Extruder for manufacturing spraying-free engineering plastics

Abstract

The utility model belongs to the technical field of plastic extruders, and particularly relates to an extruder for manufacturing spraying-free engineering plastics, which comprises an extruder body, a transverse barrel with an opening at the tail end is arranged in the extruder body, an extrusion screw is rotatably sleeved in the barrel, the top of the front end of the barrel is communicated with a feed port, and the top of the front end of the barrel is communicated with a discharge port. A side feeding port communicated with the top of the barrel is formed in the downstream of the feeding port, a plurality of mixing assemblies are arranged on the extrusion screw corresponding to the position between the feeding port and the side feeding port, conveying threads are arranged on the extrusion screw corresponding to the downstream of the side feeding port, and a plurality of heating modules are further arranged on the extruder body. According to the plastic production extruder provided by the utility model, all raw materials can be ensured to be fully mixed, the spraying-free functional powder is prevented from being crushed by the extruder to become dull, and the plastic raw materials with metal bright texture corresponding to the spraying-free functional powder are stably and continuously produced.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic extruders, and more specifically, to an extruder for manufacturing spray-free engineering plastics. Background Art

[0002] Plastic extruders generally adopt a spiral stirring and conveying mechanism. Its screw is installed inside the barrel. The screw at the motor feeding section rotates. The screw kneads and conveys the raw materials entering the barrel from the feeding port. At the same time, the heating device installed on the outer periphery of the barrel continuously heats the raw materials inside the barrel. The raw materials softened by heating are extruded and formed through the extrusion die head at the discharge port of the barrel.

[0003] The structure of a general plastic extruder is as shown in the patent document with the patent number CN202210979813.4 and the name "An extruder for plastic processing", which includes a base, an extruder barrel. A screw is movably arranged inside the extruder barrel. One end of the screw is fixedly provided with a connecting shaft. A feeding mechanism is arranged at the upper end of the extruder barrel. A feeding mechanism is arranged at the upper end of the feeding mechanism. A control mechanism is arranged at one end of the feeding mechanism. The feeding mechanism includes a feeding bin fixedly arranged at the upper end of the extruder barrel. One end of the feeding bin is fixedly provided with a conveying pipe. A connecting bin is fixedly arranged on the outer side of the conveying pipe.

[0004] The currently common process for manufacturing spray-free engineering plastics is as follows: After the plastic and the spray-free functional powder are evenly mixed, they are extruded through an extruder, cooled by water, dried, pelletized, etc. to obtain spray-free engineering plastic particles. Then, after being formed by an injection molding machine, spray-free and aesthetically pleasing plastic parts are obtained. The most core technical point of the whole process is to manufacture spray-free engineering plastic particles.

[0005] Common spray-free functional powders include flaky-structured and shiny powders such as aluminum powder, pearlescent powder, and copper-zinc powder. However, they are generally not temperature-resistant. When encountering high temperatures, their colors turn gray, and they are easily crushed by the extruder during the processing and become dull, resulting in the inability to obtain plastic raw materials with the corresponding metallic bright texture. Summary of the Utility Model

[0006] In order to solve the problems that a general plastic extruder is prone to crushing the spray-free functional powder when making spray-free engineering plastic raw materials, resulting in its dullness, and is prone to generating high temperatures, causing the color of the spray-free functional powder to turn gray, and being unable to stably and effectively produce spray-free engineering plastics, an extruder for manufacturing spray-free engineering plastics is provided.

[0007] An extruder for manufacturing spray-free engineering plastics, comprising an extrusion body, wherein a horizontally arranged cylinder with an open end is provided in the extrusion body, an extrusion screw is rotatably sleeved in the cylinder, a feed inlet is communicated with the top of the front end of the cylinder, a side feed inlet communicating with the top of the cylinder is arranged downstream of the feed inlet, a plurality of mixing components are arranged on the extrusion screw corresponding to between the feed inlet and the side feed inlet, a conveying thread is arranged on the extrusion screw corresponding to the downstream of the side feed inlet, and a plurality of heating modules are further arranged on the extrusion body.

[0008] Further, the extrusion screw comprises a first screw and a second screw which are arranged side by side and meshed with each other.

[0009] Further, the mixing component comprises a kneading block, and the kneading blocks on the first screw and the second screw are meshed with each other.

[0010] Further, the side feed inlet is communicated with the output end of a booster pump, and the input end of the booster pump is communicated with the output end of a liquid stirring tank.

[0011] Further, an exhaust port is communicated with the top of the cylinder between the feed inlet and the side feed inlet.

[0012] Further, a liquid filling port communicating with the cylinder is arranged downstream of the side feed inlet.

[0013] Further, a vacuum pumping port communicating with the top of the cylinder is arranged downstream of the liquid filling port.

[0014] The advantages of the present utility model are as follows:

[0015] 1. Since the screw sections corresponding to the downstream of the side feed inlet are all conveying threads, when adding spray-free functional powder, it can be avoided that the powder is crushed and becomes dull, ensuring the beautiful appearance of the extruded plastic products.

[0016] 2. The structure is compact and efficient. The key lies in the design of the screw structure, which is convenient for upgrading and transforming on the basis of the original extruder equipment and is convenient for popularization and application.

[0017] 3. The design of the twin-screw can ensure that each component is fully stirred and mixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of an extruder for manufacturing spray-free engineering plastics;

[0020] Figure 2 It is a top view structure diagram of the cylinder body.

[0021] Attached drawing reference signs:

[0022] 1. Extrusion machine body; 101. Cylinder body; 2. Extrusion screw; 201. First screw; 202. Second screw; 3. Feeding port; 4. Side feeding port; 501. Kneading block; 502. Conveying thread; 6. Exhaust port; 7. Liquid filling port; 8. Vacuum pumping port; 9. Heating module; 10. Liquid stirring tank; 11. Booster pump. Specific implementation manners

[0023] In order to solve the problem that general plastic extruders are prone to crush the powder of the spray-free function when making spray-free engineering plastic raw materials, resulting in no luster and prone to generate high temperature, causing the color of the spray-free function powder to turn gray and unable to stably and effectively produce spray-free engineering plastics, an extruder for manufacturing spray-free engineering plastics is provided.

[0024] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms such as "inside", "middle" and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships shall also be regarded as the scope of implementation of the present invention when there is no substantial change in the technical content. This is stated first.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0027] As Figure 1 and 2 shown, this embodiment provides an extruder for manufacturing spray-free engineering plastics, including an extrusion body 1. A horizontally arranged barrel 101 with an open end is provided in the extrusion body 1. An extrusion screw 2 is rotatably sleeved in the barrel 101. A feed inlet 3 is connected to the top of the front end of the barrel 101. A side feed inlet 4 connected to the top of the barrel 101 is arranged downstream of the feed inlet 3. More than four sets of mixing components are arranged on the extrusion screw 2 corresponding to the positions between the feed inlet 3 and the side feed inlet 4. A conveying thread 502 is arranged on the extrusion screw 2 corresponding to the downstream of the side feed inlet 4. A plurality of heating modules 9 are also arranged on the extrusion body 1. The extrusion screw 2 includes a first screw 201 and a second screw 202 arranged side by side and meshing with each other. The mixing components include kneading blocks 501, and the kneading blocks on the first screw 201 and the second screw 202 mesh with each other.

[0028] During actual use, the mixture of the engineering plastic and other additives being evenly mixed enters the barrel 101 from the feed inlet 3, while the spray-free functional powder pre-dispersed with a liquid lubricant is input from the side feed inlet 4. Since there are no less than four sets of shear kneading blocks 501 (mixing components) between the feed inlet 3 and the side feed inlet 4, it is ensured that the engineering plastic is thoroughly plasticized into a melt through this section. All the threads on the screw downstream of the side feed inlet 4 are conveying threads 502, which ensures that while the spray-free functional powder and the melt are fused with each other under the rotation of the twin screws, the spray-free functional powder is prevented from being crushed by the shear kneading blocks. Through the twin-screw extrusion mechanism with such a structure, spray-free engineering plastics with bright colors, a pearlescent shiny feeling, and a metallic texture can be produced.

[0029] The side feeding port 4 communicates with the output end of the booster pump 11, and the input end of the booster pump 11 communicates with the output end of the liquid mixing tank 10. A liquid lubricant can be added to the liquid mixing tank 10 and stirred to pre-disperse the spray-free functional powder. The booster pump 11 can ensure the output efficiency of the spray-free functional powder.

[0030] An exhaust port 6 communicates with the top of the cylinder body 101 between the feeding port 3 and the side feeding port 4. Since gas is easily generated during the process of the cylinder body 101 being plasticized into a melt after being mixed and heated by the stirring and heating module 9, which causes the air pressure in the cylinder body 101 to rise, the exhaust port 6 is provided and a pressure relief valve can be provided on the exhaust port 6 to avoid damage to the equipment caused by excessive pressure in the cylinder body 101.

[0031] A liquid filling port 7 communicating with the cylinder body 101 is provided downstream of the side feeding port 4. The liquid filling port 7 is used to fill solvents such as liquid lubricants as needed to promote the mixing of various product components to ensure that all components are fully stirred and mixed.

[0032] A vacuum pumping port 8 communicating with the top of the cylinder body 101 is provided downstream of the liquid filling port 7. The vacuum pumping port 8 can extract the residual gas in the spray-free engineering plastic after full mixing, avoid the appearance of air bubbles on the product, which may lead to a decrease in product quality, and can accelerate the output efficiency of the material in the cylinder body 101 under the action of air pressure.

[0033] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope covered by the present invention.

Claims

1. The extruder for manufacturing spray-free engineering plastics, characterized in that, It includes an extrusion body, in which a horizontally arranged cylinder with an open end is provided. An extrusion screw is rotatably sleeved in the cylinder. The top of the front end of the cylinder is communicated with a feed inlet. A side feed inlet communicating with the top of the cylinder is arranged downstream of the feed inlet. A plurality of mixing components are arranged on the extrusion screw corresponding to the positions between the feed inlet and the side feed inlet. A conveying thread is arranged on the extrusion screw corresponding to the downstream of the side feed inlet. A plurality of heating modules are also arranged on the extrusion body.

2. The extruder for manufacturing spray-free engineering plastics according to claim 1, characterized in that, The extrusion screw includes a first screw and a second screw arranged side by side and meshing with each other.

3. The extruder for manufacturing the spray-free engineering plastics according to claim 2, wherein The mixing component includes kneading blocks, and the kneading blocks on the first screw and the second screw mesh with each other.

4. The extruder for manufacturing spray-free engineering plastics according to claim 1, characterized in that, The side feed inlet is communicated with the output end of a booster pump, and the input end of the booster pump is communicated with the output end of a liquid mixing tank.

5. The extruder for manufacturing spray-free engineering plastics according to claim 1, characterized in that, An exhaust port is communicated with the top of the cylinder between the feed inlet and the side feed inlet.

6. The extruder for manufacturing spray-free engineering plastics according to claim 1, characterized in that, A liquid filling port communicating with the cylinder is arranged downstream of the side feed inlet.

7. The extruder for manufacturing spray-free engineering plastics according to claim 6, characterized in that, A vacuum pumping port communicating with the top of the cylinder is arranged downstream of the liquid filling port.

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