CN1220938A

CN1220938A - Concentric axis multi-screw plastic extruding machine

Info

Publication number: CN1220938A
Application number: CN98111563A
Authority: CN
Inventors: 张耀明; 陈强; 张振远; 郝思俊; 马永红; 王应超
Original assignee: Nanjing Glass Fiber Research & Design Inst State Bureau Of Building Material I
Current assignee: Nanjing Glass Fiber Research & Design Inst State Bureau Of Building Material I
Priority date: 1998-11-06
Filing date: 1998-11-06
Publication date: 1999-06-30
Anticipated expiration: 2018-11-06
Also published as: CN1059151C

Abstract

A plastic extruder with multiple coaxial screw bolts for manufacturing plastic products is composed of feed inlet, screw bolts, sleeve tubes, bearings and moulding head, and features that there are internal and external screw bolts and sleeve tubes, which are all coaxial with reference axis,and said internal and external sleeve tubes all have feed inlets and optional temp regulator and are communicated with moulding head. It is possible to arrange two external sleeve tubes, With the extruder, the uniform multi-layer plastic products can be extruded out.

Description

Concentric axis multi-screw plastic extruding machine

Concentric axis multi-screw plastic extruding machine belongs to the plastic products extrusion equipment.

At present, plastic extruder has two kinds: single multiple screw extruder and Bitruder.So-called single multiple screw extruder is in a barrel, a screw rod is housed carries out extrusion molding; Bitruder then is in a ∞ shape barrel, carries out extrusion molding simultaneously by two screw rods that are arranged in parallel vertically.But, no matter single screw rod or Bitruder, their common characteristic are that a barrel is only arranged, so can only extrude single material goods.When needs extrude the goods of the two or more materials that wrap up mutually, just need a plurality of extruding machine associated working of splicing, for this reason, bring a series of technical problem.

For example: the splicing of a plurality of extruder die, formed complex-shaped die head interface, make die head bulky, the design processing difficulties; Increased the resistance of Flow of Goods and Materials in the die cavity, pressure loss is increased, and pressure has been inhomogeneous; Splicing place material easily leaks, and influences product quality.

Along with scientific and technological progress and economic development, the social demand of multilayer plastic articles enlarges day by day.For example, now widely used plastic optical fiber, the core material of analysing the rate of penetrating exactly by height, low cladding of analysing the rate of penetrating is made in the coating.In order to reduce the loss of light in the conductive process, when it requires two kinds of material wire drawings, coat evenly the concentricity height.Existing spliced extruding machine is difficult to satisfy the harsh specification requirement of this series products.

Purpose of the present invention is the problem at above-mentioned existence, proposes a kind of multi-screw plastic extruding machine of concentric.It is equipped with the multilayer barrel and the screw rod of concentric on an extruding machine, can extrude the material of the multilayer heterogeneity of parcel mutually simultaneously.

Technical solution of the present invention is as follows: it is by charge door, screw rod, sleeve, bearing, formations such as die head, it is characterized in that: screw rod and sleeve all have inside and outside branch, inner screw (1) joins with bearing group (6) and is fixed in the inner sleeve (2), external screw rod (3) and bearing group (7) its inboard outside with inner sleeve (2) that joins matches, its outside matches with outer sleeve (4), in, in external screw rod (1) (3) reaches, outer sleeve (2) (4) all is concentric with the benchmark axle center, inside and outside sleeve is equipped with charging aperture (9) (10) separately, in, the opening part of outer sleeve (2) (4) all stretches in the die head (14).

For preventing anti-channeling, the leakage of material in the process of being squeezed in the inner and outer sleeves, seal washer (11) (12) also is housed at screw rod and bearing joint.

What inner sleeve charging aperture (9) added is the material of inner sleeve, and what outer sleeve charge door (10) added is the material of outer sleeve, and inside and outside sleeve is isolated mutually, and therefore two kinds of material components can be different fully.Because inside and outside screw rod and inner and outer sleeves are concentric with same axle center, it must be concentric being stranded this material of extruding.After the material of extruding passes through die head (14) moulding, just become the multilayer dose goods of heterogeneity.

It is made up of electric-heating assembly, cooling assembly and thermometric assembly also some temperature adjustment components (13) can be set respectively at the relevant position of inner and outer sleeves.Heating element heater can be electrothermal tube or heating wire, and cooling module is a metal tube, and temperature element is a thermocouple.When material in the inner sleeve need be heated, just connect the power supply of heating, just in metal tube, lead to cooling water when needing cooling.Like this, can control the extrusion temperature of material in the inner sleeve easily.Temperature adjustment component (13) generally is that founding is in the outer wall of inner and outer sleeves.The temperature control result of inner and outer sleeves can make the material operation in optimum temperature range in the inner and outer sleeves, reaches to improve the purpose that multilayer dose coats quality.

The concentric axis multi-screw plastic extruding machine that adopts technical solution of the present invention to make just can be extruded the multilayer dose goods of parcel mutually on a crowded prestige machine.This machine is simple in structure, and is reasonable in design, but a tractor serves several purposes (hold concurrently and squeeze single material).The complete machine power consumption is little, and cost is low.Can improve the quality of product greatly.Many with (hold concurrently and squeeze single material).The complete machine power consumption is little, and cost is low.Can improve the quality of product greatly.

Fig. 1 is the structural representation of concentric axis multi-screw plastic extruding machine;

Fig. 2 is concentric axis multi-screw plastic extruding machine inner sleeve temperature control, temperature measuring equipment schematic diagram;

Fig. 3 is a concentric axis multi-screw plastic extruding machine die head moulding section schematic diagram.

Below in conjunction with accompanying drawing the present invention is described in further detail;

The inner ring close-fitting of the round platform of the tail end φ 25 of inner screw (1) and bearing group (6) model 7205 is also fixing with bearing block (15) by bearing group (6) outer ring φ 52.Bearing block (15) is connected with the inner sleeve that has charge door (9) (2) by M64 * 2 left hand threads.Inner screw sealing ring (11) is equipped with in the bottom of revolving mouth at screw thread.

External screw rod (3) tail end is a dead eye that can match with the outer ring of bearing group (7) model 7217.Round platform φ 85 on the inner ring of bearing group (7) and the inner sleeve (2) matches, and thus, external screw rod (3) just cover is assigned on the outer wall of inner sleeve (2).

The outer sleeve (4) that has charge door (10) matches by the bearing block (16) that screws the with it outer ring with bearing (8) model 226, and the round platform of φ 130 matches and external screw rod sealing ring (12) is installed in position shown in Figure 1 on the inner ring of bearing (8) and the external screw rod (3).

The founding of inner and outer sleeves outer wall has helical form electrothermal tube (φ 4), (13-1,13-2) is respectively the turnover joint of electrothermal tube, simultaneously, also there is (φ 6) copper pipe (13-3,13-4) to be respectively the import and export of condensed water in the multistage founding, different parts at this outer wall also is provided with a plurality of K type thermocouples with thermometric, (13-5) is the thermometric delivery.

Inner screw (1) is driven by the inner screw drive unit, and external screw rod (3) passes through sprocket wheel (5) by the external screw rod driver drives.After material A enters inner sleeve (2) by charge door (9), along with the rotation of inner screw (1) is advanced by continuous extruding, and material B is along with after the rotation of external screw rod (3) also adds feeding mouth, and two kinds of materials will enter the die head aftershaping respectively from being extruded the cavity separately.Inner and outer sleeves is fixed on the frame respectively.

When extruding three layers of material goods, only need to join one group of bearing group (model 7232) again on the round platform outside ground floor outer sleeve (4), then second layer external screw rod and outer sleeve (4) are matched by this bearing group as need.Second layer outer sleeve is joined at the relevant position cover by another bearing (model 238) and second layer external screw rod.Obviously these three groups of screw rods and sleeve all overlap layer by layer by bearing and join, and have guaranteed multi-concentric requirement.Three groups of sleeves are individually fixed on the frame, and change die design to satisfy the needs that extrude three layered materials.

Claims

1, concentric axis multi-screw plastic extruding machine, it is by charge door, screw rod, sleeve, bearing, formations such as die head, it is characterized in that: screw rod and sleeve all have inside and outside branch, inner screw (1) joins with bearing group (6) and is fixed in the inner sleeve (2), external screw rod (3) and bearing group (7) its inboard outside with inner sleeve (2) that joins matches, its outside matches with outer sleeve (4), in, in external screw rod (1) (3) reaches, outer sleeve (2) (4) all is concentric with the benchmark axle center, in, outer sleeve is equipped with charging aperture (9) (10) separately, in, the opening part of outer sleeve (2) (4) all stretches in the die head (14).

2, concentric axis multi-screw plastic extruding machine according to claim 1 is characterized in that: temperature adjustment component (13) can be set on the outer wall of inner and outer sleeves.

3, concentric axis multi-screw plastic extruding machine according to claim 1 is characterized in that: external screw rod, outer sleeve can be 1 or 2.