Plastic particle drying machine for detecting water content of modified plastic

Abstract

The plastic particle drying machine comprises a drying box and two side plates fixed to an inner cavity of the drying box, the upper portion of the side plate on the left side communicates with a feeding pipeline, the bottom of the side plate on the right side communicates with a discharging pipeline, and one side of each side plate is fixedly connected with two symmetrically-arranged fixed screen drums; the invention relates to the technical field of plastic particle drying. According to the plastic particle drying machine for detecting the water content of the modified plastic, hot air is blown out in the radial direction from an air outlet pipe through an air outlet hole through an annular material baking space and must penetrate through a plastic particle layer which is driven by a rotary screen drum and continuously turned over by a material pushing plate, and the mode that radial penetrating airflow is matched with axial material turning over is adopted; hot air is forced to be in sufficient and uniform contact with each plastic particle, so that hot air short circuit and particle agglomeration are effectively broken, and the heat exchange efficiency and the drying uniformity are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of plastic granule drying technology, specifically a plastic granule dryer for detecting the moisture content of modified plastics. Background Technology

[0002] In the production and quality inspection process of modified plastics, the moisture content of plastic granules is a key indicator affecting their processing performance, such as injection molding and extrusion, as well as the quality of final products, such as avoiding bubbles and silver streaks. Therefore, plastic granules must be precisely dried before leaving the factory or before conducting key performance tests to achieve extremely low moisture content requirements. Traditional plastic granule drying equipment, such as hot air circulating ovens or rotary drum dryers, generally suffers from the following problems: First, granules tend to accumulate in a static or simple tumbling state, making it difficult for hot air to penetrate the material layer, resulting in uneven drying, with the surface layer being too dry while the inner layer remains damp; second, the dried water vapor easily condenses on the inner wall of the equipment or on the surface of the granules, causing secondary damping or requiring a complex dehumidification system; third, most equipment cannot monitor the humidity changes of the material environment in real time and in situ during the drying process, and the drying endpoint often relies on experience or fixed time to determine, which may lead to energy waste or insufficient drying.

[0003] Therefore, there is an urgent need in this field for an integrated drying device that can achieve dynamic and uniform heating of plastic particles, efficient discharge and collection of moisture, and real-time feedback on the drying process, in order to meet the needs of the modified plastics industry for efficient, precise and energy-saving drying processes. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a modified plastic moisture content detection plastic granule dryer, which solves the problems mentioned above.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a modified plastic moisture content detection plastic granule dryer, comprising a drying chamber and two side plates fixed in the inner cavity of the drying chamber. The upper part of the left side plate is connected to a feed pipe, and the bottom of the right side plate is connected to a discharge pipe. Two symmetrically arranged fixed screen cylinders are fixedly connected to one side of each of the two side plates. A rotating screen cylinder located at the center of the fixed screen cylinder is rotatably connected to one side of each of the two side plates through a drive mechanism. Multiple annular array pusher plates are fixedly connected to the surface of the rotating screen cylinder. The drying oven has an air outlet pipe that extends through the inner cavity of the rotating screen cylinder and connects to the external hot air blower. The air outlet pipe has multiple air outlet holes on the surface of the inner cavity of the rotating screen cylinder. A water vapor sensor is fixedly connected to the inner cavity of the fixed screen cylinder.

[0006] As a further aspect of the present invention: the driving mechanism includes a driving gear that is rotatably connected to the side plate surface by a motor, and the inner cavity of the rotating screen cylinder is provided with a tooth path that meshes with the driving gear.

[0007] As a further aspect of the present invention: A ring-shaped steel wire mesh is fixedly connected to one side of each of the two side plates. An absorbent mesh, annularly wrapped around the surface of the fixed screen cylinder, is fixedly connected to the inner wall of the ring-shaped steel wire mesh. Plastic is added to the space between the rotating screen cylinder and the fixed screen cylinder through the feeding pipe. A hot air blower blows hot air into the air outlet pipe, and the air exits through the air outlet, passing through the holes of the rotating screen cylinder and entering the fixed screen cylinder to dry the plastic particles inside. At this time, the motor drives the drive gear to rotate, causing the rotating screen cylinder to rotate and driving the pusher plate to push the plastic particles inside the fixed screen cylinder back and forth for hot air baking. When the plastic is broken up, the internal moisture is blown out. After drying, the plastic is output through the discharge pipe.

[0008] As a further aspect of the present invention: the two side plates, the fixed screen cylinder, and the rotating screen cylinder constitute a baking space for processing plastic particles.

[0009] As a further aspect of the present invention: a connecting ring is rotatably connected between the two fixed screen cylinders. The outer ring of the connecting ring is fixedly connected to a pressing roller that squeezes the water absorption net through a connecting rod. The side of the pusher plate is fixedly connected to the inner ring of the connecting ring. When the rotating screen cylinder drives the pusher plate to rotate, it drives the connecting ring to rotate, which in turn drives the pressing roller to rotate and squeeze the water absorption net. The water vapor absorbed by the water absorption net is squeezed to the outside and flows down along the annular wire mesh for collection and treatment. The internal hot gas can be recycled after absorbing water vapor, and the water vapor can be automatically discharged.

[0010] Compared with the prior art, the present invention has the following advantages: Dynamic, uniform, and highly efficient hot air drying is achieved through an innovative coaxial double-screen cylinder structure—an outer fixed screen cylinder and an inner rotatable rotating screen cylinder—forming a ring-shaped material drying space. Hot air is blown radially from the air outlet through the air vents, and must pass through a layer of plastic granules that are constantly turned over by the pusher plate driven by the rotating screen cylinder. This "radial penetrating airflow" combined with "axial material turning" mode forces the hot air to fully and evenly contact each plastic granule, effectively breaking the problems of hot air short-circuiting and granule clumping, and greatly improving heat exchange efficiency and drying uniformity.

[0011] It integrates an active moisture collection and discharge mechanism: a water-absorbing net installed on the outside of the baking space effectively absorbs water vapor carried by the hot air, preventing it from condensing and flowing back. More ingeniously, the rotational motion of the pusher plate is transmitted to the extrusion rollers via a connecting ring. As the material tumbles, the extrusion rollers rotate synchronously and continuously squeeze the water-absorbing net, mechanically expelling the absorbed liquid water, which is then collected and discharged. This design achieves real-time, active removal of moisture during the drying process, maintaining a low humidity environment within the baking space, accelerating the drying rate, and reducing the humidity of the treated hot air, which is beneficial for improving energy efficiency through recycling.

[0012] It possesses in-situ, real-time drying process monitoring capabilities: a moisture sensor is directly installed inside the fixed screen cylinder, enabling real-time monitoring of the ambient humidity of the material. This data provides a direct basis for judging the drying process, avoiding energy waste or over-drying due to excessively long fixed drying times, and also preventing incomplete drying due to insufficient time. The sensor data can be linked with the control system to achieve intelligent closed-loop control of the drying process, ensuring that different batches of materials achieve a stable and consistent final moisture content.

[0013] Compact structure, integrated functions, and reliable operation: The drive, drying, turning, and dehumidification functions are highly integrated into a sealed module consisting of side plates, a fixed screen cylinder, and a rotating screen cylinder. The meshing transmission between the drive gear and the internal gear circuit of the rotating screen cylinder ensures structural stability and direct power transmission. The entire device achieves continuous or batch operation through inlet and outlet pipes, with a high degree of automation, easy integration into production lines, and relatively centralized maintenance points. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention.

[0015] In the diagram: 1. Drying box; 2. Fixed screen cylinder; 3. Rotating screen cylinder; 4. Pusher plate; 5. Connecting ring; 6. Extrusion roller; 7. Feed pipe; 8. Discharge pipe; 9. Side plate; 10. Air outlet pipe; 11. Air outlet; 12. Drive gear; 13. Annular wire mesh; 14. Water absorption mesh. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0017] Please see Figure 1-2The present invention provides a technical solution: a modified plastic moisture content detection plastic granule dryer, including a drying box 1 and two side plates 9 fixed in the inner cavity of the drying box 1. The upper part of the left side plate 9 is connected to a feeding pipe 7, and the bottom of the right side plate 9 is connected to a discharging pipe 8. Two symmetrically arranged fixed screen cylinders 2 are fixedly connected to one side of each of the two side plates 9. A rotating screen cylinder 3 located at the center of the fixed screen cylinder 2 is rotatably connected to one side of each of the two side plates 9 through a driving mechanism. Multiple annular array pusher plates 4 are fixedly connected to the surface of the rotating screen cylinder 3. The inner cavity of the drying oven 1 is permeated by an air outlet pipe 10 that extends into the inner cavity of the rotating screen cylinder 3 and connects to an external hot air blower. The air outlet pipe 10 is provided with multiple air outlet holes 11 on the surface of the inner cavity of the rotating screen cylinder 3. A water vapor sensor is fixedly connected to the inner cavity of the fixed screen cylinder 2.

[0018] The drive mechanism includes a drive gear 12 that is rotatably connected to the side plate 9 via a motor, and the inner cavity of the rotating screen cylinder 3 is provided with a tooth path that meshes with the drive gear 12.

[0019] Both side plates 9 are fixedly connected to annular wire mesh 13 on opposite sides. The inner wall of the annular wire mesh 13 is fixedly connected to a water-absorbing mesh 14 that covers the surface of the fixed screen cylinder 2. Plastic is added into the space between the rotating screen cylinder 3 and the fixed screen cylinder 2 through the feed pipe 7. The hot air blows hot air into the air outlet pipe 10 and blows it out through the air outlet 11. It passes through the gap of the rotating screen cylinder 3 and enters the fixed screen cylinder 2 to dry the plastic particles in the fixed screen cylinder 2. At this time, the motor drives the drive gear 12 to rotate, the rotating screen cylinder 3 rotates, and drives the pusher plate 4 to push the plastic particles in the fixed screen cylinder 2 to move back and forth for hot air baking. When the plastic is broken up, the internal water vapor is blown out. After drying, it is output through the discharge pipe 8.

[0020] The two side plates 9, the fixed screen cylinder 2, and the rotating screen cylinder 3 form a baking space for processing plastic granules.

[0021] A connecting ring 5 is rotatably connected between two fixed screen cylinders 2. The outer ring of the connecting ring 5 is fixedly connected to a pressing roller 6 that presses against the water absorption net 14 via a connecting rod. The side of the pusher plate 4 is fixedly connected to the inner ring of the connecting ring 5. When the rotating screen cylinder 3 drives the pusher plate 4 to rotate, it drives the connecting ring 5 to rotate, which in turn drives the pressing roller 6 to rotate and press against the water absorption net 14. The water vapor absorbed by the water absorption net 14 is squeezed to the outside and flows down along the annular wire mesh 13 for collection and treatment. The internal hot gas can be recycled after absorbing water vapor, and the water vapor can be automatically discharged.

[0022] In use, the first stage of this invention is feeding and initial setup. The modified plastic granules to be dried are fed into the dryer through the feed pipe 7, and the granules fall into the starting end of the annular baking space formed by the left side plate 9, the fixed screen cylinder 2, and the rotating screen cylinder 3. The material naturally fills the annular gap between the fixed screen cylinder 2 and the rotating screen cylinder 3.

[0023] Phase Two: Hot Air Drying and Dynamic Turning An external hot air blower is activated, continuously pumping dry, hot air into the air outlet duct 10 that runs through the drying chamber 1 and the rotating screen cylinder 3. The hot air is radially ejected from the air outlet 11 located inside the rotating screen cylinder. Simultaneously, the drive motor starts, driving the drive gear 12 to rotate. The gear meshes with the teeth on the inner wall of the rotating screen cylinder 3, driving the entire rotating screen cylinder 3 to rotate slowly. Multiple pusher plates 4 fixed to the outer wall of the rotating screen cylinder 3 rotate accordingly, continuously turning, lifting, and conveying the plastic granules within the annular gap like spiral blades. The hot air penetrates the constantly agitated and loosened granule layer, removing moisture from the surface of the granules, achieving efficient drying.

[0024] Phase 3: Moisture adsorption and mechanical dehumidification Hot, humid air containing a large amount of water vapor penetrates the material layer and reaches the outer space of the fixed screen cylinder 2. The annular wire mesh 13 and the water-absorbing mesh 14 covering its inner wall condense and absorb the moisture in the hot, humid air. As the rotating screen cylinder 3 rotates, the fixed connection between the connecting ring 5 and the pusher plate 4 drives the pressure roller 6 on the outer ring of the connecting ring 5 to rotate synchronously. The rotating pressure roller 6 rolls against the water-absorbing mesh 14, squeezing out the liquid water absorbed inside the mesh. The squeezed-out water flows down the annular wire mesh 13 to a collection tank (not shown in the diagram), which can be placed at the bottom to achieve continuous separation and discharge of water. The humidity of the dehumidified air is reduced, and some of it can participate in the circulation to save energy.

[0025] Phase 4: Process Monitoring and Discharge A moisture sensor installed inside the fixed screen cylinder 2 continuously monitors the humidity of the gas in the baking space. When the humidity value drops to a preset qualified threshold and remains stable, it indicates that the granules have been dried to the target moisture content. The control system can then determine the drying endpoint based on this. After drying is complete, the plastic granules, continuously pushed by the pusher plate 4, finally reach the end of the baking space and are discharged through the discharge pipe 8 on the right side, entering the next process or the moisture content detection stage.

[0026] Phase 5: Cycling and Standby After drying one batch of materials, the hot air input can be stopped, and the drive mechanism can continue to run briefly to clear any remaining particles from the cavity. The device then enters standby mode, ready for the next batch. The entire system achieves automated operation of drying, dehumidification, and monitoring.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A modified plastic moisture content detection plastic particle dryer, comprising a drying box (1) and two side plates (9) fixed in the inner cavity of the drying box (1), a feeding pipe (7) is communicated above the left side plate (9), and a discharging pipe (8) is communicated at the bottom of the right side plate (9), characterized in that: Two symmetrically arranged fixed screen cylinders (2) are fixedly connected to one side of each of the two side plates (9), and a rotating screen cylinder (3) located at the center of the fixed screen cylinder (2) is rotatably connected to one side of each of the two side plates (9) through a driving mechanism. Multiple annular array pusher plates (4) are fixedly connected to the surface of the rotating screen cylinder (3). The inner cavity of the drying oven (1) is permeated by an air outlet pipe (10) that extends into the inner cavity of the rotating screen cylinder (3) and connects to an external hot air blower. The air outlet pipe (10) has multiple air outlet holes (11) on the surface of the inner cavity of the rotating screen cylinder (3). A water vapor sensor is fixedly connected to the inner cavity of the fixed screen cylinder (2).

2. The modified plastic moisture content detection plastic granule dryer according to claim 1, characterized in that: The drive mechanism includes a drive gear (12) that is rotatably connected to the side plate (9) via a motor drive, and the inner cavity of the rotating screen cylinder (3) is provided with a tooth path that meshes with the drive gear (12).

3. The modified plastic moisture content detection plastic granule dryer according to claim 1, characterized in that: Both of the two side plates (9) are fixedly connected to annular wire mesh (13) on opposite sides, and the inner wall of the annular wire mesh (13) is fixedly connected to an annular absorbent mesh (14) covering the surface of the fixed screen cylinder (2).

4. The modified plastic moisture content detection plastic granule dryer according to claim 1, characterized in that: The two side plates (9), the fixed screen cylinder (2), and the rotating screen cylinder (3) form a baking space for processing plastic granules.

5. The modified plastic moisture content detection plastic granule dryer according to claim 3, characterized in that: A connecting ring (15) is rotatably connected between the two fixed screen cylinders (2). The outer ring of the connecting ring (15) is fixedly connected to the extrusion roller (6) that is pressed against the water absorption net (14) by a connecting rod. The side of the pusher plate (4) is fixedly connected to the inner ring of the connecting ring (15).

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