Special screw structure for plastic extruding machine

Abstract

The utility model discloses a special screw rod structure for a plastic extruding machine, which relates to the technical field of plastic extruding machines and comprises a screw rod component and a machine barrel component integrally matched with the screw rod component. The screw part is sequentially provided with a screw power shaft, an anti-return section, a blanking section, a gradual melting compression section, a first mixing section, a homogenizing metering section, a double-barrier compression section and a second mixing section along the spiral conveying direction of the screw part. According to the design, based on gradual-change spiral propelling of the gradual-melting compression section in a taper rod form, the feeding amount is gradually reduced, hot melting efficiency is improved, meanwhile, injection molding materials are synchronously compressed and compacted, then based on vertical mixing of the first mixing section and average propelling of the homogenizing metering section, the injection molding materials are preliminarily mixed and conveyed, and the mixing efficiency is improved. And under the reciprocating shearing of the double-barrier compression section and the re-mixing of the second mixing section, the molten, stirred, mixed and compressed rubber material is pushed out, and the plasticizing extrusion quality is more efficient.

Description

Technical Field

[0001] The utility model relates to the field of extruders, in particular to a special screw structure for a plastic extruder. Background Technique

[0002] A plastic extruder is an important device in plastic processing. Its main function is to convert plastic raw materials into required plastic products by heating and extruding them. The use of an extruder not only improves the production efficiency of plastic products but also makes the types and uses of plastic products more diverse. The screw of the extruder, as the extrusion component of the plastic product raw materials, is an important component of the extruder. As shown in the screw for an extruder disclosed on the Chinese Patent Network (publication number CN211334494U), the screw of such a device includes a feeding section, a compression section, and a metering section. The screw groove of the feeding section is deep and can accommodate more materials, improving the feeding amount. The screw groove of the metering section is shallow, improving the plasticization effect of the plastic melt and homogenizing the melt. The depth of the screw groove of the compression section transitions from the depth of the screw groove of the feeding section to the depth of the screw groove of the metering section, facilitating the smooth flow of the melt to the discharge end with small resistance and not easily generating stagnation.

[0003] However, for the injection molding machine screws adopted in the above-mentioned disclosed patents and the existing market, there are still some deficiencies: The existing method of opening spiral grooves with different depths on the screw to achieve uniform mixing, not easily generating bubbles, and high plasticization quality during the spiral transportation of injection plastics has a relatively small impact on the variable of injection plastics. It often only plays a partial changing role and is not efficient enough for the plasticization and transportation quality of injection plastics. Therefore, those skilled in the art have provided a special screw structure for a plastic extruder to solve the problems raised in the above background technique. Summary of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a special screw structure for a plastic extruder, which solves the problem that the existing extruder screw in the above background technique is not efficient enough in the stability of plasticization and transportation of injection plastics.

[0005] To achieve the above purposes, the utility model is realized through the following technical solutions: A special screw structure for a plastic extruder includes a screw component and a barrel component integrally adapted to the screw component;

[0006] The screw component is of a multi-section structure, and along its spiral transportation direction, a screw power shaft, an anti-backflow section, a feeding section, a gradually melting compression section, a first mixing section, a homogenizing metering section, a double-barrier compression section, and a second mixing section are sequentially arranged on the screw component.

[0007] As a further technical solution of the utility model: The gradually melting compression section is of a tapered shaft structure, and the taper of the gradually melting compression section is between 1° and 3°.

[0008] As a further technical solution of the present utility model: both the first mixing section and the second mixing section are circular spiral structures, and the circular spirals of the first mixing section and the second mixing section are both divided into multiple equal parts.

[0009] As a further technical solution of the present utility model: the homogenizing and metering section is an equal pitch spiral structure.

[0010] As a further technical solution of the present utility model: the double-barrier compression section is a circular spiral staggered structure, and the number of spiral feeding grooves and discharging grooves in the double-barrier compression section is the same, and the spiral feeding grooves and discharging grooves are separated by staggered prism surfaces.

[0011] As a further technical solution of the present utility model: one end of the barrel body of the barrel component is provided with a feeding groove opposite to the feeding section.

[0012] The present utility model provides a special screw structure for a plastic extruder, which has the following beneficial effects compared with the prior art:

[0013] The screw structure of the extruder designed in this way, based on the uniform spiral propulsion of its feeding section, feeds the injection plastic evenly. Then, based on the gradual spiral propulsion of the gradually melting compression section in the form of a tapered rod, the feeding amount is gradually reduced. While improving the high efficiency of heat melting, it also synchronously compresses and compacts the injection plastic, making the transportation of the injection plastic more full, minimizing the generation of air bubbles. Furthermore, based on the vertical mixing of the first mixing section and the uniform quantity propulsion of the homogenizing and metering section, the injection plastic is preliminarily mixed and transported. Under the reciprocating shearing of the double-barrier compression section and the secondary mixing of the second mixing section, the molten, stirred, mixed, and tightly pressed rubber material is pushed out. Its plasticizing and extrusion quality is more efficient, which can effectively reduce the generation of air bubbles and improve the uniform mixing property, and is applicable to more plastic extrusion molding products. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a special screw structure for a plastic extruder;

[0015] Figure 2 It is a schematic structural diagram of the screw component in a special screw structure for a plastic extruder;

[0016] Figure 3 It is a special screw structure for a plastic extruder Figure 2 The enlarged view of part A therein;

[0017] Figure 4 It is a schematic structural diagram of the barrel component in a special screw structure for a plastic extruder.

[0018] In the figure: 1. Screw component; 11. Screw power shaft; 12. Anti-backflow section; 13. Feeding section; 14. Gradual melting and compression section; 15. First mixing section; 16. Homogenization and metering section; 17. Double-barrier compression section; 18. Second mixing section; 2. Barrel component; 21. Feeding trough. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-4 , the present invention provides a technical solution for a special screw structure for a plastic extruder: a special screw structure for a plastic extruder, including a screw component 1 and a barrel component 2 that is integrally adapted to the screw component 1. An inlet groove 21 opposite to the feeding section 13 is opened at one end of the barrel body of the barrel component 2. By opening an inlet groove 21 opposite to the feeding section 13 at one end of the barrel body of the barrel component 2 as the feeding end for injecting plastic, the injected plastic is fed into the interior of the barrel component 2, and the variable extrusion is carried out by using the screw component 1.

[0021] The screw component 1 is of a multi-section structure, and the screw component 1 is sequentially provided with a screw power shaft 11, an anti-backflow section 12, a feeding section 13, a gradual melting and compression section 14, a first mixing section 15, a homogenization and metering section 16, a double-barrier compression section 17, and a second mixing section 18 along its spiral conveying direction. The gradual melting and compression section 14 is of a tapered shaft structure, and the taper of the gradual melting and compression section 14 is between 1° and 3°. By setting the gradual melting and compression section 14 as a tapered shaft structure, when the injected plastic is evenly conveyed along the feeding section 13, it is advanced by using the taper of the gradual melting and compression section 14, and the injected plastic is gradually and spirally advanced. On the one hand, the feeding amount is gradually reduced, making the melting of the injected plastic more efficient. On the other hand, the injected plastic is synchronously compressed and compacted, making the conveying of the injected plastic more full and minimizing the generation of bubbles.

[0022] Both the first mixing section 15 and the second mixing section 18 are of a circumferential spiral structure, and the circumferential spirals of the first mixing section 15 and the second mixing section 18 are all multi-equal parts. By setting the first mixing section 15 and the second mixing section 18 as a multi-equal part circumferential spiral style, double-form stirring and mixing work can be carried out on the injected plastic, so that when it is advanced horizontally in a spiral manner, a secondary longitudinal spiral advancement is carried out, and its stirring and melting state is more sufficient and uniform.

[0023] The homogenizing metering section 16 has an equal pitch spiral structure. By using the equal - volume spiral conveying of the homogenizing metering section 16, the molten injection molding material is evenly conveyed into the double - barrier compression section 17 for staggered reciprocating shearing.

[0024] The double - barrier compression section 17 has a circumferential spiral staggered structure, and the number of spiral feed grooves and discharge grooves in the double - barrier compression section 17 is the same. The spiral feed grooves and discharge grooves are separated by staggered prism surfaces. When the injection molding material is spirally pushed into the interior of the double - barrier compression section 17, the injection molding material gradually advances from the feed groove and flips to the discharge groove through the staggered prism surface, driving secondary reciprocating shearing, making the shearing more uniform and the plasticization better.

[0025] The working principle of the present utility model is as follows: When using the screw structure as the extrusion device of the extruder, through the feed groove 21 opened on the barrel body of the barrel component 2 as the discharge end of the injection molding material, the injection molding material is fed into the interior of the barrel component 2, and the screw power shaft 11 in the screw component 1 is used as the power connection source to connect the external driving device with the screw component 1, driving the screw component 1 to rotate and extruding and pushing out the injection molding material in a variable amount;

[0026] Then, during the rotation of the screw component 1, by using the spiral propulsion of its feeding section 13, the injection molding material is evenly pushed to the gradually melting compression section 14, and by using the taper - type propulsion of the gradually melting compression section 14, the injection molding material is gradually and spirally pushed. On the one hand, the feeding amount is gradually reduced, making the melting of the injection molding material more efficient and comprehensive. On the other hand, due to the reduction of the feeding amount of the injection molding material, the injection molding material in the feeding section 13 continuously advances and compresses the injection molding material in the gradually melting compression section 14, making the injection molding material in the gradually melting compression section 14 more fully and tightly conveyed, minimizing the generation of bubbles;

[0027] Further, when the hot - melt compressed injection molding material is conveyed into the first mixing section 15, by using the multi - equal - part circumferential spiral pattern of the first mixing section 15, the injection molding material is pushed and mixed in the vertical direction, making the melting of the injection molding material more uniform and comprehensive. Then, through the equal - volume spiral conveying of the homogenizing metering section 16, the mixed injection molding material is evenly conveyed to the double - barrier compression section 17. When the injection molding material is spirally pushed into the interior of the double - barrier compression section 17, the injection molding material gradually advances from the feed groove and flips to the discharge groove through the staggered prism surface, driving secondary reciprocating shearing, making the shearing more uniform and the plasticization better. And the sheared injection molding material is extruded under the repeated spiral mixing of the second mixing section 18 with a multi - equal - part circumferential spiral pattern. It has a more efficient and comprehensive integration of melting compression, stirring and mixing, and shearing plasticization, can effectively reduce the generation of bubbles, improve the plasticization and mixing properties, and is applicable to more plastic extrusion - molded products.

[0028] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model. The structures, devices, and operation methods not specifically described and explained in the present utility model are implemented according to the conventional means in the art without special description and limitation.

Claims

1. A special screw structure for a plastic extruder, characterized in that It includes a screw component (1) and a barrel component (2) integrally adapted to the screw component (1); The screw component (1) is of a multi-segment structure, and along its spiral conveying direction, the screw component (1) is successively provided with a screw power shaft (11), an anti-backflow section (12), a feeding section (13), a gradually melting compression section (14), a first mixing section (15), a homogenizing and metering section (16), a double-barrier compression section (17), and a second mixing section (18).

2. The special screw structure for a plastic extrusion machine according to claim 1, characterized in that, The gradually melting compression section (14) is of a taper shaft structure, and the taper of the gradually melting compression section (14) is between 1° and 3°.

3. A special screw structure for a plastic extruder according to claim 1, characterized in that, Both the first mixing section (15) and the second mixing section (18) are of a circumferential spiral structure, and the circumferential spirals of the first mixing section (15) and the second mixing section (18) are both of multiple equal parts.

4. A special screw structure for a plastic extruder according to claim 1, characterized in that, The homogenizing and metering section (16) is of an equal pitch spiral structure.

5. A special screw structure for a plastic extrusion machine according to claim 1, characterized in that, The double-barrier compression section (17) is of a circumferential spiral staggered structure, and the number of spiral feeding grooves and discharging grooves of the double-barrier compression section (17) is the same, and the spiral feeding grooves and discharging grooves are separated by staggered prism surfaces.

6. The special screw structure for a plastic extruder according to claim 1, characterized in that, One end of the barrel body of the barrel component (2) is provided with a feeding groove (21) opposite to the feeding section (13).

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