Classified screening device for PVC (polyvinyl chloride) color master batches

Abstract

The utility model provides a PVC (Polyvinyl Chloride) color master batch grading and screening device, which belongs to the technical field of PVC color master batch production equipment and comprises a box body, the short stand column is rotationally connected to the side end of the box body; the long stand column is rotationally connected to the side end of the box body; the rotating column is rotationally connected to the side end of the box body; the screening cylinder is fixedly connected to the side end of the rotating column, and a first screening opening, a second screening opening and a third screening opening are formed in the circumferential surface of the rotating column; the sealing plates are fixedly connected to the left end and the right end of the screening cylinder, arc-shaped stirring blades are fixedly connected to the side ends of the sealing plates, a first screening opening, a second screening opening and a third screening opening are formed in the circumferential surface of the screening cylinder, and PVC color master batches with different particle size ranges can be screened at the same time; in the rotating process of the screening cylinder, PVC color master batches can be rapidly classified and screened through different screening openings under the combined action of centrifugal force and gravity.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PVC color master batch production equipment technical field, specifically related to a PVC color master batch grading screening device. BACKGROUND

[0002] In the production process of PVC color master batch, due to the influence of production process and raw materials and other factors, the particle size of the produced color master batch often has certain differences. Different particle size color master batch may be different in application performance and product quality, for example, in the coloring process of plastic products, the color master batch with uniform particle size can be more evenly dispersed in the plastic matrix, making the color of the product more uniform and stable. The color master batch with uneven particle size may lead to poor coloring effect, color difference, spot and other problems, affecting the quality and appearance of the product.

[0003] Therefore, in order to ensure the product quality of PVC color master batch, it is necessary to grade and screen the produced color master batch, separate the color master batch in different particle size range, so as to be classified and used or further processed according to different application requirements.

[0004] The traditional PVC color master batch grading and screening method mainly adopts manual screening or simple mechanical screen mesh screening. The manual screening method is low in efficiency, high in labor intensity, and the screening accuracy is difficult to guarantee, which cannot meet the demand of large-scale production. Although the simple mechanical screen mesh screening improves the screening efficiency to some extent, it has problems such as uneven screening, easy to block the screen mesh, which affects the screening effect and production efficiency.

[0005] In addition, some existing grading and screening devices have some deficiencies in structure design, for example, the flow of materials in the screening process is uneven, resulting in accumulation or insufficient screening of materials in some areas. The stability of the equipment is poor, and vibration and shaking are easy to occur during high-speed rotation screening, which affects the service life and screening accuracy of the equipment. Moreover, the feeding and discharging structure of some devices is not reasonable, which makes the material adding and collecting inconvenient, increases the labor intensity of the operators. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a PVC color master batch grading and screening device, which aims at solving the problems of low efficiency, poor accuracy, unstable equipment operation, uneven material flow, inconvenient feeding and discharging and large operation labor intensity in the prior art.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A PVC color master batch grading and screening device, comprising:

[0009] A box body;

[0010] A short column, which is rotatably connected to the side end of the housing;

[0011] A long column, which is rotatably connected to the side end of the housing;

[0012] A rotating column, which is rotatably connected to the side end of the housing;

[0013] A screening cylinder is fixedly connected to the side end of a rotating column, and the circumferential surface of the rotating column is provided with a first screening port, a second screening port and a third screening port;

[0014] A sealing plate is fixedly connected to the left and right ends of the screening cylinder, and an arc-shaped stirring blade is fixedly connected to the side end of the sealing plate.

[0015] A drive mechanism is provided at the side of the housing to rotate the screening cylinder for screening.

[0016] In a preferred embodiment of this utility model, the drive mechanism includes a first gear, a motor, a second gear, and a chain. The first gear is fixedly connected to the side end of the rotating column, the motor is fixedly connected to the side end of the housing, the second gear is fixedly connected to the output end of the motor, and the chain is meshed and rotatably connected between the first gear and the second gear.

[0017] As a preferred embodiment of this utility model, a short column is fixedly connected to the lower left side of the box body, and a long column is fixedly connected to the lower right side of the box body.

[0018] In a preferred embodiment of this utility model, a lower frame is fixedly connected to the lower end of the box body, a discharge hopper is fixedly connected to the lower end of the lower frame, and a partition is fixedly connected to the side end of the lower frame.

[0019] As a preferred embodiment of this utility model, the upper end of the box is fixedly connected to an upper frame, and a feed hopper is snapped onto the upper frame.

[0020] As a preferred embodiment of this utility model, the upper end of the box is rotatably connected to a cover plate via a rotating shaft, and windows are provided on the circumferential surface of the screening cylinder and on the first screening port, the second screening port and the third screening port via a rotating shaft.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. In this design, the circumferential surface of the screening cylinder is equipped with a first screening port, a second screening port, and a third screening port, enabling simultaneous screening of PVC masterbatches with different particle sizes. During the rotation of the screening cylinder, the PVC masterbatches, under the combined action of centrifugal force and gravity, can be rapidly classified and screened through the different screening ports. Compared to traditional single screening ports or simple screening methods, this significantly improves screening efficiency, allowing for the processing of large quantities of PVC masterbatches in a shorter time, meeting the needs of large-scale production. The arc-shaped stirring blades on the closed plate rotate with the screening cylinder, stirring and agitating the PVC masterbatches inside. This ensures a more uniform distribution of material during screening, preventing material accumulation or blockage at the screening ports and guaranteeing the continuity and stability of the screening process. Simultaneously, the stirring blades also make it easier for PVC masterbatches near the screening cylinder wall to approach the screening ports, further improving screening efficiency and ensuring that PVC masterbatches of different particle sizes can accurately pass through the corresponding screening ports, achieving precise classification.

[0023] 2. In this design, the short and long columns are rotatably connected to the sides of the housing, forming a stable support system that provides reliable support for the rotating columns and screening cylinders. The lower frame further reinforces the lower end of the housing, making the entire device more stable during operation and reducing equipment failures and screening errors caused by vibration or shaking. Even when processing large quantities of PVC masterbatch or operating continuously for extended periods, the device maintains good operating conditions, extending its service life. A cover plate is rotatably connected to the upper end of the housing via a rotating shaft, allowing operators to easily open the cover to observe the operation of the screening cylinders inside the housing, promptly identify material blockages, equipment malfunctions, and take appropriate action. Furthermore, the windows on the circumferential surface of the screening cylinders, set via the rotating shaft, not only aid in material screening but also facilitate cleaning and maintenance of the screening ports and surrounding areas after equipment shutdown. This user-friendly design reduces the difficulty of equipment maintenance and improves production efficiency. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a first-view perspective perspective view of the present invention;

[0026] Figure 2 This is a second-view perspective perspective view of the present invention;

[0027] Figure 3 This is an exploded view of the present invention;

[0028] Figure 4 This utility modelFigure 2 Exploded view of the middle box section.

[0029] In the diagram: 1. Box body; 2. Short column; 3. Long column; 4. Rotating column; 5. Screening cylinder; 6. First screening port; 7. Second screening port; 8. Third screening port; 9. Sealing plate; 10. Arc-shaped stirring blade; 11. First gear; 12. Motor; 13. Second gear; 14. Chain; 15. Upper frame; 16. Feed hopper; 17. Cover plate; 18. Lower frame; 19. Discharge hopper; 20. Partition plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] Please see Figures 1-4 The present invention provides the following technical solution:

[0033] A PVC masterbatch grading and screening device, comprising:

[0034] Box 1;

[0035] Short column 2 is rotatably connected to the side end of box 1;

[0036] Long column 3, which is rotatably connected to the side end of box 1;

[0037] Rotating column 4 is rotatably connected to the side end of housing 1;

[0038] The screening cylinder 5 is fixedly connected to the side end of the rotating column 4. The circumferential surface of the rotating column 4 is provided with a first screening port 6, a second screening port 7 and a third screening port 8.

[0039] The sealing plate 9 is fixedly connected to the left and right ends of the screening cylinder 5, and the side end of the sealing plate 9 is fixedly connected to the arc-shaped stirring blade 10.

[0040] The drive mechanism is located on the side of the housing 1 to rotate the screening cylinder 5 to achieve screening.

[0041] In a specific embodiment of this utility model, the housing 1 serves as the main structure of the entire PVC masterbatch grading and screening device, providing space for the installation and operation of other components such as the rotating column 4 and the screening cylinder 5, while also protecting the internal components from external environmental interference. It provides stable support for the short columns 2 and long columns 3, ensuring the stability of the entire device during operation and preventing the screening effect from being affected by shaking or tilting. The short columns 2 and long columns 3 are rotatably connected to the side ends of the housing 1, forming a support system together with the housing 1. This helps to fix the position of the rotating column 4, ensuring its stability during rotation, thereby ensuring that the screening cylinder 5 can rotate and screen according to a predetermined trajectory and method. The rotating column 4, in cooperation with the drive mechanism, achieves rotational movement under the drive of power. Simultaneously, the rotating column 4 provides support and connection for the screening cylinder 5, transmitting power to the screening cylinder 5 and causing it to rotate together. The positions and sizes of the first screening port 6, the second screening port 7, and the third screening port 8 on the rotating column 4 are carefully designed according to the grading and screening requirements of PVC masterbatch. During rotation, these screening ports can form a specific relative position with the space inside the housing 1, allowing PVC masterbatches of different particle sizes to pass through the corresponding screening ports in a predetermined order and direction, achieving the purpose of grading and screening. The screening cylinder 5 is fixedly connected to the side end of the rotating column 4, forming a closed or semi-closed screening space to accommodate the PVC masterbatches to be screened. Driven by the rotating column 4, the screening cylinder 5 rotates, causing the PVC masterbatches inside to continuously pass through the first screening port 6, the second screening port 7, and the third screening port 8 under the combined action of centrifugal force and gravity, thereby achieving the function of grading and screening according to particle size. The sealing plate 9 seals both ends of the screening cylinder 5 to prevent PVC masterbatches from leaking out from both ends during the rotational screening process, ensuring the continuity and stability of the screening process. During the rotation of the screening cylinder 5, the arc-shaped stirring blade 10 rotates together with the sealing plate 9. The special shape and angle design of the arc-shaped stirring blade 10 can generate a certain stirring and tumbling effect on the PVC masterbatch, making the material more evenly distributed inside the screening cylinder 5, avoiding local accumulation or blockage, thereby improving the consistency and stability of the screening effect. During rotation, the arc-shaped stirring blade 10 can also apply a certain pushing force to the PVC masterbatch near the wall of the screening cylinder 5, making it easier for it to approach the screening opening, which helps to improve screening efficiency, especially for some PVC masterbatch with particle sizes close to the screening opening size, enabling better separation. The drive mechanism is located at the side end of the housing 1 and is the power source for the entire PVC masterbatch grading and screening device.

[0042] Please refer to the details. Figures 1-4The drive mechanism includes a first gear 11, a motor 12, a second gear 13, and a chain 14. The first gear 11 is fixedly connected to the side end of the rotating column 4, the motor 12 is fixedly connected to the side end of the housing 1, the second gear 13 is fixedly connected to the output end of the motor 12, and the chain 14 is meshed and rotatably connected between the first gear 11 and the second gear 13.

[0043] In this embodiment: the first gear 11 transmits the power from the motor 12 to the rotating column 4. Due to the stable transmission ratio and high transmission efficiency of gear transmission, the first gear 11 can accurately transmit power from the second gear 13 to the rotating column 4 according to a certain transmission ratio, thereby driving the screening cylinder 5 to rotate at a predetermined speed and direction, ensuring the stability and accuracy of the PVC masterbatch grading and screening process. Its tooth count, module, and other parameters are matched with the second gear 13 at the output end of the motor 12. By rationally designing the transmission ratio of the first gear 11 and the second gear 13, the rotation speed of the screening cylinder 5 can be precisely controlled to meet the grading and screening requirements of PVC masterbatch with different particle size ranges. The motor 12 converts electrical energy into mechanical energy, providing continuous and stable power for the rotation of the screening cylinder 5. The second gear 13 transmits the power generated by the motor 12 to the chain 14 through its own rotation. This efficiently transmits the power of the motor 12 to the first gear 11, thereby driving the rotating column 4 and the screening cylinder 5 to rotate. The chain 14 meshes and rotates between the first gear 11 and the second gear 13, serving to transmit power. Since the motor 12 is usually installed on the side of the housing 1, and the rotating column 4 is located inside the housing and at a certain distance from the motor, the chain 14 can transmit the power of the motor 12 from the second gear 13 to the first gear 11 without changing the power transmission direction, thus realizing long-distance power transmission. This allows the drive mechanism to be reasonably arranged in different positions of the device, optimizing the structural design of the entire equipment.

[0044] Please refer to the details. Figures 1-4 A short column 2 is fixedly connected to the lower left side of the box body 1, and a long column 3 is fixedly connected to the lower right side of the box body 1.

[0045] In this embodiment: the lower left side of the housing 1 provides support, sharing the weight of the housing 1 and its internal materials, reducing the burden on other supporting structures such as the long column 3 and the lower frame 18, ensuring the stability of the entire device during operation, and preventing the housing 1 from tilting or shaking due to uneven force, which would affect the grading and screening effect of PVC masterbatch. The long column 3 and the short column 2 jointly bear the weight of the housing 1, providing support to the lower right side of the housing 1, further enhancing the stability of the entire device. Especially when processing large quantities of PVC masterbatch or when the equipment experiences significant vibration during operation, the long column 3 and the short column 2 work together to effectively prevent the housing 1 from shifting or deforming, ensuring the normal operation of key components such as the screening cylinder 5.

[0046] Please refer to the details. Figures 1-4 The lower end of the box 1 is fixedly connected to the lower frame 18, the lower end of the lower frame 18 is fixedly connected to the discharge hopper 19, and the side end of the lower frame 18 is fixedly connected to the partition 20.

[0047] In this embodiment: the lower frame 18 supports the housing 1, distributing the weight of the housing 1 and its internal components, reducing the load on the short columns 2 and long columns 3, and enhancing the stability of the entire device. By distributing the weight of the housing 1 more evenly on the ground or other supporting surfaces, it prevents the device from swaying or tilting during operation due to an unstable center of gravity, ensuring the smooth progress of the PVC masterbatch grading and screening process. As the connecting hub between the housing 1 and other components such as the discharge hopper 19 and the partition 20, it integrates all components to form a complete structural system. It not only bears the downward vertical gravity from the housing 1 but also transmits and disperses the forces generated by other components during operation, ensuring the reliability and durability of the entire device. The discharge hopper 19, located at the lower end of the lower frame 18, is used to collect the PVC masterbatch after grading and screening. When the screening cylinder 5 rotates under the drive mechanism, PVC masterbatches of different particle sizes fall into the discharge hopper 19 through the corresponding screening ports. The discharge hopper 19 collects these materials and guides them out of the device in a predetermined direction, facilitating subsequent packaging, storage, or further processing. The special shape and structural design of the discharge hopper 19 effectively prevents PVC masterbatches from splashing or spilling during the discharge process. It typically has a gradually narrowing outlet and a suitable tilt angle, allowing the material to flow out smoothly under gravity, preventing it from scattering, maintaining a clean working environment, and reducing material waste. The partition 20 is used to separate different areas or guide the flow direction of the material. In the PVC masterbatch grading and screening device, the partition 20 can separate the different outlet areas of the discharge hopper 19, allowing PVC masterbatches of different particle sizes to be discharged from different outlets after grading and screening, facilitating subsequent classification, collection, and processing. The partition 20 also prevents PVC masterbatches of different particle sizes from mixing during the discharge process, ensuring the effectiveness of the grading and screening. By properly setting the position and shape of the baffle 20, materials of different particle sizes can flow smoothly out of their respective channels, avoiding inaccurate grading caused by mutual collision or interference, and improving product quality and consistency.

[0048] Please refer to the details. Figures 1-4 The upper end of the box 1 is fixedly connected to the upper frame 15, and the upper frame 15 is clamped to the feed hopper 16.

[0049] In this embodiment: the upper frame 15 provides a stable support structure for the feed hopper 16. It can withstand the weight of the feed hopper 16 and the PVC masterbatch poured into it, ensuring that the feed hopper 16 maintains a fixed position during operation and will not shake or shift due to the weight or impact of the material, thus guaranteeing the stability and accuracy of the feeding process. As a connecting component between the housing 1 and the feed hopper 16, the upper frame 15 enhances the overall structural integrity of the entire device. It organically combines the feed hopper 16 with the housing 1, allowing the material to smoothly enter the screening cylinder 5 inside the housing 1 for grading and screening from the feed hopper 16. It also makes the overall appearance of the device more regular, facilitating installation, maintenance, and operation. The feed hopper 16, snapped onto the upper frame 15, is the inlet for the PVC masterbatch to enter the grading and screening device. Its shape and size design facilitates the operator's pouring of the PVC masterbatch into it, and guides the material smoothly into the housing 1 during the pouring process. The feed hopper 16 typically has a large opening and a suitable tilt angle, facilitating material addition while reducing spillage and splashing during the pouring process. To a certain extent, it controls and buffers the flow rate of material entering the housing 1. When a large amount of PVC masterbatch is rapidly poured into the feed hopper 16, the space within the hopper 16 can temporarily accommodate a portion of the material, preventing it from impacting the screening cylinder 5 too quickly. This protects the screening cylinder 5 and other related components from excessive impact, extending the equipment's service life. Furthermore, by rationally designing the outlet size and shape of the feed hopper 16, the material flow rate can be adjusted to match the processing capacity of the screening cylinder 5, ensuring the smooth operation of the grading and screening process.

[0050] Please refer to the details. Figures 1-4 The upper end of the housing 1 is rotatably connected to the cover plate 17 via a rotating shaft. The circumferential surface of the screening cylinder 5 and the first screening port 6, the second screening port 7 and the third screening port 8 are all provided with windows via rotating shafts.

[0051] In this embodiment, the cover plate 17 is rotatably connected to the upper end of the housing 1 via a rotating shaft, allowing the upper opening of the housing 1 to be closed when needed. This prevents external dust and impurities from entering the housing 1 during the PVC masterbatch grading and screening process, thus contaminating the PVC masterbatch being screened and ensuring product purity and quality. It also prevents operators from accidentally contacting internal rotating parts during equipment operation, improving operational safety. The cover plate 17 can be flexibly opened or closed around the rotating shaft, providing operators with a convenient way to observe the screening process inside the housing 1. During production, operators can open the cover plate 17 to visually observe the movement of the PVC masterbatch within the screening cylinder 5 and the screening effect, allowing for timely identification and adjustment of potential problems. Furthermore, opening the cover plate 17 facilitates operation and maintenance of internal components when the equipment requires repair or maintenance. The first screening port 6, the second screening port 7, and the third screening port 8 are located on the circumferential surface of the screening cylinder 5 and connected to the screening cylinder 5 via a rotating shaft. These windows assist in material screening during the screening process. As the screening cylinder 5 rotates, the changing position and angle of the window allow materials to pass through the screening port more smoothly, preventing material accumulation or blockage and improving screening efficiency. The window also allows operators to observe the material screening process from the outside, monitoring its progress in real time. If blockage or other abnormalities are detected, timely intervention is possible. Furthermore, after the equipment stops, opening the window facilitates cleaning of the screening port and surrounding area, removing residual PVC masterbatch or other debris, ensuring the equipment remains clean and operates normally.

[0052] The working principle and usage process of this utility model are as follows: First, turn on the power switch of motor 12, and slowly pour the PVC masterbatch to be graded and screened into the feed hopper 16. Care should be taken to control the feeding speed to avoid the material being poured in too quickly, causing the feed hopper 16 to overflow or creating excessive impact on the screening cylinder 5. The feeding speed can be adjusted reasonably according to the equipment's processing capacity and actual production needs. After confirming that the feeding is normal, start the drive mechanism. Motor 12 will start running, driving the rotating column 4 and screening cylinder 5 to rotate through the transmission action of the first gear 11, the second gear 13, and the chain 14. The rotation speed of the screening cylinder 5 should be determined according to the particle size of the PVC masterbatch. The scope and screening requirements are adjusted to achieve the best grading and screening effect. As the screening cylinder 5 rotates, the PVC masterbatch inside, under the combined action of centrifugal force and gravity, begins to be graded and screened through the first screening port 6, the second screening port 7, and the third screening port 8. PVC masterbatch of different particle sizes will fall into the collection area below from the corresponding screening ports. During the screening process, the arc-shaped stirring blade 10 on the closed plate 9 will stir and agitate the material as the screening cylinder 5 rotates, making the material distribution more uniform, avoiding material accumulation or blockage at the screening ports, and improving screening efficiency. After grading and screening, PVC masterbatch of different particle sizes... The masterbatch will fall into the discharge hopper 19 and be guided by the baffle 20 to exit from different outlets. Operators can set up collection containers at the corresponding outlet positions of the discharge hopper 19 to collect PVC masterbatch of different particle sizes. When collecting materials, care should be taken to avoid spillage and maintain a clean working environment. The collection containers can be marked as needed to distinguish materials of different particle sizes. After collecting a certain amount of material, operators can sample and inspect the screened PVC masterbatch to observe whether the material in different collection containers meets the expected particle size range. If the screening effect is found to be unsatisfactory, for example, if some particles are present... If the particle size of the material does not meet the requirements or the screening is incomplete, the machine should be stopped immediately for inspection. Adjust the rotation speed of the screening cylinder 5, the size of the screening port, or other relevant parameters until a satisfactory screening effect is achieved. After a batch of PVC masterbatch is screened, stop adding material to the feed hopper 16. After the material in the screening cylinder 5 has been basically processed, turn off the motor 12 of the drive mechanism to stop the rotation of the screening cylinder 5. Open the cover plate 17 again and clean the residual PVC masterbatch and debris inside the screening cylinder 5. Use appropriate tools to clean the material adhering to the cylinder wall and near the screening port to ensure that the inside of the equipment is clean.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A PVC masterbatch grading and screening device, characterized in that, include: Box (1); Short column (2), which is rotatably connected to the side end of the box body (1); Long column (3), which is rotatably connected to the side end of the box body (1); Rotating column (4), which is rotatably connected to the side end of the housing (1); A screening cylinder (5) is fixedly connected to the side end of a rotating column (4). The rotating column (4) has a first screening port (6), a second screening port (7) and a third screening port (8) on its circumferential surface. A sealing plate (9) is fixedly connected to the left and right ends of the screening cylinder (5), and an arc-shaped stirring blade (10) is fixedly connected to the side end of the sealing plate (9). A drive mechanism is provided at the side end of the housing (1) to achieve the rotation of the screening cylinder (5) for screening.

2. The PVC masterbatch grading and screening device according to claim 1, characterized in that: The drive mechanism includes a first gear (11), a motor (12), a second gear (13), and a chain (14). The first gear (11) is fixedly connected to the side end of the rotating column (4), the motor (12) is fixedly connected to the side end of the housing (1), the second gear (13) is fixedly connected to the output end of the motor (12), and the chain (14) is meshed and rotatably connected between the first gear (11) and the second gear (13).

3. The PVC masterbatch grading and screening device according to claim 2, characterized in that: A short column (2) is fixedly connected to the lower left side of the box (1), and a long column (3) is fixedly connected to the lower right side of the box (1).

4. The PVC masterbatch grading and screening device according to claim 3, characterized in that: The lower end of the box (1) is fixedly connected to a lower frame (18), the lower end of the lower frame (18) is fixedly connected to a discharge hopper (19), and the side end of the lower frame (18) is fixedly connected to a partition (20).

5. A PVC masterbatch grading and screening device according to claim 4, characterized in that: The upper end of the box (1) is fixedly connected to the upper frame (15), and the upper frame (15) is fitted with a feed hopper (16).

6. The PVC masterbatch grading and screening device according to claim 5, characterized in that: The upper end of the box (1) is rotatably connected to a cover plate (17) via a rotating shaft. The circumferential surface of the screening cylinder (5) and the first screening port (6), the second screening port (7) and the third screening port (8) are all provided with windows via rotating shafts.

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