Centralized feeding system for medical cap production

Abstract

The utility model discloses a centralized feeding system of medical cover production belongs to medical plastic product production equipment technical field, it includes: dust removal subassembly, plating assembly and distribution subassembly through pipeline communication in proper order, dust removal subassembly is used for separating plastic particle and dust, plating assembly includes plating box and spray unit, and spray unit sets up in plating box, and spray unit can spray out the liquid mist for the film plating of plastic particle to plating box, and the input of plating box is communicated with the particle export of dust removal subassembly, distribution subassembly includes centralized discharge hopper and distribution unit, and the input of centralized discharge hopper is communicated with the output of plating box, and distribution unit includes adapter, and the input of adapter is communicated with centralized discharge hopper, and a plurality of outputs of adapter are communicated with different injection molding machine through pipeline respectively. The utility model can suppress dust production and centralized feeding.

Description

Technical Field

[0001] This utility model relates to the technical field of medical plastic product manufacturing equipment, and in particular to a centralized material supply system for the production of medical covers. Background Technology

[0002] Medical caps are generally made by injection molding a mixture of polypropylene (PP) plastic granules and color masterbatch granules (for color adjustment). They have outstanding advantages in terms of safety, chemical stability, processability, and cost-effectiveness, and are therefore widely used.

[0003] In actual production, PP plastic granules are usually collected together and then transported to different injection molding machines through pipelines. When the PP plastic granules move in the pipeline, they collide and rub against each other and against the pipe wall, often accompanied by the generation of a large amount of dust.

[0004] The presence of dust can cause blockages and damage to injection molding machines. During the heating process, dust may accumulate in the nozzles or mold channels of the injection molding machine, leading to poor flow and increased downtime and maintenance costs. Secondly, dust can negatively impact the appearance and mechanical properties of injection-molded products. Because dust affects particle flowability, it causes uneven melting, potentially resulting in uneven surfaces, bubbles, defects, and even affecting the strength and durability of the medical cap. Utility Model Content

[0005] In view of this, it is necessary to provide a centralized feeding system for the production of medical caps to solve the problem of dust contamination affecting product quality during the existing medical cap production process.

[0006] This utility model provides a centralized feeding system for the production of medical caps, comprising: a dust removal component, a coating component, and a material distribution component connected in sequence by pipes;

[0007] The dust removal assembly is used to separate plastic particles and dust.

[0008] The coating assembly includes a coating box and a spray unit. The spray unit is disposed in the coating box and can spray liquid mist into the coating box to coat the plastic particles, so as to prevent the plastic particles from generating dust again. The input end of the coating box is connected to the particle outlet of the dust removal assembly.

[0009] The material distribution assembly includes a centralized discharge hopper and a material distribution unit. The input end of the centralized discharge hopper is connected to the output end of the coating box to centrally distribute the coated plastic granules. The material distribution unit includes an adapter. The input end of the adapter is connected to the centralized discharge hopper, and the multiple output ends of the adapter are respectively connected to different injection molding machines through pipes.

[0010] Furthermore, the spray unit includes multiple vertically upward-arranged atomizing heads, which can spray upwards onto the falling plastic particles, causing a coating to adhere to the surface of the plastic particles.

[0011] Furthermore, the multiple sets of spray units are arranged at equal intervals along the vertical direction.

[0012] Furthermore, the coating assembly also includes a liquid circulation unit, which includes a storage tank for storing the coating solution and a liquid circulation pipeline. The two ends of the liquid circulation pipeline are respectively connected to the bottom of the coating tank and the atomizing head, and the middle part of the liquid circulation pipeline is connected to the storage tank. The storage tank can draw up the coating solution accumulated at the bottom of the coating tank and deliver the coating solution to the atomizing head.

[0013] Furthermore, the bottom of the coating tank is provided with a solid-liquid separation unit, which includes an inclined separation net that can separate plastic particles from the coating liquid and guide the plastic particles to gather to one side.

[0014] Furthermore, the material distribution unit also includes an adapter with multiple interconnected interfaces. One interface of the adapter is connected to the bottom of the centralized discharge hopper via a pipe to siphon plastic granules. The other interfaces of the adapter are connected to multiple injection molding machines via pipes to convey coated granules from the centralized discharge hopper.

[0015] Furthermore, the dust removal assembly includes a cyclone dust collector for separating plastic particles and dust-containing airflow, and a bag filter dust collector, wherein the bag filter dust collector is connected to the outlet of the cyclone dust collector through a pipe to separate dust in the airflow.

[0016] Furthermore, the top of the coating box is connected to the particle output port of the cyclone dust collector via a pipe, and the cyclone dust collector is capable of rotating and dispersing plastic particles.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) A centralized feeding system for the production of medical caps of this utility model is provided with a coating component, which includes a coating box and a spraying unit. The coating box can form a relatively sealed environment to ensure that the coating process is carried out independently. The spraying unit is set in the coating box and can spray liquid mist for coating plastic particles into the coating box. When the plastic particles pass through the coating box, the liquid adheres to the surface of the plastic particles to form a coating layer. The coating layer can increase the surface smoothness of the particles, reduce the friction between the particles, avoid the breakage of the particles during the processing, and prevent the generation of dust from the source.

[0019] (2) A centralized feeding system for the production of medical caps according to this utility model is provided with a material distribution component. The material distribution component includes a centralized discharge hopper and a material distribution unit. The input end of the centralized discharge hopper is connected to the output end of the coating box. The centralized discharge hopper can store a large amount of plastic granules from the coating box and enrich the plastic granules. The material distribution unit includes a converter. The input end of the converter is connected to the centralized discharge hopper. The multiple output ends of the converter are connected to different injection molding machines through pipes to provide raw materials for different injection molding machines. It adapts to the asynchronous feeding needs of multiple machines and has wide application and strong adaptability. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the coating component in this utility model;

[0023] Figure 3 This is a schematic diagram of the spray unit in this utility model. Figure 1 ;

[0024] Figure 4 This is a schematic diagram of the spray unit in this utility model. Figure 2 ;

[0025] Figure 5 This is a schematic diagram of the connection structure between the spray unit and the support frame in this utility model.

[0026] In the diagram, 100 is the dust removal assembly; 110 is the cyclone dust collector; 120 is the bag filter dust collector; 200 is the coating assembly; 210 is the coating box; 220 is the spray unit; 221 is the atomizing head; 222 is the support frame; 230 is the liquid circulation unit; 231 is the liquid storage tank; 232 is the liquid circulation pipeline; 240 is the solid-liquid separation unit; 241 is the separation screen; 300 is the material distribution assembly; 310 is the centralized discharge hopper; 320 is the material distribution unit; and 321 is the adapter. Detailed Implementation

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0028] This embodiment describes a centralized feeding system for medical cap production. By incorporating a coating component 200, the surface of plastic granules is coated, preventing breakage and the generation of new dust particles. Simultaneously, a distribution component 300 distributes the centrally coated plastic granules evenly to different injection molding machines according to demand, achieving centralized feeding of plastic materials and improving equipment production efficiency.

[0029] Please see Figures 1 to 5 This embodiment of a centralized feeding system for medical cap production includes: a dust removal component 100, a coating component 200, and a material distribution component 300 connected sequentially by pipes. The dust removal component 100 separates and removes dust from the plastic granule raw material, retaining relatively clean plastic granules. The coating component 200 coats the surface of the plastic granules with a coating to protect them from breakage during transport. The material distribution component 300 collects the coated plastic granules and transports them to different injection molding machines as needed.

[0030] The coating assembly 200 includes a coating chamber 210 and a spray unit 220. The coating chamber 210 can form a relatively sealed environment to ensure that the coating process can be carried out independently. The spray unit 220 is disposed in the coating chamber 210 and can spray liquid mist for coating plastic particles into the coating chamber 210. As the plastic particles pass through the coating chamber 210, the liquid adheres to the surface of the plastic particles to form a coating layer. The coating layer can increase the surface smoothness of the particles, reduce the friction between the particles, prevent the particles from breaking during the processing, and prevent the generation of dust from the source.

[0031] The input end of the coating box 210 is connected to the particle outlet of the dust removal component 100. The dust removal component 100 can transport the separated and dust-free plastic particles to the coating box 210 for coating treatment of the dust-free plastic particles.

[0032] The material distribution assembly 300 includes a centralized discharge hopper 310 and a material distribution unit 320. The input end of the centralized discharge hopper 310 is connected to the output end of the coating box 210. The centralized discharge hopper 310 can store a large amount of plastic granules from the coating box 210, thus enriching and storing the plastic granules. The material distribution unit 320 includes an adapter 321. The input end of the adapter 321 is connected to the centralized discharge hopper 310, and the multiple output ends of the adapter 321 are respectively connected to different injection molding machines through pipes, providing raw materials to different injection molding machines. This adapts to the asynchronous feeding needs of multiple machines, making it widely applicable and highly adaptable.

[0033] During use, plastic granules are cleaned of surface dust by the dust removal component 100 and then enter the coating chamber 210. Atomizing nozzles in the coating chamber 210 spray coating liquid mist, and the granules, falling under gravity, come into full contact with the liquid mist, forming a uniform thin film on their surface. The coated granules are then temporarily stored in a centralized discharge hopper 310, and the transfer component 321 distributes and conveys the granules according to a preset ratio based on the injection molding machine's operating conditions.

[0034] It should be noted that fans are installed on the dust removal component 100, the coating component 200, and the material distribution component 300, or in the interconnected pipes. The fans can drive the plastic particles to move relative to each other through negative pressure.

[0035] In some embodiments, please refer to Figures 2 to 4 The spray unit 220 includes multiple vertically upward-arranged atomizing heads 221. The atomizing heads 221 can spray upward, and the liquid mist can fully contact the downward-falling plastic particles, so that a coating is attached to the surface of the plastic particles, forming a protective layer on the surface of the plastic particles.

[0036] In practical implementation, the atomizing head 221 is positioned vertically upwards, with its spray direction opposite to the direction of gravity. The atomizing head 221 can be implemented using a high-pressure nozzle or an ultrasonic atomizer. Through reverse spraying, the liquid mist makes impact contact with the falling particles. The upward-spraying liquid mist and the downward-falling plastic particles intersect and overlap, forming a uniform liquid film upon collision with the particle surface. Because the atomization direction is opposite to the particle movement direction, the contact time between the liquid mist and the particles is prolonged, allowing the droplets to spread on the particle surface and form a continuous coating. The particle group is processed layer by layer by the atomizing heads 221 at different heights during continuous falling, ensuring that each particle undergoes at least two coating operations.

[0037] When the plastic particles enter from the top of the coating tank 210, they fall freely under the influence of gravity. Multiple vertically arranged atomizing heads 221 continuously spray coating liquid mist along the particle's falling path, and the liquid mist collides with the particle surface to form a uniform liquid film.

[0038] Traditional horizontal spraying methods suffer from blind spots in liquid mist coverage, leaving some particles' sides uncoated. This solution achieves three-dimensional coverage through vertical reverse spraying, enhancing the liquid mist's ability to penetrate between particles and reducing coating dead zones. Simultaneously, a dynamic balance is achieved between particle fall velocity and atomization pressure, preventing droplets from being carried away from the effective area by high-speed airflow.

[0039] In some embodiments, multiple spray units 220 are arranged at equal intervals along the vertical direction, and each plastic particle is sprayed by multiple spray units 220, which can not only avoid some plastic particles from being missed, but also ensure the effective thickness of the coating.

[0040] In the specific implementation process, the spray units 220 are arranged at equal intervals in the vertical direction, and multiple sets of spray units 220 are distributed at the same interval in the vertical direction. This can be achieved by using a fixed bracket or a sliding rail structure. Its function is to ensure that the particle surface is in full contact with the liquid mist by covering the falling path of particles at different heights in layers.

[0041] As plastic granules fall under gravity after entering the coating chamber 210, multiple spray units 220 are distributed vertically at equal intervals, ensuring that the granules pass through spray areas at different heights during their descent. Each layer of spray units 220 sprays liquid mist upwards, which collides with and adheres to the surface of the falling granules. Because the spray units 220 are evenly spaced, the granules receive a similar amount of liquid mist coverage in each layer, thus avoiding problems of insufficient or excessive coating in certain areas.

[0042] Traditional coating equipment typically only has a spray unit 220 at a single location, resulting in insufficient liquid mist coverage after particles fall, leading to uneven coating thickness. This application uses multiple spray units 220 at equal intervals to ensure that particles are continuously in contact with liquid mist throughout their fall path, resulting in more comprehensive coating coverage and effectively reducing secondary dust generated by friction from uncoated particles.

[0043] In some embodiments, please refer to Figure 1 and Figure 2 The coating assembly 200 also includes a liquid circulation unit 230, which includes a storage tank 231 for storing the coating solution and a liquid circulation pipeline 232. The two ends of the liquid circulation pipeline 232 are connected to the bottom of the coating tank 210 and the atomizing head 221, respectively, and the middle part of the liquid circulation pipeline 232 is connected to the storage tank 231. The storage tank 231 can draw up the coating solution accumulated at the bottom of the coating tank 210 and deliver the coating solution to the atomizing head 221, so as to realize the repeated application of the coating solution.

[0044] In practical implementation, the liquid circulation unit 230 is a system that circulates the coating solution through pipeline connections. Specifically, it can be implemented using a combination of centrifugal pumps and pipeline valves to recover and reuse the liquid that settles in the coating tank 210. The storage tank 231 is a container used to temporarily store the coating solution, and can be implemented using a stainless steel sealed container to maintain the stability of the coating solution supply. The coating solution is a solution obtained by mixing a silane compound with a suitable solvent. Common silane compounds include methylsilane (MPTMS), aminosilane (APTMS), and fluorosilanes.

[0045] The liquid circulation pipeline 232 refers to the delivery channel connecting the coating tank 210, the liquid storage tank 231 and the atomizing head 221. It can be implemented using a corrosion-resistant metal flexible hose to achieve directional flow and pressure control of the coating solution.

[0046] During operation, the coating solution accumulated at the bottom of the coating tank 210 is drawn into the storage tank 231 through the liquid circulation pipeline 232. The storage tank 231 then pressurizes and delivers the coating solution to the atomizing head 221 via a pump. A diversion interface is provided in the middle section of the liquid circulation pipeline 232, connecting to the storage tank 231, allowing excess liquid to be temporarily stored in the storage tank 231, thus preventing fluctuations in the liquid supply pressure to the atomizing head 221. When the liquid level in the coating tank 210 drops due to coating solution consumption, new coating solution can be replenished to the storage tank 231 from the outside.

[0047] In some embodiments, please refer to Figures 3 to 5 The coating assembly 200 also includes a support frame 222, which is disposed in the coating chamber 210. The edge of the support frame 222 is connected to the inner wall of the coating chamber 210. Multiple atomizing heads 221 are connected to the bottom of the support frame 222 and are vertically upward. The liquid circulation pipeline 232 is connected to different atomizing heads 221 respectively to provide coating liquid to the atomizing heads 221.

[0048] In the specific implementation process, the support frame 222 is welded from cross-shaped profiles, and the edges of the profiles are welded to the inner wall of the coating box 210 as one piece. The atomizing head 221 is connected to the profiles through fasteners.

[0049] In some embodiments, the bottom of the coating tank 210 is provided with a solid-liquid separation unit 240, which includes an inclined separation net 241. The separation net 241 can separate plastic particles from the coating liquid and guide the plastic particles to gather to one side, so that the coated plastic particles can enter the subsequent process steps, while the coating liquid continues to work in the liquid circulation pipeline 232.

[0050] In practical implementation, the solid-liquid separation unit 240 is a device for physically separating solid particles from liquid media in a mixture. Specifically, it can be implemented using a mechanical device with a filtration structure. An inclined separation net 241 with a porous structure is installed at the bottom of the coating tank 210. Under gravity, the liquid coating solution permeates to the lower layer, while solid plastic particles slide and accumulate along the inclined surface. The inclined separation net 241 refers to a filtration structure installed at a non-horizontal angle; specifically, a woven wire mesh or a perforated plate can be used as the filter medium.

[0051] For example, the separation mesh 241 is angled at 15°-45° to the horizontal plane, so that the plastic particles slide along the inclined surface to the collection area under the action of gravity, while the coating solution flows into the bottom recycling channel through the mesh.

[0052] During the coating process, when the mixture of plastic particles containing the coating solution enters the bottom of the coating tank 210, the inclined separation net 241 intercepts the plastic particles through its mesh structure, while the coating solution flows through the mesh into the bottom storage area. Because the separation net 241 is inclined, the plastic particles slide along the inclined surface to the side outlet under the action of gravity, achieving solid-liquid separation and directional particle aggregation.

[0053] It should be noted that a closable damper is provided at the output end of the coating tank 210. The damper remains open under the action of a spring, allowing plastic particles to pass through normally and accumulate in a temporary storage tank located on one side of the coating tank 210. When the centralized discharge hopper 310 intermittently generates negative pressure suction, the damper overcomes the spring force and relatively closes, blocking the connection between the coating tank 210 and the centralized discharge hopper 310. Plastic particles can be attracted by the negative pressure and enter the centralized discharge hopper 310. The damper design prevents the coating solution from being drawn into the centralized discharge hopper 310.

[0054] A heating system is installed in the temporary storage box. The heating system can heat the plastic granules to 60℃-100℃, which can promote the rapid drying and curing of the coating on the surface of the plastic granules. This helps the coating to be formed uniformly and quickly, and avoids the incompletely cured coating layer from falling off or sticking together, which would interfere with the subsequent injection molding process.

[0055] In the specific implementation process, the heating system is a hot air oven or an infrared heating device, which can uniformly heat the coating surface and avoid local unevenness caused by excessive temperature, thereby achieving a rapid curing effect.

[0056] In some embodiments, please refer to Figure 1 The material distribution unit 320 also includes an adapter with multiple interconnected interfaces. One interface of the adapter is connected to the bottom of the centralized discharge hopper 310 via a pipe, thereby siphoning the coated plastic granules. The other interfaces of the adapter are connected to multiple injection molding machines via pipes, thereby conveying coated granules from the coating tank 210. The multi-port siphon structure of the adapter enables automatic granule distribution without power, simplifying the pipeline layout and reducing the risk of dust regeneration through liquid film protection. In addition, the converging flow channel design of the adapter makes the granule distribution more uniform, avoiding the problem of unstable material supply to the injection molding machines caused by flow differences in traditional multi-pipe systems.

[0057] In practical implementation, the adapter is a connecting component with a multi-channel interconnection structure. Specifically, it can be implemented using a Y-type or T-type fitting with three or more branch interfaces, ensuring a smooth transition of the internal flow channels to avoid particle retention. The adapter has a main interface with a relatively large inner diameter, which connects to the bottom of the centralized discharge hopper 310. The adapter also has multiple branch interfaces with relatively smaller inner diameters, which connect to different injection molding machines via pipes.

[0058] During operation, the coated plastic granules gather at the bottom of the centralized discharge hopper 310 under gravity. A flow-controllable valve is installed between the centralized discharge hopper 310 and the main interface. A siphon effect is formed by connecting the bottom of the centralized discharge hopper 310 to the adapter pipe, causing the granules to flow into the adapter with the coating liquid. The multi-interface structure inside the adapter evenly distributes the granule flow to multiple branch pipes, each connected to the inlet of a different injection molding machine. Because the siphon effect avoids friction caused by mechanical conveying, the liquid film adhering to the surface of the coated granules remains intact, effectively preventing secondary dust generation due to collisions during transport.

[0059] Traditional material distribution systems typically use independent pipes to connect the centralized discharge hopper 310 and the injection molding machine, resulting in a large number of pipes and low switching efficiency. Furthermore, mechanical conveying devices can easily damage the coating layer and generate dust. This solution utilizes a multi-port siphon structure with an adapter to achieve automatic particle distribution without power, simplifying the pipe layout and reducing the risk of dust regeneration through liquid film protection.

[0060] It should be noted that the injection molding machine and the centralized discharge hopper 310 are often located in different areas. The pipeline between the injection molding machine and the centralized discharge hopper 310 is relatively long, and plastic particles are prone to collisions with each other and with the pipe wall. The coating liquid can protect the plastic particles from collisions that could cause them to break and generate dust.

[0061] In some embodiments, please refer to Figure 1 The dust removal assembly 100 includes a cyclone dust collector 110 for separating plastic particles and dust-containing airflow, and a bag dust collector 120. The bag dust collector 120 is connected to the air outlet of the cyclone dust collector 110 through a pipe, and can separate dust in the airflow to achieve the enrichment and treatment of airborne dust.

[0062] In the specific implementation process, the cyclone dust collector 110 is a device that uses centrifugal force to achieve gas-solid separation. Specifically, it can be implemented with a structure with a conical cylinder and a tangential air inlet. After the dust-laden airflow enters tangentially, it forms a rotating flow field. Due to its large mass, the plastic particles are thrown against the wall and fall down for collection, while the lighter dust rises with the airflow.

[0063] Among them, the bag filter 120 refers to a device that filters dust through fiber filter bags. Specifically, filter bags made of polyester or glass fiber can be used. When the dust-laden airflow passes through the filter bag, the dust is blocked on the outer surface of the filter bag, and clean air is discharged from the inside of the filter bag.

[0064] During operation, plastic particles and dust-laden airflow undergo primary separation within the cyclone dust collector 110. The plastic particles enter the coating process through the bottom particle outlet, while the airflow carrying residual dust enters the bag filter 120 through the top outlet of the cyclone dust collector 110. In the bag filter 120, as the airflow passes through multiple layers of filter bags, smaller dust particles are intercepted by the filter bag fibers, and clean air is ultimately discharged into the atmosphere. The two-stage dust collection devices form a series structure, with the cyclone dust collector 110 prioritizing the removal of large particles, and the bag filter 120 performing deep filtration for fine dust.

[0065] In some embodiments, please refer to Figure 1 and Figure 2 The top of the coating box 210 is connected to the particle output port of the cyclone dust collector 110 through a pipe. The cyclone dust collector 110 can rotate and disperse the plastic particles, so that the plastic particles are relatively dispersed in the coating box 210, thereby promoting the spray coating of different plastic particles by the spray head.

[0066] In the specific process fourteen, the connection between the top of the coating box 210 and the particle outlet of the cyclone dust collector 110 via a pipe means that the inlet of the coating box 210 and the particle outlet of the cyclone dust collector 110 are directly connected through a sealed pipe. Specifically, a flange or clamp-type interface can be used to achieve the pipe connection, ensuring that the plastic particles directly enter the coating box 210 after being separated from the cyclone dust collector 110. The ability of the cyclone dust collector 110 to rotate and disperse the plastic particles means that after the cyclone dust collector 110 separates the plastic particles from the dust in the dust-laden airflow using centrifugal force, the rotating airflow causes the plastic particles to fall evenly. This can be achieved by adjusting the angle of the internal guide plate or the airflow speed of the cyclone dust collector 110, thereby promoting the dispersion of the plastic particles.

[0067] Specifically, during the separation of plastic particles and dust, the cyclone dust collector 110 uses rotating airflow to evenly disperse and downwardly transport the particles. After entering the top of the coating chamber 210 through the pipe, the particles naturally fall to the coating area due to gravity. The spray unit 220 inside the coating chamber 210 coats the falling particles, and the rotating dispersion effect of the cyclone dust collector 110 prevents uneven coating caused by local accumulation of particles upon entering the coating chamber 210. In addition, the airtightness of the pipe connections reduces secondary pollution from external dust, ensuring that the particles are thoroughly dust-free before coating.

[0068] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A centralized feeding system for the production of medical caps, characterized in that, include: The dust removal unit, coating unit, and material distribution unit are connected sequentially by pipes. The dust removal assembly is used to separate plastic particles and dust. The coating assembly includes a coating box and a spray unit. The spray unit is disposed in the coating box and can spray liquid mist into the coating box to coat the plastic particles, so as to prevent the plastic particles from generating dust again. The input end of the coating box is connected to the particle outlet of the dust removal assembly. The material distribution assembly includes a centralized discharge hopper and a material distribution unit. The input end of the centralized discharge hopper is connected to the output end of the coating box to centrally distribute the coated plastic granules. The material distribution unit includes an adapter. The input end of the adapter is connected to the centralized discharge hopper, and the multiple output ends of the adapter are respectively connected to different injection molding machines through pipes.

2. The centralized feeding system for the production of medical caps according to claim 1, characterized in that, The spray unit includes multiple vertically upward-mounted atomizing heads, which can spray upwards onto the plastic particles falling downwards, causing a coating to adhere to the surface of the plastic particles.

3. The centralized feeding system for the production of medical caps according to claim 2, characterized in that, Multiple sets of the spray units are arranged at equal intervals along the vertical direction.

4. The centralized feeding system for medical cap production according to claim 3, characterized in that, The coating assembly further includes a liquid circulation unit, which includes a storage tank for storing the coating solution and a liquid circulation pipeline. The two ends of the liquid circulation pipeline are respectively connected to the bottom of the coating tank and the atomizing head, and the middle part of the liquid circulation pipeline is connected to the storage tank. The storage tank can draw up the coating solution accumulated at the bottom of the coating tank and deliver the coating solution to the atomizing head.

5. The centralized feeding system for the production of medical caps according to claim 1, characterized in that, The bottom of the coating tank is equipped with a solid-liquid separation unit, which includes an inclined separation net that can separate plastic particles from the coating liquid and guide the plastic particles to gather to one side.

6. The centralized feeding system for the production of medical caps according to claim 1, characterized in that, The material distribution unit also includes an adapter with multiple interconnected interfaces. One interface of the adapter is connected to the bottom of the centralized discharge hopper via a pipe to siphon plastic granules. The other interfaces of the adapter are connected to multiple injection molding machines via pipes to convey coated granules from the centralized discharge hopper.

7. A centralized feeding system for the production of medical caps according to claim 1, characterized in that, The dust removal assembly includes a cyclone dust collector for separating plastic particles and dust-containing airflow, and a bag filter dust collector. The bag filter dust collector is connected to the outlet of the cyclone dust collector through a pipe to separate dust from the airflow.

8. A centralized feeding system for the production of medical caps according to claim 7, characterized in that, The top of the coating box is connected to the particle output port of the cyclone dust collector via a pipe, and the cyclone dust collector is capable of rotating and dispersing plastic particles.

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