Special screw rod for processing plant fibers

Abstract

A special screw for processing plant fibers comprises a mixing section, a first mixing head and a second mixing head are arranged on the mixing section, a barrier groove is formed in the first mixing head, the second mixing head is arranged at the rear end of the first mixing head, and clamping teeth are arranged on the second mixing head; materials and wood chips enter from a barrier groove with an opening facing an inlet, move to the end of the barrier groove along the barrier groove inclining by 45 degrees, enter a barrier groove with a side opening facing an outlet along a material channel and move out of a first mixing head from the barrier groove, and barrier mixing is achieved; materials and wood chips are sheared through the clamping teeth of the second mixing head, plant fibers are fully and uniformly sheared along the transverse passing grooves and the radial passing grooves which are formed in a crossed mode, and through barrier mixing of the first mixing head and the second mixing head and strong mixing of the blades, plasticizing is guaranteed, and full and uniform shearing of the plant fibers can also be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of feeding screws, and in particular to a screw specifically designed for processing plant fibers. Background Technology

[0002] Plant fibers, primarily wood chips from agricultural crops, are added to plastics to create plastic granules containing plant fibers. The fiber (wood chips) is a fully biodegradable plastic, PLA (polylactic acid), a cereal fiber. The life cycle of PLA begins with the plant's photosynthesis, absorbing carbon dioxide and releasing oxygen. After harvesting, the plant is sent to a factory for processing to extract glucose, ferment into lactic acid, and then polymerize into PLA cereal fibers. These PLA granules are then used in various common plastic processing techniques, such as thermoforming and injection molding, to create a wide variety of products.

[0003] However, the gases produced during the production of PLA plastic products are somewhat corrosive. When some wood chips are added to the plastic, the plastic becomes less fluid after melting and cannot be completely sheared. Furthermore, the wood chips cannot be fully plasticized. To solve the above problems, a special screw for processing plant fibers is proposed. Utility Model Content

[0004] The purpose of this invention is to solve the problems that after adding wood chips, the plastic melts and becomes less fluid, making it impossible to cut completely, and the wood chips cannot be fully plasticized.

[0005] The present invention adopts the following technical solution:

[0006] A special screw for processing plant fibers includes a mixing section, wherein a first mixing head and a second mixing head are provided on the mixing section, the first mixing head is provided with a barrier groove, the rear end of the first mixing head is provided with a second mixing head, and the second mixing head is provided with a retaining tooth. The retaining tooth is densely arranged on the second mixing head and forms two through grooves for mixing and passing the material.

[0007] Furthermore, there are several groups of barrier grooves, and the whole group is inclined at 45 degrees to the screw axis. Each group of barrier grooves includes a first barrier groove and a second barrier groove. The first barrier groove and the second barrier groove are both semi-closed structures. The opening of the first barrier groove faces the inlet, and the opening of the second barrier groove faces the outlet. The head and end of the first barrier groove are connected to the second barrier groove in the same group by a material channel. The cross-sectional area of ​​the material channel is much smaller than the cross-sectional area of ​​the first barrier groove and the second barrier groove.

[0008] Furthermore, there are several clamping teeth, evenly distributed on the second mixing head. The clamping teeth are inclined at 45 degrees to the screw shaft. The orientation of the clamping teeth is the same as that of the barrier groove. Each clamping tooth is frustum-shaped with a rhomboid bottom. The bottom distance between two adjacent horizontal clamping teeth is 1.25 mm and the top distance is 2.5 mm. The bottom distance between two adjacent radial clamping teeth is 2.5 mm and the top distance is 5 mm. A 45-degree inclined transverse passage groove with an upper diameter of 5 mm and a lower diameter of 2.5 mm is formed between two adjacent sets of transverse clamping teeth. A radial passage groove with an upper diameter of 2.5 mm and a lower diameter of 1.25 mm is formed between two adjacent sets of radial clamping teeth. The two types of passage grooves are intersected for material passage.

[0009] Furthermore, a compression section is provided on the other side of the mixing section, and the spiral edges of the compression section are all blunted and the bottom diameter gradually changes.

[0010] Furthermore, a feeding section is provided on the other side of the compression section, wherein the bottom diameter and outer diameter of the screw thread of the feeding section are of equal depth;

[0011] Furthermore, a connecting section is provided on the other side of the feeding section for connecting the entire screw to an external power source;

[0012] Furthermore, both the inlet and outlet of the first mixing head are chamfered to reduce blockage at the feed and discharge points.

[0013] The beneficial effects of this utility model are:

[0014] The material and wood chips enter through the barrier trough with the opening facing the inlet, move along the barrier trough inclined at 45 degrees to its end, enter the barrier trough with the opening facing the outlet on the side along the material channel, and move out of the first mixing head through the barrier trough to achieve barrier mixing.

[0015] The material and wood chips are sheared by the cleats of the second mixing head. The plant fibers are fully and evenly sheared by the cross-shaped transverse and radial through grooves. The barrier mixing and blade mixing of the first and second mixing heads ensure both plasticization and full and even shearing of the plant fibers.

[0016] Meanwhile, the entire screw is made of JYN3 quenching electroplating process, the electroplating layer has anti-corrosion function, and the electroplating layer can meet the surface smoothness requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a special screw for processing plant fibers according to a utility model.

[0018] Figure 2This is a partial structural diagram of a special screw for processing plant fibers according to a utility model.

[0019] Figure 3 This is a partial structural schematic diagram of a special screw for processing plant fibers according to a utility model.

[0020] In the diagram: 1. Connecting section; 2. Feeding section; 3. Compression section; 4. Mixing section; 5. First mixing head; 6. Second mixing head; 7. Barrier groove; 8. Gear; 9. First barrier groove; 10. Second barrier groove. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Example 1

[0025] This utility model provides a special screw for processing plant fibers, including a mixing section 4, a first mixing head 5 and a second mixing head 6 on the mixing section 4, a barrier groove 7 on the first mixing head 5, a second mixing head 6 at the rear end of the first mixing head 5, and a retaining tooth 8 on the second mixing head 6. The retaining tooth 8 is densely arranged on the second mixing head 6 and forms two through grooves for mixing and passing the material.

[0026] Furthermore, there are several sets of barrier grooves 7, and the whole set is inclined at 45 degrees to the screw axis. Each set of barrier grooves 7 includes a first barrier groove 9 and a second barrier groove 10. The first barrier groove 9 and the second barrier groove 10 are both semi-closed structures. The opening of the first barrier groove 9 faces the inlet, and the opening of the second barrier groove 10 faces the outlet. The head and end of the first barrier groove 9 are connected to the second barrier groove 10 in the same set by material channels. The cross-sectional area of ​​the material channels is much smaller than the cross-sectional area of ​​the first barrier groove 9 and the second barrier groove 10.

[0027] Furthermore, there are several cleats 8, evenly distributed on the second mixing head 6. The cleats 8 are inclined at 45 degrees to the screw shaft. The orientation of the cleats 8 is the same as that of the barrier groove 7. Each cleat 8 is frustum-shaped with a rhomboid bottom. The bottom distance between two adjacent lateral cleats 8 is 1.25 mm and the top distance is 2.5 mm. The bottom distance between two adjacent radial cleats 8 is 2.5 mm and the top distance is 5 mm. A 45-degree inclined transverse passage groove with an upper diameter of 5 mm and a lower diameter of 2.5 mm is formed between two adjacent sets of transverse cleats 8. A radial passage groove with an upper diameter of 2.5 mm and a lower diameter of 1.25 mm is formed between two adjacent sets of radial cleats 8. The two types of passage grooves are intersected for material passage.

[0028] Furthermore, a compression section 3 is provided on the other side of the mixing section 4, and the spiral edges of the compression section 3 are all blunted and the bottom diameter gradually changes.

[0029] Furthermore, a feeding section 2 is provided on the other side of the compression section 3, and the bottom diameter and outer diameter of the screw of the feeding section 2 are of equal depth;

[0030] Furthermore, a connecting section 1 is provided on the other side of the feeding section 2 for connecting the entire screw to an external power source;

[0031] Furthermore, the inlet and outlet of the first mixing head 5 are both chamfered to reduce blockage at the feed and discharge points.

[0032] Working principle:

[0033] In operation, the integral screw extends into the barrel and is mounted on an external power source via connecting section 1. Material is fed into the feed section 2, and the plastic and wood chips enter the compression section 3 along the feed section 2. The compression section 3 has a suitable ratio, which neither increases shear heat nor causes uneven feeding. The material enters the mixing section 4 as a whole. The inlet and outlet of the first mixing head 5 are chamfered to reduce blockage at the feed and outlet. The material and wood chips enter from the barrier groove 7 with the opening facing the inlet, and move to its end along the 45-degree inclined barrier groove 7. The material and wood chips enter the first mixing head 5 along the openings of several sets of barrier grooves 7 facing the inlet of the first barrier groove 9. The material flows along the material passage with a smaller cross-sectional area. The material enters the second barrier groove 10. Since there is a lot of material at the inlet of the first mixing head 5, it is squeezed into the first barrier groove 9 and the material is squeezed. At the same time, since the cross-sectional area of ​​the material channel is small, the material is further mixed. The material moves to the outlet along the opening of the second barrier groove 10, leaves the first mixing head 5, and achieves barrier mixing. Then it enters the second mixing head 6. Under the action of the tooth 8 of the second mixing head 6, the material and wood chips are sheared. Along the intersecting transverse and radial through grooves, the plant fibers are fully and evenly sheared. Through the barrier mixing of the first mixing head 5 and the strong mixing of the blades of the second mixing head 6, plasticization is ensured, and the plant fibers are fully and evenly sheared.

[0034] Meanwhile, the entire screw is made of JYN3 quenching electroplating process, the electroplating layer has anti-corrosion function, and the electroplating layer can meet the surface smoothness requirements.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A screw specifically for processing plant fibers, characterized in that, It includes a mixing section (4), on which a first mixing head (5) and a second mixing head (6) are provided. The first mixing head (5) is provided with a barrier groove (7), and the rear end of the first mixing head (5) is provided with a second mixing head (6). The second mixing head (6) is provided with a locking tooth (8). The locking tooth (8) is densely arranged on the second mixing head (6) and forms two through grooves for the material to be mixed and passed through.

2. The screw for processing plant fibers according to claim 1, characterized in that, The barrier groove (7) is in several groups and is inclined at 45 degrees to the screw shaft. Each group of barrier grooves (7) includes a first barrier groove (9) and a second barrier groove (10). The first barrier groove (9) and the second barrier groove (10) are both semi-closed structures. The opening of the first barrier groove (9) faces the inlet, and the opening of the second barrier groove (10) faces the outlet. The head and end of the first barrier groove (9) are connected to the second barrier groove (10) in the same group by material channels. The cross-sectional area of ​​the material channels is much smaller than that of the first barrier groove (9) and the second barrier groove (10).

3. The screw for processing plant fibers according to claim 2, characterized in that, There are several teeth (8) and they are evenly distributed on the second mixing head (6). The teeth (8) are inclined at 45 degrees to the screw shaft. The orientation of the teeth (8) is the same as that of the barrier groove (7). Each tooth (8) is frustum-shaped. The bottom of the tooth (8) is rhomboid. The bottom distance between two adjacent teeth (8) is 1.25 mm and the top distance is 2.5 mm. The bottom distance between two adjacent teeth (8) is 2.5 mm and the top distance is 5 mm. A transverse passage groove with an upper diameter of 5 mm and a lower diameter of 2.5 mm is formed between two adjacent sets of transverse teeth (8). A radial passage groove with an upper diameter of 2.5 mm and a lower diameter of 1.25 mm is formed between two adjacent sets of radial teeth (8). The two types of passage grooves are intersected for the passage of materials.

4. The screw for processing plant fibers according to claim 3, characterized in that, A compression section (3) is provided on the other side of the mixing section (4), and the spiral edges of the compression section (3) are all blunted and the bottom diameter gradually changes.

5. A special screw for processing plant fibers according to claim 4, characterized in that, A feeding section (2) is provided on the other side of the compression section (3), wherein the bottom diameter and outer diameter of the screw thread of the feeding section (2) are of equal depth.

6. A special screw for processing plant fibers according to claim 5, characterized in that, A connecting section (1) is provided on the other side of the feeding section (2) for connecting the overall screw to an external power source.

7. A special screw for processing plant fibers according to claim 6, characterized in that, The inlet and outlet of the first mixing head (5) are both chamfered to reduce blockage at the feed and discharge points.

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