Composite flame-retardant master batch screening structure and screening method thereof

Abstract

This invention relates to the field of plastic masterbatch processing technology, and particularly to a composite flame-retardant masterbatch screening structure and screening method, comprising a support, a screen plate, and a receiving plate. The screen plate is connected to a vibration mechanism, and a dustproof cylinder is connected above the screen plate. An inverted conical screen cylinder is set above the screen plate inside the dustproof cylinder. A rotating shaft is vertically set above the screen cylinder inside the dustproof cylinder, extending along the center of the screen cylinder into the screen cylinder. A rotating rod is connected to the side of the rotating shaft, and the rotating shaft is connected to a drive mechanism. The dustproof cylinder is connected to an air inlet pipe and a suction pipe. The air inlet pipe is connected to a drying air source, and the suction pipe is connected to a negative pressure device. The dustproof cylinder is connected to a feed pipe and a first discharge pipe. The feed pipe extends to the top of the screen cylinder, and the end of the first discharge pipe is connected to the bottom of the screen cylinder and equipped with an electric valve. This invention has the following beneficial effects: it can perform secondary screening of flame-retardant masterbatch with a high degree of refinement, and can dry and remove impurities from the flame-retardant masterbatch, improving product quality and increasing work efficiency.

Description

Technical Field

[0001] This invention relates to the field of plastic masterbatch processing technology, and in particular to a composite flame retardant masterbatch screening structure and screening method. Background Technology

[0002] With the advancement of technology and the improvement of living standards, polymer materials, especially synthetic polymers such as plastics and rubber, are playing an increasingly important role in people's lives, and their applications are expanding year by year. However, most organic polymer materials have varying degrees of flammability in air. To realize their applications in various industries such as military, aerospace, transportation, power, and civilian use, flame-retardant modification has become a new challenge. A more ideal method for flame-retardant modification of plastics is often to improve their fire resistance by adding flame retardants or flame-retardant masterbatches.

[0003] Flame retardant masterbatch (bromine-based / halogen-based), also known as flame retardant masterbatch, is one of the best-performing flame retardant products in plastics and rubber resins. It is a granular product made by organically combining, modifying, and synergistically combining various flame retardant components on the basis of flame retardants, and then mixing, extruding, and granulating using a twin-screw or triple-screw extruder. Unlike flame retardants, flame retardant masterbatch has many advantages, including easy addition to resins, cleanliness and hygiene, high flame retardant efficiency, small dosage, minimal impact on the mechanical properties of the resin, and less likelihood of delamination, streaking, or precipitation after addition. It also saves manpower, material costs, and time. Generally, the dispersibility, flowability, compatibility, thermal stability, and weather resistance of flame retardant masterbatch in resins are significantly better than those of ordinary flame retardants. Furthermore, a properly formulated flame retardant masterbatch has a much higher flame retardant efficiency and performance (cost-effectiveness) than ordinary flame retardants. Therefore, flame retardant masterbatch has become one of the best choices for achieving fire protection requirements in flame-retardant plastic products and an effective substitute for flame retardant powders.

[0004] Flame retardant masterbatches are mostly in the form of tablets or strips, similar in size to regular plastic granules. During the production process, flame retardant masterbatches of different sizes need to be screened to meet various requirements.

[0005] Vibrating screens are currently one of the main devices used for screening flame retardant masterbatches. The vibrating screen separates the flame retardant masterbatches placed on a screen mesh by vibration; smaller masterbatches fall through the screen mesh, while larger masterbatches remain, thus separating the two sizes. However, this type of vibrating screen used for screening flame retardant masterbatches has the following problems: 1. Conventional vibrating screens can only screen two sizes of flame retardant masterbatch, that is, they can only screen smaller flame retardant masterbatch from larger flame retardant masterbatch. If you want to continue to screen smaller flame retardant masterbatch, you need to replace the screen plate. Therefore, its screening fineness is not enough. 2. Vibrating screens themselves have the problem of easy material accumulation. Especially with the maturity and popularization of underwater pelletizing technology, more and more manufacturers are starting to use underwater pelletizing technology. If the flame retardant masterbatch after cutting is not dried in time, the flame retardant masterbatch will easily clump together, making it even more difficult to screen. 3. During processing, transportation, and storage, flame retardant masterbatch is easily contaminated with dust. Furthermore, when flame retardant masterbatch is subjected to collisions and friction, it will produce debris. In general vibrating screening processes, this dust and debris cannot be separated in a targeted manner. Some of it will be raised, affecting the workshop environment, while the rest will be shipped together with the flame retardant masterbatch, affecting the appearance and quality of the product. Summary of the Invention

[0006] The purpose of this invention is to provide a composite flame retardant masterbatch screening structure that can perform secondary screening of flame retardant masterbatch and can dry and remove impurities from the flame retardant masterbatch.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A composite flame-retardant masterbatch screening structure includes a support, a screen plate, and a receiving plate. The screen plate is connected to a vibration mechanism, and a dustproof cylinder is connected above the screen plate. An inverted conical screen cylinder is installed above the screen plate inside the dustproof cylinder. A rotating shaft is vertically installed above the screen cylinder inside the dustproof cylinder. The rotating shaft extends along the center of the screen cylinder into the screen cylinder. A rotating rod is connected to the side of the rotating shaft, and the rotating shaft is connected to a drive mechanism. The dustproof cylinder is connected to an air inlet pipe and a suction pipe. The air inlet pipe is connected to a drying air source, and the suction pipe is connected to a negative pressure device. The dustproof cylinder is connected to a feed pipe and a first discharge pipe. The feed pipe extends to the top of the screen cylinder, and the end of the first discharge pipe is connected to the bottom of the screen cylinder and is equipped with an electric valve.

[0008] Preferably, the drive mechanism includes a rotary motor, a universal joint, a first bevel gear, and a second bevel gear. The rotary motor is connected to the bracket and its power output end is connected to the universal joint. The other end of the universal joint is connected to a transmission rod. A through hole is opened on the side of the dustproof cylinder for the transmission rod to pass through. The transmission rod is rotatably disposed in the dustproof cylinder in the horizontal direction. The transmission rod is connected to the first bevel gear, and the first rotating shaft is connected to the second bevel gear. The first bevel gear and the second bevel gear are meshed.

[0009] Preferably, the screen cylinder is rotated in the opposite direction to the rotating shaft.

[0010] Preferably, the drive mechanism also includes bevel gear three, bevel gear four, rotating shaft two, gear ring, annular slide rail, and slider. The annular slide rail is arranged along the inner wall of the dustproof cylinder, the slider is arranged on the side of the screen cylinder and connected to the slide rail, the gear ring is arranged along the inner wall of the screen cylinder, the rotating shaft two is arranged to rotate vertically, and the lower end of the rotating shaft two is connected to a rotating gear, which meshes with the gear ring. The upper end of the rotating shaft two is connected to bevel gear four, bevel gear three is connected to the transmission rod, and bevel gear three meshes with bevel gear four. The orientation of bevel gear three is opposite to that of bevel gear one.

[0011] Preferably, the dustproof cylinder is also equipped with a leveling device for spreading the flame-retardant masterbatch on the sieve tray.

[0012] Preferably, the leveling device includes pulley one, pulley two, pulley three, pulley four, shaft three, shaft four, and a spreading plate. Shaft three is vertically rotatable near the inner wall of the dustproof cylinder, and its upper and lower ends are connected to pulley two and pulley three respectively. Pulley one is connected around the lower side of the screen cylinder, and pulley one is connected to pulley two by a belt. Shaft four is vertically rotatable along the center of the screen plate, and the upper end of shaft four is connected to pulley four. Pulley three is connected to pulley four by a belt, and the lower end of shaft four is connected to the spreading plate.

[0013] Preferably, the vibration mechanism includes a vibration motor and a vibration rod. The power output end of the vibration motor is connected to the turntable. One end of the vibration rod is hinged to the outer wall of the screen plate, and the other end is rotatably connected to the turntable. The connection between the vibration rod and the turntable is eccentric. A swing arm is connected between the screen plate and the receiving plate, and the two ends of the swing arm are rotatably connected to the screen plate and the receiving plate, respectively.

[0014] Preferably, an inclined plate and a hydraulic cylinder are rotatably mounted on the support. One end of the hydraulic cylinder is hinged to the support, and the other end is hinged to the inclined plate. The end of the inclined plate away from the hydraulic cylinder is rotatably connected to the support. A vibrating motor and a receiving tray are mounted on the surface of the inclined plate, and a screen is mounted above the receiving tray.

[0015] Another object of the present invention is to provide a method for screening composite flame retardant masterbatch, comprising the following steps: Step 1: Feeding. Add the flame retardant masterbatch granules into the screen cylinder along the feed pipe. Step 2: Turn on the machine and input drying gas into the screen cylinder through the air inlet pipe. Use the suction pipe to suck up the inside of the dustproof cylinder. Start the rotating motor. Rotating shaft one and rotating shaft two rotate in opposite directions. Rotating rod and screen cylinder rotate in opposite directions. The drying gas dries the flame retardant masterbatch. When the suction pipe sucks up the dust and debris in the dustproof cylinder, the rotating rod and screen cylinder rotate in opposite directions, breaking up the clumps of flame retardant masterbatch. At the same time, the flame retardant masterbatch, dust and debris are raised, which facilitates drying and the removal of dust and debris. Step 3: First screening and first discharge. The smaller flame retardant masterbatch in the screen cylinder falls through the mesh of the screen cylinder onto the screen plate below. The electric valve is opened, and the larger flame retardant masterbatch remaining in the screen cylinder is output through the first discharge pipe. Step 4: Secondary screening and secondary discharge. After the flame retardant masterbatch falling on the screen plate is screened by vibration, the smaller flame retardant masterbatch falls into the receiving tray below. The hydraulic cylinder is started to rotate the inclined plate to an inclined state. At this time, the screen plate is tilted to discharge the material. Step 5: Discharge in three stages. The receiving tray tilts along with the inclined plate and discharges material during vibration.

[0016] Preferably, in step four, while the screen is vibrating and screening, a spreader is used to flatten the surface of the screen to prevent the flame retardant masterbatch from piling up on the screen.

[0017] In summary, the present invention has the following beneficial effects: 1. The present invention is equipped with a sieve disc and a sieve cylinder. When the flame retardant masterbatch is vibrated and sieved, the flame retardant masterbatch is sieved twice through the sieve cylinder and sieve disc. Three specifications of flame retardant masterbatch can be sieved at one time. The flame retardant masterbatch can be separated according to a more refined standard, and the degree of refinement is higher. 2. By setting a rotating rod, the present invention strikes the flame retardant masterbatch during the feeding and screening process, breaking up the clumps of flame retardant masterbatch, so that the flame retardant masterbatch can be screened more thoroughly. 3. Drying gas is introduced into the screen cylinder through the air inlet pipe to dry the moisture on the flame retardant masterbatch, further reducing the clumping of the flame retardant masterbatch. At the same time, reducing the moisture content of the flame retardant masterbatch helps to improve the quality of the product. 4. While using the sieve cylinder for sieving, use the suction pipe to suck out the dust and debris from the inside of the dustproof cylinder, which helps to improve the appearance and quality of the product. 5. During screening, the screen rotates, causing the flame retardant masterbatch in the screen to move out of the screen and pass through the screen under the action of centrifugal force, thus speeding up the screening and improving work efficiency. 6. When the sieve cylinder rotates, the flame retardant masterbatch in the sieve cylinder will move upward along the inner wall of the sieve cylinder under the action of centrifugal force. Under the vibration of the sieve cylinder, the flame retardant masterbatch will be bounced up along the inner surface of the sieve cylinder. The bounced flame retardant masterbatch will contact the rotating rod, causing the clumps of flame retardant masterbatch to be broken up, which further helps to reduce the clumping of flame retardant masterbatch. 7. The screen cylinder vibrates while rotating, causing the flame retardant masterbatch to be bounced up continuously in the screen cylinder, which makes it more fully contacted with the drying gas, thus improving the drying speed and effect. 8. When the screen cylinder rotates and vibrates, not only are the flame retardant masterbatches bounced up, but the dust and debris in the screen cylinder are also lifted up. This helps the suction pipe to suck up the dust and debris, making the dust removal and slag removal effect better. 9. When using a screen tray for screening, use a leveling device to level the flame retardant masterbatch on the surface of the screen tray to avoid material accumulation on the screen tray surface; 10. The inclined plate and hydraulic cylinder provided in this invention can tilt the screen plate and receiving plate during material discharge by tilting the inclined cylinder, and the vibration of the screen plate and receiving plate can make the material discharge smooth. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the vibration mechanism in this invention; Figure 3 This is a cross-sectional view of the entire invention; Figure 4 yes Figure 3 Enlarged diagram of section A in the middle; Figure 5 This is a top view of the sieve cylinder in this invention; Figure 6 This is a top view of the sieve disc in this invention.

[0019] In the diagram, 1. Bracket; 11. Base; 12. Mounting plate; 13. Connecting plate; 14. Support plate; 15. Inclined plate; 16. Hydraulic cylinder; 17. Receiving tray; 18. Third discharge pipe; 19. Third valve; 110. Vibrating motor; 111. Vibrating rod; 112. Turntable; 113. Swing arm; 2. Dustproof cylinder; 21. Screen plate; 22. Second discharge pipe; 23. Second valve; 3. Screen cylinder; 31. Circular slide rail; 32. Slider; 33. Gear ring; 34. Electric valve; 35. First discharge pipe; 3 6. Feed pipe; 4. Rotating motor; 41. Universal joint; 42. Transmission rod; 43. Through hole; 44. Bevel gear one; 45. Bevel gear two; 46. Bevel gear three; 47. Bevel gear four; 48. Fixed plate; 49. Rotating shaft one; 410. Rotating rod; 411. Rotating shaft two; 412. Rotating gear; 413. Air inlet pipe; 414. Suction pipe; 415. Connecting rod; 51. Pulley one; 52. Pulley two; 53. Pulley three; 54. Pulley four; 55. Rotating shaft three; 56. Rotating shaft four; 57. Spreader. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention. Example

[0022] A composite flame retardant masterbatch sieving structure like Figure 1 and Figure 2As shown, the device includes a bracket 1, which has a base 11 placed horizontally on the site of use and a mounting plate 12 vertically connected to the base 11. Two connecting plates 13 and a support plate 14 are mounted on the base 11. An inclined plate 15 is mounted on the base 11, with one end of the inclined plate 15 rotatably connected to both sides of the two connecting plates 13, and the other end of the inclined plate 15 resting on the support plate 14, so that it is in a horizontal position under normal conditions. A hydraulic cylinder 16 is mounted on the bracket 1, with one end of the hydraulic cylinder 16 hinged to the mounting plate 12, and the power output end of the hydraulic cylinder 16 hinged to the upper surface of the inclined plate 15 near the support plate 14. By retracting the power output end of the hydraulic cylinder 16, one end of the inclined plate 15 is pulled up, causing the inclined plate 15 to tilt, thereby tilting the mechanism on the inclined plate 15 simultaneously.

[0023] A receiving tray 17 is mounted on the inclined plate 15 to receive the flame-retardant masterbatch screened down from above. A third discharge pipe 18 is mounted on the side of the receiving tray 17 away from the hydraulic cylinder 16, and a third valve 19 is mounted on the third discharge pipe 18. A dustproof cylinder 2 is mounted above the receiving tray 17. A vibration mechanism is also mounted on the inclined plate 15, which includes a vibration motor 110, a vibration rod 111, a turntable 112, and swing arms 113. The vibration motor 110 is mounted on the surface of the inclined plate 15 near the hydraulic cylinder 16, and its power output end is concentrically connected to the turntable 112. The two ends of the vibration rod 111 are rotatably connected to the dustproof cylinder 2 and the turntable 112, respectively, wherein the connection between the vibration rod 111 and the turntable 112 is eccentric. The dustproof cylinder 2 and the receiving tray 17 are connected by two swing arms 113. Each swing arm 113 is set vertically, and its upper and lower ends are rotatably connected to the dustproof cylinder 2 and the receiving tray 17, respectively.

[0024] like Figures 3-6 As shown, a screen 21 is installed at the bottom of the dustproof cylinder 2 and above the receiving tray 17. A second discharge pipe 22 is installed on the side of the screen 21 away from the hydraulic cylinder 16, and a second valve 23 is installed on the second discharge pipe 22. During discharge, the hydraulic cylinder 16 drives the inclined plate 15 to rise near the end of the hydraulic cylinder 16. At this time, the discharge ends of both the screen 21 and the receiving tray 17 are in a downward inclined state, which makes discharge easier.

[0025] A conical screen cylinder 3 is rotatably mounted above the screen disc 21. A circular annular slide rail 31 is horizontally mounted circumferentially along the inner wall of the dustproof cylinder 2. Four sliders 32 are mounted on the outer surface of the screen cylinder 3, each connected to the annular slide rail 31, allowing the screen cylinder 3 to rotate. During screening, the screen cylinder 3 rotates and vibrates simultaneously, causing smaller flame-retardant masterbatches to be screened out from the screen mesh on the side of the screen cylinder 3 and fall onto the screen disc 21 below. A first discharge pipe 35 is connected to the bottom of the screen cylinder 3, extending beyond the dustproof cylinder 2 at its end. A bearing is installed at the connection between the first discharge pipe 35 and the screen cylinder 3, ensuring that the first discharge pipe 35 remains stationary when the screen cylinder 3 rotates. An electric valve 34 is installed at the bottom of the screen cylinder 3; when the electric valve 34 is opened, the flame-retardant masterbatches inside the screen cylinder 3 are discharged along the first discharge pipe 35.

[0026] A leveling device is also provided below the screen cylinder 3 to level the flame-retardant masterbatch on the screen plate 21 and prevent material accumulation. A pulley 51 is installed circumferentially along the lower part of the screen cylinder 3. A rotating shaft 55 is vertically installed on the side wall inside the dustproof cylinder 2, and a rotating shaft 56 is vertically installed above the screen plate 21 and along the center of the screen plate 21 inside the dustproof cylinder 2. Both rotating shafts 55 and 56 are rotatable. Pulleys 52 and 53 are connected to the upper and lower ends of rotating shaft 55, respectively. A pulley 54 is connected to the upper end of rotating shaft 56. Pulleys 51 and 52 are connected by belts. Pulleys 53 and 54 are connected by belts. A horizontally arranged spreader 57 is connected to the bottom of rotating shaft 56, with the bottom of the spreader 57 positioned close to the upper surface of the screen plate 21. The rotation of the screen cylinder 3 drives the pulley 1 51 to rotate, and drives the pulley 2 52, the shaft 3 55, the pulley 3 53, the pulley 4 54, and the shaft 4 56 to rotate, thereby driving the spreader 57 to rotate. While the spreader 57 rotates, it spreads the flame retardant masterbatch on the screen plate 21 to prevent material from piling up on the screen plate 21.

[0027] The upper part of the dustproof cylinder 2 is equipped with a drive mechanism, including a drive motor 4, a universal joint 41, and a transmission rod 42. The universal joint 41 used in this embodiment is a telescopic universal joint 41, which is existing technology and will not be described in detail. A through hole 43 is provided on the side of the dustproof cylinder 2 for the transmission rod 42 to extend into it. The size of the through hole 43 is larger than that of the transmission rod 42, so that the dustproof cylinder 2 will not interfere with the transmission rod 42 when it vibrates or tilts. A connecting rod 415 is connected downwards from the top of the dustproof cylinder 2, and the transmission rod 42 is connected to the connecting rod 415 via a bearing. A first bevel gear 44 and a third bevel gear 46 are mounted on the transmission rod 42, both in opposite directions. A fixing plate 48 is fixedly installed inside the dustproof cylinder 2 below the transmission rod 42. A first rotating shaft 49 and a second rotating shaft 411 are rotatably mounted on the fixing plate 48 using bearings. A rotating shaft 49 is located at the center of the sieve cylinder 3, with its lower end extending into the sieve cylinder 3 and connected to several rotating rods 410. A bevel gear 45 is connected to its upper end, meshing with bevel gear 44. A rotating shaft 411 is located near the side of the sieve cylinder 3, with its lower end extending to the inner wall of the sieve cylinder 3 and connected to a rotating gear 412. A toothed ring 33 is installed circumferentially along the inner wall of the top of the sieve cylinder 3, meshing with the rotating gear 412. A bevel gear 47 is connected to the upper end of the rotating shaft 411, meshing with bevel gear 46. A dustproof cylinder 2 is located directly above the sieve cylinder 3 and connected to an air inlet pipe 413 and a suction pipe 414, both pointing downwards towards the sieve cylinder 3. The air inlet pipe 413 is connected to a drying air source, used to blow dry hot air into the sieve cylinder 3. One end of the suction pipe 414 is flared, and the other end is connected to a negative pressure device, such as an air pump, to suck away the dust and debris between the flame retardant masterbatches in the sieve cylinder 3. Both the air inlet pipe 413 and the suction pipe 414 are flexible hoses.

[0028] In another embodiment of the present invention, both the air inlet pipe 413 and the suction pipe 414 are rigid pipes. Holes are provided on the dustproof cylinder 2 for the air inlet pipe 413 and the suction pipe 414 to pass through, and a certain amount of clearance is left between the holes and the air inlet pipe 413 and the suction pipe 414 so that the two pipes will not come into contact with the dustproof cylinder 2, and are therefore not affected by vibration and tilt.

[0029] The dustproof cylinder 2 is connected to a feed pipe 36 on its side. The feed pipe 36 extends to the top of the screen cylinder 3 and is set downward toward the opening of the screen cylinder 3.

[0030] How to use: Step 1: Feeding. Add the flame retardant masterbatch granules into the screen cylinder 3 along the feed pipe 36. Step 2: Start the machine and turn on the vibration motor 110 to make the dustproof cylinder 2 start vibrating. Drying gas is input into the screen cylinder 3 along the air inlet pipe 413. The suction pipe 414 is used to suck up the inside of the dustproof cylinder 2. Start the rotating motor 4. The rotating shaft 1 49 and the rotating shaft 2 411 rotate in opposite directions. The rotating rod 410 and the screen cylinder 3 rotate in opposite directions. The drying gas dries the flame retardant masterbatch. When the suction pipe 414 is sucking, it removes the dust and debris in the dustproof cylinder 2. When the rotating rod 410 and the screen cylinder 3 rotate in opposite directions, they break up the clumps of flame retardant masterbatch and at the same time, they lift up the flame retardant masterbatch, dust and debris, which is convenient for drying and for sucking away the dust and debris. Step 3: First screening and first discharge. The smaller flame retardant masterbatch in screen cylinder 3 falls along the mesh of screen cylinder 3 onto the screen plate 21 below. The electric valve 34 is opened, and the larger flame retardant masterbatch remaining in screen cylinder 3 is output along the first discharge pipe 35. Step 4: Secondary screening and secondary discharge. After the flame retardant masterbatch falling on the screen plate 21 is screened by vibration, the smaller flame retardant masterbatch falls into the receiving plate 17 below. While the screen plate 21 is vibrating and screening, the surface of the screen plate 21 is flattened by the spreading plate 57 to prevent the flame retardant masterbatch from piling up on the screen plate 21. The hydraulic cylinder 16 is activated to rotate the inclined plate 15 to the inclined state. At this time, the screen plate 21 is tilted to discharge the material. Step 5: Three discharges. The receiving tray 17 tilts together with the inclined plate 15 and discharges material during vibration.

Claims

1. A composite flame-retardant masterbatch screening structure, comprising a support (1), a screen (21), and a receiving tray (17), wherein the screen (21) is connected to a vibration mechanism, characterized in that, A dustproof cylinder (2) is connected above the sieve disc (21). An inverted cone-shaped sieve cylinder (3) is set inside the dustproof cylinder (2) above the sieve disc (21). A rotating shaft (49) is vertically set inside the dustproof cylinder (2) above the sieve cylinder (3). The rotating shaft (49) extends along the center of the sieve cylinder (3) into the sieve cylinder (3). A rotating rod (410) is connected to the side of the rotating shaft (49). The rotating shaft (49) is connected to the drive mechanism. The dustproof cylinder (2) is connected to the air inlet pipe (413) and the suction pipe (414). The air inlet pipe (413) is connected to the drying air source. The suction pipe (414) is connected to the negative pressure device. The dustproof cylinder (2) is connected to the feed pipe (36) and the first discharge pipe (35). The feed pipe (36) extends to the top of the sieve cylinder (3). The end of the first discharge pipe (35) is connected to the bottom of the sieve cylinder (3) and is equipped with an electric valve (34). The drive mechanism includes a rotary motor (4), a universal joint (41), a first bevel gear (44), and a second bevel gear (45). The rotary motor (4) is connected to the bracket (1) and its power output end is connected to the universal joint (41). The other end of the universal joint (41) is connected to a transmission rod (42). A through hole (43) is opened on the side of the dustproof cylinder (2) for the transmission rod (42) to pass through. The transmission rod (42) is rotatably installed in the dustproof cylinder (2) in the horizontal direction. The transmission rod (42) is connected to the first bevel gear (44), and the first rotating shaft (49) is connected to the second bevel gear (45). The first bevel gear (44) and the second bevel gear (45) are meshed. The sieve cylinder (3) is rotated in the opposite direction to the rotation shaft (49); The drive mechanism also includes bevel gear three (46), bevel gear four (47), rotating shaft two (411), gear ring (33), annular slide rail (31), and slider (32). The annular slide rail (31) is arranged along the inner wall of the dustproof cylinder (2). The slider (32) is arranged on the side of the screen cylinder (3) and connected to the slide rail. The gear ring (33) is arranged along the inner wall of the screen cylinder (3). The rotating shaft two (411) is arranged to rotate in the vertical direction. The lower end of the rotating shaft two (411) is connected to a rotating gear (412). The rotating gear (412) meshes with the gear ring (33). The upper end of the rotating shaft two (411) is connected to bevel gear four (47). The bevel gear three (46) is connected to the transmission rod (42). The bevel gear three (46) meshes with the bevel gear four (47). The orientation of the bevel gear three (46) is opposite to that of the bevel gear one (44). The vibration mechanism includes a vibration motor (110) and a vibration rod (111). The power output end of the vibration motor (110) is connected to the turntable (112). One end of the vibration rod (111) is hinged to the outer wall of the screen (21), and the other end is rotatably connected to the turntable (112). The connection between the vibration rod (111) and the turntable (112) is eccentric. A swing arm (113) is connected between the screen (21) and the receiving plate (17). The two ends of the swing arm (113) are rotatably connected to the screen (21) and the receiving plate (17) respectively. An inclined plate (15) and a hydraulic cylinder (16) are rotatably mounted on the support (1). One end of the hydraulic cylinder (16) is hinged to the support (1), and the other end is hinged to the inclined plate (15). The end of the inclined plate (15) away from the hydraulic cylinder (16) is rotatably connected to the support (1). A vibrating motor (110) and a receiving tray (17) are mounted on the surface of the inclined plate (15), and a screen (21) is mounted above the receiving tray (17).

2. The composite flame-retardant masterbatch sieving structure according to claim 1, characterized in that, The dustproof cylinder (2) is also equipped with a leveling device for leveling the flame retardant masterbatch on the sieve tray (21).

3. The composite flame-retardant masterbatch sieving structure according to claim 2, characterized in that, The leveling device includes pulley one (51), pulley two (52), pulley three (53), pulley four (54), shaft three (55), shaft four (56), and a plate (57). Shaft three (55) is vertically rotatable near the inner wall of the dustproof cylinder (2), and its upper and lower ends are connected to pulley two (52) and pulley three (53) respectively. Pulley one (51) is connected around the lower side of the screen cylinder (3), and pulley one (51) is connected to pulley two (52) by a belt. Shaft four (56) is vertically rotatable along the center of the screen plate (21), and the upper end of shaft four (56) is connected to pulley four (54). Pulley three (53) is connected to pulley four (54) by a belt, and the lower end of shaft four (56) is connected to the plate (57).

4. A method for screening composite flame retardant masterbatch, characterized in that, Using the composite flame retardant masterbatch screening structure according to claim 1 includes the following steps: Step 1: Feeding. Add the flame retardant masterbatch granules into the screen cylinder (3) along the feed pipe (36); Step 2: Turn on the machine and input the drying gas into the screen cylinder (3) along the air inlet pipe (413). Use the suction pipe (414) to suck the inside of the dustproof cylinder (2). Start the rotating motor (4). The rotating shaft one (49) and rotating shaft two (411) rotate in opposite directions. The rotating rod (410) and the screen cylinder (3) rotate in opposite directions. The drying gas dries the flame retardant masterbatch. When the suction pipe (414) sucks the dust and debris in the dustproof cylinder (2), the rotating rod (410) and the screen cylinder (3) rotate in opposite directions, breaking up the clumps of flame retardant masterbatch. At the same time, the flame retardant masterbatch, dust and debris are lifted up, which is convenient for drying and for sucking away dust and debris. Step 3: First screening and first discharge. The smaller flame retardant masterbatch in the screen cylinder (3) falls along the mesh of the screen cylinder (3) onto the screen plate (21) below. The electric valve (34) is opened, and the larger flame retardant masterbatch remaining in the screen cylinder (3) is output through the first discharge pipe (35). Step 4: Secondary screening and secondary discharge. After the flame retardant masterbatch falling on the screen plate (21) is screened by vibration, the smaller flame retardant masterbatch falls into the receiving plate (17) below. Start the hydraulic cylinder (16) to make the inclined plate (15) rotate to the inclined state. At this time, the screen plate (21) is tilted to discharge the material. Step 5: Discharge in three stages. The receiving tray (17) tilts together with the inclined plate (15) and discharges material during vibration.

5. The method for screening composite flame retardant masterbatch according to claim 4, characterized in that, In step four, while the screen (21) is vibrating and screening, the surface of the screen (21) is flattened by the spreader (57) to prevent the flame retardant masterbatch from piling up on the screen (21).

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