A die and extruder

Abstract

The application discloses a die and an extruder. The die comprises a first die body, which is detachably connected with a head of the extruder; a second die body, which is detachably connected with the first die body; a first die hole is arranged on the first die body; a second die hole is arranged on the second die body; a discharge end of the first die hole is in communication with a feeding end of the second die hole; a positioning flow guide pipe is arranged in the first die hole or the second die hole; an outer diameter of a discharge end of the positioning flow guide pipe is smaller than an inner diameter of a discharge end of the second die hole, so that a first gap is formed between the positioning flow guide pipe and the second die hole. The application solves the technical problem that, due to the straight-through structure of the die, the nylon glass fiber melt cannot be effectively cooled, and the fiber film attached to the surface of the nylon glass fiber melt cannot be removed, which easily causes the surface of the obtained granules to be attached with the fiber film or surface defects to occur, and affects the quality of the final product.

Description

Technical Field

[0001] This application relates to the field of plastic production technology, and more specifically, to a die. Background Technology

[0002] Nylon reinforced with glass fiber is a raw material commonly used in the production of automotive parts and other products. The melt of this material has high viscosity, and the cooling rate significantly affects the appearance and properties of its particles. During extrusion from a die, the nylon reinforced with glass fiber melt is prone to forming a fibrous film on the melt surface due to insufficient dispersion of the glass fiber. This film may also contain trace amounts of glass fiber flocs that have detached due to friction, further affecting the melt's flow characteristics and cooling effect.

[0003] In the prior art, the die orifice is usually a straight-through structure. The nylon-glass fiber reinforced melt enters directly into the straight orifice through the extruder head and flows out from the outlet. During the entire process, the nylon-glass fiber reinforced melt cannot be effectively cooled, nor can the fiber film attached to the surface of the nylon-glass fiber reinforced melt be removed. This can easily lead to the fiber film adhering to the surface of the resulting granules or surface defects, affecting the final product quality.

[0004] In related technologies, the die structure is a straight-through structure, which cannot effectively cool the nylon-glass fiber reinforced melt or remove the fiber film adhering to the surface of the nylon-glass fiber reinforced melt. This easily leads to the formation of granules with fiber film adhering to the surface or surface defects, affecting the final product quality. Currently, no effective solution has been proposed. Summary of the Invention

[0005] The main objective of this application is to provide a die to solve the problem that, due to the die's straight-through structure, it is impossible to effectively cool the nylon-glass fiber reinforced melt or remove the fiber film adhering to the surface of the nylon-glass fiber reinforced melt; this easily leads to the formation of granules with fiber film adhering to the surface or surface defects, affecting the final product quality.

[0006] To achieve the above objectives, a mouth mold is provided according to one aspect of this application.

[0007] The die according to this application includes: a first die body, which is detachably connected to the die head of the extruder;

[0008] The second die body is detachably connected to the first die body;

[0009] The first die body is provided with a first die hole;

[0010] The second die body is provided with a second die hole;

[0011] The discharge end of the first die hole is connected to the feed end of the second die hole;

[0012] A positioning guide tube is installed in the first mold hole or the second mold hole. The outer diameter of the discharge end of the positioning guide tube is smaller than the inner diameter of the discharge end of the second mold hole, so that a first gap is formed between the positioning guide tube and the second mold hole.

[0013] Furthermore, a through waist-shaped groove is provided in the middle of the feed end of the first die body along the length direction, and the bottom and sidewalls of the through waist-shaped groove at both ends are formed by arc transition to form a guide surface.

[0014] The bottom of the guide surface has a main channel, which is inclined and connected to the positioning guide pipe.

[0015] Furthermore, the positioning guide tube includes a first circular tube and a second circular tube connected sequentially along the material conveying direction.

[0016] Furthermore, an annular limiting protrusion is provided on the outer circumferential surface at the connection between the first circular tube and the second circular tube;

[0017] The first mold hole is embedded with an annular inner step;

[0018] The annular limiting protrusion matches the annular inner step.

[0019] Furthermore, the positioning guide tube has a first guide hole and a second guide hole connected in sequence in the middle. The inner diameter of the first guide hole gradually decreases along the material flow direction. The second guide hole is a straight hole, and the inner diameter of the second guide hole is the same as the inner diameter of the discharge end of the first guide hole.

[0020] Furthermore, the first mold hole is located in the middle of the first mold body and is evenly arranged along the length direction of the first mold body.

[0021] The second mold hole is located in the middle of the second mold body and is evenly arranged along the length of the second mold body.

[0022] Furthermore, the feed end of the second die body is provided with a serrated structure along its length, and an air inlet is provided on the side wall of the second die body; when the second die body is connected to the first die body, the serrated structure forms a second gap.

[0023] Furthermore, the discharge end of the first die is provided with a first protrusion, and the feed end of the second die is provided with a first groove, wherein the first protrusion and the first groove form a snap-fit ​​connection.

[0024] Furthermore, the first protrusion has second grooves at both ends along the width direction; the sidewall of the first groove forms a second protrusion, and the second protrusion and the second groove are engaged.

[0025] According to another aspect of this application, an extruder is also provided, including the die as described in any of the preceding claims, and further including a die head, the die being detachably connected to the die head.

[0026] In this embodiment, a first gap is formed between the positioning guide tube and the second die hole. The first die body is detachably connected to the extruder head; the second die body is detachably connected to the first die body; the first die body has a first die hole; the second die body has a second die hole; the discharge end of the first die hole is connected to the feed end of the second die hole; a positioning guide tube is installed in the first die hole or the second die hole, and the outer diameter of the discharge end of the positioning guide tube is smaller than the inner diameter of the discharge end of the second die hole, so that a first gap is formed between the positioning guide tube and the second die hole. This achieves the purpose of cooling or blowing away the fiber film through the first gap, thereby improving the technical effect of finished product quality. This solves the technical problem that the nylon-glass fiber melt cannot be effectively cooled due to the straight-through structure of the die, and the fiber film attached to the surface of the nylon-glass fiber melt cannot be removed, which easily leads to the fiber film adhering to the surface of the formed particles or surface defects, affecting the final product quality. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0028] Figure 1 This is a structural schematic diagram of the mold assembly state according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the mold assembly state according to an embodiment of this application;

[0030] Figure 3 This is an exploded view of the die according to an embodiment of this application;

[0031] Figure 4 This is an exploded structural diagram of the die according to an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the internal structure of the first circular tube and the second circular tube according to an embodiment of this application;

[0033] Figure 6 This is a cross-sectional schematic diagram of the die assembly state according to an embodiment of this application;

[0034] Figure 7 This is a schematic diagram showing the state of the first round tube and the second round tube installed on the second die body according to an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the structure of the first die according to an embodiment of this application;

[0036] Figure 9 This is a schematic diagram of the structure of the fourth positioning guide tube on the left side hidden in the mold assembly state according to an embodiment of this application;

[0037] Figure 10 According to the embodiments of this application Figure 9 A magnified view of part A in the diagram.

[0038] Figure Labels

[0039] 1. First die body; 2. Second die body; 3. First die hole; 4. Second die hole; 5. Pin hole; 6. Main channel; 7. Waist-shaped groove; 8. Guide surface; 9. Positioning guide tube; 10. Annular inner step; 11. Serrated structure; 12. Air inlet; 13. Annular limiting protrusion; 14. First round tube; 15. Second round tube; 16. First guide hole; 17. Second guide hole; 18. First protrusion; 19. First groove; 20. Second groove; 21. Second protrusion; 22. First gap. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0043] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0044] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figure 1-10As shown, this application relates to a die, which includes: a first die body 1, detachably connected to the extruder head; and a second die body 2, detachably connected to the first die body 1. Specifically, bolt holes are respectively provided on both sides of the first die body 1 and the second die body 2 in the width direction for fixed connection between the two; and pin holes 5 are provided at intervals from the bolt holes for connecting the first die body 1 and the second die body 2 to the extruder head.

[0047] The first die body 1 is provided with a first die hole 3; the second die body 2 is provided with a second die hole 4; the discharge end of the first die hole 3 is connected to the feed end of the second die hole 4; the diameter of the first die hole 3 is larger than that of the second die hole 4, wherein the first die hole 3 and the second die hole 4 are used to install a positioning guide tube 9, the positioning guide tube 9 is inserted into the first die hole 3 and is detachably installed in the first die hole 3 or the second die hole 4; the outer diameter of the discharge end of the positioning guide tube 9 is smaller than the inner diameter of the discharge end of the second die hole 4, so that a first gap 22 is formed between the positioning guide tube 9 and the second die hole 4, the first gap 22 is an annular gap, so that air can be blown out from the first gap 22, which on the one hand cools the nylon and glass fiber melt extruded by the positioning guide tube 9, and on the other hand blows away the fuzzy fiber film formed on the surface of the nylon and glass fiber melt.

[0048] The positioning guide tube 9 includes a first circular tube 14 and a second circular tube 15 connected sequentially along the material conveying direction. The first circular tube 14 and the second circular tube 15 are integrally formed. For example, in this embodiment, the outer diameter of the first circular tube 14 is 13 mm, the inner diameter is 9 mm, and the length is 16 mm; the outer diameter of the second circular tube 15 is 11 mm, the inner diameter is 4 mm, the length of the second circular tube 15 is 8 mm, and the thickness of the inclined surface is 2 mm.

[0049] An annular limiting protrusion 13 is provided on the outer circumferential surface at the connection between the first circular tube 14 and the second circular tube 15; an annular inner step 10 is embedded in the first mold hole 3 to form a limiting shoulder, which is used to prevent the positioning guide tube 9 inserted into the first mold hole 3 from axially slipping out; the annular limiting protrusion 13 matches the annular inner step 10, so that the positioning guide tube 9 can be locked on the annular inner step 10, thereby realizing the axial positioning of the guide tube and preventing it from falling off.

[0050] The positioning guide tube 9 has a first guide hole 16 and a second guide hole 17 connected in sequence in the middle. The inner diameter of the first guide hole 16 gradually decreases along the melt flow direction to guide the melt to gradually converge. The second guide hole 17 is a straight hole, and the inner diameter of the second guide hole 17 is the same as the inner diameter of the discharge end of the first guide hole 16. This facilitates the connection between the first guide hole 16 and the second guide hole 17 and also allows for precise control of the cross-sectional dimensions of the outflowing material.

[0051] Preferably, a through waist-shaped groove 7 is provided in the middle of the feed end of the first die body 1 along the length direction. The bottom and sidewalls of the through waist-shaped groove 7 are formed by arc transition to form a flow guiding surface 8. The flow guiding surface 8 is used to guide the nylon and glass fiber melt.

[0052] The bottom of the guide surface 8 is provided with a main channel 6, which is inclined and connected to the positioning guide tube 9. The inclined main channel 6 can make the nylon and glass fiber melt flow more smoothly to the positioning guide tube 9, avoiding the local pressure increase and melt retention caused by right angle turn, which is conducive to improving extrusion efficiency and product quality.

[0053] The main channel 6 is a straight channel with a rounded end to reduce melt flow resistance; the feed end of the first die hole 3 matches the rounded end of the main channel 6.

[0054] Preferably, the first mold hole 3 is located in the middle of the first die body 1 and is evenly arranged along the length direction of the first die body 1; the second mold hole 4 is located in the middle of the second die body 2 and is evenly arranged along the length direction of the second die body 2, and the second mold hole 4 corresponds to the first mold hole 3; the number of the first mold hole 3 and the second mold hole 4 can be set according to actual needs.

[0055] Preferably, the outer side wall of the first die body 1 is provided with reinforcing ribs evenly distributed along the longitudinal direction to improve the overall rigidity of the die and reduce thermal deformation.

[0056] Preferably, the feed end of the second die body 2 is provided with a serrated structure 11 along its length, and an air inlet 12 is provided on the side wall of the second die body 2; when the second die body 2 is connected to the first die body 1, the serrated structure 11 and the corresponding surface of the second die body 2 form a second gap for gas flow; when the air inlet 12 is connected to an air source, compressed air enters from the air inlet 12 and is blown through the second gap to the first gap 22 to assist in cooling the extruded melt and blow away the fiber film attached to the surface.

[0057] After being extruded from the discharge port of the extruder head, the nylon-glass fiber reinforced melt sequentially enters the first guide hole 16 and the second guide hole 17, and is extruded from the second guide hole 17. When compressed air is input from the air inlet 12, the air passes through the second gap and the first gap 22, and acts on the nylon-glass fiber reinforced melt extruded from the middle hole. On the one hand, it can cool the melt and help the melt to set; on the other hand, it can effectively blow away the fiber film attached to the surface of the melt, ensuring that the surface of the extruded strip material is smooth, preparing for subsequent pelletizing, and improving the surface quality and consistency of the finished pellets.

[0058] Preferably, the discharge ends of the first die body 1 and the second die body 2 are inclined downwards and have discharge ramps. The inlet end of the ramp is connected to the arc transition part of the straight channel to smoothly guide the melt to flow out evenly and avoid local shearing or material accumulation.

[0059] The first die has a first protrusion 18 at the discharge end and a first groove 19 at the feed end of the second die. The first protrusion 18 and the first groove 19 are engaged. The first protrusion 18 is inserted into the first groove 19 to form a preliminary engagement. The two ends of the first protrusion 18 are provided with second grooves 20 along the width direction. The sidewall of the first groove 19 forms a second protrusion 21. The second protrusion 21 and the second groove 20 are engaged. The second protrusion 21 is inserted into the second groove 20 to form a secondary engagement to prevent lateral shaking. The multi-engagement structure can form a tighter contact surface, which helps to improve the sealing effect at the interface and reduce the risk of nylon and glass fiber melt leaking from the connection gap.

[0060] From the above description, this application uses a method in which a first gap 22 is formed between the positioning guide tube 9 and the second die hole 4, and the first die body 1 is detachably connected to the extruder head; the second die body 2 is detachably connected to the first die body 1; the first die body 1 is provided with a first die hole 3; the second die body 2 is provided with a second die hole 4; the discharge end of the first die hole 3 is connected to the feed end of the second die hole 4; a positioning guide tube 9 is installed in the first die hole 3 or the second die hole 4, and the discharge end of the positioning guide tube 9... The outer diameter of the die is smaller than the inner diameter of the discharge end of the second die hole 4, so that a first gap 22 is formed between the positioning guide tube 9 and the second die hole 4. This achieves the purpose of cooling or blowing away the fiber film through the first gap 22, thereby improving the technical effect of finished product quality. This solves the technical problem that the nylon-glass fiber melt cannot be effectively cooled due to the straight-through structure of the die, and the fiber film attached to the surface of the nylon-glass fiber melt cannot be removed. This can easily lead to the fiber film adhering to the surface of the formed particles or surface defects, affecting the final product quality.

[0061] This application also provides an extruder including the die as described in any of the above claims, and a die head, wherein the die is detachably connected to the die head.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A mouth mold, characterized in that, include: The first die body (1) is detachably connected to the extruder head; The second die body (2) is detachably connected to the first die body (1); The first die body (1) is provided with a first die hole (3); The second die body (2) is provided with a second die hole (4); The discharge end of the first mold hole (3) is connected to the feed end of the second mold hole (4); A positioning guide tube (9) is installed in the first mold hole (3) or the second mold hole (4). The outer diameter of the discharge end of the positioning guide tube (9) is smaller than the inner diameter of the discharge end of the second mold hole (4), so that a first gap (22) is formed between the positioning guide tube (9) and the second mold hole (4).

2. The die according to claim 1, characterized in that, The first die body (1) has a through waist-shaped groove (7) in the middle of the feed end along the length direction. The bottom and sidewalls of the through waist-shaped groove (7) are formed by arc transition to form a guide surface (8). The bottom of the guide surface (8) is provided with a main channel (6), which is inclined and connected to the positioning guide pipe (9).

3. The die according to claim 1, characterized in that, The positioning guide pipe (9) includes a first circular pipe (14) and a second circular pipe (15) connected sequentially along the material conveying direction.

4. The die according to claim 3, characterized in that, An annular limiting protrusion (13) is provided on the outer circumferential surface at the connection between the first round tube (14) and the second round tube (15); The first mold hole (3) is provided with an annular inner step (10); The annular limiting protrusion (13) matches the annular inner step (10).

5. The die according to claim 1, characterized in that, The positioning guide tube (9) has a first guide hole (16) and a second guide hole (17) connected in sequence in the middle. The inner diameter of the first guide hole (16) gradually decreases along the material flow direction. The second guide hole (17) is a straight hole, and the inner diameter of the second guide hole (17) is the same as the inner diameter of the discharge end of the first guide hole (16).

6. The die according to claim 1, characterized in that, The first mold hole (3) is located in the middle of the first die body (1) and is evenly arranged along the length direction of the first die body (1); The second mold hole (4) is located in the middle of the second mold body (2) and is evenly arranged along the length direction of the second mold body (2).

7. The die according to claim 1, characterized in that, The feed end of the second die body (2) is provided with a serrated structure (11) along the length direction, and an air inlet (12) is provided on the side wall of the second die body (2); when the second die body (2) is connected to the first die body (1), the serrated structure (11) forms a second gap.

8. The die according to claim 6, characterized in that, The first die has a first protrusion (18) at the discharge end and a first groove (19) at the feed end of the second die. The first protrusion (18) and the first groove (19) are engaged.

9. The die according to claim 8, characterized in that, The first protrusion (18) has a second groove (20) at both ends along the width direction; the sidewall of the first groove (19) forms a second protrusion (21), and the second protrusion (21) and the second groove (20) are engaged.

10. An extruder, characterized in that, The die includes any one of claims 1-9, and further includes a machine head, wherein the die is detachably connected to the machine head.

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