Cylinder screw structure for extruder

Abstract

The invention relates to the technical field of extruder screws, and discloses a machine barrel screw structure for an extruder, the machine barrel screw structure comprises a first machine barrel, a second machine barrel and a third machine barrel are sequentially arranged on the left side of the first machine barrel, and screws are arranged in the first machine barrel, the second machine barrel and the third machine barrel. By arranging the large-outer-diameter feeding section and the outer-diameter transition section, the extruder can adapt to more types of materials, especially fluffy materials and plastic materials in different shapes, so that the feeding stability and plasticizing uniformity of the materials are improved; the outer diameter of the screw rod is gradually changed, so that materials are compressed and mixed in different sections of the screw rod to different degrees, the plasticizing and mixing effects of the materials are optimized, and the high quality of a final product is ensured; through the segmented design of the machine barrel, the later maintenance convenience is improved, the replacement and cleaning of the screw rod and the machine barrel part are simpler and more convenient, and meanwhile, the maintenance cost is effectively controlled through the segmented structure of the machine barrel.

Description

Technical Field

[0001] The present invention relates to the technical field of extruder screws, and specifically to a barrel screw structure for an extruder. Background Art

[0002] In the traditional extruder screw structure, the design of the screw is mostly single-segment or a small number of segments, and the processing effect of the material is limited to a large extent. In the prior art, although the screw of the extruder can meet the processing requirements of plastics to a certain extent, there are problems such as a large floor area of the production line, an overly long production line length, and poor adaptability to different material shapes.

[0003] Since the material is not fully plasticized and mixed when entering the feeding section, the processing effect is uneven and the plasticization is incomplete, thus affecting the quality of the final product. In addition, the traditional screw design has high maintenance costs and complex operations, bringing great inconvenience to production.

[0004] Therefore, there is an urgent need for a new screw design that can effectively solve these problems and improve the performance and production efficiency of the extruder.

[0005] In view of this, we propose a barrel screw structure for an extruder. Summary of the Invention

[0006] The purpose of the present invention is to provide a barrel screw structure for an extruder to solve the problems existing in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: A barrel screw structure for an extruder, including a first barrel, a second barrel and a third barrel are sequentially arranged on the left side of the first barrel, and a screw is arranged in the first barrel, the second barrel and the third barrel.

[0008] Preferably, a feeding port is opened on the first barrel, the first barrel and the second barrel are fixedly connected by a first screw, and the second barrel and the third barrel are fixedly connected by a second screw.

[0009] Preferably, the surface of the screw is provided with screw edges, the front section of the screw is set as a large-diameter feeding section, and the large-diameter feeding section is located below the feeding port.

[0010] Preferably, the middle section of the screw is set as an outer diameter gradual change section, and in the outer diameter gradual change section, the outer diameter of the screw gradually changes from large to small.

[0011] Preferably, the rear section of the screw is set as a small-diameter discharging section, and the screw edge grooves in the small-diameter discharging section are quantitatively set.

[0012] Preferably, in the large-diameter feeding section, the outer diameter of the screw edge is large and the screw edge groove is deep.

[0013] Preferably, in the outer diameter gradual change section, the outer diameter of the screw rib of the screw gradually changes from a large outer diameter to a small outer diameter along with the screw, and the screw rib groove of the screw in the outer diameter gradual change section becomes shallower from deeper.

[0014] By means of the above technical solution, the present invention provides a barrel and screw structure for an extruder, which has at least the following beneficial effects: (1) By providing a large outer diameter feeding section and an outer diameter gradual change section, the extruder of the present invention can adapt to more types of materials, especially fluffy materials and plastic materials of different shapes, thereby improving the feeding stability and plasticizing uniformity of the materials. (2) By setting the gradual change of the outer diameter of the screw, the materials are compressed and mixed to different degrees in different sections of the screw, optimizing the plasticizing and mixing effects of the materials and ensuring the high quality of the final product.

[0015] (3) By designing the barrel in sections, the convenience of later maintenance is improved, the replacement and cleaning of the screw and barrel components are made simpler, and at the same time, the sectional structure of the barrel effectively controls the maintenance cost.

[0016] (4) By optimizing the screw, the present invention can process materials more efficiently, shorten the length of the production line, save the floor area of the equipment, help reduce the production cost of the enterprise, and at the same time, the quantitative and stable discharge section and the reasonable outer diameter gradual change design make the extrusion of the materials more uniform and stable, and the production efficiency is significantly improved. Description of the Drawings

[0017] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application: Figure 1 It is a cross-sectional view of the overall structure of the present invention; Figure 2 It is an exploded view of the barrel structure in the present invention; Figure 3 It is a plan view of the screw structure in the present invention.

[0018] In the figure: 1. First barrel; 11. Feeding port; 2. Second barrel; 3. Third barrel; 4. Screw; 41. Screw rib; 5. Large outer diameter feeding section; 6. Outer diameter gradual change section; 7. Small outer diameter discharging section; 8. First screw; 9. Second screw. Detailed 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. 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.

[0020] Please refer to Figures 1 - 3 As shown, the present invention provides a barrel-screw structure for an extruder, including a first barrel 1. A second barrel 2 and a third barrel 3 are sequentially arranged on the left side of the first barrel 1. A screw 4 is arranged in the first barrel 1, the second barrel 2, and the third barrel 3. A feed inlet 11 is provided on the first barrel 1. The first barrel 1 and the second barrel 2 are fixedly connected by a first screw 8, and the second barrel 2 and the third barrel 3 are fixedly connected by a second screw 9. The segmented design of the barrel improves the convenience of later maintenance, makes the replacement and cleaning of the screw and barrel components more convenient, and at the same time controls the cost of barrel maintenance. At the same time, the material enters the large-diameter feeding section 5 of the screw 4 through the feed inlet 11 of the first barrel 1.

[0021] The surface of the screw 4 is provided with screw ridges 41. The front section of the screw 4 is set as a large-diameter feeding section 5, and the large-diameter feeding section 5 is located below the feed inlet 1. In the large-diameter feeding section 5, the outer diameter of the screw ridges 41 of the screw 4 is large, and the groove depth of the screw ridges 41 is deep. In the large-diameter feeding section 5, the material enters the barrel through the feed inlet 11 of the first barrel 1, and the feeding is realized through the spiral propulsion of the screw 4. In the large-diameter feeding section 5, the groove of the screw ridge 41 of the screw 4 is deepened for good feeding, and the feeding stroke is shortened, ensuring that when the material enters the extruder, it can smoothly pass through the feed inlet 11 and be effectively grasped by the screw 4. Through this design, the extruder can adapt to processing fluffy and irregularly shaped granular materials, ensuring stable feeding of the material.

[0022] The middle section of the screw 4 is set as an outer-diameter gradual change section 6, in which the outer diameter of the screw 4 gradually changes from a large diameter to a small diameter. In the outer-diameter gradual change section 6, the outer diameter of the screw ridges 41 of the screw 4 gradually changes from a large diameter to a small diameter along with the change of the outer diameter of the screw 4, and the groove of the screw ridges 41 of the screw 4 gradually becomes shallower from deep. The outer-diameter gradual change section 6 is connected to the large-diameter feeding section 5. The outer diameter of the screw 4 in the outer-diameter gradual change section 6 gradually changes from a large diameter to a small diameter. At the same time, the tooth groove on the screw 4 gradually becomes shallower from deep along with the diameter change of the screw 4, forming high compression and gradual plasticization. The outer diameter gradual change section 6 enables the material to be compressed at this stage, promoting the effective plasticization of the material under high pressure, effectively optimizing the fluidity and plasticization effect of the material, and ensuring the uniformity and quality of the material.

[0023] The rear section of the screw 4 is set as a small outer diameter discharging section 7, and the groove of the screw edge 41 of the screw 4 in the small outer diameter discharging section 7 is set quantitatively; The small outer diameter discharging section 7 is connected to the outer diameter gradual change section 6. In the small outer diameter discharging section 7, the groove of the screw edge 41 on the screw 4 extrudes and forms with constant pressure and quantity. At the same time, various mixing units can be added at the end of the small outer diameter screw to stir and mix to enhance the quality of the material finished product; The small outer diameter discharging section 7 ensures the stable discharging and quantitative output of the material through the quantitatively structured screw edge 41 groove. The material is finally compressed in this section and discharged through a precise quantitative control system to ensure the uniformity and consistency of the finished product.

[0024] The inner diameters of the three-section barrel change in the same way as the large and small outer diameters of the screw and are precisely and closely fitted for the forming and processing of various materials; Compared with the plastic machine screw components on the existing market, it has the same multi-section spiral propulsion effect, can effectively improve the coherence of plastic extrusion, the large and small diameters are suitable for more material shapes, can shorten the production line length and save floor area, the barrel is segmented for convenient later maintenance, low cost, and is applicable to more plastic extrusion molding products.

[0025] When the barrel and screw structure for an extruder of the present invention is in use, the first barrel 1, the second barrel 2 and the third barrel 3 are fixedly assembled by the first screw 8 and the second screw 9. The material enters the barrel through the feed port 11 on the first barrel 1. The screw 4 in the large outer diameter feeding section 5 in the barrel grabs the material, and realizes feeding through the spiral propulsion of the screw 4. The material enters the outer diameter gradual change section 6 along with the push of the screw 4. The screw 4 in the outer diameter gradual change section 6 gradually changes from a large outer diameter to a small outer diameter. At the same time, the tooth groove on the screw 4 changes from deep to shallow along with the diameter change of the screw 4. The material is compressed in the outer diameter gradual change section 6, promoting the effective plasticization of the material under high pressure. The plasticized material finally enters the small outer diameter discharging section 7 along with the push of the screw 4. Through the quantitatively structured screw edge 41 groove on the screw 4 in the small outer diameter discharging section 7, the stable discharging and quantitative output of the material are ensured, and the material is finally compressed in this section.

[0026] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A barrel-screw structure for an extruder, comprising a first barrel (1), characterized in that: A second barrel (2) and a third barrel (3) are successively arranged on the left side of the first barrel (1), and a screw (4) is arranged in the first barrel (1), the second barrel (2) and the third barrel (3).

2. The barrel and screw structure for an extruder according to claim 1, characterized in that: A feed inlet (11) is formed in the first barrel (1). The first barrel (1) and the second barrel (2) are fixedly connected by a first screw (8), and the second barrel (2) and the third barrel (3) are fixedly connected by a second screw (9).

3. A barrel screw structure for an extruder according to claim 1, characterized in that: A thread crest (41) is arranged on the surface of the screw (4). The front section of the screw (4) is a large-diameter feed section (5), and the large-diameter feed section (5) is located below the feed inlet (1).

4. A barrel screw structure for an extruder according to claim 1, characterized in that: The middle section of the screw (4) is an outer-diameter gradual change section (6), and in the outer-diameter gradual change section (6), the outer diameter of the screw (4) gradually changes from a large outer diameter to a small outer diameter.

5. The barrel screw structure for an extruder according to claim 1, characterized in that: The rear section of the screw (4) is a small-diameter discharge section (7), and the groove of the thread crest (41) of the screw (4) in the small-diameter discharge section (7) is set quantitatively.

6. The barrel and screw structure for an extruder according to claim 3, wherein: In the large-diameter feed section (5), the outer diameter of the thread crest (41) of the screw (4) is large and the groove of the thread crest (41) is deep.

7. The barrel screw structure for an extruder according to claim 4, characterized in that: In the outer-diameter gradual change section (6), the outer diameter of the thread crest (41) of the screw (4) gradually changes from a large outer diameter to a small outer diameter as the screw (4) changes, and the groove of the thread crest (41) of the screw (4) in the outer-diameter gradual change section (6) gradually becomes shallower from being deep.

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