Air flow grading device with pre-dispersion function

Abstract

The utility model relates to the related technical field of airflow classification, in particular to an airflow classification device with a pre-dispersion function, which comprises a classification chamber assembly, and a pre-dispersion assembly is arranged at the top of the classification chamber assembly. Through rotation adjustment of the movable ring and the gear, continuous and accurate change of the blade angle can be achieved, then the spiral vortex intensity formed by airflow is dynamically controlled, the carrying and separating capacity of the airflow to materials is directly influenced by the change of the spiral vortex intensity, when the vortex is enhanced, suspension and conveying of fine particles can be enhanced, and the spiral vortex type fine powder grading device is suitable for fine powder grading. When the vortex is weakened, coarse particles are easier to settle, so that accurate separation of coarse and fine materials is facilitated, the materials are diffused outwards under the action of centrifugal force after falling into the center of the throwing disc, the throwing disc generates shearing force on the caked materials when rotating, the particles are further scattered, an annular airflow nozzle is introduced below the throwing disc, dispersion is assisted through tangential airflow, and secondary aggregation of the materials is prevented; and mechanical centrifugation and airflow-assisted dual dispersion are utilized.

Description

Technical Field

[0001] This utility model relates to the technical field of airflow classification, and in particular to an airflow classification device with pre-dispersion. Background Technology

[0002] An air classifier is a device that uses the centrifugal force generated by the classifier impeller and the centripetal force generated by the airflow during the feeding process to collect fine particles that meet the particle size requirements through the gap between the classifier impeller blades, while coarse particles are thrown out of the classifier impeller and discharged uniformly. It is a device for classifying powder materials and is widely used in various fields. Therefore, an air classifier with pre-dispersion is particularly needed.

[0003] A feeding device for an air classifier, authorized by announcement number CN220941874U, includes a classifier box and a hopper. A discharge pipe is fixedly connected to the bottom of the hopper, and a conveying mechanism is fixedly connected to the bottom of the discharge pipe. The conveying mechanism is perpendicular to the classifier box. The hopper is connected to the classifier box via the discharge pipe and the conveying mechanism. A dispersing component is fixedly connected to the end of the conveying mechanism near the inside of the classifier box. This invention utilizes the conveying mechanism to spirally transport the material inside the hopper to the inside of the classifier box. The uniformly operating conveying mechanism ensures that the amount of material transported within the same time period is also the same, thereby guaranteeing uniform feeding and improving the classification effect. Simultaneously, the dispersing component further disperses the material transported to the classifier box by the conveying mechanism, preventing material from concentrating upon entering the classifier box, further improving the material classification effect.

[0004] However, the aforementioned air classifier feeding device cannot dynamically control the airflow intensity, resulting in classification accuracy being limited to fixed working conditions, and the dispersion method is singular, which is insufficient for highly viscous or highly agglomerated materials.

[0005] To address the aforementioned problems, a pre-dispersion airflow classification device is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a pre-dispersed airflow classification device to solve the problems of existing pre-dispersed airflow classification devices mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an airflow classification device with pre-dispersion, comprising a classification chamber assembly, wherein a pre-dispersion component is disposed on the top of the classification chamber assembly;

[0008] The grading chamber assembly includes a grading chamber body, an annular top plate on the inner wall of the grading chamber body, an annular bottom plate below the annular top plate, a movable ring on the inner wall of the annular bottom plate, an annular cover plate on the top wall of the annular bottom plate, and the annular cover plate is located on top of the movable ring. A blade is provided between the annular top plate and the annular cover plate, and multiple sets of blades are provided with the center of the annular top plate as the axis.

[0009] Preferably, the grading chamber assembly further includes a grading hopper welded to the bottom of the annular base plate, two sets of mounting blocks are provided on the outer side wall of the movable ring, a shaft is provided through the inner wall of the blade, a push rod is rotatably connected between the mounting blocks, and a gear is provided at the bottom of the shaft.

[0010] Preferably, the pre-dispersion assembly includes a pre-dispersion chamber disposed on the top of the classification chamber body, a drive motor installed on the top of the pre-dispersion chamber, a sling plate disposed on the inner wall of the pre-dispersion chamber and connected to the output shaft of the drive motor, an annular tube disposed on the inner wall of the pre-dispersion chamber below the sling plate, five sets of airflow nozzles disposed on the inner side of the annular tube, and an air pipe body disposed on one side of the annular tube and passing through the side wall of the pre-dispersion chamber.

[0011] Preferably, an air inlet pipe is installed on one side of the classification chamber body, and the exhaust end of the air inlet pipe extends to the inner wall of the classification hopper; a fine particle discharge port is installed on the other side of the classification chamber body, and the feed end of the fine particle discharge port extends to the inner wall of the classification hopper; a coarse particle discharge port is installed at the bottom of the classification chamber body; and a feed inlet is provided on one side of the pre-dispersion chamber.

[0012] Preferably, the top of the shaft is rotatably connected to the annular top plate, and the bottom end of the shaft passes through the annular cover plate and is connected to the gear. The push rods pass through the annular bottom plate and the grading chamber body, respectively.

[0013] Preferably, the inner side of the movable ring is toothed, and the inner wall of the annular base plate is toothed on the side opposite to the toothed surface of the movable ring. The movable ring is disposed on the inner wall of the annular base plate, and gears mesh in the space formed between the toothed surface of the movable ring and the toothed surface of the annular base plate.

[0014] Preferably, the slinger is located below the feed inlet, and the airflow nozzle opening direction is tangentially inclined at 30 degrees toward the grading zone.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By adjusting the rotation of the movable ring and gear, the blade angle can be continuously and precisely changed, thereby dynamically controlling the intensity of the spiral vortex formed by the airflow. The change in the intensity of the spiral vortex directly affects the airflow's ability to carry and separate materials. When the vortex is enhanced, the suspension and conveying of fine particles can be strengthened, which is suitable for fine powder classification. When the vortex is weakened, coarse particles are easier to settle, thus facilitating the precise separation of coarse and fine materials.

[0017] 2. After the material falls to the center of the sling pan, it diffuses outward under the action of centrifugal force. When the sling pan rotates, it generates shear force on the agglomerated material, further breaking up the particles. A ring-shaped airflow nozzle is introduced below the sling pan to assist in dispersion through tangential airflow, preventing the material from agglomerating again. The material is dispersed by a combination of mechanical centrifugation and airflow assistance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0020] Figure 3 This is a cross-sectional structural diagram of the pre-dispersion component of this utility model;

[0021] Figure 4 This is a cross-sectional structural diagram of the graded chamber component of this utility model;

[0022] Figure 5 This is a schematic diagram showing the disassembled structure of the graded chamber component of this utility model.

[0023] In the diagram: 1. Classification chamber assembly; 101. Classification chamber body; 102. Annular top plate; 103. Annular bottom plate; 104. Movable ring; 105. Annular cover plate; 106. Blade; 107. Classification hopper; 108. Mounting block; 109. Shaft column; 110. Push rod; 111. Gear; 2. Pre-dispersion assembly; 201. Pre-dispersion chamber; 202. Drive motor; 203. Throwing disc; 204. Annular pipe; 205. Airflow nozzle; 206. Air pipe body; 3. Air inlet pipe; 4. Fine particle discharge port; 5. Coarse particle discharge port; 6. Feed inlet. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] Example

[0026] like Figure 4 , 5As shown, the grading chamber assembly 1 includes a grading chamber body 101. An annular top plate 102 is provided on the inner wall of the grading chamber body 101. An annular bottom plate 103 is provided below the annular top plate 102. A movable ring 104 is provided on the inner wall of the annular bottom plate 103. An annular cover plate 105 is provided on the top wall of the annular bottom plate 103 and is located on top of the movable ring 104. A blade 106 is provided between the annular top plate 102 and the annular cover plate 105. Multiple sets of blades 106 are provided with the center of the annular top plate 102 as the axis. The grading chamber assembly 1 also includes a grading hopper 107 welded to the bottom of the annular bottom plate 103. Two sets of mounting blocks 108 are provided on the outer wall of the movable ring 104. A shaft 109 passes through the inner wall of the blades 106. A push rod 110 is rotatably connected between the mounting blocks 108. A gear 111 is provided at the bottom of the shaft 109.

[0027] It should be noted that in this embodiment, the air inlet pipe 3 is connected to the external fan pipe and introduces an upward main airflow into the classifying hopper 107. The airflow carries the pre-dispersed particles upward and enters the space between the annular top plate 102 and the annular cover plate 105. The blades 106 between the annular top plate 102 and the annular cover plate 105 are fixed on the shaft column 109. When the airflow passes through the blades 106, it is guided to form a high-speed rotating centrifugal airflow field. The particles are subjected to the combined action of centrifugal force and airflow drag in the rotating airflow. The coarse particles have a large mass and the centrifugal force is greater than the airflow drag, so they move towards the outside of the classifying hopper. After hitting the inner wall, they fall down along the wall to the coarse particle discharge port 5. The fine particles have a small mass and the drag is greater than the centrifugal force, so they move towards the center with the airflow and enter the fine particle discharge port 4.

[0028] The inner side of the movable ring 104 and the inner wall of the annular base plate 103 are both toothed, and they are meshed by a gear 111. Since the push rod 110 is rotatably connected to the movable ring 104 through the mounting block 108, the external electric push rod drives the push rod 110 to rotate slightly, which in turn drives the gear 111 to rotate slightly, thereby pushing the movable ring 104 to rotate slightly along the inner wall of the annular base plate 103. The shaft 109 is vertically inserted through the middle of each blade 106. The blade 106 can rotate around the shaft 109 as the axis. The top of the shaft 109 is rotatably connected to the annular top plate 102 through a bearing, and the bottom end passes through the annular cover plate 105 and is welded and fixed to the gear 111. When the gear 111 is driven by the movable ring 104 to rotate slightly, the shaft 109 rotates synchronously. Since the shaft 109 is inserted through the middle of the blade 106, the blade 106 will rotate slightly around the axis of the shaft 109, thereby changing the angle between the blade 106 and the airflow direction.

[0029] Furthermore, a shaft hole is opened in the middle of the blade 106. The inner diameter of the shaft hole and the outer diameter of the shaft post 109 are transitionally fitted, and circumferential fixation is achieved through a keyway and a flat key to ensure that the blade 106 rotates synchronously with the shaft post 109 without relative slippage. Thrust washers are provided at the contact points between the upper and lower surfaces of the blade 106 and the shaft post 109 to prevent the blade 106 from axially moving and to ensure the stability of angle adjustment. All blades 106 are connected in series as a whole through the shaft post 109. When the shaft post 109 rotates, each blade 106 rotates synchronously by the same angle to avoid turbulence in the eddy current field caused by inconsistent angles of the blades 106.

[0030] like Figure 1-3 As shown, the system includes a classification chamber assembly 1, a pre-dispersion assembly 2 on top of the classification chamber assembly 1, an air inlet pipe 3 on one side of the classification chamber body 101 with its exhaust end extending to the inner wall of the classification hopper 107, a fine particle discharge port 4 on the other side of the classification chamber body 101 with its feed end extending to the inner wall of the classification hopper 107, a coarse particle discharge port 5 at the bottom of the classification chamber body 101, and a feed inlet 6 on one side of the pre-dispersion chamber 201. The pre-dispersion assembly 2 includes components for the classification chamber assembly 101. A pre-dispersion chamber 201 is provided on the top of the chamber body 101. A drive motor 202 is installed on the top of the pre-dispersion chamber 201. A sling plate 203 is provided on the inner wall of the pre-dispersion chamber 201, and the sling plate 203 is connected to the output shaft of the drive motor 202. An annular tube 204 is provided on the inner wall of the pre-dispersion chamber 201 below the sling plate 203. Five sets of airflow nozzles 205 are installed on the inner side of the annular tube 204. An air pipe body 206 is installed on one side of the annular tube 204, and the air pipe body 206 passes through the side wall of the pre-dispersion chamber 201.

[0031] It should be noted that, firstly, the material enters the pre-dispersion chamber 201 through the feed port 6 on one side of the pre-dispersion chamber 201 and falls directly onto the top of the sling plate 203. The drive motor 202 drives the sling plate 203 to rotate at high speed. Under the action of centrifugal force, the material is thrown against the inner wall of the pre-dispersion chamber 201, and is initially crushed and dispersed into smaller particle clusters. The external air compressor delivers high-pressure airflow to the annular pipe 204 through the air pipe body 206. The airflow is ejected through five sets of airflow nozzles 205 with a tangential 30-degree inclination. The inclined airflow forms a rotating air curtain in the pre-dispersion chamber 201 and collides with the particle clusters thrown out by the sling plate 203, further breaking the particle clusters into single particles to avoid agglomeration. The dispersed particles are mixed with the airflow and enter the classification chamber body 1.

[0032] Working principle of this utility model:

[0033] Refer to the instruction manual appendix Figure 1-5First, the material enters the pre-dispersion chamber 201 through the feed port 6 on one side of the pre-dispersion chamber 201 and falls directly onto the top of the throwing disc 203. The drive motor 202 drives the throwing disc 203 to rotate at high speed. Under the action of centrifugal force, the material is thrown against the inner wall of the pre-dispersion chamber 201, and is initially crushed and dispersed into smaller particle clusters. The external air compressor delivers high-pressure airflow to the annular pipe 204 through the air pipe body 206. The airflow is ejected through five sets of airflow nozzles 205 with a tangential 30-degree inclination. The inclined airflow forms a rotating air curtain in the pre-dispersion chamber 201 and collides with the particle clusters thrown out by the throwing disc 203, further breaking the particle clusters into single particles to avoid agglomeration. The dispersed particles are mixed with the airflow and enter the classification chamber body 1.

[0034] The air inlet pipe 3 is connected to the external fan pipe and introduces an upward main airflow into the classifying hopper 107. The airflow carries the pre-dispersed particles upward and enters the space between the annular top plate 102 and the annular cover plate 105. The blades 106 between the annular top plate 102 and the annular cover plate 105 are fixed on the shaft column 109. When the airflow passes through the blades 106, it is guided to form a high-speed rotating centrifugal airflow field. The particles are subjected to the combined action of centrifugal force and airflow drag in the rotating airflow. The coarse particles have a large mass and the centrifugal force is greater than the airflow drag, so they move towards the outside of the classifying hopper. After hitting the inner wall, they fall down along the wall to the coarse particle discharge port 5. The fine particles have a small mass and the drag force is greater than the centrifugal force, so they move towards the center with the airflow and enter the fine particle discharge port 4.

[0035] When the blade 106 angle is adjusted, the external electric actuator drives the push rod 110 to rotate slightly, causing the gear 111 to rotate slightly, which in turn pushes the movable ring 104 to rotate slightly along the inner wall of the annular base plate 103. The shaft 109 is vertically inserted through the middle of each blade 106. The blade 106 can rotate around the shaft 109 as its axis. The top of the shaft 109 is rotatably connected to the annular top plate 102 through a bearing, and the bottom end passes through the annular cover plate 105 and is welded and fixed to the gear 111. When the gear 111 is driven by the movable ring 104 to rotate slightly, the shaft 109 rotates synchronously. Since the shaft 109 is inserted through the middle of the blade 106, the blade 106 will rotate slightly around the axis of the shaft 109, thereby changing the angle between the blade 106 and the airflow direction.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-dispersed airflow classification device, comprising a classification chamber assembly (1), characterized in that: A pre-dispersion component (2) is provided on the top of the grading chamber component (1); The grading chamber assembly (1) includes a grading chamber body (101), an annular top plate (102) is provided on the inner wall of the grading chamber body (101), an annular bottom plate (103) is provided below the annular top plate (102), a movable ring (104) is provided on the inner wall of the annular bottom plate (103), an annular cover plate (105) is provided on the top wall of the annular bottom plate (103), and the annular cover plate (105) is located on top of the movable ring (104). A blade (106) is provided between the annular top plate (102) and the annular cover plate (105), and multiple sets of blades (106) are provided with the center of the annular top plate (102) as the axis.

2. The airflow classification device with pre-dispersion according to claim 1, characterized in that: The grading chamber assembly (1) also includes a grading hopper (107) welded to the bottom of the annular base plate (103), two sets of mounting blocks (108) are provided on the outer side wall of the movable ring (104), a shaft column (109) is provided through the inner wall of the blade (106), a push rod (110) is rotatably connected between the mounting blocks (108), and a gear (111) is provided at the bottom of the shaft column (109).

3. The airflow classification device with pre-dispersion according to claim 1, characterized in that: The pre-dispersion assembly (2) includes a pre-dispersion chamber (201) disposed on the top of the grading chamber body (101). A drive motor (202) is installed on the top of the pre-dispersion chamber (201). A sling plate (203) is provided on the inner wall of the pre-dispersion chamber (201), and the sling plate (203) is connected to the output shaft of the drive motor (202). An annular tube (204) is provided on the inner wall of the pre-dispersion chamber (201) below the sling plate (203). Five sets of airflow nozzles (205) are installed on the inner side of the annular tube (204). An air pipe body (206) is installed on one side of the annular tube (204), and the air pipe body (206) passes through the side wall of the pre-dispersion chamber (201).

4. The airflow classification device with pre-dispersion according to claim 3, characterized in that: An air inlet pipe (3) is installed on one side of the grading chamber body (101), and the exhaust end of the air inlet pipe (3) extends to the inner wall of the grading hopper (107). A fine particle discharge port (4) is installed on the other side of the grading chamber body (101), and the feed end of the fine particle discharge port (4) extends to the inner wall of the grading hopper (107). A coarse particle discharge port (5) is installed at the bottom of the grading chamber body (101). A feed inlet (6) is provided on one side of the pre-dispersion chamber (201).

5. A pre-dispersed airflow classification device according to claim 2, characterized in that: The top of the shaft (109) is rotatably connected to the annular top plate (102), and the bottom end of the shaft (109) passes through the annular cover plate (105) and is connected to the gear (111). The push rod (110) passes through the annular bottom plate (103) and the grading chamber body (101) respectively.

6. The airflow classification device with pre-dispersion according to claim 1, characterized in that: The inner side of the movable ring (104) is toothed, and the inner wall of the annular base plate (103) is toothed on the side opposite to the toothed surface of the movable ring (104). The movable ring (104) is located on the inner wall of the annular base plate (103), and a gear (111) meshes in the space formed between the toothed surface of the movable ring (104) and the toothed surface of the annular base plate (103).

7. A pre-dispersed airflow classification device according to claim 3, characterized in that: The swivel disc (203) is located below the feed inlet (6), and the airflow nozzle (205) has an opening direction that is tangentially inclined at 30 degrees toward the grading zone.

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