Blast furnace top plunger protection structure

Abstract

The utility model belongs to blast furnace ironmaking technical field relates to a kind of blast furnace top plunger protection structure, including protective grate, the protective grate includes frame and the grid net being set in frame, grid net is formed by transverse and longitudinal staggered grate bar welding, further including wear-resistant protection block, wear-resistant protection block is provided with the structure of insertion slot in lower end face, and the grate bar is inserted in insertion slot. The blast furnace top plunger protection structure of the utility model, by the installation of wear-resistant protection block, the wear resistance of protective grate has been significantly improved. Compared with before optimization, under the same production condition, the wear rate of wear-resistant protection block is significantly reduced, effectively protects the protective grate, prolongs its service life.

Description

Technical Field

[0001] This utility model belongs to the field of blast furnace ironmaking technology, and relates to a protective structure, particularly a blast furnace top plunger protective structure. Background Technology

[0002] As the core equipment in steel production, the stable operation of the blast furnace is crucial to the entire production process. The protective grate of the blast furnace top plunger, a key component of the blast furnace top system, plays a vital role in intercepting large foreign objects and preventing blockages and equipment malfunctions. However, in actual production, the protective grate is in direct contact with the furnace charge, resulting in severe surface wear. This leads to a reduction in grate thickness and an increase in gaps, making it unable to effectively block large foreign objects. If large foreign objects enter the blast furnace, they may become stuck in the throat, furnace body, or other parts, causing uneven distribution of the charge and affecting gas utilization efficiency. In severe cases, it can even cause blockages in the furnace top equipment, or damage critical equipment such as the furnace top distributor, ultimately forcing the blast furnace to shut down for maintenance, resulting in significant production losses and severely impacting its service life and stable operation.

[0003] Defects and shortcomings of existing technology: 1. The thickness of the grate decreases after wear: Under long-term wear, the thickness of the metal protective grate gradually decreases, and the original structural strength gradually declines.

[0004] 2. Increased grate gaps after wear: The gaps between the grate grids continue to widen under wear, and large foreign objects that were originally able to effectively block them may now pass through smoothly, thus losing the grate's intended interception function.

[0005] 3. Existing maintenance methods are insufficient: The replacement and repair of protective grates can only be carried out during blast furnace overhauls, which usually last for 3 months. Summary of the Invention

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a blast furnace top plunger protection structure with a scientific and reasonable structural design, long service life, good interception effect of foreign objects, convenient maintenance and easy implementation.

[0007] The technical problem solved by this utility model is achieved through the following technical solution: A protective structure for a blast furnace top plunger includes a protective grate, which comprises a frame and a grid mesh disposed within the frame. The grid mesh is welded from interlaced grate bars. The structure is characterized by further including wear-resistant protective blocks, which are fitted onto each of the grate bars. The wear-resistant protective blocks have a structure with an insertion groove on their lower end face, and the grate bars are inserted into the insertion groove.

[0008] Moreover, the wear-resistant protective block is made of ceramicized polyurethane composite material.

[0009] Furthermore, it also includes clamping spring sheets. Mounting notches are provided at the bottom of both sides of the wear-resistant protective block. Clamping spring sheets that are installed by pins are evenly distributed at the bottom of the mounting notches along their length direction. The clamping spring sheets consist of a mounting part and a clamping part that is bent upward on the mounting part.

[0010] Furthermore, it also includes a limiting rubber sleeve, which is fitted onto the clamping portion of the clamping spring sheet.

[0011] The advantages and beneficial effects of this utility model are as follows: The protective structure for the plunger at the top of this blast furnace significantly improves the wear resistance of the protective grate by installing wear-resistant protective blocks. Compared to before optimization, under the same production conditions, the wear rate of the wear-resistant protective blocks is significantly reduced, effectively protecting the protective grate. Actual production verification has shown that the service life of the protective grates with the added wear-resistant protective blocks is extended, far exceeding the original 3-month maintenance cycle. This means that the grates can continue to effectively intercept waste without worrying about performance degradation due to wear. The wear-resistant protective blocks adopt a modular design, making installation and replacement convenient. When individual wear-resistant protective blocks show severe wear, they can be replaced locally during a short blast furnace shutdown or production interval, without having to disassemble and repair the entire grate, greatly reducing maintenance difficulty and workload. Because the protective grate can effectively block large foreign objects for a long time, the incidence of blast furnace top blockage and equipment failure has been significantly reduced. Gas utilization efficiency has been improved, various operating parameters of the blast furnace have become more stable, and the operating rate has also been increased, providing a strong guarantee for efficient and stable production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the assembly of the wear-resistant protective block and the clamping spring sheet of this utility model.

[0013] Figure Labels 1-Frame, 2-Grate bar, 3-Wear-resistant protective block, 4-Insertion slot, 5-Limiting rubber sleeve, 6-Clamping spring sheet, 7-Installation notch. Detailed Implementation

[0014] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0015] This utility model improves the structure of the original protective grate, mainly including: 1. Grid Layout Optimization: Based on the characteristics of the furnace charge (such as particle size distribution and falling speed), optimize the shape, size, and layout of the grate grid. This ensures that the grid can effectively block large foreign objects while allowing the furnace charge to pass through smoothly, reducing unnecessary friction between the furnace charge and the grate.

[0016] 2. Strengthening the support structure: Reinforce the support structure at the key stress points of the grate to improve the overall structural strength and impact resistance of the grate, and reduce the aggravation of wear caused by structural deformation.

[0017] Specifically, this utility model provides a protective structure for a blast furnace top plunger, including a protective grate. The protective grate includes a frame 1 and a grid mesh set within the frame. The grid mesh is welded from crisscrossing grate bars 2. The welding spacing of the grate bars is adapted to the characteristics of the falling furnace charge. Its innovation lies in the inclusion of wear-resistant protective blocks 3. Wear-resistant protective blocks are fitted onto each of the grate bars. Each wear-resistant protective block has an insertion groove 4 on its lower end face, into which the grate bars are inserted. The wear-resistant protective blocks are modularly designed for easy installation and disassembly.

[0018] The wear-resistant protective block is made of ceramicized polyurethane composite material.

[0019] Polyurethane has good elasticity and wear resistance, which can buffer the impact of furnace charge to a certain extent and reduce friction damage to the grate surface. At the same time, polyurethane has good toughness and is not prone to brittle fracture, so it can adapt to changes in furnace top temperature and operating conditions.

[0020] Ceramics possess extremely high hardness and wear resistance, making them among the most wear-resistant materials known to date. Combining ceramics with polyurethane allows for the full utilization of the high wear resistance of ceramics and the elastic cushioning advantages of polyurethane, forming a wear-resistant composite material with complementary strengths.

[0021] To avoid insecure installation after assembly due to uneven grate bar thickness or uneven insertion groove walls, this invention incorporates clamping spring plates 6. Mounting notches 7 are provided at the bottom of both side walls of the wear-resistant protective block. Clamping spring plates, mounted via pins, are evenly distributed along the length of each notch at the bottom of the notch. Each clamping spring plate comprises a mounting portion and a clamping portion that is bent upwards on the mounting portion. After assembly, the wear-resistant protective block can be stably clamped onto the grate bars using these clamping spring plates.

[0022] To further limit the position of the wear-resistant protective block after installation, this utility model also designs a limiting rubber sleeve 5, which is fitted on the clamping part of the clamping spring sheet. The limiting rubber sleeve is used to further limit the position by increasing the friction force, thus ensuring the reliability of the installation.

[0023] During installation, the surface of the metal protective grate is first pre-treated (such as rust removal and polishing) to ensure a firm bond between the wear-resistant protective blocks and the grate surface. Then, according to the designed layout, the new wear-resistant protective blocks are installed one by one on the grate grid and surface to form a complete wear-resistant protective layer.

[0024] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A protective structure for a blast furnace top plunger, comprising a protective grate, the protective grate including a frame and a grid mesh disposed within the frame, the grid mesh being welded from interlaced grate bars, characterized in that: It also includes wear-resistant protective blocks, which are fitted onto each of the aforementioned grate bars. The wear-resistant protective blocks have a structure with an insertion groove on the lower end face, and the grate bars are inserted into the insertion groove.

2. The blast furnace top plunger protection structure according to claim 1, characterized in that: The wear-resistant protective block is made of ceramicized polyurethane composite material.

3. The blast furnace top plunger protection structure according to claim 1, characterized in that: It also includes clamping spring sheets. There are installation notches at the bottom of both sides of the wear-resistant protective block. Clamping spring sheets that are installed by pins are evenly distributed at the bottom of the installation notches along their length. The clamping spring sheets consist of an installation part and a clamping part that is bent upward on the installation part.

4. The blast furnace top plunger protection structure according to claim 3, characterized in that: It also includes a limiting rubber sleeve, which is fitted onto the clamping part of the clamping spring sheet.

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