CN217622019U

CN217622019U - Material drying-free exhaust screw of injection molding machine

Info

Publication number: CN217622019U
Application number: CN202221858127.3U
Authority: CN
Inventors: 韩炳欣
Original assignee: Shantou Xinweide Machinery Equipment Co ltd
Current assignee: Shantou Xinweide Machinery Equipment Co ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-10-21
Anticipated expiration: 2032-07-19

Abstract

The utility model relates to an injection molding machine exempts from to dry by fire material exhaust screw. The problems that the existing exhaust screw is incomplete in exhaust, poor in melt and pigment homogenizing effect and easy to emerge at an exhaust hole are mainly solved. The method is characterized in that: a plurality of stirring fins (4) are uniformly arranged in the spiral groove (3) of the exhaust section (2), the interval rotation angle between every two adjacent stirring fins (4) is 180 degrees, and the maximum radius of each stirring fin (4) is the same as the radius of the spiral edge of the exhaust section (2). The stirring fin in the utility model can stir the melt in the loosening exhaust section, so that the steam wrapped in the melt is released and exhausted from the exhaust hole on the barrel, and the exhaust is thorough; the stirring fins can drive the raw materials to push forwards, play a role in stirring, enable the molten materials to be fully mixed with the pigments and achieve a good homogenization effect; hold the recess and can save unnecessary raw materials, effectively avoided the material that emits, the utility model has the characteristics of simple structure, exhaust effectual and can not emit the material.

Description

Material drying-free exhaust screw of injection molding machine

Technical Field

The utility model relates to an injection molding machine part, concretely relates to injection molding machine exempts from to dry by fire material exhaust screw.

Background

An injection molding machine is a molding device for plastic parts, which uses a plastic molding die to make thermoplastic plastics or thermosetting plastics into plastic products with various shapes, and a screw injection molding machine is a relatively common injection molding machine. The working principle of the screw injection molding machine is as follows: the plastic (hereinafter referred to as melt) in a molten state (i.e., viscous state) which is plasticized is injected into a closed mold cavity by the thrust of a screw, and the plastic product is obtained after solidification and shaping. Injection molding is a cyclic process, namely, quantitative feeding → melting and plasticizing → pressure injection → mold filling and cooling → mold opening and part taking, mold closing after taking out a molded plastic part, and entering the next cycle. The specific process is as follows: granular or powdery plastic raw materials are added into a machine barrel through a charging hopper, the plastic raw materials are melted by the rotation of a screw and the heating of the outer wall of the machine barrel, then a mold is closed and an injection seat is moved forwards, a nozzle is made to be close to a sprue channel of the mold, the screw is pushed forwards, the melted materials are injected into the closed mold, and after pressure maintaining and cooling, the mold is opened to be solidified and molded, and a molded plastic product is taken out. The existing plasticizing device of the screw injection molding machine comprises a feeding device, a machine barrel and a screw, wherein the screw is positioned in the machine barrel and is driven to rotate by a driving device, and the outer wall of the machine barrel is provided with an electric heating device. The existing exhaust screw is generally divided into a feeding section, a compression section, a plasticizing section, an exhaust section, a compression section, a homogenizing section and a discharging section, wherein the screw pitches and the screw groove depths of the sections are different, the screw groove of the feeding section is deeper so as to store more raw materials, the raw materials are heated by an electric heating device outside a machine barrel and are extruded by the screw to be in a molten state, moisture contained in a molten material is vaporized to form steam, the screw groove depth of the compression section is gradually reduced so as to push the molten material according to a certain compression ratio, an exhaust hole is formed in the machine barrel and corresponds to the exhaust section, the screw groove depth of the exhaust section is deeper, when the molten material enters the exhaust section, the space is suddenly enlarged, and the steam in the molten material is also released and is exhausted from the exhaust hole in the machine barrel. The prior exhaust screw has the following technical defects when in use: 1. because the melting material is in a viscoelastic fluid state, after entering the exhaust section of the screw, part of steam is wrapped in the melting material and cannot be released, the exhaust is incomplete, and the quality of plastic products can be influenced by the residual steam. 2. Under the condition that pigment is not added, the color of the plastic product is the own color of the raw material, when the pigment needs to be added, the mixing and homogenizing between the melt and the pigment are mainly completed in a homogenizing section, and because no stirring mechanism exists, the homogenizing effect of the melt and the pigment is poor, so that the color of each part of the plastic product is different. 3. The inner wall of the exhaust hole on the machine barrel can not store redundant molten material, after the injection of the material is finished, the exhaust screw moves backwards to cause the molten material to emerge from the exhaust hole on the machine barrel, the phenomenon of material overflow occurs, and the molten material is wasted.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems that the existing exhaust screw is incomplete in exhaust, poor in homogenizing effect of molten materials and pigments and easy to emerge from an exhaust hole, the utility model provides a material drying-free exhaust screw of an injection molding machine, wherein a stirring fin is arranged in a screw groove of an exhaust section of the material drying-free exhaust screw of the injection molding machine, and the stirring fin can stir and loosen the molten materials in the exhaust section, so that steam wrapped in the molten materials is released and is exhausted from the exhaust hole on a barrel, and the exhaust is thorough; the stirring wings can drive the molten material to push forwards, play a role in stirring, and can fully mix the molten material and the pigment to achieve a better homogenization effect; be equipped with the hemisphere on the inner wall of exhaust vent department on the barrel and hold the recess, hold the unnecessary melt of recess storage, effectively avoided the material that emits. The utility model has the characteristics of simple structure, exhaust effect are good and can not the material that emits.

The technical scheme of the utility model is that: the utility model provides an injection molding machine exempts from to dry by fire material exhaust screw, includes the screw rod body, the screw rod body is structure as an organic whole, be equipped with the exhaust section on the screw rod body, evenly be equipped with a plurality of stirring wings in the thread groove of exhaust section, the corner of being separated by between the adjacent stirring wing is 180 degrees, the maximum radius of stirring wing is the same with the spiral arris radius of exhaust section.

The stirring fins are spiral flaky bodies and are distributed along the spiral direction.

The screw rod body is sequentially provided with an emptying section, a feeding section, a first compression section, a plasticizing section, an exhausting section, a second compression section, a homogenizing section and a discharging section.

The screw rod body is installed in the machine barrel, the machine barrel is provided with an exhaust hole, the exhaust hole corresponds to the exhaust section, and a semicircular spherical accommodating groove is formed in the inner wall of the exhaust hole in the machine barrel.

The machine barrel is of a two-section flange butt joint type structure, and the butt joint position of the machine barrel is arranged in the middle of the semi-spherical containing groove.

The utility model discloses following beneficial effect has: due to the adoption of the technical scheme, the stirring fin is arranged in the spiral groove of the exhaust section and can stir and loosen the melt in the exhaust section, so that steam wrapped in the melt is released and exhausted from the exhaust hole on the barrel, and the exhaust is thorough; the stirring wings can drive the molten material to push forwards, play a role in stirring, and can fully mix the molten material and the pigment to achieve a better homogenization effect; be equipped with the hemisphere on the inner wall of exhaust vent department on the barrel and hold the recess, hold the unnecessary melt of recess storage, effectively avoided the material that emits. The utility model has the characteristics of simple structure, exhaust effectual and can not emit the material.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a structural sectional view of the cylinder 12 of the present invention.

Fig. 3 is a top view of fig. 2.

Fig. 4 isbase:Sub>A cross-sectional view of the structurebase:Sub>A-base:Sub>A of fig. 2.

Fig. 5 is an enlarged view at B in fig. 1.

In the figure, 1-a screw rod body, 2-an exhaust section, 3-a screw groove, 4-a stirring fin, 5-an exhaust section, 6-a feeding section, 7-a first compression section, 8-a plasticizing section, 9-a second compression section, 10-a homogenizing section, 11-a discharging section, 12-a machine barrel, 13-an exhaust hole and 14-a containing groove.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 to 5, the material-drying-free exhaust screw of the injection molding machine comprises a screw body 1, wherein the screw body 1 is of an integral structure, an exhaust section 2 is arranged on the screw body 1, a plurality of stirring fins 4 are uniformly arranged in a screw groove 3 of the exhaust section 2, the rotation angle between every two adjacent stirring fins 4 is 180 degrees, and the maximum radius of each stirring fin 4 is the same as the radius of the screw edge of the exhaust section 2. Due to the adoption of the technical scheme, the stirring fins 4 can stir and loosen the melt in the exhaust section, so that steam wrapped in the melt is released and exhausted from the exhaust holes 13 on the cylinder 12, and exhaust is thorough; the stirring wings 4 can drive the melt to advance, and the stirring wings 4 play a role in stirring, so that the melt can be fully mixed with the pigment, and a better homogenization effect is achieved; the utility model has the characteristics of simple structure, exhaust effect are good and can not the material that emits.

The stirring fins 4 are spiral flaky bodies and are distributed along the spiral direction. The stirring wing 4 can drive the molten material to move forward, and the molten material is pushed forward.

The screw rod body 1 is sequentially provided with an emptying section 5, a feeding section 6, a first compression section 7, a plasticizing section 8, an exhaust section 2, a second compression section 9, a homogenizing section 10 and a discharging section 11. The feeding section 6 and the compression section 7 are partially overlapped together, and the second compression section 9 and the homogenization section 10 behind the exhaust section 2 are also partially overlapped together, so that the length of the screw body 1 cannot be increased, the structure is more compact, and the melt pushing efficiency is improved.

The screw rod body 1 is installed in the machine barrel 12, the machine barrel 12 is provided with an exhaust hole 13, the exhaust hole 13 corresponds to the exhaust section 2, and the inner wall of the position of the exhaust hole 13 on the machine barrel 12 is provided with a semi-spherical accommodating groove 14. The accommodating groove 14 can store redundant melt, so that the material is effectively prevented from overflowing from the exhaust hole 13 to the outside, and after one workpiece is machined, the redundant melt is positioned in the accommodating groove 14; due to the viscoelasticity of the molten material, the molten material in the receiving groove 14 is carried out and pushed forward when the next workpiece is processed.

The machine barrel 12 is of a two-section flange butt joint type structure, and the butt joint of the machine barrel 12 is arranged in the middle of the semi-spherical containing groove 14. The cylinder 12 is designed in two sections, which is mainly to facilitate the processing of the semi-spherical receiving groove 14, so that the precision of the surface smoothness, roundness and the like of the semi-spherical receiving groove 14 can meet the design requirements.

Claims

1. The utility model provides an injection molding machine exempts from to dry by fire material exhaust screw, includes the screw body (1), screw body (1) structure as an organic whole, be equipped with exhaust section (2), its characterized in that on the screw body (1): a plurality of stirring fins (4) are uniformly arranged in the spiral groove (3) of the exhaust section (2), the interval rotation angle between every two adjacent stirring fins (4) is 180 degrees, and the maximum radius of each stirring fin (4) is the same as the radius of the spiral edge of the exhaust section (2).

2. The material-drying-free exhaust screw of the injection molding machine according to claim 1, characterized in that: the stirring fins (4) are spiral flaky bodies and are distributed along the spiral direction.

3. The material-drying-free exhaust screw of the injection molding machine according to claim 1, characterized in that: the screw rod body (1) is sequentially provided with an emptying section (5), a feeding section (6), a first compression section (7), a plasticizing section (8), an exhausting section (2), a second compression section (9), a homogenizing section (10) and a discharging section (11).

4. A material-baking-free vent screw for an injection molding machine as claimed in claim 1, 2 or 3, wherein: the screw rod body (1) is installed in the machine barrel (12), an exhaust hole (13) is formed in the machine barrel (12), the exhaust hole (13) corresponds to the exhaust section (2), and a semi-spherical accommodating groove (14) is formed in the inner wall of the position of the exhaust hole (13) in the machine barrel (12).

5. The material drying-free exhaust screw of the injection molding machine according to claim 4, wherein: the machine barrel (12) is of a two-section flange butt joint type structure, and the butt joint of the machine barrel (12) is arranged in the middle of the semi-spherical containing groove (14).