CN110900899B

CN110900899B - Waste plastic crushing device

Info

Publication number: CN110900899B
Application number: CN201911379677.XA
Authority: CN
Inventors: 苏祖伟
Original assignee: Chongqing Datongmao Textile Technology Co ltd
Current assignee: Chongqing Datongmao Textile Technology Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2022-06-24
Anticipated expiration: 2039-12-27
Also published as: CN110900899A

Abstract

The invention relates to the technical field of broken plastics. Discloses a waste plastic crushing device, which comprises a box body, wherein a feeding hole and a discharging hole are formed in the box body; the inner walls of two sides of the box body are respectively provided with a transverse groove, a first wedge block is connected in the transverse grooves in a sliding mode, a first spring is arranged between the first wedge block and the transverse grooves, and one side, close to the adjacent first wedge block, of the first wedge block is provided with a plurality of crushing teeth; a screening mechanism and a secondary crushing mechanism are sequentially arranged in the box body from top to bottom, and the screening mechanism is positioned below the transverse groove; the feeding hole is positioned above the transverse groove, and the discharging hole is positioned below the secondary crushing mechanism; the box body is internally provided with a power mechanism used for driving the pressing block to vertically reciprocate. The scheme mainly solves the problems that the crushing effect of the existing crusher is not good, and the qualified rate of plastic particles is reduced.

Description

Waste plastic crushing device

Technical Field

The invention relates to the technical field of broken plastics.

Background

Waste plastics are a popular term and do not refer to waste, old and useless plastic products. Most plastic products, especially a large number of disposable plastic products, have no big change in the properties of the plastic material after use, so that the plastic products can be recycled and reprocessed into plastic products by proper methods for reuse.

At present, waste plastics are recycled mainly by crushing and then are reused, the existing crushing mode is mainly to put the waste plastics into a crusher for crushing treatment, crushed plastic particles need to be screened by workers, plastic particles with qualified sizes are selected for reprocessing, and plastic particles with unqualified sizes are crushed again; the traditional crusher can only be used for single crushing treatment of waste plastics, so that the crushing effect is poor, and the qualification rate of plastic particles is reduced.

Disclosure of Invention

The invention aims to provide a waste plastic crushing device to solve the problems that an existing crusher is poor in crushing effect and reduces the qualified rate of plastic particles.

In order to achieve the above object, the basic scheme of the invention is as follows: the waste plastic crushing device comprises a box body, wherein a feeding hole and a discharging hole are formed in the box body; the inner walls of two sides of the box body are respectively provided with a transverse groove, a first wedge block is connected in the transverse grooves in a sliding mode, a first spring is arranged between the first wedge block and the transverse grooves, and one side, close to the adjacent first wedge block, of the first wedge block is provided with a plurality of crushing teeth; a screening mechanism and a secondary crushing mechanism are sequentially arranged in the box body from top to bottom, and the screening mechanism is positioned below the transverse groove; the feeding hole is positioned above the transverse groove, and the discharging hole is positioned below the secondary crushing mechanism; the box body is provided with a pressing block used for extruding the two first wedge blocks, the pressing block is positioned above the two first wedge blocks, and a power mechanism used for driving the pressing block to vertically reciprocate is arranged in the box body.

The advantages of the basic scheme are:

1. according to the scheme, waste plastics are placed into the box body through the feeding hole, so that the waste plastics are positioned between the pressing block and the two first wedge blocks; the pressing block is driven by the power mechanism to vertically reciprocate, when the pressing block moves downwards, the pressing block extrudes the two first wedge blocks to move towards opposite directions, so that a gap is formed after the two first wedge blocks move, and waste plastics fall into the gap of the two first wedge blocks; when the pressing block moves upwards, the first wedge blocks reset under the action of the first springs, the two first wedge blocks move in opposite directions, and crushing teeth on the two first wedge blocks move in opposite directions to perform primary crushing treatment on the waste plastics to obtain plastic particles; screening the plastic particles through a screening mechanism, crushing the plastic particles subjected to primary crushing treatment again through a secondary crushing mechanism to obtain plastic particles with qualified particle size, and taking out the plastic particles from a discharge port; compared with the prior art, the scheme has the advantages that the waste plastic is subjected to two-stage crushing treatment, so that the waste plastic is crushed more thoroughly, the crushing effect on the waste plastic is enhanced on one hand, and the yield of plastic particles is also improved on the other hand.

2. This scheme is through the broken tooth relative motion on two first voussoirs to waste plastic one-level crushing treatment, and the plastic granules that the particle diameter is qualified pass screening mechanism downstream, and the plastic granules that the particle diameter is unqualified then continues to be located between two first voussoirs, carries out crushing treatment many times to the plastic granules that the particle diameter is unqualified through the reciprocating motion of two first voussoirs for the particle diameter of all plastic granules is whole qualified, has strengthened crushing effect.

3. This scheme can be used for extrudeing two first voussoirs through the briquetting and remove to opposite direction, can also extrude the waste plastic and remove to the intermediate position of two first voussoirs, and when two first voussoirs produced the intermittent type of being convenient for, waste plastic can get into in the clearance of two first voussoirs completely.

Further, the power mechanism comprises a first motor fixedly connected with the box body and a vertical groove formed in the inner wall of the box body, a rotating shaft extending into the box body is fixedly connected to an output shaft of the first motor, the rotating shaft is rotatably connected with the box body, and a first cam is arranged on the rotating shaft; a lifting block which is abutted against the first cam is connected in the vertical groove in a sliding manner, and a second spring is arranged between the lifting block and the vertical groove; the lifting block is fixedly connected with the pressing block.

Through the arrangement, the output shaft of the first motor drives the rotating shaft to rotate, and the rotating shaft drives the first cam to rotate; when the lifting block is extruded by the convex part of the first cam, the lifting block moves downwards, and the second spring is compressed; when the boss of first cam does not extrude the elevator, the elevator upwards moves under the effect of second spring, consequently, extrudees the elevator cooperation second spring through first cam intermittent type and can drive the vertical reciprocating motion of elevator, and then drives the vertical reciprocating motion of briquetting.

Further, the screening mechanism comprises a first screen, a circular shaft and a fixed table fixedly connected to the inner wall of the box body; the round shaft is rotatably connected with the box body, a belt is arranged between the round shaft and the rotating shaft, and a driving bevel gear is arranged on the round shaft; a guide groove is transversely formed in the fixed table, the first screen is connected with the guide groove in a sliding mode, a third spring is arranged between the first screen and the guide groove, and one end, far away from the third spring, of the first screen is connected with the inner wall of the box body in a sliding mode; the bottom of the fixed table is rotatably connected with a side shaft, and a second cam and a driven bevel gear meshed with the driving bevel gear are arranged on the side shaft; the top of the first screen is abutted against the bottom of the first wedge block, and the bottom of the first screen is provided with a side block abutted against the second cam.

Through the arrangement, when the rotating shaft rotates, the rotating shaft drives the circular shaft to rotate through the belt, the circular shaft drives the driving bevel gear to rotate, the driving bevel gear is meshed with the driven bevel gear, so that the driven bevel gear rotates, the driven bevel gear drives the side shaft to rotate, and the side shaft drives the second cam to rotate; when the bulge of the second cam extrudes the side block, the side block drives the first screen to move in the guide groove, and the third spring is stretched; when the convex part side block of the second cam is used, the first screen is reset under the action of the third spring; therefore, the first screen can transversely reciprocate in the guide groove by intermittently pressing the side block by the convex part of the second cam and matching with the third spring. Screening effect can be strengthened to horizontal reciprocating motion's an aspect, and the another party can also avoid first screen cloth to cause the jam at all.

Furthermore, the second-stage crushing mechanism comprises a second motor fixedly connected to the inner wall of the box body and an auxiliary shaft rotatably connected with the inner wall of the box body, a first crushing roller and a driving gear are arranged on an output shaft of the second motor, and a second crushing roller and a driven gear meshed with the driving gear are arranged on the auxiliary shaft.

Through the arrangement, the output shaft of the second motor drives the first crushing roller and the driving gear to rotate clockwise, the driving gear is meshed with the driven gear to further drive the driven gear to rotate reversely, the driven gear drives the auxiliary shaft to rotate reversely, and the auxiliary shaft drives the second crushing roller to rotate reversely; the plastic particles after the primary crushing treatment move to a position between the first crushing roller and the second crushing roller, the secondary crushing treatment of the plastic particles is completed through the first crushing roller and the second crushing roller,

furthermore, both sides of the pressing block are provided with limiting grooves, second wedge blocks used for extruding the first wedge blocks are connected in the limiting grooves in a sliding mode, and fourth springs are arranged between the second wedge blocks and the limiting grooves.

Through the arrangement, during the period that the pressing block drives the second wedge block to move downwards, the second wedge block is abutted against the first wedge block, the second wedge block can push the center positions of the two first wedge blocks of the waste plastic to move on the one hand, and on the other hand, the waste plastic adhered to the first wedge blocks can be scraped.

Furthermore, a plurality of bulges are arranged on one end of the second wedge block, which is far away from the fourth spring.

Through above-mentioned setting, replace second voussoir and first voussoir contact through the arch, strengthened the effect of scraping off the old and useless plastic of adhesion on first voussoir.

Furthermore, one end, far away from the fourth spring, of the second wedge block is hinged with a plurality of scraping pieces, and the scraping pieces are located between the two adjacent bulges.

Through the arrangement, the scraping blade moves on the first wedge block, so that the scraping effect on the waste plastics adhered to the first wedge block can be enhanced;

furthermore, a plurality of groups of auxiliary grooves are formed in one end, far away from the fourth spring, of the second wedge block, and each group of auxiliary grooves are located between two adjacent protrusions; the auxiliary grooves comprise stable grooves symmetrically arranged by taking the scraping blade as a center, the stable grooves are connected with stable blocks in a sliding mode, and fifth springs are arranged between the two sides of each stable block and the corresponding stable groove; the stabilizing block is hinged with a linkage arm, and the linkage arm is hinged with the scraping blade.

Through the arrangement, as the scraping blade is hinged to the second wedge block, the scraping blade is blocked by the waste plastic to swing and the fifth spring deforms aiming at the waste plastic with a strong adhesion effect, so that the acting force of the scraping blade on the waste plastic is longer and the scraping blade is more fully contacted; when the fifth spring deformation to the limit, can strike off the waste plastic that the adhesion effect is stronger through the doctor-bar, strengthened scraping effect. In addition, the swinging scraping blade drives the stabilizing block to slide in the stabilizing groove through the linkage arm, so that the swinging stability of the scraping blade can be improved; and moreover, the scraping blade, the linkage arm and the second wedge block form a triangle, so that the swinging stability of the scraping blade can be improved according to the stability of the triangle.

Further, a sealing cover is detachably connected to the discharge hole.

Through the arrangement, the discharge hole is sealed through the sealing cover before the waste plastic is crushed, so that the crushed plastic particles are prevented from flying out of the discharge hole; and, because threaded connection has the auto-lock nature, and then improved the sealed stability of discharge gate.

Further, the bottom in the box body is obliquely and downwards inclined from left to right.

Through the arrangement, the plastic particles after the two-stage crushing treatment move rightwards under the guiding action of the bottom of the box body, and when the plastic particles need to be taken out, the sealing cover and the discharge hole are separated.

Drawings

FIG. 1 is a sectional view in a front view of an embodiment of an apparatus for crushing waste plastics according to the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is an enlarged view of FIG. 1 at B;

FIG. 4 is a sectional view in the front view of a waste plastic crushing apparatus according to an embodiment of the present invention;

FIG. 5 is an enlarged view at C of FIG. 4;

fig. 6 is an enlarged view of fig. 5 at D.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a box body 1, a feeding hole 2, a discharging hole 3, a transverse groove 4, a first wedge block 5, a first spring 6, a pressing block 7, a first motor 8, a vertical groove 9, a rotating shaft 10, a first cam 11, a lifting block 12, a second spring 13, a first screen 14, a circular shaft 15, a fixed platform 16, a belt 17, a driving bevel gear 18, a guide groove 19, a third spring 20, a side shaft 21, a second cam 22, a driven bevel gear 23, a side block 24, an auxiliary shaft 25, a first crushing roller 26, a second crushing roller 27, a limiting groove 28, a second wedge block 29, a fourth spring 30, a protrusion 31, a scraping blade 32, a stabilizing groove 33, a stabilizing block 34, a fifth spring 35, a linkage arm 36 and a sealing cover 37.

Example one

Substantially as shown in figures 1, 2 and 3: waste plastic's breaker, including box 1, it has feed inlet 2 and discharge gate 3 to open on the box 1, and feed inlet 2 is located the left upper portion of box 1, and discharge gate 3 is located the lower extreme on box 1 right side. The inner walls of two sides of the box body 1 are respectively provided with a transverse groove 4, a first wedge block 5 is connected in the transverse grooves 4 in a sliding mode, a first spring 6 is fixedly connected between the first wedge block 5 and the transverse grooves 4, and a plurality of crushing teeth are fixedly connected to one side, close to the adjacent first wedge block 5, of the first wedge block 5; the two first wedge blocks 5 are arranged in an abutting mode, and the crushing teeth on the first wedge block 5 on the left side are meshed with the crushing teeth on the first wedge block 5 on the right side.

The box body 1 is internally provided with a power mechanism for driving the pressing block 7 to vertically reciprocate, the power mechanism comprises a first motor 8 fixedly connected with the box body 1 and vertical grooves 9 formed in the inner walls of the two sides of the box body 1, an output shaft of the first motor 8 is fixedly connected with a rotating shaft 10 extending into the box body 1, the rotating shaft 10 is rotatably connected with the box body 1, and a first cam 11 is fixedly connected to the rotating shaft 10; a lifting block 12 which is abutted against the first cam 11 is connected in the vertical groove 9 in a sliding manner, and a second spring 13 is fixedly connected between the lifting block 12 and the vertical groove 9; the lifting block 12 is fixedly connected with the pressing block 7, and when the lifting block 12 does not work, a gap exists between the two first wedge blocks 5. Both sides of the pressing block 7 are provided with limiting grooves 28, a second wedge block 29 for extruding the first wedge block 5 is connected in the limiting grooves 28 in a sliding mode, and a fourth spring 30 is fixedly connected between the second wedge block 29 and the limiting grooves 28.

A screening mechanism and a secondary crushing mechanism are sequentially arranged in the box body 1 from top to bottom, and the screening mechanism is positioned below the transverse groove 4; the feeding port 2 is positioned above the transverse groove 4, and the discharging port 3 is positioned below the secondary crushing mechanism. The screening mechanism comprises a first screen 14, a round shaft 15 and a fixed table 16 fixedly connected on the inner wall of the box body 1; the round shaft 15 is rotationally connected with the box body 1, a tensioned belt 17 is sleeved between the round shaft 15 and the rotating shaft 10, and a driving bevel gear 18 is fixedly connected on the round shaft 15; a guide groove 19 is transversely formed in the fixed table 16, the first screen 14 is connected with the guide groove 19 in a sliding mode, a third spring 20 is fixedly connected between the first screen 14 and the guide groove 19, and the left end of the first screen 14 is connected with the inner wall of the box body 1 in a sliding mode; a side shaft 21 is rotatably connected to the bottom of the fixed table 16, and a second cam 22 and a driven bevel gear 23 engaged with the driving bevel gear 18 are fixedly connected to the side shaft 21; the top of the first screen 14 abuts against the bottom of the first wedge 5, and the bottom of the first screen 14 is fixedly connected with a side block 24 abutting against the second cam 22.

The second-stage crushing mechanism comprises a second motor fixedly connected to the inner wall of the box body 1 and an auxiliary shaft 25 rotatably connected to the inner wall of the box body 1, a first crushing roller 26 and a driving gear are fixedly connected to an output shaft of the second motor, and a second crushing roller 27 and a driven gear meshed with the driving gear are fixedly connected to the auxiliary shaft 25.

The specific implementation process is as follows:

waste plastics are put into the box body 1 through the feed inlet 2, so that the waste plastics are positioned between the pressing block 7 and the two first wedge blocks 5; and, first voussoir 5 can be under the effect of direction to the waste plastic, makes waste plastic to the intermediate position of two voussoirs removal.

Starting the first motor 8 and the second motor, wherein an output shaft of the first motor 8 drives a rotating shaft 10 to rotate, and the rotating shaft 10 drives a first cam 11 to rotate; when the protrusion 31 of the first cam 11 presses the lifting block 12, the lifting block 12 moves downward, and the second spring 13 is compressed; when the boss 31 of the first cam 11 does not extrude the lifting block 12, the lifting block 12 moves upwards under the action of the second spring 13, and therefore the lifting block 12 can be driven to vertically reciprocate by intermittently extruding the first cam 11 and matching the second spring 13 with the lifting block 12, and further the pressing block 7 is driven to vertically reciprocate.

When the press block 7 moves downwards, the second wedge block 29 presses the first wedge block 5, so that the second wedge block 29 moves towards the direction of the fourth spring 30 along the path of the limiting groove 28, and the fourth spring 30 is compressed; when the fourth spring 30 deforms to the limit, the second wedge block 29 moves in the limiting groove 28 to the limit position, the pressing block 7 continues to move downwards, the second wedge blocks 29 on the two sides of the pressing block 7 extrude the two first wedge blocks 5 to move in opposite directions, so that the first wedge blocks 5 move along the path of the transverse groove 4, the first spring 6 is compressed, and a gap is formed after the two first wedge blocks 5 move; the pressing block 7 continues to move downwards, the waste plastics are extruded by the pressing block 7 to fall into the gap between the two first wedge blocks 5 and are blocked by the first screen 14; when the press block 7 moves upwards, the second wedge blocks 29 on the two sides of the press block 7 have no effect on the two first wedge blocks 5, the first wedge blocks 5 are reset under the effect of the first springs 6, and the second wedge blocks 29 are reset under the effect of the fourth springs 30; two first voussoirs 5 move towards each other, through the broken tooth relative motion on two first voussoirs 5 to waste plastic one-level crushing treatment, the plastic granules that the particle size is qualified pass first screen cloth 14 and move down, the plastic granules that the particle size is unqualified then continues to be located between two first voussoirs 5, through the reciprocating motion of two first voussoirs 5 to carry out crushing treatment many times to the plastic granules that the particle size is unqualified for the particle size of all plastic granules is all qualified, again through first screen cloth 14 downstream. And, during the briquetting 7 drives second voussoir 29 to move downwards, second voussoir 29 offsets with first voussoir 5, can promote the central point of two first voussoirs 5 of waste plastics on the one hand and remove through second voussoir 29, on the other hand can also scrape off the waste plastics that adhere to on first voussoir 5.

An output shaft of the second motor drives the first crushing roller 26 and the driving gear to rotate clockwise, the driving gear is meshed with the driven gear to further drive the driven gear to rotate reversely, the driven gear drives the auxiliary shaft 25 to rotate reversely, and the auxiliary shaft 25 drives the second crushing roller 27 to rotate reversely; the plastic particles after the primary crushing treatment move to a position between the first crushing roller 26 and the second crushing roller 27, the plastic particles are subjected to secondary crushing treatment through the first crushing roller 26 and the second crushing roller 27, plastic particles with qualified particle sizes are obtained, and then the plastic particles are taken out from the discharge port 3. This scheme is through carrying out the two-stage crushing to waste plastic for waste plastic is broken more thoroughly, has strengthened the crushing effect to waste plastic on the one hand, and on the other hand has also improved the yield of plastic granules.

When the rotating shaft 10 rotates, the rotating shaft 10 drives the circular shaft 15 to rotate through the belt 17, the circular shaft 15 drives the driving bevel gear 18 to rotate, the driving bevel gear 18 is in gear engagement with the driven bevel gear 23, so that the driven bevel gear 23 rotates, the driven bevel gear 23 drives the side shaft 21 to rotate, and the side shaft 21 drives the second cam 22 to rotate; when the bulge 31 of the second cam 22 presses the side block 24, the side block 24 drives the first screen 14 to move in the guide groove 19, and the third spring 20 is stretched; when the boss 31 of the second cam 22 is engaged with the side block 24, the first screen 14 is restored by the third spring 20; therefore, the first screen 14 can be transversely reciprocated in the guide groove 19 by intermittently pressing the side block 24 with the projection 31 of the second cam 22 in cooperation with the third spring 20. On the one hand, the transverse reciprocating motion can enhance the screening effect, and on the other hand, the first screen 14 can be prevented from being blocked.

In this embodiment, a plurality of protrusions 31 are fixed on an end of the second wedge 29 away from the fourth spring 30. The scraping effect of the waste plastic adhering to the first wedge 5 is enhanced by the contact of the protrusion 31 with the first wedge 5 instead of the second wedge 29.

Example two

Substantially as shown in figures 4, 5 and 6: the structure and implementation of the second embodiment are substantially the same as those of the first embodiment, and the difference is that: the end of the second wedge 29 away from the fourth spring 30 is hinged with a plurality of scraping blades 32, and the scraping blades 32 are located between two adjacent protrusions 31. A plurality of groups of auxiliary grooves are formed in one end, far away from the fourth spring 30, of the second wedge 29, and each group of auxiliary grooves is located between two adjacent protrusions 31; the auxiliary grooves comprise stabilizing grooves 33 which are symmetrically arranged by taking the scraping blade 32 as a center, stabilizing blocks 34 are connected in the stabilizing grooves 33 in a sliding manner, and fifth springs 35 are fixedly connected between the two sides of each stabilizing block 34 and the stabilizing grooves 33; the stabilizing block 34 is hinged with a linkage arm 36, and the linkage arm 36 is hinged with the scraping blade 32.

The specific implementation process is as follows:

the scraping blade 32 moves on the first wedge block 5, so that the scraping effect on the waste plastics adhered to the first wedge block 5 can be enhanced; moreover, as the scraping blade 32 is hinged to the second wedge block 29, for the waste plastics with strong adhesion effect, the scraping blade 32 swings under the blocking of the waste plastics, and the fifth spring 35 deforms, so that the acting force of the scraping blade 32 on the waste plastics is longer, and the contact is more sufficient; when the fifth spring 35 deforms to the limit, the scraping effect is enhanced by scraping the waste plastic with the strong adhesion effect through the scraping blade 32. In addition, the swinging scraping blade 32 drives the stabilizing block 34 to slide in the stabilizing groove 33 through the linkage arm 36, so that the swinging stability of the scraping blade 32 can be improved; moreover, the scraping blade 32, the linkage arm 36 and the second wedge block 29 form a triangle, and the swinging stability of the scraping blade 32 can be improved according to the stability of the triangle.

In this embodiment, the bottom of the box 1 is inclined downward from left to right, and the discharge port 3 is screwed with a sealing cover 37. Before the waste plastic is crushed, the discharge port 3 is sealed by a sealing cover 37, so that the crushed plastic particles are prevented from flying out of the discharge port 3; moreover, the threaded connection has self-locking property, so that the sealing stability of the discharge port 3 is improved; the plastic particles after two-stage crushing move rightwards under the guiding action of the bottom of the box body 1, and when the plastic particles need to be taken out, the sealing cover 37 and the discharge port 3 are separated.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and/or features of the schemes is not described herein in excess. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. Waste plastic's breaker includes the box, its characterized in that: a feed inlet and a discharge outlet are formed in the box body; the inner walls of two sides of the box body are respectively provided with a transverse groove, a first wedge block is connected in the transverse grooves in a sliding mode, a first spring is arranged between the first wedge block and the transverse grooves, and one side, close to the adjacent first wedge block, of the first wedge block is provided with a plurality of crushing teeth; a screening mechanism and a secondary crushing mechanism are sequentially arranged in the box body from top to bottom, and the screening mechanism is positioned below the transverse groove; the feeding hole is positioned above the transverse groove, and the discharging hole is positioned below the secondary crushing mechanism; the box body is internally provided with a power mechanism for driving the pressing block to vertically reciprocate; both sides of the pressing block are provided with limiting grooves, second wedge blocks used for extruding the first wedge blocks are connected in the limiting grooves in a sliding mode, and fourth springs are arranged between the second wedge blocks and the limiting grooves; the power mechanism comprises a first motor fixedly connected with the box body and a vertical groove formed in the inner wall of the box body, a rotating shaft extending into the box body is fixedly connected to an output shaft of the first motor and is rotatably connected with the box body, and a first cam is arranged on the rotating shaft; a lifting block which is abutted against the first cam is connected in the vertical groove in a sliding manner, and a second spring is arranged between the lifting block and the vertical groove; the lifting block is fixedly connected with the pressing block; the screening mechanism comprises a first screen, a circular shaft and a fixed table fixedly connected to the inner wall of the box body; the round shaft is rotatably connected with the box body, a belt is arranged between the round shaft and the rotating shaft, and a driving bevel gear is arranged on the round shaft; a guide groove is transversely formed in the fixed table, the first screen is connected with the guide groove in a sliding mode, a third spring is arranged between the first screen and the guide groove, and one end, far away from the third spring, of the first screen is connected with the inner wall of the box body in a sliding mode; the bottom of the fixed table is rotatably connected with a side shaft, and a second cam and a driven bevel gear meshed with the driving bevel gear are arranged on the side shaft; the top of the first screen is abutted against the bottom of the first wedge block, and the bottom of the first screen is provided with a side block abutted against the second cam.

2. The waste plastic crushing device according to claim 1, wherein: the secondary crushing mechanism comprises a second motor fixedly connected to the inner wall of the box body and an auxiliary shaft rotatably connected with the inner wall of the box body, a first crushing roller and a driving gear are arranged on an output shaft of the second motor, and a second crushing roller and a driven gear meshed with the driving gear are arranged on the auxiliary shaft.

3. The waste plastic crushing device according to claim 2, characterized in that: and a plurality of bulges are arranged at one end of the second wedge block, which is far away from the fourth spring.

4. The waste plastic crushing device according to claim 3, characterized in that: one end, far away from the fourth spring, of the second wedge block is hinged with a plurality of scraping pieces, and the scraping pieces are located between the two adjacent bulges.

5. The waste plastic crushing device according to claim 4, characterized in that: a plurality of groups of auxiliary grooves are formed in one end, far away from the fourth spring, of the second wedge block, and each group of auxiliary grooves are located between two adjacent bulges; the auxiliary grooves comprise stabilizing grooves symmetrically arranged by taking the scraping blades as centers, stabilizing blocks are connected in the stabilizing grooves in a sliding mode, and fifth springs are arranged between the two sides of each stabilizing block and the stabilizing grooves; the stabilizing block is hinged with a linkage arm, and the linkage arm is hinged with the scraping blade.

6. The apparatus for crushing waste plastics according to claim 5, wherein: the discharge port is detachably connected with a sealing cover.

7. The waste plastic crushing device according to claim 6, characterized in that: the bottom in the box body is obliquely and downwards inclined from left to right.