CN114178175A

CN114178175A - Plastic particle screening device and method for plastic granulation

Info

Publication number: CN114178175A
Application number: CN202111490108.XA
Authority: CN
Inventors: 肖广兴; 熊世杰; 邓志勇
Original assignee: Hunan Dengke Material Technology Co ltd
Current assignee: Hunan Dengke Material Technology Co ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-03-15
Anticipated expiration: 2041-12-08
Also published as: CN114178175B

Abstract

The invention is suitable for the related technical field of plastic processing, and provides a plastic particle screening device and a screening method for plastic granulation, wherein the plastic particle screening device comprises a mounting seat, a fixed shaft vertical to the mounting seat is fixedly arranged on the mounting seat, and a supporting rod is fixedly arranged at the upper part of the fixed shaft; the screening plate is rotatably arranged in the bearing box and connected with the side plate, and when the screening plate is turned over, the side plate is driven to be opened through the connecting rod; the resetting assembly is connected with the bearing box and the screening plate; the oscillating assembly is arranged on the mounting seat and connected with the bearing box, and the oscillating assembly is matched with an elastic assembly arranged at the upper part of the dead axle to drive the bearing box to vibrate at high frequency; the picking assembly is connected with the bearing box, and the bearing box is lifted to the abutting rod and abutted against the screening plate periodically by the picking assembly, so that plastic particles are screened.

Description

Plastic particle screening device and method for plastic granulation

Technical Field

The invention belongs to the technical field related to plastic processing, and particularly relates to a plastic particle screening device and method for plastic granulation.

Background

The plastic particles refer to granular plastics, and are generally divided into more than 200 types and are subdivided into thousands of types.

Common plastic particles include general plastics, engineering plastics and special plastics.

General purpose plastics: polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyester, polyurethane, and the like.

Engineering plastics: nylon, polytetrafluoro, polyformaldehyde, polycarbon organosilicon, etc.

Special plastics: thermosetting plastics, functional polymer plastics, such as artificial kidney.

In the production process of plastic particles, the size of the plastic particles is required to be strictly controlled generally for specific requirements, but in the use process of the existing plastic particle screening device, the plastic particles which do not meet the requirements need to be regularly disposed, the filtration efficiency is influenced by the plastic particles, and the work needs to be stopped during the treatment, so that the work efficiency is reduced.

Disclosure of Invention

The invention provides a plastic particle screening device and a plastic particle screening method for plastic granulation, and aims to solve the problem that plastic particles which do not meet standards flow into the market.

The invention is realized in such a way that the plastic particle screening device and the screening method for plastic granulation comprise the following steps:

the mounting seat is horizontally arranged, a fixed shaft perpendicular to the mounting seat is fixedly mounted on the mounting seat, and a supporting rod is fixedly mounted at the upper part of the fixed shaft;

the receiving box is movably arranged on the mounting seat, a reversible screening plate is rotatably arranged in the receiving box, a plurality of through holes with the same diameter are equidistantly arranged on the screening plate to filter plastic particles with the size meeting the requirements, the screening plate is connected with a side plate movably arranged on the side wall of the receiving box through a connecting rod, and when the screening plate is overturned, the side plate is driven to be opened through the connecting rod;

the reset assembly is connected with the receiving box and the screening plate and is used for keeping the screening plate in a horizontal state and keeping the side plates in a closed state under the condition of no external force;

the oscillating assembly is arranged on the mounting seat and connected with the bearing box, and the oscillating assembly is matched with an elastic assembly arranged at the upper part of the dead axle to drive the bearing box to vibrate at high frequency;

the picking assembly is connected with the bearing box, the vibrating assembly is matched with the elastic assembly to drive the bearing box to periodically lift the bearing box to the abutting rod and the screening plate to abut against when the bearing box vibrates at high frequency, so that the screening plate overturns, and the picking assembly is arranged on the mounting seat.

Furthermore, the oscillating assembly is connected with the lifting assembly through a speed reducing assembly, and the speed reducing assembly comprises a mounting plate vertically and fixedly mounted on the mounting seat, a first gear which is rotatably mounted on the mounting plate and is connected with the oscillating assembly, and a second gear which is meshed with the first gear and is rotatably mounted on the mounting plate;

wherein, the second gear is connected with the lifting component.

Furthermore, the reset assembly comprises a bulge fixedly arranged on the side wall of one side of the receiving box, a baffle fixedly arranged in the receiving box, a spring sleeve rotatably connected with the baffle, a second spring arranged in the spring sleeve, and a movable rod, one end of the movable rod is inserted into the spring sleeve and is connected with the second spring, and the other end of the movable rod is rotatably connected with the screening plate.

Furthermore, the oscillation assembly comprises a power device fixedly mounted on the mounting plate, a cam connected with an output shaft of the power device and rotatably mounted on the mounting plate, and a connecting structure connected with the cam in a rolling manner and arranged on the fixed shaft in a sliding manner through a limiting structure, the connecting structure is connected with the bearing box and the lifting assembly, and the output shaft of the power device is fixedly connected with the first gear.

Furthermore, the limiting structure comprises limiting blocks symmetrically and fixedly arranged on the fixed shaft and grooves which are arranged on the connecting assembly and matched with the limiting blocks, wherein the limiting blocks are in a long strip shape.

Furthermore, the connecting structure comprises a sliding sleeve arranged on the fixed shaft in a sliding mode and a fixing piece fixedly connected with the sliding sleeve;

the inner wall of the sliding sleeve is provided with the groove, one side of the fixing piece is fixedly connected with the bearing box, the other side of the fixing piece is rotatably provided with a pulley in rolling connection with the cam, the fixing piece is further provided with a guide rail, and the guide rail is matched with the lifting assembly.

Furthermore, the elastic assembly comprises a limiting plate fixedly mounted at the upper end of the fixed shaft, a first spring sleeved on the fixed shaft, one end of the first spring is abutted to the limiting plate, the other end of the first spring is abutted to the sliding sleeve, and the upper part of the limiting plate is fixedly mounted with the abutting rod.

Furthermore, the lifting assembly comprises a rotary disc fixedly connected with the second gear, and a support rod with one end hinged on the rotary disc, the other end of the support rod is provided with a sliding block, and the sliding block is slidably arranged in the guide rail.

The plastic particle screening device for plastic granulation and the use method of the screening method comprise the following steps:

the method comprises the following steps: pouring a proper amount of plastic particles into the receiving box, and starting the power device;

step two: the power device drives the cam to rotate and acts on the pulley on the fixed piece, and when the joint of the cam and the pulley is changed from the short axis of the cam to the long axis, the pulley drives the fixed piece and the sliding sleeve to move upwards so as to enable the bearing box to move upwards;

step three: when the connection part of the cam and the pulley is changed from the long shaft of the cam to the short shaft of the cam, the fixing piece and the sliding sleeve are forced to keep a rolling connection relation with the cam under the action of the first spring to drive the receiving box to move downwards, and the third step and the fourth step are repeated in the process that the cam continuously rotates, so that the receiving box generates vibration, and the screening speed of the screening plate is increased;

step four: in the process that the cam rotates for a plurality of circles, plastic particles are screened, meanwhile, the first gear drives the second gear to rotate so as to drive the turntable to rotate, the fixing piece and the sliding sleeve are driven to move upwards through the supporting rod, so that the bearing box moves upwards until the abutting rod abuts against the screening plate, and the screening plate overturns;

step five; the screening plate takes place to overturn, drives the curb plate through the connecting rod and opens, and the plastic granules who is not conform to the requirement on the screening plate is the parabola motion under the action of gravity, falls out from the curb plate and holds the case.

Compared with the prior art, the invention has the beneficial effects that:

because current plastic granules apparatus for producing does not mostly have the screening function, lead to the unqualified plastic granules of size to flow in market, influence product quality, so set up and vibrate subassembly and elastic component, the two is mutually supported, make and accept the case and take place to vibrate, accelerate the screening speed of screening board, simultaneously after the screening is accomplished, the subassembly of picking will accept the case lifting to the commentaries on classics state of resisting pole and screening board butt, and continue to move, make the screening board upset, the curb plate is opened when the screening board upset passes through the connecting rod, the defective products on the screening board is by the curb plate drop out and accept the case this moment.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

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 for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a side view of a perspective structural view provided by the present invention.

Fig. 3 is a schematic plan view provided by the present invention.

Fig. 4 is a cross-sectional view provided by the present invention.

Fig. 5 is an enlarged schematic view of the structure at a in fig. 4.

Reference numerals:

the device comprises a mounting base 1, a fixed shaft 2, a fixed shaft 3, a limiting block 4, a sliding sleeve 5, a first spring 6, a fixed part 7, a receiving box 8, a mounting plate 9, a power device 10, a first gear 11, a cam 12, a pulley 13, a second gear 14, a rotary table 15, a supporting rod 15, a screening plate 16, a resisting rod 17, a side plate 18, a connecting rod 19, a movable rod 20, a second spring 21, a spring sleeve 22 and a baffle 23.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to effectively explain embodiments of the present invention, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The invention provides a plastic particle screening device and a plastic particle screening method for plastic granulation, which aim to solve the problem that plastic particles which do not meet the standard flow into the market.

Example one

Referring to fig. 1 to 5, a plastic granule screening apparatus and a screening method for plastic granulation provided by the embodiment of the present invention includes:

the mounting base 1, the mounting base 1 is the level setting just fixed mounting has dead axle 2 perpendicular to it on the mounting base 1, the upper portion fixed mounting of dead axle 2 has to support the pole 17.

The mounting base 1 is of a cuboid structure, and can be fixedly connected with the horizontal ground through bolts in actual use for improving the stability of the whole device, so that the device is guaranteed not to shake in the working process.

The mounting seat 1 and the fixed shaft 2 can be of an integral structure or can be of a detachable structure, and maintenance or repair is convenient.

The bearing box 7, the activity of bearing box 7 sets up on the mount pad 1, the bearing box 7 internal rotation is provided with the screening board 16 that can overturn, the equidistance is provided with the same through-hole of a plurality of diameters in order to filter the plastic granules that the size meets the requirements on the screening board 16, the screening board 16 passes through connecting rod 19 and connects the activity setting and be in curb plate 18 on the bearing box 7 lateral wall when the upset takes place for the screening board 16, through connecting rod 19 drives curb plate 18 and opens.

The upper portion that holds case 7 is cuboid structure and inside cavity, and the both ends of screening plate 16 are smooth curved surface setting, and when screening plate 16 was in the horizontality, its just closely laminated with the lateral wall that holds case 7 to guarantee at the in-process that holds case 7 and vibrate, plastic granules can not fall down from screening plate 16 and the clearance of holding between the board 7, lead to unqualified product to participate in the certified products.

In the process of oscillation of the receiving box 7, the receiving plate 7 is always kept in a horizontal state, the side plates 18 and the receiving box 7 are kept in a closed state through the connecting rods 19, at the moment, the screening plate 16 screens plastic particles, qualified products pass through the screening plate 16 and fall out of the lower portion of the receiving box 7, and unqualified products fall out of the receiving box 7 from the side plates 18 when the screening plate 16 is turned over.

And the resetting component is connected with the receiving box 7 and the screening plate 16 and is used for keeping the screening plate 16 in a horizontal state and keeping the side plates 18 in a closed state under the condition of no external force.

During the oscillation of the receiving box 7, the screening plate 16 is kept horizontal by the reset assembly, at this time, the side plates 18 are also in a closed state under the action of the connecting rods 19, and plastic particles are screened through the screening plate 16.

The oscillating assembly is arranged on the mounting base 1 and connected with the bearing box 7, and the oscillating assembly is matched with an elastic assembly arranged at the upper part of the fixed shaft 2 to drive the bearing box 7 to vibrate at high frequency;

the lifting assembly is connected with the receiving box 7, when the oscillating assembly is matched with the elastic assembly to drive the receiving box 7 to vibrate at high frequency, the lifting assembly periodically lifts the receiving box 7 until the abutting rod 17 abuts against the screening plate 16 so as to turn over the screening plate 16, and the lifting assembly is arranged on the mounting seat 1;

the oscillating assembly is connected with the lifting assembly through a speed reducing assembly, and the speed reducing assembly comprises an installation plate 8 vertically and fixedly installed on the installation seat 1, a first gear 10 rotatably installed on the installation plate 8 and connected with the oscillating assembly, and a second gear 13 meshed with the first gear 10 and rotatably installed on the installation plate 8;

wherein, the second gear 13 is connected with the lifting assembly.

Vibrate subassembly and elastic component cooperation, vibrate in order to drive and hold the case 7 and vibrate, add the screening speed of screening plate 16, at the in-process of plastic granules screening, No. one gear 10 and No. two meshing of gear 13 and drive No. two gears 13 and rotate, after the plastic granules screening is accomplished, No. two gears 13 drive is picked up the subassembly and will be held case 7 and lift up to support lever 17 and screening plate 16 butt, make screening plate 16 take place the upset, screening plate 16 makes curb plate 18 open through connecting rod 19, the defective work on the screening plate 16 at this moment falls out from curb plate 18 and holds case 7.

It should be noted that the transmission ratio between the first gear 10 and the second gear 13 is less than 1.

Example two

As an embodiment of the present invention, the reset assembly includes a protrusion fixedly installed on a side wall of the receiving box 7, a baffle 23 fixedly installed in the receiving box 7, a spring housing 22 rotatably connected to the baffle 23, a second spring 21 disposed in the spring housing 22, and a movable rod 20 having one end inserted into the spring housing 22 and connected to the second spring 21, wherein the other end of the movable rod 20 is rotatably connected to the screening plate 16.

Under initial condition, No. two spring 21 remains tensile state throughout for in-process that accepts case 7 to vibrate, screening plate 16 all the time with protruding butt, simultaneously under the effect of connecting rod 19, curb plate 18 also remains closed state, and after the plastic granules screening is accomplished, accepts case 7 and is lifted to resisting lever 17 and screening plate 16 butt under the effect of the subassembly of picking up, supports the upset of lever 17 drive screening plate 16, and makes curb plate 18 open through connecting rod 19.

EXAMPLE III

As an embodiment of the present invention, the oscillating assembly includes a power device 9 fixedly mounted on the mounting plate 8, a cam 11 rotatably mounted on the mounting plate 8 and connected to an output shaft of the power device 9, and a connecting structure connected to the cam 11 in a rolling manner and slidably disposed on the fixed shaft 2 through a limiting structure, the connecting structure is connected to the receiving box 7 and the raising assembly, and the output shaft of the power device 9 is fixedly connected to the first gear 10.

When the power device 9 works, the cam 11 is driven to rotate, the connecting structure of the cam 11 is in rolling connection, when the connecting part of the cam 11 and the connecting structure is changed from the short axis of the cam 11 to the long axis of the cam 11, the connecting structure rises to drive the position of the receiving box 7 to rise, and when the connecting part of the cam 11 and the connecting structure is changed from the long axis of the cam 11 to the short axis of the cam 11, the connecting structure falls under the action of the elastic component and is always in rolling connection with the cam 11, so that the receiving box 7 is vibrated, and the screening speed of the screening plate 16 is increased.

The limiting structure comprises a limiting block 3 and a groove, wherein the limiting block 3 is symmetrically and fixedly arranged on the fixed shaft 2, the groove is formed in the connecting assembly and matched with the limiting block 3, and the limiting block 3 is in a long strip shape.

Connecting structure is high frequency vibrations about 2 fixed axles when accepting case 7 to vibrate, through setting up stopper 3 and setting up the recess on connecting structure, makes the in-process of accepting the vibration of case 7, and it can not take place the angular variation along fixed axle 2, guarantees the stability of device.

The connecting structure comprises a sliding sleeve 4 arranged on the fixed shaft 2 in a sliding mode and a fixing piece 6 fixedly connected with the sliding sleeve 4.

The inner wall of the sliding sleeve 4 is provided with the groove, one side of the fixing piece 6 is fixedly connected with the bearing box 7, the other side of the fixing piece is rotatably provided with a pulley 12 in rolling connection with the cam 11, the fixing piece 6 is further provided with a guide rail, and the guide rail is matched with the lifting assembly.

The pulley 12 reduces the friction between the cam 11 and the fixing piece 6, prevents the cam 11 and the fixing piece 6 from being worn due to long-time action, and meanwhile, the fixing piece 6 is provided with a guide rail which is matched with the lifting assembly to realize that the lifting assembly periodically lifts the fixing piece 6;

the guide rail is elongated.

Example four

As an embodiment of the present invention, the elastic assembly includes a limiting plate fixedly mounted at an upper end portion of the fixed shaft 2, and a first spring 5 sleeved on the fixed shaft 2, one end of the first spring 5 abuts against the limiting plate, the other end abuts against the sliding sleeve 4, and the upper portion of the limiting plate is fixedly mounted with the abutting rod 17.

Through setting up spring 5 and acting on sliding sleeve 4 for keep rolling connection state between pulley 12 on the mounting 6 and the cam 11 all the time, avoid when the junction of cam 11 and pulley 12 changes from the major axis of cam 11 to the minor axis, because there is inertia in the receiving box 7 and leads to pulley 12 and cam 11 to break away from, lead to shaking not thorough phenomenon.

EXAMPLE five

As an embodiment of the present invention, the raising assembly includes a rotating disc 14 fixedly connected to the second gear 13, and a supporting rod 15 having one end hinged to the rotating disc 14, and the other end of the supporting rod 15 is provided with a sliding block slidably disposed in the guide rail.

After a plurality of rings of rotation of first gear 10, No. two gears 13 rotate certain angle to through carousel 14 and bracing piece 15, make the sliding block move to the upper edge of guide rail, No. two gears 13 continue to rotate this moment, and bracing piece 15 acts on mounting 6, and drive and hold case 7 upward movement is to propping pole 17 and sieve plate 16 butt, and makes sieve plate 16 take place the upset.

EXAMPLE six

As an embodiment of the invention, the plastic granule screening device and the use method of the screening method for plastic granulation are also provided, wherein the plastic granule screening device comprises the following steps:

Taking an embodiment combining all the features described in the present application as an example, in practical use, a proper amount of plastic particles are poured into the receiving box 7, the power device 9 is started, the power device 9 drives the cam 11 to rotate and acts on the pulley 12 on the fixed member, when the joint between the cam 11 and the pulley 12 changes from the short axis of the cam 11 to the long axis, the pulley 12 drives the fixed member 6 and the sliding sleeve 4 to move upwards so as to move the receiving box 7 upwards, when the joint between the cam 11 and the pulley 12 changes from the long axis of the cam 11 to the short axis of the cam, the fixed member 6 and the sliding sleeve 4 are forced to keep a rolling connection with the cam 11 under the action of the spring 5 so as to drive the receiving box 7 to move downwards, and when the cam 11 continuously rotates, the above process is repeated so that the receiving box 7 vibrates, and the screening speed of the screening plate 16 is increased, at cam 11 rotation a plurality of rings in-process, plastic granules is accomplished by the screening, No. two gears 13 of a gear 10 drive simultaneously rotate, rotate with drive carousel 14, and drive mounting 6 and the upwards emergence motion of sliding sleeve 4 through bracing piece 15, so that take over case 7 upward movement to support pole 17 and screening board 16 butt, the upset takes place for screening board 16, drive curb plate 18 through connecting rod 19 and open, the plastic granules that are not conform to the requirement on the screening board 19 are the parabola motion under the action of gravity, from curb plate 18 department drop take over case 7.

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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A plastic granules sieving mechanism for in plastics pelletization, characterized by, includes:

the mounting base (1) is horizontally arranged, a fixed shaft (2) perpendicular to the mounting base (1) is fixedly mounted on the mounting base (1), and a supporting rod (17) is fixedly mounted on the upper portion of the fixed shaft (2);

the plastic particle filter comprises a bearing box (7), wherein the bearing box (7) is movably arranged on the mounting seat (1), a reversible screening plate (16) is arranged in the bearing box (7) in a rotating mode, a plurality of through holes with the same diameter are formed in the screening plate (16) at equal intervals to filter plastic particles with the required size, the screening plate (16) is movably arranged on a side plate (18) on the side wall of the bearing box (7) through a connecting rod (19), and when the screening plate (16) is overturned, the connecting rod (19) drives the side plate (18) to be opened;

a reset assembly connecting the receiving box (7) and the screening plate (16), the reset assembly being used for keeping the screening plate (16) in a horizontal state and keeping the side plates (18) in a closed state under the condition of no external force;

the oscillating assembly is arranged on the mounting seat (1) and is connected with the bearing box (7), and the oscillating assembly is matched with an elastic assembly arranged at the upper part of the fixed shaft (2) to drive the bearing box (7) to vibrate at high frequency;

the lifting assembly is connected with the bearing box (7), the lifting assembly is matched with the vibration assembly to drive the bearing box (7) to periodically lift the bearing box (7) to the abutting rod (17) and the screening plate (16) in an abutting mode when the bearing box (7) is subjected to high-frequency vibration, so that the screening plate (16) is turned, and the lifting assembly is arranged on the mounting seat (1).

2. The plastic particle screening device for plastic granulating as claimed in claim 1, wherein the oscillating assembly is connected with the raising assembly through a speed reducing assembly, the speed reducing assembly comprises a mounting plate (8) vertically and fixedly mounted on the mounting base (1), a first gear (10) rotatably mounted on the mounting plate (8) and connected with the oscillating assembly, and a second gear (13) engaged with the first gear (10) and rotatably mounted on the mounting plate (8);

wherein, the second gear (13) is connected with the lifting component.

3. The plastic particle screening device for plastic granulating as claimed in claim 1, wherein the reset assembly comprises a protrusion fixedly mounted on a side wall of the receiving box (7), a baffle plate (23) fixedly mounted in the receiving box (7), a spring housing (22) rotatably connected with the baffle plate (23), a second spring (21) arranged in the spring housing (22), and a movable rod (20) with one end inserted into the spring housing (22) and connected with the second spring (21), and the other end of the movable rod (20) is rotatably connected with the screening plate (16).

4. The plastic particle screening device for plastic granulating as claimed in claim 2, wherein the oscillating assembly comprises a power device (9) fixedly mounted on the mounting plate (8), a cam (11) connected with an output shaft of the power device (9) and rotatably mounted on the mounting plate (8), and a connecting structure connected with the cam (11) in a rolling manner and slidably arranged on the fixed shaft (2) through a limiting structure, the connecting structure is connected with the receiving box (7) and the picking assembly, and the output shaft of the power device (9) is fixedly connected with the first gear (10).

5. A plastic particle screening device for use in plastic granulating apparatus as claimed in claim 4, wherein said limiting structure comprises a limiting block (3) symmetrically fixed on said fixed shaft (2), a groove provided on said connecting assembly and adapted to said limiting block (3), wherein said limiting block (3) is in the shape of a long strip.

6. A plastic granules screening device for use in plastic granulation according to claim 4, wherein said connection structure comprises a sliding sleeve (4) slidably arranged on said fixed shaft (2), a fixing member (6) fixedly connected to said sliding sleeve (4);

the inner wall of the sliding sleeve (4) is provided with a groove, one side of the fixing piece (6) is fixedly connected with the bearing box (7), the other side of the fixing piece is rotatably provided with a pulley (12) in rolling connection with the cam (11), the fixing piece (6) is further provided with a guide rail, and the guide rail is matched with the lifting assembly.

7. The plastic particle screening device for plastic granulation as claimed in claim 6, wherein the elastic component comprises a limiting plate fixedly mounted on the upper end of the fixed shaft (2), and a first spring (5) sleeved on the fixed shaft (2), one end of the first spring (5) abuts against the limiting plate, the other end of the first spring abuts against the sliding sleeve (4), and the abutting rod (17) is fixedly mounted on the upper portion of the limiting plate.

8. The plastic particle screening device for plastic granulating as claimed in claim 6, wherein the picking assembly comprises a rotary disc (14) fixedly connected with the second gear (13), and a support rod (15) with one end hinged on the rotary disc (14), and the other end of the support rod (15) is provided with a sliding block which is slidably arranged in the guide rail.

9. A method of using the apparatus for screening plastic granules for use in plastic pelletization according to any one of claims 1 to 8, comprising the steps of: