Plastic particle screening machine

Abstract

The invention discloses a plastic particle screening machine, and relates to the technical field of screening machines, the plastic particle screening machine comprises a working frame, the bottom end of the working frame is fixedly connected with a supporting seat, and a screening cylinder is driven to rotate through a servo motor and a worm and gear, so that the screening cylinder throws plastic particles located in a filter sieve to the inner wall of the screening cylinder; the plastic particles with the sizes smaller than those of the holes in the plastic particles enter the next-stage filter sieve, so that the plastic particles can be sieved step by step, the problem that part of the plastic particles with the sizes smaller than those of the plastic particles with the sizes larger than those of the plastic particles without being sieved is solved, the sieving precision can be effectively improved, and the sieving efficiency is improved. The screening machine is simple in structure and large in screening area, the screening efficiency can be effectively improved, meanwhile, the screening stage number can be automatically adjusted by rotating the filtering baffle, the grading screening precision can be adjusted according to the screening requirement, various screening requirements can be met, and the applicability of the screening machine can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of screening machines, in particular to a plastic particle screening machine. Background Art

[0002] Plastic particle screening machine is a kind of plastic sorting equipment, which is widely used in plastic recycling, reuse and plastic processing industries; At present, the vibrating screens commonly used in screening machines on the market usually include linear vibrating screens and rotary vibrating screens. When the screening machine uses the linear vibrating screen to screen plastic particles, although it has the advantages of large screen surface, strong amplitude, high screening efficiency, and large processing capacity per unit hour, when there are more materials in the screen of the linear vibrating screen, it is easy for some smaller plastic particles to be discharged together with larger plastic particles without being screened, thereby reducing the screening accuracy, and accumulation will occur in a certain area, resulting in uneven screening problems. At the same time, its amplitude adjustment is more difficult. When the screening machine uses the rotary vibrating screen to screen plastic particles, although it has the advantages of the screen surface not being easily blocked, the screening efficiency is relatively low. Therefore, the vibrating screen commonly used by the existing screening machine cannot effectively and accurately screen plastic particles of different sizes when screening plastic particles, resulting in low precision of the screened plastic particles, and it is impossible to quickly adjust the screening accuracy level according to the screening requirements, so it is difficult to meet the requirements of existing plastic particle screening and processing. Summary of the invention

[0003] In view of this, and in response to the shortcomings of the prior art, the present invention provides a plastic particle screening machine to solve the problem that the vibrating screen of the screening machine in the prior art cannot guarantee a high screening efficiency and cannot adjust the screening accuracy level according to the screening requirements.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a plastic particle screening machine, characterized in that: it comprises a working frame, the bottom end of the working frame is fixedly connected to a support seat, the inner surface of the top of the support seat is rotatably connected to a screening cylinder, the upper part of the working frame is fixedly connected to a feeding box, the feeding box is located directly above the screening cylinder, one side of the feeding box is fixedly connected to a feeding hopper through an opening, a plurality of discharge pipes are fixedly connected to the outer wall of the bottom of the screening cylinder at equal intervals, and the bottom ends of the plurality of discharge pipes are hinged with sealing covers; The feeding box is provided with a dust removal mechanism inside, the screening cylinder is provided with a multi-stage screening mechanism inside, and the working frame is provided with an anti-blocking mechanism; The multi-stage screening mechanism includes a servo motor, which is fixedly connected to one side of the bottom end wall of the working frame, and the output shaft of the servo motor is fixedly connected to a worm, and the worm is rotatably connected to the inside of the support seat, and a worm wheel is fixedly connected to the center of the outer wall of the bottom of the screening cylinder, and the worm is meshed with the worm wheel. A plurality of filter screens are equidistantly fixedly connected to the bottom of the inner cavity of the screening cylinder, and each of the feed pipes is located directly below the space between every two filter screens. The outer surfaces of the plurality of filter screens are rotatably connected to filter baffles, and the top of the filter baffle is fixedly connected to a convex plate, and a counterweight is threadedly connected to the convex plate, and a telescopic spring is fixedly connected between the lower part of the inner surface of the plurality of filter screens and the lower part of the outer surface of the filter baffle, and the telescopic spring is located inside the filter screen.

[0005] Preferably, the plurality of filter screens are all cylindrical structures as a whole, the inner diameters of the plurality of filter screens increase step by step, and the diameters of the holes opened on the plurality of filter screens decrease step by step from the inside to the outside.

[0006] Preferably, the holes on the filter baffle are all of the same size as the holes on the filter screens, and the gaps between the holes on the filter baffle are all matched with the holes on the filter screens.

[0007] Preferably, the plurality of feed pipes are located directly below the spaces between the plurality of filter screens.

[0008] Preferably, the dust removal mechanism includes a transmission rod, which is symmetrically rotatably connected to the feeding box, and the number of the transmission rods is not less than two. The outer surfaces of the two transmission rods are fixedly connected to brush rollers, and the brushes between the brush rollers are staggered. One end of the two transmission rods is fixedly connected to gears, the gears are meshed with each other, and the gears are located outside the feeding box.

[0009] Preferably, one of the transmission rods and the worm gear is fixedly connected with a synchronous wheel respectively, and the synchronous wheels are connected through a synchronous belt transmission.

[0010] Preferably, an exhaust duct is fixedly connected to the top of the loading box, an air outlet duct is fixedly connected to the side of the exhaust duct away from the loading box, a filter plate is fixedly connected between the inside of the air outlet duct and an outer wall of one side of the exhaust duct, and a storage box is fixedly connected to the bottom end of the exhaust duct away from the loading box.

[0011] Preferably, the anti-blocking mechanism includes a fixed baffle, which is fixedly connected between opposite vertical surfaces of the working frame, a connecting plate is slidably connected to the middle of the fixed baffle, and a plurality of cleaning strips are equidistantly fixedly connected to one side of the connecting plate close to the bottom of the screening cylinder, and the plurality of cleaning strips are respectively located in the space between every two filter screens, and a plurality of protrusions are equidistantly fixedly connected to one side of each cleaning strip away from the fixed baffle.

[0012] Preferably, a stop block is fixedly connected to a side of the connecting plate away from the cleaning strip, a return spring is fixedly connected between the stop block and the fixed baffle, and the return spring is sleeved on the outer surface of the connecting plate.

[0013] Preferably, a trigger plate is fixedly connected to one side of the bottom of the connecting plate, and an extrusion block is fixedly connected to one side of the top of the screening cylinder. Both the extrusion block and the trigger plate are arc-shaped triangles, and the outer surface of the trigger plate is matched with the inner surface of the extrusion block.

[0014] Compared with the prior art, the present invention provides a plastic particle screening machine, which has the following beneficial effects: The servo motor drives the worm to rotate, and the worm gear meshes with each other, so that the screening cylinder throws the plastic particles in the filter screen onto its inner wall during rotation, causing the plastic particles smaller than the holes on the filter screen to enter the next filter screen, thereby allowing the plastic particles to be screened step by step, avoiding the problem of some smaller plastic particles being discharged along with larger plastic particles before being screened, thereby effectively improving the screening accuracy. At the same time, the screening area of ​​the cylindrical filter screen is large, thereby effectively improving the screening efficiency. At the same time, the filter baffle is rotated to achieve autonomous adjustment of the screening level, thereby adjusting the accuracy of the plastic particle classification screening according to the screening requirements, thereby meeting a variety of screening requirements, thereby effectively improving the applicability of the screening machine.

[0015] The transmission rod is driven to rotate by the synchronous wheel and the synchronous belt, and the two gears mesh with each other, so that the two brush rollers rotate relative to each other and sweep off the dust attached to the plastic particles, and the dust in the loading box is sucked away by the fan through the air outlet pipe and the exhaust pipe. At the same time, the filter plate arranged between the air outlet pipe and the exhaust pipe will block the dust and then fall into the storage box for centralized collection, thereby avoiding the problem that the existing screening machine has the sealing property to prevent the dust from floating into the working environment, but cannot prevent the dust from being adsorbed inside the screening machine and affecting the original performance of the various components of the screening machine, thereby reducing the wear and erosion of the internal components of the screening machine by the dust, thereby effectively extending the service life of the screening machine, while keeping the screening machine clean and collecting dust in a centralized manner, which can reduce the frequency of repair and replacement of parts and reduce the workload of workers, thereby reducing maintenance and labor costs.

[0016] The rotation of the screening drum drives the extrusion block thereon to rotate synchronously, and the rotating extrusion block is used to intermittently squeeze the trigger plate on the connecting plate, so that the multiple cleaning strips on the connecting plate slide along the fixed baffle toward the inside of the screening drum, and under the elastic action of the reset spring, the protrusions on the multiple cleaning strips can regularly clean the plastic particles stuck on the filter screen and the filter baffle, thereby avoiding the problem of plastic particles stuck in the holes on the filter screen and the filter baffle causing the filter screen to be blocked, thereby improving the screening efficiency of the filter screen, and regularly cleaning the plastic particles stuck on the filter screen during the operation of the screening drum can effectively reduce the probability of failure of the screening machine, thereby ensuring the stable operation of the screening machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 It is a schematic diagram of the cross-section structure of the filter screen and the filter baffle in the present invention; Figure 4 It is a schematic diagram of the structure inside the screening cylinder of the present invention; Figure 5 It is a structural schematic diagram of the bottom of the support base in the present invention; Figure 6 It is a structural exploded diagram of the multi-stage screening mechanism in the present invention; Figure 7 It is a schematic diagram of the cross-section structure of the filter screen and the filter baffle in the present invention, which is converted from a front view to a side view; Figure 8 It is a structural schematic diagram of the state where the filter baffle covers the filter screen in the present invention; Fig. 9 It is a schematic diagram of the cross-section structure of the air exhaust pipe and the air outlet pipe in the present invention; Fig.10 It is a schematic diagram of the cross-section structure of the loading box in the present invention; Fig.11 It is a structural explosion diagram of the dust removal mechanism in the present invention; Fig.12 It is an enlarged structural diagram of the anti-blocking mechanism in the present invention; Fig.13 It is a structural enlarged diagram of the state of the extrusion block extruding the trigger plate in the present invention; Fig.14 It is a structural explosion diagram of the anti-blocking mechanism in the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Working frame; 101. Support seat; 102. Screening cylinder; 103. Loading box; 104. Loading hopper; 105. Discharging pipe; 106. Sealing cover; Dust removal mechanism: 2, transmission rod; 201, brush roller; 202, gear; 203, synchronous wheel; 204, synchronous belt; 205, exhaust pipe; 206, air outlet pipe; 207, filter plate; 208, storage box; Multi-stage screening mechanism: 3, servo motor; 301, worm; 302, worm wheel; 303, filter screen; 304, filter baffle; 305, convex plate; 306, counterweight; 307, telescopic spring; Anti-blocking mechanism: 4, fixed baffle; 401, connecting plate; 402, cleaning strip; 403, convex block; 404, stop block; 405, return spring; 406, trigger plate; 407, extrusion block. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0020] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0021] Example 1: Please refer to Figures 9 to 11As shown, in order to solve the problems mentioned in the technical solution, the embodiment of the present application provides a plastic particle screening machine, including a working frame 1, the bottom end of the working frame 1 is fixedly connected to a support seat 101, and the bottom of the support seat 101 is in a hollow state to facilitate subsequent unloading work. A screening cylinder 102 is rotatably connected to the inner surface of the top of the support seat 101, and a loading box 103 is fixedly connected to the upper part of the working frame 1, and the loading box 103 is located directly above the screening cylinder 102. A loading hopper 104 is fixedly connected to one side of the loading box 103 through an opening, wherein two inclined plates are symmetrically arranged inside the loading box 103, and the highest point of the two inclined plates is located at the lowest point of the loading hopper 104, which is used to guide the plastic particles to the middle position of the loading box 103. A plurality of unloading pipes 105 are fixedly connected to the outer wall of the bottom of the screening cylinder 102 in an annular manner at equal intervals, and the plurality of unloading pipes 105 are connected to the inside of the screening cylinder 102, and the bottom ends of the plurality of unloading pipes 105 are hinged with sealing covers 106. A multi-stage screening mechanism is arranged inside the screening cylinder 102, a dust removal mechanism is arranged inside the feeding box 103, an anti-blocking mechanism is arranged on the working frame 1, and the dust removal mechanism includes a transmission rod 2, which is symmetrically rotated and connected to the feeding box 103, and the number of the transmission rods 2 is not less than two, and the two transmission rods 2 are staggered and distributed on the feeding box 103, and the outer surfaces of the two transmission rods 2 are fixedly connected to brush rollers 201, and the brushes between the brush rollers 201 are staggered to ensure that the brushes can clean the plastic particles to be screened that fall from the gap between the two brush rollers 201. Gears 202 are fixedly connected at one end of the two transmission rods 2, and the gears 202 are meshed with each other. The gears 202 are located outside the feeding box 103, and are used to enable the two brush rollers 201 to rotate toward each other, thereby increasing the cleaning area for removing dust attached to the plastic particles. A synchronous wheel 203 is fixedly connected to one of the transmission rods 2 and the worm 301, and the synchronous wheel 203 on one of the transmission rods 2 is located on the side away from the gear 202, and the synchronous wheels 203 are connected through a synchronous belt 204. An exhaust pipe 205 is fixedly connected to the top of the loading box 103, and an outlet pipe 206 is fixedly connected to the side of the exhaust pipe 205 away from the loading box 103. A filter plate 207 is fixedly connected between the inside of the outlet pipe 206 and the outer wall of one side of the exhaust pipe 205, and a storage box 208 is fixedly connected to the bottom end of the exhaust pipe 205 away from the loading box 103.

[0022] Working process: When in use, the worker first pours the plastic particles to be screened from the upper hopper 104 into the upper box 103, and then the plastic particles entering the upper box 103 fall onto the two inclined plates symmetrically arranged inside it, and slide downward along its inclined surface. At the same time, the synchronous belt 204 is driven to rotate by the synchronous wheel 203 on the multi-stage screening mechanism, and the synchronous belt 204 drives another synchronous wheel 203 to rotate, thereby causing the transmission rod 2 fixedly connected thereto to rotate synchronously, and the two mutually meshing gears 20 2, the brush rollers 201 on the two transmission rods 2 rotate downward relatively, and then the plastic particles fall between the two brush rollers 201 under the guidance of the two inclined plates. The two brush rollers 201 use the brushes thereon to sweep away the dust attached to the plastic particles while conveying the plastic particles downward. In this process, the fan draws air from the opening of the upper hopper 104 of the upper material box 103, so that the adsorbed air circulates through the exhaust pipe 205 and is discharged from the outlet pipe 206. The air is exhausted through the exhaust pipe 206. When the air is discharged from the air outlet 206, the dust and impurities in the air are blocked by the filter plate 207, thereby preventing the dust from being directly discharged into the external environment. When the screening is completed and the fan is turned off, the dust adsorbed on the filter plate 207 by the wind falls downward due to the loss of the suction force of the fan, and then falls into the storage box 208 at the bottom of the exhaust pipe 205. Thus, the dust swept from the surface of the plastic particles can be collected in a centralized manner, avoiding the problem that the existing screening machine has sealing properties to prevent dust from floating into the working environment, but cannot prevent dust from being adsorbed inside the screening machine and affecting the original performance of various components of the screening machine. In addition, the wear and erosion of various components inside the screening machine by dust can be reduced, thereby effectively extending the service life of the screening machine. At the same time, keeping the screening machine clean and collecting dust in a centralized manner can reduce the frequency of repair and replacement of parts and reduce the workload of workers, thereby reducing maintenance and labor costs.

[0023] Example 2: Please refer to Figures 1 to 8As shown, the multi-stage screening mechanism includes a servo motor 3, which is fixedly connected to one side of the bottom end wall of the working frame 1, and the servo motor 3 is located outside the support seat 101. The output shaft of the servo motor 3 is fixedly connected to a worm 301, and the synchronous wheel 203 on the worm 301 is located at an end away from the servo motor 3. The worm 301 is rotatably connected to the inside of the support seat 101, and a worm wheel 302 is fixedly connected to the center of the bottom outer wall of the screening cylinder 102. The worm 301 is meshed with the worm wheel 302. A plurality of filter screens 303 are fixedly connected to the bottom of the inner cavity of the screening cylinder 102 at equal intervals, and each feed pipe 105 is located directly below the space between every two filter screens 303. The outer surfaces of the multiple filter screens 303 are all rotatably connected with filter baffles 304, and the filter baffles 304 are sleeved on the outer surface of the filter screen 303. The top of the filter baffle 304 is fixedly connected with a convex plate 305, and the convex plate 305 is threadedly connected with a counterweight block 306. A telescopic spring 307 is fixedly connected between the lower part of the inner surface of the multiple filter screens 303 and the lower part of the outer surface of the filter baffle 304. The telescopic spring 307 is located inside the filter screen 303, and the telescopic spring 307 is squeezed by the inner wall of the lower part of the filter screen 303 and is in an arc shape as a whole. Therefore, the telescopic spring 307 can be stretched and contracted along the lower part of the filter screen 303. The multiple filter screens 303 are all cylindrical structures as a whole. The inner diameter values ​​of the multiple filter screens 303 increase step by step from the inside to the outside, and the diameter values ​​of the holes opened on the multiple filter screens 303 decrease step by step from the inside to the outside. The holes formed on the filter baffle 304 are of the same size as the holes formed on the corresponding filter screens 303 , and the gaps between the holes on the filter baffle 304 are adapted to the holes formed on the plurality of filter screens 303 .

[0024] Working process: the plastic particles cleaned by the two brush rollers 201 continue to fall, and fall from the inside of the feeding box 103 to the inside of the screening drum 102, and then the plastic particles all fall into the inside of the filter screen 303 located at the center of the screening drum 102. At this time, the servo motor 3 is started to drive the worm 301 to rotate synchronously, and then the worm 301 drives the worm gear 302 meshing with it to rotate synchronously, thereby driving the screening drum 102 to rotate at a uniform speed along the inner surface of the support seat 101, so that the plastic particles in the filter screen 303 located at the center rotate synchronously. At the same time, the filter baffle 304 increases the friction between the two due to the downward pressure of the weight block 306 on it, thereby causing the telescopic spring 307 between the filter baffle 304 and the filter screen 303 to be gradually contracted by the common weight of the counterweight block 306 and the filter baffle 304, so that the holes on the filter baffle 304 gradually approach the holes on the filter screen 303, and then the circles of the holes on the two are The centers of the two filters are aligned, so that the plastic particles are thrown onto the screen of the innermost filter screen 303 by the rotation of the screening cylinder 102, and then the plastic particles of the same size are thrown out of the inner filter screen 303 through the holes on the filter screen 303, and are located between the innermost filter screen 303 and the filter screen 303 of the adjacent layer outside it, while the plastic particles whose size is larger than the diameter of the holes on the innermost filter screen 303 are blocked inside the innermost filter screen 303. Similarly, the plastic particles entering between the second filter screen 303 and the innermost filter screen 303 are also thrown onto the screen of the second filter screen 303, and are thrown into the next filter screen 303 through the holes thereon, thereby the plastic particles can be screened step by step, avoiding the problem that some smaller plastic particles are discharged together with larger plastic particles before being screened, thereby effectively improving the screening accuracy. At the same time, the screening area of ​​the cylindrical filter screen 303 is large, thereby effectively improving the screening efficiency.

[0025] When the screening is completed, the speed of the servo motor 3 is gradually reduced. At this time, the torque of the filter screen 303 is also gradually reduced, so that the telescopic spring 307 gradually returns to its original state due to the reduction of the torque of the filter screen 303. In this process, the telescopic spring 307 gradually pushes the filter baffle 304 to rotate in the opposite direction along the inside of the filter screen 303, so that the holes on the filter screen 303 and the holes on the filter baffle 304 gradually move away from each other, causing the plastic particles attached to the inner surfaces of the multiple filter screens 303 to slide off from their inner surfaces, and then the filter baffle 304 can prevent the screened plastic particles from sliding off the inner surface of the filter screen 303 and returning to the inside of the upper filter screen 303 from the holes of the upper filter screen 303, causing the plastic particles to be in chaos. At the same time, the worker can rotate the filter baffle 304 to cover the filter screen 303, thereby realizing the autonomous adjustment of the screening level, and then the accuracy of the plastic particle classification screening can be adjusted according to the screening requirements, so as to meet a variety of screening requirements, thereby effectively improving the applicability of the screening machine. Then the workers manually open the sealing cover 106 at the bottom of the discharge pipe 105 in turn, discharge the plastic particles screened between the multiple filter screens 303 in turn, and store them separately, thereby completing the screening of the plastic particles.

[0026] Example 3: Please refer to Figure 12 to Figure 14 As shown, the anti-blocking mechanism includes a fixed baffle 4, which is fixedly connected between the opposite vertical surfaces of the working frame 1, and a connecting plate 401 is slidably connected to the middle of the fixed baffle 4. A plurality of cleaning strips 402 are fixedly connected to the bottom side of the connecting plate 401 close to the screening cylinder 102 at equal intervals, and the plurality of cleaning strips 402 are respectively located in the space between every two filter screens 303, and a plurality of protrusions 403 are fixedly connected to the side of each cleaning strip 402 away from the fixed baffle 4 at equal intervals. A stop block 404 is fixedly connected to the side of the connecting plate 401 away from the cleaning strip 402, and a reset spring 405 is fixedly connected between the stop block 404 and the fixed baffle 4, and the reset spring 405 is sleeved on the outer surface of the connecting plate 401. A trigger plate 406 is fixedly connected to one side of the bottom of the connecting plate 401, and an extrusion block 407 is fixedly connected to one side of the top of the screening cylinder 102. The extrusion block 407 and the trigger plate 406 are both arc-shaped triangles, and the outer surface of the trigger plate 406 is adapted to the inner surface of the extrusion block 407, wherein the trigger plate 406 is located on the movement trajectory of the extrusion block 407, the trigger plate 406 does not contact the top of the screening cylinder 102, and the top of the extrusion block 407 does not contact the bottom of the connecting plate 401, thereby ensuring that the connecting plate 401 and the trigger plate 406 will not hinder the rotation of the screening cylinder 102.

[0027] Working process: When screening plastic particles, the screening cylinder 102 rotates continuously during this process, and the screening cylinder 102 drives the extrusion block 407 thereon to rotate synchronously. When the extrusion block 407 contacts the trigger plate 406 on the connecting plate 401, the inner surface of the extrusion block 407 continuously squeezes the outer surface of the trigger plate 406, causing the connecting plate 401 to slide along the fixed baffle 4 toward the center of the screening cylinder 102. At this time, the stop block 404 on the connecting plate 401 also moves synchronously, and the stop block 404 and the fixed baffle 4 continuously rotate. The return spring 405 located between the two is squeezed to shrink continuously, and the multiple cleaning strips 402 at the bottom of the connecting plate 401 gradually approach the filter screen 303 and the filter baffle 304, and the bumps 403 on the multiple cleaning strips 402 hit the filter screen 303 and the filter baffle 304. The bumps 403 on the filter screen 303 and the filter baffle 304 hit the plastic particles stuck in the holes on the filter screen 303 and the filter baffle 304, and vibrate them off. When the squeezing block 407 is separated from the trigger plate 406 , the trigger plate 406 loses the pressure of the squeezing block 407, so that the reset spring 405 gradually returns to its original state. In this process, the reset spring 405 pushes the stop block 404 to move away from the screening cylinder 102, and the stop block 404 drives the connecting plate 401 to slide along the fixed baffle 4 in the same direction, thereby the multiple cleaning strips 402 located at the bottom of the connecting plate 401 also move, and drive the protrusions 403 thereon to gradually move away from the filter screen 303 and the filter baffle 304, and repeat the cycle, through the intermittent squeezing of the squeezing block 407. Pushing the trigger plate 406 can cause the protrusion 403 on the cleaning bar 402 to periodically hit the filter screen 303 and the filter baffle 304, so that the stuck plastic particles fall off, thereby avoiding the problem of plastic particles being stuck in the holes on the filter screen 303 and the filter baffle 304, thereby improving the screening efficiency of the filter screen 303. At the same time, regularly cleaning the plastic particles stuck on the filter screen 303 during the operation of the screening cylinder 102 can effectively reduce the probability of failure of the screening machine, thereby ensuring the stable operation of the screening machine.

[0028] The above is a detailed introduction to the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A plastic particle screening machine, characterized in that: The invention comprises a working frame (1), wherein the bottom end of the working frame (1) is fixedly connected to a support seat (101), the top inner surface of the support seat (101) is rotatably connected to a screening cylinder (102), the upper part of the working frame (1) is fixedly connected to a loading box (103), the loading box (103) is located directly above the screening cylinder 102, one side of the loading box (103) is fixedly connected to a loading hopper (104) through an opening, and a plurality of discharge pipes (105) are fixedly connected to the outer wall of the bottom of the screening cylinder (102) in an annular manner and at equal intervals, and the bottom ends of the plurality of discharge pipes (105) are hingedly connected to sealing covers (106); A dust removal mechanism is provided inside the feeding box (103), a multi-stage screening mechanism is provided inside the screening cylinder (102), and an anti-blocking mechanism is provided on the working frame (1); The multi-stage screening mechanism comprises a servo motor (3), the servo motor (3) being fixedly connected to one side of the bottom end wall of the working frame (1), the output shaft of the servo motor (3) being fixedly connected to a worm (301), the worm (301) being rotatably connected to the inside of the support seat (101), a worm wheel (302) being fixedly connected to the center of the bottom outer wall of the screening cylinder (102), the worm (301) being meshed with the worm wheel (302), a plurality of filter screens (303) being fixedly connected to the bottom of the inner cavity of the screening cylinder (102) at equal intervals, each of the unloading screens The tubes (105) are respectively located directly below the space between every two filter screens (303); the outer surfaces of the plurality of filter screens (303) are rotatably connected to filter baffles (304); the tops of the filter baffles (304) are fixedly connected to convex plates (305); a counterweight (306) is threadedly connected to the convex plates (305); a telescopic spring (307) is fixedly connected between the lower parts of the inner surfaces of the plurality of filter screens (303) and the lower parts of the outer surfaces of the filter baffles (304); and the telescopic spring (307) is located inside the filter screen (303).

2. A plastic particle screening machine according to claim 1, characterized in that: The plurality of filter screens (303) are all cylindrical structures as a whole, the inner diameter values ​​of the plurality of filter screens (303) are gradually increased, and the diameter values ​​of the holes opened on the plurality of filter screens (303) are gradually decreased from the inside to the outside.

3. A plastic particle screening machine according to claim 2, characterized in that: The holes formed on the filter baffle (304) are all of the same size as the holes formed on the plurality of filter screens (303), and the gaps between the holes on the filter baffle (304) are all compatible with the holes formed on the plurality of filter screens (303).

4. A plastic particle screening machine according to claim 3, characterized in that: The plurality of feed pipes (105) are all located directly below the space between the plurality of filter screens (303).

5. A plastic particle screening machine according to claim 1, characterized in that: The dust removal mechanism comprises a transmission rod (2), the transmission rod (2) being symmetrically rotatably connected to the loading box (103), and the number of the transmission rods (2) is not less than two, the outer surfaces of the two transmission rods (2) are fixedly connected to brush rollers (201), the brushes between the brush rollers (201) are arranged alternately, and one end of the two transmission rods (2) is fixedly connected to a gear (202), the gears (202) are meshed with each other, and the gears (202) are located outside the loading box (103).

6. A plastic particle screening machine according to claim 5, characterized in that: A synchronous wheel (203) is fixedly connected to one of the transmission rods (2) and the worm (301), respectively, and the synchronous wheels (203) are connected to each other via a synchronous belt (204).

7. A plastic particle screening machine according to claim 6, characterized in that: An exhaust pipe (205) is fixedly connected to the top of the loading box (103); an air outlet pipe (206) is fixedly connected to the side of the exhaust pipe (205) away from the loading box (103); a filter plate (207) is fixedly connected between the inside of the air outlet pipe (206) and an outer wall of one side of the exhaust pipe (205); and a storage box (208) is fixedly connected to the bottom end of the exhaust pipe (205) away from the loading box (103).

8. A plastic particle screening machine according to claim 1, characterized in that: The anti-blocking mechanism comprises a fixed baffle (4), the fixed baffle (4) being fixedly connected between opposite vertical surfaces of the working frame (1), a connecting plate (401) being slidably connected to the middle of the fixed baffle (4), a plurality of cleaning strips (402) being fixedly connected at equal distances to a side of the connecting plate (401) close to the bottom of the screening cylinder (102), the plurality of cleaning strips (402) being respectively located in the space between every two filtering screens (303), and a plurality of protrusions (403) being fixedly connected at equal distances to a side of each cleaning strip (402) away from the fixed baffle (4).

9. A plastic particle screening machine according to claim 8, characterized in that: A stopper (404) is fixedly connected to one side of the connecting plate (401) away from the cleaning strip (402), a return spring (405) is fixedly connected between the stopper (404) and the fixed baffle (4), and the return spring (405) is sleeved on the outer surface of the connecting plate (401).

10. A plastic particle screening machine according to claim 9, characterized in that: A trigger plate (406) is fixedly connected to one side of the bottom of the connection plate (401), and an extrusion block (407) is fixedly connected to one side of the top of the screening cylinder (102); the extrusion block (407) and the trigger plate (406) are both in an arc-shaped triangle, and the outer surface of the trigger plate (406) is compatible with the inner surface of the extrusion block (407).

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