CN111974681A

CN111974681A - Plastic particle screening device with re-screening function and working method

Info

Publication number: CN111974681A
Application number: CN202010840911.0A
Authority: CN
Inventors: 李泽波
Original assignee: Ma'anshan Jinwag Machinery Technology Co Ltd
Current assignee: Ma'anshan Jinwag Machinery Technology Co Ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2020-11-24

Abstract

The invention discloses a plastic particle screening device with a re-screening function and a working method, and relates to the technical field of screening devices. The invention comprises two symmetrically arranged bases; the top surfaces of the two bases are fixedly connected with a group of damping parts; the top ends of the two groups of damping shock absorption pieces are fixedly connected with an outer shell; two symmetrically arranged vibration motors are fixedly connected to the peripheral side surface of the outer shell; the top surface of the outer shell is fixedly communicated with a feed hopper; the bottom surface of the outer shell is fixedly communicated with a discharge nozzle; the inner wall of the outer shell is rotatably connected with an inner screen drum through a bearing; a transmission motor is fixedly connected to one surface of the outer shell; one of the output shafts of the transmission motor is fixedly connected with the inner screen drum. According to the invention, through the design of the inner screen cylinder and the annular conveying screen, the device can realize high-efficiency screening of sand materials in an automatic mode, and the device is additionally provided with the re-screening mechanism on the basis of the traditional primary screening device, and through the increase of the re-screening mechanism, the wrong screening rate and the screen leakage rate of the device can be effectively reduced.

Description

Plastic particle screening device with re-screening function and working method

Technical Field

The invention belongs to the technical field of screening devices, and particularly relates to a plastic particle screening device with a re-screening function and a working method.

Background

At present, with the increasing consumption of energy-saving, environment-friendly, sustainable development and non-renewable resources, the industries such as the use of new energy, the research and development of new materials and the recycling of renewable resources are gradually developed and strengthened, wherein plastic products are the most common recyclable materials with large use amount in daily life, and in the process of recycling plastics, the granulation treatment of waste plastics is the most common treatment mode, so that not only can the occupied space during the compression storage and transportation be realized, but also the product manufacturing is more convenient during the subsequent utilization.

When handling the plastics raw materials after the pelletization, the granule of equidimension not just can make the quality of pelletization different, and the different production demand can be satisfied to the plastic granules of granule size, simultaneously to plastics recovery processing's firm, the economic benefits that the plastic granules of different qualities can bring is also the diverse, consequently often still need filter and distinguish plastic granules after the plastics pelletization, current sieving mechanism, it is many through vibrating screen, so that plastic granules sees through the screen cloth, current sieving mechanism often can only once filter the material, and the sieve mesh blocks up easily during the screening, and then cause its use cost higher.

Disclosure of Invention

The invention aims to provide a plastic particle screening device with a re-screening function and a working method thereof, and solves the problems that the existing screening device is poor in screening effect and does not have the re-screening function through the design of a vibration motor, a primary discharging hopper, a secondary discharging hopper, a high-pressure blockage cleaning spray pipe and an annular conveying screen.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a plastic particle screening device with a re-screening function, which comprises two symmetrically arranged bases; the top surfaces of the two bases are fixedly connected with a group of damping parts; the top ends of the two groups of damping shock absorption pieces are fixedly connected with an outer shell; two symmetrically arranged vibration motors are fixedly connected to the peripheral side surface of the outer shell; the top surface of the outer shell is fixedly communicated with a feed hopper; a discharge nozzle is fixedly communicated with the bottom surface of the outer shell;

the inner wall of the outer shell is rotatably connected with an inner screen drum through a bearing; a transmission motor is fixedly connected to one surface of the outer shell; one of the output shafts of the transmission motors is fixedly connected with the inner screen drum; a primary discharge hopper is fixedly arranged at the axis position of the inner screen drum; the surface of the outer shell is fixedly connected with the primary discharging hopper through a connecting frame; a plurality of groups of mutually isolated screening material sub-cavities which are distributed in a circumferential array are formed in the circumferential side surface of the inner screen cylinder; the inner walls of the screening material sub-cavities are rotatably connected with rotating shafts through bearings; the circumferential side surface of the rotating shaft is fixedly connected with a forward spiral material shifting blade and a reverse spiral material shifting blade respectively; a plurality of groups of primary sieve holes communicated with the inner sieve barrel are fixedly formed in the inner walls of the material screening chambers; the inner wall of the outer shell is fixedly connected with a fixed gear ring; the peripheral side surfaces of the rotating shafts are fixedly connected with driven gears; the peripheral side surfaces of a group of driven gears are all meshed with the fixed gear ring;

the bottom surface of the discharge nozzle is fixedly communicated with a secondary discharge hopper; the inner wall of the secondary discharge hopper is fixedly connected with an annular driving assembly; the circumferential side surface of the annular driving component is connected with an annular conveying screen; a plurality of groups of secondary sieve pores are equidistantly formed in the surface of the annular conveying screen; the inner wall of the secondary discharge hopper is fixedly connected with a high-pressure blockage removing spray pipe; a high-pressure air pump is fixedly connected to one surface of the secondary discharge hopper; one end of the air outlet of the high-pressure air pump is fixedly communicated with the high-pressure blockage removing spray pipe.

Preferably, the annular driving assembly comprises a driving roller, a driven roller and a servo motor; two ends of the driving roller and two ends of the driven roller are both rotationally connected with the secondary discharge hopper; one end of the output shaft of the servo motor is fixedly connected with the driving roller; one surface of the servo motor is fixedly connected with the secondary discharge hopper.

Preferably, the bottom of the primary discharging hopper and the bottom of the secondary discharging hopper are fixedly provided with discharging inclined planes; the discharge direction of the secondary discharging hopper is the same as that of the primary discharging hopper.

Preferably, the forward spiral material shifting blade and the reverse spiral material shifting blade are symmetrically arranged on the peripheral side surface of the rotating shaft; the forward spiral material shifting blade and the reverse spiral material shifting blade have the same structural characteristics with opposite spiral directions.

Preferably, the screening material sub-cavity is of an inverted isosceles triangle structure with rounded corners at the bottom end; the circumferential side surfaces of the forward spiral material shifting blade and the reverse spiral material shifting blade are attached to the material screening sub-cavity.

Preferably, the discharge nozzle is positioned right below the feed hopper; the shape of the outer shell is matched with that of the inner screen drum; the inner screen cylinder is of a hollow cylindrical structure with openings at two ends.

Preferably, the damping shock absorbing member comprises a damping telescopic tube; the damping spring is sleeved on the peripheral side surface of the damping telescopic pipe; the damping telescopic pipe fixing section is fixedly connected with the base; the movable section of the damping telescopic pipe is fixedly connected with the outer shell.

Preferably, friction grains are fixedly arranged on the bottom surfaces of the two bases; the cross section of the feed hopper is of a trapezoidal structure; the feeder hopper both ends all are provided with the opening.

Preferably, the aperture size of the primary sieve pore is the same as that of the secondary sieve pore; the bottom of the high-pressure blockage removing spray pipe is fixedly communicated with a spray head with an air outlet direction opposite to the annular conveying screen; the high-pressure blockage cleaning spray pipe is positioned on the inner side of the annular conveying screen.

Preferably, the working method of the plastic particle screening device with the re-screening function comprises the following steps:

SS 001: the method comprises the steps that before presetting and working, the vibration frequencies of two vibration motors are set through a controller, the rotating speeds of a transmission motor and an annular driving assembly are set through the controller, the primary screening time of materials can be effectively controlled through controlling the rotating speed of the transmission motor, the secondary screening time of the materials can be effectively controlled through controlling the rotating speed of the annular driving assembly, and then the screening efficiency of the device is controlled;

SS 002: during the screening and re-screening operation and operation, the two vibrating motors work at a set vibration frequency, the transmission motor drives the inner screen cylinder to move circularly at a set speed, the annular driving assembly drives the annular conveying screen to move annularly at a set speed, materials to be screened enter the outer shell in batches and in fractional components from the feeding hopper, the materials fall into corresponding screening material sub-cavities after entering, the materials which meet the particle size are screened by a screen mesh and then discharged by a primary discharging hopper, the materials which do not meet the particle size are intercepted in the screening material sub-cavities, the materials intercepted in the screening material sub-cavities can be fully disturbed under the action of the forward spiral material shifting blade and the reverse spiral material shifting blade, the materials are fully screened, the materials which do not meet the particle size are discharged onto the annular conveying screen through the discharging nozzle along with the rotation of the inner screen cylinder, and the materials fall into the annular conveying screen, the waste materials are secondarily screened, the secondarily screened fine materials are discharged through a secondary discharge hopper, and the final waste materials are discharged through the end part of the annular conveying screen along with the rotation of the annular conveying screen;

and (4) SS 003: from maintenance, in the working process, high compression pump can work in good time periodically, blows off the impurity that blocks up on the annular conveying screen cloth to guarantee the high filtration performance of annular conveying screen cloth, and reduce the device's the maintenance degree of difficulty.

The invention has the following beneficial effects:

1. according to the invention, through the design of the inner screen cylinder and the annular conveying screen, the device can realize high-efficiency screening of sand materials in an automatic mode, and the device is additionally provided with the re-screening mechanism on the basis of the traditional primary screening device, and through the increase of the re-screening mechanism, the wrong screening rate and the screen leakage rate of the device can be effectively reduced.

2. According to the invention, through the design of the screening material separating cavity, the traditional flood type screening is changed into component type screening, through the component type screening, the screening holes can be uniformly used, and then the blocking rate of the screening holes is reduced, and through the movable design of the annular conveying screen, on one hand, the rapid screening of materials can be realized, and on the other hand, the screen can be cleaned in all directions, so that the blocking probability of the screen is reduced.

3. According to the invention, through the drum-type external screening design and the matching design of the vibration motor, impurities blocked in the filtering holes of the drum can be automatically discharged under the action of gravity and the vibration motor, and then the self-maintenance of the sieve holes is completed, so that the maintenance difficulty and the use cost of the device are effectively reduced.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

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

FIG. 1 is a schematic structural diagram of a plastic particle screening device with a re-screening function;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of FIG. 1 in another direction;

FIG. 4 is a schematic structural diagram of an inner screen drum, a primary screen hole, a rotating shaft and a driven gear;

FIG. 5 is a schematic structural view of the secondary hopper, the annular drive assembly, the annular delivery screen and the secondary screen apertures;

in the drawings, the components represented by the respective reference numerals are listed below:

1. a base; 2. a damping shock absorbing member; 3. an outer housing; 4. a vibration motor; 5. a feed hopper; 6. a discharge nozzle; 7. an inner screen cylinder; 8. a drive motor; 9. a first-stage discharge hopper; 10. screening and dividing the cavity; 11. a rotating shaft; 12. a forward spiral material shifting blade; 13. a reverse spiral material stirring blade; 14. primary sieve pores; 15. a fixed gear ring; 16. a driven gear; 17. a second-stage discharge hopper; 18. an annular drive assembly; 19. an annular conveying screen; 20. secondary sieve pores; 21. a high-pressure blockage cleaning spray pipe; 22. a high pressure air pump; 23. a drive roll; 24. a servo motor; 25. damping telescopic pipes; 26. a damping spring; 27. and a connecting frame.

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.

Referring to fig. 1-5, the present invention is a plastic particle screening apparatus with re-screening function, which comprises two symmetrically arranged bases 1; the top surfaces of the two bases 1 are fixedly connected with a group of damping shock absorption pieces 2; the top ends of the two groups of damping shock absorption pieces 2 are fixedly connected with an outer shell 3; two symmetrically arranged vibration motors 4 are fixedly connected to the peripheral side surface of the outer shell 3; when the two vibrating motors 4 work, the vibrating motors work at a set vibration frequency, and the vibrating motors vibrate to carry out screening operation according to a vibrating screening principle, so that the screening speed and the screening effect of the device are improved; simultaneously, through the vibration design of the vibration motor 4, the probability that the material is blocked in the sieve holes of the inner sieve cylinder 7 can be effectively reduced, the damping part 2 has the effect of providing certain damping capacity for the device on one hand, and the vibration sieve material effect of the vibration motor 4 is enhanced on the other hand.

The top surface of the outer shell 3 is fixedly communicated with a feed hopper 5; a discharge nozzle 6 is fixedly communicated with the bottom surface of the outer shell 3;

the inner wall of the outer shell 3 is rotatably connected with an inner screen drum 7 through a bearing; a transmission motor 8 is fixedly connected to one surface of the outer shell 3; one output shaft of the transmission motor 8 is fixedly connected with the inner screen drum 7; a primary discharge hopper 9 is fixedly arranged at the axis position of the inner screen drum 7; the surface of the outer shell 3 is fixedly connected with the primary discharging hopper 9 through a connecting frame 27; a plurality of groups of mutually isolated screening material sub-chambers 10 distributed in a circumferential array are arranged on the circumferential side surface of the inner screen drum 7; through the design of the plurality of screening material sub-cavities 10, batch, fractional and component screening during screening is realized, and through the batch, fractional and component screening, the screening rate of the device is effectively improved, and the blocking probability of the device is reduced;

the inner walls of the screening material sub-cavities 10 are all rotatably connected with a rotating shaft 11 through bearings; the peripheral side surface of the rotating shaft 11 is fixedly connected with a forward spiral material stirring blade 12 and a reverse spiral material stirring blade 13 respectively, and the forward spiral material stirring blade 12 and the reverse spiral material stirring blade 13 are used for stirring materials from two directions so as to enhance the blanking and screening speed of the materials through stirring;

a plurality of groups of primary sieve holes 14 communicated with the inner sieve drum 7 are fixedly formed in the inner walls of the group of material screening chambers 10; the inner wall of the outer shell 3 is fixedly connected with a fixed gear ring 15; the peripheral side surfaces of one group of the rotating shafts 11 are fixedly connected with driven gears 16, the peripheral side surfaces of one group of the driven gears 16 are meshed with fixed gear rings 15, and when the inner screen drum 7 generates circular motion under the action of the transmission motor 8, due to the meshed connection design of the fixed gear rings 15 and the driven gears 16, the driven gears 16 can drive the rotating shafts 11 to generate circular motion; along with the circular motion of the inner screen drum 7, the materials blocked in the primary screen holes 14 can be automatically discharged, so that the self-maintenance of the primary screen holes 14 is realized, and the probability of the blockage of the primary screen holes 14 is reduced;

the bottom surface of the discharge nozzle 6 is fixedly communicated with a secondary discharge hopper 17; the inner wall of the secondary discharge hopper 17 is fixedly connected with an annular driving component 18; the circumferential side surface of the annular driving component 18 is connected with an annular conveying screen 19; a plurality of groups of secondary sieve holes 20 are equidistantly formed in the surface of the annular conveying screen 19, the annular conveying screen 19 is matched with the secondary sieve holes 20 to realize secondary screening of the materials subjected to primary screening, and the primary sieve holes 14 and the secondary sieve holes 20 have the same aperture size, so that the secondary screening effect is realized;

the inner wall of the secondary discharge hopper 17 is fixedly connected with a high-pressure blockage removing spray pipe 21; a high-pressure air pump 22 is fixedly connected to one surface of the secondary discharge hopper 17; one end of the air outlet of the high-pressure air pump 22 is fixedly communicated with the high-pressure blockage removing spray pipe 21.

As further shown in fig. 3 and 5, the endless drive assembly 18 includes a drive roller 23, a driven roller, and a servo motor 24; the two ends of the driving roller 23 and the driven roller are rotatably connected with the secondary discharge hopper 17; one end of an output shaft of the servo motor 24 is fixedly connected with the driving roller 23; one surface of the servo motor 24 is fixedly connected with the secondary discharge hopper 17.

As further shown in fig. 3, the bottom of the first-stage discharge hopper 9 and the bottom of the second-stage discharge hopper 17 are fixedly provided with discharge slopes; the discharge direction of the secondary discharge hopper 17 is the same as that of the primary discharge hopper 9.

Further, the forward spiral material shifting blade 12 and the reverse spiral material shifting blade 13 are symmetrically arranged on the peripheral side surface of the rotating shaft 11; the forward spiral material shifting blade 12 and the reverse spiral material shifting blade 13 have the same structural characteristics in the opposite spiral directions; the material screening sub-cavity 10 is of an inverted triangle structure with a rounded corner at the bottom end; the circumferential side surfaces of the forward spiral material shifting blade 12 and the reverse spiral material shifting blade 13 are attached to the material screening sub-cavity 10.

Further, the discharge nozzle 6 is positioned right below the feed hopper 5; the shape of the outer shell 3 is matched with that of the inner screen drum 7; the inner screen drum 7 is a hollow cylindrical structure with two open ends.

Further, the damping shock absorbing member 2 comprises a damping telescopic tube 25; the damping spring 26 is sleeved on the peripheral side surface of the damping telescopic pipe 25; the fixed section of the damping telescopic pipe 25 is fixedly connected with the base 1; the movable section of the damping telescopic pipe 25 is fixedly connected with the outer shell 3.

Furthermore, friction grains are fixedly arranged on the bottom surfaces of the two bases 1; the cross section of the feed hopper 5 is of a trapezoidal structure; the 5 both ends of feeder hopper all are provided with the opening.

Further, the aperture size of the primary sieve pore 14 is the same as that of the secondary sieve pore 20; the bottom of the high-pressure blockage removing spray pipe 21 is fixedly communicated with a spray head with an air outlet direction opposite to the annular conveying screen 19; the high pressure cleaning lance 21 is located inside the annular delivery screen 19.

Further, the working method of the plastic particle screening device with the re-screening function comprises the following steps:

SS 001: the vibration frequency of the two vibration motors 4 is set through the controller before presetting and working, the rotating speed of the transmission motor 8 and the rotating speed of the annular driving assembly 9 are set through the controller, the primary screening time of materials can be effectively controlled through controlling the rotating speed of the transmission motor 8, the secondary screening time of the materials can be effectively controlled through controlling the rotating speed of the annular driving assembly 9, and then the screening efficiency of the device is controlled;

SS 002: during the screening and re-screening operation and the operation, the two vibrating motors 4 work at a set vibration frequency, the transmission motor 8 drives the inner screen cylinder 10 to move circularly at a set speed, the annular driving component 9 drives the annular conveying screen 19 to move annularly at a set speed, the materials to be screened enter the outer shell 3 from the feeding hopper 5 in batches and in a fractional component manner, the materials enter and then fall into the corresponding screening material sub-cavities 10, the materials which accord with the particle size are screened by the primary screen hole 14 after falling into, and then are discharged by the primary discharging hopper 9, the materials which do not accord with the particle size are intercepted in the screening material sub-cavities 10, the materials intercepted in the screening material sub-cavities 10 can be fully disturbed under the action of the forward spiral material stirring blades 12 and the reverse spiral material stirring blades 13, so that the materials are fully screened, and the materials which do not accord with the particle size are discharged onto the annular conveying screen 19 through the discharging nozzle 6 along with the rotation of the inner screen cylinder 10, after the materials fall, the waste materials are secondarily screened, the secondarily screened fine materials are discharged through the secondary discharge hopper 17, and the final waste materials are discharged through the end part of the annular conveying screen 19 along with the rotation of the annular conveying screen 19;

and (4) SS 003: in the self-maintenance and working process, the high-pressure air pump 22 can work periodically and timely to blow off impurities blocked on the annular conveying screen 19, so that the high filtering performance of the annular conveying screen 19 is ensured, and the maintenance difficulty of the device is reduced.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A plastic particle screening device with a re-screening function comprises two symmetrically arranged bases (1); the top surfaces of the two bases (1) are fixedly connected with a group of damping parts (2); the top ends of the two groups of damping shock absorption pieces (2) are fixedly connected with an outer shell (3); two symmetrically arranged vibration motors (4) are fixedly connected to the peripheral side surface of the outer shell (3); the top surface of the outer shell (3) is fixedly communicated with a feed hopper (5); the fixed intercommunication in shell body (3) bottom surface has row material mouth (6), its characterized in that:

the inner wall of the outer shell (3) is rotatably connected with an inner screen drum (7) through a bearing; a transmission motor (8) is fixedly connected to one surface of the outer shell (3); one output shaft of the transmission motor (8) is fixedly connected with the inner screen drum (7); a primary discharge hopper (9) is fixedly arranged at the axis position of the inner screen drum (7); the surface of the outer shell (3) is fixedly connected with the primary discharge hopper (9) through a connecting frame (27); a plurality of groups of mutually isolated screening material sub-chambers (10) which are distributed in a circumferential array are arranged on the circumferential side surface of the inner screen drum (7); the inner walls of the screening material sub-cavities (10) are all rotatably connected with a rotating shaft (11) through bearings; the peripheral side surface of the rotating shaft (11) is fixedly connected with a forward spiral material shifting blade (12) and a reverse spiral material shifting blade (13) respectively; a plurality of groups of primary sieve holes (14) communicated with the inner sieve drum (7) are fixedly formed in the inner walls of the group of material screening chambers (10); the inner wall of the outer shell (3) is fixedly connected with a fixed gear ring (15); the peripheral side surfaces of the rotating shafts (11) are fixedly connected with driven gears (16); the peripheral side surfaces of a group of driven gears (16) are all meshed with a fixed gear ring (15);

the bottom surface of the discharge nozzle (6) is fixedly communicated with a secondary discharge hopper (17); the inner wall of the secondary discharge hopper (17) is fixedly connected with an annular driving component (18); the circumferential side surface of the annular driving component (18) is connected with an annular conveying screen (19); a plurality of groups of secondary sieve holes (20) are formed in the surface of the annular conveying screen (19) at equal intervals; the inner wall of the secondary discharge hopper (17) is fixedly connected with a high-pressure blockage removing spray pipe (21); one surface of the secondary discharge hopper (17) is fixedly connected with a high-pressure air pump (22); one end of the air outlet of the high-pressure air pump (22) is fixedly communicated with the high-pressure blockage removing spray pipe (21).

2. A plastic particle screening apparatus with re-screening function as claimed in claim 1, wherein said endless drive assembly (18) includes a drive roller (23), a driven roller and a servo motor (24); the two ends of the driving roller (23) and the driven roller are rotationally connected with the secondary discharge hopper (17); one end of an output shaft of the servo motor (24) is fixedly connected with the driving roller (23); one surface of the servo motor (24) is fixedly connected with the secondary discharge hopper (17).

3. The plastic particle screening device with the secondary screening function of claim 1, wherein the bottom of the primary discharging hopper (9) and the bottom of the secondary discharging hopper (17) are fixedly provided with discharging inclined planes; the discharge direction of the secondary discharge hopper (17) is the same as that of the primary discharge hopper (9).

4. The plastic particle screening device with the re-screening function as claimed in claim 1, wherein the forward spiral material-stirring blade (12) and the reverse spiral material-stirring blade (13) are symmetrically arranged on the peripheral side of the rotating shaft (11); the forward spiral material shifting blade (12) and the reverse spiral material shifting blade (13) have the same structure characteristics with opposite spiral directions.

5. The plastic particle screening device with the secondary screening function of claim 1, wherein the screening material sub-chamber (10) is of an inverted isosceles triangle structure with rounded corners at the bottom end; the circumferential side surfaces of the forward spiral material shifting blade (12) and the reverse spiral material shifting blade (13) are attached to the material sieving sub-cavity (10).

6. The plastic particle screening device with the secondary screening function of claim 1, wherein the discharge nozzle (6) is positioned right below the feed hopper (5); the shape of the outer shell (3) is matched with that of the inner screen drum (7); the inner screen drum (7) is of a hollow cylindrical structure with two open ends.

7. The plastic particle screening device with the re-screening function as claimed in claim 1, wherein the damping shock absorption member (2) comprises a damping telescopic pipe (25); the damping spring (26) is sleeved on the peripheral side surface of the damping telescopic pipe (25); the fixed section of the damping telescopic pipe (25) is fixedly connected with the base (1); the movable section of the damping telescopic pipe (25) is fixedly connected with the outer shell (3).

8. The plastic particle screening device with the re-screening function as claimed in claim 1, wherein friction lines are fixedly arranged on the bottom surfaces of the two bases (1); the cross section of the feed hopper (5) is of a trapezoidal structure; both ends of the feed hopper (5) are provided with openings.

9. The plastic particle screening device with the secondary screening function as claimed in claim 1, wherein the primary screen holes (14) and the secondary screen holes (20) have the same pore size; the bottom of the high-pressure blockage removing spray pipe (21) is fixedly communicated with a spray head with an air outlet direction opposite to the annular conveying screen (19); the high-pressure blockage cleaning spray pipe (21) is positioned on the inner side of the annular conveying screen (19).

10. The working method of the plastic particle screening device with the re-screening function as claimed in any one of claims 1 to 9, is characterized by comprising the following steps:

SS 001: the vibration frequency of the two vibration motors (4) is set through the controller before presetting and working, the rotating speeds of the transmission motor (8) and the annular driving assembly (9) are set through the controller, the primary screening time of materials can be effectively controlled through controlling the rotating speed of the transmission motor (8), the secondary screened time of the materials can be effectively controlled through controlling the rotating speed of the annular driving assembly (9), and then the screening efficiency of the device is controlled;

SS 002: during the screening and re-screening operation and the work, the two vibrating motors (4) work at a set vibration frequency, the transmission motor (8) drives the inner screen cylinder (10) to move circularly at a set speed, the annular driving component (9) drives the annular conveying screen (19) to move annularly at a set speed, materials to be screened enter the outer shell (3) from the feeding hopper (5) in batches and in a fractional component manner, the materials enter the corresponding screening material sub-cavities (10) and fall into the corresponding screening material sub-cavities, after falling, the materials which accord with the particle sizes are screened by the primary screen holes (14) and then are discharged by the primary discharging hopper (9), the materials which do not accord with the particle sizes are intercepted in the screening material sub-cavities (10), and the materials intercepted in the screening material sub-cavities (10) can be fully disturbed under the action of the forward spiral material shifting blades (12) and the reverse spiral material shifting blades (13), so that the materials are fully screened, materials which do not conform to the particle size are discharged onto the annular conveying screen (19) through the discharge nozzle (6) along with the rotation of the inner screen cylinder (10), after the materials fall, the waste materials are screened secondarily, the secondarily screened fine materials are discharged through the secondary discharge hopper (17), and the final waste materials are discharged through the end part of the annular conveying screen (19) along with the rotation of the annular conveying screen (19);

and (4) SS 003: in the self-maintenance and working processes, the high-pressure air pump (22) can work periodically and timely to blow off impurities blocked on the annular conveying screen (19), so that the high filtering performance of the annular conveying screen (19) is ensured, and the maintenance difficulty of the device is reduced.