A crystallizer gas sample sampling device

Abstract

The utility model relates to a kind of crystallizer gas sample sampling device, belong to metallurgical industry continuous casting production process auxiliary equipment technical field.The technical scheme is: containing metal handle (1), limiting silk (2), clamping spring (3) and gas sampler (4), the lower end of metal handle (1) and clamping spring (3) are fixedly connected together, gas sampler (4) is inserted into clamping spring (3), metal handle (1) is equipped with the limiting silk (2) matched with gas sampler (4);The limiting silk (2) is fixed on metal handle (1);The gas sampler (4) is vacuum glass tube, lower part is conical, and upper part is cylindrical;The limiting silk (2) is arranged perpendicularly with metal handle (1), and metal handle (1) is arranged parallelly with the center line of gas sampler (4).The utility model has the beneficial effects that: gas sampler can be accurately and quickly inserted into crystallizer steel liquid, sample quality is good, and detection accuracy is high.

Description

Technical Field

[0001] This utility model relates to a gas sampling device for crystallizers, belonging to the technical field of auxiliary equipment for continuous casting production processes in the metallurgical industry. Background Technology

[0002] For most steel grades, gaseous nitrogen is a harmful element, significantly impacting the mechanical properties of the steel. This adverse effect is particularly pronounced when producing ultra-low carbon steel under deep-drawing conditions. Increased nitrogen content in steel raises its yield strength, ultimate tensile strength, and hardness, while decreasing its plasticity, impact toughness, and age hardening. Nitrogen has high solubility in molten steel but very low solubility in solid iron. Therefore, at lower temperatures, nitrogen readily precipitates at grain boundaries, causing "cold brittleness" in the steel. Furthermore, nitrogen can combine with elements such as titanium and aluminum in the steel to form nitride inclusions, deteriorating the surface quality and reducing yield. Therefore, rapid analysis of nitrogen content in molten steel during the smelting process is crucial for determining and guiding the quality of subsequent products.

[0003] Currently, steel mills generally use the nitrogen content of molten steel in the continuous casting tundish or crystallizer as a representative indicator to measure the nitrogen content of the finished product. Because the nitrogen content of the gaseous molten steel in the crystallizer is closer to that of the finished product, most ultra-low carbon steel producers sample from inside the crystallizer. This is mainly done manually by holding a vacuum glass tube and inserting it into the molten steel. The high-temperature molten steel melts the head of the vacuum glass tube, drawing the molten steel into the tube. After cooling, a rod-shaped sample is formed, the surface is polished with sandpaper, and an ONH analyzer is used for quantitative analysis of the nitrogen content in the molten steel. During production, because there is a protective slag layer of about 3-7 cm thick on the surface of the molten steel in the crystallizer, operators need to manually hold the vacuum glass tube through the slag and insert it into the molten steel. Due to the varying thickness of the protective slag, sampling close to the molten steel is unsafe for operators. Furthermore, when casting in the tundish at a low position, the tundish car is low, and operators are prone to burns from sampling close to the tundish body. Therefore, how to safely and accurately extract high-quality gas samples from the crystallizer is crucial for the rapid and accurate detection of the nitrogen content in the gaseous molten steel. Utility Model Content

[0004] The purpose of this invention is to provide a gas sampling device for a crystallizer, which can accurately and quickly insert the gas sampler into the molten steel in the crystallizer, resulting in high sample quality and high detection accuracy, thus solving the problems existing in the background technology.

[0005] The technical solution of this utility model is:

[0006] A gas sampling device for a crystallizer includes a metal handle, a limiting wire, a clamping spring, and a gas sampler. The lower end of the metal handle is fixedly connected to the clamping spring, and the gas sampler is inserted into the clamping spring. The metal handle is provided with a limiting wire that cooperates with the gas sampler.

[0007] The gas sampler is a vacuum glass tube, with a conical lower part and a cylindrical upper part.

[0008] The outer diameter of the gas sampler is the same as the inner diameter of the clamping spring.

[0009] The limiting wire is fixed to the metal handle.

[0010] The limiting wire is arranged perpendicularly to the metal handle, and the metal handle is arranged parallel to the center line of the gas sampler.

[0011] The beneficial effects of this utility model are: it can accurately and quickly insert the vacuum glass tube gas sampler into the molten steel in the crystallizer, improve the success rate of gas sampling and sample quality, and ensure safe and reliable sampling, thus providing a strong guarantee for the detection of steel composition. Attached Figure Description

[0012] Figure 1 This is the front view of the present utility model;

[0013] Figure 2 This is a top view of the present invention;

[0014] Figure 3 This is a schematic diagram of a gas sampler.

[0015] Figure 4 This is a schematic diagram of the sampling structure inside the crystallizer;

[0016] In the diagram: 1. Metal handle; 2. Limiting wire; 3. Clamping spring; 4. Gas sampler; 5. Crystallizer; 6. Crystallizer protective slag; 7. Molten steel; 8. Upper edge of the copper plate of the crystallizer. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] See attached document Figure 1-4 A gas sampling device for a crystallizer includes a metal handle 1, a limiting wire 2, a clamping spring 3, and a gas sampler 4. The lower end of the metal handle 1 is fixedly connected to the clamping spring 3, and the gas sampler 4 is inserted into the clamping spring 3. The metal handle 1 is provided with a limiting wire 2 that cooperates with the gas sampler 4.

[0019] In this embodiment, refer to the appendix Figure 1-4 The gas sampling device mainly includes a metal handle 1, a limiting wire 2, a clamping spring 3, and a gas sampler 4, wherein:

[0020] The gas sampler 4 is a vacuum glass tube, conical at the bottom and cylindrical at the top, with a diameter of 0.8-1cm and a length of 7-10cm.

[0021] The inner diameter of the clamping spring 3 is the same as the outer diameter of the gas sampler 4, and the gas sampler 4 can be inserted into the clamping spring 3.

[0022] The limiting wire 2 is fixed on the metal handle 1. The limiting wire 2 is arranged perpendicular to the metal handle 1, and the metal handle 1 is arranged parallel to the center line of the gas sampler 4.

[0023] The metal limiting wire 2 determines the insertion depth of the gas sampler, ensuring sufficient intake of molten steel. Because the thickness of the protective slag inside the crystallizer is uneven, but the molten steel level is fixed, using the upper edge of the copper plate of the crystallizer as the limiting reference ensures that the insertion depth remains consistent at all times, guaranteeing accurate insertion and high-quality extraction of the gas sample.

[0024] During the middle stage of casting in the ultra-low carbon steel continuous casting furnace, when it is necessary to take gas samples from the molten steel 7 inside the crystallizer 5, the operator inserts the vacuum glass tube gas sampler 4 into the inner diameter of the clamping spring 3. Then, the operator holds the metal handle 1 of the sampler and inserts the vacuum glass tube gas sampler 4 into the protective slag 6 of the crystallizer. The vacuum glass tube gas sampler 4 passes through the protective slag 6 and enters the molten steel 7. When the limiting wire 2 contacts the upper edge 8 of the crystallizer 5, the insertion is stopped. At this time, 1-2 cm of the vacuum glass tube gas sampler 4 protrudes from the clamping spring 3 into the molten steel 7. It stays for 10-20 seconds, and then the metal handle 1 is squeezed out. After the metal rod inside the glass tube cools, the metal rod is knocked out. The inside of the metal rod is dense and the surface is smooth. A certain thickness of iron oxide scale is polished off with sandpaper, and the nitrogen content of the gas is tested. The gas sampling success rate is high, the sample has no sand holes on the inner and outer surfaces, the sampling is safe and reliable, and it provides a strong guarantee for the detection of steel composition.

Claims

1. A crystallizer gas sample sampling device, characterized by: It includes a metal handle (1), a limiting wire (2), a clamping spring (3) and a gas sampler (4). The lower end of the metal handle (1) and the clamping spring (3) are fixedly connected together. The gas sampler (4) is inserted into the clamping spring (3). The metal handle (1) is provided with a limiting wire (2) that cooperates with the gas sampler (4).

2. A crystallizer gas sampling device according to claim 1, wherein: The gas sampler (4) is a vacuum glass tube, with a conical lower part and a cylindrical upper part.

3. A crystallizer gas sampling device as defined in claim 2, wherein: The outer diameter of the gas sampler (4) is the same as the inner diameter of the clamping spring (3).

4. A crystallizer gas sampling device as defined in claim 1, wherein: The limiting wire (2) is fixed on the metal handle (1).

5. A crystallizer gas sampling device according to claim 1 or 4, wherein: The limiting wire (2) is arranged perpendicularly to the metal handle (1), and the metal handle (1) is arranged parallel to the center line of the gas sampler (4).

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