JPH0789087B2 - Deposition-proof holder for molten metal thermometer- - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a paper tube forming an outer cylinder when the temperature of molten metal is measured using a probe immersion type thermometer having a thermocouple at the tip. The present invention relates to a molten metal thermometer capable of constantly purging smoke generated when burning out and eliminating erroneous measurement due to adhesion of tar.

To measure the temperature of molten metal, e.g. molten steel in a converter, a thermometer for molten metal consisting of a holder and a probe which is usually equipped with a thermocouple at the tip and consists of a probe paper tube to protect the holder from high temperatures. Is used.

Such a molten metal measurement state and a conventional molten metal thermometer using a holder will be described with reference to the drawings. First
FIG. 10 is an explanatory view showing a molten metal temperature measurement state in a converter, and FIG. 11 (a) is a sectional explanatory view showing an example of a molten metal thermometer using a conventional holder (b). FIG. 4 is a cross-sectional explanatory view showing a cooling state of the holder of the same molten metal thermometer.

As shown in FIG. 10, a molten metal thermometer 1 (hereinafter sometimes referred to as a thermometer) is attached to, for example, the tip of a lance 13 and immersed in the molten metal 15 in the converter furnace body 14. The electromotive force generated by the thermometer 1 is guided by a compensating lead wire 16 to a calculator and a temperature display (not shown) to read the temperature.

The thermometer 1 shown in FIG. 11 (a) comprises a probe 2 and a conventional holder 7'for holding the probe 2. The probe 2 is a portion which is immersed in the molten metal 15 and comes into direct contact with the molten metal 15, and a thermocouple 4 is attached to the tip of the probe paper tube 3 forming the outer cylinder thereof. Compensation lead wire 6 from electrodes 5a, 5b and thermocouple 4
Are electrically connected to the electrodes 5a and 5b by the base 5c.
The side portion is attached inside the probe paper tube 3 in a state of being cut off from the thermocouple 4 side. Further, as shown in FIG. 11 (a), the probe holder 7 ′ holds the probe 2 by externally inserting the probe 2 in which the base portion 5c of the probe connector 5 is located at a predetermined position of the tip of the probe paper tube 3. The main body is a cylindrical body 8 and a holder connector 9 is provided in the peripheral wall of the tip of the cylindrical body 8. The holder connector 9 is mounted on the cylindrical body 8 as described above.
Electrode of the probe connector 5 when the
It has electrodes 9a and 9b which are in contact with 5a and 5b, respectively, and these electrodes 9a and 9b are connected by a compensating lead wire 10 to an external device such as a calculator or a temperature display. It goes without saying that the electrodes 5a and 5b of the probe connector 5 and the electrodes 9a and 9b of the holder connector 9 are insulated from each other. A vent hole 9c is provided on the base portion 8a side of the cylindrical body 8 of the holder connector 9. The holder connector 9 is easily attached to and detached from the tip peripheral wall of the tubular body 8 by means such as screwing (not shown). In addition, the cylindrical body 8 from the base 8a to the tip of the cylindrical body 8
An inner ventilation passage 8b is provided inside the inner portion of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the base portion 8a.

While the probe 2 is externally inserted into the holder 7 ', the thermometer 1 is constructed as shown in FIG. 11 (a), and while being immersed in the hot molten metal 15 as shown in FIG. 10, the temperature is measured. The probe paper tube 3 is burned (smoke is generated at that time), and the holder 7'is also affected by the high temperature due to the heat of the probe paper tube 3 being burned. Therefore, when the predetermined temperature measurement is completed, the tip of the probe paper tube 3 is burned out.
, The probe 2 is pulled out and discarded, and the cooling gas (usually air, but N ₂ gas or the like is also used in the inside of the cylindrical body 8 of the holder 7 ′ from the base 8 a side as shown in FIG. 11B). ) In the direction of the arrow and the holder connector 9
The smoke is exhausted to the outside through the vent hole 9c of the holder 7'to purge the smoke in the holder 7 ', and at the same time, the compensating lead wire 10 and the electrodes 9a, 9b of the holder connector 9 are cooled (in general, the holder is purged with a cooling gas as described above). Is called a gas purge type holder). In the purging operation described above, the cooling gas is practically always pressurized on the side of the base portion 8a of the cylindrical body 8, but the cooling gas does not flow because the inside of the thermometer 1 is closed.
At the same time when the probe 2 is pulled out from the holder 7 ', the cooling gas automatically purges the inside of the cylindrical body 8. A new probe paper tube 3 and a new probe 2 are externally inserted into the cooled holder 7'to form the thermometer 1. In this way, the holder 7'is repeatedly used.

However, when the temperature of the molten metal 15 was measured by the thermometer 1 constructed by using the above-mentioned conventional holder 7 ', there was no problem in the measured values of the holder 7'from new to the initial 2-3 times. After that, the temperature measurement sometimes became abnormal. According to the investigation by the present inventors, out of all the frequency occurrences of the temperature measurement value occurring in 6 months, the number of times caused by the holder 7'not being a new product. Reached about 80%. The generation of such an abnormal temperature measurement value causes unnecessary consumption and time loss of the probe 2 including the probe paper tube 3 and the thermocouple 4 due to re-measurement of temperature, or mixing of an abnormal temperature measurement value. This caused a loss of process time and a loss of materials such as oxygen due to the lack of awareness.

The conventional holder 7'has the drawbacks described above.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a holder which does not have the above-mentioned drawbacks of the prior art and is not only a new holder but does not cause an abnormal measurement value of a thermometer for a long time.

In order to achieve this purpose, the present inventors have used the conventional holder 7 '.
The following results were obtained by examining the cause of the abnormal measurement value when using.

As described above, smoke is generated when the probe paper tube 3 is burnt out during the temperature measurement of the molten metal 15. However, in the thermometer 1 in which the conventional holder 7'is used, as shown in FIG. 11 (a), the gear gap between the holder 7'and the probe paper tube 3 of the probe 2 is very small, and smoke passes through this gear gap. Not only is it difficult, but the structure is such that smoke is emitted to the outside at the end of the gear. Accordingly, the generated smoke fills and stagnates in the above-mentioned gear, and the tar 11 contained in the smoke becomes tar-like, and the probe connector 5 on the probe 2 side, the surface of the probe paper tube 3 and the holder connector 9 on the holder 7'side. Further, it also penetrates into the inside of the cylindrical body 8 and adheres to the compensating lead wire or the connecting portion (the adhered crocodile 11 is shown only to the holder connector 9 in FIG. 11B). The probe 2 is used as a disposable one each time the thermometer 1 is pulled out of the molten metal 15, but the holder 7'is cleaned for repeated use. And holder connector 9
In order to facilitate the cleaning work, the structure is such that it can be easily attached to and detached from the tubular body 8. The above is what was conventionally implemented.

However, as a result of a detailed study by the inventors of the present invention on the crocodile 11, the crocodile 11 is soft at the beginning of adhesion but becomes hard after a few hours and becomes difficult to remove, and it is not sufficiently removed by a single cleaning operation, This adheres and accumulates on the surface of the holder connector 9. And this tightly connected crocodile 11
Indicates the degree of insulation between the electrodes 9a and 9b of the holder connector 9 (about 10 MΩ for new products), for example, 500 to 700 KΩ after 20 times of use and 60 KΩ after 100 times of use under the condition of not cleaning after use.
Temperature, and not only this decrease in insulation directly adversely affects the indicated temperature, but it also makes it difficult to detect faulty electrical conduction in other parts, disconnection of the thermocouple 4, etc. It was found to be the cause of the abnormal measurement value of. Further, it has been found that the adhesion of the varnish 11 to the wiring and connection inside the cylindrical body 8 which cannot be further cleaned causes various failures. The influence of such adhesion of the tar 11 has never been recognized.

Therefore, the holder 7'with no resin 11 attached
Various attempts have been made to use For example, the method of frequently pulling up the tar 11 from the molten metal 15 of the thermometer 1 and wiping the tar 11 of the holder 7 ′ before the tar 11 adhered to the used holder 7 ′ or the like is hardened in 1 hour in 2 hours in the actual site. The number of times is the limit that can be implemented.
Could not be removed sufficiently. In addition, when I tried to remove the hardened tar 11 with alcohol, it was possible but not practical because it took too much time.

As described above, there is a problem that it is very difficult to solve how to obtain the holder 7'used for the construction of the thermometer 1 in the state where the tar 11 is not attached.

[Means for solving problems]

As a result of various studies by the present inventors, an outer ventilation passage is formed between the probe paper tube of the probe and the cylindrical body of the holder so as to communicate with the inner ventilation passage, and the cooling gas is constantly generated through this ventilation passage. The present invention was accomplished by discovering that the above problems can be solved by configuring a holder so that smoke can be constantly purged outside the thermometer without stagnation of smoke and measuring the temperature.

That is, according to the present invention, the probe connector electrically connected to the thermocouple attached to the tip of the probe paper tube immersed in the molten metal through the compensating lead wire has the base portion of the probe connector and the electrodes of the probe connector. A holder for holding a probe that is mounted in the probe paper tube in a state where the ventilation with the side is blocked, and is mainly a cylindrical body that is externally inserted until the base portion of the probe connector almost abuts its tip. A holder connector that is electrically connected to the probe connector in the above-mentioned extrapolated state and electrically energizes to the outside is provided in the peripheral wall of the distal end of the cylindrical body, and the inside of the cylindrical body from the base portion to the tip of the cylindrical body is externally provided at the base portion. A holder provided with an inner air passage communicating with the inside of the tube from the base side to the tip of the tube body when the probe paper tube is externally inserted. Even in a state where the cylindrical body has an outer peripheral surface having a shape in which an outer air passage opening on the base side of the cylindrical body is formed between the body and the probe paper tube, and the tip of the cylindrical body is in contact with the probe connector of the probe. The present invention relates to a tar-stick preventive holder for a thermometer for molten metal, which is provided with a vent hole that allows the inner vent passage and the outer vent passage to communicate with each other.

Hereinafter, embodiments of the tar-stick prevention type holder of the thermometer for molten metal according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view showing the inside by cutting off a part of a cylindrical body of one embodiment of a tar-stick prevention type holder of a thermometer for molten metal according to the present invention, and FIGS. 2 (a), (b), (C) and (d) are lines A-A, B-B, C-C and D- in FIG. 1, respectively.
The D line is an end view of only the cylindrical body, and FIG. 3 is a side view of another embodiment of the tar-stick prevention holder of the thermometer for molten metal according to the present invention, and FIGS. 4 (a), (b), ( (C) and (d) are end views of only the cylinder of AA line, BB line, CC line and DD line in FIG. 3, respectively, and FIG. 5 shows a part of the cylinder. An example of the shape is shown in (a) in a side view, (b) in an end view taken along the line AA in FIG. (A), and FIGS. 6 and 7 respectively show modes of the tip of the tubular body (a). ) Is a side view and (b) is A-A in (a).
A line sectional view, FIG. 8 is a side explanatory view showing the inside by cutting off a part of the thermometer in which the resin sticking prevention type holder of the thermometer for molten metal according to the present invention is used, and FIG. X in the figure
It is an expanded explanation sectional view of a part.

[Description of configuration]

In the drawings, 7 is a holder according to the present invention, which is a molten metal.
The probe connector 5 electrically connected to the thermocouple 4 attached to the tip of the probe paper tube 3 immersed in 15 through the compensating lead wire 6 is connected to the thermocouple 4 side and the probe connector 5 by the base portion 5c. A holder for holding the probe 2 mounted in the probe paper tube 3 in a state in which the ventilation with the electrodes 5a, 5b side is blocked, and which is inserted until the base portion 5c of the probe connector 5 almost abuts its tip. The main body is a tubular body 8 which has an inner air passage 8b and a holder connector 9 in the peripheral wall of the tip thereof, and an electrode 9a of the holder connector 9 when the probe 2 is externally inserted. , 9b is the electrode 5a of the probe connector 5,
It is exactly the same as the conventional holder 7 ', in that it comes into contact with the 5b and causes the electromotive force from the thermocouple 4 to be energized to the external device by the compensation lead wire 10 to display the temperature. First
In the embodiment shown in FIGS. 3, 3 and 8 and the probe 2 combined therewith, the shapes of the cylindrical body 8 and the probe paper tube 3, the shape of the holder connector 9 and the shape of the probe connector 5, and accordingly the electrodes 9a, 9b, 5a, Although the shape of 5b is different and the shape of the base portion 5c of the probe connector 5 is also different, it is functionally the same as the conventional one.

The feature of the present invention is that the probe paper tube 3 is inserted between the holder 8 and the probe paper tube 3 from the base 8a side to the tip of the tube body 8 as shown in FIG. Cylinder 8
That the cylindrical body 8 has an outer peripheral surface having a shape in which the outer ventilation path 12 having the ventilation outlet 12a opening on the base 8a side is formed, and the tip of the cylindrical body 8 is the base of the probe connector 5 of the probe 2. Inner air passage 8b even when in contact with 5c
And a ventilation port 8c for connecting the outer ventilation passage 12 to each other is provided on the tip peripheral wall of the cylindrical body 8.

First, there are various modes as the shape of the outer peripheral surface of the cylindrical body 8 which forms the outer ventilation path 12 between the outer peripheral air passage 12 and the probe paper tube 3, which is the first feature. In the first mode, at least a part of the outer peripheral surface of the cylindrical body 8 has a cross-sectional shape (for example, a circular shape) with the inner peripheral surface of the probe paper tube 3 (and thus, a circular sectional shape, for example) (in this case, the cylindrical body). It is natural that the outer shape of the probe 8 is small).
This is a case in which the small projection 8h is provided as shown in FIGS. 1 and 2 for keeping the gap between the inner peripheral surface of the and the inner peripheral surface of the same at a predetermined size. Second
In this mode, at least a part of the outer peripheral surface of the cylindrical body 8 has a cross-sectional shape that is asymmetric with the cross-sectional shape (for example, a circle) of the inner peripheral surface of the probe paper tube 3 (for example, a polygonal shape or a shape having a concave portion on the outer circumference). In this case, the inner peripheral surface of the probe paper tube 3 is in contact with the portion having the maximum diameter, and the outer ventilation passage 12 is formed in the other portion. A third aspect is a case in which the first aspect and the second aspect are combined and the non-symmetrical outer peripheral surface portion is located closer to the center of the cross section than the compatible outer peripheral surface portion. The cylindrical body 8 of the embodiment shown in FIGS. 1 and 3 is formed by connecting four portions of a fixed portion 8d, an intermediate portion 8e, a holder portion 8f and a connector cover 8g from the base portion 8a side toward the tip. However, these are for facilitating the internal work such as production of the cylindrical body 8 and wiring, and also for allowing partial replacement. Fixed part
8d is configured so that the ventilation outlet 12a is formed with the probe paper tube 3 being externally inserted. The cylindrical body 8 shown in FIGS. 1 and 3 is for holding the probe 2 mainly having the probe paper tube 3 having the inner peripheral surface having a circular cross section, and the outer peripheral surface for forming the outer ventilation passage 12. The shape of belongs to the third aspect. That is, the cross-sectional shape of the outer peripheral surface of each of the four portions forming the tubular body 8 corresponds to the line AA, the line BB, the line C-C, and the line D-D in FIGS. 1 and 3, respectively. 2 and 4 (a) showing the cross section at each point,
As shown in (b), (c), and (d), the outer peripheral surface portion 8i (hereinafter, sometimes referred to as the compatible outer peripheral surface portion) of the probe paper tube 3 and the inner peripheral surface of the probe paper tube 3 and the probe paper Inner peripheral surface of pipe 3 and outer peripheral surface portion 8j that is incompatible with each other (hereinafter, sometimes referred to as an incompatible outer peripheral surface portion, is flat in FIG. 1 and groove-shaped in FIG. 3) And a small protrusion 8h is provided on the corresponding outer peripheral surface portion 8i of the fixed portion 8d and the holder portion 8f. Examples of the shape of the small projection 8h include a hemispherical shape and a prismatic shape as shown in the above-mentioned example, but it is long along the cylinder axis as shown in FIG. 5 and has an angle θ of about 15 ° at both ends. The small protrusion 8h with a gentle inclination is attached to the middle part 8e of the holder part 8f.
If multiple pieces are provided on the outer peripheral surface of the nearby part, small protrusions will appear on other parts.
It does not matter if 8h is not provided. The required distance between the inner peripheral surface of the probe paper tube 3 forming the outer air passage 12 and the outer peripheral surface of the tubular body 8 is usually about 2 mm or more, and accordingly, the small distance in the first and third aspects. Height H _{1 of} protrusion 8h (for example, second
The maximum distance between the inner peripheral surface of the probe paper tube 3 in H ₁ ) of FIG. 4A and the second mode is set to approximately 2 mm or more. The height difference H ₂ between the non-symmetrical outer peripheral surface portion and the non-symmetrical outer peripheral surface portion in the third aspect (for example, H ₂ in FIG. 2A, FIG. 4A)
H ₂ ) of 2 mm or more is sufficient. However, these heights and differences in height may be smaller than the above values depending on the difference in the object to be measured and the material of the probe paper tube 3. When measuring the temperature of a metal, it is sufficient that the above H ₁ is 1.5 mm and the difference H ₂ is 1 mm. A width W of 5 mm is sufficient for the non-symmetric outer peripheral surface portion (that is, the groove) of the embodiment shown in FIG. As shown in FIG. 9, the connector cover 8g is easily attached to and detached from the holder portion 8f with the screw portion 8ga and constitutes the leading end of the cylindrical body 8. The diameter of the probe paper tube 3 can be reduced as it is to form a sufficient gap with the inner peripheral surface of the probe paper tube 3. In the illustrated example, as shown in FIG. 9, the connector cover 8g can be easily attached to and detached from the end portion of the holder portion 8f by the screw portion 8ga. In this manner, the outer ventilation passage 12 having the ventilation outlet 12a is formed between the cylindrical body 8 and the probe paper tube 3 on the base 8a side of the cylindrical body 8 as shown in FIG.

Next, the ventilation port 8c provided in the connector cover 8g at the tip of the cylindrical body 8 for communicating the inner ventilation passage 8b of the cylindrical body 8 and the outer ventilation passage 12 which is the feature of FIG. As shown in FIG. 6, a hole may be formed as a hole while leaving the edge of the tip slightly, or as shown in FIG. 7, a notch may be formed by cutting a part of the edge together with the edge of the tip. Vent 8c is desirably large enough and number to allow the cooling gas to pass through,
For example, eight pieces each having a size of 2 mm × 4 mm are shown. With such a vent hole 8c, the inner vent passage 8b and the outer vent passage 12 are communicated with each other when the probe 2 is externally inserted in the holder 7, as shown in FIGS. 8 and 9. It should be noted that in the state where the probe paper tube 3 is externally inserted into the tubular body 8, the tip of the tubular body 8 and the base portion 5c of the probe connector 5 are
When a gap is formed between the probe 2 and the probe 2 and the probe 2 is configured to be firmly held, this gap is used as a vent.
It can act as 8c.

As described above, the holder 7 according to the present invention is provided with the probe paper tube 3
It is configured to have an outer peripheral surface having a shape that forms an outer ventilation path 12 between the inner and outer surfaces and a ventilation port 8c that communicates it with the inner ventilation path 8b.

[Work]

In order to measure the temperature of the molten metal 15 using the resin-stick holder of the thermometer for molten metal according to the present invention, the probe paper tube 3 of the probe 2 is attached to the holder 7 as shown in FIG. The base 5c of the probe 5 is externally inserted until it comes into contact with the tip of the holder 7, and the electrodes 5a and 5b of the probe connector 5 and the holder connector are attached as shown in FIG. 9 (the outer peripheral surface of the tubular body 8 is not shown in a specific shape). A thermometer 1 is constructed by bringing the electrodes 9a and 9b of 9 into contact with each other, and is attached to a lance 13 as shown in FIG. 10, for example, and cooling gas is supplied at a pressure of 1.5 kg /
The temperature is measured by immersing it in the molten metal 15 while blowing it from the base portion 8a side of the cylindrical body 8 into the inner ventilation passage 8b with cm ² G.
Smoke is generated inside the probe paper tube 3 from the probe paper tube 3 due to the high temperature molten metal 15, but the smoke is blown from the side of the base 8a of the cylindrical body 8 and the inside air passage is followed according to the arrows shown in FIGS. 8 and 9. The smoke together with the cooling gas passing through the ventilation hole 8c from 8b is completely purged to the outside through the ventilation hole 8c through the outer ventilation passage 12, and no smoke enters the inside of the cylindrical body 8. It is important to maintain the outer ventilation passage 12 for purging smoke with such cooling gas without blocking it, and the complete configuration is adopted in the present invention. In the case where the third mode is adopted as the shape, even if the probe paper tube 3 is deformed and the outer passage 12 is closed at the corresponding outer peripheral surface portion 8i of the tubular body 8, Ventilation is determined by the outer peripheral surface 8j. When the predetermined measurement work is completed, the thermometer 1 is pulled up and the probe 2 is replaced with a new one, but the holder 7 does not need to be carefully cleaned and can be repeatedly used as it is.

〔The invention's effect〕

The tar-stick preventing type holder of the thermometer for molten metal according to the present invention has the following effects by operating as described above.

(I) Even if the holder is repeatedly used, no tar is attached to the holder connector, and the insulation between the electrodes is never lowered. According to the practice of the inventors, 2,000
The resin did not adhere at all after continuous use.

(Ii) The re-temperature measurement rate due to an abnormal temperature measurement value is reduced, and wasteful probe consumption and time loss are reduced. According to the practice of the present inventors, the re-temperature measurement rate was 3.86% in the past, but it decreased to 0.75% by using the holder according to the present invention.

(Ii) The temperature measurement accuracy is stable, and it is possible to avoid waste of time and unnecessary use of materials such as oxygen due to unnecessary extension of process time due to poor accuracy. Further, it can contribute to the improvement of the yield by improving the target value precision ratio of the metal component.

(Iv) The removal of the tar by hand is no longer necessary, and the measuring device can be unmanned.

(V) The number of man-hours for repair and maintenance of the holder is significantly reduced. According to the implementation of the present inventors, it was possible to reduce about 70%.

[Brief description of drawings]

FIG. 1 is a side view showing the inside by cutting off a part of a cylindrical body of one embodiment of a tar-stick prevention type holder of a thermometer for molten metal according to the present invention, and FIGS. 2 (a), (b), (C) and (d) are lines A-A, B-B, C-C and D- in FIG. 1, respectively.
An end view of only the cylindrical body of the D line, FIG. 3 is a side view of another embodiment of the tar-stick preventing type holder of the thermometer for molten metal according to the present invention, and FIGS. 4 (a), (b), ( (C) and (d) are end views of only the cylinder of AA line, BB line, CC line and DD line in FIG. 3, respectively, and FIG. 5 shows a part of the cylinder. An example of the shape is shown in (a) in a side view, (b) in an end view taken along the line AA in FIG. (A), and FIGS. 6 and 7 respectively show modes of the tip of the tubular body (a). ) Is a side view and (b) is A-A in (a).
A line sectional view, FIG. 8 is a side explanatory view showing the inside by cutting off a part of the thermometer in which the resin sticking prevention type holder of the thermometer for molten metal according to the present invention is used, and FIG. X in the figure
An enlarged explanatory cross-sectional view of the part, FIG. 10 is an explanatory view showing the temperature measurement state of the molten metal in the converter, and FIG. 11 (a) is an example of a molten metal thermometer using a conventional holder. (B) is a sectional explanatory view showing a cooling state of the holder of the same molten metal thermometer. 1 ... Thermometer for molten metal 2 ... Probe 3 ... Probe paper tube 4 ... Thermocouple 5 ... Probe connector 5a ... Electrode 5b ... Electrode 5c ... Base 6 ... Compensation lead wire 7 ... Present invention Holder 7 '…… Conventional holder 8 …… Cylinder 8a …… Base 8b …… Inner vent 8c …… Vent 8d …… Fixed 8e …… Intermediate 8f …… Holder 8g …… Connector cover 8ga …… Screw part 8h …… Small protrusion 8i …… Outer peripheral surface part that is compatible with the inner surface of the probe 8j …… Outer peripheral surface part that is not compatible with the inner surface of the probe 9 …… Holder connector 9a …… Electrode 9b… … Electrode 9c… Vent hole 10… Compensation lead wire 11 …… Cylinder 12 …… Outside vent passage 12a …… Vent outlet 13 …… Lance 14 …… Converter furnace body 15 …… Melted metal 16 …… Compensation lead wire H ₁ ...... Height of small protrusion H ₂ ...... Height difference between the outer peripheral surface part and the outer peripheral surface part that are not matched W ...... Groove-shaped non-uniform outer surface Width of peripheral part

Claims (6)

[Claims] 1. A probe connector electrically connected via a compensating conductor (6) to a thermocouple (4) attached to the tip of a probe paper tube (3) immersed in a molten metal (15). In the probe paper tube (3), the base (5c) blocks the ventilation between the thermocouple (4) side and the electrodes (5a), (5b) side of the probe connector (5) by the base (5c). A holder for holding the attached probe (2), which is mainly composed of a tubular body (8) which is externally inserted until the base portion (5c) of the probe connector (5) substantially abuts on its tip. 8) has a holder connector (9) electrically connected to the probe connector (5) and energizing the outside in the outer peripheral state of the tip peripheral wall of (8), and from the base (8a) of the tubular body (8). Inside the cylindrical body (8) up to the tip, on the base (8a) There shall apply in holders made provided inside the ventilation path (8b) communicating with the outside, the base of the cylindrical body in the extrapolation state of the probe paper tube (3) (8) (8
Tube body (8) from the a) side to the tip and probe paper tube (3)
The outer peripheral surface of the cylindrical body (8) having an outer air passage (12) opening on the base (8a) side is formed between the cylindrical body (8) and the cylindrical body (8).
And a vent hole (8c) that allows the inner air passage (8b) and the outer air passage (12) to communicate with each other even when the tip of the tubular body (8) is in contact with the probe connector (5) of the probe (2). 1. A tar-stick prevention holder (7) for a molten metal thermometer, characterized by being provided with. 2. A probe paper tube, wherein the outer peripheral surface of the cylindrical body (8) has a cross-sectional shape in which at least a part of the outer peripheral surface is compatible with the cross-sectional shape of the inner peripheral surface of the probe paper tube (3). The invention according to claim 1, wherein (3) has a small projection (8h) for keeping a gap with the inner peripheral surface of the probe paper tube (3) to a predetermined size in a state of being externally inserted. A stick-prevention-type holder (7) for the thermometer for molten metal described. 3. A probe paper, wherein the outer peripheral surface of the tubular body (8) has a cross-sectional shape which is asymmetric to at least a part of the outer peripheral surface of the inner peripheral surface of the probe paper tube (3). The thermometer for molten metal according to claim 1, wherein the pipe (3) is in contact with the inner peripheral surface at the maximum diameter portion and forms the outer ventilation passage (12) at the other portion. Dust adhesion prevention type holder (7). 4. The shape of the outer peripheral surface of the cylindrical body (8) is such that a part of the outer peripheral surface has a sectional shape which is compatible with the sectional shape of the inner peripheral surface of the probe paper tube (3). It has a small protrusion (8h) for keeping a gap with the inner peripheral surface of the probe tube (3) in a predetermined size in the state of being externally inserted, and the other part of the probe tube (3) is It has a cross-sectional shape that is non-symmetrical to the cross-sectional shape of the inner peripheral surface and is located closer to the cross-sectional center than the outer peripheral surface portion of the cross-sectional shape that is non-symmetrical to the inner peripheral surface of the probe paper tube (3). A tar-stick prevention holder (7) for a thermometer for molten metal according to claim 1. 5. A ventilation port (8) provided at the tip of a cylindrical body (8).
C) is a hole which is perforated as a hole, and is described in any one of claims 1 to 4, wherein the holder (7) for preventing sticking of a tar in the thermometer for molten metal. 6. A ventilation hole (8) provided at the tip of a cylindrical body (8).
The claw adhesion prevention type holder for a thermometer for molten metal according to any one of claims 1 to 4, wherein c) is a notch in which both edges of the tip are cut off. (7).