Linear vibration screen for plastic particles

Abstract

The application relates to the field of material screening, in particular to a plastic particle linear vibration screen, which comprises a base, a damping part, a screen box, a vibration driving part and a screen mesh with a plurality of screen holes, the damping part is arranged between the base and the screen box, the vibration driving part is arranged on the screen box, the screen mesh is installed on the screen box and located directly above the screen box, the screen mesh is divided into a fine particle screening area, a coarse particle screening area and an oversized particle screening area, is used for screening fine particle rubber particles, coarse particle rubber particles and oversized particle rubber particles, the screen box is correspondingly provided with a fine particle discharging area, a coarse particle discharging area and an oversized particle discharging area, a cleaning device is arranged at the bottom of the screen mesh, the cleaning device comprises a cleaning brush head slidingly arranged on the screen mesh, the cleaning brush head reciprocally slides between a screen mesh feeding end and a screen mesh discharging end, and is used for cleaning the rubber particles clamped at the bottom of the screen mesh. The structure can realize the simultaneous screening of plastic particles of different specifications by the vibration screen, can conveniently solve the problem of screen mesh blockage, and thus improves the screening efficiency of the vibration screen.

Description

Technical Field

[0001] This application relates to the field of material screening, and in particular to a linear vibrating screen for plastic granules. Background Technology

[0002] In modern industrial production systems, precise material screening is crucial, directly impacting product quality and production efficiency. Vibrating screens, as important screening equipment, have become indispensable tools in numerous industries after long-term development. In industries such as metallurgy, building materials, plastics, and chemicals, vibrating screens play an irreplaceable role, streamlining production processes, stabilizing product quality, and powerfully driving the development of these industries towards automation and large-scale production. Linear vibrating screens, a common type of vibrating screen, are widely used, especially in specific industries such as plastic granule screening, due to their significant advantages such as large processing capacity and high screening accuracy, providing crucial support for the production of plastic products. For plastic granule screening, vibrating screens on the market typically consist of core components such as a screen box, vibrating motor, damping springs, screen mesh, inlet / outlet ports, and base, exhibiting a compact structure and clearly defined functions. The main principle is as follows: the vibrating motor generates horizontally canceling and vertically superimposed excitation forces through the rotation of the eccentric block, driving the screen box to reciprocate linearly. This causes the material to stratify on the screen and pass through (fine particles fall) or move along the screen surface (coarse particles are discharged). By adjusting the vibration parameters, the screening efficiency and accuracy can be optimized. Some manufacturers use single-layer vibrating screens for screening. This screening method is relatively simple to operate. It mainly utilizes the vibration of the screen to make the plastic particles move under the combined action of gravity and vibration, thereby initially separating plastic particles with large size differences. Other companies use multi-layer screen combinations, increasing the number of screen layers to extend the residence time of plastic particles on the screen, thus improving the screening effect through layer-by-layer screening. Although these screening methods achieve the screening of plastic particles to a certain extent, there are still many obvious defects in practical applications. The shortcomings of existing linear vibrating screens are as follows: Firstly, the screening function of a single-layer screen is relatively limited, only able to screen out granules that meet a specific specification. For the large amounts of plastic powder and excessively small granules generated during factory production, there is a lack of effective screening methods, failing to meet diverse screening needs. Secondly, multi-layer screens frequently experience granule clogging problems, with granules easily getting stuck in the screen holes. Existing multi-layer vibrating screens require manual removal and cleaning of each layer. This is not only cumbersome and time-consuming, but also necessitates machine shutdown during cleaning, causing the vibrating screen to malfunction, significantly reducing screening efficiency and increasing production costs. Utility Model Content

[0003] In order to enable the vibrating screen to simultaneously screen plastic granules of different specifications, and to conveniently solve the problem of screen clogging without stopping the machine to clean the screen blocked by plastic granules, thereby improving the screening efficiency of the vibrating screen, this application provides a linear vibrating screen for plastic granules.

[0004] This application provides a linear vibrating screen for plastic granules, including a base, a shock absorber, a screen box, a vibration drive, and a screen with several screen holes. The shock absorber is disposed between the base and the screen box, the vibration drive is disposed in the screen box, and the screen is installed in the screen box and located directly above it. The screen is divided into a fine particle screening zone, a coarse particle screening zone, and an extra-large particle screening zone for screening out fine, coarse, and extra-large plastic granules. The screen box is correspondingly provided with a fine particle feeding zone, a coarse particle feeding zone, and an extra-large particle feeding zone. A cleaning device is provided at the bottom of the screen, including a cleaning brush head slidably disposed on the screen. The cleaning brush head reciprocates between the screen's feed end and the screen's discharge end to push out plastic granules stuck at the bottom of the screen. By adopting the above technical solution, dividing the screen into fine particle screening zones, coarse particle screening zones, and extra-large particle screening zones, plastic granules can be classified and screened according to different sizes. When the vibrating drive unit drives the screen box in a linear reciprocating motion, the plastic granules are slowly conveyed along the screen from the feed end to the discharge end. Different sized granules, depending on the size and position of the screen holes, enter the corresponding fine particle feeding zone, coarse particle feeding zone, and extra-large particle feeding zone, achieving diversified screening needs. This is more powerful than existing single-layer screens that can only screen a single size of granules. Simultaneously, a cleaning device is installed at the bottom of the screen. The cleaning brush head can slide back and forth between the feed and discharge ends of the screen, promptly cleaning granules stuck at the bottom of the screen during operation. These granules are pushed onto the screen for secondary screening, solving the problem of granule clogging the screen holes and reducing screening efficiency. It eliminates the need for manual removal of the screen for cleaning, reducing downtime, improving screening efficiency, lowering production costs, and simultaneously improving the accuracy of granule screening. Preferably, the cleaning device further includes a sliding mechanism for driving the cleaning brush head to slide back and forth. The sliding mechanism includes slide rails disposed on both sides of the screen, a slider that slides with the slide rails, and a cleaning drive component that drives the slider to move. The cleaning drive component is disposed on the screen, and both sides of the cleaning brush head are respectively connected to the slider. By adopting the above technical solution, slide rails are disposed on both sides of the screen, the slider slides with the slide rails, the cleaning drive component is disposed on the screen and drives the slider to move, and both sides of the cleaning brush head are connected to the slider. Thus, the cleaning drive component can drive the slider to move on the slide rails, thereby driving the cleaning brush head to slide back and forth between the feed end and the discharge end of the screen. In this way, the adhesive particles stuck at the bottom of the screen can be cleaned in a timely and effective manner, avoiding the adhesive particles from clogging the screen holes and affecting the screening effect. The continuous cleaning process ensures the permeability of the screen, making the screening process of plastic granules on the screen smoother, thereby improving the overall screening efficiency and accuracy of the linear vibrating screen for plastic granules, ensuring the continuity and stability of production, reducing downtime caused by cleaning the screen, and lowering production costs.Preferably, the cleaning brush head is provided with flexible bristle ends, which abut against the bottom of the screen. By adopting the above technical solution, the cleaning brush head is provided with flexible bristle ends and abuts against the bottom of the screen. The flexible bristles are soft and can effectively conform to the contour of the bottom of the screen without damaging it when the cleaning brush head slides back and forth to clean the bottom of the screen. When encountering plastic particles stuck at the bottom of the screen, the flexible bristles can penetrate into the vicinity of the screen holes and deform appropriately due to their own flexibility, more comprehensively wrapping and touching the plastic particles, pushing the stuck plastic particles onto the screen for secondary screening. This avoids the problem of reduced screening efficiency caused by plastic particles clogging the screen holes, making the passage and movement of plastic particles on the screen smoother, and further ensuring the continuous and efficient operation of the linear vibrating screen for plastic particles. Preferably, the screen is detachably installed in the screen box. By adopting the above technical solution, the screen can be detachably installed in the screen box. When the screen is damaged, it is not necessary to replace or repair the entire vibrating screen; only the screen needs to be removed from the screen box for individual replacement or repair. This reduces maintenance costs and shortens maintenance time, avoiding prolonged downtime of the vibrating screen due to screen problems and improving the efficiency of the vibrating screen. Simultaneously, when screening different sizes of plastic particles, screens with different mesh sizes can be easily replaced according to specific needs, enabling the vibrating screen to adapt to diverse screening tasks and enhancing its applicability and flexibility. Preferably, the mesh diameter in the fine particle screening zone is smaller than that in the coarse particle screening zone, and the extra-large particle screening zone of the screen is equipped with an extra-large particle discharge port. By adopting the above technical solution, the screen aperture diameter in the fine particle screening zone is smaller than that in the coarse particle screening zone. During vibrating screen operation, smaller fine particles can pass smoothly through the screen apertures in the fine particle screening zone and fall into the corresponding fine particle feeding zone. Slightly larger coarse particles, unable to pass through the screen apertures in the fine particle screening zone, continue to move towards the coarse particle screening zone on the screen, eventually falling into the corresponding coarse particle feeding zone. This effectively separates and screens fine and coarse particles. Simultaneously, the screen's extra-large particle screening zone is equipped with an extra-large particle discharge port. Extra-large particles, much larger than coarse particles, are discharged through this port after reaching the extra-large particle screening zone, preventing accumulation at the discharge end. This further improves the vibrating screen's grading and screening function for particles of different sizes, increasing screening efficiency and accuracy to meet diverse screening needs. Preferably, the screen's feed end is equipped with a feed hopper. By adopting the above technical solution, a feeding hopper is set at the feeding end of the screen. The feeding hopper can receive plastic granules and prevent the plastic granules from scattering randomly during feeding.When plastic granules are fed into the hopper, the hopper guides them into the screen in an orderly manner, allowing them to fall more concentratedly and evenly onto the screen. Compared to the situation without a hopper, where the plastic granules may be randomly distributed on the screen, this improves the efficiency and accuracy of subsequent screening, reduces screening errors caused by uneven particle distribution, and ultimately enhances the screening effect and quality of the entire linear vibrating screen for plastic granules. Preferably, the screen is equipped with guide components, including a guide rod near the hopper and guide plates symmetrically installed on both sides of the guide rod. The two guide plates are located between the guide rod and the screen, forming a trapezoidal channel with the guide rod, so that the plastic granules passing through the trapezoidal channel are dispersed on the screen. By adopting the above technical solution, the screen is equipped with guide components, and the guide rod and the guide plates symmetrically installed on both sides of the guide components form a trapezoidal channel. When the plastic granules enter the screen from the hopper, the shape of the trapezoidal channel guides the plastic granules to disperse to both sides. Because the trapezoidal channel is narrower at the top and wider at the bottom, the colloidal particles are guided by the channel walls as they pass through, causing the initially concentrated particles to gradually diffuse over a wider area. This disperses the particles across the screen, preventing excessive accumulation in localized areas. This dispersed distribution allows each particle to make more thorough contact with the screen, increasing the chance of particle passage and thus improving screening efficiency. It also helps to improve screening accuracy, enabling more precise separation of particles of different sizes. Preferably, the screen box is provided with a partition plate, a coarse particle feeding plate, and an extra-large particle feeding plate. The partition plate is located between the fine particle feeding area and the coarse particle feeding area. The coarse particle feeding plate extends from the discharge end of the screen box, so that after the colloid particles fall from the coarse particle screening area of ​​the screen to the coarse particle feeding area of ​​the screen box, they are screened out by the coarse particle feeding plate. The extra-large particle feeding plate is located between the screen and the screen box, corresponding to the extra-large particle discharge port, so that the colloid particles fall from the extra-large particle discharge port to the coarse particle feeding plate and are screened out. By adopting the above technical solution, the partition plate in the screen box, located between the fine particle feeding area and the coarse particle feeding area, can effectively prevent fine and coarse colloid particles from mixing during the feeding process, because the partition plate plays a physical isolation role, preventing the two types of colloid particles of different sizes from moving and mixing together during the falling process. A coarse particle discharge plate is extended at the discharge end of the screen box. When the granules fall from the coarse screening area of ​​the screen to the coarse discharge area of ​​the screen box, the coarse particle discharge plate can guide these granules to be screened out in an orderly manner. Compared with the case without the coarse particle discharge plate, the granules are less likely to accumulate in the screen box and can be discharged more smoothly.The extra-large particle feeding plate is positioned between the screen and the screen box, corresponding to the extra-large particle discharge port. This ensures that the plastic particles falling from the extra-large particle discharge port accurately land on the coarse particle feeding plate and are screened out, guaranteeing a clear discharge path for the extra-large plastic particles and preventing them from scattering randomly between the screen and the screen box. This improves the overall screening and discharge efficiency of the linear vibrating screen for plastic granules of different sizes, allowing plastic particles of different sizes to complete the screening and discharge process efficiently and orderly. Preferably, a fine particle feeding plate extends from one side of the fine particle screening zone of the screen box. By adopting the above technical solution, a fine particle feeding plate is extended to one side of the fine particle screening area of ​​the screen box. After the plastic particles pass through the screen, the fine plastic particles enter the fine particle screening area of ​​the screen box. Since the fine particle feeding plate extends from one side of the fine particle screening area, the fine plastic particles can be smoothly discharged from the screen box along the fine particle feeding plate, avoiding accumulation of fine plastic particles in the screen box. This ensures that the fine plastic particles can complete the screening and discharge process efficiently and smoothly, further improving the screening efficiency of the entire plastic particle linear vibrating screen for fine plastic particles. Preferably, the screen is inclined at 5-15 degrees. By adopting the above technical solution, the screen is inclined at 5-15 degrees, making it easier for the plastic particles to slide down the screen surface under the action of their own gravity, reducing the residence time of the plastic particles on the screen, and thus avoiding accumulation caused by long residence time. At the same time, this inclined setting helps to accelerate the movement speed of the plastic particles, allowing the plastic particles to pass through the screen for screening more quickly, thereby effectively improving the screening efficiency of the plastic particle linear vibrating screen. Furthermore, because the plastic granules move more smoothly, the chances of them getting stuck in the sieve holes are reduced, further improving the screening effect. It also reduces the frequency of manual sieve cleaning, saving time and labor costs, and improving the economic efficiency of the entire production process.

[0005] In summary, this application includes at least one of the following beneficial technical effects: 1. By dividing the screen into a fine particle screening zone, a coarse particle screening zone, and an ultra-large particle screening zone, the screen apertures in different screening zones are different. The fine particle screening zone has small screen apertures, which can screen out fine colloidal particles. The coarse particle screening zone has slightly larger screen apertures, which can screen out coarse colloidal particles. The ultra-large particle screening zone can separate out ultra-large colloidal particles, thus screening out fine colloidal particles, coarse colloidal particles, and ultra-large colloidal particles to meet diverse screening needs. 2. A cleaning device is installed at the bottom of the screen. The cleaning brush head in the cleaning device can slide back and forth between the feed end and the discharge end of the screen under the drive of the sliding mechanism. When it encounters the rubber particles stuck at the bottom of the screen, the cleaning brush head can directly clean them, avoiding the manual operation of removing the screen one by one for cleaning, reducing the tediousness of operation, and cleaning the screen without stopping the machine, so that the vibrating screen can work continuously, improving screening efficiency and reducing production costs. 3. With the screen tilted, the plastic granules move downwards on the screen under their own weight and the vibration of the screen box. During this process, it is easier for them to separate into layers. Smaller granules can pass through the screen holes more easily, while larger granules move along the surface of the screen. This helps the plastic granules move and separate on the screen, further improving the screening effect. Attached Figure Description

[0006] Figure 1 This is an exploded view of a linear vibrating screen for plastic granules, as described in Example 1. Figure 2 This is a structural diagram of a linear vibrating screen for plastic granules, as described in Example 1. Figure 3 This is a front view of a linear vibrating screen for plastic granules according to Example 1.

[0007] Explanation of reference numerals in the attached drawings: 1. Base; 2. Shock absorber; 3. Screen box; 4. Vibration drive component; 5. Screen mesh; 6. Cleaning device; 7. Feed hopper; 8. Guide component; 11. Support foot; 31. Fine particle feeding area; 32. Coarse particle feeding area; 33. Extra-large particle feeding area; 34. Separator plate; 35. Fine particle feeding plate; 36. Coarse particle feeding plate; 37. Extra-large particle feeding plate; 51. Fine particle screening area; 52. Coarse particle screening area; 53. Extra-large particle screening area; 531. Extra-large particle outlet; 61. Cleaning brush head; 62. Slide rail; 63. Slider; 64. Cleaning drive component; 81. Guide rod; 82. Guide plate. Detailed Implementation

[0008] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0009] Example 1 This application provides an embodiment of a linear vibrating screen for plastic granules, referring to... Figure 1 and Figure 2It includes a base 1, a shock absorber 2, a screen box 3, a vibration drive 4, a screen 5, and a cleaning device 6. The shock absorber 2 is positioned above and securely connected to the base 1. The screen box 3 is positioned above and securely connected to the shock absorber 2. The shock absorber 2, located between the base 1 and the screen box 3, acts as a buffer, reducing the impact of vibration on the base 1 and the surrounding environment, and ensuring the stability of the vibrating screen's operation. The vibration drive 4 is located at the bottom of the screen box 3 and drives the screen box 3 to vibrate in a linear reciprocating motion. The screen 5 is installed directly above the screen box 3 and is used to screen plastic granules. In this embodiment, the screen 5 is divided into a fine particle screening zone 51, a coarse particle screening zone 52, and an extra-large particle screening zone 53 from the feed end to the discharge end, which can screen out fine, coarse, and extra-large particles. Correspondingly, the screen box 3 located below the screen 5 is provided with a fine particle feeding zone 31, a coarse particle feeding zone 32, and an extra-large particle feeding zone 33 to facilitate the separate feeding of particles of different sizes. The cleaning device 6 is located at the bottom of the screen 5 and is used to clean the particles stuck at the bottom of the screen 5. It can push the particles stuck in the screen holes onto the screen 5 for secondary screening, avoiding the particles from clogging the screen holes and improving the screening efficiency. Specifically, the base 1 in this embodiment is made of sturdy metal material, which has good strength and stability. The four corners of the base 1 are provided with silicone support feet 11, which can stably support the weight of the entire vibrating screen and the vibration generated during operation. The base 1 has a rectangular frame structure, which can evenly distribute the weight of the vibrating screen and prevent excessive local stress. Specifically, in this embodiment, the shock absorber 2 is a rubber helical spring. Rubber helical springs have high load-bearing capacity and elastic coefficient, and are helical in shape. They are installed between the base 1 and the screen box 3 using bolts or other methods to ensure a stable connection. Specifically, in this embodiment, the screen box 3 is a box structure with a certain amount of accommodating space, welded from steel plates. It has a certain strength and rigidity, and can withstand the vibration force generated by the vibration drive component 4. Its internal space is used to accommodate the screened granules and guide their discharge.

[0010] Reference Figure 3 Specifically, in this embodiment, the vibration drive component 4 is a vibration motor. The vibration motor generates horizontally canceling and vertically superimposed excitation forces through the rotation of the eccentric block, driving the screen box 3 to vibrate in a linear reciprocating motion. The vibration motor is installed at the bottom of the screen box 3 by bolts or other means, ensuring both connection stability and space saving. Besides the vibration motor used in this embodiment, an electromagnetic vibrator can also be used, which generates vibration force using the principle of electromagnetic induction. It features high vibration frequency and small amplitude, making it suitable for applications requiring high screening accuracy. (Refer to...) Figure 2Specifically, in this embodiment, the screen 5 is divided into a fine particle screening zone 51, a coarse particle screening zone 52, and an extra-large particle screening zone 53. Different zones can screen plastic particles of different sizes. In this embodiment, the fine particle screening zone 51 and the coarse particle screening zone 52 are both equipped with circular screen holes, while the extra-large particle screening zone 53 is equipped with a long, narrow extra-large particle outlet 531. Furthermore, the diameter of the screen holes in the fine particle screening zone 51 is smaller than that in the coarse particle screening zone 52, thus enabling the screening of plastic particles of different sizes. The screen 5 is made of stainless steel, which is corrosion-resistant and has high strength. In this embodiment, the screen 5 is detachably installed on the screen box 3 using bolts or other methods for easy replacement and cleaning. However, in other embodiments, the screen 5 and the screen box 3 can be detachably connected via a slotted connection. In particular, the screen 5 in this embodiment is tilted at a small angle of 5-15 degrees, which is beneficial for the movement and screening of plastic particles on the screen 5.

[0011] Furthermore, in this embodiment, the feed end of the screen 5 is provided with a feed hopper 7. The feed hopper 7 is funnel-shaped with a larger top and a smaller bottom, and is made of metal plate. It can guide plastic particles to fall evenly from the feed hopper 7 into the feed end of the screen 5.

[0012] Specifically, in this embodiment, the screen 5 is equipped with a guide member 8, which includes a guide rod 81 near the feed hopper 7 and guide plates 82 symmetrically installed on both sides of the guide rod 81. The guide rod 81 is installed directly above the screen 5 in a direction perpendicular to the direction of plastic particle conveying. The two sides of the guide rod 81 are respectively installed on the inner walls of the two sides of the screen 5. Both guide plates 82 are right-angled triangular structures, with their two right-angled sides respectively located on the guide rod 81 and the side wall of the screen 5. The two guide plates 82 are located between the guide rod 81 and the screen 5, and together with the guide rod 81, they form a trapezoidal channel. The trapezoidal channel is narrower at the top and wider at the bottom. Both the guide rod 81 and the guide plates 82 are made of metal, possessing a certain strength and a smooth surface. When the plastic particles enter the screen 5 from the feed hopper 7, they can be dispersed and distributed on the screen 5 through the trapezoidal channel, allowing the plastic particles to be screened more evenly and improving the screening effect. Specifically, in this embodiment, the sieve box 3 is sequentially provided with a fine particle feeding area 31, a coarse particle feeding area 32, and an extra-large particle feeding area 33 corresponding to the different screening zones of the sieve screen 5. Specifically, the sieve box 3 is provided with a partition plate 34, a fine particle feeding plate 35, a coarse particle feeding plate 36, and an extra-large particle feeding plate 37. The bottom of the partition plate 34 is installed on the upper surface of the sieve box 3, and the partition plate 34 is located between the fine particle feeding area 31 and the coarse particle feeding area 32, used to separate the fine particle feeding area 31 and the coarse particle feeding area 32 to separate particles of different sizes. A fine particle feeding plate 35 extends from one side of the fine particle screening area 51 of the sieve box 3, facilitating the falling of fine particles from the fine particle screening area 51 to the fine particle feeding area 31, and then being screened out by the fine particle feeding plate 35. The discharge end of the screen box 3 is provided with a coarse particle discharge plate 36, which allows coarse particles falling from the coarse particle screening zone 52 of the screen 5 to be smoothly discharged along the coarse particle discharge plate 36 under the action of vibration of the screen box 3. The extra-large particle discharge plate 37 is correspondingly arranged directly below the extra-large particle discharge port 531 of the screen 5, and the extra-large particle discharge plate 37 is arranged between the screen 5 and the screen box 3. A gap is formed between the extra-large particle discharge plate 37 and the screen box 3 to allow coarse particles to pass through, so that the extra-large particles fall from the extra-large particle discharge port 531 to the extra-large particle discharge plate 37 and are screened out. Specifically, the cleaning device 6 in this embodiment includes a cleaning brush head 61 slidably disposed on the screen 5, a slide rail 62, a slider 63, and a cleaning drive component 64. Slide rails 62 are provided on both sides of the screen 5, and sliders 63 are slidably disposed on both slide rails 62, with the sliders 63 sliding in cooperation with the slide rails 62. The cleaning brush head 61 is connected to the sliders 63 on both sides. The cleaning drive component 64 is disposed on one side of the screen 5 and drives the slider 63 to move, thereby causing the cleaning brush head 61 to reciprocate at the bottom of the screen 5. The cleaning drive component 64 is a cylinder, and the piston rod of the cylinder is connected to the slider 63. The movement of the slider 63 is driven by the extension and retraction of the cylinder.Specifically, the cleaning brush head 61 in this embodiment is equipped with a flexible bristle end, which can be made of nylon bristles or pig bristles. These bristles are soft and can effectively push out the plastic particles stuck at the bottom of the screen 5 without damaging the screen 5. The flexible bristle end abuts against the bottom of the screen 5, and can push out the plastic particles stuck in the screen holes when the cleaning brush head 61 slides back and forth. In particular, the height design of the partition plate 34 does not affect the reciprocating movement of the cleaning brush head 61. The implementation principle of this embodiment is as follows: plastic particles fall evenly into the screen 5 through the metal feed hopper 7, which is larger at the top and smaller at the bottom. The screen 5 has an opening of 5-15 degrees. The screen 5 is inclined and equipped with guides 8. A trapezoidal channel (narrower at the top and wider at the bottom, formed by guide rods 81 and right-angled triangular guide plates 82 on both sides) disperses the granules on the screen 5. The screen 5 is divided into a fine particle screening zone 51 (circular screen holes), a coarse particle screening zone 52 (circular screen holes, with a diameter larger than that of the fine particle screening zone 51), and an extra-large particle screening zone 53 (elongated discharge port) from the feed end to the discharge end. During the linear reciprocating motion of the screen box 3 driven by the vibrating motor (or electromagnetic vibrator), fine granules fall through the screen holes of the fine particle screening zone 51 into the fine particle feeding zone 31 of the screen box 3, and are screened out by the fine particle feeding plate 35; coarse granules pass through... Coarse particles fall into the coarse particle feeding area 32 of the screen box 3 through the screen holes 52, and are discharged along the coarse particle feeding plate 36 under the vibration of the screen box 3. Large particles fall from the large particle discharge port 531 to the large particle feeding plate 37 (located between the screen 5 and the screen box 3 with a gap) and are screened out. During the screening process, the cylinder of the cleaning device 6 drives the slider 63 to move on the slide rails 62 on both sides of the screen 5, which drives the cleaning brush head 61 (with flexible bristle end and abutting against the bottom of the screen 5) connected to the slider 63 to slide back and forth at the bottom of the screen 5, pushing out the particles stuck in the screen holes to the screen 5 for secondary screening, avoiding screen hole blockage and improving screening efficiency. Example 2 The difference between this embodiment 2 and embodiment 1 is that the sliding mechanism of the cleaning device 6 can take another form. It includes a synchronous belt disposed on both sides of the screen 5 and a synchronous pulley that drives the synchronous belt to rotate. The cleaning drive 64 drives the synchronous pulley to rotate, thereby driving the synchronous belt to rotate cyclically. The two sides of the cleaning brush head 61 are connected to the synchronous belt respectively, and reciprocate as the synchronous belt rotates. The synchronous belt has the advantages of smooth transmission and low noise, and can more accurately control the sliding of the cleaning brush head 61. Everything else is the same as in embodiment 1. The implementation principle of this embodiment is that this synchronous belt sliding mechanism can also realize the reciprocating sliding of the cleaning brush head 61 at the bottom of the screen 5, so as to achieve the purpose of cleaning the plastic particles at the bottom of the screen 5. It utilizes the transmission characteristics of the synchronous belt to make the cleaning process more stable and reliable, reduces the jamming phenomenon that may occur in the existing slide rail 62 slider 63 mechanism, further improves the working efficiency and reliability of the cleaning device 6, and optimizes the overall performance of the plastic particle linear vibrating screen to a certain extent.

[0013] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A linear vibrating screen for plastic granules, characterized in that, The system includes a base (1), a shock absorber (2), a sieve box (3), a vibration drive (4), and a sieve screen (5) with several sieve holes. The shock absorber (2) is disposed between the base (1) and the sieve box (3). The vibration drive (4) is disposed in the sieve box (3). The sieve screen (5) is installed in the sieve box (3) and located directly above the sieve box (3). The sieve screen (5) is divided into a fine particle screening area (51), a coarse particle screening area (52), and an ultra-large particle screening area (53) for screening out fine particles. The screen box (3) is provided with a fine particle feeding area (31), a coarse particle feeding area (32) and an extra-large particle feeding area (33) respectively. A cleaning device (6) is provided at the bottom of the screen (5). The cleaning device (6) includes a cleaning brush head (61) that is slidably disposed on the screen (5). The cleaning brush head (61) slides back and forth between the feed end and the discharge end of the screen (5) to push out the particles stuck at the bottom of the screen (5).

2. The linear vibrating screen for plastic granules according to claim 1, characterized in that, The cleaning device (6) further includes a sliding mechanism for driving the cleaning brush head (61) to slide back and forth. The sliding mechanism includes a slide rail (62) disposed on both sides of the screen (5), a slider (63) that slides with the slide rail (62), and a cleaning drive (64) that drives the slider (63) to move. The cleaning drive (64) is disposed on the screen (5), and both sides of the cleaning brush head (61) are respectively connected to the slider (63).

3. A linear vibrating screen for plastic granules according to claim 2, characterized in that, The cleaning brush head (61) is provided with flexible bristle ends, which abut against the bottom of the screen (5).

4. A linear vibrating screen for plastic granules according to claim 1, characterized in that, The screen (5) can be detachably installed in the screen box (3).

5. A linear vibrating screen for plastic granules according to claim 1, characterized in that, The diameter of the sieve hole in the fine particle screening zone (51) of the sieve (5) is smaller than the diameter of the sieve hole in the coarse particle screening zone (52), and the ultra-large particle screening zone (53) of the sieve (5) is provided with an ultra-large particle outlet (531).

6. A linear vibrating screen for plastic granules according to claim 1, characterized in that, The feed end of the screen (5) is provided with a feed hopper (7).

7. A linear vibrating screen for plastic granules according to claim 6, characterized in that, The screen (5) is provided with a guide (8), which includes a guide rod (81) near the feed hopper (7) and guide plates (82) symmetrically installed on both sides of the guide rod (81). The two guide plates (82) are located between the guide rod (81) and the screen (5). The two guide plates (82) and the guide rod (81) form a trapezoidal channel so that the colloid particles passing through the trapezoidal channel are dispersed on the screen (5).

8. A linear vibrating screen for plastic granules according to claim 5, characterized in that, The screen box (3) is provided with a partition plate (34), a coarse particle feeding plate (36) and an extra-large particle feeding plate (37). The partition plate (34) is located between the fine particle feeding area (31) and the coarse particle feeding area (32). The discharge end of the screen box (3) is provided with the coarse particle feeding plate (36) so that the colloid particles fall from the coarse particle screening area (52) of the screen (5) to the coarse particle feeding area (32) of the screen box (3) and are screened out by the coarse particle feeding plate (36). The extra-large particle feeding plate (37) is provided between the screen (5) and the screen box (3) corresponding to the extra-large particle discharge port (531) so that the colloid particles fall from the extra-large particle discharge port (531) to the coarse particle feeding plate (36) and are screened out.

9. A linear vibrating screen for plastic granules according to claim 1, characterized in that, A fine particle feeding plate (35) is provided on one side of the fine particle screening area (51) of the sieve box (3).

10. A linear vibrating screen for plastic granules according to claim 1, characterized in that, The screen (5) is inclined at 5-15 degrees.

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