Plastic pellet hopper dryer

Abstract

The utility model relates to a kind of plastic granules hopper drying machine, including material bucket, the top of the material bucket is provided with inlet and exhaust port, bottom is provided with discharge port, the inside of the material bucket is below inlet and is provided with the preheating hopper of vent hole, the bottom end of the preheating hopper is provided with electric gate valve, the inside of the material bucket is below preheating hopper and is provided with hot air pipeline, the air outlet of the hot air pipeline is located the inner bottom of material bucket, and the opening of air outlet is downward.The utility model is dried by "pre-drying+interval sprinkle drying+slowly accumulated drying", and the complete drying of plastic granule can be realized, and drying effect is good.

Description

Technical Field

[0001] This utility model relates to a plastic granule hopper dryer. Background Technology

[0002] Injection molding of plastic granules is a widely used processing technology in modern industry. By injecting molten plastic granules into a mold and allowing them to cool and solidify, various plastic products such as oil bottles can be manufactured efficiently. Drying the plastic granules before injection molding is a crucial pretreatment step—if the granules contain too much moisture, defects such as bubbles and silver streaks are easily generated during the injection molding process due to high temperatures, seriously affecting the mechanical properties and surface quality of the product. Therefore, plastic granule dryers, as the core equipment for removing moisture from the granules, directly determine the pass rate of subsequent injection-molded products and hold an important position in the plastics processing field.

[0003] Currently, commonly used plastic pellet dryers in industry mainly consist of a storage assembly, a hot air generation system, and an exhaust system. The core drying principle is the "hot air penetration drying method": the storage assembly, which serves as a temporary storage and drying chamber for plastic pellets, is usually a vertical cylindrical or square container with a hot air inlet at the bottom and an exhaust port at the top or side; the high-temperature dry air generated by the hot air generation system is blown from the bottom of the storage assembly upwards, contacting the plastic pellets accumulated inside. The hot air penetrates the gaps between the plastic pellets, and through heat exchange, it removes the moisture from the surface and inside of the pellets, finally discharging the humid air from the exhaust port, thus completing the drying process.

[0004] Although the aforementioned dryers can meet the drying requirements of plastic granules to a certain extent, in actual applications, after the plastic granules enter the storage component all at once, they all accumulate in the storage component before hot air penetration drying begins. At this time, due to the large thickness of the plastic granules, the hot air penetration path is extended, resulting in slow drying speed and incomplete drying in some areas. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a plastic granule hopper dryer.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a plastic granule hopper dryer, including a hopper, the top of which is provided with a feed inlet and an exhaust outlet, and the bottom of which is provided with a discharge outlet. Inside the hopper, below the feed inlet, is a preheating hopper with vent holes. The bottom of the preheating hopper is provided with an electric gate valve. Inside the hopper, below the preheating hopper, is a hot air duct. The outlet of the hot air duct is located at the bottom of the hopper, and the opening of the outlet faces downward.

[0007] Preferably, the preheating hopper includes a conical hopper body that is wider at the top and narrower at the bottom, and the peripheral wall of the conical hopper body is provided with a plurality of vent holes.

[0008] Preferably, the narrow opening at the bottom of the conical hopper is a material discharge port, and an electric gate valve is installed on the material discharge port.

[0009] Preferably, a feeder is provided inside the conical hopper to guide the plastic granules to the inner circumferential side of the conical hopper.

[0010] Preferably, the feeder includes a hollow upper conical cover and a lower conical cover, the tip of the upper conical cover facing upwards, the tip of the lower conical cover facing downwards, and the bottom of the upper conical cover and the top of the lower conical cover are connected.

[0011] Preferably, the surfaces of the upper conical cover and the lower conical cover are provided with a plurality of ventilation holes.

[0012] Preferably, a space is formed between the outer peripheral wall of the lower conical cover and the inner peripheral wall of the conical hopper to accommodate plastic particles.

[0013] Preferably, a plurality of radially extending support rods are uniformly fixed on the upper circumference of the outer periphery of the lower conical cover, and the support rods are used to contact and support a local area of ​​the inner peripheral wall of the conical hopper.

[0014] Preferably, the hot air duct is connected to a blower to generate hot air. The hot air duct extends vertically from top to bottom along the middle of the material barrel and has a horn-shaped air outlet at the bottom.

[0015] Preferably, the motor of the electric gate valve is installed on the outer peripheral wall of the hopper.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This plastic granule hopper dryer achieves step-by-step drying of plastic granules through a preheating hopper with ventilation holes inside the hopper, coupled with the intermittent opening and closing of an electric gate valve: pre-drying + intermittent spray drying + slow accumulation drying. Specifically, the plastic granules are first piled in the preheating hopper. When hot air is blown upwards from the bottom of the hopper, the hot air enters the preheating hopper through the ventilation holes and penetrates the gaps between the plastic granules to complete pre-drying (at this stage, the plastic granules are not completely dried). Then, the electric gate valve opens and closes intermittently, causing some plastic granules in the preheating hopper to be sprayed out in batches at regular intervals. These plastic granules are more fully exposed to the high-temperature dry air during their fall, and after falling to the bottom of the hopper, they continue to be exposed to hot air for drying and slowly accumulate. The thickness of the accumulation gradually increases from thin to thick, rather than the large, one-time accumulation found in existing technologies.

[0017] Compared with existing technologies, this invention achieves thorough drying of plastic granules through a step-by-step drying process of "pre-drying + intermittent spray drying + slow stacking drying," resulting in a better drying effect.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model.

[0020] Figure 2 This is a partial structural diagram of an embodiment of the present utility model.

[0021] Figure 3 This is a top view of the preheating hopper.

[0022] Figure 4 This is a top view of the feeder.

[0023] Figure 5 This is a schematic diagram of plastic pellets being sprinkled from a preheating hopper.

[0024] In the diagram: 1. Material bucket; 2. Inlet; 3. Vent; 4. Air vent; 5. Preheating hopper; 6. Electric gate valve; 7. Hot air duct; 8. Outlet; 9. Upper conical cover; 10. Lower conical cover; 11. Plastic pellets; 12. Support rod. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] like Figures 1-5 As shown, this embodiment provides a plastic granule hopper dryer, including a hopper 1. The top of the hopper is provided with a feed inlet 2 and an exhaust outlet 3, and the bottom is provided with a discharge outlet and a discharge switch valve. Inside the hopper, below the feed inlet, is a preheating hopper 5 with a vent 4. The bottom opening of the preheating hopper is provided with an electric gate valve 6. Inside the hopper, below the preheating hopper, is a hot air duct 7. The air outlet 8 of the hot air duct is located at the bottom of the hopper and the opening of the air outlet faces downward.

[0029] In this embodiment of the present invention, the preheating hopper includes a conical hopper body that is wider at the top and narrower at the bottom. A plurality of vent holes are provided on the peripheral wall of the conical hopper body, and the inner diameter of the vent holes is smaller than the particle size of the plastic pellets.

[0030] In this embodiment of the utility model, the narrow opening at the bottom of the conical bucket is a material discharge port, and an electric gate valve is installed on the material discharge port.

[0031] In this embodiment of the invention, a feeder is provided inside the conical hopper to guide plastic granules to the inner circumferential side of the conical hopper.

[0032] In this embodiment of the utility model, the feeder includes a hollow upper conical cover 9 and a lower conical cover 10. The tip of the upper conical cover faces upward, the tip of the lower conical cover faces downward, and the bottom of the upper conical cover and the top of the lower conical cover are connected as one piece.

[0033] In this embodiment of the invention, a plurality of ventilation holes are provided on the surfaces of the upper conical cover and the lower conical cover, and the inner diameter of the ventilation holes is smaller than the particle size of the plastic granules.

[0034] In this embodiment of the present invention, an intervening space is formed between the outer peripheral wall of the lower conical cover and the inner peripheral wall of the conical hopper to accommodate the plastic particles 11.

[0035] In this embodiment of the present invention, a plurality of radially extending support rods 12 are uniformly fixed on the upper circumference of the outer periphery of the lower conical cover, and the support rods are used to contact and support a local area of ​​the inner peripheral wall of the conical hopper.

[0036] In this embodiment of the utility model, the hot air duct is connected to a blower / hot air generating system to generate hot air. The hot air duct extends vertically from top to bottom along the middle of the material barrel and has a horn-shaped air outlet at the bottom.

[0037] In this embodiment of the utility model, the motor of the electric gate valve is installed on the outer peripheral wall of the material barrel.

[0038] In this embodiment of the invention, the plastic granule hopper dryer achieves step-by-step drying of plastic granules through "pre-drying + intermittent spray drying + slow accumulation drying" by adding a preheating hopper with ventilation holes inside the hopper and coordinating the intermittent opening and closing of an electric gate valve. Specifically, the plastic granules are first piled up in the preheating hopper. When hot air is blown from the bottom of the hopper upwards, the hot air enters the preheating hopper through the ventilation holes and penetrates through the gaps between the plastic granules to complete the pre-drying (at this time, the plastic granules are not completely dried). Then, the electric gate valve is opened and closed intermittently, causing some plastic granules in the preheating hopper to be sprayed out in batches at regular intervals. These plastic granules will come into more comprehensive contact with the high-temperature dry air during their fall, and when they fall to the bottom of the hopper, they will continue to be exposed to hot air for drying and slowly accumulate. The thickness of the accumulation gradually increases from thin to thick, rather than the large thickness accumulated at once in the prior art.

[0039] Compared with existing technologies, this invention achieves thorough drying of plastic granules through a step-by-step drying process of "pre-drying + intermittent spray drying + slow stacking drying," resulting in a better drying effect.

[0040] Furthermore, the feed inlet of this invention can also be connected to a negative pressure pneumatic conveying system, so that new plastic particles can be added when the amount of plastic particles in the preheating hopper decreases.

[0041] Furthermore, the upper conical cover of this invention guides the incoming plastic granules towards the inner circumferential region of the preheating hopper, causing the plastic granules to accumulate in the space formed between the outer circumferential wall of the lower conical cover and the inner circumferential wall of the conical hopper. The lower conical cover prevents plastic granules from accumulating in the central region of the preheating hopper, avoiding excessive accumulation that could impede the penetration of hot air. Moreover, both the upper and lower conical covers have ventilation holes, allowing hot air to penetrate more easily upwards to the exhaust port, which should be connected to the exhaust system.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A plastic granule hopper dryer, comprising a hopper, wherein the top of the hopper is provided with a feed inlet and an exhaust outlet, and the bottom is provided with a discharge outlet, characterized in that: Inside the material barrel, below the inlet, there is a preheating hopper with vent holes. The bottom of the preheating hopper is equipped with an electric gate valve. Inside the material barrel, below the preheating hopper, there is a hot air duct. The outlet of the hot air duct is located at the bottom of the inner part of the material barrel, and the opening of the outlet faces downward.

2. The plastic granule hopper dryer according to claim 1, characterized in that: The preheating hopper includes a conical hopper body that is wider at the top and narrower at the bottom, and a number of ventilation holes are provided on the peripheral wall of the conical hopper body.

3. The plastic granule hopper dryer according to claim 2, characterized in that: The narrow opening at the bottom of the conical bucket is the material discharge port, and an electric gate valve is installed on the material discharge port.

4. The plastic granule hopper dryer according to claim 2, characterized in that: The cone-shaped hopper is equipped with a feeder inside, which guides the plastic granules to the inner circumferential side of the cone-shaped hopper.

5. The plastic granule hopper dryer according to claim 4, characterized in that: The feeder includes a hollow upper conical cover and a lower conical cover, with the tip of the upper conical cover pointing upwards and the tip of the lower conical cover pointing downwards, and the bottom of the upper conical cover is connected to the top of the lower conical cover.

6. The plastic granule hopper dryer according to claim 5, characterized in that: Several ventilation holes are provided on the surfaces of the upper and lower conical covers.

7. The plastic granule hopper dryer according to claim 5, characterized in that: The outer peripheral wall of the lower conical cover and the inner peripheral wall of the conical hopper form a space for accommodating plastic particles.

8. The plastic granule hopper dryer according to claim 5, characterized in that: Several radially extending support rods are uniformly fixed on the upper circumference of the outer periphery of the lower conical cover. The support rods are used to contact and support a local area of ​​the inner peripheral wall of the conical hopper.

9. The plastic granule hopper dryer according to claim 1, characterized in that: The hot air duct is connected to a blower to generate hot air. The hot air duct extends vertically from top to bottom along the middle of the material barrel and has a horn-shaped air outlet at the bottom.

10. The plastic granule hopper dryer according to claim 3, characterized in that: The motor of the electric gate valve is installed on the outer peripheral wall of the hopper.

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