KR20090103244A - A sampler picker for hot metal probe - Google Patents

Abstract

PURPOSE: A sampling device for a hot metal probe is provided to improve analysis success yield by providing disk sample facilitating automated analysis. CONSTITUTION: A sampling device for a hot metal probe comprises a shell block, a sample collecting hole, and a temperature sensor. The shell block(100) is inserted into a housing protecting duct forming a probe and a part of the outer surface of the shell block is opened. The sample collecting hole(200) is built in the shell block and is made of a ceramic case and a cooling plate. The temperature sensor is eccentrically installed at the bottom surface of the shell block. The temperature sensor is protected by a sensor protective cap(112).

Description

Sampler for molten iron probe {A SAMPLER PICKER FOR HOT METAL PROBE}

The present invention relates to a sampler for a probe, and more particularly, for a molten metal probe, which is easy to collect molten metal, has good surface integrity of the sample, and has excellent component accuracy, and is easy to withdraw the sample. It relates to a sampler.

In general, a probe is a consumable measuring instrument used by being immersed in an electric furnace, a refining furnace, a ladle, or a Topedocar to obtain information of hot molten metal in a production process such as steel, nonferrous metal, or molten silicon. Usually, it is used in the form of equipped with an analytical measuring sensor or a sampler for analyzing the temperature and state of oxygen, carbon, silicon, etc. online.

In particular, the sampler is used to collect molten iron samples to accurately analyze the molten iron in the steelmaking process and the molten iron preliminary treatment process of steel mills.The sampler is controlled to produce molten steel products by controlling the molten metal through the feedback of the analyzed components. It is utilized to

In this process, the molten iron sample collected through the sampler is transferred to the analysis chamber and subjected to component analysis through pretreatment such as polishing the surface of the sample (usually 0.3 ~ 0.5mm) .In the analysis method, the time from sample preparation to analysis This relatively short, highly accurate fluorescence X-ray analysis (hereinafter referred to as 'X-Ray analysis') or emission spectrochemical analysis (hereinafter referred to as 'luminescence analysis') is mainly used.

In this case, luminescence analysis is most widely used because it is possible to analyze C (carbon), which is a main component of molten iron.

In this luminescence analysis, when the electrical energy such as Arc discharge is applied to the surface of the sample with Ø 6 ~ 9mm, evaporation and vaporization of the sample occurs. At this time, the atoms constituting the sample are excited, so that the light having a predetermined wavelength for each element, that is, spectrum ( Spectrum) is a method of analyzing the spectrum. In the case of performing luminescence analysis, the analysis area may be small, and thus, even if only a part of the surface of the sample is good, the analysis can be performed.

However, if the coagulation structure of the sample is a line structure in which graphite is determined, the analysis accuracy tends to be extremely bad due to abnormal light emission due to selective discharge into graphite. It must be a quenched sample in which the C in the analytical site is all carbides (eg, Fe ₃ C, cementite), that is, ringworm (white with no graphite crystallization).

However, the chilling depth of the molten iron sample is determined by the injection temperature, the cooling rate of the mold, the C and Si content in the molten iron, and as the content of C and Si in the molten iron increases, the convolution of the sample (C is determined as graphite and the wavefront This gray) is encouraged so that the sample depth of the sample is limited to less than 0.5 mm.

Therefore, since the polishing depth of the luminescence analysis sample in actual steel works is limited to less than 0.3 ~ 0.4mm, it is very important to ensure the integrity of the sample surface.

As described above, since the solidification structure of the molten iron is affected by the chemical composition and the molten iron temperature, it is very difficult to obtain a good sample of the chilled layer only by controlling the cooling ability of the mold, and also due to the low molten iron temperature and poor injectability and impurity mixing. If the surface of the sample is not beautiful due to the like or the like, abnormal light emission is likely to occur due to surface defects.

In this case, X-Ray analysis is usually performed. X-Ray analysis is performed by irradiating X-Ray to the entire surface of a circular sample having a Ø 25 to 30 mm mask on a polished sample. Refers to the method of analyzing characteristic X-rays.

However, in the case of the X-Ray analysis, the whole analysis surface of the sample must be sound without a certain size or more defects, it takes several seconds longer than the luminescence analysis method, and C, which is one of the main components of the molten iron. There is a disadvantage that cannot be analyzed.

On the other hand, regardless of the coagulation structure of the sample, that is, regardless of the line or white line tissue, the analysis can be performed by regrinding until the analysis surface is good, and the polishing depth of the sample can be uniformly adjusted deeply. There is an advantage that can reduce the deviation and defective rate.

Therefore, the steel mill adopts an analytical method in consideration of the advantages and disadvantages of the analytical method, and in most cases, both methods are employed to analyze the molten iron sample according to the process conditions.

As such, the sampler, which plays a very important role in collecting the molten iron, may have various forms as shown in FIGS. 1A and 1B.

For example, in the case of Figure 1a and the sampling port consisting of a ceramic case 12 and the cooling plate 14; The temperature sensor (T), the compensation wire (L), the connector (C), the sensor protection cap (P) is composed of a structure that is fixed to the molding sand after being disposed inside the branch pipe (10) constituting the appearance of the probe .

By the way, such a series of operations should be used to fix the position of the built-in components, including the temperature measurement element and the sampling port by using the molding sand, these fixing operations are not easy, and the assembly position is also not constant, it is difficult to standardize the product The problem of quality deviations is likely to occur.

As a specific example of such a quality deviation, when the compensation lead and the cooling plate are assembled in close proximity to each other, if there is a temperature difference between (+) and (-) at the connection of the compensation lead, a corresponding thermoelectric power is generated to generate a measurement error. It is easy to cause the temperature deviation due to the difference in the thermal equilibrium of the temperature sensing part due to the difference in the protruding length, and if the sealing of the sampling port is incomplete, casting of small particles enters the sampling port during the fabrication of the probe. Problems such as providing the cause of the back.

In addition, in the case of the conventionally illustrated molten iron probe, the foundry sand is completely filled inside the branch pipe and needs to be heated to be fired so that the baked foundry sand is in a state of unified mass and there is no empty space inside. The shell block is not easily differentiated even when hitting the outside of the probe several times, so that the sample taking operation is not easy.

Further, when the protective cap is lost by immersing the probe in the molten metal, the protective cap is lost and then opened. There is a problem in that the burned debris of the branch pipe and the gas generated at the same time are mixed together with the inflow of the molten iron, thereby increasing the surface defect of the sample.

As a result, in the above case, in order to secure a good analysis surface, deepening of the sample can be ensured to ensure a sound analysis surface, and thus, there is a disadvantage in that luminescence analysis cannot be performed in a molten condition in which a thin layer of sample is formed.

As another example, in the case of Figure 1b is a ceramic case (12 ") to obtain a sample for two purposes (a disk sample, a pin-shaped sample) through a single sampling inside the branch pipe (10 '), and is installed in communication with the lower portion After the sampling holes made of the mold 12 ', the protective cap 22, the sample inlet 24 and the like protected by the protective cap 22 are embedded, these gaps are sealed with a refractory cement, and the branch pipe 10 ') It can be made to have a certain strength by integrating them by heating and firing the molding sand in the state filled with the molding sand completely.

However, in this case, there is a disadvantage that the quality of the sample is lowered due to the lack of lacquer.

The present invention was created in view of the above-mentioned problems in the prior art, and solved this problem. The surface integrity of the sample is good, the component accuracy is excellent, the assembly method is simple, the productivity is good, and the sample is taken out when collecting the sample. The main problem is to provide a sampler for a molten iron probe which is easy and can simultaneously sample the molten iron and measure the temperature.

The present invention as a means for achieving the above-described problems, in the sampler for the molten iron probe that can simultaneously sample and temperature measurement; A shell block fitted to an outer shell of the probe and having a portion of an outer surface thereof opened; A sampling port embedded in the shell block and formed of a ceramic case and a cooling plate; Eccentrically installed on the bottom surface of the shell block, and provides a sampler for a molten iron probe characterized in that consisting of a temperature measuring sensor protected by a sensor protective cap.

At this time, one end of the shell block is formed with a first step of fitting the outer shell protective tube forming the outer appearance of the lower end of the probe, and the other end is the inner branch which is located inside the outer branch at the same time the outer branch forming the outer shape of the probe A second stepped portion is formed, and the gap between them is also characterized by the application of the refractory cement.

In addition, the inner bottom of the shell block is characterized in that the at least one or more inclined protrusions for guiding the sample collection port is seated closely.

In addition, the sampling port is an inlet through which the molten metal is introduced, a quartz tube inserted into the inlet, an inlet cap fitted to the quartz tube, an indentation groove extending and extending from the inlet, and vertically from the indentation groove. A ceramic case comprising an extended runway and a sample chamber connected to the runway and enlarged and filled with a sample; It is also characterized by a metal cooling plate provided on both sides of the inner wall of the sample chamber of the ceramic case.

Further, the turbidity is also characterized in that the cross section is reduced in the direction of the sample chamber from the pressure groove.

According to the present invention, it is possible to minimize the defect of the sample inevitably caused during the sampling process, and also to improve the success rate of analysis by providing a disk-shaped sample that is easy for automated analysis, the method of assembling the temperature sensor and the sampler It can reduce the standard deviation of the product, such as the temperature measurement deviation, it is easy to withdraw the sample when collecting the sample, the efficiency of the sampling operation is improved, the production process is simple, the productivity can be improved.

1 is an exemplary cross-sectional view of a sampler for a molten iron probe according to the prior art,

2 is an exemplary partial cross-sectional view of a molten iron probe equipped with a sampler according to the present invention;

Figure 3 is a perspective view of the main part and sectional view of the main part constituting the sampler according to the present invention,

4 is a structural diagram of a sampler according to the present invention.

♧ description of the symbols for the main parts of the drawing ♧

100 .... Shell Block 110 .... Sensor

112 .... Sensor protection cap 200 .... Sample collection

310 .... Internal branch building 320 .... Outside branch building

330 .... shell sheath

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

Figure 2 is an exemplary partial cross-sectional view of the molten iron probe is equipped with a sampler according to the present invention, Figure 3 is a perspective view and main sectional view of the main portion constituting the sampler according to the present invention, Figure 4 is a sampler according to the present invention It is a structural diagram.

2 to 4, the molten iron probe according to the present invention includes a shell block 100 having a temperature measuring sensor 110.

The shell block 100 is formed in a cylindrical shape with a portion of the outer surface is opened, and the sampling port 200 is charged therein.

At this time, the sensor 110 is eccentrically fixed to one end surface of the shell block 100, the sensor 110 is protected by a sensor protective cap 112.

In addition, a first step 102 is formed near an end of the shell block 100 in which the sensor 110 is installed, and a second step 104 is provided at an opposite end of the first step 102. The end where the second stepped portion 104 is formed is protruded, and a compensation lead guide groove 106 is formed in a part of the outer surface thereof.

Thus, the compensation lead (not shown) drawn from the sensor 110 passes through the shell block 100 and passes through the compensation lead guide groove 106 in the form shown in FIG. Passing through the inside of the inner tube 310 is connected to the connector 300 provided in the inner.

Here, the inner branch pipe 310 is fitted and fixed to the second step 104 of the shell block 100, the outer branch pipe 320 to protect and form the outer shell of the inner branch pipe 310 is the second It is arranged in a form that is in close contact with the surface of the step (104).

In addition, one end of the outer shell protective tube 330 is seated on the first step 102 of the shell block 100, and the shell block 100 is generally fitted to the outer shell protective tube 330.

In addition, the open outer surface of the shell block 100 is sealed by the refractory cement 340.

At this time, the refractory cement 340 not only seals the gap of the open portion of the shell block 100 but also seals the gap between the outer shell protection tube 330, the outer branch pipe 320, and the inner branch pipe 320. .

In addition, by arranging the sensor 110 to protrude a predetermined length from the bottom surface of the shell block 100 and eccentricity so that the temperature can be measured immediately in a state that is not affected by the shell block 100 at all, the temperature measurement due to heat loss By eliminating the deviation, the accuracy and responsiveness of the measured temperature value can be further increased.

On the other hand, the sample collection port 200 seals the ceramic case 210, the open both sides of the sample chamber 250 of the ceramic case 210 and one side of the hot water groove 230, the hot water 240 to be described later. It is composed of a metal cooling plate 212 is built in the shell block 100.

To this end, the inner side of the shell block 100 is formed with a receiving groove (not shown in the figure) slightly larger than the sample collection port 200, the inner both sides of the receiving groove is gradually thicker from the outside to the inside It is preferable that an inclined protrusion (not shown) of about 0.5 to 1 mm in size is formed in an increased form.

At this time, the inclined protrusion is fixed to guide the ceramic case constituting the sample collection port 200 and the cooling plate to be completely coupled without gaps while the molding sand projections are broken when the sample collection port 200 is inserted into the molten metal. The opening of the ceramic case due to the positive pressure is prevented.

In addition, the shell block 100 used in the present invention is preferably manufactured to have a predetermined strength or more by calcining a coated sand (Coated Sand) mixed with a sand and a resin binder.

On the other hand, the sampling port 200 according to the present invention, as described above, is composed of a ceramic case 210 and a metal cooling plate 212, the ceramic case 210 is only two sides of the sample chamber 250 All are kept open, and the cooling plate 212 seals both open sides of the sample chamber 250.

And, as shown in Figure 4, the ceramic case 210, the front end of one side is formed to be horizontally opened and the inlet port 220 through which the molten metal is introduced, the pressure in the rear is enlarged while being connected to the inlet port 220 The water groove 230, the waterway 240 formed vertically from the pressure groove 230 and extending downward, and the sample chamber 250 formed at the lower end of the waterway 240 to receive and collect a sample. ) Is configured to be concave on one side, wherein only the sample chamber 250 is configured to be completely bored.

At this time, the cooling plate 212 is formed to correspond to the size of the sample chamber 250, it is preferable to be installed on both sides of the inside of the sample chamber 250.

In addition, although not shown in the drawings, a plurality of leak holes (vent holes) V may be further provided on both sides of the ceramic case 210 to facilitate the inflow of the molten metal.

Further, a quartz tube 224 is formed in the inlet 220, and a quartz tube 226 is fitted to be caught by the inlet 220, and an inlet cap 222 is mounted in the quartz tube 226.

In addition, the water flow 240 is preferably formed in the inclined shape that the cross section is reduced in the direction of the sample chamber 250 in the pressure groove (230), which is a shock ( Stress) is concentrated on the runway 240 so as to make the connection between the disk-shaped sample and the runway 240 clean.

In addition, the shape and size of the molten water 240 is formed to be almost the same size as the quartz tube which is the inlet 220 of the molten metal so that the molten metal gradually flows along the cooling plate from the pressure groove 230 to the sample chamber 250. By induction, mixing of air by turbulence is suppressed.

In addition, in the recent analysis technology in steel mills, further analysis automation is performed, and the processes such as sample transfer, sample polishing, and component analysis are automatically performed by a robot or a mechanical device. If 240 is not beautifully removed and there is a protrusion at the edge of the sample, it becomes difficult to automate the analysis because the gripping of the sample is unstable in a series of processes such as conveying, polishing, and component analysis of the sample, causing equipment errors.

Therefore, it is preferable to design so that only an unnecessary sample portion can be easily separated and used in the analysis, and the present invention is optimally designed therefor.

The present invention made of such a configuration can be utilized as follows.

That is, the sample collection port 200 composed of the cooling plate 212 and the ceramic case 210 is inserted into the shell block 100, and then the quartz tube 226 is inserted into the inlet 220 of the ceramic case 210. After fixing the outer protective tube 330 and the entire open groove of the shell block 100 is applied with a refractory cement, slightly lower than the height of the quartz tube 226 and the inlet cap 222 at the inlet of the quartz tube 226 Attached to complete the sampler for the molten iron probe consisting of the temperature measuring sensor 110 and the sampling port 200 and the outer shell protective tube 330.

As described above, since the refractory cement is coated in a wide range around the inlet 220, it is possible to prevent the gas and foreign substances generated from the branch pipe or foundry sand from being mixed, as in the conventional probe. The surface defects can be minimized and the sample integrity can be greatly improved.

In addition, the outermost outer diameter of the shell block 100 is preferably formed not larger than the outer diameter of the outer shell protective tube 330 forming the outermost portion of the probe in consideration of workability when manufacturing and handling the probe.

In addition, it is preferable that the first stepped portion 102 is tapered in a shape that is gradually increased toward the inside so that it can be easily integrated with the branch pipe even with a small amount of refractory cement.

When the sampler for the molten iron probe configured as described above is deposited on the molten metal, the temperature of the molten metal is measured by the sensor 110 while the sensor protective cap 112 is melted.

At the same time, the inlet cap 222 of the sample collection port 200 attached to the side of the shell block 100 is also lost in the molten metal and opened therein, so that the molten metal flows through the quartz tube 226 to the sample chamber 250. It will be filled and a sample will be taken when the filling is complete.

Thereafter, the probe is recovered from the molten metal and subjected to blow to the shell block 100 to separate and separate the solidified sample from the sample. In this case, the sample collection port 200 includes the outer branch pipe 320 and the shell block 100. Since the whole of the open groove of the coated with the refractory cement is fixed and can be easily separated by only one or two blows, it is very easy to take out the sample.

In addition, since the same size of the cooling plate having a good cooling ability of the sample is attached to the ceramic case 210, the whiteness of the sample is good, thereby improving the accuracy of the analysis during the emission analysis.

Claims (5)

In the sampler for a molten iron probe which can simultaneously sample and temperature measurement; A shell block fitted to an outer shell of the probe and having a portion of an outer surface thereof opened; A sampling port embedded in the shell block and formed of a ceramic case and a cooling plate; Eccentrically installed on the bottom surface of the shell block, the sampler for a molten iron probe characterized in that consisting of a sensor for measuring the temperature protected by a sensor protective cap. The method according to claim 1; One end of the shell block is formed with a first step of fitting the outer shell protective tube forming the outer appearance of the lower end of the probe, the other end of the outer inner tube forming the outer shape of the probe is in close contact and at the same time the inner inner tube is located inside the outer branch A second step is formed, the sampler for a molten iron probe, characterized in that the refractory cement is applied to the gap between them. The method according to claim 1; Sample collector for a molten iron probe, characterized in that the inner bottom of the shell block is formed with at least one inclined protrusion for guiding the sampling port is closely inserted and seated. The method according to claim 1; The sampling port may include an inlet through which a molten metal is introduced, a quartz tube inserted into the inlet, an inlet cap fitted into the quartz tube, an indentation groove extending and extending from the inlet, and a bath vertically extending from the indentation groove. A ceramic case comprising a sample chamber connected to the tiled waterway and enlarged and filled with a sample; A sampler for a molten iron probe, characterized in that consisting of a metal cooling plate provided on both sides of the inner wall of the sample chamber of the ceramic case. The method according to claim 4; The turbidity sampler for a molten iron probe, characterized in that the cross section is reduced in the direction of the sample chamber from the pressure groove.