Full-automatic test device and test method for measuring oil coating quantity of tin / chromium plated plate

Abstract

According to the full-automatic test device and test method for measuring the oil coating amount of the tin / chromium plated plate, the middle area of a fixed table top is hollowed out and provided with a sample measuring table, the lower portion of the sample measuring table is connected with an optical detection assembly, the right side of the sample measuring table is provided with an oil film cleaning device, and a waste sample collecting frame is arranged close to the edge of the bottom of the fixed table top; sample holders are respectively arranged on the table surfaces on the left side of the sample measuring table and the right side of the oil film cleaning device, and are internally provided with a plurality of circular sample grooves for placing samples to be detected; a sample to be detected on the sample holder is grabbed to the sample measuring table, the oil film cleaning device or the waste sample collecting frame through an automatic sampling assembly arranged in the upper area of the fixed table top. According to the invention, full-automatic operation is realized, the detection requirement of batch samples is greatly improved, correction coefficients of the elliptical polarization method and the hydrophilic balance method are introduced, the difference between calculated values and true values of different mathematical models in the elliptical polarization method is corrected, and the result accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of testing equipment and methods, and in particular to a fully automated testing method and apparatus for determining the amount of oil applied to tin / chrome plated plates. Background Technology

[0002] Tin-plated / chrome-plated steel sheet refers to a steel sheet with a thin layer of metallic tin (chromium) plated on its surface. Generally speaking, tin-plated / chrome-plated steel sheet is made by rolling low carbon steel into a steel sheet about 2mm thick, which is then pickled, cold rolled, electrolytically cleaned and annealed, leveled, trimmed, cleaned, electroplated, remelted, passivated, oiled, and then cut into finished tin-plated / chrome-plated sheet products.

[0003] The tin used in tin-plated steel sheets is high-purity tin (Sn>99.8%). The tin layer can also be applied using hot-dip plating, which results in a thicker tin layer, requires a larger amount of tin, and does not require purification after plating. Chromium-plated steel sheets have similar production processes and plating structures to tin-plated steel sheets; the difference lies in the presence of a chromium layer on the surface. Chromium plating effectively prevents corrosion of the steel surface, extending its service life. Therefore, coating the steel surface with a layer of metallic chromium is a commonly used and effective anti-corrosion method.

[0004] The oil film on tin / chrome-plated sheets refers to a very thin layer of oil electrostatically coated onto the outermost layer of the sheet. Its function is to prevent the tin / chrome-plated sheet from rusting or scratching during subsequent processing. Users purchasing tin / chrome-plated sheets have requirements regarding the thickness of the oil film. If the thickness is too thin, it will affect its protective performance and subsequent processes such as cutting; if the thickness is too thick, it will affect the adhesion and density of the coating, resulting in defects such as oil spots and pinholes.

[0005] Currently, the thickness of the oil film on tin / chrome-plated plates is only a few nanometers. Ordinary oil film thickness gauges cannot reach such a low detection limit. Under existing technology, the more mature detection methods for the amount of oil on tin-plated plates include solvent extraction, hydrophilic balance, and ellipsometric light method. Since the production processes and coating structures of chrome-plated plates and tin-plated plates are very similar, the same methods can also be used for detection. The solvent extraction, hydrophilic balance, and ellipsometric light methods are explained below:

[0006] 1. Solvent extraction method:

[0007] From the perspective of current technology, this method is too cumbersome and requires the use of volatile organic reagents, which is detrimental to the environment and health. As a result, this method has been largely abandoned in routine testing.

[0008] 2. Hydrophilic balance method:

[0009] The principle of this method is based on the characteristic that DOS oil contains polar hydrophilic groups. The oil on the sample surface is washed off with water, spreading into a monomolecular oil layer on the water surface. The spread area of ​​the oil layer is linearly related to the oil content. However, the process of washing with water and measuring the spread area is time-consuming. While the hydrophilic balance method is a highly accurate absolute measurement method for oil content, it has low detection efficiency and is difficult to apply to batch testing.

[0010] 3. Elliptically polarized light method:

[0011] The principle of this method is that the reflected light after the incident elliptically polarized light irradiates the sample surface is also elliptically polarized light. The polarization state of the reflected light before and after elution of the sample oil film corresponds to the oil content. Since the oil film elution process and the measurement time of the polarization state of the reflected light are both relatively short, theoretically, if full automation can be achieved, production efficiency can be greatly improved, which is of great significance for production quality monitoring.

[0012] However, based on feedback from on-site workers, the elliptic polarization method still has significant drawbacks. The main issue is that ASTM A623-16 "Standard Specification for Tin Mill Products, General Requirements" and GB / T 28291-2012 "Test Method for Oil Coating Amount on Electroplated Tin Steel Sheet Surface" recommend using trichloroethylene or 1-bromopropane for oil film cleaning. However, trichloroethylene or 1-bromopropane vapor cleaning agents are toxic, and long-term exposure poses significant health risks. If this problem is not resolved, personnel are prone to poisoning after contact with the chemical reagents, causing major environmental and health problems. Furthermore, due to the need for protective measures, the testing efficiency in actual production is not ideal. Summary of the Invention

[0013] To address the aforementioned problems, this invention provides a fully automated testing device and method for determining the amount of oil applied to tin / chromium-plated plates, which addresses the shortcomings of existing elliptically polarized light detection methods, such as toxicity and significant environmental and health risks. This solves the problems of human contact with toxic reagents and low batch testing efficiency in actual production.

[0014] A fully automatic testing device for determining the amount of oil applied to tin / chrome plated plates, comprising a horizontally placed fixed platform, characterized in that:

[0015] The fixed platform is a rectangular plate-shaped component made of aluminum. The middle area of ​​the fixed platform is hollowed out and a sample measuring stage is opened there. An optical detection component is connected and fixed on the fixed platform at the lower part of the sample measuring stage. An oil film cleaning device is provided on the right side of the sample measuring stage. A waste sample collection frame is provided near the bottom edge of the fixed platform of the oil film cleaning device.

[0016] On the left side of the fixed platform sample measuring table and the right side of the oil film cleaning device, a sample rack is symmetrically arranged, and the sample rack contains several circular sample slots for placing the samples to be tested.

[0017] An automatic sampling component is provided in the upper area of ​​the fixed platform. The automatic sampling component is used to grab the sample to be tested from the sample holder and transfer it to the sample measuring platform, oil film cleaning device or waste sample collection box.

[0018] According to the present invention, a fully automatic testing device for determining the amount of oil applied to tin / chromium plate is characterized in that the sample measuring stage has a structure with a vertical through hole in the middle that extends through the fixed platform.

[0019] According to the present invention, a fully automatic testing device for determining the amount of oil applied to tin / chromium plate is characterized in that the optical detection assembly includes a detection cover, a detection light source, and an optical detector. The detection cover is an opaque rectangular plate-shaped component. The middle position of the top of the detection cover is fixedly connected to the sample measuring stage, and the lower part is fixedly connected to the fixed platform. The detection light source and the optical detector are respectively disposed below the fixed platform, and the working ends of the detection light source and the optical detector face directly below the sample measuring stage, so as to perform optical detection on the sample to be tested placed on the sample measuring stage.

[0020] According to the present invention, a fully automatic testing device for measuring the amount of oil applied to tin / chromium plate is characterized in that the optical path of the detection light source of the optical detection component is downward illumination type, and the incident angle is 65°.

[0021] According to the present invention, a fully automatic testing device for determining the amount of oil applied to tin / chromium plate is characterized in that the oil film cleaning device includes a cleaning tank, an ultrasonic generator, and a hot air fan. The cleaning tank is set on a fixed platform and has a liquid level sensor installed inside. The cleaning tank is also equipped with an opening and closing sliding door. The ultrasonic generator is located below the cleaning tank, and the hot air fan is located above the cleaning tank.

[0022] According to the present invention, a fully automatic testing device for determining the amount of oil applied to tin / chromium plate is characterized in that the sliding door is made of transparent plexiglass and can cover the upper surface of the cleaning tank, and there are two hot air fans, which are stacked one above the other, and the hot air is blown at an angle of 45° to the upper and lower surfaces of the sample to be tested.

[0023] According to the present invention, a fully automatic testing device for determining the amount of oil applied to tin / chromium plate is characterized in that the automatic sampling component includes a guide rail, a three-axis robotic arm, and a mechanical clamp. The guide rail is arranged laterally in the upper area of ​​the fixed platform. The three-axis robotic arm is mounted on the guide rail, allowing it to move along the guide rail in the X, Y, and Z directions. The mechanical clamp is located at the end of the three-axis robotic arm and is made of non-wetting polytetrafluoroethylene. The mechanical clamp is used to grab the sample to be tested from the sample holder and transfer it to the sample measuring platform, oil film cleaning device, or waste sample collection frame.

[0024] A fully automated test method for determining the amount of oil applied to tin / chrome plated boards, based on the aforementioned fully automated test device for determining the amount of oil applied to tin / chrome plated boards, comprises the following specific steps:

[0025] 1) Place the sample to be tested on the sample holder;

[0026] 2) The automatic sampling component is activated. Its three-axis robotic arm and mechanical gripper pick up the sample to be tested and place it horizontally on the sample measuring stage.

[0027] 3) The detection light source of the optical detection component is started, and the optical detector measures the ellipticity parameters Ψ1 and Δ1 of the sample with oil film for the first time, that is, the amplitude information of the p and s component amplitude ratio parameters before and after light reflection and the phase information of the p and s component phase difference parameters before and after light reflection.

[0028] The p-component refers to linearly polarized light parallel to the plane of incidence (parallel polarized light), while the s-component refers to linearly polarized light perpendicular to the plane of incidence (perpendicular polarized light).

[0029] 4) The automatic sampling component automatically grabs the sample into the cleaning tank 3a of the oil film cleaning device 3, the ultrasonic generator 3b cleans the oil film of the sample, and then the hot fan 3c dries the sample.

[0030] This step is the automatic oil film cleaning process on the sample surface. During cleaning, the sliding door will open automatically, and the mechanical clamp of the automatic sampling component will hold the sample and lower it into the cleaning tank.

[0031] 5) The automatic sampling component automatically picks up the sample cleaned in step 4) and places it back onto the sample measuring stage;

[0032] 6) The optical detection component performs a second measurement of the ellipticity parameters Ψ2 and Δ2 of the oil-free sample. Based on the first measurement of Ψ1 and Δ1 and the second measurement of Ψ2 and Δ2, the surface oil concentration is calculated from these two measurements of ellipticity parameters, in mg / m³. 2 ;

[0033] 7) The automatic sampling component automatically grabs the sample and places it into the waste sample collection box (4), discarding the waste sample;

[0034] 8) Select 1 to n groups of tin / chromium plate samples with different oil coating amounts. Take two samples from adjacent positions along the rolling direction for each group. For the first sample, determine the surface oil coating concentration (C11 to C1n) using the elliptic polarization method according to steps 1) to 7). For the second sample, determine the surface oil coating concentration (C21 to C2n) using the hydrophilic balance method. Combine the results of the two methods for this group of samples. 11 ~C 1n and C 21 ~C 2n Correlation analysis was performed, and the regression equation was obtained:

[0035] C = b * C0 + a ...

[0036] In the formula: C represents the actual concentration of the surface oil coating, in mg / m³. 2 ;

[0037] C0 represents the surface oil concentration measured by an ellipsometry, in mg / m³. 2 ;

[0038] b and a are regression coefficients;

[0039] 9) Based on the formula in step 8), take the tin / chromium plate sample to be tested and determine the surface oil concentration C0 using elliptic polarization light method according to steps 1) to 7), in mg / m³. 2 The final calculated concentration C of the surface oil coating amount is in mg / m³. 2 .

[0040] According to the present invention, a fully automatic test method for determining the amount of oil applied to a tin / chromium plate is characterized in that, in step 1), the sample to be tested is specifically a tin / chromium plate processed into a circular sheet with a diameter of 50 mm.

[0041] According to the present invention, a fully automatic test method for determining the amount of oil applied to tin / chromium plate is characterized in that, in step 4), the cleaning agent of the oil film cleaning device is anhydrous ethanol, and the cleaning agent must submerge the sample; the ultrasonic cleaning time is 10-20s; and a hot air fan is used to automatically dry the cleaning agent on the sample surface for 5-15s.

[0042] When the hot air fan automatically dries the cleaning agent on the sample surface, the mechanical clamp should hold the sample in the middle position between the two hot air fans, so that the stacked hot air fans can blow at an angle of 45° to the upper and lower surfaces of the sample to be tested.

[0043] The following beneficial effects were obtained by using the fully automated testing device and method for determining the amount of oil applied to tin / chromium plate according to the present invention:

[0044] 1. The fully automatic testing device and method for determining the amount of oil coating on tin / chromium plate of the present invention replaces the toxic oil film cleaning agent with non-toxic anhydrous ethanol, and replaces the cleaning method with ultrasonic dissolution instead of steam dissolution, which greatly reduces the pollution of the environment and the harm to human health caused by chemical reagents.

[0045] 2. The fully automatic testing device and method for determining the amount of oil applied to tin / chromium plate of the present invention introduces the correction coefficients of elliptic polarization method and hydrophilic balance method, corrects the difference between the calculated value and the true value of different mathematical models of elliptic polarization method, and improves the accuracy of the results;

[0046] 3. The fully automatic testing device and method for determining the amount of oil applied to tin / chromium plate of the present invention can operate fully automatically, reducing manual operation steps, greatly improving production efficiency, and well meeting the testing requirements of batch samples.

[0047] 4. The fully automatic testing device and method for determining the amount of oil applied to tin / chromium plate of the present invention, wherein during the sample cleaning process, the robotic arm clamps the sample throughout the process without changing the direction of the sample, and the software precisely positions the sample when placing it, so the fully automatic sample device can well ensure that the two measurements of ellipticity parameters are performed at the same position on the sample, reducing errors and greatly improving the accuracy of the measurement results. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the overall structure of a fully automatic testing device and method for determining the amount of oil applied to tin / chromium plate according to the present invention.

[0049] Figure 2 This is a schematic diagram of the oil film cleaning device for a fully automatic testing apparatus and method for determining the amount of oil applied to tin / chromium plate according to the present invention.

[0050] Figure 3 This is a plan view of the optical detection component of a fully automatic testing device and method for measuring the amount of oil applied to tin / chromium plate according to the present invention.

[0051] In the diagram: 1-Fixed platform, 2-Sample measuring stage, 2a-Vertical through hole, 3-Oil film cleaning device, 3a-Cleaning tank, 3a1-Opening sliding door, 3b-Ultrasonic generator, 3c-Hot fan, 4-Waste sample collection frame, 5-Sample rack, A-Optical detection assembly, A1-Detection cover, A2-Detection light source, A3-Optical detector, B-Automatic sampling assembly, B1-Guide rail, B2-Three-axis robotic arm, B3-Mechanical clamp. Detailed Implementation

[0052] The following description, in conjunction with the accompanying drawings and embodiments, further describes the technical means, creative features, objectives, and effects of the fully automatic testing device and method for determining the amount of oil applied to tin / chromium plates according to the present invention.

[0053] like Figures 1-3 As shown, a fully automatic testing device for determining the amount of oil applied to a tin / chromium plate includes a horizontally placed fixed platform 1, which is a rectangular aluminum plate component. A sample measuring platform 2 is hollowed out in the middle area of ​​the fixed platform. An optical detection component A is connected to and fixed on the fixed platform at the lower part of the sample measuring platform. An oil film cleaning device 3 is provided on the right side of the sample measuring platform. A waste sample collection frame 4 is provided near the bottom edge of the fixed platform of the oil film cleaning device.

[0054] On the left side of the sample measuring table 2 and the right side of the oil film cleaning device 3 of the fixed table 1, a sample rack 5 is symmetrically arranged. The sample rack has several circular sample slots for placing the samples to be tested.

[0055] An automatic sampling component B is installed in the upper area of ​​the fixed platform 1. The automatic sampling component is used to grab the sample to be tested on the sample holder 5 and transfer it to the sample measuring platform 2, the oil film cleaning device 3, or the waste sample collection box 4.

[0056] The sample measuring platform 2 has a structure with a vertical through hole 2a in the middle that passes through the fixed platform 1.

[0057] The optical detection assembly A includes a detection cover A1, a detection light source A2, and an optical detector A3. The detection cover is an opaque rectangular plate-shaped component. The middle of the top of the detection cover is fixedly connected to the sample measuring stage 2, and the bottom is fixedly connected to the fixed platform 1. The detection light source and the optical detector are respectively located below the fixed platform, and the working ends of the detection light source and the optical detector face directly below the sample measuring stage to perform optical detection on the sample to be tested placed on the sample measuring stage.

[0058] The optical path of the detection light source A2 of the optical detection component A is downward illumination, with an incident angle of 65°.

[0059] The oil film cleaning device 3 includes a cleaning tank 3a, an ultrasonic generator 3b, and a hot air fan 3c. The cleaning tank is set on a fixed platform 1 and has a liquid level sensor inside. The cleaning tank is also equipped with an opening and closing sliding door 3a1. The ultrasonic generator is set below the cleaning tank, and the hot air fan is set above the cleaning tank.

[0060] The sliding door 3a1 is made of transparent plexiglass and can cover the upper surface of the cleaning tank 3a. There are two hot air fans 3c, which are stacked one on top of the other. The hot air is blown at an angle of 45° to the upper and lower surfaces of the sample to be tested.

[0061] The automatic sampling component B includes a guide rail B1, a three-axis robotic arm B2, and a mechanical clamp B3. The guide rail is arranged horizontally in the upper area of ​​the fixed platform 1. The three-axis robotic arm is mounted on the guide rail, allowing it to move along the guide rail in the X, Y, and Z directions. The mechanical clamp is located at the end of the three-axis robotic arm. The mechanical clamp is made of non-wetting polytetrafluoroethylene and is used to grab the sample to be tested from the sample holder 5 to the sample measuring stage 2, the oil film cleaning device 3, or the waste sample collection box 4.

[0062] A fully automated test method for determining the amount of oil applied to tin / chrome plated boards, based on the aforementioned fully automated test device for determining the amount of oil applied to tin / chrome plated boards, comprises the following specific steps:

[0063] 1) Place the sample to be tested on the sample holder 5;

[0064] 2) When the automatic sampling component B is activated, its three-axis robotic arm B2 and mechanical clamp B3 will pick up the sample to be tested and place it horizontally on the sample measuring stage 2.

[0065] 3) The detection light source A2 of the optical detection component A is started, and the optical detector A3 measures the ellipticity parameters Ψ1 and Δ1 of the sample with oil film for the first time, that is, the amplitude information of the p and s component amplitude ratio parameters before and after light reflection and the phase information of the p and s component phase difference parameters before and after light reflection.

[0066] 4) The automatic sampling component automatically grabs the sample into the cleaning tank 3a of the oil film cleaning device 3, the ultrasonic generator 3b cleans the oil film of the sample, and then the hot fan 3c dries the sample.

[0067] 5) The automatic sampling component automatically picks up the sample cleaned in step 4) and places it back onto the sample measuring stage;

[0068] 6) The optical detection component performs a second measurement of the ellipticity parameters Ψ2 and Δ2 of the oil-free sample. Based on the first measurement of Ψ1 and Δ1 and the second measurement of Ψ2 and Δ2, the surface oil concentration is calculated from these two measurements of ellipticity parameters, in mg / m³. 2 ;

[0069] 7) The automatic sampling component automatically grabs the sample and places it into the waste sample collection box (4), discarding the waste sample;

[0070] 8) Select 1 to n groups of tin / chromium plate samples with different oil coating amounts. Take two samples from adjacent positions along the rolling direction for each group. For the first sample, determine the surface oil coating concentration (C11 to C1n) using the elliptic polarization method according to steps 1) to 7). For the second sample, determine the surface oil coating concentration (C21 to C2n) using the hydrophilic balance method. Combine the results of the two methods for this group of samples. 11 ~C 1n and C 21 ~C 2n Correlation analysis was performed, and the regression equation was obtained:

[0071] C = b * C0 + a ...

[0072] In the formula: C represents the actual concentration of the surface oil coating, in mg / m³. 2 ;

[0073] C0 represents the surface oil concentration measured by an ellipsometry, in mg / m³. 2 ;

[0074] b and a are regression coefficients;

[0075] 9) Based on the formula in step 8), take the tin / chromium plate sample to be tested and determine the surface oil concentration C0 using elliptic polarization light method according to steps 1) to 7), in mg / m³. 2 The final calculated concentration C of the surface oil coating amount is in mg / m³. 2 .

[0076] In step 1), the sample to be tested is specifically a tin / chromium plate processed into a circular sheet with a diameter of 50mm.

[0077] In step 4), the cleaning agent of the oil film cleaning device is anhydrous ethanol, and the cleaning agent must submerge the sample. The ultrasonic cleaning time is 10-20 seconds. The cleaning agent on the sample surface is automatically dried by a hot fan for 5-15 seconds.

[0078] Example 1 - Determination of the amount of oil applied to tin-plated plates:

[0079] A newly produced tinplate was selected as the test target and processed into a 50mm diameter disc, which was then placed in a sample holder. The ultrasonic cleaning time with anhydrous ethanol was set to 15 seconds, and the hot air drying time to 5 seconds. Based on steps 1) to 9), the oil coating amount of the tinplate was determined to be 3.5 mg / m². 2 .

[0080] Example 2 - Determination of the amount of oil applied to chrome-plated plates:

[0081] A freshly produced chrome-plated sheet was used as the test target. It was processed into a 50mm diameter disc and placed in a sample holder. The ultrasonic cleaning time with anhydrous ethanol was set to 20 seconds, and the hot air drying time to 10 seconds. Based on steps 1) to 9), the oil coating amount of the chrome-plated sheet was determined to be 3.7 mg / m². 2 .

[0082] As can be seen from the above-described apparatus, method, and embodiments, the fully automatic testing apparatus and method for determining the amount of oil applied to tin / chromium plate according to the present invention can operate fully automatically, reducing manual operation steps, greatly improving production efficiency, and well meeting the testing requirements of batch samples. During the sample cleaning process, the robotic arm clamps the sample throughout the process without changing its orientation, and the software precisely positions the sample during placement. Therefore, the fully automatic sample device can effectively ensure that the two measurements of ellipticity parameters are performed at the same position on the sample, reducing errors and greatly improving the accuracy of the measurement results. Furthermore, the present invention introduces correction coefficients for the elliptic polarization method and the hydrophilic balance method, correcting the differences between the calculated values ​​and the true values ​​of different mathematical models of the elliptic polarization method, further improving the accuracy of the results. In addition, the present invention replaces the toxic oil film cleaning agent with non-toxic anhydrous ethanol, and replaces the cleaning method with ultrasonic dissolution instead of steam dissolution, greatly reducing the pollution of the environment and the harm to human health caused by chemical reagents.

[0083] However, those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any changes or modifications to the above embodiments within the spirit and essence of this application will fall within the scope of the claims of this application.

Claims

1. A fully automatic testing device for determining the amount of oil applied to tin / chromium plate, comprising a horizontally placed fixed platform (1), characterized in that: The fixed platform (1) is a rectangular plate-shaped component made of aluminum. The middle area of ​​the fixed platform is hollowed out and a sample measuring platform (2) is opened there. An optical detection component (A) is connected and fixed on the fixed platform at the lower part of the sample measuring platform. An oil film cleaning device (3) is provided on the right side of the sample measuring platform. A waste sample collection frame (4) is provided near the bottom edge of the fixed platform of the oil film cleaning device. On the left side of the sample measuring table (2) and the right side of the oil film cleaning device (3) of the fixed table (1), a sample rack (5) is symmetrically arranged. The sample rack has several circular sample slots for placing the sample to be tested. An automatic sampling component (B) is provided in the upper area of ​​the fixed platform (1). The automatic sampling component is used to grab the sample to be tested on the sample holder (5) and transfer it to the sample measuring platform (2), the oil film cleaning device (3), or the waste sample collection box (4).

2. The fully automatic testing device for determining the amount of oil applied to tin / chrome plate as described in claim 1, characterized in that, The sample measuring stage (2) has a structure with a vertical through hole (2a) in the middle that passes through the fixed platform (1).

3. The fully automatic testing device for determining the amount of oil applied to tin / chrome plate as described in claim 1, characterized in that, The optical detection assembly (A) includes a detection cover (A1), a detection light source (A2), and an optical detector (A3). The detection cover is an opaque rectangular plate-shaped component. The middle of the top of the detection cover is fixedly connected to the sample measuring stage (2), and the bottom is fixedly connected to the fixed platform (1). The detection light source and the optical detector are respectively located below the fixed platform, and the working ends of the detection light source and the optical detector face the bottom of the sample measuring stage to perform optical detection on the sample to be tested placed on the sample measuring stage.

4. The fully automatic testing device for determining the amount of oil applied to tin / chrome plate as described in claim 1, characterized in that, The optical path of the detection light source (A2) of the optical detection component (A) is downward illumination, with an incident angle of 65°.

5. The fully automatic testing device for determining the amount of oil applied to tin / chrome plate as described in claim 1, characterized in that, The oil film cleaning device (3) includes a cleaning tank (3a), an ultrasonic generator (3b), and a hot air fan (3c). The cleaning tank is set on a fixed platform (1) and has a liquid level sensor inside. The cleaning tank is also equipped with an opening and closing sliding door (3a1). The ultrasonic generator is set below the cleaning tank, and the hot air fan is set above the cleaning tank.

6. The fully automatic testing device for determining the amount of oil applied to tin / chrome plate as described in claim 5, characterized in that, The sliding door (3a1) is made of transparent plexiglass and can cover the upper surface of the cleaning tank (3a). There are two hot air fans (3c), which are stacked one on top of the other. The hot air is blown at an angle of 45° to the upper and lower surfaces of the sample to be tested.

7. The fully automatic testing device for determining the amount of oil applied to tin / chrome plate as described in claim 1, characterized in that, The automatic sampling component (B) includes a guide rail (B1), a three-axis robotic arm (B2), and a mechanical clamp (B3). The guide rail is arranged horizontally in the upper area of ​​the fixed platform (1). The three-axis robotic arm is mounted on the guide rail so that it can move along the guide rail in the X, Y, and Z directions. The mechanical clamp is located at the end of the three-axis robotic arm. The mechanical clamp is made of non-wetting polytetrafluoroethylene and is used to grab the sample to be tested from the sample holder (5) to the sample measuring stage (2), the oil film cleaning device (3), or the waste sample collection box (4).

8. A fully automated test method for determining the amount of oil applied to a tin / chrome plate, comprising a fully automated test apparatus for determining the amount of oil applied to a tin / chrome plate according to any one of the preceding claims, the specific steps of which are as follows: 1) Place the sample to be tested on the sample holder (5); 2) The automatic sampling component (B) is activated, and its three-axis robotic arm (B2) and mechanical clamp (B3) grab the sample to be tested and place it horizontally on the sample measuring stage (2); 3) The detection light source (A2) of the optical detection component (A) is started, and the optical detector (A3) measures the elliptic parameters Ψ1 and Δ1 of the sample with oil film for the first time, that is, the amplitude information of the parameters related to the amplitude ratio of the p and s components before and after light reflection and the phase information of the parameters related to the phase difference of the p and s components before and after light reflection. 4) The automatic sampling component automatically grabs the sample into the cleaning tank (3a) of the oil film cleaning device (3), the ultrasonic generator (3b) cleans the oil film of the sample, and then the hot fan (3c) dries the sample. 5) The automatic sampling component automatically picks up the sample cleaned in step 4) and places it back onto the sample measuring stage; 6) The optical detection component performs a second measurement of the ellipticity parameters Ψ2 and Δ2 of the oil-free sample. Based on the first measurement of Ψ1 and Δ1 and the second measurement of Ψ2 and Δ2, the surface oil concentration is calculated from these two measurements of ellipticity parameters, in mg / m³. 2 ; 7) The automatic sampling component automatically grabs the sample and places it into the waste sample collection box (4), discarding the waste sample; 8) Select 1 to n groups of tin / chromium plate samples with different oil coating amounts. Take two samples from adjacent positions along the rolling direction for each group. For the first sample, determine the surface oil coating concentration (C11 to C1n) using the elliptic polarization method according to steps 1) to 7). For the second sample, determine the surface oil coating concentration (C21 to C2n) using the hydrophilic balance method. Combine the results of the two methods for this group of samples. 11 ~C 1n and C 21 ~C 2n Correlation analysis was performed, and the regression equation was obtained: C = b * C0 + a ... In the formula: C represents the actual concentration of the surface oil coating, in mg / m³. 2 ; C0 represents the surface oil concentration measured by an ellipsometry, in mg / m³. 2 ; b and a are regression coefficients; 9) Based on the formula in step 8), take the tin / chromium plate sample to be tested and determine the surface oil concentration C0 using elliptic polarization light method according to steps 1) to 7), in mg / m³. 2 The final calculated concentration C of the surface oil coating amount is in mg / m³. 2 .

9. The fully automated test method for determining the amount of oil applied to tin / chromium plate as described in claim 8, characterized in that, In step 1), the sample to be tested is specifically a tin / chromium plate processed into a circular sheet with a diameter of 50 mm.

10. The fully automated test method for determining the amount of oil applied to tin / chromium plate as described in claim 8, characterized in that, In step 4), the cleaning agent of the oil film cleaning device is anhydrous ethanol, and the cleaning agent must submerge the sample. The ultrasonic cleaning time is 10-20 seconds. A hot air fan is used to automatically dry the cleaning agent on the sample surface for 5-15 seconds.

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