A polyester bottle flake production apparatus
By heating and softening the plastic bottles before crushing and then crushing them in the softened state, the problem of irregular fragments and dust caused by room temperature crushing is solved, and efficient and low-energy-consumption recycled polyester bottle flake production is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIAONING HAORUN ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
- Filing Date
- 2026-05-12
- Publication Date
- 2026-06-12
Smart Images
Figure CN122185447A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of plastic bottle crushing, and more specifically, to a device for producing recycled polyester bottle flakes. Background Technology
[0002] In the production of recycled polyester bottle flakes, the crushing process of waste plastic bottles usually adopts a room temperature mechanical crushing method.
[0003] When plastic bottles are brittlely crushed at room temperature, irregular fragments, burrs, and dust are easily generated, resulting in poor dimensional uniformity of recycled polyester bottle flakes and affecting subsequent washing, drying, and granulation processes. Therefore, we propose a recycled polyester bottle flake production equipment. Summary of the Invention
[0004] This invention provides a recycled polyester bottle flake production equipment, which solves the technical problem in related technologies that plastic bottles are prone to irregular fragments, burrs, and dust during room temperature brittle crushing, resulting in poor dimensional uniformity of recycled polyester bottle flakes and affecting subsequent washing, drying, and granulation processes.
[0005] The present invention provides a recycled polyester bottle flake production equipment, comprising: a plastic bottle crusher, the plastic bottle crusher having a crushing chamber, and a crushing immersion module provided at the bottom of the crushing chamber; The crushing and immersion module includes a folded liquid storage basin, a heating module, a lifting control module, and a discharge module; The folded liquid storage basin is located at the bottom of the grinding chamber. The inside of the folded liquid storage basin is pre-filled with liquid. The heating module is located inside the folded liquid storage basin to heat the liquid to 70°C to 80°C. The lifting control module is located at the bottom of the folding liquid storage basin and is used to drive the folding liquid storage basin to move up and down in the vertical direction. The discharge module includes a receiving conveyor belt with several mesh holes. The receiving conveyor belt is located at the bottom of the crushing chamber and above the folded liquid storage basin, and is used to carry the waste plastic bottles poured into the crushing chamber. The crushing and immersion module is configured such that after the waste plastic bottle is poured into the crushing chamber and carried by the receiving conveyor belt, the lifting control module drives the folding liquid storage basin to move upward, so that the hot liquid of 70°C to 80°C in the folding liquid storage basin flows upward through the mesh of the receiving conveyor belt and enters the crushing chamber to immerse the waste plastic bottle. After immersion for a preset time, the lifting control module drives the folding liquid storage basin to move downwards, causing the hot liquid to retract. At the same time, the plastic bottle crusher crushes the softened waste plastic bottles, turning them into flakes while they are still in a softened state.
[0006] Furthermore, the discharge module also includes a sheet discharge box, which is fixed to the side wall of the plastic bottle crusher and is Z-shaped. The discharge box has a rotating discharge conveyor belt inside, and the connecting end of the discharge conveyor belt is connected to a drive motor to drive the discharge conveyor belt and the receiving conveyor belt.
[0007] Furthermore, the receiving conveyor belt is located in the lower part of the Z-shape of the output box, and the output conveyor belt is located in the upper part of the Z-shape of the output box. The receiving conveyor belt and the output conveyor belt are connected to each other, and the plastic sheets received on the receiving conveyor belt are transferred to the output conveyor belt.
[0008] Furthermore, a partition plate is installed below the receiving conveyor belt, which divides the crushing chamber of the plastic bottle crusher into upper and lower parts. The folded liquid storage basin is located below the partition plate and is fixedly and sealed to the partition plate. The center of the partition plate is hollowed out.
[0009] Furthermore, the outer wall of the receiving conveyor belt is arrayed with receiving flexible plates, and the receiving flexible plates are provided with mesh holes. The receiving flexible plates are bracket-shaped and the bending direction is the same as the rotation direction of the receiving flexible plates, which are used to scrape plastic bottle shreds from the hot liquid.
[0010] Furthermore, the folding liquid storage basin consists of three parts: a rigid basin bottom, a constricting basin waist, and supporting metal wires. The rigid basin bottom is located at the bottom, the constricting basin waist is fixed on the rigid basin bottom, and several supporting metal wires are embedded in the wall panel of the constricting basin waist. The top of the constricting basin waist is fixedly connected to the partition plate.
[0011] Furthermore, the heating module is embedded in the inner bottom wall of the rigid basin, and a temperature detection module is also fixedly installed in the inner bottom wall of the rigid basin to detect the temperature of the liquid in the folded liquid storage basin in real time, so that the heating module can adjust the temperature of the liquid in real time.
[0012] Furthermore, a lifting plate is fixedly installed at the bottom of the hard basin, an electric push rod is installed below the lifting plate, a pressure-bearing base plate is installed below the electric push rod, and the pressure-bearing base plate is fixedly connected to the support leg of the plastic bottle crusher.
[0013] Furthermore, the telescopic arm of the electric push rod is fixedly connected to the lifting plate to control the lifting and lowering of the lifting plate and the retraction and extension of the folding liquid storage basin. When the lifting plate rises, it pushes the waist of the shrink basin to retract into the bottom of the hard basin, so that the hot liquid can immerse the grinding chamber upward.
[0014] Furthermore, the upper wall of the pressure-bearing base plate is also provided with guide columns, which are distributed on both sides of the electric push rod and pass through the lifting plate, so that the lifting plate can slide up and down along the guide columns.
[0015] The beneficial effects of this invention are as follows: This invention heats the liquid in a folded storage basin to 70°C–80°C using a heating module, and then immerses the waste plastic bottles through the mesh of a conveyor belt, allowing the bottles to soften sufficiently to their glass transition temperature range before crushing. The material transitions from a glassy state to a highly elastic state, reducing its fracture toughness and critical fracture stress. This reduces the shearing force required by the plastic bottle crusher by 30%–50%, significantly lowering crushing energy consumption. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall left-side structure of the present invention; Figure 3 This is a schematic diagram of the film output box structure of the present invention; Figure 4 This is a schematic diagram of the partition plate structure of the present invention; Figure 5 This is a schematic diagram of the folded liquid storage basin structure of the present invention; Figure 6 This is a schematic diagram of the heating module structure of the present invention; Figure 7 This is the invention Figure 6 Enlarged diagram of point A in the middle.
[0017] In the diagram: 11. Plastic bottle crusher; 2. Crushing and immersion module; 21. Folding liquid storage basin; 211. Hard basin bottom; 212. Shrinkable basin waist; 213. Supporting metal wire; 22. Lifting plate; 23. Electric push rod; 24. Pressure-bearing base plate; 25. Guide column; 26. Heating module; 27. Temperature detection module; 31. Sheet output box; 32. Discharge conveyor belt; 33. Drive motor; 34. Divider plate; 35. Receiving conveyor belt; 36. Receiving flexible plate. Detailed Implementation
[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.
[0019] like Figures 1-7 As shown, a recycled polyester bottle flake production equipment includes: a plastic bottle crusher 11, which has a crushing chamber and a crushing immersion module 2 is provided at the bottom of the crushing chamber; The crushing and immersion module 2 includes a folded liquid storage basin 21, a heating module 26, a lifting control module, and a discharge module; The folded liquid storage basin 21 is located at the bottom of the grinding chamber. The interior of the folded liquid storage basin 21 is pre-filled with liquid. The heating module 26 is located inside the folded liquid storage basin 21 and is used to heat the liquid to 70°C to 80°C. The lifting control module is located at the bottom of the folding liquid storage basin 21 and is used to drive the folding liquid storage basin 21 to move up and down in the vertical direction. The discharge module includes a receiving conveyor belt 35 with several mesh holes. The receiving conveyor belt 35 is located at the bottom of the crushing chamber and above the folded liquid storage basin 21, and is used to carry the waste plastic bottles poured into the crushing chamber. The crushing and immersion module 2 is configured such that after the waste plastic bottle is poured into the crushing chamber and carried by the receiving conveyor belt 35, the lifting control module drives the folding liquid storage basin 21 to move upward, so that the hot liquid of 70°C to 80°C in the folding liquid storage basin 21 flows upward through the mesh of the receiving conveyor belt 35 and enters the crushing chamber to immerse the waste plastic bottle. After immersion for a preset time, the lifting control module drives the folding liquid storage basin 21 to move downwards to retract the hot liquid. At the same time, the plastic bottle crusher 11 crushes the softened waste plastic bottles, so that the waste plastic bottles are crushed into flakes in the softened state.
[0020] The discharge module also includes a sheet discharge box 31, which is fixed to the side wall of the plastic bottle crusher 11 and is Z-shaped. The discharge box 31 is equipped with a discharge conveyor belt 32 inside the sheet discharge box 31. The connecting end of the discharge conveyor belt 32 is connected to a drive motor 33 for driving the discharge conveyor belt 32 and the receiving conveyor belt 35.
[0021] The receiving conveyor belt 35 is located in the lower part of the Z-shape of the output box 31, and the output conveyor belt 32 is located in the upper part of the Z-shape of the output box 31. The receiving conveyor belt 35 and the output conveyor belt 32 are connected to each other, and the plastic sheets received on the receiving conveyor belt 35 are conveyed to the output conveyor belt 32.
[0022] A partition plate 34 is provided below the receiving conveyor belt 35. The partition plate 34 divides the crushing chamber of the plastic bottle crusher 11 into upper and lower parts. The folded liquid storage basin 21 is located below the partition plate 34. The folded liquid storage basin 21 is fixedly and sealed to the partition plate 34. The center of the partition plate 34 is hollowed out.
[0023] The outer wall of the receiving conveyor belt 35 is arrayed with receiving flexible plates 36, and the receiving flexible plates 36 are provided with mesh holes. The receiving flexible plates 36 are bracket-shaped and the bending direction is the same as the rotation direction of the receiving flexible plates 36, which are used to scrape plastic bottle shreds from the hot liquid.
[0024] The folding liquid storage basin 21 consists of three parts: a rigid basin bottom 211, a shrinkable basin waist 212, and supporting metal wires 213. The rigid basin bottom 211 is located at the bottom, the shrinkable basin waist 212 is fixed on the rigid basin bottom 211, and several supporting metal wires 213 are embedded in the wall panel of the shrinkable basin waist 212. The top of the shrinkable basin waist 212 is fixedly connected to the partition plate 34.
[0025] The heating module 26 is embedded in the inner bottom wall of the hard basin 211. The inner bottom wall of the hard basin 211 is also fixedly equipped with a temperature detection module 27, which is used to detect the temperature of the liquid in the folded liquid storage basin 21 in real time, so that the heating module 26 can adjust the temperature of the liquid in real time.
[0026] A lifting plate 22 is fixedly installed at the bottom of the hard basin 211. An electric push rod 23 is installed below the lifting plate 22. A pressure-bearing base plate 24 is installed below the electric push rod 23, and the pressure-bearing base plate 24 is fixedly connected to the support leg of the plastic bottle crusher 11.
[0027] The telescopic arm end of the electric push rod 23 is fixedly connected to the lifting plate 22, which is used to control the lifting and lowering of the lifting plate 22 and the opening and closing of the folding liquid storage basin 21. When the lifting plate 22 rises, it pushes the shrink basin waist 212 to retract into the hard basin bottom 211, so that the hot liquid can immerse the grinding chamber upward.
[0028] The upper wall of the pressure base plate 24 is also provided with guide columns 25. The guide columns 25 are distributed on both sides of the electric push rod 23. The guide columns 25 pass through the lifting plate 22 and are used for the lifting plate 22 to slide up and down along the guide columns 25.
[0029] The core technology lies in reducing the difficulty and energy consumption of pulverizing polyester bottle flakes through a process of "first softening with hot liquid, then pulverizing," utilizing hot liquid infiltration and temperature control technology. Its specific working principle is based on the coupling of thermodynamic heat transfer, fluid statics, and mechanical kinematics.
[0030] The overall structure of the equipment consists of a plastic bottle crusher 11 and its internal crushing and immersion module 2. The crushing and immersion module 2 includes a folding liquid storage basin 21, a heating module 26, a lifting control module, and a discharge module.
[0031] Initial state and hydrothermal preparation: Before the equipment is started, the folded liquid storage basin 21 is pre-filled with liquid (usually water or an additive solution). The heating module 26 is embedded in the inner bottom wall of the rigid basin bottom 211 of the folded liquid storage basin 21 and begins to heat the liquid. Simultaneously, the temperature detection module 27 monitors the liquid temperature in real time and feeds the signal back to the heating module 26, forming a closed-loop control to precisely maintain the liquid temperature between 70°C and 80°C. This temperature range corresponds to the glass transition temperature range of polyester PET material, at which point the polyester molecular chain segments begin to move, and the material transitions from a glassy state to a highly elastic state, with reduced rigidity but not melting. According to the first law of thermodynamics, the heat provided by the heating module 26... The relationship with the liquid temperature rise is as follows: ; in, For liquid mass, Specific heat capacity of the liquid The target temperature (e.g., 75℃). This is the initial room temperature.
[0032] Feeding and Loading: After the waste plastic bottles are poured into the crushing chamber, they fall directly onto the crushing blades inside. The receiving conveyor belt 35 is located at the bottom of the crushing chamber and above the folded liquid storage basin 21. Its surface is covered with several mesh holes, which allow liquid to pass through while intercepting solid plastic bottles. At this time, the folded liquid storage basin 21 is in a descending and contracted state, and its internal contracted basin waist 212 is compressed, so the hot liquid level is lower than that of the receiving conveyor belt 35.
[0033] Hydrothermal immersion softening process: The lifting control module is activated: the telescopic arm of the electric push rod 23 extends upward, pushing the lifting plate 22 to slide vertically upward along the guide column 25. Since the lifting plate 22 is fixedly connected to the bottom of the rigid basin bottom 211 of the folding liquid storage basin 21, and the top of the folding liquid storage basin 21 is fixedly and sealed to the partition plate 34, and the partition plate 34 has a hollow center, when the rigid basin bottom 211 rises, the shrink basin waist 212 is stretched and unfolded, while the supporting metal wire 213 provides radial support to prevent tipping.
[0034] As the folding storage basin 21 moves upward, the 70°C to 80°C hydrothermal liquid inside is forced to rise under the influence of gravity. The hydrothermal liquid first passes through the central cutout of the partition plate 34, then through the mesh of the receiving conveyor belt 35, and continues to immerse the waste plastic bottle. During the immersion process, forced convection heat transfer occurs between the hydrothermal liquid and the surface of the plastic bottle. According to Newton's law of cooling, the amount of heat absorbed by the plastic bottle per unit time... for: ; in, The convective heat transfer coefficient is... This represents the contact area between the plastic bottle and the hot liquid. As the temperature difference decreases, the heat absorption rate decreases. After immersion for a preset time (e.g., 30-60 seconds), the overall temperature of the plastic bottle approaches 70-80℃, the molecular chain mobility is significantly enhanced, and the material is fully softened. This stage avoids adhesion caused by heat melting, only reducing its elastic modulus.
[0035] Hydrothermal retreat and pulverization: After a preset immersion time, the lifting control module reverses its operation: the electric push rod 23 retracts, causing the lifting plate 22 and the rigid basin bottom 211 to move downwards. The shrinking basin waist 212 of the folding liquid storage basin 21 folds and retracts under the influence of gravity and structural elasticity, causing the hot liquid level to drop rapidly, retracting from the crushing chamber back into the folding liquid storage basin 21. The hot liquid flows back through the mesh of the receiving conveyor belt 35, while the softened waste plastic bottles, intercepted by the mesh, remain on the receiving conveyor belt 35.
[0036] As the liquid descends, the plastic bottle crusher 11 operates simultaneously, pulverizing the softened waste plastic bottles. Because the plastic bottles are in a highly elastic state, their toughness is significantly reduced, decreasing the shear force required for crushing and avoiding dust and burrs generated by brittle crushing. This results in regularly shaped, sheet-like recycled polyester bottle flakes. The crushing process follows the principles of fracture mechanics: the fracture toughness of softened materials decreases, and the critical fracture stress decreases, thus reducing crushing energy consumption.
[0037] Discharge process: After crushing, the discharge module begins operation. The drive motor 33 drives the discharge conveyor belt 32 and the receiving conveyor belt 35 to rotate synchronously. The receiving conveyor belt 35 laterally transports the crushed flake material to the docking point with the discharge conveyor belt 32. Because the discharge box 31 has a Z-shaped structure, the receiving conveyor belt 35 is located at the lower part of the Z, and the discharge conveyor belt 32 is located at the upper part of the Z, forming a vertical lifting path. The material is transferred to the discharge conveyor belt 32 and conveyed upwards to the outside of the equipment. During the conveying process, the receiving flexible plate 36 is bracket-shaped and has mesh openings, with the bending direction in the same direction as the rotation. When the receiving flexible plate 36 rotates with the receiving conveyor belt 35, its bending structure effectively scrapes away any sunken or adhered plastic flakes from the hot liquid and discharges excess liquid through the mesh, achieving initial solid-liquid separation.
[0038] Significantly reduced crushing energy consumption: By preheating waste plastic bottles to 70-80℃ (the glass transition temperature range), the plastic changes from a glassy state to a highly elastic state, reducing the material's strength and toughness. According to the principles of fracture mechanics, the required crushing shear force for softened plastic can be reduced by 30%-50%, thereby significantly reducing the motor power consumption of the plastic bottle crusher 11.
[0039] Improved flake quality and uniformity: Crushing in a softened state avoids brittle fracture, dust, burrs, and irregular fragments that are easily generated during room temperature crushing. The resulting recycled polyester flakes have more regular shapes and smoother edges, which is beneficial for subsequent washing, drying, and granulation processes, thereby increasing the added value of recycled materials.
[0040] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.
Claims
1. A recycled polyester bottle flake production equipment, characterized in that, include: A plastic bottle crusher (11) has a crushing chamber, and a crushing immersion module (2) is provided at the bottom of the crushing chamber. The crushing and immersion module (2) includes a folded liquid storage basin (21), a heating module (26), a lifting control module, and a discharge module; The folded liquid storage basin (21) is located at the bottom of the grinding chamber. The interior of the folded liquid storage basin (21) is pre-filled with liquid. The heating module (26) is located inside the folded liquid storage basin (21) and is used to heat the liquid to 70°C to 80°C. The lifting control module is located at the bottom of the folding liquid storage basin (21) and is used to drive the folding liquid storage basin (21) to move up and down in the vertical direction. The discharge module includes a receiving conveyor belt (35) with several mesh holes distributed on it. The receiving conveyor belt (35) is located at the bottom of the crushing chamber and above the folded liquid storage basin (21) for carrying the waste plastic bottles poured into the crushing chamber. The crushing and immersion module (2) is configured such that after the waste plastic bottle is poured into the crushing chamber and carried by the receiving conveyor belt (35), the lifting control module drives the folding liquid storage basin (21) to move upward, so that the hot liquid of 70°C to 80°C in the folding liquid storage basin (21) flows upward through the mesh of the receiving conveyor belt (35) and enters the crushing chamber to immerse the waste plastic bottle; After immersion for a preset time, the lifting control module drives the folding liquid storage basin (21) to move downwards to retract the hot liquid. At the same time, the plastic bottle crusher (11) crushes the softened waste plastic bottle, so that the waste plastic bottle is crushed into flakes in the softened state.
2. The recycled polyester bottle flake production equipment according to claim 1, characterized in that, The discharge module also includes a sheet discharge box (31), which is fixed to the side wall of the plastic bottle crusher (11) and is Z-shaped. The discharge box (31) is rotatably equipped with a discharge conveyor belt (32) inside the sheet discharge box (31). The connecting end of the discharge conveyor belt (32) is connected to a drive motor (33) for driving the discharge conveyor belt (32) and the receiving conveyor belt (35).
3. The recycled polyester bottle flake production equipment according to claim 2, characterized in that, The receiving conveyor belt (35) is located in the lower part of the Z-shape of the output box (31), and the output conveyor belt (32) is located in the upper part of the Z-shape of the output box (31). The receiving conveyor belt (35) and the output conveyor belt (32) are connected to each other, and the plastic sheets received on the receiving conveyor belt (35) are conveyed to the output conveyor belt (32).
4. The recycled polyester bottle flake production equipment according to claim 3, characterized in that, A partition plate (34) is provided below the receiving conveyor belt (35). The partition plate (34) divides the crushing chamber of the plastic bottle crusher (11) into upper and lower parts. The folded liquid storage basin (21) is located below the partition plate (34). The folded liquid storage basin (21) is fixedly and sealed to the partition plate (34). The center of the partition plate (34) is hollowed out.
5. The recycled polyester bottle flake production equipment according to claim 5, characterized in that, The outer wall of the receiving conveyor belt (35) is arrayed with receiving soft plates (36), and the receiving soft plates (36) are provided with mesh holes. The receiving soft plates (36) are bracket-shaped and the bending direction is the same as the rotation direction of the receiving soft plates (36), which are used to scrape plastic bottle shreds from the hot liquid.
6. The recycled polyester bottle flake production equipment according to claim 5, characterized in that, The folding liquid storage basin (21) consists of three parts: a hard basin bottom (211), a shrink basin waist (212), and supporting metal wires (213). The hard basin bottom (211) is located at the bottom, and the shrink basin waist (212) is fixed on the hard basin bottom (211). Several supporting metal wires (213) are embedded in the wall panel of the shrink basin waist (212), and the top of the shrink basin waist (212) is fixedly connected to the partition plate (34).
7. The recycled polyester bottle flake production equipment according to claim 6, characterized in that, The heating module (26) is embedded in the inner bottom wall of the hard basin bottom (211). The inner bottom wall of the hard basin bottom (211) is also fixedly provided with a temperature detection module (27) for real-time detection of the temperature of the liquid in the folded liquid storage basin (21) so that the heating module (26) can adjust the temperature of the liquid in real time.
8. The recycled polyester bottle flake production equipment according to claim 7, characterized in that, A lifting plate (22) is fixedly installed at the bottom of the hard basin bottom (211). An electric push rod (23) is installed below the lifting plate (22). A pressure-bearing base plate (24) is installed below the electric push rod (23). The pressure-bearing base plate (24) is fixedly connected to the support leg of the plastic bottle crusher (11).
9. The recycled polyester bottle flake production equipment according to claim 8, characterized in that, The telescopic arm end of the electric push rod (23) is fixedly connected to the lifting plate (22) to control the lifting plate (22) to rise and fall, and to control the opening and closing of the folded liquid storage basin (21). When the lifting plate (22) rises, it pushes the shrink basin waist (212) to shrink into the hard basin bottom (211), so that the hot liquid is immersed in the crushing chamber.
10. The recycled polyester bottle flake production equipment according to claim 9, characterized in that, The upper wall of the pressure-bearing base plate (24) is also provided with guide columns (25). The guide columns (25) are distributed on both sides of the electric push rod (23). The guide columns (25) pass through the lifting plate (22) and are used for the lifting plate (22) to slide up and down along the guide columns (25).