CN101579712B

CN101579712B - Auxiliary expanding sheath

Info

Publication number: CN101579712B
Application number: CN2009100871783A
Authority: CN
Inventors: 吴大鸣; 王静; 刘颖; 任冬云; 许红; 陈卫红
Original assignee: Beijing University of Chemical Technology
Current assignee: Beijing University of Chemical Technology
Priority date: 2009-06-19
Filing date: 2009-06-19
Publication date: 2010-12-01
Anticipated expiration: 2029-06-19
Also published as: CN101579712A

Abstract

The invention relates to an auxiliary expanding sheath used for expanding the opening parts of plastic tubes. The auxiliary expanding sheath comprises a ladder barrel and a segment connected with the right end face of the ladder barrel. After being closed, each segment forms a barrel adaptive to the size of the ladder barrel by enclosure. The ladder barrel comprises a small aperture segment and a large aperture segment. The segment is articulated with the large aperture segment end of the ladder barrel; a spring is arranged at the articulation part; one end of the spring is fixedly connected with the ladder barrel and the other end thereof is connected with the segment; a roll groove used for rollers to roll is processed at the large aperture part in the ladder barrel and the roll groove is also processed in each segment; the roll groove in the ladder barrel is communicated with that in the segment. The auxiliary expanding sheath can easily expand the openings of expanded tubes and is easy to manufacture and install.

Description

Auxiliary expanding sheath

Technical field

The present invention relates to a kind of high molecular products processing, particularly a kind of auxiliary expanding sheath is applicable to the expansion of opening parts of plastic.

Background technology

Plastic pipe can be improved through its axial strength of biaxial tension and hoop intensity, and so-called biaxial tension is axial tension and adjacent circumferential expansion.Biaxial tension for plastic pipe has at present had a variety of technology both at home and abroad, and wherein the die head pulling method is used the most general.Rely on die head to finish adjacent circumferential expansion in the die head pulling method, its technology is: the plastic tube that is heated to uniform temperature is by fixing die head, because the die head maximum outside diameter is greater than the plastic pipe internal diameter, thereby realizes the adjacent circumferential expansion of plastic pipe.But,, make the expansion of the plastic tube mouth of pipe inhomogeneous so the mouth of pipe of plastic tube is piled up easily when running to the die head position, laminated because plastic pipe and die surfaces exist frictional force.The expansion of plastic pipe opening portion is a plastic tube key component of expansion continuously, how better to finish the expansion of opening portion, is a problem of endeavouring to study in the die head pulling method always.

Summary of the invention

The technical problem that auxiliary expanding sheath provided by the invention is fine above having solved has realized the even expansion to the plastic pipe opening part, and it is simple in structure, and is easy for installation, is applicable to the continuous expansion of plastic pipe.

To achieve these goals, the present invention has taked following technical scheme: comprise the split body 5 that ladder barrel 1 is connected with right side with ladder barrel 1; Surround a cylinder that adapts with ladder barrel 1 size after each split body 5 closure; Comprise small-bore section and large aperture section in the described ladder barrel 1; Described split body 5 is hinged with the large aperture section end of ladder barrel 1, is provided with spring 4 in the hinged place, and spring 4 one ends and ladder barrel 1 are connected, and the other end and split body 5 are connected.In the split body 5 and the hinged place of ladder barrel a spring is installed at least.Place, large aperture in ladder barrel inside is processed with the slot rolling 2 that is used for roller 9 rollings, and each split body inside also is processed with slot rolling 2, and the slot rolling of the slot rolling of ladder barrel inside and split body inside is connected.

Ladder barrel 1 among the present invention and split body 5 adopt rigid metal to make, and have fabulous rigidity, but homing after the metal lobe opens.

Effect of the present invention:, be convenient to install because project organization of the present invention and rigidity thereof can be carried out easily being expanded by the mouth of pipe of expander, and be produced easily.

Description of drawings

Fig. 1 (a): the schematic diagram when the present invention does not expand

The left view of Fig. 1 (b): Fig. 1 (a)

Fig. 2: the schematic diagram when the present invention expands

Fig. 3: the expansion schematic diagram when the present invention is applied to the die head stretching device

Among the figure: 1, ladder barrel, 2, slot rolling, 3, pin, 4, spring, 5, split body, 6, plastic pipe, 7, mandrel, 8, auxiliary expanding sheath, 9, roller, 10, die head.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, the auxiliary expanding sheath of present embodiment is made up of split body 5 two parts of the some on the ladder barrel 1 on the left side and the right, some stretching out arranged on the anchor ring of ladder barrel right-hand member, it is identical with the split body number to stretch out number, ladder barrel and split body rely on pin 3 to be connected stretching out the place, and all install one on each pin 3 at least and rotate spring 4.Can surround after each split body 5 closures one with the suitable cylinder of ladder barrel 1 size.See in the ladder barrel part on the auxiliary expanding sheath left side and be the ladder cylindrical hole, wherein the small cylindrical opening internal diameter of high order end is slightly larger than the external diameter of the mandrel 7 of die head, middle big column hole internal diameter is equal to or greater than mandrel 7 and roller 9 diameter sums, the big column hole dwindles in aperture, low order end place, after dwindling place's section, its inwall curve is an arc.The internal diameter of the cylinder that surrounds during each split body 5 closures equals or is slightly larger than the diameter sum of mandrel and roller.Ladder barrel inside is processed with slot rolling 2 from right-hand member to the big hole end, and each split body inside also is processed with slot rolling 2, when ladder barrel with after each split body is connected with pin, the slot rolling 2 of two parts inside connects and communicates.The size of auxiliary expanding sheath is according to the mandrel size, and roller size and quilt are expanded the plastic tube internal diameter and decided.The number of slot rolling, shape and size can be according to by the designs such as size shape of the internal diameter of expander, wall thickness and roller.

When auxiliary expanding sheath is not worked, roller 9 places 2 mouthfuls of places of slot rolling of the right split body 5, when auxiliary expanding sheath is started working, roller 9 slot rolling 2 in the split body 5 under the drive of die head 10 moves, each split body 5 opens under the effect of roller 9, when roller 9 enters ladder barrel 1 inside, since the elastic force of 4 pairs of split body outsides of rotation spring, each split body 5 closures.The physical dimension of auxiliary expanding sheath can be according to being decided by the external diameter of the internal diameter of expander, divergence ratio and mandrel.The auxiliary expanding cover material is an exotic material, and in common plastics processing temperature scope, its mechanical performance does not change.

Below by embodiment enforcement of the present invention is further specifically described, but the invention is not restricted to these embodiment.

As Fig. 3, on the die head stretching device of a two-step method, auxiliary expanding sheath passes mandrel 7 and places die head 10 anterior locations, and one group of roller 9 is arranged between auxiliary expanding sheath 8 and the die head 10, and the metal lobe number of roller 9 numbers and auxiliary expanding sheath 8 is identical.When the plastic pipe 6 more than being heated to vitrification point runs to auxiliary expanding sheath 8 positions, apply external force and promote die head 10, at this moment roller 9 is also stressed pushes in the auxiliary expanding sheath 8 along slot rolling, owing to be squeezed, auxiliary expanding sheath 8 each split bodies open, thereby heated plastic tube 6 opening parts of outside are strutted, advance die head 10, it is big more that the metal lobe of auxiliary expanding sheath 8 is opened, when roller 9 slips into the ladder barrel inside on auxiliary expanding sheath 8 left sides, because the rotation spring action of split body and ladder barrel junction, each split body is subjected to spring force in die head 10 left side closures, continue to push away near-lying mode head 10, the mouth of pipe retraction after quilt is expanded also is attached on the die head 10, thereby finishes by the enlarging work of expander.

Claims

1. auxiliary expanding sheath is characterized in that: comprise the split body (5) that ladder barrel (1) is connected with right side with ladder barrel (1); Surround a cylinder that adapts with ladder barrel (1) size after each split body (5) closure; Comprise small-bore section and large aperture section in the described ladder barrel (1); Described split body (5) is hinged with the large aperture section end of ladder barrel (1), is provided with spring (4) in the hinged place, and spring (4) one ends and ladder barrel (1) are connected, and the other end and split body (5) are connected; Place, large aperture in ladder barrel inside is processed with the slot rolling (2) that is used for roller (9) rolling, and each split body inside also is processed with slot rolling (2), and the slot rolling of the slot rolling of ladder barrel inside and split body inside is connected.

2. a kind of auxiliary expanding sheath according to claim 1 is characterized in that: in the split body (5) and the hinged place of ladder barrel a described spring (4) is installed at least.