Operation method for cleaning caulking seam of crystallizer

Abstract

The invention provides an operation method for cleaning a caulking seam of a crystallizer, and belongs to the field of steelmaking and continuous casting. Aiming at the problems of falling of accumulated slag, incomplete cleaning of hardened slag and the like in the traditional water pipe flushing and cleaning of the caulking, the invention provides an optimized scheme: the accumulated slag of a cover plate is thoroughly cleaned before a crystallizer is opened, and the slag is prevented from falling into the caulking; a special tool is used, stainless steel pipes are connected with rectangular thin steel plates, high-pressure water flow flushing and scraping are synchronously carried out, and hardened slag is removed; the caulking opening is gradually expanded in stages, and thorough cleaning is ensured; and the crystallizer is clamped after cleaning, a filler gauge is used for checking the caulking gap, and the locking plug pin is installed again after technological conditions are met. The method can improve the casting blank quality, guarantee production safety and improve the operation rate of a casting machine, tools can be repeatedly used, and operation is easy, convenient and efficient.

Description

Technical Field

[0001] The present invention belongs to the field of steelmaking continuous casting and relates to an operation method for cleaning the gap of a mold. Background Art

[0002] In the field of steelmaking continuous casting, the mold of a continuous caster is one of the key equipment in the continuous casting process, and its function is to cool the continuously poured molten steel and initially solidify it into a shell. In this process, the cleaning of the gap of the mold is particularly important, because if the slag and ash accumulated in the gap are not thoroughly cleaned, it will have a serious impact on the quality of the cast slab and production safety.

[0003] Traditionally, the cleaning of the gap of the mold of a continuous caster mainly relies on water pipe flushing. However, this method has many deficiencies in actual operation. First, during the process of opening the mold, the slag accumulated on the mold cover plate is likely to fall into the gap, resulting in an increase in the slag accumulated in the gap and increasing the cleaning difficulty. Second, due to the need to open the mold multiple times to meet the production requirements of different cross-sections, the slag and ash accumulated at the gap are prone to caking and forming hard slag blocks, which cannot be effectively removed only by water pipe flushing. In addition, the flushing force and direction of the water pipe are limited, and often can only flush away the loose slag, and are powerless against the slag accumulated and caked in the gap.

[0004] The existence of these problems not only affects the cleaning effect of the gap of the mold, but also affects the quality of the cast slab and production safety. Specifically, if the gap of the mold is not thoroughly cleaned, the slag and ash accumulated in the gap will cause an increase in the gap of the mold. During the non-steady casting processes such as starting up and changing ladles, the phenomenon of steel clamping in the gap of the mold is likely to occur, and in severe cases, it may even lead to malignant production accidents, forcing the production to be interrupted. This will not only cause economic losses, but also pose a serious threat to production safety.

[0005] Therefore, in view of the problems and deficiencies existing in the prior art, it is particularly important to develop a more effective operation method for cleaning the gap of the mold. This method needs to be able to thoroughly remove the slag on the mold cover plate to prevent it from falling into the gap; at the same time, it also needs to be able to effectively clean the caked slag in the gap to ensure that the cleanliness and gap of the gap meet the process production conditions. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an operation method for cleaning the gap of the mold. By optimizing the cleaning method and improving the cleaning effect, it can ensure the quality of the cast slab, reduce the risk of production accidents, improve the operation rate of the caster, and provide more stable and reliable technical support for steelmaking continuous casting production.

[0007] To achieve the above purpose, the present invention provides the following technical solution: An operation method for cleaning the gap of the mold, comprising the following steps:

[0008] (1) Before opening the crystallizer, thoroughly remove the slag accumulation on the crystallizer cover plate;

[0009] (2) Remove the crystallizer locking pin and open the crystallizer seam;

[0010] (3) Flush the seam with high-pressure water flow, and at the same time use a special tool with a rectangular thin steel plate structure at the front end to scrape the caked slag in the seam;

[0011] (4) Repeat the flushing and scraping operations in step (3) until the cleaning is completed;

[0012] (5) After clamping the crystallizer, use a feeler gauge to check the seam gap and confirm that it meets the process conditions;

[0013] (6) Install the crystallizer locking pin in place.

[0014] Optionally, the special tool described in step (3) is composed of the following structure: a circular stainless steel steel pipe with a lifting ring provided at its rear end; a rectangular stainless steel thin steel plate connected to the front end of the steel pipe, and a cutting edge is formed within a range of 100 mm at the end of the thin steel plate.

[0015] Optionally, the thickness of the thin steel plate gradually changes from 0.8 mm at the connection with the steel pipe to 0.2 mm at the end.

[0016] Optionally, the total length of the stainless steel steel pipe is 1500 mm and the diameter is 8 mm, and the planar size of the thin steel plate is 300 mm × 100 mm.

[0017] Optionally, the standard for feeler gauge inspection in step (5) is that the seam gap ≤ 0.2 mm.

[0018] Optionally, the operation of opening the crystallizer seam described in step (2) includes gradually expanding the seam opening in stages, and the opening amplitude each time does not exceed 5 mm.

[0019] Optionally, the diameter of the lifting ring is 57 mm, and it is connected to the stainless steel steel pipe by welding.

[0020] Optionally, the direction of the flushing water flow in step (3) forms an angle of 45° - 60° with the moving direction of the scraping tool.

[0021] Optionally, the operation sequence of steps (1) - (6) cannot be changed, and the flushing and scraping in step (3) must be carried out synchronously.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) Improve the quality of the continuous casting billet: By thoroughly cleaning the gaps of the mold, the quality problems of the continuous casting billet caused by slag and ash accumulation in the gaps are avoided. If the gaps are not cleaned thoroughly, the gap width will increase, which is likely to cause the phenomenon of steel clamping in the mold gaps during the unstable casting process such as startup and ladle change, affecting the quality of the continuous casting billet. After adopting this cleaning method, the phenomenon of steel clamping in the mold gaps has not occurred again, significantly improving the quality of the continuous casting billet.

[0024] 2) Ensure production safety: If the slag accumulation in the gaps is not cleaned thoroughly, it will seriously lead to malignant production accidents and force the production to be interrupted. By optimizing the cleaning method, the risk of production accidents caused by improper gap cleaning is reduced, ensuring the continuity and safety of production.

[0025] 3) Improve the operation rate of the continuous casting machine: After cleaning the gaps of the mold, it provides external conditions for the online hot width adjustment of the continuous casting machine, ensuring the smooth progress of the online hot width adjustment of the continuous casting machine, thereby improving the operation rate of the continuous casting machine.

[0026] 4) Ensure the hot delivery rate of the continuous casting billet: Due to the improvement of the quality of the continuous casting billet and the reduction of production accidents, the hot delivery rate of the continuous casting billet is effectively ensured, reducing production delays and losses caused by the quality problems of the continuous casting billet.

[0027] 5) The tool can be reused: The special tool used in this method is simple to manufacture and can be reused, reducing the cleaning cost and improving the economic benefits.

[0028] 6) Simple and efficient operation: Through optimization measures such as gradually expanding the gap opening in stages and synchronously performing flushing and scraping operations, the cleaning process is made more simple and efficient, reducing the cleaning time and labor cost.

[0029] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. Brief Description of the Drawings

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0031] Figure 1 It is a schematic diagram of the special tool of the present invention.

[0032] Reference numerals: circular stainless steel pipe 1, thin steel plate 2, lifting ring 3. Detailed Embodiments

[0033] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0034] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Please refer to Figure 1 , which is a specific implementation manner of an operation method for cleaning the gap of the mold.

[0037] Example 1,

[0038] Step 1: Preparation stage

[0039] Tool preparation: According to the technical solution of the present invention, prepare a special cleaning tool, which is composed of a circular stainless steel pipe 1 (diameter 8 mm, total length 1500 mm) connected to a rectangular stainless steel thin plate 2 (plane size 300 mm × 100 mm, the thickness gradually changes from 0.8 mm at the connection with the steel pipe to 0.2 mm at the end, and a cutting edge is formed within the range of 100 mm at the end), and a welded lifting ring 3 with a diameter of 57 mm is provided at the rear end.

[0040] Safety inspection: Ensure that all operators have worn personal protective equipment, such as safety helmets, protective glasses, protective gloves, etc. Check the mold and its surrounding environment to ensure there are no safety hazards.

[0041] Step Two: Clean the slag accumulation on the crystallizer cover plate

[0042] Use a vacuum cleaner or compressed air: Before opening the crystallizer, use a vacuum cleaner or compressed air to thoroughly remove the slag accumulation on the crystallizer cover plate to prevent slag from entering the joint after opening the crystallizer joint.

[0043] Step Three: Open the crystallizer joint

[0044] Remove the locking pin: Carefully remove the locking pin of the crystallizer to ensure smooth operation and avoid damaging the pin or the crystallizer.

[0045] Open in stages: According to the method of the present invention, gradually expand the joint opening in stages, with the opening amplitude not exceeding 5 mm each time until the required cleaning width is reached.

[0046] Step Four: Flush and scrape

[0047] Flush with high-pressure water flow: Use a high-pressure water flow to initially flush the joint to loosen the slag accumulation inside the joint.

[0048] Scrape synchronously: At the same time, use a special tool to scrape the caked slag inside the joint, ensuring that the angle between the direction of the flushing water flow and the moving direction of the scraping tool is 45° - 60° to improve the cleaning effect.

[0049] Repeat the operation: Repeat the flushing and scraping operations until there is no obvious slag residue left inside the joint.

[0050] Step Five: Check and reinstall

[0051] Check the joint gap: After cleaning, clamp the crystallizer and use a feeler gauge to check the joint gap to ensure that the gap ≤ 0.2 mm, meeting the process production conditions.

[0052] Reinstall the locking pin: After confirming that the joint gap meets the requirements, reinstall the locking pin of the crystallizer in place to ensure that the pin is firmly installed.

[0053] Example Two

[0054] Step One: The same as Example One

[0055] The preparation stage is the same as that of Example One, including tool preparation and safety inspection.

[0056] Step Two: Special cleaning measures

[0057] Pretreatment: Before cleaning the slag accumulation on the crystallizer cover plate, perform pretreatment on the crystallizer cover plate, such as wiping it with a wet cloth to soften stubborn slag accumulation for subsequent cleaning.

[0058] Step Three: Open the crystallizer joint (the same as Example One)

[0059] Remove the locking pin and gradually expand the gap opening in stages.

[0060] Step 4: Intensive flushing and scraping

[0061] Use a special flushing agent: When flushing with high-pressure water flow, a proper amount of special flushing agent can be added to enhance the dissolution ability of the accumulated slag.

[0062] Alternate the use of tools: During the scraping process, alternate the use of scraping tools with different shapes (such as pointed tips, flat heads, etc.) to meet the cleaning requirements of the accumulated slag at different positions in the gap.

[0063] Deep cleaning: For severely caked accumulated slag, the method of repeated flushing and scraping can be adopted to ensure thorough cleaning inside the gap.

[0064] Step 5: Fine inspection and reinstallation (the same as in Embodiment 1)

[0065] Use a feeler gauge to finely inspect the gap of the joint, and reinstall the locking pin after confirming that the process conditions are met.

[0066] From the above two embodiments, it can be seen that an operation method for cleaning the gap of a mold provided by the present invention has the advantages of simple operation and remarkable cleaning effect. Embodiment 1 shows the basic operation process, while Embodiment 2 adds special cleaning measures and steps of intensive flushing and scraping on this basis to meet the cleaning requirements in different situations. Both embodiments can effectively improve the quality of the cast slab, ensure production safety, increase the operation rate of the casting machine, and reduce the cleaning cost.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An operating method for cleaning the gap of a mold, characterized in that, It includes the following steps: (1) Before opening the crystallizer, thoroughly remove the accumulated slag on the crystallizer cover plate; (2) Remove the crystallizer locking pin and open the crystallizer seam; (3) Flush the seam with high-pressure water flow, and at the same time use a special tool with a rectangular thin steel plate structure at the front end to scrape the caked slag in the seam; (4) Repeat the flushing and scraping operations in step (3) until the cleaning is completed; (5) After clamping the crystallizer, use a feeler gauge to check the seam clearance and confirm that it meets the process conditions; (6) Reinstall the crystallizer locking pin in place.

2. The operating method for cleaning the gap of the mold according to claim 1, characterized in that: The special tool described in step (3) consists of the following structure: a circular stainless steel steel pipe with a lifting ring provided at its rear end; a rectangular stainless steel thin steel plate connected to the front end of the steel pipe, and a cutting edge is formed within a range of 100 mm at the end of the thin steel plate.

3. The operating method for cleaning the gap of the mold according to claim 2, characterized in that: The thickness of the thin steel plate gradually changes from 0.8 mm at the connection with the steel pipe to 0.2 mm at the end.

4. The operating method for cleaning the gap of the mold according to claim 2, characterized in that: The total length of the stainless steel steel pipe is 1500 mm and the diameter is 8 mm, and the planar size of the thin steel plate is 300 mm×100 mm.

5. The operating method for cleaning the gap of the mold according to claim 1, characterized in that: The standard for feeler gauge inspection in step (5) is that the seam clearance ≤ 0.2 mm.

6. The operating method for cleaning the gap of the mold according to claim 1, characterized in that: The operation of opening the crystallizer seam described in step (2) includes gradually expanding the seam opening in stages, and the opening amplitude each time does not exceed 5 mm.

7. The operating method for cleaning the gap of the mold according to claim 2, wherein: The diameter of the lifting ring is 57 mm, and it is connected to the stainless steel steel pipe by welding.

8. A method for cleaning the gap of a mold according to claim 1, characterized in that: In step (3), the direction of the flushing water flow forms an angle of 45°-60° with the moving direction of the scraping tool.

9. The operating method for cleaning the gap of the mold according to claim 1, characterized in that: The operation sequence of steps (1)-(6) cannot be changed, and the flushing and scraping in step (3) must be carried out synchronously.

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