Waste heat recycling device for waste plastic particle processing

Abstract

The invention relates to the technical field of plastic particle processing, in particular to a waste heat recycling device for waste plastic particle processing, which comprises a bottom frame, an extruder, a feeding pipe I, a cooling tank and the like, the bottom frame is fixedly connected with an extruder and a cooling pool; the extruder is communicated with a first feeding pipe. Hot air flows from right to left and is blown to plastic particles which slide down subsequently to preheat the plastic particles, in the process, the hot air preheats the plastic particles needing a high preheating temperature on the right filter screen, and after preheating, the temperature of the hot air is reduced, so that the plastic particles are preheated; and then the plastic particles needing low preheating temperature on the left filter screen are preheated, so that preheating of two different plastics is met at the same time, and the plastic particles needing low preheating temperature are prevented from being directly preheated by high-temperature hot air.

Description

Technical Field

[0001] The present application relates to the technical field of plastic particle processing, and in particular to a waste heat recovery and utilization device for processing waste plastic particles. Background Art

[0002] Plastic granulation is the core link of waste plastic resource utilization. Through melt blending, extrusion molding and cooling granulation, plastics with complex components are recycled into high-purity granules. In traditional granulation systems, a centralized heat source is generally used to uniformly preheat plastic granules, which are then melted and extruded into strips by an extruder, and then solidified by a cooling medium (water cooling / air cooling) and cut into granules; although the prior art has tried to use the waste heat of the extrusion process to preheat the granules to reduce energy consumption, such as the Chinese patent: CN115447107A, a plastic extrusion device with heat recovery function, which can recover the heat emitted from the extrusion die through the waste heat recovery mechanism and transport it to the preheating pipe through the ventilation pipe and air pump. The plastic raw materials that are about to enter the extruder body are preheated and dried, thereby realizing the effective recovery and utilization of heat energy, reducing energy consumption and lowering production costs; however, the current devices are mostly adapted to single materials or homogeneous mixtures. When dealing with the coordinated processing of heterogeneous plastics (such as polyethylene (PE) and polyvinyl chloride (PVC) with significant differences in heat resistance), the lack of a graded temperature control mechanism leads to insufficient process adaptability; that is, when high-temperature-resistant plastic particles (PE) and heat-sensitive plastic particles (PVC) share the heat dissipated from the extrusion die, the heat dissipated from the extrusion die will cause the heat-sensitive plastic particles (PVC) to undergo thermal decomposition, releasing toxic gases such as hydrogen chloride, while softening adhesion, affecting continuous processing. Summary of the invention

[0003] In order to overcome the disadvantage that when high temperature resistant plastic particles (PE) and heat sensitive plastic particles (PVC) share the heat emitted from the extrusion die, the heat emitted from the extrusion die will cause the heat sensitive plastic particles (PVC) to undergo thermal decomposition, release toxic gases such as hydrogen chloride, and soften and adhere to each other, thus affecting continuous processing, the present invention provides a waste heat recovery and utilization device for processing waste plastic particles.

[0004] The technical scheme of the present invention is: a waste heat recovery and utilization device for processing waste plastic particles, comprising a base frame, an extruder, a feed pipe 1 and a cooling pool; the base frame is fixedly connected with the extruder and the cooling pool; the extruder is connected with the feed pipe 1; it also comprises an arc plate, an L-shaped air duct, an exhaust fan, a hopper, a partition, a feed pipe 2 and a filter; the extruder is fixedly connected with an arc plate at the extrusion port; the arc plate is connected with the L-shaped air duct, and the L-shaped air duct is fixed to the base frame through a bracket; the feed pipe 1 is connected with the L-shaped air duct, and the feed pipe 1 is close to the air outlet of the L-shaped air duct; the L-shaped An exhaust fan is fixedly connected in the air duct; the L-shaped air duct is connected to two feeding pipes 2; the two feeding pipes 2 are respectively fixedly connected with a filter screen, the filter screen is located in the L-shaped air duct, the filter screen is inclined, the filter screen is fixed to the L-shaped air duct, and the ends of the two filters away from the feeding pipe 2 are both located directly above the feeding pipe 1; the ends of the two feeding pipes 2 that are not provided with the filter screen are commonly connected to a hopper, and the hopper is fixed to the base frame through a bracket; a partition is fixedly connected to the middle part of the hopper, the partition divides the space in the hopper into two parts, and the two feeding pipes 2 are respectively connected to the corresponding spaces in the hopper.

[0005] Furthermore, the filter screen has an inclination angle of 30°-45°.

[0006] Furthermore, the filter screen is provided with a plurality of staggered convex strips.

[0007] Furthermore, the length of the convex strips on the filter screen gradually decreases from top to bottom.

[0008] Furthermore, it also includes a temperature detector and an electric heating rod; the temperature detector is fixedly connected to the L-shaped air duct; the temperature detector is located between the exhaust fan and the filter; a plurality of electric heating rods are fixedly connected to the L-shaped air duct; the electric heating rod is close to the air inlet of the L-shaped air duct, and the exhaust fan is located between the temperature detector and the electric heating rod.

[0009] Furthermore, it also includes a temperature detector 2, a baffle and an electric push rod; the temperature detector 2 is fixedly connected to the L-shaped air duct; the temperature detector 2 is located between the two feeding pipes 2; a baffle is respectively inserted into the two feeding pipes 2; an electric push rod is respectively fixedly connected to the two feeding pipes 2; the telescopic ends of the two electric push rods are respectively fixedly connected to the corresponding baffles.

[0010] Furthermore, it also includes a conical ring; the conical ring is fixedly connected to the L-shaped air duct; the conical ring is located between the two filter screens, and the larger opening of the conical ring faces the filter screen on the right.

[0011] Furthermore, it also includes a connecting rod, an air disk, an elastic sheet, a limit ring and a pull rope; the inside of the L-shaped air duct is slidably connected to the connecting rod through a connecting plate; the end of the connecting rod away from the filter is fixedly connected to the air disk, and the air disk is directly opposite to the middle of the filter; the end of the connecting rod facing the filter is fixedly connected to the pull rope; the pull rope is fixedly connected to the middle of the adjacent filter, and the filter is elastic; an elastic sheet is fixedly connected to the connecting rod; a limit ring is fixedly connected to the inside of the L-shaped air duct, the elastic sheet is in contact with the limit ring, the diameter of the elastic sheet is larger than the inner diameter of the limit ring, and the inner surface of the limit ring is set to be smooth.

[0012] Furthermore, it also includes a V-shaped cylinder; the V-shaped cylinder is fixedly connected in the L-shaped air duct; the right part of the V-shaped cylinder is perpendicular to the filter screen on the left; and the pull rope passes through the V-shaped cylinder.

[0013] Furthermore, the inside of the V-shaped cylinder is arranged to be smooth.

[0014] The beneficial effects are as follows: 1. The present invention preheats the plastic particles by blowing hot air from right to left onto the plastic particles that slide down subsequently. In this process, the hot air first preheats the plastic particles on the right filter screen that require a higher preheating temperature. After preheating, the temperature of the hot air decreases, and then the plastic particles on the left filter screen that require a lower preheating temperature are preheated. In this way, the preheating of two different plastics is met at the same time, and it is avoided that the plastic particles that require a lower preheating temperature are directly preheated by the high-temperature hot air, resulting in the softening and decomposition of the plastic particles (such as PVC) that require a lower preheating temperature, generating toxic gases to pollute the environment, and avoiding the increase in viscosity of the softened plastic particles, which is easy to clog the filter screen and affect continuous production.

[0015] 2. In the present invention, the hot air will lose some heat before flowing to the filter, which may result in insufficient heat to preheat the plastic particles that require a higher preheating temperature; the temperature of the hot air is monitored by a temperature detector 1. When it is monitored that the temperature of the hot air is insufficient to preheat the plastic particles that require a higher preheating temperature, in order to ensure the preheating effect on the plastic particles and accelerate the mixing and melting rate of the plastic particles, the temperature detector 1 controls the electric heating rod to energize it to generate heat, thereby heating the air to meet the preheating temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the waste heat recovery and utilization device for processing waste plastic particles of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the exhaust fan and the electric heating rod of the waste heat recovery and utilization device for processing waste plastic particles of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the feed pipe 2, the filter screen and the temperature detector 1 of the waste heat recovery and utilization device for processing waste plastic particles of the present invention; Figure 4 It is a schematic diagram of the second three-dimensional structure of the temperature detector of the waste heat recovery and utilization device for processing waste plastic particles of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the connecting rod, wind disc, elastic sheet, limiting ring and pull rope of the waste heat recovery and utilization device for processing waste plastic particles of the present invention; Figure 6 This is a diagram showing the movement state of the elastic sheet of the waste heat recovery and utilization device for processing waste plastic particles of the present invention.

[0017] The names and serial numbers of the parts in the figure are: 1-base, 2-extruder, 3-feeding pipe 1, 4-cooling pool, 5-arc plate, 6-L-shaped air duct, 7-exhaust fan, 8-hopper, 9-partition, 10-feeding pipe 2, 11-filter, 12-temperature detector 1, 13-electric heating rod, 14-temperature detector 2, 15-baffle, 16-electric push rod, 21-conical ring, 22-connecting rod, 23-wind disc, 24-elastic sheet, 25-limiting ring, 26-pull rope, 31-V-shaped cylinder. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Embodiment 1: A waste heat recovery device for processing waste plastic particles, such as Figure 1-Figure 4 As shown, it includes a base frame 1, an extruder 2, a feed pipe 3 and a cooling pool 4; the extruder 2 and the cooling pool 4 are fixedly connected to the base frame 1, and the cooling pool 4 is located at the extrusion port of the extruder 2; the extruder 2 is connected to the feed pipe 3; It also includes an arc plate 5, an L-shaped air duct 6, an exhaust fan 7, a hopper 8, a partition 9, a feed pipe 2 10 and a filter 11; the extrusion port of the extruder 2 is fixedly connected with an arc plate 5; the arc plate 5 is connected with an L-shaped air duct 6, and the L-shaped air duct 6 is fixed to the base frame 1 through a bracket; the feed pipe 1 3 is connected with the L-shaped air duct 6, and the feed pipe 1 3 is close to the air outlet of the L-shaped air duct 6; the exhaust fan 7 is fixedly connected in the L-shaped air duct 6; the L-shaped air duct 6 is connected with two feed pipes 2 10; the two feed pipes 2 10 are respectively fixed with a filter 11, the filter screen 11 is located in the L-shaped air duct 6, the filter screen 11 is inclined, the filter screen 11 is fixedly connected to the L-shaped air duct 6, and the ends of the two filter screens 11 away from the feeding pipe 10 are both located directly above the feeding pipe 1 3; the ends of the two feeding pipes 10 that are not provided with the filter screen 11 are commonly connected to a hopper 8, and the hopper 8 is fixed to the base frame 1 through a bracket; a partition plate 9 is welded in the middle of the hopper 8, and the partition plate 9 divides the space in the hopper 8 into two parts, and the two feeding pipes 10 are respectively connected to the corresponding spaces in the hopper 8.

[0020] In order to prevent the plastic particles from falling too fast and to ensure the preheating effect of the hot air on the plastic particles, the filter screen 11 is inclined at an angle of 30°-45°.

[0021] In order to slow down the falling speed of the plastic particles and increase the preheating time, the filter screen 11 is provided with a plurality of staggered convex strips.

[0022] As the plastic particles slide down the inclined filter screen 11, their potential energy gradually decreases. To prevent the convex strips at the end of the filter screen 11 from intercepting the plastic particles and causing the filter screen 11 to be blocked, the length of the convex strips on the filter screen 11 gradually decreases from top to bottom.

[0023] It also includes a temperature detector 12 and an electric heating rod 13; the temperature detector 12 is fixedly connected to the L-shaped air duct 6; the temperature detector 12 is located between the exhaust fan 7 and the filter 11; three electric heating rods 13 are fixedly connected to the L-shaped air duct 6; the electric heating rod 13 is close to the air inlet of the L-shaped air duct 6, and the exhaust fan 7 is located between the temperature detector 12 and the electric heating rod 13.

[0024] It also includes a temperature detector 14, a baffle 15 and an electric push rod 16; the temperature detector 14 is fixedly connected to the L-shaped air duct 6; the temperature detector 14 is located between the two feeding pipes 10; a baffle 15 is respectively inserted into the two feeding pipes 10; an electric push rod 16 is respectively fixedly connected to the two feeding pipes 10; the telescopic ends of the two electric push rods 16 are respectively fixedly connected to the corresponding baffles 15.

[0025] by Figure 1 Taking the viewing angle as the reference, the side where the feed pipe 3 is located is the left side, and the side where the arc plate 5 is located is the right side.

[0026] Before work, cooling water is first injected into the cooling pool 4, and a plastic granulator is set on the right side of the cooling pool 4; when two kinds of plastic granules (polyethylene (PE) and polyvinyl chloride (PVC)) are processed at the same time, the two kinds of plastic granules are first poured into the left and right parts of the hopper 8 respectively, and the plastic granules requiring a higher preheating temperature are located in the right part of the hopper 8. The plastic granules fall into the extruder 2 through the feed pipe 10, the filter screen 11 and the feed pipe 3 in turn. The extruder 2 mixes and melts the two injected plastic granules, and then extrude them into strips. The plastic strips are discharged from the extrusion port on the right side of the extruder 2. During the initial work, the plastic strips are manually pulled out and immersed in the cooling pool 4, and then introduced into the plastic granulator; in this way, during continuous work, the plastic strips are continuously pulled to the right by the plastic granulator, and the cooled plastic strips are pelletized to complete the granulation of plastic particles.

[0027] When the extruder 2 works to mix and extrude the two injected plastic particles into strips, a large amount of heat will be emitted from the extrusion port. Therefore, during the extrusion operation, the exhaust fan 7 is controlled to start the exhaust operation, so that the horizontal and vertical parts of the L-shaped air duct 6 generate wind from right to left, and the vertical part of the L-shaped air duct 6 will draw in the heat around the extrusion port, making the wind into hot air. The arc plate 5 arranged above the extrusion port can limit the heat to facilitate the vertical part of the L-shaped air duct 6 to draw; the hot air flows from right to left and blows on the plastic particles that slide down later to preheat the plastic particles. In this process, the hot air first preheats the plastic particles on the right filter screen 11 that need a higher preheating temperature. Heat, after preheating, the temperature of the hot air decreases, and then the plastic particles on the left filter 11 that require a lower preheating temperature are preheated, so that the preheating of two different plastics is satisfied at the same time, and the plastic particles that require a lower preheating temperature are avoided to be directly preheated by high-temperature hot air, resulting in the softening and decomposition of plastic particles (such as PVC) that require a lower preheating temperature, and the generation of toxic gases to pollute the environment, and the viscosity of the softened plastic particles is avoided to increase, which is easy to clog the filter 11 and affect continuous production; it should be noted that in order to slow down the falling speed of the plastic particles, increase the preheating time, and ensure the preheating efficiency, a plurality of staggered convex strips are arranged on the inclined filter 11.

[0028] Before the hot air flows to the filter 11, it will lose some heat, which may result in insufficient heat to preheat the plastic particles that require a higher preheating temperature; therefore, the temperature of the hot air is monitored by a temperature detector 12. When it is monitored that the temperature of the hot air is insufficient to preheat the plastic particles that require a higher preheating temperature, in order to ensure the preheating effect of the plastic particles and accelerate the mixing and melting rate of the plastic particles, the temperature detector 12 controls the electric heating rod 13 to energize it to generate heat, thereby heating the air to meet the preheating temperature.

[0029] Baffles 15 are inserted into both feeding pipes 10. When feeding, the baffles 15 are pushed by the electric push rod 16 to prevent the feeding pipe 10 from being blocked, and the plastic particles are discharged normally through the feeding pipe 10. The feeding amount of the plastic particles can be controlled by the movement degree of the baffles 15 pushed by the electric push rod 16, that is, the degree to which the baffles 15 block the feeding pipe 10. It should be noted that the temperature of the hot air passing through the right filter 11 is monitored by the temperature detector 14. When it is detected that the temperature of the hot air will cause the plastic particles (such as PVC) that require a lower preheating temperature to soften and decompose, the right baffle 15 can be pushed by the electric push rod 16, so that more plastic particles fall from the right feeding pipe 10 to the right filter 11, so that the hot air needs to preheat more plastic particles, and the temperature of the hot air will also drop lower, thereby avoiding the hot air causing the plastic particles (such as PVC) that require a lower preheating temperature to soften and decompose.

[0030] It should be noted that when only one type of plastic particles is to be processed, the plastic particles can be poured into the right part of the hopper 8. If PVC plastic particles are to be processed, when the temperature detector 12 detects that the temperature of the hot air will cause the PVC plastic particles to soften and decompose, the temperature detector 12 controls the right electric push rod 16 to push the corresponding baffle 15, so that the degree of blocking of the right baffle 15 on the right feed pipe 10 is reduced, so that more plastic particles pass through the right filter 11 per unit time, so that the hot air needs to preheat more plastic particles, and the heat obtained by a single plastic particle will also be reduced, thereby avoiding the softening and decomposition of plastic particles (such as PVC) that require a lower preheating temperature due to hot air.

[0031] Embodiment 2: Based on embodiment 1, Figure 3-Figure 6 As shown, a conical ring 21 is also included; the conical ring 21 is fixedly connected to the L-shaped air duct 6; the conical ring 21 is located between the two filter screens 11, and the larger opening of the conical ring 21 faces the filter screen 11 on the right.

[0032] It also includes a connecting rod 22, an air disk 23, an elastic sheet 24, a limiting ring 25 and a pull rope 26; the inside of the L-shaped air duct 6 is slidably connected to the connecting rod 22 through a connecting plate; the end of the connecting rod 22 away from the filter 11 is fixedly connected to the air disk 23, and the air disk 23 is directly opposite to the middle of the filter 11; the end of the connecting rod 22 facing the filter 11 is fixedly connected to the pull rope 26; the pull rope 26 is fixedly connected to the middle of the adjacent filter 11, and the filter 11 is elastic; an elastic sheet 24 is fixedly connected to the connecting rod 22; the limiting ring 25 is fixedly connected to the inside of the L-shaped air duct 6, the elastic sheet 24 is in contact with the limiting ring 25, the diameter of the elastic sheet 24 is larger than the inner diameter of the limiting ring 25, in order to reduce the friction between the elastic sheet 24 and the inner surface of the limiting ring 25, the inner surface of the limiting ring 25 is set to be smooth.

[0033] It also includes a V-shaped cylinder 31 ; the V-shaped cylinder 31 is fixedly connected to the L-shaped air duct 6 ; the right part of the V-shaped cylinder 31 is perpendicular to the filter screen 11 on the left; and the pull rope 26 passes through the V-shaped cylinder 31 .

[0034] In order to facilitate the sliding of the pull rope 26 in the V-shaped tube 31, the inside of the V-shaped tube 31 is smooth.

[0035] In the process of making waste plastic into plastic pellets, it will go through a cleaning process to remove the dust in the plastic pellets. However, during the subsequent transfer, the dust is easily attached to the plastic pellets due to static electricity. The presence of dust will affect the product quality (dust residue will cause bubbles, surface defects and other problems in injection molded products). For this reason, when the hot air flows from right to left and blows down the sliding plastic pellets to preheat the plastic pellets, the hot air can blow away the dust on the plastic pellets to improve product quality. Specifically: hot air can accelerate the dissipation of charge, reduce static adsorption, weaken the adsorption force, make the dust easier to detach, and the efficiency is significantly higher than that of normal temperature air. However, during the preheating process, the dust on the right plastic pellets will migrate to the left plastic pellets with the hot air, resulting in the left The dust on the plastic particles increases, and there is a phenomenon that the dust is not completely blown away; therefore, a conical ring 21 is arranged between the two filter screens 11, and the larger opening of the conical ring 21 faces the filter screen 11 on the right. According to the Bernoulli principle, after the hot air passes through the conical ring 21, the flow rate increases, and the hot air blows to the filter screen 11 on the left at a faster speed, which significantly improves the dust removal efficiency of the particles with low temperature requirements; the left part of the L-shaped air duct 6 is connected to the external dust removal equipment through a hose in advance, and the dust blown out is filtered by the external dust removal equipment to avoid polluting the environment; it should be noted that the several staggered convex strips arranged on the filter screen 11 slow down the falling speed of the plastic particles, so that there is enough time for the wind to blow away the dust on the plastic particles.

[0036] Furthermore, the filter screen 11 is configured to be elastic. When plastic particles fall from the feed pipe 10 onto the filter screen 11, the filter screen 11 is forced to vibrate, thereby preventing the plastic particles from being caught by the convex strips on the filter screen 11 and affecting the blocking effect on subsequent plastic particles.

[0037] It is taken into consideration that after the hot air blows toward the left filter 11 at a faster speed, there is a problem that the plastic particles are embedded in the middle of the filter 11, causing the middle of the filter 11 to be blocked, affecting subsequent operations; therefore, the left filter 11 is set to be elastic. When the hot air blows from right to left, it will drive the wind disc 23 to move to the left, and the wind disc 23 will drive the connecting rod 22, the elastic sheet 24 and the pull rope 26 to move to the left. The pull rope 26 moves to the left and pulls the left filter 11, causing the left filter 11 to deform and accumulate force. The elastic sheet 24 moves to the left and deforms through the limit ring 25, and returns to its original state after coming out of the limit ring 25. Finally, when the elastic sheet 24 contacts the right side of the limit ring 25, as shown in FIG. Figure 6 As shown; as the middle part of the filter 11 is gradually blocked, the hot air blowing to the wind disk 23 gradually decreases, and the leftward pulling force of the wind disk 23 on the connecting rod 22, the elastic sheet 24 and the pull rope 26 becomes smaller. When the leftward pulling force is less than the elastic force of the left filter 11, the elastic sheet 24 is deformed again and passes through the limit ring 25, and the left filter 11 rebounds quickly to restore. When rebounding, the plastic particles embedded in the middle part of the filter 11 are bounced up, thereby automatically clearing the left filter 11 to avoid affecting subsequent operations.

[0038] In addition, the movement of the pull rope 26 is limited by the V-shaped cylinder 31, and the right part of the V-shaped cylinder 31 is perpendicular to the left filter 11. In this way, when the pull rope 26 moves to the left to pull the left filter 11, the left filter 11 can be pulled to the maximum extent, so that the force stored in the left filter 11 is large enough, thereby generating a greater rebound and improving the dredging effect.

[0039] The above is a detailed introduction to the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A waste heat recovery device for processing waste plastic particles, comprising a base frame (1), an extruder (2), a feed pipe (3) and a cooling pool (4); the base frame (1) is fixedly connected with the extruder (2) and the cooling pool (4); the extruder (2) is connected with the feed pipe (3); the characteristics are: The invention also comprises an arc-shaped plate (5), an L-shaped air duct (6), an exhaust fan (7), a hopper (8), a partition plate (9), a second feed pipe (10) and a filter screen (11); the arc-shaped plate (5) is fixedly connected to the extrusion port of the extruder (2); the arc-shaped plate (5) is connected to the L-shaped air duct (6), and the L-shaped air duct (6) is fixed to the base frame (1) through a bracket; the first feed pipe (3) is connected to the L-shaped air duct (6), and the first feed pipe (3) is close to the air outlet of the L-shaped air duct (6); the exhaust fan (7) is fixedly connected inside the L-shaped air duct (6); the L-shaped air duct (6) is connected to two second feed pipes (10); the two second feed pipes (10) are respectively fixedly connected to one A filter screen (11) is disposed in the L-shaped air duct (6). The filter screen (11) is inclined and fixedly connected to the L-shaped air duct (6). The ends of the two filter screens (11) that are away from the second inlet pipe (10) are both located directly above the first inlet pipe (3). The ends of the two second inlet pipes (10) that are not provided with the filter screen (11) are connected to a hopper (8) in common. The hopper (8) is fixed to the base frame (1) through a bracket. A partition plate (9) is fixedly connected to the middle of the hopper (8). The partition plate (9) divides the space in the hopper (8) into two parts. The two second inlet pipes (10) are respectively connected to the corresponding spaces in the hopper (8).

2. The waste heat recovery device for processing waste plastic particles according to claim 1 is characterized in that: The filter screen (11) has an inclination angle of 30°-45°.

3. The waste heat recovery device for processing waste plastic particles according to claim 2 is characterized in that: The filter screen (11) is provided with a plurality of staggered convex strips.

4. The waste heat recovery device for processing waste plastic particles according to claim 3 is characterized in that: The length of the convex strips on the filter screen (11) gradually decreases from top to bottom.

5. The waste heat recovery device for processing waste plastic particles according to claim 1 is characterized in that: It also includes a temperature detector (12) connected to the L-shaped air duct (6); the temperature detector (12) is located between the exhaust fan (7) and the filter (11); a plurality of electric heating rods (13) are fixedly connected to the L-shaped air duct (6); the electric heating rods (13) are close to the air inlet of the L-shaped air duct (6), and the exhaust fan (7) is located between the temperature detector (12) and the electric heating rods (13).

6. The waste heat recovery device for processing waste plastic particles according to claim 5 is characterized in that: It also includes a second temperature detector (14) connected to the L-shaped air duct (6); the second temperature detector (14) is located between the two second material inlet pipes (10); a baffle (15) is respectively inserted into the two second material inlet pipes (10); an electric push rod (16) is respectively fixedly connected to the two second material inlet pipes (10); and the telescopic ends of the two electric push rods (16) are respectively fixedly connected to the corresponding baffles (15).

7. The waste heat recovery device for processing waste plastic particles according to claim 6 is characterized in that: It also includes a conical ring (21) connected to the L-shaped air duct (6); the conical ring (21) is located between the two filter screens (11), and the larger opening of the conical ring (21) faces the filter screen (11) on the right.

8. The waste heat recovery device for processing waste plastic particles according to claim 7 is characterized in that: It also includes a connecting rod (22) connected to the L-shaped air duct (6); an end of the connecting rod (22) away from the filter (11) is fixedly connected to a wind disk (23), and the wind disk (23) is directly opposite to the middle of the filter (11); an end of the connecting rod (22) facing the filter (11) is fixedly connected to a pull rope (26); the pull rope (26) is fixedly connected to the middle of the adjacent filter (11), and the filter (11) is elastic; an elastic sheet (24) is fixedly connected to the connecting rod (22); a limit ring (25) is fixedly connected to the L-shaped air duct (6), the elastic sheet (24) is in contact with the limit ring (25), the diameter of the elastic sheet (24) is larger than the inner diameter of the limit ring (25), and the inner surface of the limit ring (25) is smooth.

9. The waste heat recovery device for processing waste plastic particles according to claim 8, characterized in that: It also includes a V-shaped cylinder (31) connected to the L-shaped air duct (6); one end of the V-shaped cylinder (31) away from the pull rope (26) is perpendicular to the filter screen (11) adjacent to it; and the pull rope (26) passes through the V-shaped cylinder (31).

10. The waste heat recovery device for processing waste plastic particles according to claim 9, characterized in that: The V-shaped cylinder (31) is provided with a smooth interior.

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