Molten liquid detection device and method

Abstract

The invention belongs to the field of photoelectric analysis, and particularly relates to a molten liquid detection device and method.The detection device comprises a photoelectric detection unit and an isolation cylinder; the detection device further comprises a maintenance unit, the maintenance unit comprises a bearing part used for bearing the rotating part, and the bottom end of the rotating part is provided with a slag breaking part; the first driving module is used for driving the bearing part to move vertically, and the second driving module is used for driving the rotating part to rotate; the judgment unit is used for judging whether the isolation cylinder is blocked or not; the control unit is used for controlling work of the maintenance unit according to the result of the judgment unit. According to the invention, real-time judgment and maintenance are realized, the isolation cylinder is protected, and a guarantee is provided for long-time measurement.

Description

Technical Field

[0001] The invention relates to photoelectric analysis, and in particular to a molten liquid detection device and method. Background Art

[0002] In the metallurgical and casting industries, component detection has always been in a key position. The control of product composition directly determines product quality and energy efficiency. At present, the component detection in the metallurgical and casting industries is mainly carried out through a series of processes such as manual sampling-cooling-sample preparation, and then sent to the laboratory for analysis. It is an offline analysis and cannot guide the production process in real time, which greatly affects the production efficiency and causes energy waste. The immersion LIBS in-situ analyzer can insert the probe into the molten metal, use the laser to excite the plasma, and measure the concentration of each element in the molten metal in real time.

[0003] However, during long-term measurement, the bottom of the immersion probe will be gradually blocked by various slags in the molten metal, resulting in inaccurate measurement results. The probe needs to be taken out and melted with a high-temperature flame or concentrated acid / alkali to melt the slag, which is time-consuming and labor-intensive, and has certain safety hazards.

[0004] In addition, no matter what measures are taken for hot-dip galvanizing of products, a certain amount of iron will inevitably enter the liquid zinc in the zinc pot through various reactions, oxidation and corrosion. This element will react 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 settles at the bottom of the zinc liquid. Bottom slag will cause a lot of waste and seriously affect the surface and performance of the strip. At the same time, a large area of ​​bottom slag will cause wear of the zinc pot roller and various defects such as zinc ash and zinc particles on the surface of the strip.

[0005] At present, the treatment of zinc slag in hot-dip galvanizing pots is often done by adding Zn-Al alloy to convert bottom slag into surface slag for easy scooping. However, since it is impossible to calculate the content of surface slag and bottom slag in zinc liquid, the amount of Zn-Al alloy added is often based on experience. This process will cause a lot of waste of resources. Summary of the invention

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

[0007] The objective of the present invention is achieved through the following technical solutions: A molten liquid detection device comprises a photoelectric detection unit and an isolation cylinder; the detection device also comprises a maintenance unit, the maintenance unit comprising: A bearing member and a rotating member, wherein the bearing member is used to bear the rotating member, and the bottom end of the rotating member has a slag breaking portion; a first driving module and a second driving module, wherein the first driving module is used to drive the bearing member to move vertically, and the second driving module is used to drive the rotating member to rotate; A judging unit, the judging unit is used to judge whether the isolation cylinder is blocked; A control unit is used to control the operation of the maintenance unit according to the result of the judgment unit.

[0008] The present invention also provides a method for detecting molten liquid, and the object of the invention is achieved through the following technical solutions: A molten liquid detection method includes a maintenance phase and a detection phase; the maintenance phase is: 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 supporting member to move vertically downward, and the rotating member arranged on the supporting 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.

[0009] Compared with the prior art, the present invention has the following beneficial effects: 1. Realize on-site maintenance; The characteristic element content (or the corresponding spectral intensity) is used to determine whether there is slag blocking the isolation cylinder, and the rotating parts are driven to descend and rotate synchronously according to the judgment results, thereby breaking the blockage, achieving in-situ cleaning without disassembly, improving maintenance efficiency, protecting the isolation cylinder, and providing guarantee for long-term measurement; 2. Accurate measurement; The spectral element lines are excited by LIBS (laser induced breakdown spectroscopy) technology, and the spectra corresponding to the surface slag and bottom slag are screened out. Then the surface slag spectrum and bottom slag spectrum are identified, and finally the surface slag and bottom slag contents are calculated through the physical model, thereby controlling the Zn-Al alloy addition content. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. In the drawings: Figure 1 It is a schematic structural diagram of a molten liquid detection device of the present invention; Figure 2 is a structural schematic diagram of the first driving module of the present invention; Figure 3is a structural schematic diagram of the second driving module of the present invention; Figure 4 is a schematic diagram of the light intensity distribution of aluminum in N spectra of the present invention; Figure 5 is a schematic diagram of the spectrum of bottom slag of the present invention; Figure 6 This is a schematic diagram of the surface residue spectrum of the present invention; Figure 7 It is a schematic diagram of the light intensity ratio of the present invention. DETAILED DESCRIPTION

[0011] Figure 1-Figure 7 The following description describes optional specific embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. In order to teach the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will understand that variations or replacements derived from these specific embodiments will be within the scope of the present invention. Those skilled in the art will 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 optional specific embodiments, but is only limited by the claims and their equivalents.

[0012] Example 1.

[0013] A molten liquid detection device, such as Figure 1 As shown, including: Photoelectric detection unit and isolation tube 5, the photoelectric detection unit includes a laser 11, a detector and an analysis module. These devices are all prior art in this field.

[0014] Maintenance units, such as Figure 2-Figure 3 As shown, specifically including: The bearing member 28 is used to bear the rotating member 35, and the bottom end of the rotating member 35 has a slag breaking portion 36; 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; The judging unit is used to judge whether the isolation cylinder 5 is blocked; The control unit is used to control the operation of the maintenance unit according to the result of the judgment unit.

[0015] In order to drive the bearing member to move vertically, further, as Figure 2 As shown, the first driving module 2 includes: A first motor 21 and a plurality of rotating shafts 22, wherein 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; The moving member group, one end of the moving member 23 is connected to the bearing member 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.

[0016] In order to make the rotating shaft 22 and the moving member 23 work in linkage, the linkage mechanism further comprises: The first gear 26 is fixed on the horizontally arranged rotating shaft 22 , the second gear 27 is meshed with the first gear 26 , the vertical center through hole has an internal thread, the moving member 23 has an external thread matching the internal thread, and the moving member 23 vertically passes through the center through hole of the second gear 27 .

[0017] In order to drive the rotating member 35 to rotate, further, as Figure 3 As shown, the second driving module 3 includes: The second motor 31 and the 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 .

[0018] In order to reduce the complexity of the structure, further, the slag breaking portion 36 adopts a toothed structure, and the transmission mechanism adopts a synchronous belt 24 which is arranged on the adjacent rotating shaft 22 .

[0019] A molten liquid detection method according to an embodiment of the present invention, that is, a working method of the detection device according to this embodiment, includes a maintenance phase and a detection phase; the maintenance phase is: The photoelectric detection unit obtains the content of characteristic elements in the material at the bottom of the isolation tube 5; 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 2 drives the supporting member 28 to move vertically downward, and the rotating member 35 arranged on the supporting member 28 vertically descends 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 part 36 at the bottom end of the rotating member 35 breaks the blockage in the isolation cylinder 5.

[0020] In order to accurately judge whether the isolation tube 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.

[0021] Example 2.

[0022] An example of application of the molten liquid detection device and method in Example 1 of the present invention in zinc smelting.

[0023] In this application example, the substances present in the galvanizing pot are generally effective Al, dissolved Fe, surface slag Fe2Al5Zn and bottom slag FeZn7Al. The bottom slag density ρ1=7.25 g / cm 3 , surface slag density ρ2 = 4.1g / cm 3 , the density of Zn is ρ3=7.14 g / cm 3 , the density of Al is ρ4=2.7g / cm 3 , the density of Fe is ρ5=7.86g / cm 3 .

[0024] Normally, the Al content in the galvanizing pot is controlled at 0.2~0.23wt%, the Fe content is 0.0111~0.0115wt%, and the rest is Zn liquid. The Al content in the surface slag Fe2Al5Zn is 43.24wt%, the Fe content is 35.8wt%, and the Zn content is 20.96wt%. The Al content in the bottom slag FeZn7Al is 4.9912wt%, the Fe content is 10.331wt%, and the Zn content is 84.6778wt%. It can be seen that the iron content in both the surface slag and the bottom slag is 3 orders of magnitude higher than that in the zinc liquid, so iron is selected as the characteristic element.

[0025] like Figure 1 As shown, the detection device includes a housing 1, a protective cover 6 and a ceramic isolation cylinder 5, and the isolation cylinder 5 is fixed to the lower side of the protective cover 6. The isolation cylinder 5 is open at both ends. The first driving module 2 and the second driving module 3 are arranged in the protective cover 6. The protective gas provided by the gas providing unit 51 enters the optical path, such as entering the isolation cylinder 5.

[0026] The photoelectric detection unit includes a laser disposed in the housing 1, and a concave lens 41, a first reflector 42, a first converging lens 43, and a second reflector 44 disposed in sequence on the optical path, wherein the second reflector 44 has a through hole that allows the excitation light to pass through. A second converging lens 45 is disposed on the optical path of the emission light of the second reflector 44, and the converging light is coupled into an optical fiber 46 and transmitted to the processing module 12, wherein the detector and the analysis module are disposed in the processing module 12.

[0027] like Figure 2As shown, in the first driving module 2, the first motor 21 drives multiple horizontally arranged rotating shafts 22 to rotate in the same direction through the belt 24. The first (umbrella) gear 26 is fixed on the rotating shaft 22, the second (umbrella) gear 27 (central axis vertical) is meshed with the first gear 26 (central axis horizontal), the vertical center through hole of the second gear 27 has an internal thread, the moving member 23 has an external thread matching the internal thread, and the moving member 23 vertically passes through the center 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, thereby driving the bearing member 28 to move vertically, that is, driving the rotating member 35 to move vertically.

[0028] like Figure 3 As shown, in the second driving module 3, the rotating member 35 is arranged on the bearing 34, the bearing 34 is fixed on the bearing member 28, and the third gear 33 is fixed on 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 tooth structure.

[0029] A molten liquid detection method according to an embodiment of the present invention, that is, a working method of the detection device according to this embodiment, includes a maintenance phase and a detection phase; the maintenance phase is: The photoelectric detection unit obtains the content of iron in the material at the bottom of the isolation tube 5; 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 2 drives the supporting member 28 to move vertically downward, and the rotating member 35 arranged on the supporting member 28 vertically descends 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 part 36 at the bottom end of the rotating member 35 breaks the blockage in the isolation cylinder 5.

[0030] The detection phase is: The excitation light emitted by the laser 11 passes through the concave lens 41 in sequence, and is then reflected by the first reflector 42. The reflected light passes through the through holes of the first converging lens 43 and the second reflector 44, enters and excites the zinc liquid in the isolation tube 5, and the excited plasma emits light. The light is reflected by the second reflector 44, and the reflected light is converged by the second converging lens 45 and coupled into the optical fiber 46. The detector is used to obtain N=1200 spectra.

[0031] The relative intensity of aluminum (the ratio of the aluminum spectrum intensity at a wavelength of 309.2 nm to the zinc spectrum intensity at a wavelength of 206.2 nm) and the relative intensity of iron (the ratio of the iron spectrum intensity at a wavelength of 302.1 nm to the zinc spectrum intensity at a wavelength of 206.2 nm) in each spectrum were obtained.

[0032] like Figure 4 As shown in the figure, the distribution of 1200 relative intensity values ​​of aluminum is then normalized 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., Nm), so m=195.

[0033] After averaging 1005 spectra to obtain a spectrum, it was substituted into the Al and Fe element calculation models to obtain the molten aluminum element concentration a=0.22wt% and the effective iron element concentration b=0.013wt%.

[0034] like Figure 5 As shown in the spectrum of bottom slag FeZn7Al, the Fe content is higher, so Fe 302.1nm Spectral intensity ratio Al 309.2nm High spectral intensity.

[0035] like Figure 6 As shown in the spectrum of Fe2Al5Zn slag, due to the high Al content, Al 309.2nm Spectral intensity ratio Fe 302.1nm High spectral intensity.

[0036] In m = 195 spectra, the ratio of the relative intensity of iron to the relative intensity of aluminum in the spectrum is obtained, such as Figure 7 As shown in Figure 1, if the ratio is greater than 1, the spectrum corresponds to bottom slag, otherwise, the spectrum corresponds to surface slag. According to this method, the number of spectra corresponding to bottom slag is n=82, and the number of spectra corresponding to surface slag is mn=113.

[0037] The concentration of bottom slag C1 and the concentration of surface slag C2 are respectively: .

[0038] .

Claims

1. A molten liquid detection device, comprising a photoelectric detection unit and an isolation cylinder; characterized in that: The detection device further includes a maintenance unit, which includes: A bearing member and a rotating member, wherein the bearing member is used to bear the rotating member, and the bottom end of the rotating member has a slag breaking portion; a first driving module and a second driving module, wherein the first driving module is used to drive the bearing member to move vertically, and the second driving module is used to drive the rotating member to rotate; A judging unit, the judging unit is used to judge whether the isolation cylinder is blocked; A control unit is used to control the operation of the maintenance unit according to the result of the judgment unit.

2. The molten liquid detection device according to claim 1, characterized in that: The first driving module comprises: A first motor and a rotating shaft group, wherein the first motor drives the rotating shaft group to rotate in the same direction through a transmission mechanism, and the rotating shaft is connected to a linkage mechanism; A moving member group, wherein one end of the moving member is connected to the bearing member, and the other end is connected to the rotating shaft through the linkage mechanism. When the rotating shaft rotates, the moving member moves vertically.

3. The molten liquid detection device according to claim 2, characterized in that: The linkage mechanism comprises: A first gear and a second gear, the first gear is fixed on the horizontally arranged rotating shaft, the second gear is meshed with the first gear, the vertical center through hole of the second gear has an internal thread, the moving member has an external thread matching the internal thread, and the moving member vertically passes through the center through hole of the second gear.

4. The molten liquid detection device according to claim 1, characterized in that: The second driving module comprises: A second motor and a third gear, wherein the second motor drives the third gear to rotate, and the third gear is fixed on the rotating member.

5. The molten liquid detection device according to claim 2, characterized in that: The slag breaking part adopts a toothed structure, and the transmission mechanism adopts a synchronous belt, which is arranged on adjacent rotating shafts.

6. 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 supporting member to move vertically downward, and the rotating member arranged on the supporting 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.

7. The method for detecting molten liquid according to claim 6, 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.

8. The method for detecting molten liquid according to claim 7, characterized in that: The molten liquid is zinc liquid, and the characteristic element is iron.

9. The method for detecting molten liquid according to claim 8, characterized in that: 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 dross is obtained using n spectra corresponding to the bottom dross, and the concentration C2 of the surface dross is obtained using (mn) spectra corresponding to the surface dross.

10. The method for detecting molten liquid according to claim 9, characterized in that: The concentrations C1 of the bottom slag and C2 of the surface slag are respectively: ， ； ρ1, ρ2, ρ3, ρ4, and ρ5 are the densities of bottom slag, surface slag, zinc, aluminum, and iron, respectively.

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