CN1944036A - Method for producing double spiral HDPE pipe - Google Patents

Abstract

The present invention relates to method of producing double spiral HDPE pipe, and features that prefabricated HDPE strip is wound onto extruded HDPE pipe and fusion adhered to the HDPE pipe by means of the heat of the extruded HDPE pipe so as to for the double spiral HDPE pipe. The present invention has the following advantages: no need of changing the structure of available extruding mold, no need of complicated production line, low cost, best utilization of the heat of the extruded HDPE pipe for firm adhesion, saving in power, high hardness and less deformation of prefabricated HDPE strip, and stable product quality.

Description

The manufacture method of double spiral HDPE pipe

Technical field

The present invention relates to the manufacture method of the member that a kind of cable-stayed bridge engineering uses, particularly relate to the manufacture method of the anti-wind, rain and vibration double-helix HDPE pipe that a kind of steel strand stay cable uses.

Background technology

Suspension cable is the lifeline of cable-stayed bridge.Large span stayed-cable bridge is because the suspension cable cable body is longer, and under the synergy of wind and rain, suspension cable can produce vibration, influences Structure Safety for Bridge.Therefore, the suspension cable that large span stayed-cable bridge is used is generally all taken measures on cable body, destroys the wind vibration frequency that causes inhaul cable vibration, with suppression of vibrations.Wind, rain and vibration resistance stay cable commonly used has two kinds of patterns: embossing drag-line and bifilar helix drag-line.The embossing drag-line is on the cable body surface pit of arranging according to certain rules to be set, and the bifilar helix drag-line is the bifilar helix that projection is set on the cable body surface.Steel strand stay cable cable body anti-wind, rain and vibration mode is on the HDPE outer tube bifilar helix to be set.At present the manufacture method of double spiral HDPE pipe commonly used is, makes the plastic extrusion die of band spiral type groove, is installed in mould on the extruding machine and mould can be rotated, directly makes and is with protruding double spiral HDPE pipe.The shortcoming of this method is: plastic extrusion die length is long, and processed complex, cost are very high.Simultaneously, tubulation production line complex structure, the helix of projection is yielding.

Summary of the invention

The objective of the invention is to overcome above-mentioned deficiency, the manufacture method of the double spiral HDPE pipe of a kind of good product performance, low cost of manufacture is provided.

The object of the present invention is achieved like this: a kind of manufacture method of double spiral HDPE pipe, it is characterized in that it is that prefabricated HDPE bar is wrapped on the HDPE pipe of extruding, rely on HDPE pipe self heat to make HDPE bar and its bond vitrified, be made into double spiral HDPE pipe.

Concrete processing step of the present invention comprises:

1) the HDPE plastic pellet after will drying enters bringing-up section by extrusion machine material barrel, enters in the plastic extrusion die extrusion molding HDPE pipe after being heated predetermined temperature;

2) before the HDPE of extrusion molding pipe goes out the Vacuum shaping device and advances bosh, a rotating head is set, coils two prefabricated HDPE bars on the rotating head in HDPE pipe periphery;

3) after the HDPE pipe pulls out plastic extrusion die, stick on the end of prefabricated HDPE bar on the HDPE pipe and compress, in the traction of HDPE pipe straight line, rotating head drives the HDPE bar and compresses while rotating around HDPE tubular axis line, the heat that utilizes HDPE pipe self with the bond vitrified of HDPE bar on the HDPE pipe;

4) traction of HDPE pipe is entered bosh, make its cooling and shaping, be made into double spiral HDPE pipe.

The sectional dimension of above-mentioned HDPE bar is about 5mm * 5mm, and the HDPE pipe is extruded its surface temperature of back and is about 200～300 ℃, so this temperature can be an one with HDPE bar and HDPE pipe strong bond.

The present invention after the HDPE pipe is extruded, utilizes the heat that himself carries under the prerequisite that does not change production line and plastics extrusion die, with prefabricated HDPE bar and HDPE pipe secure bond, be made into double spiral HDPE pipe.Determine the rotating speed of rotating head according to the pitch of the hauling speed of HDPE pipe and helix.

Therefore, the manufacture method of the present invention's double spiral HDPE pipe has the following advantages:

1, need not to change the structure of plastics extrusion die, need not to dispose complicated production line, production cost is low;

2, make full use of HDPE pipe self heat, HDPE bar and HDPE pipe is bonding firmly, energy savings;

3, the prefabricated shaping of HDPE bar, its exposed parts hardness height, not yielding, steady quality.

Description of drawings

Fig. 1 is the process chart of double spiral HDPE pipe manufacture method of the present invention.

The specific embodiment

The manufacture method of double spiral HDPE pipe of the present invention is that prefabricated HDPE bar is wrapped on the HDPE pipe of extruding, and relies on HDPE pipe self heat to make HDPE bar and its bond vitrified, is made into double spiral HDPE pipe, its concrete manufacture method such as Fig. 1.

Referring to Fig. 1, the HDPE plastic pellet after the oven dry is entered bringing-up section by extrusion machine material barrel, enter in the plastic extrusion die extrusion molding HDPE pipe after being heated predetermined temperature.After the HDPE pipe pulls out plastic extrusion die, stick on the end of prefabricated HDPE bar on the HDPE pipe and compress, in the traction of HDPE pipe straight line, rotating head drives the HDPE bar and compresses while rotating around HDPE tubular axis line, the heat that utilizes HDPE pipe self with the bond vitrified of HDPE bar on the HDPE pipe.The traction of HDPE pipe is entered bosh, make its cooling and shaping, be made into double spiral HDPE pipe.

Claims (2)

1, a kind of manufacture method of double spiral HDPE pipe is characterized in that it is that prefabricated HDPE bar is wrapped on the HDPE pipe of extruding, and relies on HDPE pipe self heat to make HDPE bar and its bond vitrified, is made into double spiral HDPE pipe.

2, the manufacture method of a kind of double spiral HDPE pipe according to claim 1 is characterized in that its concrete processing step comprises:

1) the HDPE plastic pellet after will drying enters bringing-up section by extrusion machine material barrel, enters in the plastic extrusion die extrusion molding HDPE pipe after being heated predetermined temperature;

2) before the HDPE of extrusion molding pipe goes out the Vacuum shaping device and advances bosh, a rotating head is set, coils two prefabricated HDPE bars on the rotating head in HDPE pipe periphery;

3) after the HDPE pipe pulls out plastic extrusion die, stick on the end of prefabricated HDPE bar on the HDPE pipe and compress, in the traction of HDPE pipe straight line, rotating head drives the HDPE bar and compresses while rotating around HDPE tubular axis line, the heat that utilizes HDPE pipe self with the bond vitrified of HDPE bar on the HDPE pipe;

4) traction of HDPE pipe is entered bosh, make its cooling and shaping, be made into double spiral HDPE pipe.