Blast furnace tuyere plugging device capable of realizing stemming prefabrication

Abstract

The utility model discloses a blast furnace tuyere plugging device capable of realizing stemming prefabrication, which belongs to the technical field of blast furnace production and comprises prefabricated stemming and a stemming feeding push rod capable of being matched with the prefabricated stemming, the prefabricated stemming is formed by pressing through a forming mold and is of a cone frustum structure, and a positioning concave hole is formed in the prefabricated stemming located at the large-diameter end. A connecting disc is arranged at the connecting end of the mud feeding push rod, a positioning boss matched with the positioning concave hole is arranged on the connecting disc, the positioning boss on the mud feeding push rod is inserted into the positioning concave hole of the prefabricated stemming, and the prefabricated stemming is placed into the blast furnace tuyere. The prefabricated stemming is formed by pressing the forming die in advance, does not need to be prepared and molded on site, is directly pushed by the stemming feeding push rod, quickly completes tuyere plugging operation, improves tuyere plugging efficiency and tuyere plugging quality, and reduces material cost.

Description

Technical Field

[0001] This utility model belongs to the field of blast furnace production technology, and in particular relates to a blast furnace tuyeres plugging device that can realize the prefabrication of taphole clay. Background Technology

[0002] In blast furnace smelting production, fluctuations in furnace conditions or equipment maintenance often necessitate tuyere sealing to isolate specific tuyeres, stabilize furnace conditions, or perform localized emergency repairs. Rapid and reliable tuyere sealing is a crucial operation for handling furnace condition fluctuations and implementing emergency equipment repairs. Currently, the industry's commonly used traditional tuyere sealing method relies on manually filling bulk taphole clay on-site, which has the following systemic drawbacks:

[0003] 1. Poor timeliness of emergency repairs hinders the efficiency of production recovery.

[0004] Operators must complete processes such as taking clay, kneading by hand, filling and shaping it layer by layer in a high-temperature and high-risk environment in front of the furnace. This process is time-consuming, seriously delaying the golden window for blast furnace repairs, resulting in prolonged shutdown time and direct loss of production capacity.

[0005] 2. Insufficient sealing reliability poses a potential safety hazard during operation.

[0006] There are three major technical bottlenecks in manual on-site shaping: shape mismatch, as it is difficult to accurately reproduce the structure of the vent cone hole by hand, resulting in gaps between the clay and the inner wall; uneven density, with layered filling forming an internal layered structure that is prone to micro-cracks under pressure; and positioning deviation, as the clay is prone to deviating from its axial position without the assistance of a guiding mechanism.

[0007] The aforementioned defects will cause air leakage and gas flow, which will not only reduce the stability of the furnace, but also accelerate the burnout of the tuyeres sleeve and pose a risk of gas leakage.

[0008] 3. Bulk gunning clay is prone to material waste. When manually filling gunning clay on site, the lack of accurate measurement can easily lead to improper operation and waste of bulk gunning clay. It is also easily affected by the environment during storage and transportation, which can reduce its performance and lead to resource waste. Summary of the Invention

[0009] To address the problems existing in the prior art, this utility model provides a blast furnace tuyere plugging device that enables pre-made taphole clay. The pre-made taphole clay is pre-pressed by a molding die, eliminating the need for on-site mixing and shaping. It is directly pushed by a clay feeding pusher to quickly complete the tuyere plugging operation, thereby improving tuyere plugging efficiency, enhancing tuyere plugging quality, and reducing material costs.

[0010] This utility model is implemented as follows: a blast furnace tuyere blocking device that can realize the prefabrication of gun clay, including prefabricated gun clay and a clay feeding pusher that can cooperate with the prefabricated gun clay; the prefabricated gun clay is pressed by a molding mold, the prefabricated gun clay has a truncated cone structure, and a positioning recess is provided in the prefabricated gun clay at the large diameter end.

[0011] The connecting end of the mud feeding pusher is provided with a connecting disc, and the connecting disc is provided with a positioning boss that matches the positioning recess. The positioning boss on the mud feeding pusher is inserted into the positioning recess of the precast taphole mud, and the precast taphole mud is placed into the blast furnace tuyeres.

[0012] Furthermore, the forming mold includes a forming barrel with an opening at the top, and a pressure cap is provided inside the forming barrel on the side of the opening. The pressure cap and the forming barrel form a truncated cone-shaped cavity, and the taper of the truncated cone-shaped cavity matches the inner wall of the blast furnace tuyeres. A lifting handle is provided at the upper end of the pressure cap, and a steel protrusion for positioning the forming of the recess is provided at the lower end of the pressure cap.

[0013] The molding barrel and the pressure cap combine to form a closed truncated cone-shaped cavity. The precast clay is uniformly deformed under pressure during the molding process, ensuring that the shape of the precast clay accurately fits the inner wall of the air vent, thus improving the quality of air vent sealing. The pressure cap is equipped with a lifting handle, which facilitates the opening and closing of the mold and the demolding of the clay, reducing the intensity of manual operation and improving the convenience of production. The steel protrusion of the pressure cap can form a positioning recess on the precast clay, which, together with the positioning protrusion of the clay feeding push rod, ensures precise positioning, avoids displacement, and improves the success rate of air vent sealing.

[0014] Furthermore, the diameter of the pressure cap is smaller than the diameter of the opening of the molding barrel. During the pressing and molding process, the pressure can be better transferred to the clay, ensuring the molding quality and dimensional accuracy of the precast clay.

[0015] Furthermore, two positioning recesses are provided, symmetrically distributed centrally, with a distance between them equal to one-third of the diameter of the large-diameter end. These two symmetrical positioning recesses, in conjunction with the positioning boss of the mud-feeding pusher, ensure the stability of the precast mud during the pushing process, preventing deviation and rotation, and ensuring accurate delivery into the blast furnace tuyeres. The symmetrical distribution of the positioning recesses and the positioning boss effectively improves the positioning accuracy of the precast mud, ensuring a tight fit with the inner wall of the blast furnace tuyeres and preventing air leakage. The symmetrical distribution of the two positioning recesses makes the precast mud more evenly stressed, reducing local stress concentration, lowering the risk of damage during pushing or use, and extending its service life. The reasonable spacing between the two positioning recesses makes the precast mud more evenly stressed, avoiding excessive or insufficient local stress due to improper spacing, thereby enhancing the stability of the precast mud during pushing and use, and preventing deviation or rotation.

[0016] Furthermore, the depth of the positioning recess is 1 / 4 to 1 / 6 of the height of the precast clay. This ensures a tight fit between the positioning boss and the positioning recess, maintaining stability of the precast clay during the pushing process, while preventing the positioning boss from becoming difficult to embed or the precast clay from experiencing uneven stress due to excessive depth, thus ensuring smooth operation of the air vent blocking. Reasonably controlling the depth of the positioning recess avoids situations where the internal structure of the precast clay is weak and easily damaged during use due to excessively deep positioning recesses, ensuring the overall strength and stability of the precast clay. A moderate depth design facilitates smooth demolding of the precast clay from the molding mold, avoiding demolding difficulties or damage to the precast clay during demolding due to excessively deep positioning recesses, thereby improving production efficiency.

[0017] Furthermore, the large-end diameter of the precast taphole clay ranges from 150 to 200 mm, the cone angle is 15° to 25°, and the height is 200 to 300 mm. The large-end diameter of 150 to 200 mm is well-suited to the size requirements of most blast furnace tuyeres, ensuring smooth placement and tight adhesion to the inner wall, preventing air leakage. The 200 to 300 mm height meets the actual operational needs of blast furnace tuyere sealing, ensuring sufficient sealing without wasting material due to excessive height or affecting sealing effectiveness due to insufficient height. The 15° to 25° cone angle ensures tight adhesion between the precast clay and the tuyere inner wall, facilitates molding and demolding, and better adapts to the shape of the tuyere inner wall during the pushing process, reducing adjustment time.

[0018] The advantages and technical effects of this utility model are as follows: Due to the adoption of the above technical solution, the pre-made blasting clay is pre-pressed by the molding mold, eliminating the need for on-site mixing and shaping. It is directly pushed by the clay feeding pusher, which quickly completes the air vent blocking operation, improves the air vent blocking efficiency and quality, and reduces material costs.

[0019] Pre-formed plugging clay is pre-pressed into a truncated cone structure in a molding mold, eliminating the need for on-site material collection, mixing, and shaping. Pre-formed production reduces the preparation time for plugging materials by 70%, significantly shortening on-site operation time and improving emergency repair efficiency.

[0020] The precast taphole clay's truncated cone structure fits tightly against the inner wall of the blast furnace tuyeres. The positioning recesses and the positioning protrusions of the clay feeding pusher are precisely matched, solving the problem of axial offset in traditional manual pushing. This ensures accurate and stable positioning during the pushing process, effectively preventing air leakage and guaranteeing the safe operation of the blast furnace.

[0021] Prefabricated gun clay has a regular shape and precise size, which avoids overfilling, reduces the amount of material used per batch, and improves utilization. At the same time, it avoids the loss and performance degradation of bulk gun clay during storage and transportation, further saving costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the precast gun clay structure provided in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the mud-feeding pusher structure provided in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the molding die structure provided in an embodiment of the present utility model.

[0025] In the diagram: 1. Precast clay; 1-1. Positioning recess; 2. Clay feeding pusher; 2-1. Connecting disc; 2-2. Positioning boss; 3. Molding mold; 3-1. Molding barrel; 3-2. Pressure cap; 3-3. Lifting handle; 3-4. Steel protrusion. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0027] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figure 1 and Figure 2 As shown, this application provides a blast furnace tuyere plugging device that can realize the prefabrication of gun barrel clay, including prefabricated gun barrel clay 1 and a clay feeding pusher 2 that can cooperate with the prefabricated gun barrel clay 1; the prefabricated gun barrel clay 1 is pressed by a molding mold 3, the prefabricated gun barrel clay 1 has a truncated cone structure, and a positioning recess 1-1 is provided in the prefabricated gun barrel clay 1 located at the large diameter end.

[0029] The connecting end of the mud-feeding pusher 2 is provided with a connecting disc 2-1. The connecting disc 2-1 is provided with a positioning boss 2-2 that matches the positioning recess 1-1. The positioning boss 2-2 on the mud-feeding pusher 2 is inserted into the positioning recess 1-1 of the precast taphole clay 1, and the precast taphole clay 1 is placed into the blast furnace tuyeres. The clearance tolerance between the positioning boss 2-2 and the positioning recess is ≤0.1mm. Preferably, the mud-feeding pusher 2 is 2000 mm long, the connecting disc 2-1 is 120 mm in diameter, and the connecting disc 2-1 is 10 mm thick.

[0030] Preferably, two positioning recesses 1-1 are provided, which are centrally symmetrically distributed and the distance between the two positioning recesses 1-1 is 1 / 3 of the diameter of the large-diameter end. The two centrally symmetrical positioning recesses 1-1 cooperate with the positioning bosses 2-2 of the mud-feeding pusher 2, which can keep the precast gun clay 1 stable during the pushing process, avoid deviation and rotation, and ensure accurate delivery into the blast furnace tuyeres. The symmetrical distribution of the positioning recesses 1-1 and the positioning bosses 2-2 can effectively improve the positioning accuracy of the precast gun clay 1, ensure that it fits tightly against the inner wall of the blast furnace tuyeres, and prevent air leakage. The symmetrical distribution of the two positioning recesses 1-1 makes the precast gun clay 1 more uniform under force, reduces local stress concentration, reduces the risk of damage to the precast gun clay 1 during pushing or use, and extends its service life. The reasonable setting of the distance between the two positioning recesses 1-1 makes the precast gun clay 1 more uniform when subjected to force, avoiding excessive or insufficient local force due to improper spacing of the positioning recesses 1-1, thereby enhancing the stability of the precast gun clay 1 during pushing and use, and preventing it from shifting or rotating.

[0031] Preferably, the depth of the positioning recess 1-1 is 1 / 4 to 1 / 6 of the height of the precast clay 1. This ensures a tight fit between the positioning boss 2-2 and the positioning recess 1-1, maintaining the stability of the precast clay 1 during the pushing process, while preventing the positioning boss 2-2 from being difficult to embed or the precast clay 1 from being unevenly stressed due to excessive depth, thus ensuring the smooth operation of the air vent blocking. Reasonably controlling the depth of the positioning recess 1-1 avoids the precast clay 1 from developing a weak internal structure and being easily damaged during use due to an excessively deep positioning recess 1-1, ensuring the overall strength and stability of the precast clay 1. A moderate depth design facilitates the smooth demolding of the precast clay 1 from the molding mold 3, avoiding demolding difficulties or damage to the precast clay 1 during demolding due to an excessively deep positioning recess 1-1, thereby improving production efficiency.

[0032] Preferably, the large end diameter of the precast taphole clay 1 ranges from 150 to 200 mm, the cone angle of the precast taphole clay 1 is from 15° to 25°, and the height of the precast taphole clay 1 is from 200 to 300 mm. The large end diameter of the precast taphole clay 1, designed to be 150 to 200 mm, can well adapt to the size requirements of most blast furnace tuyeres, ensuring that the precast taphole clay 1 can be smoothly placed into the tuyeres and tightly adhere to the inner wall, preventing air leakage. The height of the precast taphole clay 1, 200 to 300 mm, meets the actual operational requirements of blast furnace tuyeres plugging, ensuring sufficient sealing of the tuyeres without wasting material due to excessive height or affecting the plugging effect due to insufficient height. The cone angle of 15° to 25° ensures a tight fit between the precast taphole clay 1 and the inner wall of the tuyeres, facilitates the molding and demolding of the precast taphole clay 1, and better adapts to the shape of the tuyeres' inner wall during the pushing process, reducing adjustment time.

[0033] Furthermore, such as Figure 3As shown, the molding mold 3 includes a molding barrel 3-1 with an opening at the top. A pressure cap 3-2 is disposed inside the molding barrel 3-1 located on the opening side. The pressure cap 3-2 and the molding barrel 3-1 form a frustum-shaped cavity, the taper of which matches the inner wall of the blast furnace tuyeres. A lifting handle 3-3 is provided at the upper end of the pressure cap 3-2, and a steel protrusion 3-4 for positioning the forming of the recess 1-1 is provided at the lower end of the pressure cap 3-2. The steel protrusion 3-4 is a cylinder with a diameter of 1.5±0.1cm and a height of 5±0.2cm.

[0034] The molding barrel 3-1 and the pressure cap 3-2 combine to form a closed truncated cone-shaped cavity. The precast clay 1 is uniformly deformed under pressure during the molding process, ensuring that the shape of the precast clay 1 accurately fits the inner wall of the air vent, thus improving the quality of air vent sealing. The pressure cap 3-2 is equipped with a lifting handle 3-3, which facilitates the opening and closing of the mold and the demolding of the clay, reducing the intensity of manual operation and improving the convenience of production. The steel protrusion 3-4 of the pressure cap 3-2 can form a positioning recess 1-1 on the precast clay 1, which, together with the positioning boss 2-2 of the clay feeding push rod 2, ensures precise positioning, avoids displacement, and improves the success rate of air vent sealing.

[0035] Preferably, the diameter of the pressure cap 3-2 is smaller than the diameter of the opening of the molding barrel 3-1. During the pressing and molding process, the pressure can be better transferred to the clay, ensuring the molding quality and dimensional accuracy of the precast clay 1.

[0036] Follow these steps during implementation:

[0037] 1. Fill the molding mold cavity 3 with a moisture content of 18% to 22% of the tapping clay;

[0038] 2. Press down the cap 3-2 to the limit, and the steel protrusion 3-4 forms a positioning recess with a depth of 50 mm in the clay.

[0039] 3. After demolding, the positioning boss 2-2 is precisely inserted into the positioning recess, and the clay is placed into the air vent by hand.

[0040] As a result of the above technical solution, the precast blasting clay 1 is pre-pressed by the molding mold 3, eliminating the need for on-site mixing and shaping. It is directly pushed by the clay feeding pusher 2, which quickly completes the air vent blocking operation, improves the air vent blocking efficiency and quality, and reduces material costs.

[0041] The precast plugging clay 1 is pre-pressed into a truncated cone structure in the molding mold 3, eliminating the need for on-site material collection, mixing, and shaping. Precast production reduces the preparation time for plugging materials by 70%, significantly shortens on-site operation time, and improves emergency repair efficiency.

[0042] The precast taphole clay 1 has a truncated cone-shaped structure that fits tightly against the inner wall of the blast furnace tuyeres. The positioning recess 1-1 and the positioning protrusion 2-2 of the clay feeding pusher 2 are precisely matched, solving the problem of axial offset in traditional manual pushing. This ensures accurate and stable positioning during the pushing process, effectively avoids air leakage, and ensures the safe operation of the blast furnace.

[0043] Prefabricated gun clay has a regular shape and precise size, which avoids overfilling, reduces the amount of material used per batch, and improves utilization. At the same time, it avoids the loss and performance degradation of bulk gun clay during storage and transportation, further saving costs.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blast furnace tuyeres plugging device capable of prefabricating taphole clay, characterized in that, It includes precast gun clay and a feeding rod that can cooperate with the precast gun clay; the precast gun clay is pressed by a molding mold and has a truncated cone structure, with a positioning recess provided in the precast gun clay at the large-diameter end. The connecting end of the mud feeding pusher is provided with a connecting disc, and the connecting disc is provided with a positioning boss that matches the positioning recess. The positioning boss on the mud feeding pusher is inserted into the positioning recess of the precast taphole mud, and the precast taphole mud is placed into the blast furnace tuyeres.

2. The blast furnace tuyeres plugging device capable of prefabricating taphole clay according to claim 1, characterized in that, The molding die includes a molding barrel with an opening at the top, and a pressure cap is provided inside the molding barrel on the side of the opening. The pressure cap and the molding barrel form a truncated cone-shaped cavity, and the taper of the truncated cone-shaped cavity matches the inner wall of the blast furnace tuyeres. The upper end of the pressure cap is provided with a lifting handle, and the lower end of the pressure cap is provided with a steel protrusion for positioning the recessed cavity.

3. The blast furnace tuyeres plugging device capable of prefabricating taphole clay according to claim 2, characterized in that, The diameter of the cap is smaller than the diameter of the opening of the molded barrel.

4. The blast furnace tuyeres plugging device capable of prefabricating taphole clay according to claim 1, characterized in that, Two positioning recesses are provided, which are centrally symmetrically distributed, and the distance between the two positioning recesses is 1 / 3 of the diameter of the larger diameter end.

5. The blast furnace tuyeres plugging device capable of prefabricating taphole clay according to claim 1, characterized in that, The depth of the positioning recess is 1 / 4 to 1 / 6 of the height of the precast clay.

6. The blast furnace tuyeres plugging device capable of prefabricating taphole clay according to claim 1, characterized in that, The large end diameter of the precast gun clay ranges from 150 to 200 mm, the cone angle of the precast gun clay is from 15° to 25°, and the height of the precast gun clay is from 200 to 300 mm.

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