Modular blast furnace tapping main channel facilitating quick maintenance

Abstract

The utility model provides a modularization blast furnace iron tapping main ditch convenient to maintain fast, including fixed in the foundation steel structure of iron tapping field platform, the ditch body of being assembled by independent impact unit and standard ditch section and sitting on it. Independent impact unit is fixed with foundation steel structure through a set of three -dimensional positioning component of integrated V type positioning seat and conical positioning pin, eccentric pressure arm axial locking assembly and quick -wearing connection structure of disc spring thermal expansion buffer mechanism, main ditch flow passage is continuous slope and realizes non iron storage formula work, and is equipped with movable mechanical slag scraper. The utility model discloses through modularization design and quick -wearing connection mechanism, realized the quick replacement of impact unit and full -line mechanization cleaning, has replaced the traditional heavy manual'gouging ditch'operation completely, has the remarkable advantages such as high maintenance efficiency, long service life, operation safety and low comprehensive cost.

Description

Technical Field

[0001] This utility model relates to the technical field of blast furnace ironmaking equipment, and in particular to a modular blast furnace tapping main channel that is easy to maintain quickly. Background Technology

[0002] The main tapping channel of a blast furnace is a crucial passage for receiving high-temperature molten iron and guiding its flow to the skimmer. Traditionally, the main channel is a monolithically rammed, iron-storing structure, meaning that molten iron is retained within the channel for extended periods to maintain its temperature. This structure leads to uneven wear of the refractory lining within the main channel, with damage occurring more rapidly, particularly in the molten iron impact zone.

[0003] Its main maintenance method is "grooving": that is, regularly removing solidified residual iron and damaged refractory material from the groove. A complete "grooving" operation usually takes tens of hours, which seriously restricts the rapid resumption of blast furnace production and affects production efficiency.

[0004] Therefore, there is an urgent need for a new type of main trench structure that can fundamentally avoid the "ditching" operation. Summary of the Invention

[0005] To address the aforementioned problems, this utility model provides a modular blast furnace tapping main channel that is easy to maintain quickly.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a modular blast furnace tapping main channel that is easy to maintain quickly, comprising a foundation steel structure fixedly installed on the tapping platform, and a channel body located on the foundation steel structure and assembled from several prefabricated standard channel sections; the channel body includes an independent impact unit located directly below the molten iron drop point and the standard channel sections connected thereto; the independent impact unit is detachably fixed through a quick-connect structure set on the foundation steel structure; the bottom of the main channel is a continuous slope, forming a non-iron storage structure; and a movable mechanical slag scraper that matches the cross-section of the main channel is also provided.

[0007] Furthermore, the quick connection structure includes: The three-dimensional positioning and bearing component includes two or more V-shaped positioning seats fixed to the basic steel structure, and conical positioning pins fixed to the outer steel shell of the independent impact unit and fitted into the V-shaped positioning seats one by one. An axial floating locking assembly is located at one end of the independent impact unit away from the flow direction of molten iron. It includes a locking support fixed to the foundation steel structure, an eccentric pressure arm hinged to the locking support, and a pressure block fixed to the independent impact unit for the eccentric pressure arm to press. A thermal expansion buffer mechanism is installed between the bottom of the independent impact unit and the basic steel structure, and is either a disc spring assembly or a high-temperature resistant elastic refractory material pad.

[0008] Furthermore, an expansion buffer gap is maintained between the independent impact unit and the adjacent standard groove segment.

[0009] Furthermore, the independent impact unit is prefabricated from silicon nitride combined with silicon carbide, chromium corundum, or zirconium corundum refractory materials.

[0010] Furthermore, the standard trench section is externally encased in steel armor and is equipped with lifting trunnions.

[0011] Furthermore, a refractory fiber buffer layer is provided at the connection between the independent impact unit and the standard groove section.

[0012] Furthermore, the continuous slope at the bottom of the flow channel has a gradient of ≥3%.

[0013] Furthermore, the movable mechanical scraper includes: A rigid main frame; a scraper assembly fixed to the front end of the main frame, the blade profile of the scraper assembly being conformally matched to the cross-section of the main channel; a traction lug disposed on the top of the main frame; and guide wheel assemblies disposed on the sides and bottom of the main frame.

[0014] Furthermore, the scraper material of the scraper assembly is high-chromium cast iron or has a wear-resistant alloy layer welded to its surface.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: This utility model adopts a combination of "slope gravity drainage + mechanized slag scraping" to ensure that there is no solidified residual iron in the ditch. When the main ditch is partially damaged, no crushing or cleaning operations are required, thus achieving a clean and mechanized maintenance process. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the overall structure of a modular blast furnace tapping main trough that is easy to maintain according to this utility model. Figure 2 This is a top view schematic diagram of a modular blast furnace tapping main channel that is easy to maintain according to this utility model; Figure 3 This is a partially enlarged schematic diagram of a quick-connect structure for a modular blast furnace tapping main channel that is easy to maintain according to this utility model. Labeling Explanation: 1-Independent Impact Unit; 2-Standard Groove Section; 3-Basic Steel Structure; 4-Quick Connection Structure; 411-V-Type Positioning Seat; 421-Conical Positioning Pin; 431-Locking Support; 432-Eccentric Pressure Arm; 433-Pressure Block; 5-Refractory Fiber Buffer Layer; 6-Steel Structure Armor; 7-Lifting Trunnion. Detailed Implementation

[0017] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0018] Please refer to the reference. Figure 1 , Figure 2 and Figure 3 This utility model discloses a modular blast furnace tapping main channel that is easy to maintain. It includes a foundation steel structure 3 fixedly installed on the tapping platform foundation, and a channel body situated on the foundation steel structure and assembled from several prefabricated standard channel sections 2. The channel body includes an independent impact unit 1 positioned directly below the molten iron drop point and the standard channel sections 2 connected thereto. The independent impact unit 1 is detachably fixed via a quick-connect structure 4 mounted on the foundation steel structure 3. The bottom of the main channel is a continuous slope, forming a non-iron storage structure. A movable mechanical slag scraper, matching the cross-section of the main channel, is also provided.

[0019] The "non-storage" inclined flow channel design allows molten iron to drain completely by gravity after tapping, fundamentally preventing the formation of "cold caps" and hard residual iron from solidifying. Furthermore, a movable mechanical scraper quickly removes the thin layer of slag adhering to the channel walls, achieving mechanized cleaning across the entire line. When the most vulnerable independent impact unit needs replacement, a quick-connect structure connecting its bottom to the foundation steel structure allows for precise positioning, secure locking, and rapid release. This series of collaborative principles brings revolutionary benefits: completely replacing the traditional, heavy, dirty, and time-consuming "channel cleaning" work, reducing maintenance time to a few hours and significantly improving blast furnace operating rates. Simultaneously, the modular design and precise replacement strategy not only significantly reduce worker workload and safety hazards but also enable on-demand replacement and lifespan management, effectively saving on refractory material costs and maintenance costs per ton of iron.

[0020] Furthermore, the quick connection structure includes: The three-dimensional positioning and bearing component includes two or more V-shaped positioning seats fixed to the basic steel structure, and conical positioning pins fixed to the outer steel shell of the independent impact unit and fitted into the V-shaped positioning seats one by one. An axial floating locking assembly is located at one end of the independent impact unit away from the flow direction of molten iron. It includes a locking support fixed to the foundation steel structure, an eccentric pressure arm hinged to the locking support, and a pressure block fixed to the independent impact unit for the eccentric pressure arm to press. A thermal expansion buffer mechanism is installed between the bottom of the independent impact unit and the basic steel structure, and is either a disc spring assembly or a high-temperature resistant elastic refractory material pad.

[0021] The quick-connect structure achieves precise, stable, and rapid assembly and disassembly of the independent impact unit through the synergistic action of its three major components: its three-dimensional positioning and bearing component utilizes the interlocking of a "V-shaped positioning seat" and a "conical positioning pin" to automatically guide and precisely define the three-dimensional spatial position of the impact unit at the moment of installation, while bearing its own weight and the impact load of molten iron; the axial floating locking component applies a huge self-locking force to the "pressure block" by rotating the "eccentric pressure arm" using the cam principle, thereby firmly locking the impact unit in the axial direction and effectively resisting the reverse impact caused by the scouring of molten iron; and the thermal expansion buffer mechanism provides buffer space for the vertical expansion of the impact unit after heating through the "disc spring group" or elastic pad at the bottom, releasing thermal stress. This structure brings revolutionary benefits: it simplifies the traditionally cumbersome replacement process into three quick steps: "hoisting-positioning-locking," enabling replacement to be completed within hours, resulting in an order-of-magnitude improvement in maintenance efficiency; the rigid-flexible design ensures the rigidity and reliability of the equipment under high temperature and heavy load, while effectively managing thermal stress to significantly extend the service life of the modules and foundation structure; the entire process requires only simple tools, is safe and convenient to operate, and completely eliminates safety risks and uncertainties in the maintenance process.

[0022] Furthermore, an expansion buffer gap is maintained between the independent impact unit and the adjacent standard groove segment.

[0023] Furthermore, the independent impact unit is prefabricated from silicon nitride combined with silicon carbide, chromium corundum, or zirconium corundum refractory materials. This gives the independent impact unit extremely high high-temperature strength, excellent wear resistance, and superior resistance to slag and iron erosion.

[0024] Furthermore, the standard trench section is externally encased in a steel structure armor and equipped with lifting trunnions. The steel structure armor provides a convenient welding or bolted connection base for the installation of other auxiliary components. By giving the refractory prefabricated component a robust metal shell, it solves the problems of structural strength, integrity, and ease of operation throughout its entire life cycle of manufacturing, transportation, installation, and use.

[0025] Furthermore, a refractory fiber buffer layer is provided at the connection between the independent impact unit and the standard groove section.

[0026] Furthermore, the continuous slope at the bottom of the flow channel has a gradient of ≥3%.

[0027] Furthermore, the movable mechanical scraper includes: A rigid main frame; a scraper assembly fixed to the front end of the main frame, the blade profile of the scraper assembly being conformally matched to the cross-section of the main channel; a traction lug disposed on the top of the main frame; and guide wheel assemblies disposed on the sides and bottom of the main frame.

[0028] Furthermore, the scraper material of the scraper assembly is high-chromium cast iron or has a wear-resistant alloy layer welded to its surface.

[0029] As described above, the core of this utility model, a modular blast furnace tapping main trough for easy and rapid maintenance, lies in constructing a tapping main trough system that integrates modularity, non-iron storage, and rapid maintenance. First, a basic steel structure is installed on the tapping platform as a load-bearing frame. Then, prefabricated standard trough sections with steel structure armor and lifting trunnions are assembled onto it, forming a flow channel with a continuous slope of ≥3%, ensuring that molten iron is completely discharged by gravity. The core innovation lies in the use of prefabricated independent impact units made of high-end refractory materials such as silicon nitride combined with silicon carbide or chromium corundum. These units are precisely and firmly fixed below the taphole through a rapid connection structure integrating three-dimensional positioning (V-shaped seat and conical pin), axial floating locking (eccentric pressure arm), and thermal expansion buffering (disc spring). To completely replace the "groove cleaning" operation, the system is equipped with a movable mechanical slag scraper to quickly remove residual slag and iron from the trough after tapping. This series of interconnected designs collectively achieves a revolutionary transformation in main trough maintenance from tens of hours of manual labor to several hours of mechanized operation.

[0030] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A modular blast furnace tapping main channel that is easy to maintain quickly, characterized in that: It includes a foundation steel structure (3) fixedly installed on the iron tapping platform, and a ditch body located on the foundation steel structure and assembled from several prefabricated standard ditch sections (2); the ditch body includes an independent impact unit (1) located directly below the molten iron drop point and the standard ditch section (2) connected thereto; the independent impact unit (1) is detachably fixed by a quick-connect structure (4) set on the foundation steel structure (3); the bottom of the main ditch channel is a continuous slope, forming a non-iron storage structure; and a movable mechanical slag scraper that matches the cross-section of the main ditch channel is also provided.

2. The modular blast furnace tapping main channel as described in claim 1, characterized in that: The quick connection structure (4) includes: The three-dimensional positioning and bearing component includes two or more V-shaped positioning seats (411) fixed on the basic steel structure (3), and conical positioning pins (421) fixed on the outer steel shell of the independent impact unit (1) and fitted one-to-one with the V-shaped positioning seats (411). An axial floating locking assembly is provided at one end of the independent impact unit (1) away from the direction of molten iron flow. It includes a locking support (431) fixed on the foundation steel structure (3), an eccentric pressure arm (432) hinged to the locking support (431), and a pressure block (433) fixed on the independent impact unit (1) for the eccentric pressure arm (432) to press. The thermal expansion buffer mechanism is located between the bottom of the independent impact unit (1) and the basic steel structure (3), and is a disc spring assembly (43) or a high-temperature resistant elastic refractory material pad.

3. The modular blast furnace tapping main channel as described in claim 1, characterized in that: An expansion buffer gap is maintained between the independent impact unit (1) and the adjacent standard groove segment (2).

4. The modular blast furnace tapping main channel as described in claim 1, characterized in that: The independent impact unit (1) is prefabricated from silicon nitride combined with silicon carbide, chromium corundum or zirconium corundum refractory material.

5. The modular blast furnace tapping main channel as described in claim 1, characterized in that: The standard trench section (2) is covered with a steel structure armor (6) and is equipped with a lifting trunnion (7).

6. The modular blast furnace tapping main channel as described in claim 1, characterized in that: A refractory fiber buffer layer (5) is provided at the connection between the independent impact unit (1) and the standard groove section (2).

7. The modular blast furnace tapping main channel as described in claim 1, characterized in that: The continuous slope at the bottom of the flow channel has a gradient of ≥3%.

8. The modular blast furnace tapping main channel as described in claim 1, characterized in that: The movable mechanical slag scraper includes: A rigid main frame; a scraper assembly fixed to the front end of the main frame, the blade profile of the scraper assembly being conformally matched to the cross-section of the main channel; a traction lug disposed on the top of the main frame; and guide wheel assemblies disposed on the sides and bottom of the main frame.

9. The modular blast furnace tapping main channel as described in claim 8, characterized in that: The scraper assembly is made of high-chromium cast iron or has a wear-resistant alloy layer welded to its surface.

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