A screening device for a crushing material production line for automatically screening impurities in waste plastics

Abstract

The invention discloses a screening device for a crushing material production line for automatically screening impurities of waste plastics, belonging to the technical field of garbage recycling, comprising a supporting box body, wherein an adjustable crushing and screening component is connected to the upper end of the supporting box body, a driving component is connected to the left and right side walls of the supporting box body, a self-isolating magnetic suction component is connected to the middle of the driving component, the left and right ends of the self-isolating magnetic suction component are connected to magnetic self-switch components, a self-classifying discharging component is connected to the supporting box body below the self-isolating magnetic suction component, materials are sent to the adjustable crushing and screening component, crushed by the adjustable crushing and screening component, and then fall to the inner side of the driving component, the self-isolating magnetic suction component adsorbs and screens the materials, the magnetic self-switch component controls the self-isolating magnetic suction component to desorb impurities on the side away from each other and drop them onto the self-classifying discharging component, and the self-classifying discharging component is used for classified transportation, thereby realizing automatic adsorption screening and desorption screening of materials.

Description

Technical Field

[0001] The invention relates to the technical field of garbage recycling, and in particular to a screening device for a crushing material production line for automatically screening waste plastic impurities. Background Art

[0002] Garbage recycling is an important environmental protection measure nowadays. The recycling of plastic waste is of top priority. When recycling plastic waste, impurities other than plastics need to be screened out. At this time, screening devices are needed to screen the plastic waste.

[0003] The screening device of the prior art usually uses magnets to adsorb the iron impurities in the raw materials when screening iron impurities. However, the prior art places magnets above the raw materials on the conveyor belt for adsorption, which may cause the iron garbage to be located below other materials. Since the adsorption is only performed from one side of the garbage, it may not be adsorbed due to material obstruction or the iron impurities may drive the materials to be adsorbed on the magnet together.

[0004] Based on this, the present invention designs a screening device for a crushing material production line that automatically screens waste plastic impurities to solve the above problems. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a screening device for a crushing material production line for automatically screening impurities in waste plastics.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A screening device for a crushing material production line for automatically screening waste plastic impurities, comprising a supporting box;

[0008] The upper end of the support box is connected to an adjustable crushing and screening assembly for crushing the raw materials into various sizes;

[0009] A magnetic impurity screening component is connected to the supporting box below the adjustable crushing and screening component and is used for electromagnetically screening the raw materials crushed by the adjustable crushing and screening component;

[0010] The magnetic impurity screening component includes a driving component, a self-isolation magnetic component, a magnetic self-switch component and a self-classification and discharging component. The left and right side walls of the supporting box are connected with the driving component for driving the self-isolation magnetic component. The middle part of the driving component is connected with the self-isolation magnetic component for adsorbing and screening iron impurities in the raw material. The left and right ends of the self-isolation magnetic component are connected with magnetic self-switch components for automatically turning on and off the self-isolation magnetic component. The supporting box below the self-isolation magnetic component is connected with a self-classification and discharging component for classifying and sending out materials screened by the self-isolation magnetic component.

[0011] Furthermore, the driving assembly includes a first motor, a conveyor belt and a gear set. The first motor is fixedly connected to the upper end of the right side wall of the support box. The front and rear ends between the left and right inner walls of the support box are rotatably connected to the conveyor belts. The output end of the first motor is fixedly connected to the rollers of one group of conveyor belts, and the rollers at the same height on the left sides of the two groups of conveyor belts are connected through a gear set.

[0012] Furthermore, the self-isolation magnetic attraction component includes an isolation baffle and an electromagnetic strip. The left and right ends of the conveyor belt are fixedly connected with an isolation baffle. The two groups of isolation baffles close to each other are transmission connected. The outer end of the conveyor belt is fixedly connected with several groups of electromagnetic strips. The front and rear ends of the electromagnetic strips are connected to the magnetic self-switch component.

[0013] Furthermore, the magnetic self-switch assembly includes a powered contact and a powered contact plate, the front and rear ends of the electromagnetic strip are fixedly connected with powered contacts, the left and right inner walls of the support box are fixedly connected with powered contact plates, and the powered contact plate is slidably connected to the powered contact on one end of the conveyor belt.

[0014] Furthermore, the self-sorting discharging assembly includes an inclined material guide plate, a discharge port and a conveying mechanism. The inclined material guide plates are fixedly connected to the inner wall of the supporting box below the conveyor belt. The two groups of inclined material guide plates are provided with a discharge port on the supporting box on the side away from each other, and a conveying mechanism is provided below the conveyor belt.

[0015] Furthermore, the adjustable crushing and screening assembly includes a mounting mechanism, a screen disassembly assembly, a crushing assembly and an adjusting assembly. The mounting mechanism is connected to the top plate of the support box, the screen disassembly assembly is connected to the middle part of the mounting mechanism, the crushing assembly is connected to the mounting mechanism at the upper end of the screen disassembly assembly, the crushing assembly is connected to the adjusting assembly, and the left end of the adjusting assembly is connected to the left side wall of the mounting mechanism.

[0016] Furthermore, the mounting mechanism includes a mounting box, a feed pipe and a discharge pipe, the feed pipe is fixedly connected to the top plate of the mounting box, the discharge pipe is fixedly connected to the bottom plate of the mounting box, the discharge pipe passes through the top plate of the supporting box and is fixedly connected to the supporting box, and the lower end of the discharge pipe is located between the upper ends of the two groups of conveyor belts.

[0017] Furthermore, the screen disassembly assembly includes a support block, a sliding screen, a replacement door panel and an insertion rod. The front and rear inner walls of the installation box are fixedly connected to support blocks. The front and rear ends of the upper end of the sliding screen are respectively slidably connected to a group of support blocks. An opening is provided on the left side wall of the installation box. A replacement door panel is clamped in the opening of the left side wall of the installation box. The insertion rod passes through the left side walls of the replacement door panel and the installation box and is slidably connected to both the replacement door panel and the installation box.

[0018] Furthermore, the crushing assembly includes a second motor, a driving turntable, a rotating shaft, a straight slide groove and a support rod. The second motor is fixedly connected to the right side wall of the mounting box, and the output end of the second motor is fixedly connected to the rotating shaft. The rotating shaft passes through three groups of driving turntables, and the rightmost group of driving turntables is fixedly connected to the rotating shaft. The driving turntables are each provided with a plurality of groups of straight slide grooves around the center, and the straight slide grooves on the three groups of driving turntables correspond to each other. In each group of straight slide grooves on the same driving turntable, a group of support rods passes through the straight slide grooves and is slidably connected to the straight slide grooves, and each group of support rods passes through the straight slide grooves on three different driving turntables, and a plurality of groups of crushing knives are rotatably connected to the support rods.

[0019] Furthermore, the adjustment assembly includes a rotating drum, an adjusting dial, an adjusting inclined slide groove, an adjusting notch and an adjusting rotating block. The left end of the rotating shaft is rotatably connected in the rotating drum. The right end of the rotating drum passes through the two groups of driving dials on the left and is rotatably connected to the two groups of driving dials on the left. A group of adjusting dials are fixedly connected to the rotating drum on the left side of the leftmost driving dial and the rotating drum on the left side of the rightmost driving dial. A plurality of groups of adjusting inclined slide grooves are opened around the center of the adjusting dial. The two groups of adjusting dials have corresponding The adjusting inclined slide grooves are all passed through by the same group of support rods and are slidably connected with the support rods. An adjusting notch is provided at the left end of the rotating shaft. The right end of the adjusting rotating block is inserted into the adjusting notch. The left end of the adjusting rotating block is clamped with the left end of the rotating drum. The adjusting notch is a square groove. The right end of the adjusting rotating block is a square plug-in block. Several groups of clamping blocks are fixedly connected to the outer wall of the left end of the adjusting rotating block. Several groups of clamping grooves are provided on the inner wall of the left end of the rotating drum. The adjusting rotating block and the rotating drum are clamped through the clamping blocks and the clamping grooves.

[0020] The present invention has the following technical effects:

[0021] 1. When the raw material is crushed by the adjustable crushing and screening assembly and falls between the two conveyor belts, the first motor is started at this time, and the first motor drives the two conveyor belts to move at the same time through the discharge pipe. At this time, the electromagnetic strip is energized by replacing the door panel and the energized contact, so that the electromagnetic strip on one side of the two conveyor belts close to each other generates magnetic force and adsorbs the material between the two conveyor belts, so that the iron impurities in the material are adsorbed onto the conveyor belt, thereby realizing the screening of iron impurities in the material, and because the adsorption is carried out simultaneously on the front and back sides of the material, it avoids the inability to adsorb due to the obstruction of other impurities. Or in the case of impurities being adsorbed together, when the impurities are transported to the side of the conveyor belt away from each other, the electromagnetic strip that adsorbs the impurities drives the energized contact to move away from the energized contact plate, thereby cutting off the power to the electromagnetic strip, and then the electromagnetic strip will no longer continue to adsorb impurities. At this time, the impurities fall from the side of the conveyor belt away from each other to the side of the inclined guide plates away from each other and are discharged through the adjusting turntable. The screened material falls between the two groups of inclined guide plates and falls onto the conveying mechanism under the guidance of the inclined guide plates, and is then transported away by the conveying mechanism, realizing the automatic adsorption and screening as well as the automatic desorption and classification of iron impurities.

[0022] 2. Send the material into the installation box through the feed pipe. At this time, start the second motor. The second motor drives the rightmost driving turntable to rotate through the shaft. The shaft drives the drum to rotate through the adjusting turntable at the same time. The drum drives the adjusting turntable to rotate, so that the adjusting turntable and the driving turntable rotate at the same time. The driving turntable drives the support rod to rotate. The support rod drives the crushing knife to rotate around the shaft and crush the material. The crushed material falls onto the sliding screen and is screened by the sliding screen. When the material needs to be crushed into different sizes, pull the adjusting turntable outward. When the left side of the adjusting turntable is separated from the drum, the drum and the shaft are no longer Relatively fixed, at this time, the drum and the adjusting block are rotated in opposite directions, so that the adjusting turntable and the driving turntable are rotated in opposite directions, so that the support rods move synchronously in the direction close to or away from the rotating shaft under the limit of adjusting the inclined slide and the straight slide, thereby realizing the adjustment of the distance between the crushing knife and the sliding screen, and then the material can be crushed into the required size. At this time, it is also necessary to replace the sliding screen with the corresponding screen hole size, pull out the plug rod and take down the replacement door panel, then pull out the sliding screen and replace it with the required sliding screen and reinstall the replacement door panel, thus realizing the easy replacement of the sliding screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 The present invention is a three-dimensional screening device for a crushing material production line for automatically screening impurities in waste plastics Figure 1 ;

[0025] Figure 2 It is a schematic diagram of the conveyor belt structure of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0026] Figure 3 This is a schematic diagram of the first motor structure of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the energized contact plate of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of an isolation baffle plate of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0029] Figure 6 It is a schematic structural diagram of an adjustable crushing and screening component of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of an adjusting turntable of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0031] Figure 8 This is a schematic diagram of the support rod structure of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0032] Fig. 9 This is a schematic diagram of the structure of a driving turntable of a screening device for a crushing material production line for automatically screening impurities in waste plastics according to the present invention;

[0033] Fig.10 The present invention is a schematic diagram of the structure of an adjustable inclined chute of a screening device for a crushing material production line for automatically screening impurities in waste plastics.

[0034] The numbers in the figure represent:

[0035] 1. Support box; 2. Magnetic impurity screening component; 21. Driving component; 211. First motor; 212. Conveyor belt; 213. Gear set; 22. Self-isolation magnetic suction component; 221. Isolation baffle; 222. Electromagnetic strip; 23. Magnetic self-switch component; 231. Power contact; 232. Power contact plate; 24. Self-classification discharging component; 241. Oblique 7-shaped guide plate; 242. Discharging port; 243. Conveying mechanism; 3. Adjustable crushing and screening component; 31. Installation mechanism; 311. Installation Packing body; 312, feed pipe; 313, discharge pipe; 32, screen disassembly assembly; 321, support block; 322, sliding screen; 323, door panel removal; 324, insertion rod; 33, crushing assembly; 331, second motor; 332, driving turntable; 333, rotating shaft; 334, straight slide; 335, support rod; 336, crushing knife; 34, adjustment assembly; 341, rotating drum; 342, adjusting turntable; 343, adjusting inclined slide; 344, adjusting notch; 345, adjusting rotating block. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention will be further described below in conjunction with the embodiments. Example

[0038] Please refer to the instruction manual Figure 1-10 , a screening device for a crushing material production line for automatically screening waste plastic impurities, comprising a supporting box 1;

[0039] The upper end of the support box 1 is connected to an adjustable crushing and screening assembly 3 for crushing the raw materials into various sizes;

[0040] A magnetic impurity screening component 2 for electromagnetically screening the raw materials crushed by the adjustable crushing and screening component 3 is connected to the supporting box 1 below the adjustable crushing and screening component 3;

[0041] The magnetic impurity screening component 2 includes a driving component 21, a self-isolating magnetic component 22, a magnetic self-switching component 23 and a self-classifying discharging component 24. The left and right side walls of the supporting box 1 are connected with the driving component 21 for driving the self-isolating magnetic component 22. The middle part of the driving component 21 is connected with the self-isolating magnetic component 22 for adsorbing and screening iron impurities in the raw material. The left and right ends of the self-isolating magnetic component 22 are connected with the magnetic self-switching component 23 for automatically switching the self-isolating magnetic component 22 on and off. The supporting box 1 below the self-isolating magnetic component 22 is connected with the self-classifying discharging component 24 for classifying and sending out the materials screened by the self-isolating magnetic component 22.

[0042] The driving assembly 21 includes a first motor 211, a conveyor belt 212 and a gear set 213. The first motor 211 is fixedly connected to the upper end of the right side wall of the supporting box 1. The front and rear ends between the left and right inner walls of the supporting box 1 are rotatably connected to the conveyor belt 212. The output end of the first motor 211 is fixedly connected to the rollers of one group of the conveyor belts 212. The rollers at the same height on the left sides of the two groups of conveyor belts 212 are connected through the gear set 213.

[0043] The self-isolating magnetic attraction component 22 includes an isolation baffle 221 and an electromagnetic strip 222. The left and right ends of the conveyor belt 212 are fixedly connected with the isolation baffle 221. Two sets of isolation baffles 221 close to each other are transmission-connected. The outer end of the conveyor belt 212 is fixedly connected with a plurality of sets of electromagnetic strips 222. The front and rear ends of the electromagnetic strips 222 are connected to the magnetic self-switch component 23.

[0044] The magnetic self-switch assembly 23 includes an energized contact 231 and an energized contact plate 232. The front and rear ends of the electromagnetic strip 222 are fixedly connected with the energized contact 231. The left and right inner walls of the support box 1 are fixedly connected with the energized contact plate 232. The energized contact plate 232 is in contact and sliding connection with the energized contact 231 on one end of the conveyor belt 212 that is close to each other.

[0045] The self-sorting discharging assembly 24 includes an oblique 7-shaped guide plate 241, a discharging port 242 and a conveying mechanism 243. The inner wall of the supporting box 1 below the conveyor belt 212 is fixedly connected with an oblique 7-shaped guide plate 241. The supporting box 1 on the side away from each other of the two sets of oblique 7-shaped guide plates 241 is provided with a discharging port 242. The conveying mechanism 243 is provided below the conveyor belt 212.

[0046] When the raw material is crushed by the adjustable crushing and screening component 3 and falls between the two groups of conveyor belts 212, the first motor 211 is started at this time, and the first motor 211 drives the two groups of conveyor belts 212 to move through the discharge pipe 313 at the same time. At this time, the electromagnetic strip 222 is energized by dismantling the door panel 323 and the energized contact 231, so that the electromagnetic strip 222 on one side of the two groups of conveyor belts 212 close to each other generates magnetic force and adsorbs the material between the two groups of conveyor belts 212, so that the iron impurities in the material are adsorbed onto the conveyor belt 212, thereby realizing the screening of the iron impurities in the material, and because the adsorption is carried out simultaneously on the front and back sides of the material, it is avoided that the impurities cannot be adsorbed or are connected due to the obstruction of other impurities. In the case of impurities being adsorbed together, when the impurities are transported to the side of the conveyor belt 212 away from each other, the electromagnetic strip 222 that adsorbs the impurities drives the energized contact 231 to move away from the energized contact plate 232, thereby disconnecting the electromagnetic strip 222 from the power supply, and further preventing the electromagnetic strip 222 from continuing to adsorb impurities. At this time, the impurities fall from the side of the conveyor belt 212 away from each other to the side of the inclined 7-shaped guide plates 241 away from each other and are discharged through the adjusting turntable 342. The screened material falls between the two groups of inclined 7-shaped guide plates 241 and falls onto the conveying mechanism 243 under the guiding action of the inclined 7-shaped guide plates 241, and is then transported away by the conveying mechanism 243, thereby realizing the automatic adsorption and screening and automatic desorption and classification of iron impurities.

[0047] The adjustable crushing and screening assembly 3 comprises a mounting mechanism 31, a screen removal assembly 32, a crushing assembly 33 and an adjusting assembly 34. The mounting mechanism 31 is connected to the top plate of the supporting box 1, the screen removal assembly 32 is connected to the middle of the mounting mechanism 31, the crushing assembly 33 is connected to the mounting mechanism 31 at the upper end of the screen removal assembly 32, the crushing assembly 33 is connected to the adjusting assembly 34, and the left end of the adjusting assembly 34 is connected to the left side wall of the mounting mechanism 31;

[0048] The mounting mechanism 31 includes a mounting box 311, a feed pipe 312 and a discharge pipe 313. The feed pipe 312 is fixedly connected to the top plate of the mounting box 311, and the discharge pipe 313 is fixedly connected to the bottom plate of the mounting box 311. The discharge pipe 313 passes through the top plate of the supporting box 1 and is fixedly connected to the supporting box 1. The lower end of the discharge pipe 313 is located between the upper ends of the two groups of conveyor belts 212.

[0049] The screen disassembly assembly 32 includes a support block 321, a sliding screen 322, a replacement door panel 323 and an insertion rod 324. The front and rear inner walls of the installation box 311 are fixedly connected with support blocks 321. The front and rear ends of the upper end of the sliding screen 322 are slidably connected to a group of support blocks 321 respectively. An opening is provided on the left side wall of the installation box 311. A replacement door panel 323 is clamped in the opening of the left side wall of the installation box 311. The insertion rod 324 passes through the replacement door panel 323 and the left side wall of the installation box 311 and is slidably connected to the replacement door panel 323 and the installation box 311.

[0050] The crushing assembly 33 includes a second motor 331, a driving rotary disk 332, a rotating shaft 333, a straight slide groove 334 and a support rod 335. The second motor 331 is fixedly connected to the right side wall of the installation box 311, and the output end of the second motor 331 is fixedly connected to the rotating shaft 333, and the rotating shaft 333 passes through three groups of driving rotary disks 332, and the rightmost group of driving rotary disks 332 is fixedly connected to the rotating shaft 333. The driving rotary disks 332 are each provided with a plurality of groups of straight slide grooves 334 around the center, and the straight slide grooves 334 on the three groups of driving rotary disks 332 correspond to each other. In each group of straight slide grooves 334 on the same driving rotary disk 332, a group of support rods 335 passes through the straight slide grooves 334 and is slidably connected to the straight slide grooves 334, and each group of support rods 335 passes through the straight slide grooves 334 on three different groups of driving rotary disks 332, and the support rods 335 are rotatably connected to a plurality of groups of crushing knives 336;

[0051] The adjustment assembly 34 includes a rotating drum 341, an adjustment rotating disk 342, an adjustment inclined slide slot 343, an adjustment notch 344 and an adjustment rotating block 345. The left end of the rotating shaft 333 is rotatably connected to the rotating drum 341. The right end of the rotating drum 341 passes through the two groups of driving rotating disks 332 on the left and is rotatably connected to the two groups of driving rotating disks 332 on the left. The rotating drum 341 on the left side of the leftmost driving rotating disk 332 and the rotating drum 341 on the left side of the rightmost driving rotating disk 332 are fixedly connected. A group of adjusting dials 342 are connected, and a plurality of groups of adjusting inclined slots 343 are opened around the center of the adjusting dials 342. The corresponding adjusting inclined slots 343 on the two groups of adjusting dials 342 are penetrated by the same group of supporting rods 335 and are slidably connected with the supporting rods 335. An adjusting notch 344 is opened at the left end of the rotating shaft 333, and the right end of the adjusting rotating block 345 is inserted into the adjusting notch 344. The left end of the adjusting rotating block 345 is clamped with the left end of the rotating cylinder 341.

[0052] The adjusting notch 344 is a square slot, the right end of the adjusting rotating block 345 is a square plug, a plurality of groups of clamping blocks are fixedly connected to the outer wall of the left end of the adjusting rotating block 345, a plurality of groups of clamping slots are opened on the inner wall of the left end of the rotating cylinder 341, and the adjusting rotating block 345 is clamped with the rotating cylinder 341 through the clamping blocks and the clamping slots;

[0053] The material is sent into the installation box 311 through the feed pipe 312, and the second motor 331 is started at this time. The second motor 331 drives the rightmost driving turntable 332 to rotate through the rotating shaft 333. The rotating shaft 333 drives the rotating drum 341 to rotate through the adjusting rotating block 345 at the same time, and the rotating drum 341 drives the adjusting turntable 342 to rotate, so that the adjusting turntable 342 and the driving turntable 332 rotate at the same time, and the driving turntable 332 drives the supporting rod 335 to rotate, and the supporting rod 335 drives the crushing knife 336 to rotate around the rotating shaft 333 and crush the material. The crushed material falls on the sliding screen 322 and is screened by the sliding screen 322. When the material needs to be crushed into different sizes, the adjusting turntable 345 is pulled outward. When the left side of the adjusting turntable 345 is separated from the rotating drum 341, the rotating drum The cam 341 is in the process of being moved along the axis of rotation 333 and the adjusting block 345 is in the process of being moved along the axis of rotation 333. The cam 341 is in the process of being moved along the axis of rotation 333 and the adjusting block 345 is in the process of being moved along the axis of rotation 333.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screening device for a crushing material production line for automatically screening impurities in waste plastics, comprising a supporting box (1), characterized in that: The upper end of the support box (1) is connected to an adjustable crushing and screening assembly (3) for crushing raw materials into various sizes; A magnetic impurity screening component (2) for electromagnetically screening the raw materials crushed by the adjustable crushing and screening component (3) is connected to the supporting box (1) below the adjustable crushing and screening component (3); The magnetic impurity screening component (2) comprises a driving component (21), a self-isolating magnetic component (22), a magnetic self-switching component (23) and a self-classifying discharging component (24); the left and right side walls of the supporting box (1) are connected with the driving component (21) for driving the self-isolating magnetic component (22); the middle part of the driving component (21) is connected with the self-isolating magnetic component (22) for adsorbing and screening iron impurities in the raw material; the left and right ends of the self-isolating magnetic component (22) are connected with the magnetic self-switching components (23) for automatically switching the self-isolating magnetic component (22) on and off; and the supporting box (1) below the self-isolating magnetic component (22) is connected with the self-classifying discharging component (24) for classifying and sending out materials screened by the self-isolating magnetic component (22); The adjustable crushing and screening assembly (3) comprises a mounting mechanism (31), a screen removal assembly (32), a crushing assembly (33) and an adjusting assembly (34); the mounting mechanism (31) is connected to the top plate of the supporting box (1); the screen removal assembly (32) is connected to the middle of the mounting mechanism (31); the crushing assembly (33) is connected to the mounting mechanism (31) at the upper end of the screen removal assembly (32); the crushing assembly (33) is connected to the adjusting assembly (34); and the left end of the adjusting assembly (34) is connected to the left side wall of the mounting mechanism (31); The mounting mechanism (31) comprises a mounting box (311), a feed pipe (312) and a discharge pipe (313); the feed pipe (312) is fixedly connected to the top plate of the mounting box (311); the discharge pipe (313) is fixedly connected to the bottom plate of the mounting box (311); the discharge pipe (313) passes through the top plate of the supporting box (1) and is fixedly connected to the supporting box (1); the lower end of the discharge pipe (313) is located between the upper ends of the two groups of conveyor belts (212); The crushing assembly (33) comprises a second motor (331), a driving rotary disk (332), a rotating shaft (333), a straight slide groove (334) and a support rod (335). The second motor (331) is fixedly connected to the right side wall of the installation box (311). The output end of the second motor (331) is fixedly connected to the rotating shaft (333). The rotating shaft (333) passes through three groups of driving rotary disks (332). The rightmost group of driving rotary disks (332) is fixedly connected to the rotating shaft (333). 2) a plurality of groups of straight slide grooves (334) are provided around the center, the straight slide grooves (334) on the three groups of driving turntables (332) correspond to each other, each group of straight slide grooves (334) on the same driving turntable (332) has a group of support rods (335) passing through the straight slide grooves (334) and slidably connected to the straight slide grooves (334), each group of support rods (335) passes through the straight slide grooves (334) on three different groups of driving turntables (332), and the support rods (335) are rotatably connected to a plurality of groups of crushing knives (336); The adjustment assembly (34) comprises a rotating drum (341), an adjustment rotating disk (342), an adjustment inclined sliding groove (343), an adjustment notch (344) and an adjustment rotating block (345); the left end of the rotating shaft (333) is rotatably connected in the rotating drum (341); the right end of the rotating drum (341) passes through the two groups of driving rotating disks (332) on the left side and is rotatably connected to the two groups of driving rotating disks (332) on the left side; a group of adjusting rotating disks (342) are fixedly connected to the rotating drum (341) on the left side of the leftmost driving rotating disk (332) and the rotating drum (341) on the left side of the rightmost driving rotating disk (332); a plurality of groups of adjusting inclined sliding grooves (343) are provided around the center of the adjusting rotating disk (342); the two groups of adjusting rotating disks (342) are ) are all penetrated by the same group of support rods (335) and are slidably connected to the support rods (335); an adjustment notch (344) is provided at the left end of the rotating shaft (333); the right end of the adjustment rotating block (345) is inserted into the adjustment notch (344); the left end of the adjustment rotating block (345) is clamped with the left end of the rotating cylinder (341); the adjustment notch (344) is a square groove; the right end of the adjustment rotating block (345) is a square plug; a plurality of groups of clamping blocks are fixedly connected to the outer wall of the left end of the adjustment rotating block (345); a plurality of groups of clamping grooves are provided on the inner wall of the left end of the rotating cylinder (341); the adjustment rotating block (345) is clamped with the rotating cylinder (341) via the clamping blocks and the clamping grooves.

2. The screening device for crushing material production line for automatic screening of waste plastic impurities according to claim 1 is characterized in that: The driving assembly (21) comprises a first motor (211), a conveyor belt (212) and a gear set (213); the upper end of the right side wall of the supporting box (1) is fixedly connected to the first motor (211); the front and rear ends between the left and right inner walls of the supporting box (1) are rotatably connected to the conveyor belt (212); the output end of the first motor (211) is fixedly connected to the roller of one group of conveyor belts (212); and the rollers at the same height on the left sides of the two groups of conveyor belts (212) are transmission-connected via the gear set (213).

3. The screening device for crushing material production line for automatic screening of waste plastic impurities according to claim 2 is characterized in that: The self-isolating magnetic attraction component (22) comprises an isolation baffle (221) and an electromagnetic strip (222); the left and right ends of the conveyor belt (212) are both fixedly connected to the isolation baffle (221); two groups of isolation baffles (221) close to each other are transmission-connected; the outer end of the conveyor belt (212) is fixedly connected to a plurality of groups of electromagnetic strips (222); and the front and rear ends of the electromagnetic strips (222) are connected to the magnetic self-switch component (23).

4. The screening device for crushing material production line for automatic screening of impurities in waste plastics according to claim 3 is characterized in that: The magnetic self-switch assembly (23) comprises an energized contact (231) and an energized contact plate (232); the front and rear ends of the electromagnetic strip (222) are fixedly connected to the energized contact (231); the left and right inner walls of the support box (1) are fixedly connected to the energized contact plate (232); the energized contact plate (232) and the conveyor belt (212) are in contact and sliding connection with the energized contact (231) on one end close to each other.

5. The screening device for crushing material production line for automatic screening of impurities in waste plastics according to claim 4 is characterized in that: The self-sorting discharge assembly (24) comprises an oblique 7-shaped guide plate (241), a discharge port (242) and a conveying mechanism (243); the oblique 7-shaped guide plates (241) are fixedly connected to the inner wall of the support box (1) below the conveyor belt (212); the discharge port (242) is provided on the support box (1) on the side away from each other of the two groups of oblique 7-shaped guide plates (241); and the conveying mechanism (243) is provided below the conveyor belt (212).

6. The screening device for crushing material production line for automatically screening impurities in waste plastics according to claim 5 is characterized in that: The screen disassembly assembly (32) comprises a support block (321), a sliding screen (322), a removable door panel (323) and an insertion rod (324); the front and rear inner walls of the installation box (311) are fixedly connected to the support blocks (321); the front and rear ends of the upper end of the sliding screen (322) are respectively slidably connected to a group of support blocks (321); an opening is provided on the left side wall of the installation box (311); the removable door panel (323) is clamped in the opening of the left side wall of the installation box (311); and the insertion rod (324) passes through the removable door panel (323) and the left side wall of the installation box (311) and is slidably connected to the removable door panel (323) and the installation box (311).

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