JPH0461740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a temperature measuring device for a continuous casting mold, and particularly aims to realize accurate temperature measurement of a mold copper plate during continuous casting.

(Prior art) In continuous casting, the temperature of the molded copper plate is usually measured with a thermocouple in order to predict surface defects in the slab pulled out of the mold or to prevent troubles such as breakouts. We are currently operating. As a specific technique for attempting to measure the temperature of such a molded copper plate, Japanese Patent Application Laid-Open No. 61-232048 describes
A holder equipped with an O-ring at the tip and a thermocouple introduced inside is installed between the outer wall of the cooling box, penetrates the inner wall, and reaches the back of the molded copper plate, and the holder is inserted into the copper plate through the O-ring. Disclosed is a device that measures temperature using a thermocouple while preventing cooling water from entering when pressed against the thermocouple.

(Problems to be Solved by the Invention) The conventional technology disclosed in the above publication has the following problems. Namely: 1) Since it is necessary to drill holes in the inner wall (backup plate) of the cooling box, the mold must be disassembled when installing the temperature measuring device, and this disassembly also removes the heat that has accumulated on the copper plate of the mold. Since thermal strain is released, deformations such as warping and twisting of the copper plate are inevitable, and when reassembling the copper plate, it is necessary to press or cut the copper plate to flatten it.

2) It is necessary to install an accessory on the outer surface of the cooling box to help prevent cooling water from entering the tip of the thermocouple, which may interfere with the piping surrounding the mold or the mold vibration mechanism, causing damage to existing equipment. was not applicable in some cases. 3) The cooling water flowing through the water passage provided on the back of the copper mold plate usually has a gauge pressure of 6 to 10 Kgf/ ^cm2 , while the pressure of the temperature measuring atmosphere is 0 (atmospheric) to 2.
Since the pressure is about Kgf/cm ² , a pressure difference of 4 to 8 Kgf/cm ² occurs between the water passage groove and the temperature measuring atmosphere. For this reason, even though the space between them is sealed using a gasket or the like, leakage of cooling water into the temperature measuring atmosphere is unavoidable. Furthermore, 4) When installing a temperature measuring device, it is necessary to press the thermocouple housed inside against the copper plate to prevent it from buckling, so the diameter of the thermocouple inevitably becomes large (usually 3.0 mm or more in diameter). This resulted in a disadvantage that temperature measurement sensitivity became low and accurate temperature behavior could not be measured.

It is an object of the present invention to provide a temperature measuring device with a compact structure that can realize stable and accurate temperature measurement of a molded copper plate without the above-mentioned conventional problems.

(Means for Solving the Problems) The present invention provides thermoelectric power to a continuous casting mold that combines a copper mold plate forming a continuous casting mold and a cooling box that is fitted to the back side of the copper plate to fixedly hold the copper plate. A device for measuring the temperature of the mold copper plate, wherein a through hole is formed in a mounting bolt connecting the mold copper plate and the cooling box to connect the front end and the rear end of the mounting bolt. A first hollow cylindrical body is provided in the through hole and is provided with a tip and a water sealing means on the inner circumferential surface of the tip and is slidable along the through hole; a first coil to be pressed against the back surface of the mold copper plate; and a second hollow cylindrical body that engages with the rear end of the first coil and is fixed with screws within the through hole; Inside the body, the first coil and the second hollow cylindrical body,
A thermocouple fixing stopper that engages with the water sealing means on the inner surface of the tip of the first hollow cylindrical body and is movable together with the hollow cylindrical body, a second coil that supports this thermocouple fixing stopper, and a second coil that supports the thermocouple fixing stopper. A thermocouple introduction tube is provided that engages with the rear end of the coil and is fixed with a screw by the second hollow cylindrical body, and the thermocouple that controls the temperature measurement of the molded copper plate is held in the thermocouple fixing stopper through the introduction tube. This is a temperature measurement device for continuous molds.

Now, FIG. 1 shows the configuration of a temperature measuring device according to the present invention. In the figure, number 1 is a mold copper plate forming a continuous casting mold, 1a is a water passage groove for passing cooling water, 2 is a cooling box, and this cooling box 2 is fitted to the back of the mold copper plate 1 to fix the copper plate. Hold. Reference numeral 3 denotes a mounting bolt that controls the connection between the mold copper plate 1 and the cooling box 2, and this mounting bolt 3 is provided with a through hole 3a that connects its front end and rear end. Reference numeral 4 designates a first hollow cylindrical body having a tip and water sealing means 4a and 4b on the inner circumferential surface of the tip;
It is designed to be able to slide along a. 5
is a first coil, and the first coil 5 presses the first hollow cylindrical body 4 against the mold copper plate 1 via the water sealing means 4aaa. Reference numeral 6 designates a second hollow cylindrical body, and this cylindrical body 6 engages with the rear end of the first coil 5 and is screwed and fixed within the through hole 3a with a threaded portion 6a formed on its outer periphery. Further, 7 is a holder that engages with the inner surface of the first hollow cylindrical body 4 via a water sealing means 4b and is movable together with the hollow cylindrical body 4, 8 is a second coil that supports the holder 7, and 9 is a thermoelectric coil. This introduction tube 9 engages with the rear end of the second coil and has a threaded portion 9a formed on its outer periphery.
The second hollow cylindrical body 6 is fixed with screws. Further, 10 is a gasket for fixing the mounting bolt 3, and 11 is a stopper for keeping the shrinkage margin of the second coil 8 constant and the pressing force (load) of the thermocouple TC against the molded copper plate 1 constant. A thermocouple TC, which is responsible for measuring the temperature of the mold copper plate 1, is held in a holder 7 through an introduction pipe 9, and its tip comes into contact with the back surface of the mold copper plate 1 under a predetermined load.

(Function) During continuous casting, the cooling water flowing through the water passage grooves 1a of the mold copper plate 1 may leak from the mating surface with the cooling box 2 due to water pressure. → If the water enters the mounting bolt 3 side via B, the water sealing means 4a will prevent A → B→
If the cooling water enters via C→D, it is shut off by the water sealing means 4b, and the cooling water is discharged to the outside through the opening of the thermocouple introduction pipe 9, so that the thermocouple
The TC is completely unaffected by leaked cooling water, and even if the copper plate 1 is thermally deformed during operation, the first
The hollow cylindrical body 4 and the holder 7 that holds the thermocouples T, C follow their movements by the first coil and the second coil, respectively, and the contact posture of the water sealing means 4c, 4b does not change. Stable temperature measurement can be achieved.

Here, as the water sealing means, it is possible to specifically use a material that can withstand the temperature of the copper plate, such as an O-ring made of fluorine or Teflon, or a metal packing made of copper or aluminum.

In addition, in the device of the present invention, the tip of the thermocouple can be fixed to the holder 7 with the tip thereof preferably protruding by about 1 to 3 mm, so a thermocouple with a relatively small diameter, for example, about 1 to 2 mm in diameter can be However, there is no possibility of buckling, and the temperature measurement sensitivity can be advantageously increased. By the way, in the case of commercially available sheath type thermometers, when immersed in boiling water from room temperature to 100℃, the time it takes to reach 90% of the boiling water temperature is 0.16 seconds for a 1 mm diameter one, and 0.16 seconds for a 4.8 mm diameter one.
4.1 sec, and the sensitivity is significantly improved by using a wire with a small diameter.

In addition, when O-rings were used for the water sealing means 4a and 4b, conventionally they could be damaged during assembly, but in the present invention, even if the second hollow cylindrical body 6 is screwed in, the first coil is not interposed. Therefore, the first hollow cylindrical body 4 does not rotate, and even if the thermocouple introduction tube 9 is screwed in, the stopper 7 does not rotate due to the interposition of the second coil.
There is no damage to the ring or anything like that.

(Example) A through hole 3a with an inner diameter of 10 mm is formed in a SUS630 mounting bolt 3 having an outer diameter of 18 mm, a length of 470 mm, and a threaded portion with a nominal diameter of M18. 9.0mm, inner diameter 5.5mm, length 400mm,
A first hollow cylindrical body 4 made of SUS304 and an outer diameter
9.0mm, inner diameter 5.5mm, spring constant 4Kgf/mm, material
A first coil 5 (square cross section) made of SUS304, a second hollow cylindrical body 6 made of SUS304 with an outer diameter of 9.0 mm, an inner diameter of 5.5 mm, and a length of 27 mm, and the insides of these are silver soldered. A copper holder 7 has a sheathed T-type thermocouple with an outer diameter of 1.0 mm fixed at a position 3 mm from the tip, an outer diameter of 5.0 mm, an inner diameter of 3.5 mm, and a spring constant of 1 Kgf/
mm, second coil 8 made of SUS304, outer diameter 5.0
A thermocouple introduction tube 9 made of SUS304 with an inner diameter of 3.5 mm and a length of 440 mm was installed, and an attempt was made to measure the temperature of a molded copper plate during continuous casting.

In addition, as the water sealing means 4a and 4b, fused O-rings with a heat resistance temperature of 260° C. and 200° C. are applied, respectively, and the pressing load of the first hollow cylindrical body 4 by the first coil 5 is 11 kg. second coil 8
The holding load of the stopper was set to 5 kg.

The pressure of the cooling water passing through the water passage 1a was 8 Kgf/ ^cm2 , and during casting, leakage of cooling water was observed from the introduction pipe 9, but the temperature reading remained stable between 150 and 350°C. It was confirmed that it was.

After 500mm heat casting, only the temperature measuring device was removed and examined, and a carbonized part was found on the contact surface side of the water sealing means 4a with the copper plate 1, but there was no evidence of cooling water leakage. There was no change in the water sealing means 4b. Here, the temperature could be measured stably even though the water sealing means 4a was partially carbonized because the pressure in the cooling box hardly acted on the water sealing means 4a and all of it flowed out from the introduction pipe 9. Therefore, its effectiveness was confirmed.

In addition, I tried to measure the temperature using a copper gasket instead of the O-ring, but there was no problem at all, and I was able to achieve stable temperature measurement as described above.

(Effects of the Invention) According to the present invention: 1) When incorporating the temperature measuring device, there is no need to disassemble the mold, so there is no need to worry about shortening the life of the copper plate of the mold or discarding it.

2) Temperature measurement can be performed stably and accurately since there is no cooling water entering the temperature measuring section.

3) Sensitivity can be improved because the wire diameter of the thermocouple can be made smaller.

4) Since the heating device is housed within the mounting bolt, it is very compact and does not interfere with other devices, making it highly versatile.

This has the effect of realizing highly reliable operation.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a temperature measuring device according to the present invention. 1...Mold copper plate, 1a...Water groove, 2...Cooling box, 3
... Mounting bolt, 3a... Through hole, 4... First hollow cylindrical body, 4a, 4b... Water sealing means, 5... First coil, 6... Second hollow cylindrical body, 7... Holder, 8...
Second coil, 9... thermocouple introduction tube, 10... packing, 11... stopper.

Claims (1)

[Scope of Claims] 1. A thermocouple is disposed in a continuous casting mold that combines a copper plate forming a continuous casting mold and a cooling box that fits on the back side of the copper plate and holds the copper plate fixedly. A device for measuring the temperature of a molded copper plate, wherein a through hole is formed in a mounting bolt connecting the molded copper plate and a cooling box to connect a front end and a rear end of the mounting bolt, and the front end and the rear end of the mounting bolt are formed in the through hole. A first hollow cylindrical body is provided with a water sealing means on the inner circumferential surface of the tip part and is slidable along the through hole, and this first hollow cylindrical body is attached to the back side of the mold copper plate via the water sealing means at the tip part. A second hollow cylindrical body is provided that engages with the first coil to be pressed and the rear end of the first coil and is screwed and fixed within the through hole, and further includes a first hollow cylindrical body, the first coil and the second Inside the hollow cylindrical body of No. 2, there is a first
A holder that is compatible with the water sealing means on the inner circumferential surface of the tip of the hollow cylindrical body and is movable together with the first hollow cylindrical body, a second coil that supports this holder, and a rear end of the second coil that engages with the water sealing means. A temperature measurement device for a continuous casting mold, characterized in that a thermocouple introduction tube is provided with a second hollow cylindrical body and fixed with a screw, and the thermocouple fixedly held in the holder is disposed through the introduction tube. .