Plastic particle feeding system

Abstract

The utility model discloses a plastic particle feeding system which comprises an air blower, a conveying pipeline and a material collecting barrel, annular flanges spaced by a certain distance are machined on the periphery of the conveying pipeline towards the interior of the conveying pipeline in a stamping or rolling mode, the cross section of each annular flange is provided with an arc, and the two ends of each arc are smoothly connected with the inner wall of the conveying pipeline in the tangential direction. The cross section of the annular flange can be arranged in a streamline mode. When the plastic particles rapidly move in the conveying pipeline by means of wind power, the plastic particles can jump by a certain amount due to the existence of the annular flanges, so that continuous friction between the plastic particles and the inner wall of the conveying pipeline is reduced, and the phenomenon of wire drawing caused by accumulation of a large amount of dust and heat generated by friction of the plastic particles is reduced.

Description

Technical Field

[0001] This utility model relates to the field of plastic granule production and processing, and in particular to a plastic granule feeding system. Background Technology

[0002] Plastic granules are raw materials used for storing, transporting, and processing plastics in a semi-finished state. During production, various raw materials are mixed evenly in a specific ratio using a mixer, then extruded into strips or filaments using an extruder. These strips are then granulated using a pelletizing machine, and finally conveyed to the next processing step via a feeding mechanism.

[0003] Because plastic granules are small and lightweight, they are typically transported pneumatically through pipelines. Specifically, a wind turbine or negative pressure device is connected to one end of the pipeline, and the plastic granules are then fed into the pipeline. The granules are propelled by the wind or drawn in by the negative pressure, moving along the pipeline to complete the transport. However, during operation, the high-speed movement of the plastic granules causes rapid friction against the pipe walls, leading to granule breakage, dust generation, and the high temperatures from friction melting a small amount of plastic, resulting in plastic stringing within the pipeline. Utility Model Content

[0004] The purpose of this invention is to improve the existing plastic pellet feeding system by reducing the friction between the plastic and the inner wall of the pipe during the pneumatic conveying of plastic pellets, thereby reducing the dust and heat generated by friction, preventing plastic from stringing, and improving the yield.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plastic granule feeding system, comprising a blower, a conveying pipe connected to the blower's outlet, a feed hopper interface radially connected to the conveying pipe, and a collection bucket connected to the end of the conveying pipe, characterized in that annular flanges are provided inside the conveying pipe at intervals of 20-50cm. The thickness of the annular flanges is preferably 3-5mm.

[0006] Furthermore, the pipe wall of the conveying pipe is recessed radially inward, forming the annular flange on the inner wall of the pipe.

[0007] Furthermore, the cross-section of the annular flange has an arc, and the two ends of the arc are tangentially aligned to ensure a smooth connection between the two sides of the annular flange and the inner wall of the conveying pipe. The angle corresponding to the arc is preferably 60~120°.

[0008] Furthermore, the cross-section of the annular flange is streamlined.

[0009] Furthermore, the conveying pipeline is provided with a pipeline connector. The pipeline connector has grooves on both sides that are connected to the conveying pipeline, which are adapted to the wall thickness of the conveying pipeline. The pipeline connector also has a threaded hole along its radial direction. The threaded hole communicates with the inside of the groove. The conveying pipeline and the pipeline connector are fastened by self-locking bolts.

[0010] Furthermore, the groove is tapered, and a rubber sealing layer is provided inside the groove.

[0011] Furthermore, an electrostatic dust collector is installed on one side of the collection hopper, and a screen is installed between the electrostatic dust collector and the collection hopper. The size of the screen mesh is smaller than that of the plastic.

[0012] Furthermore, the feed hopper interface is located near the blower in the conveying pipe with a recessed section.

[0013] The advantages and beneficial effects of this utility model are as follows:

[0014] 1. The inner concave part of the conveying pipe forms an annular flange, which causes the plastic particles to bounce when they come into contact with the annular flange while moving quickly inside the pipe. This avoids excessive friction between the plastic particles and the inner wall of the conveying pipe, which would otherwise generate a lot of dust and melt to form filamentous material.

[0015] 2. The pipe connector with bidirectional grooves combines the rigid structural components with the flexible rubber sealing layer through the tapered shape, and is then fastened to the pipe with self-locking bolts. This improves the sealing performance of the conveying pipe, reduces the risk of loosening at the pipe connection due to pressure and vibration, and also improves the air delivery efficiency of the blower.

[0016] 3. An electrostatic dust collector is also installed between the collection bin and the conveying pipe to remove dust generated by the friction between the plastic pipe and the conveying pipe, so that dust will not enter the collection bin and affect subsequent production processes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure at point A of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure at point B of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the material collection bucket of this utility model;

[0021] In the picture:

[0022] 1-Blower, 2-Conveying pipe, 3-Feed hopper interface, 4-Electrostatic dust collector, 5-Screen, 6-Collection bucket, 7-Annular flange, 8-Recess, 9-Circular arc, 10-Pipe connector, 11-Groove, 12-Threaded hole, 13-Taper, 14-Rubber sealing layer, 15-Recess. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0024] Example

[0025] A plastic pellet feeding system includes a blower 1, with a conveying pipe 2 connected to the blower 1's outlet. The conveying pipe 2 has a radially connected feed hopper interface 3, and a collection bin 6 is connected to its end. An electrostatic dust collector 4 is installed on one side of the collection bin 6, and a screen 5 is installed between the electrostatic dust collector 4 and the collection bin 6. Annular flanges 7 are provided inside the conveying pipe 2 at intervals of 20-50 cm. The thickness of the annular flanges 7 is preferably 3-5 mm.

[0026] The annular flange 7 inside the conveying pipe 2 allows plastic particles to collide and bounce when blown by the blower inside the pipe, reducing friction between the plastic and the pipe wall. This reduces dust generated by friction and the heat generated by rapid friction, which can cause the plastic to melt and form filaments. By installing a screen 5, filamentous plastic particles are screened and removed before the material enters the collection bin 6. The filamentous plastic particles before the screen are periodically removed by manual cleaning from the electrostatic dust collector 4. The pipe wall of the conveying pipe 2 is concave radially inward, forming the annular flange 7 on the inner wall. The inward concavity 8 can be achieved by processing the annular flange 7 structure on the inner side of the pipe from the outside using methods such as stamping and rolling, thus reducing the complexity of the pipe manufacturing process.

[0027] The cross-section of the annular flange 7 has an arc 9, with both ends of the arc 9 tangentially connecting the two sides of the annular flange to the inner wall of the conveying pipe smoothly. The angle corresponding to the arc is preferably 60~120°. The arc 9 makes the annular flange transition smoothly, thereby avoiding the flange from hindering the movement of plastic particles under wind power and causing blockage of the accumulation box. The cross-section of the annular flange 7 is also streamlined, making the pneumatic conveying smoother.

[0028] The conveying pipe 2 is provided with a pipe connector 10. The pipe connector 10 is provided with grooves 11 on both sides that are connected to the conveying pipe 2, which are adapted to the wall thickness of the conveying pipe 2. The pipe connector 10 is also provided with a threaded hole 12 along its radial direction. The threaded hole 12 communicates with the inside of the groove 11. The conveying pipe 2 and the pipe connector 10 are fastened by self-locking bolts. The groove 11 is provided with a taper 13, and a rubber sealing layer 14 is bonded inside the groove.

[0029] The pipe connector 10 connects to the conveying pipe 2 via a groove 11 that adapts to the wall thickness of the conveying pipe 2, which can better fit pipes of different specifications. The flexible rubber sealing layer 14 combined with the rigid groove 11 with a tapered 13 improves the reliability and sealing of the connection, reduces the risk of loosening of the conveying pipe 2 due to vibration or pressure changes, and reduces air leakage at the connection of the conveying pipe. In addition, an annular flange 7 can also be provided in the pipe connector.

[0030] A recessed portion 15 is provided on the conveying pipe 2 near the blower 1 at the feed hopper interface 3. The cross-sectional area of ​​the conveying pipe 2 is reduced by the recessed portion 15, and the air velocity is increased, which creates a negative pressure at the connection between the feed hopper and the conveying pipe 2, accelerating the flow of plastic particles from the feed hopper into the conveying pipe and preventing the plastic particles from accumulating in the conveying pipe 2 at the feed hopper.

[0031] Working principle:

[0032] The blower is started, and plastic granules enter the conveying pipe from the feed hopper. Due to the presence of the recessed section, according to Bernoulli's principle, the air velocity at the interface increases and the air pressure decreases. This negative pressure further draws the plastic granules from the feed hopper into the conveying pipe. The plastic granules in the conveying pipe move with the blower's airflow. During this movement within the pipe, the plastic granules collide with the annular flange inside the pipe, resulting in radial movement and reducing continuous friction between the plastic granules and the pipe wall, thus minimizing dust and stringing. The pipe connector uses a rigid, tapered groove combined with a flexible rubber sealing gasket. When the conveying pipe is inserted into the groove, the initial contact with the rubber sealing gasket is minimal. Then, the rigid tapered structure abuts against the gasket, and after being tightened with self-locking bolts, a seal is achieved at the pipe connection, reducing air leakage and improving the efficiency of the pneumatic conveying. When the plastic granules reach the electrostatic dust collector, the dust is attracted by electrostatic force, passing through the screen and entering the collector, further improving dust removal efficiency. Finally, the material enters the collection bin to await further processing in the next stage.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A plastic pellet feeding system, comprising a blower, a conveying pipe connected to the blower's outlet, a feed hopper interface radially connected to the conveying pipe, and a collection bucket connected to the end of the conveying pipe, characterized in that, The inside of the conveying pipeline is equipped with annular flanges at certain intervals.

2. The plastic pellet feeding system according to claim 1, characterized in that: The pipe wall of the conveying pipe is concave radially inward, forming the annular flange on the inner wall of the conveying pipe.

3. The plastic pellet feeding system according to claim 1, characterized in that: The cross-section of the annular flange has an arc, and the two ends of the arc are tangential, so that the two sides of the annular flange are smoothly connected to the inner wall of the conveying pipe.

4. The plastic pellet feeding system according to claim 1, characterized in that: The cross-section of the annular flange is streamlined.

5. The plastic pellet feeding system according to claim 1, characterized in that: The conveying pipeline is equipped with a pipe connector. The pipe connector has grooves on both sides that are connected to the conveying pipeline, which are adapted to the wall thickness of the conveying pipeline. The pipe connector also has a threaded hole along its radial direction. The threaded hole connects to the inside of the groove. The conveying pipeline and the pipe connector are fixed by self-locking bolts.

6. The plastic pellet feeding system according to claim 5, characterized in that: The groove is tapered, and a rubber sealing layer is provided inside the groove.

7. The plastic pellet feeding system according to claim 1, characterized in that: An electrostatic dust collector is also installed on one side of the collection hopper, and a screen is installed between the electrostatic dust collector and the collection hopper. The size of the screen mesh is smaller than the size of the material.

8. The plastic pellet feeding system according to claim 1, characterized in that: The feed hopper interface is located near the blower direction of the conveying pipe, which has a recessed part.

9. The plastic pellet feeding system according to claim 5, characterized in that: The pipe connector has an annular flange inside.

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