furnace. A probe for measuring the bottom thickness of metallurgical furnaces such as converters.