Large 2205 / 2507 duplex stainless steel static mixer

Abstract

A large 2205 / 2507 duplex stainless steel static mixer can effectively solve the problems of improving the product quality and prolonging the service life and comprises flange plates, a pipe body and an SK type spiral blade, the pipe body is a hollow pipe body which is made of 2205 / 2507 duplex stainless steel, the inner diameter of the pipe body is DN700, the wall thickness of the pipe body is 10 mm, the corresponding faces of the upper flange plate and the lower flange plate are perpendicularly welded to the two ends of the pipe body respectively, and the SK type spiral blade is arranged in the pipe body. The SK type spiral blades are formed by pressing 2205 / 2507 duplex stainless steel plates through a mold, the multiple SK type spiral blades are alternately, sequentially and evenly positioned and welded to the inner wall of the pipe body in the axial direction of the center of the pipe body, the left spiral angle and the right spiral angle are equal, and the large 2205 / 2507 duplex stainless steel static mixer is formed. The mold is simple, novel, unique, scientific and reasonable in structure, good in product quality and long in service life, materials can be mixed more uniformly when passing through the SK type helical blade pressed by the mold through correct installation of the upper flange plate, the lower flange plate and a groove body feeding system, the feeding amount is increased, the production efficiency is improved, and the mold is an innovation on static mixer equipment and has remarkable economic and social benefits.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and in particular to a large 2205 / 2507 duplex stainless steel static mixer for use in a high-efficiency alumina thickener. Background Technology

[0002] The alumina high-efficiency thickener (hereinafter referred to as the thickener) is one of the important pieces of equipment in the slurry treatment process of the alumina industry. Its main function is to separate solid particles and liquid in the slurry, thereby increasing the solid content and facilitating subsequent processing and transportation. As a static mixer, the thickener's feeding system is a key supporting equipment. It uses multiple mixing spiral unit blades arranged at a certain angle inside the pipe to change the flow state of the material in the pipe, so as to achieve good dispersion and thorough mixing of the feed slurry. It is called a "static" mixer because there are no moving parts in the pipe, only stationary elements. Its quality and service life directly affect the performance and lifespan of the static mixer, especially with the development of the domestic alumina industry in recent years. With the continuous improvement of production capacity and the increasing size of settling tanks, the feed pipe diameter of static mixers has increased from DN300 to DN700. The pipe body is mostly made of fiberglass or other corrosion-resistant materials. In particular, the spiral blades, an important component of static mixers, are traditionally manufactured by hand-hammering sheet metal. The twist angle of the spiral blades does not meet the design requirements, the dimensional error is large, and there are mechanical hammering pits on the surface, which cannot guarantee product quality and result in a short service life. The technical defects in the structure seriously affect the performance and service life of static mixers, and directly affect the production efficiency and economic benefits of alumina high-efficiency thickeners. Therefore, the improvement and innovation of static mixers are imperative. Utility Model Content

[0003] In view of the above situation and to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a large 2205 / 2507 duplex stainless steel static mixer, which can effectively solve the problem of improving product quality and service life.

[0004] This utility model discloses a large-scale 2205 / 2507 duplex stainless steel static mixer, comprising an upper flange plate, a pipe body, SK-type spiral blades, and a lower flange plate. The pipe body is a hollow pipe body made of 2205 / 2507 duplex stainless steel with an inner diameter of DN700 and a wall thickness of 10mm. The upper and lower flange plates have corresponding circumferential safety positioning grooves on their respective sides. Corresponding bosses are provided at both ends of the pipe body, and the bosses at both ends of the pipe body are placed in the safety positioning grooves. After being positioned by nesting at both ends of the pipe body, the upper and lower flange plates are vertically welded to both ends of the pipe body and heat-treated to eliminate welding stress. The SK-type spiral blades are made of 2205 / 2507 duplex stainless steel plates (hereinafter referred to as steel plates) pressed by a mold. Several SK-type spiral blades are alternately and uniformly positioned and welded to the inner wall of the pipe body along the central axis, with equal left and right spiral angles, thus forming a large-scale 2205 / 2507 duplex stainless steel static mixer.

[0005] This utility model features a simple, novel, and unique structure that is scientifically sound, easy to manufacture, produces high-quality products, and has a long service life. With proper installation of the upper and lower flange plates and the trough feeding system, materials can be mixed more evenly when passing through the SK-type spiral blades pressed by the fixture. Furthermore, the optimized tube shaft dimensions significantly increase the feeding capacity, shorten production preparation time, and improve production efficiency. The structure is rationally designed and easy to use, greatly reducing labor intensity and achieving excellent results. It is suitable for mass production and represents an innovation in static mixer equipment, offering significant economic and social benefits. Attached Figure Description

[0006] Figure 1 This is a front cross-sectional view of the static mixer of the present invention.

[0007] Figure 2 This is a multi-directional (a, b) three-dimensional structural diagram of the SK-type helical blade of the present invention. Detailed Implementation

[0008] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings and specific circumstances.

[0009] This utility model discloses a large-scale 2205 / 2507 duplex stainless steel static mixer, comprising an upper flange plate 1, a pipe body 2, SK-type spiral blades 3, and a lower flange plate 4. The pipe body 2 is a hollow pipe made of 2205 / 2507 duplex stainless steel with an inner diameter of DN700 and a wall thickness of 10mm. The upper flange plate 1 and the lower flange plate 4 have corresponding circumferential safety positioning grooves on their corresponding sides. Corresponding bosses are provided at both ends of the pipe body 2, and the bosses at both ends of the pipe body 2 are placed in the safety positioning grooves. After being positioned by nesting at both ends of the pipe body, the upper flange plate 1 and the lower flange plate 4 are vertically welded to both ends of the pipe body 2, and heat-treated to eliminate welding stress. The SK-type spiral blades are made of 2205 / 2507 duplex stainless steel plates (hereinafter referred to as steel plates) pressed by a mold. Several SK-type spiral blades are alternately and uniformly positioned and welded to the inner wall of the pipe body 2 along the central axis, with equal left and right spiral angles, thus forming a large-scale 2205 / 2507 duplex stainless steel static mixer.

[0010] To ensure effectiveness and ease of use, the SK-type spiral blades are made of spiral plates twisted by 180° or 270°. The blades are left-handed and right-handed, and are alternately and evenly positioned and welded from the middle of the tube body 2 to both ends, with the twist angle of each blade crossing 90° to ensure accurate positioning.

[0011] The vertical error between the upper flange plate 1 and the lower flange plate 4 and the center of the pipe body is ≤0.15mm.

[0012] Both the upper flange plate 1 and the lower flange plate 4 are circular with a through hole in the center, made of 2205 / 2507 duplex stainless steel.

[0013] The surfaces of the upper flange plate 1 and the lower flange plate 4 are polished smooth, without burrs, and the roughness meets the specified requirements.

[0014] The centers of the upper flange plate 1, the lower flange plate 4, and the pipe body 2 are on the same straight line, forming a top-to-bottom channel for material dispersion and uniform mixing with the gaps inside the pipe body 2 and between the SK-type spiral blades.

[0015] The welding fit between the upper flange plate 1 and the lower flange plate 4 and the pipe body 2 should be determined according to the actual size and position of the boss and the positioning groove, and they should be set vertically.

[0016] In the actual production of this utility model, the height of the pipe body 2 is determined according to the material composition and actual production needs. The steel plates of the upper and lower flanges need to be ground on the forming and installation surfaces to make their roughness meet the specified requirements, with smooth surfaces and no burrs. The inner surfaces of the upper flange 1 plate and the lower flange 4 plate are positioned and welded to the pipe shaft by nesting at both ends of the pipe shaft. After welding, heat treatment is performed to eliminate welding stress. Then, several SK-type spiral blades 3 are alternately and evenly positioned and welded from the middle of the pipe body 2 to both ends, and the twist angle of the single blade is 90° in both directions to ensure accurate positioning. The vertical error between the flange plate and the center of the pipe shaft is within 0.15mm.

[0017] When in use, this utility model can replace the original static mixer, which is very convenient. The working condition is the same as the original static mixer, so it will not be described again. This static mixer can also be made into a series of products according to different needs. It has a simple structure, is easy to manufacture, standardizes industrial production, saves manpower and material resources, improves work efficiency, and ensures product quality. According to field tests and experiments, it can save more than 40% of costs and increase production efficiency by 2-3 times. It is an innovation in large stainless steel static mixers in the thickener series and has significant economic and social benefits.

Claims

1. A large 2205 / 2507 duplex stainless steel static mixer, comprising an upper flange plate (1), a pipe body (2), SK-type spiral blades (3), and a lower flange plate (4), wherein the pipe body (2) is a hollow pipe body made of 2205 / 2507 duplex stainless steel with an inner diameter of DN700 and a wall thickness of 10mm, and the upper flange plate (1) and the lower flange plate (4) have corresponding circumferential safety positioning grooves on their respective sides, and corresponding bosses are provided at both ends of the pipe body (2), and the bosses at both ends of the pipe body (2) are positioned in a safety positioning groove. Inside the groove, after being positioned by nesting at both ends of the pipe body, the upper flange plate (1) and the lower flange plate (4) are vertically welded to both ends of the pipe body (2) and heat-treated to eliminate welding stress. The SK type spiral blade (3) is made of 2205 / 2507 duplex stainless steel plate pressed by mold. Several SK type spiral blades are alternately and uniformly positioned and welded to the inner wall of the pipe body along the central axis of the pipe body (2). The left and right spiral angles are equal, forming a large 2205 / 2507 duplex stainless steel static mixer.

2. The large-scale 2205 / 2507 duplex stainless steel static mixer according to claim 1, characterized in that, The SK-type spiral blade (3) is a blade made of a spiral plate twisted by 180° or 270°. The blades are left-handed and right-handed respectively. They are alternately and uniformly positioned and welded from the middle of the tube body (2) to both ends, and the twist angle of a single blade is 90° in both directions to ensure accurate positioning.

3. The large-scale 2205 / 2507 duplex stainless steel static mixer according to claim 1, characterized in that, The vertical error between the upper flange plate (1) and the lower flange plate (4) and the center of the pipe body (2) is ≤0.15mm.

4. The large-scale 2205 / 2507 duplex stainless steel static mixer according to claim 1, characterized in that, The upper flange plate (1) and the lower flange plate (4) are both circular with a through hole in the center, made of 2205 / 2507 duplex stainless steel plate.

5. The large-scale 2205 / 2507 duplex stainless steel static mixer according to claim 1, characterized in that, The surfaces of the upper flange plate (1) and the lower flange plate (4) are polished and smooth, without barbs, and the roughness meets the specified requirements.

6. The large-scale 2205 / 2507 duplex stainless steel static mixer according to claim 1, characterized in that, The centers of the upper flange plate (1), the lower flange plate (4), and the pipe body (2) are on the same straight line, forming a channel from top to bottom for material dispersion and uniform mixing with the gap between the pipe body (2) and the SK-type spiral blade (3).

7. The large-scale 2205 / 2507 duplex stainless steel static mixer according to claim 1, characterized in that, The welding fit between the upper flange plate (1) and the lower flange plate (4) and the pipe body (2) should be determined according to the actual size and position of the boss and the positioning groove, and should be set vertically.

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