Waste plastic color sorting device

Abstract

The utility model discloses a waste plastic color sorting device, and relates to the field of plastic particle screening equipment. The device comprises a vibration conveyor, the bottom of the vibration conveyor is communicated with an obliquely downward conveying pipe, the conveying pipe is communicated with an obliquely arranged blanking pipe, and the bottom of the blanking pipe is inserted into a color selection area. An electrostatic adsorption mechanism is installed at the top of the discharging pipe, a detection area is arranged at the communication position of the electrostatic adsorption mechanism and the discharging pipe, and a photoelectric detection module is arranged above. The color sorting device is further provided with an air flow pump, the air outlet end of the air flow pump communicates with the discharging pipe through an air supply pipe, and the air flow injection direction of the air supply pipe inclines upwards. Inclined upward airflow with buoyancy smaller than the gravity of plastic particles is injected through an airflow pump, the particles move downwards to a color selection area, light scraps are brought to a detection area by the airflow, and a photoelectric detection module monitors signals and triggers an electrostatic adsorption mechanism to adsorb the scraps. The waste plastic color sorting device can reduce chipping interference, improves color sorting precision and is suitable for recycling and classifying waste plastic.

Description

Technical Field

[0001] This utility model relates to the field of plastic particle screening equipment, and in particular to a waste plastic color sorting device. Background Technology

[0002] In the field of waste plastic recycling, plastic particles need to be sorted and recycled according to their properties (such as color and transparency) to improve the quality and utilization value of recycled plastics. While traditional color sorters can achieve basic color sorting, they have significant shortcomings when processing waste plastics:

[0003] During transportation and storage, waste plastic granules are prone to shedding small amounts of debris due to friction and other reasons. The color and reflective properties of these debris may be similar to or different from the target plastic granules, causing the photoelectric detection system of the color sorter to misjudge, misidentify normal granules as impurities and reject them, or allow impurities to mix into qualified granules, reducing the classification accuracy.

[0004] In summary, how to avoid or reduce the interference of debris and foreign matter during the color sorting process of plastic particles has become a technical problem that needs to be solved. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model provides a waste plastic color sorting device, including a vibrating conveyor, with an inclined downward conveying pipe connected to the bottom of the vibrating conveyor, and a discharge pipe connected to the conveying pipe. The discharge pipe is inclined and its bottom is inserted into the color sorting area of ​​the color sorting device.

[0007] An electrostatic adsorption mechanism is installed at the top of the feeding pipe. A detection area is located at the connection point between the electrostatic adsorption mechanism and the top of the feeding pipe, and a photoelectric detection module is installed above the detection area. The color sorting device is also equipped with an air pump. An air supply pipe connected to the feeding pipe is located at the outlet of the air pump. The air supply pipe is inclined upwards to inject air into the feeding pipe.

[0008] As a preferred technical solution of the present invention, the electrostatic adsorption mechanism includes an inlet located above the detection area, a connection between the conveying pipe and the discharge pipe located below the detection area, and a connection between the air supply pipe and the discharge pipe located below the connection between the conveying pipe and the discharge pipe.

[0009] As a preferred technical solution of the present invention: the inner wall surface of the feeding pipe is smooth, and a grid plate with a pore size smaller than that of the plastic particles is installed at the position where the air supply pipe connects to the feeding pipe.

[0010] As a preferred technical solution of the present invention, the buoyancy of the airflow supplied by the air pump to the downward feed pipe is less than the weight of the plastic particles.

[0011] As a preferred technical solution of the present invention, the photoelectric detection module is equipped with multiple continuously distributed photoelectric probes, and the multiple photoelectric probes are facing the detection area.

[0012] As a preferred technical solution of the present invention: the electrostatic adsorption mechanism is provided with an airflow channel, an electrostatic adsorption area is connected to the side of the airflow channel, and an external exhaust mesh cover is provided at the top of the airflow channel.

[0013] Compared with existing technologies, the beneficial effects of this utility model are:

[0014] This invention injects an upward-sloping airflow (with buoyancy less than the weight of the particles) through an air supply pipe. Utilizing the difference between gravity and airflow resistance, heavier plastic particles descend along the feed pipe to the color sorting area, while lighter debris and foreign objects are carried by the airflow to the detection area. The rising debris and foreign objects are monitored by a photoelectric detection module, triggering the activation of an electrostatic adsorption mechanism to effectively adsorb and clean them, preventing debris and particles from mixing and entering the detection process, thus reducing the source of false judgments from a physical perspective. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the color sorting device of this utility model.

[0016] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0017] Figure 3 for Figure 1 A magnified structural diagram of section B in the middle.

[0018] Wherein: 1-Vibrating conveyor; 2-Conveying pipe; 3-Discharging pipe; 4-Plastic granules; 5-Debris and foreign matter; 6-Air pump frame; 7-Air pump; 8-Air supply pipe; 9-Grid plate; 10-Electrostatic adsorption mechanism; 1001-Electrostatic adsorption area; 1002-Airflow channel; 1003-External exhaust mesh cover; 11-Inlet; 12-Detection area; 13-Photoelectric detection module. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] Example 1, please refer to Figure 1 , Figure 2 , Figure 3This utility model designs a waste plastic color sorting device, which mainly consists of a vibrating conveyor 1, a conveying pipe 2, a discharge pipe 3, an electrostatic adsorption mechanism 10, a photoelectric detection module 13, an air pump 7, and an air supply pipe 8. The specific structure and connection relationship of each component are as follows:

[0021] Vibrating feeder 1 is the feed end of the device, used to transport the plastic granules 4 to be color sorted. The bottom of vibrating feeder 1 is connected to the feed pipe 2, and the plastic granules 4 move downward at an incline along the feed pipe 2 through vibration.

[0022] The conveying pipe 2 is set at an angle downwards. The upper end of the conveying pipe 2 is connected to the vibrating conveyor 1, and the lower end of the conveying pipe 2 is connected to the feeding pipe 3.

[0023] The feeding pipe 3 is inclined and its bottom is inserted into the color sorting area of ​​the color sorting device to transport plastic particles 4 to the color sorting area for sorting. The top of the feeding pipe 3 is connected to the electrostatic adsorption mechanism 10, and its inner wall surface is smooth (to reduce friction and retention of plastic particles 4 with the pipe wall). The connection point between the feeding pipe 3 and the conveying pipe 2 is located below the detection area 12. The connection point between the air supply pipe 8 and the feeding pipe 3 is located below the connection point between the conveying pipe 2 and the feeding pipe 3, ensuring that the airflow flows upward from the bottom of the feeding pipe 3.

[0024] A grid plate 9 is installed at the connection between the air supply pipe 8 and the discharge pipe 3. The size of the grid plate is smaller than that of the plastic particles 4 to prevent the plastic particles 4 from entering the air supply pipe 8, while allowing airflow to pass through.

[0025] Electrostatic adsorption mechanism 10: installed on the top of the feed pipe 3, forming a detection area 12 at the position where it connects with the top of the feed pipe 3.

[0026] The inlet 11 of the electrostatic adsorption mechanism 10 is located above the detection area 12 and serves as the entry point for debris and foreign objects 5 to enter the electrostatic adsorption mechanism 10. The airflow channel 1002 guides excess airflow through, and an external exhaust mesh 1003 is installed at the top to discharge the airflow outside the device. The electrostatic adsorption area 1001 is located beside the airflow channel 1002 and generates static electricity through energization to adsorb debris and foreign objects 5 that enter the electrostatic adsorption mechanism 10.

[0027] When the photoelectric detection module 13 detects debris 5, the control system activates the electrostatic adsorption zone 1001 (e.g., for 5 seconds) to adsorb the debris, and the airflow is discharged through the airflow channel 1002 and the external exhaust screen 1003.

[0028] The photoelectric detection module 13 is equipped with multiple continuously distributed photoelectric probes, facing the detection area 12. The photoelectric detection module 13 detects debris and foreign objects 5 passing through the detection area 12 in real time, transmits the signal to the control system, and triggers the electrostatic adsorption mechanism 10 to operate.

[0029] The air pump 7 is fixedly installed via the air pump bracket 6, and the air outlet of the air pump 7 is connected to the air supply pipe 8.

[0030] The air supply pipe 8 is connected to the feed pipe 3, and the air flow direction injected into the feed pipe 3 is inclined upward (that is, the air flow direction is opposite to the downward direction of the plastic particles 4).

[0031] The airflow generated by the air pump 7 has a buoyancy force that is less than the weight of the plastic particles 4, ensuring that the plastic particles 4 can overcome the airflow resistance and continue to descend, while the lighter debris 5 is carried by the airflow to the detection area 12 above.

[0032] Example 2: The specific working principle of this utility model device is as follows:

[0033] Feeding stage: Vibrating conveyor 1 vibrates, discharging plastic granules 4 downwards, which then enter the discharge pipe 3 through the conveying pipe 2 and move downwards at an angle along the discharge pipe 3.

[0034] Airflow sorting stage: Airflow pump 7 injects upward-sloping airflow into the feed pipe 3 through air supply pipe 8. Due to its greater gravity, the plastic granules 4 overcome airflow resistance and continue to descend, eventually entering the color sorting area for color sorting. The lighter debris 5 that falls off during the descent of the plastic granules 4 is carried upward by the airflow and enters the detection area 12.

[0035] Foreign object detection and adsorption stage: The photoelectric probe of the photoelectric detection module 13 detects the debris 5 in the detection area 12 and sends a signal to the control system. The control system activates the electrostatic adsorption mechanism 10, and the electrostatic adsorption zone 1001 is energized to generate static electricity, adsorbing the debris 5 that enters the mechanism through the inlet 11.

[0036] Excess airflow is discharged through airflow channel 1002 and external exhaust screen 1003 to avoid affecting the airflow balance inside the device.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste plastic color sorting device, comprising a vibrating conveyor (1), wherein the bottom of the vibrating conveyor (1) is connected to an inclined downward conveying pipe (2), characterized in that: The color sorting device is equipped with a feeding pipe (3) that is connected to the feeding pipe (2). The feeding pipe (3) is inclined and its bottom is inserted into the color sorting area of ​​the color sorting device. An electrostatic adsorption mechanism (10) is installed on the top of the feeding pipe (3). A detection area (12) is arranged at the position where the electrostatic adsorption mechanism (10) communicates with the top of the feeding pipe (3). A photoelectric detection module (13) is arranged above the detection area (12). The color sorting device is also equipped with an air pump (7), and the air outlet of the air pump (7) is equipped with an air supply pipe (8) connected to the feed pipe (3). The air supply pipe (8) is inclined upward in the direction of the air flow injected into the feed pipe (3).

2. The waste plastic color sorting device according to claim 1, characterized in that: The electrostatic adsorption mechanism (10) includes an inlet (11) located above the detection area (12), the connection position of the conveying pipe (2) and the discharge pipe (3) is located below the detection area (12), and the connection position of the air supply pipe (8) and the discharge pipe (3) is located below the connection position of the conveying pipe (2) and the discharge pipe (3).

3. A waste plastic color sorting device according to claim 1 or 2, characterized in that: The inner wall of the feeding pipe (3) is smooth, and a grid plate (9) with a pore size smaller than that of the plastic particles (4) is installed at the position where the air supply pipe (8) connects with the feeding pipe (3).

4. The waste plastic color sorting device according to claim 1, characterized in that: The buoyancy of the airflow supplied by the air pump (7) to the downward feed pipe (3) is less than the weight of the plastic particles (4).

5. The waste plastic color sorting device according to claim 1, characterized in that: The photoelectric detection module (13) is equipped with multiple photoelectric probes that are continuously distributed, and the multiple photoelectric probes are facing the detection area (12).

6. The waste plastic color sorting device according to claim 1, characterized in that: The electrostatic adsorption mechanism (10) is provided with an airflow channel (1002), and an electrostatic adsorption area (1001) is connected to the side of the airflow channel (1002). An external exhaust mesh cover (1003) is provided on the top of the airflow channel (1002).

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