JP2706732B2 - Probe for sampling and / or temperature measurement of molten metal - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a probe for immersing in a molten metal to collect a sample of the molten metal and / or to measure a temperature or the like.

[Conventional technology]

A sublance system is known as a method for measuring the temperature and the like of a molten metal bath such as a steel bath or the like during blowing. That is, as shown in FIG. 8, a converter 2 containing a molten metal bath 1
In response to this, the ordinary oxygen lance 3 is lowered to blow the molten metal into the molten metal bath, and the other lance (sub lance) 4 is lowered to blow the probe 5 attached to the lower end of the sub lance 4. The probe 5 is immersed in the bath 1 during the smelting, and the probe 5 measures the temperature and the like and collects a sample.

As shown in FIGS. 9 to 11, the sublance 4 is
A projection 6 is provided at the lower end, and a shoulder 7 having a large diameter is provided above the projection 6. The probe 5 is provided with a sample collection and / or measurement unit 9 also formed of a paper tube or the like at the lower end of a tube unit 8 formed of a paper tube or the like, in which a temperature measurement sensor, an oxygen sensor, and a sample collection container are provided. Etc. are provided. At the upper end of the tube portion 8, a connecting tube 10 formed by a paper tube or the like is provided. The operation of attaching the probe 5 to the lower end of the sublance 4 is performed mechanically. That is, with the probe 5 fixed, the sub-lance 4 is lowered from above the probe, and the protrusion 6 is press-fitted into the connecting cylinder 10 and fitted. When the protrusion 6 is inserted into the connection tube 10, it is connected to a connector (not shown) in the probe 5, and forms an electrical connection by a plug and a socket.

[Problems to be solved by the invention]

When the probe 5 is inserted into the converter 2 by the sub-lance 4, fine molten metal fine particles are in a floating (spitting) state in the converter 2. Adheres to In addition, converter 2
The inside is filled with a high-temperature atmosphere gas. Therefore, the outer peripheral surface of the connecting tube 10 of the probe 5 is burned by the molten metal fine particles 12 and the high-temperature atmosphere gas. As a result of this combustion,
The upper edge of 10 also burns, creating a gap 13 with the shoulder 7 of the sub-lance 4 (FIG. 9). (A gap 13 may already be formed when the probe is mounted on the sub-lance due to mechanical deformation due to abrasion of the shoulder portion of the sub-lance or bending of the projection 6.) Next, the probe 5 is lowered by lowering the sub-lance 4.
When the sample collection and / or measurement unit 9 is immersed in the molten metal 1, the molten metal 1 is splashed and the scattered molten metal adheres to the outer peripheral surfaces of the sublance 4 and the probe 5. In addition, since the molten metal 1 during blowing is in a scattered (slopping) state in the furnace, the molten metal that jumps adheres to the outer peripheral surfaces of the sublance 4 and the probe 5. As a result, the combustion of the connecting cylinder 10 described above is promoted, and the gap 13 is enlarged.

After the sampling and / or the measurement of the temperature, etc. are completed, the sub-lance 4 is raised and the probe 5 is lifted from the converter 2. When the molten metal attached to the outer peripheral surface of the sub-lance 4 hangs down and moves to the probe 5 side. , Penetrate into the gap 13. The molten metal expands the gap 13 when it infiltrates, and then cools and solidifies to form the metal 14 (Fig. 10). This bullion 14
Is formed into a solid metal part 14a that covers the shoulder 7 of the sublance 4 as a result of filling the gap 13.

After the sub-lance 4 is lifted from the converter 2, the probe 5 is removed, another new probe is attached, and the converter 2 is re-mounted.
The above operation is repeated. By the way, when removing the probe, when the connecting tube 10 of the probe 5 is pulled out from the projection 6 of the sub-lance 4, the above-mentioned massive metal part 14a is attached so as to envelop the shoulder 7 of the sub-lance. From the solid metal 14b solidified on the connecting tube 10
Side (Fig. 11).

If such solid metal 14a is allowed to adhere to the sub-lance shoulder 7, the solid metal 14a will gradually grow and become large lumps every time sampling and / or temperature measurement is repeated. At last, it becomes impossible to attach a new probe to the sublance. That is,
This makes it impossible to electrically connect the projection 6 to a connector (not shown).

[Means for solving the problem]

As a technique for preventing the adhesion of the metal at the connection between the sublance and the probe, the present applicant has already disclosed a technique disclosed in Japanese Utility Model Application Laid-Open No.
No. proposed. According to this, since the connecting tube of the probe generates gas at high temperature and is formed of a material remaining as a carbide after the gas is generated, the molten metal fine particles in the spitting state described above are formed on the outer periphery of the connecting tube. It could be expected to have the effect of bouncing off, and it was confirmed that it contributed to prevention of adhesion of molten metal. However, the burned material remaining as carbide after the generation of gas has weak mechanical strength, so the sub-lance may vibrate due to the collision of molten metal by splashing or dropping, Vibrates under the strong flow of oxygen and oxygen reactant gas,
Further, when the probe itself oscillates due to the violent movement of the molten metal during blowing, the burned material partially collapses, and sometimes an undesired gap between the connecting cylinder and the sub-lance shoulder as described above. Was formed.

On the other hand, an arrangement in which an elastic ring seal is interposed at a connection portion between a sub lance and a probe is known as Japanese Patent Application Laid-Open No. 60-203856. However, such elastic ring seals
The above-mentioned problems cannot be solved after all because the combustion due to the high temperature results in the formation of the above-mentioned undesirable gap between the connecting cylinder and the shoulder portion of the sub-lance.

The present invention solves the above-mentioned problems and provides a method for sampling a molten material and / or
Or, a probe for measuring temperature is provided, and the probe is configured to take a sample of molten metal and / or measure temperature by being attached to the lower end of the sub-lance. In the case where a connecting cylinder having an upper annular edge facing the shoulder portion of the sub-lance above the projection is provided above the probe in a state where the projection is fitted: a protective cylinder portion forming at least the outer peripheral surface of the connecting cylinder is provided. Forming a gas generating means in the protective cylinder by using the coating material as a material that generates gas at high temperature; forming by the upper end of the composite material A seal means is provided on the upper annular edge so that the core material is crushed by the pressing force of the shoulder portion of the sub-lance so as to be brought into close contact with the shoulder portion of the sub-lance.

〔Example〕

 Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.

In the present invention, the probe 5 is provided at the lower end of a tube portion 16 formed of a paper tube or the like, similarly to the conventional example shown in FIG.
Similarly, a sampling and / or measuring unit (not shown) formed by a paper tube or the like is provided, while a connecting tube 17 is provided at the upper end of the tube unit 16. A temperature measuring sensor, an oxygen sensor, a sampling container, and the like are provided in the sampling and / or measurement section. A connector (not shown) is arranged in the tube portion 16.

The sub-lance 4 includes the protrusion 6 and the shoulder 7 as described above. With the probe 5 fixed, the sub-lance 4 is lowered from above the probe 5 and the projection 6 is connected to the connecting cylinder 17.
The probe 5 is pressed into the sub-lance 4
Mechanically. The protrusion 6 is connected to a connector (not shown) and is electrically connected.

In the present invention, at least the outer peripheral surface of the connection cylinder 17 is formed by a protection cylinder 17c, and the protection cylinder 17c is formed to include a composite body 61 in which a coating material is coated on a metal core material. The coating material is a material that generates gas at high temperature,
Thereby, the gas generating means 19 is provided in the protection cylinder 17c. The upper edge of the composite is provided with a sealing means 40 which is crushed by receiving the pressing force of the sub-lance shoulder 7 and is brought into close contact with the sub-lance shoulder 7 (FIG. 1).

In the illustrated embodiment, the connecting cylinder 17 is an inner cylinder made of a paper tube.
The outer tube 17a is inserted into and fixed to the tube portion 16, and the outer tube 17b made of a paper tube is inserted and fixed to the lower half of the inner tube 17a, and the above-mentioned composite is formed in the upper half of the inner tube 17a. The protection cylinder 17c is extrapolated and fixed.

As a material for generating the gas at a high temperature for constituting the gas generating means 19, for example, a synthetic rubber material such as chloroprene rubber or a high-molecular synthetic resin material such as a phenol resin or a urea resin can be used. .

The metal core of the composite 61 can be arbitrarily selected from a variety of plastically deformable metal materials, but is most preferably the same material as the molten metal to be measured. For example, it is preferable to use SS material for molten metal of pig or steel, and to use SUS material for molten metal of SUS.

FIGS. 6 and 7 show an embodiment for forming the protection cylinder 17c.
It is shown in the figure.

In FIG. 6, the protection cylinder 17c is composed of a sheet 60 made of a material that generates gas at high temperature, and a composite 61 that is polymerized and fixed to the outside of the sheet 60. The complex 61
Is composed of a metal core 62 made of a metal net formed by weaving a wire, and a coating material 63 made of a high-temperature gas-generating material applied to cover the metal net. Such a composite 61 can be easily manufactured by immersing a metal net in a molten bath of the above-described high-temperature gas generating material and attaching the material to the surface of the net. Thus, the protection cylinder 17c is
The covering member 63 and the sheet 60 facing the mesh of the composite 61 constitute the gas generating means 19 on the outer peripheral surface. Further, the composite body 61 composed of the core material 62 and the covering material 63 is freely deformed by being crushed as a whole. Therefore, in this embodiment, by arranging at least the upper annular edge of the composite projecting beyond the upper ends of the sheet 60 and the inner cylinder 17a, the projecting edge can be easily crushed by an external force. Is configured.

In FIG. 7, a protective cylinder 17c is provided with a sheet-like composite 61
Are polymerized and fixed. This composite 61 is made of a metal plate made of a core material 64.
The core material 64 is formed by coating the core material 64 with the coating material 65 made of the above-mentioned high temperature gas generating material, and a large number of punch holes 66 are opened. Thus, the protective cylinder 17c forms the gas generating means 19 on the outer peripheral surface by the covering material 65 and the sheet 60 facing the punched hole 66. Further, the composite body 61 composed of the core material 64 and the covering material 65 can be easily crushed as a whole by an external force.
The upper annular edge of the composite is arranged so as to protrude from the upper end of the sheet 60 and the inner cylinder 17a, and the protruding edge causes the sealing means 40 to be closed.
Is configured.

6 and 7, a plurality of the composites 61 are laminated on the inner and outer peripheries to form a thick laminate, and such a laminate is used instead of the sheet 60. May be arranged.

Incidentally, the sealing means 40 of the present invention is, as described above,
The peripheral portion of the composite body 61 is crushed by the pressing force of the sub-lance shoulder portion 7 so that the composite body 61 is brought into close contact with the sub-lance shoulder portion 7 so as to prevent the intrusion of the molten metal to some extent. It does not require close contact. Therefore, it should be understood that the term “seal” in the present specification should not be interpreted as a strict seal, but should be interpreted in a broad sense including a case where a part has a minute gap.

[Action]

When attaching the probe 5 to the sub-lance 4, the probe 5 is fixed, the sub-lance 4 is lowered from above the probe 5, and the protrusion 6 is press-fitted to the connecting cylinder 17 to perform mechanical attachment. . Since the downward pressing force of the sub lance 4 is large, the sealing means for the connecting cylinder 17 is required.
40 is crushed by the sub-lance shoulder 7. At the time of the deformation due to the crushing, the sealing means 40 is adapted to the surface of the sub-lance shoulder portion 7 due to the plastic deformation of the metal core material and is brought into close contact therewith (the second).
Figure). For this reason, even if the sub-lance shoulder 7 is irregularly deformed due to wear, there is no gap between the shoulder 7 and the connecting cylinder 17.

When the probe 5 is inserted into the converter 2 by the sub-lance 4, gas is generated from the gas generating means 19 of the connecting cylinder 17. That is, in the case of the synthetic rubber such as the above-described chloroprene rubber or the like, or a high-molecular synthetic resin such as a phenol resin, a gas is generated by burning, and remains as a carbide after the gas is generated. Due to this gas generation, the fine molten metal particles M1 floating (spitting) in the converter 2 are repelled from the outer periphery of the connecting cylinder 17 (FIG. 3). Therefore, the molten metal fine particles M1
Adhering to 17 is prevented.

Next, when the sub-lance 4 is lowered to immerse the sample and / or the measurement part of the probe 5 in the molten metal, the molten metal is splashed and the scattered molten metal adheres to the outer peripheral surfaces of the sub-lance 4 and the probe 5. . Further, since the molten metal during blowing is in a slopping state in the furnace, the molten metal that jumps and adheres to the outer peripheral surfaces of the sublance 4 and the probe 5. However, during this time,
Since the gas generating means 19 of 17 continuously generates gas, even if the molten metal once adheres to the connecting cylinder 17, it is immediately blown off by the gas and dropped.

When the sub-lance 4 is raised after the sample collection and / or the measurement of the temperature and the like are completed, and the probe 5 is pulled up from the converter 2, the molten metal attached to the outer peripheral surface of the sub-lance 4 hangs down and moves to the probe 5 side. . At this time, no gap is formed between the sub-lance shoulder 7 and the connecting cylinder 17 as in the related art, and the sealing means 40 formed by crushing the composite 61 together with the metal core material is filled. I have.
Therefore, the hanging molten metal moves smoothly below the probe 5 (FIG. 4).

When removing the probe 5 from the sublance 4 and replacing it with another new probe, the protrusion 6
When the connecting tube 17 of the probe 5 is pulled out from the
The solid metal 15 solidified on the outer periphery of the lance adheres to the connecting cylinder 17 and is peeled off from the shoulder portion 7 of the sub-lance. Therefore, there is no remaining metal in the sub-lance shoulder 7 as in the conventional case (No. 5).
Figure).

If the protective cylinder 17c is configured as shown in FIGS. 6 and 7, the molten metal that hangs down from the outer periphery of the sub-lance 4 to the outer peripheral surface of the protective cylinder 17c is firmly fixed to the protective cylinder 17c. Good results can be obtained. For example, in the embodiment shown in FIG. 6, the coating material 63 of the net-like composite 61 constituting the protection cylinder 17c remains as a carbide after generating and burning gas, but the sublance is melted by splash or dropping. It vibrates in response to metal impact, or vibrates due to the intense flow of oxygen and oxygen reactant gas in the converter during blowing, and the probe itself fluctuates due to violent movement of the molten metal during blowing. When moved, the residual carbides partially collapse and may expose the metal core 62. In this case, the hanging molten metal is adhered to the core 62 and entangled with the net to be solidified to form a lump. The bullion 15 is formed. In the embodiment shown in FIG.
The molten metal that hangs down from the punched hole 66
And cling to the metal core 64 exposed from the collapsed portion of the carbide after gas generation to form the bulk metal 15. Therefore, as described above, when the probe is withdrawn from the sublance,
The bulk metal 15 follows the probe and is suitably peeled from the sublance shoulder 7.

[Effects of the Invention] The present invention has the following effects as a result of the configuration described above.

(1) Since gas is generated from the outer peripheral surface of the connecting cylinder 17 by the gas generating means 19, it is possible to prevent molten metal from adhering to the connecting cylinder 17.

(2) Since the sealing means 40 is provided between the connecting cylinder 17 and the sub-lance shoulder portion 7 by crushing the composite material together with the metal core material so as to bring the composite material into close contact with each other. Metal can reliably be prevented from penetrating into the space between the sub-lance shoulder 7 and the connecting cylinder 17.

(3) For this reason, when pulling out the probe from the sub-lance, the solid metal 15 solidified on the connecting tube 17 is peeled off from the shoulder of the sub-lance following the probe side,
It does not adhere to the shoulder portion of the sub-lance unlike the related art.

(4) In particular, by forming the protection cylinder 17c constituting at least the outer peripheral surface of the connecting cylinder 17 by a composite body in which a coating material is coated on a metal core material, sealing means is provided through plastic deformation of the metal core material. In addition to being able to easily construct the protective cylinder 17c, the gas generating means can be composed of the covering material as it is, so that the protective cylinder 17c can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of one embodiment of the present invention, and FIG.
Fig. 3 is a longitudinal sectional view showing a state in which the probe is mechanically attached to the sub-lance. Fig. 3 is a longitudinal sectional view showing a state in which the molten metal is received in the converter. FIG. 5 is a longitudinal sectional view showing a state in which the probe has been pulled down from a sublance, and FIG. 6 is a cutaway perspective view showing a first embodiment of a protective cylinder constituting a connecting cylinder. FIG. 7 is a cutaway perspective view showing the second embodiment, FIG. 8 is a longitudinal sectional view showing a converter with an oxygen lance and a sub lance inserted, and FIG. 9 is a state in which a conventional probe is attached to a sub lance. Fig. 10 is a front elevational view, partially in section, of a state in which molten metal in a converter is received in the converter. The figure shows a probe with a sub-run FIG. 4 is a vertical cross-sectional view showing a state where it is pulled out from a wire. 1 ... Molten metal, 2 ... Converter, 3 ... Oxygen lance, 4 ... Sub lance, 5 ... Probe, 6 ... Protrusion, 7 ... Shoulder, 13 ...
Crevice, 15… Lumped metal, 16 …… Tube, 17 …… Connection tube, 17a…
... Inner cylinder, 17b ... Outer cylinder, 17c ... Protection cylinder, 19 ... Gas generating means, 40 ... Sealing means, 61 ... Composite, 62, 64 ... Metal core material, 63, 65 ... Coating Wood.

Claims (1)

(57) [Claims] A probe for taking a sample of a molten metal and / or measuring a temperature by being attached to a lower end of a sub-lance, wherein a sub-lance shoulder portion above the lower end of the sub-lance is inserted and fitted. In a configuration in which a connection tube having an upper annular edge facing the upper surface of the connection tube is provided above the probe:
Formed by a composite in which a coating material is coated on a metal core;
A gas generating means is formed in the protective cylinder by using the coating material as a material which generates gas at high temperature; a core material is formed on the upper annular edge formed by the upper end of the composite by a pressing force of a sub-lance shoulder. A probe for sampling a molten metal and / or measuring a temperature, comprising sealing means for crushing and bringing the sublance into close contact with the shoulder.