Waste polymer plastic recovery device and method for chemical recycling

Abstract

The invention discloses a waste polymer plastic recovery device and method for chemical reutilization, and relates to the technical field of plastic waste recovery, the device comprises a mounting bracket, a granulation device, a storage box body and a spiral conveying device, and is characterized in that an intermittent feeding mechanism is driven by an annular electric sliding rail; the concave bin periodically gets close to the bottom of the storage box body to receive plastic particles and is matched with the multifunctional plate to separate the storage box body, the opening and closing mechanism controls the cover plate to open and close, and accurate and quantitative material taking is achieved; and when the concave bin is far away, the particles are poured into the spiral conveying device through the inclined discharging mechanism. According to the device, gear-rack linkage and spring column design is adopted, mechanical self-feedback stretching and resetting of the concave bin are achieved, the circulating belt is combined to drive the multifunctional plate to act synchronously, and particle leakage and friction temperature rise are effectively avoided. Through intermittent conveying and mechanical linkage optimization, the problems of high energy consumption, heat-sensitive material degradation and equipment abrasion caused by traditional continuous conveying are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic waste recycling, and particularly to a waste polymer plastic recycling device and method for chemical reuse. Background Art

[0002] The recycling and reuse of waste polymer plastics is a complex process involving multiple steps, aiming to convert waste plastic products into reusable resources. First, the waste polymer plastics need to go through a pretreatment stage, which mainly includes crushing large plastic pieces into smaller fragments for subsequent processing. At the same time, the pretreatment process also includes a cleaning step to remove impurities and contaminants on the surface of the plastic fragments to ensure the purity of the recycled plastics. The pretreated plastic fragments will enter the homogenization stage. This stage is usually achieved through a granulating device, melting and extruding the plastic fragments into uniform granular shapes, which are called plastic pellets. Homogenization not only improves the uniformity of the plastic pellets but also provides convenient conditions for subsequent chemical treatment. The homogenized plastic pellets will enter the chemical cracking stage. In this stage, the plastic pellets undergo chemical decomposition under specific reaction conditions (such as high temperature, high pressure, or the action of a catalyst) to generate small molecule compounds or monomers, which can be further used to synthesize new polymer materials or other chemicals, thus realizing the chemical reuse of waste polymer plastics.

[0003] However, in the prior art, when the homogenized plastic pellets are transported to the reaction kettle, due to factors such as gravity flow design, pressure balance, and the high-position feed port that can completely empty the reaction kettle by gravity, the reaction kettle feed port is often set at a high position. When the pretreated waste plastics are highly transported by a screw conveyor, due to the continuous friction between the screw blades and the material, a large amount of heat is easily generated, resulting in too high a temperature inside the conveyor. This overheating phenomenon may not only accelerate the degradation of the plastic pellets, affecting the effect of their chemical cracking and the quality of the products, but also cause damage to the screw conveyor itself, shortening its service life. In addition, overheating may also pose safety hazards such as fire or explosion, threatening the production environment and personnel safety.

[0004] Therefore, we propose a waste polymer plastic recycling device and method for chemical reuse. Summary of the Invention

[0005] The purpose of the present invention is to provide a waste polymer plastic recycling device and method for chemical reuse to solve the above deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a waste polymer plastic recycling device for chemical reuse, comprising a mounting bracket, and a granulating device, a storage box and a screw conveying device arranged on the mounting bracket, the storage box is used to temporarily store the plastic particles discharged by the granulating device, and the waste polymer plastic recycling device for chemical reuse also includes:

[0007] An annular electric slide rail is arranged on the side support, and a concave bin is installed on the annular electric slide rail through an intermittent feeding mechanism. When the annular electric slide rail is in a started state, the intermittent feeding mechanism causes the concave bin to rotate in an annular shape and approach the storage box body, so that the concave bin extends toward the bottom of the storage box body to receive the plastic particles;

[0008] The multifunctional board and the opening and closing mechanism are arranged on the mounting bracket by the driving member, and the opening and closing mechanism is also provided with a cover plate rotatably connected to the bottom opening of the storage box body. When the concave bin moves close to the storage box body, the driving member is driven by the intermittent feeding mechanism to insert the multifunctional board into the storage box body to form a segmentation, and the cover plate is opened by the opening and closing mechanism to enable the concave bin to receive the plastic particles below the segmented multifunctional board;

[0009] The tilting discharge mechanism is arranged between the concave bin and the side support. When the concave bin moves away from the storage box, the tilting discharge mechanism is used to tilt the concave bin and pour the received plastic particles into the screw conveyor.

[0010] As a further description of the above technical solution: the intermittent feeding mechanism includes a sliding seat arranged on a circular electric slide rail and a shelf fixed on the sliding seat, and the concave bin is movably arranged on the shelf;

[0011] The intermittent feeding mechanism also includes rack one and rack two slidably arranged on the sliding seat, and gear two rotatably arranged on the sliding seat, gear two is arranged between rack one and rack two and meshes with rack one and rack two at the same time, rack two is rotatably connected to the concave bin through a connecting frame, a pressure plate is arranged at the end of rack one, and the pressure plate is connected to the sliding seat through a spring column, and a traction plate is also arranged on the mounting bracket, and when the sliding seat moves close to the storage box, the pressure plate and the surface of the traction plate are pressed against each other.

[0012] As a further description of the above technical solution: the driving member is a circulating belt arranged on the mounting bracket, and a gear 1 is installed on the outer surface of the rotating shaft of the circulating belt close to the traction plate. When the traction plate contacts the pressure plate and moves to the maximum stroke, the gear 1 meshes with the teeth on the surface of the pressure plate.

[0013] As a further description of the above technical solution: the waste polymer plastic recovery device for chemical reuse also includes a vertical bar fixed on the side bracket, and when the traction plate contacts the pressure plate and moves to the maximum stroke, the vertical bar is used to limit the pressure plate.

[0014] As a further description of the above technical solution: the multifunctional board is arranged on the upper surface of the circulating belt, and the opening and closing mechanism is arranged on the lower surface of the circulating belt. When the gear 1 meshes with the teeth on the pressure plate and causes the circulating belt to rotate, the multifunctional board is inserted into the storage box to form an independent cavity below, and then the opening and closing mechanism is separated from the cover plate.

[0015] As a further description of the above technical solution: when the sliding seat moves along the annular electric slide rail to a position away from the storage box, the surface of the pressure plate abuts against the vertical bar, and gear one meshes with the teeth on the pressure plate again.

[0016] As a further description of the above technical solution: the opening and closing mechanism is slidably arranged on a mounting bracket and is connected to a sliding frame with a lower surface of the circulating belt, and the sliding frame is provided with a contact roller that contacts with the bottom surface of the cover plate.

[0017] As a further description of the above technical solution: a limit plate is also provided on the storage box body, and when the cover is opened, the limit plate is used to limit the opening angle of the cover.

[0018] As a further description of the above technical solution: the inclined material discharge mechanism includes a material guide plate 1 arranged on a side bracket and a material guide plate 2 arranged on the top side of the material guide plate 1 by rotating through a torsion spring, and an extension plate is arranged on the concave bin close to the screw conveying device side, and a groove is opened on the extension plate to match the material guide plate 1.

[0019] A method for recovering waste polymer plastics for chemical reuse, applied to the above-mentioned waste polymer plastics recovery device for chemical reuse, comprises the following steps:

[0020] Step 1: After pre-treatment, the waste polymer plastics are homogenized by a granulation device, and the polymer plastic particles after homogenization are temporarily stored in a storage box;

[0021] Step 2: Start the circular electric slide rail to make the intermittent feeding mechanism drive the concave bin to move in a circular motion;

[0022] Step 3: When the concave bin moves to a position close to the storage box, the intermittent feeding mechanism extends the concave bin toward the bottom of the storage box. At the same time, the intermittent feeding mechanism uses the driving member to separate the storage box with the multifunctional board, and then the opening and closing mechanism opens the cover plate, so that the plastic particles under the multifunctional board enter the concave bin;

[0023] Step 4: When the concave bin moves to a position away from the storage box, the plastic particles in the concave bin are dumped into the screw conveyor for high-speed conveying through the tilting discharge mechanism, and at the same time, the multi-function plate and the cover plate are restored to their initial positions through the intermittent feeding mechanism and the driving member.

[0024] In the above technical solution, the waste polymer plastic recycling device and method for chemical reuse provided by the present invention have the following beneficial effects:

[0025] 1. Through the design of the annular electric slide rail and intermittent feeding mechanism, the concave bin can accurately extend downward when approaching the storage box to receive the plastic particles and prevent them from spilling. This design ensures that the plastic particles can be efficiently and accurately transferred from the storage box to the concave bin, improving the overall conveying efficiency.

[0026] 2. Before the concave bin receives the plastic particles, the multifunctional board is first inserted into the storage box for separation, and then the opening and closing mechanism opens the cover plate, allowing the plastic particles under the multifunctional board to fall into the concave bin. This design effectively prevents excess plastic particles from being scattered all at once due to gravity, avoiding the problem of exceeding the bearing limit of the concave bin, and in the initial stage when the multifunctional board is opened outward to release the separation, that is, the stage when the cover plate begins to close after being resisted by the resistance roller, the blocking block delays the falling of the waste plastic particles until the cover plate is closed and the multifunctional board is away from the blocking block, and the plastic particles will fall, further preventing the problem of plastic particles falling. Moreover, when the cover plate is closed, the multifunctional board is still in a state of separation from the storage box, and at this time, there is no plastic particles filled between the multifunctional board and the cover plate, thereby reducing the closing pressure of the cover plate and improving the overall stability.

[0027] 3. By intermittently conveying plastic particles, continuous friction between the spiral blades and the material is avoided, and the conversion efficiency of mechanical energy to thermal energy is significantly reduced. This design not only reduces mechanical wear and extends the service life of the equipment, but also reduces energy consumption and improves energy utilization efficiency. The discontinuous material flow formed by intermittent conveying leaves a heat dissipation window for the conveying gap of the material in the spiral conveying device, so that the temperature gradient between the spiral trough and the particle surface can be quickly dissipated through air convection or an external cooling system. This is especially important for processing low-melting-point plastics or materials containing volatile components, which helps to keep the material within a suitable temperature range for conveying. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 Schematic diagram of the overall structure provided by an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of the partial structure provided by an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the partial structure from another angle provided by an embodiment of the present invention;

[0032] Figure 4 Schematic diagram of the partial structure from a third angle provided by an embodiment of the present invention;

[0033] Figure 5 Schematic diagram of the storage box body provided by an embodiment of the present invention;

[0034] Figure 6 Schematic diagram of the circulating feeding mechanism provided by an embodiment of the present invention;

[0035] Figure 7 Provided by an embodiment of the present invention Figure 6 Enlarged schematic diagram of part A;

[0036] Figure 8 Schematic diagram of the first guide plate and the second guide plate provided by an embodiment of the present invention;

[0037] Figure 9 Schematic diagram of the traction plate provided by an embodiment of the present invention;

[0038] Figure 10 Schematic diagram of the cross-section of the storage box body provided by an embodiment of the present invention.

[0039] Explanation of reference numerals:

[0040] 1. Mounting bracket; 2. Multifunctional plate; 3. Circulating belt; 31. First gear; 4. Pelletizing device; 5. Screw conveyor; 6. Ring-shaped electric slide rail; 61. Sliding seat; 62. Spring column; 63. Traction plate; 64. Pressure-receiving plate; 65. First rack; 66. Rack; 67. Concave bin; 68. Second gear; 69. Second rack; 610. Connecting frame; 7. Side vertical bracket; 8. Sliding frame; 81. Contact roller; 82. Limiting plate; 83. Cover plate; 9. Storage box body; 10. Vertical bar; 11. Guide plate; 12. Extension plate; 121. Notch; 122. First guide plate; 123. Second guide plate; 13. Blocking block. Detailed implementation manners

[0041] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] Please refer toFigures 1-9 The embodiment of the present invention provides a technical solution: a waste polymer plastic recycling device for chemical reuse, comprising a mounting bracket 1, and a granulator 4, a storage box 9 and a screw conveyor 5 arranged on the mounting bracket 1. The storage box 9 is used to temporarily store the plastic particles discharged by the granulator 4. When recycling the waste polymer plastic, the polymer plastic needs to be pre-treated first, and large pieces of plastic are processed into small pieces of plastic, and it needs to be cleaned to remove impurities. In order to further chemically treat the polymer plastic, it is necessary to use the granulator 4 to melt and granulate the plastic particles to ensure that the material is evenly heated during the subsequent chemical decomposition and improve the homogenization effect. After granulation, the homogenized plastic-grade particles enter the storage box 9 at the bottom through the discharge port of the granulator 4;

[0043] In order to convey the homogenized waste polymer plastics in the storage box 9 to the screw conveying device 5, so as to highly convey the waste plastic particles, thereby performing chemical cracking operations through the reactor, the waste polymer plastic recovery device for chemical reuse also includes: an annular electric slide rail 6 arranged on the side support 7, and a concave bin 67 is installed on the annular electric slide rail 6 through an intermittent feeding mechanism. When the annular electric slide rail 6 is in the starting state, the concave bin 67 is caused to rotate in a circular shape by the intermittent feeding mechanism and when it is close to the storage box 9, the concave bin 67 is extended to the bottom of the storage box 9 to receive the plastic particles. In this way, the intermittent feeding mechanism can be used to make the concave bin 67 extend to the bottom of the storage box 9 when it is close to the bottom of the storage box 9, so as to receive the plastic particles, thereby preventing the waste plastic particles from being scattered due to the gap between the storage box 9 and the concave bin 67;

[0044] In order to further improve the effect of conveying the waste plastic particles to the position of the screw conveying device 5, the waste polymer plastic recovery device for chemical reuse is also provided with a multifunctional plate 2 and an opening and closing mechanism on the mounting bracket 1 through a driving member, and the opening and closing mechanism is also provided with a cover plate 83 rotatably connected to the bottom opening of the storage box 9. When the concave bin 67 moves close to the storage box 9, the driving member is driven by the intermittent feeding mechanism to insert the multifunctional plate 2 into the storage box 9 to form a segmentation, and then the cover plate 83 is opened through the opening and closing mechanism to enable the concave bin 67 to receive the plastic particles below the multifunctional plate 2 after segmentation;

[0045] That is to say, before the concave bin 67 receives the waste plastic particles in the storage box 9, the driving member drives the multi-functional plate 2 to be inserted into the storage box 9 through the intermittent feeding mechanism. After the multi-functional plate 2 is inserted and separated, the cover plate 83 is opened through the opening and closing mechanism, so that the waste plastic particles under the multi-functional plate 2 fall into the concave bin 67 under the action of gravity, preventing the problem that excessive plastic particles fall and exceed the bearing limit of the concave bin 67, resulting in the spilling of plastic particles;

[0046] After the concave bin 67 receives the plastic particles, due to the continuous driving of the annular electric slide rail 6, the concave bin 67 moves away from the storage box 9. An inclined discharging mechanism is arranged between the concave bin 67 and the side support 7. When the concave bin 67 moves away from the storage box 9, the inclined discharging mechanism makes the concave bin 67 inclined and pours the received plastic particles into the feeding port of the screw conveyor 5. Then, the screw conveyor 5 transports the waste plastic particles at a high level and transports them to a cracking furnace or a reaction kettle for chemical cracking of the waste polymer plastics, so as to chemically reuse the polymer plastics;

[0047] In this way, with the continuous driving of the annular electric slide rail 6, the intermittent feeding mechanism drives the concave bin 67 to continuously rotate along the annular electric slide rail 6. Therefore, the waste plastic particles in the storage box 9 can be periodically transported to the screw conveyor 5 through the concave bin 67, and the waste plastic particles can be transported at a high level in stages through the screw conveyor 5. The waste plastic particles are put into the screw conveyor 5 in discrete batches, so that the material is distributed in a segmented manner in the spiral groove instead of being continuously filled, fundamentally reconstructing the material flow mode of the traditional screw conveyor. Its advantages are as follows: avoiding the continuous friction between the spiral blade and the material, significantly reducing the conversion efficiency of mechanical energy into heat energy, and leaving a heat dissipation window for the conveying gap of the material in the screw conveyor 5, so that the temperature gradient between the spiral trough body and the particle surface can be quickly dissipated through air convection or an external cooling system, especially suitable for processing low-melting plastics (such as LDPE) or materials containing volatile components; at the same time, the discontinuous material flow formed by intermittent conveying can reduce the fluctuation range of the spiral bearing load, reduce the mechanical fatigue caused by long-term full-load operation, extend the life of key components, and the entire intermittent feeding process of the waste plastic particles is automatic, reducing the demand for manpower and having a better use effect;

[0048] In an embodiment of the present invention, the intermittent feeding mechanism includes a sliding seat 61 arranged on the annular electric slide rail 6 and a frame 66 fixed on the sliding seat 61. The concave bin 67 is movably arranged on the frame 66. When the annular electric slide rail 6 is in the starting state, the sliding seat 61 arranged thereon can drive the frame 66 and the concave bin 67 to rotate in a cycle;

[0049] The intermittent feeding mechanism also includes a rack 1 65 and a rack 2 69 slidably arranged on the sliding seat 61, and a gear 2 68 rotatably arranged on the sliding seat 61. The gear 2 68 is arranged between the rack 1 65 and the rack 2 69 and meshes with the rack 1 65 and the rack 2 69 at the same time. The rack 2 69 is rotatably connected to the concave bin 67 through a connecting frame 610. A pressure plate 64 is arranged at the end of the rack 1 65, and the pressure plate 64 is connected to the sliding seat 61 through a spring column 62. A traction plate 63 is also arranged on the mounting bracket 1. When the sliding seat 61 moves close to the storage box 9, the pressure plate 64 abuts against the surface of the traction plate 63. Here, please refer to Figure 9 , which is a front view of the traction plate 63. When the sliding seat 61 rotates on the annular electric slide rail 6, when the pressure plate 64 abuts against the inclined surface portion of the traction plate 63 located above, the pressure plate 64 is compressed, the spring column 62 is compressed and deformed, and the pressure plate 64 pushes the rack 1 65 to move on the sliding seat 61, thereby pushing the concave groove to extend toward the bottom of the storage box 9 through the gear 2 68 and the rack 2 69, so as to receive the waste plastic particles in the storage box 9, and prevent the waste plastic particles from being scattered due to the gap between the storage box 9 and the concave bin 67;

[0050] In another embodiment of the present invention, the driving member is an endless belt 3 arranged on the mounting bracket 1, and a gear 31 is installed on the outer surface of the rotating shaft of the endless belt 3 near the traction plate 63. When the traction plate 63 contacts the pressure plate 64 and moves to the maximum stroke, that is, when the pressure plate 64 and the plane surface of the traction plate 63 contact each other, the gear 31 meshes with the teeth on the surface of the pressure plate 64. In this way, when the sliding seat 61 continues to move with the annular electric slide rail 6, the endless belt 3 can be rotated by the cooperation of the gear and the teeth on the surface of the pressure plate 64. The multi-function plate 2 is arranged on the upper surface of the endless belt 3, and the opening and closing mechanism is arranged on the endless belt 3. The lower surface of the endless belt 3, in this way, when the endless belt 3 rotates, the rotating endless belt 3 can make the multifunctional board 2 plug into the storage box 9 to separate the upper and lower spaces in the storage box 9. After the separation is formed, the cover plate 83 is opened by the opening and closing mechanism, so that the waste plastic particles under the multifunctional board 2 in the storage box 9 fall into the concave bin 67 under the action of gravity, so that the concave bin 67 can receive the waste plastic particles, and the storage box 9 is separated by the multifunctional board 2, so as to prevent a large amount of excess waste plastic particles from falling under the action of gravity and causing the problem of exceeding the bearing limit of the concave bin 67;

[0051] It should be noted here that since the pressure-receiving plate 64 and the sliding seat 61 are connected by a spring post 62, in order to improve the stability when the teeth on the pressure-receiving plate 64 mesh with the first gear 31, the waste polymer plastic recycling device for chemical reuse further includes a vertical bar 10 fixed to the side vertical bracket 7. When the traction plate 63 abuts against the pressure-receiving plate 64 and moves to the maximum stroke, the vertical bar 10 is used to limit the pressure-receiving plate 64. That is, when the pressure-receiving plate 64 is abutted by the traction plate 63 and the spring post 62 is compressed to the maximum stroke, the pressure-receiving plate 64 abuts against the vertical bar 10. At this time, under the abutting action of the plane surface of the traction plate 63 and the vertical bar 10, the pressure-receiving plate 64 is equivalent to being limited at this time, so that the teeth on the pressure-receiving plate 64 mesh with the first gear 31 more stably, preventing vibration;

[0052] After the concave bin 67 receives the waste plastic particles in the storage box 9 at the bottom of the multi-functional plate 2, it continues to move along the annular electric slide rail 6 under the drive of the sliding seat 61, so that the pressure-receiving plate 64 contacts the inclined surface below the traction plate 63, and the spring post 62 gradually recovers its deformation, so that the concave bin 67 returns to its initial position through the first rack 65, the second gear 68 and the second rack 69 on the pressure-receiving plate 64;

[0053] With the drive of the annular electric slide rail 6, the sliding seat 61 drives the concave bin 67 equipped with waste feed particles thereon to move along the annular electric slide rail 6. When it rotates to a position where the annular electric slide rail 6 is far away from the storage box 9, the surface of the pressure-receiving plate 64 abuts against the vertical bar 10, and the first gear 31 meshes with the teeth on the pressure-receiving plate 64 again. At this time, the circulating belt 3 rotates in the reverse direction, so that the multi-functional plate 2 and the cover plate 83 return to their initial positions. It should be noted here that in order to enable the concave bin 67 to extend towards the bottom of the storage box 9 to better receive the plastic particles, the teeth on the pressure-receiving plate 64 are staggered from the first gear 31 in the initial state. And it is exactly this staggered distance that allows the concave bin 67 to extend. And when the sliding seat 61 moves along the annular electric slide rail 6 to the side far away from the storage box 9, this staggered distance just fills the distance that the sliding seat 61 moves away from the storage box 9 along the annular electric slide rail 6, so that the teeth on the pressure-receiving plate 64 can just mesh with the first gear 31 to make the circulating belt 3 return to its initial position. Through the spatial pose matching of the mechanical components themselves, the synchronization of the telescopic movement of the concave bin 67 and the phase of the slide rail movement is realized, without relying on sensors or external power intervention, which not only simplifies the control system, but also ensures the accuracy and repeatability of the action through a pure mechanical self-feedback mechanism;

[0054] In another embodiment of the present invention, the opening and closing mechanism is slidably arranged on the mounting bracket 1 and the sliding frame 8 connected to the lower surface of the circulating belt 3, and the sliding frame 8 is provided with a resistance roller 81 that resists the bottom surface of the cover plate 83. In the stage of receiving the waste plastic particles in the storage box 9 through the concave bin 67, with the movement of the circulating belt 3, the multifunctional board 2 is gradually inserted into the storage box 9 to form a partition. At the same time, the sliding frame 8 drives the resistance roller 81 to move in the opposite direction of the multifunctional board 2. However, since the resistance roller 81 continuously resists the surface of the cover plate 83, the cover plate 83 will not be opened immediately, but only when the resistance roller 81 is completely separated from the cover plate 83, the cover plate 83 will be opened to release the waste plastic particles. This design is to prevent the problem that when the multifunctional board 2 does not completely separate the storage box 9, the cover plate 83 is opened, causing excess waste plastic to leak out;

[0055] When the circulating belt 3 moves in the reverse direction, the sliding frame 8 pushes the abutting roller 81 to directly abut against the bottom of the cover plate 83 again, and the cover plate 83 is directly closed by the thrust, and then the abutting roller 81 slides toward the end of the cover plate 83 under the drive of the circulating belt 3, and at this time, the multifunctional board 2 gradually unfolds, releasing the separation of the storage box 9, so that the waste plastic particles refill the bottom of the storage box 9, and in this reciprocating manner, the waste plastic particles can be continuously and intermittently transported;

[0056] The amount of each delivery is the waste plastic particles stored in the storage box 9 below the multi-function board 2, which effectively controls the delivery amount of the waste plastic particles each time. When the circulating belt 3 rotates in the reverse direction, the cover plate 83 can be quickly closed to prevent the waste plastic from falling out of the opening of the cover plate 83 after the multi-function board 2 is opened. In order to further optimize this problem, please refer to Figure 10 A blocking block 13 is also provided on the inner wall surface of the storage box 9. In the initial stage when the multifunctional board 2 is opened outward to release the separation, that is, the stage when the cover plate 83 begins to close after being resisted by the resisting roller 81, the blocking block 13 delays the falling of the waste plastic particles until the cover plate 83 is closed and the multifunctional board 2 is away from the blocking block 13. The plastic particles will then fall, further preventing the problem of the plastic particles falling. Moreover, when the cover plate 83 is closed, the multifunctional board 2 is still in a state of separating the storage box 9. At this time, there is no plastic particle filled between the multifunctional board 2 and the cover plate 83, thereby reducing the closing pressure of the cover plate 83 and improving the overall stability.

[0057] In another embodiment of the present invention, the inclined feeding mechanism includes a first guide plate 122 disposed on the side stand 7 and a second guide plate 123 rotatably disposed on the top side of the first guide plate 122 through a torsion spring. An extension plate 12 is provided on the concave bin 67 close to the side of the screw conveyor 5. A notch 121 adapted to the first guide plate 122 is formed on the extension plate 12. When the sliding seat 61 moves away from the storage box 9 along with the annular electric slide rail 6, the surface of the notch 121 of the extension plate 12 on the concave bin 67 abuts against the first guide plate 122. As the sliding seat 61 and the concave bin 67 continue to move upward, the concave bin 67 is gradually pressed and deflected, and its surface gradually abuts against the end of the second guide plate 123. At this time, the concave bin 67, the second guide plate 123 and the first guide plate 122 form a channel. When the concave bin 67 is gradually inclined, the waste plastic particles are poured out through this channel. A guide plate 11 is further provided between the side stand 7 and the feed inlet of the screw conveyor 5. The poured waste plastic particles enter the screw conveyor 5 along the guide plate 11 for height transportation until the concave bin 67 deflects to the maximum angle and then crosses the first guide plate 122 and the second guide plate 123, and the concave bin 67 returns to its original position. Then the concave bin 67 moves along with the annular electric slide rail 6, and so on, continuously and intermittently transporting the waste plastic particles in the storage box 9 to the position of the screw conveyor 5 for height transportation, and chemically cracking the waste plastic particles through the reaction kettle, so as to facilitate the subsequent treatment of the waste polymer plastics.

[0058] It should also be noted here that a limit plate 82 is further provided on the storage box 9. When the cover plate 83 is opened, the limit plate 82 is used to limit the opening angle of the cover plate 83 to prevent the opening angle from being too large and difficult to close.

[0059] The above-mentioned screw conveyor 5 and granulating device 4 are both prior arts and will not be elaborated here.

[0060] A method for recycling waste polymer plastics for chemical reuse, applied to the above-mentioned waste polymer plastic recycling device for chemical reuse, includes the following steps:

[0061] Step 1: Pretreat the waste polymer plastics and then perform homogenization treatment through the granulating device 4. The homogenized polymer plastic particles enter the storage box 9 for temporary storage;

[0062] Step 2: Start the annular electric slide rail 6 to make the intermittent feeding mechanism drive the concave bin 67 to move in a circle;

[0063] Step 3: When the concave bin 67 moves close to the storage box body 9, the intermittent feeding mechanism extends the concave bin 67 towards the bottom of the storage box body 9. Meanwhile, the intermittent feeding mechanism drives the multi-functional plate 2 to partition the storage box body 9 through the driving member, and then the opening and closing mechanism opens the cover plate 83, enabling the plastic particles below the multi-functional plate 2 to enter the concave bin 67;

[0064] Step 4: When the concave bin 67 moves away from the storage box body 9, the inclined discharging mechanism dumps the plastic particles in the concave bin 67 into the screw conveyor 5 for height transportation. Meanwhile, the intermittent feeding mechanism drives the multi-functional plate 2 and the cover plate 83 to return to their initial positions through the driving member again.

[0065] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. An apparatus for recycling waste polymer plastics for chemical reuse, comprising a mounting bracket (1), and a granulation device (4), a storage box (9) and a screw conveyor (5) provided on the mounting bracket (1), the storage box (9) being used for temporarily storing the plastic particles discharged by the granulation device (4), characterized in that, The waste polymer plastic recycling device for chemical reuse also includes: An annular electric slide rail (6) is arranged on the side support (7), and a concave bin (67) is installed on the annular electric slide rail (6) via an intermittent feeding mechanism. When the annular electric slide rail (6) is in a started state, the intermittent feeding mechanism causes the concave bin (67) to rotate in an annular shape and approach the storage box (9), so that the concave bin (67) extends toward the bottom of the storage box (9) to receive the plastic particles. The multifunctional board (2) and the opening and closing mechanism are arranged on the mounting bracket (1) by means of a driving member, and the opening and closing mechanism is further provided with a cover plate (83) rotatably connected to the bottom opening of the storage box (9); when the concave bin (67) moves close to the storage box (9), the driving member is driven by the intermittent feeding mechanism to insert the multifunctional board (2) into the storage box (9) to form a segmentation, and the cover plate (83) is opened by means of the opening and closing mechanism to enable the concave bin (67) to receive the plastic particles below the segmented multifunctional board (2); The tilting discharge mechanism is arranged between the concave bin (67) and the side support (7). When the concave bin (67) moves away from the storage box (9), the tilting discharge mechanism causes the concave bin (67) to tilt and pour the received plastic particles into the screw conveying device (5).

2. The waste polymer plastic recycling device for chemical reuse according to claim 1, wherein The intermittent feeding mechanism comprises a sliding seat (61) arranged on an annular electric slide rail (6) and a shelf (66) fixedly mounted on the sliding seat (61); the concave bin (67) is movably mounted on the shelf (66); The intermittent feeding mechanism further comprises a rack 1 (65) and a rack 2 (69) slidably arranged on the sliding seat (61), and a gear 2 (68) rotatably arranged on the sliding seat (61); the gear 2 (68) is arranged between the rack 1 (65) and the rack 2 (69) and meshes with the rack 1 (65) and the rack 2 (69) at the same time; the rack 2 (69) is rotatably connected to the concave bin (67) through a connecting frame (610); a pressure plate (64) is arranged at the end of the rack 1 (65), and the pressure plate (64) is connected to the sliding seat (61) through a spring column (62); a traction plate (63) is also arranged on the mounting bracket (1); when the sliding seat (61) moves close to the storage box (9), the pressure plate (64) and the traction plate (63) are abutted against each other.

3. The waste polymer plastic recycling device for chemical reuse according to claim 2, wherein, The driving member is a circulating belt (3) arranged on the mounting bracket (1), and a gear 1 (31) is installed on the outer surface of the rotating shaft of the circulating belt (3) near the traction plate (63). When the traction plate (63) contacts the pressure plate (64) and moves to a maximum stroke, the gear 1 (31) meshes with the teeth on the surface of the pressure plate (64).

4. The waste polymer plastic recycling device for chemical reuse according to claim 3, wherein The waste polymer plastic recycling device for chemical reuse further comprises a vertical bar (10) fixed to the side support (7), and when the traction plate (63) contacts the pressure plate (64) and moves to a maximum stroke, the vertical bar (10) is used to limit the pressure plate (64).

5. The waste polymer plastic recycling device for chemical reuse according to claim 4, characterized in that, The multifunctional plate (2) is arranged on the upper surface of the circulating belt (3), and the opening and closing mechanism is arranged on the lower surface of the circulating belt (3). When the first gear (31) meshes with the teeth on the pressure receiving plate (64) and rotates the circulating belt (3), after the multifunctional plate (2) is inserted into the storage box body (9) to form an independent cavity below, the opening and closing mechanism is separated from the cover plate (83).

6. The waste polymer plastic recycling device for chemical reuse according to claim 5, characterized in that, When the sliding seat (61) moves along the annular electric slide rail (6) to a position away from the storage box body (9), the surface of the pressure receiving plate (64) abuts against the vertical bar (10), and the first gear (31) meshes with the teeth on the pressure receiving plate (64) again.

7. The waste polymer plastic recycling device for chemical reuse according to claim 6, characterized in that, The opening and closing mechanism is slidably arranged on the mounting bracket (1) and is connected to the sliding frame (8) on the lower surface of the circulating belt (3). The sliding frame (8) is provided with a contact roller (81) that abuts against the bottom surface of the cover plate (83).

8. The waste polymer plastic recycling device for chemical reuse according to claim 7, characterized in that, A limiting plate (82) is further arranged on the storage box body (9). When the cover plate (83) is opened, the limiting plate (82) is used to limit the opening angle of the cover plate (83).

9. The waste polymer plastic recycling device for chemical reuse according to claim 8, wherein, The inclined feeding mechanism includes a first guide plate (122) arranged on the side vertical bracket (7) and a second guide plate (123) rotatably arranged on the top side of the first guide plate (122) through a torsion spring. An extension plate (12) is arranged on the side of the concave bin (67) close to the screw conveyor device (5). A notch (121) adapted to the first guide plate (122) is formed on the extension plate (12).

10. A method for recycling waste polymer plastics for chemical reuse, which is applied to the waste polymer plastic recycling device for chemical reuse according to any one of claims 1 to 9, characterized in that, It includes the following steps: Step 1: The waste polymer plastics are pretreated and then homogenized by the granulating device (4). The polymer plastic particles after homogenization enter the storage box body (9) for temporary storage. Step 2: Start the annular electric slide rail (6) to make the intermittent feeding mechanism drive the concave bin (67) to move in a circle. Step 3: When the concave bin (67) moves to a position close to the storage box body (9), the intermittent feeding mechanism makes the concave bin (67) extend towards the bottom of the storage box body (9). At the same time, the intermittent feeding mechanism separates the storage box body (9) through the driving member by the multifunctional plate (2), and then the opening and closing mechanism opens the cover plate (83), so that the plastic particles below the multifunctional plate (2) enter the concave bin (67). Step 4: When the concave bin (67) moves to a position away from the storage box body (9), the inclined feeding mechanism makes the plastic particles in the concave bin (67) pour into the screw conveyor device (5) for high-level transportation. At the same time, the intermittent feeding mechanism makes the multifunctional plate (2) and the cover plate (83) return to their initial positions through the driving member again.

Images