Automatic fine powder screening device

Abstract

The utility model relates to the field of powder product screening equipment, in particular to an automatic fine powder screening device which comprises a screening shell, a screen is arranged in the screening shell and divides the screening shell into a front area located on the upper portion and a rear area located on the lower portion, an air inlet assembly is arranged in the front area, and an air outlet assembly is arranged in the rear area. A separation assembly is arranged in the rear area part, and the side wall of the separation assembly communicates with a negative pressure air exhaust assembly. The fine powder screening device has the effects that fine powder can be accurately screened, and the influence of a medium assisting in screening on the fine powder is reduced.

Description

Technical Field

[0001] This application relates to the field of powder screening equipment, and in particular to an automatic screening device for fine powder. Background Technology

[0002] Screening is widely used in the mining, metallurgical, building materials, and chemical industries. It is a common and important method for separating and classifying solid particles. In industrial production and mineral analysis, it is often necessary to screen various granular materials to separate and classify them according to particle size.

[0003] In the mining and metallurgical industry, screening is frequently used in the grading and beneficiation of ores. By screening, ores can be separated according to different particle sizes, making subsequent beneficiation work more efficient and precise. In the building materials industry, screening is also required in the production of materials such as cement, sand, gravel, and concrete aggregates to ensure the quality of raw materials and the uniformity of particle size. In the chemical industry, screening granular chemical raw materials ensures the quality of raw materials and reaction efficiency during the production process.

[0004] A standard sieve typically consists of a series of screens with different mesh sizes. Based on the size and shape of the particles, vibration or mechanical motion causes the particles to be classified on the screens. Larger particles cannot pass through the screen mesh and are therefore screened down, while smaller particles pass through. This allows for the separation and classification of particles, resulting in particulate materials of different sizes.

[0005] Regarding the aforementioned technologies, the inventors believe that current sieving methods mainly include vibration separation using vibrating screens and manual separation using brushes, but these methods are extremely difficult for sieving fine powders larger than 200 mesh. In actual operation, washing with water on a standard sieve allows the water flow to separate the fine powder, leaving the coarser components. However, this method is susceptible to errors due to the dissolution of minerals in water. Utility Model Content

[0006] In order to accurately screen fine powders and reduce the impact of auxiliary screening media on fine powders, this application provides an automatic fine powder screening device.

[0007] This application provides an automatic screening device for fine powder materials, which adopts the following technical solution:

[0008] An automatic fine powder screening device includes a screening shell, inside which a screen is provided, dividing the screening shell into an upper front section and a lower rear section. An air inlet component is provided in the front section, and a separation component for collecting the fine powder filtered by the screen is provided in the rear section. A negative pressure suction component is connected to the side wall of the separation component.

[0009] By adopting the above technical solution, a negative pressure is created inside the system through the negative pressure extraction component, allowing external gas to enter the screen from the front section. This gas carries the fine powder inside the screen through the bottom of the screen. After being screened, the fine powder enters the separation component, where it separates the gas from the fine powder, thus achieving the function of collecting the fine powder. This method can accurately screen the fine powder and reduce the impact of auxiliary screening media on the fine powder.

[0010] Optionally, the screening shell includes a support plate, and the screen mesh is further provided with a screening bottom wall fixed to the inner wall of the screening shell. The screening bottom wall has screen holes, and screening side walls are fixedly connected to the periphery of the screening bottom wall. The top of the screening side wall is provided with a cover plate located above the screening bottom wall and covering the screening bottom wall. The screen mesh is installed on the support plate.

[0011] By adopting the above technical solution, the bottom wall of the screen is provided with screen holes, and different screens can be replaced according to different requirements. Then, the screen can be installed and fixed on the support plate to adapt to different needs.

[0012] Optionally, a vibrator is also fixedly connected to the inner wall of the screening shell, and the vibrator drives the screen to vibrate.

[0013] By adopting the above technical solution, the vibrator drives the screening shell and screen to vibrate, thereby reducing the clogging of the screen holes by the fine powder to be screened and improving the screening effect of the screen on the fine powder.

[0014] Optionally, the air intake assembly includes an air pipe disposed on the cover plate, with the air intake end of the air pipe located above the cover plate and the air outlet end of the air pipe extending into the screen.

[0015] By adopting the above technical solution, external gas is introduced into the screen through the gas pipe. The gas carries the fine powder for screening. By using gas screening as an auxiliary screening medium, the impact of the liquid in the water washing method on the powder is reduced.

[0016] Optionally, the air tube is rotatably connected to the cover plate, and the cover plate is provided with a drive assembly for driving the air tube to rotate.

[0017] By adopting the above technical solution, the air pipe is rotatably connected to the cover plate, and the air pipe is driven to rotate by the drive component. The air pipe increases the blowing area inside the screen, so that the fine powder inside the screen can form a fluidized state. Small powder particles pass through the screen with the air, while large particles remain inside the screen, thus improving the screening effect of the screen.

[0018] Optionally, the drive assembly includes a drive motor, a first gear is fixedly connected to the motor shaft of the drive motor, and a second gear is fixedly connected to the side wall of the air pipe, wherein the first gear meshes with the second gear.

[0019] By adopting the above technical solution, the motor shaft of the drive motor drives the first gear to rotate, the first gear drives the second gear that meshes with it to rotate, and then the second gear drives the air pipe to rotate, so that the diversion part located inside the screen can rotate and flow the fine powder inside the screen.

[0020] Optionally, the air pipe includes an air inlet, the top of which is located above the cover plate, the bottom of which extends into the screen, and a diversion section is fixedly connected to the bottom of the air inlet. The diversion section is provided with multiple air outlets, which are connected to the air inlet, and the airflow directions of the multiple air outlets are staggered.

[0021] By adopting the above technical solution, multiple air outlets are set inside the screen to increase the blowing of fine powder inside the screen, improve the movement efficiency of fine powder inside the screen, and thus improve the screening effect of fine powder.

[0022] Optionally, the separation assembly includes a cyclone separator, the inlet end of which is connected to the bottom end of the screen, a collector is provided at the bottom outlet end of the cyclone separator, and the top outlet end of the cyclone separator is connected to the negative pressure extraction assembly.

[0023] By adopting the above technical solution, the fine powder after screening enters the interior of the cyclone separator for centrifugal motion through the cyclone separator. The fine powder with larger mass is located on the inner wall of the cyclone separator, and the air is located at the center of the cyclone separator, thereby realizing the separation of fine powder and air. The separated fine powder falls into the interior of the collector, and the separated gas enters the interior of the negative pressure exhaust assembly.

[0024] Optionally, an air intake channel is provided at the top of the screening shell, and an air filter element is fixedly connected to the screening shell relative to the air intake channel, the air filter element being located on the front section.

[0025] By adopting the above technical solution, the outside world is connected to the inside of the screening shell through the set air intake channel. When the negative pressure air extraction component is activated, a negative pressure is formed inside the screening shell, which drives the outside gas into the screening shell. An air filter element is set at the position of the air intake channel to filter the incoming air and reduce the impact of impurities on screening.

[0026] Optionally, the negative pressure extraction assembly includes a negative pressure pipe, one end of which is connected to the outlet of the cyclone separator, and the other end of which is connected to the air inlet channel. A vacuum pump is installed on the negative pressure pipe.

[0027] By adopting the above technical solution, the outlet of the cyclone separator is connected to the inlet channel through a negative pressure pipe, forming a gas circulation loop, which facilitates the recycling of gas and improves the utilization efficiency of the equipment.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The negative pressure extraction component creates a negative pressure inside the system, allowing external gas to enter the screen from the front section. This gas pulls the fine powder inside the screen through the bottom of the screen. After being sieved, the fine powder enters the separation component, which separates the gas from the fine powder, thus collecting the fine powder. This method can accurately sieve the fine powder and reduce the impact of auxiliary sieving media on the fine powder.

[0030] 2. The cyclone separator allows the sieved fine powder to enter the interior of the cyclone separator for centrifugal motion. The larger fine powder is located on the inner wall of the cyclone separator, while the air is located at the center of the cyclone separator, thus achieving the separation of fine powder and air. The separated fine powder falls into the interior of the collector, while the separated gas enters the interior of the negative pressure exhaust assembly. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an automatic fine powder screening device according to an embodiment of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Screening shell; 11. Front section; 12. Rear section; 13. Support plate; 14. Sealing ring; 15. Vibrator; 2. Screen; 21. Screening bottom wall; 22. Screening side wall; 23. Cover plate; 3. Air intake assembly; 31. Air intake channel; 311. Air filter; 32. Air pipe; 321. Air intake section; 322. Diverter section; 4. Separation assembly; 41. Funnel; 42. Cyclone separator; 43. Collector; 5. Negative pressure extraction assembly; 51. Vacuum pump. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0035] Screening is widely used in the mining, metallurgical, building materials, and chemical industries. It is a common and important method for separating and classifying solid particles. In industrial production and mineral analysis, it is often necessary to screen various granular materials to separate and classify them according to particle size.

[0036] In the mining and metallurgical industry, screening is frequently used in the grading and beneficiation of ores. By screening, ores can be separated according to different particle sizes, making subsequent beneficiation work more efficient and precise. In the building materials industry, screening is also required in the production of materials such as cement, sand, gravel, and concrete aggregates to ensure the quality of raw materials and the uniformity of particle size. In the chemical industry, screening granular chemical raw materials ensures the quality of raw materials and reaction efficiency during the production process.

[0037] A standard sieve typically consists of a series of screens with different mesh sizes. Based on the size and shape of the particles, vibration or mechanical motion causes the particles to be classified on the screens. Larger particles cannot pass through the screen mesh and are therefore screened down, while smaller particles pass through. This allows for the separation and classification of particles, resulting in particulate materials of different sizes.

[0038] Regarding the aforementioned technologies, the inventors believe that current sieving methods mainly include vibration separation using vibrating screens and manual separation using brushes, but these methods are extremely difficult for sieving fine powders larger than 200 mesh. In actual operation, washing with water on a standard sieve allows the water flow to separate the fine powder, leaving the coarser components. However, this method is susceptible to errors due to the dissolution of minerals in water.

[0039] In order to accurately screen fine powders and reduce the impact of auxiliary screening media on fine powders, this application provides an automatic fine powder screening device.

[0040] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0041] This application discloses an automatic sieving device for fine powder materials. (Refer to...) Figure 1An automatic fine powder screening device includes a screening shell 1, and a screen 2 is arranged inside the screening shell 1. The screen 2 is horizontally arranged and divides the interior of the screening shell 1 into a front section 11 located above the screen 2 and a rear section 12 located below the screen 2. The front section 11 and the rear section 12 are connected through the screen holes on the screen 2.

[0042] An air intake assembly 3 is located inside the front section 11. This assembly allows outside air to be introduced into the screen 2, agitating the fine powder particles inside. A separation assembly 4 is located inside the rear section 12. A negative pressure extraction assembly 5 is installed on the side wall of the separation assembly 4. The negative pressure extraction assembly 5 creates a negative pressure inside the system, drawing outside air in through the air intake assembly 3. This air then carries the fine powder particles through the screen 2 and into the separation assembly 4 for separation.

[0043] The screening shell 1 is a hollow shell. The air intake assembly 3 includes an air intake channel 31 vertically opened on the top wall of the screening shell 1. The air intake channel 31 connects the outside world with the front section 11. An air filter element 311 is fixedly connected to the screening shell 1 at a position relative to the air intake channel 31. All gas entering the screening shell 1 from the outside through the air intake channel 31 needs to be filtered by the air filter element 311 to improve the purity of screening.

[0044] A support plate 13 is fixedly connected inside the screening shell 1 at a position relative to the screen 2. The support plate 13 is horizontally set and has mounting holes at a position relative to the screen 2.

[0045] The screen 2 is mounted on the support plate 13 through the mounting holes, and a sealing ring 14 is fixedly connected to the outer wall of the screen 2 relative to the position of the support plate 13. Two sealing rings 14 are arranged opposite each other, and the two sealing rings 14 are located on the outer side of the top wall and the outer side of the bottom wall of the screen 2, respectively. The sealing rings 14 seal the connection position between the screen 2 and the support plate 13.

[0046] A vibrator 15 is fixedly connected to the side wall of the support plate 13. When the vibrator 15 receives a signal and generates vibration, the vibration is transmitted to the screen 2 through the support plate 13, so that the screen 2 can vibrate synchronously with the vibration, reducing the clogging of the screen holes by the fine powder inside the screen 2.

[0047] The screen 2 includes a screening bottom wall 21 located at the bottom end. The screening bottom wall 21 is horizontally arranged, and screen holes are opened on the screening bottom wall 21, which connect the interior of the screen 2 with the rear section 12. Screening side walls 22 are fixedly connected to the periphery of the screening bottom wall 21. The screening side walls 22 are vertically arranged, and a cover plate 23 is fixedly connected to the top of the screening side walls 22, which completely covers the screening side walls 22.

[0048] An air pipe 32 is rotatably connected to the cover plate 23. The air pipe 32 includes an air inlet 321. The top end of the air inlet 321 is located inside the front section 11, and the bottom end of the air inlet 321 is located inside the screen 2. The air inlet 321 is rotatably connected to the cover plate 23.

[0049] A diversion section 322 is fixedly connected to the bottom end of the air intake section 321. The diversion section 322 includes multiple air outlets, all of which are in relative communication with the interior of the air intake section 321. The air outlets are inclined in the direction of air discharge, and the inclination direction is inclined from one side of the air intake section 321 toward the outer wall of the screening shell 1.

[0050] A drive motor is fixedly connected to the cover plate 23. The motor shaft of the drive motor is vertically arranged, and a first gear is fixedly connected to the motor shaft of the drive motor. The first gear is coaxial with the motor shaft of the drive motor. A second gear is fixedly connected to the outer wall of the air intake 321. The second gear is coaxial with the air intake 321, and the first gear and the second gear mesh with each other.

[0051] When the motor shaft of the drive motor rotates, the motor shaft drives the first gear to rotate, the first gear drives the second gear to rotate synchronously, and the second gear drives the air intake 321 to rotate. The gas located inside the front section 11 enters the air pipe 32 through the air intake 321, and then enters the screen 2 through the air outlet at the bottom of the diversion section 322. As the air pipe 32 rotates, the gas discharged from the air outlet at the bottom of the diversion section 322 can carry the powder inside the screen 2 to form a fluidized state under the blowing of the gas. Powder with a particle size smaller than the screen hole passes through the screen 2 with the air, while particles with a particle size larger than the screen hole remain inside the screen 2.

[0052] In some embodiments, the separation component 4 includes a funnel 41, the top of which abuts against the bottom wall of the screen 2, and a cyclone separator 42 is fixedly connected to the bottom of the funnel 41, with the inlet end of the cyclone separator 42 communicating with the bottom end of the funnel 41. This allows the fine powder passing through the screen 2 to enter the interior of the cyclone separator 42 with the air. Through the centrifugal force of the cyclone separator 42, the fine powder rotates along the inner wall of the cyclone separator 42, separating the air from the fine powder.

[0053] A collector 43 is provided below the separation component 4. The top opening of the collector 43 is opposite to the bottom material outlet of the cyclone separator 42. The fine powder separated by the cyclone separator 42 enters the interior of the collector 43 through the bottom material outlet.

[0054] The top gas outlet of the cyclone separator 42 is connected to the negative pressure extraction assembly 5. The negative pressure extraction assembly 5 includes a vacuum pump 51. After the vacuum pump 51 is started, it creates a negative pressure inside the system. External gas enters the inside of the screen 2 through the air inlet channel 31. The air carrying the fine powder enters the inside of the cyclone separator 42 through the screen 2 for separation. The separated fine powder enters the collector 43, and the separated gas is extracted by the vacuum pump 51.

[0055] In some other embodiments, the separation component 4 includes a filter bag with a filter hole diameter smaller than that of the screen 2. The inlet end of the filter bag is connected to the bottom end of the screen 2. An air outlet shell is fitted on the outside of the filter bag, which completely covers the outer wall of the filter bag. A vacuum pump 51 is fixedly connected to the side wall of the air outlet shell. The vacuum pump 51 creates a negative pressure inside the air outlet shell, so that the fine powder separated by the screen 2 remains inside the filter bag, and the air is discharged through the filter holes and enters the vacuum pump 51 for discharge.

[0056] The negative pressure extraction assembly 5 also includes a negative pressure pipe. One end of the negative pressure pipe is connected to the outlet end of the vacuum pump 51, and the other end of the negative pressure pipe is connected to the inlet channel 31 of the screening shell 1. This allows the vacuum pump 51 to extract the gas inside the system and then enter the inside of the negative pressure pipe. After circulating through the negative pressure pipe, the gas re-enters the system.

[0057] In this application, the term "multiple" refers to at least two or more, unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. An automatic screening device for fine powder, characterized in that: The device includes a screening shell (1), inside which a screen (2) is provided. The screen (2) divides the screening shell (1) into a front section (11) located above and a rear section (12) located below. An air intake assembly (3) is provided in the front section (11), and a separation assembly (4) for collecting fine powder filtered by the screen (2) is provided in the rear section (12). The side wall of the separation assembly (4) is connected to a negative pressure suction assembly (5).

2. The automatic fine powder screening device according to claim 1, characterized in that: The screening shell (1) is provided with a support plate (13) fixed to the inner wall of the screening shell (1). The screen (2) includes a screening bottom wall (21) with screen holes. Screening side walls (22) are fixedly connected to the periphery of the screening bottom wall (21). A cover plate (23) is provided at the top of the screening side wall (22) above the screening bottom wall (21) and covering the screening bottom wall (21). The screen (2) is installed on the support plate (13).

3. The automatic fine powder screening device according to claim 2, characterized in that: The inner wall of the screening shell (1) is also fixedly connected to a vibrator (15), which drives the screen (2) to vibrate.

4. The automatic fine powder screening device according to claim 2, characterized in that: The air intake assembly (3) includes an air pipe (32) disposed on the cover plate (23), with the air inlet end of the air pipe (32) located above the cover plate (23) and the air outlet end of the air pipe (32) extending into the screen (2).

5. The automatic fine powder screening device according to claim 4, characterized in that: The air tube (32) is rotatably connected to the cover plate (23), and the cover plate (23) is provided with a drive assembly for driving the air tube (32) to rotate.

6. The automatic fine powder screening device according to claim 5, characterized in that: The drive assembly includes a drive motor, a first gear is fixedly connected to the motor shaft of the drive motor, and a second gear is fixedly connected to the side wall of the air pipe (32), with the first gear meshing with the second gear.

7. The automatic fine powder screening device according to claim 5, characterized in that: The air pipe (32) includes an air inlet (321), the top of which is located above the cover plate (23), and the bottom of which extends into the screen (2). The bottom of the air inlet (321) is fixedly connected to a diverter (322), which has multiple air outlets. The multiple air outlets are connected to the air inlet (321), and the air flow directions of the multiple air outlets are staggered.

8. The automatic fine powder screening device according to claim 1, characterized in that: The separation component (4) includes a cyclone separator (42), the inlet end of which is connected to the bottom end of the screen (2), a collector (43) is provided at the bottom outlet end of the cyclone separator (42), and the top outlet end of the cyclone separator (42) is connected to the negative pressure suction component (5).

9. The automatic fine powder screening device according to claim 8, characterized in that: An air intake channel (31) is provided at the top of the screening shell (1), and an air filter element (311) is fixedly connected to the screening shell (1) relative to the air intake channel (31). The air filter element (311) is located on the front section (11).

10. The automatic fine powder screening device according to claim 9, characterized in that: The negative pressure suction assembly (5) includes a negative pressure pipe. One end of the negative pressure pipe is connected to the outlet of the cyclone separator (42), and the other end of the negative pressure pipe is connected to the air inlet channel (31). A vacuum pump (51) is installed on the negative pressure pipe.

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