Molten Liquid Detection Device and Method

Abstract

The present invention belongs to the field of optoelectronic analysis, and particularly relates to a molten liquid detection device and method. The detection device includes an optoelectronic detection unit and an isolation cylinder; the detection device further includes a maintenance unit, and the maintenance unit includes: a carrier for carrying a rotating member, and the bottom end of the rotating member has a slag-breaking portion; a first driving module for driving the carrier to move vertically, and a second driving module for driving the rotating member to rotate; a judgment unit for judging whether the inside of the isolation cylinder is blocked; a control unit for controlling the operation of the maintenance unit according to the result of the judgment unit. The present invention realizes real-time judgment and maintenance, protects the isolation cylinder, and provides guarantee for long-term measurement.

Description

Technical Field

[0001] The present invention relates to optoelectronic analysis, and particularly to a molten liquid detection device and method. Background Art

[0002] In the metallurgy and casting industries, component detection has always been crucial, and the control of product components directly determines product quality and energy utilization efficiency. Currently, component detection in the metallurgy and casting industries mainly involves a series of processes such as manual sampling - cooling - sample preparation, and then sending it to a laboratory for analysis, which belongs to off-line analysis and cannot guide the production process in real time, greatly affecting production efficiency and causing energy waste. The immersion LIBS in-situ analyzer can insert a probe into molten metal, use a laser to excite plasma, and measure the concentration of each element in the molten metal in real time.

[0003] However, during long-term measurement, the bottom end of the immersion probe will be gradually blocked by various slag in the molten metal, resulting in inaccurate measurement results. It is necessary to remove the probe and use a high-temperature flame to melt it or strong acid / strong alkali to dissolve the slag, which is time-consuming and laborious and has certain safety hazards.

[0004] In addition, no matter what measures are taken for hot-dip galvanizing of products, through various reactions, oxidation, and corrosion, a certain amount of iron elements will inevitably enter the liquid zinc in the zinc pot. This element reacts with Zn to produce zinc slag. Zinc slag is divided into bottom slag and surface slag. The surface slag has a low density and floats on the surface of the zinc liquid, while the bottom slag has a high density and precipitates at the bottom of the zinc liquid. The bottom slag will cause a large amount of waste and seriously affect the surface and performance of the strip steel. At the same time, a large area of bottom slag will cause wear of the zinc pot rollers and various defects such as zinc ash and zinc particles on the surface of the strip steel.

[0005] Currently, for the treatment of zinc slag in the hot-dip galvanizing zinc pot, it is often through the addition of Zn-Al alloy to convert the bottom slag into surface slag for easy removal. However, since the generation content of surface slag and bottom slag in the zinc liquid cannot be calculated, the amount of Zn-Al alloy added is often based on experience. A large amount of resources will be wasted in this process. Summary of the Invention

[0006] To solve the deficiencies in the above-mentioned prior art solutions, the present invention provides a molten liquid detection device.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A molten liquid detection device includes an optoelectronic detection unit and an isolation cylinder; the detection device further includes a maintenance unit, and the maintenance unit includes:

[0009] a carrier and a rotating member, the carrier is used to carry the rotating member, and the bottom end of the rotating member has a slag-breaking part;

[0010] A first driving module and a second driving module, wherein the first driving module is used to drive the carrier to move vertically, and the second driving module is used to drive the rotating member to rotate;

[0011] A judging unit, which is used to judge whether the inside of the isolation cylinder is blocked;

[0012] A control unit, which is used to control the operation of the maintenance unit according to the result of the judging unit.

[0013] The present invention also provides a molten liquid detection method, and the object of the invention is achieved through the following technical solutions:

[0014] A molten liquid detection method, including a maintenance stage and a detection stage; the maintenance stage is as follows:

[0015] The photoelectric detection unit obtains the content of characteristic elements in the substance at the bottom end inside the isolation cylinder;

[0016] Judge whether the content exceeds the threshold value, and send the judgment result to the control unit;

[0017] When the judgment result is yes, the control unit sends a maintenance instruction to the maintenance unit;

[0018] The first driving module drives the carrier to move vertically downward, and the rotating member arranged on the carrier descends vertically inside the isolation cylinder. At the same time, the second driving module drives the rotating member to rotate, and the slag-breaking part at the bottom end of the rotating member breaks the blockage inside the isolation cylinder.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. On-site maintenance is realized;

[0021] Judge whether there is slag blocking the isolation cylinder through the content of characteristic elements (or the spectral intensity corresponding to the content), and drive the rotating member to descend and rotate synchronously according to the judgment result, so as to break the blockage, realizing on-site cleaning, without disassembly, improving the maintenance efficiency, protecting the isolation cylinder, and providing guarantee for long-term measurement;

[0022] 2. Accurate measurement;

[0023] The spectral element spectral lines are excited by LIBS (Laser Induced Breakdown Spectroscopy) technology, then the spectra corresponding to the surface slag and the bottom slag are screened, then the surface slag spectrum and the bottom slag spectrum are identified, and finally the contents of the surface slag and the bottom slag are calculated through a physical model, so as to control the addition content of the Zn-Al alloy. Description of the Drawings

[0024] With reference to the accompanying drawings, the disclosure of the present invention will become more readily understandable. It is readily understandable to those skilled in the art that these drawings are only used to illustrate the technical solutions of the present invention and are not intended to limit the protection scope of the present invention. In the drawings:

[0025] Figure 1 is a schematic structural diagram of the molten liquid detection device of the present invention;

[0026] Figure 2 is a schematic structural diagram of the first driving module of the present invention;

[0027] Figure 3 is a schematic structural diagram of the second driving module of the present invention;

[0028] Figure 4 is a schematic diagram of the light intensity distribution of aluminum in N spectra of the present invention;

[0029] Figure 5 is a schematic diagram of the bottom slag spectrum of the present invention;

[0030] Figure 6 is a schematic diagram of the surface slag spectrum of the present invention;

[0031] Figure 7 is a schematic diagram of the light intensity ratio of the present invention. Specific Embodiments

[0032] Figures 1-7 The following description and the following illustrate alternative specific embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the technical solutions of the present invention. Those skilled in the art should understand that variations or substitutions derived from these specific embodiments will fall within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Thus, the present invention is not limited to the following alternative specific embodiments, but is defined only by the claims and their equivalents.

[0033] Example 1.

[0034] A molten liquid detection device, as Figure 1 shown, includes:

[0035] a photoelectric detection unit and an isolation cylinder 5, and the photoelectric detection unit includes a laser 11, a detector, and an analysis module. These devices are all prior arts in the art.

[0036] A maintenance unit, as Figures 2-3 shown, specifically includes:

[0037] a carrier 28 for carrying a rotating member 35, and the bottom end of the rotating member 35 has a slag-breaking portion 36;

[0038] The first driving module 2 is used to drive the carrier 28 to move vertically, and the second driving module 3 is used to drive the rotating member 35 to rotate;

[0039] The judging unit is used to judge whether the inside of the isolation cylinder 5 is blocked;

[0040] The control unit is used to control the operation of the maintenance unit according to the result of the judging unit.

[0041] In order to drive the carrier to move vertically, further, as Figure 2 shown, the first driving module 2 includes:

[0042] A first motor 21 and a plurality of rotating shafts 22, the first motor 21 drives the rotating shafts 22 to rotate in the same direction through a transmission mechanism, and the rotating shafts 22 are connected to a linkage mechanism;

[0043] A moving member group, one end of the moving member 23 is connected to the carrier 28, and the other end is connected to the rotating shaft 22 through the linkage mechanism. When the rotating shaft 22 rotates, the moving member 23 moves vertically.

[0044] In order to link the rotating shaft 22 and the moving member 23, further, the linkage mechanism includes:

[0045] A first gear 26 is fixed on the horizontally arranged rotating shaft 22, a second gear 27 meshes with the first gear 26, the vertical central through hole has internal threads, and the moving member 23 has external threads matching the internal threads. The moving member 23 vertically passes through the central through hole of the second gear 27.

[0046] In order to drive the rotating member 35 to rotate, further, as Figure 3 shown, the second driving module 3 includes:

[0047] A second motor 31 and a third gear 33, the second motor 31 drives the third gear 33 to rotate, and the third gear 33 is fixed on the rotating member 35.

[0048] In order to reduce the structural complexity, further, the slag breaking part 36 adopts a toothed structure, and the transmission mechanism adopts a synchronous belt 24, which is arranged on adjacent rotating shafts 22.

[0049] A method for detecting a molten liquid according to an embodiment of the present invention, that is, a working method of the detection device in this embodiment, includes a maintenance stage and a detection stage; the maintenance stage is:

[0050] The photoelectric detection unit obtains the content of characteristic elements in the substance at the bottom end inside the isolation cylinder 5;

[0051] Judge whether the content exceeds the threshold value, and send the judgment result to the control unit;

[0052] When the judgment result is yes, the control unit issues a maintenance instruction to the maintenance unit;

[0053] The first driving module 2 drives the carrier 28 to move vertically downward, and the rotating member 35 provided on the carrier 28 descends vertically in the isolation cylinder 5. At the same time, the second driving module 3 drives the rotating member 35 to rotate, and the slag-breaking portion 36 at the bottom end of the rotating member 35 breaks the blockage in the isolation cylinder 5.

[0054] In order to accurately judge whether the isolation cylinder 5 is blocked, further, the ratio of the content of the characteristic element in the blockage to the content in the molten liquid is greater than 100 or less than 0.01.

[0055] Embodiment 2.

[0056] An application example of the molten liquid detection device and method according to Embodiment 1 of the present invention in zinc smelting.

[0057] In this application example, in the galvanizing pot, the substances present are generally effective Al, dissolved Fe, and surface slag Fe 2 Al 5 Zn and bottom slag FeZn 7 Al. The density of the bottom slag ρ 1 = 7.25 g / cm 3 The density of the surface slag ρ 2 = 4.1 g / cm 3 The density of Zn is ρ 3 = 7.14 g / cm 3 The density of Al is ρ 4 = 2.7 g / cm 3 The density of Fe is ρ 5 = 7.86 g / cm 3 .

[0058] In a normal galvanizing pot, the Al content is controlled at 0.2 - 0.23 wt%, the Fe content is 0.0111 - 0.0115 wt%, and the rest is Zn liquid. The surface slag Fe 2 Al 5 The Al content in Zn is 43.24 wt%, the Fe content is 35.8 wt%, and the Zn content is 20.96 wt%. The bottom slag FeZn 7 The Al content in Al is 4.9912 wt%, the Fe content is 10.331 wt%, and the Zn content is 84.6778 wt%. It can be seen that whether it is surface slag or bottom slag, the iron content in them is three orders of magnitude higher than the iron content in the Zn liquid. Therefore, iron is selected as the characteristic element.

[0059] Such as Figure 1As shown in the figure, the detection device includes a housing 1, a protective cover 6, and a ceramic isolation cylinder 5. The isolation cylinder 5 is fixed to the lower side of the protective cover 6. The upper and lower ends of the isolation cylinder 5 are open. The first drive module 2 and the second drive module 3 are arranged inside the protective cover 6. The protective gas provided by the gas supply unit 51 enters the optical path, such as entering the isolation cylinder 5.

[0060] The photoelectric detection unit includes a laser arranged inside the housing 1, and a concave lens 41, a first reflector 42, a first converging lens 43, and a second reflector 44 arranged in sequence on the optical path. The second reflector 44 has a through hole that allows the excitation light to pass through. A second converging lens 45 is arranged on the emission optical path of the second reflector 44. The converged light is coupled into the optical fiber 46 and transmitted into the processing module 12. The detector and the analysis module are arranged inside the processing module 12.

[0061] As Figure 2 shown in the figure, in the first drive module 2, the first motor 21 drives a plurality of horizontally arranged rotating shafts 22 to rotate in the same direction through a belt 24. The first (bevel) gear 26 is fixed to the rotating shaft 22. The second (bevel) gear 27 (with a vertical central axis) meshes with the first gear 26 (with a horizontal central axis). The vertical central through hole of the second gear 27 has internal threads, and the moving member 23 has external threads that match the internal threads. The moving member 23 vertically passes through the central through hole of the second gear 27. When the rotating shaft 22 rotates, the moving member 23 is driven to move in the vertical direction, and then the bearing member 28 is driven to move vertically, that is, the rotating member 35 is driven to move vertically.

[0062] As Figure 3 shown in the figure, in the second drive module 3, the rotating member 35 is arranged on the bearing 34. The bearing 34 is fixed to the bearing member 28. The third gear 33 is fixed to the outer edge of the rotating member 35. The fourth gear 32 connected to the second motor 31 drives the third gear 33 to rotate, thereby driving the rotating member 35 to rotate on the bearing 34. The slag-breaking part 36 at the bottom end of the rotating member 35 adopts a toothed structure.

[0063] A molten liquid detection method according to an embodiment of the present invention, that is, the working method of the detection device in this embodiment, includes a maintenance stage and a detection stage; the maintenance stage is:

[0064] The photoelectric detection unit obtains the content of iron elements in the substance at the bottom end inside the isolation cylinder 5;

[0065] Judge whether the content exceeds the threshold, and send the judgment result to the control unit;

[0066] When the judgment result is yes, the control unit issues a maintenance instruction to the maintenance unit;

[0067] The first driving module 2 drives the carrier 28 to move vertically downward. The rotating member 35 provided on the carrier 28 descends vertically within the isolation cylinder 5. At the same time, the second driving module 3 drives the rotating member 35 to rotate, and the slag-breaking portion 36 at the bottom end of the rotating member 35 breaks the blockage within the isolation cylinder 5.

[0068] The detection stage is as follows:

[0069] The excitation light emitted by the laser 11 sequentially passes through the concave lens 41 and is then reflected by the first mirror 42. The reflected light passes through the through holes of the first converging lens 43 and the second mirror 44, is incident on and excites the molten zinc within the isolation cylinder 5, and the excited plasma emits light. The light is reflected by the second mirror 44, and the reflected light is converged by the second converging lens 45 and coupled into the optical fiber 46. N = 1200 spectra are obtained using the detector.

[0070] Obtain the relative light intensity of aluminum (the ratio of the aluminum spectral intensity at a wavelength of 309.2 nm to the zinc spectral intensity at a wavelength of 206.2 nm) and the relative light intensity of iron (the ratio of the iron spectral intensity at a wavelength of 302.1 nm to the zinc spectral intensity at a wavelength of 206.2 nm) in each spectrum.

[0071] As Figure 4 shown, the distribution of 1200 relative light intensity values of aluminum, and then these 1200 data are subjected to a normal distribution to calculate the number of spectra within the 95% confidence interval. After calculation, the number of spectra within the 95% confidence interval is 1005 (i.e., N - m), so m = 195.

[0072] Average the 1005 spectra to obtain a single spectrum, and then substitute it into the calculation models for Al and Fe elements to obtain the molten aluminum element concentration a = 0.22 wt% and the effective iron element concentration b = 0.013 wt%.

[0073] As Figure 5 shown, for the bottom slag FeZn 7 in the Al spectrum, the Fe content is higher, so the 302.1nm spectral intensity of Fe is higher than that of Al 309.2nm .

[0074] As Figure 6 shown, for the surface slag Fe 2 Al 5 Zn spectrum, due to the high Al content, the 309.2nm spectral intensity of Al is higher than that of Fe 302.1nm .

[0075] Among the m = 195 spectra, obtain the ratio of the relative light intensity of iron to the relative light intensity of aluminum in the spectra. As Figure 7As shown, if the ratio is greater than 1, the spectrum corresponds to the bottom slag; otherwise, the spectrum corresponds to the surface slag. In this way, the number of spectra corresponding to the bottom slag is n = 82, and the number of spectra corresponding to the surface slag is m - n = 113.

[0076] The concentration C of the bottom slag 1 and the concentration C of the surface slag 2 are respectively:

[0077] .

[0078] .

Claims

1. A method for detecting molten liquid, comprising a maintenance phase and a detection phase; characterized in that: The maintenance phases are: The photoelectric detection unit obtains the content of characteristic elements in the material at the bottom of the isolation tube; Determine whether the content exceeds a threshold value, and send the determination result to a control unit; When the judgment result is yes, the control unit sends a maintenance instruction to the maintenance unit; The first driving module drives the bearing member to move vertically downward, and the rotating member arranged on the bearing member vertically descends in the isolation cylinder. At the same time, the second driving module drives the rotating member to rotate, and the slag breaking part at the bottom end of the rotating member breaks the blockage in the isolation cylinder. The detection phase is: The excitation light excites the zinc liquid in the isolation tube multiple times, and the zinc liquid contains bottom slag and surface slag, generating N plasma spectra; Obtain the intensity of aluminum and iron in each spectrum; Screening out m spectra corresponding to the bottom slag and the surface slag, and (Nm) spectra corresponding to normal zinc liquid; Using the (Nm) spectra, the aluminum content a and the iron content b in the zinc liquid are obtained; In the m spectra, if the ratio of the light intensity of iron to the light intensity of aluminum in the spectrum is greater than 1, the spectrum corresponds to bottom slag, otherwise, the spectrum corresponds to surface slag; The concentration C1 of the bottom slag is obtained by using n spectra corresponding to the bottom slag, and the concentration C2 of the surface slag is obtained by using (mn) spectra corresponding to the surface slag; ， ； ρ1, ρ2, ρ3, ρ4, and ρ5 are the densities of bottom slag, surface slag, zinc, aluminum, and iron, respectively.

2. The method for detecting molten liquid according to claim 1, characterized in that: The ratio of the content of the characteristic element in the plugging material to the content in the molten liquid is greater than 100 or less than 0.

01.

3. The method for detecting molten liquid according to claim 1, characterized in that: The molten liquid is zinc liquid, and the characteristic element is iron.

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