CN2396950Y

CN2396950Y - Integrated injection moulding die core (1) of plastic pipe with flexible mouthpiece

Info

Publication number: CN2396950Y
Application number: CN 99230114
Authority: CN
Inventors: 方家麟
Original assignee: Jiangyin David Plastics Co ltd
Current assignee: Jiangyin David Plastics Co ltd
Priority date: 1999-11-27
Filing date: 1999-11-27
Publication date: 2000-09-20
Anticipated expiration: 2009-11-27

Abstract

The utility model relates to an injection moulding die core of a plastic pipe fitting with a flexible mouthpiece, which comprises a core shaft 6, a core lug assembly arranged on the core shaft 6, an insert seat 7, a push ring 10, a wedge sleeve 5 arranged at the back end of the core shaft, and an oil cylinder. Annular bulges 12, 11 are manufactured at the front end of the core lug assembly which is composed of a plurality of large inserts 9 and small inserts 8, wherein, the large inserts 9 and the small inserts 8 are uniformly distributed at intervals in the radial direction. The bottom surfaces of the back ends of the large inserts and the small inserts are respectively made into inner inclined surfaces 16, 18, included angles between the inner inclined surfaces and the radial direction of the core shaft are beta and alpha, and alpha is larger than beta. The large inserts and the small inserts are connected with the insert seat through positioning pins 17, 15. The push ring 10 which is arranged in an inner cavity of the core lug assembly is connected with a piston rod 1 of the oil cylinder. The core has the advantages of simple moulding and good product quality.

Description

Flexible interface plastic pipe integral molded plastic mould core (one)

The utility model relates to a kind of flexible interface plastic pipe integral molded plastic mould core, is used for the single injection-molded of plastic pipe bellmouth inner groovy (can be square and circular arc type).

Existing plastic pipe bellmouth inner groovy, general what adopt is secondary thermoforming enlarging or first injection moulding after the technology of turning processing inner groovy, the pipe fitting that this technology is made, its bellmouth inner groovy moulding degree is undesirable, poor sealing performance, and waste of material is big, plastic part quality is poor, and production efficiency is low.

The flexible interface plastic pipe mould core that provides a kind of pipe fitting bellmouth inner groovy moulding degree good is provided the purpose of this utility model.

The purpose of this utility model is achieved in that a kind of flexible interface plastic pipe integral molded plastic mould core, and it comprises mandrel, is sleeved on the core projection assembly on the mandrel, wedge cover and the action tank of inserting seat, throw-out collar and being connected core back-end.Be shaped on annular protrusion on the core projection assembly front end outside wall surface, projection is corresponding with mould external mold upper groove, core projection assembly is made up of a plurality of radially alternate uniform large and small inserting, the large and small bottom surface, rear end of inserting is made interior inclined-plane respectively, interior inclined-plane and mandrel angle radially is respectively β and α, and α＞β, and the large and small rear end of inserting links to each other with the seat of inserting by alignment pin, throw-out collar places core projection assembly inner chamber, and its rear end links to each other with the oil cylinder piston bar.

The large and small flare up of inserting protrudes shape before the injection moulding, and large and small inserting shunk its projection in core, to realize the extraction of whole core when die sinking was finished in injection moulding.Large and small opening and shrink by reciprocating motion of the pistons of inserting realizes that piston is then by hydraulic-driven.When opening large and small inserting, the state of throw-out collar and the large and small whole inner cavity of inserting reaches when integrated, and this locking bearing capacity of inserting is very high.

Compare with existing pipe fitting bellmouth inner groovy forming technique, but adopt this mold cores single injection-molded, bellmouth inner groovy moulding degree is good, and good seal performance saves material, and plastic part quality is good.

Fig. 1 is a structural representation of the present utility model.

Below in conjunction with accompanying drawing the utility model being done one describes in detail:

As shown in Figure 1, a kind of flexible interface plastic pipe injection forming mold core, it includes: mandrel 6, be sleeved on core projection assembly on the mandrel 6, the seat 7 of inserting, push away bad 10 and the wedge cover 5 and the action tank that are connected mandrel 6 rear ends.Be shaped on annular protrusion 12,11 on the core projection assembly front end outside wall surface, projection 12,11 is corresponding with the groove 13 on the mould external mold 14, core projection assembly 9,8 is made up of a plurality of radially alternate uniform large and small inserting, the large and small bottom surface, rear end of inserting is made interior inclined-plane 16,18 respectively, interior inclined-plane 16,18 and mandrel 6 angle radially are β and α, and α＞β.Large and small 9,8 rear ends of inserting link to each other with the seat of inserting by

alignment pin

17,15, and throw-out collar 10 places core projection assembly inner chamber, and its rear end links to each other with oil cylinder piston bar 1 with piston rod coupling block 2 by throw-out collar bolt 3.Wedge cover 5 usefulness joint bolts 4 are packed in external mold 14 rear ends.

Operation principle:

1, during core closure (being the mould matched moulds), moves forward, thrust is passed to throw-out collar 10, will insert 8 then for a short time, inserting greatly 9 struts and be closed into holistic core by throw-out collar bolt 3 by oil cylinder piston bar 1.

When 2, core draws (being the mould die sinking) in, under the effect of oil cylinder, the mobile backward L distance of oil cylinder piston bar, throw-out collar 10 is (because α is greater than β) under the pulling force effect of throw-out collar bolt 3, for a short time insert and turn over the differential seat angle of alpha-beta earlier, then for a short time inserting 89 turns over angle beta with inserting greatly, inserts for a short time this moment 8 to be rolled in and to insert greatly in 9, inserts greatly 9 originally to be combined into d ₂Reduced diameter to circumscribed circle diameter less than d ₁, and oil cylinder piston bar 1 continues to move backward, then core can be deviate from from product smoothly.

This is a working cycles of this bellmouth core.

Claims

1, a kind of flexible interface plastic pipe injection forming mold core (one), it is characterized in that it comprises: mandrel (6), be sleeved on the core projection assembly on the mandrel (6), insert (7), throw-out collar (10) and the wedge cover (5) and the action tank that are connected core back-end, be shaped on annular protrusion (12) (11) on the core projection assembly front end outside wall surface, projection (12) (11) are corresponding with the groove (13) on the mould external mold (14), core projection assembly is by a plurality of radially alternate uniform big, for a short time insert (9), (8) form, greatly, for a short time the bottom surface, rear end, (9) (8) of inserting is made interior inclined-plane (16) (18) respectively, interior inclined-plane (16), (18) be β and α with mandrel (6) angle radially, and α＞β, greatly, for a short time insert (9), (8) rear end is by alignment pin (17), (15) link to each other with the seat (7) of inserting, throw-out collar (10) places core projection assembly inner chamber, and its rear end links to each other with oil cylinder piston bar (1).