Weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen

Abstract

This invention relates to the field of airflow vibration composite screening technology, specifically a weather-resistant vibrating screen for precise grading and anti-clogging of MBS resin powder. It includes a mounting platform equipped with a vibration generating component, a grading and screening component, and a pneumatic anti-clogging component. The screen features switchable vibration modes and, through a rotating screen, pneumatic anti-clogging design, and independent discharge, achieves precise grading and anti-clogging of MBS resin powder, improving equipment stability and continuous operation efficiency, thus meeting the demands of refined industrial production. This invention solves the problems of traditional vibrating screening equipment used for precise MBS powder grading, such as a single vibration mode, unstable operation, easy material accumulation on the screen plate leading to low grading accuracy, easy adhesion of MBS powder to the screen walls and clogging of holes, inability to independently and accurately collect graded and discharged materials, poor automation and continuous operation, and insufficient adaptability.

Description

Technical Field

[0001] This invention relates to the field of airflow vibration composite screening technology, specifically to a weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen. Background Technology

[0002] Weather-resistant MBS resin powder, as an important polymer modified material, is widely used in many industrial fields such as plastics, coatings, and building materials. Its product performance is closely related to the uniformity of powder particle size, so it needs to be precisely graded during the production process.

[0003] Currently, most of the equipment used for MBS resin powder classification in industry is the traditional vibrating screen. This type of vibrating screen has a simple structure and low cost. However, in practical applications, due to the inherent characteristics of weather-resistant MBS resin powder and the design defects of traditional equipment, there are many problems that need to be solved. These problems severely restrict the classification efficiency, classification accuracy and continuous operation capability of the equipment, and cannot meet the needs of industrialized and refined production.

[0004] Weather-resistant MBS resin powder has a certain degree of viscosity, which easily adheres to the screening screen and the inner wall of the equipment during the classification process, causing screen blockage and powder accumulation. This not only requires frequent machine shutdowns for cleaning, increasing manual labor intensity, but also reduces screening efficiency and affects production continuity. At the same time, the vibration mode of traditional vibrating screens is singular and cannot be adapted to MBS resin powders with different flowability and agglomeration states, which easily leads to powder agglomeration and uneven screening, resulting in low classification accuracy and difficulty in obtaining finished powder with uniform particle size.

[0005] In addition, traditional vibrating screens have poor stability during vibration, and are prone to problems such as excessive amplitude and equipment deviation and shaking, which not only affect the classification accuracy, but also shorten the service life of the equipment. Their classification and discharge structure design is unreasonable, mostly with a single discharge port, which cannot achieve synchronous and independent collection of powders of multiple particle sizes, and is prone to mixing of powders of different particle sizes, further reducing the purity of the finished product.

[0006] In response to the aforementioned industry pain points, there is an urgent need to develop a specialized device that can solve problems such as sticking, vibration instability, and low classification accuracy, and is suitable for the classification of weather-resistant MBS resin powder. Therefore, this invention was developed. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a weather-resistant vibrating screen for precise grading and anti-clogging of MBS resin powder. This screen solves the problems of traditional vibrating screening equipment when used for precise grading of MBS powder, such as single vibration mode, unstable operation, easy accumulation of material on the screening screen leading to low grading accuracy, easy adhesion of MBS powder to the screen wall and clogging of the holes, inability to independently and accurately collect graded and discharged materials, poor automation and continuous operation, and insufficient adaptability.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen includes a mounting platform, on which a vibration generating component, a grading and screening component, and a pneumatic anti-clogging component are respectively provided.

[0010] As an optimized solution, the vibration generating component includes a positioning sleeve, the lower end of which is welded to the upper surface of the mounting platform, and four sets of centrally symmetrical motor mounting brackets are welded to the outer peripheral wall of the positioning sleeve.

[0011] As an optimized solution, a vibration generating motor is fixed on the upper surface of the motor mounting base, and a rotating cam is fixed to the end of the output shaft of the vibration generating motor.

[0012] As an optimized solution, a number of spring vibrators are fixed in the middle of the upper surface of the mounting platform, and a vibration support plate is fixed to the upper end of the spring vibrators.

[0013] As an optimized solution, the vibration support plate is a horizontally arranged square plate, and the four rotating cams abut against the upper surfaces of the four corners of the vibration support plate.

[0014] As an optimized solution, the grading and screening assembly includes a grading and screening cylinder, the lower end of which is welded to the vibrating support plate.

[0015] As an optimized solution, the pneumatic anti-sticking assembly includes four annular air boxes arranged equidistantly from top to bottom, with the outer circumferential wall of the annular air boxes fixed to the inner circumferential wall of the grading and screening cylinder.

[0016] As an optimized solution, each of the annular bellows has a supporting retaining ring fixed on its upper surface.

[0017] As an optimized solution, the grading and screening assembly further includes three flange seats, which are rotatably clamped between the four annular air boxes. The lower end of each flange seat is rotatably fitted onto the support ring, and the upper surface of each flange seat is set in close contact with the lower surface of the annular air box.

[0018] As an optimized solution, a screening screen plate is fixedly installed in the central opening of each flange seat, and the mesh size of the three screening screen plates decreases sequentially from top to bottom.

[0019] As an optimized solution, four centrally symmetrical support vertical plates are welded to the upper surface side edge of the mounting platform, and the four support vertical plates are alternately arranged with the four motor mounting seats.

[0020] As an optimized solution, a horizontal limiting plate is fixed to the upper end of the four supporting vertical plates, and a circular limiting port is opened in the middle of the horizontal limiting plate. The inner diameter of the circular limiting port is larger than the outer diameter of the grading screening cylinder.

[0021] As an optimized solution, a rubber-coated sleeve is fixed on the inner peripheral wall of the circular limiting port.

[0022] As an optimized solution, the grading and screening cylinder is provided with a filling counterweight. The lower end of the filling counterweight is fixed to the vibrating support plate, the outer peripheral wall of the filling counterweight is closely attached to the inner peripheral wall of the grading and screening cylinder, and the lower surface of the annular wind box at the bottom is closely attached to the upper surface of the filling counterweight.

[0023] As an optimized solution, each of the annular bellows has four centrally symmetrical connecting ports on its inner circumferential wall, and each connecting port is fixed with a grid, with the gap between the four sets of grids decreasing sequentially from top to bottom.

[0024] As an optimized solution, four square air ducts are fixed on the circumferential outer wall of the grading and screening cylinder corresponding to the four annular air boxes. The square air ducts are connected to the annular air boxes and are arranged symmetrically in rotation.

[0025] As an optimized solution, a sealing cover is fixed to the open end of each square air duct, a discharge pipe connected to the lower surface of the square air duct near the end is fixed thereto, and a centrifugal fan connected to the side end face of the square air duct near the end is fixed thereto.

[0026] As an optimized solution, each of the square air ducts is equipped with a three-way switching valve, which is located between the discharge pipe and the centrifugal fan. A switching control module electrically connected to the three-way switching valve is fixed on the closed cover plate.

[0027] As an optimized solution, a transmission gear ring is fixed on the outer peripheral wall of the lower half of each flange seat.

[0028] As an optimized solution, three transmission boxes are fixed on the circumferential outer wall of the grading and screening cylinder corresponding to the three flange seats, and the transmission boxes are connected to the grading and screening cylinder.

[0029] As an optimized solution, a transmission motor is fixed on the upper surface of each transmission box near the end. The output shaft end of the transmission motor passes through the upper wall of the transmission box and is fixed with a transmission gear. A transmission chain is sleeved between the transmission gear and the transmission gear ring.

[0030] As an optimized solution, an extended feeding cylinder is fixed to the upper end of the grading and screening cylinder. The extended feeding cylinder has openings at the top and bottom. An inclined guide block is fixed on the inner peripheral wall of the grading and screening cylinder near the upper opening. The lower end of the inclined guide block is closely attached to the upper surface of the uppermost annular air box.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. Vibration modes can be flexibly switched to adapt to different powder flowability.

[0033] The equipment supports two working modes: vertical reciprocating vibration and circumferential reciprocating vibration. The mode can be switched according to the actual flowability, humidity, and agglomeration state of the weather-resistant MBS resin powder. The two vibration modes, combined with a spring vibrator, effectively loosen the powder, prevent material agglomeration, and significantly improve the screening adaptability and efficiency for different batches and states of resin powder.

[0034] 2. Vibration operation is stable and reliable, and the screening process is not prone to deviation or shaking.

[0035] The filling counterweight is set close to the inner wall of the grading and screening cylinder, which not only improves the overall vibration quality of the cylinder, but also prevents powder from getting stuck in the gaps in the cylinder wall, causing jamming and wear. Combined with the radial limiting effect of the horizontal limiting plate and the rubber covering sleeve, it can effectively constrain the cylinder amplitude and prevent problems such as shaking, deviation and abnormal noise during vibration. The equipment runs more smoothly and has stronger stability for long-term continuous operation.

[0036] 3. The rotating screen plate, combined with vibration, ensures uniform powder dispersion and high screening accuracy.

[0037] Three sets of screening screens can rotate independently under the drive of a transmission motor, evenly spreading the falling powder and avoiding local accumulation and uneven screening. Combined with the overall vibration of the cylinder, the material continuously tumbles and disperses on the screen surface. The multi-stage screens screen from top to bottom, accurately distinguishing multiple particle size ranges, achieving fine grading of weather-resistant MBS resin powder, and effectively improving product particle size uniformity and grading qualification rate.

[0038] 4. Pneumatic swirl prevents clogging, solving the problems of hole blockage and wall adhesion at the root.

[0039] Addressing the issue of MBS resin powder easily sticking to the screen and clogging the pores, the equipment employs a combination of an annular airbox and a centrifugal fan to create a swirling airflow. This airflow directly acts on the screen surface and cylinder wall, powerfully dispersing accumulated powder and peeling off adhered materials. Combined with the rotation of the screen and the vibration of the cylinder, multiple anti-clogging mechanisms are achieved. This fundamentally solves the problems of frequent clogging and shutdowns for screen cleaning common in traditional vibrating screens, significantly improving continuous operation time and screening smoothness.

[0040] 5. The graded discharge system is independently controllable, enabling precise and targeted collection.

[0041] Each screening layer can be independently controlled by a three-way switching valve and a centrifugal fan for forward and reverse rotation. Forward air supply prevents blockage, while reverse material extraction and discharge ensures no interference between the two systems. This allows for precise extraction and directional discharge of single-size powders, preventing mixing of materials of different particle sizes. It enables simultaneous grading and collection of powders of multiple specifications, improving grading efficiency and finished product purity, and meeting the requirements of refined production.

[0042] 6. The entire process is continuously automated, balancing efficiency and safety.

[0043] The equipment can achieve continuous cyclic operation throughout the entire process, from feeding, vibration loosening, rotary screening, pneumatic anti-sticking, to grading and discharge. It has a high degree of automation and reduces manual intervention. When the machine stops, all components shut down in an orderly manner, and the vibrating tray returns to its original position smoothly under the action of the spring vibrator. It is simple to operate and easy to maintain. The overall structural design takes into account screening accuracy, processing efficiency, and safety, and is highly adaptable to the industrial grading and processing needs of weather-resistant MBS resin powder. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0045] Figure 1 This is a schematic diagram of the overall external structure of the present invention in the main viewing direction;

[0046] Figure 2 This is a schematic diagram of the overall external structure of the present invention from the right-side view direction;

[0047] Figure 3 This is a schematic diagram of the overall external structure of the present invention from a top-down perspective;

[0048] Figure 4 This is an isometric schematic diagram of the three-dimensional structure of the present invention;

[0049] Figure 5 For the present invention along Figure 3 A schematic diagram of the internal structure cut along line AA.

[0050] Figure 6 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the middle BB line;

[0051] Figure 7 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the CC line;

[0052] Figure 8 For the present invention along Figure 3 A schematic diagram of the internal structure cut along the DD line in the middle;

[0053] Figure 9 For the present invention along Figure 2 A schematic diagram of the internal structure cut along the EE line.

[0054] In the diagram: 1-Mounting platform, 2-Positioning sleeve, 3-Motor mounting base, 4-Vibration generator motor, 5-Rotating cam, 6-Spring vibrator, 7-Vibration support plate, 8-Grading screening cylinder, 9-Filling counterweight, 10-Supporting vertical plate, 11-Horizontal limit plate, 12-Circular limit port, 13-Rubber-coated sleeve, 14-Annular bellows, 15-Connecting port, 16-Grate, 17-Square duct, 18-Closed cover plate, 19-Discharge pipe, 20-Centrifugal fan, 21-Three-way conversion valve, 22-Conversion control module, 23-Support retaining ring, 24-Flange seat, 25-Transmission gear ring, 26-Transmission box, 27-Transmission motor, 28-Transmission gear, 29-Transmission chain, 30-Screening screen plate, 31-Extended feeding cylinder, 32-Inclined guide block. Detailed Implementation

[0055] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0056] like Figures 1 to 9 As shown, the weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen includes a mounting platform 1, which is a horizontally grounded square platform. The mounting platform 1 is equipped with a vibration generating component, a grading and screening component, and a pneumatic anti-clogging component.

[0057] The vibration generating component includes a positioning sleeve 2, the lower end of which is welded to the upper surface of the mounting base 1. Four sets of centrally symmetrical motor mounting seats 3 are welded to the outer peripheral wall of the positioning sleeve 2. The motor mounting seats 3 are inverted L-shaped seats.

[0058] Each motor mounting base 3 has a vibration generating motor 4 fixed on its upper surface, and a rotating cam 5 is fixed to the end of the output shaft of the vibration generating motor 4.

[0059] The positioning sleeve 2 is equipped with several spring vibrators 6. The lower end of the spring vibrators 6 is fixed on the upper surface of the mounting platform 1, and the upper end of the several spring vibrators 6 is fixed with a vibration support plate 7.

[0060] The vibrating support plate 7 is a horizontally set square plate. The four rotating cams 5 abut against the upper surfaces of the four corners of the vibrating support plate 7. During the vibration process, the vibrating support plate 7 can be made to vibrate up and down by activating the four vibration generating motors 4 simultaneously, or the vibrating support plate 7 can be made to vibrate circumferentially by activating the four vibration generating motors 4 in sequence.

[0061] The grading and screening assembly includes a grading and screening cylinder 8, which is a cylindrical cylinder with openings at the top and bottom. The lower end of the grading and screening cylinder 8 is welded to the middle of the upper surface of the vibrating support plate 7.

[0062] The grading and screening cylinder 8 is equipped with a filling counterweight 9. The filling counterweight 9 is a vertically arranged cylindrical block. The lower end of the filling counterweight 9 is fixed on the vibrating support plate 7. The outer peripheral wall of the filling counterweight 9 is closely attached to the inner peripheral wall of the grading and screening cylinder 8.

[0063] Four centrally symmetrical support vertical plates 10 are welded to the side edge of the upper surface of the mounting platform 1. The four support vertical plates 10 are alternately arranged with four motor mounting seats 3.

[0064] The upper ends of the four supporting vertical plates 10 are fixed with horizontal limiting plates 11. A circular limiting port 12 is opened in the middle of the horizontal limiting plate 11. The inner diameter of the circular limiting port 12 is larger than the outer diameter of the grading and screening cylinder 8.

[0065] A rubber sleeve 13 is fixed on the inner circumferential wall of the circular limiting port 12. The circular limiting port 12 and the rubber sleeve 13 can limit the grading screening cylinder 8 during vibration to prevent its amplitude from being too large.

[0066] The pneumatic anti-sticking assembly includes four annular air boxes 14, which are arranged at equal intervals from top to bottom. The outer circumferential wall of each annular air box 14 is fixed on the inner circumferential wall of the grading and screening cylinder 8. The lower surface of the lowest annular air box 14 is closely attached to the upper surface of the filling counterweight block 9.

[0067] Each annular bellows 14 has four centrally symmetrical connecting ports 15 on its inner circumferential wall. Each connecting port 15 has a grid 16 fixed inside it, and the gap between the four sets of grids 16 decreases from top to bottom.

[0068] Four square air ducts 17 are fixed on the outer circumferential wall of the grading and screening cylinder 8, corresponding to the four annular air boxes 14. The square air ducts 17 are connected to the annular air boxes 14 and are arranged in a rotationally symmetrical manner.

[0069] Each square air duct 17 has a closed cover plate 18 fixed at the open end, a discharge pipe 19 connected to the lower surface of the square air duct 17 near the end, and a centrifugal fan 20 connected to the side end face of the square air duct 17 near the end.

[0070] Each square air duct 17 is equipped with a three-way switching valve 21. The three-way switching valve 21 is located between the discharge pipe 19 and the centrifugal fan 20. A switching control module 22 that is electrically connected to the three-way switching valve 21 is fixed on the closed cover plate.

[0071] Each annular bellows 14 has a support ring 23 fixed on its upper surface.

[0072] The grading and screening assembly also includes three flange seats 24, which are rotatably clamped between four annular bellows 14. The lower end of the flange seat 24 is rotatably sleeved on the support ring 23, and the upper surface of the flange seat 24 is rotatably set to be close to the lower surface of the annular bellows 14.

[0073] A transmission gear ring 25 is fixed on the outer peripheral wall of the lower half of each flange seat 24.

[0074] Three transmission boxes 26 are fixed on the circumferential outer wall of the grading and screening cylinder 8, corresponding to three flange seats 24. The transmission boxes 26 are connected to the grading and screening cylinder 8.

[0075] Each transmission box 26 has a transmission motor 27 fixed on its upper surface near the end. The output shaft of the transmission motor 27 passes through the upper wall of the transmission box 26 and is fixed with a transmission gear 28. A transmission chain 29 is sleeved between the transmission gear 28 and the transmission gear ring 25.

[0076] Each flange seat 24 has a screening screen plate 30 fixedly installed in the middle opening, and the mesh size of the three screening screen plates 30 decreases from top to bottom.

[0077] An extended feeding cylinder 31 is fixed at the upper end of the grading and screening cylinder 8. The extended feeding cylinder 31 has openings at the top and bottom. An inclined guide block 32 is fixed on the inner peripheral wall of the grading and screening cylinder 8 near the upper opening. The lower end of the inclined guide block 32 is set close to the upper surface of the uppermost annular air box 14.

[0078] By driving the flange seat 24 to rotate around the central axis by the drive motor 27, the weather-resistant MBS resin powder falling onto the screening screen plate 30 can be uniformly dispersed to avoid accumulation. By starting the centrifugal fan 20 in the forward direction, compressed air can be blown into the annular air box 14 through the square air duct 17, and then into the grading screening cylinder 8 through the connecting port 15, forming a vortex, thereby blowing away the powder accumulated on the screening screen plate 30 and playing a role in preventing sticking and clogging. By starting the centrifugal fan 20 in the reverse direction, powder that meets the particle size can be extracted to achieve graded discharge.

[0079] When using this invention:

[0080] Start the equipment and switch the working mode of the vibration generator motor 4 according to the needs: When starting synchronously, the four vibration generator motors 4 drive the rotating cam 5 to synchronously press the four corners of the vibration support plate 7, and cooperate with the spring vibrator 6 in the positioning sleeve 2 to drive the vibration support plate 7 to perform up and down reciprocating vibration; when starting in sequence, the rotating cam 5 alternately presses the four corners of the vibration support plate 7 to make it perform circumferential reciprocating vibration. The two modes can be adapted to MBS resin powder with different flowability.

[0081] As the core transmission component, the vibrating support plate 7 drives the welding-on grading and screening cylinder 8 above to vibrate synchronously. The filling counterweight 9 inside the cylinder is set close to the cylinder wall, which not only increases the vibration stability of the cylinder, but also prevents powder from getting stuck in the gaps of the cylinder wall. At the same time, the rubber covering sleeve 13 in the circular limiting port 12 can realize the radial limitation of the grading and screening cylinder 8, preventing the cylinder amplitude from being too large or the cylinder from shifting and shaking during vibration, and ensuring that the screening operation is carried out smoothly.

[0082] After the vibration stabilizes, the weather-resistant MBS resin powder is added from the top of the grading and screening cylinder 8 to the extended feeding cylinder 31. After being guided by the inclined guide block 32, the powder falls into the grading and screening cylinder 8 from top to bottom. It is initially loosened by the overall vibration of the cylinder to avoid clumping.

[0083] At this time, the three sets of drive motors 27 of the grading and screening component start synchronously. The drive motors 27 drive the drive gear ring 25 of the outer ring of the flange seat 24 to rotate through the drive gear 28 and the drive chain 29. The three flange seats 24 are respectively clamped between the four annular air boxes 14 and rotate around the central axis of the cylinder with the transmission structure. The three screening screen plates 30 fixed inside also rotate synchronously.

[0084] The rotating sieve plate 30 can evenly spread the falling powder, preventing local accumulation of powder. Combined with the vibration of the cylinder, the powder gradually completes multi-stage sieving: powder with a particle size larger than the aperture of the upper sieve plate 30 is retained on the upper layer; powder with a particle size smaller than the aperture of the upper sieve plate 30 but larger than the aperture of the middle sieve plate 30 falls on the middle sieve plate 30; powder with a particle size smaller than the aperture of the middle sieve plate 30 but larger than the aperture of the lower sieve plate 30 falls on the lower sieve plate; and fine powder with a particle size smaller than the aperture of the bottom sieve plate 30 passes through completely and falls into the area between the bottom annular wind box 14 and the filling counterweight 9, completing multi-stage particle size stratification.

[0085] During the sieving process, if the powder adheres to the screen plate, clogs the mesh, or accumulates inside the cylinder due to its own characteristics, the centrifugal fan 20 of the corresponding level is immediately activated to make it run in the forward direction. The compressed air generated by the centrifugal fan 20 is sent into the corresponding annular air box 14 through the square air duct 17, and then blown out from the grid 16 of the inner ring of the annular air box 14. The airflow forms a vortex in the grading screening cylinder 8, which can not only disperse the powder accumulated on the screening screen plate 30, but also peel off the resin powder adhering to the cylinder wall and the screen surface. With the vibration and the rotation of the screening screen plate 30, the sticking and clogging problem is completely solved, ensuring that the powder passes through the screen smoothly and continuously.

[0086] When the powder on a certain level of the screening screen 30 reaches the preset particle size specification and the collection amount meets the standard, the conversion control module 22 is activated to operate the three-way conversion valve 21 in the square air duct 17 to switch the passage, and at the same time, the cloth bag is put on the discharge pipe 19. At this time, the centrifugal fan 20 starts in reverse to generate suction force, and the qualified powder of this level is discharged in a directional manner from the discharge pipe 19 through the connecting port 15 of the annular air box 14 and the square air duct 17, realizing the precise collection of single-size powder; the three levels can independently control the transmission, air supply and material extraction operations without interfering with each other, and can simultaneously complete the classification and discharge of multi-size powder.

[0087] Throughout the entire operation, the rubber-coated sleeve 13 in the middle of the horizontal limiting plate 11 continuously constrains the amplitude of the grading and screening cylinder 8. The vibration generating component can flexibly switch vibration modes according to the powder screening state. The three major stages of screening, anti-blocking, and grading and discharge are continuously cyclical until all MBS resin powder in the grading and screening cylinder 8 has completed the full grading process. When stopping the machine, first turn off the centrifugal fans 20 and drive motors 27 of each stage, stop the air supply, material extraction, and rotation of the screening screen 30, and then turn off the vibration generating motor 4. The vibrating support plate 7 is smoothly reset under the rebound action of the spring vibrator 6, and the equipment completes the shutdown. The entire workflow takes into account both screening accuracy and anti-blocking efficiency, and is suitable for the grading and processing requirements of weather-resistant MBS resin powder.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A weather-resistant vibrating screen for precise grading and anti-clogging of MBS resin powder, characterized in that: The system includes an installation platform, on which a vibration generating component, a grading and screening component, and a pneumatic anti-sticking component are respectively provided; The vibration generating component includes a positioning sleeve, the lower end of which is welded to the upper surface of the mounting platform, and four sets of centrally symmetrical motor mounting bases are welded to the outer peripheral wall of the positioning sleeve. A vibration generating motor is fixed to the upper surface of the motor mounting base, and a rotating cam is fixed to the end of the output shaft of the vibration generating motor. Several spring vibrators are fixed in the middle of the upper surface of the mounting platform. The spring vibrators are located inside the positioning sleeve, and vibration support plates are fixed at the upper ends of the several spring vibrators. The vibrating support plate is a horizontally arranged square plate, and the four rotating cams abut against the upper surfaces of the four corners of the vibrating support plate; Switch the working mode of the vibration generator motor according to the needs: When starting synchronously, the rotating cam presses against the four corners of the vibration plate, driving the vibration plate to vibrate up and down; when starting sequentially, the rotating cam alternately presses against the four corners of the vibration plate, causing it to vibrate in a circumferential direction. The grading and screening assembly includes a grading and screening cylinder, the lower end of which is welded to the vibrating support plate. The pneumatic anti-sticking assembly includes four annular air boxes arranged equidistantly from top to bottom, and the outer circumferential wall of the annular air boxes is fixed on the inner circumferential wall of the grading and screening cylinder. Each of the annular bellows has a support ring fixed to its upper end face; The grading and screening assembly also includes three flange seats, which are rotatably clamped between the four annular air boxes. The lower end of the flange seat is rotatably sleeved on the support ring, and the upper surface of the flange seat is set in close contact with the lower surface of the annular air box. Each of the flange seats has a sieve plate fixedly installed in the middle opening, and the mesh size of the three sieve plates decreases from top to bottom. Each of the annular bellows has four centrally symmetrical connecting ports on its inner circumferential wall. Each connecting port is fixed with a grid, and the gap between the four sets of grids decreases from top to bottom. Four square air ducts are fixed on the circumferential outer wall of the grading and screening cylinder corresponding to the four annular air boxes. The square air ducts are connected to the annular air boxes and are arranged symmetrically in rotation. Each of the square air ducts has a sealing cover fixed at its open end, a discharge pipe connected to the lower surface of the square air duct near its end is fixed thereto, and a centrifugal fan connected to the side end face of the square air duct near its end is fixed thereto.

2. The weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen according to claim 1, characterized in that: Four centrally symmetrical support vertical plates are welded to the upper surface side edge of the mounting platform, and the four support vertical plates are alternately arranged with the four motor mounting seats; The upper ends of the four supporting vertical plates are fixed with horizontal limiting plates, and the middle of the horizontal limiting plates is provided with a circular limiting opening. The inner diameter of the circular limiting opening is larger than the outer diameter of the grading and screening cylinder. A rubber sleeve is fixed on the inner peripheral wall of the circular limiting port.

3. The weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen according to claim 1, characterized in that: The grading and screening cylinder is equipped with a filling counterweight. The lower end of the filling counterweight is fixed to the vibrating support plate. The outer peripheral wall of the filling counterweight is closely attached to the inner peripheral wall of the grading and screening cylinder. The lower surface of the annular wind box at the bottom is closely attached to the upper surface of the filling counterweight.

4. The weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen according to claim 1, characterized in that: Each of the square air ducts is equipped with a three-way switching valve, which is located between the discharge pipe and the centrifugal fan. A switching control module electrically connected to the three-way switching valve is fixed on the closed cover plate.

5. The weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen according to claim 1, characterized in that: A transmission gear ring is fixed on the outer peripheral wall of the lower half of each flange seat; Three transmission boxes are fixed on the circumferential outer wall of the grading and screening cylinder, corresponding to the three flange seats respectively, and the transmission boxes are connected to the grading and screening cylinder. Each of the transmission boxes has a transmission motor fixed on its upper surface near the end. The output shaft of the transmission motor passes through the upper wall of the transmission box and is fixed with a transmission gear. A transmission chain is sleeved between the transmission gear and the transmission ring.

6. The weather-resistant MBS resin powder precision grading and anti-clogging vibrating screen according to claim 1, characterized in that: An extended feeding cylinder is fixed to the upper end of the grading and screening cylinder. The extended feeding cylinder has openings at the top and bottom. An inclined guide block is fixed on the inner peripheral wall of the grading and screening cylinder near the upper opening. The lower end of the inclined guide block is close to the upper surface of the uppermost annular air box.

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