Adjustable v-type powder concentrator and adjustment method

Abstract

The application discloses an adjustable V-shaped powder concentrator, which comprises a V-shaped shell, air supply ports and fine material collecting ports arranged at two ends of the top of the shell, a coarse material collecting port arranged at the bottom of the shell, a scattering plate and a grading plate arranged in the shell, and an adjusting part movably arranged on the inner wall of the shell close to the grading plate; the adjusting part comprises a flow resistance plate movably connected with the inner wall of the shell; the flow resistance plate is arranged in a fine material discharging channel of the powder concentrator, the precision of the powder concentrator is improved without increasing energy consumption, and the adjusting equipment with the flow resistance plate can adjust the position of the flow resistance plate according to different production requirements, so that the grading efficiency of the V-shaped powder concentrator is adjusted.

Description

Technical Field

[0001] This invention relates to the field of air classifier technology, specifically to an adjustable V-type air classifier and its adjustment method. Background Technology

[0002] V-type air classifiers are among the most widely used gas-solid separation equipment in industry. They have the functions of dispersing, drying, and separating particles, and are mainly used in industries such as chemical, metallurgy, and building materials. V-type air classifiers mainly rely on dispersing plates and grading plates to disperse particles, and are characterized by simple structure, convenient operation, and high screening efficiency.

[0003] In the dispersion zone, particles disperse and settle under gravity. Driven by high-temperature, high-speed gas from the side, fine particles change their trajectory and move towards the classifying plate, while coarse particles are less affected and continue to settle, thus separating the fine and coarse particles. The V-type classifier's internal baffles consist of classifying plates and dispersing plates. The dispersing plates break up the raw material, and the classifying plates, in conjunction with the dispersing plates, sort the raw material. The arrangement of the classifying plates affects the airflow within the V-type classifier, thus influencing the particle sorting effect. To improve the separation efficiency and reduce energy consumption of the V-type classifier, it is necessary to optimize and modify it.

[0004] Patent 213726964U: This invention improves the separation efficiency of the V-type air classifier by installing a receiving box on the lower side of the air classifier and setting up a mounting plate and filter screen in the receiving box. However, this invention aims to increase separation efficiency but does not optimize the energy efficiency of the V-type air classifier, leading to increased energy consumption. Patent 211385800U: This invention adds guide blocks inside the V-type air classifier, continuously increasing the airflow velocity between the guide blocks. This strengthens the screening effect of the airflow as the material falls to the discharge point, improving the screening effect. The invention also includes a second air outlet and a buffer plate, further enhancing the airflow within the machine and improving the screening force. However, this invention does not optimize the energy consumption of the baffle plate. Patent CN 219003335U: This invention enhances the dispersing function of the V-type air classifier by installing several movable dispersing frames that are spliced ​​together to form a dispersing section. However, this scheme does not consider the impact of baffle distribution on energy consumption and staged efficiency.

[0005] Most existing improvements focus on the implementation of a single V-type air classifier, without significantly altering its structure and operating process. While adding guide blocks can increase the classification efficiency of the V-type air classifier, it is difficult to improve the classification accuracy. Adding filters can increase the classification accuracy of the V-type air classifier, but it greatly increases the pressure drop and thus energy consumption. Summary of the Invention

[0006] The purpose of this invention is to provide an adjustable V-type classifier and an adjustment method to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An adjustable V-type classifier includes a V-shaped housing. The top two ends of the housing are respectively provided with an air inlet 1 and a fine material collection port 6, and the bottom of the housing is provided with a coarse material collection port 2. The housing is provided with a dispersing plate 4 and a grading plate 5. An adjustment part is movably arranged on the inner wall of the housing near the grading plate 5.

[0009] The adjustment part includes a flow baffle 14, which is movably connected to the inner wall of the housing.

[0010] As a further embodiment of the present invention: the housing includes an air inlet cylinder and an air outlet cylinder, the air inlet cylinder and the air outlet cylinder are inclinedly connected to form a V-shaped structure, and a discharge port 2 is provided on the upper end of the housing near the air outlet 1, and the dispersing plate 4 is located below the discharge port 2.

[0011] As a further embodiment of the present invention: multiple dispersing plates 4 and multiple grading plates 5 are provided, and the dispersing plates 4 and grading plates 5 are arranged at an inclination towards each other.

[0012] As a further aspect of the present invention: the flow baffle 14 is slidably connected to the inner wall of the housing along the airflow direction, and the flow baffle 14 is rotatably connected to the inner wall of the housing along the sliding direction.

[0013] As a further aspect of the present invention: a sliding groove is provided on the housing, the sliding groove is arranged along the height direction of the housing, a slider 12 is slidably connected in the sliding groove, the slider is connected to the sealing plate 15, and the flow-blocking plate 14 is rotatably connected to the sealing plate 15 and the slider 12 through a rotating shaft 16.

[0014] As a further aspect of the present invention: the lower end of the slider 12 is connected to a telescopic cylinder 13 for driving the baffle plate 14 to rotate, and the piston end of the telescopic cylinder 13 is rotatably connected to the baffle plate 14.

[0015] As a further embodiment of the present invention: the outer wall of the housing is provided with a guide rail 11, the slider 12 is slidably connected to the guide rail 11, the bottom plate of the housing is provided with a driving part for driving the slider 12 to slide on the guide rail 11, the driving part includes a lead screw 10 threadedly connected to the slider 12, the bottom plate of the housing is provided with a motor 7, the transmission shaft of the motor 7 is poweredly connected to a main transmission rod 8, the main transmission rod 8 is provided with transmission teeth, the bottom of the lead screw 10 is fixedly connected with a driven gear 9, and the driven gear 9 meshes with the transmission teeth on the main transmission rod 8.

[0016] As a further aspect of the present invention: multiple sliders 12 are provided, and each slider 12 is rotatably connected to a flow-blocking plate 14 on its inner side, and the slider 12 is connected to a sealing plate 15.

[0017] An adjustable V-type air classifier adjustment method defines materials with a diameter less than or equal to b as fine materials and materials with a diameter greater than b as coarse materials. The adjustment method includes the following steps:

[0018] Step 1: Obtain the classification efficiency η of coarse material with a diameter greater than b at the fine material collection port 6;

[0019] Step 2: Compare the graded efficiency η obtained in Step 1 with the adjustment threshold, then adjust the angle of the baffle plate 14 through the adjustment unit, and repeat Step 1; if it is less than the graded threshold, then execute Step 3.

[0020] Step 3: Adjustment complete.

[0021] As a further aspect of the present invention: the graded efficiency The adjustment thresholds include a coarse adjustment threshold m and a fine adjustment threshold n;

[0022] Step 2 includes the following steps:

[0023] Step 2.1: Determine whether the graded efficiency η obtained in Step 1 is greater than the coarse adjustment threshold m. If it is greater than the coarse adjustment threshold m, then perform coarse adjustment by adjusting the height of the baffle plate 14, and then execute Step 1; if it is less than the coarse adjustment threshold m, then execute Step 2.2.

[0024] Step 2.2: Determine whether the graded efficiency η obtained in Step 1 is greater than the fine-tuning threshold n. If it is greater than the fine-tuning threshold n, fine-tune by adjusting the angle of the baffle plate 14, and then execute Step 1. If it is less than the fine-tuning threshold n, then execute Step 3.

[0025] Compared with the prior art, the beneficial effects of the present invention are: by providing a baffle plate in the fine material discharge channel of the classifier, the present invention improves the accuracy of the classifier without increasing energy consumption. At the same time, it also provides a baffle plate adjustment device, which can adjust the position of the baffle plate according to different production needs, thereby adjusting the classification efficiency of the V-type classifier. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the V-type air classifier structure in this embodiment;

[0027] Figure 2 This is a schematic diagram of the outer structure of the adjustment section in this embodiment;

[0028] Figure 3 This is a schematic diagram of the internal structure of the adjustment unit in this embodiment;

[0029] Figure 4 This is a schematic diagram of the drive unit structure in this embodiment;

[0030] Figure 5 This is a particle size distribution diagram of the raw material from the V-type classifier.

[0031] Figure 6 Comparison chart of on-site measured efficiency of equipment with and without baffles;

[0032] Figure 7 This is a flowchart of the adjustment method in this embodiment;

[0033] Figure 8 This is a schematic diagram of the adjusted baffle plate position in Example 1.

[0034] In the diagram: 1-Air inlet, 2-Feeding outlet, 3-Coarse material collection outlet, 4-Dispersing plate, 5-Grading plate, 6-Fine material collection outlet, 7-Motor, 8-Main drive rod, 9-Driven gear, 10-Screw, 11-Guide rail, 12-Slider, 13-Telescopic cylinder, 14-Baffle plate, 15-Sealing plate, 16-Rotating shaft. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-8 In this embodiment of the invention, an adjustable V-shaped classifier includes a V-shaped shell. The top two ends of the shell are respectively provided with an air inlet 1 and a fine material collection port 6, and the bottom of the shell is provided with a coarse material collection port 2. The shell is provided with a dispersing plate 4 and a grading plate 5. The shell includes an air inlet cylinder and an air outlet cylinder. The air inlet cylinder and the air outlet cylinder are inclinedly connected to form a V-shaped structure. The upper end of the shell is provided with a discharge port 2 near the air inlet 1. The dispersing plate 4 is located below the discharge port 2. There are multiple dispersing plates 4 and multiple grading plates 5. The dispersing plates 4 and grading plates 5 are arranged at inclinations to each other.

[0037] An adjustment part is movably arranged on the inner wall of the housing near the grading plate 5. The adjustment part includes a baffle plate 14, which is movably connected to the inner wall of the housing. In this embodiment, the baffle plate 14 is slidably connected to the inner wall of the housing along the airflow direction, and rotatably connected to the inner wall of the housing along the sliding direction. A sliding groove is provided on the housing, which is arranged along the height direction of the housing. A slider 12 is slidably connected in the sliding groove. The slider 12 is connected to the sealing plate 15. The baffle plate 14 rotates up and down with the sealing plate 15 and the slider 12 via a rotating shaft 16. The lower end of the slider 12 is connected to a telescopic cylinder 13 for driving the baffle plate 14 to rotate. The piston end of the telescopic cylinder 13 is rotatably connected to the baffle plate 14. The outer wall of the housing is provided with a guide rail 11, and the slider 12 is slidably connected to the guide rail 11. The bottom plate of the housing is provided with a driving part for driving the slider 12 to slide on the guide rail 11. The driving part includes a lead screw 10 threadedly connected to the slider 12. The bottom plate of the housing is provided with a motor 7. The transmission shaft of the motor 7 is poweredly connected to a main transmission rod 8. The rear end of the main transmission rod 8 has a transmission gear, as shown in the attached instruction manual. Figure 4 As shown, the transmission gear on the main transmission rod 8, which is connected to the output shaft of the motor 7, is connected to the bottom of the lead screw 10, and the driven gear 9 is fixedly connected to the lead screw 10. The driven gear 9 is fixedly connected to the lead screw 10, so that the motor can drive the main transmission rod 8 to rotate, the main transmission rod 8 drives the driven gear 9 to rotate, and the driven gear 9 drives the lead screw 10 to rotate.

[0038] Multiple sliders 12 are provided, and each slider 12 has a baffle plate 14 rotatably connected to its inner side. A sealing plate 15 is arranged on the sliding groove. The sealing plate is larger than the groove, ensuring that the sealing plate can cover the groove no matter how the slider moves, thus initially achieving a seal for the powder particles. Then, a rubber bellows with the same shape as the elongated groove is installed on the shell. The bellows should be able to expand and contract by at least 50% of its length to achieve a complete gas seal.

[0039] An adjustable V-type air classifier adjustment method defines materials with a diameter less than or equal to b as fine materials and materials with a diameter greater than b as coarse materials, and improves the classification efficiency.

[0040] In this embodiment, the hierarchical efficiency is first defined:

[0041]

[0042] As per the instruction manual Figure 5 , 6As shown, the flow velocity of the V-type air classifier gradually increases from right to left at the outlet. Influenced by the flow field, the particles can be divided into two regions: an escape zone with a particle size less than 80 μm and an escape zone with a particle size of 200-600 μm. The goal of using a V-type air classifier is to collect as many raw material particles smaller than 80 μm as possible at the finer discharge outlet, while reducing the number of raw material particles larger than 200 μm. Higher classification efficiency for raw material particles smaller than 80 μm and lower classification efficiency for particles larger than 200 μm indicate higher classification accuracy of the V-type air classifier.

[0043] Therefore, a baffle plate was added to the outlet sidewall to block the airflow in the 200-600µm escape zone, thus achieving particle screening within this size range. Field measurements showed that the V-type classifier with the added baffle plate can effectively reduce the classification efficiency of medium and coarse particles (200-600µm) by approximately 50% while maintaining the same fine particle classification efficiency, achieving precise particle screening. Simultaneously, the overall pressure drop of the V-type classifier remained essentially unchanged.

[0044] The adjustment thresholds include a coarse adjustment threshold m and a fine adjustment threshold n. In this embodiment, the coarse adjustment diameter range is 200-400μm, the coarse adjustment threshold is 20%, and the fine adjustment threshold is 10%. The adjustment method includes the following steps:

[0045] Step 1: Obtain the classification efficiency η of coarse material with a diameter greater than b at the fine material collection port 6;

[0046] In step 1: the experimental V-type classifier cannot directly obtain the classification efficiency η of coarse materials with a particle size greater than b under different operating conditions through actual measurement and other means. According to the definition formula of classification efficiency η, this invention uses computational fluid dynamics software to realize the real-time and accurate calculation of the classification efficiency of coarse materials with a particle size greater than b when the baffle plate 14 is at a certain position. Step 2: compare the classification efficiency η obtained in step 1 with the adjustment threshold, then adjust the angle of the baffle plate 14 through the adjustment unit, and repeat step 1; if it is less than the classification threshold, then proceed to step 3;

[0047] Step 2 includes the following steps:

[0048] Step 2.1: Determine whether the graded efficiency η obtained in Step 1 is greater than the coarse adjustment threshold m. If it is greater than the coarse adjustment threshold m, then perform coarse adjustment by adjusting the height of the baffle plate 14, and then execute Step 1; if it is less than the coarse adjustment threshold m, then execute Step 2.2.

[0049] Step 2.2: Determine whether the graded efficiency η obtained in Step 1 is greater than the fine-tuning threshold n. If it is greater than the fine-tuning threshold n, fine-tune by adjusting the angle of the baffle plate 14, and then execute Step 1; if it is less than the fine-tuning threshold n, then execute Step 3.

[0050] Step 3: Adjustment complete.

[0051] Example 1

[0052] For a density of 2786 kg / m³ 3 d 50 For raw material particles of 560µm, a 2500t / d V-type classifier was used for classification, controlling the classification efficiency of particles with a diameter of 300µm to below 15%. The specific implementation steps are as follows:

[0053] (1) Without any adjustment to the baffle plate, the V-type classifier was used directly, and the classification efficiency for particles with a diameter of 300 μm was 35.76%.

[0054] (2) Gradually adjust the height of the baffle plate. When the height of the baffle plate is 4700mm from the top outlet of the classifier, the V-type classifier can achieve a classification efficiency of 18.70% for particles with a diameter of 300µm. At the same time, the classification efficiency for particles with a diameter of less than 100µm is 98.22%.

[0055] (3) Based on (1), rotating the baffle plate clockwise by 7° can reduce the particle classification efficiency of 300 μm particles to 11.57%. At the same time, the particle classification efficiency of particles smaller than 100 μm is 97.3%.

[0056] As per the instruction manual Figure 8 The adjusted baffle plate is 4700mm away from the top outlet of the air classifier, and the baffle plate angle is 7°.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable V-shaped air classifier, comprising a V-shaped housing, wherein an air inlet (1) and a fine material collection inlet (6) are respectively provided at both ends of the top of the housing, and a coarse material collection inlet (3) is provided at the bottom of the housing, characterized in that, The housing is provided with a dispersing plate (4) and a grading plate (5), and an adjustment part is movably arranged on the inner wall of the housing near the grading plate (5); The adjustment part includes a baffle plate (14), which is movably connected to the inner wall of the housing, and is slidably connected to the inner wall of the housing along the airflow direction, and is rotatably connected to the inner wall of the housing along the sliding direction; The housing is provided with a sliding groove, which is arranged along the height direction of the housing. A slider (12) is slidably connected in the sliding groove. The slider (12) is connected to the sealing plate (15). The flow baffle (14) is rotatably connected to the sealing plate (15) through a rotating shaft (16). The lower end of the slider (12) is connected to a telescopic cylinder (13) for driving the baffle plate (14) to rotate, and the piston end of the telescopic cylinder (13) is rotatably connected to the baffle plate (14). The outer wall of the housing is provided with a guide rail (11), the slider (12) is slidably connected to the guide rail (11), the bottom plate of the housing is provided with a driving part for driving the slider (12) to slide on the guide rail (11), the driving part includes a lead screw (10) threadedly connected to the slider (12), the bottom plate of the housing is provided with a motor (7), the transmission shaft of the motor (7) is poweredly connected to a main transmission rod (8), the main transmission rod (8) is provided with transmission teeth, the bottom of the lead screw (10) is fixedly connected with a driven gear (9), the driven gear (9) meshes with the transmission teeth on the main transmission rod (8).

2. The adjustable V-type air classifier according to claim 1, characterized in that, The housing includes an air inlet cylinder and an air outlet cylinder. The air inlet cylinder and the air outlet cylinder are connected at an incline to form a V-shaped structure. A discharge port (2) is provided on the upper end of the housing near the air outlet (1). The dispersing plate (4) is located below the discharge port (2).

3. An adjustable V-type air classifier according to claim 1, characterized in that, Multiple dispersing plates (4) and multiple grading plates (5) are provided, and the dispersing plates (4) and grading plates (5) are arranged at an incline to each other.

4. An adjustable V-type air classifier according to claim 1, characterized in that, The slider (12) is provided in multiple ways, and each slider (12) is rotatably connected to a baffle plate (14) on its inner side. The slider (12) is connected to a sealing plate (15).

5. An adjustable V-type classifier adjustment method for use in any one of claims 1-4, characterized in that, Using the adjustable V-type classifier according to any one of claims 1-4, materials with a diameter less than or equal to b are defined as fine materials, and materials with a diameter greater than b are defined as coarse materials. The adjustment method includes the following steps: Step 1: Obtain the classification efficiency η of coarse material with a diameter greater than b at the fine material collection port (6); Step 2: Compare the graded efficiency η obtained in Step 1 with the adjustment threshold, then adjust the angle of the baffle plate (14) through the adjustment unit and repeat Step 1; if it is less than the graded threshold, then execute Step 3. Step 3: Adjustment complete.

6. The adjustment method for an adjustable V-type air classifier according to claim 5, characterized in that, The graded efficiency The adjustment thresholds include a coarse adjustment threshold m and a fine adjustment threshold n. Step 2 includes the following steps: Step 2.1: Determine whether the graded efficiency η obtained in Step 1 is greater than the coarse adjustment threshold m. If it is greater than the coarse adjustment threshold m, then perform coarse adjustment by adjusting the height of the baffle plate 14, and then execute Step 1; if it is less than the coarse adjustment threshold m, then execute Step 2.

2. Step 2.2: Determine whether the graded efficiency η obtained in Step 1 is greater than the fine-tuning threshold n. If it is greater than the fine-tuning threshold n, fine-tune by adjusting the angle of the baffle plate 14, and then execute Step 1. If it is less than the fine-tuning threshold n, then execute Step 3.

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