Plastic particle screening device

Abstract

The invention relates to the technical field of plastic recycling, in particular to a plastic particle screening device which comprises a base shell and multiple layers of screens and further comprises multiple pop-up plates, the multiple pop-up plates are installed among the multiple layers of screens and right face screen holes in the screens, the sides, right facing the screens, of the pop-up plates are inclined planes, and the multiple layers of screens are arranged on the base shell. The multiple crushing cutters are movably arranged on the side, right opposite to the screen holes of the screen, of the pop-up plate; the discharging driving unit is arranged on the screen and connected with the pop-up plate, the discharging driving unit drives the pop-up plate to pop up synchronously when the screen vibrates, and long-strip-shaped plastic fragments falling into the screen holes are pushed out of the plastic particle screening device. The plastic particles can be more effectively screened in a grading mode, particularly, the inclined face structure of the plastic particle screening device is beneficial to pushing out long-strip-shaped plastic fragments falling into the screening holes, and the long-strip-shaped plastic fragments are prevented from being mixed into fine particles.

Description

Technical Field

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

[0002] Plastic granule screening is a process of separating granules according to their size. Specifically, screening is the process of using a perforated screen surface to separate mixed materials of different particle sizes into various particle size grades. In the production or recycling process of plastic granules, screening is an important link, which aims to remove oversized or undersized particles and impurities to improve the quality and utilization rate of particles. Common methods of plastic granule screening include screening and grading. These methods can separate particles according to their particle size, density, shape and other characteristics. Through screening, the fineness and uniformity of the material can be achieved. Fineness refers to the size of the diameter of the material particles, while uniformity refers to the difference in diameter between particles. The fineness and uniformity of plastic particles are very important for molding. The processing process is crucial, as it directly affects the quality and performance of the product. Screened plastic particles are easier to distribute evenly during the molding process, resulting in better molding effects and higher product quality. The screening tools currently widely used on the market can effectively screen plastic fragments by width, but their control capabilities in the length dimension are obviously insufficient. Therefore, even after the screening process, small particles may still be mixed with plastic particles that do not meet the length standards. These overlong particles are prone to blockage and uneven filling during the production process, which in turn affects the performance of the final product, including strength loss and appearance defects, which seriously reduces product quality. To this end, we propose a plastic particle screening device. Summary of the invention

[0003] One of the technical problems to be solved by the present application is that, even after the screening process, plastic particles whose length does not meet the standards may still be mixed in the fine particles. These overlong particles can easily cause blockage and uneven filling during the production process, thereby affecting the performance of the final product.

[0004] To solve the above technical problems, the embodiment of the present application provides a plastic particle screening device, including a base shell and a screen, and the screen is provided with multiple layers, and also includes a pop-up plate, wherein the pop-up plate is provided in plurality, and the plurality of pop-up plates are installed between the multiple layers of the screen, the pop-up plate is opposite to the screen holes on the screen, and the pop-up plate is opposite to the screen on a side thereof, which is an inclined surface; a crushing knife, wherein the crushing knife is provided in plurality, and the plurality of crushing knives are movably arranged on a side of the pop-up plate opposite to the screen holes of the screen; a discharging drive unit, wherein the discharging drive unit is provided on the screen and connected to the pop-up plate, and the pop-up plate is driven to pop out synchronously when the screen vibrates, so as to push out the long strips of plastic fragments that fall into the screen holes; a crushing drive unit, wherein the crushing drive unit is provided on the screen, the crushing drive unit is connected to the crushing knife, and the crushing drive unit is located between the multiple layers of the screen, and the crushing drive unit is driven to expand and fit the screen, and the expanded crushing knife is synchronously driven to reciprocate, so as to crush and cut the long strips of plastic fragments stuck in the screen holes.

[0005] In some embodiments, the discharge drive unit includes an impact piece arranged on the screen, which is used to drive the pop-up plate to push the long plastic fragments. The impact piece is provided with a power piece, which is used to provide power for the impact piece. The pop-up plate is provided with a blowing piece, which is used to blow away the small plastic fragments.

[0006] In some embodiments, the impact member includes a connecting plate slidably arranged on the screen, the connecting plate is located between multiple layers of screens, and the connecting plate is Y-shaped, a positioning plate is arranged on the connecting plate, sliding rods are slidably arranged at both ends of the positioning plate, one end of the sliding rod is connected to the pop-up plate, a limiting plate is arranged on the side of the sliding rod away from the pop-up plate, and an extrusion spring is sleeved on the sliding rod between the pop-up plate and the positioning plate.

[0007] In some embodiments, the power part includes a plurality of receiving grooves opened in the shell, the receiving grooves are located on both sides of the shell, a multi-stage telescopic rod is arranged in the receiving groove, a limiting rod is arranged on the multi-stage telescopic rod, the limiting rod is a triangular rod, the limiting rod is slidably connected to the receiving groove, a buffer spring is sleeved on the multi-stage telescopic rod, an extrusion plate is arranged on the end of the sliding rod away from the pop-up plate, and the extrusion plate is in contact with the limiting rod.

[0008] In some embodiments, the blow-off member includes a plurality of exhaust grooves opened on the pop-up plate, an expansion airbag is arranged at the bottom of the pop-up plate, the expansion airbag is connected to the exhaust groove, a fixing plate is arranged inside the expansion airbag, a reset spring is arranged on the fixing plate, and a reset plate is arranged on the reset spring.

[0009] In some embodiments, the crushing drive unit includes an unfolding member arranged on the pop-up plate, and the crushing knife is driven to rotate and unfold by the unfolding member. A moving member is arranged in the shell, and the crushing knife is driven to move in the shell by the moving member. A locking member is arranged on the limiting rod, and the limiting rod is locked by the locking member.

[0010] In some embodiments, the unfolding member includes a recovery groove provided on the pop-up plate, a rotating shaft is rotatably arranged in the recovery groove, the rotating shaft is connected to the crushing knife, a through groove is provided on one side of the shell, the rotating shaft passes through the through groove, a plurality of guide rails are provided outside the shell, an extension rod is slidably arranged in the guide rail, a power bin is slidably arranged on the extension rod, one end of the rotating shaft is located outside the shell and is rotatably connected to the power bin, one end of the rotating shaft is located inside the power bin and a worm gear is provided, a rotating rod is rotatably arranged in the power bin, one end of the rotating rod passes through the power bin, and a worm engaged with the worm gear is provided on the rotating rod.

[0011] In some embodiments, the moving part includes a slider slidably arranged on the inner wall of the shell, a moving screw is rotatably arranged on the slider, a moving gear is arranged on the moving screw, and a moving rack engaged with the moving gear is arranged on the shell.

[0012] In some embodiments, the locking member includes a connecting rod rotatably set on a limiting rod, one end of the connecting rod passes through the shell and is slidably connected to the shell, a handle is set at one end of the connecting rod outside the shell, a locking rod is set on the handle, and a locking groove is set on the shell for use with the locking rod.

[0013] In some embodiments, a protective shell is disposed on the shell, and an observation window is disposed on the protective shell, and the observation window is made of transparent acrylic material.

[0014] The present invention has at least the following beneficial effects:

[0015] 1. Improve screening accuracy: The design of the pop-up plate can more effectively classify and screen plastic particles. In particular, its inclined structure helps to push out the long plastic fragments that fall into the sieve holes, preventing the long plastic fragments from mixing into the fine particles, thereby significantly improving the screening accuracy and quality;

[0016] 2. Prevent screen clogging: The design of the crushing drive unit enables the device to quickly handle the clogging problem that may occur during the screening process. When the screen is observed to be blocked, the staff drives the crushing knife to unfold through the unfolding piece, and uses the driving force generated by the vibration of the screen to drive the crushing knife to crush and cut the plastic fragments stuck on the screen hole, further ensuring the smooth screening;

[0017] 3. Improve the flexibility of the device: The design of the unfolding piece allows the crushing knife to be unfolded or retracted as needed, and can move inside the shell to adapt to blockages of different positions and sizes. This flexibility and adjustability greatly improves the scope of application and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 Schematic diagram of the structure with the base and shell removed;

[0020] Figure 3 For the present invention Figure 2 Schematic diagram of explosion structure;

[0021] Figure 4 It is a schematic diagram of the structure of the discharging drive unit and the crushing drive unit of the present invention;

[0022] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of the middle A area;

[0023] Figure 6 For the present invention Figure 1 Schematic diagram of the explosion structure after the base is removed;

[0024] Figure 7 It is a schematic diagram of the structure of the impact piece of the present invention;

[0025] Figure 8 For the present invention Figure 7 Another structural diagram;

[0026] Fig. 9 For the present invention Figure 7 Schematic diagram of explosion structure;

[0027] Fig.10 This is a structural diagram of Embodiment 2 of the present invention.

[0028] In the figure: 1, base; 2, shell; 3, screen; 4, pop-up plate; 5, crushing knife; 6, discharge drive unit; 7, impact piece; 71, connecting plate; 72, positioning plate; 73, sliding rod; 74, limit plate; 75, extrusion spring; 8, power piece; 81, receiving groove; 82, multi-stage telescopic rod; 83, limiting rod; 84, buffer spring; 85, extrusion plate; 9, blow-off piece; 91, exhaust groove; 92, expansion airbag; 93, fixing plate; 94, reset spring; 95, reset plate; 10, crushing drive moving unit; 11, unfolding part; 111, recovery groove; 112, rotating shaft; 113, through groove; 114, guide rail; 115, extension rod; 116, power compartment; 117, worm gear; 118, rotating rod; 119, worm; 12, moving part; 121, slider; 122, moving screw rod; 123, moving rack; 124, moving gear; 13, locking part; 131, connecting rod; 132, locking rod; 133, locking groove; 134, handle; 14, protective shell; 15, observation window. DETAILED DESCRIPTION

[0029] 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.

[0030] Example 1: Please refer to Figure 1-9 The present invention provides a technical solution: a plastic particle screening device, comprising a base 1, a shell 2 and a screen 3, wherein the screen 3 is provided with multiple layers, and further comprising a pop-up plate 4, wherein a plurality of pop-up plates 4 are provided, and the plurality of pop-up plates 4 are installed between the multiple layers of the screen 3, wherein the pop-up plates 4 are directly opposite to the sieve holes on the screen 3, and the side of the pop-up plates 4 directly opposite to the screen 3 is an inclined surface; a crushing knife 5, wherein a plurality of crushing knives 5 are provided, and the plurality of crushing knives 5 are movably arranged on the side of the pop-up plate 4 directly opposite to the sieve holes of the screen 3.

[0031] The discharging drive unit 6 is arranged on the screen 3 and connected to the pop-up plate 4. When the screen 3 vibrates, the discharging drive unit 6 drives the pop-up plate 4 to pop out synchronously, so as to push out the long strip plastic fragments falling into the screen hole.

[0032] The advantage of the discharge drive unit 6 is that during the screening process, long plastic fragments are easily stuck in the sieve holes, resulting in reduced screening efficiency. This design can timely and effectively push these fragments out of the sieve holes through the synchronous ejection of the ejection plate 4, thereby preventing the sieve holes from being blocked and maintaining the smoothness of the screen 3. At the same time, the mixing of long plastic fragments will affect the uniformity and purity of the particles after screening. This design prevents the fragments from clogging the sieve holes through the ejection plate 4, ensuring that the particles after screening are more in line with the requirements and improving the screening accuracy.

[0033] The design of the pop-up plate 4 can more effectively grade and screen the plastic particles. In particular, its inclined structure helps to push out the long plastic fragments that fall into the sieve holes and prevent the long plastic fragments from mixing into the fine particles, thereby significantly improving the screening accuracy and quality.

[0034] A crushing drive unit 10 is provided on the screen 3. The crushing drive unit 10 is connected to the crushing knife 5. The crushing drive unit 10 is located between the multiple layers of screens 3. The crushing drive unit 10 drives the crushing knife 5 to unfold and fit the screen 3, and simultaneously drives the unfolded crushing knife 5 to move back and forth, so as to crush and cut the long strips of plastic fragments stuck on the screen holes.

[0035] The advantage of the crushing drive unit 10 is that it can drive the crushing knife 5 to expand without stopping the machine to crush the fragments stuck in the holes of the screen 3 and make them separate from the holes of the screen 3. In the traditional screening process, once the screen 3 is blocked, it is often necessary to stop the machine for manual cleaning, which will affect the continuity of the screening. However, this design can solve the blockage problem without interrupting the screening process by expanding the crushing knife 5 without stopping the machine, thereby improving the continuity and production efficiency of the screening. Long-term blockage may lead to a decrease in screening quality because the blocked fragments may hinder the normal screening of other particles. This design ensures the stability of the screening process and the quality of the particles after screening by timely cleaning the fragments. At the same time, the blockage of the screen 3 not only affects the screening efficiency, but also may cause damage to the screen 3. This design reduces the additional pressure on the screen 3 by timely cleaning the fragments, thereby extending the service life of the screen 3.

[0036] The discharge driving unit 6 includes an impact piece 7 arranged on the screen 3, and the impact piece 7 is used to drive the pop-up plate 4 to push the long strips of plastic fragments. The impact piece 7 is provided with a power piece 8, and the power piece 8 is used to provide power for the impact piece 7. The pop-up plate 4 is provided with a blowing piece 9, and the blowing piece 9 is used to blow away the small plastic fragments.

[0037] The impact member 7 includes a connecting plate 71 slidably arranged on the screen 3, the connecting plate 71 is located between the multiple layers of screens 3, and the connecting plate 71 is Y-shaped. A positioning plate 72 is arranged on the connecting plate 71, and sliding rods 73 are slidably arranged at both ends of the positioning plate 72. One end of the sliding rod 73 is connected to the pop-up plate 4, and a limiting plate 74 is arranged on the side of the sliding rod 73 away from the pop-up plate 4. An extrusion spring 75 is sleeved on the sliding rod 73 between the pop-up plate 4 and the positioning plate 72.

[0038] The advantage of the impact member 7 is that it can push the pop-up plate 4 to pop out, so that it can push out the long plastic fragments that fall into the sieve hole, preventing the long plastic fragments from mixing into the fine particles. In particular, its inclined structure can more effectively push out the fragments, thereby significantly improving the screening accuracy and quality.

[0039] The power member 8 includes a plurality of receiving grooves 81 opened in the shell 2, and the receiving grooves 81 are located on both sides of the shell 2. A multi-stage telescopic rod 82 is arranged in the receiving groove 81, and a limiting rod 83 is arranged on the multi-stage telescopic rod 82. The limiting rod 83 is a triangular rod, and the limiting rod 83 is slidably connected with the receiving groove 81. A buffer spring 84 is sleeved on the multi-stage telescopic rod 82. An extrusion plate 85 is arranged on the end of the sliding rod 73 away from the pop-up plate 4, and the extrusion plate 85 is in contact with the limiting rod 83.

[0040] The blow-off member 9 includes a plurality of exhaust grooves 91 provided on the pop-up plate 4, an expansion airbag 92 is provided at the bottom of the pop-up plate 4, the expansion airbag 92 is connected to the exhaust groove 91, a fixing plate 93 is provided in the expansion airbag 92, a return spring 94 is provided on the fixing plate 93, and a return plate 95 is provided on the return spring 94.

[0041] The advantage of the blow-off member 9 is that it can blow away the tiny plastic fragments from the position of the ejection plate 4 and the sieve hole. During the screening process, the tiny plastic fragments may be retained on the ejection plate 4 and the sieve hole due to static electricity, adhesion, etc., resulting in secondary clogging of the sieve hole. The blowing-off member 9 can blow away these tiny fragments in time to prevent them from clogging the sieve hole again, thereby maintaining the patency of the sieve 3.

[0042] When the screen 3 is working, it will start to vibrate up and down. When the screen 3 rises, the positioning plate 72 connected to the screen 3 will drive the sliding rod 73 slidingly arranged thereon to rise synchronously. When the sliding rod 73 rises, the extrusion plate 85 arranged thereon contacts with the limiting rod 83, and drives the extrusion spring 75 to be compressed under the restriction of the limiting rod 83. During the continuous rising process of the screen 3, the tension on the extrusion plate 85 becomes larger, so that it overcomes the elastic force of the limiting rod 83 and the buffer spring 84 to push the limiting rod 83 into the receiving groove 81. At this time, the extrusion plate 85 and the sliding rod 73 are disengaged from the limit, and the extrusion spring 75 releases the elastic force, thereby pushing the pop-up plate 4 to pop out, and the long strips of plastic fragments that fall into the sieve holes of the screen 3 are pushed out of the sieve holes.

[0043] The crushing drive unit 10 includes an unfolding member 11 arranged on the pop-up plate 4, and the unfolding member 11 is used to drive the crushing knife 5 to rotate and unfold. A moving member 12 is arranged in the shell 2, and the moving member 12 is used to drive the crushing knife 5 to move in the shell 2. A locking member 13 is arranged on the limiting rod 83, and the locking member 13 is used to lock the limiting rod 83.

[0044] The unfolding member 11 includes a recovery groove 111 provided on the pop-up plate 4, a rotating shaft 112 is rotatably arranged in the recovery groove 111, and the rotating shaft 112 is connected to the crushing knife 5, a through groove 113 is provided on one side of the shell 2, and the rotating shaft 112 passes through the through groove 113, and a plurality of guide rails 114 are arranged outside the shell 2, an extension rod 115 is slidably arranged in the guide rail 114, and a power bin 116 is slidably arranged on the extension rod 115, one end of the rotating shaft 112 is located outside the shell 2 and is rotatably connected to the power bin 116, one end of the rotating shaft 112 is located in the power bin 116 and is provided with a worm gear 117, a rotating rod 118 is rotatably arranged in the power bin 116, one end of the rotating rod 118 passes through the power bin 116, and a worm 119 engaged with the worm gear 117 is arranged on the rotating rod 118.

[0045] The advantage of the deployment member 11 is that the crushing knife 5 can be deployed or retracted as needed to adapt to blockages of different positions and sizes. This flexibility and adjustability greatly improves the scope of application and practicality of the device.

[0046] The moving member 12 includes a slider 121 slidably disposed on the inner wall of the housing 2 , a moving screw 122 rotatably disposed on the slider 121 , a moving gear 124 disposed on the moving screw 122 , and a moving rack 123 engaged with the moving gear 124 disposed on the housing 2 .

[0047] The benefit of the movable member 12 is that it can drive the crushing knife 5 to move along the screen 3 in the housing 2, thereby improving the cutting effect of the crushing knife 5 on the plastic fragments.

[0048] The locking member 13 includes a connecting rod 131 rotatably set on the limiting rod 83, one end of the connecting rod 131 passes through the shell 2 and is slidably connected to the shell 2, and a handle 134 is set at one end of the connecting rod 131 outside the shell 2, and a locking rod 132 is set on the handle 134, and a locking groove 133 used in conjunction with the locking rod 132 is set on the shell 2.

[0049] The benefit of the locking member 13 is that it can control the retraction of the limiting rod 83 when crushing the plastic fragments, thereby avoiding interference with the cutting of the crushing knife 5, thereby effectively improving the efficiency of crushing the plastic.

[0050] When the staff observes that the sieve holes of the screen 3 are blocked, the staff first pulls the connecting rod 131 to drive the limiting rod 83 connected thereto to retract into the receiving groove 81. At this time, the locking rod 132 connected to the connecting rod 131 is simultaneously disengaged from the locking groove 133. When the locking rod 132 is completely disengaged, the connecting rod 131 is rotated again so that the locking rod 132 is not engaged with the locking groove 133, thereby completing the locking of the limiting rod 83.

[0051] After completion, the staff rotates the rotating rod 118, and the rotation of the rotating rod 118 drives the worm 119 arranged thereon to rotate synchronously, and the rotation of the worm 119 drives the worm wheel 117 engaged therewith to rotate synchronously, and the rotation of the worm wheel 117 drives the rotating shaft 112 to rotate synchronously, and the rotation of the rotating shaft 112 drives the crushing knife 5 connected thereto to rotate and unfold. At the same time, due to the self-locking characteristics of the worm wheel 117 and the worm 119, the crushing knife 5 can remain in the unfolded state, thereby improving the stability during cutting.

[0052] When the screen 3 rises, it will drive the positioning plate 72, the moving screw rod 122 and the slider 121 to move up and down. When the moving screw rod 122 moves up and down, it will drive the moving gear 124 to move synchronously. During the movement of the moving gear 124, it will engage with the moving rack 123, thereby driving the moving screw rod 122 to rotate synchronously, and then driving the positioning plate 72 and the crushing knife 5 connected to the positioning plate 72 to move.

[0053] When in use, the screen 3 will start to vibrate up and down when working. When the screen 3 rises, the positioning plate 72 connected to the screen 3 will drive the sliding rod 73 slidingly arranged thereon to rise synchronously. When the sliding rod 73 rises, the extrusion plate 85 arranged thereon contacts with the limiting rod 83, and drives the extrusion spring 75 to be compressed under the restriction of the limiting rod 83. During the continuous rising process of the screen 3, the tension on the extrusion plate 85 becomes larger, so that it overcomes the elastic force of the limiting rod 83 and the buffer spring 84 to push the limiting rod 83 into the receiving groove 81. At this time, the extrusion plate 85 and the sliding rod 73 are disengaged from the limit, and the extrusion spring 75 releases the elastic force, thereby pushing the pop-up plate 4 to pop out, and the long strips of plastic fragments that fall into the sieve holes of the screen 3 are pushed out of the sieve holes.

[0054] When the staff observes that the sieve holes of the screen 3 are blocked, the staff first pulls the connecting rod 131 to drive the limiting rod 83 connected thereto to retract into the receiving groove 81. At this time, the locking rod 132 connected to the connecting rod 131 is simultaneously disengaged from the locking groove 133. When the locking rod 132 is completely disengaged, the connecting rod 131 is rotated again so that the locking rod 132 is not engaged with the locking groove 133, thereby completing the locking of the limiting rod 83.

[0055] After completion, the staff rotates the rotating rod 118, and the rotation of the rotating rod 118 drives the worm 119 arranged thereon to rotate synchronously, and the rotation of the worm 119 drives the worm wheel 117 engaged therewith to rotate synchronously, and the rotation of the worm wheel 117 drives the rotating shaft 112 to rotate synchronously, and the rotation of the rotating shaft 112 drives the crushing knife 5 connected thereto to rotate and unfold. At the same time, due to the self-locking characteristics of the worm wheel 117 and the worm 119, the crushing knife 5 can remain in the unfolded state, thereby improving the stability during cutting.

[0056] When the screen 3 rises, it will drive the positioning plate 72, the moving screw rod 122 and the slider 121 to move up and down. When the moving screw rod 122 moves up and down, it will drive the moving gear 124 to move synchronously. During the movement of the moving gear 124, it will engage with the moving rack 123, thereby driving the moving screw rod 122 to rotate synchronously, and then driving the positioning plate 72 and the crushing knife 5 connected to the positioning plate 72 to move.

[0057] Example 2: Please refer to Fig.10 The present invention provides a technical solution: a protective shell 14 is provided on the shell body 2, and an observation window 15 is provided on the protective shell 14. The observation window 15 is made of transparent acrylic material. The advantages of the protective shell 14 and the observation window 15 are that they not only protect the operators from dust damage during the screening process, but also allow them to observe the screening process at any time, ensuring the safety and visibility of the operation.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0059] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A plastic particle screening device, comprising a base (1), a housing (2) and a screen (3), wherein the screen (3) is provided with multiple layers, characterized in that: Also includes: A pop-up plate (4), wherein a plurality of pop-up plates (4) are provided, and the plurality of pop-up plates (4) are installed between the multiple layers of screens (3), the pop-up plates (4) are directly opposite to the screen holes on the screens (3), and the side of the pop-up plates (4) directly opposite to the screens (3) is an inclined surface; A crushing knife (5), wherein a plurality of the crushing knives (5) are provided, and the plurality of the crushing knives (5) are movably arranged on a side of the pop-up plate (4) facing the sieve holes of the sieve (3); A discharge drive unit (6), the discharge drive unit (6) being arranged on the screen (3) and connected to the ejection plate (4), and the discharge drive unit (6) drives the ejection plate (4) to be ejected synchronously when the screen (3) vibrates, thereby ejecting the long strips of plastic fragments that have fallen into the screen holes; A crushing drive unit (10), wherein the crushing drive unit (10) is arranged on the screen (3), the crushing drive unit (10) is connected to the crushing knife (5), and the crushing drive unit (10) is located between the multiple layers of the screen (3). The crushing drive unit (10) drives the crushing knife (5) to unfold and fit with the screen (3), and simultaneously drives the unfolded crushing knife (5) to reciprocate, so as to crush and cut the long strips of plastic fragments stuck on the screen holes.

2. The plastic particle screening device according to claim 1, characterized in that: The discharge drive unit (6) comprises an impact piece (7) arranged on the screen (3), and the impact piece (7) is used to drive the ejection plate (4) to push the long strip of plastic fragments. The impact piece (7) is provided with a power piece (8), and the power piece (8) is used to provide power for the impact piece (7). The ejection plate (4) is provided with a blow-off piece (9), and the blow-off piece (9) is used to blow away the small plastic fragments.

3. The plastic particle screening device according to claim 2, characterized in that: The impact member (7) comprises a connecting plate (71) slidably arranged on the screen (3), the connecting plate (71) is located between the multiple layers of screen (3), and the connecting plate (71) is Y-shaped. A positioning plate (72) is arranged on the connecting plate (71), and sliding rods (73) are slidably arranged at both ends of the positioning plate (72). One end of the sliding rod (73) is connected to the pop-up plate (4), and a limiting plate (74) is arranged on the side of the positioning plate (72) away from the pop-up plate (4) on the sliding rod (73). An extrusion spring (75) is sleeved on the sliding rod (73) between the pop-up plate (4) and the positioning plate (72).

4. The plastic particle screening device according to claim 3, characterized in that: The power member (8) comprises a plurality of receiving grooves (81) provided in the housing (2), the receiving grooves (81) being located on both sides of the housing (2), a multi-stage telescopic rod (82) being provided in the receiving grooves (81), a limiting rod (83) being provided on the multi-stage telescopic rod (82), the limiting rod (83) being a triangular rod, the limiting rod (83) being slidably connected to the receiving groove (81), a buffer spring (84) being sleeved on the multi-stage telescopic rod (82), an extrusion plate (85) being provided on one end of the sliding rod (73) away from the pop-up plate (4), the extrusion plate (85) being in contact with the limiting rod (83).

5. The plastic particle screening device according to claim 4, characterized in that: The blow-off member (9) comprises a plurality of exhaust grooves (91) formed on a pop-up plate (4); an expansion air bag (92) is arranged at the bottom of the pop-up plate (4); the expansion air bag (92) is connected to the exhaust grooves (91); a fixing plate (93) is arranged inside the expansion air bag (92); a return spring (94) is arranged on the fixing plate (93); and a return plate (95) is arranged on the return spring (94).

6. The plastic particle screening device according to claim 5, characterized in that: The crushing drive unit (10) comprises an unfolding member (11) arranged on the pop-up plate (4), and the unfolding member (11) is used to drive the crushing knife (5) to rotate and unfold; a moving member (12) is arranged in the housing (2), and the moving member (12) is used to drive the crushing knife (5) to move in the housing (2); a locking member (13) is arranged on the limiting rod (83), and the locking member (13) is used to lock the limiting rod (83).

7. The plastic particle screening device according to claim 6, characterized in that: The unfolding member (11) comprises a recovery slot (111) provided on the pop-up plate (4), a rotating shaft (112) being rotatably provided in the recovery slot (111), the rotating shaft (112) being connected to the crushing knife (5), a through slot (113) being provided on one side of the shell (2), the rotating shaft (112) passing through the through slot (113), a plurality of guide rails (114) being provided outside the shell (2), an extension rod (115) being slidably provided in the guide rails (114), the extension rods (115) being A power bin (116) is slidably arranged on the rod (115); one end of the rotating shaft (112) is located outside the housing (2) and is rotatably connected to the power bin (116); one end of the rotating shaft (112) is located inside the power bin (116) and is provided with a worm gear (117); a rotating rod (118) is rotatably arranged inside the power bin (116); one end of the rotating rod (118) passes through the power bin (116); and a worm (119) engaged with the worm gear (117) is arranged on the rotating rod (118).

8. The plastic particle screening device according to claim 7, characterized in that: The moving member (12) comprises a slider (121) slidably arranged on the inner wall of the housing (2); a moving screw rod (122) is rotatably arranged on the slider (121); a moving gear (124) is arranged on the moving screw rod (122); and a moving rack (123) meshing with the moving gear (124) is arranged on the housing (2).

9. The plastic particle screening device according to claim 8, characterized in that: The locking member (13) comprises a connecting rod (131) rotatably arranged on the limiting rod (83), one end of the connecting rod (131) passes through the shell (2) and is slidably connected to the shell (2), a handle (134) is arranged at one end of the connecting rod (131) outside the shell (2), a locking rod (132) is arranged on the handle (134), and a locking groove (133) used in conjunction with the locking rod (132) is arranged on the shell (2).

10. The plastic particle screening device according to claim 1, characterized in that: The housing (2) is provided with a protective shell (14), and the protective shell (14) is provided with an observation window (15), wherein the observation window (15) is made of a transparent acrylic material.

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