KR950012631B1 - Thermocouple for surface temperature of continous casting - Google Patents

Abstract

The thermocouple(4) comprises a guide(1) having has a plurality of pins(2) and a hole(3a) of a constant diameter in its center, and a logitudinal cut groove(3b) extending from the one side of the hole. A disc type thermocouple tip(4) has a respective protrusion(5a) in the respective center of both surfaces thereof, and is mounted in the hole(3a) of the thermocouple(4). A thickness(D1) of the thermocouple tip(4) is over twice as large as that(D2) of the guide(1), and a gap between the thermocouple tip and the guide holes is 2-10mm.

Description

Thermocouple for surface temperature measurement

1 is a schematic diagram showing a method for measuring the surface temperature of cast steel.

FIG. 2 shows a conventional thermocouple for measuring the surface temperature of a slab, and is a sectional view taken along the line A-A 'of FIG. 2 (a) or a plan view, and FIG. 2 (b) or 2 (a).

3 is a plan view showing a thermocouple for measuring the surface temperature of the cast steel of the present invention.

4 is a cross-sectional view taken along the line B-B 'of FIG.

5 is an exploded perspective view of the thermocouple of FIG.

6 and 7 are graphs showing the results of measuring the slab surface temperature by a thermocouple.

* Explanation of symbols for main parts of the drawings

1: Guide 2: Pin

3: home 4: thermocouple

5: thermocouple team 6: thermocouple ship

The present invention relates to a thermocouple used to measure the surface temperature of a casting cast in a continuous casting machine, and more particularly, to a thermocouple for measuring the surface temperature of a casting cast to enable the surface temperature of the casting cast to be accurately measured.

In the case of producing castings by the continuous casting method, the surface temperature management of the castings is very important. In the casting machine, the cast is subjected to bending and straightening during casting, and in this process, a large stress is applied to the surface of the cast. In addition, while the steel solidifies and cools in molten steel, there is a temperature section in which the toughness of the steel drops rapidly. That is, a defect occurs in the surface of the cast steel when the surface temperature of the slab in the section to which a large stress is applied becomes a temperature at which the toughness drops sharply. When the surface bond occurs in the cast steel as described above, the productivity of the operation is reduced, and in severe cases, the cast steel cannot be used.

As a result, the surface temperature management of the cast steel is very important in order to suppress the occurrence of surface defects of the cast steel, and in order to control the surface temperature of the cast steel, it is necessary to first measure the surface temperature of the cast steel being cast.

In general, to measure the temperature of the casting being cast, a thermocouple 101 is inserted between the roller roll 102 and the cast steel 103 as shown in FIG. 1, and the thermocouple tip 104 is firmly attached to the surface of the cast steel. It is possible to measure the surface temperature of cast steel, but it is impossible to enter and measure it directly in the casting machine, so that a thermocouple is inserted between the caster roll and the cast steel at a distance of more than 1m by installing a certain type of guide (not shown). Work as much as possible.

By the way, the thermocouple provided by the said method receives the reduction by the player roll 101 repeatedly. That is, as shown in FIG. 1, the thermocouple tip 104 is pressed down by the player roll 102, and then proceeds to the space portion 105 between the player rolls 102, wherein the space portion ( 105 does not have any pressing force to bring the thermocouple tip 104 into good contact with the surface of the slab, but rather the lower portion of the thermocouple tip 104 is pushed down by the roll of roll 102 so that the thermocouple tip 104 has a slab surface. Floated up and off. If the floated thermocouple tip 104 is repeatedly pressed down by the player roll 102, the thermocouple tip 104 is eventually cut as it is rolled over. If this happens, the measurement of the surface temperature of the slab becomes impossible.

On the other hand, a conventional method for suppressing the above phenomenon is shown in Figure 2, the structure of the thermocouple in the one side direction from the center to the guide (202) formed with a plurality of pins (201) (203) is attached, and the other side is made of a structure for measuring the temperature by attaching the iron plate (204).

The thermocouple for measuring the surface temperature of a conventional cast piece having the above structure, the small pin 201 is attached to the lower portion of the thermocouple guide 202, so that the thermocouple guide 202 is easily stuck to the surface of the cast piece, the thermocouple tip ( 205 is too small and the thermocouple tip 205 is in close contact with the plate-shaped guide 202 so that the thermocouple tip 205 is initially measured when the pin 201 begins to lodge on the surface of the slab. Not only is it impossible to measure the surface temperature of the cast steel by being separated from the surface of the cast steel, but also a space is generated between the thermocouple tip 205 and the surface of the cast steel in the process of repeatedly receiving the pressing by the roll. If a space occurs between the thermocouple tip 205 and the cast surface, a difference occurs between the actual temperature and the measured temperature of the cast surface.

Then, the thermocouple tip 205 is in close contact with the guide 202, the temperature of the surface of the slab is made, the temperature of the guide itself affects the temperature of the thermocouple tip 205. Therefore, it is difficult to accurately measure the temperature of the playing cast surface.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The object of the present invention is not only to easily embed the thermocouple tip on the surface of the cast steel, but also to prevent the tip of the thermocouple from being separated from the thermocouple wire, It is to provide a thermocouple for measuring the surface temperature of the casting cast steel that can effectively measure the surface temperature of the casting cast during casting by preventing interference.

As a technical configuration for achieving the above object, the present invention, in the thermocouple for measuring the surface temperature of the cast steel is a guide having a plurality of pins formed, the thermocouple is attached to one side of the long side direction and the iron plate attached to the other side, The guide forms a hole having a constant diameter in the center thereof, and forms a cutout groove in one side of the hole, and at the end of the thermocouple, a disc-shaped thermocouple tip having protrusions formed at both ends of the center part, as well as the thickness of the thermocouple tip. Is formed to be more than twice the thickness of the guide, and the gap between the thermocouple tip and the hole of the guide is formed by 2-10mm to provide a thermocouple for measuring the surface temperature of the cast slab, characterized in that it can accurately measure the surface temperature of the cast steel By

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

3 to 5 are a plan view, a cross-sectional view and a perspective view of a thermocouple according to the present invention, in which a guide 1 having a male groove 3 has a plurality of pins 2 on its bottom surface. The groove 3 is equipped with a sheathed thermocouple 4.

The thermocouple 4 is composed of a thermocouple wire 6 and a disk-shaped thermocouple tip 5, the thermocouple tip 5 has convex protrusions 5a at both ends of the center portion, the thermocouple tip 5 The thickness D1 of) is twice or more than the thickness D2 of the guide 1.

In addition, the thermocouple tip 5 is fitted into the circular portion 3a of the groove 3, and the thermocouple wire 6 is fixed to the straight portion 3b of the groove 3 by means of silver welding (7). The thermocouple tip 5 and the circular portion 3a of the groove 3 have a spacing D3 of 2-10 mm.

On the other hand, the iron plate 8 is mounted to the guide 1, the direction is configured to form in the opposite direction of the thermocouple (4). Referring to the operation and effects of the present invention configured as described above are as follows.

As shown in FIGS. 3 to 5, a sheath thermocouple 4 is formed in the groove 3 of the guide 1 in which the plurality of fins 2 are formed, and the disc-shaped tip of the thermocouple 4 ( 5) the thickness (D1) is more than twice as thick as the guide thickness (D2), so that the projection 5a of the thermocouple tip (5) is easily pressed into the surface of the slab (not shown) from the initial temperature measurement .

On the other hand, the distance D3 between the thermocouple tip 5 and the circular groove 3a of the guide groove 3 is 2-10 mm, when the distance D3 is less than 2 mm, the thermocouple tip 5 is relatively thick. The thermocouple wire 6 between the thermocouple tip 5 and the guide 1 is locally excessively bent due to the thickness deviation between the thermocouple tip 5 and the guide 1 when rolled by this machine roll and embedded in the surface of the cast steel. Easy to cut Then, when the distance D3 between the thermocouple tip 5 and the guide 1 is 10 mm or more, the thermocouple tip 5 is excessively bent upwards, and the thermocouple wire 6 overlaps when pressed by the next machine roll. Because it is cut while making.

Accordingly, the present inventors maintain a proper distance between the thermocouple tip 5 and the guide 1 so that the thermocouple tip 5 is accurately made from the initial measurement of the surface temperature of the cast steel, and the thermocouple tip 5 is not cut. Based on this, the thickness D1 of the thermocouple tip 5 and the distance D3 between the thermocouple tip 5 and the guide 1 were defined.

6 and 7 show the results of measuring the surface temperature of the slab using the conventional thermocouple and the thermocouple according to the present invention. 6 is a result of temperature measurement using a conventional thermocouple, the temperature of the initial measurement temperature of the slab surface temperature was very low because the thermocouple tip 205 is not sufficiently inserted into the slab surface, as well as repeatedly rolled by the machine roll As the surface temperature of cast steel changes periodically, accurate measurement was not possible.

In other words, the responsiveness, which is the core technology of thermocouples, appeared to be bad. On the contrary, in the thermocouple according to the present invention, the accurate temperature was measured from the initial temperature measurement as in the seventh degree, the response was excellent, and the thermocouple 4 tip was not cut even after passing through several rolls of the player.

As described above, according to the thermocouple for measuring the surface temperature of the cast steel of the present invention, the thermocouple tip 5 and the guide 1 are spaced D3 and the thickness D1 of the thermocouple tip 5 is made constant, thereby providing a thermocouple ( There is an excellent effect that can prevent the damage of 4) and accurate temperature measurement.

Claims (1)

In the guide 1 having a plurality of pins 2, the thermocouple 4 is attached to one side of the long side direction and the thermocouple 4 is attached to the other side to measure the surface temperature of the cast steel. (1) forms a hole 3a having a predetermined diameter in the center thereof, and forms a cutout groove 3b on one side of the hole 3a, and protrudes 5a at both ends of the center portion at the end of the thermocouple 4. Is equipped with a disc-shaped thermocouple tip (5), as well as the thickness (D1) of the thermocouple tip (5) is formed more than twice the guide thickness (D2), the thermocouple tip (5) and the guide (1) The distance (D3) and the hole (3a) of the thermocouple for measuring the surface temperature of the cast slab, characterized in that formed by 2-10mm to accurately measure the surface temperature of the cast steel.