JPH07209094A - Device for measuring molten metal temperature - Google Patents

Abstract

PURPOSE:To eliminate troubles such as occupation of a heat-insulated tank due to the parallel arrangement of a vertical protecting tube with an earth bar, consumption of the earth bar by forming a vertical protecting tube of a thermocouple of the refractory material of conductor, and also using the protecting tube as the earth bar. CONSTITUTION:The upper end of a vertical protecting pipe 10 made of a refractory material of conductor, which is mainly composed of titanium boride, to a lower end of a hollow vertical pipe 5 made of conductor such as stainless steel through a connecting socket 7 made of stainless steel. This connection is carefully performed by screwing of the pipe 5 with the protecting pipe 10, fastening by a locking screw 15 made of stainless steel, insertion of Ni base paste 16 or the like so as to prevent the contact failure. A thermocouple element 19 coated with an insulating material 20 such as alumina is housed in the pipe 5 and the protecting pipe 10, and a connecting cord 4 is connected to the upper part of the pipe 5, and the vertical protecting pipe 10 is also used as the earth bar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the temperature of molten metal such as aluminum.

[0002]

2. Description of the Related Art Conventionally, thermocouples have been used to measure the temperature of molten metal in a furnace such as an aluminum automatic hot water supply furnace, an aluminum die cast casting furnace, or a surface level control furnace. 1 and 2 show an example of a known aluminum die casting casting furnace, in which a is a charging section for charging a molten aluminum and an ingot, b is a gas burner for melting the charged ingot, and c is a molten ingot. A damper that floats the oxide from the molten metal and allows only the molten metal to flow, d is a slit formed in the damper c, e is a heat retaining tank provided in the center, and f is heat retaining metal molten metal in the heat retaining tank e. The immersion heater, j is a pumping chamber, and a thermocouple h for measuring the temperature of the molten metal and a ground rod i for removing the charge are provided in the heat retaining tank e. The known thermocouple h has a shape in which the outer circumference of the element of the thermocouple for temperature measurement is surrounded by a non-conductor vertical protection tube such as silicon nitride, and the earth rod i for removing the charge is formed of a conductor and The protection tube h and the ground rod i were arranged in parallel at a desired interval.

[0003]

The above-mentioned known example is deficient in that the element of the thermocouple h housed in the vertical protection tube and the earth rod i for removing the charge are arranged in parallel at a desired interval. There is. Since the vertical protection tube and the ground rod i are provided side by side, the heat-retaining tank e, which is not so large, is occupied by the vertical protection tube and the ground rod i. Further, since the earth rod i is formed of a conductor, it is usually a metal rod such as stainless steel,
If this is directly immersed in the molten metal, there is a problem that it is severely damaged and is consumed in a short period of time. Therefore, in the present application, the vertical protective tube of the thermocouple is formed of a refractory material of a conductor to serve also as a ground rod, and the vertical protective tube and the ground rod are arranged side by side in terms of volume and short-term of the ground rod. This is to prevent the disadvantage of exhaustion. Further, in the present application, by forming the vertical protective tube with a refractory material of a conductor and also serving as a ground rod, the problem of contact failure that newly occurs is caused by Ni (nickel) base paste, stainless steel spring and stainless steel. It was overcome by the use of screws.

[0004]

Therefore, according to the present invention, titanium diboride or the like is connected to the lower end of the hollow vertical pipe 5 formed of a conductor such as stainless steel via the connection socket 7 formed of a conductor such as stainless steel. The lower end, which is the main component, is connected to the upper end of a vertical protective tube 10 of a conductor refractory material that is closed, and the hollow vertical pipe 5 and the vertical protective tube 10 except for the lower end are made of an insulating material 20 such as alumina. In the device which accommodates the thermocouple element 19 covered with, the earth protection cord 10 is connected to the upper part of the hollow vertical pipe 5 and the vertical protection pipe 10 also serves as an earth rod, A screw 6 is formed at the lower end and a screw hole 8 is formed at the upper part of the connection socket 7, respectively, and the lower end of the hollow vertical pipe 5 is screwed onto the upper part of the connection socket 7 to be fixed to the lower side of the connection socket 7. Insertion hole 1 Forming a cylindrical portion 13 having an upper end 1 of the vertical protection tube 10 by inserting the Ni-based paste 16 or stainless spring 17 in the insertion hole 12
1 is inserted, and a stainless set screw 15 is screwed from the outside of the cylindrical portion 13 to fix the vertical protective tube 10 to the metal melt temperature measuring device. Also,
According to the present invention, in the above apparatus, the temperature of the molten metal is measured by forming a recess 18 for fastening in the upper end 11 of the vertical protection tube 10 with which the tip of the stainless set screw 15 abuts.

[0005]

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 3 and subsequent figures, 1 is a closed head, and the head 1
The thermocouple connection terminals 3 and 3 are provided on the upper surface 2 of the. Reference numeral 4 is an earth connection cord taken out from the head 1. The upper end of a hollow vertical pipe 5 made of stainless steel is joined and fixed to the lower surface of the head 1. The earth connecting cord 4 is connected to an arbitrary position above the hollow vertical pipe 5.

A screw 6 is provided on the outer periphery of the lower end of the hollow vertical pipe 5.
Engrave. 7 is a connection socket made of stainless steel, and on the upper side of the stainless connection socket 7,
A screw hole 8 into which a screw 6 of the hollow vertical pipe 5 is screwed is formed, and the screw 6 of the hollow vertical pipe 5 is formed in the screw hole 8.
Screw on. Reference numeral 9 denotes a shelf portion to which a tip of the screw 6 of the hollow vertical pipe 5 is abutted when the screw 6 of the hollow vertical pipe 5 is screwed and tightened, and is formed at a vertically intermediate position of the connection socket 7.

An insertion hole 12 into which an upper end 11 of the vertical protection tube 10 is inserted from below is formed in the lower portion of the connection socket 7. Reference numeral 13 denotes a cylindrical portion which is the outer circumference of the insertion hole 12. A plurality of horizontal screw holes 14 are formed in the cylindrical portion 13, and stainless steel setscrews 15 are respectively screwed into the horizontal screw holes 14. When the set screw 15 is screwed, its tip projects into the insertion hole 12 and contacts the upper end 11 of the vertical protection tube 10.

The upper end 11 of the vertical protection tube 10 and the shelf 9
The Ni base paste 16 or the stainless spring 17 is interposed between the lower surface and the lower surface. The Ni base paste 16 or the stainless spring 17 is crushed between the upper end 11 of the vertical protection tube 10 and the lower surface of the shelf 9 and adheres to them, so that the hollow vertical pipe 5 and the vertical protection tube 1
0 is electrically connected. Reference numeral 18 denotes the stainless set screw 1 formed on the outer periphery of the upper end 11 of the vertical protection tube 10.
5 is a concave portion to which the tip end is engaged, and the screw 15 is mechanically connected without tightening too much, and the set socket 15 electrically connects the connection socket 7 and the vertical protective tube 10.

The vertical protective tube 10 has, for example, one or more of titanium diboride TiB2 and / or zirconium diboride ZrB2, cobalt Co, iron Fe, nickel Ni, and the balance is titanium carbonitride TiCN. It is made of ceramics and is a conductor, and has excellent contact resistance against molten metal such as aluminum. Conventionally known vertical protective tubes for thermocouples are non-conductors made of silicon nitride or the like, but in the present invention, a conductor ceramic is used.

A thermocouple element 19 is inserted inside the hollow vertical pipe 5 and the vertical protective pipe 10. The thermocouple element 19 is entirely surrounded by an insulating material (insulator material) 20 such as alumina except the lower end, and only the lower end is exposed portion 2.
1 is set. The thermocouple element 19 makes a U-turn at the exposed portion 21 and returns to the upper thermocouple connection terminal 3.

Therefore, according to the present invention, there is no conventionally known stainless steel earth rod i, and the vertical protection tube 10 also serves as the earth rod i. In addition, in FIG. 3 and FIG.
2 is a casting chamber for molten aluminum and ingot, 2
3 is a gas burner, 24 is a damper, 25 is a slit, 2
6 is a greenhouse, 27 is an immersion heater, 28 is a pumping chamber, and 29 is an apparatus for measuring the temperature of the molten metal having the above-mentioned configuration.

[0012]

[Operation] Next, the operation will be described. The aluminum ingot charged into the charging chamber 22 is melted by the gas burner 23, and the molten metal flows into the greenhouse 26 through the slit 25 of the damper 24 while leaving suspended matter. Since the vertical protection tube 10 having the thermocouple element 19 built therein is immersed in the molten metal in the greenhouse 26, the temperature is measured at the exposed portion 21 of the thermocouple element 19 in the vertical protection tube 10 and the thermoelectricity is measured. The temperature is displayed on a meter or the like connected via the connection terminal 3 for comparison. On the other hand, the immersion heater 27 is energized at that temperature to heat the molten metal in the greenhouse 26 to an appropriate temperature, and the molten metal is pumped out from the pumping chamber 28.

Therefore, according to the present invention, the vertical protection tube 10 is provided.
However, for example, it has titanium diboride TiB2 and / or zirconium diboride ZrB2, cobalt Co, iron Fe, nickel Ni, since the balance is made of ceramics formed of titanium carbonitride TiCN, It is a conductor and transmits the charge in the molten metal to the hollow stainless vertical pipe 5 through the stainless connection socket 7 and is grounded through the ground connection cord 4. Therefore, it is also used as a ground rod and does not require a separate ground rod i made of stainless steel, which is conventionally known.

Further, the hollow vertical pipe 5 made of stainless steel.
And the stainless steel connection socket 7, a screw 6 is formed on the lower end of the hollow vertical pipe 5, a screw hole 8 is formed in the upper half of the connection socket 7, and the screw 6 is inserted in the screw hole 8.
Since it is screwed by a method of screwing the
The mechanical and electrical connection between the connection socket 7 and the connection socket 7 is perfect, and the upper end 11 of the vertical protection tube 10 and the connection socket 7 are connected with the Ni base paste 16 or the stainless spring 17 interposed. Since the upper end 11 of the vertical protection pipe 10 is inserted into the tubular portion 13 of the connection socket 7 and then fixed by the stainless set screw 15, the hollow vertical pipe 5 and the vertical protection pipe 10 are machined. Completely electrical and electrical.

[0015]

The above-mentioned known example is defective in that the element of the thermocouple h housed in the vertical protection tube and the earth rod i for removing the electrostatic charge are arranged in parallel at a desired interval. Since the vertical protection tube and the ground rod i are provided side by side, the heat-retaining tank e, which is not so large, is occupied by the vertical protection tube and the ground rod i. Further, since the earth rod i is formed of a conductor, it is usually a metal rod such as stainless steel, and if it is directly immersed in the molten metal, it is severely damaged and has a defect that it is consumed in a short period of time.

However, according to the present invention, the lower end containing titanium diboride as a main component is connected to the lower end of the hollow vertical pipe 5 made of a conductor such as stainless steel via the connection socket 7 made of a conductor such as stainless steel. The upper end of a vertical protective tube 10 of a closed conductor refractory material is connected, and the hollow vertical pipe 5 and the vertical protective tube 10 are covered with an insulating material 20 such as alumina except for the lower end. In a device which accommodates the pair of elements 19 and connects the earth connection cord 4 to the upper portion of the hollow vertical pipe 5 to use the vertical protection pipe 10 also as an earth rod, the screw 6 is provided at the lower end of the hollow vertical pipe 5. Screw holes 8 are formed in the upper part of the connection sockets 7, respectively, and the lower ends of the hollow vertical pipes 5 are screwed onto the upper parts of the connection sockets 7 to fix them, and the insertion holes 12 are formed on the lower side of the connection sockets 7. Cylinder part 3 is formed, Ni in the insertion hole 12
After inserting the base paste 16 or the stainless spring 17, the upper end 11 of the vertical protection tube 10 is inserted, and the stainless set screw 1 is inserted from the outside of the cylindrical portion 13.
Since it is a device for measuring the temperature of the molten metal in which 5 is screwed and the vertical protection tube 10 is fixed,

The electrostatic charge in the molten metal is captured by the ceramic vertical protection tube 10, transmitted to the stainless hollow vertical pipe 5 through the stainless connection socket 7, and grounded through the ground connection cord 4. Therefore, the vertical protection tube 10 also serves as a conventionally known earth rod i, and eliminates a volume defect. Since the vertical protection tube 10 is made of ceramics, it is not damaged even when immersed in the molten metal. Since the screw 6 at the lower end of the hollow vertical pipe 5 is screwed into the screw hole 8 at the upper portion of the connection socket 7, the connection between the hollow vertical pipe 5 and the connection socket 7 is simple and reliable, and does not come off. Of course, the mechanical connection is also perfect. The Ni base paste 16 or the stainless spring 1 is inserted into the insertion hole 12 of the cylindrical portion 13 on the lower side of the connection socket 7.
7 is inserted and then the upper end 11 of the vertical protection tube 10 is inserted, and the stainless set screw 15
Since the vertical protection tube 10 is fixed by screwing, the connection socket 7 and the vertical protection tube 10 are not only electrically completely connected, but also mechanically completely connected. Further, in the present invention, the temperature of the molten metal is measured by forming a recess 18 for fastening in the upper end 11 of the vertical protection tube 10 with which the tip of the stainless set screw 15 abuts in the apparatus. The positioning is easy, and the setscrew 15 is joined without being tightened so strongly that the vertical protection tube 10 is not damaged by overtightening.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a known example of a die cast casting furnace.

FIG. 2 is a cross-sectional view of a known example of a die cast casting furnace.

FIG. 3 is a vertical sectional view of a die cast casting furnace of the present invention.

FIG. 4 is a cross-sectional view of a die cast casting furnace of the present invention.

FIG. 5 is a vertical cross-sectional view of a partly cutaway main part of the present invention.

FIG. 6 is an exploded vertical sectional view of a main part of the present invention.

FIG. 7 is a vertical cross-sectional view of a main part assembly of the present invention.

FIG. 8 is a second vertical cross-sectional view of main part assembly of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Head part, 2 ... Top surface, 3 ... Thermocouple connection terminal, 4 ... Ground connection cord, 5 ... Hollow vertical pipe, 6 ... Screw, 7 ... Connection socket, 8 ... Screw hole, 9 ... Shelf part, 10 ... Vertical protection tube, 1
DESCRIPTION OF SYMBOLS 1 ... Upper end, 12 ... Insertion hole, 13 ... Cylindrical part, 14 ... Side screw hole, 15 ... Set screw, 16 ... Ni base paste, 17 ...
Stainless steel spring, 18 ... Recess, 19 ... Thermocouple element, 20 ... Insulating material, 21 ... Exposed part, 22 ... Charge chamber, 23 ... Gas burner, 24 ... Damper, 25 ... Slit, 26 ... Greenhouse, 27 ... Immersion heater, 28 ... Pumping chamber, 29 ... Measuring device for molten metal temperature.

Claims (2)

[Claims] 1. A hollow vertical pipe 5 formed of a conductor such as stainless steel is closed at its lower end through a connection socket 7 formed of a conductor such as stainless steel, with a lower end composed mainly of titanium diboride or the like. A thermocouple element 19 is connected to the upper end of the vertical protective tube 10 of the refractory material of the conductor, and the hollow vertical pipe 5 and the vertical protective tube 10 are covered with an insulating material 20 such as alumina except for the lower end. In a device which is housed, and in which the vertical connecting pipe 4 is also used as a ground rod by connecting the earth connecting cord 4 to the upper portion of the hollow vertical pipe 5, a screw 6 is attached to the lower end of the hollow vertical pipe 5 of the connecting socket 7. A cylindrical portion 1 having screw holes 8 formed in the upper portion thereof, the lower end of the hollow vertical pipe 5 being screwed onto the upper portion of the connection socket 7 to be fixed thereto, and having an insertion hole 12 on the lower side of the connection socket 7.
3 is formed, the Ni base paste 16 or the stainless spring 17 is inserted into the insertion hole 12 of the tubular portion 13, and then the upper end 11 of the vertical protective tube 10 is inserted, and the stainless steel stopper is attached from the outside of the tubular portion 13. An apparatus for measuring a temperature of a molten metal, in which a screw 15 is screwed to fix the vertical protective tube 10. 2. The upper end 11 of the vertical protection tube 10 according to claim 1, wherein the tip of the stainless set screw 15 abuts.
For the measurement of the temperature of the molten metal in which the recess 18 for fastening was formed.