Double-layer vibration classification and screening device for plastic particles

Abstract

The utility model provides plastic granule double -deck vibration classification screening device, including the bottom plate, the bottom plate top fixed mounting has the support plate, the both sides of support plate's top all are installed with elastic unit, and the top of two groups of elastic units is connected with the connecting plate, and the elastic unit includes two all is vertical direction and is fixedly installed spring one of support plate top, and the top of spring one is fixed with the bottom of connecting plate. The utility model discloses a special design that mounting frame is inserted to the sieve box and filter board one and filter board two are inserted to the inboard of mounting frame, when needing to dismantle and replace filter board one and filter board two, cancel the positioning between the two contact plates and sieve box of positioning mechanism, personnel can pull mounting frame upwards, and mounting frame is extracted from sieve box, so that filter board one and filter board two can be pulled out from mounting frame to the outside, and filter board one and filter board two are dismantled, and the operation is simple, and the difficulty of dismounting is reduced.

Description

Technical Field

[0001] This utility model relates to the field of plastic granule processing technology, specifically to a double-layer vibration grading and screening device for plastic granules. Background Technology

[0002] In the production of plastic pellets, the pellets after cutting need to be separated into different particle sizes by screening equipment to ensure product uniformity and quality stability. Traditional screening devices generally adopt a vibrating multi-layer filter structure, in which a vibrating motor drives the screen box to generate reciprocating motion, so that the plastic pellets are graded and screened step by step on the multi-layer filter plates.

[0003] Currently, filter plates in this type of screening equipment are mostly fixed inside the screen box using bolts. Specifically, the edges of the filter plate are directly screwed to the side wall of the screen box. When the filter plate needs to be replaced (e.g., due to wear, aperture adjustment, or cleaning), the operator must remove all the fixing screws in sequence to remove the filter plate. This installation method has the following drawbacks:

[0004] 1. Each replacement requires the complete disassembly and reassembly of a large number of screws. This is especially true for vibrating classifiers equipped with double-layer filter plates. Since the upper and lower filter plates are stacked, all the screws of the upper filter plate must be removed and the upper plate removed before the screws of the lower filter plate can be accessed and removed. The operation process is complicated and highly repetitive.

[0005] 2. The narrow internal space of the screen box, especially the lower filter plate area, makes it difficult to operate tools, further reducing the replacement efficiency. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a double-layer vibration grading and screening device for plastic granules, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A double-layer vibrating grading and screening device for plastic granules includes a base plate, a support plate symmetrically fixedly installed on the top of the base plate, elastic units installed on both sides of the top of the support plate, and a connecting plate connected to the top of the two sets of elastic units. Each elastic unit includes two springs that are both vertical and fixedly installed on the top of the support plate, and the top of the springs is fixedly connected to the bottom of the connecting plate. A screen box is welded between the two connecting plates. The top of the screen box is open, and a vibrating motor is fixedly installed at the bottom of the screen box.

[0009] The screen box is equipped with a mounting frame with a cross-section of U-shape. The top of both sides of the mounting frame is integrally formed with contact plates that can fit against the top of the screen box. Filter plate 1 and filter plate 2 are inserted into the inner side of the mounting frame along its open end. Filter plate 1 is located in the middle of the inner side of the mounting frame, and filter plate 2 is located at the bottom of the inner side of the mounting frame. Filter plate 1 has several filter holes 1 on its top, and filter plate 2 has several filter holes 2 on its top. The diameter of filter holes 1 is larger than that of filter holes 2. Discharge port 1, discharge port 2 and discharge port 3 are opened on the side of the screen box near the open end of the mounting frame. The bottom of discharge port 1 is flush with the top of filter plate 1, discharge port 2 is flush with the top of filter plate 2, and discharge port 3 is flush with the bottom wall of the screen box.

[0010] The top of the screen box is equipped with a positioning mechanism that acts on two contact plates. When the two contact plates are in contact with the top of the screen box, the positioning mechanism can position or cancel the positioning between the two contact plates and the screen box. A feeding component for feeding plastic granules is installed on the top of the bottom plate and on the side of the screen box away from the discharge port. The discharge end of the feeding component is located above the opening at the top of the screen box.

[0011] Furthermore: the positioning mechanism includes positioning rods arranged in a rectangular array and rotatably mounted on the top of the screen box. Both contact plates are symmetrically provided with through holes, and the four positioning rods can pass through the four through holes respectively and engage with the contact plates.

[0012] Furthermore: the feeding assembly includes a collection box fixedly installed on the top of the base plate, a conveying cylinder fixedly installed on the top of the collection box, the bottom of the conveying cylinder extending into the collection box and fitting against the bottom wall of the collection box, a feed inlet connected to the inside of the conveying cylinder is opened at the bottom of the outer side wall of the conveying cylinder, a discharge pipe is fixedly installed at the top of the outer side wall of the conveying cylinder and near the screen box, the other end of the discharge pipe extends above the screen box and is flush with the inner wall of the screen box near the conveying cylinder, and the discharge pipe is inclined downward in the direction away from the conveying cylinder, an auger rod is rotatably installed inside the conveying cylinder, the outer side wall of the auger rod is fitting against the inner side wall of the conveying cylinder, and a motor for driving the auger rod to rotate is fixedly installed at the top of the conveying cylinder.

[0013] Furthermore: the positioning rod includes a positioning cylinder rotatably mounted on the top of the screen box, a connecting rod movably passing through the top of the positioning cylinder, a snap-fit ​​rod movably passing through the through hole fixedly mounted on the top of the connecting rod, a second spring sleeved on the outside of the snap-fit ​​rod installed inside the positioning cylinder and between the connecting rod and the positioning cylinder, the top of the contact plate and one side of the through hole are provided with a limiting slot communicating with the through hole, when the second spring is in its natural state, the snap-fit ​​rod can be inserted into the limiting slot and snapped into the contact plate.

[0014] Furthermore, the screen box is inclined downwards along the discharge port.

[0015] Furthermore: The screen box is fixedly installed with guide pipes 1, 2 and 3, which are respectively connected to discharge port 1, discharge port 2 and discharge port 3, and the bottoms of guide pipes 1, 2 and 3 are flush.

[0016] Furthermore, a storage box is placed on the top of the base plate and below the first, second, and third guide pipes.

[0017] This invention provides a double-layer vibrating grading and screening device for plastic granules. Compared with the prior art, it has the following advantages:

[0018] 1. With the special design of inserting the mounting bracket into the screen box and inserting filter plate one and filter plate two into the inside of the mounting bracket, when filter plate one and filter plate two need to be disassembled and replaced, the positioning mechanism for positioning the two contact plates between the screen box and the screen box is eliminated. Personnel can pull the mounting bracket upward to pull it out of the screen box, thereby pulling filter plate one and filter plate two out of the mounting bracket for disassembly. The operation is simple, reducing the difficulty of disassembly and replacement of filter plate one and filter plate two.

[0019] 2. The design of the screen box tilting downwards along the discharge port facilitates the flow of the screened plastic granules in the screen box to discharge port 1, discharge port 2 and discharge port 3, which is beneficial for feeding the screened plastic granules.

[0020] 3. The design of guide pipe 1, guide pipe 2 and guide pipe 3 achieves the guiding effect of plastic granules of various specifications discharged through discharge port 1, discharge port 2 and discharge port 3. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown;

[0023] Figure 2 A schematic diagram of the installation structure of the vibration motor of this utility model is shown;

[0024] Figure 3 A schematic diagram of the installation structure of the feed tube three of this utility model is shown;

[0025] Figure 4 A schematic diagram of the installation structure of the filter plate of this utility model is shown;

[0026] Figure 5 This utility model illustrates Figure 4 Enlarged view of point A in the middle;

[0027] Figure 6 A schematic diagram of the installation structure of the positioning cylinder of this utility model is shown;

[0028] Figure 7 A schematic diagram of the positioning mechanism of this utility model is shown;

[0029] The following components are shown in the diagram: 1. Base plate; 2. Support plate; 21. Spring 1; 22. Connecting plate; 23. Screen box; 231. Discharge port 1; 232. Discharge port 2; 233. Discharge port 3; 234. Guide pipe 1; 235. Guide pipe 2; 236. Guide pipe 3; 24. Vibration motor; 3. Mounting frame; 31. Contact plate; 311. Perforation; 312. Limiting slot; 32. Filter plate 1; 321. Filter hole 1; 33. Filter plate 2; 331. Filter hole 2; 4. Positioning mechanism; 41. Positioning rod; 411. Positioning cylinder; 412. Connecting rod; 413. Clamping rod; 414. Spring 2; 5. Feeding assembly; 51. Collection box; 52. Conveying cylinder; 521. Feed inlet; 522. Discharge pipe; 53. Screw rod; 54. Motor; 6. Storage box. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] Example

[0032] To address the technical problems in the background section, the following double-layer vibration grading and screening device for plastic granules is provided:

[0033] Combination Figures 1-7 As shown, the double-layer vibration grading and screening device for plastic granules provided by this utility model includes a base plate 1, a support plate 2 symmetrically fixedly installed on the top of the base plate 1, elastic units installed on both sides of the top of the support plate 2, and a connecting plate 22 connected to the top of the two sets of elastic units. The elastic unit includes two springs 21 that are both vertical and fixedly installed on the top of the support plate 2, and the top of the springs 21 is fixedly connected to the bottom of the connecting plate 22. A screen box 23 is welded between the two connecting plates 22. The top of the screen box 23 is open, and a vibration motor 24 is fixedly installed at the bottom of the screen box 23.

[0034] The sieve box 23 is equipped with a mounting bracket 3 with a U-shaped cross-section. Specifically, when the mounting bracket 3 is inserted into the sieve box 23, the outer side wall of the mounting bracket 3 fits snugly against the inner side wall of the sieve box 23. Contact plates 31 are integrally formed on both top sides of the mounting bracket 3, allowing them to fit against the top of the sieve box 23. A first filter plate 32 and a second filter plate 33 are inserted into the inner side of the mounting bracket 3 along its open end. The first filter plate 32 is located in the middle of the inner side of the mounting bracket 3, and the second filter plate 33 is located at the bottom of the inner side of the mounting bracket 3. The top of filter plate 32 has several filter holes 321, and the top of filter plate 33 has several filter holes 331. The diameter of filter hole 321 is larger than that of filter hole 331. The screen box 23 has discharge port 231, discharge port 232 and discharge port 333 on the side near the opening of the mounting frame 3. The bottom of discharge port 231 is flush with the top of filter plate 32, discharge port 232 is flush with the top of filter plate 33, and discharge port 333 is flush with the bottom wall of the screen box 23.

[0035] The top of the screen box 23 is equipped with a positioning mechanism 4 that acts on the two contact plates 31. When the two contact plates 31 are in contact with the top of the screen box 23, the positioning mechanism 4 can position or cancel the positioning between the two contact plates 31 and the screen box 23. The top of the bottom plate 1 and the side of the screen box 23 away from the discharge port 231 are equipped with a feeding component 5 for feeding plastic granules. The discharge end of the feeding component 5 is located above the top opening of the screen box 23. It is worth noting that the feeding component 5 does not affect the insertion of the mounting bracket 3 into the screen box 23.

[0036] During installation, filter plate 32 is inserted into the middle of the inner side of mounting frame 3, and filter plate 33 is inserted into the bottom of the inner side of mounting frame 3. Mounting frame 3 is then inserted into the inner side of screen box 23. The positioning mechanism 4 fixes the two contact plates 31 to screen box 23. The vibration motor 24 is then turned on, causing the screen box 23 to vibrate. Multiple springs 21 continuously deform, and the plastic particles to be screened are conveyed into screen box 23 through feeding assembly 5. The plastic granules to be screened fall onto filter plate 32. Particles smaller than the aperture of filter hole 321 fall through filter hole 321 onto filter plate 33, and particles smaller than the aperture of filter hole 331 fall through filter hole 331 onto the bottom wall of the screen box 23. During this process, under the continuous vibration of the screen box 23, the plastic granules falling onto filter plate 32, filter plate 33, and the bottom wall of the screen box 23 are discharged through discharge port 23 respectively. 1. The discharge ports 232 and 233 discharge outwards, achieving a double-layer vibration grading and screening effect. Through a special design that inserts the mounting frame 3 into the screen box 23 and the filter plates 32 and 33 into the inner side of the mounting frame 3, when it is necessary to disassemble and replace the filter plates 32 and 33, the positioning mechanism 4 for positioning the two contact plates 31 between them and the screen box 23 is eliminated. Personnel can then pull the mounting frame 3 upwards to remove it from the screen box 23, thereby pulling the filter plates 32 and 33 outwards from the mounting frame 3 for disassembly. This simple operation replaces the previous method of first removing the screws securing the upper filter plate, then removing the upper filter plate, and finally removing the screws securing the lower filter plate, thus reducing the difficulty of disassembly and replacement of the filter plates 32 and 33.

[0037] Combination Figures 1-7 As shown, the positioning mechanism 4 includes positioning rods 41 arranged in a rectangular array and rotatably mounted on the top of the screen box 23. Two contact plates 31 each have symmetrically arranged through holes 311. The four positioning rods 41 can pass through the four through holes 311 and engage with the contact plates 31. In use, rotating the four positioning rods 41 allows them to pass through the four through holes 311, thus removing the mounting frame 3 from the screen box 23 and eliminating the positioning effect between the mounting frame 3 and the screen box 23. Conversely, when installing the mounting frame 3, rotating the four positioning rods 41 allows them to pass through the four through holes 311. When the mounting frame 3 is inserted into the screen box 23, the through holes 311 on the contact plates 31 are fitted over the corresponding positioning rods 41 on the top of the screen box 23. Rotating the four positioning rods 41 again allows the ends of the positioning rods 41 to be located outside the through holes 311, thus fixing the contact plates 31 and the screen box 23 and achieving the fixing effect of the mounting frame 3.

[0038] Combination Figures 1-7 As shown, the feeding assembly 5 includes a collection box 51 fixedly installed on the top of the base plate 1. A conveying cylinder 52 is fixedly installed on the top of the collection box 51. The bottom of the conveying cylinder 52 extends into the collection box 51 and is flush with the inner bottom wall of the collection box 51. An inlet 521 communicating with the interior is opened at the bottom of the outer wall of the conveying cylinder 52. A discharge pipe 522 is fixedly installed at the top of the outer wall of the conveying cylinder 52 on the side near the screen box 23. The other end of the discharge pipe 522 extends above the screen box 23 and is flush with the inner wall of the screen box 23 on the side near the conveying cylinder 52. The discharge pipe 522 is inclined downward in the direction away from the conveying cylinder 52. The conveying cylinder 52 is rotatably mounted inside the conveying cylinder 52. The conveyor is equipped with an auger rod 53, the outer wall of which is in contact with the inner wall of the conveyor cylinder 52. A motor 54 is fixedly installed on the top of the conveyor cylinder 52 to drive the auger rod 53 to rotate. In use, the plastic granules to be screened are guided into the collection box 51, and the plastic granules can enter the conveyor cylinder 52 through the feed inlet 521. The motor 54 is turned on and drives the auger rod 53 to rotate in the conveyor cylinder 52, which conveys the plastic granules into the conveyor cylinder 52 upward along the conveyor cylinder 52. When the plastic granules are conveyed to the discharge pipe 522, they can flow into the screen box 23 through the discharge pipe 522 for feeding.

[0039] Combination Figures 1-7As shown, the positioning rod 41 includes a positioning cylinder 411 rotatably mounted on the top of the screen box 23. A connecting rod 412 is movably passed through the top of the positioning cylinder 411. A snap-fit ​​rod 413, which can movably pass through the through hole 311, is fixedly mounted on the top of the connecting rod 412. A spring 414, sleeved on the outside of the snap-fit ​​rod 413, is installed inside the positioning cylinder 411 and between the connecting rod 412 and the opposite side of the positioning cylinder 411. A limiting slot 312 communicating with the through hole 311 is opened on the top of the contact plate 31 and on one side of the through hole 311. When the spring 414 is in its natural state, the snap-fit ​​rod 413 can be inserted into the limiting slot 312 and snapped into the contact plate 31. Through the design of the positioning cylinder 411, connecting rod 412, snap-fit ​​rod 413 and spring 414, during use, when the mounting frame 3 is inserted into the screen box 23, the contact plate 31... When the perforation 311 is fitted onto the outside of the positioning rod 41 at the top of the screen box 23, the bottom of the locking rod 413 is located inside the perforation 311. At this time, the operator manually pulls the locking rod 413 to slide the connecting rod 412 outward from the positioning cylinder 411, causing the locking rod 413 to move above the contact plate 31. During this process, the second spring 414 deforms under the force. Then, the locking rod 413 is rotated to be positioned above the limiting slot 312, and the force on the locking rod 413 is released. The second spring 414 returns to its natural state, thereby driving the locking rod 413 downward through the connecting rod 412, so that the locking rod 413 is inserted into the limiting slot 312, and the locking rod 413 is locked with the contact plate 31. With the locking rod 413 inserted into the limiting slot 312 and the cooperation of the second spring 414, the positioning rod 41 is effectively locked and fixed between the contact plate 31 and the screen box 23.

[0040] Combination Figures 1-7 As shown, the screen box 23 is inclined downward along the direction of discharge port 1 231. The downward inclination of the screen box 23 along the direction of discharge port 1 231 facilitates the flow and discharge of the screened plastic particles in the screen box 23 towards discharge port 1 231, discharge port 232 and discharge port 3 233, which is beneficial for feeding the screened plastic particles.

[0041] Combination Figures 1-7 As shown, the screen box 23 is fixedly equipped with guide pipes 234, 235, and 236, which are respectively connected to discharge port 1 231, discharge port 232, and discharge port 3 233. The bottoms of guide pipes 234, 235, and 236 are flush. Through the design of guide pipes 234, 235, and 236, the plastic granules of various specifications discharged through discharge port 1 231, discharge port 232, and discharge port 3 233 are guided.

[0042] Combination Figures 1-7As shown, a storage box 6 is placed on the top of the base plate 1 and below the first guide pipe 234, the second guide pipe 235 and the third guide pipe 236. The top of the storage box 6 is open, and the design of the storage box 6 facilitates the collection of the screened plastic particles.

[0043] Working principle and usage process of this utility model:

[0044] The first step is to insert filter plate 32 into the middle position inside the mounting frame 3 and filter plate 33 into the bottom position inside the mounting frame 3 during installation. Rotate the four locking rods 413 so that they can pass through the four through holes 311 respectively. Insert the mounting frame 3 into the inside of the screen box 23. The through holes 311 on the contact plate 31 are fitted onto the outside of the corresponding positioning rod 41 at the top of the screen box 23. Manually pull the locking rod 413 to slide the connecting rod 412 outwards towards the positioning cylinder 411, so that the locking rod 413 is moved above the contact plate 31. Then rotate the locking rod 413 so that it is above the limiting slot 312. Remove the force on the locking rod 413. The connecting rod 412 drives the locking rod 413 to move downwards, so that the locking rod 413 is inserted into the limiting slot 312 and locked with the contact plate 31. This completes the installation of filter plate 32 and filter plate 33.

[0045] In the second step, during the screening of plastic granules, the vibrating motor 24 is turned on, causing the screen box 23 to vibrate. The plastic granules to be screened are guided into the collection box 51. The motor 54 is then turned on, causing the auger rod 53 to rotate inside the conveyor cylinder 52. The plastic granules entering the conveyor cylinder 52 are conveyed upwards along the conveyor cylinder 52 and flow through the discharge pipe 522 into the screen box 23. The plastic granules to be screened fall onto the filter plate 32. Plastic granules smaller than the aperture of the filter holes 321 pass through the filter plate. Plastic particles smaller than the aperture of filter hole 321 fall downwards onto filter plate 33. Plastic particles that fall through filter hole 331 fall downwards onto the bottom wall of screen box 23. Plastic particles that fall onto filter plate 32, filter plate 33 and the bottom wall of screen box 23 are discharged outwards through discharge port 1 231, discharge port 232 and discharge port 3 233 respectively. They then fall into three storage boxes 6 for collection through guide pipe 1 234, guide pipe 235 and guide pipe 3 236 respectively.

[0046] The third step involves disassembling and replacing filter plate 32 and filter plate 33. Pull each of the four locking rods 413 upwards to move them above the contact plate 31. Then rotate each of the four locking rods 413 so that they can pass through the through hole 311. Personnel can then pull the mounting frame 3 upwards to remove it from the screen box 23, thereby pulling filter plate 32 and filter plate 33 outwards from the mounting frame 3 for disassembly.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A double-layer vibrating grading and screening device for plastic granules, characterized in that: The system includes a base plate, with support plates symmetrically fixedly installed on the top of the base plate. Elastic units are installed on both sides of the top of the support plates. The tops of the two sets of elastic units are connected to a connecting plate. Each elastic unit includes two springs, both vertical and fixedly installed on the top of the support plate. The top of each spring is fixedly connected to the bottom of the connecting plate. A screen box is welded between the two connecting plates. The top of the screen box is open, and a vibration motor is fixedly installed at the bottom of the screen box. The screen box is equipped with a mounting frame with a cross-section of U-shape. The top of both sides of the mounting frame is integrally formed with contact plates that can fit against the top of the screen box. Filter plate 1 and filter plate 2 are inserted into the inner side of the mounting frame along its open end. Filter plate 1 is located in the middle of the inner side of the mounting frame, and filter plate 2 is located at the bottom of the inner side of the mounting frame. Filter plate 1 has several filter holes 1 on its top, and filter plate 2 has several filter holes 2 on its top. The diameter of filter holes 1 is larger than that of filter holes 2. Discharge port 1, discharge port 2 and discharge port 3 are opened on the side of the screen box near the open end of the mounting frame. The bottom of discharge port 1 is flush with the top of filter plate 1, discharge port 2 is flush with the top of filter plate 2, and discharge port 3 is flush with the bottom wall of the screen box. The top of the screen box is equipped with a positioning mechanism that acts on two contact plates. When the two contact plates are in contact with the top of the screen box, the positioning mechanism can position or cancel the positioning between the two contact plates and the screen box. A feeding component for feeding plastic granules is installed on the top of the bottom plate and on the side of the screen box away from the discharge port. The discharge end of the feeding component is located above the opening at the top of the screen box.

2. The double-layer vibration grading and screening device for plastic granules according to claim 1, characterized in that: The positioning mechanism includes positioning rods arranged in a rectangular array and rotatably mounted on the top of the screen box. Two contact plates are symmetrically provided with through holes, and the four positioning rods can pass through the four through holes and engage with the contact plates respectively.

3. The double-layer vibration grading and screening device for plastic granules according to claim 1, characterized in that: The feeding assembly includes a collection box fixedly installed on the top of the base plate, a conveying cylinder fixedly installed on the top of the collection box, the bottom of the conveying cylinder extending into the collection box and fitting against the bottom wall of the collection box, a feed inlet connected to the inside of the conveying cylinder at the bottom of the outer side wall, a discharge pipe fixedly installed at the top of the outer side wall of the conveying cylinder near the screen box, the other end of the discharge pipe extending above the screen box and flush with the inner wall of the screen box near the conveying cylinder, and the discharge pipe inclined downward in the direction away from the conveying cylinder, an auger rod rotatably installed inside the conveying cylinder, the outer side wall of the auger rod fitting against the inner side wall of the conveying cylinder, and a motor for driving the auger rod to rotate fixedly installed on the top of the conveying cylinder.

4. The double-layer vibration grading and screening device for plastic granules according to claim 2, characterized in that: The positioning rod includes a positioning cylinder rotatably mounted on the top of the screen box. A connecting rod is movably inserted through the top of the positioning cylinder. A snap-fit ​​rod that can movably pass through the perforation is fixedly installed on the top of the connecting rod. A second spring is installed inside the positioning cylinder and between the connecting rod and the positioning cylinder on the opposite side, and is sleeved on the outside of the snap-fit ​​rod. A limiting slot communicating with the perforation is opened on the top of the contact plate and on one side of the perforation. When the second spring is in its natural state, the snap-fit ​​rod can be inserted into the limiting slot and snapped into the contact plate.

5. The double-layer vibration grading and screening device for plastic granules according to claim 1, characterized in that: The screen box is inclined downward along the discharge port.

6. The double-layer vibration grading and screening device for plastic granules according to claim 1, characterized in that: The screen box is fixedly equipped with guide pipes 1, 2, and 3, which are respectively connected to discharge port 1, discharge port 2, and discharge port 3. The bottoms of guide pipes 1, 2, and 3 are flush.

7. The double-layer vibration grading and screening device for plastic granules according to claim 6, characterized in that: Storage boxes are placed on the top of the base plate and below the first, second, and third guide pipes.

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