SU1695166A1 - Sampling device for melted metal - Google Patents

Abstract

The invention relates to metallurgy. The purpose of the invention is to increase the operational reliability and quality of the molten metal sample. When the retainer made of a low-melting material is melted, the sampling container in the form of a glass of refractory material, mounted on the retainer at the lower edge of the sampling window, is lowered onto the upper end of the plug covering the central opening of the housing from below. Through the open sampling window, the melt flows into the glass, the height of which is not less than the height of the sampling window. The extraction of the sample occurs by knocking it out through the hole with the help of a plug, the distance from the upper end of which to the fixer is chosen to be no more than the height of the glass. 1 il.

Description

cl

with

This invention relates to metallurgy, and more specifically to devices for sampling. liquid or fluid state, and can be used in metallurgical plants for sampling of molten metal, such as nickel-based heat-resistant alloys, produced in vacuum induction furnaces.

A device for sampling a liquid metal is known, comprising a housing with a lid fitted with a spring-loaded stem, the lid having the shape of the inner surface of the housing.

The disadvantages of this design are the need to transfer a sample of the melt into a special form, limited use of the device when taking, samples of the molten metal from the crucibles of a vacuum induction furnace, and the possibility of slag entering the body cavity.

Closest to the invention is a device for taking a sample of molten metal, comprising a housing with a sampling tank and a sampling hole coaxially located in a protective cup with a spring-loaded pusher, the housing and the cup being made with through holes arranged perpendicular to the vertical axis of the apparatus above the sampling tube container, made in the form of a glass of refractory material and installed on the lock, and the height of the glass must be at least the height of the sampling KPA and the distance between the upper end plug and latch - not more than height of cup.

The essential features distinguishing the invention from the prototype are: supplying the body with a central hole, closed from the bottom with a plug, inside which the sampling tank is located;

o you ate

( about

the implementation of the sampling tank in the form of a glass of refractory material; placing the sampling container on the lock at the level of the lower edge of the sampling window; the execution of the glass is not less than the height of the sampling window; selection of the distance between the upper end of the cap and the lock no more than the height of the glass

Supplying the housing with a central hole, closed at the bottom by a plug, inside which the sampling container is located, contributes to its reliable movement downwards when the low-melting clamp is melted due to different coefficients of thermal expansion of the material of the housing and glass. In addition, the possibility of slag falling on the melt surface is excluded, since before the fusible latch is melted, the sampling window is completely blocked by the sampling cup, the side walls of which are tightly attached to the inner wall of the housing.

The execution of the sampling tank in the form of a glass of refractory material eliminates the welding of the sampling tank to the device; Removing the sample from the device is greatly simplified when the glass made of refractory material is destroyed by mechanical means due to the significant difference in the internal diameter of the housing and the size of the sample. In addition, by reducing the shrinkage shell and the high resistance of the refractory material in comparison with the material of the body, the quality of the sample is improved.

Placing the sampling container on the retainer at the level of the lower edge of the sampling window ensures that it is held in a position that completely overlaps the sampling window, and when a low-melting clamp is melted, the glass is lowered to the upper end of the plug. not containing slags.

Making the cup no less than the height of the sampling window ensures tight closure of the sampling window in the initial position, eliminating slag penetration into the npoby and flowing of the melt on the upper end of the plug.

The choice of the distance between the upper end of the plug and the lock no more than the height of the glass ensures complete removal of the melt located above the level of the capacity of the glass through the sampling window when lifting the device. In addition, the crystallization of metal residues on the

the walls of the central hole below the bottom edge of the sampling window, i.e. improved reliability of sample extraction from the device.

Thus, an increase in the operational reliability and an increase in the quality of the molten metal sample is achieved.

In the proposed device a glass of

0 refractory material in conjunction with other signs simultaneously performs the function 3ai of the thief of the sampling window and the sampling container.

The drawing shows the device, on 5 perechny incision.

The molten metal sampling device comprises a housing 1 provided with a central through hole 2 and a sampling window 3. Inside the central through hole 2 there is a sampling container 4, made in the form of a cup of refractory material, the internal cavity of which can be of different configuration Glass 4 is installed

5 at the level of the lower edge of the sampling window 3 on the latch 5 made of a low-melting material and located perpendicular to the vertical axis of the device. The latch 5 is mounted in the grooves 6 and for

0 protection against pouring with liquid metal is coated with refractory clay. The height of the glass 4 must be at least the height of the sampling window 3. In the lower part, the central through hole 2 is closed

5 with a plug 7, the upper end of which is placed from the fixer 5 at a distance not exceeding the height of the glass. In the upper part, a lifting mechanism 8 is attached to the housing 1,

Position 9 in the drawing is marked ti0 gel with molten metal.

The device works as follows.

The assembled device is lowered into the crucible 9 of a vacuum induction furnace.

5 so that sampling window 3 is below the level of slag metal. Under the action of high temperatures, the latch 5 melts, resulting in the glass 4 under the action of its own weight

0 slides along the wall of the central opening 2, lowers to the upper end of the plug 7. At that, the sampling window 3 opens completely through which the molten metal flows into the sampling chamber 5. After filling, the device rises upwards using the lifting mechanism 8.

The excess metal, which is above the level of the glass 4, flows through the sampling window 3 into the crucible 9. The melt-raised device is cooled in vacuum and then in air. After that, the cup 4 with the sample is removed from the device by knocking it out with the help of the plug 7 through the central hole 2. When the glass of refractory material is destroyed mechanically, it is possible to remove the sample from the device through the sampling window 3. Next, the plug 7 is tightly installed into the central hole 2 of the housing 1 A retainer 5 is inserted into the grooves 6 and plastered with refractory clay. Next, a new sample cup is installed on the retainer. The device is again ready for operation.

Technical and economic advantages of the proposed device in comparison with the prototype are due to the greatest reliability of the device operation when it is used multiple times for sampling of heat-resistant nickel-based vacuum alloys, as well as due to obtaining samples with a more complex geometry and better surface quality due to -

Claims (1)

the possibility of contaminating the sample with slag and other inclusions; claims An apparatus for sampling molten metal, comprising a housing with a sampling container and a sampling window, a fixture made of a low-melting material and placed perpendicular to the axis of the device, characterized in that in order to increase operational reliability and improve the quality of the molten metal sample, the casing is made with a vertical axial bore, fitted with a plug placed in the lower part of the casing, The detector is installed at the level of the lower edge of the sampling window, and the sampling container is made in the form of a glass of refractory material and is installed on the retainer, the glass height must not be less than the height of the sampling window, and the distance between the upper end of the cap and the retainer - not more than glasses.