CN209289722U - A kind of preparation facilities of high voltage direct current valve tower branch water pipe sheath - Google Patents

Abstract

The utility model discloses a kind of preparation facilities of high voltage direct current valve tower branch water pipe sheath, device includes sequentially connected extruder, cooling and shaping mechanism, dragger, rotary knife cutter, the front end of extruder is provided with tube extruding machine head, tube extruding machine head includes handpiece body and is set to the intracorporal rotating die device of head, rotating die device includes supporter, squeeze nozzle mould, bearing, supporter is provided with ladder hole along axial direction, a bearing is laid in it, nozzle mould is squeezed by bearing support, the front end of mouth mold is equipped with driving wheel, driving wheel is connect with a driving mechanism, when driving wheel rotates, it squeezes nozzle mould and handpiece body forms dynamic cooperation.The rotation speed of nozzle mould is squeezed by adjusting, forms the VELOCITY DISTRIBUTION and stress distribution different along pipe thickness direction, and macromolecular melt can be induced to generate the orientation texture along sheath circumferential direction direction.Sheath through circumgyration incision preparation is due to eliminating weld mark, and mechanical property is more preferable, more resistant to environmental stress cracking.

Description

A kind of preparation facilities of high voltage direct current valve tower branch water pipe sheath

Technical field

The utility model relates to the preparation technical fields of high molecular material, and in particular to a kind of high performance polymer sheath Preparation facilities.

Background technique

High voltage direct current valve tower branch water pipe is the important equipment in high voltage direct current valve tower, due to installation space and running environment Limitation, need external protection coating, i.e., it is commonly referred " sheath ".Common sheath is by materials such as polyolefine material or EVA It is made, polyolefin jacket mainly by the auxiliary agents such as polyvinyl resin and antioxidant, colorant, dispersing agent, fire retardant, is squeezed through melting It is prepared out.EVA sheath is also prepared by mixings such as antioxidant, colorant, dispersing agent, fire retardants.Due to high voltage direct current The particularity of valve tower, high voltage direct current valve tower branch water pipe are run under higher temperature environment throughout the year, and there are vibration, and periphery in when operation There are the strong electrical fields that strong voltage is formed, and have strict demand to the performance of sheath material, it is desirable that sheath has excellent high-low temperature resistant, resistance to The performances such as stress cracking, insulation, fire-retardant.

It is used using polyolefin and EVA blending modified material as high voltage direct current valve tower branch water pipe sheath material, due to Factors influence, and there is a problem of that performance is unstable, as physical mechanical property is poor, resisting environmental stress and cracking (ESCR) performance It is poor, be used for a long time it is easy to aging, jacket surface coefficient of friction is big the problems such as, thus influence branch water pipe long-time service safety Property.The mechanical performance and antioxygenic property of the polyolefin after long period use and EVA branch water pipe sheath be all after tested A sharp decline, flame retardant property also due to fire retardant migration precipitation degradation, the precipitation of fire retardant also can be to environment It pollutes, this all causes to seriously affect to the security performance of high voltage direct current valve tower.

There are 2 kinds of methods when preparing sheath, a kind of method is to directly extrude band-like material using flat mouth mold by extruder Material is wound into enforcement through rotation and uses；Second method is to be extruded into plastic tube by extruder circular mouth mold to carry out circumgyration incision again It forms.It is wrapped bad when in use using sheath material prepared by first method, branch water pipe cannot be carried out abundant Protection；Then second method is cut using the extrusion method of common plastics pipe, although right after plastic tube circumgyration incision The winding compactness of branch water pipe is resolved, but uses the sheath of this method preparation, and macromolecular orientation is along plastic tube Squeeze out direction orientation, plastic tube when squeezing out since the presence of mouth mold bracket cannot be completely eliminated weld mark, in this way prepared by Sheath, per all haveing the defects that weld mark on a bit of there are caused, sheath mechanical property is minimum at weld mark, is easy hair Raw stress cracking, in addition, through sheath made of the cutting of conventional extrusion plastic pipe, since the orientation of tubing is along the extrusion direction of pipe Orientation, therefore, in the case that in the case that temperature is slightly higher or long-time is using creep is generated, sheath can be along the extrusion direction of tubing It generates disorientation (contraction), the ring cutting position that will lead to sheath in this way generates larger spacing, so that sheath protects branch's water It manages insufficient.

Groos (B.Groos, UK.Pat., 946371,1964) utilizes the plug and mouth being directly connected with extruder screw The rotation of mould realizes polymer molecular chain circumferential direction orientation first, improves the circumferential intensity of polymer pipe.Shepherd etc. (G.W.Shepherd, H.G.Clark andG.W.Pearsall, Polymer Engineering and Science, 1976, 16:827) using the rotation of plug at mouth mold, the extrusion of HIPS and HDPE pipe is realized.The experimental results showed that the spiral flow of melt It moves so that pipeline internal flaw reduces and polymer molecule chain orientation.Worth (R.A.Worth, Polymer Engineering And Science, 1980,20:551) weld mark for squeezing out pipeline is improved by rotary extrusion, improve the mechanical property of pipeline Energy.Bevis (P.S.Allan, M.J.Bevis, Plastics, Rubber and Composites, 1991,16:133) is into one Step improves rotary extrusion device, flows melt along plug circumferential direction by the push-and-pull campaign of four pistons, more efficiently real The orientation for having showed polymer molecular chain has obtained preferable result.Wang Qi etc. (CN 101337425 B, 2008) is also practical new A kind of method of rotating extrusion plastic tubing of type.The above method can effectively eliminate the defect of conventional extruding pipe material, and macromolecular Segment is orientated along tubing circumferential direction, and circumferential intensity is greatly improved.But some problems are still had, such mode was not applied Onto band-like protective covering of water pipe, band-like protective covering of water pipe there are stress big, the not high problem of circumferential intensity.Also, usual sheath When in use directly with scissors cutting carry out using, in the place of cutting there are acute angle, vibration when branch water pipe works so that Sheath acute angle is often collided with the branch water pipe of work, is easy to scratch branch water pipe in this way, be even resulted in branch water pipe Water outflow cause the serious consequences such as high voltage direct current valve tower short circuit.

Utility model content

The purpose of this utility model is to provide a kind of preparation facilities of high voltage direct current valve tower branch water pipe sheath, can disappear Except the circumference stress that sheath generates in process of production, sheath both ends are cut into arc-shaped, will not scratch water pipe, thus reduce because Branch water pipe is damaged and causes the accident of valve tower short circuit.

In order to achieve the above object, the utility model proposes technical solutions below:

The preparation facilities of the utility model high voltage direct current valve tower branch water pipe sheath is to utilize polymer in process The characteristics of to stress sensitive, applies simultaneously during tubular object extruding and adjusts taking for the rotation field of force, control and fixed macromolecular Circumgyration incision, final preparation high, resistance to long-term creep with circumferential intensity are carried out to structure, and according to matching rotation speed High voltage direct current valve tower branch water pipe sheath this principle be designed.

The device includes sequentially connected extruder, rotation tube extruding machine head, cooling and shaping mechanism, dragger, circumgyration incision Machine, rotation tube extruding machine head is made of handpiece body and rotating die device, rotating die device include supporter, crowded nozzle mould, Bearing, supporter are provided with ladder hole along axial direction, inside lay a bearing, squeeze nozzle mould and are supported by it, and squeeze nozzle mould and stretch out In the front end of supporter, the front end of the crowded nozzle mould is provided with driving wheel, and driving wheel connects a driving mechanism, driving mechanism band Dynamic driving wheel rotation squeezes the rotation of nozzle mould to drive, makes to squeeze nozzle mould and handpiece body forms dynamic cooperation.

When processing, polymer material, by the rotation speed of mouth mold, can be formed along thickness of pipe wall after extruder melting extrusion Direction different VELOCITY DISTRIBUTION and stress distribution are spent, so as to regulate and control the orientation texture of macromolecular in tube wall, and passes through cooling dress It sets and orientation texture is carried out determining structure and then realizes the macromolecular circumferential direction orientation of sheath, and the high voltage direct current prepared through circumferential cutting Valve tower branch water pipe sheath does not have weld mark, and circumferential orientation, to greatly improve the circumferential direction and anti-cracking performance of sheath.The dress Set can not only produce preparation high voltage direct current valve tower branch water pipe sheath, can also prepare sheath for various purposes, such as electric wire, Cable and the material for needing to protect using sheath.

For sheath after extruder extrusion, cooling, traction machine travel sheath by cooling and shaping mechanism enter circumgyration incision In machine, rotary knife cutter includes a pedestal, is provided with guide pipe between the two sidewalls of the pedestal, is stretched out from the extruder Protecting pipe is arranged in the guide pipe, and extends to the outside of end side wall, and the protecting pipe can rotate in the guide pipe, It is provided with cutter outside the end side wall, the central axis of the Pivot axle of the cutter and the guide pipe is same On horizontal line, a motor is also equipped on the pedestal, the work of cutter described in the motor driven can cut circular jacket pipe It is cut into sheath, sheath both ends are finally cut into arc-shaped, both ends sharp parts is can avoid and branch water pipe is caused to scratch.

For the particularity of high voltage direct current valve tower, sheath prepared by common polyolefine material and EVA material has many Defect, the utility model are made using the one-component or its mixed component of fluoroplastics or fluorubber and silicon rubber Standby, fluoroplastics or fluorubber and silicon rubber all have good corrosion resistance, mechanical performance, electrical insulation capability, radiation hardness Property and fabulous ageing-resistant performance.

In order to preferably squeeze out application and preparation in the sheath of high voltage direct current valve tower branch water pipe, the fluoroplastics that can be used alone, Fluorubber and silicon rubber carry out rotary extrusion and matching circumgyration incision speed prepares sheath, in order to adjust prepared Sheath hardness, fluoroplastics and fluorubber co-extrusion can be used for sheath, fluoroplastics can also be used and silicon rubber co-extrusion is standby Sheath, can also fluoroplastics and fluorubber and silicon rubber co-extrusion for sheath.

Meanwhile a kind of preparation method using above-mentioned apparatus preparation high voltage direct current valve tower branch water pipe sheath being provided, including Following steps:

Step 1: preparation raw material, using the mixed of fluoroplastics/fluorubber/silicon rubber or its mixed component or three two-by-two It is combined and is allocated as raw material；

Step 2: it sets the operating temperature of extruder, squeeze the rotation of pipe extruded velocity, mouth mold rotation speed and cutting blade Speed；

Step 3: the preparation facilities for starting the high voltage direct current valve tower branch water pipe sheath prepares the sheath；

Step 4: the sheath both ends are cut into circular shape.

The crowded nozzle mould rotation speed is 20r/s-200r/s.

The blade rotation speed of the cutting machine is identical as the crowded nozzle mould rotation speed.

The utility model compared with prior art, there is following features:

The utility model devises mouth mold rotating device in tube extruding machine head, and the rotation speed of nozzle mould is squeezed by adjusting, The VELOCITY DISTRIBUTION and stress distribution different along pipe thickness direction are formed, macromolecular melt can be induced to generate along sheath circumferential direction side To orientation texture.Through high voltage direct current valve tower branch water pipe sheath is due to eliminating weld mark made of circumgyration incision, to make Its mechanical property is more preferable, more resistant to environmental stress cracking.The both ends of sheath carried out it is round and smooth processing avoid in use process due to The scuffing to branch water pipe that vibration generates injures.

By the device, single fluoroplastics, fluorubber, silastic material sheath can be not only prepared, it is multiple can also to prepare it Sheath with rear material, and the equipment is also suitable for preparing various high molecular material sheaths.It can make the ring of sheath by the device It is improved to performance, stress crack resistant ability is enhanced, protection materials needed for more conducively protecting.

Detailed description of the invention

Fig. 1 is the schematic diagram of the utility model high voltage direct current valve tower branch water pipe sheath preparation facilities.

Fig. 2 is the cross-sectional view for rotating tube extruding machine head device.

Fig. 3 is the cross-sectional view of rotary knife cutter.

Appended drawing reference:

10- extruder, 20- cooling and shaping mechanism, 30- dragger, 40- rotary knife cutter, 41- pedestal, 42- guide pipe, The crowded nozzle mould of 43- cutter, 44- motor, 45- second bearing, 50- tube extruding machine head, 51- handpiece body, 52- supporter, 53-, 54- first bearing, 55- driving wheel, 60- protecting pipe.

Specific embodiment

The content of the utility model is described in further details with reference to the accompanying drawings and detailed description.

As shown in Figure 1, the utility model high voltage direct current valve tower branch water pipe sheath preparation facilities includes sequentially connected squeezes Machine 10, cooling and shaping mechanism 20, dragger 30, rotary knife cutter 40, the front end of extruder 10 are provided with tube extruding machine head 50 out.Such as Shown in Fig. 2, tube extruding machine head 50 includes handpiece body 51 and is set to the intracorporal rotating die device of head, and rotating die device includes Supporter 52 squeezes nozzle mould 53, bearing 54, and supporter 52 is provided with ladder hole along axial direction, interior to place the bearing 54, squeezes nozzle Mould 53 is supported by bearing 54, and the front end of mouth mold 53 is equipped with driving wheel 55, and driving wheel 55 is connect with a driving mechanism (not shown), Its rotation can be driven by driving mechanism, make to squeeze nozzle mould 53 and formed to move with handpiece body 51 to cooperate, and rotation speed is adjustable, forms edge Pipe thickness direction different VELOCITY DISTRIBUTION and stress distribution can induce macromolecular melt to generate taking along sheath circumferential direction direction To structure.Through high voltage direct current valve tower branch water pipe sheath made of circumgyration incision due to eliminating weld mark, to make its mechanics Performance is more preferable, more resistant to environmental stress cracking.Single screw rod or double screw extruder can be used in extruder 10.

It is cooling through cooling and shaping mechanism 20 after protecting pipe 60 is come out by extruder 10, then be oriented to and position through guide pipe, by Dragger 30 is pulled into rotary knife cutter 40.Rotary knife cutter 40 includes a pedestal 41, and pedestal is provided between 41 two sidewalls Guide pipe 42, protecting pipe are led through guide pipe 42 back into being set in the cutter 43 of 41 one end side wall of pedestal, cutter 43 It is fixedly connected on side wall by bearing 45 being fixed on side wall.A motor 44 is also equipped on pedestal, motor 44 drives Cutter 43 work.Cutter 43 carry out circumgyration incision to protecting pipe, and cutting blade rotation speed is adjustable.

Extruder 10, cooling and shaping mechanism 20, dragger 30 in the present apparatus and driving mechanism are well known conventional set It is standby, therefore omit and do not state.

The following are the specific embodiments that high voltage direct current valve tower branch water pipe sheath is prepared by the device.

Embodiment 1

It for 100%PVDF 2500-20 is raw material that the present embodiment, which uses mass fraction, utilizes device preparation, and setting squeezes out Machine temperature is 175 DEG C, and protecting pipe extruded velocity is 1m/min, and squeezing nozzle mould rotation speed is 100 r/s, and circumgyration incision revolving speed is 100r/s, prepared jacket surface is smooth, its tensile break strength is 25MPa after tested, more not oral than using same procedure The tensile break strength of the prepared sheath of mould rotation improves about 20%；Using rotating die method through prepared by circumgyration incision After sheath is wound pipe, heating tested, it is observed that and test, disorientation occur while sheath to protection materials packet What is wrapped up in is closer；Combustion testing extinguishes immediately from fire.

Embodiment 2

The present embodiment uses mass fraction for 100% fluororubber 246 raw material, is prepared using the device, and extruder temperature is 180 DEG C, when protecting pipe extruded velocity is 1m/min, squeezing nozzle mould rotation speed is 200r/s, and circumgyration incision revolving speed is 200r/s When, prepared jacket surface is smooth, its tensile break strength is 18MPa after tested, than being revolved using same procedure without mouth mold The tensile break strength for turning prepared sheath improves about 23%；Using rotating die method through sheath pair prepared by circumgyration incision After pipe is wound, heating tested, it is observed that and test, disorientation occur while sheath to protection materials wrap up more Closely；Combustion testing extinguishes immediately from fire.

Embodiment 3

The present embodiment uses mass fraction for 100% silicon rubber Z150 raw material, is prepared using the device, and extruder temperature is 135 DEG C, when protecting pipe extruded velocity is 0.5m/min, squeezing nozzle mould rotation speed is 50r/s, and circumgyration incision revolving speed is 50r/s When, prepared jacket surface is smooth, its tensile break strength is 6.3MPa after tested, than using same procedure without mouth mold The tensile break strength of the prepared sheath of rotation improves about 26%；Using rotating die method through shield prepared by circumgyration incision Set pipe is wound after, heating tested, it is observed that and test, disorientation occur while sheath to protection materials wrap up It is closer；Combustion testing extinguishes from fire.

Embodiment 4

It for 50%PVDF 2500-20 and mass fraction is that 50% fluororubber 246 raw material is that the present embodiment, which uses mass fraction, Raw material is prepared using the device, and extruder temperature is 180 DEG C, and protecting pipe extruded velocity is 0.5m/min, squeezes nozzle mould rotation speed Degree is 50r/s, and when circumgyration incision revolving speed is 50r/s, prepared jacket surface is smooth, its tensile break strength is after tested 20MPa, than improving about 18% without the tensile break strength of the prepared sheath of mouth mold rotation using same procedure；Using rotation After mouth mold method sheath prepared by the circumgyration incision is wound pipe, heating is tested, it is observed that with test, disorientation hair Sheath wraps up protection materials closer while raw；Combustion testing extinguishes immediately from fire.

Embodiment 5

The present embodiment use mass fraction for 40%PVDF 2500-20 and mass fraction be 30% fluororubber 246 raw material and Mass fraction is that 30% silicon rubber Z150 is raw material, is prepared using the device, and extruder temperature is 175 DEG C, and protecting pipe squeezes out speed Degree is 1m/min, and squeezing nozzle mould rotation speed is 100r/s, when circumgyration incision revolving speed is 100 r/s, prepared jacket surface Smooth, its tensile break strength is 12MPa after tested, than the stretching using same procedure without the prepared sheath of mouth mold rotation Breaking strength improves about 16%；After being wound using rotating die method sheath prepared by the circumgyration incision to pipe, heat up into Row test, it is observed that and test, disorientation occur while sheath protection materials are wrapped up it is closer；Combustion testing, from fire Extinguish immediately.

Above-listed detailed description is illustrating for the utility model possible embodiments, and the embodiment is not to limit The scope of the patents of the utility model, all equivalence enforcements or change without departing from carried out by the utility model, is intended to be limited solely by this case In the scope of the patents.

Claims (1)

1. a kind of preparation facilities of high voltage direct current valve tower branch water pipe sheath, is used to prepare band-like protective covering of water pipe, including successively Extruder, cooling and shaping mechanism, the dragger, rotary knife cutter of connection, the front end of the extruder are provided with tube extruding machine head, institute It states tube extruding machine head to include handpiece body and be set to the intracorporal rotating die device of head, the rotating die device includes support Body squeezes nozzle mould, bearing, and the supporter is provided with ladder hole along axial direction, inside lays a bearing, the crowded nozzle mould by The bearing support, the front end of the mouth mold are equipped with driving wheel, and the driving wheel is connect with a driving mechanism, driving wheel rotation When, the crowded nozzle mould and handpiece body form dynamic cooperation, it is characterised in that: the rotary knife cutter includes a pedestal, the bottom It is provided with guide pipe between the two sidewalls of seat, the protecting pipe stretched out from the extruder is arranged in the guide pipe, and extends to The outside of end side wall is provided with cutter, the Pivot axle of the cutter and the guiding outside the end side wall The central axis of pipe in the same horizontal line, is also equipped with a motor, the work of cutter described in the motor driven on the pedestal.