CN100460185C

CN100460185C - Return-flow preventing apparatus

Info

Publication number: CN100460185C
Application number: CNB2006100540895A
Authority: CN
Inventors: 黄步明
Original assignee: GUANGDONG HONGLI MACHINE CO Ltd
Current assignee: GUANGDONG HONGLI MACHINE CO Ltd
Priority date: 2006-02-17
Filing date: 2006-02-17
Publication date: 2009-02-11
Anticipated expiration: 2026-02-17
Also published as: CN101024302A

Abstract

The invention relates to anti reflux unit. It includes screw head, clapped ring and seat of which fitting surface is conical surface. Its feature is that the front of the screw head is set more than three flutes of which relative retaining part is formed more than three valves; the clapped ring inner wall is correspondingly set more than three injection molding passages of which relative retaining part is formed more than three bosses; two of them is set position limited gap matched with the one on the screw head to make it rotate relatively along clapped ring radial direction, make the valve open or close the passage. The valve on the screw head of the invention can directly close the injection molding passage to prevent the material from refluxing, ensure injection molding quantity, product quality. In addition, it has reasonable structure, simple processing, convenient assemble and disassemble.

Description

Back-flow preventer

Technical field

The present invention relates to a kind of back-flow preventer that is used on the injection machine.

Background technology

Existing injecting head device comprises three smallclothes, i.e. screw head, check ring and non-return seat.In injection moulding process, the conical surface on check ring and the non-return seat is close to, and the melt of blocking-up screw head front end refluxes, and reaches the purpose of injection moulding.But at melten gel and taking out in the glue process, the sealing cone of check ring and non-return seat is no longer fitted, because the pressure and the temperature of screw head front and back end melt there are differences, so melt can flow on the runner between check ring and the non-return seat unavoidably when taking out glue, feasible like this shot difference once more, thus directly have influence on quality of item.

Summary of the invention

The purpose of this invention is to provide a kind ofly when taking out glue, can effectively prevent the back-flow preventer that melt refluxes.

In order to achieve the above object, the present invention realizes like this, comprise screw head, check ring and non-return seat, the mating surface of check ring and non-return seat is the conical surface, it is characterized in that: screw head leading portion vertebra head position etc. is arranged with the groove more than three of being convenient to injection moulding, its position that keeps relatively forms the gate more than three, with the injection channel that also is provided with accordingly on the check ring inwall that screw head axially cooperates more than three, its position that keeps relatively forms the boss more than three, staggeredly on two boss therein be provided with spacing breach, on screw head, be provided with the two row's positive stop lug boss that match with spacing breach size, thereby the relative check ring of screw head can radially do spacing clockwise or rotate counterclockwise, make that the gate on the screw head can open or close the injection channel on the check ring.

The present invention further is improved to, the two ends of check ring inwall respectively symmetry be provided with injection channel more than three, its position that keeps relatively forms the boss more than three, staggeredly on two boss therein is provided with spacing breach.The gate on the screw head and the mating surface of check ring are the conical surface.

The present invention further is improved to again, screw head leading portion vertebra head position etc. is arranged with four grooves being convenient to injecting glue, its position that keeps relatively forms four gates, also be provided with four injection channel accordingly on the two ends of the check ring inwall that axially cooperates with screw head, its position that keeps relatively forms four boss, and interlocking on two relative therein boss is provided with spacing breach.The stage casing inwall of check ring is an even surface.

The present invention compared with prior art has following advantage:

1, the gate on the screw head can directly be closed injection channel, prevents when taking out glue that melt from refluxing, and guarantees shot, the product quality height;

2, stop screw head and hidden the bad phenomenon that goods that material causes jaundice has reached stain;

3, processing rational in infrastructure is simple, assembly and disassembly convenient.

Description of drawings

Fig. 1 is a stereogram of the present invention;

Fig. 2 is the stereogram of the screw head of Fig. 1 of the present invention;

Fig. 3 is the stereogram of the check ring of Fig. 1 of the present invention;

Fig. 4 partly cuts open figure for Fig. 1's of the present invention;

Left view during non-return for Fig. 1 of the present invention removes melten gel state of Fig. 5;

Left view when non-return for Fig. 1 of the present invention removes of Fig. 6 takes out gluey attitude.

The specific embodiment

Below in conjunction with drawings and Examples the present invention is done further detailed description:

Shown in Fig. 1-6, comprise screw head 1, check ring 2 and non-return seat 3.Check ring 2 is the conical surface with the mating surface of non-return seat 3; Screw head 1 leading portion vertebra head position etc. is arranged with four grooves 4 being convenient to injection moulding, and its position that keeps relatively forms four gates 5; Also be provided with four injection channel 6 accordingly on the two ends of check ring 2 inwalls that axially cooperate with screw head 1, its position that keeps relatively forms four boss 7, interlock on Dui Ying two boss 7 therein and be provided with spacing breach 8, on screw head 1, be provided with the two row's positive stop lug boss 9 that match with spacing breach 8 sizes, thereby screw head 1 relative check ring 2 can radially do spacing clockwise or rotate counterclockwise, make that the gate 5 on the screw head 1 can open or close the injection channel on the check ring 26; Gate 5 on the screw head is the conical surface with the mating surface 21 of check ring; The stage casing inwall of check ring 2 is an even surface.

During use, in the melten gel process, screw rod rotates counterclockwise, gate 5 on the screw head 1 is opened, melten gel travels forward along helicla flute, and under the effect of melten gel thrust, check ring 2 also travels forward, separate with non-return seat 3, melten gel arrives the cavity of machine barrel front end through the groove 4 of the injection channel on the check ring 26 on screw head 1 along non-return seat 3.When melten gel finishes when beginning to take out glue, screw rod clockwise rotates an angle, because the effect of the positive stop lug boss 9 on the screw head 1, driving check ring 2 rotates simultaneously, at this moment, screw head 1 upper lock gate 5 overlaps with injection channel 6 on the check ring 2, thereby plays the non-return effect that screw head rear and front end melten gel body no longer crosses, and guarantees the repeatable accuracy of injection volume.

Claims

1. back-flow preventer, comprise screw head (1), check ring (2) and non-return seat (3), check ring (2) is the conical surface with the mating surface of non-return seat (3), it is characterized in that: screw head (1) leading portion vertebra head position etc. is arranged with the groove more than three (4) of being convenient to injection moulding, its position that keeps relatively forms the gate (5) more than three, with the injection channel (6) that also is provided with accordingly on check ring (2) inwall that screw head (1) axially cooperates more than three, its position that keeps relatively forms the boss (7) more than three, two boss (7) are gone up the staggered spacing breach (8) that is provided with therein, on screw head (1), be provided with the two row's positive stop lug boss (9) that match with spacing breach (8) size, thereby screw head (1) relatively check ring (2) can radially do spacing clockwise or rotate counterclockwise, make that the gate (5) on the screw head (1) can open or close the injection channel (6) on the check ring (2).

2. according to the described back-flow preventer of claim 1, it is characterized in that: the two ends of check ring (2) inwall are respectively equipped with the injection channel (6) more than three, its position that keeps relatively forms the boss (7) more than three, and two boss (7) are gone up the staggered spacing breach (8) that is provided with therein.

3. according to claim 1 or 2 described back-flow preventers, it is characterized in that: screw head (1) leading portion vertebra head position etc. is arranged with four grooves (4) of being convenient to injection moulding, its position that keeps relatively forms four gates (5), with also be provided with four injection channel (6) accordingly on check ring (2) the inwall two ends that screw head (1) axially cooperates, its position that keeps relatively forms four boss (7), and relative therein two boss (7) are gone up the staggered spacing breach (8) that is provided with.

4. according to the described back-flow preventer of claim 1, it is characterized in that: the gate of (1) (5) is the conical surface with the mating surface (21) of check ring (2) on the screw head.

5. according to claim 1 or 2 described back-flow preventers, it is characterized in that: the stage casing inwall of check ring (2) is an even surface.