CN2332567Y

CN2332567Y - Plastic double wall spiral tube shaping appts.

Info

Publication number: CN2332567Y
Application number: CN 97224403
Authority: CN
Inventors: 史莉英; 王丽华
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-08-09
Filing date: 1997-08-09
Publication date: 1999-08-11
Anticipated expiration: 2007-08-09

Abstract

The utility model provides a plastic double-wall spiral pipe forming device which comprises a plastic extruding machine, an extruding machine head installed on the plastic extruding machine, a cooling shaping mold positioned at the back of the extruding machine head, and a spiral winding welding mechanism, wherein an angle of 180 DEG is formed between the extruding machine head and the plastic extruding machine and between the extruding machine head ad the cooling shaping mold. The cooling shaping mold comprises a shaping wall which is sheathed outside a shaped strip, and the shape of the shaping wall is identical to that of the shaped strip; through holes are distributed on the shaping wall, and a negative pressure pumping cavity is arranged outside the shaping wall. The utility model has the advantages of high productive efficiency and good production quality.

Description

Plastic double-wall helix tube shaped device

The utility model relates to a kind of plastic shaping device.

Extrude the single bar-type bar with plastic extruder, plug method cooling and shaping single bar-type bar, hauling machine draws, and the flame method hot melt adhesion is Wrapping formed, makes the technology of plastic double-wall helix tube, is present more advanced plastic tube moulding process.But also there are many weak points:

1, production efficiency is low, and the core port of export connects a cooling type bar plug in the extruder head.Interior core and the interior cooling water that feeds of cooling plug.It is extruded, methods for cooling is: extruder head is right-angle handpiece (is extruder head and extruder are an angle of 90 degrees link together), material is under the effect of extruder extrusion pressure, turn over an angle of 90 degrees and flow out head, at die orifice place extrusion type bar, the type bar goes out behind the die orifice promptly that bag is attached on the plug, carries out cooling shaping under the effect of cooling water.There is following shortcoming in the extruder head of this structure:

A is because the type bar is to cool off by the cooling plug mode on the core in being connected, so cooling water will enter the cooling plug by interior core.At this moment, water temperature and mold temperature have individual heat exchanging process, and water temperature rises, and interior core temperature descends.For satisfying the manufacturing technique requirent of material, the technological temperature of whole extruder head will improve, thereby cause the corresponding raising of water temperature.Because the endoporus on interior core and the plug is very little, water-flowing amount seldom is difficult to satisfy the cooling requirement of stripe shape, causes the cooling and shaping weak effect.Expect cooling and shaping effect preferably, must slow down extruded velocity.So the head production efficiency of this structure is low.

B is because this structure of extrusion die, and defining it, to extrude form can only be that wall scroll is extruded, and makes the production efficiency of extruder be difficult to normal performance.

C enters cooling plug for making cooling water by interior core because mould has adopted core rod type cooling and shaping mode, and extruder head can only be designed to the right-angle type head.Be that extruder head and mould are an angle of 90 degrees and are installed together.The mounting means of this structure has increased extrusion pressure, has blocked extruding smoothly of material, influences the normal performance of production efficiency equally.

2, unstable product quality, the percent defective height.

A is because line rod cooling and shaping method is suitable for the approved product internal diameter, and section bar goes out behind the die orifice promptly that bag is attached on the plug, and the one, the profile wall thickness ununiformity is even, and the 2nd, section bar is radial drawing, and radial strength is poor.Cause the tubing after Wrapping formed very easily damaged.This is the quality instability, the factor that percent defective is high.

B is that Verneuil method makes the gluing of surfaces fusion because the type bar adopts when bonding, because what adopt is acetylene gas or liquefied gas flame, and burning incessantly, can be owing to the moisture flame instability that makes in the gas, long-time working pressure reduces or factor such as nozzle oxidation knot carbon, fusion face is produced littlely melt, narrow down or phenomenon such as molten, makes sticking seam not firm when bonding, cause intensity decline or gas leakage, infiltration, product can't be used.This is the quality instability, another factor that percent defective is high.

In addition, also there is unsafe factor in Verneuil method.Because of the polyethylene raw material belongs to inflammable nothing, the gas improper use easily causes fire incident.

3, because plug cooling and shaping method, after can not making the type bar go out die orifice is the complete type bar for direct winding that complete cooling and shaping becomes to have certain mechanical strength, so its type bar also need carry out the secondary cooling on another set of cooling die behind cooling and shaping on the plug.Make technology be tending towards complicated.

The present invention's purpose is to provide a kind of production efficiency height, can improve the plastic double-wall helix tube shaped device of yield rate and product quality.

The purpose of this utility model is achieved in that it comprises plastic extruder, be installed on the extruder head on the plastic extruder, the cooling shaping mould and the spiral that are positioned at behind the extruder head twine welding mechanism, between extruder head and the plastic extruder, all be 180 jiaos between extruder head and the cooling shaping mould, cooling shaping mould comprises the shape typing wall identical with the type bar that is enclosed within outside the type bar, be distributed with through hole on the typing wall, the typing wall is taken out negative pressure cavity outward.

The utility model can also comprise following architectural feature:

1, spiral winding welding mechanism comprises spiral winding machine structure and resistance heater, and resistance heater comprises air-pressure duct, is outside equipped with stratie at air-pressure duct.

2, the shaping mould of extruder head has two moulding holes at least, and the base in each moulding hole connects.

Compared with the prior art, this practicality has following advantage, the one, extruder head is 180 degree through types with extruder and is connected, it is bigger to extrude the cross section, the type bar that shape is complicated, this is because do not have the cooling plug on the extruder head, and is that through type is connected with extruder, do not extrude resistance so have, can bring into play to large extent and extrude usefulness.Its production efficiency can be enhanced about more than once.The 2nd, adopt the cooling vacuum typing method, cooling and Vacuum shaping carry out simultaneously.Adopt vacuum method that the type bar is carried out negative pressure in when cooling and stretch, the type bar of making reaches designing requirement and sectional dimension, improves mechanical radial strength simultaneously under the effect that stretches, and provides qualified type bar for Wrapping formed.The 3rd, once type bar cooling forming can have been omitted secondary cooling forming operation.The 4th, adopt hot blast fusion formula spiral to twine welding mechanism, compressed air fuses face by the resistance-type thermal source with 500-1000 ℃ warm-air supply type bar, and this hot blast promptly can not melt Jiao with bonding plane, the tempering of flame method can not occur, defectives such as pressure reduction yet.The moulding that can be tubing provides stable, reliable bonding plane, plays the effect of raising, assurance product quality.The 5th, the shaping mould of extruder head has two moulding holes at least, and the base in each moulding hole connects, and this structure can be extruded multiple bar formula section bar, not only can enhance productivity, and can reduce the face of fusing.In a word, the utlity model has the production efficiency height, advantages such as good product quality.

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

Fig. 2 is the structural representation of cooling shaping mould.

Fig. 3 is the A-A cutaway view of Fig. 2.

Fig. 4 is the structural representation of extruder head.

Fig. 5 is the B-B cutaway view of Fig. 4.

Fig. 6 is the cross section structure of section bar.

Fig. 7 is the structural representation of resistance heater.

For example the utility model is done more detailed description below in conjunction with accompanying drawing:

In conjunction with Fig. 1, the composition of plastic double-wall helix tube shaped device comprises plastic extruder 5, and extruder head 1, cooling shaping mould 2, transmission mechanism 3, spiral twine welding mechanism 4.Plastic extruder is positioned at foremost, is connected by the flange straight formula between extruder head and the plastic extruder, promptly is 180 degree angles between them.Cooling shaping mould is positioned at after the extruder head, and also is 180 degree angles between they the two.There are transmission mechanism and spiral to twine welding mechanism behind the cooling shaping mould.In conjunction with Fig. 4 and Fig. 5, the shaping mould of extruder head has two moulding holes, also can be plural moulding hole, and the base in each moulding hole connects, and at each place, moulding hole branching block 6 is arranged.In conjunction with Fig. 2 and Fig. 3, cooling shaping mould comprises the shape typing wall 7 identical with the type bar that is enclosed within outside the type bar, is distributed with through hole on the typing wall, and the typing wall is taken out negative pressure cavity 8,9 outward.In conjunction with Fig. 7, resistance heater comprises air-pressure duct 10 and the stratie outside air-pressure duct 11.Plastic raw materials is extruded through extruder head through plastic extruder and is extruded into multiple bar formula double-walled type bar, the type bar is introduced the cooling forming mould, cooling and shaping under suction function, the type bar that goes out the cooling forming mould is through transmission mechanism 3, after guide to spiral welding mechanism, twine through spiral, fuse and make the double-walled plastic pipe material.

Claims

1, a kind of plastic double-wall helix tube shaped device, it comprises plastic extruder, be installed on the extruder head on the plastic extruder, the cooling shaping mould and the spiral that are positioned at behind the extruder head twine welding mechanism, it is characterized in that: between extruder head and the plastic extruder, all be 180 degree angles between extruder head and the cooling shaping mould, cooling shaping mould comprises the shape typing wall identical with the type bar that is enclosed within outside the type bar, is distributed with through hole on the typing wall, and the typing wall is taken out negative pressure cavity outward.

2, plastic double-wall helix tube shaped device according to claim 1, it is characterized in that: described spiral twines welding mechanism and comprises spiral winding machine structure and resistance heater, resistance heater comprises air-pressure duct, is outside equipped with stratie at air-pressure duct.

3, plastic double-wall helix tube shaped device according to claim 1 and 2, it is characterized in that: the shaping mould of extruder head has two moulding holes at least, and the base in each moulding hole connects.