Corundum ball drying bin with stirring device

Abstract

This utility model discloses a drying chamber for corundum green balls with a stirring device, including a drying drum and a stirring device. The drying drum has a feed inlet at the top and a discharge outlet at the bottom. A vibrating screen is installed below the discharge outlet. An air outlet is located on the wall of the drying drum near the top. The stirring device includes a stirring shaft inside the drying drum and a stirring arm connected to the stirring shaft. Both the stirring shaft and the stirring arm have a hollow structure. Hot air is connected to the outside of the stirring shaft, and the stirring arm and the portion of the stirring shaft below its connection point with the stirring shaft have through holes communicating with the hollow structure. This utility model can effectively avoid drying dead zones, evenly distribute the hot air flow field inside the drying drum, ensure the drying effect of the corundum green balls, and improve drying uniformity.

Description

Technical Field

[0001] This utility model relates to the field of preparation and processing of tabular corundum, specifically to a drying chamber for green corundum balls with a stirring device. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Tabular alumina is made from high-purity, high-quality industrial alumina raw materials used in metallurgy, and is rapidly fired in a vertical kiln at 1850-1950℃. It possesses excellent thermal shock resistance, extremely high refractoriness, and superior creep and spalling resistance, making it widely used in refractory products in the steel, ceramics, and casting industries. Unlike fused alumina, tabular alumina utilizes clean energy and is obtained through high-temperature vertical kiln firing. During the firing process, it undergoes thorough secondary crystallization at ultra-high temperatures, resulting in grain sizes generally larger than 80-150μm, exhibiting a hexagonal plate-like structure in two-dimensional space, containing numerous closed pores. These closed pores, smaller than 10μm, significantly enhance the thermal shock resistance and spalling resistance of tabular alumina products. Well-developed large-sized α-Al₂O₃ crystals improve the creep resistance of refractory products. Simultaneously, high-purity raw materials and strict impurity control during production ensure the product's volume stability and reheat shrinkage.

[0004] The production process of corundum involves first grinding it into fine powder, then forming it into pellets in a pelletizing tank. During pelletizing, 20%-23% water is added, but no other sintering aids are introduced. The pellets are then fired in a high-temperature vertical kiln. The firing temperature of a conventional vertical kiln is very high, requiring 1850-1950℃. Due to the high firing temperature, the corundum pellets are in a semi-molten state inside the kiln. If the pellets are not added properly or if the kiln is not well-ventilated, clumping will occur. Therefore, it is essential to thoroughly dry the moisture inside the green pellets to prevent pellet explosions and kiln blockage.

[0005] Currently, conventional drying chambers introduce hot air from both the bottom and top, then draw the hot air out from the top in a counter-current heat exchange manner. However, this method can lead to uneven drying, resulting in some green pellets drying poorly and causing them to explode and clog the kiln upon arrival. Therefore, a drying chamber with better drying performance is needed to avoid this situation. Utility Model Content

[0006] To address the aforementioned technical problems and shortcomings in this field, this utility model provides a drying chamber for green corundum balls with a stirring device, which can effectively avoid drying dead zones and ensure the drying effect of green corundum balls.

[0007] The specific technical solution is as follows:

[0008] A drying chamber for green corundum pellets with a stirring device includes a drying barrel and a stirring device;

[0009] The drying drum has a feed inlet at the top and a discharge outlet at the bottom; a vibrating screen is installed below the discharge outlet; and an air outlet is provided on the wall of the drying drum near the top.

[0010] The stirring device includes a stirring shaft disposed inside the drying barrel and a stirring arm connected to the stirring shaft; the stirring shaft and the stirring arm have a hollow structure that communicates with each other, the stirring shaft is connected to hot air, and the stirring arm and the part of the stirring shaft below the connection point of the stirring arm on the stirring shaft are provided with through holes that communicate with the hollow structure.

[0011] In the aforementioned drying chamber for corundum green balls equipped with a stirring device, the screen does not vibrate during startup. The corundum green balls are fed into the chamber through the inlet and begin to accumulate on the screen until the drying chamber is almost full. Hot air is then introduced to begin stirring. During the stirring process, hot air flows out through the through-hole to dry the corundum green balls. An external exhaust device can be connected to the air outlet to extract the hot air from the drying chamber. During continuous operation, the screen vibrates to discharge the material, and the broken material is screened out to prevent it from entering the subsequent kiln. At the same time, new corundum green balls are fed into the inlet. The corundum green balls have a relatively long residence time in the drying chamber (e.g., up to 4 to 8 hours) and are completely dried when they leave the drying chamber.

[0012] Preferably, the drying chamber for corundum green balls with a stirring device has a shuttle-shaped structure with small ends and a large diameter in the middle. This structural design ensures that the hot air has sufficient time to contact the corundum green balls, thus ensuring the drying effect.

[0013] Preferably, in the aforementioned drying chamber for corundum green pellets with a stirring device, the barrel wall of the drying drum has a two-layer structure, with a fiber blanket filling the space between the two layers for heat preservation.

[0014] Preferably, in the aforementioned drying chamber for corundum green pellets with a stirring device, the inner wall of the drying drum has protrusions to turbulent the hot air. The purpose of the protrusions is to increase the resistance as the hot air rises along the inner wall of the drying drum, thereby fully dispersing the hot air inside the drying drum and ensuring the drying effect.

[0015] Preferably, in the described drying chamber for corundum green pellets with a stirring device, the inner wall of the drying drum is provided with multiple layers of raised rings from bottom to top to turbulent the hot air. The purpose of the raised rings is to increase the resistance as the hot air rises along the inner wall of the drying drum, thereby fully dispersing the hot air inside the drying drum and ensuring the drying effect.

[0016] Preferably, in the drying chamber for corundum green balls with a stirring device, the distance between two adjacent layers of raised rings is 10-15 cm.

[0017] Preferably, in the described drying chamber for corundum green pellets with a stirring device, the convex ring is formed by welding a semi-cylindrical steel strip to the inner wall of the drying drum. The semi-circular surface of the semi-cylindrical steel strip protrudes towards the axis of the drying drum to turbulent the hot air. The purpose of the protrusion is to increase the resistance as the hot air rises along the inner wall of the drying drum, thereby fully dispersing the hot air inside the drying drum and ensuring the drying effect.

[0018] Preferably, in the drying chamber for corundum green pellets with a stirring device, the diameter of the semi-cylindrical steel bar is 4-6 cm.

[0019] Preferably, the drying chamber for corundum green pellets with a stirring device has multiple air outlets that are evenly arranged circumferentially on the wall of the drying chamber. This ensures that the exhaust gas after drying is evenly discharged from the drying chamber, which is conducive to the uniform distribution of the hot air flow field in the drying chamber, ensuring drying uniformity and guaranteeing the drying effect.

[0020] Preferably, in the drying chamber for corundum green balls with a stirring device, a wind cap is provided on the stirring shaft. The wind cap is positioned below the air outlet and above the stirring arm. The outer edge of the wind cap is lower than the connection point of the wind cap on the stirring shaft. This design prevents the hot air from being directly drawn out of the air outlet, increasing the flow distance of the hot air and its residence time in the drying chamber, thus ensuring the drying effect.

[0021] Preferably, in the drying chamber for corundum green balls equipped with a stirring device, the stirring arm is located in the lower middle part of the drying drum. The lower middle part of the drying drum is a high-temperature zone, and the upper part is a preheating zone, ensuring that the corundum green balls will not explode when they enter the drying drum, and that the hot air exchanges heat with the corundum green balls flowing downwards in a countercurrent flow.

[0022] Preferably, in the drying chamber for corundum green pellets with a stirring device, the end of the stirring arm away from the stirring shaft is lower than the end of the stirring arm connected to the stirring shaft.

[0023] Preferably, the drying chamber for corundum green pellets with stirring device has at least two layers of stirring arms distributed vertically on the stirring shaft, with multiple stirring arms evenly distributed circumferentially in each layer, which is beneficial for the uniform distribution of hot air in three-dimensional space.

[0024] Preferably, in the drying chamber for corundum green pellets with a stirring device, bearings are installed at the top and bottom of the stirring shaft, wherein the top bearing is externally connected to a reducer via a belt drive mechanism, and the reducer is connected to a drive motor. Driven by the drive motor, the stirring shaft rotates through the reducer and belt drive mechanism.

[0025] Preferably, in the drying chamber for corundum green pellets with a stirring device, the bearing at the top of the stirring shaft is located inside a protective cover to prevent damage to the bearing and the bearing-connecting components, such as belt drive mechanisms, when adding corundum green pellets.

[0026] Preferably, in the drying chamber for corundum green pellets with a stirring device, the bottom end of the stirring shaft is connected to hot air.

[0027] Compared with the prior art, the advantages of this utility model are as follows:

[0028] This invention provides a drying chamber for green corundum balls with a stirring device, which can effectively avoid drying dead zones, evenly distribute the hot air flow field inside the drying chamber, ensure the drying effect of green corundum balls, and improve drying uniformity. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a drying chamber for green corundum balls with a stirring device in a specific embodiment;

[0030] Figure 2 This is a top view schematic diagram of the stirring shaft and stirring arm of a drying chamber for corundum green pellets with a stirring device in a specific embodiment. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0032] See Figure 1A drying chamber for corundum green pellets with a stirring device includes a drying barrel 1 and a stirring device. The drying barrel 1 has a shuttle-shaped structure with a smaller diameter at both ends and a larger diameter in the middle. A feed inlet 2 is located at the top of the drying barrel 1, and a discharge outlet 3 is located at the bottom. A vibrating screen 6 is installed below the discharge outlet 3. The barrel wall of the drying barrel 1 has a two-layer steel plate structure, with a 20cm layer of aluminum silicate fiber blanket 7 filling the space between the two layers for insulation. Four circumferentially evenly arranged air outlets 10 are located near the top of the wall of the drying barrel 1. Multiple layers of raised rings 8 are installed on the inner wall of the drying barrel 1 from bottom to top, with a distance of 10-15cm between adjacent layers of raised rings 8. The raised rings 8 are formed by welding semi-cylindrical steel strips with a diameter of 5cm onto the inner wall of the drying barrel 1, with the semi-circular surface of the semi-cylindrical steel strips facing the axis of the drying barrel 1 to form a protrusion. The stirring device includes a vertical steel stirring shaft 4 (DN300, 10mm wall thickness) located at the center inside the drying barrel 1, and a fan cap 9 and stirring arm 5 connected obliquely downwards to the stirring shaft 4. The stirring shaft 4 and stirring arm 5 have a hollow structure that is connected to each other. Hot air is connected to the bottom end of the stirring shaft 4. Multiple rows of through holes 16, each 10mm in diameter and 10mm apart, are evenly distributed around the stirring arm 5 and the portion below its connection point on the stirring shaft 4, communicating with the hollow structure. Hot air enters from the bottom end of the stirring shaft 4, passes through the hollow structure, exits the stirring shaft 4 and stirring arm 5 through the through holes 16, and enters the drying barrel 1 to dry the corundum green balls. The air cap 9 is welded from an 8mm thick steel plate. Its position is below the air outlet 10 and above the stirring arm 5. The outer edge of the air cap 9 is lower than its connection point on the stirring shaft 4. This design prevents hot air from being directly discharged from the air outlet 10, increasing the airflow distance and residence time within the drying drum 1, thus ensuring optimal drying performance. The end of the stirring arm 5 furthest from the stirring shaft 4 is lower than the end connected to the stirring shaft 4. The stirring arm 5 has two layers, located in the lower middle part of the drying drum 1. Figure 2 As shown, each layer has four circumferentially evenly distributed DN150 stirring arms, which facilitates the uniform distribution of hot air in three-dimensional space. The lower part of the drying drum 1 is the high-temperature zone, and the upper part is the preheating zone, ensuring that the corundum green balls do not explode when they enter the drying drum 1. The hot air exchanges heat with the corundum green balls from top to bottom in a countercurrent manner. Bearings are installed at the top and bottom of the stirring shaft 4, with the top bearing 15 located inside the protective cover 14 and connected to a reducer 12 via a belt drive mechanism 11. The reducer 12 is connected to a drive motor 13. Driven by the drive motor 13, the stirring shaft 4 rotates through the reducer 12 and the belt drive mechanism 11.

[0033] In the aforementioned drying chamber for corundum green balls equipped with a stirring device, the screen 6 can be started without vibration. The corundum green balls are fed into the drying chamber 1 through the feed inlet 2 and begin to accumulate on the screen 6 until the drying chamber 1 is almost full. Hot air is then introduced to start stirring. During the stirring process, hot air flows out from the through hole 16 to dry the corundum green balls. The air outlet 10 can be connected to an external exhaust device to extract the hot air from the drying chamber 1. During continuous operation, the screen 6 vibrates to discharge the material, and the broken material is screened out to prevent it from entering the subsequent kiln. At the same time, new corundum green balls are fed into the drying chamber 1 through the feed inlet 2. The corundum green balls have a relatively long residence time in the drying chamber 1 (for example, up to 4 to 8 hours), and they are dried completely when they leave the drying chamber 1.

[0034] Furthermore, it should be understood that after reading the above description of this utility model, those skilled in the art can make various alterations or modifications to this utility model, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A drying chamber for green corundum pellets with a stirring device, characterized in that, Includes the drying drum and the stirring device; The drying drum has a feed inlet at the top and a discharge outlet at the bottom; a vibrating screen is installed below the discharge outlet; and an air outlet is provided on the wall of the drying drum near the top. The stirring device includes a stirring shaft disposed inside the drying barrel and a stirring arm connected to the stirring shaft; the stirring shaft and the stirring arm have a hollow structure that communicates with each other, the stirring shaft is connected to hot air, and the stirring arm and the part of the stirring shaft below the connection point of the stirring arm on the stirring shaft are provided with through holes that communicate with the hollow structure.

2. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, The drying drum has a shuttle-shaped structure with small ends and a large diameter in the middle; The drying drum has a two-layer structure, with a fiber blanket filling the space between the two layers for insulation.

3. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, The inner wall of the drying drum has protrusions to turbulent the hot air.

4. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, The inner wall of the drying drum is provided with multiple layers of raised rings from bottom to top to turbulent the hot air. The distance between two adjacent layers of convex rings is 10-15cm; The convex ring is formed by welding a semi-cylindrical steel strip to the inner wall of the drying drum, and the semi-circular surface of the semi-cylindrical steel strip protrudes towards the axis of the drying drum. The diameter of the semi-cylindrical steel bar is 4 to 6 cm.

5. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, There are multiple air outlets, which are evenly arranged circumferentially on the wall of the drying drum.

6. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, A wind cap is provided on the stirring shaft. The wind cap is positioned below the air outlet and above the stirring arm. The outer edge of the wind cap is lower than the connection point of the wind cap on the stirring shaft, so that when the hot air rises in the drying drum, it is blocked by the wind cap and flows downward before being discharged.

7. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, The stirring arm is located in the lower middle part of the drying barrel; The end of the stirring arm that is away from the stirring shaft is lower than the end of the stirring arm that is connected to the stirring shaft.

8. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, The stirring shaft has at least two layers of stirring arms distributed vertically, and each layer has multiple stirring arms evenly distributed circumferentially.

9. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, Bearings are provided at the top and bottom of the stirring shaft, wherein the top bearing is connected to a reducer via a belt drive mechanism, and the reducer is connected to a drive motor; The bearing at the top of the stirring shaft is located inside the protective cover.

10. The drying chamber for corundum green pellets with a stirring device according to claim 1, characterized in that, The bottom end of the stirring shaft is connected to a hot air source.

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