Machine barrel screw rod structure for exhaust type extruder

Abstract

The utility model discloses a machine barrel screw rod structure for an exhaust type extruder, which relates to the technical field of extruder screw rods, and comprises a brake unit, a smelting unit and a compression exhaust unit which are integrally connected along the screw rod direction, the smelting unit comprises a discharging section, a gradual melting compression section and a mixing section which are arranged in the screw direction of the screw component, and the compression exhaust unit comprises a first exhaust section, a first compression section, a second exhaust section, a second compression section, a metering pressure balancing section and a tail end mixing section which are arranged in the screw direction of the screw component. According to the exhaust type extruder screw rod structure, an integrated screw propelling combination of the braking unit, the smelting unit and the compression exhaust unit is utilized, and compared with an injection molding machine screw rod component in the existing market, the exhaust type extruder screw rod structure has a multi-section type screw propelling effect, the continuity and mixing performance of injection molding material extrusion can be effectively improved, and the production efficiency is improved. And the method is suitable for more plastic extrusion molding products.

Description

Technical Field

[0001] The utility model relates to the field of extruder screws, in particular to a barrel screw structure for an exhaust extruder. Background Art

[0002] An extruder is a device widely used in the plastics industry, mainly used for processing various thermoplastic plastics, such as soft and hard polyvinyl chloride, polyethylene, etc. Since some materials contain too much moisture, gas or volatile components, it will have an adverse impact on the physical and mechanical properties, chemical properties and electrical properties of the products, and there will also be defects such as pores, bubbles, black spots and silver streaks on the surface or inside of the products, seriously affecting the appearance and performance of the products. Therefore, an exhaust plastic extruder is needed for treatment; and the screw component is an essential extrusion facility for the extruder. It is an important component for injection molding. As shown in an exhaust single-screw extruder (publication number CN219522996U) disclosed by the Chinese Patent Network, such a device uses a feeding system with a 45° installation form to convey the injection molding material into the screw feeder, and uses the screw inside it to screw and push it for extrusion molding, which has the advantages of preventing material blockage and avoiding discontinuous extrusion.

[0003] However, for the exhaust extruder equipment adopted in the above-mentioned public patent and the existing market, there are still some deficiencies: the existing method of using a single-pitch screw component to extrude and mold the injection molding material, when it screws and extrudes the injection molding material, since the injection molding material maintains the same screw extrusion pressure from the inlet to the outlet, the variable of the injection molding material during screw conveying is small, the efficiency of squeezing and exhausting the air inside the injection molding material is relatively low, and the continuous and compact stability of the injection molding material is poor. For this reason, technical personnel in this field have provided a barrel screw structure for an exhaust extruder to solve the problems raised in the above background art. Summary of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a barrel screw structure for an exhaust extruder, which solves the problems that the screw component of the existing exhaust extruder has relatively low efficiency in squeezing and exhausting the air inside the injection molding material and poor continuous extrusion compact stability as mentioned in the above background art.

[0005] To achieve the above purposes, the utility model is realized through the following technical solutions: A barrel screw structure for an exhaust extruder includes a screw component;

[0006] The screw component includes a braking unit, a melting unit, and a compression and exhaust unit that are integrally connected along the screw direction of the screw;

[0007] The braking unit includes a power connection shaft and an anti-falling and returning section arranged along the screw direction of the screw component;

[0008] The smelting unit includes a feeding section, a gradually melting and compressing section, and a kneading section arranged along the screw direction of the screw component;

[0009] The compression and exhaust unit includes a first exhaust section, a first compression section, a second exhaust section, a second compression section, a metering and pressure balancing section, and a tail-end kneading section arranged along the screw direction of the screw component.

[0010] As a further technical solution of the present invention: the feeding section is a screw structure with equal pitch, and the gradually melting and compressing section is a screw structure with gradually changing pitch.

[0011] As a further technical solution of the present invention: the gradually melting and compressing section is a tapered screw, and the helix of the gradually melting and compressing section is arranged horizontally around the axis of the screw component.

[0012] As a further technical solution of the present invention: the kneading section is divided into two spiral sections, and the helix of the kneading section is arranged vertically around the axis of the screw component.

[0013] As a further technical solution of the present invention: the spiral lengths of the first exhaust section and the second exhaust section are the same.

[0014] As a further technical solution of the present invention: both the first compression section and the second compression section are tapered screws, and the pitches of the first compression section and the second compression section are respectively greater than the pitches of the first exhaust section and the second exhaust section.

[0015] As a further technical solution of the present invention: it further includes a barrel component integrally adapted to the screw component;

[0016] The barrel body of the barrel component is provided with a feed port at one end of the screw along the feeding section;

[0017] The barrel body of the barrel component is provided with a first exhaust port at one end of the screw along the first exhaust section, and the barrel body of the barrel component is provided with a second exhaust port at one end of the screw along the second exhaust section.

[0018] The present invention provides a barrel and screw structure for an exhaust extruder, which has the following beneficial effects compared with the prior art:

[0019] The screw structure of the exhaust extruder in this design is based on the braking unit in the screw component as the braking end, driving the screw component to rotate along the barrel component. Then, by using the spiral propulsion of the feeding section in the melting unit, the injection molding material is spirally propelled for feeding. Under the progressive spiral propulsion extrusion in the gradually melting and compressing section and the stirring and mixing in the mixing section, the injection molding material is spirally propelled and conveyed in a state of gradually compressing and stirring and mixing, improving the propulsion continuity and uniform mixing of the injection molding material. Then, under the propulsion and exhaust of the two exhaust sections and the re-compression of the two compression sections in the compression and exhaust unit, the injection molding material after compression, stirring, and exhaust is extruded. Compared with the screw components of injection molding machines on the existing market, it has a multi-stage spiral propulsion effect, can effectively improve the coherence and mixing of the injection molding material extrusion, and is applicable to more plastic extrusion molding products. Brief Description of the Drawings

[0020] Figure 1 Fig. 1 is a schematic diagram of the first structure of the barrel and screw structure for an exhaust extruder;

[0021] Figure 2 Fig. 2 is a schematic diagram of the second structure of the barrel and screw structure for an exhaust extruder;

[0022] Figure 3 Fig. 3 is a schematic diagram of the structure of the screw component in the barrel and screw structure for an exhaust extruder;

[0023] Figure 4 Fig. 4 is a schematic diagram of the structure of the barrel component in the barrel and screw structure for an exhaust extruder.

[0024] In the figures: 1. Screw component; 11. Braking unit; 111. Power connection shaft; 112. Anti-falling and back-feeding section; 12. Melting unit; 121. Feeding section; 122. Gradually melting and compressing section; 123. Mixing section; 13. Compression and exhaust unit; 131. First exhaust section; 132. First compression section; 133. Second exhaust section; 134. Second compression section; 135. Metering and pressure-balancing section; 136. Tail-end mixing section; 2. Barrel component; 21. Feed inlet; 22. First exhaust port; 23. Second exhaust port. Detailed Description of the Preferred Embodiments

[0025] 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.

[0026] Please refer to Figures 1-4, the present utility model provides a technical solution for the barrel and screw structure of an exhaust extruder: a barrel and screw structure for an exhaust extruder, including a screw component 1. The screw component 1 includes a braking unit 11, a melting unit 12, and a compression and exhaust unit 13 that are integrally connected along the screw direction of the screw component 1. The braking unit 11 includes a power connection shaft 111 and an anti-falling and backfeeding section 112 arranged along the screw direction of the screw component 1. Based on the braking unit 11 in the screw component 1 as the power source, it drives the combination of the melting unit 12 and the compression and exhaust unit 13 to rotate along the barrel component 2, and performs multi-stage extrusion molding work on the injection molding material.

[0027] The melting unit 12 includes a feeding section 121, a gradually melting and compressing section 122, and a mixing section 123 arranged along the screw direction of the screw component 1. The feeding section 121 is a screw structure with equal pitch, and the gradually melting and compressing section 122 is a screw structure with gradually changing pitch. The injection molding material after feeding is spirally pushed forward by the feeding section 121. During the gradual forward conveying process, the gradually changing spiral of the gradually melting and compressing section 122 is used to gradually slow down the injection molding material in the spiral propulsion. The feeding and propulsion rate at its front end remains unchanged, while the propulsion rate at the rear end gradually slows down. Using the propulsion and extrusion force from the front end to the rear end, on the one hand, it serves as the propulsion power to push the injection molding material to gradually spiral forward, and on the other hand, it serves as the extrusion power to make the injection molding material more compact during the spiral propulsion process to ensure the continuity of the subsequent extrusion molding of the injection molding material.

[0028] The gradually melting and compressing section 122 is a tapered screw, and the spiral of the gradually melting and compressing section 122 is arranged horizontally around the axis direction of the screw component 1. The mixing section 123 is divided into two spiral sections, and the spiral of the mixing section 123 is arranged vertically around the axis direction of the screw component 1. When the injection molding material is tightly pressed and propelled horizontally by the gradually melting and compressing section 122, when the injection molding material is pushed to the position of the mixing section 123, the longitudinal spiral propulsion of the mixing section 123 is used to stir and mix the injection molding material in the longitudinal direction, making the injection molding material mix more fully.

[0029] The compression and exhaust unit 13 includes a first exhaust section 131, a first compression section 132, a second exhaust section 133, a second compression section 134, a metering and pressure-balancing section 135, and a tail-end mixing section 136 arranged along the screw direction of the screw component 1. The spiral lengths of the first exhaust section 131 and the second exhaust section 133 are the same. Both the first compression section 132 and the second compression section 134 are tapered screws, and the pitches of the first compression section 132 and the second compression section 134 are respectively greater than the pitches of the first exhaust section 131 and the second exhaust section 133. By using the exhaust and tight-pressing combination of the first exhaust section 131 and the first compression section 132, and the exhaust and tight-pressing combination of the second exhaust section 133 and the second compression section 134, a two-stage form of exhaust and compression process is carried out on the injection molding material, so that the injection molding material is tightly pressed again after exhaust, and then under the measurement spiral propulsion of the metering and pressure-balancing section 135 and the re-stirring and mixing of the tail-end mixing section 136, the injection molding material is extruded and formed.

[0030] It further includes a barrel component 2 integrally adapted to the screw component 1. The barrel body of the barrel component 2 is provided with a feed port 21 at one end of the screw in the feeding section 121. By providing the feed port 21 opposite to the feeding section 121 on the barrel body of the barrel component 2 as the feeding end of the injection molding material, the injection molding material is fed into the barrel component 2, and it is spirally propelled and fed by the feeding section 121.

[0031] The barrel body of the barrel component 2 is provided with a first exhaust port 22 at one end of the screw in the first exhaust section 131, and the barrel body of the barrel component 2 is provided with a second exhaust port 23 at one end of the screw in the second exhaust section 133. By providing the first exhaust port 22 and the second exhaust port 23 on the barrel body of the barrel component 2 corresponding to the first exhaust section 131 and the second exhaust section 133, a double evacuation work is carried out on the air in the injection molding material.

[0032] The working principle of the present utility model is as follows: When using the barrel screw as an extrusion device of an exhaust type extruder, based on the feed port 21 provided on the barrel body of the barrel component 2 as the feeding end, the injection molding material is fed into the barrel component 2, and then the braking unit 11 in the screw component 1 is used as the braking end to drive the screw component 1 to rotate along the barrel component 2, and the injection molding material is spirally propelled.

[0033] Further, when the injection molding material is propelled spirally along the melting unit 12, the injection molding material after feeding is propelled spirally by the feeding section 121. During the progressive forward conveying process, the gradual spiral of the gradually melting and compressing section 122 is used to gradually slow down the injection molding material during the spiral propulsion. Since the feeding and propulsion rate at the front end remains unchanged and the propulsion rate at the rear end gradually slows down, the propulsion and extrusion pressure of the front end on the rear end is used to make the injection molding material more compact during the spiral propulsion process, so as to ensure the continuity of the subsequent extrusion molding of the injection molding material. When the subsequent injection molding material is pushed to the mixing section 123, the longitudinal spiral propulsion of the mixing section 123 is used to stir and mix the injection molding material in the longitudinal direction, making the mixing of the injection molding material more sufficient;

[0034] Furthermore, when the injection molding material after compaction and mixing is conveyed into the compression and exhaust unit 13, the exhaust and compaction combination of the first exhaust section 131 and the first compression section 132, as well as the exhaust and compaction combination of the second exhaust section 133 and the second compression section 134, are used to perform a two-stage exhaust and compression process on the injection molding material. The air in the injection molding material is discharged through the first exhaust port 22 and the second exhaust port 23, and a re-compaction process is performed on the injection molding material after exhaust. Then, under the measurement spiral propulsion of the measurement and pressure balancing section 135 and the re-stirring and mixing of the tail mixing section 136, the injection molding material is extruded and formed. It has multi-stage mixing, compression, and exhaust functions, can effectively remove the air in the injection molding material, improve the mixing and compaction continuity of the injection molding material, and is applicable to the extrusion molding work of more types of injection molding materials.

[0035] The above is only the preferred implementation mode of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, 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, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A barrel screw structure for a venting extruder, characterized in that: It comprises a screw component (1); The screw component (1) comprises a braking unit (11), a melting unit (12), and a compression exhaust unit (13) which are integrally connected and arranged along the screw direction; The braking unit (11) comprises a power connection shaft (111) and a material-dropping prevention and return section (112) arranged along the screw direction of the screw component (1); The smelting unit (12) comprises a feeding section (121), a gradual melting compression section (122), and a mixing section (123) arranged along the screw direction of the screw component (1); The compression exhaust unit (13) comprises a first exhaust section (131) arranged along the screw direction of the screw component (1), a first compression section (132), a second exhaust section (133), a second compression section (134), a metering and pressure-balancing section (135), and a tail end mixing section (136).

2. A barrel screw structure for a venting extruder according to claim 1, characterized in that: The material discharge section (121) is a screw structure with a constant pitch, and the gradual melting and compression section (122) is a screw structure with a gradually variable pitch.

3. The barrel screw structure for a venting extruder according to claim 1, characterized in that: The gradually melting compression section (122) is a tapered screw, and the spiral of the gradually melting compression section (122) is arranged horizontally and circumferentially in the direction of the shaft of the screw component (1).

4. The barrel screw structure for a venting extruder according to claim 1, characterized in that: The mixing section (123) is divided into two spiral sections, and the spiral of the mixing section (123) is arranged in a spiral manner perpendicular to the axis direction of the screw component (1).

5. The barrel screw structure for a venting extruder according to claim 1, characterized in that: The spiral lengths of the first exhaust section (131) and the second exhaust section (133) are the same.

6. The barrel screw structure for a venting extruder according to claim 1, characterized in that: The first compression section (132) and the second compression section (134) are both tapered screws, and the pitches of the first compression section (132) and the second compression section (134) are respectively greater than the pitches of the first exhaust section (131) and the second exhaust section (133).

7. The barrel screw structure for a venting extruder according to claim 1, characterized in that: It also includes a barrel component (2) integrally adapted with the screw component (1); The barrel of the barrel component (2) is provided with a feed inlet (21) at one end of the screw of the feed discharge section (121); The barrel of the barrel component (2) is provided with a first exhaust port (22) along one end of the screw of the first exhaust section (131), and the barrel of the barrel component (2) is provided with a second exhaust port (23) along one end of the screw of the second exhaust section (133).

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