CN219191161U

CN219191161U - Feeding screw and screw barrel assembly

Info

Publication number: CN219191161U
Application number: CN202320313924.1U
Authority: CN
Inventors: 朱立述; 朱瑞东
Original assignee: Wenzhou Jingwei Mechanical Equipment Technology Co ltd
Current assignee: Wenzhou Jingwei Mechanical Equipment Technology Co ltd
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-06-16
Anticipated expiration: 2033-02-13

Abstract

The utility model discloses a feeding screw and a screw barrel assembly, wherein the feeding screw comprises a screw body, an inner glue feeding section and an outer glue feeding section are arranged at the front part of the screw body, a material passing channel is arranged in the inner glue feeding section, a sealing ring part is arranged at the periphery of the rear end of the inner glue feeding section, and a feeding port of the material passing channel is arranged at the rear side of the sealing ring part; a spiral feeding groove and a spiral air guide groove are formed in the peripheral wall of the outer glue feeding section, a discharge hole of the material passing channel is formed in the rear end of the spiral feeding groove, the spiral feeding groove is adjacent to the spiral air guide groove, a spiral convex edge is formed between the spiral feeding groove and the spiral air guide groove, and an air passing structure for communicating the spiral feeding groove and the spiral air guide groove is arranged on the spiral convex edge; the peripheral wall of the inner glue-moving section is provided with a gas guide cavity, the front end of the gas guide cavity is communicated with the rear end of the spiral gas guide groove, and the rear end extends towards the sealing ring part. The utility model has reasonable structural design, prevents glue materials from overflowing outwards at the exhaust port on the material cylinder, and can effectively facilitate the gas in the materials to be discharged out of the material cylinder, thereby enhancing the exhaust capacity and improving the injection molding production quality.

Description

Feeding screw and screw barrel assembly

Technical Field

The utility model relates to a feeding screw and screw barrel assembly, and belongs to the field of structural design of injection molding machines.

Background

The screw injection molding machine is widely used, granular or powdery plastic is added into a charging barrel from a charging opening during operation, the material is melted into colloid through the rotation of a feeding screw in the charging barrel and the heating of the outer wall of the charging barrel, and finally the plasticized colloid material is ejected from a nozzle under high pressure by the thrust of the feeding screw.

Patent document CN212920300U discloses an exhaust type screw injection molding machine comprising a barrel and a screw provided in the barrel, the screw comprising in order: the device comprises a feeding section, a compression section, a metering section and an elongated exhaust section, wherein the elongated exhaust section sequentially comprises a second feeding section, a second compression section and a second metering section; the machine barrel is provided with a feeding port corresponding to the feeding section and an exhaust port corresponding to the second feeding section. In the process of conveying materials by pushing a screw, the moisture and volatile substances in the materials are gasified and discharged through an exhaust port, so that the moisture in the materials is reduced, and the problems in actual production are as follows: due to the existence of the exhaust port, the glue stock is difficult to avoid blocking at the exhaust port in the process of conveying the glue stock forwards along the outer surface of the feeding screw, so that the problem of flash occurs, and when the flash is more, the exhaust port is blocked, so that the normal exhaust is influenced, and the injection molding production quality is influenced.

Disclosure of Invention

Aiming at the defects pointed out in the background art, the utility model aims to provide the feeding screw rod with reasonable structural optimization and the screw rod charging barrel assembly using the same, and the overflow can be prevented, the exhaust effect is ensured and the injection molding production quality is improved through structural optimization.

The technical scheme for realizing the aim of the utility model is as follows:

the utility model relates to a feeding screw, which comprises a screw body, wherein an inner rubber conveying section and an outer rubber conveying section connected to the front end of the inner rubber conveying section are arranged at the front part of the screw body, a material passing channel for passing rubber materials is arranged in the inner rubber conveying section, a sealing ring part is arranged at the periphery of the rear end of the inner rubber conveying section, and a feeding port of the material passing channel is arranged at the rear side of the sealing ring part;

the outer peripheral wall of the outer glue feeding section is provided with a spiral feeding groove and a spiral air guide groove, a discharge hole of the material passing channel is arranged at the inner rear end of the spiral feeding groove, the spiral feeding groove is adjacent to the spiral air guide groove, a spiral convex edge is formed between the spiral feeding groove and the spiral air guide groove, and the spiral convex edge is provided with an air passing structure for communicating the spiral feeding groove with the spiral air guide groove;

the outer peripheral wall of the inner glue feeding section is provided with a gas guide cavity, the front end of the gas guide cavity is communicated with the rear end of the spiral gas guide groove, and the rear end extends towards the sealing ring part.

In a further technical scheme of the utility model, the outer glue feeding section comprises a compression section, the depth of a spiral feeding groove on the compression section is gradually reduced in the back-to-front direction, and at least one section of the spiral air guide groove is arranged on the compression section.

In a further technical scheme of the utility model, the rear end of the air guide cavity extends to be connected with the sealing ring part.

In a further technical scheme of the utility model, the material passing channel comprises an axial cavity channel which is arranged in the center of the inner glue running section and extends along the axial direction of the inner glue running section, and the material inlet and the material outlet which are respectively communicated with two ends of the axial cavity channel.

In a further technical scheme of the utility model, the screw body is formed by butt joint of at least two sections of rod bodies.

In a further technical scheme of the utility model, the front end of the spiral air guide groove is arranged in a closed mode.

In a further technical scheme of the utility model, the air guide cavity is of a spiral groove structure.

In a further technical scheme of the utility model, the gas passing structure is a concave formed by concave on the peripheral surface of the spiral rib, and the depth of the concave is not more than 0.2mm.

The screw rod charging barrel assembly comprises a charging barrel and a feeding screw rod arranged in the charging barrel, wherein the feeding screw rod is adopted, and an exhaust port is arranged on the side wall of the charging barrel and corresponds to the rear end of the air guide cavity.

The utility model has the positive effects that: according to the utility model, through the optimized design of the structure of the feeding screw, during installation and use, the sizing material is conveyed forwards through the internal sizing passage instead of being conveyed from the surface of the screw, so that the sizing material bypasses the exhaust port on the side wall of the charging barrel, and the gas emitted by the sizing material in the extrusion conveying process in the spiral feeding groove enters the spiral air guide groove through the air passage structure, flows backwards through the air guide cavity and is finally discharged through the exhaust port on the charging barrel, thereby avoiding the sizing material from overflowing at the exhaust port, ensuring the exhaust effect and guaranteeing the injection molding production quality.

Drawings

These and/or other aspects, features and advantages of the present disclosure will become more apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic view of a feed screw according to the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a partial enlarged view at B in FIG. 2;

FIG. 4 is a schematic view of the structure of the front section of the feed screw shown in FIG. 1;

FIG. 5 is a front view of the front section of the feed screw of the present utility model;

FIG. 6 is a schematic view of the structure of the front section of another feed screw;

fig. 7 is a cross-sectional view of a cartridge of the present utility model.

The reference numerals shown in the figures are: 1-an inner glue feeding section; 11-a material passing channel; 110-a feed inlet; 111-a discharge hole; 12-a seal ring portion; 13-an air guide cavity; 2-an outer glue feeding section; 21-a spiral feed chute; 22-a spiral air guide groove; 23-spiral rib; 231-recessing; 3-threaded posts; 4-a threaded hole; 5-a charging barrel; 51-exhaust port; 52-feed inlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model.

Example 1 feed screw

In this embodiment, referring to the direction in fig. 1, that is, the feeding screw is upward, that is, downward, that is, the feeding screw is a feeding screw, as shown in fig. 1 to 5, and includes a screw body, an inner glue feeding section 1 and an outer glue feeding section 2 connected to the front end of the inner glue feeding section 1 are provided at the front part of the screw body, a material passing channel 11 through which glue passes is provided inside the inner glue feeding section 1, a sealing ring part 12 is provided at the periphery of the rear end of the inner glue feeding section 1, and a feeding port 110 of the material passing channel 11 is provided at the rear side of the sealing ring part 12; a spiral feeding groove 21 and a spiral air guide groove 22 are formed in the peripheral wall of the outer glue feeding section 2, a discharge hole 111 of the passing channel 11 is formed in the rear end of the spiral feeding groove 21, the feeding screw is arranged in the charging barrel when the feeding screw is installed and used, the feeding screw is driven by an external driving mechanism to drive a material to be conveyed forwards in the charging barrel 5, the material is heated and gradually melted to form glue materials in the forward conveying process of the rear end under the driving of the feeding screw, the glue materials enter the passing channel 11 from the feed hole 110 when conveyed to the inner glue feeding section 1, finally the glue materials are extruded from the discharge hole 111 (the feed hole 110 is positioned at the rear end of the inner glue feeding section 1, the discharge hole 111 is positioned at the front end of the inner glue feeding section 1), the glue materials are continuously conveyed forwards through the spiral feeding groove 21 of the outer glue feeding section 2, a spiral convex edge 23 is formed between the spiral conveying groove 21 and the spiral air guide groove 22, and the spiral convex edge 23 is provided with an air passing structure for communicating the spiral feeding groove 21 and the spiral air guide groove 22; the peripheral wall of the inner glue feeding section 1 is provided with an air guide cavity 13, the front end of the air guide cavity 13 is communicated with the rear end of the spiral air guide groove 22, and the rear end of the air guide cavity 13 extends towards the sealing ring part 12; in the process of forward conveying of the sizing material in the spiral feeding groove 21, gas in the sizing material is dispersed and enters the spiral air guide groove 22 from the gas passing structure and flows backward to the air guide cavity 13, and finally is discharged from the air outlet 51 on the charging barrel 5, so that a good air discharging effect is achieved.

In this embodiment, the front end of the spiral air guide groove 22 is provided in a closed manner, so that the glue stock is prevented from entering the spiral air guide groove 22 from the front end, flash is avoided, and the glue stock is prevented from entering the spiral air guide groove 22 to affect the exhaust effect.

As a preferred solution, for convenience of processing, the air guiding cavity 13 in this embodiment adopts a spiral groove structure, and the rotation direction of the spiral groove structure may be the same as the rotation direction of the spiral air guiding groove 22, as shown in fig. 1 to 5; in practical implementation, the spiral direction of the spiral groove structure may be opposite to that of the spiral air guide groove 22, as shown in fig. 6.

For convenience in processing, the air passing structure in this embodiment is a recess 231 formed by concave inward on the outer peripheral surface of the spiral rib 23, the depth of the recess 231 is not greater than 0.2mm, specifically, the depth of the recess 231 can be set to be 0.15mm, 0.12mm, 0.1mm or 0.05mm, preferably, the depth of the recess 231 is not greater than 0.1mm, in practical use, due to the shallower depth of the recess 231, the glue material can be prevented or reduced from entering the spiral air guide groove 22 through the recess 231 when conveyed in the spiral feeding groove 22 as much as possible, and the air can pass through.

In a further embodiment, the outer rubber-feeding section 2 comprises a compression section, the depth of a spiral feeding groove 21 on the compression section is gradually reduced in the backward and forward direction, at least one section of the spiral air guide groove 22 is arranged on the compression section, and the arrangement is that the rubber material can be further compressed in the forward conveying process in the compression section, so that the gas in the rubber material can be more fully extruded, and the extruded gas can enter the spiral air guide groove 22 through the gas passing structure in the embodiment and flow backwards, so that the exhaust effect is improved, and the plasticizing effect of the rubber material is better ensured.

In this embodiment, the rear end of the air guiding cavity 13 extends to be connected with the sealing ring portion 12, so as to better guide the exhaust. In this embodiment, for convenience in processing, the material passing channel 11 includes an axial channel disposed at the center of the inner glue running section 1 and extending along the axial direction thereof, and the feeding port 110 and the discharging port 111 respectively connected to two ends of the axial channel, where the axial channel, the feeding port 110 and the discharging port 111 may be obtained by drilling; further to facilitate the entry of material from the feed opening 110 into the feed channel 11, the feed opening 110 may be provided as a sloping hole.

In this embodiment, the screw body is designed to be formed by butt joint of two sections of rod bodies, the two connected sections of rod bodies are connected by screw connection of a threaded column 3 and a threaded hole 4, the specific structure can be seen in fig. 3 and 4, and in actual operation, the screw body can also be formed by butt joint of three sections or four sections of rod bodies.

The feeding screw in this embodiment makes the sizing material can be carried through the internal sizing passage 11 and not from the screw surface through the internal sizing section 1 when installing and using, can make the sizing material bypass the gas vent on the feed cylinder lateral wall like this, and the gas that the sizing material sent out in the extrusion transportation process in spiral chute 21 gets into spiral air guide 22 through the gas passing structure, and then flow backward through air guide cavity 13, finally discharge through gas vent 51 on the feed cylinder 5, can avoid sizing material to take place the flash in gas vent 51 department like this, guarantee the exhaust effect simultaneously, guarantee injection molding production quality.

Example 2 screw barrel Assembly

The screw barrel assembly in this embodiment comprises a barrel 5 and a feeding screw rod arranged in the barrel 5, wherein the feeding screw rod in embodiment 1 is adopted, an exhaust port 51 is arranged on the side wall of the barrel 5 and corresponds to the rear end of the air guide cavity 13, a feed inlet 52 is arranged on the side wall of the rear end of the barrel 5, and materials are injected into the barrel 5 from the feed inlet 52, as shown in fig. 7, which is a sectional view of the barrel in this embodiment.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While those obvious variations or modifications which come within the spirit of the utility model remain within the scope of the utility model.

Claims

1. The feeding screw comprises a screw body, wherein an inner glue feeding section (1) and an outer glue feeding section (2) connected to the front end of the inner glue feeding section (1) are arranged at the front part of the screw body, a material passing channel (11) for glue passing is arranged in the inner glue feeding section (1), a sealing ring part (12) is arranged at the periphery of the rear end of the inner glue feeding section (1), and a feeding port (110) of the material passing channel (11) is arranged at the rear side of the sealing ring part (12);

the automatic glue feeding device is characterized in that a spiral feeding groove (21) and a spiral air guide groove (22) are formed in the peripheral wall of the outer glue feeding section (2), a discharge hole (111) of the material passing channel (11) is formed in the rear end of the spiral feeding groove (21), the spiral feeding groove (21) is adjacent to the spiral air guide groove (22) and a spiral convex rib (23) is formed between the spiral feeding groove and the spiral air guide groove, and an air passing structure which is used for communicating the spiral feeding groove (21) and the spiral air guide groove (22) is arranged on the spiral convex rib (23);

the inner glue feeding section (1) is characterized in that an air guide cavity (13) is arranged on the peripheral wall of the inner glue feeding section (1), the front end of the air guide cavity (13) is communicated with the rear end of the spiral air guide groove (22), and the rear end of the air guide cavity (13) extends towards the sealing ring part (12).

2. Feeding screw according to claim 1, characterized in that the outer run (2) comprises a compression section on which a spiral feeding channel (21) tapers in depth in the back-to-front direction, at least one section of the spiral air guide channel (22) being provided on the compression section.

3. The feed screw according to claim 1, characterized in that the rear end of the air guiding cavity (13) extends to meet the sealing ring portion (12).

4. The feeding screw according to claim 1, wherein the material passing channel (11) comprises an axial cavity channel which is arranged at the center of the inner glue running section (1) and extends along the axial direction of the inner glue running section, and the material inlet (110) and the material outlet (111) which are respectively communicated with two ends of the axial cavity channel.

5. The feed screw of claim 1, wherein the screw body is formed by butt-jointing at least two sections of rod bodies.

6. The feed screw according to any one of claims 1 to 5, characterized in that the air guiding cavity (13) is of a spiral groove structure.

7. The feed screw according to any one of claims 1 to 5, characterized in that the front end of the helical air channel (22) is provided in a closed manner.

8. The feeding screw according to any one of claims 1 to 5, wherein the gas passing structure is a recess (231) formed on the outer peripheral surface of the spiral rib (23) to be concave inward, and the depth of the recess (231) is not more than 0.2mm.

9. A screw barrel assembly, comprising a barrel (5) and a feeding screw rod arranged in the barrel (5), wherein the feeding screw rod is one of the feeding screw rods according to any one of claims 1 to 8, and an exhaust port (51) is arranged on the side wall of the barrel (5) and corresponds to the rear end of the air guide cavity (13).