Sample preparation device and sample preparation method for testing chemical components of cast iron

Abstract

The invention belongs to the technical field of metal metallurgy, particularly relates to a sample preparation device for testing chemical components of cast iron, and further relates to a sample preparation method for testing stokehole chemical components of an iron casting by using the sample preparation device for testing the chemical components of the cast iron. According to the method, the thin circular truncated cone sheet-shaped sample can be simply, practically, efficiently and accurately manufactured, the operation safety risk of drilling cuttings and the like is avoided, the spectrum testing requirement can be met only through simple polishing and grinding, the risk of repeated sampling is avoided, the production rhythm can be accelerated, and the reliability of molten iron analysis can be greatly protected; the device is suitable for efficient and convenient sampling, sample preparation and testing of stokehole chemical components of iron castings.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgy, and in particular relates to a sample preparation device for cast iron chemical composition testing, and also relates to a sample preparation method for furnace-front chemical composition testing of cast iron parts using the sample preparation device for cast iron chemical composition testing. Background Art

[0002] During routine smelting production, to avoid lengthy wait times for compositional results, molten iron composition changes within the furnace often differ significantly from test results. Spectroscopic analysis of chemical elements is often used for pre-furnace chemical composition testing. However, spectral analysis often yields inaccurate carbon and sulfur measurements. To compensate for these discrepancies, white cast iron samples must be cast and drill cuttings sampled for testing. This requires two sets of sample preparation fixtures and multiple sampling and preparation steps to obtain a sample. Due to the hardness of the sample material and the rapid drilling of the cuttings, the resulting scrap samples often turn blue, resulting in burnout of carbon and sulfur, inaccurate composition and affecting pre-furnace composition results. The sample preparation process also requires manual handling of the sample, which carries the risk of scrap flying and sample loss, posing a risk of operator injury. The sample testing process also places high demands on the tester, requiring manual screening and determination of sample compliance. If a sample does not meet the test requirements, it must be returned to the production site for resampling. This results in a relatively unstable and inefficient compositional testing process.

[0003] Therefore, it is necessary to design a sample preparation device that can overcome the pain points encountered in the above production and ensure that the sample preparation is cooled fast enough, thin enough, and the sample preparation quality is high enough. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a sample preparation device for cast iron chemical composition testing, so as to solve the problems of the existing "white cast iron samples dedicated to carbon and sulfur testing" and spectral samples, such as cumbersome sample preparation operation, poor sample preparation quality, and unsafe sample preparation operation.

[0005] Another object of the present invention is to provide a sample preparation method for furnace-front chemical composition testing of cast iron parts using the sample preparation device for cast iron chemical composition testing.

[0006] To achieve the above objectives, the solutions adopted by the present invention are as follows:

[0007] In a first aspect, the present invention provides a sample preparation device for testing the chemical composition of cast iron, comprising an upper leaf structure and a lower leaf structure, wherein one side of the upper leaf structure and one side of the lower leaf structure are hingedly connected by a rotating shaft to form an openable and closable structure, the upper leaf structure comprises an upper leaf metal sheet arranged at the bottom, the lower leaf structure comprises a lower leaf metal sheet arranged at the top, and a circular groove is provided in the middle portion of the lower leaf metal sheet for casting casting samples.

[0008] Preferably, the upper leaf structure further includes a handle provided at the top for opening and closing.

[0009] Preferably, the upper leaf metal sheet and the lower leaf metal sheet are both copper metal sheets.

[0010] Preferably, the sample preparation device is in the shape of a square or a shell fan.

[0011] Preferably, the circular groove is a stepped circular groove, comprising a circular groove body and an annular groove located at the circumferential edge of the circular groove body with a diameter larger than that of the circular groove body. The circular groove body is a cylinder or an inverted frustum with a top diameter slightly larger than the bottom diameter.

[0012] Preferably, the upper leaf structure includes an upper leaf body and an upper leaf metal sheet arranged at the bottom of the upper leaf body, and the lower leaf structure includes a lower leaf body and a lower leaf metal sheet arranged at the top of the lower leaf body. When the upper leaf structure and the lower leaf structure are closed, the upper leaf metal sheet and the lower leaf metal sheet are in contact with each other.

[0013] Preferably, the upper blade metal sheet is fixed to the bottom of the upper blade body, and a fixing method is selected from any one of bonding, welding and fastener connection.

[0014] Preferably, the upper leaf body includes a retaining ring located around the outer edge to prevent personal injury caused by splashing of molten iron during sample preparation.

[0015] Preferably, when the upper leaf structure and the lower leaf structure are closed, the retaining ring of the upper leaf body is located outside the lower leaf body.

[0016] Preferably, a body groove is provided in the middle of the lower blade body, and the lower blade metal sheet is detachably placed in the body groove.

[0017] In a second aspect, the present invention further provides a method for preparing samples for testing the chemical composition of cast iron parts before furnace operation using the sample preparation device for testing the chemical composition of cast iron as described above, comprising the following steps:

[0018] Step (1), taking a spoonful of molten iron and pouring it into the circular groove of the lower leaf metal sheet of the lower leaf structure of the above-mentioned sample preparation device, the molten iron flows into the circular groove and slightly overflows the edge of the circular groove main body of the lower leaf metal sheet and flows into the annular groove;

[0019] Step (2) is to close the upper leaf structure of the sample preparation device with the lower leaf structure by means of a handle, and to press downward with force so that the upper leaf metal sheet and the lower leaf metal sheet are closely fitted together, thereby accelerating the cooling and solidification of the molten iron and ensuring that the edge molten iron is pressed into a thin iron sheet. In this process, the molten iron splashes onto the retaining ring of the upper leaf structure of the sample preparation device, thereby preventing the molten iron from splashing out and scalding the operator;

[0020] Step (3), the sample cools and solidifies into a cast iron sample within about 5-10 seconds, and the handle is pulled up to turn on the sample preparation device;

[0021] Step (4), first remove the lower leaf metal sheet from the body groove in the middle of the lower leaf body, and then remove the cooled cast iron sample from the circular groove of the lower leaf metal sheet;

[0022] Step (5), breaking or crushing the white iron sheet around the sample to obtain a thin frustum sample, the surface of which is simply polished and smoothed, thus making a sample that meets the test requirements of the carbon and sulfur analyzer;

[0023] Step (6): finally, clean the surface of the sample preparation device and the splashed molten iron around it, assemble the lower leaf metal sheet, and prepare for the next sample preparation;

[0024] Step (7), repeat the above steps, and continuously prepare samples for furnace chemical composition testing of cast iron parts according to production.

[0025] Beneficial effects

[0026] The sample preparation device and sample preparation method for cast iron chemical composition testing provided by the present invention can simply, practically, efficiently and accurately prepare thin frustum-shaped sheet samples, avoiding operational safety risks such as drilling chips, and can meet spectral testing requirements through simple polishing, avoiding the risk of repeated sampling, speeding up the production rhythm, and protecting the reliability of molten iron analysis to the greatest extent. It is suitable for efficient and convenient sampling, sample preparation and testing of the chemical composition of cast iron parts in front of the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic structural diagram of a sample preparation device for testing the chemical composition of cast iron.

[0028] Figure 2 The present invention is a schematic structural diagram of a sample preparation device for testing the chemical composition of cast iron in an open state.

[0029] Figure 3 The present invention is a schematic structural diagram of a sample preparation device for testing the chemical composition of cast iron in a closed state.

[0030] Figure 4 The present invention is a schematic structural diagram of the sampling operation of a sample preparation device for testing the chemical composition of cast iron. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0036] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] To this end, the following solutions are proposed:

[0038] See also Figure 1 The present invention provides a sample preparation device for cast iron chemical composition testing, including an upper leaf structure 100 and a lower leaf structure 200. One side of the upper leaf structure 100 and one side of the lower leaf structure 200 are hinged by a rotating shaft 300 to form an openable and closable structure. The upper leaf structure 100 includes an upper leaf metal sheet 101 arranged at the bottom, and the lower leaf structure 200 includes a lower leaf metal sheet 201 arranged at the top. A circular groove 202 is provided in the middle portion of the lower leaf metal sheet 201 for casting casting samples.

[0039] As a specific embodiment, according to the solution of the present invention, when preparing the test sample, the sample preparation device for the chemical composition test of cast iron of the present invention is first placed in the following position: Figure 2 The open state is shown, and then the molten iron sample obtained from the smelting production process is poured into the circular groove 202 to form a cast casting sample.

[0040] In some embodiments, in order to facilitate the sample preparation device for cast iron chemical composition testing of the present invention to be in an open state, the upper leaf structure 100 further includes a handle 102 disposed on the top for opening and closing.

[0041] As a specific embodiment, according to the solution of the present invention, when preparing the test sample, after the molten iron sample is poured into the circular groove 202, the step of closing the upper leaf structure 100 of the sample preparation device with the lower leaf structure 200 through the handle 102 is further included, so that the sample preparation device for the chemical composition test of cast iron of the present invention is in the following position: Figure 3 The closed state is shown, and the upper leaf metal sheet 101 and the lower leaf metal sheet 201 are attached to each other, and the molten iron poured in the circular groove 202 of the lower leaf metal sheet 201 contacts the upper leaf metal sheet 101 and cools to form a cast casting sample.

[0042] In some embodiments, in order to facilitate rapid cooling of the molten iron poured into the circular groove 202 of the lower leaf metal sheet 201, the upper leaf metal sheet 101 and the lower leaf metal sheet 201 are both copper metal sheets, and can also be other known metal materials that can cool molten iron.

[0043] In some embodiments, the shape of the sample preparation device can be square or shell fan-shaped. In the drawings of the present invention, the sample preparation devices are all square.

[0044] In some embodiments, due to the common edge phenomenon produced by molten iron during the pouring process, the circular groove 202 located on the lower leaf metal sheet 201 is designed as a stepped circular groove, including a circular groove main body 202a and an annular groove 202b located on the circumferential edge of the circular groove main body 202a and having a larger diameter than the circular groove main body 202a, wherein the circular groove main body 202a can be a cylinder or an inverted truncated cone shape with a top diameter slightly larger than a bottom diameter, so that the molten iron can be poured out from the circular groove 202 after cooling and forming. The formed cast iron sample is a thin truncated cone-shaped truncated cone specimen, and there is a circle of white thin iron sheet around the specimen. The thin truncated cone specimen after the surrounding circle of white thin iron sheet is broken or crushed can meet the test requirements of the carbon-sulfur analyzer and can avoid the safety risks of operations such as drilling cuttings.

[0045] In some embodiments, in the sample preparation device for cast iron chemical composition testing provided by the present invention, the upper leaf structure 100 includes an upper leaf body 103 and an upper leaf metal sheet 101 fixed to the bottom of the upper leaf body 110, and the lower leaf structure 200 includes a lower leaf body 203 and a lower leaf metal sheet 201 arranged at the top of the lower leaf body 210. When the upper leaf structure 100 and the lower leaf structure 200 are closed, the upper leaf metal sheet 101 and the lower leaf metal sheet 201 are in contact with each other.

[0046] In some embodiments, the upper blade body 103 and the upper blade metal sheet 101 may be fixed together by bonding, welding, or fastener connection.

[0047] Furthermore, the upper blade body 103 includes a retaining ring 104 located around its outer edge to prevent molten iron splashing during sample preparation and causing personal injury. In some embodiments, when the upper blade structure 100 and the lower blade structure 200 are closed, the retaining ring 104 of the upper blade body 103 is located outside the lower blade body 203.

[0048] Furthermore, a body groove 204 is provided in the middle of the lower blade body 203 , and the lower blade metal sheet 201 is located in the body groove 204 .

[0049] In some embodiments, according to the solution of the present invention, when making test samples, in order to facilitate the pouring of molten iron from the circular groove 202 after it is cooled and formed, the lower leaf metal sheet 201 is designed to be detachable. Figure 4 As shown, after the molten iron is cooled and formed in the circular groove 202, the lower leaf metal sheet 201 is first taken out from the body groove 204 in the middle of the lower leaf body 203, and then the cooled and formed cast iron sample is taken out from the circular groove 202 of the lower leaf metal sheet 201.

[0050] The present invention further provides a method for sampling and preparing a sample for testing the chemical composition of a cast iron part before furnace operation using the above-mentioned sample preparation device, comprising the following steps:

[0051] Step (1): take a spoonful of molten iron and pour it into the circular groove 202 of the lower leaf metal sheet 201 of the lower leaf structure 200 of the above-mentioned sample preparation device. The molten iron flows into the circular groove 202 and slightly overflows the edge of the circular groove body 202a of the lower leaf metal sheet 201 and flows into the annular groove 202b.

[0052] Step (2) is to close the upper leaf structure 100 of the sample preparation device with the lower leaf structure 200 through the handle 102, and press downward with force to make the upper leaf metal sheet 101 and the lower leaf metal sheet 201 fit tightly together, accelerate the cooling and solidification of the molten iron, and ensure that the edge of the molten iron is pressed into a thin iron sheet. In this process, the molten iron splashes onto the retaining ring 104 of the upper leaf structure 100 of the above-mentioned sample preparation device to prevent the molten iron from splashing out and scalding the operator;

[0053] Step (3): The sample is cooled and solidified into a cast iron sample A within about 5-10 seconds, and the handle 102 is pulled up to turn on the sample preparation device.

[0054] Step (4): first remove the lower blade metal sheet 201 from the body groove 204 in the middle of the lower blade body 203, and then remove the cooled cast iron sample A from the circular groove 202 of the lower blade metal sheet 201;

[0055] Step (5), breaking or crushing the white iron sheet around the sample to obtain a thin frustum sample, the surface of which is simply polished and smoothed, thus making a sample that meets the test requirements of the carbon and sulfur analyzer;

[0056] Step (6): finally, clean the surface of the sample preparation device and the splashed molten iron around it, assemble the lower leaf metal sheet 201, and prepare for the next sample preparation;

[0057] Step (7), repeat the above steps, and continuously prepare samples for furnace chemical composition testing of cast iron parts according to production.

[0058] The sample preparation device and sample preparation method for cast iron chemical composition testing provided by the present invention can be simple, practical, efficient and accurate in producing thin truncated cone sheet samples, avoiding operational safety risks such as drilling cuttings, and can meet spectral testing requirements by simple polishing. Tooling can also be designed accordingly to achieve machine polishing, thereby improving sample quality and the accuracy of test data. The sample preparation method of the present invention is simple and convenient, abandoning the cumbersome operation methods and processes of traditional sampling and sample preparation, and is safe and reliable, avoiding the risk of repeated sampling, and can speed up the production rhythm. The overall time from sampling to the end of testing can be reduced by 5 to 10 minutes, and the idle waiting time of repeated sampling and sample preparation due to unqualified sample preparation is avoided, which can greatly protect the reliability of molten iron analysis and is suitable for efficient and convenient sampling, sample preparation and testing of the chemical composition of cast iron parts in front of the furnace.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sample preparation device for cast iron chemical composition testing, characterized in that: It includes an upper leaf structure and a lower leaf structure. One side of the upper leaf structure and one side of the lower leaf structure are hinged by a rotating shaft to form an openable and closable structure. The upper leaf structure includes an upper leaf metal sheet arranged at the bottom, and the lower leaf structure includes a lower leaf metal sheet arranged at the top. A circular groove is provided in the middle of the lower leaf metal sheet for casting casting samples.

2. The sample preparation device for cast iron chemical composition testing according to claim 1, characterized in that: The upper leaf structure further includes a handle arranged on the top for opening and closing.

3. The sample preparation device for cast iron chemical composition testing according to claim 1, characterized in that: The upper leaf metal sheet and the lower leaf metal sheet are both copper metal sheets.

4. The sample preparation device for cast iron chemical composition testing according to claim 1, characterized in that: The shape of the sample preparation device is square or shell fan-shaped.

5. The sample preparation device for cast iron chemical composition testing according to claim 1, characterized in that: The circular groove is a stepped circular groove, comprising a circular groove body and an annular groove located on the circumferential edge of the circular groove body with a diameter larger than that of the circular groove body. The circular groove body is a cylinder or an inverted truncated cone with a top diameter slightly larger than the bottom diameter.

6. The sample preparation device for cast iron chemical composition testing according to claim 1, characterized in that: The upper leaf structure includes an upper leaf body and an upper leaf metal sheet arranged at the bottom of the upper leaf body, and the lower leaf structure includes a lower leaf body and a lower leaf metal sheet arranged at the top of the lower leaf body. When the upper leaf structure and the lower leaf structure are closed, the upper leaf metal sheet and the lower leaf metal sheet are in contact with each other.

7. The sample preparation device for cast iron chemical composition testing according to claim 6, characterized in that: The upper blade metal sheet is fixed to the bottom of the upper blade body, and a fixing method is selected from any one of bonding, welding and fastener connection.

8. The sample preparation device for cast iron chemical composition testing according to claim 6, characterized in that: The upper leaf body includes a retaining ring located around the outer edge, which is used to prevent molten iron from splashing during the sample preparation process and causing personal injury.

9. The sample preparation device for cast iron chemical composition testing according to claim 8, characterized in that: When the upper leaf structure and the lower leaf structure are closed, the retaining ring of the upper leaf body is located outside the lower leaf body.

10. The sample preparation device for cast iron chemical composition testing according to claim 6, characterized in that: A body groove is provided in the middle of the lower leaf body, and the lower leaf metal sheet is detachably placed in the body groove.

11. A method for preparing samples for chemical composition testing of cast iron parts before furnace using the sample preparation device for chemical composition testing of cast iron according to any one of claims 1 to 10, characterized in that: The steps include: Step (1), taking a spoonful of molten iron and pouring it into the circular groove of the lower leaf metal sheet of the lower leaf structure of the above-mentioned sample preparation device, the molten iron flows into the circular groove and slightly overflows the edge of the circular groove main body of the lower leaf metal sheet and flows into the annular groove; Step (2) is to close the upper leaf structure of the sample preparation device with the lower leaf structure by means of a handle, and to press downward with force so that the upper leaf metal sheet and the lower leaf metal sheet are closely fitted together, thereby accelerating the cooling and solidification of the molten iron and ensuring that the edge molten iron is pressed into a thin iron sheet. In this process, the molten iron splashes onto the retaining ring of the upper leaf structure of the sample preparation device, thereby preventing the molten iron from splashing out and scalding the operator; Step (3), the sample cools and solidifies into a cast iron sample within about 5-10 seconds, and the handle is pulled up to turn on the sample preparation device; Step (4), first remove the lower leaf metal sheet from the body groove in the middle of the lower leaf body, and then remove the cooled cast iron sample from the circular groove of the lower leaf metal sheet; Step (5), breaking or crushing the white iron sheet around the sample to obtain a thin frustum sample, the surface of which is simply polished and smoothed, thus making a sample that meets the test requirements of the carbon and sulfur analyzer; Step (6): finally, clean the surface of the sample preparation device and the splashed molten iron around it, assemble the lower leaf metal sheet, and prepare for the next sample preparation; Step (7), repeat the above steps, and continuously prepare samples for furnace chemical composition testing of cast iron parts according to production.

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