A rotary kiln screw blade structure

Abstract

The utility model relates to a kind of rotary kiln helical blade structure, to solve the traditional rotary kiln helical blade is often fixed in kiln body inner wall by kiln brick or other fixed mode directly, it is very inconvenient when disassembling maintenance, operation is complicated and easy to damage kiln body structure, replacement efficiency is low, and the technical problem of high maintenance cost, including kiln body, outer blade and inner blade, the inside wall of kiln body is provided with several insertion slots, the side wall edge of outer blade is fixedly connected with several insertion rods, insertion rod is movably inserted in the inside of insertion slot, the outside wall edge of outer blade is attached with the inner wall of kiln body, and outer blade is fixedly connected with one end of cross bar, the other end of cross bar is fixedly connected with main arc plate, the utility model simplifies dismounting process, can replace damaged outer blade in section, significantly reduce maintenance time and cost, solve the problem of low replacement efficiency of traditional integral blade, resource waste.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary kiln equipment, specifically to a rotary kiln spiral blade structure. Background Technology

[0002] Rotary kilns, as an important industrial thermal equipment, are widely used in industries such as non-ferrous smelting, iron and steel metallurgy, chemical industry, cement, building materials, and refractory materials. They are used for heat treatment processes such as drying and roasting of bulk or slurry materials. In rotary kilns, the spiral blades are one of the key components, undertaking the important functions of material conveying, mixing, and promoting heat exchange between materials and hot gas.

[0003] Traditional rotary kiln spiral blades are often directly fixed to the kiln body wall using kiln bricks or other fixing methods. This connection method is very inconvenient when disassembling and maintaining the blades. When the blades need repair due to wear or corrosion, the entire section of kiln bricks must be removed or cutting operations must be performed. This operation is cumbersome and can easily damage the kiln structure, resulting in long downtime and high maintenance costs. Taking a rotary kiln in a cement plant as an example, when the spiral blades need to be replaced due to local wear, it may require a 3-5 day shutdown for kiln brick removal and reconstruction, which seriously affects the continuity of production and the cost of each maintenance is high. Therefore, a new spiral blade structure is proposed to solve this problem. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a rotary kiln spiral blade structure to solve the technical problems of traditional rotary kiln spiral blades being directly fixed to the inner wall of the kiln body by kiln bricks or other fixing methods, which are very inconvenient to disassemble, maintain and repair, cumbersome to operate and easy to damage the kiln body structure, and have low replacement efficiency and high maintenance costs.

[0005] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: a rotary kiln spiral blade structure is designed, including a kiln body, outer blades and inner blades. The inner sidewall of the kiln body is provided with several slots. Several insert rods are fixedly connected to the sidewall edge of the outer blade. The insert rods are movably inserted into the inner side of the slots. The outer sidewall edge of the outer blade is in contact with the inner wall of the kiln body. The outer blade is fixedly connected to one end of a crossbar. The other end of the crossbar is fixedly connected to a main arc plate. The main arc plate is in contact with the central rod.

[0006] In this solution, slots are set on the inner wall of the kiln body, and insert rods are set on the edge of the outer blades. During installation, the insert rods are inserted into the slots, and the main arc plate is supported after the subsequent installation of the center rod, which ensures the fit and fixation of the outer blades with the kiln body. This simplifies the disassembly and assembly process, allows for the replacement of damaged outer blades in sections, and significantly reduces maintenance time and costs.

[0007] Preferably, a fixing ring is fixedly connected to the opening of the kiln body, a support plate is detachably connected to the surface of the fixing ring, and a center rod is detachably connected to the center of the side wall facing the inside of the kiln body of the support plate.

[0008] In practical applications, the support plates support the central rod from both ends to ensure its stability.

[0009] Preferably, the inner blade is fixedly connected to the secondary arc plate, the secondary arc plate is in contact with and fits against the outer surface of the central rod, and the two ends of the inner blade are respectively provided with a limiting groove and a limiting block.

[0010] In practical applications, when the inner blades are installed on the center rod, the adjacent two inner blades will be inserted into the limiting groove by the limiting block, which greatly improves the stability of the two adjacent inner blades.

[0011] Preferably, a fixing bolt is threadedly connected to the inner side of the groove on the surface of the sub-arc plate, and the fixing bolt passes through the surface of the sub-arc plate and is threadedly connected to the central rod.

[0012] In practical applications, the fixing bolts tightly connect the secondary arc plate to the central rod, ensuring the stability of the inner blade.

[0013] Preferably, the central rod passes through the center of the inner side of the kiln body and contacts the main arc plate along the way. The main arc plate is in contact with the outer surface of the central rod, and the inner wall of the kiln body at both ends of the main arc plate is fixedly connected with a stop block.

[0014] In practical applications, after the center rod is inserted, the main arc plate and crossbar have supporting components, which can tightly hold the outer blade in place, ensuring the stability of the outer blade.

[0015] Preferably, a constraint groove is formed on the outer surface of the central rod, and the bottom protrusion of the inner blade on one side of the limiting groove is inserted into the inner side of the constraint groove.

[0016] In practical applications, the constraint groove facilitates the positioning and installation of the inner blades, while also constraining the inner blades and improving their stability.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model provides slots on the inner wall of the kiln body and insert rods on the edge of the outer blades. During installation, the insert rods are inserted into the slots, and the main arc plate is held in place after the installation of the central rod. This ensures the fit and fixation of the outer blades to the kiln body, simplifies the disassembly and assembly process, allows for the segmented replacement of damaged outer blades, significantly reduces maintenance time and costs, and solves the problems of low efficiency and resource waste in traditional integral blade replacement.

[0019] 2. This utility model uses a central rod to hold the outer arc plate in place, and the surface of the central rod can also be fitted with inner blades. The spiral directions of the inner and outer blades intersect, so when the kiln rotates to transport materials, the materials can be rolled and moved irregularly. This design improves the uniformity of mixing materials with hot air and the efficiency of heat exchange. At the same time, the supporting structure of the central rod enhances the overall rigidity and improves the stability of the structure. Attached Figure Description

[0020] Figure 1 This is an external schematic diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the inner structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure at the center rod of this utility model;

[0023] Figure 4 This is a diagram showing the positional relationship between the outer blades and the kiln body of this utility model;

[0024] Figure 5 This is a schematic diagram of the main blade structure of this utility model;

[0025] Figure 6 This is a partial enlarged view of point A of this utility model;

[0026] In the diagram: 1. Kiln body; 101. Slot; 2. Fixing ring; 3. Support plate; 4. Outer blade; 401. Insert rod; 402. Crossbar; 5. Main arc plate; 6. Secondary arc plate; 7. Fixing bolt; 8. Center rod; 801. Limiting groove; 802. Limiting block; 803. Constraint groove; 9. Inner blade; 10. Stop block. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] Example 1: A rotary kiln spiral blade structure, see [link to example]. Figures 1 to 6The system includes a kiln body 1, outer blades 4, and inner blades 9. Several slots 101 are provided on the inner wall of the kiln body 1. Several insert rods 401 are fixedly connected to the edge of the side wall of the outer blades 4. The insert rods 401 are movably inserted into the inner side of the slots 101. The insert rods 401 are made of high-strength tool steel, and there is a very small gap between them when inserted into the slots 101, ensuring smooth assembly and preventing jamming due to thermal expansion. During installation, the outer blades 4 are moved into the interior of the kiln body 1, and then the insert rods 401 on their outer side are aligned with the inner wall of the kiln body 1. After full insertion, the outer blades 4 will fit snugly against the inner wall of the kiln body 1. The edges of the slots 101 are rounded to prevent stress concentration and crack propagation. 01 The inner wall is plated with hard chrome to improve wear resistance; the inner walls of the kiln body 1 at both ends of the main arc plate 5 are fixedly connected with baffles 10. The outer edge of the outer wall of the outer blade 4 is in contact with the inner wall of the kiln body 1. The baffles 10 can block the two ends of the outer blade 4 to prevent the two ends of the outer blade 4 from being deformed by the impact of the material. It should be noted that the baffles 10 are located behind the outer blade 4, that is, towards the rotary kiln outlet, so as to support the outer blade 4 from the rear. The outer blade 4 is set in a segmented state, which is convenient for installation, maintenance, replacement and upkeep. It is not necessary to replace the entire section of the outer blade 4, only the damaged part needs to be replaced, which is convenient and practical.

[0029] It is worth mentioning that the kiln body 1 is made of high-temperature resistant stainless steel or nickel-based alloy, and its inner surface is coated with tungsten carbide to enhance wear resistance and high-temperature oxidation resistance, adapting to the harsh environment of long-term high temperature and corrosive gases inside the rotary kiln.

[0030] Specifically, such as Figure 1 As shown, a fixing ring 2 is fixedly connected to the opening of the kiln body 1. A support plate 3 is detachably connected to the surface of the fixing ring 2. A central rod 8 is detachably connected to the center of the side wall of the support plate 3 facing the inside of the kiln body 1. Although the central rod 8 is connected to the support plate 3, it can actually be detached from the support plate 3. For example, the central rod 8 is connected to the support plate 3 by bolts, which are only loosened when disassembly is required. It is kept tight at other times to prevent the central rod 8 from sliding. The fixing ring 2 mainly protects the outer edge of the kiln body 1 and also facilitates the installation of the support plate 3, providing support for the support plate 3. The support plate 3 mainly supports the central rod 8, allowing the support rod to pass through the kiln body 1 and simultaneously support and hold several main arc-shaped plates 5.

[0031] It should be noted that the kiln body 1 here refers to the location of the rotary kiln opening, which can be either the inlet or the outlet. Several outer blades 4 can be installed on its inner side according to the actual length. The central rod 8 runs through the inlet and outlet and is limited and supported by the support rods installed at both ends of the rotary kiln. If the central rod 8 needs to be removed, the support rods at both ends need to be removed first. The outer blades 4 are designed in sections, with a few millimeters of expansion joint between adjacent sections to avoid the accumulation of structural stress caused by thermal expansion, and at the same time facilitate local replacement.

[0032] Specifically, such as Figure 4 and Figure 5 As shown, the outer blade 4 is fixedly connected to one end of the crossbar 402, and the other end of the crossbar 402 is fixedly connected to the main arc plate 5. The main arc plate 5 is in contact with the central rod 8, and the curvature of the main arc plate 5 is consistent with the outer wall of the central rod 8. Therefore, the central rod 8 can pass through several main arc plates 5 normally and reach the other end of the kiln body 1. The central rod 8 passes through the center of the inner side of the kiln body 1 and contacts the main arc plates 5 along the way. The main arc plate 5 is in contact with the outer surface of the central rod 8. After the central rod 8 passes through, the crossbar 402 and the main arc plate 5 have a support point. At this time, the outer blade 4 will remain stable and cannot be separated from the slot 101. It is tightly in contact with the inner wall of the kiln body 1 to guide and stir the material that enters later.

[0033] Furthermore, such as Figure 2 and Figure 3 As shown, the inner blade 9 is fixedly connected to the auxiliary arc plate 6. The auxiliary arc plate 6 contacts and fits against the outer surface of the central rod 8. Limiting grooves 801 and limiting blocks 802 are respectively opened at both ends of the inner blade 9. A constraint groove 803 is opened on the outer surface of the central rod 8. The bottom protrusion of the inner blade 9 on one side of the limiting groove 801 is inserted into the inner side of the constraint groove 803. When the inner blade 9 is installed, the bottom protrusion is first inserted into the constraint groove 803. When two adjacent inner blades 9 are installed, their ends will contact each other. At this time, the limiting block 802 will be inserted into the limiting groove 801 to improve the stability of the two adjacent inner blades 9. The inner blade 9 and the outer blade 4 are spirally intersecting. Therefore, when the kiln body 1 rotates to transport materials, the materials can be rolled and moved irregularly, allowing the central rod 8 to be integrated into the blade structure while improving the material processing efficiency.

[0034] It is worth noting that a fixing bolt 7 is threadedly connected to the inner side of the groove on the surface of the secondary arc plate 6. The fixing bolt 7 passes through the surface of the secondary arc plate 6 and is threadedly connected to the central rod 8. After the inner blade 9 is inserted into the constraint groove 803, the fixing bolt 7 is screwed into the bolt hole reserved in the groove on the surface of the secondary arc plate 6. The fixing bolt 7 will pass through the secondary arc plate 6 and enter the bolt hole on the surface of the central rod 8, thereby fixing the secondary arc plate 6 to the central rod 8 and ensuring the stability of the inner blade 9.

[0035] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

[0036] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A rotary kiln spiral blade structure, comprising a kiln body (1), outer blades (4), and inner blades (9), characterized in that, The inner wall of the kiln body (1) is provided with a number of slots (101). The side wall edge of the outer blade (4) is fixedly connected with a number of insert rods (401). The insert rods (401) are movably inserted into the inner side of the slots (101). The outer side wall edge of the outer blade (4) is in contact with the inner wall of the kiln body (1). The outer blade (4) is fixedly connected to one end of the crossbar (402). The other end of the crossbar (402) is fixedly connected to the main arc plate (5). The main arc plate (5) is in contact with the center rod (8).

2. The rotary kiln spiral blade structure as described in claim 1, characterized in that, A fixing ring (2) is fixedly connected to the opening of the kiln body (1). A support plate (3) is detachably connected to the surface of the fixing ring (2). A center rod (8) is detachably connected to the center of the side wall of the support plate (3) facing the inside of the kiln body (1).

3. The rotary kiln spiral blade structure as described in claim 1, characterized in that, The inner blade (9) is fixedly connected to the secondary arc plate (6), the secondary arc plate (6) is in contact with and fits against the outer surface of the central rod (8), and the two ends of the inner blade (9) are respectively provided with a limiting groove (801) and a limiting block (802).

4. The rotary kiln spiral blade structure as described in claim 3, characterized in that, The inner side of the groove on the surface of the sub-arc plate (6) is threaded with a fixing bolt (7), which penetrates the surface of the sub-arc plate (6) and is threadedly connected to the central rod (8).

5. The rotary kiln spiral blade structure as described in claim 2, characterized in that, The central rod (8) passes through the center of the inner side of the kiln body (1) and contacts the main arc plate (5) along the way. The main arc plate (5) is attached to the outer surface of the central rod (8). The inner walls of the kiln body (1) at both ends of the main arc plate (5) are fixedly connected with blocks (10).

6. The rotary kiln spiral blade structure as described in claim 4, characterized in that, The outer surface of the center rod (8) is provided with a constraint groove (803), and the bottom of the inner blade (9) on one side of the limiting groove (801) is protruded and inserted into the inner side of the constraint groove (803).

Images