阅读说明：本技术 一种塑料三级粉碎回收系统 (Recovery system is smashed to plastics tertiary ) 是由 沈宜民 于 2021-09-26 设计创作，主要内容包括：本发明涉及塑料加工设备技术领域,尤其是公开了一种塑料三级粉碎回收系统,包括初级粉碎机,所述初级粉碎机的出料端通过真空管道与初级分筛箱的入料端连通,所述初级分筛箱的出料端固定有第一风筒,所述第一风筒通过真空管道与二级粉碎机的入料端连通。有益效果在于：结构设置,通过真空风管将三个粉碎机和三个分筛箱连在一起,通过多级粉碎和分筛可以快速将塑料进行粉碎,提高塑料的粉碎效率和效果；全部采用高速风流作为动力实现塑料的传输,传输效果好,速度快,方便管理,人工消耗少,而且可以避免塑料颗粒掉落到工作环境中,保证清洁卫生；在粉碎的过程中对空气中的灰尘进行过滤处理,减少环境污染,环保效果好。(The invention relates to the technical field of plastic processing equipment, and particularly discloses a plastic three-stage crushing and recycling system which comprises a primary crusher, wherein the discharge end of the primary crusher is communicated with the feed end of a primary grade sieve box through a vacuum pipeline, a first air duct is fixed at the discharge end of the primary grade sieve box, and the first air duct is communicated with the feed end of a secondary crusher through a vacuum pipeline. Has the advantages that: the structure is arranged, the three crushers and the three screening boxes are connected together through the vacuum air pipes, plastics can be crushed rapidly through multi-stage crushing and screening, and the crushing efficiency and effect of the plastics are improved; the plastic conveying device has the advantages that high-speed airflow is completely adopted as power to realize plastic conveying, the conveying effect is good, the speed is high, the management is convenient, the labor consumption is low, plastic particles can be prevented from falling into a working environment, and the cleanness and the sanitation are guaranteed; the dust in the air is filtered in the crushing process, so that the environmental pollution is reduced, and the environment-friendly effect is good.)

1. The utility model provides a recovery system is smashed to tertiary of plastics which characterized in that: comprises a primary crusher (1), the discharge end of the primary crusher (1) is communicated with the feed end of a primary screening box (2) through a vacuum pipeline, the discharge end of the primary screening box (2) is fixed with a first air duct (3), the first air duct (3) is communicated with the feed end of a secondary crusher (4) through a vacuum pipeline, the discharge end of the secondary crusher (4) is communicated with the feed end of a secondary screening box (5) through a vacuum pipeline, the discharge end of the secondary screening box (5) is fixed with a second air duct (6), the second air duct (6) is communicated with the feed end of a tertiary crusher (7) through a vacuum pipeline, the discharge end of the tertiary crusher (7) is communicated with the feed end of a third air duct (9) through a vacuum pipeline, the third air duct (9) is fixed above the feed end of a tertiary screening box (8), the discharge end of third dryer (9) with the pan feeding end intercommunication of three grades of sieve case (8), third dryer (9) upper end has dust removal case (10) through the pipeline intercommunication, first grade sieve case (2) of dividing two grades of sieve case (5) all seted up out dirt hole (15) on three grades of sieve case (8) upper surface, all go out dirt hole (15) pass through dust leg (11) with dust removal case (10) intercommunication.

2. The three-stage plastic pulverizing and recycling system according to claim 1, wherein: elementary rubbing crusher (1) is including mount (101), mount (101) internal fixation has crushing case (103), it articulates and is fixed with upper cover (106) to smash case (103) top, it is fixed with rubbing crusher bistrique (102) through the bearing frame to smash case (103) upper end, upper cover (106) side of going up is fixed with first income hopper (105), it is fixed with draught fan (104) to smash case (103) downside side.

3. The three-stage plastic pulverizing and recycling system as claimed in claim 2, wherein: the symmetry is fixed with two hydraulic cylinder (107) that uncap on upper cover (106) lateral wall, uncap hydraulic cylinder (107) both ends are fixed through the round pin axle respectively smash case (103) with on upper cover (106) lateral wall, be fixed with hydraulic oil pump (108), hydraulic oil bin (109) and switching lid control switch (110) on mount (101), uncap hydraulic cylinder (107) hydraulic oil pump (108) hydraulic oil bin (109) pass through the oil pipe intercommunication, switching lid control switch (110) with hydraulic oil pump (108) electricity is connected.

4. The three-stage plastic pulverizing and recycling system as claimed in claim 2, wherein: the primary crusher (1), the secondary crusher (4), the tertiary crusher (7) are hammer mill, the primary crusher (1), the secondary crusher (4), the hammer interval on the grinding head (102) of the tertiary crusher (7) reduces in proper order, the secondary crusher (4), the feeding end of the tertiary crusher (7) is hinged with a rotatable reverse flow baffle.

5. The three-stage plastic pulverizing and recycling system as claimed in claim 4, wherein: the primary screening box (2) comprises a first box body (201), a plurality of first funnels (207) are fixed below the first box body (201) side by side, a first material recovery branch pipe (208) is fixed at the lower end of each first funnel (207), the first material recovery branch pipe (208) is communicated with a feeding end of a material recovery fan (14) through a material recovery main pipe (13), a discharging end of the material recovery fan (14) is communicated with a material recovery box (12), two groups of four supporting wheels (205) are rotatably installed at the lower end inside the first box body (201), the same group of two supporting wheels (205) are in transmission connection through universal joints (209), a first rotating motor (206) in transmission connection with the supporting wheels (205) is fixed at one end of the first box body (201), and a first screen (203) is placed on the supporting wheels (205) in a rotating manner, the end part of the first screen (203) corresponds to the position of the supporting wheel (205) and is fixedly provided with a pipe sleeve, one end of the first screen (203) is low, the other end of the first screen (203) is high in inclination, a first feeding hopper (105) communicated with the primary crusher (1) is fixed at the end, close to the side wall of the first box body (201), of the first screen (203), and a first discharging fan (202) communicated with the first air duct (3) is fixed at the end, close to the cross-low end of the first screen (203), of the first box body (201).

6. The three-stage plastic pulverizing and recycling system according to claim 5, wherein: the second-level screening box (5) comprises a second box body (501), a plurality of second hoppers (507) are fixed below the second box body (501) side by side, a second material recovery branch pipe (508) is fixed at the lower end of each second hopper (507), the second material recovery branch pipe (508) is communicated with the material recovery fan (14) through the material recovery main pipe (13), a first fixed rotating shaft (504) is rotatably installed in the second box body (501), a second screen (503) is fixed on the first fixed rotating shaft (504) through a plurality of supporting steel rings, a second rotating motor (506) in transmission connection with the first fixed rotating shaft (504) is fixed at one end of the second box body (501), a first guide pipe (505) communicated with the second-level pulverizer (4) is fixed at one end of the second rotating motor (506) installed in the second box body (501), and a second discharging fan (502) communicated with the second air duct (6) is fixed at the other end of the second box body (501).

7. The three-stage plastic pulverizing and recycling system as claimed in claim 6, wherein: the three-stage sieving box (8) comprises a third box body (801), a plurality of third hoppers (807) are fixed below the third box body (801) side by side, a third material recovery branch pipe (808) is fixed at the lower end of the third hopper (807), the third material recovery branch pipe (808) is communicated with the material recovery fan (14) through the material recovery main pipe (13), a second fixed rotating shaft (805) is rotatably installed in the third box body (801), a third screen (803) is fixed on the second fixed rotating shaft (805) through a plurality of support steel rings, a third rotating motor (806) in transmission connection with the second fixed rotating shaft (805) is fixed at one end of the third box body (801), a second guide pipe (804) communicated with the third air duct (9) is fixed at one end of the third box body (801) where the third rotating motor (806) is installed, and a third discharging fan (802) is fixed at the other end of the third box body (801).

8. The three-stage plastic pulverizing and recycling system as claimed in claim 7, wherein: and the third discharging fan (802) is communicated with any one of the primary crusher (1), the secondary crusher (4) and the tertiary crusher (7) through pipelines.

Technical Field

The invention relates to the technical field of plastic processing equipment, in particular to a plastic three-stage crushing and recycling system.

Background

At present, plastics may be ubiquitous. Disposable plastic containers have a large proportion of the waste that is discarded by everyone every day. These plastics are not generally biodegradable and they decompose into toxic substances that penetrate into the ground and groundwater. Fortunately, by recycling and reusing the plastic, we can avoid the plastic from entering the landfill and not being utilized, and provide a lot of material for manufacturing various new products.

Most of the existing plastic crushers cannot thoroughly crush plastic, a very long time is needed, and the plastic is conveyed by using a forklift, a conveying belt, a spiral auger and the like, so that the working efficiency is low, and the plastic recovery efficiency is influenced.

Disclosure of Invention

The invention provides a plastic three-stage crushing and recycling system for solving the problems.

The technical scheme of the invention is realized as follows:

a plastic three-stage crushing recovery system comprises a primary crusher, wherein the discharge end of the primary crusher is communicated with the feeding end of a primary-stage sieve box through a vacuum pipeline, a first air drum is fixed at the discharge end of the primary-stage sieve box and is communicated with the feeding end of a secondary crusher through a vacuum pipeline, the discharge end of the secondary crusher is communicated with the feeding end of a secondary-stage sieve box through a vacuum pipeline, a second air drum is fixed at the discharge end of the secondary-stage sieve box and is communicated with the feeding end of a third-stage crusher through a vacuum pipeline, the discharge end of the third crusher is communicated with the feeding end of a third air drum through a vacuum pipeline, the third air drum is fixed above the feeding end of a third-stage sieve box, the discharge end of the third air drum is communicated with the feeding end of the third-stage sieve box, and the upper end of the third air drum is communicated with a dust removal box through a pipeline, and the upper surfaces of the primary grade screening box, the secondary grade screening box and the tertiary grade screening box are all provided with dust outlet holes, and all the dust outlet holes are communicated with the dust removal box through dust collection pipes.

Further, primary crusher includes the mount, the mount internal fixation has crushing case, it is articulated to be fixed with the upper cover to smash case top, it is fixed with the rubbing crusher bistrique through the bearing frame to smash case upper end, upper cover top side is fixed with first income hopper, it is fixed with the draught fan to smash case downside side.

Further, the symmetry is fixed with two pneumatic cylinders that uncap on the upper cover lateral wall, uncap the pneumatic cylinder both ends and fix through the round pin axle respectively smash the case with on the upper cover lateral wall, be fixed with hydraulic oil pump, hydraulic oil bin and switching lid control switch on the mount, the pneumatic cylinder that uncaps the hydraulic oil pump the hydraulic oil bin passes through the oil pipe intercommunication, switching lid control switch with the hydraulic oil pump electricity is connected.

Furthermore, the primary crusher, the secondary crusher and the tertiary crusher are all hammer type crushers, the distance between the hammers on the primary crusher, the secondary crusher and the grinding head of the tertiary crusher is reduced in sequence, and the feeding end of the secondary crusher and the feeding end of the tertiary crusher are hinged with rotatable reverse flow baffles.

Further, the primary screening box comprises a first box body, a plurality of first funnels are fixed below the first box body side by side, a first material recovery branch pipe is fixed at the lower end of each first funnel, the first material recovery branch pipe is communicated with the feeding end of a material recovery fan through a material recovery main pipe, the discharging end of the material recovery fan is communicated with a material recovery box, two groups of four supporting wheels are rotatably mounted at the lower end in the first box body, the two supporting wheels in the same group are connected through universal joint transmission, a first rotating motor in transmission connection with the supporting wheels is fixed at one end of the first box body, a first screen is rotatably placed on the supporting wheels, a pipe sleeve is fixed at the position, corresponding to the supporting wheels, of the end part of the first screen, the lower end of the first screen is arranged in a high-inclination manner, a first feeding hopper communicated with the primary crusher is fixed at the side wall of the first box body, close to the higher end of the first screen, and a first discharging fan communicated with the first air duct is fixed at one end, close to the intersection of the first screen, of the side wall of the first box body.

Further, two grades of sieve boxes include the second box, second box below is fixed with a plurality of second funnel side by side, second funnel lower extreme is fixed with second material recovery branch pipe, second material recovery branch pipe passes through the material recovery be responsible for with material recovery fan intercommunication, first fixed rotating shaft is installed to second box internal rotation, be fixed with the second screen cloth through a plurality of support steel ring in the first fixed rotating shaft, second box one end be fixed with the second rotation motor that first fixed rotating shaft transmission is connected, the second box is installed the second rotate the one end of motor be fixed with the first honeycomb duct of second grade rubbing crusher intercommunication, the second box other end be fixed with the second ejection of compact fan of second dryer intercommunication.

Further, three grades of sieve boxes include the third box, third box below is fixed with a plurality of third funnel side by side, third funnel lower extreme is fixed with third material recovery branch pipe, third material recovery branch pipe passes through the material recovery is responsible for with material recovery fan intercommunication, the fixed pivot of second is installed to third box internal rotation, support the steel ring through a plurality of in the fixed pivot of second and be fixed with the third screen cloth, third box one end be fixed with the third rotation motor that the fixed pivot transmission of second is connected, the third box is installed the one end that the third rotated the motor be fixed with the second honeycomb duct of third dryer intercommunication, third box other end is fixed with third ejection of compact fan.

Further, the third discharge fan is communicated with any one of the primary crusher, the secondary crusher and the tertiary crusher through a pipeline.

By adopting the technical scheme, the invention has the beneficial effects that: the structure is arranged, the three crushers and the three screening boxes are connected together through the vacuum air pipes, plastics can be crushed rapidly through multi-stage crushing and screening, and the crushing efficiency and effect of the plastics are improved; the plastic conveying device has the advantages that high-speed airflow is completely adopted as power to realize plastic conveying, the conveying effect is good, the speed is high, the management is convenient, the labor consumption is low, plastic particles can be prevented from falling into a working environment, and the cleanness and the sanitation are guaranteed; the dust in the air is filtered in the crushing process, so that the environmental pollution is reduced, and the environment-friendly effect is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the primary crusher of the present invention;

FIG. 3 is a side view of the primary crusher of the present invention;

FIG. 4 is a front cross-sectional view of the primary screen box of the present invention;

FIG. 5 is a side view of the primary screen box of the present invention;

FIG. 6 is a front view of a secondary crusher of the present invention;

FIG. 7 is a front cross-sectional view of the secondary screen box of the present invention;

FIG. 8 is a side view of the secondary screen box of the present invention;

FIG. 9 is a front view of the three stage shredder of the present invention;

FIG. 10 is a front cross-sectional view of the tertiary screen box of the present invention;

FIG. 11 is a side view of the tertiary screen box of the present invention;

the reference numerals are explained below:

1. a primary crusher; 101. a fixed mount; 102. grinding head of the grinder; 103. a crushing box; 104. an induced draft fan; 105. a first feeding hopper; 106. an upper cover; 107. uncovering the hydraulic cylinder; 108. a hydraulic oil pump; 109. a hydraulic oil storage tank; 110. an opening and closing cover control switch; 2. a primary fraction sieve box; 201. a first case; 202. a first discharge fan; 203. a first screen; 204. a second feeding hopper; 205. a support wheel; 206. a first rotating electric machine; 207. a first hopper; 208. a first material recovery branch pipe; 209. a universal joint; 3. a first air duct; 4. a secondary crusher; 5. a second stage sieve box; 501. a second case; 502. a second discharge fan; 503. a second screen; 504. a first fixed rotating shaft; 505. a first draft tube; 506. a second rotating electric machine; 507. a second hopper; 508. a second material recovery branch pipe; 6. a second air duct; 7. a three-stage pulverizer; 8. a three-stage sieve box; 801. a third box body; 802. a third discharge fan; 803. a third screen; 804. a second draft tube; 805. a second fixed rotating shaft; 806. a third rotating electric machine; 807. a third hopper; 808. a third material recovery branch pipe; 9. a third air duct; 10. a dust removal box; 11. a dust collecting pipe; 12. a material recovery box; 13. a material recovery main pipe; 14. a material recovery fan; 15. and a dust outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figures 1-11, a plastic three-stage crushing and recycling system comprises a primary crusher 1 for primarily crushing plastic, a discharge end of the primary crusher 1 is communicated with a feed end of a primary screening box 2 through a vacuum pipeline, the primary screening box 2 is used for primarily screening plastic to screen plastic blocks meeting the size requirement, a first air duct 3 is fixed at the discharge end of the primary screening box 2, the first air duct 3 is used for reducing the speed of material moving along with wind and facilitating screening, the first air duct 3 is communicated with the feed end of a secondary crusher 4 through a vacuum pipeline, the secondary crusher 4 is used for secondarily crushing plastic, a discharge end of the secondary crusher 4 is communicated with the feed end of the secondary screening box 5 through a vacuum pipeline, the secondary screening box 5 is used for secondarily screening plastic to screen plastic blocks meeting the size requirement, the discharge end of the second grade sieve box 5 is fixed with a second air duct 6, the second air duct 6 is used for reducing the speed of the material moving along with the wind and facilitating the screening, the second air duct 6 is communicated with the feeding end of a third grade crusher 7 through a vacuum pipeline, the third grade crusher 7 is used for carrying out the third crushing on the plastic, the discharge end of the third grade crusher 7 is communicated with the feeding end of a third air duct 9 through a vacuum pipeline, the third air duct 9 is fixed above the feeding end of the third grade sieve box 8, the discharge end of the third air duct 9 is communicated with the feeding end of the third grade sieve box 8, the upper end of the third air duct 9 is communicated with a dust removal box 10 through a pipeline, the third air duct 9 is used for reducing the speed of the material and facilitating the separation of the material and the dust, the upper surfaces of the primary grade sieve box 2, the second grade sieve box 5 and the third grade sieve box 8 are all provided with a hole 15, all the dust holes 15 are communicated with the dust removal box 10 through a dust collection pipe 11, the dust on the plastics is conveniently sent into dust removal case 10 in and is handled, reduces environmental pollution, is provided with dust bag in the dust removal case 10, can reach the effect of environmental protection with wind and dust, dust separation.

In the embodiment, the primary crusher 1 comprises a fixing frame 101, a crushing box 103 is fixed in the fixing frame 101, an upper cover 106 is hinged and fixed above the crushing box 103, a crusher grinding head 102 for crushing plastics is fixed at the upper end of the crushing box 103 through a bearing seat, a first feeding hopper 105 is fixed at the upper side of the upper cover 106 to facilitate the pouring of the plastics, a draught fan 104 is fixed at the lower side of the crushing box 103 to generate suction force to feed the crushed plastics into the primary screening box 2, two uncovering hydraulic cylinders 107 are symmetrically fixed on the side wall of the upper cover 106, two ends of the uncovering hydraulic cylinders 107 are respectively fixed on the side walls of the crushing box 103 and the upper cover 106 through pin shafts, a hydraulic oil pump 108, a hydraulic oil storage box 109 and an opening and closing cover control switch 110 are fixed on the fixing frame 101, the uncovering hydraulic oil pump 107, the hydraulic oil pump 108 and the storage box 109 are communicated through oil pipes, and the opening and closing cover control switch 110 is electrically connected with the hydraulic oil pump 108, the uncovering hydraulic cylinder 107 can be controlled to stretch by the uncovering control switch 110, the upper cover 106 is driven to open and close by the stretching of the uncovering hydraulic cylinder 107, so that the crusher grinding head 102 is convenient to install and maintain, and the motor for driving the crusher grinding head 102 to work is also fixed on the fixed frame 101.

In this embodiment, primary crusher 1, second grade rubbing crusher 4, tertiary rubbing crusher 7 is hammer mill, primary crusher 1, second grade rubbing crusher 4, the hammer leaf interval on the bistrique 102 of tertiary rubbing crusher 7 reduces in proper order, conveniently smash into littleer granule or piece with plastics, convenient recycle, second grade rubbing crusher 4, tertiary rubbing crusher 7 pan feeding end all articulates there is rotatable baffle against the current, make the wind of high velocity of flow only can drive plastics and smash from rubbing crusher pan feeding end outside entering rubbing crusher inside, avoid smashing the in-process plastics and can fly out rubbing crusher's pan feeding end against the current.

In this embodiment, the primary screening box 2 includes a first box 201, a plurality of first hoppers 207 are fixed below the first box 201 side by side, a first material recycling branch pipe 208 is fixed at the lower end of the first hopper 207, the first material recycling branch pipe 208 is communicated with the feeding end of the material recycling fan 14 through the material recycling main pipe 13, the discharging end of the material recycling fan 14 is communicated with the material recycling box 12, the crushed plastic particles fall into the first hopper 207 and then automatically fall into the first material recycling branch pipe 208, the suction force generated by the material recycling fan 14 is sucked into the material recycling main pipe 13 through the plastic particles in the first material recycling branch pipe 208 and then sent into the material recycling box 12 for storage, so as to be conveniently reused, two groups of four supporting wheels 205 are rotatably installed at the lower end inside the first box 201, two supporting wheels 205 in the same group are connected through a universal joint 209 in a transmission manner, a first rotating motor 206 in transmission connection with the supporting wheels 205 is fixed at one end of the first box 201, the two first rotating motors 206 are respectively used for driving the two groups of supporting wheels 205, the supporting wheels 205 are rotatably provided with a first screen mesh 203, the first screen mesh 203 is used for filtering plastics, the plastics meeting the size requirement can fall into a first hopper 207 through meshes of the first screen mesh 203, a pipe sleeve is fixed at the end part of the first screen mesh 203 corresponding to the position of the supporting wheel 205 and is contacted with the supporting wheel 205 to increase the wear resistance, one end of the first screen mesh 203 is lower and the other end is higher and inclined to facilitate the circulation of the plastics, a first feeding hopper 105 communicated with the primary crusher 1 is fixed at the end, close to the higher end of the first screen mesh 203, of the side wall of the first box body 201, a first discharging fan 202 communicated with the first air duct 3 is fixed at the end, close to the intersection of the first screen mesh 203, of the side wall of the first box body 201, the first discharging fan 202 is used for generating high-speed air flow to increase the air volume in the plastic crushing and recycling system, the rapid circulation of the materials is accelerated.

In this embodiment, the secondary screening box 5 includes a second box 501, a plurality of second funnels 507 are fixed below the second box 501 side by side, a second material recycling branch pipe 508 is fixed at the lower end of each second funnel 507, the second material recycling branch pipe 508 is communicated with the material recycling fan 14 through the material recycling main pipe 13, so that plastic particles meeting requirements can be recycled in time, a first fixed rotating shaft 504 is rotatably installed in the second box 501, a second screen 503 is fixed on the first fixed rotating shaft 504 through a plurality of support steel rings, the second screen 503 is used for filtering plastic, plastic meeting requirements can fall into the second funnels 507 through meshes of the second screen 503, a second rotating motor 506 in transmission connection with the first fixed rotating shaft 504 is fixed at one end of the second box 501, the first fixed rotating shaft 504 is driven by the second rotating motor 506 to rotate so as to drive the second screen 503 to rotate, the screening of the material is accelerated, one end of the second box body 501, which is provided with the second rotating motor 506, is fixed with a first flow guide pipe 505 communicated with the second-stage pulverizer 4, the other end of the second box body 501 is fixed with a second discharge fan 502 communicated with the second air duct 6, and the second discharge fan 502 is used for generating high-speed air flow, so that the air quantity in the plastic pulverizing and recycling system is increased, and the material is quickly circulated.

In this embodiment, the third screening box 8 includes a third box 801, a plurality of third funnels 807 are fixed below the third box 801 side by side, a third material recycling branch pipe 808 is fixed at the lower end of the third funnels 807, the third material recycling branch pipe 808 is communicated with the material recycling fan 14 through the material recycling main pipe 13, so as to facilitate timely recycling of plastic particles meeting requirements, a second fixed rotating shaft 805 is rotatably installed in the third box 801, a third screen 803 is fixed on the second fixed rotating shaft 805 through a plurality of supporting steel rings, the third screen 803 is used for filtering plastics, plastics meeting size requirements can fall into the third funnels through meshes of the third screen 803, a third rotating motor 806 in transmission connection with the second fixed rotating shaft 805 is fixed at one end of the third box 801, the third rotating motor 806 drives the second fixed rotating shaft 805 to rotate so as to drive the third screen 803 to rotate, the material screening is accelerated, a second flow guide pipe 804 communicated with a third air duct 9 is fixed at one end, provided with a third rotating motor 806, of the third box body 801, a third discharge fan 802 is fixed at the other end of the third box body 801, and the third discharge fan 802 is used for generating high-speed air flow and sucking out residual large plastics in the third screen 803.

In this embodiment, the third discharging fan 802 is communicated with any one of the primary crusher 1, the secondary crusher 4, and the tertiary crusher 7 through a pipeline, and the plastic which does not reach the crushing requirement can be sent into the crusher again to be crushed, so that the plastic can meet the requirement.

The working principle of the invention is as follows: when in use, the plastic to be recycled is poured into the first feeding hopper 105 by a conveying belt or a forklift, the plastic is crushed for the first time by the grinding head 102 of the crusher, then the crushed plastic particles are sent into the primary grade sieve box 2 by the induced draft fan 104, the first screen 203 rotates along with the rotation of the first rotating motor 206, the plastic particles meeting the crushing requirement in the rotating process fall into the first hopper 207 through the meshes of the first screen 203, then the plastic particles enter the material recycling main pipe 13 from the first material recycling branch pipe 208 under the suction force generated by the material recycling fan 14 and then are sent into the material recycling box 12 for storage, the plastic remained in the first screen 203 is sent into the secondary crusher 4 for secondary crushing by the suction force generated by the first discharging fan 202, the plastic particles after secondary crushing are sent into the secondary grade sieve box 5 along with the wind, the second screen 503 rotates along with the rotation of the second rotating motor 506, the plastic particles which meet the crushing requirement in the rotating process fall into a second hopper 507 through the meshes of a second screen 503, then enter a material recovery main pipe 13 from a second material recovery branch pipe 508 under the suction force generated by a material recovery fan 14 and then are sent into a material recovery box 12 for storage, the plastic particles remained in the second screen 503 are sent into a three-stage crusher 7 for third crushing by the suction force generated by a second discharge fan 502, the plastic particles which are crushed for the third time are sent into a three-stage sieve box 8 along with wind, a third screen 803 rotates along with the rotation of a third rotating motor 806, the plastic particles which meet the crushing requirement in the rotating process fall into a third hopper 807 through the meshes of the third screen 803, then enter the material recovery main pipe 13 from a third material recovery branch pipe 808 under the suction force generated by the material recovery fan 14 and then are sent into the material recovery box 12 for storage, the suction produced by the third discharge fan 802 sends the residual plastic in the third screen 803 which does not reach the requirement to the primary crusher 1, the secondary crusher 4 or the tertiary crusher 7 for re-crushing, so that the plastic reaches the requirement, in the crushing and screening process, the dust and the powdery plastic on the surface of the plastic are blown out from the dust outlet 15 by the high-speed air flow, then the plastic is sent into the dust removal box 10 through the dust collection pipe 11 for dust removal treatment of the air, and the dust-containing air is also sent into the dust removal box 10 for treatment before the tertiary screening, thereby reducing the dust content of the environment and avoiding pollution.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.