Screening machine

Abstract

The invention discloses a screening machine and belongs to the technical field of screening machines, the screening machine comprises a screening box, a conical table and a center column, a coarse filter plate, a middle filter plate and a fine filter plate are arranged in an inner cavity of the screening box, spring dampers and first connecting pieces are installed on the coarse filter plate and the middle filter plate, and cleaning rods are installed on the surfaces of the first connecting pieces; a rotating motor is fixed to the bottom wall of an inner cavity of the center column, a rotating rod is fixed to the top of the rotating motor, a conical cover is fixed to the top of the rotating rod, and an air spraying shell is embedded in the center column; a guide plate rotates in an inner cavity of the air injection shell, a dustproof plate slides on an air injection opening of the air injection shell, an impact rod is fixed to the first connecting piece, and the center column communicates with an air blowing fan arranged on the outer wall of the screen box. The problems that the screen is blocked, the screening efficiency is low, the grading precision is insufficient, and maintenance is complex can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of screening machines, in particular to a screening machine. Background Art

[0002] As a commonly used material separation equipment, screening machine is widely used in chemical industry, metallurgy, food processing, mineral processing and other fields. Its main function is to separate materials of different particle sizes through the screen to meet the needs of subsequent processing or specific applications.

[0003] However, during the operation of existing screening machines, fine particles are very likely to adhere to the screen, causing the screen to become clogged. Such clogging problems not only significantly reduce the screening efficiency, but also interrupt the operation of the equipment, requiring frequent shutdowns for manual cleaning, which is time-consuming and labor-intensive, and significantly increases the operating costs of the equipment. In addition, the overall structural design of the screening equipment is relatively complex, resulting in high difficulty in the disassembly, replacement and maintenance of the screen. Summary of the invention

[0004] The purpose of the invention is to solve the problems of screen blockage, low screening efficiency, insufficient classification accuracy and complex maintenance.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a screening machine, comprising a screen box, a conical table and a central column, wherein the inner cavity of the screen box is provided with a coarse filter plate, a medium filter plate and a fine filter plate in sequence from top to bottom, the coarse filter plate and the medium filter plate are both provided with a first connecting piece equipped with a plurality of spring shock absorbers, a cleaning rod is provided on the surface of the first connecting piece connected to the coarse filter plate, the spring shock absorber is fixedly connected to the inner cavity wall of the screen box and the outer wall of the central column, the fine filter plate is fixed to the inner cavity wall of the screen box through a second connecting piece, an ultrasonic generator for driving the first connecting piece to vibrate is provided on the outer wall of the screen box, and a negative pressure fan is provided at the bottom of the screen box; A rotating motor is fixed to the bottom wall of the inner cavity of the central column, a rotating rod penetrating the central column is fixed to the top of the rotating motor, a conical cover that can drive the coarse filter plate and the medium filter plate to rotate is fixed to the top of the rotating rod, at least two jet shells are inlaid in the central column, a guide plate with inclined holes rotates in the inner cavity of the jet shell, the rotating rod drives the guide plate to rotate through a number of bevel gears, a dustproof plate slides on the jet port of the jet shell, a first connecting piece connected to the medium filter plate is fixed with an impact rod that impacts the dustproof plate, and the central column is connected to the air blowing fan arranged on the outer wall of the screen box through a pipeline.

[0006] As a further description of the above technical solution: the screen box is designed in sections and fixed together by bolts, the conical platform is fixed to the bottom wall of the inner cavity of the screen box and has a plurality of strip holes on the surface, and the bottom of the center column is fixedly connected to the top of the conical platform.

[0007] As a further description of the above technical solution: an air supply pipe connected to the negative pressure fan is fixed to the bottom of the screen box, a plurality of discharge pipes are fixed to the outer ring of the screen box, a top cover is installed on the top of the screen box, and a feed pipe is connected to the top of the top cover.

[0008] As a further description of the above technical solution: a dustproof shell is installed at the bottom of the inner cavity of the screen box, and a dustproof net is embedded in the ventilation holes provided on the surface of the dustproof shell.

[0009] As a further description of the above technical solution: the coarse filter plate and the medium filter plate are rotatably connected to the first connecting piece, a rectangular hole is provided on the surface of the coarse filter plate, a driving rod penetrating into the rectangular hole is fixed to the bottom of the conical cover, and the transmission rod is fixed between the coarse filter plate and the medium filter plate.

[0010] As a further description of the above technical solution: a plurality of ventilation holes are provided at one end of the jet shell located in the inner cavity of the central column, a return spring is installed on the dustproof plate, and the other end of the return spring is fixedly connected to the inner wall of the jet shell.

[0011] As a further description of the above technical solution: the outer ring fixed sleeve of the rotating rod is provided with a main bevel gear, the main bevel gear is meshed with at least two auxiliary bevel gears, and the auxiliary bevel gears are fixed with a rotating shaft that penetrates the jet shell and is fixedly connected to the guide plate.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. A coarse filter plate, a medium filter plate and a fine filter plate are arranged in the inner cavity of the screen box, thus forming a three-stage screening structure. The rotary motor drives the conical cover to rotate through the rotary rod, thereby driving the coarse filter plate and the medium filter plate to rotate synchronously. At the same time, the ultrasonic generator transmits the vibration energy to the coarse filter plate and the medium filter plate through the first connecting piece, and utilizes the rotating action to realize the uniform distribution of the material on the screen, and effectively reduces the adhesion of the material through high-frequency vibration, thereby significantly improving the screening efficiency. At the same time, the structure can effectively prevent the screen from being blocked and ensure the continuity of the screening process.

[0013] 2. The center column is embedded with a jet shell, which has a built-in guide plate. The inclined holes on the guide plate are used to adjust the jet direction. The air blower delivers airflow to the center column through a pipeline. The airflow is sprayed out through the jet shell and covers the surface of the middle filter plate. The rotary motor drives the guide plate to rotate through the bevel gear system, so that the jet direction dynamically covers the surface of the middle filter plate, realizing efficient cleaning of waste chips on the surface of the middle filter plate. This design effectively solves the problem of screen blockage and significantly improves the reliability of continuous operation of the equipment.

[0014] 3. A negative pressure fan is installed at the bottom of the screen box, which forms a negative pressure environment inside the screen box through the air pipe to guide the material through the screen. When the fine filter plate is blocked, the negative pressure fan switches to the reverse inflation mode to blow the blocked material to the top of the fine filter plate to prevent blockage, thereby achieving smooth passage of the material, reducing the maintenance frequency of the equipment, and improving the automation level of the screening equipment.

[0015] 4. A cleaning rod is installed on the surface of the coarse filter plate, which performs self-cleaning operation on the surface of the coarse filter plate during rotation; the first connecting piece impacts the dustproof plate through the impact rod, thereby removing the attachments on the surface of the dustproof plate. This design further enhances the anti-blocking function of the screening machine, improves the overall anti-blocking ability of the equipment, reduces the need for manual intervention, and effectively improves the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A front view of the present invention is shown; Figure 2 A front cross-sectional view of the present invention is shown; Figure 3 A side cross-sectional view of the present invention is shown; Figure 4 The present invention is shown Figure 3 The enlarged view of point A in the middle; Figure 5 A perspective cutaway view of the present invention is shown; Figure 6 A perspective view of the coarse filter plate, the first connecting member and the conical cover of the present invention is shown; Figure 7 A three-dimensional view of the main bevel gear and the auxiliary bevel gear of the present invention is shown.

[0017] Legend: 10. Screen box; 101. Conical table; 102. Center column; 103. Blowing fan; 104. Air pipe; 105. Discharge pipe; 106. Dust cover; 107. Dust net; 11. Coarse filter plate; 12. Medium filter plate; 13. Fine filter plate; 14. Spring shock absorber; 15. First connecting piece; 151. Cleaning rod; 152. Impact rod; 16. Second connecting piece; 17. Ultrasonic generator; 18. Negative pressure fan; 19. Top cover; 191. Feed pipe; 20. Rotating motor; 21. Rotating rod; 22. Conical cover; 221. Driving rod; 23. Jet shell; 24. Guide plate; 25. Dust plate; 26. Transmission rod; 27. Return spring; 28. Main bevel gear; 29. ​​Sub bevel gear; 291. Rotating shaft. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 7 The present invention provides a technical solution: a screening machine, comprising a screen box 10, a conical table 101 and a central column 102. The screen box 10 serves as the main frame of the entire screening machine and provides space for installing and protecting internal components. A coarse filter plate 11, a medium filter plate 12 and a fine filter plate 13 are provided in the inner cavity of the screen box 10 from top to bottom. The coarse filter plate 11 and the medium filter plate 12 are both provided with a first connecting piece 15 equipped with a plurality of spring shock absorbers 14. A cleaning rod 151 is installed on the surface of the first connecting piece 15 connected to the coarse filter plate 11. The spring shock absorber 14 is fixedly connected to the inner cavity wall of the screen box 10 and the outer wall of the central column 102. The fine filter plate 13 is fixed to the inner cavity wall of the screen box 10 through a second connecting piece 16. An ultrasonic generator 17 for driving the first connecting piece 15 to vibrate is provided on the outer wall of the screen box 10. A negative pressure fan 18 is provided at the bottom of the screen box 10.

[0020] The ultrasonic generator 17 uses the high-frequency vibration of ultrasonic waves to vibrate the outside of the middle filter plate 12, thereby reducing the adhesion of the material on the screen and promoting the smooth passage of the material through the screen. The ultrasonic generator 17 is composed of the following components: an ultrasonic transducer for converting electrical signals into mechanical vibrations; a vibration plate or vibrator for transmitting vibrations to the middle filter plate 12 to prevent clogging and improve the screening effect; a power supply and control unit for adjusting the frequency and power of ultrasonic waves to ensure that the equipment is always in the best working condition.

[0021] A rotating motor 20 is fixed to the bottom wall of the inner cavity of the central column 102, a rotating rod 21 penetrating the central column 102 is fixed to the top of the rotating motor 20, a conical cover 22 capable of driving the coarse filter plate 11 and the medium filter plate 12 to rotate is fixed to the top of the rotating rod 21, the central column 102 is inlaid with at least two jet shells 23, a guide plate 24 with inclined holes rotates in the inner cavity of the jet shell 23, the rotating rod 21 drives the guide plate 24 to rotate through a number of bevel gears, a dustproof plate 25 slides at the jet port of the jet shell 23, a first connecting piece 15 connected to the medium filter plate 12 is fixed with an impact rod 152 that impacts the dustproof plate 25, and the central column 102 is connected to the air blowing fan 103 arranged on the outer wall of the screen box 10 through a pipeline.

[0022] A coarse filter plate 11, a medium filter plate 12 and a fine filter plate 13 are provided in the inner cavity of the screen box 10, thereby forming a three-stage screening structure. The rotating motor 20 drives the conical cover 22 to rotate through the rotating rod 21, thereby driving the coarse filter plate 11 and the medium filter plate 12 to achieve synchronous rotation. At the same time, the ultrasonic generator 17 transmits vibration energy to the coarse filter plate 11 and the medium filter plate 12 through the first connecting piece 15, and utilizes the rotating action to achieve uniform distribution of materials on the screen, and effectively reduces the adhesion of materials through high-frequency vibration, thereby significantly improving the screening efficiency. At the same time, the structure can effectively prevent the screen from being blocked and ensure the continuity of the screening process.

[0023] The central column 102 is embedded with a jet shell 23, and the jet shell 23 has a built-in guide plate 24. The inclined hole on the guide plate 24 is used to adjust the jet direction. The air blower 103 delivers airflow to the central column 102 through a pipeline. The airflow is sprayed out through the jet shell 23 and covers the surface of the middle filter plate 12. The rotating motor 20 drives the guide plate 24 to rotate through the bevel gear system, so that the jet direction dynamically covers the surface of the middle filter plate 12, thereby achieving efficient cleaning of waste debris on the surface of the middle filter plate 12. This design effectively solves the problem of screen blockage and significantly improves the reliability of continuous operation of the equipment.

[0024] A negative pressure fan 18 is installed at the bottom of the screen box 10, and a negative pressure environment is formed inside the screen box 10 through the air pipe 104 to guide the material to pass through the screen. When the fine filter plate 13 is blocked, the negative pressure fan 18 switches to the reverse inflation mode to blow the blocked material to the top of the fine filter plate 13 to prevent blockage, thereby achieving smooth passage of the material, reducing the maintenance frequency of the equipment, and improving the automation level of the screening equipment.

[0025] A cleaning rod 151 is installed on the surface of the coarse filter plate 11, which performs a self-cleaning operation on the surface of the coarse filter plate 11 during rotation; the first connecting member 15 impacts the dustproof plate 25 through the impact rod 152, thereby removing the attachments on the surface of the dustproof plate 25. This design further enhances the anti-blocking function of the screening machine, improves the overall anti-blocking ability of the equipment, reduces the need for manual intervention, and effectively improves the screening efficiency.

[0026] Furthermore, the screen box 10 is designed in sections and fixed together by bolts. The conical platform 101 is fixed to the bottom wall of the inner cavity of the screen box 10 and has a plurality of strip holes on the surface. The bottom of the central column 102 is fixedly connected to the top of the conical platform 101.

[0027] The segmented design of the screen box 10 makes it easy to assemble and disassemble the screen box 10, and is convenient for adjusting the height and maintenance; the screen box 10 uses metal or plastic materials to increase strength and durability.

[0028] Furthermore, an air supply pipe 104 connected to the negative pressure fan 18 is fixed to the bottom of the screen box 10, a plurality of discharge pipes 105 are fixed to the outer ring of the screen box 10, a top cover 19 is installed on the top of the screen box 10, and a feed pipe 191 is connected to the top of the top cover 19.

[0029] During operation, the material to be screened is fed into the screen box 10 from the feed pipe 191. After the screening process, materials of different specifications are discharged from the corresponding discharge pipes 105. After the material enters the screen box 10, the negative pressure fan 18 will generate a negative pressure environment to provide sufficient suction force to guide the material to be screened through the screen. In addition, when the screen is blocked, the system applies a reverse airflow to the screen to blow the blocked material to the top of the screen to ensure that the material can continue to pass smoothly.

[0030] Furthermore, a dustproof shell 106 is installed at the bottom of the inner cavity of the screen box 10, and a dustproof net 107 is embedded in the ventilation holes provided on the surface of the dustproof shell 106.

[0031] When the negative pressure fan 18 is running, a suction force is generated, which is transmitted to the inner cavity of the conical table 101 and the inner cavity wall of the screen box 10 through the air supply pipe 104, and is further transmitted to the outside of the conical table 101 through the strip holes, and then transmitted to the outside of the dustproof shell 106 through the ventilation holes, thereby guiding the screened material to pass through the screen.

[0032] Even if some fine materials pass through the fine filter plate 13 at the bottom, the dust net 107 can effectively prevent these materials from entering the negative pressure fan 18, thereby avoiding damage to the negative pressure fan 18. At the same time, the dust shell 106 and the bottom wall of the inner cavity of the screen box 10 together form a waste storage space. In addition, the surface of the dust shell 106 is designed to be an inclined structure, and the materials blocked by the dust net 107 will naturally slide into the waste storage space.

[0033] Furthermore, the coarse filter plate 11 and the medium filter plate 12 are rotatably connected to the first connecting member 15, a rectangular hole is provided on the surface of the coarse filter plate 11, a driving rod 221 penetrating into the rectangular hole is fixed to the bottom of the conical cover 22, and a transmission rod 26 is fixed between the coarse filter plate 11 and the medium filter plate 12.

[0034] When the rotating motor 20 drives the conical cover 22 to rotate, the conical cover 22 drives the coarse filter plate 11 to rotate through the driving rod 221, and the coarse filter plate 11 drives the medium filter plate 12 to rotate synchronously through the transmission rod 26, thereby, both the coarse filter plate 11 and the medium filter plate 12 realize rotation operation in the first connecting member 15.

[0035] Since the size of the rectangular hole is much larger than the diameter of the driving rod 221, even if the coarse filter plate 11 vibrates, it will not affect the normal rotation of the driving rod 221 and the coarse filter plate 11 itself. In addition, a corresponding shock-absorbing structure, such as a spring or a flexible pad, may be provided at the outer circle where the driving rod 221 extends to the rectangular hole to effectively prevent the driving rod 221 from colliding with the surface of the rectangular hole and causing damage to related components.

[0036] Furthermore, a plurality of ventilation holes are provided at one end of the jet shell 23 located in the inner cavity of the central column 102 , and a return spring 27 is installed on the dustproof plate 25 , and the other end of the return spring 27 is fixedly connected to the inner wall of the jet shell 23 .

[0037] When the ultrasonic generator 17 drives the first connecting member 15 to vibrate, the first connecting member 15 drives the coarse filter plate 11 and the medium filter plate 12 to vibrate. At the same time, the first connecting member 15 hits the dustproof plate 25 through the impact rod 152, and the materials and dirt on the surface of the dustproof plate 25 can be cleaned off during the impact.

[0038] Furthermore, the outer ring of the rotating rod 21 is fixedly sleeved with a main bevel gear 28 , which is meshed with at least two auxiliary bevel gears 29 , and the auxiliary bevel gears 29 are fixed with a rotating shaft 291 that penetrates the jet housing 23 and is fixedly connected to the guide plate 24 .

[0039] During operation, the rotating rod 21 not only drives the conical cover 22 to rotate, but also drives the main bevel gear 28 to rotate, thereby driving the two auxiliary bevel gears 29 to rotate, and further driving the guide plate 24 to rotate.

[0040] The use process of the present invention: The material to be screened is evenly fed into the top of the inner cavity of the screen box 10 through the feed pipe 191. After the rotating motor 20 is started, the conical cover 22 is driven to rotate through the rotating rod 21; the conical cover 22 directly drives the coarse filter plate 11 to rotate through the driving rod 221, and drives the medium filter plate 12 to achieve synchronous rotation through the transmission rod 26. At the same time, after the ultrasonic generator 17 is started, the first connecting member 15 is driven to vibrate through high-frequency vibration, and the vibration is further transmitted to the coarse filter plate 11 and the medium filter plate 12, so that the two generate vibration while rotating. The effect of vibration not only effectively reduces material adhesion, but also significantly improves the screening efficiency and effectively prevents the screen from being blocked.

[0041] The coarse filter plate 11 is responsible for the preliminary screening of larger particles. Materials that meet the particle size requirements are screened through its pores, and large particles that fail to pass the screening slide along the plate surface under the combined action of rotation and vibration, and are finally discharged through the discharge pipe 105; the medium filter plate 12 further screens the medium-sized particle materials screened by the coarse filter plate 11, and passes the materials that meet the requirements through its screen; the fine filter plate 13 performs the final fine screening of the materials screened by the medium filter plate 12 to ensure that the materials are accurately classified by particle size; after step-by-step screening by multiple layers of screens, materials of different particle sizes are discharged separately through the discharge pipe 105 on the periphery of the screen box 10, thereby achieving accurate classification of materials.

[0042] During the screening process, the rotation of the coarse filter plate 11 causes its surface to continuously slide over the cleaning rod 151, thereby effectively preventing the surface of the coarse filter plate 11 from being blocked; at the same time, the air blowing fan 103 will be started to convey the airflow to the inner cavity of the central column 102 through the pipeline, and the airflow enters the interior of the jet shell 23 through the air vent of the jet shell 23 and is then ejected. The ejected gas is guided through the inclined hole of the guide plate 24 to form a rotating airflow. During the jetting process, since the middle filter plate 12 is in a rotating state, the jetting direction can evenly cover the surface of the middle filter plate 12, thereby effectively preventing the material on the surface of the middle filter plate 12 from being blocked.

[0043] During the screening process, the negative pressure fan 18 is always in operation, and the negative pressure it generates acts on the space between the outer wall of the dust cover 106 and the inner wall of the screen box 10 through the air pipe 104, thereby further guiding the material to move toward the screen. When the fine filter plate 13 detects a blockage, the negative pressure fan 18 switches to the reverse inflation mode, releases the airflow through the air pipe 104, cleans the blocked material and throws it to the top of the fine filter plate 13, thereby ensuring the patency of the fine filter plate 13.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A screening machine comprising a screen box (10), a conical table (101) and a central column (102), characterized in that: The inner cavity of the screen box (10) is provided with a coarse filter plate (11), a medium filter plate (12) and a fine filter plate (13) in order from top to bottom. The coarse filter plate (11) and the medium filter plate (12) are both provided with a first connecting piece (15) equipped with a plurality of spring shock absorbers (14). A cleaning rod (151) is installed on the surface of the first connecting piece (15) connected to the coarse filter plate (11). The spring shock absorber (14) is fixedly connected to the inner cavity wall of the screen box (10) and the outer wall of the central column (102). The fine filter plate (13) is fixed to the inner cavity wall of the screen box (10) via a second connecting piece (16). An ultrasonic generator (17) for driving the first connecting piece (15) to vibrate is provided on the outer wall of the screen box (10). A negative pressure fan (18) is provided at the bottom of the screen box (10); A rotating motor (20) is fixed to the bottom wall of the inner cavity of the central column (102); a rotating rod (21) penetrating the central column (102) is fixed to the top of the rotating motor (20); a conical cover (22) capable of driving the coarse filter plate (11) and the middle filter plate (12) to rotate is fixed to the top of the rotating rod (21); at least two jet shells (23) are inlaid in the central column (102); a guide plate (24) with an inclined hole is rotatably provided in the inner cavity of the jet shell (23); the rotating rod (21) drives the guide plate (24) to rotate via a plurality of bevel gears; a dustproof plate (25) is slidably provided at the jet port of the jet shell (23); a first connecting member (15) connected to the middle filter plate (12) is fixed with a striking rod (152) for striking the dustproof plate (25); and the central column (102) is connected to an air blowing fan (103) arranged on the outer wall of the screen box (10) via a pipeline.

2. The screening machine according to claim 1, characterized in that: The screen box (10) is designed in sections and is fixed together by bolts. The conical platform (101) is fixed to the bottom wall of the inner cavity of the screen box (10) and has a plurality of strip holes on its surface. The bottom of the central column (102) is fixedly connected to the top of the conical platform (101).

3. The screening machine according to claim 1, characterized in that: An air delivery pipe (104) connected to a negative pressure fan (18) is fixed at the bottom of the screen box (10), a plurality of discharge pipes (105) are fixed to the outer ring of the screen box (10), a top cover (19) is installed on the top of the screen box (10), and a feed pipe (191) is connected to the top of the top cover (19).

4. The screening machine according to claim 1, characterized in that: A dustproof shell (106) is installed at the bottom of the inner cavity of the screen box (10), and a dustproof net (107) is embedded in ventilation holes provided on the surface of the dustproof shell (106).

5. The screening machine according to claim 1, characterized in that: The coarse filter plate (11) and the medium filter plate (12) are rotatably connected to the first connecting member (15); a rectangular hole is provided on the surface of the coarse filter plate (11); a driving rod (221) penetrating the rectangular hole is fixed to the bottom of the conical cover (22); and a driving rod (26) is fixed between the coarse filter plate (11) and the medium filter plate (12).

6. The screening machine according to claim 1, characterized in that: The jet shell (23) is provided with a plurality of vent holes at one end of the inner cavity of the central column (102), and the dustproof plate (25) is provided with a return spring (27), the other end of the return spring (27) being fixedly connected to the inner wall of the jet shell (23).

7. The screening machine according to claim 1, characterized in that: The outer ring fixed sleeve of the rotating rod (21) is provided with a main bevel gear (28), the main bevel gear (28) is meshed with at least two auxiliary bevel gears (29), and the auxiliary bevel gears (29) are fixed with a rotating shaft (291) that penetrates the jet shell (23) and is fixedly connected to the guide plate (24).

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