Accurate and safe crystallizer casting powder suction device and method

Abstract

The accurate and safe crystallizer casting powder suction device comprises an L-shaped transparent suction pipe, a rubber suction ball, a transverse limiting stopper, a handheld rod and a height limiting stopper, the rubber suction ball is connected to one end of the L-shaped transparent suction pipe, and scales are arranged on the pipe wall of the other end of the L-shaped transparent suction pipe; the height limiter is installed on the pipe wall of the end, provided with scales, of the L-shaped transparent suction pipe, the handheld rod and the rubber suction ball are installed on the same side and fixed to the inner side of the rubber suction ball, the transverse limiter is installed on the inner side of the handheld rod, and the transverse limiter is in sliding connection with the L-shaped transparent suction pipe; and the height limiter can also move relative to the L-shaped transparent suction tube. The device overcomes the defects in the prior art, realizes safe and effective sampling of crystallizer casting powder in a continuous casting process, further accurately detects and analyzes physical index changes of the casting powder, and provides powerful support for optimization of a continuous casting process and improvement of product quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel metallurgy, and particularly relates to a precise and safe crystallizer protective slag suction device and method. BACKGROUND

[0002] The function requirements of continuous casting protective slag generally include: air insulation, preventing secondary oxidation of molten steel; heat insulation, reducing heat loss of molten steel; absorbing non-metallic inclusions floating in molten steel; controlling heat transfer of the crystallizer; lubricating the cast blank to prevent sticking and leakage, etc. The state and performance of the protective slag directly affect the production stability of the continuous casting process and the product quality. Therefore, it is particularly important for safety production to sample the protective slag in the production process, analyze various indexes such as melting point and melting speed, and monitor the state, which is also more conducive to the production of high-quality steel.

[0003] At present, the sampling method of the protective slag is to use a sampling spoon to fish the slag at the end of pouring. If the slag is fished and sampled during the continuous casting process, it will cause liquid level fluctuation, which has a great influence on the continuous pouring process. The sampling analysis of this method can only detect various physical property indexes of the protective slag after the continuous casting is completed, and cannot detect the process slag sample. However, the performance of the protective slag is in dynamic change during the continuous casting process. From the start of pouring to the normal casting, and then to the fast change of the crystallizer and the end of the casting, the melting behavior, composition change and interaction with the molten steel of the protective slag all have significant differences. These process changes have a crucial influence on the quality of the cast blank, such as the rapid and uniform melting and spreading ability of the protective slag at the start of pouring, which directly determines the formation quality of the initial lubricating film between the crystallizer and the cast blank; when the crystallizer is quickly changed, whether the protective slag can quickly adapt to the new working condition and continue to play a good lubricating and heat transfer role also relates to the surface quality of the cast blank and the production continuity. Therefore, the data obtained by the traditional end-pouring sampling method cannot fully reflect the real performance of the protective slag in the continuous casting process, and cannot provide timely and accurate basis for process optimization. SUMMARY

[0004] The purpose of the present application is to provide a precise and safe crystallizer protective slag suction device and method, which overcomes the shortcomings of the prior art, realizes safe and effective sampling of the crystallizer protective slag in the continuous casting process, and then accurately detects and analyzes the changes of the physical property indexes of the protective slag, thereby providing strong support for continuous casting process optimization and product quality improvement.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: A precise and safe crystallizer protective slag suction device, comprising an L-shaped transparent suction pipe, a rubber suction ball, a transverse limiter, a handheld rod, a height limiter, the rubber suction ball is connected to one end of the L-shaped transparent suction pipe, a scale is arranged on the pipe wall of the other end of the L-shaped transparent suction pipe, the height limiter is installed on the pipe wall of the end of the L-shaped transparent suction pipe provided with the scale, the handheld rod is installed and fixed on the inner side of the rubber suction ball on the same side of the rubber suction ball, the transverse limiter is installed on the inner side of the handheld rod, and the transverse limiter is in sliding connection with the L-shaped transparent suction pipe, and the height limiter can also be relatively displaced with the L-shaped transparent suction pipe.

[0006] Further, the transverse limiter comprises a sliding sleeve, a plumb bob and a pull rod, the plumb bob is connected below the sliding sleeve through a soft rope, the sliding sleeve is sleeved on the L-shaped transparent suction pipe, and the pull rod is fixedly connected with the sliding sleeve.

[0007] Further, the height limiter comprises a sliding pipe, a positioning clamp, a connecting rod and a floating ball, the connecting rod is in right angle shape, the floating ball is connected with one end of the connecting rod, the other end of the connecting rod is fixedly connected with the sliding pipe in perpendicular, the sliding pipe is in sliding sleeve connection with the L-shaped transparent suction pipe, and the positioning clamp is fixed on the L-shaped transparent suction pipe below the sliding pipe.

[0008] Still further, the floating ball is made of MgO-C, Al2O3-C or ZrO2-C based refractory material, or Al2O3-SiC-C or MgO-CaO-ZrO composite refractory material.

[0009] Further, the height position of the positioning clamp is that when the sliding pipe is clamped on the positioning clamp, the floating ball is in consistent height with the end of the L-shaped transparent suction pipe.

[0010] Further, the sampling end of the L-shaped transparent suction pipe is a beveled tip.

[0011] A use method of a precise and safe crystallizer protective slag suction device, specifically comprising the following method steps: 1) vertically fixing a baffle support at a safe position away from the crystallizer as a sampling position safety scale; 2) holding the handheld rod to pull the transverse limiter to a set position, at this time, the distance between the set position and the right angle of the L-shaped transparent suction pipe is equal to the sum of the distance from the slag sampling position of the crystallizer to the edge of the crystallizer and the distance from the baffle support to the edge of the crystallizer, so that the plumb bob on the transverse limiter is hung down along one side of the baffle support; 3) First, squeeze the air in the rubber suction ball, and then vertically insert the L-shaped transparent suction pipe from above the crystallizer. With the insertion of the L-shaped transparent suction pipe into the mold flux layer, the floating ball of the height limiter floats upward due to the buoyancy of the molten steel. When the sliding tube of the height limiter slides upward to the set height, the insertion is stopped. The mold flux is sucked into the L-shaped transparent suction pipe through the negative pressure generated by the rubber suction ball, and the suction amount is determined by the scale on the L-shaped transparent suction pipe. 4) The positioning clamp of the height limiter is used to limit the sliding tube, so that the sliding tube does not fall off the L-shaped transparent suction pipe.

[0012] Compared with the prior art, the beneficial effects of the present application are: The crystallizer mold flux suction device and method provided by the present application solves the technical problem of mold flux sampling in the continuous casting process. Compared with the traditional mold flux sampling method, the device and method can effectively avoid disturbance to the liquid surface of the crystallizer, greatly ensuring the stability and continuity of the continuous casting process, and providing reliable protection for efficient and high-quality continuous casting production. In addition, the sampling tube of the device adopts a unique right-angle bend design, and a safety position scale is provided, so that a safety distance buffer zone is formed between the sampling personnel and the crystallizer; in combination with a standardized and rigorous sampling process, the personal safety of the sampling personnel is guaranteed in multiple dimensions from the equipment structure to the operation specification, and the safety in the continuous casting production process is significantly improved. At the same time, the sampling position and the sampling height in the slag layer can be accurately controlled, standard samples are provided for detection and inspection, and effective data are provided for process parameters. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The figure is a structural schematic diagram of the present application.

[0014] In the figure: 1, pull rod; 2, rubber suction ball; 3, connecting rod; 4, sliding sleeve; 5, scale; 6, floating ball; 7, sliding tube; 8, positioning clamp; 9, sinker; 10, hand rod; 11, L-shaped transparent suction pipe; 12, baffle support. DETAILED DESCRIPTION

[0015] The specific embodiments of the present application will be further described below in combination with the drawings.

[0016] As Figure 1As shown, a precise and safe crystallizer protective slag suction device includes an L-shaped transparent suction pipe 11, a rubber suction ball 2, a transverse limiter, a handheld rod 10, and a height limiter. The rubber suction ball 2 is connected to one end of the L-shaped transparent suction pipe 11. A scale 5 is arranged on the pipe wall of the other end of the L-shaped transparent suction pipe 11. The height limiter is installed on the pipe wall of the end of the L-shaped transparent suction pipe 11 provided with the scale 5. The handheld rod 10 is installed on the same side of the rubber suction ball 2 and fixed to the inner side of the rubber suction ball 2. The transverse limiter is installed on the inner side of the handheld rod 10 and slidably connected with the L-shaped transparent suction pipe 11. The height limiter can also be displaced relative to the L-shaped transparent suction pipe 11.

[0017] Further, the transverse limiter includes a sliding sleeve 4, a sinker 9, and a pull rod 1. The sinker 9 is connected to the lower side of the sliding sleeve 4 through a soft rope. The sliding sleeve 4 is sleeved on the L-shaped transparent suction pipe 11. The pull rod 1 is fixedly connected with the sliding sleeve 4.

[0018] Further, the height limiter includes a sliding pipe 7, a positioning clamp 8, a connecting rod 3, and a float ball 6. The connecting rod 3 is in a right angle shape. The float ball 6 is connected with one end of the connecting rod 3. The other end of the connecting rod 3 is fixedly connected with the sliding pipe 7 perpendicularly. The sliding pipe 7 is slidably sleeved with the L-shaped transparent suction pipe 11. The positioning clamp 8 is fixed on the L-shaped transparent suction pipe 11 at the lower part of the sliding pipe 7.

[0019] Further, the float ball 6 is made of MgO-C, Al2O3-C, or ZrO2-C based refractory material or Al2O3-SiC-C or MgO-CaO-ZrO composite refractory material.

[0020] The float ball 6 is made of MgO-C, Al2O3-C, or ZrO2-C based refractory material. The reason for the selection of the material is that graphite (C) can significantly reduce the wettability of the slag and form an inert interface layer. MgO or Al2O3 reacts with the liquid slag to form a high-melting-point phase (such as MgO·Al2O3 spinel), which prevents slag penetration. ZrO2 is chemically inert and almost does not react with CaO-SiO2-Al2O3 slag, and has a high melting point (2700℃) to resist high-temperature slag erosion.

[0021] Since the density of the liquid slag layer is 2.0-2.3 g / cm 3 (contains Li2O, Na2O), 2.8-3.2 g / cm 3 (contains BaO, CaF2), the average density is 2.2-2.8 g / cm 3 , the density of MgO-C refractory is 2.8-3.1 g / cm 3 , the density of Al2O3-C refractory is 2.9-3.2 g / cm 3ZrO2-C refractory density 3.5~4.0g / cm 3 Therefore, the magnesium-alumina refractory can be made into solid, and the zirconia refractory can be made into hollow material, and the suspension position is controlled by the buoyancy of the molten steel. Or composite refractory such as Al2O3-SiC-C (density 2.7~3.1g / cm 3 ) or MgO-CaO-ZrO2 (density 3.2~3.8g / cm 3 ) is used.

[0022] The height position of the positioning clamp 8 is that when the sliding tube 7 is clamped on the positioning clamp 8, the floating ball 6 is consistent with the height of the end of the L-shaped transparent suction tube 11.

[0023] The height limiter is wound by the metal sliding tube 7 around the vertical surface of the sampling end of the L-shaped transparent suction tube 11, and the whole height limiter is in a freely movable state. The positioning clamp 8 is fixed with the L-shaped transparent suction tube 11 and is used for positioning the sliding tube 7 to prevent the sliding tube 7 from falling off the L-shaped transparent suction tube 11. The sampling end of the L-shaped transparent suction tube 11 is provided with a scale 5, which is used to measure the suction amount of the protective slag and the height position of the sampling point in the slag layer. The rising height of the floating ball 6 is the sampling height of the slag layer.

[0024] The L-shaped transparent suction tube 11 is carefully made of quartz material into a right-angle long tube structure, and the sampling end is designed as a beveled tip. The tip structure can greatly reduce the resistance when inserting into the protective slag layer, and can effectively avoid the violent disturbance to the liquid level of the crystallizer, so as to ensure the smooth and accurate sampling process. At the same time, the sampling tube adopts a right-angle shape, and the sampling end is arranged vertically, and the negative pressure end is in the horizontal plane. Such design can keep a safe distance between the sampling personnel and the crystallizer during operation, and builds a safety line for sampling operation from the structure design level, and fully guarantees the personal safety of the sampling personnel.

[0025] The negative pressure end of the L-shaped transparent suction tube 11 is tightly connected with the rubber suction ball 2. By means of the simple and easy-to-control operation mode of manually extruding the rubber suction ball 2, the negative pressure required for sucking the protective slag of the crystallizer can be quickly generated. The device not only has simple and smooth operation process, but also can realize accurate adjustment of the suction amount by means of force control, greatly improves the sampling efficiency, and ensures that the sampling result has high accuracy and reliability, and lays a solid foundation for subsequent detection and analysis work.

[0026] The connecting hand-held rod 10 is extended transversely from the negative pressure end, which conforms to the ergonomic design and is convenient for the operator to hold with hand during sampling, further enhances the stability of the sampler, and makes the sampling process more easy and efficient.

[0027] A use method of the precise and safe protective slag suction device of the crystallizer, specifically includes the following method steps: 1) Fix a baffle bracket 12 vertically at a safe distance from the crystallizer as a safety ruler for sampling position. The baffle bracket 12 is used to set a safe sampling position to ensure safe sampling operation.

[0028] 2) Pull the lateral limiter to the set position with the handheld rod 10, at which time the distance between the set position and the right angle of the L-shaped transparent suction pipe 11 is equal to the sum of the distance from the slag sampling position of the crystallizer to the edge of the crystallizer and the distance from the baffle bracket 12 to the edge of the crystallizer, so that the weight 9 on the lateral limiter hangs on one side of the baffle bracket 12. The setting of the weight 9 can ensure that the L-shaped transparent suction pipe 11 can be vertically inserted into the slag layer of the crystallizer.

[0029] 3) First, squeeze out the air in the rubber suction ball 2, and then vertically insert the L-shaped transparent suction pipe 11 from above into the crystallizer. As the L-shaped transparent suction pipe 11 is inserted into the protective slag layer, the float ball 6 of the height limiter floats upward due to the buoyancy of the molten steel, and when the sliding tube 7 of the height limiter slides upward to the set height, the insertion is stopped. Make a clear mark at the set height for remote observation. The protective slag is sucked into the L-shaped transparent suction pipe 11 by the negative pressure generated by the rubber suction ball 2, and the amount of suction is determined by the scale 5 on the L-shaped transparent suction pipe 11.

[0030] 4) The positioning clamp 8 of the height limiter is used to limit the sliding tube 7 so that the sliding tube 7 does not fall off the L-shaped transparent suction pipe 11.

[0031] After sampling, the sampling device is lifted smoothly away from the crystallizer and placed on a safe and stable operation platform. The protective slag sample at the sampling end is taken out and transferred to a special sample collection container. The sample is immediately numbered, and the sampling time, specific sampling position, and continuous casting process parameters (such as pouring temperature, drawing rate, etc.) are recorded in detail. Subsequently, systematic physical property detection and analysis of the collected samples will be carried out, including melting point determination, melting rate test, and chemical composition analysis, etc. to provide scientific basis for the optimization and adjustment of continuous casting production process Example: In the continuous casting production line of the third continuous casting workshop of a certain steel plant, the practical application of the crystallizer protective slag suction device and method of the present application is carried out for the continuous casting production process of a certain type of medium carbon steel.

[0032] I. Device preparation and debugging: 1. Before installation, test the air tightness of the entire device. Immerse the sampling end of the L-shaped transparent suction pipe 11 in water, squeeze the rubber suction ball 2 at the negative pressure end, and observe that only uniform and small bubbles are generated. Confirm that there is no leakage before use.

[0033] II. Sampling process: 1. When the continuous casting machine is in a stable casting state, the withdrawal rate is 1.2 m / min, and the casting temperature is stabilized at 1540℃, the operator wears high-temperature resistant gloves and protective masks, and takes the sample at the stable area of the liquid surface of the crystallizer.

[0034] 2. The operator uses both hands to hold the hand-held rod 10, slowly and vertically positions the L-shaped transparent suction pipe 11 above the sampling point (the operation can be positioned in the horizontal distance and verticality through the horizontal limiter and baffle support 12), squeezes the rubber suction ball 2 to compress about 80% of the volume with the other hand, so that it is in a negative pressure state, then inserts the L-shaped transparent suction pipe 11 into the protective slag layer, and when the sliding pipe 7 reaches the sampling height scale value, the stabilizing device is stable.

[0035] 3. Slowly release the rubber suction ball 2, and the protective slag is smoothly sucked into the L-shaped transparent suction pipe 11.

[0036] Three, sample processing and analysis: 1. After sampling is completed, the operator smoothly lifts the sampling device away from the crystallizer and places it on the operation table with a heat insulation layer. Use special tools to carefully remove the protective slag sample in the L-shaped transparent suction pipe 11 and transfer it to a pre-prepared sealed sample collection bottle.

[0037] 2. Number the sample, and record the continuous casting process parameters: casting temperature 1540℃, withdrawal rate 1.2 m / min, and crystallizer vibration frequency 150 times / min.

[0038] 3. Send the sample to the laboratory for physical property detection analysis, including melting point determination, melting rate test, and chemical composition analysis.

[0039] During the entire implementation process, the sampling operation does not cause obvious disturbance to the liquid surface of the crystallizer, and the continuous casting production continues stably. Compared with the traditional slag sampling method, the sampling efficiency is improved by 40% by using the device and method of the present application, and the sample is more representative, which provides accurate and reliable data support for continuous casting process optimization, while ensuring the safety of the sampling personnel, and verifies the practicality and effectiveness of the crystallizer protective slag suction device and method.

Claims

1. A precision safe mould powder sucking device characterized in that, The utility model relates to a kind of sampling device for ladle slag, including L type transparent suction tube, rubber suction ball, transverse limiter, handheld rod, height limiter, the rubber suction ball is connected in one end of L type transparent suction tube, scale is equipped on the pipe wall of the other end of L type transparent suction tube, the height limiter is installed on the pipe wall of the one end of L type transparent suction tube with scale, the handheld rod is installed and fixed in the inside of rubber suction ball with rubber suction ball same side, the transverse limiter is installed in the inside of handheld rod, and the transverse limiter is slidably connected with L type transparent suction tube, the height limiter can also be opposite displacement with L type transparent suction tube.

2. A precision safe mould powder extraction device according to claim 1, wherein, The transverse limiter includes a sliding sleeve, a weight and a pull rod, the weight is connected to the lower part of the sliding sleeve by a soft rope, the sliding sleeve is sleeved on the L type transparent suction tube, and the pull rod is fixedly connected with the sliding sleeve.

3. A precision safe mould powder extraction device according to claim 1, wherein, The height limiter includes a sliding tube, a positioning clamp, a connecting rod and a float ball, the connecting rod is in right angle shape, the float ball is connected with one end of the connecting rod, the other end of the connecting rod is fixedly connected with the sliding tube perpendicularly, the sliding tube is slidably sleeved with the L type transparent suction tube, and the positioning clamp is fixed on the L type transparent suction tube at the lower part of the sliding tube.

4. A precision safe mould powder extraction device according to claim 3, wherein, The float ball is made of MgO-C, Al2O3-C or ZrO2-C based refractory material, or Al2O3-SiC-C or MgO-CaO-ZrO composite refractory material.

5. A precision safe mould powder extraction device according to claim 3, wherein, The height position of the positioning clamp is that when the sliding tube is clamped on the positioning clamp, the height of the float ball is consistent with the end of the L type transparent suction tube.

6. A precision safe mould powder extraction device according to claim 1, wherein, The sampling end of the L type transparent suction tube is a beveled tip.

7. A method of using a precision safe mould flux stripper according to any one of claims 1 to 6, characterised in that, The utility model further provides a sampling method, which comprises the following steps: 1) vertically fixing a baffle support at a safe position away from the crystallizer as a sampling position safety scale; 2) pulling the transverse limiter to a set position by the handheld rod, and the distance between the set position and the right angle of the L type transparent suction tube is equal to the sum of the distance from the slag sampling position of the crystallizer to the edge of the crystallizer and the distance from the baffle support to the edge of the crystallizer, so that the weight on the transverse limiter hangs down along one side of the baffle support; 3) first, squeezing the air in the rubber suction ball, then vertically inserting the L type transparent suction tube into the crystallizer from above, as the L type transparent suction tube is inserted into the protective slag layer, the float ball of the height limiter floats upward due to the buoyancy of the molten steel, when the sliding tube of the height limiter slides to the set height, the insertion is stopped, the protective slag is sucked into the L type transparent suction tube by the negative pressure generated by the rubber suction ball, and the amount of the protective slag is determined by the scale on the L type transparent suction tube; 4) the positioning clamp of the height limiter is used for limiting the sliding tube to prevent the sliding tube from falling off the L type transparent suction tube.

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