CN201062995Y - A temperature measuring device for continuously measuring the temperature of high temperature molten copper - Google Patents

Abstract

The utility model relates to a temperature measuring device for continuously measuring the temperature of high-temperature molten copper, in particular to a temperature measuring device for continuously measuring the temperature of molten copper in the copper alloy continuous casting process. The upper and lower protection tubes 3 are immersed in the copper liquid 12, the thermocouple 1 is located inside the upper protection tube, the thermocouple welding end 13 is located in the lower protection tube 3, the nickel-chromium wire 10 and the nickel-silicon wire 11 of the thermocouple 1 are respectively threaded with porcelain Asbestos rope 6 is filled between the inner side of the upper protective tube 5 and the thermocouple 1 of the casing 2, the welding end 13 of the thermocouple is placed in the lower protective tube 3 filled with mixed magnesia 4, and the free end 14 of the thermocouple is fixed with a fixed ceramic tube 7 On the upper protection tube 5 , the nickel-chromium wire 10 and the nickel-silicon wire 11 at the free end 14 of the thermocouple are respectively connected to the positive and negative poles of the smart meter 9 with the compensation wire 8 . The device has the advantages of simple structure, low price and long service life, can continuously measure the temperature of molten copper, and has accurate temperature measurement and high precision.

Description

A temperature measuring device for continuously measuring the temperature of high temperature molten copper

Technical field

The utility model relates to a temperature measuring device for continuously measuring the temperature of high-temperature copper liquid, in particular to a temperature measuring device for continuously measuring the temperature of copper liquid in the copper alloy continuous casting process.

Background technique

In the process of continuous casting of copper alloys, the temperature of molten copper is an extremely important process parameter. The temperature of molten copper is not only a key factor in determining the quality of casting rods, but also affects the power consumption of the product tonnage, the life of the electric furnace, and affects the production cost. Therefore, the copper liquid temperature automatic control system must be adopted to continuously and uninterruptedly measure and automatically adjust the temperature of the copper alloy in the continuous casting process to ensure that the temperature of the copper liquid is relatively stable, and the temperature measuring device is the temperature of the copper liquid during the continuous casting process. The key components in the automatic control system. For a long time, domestic steel processing enterprises have used different temperature measurement methods to conduct many experiments and explorations. A few enterprises use optical pyrometers and contact temperature measurement or consumption temperature measurement, which does not meet the actual conditions; some enterprises use metal protective sleeves and non-metallic protective sleeves such as quartz high-temperature ceramics, corundum, silicon carbide and other materials, but because the metal protective sleeve is not resistant to high temperature and corrosion, although the non-metallic protective sleeve is resistant to high temperature and corrosion, However, the mechanical strength is not high, and the thermal shock resistance is poor. The temperature measuring devices made are not suitable for medium and long-term temperature measurement of high-temperature copper liquid in power frequency induction continuous casting electric furnaces of 1100 ° C to 1280 ° C. Therefore, at present, domestic high-temperature copper Little progress has been made in the research of liquid continuous temperature measuring devices, and the detection level is still based on visual inspection and empirical operation, and it is impossible to talk about automatic control and adjustment.

Contents of the invention

The purpose of the utility model is to provide a temperature measuring device for continuously measuring the temperature of high-temperature molten copper with a wide range of temperature measurement, accurate temperature measurement, stable structure, not easy to damage, and low cost.

The technical scheme of the utility model is: the temperature measuring device for continuously measuring the temperature of high-temperature copper liquid consists of an upper protection tube made of copper tube, a lower protection tube made of graphite tube, a nickel-chromium-nickel-silicon thermocouple, an asbestos rope, a mixed Composed of magnesia, porcelain sleeve, fixed porcelain tube, compensation wire and intelligent instrument, the lower protective tube is tightly set on the upper protective tube, the lower protective tube is immersed in the copper liquid, the thermocouple is placed inside the upper protective tube, and its welding end is on the In the lower protective tube, and make the welding end of the thermocouple protrude from the end port of the upper protective tube connected with the lower protective tube for a certain length. Chromium wire and nickel-silicon wire are put on several porcelain sleeves from top to bottom in turn, asbestos rope is filled between the inner side of the upper protection tube and the thermocouple, and mixed magnesia is filled in the lower protection tube, so that the welding end of the thermocouple is fixed and buried in the mix In magnesia, and placed on the surface of the copper liquid for sintering for 5 to 10 minutes, the nickel-chromium wire and nickel-silicon wire at the free end of the thermocouple are fixed on the other end of the upper protection tube with a fixed porcelain tube, and then the nickel-chromium wire at the free end of the thermocouple is fixed with a compensation wire. The wire and the nickel-silicon wire are respectively connected to the positive and negative poles of the smart meter. After the lower part of the protection tube of the device is placed in the copper liquid for 10 minutes, a certain depth of copper in the furnace can be accurately read from the smart meter through the thermoelectric effect of the thermocouple. liquid temperature.

The utility model has the following advantages:

(1) Simple structure, strong and durable, easy to make;

(2) The temperature measurement is accurate, and the error is within ±5°C.

(3) The temperature measurement range is wide, from 0°C to 1280°C;

(4) The service life is long, and it can continuously measure the temperature in the copper liquid for more than one month;

(5) The temperature measuring device has strong shock resistance and anti-smoke and dust interference, so the accuracy of temperature measurement is guaranteed;

(6) The composition materials are common and the price is quite cheap.

The device can solve the key technical problems of the temperature measurement and automatic control system of the current power frequency induction copper melting furnace, guide the production process correctly, ensure product quality, increase the output of the electric furnace, reduce energy consumption, prolong the life of the furnace, and improve the economic benefits of production.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In Fig. 1, thermocouple 1, porcelain bushing 2, lower protective tube 3, mixed magnesia 4, upper protective tube 5, asbestos rope 6, fixed porcelain tube 7, compensation wire 8, intelligent instrument 9, nickel-chromium wire 10, Nickel silicon wire 11, copper liquid 12, thermocouple welding end 13, thermocouple free end 14.

Detailed ways

Below in conjunction with accompanying drawing, the utility model will be further described:

A temperature measuring device for continuously measuring the temperature of high-temperature molten copper shown in Fig. 1, consists of an upper protective tube 5 of a copper tube with an outer diameter of Φ17mm, a lower protective tube 3 of a graphite tube with an inner diameter of Φ17mm, a nickel-chromium-nickel-silicon thermocouple 1, Composed of porcelain sleeve 2, mixed magnesia 4, asbestos rope 6, fixed porcelain tube 7, compensation wire 8, and intelligent instrument 9, the porcelain sleeve 2 is worn on the nickel-chromium wire 10 and nickel-silicon wire 11 of the thermocouple 1, and the thermoelectric The couple 1 is placed in the upper protection tube 5, and the thermocouple welding end 13 protrudes 60-100 mm from one end of the upper protection tube 5, and the asbestos rope 6 is used as a pad between the thermocouple 1 and the inner surface of the upper protection tube 5, and attention should be paid to Try to prevent the thermocouple 1 from moving in the upper protection tube 5, put the lower protection tube 3 on the upper protection tube 5 in a tight fit, make the thermocouple welding end 13 be located in the lower protection tube 3, and make the thermocouple welding end 13 The distance from the bottom of the lower protective tube 3 is not less than 30 mm, and the lower protective tube 3 is filled with mixed magnesia 4 and filled so that the thermocouple welding end 13 located in the lower protective tube 3 is buried and fixed in the mixed magnesia 4, Place the lower part of the lower protective tube 3 on the surface of the copper liquid for 5-10 minutes to sinter the mixed magnesia, and the nickel-chromium wire 10 and the nickel-silicon wire 11 at the free end 14 of the thermocouple pass through two holes of the fixed porcelain tube 7 respectively, and By fixing the porcelain tube 7 on the upper protective tube 5, and connecting the nickel-chromium wire 10 and the nickel-silicon wire 11 at the free end 14 of the thermocouple with the positive and negative poles of the smart meter 9 with a compensation wire 8, a simple and practical A temperature measuring device that continuously measures the temperature of high-temperature copper liquid.

The lower protective tube 3 and the thermocouple welding end 13 of the device are placed in the copper liquid 12, and the actual temperature of the copper liquid at 50-90 mm below the liquid surface in the power frequency induction furnace can be measured through the thermoelectric effect of the thermocouple 1, and the temperature can be measured by The smart meter 9 is displayed, and the temperature measurement range is wide, from 0°C to 1280°C, accurate and reliable. After inserting the copper liquid for 10 minutes, the temperature difference between the measured temperature and the actual temperature of the copper liquid is ±5°C. It can be continuously inserted into the copper liquid to use one For more than a month, even if it is often taken out due to reasons such as changing product models or cleaning dust, the service life will not be reduced much, and the price is much lower than that of other materials and other structures.

Claims (2)

1. A temperature measuring device for continuously measuring the temperature of high-temperature molten copper, characterized in that: it comprises an upper protective tube (5) of copper tube or stainless steel tube material, a lower protective tube (3) of graphite tube material, nickel-chromium-nickel Silicon thermocouple (1), porcelain sleeve (2), mixed magnesia (4), asbestos rope (6), fixed porcelain tube (7), compensation wire (8), intelligent instrument (9), the lower protection The tube (3) is tightly sleeved on the upper protective tube (5), the lower protective tube (3) is immersed in the copper liquid (12), the thermocouple (1) is located inside the upper protective tube, and the thermocouple welding end (13) is located in the lower protective tube. Inside the tube (3), the nickel-chromium wire (10) and the nickel-silicon wire (11) of the thermocouple (1) are respectively threaded with a porcelain sleeve (2), and between the inner side of the upper protection tube (5) and the thermocouple (1) Fill the asbestos rope (6), place the thermocouple welding end (13) in the lower protection tube (3) filled with mixed magnesia (4), and fix the thermocouple free end (14) to the upper protection tube (7) On the tube (5), the nickel-chromium wire (10) and the nickel-silicon wire (11) of the thermocouple free end (14) are respectively connected to the positive and negative poles of the smart instrument (9) with a compensation wire (8). 2. A temperature measuring device for continuously measuring the temperature of high-temperature molten copper according to claim 1, characterized in that the distance between the thermocouple welding end (13) and the bottom end of the lower protection tube (3) is not less than 30 mm.

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