CN101947514A - Coarse fraction powder concentrator - Google Patents

Abstract

The invention relates to a coarse fraction powder concentrator which comprises an engine base, a bearing block, a transmission wheel, a hollow spindle, a spreading disk, a large fan blade, an inner shell and an outer shell, wherein the bearing block is arranged on an engine cover; the hollow spindle is arranged on the bearing block through a bearing, and a material inlet is arranged above the hollow spindle; the transmission wheel, the spreading disk and the large fan blade are assembled on the hollow spindle to form a rotor component capable of rotating; the outer shell consists of an upper outer shell and a lower outer shell; the engine base is arranged outside the outer shell; the lower part of the lower outer shell is provided with a fine powder outlet; the inner shell is arranged in an inner cavity formed by the outer shell and consists of an upper inner shell and a lower inner shell; the lower part of the lower inner shell is provided with a coarse powder outlet; and air return blades are arranged between the upper inner shell and the lower inner shell. The invention has the advantages of simple structure, high efficiency, large treatment capacity, long service life and no need of an external fan.

Description

Coarse class powder separator

technical field

The invention relates to a dry separation device for powdery materials, in particular to a dry separation device for coarse-grained powdery materials used in industries such as non-metallic ore and new materials.

Background technique

Commonly used dry powder separators in industry mainly include centrifugal type, cyclone type, rotor type, etc. Their common feature is to use wind force to blow the material from bottom to top, and when the material is blown to the grading rotor or small wind blade that acts as a fence ,Coarse materials fall into the coarse powder area due to the gravity, centrifugal force, etc., which make the downward force greater than the upward air force, and the fine powder continues to enter the fine powder area. Because these classifiers adjust the fineness of the finished powder by changing the number of small fan blades and the rotating speed of the classifying impeller, they must have a large classifying height to separate coarse and fine powder.

Theoretically speaking, general powder classifiers rely on wind force to overcome gravity to lift materials and classify and classify them. Since the wind-receiving area of materials is proportional to the square of the particle size, and the weight is proportional to the cube of the particle size of the materials, it is large Granular materials and materials with large specific gravity are not easy to be lifted, sorted and classified. If the material separation particle size is large, as the particle size increases, the increase in gravity is much greater than the increase in wind force, and it is difficult for the upward airflow to lift the coarser material to a greater height to the grading rotor or small wind blade for grading. , so these ordinary classifiers are only suitable for the classification of finer materials (such as -80 mesh, that is, the particle size is less than 0.175mm).

CN100522393C discloses a "Coarse Particle Separator", which can realize the purpose of coarse particle separation, but because an external fan is required to lift the materials, the classification system becomes more complicated.

Contents of the invention

The purpose of the present invention is to provide a powder separator with high efficiency, strong processing capacity and long service life, which is suitable for grading coarse-grained materials or materials with high specific gravity without external fans.

The purpose of the present invention is achieved through the following technical solutions: it is a vertical structure, including machine base, bearing seat, transmission wheel, hollow main shaft, material spreading plate, big fan blade, inner shell, outer shell, and the bearing seat is installed On the machine cover; the hollow main shaft is installed on the bearing seat through bearings, and the feeding port is set above the hollow main shaft; the transmission wheel, material spreading disc, and large wind blade are assembled on the hollow main shaft to form a rotatable rotor component The outer shell is composed of two parts, the upper outer shell and the lower outer shell. The machine base is located outside the outer shell for the installation of the machine. In the formed inner cavity, the inner shell is composed of two parts, the upper inner shell and the lower inner shell. The lower part of the lower inner shell is provided with a coarse powder outlet, and the upper inner shell and the lower inner shell are provided with return air vanes. .

The upper part of the upper inner casing is provided with a horizontal annular retaining ring fixedly connected with it, which is used to prevent powder and air flow from passing through the joint surface.

When working, the rotor part rotates through the connection between its transmission wheel and the driving device, and the wind (air flow) generated by the rotation of the large wind blade passes from top to bottom through the channel between the upper inner casing and the upper outer casing, and then enters the inner casing through the return air blade. The inside of the shell flows from bottom to top, forming a circular flow. After entering the material from the feed port, the material falls on the spreading plate through the hollow main shaft, and is scattered by the spreading plate to the top of the spreading plate, the interior of the upper inner shell and In the central chamber classification area formed above, the coarse material falls due to the gravity, and is discharged from the coarse powder outlet at the lower part of the lower inner shell, while the fine powder is driven by the airflow and enters through the upper part of the inner shell. In the fine powder area formed by the cavity between the shell and the outer shell, due to the cyclone effect, it falls along the inner wall of the upper shell, and finally is discharged from the fine powder outlet at the lower part of the lower shell. The particle size selection can be adjusted by adjusting the number, size, shape and installation position of the large fan blades, the structure and size of the spreading plate, the rotor speed, or adding a pass-through annular powder selection blade or screen.

Compared with the existing dry powder separator, the present invention saves the rotating grading rotor or small fan blades, reduces the distance of the material from the grading area, so that the material with larger particles can be lifted to the grading area, thereby achieving The purpose of classifying materials with coarser particle size. Compared with the centrifugal powder classifier, the structure is simpler, the material is fed from the center, the distribution is more uniform, and the efficiency is higher.

It should be pointed out that the present invention is not suitable for the classification of fine-grained materials (such as the split particle size is less than 0.1mm), because the powder selection space is small, the fine-grained powder selection and segmentation accuracy is low, and the classification of fine-grained materials It is suitable to adopt the dry powder separator described in the background art.

When adopting the technical solution of the present invention to classify coarse-grained materials, if the particle size distribution of the fine powder is strictly required, a pass-through annular powder selection blade or screen can be set between the opening above the inner casing and the upper machine cover to prevent coarse powder The particle size material enters the fine powder area.

In order to improve the classification efficiency, a screen can also be arranged on the conical surface of the lower inner casing.

The invention has the advantages of simple structure, high efficiency, strong processing capacity, long service life and no need for external fans.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present invention;

Fig. 2 is the structural representation of embodiment 2 of the present invention;

Fig. 3 is a schematic structural diagram of Embodiment 3 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

Example 1

Referring to Fig. 1, this embodiment includes a machine base 803, a bearing seat 2, a transmission wheel 1, a hollow main shaft 3, a material spreading disc 5, a large fan blade 6, an inner shell, and an outer shell, and the bearing seat 2 is installed on the machine cover 9 above; the hollow main shaft 3 is installed on the bearing seat 2 through bearings, and the feeding port is set above the hollow main shaft; The rotor part; the outer shell is composed of two parts, the upper shell 801 and the lower shell 802, the frame 803 is arranged outside the shell for installation of the machine, and the bottom of the lower shell 802 is provided with a fine powder outlet 804; The inner casing is placed in the inner cavity formed by the outer casing. The inner casing is composed of two parts: an upper inner casing 701 and a lower inner casing 702. The lower part of the lower inner casing 702 is provided with a coarse powder outlet 704. The upper inner casing A return air vane 703 is arranged between the body 701 and the lower inner casing 702 ; a horizontal annular retaining ring 705 is fixedly connected to the upper inner casing 701 .

When working, the transmission wheel 1 is connected with an external drive device (not shown in the figure), the transmission wheel 1 drives the rotor parts to rotate, and the wind (airflow) generated by the rotation of the large wind blade 6 passes through the upper inner casing 701 and the upper outer casing The passage between 801 is from top to bottom, and then enters the interior of the inner casing through the return air blade 703, and flows from bottom to top to form a circular flow (as shown by arrow A in the figure); the material B to be classified is taken from the inlet After the material port 4 enters, it falls on the material spreading plate 5 through the hollow main shaft 3, and spreads through the material spreading plate 5 to the center cavity classification area in the machine formed above the material spreading plate 5, inside and above the upper inner shell 701, and the coarse material Falling due to gravity, the coarse powder outlet 704 at the lower part of the lower inner casing 702 is discharged outside the machine, while the fine powder is driven by the airflow and enters the cavity formed by the inner casing and the outer casing through the upper part of the inner casing. In the fine powder area, due to the cyclone effect, it falls along the inner wall of the outer casing, and finally is discharged from the fine powder outlet 804 at the bottom of the lower outer casing 802 . The particle size selection can be adjusted by adjusting the number, size, shape and installation position of the large fan blades, the structure and size of the spreading plate, and the rotor speed.

Example 2

Referring to FIG. 2 , compared with Embodiment 1, this embodiment differs only in that a pass-through annular powder selection blade 10 is added between the opening above the upper inner casing 701 and the machine cover 9 . All the other are with embodiment 1. Only fine materials that meet the particle size requirements can pass through the annular powder selection blade 10 and enter the fine powder area to realize the second classification, which is beneficial to the strict control of the particle size of the fine powder. Simple structure and high classification efficiency.

Example 3

Referring to FIG. 3 , compared with Embodiment 1, this embodiment differs only in that a screen 11 is added between the upper inner casing 701 and the machine cover 9 . All the other are with embodiment 1. Only the fine powder materials that pass through the sieve holes of the screen 11 can enter the fine powder area, realizing the second classification, which is conducive to the strict control of the particle size of the fine powder.

The sieve 11 is different from the ordinary sieve in two points: one is that the material entering the sieve has been classified by the air flow, and the sieve only needs to block a small amount of coarser particles from entering the fine powder area, and does not need to be processed like an ordinary sieve. All materials; the second is that the materials entering the screen are suspended in the gas, which has high screening efficiency and is not easy to block the screen holes, unlike ordinary sieves that rely on gravity field to screen materials. Using the existing gas and powder passages in the structure to realize the second stage classification, the structure is simpler and the classification efficiency is higher.

Claims (5)

1. A coarse-grained powder separator, comprising a machine base, a bearing seat, a drive wheel, a hollow main shaft, a material spreading disc, a large fan blade, an inner shell, and an outer shell, and it is characterized in that the bearing seat is installed on the machine cover above; the hollow main shaft is installed on the bearing seat through bearings, and the feed inlet is set above the hollow main shaft; the transmission wheel, the spreading disc, and the large wind blade are assembled on the hollow main shaft to form a rotatable rotor part; The outer shell is composed of two parts, the upper outer shell and the lower outer shell. It is composed of two parts, the upper inner shell and the lower inner shell. The lower part of the lower inner shell is provided with a coarse powder outlet, and there is a return air blade between the upper inner shell and the lower inner shell. 2. The coarse-grain class powder separator according to claim 1, characterized in that, the upper part of the upper inner casing is provided with a horizontal annular retaining ring fixedly connected thereto. 3. The coarse-grained powder separator according to claim 1 or 2, characterized in that, a pass-through annular powder separator is arranged between the opening above the inner casing and the upper machine cover. 4. The coarse-grain class powder separator according to claim 1 or 2, characterized in that a screen is set between the opening above the inner casing and the upper machine cover. 5. The coarse-grain class powder separator according to claim 1 or 2, characterized in that a screen is arranged on the conical surface of the lower inner shell.

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