CN210792017U

CN210792017U - Composite double-layer pipe extruder die core

Info

Publication number: CN210792017U
Application number: CN201921307755.0U
Authority: CN
Inventors: 陈海云; 邱洪坤
Original assignee: Guangzhou Chengxiang Machinery Co ltd
Current assignee: Guangzhou Chengxiang Machinery Co ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-19
Anticipated expiration: 2029-08-13

Abstract

The utility model discloses a compound double-deck pipe extruder mold core, the mold core includes inner mold core and outer mold core, inner mold core cup joints in the outer mold core, outer mold core outer wall is equipped with first runner, inner mold core outer wall is equipped with the second runner, outer mold core is equipped with and is used for the feed port of inner mold core feeding, outer inner mold core outer wall all is equipped with the runner structure of same shape, the runner structure includes a plurality of sprue and right a plurality of sprue reposition of redundant personnel again, the sprue is the even arc of roughly distributing, a sprue exit end communicates mutually. The utility model discloses it is even that the messenger is in the poor plastics of mobility under the molten condition such as EPDM ECO NBR material flow in the flow channel to the ejection of compact is abundant even, thereby makes inside and outside two-layer pipe wall distribution thickness of plastic double-layer pipe formed part even, has promoted product quality.

Description

Composite double-layer pipe extruder die core

Technical Field

The utility model relates to an extruder mold core field, especially a compound double-layer tube extruder mold core

Background

In the production process of tubular plastic products, the plastic extrusion process is an important process in the production process, and the forming quality of the products can be directly influenced. The plastic extrusion process is to heat plastic particle materials to be in a softened state for extrusion, and because the plastic particles have different flowability in a molten state, the design of a corresponding flow channel structure for a mold core of an extruder head is particularly important for different flowability of different plastic particles in the molten state, and for plastic (EPDM/ECO/NBR and other materials) with poor flowability in the molten state, the flow channel structure of the mold core is unreasonably designed, and the plastic flows unevenly in the flow channel, so that the inner and outer pipe walls of the composite double-layer tubular plastic molding part are unevenly distributed, and the product quality is seriously affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound double tube extruder mold core to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a compound double-layer tube extruder mold core, the mold core includes inner mold core and outer mold core, inner mold core cup joints in the outer mold core, outer mold core outer wall is equipped with first runner, inner mold core outer wall is equipped with the second runner, outer mold core is equipped with and is used for the feed port of inner mold core feeding, outer inner mold core outer wall all is equipped with the runner structure of same shape, the runner structure includes a plurality of sprue and right a plurality of sprue that the sprue shunted again, the exit end of sprue communicates mutually.

Preferably, the runner structure includes two sprue, the sprue is the arc that distributes roughly evenly, two sprue divide into two branch runners respectively, sprue and branch runner all are the symmetric distribution on the outer wall.

Preferably, the branch flow channel comprises a branch flow channel end section, and the section of the end section is gradually enlarged along the flow direction so as to evenly divide the plastic with poor flowability in a molten state.

Preferably, the first gate and the second gate perpendicular to the flow direction are provided with a flow dividing protrusion in the axial direction

Preferably, the cross-section of the projections is triangular in order to split the plastic feed which flows poorly in the molten state.

Preferably, the inner mold core and the outer mold core are tubular with gradually reduced cross-section.

Preferably, the axis of the first gate is collinear with the feedhole axis, which is coplanar and parallel to the second gate axis.

Preferably, the outlet of the branch flow channel is positioned at the front end of the inner mold core and the outer mold core, so that the stroke of plastic with poor flowability in a molten state in the flow channel is reduced, and the discharge is rich and uniform.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses be in the poor plastics of mobility such as EPDM ECO NBR material under the molten condition to the plastic material heating, runner structural design is reasonable on the inside and outside mold core outer wall, enables the poor plastics of mobility such as EPDM ECO NBR material flow evenly in the runner under the molten condition to the ejection of compact is abundant even, thereby makes the inside and outside two-layer pipe wall of plastic double-layer pipe forming part distribute thickness evenly, has promoted product quality.

Drawings

FIG. 1 is a plan view of the present invention;

fig. 2 is an expanded view of the flow channel structure of the present invention.

In the figure: 1 outer mold core, 10 first pouring gate, (11; 21) flow dividing protrusion, (12; 22) main flow channel, (13; 23) branch flow channel, 14 feeding hole, 2 inner mold core and 20 second pouring gate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 2, the present invention provides a technical solution: a mold core of a composite double-layer pipe extruder comprises an outer mold core 1 and an inner mold core 2, wherein the outer mold core 1 and the inner mold core 2 are in a pipe shape with gradually reduced sections; the inner mold core 2 is sleeved in the outer mold core 1, the outer wall of the outer mold core 1 is provided with a first pouring gate 10, the outer wall of the inner mold core 2 is provided with a second pouring gate 20, the outer mold core 1 is provided with a feeding hole 14 for feeding the inner film core, the axis of the first pouring gate 10 is collinear with the axis of the feeding hole 14, and the axis of the feeding hole 14 is coplanar and parallel to the axis of the second pouring gate 20. The first and second gates 10 and 20 are provided with flow dividing protrusions (11; 21) having a triangular cross section in the axial direction perpendicular to the flow direction, so that the plastic material having poor flowability in the molten state can be uniformly divided. The outer walls of the outer mold core 1 and the inner mold core 2 are respectively provided with a runner structure with the same shape, the runner structure comprises two main runners (12, 22), the two main runners (12, 22) are opened at respective gates, the two main runners (12, 22) are respectively divided into two branch runners (13, 23), and the main runners (12, 22) and the branch runners (13, 23) are symmetrically distributed on the outer walls. The main runner (12; 22) is in an arc shape which is approximately uniformly distributed, the branch runners (13; 23) comprise an upper section, a middle section and an end section, the upper section is communicated with the main runner, the cross section of the middle section is narrowest, the cross section of the upper section is larger than that of the middle section, the cross section of the end section is largest, the cross section of the end section is gradually enlarged along the flow direction, the outlet ends of all the branch runners on the outer wall of the outer mold core 1 are communicated with each other, namely the cross section of the outlet end of each branch runner is one fourth of the cross section of the outlet end of. Similarly, the outlet ends of all the branch channels on the outer wall of the inner mold core 2 are communicated with each other, that is, the section of the outlet end of each branch channel is one fourth of the section of the outlet end of the branch channel, so that the plastic with poor flowability in a molten state can be uniformly distributed. Meanwhile, outlets of branch flow channels (13; 23) of the outer mold core 1 and the inner mold core 2 are respectively positioned at the front ends of the outer mold core 1 and the inner mold core 2, so that the stroke of plastic with poor flowability in a molten state in the flow channels is reduced, and the discharging is rich and uniform.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a compound double-deck pipe extruder mold core, the mold core includes interior mold core and outer mold core, interior mold core cup joints in the outer mold core, outer mold core outer wall is equipped with first runner, interior mold core outer wall is equipped with the second runner, outer mold core is equipped with and is used for the feed port of interior mold core feeding, its characterized in that: the outer walls of the inner mold core and the outer mold core are provided with runner structures with the same shape, each runner structure comprises a plurality of main runners and a plurality of branch runners for redistributing the main runners, and outlet ends of the branch runners are mutually communicated.

2. The composite twin tube extruder mandrel of claim 1, wherein: the runner structure includes two sprue, the sprue is the arc that approximately distributes evenly, two sprue reposition of redundant personnel become two branch runners respectively, the sprue with branch runner all is the symmetric distribution on the outer wall.

3. The composite twin tube extruder mandrel of claim 1, wherein: the branch flow channel comprises a branch flow channel tail section, and the section of the tail section is gradually enlarged along the flow direction.

4. The composite twin tube extruder mandrel of claim 1, wherein: and the axial directions of the first pouring gate and the second pouring gate which are vertical to the flow direction are both provided with a flow dividing protrusion.

5. The composite twin tube extruder mandrel of claim 4, wherein: the cross section of the bulge is triangular.

6. The composite twin tube extruder mandrel of claim 1, wherein: the inner mold core and the outer mold core are in a pipe shape with the gradually reduced section.

7. The composite twin tube extruder mandrel of claim 1, wherein: the axis of the first gate is collinear with the feedhole axis, which is coplanar and parallel to the second gate axis.

8. The composite twin tube extruder mandrel of claim 1, wherein: and the outlets of the branch flow passages are positioned at the front ends of the inner mold core and the outer mold core.