RU162918U1 - DEVICE FOR MEASURING PHYSICAL AND CHEMICAL PARAMETERS AND MELT METAL SAMPLING - Google Patents

Abstract

1. A device for the simultaneous measurement of one or more physico-chemical parameters and sampling of the molten metal after preliminary measurement of the temperature in the molten metal bath, including: - a first measuring head (10) with a heat-sensitive element (11), which is protected by a first protective cap (12 ) enclosed in a first body (13) of refractory material and surrounded by a first hollow shell (14) of refractory material; - a second measuring head (20) with one or more sensors (21), which protected by a second protective cap (22) and designed to measure one or more physico-chemical parameters of the molten liquid metal, enclosed in a second body (23) of refractory material, which is also equipped with a sampling chamber (25) and surrounded by a second hollow shell (24) from refractory material: - a third hollow shell (34 ′) of refractory material, which covers the first and second measuring heads (10) and (20), sequentially located and connected to each other; characterized in that it includes a fourth and fifth hollow shells (44) and (54) of refractory material arranged sequentially around the third hollow shell (34 ′); the fourth shell (44) is located at the level of the first measuring head (10), the fifth hollow shell (54) is located at the level of the second measuring head (20), and the gap (45) between the fourth and fifth hollow shells (44) and (54 ) is located at the level of the second metal cap (22) .2. The device according to claim 1, wherein the thickness of the third hollow shell (34 ′) is less than the thickness of the first, second, fourth and fifth shells (14), (24), (44) and (54). 3. The device according to claim 1, wherein the first, second, third, fourth and fifth floor

Description

The technical field to which the present utility model relates.

This utility model relates to the field of ferrous metallurgy and, in particular, to a device that can be used to control the technological parameters of the molten metal, in particular, for simultaneous measurement of physicochemical parameters / parameter and sampling of the molten metal.

State of the art

Conventional devices for measuring temperature and sampling molten metal are described in the prior art. US-A-4069715 discloses a device that includes: a handle made in the form of a hollow cardboard tube; sampler; and a thermosensitive element made in the form of a thermocouple. The sampler and thermocouple are enclosed in cardboard tubes that are fastened to each other by their sides. The sampler and thermocouple are replaceable elements; the handle is inserted into one of the tubes and connected to it. The specified device allows you to simultaneously take a sample of liquid metal and measure the temperature in the bath of molten metal. Another device for measuring temperature and sampling molten metal is described in US-A-4361053. This device includes a housing, which consists of two sections rigidly fastened to each other; two metal plates defining a sampling chamber, which is located between these sections of the housing; and elements forming the entrance to the chamber. Such a device allows you to simultaneously take a sample of liquid metal and measure the temperature in the bath of molten metal. US-A-5577841, which corresponds to RU-C2-2155948, discloses a device for measuring temperature and sampling molten metal, comprising a removable unit with a shell of refractory material, such as a laminated cardboard impregnated with a refractory composition. Housing made of refractory -2-

material formed by two sections rigidly interconnected, is fixed in the shell on one side only. One of the sections contains a sampling chamber with an element forming the entrance to the specified chamber. This device contains two thermosensitive elements made in the form of thermocouples. One of these thermocouples is fixed in the first section of the housing using refractory material, for example, refractory cement. The thermocouple leads extend beyond the end of the casing from the refractory material and are configured to measure the temperature in the molten metal bath. The findings of another thermocouple are placed in the sampling chamber of the first section and are configured to determine the temperature of the molten metal in the liquid phase during its curing. The second section of the housing contains a clamp, which is a contact node of a non-conductive material, such as plastic. The clamp is pressed into the second section of the housing in order to secure the thermocouples. The element forming the inlet of the sampling chamber and the thermocouple extending from the refractory material beyond the end of the casing are closed with a common metal cap. Another metal cap covers the element forming the inlet of the sampling chamber. Thermocouple leads are shielded by thin-walled quartz tubes. The top of the device for measuring temperature and sampling is covered by a paper cap.

All three devices of the prior art have the disadvantage that, if it is necessary to conduct a preliminary temperature measurement in the molten metal bath, the removable unit must be replaced with a new one. This operation requires additional time; while the operator must perform certain manipulations, which are usually performed in a very aggressive environment.

Another prior art device described in patent RU-U1-34011 is characterized by a simplified structure; in this case, before taking a sample with simultaneous measurement of the temperature of the liquid metal, it is necessary to conduct a preliminary measurement of the temperature in the bath of molten metal. This document describes a device for measuring temperature and sampling molten metal, which contains a replaceable unit, characterized by the presence of a shell made of refractory material, in which a housing made of refractory material with a sampling chamber and a first heat-sensitive element is fixed. Sampling chamber and first -3-

the thermosensitive element is closed by the first metal cap. This device also contains a second heat-sensitive element and a second metal cap, as well as an additional hollow shell of refractory material with a housing made of refractory material located in it. The second heat-sensitive element is placed in an additional housing and is closed by a second metal cap. Hollow shells are mounted in series and connected to each other, and there is a recess on the outside of the additional hollow shell.

Before taking the measurement, the device is connected to the contact holder, which is fixed in a metal rod; in this case, the metal rod itself is placed in a device for measuring the characteristics of the melt, which immerses the specified rod in the bath of molten metal. First, a preliminary measurement of the temperature of the molten metal is carried out. This is necessary for subsequent adjustment of the characteristics of the melting. The findings of the lower thermocouple are protected from slag when passing through its layer. As the device penetrates into the molten metal, the metal cap of the thermocouple melts, and the thermocouple begins to determine the temperature in the bath of molten metal. The signal from the thermocouple is transmitted to the recorders. Preliminary temperature measurements last 4-6 seconds. During this time, the hollow shell burns through the annular groove, and after removing the core, part of the shell with the lower heat-sensitive element breaks off along the annular groove and subsequently burns.

Machining a recess on the surface of an additional hollow shell is a time-consuming and expensive operation. In addition, to prevent premature ignition of the additional hollow shell, it is necessary to impregnate it with a refractory composition (refractory silicate is usually used). This operation is also expensive and time consuming, and also requires a lot of free space so that the impregnated shells can dry. Thus, it would be advisable to create a device that could be used to simultaneously measure the temperature and take a sample of the molten metal with a preliminary measurement of the temperature in the bath of molten metal.

The purpose of this utility model is to create such a device.

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Brief disclosure of this utility model

According to this utility model, a device for simultaneously measuring one or more physicochemical parameters and taking a sample of molten metal after a preliminary temperature measurement in a bath of molten metal includes the following elements:

- a first measuring head with a heat-sensitive element protected by a first protective cap, enclosed in a first body of refractory material and surrounded by a first hollow shell of refractory material;

- a second measuring head with one or more sensors, protected by a second protective cap and designed to measure one or more physico-chemical parameters of the molten liquid metal, enclosed in a second body of refractory material and surrounded by a second hollow shell of refractory material; wherein the second body of refractory material is also provided with a sampling chamber and is surrounded by a second hollow shell of refractory material;

- a third hollow shell of refractory material, which covers the first and second measuring heads, sequentially located and connected to each other;

- the fourth and fifth hollow shells of refractory material arranged sequentially around the third hollow shell; the fourth shell is located at the level of the first measuring head, the fifth hollow shell is located at the level of the second measuring head, and the gap between the fourth and fifth hollow shells is located at the level of the second metal cap.

A device for preliminary temperature measurement in a bath of molten metal with subsequent sampling simultaneously with the measurement of one or more physicochemical parameters of the molten liquid metal according to the present invention has a simplified design in comparison with the prior art device. Moreover, it is simpler and cheaper to manufacture, and also requires fewer operations.

Both measuring heads are protected from slag and molten metal during the operations of the fourth and fifth hollow shells of refractory material. They may also be coated or impregnated with a refractory composition, but -5-

by choosing the appropriate thickness of the fourth and fifth shells, this subsequent stage can be avoided and, accordingly, costs can be reduced. Since the fourth and fifth shells do not have to cover the head along its entire length, unnecessary costs due to the excessive thickness of the shells can be avoided.

The gap between the fourth and fifth hollow shells leaves the third hollow shell unprotected at the level of the second metal cap. As a result, the third hollow shell burns through at the level of this gap during preliminary temperature measurement in the molten metal bath, and after removing the tuyeres, part of the third shell with the first measuring head breaks off and subsequently burns. Due to the proper choice of the thickness of the third hollow shell, it is possible to determine the time required for its complete through burning. This has already been achieved in the prior art apparatus by determining the depth of the undercut. However, according to the present utility model, the accuracy of determining the remaining thickness is significantly improved, and therefore, the indicated time can be set with greater accuracy.

According to a most preferred embodiment of the present utility model, the first, second, third, fourth and fifth hollow shells are made of cardboard.

According to preferred embodiments of the present utility model, the second measuring head comprises:

- a thermosensitive element and a sampling chamber;

- a thermosensitive element, a sensor of thermodynamic activity of oxygen and a sampling chamber;

- a sensor of thermodynamic activity of oxygen and a sampling chamber, or

- a sensor for instant determination of carbon content by the method of thermal analysis of a hardening metal sample, a sensor for the thermodynamic activity of oxygen and a sampling chamber.

It should be noted that the inlet of the sampling chamber can be located in the axial direction of the measuring lance or in the transverse direction.

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Brief Description of the Figures

The device according to the present invention is illustrated in the accompanying drawings:

In FIG. 1 shows a cross-section of a device for measuring temperature and sampling molten metal (after preliminary measuring the temperature in a bath of molten metal) of the prior art according to patent RU-U1-34011;

In FIG. 2 shows a cross-section of a device for measuring temperature and sampling molten metal (after preliminary measuring the temperature in a bath of molten metal) according to the present utility model; but

In FIG. Figure 3 shows a cross-section of a device according to the present utility model, which is intended for instant determination of carbon content by thermal analysis of a hardened metal sample, measurement of the thermodynamic activity of oxygen and sampling of molten metal (after preliminary measurement of temperature in the molten metal bath).

Detailed disclosure of a true utility model

Both devices in paragraphs. 1 and 2 are intended for simultaneous measurement of one or several physicochemical parameters and sampling of molten metal after preliminary measurement of temperature in the bath of molten metal. In both cases, the described device includes the following elements:

- the first measuring head (10) with a heat-sensitive element (11), which is protected by a first protective cap (12), enclosed in a first housing (13) made of refractory material and surrounded by a first hollow shell (14) made of refractory material (for example, multilayer cardboard );

- a second measuring head (20) with a heat-sensitive element (21), which is protected by a second protective cap (22), enclosed in a second body (23) of refractory material, which is also equipped with a sampling chamber (25), and surrounded by a second hollow shell (24) ) from refractory material;

- a third hollow shell (34) or (34 ′) of refractory material, which covers the first and second measuring heads (10) and (20), sequentially -7-

located and connected to each other.

In the prior art apparatus illustrated in FIG. 1, the third hollow shell (34) is provided with a recess (35) at the level of the second metal cap (22).

In the device according to the present utility model illustrated in FIG. 2, the third hollow shell (34 ′) is not provided with a recess so difficult to manufacture. Instead, the fourth hollow shell (34 ′) is sequentially covered by the fourth and fifth hollow shells (44) and (54) of refractory material; the fourth hollow shell (44) is located at the level of the first measuring head (10), the fifth hollow shell (54) is located at the level of the second measuring head (20), and the gap between the fourth hollow shell (44) and the fifth hollow shell (54) located at the level of the second metal cap (22).

In the specific embodiment shown in FIG. 1 and 2, the sixth and seventh hollow shells (64) and (74) of refractory material are arranged sequentially between the third hollow shell (34 ′) and, respectively, the first and second hollow shells (14) and (24). The seventh hollow shell (74) allows you to better hold the measuring head (20) during the second measurement.

Upon completion of the preliminary temperature measurement, the characteristics of the melting of the liquid metal are adjusted, after which the device is once again immersed in the bath with molten metal for 4-6 seconds; however, there is no need to perform any additional operations between the indicated stages. The thermocouple leads are protected by a metal cap (22) as they pass through the slag layer. As the device is immersed in molten metal, the metal cap (22) protecting the inlet of the sampling chamber (25) and the thermocouple sensor (21) gradually melts. The molten metal under ferrostatic pressure enters the sampling chamber (25) and fills it. Air is displaced from the sampling chamber (25) through a recess or ventilation hole. Thermocouple (21) determines the temperature in the bath of molten metal to confirm the accuracy of the corrected characteristics of the molten metal.

In FIG. 3 shows a device according to another embodiment of the present invention, which is also intended for simultaneous measurement of one or more physico-chemical parameters and sampling of the melt after preliminary measurement of temperature in the bath -8-

molten metal. This device contains the following items:

- the first measuring head (10) with a heat-sensitive element (11), which is protected by a first protective cap (12), enclosed in a first housing (13) made of refractory material and surrounded by a first hollow shell (14) made of refractory material (for example, multilayer cardboard );

- a second measuring head (20 ′) with a sensor (26) for measuring the thermodynamic activity of oxygen, which is protected by a second protective cap (22), enclosed in a second body (23) of refractory material, which is also equipped with a sampling chamber (25), and surrounded by a second a hollow shell (24) of refractory material, and also equipped with a sensor (27) for instantly determining the carbon content by thermal analysis of a hardened metal sample. As can be seen in FIG. 3, which illustrates one specific embodiment of the present invention, the common input (28) of the sampling chamber (25) and the sensor (27) for determining the carbon content goes in a direction perpendicular to the longitudinal axis of the lance. It should be noted that the common input can also be located on the tip of the measuring head (20 ′) near the lower end of the sensor (26) for measuring the thermodynamic activity of oxygen;

- a third hollow shell (34 ′) of refractory material, covering the first and second measuring heads (10) and (20 ′), sequentially located and connected to each other;

- the fourth and fifth hollow shells (44) and (54) of refractory material, sequentially covering the third hollow shell (34 ′); the fourth hollow shell (44) is located at the level of the first measuring head (10), the fifth hollow shell (54) is located at the level of the second measuring head (20), and the gap (45) is between the fourth and fifth hollow shells (44) and (54) at the level of the second metal cap (22);

- the sixth and seventh hollow shells (64) and (74) of refractory material located sequentially between the third hollow shell (34 ′) and, respectively, the first hollow shell (14) and the second hollow shell (24). The seventh hollow shell (74) allows better holding of the measuring head (20 ′) during the second measurement.

With this device, according to the present utility model, the thickness of the third hollow shell (34 ′) is less than the thickness of the first, second, fourth and fifth shells -9-

(14), (24), (44) and (54).

Thus, the device according to the present utility model makes it possible to perform a preliminary measurement of the temperature in the molten metal bath in order to subsequently adjust the characteristics of the molten metal. In addition, sampling and measuring the temperature of the molten metal can be carried out without the need for any additional operations.

Claims (8)

1. A device for the simultaneous measurement of one or more physico-chemical parameters and sampling of the molten metal after preliminary measurement of the temperature in the bath of molten metal, including: - a first measuring head (10) with a heat-sensitive element (11), which is protected by a first protective cap (12), enclosed in a first body (13) of refractory material and surrounded by a first hollow shell (14) of refractory material; - a second measuring head (20) with one or more sensors (21), which are protected by a second protective cap (22) and are designed to measure one or more physico-chemical parameters of the molten liquid metal, enclosed in a second body (23) of refractory material, which is also equipped with a sampling chamber (25), and surrounded by a second hollow shell (24) of refractory material: - a third hollow shell (34 ′) of refractory material, which covers the first and second measuring heads (10) and (20), sequentially located and connected to each other; characterized in that it includes - the fourth and fifth hollow shells (44) and (54) of refractory material arranged sequentially around the third hollow shell (34 ′); the fourth shell (44) is located at the level of the first measuring head (10), the fifth hollow shell (54) is located at the level of the second measuring head (20), and the gap (45) between the fourth and fifth hollow shells (44) and (54 ) is located at the level of the second metal cap (22). 2. The device according to claim 1, wherein the thickness of the third hollow shell (34 ′) is less than the thickness of the first, second, fourth and fifth shells (14), (24), (44) and (54). 3. The device according to claim 1, wherein the first, second, third, fourth and fifth hollow shells (14), (24), (34 ′), (44) and (54) are made of cardboard. 4. The device according to claim 3, wherein the first, second, third, fourth and fifth hollow shells (14), (24), (34 ′), (44) and (54) are made of multilayer cardboard. 5. The device according to claim 1, wherein said device is provided with a sixth (64) and seventh (74) hollow shells of refractory material, which are arranged sequentially one after another between the third hollow shell (34 ′) and, accordingly, the first hollow shell ( 14) and a second hollow shell (24). 6. The device according to claim 5, wherein the sixth and seventh hollow shells (64) and (74) are made of cardboard. 7. The device according to claim 3, wherein the sixth and seventh hollow shells (64) and (74) are made of multilayer cardboard. 8. The device according to any one of paragraphs. 1-7, and the second measuring head (20) contains: a thermosensitive element (21) and a sampling chamber (25); a thermosensitive element (21), a sensor of thermodynamic activity of oxygen and a sampling chamber (25); oxygen thermodynamic activity sensor and sampling chamber (25); or a sensor (27) for instantly determining the carbon content by thermal analysis of a hardening metal sample, a thermodynamic oxygen activity sensor (26) and a sampling chamber (25).

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