Preheating and mixing device for plastic recycling and processing
By using a preheating mixing device in plastic recycling processing, the problem of uniform mixing of plastic granules and plasticizers was solved, achieving efficient mixing and preheating and improving the quality of plastic recycling processing.
Patent Information
- Application Number
- CN202511119386.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-11
- Publication Date
- 2025-11-18
AI Technical Summary
Existing mixing equipment cannot effectively solve the problem of uniform mixing of plastic granules to be recycled and plasticizers, resulting in separation during the transfer process and affecting the quality of plastic recycling processing.
Design a preheating mixing device that uses a conical stirring drum and stirring head, and is equipped with a heating device and sensors to achieve uniform mixing and preheating of plastic granules and plasticizers, which are then directly fed into a twin-screw extruder for melt processing.
It improves the quality of plastic recycling and processing. By uniformly mixing and preheating, it ensures that the materials maintain an efficient mixing state during the transfer process, thereby enhancing the melting effect.
Smart Images
Figure CN120962986A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of plastic recycling and processing equipment, and more particularly to a preheating and mixing device for plastic recycling and processing. Background Technology
[0002] In plastic recycling, the plastic to be recycled needs to be washed, crushed, and dried. Afterward, it is mixed evenly with various plasticizers and then fed into a twin-screw extruder for melting and extrusion. The uniformity of the mixing and the degree of melting between the plastic and plasticizers determine the quality of the recycled plastic. Currently, conventional mixing equipment used for mixing plastic granules and plasticizers is separate from the twin-screw extruder. This means the plastic granules and plasticizers are first mixed in a drum mixer or conical agitator. This causes separation between the plastic granules and plasticizers during the transfer from the mixing equipment to the twin-screw extruder due to density or particle size differences, affecting the uniformity of the mixing. Summary of the Invention
[0003] The purpose of this invention is to provide a preheating mixing device for plastic recycling processing. Specifically, it provides a preheating mixing device that can effectively and uniformly mix and preheat plastic granules to be recycled with various plasticizers before directly feeding them into a twin-screw extruder, thereby effectively improving the quality of plastic recycling processing.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: a preheating mixing device for plastic recycling processing, comprising a fixed support, a conical stirring cylinder and a stirring head, wherein a first heating device is provided on the inner side wall of the conical stirring cylinder, and the stirring head includes a stirring shaft and a heating stirring rod disposed on the stirring shaft, wherein a second heating device is disposed inside the heating stirring rod; a drive motor is disposed on the fixed support and drivenly connected to the stirring head, and a controller is also disposed on the fixed support and controlledly connected to the drive motor, the first heating device and the second heating device.
[0005] Specifically, the first heating device on the inner wall of the conical stirring drum and the heating stirring rod on the stirring head are distributed in multiple layers, and the first heating device and the heating stirring rod correspond one-to-one.
[0006] Specifically, multiple material detection sensors are installed on the inner wall of the conical stirring drum, and each of the multiple material detection sensors corresponds to a multi-layer first heating device; the material detection sensors are electrically connected to the controller.
[0007] Specifically, the lower end of the conical mixing drum is provided with a discharge port that connects to the feed port of the twin-screw extruder, and a rotating opening and closing baffle is provided at the connection between the upper end of the discharge port and the lower end of the conical mixing drum.
[0008] Specifically, temperature detection probes are installed next to multiple material detection sensors; the temperature detection probes are electrically connected to the controller.
[0009] Specifically, the heating stirring rod is flat and inclined on the stirring shaft, with the heating stirring rod tilted downwards in the direction of rotation of the stirring shaft.
[0010] Specifically, an annular electrode is provided on the stirring shaft, and a wireless control module is provided inside the stirring shaft and is connected to a second heating device provided inside the heating stirring rod. A controller on the fixed bracket is connected to the wireless control module for control and communication. A conductive brush is provided on the fixed bracket and is connected to the annular electrode. An external power supply provides power to the wireless control module and the second heating device through the conductive brush on the fixed bracket and the annular electrode on the stirring shaft.
[0011] The beneficial effects of this invention are as follows: by using a stirring head equipped with a heated stirring rod in conjunction with a conical stirring cylinder whose inner wall can be heated, and connecting the discharge port of the conical stirring cylinder to the feed port of a screw extruder, uniform stirring and preheating of the plastic to be recycled and various additives can be achieved, and the plastic can be directly fed into the screw extruder for melting after preheating and stirring, which effectively improves the quality of recycled plastic processing. Attached Figure Description
[0012] Appendix Fig. 1 This is a schematic diagram of the overall structure of the preheating mixing device in the embodiment; Appendix Fig. 2 This is a three-dimensional structural diagram of the stirring head in the embodiment; Appendix Fig. 3 This is a schematic diagram of the electrical connection of the preheating mixing device in the embodiment. Detailed Implementation
[0013] Example 1, referring to Figs. 1-3 A preheating mixing device for plastic recycling processing includes a fixed support 1, a conical stirring drum 2, and a stirring head 3. The inner wall of the conical stirring drum 2 is provided with a first heating device 41. The stirring head 3 includes a stirring shaft 31 and a heating stirring rod 32 disposed on the stirring shaft 31. A second heating device 42 is disposed inside the heating stirring rod 32. A drive motor 11 (not shown in the figure) is disposed on the fixed support 1 and is driven and connected to the stirring head 3. A controller 12 is also disposed on the fixed support 1 and is controlled and connected to the drive motor, the first heating device 41, and the second heating device 42.
[0014] In this embodiment, the first heating device 41 on the inner wall of the conical mixing drum 2 and the heating stirring rod 32 on the stirring head 3 can heat the material during the stirring process to achieve the effect of preheating and stirring. The preheated and stirred material can fall directly from the conical mixing drum 2 into the screw extruder for melting and processing, thereby improving the quality of plastic recycling processing. The drive motor 11 can drive the stirring shaft 31 of the stirring head 3 through a gear transmission structure. The power supply line of the second heating device 42 on the stirring head 3 adopts the following structure: an annular electrode 33 is provided on the stirring shaft 31, a wireless control module 34 is provided inside the stirring shaft 31 and is connected to the second heating device 42 inside the heating stirring rod 32, a controller 12 on the fixed bracket 1 is connected to the wireless control module 34, a conductive brush 13 is provided on the fixed bracket 1 and is correspondingly connected to the annular electrode 33, and an external power supply provides power to the wireless control module 34 and the second heating device 42 through the conductive brush 13 on the fixed bracket 1 and the annular electrode 33 of the stirring shaft 31. In addition, the lower end of the conical mixing drum 2 is provided with a discharge port 21 that is connected to the feed port of the twin-screw extruder. The upper end of the discharge port 21 is provided with a rotating opening and closing baffle 22 at the connection between the upper end of the discharge port 21 and the lower end of the conical mixing drum 2. Using the rotating opening and closing baffle 22, the material can be leaked into the screw extruder by controlling the rotating opening and closing baffle 22 to open after the material is evenly mixed.
[0015] Specifically, the heating stirring rod 32 is flat and inclined on the stirring shaft 31, tilting downwards in the direction of rotation of the stirring shaft 31. The flat and inclined arrangement of the heating stirring rod 32 allows it to stir the material upwards when the stirring head 3 rotates, and combined with the effect of gravity on the material, this improves the uniformity of the stirring and enhances the quality of plastic recycling processing.
[0016] Since the screw extruder requires a certain amount of time to consume the material, in order to ensure the temperature and uniformity of the material throughout the process, it is necessary to keep the material heated and stirred while it is being fed into the screw extruder. As the material flows down, the material height inside the conical mixing drum 2 also decreases. To prevent the first heating device 41 and the second heating device 42 from burning out, the first heating device 41 on the inner wall of the conical mixing drum 2 and the heating stirring rod 32 on the stirring head 3 are distributed in multiple layers, with each first heating device 41 corresponding to a heating stirring rod 32. The multiple layers of first heating devices 41 and second heating devices 42 can shut off the corresponding heating devices as the material decreases, thus avoiding the problem of burning out. In addition, multiple material detection sensors 23 are installed on the inner wall of the conical mixing drum 2, and each material detection sensor 23 corresponds to one of the multiple layers of first heating devices 41; the material detection sensors 23 are electrically connected to the controller 12. The material detection sensor 23 can be used to detect the amount of material remaining in real time, thereby controlling the corresponding electric heating device to turn on or off. The material detection sensor 23 can be a photoelectric sensor. When there is material blocking the light, the receiver can receive the light signal reflected back after the transmitter is emitted, thereby detecting whether there is material.
[0017] In addition, a temperature detection probe 24 is also provided next to the multiple material detection sensors 23; the temperature detection probe 24 is electrically connected to the controller 12. The temperature detection probe 24 can be used to detect the temperature of the material, thereby controlling the heating power of the first heating device 41 and the second heating device 42 to automatically control the material temperature.
[0018] Of course, the above are only preferred embodiments of the present invention and are not intended to limit the scope of application of the present invention. Therefore, any equivalent changes made to the principle of the present invention should be included within the protection scope of the present invention.
Claims
1. A preheating and mixing device for plastic recycling processing, characterized in that: The device includes a fixed support, a conical stirring drum, and a stirring head. The inner wall of the conical stirring drum is provided with a first heating device. The stirring head includes a stirring shaft and a heating stirring rod disposed on the stirring shaft. A second heating device is disposed inside the heating stirring rod. A drive motor is disposed on the fixed support and is connected to the stirring head for driving. A controller is also disposed on the fixed support and is connected to the drive motor, the first heating device, and the second heating device for control.
2. The preheating and mixing device for plastic recycling processing according to claim 1, characterized in that: The first heating device on the inner wall of the conical stirring cylinder and the heating stirring rod on the stirring head are distributed in multiple layers, and the first heating device and the heating stirring rod correspond one-to-one.
3. A preheating mixing device for plastic recycling processing according to claim 2, characterized in that: Multiple material detection sensors are installed on the inner wall of the conical stirring drum, and each of the multiple material detection sensors corresponds to a multi-layer first heating device; the material detection sensors are electrically connected to the controller.
4. A preheating mixing device for plastic recycling processing according to claim 1, characterized in that: The lower end of the conical mixing drum is provided with a discharge port that is connected to the feed port of the twin-screw extruder, and a rotating opening and closing baffle is provided at the connection between the upper end of the discharge port and the lower end of the conical mixing drum.
5. A preheating mixing device for plastic recycling processing according to claim 3, characterized in that: Temperature detection probes are installed next to each of the multiple material detection sensors; the temperature detection probes are electrically connected to the controller.
6. A preheating mixing device for plastic recycling processing according to claim 1, characterized in that: The heating stirring rod is flat and inclined on the stirring shaft, with the heating stirring rod tilted downwards in the direction of rotation of the stirring shaft.
7. A preheating mixing device for plastic recycling processing according to claim 1, characterized in that: The stirring shaft is equipped with an annular electrode. A wireless control module is installed inside the stirring shaft and is connected to a second heating device installed inside the heating stirring rod. A controller on the fixed bracket is connected to the wireless control module for control and communication. A conductive brush is installed on the fixed bracket and is connected to the annular electrode. An external power source supplies power to the wireless control module and the second heating device through the conductive brush on the fixed bracket and the annular electrode of the stirring shaft.