Powder secondary grading system
By adopting a positive pressure Roots fan and a gas pipeline acceleration chamber design in the powder secondary grading system, the problem of reducing grading efficiency and inability to deal with ultra-long and ultra-high distance materials in the prior art is solved, and efficient material grading and transportation are achieved.
Patent Information
- Application Number
- CN202421881459.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-05
AI Technical Summary
When the existing powder secondary grading system increases the material conveying volume, the grading efficiency is reduced, making it difficult to effectively lift fine powder particles again, and it is impossible to grade ultra-long and ultra-high distance materials.
Positive pressure Roots fan is used for material transportation and grading, and the gas delivery pipeline and acceleration chamber design can achieve full dispersion and efficient transportation of materials.
The grading efficiency of secondary grading is improved, and the grading of ultra-long and ultra-high distance materials is achieved without the need for additional breakers.
Smart Images
Figure CN222943958U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of secondary classification, in particular to a powder secondary classification system. Background Art
[0002] like Figure 1 As shown, the existing powder secondary classification system includes a silo 01, a secondary classifier 02, a bag collector 03 and an induced draft fan 04 which are arranged in sequence. There are two air inlets at the secondary classifier, one of which is a material feed inlet 021, which brings the material falling into the air duct 05 into the secondary classifier 02 through the negative pressure of the induced draft fan 04; the other air inlet is a make-up air inlet 022, which is located lower than the top surface of the material feed inlet and is opened on the side of the cylinder of the secondary classifier 02. An air valve 023 is provided at the make-up air inlet 022, and the air valve 023 can be used to adjust the air intake volume, so that the fine powder particles that have not passed through the classification wheel and settled together with the coarse powder particles are lifted up again and enter the classification wheel for re-classification. Since there are two air inlets, if the material conveying volume is increased, the air inlet 022 must be closed to ensure that the air volume entering the feed inlet 021 increases. At this time, the material concentration in the secondary classification chamber increases, and the air volume of the air inlet 022 decreases, making it difficult for the fine powder particles that have not passed through the classification wheel and settled with the coarse powder particles to be lifted up again, and are directly discharged from the lower discharge port of the secondary classifier, thereby reducing the classification efficiency of the secondary classifier. In addition, when the silo is unloaded, the materials are agglomerated, and a scatterer is needed to break up the materials when they fall into the air duct so that they can be more fully classified. This process cannot classify materials at very long distances or very high distances. Summary of the invention
[0003] The utility model aims to overcome the deficiencies of the prior art and provide a powder secondary classification system.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A powder secondary classification system comprises a silo, a secondary classifier, a bag collector and an induced draft fan which are arranged in sequence, wherein the top of the secondary classifier is connected to the front end of the side wall of the bag collector through a pipeline, and the rear end of the side wall of the bag collector is connected to the induced draft fan through a pipeline; a feed pipe is provided inside the secondary classifier, and an air inlet arranged below the top surface of the feed pipe is provided on the outside of the secondary classifier, an air valve is connected to the air inlet, an air delivery pipeline is connected to the bottom of the feed pipe of the secondary classifier, the top of the other end of the air delivery pipeline is connected to a feed discharge port at the bottom of the silo, and a positive-pressure Roots blower is connected to the other end of the air delivery pipeline.
[0006] Furthermore, the discharge port at the bottom of the silo is connected to the air delivery pipeline through an acceleration chamber, and the cross-section of the acceleration chamber gradually increases from top to bottom.
[0007] The utility model adopts the above technical solution, and has the following beneficial effects:
[0008] 1. The secondary classification feeding adopts positive pressure Roots blower to bring the material into the secondary classifier for classification. At the same time, the process of air delivery can fully disperse the material, without the need for an additional disperser;
[0009] 2. The use of positive pressure Roots blower can realize ultra-long and ultra-high distance material transportation (horizontal distance can reach more than 100 meters), which is conducive to the unified planning and layout of the complete set of production lines;
[0010] 3. The characteristics of positive pressure Roots blower conveying materials are high wind pressure and small air volume. Therefore, most of the air volume of the induced draft fan enters from the air inlet of the secondary classifier, so that the fine powder particles that have not passed through the classifying wheel and settled with the coarse powder particles are lifted up again and enter the classifying wheel for re-classification, thereby effectively improving the classification efficiency of the secondary classification. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The present invention is further described in detail below with reference to the accompanying drawings and specific implementations:
[0012] Figure 1 It is a schematic diagram of a powder secondary classification system in the prior art;
[0013] Figure 2 It is a schematic diagram of the powder secondary classification system of the utility model. DETAILED DESCRIPTION
[0014] like Figure 2 As shown, the utility model is a powder secondary classification system, comprising a silo 1, a secondary classifier 2, a bag collector 3 and an induced draft fan 4 arranged in sequence, the top of the secondary classifier 2 is connected to the front end of the side wall of the bag collector 3 through a pipeline, and the rear end of the side wall of the bag collector 3 is connected to the induced draft fan 4 through a pipeline. A feed pipe 21 is provided inside the secondary classifier 2, and an air inlet 22 is provided on the outside of the secondary classifier 2 below the top surface of the feed pipe 21, and an air valve 23 is connected to the air inlet 22. The bottom of the feed pipe 21 of the secondary classifier 2 is connected to an air delivery pipeline 5, the top of the other end of the air delivery pipeline 5 is connected to the discharge port at the bottom of the silo 1, and the other end of the air delivery pipeline 5 is connected to a positive pressure Roots blower 6.
[0015] The discharge port at the bottom of the silo 1 is connected to the air delivery pipeline 5 through the acceleration chamber 7, and the cross section of the acceleration chamber 7 gradually increases from top to bottom. The acceleration chamber 7 is designed to be connected to the air delivery pipeline 5 so that the falling materials are dispersed and accelerated with the positive pressure wind to speed up the transportation of the materials.
[0016] The secondary classification feeding in the utility model adopts the positive pressure Roots blower 6 to bring the material into the secondary classifier 2 for classification. At the same time, the material can be fully dispersed during the air delivery process without the need for an additional disperser. The positive pressure Roots blower 6 can be used to achieve ultra-long and ultra-high distance material transportation (the horizontal distance can reach more than 100 meters), which is conducive to the unified planning and layout of the complete set of lines. The characteristics of the positive pressure Roots blower 6 in conveying materials are high wind pressure and small air volume. Therefore, the air valve 23 of the air inlet 22 of the secondary classifier 2 can be opened relatively larger, and more air volume can enter from the air inlet 22, effectively improving the efficiency of the secondary classification.
[0017] The above describes the specific implementation of the present invention, but those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this implementation without departing from the principle and essence of the present invention, but these changes and modifications are all within the scope of protection of the present invention.
Claims
1. A powder secondary classification system, comprising a silo, a secondary classifier, a bag collector and an induced draft fan arranged in sequence, wherein the top of the secondary classifier is connected to the front end of the side wall of the bag collector through a pipeline, and the rear end of the side wall of the bag collector is connected to the induced draft fan through a pipeline; a feed pipe is provided inside the secondary classifier, and an air inlet is provided on the outside of the secondary classifier below the top surface of the feed pipe, and an air valve is connected to the air inlet, characterized in that: The bottom of the feed pipe of the secondary classifier is connected to an air delivery pipeline, the top of the other end of the air delivery pipeline is connected to the discharge port at the bottom of the silo, and the other end of the air delivery pipeline is connected to a positive pressure Roots blower.
2. A powder secondary classification system according to claim 1, characterized in that: The material discharge port at the bottom of the silo is connected to the air delivery pipeline through an acceleration chamber, and the cross section of the acceleration chamber gradually increases from top to bottom.