Plastic granulator capable of screening plastic particles

Abstract

The invention provides a plastic granulator capable of screening plastic particles. The plastic granulator comprises an extruder, a cooling tank, a cutting mechanism and a screening mechanism, the cutting mechanism comprises a working frame; the rotating shaft is rotationally arranged on the rotating shaft; the cutting roller is mounted on the rotating shaft; the guide conveying assembly is used for conveying the materials; the ejection cleaning assembly is used for cleaning the cutting roller; and the driving assembly drives the rotating shaft to rotate. The conveying rod is driven by the belt to rotate so as to convey strip-shaped plastic to the cutting roller; the strip-shaped plastic is limited by the limiting groove, so that the strip-shaped plastic is prevented from deviating in the conveying process; when the rotating shaft rotates, the cutting roller is driven to cut strip-shaped plastic into plastic particles, then one end of the ejector rod is driven to slide to the protruding block and then stretch out, the particles clamped on the cutting roller are ejected out, and the cutting roller is cleaned.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic granulation, and particularly relates to a plastic granulation machine capable of screening plastic particles. Background Art

[0002] A plastic granulation machine is a device used to recycle and reprocess waste plastics into granular plastics. These granules can be used to produce new plastic products. The plastic granulation machine plays an important role in plastic recycling and reuse. Through a series of physical and chemical processes, the plastic granulation machine processes waste plastics into granules, which are efficient and environmentally friendly.

[0003] Chinese Patent Application No. 2024114254755 discloses a plastic granulation machine capable of screening plastic particles, including: an operation table; a cutting device for cutting plastic particles; a screening device for screening plastic particles; a turning device for turning plastic particles; an extruder and a cooling tank are installed on the operation table, a mounting frame is installed on the operation table, the screening device includes a discharge chute, the discharge chute is installed on the operation table through a spring, and the cooperation arranged on the discharge chute enables the cut plastic particles to be screened in the sieve hopper by vibration screening, and plastic particles of different particle sizes are conveyed to different processes through three chutes of the discharge chute.

[0004] The above plastic granulation machine cuts the cured strip-shaped plastic into plastic particles through the cooperation between the rotating cutting roller and the diversion cover, but there are the following deficiencies: First, when the above plastic granulation machine transports the strip-shaped plastic, the strip-shaped plastic is prone to deviation, which is not conducive to subsequent cutting into plastic particles. In addition, the cutting roller is of a V-shaped structure, and the cut plastic particles are easily stuck on the cutting roller, thereby affecting the subsequent cutting of the strip-shaped plastic. Therefore, we propose a plastic granulation machine capable of screening plastic particles. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide a plastic granulation machine capable of screening plastic particles. The strip-shaped plastic is transported to the cutting roller by driving the transmission rod to rotate through a belt; the limiting groove limits the strip-shaped plastic to prevent deviation during the transmission process; while the rotating shaft rotates, it drives the cutting roller to cut the strip-shaped plastic into plastic particles, and then drives one end of the ejecting rod to slide onto the convex block and extend to eject the particles stuck on the cutting roller to clean the cutting roller.

[0006] To achieve the above object, the present invention provides the following technical solutions: A plastic granulator capable of screening plastic particles, comprising an extruder, a cooling tank, a cutting mechanism and a screening mechanism; the cutting mechanism includes: a working frame; a rotating shaft rotatably arranged on the working frame; a cutting roller mounted on the rotating shaft; a guiding and transmitting assembly for transmitting materials; a jacking and cleaning assembly for cleaning the cutting roller; and a driving assembly for driving the rotating shaft to rotate.

[0007] The jacking and cleaning assembly includes: a support rod arranged inside the cutting roller, multiple groups of first sliding grooves and multiple groups of buffer grooves are formed inside the cutting roller, a jacking rod slidably arranged inside the first sliding groove; a convex block mounted on the support rod, one end of the jacking rod abuts against the support rod and the convex block; an elastic connecting piece sleeved outside the jacking rod is arranged inside the buffer groove, a resisting plate is mounted on the jacking rod, and the elastic connecting piece abuts against the resisting plate.

[0008] A plurality of air spraying holes are formed at the top of the jacking rod, and a flow groove is formed inside the jacking rod; a plurality of first air channels and a plurality of second air channels are formed inside the cutting roller, a high-pressure shell is arranged on one side of the cutting roller, and an arc-shaped plate and a flow dividing block are mounted on the working frame.

[0009] The driving assembly includes: a first rotary driving member mounted on the working frame; a driving wheel mounted on the output end of the first rotary driving member; a driven wheel mounted on the rotating shaft; and a transmission belt for driving connection between the driving wheel and the driven wheel.

[0010] The guiding and transmitting assembly includes: a cover plate mounted on the working frame; two transmission rods rotatably arranged on the working frame; a first transmission wheel mounted on one of the transmission rods; a second transmission wheel mounted on the rotating shaft; and a belt for driving connection between the first transmission wheel and the second transmission wheel.

[0011] The screening mechanism includes: a support frame; a rotating rod rotatably arranged on the support frame; a roller frame mounted on the rotating rod; a screen mounted outside the roller frame; the screen includes a screening part, a buffer part and a discharging part; a shielding assembly arranged inside the roller frame; and a strengthening assembly arranged inside the roller frame.

[0012] The shielding component includes: a first rotating rod rotatably disposed within the rotating rod; a first shielding plate mounted on the first rotating rod; a second rotating rod rotatably disposed within the first rotating rod; and a second shielding plate mounted on the second rotating rod.

[0013] A second rotary driving member, a third rotary driving member, and a fourth rotary driving member are mounted on the support frame. A third gear is mounted on the rotating rod, and a first gear is mounted on the first rotating rod. The second rotary driving member drives the second rotating rod to rotate. A second gear is mounted on the output end of the third rotary driving member, and the second gear meshes with the first gear. A fourth gear is mounted on the output end of the fourth rotary driving member, and the fourth gear meshes with the third gear.

[0014] The strengthening component includes: a linear driving member mounted on the support frame; an arc-shaped block mounted on the output end of the linear driving member, with an arc-shaped groove formed therein; a sliding block slidably disposed within the arc-shaped groove; a connecting plate mounted on the sliding block; and an extending plate slidably disposed within the connecting plate.

[0015] A second sliding groove is formed in the connecting plate, and the extending plate is slidably disposed within the second sliding groove. A plurality of movement grooves are formed in the extending plate, and extending rods are slidably disposed within the movement grooves. A first air pipe is provided on the connecting plate and communicates with the second sliding groove. A second air pipe is disposed within the second sliding groove and communicates with the movement grooves. A fifth rotary driving member is mounted on the arc-shaped block, and a fifth gear is mounted on the output end of the fifth rotary driving member. A rack is mounted on the sliding block, and the fifth gear meshes with the rack.

[0016] The beneficial effects of the present invention are as follows: In the present invention, the belt drives the transmission rod to rotate to transport the strip-shaped plastic to the cutting roller. The limiting groove limits the strip-shaped plastic to prevent deviation during transportation. While the rotating shaft rotates, it drives the cutting roller to cut the strip-shaped plastic into plastic particles. Then, one end of the ejecting rod slides to the convex block and extends out to eject the particles stuck on the cutting roller, cleaning the cutting roller.

[0017] When the ejector rod is in the extended state in the present invention, the first air passage groove communicates with the flow groove, and high-pressure gas is ejected along the first air passage groove, the flow groove, and the air injection holes. The multiple air injection holes are arranged at equal angles on the top of the ejector rod to blow away the particles stuck on the cutting roller. The high-pressure gas is ejected from the air injection holes of the leftmost ejector rod. Since the left end of the arc-shaped plate is in contact and closed with the cutting roller, and there is some gap between the right end of the arc-shaped plate and the cutting roller, the air flow ejected from the air injection holes of the ejector rod flows along the cutting roller from left to right, and the flowing high-pressure gas blows away the plastic particles stuck on the cutting roller, enhancing the pneumatic cleaning effect.

[0018] During the rotation of the cutting roller in the present invention, the second air passage groove communicates with the second high-pressure chamber, and high-pressure gas is ejected from the joint → the second high-pressure chamber → the second through groove → the straight groove → the flow groove → the air injection holes towards the arc-shaped plate. The high-pressure air flow flows along the inner wall of the arc-shaped plate and is divided into two paths by the flow dividing block. One path blows towards the strip-shaped plastic to cool it, and the other path blows towards the cutting roller, facilitating the blowing of the cut plastic particles towards the guiding pipe.

[0019] In the present invention, the first baffle plate blocks the plastic particles within the screening part to prevent the plastic particles from flowing into the buffer part when the screening of the plastic particles is not complete. The linear drive member drives the arc-shaped block, the connecting plate, and the extending plate to move into the screening part. The fifth rotary drive member drives the fifth gear to rotate, driving the sliding block to slide within the arc-shaped groove, driving the connecting plate and the extending plate to swing downward, and driving the extending plate to extend and contact the plastic particles within the screening part. The linear drive member drives the extending plate to push the plastic particles upward, avoiding the accumulation of plastic particles within the screening part at the first baffle plate and enhancing the screening effect of the plastic particles; similarly, the screening effect of plastic particles within the buffer part can be enhanced. Description of the Drawings

[0020] Figure 1 is the schematic diagram of the first overall structure of the present invention; Figure 2 is the schematic diagram of the second overall structure of the present invention; Figure 3 is the schematic diagram of the cutting mechanism structure of the present invention; Figure 4 is the schematic diagram of the cutting roller structure of the present invention; Figure 5 is the schematic diagram of the support rod and the convex block structure of the present invention; Figure 6 is the schematic diagram of the ejecting and cleaning assembly structure of the present invention; Figure 7 is the schematic diagram of the first air passage groove and the second air passage groove structure of the present invention; Figure 8 is the schematic diagram of the arc-shaped plate and the flow dividing block structure of the present invention; Figure 9 is the schematic diagram of the arc-shaped plate and the cutting roller structure of the present invention; Figure 10 Schematic diagram of the cutting roller and the first sliding groove structure of the present invention; Figure 11 Schematic diagram of the high-pressure shell structure of the present invention; Figure 12 Schematic diagram of the bump structure of the present invention; Figure 13 Schematic diagram of the screening mechanism structure of the present invention; Figure 14 For the present invention Figure 13 Enlarged schematic diagram at position A; Figure 15 Schematic diagram of the drum frame and the screen structure of the present invention; Figure 16 Schematic diagram of the reinforcement component structure of the present invention; Figure 17 For the present invention Figure 16 Enlarged schematic diagram at position B; Figure 18 Schematic diagram of the connecting plate and the extending plate structure of the present invention; Figure 19 Schematic diagram of the blanking shell and the guiding shell structure of the present invention.

[0021] The reference numerals in this application are as follows: 1, blanking housing; 2, guiding housing; 3, cutting mechanism; 301, working frame; 302, rotating shaft; 303, cutting roller; 3031, first sliding groove; 3032, buffer groove; 3033, first air passage groove; 30331, first through groove; 30332, L-shaped groove; 3034, second air passage groove; 30341, second through groove; 30342, straight groove; 31, guiding and conveying assembly; 311, cover plate; 3111, limiting groove; 312, conveying rod; 313, first driving wheel; 314, second driving wheel; 315, belt; 32, ejecting and cleaning assembly; 320, fixing plate; 321, supporting rod; 322, ejecting rod; 3221, air spraying hole; 3222, flow groove; 323, convex block; 3231, extension part; 324, elastic connecting piece; 325, resisting plate; 326, high-pressure housing; 3260, joint; 3261, first high-pressure chamber; 3262, second high-pressure chamber; 327, arc plate; 328, flow dividing block; 33, driving assembly; 331, first rotary driving member; 332, driving wheel; 333, driven wheel; 334, transmission belt; 4, screening mechanism; 401, supporting frame; 402, rotating rod; 403, roller frame; 404, screen; 4041, screening part; 4042, buffer part; 4043, discharging part; 41, shielding assembly; 411, first rotating rod; 412, first shielding plate; 413, second rotating rod; 414, second shielding plate; 415, second rotary driving member; 416, third rotary driving member; 417, fourth rotary driving member; 418, third gear; 419, first gear; 42, strengthening assembly; 420, second gear; 421, fourth gear; 422, arc block; 4221, arc groove; 423, sliding block; 424, connecting plate; 4241, second sliding groove; 425, extending plate; 4251, movement groove; 426, extending rod; 427, linear driving member; 428, first air pipe; 429, second air pipe; 430, fifth rotary driving member; 431, fifth gear; 432, rack; 5, guiding pipe. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] Embodiment 1: Figures 1-19 As shown, this embodiment provides a plastic granulator capable of screening plastic particles, including an extruder, a cooling trough, a cutting mechanism 3 and a screening mechanism 4; wherein the extruder and the cooling trough are prior art and will not be described in detail here; The cutting mechanism 3 includes: a working frame 301; a rotating shaft 302, which is rotatably arranged on the working frame 301; a cutting roller 303, which is installed on the rotating shaft 302; a guide transmission component 31, which transmits materials; an ejection cleaning component 32, which cleans the cutting roller 303; a driving component 33, which drives the rotating shaft 302 to rotate, and a guide tube 5 is installed on the working frame 301.

[0026] The guide transmission component 31 includes: a cover plate 311, which is installed on the workbench 301; a transmission rod 312, two transmission rods 312 are rotatably arranged on the workbench 301; a first transmission wheel 313, which is installed on one of the transmission rods 312; a second transmission wheel 314, which is installed on the rotating shaft 302; a belt 315, the first transmission wheel 313 and the second transmission wheel 314 are connected by the belt 315, and a sixth gear (not shown in the figure) can be set at one end of the transmission rod 312, and the two sixth gears are meshed to make the two transmission rods 312 turn in opposite directions, which is beneficial to the transmission of the strip plastic.

[0027] The driving assembly 33 includes: a first rotary driving member 331, which is installed on the working frame 301; a driving wheel 332, which is installed at the output end of the first rotary driving member 331; a driven wheel 333, which is installed on the rotating shaft 302; and a transmission belt 334, through which the driving wheel 332 and the driven wheel 333 are drivingly connected.

[0028] The ejecting and cleaning assembly 32 includes: a support rod 321, which is arranged inside the cutting roller 303. Multiple groups of first sliding grooves 3031 and multiple groups of buffer grooves 3032 are formed inside the cutting roller 303. An ejecting rod 322 is slidably arranged inside the first sliding groove 3031; a convex block 323, which is installed on the support rod 321. One end of the ejecting rod 322 abuts against the support rod 321 and the convex block 323; an elastic connecting member 324 sleeved outside the ejecting rod 322 is arranged inside the buffer groove 3032. A resisting plate 325 is installed on the ejecting rod 322, and the elastic connecting member 324 abuts against the resisting plate 325; the support rod 321 is connected to the working frame 301 through a fixing plate 320.

[0029] In this embodiment, the extruder melts and extrudes plastics. The strip-shaped molten plastics pass through between the two transmission rods 312 after being cooled and solidified in the cooling tank and then penetrate through the limiting groove 3111. The first rotary driving member 331 drives the rotating shaft 302 to rotate through the transmission belt 334, and drives the transmission rod 312 to rotate through the belt 315 to transmit the strip-shaped plastics to the cutting roller 303; the limiting groove 3111 limits the strip-shaped plastics to prevent the strip-shaped plastics from deviating during transmission; While the rotating shaft 302 rotates, it drives the cutting roller 303 to cut the strip-shaped plastics into plastic particles. The cut plastic particles are transmitted into the screening mechanism 4 along the guiding pipe 5 for screening; In this embodiment, under the elastic force of the elastic connecting member 324, one end of the ejecting rod 322 is driven to abut against the support rod 321 and the convex block 323. When one end of the ejecting rod 322 abuts against the support rod 321, the ejecting rod 322 retracts into the first sliding groove 3031. When one end of the ejecting rod 322 abuts against the convex block 323, the ejecting rod 322 extends out of the first sliding groove 3031; During the rotation of the cutting roller 303, the strip-shaped plastics are cut into plastic particles, and then one end of the ejecting rod 322 is driven to slide onto the convex block 323 and then the ejecting rod 322 is driven to extend out, so as to eject the particles stuck on the cutting roller 303 and clean the cutting roller 303.

[0030] The top of the ejector rod 322 is provided with a plurality of air injection holes 3221, and a flow groove 3222 is arranged inside the ejector rod 322; a plurality of first air channels 3033 and a plurality of second air channels 3034 are arranged inside the cutting roller 303, a high-pressure housing 326 is arranged on one side of the cutting roller 303, an arc plate 327 and a flow dividing block 328 are installed on the working frame 301, the first air channel 3033 includes a first through groove 30331 and a plurality of L-shaped grooves 30332, and the second air channel 3034 includes a second through groove 30341 and a plurality of straight grooves 30342. The high-pressure housing 326 is provided with a connector 3260, a first high-pressure chamber 3261 and a second high-pressure chamber 3262.

[0031] In this embodiment, when the ejector rod 322 is in the extended state, the first air channel 3033 is communicated with the flow groove 3222, and the high-pressure gas is ejected along the first air channel 3033, the flow groove 3222, and the air injection holes 3221. The plurality of air injection holes 3221 are arranged at equal angles on the top of the ejector rod 322 to blow away the particles stuck on the cutting roller 303; The air path is: connector 3260 → first high-pressure chamber 3261 → first through groove 30331 → L-shaped groove 30332 → flow groove 3222 → air injection hole 3221; One end of the convex block 323 is provided with an extension portion 3231. When the ejector rod 322 at the leftmost end (as Figure 9 shown) is located on the extension portion 3231, the ejector rod 322 is in the extended state, and the remaining ejector rods 322 in the same row (in the X direction) are retracted into the first sliding groove 3031. At this time, the high-pressure gas is ejected from the air injection holes 3221 of the leftmost ejector rod 322. Since the left end of the arc plate 327 is in contact with and closes the cutting roller 303, and there is a certain gap between the right end of the arc plate 327 and the cutting roller 303, the airflow ejected from the air injection holes 3221 of the ejector rod 322 flows along the cutting roller 303 from left to right (as Figure 9 shown by the arrow direction), and the flowing high-pressure gas blows away the plastic particles stuck on the cutting roller 303 to enhance the pneumatic cleaning effect.

[0032] It should be noted that when the ejector rod 322 is in the extended state, the first air channel 3033 is communicated with the flow groove 3222. When the ejector rod 322 is retracted into the first sliding groove 3031, the second air channel 3034 is communicated with the flow groove 3222; during the rotation of the cutting roller 303, when the second air channel 3034 is communicated with the second high-pressure chamber 3262, the high-pressure gas is ejected from the connector 3260 → second high-pressure chamber 3262 → second through groove 30341 → straight groove 30342 → flow groove 3222 → air injection hole 3221 towards the arc plate 327. The high-pressure airflow flows along the inner wall of the arc plate 327 and is divided into two paths by the flow dividing block 328. One path blows towards the strip-shaped plastic to cool it, and the other path blows towards the cutting roller 303 to facilitate blowing the cut plastic particles towards the guide pipe 5; There is a gap between the top of the first sliding groove 3031 and the ejector rod 322, which facilitates the gas to be sprayed from the air injection hole 3221 towards the arc-shaped plate 327. The contact plate 325 and the buffer groove 3032 are oval to prevent the ejector rod 322 from rotating within the first sliding groove 3031.

[0033] Embodiment 2: As Figures 1-19 shown, the components that are the same or corresponding to those in Embodiment 1 adopt the corresponding reference numerals in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. The differences between this Embodiment 2 and Embodiment 1 are as follows: In this embodiment, the screening mechanism 4 includes: a support frame 401; a rotating rod 402 rotatably provided on the support frame 401; a roller frame 403 mounted on the rotating rod 402; a screen 404 mounted on the outer side of the roller frame 403; the screen 404 includes a screening part 4041, a buffer part 4042, and a discharge part 4043; a shielding assembly 41 provided in the roller frame 403; and a strengthening assembly 42 provided in the roller frame 403. The filter hole sizes of the screening part 4041, the buffer part 4042, and the discharge part 4043 gradually increase, and a blanking shell 1 and a guiding shell 2 are provided below the support frame 401.

[0034] In this embodiment, the plastic particles are transported along the guiding pipe 5 into the screening mechanism 4 for screening; the screen 404 screens the plastic particles. The plastic particles with the smallest size pass through the filter holes of the screening part 4041 and fall into the blanking shell 1 below; the plastic particles with medium size pass through the filter holes of the buffer part 4042 and fall into the blanking shell 1 below; the plastic particles with large size pass through the filter holes of the discharge part 4043 and fall into the blanking shell 1 below; for some plastic particles with extremely large size that cannot pass through the filter holes of the screen 404, they will be transported downward along the inclined screen 404 into the guiding shell 2.

[0035] The shielding assembly 41 includes: a first rotating rod 411 rotatably provided in the rotating rod 402; a first shielding plate 412 mounted on the first rotating rod 411; a second rotating rod 413 rotatably provided in the first rotating rod 411; and a second shielding plate 414 mounted on the second rotating rod 413.

[0036] A second rotation driving member 415, a third rotation driving member 416, and a fourth rotation driving member 417 are installed on the support frame 401. A third gear 418 is installed on the rotating rod 402, and a first gear 419 is installed on the first rotating rod 411. The second rotation driving member 415 drives the second rotating rod 413 to rotate. A second gear 420 is installed at the output end of the third rotation driving member 416. The second gear 420 meshes with the first gear 419. A fourth gear 421 is installed at the output end of the fourth rotation driving member 417. The fourth gear 421 meshes with the third gear 418.

[0037] The enhancement component 42 includes: a linear driving member 427, which is installed on the support frame 401; an arc-shaped block 422, which is installed at the output end of the linear driving member 427. An arc-shaped groove 4221 is formed in the arc-shaped block 422; a sliding block 423, which is slidably arranged in the arc-shaped groove 4221; a connecting plate 424, which is installed on the sliding block 423; and an extending plate 425, which is slidably arranged in the connecting plate 424.

[0038] A second sliding groove 4241 is formed in the connecting plate 424. The extending plate 425 is slidably arranged in the second sliding groove 4241. A plurality of movement grooves 4251 are formed in the extending plate 425. An extending rod 426 is slidably arranged in the movement grooves 4251. A first air pipe 428 is arranged on the connecting plate 424. The first air pipe 428 communicates with the second sliding groove 4241. A second air pipe 429 is arranged in the second sliding groove 4241. The second air pipe 429 communicates with the movement grooves 4251. A fifth rotation driving member 430 is installed on the arc-shaped block 422. A fifth gear 431 is installed at the output end of the fifth rotation driving member 430. A rack 432 is installed on the sliding block 423. The fifth gear 431 meshes with the rack 432.

[0039] In this embodiment, the first baffle 412 blocks the plastic particles in the screening part 4041 to prevent the plastic particles from flowing into the buffer part 4042 when the screening of the plastic particles is not complete. The linear driving member 427 drives the arc-shaped block 422, the connecting plate 424, and the extending plate 425 to move into the screening part 4041. The fifth rotation driving member 430 drives the fifth gear 431 to rotate, driving the sliding block 423 to slide in the arc-shaped groove 4221, driving the connecting plate 424 and the extending plate 425 to swing downward, driving the extending plate 425 to extend and contact the plastic particles in the screening part 4041. The linear driving member 427 drives the extending plate 425 to push the plastic particles upward, preventing the plastic particles in the screening part 4041 from accumulating at the first baffle 412 and enhancing the screening effect of the plastic particles. Similarly, the screening effect of the plastic particles in the buffer part 4042 can be enhanced. The fourth rotation driving member 417 drives the fourth gear 421 and the third gear 418 to rotate, driving the rotating rod 402, the roller frame 403, and the screen 404 to rotate for screening plastic particles; the third rotation driving member 416 drives the first rotating rod 411 to rotate, driving the first baffle 412 to rotate upward; facilitating the plastic particles in the screening part 4041 to flow towards the buffer part 4042; the second rotation driving member 415 drives the second rotating rod 413 to rotate, driving the second baffle 414 to rotate upward, facilitating the plastic particles in the buffer part 4042 to flow towards the discharge part 4043.

[0040] In this embodiment, high-pressure gas enters the movement groove 4251 along the second air pipe 429, driving the protruding rod 426 to output and insert into the filter holes of the screening part 4041, the buffer part 4042, and the discharge part 4043 (cooperating with the linear driving member 427 to move), to clean the filter holes of the screening part 4041, the buffer part 4042, and the discharge part 4043.

[0041] The first air pipe 428 and the second air pipe 429 are respectively communicated with the gas source. The first air pipe 428 introduces high pressure into the second sliding groove 4241 to drive the protruding plate 425 to extend, and introduces negative pressure to drive the protruding plate 425 to retract. This is a conventional technical means in the art and will not be described in detail here. The first air pipe 428 and the second air pipe 429 are spirally wound outside the output shaft of the linear driving member 427.

[0042] Working steps Step 1, granulation process: The extruder melts the plastic and extrudes it. The strip-shaped molten plastic passes through the cooling tank to be cooled and solidified, then passes through between the two transmission rods 312 and penetrates the limiting groove 3111. The first rotation driving member 331 drives the rotating shaft 302 to rotate through the transmission belt 334, and drives the transmission rod 312 to rotate through the belt 315 to transport the strip-shaped plastic to the cutting roller 303; the limiting groove 3111 limits the strip-shaped plastic to prevent it from deviating during transmission; While the rotating shaft 302 rotates, it drives the cutting roller 303 to cut the strip-shaped plastic into plastic particles. The cut plastic particles are transported along the guide pipe 5 to the screening mechanism 4 for screening; Step 2, ejecting and cleaning process: Under the elastic force of the elastic connecting member 324, it drives one end of the ejecting rod 322 to abut against the support rod 321 and the convex block 323. When one end of the ejecting rod 322 abuts against the support rod 321, the ejecting rod 322 retracts in the first sliding groove 3031. When one end of the ejecting rod 322 abuts against the convex block 323, the ejecting rod 322 extends out of the first sliding groove 3031; During the rotation of the cutting roller 303, the strip-shaped plastic is cut into plastic particles, and then it drives one end of the ejecting rod 322 to slide onto the convex block 323 and extend, ejecting the particles stuck on the cutting roller 303 to clean the cutting roller 303; Step 3, Pneumatic cleaning process: When the ejector rod 322 is in the extended state, the first air passage groove 3033 is communicated with the flow groove 3222, and the high-pressure gas is ejected along the first air passage groove 3033, the flow groove 3222, and the air injection holes 3221. The multiple air injection holes 3221 are arranged at equal angles on the top of the ejector rod 322 to blow away the particles stuck on the cutting roller 303; The air path direction is: joint 3260 → first high-pressure chamber 3261 → first through groove 30331 → L-shaped groove 30332 → flow groove 3222 → air injection holes 3221; One end of the convex block 323 is provided with an extension part 3231. When the ejector rod 322 at the leftmost end (as Figure 9 shown) is located on the extension part 3231, the ejector rod 322 is in the extended state, and the other ejector rods 322 in the same row (X direction) are retracted into the first sliding groove 3031. At this time, the air injection holes 3221 of the leftmost ejector rod 322 eject high-pressure gas. Since the left end of the arc-shaped plate 327 is in close contact with the cutting roller 303 to be closed, and there is some gap between the right end of the arc-shaped plate 327 and the cutting roller 303, the air flow ejected from the air injection holes 3221 of the ejector rod 322 flows along the cutting roller 303 from left to right (as Figure 9 shown by the arrow direction in the figure), and the flowing high-pressure gas blows away the plastic particles stuck on the cutting roller 303, enhancing the pneumatic cleaning effect; Step 4, Cooling and guiding process: When the ejector rod 322 is in the extended state, the first air passage groove 3033 is communicated with the flow groove 3222. When the ejector rod 322 is retracted into the first sliding groove 3031, the second air passage groove 3034 is communicated with the flow groove 3222; during the rotation of the cutting roller 303, the second air passage groove 3034 is communicated with the second high-pressure chamber 3262, and the high-pressure gas is ejected from the joint 3260 → second high-pressure chamber 3262 → second through groove 30341 → straight groove 30342 → flow groove 3222 → air injection holes 3221 towards the arc-shaped plate 327. The high-pressure air flow flows along the inner wall of the arc-shaped plate 327 and is divided into two paths by the flow dividing block 328. One path blows towards the strip-shaped plastic to cool it, and the other path blows towards the cutting roller 303, facilitating blowing the cut plastic particles towards the guiding pipe 5. A switch can be set in the guiding pipe 5 to control the opening and closing of the guiding pipe 5; Step 5, Screening process: The plastic particles are transmitted along the guiding pipe 5 to the screening mechanism 4 for screening; the sieve mesh 404 screens the plastic particles. The plastic particles with the smallest size pass through the filter holes of the screening part 4041 and fall into the lower blanking shell 1; the plastic particles with medium size pass through the filter holes of the buffer part 4042 and fall into the lower blanking shell 1; the plastic particles with large size pass through the filter holes of the discharge part 4043 and fall into the lower blanking shell 1; for some plastic particles with extremely large size that cannot pass through the filter holes of the sieve mesh 404, they will be transmitted downward along the inclined sieve mesh 404 into the guiding shell 2; Step Six, Enhanced Screening Process: The first baffle 412 blocks the plastic particles within the screening section 4041 to prevent the plastic particles from flowing into the buffer section 4042 when the screening of the plastic particles is incomplete. The linear drive 427 drives the arc-shaped block 422, the connecting plate 424, and the extending plate 425 to move into the screening section 4041; The fifth rotary drive 430 drives the fifth gear 431 to rotate, driving the sliding block 423 to slide within the arc-shaped groove 4221, driving the connecting plate 424 and the extending plate 425 to swing downward, driving the extending plate 425 to extend and contact the plastic particles within the screening section 4041, and the linear drive 427 drives the extending plate 425 to push the plastic particles upward, preventing the plastic particles within the screening section 4041 from accumulating at the first baffle 412 and enhancing the screening effect of the plastic particles; similarly, the screening effect of the plastic particles within the buffer section 4042 can be enhanced; Step Seven, Cleaning Effect: When screening is not in progress, high-pressure gas enters the movement groove 4251 along the second air pipe 429, driving the output of the extending rod 426 to insert into the filter holes of the screening section 4041, the buffer section 4042, and the discharge section 4043 (with the cooperation of the linear drive 427 for movement), to clean the filter holes of the screening section 4041, the buffer section 4042, and the discharge section 4043.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plastic granulator capable of screening plastic particles, characterized in that, It includes an extruder, a cooling tank, a cutting mechanism (3) and a screening mechanism (4); The cutting mechanism (3) includes: A working frame (301); A rotating shaft (302) rotatably arranged on the working frame (301); A cutting roller (303) installed on the rotating shaft (302); A guiding and conveying assembly (31) for conveying materials; An ejecting and cleaning assembly (32) for cleaning the cutting roller (303); A driving assembly (33) for driving the rotating shaft (302) to rotate.

2. A plastic granulator capable of screening plastic particles according to claim 1, characterized in that, The ejecting and cleaning assembly (32) includes: A support rod (321) arranged inside the cutting roller (303), and multiple groups of first sliding grooves (3031) and multiple groups of buffer grooves (3032) are formed inside the cutting roller (303); An ejecting rod (322) slidably arranged in the first sliding groove (3031); A convex block (323) installed on the support rod (321), and one end of the ejecting rod (322) abuts against the support rod (321) and the convex block (323); An elastic connecting piece (324) sleeved outside the ejecting rod (322) is arranged in the buffer groove (3032), a resisting plate (325) is installed on the ejecting rod (322), and the elastic connecting piece (324) abuts against the resisting plate (325).

3. A plastic granulator capable of screening plastic particles according to claim 2, characterized in that, Multiple air spraying holes (3221) are formed at the top of the ejecting rod (322), and a flow groove (3222) is formed inside the ejecting rod (322); Multiple first air flow grooves (3033) and multiple second air flow grooves (3034) are formed inside the cutting roller (303), a high-pressure shell (326) is arranged on one side of the cutting roller (303), an arc-shaped plate (327) and a flow dividing block (328) are installed on the working frame (301), and one end of the convex block (323) is provided with an extension part (3231); A first high-pressure cavity (3261) and a second high-pressure cavity (3262) are formed on the high-pressure shell (326), the first air flow groove (3033) includes a first through groove (30331) and multiple L-shaped grooves (30332), and the second air flow groove (3034) includes a second through groove (30341) and multiple straight grooves (30342).

4. A plastic granulator capable of screening plastic particles according to claim 3, characterized in that, The driving assembly (33) includes: A first rotation driving member (331) installed on the working frame (301); A driving wheel (332) installed at the output end of the first rotation driving member (331); A driven wheel (333) installed on the rotating shaft (302); A transmission belt (334) for driving connection between the driving wheel (332) and the driven wheel (333).

5. A plastic granulator capable of screening plastic particles according to claim 4, wherein, The guiding and conveying assembly (31) includes: Cover plate (311), the cover plate (311) is installed on the working frame (301), and a plurality of limiting grooves (3111) are provided in the cover plate (311); Transfer rods (312), two of the transfer rods (312) are rotatably arranged on the working frame (301); First transmission wheel (313), the first transmission wheel (313) is installed on one of the transfer rods (312); Second transmission wheel (314), the second transmission wheel (314) is installed on the rotating shaft (302); Belt (315), the first transmission wheel (313) and the second transmission wheel (314) are drivingly connected by the belt (315).

6. The plastic granulator capable of screening plastic particles according to claim 5, characterized in that, The screening mechanism (4) includes: Support frame (401); Rotating rod (402), the rotating rod (402) is rotatably arranged on the support frame (401); Drum frame (403), the drum frame (403) is installed on the rotating rod (402); Sieve mesh (404), the sieve mesh (404) is installed outside the drum frame (403); the sieve mesh (404) includes a sieve part (4041), a buffer part (4042), and a discharge part (4043); Blocking assembly (41), the blocking assembly (41) is arranged inside the drum frame (403); Reinforcing assembly (42), the reinforcing assembly (42) is arranged inside the drum frame (403).

7. A plastic granulator capable of screening plastic particles according to claim 6, characterized in that, The blocking assembly (41) includes: First rotating rod (411), the first rotating rod (411) is rotatably arranged inside the rotating rod (402); First blocking plate (412), the first blocking plate (412) is installed on the first rotating rod (411); Second rotating rod (413), the second rotating rod (413) is rotatably arranged inside the first rotating rod (411); Second blocking plate (414), the second blocking plate (414) is installed on the second rotating rod (413).

8. A plastic granulator capable of screening plastic particles according to claim 7, characterized in that, A second rotation driving member (415), a third rotation driving member (416), and a fourth rotation driving member (417) are installed on the support frame (401), a third gear (418) is installed on the rotating rod (402), a first gear (419) is installed on the first rotating rod (411), the second rotation driving member (415) drives the second rotating rod (413) to rotate, a second gear (420) is installed at the output end of the third rotation driving member (416), the second gear (420) meshes with the first gear (419), a fourth gear (421) is installed at the output end of the fourth rotation driving member (417), and the fourth gear (421) meshes with the third gear (418).

9. A plastic granulator capable of screening plastic particles according to claim 8, characterized in that, The reinforcing assembly (42) includes: Linear driving member (427), the linear driving member (427) is installed on the support frame (401); Arc-shaped block (422), the arc-shaped block (422) is installed at the output end of the linear driving member (427), and an arc-shaped groove (4221) is provided in the arc-shaped block (422); Slider block (423), the slider block (423) is slidably arranged in the arc-shaped groove (4221); Connecting plate (424), the connecting plate (424) is installed on the slider block (423); Extension plate (425), the extension plate (425) is slidably arranged in the connecting plate (424).

10. A plastic granulator capable of screening plastic particles according to claim 9, characterized in that, A second sliding groove (4241) is formed in the connecting plate (424), and the extension plate (425) is slidably arranged in the second sliding groove (4241); A plurality of movement grooves (4251) are formed in the extension plate (425), an extension rod (426) is slidably arranged in the movement grooves (4251), a first air pipe (428) is arranged on the connecting plate (424), and the first air pipe (428) communicates with the second sliding groove (4241); A second air pipe (429) is arranged in the second sliding groove (4241), and the second air pipe (429) communicates with the movement grooves (4251); A fifth rotation driving member (430) is installed on the arc-shaped block (422), a fifth gear (431) is installed at the output end of the fifth rotation driving member (430), a rack (432) is installed on the slider block (423), and the fifth gear (431) and the rack (432) are meshed with each other.

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