Plastic sheet hot air drying device

Abstract

This utility model provides a hot air drying device for plastic sheets, including a main housing. A hot air drying unit is installed on the top of the main housing and is connected to the main housing. Multiple trays are arranged inside the main housing for placing plastic sheets. A tilting assembly acting on the trays is also provided inside the main housing. The tilting assembly includes a base, a loading platform slidably mounted on the base, and a connecting rod swayably mounted on the loading platform, connected to the trays. A guide groove is also provided on the base, and one end of the connecting rod is connected to a sliding part via a swing plate, the sliding part being slidably positioned within the guide groove. The tilting assembly causes the trays to swing back and forth at large angles, effectively solving the drying dead zone problem caused by the stacking and sticking of plastic sheets, significantly improving drying quality and pass rate. By flipping the trays to a vertical position and combining this with the high-frequency vibration generated by the actuating wheel, rapid and thorough automated unloading is achieved, greatly improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of plastic sheet drying, specifically a hot air drying device for plastic sheets. Background Technology

[0002] Plastic sheets, especially PET sheets, need to be hot-air dried after recycling, cleaning or preparation to remove residual moisture and ensure their quality and performance in subsequent melt processing and product molding.

[0003] Traditional hot air drying equipment for plastic sheets typically employs a layered drawer-type structure, placing the plastic sheets on fixed or simply horizontally moving mesh plates for drying. This drying method suffers from significant drying dead zones. Due to heat or static electricity, the plastic sheets tend to stack and stick together, resulting in uneven material density and making it difficult for hot air to penetrate the entire material pile evenly. Especially for the plastic sheets at the bottom of the material layer or at the contact surface with the mesh plate, the lack of effective turning creates drying dead zones, leading to incomplete moisture removal and severely impacting the final product's yield and drying efficiency.

[0004] Although existing technologies have attempted to introduce a turning structure, the linear, localized, and intermittent turning action has limited dispersing effect and is difficult to completely break up and separate the plastic sheets that have become stuck together. It is also ineffective in eliminating the drying dead zones deep in the material accumulation.

[0005] Furthermore, existing equipment suffers from low efficiency in material feeding and collection after drying. The layered drawer-type structure requires operators or machinery to pull the entire container filled with the dried material out of the drying chamber and then empty it through a discharge port on the side of the container. This process presents several problems: firstly, it is cumbersome and inefficient, requiring multiple pulling and emptying actions, resulting in low automation. Moreover, frequent pulling and opening of the container may affect the airtightness and thermal stability of the hot air drying chamber.

[0006] In summary, existing hot air drying devices for plastic sheets suffer from problems such as drying dead zones, incomplete material dispersion, inconvenient post-drying material collection, and low efficiency, making it difficult to meet the requirements of industrial production for efficient, uniform drying and automated operation. Therefore, it is necessary to propose a new hot air drying device to effectively solve the above-mentioned technical problems. Utility Model Content

[0007] The purpose of this invention is to provide a hot air drying device for plastic sheets, which aims to solve the problems of uneven drying of plastic sheets, the existence of dead corners, and low automation and efficiency of material collection in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A hot air drying device for plastic sheets includes a main housing, a hot air drying unit installed on the top of the main housing, the hot air drying unit being connected to the main housing, multiple trays being provided inside the main housing for placing the plastic sheets, and a tilting assembly acting on the trays being provided inside the main housing. The tilting assembly includes a base, on which a loading platform is slidably disposed. A connecting rod is swayably disposed on the loading platform and connected to the pallet. The base is also provided with a guide groove, and one end of the connecting rod is connected to a sliding part via a swing plate. The sliding part is slidably disposed in the guide groove.

[0009] By adopting the above technical solution, the core of this device lies in the addition of a tumbling assembly. During the drying process, the loading platform slides horizontally on the base. Since one end of the connecting rod is connected to the swingable pallet, and the other end is constrained in the guide groove by the sliding part, the horizontal movement of the loading platform is transformed into a compound tumbling and flipping of the pallet through the synergistic action of the connecting rod and the guide groove. This design enables the plastic sheets on the pallet to generate a wide-range and continuous tumbling, effectively disrupting the stable structure of material accumulation, eliminating drying dead zones caused by stacking and adhesion, and allowing hot air to evenly contact all plastic sheets, thereby significantly improving the uniformity and efficiency of drying.

[0010] Preferably, a clamping head is further provided between the connecting rod and the pallet, the clamping head being slidably disposed on the connecting rod, and the clamping head including an abutment portion; a rotatable actuating wheel is further provided on the loading platform, the actuating wheel acting on the abutment portion.

[0011] Preferably, a return spring is provided between the loading platform and the clamping head.

[0012] This design aims to achieve efficient vibration feeding. During the feeding stage, the actuating wheel rotates, and its teeth or protrusions periodically actuate and impact the contact part of the clamping head. This impact force is transmitted to the pallet through the clamping head, causing the pallet to vibrate at high frequency. The return spring ensures that the clamping head can quickly return to its original position after being actuated, preparing for the next impact and creating a continuous vibration effect. This vibration effectively overcomes the electrostatic attraction and friction between the dried plastic sheets and between the plastic sheets and the pallet, allowing the material to be quickly and thoroughly removed from the pallet.

[0013] Preferably, a drive motor is mounted on the base, and a lead screw is mounted on the output end of the drive motor, which is threadedly connected to the loading platform. Through the combination of the drive motor and the lead screw, the sliding position, speed, and reciprocating motion of the loading platform can be precisely controlled, thereby precisely controlling the swing angle and frequency of the pallet, achieving automated and programmed control of the entire tilting and unloading process.

[0014] Preferably, the lower part of the main body is provided with a collection box for holding plastic sheets.

[0015] After drying and vibration feeding, the plastic sheets fall directly into the collection box below, achieving a seamless connection between drying and collection, simplifying the operation process, improving production efficiency, and maintaining the airtightness of the drying chamber.

[0016] Preferably, the hot air drying unit further includes a top air outlet and a side air outlet.

[0017] By setting up air outlets in multiple directions, a multi-directional, three-dimensional hot air circulation can be formed. Combined with the tilting of the tray, the contact between the hot air and the plastic sheet is further enhanced, avoiding the problem of local overheating or insufficient drying that may be caused by a single airflow direction, and further improving the uniformity of drying.

[0018] Compared with the prior art, the present invention has the following significant advantages: 1. Uniform and thorough drying: The oscillating component allows the pallet to swing back and forth at a large angle, effectively solving the problem of drying dead spots caused by the stacking and sticking of plastic sheets, and significantly improving the drying quality and pass rate.

[0019] 2. Highly efficient and automated material unloading: By flipping the pallet to a vertical position and combining it with the high-frequency vibration generated by the actuating wheel, fast and thorough automated material unloading is achieved, greatly improving production efficiency.

[0020] 3. Ingenious structure and high integration: It integrates the functions of tumbling drying and vibration feeding into one unit, with a compact structure, reasonable design, and easy industrial production and application. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the oscillating component swinging to 45 degrees in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the oscillating component swinging to 90 degrees in one embodiment of the present invention; Figure 4 This is a cross-sectional view of the tumbling assembly in one embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Main chamber; 2. Hot air drying unit; 3. Pallet; 4. Tilting assembly; 5. Base; 6. Loading platform; 7. Connecting rod; 8. Guide groove; 9. Sliding part; 10. Clamping head; 11. Abutting part; 12. Actuating wheel; 13. Return spring; 14. Drive motor; 15. Lead screw; 16. Collection box; 17. Top air outlet; 18. Side air outlet; 19. Swing plate. Detailed Implementation

[0024] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0025] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1 Please see Figures 1 to 4 This invention provides a hot air drying device for plastic sheets, including a main housing 1. A hot air drying unit 2 is installed on the top of the main housing 1. The hot air drying unit 2 communicates with the interior of the main housing 1 through a top air outlet 17 and a side air outlet 18 to form a circulating hot air system. Multiple layers of trays 3 are provided inside the main housing 1. The trays 3 are typically mesh or perforated to allow hot air penetration and are used to hold the plastic sheets to be dried. A collection box 16 is provided at the bottom of the main housing 1 for collecting the dried plastic sheets.

[0027] The core of this invention lies in the fact that a tilting assembly 4 acting on each layer of pallets 3 is provided inside the main housing 1. Each tilting assembly 4 includes a fixed base 5. A drive motor 14 is mounted on the base 5, and a lead screw 15 is connected to the output end of the drive motor 14. A loading platform 6 is connected to the lead screw 15 via a threaded pair, thereby allowing it to slide precisely horizontally along the lead screw 15 on the base 5 under the drive of the drive motor 14.

[0028] A connecting rod 7 is oscillatingly mounted on the loading platform 6 via a pivot, and the other end of the connecting rod 7 is connected to the corresponding support plate 3. A guide groove 8 of a specific shape is provided on the base 5. A sliding part 9 is connected to one end of the connecting rod 7 near the loading platform 6 via a swing plate 19, and the sliding part 9 can slide within the guide groove 8.

[0029] During the drying stage, the drive motor 14 is controlled to rotate in both directions, driving the loading table 6 to reciprocate linearly on the lead screw 15. As the loading table 6 moves, the connecting rod 7 on it also moves accordingly. Simultaneously, the sliding part 9 on the connecting rod 7 is constrained within the guide groove 8. This constraint converts the horizontal movement of the loading table 6 into the reciprocating oscillation of the pallet 3 via the connecting rod 7. By rationally designing the curve shape of the guide groove 8, a smooth and continuous oscillation of the pallet 3 between 0 and 45 degrees can be achieved (e.g., ...). Figure 2 (As shown). The plastic sheet is continuously turned and tossed on the tray 3, and hot air is blown out from the top air outlet 17 and the side air outlet 18, exchanging heat with the fully agitated plastic sheet, thereby achieving rapid and uniform drying.

[0030] To achieve efficient automatic unloading, a clamping head 10 is provided between the connecting rod 7 and the pallet 3. The clamping head 10 can slide within a small range along the direction of the connecting rod 7 and includes an abutment portion 11. A return spring 13 is connected between the loading table 6 and the clamping head 10 to hold the clamping head 10 in its initial position. An independently motor-driven actuating wheel 12 is also installed on the loading table 6. The edge of the actuating wheel 12 has protrusions that face the abutment portion 11 of the clamping head 10.

[0031] During the unloading stage, firstly, the drive motor 14 drives the loading table 6 to a limit position. At this time, through the mechanism of the connecting rod and guide groove, the pallet 3 is flipped to a 90-degree vertical state (e.g., Figure 3 (As shown). Then, the actuating wheel 12 is activated. The actuating wheel 12 rotates at high speed, and the protrusions on it continuously impact the abutment part 11 of the clamping head 10, compressing the return spring 13. After the impact force disappears, the return spring 13 quickly springs the clamping head 10 back. This cycle repeats, causing the clamping head 10 to drive the tray 3 to generate high-frequency vibration. Under the combined action of gravity and vibration, the dry plastic sheet will quickly fall off the tray 3 and fall into the collection box 16 below, completing the automatic unloading process.

[0032] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A hot air drying device for plastic sheets, comprising a main housing, a hot air drying unit installed on the top of the main housing, the hot air drying unit being connected to the main housing, and multiple layers of trays provided inside the main housing for placing the plastic sheets; characterized in that: The main housing is equipped with a tilting assembly that acts on the tray; The tilting assembly includes a base, on which a loading platform is slidably disposed. A connecting rod is swayably disposed on the loading platform and connected to the pallet. The base is also provided with a guide groove, and one end of the connecting rod is connected to a sliding part via a swing plate. The sliding part is slidably disposed in the guide groove.

2. The plastic sheet hot air drying apparatus according to claim 1, wherein A clamping head is also provided between the connecting rod and the support plate. The clamping head is slidably disposed on the connecting rod and includes an abutment portion. The loading platform is also equipped with a rotatable actuating wheel, which acts on the abutting part.

3. The plastic sheet hot air drying apparatus according to claim 2, wherein A return spring is provided between the loading platform and the clamping head.

4. The plastic sheet hot air drying apparatus according to claim 1, wherein A drive motor is mounted on the base, and a lead screw is mounted on the output end of the drive motor. The lead screw is threadedly connected to the loading platform.

5. The plastic sheet hot air drying apparatus according to claim 1, wherein The lower part of the main body is provided with a collection box for holding plastic sheets.

6. The plastic sheet hot air drying apparatus according to claim 1, wherein The hot air drying unit also includes a top air outlet and a side air outlet.

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