1. The utility model provides a package and crystallizer steel-sediment normal position sampling device in middle of continuous casting process, its characterized in that, including the bottom plate and with the bottom plate vertical fixation's carry-draw stick, still include detachable cover locate carry-draw stick outside cavity body, the bottom plate can seal from the bottom the cavity part of cavity body, carry-draw stick be used for with the bottom plate hangs below steel-sediment interface, cavity body be used for descend to with the bottom plate contact and with steel-sediment normal position sample encapsulation in the cavity body, carry-draw stick still be used for carrying out and encapsulating the steel-sediment the cavity body, but cavity body utilizes broken material to make, can take out after will the cavity body is broken steel-sediment normal position sample.

2. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 1, wherein the bottom plate is a circular bottom plate.

3. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 1, wherein the bottom plate is a pure iron bottom plate.

4. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 1, wherein the pulling rod is a pure iron pulling rod.

5. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 1, wherein the pulling rod is fixed at a central position of the bottom plate.

6. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 1, wherein the hollow tube body is a high temperature resistant quartz hollow tube body.

7. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 1, wherein the hollow tube body has an outer diameter of 30mm to 50mm, a wall thickness of 2mm to 3mm, and a height of 800mm to 1500 mm.

8. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 1, wherein the length of the pulling rod is 1300mm to 2000mm, and the diameter is 8mm to 10 mm.

9. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device of claim 2, wherein the bottom plate has a diameter of 60mm to 100mm and a thickness of 12mm to 15 mm.

10. The continuous casting process tundish and crystallizer steel-slag in-situ sampling device according to any one of claims 1-9, wherein the bottom plate and the pull rod are fixed by welding.

Background

In the continuous casting process, tundish slag and crystallizer casting slag have important metallurgical functions, wherein the first aspect is air isolation to avoid secondary oxidation of molten steel due to air contact, the second aspect is heat preservation to reduce the temperature drop of the molten steel, and the third aspect is adsorption to remove impurities floating in the molten steel and improve the purity of the molten steel.

Referring to FIG. 1, FIG. 1 is a schematic view of a molten steel and a liquid slag layer, showing a molten steel 101 below and a liquid slag layer 102 above, with a steel-slag interface 103 therebetween, and further showing a direction 104 perpendicular to the steel-slag interface in FIG. 1. In the continuous casting process, the whole composition and the physical and chemical properties of the liquid slag layer are changed along with the progress of the steel-slag interface reaction, and meanwhile, the composition and the physical and chemical properties of steel and slag in the direction 104 vertical to the steel-slag interface are caused to have certain difference. If the change law of the physical and chemical properties of the molten steel and the liquid slag layer in the steel-slag interface area in the continuous casting process, especially the physical and chemical properties of the molten steel or the liquid slag layer in the direction perpendicular to the steel-slag interface area, needs to be systematically and accurately represented, and the physical and chemical properties are taken as important bases for evaluating the metallurgical effect of the molten slag and optimizing the slag components, the steel-slag in the continuous casting process needs to be sampled in situ.

The existing sampling methods mainly include two types, the first type is as shown in fig. 2, fig. 2 is a schematic diagram of the first type, a sampler a is placed in the steel-slag, as shown by three arrows at the upper part of the sampler a in the drawing, the liquid steel-slag naturally mixes and flows into the sampler a, and the sampling result is as shown at the right side of fig. 2, and slag drops are scattered in the molten steel; secondly, as shown in fig. 3, fig. 3 is a schematic diagram of a second conventional sampling manner, in which the inner cavity of the sampler B is in a vacuum state or a low-pressure state, and the pressure P2 inside the sampler B is less than the atmospheric pressure P1, so that after the sampler B is placed in the steel-slag system, the liquid steel-slag is driven to be sucked into the inner cavity of the sampler B by using the pressure difference between the atmospheric pressure P1 and the pressure P2 in the inner cavity of the sampler B, as shown by three arrows at the lower part of the sampler B, and the final result is shown at the right side of fig. 3, where slag droplets are also scattered in the molten steel. However, these sampling methods have their own drawbacks, and specifically, the liquid steel-slag must be mixed when flowing into the sampler, so that the obtained samples are all in a steel-slag mixed state, it is difficult to obtain the steel-slag samples in an original state in the vertical direction of the steel-slag interface, in-situ observation and analysis cannot be performed on the samples at different positions in the vertical direction of the steel-slag interface, and most of the sampling devices have complicated structures, which also increases the installation difficulty and sampling cost in the production process.

Disclosure of Invention

In order to solve the problems, the invention provides a tundish and crystallizer steel-slag in-situ sampling device in a continuous casting process, which can obtain an original-state steel-slag sample in the vertical direction of a steel-slag interface, is convenient for carrying out in-situ observation and analysis on samples at different positions along the vertical direction of the steel-slag interface, and has the advantages of simpler structure, low installation difficulty and lower cost.

The invention provides a steel-slag in-situ sampling device for a tundish and a crystallizer in a continuous casting process, which comprises a bottom plate, a pulling rod and a hollow pipe body, wherein the pulling rod is vertically fixed with the bottom plate, the hollow pipe body is detachably sleeved outside the pulling rod, the bottom plate can seal the hollow part of the hollow pipe body from the bottom, the pulling rod is used for suspending the bottom plate below a steel-slag interface, the hollow pipe body is used for descending to be in contact with the bottom plate and packaging a steel-slag in-situ sample in the hollow pipe body, the pulling rod is also used for pulling the hollow pipe body packaged with the steel-slag, the hollow pipe body is made of a crushable material, and the steel-slag in-situ sample can be taken out after the hollow pipe body is crushed.

Preferably, in the continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the bottom plate is a circular bottom plate.

Preferably, in the continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the bottom plate is a pure iron bottom plate.

Preferably, in the continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the pulling rod is a pure iron pulling rod.

Preferably, in the continuous casting process tundish and the crystallizer steel-slag in-situ sampling device, the lifting rod is fixed at the central position of the bottom plate.

Preferably, in the tundish and the crystallizer steel-slag in-situ sampling device in the continuous casting process, the hollow pipe body is a high-temperature-resistant quartz hollow pipe body.

Preferably, in the continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the outer diameter of the hollow pipe body is 30mm to 50mm, the wall thickness is 2mm to 3mm, and the height is 800mm to 1500 mm.

Preferably, in the continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the length of the pulling rod is 1300mm to 2000mm, and the diameter of the pulling rod is 8mm to 10 mm.

Preferably, in the continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the diameter of the bottom plate is 60mm to 100mm, and the thickness of the bottom plate is 12mm to 15 mm.

Preferably, in the continuous casting process tundish and the crystallizer steel-slag in-situ sampling device, the bottom plate and the pull rod are fixed by welding.

As can be seen from the above description, the tundish and crystallizer steel-slag in-situ sampling device in the continuous casting process provided by the invention comprises the bottom plate, the lifting rod vertically fixed with the bottom plate, and the hollow tube detachably sleeved outside the lifting rod, wherein the bottom plate can seal the hollow part of the hollow tube from the bottom, the lifting rod is used for suspending the bottom plate below a steel-slag interface, the hollow tube is used for descending to contact with the bottom plate and packaging the steel-slag in-situ sample in the hollow tube, the lifting rod is also used for lifting the hollow tube packaged with the steel-slag, the hollow tube is made of a crushable material, and the steel-slag in-situ sample can be taken out after the hollow tube is crushed, so that the device can be used for obtaining the steel-slag sample in an original state in the vertical direction of the steel-slag interface, and is convenient for carrying out in-situ observation and analysis on samples at different positions in the vertical direction of the steel-slag interface, the structure is simpler, and the installation degree of difficulty is low, and the cost is lower.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view of molten steel and a liquid slag layer;

FIG. 2 is a schematic diagram of a first conventional sampling method;

FIG. 3 is a schematic diagram of a second conventional sampling method;

FIG. 4 is a schematic diagram of an embodiment of a tundish and a crystallizer steel-slag in-situ sampling device in a continuous casting process provided by the invention;

FIG. 5 is a schematic view of a bottom plate suspended below a steel-slag interface;

FIG. 6 is a schematic view of a process of lowering the hollow tubular body;

FIG. 7 is a schematic view of the hollow tube lowered into contact with the bottom plate;

FIG. 8 is a schematic diagram of the final form of the obtained steel-slag in-situ sample.

Detailed Description

The core of the invention is to provide a steel-slag in-situ sampling device for a tundish and a crystallizer in the continuous casting process, which can obtain an original-state steel-slag sample in the vertical direction of a steel-slag interface, is convenient for carrying out in-situ observation and analysis on samples at different positions along the vertical direction of the steel-slag interface, and has the advantages of simpler structure, low installation difficulty and lower cost.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of a tundish and a crystallizer steel-slag in-situ sampling device in a continuous casting process provided by the invention is shown in fig. 4, fig. 4 is a schematic diagram of an embodiment of a tundish and a crystallizer steel-slag in-situ sampling device in a continuous casting process provided by the invention, the device comprises a bottom plate 1 and a lifting rod 2 vertically fixed with the bottom plate 1, the two form a rod disc body, in addition, the device further comprises a hollow tube body 3 detachably sleeved outside the lifting rod 2, the bottom plate 1 can seal the hollow part of the hollow tube body 3 from the bottom, that is, when the lifting rod 2 is pulled upwards, the bottom plate 1 can be sealed with the hollow tube body 3, so as to ensure that steel-slag in the hollow tube body cannot leak out, specifically, the lifting rod 2 is used for suspending the bottom plate 1 below a steel-slag interface, as shown in fig. 5, fig. 5 is a schematic diagram for suspending the bottom plate below the steel-slag interface, the bottom plate 1 may be preferably located between 40cm and 60cm below the interface of steel and slag, so that the upper portion of the bottom plate 1 has both molten steel and molten slag, and as shown in fig. 6 and 7, fig. 6 is a schematic diagram of a descending process of the hollow tube, fig. 7 is a schematic diagram of the hollow tube descending to contact with the bottom plate, referring to a downward arrow in fig. 6, the hollow tube 3 is used for descending to contact with the bottom plate 1 and packaging the steel-slag in-situ sample in the hollow tube 3, and finally as shown in fig. 8, fig. 8 is a schematic diagram of a final form of the obtained steel-slag in-situ sample, so that the original form of the steel and slag can be kept unchanged, thereby performing better interface analysis, the pulling rod 2 is also used for pulling the hollow tube 3 packaged with the steel and slag, the steel and slag can be cooled and solidified after being pulled out, the hollow tube 3 is made of a crushable material, when the hollow pipe body 3 is crushed, a steel-slag in-situ sample can be taken, wherein the steel-slag in-situ sample comprises liquid slag 4 and molten steel 5 at the lower part as shown in figure 8.

As can be seen from the above description, in the embodiment of the steel-slag in-situ sampling device for the tundish and the crystallizer in the continuous casting process provided by the invention, the device comprises the bottom plate, the pulling rod vertically fixed with the bottom plate, and the hollow tube detachably sleeved outside the pulling rod, wherein the bottom plate can seal the hollow part of the hollow tube from the bottom, the pulling rod is used for suspending the bottom plate below a steel-slag interface, the hollow tube is used for descending to contact with the bottom plate and packaging the steel-slag in-situ sample in the hollow tube, the pulling rod is also used for pulling out the hollow tube packaged with the steel-slag, the hollow tube is made of a crushable material, and the steel-slag in-situ sample can be taken out after the hollow tube is crushed, so that the device can be used for taking the steel-slag sample in an original state in the vertical direction of the steel-slag interface, and is convenient for carrying out in-situ observation and analysis on samples at different positions in the vertical direction of the steel-slag interface, the structure is simpler, and the installation degree of difficulty is low, and the cost is lower.

In a specific embodiment of the above described continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the bottom plate 1 may preferably be a circular bottom plate, which can form a better fit with the cylindrical hollow tube 3, and also save materials, although other shapes such as rectangular or square may be selected according to actual needs, and is not limited herein.

In another embodiment of the continuous casting process tundish and crystallizer steel-slag in-situ sampling device, the bottom plate 1 may preferably be a pure iron bottom plate. It should be noted that the melting point of pure iron is higher than that of steel, and when the pure iron is immersed in the steel-slag solution for sampling in a short time, the pure iron bottom plate is not melted, and meanwhile, other elements cannot be brought into the pure iron bottom plate to pollute the molten steel, and other high-melting-point materials can be selected according to actual needs as long as the materials are not melted and cannot cause pollution.

In another embodiment of the above continuous casting tundish and crystallizer steel-slag in-situ sampling device, the pulling rod 2 may be preferably a pure iron pulling rod, which is not melted or has no impurities introduced, so as to have a better effect. The pull rod 2 can be fixed to the center of the bottom plate 1, and this arrangement is symmetrical and does not cause any inclination.

It will be appreciated by those skilled in the art that the hollow tube body 3 may preferably be a high temperature resistant quartz hollow tube body which can withstand a high temperature of 1450 degrees celsius for a short period of time and which can be readily broken to remove the in situ steel-slag sample therefrom. Further, the outer diameter of the hollow tubular body 3 may preferably be 30mm to 50mm, the wall thickness may preferably be 2mm to 3mm, and the height may preferably be 800mm to 1500 mm. In addition, the length of the pulling-up bar may preferably be 1300mm to 2000mm, the diameter may preferably be 8mm to 10mm, the diameter of the bottom plate may preferably be 60mm to 100mm, and the thickness may preferably be 12mm to 15 mm. The bottom plate and the lifting rod can be fixed in a preferable welding mode, so that the bottom plate and the lifting rod can be firmly fixed together, looseness cannot occur, and the sampling is more stable.

In conclusion, the device can realize in-situ sampling, observation, detection and analysis of molten steel and molten slag near a steel-slag interface in the production process, and provides powerful support for optimizing slag components, enhancing the stability and the impurity adsorption and removal capacity of the slag, and improving the purity of molten steel in a tundish and a crystallizer.

The application of the above-described device is illustrated below in two examples:

the first example is in-situ tundish steel-slag sampling during continuous casting:

(1) parameters of the sampling device: the diameter of the high-temperature resistant quartz tube is 40mm, the wall thickness is 3mm, the height is 1500mm, the length of the industrial pure iron rod is 2000mm, the diameter is 10mm, the diameter of the industrial pure iron thin plate disc is 80mm, the thickness is 15mm, and the industrial pure iron rod and the industrial pure iron bottom plate are connected into a whole by welding to form a rod disc body;

(2) the sampling method comprises the following steps:

the first step is as follows: immersing one end of a bottom plate of the rod plate body into a preset sampling position near a steel-slag interface of the tundish;

the second step is that: sleeving a high-temperature-resistant quartz tube outside the iron rod of the rod disc body, and slowly pushing the quartz tube downwards until the quartz tube is contacted with the bottom plate of the rod disc body for sealing;

the third step: and taking out the sampling device from the tundish, and crushing a quartz tube at the outer layer of the sample after the obtained steel-slag interface in-situ sample is cooled and solidified to obtain the obtained in-situ sample.

The second example is the in-situ sampling of the crystallizer steel-slag during continuous casting:

(1) parameters of the sampling device: the diameter of the high-temperature-resistant quartz tube is 30mm, the wall thickness is 2mm, the height is 800mm, the length of the industrial pure iron rod is 1300mm, the diameter is 8mm, the diameter of the industrial pure iron thin plate is 60mm, the thickness is 12mm, and the industrial pure iron rod and the industrial pure iron bottom plate are connected into a whole by welding to form the rod disk body.

(2) The sampling method comprises the following steps:

the first step is as follows: immersing one end of a bottom plate of the rod disc body into a preset sampling position near a steel-slag interface of the tundish;

the second step is that: sleeving a high-temperature-resistant quartz tube outside the iron rod of the rod disc body, and slowly pushing the quartz tube downwards until the quartz tube is contacted with the bottom plate of the rod disc body for sealing;

the third step: and taking out the sampler from the tundish, and crushing a quartz tube at the outer layer of the sample after the obtained steel-slag interface in-situ sample is cooled and solidified to obtain the obtained in-situ sample.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.