Drying-free head

Abstract

The utility model relates to a drying-free head which comprises an inner core, an outer cylinder and an end cover. A through cavity is formed in the outer cylinder in the axial direction in a penetrating mode. The two end covers are respectively fixed at two axial ends of the outer cylinder, the inner core is arranged in the outer cylinder and is blocked and limited by the two end covers, a glue passing hole is formed in the center of each end cover, a glue passing cavity communicated with the glue passing hole is formed between the outer wall of the inner core and the inner wall of the outer cylinder, and an exhaust hole communicated with the glue passing cavity is formed in the cylinder wall of the outer cylinder. The drying-free head has the advantages of being simple in structure, convenient to assemble, good in exhaust effect and the like.

Description

Technical Field

[0001] The utility model relates to a drying-free head and belongs to the field of injection molding design. Background Art

[0002] When the injection molding machine is working, plastic material is added into the barrel, and the plastic material is molten through the rotation of the screw in the barrel and the heating of the barrel. Then the rotation of the screw drives the plastic material forward, so that the plastic is ejected from the nozzle at the end of the barrel with great pressure and speed, and injected into the closed mold. After pressure maintenance and cooling, it solidifies into the required plastic product. During the working process, the plastic material undergoes a process of melting, compression and decompression in the barrel. The water and volatile substances in the molten plastic material will gasify. If the gasified water vapor and volatile substances cannot be discharged, it will affect the quality of the injection molded product. Utility Model Content

[0003] The utility model provides a drying-free head which has a simple structure and is convenient to assemble.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a drying-free head, comprising an inner core, an outer cylinder and an end cover;

[0006] A through cavity is provided in the outer cylinder along its axial direction;

[0007] The two end covers are respectively fixed at the axial ends of the outer tube, the inner core is installed in the outer tube and is restrained and limited by the two end covers, a glue hole is arranged at the center of the end cover, a glue cavity connected with the glue hole is formed between the outer wall of the inner core and the inner wall of the outer tube, and an exhaust hole connected with the glue cavity is arranged on the wall of the outer tube.

[0008] In some embodiments, the through cavity is a cylindrical cavity structure, and correspondingly, the inner core is a cylindrical structure.

[0009] In some embodiments, a positioning member is further included. The outer cylinder is provided with a positioning hole for the positioning member to pass through. The positioning member passes through the positioning hole and is fixedly connected to the inner core to limit the inner core from rotating relative to the outer cylinder.

[0010] In some embodiments, the positioning member is a positioning pin, one end of which is provided with an external threaded portion, and a screw hole is provided on the inner core at a position corresponding to the positioning hole, and the external threaded portion is inserted into the positioning hole and then screwed into the screw hole.

[0011] In some embodiments, the exhaust hole also serves as the positioning hole.

[0012] In some embodiments, the exhaust hole is a strip-shaped hole extending along the axial direction.

[0013] In some embodiments, a concave portion is formed on the outer wall of the inner core at the glue cavity.

[0014] In some embodiments, the glue-passing cavity and the exhaust hole are staggered, and an airway is provided between the glue-passing cavity and the exhaust hole; the gap between the inner circumference of the outer cylinder and the outer circumference of the inner core serves as the airway, and the gap tolerance is not greater than 0.1 mm.

[0015] In some embodiments, the end cover is screwed to the end of the outer cylinder by threads; a joint portion protruding axially outward is provided at the center of the outer end of the end cover, and the glue hole passes through the joint portion.

[0016] In some embodiments, the exhaust hole is arranged opposite to the glue-passing cavity, and the inner port diameter of the exhaust hole is no more than 1 mm.

[0017] The drying-free head provided by the utility model is installed on the injection molding barrel assembly for use, has the function of exhausting and dehumidifying, has a simple and reasonable structure, is easy to assemble, and can improve the production quality of injection molding parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a front view of the drying-free head in the utility model;

[0020] Figure 2 For along Figure 1 Sectional view cut along line AA;

[0021] Figure 3 For along Figure 1 Sectional view cut along the midline BB;

[0022] Figure 4 This is an exploded view of the drying head in the present invention.

[0023] Reference numerals shown in the figure: 1-inner core; 11-rubber cavity; 12-recessed portion; 2-outer cylinder;

[0024] 21-through cavity; 22-exhaust hole; 23-positioning hole; 3-end cover; 31-glue hole; 32-connector; 4-positioning piece; 5-airway. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present utility model are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In the present utility model, unless otherwise clearly specified and limited, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] like Figures 1 to 4 As shown, the utility model provides a drying-free head, which is installed on the plastic injection barrel assembly for use, and is used to discharge the material during material transportation, so as to achieve the purpose of drying-free material. It includes an inner core 1, an outer barrel 2 and an end cover 3; a through cavity 21 is provided in the outer barrel 2 along its axial direction; two end covers 3 are respectively fixed at the axial ends of the outer barrel 2, the inner core 1 is installed in the outer barrel 2 and is restrained and limited by the two end covers 3, that is, the inner core 1 is axially limited by the two end covers 3, a glue hole 31 is provided at the center of the end cover 3, a glue cavity 11 connected to the glue hole 31 is formed between the outer wall of the inner core 1 and the inner wall of the outer barrel 2, and an exhaust hole 22 connected to the glue cavity 11 is provided on the barrel wall of the outer barrel 2. The structure of the drying-free head in this embodiment is reasonably set up, and a split assembly structure is adopted, which is convenient for assembly and production. When installed and used, the material in the plastic cylinder enters the drying-free head and is transported through the glue cavity 11 located at the connection between the inner core 1 and the outer cylinder 2, so that the gas in the material is discharged through the exhaust hole 22 during the transportation process.

[0029] like Figure 3 and Figure 4 As shown, the through cavity 21 is a cylindrical cavity structure, and correspondingly, the inner core 1 is a cylindrical structure; in order to prevent the inner core 1 from rotating relative to the outer cylinder 2 after the inner core 1 is installed therein, a positioning member 4 is provided for circumferential limiting, and a positioning hole 23 for the positioning member 4 to pass through is provided on the outer cylinder 2. The positioning member 4 is inserted into the positioning hole 23 and is fixedly connected to the inner core 1 to limit the rotation of the inner core 1 relative to the outer cylinder 2.

[0030] Exemplarily, the positioning member 4 is a positioning pin, one end of which is provided with an external threaded portion, and a screw hole is provided on the inner core 1 at a position corresponding to the positioning hole 23. The external threaded portion is inserted into the positioning hole 23 and then screwed into the screw hole, thereby achieving circumferential positioning between the inner core 1 and the outer tube 2.

[0031] In order to simplify the structure, in this embodiment, the exhaust hole 22 is provided to also serve as the positioning hole 23 , so that there is no need to specially provide a positioning hole 23 to penetrate the positioning member 4 .

[0032] The exhaust hole 22 is a strip hole extending in the axial direction, and the strip hole has a larger exhaust port, which is conducive to gas discharge.

[0033] In some embodiments, Figure 4 As shown, a concave recess 12 is formed on the outer wall of the inner core 1 at the glue passage cavity 11. After the inner core 1 is loaded into the outer tube 2, the recess 12 and the inner wall of the outer tube 2 at the corresponding position are combined to form the glue passage cavity 11. A cavity is provided on the inner core 1 to connect the glue passage hole 31 with the glue passage cavity 11, so as to facilitate material transportation. In actual operation, a plurality of glue passage cavities 11 (such as three, four or five) can be provided along the circumferential direction.

[0034] In some embodiments, Figure 4 As shown, the glue-passing cavity 11 and the exhaust hole 22 are staggered, and an airway 5 is provided between the glue-passing cavity 11 and the exhaust hole 22; the gap between the inner circumference of the outer tube 2 and the outer circumference of the inner core 1 serves as the airway 5, and the gap tolerance is not greater than 0.1 mm, so that the gas emitted when the material in the glue-passing cavity 11 passes through the airway 5 enters the exhaust hole 22 and is discharged to the outside, and the gap tolerance is set to be no greater than 0.1 mm, and the gap is controlled within a reduced range to prevent a large amount of material from overflowing while exhausting.

[0035] In some embodiments, see Figure 2 and Figure 4As shown, in order to facilitate the assembly between the end cover 3 and the outer tube 2, the end cover 3 is screwed to the end of the outer tube 2 through a thread in this embodiment; and in order to facilitate the connection between the end head 3 and the external component, a joint part 32 protruding outward along the axial direction is provided at the center of the outer end of the end cover 3, the glue hole 31 passes through the joint part 32, and an external thread is provided on the outside of the joint part 32. During installation, the joint part 32 is connected to the docking component in a threaded connection manner.

[0036] As an alternative to the above embodiment, the exhaust hole 22 can also be arranged to face the glue-passing cavity 11, and the inner port diameter of the exhaust hole 22 can be set to be no more than 1 mm. Specifically, the inner port diameter of the exhaust hole 22 can be set to 0.4 mm, 0.6 mm, 0.8 mm and 1 mm, etc., so that the gas emitted when the material passes through the glue-passing cavity 11 can be directly discharged through the exhaust hole 22. Since the inner port diameter of the exhaust hole 22 is set to be less than 1 mm, it is possible to minimize material overflow while ensuring the exhaust effect.

[0037] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A drying-free head, characterized in that: It comprises an inner core (1), an outer cylinder (2) and an end cover (3); A through cavity (21) is provided in the outer cylinder (2) along its axial direction; The two end covers (3) are respectively fixed at the axial ends of the outer cylinder (2); the inner core (1) is mounted on the outer cylinder (2) and is restrained by the two end covers (3); a glue hole (31) is arranged at the center of the end cover (3); a glue cavity (11) connected to the glue hole (31) is formed between the outer wall of the inner core (1) and the inner wall of the outer cylinder (2); and an exhaust hole (22) connected to the glue cavity (11) is arranged on the cylinder wall of the outer cylinder (2).

2. The drying-free head according to claim 1, characterized in that: The through cavity (21) is a cylindrical cavity structure, and correspondingly, the inner core (1) is a cylindrical structure.

3. The drying-free head according to claim 2, characterized in that: It also comprises a positioning member (4), the outer cylinder (2) is provided with a positioning hole (23) for the positioning member (4) to pass through, the positioning member (4) passes through the positioning hole (23) and is fixedly connected to the inner core (1) to limit the inner core (1) from rotating relative to the outer cylinder (2).

4. The drying-free head according to claim 3, characterized in that: The positioning member (4) is a positioning pin, one end of which is provided with an external threaded portion, and a screw hole is provided on the inner core (1) at a position corresponding to the positioning hole (23), and the external threaded portion is inserted into the positioning hole (23) and then screwed into the screw hole.

5. The drying-free head according to claim 3 or 4, characterized in that: The exhaust hole (22) also serves as the positioning hole (23).

6. The drying-free head according to claim 1, characterized in that: The exhaust hole (22) is a strip-shaped hole extending along the axial direction.

7. The drying-free head according to claim 1, characterized in that: An inwardly concave recess (12) is formed on the outer wall of the inner core (1) at the glue passage cavity (11).

8. The drying-free head according to claim 1, characterized in that: The glue-through cavity (11) and the exhaust hole (22) are arranged in a staggered manner, and an air passage (5) is provided between the glue-through cavity (11) and the exhaust hole (22); the gap between the inner circumference of the outer cylinder (2) and the outer circumference of the inner core (1) serves as the air passage (5), and the gap tolerance is not greater than 0.1 mm.

9. The drying-free head according to claim 1, characterized in that: The end cover (3) is screwed to the end of the outer cylinder (2) via a thread; a joint portion (32) protruding outward along the axial direction is provided at the center of the outer end of the end cover (3), and the glue hole (31) passes through the joint portion (32).

10. The drying-free head according to claim 1, characterized in that: The exhaust hole (22) is arranged opposite to the glue-passing cavity (11), and the inner port diameter of the exhaust hole (22) is not greater than 1 mm.

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