A medical plastic particle airflow drying device

Abstract

This invention discloses an airflow drying device for medical plastic particles, belonging to the field of plastic processing. It includes a housing with an exhaust port and a discharge port; a material box is fixedly inserted into the top of the housing; a support is fixedly installed inside the housing, and a hollow conduit with an open top is vertically and rotatably mounted on the support. The top of the conduit is rotatably sleeved outside the output end of the material box, and a motor for driving the conduit to rotate is provided inside the housing; multiple annular support plates are fixedly sleeved at intervals on the outer surface of the conduit. This design, by setting guide blocks with gradually decreasing inner diameters and through holes inside the conduit, can divide large quantities of material layer by layer from top to bottom and evenly spread them on the surface of each support plate, preventing excessive accumulation of single-layer material. Simultaneously, the high-temperature hot air blown upwards by the bottom aeration plate and the impact force of the mesh disperse the static plastic particle layer, increasing the contact area between the material and the hot airflow, allowing moisture to evaporate rapidly and improving drying efficiency.

Description

Technical Field

[0001] This invention relates to the field of plastics processing, and more specifically, to an airflow drying device for medical plastic particles. Background Technology

[0002] Medical plastics must undergo rigorous drying treatment before injection molding or extrusion to remove surface and internal moisture. Excessive moisture content not only leads to surface defects such as bubbles and silver streaks in the molded products, but more seriously, it can cause high-temperature hydrolytic degradation of the plastic, resulting in decreased mechanical strength and altered biocompatibility of medical devices, posing significant medical safety risks.

[0003] Currently, the common practice for dehydrating and drying these medical plastics is to use hot air stirring dryers. In operation, plastic granules are typically placed inside the dryer, and hot air is introduced along with internal mechanical stirring and purging to accelerate moisture evaporation. While this method can dry the plastic, the drying time is still relatively long. The main reason is that a large number of dried granules continuously occupy the limited heating space, hindering direct contact between the internal moist granules and the hot air flow, resulting in low heat exchange efficiency.

[0004] Therefore, an airflow drying device for medical plastic particles is proposed. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide an airflow drying device for medical plastic particles, which can improve drying efficiency.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A medical plastic particle airflow drying device includes a box with an exhaust port and a discharge port; a material box is fixedly inserted into the top of the box; A bracket is fixedly installed inside the box, and a hollow tube with an open top is vertically and rotatably mounted on the bracket. The top of the tube is rotatably sleeved outside the output end of the material box, and a motor for driving the tube to rotate is installed inside the box. The outer surface of the conduit is fitted with multiple annular support plates at intervals; each support plate has multiple meshes vertically fixedly installed on its upper surface. The meshes are evenly distributed along the circumference of the conduit, and the inner side of the meshes is fixedly connected to the conduit. A mounting rod corresponding to a partition mesh is horizontally and rotatably inserted into the side wall of the conduit. The mounting rod is located in front of the corresponding partition mesh in the direction of conduit rotation. A material-turning lever is fixedly installed circumferentially and evenly on the outer surface of the mounting rod. A circular groove matching the movement trajectory of the mounting rod is horizontally opened on the inner side wall of the box. The end of the mounting rod away from the conduit extends into the circular groove. The inner top wall of the circular groove rolls against the outer surface of the mounting rod, and both surfaces are provided with anti-slip texture. The sidewall of the conduit has multiple through holes that communicate with its interior, and these holes are located between two adjacent partitions on the same plane. An aeration plate is installed on the inner bottom wall of the box. The input end of the aeration plate is connected to an external high-temperature air source, and the discharge port is located at the bottom of the box.

[0008] Furthermore, multiple frustum-shaped guide blocks are fixedly installed inside the guide tube from top to bottom, with the inclined guide surfaces of the guide blocks facing upwards; each guide block has a vertically opened discharge hole penetrating its upper and lower end faces at its center, and the inner diameter of the multiple discharge holes gradually decreases from top to bottom; and the bottom wall of the guide tube is an upwardly convex arc surface, with the lowest point of the through hole and the lower surface of the guide block on the same plane.

[0009] Furthermore, the tray is a breathable mesh plate with a pore size smaller than that of medical plastic particles.

[0010] Furthermore, the bottom of the box is shaped like an inverted cone funnel, and the discharge port is located at the lowest point of the bottom of the inverted cone funnel; The aeration plate includes an air distribution plate and a cylindrical support rod, which is fixedly installed between the inner side wall of the box and the side wall of the air distribution plate. The outer edge of the air distribution plate is located inside the outer edge of the tray.

[0011] Furthermore, the bottom end of the conduit extends downward through the center of the air distribution plate and into the interior of the inverted conical funnel; a connecting rod is fixedly installed on the outer wall of the conduit inside the inverted conical funnel, and a scraper is fixedly installed at the end of the connecting rod, with the side of the scraper slidingly attached to the inner wall of the inverted conical funnel. A mounting bracket is fixedly installed on the inner wall of the enclosure. The motor is fixedly installed on the mounting bracket, and the output end of the motor is fixedly connected to the bottom end of the conduit.

[0012] Furthermore, the partition is an elastic mesh sheet; multiple baffles are evenly fixedly installed on the inner side wall of the box from top to bottom, with each baffle located above the tray of each layer and extending into the rotational trajectory of the partition.

[0013] Furthermore, the bottom wall of the annular groove is inclined with the outer side higher than the inner side, forming a guide slope that slopes downward toward the center of the box.

[0014] Furthermore, the end of the mounting rod near the conduit penetrates the side wall of the conduit and extends into the conduit, and a flow guiding cavity is formed in the mounting rod along its axial direction; a filter screen is fixedly installed at the end of the mounting rod located inside the conduit, and the filter screen connects the internal space of the conduit with the flow guiding cavity to prevent the material inside the conduit from entering the flow guiding cavity; The material turning lever has a hollow structure and is connected to the flow guide cavity. Multiple exhaust holes are evenly opened on the side wall of each material turning lever.

[0015] Furthermore, a rotary air inlet connector is fitted onto the part of the conduit located below the material box. The rotary air inlet connector is fixedly installed on the side wall of the bracket, and the input end of the rotary air inlet connector is connected to an external high-pressure hot air source, while the output end is connected to the inside of the conduit.

[0016] Furthermore, the upper surface of the pallet and the inclined guide surface of the guide block are coated with a medical-grade polytetrafluoroethylene coating.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting guide blocks with gradually decreasing inner diameter and corresponding through holes in the conduit, a large amount of material can be "separated" layer by layer from top to bottom and evenly spread on the surface of each layer of tray, preventing the single layer of material from accumulating too thickly; at the same time, in conjunction with the high-temperature hot air blown upward by the bottom aeration plate and the impact force of the partition net, the static plastic particle layer is broken up, increasing the contact area between the material and the hot air flow, allowing the moisture to evaporate quickly and improving the drying efficiency. In particular, it is effective for medical-grade polycarbonate (PC) or polyetheretherketone (PEEK) plastic particles at high temperatures. During drying, localized overheating and degradation of the surface can easily occur. This solution uses a combination of the orbital motion of the conduit and the rotation of the turning lever to mechanically disperse the particles, avoiding prolonged static heating of the medical plastic particles in the high-temperature airflow. Compared to conventional static hot air ovens, at the same drying temperature (e.g., a PEEK drying environment of 120°~150°), not only is the drying time significantly shortened, but the surface yellowing rate and local softening and adhesion rate of heat-sensitive particles are also greatly reduced, effectively ensuring the biocompatibility and original mechanical strength of the medical plastic.

[0018] (2) The friction between the rotating guide tube and the anti-slip texture of the annular groove drives the mounting rod to rotate, which in turn drives the turning lever to tumble and disperse the material at the bottom. At the same time, the high-pressure hot airflow introduced through the rotating air inlet joint is directly discharged through the exhaust hole, impacting and directly contacting the turned-up bottom material, further improving the drying efficiency.

[0019] (3) The partition is made of elastic mesh and baffles are installed on the inner wall of the box. The elastic deformation and rebound force generated by the collision further disperse the material and increase the contact area between the material and the high temperature gas. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the combined structure of the annular groove and the mounting rod of the present invention; Figure 6 This is a schematic diagram of the combined structure of the stop bar, mounting rod, and conduit of the present invention; Figure 7 This is a schematic diagram of the combined structure of the guide block and the unloading hole of the present invention.

[0021] Explanation of the labels in the diagram: 1. Box body; 2. Material box; 3. Support frame; 4. Guide tube; 5. Motor; 6. Pallet; 7. Partition screen; 8. Mounting rod; 9. Tilting lever; 10. Circular groove; 11. Through hole; 12. Aeration plate; 1201. Air distribution plate; 1202. Support rod; 13. Guide block; 14. Discharge hole; 15. Linkage rod; 16. Scraper; 17. Mounting frame; 18. Stop bar; 19. Guide cavity; 20. Filter screen; 21. Exhaust hole; 22. Rotary air inlet connector.

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Example 1: Please see Figures 1 to 7 A medical plastic particle airflow drying device includes a box 1 with an exhaust port and a lower discharge port; wherein the exhaust port is located on the top wall of the box 1 and is used to discharge hot and humid gas carrying moisture, and the discharge port is used to discharge the dried finished particles. A material box 2 is fixedly inserted into the top of the box 1, and the output end of the material box 2 extends vertically downward into the interior of the box 1; wherein, a star-shaped unloading valve is fixedly installed inside the output end of the material box 2, so as to quantitatively and uniformly feed the medical plastic particles that fall into the hollow structure of the conduit 4. The medical plastic particles to be dried are stored in the material bin 2. The quantitative, air-closed downward feeding is achieved by the uniform rotation of the star-shaped discharge valve. A bracket 3 is fixedly installed inside the box 1. A hollow conduit 4 with an open top is vertically and rotatably installed on the bracket 3. The top of the conduit 4 is rotatably sleeved outside the output end of the material box 2. A motor 5 for driving the axial rotation of the conduit 4 is provided inside the box 1. Multiple annular support plates 6 are fixedly fitted on the outer surface of the conduit 4 from top to bottom. The support plates 6 rotate synchronously with the conduit 4. An annular gap is left between the outer edge of the support plate 6 and the inner wall of the box 1 for material to fall. Multiple partitions 7 are vertically fixedly installed on the upper surface of each support plate 6. The multiple partitions 7 are evenly distributed along the circumference of the conduit 4, and the inner side of the partitions 7 is fixedly connected to the outer wall of the conduit 4. When the conduit 4 rotates, the partitions 7 can provide resistance to the material on the surface of the support plate 6, ensuring that the material can move away from the conduit 4 under the action of centrifugal force. Mounting rods 8, corresponding one-to-one with partitions 7, are horizontally and rotatably inserted into the side wall of the conduit 4. The mounting rods 8 are located on the front side of the corresponding partitions 7 in the rotation direction of the conduit 4. Tilting rods 9 are circumferentially and uniformly fixed on the outer surface of the mounting rods 8. A circular groove 10 matching the movement trajectory of the mounting rods 8 is horizontally opened on the inner side wall of the housing 1. The end of the mounting rod 8 away from the conduit 4 extends into the circular groove 10. The inner top wall of the circular groove 10 and the outer surface of the mounting rod 8 form a rolling pressing fit, and both of them have anti-slip textures at the contact surface. Furthermore, a high-temperature resistant high-friction coefficient material layer, such as a fluororubber ring, can be provided at the contact surface to prevent thermal expansion jamming or loss of friction caused by dust in high-temperature environments, so as to drive the mounting rods 8 to roll through friction. The side wall of the conduit 4 is provided with multiple through holes 11 that communicate with its interior. Multiple guide blocks 13 are fixedly installed in the conduit 4 from top to bottom, each corresponding to a through hole 11, so as to intercept the material falling in the conduit 4 and guide it to the corresponding through hole 11 for discharge. The lowest point of the through hole 11 and the lower surface of the guide block 13 are on the same plane and located between two adjacent partitions 7 on the same plane. An aeration plate 12 is provided on the inner bottom wall of the box 1. The input end of the aeration plate 12 is connected to the external high-temperature air source, and the aeration plate 12 is located directly below the guide tube 4 and each support plate 6. The discharge port is opened at the bottom of the box 1.

[0024] like Figure 2 As shown, multiple frustum-shaped guide blocks 13 are fixedly installed inside the conduit 4 from top to bottom, with the inclined guide surfaces of the guide blocks 13 facing upwards; each guide block 13 has a vertically protruding discharge hole 14 penetrating its upper and lower end faces at its center, and the inner diameters of the discharge holes 14 of each layer of guide blocks 13 from top to bottom are d. i (in =1、2、3……n (where n is the number of layers of the guide block), then it satisfies 1> 2> 3>…… > n To ensure that the material thickness distributed on each pallet 6 is basically consistent, the difference in the flow cross-sectional area between two adjacent unloading holes 14 is equal to the effective bearing area S of a single pallet 6. tray The flow is set in a positively correlated ratio to achieve equal flow distribution through the aperture gradient; the inner bottom wall of the conduit 4 is an upwardly convex arc surface.

[0025] like Figure 2 As shown, the tray 6 is a breathable mesh plate with a pore size smaller than that of medical plastic particles, which can prevent materials from falling off while ensuring that gas can flow upward normally and come into contact with the materials.

[0026] First, start motor 5 to drive guide tube 4, support plate 6 and partition net 7 to rotate at a constant speed, and at the same time supply air to aeration plate 12 through external high temperature air source.

[0027] Moist medical plastic particles are metered into the hollow conduit 4 via a star-shaped discharge valve. When the material falls to the uppermost guide block 13, because the discharge hole 14 at this point is relatively large, the material in the center passes directly through the discharge hole 14 and continues to fall; while the material falling on the inclined surface outside the guide block 13 slides down the inclined surface into the through hole 11 on the side wall of the conduit 4, is thrown out and evenly spread on the first layer of support plate 6.

[0028] As the falling material passes through the second and third guide blocks 13, the material is gradually "separated" and distributed to the corresponding pallets 6 as the discharge hole diameter decreases with each layer.

[0029] The small amount of remaining material that falls to the bottom of the conduit 4 is guided by the upward-convex arc-shaped bottom wall and is discharged from the bottom through hole 11. Through the multi-level orifice throttling distribution, it is ensured that the initial distribution thickness of the material on each layer of the tray 6 is maintained within the range suitable for hot airflow penetration, thus avoiding the drying dead zone caused by excessive local accumulation.

[0030] Plastic particles, distributed onto the perforated trays 6 in each layer, move and tumble circumferentially under the influence of the partition net 7. Simultaneously, a high-temperature hot airflow blown from the bottom aeration plate 12 passes upwards through each layer of perforated plates. Under the combined effect of the hot airflow and the mechanical agitation of the partition net 7, preferably, based on the gravity of the conventional medical-grade PC or PEEK plastic particles, the apparent wind speed of the bottom airflow penetrating the trays 6 upwards is controlled within a range that overcomes the critical velocity for particle suspension, such as... The plastic particle layer is in a dynamic suspension or semi-boiling state. The moisture on its surface gradually evaporates under the action of heat exchange and is carried away by hot air. The dried and lighter material gradually moves towards the edge of the pallet 6 as it is turned over, and finally falls from the annular gap at the outer edge to the discharge port at the bottom of the box 1. The exhaust gas carrying moisture is discharged from the exhaust port at the top of the box 1.

[0031] When the guide tube 4 drives the mounting rod 8 to revolve around the center of the box 1, the mounting rod 8 rotates synchronously under the friction between its end and the inner top wall of the annular groove 10, which in turn drives the material turning lever 9 on it to actively roll and disperse the material on the surface of the pallet 6, increasing the contact area between the material and the hot airflow and improving the heat exchange effect.

[0032] like Figure 2 As shown, the bottom of the box 1 is an inverted conical funnel, and the discharge port is located at the lowest point of the bottom of the inverted conical funnel; The aeration plate 12 includes an air distribution plate 1201 and a cylindrical support rod 1202. The support rod 1202 is fixedly installed between the inner side wall of the box 1 and the side wall of the air distribution plate 1201. The outer edge of the air distribution plate 1201 is located inside the outer edge of the pallet 6 so that the air distribution plate 1201 avoids the trajectory of the material falling through the annular gap.

[0033] By making the size of the aeration plate 12 smaller than that of the tray 6, the falling channel of the annular gap at the edge can be avoided. When the dried medical plastic particles fall from the edge of the tray 6, they will fall into the bottom of the inverted conical funnel and be discharged from the outlet, which prevents the material from falling onto the surface of the aeration plate 12, while ensuring that the hot air is sprayed upward normally.

[0034] like Figure 2 , Figure 7 As shown, the bottom end of the conduit 4 extends downward through the center of the air distribution plate 1201 and extends into the inside of the inverted conical funnel; a connecting rod 15 is fixedly installed on the outer wall of the conduit 4 inside the inverted conical funnel, and a scraper 16 is fixedly installed at the end of the connecting rod 15. The side of the scraper 16 slides against the inner side wall of the inverted conical funnel to sweep the material that falls to the bottom of the box 1 into the discharge port and prevent the material from accumulating on the inclined surface inside the box 1. A mounting bracket 17 is fixedly installed on the inner side wall of the housing 1. The motor 5 is fixedly installed on the mounting bracket 17, and the output end of the motor 5 is fixedly connected to the bottom end of the conduit 4.

[0035] like Figure 2 , Figure 6 As shown, the partition 7 is an elastic mesh sheet; multiple baffles 18 are evenly fixedly installed on the inner side wall of the box 1 from top to bottom. The multiple baffles 18 are located above each layer of support plate 6 and extend into the rotation trajectory of the partition 7.

[0036] When the partition 7 rotates with the guide tube 4, it will undergo elastic deformation and bend when it encounters the baffle 18. At this time, the partition 7 slides along the surface of the baffle 18 and deforms. Preferably, the partition 7 is made of medical-grade high elastic modulus material, such as 316L spring steel or special phosphor bronze. After the contact is broken, the partition 7 generates high-frequency micro-vibration under its own elastic force. The micro-vibration wave is transmitted to the plastic particle layer on the surface of the tray 6. Without generating mechanical crushing dust, it can further disperse the material and improve the drying efficiency.

[0037] like Figure 5 As shown, the bottom wall of the annular groove 10 is inclined with the outer side higher than the inner side, forming a guide slope that slopes downward toward the center of the box 1. Medical plastic particles splashed into the annular groove 10 can automatically slide down along the guide slope under the action of gravity.

[0038] like Figure 3 , Figure 4 , Figure 6 As shown, the end of the mounting rod 8 near the conduit 4 passes through the side wall of the conduit 4 and extends into the interior of the conduit 4, and a flow guide cavity 19 is provided in the mounting rod 8 along its axial direction; a filter screen 20 is fixedly installed at the end of the mounting rod 8 located inside the conduit 4, and the filter screen 20 separates the interior space of the conduit 4 from the flow guide cavity 19 to prevent the material in the conduit 4 from entering the flow guide cavity 19. The material turning lever 9 has a hollow structure and is connected to the guide cavity 19. Multiple exhaust holes 21 are evenly opened on the side wall of each material turning lever 9.

[0039] like Figure 2 As shown, a rotary air inlet connector 22 is fitted on the part of the conduit 4 located below the material box 2. The rotary air inlet connector 22 is fixedly installed on the side wall of the bracket 3, and the input end of the rotary air inlet connector 22 is connected to an external high-pressure hot air source, and the output end is connected to the inside of the conduit 4. The rotary air inlet connector 22 is existing technology and will not be described in detail. The side wall of the conduit 4 has a hole that connects to the output end of the rotary air inlet connector 22, so the rotary air inlet connector 22 can supply air to the conduit 4.

[0040] In operation, an external high-pressure hot air source continuously injects hot air into the rotating duct 4 through the rotating air inlet connector 22, thereby generating a downward pneumatic thrust on the material inside the duct 4 and accelerating the material to be discharged from the through hole 11 on the side wall of the duct 4. At the same time, the high-pressure hot air in the duct 4 passes through the filter screen 20 and enters the guide cavity 19 of the mounting rod 8, and is finally ejected from the exhaust hole 21 on the side wall of the material turning lever 9. The high-speed hot air directly impacts the bottom material that has been turned up, achieving the dual effects of mechanical dispersal and targeted airflow direct injection, further improving the drying efficiency.

[0041] like Figure 2As shown, the upper surface of the tray 6 and the inclined guide surface of the guide block 13 are coated with a medical-grade polytetrafluoroethylene coating. Since the surface of medical plastic particles is easily softened and sticky when dehydrated in a high-temperature hot airflow, coating the guide block 13 and the tray 6 with a medical-grade polytetrafluoroethylene coating can prevent the heated material from adhering to the surface of the guide block 13 and the tray 6, ensuring that the plastic particles slide smoothly under the action of centrifugal force. Moreover, the coating has high temperature resistance and chemical inertness, and will not release harmful substances or particles into the drying environment, preventing high-temperature thermal degradation and denaturation caused by material retention. In addition, a high-temperature resistant flexible silicone scraper is fixedly installed at the end of the material turning lever 9, which can prevent the coating from being scratched and damaged.

[0042] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A medical plastic particle airflow drying device, comprising a housing (1) with an exhaust port and a discharge port; characterized in that: A material box (2) is fixedly inserted into the top of the box body (1); A bracket (3) is fixedly installed inside the box (1). A hollow conduit (4) with an open top is vertically and rotatably installed on the bracket (3). The top of the conduit (4) is rotatably sleeved outside the output end of the material box (2). A motor (5) for driving the conduit (4) to rotate is provided inside the box (1). The outer surface of the conduit (4) is fixedly fitted with multiple annular support plates (6) at intervals; multiple partitions (7) are vertically fixedly installed on the upper surface of each support plate (6), and the multiple partitions (7) are evenly distributed along the circumference of the conduit (4), and the inner side of the partitions (7) is fixedly connected to the conduit (4). The side wall of the conduit (4) is horizontally and rotatably fitted with mounting rods (8) corresponding to the partition net (7), and the mounting rods (8) are located on the front side of the corresponding partition net (7) in the rotation direction of the conduit (4); the outer surface of the mounting rods (8) is circumferentially and evenly fixed with material turning levers (9); the inner side wall of the box (1) is horizontally provided with an annular groove (10) matching the mounting rod (8), and the end of the mounting rod (8) away from the conduit (4) extends into the annular groove (10); the inner top wall of the annular groove (10) and the outer surface of the mounting rod (8) form a rolling pressing fit; and the contact surfaces of both are provided with anti-slip textures; The conduit (4) has multiple through holes (11) communicating with its interior on its side wall. Multiple guide blocks (13) are fixedly installed in the conduit (4) from top to bottom, each corresponding to a through hole (11) in each layer, so as to intercept the material falling in the conduit (4) and guide it to the corresponding through hole (11) for discharge. The through holes (11) are located between two adjacent meshes (7) on the same plane. An aeration plate (12) is provided on the inner bottom wall of the box (1). The input end of the aeration plate (12) is connected to an external high-temperature air source, and the discharge port is located at the bottom of the box (1).

2. The airflow drying equipment for medical plastic particles according to claim 1, characterized in that: Multiple frustum-shaped guide blocks (13) are fixedly installed inside the conduit (4) from top to bottom, with the inclined guide surface of the guide block (13) facing upward; each guide block (13) has a vertically opened discharge hole (14) penetrating its upper and lower end faces at its center, and the inner diameter of the multiple discharge holes (14) gradually decreases from top to bottom; and the bottom wall of the conduit (4) is an upwardly convex arc surface, and the lowest point of the through hole (11) is on the same plane as the lower surface of the guide block (13).

3. The airflow drying equipment for medical plastic particles according to claim 2, characterized in that: The tray (6) is a breathable mesh plate with a pore size smaller than that of medical plastic particles.

4. The airflow drying equipment for medical plastic particles according to claim 3, characterized in that: The bottom of the box (1) is an inverted conical funnel, and the discharge port is located at the lowest point of the bottom of the inverted conical funnel; The aeration plate (12) includes an air distribution plate (1201) and a cylindrical support rod (1202), which is fixedly installed between the inner side wall of the box (1) and the side wall of the air distribution plate (1201). The outer edge of the air distribution plate (1201) is located inside the outer edge of the tray (6).

5. The airflow drying equipment for medical plastic particles according to claim 4, characterized in that: The bottom end of the conduit (4) extends downward through the center of the air distribution plate (1201) and extends into the inside of the inverted conical funnel; a connecting rod (15) is fixedly installed on the outer wall of the conduit (4) inside the inverted conical funnel, and a scraper (16) is fixedly installed at the end of the connecting rod (15), and the side of the scraper (16) slides against the inner wall of the inverted conical funnel; A mounting bracket (17) is fixedly installed on the inner side wall of the housing (1), and the motor (5) is fixedly installed on the mounting bracket (17), and the output end of the motor (5) is fixedly connected to the bottom end of the conduit (4).

6. The airflow drying equipment for medical plastic particles according to claim 1, characterized in that: The partition (7) is an elastic mesh sheet; multiple baffles (18) are evenly fixedly installed on the inner side wall of the box (1) from top to bottom. The multiple baffles (18) are located above the trays (6) of each layer and extend into the rotational trajectory of the partition (7).

7. The airflow drying equipment for medical plastic particles according to claim 1, characterized in that: The bottom wall of the annular groove (10) is inclined with the outside higher than the inside, forming a flow guide slope that slopes downward toward the center of the box (1).

8. The airflow drying equipment for medical plastic particles according to claim 1, characterized in that: The mounting rod (8) has one end near the conduit (4) that penetrates the side wall of the conduit (4) and extends into the interior of the conduit (4), and a flow guide cavity (19) is provided in the mounting rod (8) along its axial direction; a filter screen (20) is fixedly installed at one end of the mounting rod (8) inside the conduit (4), and the filter screen (20) connects the interior space of the conduit (4) with the flow guide cavity (19) to prevent the material in the conduit (4) from entering the flow guide cavity (19); The material turning lever (9) has a hollow structure and is connected to the flow guide cavity (19). Multiple exhaust holes (21) are evenly opened on the side wall of each material turning lever (9).

9. The airflow drying equipment for medical plastic particles according to claim 1, characterized in that: The conduit (4) is fitted with a rotary air inlet connector (22) at the part below the material box (2). The rotary air inlet connector (22) is fixedly installed on the side wall of the bracket (3). The input end of the rotary air inlet connector (22) is connected to an external high-pressure hot air source, and the output end is connected to the inside of the conduit (4).

10. The airflow drying equipment for medical plastic particles according to claim 1, characterized in that: The upper surface of the tray (6) and the inclined guide surface of the guide block (13) are coated with medical-grade polytetrafluoroethylene coating.

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